JPH10178512A - Contact type image sensor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a contact type image sensor which is able to accurately read an image of a rugged face to be read. SOLUTION: This image sensor has a cover glass 2 whose surface is pressed into contact with a face to be read 11 at image reading time, a case 1 supporting the cover glass 2, a light emitting diode chip 7 that emits the face to be read 11 via the cover glass 2 and a MOS type image sensor chip 6 that receives a reflected light in the face to be read 11 passing through the cover glass 2. In this case, in the vicinity of an incident position of the reflected light from the face to be read 11 on the surface of the cover glass 2, that is, a projected part 2a of the cover glass 2 is projected toward the face to be read 11 side higher than its peripheral parts.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a contact type image sensor for reading an image on a surface to be read and converting it into an electric signal by bringing the image into close contact with the surface to be read such as a document.

[0002]

2. Description of the Related Art In recent years, even in a facsimile apparatus and the like, an image sensor portion for reading an original has been removed and used as a handy type image sensor so that an image of a book or the like can be read. Products have appeared on the market, and demand for image sensors that can be used as handy types is expected to increase.

Further, unlike a conventional handy type copying machine, a facsimile machine needs to read a large document such as A4 size or B4 size, so that the length of the image sensor becomes longer, and the overall size becomes larger. However, this is inconvenient as a handy type, and there is a strong demand for minimizing elements other than length as much as possible.

There are two types of image sensors: a reduced image forming type that generally uses a CCD, and a close contact type that generally uses a phototransistor. In the reduced image forming method, the optical path length becomes longer and the size becomes larger. Therefore, it is not preferable as a handy type image sensor. That is, as a handy type image sensor, a contact type image sensor that can be downsized is preferable.

A conventional contact-type image sensor generally has a configuration as shown in FIG. That is, case 81
Thereby, the cover glass 82, the rod lens 83, the first substrate 84, and the second substrate 85 are supported. On the upper surface of the first substrate 84, a MOS image sensor chip 86 is mounted, and on the upper surface of the second substrate 85,
The light emitting diode chip 87 is mounted. The light radiated from the light emitting surface of the light emitting diode chip 81 is reflected by a surface to be read such as a document in contact with the upper surface of the cover glass 82, and the reflected light is received by the MOS type image sensor chip 86 by the rod lens 83. By forming an image on the surface, an electric signal corresponding to the image of the surface to be read is output from the MOS image sensor chip 86. That is, since the surface to be read comes into contact with the upper surface of the cover glass 82, the image at the incident position 88 of the reflected light from the surface to be read, which is linearly formed on the upper surface of the cover glass 82, is The arrangement position of the rod lens 83 is adjusted so that an image is formed on the light receiving surface.

In such a conventional contact type image sensor, there is no particular problem in a system in which the original is firmly held by the platen roller and the read surface of the original is read, but the contact type image sensor is held by hand. Press against the surface to be read,
When used as a so-called handy type that moves on the surface to be read, if the surface to be read is a concave curved surface or has minute irregularities, defocus occurs and a clear reproduced image is obtained. There was a problem that can not be.

That is, as shown in FIG. 24, if the cover glass 82 of the contact image sensor 91 is moved in the direction of the arrow while making contact with the surface 92 to be read, the incident position 88 of the contact image sensor 91 is included. Since the plane is very wide, the contact type image sensor 9
In the case where there are a plurality of irregularities parallel to the length direction 1, the contact type image sensor 91 rides on the protruding ends of the plurality of convexes on the surface to be read 92 due to the irregularities.
A gap L is formed between the groove 8 and the bottom of the recess. If the length of the gap L exceeds the depth of focus of the rod lens 83, the image of the surface to be read 92 will not be correctly formed on the light receiving surface of the MOS image sensor chip 86, and accurate reading will not be possible.

In the case of a general contact type image sensor, the depth of focus is about 0.6 mm. Therefore, if there are a plurality of irregularities exceeding about 0.6 mm in height on the surface to be read, defocus will occur. .

In the case of the image sensor of the reduced image formation method, the depth of focus is relatively large, about 2 mm, which is advantageous for unevenness on the surface to be read. However, as described above, miniaturization is difficult. Therefore, it is not preferable as a handy type image sensor.

[0010]

DISCLOSURE OF THE INVENTION The present invention was conceived in view of the above circumstances, and provides a contact image sensor capable of accurately reading an image of a surface to be read having irregularities. The subject.

