JP2010268131A - Contact image sensor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a contact image sensor which prevents the occurrence of flaws and deposition of dust on the transport path surface of a target to be irradiated and is stable and is free from distortion of the transport path surface. <P>SOLUTION: The contact image sensor includes: a light source 3 which irradiates a transported target 1 to be irradiated with light; a tabular transmission body 4 which is placed in the irradiation path of light from the light source 3 and transmits the light; a lens body 5 which converges reflected light reflected by the target 1; a light receiving portion 6 which receives the light converged by the lens body 5; a sensor substrate 7 having the light receiving portion 6 placed thereon; a first casing 8 wherein the light source 3, the lens body 5, and the sensor substrate 7 are stored; and a second casing 9 which is fitted and fixed to the first casing 8 and has a plurality of projections 9a brought into contact with the transmission body 4 in a plane parallel to a transport direction and is disposed so as to surround the transmission body 4. A space between the transmission body 4 and the second casing 9 except for the projections 9a is filled with an adhesive 11. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

The present invention relates to a contact image sensor used for image reading by a copying machine, a scanner, or the like or bill reading by a financial terminal device or the like.

The transport path surface of the object to be irradiated of the image sensor is required to transmit light and to be scratched by an original or bill passing therethrough and to be easily transported. For example, FIG. 1 of Japanese Patent Laid-Open No. 2000-312281 (see Patent Document 1) shows the surface of the transparent cover 1 manufactured by resin molding so as to prevent the surface of the transparent cover from being scratched causing image quality degradation. An image sensor is disclosed in which a concave groove 10 having inclined surfaces 10a and 10b and a bottom surface 10c is provided in 1a.

Further, FIG. 1 (see Patent Document 2) of Japanese Patent Laid-Open No. 2000-236415 shows a cover made by resin molding in order to increase the impact resistance of the entire transparent cover and prevent breakage such as cracks. An image sensor is disclosed in which a glass 20 fitted in the concave groove 11 of the main body 10 is provided and the entire surface of the cover 1 is a flat surface having no step.

Japanese Patent Laid-Open No. 2000-312281 (FIG. 1) JP 2000-236415 A (FIG. 1)

However, in the one disclosed in Patent Document 1, the concave groove 10 having the inclined surfaces 10a and 10b is provided in the resin-molded transparent cover 1, so that the original does not get caught in the concave groove 10 even if the concave groove 10 is formed deeply. However, there is a problem in that the inclined angles of the formed inclined surfaces 10a and 10b vary and the dust in the concave groove 10 cannot be sufficiently removed.

Moreover, in the thing of patent document 2, since the glass 20 is engage | inserted in the ditch | groove 11 of the cover main body 10 resin-molded, it is possible not to generate the damage | wound which generate | occur | produces on the surface of the transparent cover 1. FIG. However, since the transparent cover 1 having a relatively deep groove is required, there is a problem that distortion occurs in the cover body 10 during resin molding, and it is difficult to obtain a stable document running surface.

The present invention has been made to solve the above-described problems, and prevents the generation of scratches and the adhesion of dust on the transport path surface of the irradiated object, and is a stable contact type that does not cause distortion on the transport path surface. An object is to provide an image sensor.

A contact image sensor according to a first aspect of the present invention is a light source that irradiates light to an object to be transported, a flat plate-like transmissive body that is interposed in an irradiation path of light from the light source and transmits light, A lens body that converges the reflected light reflected by the irradiated body, a light receiving unit that receives the light converged by the lens body, a sensor substrate on which the light receiving unit is placed, the light source, the lens body, and the sensor A first housing that accommodates a substrate; and the transmission body that is fitted and fixed to the first housing and that is in contact with the transmission body at a plurality of protrusions on a surface parallel to a conveyance direction. A second casing disposed so as to surround the adhesive, and a gap between the transparent body and the second casing excluding the protruding portion is filled with an adhesive.

According to a second aspect of the present invention, there is provided the contact image sensor according to the first aspect, wherein an inclined portion is provided at an end portion of the second casing across the reading width direction of the irradiated object.

