JP7439582B2 - Manufacturing method of reading device - Google Patents

Description

The present invention relates to a method for manufacturing a reading device.

Patent Document 1 discloses an image reading optical system unit including a first optical member, a diaphragm, and a second optical member arranged along the optical axis, the first optical member, the diaphragm, and the second optical member being arranged along the optical axis. The member is made up of optical elements arranged in an array on a straight line perpendicular to the optical axis, and is equipped with a plurality of positioning means, the one closest to the center line or the one on the center axis among the plurality of positioning means. An image reading optical system unit is described in which the image reading optical system unit has a shape that restricts displacement in the longitudinal direction, and other shapes that allow displacement in the longitudinal direction.

JP2012-217128A

The reading device includes a light-shielding member formed with a plurality of through holes through which light reflected from a document passes, and an optical member formed with a plurality of lenses facing each of the holes, through which the light passing through the holes passes. and a substrate having a light receiving element that receives light that has passed through the optical member. Further, the reading device includes a housing to which the light shielding member and the optical member are fixed.

In such a configuration, when positioning the light shielding member with respect to the housing to which the optical member is fixed, positioning shapes formed on the light shielding member and the housing are used to position the light shielding member relative to the housing. I was positioning. However, when positioning the light shielding member with respect to the casing using the positioning shape in this way, the lens of the optical member fixed to the casing may The relative positional accuracy between the light shielding member and the hole of the light shielding member becomes low.

The problem of the present invention is that compared to the case where a light shielding member is positioned using a positioning shape with respect to a housing to which an optical member is fixed, the distance between the lens of an optical member fixed to a housing and the hole of a light shielding member is The objective is to increase relative positional accuracy.

A method for manufacturing a reading device according to a first aspect of the present invention includes: a substrate having a plurality of light receiving elements; an optical member through which a plurality of lenses are formed, into which light received by the light receiving elements is incident; and through which the light passes; is fixed, a light shielding member in which a plurality of holes are formed is placed opposite to the optical member, and the amount of light that enters the lens through the holes and passes through the optical member is measured by the received light. The method is characterized in that the light shielding member is moved while measuring with the element, and the light shielding member is fixed to the housing or the optical member.

A method of manufacturing a reading device according to a second aspect of the present invention is the method of manufacturing a reading device according to the first aspect, wherein the light shielding member extends in one direction and includes a plurality of light shielding parts arranged in the one direction. A plurality of holes are formed in the light shielding portion, and the light shielding portions are fixed to the housing or the optical member one by one by irradiating the light shielding portions with light.

The method for manufacturing a reading device according to a third aspect of the present invention is the method for manufacturing a reading device according to the second aspect, in which the light shielding portion is located at a position corresponding to a portion of the optical member where the distance between adjacent lenses is the narrowest. is first fixed to the housing or the optical member.

A method for manufacturing a reading device according to a fourth aspect of the present invention is a method for manufacturing a reading device according to the second or third aspect, in which light is irradiated to the light shielding portion and the optical member is passed through the hole. When moving the light blocking section while measuring the amount of light that has passed through the light receiving element, the light blocking section is moved in the one direction, and the average value of the light amount measured by all the light receiving elements is equal to or greater than a reference value. It is characterized by:

A method for manufacturing a reading device according to a fifth aspect of the present invention is a method for manufacturing a reading device according to the fourth aspect, in which the average amount of light measured by the light receiving element is set to be equal to or higher than a reference value. The light shielding section is moved in a cross direction that intersects the light receiving element, and the difference between the maximum value and the minimum value of the amount of light measured by the light receiving element is set to be equal to or less than a reference value.

According to the method for manufacturing a reading device of the first aspect of the present invention, compared to the case where the light shielding member is positioned using a positioning shape with respect to the housing to which the optical member is fixed, The relative positional accuracy between the lens of the member and the hole of the light shielding member can be increased.

According to the method of manufacturing a reading device according to the second aspect of the present invention, the optical member fixed to the housing is The relative positional accuracy between the lens of the member and the hole of the light shielding part can be increased.

According to the method for manufacturing a reading device according to the third aspect of the present invention, compared to the case where the plurality of light shielding parts are fixed to the housing or the optical member regardless of the distance between adjacent lenses of the optical member, Alternatively, it is possible to prevent all the light shielding parts from being unable to be fixed to the optical member.

According to the method for manufacturing a reading device according to the third aspect of the present invention, compared to the case where the plurality of light shielding parts are fixed to the housing or the optical member regardless of the distance between adjacent lenses of the optical member, Alternatively, it is possible to prevent all the light shielding parts from being unable to be fixed to the optical member.

According to the method of manufacturing a reading device according to the fourth aspect of the present invention, the light shielding portion may be moved in a meandering manner in one direction to make the average value of the light amount measured by all the light receiving elements equal to or greater than the reference value. In comparison, the average value of the amount of light measured by all the light receiving elements can be made equal to or higher than the reference value in a short time.

According to the method for manufacturing a reading device according to the fifth aspect of the present invention, the difference between the maximum value and the minimum value of the amount of light measured by the light receiving element is set to the reference value, compared to the case where the light shielding part is moved only in one direction. It can be as follows.

