JP4807672B2 - Document reader - Google Patents

Description

  The present invention relates to a document reading apparatus. More specifically, the present invention relates to a configuration for fixing a CCD substrate or the like in a reduction optical system original reading apparatus.

  2. Description of the Related Art Document reading apparatuses that employ a reading method called a reduction optical system have been known. In this type of document reading apparatus, the alignment operation of the CCD substrate is performed so that the light from the lens is appropriately imaged on the CCD (charge coupled device) at the time of assembling work or the like. Since this operation is a delicate operation requiring accuracy of several tens of microns, the operation efficiency is greatly affected by the CCD substrate fixing structure.

In this regard, Patent Document 1 discloses an image reading apparatus including a block for attaching a CCD substrate, a plurality of fasteners for positioning, and an elastic member for pressing the fasteners. In Patent Document 1, it is assumed that the position adjustment of the CCD substrate is facilitated by this configuration.
JP 11-205531 A

  However, since the configuration of Patent Document 1 includes a block, an elastic member, and the like, the structure for fixing the CCD substrate becomes complicated, making processing difficult and also disadvantageous in terms of cost. Further, since the pressing force of the elastic member is used for fixing each fastener, it is considered that sufficient fixing force may not be exhibited when compared with the case where the fastener is directly tightened with a screw.

  On the other hand, in order to make the structure for fixing the CCD substrate simple, a method for attaching the CCD substrate and the bracket to the frame of the image reading apparatus directly by screwing without using a complicated fixing structure as in Patent Document 1. Is also known. In this case, for example, a shim is sandwiched between the bracket and the frame, and positioning is performed by the number of shims. However, according to this method, it is necessary to remove the screw and change the number of shims when the positioning operation is performed again, so that the operation is complicated.

  If the CCD substrate is directly screwed to the frame as described above, depending on the material of the frame, a screw with a large thread pitch (feed amount) may be used to secure the screw fixing force. You may not get. In this case, fine adjustment when fixing the CCD substrate becomes difficult, and workability deteriorates. In particular, when a screw with a large feed amount is used, there is a problem in that the displacement is likely to occur when the final tightening is performed after the positioning of the substrate is completed, and the work needs to be redone.

  The present invention has been made in view of the above circumstances, and a main object of the present invention is to provide a document reading apparatus having a CCD substrate fixing structure that can be easily configured and can be easily positioned. is there.

Means and effects for solving the problems

  The problems to be solved by the present invention are as described above. Next, means for solving the problems and the effects thereof will be described.

According to an aspect of the present invention, a reduction optical system document reading apparatus having the following configuration is provided. That is, the document reading apparatus includes a frame, a first bracket, a second bracket, a CCD substrate, and a condenser lens. The first bracket is fixed to the frame by tightening screws . The second bracket, by fastening the small screw of the feeding amount than the screws that secure the first bracket to the frame is fixed to the first bracket. The CCD board implements the CCD sensor, by the first bracket tightening small screws of the feeding amount than the screws that secure the frame is fixed to the second bracket. The condenser lens, the frame being fixed to converge the light to the CCD sensor. Before Symbol first bracket and the second bracket is formed of a hard material than that of the frame.

  Thereby, the CCD substrate can be fixed to the frame by a fixing structure with a simple configuration. Further, since it is directly tightened with a screw, the CCD substrate can be fixed with a sufficient fixing force. Further, since the bracket is made of a material harder than the frame, the pitch of the screws can be made finer than when the bracket is screwed to the frame. Therefore, since a screw with a small feed amount can be used as compared with the case where the CCD substrate is directly screwed to the frame, it is possible to suppress positional deviation when the CCD substrate is fixed. This facilitates the alignment of the CCD substrate and improves the productivity.

  In the document reading apparatus, it is preferable that the frame is made of resin, and the first bracket and the second bracket are made of sheet metal.

