JP5020796B2 - Image reading apparatus and method for manufacturing image reading apparatus - Google Patents

Description

  The present invention relates to an image reading apparatus and a method for manufacturing the image reading apparatus.

  FIG. 6 shows a cross-sectional view of an example of a conventional image reading apparatus (see Patent Document 1). In the image reading apparatus X shown in FIG. 6, a light guide member 92, a lens unit 93, a substrate 94, a sensor chip 95, and an LED module 96 are accommodated in a case 91, and glass is provided in an opening 91 a provided on the upper portion of the case 91. The cover 97 is fitted. The outer edge of the glass cover 97 is bonded to the opening 91a with a low-viscosity resin 98. This image reading apparatus X has an outer shape extending with the direction perpendicular to the paper surface of FIG. 6 as the main scanning direction. The light guide member 92 includes a light guide 92a, a reflector 92b, and an emission surface 92c.

  Light from the LED module 96 travels in the light guide 92a along the main scanning direction, and is emitted from the emission surface 92c as linear light along the main scanning direction. The reflector 92b is made of a material having a relatively high reflectance such as white resin, for example, and is for preventing light from leaking from the light guide 92a. The linear light is reflected by the reading target and then converged on the sensor chip 95 by the lens unit 93. The sensor chip 95 is disposed on the substrate 94 along the main scanning direction. Thereby, the contents to be read can be read as image data.

  However, in the image reading apparatus X, the resin 98 that protrudes from the opening 91a may undesirably adhere to the light guide member 92 and the lens unit 93, and the light guide member 92 and the lens unit 93 do not operate normally. was there. For example, if an inappropriate pressure is applied to the light guide member 92 by the resin 98 and the position is shifted, the linear light emitted from the emission surface 92c may not be able to properly irradiate the reading target. Further, if an inappropriate pressure is applied to the lens unit 93 by the resin 98 and the position of the lens unit 93 is displaced, the reflected light from the reading target may not be properly converged on the sensor chip 95. As described above, the conventional image reading apparatus X cannot secure a precise arrangement of the optical components and sometimes cannot acquire suitable image data.

JP 2007-300536 A

  The present invention has been conceived under the circumstances described above, and is capable of ensuring a precise arrangement of optical components and capable of acquiring suitable image data, and such an image reading device. It is an object of the present invention to provide a method for manufacturing a device.

An image reading apparatus manufacturing method provided by the first aspect of the present invention includes a light source, a plurality of light receiving elements arranged along the main scanning direction, and a line along the main scanning direction of light from the light source. An optical component having at least one of a function of emitting the light toward the reading target as a shaped light and a function of guiding the reflected light of the linear light to the light receiving element, in the main scanning direction. A long rectangular case having an opening extending along the glass cover and a glass cover fitted into the opening, and the opening is bonded to the inner surface of the glass cover via a resin; A method of manufacturing an image reading apparatus having a side wall surface that stands up with respect to the receiving surface and faces a side edge of the glass cover, before the step of fitting the glass cover into the opening. Of the glass cover And a characterized by having at least a junction region, part of which adheres to the supporting surface, is divided into the other non-bonding region, the glass cover processing step of performing Bachimizuka processing to the non-bonding region To do.

  According to such a manufacturing method, since the non-bonding region is more likely to repel the resin than the bonding region, the resin is less likely to enter the non-bonding region from the bonding region. For this reason, the resin is unlikely to protrude from between the receiving surface and the joining region, and the resin is unlikely to unduly adhere to the optical component. Therefore, according to such a manufacturing method, an accurate arrangement of the optical components can be ensured, and an image reading apparatus capable of acquiring suitable image data can be manufactured.

