JP2007281565A - Image reading apparatus and multifunction machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To make it possible to suppressing the increase of manufacturing cost and to obtain image data reproducing the image of an original highly precisely regardless of the kind of the original. <P>SOLUTION: An imaging element moving mechanism 223 for moving a support member along a subscanning direction by delivering a driving force generated by a motor 222 to the support member for movably supporting a reflection original use light source for emitting light to an original from the same side as the imaging element along the subscanning direction, and a transmission use light source section 318 provided at a side opposite to the support member with a read position in-between are coupled by a coupling mechanism 309 so that the reflection original use light source suitable for reading a reflection original and the transmission use light source section 318 suitable for reading a transmission original are moved by the single imaging element moving mechanism 223. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to an image reading apparatus and a multifunction peripheral.

Conventionally, in addition to a reflective reading mechanism that optically reads a document image by detecting the intensity of light that is irradiated from the same side as the image sensor and reflected by the document with respect to a document table that holds the document, the document In contrast, there is an image reading apparatus in which a reflection plate that reflects light emitted from a light source is provided on the opposite side of the light source so that a reflection-type and transmission-type original image is read by the same reading mechanism (for example, , See Patent Document 1 below).

Conventionally, there is an image reading apparatus that includes a light source and an image sensor that are arranged to face each other with a document table interposed therebetween, and reads a transmission type document by receiving light emitted from the light source by the image sensor. In such a light source in the image reading apparatus, an irradiation area having a width that can irradiate the entire document is secured.

As such an image reading apparatus, there is an image reading apparatus that includes a cover member that holds an original on a document table and prevents unnecessary external light from entering the image sensor. Some image reading apparatuses having a cover member are provided with a light source on the cover member. As the light source, a fluorescent tube or an LED is used.

JP-A-6-178059

However, in the technique of Patent Document 1 described above, the light focused on the image sensor when reading a transmissive original is light that has been transmitted twice through the transmissive original, so that it corresponds to the thickness of the original. There is a problem in that since the image data in which the document images are overlapped with a deviation is generated, the accuracy of the image data reproducing the document is lower than that of the original document.

On the other hand, as described in the above-described conventional technology, an image reading apparatus including a light source and an imaging element that are opposed to each other with a document table interposed therebetween can accurately read a document. Depending on the light source, there are the following problems.

In the light source using a fluorescent tube, there is a problem that it takes time until the light quantity that can be read is stabilized after the light source is turned on. Further, when an irradiation area having a width that can irradiate the entire document is secured by a light source using a fluorescent tube, there is a problem that the light source becomes larger and the image reading apparatus becomes larger as the light source becomes larger.

In addition, with a light source using an LED, it is possible to read a document image immediately after lighting, and noise generation in image data can be reduced as compared with the case where a fluorescent tube is used.
Since the irradiation area per LED is limited, it is necessary to provide a plurality of LEDs in order to secure an irradiation area wide enough to irradiate the entire document. For this reason, the light source becomes larger and the light source becomes larger. There is a problem that the size of the image reading apparatus increases with the increase in size. In addition, when a plurality of LEDs are used in a single light source, there is a problem that the quality of image data is deteriorated due to variations in the amount of light for each LED.

As described above, in the image reading apparatus in which the light source is provided on the cover member, when either the fluorescent tube or the LED is used, the original is set when the cover member is enlarged with the enlargement of the light source. Therefore, there is a problem that the operation of moving the cover member is troublesome.

An image reading apparatus according to the present invention includes a light source provided on a cover member that is movable toward and away from a document table that holds a document, and an image sensor provided on the opposite side of the light source with the document table interposed therebetween. A light source moving mechanism that is provided on the cover member and moves the light source in the scanning direction, an image sensor moving mechanism that moves the image sensor in the scanning direction, and the image sensor moving mechanism. The light source moving mechanism and the image pickup device are configured to apply an attractive force between the light source moving mechanism and the image pickup device moving mechanism according to the position of the cover member with respect to the document table and the driving source that supplies the driving force to the document table. A coupling mechanism for coupling the element moving mechanism with each other, and
It is characterized by providing.