1 is a configuration diagram showing an image forming apparatus including a reading device manufactured by a reading device manufacturing method according to a first embodiment of the present invention. 1 is a configuration diagram showing an image reading unit including a reading device manufactured by a reading device manufacturing method according to a first embodiment of the present invention. FIG. 1 is an enlarged perspective view showing a reading device and the like manufactured by the reading device manufacturing method according to the first embodiment of the present invention. 1 is a perspective view showing a reading device and the like manufactured by a reading device manufacturing method according to a first embodiment of the present invention. FIG. 3 is a cross-sectional view showing a sliding member of a reading device manufactured by the reading device manufacturing method according to the first embodiment of the present invention. FIG. 2 is an operational diagram showing an image reading unit including a reading device manufactured by the reading device manufacturing method according to the first embodiment of the present invention. FIG. 1 is a perspective view showing a reading device manufactured by a reading device manufacturing method according to a first embodiment of the present invention. FIG. 1 is an exploded perspective view showing a reading device manufactured by a reading device manufacturing method according to a first embodiment of the present invention. 1 is a cross-sectional view showing a reading device manufactured by a reading device manufacturing method according to a first embodiment of the present invention. 1 is a cross-sectional view showing a reading device manufactured by a reading device manufacturing method according to a first embodiment of the present invention. FIG. 1 is an enlarged sectional view showing a reading device manufactured by the reading device manufacturing method according to the first embodiment of the present invention. FIG. 2 is an enlarged perspective view showing a lens array included in a reading device manufactured by the reading device manufacturing method according to the first embodiment of the present invention. FIG. 2 is an exploded perspective view showing a lens array and a light shielding member included in the reading device manufactured by the reading device manufacturing method according to the first embodiment of the present invention. FIG. 2 is a plan view showing a lens array included in a reading device manufactured by the reading device manufacturing method according to the first embodiment of the present invention. FIG. 1 is an enlarged cross-sectional view showing a lens array of a reading device manufactured by the reading device manufacturing method according to the first embodiment of the present invention. FIG. 2 is a perspective view showing a lens array and a light shielding member included in the reading device manufactured by the reading device manufacturing method according to the first embodiment of the present invention. FIG. 3 is a plan view showing a lens array and a light shielding member included in the reading device manufactured by the reading device manufacturing method according to the first embodiment of the present invention. FIG. 2 is a plan view showing a light shielding member included in the reading device manufactured by the reading device manufacturing method according to the first embodiment of the present invention. FIG. 3 is an enlarged plan view showing a light shielding member included in the reading device manufactured by the reading device manufacturing method according to the first embodiment of the present invention. FIG. 2 is a plan view showing a light shielding part provided in a light shielding member of a reading device manufactured by the reading device manufacturing method according to the first embodiment of the present invention. FIG. 2 is a perspective view showing an end of a light shielding part provided in a light shielding member of a reading device manufactured by the method for manufacturing a reading device according to the first embodiment of the present invention. FIG. 2 is a perspective view showing a light shielding part provided in a light shielding member of a reading device manufactured by the reading device manufacturing method according to the first embodiment of the present invention. (A) and (B) are a plan view and a cross-sectional view showing an end of a light shielding part provided in a light shielding member of a reading device manufactured by the reading device manufacturing method according to the first embodiment of the present invention. FIG. 2 is an enlarged cross-sectional view showing a lens array and a light shielding member included in the reading device manufactured by the reading device manufacturing method according to the first embodiment of the present invention. FIG. 1 is a cross-sectional view used to explain a method of manufacturing a reading device according to a first embodiment of the present invention. FIG. 1 is a cross-sectional view used to explain a method of manufacturing a reading device according to a first embodiment of the present invention. FIG. 1 is a cross-sectional view used to explain a method of manufacturing a reading device according to a first embodiment of the present invention. FIG. 2 is an explanatory diagram used to explain a method of manufacturing a reading device according to a first embodiment of the present invention. FIG. 2 is an explanatory diagram used to explain a method of manufacturing a reading device according to a comparative example of the first embodiment of the present invention. FIG. 2 is an enlarged perspective view showing a casing used in a method of manufacturing a reading device according to a comparative example of the first embodiment of the present invention. FIG. 2 is a perspective view showing a light shielding part used in a method of manufacturing a reading device according to a comparative example with respect to the first embodiment of the present invention. FIG. 2 is an explanatory diagram used to explain a method of manufacturing a reading device according to a comparative example of the first embodiment of the present invention. FIG. 3 is a cross-sectional view used to explain a method of manufacturing a reading device according to a modification of the method of manufacturing a reading device according to the first embodiment of the present invention. FIG. 2 is an explanatory diagram used to explain a method of manufacturing a reading device according to a first embodiment of the present invention.

<First embodiment>
An example of a method for manufacturing a reading device according to a first embodiment of the present invention, a reading device manufactured by this method for manufacturing a reading device, and an image forming apparatus equipped with this reading device will be described with reference to FIGS. 1 to 34. Note that arrow H shown in the figure indicates the vertical direction (vertical direction) of the device, arrow W indicates the width direction (horizontal direction) of the device, and arrow D indicates the depth direction (horizontal direction) of the device.

(Configuration of image forming apparatus)
As shown in FIG. 1, the image forming apparatus 10 according to the present embodiment includes a storage section 14 in which a sheet member P as a recording medium is stored from the bottom to the top in the vertical direction of the device (direction of arrow H). , a conveyance section 16 that conveys the sheet member P stored in the storage section 14; an image forming section 20 that forms an image on the sheet member P conveyed from the storage section 14 by the conveyance section 16; An image reading unit 60 for reading the captured image is provided in this order.

[Accommodation section 14]
The storage section 14 includes a storage member 26 that can be pulled out from the housing 10a of the image forming apparatus 10 toward the front side in the depth direction of the apparatus, and sheet members P are stacked on this storage member 26. Furthermore, the storage section 14 is equipped with a delivery roll 30 that sends out the uppermost sheet member P loaded on the storage member 26 to the sheet member P conveyance path 28.

[Transport section 16]
The conveyance unit 16 is equipped with a plurality of conveyance rolls 32 that convey the sheet member P along the conveyance path 28.

[Image forming section 20]
The image forming section 20 includes four image forming units 18Y, 18M, 18C, and 18K of yellow (Y), magenta (M), cyan (C), and black (K). In the following description, Y, M, C, and K may be omitted when there is no need to explain them separately.

The image forming units 18 of each color can be attached to and detached from the housing 10a. The image forming unit 18 for each color includes an image carrier 36, a charging roll 38 that charges the surface of the image carrier 36, and an exposure device 42 that irradiates the charged image carrier 36 with exposure light. It is being Further, the image forming unit 18 for each color includes a developing device 40 that develops the electrostatic latent image formed by exposing the charged image carrier 36 by the aforementioned exposure device 42 and visualizes it as a toner image. It is equipped.

The image forming unit 20 also includes an endless transfer belt 22 that rotates in the direction of arrow A in the figure, and a primary transfer roll 44 that transfers toner images formed by the image forming units 18 of each color to the transfer belt 22. It is equipped. Further, the image forming section 20 includes a secondary transfer roll 46 that transfers the toner image transferred to the transfer belt 22 onto the sheet member P, and a secondary transfer roll 46 that transfers the toner image transferred to the transfer belt 22 onto the sheet member P, and a toner image that is heated and pressurized to the sheet member P to which the toner image has been transferred. A fixing device 50 for fixing onto the sheet member P is provided. The secondary transfer roll 46 is an example of a transfer device.

[Image reading unit 60]
As shown in FIG. 2, the image reading unit 60 includes a first transparent plate 62 (=platen glass) on which the original G is placed when reading an image of one original G, and a device width of the first transparent plate 62. A second transparent plate 72 is provided on one side of the direction (left side in the figure). The first transparent plate 62 and the second transparent plate 72 are fitted into the upper part of the casing 60a of the image reading unit 60.

An opening/closing cover 66 that opens and closes the first transparent plate 62 and the second transparent plate 72 is arranged above the first transparent plate 62 and the second transparent plate 72. Inside the opening/closing cover 66, a conveying device 64 ( = ADF device) is provided.

Further, inside the housing 60a, a reading device 100 is provided that reads an image of the document G placed on the first transparent plate 62 and an image of the document G conveyed to the document reading position R by the conveyance device 64. ing. Further, the image reading unit 60 includes a drive device 74 that drives the reading device 100 in the width direction of the device. Note that details of the reading device 100 will be described later.

As shown in FIGS. 2 and 3, the drive device 74 is attached to a shaft 76 extending in the device width direction (=moving direction of the reading device 100) and to the lower surface of the casing 114 of the reading device 100, and is attached to the shaft 76. A sliding member 78 is slidably supported.

Furthermore, the drive device 74 includes a motor 80 , a drive pulley 84 that is rotated by a driving force transmitted from the motor 80 , a driven pulley 86 that is rotated by the drive, and an endless loop that is wound around the drive pulley 84 and the driven pulley 86 . It is equipped with an endless belt 82 having a shape. The driving pulley 84 is attached to one end of the shaft 76, and the driven pulley 86 is attached to the other end of the shaft 76.

As shown in FIG. 4, the sliding member 78 is attached to a central portion of the lower surface of the housing 114 in the depth direction of the device. As shown in FIG. 5, this sliding member 78 has a slit 78a that extends in the vertical direction of the device and into which a part of the endless belt 82 is fitted, and a slit 78a that is semicircular when viewed from the width direction of the device and that is connected to the shaft 76. A sliding surface 78b that slides is formed.

