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WO2000048840A1 - Dispositif de formation d'images - Google Patents

Dispositif de formation d'images Download PDF

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Publication number
WO2000048840A1
WO2000048840A1 PCT/JP2000/000910 JP0000910W WO0048840A1 WO 2000048840 A1 WO2000048840 A1 WO 2000048840A1 JP 0000910 W JP0000910 W JP 0000910W WO 0048840 A1 WO0048840 A1 WO 0048840A1
Authority
WO
WIPO (PCT)
Prior art keywords
toner
image signal
image
voltage
forming apparatus
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/JP2000/000910
Other languages
English (en)
Japanese (ja)
Other versions
WO2000048840A8 (fr
Inventor
Taichi Ito
Akira Kumon
Katsutoshi Ogawa
Akira Fukano
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Panasonic Holdings Corp
Array Printers AB
Original Assignee
Matsushita Electric Industrial Co Ltd
Array Printers AB
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority claimed from JP11038373A external-priority patent/JP2000233526A/ja
Priority claimed from JP11167711A external-priority patent/JP2000355116A/ja
Application filed by Matsushita Electric Industrial Co Ltd, Array Printers AB filed Critical Matsushita Electric Industrial Co Ltd
Priority to AU25733/00A priority Critical patent/AU2573300A/en
Publication of WO2000048840A1 publication Critical patent/WO2000048840A1/fr
Publication of WO2000048840A8 publication Critical patent/WO2000048840A8/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
    • B41J2/00—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed
    • B41J2/385—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by selective supply of electric current or selective application of magnetism to a printing or impression-transfer material
    • B41J2/41—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by selective supply of electric current or selective application of magnetism to a printing or impression-transfer material for electrostatic printing
    • B41J2/415—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by selective supply of electric current or selective application of magnetism to a printing or impression-transfer material for electrostatic printing by passing charged particles through a hole or a slit
    • B41J2/4155—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by selective supply of electric current or selective application of magnetism to a printing or impression-transfer material for electrostatic printing by passing charged particles through a hole or a slit for direct electrostatic printing [DEP]

Definitions

  • the present invention relates to an image forming apparatus applied to a copying machine, a facsimile, a pudding machine, and the like.
  • a toner passage control unit controlled by an image signal controls flying of toner from a toner carrier to a back electrode.
  • the present invention relates to an image forming apparatus for forming an image by attaching toner to an image receiving means located between a toner passage control means and a back electrode.
  • toner is caused to fly onto an image receiving means such as a recording paper or an intermediate image carrying belt by the action of an electric field to form an image.
  • image receiving means such as a recording paper or an intermediate image carrying belt by the action of an electric field to form an image.
  • Examples of such an image forming apparatus include Japanese Patent Publication No. 441-26333 and U.S. Pat. No. 3,689,935 (Japanese Patent Publication No. 60-207747). And Japanese Unexamined Patent Application Publication No. Hei 9-150842 are known. As an example, what is disclosed in Japanese Patent Application No. 10-107080 will be described with reference to FIG.
  • reference numeral 31 denotes a grounded toner carrier that carries and transports charged toner
  • 32 denotes a regulating blade, and controls the toner on the toner carrier 31 to one to three layers. It is further charged.
  • 33 is a supply roller for supplying toner to the toner carrier 31 and charging the toner.
  • 3 4 is a toner passage control means, which forms a toner passage hole 3 5
  • a control electrode 36 is provided around it. A voltage corresponding to an image signal is applied to the control electrode 36 from a control power supply 37.
  • 38 is a back electrode
  • 39 is a back electrode power supply.
  • Reference numeral 40 denotes an image receiving means such as a recording paper conveyed on the back electrode 38.
  • the supply roller 33 and the toner carrier 31 are operated so that a uniform toner layer is formed on the toner carrier 31 by the regulating blade 32 to be conveyed.
  • a voltage is applied to the back electrode 38, and a voltage corresponding to the image signal is applied to the control electrode 36 by a control power source 37 such as a drive IC in synchronization with the movement while moving the image receiving means 40.
  • the toner on the toner carrier 31 passes through the toner passage hole 35 and adheres to the image receiving means 40 according to the image signal, and a required image is formed on the image receiving means 40.
  • the toner passing control means 34 requires the toner passing control means 34 to pass the toner at such a pitch.
  • Holes 35 must be provided, and cannot be arranged in a single row. Therefore, as shown in FIG. 21, a large number of rows (eight rows in the example shown) of toner passing holes 35 and control electrodes 36 are arranged. .
  • the toner passage holes 35 and the control electrodes 36 are circular, and connection electrodes that are electrically connected to the control electrodes 36 are provided on both sides in the moving direction of the toner carrier 31 to avoid mutual interference. Is connected to the lead of the drive IC that outputs
  • deflection electrodes 41a and 41b different from the control electrode 36 are arranged as shown in FIG. 19B to deflect the trajectory of the toner to the left and right, so that a plurality of dots are formed in one toner passage hole 35.
  • deflection electrodes 41a and 41b different from the control electrode 36 are arranged as shown in FIG. 19B to deflect the trajectory of the toner to the left and right, so that a plurality of dots are formed in one toner passage hole 35.
  • a pair of deflection electrodes 41a, 4 lb As shown in FIG. 20B, a state in which a voltage is applied to only one of the deflection electrodes 41a, a state in which a voltage is not applied to any of the deflection electrodes 41a and 41b, and a state in which the other By sequentially switching to a state in which only 41b is applied with a voltage, the flying position of the toner is selected from any of 42a, 42b, and 42c. Note that the deflection electrodes 41a and 41b move the image receiving means 40 while sequentially switching the voltage application timing, and as shown in FIG.
  • the toner receiving holes 35 are moved so as to compensate for the movement amount.
  • the voltage is applied to the electrode 41a or 41b first.
  • the arrangement pitch P of the toner passage holes 35 is 254 m, and the toner passage
  • FIG. 18 shows an example of a configuration in which the image receiving means 40 is made of recording paper or the like and an image is formed directly on the recording paper or the like.
  • the recording paper or the like varies in thickness, changes in properties due to humidity, In the case of color printing, there are problems such as difficulty in synchronizing the image formation timing of each color due to variations in recording paper conveyance, and image quality is likely to deteriorate.
  • an intermediate image carrying pelt is used as the image receiving means 40, and the images formed on the image carrying belt are collectively In some cases, it is preferable to transfer the image to recording paper or the like.
  • reference numeral 43 denotes an endless image-bearing belt as the image receiving means 40, which is a film having a resistance of about 101 () ⁇ cm in which a conductive filler is dispersed in a resin. It is wound between a pair of rollers 44a and 44b.
  • 4 5 is a pickup roller for feeding the recording paper 46 one by one from the paper feed tray
  • 47 is a timing roller for synchronizing the fed recording paper 46 with the image position
  • 48 is on the image carrying belt 43.
  • a transfer roller for transferring the toner image formed on the recording paper 46 to the recording paper 46. The transfer roller is pressed toward the opening roller 44a with the image carrying belt 43 interposed therebetween, and a transfer voltage is applied.
  • a fixing device 49 fixes the toner image on the recording paper 46 by heating and pressing the recording paper 46 on which the toner image has been transferred.
  • the distance between the toner carrier 31 and the toner passage holes 35 changes between the rows.
  • a difference may occur in the amount of applied toner with respect to No. 6 and the image quality may be reduced.
  • toner flies from the toner passage holes of interest from adjacent toner passage holes on the same row at the same time, mutual interference occurs between adjacent electric fields, increasing the strength of the electric fields.
  • the direction of the electric field relatively changes from the center of the toner passage hole to the outside in the radial direction.
  • the size of the surrounding pixels is set to a size that provides sufficient density in the evening recording. Then, there is a problem that the area of the white portion becomes small and characters and lines become unclear.
  • the present invention solves the problems specific to an image forming apparatus that forms a pixel by causing toner to fly by an electric field, and secures sufficient image quality and recording speed.
  • An object is to provide an image forming apparatus having a simple and inexpensive image signal processing circuit section. Disclosure of the invention The present invention has taken the following measures in order to solve the above problems.
  • the invention according to claim 1 provides a toner carrier that carries charged toner and moves, a plurality of toner passage holes arranged in a row through which the toner conveyed to the toner carrier passes, and the toner.
  • a toner passage control unit having a control electrode disposed in the vicinity of the passage hole on the insulating substrate, an image signal processing unit for applying a voltage according to an image signal to the toner passage control unit, and a toner passage control unit
  • An image receiving unit to which toner is applied, and a back electrode disposed on the back of the image receiving unit for sucking toner are provided.
  • the image signal is supplied from a toner carrier by applying an image signal voltage corresponding to an image signal to a control electrode.
  • An image forming apparatus for applying toner to an image receiving means through a toner passage hole, wherein the image signal processing means controls an application time of an image signal voltage applied to the control electrode by applying a pulse voltage to the control electrode.
  • a configuration is adopted in which the number of applications is varied by changing the number of applications.
  • the invention according to claim 2 is the invention according to claim 1, wherein the image signal voltage comprises a plurality of pulse voltages corresponding to the gradation of the image signal, and the number of pulse voltages is changed according to the gradation of the image signal.
  • the image signal voltage comprises a plurality of pulse voltages corresponding to the gradation of the image signal, and the number of pulse voltages is changed according to the gradation of the image signal.
  • the image signal voltage comprises a plurality of pulse voltages corresponding to the gradation of the image signal, and the image to which the correction for changing the gradation of the image signal is added.
  • a configuration is adopted in which the number of pulse voltages is changed according to the signal, and the application time of the image signal voltage is varied.
  • the gradation of the image signal corresponding to the toner passage hole corresponding to the corresponding toner passage hole is determined by the image signal processing means depending on the condition.