  That is, in general, the frame is often made of resin in order to facilitate molding, but due to the nature of the resin, it is difficult to use a screw with a small feed amount. With this configuration, the CCD substrate can be fixed to the resin frame via a metal bracket, so that a screw with a smaller feed amount can be used as compared with the case where the resin frame is directly screwed. It can be used, and the positional deviation at the time of fixation can be suppressed. This facilitates the alignment of the CCD substrate and improves the productivity. Further, since the bracket is made of sheet metal, it is easier to process than a fixture having a complicated configuration, and the cost can be kept low. In addition, since it is not necessary to embed a metal member or the like in the resin frame in order to use a screw with a small feeding amount, for example, by insert molding of a female screw portion in a resin frame, the separation property is good and suitable from the viewpoint of recycling. .

In the document reading apparatus, the first bracket is attached to be parallel to the optical axis of the condenser lens, and the second bracket is attached to a surface parallel to the optical axis of the first bracket. It is preferable.

  As a result, the orientation of the second bracket is constrained using the surface of the first bracket, whereby the orientation of the CCD can be kept constant with respect to the optical axis. As a result, the CCD can be accurately positioned.

In the document reading apparatus , it is preferable that the second bracket is screwed to the first bracket through an elongated insertion hole .

  Thereby, the position of the second bracket can be shifted within the range of the long hole, so that the position can be adjusted. In addition, the second bracket can be moved in the longitudinal direction of the elongated hole, while the movement in the direction perpendicular to the longitudinal direction of the elongated hole can be restricted, so that positioning is facilitated.

In the document reading apparatus, the condenser lens, by an elastic member attached to the first bracket, which is preferably fixed to the frame.

  Thereby, compared with the case where the condensing lens is pressed and fixed by a rigid body, for example, an excessive force is not applied to the condensing lens, so that distortion of the condensing lens can be suppressed. Further, since the first bracket can be used not only for fixing the second bracket but also for fixing the condenser lens, the configuration is simplified.

  In the document reading apparatus, it is preferable that a light shielding portion for preventing disturbance light from entering the condenser lens is formed in the first bracket.

  Accordingly, it is possible to improve the image reading quality by preventing the influence of ambient light with a simple configuration.

  In the document reading apparatus, the frame, the first bracket, the second bracket, the CCD substrate, and the condenser lens may be configured to be disposed inside a housing of an automatic document feeder. it can.

  As a result, the CCD substrate can be accurately fixed to the frame in the automatic document feeder, and an improvement in image quality can be realized.

  In the document reading apparatus, the frame, the first bracket, the second bracket, the CCD substrate, and the condenser lens may be arranged in a flat bed type reading unit.

  As a result, the CCD substrate can be accurately fixed to the frame of the flat bed type reading unit, and the image quality can be improved.

  Preferred embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is an external perspective view of a copy facsimile multifunction peripheral (multifunction peripheral) 20 including an image scanner 10 as an original reading apparatus according to an embodiment of the present invention. FIG. 2 is a front sectional view of the image scanner device 10.

  As shown in FIG. 1, the copy facsimile multifunction machine 20 includes an image scanner device 10 that functions as a book scanner and an auto document feed scanner. The multifunction machine 20 includes an operation panel 77 for instructing the number of copies, a facsimile transmission destination, a document reading, and the like, a main body 78 including an image forming unit for forming an image on a sheet as a recording medium, and the sheet. And a paper feed cassette 79 for sequentially supplying the. The main body 78 includes a transmission / reception unit (not shown) for transmitting image data via a communication line.

  As shown in FIG. 2, the image scanner device 10 provided in the multifunction machine 20 includes a platen glass 22 and a document table cover 21. The document table cover 21 is provided with an automatic document feeder (auto document feeder, ADF) 25. In addition, the image scanner device 10 includes a first scanner unit 50 and a second scanner unit 60 for reading an image of a document. Each of the first scanner unit 50 and the second scanner unit 60 is configured as a scanner unit of a reduction optical system.

  When the image scanner device 10 is used as an auto document feed scanner, the ADF 25 transports originals one by one. The image on the front side (first side) of the document is read by the first scanner unit 50, and the image on the back side (second side) is read by the second scanner unit 60.

  On the other hand, when the image scanner device 10 is used as a book scanner, a user places a book document to be read on the platen glass 22 and presses the book document with the document table cover 21 so that the book document does not move. Fix it. In this state, the image of the original can be read by the first scanner unit 50 by the flat bed method.

  As shown in FIG. 2, the ADF 25 provided in the document table cover 21 includes a document tray 23 provided above the document table cover 21 and a discharge tray 24 provided below the document tray 23.

