JP5018748B2 - Contact image sensor - Google Patents

Description

The present invention relates to a contact image sensor equipped with a condenser lens and a light guide.

  In order to read image information at high speed, it is desired to irradiate a reading surface with a larger amount of light, and for this purpose, a function having a light condensing function may be used. For example, FIG. 2 (see Patent Document 1) of Japanese Patent Laid-Open No. 5-181004 discloses an image sensor in which an assembly body composed of an LED printed board 4 and a condenser lens 21 is attached to an attachment surface 6 of a base 7. Has been.

  Also, in the case where uniform light irradiation in the longitudinal direction is performed as the light source of the contact image sensor, a light source is arranged at the end in the longitudinal direction and light is emitted from the same light source in the longitudinal direction rather than a configuration having a plurality of light sources in the longitudinal direction. If the light is propagated and diffused, it is easier to obtain a uniform amount of irradiation light, and the structure is inexpensive. For example, in FIG. 1 (see Patent Document 2) of Japanese Patent Laid-Open No. 2000-125080, the light source 3 is mounted at the end of the light guide 8 for guiding the light emitted from the light source 3 to the line-shaped image reading region. An image reading apparatus is disclosed.

Japanese Patent Laid-Open No. 5-181004 (FIG. 2)

Japanese Unexamined Patent Publication No. 2000-125080 (FIG. 1)

  However, in the image sensor described in Patent Document 1, the light emitted from the LED 3 is collected by reflection or refraction in the condenser lens 21 and is irradiated to the read portion of the document 14 as parallel rays. Therefore, although the portion to be read of the document 14 is brightly illuminated at necessary portions, since many point light sources are arranged in the longitudinal direction, it is difficult to perform uniform illumination in the longitudinal direction. There was a problem of becoming an expensive image sensor.

Further, in the image reading device described in Patent Document 2, although the amount of light irradiated to each part in the longitudinal direction of the image reading region can be made uniform, the shape of the light guide 8 is large and complicated, so that the light source 3 The structure of the case 1 that accommodates the substrate 4 and the light guide 8 placed thereon is complicated, and there is a problem that the illuminance for illuminating the document surface varies due to tolerances at the time of incorporation.

  The present invention has been made to solve the above-described problems, and provides a contact image sensor that ensures uniform irradiation performance in the longitudinal direction, efficiently irradiates the document surface, and has good incorporation performance. For the purpose.

The contact image sensor according to the first aspect of the present invention has a mounting portion at an end, a housing for housing components including an imaging optical system, a light guide extending in the reading width direction of the document, It is provided along the light guide , and includes a light collecting portion that collects light emitted from the light guide and then irradiates the irradiation portion of the document , and a flange extending from the light collecting portion. A condensing lens and an end portion of the condensing lens and the light guide, a hole is provided in a flat plate, and the end of the light guide is inserted into one end side of the hole, and the light guide A holder that holds the end of the condenser lens outside the hole and a light source that is disposed in the other end side space of the hole of the holder and makes light incident on the light guide, The condensing lens extends in the reading width direction of the original and is disposed on the side opposite to the flange portion with respect to the condensing portion. A lens array which emitted light converges the light reflected by the irradiated portion of the document, the lead terminal for supplying power to the light source while placing the light source from the substrate to cover the holder wall this is said holder through the substrate is placed along the wall surface of the substrate on the opposite side, and a bracket of the holder and the substrate is fixed by the mounting portion of the housing with the mounting means, the housing The body accommodates the lens array and the light guide, and the flange portion is placed on a step portion formed on the opposite side of the lens array with respect to the portion accommodating the light guide. .

According to a second aspect of the present invention, there is provided the contact image sensor according to the first aspect, wherein the substrate is composed of a flexible substrate and a metal plate that form the lead terminals.

  According to a third aspect of the present invention, there is provided the contact image sensor according to the first or second aspect, wherein an elastic member is interposed between the substrate and the bracket.

According to a fourth aspect of the present invention, there is provided the contact image sensor according to the third aspect, wherein the elastic member is a leaf spring.