Furthermore, as shown in FIG. 4, a pair of support parts 90 that support both end portions of the shaft 76 from below are formed integrally with the housing 60a.

(Function of image forming device)
In the image forming apparatus 10, an image is formed in the following manner.

First, the image reading unit 60 shown in FIG. 6 reads the image of the document G. Specifically, when reading the image of the document G conveyed by the conveyance device 64, the reading device 100 transmits the driving force of the motor 80 (see FIG. 4) via the endless belt 82, and scans the image in the width direction of the device. It moves to the conveyance reading position on the end side and stops. Then, the reading device 100 placed at the conveyance reading position reads the image of the document G conveyed by the conveyance device 64.

On the other hand, when reading the image of the document G placed on the first transparent plate 62, as shown in FIG. While reading the image of the document G, moves in the width direction of the apparatus along the first transparent plate 62 toward the reading end position (=the position indicated by the two-dot chain line in the figure). Thereby, the reading device 100 reads the image of the document G placed on the first transparent plate 62.

(Configuration of reading device 100)
Next, the reading device 100 will be explained.
A reading device 100 shown in FIG. 7 reads an image formed on a document G using a known CIS (Contact Image Sensor) method. As shown in FIG. 8, the reading device 100 includes a light-receiving board 102, a pair of wiring cables 104 connected to the light-receiving board 102, a rigid board 106 connected to the wiring cables 104, and a rigid The light emitting device 128 is mounted on the substrate 106. Furthermore, the reading device 100 includes a pair of cylindrical light guides 110 (=light guides), a light collecting section 112 that collects light reflected from the original G (=reflected light), and a housing 114. It is equipped with The light receiving substrate 102 is an example of a substrate.

[Housing 114]
As shown in FIG. 8, the housing 114 has a box shape extending in the depth direction of the device. As shown in FIG. 9, the housing 114 has a pair of light guide housing parts 114a each housing a pair of light guide bodies 110, and a space between the pair of light guide housing parts 114a. A lens accommodating section 114b in which the light condensing section 112 is accommodated is formed. Furthermore, a pair of board accommodating parts 114c in which the rigid substrate 106 is housed are formed in the casing 114 so as to sandwich the light guide accommodating part 114a from the depth direction of the device, as shown in FIG. .

-Light guide housing section 114a-
As shown in FIGS. 9 and 10, the light guide accommodating portions 114a are formed in a pair along the width direction of the device, and each light guide accommodating portion 114a extends in the depth direction of the device. Further, a cross section of each light guide housing portion 114a that intersects with the longitudinal direction is semicircular with an upper opening.

-Lens housing section 114b-
As shown in FIG. 9, the lens housing portion 114b is formed between the pair of light guide housing portions 114a in the device width direction, and penetrates the housing 114 in the device vertical direction.

- Board housing section 114c -
As shown in FIG. 10, the substrate accommodating parts 114c are formed in pairs on the back side and the front side in the depth direction of the apparatus with respect to the light guide accommodating part 114a. Specifically, the substrate accommodating portion 114c is formed between the wall portions 119 at both ends of the casing 114 in the device depth direction and the light guide accommodating portion 114a.

-others-
As shown in FIG. 9, a stepped surface 117 is formed at the bottom of the housing 114, and is in contact with the upper surface of the edge of the light receiving substrate 102.

[Light guide 110]
As shown in FIG. 9, the light guide 110 is housed in a light guide accommodating portion 114a of the housing 114, and is formed of a transparent material (for example, acrylic resin) into a cylindrical shape extending in the depth direction of the device. has been done. A pair of light guides 110 are provided side by side in the device width direction.

The light guide 110 is expandable and retractable in the depth direction of the device, and its longitudinal center portion is fixed to the housing 114 by a fixing portion (not shown). When the light guide 110 is fixed to the casing 114, the end surface 110a of the light guide 110 and the wall 119 of the casing 114 are separated from each other in the depth direction of the device, and this separated portion is It is made into the board|substrate accommodating part 114c (refer FIG. 10).

Further, the light guide 110 allows the light incident from the end surface 110a of the light guide 110 to travel in the longitudinal direction, and also causes the light to be emitted upward toward the light condensing section 112 (in the direction of arrow B in FIG. 9). A reflecting member (not shown) is provided.

[Light condensing section 112]
As shown in FIG. 9, the light condensing section 112 is housed in a lens accommodating section 114b of the housing 114, and the light condensing section 112 includes a light shielding member 150 and a pair of lens arrays 152. Note that details of the pair of lens arrays 152 and the light shielding member 150 will be described later.

[Light receiving board 102]
As shown in FIG. 9, the light-receiving board 102 is arranged at the lower end of the casing 114, with the board thickness direction being the vertical direction of the device. The light-receiving board 102 is fixed to the casing 114 by a fixing means (not shown) with the upper surface of the edge of the light-receiving board 102 in contact with the step surface 117 of the casing 114.

The light receiving board 102 has a rectangular shape extending in the depth direction of the device when viewed from above. Further, on the upper surface of the light receiving board 102, a plurality of light receiving elements 126 are provided (=mounted) in line in the depth direction of the device. Further, the light receiving element 126 provided on the light receiving substrate 102 faces the light condensing section 112 in the vertical direction of the device. The light receiving element 126 is an example of an element.

[Wiring cable 104]
A pair of wiring cables 104 are provided, and as shown in FIG. 8, they are so-called flexible flat cables whose base ends are connected to both ends of the light receiving board 102 in the device depth direction. The base end of one wiring cable 104 is connected to the end of the light receiving board 102 on the back side (left side in the figure) in the device depth direction, and the base end of the other wiring cable 104 is connected to the end of the light receiving board 102 on the back side in the device depth direction. It is connected to the end on the near side of the direction (right side in the figure).

[Rigid substrate 106]
A pair of rigid substrates 106 are provided, and as shown in FIG. 8, they are connected to the tip of the wiring cable 104, and have a rectangular shape extending in the width direction of the device when viewed from the depth direction of the device. Further, one surface (=surface facing each other) of each rigid substrate 106 is provided with two LEDs (Light Emitting Diodes) 128 (hereinafter referred to as "light emitting elements 128") arranged in the width direction of the device.

The light emitting element 128 provided on the rigid substrate 106 is accommodated in the substrate accommodating portion 114c of the casing 114, facing the end surface 110a of the light guide 110, as shown in FIG.

(Function of reading device 100)
Next, the operation of the reading device 100 will be explained.
The light emitting element 128 shown in FIG. 10 irradiates the end surface 110a of the light guide 110 with light. Furthermore, the light guide 110 guides the light incident from the end surface 110a of the light guide 110 in the longitudinal direction of the light guide 110. As shown in FIG. 9, the light guide 110 directs light toward the upper part of the light condensing part 112 (in the direction of arrow B in the figure) by a reflecting member (not shown) formed along its longitudinal direction. is emitted.

Further, the light collecting section 112 guides (collects) light emitted from the light guide 110, irradiated onto the original G, and reflected from the original G (=reflected light) to the light receiving element 126. Further, the light receiving element 126 receives light reflected from the original G (=reflected light) and converts it into an electrical signal. In this way, the reading device 100 reads the image formed on the document G.