In order to solve the above problems, the present invention takes the following technical measures.

According to a first aspect of the present invention, there is provided a contact type image sensor having a light emitting means for irradiating a surface to be read at the time of reading, and a light receiving means for receiving light reflected on the surface to be read, Near the incident position of the reflected light from the surface to be read,
A contact-type image sensor is provided, wherein a protruding portion protruding toward the surface to be read is provided.

With this configuration, even if there are a plurality of irregularities parallel to the length direction of the contact type image sensor on the surface to be read, the projecting portions enter the concave portions of the surface to be read at the time of reading. Since the image can be satisfactorily avoided and the image on the surface to be read can be accurately read, a clear reproduced image can be obtained.

That is, when a projection is provided near the incident position, the projection end of the projection comes into contact with the surface to be read, regardless of the presence or absence of irregularities on the surface to be read. Is always substantially constant, and no defocus occurs.

According to the second aspect of the present invention, a transparent body whose surface comes into contact with the surface to be read at the time of reading, a case for supporting the transparent body, and a light emitting means for irradiating the surface to be read with the transparent body interposed therebetween. A contact type image sensor having light receiving means for receiving reflected light reflected by the surface to be read and passing through the transparent body, wherein the vicinity of the incident position of the reflected light from the surface to be read on the surface of the transparent body is A contact-type image sensor is provided which protrudes from the peripheral portion toward the surface to be read.

With this arrangement, even if the surface to be read has irregularities, the vicinity of the incident position of the transparent body enters the concave portion of the surface to be read at the time of reading, so that a gap is formed between the bottom of the concave portion and the incident position. Defocus caused by the occurrence can be favorably avoided. As a result, the image on the surface to be read can be accurately read,
A clear reproduced image can be obtained.

According to a preferred embodiment, the transparent body is substantially flat, and a transparent band-like projection is provided on a part of the surface, and the incident position is set on the surface of the projection.

With this configuration, the width of the transparent body can be made larger than the width of the protruding portion, and the width of the transparent body does not become too small. Therefore, handling of the transparent body during assembly is easy.

According to another preferred embodiment, at least a part of the surface of the projecting portion projects in a curved shape in the width direction, and the incident position is set at the projecting end.

With this arrangement, the position of incidence can be made even closer to the bottom of the concave portion of the surface to be read at the time of reading, so that defocus can be prevented more favorably.

According to another preferred embodiment, the transparent body has a strip shape, and the transparent body is attached to the case so that the surface protrudes from the surface of the case, and the incident position is set on the surface of the transparent body. .

In this case, it is not necessary to form a projection on a part of the surface of the transparent body, and the transparent body can be easily manufactured.

According to another preferred embodiment, at least a part of the surface of the transparent body projects in a curved shape in the width direction, and the incident position is set at the projecting end.

With this configuration, the incident position can be made closer to the bottom of the concave portion of the surface to be read at the time of reading, so that the defocus can be prevented more favorably.

According to another preferred embodiment, the transparent body is attached to the upper surface of the case, and the upper surface of the case is such that at least one of both sides in the width direction of the transparent body is farther from the transparent body. It is inclined so as to approach the lower surface of the case.

With this arrangement, the upper surface of the case does not interfere with the reading operation, and the transparent body can be inserted to the bottom of the concave portion, so that the defocus can be more effectively prevented.

According to another preferred embodiment, the surface of the case is substantially rectangular in cross section, and a transparent body is arranged at one of the four corners of the rectangle.

According to this configuration, the same effect as that of the case can be obtained without projecting the transparent body from the upper surface of the case or inclining the upper surface of the case.

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

[0030]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the present invention will be specifically described below with reference to the drawings.

FIG. 1 is a cross-sectional view in the width direction of a contact type image sensor according to the present invention. In a space inside a rectangular case 1, a cover glass 2 as an example of a transparent body, a rod lens 3, A first substrate 4 and a second substrate 5 are provided. On the first substrate 4, a plurality of MOS type image sensor chips 6 as an example of light receiving means are mounted. On the second substrate 5, a plurality of light emitting diode chips 7 as an example of light emitting means are mounted. On the upper surface of the cover glass 2, a protruding portion 2 a is integrally provided so as to protrude. Except for the protruding portion 2 a, the upper surface of the cover glass 2 is substantially flush with the upper surface of the case 1.