  The contact image sensor according to a fifth aspect of the present invention is the fitting according to any one of the first to fourth aspects, wherein the condensing lens and the holder are fitted by a notch formed with a notched projection. Is.

In the contact image sensor according to the sixth aspect of the present invention, the light guide and the holder are fitted with a protrusion at an end of the light guide and a recess provided in a hole of the holder. It is a thing of any one of Claim 1 thru | or 5.

7. The contact image sensor according to claim 7, wherein the lens array is in contact with the condensing lens on the side opposite to the flange portion with respect to the condensing portion. As described.

Contact image sensor according to the invention of claim 8, wherein the light source, the light guide body and the converging lens is disposed on both sides perpendicular to the reading width direction with respect to the irradiation unit, arranged on the opposite sides those described in claim 7, wherein the lens array is sandwiched by the condenser lens.

9. The contact image sensor according to claim 9, wherein the flange portion has a support portion that protrudes toward the light guide body and contacts the light guide body. Item 1 .

According to a tenth aspect of the present invention, there is provided the contact image sensor according to the ninth aspect, wherein a plurality of the support portions are arranged along a reading width direction of the document .

  According to the invention described in claim 1, since the light source, the light guide and the condenser lens are held or fixed in a fixed arrangement with respect to the holder, the light guide ensures a uniform irradiation performance in the longitudinal direction, The condensing lens can efficiently irradiate the document surface. Further, there is an effect of obtaining a close contact type image sensor with high assembling efficiency by making a light guide, a condensing lens, and a holder in advance as a kit and then assembling them together in a housing.

  According to the invention described in claim 2, since the substrate is composed of the flexible substrate and the metal plate, the heat generated by the light source is easily dissipated from the metal plate to the outside, so that a large number of light sources are mounted. This has the effect of enabling the original to be illuminated with high brightness.

  According to the invention described in claim 3, since the elastic member is interposed between the substrate and the bracket, there is an effect that stable attachment can be performed by the elastic force of the elastic member, and the light guide and the condenser lens in the reading width direction are provided. There is an advantage that it is possible to prevent bending due to heat generation.

  According to the invention described in claim 4, since a metallic leaf spring is used for the elastic member, in addition to the effect described in claim 2, there is an effect that heat dissipation is further enhanced.

  According to the fifth aspect of the present invention, since the condensing lens and the holder are configured to be fitted with the notched protrusion and the recess, a dedicated fitting member is unnecessary, and the number of parts is reduced. There is an effect to make.

  According to the invention described in claim 6, since the light guide and the holder are fitted by the protrusion at the end of the light guide and the recess provided in the hole of the holder, the light guide is circular. Even if it exists, there exists an effect that the attachment position and attachment angle of a light guide are decided automatically.

According to the seventh aspect of the present invention, there is an effect that the arrangement accuracy of the condenser lens in contact with the lens array is improved by the lens array .

According to the eighth aspect of the present invention, since the document surface is illuminated from both sides of the irradiation unit, even if the conveyed document has undulations, the irradiation unit is irradiated with light from different directions, so that stable illumination is maintained. The lens array is arranged at the center of the condensing lens, and the arrangement accuracy inside the condensing lens in contact with the lens array is improved by the lens array .

According to the ninth aspect of the present invention, the gap in the reading width direction between the condensing lens and the light guide is made constant by the support portion, and the illumination in the reading width direction with respect to the irradiation portion is made uniform.

According to the tenth aspect of the present invention, since a plurality of support portions are arranged along the reading width direction of the document , the support portions can be constituted by small piece structures, and there is an advantage that labor saving of members can be achieved.

Embodiment 1 FIG.
Embodiment 1 of the present invention will be described below with reference to FIG. FIG. 1 is an exploded perspective view of the overall configuration of a contact image sensor (image sensor) according to the first embodiment. In FIG. 1, 1 is a document (object to be irradiated) conveyed in the conveyance direction (sub-scanning direction) of the contact image sensor, 2 is a housing for housing components mounted on the contact image sensor, and 3 is a main scanning direction A transparent light guide 4 that extends in the (reading width direction) and transmits light, and 4 concentrates the light emitted from the light guide 3 at the reading position (irradiation unit) in the main scanning direction of the document 1 located above. The transparent condensing lens 5 for illumination is provided at the end of the light guide 3 or the condensing lens 4, has a hollow region, and enters the light guide 3 from the end incident surface of the light guide 3. It is a holder in which a light propagation path is formed. The holders 5 are installed at both ends in the reading width direction.