  • the correction value can be set freely for each pixel, which is effective in improving image quality and simplifying the circuit configuration.
  • a toner carrier that carries charged toner and moves, a plurality of toner passage holes arranged in a row through which the toner conveyed to the toner carrier passes, and the toner.
  • a toner passage control means having a control electrode disposed in the vicinity of the passage hole on an insulating substrate, an image signal processing means for applying a voltage corresponding to an image signal to the toner passage control means, An image receiving unit to which the toner that has passed through the toner passage control unit is applied; and a back electrode disposed on a back surface of the image receiving unit for sucking the toner, and applying an image signal voltage corresponding to the image signal to the control electrode.
  • An image forming apparatus for applying toner supplied from the toner carrier to the image receiving means through the toner passage hole, wherein the image signal processing means controls the application time of the image signal voltage applied to the control electrode to the control electrode.
  • a configuration is adopted in which the pulse width is varied by changing the pulse width of the applied pulse-like voltage.
  • the application time of the image signal voltage is simultaneously recorded with respect to various fluctuation factors that act uniformly on a plurality of toner passage holes belonging to the same toner passage hole row.
  • the correction can be made by changing the pulse width for the column at a time, improving the recording speed and simplifying the circuit configuration.
  • An image forming apparatus for applying toner supplied from a toner carrier to an image receiving means through a toner passage hole, wherein the image signal voltage comprises a plurality of pulse voltages corresponding to the gradation of the image signal.
  • the image signal voltage comprises a plurality of pulse voltages corresponding to the gradation of the image signal.
  • a toner carrier which carries charged toner and moves, and a plurality of toner passage holes arranged in a row through which the toner conveyed to the toner carrier passes.
  • a toner passage control unit having, on an insulating substrate, a control electrode disposed in the vicinity of the toner passage hole; an image signal processing unit for applying a voltage to the toner passage control unit in accordance with an image signal; and passing through the toner passage control unit Image receiving means to which the applied toner is applied, and a back electrode disposed on the back of the image receiving means for sucking the toner, wherein the control electrode has an image signal corresponding to the image signal.
  • An image forming apparatus for applying a voltage to apply toner supplied from a toner carrier to an image receiving unit through a toner passage hole, wherein an image signal voltage includes a plurality of pulses corresponding to a gradation of an image signal.
  • the number of pulse voltages is changed according to the image signal that has been corrected to change the gradation of the image signal, and the pulse width of the pulse voltage is changed.
  • the invention according to claim 7 is the invention according to any one of claims 4 to 6, wherein the pulse width of the pulse voltage is controlled by a plurality of control electrodes corresponding to a plurality of toner passage holes that simultaneously fly the toner. Adopts an equivalent configuration.
  • an image signal corresponding to a toner passage hole of interest is subjected to correction for changing the gradation for each pixel.
  • the correction method that is used individually for each pixel and the correction method that changes the application time of the pulse voltage corresponding to each gradation of the image signal at the same time for the row of toner passage holes that are used collectively are used depending on the correction target. As a result, it is possible to prevent an increase in circuit cost, to secure necessary image quality, and to improve recording speed.
  • the image signal voltage application time is simultaneously changed by changing the pulse width. It is possible to change the row of passage holes collectively and make necessary and sufficient corrections, thereby improving the recording speed and simplifying the circuit configuration.
  • the invention according to claim 8 is the invention according to any one of claims 2, 3, 5, and 6, wherein the number of gradations of the image signal after changing the gradation of the image signal is the gradation of the image signal.
  • a configuration is adopted in which the number of tones is greater than the number of tones of the image signal before the tone is changed.
  • the image signal voltage comprises a plurality of pulse voltages corresponding to gradations of the image signal.
  • the pulse voltage is applied continuously without off-time.
  • a pulse voltage corresponding to the gradation of the image signal can be continuously applied to the control electrode, and the recording time can be reduced as compared with a case where a pause time (off time) is provided between each pulse voltage. Can be reduced.
  • an image signal corresponding to the toner passage hole is changed according to the presence or absence of toner flying from a plurality of toner passage holes arranged adjacent to the toner passage hole.
  • the correction that changes the gradation of the image signal corresponding to the toner passage hole of interest according to the presence or absence of the toner passage from the adjacent toner passage hole, that is, the toner flight from the adjacent toner passage hole In some cases, a change is made to reduce the gradation, and if there is no toner flying from the adjacent toner passage hole, correction is performed so that the gradation is not changed, so that the adjacent toner passage hole is corrected. It is possible to solve the problem that the electric field condition around the toner passage hole varies depending on the presence or absence of the toner flying from the toner, and the size of the pixel fluctuates.
  • the invention according to claim 11 is the invention according to any one of claims 2, 3, 5, and 6, wherein the plurality of toner passage holes arranged in a line for simultaneously flying toner. In this configuration, an image signal corresponding to the toner passage hole is made different according to the accumulated number of pixels of the toner passage hole.
  • the invention according to claim 12 is the invention according to claim 5, wherein the image signal processing means transmits the image signals corresponding to the plurality of toner passage holes arranged in a row for simultaneously flying the toner. And a first image storage means for storing and holding along the array.
  • the invention according to claim 13 is the invention according to claim 12, wherein the insulating substrate includes a plurality of rows of a plurality of toner passage holes arranged in a row, and the image signal processing means is a first image storage means.
  • a configuration is adopted in which the number of steps is equal to or greater than the number of rows of the toner passage holes.
  • the invention according to claim 14 is the invention according to claim 12, further comprising second image storage means for storing an image signal along an array of pixels formed in the image receiving means, wherein the second image storage means An arbitrary image signal is selected from the image signals stored in the first image storage unit and transferred to the first image storage unit.
  • the insulating substrate includes a deflection electrode disposed in the vicinity of the through-hole for the toner, and the deflection electrode is multistage in synchronization with the image signal voltage.
  • the direction in which the toner passing through the toner passage hole flies is changed by applying a deflecting voltage that fluctuates in the same direction, and the transfer of the image signal from the second image storage unit to the first image storage unit is performed in a different direction.
  • a configuration is adopted in which the toner jump is performed every time.
  • the image signal processing for the toner flying in different directions is repeated by using the same image signal processing means by switching the application condition of the changed voltage, so that the image signal is stored in the image signal processing means.
  • the circuit configuration can be simplified.
  • the invention according to claim 16 is the invention according to any one of claims 1 to 6, wherein the image signal processing means includes power saving means, and the counting means is a predetermined timer.
  • a configuration is adopted in which the pulse width of the pulse voltage is determined by counting up to the number. With this configuration, the pulse width (application time) of the image signal voltage can be arbitrarily set with a simple circuit configuration.
  • the image signal processing means employs a configuration in which a pulse width of a pulse voltage is changed.
  • the invention according to claim 18 is the invention according to claim 5, wherein the image signal processing means includes a storage means in which a plurality of predetermined constants are stored, and selectively uses the plurality of constants to reduce a pulse voltage. A configuration is adopted in which the pulse width is determined.
  • the pulse width (application time) of the image signal voltage can be arbitrarily set with a simple circuit configuration and can be changed according to conditions.
  • the invention according to claim 19 is the invention according to any one of claims 1 to 6, wherein the pulse width of the noise voltage is varied according to the gradation according to the gradation of the image signal. Adopted configuration.
  • the voltage application time can be set independently according to the gradation to be recorded. Therefore, density modulation with good gradation (for example, linearity) based on the density characteristics in the pixel forming process accompanying the toner flight Density modulation).
  • the invention according to claim 20 adopts a configuration according to the invention according to claim 18, wherein the constant is changed according to the gradation of the image signal, and the pulse width of the pulse voltage is changed according to the gradation. .
  • the pulse width (application time) of the pulse voltage corresponding to the gradation of the image signal can be arbitrarily set and changed according to the conditions. Can be easily realized.
  • the invention according to claim 21 is the invention according to claim 18, wherein the image forming apparatus is operated.
  • the user selects an arbitrary constant number from the plurality of constants stored in the storage means in accordance with the purpose.
  • the voltage application time can be set independently according to the gradation to be recorded, so that density modulation with good gradation can be performed based on the density characteristics in the pixel forming process.
  • printing can be performed by arbitrarily selecting the density modulation condition according to the application or preference from several types of setting conditions stored in advance.
  • the insulating substrate includes a plurality of rows of a plurality of toner passage holes arranged in a row, and the plurality of rows correspond to the rows of the toner passage holes that perform toner flying.
  • the pulse width of the pulse voltage is made different according to the row of toner passage holes for toner flight.
  • the problem can be solved by making the width of the contact width different depending on the row of the through hole where the recording is performed.
  • the invention according to claim 23 is the invention according to claim 18, wherein the insulating substrate is provided with a deflection electrode disposed near the toner passage hole, and the deflection electrode fluctuates in multiple stages in synchronization with an image signal voltage.
  • the deflection direction of the toner passing through the toner passage hole is changed by applying a deflection voltage, and the constant is changed according to the deflection direction accompanying the toner flight, so that the pulse width of the pulse voltage is deflected by the toner flight.
  • the configuration is made different depending on the direction.
  • a twenty-fourth aspect of the present invention is the invention according to the eighteenth aspect, wherein the constant is changed according to the temperature inside the image forming apparatus, and the pulse width of the pulse voltage is made different according to the temperature.
  • the constant that enables the image forming apparatus to reproduce good characteristics under various environmental conditions is determined by the temperature or humidity conditions.
  • the ambient temperature or humidity is detected by the image forming apparatus, and the constant is changed according to the condition, thereby preventing a change in the recording characteristics due to a change in the environmental condition.
  • the constant is changed according to the cumulative number of prints inside the image forming apparatus, and the pulse width of the less voltage is changed according to the cumulative number of prints.