(Main part configuration)
Next, the configuration of the portion of the housing 114 to which the pair of lens arrays 152 and the light shielding member 150 are attached, the pair of lens arrays 152, and the light shielding member 150 will be described. Note that, as shown in FIG. 9, the light shielding member 150, the pair of lens arrays 152, and the light receiving substrate 102 are arranged in this order from the upper side to the lower side from the document G side. In the following description, the lens array 152 on the light shielding member 150 side may be referred to as one lens array 152, and the lens array 152 on the light receiving substrate 102 side may be referred to as the other lens array 152.

[Housing 114]
As shown in FIG. 11, the housing 114 is formed with an opening 130 that extends in the depth direction of the device and penetrates in the vertical direction of the device. A pair of upward surfaces 132 are formed at the upper end of the opening 130 in the housing 114 and extend in the depth direction of the device and face upward. The pair of upward facing surfaces 132 are arranged with the opening 130 interposed therebetween in the device width direction. The light shielding member 150 is placed on the pair of upward surfaces 132 from above and is fixed to the housing 114 by a fixing member 166.

Further, the housing 114 is formed with a pair of side surfaces 134 that extend in the device depth direction and sandwich the opening 130 from the device width direction, and the pair of side surfaces 134 include a pair of stepped surfaces 136 facing upward. A pair of step surfaces 137 extending in the device depth direction and facing upward, and a pair of step surfaces 138 extending in the device depth direction and facing upward are formed. Here, the pair of stepped surfaces 136 refer to a pair of bottom surfaces of a pair of recesses 140a (see FIG. 17) formed in plurality at intervals in the depth direction of the device on the pair of stepped surfaces 137. Furthermore, a pair of upward surfaces 132, a pair of stepped surfaces 137, a pair of stepped surfaces 136, and a pair of stepped surfaces 138 are arranged in this order from the upper side to the lower side. The pair of lens arrays 152 are placed on the pair of stepped surfaces 138 from above and fixed to the housing 114 by a fixing material (not shown) injected into the recesses 140a.

Further, the side surfaces 134 in the portion between the step surface 138 and the step surface 137 in the vertical direction of the device are a pair of sandwiching surfaces 140 that sandwich the pair of lens arrays 152 from the width direction of the device.

[Lens array 152]
The lens array 152 is integrally formed using polymethyl methacrylate (PMMA), which is a transparent resin material, and has a rectangular parallelepiped shape extending in the depth direction of the device. Lens array 152 is an example of an optical member.

As shown in FIGS. 12 and 13, the lens array 152 has a rectangular upper surface 152a that faces upward and extends in the depth direction of the device when viewed from above, and a rectangular upper surface 152a that faces downward and extends in the depth direction of the device when viewed from below. It has a shaped lower surface 152b. Furthermore, the lens array 152 is formed at both ends of the upper surface 152a in the device width direction, protruding upward from the upper surface 152a and extending in the device depth direction, and at both ends of the lower surface 152b in the device width direction, It has a protrusion 156 that protrudes downward from the lower surface 152b and extends in the depth direction of the device.

Further, a plurality of convex surfaces 158 are formed on the upper surface 152a and the lower surface 152b, respectively, and protrude from the planar portion of the upper surface 152a or the planar portion of the lower surface 152b. Note that the convex surface 158 is spherical, and the amount of protrusion from the planar portion of the upper surface 152a or the planar portion of the lower surface 152b of the protrusion 154, 156 is the same as the amount of protrusion from the planar portion of the upper surface 152a or the lower surface 152b of the projections 154, 156. The amount of protrusion from the planar part is small compared to the amount of protrusion. Note that the amount of protrusion of the plurality of convex surfaces 158 that protrudes from the planar portion of the upper surface 152a is the same as the amount of protrusion of the plurality of convex surfaces 158 that protrudes from the planar portion of the lower surface 152b. Furthermore, the amount of protrusion 154 protrudes from the planar portion of the upper surface 152a and the amount of protrusion 156 protrudes from the planar portion of the lower surface 152b are the same.

The spherical convex surfaces 158 are arranged in two staggered rows along the depth direction of the device (see FIG. 14). The number of convex surfaces 158 lined up in one row is the same as the number of convex surfaces 158 lined up in the other row. Note that "staggered" means "staggered." The convex surface 158 protruding from the upper surface 152a and the convex surface 158 protruding from the lower surface 152b are arranged at the same position when viewed from above. In other words, in one lens array 152 (one lens array 152 or the other lens array 152), the convex surface 158 protruding from the upper surface 152a and the convex surface 158 protruding from the lower surface 152b are opposed to each other in the vertical direction of the device. There is. Further, the distance between convex surfaces 158 adjacent to each other in the device depth direction, the distance between the convex surfaces 158 adjacent to each other in a direction inclined to one side with respect to the device depth direction, and the distance between convex surfaces 158 adjacent to each other in a direction inclined to the other side with respect to the device depth direction It is said that the intervals are the same.

As shown in FIG. 15, the lens array 152 is arranged such that the convex surface 158 formed on the lens array 152 faces a through hole 170, which will be described later, formed on the light shielding member 150 in the vertical direction of the device. There is.

Furthermore, the diameter of the convex surface 158 (d01 in FIG. 15, the diameter of the convex surface 158 seen from above) is larger than the diameter of the through hole 170 of the light shielding member 150 (d11 in FIG. 15). In the present embodiment, the portion of the convex surface 158 that faces the through hole 170 in the vertical direction of the device is the lens surface 144 . In other words, a portion of the lens array 152 in which the through hole 170 is projected downward is the lens surface 144 . The lens surface 144 formed on the upper surface 152a and the lens surface 144 formed on the lower surface 152b form a thick lens 164 corresponding to a rod lens in a rod lens array, as shown in FIG. In other words, the thick lens 164 is configured by a pair of convex surfaces 158 in one lens array 152 that face each other in the vertical direction of the device. Therefore, in this embodiment, the optical axis direction of the thick lens 164 is the vertical direction of the device.

That is, the light shielding member 150, one lens array 152, the other lens array 152, and the light receiving substrate 102 are arranged in this order in the optical axis direction of the thick lens 164 from the document G side. Note that the thick lens 164 is an example of a lens.

Furthermore, in the present embodiment, the other lens array 152 is obtained by inverting the top and bottom (up and down) of the one lens array 152 (=180 rotations). That is, one lens array 152 and the other lens array 152 are symmetrical in the vertical direction of the device.

Further, as shown in FIGS. 14 and 16, the thick lenses 164 of one lens array 152 and the thick lenses 164 of the other lens array 152 overlap each other when viewed from above. The tops of the protrusions 154 and 156 are butted against each other.

Then, with the tops of the protrusions 154 and 156 of each lens array 152 butted against each other, a fixing material 148 (for example, UV curable adhesive) is applied so as to straddle each lens array 152, and the fixing material 148 The respective lens arrays 152 are fixed to each other. Specifically, as shown in FIG. 16, fixing members 148 are provided at multiple locations at intervals in the depth direction of the device on the side surface 152c of the lens array 152. It protrudes from the side surface 152c to both sides in the device width direction. The fixing member 148 is an example of a convex portion.

Therefore, as shown in FIGS. 11 and 17, the fixing material 148 protruding from the side surface 152c is released from the sandwiching surface 140 of the housing 114 (to avoid the fixing material 148 from coming into contact with the sandwiching surface 140). ), a recess 140a is formed. The amount of depression of the recessed portion 140a from the sandwiching surface 140 is larger than the amount of protrusion of the fixing member 148 from the side surface 152c. Further, the recessed portion 140a is formed deeper than the region where the fixing member 148 that fixes the pair of lens arrays 152 is arranged in the vertical direction of the device.