Therefore, in the image reading apparatus, the light source moving mechanism and the image sensor moving mechanism are connected by the attractive force acting between the light source moving mechanism and the image sensor moving mechanism according to the contact / separation state of the cover member, and the light source moving mechanism And the image sensor moving mechanism can be interlocked. by this,
The image reading apparatus can reduce the size of the image reading apparatus by sharing the drive source and reduce the power consumption due to the common drive source. In addition, this allows the user to easily connect the light source moving mechanism and the image sensor moving mechanism simply by moving the cover member to and away from the document table, and to link the light source and the image sensor with high accuracy. Image data can be obtained.

Further, the coupling mechanism in the above-described image reading apparatus can apply an attractive force that causes a slip between the light source moving mechanism and the imaging element moving mechanism when torque of a predetermined value or more is transmitted. It is characterized by that.

For example, the predetermined value is set to a value that is required for the movement of the light source by the light source movement mechanism and that does not cause damage to each part constituting the light source movement mechanism.

Therefore, in the image reading apparatus, only torque less than a predetermined value can be transmitted from the imaging element moving mechanism to the light source moving mechanism. As a result, among the light source and the image sensor that move by receiving the driving force from the same drive source, the load required for the movement of the light source is reduced by the weight reduction accompanying the downsizing with respect to the load required for the movement of the image sensor. Even in this case, the light source moving mechanism and the image sensor moving mechanism can be linked without causing damage to the light source or the light source moving mechanism. In addition, this allows the user to obtain highly accurate image data by linking the light source moving mechanism and the image sensor moving mechanism without learning a particular burden.

In addition, the above-described image reading apparatus includes a hinge portion that rotatably connects one end portion of the cover member and a main body housing that houses the imaging element, and the cover member is interposed between the main body through the hinge portion. It is characterized in that it can be moved toward and away from the document table by rotating with respect to the housing.

Therefore, in the image reading apparatus, the light source moving mechanism and the image sensor moving mechanism can be arbitrarily connected by rotating the cover member with the hinge portion as the rotation center. Accordingly, the image reading apparatus can rotate the cover member with the hinge portion as a fulcrum using the principle of leverage, and can reduce the burden on the user when the cover member contacts and separates from the document table. . This also allows the user to easily bring the cover member into and out of the document table and obtain highly accurate image data.

Further, the drive source in the image reading apparatus described above is provided in the main body housing.

Therefore, in the image reading apparatus, the weight of the cover member can be reduced. As a result, the image reading apparatus can reduce the burden on the user accompanying the rotation of the cover member. In addition, this allows the user to obtain highly accurate image data by rotating the cover member with a small burden and interlocking the light source moving mechanism and the image sensor moving mechanism.

Further, the drive source in the image reading apparatus described above may be provided on the cover member.

Therefore, in the image reading apparatus, the image sensor moving mechanism can be simplified in the main body housing. As a result, the image reading apparatus can prevent the image reading apparatus from being damaged due to heat generation due to the inside of the main body housing becoming overcrowded. This also allows the user to obtain highly accurate image data simply by using a small multifunction device with reduced power consumption and only moving the cover member to and away from the document table.

Further, the light source in the above-described image reading apparatus is constituted by an LED.

Therefore, the image reading apparatus can read a document immediately after lighting. As a result, the image reading apparatus can start reading a document quickly and improve the reading accuracy. Thus, the user can obtain highly accurate image data in the minimum necessary time. Further, in the image reading apparatus, the power consumption can be suppressed by using the LED as compared with the case where the fluorescent tube is used. As a result, the user can quickly obtain image data in which the image of the original is reproduced with high accuracy while suppressing the running cost.

According to another aspect of the present invention, there is provided a multifunction peripheral including: the above-described image reading apparatus; and an image forming apparatus that forms an image on a recording medium according to the intensity of light incident on an image sensor included in the image reading apparatus. It is characterized by providing.

Therefore, in the multifunction machine, the light source moving mechanism and the image sensor moving mechanism can be interlocked according to the contact / separation state of the cover member in the image forming apparatus. As a result, the multi-function device can reduce the size of the multi-function device by sharing the drive source and reduce power consumption due to the common use of the drive source. As a result, the user can obtain high-precision image data only by the operation of moving the cover member to and away from the document table using a small-sized multifunction machine with reduced power consumption.

(Embodiment 1)
Exemplary embodiments of an image reading apparatus according to the present invention will be explained below in detail with reference to the accompanying drawings. The first embodiment shows an application example to a scanner device that realizes the image reading device according to the present invention.