  • the configuration adopted is as follows.
  • the invention according to claim 26 is characterized in that the toner carrier which carries the charged toner and moves, and a plurality of toner passage holes arranged in a row through which the toner conveyed to the toner carrier passes, and a toner carrier.
  • a toner passage control unit having a control electrode disposed in the vicinity of the one passage hole on an insulating substrate; an image signal processing unit for applying a voltage to the toner passage control unit in accordance with an image signal; and a toner passage control unit.
  • An image forming apparatus for applying supplied toner to an image receiving means through a toner passage hole, wherein the image signal processing means holds a first image signal supplied to the toner passage hole for toner flight.
  • a second counting means for supplying a latch signal to the latch means, and a storage means for storing a constant given to the second counting means.
  • an image signal corresponding to a toner passage hole of interest is corrected for each pixel by changing its gradation.
  • the correction method that changes the application time of the pulse voltage corresponding to each gradation of the image signal collectively for the row of toner passage holes that record simultaneously. Accordingly, it is possible to prevent an increase in circuit cost, and to improve image quality and recording speed.
  • the invention according to claim 27 is the invention according to claim 26, wherein the comparison result relating to non-printing is compared with the comparison result during the time when the pulse voltage corresponding to the highest gradation of the image signal is applied to the control electrode. From the shift register.
  • An invention according to claim 28 is a control electrode that has a toner carrier that carries and moves the charged toner and a plurality of toner passage holes that allow the toner to pass therethrough and is disposed so as to surround the periphery thereof.
  • a toner passage control means for applying a pulse voltage according to the image signal to control the passage of toner, and an image signal processing means for supplying a pulse voltage according to the image signal to the toner passage control means
  • an image forming apparatus having an image receiving means to which the toner passed therethrough is provided, and a back electrode provided on the back of the image receiving means for sucking toner.
  • a plurality of rows in which a number of toner passage holes are arranged in a direction perpendicular to the moving direction are provided at appropriate pitch intervals, and the amount of toner flying from the toner passage holes on the lower row is related to the toner passage holes. That due to the image signal, the downstream side of the toner passage hole to the upstream side of the column adjacent to each other in a direction parallel to the columns
  • the configuration is characterized in that it is constant irrespective of the image signal corresponding to the toner passage hole.
  • This configuration prevents the problem that the amount of toner flying from the toner passage hole on the lower side becomes constant regardless of the amount of toner flying from the adjacent toner passage hole on the upper side, and the dot diameter becomes uneven. Thus, good character quality can be realized.
  • the invention according to claim 29 is characterized in that a toner carrier that carries and moves the charged toner, and a control electrode that has a plurality of toner passage holes through which the toner passes and is disposed so as to surround the periphery thereof.
  • a toner passage control unit that controls the passage of toner by applying a pulse voltage according to an image signal
  • an image signal processing unit that supplies a pulse voltage according to the image signal to the toner passage control unit
  • the toner passage control means includes: a moving direction of the toner carrier; A plurality of rows in which a large number of toner passage holes are arranged in a direction orthogonal to each other are provided at appropriate pitch intervals, and the image signal processing means is configured to control the potential or voltage of the voltage applied to the control electrode on the lower row. The application time is made different for each control electrode in accordance with an image signal corresponding
  • the amount of toner flying from the lower toner passage hole is controlled in accordance with the image signal corresponding to the adjacent upper toner passage hole, and the amount of toner flying from the upper toner passage hole is controlled in accordance with the image signal.
  • the amount of toner flying is the amount of toner flying from the adjacent upper toner passage hole or the amount of toner flying from the lower toner passage hole when there is no toner flying from the adjacent upper toner passage hole. It is possible to prevent the problem that the dot diameter becomes non-uniform, and to achieve good character quality.
  • the invention according to claim 30 is the image forming apparatus according to claim 29, wherein the toner passage control means has a large number of toner passage holes arranged in a direction orthogonal to the moving direction of the toner carrier.
  • the rows are arranged in a staggered manner so that the toner passage holes are arranged in a staggered manner.
  • the image signal processing means is provided on the control electrodes on the lower rows in the moving direction of the toner carrier.
  • the amount of toner flying from the lower toner passage hole is controlled in accordance with the image signal corresponding to the adjacent upper toner passage hole, whereby the image signal is output from the upper toner passage hole.
  • the flying amount of the toner from the passage hole is the amount of toner flying from the toner passage hole on the upper side, and from the toner passage hole on the lower side when no toner is flying from the toner passage hole on the upper side. It is possible to prevent the problem that the dot diameter becomes non-uniform due to a decrease in the toner amount compared with the toner amount, and to achieve good character quality.
  • the invention according to claim 31 is characterized in that a toner carrier that carries and moves the charged toner, and a control electrode that has a plurality of toner passage holes through which the toner passes and that is arranged so as to surround the periphery thereof.
  • a toner passage control unit that controls the passage of toner by applying a pulse voltage according to a signal; an image signal processing unit that supplies a pulse voltage according to the image signal to the toner passage control unit;
  • the amount of the toner flying from the toner passage hole is It is characterized by being constant irrespective of an image signal corresponding to pixels surrounding pixels formed in the image receiving means from the toner passage hole due to an image signal related to the passage hole.
  • the flying amount of the toner from the focused toner passage hole becomes constant regardless of the flying amount of the toner from the toner passage hole corresponding to the pixel around the pixel formed on the image receiving means by the toner passage hole.
  • the invention according to claim 32 is a toner carrier that carries and moves the charged toner,
  • a toner passage control means having a plurality of toner passage holes through which the toner passes and applying a pulse-like voltage according to an image signal to a control electrode disposed so as to surround the toner passage hole;
  • Image signal processing means for supplying a pulsed voltage corresponding to the image signal to the toner passage control means, an image receiving means to which the passed toner is applied, and a toner disposed on the back of the image receiving means to transfer the toner.
  • the image signal processing means forms the potential of the voltage applied to the control electrode or the voltage application time on the image receiving means by applying the voltage by the control electrode.
  • a configuration is adopted in which the control electrode is made different for each control electrode according to an image signal corresponding to a pixel surrounding the pixel.
  • the dot diameter can be made uniform irrespective of the surrounding image pattern, and good character quality can be realized.
  • the image signal processing means adjusts a potential of the voltage applied to the control electrode or a voltage application time to the voltage applied to the control electrode simultaneously.
  • a configuration is adopted in which different control electrodes are used in accordance with image signals corresponding to at least one arranged control electrode.
  • the image signal processing means determines whether a potential or a voltage application time of a voltage applied to the control electrode is at least one of a value at which the control electrode has been applied.
  • a configuration is adopted in which each control electrode is varied in accordance with an image signal corresponding to a pixel formed on the image receiving means in a line.
  • the invention according to claim 35 is the image forming apparatus according to claim 32, wherein the image signal processing
  • the control means controls a potential of a voltage applied to the control electrode or a voltage application time in accordance with an image signal corresponding to a pixel formed on the image receiving means in at least one line in the past and in the future by the control electrode.
  • a configuration characterized in that it is different every time is adopted. With this configuration, even when white characters are recorded in the background or white lines are recorded, white characters and white lines can be recorded more clearly.
  • the image signal processing means adjusts a potential or a voltage application time of a voltage applied to the control electrode on the image receiving means.
  • a potential or a voltage application time of a voltage applied to the control electrode on the image receiving means In accordance with an image signal corresponding to at least one pixel arranged in a predetermined manner, and an image signal corresponding to a pixel formed on the image receiving means in at least one past and future line by the control electrode.
  • Adopt a configuration characterized by differentiating.
  • This configuration prevents white pixels from being reduced not only in the sub-scanning direction but also in the main scanning direction when white characters or white lines are recorded in the background. Can be recorded more clearly.
  • the image signal processing means adjusts the potential of the voltage applied to the control electrode or the voltage application time simultaneously with the control electrode.
  • a configuration is adopted in which the control electrode is made different for each control electrode in accordance with an image signal corresponding to a pixel formed in the image receiving means in at least one future line.
  • the invention according to claim 38 is the image forming apparatus according to claim 32, wherein the image signal processing
  • the means includes: controlling a potential of a voltage applied to the control electrode or a voltage application time to an image signal corresponding to at least one adjacent control electrode for applying the voltage at the same time as the control electrode; An image signal corresponding to at least one pixel arranged adjacently on the means, an image signal corresponding to a pixel formed by the control electrode in the image receiving means in at least one past and future line, and A control electrode on which at least one pixel arranged adjacent to the image receiving means is recorded is controlled in accordance with an image signal corresponding to a pixel formed on the image receiving means in at least one line in the past and in the future.
  • a configuration characterized in that it is different for each electrode is adopted.
  • the dot diameter can be reduced even when mutual interference occurs between adjacent electric fields due to simultaneous toner flying from adjacent toner passing holes on the same row with respect to the toner passing hole of interest. This makes it possible to achieve good character quality and to record white characters and white lines clearly even when recording white characters or white lines in the background. it can.
  • the invention according to claim 39 is the invention according to any one of claims 29, 31, and 32, wherein a voltage applied to the control electrode is adjusted according to a gradation of an image signal.
  • a configuration is adopted in which the potential or voltage application time is varied.
  • FIG. 1 is a side sectional view of a main part of an embodiment of the image forming apparatus of the present invention
  • FIG. 2 is a plan view showing an arrangement state of control electrodes
  • FIG. 2A is a plan view showing an arrangement state of deflection electrodes
  • FIG. 2B is a plan view showing an arrangement state of deflection electrodes in Embodiment A of the present invention.
  • FIG. 3 is a system block diagram of the embodiment of the present invention.
  • FIG. 4 is a timing chart showing states of voltages applied to the control electrode and the deflection electrode according to the embodiment A.