Further, as shown in FIG. 15, a light shielding film 146 is formed on the upper surface 152a of one lens array 152 disposed on the light shielding member 150 side. Specifically, the light shielding film 146 is formed on a planar portion of the upper surface 152a and on the outer peripheral portion of the lens surface 144. In other words, the light shielding film 146 is formed on the planar portion of the upper surface 152a, the convex surface 158 of the upper surface 152a excluding the lens surface 144, and the peripheral portion of the lens surface 144. Here, the "light shielding film" is a film having a light transmittance (JIS K 7105) of 30% or less. Note that the light transmittance of the light shielding film 146 may be 30 [%] or less, preferably 15 [%] or less, and more preferably 5 [%] or less. In this way, the light shielding film functions as a transmission suppressing means for suppressing light transmission.

In this embodiment, as an example, the light shielding film 146 is a black coating (=coating film), and is formed on the upper surface 152a by an inkjet method.

Note that, as described above, the portion facing the through hole 170 in the vertical direction of the device is the lens surface 144 of the thick lens 164 in this embodiment. In other words, the diameter of the thick lens 164 (d02 in FIG. 15) is the same as the diameter d11 of the through hole 170.

The diameter of the exposed portion of the lens surface 144 where the light shielding film 146 is not formed (d03 in FIG. 15) is smaller than the diameter d02 of the lens surface 144. In other words, the diameter d03 of the exposed portion is smaller than the diameter d11 of the through hole 170. The upper surface 152a of one lens array 152 is an example of a surface.

In other words, the following formula (1) holds true for the diameter d01 of the convex surface 158, the diameter d02 of the thick lens 164, and the diameter d03 of the exposed portion of the lens surface 144 of the thick lens 164 that is not covered with the light shielding film 146. There is.
d01>d02>d03...(1)

In this embodiment, as an example, the diameter d01 is 0.5 [mm], the diameter d02 of the lens surface 144 is 0.45 [mm], and the diameter d03 of the exposed portion of the lens surface 144 is , 0.4 [mm]. Further, the interval (pitch) between adjacent thick lenses 164 is 0.55 [mm].

Further, as described above, the other lens array 152 uses one lens array 152 that is upside down (=180 rotations). Therefore, the light shielding film 146 is formed on the lower surface 152b of the other lens array 152 as well as on the upper surface 152a of one lens array 152. The lower surface 152b of the other lens array 152 is an example of the other surface. The pair of lens arrays 152 are fixed to the housing 114 using a fixing material (eg, UV curable adhesive).

[Light blocking member 150]
As shown in FIGS. 18 and 19, the light shielding member 150 extends in the depth direction of the device, and is formed with a plurality of cylindrical through holes 170 that penetrate in the vertical direction of the device. This light shielding member 150 is a member for blocking light that does not pass through the through hole 170 (= unnecessary light, for example, light in a direction tilted with respect to the vertical direction of the device) by passing the light through the through hole 170. . In other words, the light shielding member 150 allows light to pass through the through hole 170 to block unnecessary light in reading an image (= unnecessary light, for example, light in a direction tilted with respect to the optical axis direction of the thick lens 164). This is a member for blocking light. The device depth direction is an example of one direction.

As shown in FIG. 11, the light shielding member 150 is arranged such that the opening 130 formed in the housing 114 and the through hole 170 face each other in the vertical direction of the device. The through hole 170 is an example of a hole.

The plurality of through holes 170 overlap with the plurality of lens surfaces 144 (see FIG. 15) formed in the lens array 152 when viewed from above. For this reason, the through holes 170 are arranged in two rows in a staggered manner along the depth direction of the device, as shown in FIGS. 18 and 19. Furthermore, the distance between adjacent through holes 170 in the device depth direction and the distance between adjacent through holes 170 in a direction oblique to the device depth direction are the same as the distance between adjacent thick lenses 164.

In this embodiment, as an example, the length of the light shielding member 150 in the device depth direction (L1 in FIG. 18) is 336 [mm], and the diameter of the through hole 170 (d11 in FIG. 19) is as described above. , 0.45 [mm]. Further, the interval (pitch) between the through holes 170 is set to 0.55 [mm].

The light shielding member 150 is attached to the housing 114 using a fixing material 166 (for example, UV curable adhesive) with the twelve light shielding parts 160 extending in the device depth direction being arranged in the device depth direction. It is formed by fixing it. Specifically, as shown in FIG. 11, the fixing members 166 are provided at multiple locations at intervals in the depth direction of the device, spanning the upward surface 132 of the housing 114 and the light shielding member 150.

- Light shielding part 160 -
The light shielding part 160 is integrally molded from a black resin material (for example, acrylonitrile-butadiene-styrene copolymer resin (ABS resin)). In this embodiment, as an example, the length of the light shielding part 160 shown in FIG. 20(A) in the device depth direction (L2 in FIG. 20(A)) is 28 [mm], and the thickness in the vertical direction of the device is The length (T01 in FIG. 20(B)) is 5 [mm].

Further, as shown in FIGS. 20A and 20B, the light shielding parts 160 include a base part 162a extending in the depth direction of the device, and a base part 162a disposed on both sides of the base part 162a in the depth direction of the device. It has projecting portions 162b projecting on both sides in the width direction of the device. The device width direction is an example of a cross direction.

In this embodiment, as an example, the overhanging portion 162b overhangs by 0.3 [mm] on both sides of the device width direction with respect to the base portion 162a, and the width of the overhanging portion 162b (as shown in FIG. W2) is 2.6 [mm]. Further, when viewed from above, the outer shape of the light shielding part 160 is point symmetrical with respect to the center of gravity (G1 shown in FIG. 20(A)) of the light shielding part 160.

As shown in FIG. 17, when viewed from above, the protruding parts 162b of the adjacent light shielding parts 160 completely cover the recesses 140a formed in the sandwiching surface 140 of the housing 114. Thereby, the projecting portion 162b suppresses the light reflected from the document G from entering the lens array 152 through the recessed portion 140a. In other words, the projecting portion 162b functions as a suppressing means for suppressing light from passing through the recessed portion 140a.

Further, as shown in FIG. 20(A), a through hole 170 is formed in the light shielding part 160, and a U-shape extending in the vertical direction of the device is formed at both ends of the light shielding part 160 in the device depth direction. Two shaped grooves 172 are formed.

Furthermore, as shown in FIG. 21, a first protrusion 174 that projects in the device depth direction is formed at one end of the light shielding portion 160 in the device depth direction and at an upper portion in the device vertical direction. Furthermore, a second protrusion 176 that protrudes in the device depth direction is formed at the other end of the light shielding portion 160 in the device depth direction and on the lower side in the device vertical direction. Note that the first protrusion 174 and the second protrusion 176 are divided into three by the groove 172.

Further, as shown in FIGS. 22 and 23, when a plurality of light shielding parts 160 are arranged and fixed in the depth direction of the device, the grooves 172 of one of the adjacent light shielding parts 160 and the other light shielding part 160 face each other. , one through hole 170 is formed. Here, one of the light shielding parts specifically refers to the light shielding part 160 shown on the left side of the paper in FIGS. 21 to 23. Further, the other light shielding section specifically refers to the light shielding section 160 shown on the right side of the paper in FIGS. 21 to 23.