  In a preferred embodiment of the present invention, in the glass cover treatment step, a surfactant that improves water repellency is applied to the non-bonded region. According to such a manufacturing method, the non-bonding region has improved water repellency, and the resin is more easily repelled than the bonding region. For this reason, the resin is unlikely to protrude from between the receiving surface and the joining region, and the resin is unlikely to unduly adhere to the optical component. Therefore, according to such a manufacturing method, an accurate arrangement of the optical components can be ensured, and an image reading apparatus capable of acquiring suitable image data can be manufactured.

  In preferable embodiment of this invention, it has the process of apply | coating the said resin to the said joining area | region, and fitting the said glass cover in the said opening part after the said glass cover process process. In this step, since the resin is pressed, it tends to spread. However, according to such a manufacturing method, the resin does not easily protrude from between the joining region and the receiving surface, and the resin does not easily adhere to the optical component. Therefore, according to such a manufacturing method, an accurate arrangement of the optical components can be ensured, and an image reading apparatus capable of acquiring suitable image data can be manufactured.

  In a preferred embodiment of the present invention, a resin injection hole communicating with the outside is formed in the side wall surface, and after the glass cover processing step, the step of fitting the glass cover into the opening, and the resin injection And injecting the resin from the hole. In this step, the resin injected into the resin injection hole penetrates between the receiving surface and the joining region by capillary action, and bonds the receiving surface and the joining region. According to such a manufacturing method, since the resin hardly penetrates into the non-joining region from between the receiving surface and the joining region, the resin is difficult to adhere to the optical component. Therefore, according to such a manufacturing method, an accurate arrangement of the optical components can be ensured, and an image reading apparatus capable of acquiring suitable image data can be manufactured.

  In a preferred embodiment of the present invention, the case includes a pair of inner walls that are adjacent to the receiving surface and face each other at a predetermined interval along the sub-scanning direction. A first side surface facing the inner surface of the glass cover, and a second side surface facing one of the inner walls, and arranged along one of the pair of inner walls, In the molding step, an inclined surface that is further away from the inner surface of the glass cover is formed between the first and second side surfaces as the second side surface is approached. According to such a manufacturing method, since the optical component is formed in a shape in which the portion approaching the receiving surface moves away from the glass cover, when the resin protrudes from the receiving surface, Becomes difficult to adhere to the optical component. Therefore, according to such a manufacturing method, an accurate arrangement of the optical components can be ensured more reliably, and an image reading apparatus capable of acquiring suitable image data can be manufactured.

The image reading apparatus provided by the second aspect of the present invention includes a light source, a plurality of light receiving elements arranged along the main scanning direction, and light from the light source as linear light along the main scanning direction. And an optical component having at least one of a function of emitting light toward a reading target and a function of guiding reflected light of the linear light to the light receiving element, and extending along the main scanning direction. A long rectangular case having an opening, and a glass cover fitted in the opening, the opening being bonded to the inner surface of the glass cover via a resin, and the receiving An image reading apparatus that has a side wall surface that stands up with respect to a stop surface and faces a side edge of the glass cover , wherein at least a part of the inner surface of the glass cover is bonded to the opening. It is a region, and the upper Region excluding the bonding region is not bonded regions, in the above non-bonding region, characterized in that the water repellent treatment is facilities.

  According to such a configuration, since the resin is repelled by the non-joining region, it is difficult to protrude from between the joining region and the receiving surface. Therefore, in such an image reading apparatus, the resin hardly adheres to the optical component, the precise arrangement of the optical component is ensured, and suitable image data can be acquired.

  In a preferred embodiment of the present invention, a resin injection hole communicating with the outside is formed in the side wall surface. According to such a configuration, the resin is injected from the resin injection hole and permeated between the receiving surface and the joining region by capillary action to bond the receiving surface and the joining region. Can be made. If it does in this way, the resin will not become excessive, and the resin will be more difficult to protrude from between the receiving surface and the joining region. Accordingly, in such an image reading apparatus, the resin is more difficult to adhere to the optical component, so that a precise arrangement of the optical component is ensured and suitable image data can be acquired.