  Reference numeral 6 denotes a transparent transmissive member that is interposed between the condenser lens 4 and the document 1 and forms a conveyance path and prevents foreign matters from entering, and 7 is a rod lens array (lens) that focuses light reflected from the document surface. Body). A sensor IC 8 photoelectrically converts light converged by the rod lens array 7 by linearly arranging a large number of light receiving portions, and a sensor substrate 9 on which the sensor IC 8 and the like are mounted. The sensor substrate 9 outputs the photoelectric conversion signal photoelectrically converted by the sensor IC 8 as an image signal from a connector (not shown) or the like to the outside. The sensor substrate 9 on which the rod lens array 7 and the sensor IC 8 are mounted is called an imaging optical system. In the drawings, the same reference numerals indicate the same or corresponding parts.

  Reference numeral 10 denotes a light source constituted by an LED or a bare chip in which an LED chip is resin-molded, and 11 is a bendable substrate (flexible substrate) on which the light source is placed, and has lead terminals extended from the wall surface of the holder 5. Reference numeral 12 denotes an elastic member such as a leaf spring made of sheet metal, 13 denotes a bracket that covers both ends of the contact image sensor in the reading width direction, 14 denotes a mounting screw (attachment means) for fixing a component, and 15 denotes a contact image sensor. The housing 2 is threaded.

FIG. 2 is a cross-sectional view of the contact image sensor according to the first embodiment. In FIG. 2, the light guide 3 has a core shape or a substantially circular cross section, and a light scattering layer (light scattering region) that scatters or reflects light along the reading width direction is formed. A light-scattering layer is comprised by the white silk printing pattern or vapor deposition pattern on the light-guide 3 surface. As another method, a method of providing a kerf in the light guide 3 or a configuration in which the surface roughness of the light guide 3 is increased may be employed. The pattern of the light scattering layer is arranged by appropriately adjusting the pattern shape and pattern pitch to obtain uniform light emission over the reading width direction. In the figure, the same reference numerals as those in FIG. 1 denote the same or corresponding parts.

Light that passes through the internal light guide path of the light guide 3 from the exit portion (light exit portion) of the portion facing the light scattering layer with respect to the central axis of the light propagation direction of the light guide 3 radiates toward the condenser lens 4 side. Is done. The condensing lens 4 is separated from the light guide 3 and illuminates the irradiating portion with the irradiation light from the light guide 3 through the transmission body 6.

  FIG. 3 is a developed configuration diagram illustrating the fitting of the light guide body and the condensing lens of the contact image sensor according to Embodiment 1 of the present invention. In FIG. 3, 3a is a protrusion provided at the end of the light guide 3, 4a is a protrusion provided at the end of the condenser lens 4 side, and 4b is a recess provided at the end of the condenser lens 4 side. , 5a is a hole in the holder 5, 5b is a recess provided in the hole of the holder 5, 5c is a protrusion provided in the holder 5, 5d is a recess provided in the holder 5, and 5e is a holder 5 These are dowels (protrusions) for alignment provided on the outer sides of both ends. Note that the protrusion 5 c and the recess 5 d provided on the holder 5 are also referred to as notch portions of the holder 5. In the figure, the same reference numerals as those in FIG. 1 denote the same or corresponding parts.

FIG. 4 is a partially enlarged configuration diagram for explaining the fitting between the light guide and the holder of the contact image sensor according to Embodiment 1 of the present invention. In FIG. 4, the light guide 3 inserts the end protrusion 3 a of the light guide 3 into the hole 5 a of the holder 5, and the protrusion 3 a of the light guide 3 is a recess provided in the hole 5 a of the holder 5. 5b is fitted (fitted). The recessed portion 5b does not necessarily have to penetrate in the main scanning direction side, and by positioning the projection 3a of the light guide 3, the positioning or mounting accuracy of the light guide 3 based on the abutting position can be improved. . 3, the same reference numerals as those in FIG. 3 denote the same or corresponding parts.