  • FIGS. 5A, 5B, and 5C are operation explanatory diagrams showing a flying state of toner in the embodiment.
  • FIG. 6 is an explanatory diagram showing a state of a pixel formed on an image receiving unit in the embodiment
  • FIG. 7 is a block diagram showing details of a control system of the embodiment.
  • FIG. 8 is a flowchart showing the operation of the control system in the embodiment.
  • FIG. 9 is a timing chart of various data and signals of the control system according to the embodiment.
  • FIG. 10 is a configuration diagram of an image storage unit in the embodiment.
  • FIG. 11 is a partial detailed view of the image signal processing means in the embodiment.
  • FIG. 12 shows an arrangement state of each electrode in the embodiment B of the present invention
  • FIG. 12A shows a plan view showing an arrangement state of control electrodes
  • FIG. 12B shows an arrangement state of a deflection electrode.
  • FIG. 13 is a timing chart showing states of voltages applied to the control electrode and the deflection electrode in the same embodiment
  • FIG. 14 is an explanatory diagram of the operation of the image forming apparatus according to the embodiment.
  • FIG. 14A is a plan view when an image is formed at the positions of the m-line and the m ⁇ 1 line
  • FIG. FIG. 4 is a plan view when an image is formed at the positions of one line and m line
  • FIG. 15 is an operation explanatory diagram of the image forming apparatus according to the embodiment.
  • FIG. 16 is an explanatory diagram of the operation of the image forming apparatus according to Embodiment C of the present invention.
  • FIG. 17 is an operation explanatory diagram for changing the voltage application time of the voltage applied to the control electrode of the toner passage hole of interest.
  • FIG. 18 is a configuration diagram of a conventional image forming apparatus.
  • FIG. 19 shows the arrangement of the electrodes in the conventional example
  • FIG. 19A is a plan view showing the arrangement of the control electrodes
  • FIG. 19B is a plan view showing the arrangement of the deflection electrodes.
  • FIG. 20 shows three operation states in an arbitrary toner passage hole of the conventional example, FIG. 20 is a vertical front view, and FIG. 20B is a vertical side view.
  • FIG. 21 is a configuration diagram showing the overall configuration of another conventional image forming apparatus.
  • FIG. 22 is a configuration diagram showing the overall configuration of another conventional image forming apparatus. BEST MODE FOR CARRYING OUT THE INVENTION
  • FIG. 1 is a side sectional view showing a configuration of an embodiment of an image forming apparatus according to the present invention.
  • FIGS. 2 and 12 are enlarged views of an electrode portion of each embodiment in a plane direction
  • FIG. 3 is a control block. It is a figure.
  • reference numeral 1 denotes a toner carrier that carries and conveys charged toner 2 and is composed of a grounded rotatable sleeve. 2 is adsorbed in one to three layers.
  • Reference numeral 3 denotes a toner passage control means, which is composed of a flexible printed circuit board having an effective width corresponding to the effective width of the toner carrier 1 and, as shown in FIG. 2, in a direction orthogonal to the moving direction of the toner carrier 1.
  • a large number of toner passage holes 4 are formed in rows at a predetermined pitch interval, and the rows 5 a and 5 b of the toner passage holes 4 are formed in two rows in the moving direction of the toner carrier 1. .
  • the toner passage holes 4 are arranged in a staggered manner between the rows 5a and 5b, and the toner passage holes 4 in each of the rows 5a and 5b have a pitch of 254 m in the main scanning direction.
  • the toner passage holes are formed at 100 dpi) and have a density of 127 zm pitch (200 di) in the main scanning direction in rows 5a and 5b.
  • the distance P between the rows 5a and 5b of the toner passage holes 4 is equal to an integral multiple of the printable pixel pitch in the sub-scanning direction.
  • the image forming apparatus according to the present embodiment has a printable resolution of 600 and a column distance P of 127 ⁇ m, which is three times the pixel pitch of 42.3 m.
  • Reference numeral 6 denotes a back electrode disposed to face the toner carrier 1 with the toner passage control means 3 interposed therebetween.
  • Reference numeral 7 denotes a fixed path between the back electrode 6 and the toner passage control means 3.
  • Image receiving means such as a recording paper or an image carrying belt to which the image is conveyed.
  • the upper side With respect to a vertical line lowered from the center of the toner carrier 1 to the back electrode 6, the upper side is located at a distance of about 300 to 500 A row 5a of toner passage holes 4 is provided, and a row 5b of toner passage holes 4 on the lower side is provided at a position 127 m below. As shown in FIG.
  • the toner passage control means 3 includes a main film 8 having a thickness of about 50 m and adhesive layers having a thickness of about 10 to 15 ⁇ m on both sides thereof. It is composed of a three-layer polyimide resin film consisting of upper and lower cover films 9 having a thickness of about 0 mm.
  • a main film 8 having a thickness of about 50 m and adhesive layers having a thickness of about 10 to 15 ⁇ m on both sides thereof. It is composed of a three-layer polyimide resin film consisting of upper and lower cover films 9 having a thickness of about 0 mm.
  • the material and dimensions of each film, the number of constituent layers, and the like are not limited thereto, and may be arbitrarily designed.
  • reference numeral 14 denotes an image signal storage unit which stores an image signal corresponding to each pixel.
  • 15 is a power supply means.
  • a $ IJ control electrode 10 is arranged on the upper surface of the main film 8 so as to surround the toner passage hole 4, and the lower surface of the main film 8 is the same as that of FIG. 2A.
  • a pair of deflection electrodes 11a and 11b are arranged so as to surround the toner passage hole 4 from both sides.
  • These electrodes 10, 11 a, and 11 b are composed of a Cu film having a thickness of about 8 to 20 / m, which is patterned on the main film 8.
  • the pair of deflection electrodes 11a and 1lb are at an angle (9, i.e. 18.4 °) where tan 0 is 1/3 of the center line of the rows 5a and 5 of the toner passage holes 4. It is arranged so as to face the inclined direction.
  • each toner passage hole 4 is formed by a long hole in which the length L in the moving direction of the toner carrier 1 is larger than the width W in the direction orthogonal to the direction.
  • the length L is set to about 10 and the width W is set to about 70 to 80 ⁇ m.
  • the width of the control electrode 10 around the toner passage hole 4 is set such that the width t l in the long direction of the toner passage hole 4 is larger than the width t 2 in the short diameter direction.
  • the control electrode 10 and its driving IC are connected to the row 5 a of the toner passage hole 4 on the upper side in the moving direction of the toner carrier 1 with the connection electrode 12 a extended to the upper side, and similarly on the lower side.
  • the row 5b of the through hole 4 is connected by a connection electrode 12b extending to the lower side.
  • the deflection electrodes 11a and 11b and the driving ICs thereof are arranged such that the deflection electrodes 11a on one side of the toner passage hole 4 are arranged in both rows 5a and 5b.
  • the deflecting electrodes 11a are connected to each other, and the connecting electrodes extended to the upper side in the moving direction of the toner carrier 1.
  • the deflection electrodes 11b on both sides 5a and 5b were connected to each other with respect to the deflection electrode 11b on the other side and extended to the lower side in the moving direction of the toner carrier 1. They are connected by connection electrodes 13b.
  • reference numeral 14 denotes an image signal storage unit which stores an image signal corresponding to each pixel.
  • Reference numeral 15 denotes a power supply means, and an applied voltage Vp to each control electrode 10 is, for example, between-50 V, 200 V, and 250 V, and an applied voltage VDD to the deflection electrode 11 a and lib.
  • -L and VDD-R are switched in multiple steps from, for example, +200 V to -200 V, and the applied electrode to the back electrode 6 is set to, for example, 100 V. Supply voltage.
  • Reference numeral 16 denotes an image signal processing unit, which converts the voltage supplied from the power supply unit 15 into a pulse voltage derived from an image signal corresponding to each pixel stored in the image signal storage unit 14 and controls the control electrode 10 and the deflection. Applied to electrode 11 and back electrode 6.
  • FIG. 4 shows the state of the voltage applied to the control electrode 10 and the deflection electrodes 11a and 11b.
  • (A) shows the applied voltage Vp to each control electrode 10
  • (b) and (c) show the changes in the applied voltages VDD-L and VDD-R to the deflection electrodes 11a and 11b.
  • the control electrode 10 applies a different time T aC to each row of the toner passage holes 4 for each toner passage hole 4.
  • T aC By applying a voltage similar to the above up to T b C, the toner 12 is applied to the image receiving means 7 at a position facing the toner passing hole 4, as shown in FIG. 5B.
  • one toner passage hole 4 allows the toner to be placed on the image receiving means for a total of three points, two on the left and right and two on the center. Is given.
  • FIG. 6 shows an embodiment of the pixels formed on the image receiving means 7.
  • white circles indicate pixels formed on the image receiving means 7, and black circles indicate positions where the centers of the corresponding toner passage holes existed when the pixels were formed.
  • black circles indicate positions where the centers of the corresponding toner passage holes existed when the pixels were formed.
  • the image receiving means 7 is continuously conveyed at a constant speed in the sub-scanning direction Y even during the recording operation.
  • TaC Since the application of TaC ;, TaR, or TbL, TbC, and TbR is performed at a constant time period of T0 / 3, the center position of the toner passage hole at the time of toner flight is indicated by a black circle in FIG. As shown by, they are positioned at equal intervals ( ⁇ / 3, ⁇ : pixel pitch) in the sub-scanning direction.
  • the deflection electrodes 11a and 11b were inclined at an angle 0 at which t an0 became 1/3, that is, 18.4 ° with respect to the center line of the row 5a of the toner passage holes 4.