FIG. 1 is a perspective view illustrating an appearance of the scanner device according to the first embodiment. First, the appearance of the scanner device according to the first embodiment will be described with reference to FIG. As shown in FIG. 1, the scanner device 100 includes a main body unit 110 and a transmissive original light source unit (hereinafter referred to as “TPU unit”) 120.

The TPU unit 120 is disposed to face the main unit 110 and is connected to the main unit 110 via a hinge portion (see FIG. 3). The TPU unit 120 is connected to be pivotable in a direction away from the main unit 110 from the state shown in FIG.

FIG. 2 is a longitudinal front view of the scanner device 100 according to the first embodiment. Next, FIG.
The schematic configuration of the scanner device 100 according to the first embodiment will be described using FIG. As shown in FIG. 2, the scanner device 100 includes a main body housing 210 that forms an outline of the main body unit 110.
And a TPU housing 230 that forms an outline of the TPU unit 120.

The main body housing 210 and the TPU housing 230 are mainly formed of two parts that can be separated in the vertical direction. Although a special symbol is omitted, hereinafter,
The parts constituting the upper side of the main body housing 210 and the TPU housing 230 will be described as an upper main body housing and an upper TPU housing. Similarly, the parts constituting the lower side of the main body housing 210 and the TPU housing 230 will be described as a lower main body housing and a lower TPU housing.

First, a schematic configuration of the main unit 110 will be described. The main body housing 210 in the main body unit 110 has an opening 211 that opens toward the TPU housing 230.
It has. A document table glass 212 is provided at the opening 211 so as to close the opening 211.

In the first embodiment, a reading window is realized by the opening 211 and the original platen glass 212, and a frame member is realized by the periphery of the opening 211 in the main body housing 210. On the platen glass 212, a document to be read is placed.

In the space 213 formed by the main body housing 210 and the platen glass 212,
An optical member 214 is provided for optically reading an image of the document placed on the document table glass 212. The optical member 214 includes a reflection light source 215 that irradiates light toward the platen glass 212, and a plurality of mirrors 216 that guide the light emitted from the reflection light source 215 and reflected from the document to a predetermined path, and are guided by the mirror 216. Image sensor 217 that receives the emitted light
And a lens 218 for imaging the light guided by the mirror 216 on the image sensor 217.

As the image sensor 217, for example, a photodiode that photoelectrically converts an optical image formed on the light receiving surface and outputs an electrical signal corresponding to the amount of light received for each element can be used.
In the scanner device 100, the linear image sensor in which the above-described photodiodes are linearly arranged on the scanning circuit board 219 along the main scanning direction is an image sensor 217.
It is used as.

In the space 213, a scanner carriage 220 is provided. The scanner carriage 220 is provided to be slidable along a carriage guide 221 that is parallel to the document table glass 212 and extends in the sub-scanning direction.

A driving force generated by a motor 222 as a driving source is transmitted to the scanner carriage 220 via an imaging element moving mechanism 223 connected to the motor 222. As will be described later, the image sensor moving mechanism 223 is configured by a gear train coupled to the drive shaft of the motor 222, a drive belt 225 spanned between a gear constituting the gear train and the driven gear 224, and the like. (See FIG. 3). The scanner carriage 220 is connected to the drive belt 225.

In the scanner carriage 220, the driving force generated by the motor 222 is driven by the image sensor moving mechanism 2.
23 is transmitted through the original platen glass 212 and moved in the sub-scanning direction. The scanner carriage 220 reciprocates between a home position set at the end position on the side where document reading is started and a folding position set at a position where the document is read back toward the home position.

The optical member 214 described above is mounted on the scanner carriage 220. Optical member 2
14 moves in the sub-scanning direction along the platen glass 212 as the scanner carriage 220 moves.

Next, a schematic configuration of the TPU unit 120 will be described. The TPU housing 230 in the TPU unit 120 is provided with an opening 231 that opens toward the main body housing 210 on the side facing the main body housing 210. Further, the TPU housing 230 is provided with a protective mat 232 at a position covering the opening 231. The protective mat 232 is detachably attached to the TPU housing 230.

The TPU housing 230 is provided with a transmissive light source section (see FIG. 3) as a transmissive original light source. The transmissive light source unit is used when a light-transmissive original such as a photographic film is read, and irradiates light toward the original table glass 212. The light source unit for transmission is provided so as to be movable in the sub-scanning direction along the platen glass 212.