According to the first aspect of the present invention, a permeation body having a scratch resistance is provided in a region located in the conveyance path of the irradiated body, an inexpensive resin material is disposed around the permeation body, and the permeation body and the resin material are provided. Since the adhesive is filled in the gap, there is an effect that it is possible to prevent document scratches and dust from being attached, and to obtain a stable contact type image sensor having good flatness and no distortion on the surface of the conveyance path.

According to the second aspect of the present invention, since the inclined portion is provided at the paper feed side end of the second casing, in addition to the effect of the first aspect, even if there is a transport blur of the irradiated object, the second casing is stable. There is an effect of obtaining a contact image sensor capable of feeding paper.

1 is a cross-sectional configuration diagram of a contact image sensor according to Embodiment 1 of the present invention. FIG. 1 is a plan view of a contact image sensor according to Embodiment 1 of the present invention. 1 is a side view including a drive system for a contact image sensor according to Embodiment 1 of the present invention. FIG. It is sectional drawing explaining the relationship between the cover and transmission body of the contact | adherence type image sensor by Embodiment 1 of this invention. FIG. 5A is a manufacturing flow of a contact image sensor according to Embodiment 1 of the present invention, FIG. 5A shows a placement process, FIG. 5B shows a compression process, and FIG. 5C shows a finishing process. It is Example 2 top view of the contact | adherence image sensor by Embodiment 1 of this invention. It is Example 3 top view of the contact | adherence image sensor by Embodiment 1 of this invention.

Embodiment 1 FIG.
Embodiment 1 of the present invention will be described below with reference to the drawings. FIG. 1 is a cross-sectional configuration diagram of a contact image sensor according to Embodiment 1 of the present invention. In FIG. 1, reference numeral 1 denotes an object to be irradiated such as a document or banknote, 2 a platen roller for conveying the document 1, 3 a light guide to which an LED or the like is added, and a fluorescent tube to emit light over the reading width direction of the document 1. A light source for irradiation, 3a is a light emitting portion of the light source 3. Reference numeral 4 denotes a flat plate transparent member made of a glass plate such as soda glass, 5 denotes a rod lens array (lens body) for converging the reflected light reflected from the original 1, and 6 denotes a light receiving unit for receiving the light converged by the lens body 5. Unit (sensor IC), 7 is a sensor substrate on which the light receiving unit 6 is placed, 8 is a first housing that houses or holds the light source 3, the lens body 5 and the sensor substrate 7, and 9 holds and transmits the transmissive body 4. A resin-molded cover (second casing) 10 that forms a conveyance path of the document 1 together with the body 4 is an input / output connector for driving the image sensor. In the drawings, the same reference numerals indicate the same or corresponding parts.

FIG. 2 is a plan view of the contact image sensor according to the first embodiment of the present invention. In FIG. 2, reference numeral 9 a denotes a protrusion of the cover 9 which is integrally formed inside the cover 9 configured with a hollow region and is provided so as to be flush with the conveyance path surface, and 9 b is the conveyance direction of the document 1. Is an inclined portion of the cover 9 provided over the reading width region of the document 1 orthogonal to the. Reference numeral 11 denotes an adhesive such as thermosetting or room temperature curable filling the gap between the cover 9 and the transmission body 4. In the figure, the same reference numerals as those in FIG. 1 denote the same or corresponding parts.

FIG. 3 is a side view including the drive system of the contact image sensor according to the first embodiment of the present invention. In FIG. 3, reference numeral 8 a denotes a mounting hole for fitting and fixing the first housing 8 and the second housing (cover) 9, and 12 denotes a gap between the transmission body 4 and the platen roller 2, which holds the platen roller 2. A conveyance guide 13 for setting the angle is a fixing means such as a screw for fixing the conveyance guide 12 and the first housing 8 at the end. In the figure, the same reference numerals as those in FIG. 1 denote the same or corresponding parts.

FIG. 4 is a cross-sectional view for explaining the relationship between the cover and the transparent body of the contact image sensor according to Embodiment 1 of the present invention. In FIG. 4, reference numeral 9 c denotes a positioning portion (positioning pin) that is provided integrally with the cover 9 and is fitted and fixed to the first housing 8. In the figure, the same reference numerals as those in FIG. 2 denote the same or corresponding parts.