As described above, even in the case of the light guide 3 having the shape of the core cylindrical light guide path, the irradiation angle of the emission part of the light guide 3 is fixed by the projection 3a and the holder 5, and the rotation deviation of the light guide 3 is fixed. This prevents an irradiation deviation on the side of the sub-scanning direction with respect to the irradiation part.

FIG. 5 is a partially enlarged configuration diagram for explaining the fitting of the condenser lens and the holder of the contact image sensor according to Embodiment 1 of the present invention. In FIG. 5, the condensing lens 4 inserts the end protrusion 4 a and the depression 4 b of the condensing lens 4 into the protrusion 5 c and the depression 5 d of the holder 5, and the protrusion 4 a and the depression of the condensing lens 4. 4b is fitted (fitted) with the recess 5d and the protrusion 5c of the holder 5. The protrusions 5c and the recesses 5d do not necessarily have to penetrate in the main scanning direction, and the condensing lens 4 can be positioned with reference to the abutting position by abutting the protrusions 4a and the recesses 4b of the condenser lens 4. Mounting accuracy can be improved. In the figure, the same reference numerals as those in FIG. 3 denote the same or corresponding parts.

  From the above, the light source 10, the light guide 3, and the condenser lens 4 are held in a fixed arrangement with the holder 5 as a reference by connecting the holder 5 to a component that is fixed or fitted with the reference. It is possible to perform uniform irradiation with no variation. Moreover, the light guide 3, the condensing lens 4, and the holder 5 are made into a kit in advance and are incorporated into the housing 2, so that the assemblability including the positional accuracy is improved.

FIG. 6 is a partially enlarged configuration diagram for explaining the attachment of the contact image sensor according to the first embodiment of the present invention. In FIG. 6, 2a is an end opening (opening) of the housing 2, 5f is a bottom surface of the holder 5, and 11a is a sheet metal (metal plate) that protects the light source 10 portion of the flexible substrate 11 from bending and bending. 11b indicate lead terminals for supplying power to the light source 10 from the outside. 12 a is a pressing portion of the elastic member 12, 12 b is a bent sheet metal portion covering the notch portion of the holder 5 of the elastic member 12, and 12 c is an elastic portion of the elastic member 12. In the first embodiment, the elastic portion 12c uses a leaf spring, but a flat rubber material or a resilient silicon adhesive may be used. In the figure, the same reference numerals as those in FIG. 1 denote the same or corresponding parts.

A light source 10 such as an LED is mounted on a flexible substrate 11, and the lead terminal 11b plays a role of electrical connection with the outside. The flexible substrate 11 is connected to an elastic member 12 having an elastic portion 12c such as a stretchable leaf spring, and finally the bracket 13 is overlapped and screwed to the housing 2 with a screw 14 (attachment means). The screwing may be performed by temporarily fixing the elastic member 12 and the housing 2 and then screwing the bracket 13 and the housing 2 with the elastic member 12 sandwiched therebetween. As shown in FIG. 7, the flexible substrate 11 and the elastic member 12 are temporarily fixed and fixed by a dowel 5 e provided in the holder 5 in the order of the flexible substrate 11, the sheet metal 11 a, and the elastic member 12 in order of the holder 5. To do.

That is, in the tightening process for storing the condenser lens 4 and the light guide 3 assembled with the holder 5 as a reference in the housing 2, the condenser lens 4, the light guide 3 and the holder 5 are stored in the housing 2. After that, the flexible substrate 11 on which the light source 10 is mounted and the elastic member 12 are inserted from both sides with reference to two dowels (holder pins) 5e protruding from the holder-5. Thereafter, the bracket 13 is attached to the attachment portion 15 using screws 14.