The case 1 is made of, for example, resin and holds a cover glass 2, a rod lens 3, a first substrate 4, and a second substrate 5. The cover glass 2 is made of glass, and has a band-like and downwardly extending projection 2a formed by chemical etching or grinding. The protruding portion 2 a is formed over the entire length or substantially the entire length of the cover glass 2 in the length direction, and the protruding end is a flat surface parallel to the upper surface of the cover glass 2. Projection 2
The both side surfaces in the width direction a are flat, but may be curved surfaces protruding outward. At the time of reading, the protruding end of the protruding portion 2 a contacts the surface 11 to be read. The rod lens 3
For example, it is composed of a selfoc lens array, and the reflected light from the surface to be read 11 forms an image on the light receiving surface of the MOS image sensor chip 6. The first substrate 4 supports the MOS image sensor chip 6 and has a power supply to the MOS image sensor chip 6 and a wiring pattern for input / output of various signals. The second substrate 5 supports the light emitting diode chip 7 and has a wiring pattern for supplying power to the light emitting diode chip 7. Each MOS image sensor chip 6 has a large number of light receiving surfaces, receives light reflected from the surface 11 to be read, and outputs an electric signal corresponding to the light. Multiple MOS
The pattern image sensor chips 6 are arranged in a line along the length direction of the first substrate 4 so that all of the light receiving surfaces are substantially at the same pitch. Each light emitting diode chip 7
Emits light for irradiating the surface 11 to be read. The plurality of light emitting diode chips 7 are arranged at substantially equal pitches along the length direction of the second substrate 5.

The light emitted from the light emitting diode chip 7 at the time of reading passes through the cover glass 2, is reflected by the surface 11 to be read, passes through the cover glass 2, and enters the rod lens 3. This reflected light forms an image on the light receiving surface of the MOS image sensor chip 6 by the rod lens 3. Thus, the MOS-type image sensor chip 6 outputs an electric signal corresponding to an image of one line on the surface 11 to be read. Therefore, the image on the surface 11 to be read can be read by moving the contact type image sensor while the protruding portion 2a of the cover glass 2 is in contact with the surface 11 to be read.

That is, the linear incident position 12 on which the reflected light from the reading surface 11 is incident is formed at the projecting end of the projecting portion 2a of the cover glass 2, and the image at the incident position 12 is a MOS type image sensor chip. The position of the rod lens 3 is adjusted so that an image is formed on the light receiving surface 6.

This contact type image sensor is designed such that, assuming a virtual plane perpendicular to the optical axis of the light reflected from the surface to be read and including the position where the light reflected from the surface to be read enters the transparent body, It can be said that all portions other than the vicinity of the position are located at a predetermined distance or more on the light receiving unit side with respect to the virtual plane. Specifically, assuming a virtual plane perpendicular to the optical axis 13 of the light reflected from the surface 11 to be read and including the incident position 12 of the light reflected from the surface 11 to the cover glass 2, This means that all parts other than the vicinity of the position 12 are located at a predetermined distance or more on the MOS image sensor chip 6 side with respect to the virtual plane. Incidentally, in FIG. 1, the virtual plane coincides with the surface 11 to be read, and the vicinity of the incident position 12 corresponds to the protrusion 2a.

Holding such a close contact type image sensor by hand, as shown in FIG.
Is moved in the direction of the arrow while making the protruding end thereof contact the surface 11 to be read, even if the surface 11 to be read has a plurality of irregularities parallel to the length direction of the contact type image sensor, the surface 11 Projecting portion 2a enters the concave portion 11a. Therefore, there is no gap beyond the depth of focus of the rod lens 3 between the bottom of the concave portion 11a of the reading surface 11 and the incident position 12 formed at the protruding end of the protruding portion 2a. Absent.

The width and height of the protruding portion 2a of the cover glass 2 may be appropriately determined according to the difference in height of the unevenness of the surface 11 to be read. In general, the width of the protruding portion 2a is 5 mm or less. It is considered to be. Of course, the length of the contact image sensor is determined according to the reading width of the document.

It is to be noted that, instead of the cover glass 2 integrally formed with the protruding portion 2a, as shown in FIG. 3, a cover glass 17 in which a band-shaped glass 16 is fitted into a flat transparent resin plate 15 is used. Is also good.