  As shown in FIG. 2, a curved document transport path 30 that connects the document tray 23 and the discharge tray 24 is formed inside the document table cover 21. With this configuration, the documents set on the document tray 23 are separated one by one, conveyed along the curved document conveyance path 30, and discharged to the discharge tray 24. An instruction to start reading a document can be given by the operation panel 77 shown in FIG.

  Next, the configuration of each part of the ADF 25 will be described in detail along the document conveyance path 30.

  As shown in FIG. 2, a pickup roller 31 is disposed at a location where the document is supplied from the document tray 23 to the document transport path 30. A separation roller 32 is provided on the downstream side of the pickup roller 31, and a counter roller 37 is disposed to face the separation roller 32. The pickup roller 31 feeds the uppermost document on the document tray 23 and conveys it toward the downstream separation roller 32. The separation roller 32 drives the document while niping it with the opposing roller 37 to separate the document one by one and further convey it downstream.

  On the downstream side of the separation roller 32, a registration roller 39 and a counter roller that is paired with the registration roller 39 are arranged. The registration roller 39, together with the opposing roller, temporarily stops and loosens the leading side of the document conveyed by the separation roller 32, and after a predetermined time, conveys it downstream while removing the slack. Thereby, the skew of the original is corrected.

  A plurality of conveying rollers 33, 34, and 35 are provided on the downstream side of the registration roller 39. In addition, rollers are disposed so as to face the transport rollers 33, 34, and 35, respectively. The document conveyed downstream by the driving of the registration roller 39 is nipped by the conveyance rollers 33, 34, and 35 and the rollers facing them, and further conveyed downstream.

  A first document reading position 80 is set between the two conveying rollers 34 and 35, and a document passing through the first document reading position 80 is scanned and read by a first scanner unit 50 described below. It is done. A platen roller 29 is disposed at the first document reading position 80.

  The first scanner unit 50 will be described. The first scanner unit 50 is disposed on the main body 78 side, and is disposed below the ADF 25 and the platen glass 22. The first scanner unit 50 includes a light source 51, reflection mirrors 52, 53, and 54, a condenser lens 55, and a CCD sensor 56. In the following description, the CCD sensor may be simply abbreviated as CCD.

  The CCD 56 is fixed to the resin main body side frame 76 via the first bracket 14 and the second bracket 15. The light source 51 irradiates light to the first document reading position 80 (or the platen glass 22) of the ADF 25, and the reflection mirrors 52, 53, and 54 reflect the reflected light from the document. The reflected light is converged by the condenser lens 55, and the converged light is configured to form an image at the CCD 56 portion.

  The light source 51 and the reflection mirror 52 of the first scanner unit 50 are configured to be movable. As described above, when the image scanner device 10 is used as a book scanner, the light source 51 and the reflection mirror 52 of the first scanner unit 50 are moved along the platen glass 22. As a result, the document placed on the platen glass 22 can be read.

  A case where the image scanner device 10 is used as an auto document feed scanner (when a document is read using the ADF 25) will be described. In this case, as shown in FIG. 2, the light source 51, the reflection mirror 52, and the like are moved to a position facing the first document reading position 80 and kept stationary. By driving the ADF 25 in this state, the first scanner unit 50 can scan and read the front side surface of the document that is transported through the document transport path 30 and passes the first document reading position 80.

  In the first scanner unit 50, the reflected light from the original is guided to the CCD 56 as described above to form an image, and the CCD 56 outputs an electrical signal corresponding to the image information of the original. This signal is appropriately converted and transmitted to the image forming unit provided in the multifunction device 20. Then, the transmitted image information is transferred to a sheet as a recording medium by the image forming unit, thereby realizing a copy function of the multifunction machine 20.

  In the document transport path 30, a second document reading position 90 is set on the downstream side of the first document reading position 80 (downstream of the transport roller 35). The back side of the document passing through the second document reading position 90 is scanned and read by a second scanner unit 60 described below.

  The second scanner unit 60 will be described. The second scanner unit 60 includes a resin scanner frame (frame) 12 that holds components and the like constituting an internal optical system. The scanner frame 12 is configured to cover the outside of the components of the second scanner unit 60.