From the above, the arrangement of the light source 10 and the light guide 3 is also based on the holder 5 so that the mounting accuracy of these illumination optical systems can be kept high.

In addition, the transparent body 6 and the housing 2 may be fixed by pressing the transparent body 6 extended to the notch portion of the holder-5 by the sheet metal bending portion 12b without fixing with the adhesive. .

With the above configuration, the condenser lens 4, the light guide 3, the holder 5, and the transmissive body 6 are fixed to each other with high positional accuracy without using an adhesive such as resin with the housing 2. This produces the effect of easy handling during assembly and repair.

The assembled condenser lens 4, light guide 3 and holder 5 are installed inside the housing 2 with reference to the bottom surface portion 5 f of the holder 5 and the opening 2 a of the housing 2. The holder 5 is formed of a mold-molded product, and the surface accuracy of the opening 2a of the housing 2 is increased by precision machining, so that the accuracy of the holder 5 and the housing 2 is improved. The rod lens array 7 is arranged at the center of the lens 4, and the arrangement accuracy inside the condenser lens 4 in contact with the rod lens array 7 is also improved by the rod lens array 7.

Next, the operation will be described with reference to FIGS. Both ends of the pair of condensing lenses 4 and the pair of light guides 3 are held by the holder 5 and installed inside the housing 2 in which the rod lens array 7 is arranged in the center. A light source 10 is arranged at each end of the light guide 3.

The light emitted from the light source 10 mounted on the flexible substrate 11 passes through the hole 5a inside the holder 5 and enters from the end of the light guide 3, and main scanning while repeating total reflection inside the light guide 3. The condensing lens 4 is irradiated with illumination light that is propagated in the direction and gradually scattered and reflected by the scattering region provided in the light guide 3. The condenser lens 4 has a focal point substantially on the surface of the original, and the light is concentrated on the irradiation portion (reading position) of the original 1 being conveyed.

  The light reflected by the image information on the original surface is converged by the rod lens array 7, and the light converged by the rod lens array 7 is photoelectrically converted by the light receiving unit of the sensor IC 8 mounted on the sensor substrate 9. The photoelectrically converted output outputs information on a reading object such as the original 1 to the outside as an electrical signal.

By the way, the photoelectric conversion output preferably has a wide dynamic range, and the drive current of the light source 10 increases when the photoelectric conversion output is driven at high speed. For example, when the light source 10 is pulse-driven, when the loss voltage of the light source is 1.5 V in addition to the amount of heat generated by the light, a driving current of about 50 mA is necessary, so that a loss power of about 75 mW is generated. Furthermore, since the light source 10 is mounted with LED light sources of a plurality of emission colors such as RGB at the same time and is driven at the same time in addition to being lit in a single color, even greater Joule heat is generated.

  In order to effectively dissipate the Joule heat, it is necessary to install the light source 10 near the metal surface and dissipate the heat conducted to the metal surface to the outside of the contact image sensor. Therefore, by using the metal plate 11a such as a sheet metal as the base of the flexible substrate 11, the heat dissipation effect is enhanced.

  The flexible substrate 11 on which the light guide 3, the condenser lens 4, and the light source 10 are mounted and the holder 5 are fixed to the housing 2 via the elastic member 12 having elasticity, so that the flexible substrate on which the light source 10 is mounted. 11 and the light guide 3 can be distorted by stretching or contracting, and stable irradiation can be performed in the reading width direction without depending on the ambient temperature environment.

Embodiment 2. FIG.
Embodiment 2 of the present invention will be described with reference to the drawings. FIG. 8 is a cross-sectional view of the contact image sensor according to the second embodiment. In FIG. 8, reference numeral 40 a denotes a support portion (condensing lens holding rib) that is arranged in the longitudinal direction of the condensing lens 4 and is integrally formed with the condensing lens 4. 40 b is a condensing part of the condensing lens 4, and 40 c is a brim part of the condensing lens 4. In the figure, the same reference numerals as those in FIG. 2 denote the same or corresponding parts.