  In a preferred embodiment of the present invention, the case includes a pair of inner walls that are adjacent to the receiving surface and face each other at a predetermined interval along the sub-scanning direction. A first side surface facing the inner surface of the glass cover, and a second side surface facing one of the inner walls, and is disposed along one of the pair of inner walls. An inclined surface is formed between the second side surface and the distance from the inner surface of the glass cover as it approaches the second side surface. According to such a configuration, since the optical component has a shape in which the portion approaching the receiving surface moves away from the glass cover, when the resin protrudes from the receiving surface, It is difficult to adhere. For this reason, such an image reading apparatus can easily secure a precise arrangement of the optical components and can acquire more suitable image data.

  Other features and advantages of the present invention will become more apparent from the detailed description given below with reference to the accompanying drawings.

  Hereinafter, preferred embodiments of the present invention will be specifically described with reference to the drawings.

  1 to 5 show an example of an image reading apparatus and a manufacturing method thereof according to the present invention. The image reading apparatus A of this embodiment includes a case 1, a light guide member 2, a lens unit 3, a substrate 4, a sensor chip 5, an LED module 6, and a glass cover 7.

  The case 1 includes a light guide member 2, a lens unit 3, a substrate 4, a sensor chip 5, and an LED module 6, and has a substantially rectangular parallelepiped shape extending along the main scanning direction. Has an opening 1a into which is inserted. As shown in FIG. 1, the opening 1a is formed in a rectangular shape having a long side extending along the main scanning direction and a short side extending along the sub-scanning direction. As shown in FIG. 3, the opening 1 a has a pair of receiving surfaces 11, a pair of side wall surfaces 12, and two grooves 13. The case 1 also has an opening at its lower part.

  The pair of receiving surfaces 11 are provided along both long sides of the opening 1a, are opposed to the inner surface of the glass cover 7, and are formed in a rectangular shape having the main scanning direction as a longitudinal direction. The pair of receiving surfaces 11 are bonded to both outer edges of the glass cover 7 along the main scanning direction via the resin 8. The pair of side wall surfaces 12 stand up with respect to the pair of receiving surfaces 11 and are formed to face both side edges of the glass cover 7. The pair of side wall surfaces 12 sandwich and hold the glass cover 7 in the sub-scanning direction. Resin injection holes 12 a communicating with the outside of the case 1 are formed in the pair of side wall surfaces 12. As shown in FIG. 2, eight resin injection holes 12 a are provided on one side of the pair of side wall surfaces 12. The eight resin injection holes 12a are also arranged on the other side of the pair of side wall surfaces 12. The two grooves 13 are respectively provided along both long sides of the opening 1a. The groove 13 is formed between the receiving surface 11 and the side wall surface 12 so as to be recessed inward with respect to the receiving surface 11.

  Further, as shown in FIG. 3, the case 1 has a pair of inner surfaces 14 a and 14 b that extend along the main scanning direction and face each other at a predetermined interval in the sub scanning direction. The inner surface 14a is orthogonal to one of the pair of receiving surfaces 11 at the edge near the opening 1a. The inner surface 14b is orthogonal to the other of the pair of receiving surfaces 11 at the edge near the opening 1a. The case 1 is made of, for example, a black resin.

  The light guide member 2 is an example of an optical component according to the present invention, and includes a light guide 21 and a reflector 22. The light guide 21 is made of a transparent resin such as methyl methacrylate resin (PMMA), for example, and emits light from the LED module 6 from the emission surface 21a as linear light extending in the main scanning direction. The light guide 21 extends along the main scanning direction, and has an incident surface facing the LED module 6 at one end thereof. The reflector 22 is for preventing undesirably leaking of the light traveling in the light guide 21 and is made of, for example, white resin. As shown in FIG. 3, the reflector 22 accommodates the light guide 21 so as to hold it. The reflector 22 is provided between the first side surface 22a facing the inner surface of the glass cover 7, the second side surface 22b facing the inner surface 14a, and the first side surface 22a and the second side surface 22b. And an inclined surface 22c. The inclined surface 22c is formed so as to be inclined by 45 ° with respect to the first side surface 22a so as to move away from the inner surface of the glass cover 7 as it approaches the second side surface 22b. The inclined surface 22c has a rectangular shape with its long side extending over substantially the entire length along the main scanning direction of the reflector 22, and the short side being, for example, 3 mm or more.