  A part of the lower side of the scanner frame 12 and the discharge tray 24 is configured to be openable. This open part is normally covered with the lid part 13, whereby the second scanner unit 60 is kept sealed.

  A reading glass 42 for reading the back side of the document is provided at the bottom of the scanner frame 12. The reading glass 42 is disposed at a position corresponding to the second document reading position 90. The scanner frame 12 is provided with a counter discharge roller 40 at a position facing the discharge roller 36 provided on the ADF 25 main body side.

  The components of the second scanner unit 60 are disposed inside the scanner frame 12. Similar to the first scanner unit 50, the second scanner unit 60 includes a light source 61, reflecting mirrors 62, 63, 64, 65, a condenser lens 67, and a CCD 57.

  Similar to the CCD 56 of the first scanner unit 50, the CCD 57 is fixed to the resin scanner frame 12 via the first bracket 17 and the second bracket 18.

  The light source 61 irradiates the second original reading position 90 with light through the reading glass 42, and the reflected light from the original is reflected by the reflecting mirrors 62, 63, 64, 65 and further converged by the condenser lens 67. The image is formed on the CCD 57 portion. Similar to the CCD 56 in the first scanner unit 50, the CCD 57 outputs an electrical signal corresponding to the image information of the document. This signal is also appropriately converted and transmitted to the image forming unit provided in the multifunction machine 20.

  Further, a platen roller 38 is disposed in the ADF 25 main body so as to face the second document reading position 90 (the reading glass 42) of the scanner frame 12. With this configuration, when the original conveyed by the conveying roller 35 reaches the platen roller 38, the original is scanned and read while being conveyed by the platen roller 38.

  The document whose contents on both the front and back sides are read at the two document reading positions as described above is conveyed by the discharge roller 36 and discharged to the discharge tray 24. In this way, a so-called one-pass ADF 25 is configured, which allows double-sided reading by allowing a document to pass through the document transport path 30 only once.

  Next, a method for fixing the CCD 57 and the condenser lens 67 in the second scanner unit 60 will be described with reference to FIG. FIG. 3 is a perspective view of the second scanner unit 60 with the lid 13 removed. In FIG. 3, the second scanner unit 60 is drawn upside down in order to better show the inside of the second scanner unit 60 with the lid 13 removed and the lower side opened.

  As shown in FIG. 3, a condensing lens 67, a CCD 57, and a CCD substrate 58 on which the CCD 57 is mounted are disposed inside the scanner frame 12. In FIG. 3, the CCD 57 is mounted on the back surface of the CCD substrate 58 with respect to the paper surface, and is therefore indicated by a broken line. As described with reference to FIG. 2, the light source 61 and the reflection mirrors 62, 63, 64, 65 are also arranged inside the scanner frame 12, but are not shown in FIG. 3.

  The resin scanner frame 12 includes a resin fixed block 121 formed integrally therewith. On the fixed block 121, the first bracket 17 made of sheet metal is fixed by being tightened by, for example, a self-tapping screw 43.

  On the first bracket 17, the second bracket 18, which is also made of sheet metal, is fixed by being tightened by an adjusting screw 44. The adjustment screw 44 uses a screw having a small screw feed amount (for example, a JIS standard M3 screw) in order to accurately position the second bracket 18. In this regard, since the screw for fixing the first bracket 17 to the scanner frame 12 is not related to the adjustment of the position, a screw with a large feed amount (the self-tapping screw 43) is used. When screwing the scanner frame 12, which is a relatively soft material (resin), it is possible to use a screw having a large thread pitch, such as the self-tapping screw 43, even if the first bracket 17 is firmly tightened. This is advantageous in that the screw hole is not easily broken.

  Further, the CCD substrate 58 is fixed to the second bracket 18 by being tightened by the adjusting screw 45. The adjustment screw 45 also uses a screw with a small screw feed amount (for example, an M3 screw) in order to accurately position the CCD substrate 58.

  With the above configuration, the CCD 57 can be fixed on the scanner frame 12.

  Further, a flat plate spring (elastic member) 19 is screwed to the first bracket 17 by an adjustment screw 46. The plate spring 19 is configured to press the condensing lens 67 against the fixed block 121, thereby fixing the condensing lens 67. By adopting a configuration in which the elastic force of the leaf spring 19 is pressed in this way, the condensing lens 67 can be securely fixed and the stress at the time of pressing can be dispersed without concentrating on a part. The distortion of the condenser lens 67 can be prevented.