  The condenser lens 4 emits light scattered in an unnecessary direction in order to effectively irradiate the scattered light from the light scattering layer of the light guide 3 only in a range where the reading object such as the document 1 is disposed. It increases the light irradiation efficiency by having the role of condensing light in the required direction. In consideration of the focal depth performance range of the rod lens array 7, the position where the reading object is arranged is often limited to a range of about several mm or less in the height direction from the transmission body 6, and is limited to that range. It is effective to perform irradiation.

  The condensing lens 4 needs to maintain the positional relationship with the light guide 3 correctly in order to condense on a necessary location. Therefore, as shown in FIG. 9, the condenser lens 4 is provided with a condenser lens holding rib 40a so that the relative relationship between the light guide 3 and the condenser lens 4 is held in the longitudinal direction. The condensing lens 4 prepared as a resin molded product has a length of about 300 mm and is about 10 grams, but when held by the holder 5 located at a position 300 mm away, deflection due to its own weight of about 0.5 mm occurs.

In order to avoid this, by installing the condensing lens holding ribs 40a at about two places with respect to the width of 300 mm, it is possible to improve the illuminance distribution in the irradiating part so as not to be affected.

  The condensing lens holding rib 40a may be separately provided as a separate part, and the light guide 3 and the condensing lens 4 may be installed near the center of the reading width direction. In the second embodiment, the condensing lens 4 is made of resin. The case where it implements without having to carry out an unnecessary individual part and an assembly process by carrying out integral molding with a molded article is explained. In addition, since it is the same as the content demonstrated in Embodiment 1 regarding fixation with the condensing lens 4 and the holder 5, the relationship between the condensing lens 4 and the light guide 3 is demonstrated.

  In FIG. 8, when the condenser lens 4 is subdivided, it is divided into a condenser part 40b and a flange part 40c, and two condenser lens holding ribs 40a integrally formed with the flange part 40c are formed as shown in FIG. The collar portion 40c is spaced from the center of the light collecting portion 40b in the irradiation direction, and the incidence of light from the light emitting portion of the light guide 3 is almost negligible. Therefore, the vicinity of the center in the reading width direction away from the light emitting portion of the light guide 3 or a plurality of condensing lens holding ribs 40a are distributed and arranged.

  As described above, by providing a structure (supporting portion) such as the condensing lens holding rib 40a for making the gap constant between the condensing lens 4 and the light guide 3 along the longitudinal direction, The gap between the condensing lens 4 is fixed not only in the holders 5 positioned at both ends, but also in the vicinity of the center portion, and there is an effect of making irradiation in the reading width direction uniform.

Further, by providing the flange portion 40c for fixing the support portion 40a to the condenser lens 4, the cross section viewed from the reading width direction of the condenser lens 4 becomes longer. Deviations in the installation angle of the optical lens 4 can be minimized.

In the second embodiment, two support portions 40a are arranged in the reading width region. However, one support portion 40a may be arranged in the central portion, and when the light reaches the supporting portion 40a , the entire reading width region is arranged. In addition to the effect of making the gap constant and making the irradiation in the reading width direction uniform, the illumination illuminance of the irradiation unit may be improved by providing an effect as a reflector.

In the first and second embodiments, a flexible substrate is used as the substrate 11. However, in the case where flexibility is not required or the substrate on which the light source 10 with a relatively small number of LEDs and power loss is mounted, the substrate 11 is a glass epoxy substrate or the like. The base material used for the printed wiring board is used, and the metal plate 11a may not be used.

In the first and second embodiments, a transparent resin or a transparent body may be provided in a light propagation region passing through the inside of the holder 5 to provide an optical filter function or a diffusion convergence function. It may not be a hole, but may have a similar configuration according to the cross-sectional shape of the light guide 3. That is, the light guide 3 has an appropriate effect even if the cross section is not only circular but elliptical, polygonal, or a connected type of these shapes.