  The lens unit 3 is an example of an optical component according to the present invention. For example, a plurality of cylindrical lenses arranged in the main scanning direction are held by a resin housing. The lens unit 3 can converge the linear light reflected by the reading object P by the plurality of lenses onto the sensor chip 5. As shown in FIG. 3, the housing of the lens unit 3 includes a first side surface 3a facing the inner surface of the glass cover 7, a second side surface 3b facing the inner surface 14b, a first side surface 3a and a second side surface. And an inclined surface 3c provided between the side surface 3b. The inclined surface 3c is formed so as to be inclined by 45 ° with respect to the first side surface 3a so as to move away from the inner surface of the glass cover 7 as it approaches the second side surface 3b. The inclined surface 3c has a rectangular shape with its long side extending over substantially the entire length along the main scanning direction of the housing of the lens unit 3, and the short side being, for example, 3 mm or more.

  The substrate 4 is made of, for example, ceramic or glass epoxy resin, has a sensor chip 5 mounted thereon, and is electrically connected to the LED module 6. The substrate 4 is formed in a long rectangular shape extending along the main scanning direction, and is fitted into the lower opening of the case 1.

  The sensor chip 5 is an example of a light receiving element according to the present invention, and is disposed on the substrate 4 so as to extend in the main scanning direction. The sensor chip 5 is configured to generate an electromotive force according to the received light and to output a luminance signal for each pixel from the electromotive force. The image reading apparatus A can read the description content of the reading target P as image data by receiving the light reflected by the reading target P by the sensor chip 5.

  The LED module 6 is a light source according to the present invention, and includes, for example, an LED chip that emits red light, blue light, and green light. The LED module 6 is installed at one end of the case 1 along the main scanning direction so that the exit surface of the built-in LED chip faces one end of the light guide 21 in the main scanning direction.

  Note that a light guide having an incident surface parallel to the substrate 4 may be used, and the LED module may be mounted on the substrate 4 so that the emission surface of the LED chip faces the incident surface of the light guide. .

  The glass cover 7 has a substantially rectangular parallelepiped shape with the main scanning direction as the longitudinal direction. As shown in FIGS. 3 and 4, the glass cover 7 is bonded to the receiving surface 11 via the resin 8, and the other regions. And a non-joining region 7b. The joining region 7a is provided on both side edges of the glass cover 7 along the main scanning direction. A water repellent surfactant is applied to the non-bonding region 7b.

  As the resin 8 for bonding the receiving surface 11 and the bonding region 7a, a resin having a viscosity of, for example, 250 to 2000 mPa / s is used.

  Next, an example of a method for manufacturing the image reading apparatus A will be described.

  The image reading apparatus A is manufactured by separately manufacturing the case 1, the light guide 21, the reflector 22, the lens unit 3, the substrate 4, the LED module 6, and the glass cover 7 and assembling them. The sensor chip 5 is previously mounted on the substrate 4 when the substrate 4 is manufactured. The case 1, the light guide 21, and the reflector 22 are manufactured by resin molding using a mold. The lens unit 3 is manufactured by resin-molding a housing and attaching a plurality of lenses to the housing.

  In this embodiment, the inclined surface 22c is formed by resin-molding the reflector 22 using a mold having an inclined surface corresponding to the inclined surface 22c. Similarly, the inclined surface 3c is formed by resin-molding the housing of the lens unit 3 using a mold having an inclined surface corresponding to the inclined surface 3c.