Next, the flatness of the conveyance path of the document 1 composed of the transmission body 4 and the cover 9 will be described with reference to FIG. FIG. 5 is a manufacturing flow of the image sensor according to the first embodiment of the present invention. FIG. 5 (a) is a mounting process for mounting the transmission body 4 and the cover 9 on a flat surface, and FIG. FIG. 5C shows a finishing process in which the adhesive 11 is applied to the gap between the transmissive body 4 and the cover 9, respectively. 5, the same reference numerals as those in FIG. 4 denote the same or corresponding parts.

5A, in the placing process, a soft material 20 such as a sheet or tape is placed on a reference table 30 such as a surface plate or work table having high flatness, and a cover 9 is placed thereon, and the cover 9 The transmitting body 4 is abutted against the protrusion 9 a and placed on the soft material 20. Further, a protective tape 21 for preventing scratches is attached to the transparent body 4 in advance on the opposite side of the transparent body 4 that does not contact the soft material 20.

In the compression step shown in FIG. 5B, the transmission body 4 and the cover 9 are softened by a compression jig 31 made of metal on which a dispenser 32 movable with respect to a plane parallel to the conveyance direction in which the adhesive 11 is stored is mounted. It arrange | positions so that it may press on the material 20, and the flatness of the transmission body 4 and the cover 9 which subverted the flatness of the reference | standard stand 30 by interposition of the soft material 20 is ensured.

Next, compressed air or nitrogen gas is sent to the dispenser 32, the dispenser 32 is run, and the adhesive 11 is filled in the gap between the transparent body 4 and the cover 9 on the rectangular plane including the conveying direction from the nozzle of the dispenser 32. . Since the adhesive 11 is filled from the opposite side of the transparent body 4 that does not come into contact with the soft material 20, the transmission surface side of the original 4 of the transparent body 4 and the cover 9 is the adhesive application area except for the protrusion 9a of the cover 9. A uniform parallel surface is formed with no step including In addition, the process of apply | coating the adhesive agent 11 with the dispenser 32 is called a dispensing process. Thereafter, the adhesive 11 is cured. When the adhesive 11 is an overheat-curing type, it is cured using a heating furnace, and when it is an ultraviolet-curing type, it is cured using a UV furnace.

Next, in the finishing process, as shown in FIG. 5C, the compression jig 31 and the protective tape 21 are removed, and then the joined body of the transmission body 4 and the cover 9 is washed.

Next, the operation will be described. Light emitted from the light source 3 passes through the transmissive body 4 and irradiates the document 1 conveyed by the platen roller 2. The image information reflected by the document 1 is converged as reflected light by the rod lens array 5 through the transmissive body 4, and the light converged by the rod lens array 5 is imaged by the light receiving unit 6. The document 1 is transported by the platen roller 2, but the side perpendicular to the transport direction on the paper feeding side may not always be fed in parallel with the transport direction due to transport blur of the document 1 or bending of the document 1. In order to absorb the change in the one transport path, the end portion is provided with an inclined portion 9b across the reading width direction of the cover 9 to ensure a stable transport path.

Further, in the gap between the surface of the cover 9 on the transport path side and the surface of the transport path side transparent body 4, the adhesive 11 is removed except for the protruding portion 9 a where the adhesive 11 of the cover 9 is not applied to the surface forming the transport path. Is uniformly filled. Accordingly, the document 1 passes through the conveyance path without any obstacle.

As described above, according to the first embodiment, a cover 4 having a scratch resistance higher than that of a resin is provided in a region located on the conveyance path (traveling surface) of the document 1, and the cover 4 is made of an inexpensive resin around the transparent body 4. 9 is disposed, and the adhesive 11 is filled between the transmissive body 4 and the cover 9 so as to make up the gap between the transmissive body 4 and the cover 9, so that the transport path surface is flat. Accordingly, it is possible to obtain a stable contact type image sensor having good flatness and no distortion, and an inclined portion 9b is provided at the end portion of the cover 9, so that stable feeding can be performed even if the document 1 is blurred. It is. Further, since the transmissive body 4 is made of a highly scratch-resistant glass plate, there is no scratch due to the document 1, and a good reading image quality can be stably obtained.