  • the toner 2 flying right and left from the toner passage hole 4 is It flies in the direction of the arrow shown in FIG. 6 which is inclined by 18.4 ° with respect to the center line of the row 5a of the toner passage holes 4 and the effect of the conveyance of the image receiving means 7 is canceled out.
  • the three pixels at the left, right, and center according to 4 are arranged in a straight line parallel to the main scanning direction.
  • the distance P between the rows 5a and 5b of the toner passage hole 4 is set to 127 / m, which is three times the pixel pitch in the sub-scanning direction. Simultaneous flight from the 4th column 5a and 5b can simultaneously form the m-line and m-3 line pixels, respectively.
  • FIG. 7 shows a detailed block diagram of the control system of the image forming apparatus according to the present embodiment.
  • the control system consists of the six components shown in Fig. 3, and the control electrodes are the control electrodes 10a and 10b corresponding to the toner passage holes in rows 5a and 5b, and the deflection electrode is 1 1a and 1 1b are each present.
  • the image signal processing means 16 is composed of two components corresponding to the control electrodes 1Oa and 1Ob, respectively, for processing and supplying the image signals.
  • the image signal storage means 14 stores an image signal composed of two bits of one frame which is color-separated for each of the colors yellow, magenta, cyan, and black.
  • the memory control circuit 16i simultaneously records from the image signal storage means 14 to the first and second line memories 16a and 16m, respectively, in the rows 5a and 5b of the toner passage holes 1
  • the image signals for 6 lines are transferred in cooperation with the print control circuit 16h.
  • the first and second line memories 16a and 16m hold image signals for one to six lines read from the image signal storage means 14.
  • the adjacent correction circuits 16b and 16n reduce the number of bits of the 1/6 line image signal transferred from the first and second line memories 16a and 16m from 2 bits to 3 bits. After the increase, the above-mentioned 1/6 line image signal is corrected for the number of gradations for each dot data according to the discrimination result of the adjacent discrimination circuit 16c, 16o, and the comparison is completed. , Send to 16 p.
  • the adjacency discriminating circuits 16c and 160 convert the image signals stored in the first and second line memories 16a and 16m into the adjacency correction circuits 16b and 16n.
  • the comparators 16d and 16p compare the 1 dot data for 1 line and 6 lines sent sequentially from the adjacent correction circuits 16b and 16 ⁇ with the number of gradations given by the gradation counters 16e and 16q and record or
  • the 1-bit print data (hereinafter referred to as “print data”) representing non-recording is sent to shift registers 16j and 16t.
  • the gradation counters 16e and 16q give gradation numbers from 0 to 7 to the comparators 16d and 16p under the control of the print control circuit 16h.
  • the gradation signals 16e and 16q are compared with the image signals for 1/6 line for one gradation at 16d and 16p, the number of gradations is increased by one. Evening 16 d, give to 16 p.
  • the comparator 16d is given a number of gradations from the gradation number 0 to the gradation number 7, and the image signal for 1/6 line is converted to the gradation number 0 at the comparison time 16d and 16p. Are compared with the number of tones from 7 to 7.
  • the latch counts 16 f and 16 r are programmable counts, and the application time of the image signal voltage to the control electrodes 10 a and 10 under various conditions pre-stored in the pulse table 16 g and 16 s Is counted based on the instruction of the print control circuit 16h, and a latch signal is output to the latch circuits 16k and 16u.
  • the print control circuit 16h includes a memory control circuit 16i, a gradation counter 16e, 16q, a latch counter 16f, 16r, a noise table 16g, 163, and deflection electrodes 11 &, 11b. Control.
  • the shift registers 16j and 16t input the print data sent from the comparators 16d and 16p in synchronization with the clock signal sent from the print control circuit 16h, and convert this to parallel data.
  • the latch circuits 16k and 16u hold the print data for 16 lines output by the shift registers 16j and 16t in response to the latch signals sent from the latch counters 16f and 16r.
  • the drive circuits 16 1 and 16 v apply the strobe signal sent from the print control circuit 16 h based on the 1/6 line print data held by the latch circuits 16 k and 16 v.
  • an image signal voltage corresponding to the print data is applied to the control electrodes 10a and 1Ob.
  • step (hereinafter referred to as ST) 1 the print control circuit 16h initializes the gradation counters 16e and 16q and the latch counters 16f and 16r.
  • step (ST2) the memory control circuit 16i transfers the image signal storage means 14 from the image signal storage means 14 to the first and second line memories 16a and 16m in accordance with the instruction of the print control circuit 16h. Transfer image signals.
  • the image signal storage means 14 stores image signals of one frame (NXM for each color) separated for each color of yellow, yellow, cyan, and black, and each image signal has 2 bits ( 4 tones), and can express four tones from 0 to 3.
  • the numbers assigned inside the image signal storage means 14 indicate the order in which pixels are recorded, and correspond to the order in which pixels are formed on the image receiving means 7 shown in FIG. If the m and m-3 lines are to be recorded in the rows 5a and 5b of the toner passage holes, respectively, first, the toner flies to the left from each toner passage hole in the m and m-3 lines. Image signals (image signals numbered 1) corresponding to the pixels are transferred to the first and second line memories 16a and 16m, respectively. The correspondence relationship between the image signals transferred into each of the line memories 16a and 16m and the coordinates in the image signal storage means 14 is shown.
  • the first line memory 16 a stores the image signal of one to six lines (hereinafter, referred to as “current line”) to be recorded at present, and stores the image signal in the adjacent correction circuit 16. send to b.
  • the adjacency correction circuit 16b receives the 1 transferred from the first line memory 16a.
  • the number of bits of the image signal of the / 6 line is increased from 2 bits to 3 bits so that gradation expression up to 8 gradations can be performed.
  • the adjacency discrimination circuit 16c compares the image signal stored in the first line memory 16a with the image signal stored in the adjacency correction circuit 16b, thereby obtaining the first line memory 16c.
  • image signal stored in a can preparative toner flies to determine whether the image signal with a, c adjacent the correction circuit 16 b sends the determination result to adjacent correction circuit 16 b from the adjacent toner passage holes adjacent
  • the number of gradations of the 1/6 line image signal is corrected every dot.
  • the print control circuit 16h transfers 1/6 line of image data one dot at a time from the adjacent correction circuit 16b to the comparator 16d.
  • the comparator 16d compares the image signal for 1/6 line sequentially sent from the adjacent correction circuit 16b with the gradation data "0" given from the gradation counter 16e.
  • the image signal is larger than the gradation data (image signal> gradation data)
  • one dot printing data "1" (record) is transferred to the shift register 16j '. I do.
  • the print data “0” (non-recording) is transferred to the shift register 16 in ST8. As shown in FIG. 9, the transfer of the print data is performed to the shift register 16j one bit at a time in synchronization with the clock signal from the print control circuit 16h.
  • the print control circuit 16h determines whether or not processing for 1/6 line has been completed. If not completed, return to ST6; otherwise, proceed to ST10.
  • the print data for 1/6 line is completed in the shift register 16j, the print data is converted from a serial signal to a parallel signal.
  • the print control circuit 16h determines whether or not the current processing is the 0th gradation.
  • the process proceeds to ST11.
  • the print control circuit 16h starts outputting a strike signal to the drive circuit 161 and then applies a deflection voltage to the deflection electrodes 1 la and 11b to deflect the toner to the left in ST13. I do.
  • the pulse table 16g outputs the pulse width value to the latch counter 16f according to the instruction of the print control circuit 16h.
  • the print control circuit 16h outputs an energization instruction signal to the latch counter 16f.
  • the latch counter 16f outputs a latch signal to the latch circuit 16k and starts counting from the pulse table 16g to the transferred pulse width timer value at the same time.
  • the latch circuit 16 k holds the print data converted in parallel based on the latch signal, and the held print data is sent to the drive circuit 16 1. Since the strobe signal is applied to the drive circuit 161, as described above, an image signal voltage corresponding to the print data is applied to the control electrode 10a, and the toner signal is applied in accordance with the image signal voltage. As the flight is performed, the light is deflected to the left by the deflection signal voltage applied to the deflection electrodes 1 la and 11 b.
  • the print control circuit 16 h determines whether or not the gradation count 16 e has been completed up to the highest gradation, based on whether the gradation data> the highest gradation is true or false. Since the processing has not been completed here, go to ST17. In ST17, the print control circuit 16h increments the number of gradations by one in the gradation counter 16e, and returns to ST6.
  • the processing from ST6 to ST10 is repeated as described above. However, since the processing is not the 0th gradation, the data from the image signal storage means 14 to the first line memory 16a is not stored.
  • the print control circuit 16h determines whether or not the latch counter 16f has finished counting.
  • a signal is sent to the print control circuit 16 h and the process proceeds to ST 14.
  • the pulse table 16g outputs a new pulse width timer value for the first gradation to the latch counter 16f according to the instruction of the print control circuit 16h.
  • the print control circuit 16h outputs an energization instruction signal to the latch counter 16f.
  • the latch counter 16 f outputs a latch signal to the latch circuit 16 k, and at the same time, adds a new count from the loose table 16 g to the transferred pulse width timer value.
  • a latch signal is input to the latch circuit 16k from the latch counter 16f
  • the new print data is latched after the latch circuit 16k is reset. This is the previous (0th gradation) image signal voltage application time.
  • the pulse table 16 g is preprogrammed with an appropriate pulse width value for each gradation and various printing conditions. Thereby, as shown in FIG. 9, it is possible to optimally set the image signal voltage application time from the 0th gradation to the 3rd gradation independently according to the characteristics of the image forming apparatus.
  • the recording of the m-3rd line by the row 5b of the toner passage holes is similarly performed.
  • an image signal voltage is given to each dot for one line of image data, and printing is performed for one line of image data. Complete. By completing this operation for all lines, yellow printing is performed. Furthermore, full color printing is performed by printing in three colors, magenta and cyan.