Further, instead of the cover glass 2 having the projecting portion 2a having a trapezoidal cross section, as shown in FIG. 4, the cover glass 21 having the projecting portion 21a whose entire surface is curved is projected.
Alternatively, as shown in FIG. 5, a cover glass 22 in which a part of the surface protrudes a curved protruding portion 22a may be used. The curved surfaces of the protrusions 21a and 22a may have a cross section that is a part of a circle or a part of an ellipse. The incident position 12 is set at a curved protruding end which is a protruding end of the protruding portions 21a and 22a.

As shown in FIG. 6, a cover glass 25 having the same width as that of the projecting portion 2a is used in place of the cover glass 2 in which the projecting portion 2a is integrally formed.
Cover glass 25 so as to protrude from the upper surface of case 1
It may be attached to.

In place of the cover glass 25 whose upper half has a trapezoidal cross section, a cover glass 26 whose entire surface protrudes from the upper surface of the case 1 is curved as shown in FIG. Alternatively, as shown in FIG.
A part of the surface of the portion projecting from the upper surface of the cover glass 27 may be a curved cover glass 27. The curved surfaces of the cover glasses 26 and 27 may have a section that is a part of a circle or a part of an ellipse. The incident position 12 is a cover glass 26,
27 are set as the protruding ends of the curved surface which are protruding ends.

In place of the case 1 having a horizontal upper surface,
As shown in FIG. 9, a case 31 may be used in which one end in the width direction of the upper surface is a slope 31a. This slope 31a is
The case 31 moves away from the cover glass 32.
Is inclined so as to approach the lower surface. In this case, as shown in FIG. 9, the cover glass 3 has a trapezoidal cross section in the width direction.
2, the side surface 32 at one end in the width direction of the cover glass 32
It is preferable that the upper surface of the cover glass 32 be inserted deeper into the concave portion 11a of the surface 11 to be read if the surface a is flush with the inclined surface 31a of the case 31.

Instead of the cover glass 32 having a trapezoidal cross section in the width direction, a cover glass 33 having a substantially curved upper half as a whole may be used as shown in FIG. As shown, a cover glass 34 having a curved upper surface may be used. The curved surfaces of the cover glasses 33 and 34 may have a cross section that is a part of a circle or a part of an ellipse. The incident position 12 is set to cover glasses 33 and 34.
Is set to the protruding end of the curved surface.

Instead of the case 31 in which one end in the width direction of the upper surface is a slope 31a, a case 35 in which both sides in the width direction of the cover glass 32 are slopes 35a and 35b is used as shown in FIG. Is also good. In this way, the upper surface of the cover glass 32 can be inserted deeper into the concave portion 11a of the surface 11 to be read. In this contact type image sensor, the MOS image sensor chip 6 and the light emitting diode chip 7 are mounted on a common substrate 39, and light from the light emitting diode chip 7 is guided to the surface to be read by the light guide plate 38.

Further, instead of the cover glass 32 having a trapezoidal cross section in the width direction, a cover glass 36 having a substantially upper half as a whole as shown in FIG. 13 may be used. As shown, a cover glass 37 having a partially curved upper surface may be used. The curved surfaces of the cover glasses 36 and 37 may have a cross section that is a part of a circle or a part of an ellipse. The incident position 12 is set to cover glasses 36 and 37.
Is set to the protruding end of the curved surface.

Also, instead of the case 35 in which both sides in the width direction of the cover glass 32 are slopes 35a and 35b, FIG.
As shown in FIG. 5, a case 42 that can hold the cover glass 41 at the corners may be used. The case 42 has a substantially rectangular cross section, and the cover glass 41 is arranged at one of the four corners of the rectangle. The cover glass 41 is
The cross-sectional shape in the width direction is rectangular. Also in such a contact type image sensor, as shown in FIG. 16, the cover glass 41 is moved in the arrow direction while the surface of the cover glass 41 is in contact with the surface 11 to be read, so that the cover glass 41 Fit in.

Further, instead of the cover glass 41 having a rectangular cross section in the width direction, a cover glass 43 whose entire upper half portion has a curved surface may be used as shown in FIG. As shown, a cover glass 44 having a curved upper surface may be used. The curved surfaces of the cover glasses 43 and 44 may have a section that is a part of a circle or a part of an ellipse. The incident position 12 is set to cover glasses 43 and 44.
Is set to the protruding end of the curved surface.