The TPU housing 230 is provided with a power transmission mechanism (see FIG. 3) that transmits the driving force of the motor 222 described above to the light source for transmission. Although detailed illustration and description are omitted, T
The power transmission mechanism provided in the PU unit 120 includes, for example, a pulley group coupled to the image sensor moving mechanism 223, a drive belt 233, and a gear pair on which the drive belt 233 is bridged (partly FIG. 3). reference).

In the first embodiment, the power transmission mechanism provided in the TPU housing 230 is connected to the motor 222 when the protective mat 232 is detached from the TPU housing 230, and the driving force of the motor 222 is used as the transmission light source unit. Configured to communicate. Thus, the transmissive light source unit moves along the sub-scanning direction together with the scanner carriage 220 under the driving force of the motor 222 only when the protective mat 232 is removed from the TPU housing 230.

The transmission light source unit 318 reciprocates between a home position set at the end position on the side where the irradiation of the document is started and a folding position set at a position where the document is turned back toward the home position after irradiation. . The folding position for the transmissive light source unit 318 is set to a position where a backlash in the configuration of each unit for moving the transmissive light source unit 318 can be corrected by performing a phase matching operation described later. Yes. Scanner device 100
, The distance between the home position and the folding position of the scanner carriage 220 is set to be longer than the distance between the home position and the folding position of the light source part 318 for transmission.

In the reading operation of a light transmission type original (hereinafter referred to as “film”) such as a film, on the original table glass 212, that is, the main unit 110 and the TPU unit 120.
A film folder 240 is installed between the two. The film folder 240 is a member that guides the installation position of the film and fixes the installed film at the reading position so that the film is installed at the reading position for the film on the platen glass 212.

FIG. 3 is a perspective view showing a partial cross section of the scanner device 100. In FIG. 3, TP
A state in which the upper TPU housing in the U housing 230 is removed and a part of the main body housing 210 is cut is shown. In FIG. 3, reference numeral 300 denotes a main unit 110 and a TPU.
It is a hinge part that connects the unit 120. Hereinafter, each part to which the driving force of the motor 222 is transmitted will be described with reference to FIG.

As shown in FIG. 3, the image sensor moving mechanism 223 provided in the main body housing 210 includes a gear 301 fixed to the drive shaft of the motor 222, and gear trains 302 to 3 connected to the gear 301.
06. A gear on which the above-described drive belt 225 is hung is provided on the shaft serving as the rotational axis of the gear 306.

The image sensor moving mechanism 223 uses the driving force generated by the motor 222 as the gears 301 to 301.
By transmitting to the drive belt 225 via 306, the drive belt 225 is rotated. Accordingly, the scanner carriage 220 connected to the drive belt 225 can be moved along the sub-scanning direction.

In addition, a pulley 307 having the rotation axis as the axis is provided on the axis serving as the rotation axis of the gear 306. A magnetic body 310 constituting a part of the coupling mechanism 309 is coupled to the pulley 307 via a plurality of pulley groups 308 that rotate as the pulley 307 rotates.
The magnetic body 310 rotates around an axis parallel to the axial direction of the pulley group 308 when the driving force of the motor 222 is transmitted through the pulley group 308.

The magnetic body 310 is disposed opposite to the magnetic body 313 provided on the TPU unit 120 side via openings 311 and 312 that open toward the TPU unit 120 side on the upper surface of the main body housing 210. The magnetic body 310 and the magnetic body 313 are connected so as to be separable by an attractive force that attracts each other. Here, pulley 307, pulley group 308, magnetic body 31
0, the openings 311 and 312 and the magnetic body 313 constitute a coupling mechanism 309. The magnetic body 313 is provided to be rotatable about an axis parallel to the axial direction of the magnetic body 310.

The magnetic bodies 310 and 313 constituting the coupling mechanism 309 may have a magnetic force that attracts each other, or at least one of them may have a magnetic force that attracts the other. When one of the magnetic bodies 310 or 313 has a magnetic force, the other is formed of a material having a property of being attracted by a magnetic force, such as iron.