The first protrusion 174 and the second protrusion 176 extend above and below the device in the entire area in the width direction of the device except for the two through holes 170 formed by opposing grooves 172 that are adjacent in the depth direction of the device. overlap in direction. In other words, the first protrusion 174 and the second protrusion 176 overlap in the vertical direction of the device over the entire area where adjacent light shielding parts 160 are close to each other and face each other in the vertical direction of the device. Further, as shown in FIG. 21, an upwardly facing surface 176a is formed on the first protrusion 174 side of the second protrusion 176. Furthermore, a downward surface 174a facing downward is formed on the second protrusion 176 side of the first protrusion 174. Furthermore, a downward surface facing downward is formed on the second protrusion 176 side of the first protrusion 174 . Therefore, the entire area where adjacent light shielding parts 160 are close to each other and facing each other in the vertical direction of the device is a portion where the upward surface 176a and the downward surface are close to each other and face each other. Note that the term "proximity" refers to a distance of, for example, 100 μm or less, and is a concept that also includes a distance of 0 (=contact). Further, the upward surface 176a is an example of an intersecting surface.

Further, a gap is formed between the light shielding parts 160 that are adjacent to each other in the depth direction of the device in order to absorb variations in the light shielding parts 160 from one product to another. In other words, in the light shielding part 160, the lengths (protrusion amount) of the first protrusion 174 and the second protrusion 176 in the device depth direction are set so that the gap is formed. Here, "individual product variation" refers to manufacturing variation of parts, and refers to variation in processing dimensions of individual light shielding parts 160. The light shielding part 160 is long in the depth direction of the device and is integrally molded from a resin material. Therefore, the length of the light shielding part 160 in the device depth direction is easily affected by molding shrinkage and tends to vary.

Further, as shown in FIG. 24, the diameter of the through holes 170 of the light shielding part 160 is d11, the interval (pitch) of the through holes 170 is P, the thickness of the light shielding part 160 is T01, and the vertical direction of the device (= When the distance between the plane portion of the upper surface 152a of the lens array 152 and the light shielding portion 160 in the optical axis direction is L11, the following formula (2) holds true. In other words, when the distance between the lens array 152 and the light shielding member 150 in the vertical direction of the device is L11, the following formula (2) holds true.
0<L11≦T01 (P/d11-1) (2)

Note that L11 is an example of L, T01 is an example of T, and d11 is an example of D.

As a result, among the lights passing through the through hole 170, the light B01 that is most inclined with respect to the vertical direction of the device is suppressed from entering the thick lens 164 adjacent to the thick lens 164 facing the through hole 170. It has become.

(Manufacturing method of reading device)
Next, a method for manufacturing a reading device according to the present embodiment will be described while comparing it with a method for manufacturing a reading device according to a comparative embodiment. First, the light shielding member 350 and the casing 414 used in the method of manufacturing a reading device according to a comparative embodiment, and the method of manufacturing a reading device according to a comparative embodiment will be described. Note that for the light shielding member 350, the parts that are different from the light shielding member 150 will be mainly explained, and for the casing 414, the parts that are different from the casing 114 will be mainly explained.

[Light shielding member 350 used in the method of manufacturing a reading device according to the comparative embodiment]
The light shielding member 350 used in the method of manufacturing the reading device according to the comparative embodiment is formed by fixing 12 light shielding parts 360 extending in the depth direction of the device to the housing 414 using a fixing member 166. ing.

As shown in FIG. 31, the light shielding section 360 includes a base section 162a and an overhanging section 162b that is arranged on both sides of the base section 162a in the depth direction of the device and protrudes on both sides of the base section 162a in the width direction of the device. It has Furthermore, conical convex portions 362a and 362b protruding downward are formed on the lower surface 364 of the light shielding portion 360 facing downward.

The protrusion 362a is formed on the lower surface 364 on one side in the device width direction and on the front side in the device depth direction, and the protrusion 362b is formed on the lower surface 364 on one side in the device width direction. , and is formed at the back side of the device in the depth direction. Further, the convex portions 362a and 362b are disposed at a portion of the lower surface 364 that contacts the upward surface 132 (see FIG. 32) of the housing 414.

[Housing 414 used in the method for manufacturing a reading device according to the comparative embodiment]
As shown in FIG. 30, the upward surface 132 of the casing 414 used in the manufacturing method of the reading device according to the comparative embodiment includes a recess 432a into which the convex portion 362a of the light shielding portion 360 shown in FIG. A concave portion 432b into which the convex portion 362b of the light shielding portion 360 shown is fitted is formed. The concave portion 432a has a circular shape when viewed from above, and the position of the convex portion 362a in the device width direction and the device depth direction can be determined with the convex portion 362a fitted into the concave portion 432a. Further, the recess 432b has an elliptical shape extending in the depth direction of the apparatus when viewed from above, and the position of the protrusion 362b in the width direction of the apparatus can be determined with the protrusion 362b fitted into the recess 432b.

[Manufacturing method of reading device according to comparative form]
In a method for manufacturing a reading device according to a comparative embodiment, first, as shown in FIG. 32, a light receiving substrate 102 including a plurality of light receiving elements 126 and a plurality of thick lenses 164 ( A housing 414 having a pair of lens arrays 152 (see FIG. 11) fixed thereon is prepared.

Next, as shown in FIG. 29, the light shielding parts 360 are fixed to the housing 414 one by one from the back side to the front side in the depth direction of the device. In the following description, they are referred to as a light shielding part 360a, a light shielding part 360b, a light shielding part 360c, . . . from the back side to the front side in the depth direction of the device.

First, the light shielding part 360a located furthest in the depth direction of the apparatus is fixed to the housing 414. Specifically, the protrusion 362a (see FIG. 31) of the light shielding part 360a is fitted into the recess 432a in the upward surface 132 of the housing 414 that is furthest in the device depth direction, and the protrusion 362b (see FIG. 31) of the light shielding part 360a is fitted into the recess 432a of the upper surface 132 of the housing 414. It is fitted into the recess 432b of the upward surface 132 of the body 414 that is furthest in the device depth direction. With the light shielding part 360a positioned in the housing 414 in this manner, the light shielding part 360 is fixed to the housing 414 using the fixing material 166 (for example, a UV curable adhesive, see FIG. 11).

In this manner, the light shielding part 360b, the light shielding part 360c, . . . are fixed to the housing 414 in order. Further, the remaining members such as the pair of light guides 110 are attached to the casing 414, and a reading device according to the comparative embodiment is manufactured.

As described above, in the method for manufacturing a reading device according to the comparative embodiment, the light shielding part 360 is fitted into the housing 414 by fitting the convex parts 362a and 362b of the light shielding part 360 into the recesses 432a and 432b of the upward surface 132 of the housing 414. Positioned. For this reason, due to variations in accuracy of each light shielding part 360, variations in precision of each housing 414, variations in assembly, etc., the thick lens 164 of the lens array 152 fixed to the housing 414 and the through hole of the light shielding part 360 The positional accuracy relative to 170 is low. As a result, for example, the amount of light received by the light receiving element 126 varies.

[Method for manufacturing the reading device according to this embodiment]
In the method for manufacturing a reading device according to this embodiment, first, as shown in FIG. 25, a light receiving substrate 102 including a plurality of light receiving elements 126 and a plurality of thick lenses 164 through which light incident on the light receiving elements 126 passes. A casing 114 to which a pair of lens arrays 152 (see FIG. 11) are fixed is prepared.