1 is an exploded perspective view of the overall configuration of a contact image sensor according to Embodiment 1 of the present invention. 1 is a cross-sectional view of a contact image sensor according to Embodiment 1 of the present invention. It is an expanded block diagram explaining fitting of the light guide of the contact | adherence image sensor by Embodiment 1 of this invention, and a condensing lens. It is a partial expansion expansion block diagram explaining fitting with the light guide and holder of the contact | adherence image sensor by Embodiment 1 of this invention. It is a partial expansion expansion block diagram explaining fitting with the condensing lens and holder of the contact | adherence image sensor by Embodiment 1 of this invention. It is a partial expansion expanded configuration figure explaining attachment of a contact type image sensor by Embodiment 1 of this invention. It is an external view explaining positioning fixation of the board | substrate and elastic member of the contact | adherence type image sensor by Embodiment 1 of this invention. It is sectional drawing of the contact type image sensor by Embodiment 2 of this invention. It is an external view of the condensing lens used for the contact | adherence image sensor by Embodiment 2 of this invention.

Explanation of symbols

1..Original (irradiated body) 2..Case 2a..End opening (opening)
3. ・ Light guide 3a ・ ・ Protrusion 4 ・ ・ Condenser lens 4a ・ ・ Protrusion 4b ・ ・ Recess
5 .. Holder 5 a... Hole 5 b... Recess 5 c.. Projection 5 d.. Recess 5 e.. Dowel (projection) 5 f・ Lens body (rod lens array)
8. Sensor IC 9. Sensor board 10. Light source 11. Substrate (flexible substrate) 11a. Sheet metal (metal plate) 11b. Lead terminal 12. Elastic member 12a. Bending part 12c ・ ・ Elastic part 13 ・ ・ Bracket 14 ・ ・ Mounting means (screw)
15 .... Mounting part 40a ... Supporting part (condensing lens holding rib) 40b ... Condensing part 40c ...

Claims (10)

A housing having a mounting portion at an end and housing a component including an imaging optical system, a light guide extending in the reading width direction of the original, and the light guide provided along the light guide A condensing lens comprising a condensing unit for condensing the light emitted from the body and then irradiating the irradiating unit of the document, a condensing lens extending from the condensing unit, and the condensing lens and the light guide It is installed at the end of the body, a hole is provided in the flat plate, the end of the light guide is inserted into one end of the hole to hold the light guide, and the light is condensed outside the hole. a holder for securing the ends of the lens, disposed on the other end side space of the hole of the holder, a light source for incident light to the light guide member extends in the reading width direction of the document, the current The light is disposed on the side opposite to the flange portion with respect to the light portion, and the light irradiated from the condenser lens is reflected by the irradiation portion of the document. A lens array for converging the reflected light, has a lead terminal for supplying power to the light source while placing the light source, a substrate covering the holder wall, the opposite side to the holder through the substrate A bracket installed along a wall surface of the substrate, and a bracket for fixing the holder and the substrate at an attachment portion of the housing using attachment means , the housing containing the lens array and the light guide. A contact type image sensor in which the flange portion is placed on a step portion formed on the opposite side of the lens array with respect to the portion in which the light guide is stored .   The contact image sensor according to claim 1, wherein the substrate includes a flexible substrate that forms the lead terminal and a metal plate.   The contact image sensor according to claim 1, wherein an elastic member is interposed between the substrate and the bracket. The contact image sensor according to claim 3 , wherein the elastic member is a leaf spring.   The contact image sensor according to any one of claims 1 to 4, wherein the condensing lens and the holder are fitted in a notch formed by a notched protrusion. The said light guide and the said holder are fitted by the protrusion part of the edge part of the said light guide , and the hollow part provided in the hole of the said holder. Contact image sensor. The contact type image sensor according to claim 1 , wherein the lens array is in contact with the condenser lens on a side opposite to the flange portion with respect to the condenser portion . Said light source, the light guide and the condensing lens is disposed on both sides perpendicular to the reading width direction with respect to the irradiation unit, the lens array is sandwiched by arranged the condenser lens to the sides The contact image sensor according to claim 7 . The contact image sensor according to any one of claims 1 to 8, wherein the flange portion has a support portion that protrudes toward the light guide body and contacts the light guide body . The contact image sensor according to claim 9 , wherein a plurality of the support portions are arranged along a reading width direction of the document .

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