JP2019045565A - Display panel and image forming apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce the influence of noise from the outside and suppress light leakage in a display panel. SOLUTION: In a cover member 12a, 12b, a light emitting portion 32 provided on a substrate 30 and a light guide member 20d whose one end side is exposed to the outside of the cover member 12a and guides light from the light emitting portion 32 to the outside. The operation display unit 10 having the It is composed of a light-shielding sheet 42 having light-shielding properties and conductivity formed in a predetermined range on one surface side of the insulating sheet 41, and the non-formed surface of the light-shielding sheet 42 faces the substrate 30, and the light from the light emitting unit 32 is emitted. The light-shielding sheet 42 is guided to the light guide member 20d via the insulating sheet 41 at the non-forming portion of the light-shielding sheet 42, and the light-shielding sheet 42 is in contact with other conductive members in the housing. [Selection diagram] FIG. 8

Description

  The present invention relates to a display panel and an image forming apparatus.

  A light guide such as an LED provided inside the display panel is caused to emit light on the display panel of the electronic device, and a resin-made light guide member continuous to the housing (cover member) of the display panel is provided to light the light guide member. It has been known.

  For example, on a display panel provided in a multifunction peripheral (image forming apparatus) that realizes two or more functions among functions such as scanning, printing, copying, and FAX transmission / reception, a facsimile reception notification or toner In order to notify the user of various conditions such as end, paper jam error occurrence, etc., it is known to light the LED provided inside the display panel and light the light guide member of the display panel housing. ing.

  In such a display panel, in order to secure the light amount, the light source is provided in a position close to the casing inside the casing, and thus the substrate on which the light source is provided is also formed in the casing to a position close to the casing. Susceptible to external noise. In particular, the influence is remarkable in a thin display panel. Noise and its influence include, for example, a gap between the housing of the display panel and the light guide member, and between members constituting the housing (for example, a member on the display surface side and a member on the other surface side of the display panel). It is known that an electronic component mounted on an internal substrate may be electrically damaged by static electricity flying from the outside to the internal substrate through a gap).

  It is also conceivable that light from the light source leaks from the gap. Since the light amount of the light source of the display panel is small, it may be considered that lighting is insufficient when light leakage occurs.

  As a technique for light shielding and countermeasures against static electricity, for example, Patent Document 1 discloses a mobile phone device in which a conductive paint is applied to a light guide member (key top) overlaid on an internal light shielding sheet.

  In addition, as countermeasures against static electricity, increase the distance from the outside of the housing to the board, and provide a sheet metal member such as a shield plate that is grounded inside the housing, and place it close to the electronic components on the board. Thus, it is considered that static electricity from the outside does not affect the electronic components of the board.

  However, when a light guide member is provided, it is difficult to insulate by increasing the distance from the outside of the housing to the substrate in order to secure the amount of light. In addition, when a sheet metal member is provided, it is necessary to provide a sheet metal member so as not to block the optical path from the light source to the light guide member, and a substrate provided at an end portion inside the housing of the display panel that saves space Since there is not enough space for arranging the sheet metal member for the electronic component, it is difficult to install the sheet metal member in the housing of the display panel. Note that, as in Patent Document 1, in the configuration in which the conductive paint is applied to the key top used for the user's operation, the paint may be worn away over time and the function may not be established.

  Thus, conventionally, there remains room for study on reducing the influence of external noise such as countermeasures against static electricity in a display panel having a light guide member, and suppressing light leakage.

  SUMMARY OF THE INVENTION An object of the present invention is to provide a display panel that can reduce the influence of noise from the outside and suppress light leakage.

  In order to achieve such an object, a display panel according to the present invention includes a light source provided on a substrate in a housing, and a light guide that has one end exposed to the outside of the housing and guides light from the light source to the outside. A display panel having at least a sheet member disposed between the light guide member and the light source, wherein the sheet member includes an insulating first sheet member and A second sheet member having a light shielding property and conductivity formed in a predetermined range on one surface side of the first sheet member, wherein the non-formed surface of the second sheet member faces the substrate. The light from the light source is guided to the light guide member via the first sheet member at the non-forming portion of the second sheet member, and the second sheet member is It is in contact with another conductive member.

  According to the present invention, it is possible to reduce the influence of external noise and suppress light leakage.