Next, as shown in FIG. 28, the light shielding parts 160 are fixed to the housing 114 one by one from the back side to the front side in the depth direction of the device. In the following description, they are referred to as a light shielding part 160a, a light shielding part 160b, a light shielding part 160c, . . . from the back side to the front side in the depth direction of the device.

First, the light shielding part 160a shown in FIG. 28 is made to face the lens array 152 in the vertical direction of the apparatus, as shown in FIG. 26. Specifically, the light shielding part 160a is held by a robot hand (not shown) and placed on the upward facing surface 132, so as to face the lens array 152. In this state, the length in the device width direction where the lower surface of the light shielding portion 160a is in contact with one upward facing surface 132, and the length in the device width direction where the lower surface of the light shielding portion 160a is in contact with the other upward facing surface 132 are determined. The length in the direction is the same. Further, in this state, the grip of the light shielding part 160a by the robot hand is maintained (=continued).

Next, as shown in FIG. 27, the light B02 is irradiated onto the light shielding part 160a from above, and the amount of light that has passed through the through hole 170 and the pair of lens arrays 152 is measured by the light receiving element 126. 160 in one or the other direction in the depth direction of the device.

Specifically, the light B02 is emitted from the light irradiation device 500. This light B02 passes through the through hole 170, passes through the thick lens 164 (see FIG. 11) of the pair of lens arrays 152, and reaches the light receiving element 126. The light receiving element 126 photoelectrically converts the light B02 that has reached the light receiving element 126. The electrical signal photoelectrically converted by the light receiving element 126 is sent to a light amount measuring device (not shown) electrically connected to the light receiving element 126, and the light amount is measured by the light amount measuring device. In addition, in this light amount measuring device, which light receiving element 126 is selected depending on the position of the fixed light blocking portion 160a so that the amount of light that has passed through the through hole 170 of the light blocking portion 160 and the pair of lens arrays 152 is measured. It is input whether to receive electrical signals from. In other words, the light amount measuring device stores, for each light receiving element 126, an electrical signal representing the amount of light received by the light receiving element 126. Specifically, in the case of an image quality of 600 dpi, the light amount measuring device A/D converts 600 electrical signals (for 600 pixels) input from all 600 light receiving elements 126 and stores them as digital data. Then, as shown in FIG. 34, the light amount measuring device plots the 600 digital data on a graph in which the horizontal axis is the pixel (light receiving element 126) and the vertical axis is the amount of light (J in FIG. 34).

Then, while measuring the amount of light with the light receiving elements 126, the light shielding part 160 is moved to one side or the other in the depth direction of the device, and the average value of the amounts of light measured by all the light receiving elements 126 is made to be equal to or higher than a predetermined reference value. . In other words, the average value (L in FIG. 34) of the light amount (K in FIG. 34) measured by the light amount measuring device using the light receiving element 126 is set to be equal to or greater than the predetermined reference value (I in FIG. 34). The robot hand holding the light shielding part 160a moves the light shielding part 160a in one or the other direction in the depth direction of the apparatus while maintaining its position in the width direction of the apparatus (=without moving it in the width direction of the apparatus). Then, in a state where the average value of the light amount is equal to or greater than the reference value (=time point, L in FIG. 34), the robot hand stops the movement of the light shielding part 160 in the device depth direction.

Next, the light shielding part 160a is irradiated with light B02, and the light receiving element 126 measures the amount of light that has passed through the through hole 170 and the pair of lens arrays 152. Move to.

Specifically, the light B02 is continued to be emitted from the light irradiation device 500 without being stopped. This light B02 passes through the through hole 170, passes through the thick lens 164 (see FIG. 11) of the pair of lens arrays 152, and reaches the light receiving element 126. The light receiving element 126 photoelectrically converts the light B02 that has reached the light receiving element 126. The electrical signal photoelectrically converted by the light receiving element 126 is sent to the above-mentioned light amount measuring device electrically connected to the light receiving element 126, and the light amount is measured by the light amount measuring device (K in FIG. 34). Then, while measuring the amount of light with the light receiving element 126, the light shielding part 160a is moved to one side or the other in the width direction of the device, and the difference between the maximum value and the minimum value of the amount of light measured by the light receiving element 126 is determined based on a predetermined standard. Must be less than or equal to the value. In other words, the robot hand holding the light shielding part 160a determines the position in the depth direction of the device so that the difference between the maximum and minimum values of the light amount measured by the light amount measurement device is equal to or less than a predetermined reference value. While maintaining the state (=not moving in the device depth direction), move the light shielding part 160a to one side or the other in the device width direction.Then, the maximum value (MAX in FIG. 34) and minimum value (MIN in FIG. 34) of the light amount are ) is less than the reference value (=time point, M in FIG. 34), the robot hand stops the movement of the light shielding part 160 in the device width direction.

Note that even if the light shielding part 160 is moved to one side or the other in the width direction of the device while maintaining its position in the depth direction of the device after the average value of the amount of light is equal to or greater than the reference value, the measurement by the light receiving element 126 will not be performed. The state in which the average value of the amount of light is equal to or higher than the reference value is maintained. This is because the average value of the light amount largely depends on the position of the light shielding section 160 in the depth direction of the device.

Next, the light shielding part 160a is fixed to the housing 114 using a fixing material 166 (for example, a UV curable adhesive, see FIG. 11). When the light shielding part 160a is fixed to the housing 114 using the fixing material 166, the robot hand releases its grip on the light shielding part 160a, and then grips the light shielding part 160b fixed to the housing 114.

In this manner, by fixing the light shielding parts 160b, the light shielding parts 160c, . . . shown in FIG. be done.

Furthermore, the remaining members such as the pair of light guides 110 are attached to the housing 114 to manufacture the reading device according to the present embodiment.

(summary)
As described above, in the method for manufacturing a reading device according to the present embodiment, the light shielding part 160 is irradiated with light, and the light receiving element 126 measures the amount of light that has passed through the through hole 170 and the lens array 152 (= The light shielding part 160 is moved while measuring (using the light receiving element 126), and the light shielding part 160 is fixed to the housing 114. For this reason, compared to the case where the light shielding part 360 is positioned using a positioning shape with respect to the housing 414 to which the lens array 152 is fixed, as in the manufacturing method of the reading device according to the comparative embodiment, The relative positional accuracy between the thick lenses 164 of the fixed lens array 152 and the through holes 170 of the light shielding section 160 is increased.

Further, in the embodiment described above, the light shielding part 160 is moved only in the depth direction of the device, and the average value of the amount of light measured by all the light receiving elements 126 (=using all the light receiving elements 126) is set to be equal to or greater than the reference value. Here, the absolute value of the amount of light passing through the light shielding section 160 largely depends on the position of the light shielding section 160 in the depth direction of the device. Therefore, by moving the light shielding part 160 in a meandering manner in the depth direction of the apparatus (= moving the light shielding part 160 in the depth direction of the apparatus while reciprocating in the width direction of the apparatus), all light receiving elements are measured. Compared to the case where the average value of the light amount is set to be equal to or higher than the reference value, the average value of the light amount measured by all the light receiving elements becomes equal to or higher than the reference value in a short time.