  • the pulse table 16 g contains image signal voltages to the control electrodes 10 a and 10 b corresponding to various conditions such as, for example, gradation, ambient temperature, toner deflection direction, and a row of toner passage holes for recording.
  • the application time (pulse width value) is classified in each address and stored in advance as data ⁇
  • the latch counter 16 receives the LD signal output from the print control circuit 16 h, outputs the signal to the latch circuit 16 k, and then outputs the pulse width received from the pulse table 16 g. Start counting in synchronization with the clock signal up to the timer value. During this time, a series of processing from ST16 to ST10 is performed.
  • the clock signal input to the latch count 16 f is 1 MHz
  • the lower one bit of the pulse width value is equivalent to 1 sec in the count of the latch count 16 f
  • the application time of the image signal voltage can be changed in increments of 1 sec, and fine grain correction can be performed.
  • the adjacent correction circuit 16b increases the number of bits of the 1/6 line image signal transferred from the first line memory 16a.
  • the adjacency determination circuit 16c compares the image signal stored in the first line memory 16a with the image signal stored in the adjacency correction circuit 16b, and stores the image signal in the first line memory 16a. It is determined whether or not the received image signal is an image signal accompanied by toner flying from an adjacent toner passage hole, and the result of this determination is sent to the adjacent correction circuit 16b.
  • Adjacent correction circuit 16b is adjacent It has a function of correcting the number of gradations of the image signal every dot in accordance with the result of the determination by the determination circuit 16c.
  • the toner flies from the toner passage hole 4 When the toner flies from the toner passage hole 4, the toner flies from the neighboring toner passage holes 4 at the same time, and when the toner flies only from the toner passage hole 4 of interest. And the electric field conditions around the toner passage hole 4 are different. In general, the former (when the toner flies from the neighboring toner passing holes 4 at the same time) is better than the latter (when the toner flies only from the toner passing holes 4 of interest).
  • the electric field of the toner passing hole 4 to be spotted is influenced by the surrounding electric field, so that the toner tends to fly more, and there is a problem that the size of the pixel relatively increases.
  • the function according to the present embodiment corrects the tone of the image signal corresponding to the toner passage hole 4 of interest in accordance with the presence or absence of toner flying from the adjacent toner passage hole 4, that is, the correction, that is, If there is a toner jump from the adjacent toner passage hole 4, make a change to reduce the gradation, and if there is no toner jump from the adjacent toner passage hole 4, make a correction that does not change the gradation.
  • the pulse table 16 g stores image signals corresponding to various conditions such as, for example, gradation, ambient temperature, toner deflecting direction, and a through-hole array for recording.
  • the voltage application time (pulse width timer value) is stored in advance as data, and a pulse width value is output to the latch counter 16f based on an instruction from the print control circuit 16h that specifies the above conditions.
  • the latch counter 16f counts from the pulse tape 16g to the received pulse width or the maximum value to determine the application time of the image signal voltage applied to the control electrode 10a. .
  • the voltage application time can be set independently according to the gradation to be recorded, so that the density modulation (for example, excellent in linearity) based on the good gradation based on the density characteristics in the pixel forming process accompanying the toner flight. Density modulation).
  • printing can be performed by arbitrarily selecting the density modulation condition according to the application from several types of setting conditions stored in the pulse table 16 g in advance. .
  • the electric field condition around the toner passage hole 4 fluctuates due to the difference of the deflection voltage applied to the deflection electrodes 1 la and 11 b due to the modulation in the flying direction of the toner.
  • the pixel size can be made constant by varying the pulse width and the value according to the direction of the toner flight.
  • the toner is formed on the image receiving means ⁇ ⁇ due to the difference in the distance dimension from the toner carrier 1 and the toner supply condition from the toner carrier 1.
  • the problem that the size of a pixel changes can be solved by making the pulse width different depending on the columns 5a and 5b of the toner passage holes where recording is performed.
  • the pulse width timer value at which the image forming apparatus can reproduce the initial characteristics is stored in advance in the pulse table 16 g for each cumulative number of printed sheets, and the pulse width is counted according to the cumulative number of printed sheets counted by the image forming apparatus. By changing the width timer value, it is possible to prevent a change in characteristics due to an increase in the number of printed sheets.
  • a pulse width timer that enables the image forming apparatus to reproduce good characteristics under various environmental conditions is set as follows. By storing in advance in the pulse table 16 g for each temperature or humidity condition, detecting the surrounding temperature or humidity with the image forming apparatus, and varying the pulse width according to the conditions, It is possible to prevent a change in recording characteristics due to a change in environmental conditions.
  • the first method it is necessary to change the correction value independently for each pixel so that the gradation of the image signal varies depending on the presence or absence of toner flying in the adjacent toner passage holes in the toner passage hole array that records simultaneously.
  • a control method in which the image signal processing means 16 changes the gradation of the image signal corresponding to the corresponding toner passage hole depending on the condition sets the correction value for each pixel. This is preferable because it can be set freely. As shown in FIG.
  • an array of pixels formed on the image receiving means 7 and an array of image signals recorded simultaneously (ie, an array of image data inside the first line memory 16a)
  • the image signals to be simultaneously recorded are arranged side by side in the first line memory 16a in which the image signals to be simultaneously recorded are arranged side by side and the adjacent correction circuit 16b located in the subsequent stage. It is effective in terms of circuit configuration to perform correction on pixels to be recorded at the same time.
  • the image signal is corrected by setting the number of bits (the number of gradations) of the corrected image signal to be larger than the number of bits of the original image signal.
  • the various correction targets described above that is, 1) the density characteristic in the pixel forming process due to the toner flying, 2) the difference in the toner flying characteristic due to the modulation of the deflection voltage, and 3) the toner passage hole 4) Cumulative difference in toner flight characteristics in columns 5a and 5b
  • the correction for the change in the recording density characteristics due to the number of prints, 5) the change in the recording density characteristics due to environmental conditions such as ambient temperature or humidity, etc. is stored in the pulse table 16 g as shown in this embodiment.
  • the correction method that uses different pulse width timer values according to the conditions can collectively correct the rows of toner passage holes that are recorded simultaneously, and the pulse width value can be changed finely in time. In this regard, there are advantages in recording speed and circuit configuration.
  • the above 1) to 5) are fluctuation factors which act uniformly on a plurality of toner passage holes belonging to the same row of toner passage holes.
  • the application time of the image signal voltage should be at least 8 to 16 times smaller than the base voltage application time (for example, ⁇ sec) It is necessary to set in increments, and especially for 4) and 5), it is necessary to change it continuously.
  • the application time of the image signal voltage must be at least 8 to 16 times smaller (for example, several milliseconds) than the base voltage application time.
  • the base voltage application time corresponding to one gradation of the image signal is 160 is ec (16 10), and the image signal has eight gradations. However, it takes 1280 ⁇ sec (8 x 160) to form one pixel.
  • the pulse width timer value output by the pulse table 16 g becomes 1 sec
  • the increment of the image signal voltage application time which can be output by the image signal processing means 16 is also 1 sec.
  • the above-mentioned voltage application time corresponding to one gradation of an image signal is 16 ⁇ sec (16X1), and the time for forming one pixel is 12.8 ⁇ sec (8 1 6) and 1/10 when the first method is used, and the recording speed is improved.
  • the frequency of the clock signal output from the print control circuit 16h should be increased or one shift register should be used. It is necessary to reduce the number of bits related to evening 16j and increase the number of series circuits that process image signals, both of which increase the circuit scale and increase costs.
  • the first and second types of control methods described above are applied to the problems specific to the recording apparatus that forms pixels by flying toner by an electric field.
  • the control target By properly using the control target, it is possible to prevent an increase in circuit cost and to improve image quality and recording speed.
  • the image signal corresponding to the toner passing hole of interest was given a correction to change its gradation, but other factors that fluctuated for each pixel were corrected. You may. For example, by performing fine grain correction by changing gradation data for density unevenness that fluctuates for each pixel in the main scanning direction, the unevenness can be eliminated. In addition, by performing image processing such as edge enhancement of an image signal using the function of the image signal processing means, the processing load on an external device of the image forming apparatus can be reduced.
  • a plurality of rows of toner passage holes are provided, and a plurality of image signal processing circuits are provided for each of the rows.
  • a configuration in which each row of toner passage holes and a single image signal processing circuit are provided is provided. In that case, the configuration can be simplified.
  • the memory control circuit 16i is configured by hardware such as a logic circuit, but the operation by software by a microprocessor and its peripheral circuits is also possible.
  • Embodiments B and C drawings of other two embodiments of the present invention. It will be described with reference to FIG. Note that the same components as those in the embodiment A are denoted by the same reference numerals, and description thereof will be omitted.
  • FIG. 1 is a side sectional view showing a configuration of an embodiment of the present invention
  • FIG. 12 is an enlarged view of an electrode portion of the embodiment in a plane direction
  • FIG. 3 is a control block diagram.
  • the distance between the row 5 a of the toner passage holes 4 (upper side) and the row 5 b of the toner passage holes 4 (lower side) is 300 to 400 zm. It is about.
  • a control electrode 10 is arranged on the upper surface of the main film 8 so as to surround the toner passage hole 4, and a pair of deflection electrodes 11 is arranged on the lower surface of the main film 8 so as to surround the toner passage hole 4 from both sides. as 1 1b is provided.
  • These electrodes 10, 11 a, and lib are composed of a C 11 film having a thickness of about 8 to 20 ⁇ m, which is patterned on the main film 8.
  • the pair of deflection electrodes 1 1 a, 1 1 b, with respect to the center line of the column 5 a, 5 b of the toner passage hole 4, t & 11 (angle 6 but becomes 1 / / 3>, i.e. 1 It is arranged so as to face the 8.4 ° inclined direction.