In place of the case 42 for supporting the rod lens 3 at an angle to the lower surface, a case 51 for supporting the rod lens 3 perpendicular to the lower surface may be used as shown in FIG. . The cover glass 53 has a substantially rectangular cross section in the width direction. In this contact type image sensor, the optical axis 13 of the light reflected from the surface 11 to be read is bent on the back surface of the cover glass 53, whereas the optical axis 52 of the light incident on the surface 11 to be read is It is a straight line from the light emitting diode chip 7 to the surface 11 to be read. In this contact image sensor, when assuming a virtual plane that is orthogonal to the optical axis of the light incident on the surface to be read and that includes a linear incident position on the transparent body of the light reflected from the surface to be read, All parts except near the incident position formed on the surface of the transparent body,
It can be said that it is located at a predetermined distance or more on the light receiving means side with respect to the virtual plane. Specifically, the surface to be read 1
1 is a line-shaped incident position 12 orthogonal to the optical axis 52 of the light incident on the cover glass 41 and reflected from the surface to be read.
Assuming a virtual plane that includes the MOS image sensor chip 6 with respect to the virtual plane, except for the vicinity of the incident position 12 formed on the surface of the cover glass 53.
Side is located at a predetermined distance or more. Incidentally, in FIG. 19, the virtual plane coincides with the surface of the cover glass 53, and the vicinity of the incident position 12 corresponds to the cover glass 53.

In place of the cover glass 53 having a substantially rectangular cross section in the width direction, a cover glass 55 having a substantially curved upper half as a whole may be used as shown in FIG. As shown in FIG. 7, a cover glass 56 having a part of the upper surface curved may be used. The curved surfaces of the cover glasses 55 and 56 may have a section of a circle or a part of an ellipse. The incident position 12 is set to cover glass 55,
56 are set at the protruding ends of the curved surfaces.

When both the optical axis of the light incident on the surface to be read and the optical axis of the light reflected from the surface to be read bend on the back surface of the transparent body, the surface of the transparent body moves to the surface to be read. The angle between the optical axis of the incident light and the optical axis of the light reflected from the surface to be read is 2
Assuming an imaginary plane that is orthogonal to the straight line that divides equally and that includes the linear incident position of the reflected light from the surface to be read on the transparent body, everything except the vicinity of the incident position formed on the surface of the transparent body May be configured so as to be located at a predetermined distance or more on the light receiving means side with respect to the virtual plane. Specifically, when both the optical axis of the light incident on the surface to be read and the optical axis of the light reflected from the surface to be read are bent at the back surface of the cover glass, the surface of the cover glass faces the surface to be read. Is perpendicular to a straight line that bisects the angle between the optical axis of the incident light and the optical axis of the reflected light from the surface to be read, and the linear incident position of the reflected light from the surface to be read onto the cover glass. Assuming a virtual plane that includes the cover glass, all parts other than the vicinity of the incident position formed on the surface of the cover glass are configured to be located at a predetermined distance or more from the virtual plane on the MOS image sensor chip side. It is.

Further, the upper surface of the cover glass 25 is
Instead of protruding from the upper surface of, as shown in FIG.
Projection portions 62 located on both sides in the width direction of cover glass 61
A cover 62 having a and 62b may be used. The protrusions 62a and 62b are formed over the entire length or substantially the entire length of the cover 62 in the length direction. Also in such a contact type image sensor, since the protruding ends of the protruding portions 62a and 62b are in contact with the reading surface 11, the same effect as the contact type image sensor shown in FIG. 6 can be obtained.

It is to be noted that projecting portions may be provided on both sides in the width direction of the cover glass at appropriate intervals in the length direction of the case.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view in a width direction of a contact image sensor according to an embodiment of the present invention.

FIG. 2 is an explanatory diagram of a use state of the contact type image sensor shown in FIG.

FIG. 3 is an explanatory view of a modified example of a cover glass in the contact image sensor shown in FIG. 1;

FIG. 4 is a cross-sectional view in a width direction of a contact image sensor according to another embodiment.

FIG. 5 is a cross-sectional view in a width direction of a contact image sensor according to still another embodiment.

FIG. 6 is a cross-sectional view in a width direction of a contact image sensor according to still another embodiment.

FIG. 7 is a cross-sectional view in a width direction of a contact image sensor according to still another embodiment.