The TPU housing 230 is provided with a pulley group 315 that connects one gear 314 and the magnetic body 313 in the gear pair on which the drive belt 233 described above is suspended. The other gear 316 in the gear pair rotates following the rotation of the drive belt 233. Gear 314
And the gear 316 are arranged to face each other along the sub-scanning direction.

The coupling mechanism 309 causes slippage between the magnetic body 310 and the magnetic body 313 when the torque transmitted from the image sensor moving mechanism 223 is larger than a predetermined value, and causes the pulley group 315 to generate a torque greater than a predetermined magnitude. It has a torque limiter function that does not transmit. Here, the torque having a predetermined magnitude is a torque required to move the light source for transmission.

Even when a torque of a predetermined magnitude or larger is transmitted by the torque limiter function in the coupling mechanism 309, the transmission light source unit such as the transmission light source unit, the pulley group 315, or the gear pair on which the drive belt 233 is suspended is used. It is possible to prevent breakage of each part related to movement.

Reference numeral 317 in FIG. 3 is a stay that supports shafts such as the magnetic body 313, pulleys constituting the pulley group 315, and gear 314. The magnetic body 313 is provided so as to be able to contact and separate from the stay 317 (see FIGS. 5 and 6). Thereby, the magnetic body 310 and the magnetic body 313 can be detachably meshed with each other.

Reference numeral 318 in FIG. 3 indicates the above-described transmission light source unit. The transmission light source unit 318 is coupled to the drive belt 233 at a fixing unit 319 provided in the transmission light source unit 318. As a result, the transmissive light source unit 318 moves along the sub-scanning direction as the drive belt 233 rotates.

The TPU housing 230 has a guide rail 3 extending along the sub-scanning direction at a position on the side of the drive belt 233 and overlapping the movement locus of the transmission light source unit 318.
20 is provided. A groove 321 provided at a position facing the guide rail 320 in the light source for transmission 318 is fitted into the guide rail 320. Thereby, the transmission light source unit 318 can be stably moved along the sub-scanning direction.

The light emitted from the transmission light source unit 318 is guided to the original platen glass 212 side through the opening 322 provided in the TPU housing 230. The opening 322 is a light source unit 31 for transmission.
8 is provided so as to cover the reading range of the film.

FIG. 4 is an exploded perspective view showing the transmissive light source unit 318. With reference to FIG. 4, the light source section 3 for transmission
The configuration of 18 will be described. As shown in FIG. 4, the transmissive light source unit 318 includes an LED 401.
And a light guide plate 402 for propagating the light emitted by the LED 401. The light guide plate 402 can irradiate an area wider than the irradiation area per LED. In FIG. 4, the imaginary line written on the light guide plate 402 indicates an effective light emitting area on the light guide plate 402.

Light propagated through the light guide plate 402 is irradiated toward the document table glass 212 from the opening 406 provided in the support frame 405 via the prism sheet 403 and the diffusion sheet 404. By passing through the prism sheet 403 and the diffusion sheet 404, it is possible to irradiate a wider area with the light propagated through the light guide plate 402.

In the light source unit 318 for transmission, on the side opposite to the opening 406 with the light guide plate 402 in between,
A reflection plate 407 that reflects the light propagated through the light guide plate 402 toward the opening 406 is provided. By providing the reflecting plate 407, the light propagated through the light guide plate 402 can be efficiently irradiated to the document table glass 212 side.

The fixing portion 319 described above is provided on the side of the support frame 405, and opens upward so as to sandwich the drive belt 233 from the document table glass 212 side.

FIG. 5 is an enlarged perspective view (part 1) showing the coupling mechanism 309, and FIG. 6 is an enlarged perspective view (part 2) showing the coupling mechanism 309. FIG. 5 shows a state in which the magnetic body 310 and the magnetic body 313 are coupled by a magnetic force. FIG. 6 shows a state where the magnetic body 310 and the magnetic body 313 are separated from each other.

As can be seen from FIGS. 5 and 6, the magnetic body 313 in the coupling mechanism 309 is provided with the stay 3
When it is separated from the magnetic body 310, it is connected to the magnetic body 310, and when it is located near the stay 317, the magnetic body 310 is separated. In the magnetic bodies 310 and 313, the surfaces facing each other are flat surfaces (see reference numeral 602). Accordingly, it is possible to secure a wide surface on which the attractive force is applied, and to reliably connect the magnetic body 310 and the magnetic body 313.