1 is an external perspective view illustrating an example of an image forming apparatus. 2 is a schematic configuration diagram of an operation display unit included in the image forming apparatus. FIG. It is a perspective view which shows a part of external appearance of the operation display part. It is a perspective view (1) which shows the internal structure of an operation display part. It is a perspective view (2) which shows the internal structure of an operation display part. It is a perspective view which shows the cross section in the A-A 'line | wire of FIG. FIG. 4 is a cross-sectional view taken along line A-A ′ of FIG. 3. It is principal part explanatory drawing of the operation display part which concerns on this embodiment. It is principal part explanatory drawing of the operation display part which concerns on a comparative example. It is explanatory drawing which shows the mode of reflection of the light by a light shielding sheet. It is explanatory drawing which shows the mode of the reflection of the light by the light shielding sheet in case it has a light emission part on both surfaces of a board | substrate.

  Hereinafter, a configuration according to the present invention will be described in detail based on the embodiment shown in FIGS.

(Image forming device)
FIG. 1 is an external perspective view showing the overall configuration of an image forming apparatus 1 that is an embodiment of an image forming apparatus according to the present invention.

  The image forming apparatus 1 is, for example, a multifunction peripheral (MFP) that realizes two or more functions, such as scanning, printing, copying, and FAX transmission / reception, by a single casing. However, a scanner, a printer, a copier, or a facsimile having any one function may be used as the image forming apparatus 1.

  An image forming apparatus 1 shown in FIG. 1 supplies paper to a paper feed tray 2 or a manual feed tray 3 and, for example, when functioning as a printer, from an information processing apparatus such as a personal computer connected via a network. After transmitting the print job, the paper is fed from a designated tray at a predetermined timing so as to pass through a conveyance path inside the apparatus. When functioning as a copy, when a print setting is made on the operation display unit 10 and a print start button is pressed, a document placed on the scanner unit 4 or a document fed from the automatic document feeding mechanism (ADF 5) is read. Thus, the paper is fed from the designated tray at a predetermined timing so as to pass through the conveyance path inside the apparatus.

  At this time, inside the image forming apparatus 1, the image is transferred to the image carrier in the image forming process based on the image data of the print job or the read image data and the print command, and the sheet further passes through the conveyance path. The image is transferred to. The sheet on which the image is transferred passes through the fixing unit, and the toner of the image on the sheet is fixed by heat, and is discharged to the sheet discharge tray 6.

  When performing double-sided printing, the paper on which single-sided printing has been completed is conveyed to the double-sided conveyance path by the reversing roller before it is discharged to the paper discharge tray 6, and the front end of the back side is returned to the conveyance path again. After the fixing of the image is completed, the paper is discharged to the paper discharge tray 6.

  The installation position of the operation display unit 10 in the image forming apparatus 1 is not limited to the example of FIG. 1, but is provided at a position where the user can easily operate and visually check. For example, as shown in FIG. 1, it is preferably provided on the upper side and the front side of the image forming apparatus 1. Thereby, operativity and visibility can be made favorable.

(Operation display section)
The display panel according to the present embodiment has a light source (light emitting unit 32) provided on a substrate (substrate 30) in the housing (cover member 12) and one end side exposed to the outside of the housing, and transmits light from the light source. A display panel (operation display unit 10) having a light guide member (light guide member 20) for guiding light to the outside, and at least a part of the sheet member (sheet) disposed between the light guide member and the light source Member 40), and the sheet member has a first sheet member (insulating sheet 41) having an insulating property and a light shielding property and conductivity formed in a predetermined range on one surface side of the first sheet member. A second sheet member (light shielding sheet 42), the non-formation surface of the second sheet member faces the substrate, and the light from the light source is the first sheet at the non-formation part of the second sheet member The second sheet member is guided to the light guide member via the member. , Those in contact with another conductive member (metal plate member 35) within the enclosure. In addition, the code | symbol in embodiment and the example of application are shown in a parenthesis.

  FIG. 2 is a schematic configuration diagram of the operation display unit 10 which is an embodiment of the display panel according to the present invention. The operation display unit 10 includes a liquid crystal display device (LCD) having a touch panel function. That is, the operation display unit 10 has an input operation function and a display function. In the present embodiment, an operation display unit (operation display panel) having an input operation function and a display function will be described as an example of the display panel according to the present invention. However, the display panel according to the present invention has at least a display mechanism. It only has to be provided.

  In the operation display unit 10, various types of information such as print settings and instructions are displayed on the liquid crystal display unit 11. The liquid crystal display unit 11 can be operated in various ways by touching icons displayed on the touch panel. The liquid crystal display unit 11 is not limited to a liquid crystal display device (LCD), and may be an organic EL display device or the like.