  Next, a detailed fixing method of the CCD 57 and the condenser lens 67 will be described with reference to FIG. FIG. 4 is an exploded perspective view showing a configuration for attaching the CCD substrate 58 to the scanner frame 12. In FIG. 4, as in FIG. 3, the scanner frame 12 and the mounting direction of each component with respect to the scanner frame 12 are depicted upside down.

  As shown in FIG. 4, a lens receiving portion 122 is formed on the fixed block 121 formed on the scanner frame 12. The lens receiving portion 122 is formed as a multi-sided concave portion in which a plurality of flat inner wall surfaces are connected to each other, and the inner wall surface is configured to be in contact with the outer peripheral surface of the condenser lens 67.

  A bracket mounting surface 123 is formed on the fixed block 121 so as to be parallel to the optical axis of the condenser lens 67. By attaching the first bracket 17 to the bracket attachment surface 123, the first bracket 17 and the second bracket 18 fixed to the first bracket 17 can be fixed parallel to the optical axis.

  In the first bracket 17, appropriate screw holes are formed in advance so that the adjusting screws 44 and 46 can be screwed and fixed as shown by the two-dot chain line arrows in the figure.

  The first bracket 17 is bent so that a part thereof is orthogonal to the optical axis of the condenser lens 67. In the bent portion, a rectangular through hole (light passage portion) 170 through which light incident on the condenser lens 67 passes is formed. Further, a portion around the through hole 170 is a light shielding portion 171 for shielding light. The light shielding portion 171 is for restricting the incidence of disturbance light to the condensing lens 67, and functions as a mechanical shading correction portion. In addition, since the rigidity of the first bracket 17 is improved by forming the bent portion, the positioning accuracy of the CCD substrate 58 is improved.

  Further, the first bracket 17 is formed with a lens housing hole 172 at a position corresponding to the lens receiving portion 122. The condensing lens 67 is disposed inside the lens housing hole 172 and is sandwiched between the leaf spring 19 on the upper side of the sheet of FIG. 4 and the lower lens receiving portion 122 so that the condensing lens 67 can be fixed. It is configured.

  The second bracket 18 is formed with a substrate mounting surface 182 configured such that a surface thereof is orthogonal to the optical axis of the condenser lens 67 by being partly bent. In addition, an appropriate screw hole is formed in advance in the board mounting surface 182 so that the adjustment screw 45 can be screwed and fixed as shown by a two-dot chain line arrow in the figure. By screwing the CCD substrate 58 to the substrate mounting surface 182, the CCD 57 can be appropriately arranged so as to be orthogonal to the optical axis.

  The second bracket 18 is formed with a long hole 181 through which an adjustment screw 44 for fixing to the first bracket 17 is inserted. The long hole 181 is elongated in a direction parallel to the optical axis of the condenser lens 67. Accordingly, when the second bracket 18 is attached to the first bracket 17 or the like, the second bracket 18 can be moved in a direction toward or away from the condenser lens 67 by loosening the adjustment screw 44.

  Thereby, the focus adjustment of the CCD 57 mounted on the CCD substrate 58 attached to the second bracket can be performed. Further, since the movement of the second bracket 18 in the direction orthogonal to the optical axis is restricted by the long hole 181 and the adjustment screw 44, the CCD 57 does not move in an unnecessary direction during the focus adjustment operation. Thereby, the focus adjustment work can be easily performed.

  An adjustment hole 581 through which the adjustment screw 45 for fixing to the second bracket 18 is inserted is formed in the CCD substrate 58. The adjustment hole 581 is configured as a round hole formed with a slightly larger diameter than the outer diameter of the screw portion of the adjustment screw 45, and a predetermined play is formed. Accordingly, when the CCD substrate 58 is attached to the second bracket 18 or the like, the adjustment screw 45 is loosened to move the CCD substrate 58 on the plane orthogonal to the optical axis of the condenser lens 67 by the amount of play. be able to. Thereby, the CCD 57 mounted on the CCD substrate 58 can be positioned in the main scanning direction and the sub-scanning direction.