Although illustration is omitted, in addition to the configuration described above, the scanner device 100 includes an operation panel that accepts various instruction operations by the user, various control circuits that drive and control each unit in the scanner device 100, and instructions received by the operation panel. A control system for controlling various control circuits according to operations is provided. The operation panel accepts an instruction operation for reading an image of a document such as paper that does not transmit light (reflection-type document), an instruction operation for reading an image on a film, and the like.

In addition, although not illustrated, the scanner device 100 may include a communication I / F that performs communication with an external device such as a personal computer. In this case, the scanner device 100 receives a command corresponding to the instruction operation received by the personal computer via the communication I / F.

The scanner device 100 moves the scanner carriage 220 or reflects the light source 2 for reflection in accordance with an instruction operation received via the operation panel or a command received via the communication I / F.
15 and the transmission light source unit 318 are turned on / off, and image data is generated by photoelectrically converting light imaged on the image sensor 217. In the first embodiment, a function as an image data generation unit is realized by each unit involved in generating image data and various processes performed by each unit.

The scanner device 100 may store the generated image data in an arbitrary storage medium, or may transmit the generated image data to an external device such as a personal computer via a communication I / F. In the first embodiment, a function as an output unit is realized by each unit related to transmitting the generated image data to an external device and various processes performed by each unit.

When reading an image of a film by the scanner device 100 having such a configuration,
The user installs the film folder 240 on the platen glass 212 and installs the film at a predetermined position guided by the film folder 240. Further, the user removes the protective mat 232 from the TPU housing 230 before and after the installation of the film.

Subsequently, as shown in FIG. 1 or FIG.
10 to face. Thereby, the magnetic body 310 and the magnetic body 313 in the coupling mechanism 309 are engaged with each other, and the transmission light source unit 318 and the image sensor moving mechanism 223 are coupled.

Thereafter, the user performs an instruction operation for reading an image on the film. The instruction operation may be performed via an operation panel provided in the scanner device 100, or may be performed on an external device such as a personal computer.

When there is an instruction operation for reading an image on the film, the scanner device 100 includes the motor 22.
2 is driven and the amount of light received by the image sensor 217 is detected while moving the scanner carriage 220 and the light source for transmission 318 along the sub-scanning direction. Then, image data is generated based on the detected amount of received light.

Prior to the generation of the image data, the scanner device 100 may acquire various reference data serving as a black or white reference in the image data and perform shading correction of the image data using the acquired reference data. . Since the acquisition of the reference data and the shading correction using the acquired reference data are known techniques, description thereof is omitted here.

Further, the scanner device 100 performs a phase matching operation for correcting the relative positions of the image sensor 217 and the transmission light source unit 318 in the sub-scanning direction prior to the generation of image data. In the phase matching operation, first, in a state where the power transmission mechanism provided in the TPU unit 120 and the motor 222 are connected, the motor 222 is driven to move the scanner carriage 220 to the folding position.

As described above, in the scanner device 100, the distance between the home position and the folding position of the scanner carriage 220 is provided to be longer than the distance between the home position and the folding position of the transmissive light source unit 318. For this reason,
While the scanner carriage 220 moves to the folding position, the light source unit for transmission 318 is transmitted.
Hits the folding position for the transmissive light source unit 318.

When the motor 222 is further driven in this state, a slip occurs between the torque limiter function magnetic body 310 and the magnetic body 313 in the coupling mechanism 309, and the scanner carriage 220 is in a state where the light source unit 318 for transmission is positioned at the folding position. Only moves to the folding position.

Then, after the scanner carriage 220 is moved to the folding position, the motor 222 is further driven to move the scanner carriage 220 and the light source for transmission 318 from the folding position to the home position. When the scanner carriage 220 moves to the home position, the phase alignment operation between the light source for transmission 318 and the image sensor 217 is completed.

The movement of the scanner carriage 220 to the folding position or the home position can be detected by providing a sensor at a predetermined position. Since a sensor for detecting the position of the scanner carriage 220 and a technique for detecting the position of the scanner carriage 220 using the sensor are known techniques, the description thereof is omitted.

Further, even when the transmission light source unit 318 reaches the folding position for the transmission light source unit 318 before the scanner carriage 220 reaches the folding position for the scanner carriage 220, the torque limiter function magnetic body in the coupling mechanism 309 is used. 310 and magnetic body 31
3, and only the scanner carriage 220 moves to the folding position with the transmissive light source unit 318 positioned at the folding position.