  Light guide members 20a, 20b, and 20c (hereinafter referred to as the light guide member 20 if not distinguished) are provided on the outer peripheral portion of the cover member 12 that is the casing of the operation display unit 10, and the light guide member When 20 is turned on or blinking, the user is informed that it is in a predetermined state. Moreover, the status of the image forming apparatus 1 that each light guide member 20 means is described near the light guide member 20.

  In the example of the operation display unit 10 shown in FIG. 2, the light guide member 20a is turned on when data-in (job reception), the light guide member 20b is turned on when receiving a facsimile, and the light guide member 20c is a toner end. It is a lighting part of a status confirmation warning that lights up in the case of troubles such as jams and jams.

  The operation display unit 10 is preferably provided so as to be detachable from the image forming apparatus 1. FIG. 3 is a perspective view showing a part of the appearance of the operation display unit 10, from a surface (hereinafter also referred to as a back surface) opposite to a surface (hereinafter also referred to as a front surface) on which the liquid crystal display unit 11 is provided. FIG.

  The cover member 12 includes a first cover member 12a on the back surface side and a second cover member 12b on the front surface side, and an SD card insertion portion 13 and a USB port 14 are provided on the first cover member 12a. Further, as the light guide member 20d, there is provided a lighting part that is turned on when the insertion of the SD card is detected.

  FIG. 4 is a perspective view showing a state in which the first cover member 12a is removed from FIG. FIG. 5 is a perspective view showing the internal configuration of the operation display unit 10 at another angle as viewed from the direction of arrow A in FIG. FIG. 6 is a perspective view showing a cross section taken along line A-A ′ of FIG. 3, and shows a perspective view of the first cover member 12 a. FIG. 7 is a cross-sectional view taken along the line A-A ′ of FIG. 3.

  FIG. 8 is a schematic diagram in which FIG. 7 is simplified for the purpose of explaining the main part of the operation display unit 10 according to the present embodiment. Further, FIG. 9 shows an example in which the sheet member 40 of FIG. 8 is not provided for comparison with the operation display unit 10 according to the present embodiment.

  For example, as shown in FIG. 8, the substrate 30 is a printed circuit board (PCB) having a resist pattern 31 formed on both sides, and an electronic component including a light emitting unit 32 (LED) is mounted thereon. In the example of FIGS. 8 and 9, for the sake of explanation, a gap corresponding to the height of the light emitting portion 32 is formed between the substrate 30 and the sheet member 40. However, when mounting, the sheet member 40 is the substrate. 30 is substantially grounded (see FIG. 7).

  As shown in FIGS. 7 to 9, the inside of the operation display unit 10 is configured from the front surface side in the order of the liquid crystal display unit 11, the substrate 30, and the first cover member 12 a on the back surface side. The light guide member 20d is disposed between the first cover member 12a on the back surface side and the substrate 30 so that one end side is exposed from the first cover member 12a. 8 and 9, illustration of the liquid crystal display unit 11, the sheet metal member 35, the light guide member 20b, and the like is omitted.

  In such a configuration of the operation display unit 10, as shown in FIG. 8, a portion where the light guide member 20 d is inserted into the first cover member 12 a (that is, the boundary portion between the light guide member 20 and the cover member 12) It is inevitable that a slight gap is generated at the joint portion (referred to as the housing gap 16) between the first cover member 12a and the second cover member 12b).

  For this reason, as shown by the arrows in FIG. 9, the electronic components of the substrate 30 are electrically damaged by static electricity flying (conducting) toward the substrate 30 through the light guide member gap 15 and the housing gap 16. There is a fear. In particular, as the operation display unit 10 is made thinner, the positions of the light guide member gap 15 and the housing gap 16 and the substrate 30 are closer to each other. Moreover, since the light emission part 32 and the light guide member 20 are arrange | positioned close to an exterior surface in order to ensure light quantity, as shown by the arrow of FIG. 9, between the 1st cover member 12a and the 2nd cover member 12b The light from the light emitting part 32 leaks through the gap, or the light from the light emitting part 32 may be seen through depending on the thickness, material, and color of the first cover member 12a and the second cover member 12b. Sometimes.