  When assembling the image reading apparatus A, first, the light guide 21 and the reflector 22 are combined, and then inserted into the case 1 from the opening 1a and fixed. Further, the lens unit 3 is also inserted into the case 1 from the opening 1a and fixed. Further, the LED module 6 and the substrate 4 are combined and inserted and fixed from the opening below the case 1. In this way, the light guide 21, the reflector 22, the lens unit 3, the substrate 4, and the LED module 6 can be accommodated in the case 1.

  Next, as shown in FIG. 4, the inner surface of the glass cover 7 is partitioned into a bonding region 7a and a non-bonding region 7b, and a glass cover treatment process is performed in which a water-repellent surfactant is sprayed on the non-bonding region 7b. Thereafter, the glass cover 7 is fitted into the opening 1a so that the joining region 7a faces the receiving surface 11 as shown in FIG.

  Next, as shown in FIG. 5, the resin 8 is injected from each resin injection hole 12a. The resin 8 first enters the groove 13, and the resin 8 overflowing from the groove 13 permeates between the receiving surface 11 and the joining region 7a by a capillary phenomenon. The resin 8 that has penetrated adheres between the receiving surface 11 and the joining region 7a, and the glass cover 7 is fixed to the opening 1a, whereby the assembly of the image reading apparatus A is completed.

  Next, the operation of the image reading apparatus A and its manufacturing method will be described.

  According to the manufacturing method of the image reading apparatus A as described above, the amount of the resin 8 sandwiched between the receiving surface 11 and the joining region 7a is unlikely to be excessive. Further, since the water-repellent surfactant is applied to the non-bonding region 7b, the resin 8 is difficult to penetrate into the non-bonding region 7b from between the receiving surface 11 and the bonding region 7a. For these reasons, in the image reading apparatus A, it is difficult for the resin 8 to leak from between the receiving surface 11 and the joining region 7a. Therefore, the image reading apparatus A is less likely to adhere the resin 8 to the light guide member 2 and the lens unit 3, and the precise arrangement of the light guide member 2 and the lens unit 3 is ensured, so that suitable image data can be acquired. It has become.

  Furthermore, according to the present embodiment, since the inclined surface 22 c is formed on the reflector 22, the resin 8 is less likely to adhere to the reflector 22. Similarly, since the inclined surface 3 c is formed on the housing of the lens unit 3, the resin 8 is less likely to adhere to the lens unit 3. For this reason, in the image reading apparatus A, it is possible to ensure the precise arrangement of the light guide member 2 and the lens unit 3 more reliably.

  The image reading apparatus and the method for manufacturing the image reading apparatus according to the present invention are not limited to the above-described embodiments. The specific configuration and method of each part in the image reading apparatus and the image reading apparatus manufacturing method according to the present invention can be varied in design in various ways.

  For example, in the above embodiment, the resin 8 is injected from each resin injection hole 12a, and the resin 8 is infiltrated between the receiving surface 11 and the bonding region 7a by capillary action. You may press-fit the glass cover 7 to the opening part 1a, after apply | coating the resin 8 to the area | region 7a. Even in such a method, it is possible to prevent the resin 8 from adhering to the light guide member 2 and the lens unit 3 if the non-bonding region 7 b repels the resin 8.

  Further, in the above-described embodiment, a method of spraying a water-repellent surfactant on the non-bonding region 7b is adopted, but the surfactant may be fixed on the non-bonding region 7b by printing. Furthermore, the non-bonding region 7b may be subjected to water repellent processing using, for example, plasma without using a surfactant.

  In forming the inclined surface 22c and the inclined surface 3c, the inclined surface 22c and the inclined surface 3c may be formed by performing resin molding using a mold having no inclined surface and then cutting the resin.

1 is a plan view illustrating an example of an image reading apparatus according to the present invention. 1 is a front view illustrating an example of an image reading apparatus according to the present invention. It is sectional drawing which follows the III-III line of FIG. It is a top view which shows the inner surface of the glass cover which concerns on this invention. It is sectional drawing which shows an example of the manufacturing method of the image reader which concerns on this invention. It is sectional drawing which shows an example of the conventional image reading apparatus.