As described above, according to the scanner device 100 of the first embodiment, the scanner carriage 220 on which the reflection light source 215 suitable for reading a reflection document and the transmission light source unit 318 suitable for reading a transmission document are provided. It can be moved by a single image sensor moving mechanism 223.

Thus, even when the scanner device 100 is configured to use the reflection light source 215 and the transmission light source unit 318 in accordance with the type of the original, the scanner carriage 220 and the transmission light source unit 318 are single-imaged. By causing the element moving mechanism 223 to move, an increase in manufacturing cost due to selectively using the reflection light source 215 and the transmission light source unit 318 depending on the type of document can be suppressed.

In addition, this allows the user to obtain image data that reproduces an image of the document with high accuracy regardless of the type of the document, using the scanner device 100 that suppresses an increase in manufacturing cost.

Further, according to the scanner device 100 of the first embodiment, when a torque of a predetermined value or more is transmitted, slippage occurs in the coupling mechanism 309, so that each part related to the movement of the transmission light source unit 318 is damaged. The light source moving mechanism 318 and the image sensor moving mechanism 223 can be interlocked. As a result, the user can obtain high-accuracy image data by interlocking the light source moving mechanism 318 and the image sensor moving mechanism 223 without learning a special burden.

In the first embodiment, the magnetic body 310 and the magnetic body 313 in the coupling mechanism 309 are transmitted when a torque of a predetermined value or more is transmitted from the imaging element moving mechanism 232 to each part related to the movement of the transmission light source unit 318. The torque limiter function is realized by causing a slip between the torque limiter and the torque limiter function. However, the realization of the torque limiter function is not limited to that using magnetic force.

Although not shown, for example, a pair of gears is provided instead of the magnetic body 310 and the magnetic body 313, and a torque of a predetermined value or more is applied to each part related to the movement of the transmission light source unit 318 from the imaging element moving mechanism 232. When transmitted, the torque limiter function may be realized by idling one of the pair of gears. Since a specific method for idling the gear when a torque equal to or greater than a predetermined value is transmitted is a known technique, description thereof is omitted here.

Further, according to the scanner device 100 of the first embodiment, the power consumption can be minimized by moving the transmissive light source unit 318 only when reading a film. This also allows the user to obtain image data that accurately reproduces the image of the document with the scanner device 100 with reduced power consumption, regardless of the type of document.

Further, according to the scanner device 100 of the first embodiment, the transmission light source unit 318 and the image sensor moving mechanism 232 can be connected only when the TPU unit 120 is disposed opposite to the document table glass 212. it can. As a result, the user can easily perform the film operation without causing a sense of incongruity or stress by simply performing the same operation as in the past, in which the TPU unit 120 is opposed to the platen glass 212 in order to place the film on the platen glass 212. Can be read.

Further, according to the scanner device 100 of the first embodiment, the motor 222 is connected to the TPU unit 1.
20, the weight of the TPU unit 120 can be reduced. As a result, the scanner device 100 can reduce the burden on the user due to the rotation of the TPU unit 120. This also allows the user to rotate the TPU unit 120 with a small burden.

In the first embodiment, the scanner apparatus 100 in which the motor 222 is provided in the TPU unit 120 has been described. However, the motor 222 may be provided in the TPU unit 120. In this case, in the scanner device 100, the image sensor moving mechanism 223 can be simplified in the main body housing 210.

Accordingly, the scanner device 100 can prevent the scanner device 100 from being damaged due to heat generation due to the inside of the main body housing 210 becoming overcrowded. This also allows the user to use a small multifunction device with reduced power consumption and to obtain highly accurate image data simply by moving the TPU unit 120 to and from the platen glass 212. Can do.

Further, according to the scanner device 100 of the first embodiment, the LE in the transmission light source unit 318 is LE.
Since D401 is used, the film reading operation can be started immediately after the LED 401 is turned on. Thereby, the scanner apparatus 100 can start the film reading operation quickly. This also allows the user to quickly obtain image data that accurately reproduces the image of the document regardless of the type of document.