  As described above, the image scanner device 10 according to the present embodiment includes the scanner frame 12, the first bracket 17, the second bracket 18, and the CCD substrate 58 in the second scanner unit 60 of the reduction optical system. And a condensing lens 67. The first bracket 17 is fixed to the scanner frame 12. The second bracket 18 is screwed to the first bracket 17. The CCD substrate 58 mounts the CCD 57 and is screwed to the second bracket 18. The condensing lens 67 converges the light on the CCD 57. The first bracket 17 and the second bracket 18 are made of sheet metal (that is, made of metal) that is harder than the scanner frame 12 (made of resin).

  As a result, the CCD substrate 58 can be fixed to the resin scanner frame 12 via the metal bracket, so that the adjustment screws 44 and 45 having a small feed amount can be used, and the positional deviation at the time of fixing can be suppressed. . This facilitates the alignment of the CCD substrate 58 and improves productivity. Further, since the bracket is made of sheet metal, it is easier to process than a fixture having a complicated configuration, and the cost can be kept low. Moreover, since it is the structure fixed by tightening of a screw, sufficient fixing force can be obtained. Furthermore, since it is not necessary to insert-mold the female screw portion in the scanner frame 12, it is also preferable from the viewpoint of recycling.

  In the image scanner device 10 of the present embodiment, the first bracket 17 is attached so as to be parallel to the optical axis, and the second bracket 18 is attached to a surface parallel to the optical axis of the first bracket 17. Yes.

  As a result, the orientation of the second bracket 18 is constrained using the surface of the first bracket 17, whereby the orientation of the CCD 57 can be kept constant with respect to the optical axis. As a result, the CCD 57 can be accurately positioned.

  Further, in the image scanner device 10 of the present embodiment, the first bracket 17 and the second bracket 18 are screwed through the long holes 181.

  Thereby, since the position of the 2nd bracket 18 can be shifted in the range of the long hole 181, the position can be adjusted. Further, since the second bracket 18 can be moved in the longitudinal direction of the long hole 181, the movement in the direction perpendicular to the longitudinal direction of the long hole 181 can be restricted, so that positioning is facilitated.

  Further, in the image scanner device 10 of the present embodiment, the condensing lens 67 is fixed by a leaf spring 19 attached to the first bracket 17.

  Thereby, compared with the case where the condensing lens 67 is pressed and fixed by a rigid body, for example, an excessive force is not applied to the condensing lens 67, so that distortion of the condensing lens 67 can be suppressed. Further, since the first bracket 17 can be used not only for fixing the second bracket 18 but also for fixing the condenser lens 67, the configuration becomes simple.

  Further, in the image scanner device 10 of the present embodiment, the first bracket 17 is formed with a light shielding portion 171 for preventing ambient light from entering the condenser lens 67.

  Accordingly, it is possible to improve the image reading quality by preventing the influence of ambient light with a simple configuration.

  Further, in the image scanner device 10 of the present embodiment, the scanner frame 12, the first bracket 17, the second bracket 18, the CCD 57, and the condenser lens 67 of the second scanner unit 60 are disposed inside the casing of the ADF 25. ing.

  As a result, the CCD substrate 58 can be accurately fixed to the scanner frame 12 inside the housing of the ADF 25, and an improvement in image quality can be realized.

  3 and 4 is for the second scanner unit 60 in the ADF 25, but in the present embodiment, the first scanner unit 50 is also made of two sheet metals in the same manner as described above. The CCD 56 is fixed via the bracket. Specifically, the first bracket 14 is fixed to the main body side frame 76 provided in the first scanner unit 50, and the second bracket 15 is screwed to the first bracket 14. The CCD substrate on which the CCD 56 is mounted is screwed to the second bracket 15.

  As described above, by using the same configuration for fixing the CCD in the first scanner unit 50 and the second scanner unit 60, it is possible to reduce the cost by sharing the components.

  As described above, in the image scanner device 10 of the present embodiment, the main body side frame 76, the first bracket 14, the second bracket 15, the CCD 56, and the condenser lens 55 are the flatbed first scanner unit 50. Is arranged.

  As a result, the CCD substrate can be fixed with high accuracy to the main body side frame 76 of the first scanner unit 50 of the flat bed system, and an improvement in image quality can be realized.