  Therefore, the operation display unit 10 according to the present embodiment is configured to dispose the sheet member 40 as illustrated in FIGS. 4 to 8. The sheet member 40 is formed by attaching a light shielding sheet 42 to a predetermined range on one surface side of the insulating sheet 41 using an adhesive material or the like. Hereinafter, the surface of the sheet member 40 to which the light shielding sheet 42 is attached is referred to as a formation surface of the light shielding sheet 42, and the surface to which the light shielding sheet 42 is not attached is referred to as a non-forming surface of the light shielding sheet 42. In the sheet member 40, a range where the light shielding sheet 42 is affixed is referred to as a forming part of the light shielding sheet 42, and a range where the light shielding sheet 42 is not affixed (a range including only the insulating sheet 41).

  The insulating sheet 41 is a light transmissive and insulating sheet member, and is, for example, a PET (polyethylene terephthalate) sheet. The light shielding sheet 42 is a sheet member having light shielding properties and conductivity, and is, for example, an aluminum sheet (aluminum foil).

  As shown in FIG. 8 and the like, the sheet member 40 is disposed between the substrate 30 (light emitting unit 32) and the light guide member 20d, between the substrate 30 (light emitting unit 32) and the light guide member gap 15, and between the substrate 30 (light emission). Portion 32) and the housing gap 16 to block the space therebetween.

  Here, the sheet member 40 is disposed such that the non-forming surface of the light shielding sheet 42 faces or contacts the substrate 30 side, and the forming surface of the light shielding sheet 42 faces the conductive member 20d side.

  In addition, the formation portion of the light shielding sheet 42 is disposed between the substrate 30 and the light guide member gap 15 and between the substrate 30 and the housing gap 16. As a result, the light path from the light emitting part 32 to the light guide member gap 15 and the housing gap 16 is blocked by the light shielding sheet 42, and the light from the light emitting part 32 leaks from the light guide member gap 15 and the housing gap 16. Leakage can be suppressed.

  On the other hand, an unformed portion of the light shielding sheet 42 is disposed at least partially between the light emitting portion 32 and the light guide member 20d. Thereby, the light from the light emitting part 32 is not shielded by the light shielding sheet 42 but is transmitted through the insulating sheet 41 and guided to the light guide member 20d.

  Furthermore, the light-shielding sheet 42 having conductivity is electrically grounded in the casing by being disposed in contact with other conductive members in the casing. The installation of the light shielding sheet 42 will be described with reference to FIG. In the present embodiment, as shown in FIG. 5, the sheet member 40 sticks to the substrate 30 by being inserted through the reference boss 33 that positions the substrate 30 and the sheet metal member 35 in the formation portion of the light shielding sheet 42. And is pressed by the sheet metal member 35 from above. Further, the sheet metal member 35 and the substrate 30 are in contact at a place where the sheet member 40 is not formed (contact place 34).

  Thereby, the light shielding sheet 42 having conductivity is connected to the sheet metal member 35 and is electrically grounded to the sheet metal member 35 and the substrate 30 (the ground of the resist pattern 31). In FIG. 5, the range indicated by reference numeral 36 indicates the resist stripping portion 36 in the substrate 30.

  By setting the light shielding sheet 42 in contact with the sheet metal member 35 and electrically grounding in this way, even when static electricity flies from the light guide member gap 15 or the housing gap 16 to the inside of the cover member 12, Since it does not fly to the electronic component side of the substrate 30 but flows from the light shielding sheet 42 to the ground, the electronic component on the substrate 30 can be protected.

  As described so far, the operation display unit 10 of the present embodiment has the light guide member 20d and the light shielding sheet when the shortest distance from the portion of the light guide member 20d exposed to the housing exterior to the light emitting unit 32 is taken. 42, the insulating sheet 41, and the light emitting unit 32 are arranged in this order. Here, if the light guide member 20d, the insulating sheet 41, the light shielding sheet 42, and the light emitting unit 32 are arranged in this order, the light shielding sheet 42 may have a conductivity and may be short-circuited due to contact with the substrate 30. For this reason, it cannot be in this order.

  Further, as the light shielding sheet 42, it is preferable to use a member (reflecting member) having a property of reflecting light, such as the above-described aluminum foil. Thus, as shown in FIG. 10, among the light guided from the light emitting section 32 to the light guide member 20d, the light leaked from the light guide member 20d as shown by the arrow in the figure is shielded inside the housing. It can be reflected by the sheet 42 and returned to the light guide member 20d. As a result, the amount of light from the light guide member 20d to the outside of the housing is increased, and the light guide member 20d can be lit brightly.