The LED 401 generates less noise in the image data than when a fluorescent tube is used. As a result, the user can quickly obtain image data in which the image of the document is reproduced with higher accuracy regardless of the type of the document. In the scanner device 100, L
By using the ED 401, power consumption can be suppressed as compared with the case where a fluorescent tube is used. As a result, the user can quickly obtain image data in which the image of the original is reproduced with high accuracy while suppressing the running cost.

Further, the scanner device 100 according to the first embodiment can output image data obtained by accurately reproducing an image of a document to an external device such as a personal computer regardless of the type of the document. This also allows the user to use image data obtained by accurately reproducing the image of the document on an external device such as a personal computer, regardless of the type of document.

(Embodiment 2)
FIG. 7 is a perspective view illustrating an external appearance of the multifunction peripheral according to the second embodiment. Next, a preferred embodiment 2 of the multifunction machine according to the present invention will be described. The multi-function device 700 according to the second embodiment is
The scanner apparatus 100 described in the first embodiment, the printer 701 as an image forming apparatus that forms an image on a recording medium according to the intensity of light incident on the image sensor 217 included in the scanner apparatus 100, and It has.

The scanner device 100 and the printer 701 are connected to each other via a communication I / F (not shown) so that they can communicate with each other. The scanner device 100 outputs image data corresponding to the intensity of light incident on the image sensor 217 to the printer 701.

The printer 701 includes a printer engine that forms an image on a recording medium such as paper. Although illustration and description are omitted because it is a known technique, various methods such as an ink jet method, an electrostatic transfer method, and a sublimation transfer method can be applied as an image forming method in the printer engine.

In the multi-function device 700 having such a configuration, the printer 701 includes the scanner device 10.
Based on image data output from 0, an image is formed on a recording medium such as paper.

According to such a multi-function device 700, an image based on image data in which an image of a document is reproduced with high accuracy can be formed on a recording medium such as paper, regardless of the type of document. This also allows the user to obtain a recording medium on which an image based on image data that reproduces an image of the document with high accuracy is formed regardless of the type of the document.

FIG. 2 is a perspective view showing an appearance of the scanner device according to the first embodiment. 1 is a longitudinal front view of a scanner device according to a first embodiment; FIG. 3 is a perspective view showing a partial cross section of the scanner device. The disassembled perspective view which shows the light source part for transmission. The perspective view which expands and shows a connection mechanism (the 1). The perspective view which expands and shows a connection mechanism (the 2). FIG. 6 is a perspective view illustrating an appearance of a multifunction machine according to a second embodiment.

Explanation of symbols

DESCRIPTION OF SYMBOLS 100 Scanner apparatus, 120 TPU unit, 217 Image sensor, 222 Motor, 223 Image sensor movement mechanism, 309 Connection mechanism, 310, 313 Magnetic body, 318 Light source for transmission, 401 LED, 700 MFP, 701 Printer

Claims (7)

In an image reading apparatus, comprising: a light source provided on a cover member that is detachable with respect to a document table that holds a document; and an image sensor provided on the opposite side of the light source with the document table interposed therebetween.
A light source moving mechanism provided on the cover member for moving the light source in the scanning direction;
An image sensor moving mechanism for moving the image sensor in the scanning direction;
A driving source for supplying a driving force to the image sensor moving mechanism;
The light source moving mechanism and the image sensor moving mechanism are coupled to each other by applying an attractive force between the light source moving mechanism and the image sensor moving mechanism according to the position of the cover member with respect to the document table. A coupling mechanism;
An image reading apparatus comprising: 2. The coupling mechanism is capable of applying an attractive force having a magnitude that causes a slip between the light source moving mechanism and the image sensor moving mechanism when torque of a predetermined value or more is transmitted. The image reading apparatus described in 1. A hinge portion that rotatably connects one end of the cover member and a main body housing that houses the imaging element;
The image reading apparatus according to claim 1, wherein the cover member is configured to be movable toward and away from the document table by rotating with respect to the main body housing via the hinge portion. apparatus. The image reading apparatus according to claim 3, wherein the driving source is provided in the main body housing. The image reading apparatus according to claim 1, wherein the driving source is provided on the cover member. The image reading apparatus according to claim 1, wherein the light source includes an LED. An image reading apparatus according to any one of claims 1 to 6,
An image forming apparatus that forms an image on a recording medium according to the intensity of light incident on an image sensor provided in the image reading apparatus;
A multi-function machine comprising:

Images