  Although the preferred embodiment of the present invention has been described above, the above configuration can be changed as follows, for example.

  The light shielding part 171 can be omitted. Further, instead of the configuration in which the light shielding portion 171 is formed integrally with the first bracket 17, the light shielding portion 171 may be formed on a member different from the first bracket 17. However, it is preferable to form the light shielding portion 171 in the first bracket 17 from the viewpoint of preventing the influence of ambient light with a simple configuration.

  The method of fixing the first bracket 17 to the fixing block 121 is not limited to the self-tapping screw 43, and may be fixed with an adhesive, for example. This is because the first bracket 17 does not need to be moved when the CCD substrate is aligned. However, from the viewpoint of improving the recyclability, it is preferable that it can be easily separated from the scanner frame 12 by screwing.

  The first scanner unit 50 and the second scanner unit 60 may use different shaped brackets. However, it is preferable to use brackets having the same shape from the viewpoint of reducing the cost by sharing parts.

  In the above embodiment, the first bracket and the second bracket are sheet metal (made of metal), but the present invention is not limited to this configuration. In other words, if the first bracket and the second bracket are formed of a material that is harder than the frame, it is possible to use a screw that has a smaller feed amount than when screwed directly to the frame. Therefore, for example, the first and second brackets may be made of a hard resin that is harder than the resin constituting the frame.

  For example, the image scanner device 10 of the above-described embodiment can be applied to a copy machine, a facsimile machine, and the like instead of the copy facsimile multifunction machine 20.

  In the above embodiment, the image scanner device 10 is provided as a part of the multi-function device 20, but instead of this configuration, it can be configured as a single image scanner device.

1 is an external perspective view showing a state of a copy facsimile multifunction peripheral according to an embodiment of the present invention. 1 is a front cross-sectional view illustrating a configuration of an image scanner device according to an embodiment. The perspective view which showed the mode inside the 2nd scanner unit. FIG. 3 is an exploded perspective view showing a configuration for attaching a CCD substrate to a scanner frame.

Explanation of symbols

10 Image scanner device 12 Scanner frame (frame)
17 1st bracket 18 2nd bracket 19 Leaf spring (elastic member)
20 Copy facsimile machine 25 Automatic document feeder 50 First scanner unit 57 CCD (CCD sensor)
58 CCD substrate 60 Second scanner unit 67 Condensing lens

Claims (8)

Frame,
A first bracket fixed to the frame by tightening screws ;
A second bracket fixed to the first bracket by tightening a screw having a smaller feed amount than the screw fixing the first bracket to the frame ;
Implement CCD sensor, by the first bracket tightening small screws of the feeding amount than the screws that secure the frame, and the CCD substrate fixed to the second bracket,
Is fixed to the frame, a condenser lens for converging the light to the CCD sensor,
With
The document reading apparatus of a reduction optical system, wherein the first bracket and the second bracket are made of a material harder than the frame. The document reading device according to claim 1,
The frame is made of resin;
The document reading apparatus, wherein the first bracket and the second bracket are made of sheet metal. The document reading device according to claim 1 or 2,
The first bracket is fixed to the frame so as to be parallel to the optical axis of the condenser lens ,
The document reading apparatus, wherein the second bracket is attached to a surface parallel to the optical axis of the first bracket. A document reading apparatus according to any one of claims 1 to 3,
The document reading apparatus , wherein the second bracket is screwed to the first bracket through an elongated insertion hole. The document reading device according to any one of claims 1 to 4,
The condensing lens by an elastic member attached to the first bracket, the document reading apparatus characterized by being fixed to the frame. A document reading apparatus according to any one of claims 1 to 5,
The document reading apparatus according to claim 1, wherein the first bracket is formed with a light shielding portion for preventing disturbance light from entering the condenser lens. The document reading device according to any one of claims 1 to 6,
The document reading apparatus, wherein the frame, the first bracket, the second bracket, the CCD substrate, and the condenser lens are disposed inside a housing of an automatic document feeder. The document reading device according to any one of claims 1 to 6 ,
The document reading apparatus, wherein the frame, the first bracket, the second bracket, the CCD substrate, and the condenser lens are arranged in a flat bed type reading unit.

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