Explanation of symbols

A Image reading device P Reading object 1 Case 1a Opening 2 Light guide member 3 Lens unit 3a First side surface 3b Second side surface 3c Inclined surface 4 Substrate 5 Sensor chip (light receiving element)
6 LED module (light source)
7 Glass cover 8 Resin 11 Receiving surface 12 Side wall surface 12a Resin injection hole 13 Grooves 14a and 14b Inner surface 21 Light guide 21a Outgoing surface 22 Reflector 22a First side surface 22b Second side surface 22c Inclined surface

Claims (8)

A light source, a plurality of light receiving elements arranged along the main scanning direction, a function of emitting light from the light source toward the reading target as linear light along the main scanning direction, and the linear light An optical component having at least one of a function of guiding reflected light to the light receiving element, and a long rectangular case having an opening extending along the main scanning direction;
A glass cover fitted into the opening;
With
An image reading apparatus in which the opening has a receiving surface that adheres to the inner surface of the glass cover via a resin, and a side wall surface that stands up with respect to the receiving surface and faces a side edge of the glass cover. A manufacturing method of
Before the step of fitting the glass cover into the opening,
A glass cover treatment step of partitioning the inner surface of the glass cover into a joining region where at least part of the glass cover adheres to the receiving surface and a non-joining region other than that, and performing a water repellent treatment on the non-joining region A method for manufacturing an image reading apparatus.   The method for manufacturing an image reading apparatus according to claim 1, wherein in the glass cover processing step, a surfactant that improves water repellency is applied to the non-bonded region.   The method for manufacturing an image reading apparatus according to claim 1, further comprising a step of applying the resin to the joining region and fitting the glass cover into the opening after the glass cover treatment step.   A resin injection hole communicating with the outside is formed in the side wall surface, and after the glass cover treatment step, a step of fitting the glass cover into the opening, and a step of injecting the resin from the resin injection hole The method for manufacturing an image reading apparatus according to claim 1, comprising: Each of the cases has a pair of inner walls that are adjacent to the receiving surface and face each other at a predetermined interval along the sub-scanning direction.
The optical component includes a first side surface facing the inner surface of the glass cover, and a second side surface facing one of the inner walls, and is disposed along one of the pair of inner walls,
5. The method according to claim 1, wherein in the step of molding the optical component, an inclined surface that is further away from the inner surface of the glass cover is formed between the first and second side surfaces as it approaches the second side surface. A method for manufacturing the image reading apparatus according to claim 1. A light source, a plurality of light receiving elements arranged along the main scanning direction, a function of emitting light from the light source toward the reading target as linear light along the main scanning direction, and the linear light An optical component having at least one of a function of guiding reflected light to the light receiving element, and a long rectangular case having an opening extending along the main scanning direction;
A glass cover fitted into the opening;
With
An image reading apparatus in which the opening has a receiving surface that adheres to the inner surface of the glass cover via a resin, and a side wall surface that stands up with respect to the receiving surface and faces a side edge of the glass cover. Because
Inner surface of the glass cover is at least junction region part is bonded with the opening, and the region excluding the bonding region is not bonded areas, is facilities water-repellent treatment in the non-bonding region An image reading apparatus.   The image reading apparatus according to claim 6, wherein a resin injection hole communicating with the outside is formed in the side wall surface. Each of the cases has a pair of inner walls that are adjacent to the receiving surface and face each other at a predetermined interval along the sub-scanning direction.
The optical component includes a first side surface facing the inner surface of the glass cover, and a second side surface facing one of the inner walls, and is disposed along one of the pair of inner walls,
The image reading apparatus according to claim 6, wherein an inclined surface is formed between the first side surface and the second side surface so as to be farther from the inner surface of the glass cover as the second side surface is approached.

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