FIG. 8 is a cross-sectional view in a width direction of a contact image sensor according to still another embodiment.

FIG. 9 is a cross-sectional view in a width direction of a contact image sensor according to still another embodiment.

FIG. 10 is a cross-sectional view in a width direction of a contact image sensor according to still another embodiment.

FIG. 11 is a cross-sectional view in a width direction of a contact image sensor according to still another embodiment.

FIG. 12 is a cross-sectional view in a width direction of a contact image sensor according to still another embodiment.

FIG. 13 is a cross-sectional view in a width direction of a contact image sensor according to still another embodiment.

FIG. 14 is a cross-sectional view in a width direction of a contact image sensor according to still another embodiment.

FIG. 15 is a cross-sectional view in a width direction of a contact image sensor according to still another embodiment.

FIG. 16 is an explanatory diagram of a use state of the contact image sensor illustrated in FIG. 15;

FIG. 17 is a cross-sectional view in a width direction of a contact image sensor according to still another embodiment.

FIG. 18 is a cross-sectional view in a width direction of a contact image sensor according to still another embodiment.

FIG. 19 is a cross-sectional view in a width direction of a contact image sensor according to still another embodiment.

FIG. 20 is a cross-sectional view in a width direction of a contact image sensor according to still another embodiment.

FIG. 21 is a cross-sectional view in a width direction of a contact image sensor according to still another embodiment.

FIG. 22 is a cross-sectional view in a width direction of a contact image sensor according to still another embodiment.

FIG. 23 is a cross-sectional view of a conventional contact image sensor in a width direction.

FIG. 24 is an explanatory diagram of a use state of the contact image sensor shown in FIG. 23;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Case 2 Cover glass 2a Projection part 3 Rod lens 4 First substrate 5 Second substrate 6 MOS type image sensor chip 7 Light emitting diode chip 11 Reading surface 11a Depression 12 Incident position 13 Optical axis 17 Cover glass 21 Cover glass 21a Projection 22 Cover glass 22a Projection 25 Cover glass 26 Cover glass 27 Cover glass 31 Case 31a Slope 32 Cover glass 33 Cover glass 34 Cover glass 35 Case 35a Slope 35b Slope 36 Cover glass 37 Cover glass 41 Cover glass 41 Cover glass 42 Cover glass 44 Cover glass 51 Case 52 Optical axis 53 Cover glass 55 Cover glass 56 Cover glass 61 Cover glass 62 Case 62a Projection 62b Projection

Claims (8)

[Claims] 1. A contact type image sensor comprising: a light emitting unit that irradiates a surface to be read at the time of reading; and a light receiving unit that receives light reflected by the surface to be read, wherein the light reflected from the surface to be read is provided. A contact type image sensor characterized in that a protruding portion protruding toward the surface to be read is provided in the vicinity of the incident position. 2. A transparent body having a surface abutting on a surface to be read at the time of reading; a case supporting the transparent body; a light emitting unit for irradiating the surface to be read through the transparent body; A light receiving unit that receives reflected light that has passed through the transparent body after being reflected, wherein the vicinity of the incident position of the reflected light from the surface to be read on the surface of the transparent body is a peripheral part thereof. A contact-type image sensor that protrudes more toward the surface to be read. 3. The close contact according to claim 2, wherein the transparent body has a substantially flat plate shape, a transparent band-shaped protrusion is provided on a part of the surface, and the incident position is set on the surface of the protrusion. Type image sensor. 4. The contact type image sensor according to claim 3, wherein at least a part of the surface of the projecting portion projects in a curved shape in a width direction, and the incident position is set at the projecting end. 5. The transparent body is band-shaped, the transparent body is attached to the case such that the surface protrudes from the surface of the case, and the incident position is set on the surface of the transparent body. Item 3. A contact image sensor according to Item 2. 6. The contact type image sensor according to claim 5, wherein at least a part of the surface of the transparent body in a width direction protrudes in a curved shape, and the incident position is set at a protruding end. 7. The transparent body is attached to an upper surface of the case, and the upper surface of the case has a shape such that at least one of both sides in the width direction of the transparent body moves away from the transparent body. The contact type image sensor according to claim 5, wherein the contact type image sensor is inclined so as to approach a lower surface. 8. The close-contact type according to claim 5, wherein a surface of the case is substantially rectangular in cross section, and the transparent body is arranged at one of four corners of the rectangle. Image sensor.