Further, in the above embodiment, the light shielding part 160 is provided only in the width direction of the device when the average value of the light amount measured by the light receiving element 126 is equal to or greater than the reference value (=without moving the light receiving element 126 in the depth direction of the device). The difference between the maximum value and the minimum value of the amount of light measured by the light receiving element 126 is made equal to or less than the reference value. Here, the variation in the amount of light passing through the light shielding part 160 largely depends on the position of the light shielding part 160 in the device width direction. Therefore, compared to the case where the light blocking section is moved only in the depth direction of the device, the difference between the maximum value and the minimum value of the amount of light measured by the light receiving element becomes equal to or less than the reference value.

<Second embodiment>
A method for manufacturing a reading device according to a second embodiment of the present invention will be described. Note that regarding the second embodiment, parts that are different from the first embodiment will be mainly described.
In the method for manufacturing the reading device according to the first embodiment, as shown in FIG. 28, the light shielding portions 160 are fixed to the housing 114 one by one from the back side to the front side in the depth direction of the device. That is, the position of the light shielding part 160 that is first fixed to the casing 114 is the innermost side of the casing 160 in the device depth direction.

On the other hand, in the method for manufacturing a reading device according to the second embodiment, in the thick lenses 164 formed in the lens array 152 disposed on the document G side, the distance between adjacent thick lenses 164 (=center The light shielding part 160 is fixed to the housing 114 based on the distance between the two.

When fixing the light shielding part 160 to the housing 114, the light shielding part 160 at a position corresponding to the part where the interval between adjacent thick lenses 164 is the narrowest is first fixed to the housing 114. Then, the light shielding parts 160 are fixed to the casing 114 one by one in the direction away from the light shielding part 160 fixed first, starting from a position adjacent to the back side in the device depth direction of the light shielding part 160 fixed first. Next, the light shielding parts 160 are fixed to the casing 114 one by one starting from the position adjacent to the front side of the device in the depth direction of the light shielding part 160 fixed first, and moving away from the light shielding part 160 fixed first. .
That is, the second embodiment differs from the first embodiment in that the position of the light shielding part 160 that is first fixed to the housing 114 and the subsequent position of the light shielding part 160 that is fixed to the housing 114 first are different from the first embodiment. The only difference is the order in which they are fixed; everything else is the same.

Here, regarding the light shielding part 160 at a position corresponding to a part where the interval between adjacent thick lenses 164 is narrow (hereinafter sometimes referred to as a "narrow part"), the interval is wider than the narrow part (= the interval is All the light receiving elements 126 are moved by moving the light shielding part 160 compared to the light shielding part 160 at a position corresponding to a part (hereinafter sometimes referred to as a "wide part") (same as the interval between the matching through holes 170). It takes time for the amount of light measured in 2 to satisfy the standard value. Specifically, when fixing the light shielding part 160 at the position corresponding to the narrow part to the housing 114, the distance is larger (=longer distance) than when fixing the light shielding part 160 at the position corresponding to the wide part to the housing 114. ) It is likely that the light shielding part 160 must be moved in the depth direction of the apparatus. Therefore, when fixing the light shielding part 160 to the housing 114 regardless of the distance between adjacent thick lenses 164, when fixing the light shielding part 160 at the position corresponding to the narrow part to the housing 114, the light receiving element 126 When the light shielding section 160 is moved greatly in the depth direction of the device so that the amount of light measured in satisfies the reference value, the light shielding section 160 collides with another light shielding section 160 that has already been fixed to the housing 114 using the fixing material 116. It may be stored away. In this case, it becomes necessary to remove the other light shielding parts 160 fixed to the housing 114 using the fixing material 116 from the housing 114 together with the fixing material 116, and to attach the light shielding parts 160 to the housing 114 from the beginning. .

As a result, by first fixing the light shielding part 160 at a position corresponding to the narrowest interval between adjacent thick lenses 164 to the housing 114, regardless of the interval between adjacent thick lenses 164 (for example, Regardless of the spacing between the thick lenses 164, compared to the case where the light shielding parts are fixed to the casing 114 in order from the end in the depth direction of the device, the light shielding parts 160 are moved and measurements are taken on all the light receiving elements 126. The time required for the amount of light to satisfy the reference value is shortened. In other words, by first fixing the light shielding part 160 at the position corresponding to the part where the distance between adjacent thick lenses 164 is the narrowest to the housing 114, The total time required to fix all the light shielding parts 160 to the housing 114 is shorter than when the light shielding parts are fixed to the housing 114 in order from the end in the depth direction of the device.

Although the present invention has been described in detail with respect to a specific embodiment, the present invention is not limited to such embodiment, and can take various other embodiments within the scope of the present invention. This is clear to those skilled in the art. In the above embodiment, the light shielding member 150 is formed from the plurality of light shielding parts 160, but the light shielding member may be integrally formed of a resin material, for example.

Further, in the above embodiment, the light shielding part 160 is fixed to the housing 114, but as shown in FIG. It may be fixed at 152.

Further, in the embodiment described above, the average value of the amount of light measured by all the light receiving elements 126 is set to be equal to or greater than the reference value, but for example, the amount of light measured by all the light receiving elements 126 may be set to be equal to or greater than another reference value. However, in this case, the effect achieved by setting the average value of the light amounts measured by all the light receiving elements 126 to be equal to or greater than the reference value does not work.

Further, in the above embodiment, the difference between the maximum and minimum light amounts measured by the light receiving element 126 is set to be equal to or less than the reference value, but for example, the difference between the light amounts measured by adjacent light receiving elements in the depth direction of the device is It may be less than the standard value. However, in this case, the effect achieved by setting the difference between the maximum value and the minimum value of the amount of light measured by the light receiving element 126 to be equal to or less than the reference value does not work.

100 Reading device 102 Light receiving board (an example of a board)
126 Light receiving element 150 Light shielding member 152 Lens array (an example of an optical member)
160 Light shielding part 164 Thick lens (an example of a lens)
170 Through hole (an example of a hole)

Claims (5)

preparing a casing in which a substrate having a plurality of light-receiving elements and an optical member through which a plurality of lenses are formed, into which light received by the light-receiving elements is incident, and through which the light passes are fixed;
A light shielding member in which a plurality of holes are formed is opposed to the optical member,
moving the light blocking member while measuring the amount of light that has entered the lens through the hole and passed through the optical member with the light receiving element;
A method for manufacturing a reading device, in which the light shielding member is fixed to the housing or the optical member. The light shielding member includes a plurality of light shielding parts extending in one direction and arranged in the one direction,
A plurality of holes are formed in the light shielding part,
The method for manufacturing a reading device according to claim 1, wherein the light blocking portions are fixed to the housing or the optical member one by one by irradiating the light blocking portions with light. 3. The method for manufacturing a reading device according to claim 2, wherein the light shielding portion at a position corresponding to a portion of the optical member where the distance between adjacent lenses is the narrowest is first fixed to the casing or the optical member. When moving the light shielding part while irradiating the light shielding part with light and measuring the amount of light passing through the hole and the optical member with the light receiving element,
4. The method of manufacturing a reading device according to claim 2, wherein the light shielding section is moved in the one direction so that the average value of the amount of light measured by all the light receiving elements is equal to or higher than a reference value. With the average value of the amount of light measured by the light receiving element being equal to or higher than the reference value, move the light shielding part in a cross direction that intersects the one direction, and moving the light shielding part to the maximum and minimum values of the amount of light measured by the light receiving element. 5. The method for manufacturing a reading device according to claim 4, wherein the difference between the reading device and the reading device is set to be less than or equal to a reference value.