  • each toner passage hole 4 is formed by a long hole in which the length L in the moving direction of the toner carrier 1 is larger than the width W in the direction orthogonal thereto.
  • the length L is set to about 100 ⁇ m
  • the width W is set to about 70 to 80 ⁇ m.
  • the width of the control electrode 10 around the toner passage hole 4 is set such that the width tl in the major axis direction of the toner passage hole 4 is larger than the width t 2 in the minor axis direction.
  • the control electrode 10 and its driving IC are connected to the row 5 a of the toner passage hole 4 on the upper side in the moving direction of the toner carrier 1 with the connection electrode 12 a extended to the upper side, and similarly on the lower side.
  • the row 5b of the through hole 4 is connected by a connection electrode 12b extending to the lower side.
  • the deflection electrodes 11a and 11b and the driving IC thereof are arranged in the same manner as the deflection electrodes 11a on one side of the toner passage hole 4 in both rows 5a and 5b.
  • the connection electrodes 13a extending to the upper side in the moving direction of the toner carrier 1 are connected to each other.
  • FIGS. 13A and 13B are timing charts showing states of voltages applied to the control electrode 10 and the deflection electrode.
  • FIG. 13A shows the applied voltage Vp to each control electrode 10, and FIGS. It shows the change of applied voltage VDD-L, VDD-R for deflection electrode 11a, 1lb.
  • the applied voltage Vp to each control electrode 10 is, for example, between 150 V, 200 V, and 250 V, and the applied voltage VDD-L, VDD-R to the deflection electrodes 11 a and 11 b. Is switched between, for example, 150 V, 0 V, and ⁇ 150 V, and the voltage applied to the back electrode 6 is, for example, 100 V.
  • FIG. 5 is an operation explanatory diagram showing the flying operation of the toner 2
  • FIG. 14 is an operational explanatory diagram showing the state of the pixels formed on the image receiving means 7.
  • the deflection electrodes 11a and 11 1) are both 0, and the control electrode 10 is set to 150 V and the electric field generated by the back electrode 6 is set to the toner.
  • An initial state is formed so as not to affect the toner 1 adsorbed on the one carrier 1.
  • +150 V is applied to the left deflection electrode 11 a and 1 150 V is applied to the right deflection electrode 11 b, and the negatively charged toner 2 is applied.
  • a voltage of 250 V is first applied to peel off the toner 12 adsorbed on the toner carrier 1, and then a voltage of 200 V is applied.
  • the voltage is individually varied for each toner passage hole for the toner passage hole 4 until the time T aL which is different for each toner passage hole for the row 5 a of the toner passage hole 4, and the time T b L for each toner passage hole for the row 5 a of the toner passage hole 4.
  • the toner 2 passes through the toner passage hole 4 and deflects to the left, flies, and faces the toner passage hole 4 on the image receiving means 7 as shown in FIG. 5A.
  • Toner is provided at a position displaced by, for example, 42 m to the left of the position.
  • the control electrode 10 applies a different time T aC to each row of toner passage holes 4 for each toner passage hole.
  • TbC the same voltage up to TbC
  • the toner 2 is applied to the image receiving means 7 at a position facing the toner passage hole 4 as shown in FIG. 5B.
  • the deflecting electrodes lla and lib With respect to the center line of row 5a, it is arranged so that tan (is an angle 6> at which 1 Z3 is 1> 3, that is, 18.4 °.
  • the flying toner 2 flies in a direction inclined by 18.4 ° with respect to the center line of the row 5 a of the toner passage holes 4, and the effect of the conveyance of the image receiving means 7 is canceled out, so that one toner passage hole
  • the three pixels at the left, right, and center by 4 are formed parallel to the main scanning direction, where the distance P between the columns 5a and 5b of the toner passage holes 4 is the pixel in the sub-scanning direction as described above. Because the pitch is equal to the pitch, the toner flies from the rows 5a and 5b of the toner passage holes 4 at the same time so that And m-1 line of pixels can be simultaneously formed.
  • the formation of the pixels of the m + 1 line and the m line by the columns 5 a and 5 b of the toner passage hole 4 is shown as the control electrode 10 and the deflection electrode 11 a. , And 11b by sequentially switching the applied voltage, in the same manner as described above.
  • toner is applied to the left, right, and center at one toner passage hole 4, and as shown in FIG. 14B, the images formed by the rows 5a and 5b of the toner passage hole 4 are formed.
  • the moving speed of the image receiving means 7 is determined by the row 5 a of the toner passage holes 4. Is set to the value obtained by dividing the inter-column distance P of 5b by the time period of recording by each column, so that the pixels recorded in column 5a and the pixels recorded in column 5b are in the main scanning direction. It leads to a straight line.
  • the form of the missing toner formed on the toner carrier 1 corresponding to the pixel formed at the position of the m-th line of the image receiving means 7 is as shown in FIG.
  • the toner missing portion formed by the toner passage holes 5a and 5b is a portion surrounded by a solid line and a broken line, and the thickness of the remaining toner layer is reduced as compared with the portion other than the toner missing portion.
  • Tonner The numbers inside the holes correspond to the numbers of the pixels on the m-line in Figure 14B.
  • Each value is set so that the condition is satisfied.
  • a voltage is applied to the control electrodes in row 5b
  • the toner missing on the toner carrier located above row 5b passes through the toner in row 5b of interest. It is formed by toner flying from row 5a in the same direction as the direction of toner deflection from the holes. Therefore, the toner flying from the toner passage hole in the 5b row of toner passes through the toner passage hole of the adjacent 5a row in the same deflection direction, and the toner missing in the toner carrier formed in one row and the sub-scanning direction. Supplied from the same location.
  • the amount of toner supplied to the toner passage holes in row 5b is such that if the toner flies in the same deflection direction from the adjacent toner passage holes in row 5a, the toner The amount of toner supplied to the hole is insufficient by the area integral in the shaded area in FIG.
  • the voltage applied to the control electrode 10 in the formation of the pixel by the row 5b of the toner passage holes 4 of interest is considered.
  • the voltage application time is controlled based on an image signal corresponding to the toner passage hole 4 on the row 5a adjacent in the main scanning direction. For example, in the case of recording in the left direction by the n-th toner passage hole in the 5b-th row, the voltage application time T b L is set to the left from each of the toner passage holes in the 5th-row n-th and 5a-row ⁇ + 1st. Determined by referring to the image signal corresponding to the pixel recorded in the direction.
  • T b L is increased, and no pixel is formed. In such a case, a correction that does not increase T b L is performed.
  • the voltage application time T b C is calculated from the toner passage holes in row 5a row nth and 5a row n + 1.
  • the voltage application time T is determined in the same manner as in the case of the left direction by referring to the image signal corresponding to the pixel recorded in the right direction from each of the toner passage holes in the column n + 1.
  • the toner 2 flies in accordance with the image signal from the adjacent toner passage hole 4 on the row 5 a of the toner passage holes, and the amount of toner remaining on the toner carrier 1 is reduced.
  • the toner missing portion formed on the toner carrier 1 does not necessarily mean that no toner remains as described above.
  • the thickness of the remaining one layer of the toner is reduced compared to the portion other than the portion where the toner is missing. Therefore, when the toner flies from the toner passage holes in row 5b, by increasing the voltage application time to the control electrode, more toner can fly in the thickness direction, and the toner remaining on the toner carrier The shortage of area can be compensated.
  • the voltage application time of the voltage applied to the control electrode 10 is set on the adjacent column 5a in the main scanning direction. Is controlled based on the image signal corresponding to the toner passage hole 4 of the toner.
  • the toner flies in both of the adjacent left and right toner passage holes, and when the toner flies in one of the left and right toner passage holes.
  • the optimum voltage application time was set in each case. Can be set.
  • the voltage application time by the toner passage holes in the 5b-th column is controlled by referring to the image signals corresponding to the pixels recorded in the same direction from the toner passage holes in the adjacent 5a-th column. It is not necessary to refer to the image signals corresponding to the pixels recorded in the same direction.
  • the moving speed of the toner carrier 1, the distance between the pitches of the rows 5a and 5b, and the voltage due to the rows 5a and 5b The optimal reference pixel derived from the time period of the application (the image signal of the recording pixel in column 5a that formed the missing toner on the toner carrier near column 5b when the voltage in column 5b was applied) ) To control.
  • the toner passage control unit arranges a number of toner passage holes arranged in a direction orthogonal to the moving direction of the toner carrier, and the toner passage holes are arranged in a staggered manner.
  • the configuration has two rows, the upper side and the lower side, in the moving direction of the toner carrier.
  • a configuration in which a plurality of rows are provided at appropriate pitch intervals may be used.
  • Embodiment C of the present invention will be described.
  • the configuration according to the embodiment C is the same as that of the embodiment B shown in FIG. 1, FIG. 3, and FIG.
  • the description of the operation of forming the pixel is also the same as that of the embodiment B shown in FIGS. 5, 13, and 14, and the description is omitted.
  • the voltage application time of the voltage applied to the control electrode 10 in each of the pixel forming processes by each of the columns 5 a and 5 b of the toner passage holes is the same as that of the adjacent column in the main scanning direction.
  • the control is individually performed based on the image signals corresponding to the pixels recorded simultaneously from the toner passage holes.
  • Fig. 16 shows the relationship between pixels that refer to image signals when recording pixels. For example, in the case of recording to the left by the toner passage hole in row 5a n + 1, the voltage application time T aL is determined by the toner passage in row 5a n and 5a row n + 2.
  • the voltage application time T aC and T aR are calculated as follows. The voltage application time is determined in the same manner as in the case of the left direction by referring to the image signals corresponding to the pixels simultaneously recorded in the center direction and the right direction from each of the toner passage holes.