  Further, for example, as shown in FIG. 11, as a light source of the light guide member 20b, a light emitting unit 37 (second light source) is provided on the surface of the substrate 30 opposite to the surface on which the light emitting unit 32 (also referred to as the first light emitting unit 32) is provided. In the case where the light emitting unit 37 is also included, part of the light from the second light emitting unit 37 may pass through the substrate 30 as indicated by arrows in the drawing. This is because the resist pattern 31 is not formed on the end portion of the substrate 30, and the end portion of the substrate 30 transmits light depending on the material and thickness of the substrate 30.

  Therefore, by forming the formation portion of the light shielding sheet 42 of the sheet member 40 so as to cover the end portion (outer shape) of the substrate 30, the light of the first light emitting portion 32 is directed to the surface on which the second light emitting portion 37 is mounted. In addition to preventing leakage, the light from the second light emitting unit 37 is not guided to the light guide member 20d even if it leaks to the surface on which the first light emitting unit 32 is mounted. As described above, by providing the sheet member 40 so as to cover the end portion of the substrate 30, it is possible to prevent light leakage to the opposite side even when the light emitting portion is provided close to the front and back of the substrate 30. Become.

  As described above, the operation display unit 10 according to the present embodiment includes the sheet member 40 even when the density among the cover member 12, the light guide member 20, and the light emitting unit 32 is high. By reducing the influence of noise from the outside, it is possible to suppress the influence of the substrate 30 on the electronic components. Moreover, by providing the sheet member 40, it is possible to improve the light shielding performance and suppress light leakage. Further, by providing the sheet member 40, it is not necessary to provide the sheet metal member 35 for releasing static electricity to a position close to the outside of the housing, so that it is possible to take countermeasures against static electricity without adversely affecting the assembling property.

  The above-described embodiment is a preferred embodiment of the present invention, but is not limited thereto, and various modifications can be made without departing from the gist of the present invention.

  For example, in the above embodiment, an example in which the image forming apparatus includes a display panel has been described. However, if the display panel includes an optical window (light guide member) and a light source for notifying a user of a predetermined state, image formation is performed. The present invention can be applied not only to the apparatus but also to various other electronic devices.

DESCRIPTION OF SYMBOLS 1 Image forming apparatus 2 Paper feed tray 3 Manual feed tray 4 Scanner part 5 ADF
6 Paper discharge tray 10 Operation display unit 11 Liquid crystal display unit 12 Cover member (housing)
12a First cover member 12b Second cover member 13 SD card insertion portion 14 USB port 15 Light guide member gap 16 Housing gap 20 (20a to 20d) Light guide member 30 Substrate 31 Resist pattern 32 Light emitting portion 33 Reference boss 34 (Substrate) Contact point 35 of sheet metal member) sheet metal member 36 resist stripping portion 37 light emitting portion 40 sheet member 41 insulating sheet 42 light shielding sheet

JP 2008-294804 A

Claims (10)

In the housing,
A light source provided on the substrate;
A light guide member having one end side exposed to the outside of the housing and guiding light from the light source to the outside, and a display panel,
At least a part has a sheet member disposed between the light guide member and the light source,
The sheet member is
A first sheet member having insulating properties;
A second sheet member having a light shielding property and conductivity formed in a predetermined range on one surface side of the first sheet member,
A non-formation surface of the second sheet member faces the substrate;
The light from the light source is guided to the light guide member via the first sheet member at a non-forming portion of the second sheet member,
The display panel, wherein the second sheet member is in contact with another conductive member in the casing. When taking the shortest distance from the portion of the light guide member exposed to the outside of the housing to the light source,
The display panel according to claim 1, wherein the light guide member, the second sheet member, the first sheet member, and the light source are arranged in this order.   The display panel according to claim 1, wherein the second sheet member is in contact with a sheet metal member provided in the housing. The forming part of the second sheet member of the sheet member is
The display panel according to claim 1, wherein the display panel is disposed between a boundary portion between the light guide member and the housing and the light source. The casing is formed by joining two or more cover members,
The forming part of the second sheet member of the sheet member is
The display panel according to any one of claims 1 to 4, wherein the display panel is disposed between a joint portion of the two or more cover members and the light source. When the light source is a first light source, a second light source is provided on the opposite surface of the substrate,
The display panel according to claim 1, wherein the second sheet member forming portion of the sheet member covers at least a part of the non-forming portion of the electric wiring of the substrate.   The display panel according to claim 1, wherein the second sheet member is a member that reflects light.   The display panel according to claim 1, wherein the first sheet member is a PET sheet.   The display panel according to claim 1, wherein the second sheet member is an aluminum sheet.   An image forming apparatus comprising the display panel according to claim 1.