Further, since the adhesive 11 is uniformly applied to the gap between the transmissive body 4 and the cover 9 by the dispenser 32, a sealed space is formed between the first housing 8 and the cover 9 to which the transmissive body 4 is joined. Thus, since there is no entry of foreign matter adhering to the light source 3 or the lens body 5, stable optical performance of the image sensor can be maintained. Further, since the first housing 8 and the cover 9 can be attached and detached by the positioning pins 9c provided on the cover 9, the inclination angle of the inclined portion 9b of the cover 9 can be easily changed even if the setting path is changed in the conveyance path of the document 1. There is also an effect that it can be changed to.

In the first embodiment, the cover 9 is locally provided with a plurality of protrusions 9a. However, as shown in FIG. 6, a cover 90 is used instead of the cover 9 and a plurality of corrugated protrusions 90a are used. There is also a corresponding effect.

In the first embodiment, the mounting holes 8a for receiving the positioning pins 9c are provided in the first housing 8 with respect to the positioning pins 9c of the cover 9. However, two positioning pins are arranged on the two straight lines in the longitudinal direction. 9c and attachment holes 8a are provided, and one of the attachment holes 8a provided at two locations on the straight line is formed into a long hole shape in the straight upward direction, so that the first housing 8 and the cover 9 can be connected to the first housing 8 and the cover 9 due to temperature changes at the long hole portions. Stress generated by dimensional changes due to differences in linear expansion coefficient can be relaxed.

In the first embodiment, the transmissive body 4 is made of a glass plate such as soda glass, but may be a high-hardness resin such as polymethyl methacrylate resin (PMMA).

In the first embodiment, the shape of the transmissive body 4 is a rectangular plane. However, as shown in FIG. 7, the transmissive portion 40 is used instead of the transmissive body 4, and the dent portion 40 a is located at a position facing the projection 9 a of the cover 9. As a result, the positioning of the transmissive body 40 is facilitated, the bonding area of the transmissive body 40 is increased, and the bonding force between the transmissive body 40 and the cover 9 is increased. In the figure, the same reference numerals as those in FIG. 2 denote the same or corresponding parts.

DESCRIPTION OF SYMBOLS 1 ... To-be-irradiated body (a banknote, an original, etc.) 2 ... Platen roller 3 ... Light source 3a ... Light-emitting part 4 ... Transmission body (glass plate)
5 ... Lens body (rod lens array)
6... Light receiving portion (sensor IC) 7... Sensor substrate 8... First housing 8 a.
9a: Protruding part 9b: Inclined part 9c: Positioning part (positioning pin)
10 ... Connector (I / O connector)
DESCRIPTION OF SYMBOLS 11 ... Adhesive 12 ... Platen guide (conveyance guide) 13 ... Screw (fixing means)
DESCRIPTION OF SYMBOLS 20 ... Soft material 21 ... Masking tape 30 ... Reference | standard stand (surface plate) 31 ... Compression jig 32 ... Dispenser 40 ... Transmission body 40a ... Recessed part 90 ... Second housing (cover) 90a... Projection 90b.

Claims (2)

A light source that irradiates light to the object to be transported, a flat plate-like transparent body that is interposed in an irradiation path of light from the light source, and a lens body that converges the reflected light reflected by the object to be irradiated A light receiving unit that receives light converged by the lens body, a sensor substrate on which the light receiving unit is placed, a first housing that houses the light source, the lens body, and the sensor substrate, A second housing disposed so as to surround the transmission body which is fixed by fitting with the housing and is in contact with the transmission body at a plurality of protrusions on a surface parallel to the transport direction; A contact-type image sensor in which a gap is filled with an adhesive between the transmission body and the second casing excluding the protrusion. The contact image sensor according to claim 1, wherein an inclined portion is provided at an end portion of the second casing across the reading width direction of the irradiated object.

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