  • the voltage application time to the control electrode is determined in the same manner as in the 5a row.
  • the toner flies from the adjacent toner passage holes on the same row at the same time through the toner passage holes of interest, causing mutual interference between adjacent electric fields, increasing the strength of the electric field.
  • the electric field method changing radially outward from the center of the toner passage hole, the amount of the toner flying and the impact of the toner on the toner passage hole are smaller than if the toner did not fly from the adjacent toner passage hole at the same time.
  • the increase in the number of pixels is corrected by reducing the voltage application time to the control electrode in the toner passage hole of interest. be able to.
  • the voltage application time of the voltage applied to the control electrode corresponds to the pixels recorded simultaneously from the toner passage holes on the same column adjacent in the main scanning direction.
  • the voltage application time of the voltage applied to the control electrode is set to the image corresponding to the toner passage hole on the adjacent row in the main scanning direction.
  • the control is performed based on the signal.
  • the toner is flying in both the adjacent left and right toner passage holes, and the toner is flying in one of the left and right toner passage holes. Therefore, in order to control the voltage applied to the control electrode with a different voltage application time, an optimum voltage application time can be set in each case. Even when the image signal to be referred to has a gradation, by performing control based on the accumulated value of the left and right gradation data, more fine-grained correction considering the gradation data is performed. Can be performed favorably.
  • the control is performed based on the image signal corresponding to one toner passage hole on the adjacent row in the main scanning direction.
  • a plurality of one toner passage holes are arranged in the adjacent direction. May be configured to refer to an image signal corresponding to. As a result, highly accurate correction can be realized.
  • the toner passage control means arranges a row in which a number of toner passage holes are arranged in a direction orthogonal to the moving direction of the toner carrier, and the toner passage holes are arranged in a staggered manner.
  • the configuration has two rows on the upper side and the lower side in the moving direction of the toner carrier.
  • a configuration having one row or a configuration having a plurality of rows at appropriate pitch intervals may be used.
  • the voltage application time of the voltage applied to the control electrode is simultaneously recorded from the toner passage holes on the adjacent row in the main scanning direction. The control is performed based on the image signal corresponding to the pixel of interest.
  • a configuration in which the voltage application time of the voltage applied to the control electrode of the toner passage hole of interest is varied according to both the image signals corresponding to the pixels formed in the image means (the configuration shown in (b) of Fig. 17) ).
  • the size of the pixels formed around the image is set to a size that provides sufficient density in the background recording.
  • the area of the white area becomes small and the characters and lines become unclear.
  • the size of the pixels around the white pixel is adjusted in the sub-scanning direction or the main scanning with the sub-scanning direction. In both directions, the size can be reduced, and even if the size of the pixels formed in the background area is set to a size that provides sufficient density in the background recording, the size of the white pixels is secured. White characters and white lines can be clearly recorded. As shown in FIG.

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  • Printers Or Recording Devices Using Electromagnetic And Radiation Means (AREA)

Abstract

L'invention concerne un dispositif de formation d'images alimentant en toner (2), provenant d'un réservoir (1) de toner, un récepteur (7) d'images par le biais d'un trou (4) de passage, grâce à l'application, aux électrodes de commande (10), de tensions de signal d'image dépendant du signal d'image. Chaque tension de signal d'image consiste en plusieurs tensions d'impulsion correspondant à une gradation du signal d'image et on varie le temps d'application d'une tension de signal d'image en modifiant le nombre de tensions d'impulsion en fonction d'un signal d'image corrigé de manière à changer la gradation d'un signal d'image, et en modifiant la largeur d'impulsion d'une tension d'impulsion. Un processeur (16) de signal d'image envoie différents potentiels de tension ou différents temps d'application de tension à différentes électrodes de commande (10) se trouvant dans des rangées en aval en fonction de signaux d'image correspondant aux électrodes de commande (10) se trouvant dans des rangées en amont, à côté des électrodes de commande (10) qui se trouvent dans des rangées en aval dans une direction parallèle à celle des rangées.
PCT/JP2000/000910 1999-02-17 2000-02-17 Dispositif de formation d'images Ceased WO2000048840A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU25733/00A AU2573300A (en) 1999-02-17 2000-02-17 Image forming device

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
JP11/38373 1999-02-17
JP11038373A JP2000233526A (ja) 1999-02-17 1999-02-17 画像形成装置
JP11/167711 1999-06-15
JP11167711A JP2000355116A (ja) 1999-06-15 1999-06-15 画像形成装置

Publications (2)

Publication Number Publication Date
WO2000048840A1 true WO2000048840A1 (fr) 2000-08-24
WO2000048840A8 WO2000048840A8 (fr) 2000-11-02

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AU (1) AU2573300A (fr)
WO (1) WO2000048840A1 (fr)

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Publication number Priority date Publication date Assignee Title
JPS63136058A (ja) * 1986-11-28 1988-06-08 Fuji Xerox Co Ltd 粉体画像記録装置
JPS63278860A (ja) * 1987-05-11 1988-11-16 Oki Electric Ind Co Ltd 記録ヘッドの駆動制御回路
JPH0326557A (ja) * 1989-06-26 1991-02-05 Sony Corp 感熱型プリンタ
JPH0351145A (ja) * 1989-07-20 1991-03-05 Sony Corp 感熱素子駆動装置
US5079564A (en) * 1988-11-11 1992-01-07 Ricoh Company, Ltd. Recording apparatus using a time varying distribution of heat element driving pulses
WO1992000196A1 (fr) * 1990-06-26 1992-01-09 Eastman Kodak Company Imprimante a reseau de del
JPH04163167A (ja) * 1990-10-26 1992-06-08 Brother Ind Ltd ドットマトリクス式プリンタ
JPH04279353A (ja) * 1991-03-08 1992-10-05 Brother Ind Ltd 画像形成装置
JPH0569597A (ja) * 1991-07-16 1993-03-23 Oki Electric Ind Co Ltd ドツト印字ヘツドの駆動方法
JPH0577475A (ja) * 1991-09-20 1993-03-30 Brother Ind Ltd 画像形成装置
JPH0596783A (ja) * 1991-10-14 1993-04-20 Mitsubishi Electric Corp 発光ダイオード駆動装置
JPH05177872A (ja) * 1991-12-28 1993-07-20 Kyocera Corp ドット画像出力装置における階調制御方法
JPH05212904A (ja) * 1992-02-04 1993-08-24 Futaba Corp プリンタ用光源の光量制御回路
JPH05318812A (ja) * 1992-05-19 1993-12-03 Brother Ind Ltd 画像形成装置
US5404155A (en) * 1992-11-13 1995-04-04 Brother Kogyo Kabushiki Kaisha Image forming apparatus having an aperture electrode with controlled image potential
JPH07256921A (ja) * 1994-03-24 1995-10-09 Sanyo Electric Co Ltd 蛍光ヘッドの光量補正装置
EP0773487A1 (fr) * 1995-11-09 1997-05-14 Agfa-Gevaert N.V. Dispositif pour impression électrostatique direct (DEP) avec "correction par avance"
JPH09193446A (ja) * 1996-01-24 1997-07-29 Ricoh Co Ltd 静電粉体記録方法及び静電粉体記録装置
JPH10337898A (ja) * 1997-06-10 1998-12-22 Sharp Corp 画像形成装置

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS63136058A (ja) * 1986-11-28 1988-06-08 Fuji Xerox Co Ltd 粉体画像記録装置
JPS63278860A (ja) * 1987-05-11 1988-11-16 Oki Electric Ind Co Ltd 記録ヘッドの駆動制御回路
US5079564A (en) * 1988-11-11 1992-01-07 Ricoh Company, Ltd. Recording apparatus using a time varying distribution of heat element driving pulses
JPH0326557A (ja) * 1989-06-26 1991-02-05 Sony Corp 感熱型プリンタ
JPH0351145A (ja) * 1989-07-20 1991-03-05 Sony Corp 感熱素子駆動装置
WO1992000196A1 (fr) * 1990-06-26 1992-01-09 Eastman Kodak Company Imprimante a reseau de del
JPH04163167A (ja) * 1990-10-26 1992-06-08 Brother Ind Ltd ドットマトリクス式プリンタ
JPH04279353A (ja) * 1991-03-08 1992-10-05 Brother Ind Ltd 画像形成装置
JPH0569597A (ja) * 1991-07-16 1993-03-23 Oki Electric Ind Co Ltd ドツト印字ヘツドの駆動方法
JPH0577475A (ja) * 1991-09-20 1993-03-30 Brother Ind Ltd 画像形成装置
JPH0596783A (ja) * 1991-10-14 1993-04-20 Mitsubishi Electric Corp 発光ダイオード駆動装置
JPH05177872A (ja) * 1991-12-28 1993-07-20 Kyocera Corp ドット画像出力装置における階調制御方法
JPH05212904A (ja) * 1992-02-04 1993-08-24 Futaba Corp プリンタ用光源の光量制御回路
JPH05318812A (ja) * 1992-05-19 1993-12-03 Brother Ind Ltd 画像形成装置
US5404155A (en) * 1992-11-13 1995-04-04 Brother Kogyo Kabushiki Kaisha Image forming apparatus having an aperture electrode with controlled image potential
JPH07256921A (ja) * 1994-03-24 1995-10-09 Sanyo Electric Co Ltd 蛍光ヘッドの光量補正装置
EP0773487A1 (fr) * 1995-11-09 1997-05-14 Agfa-Gevaert N.V. Dispositif pour impression électrostatique direct (DEP) avec "correction par avance"
JPH09193446A (ja) * 1996-01-24 1997-07-29 Ricoh Co Ltd 静電粉体記録方法及び静電粉体記録装置
JPH10337898A (ja) * 1997-06-10 1998-12-22 Sharp Corp 画像形成装置

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