JP2000101781A - Contact type image sensor unit - Google Patents

Abstract

PROBLEM TO BE SOLVED: To mount a linear light source, a nonmagnification linear sensor, and an electric circuit on one circuit board in a narrow space and to prevent ghost light from being generated. SOLUTION: A luminous flux stop member 21 cuts off light which is reflected only once by a roof prism 9 to prevent ghost light from being emitted. Further, the linear light source 1 and nonmagnification linear sensor 2 are mounted on the common circuit board 23, the relative position between the both are accurately determined, and the number of circuit boards 23 is decreased. Further, the length of a vertical optical path perpendicular to a recording medium 5 is shortened by using a roof prism lens array 6 which reflects the light from the recording medium 5 almost at right angles and images it on the nonmagnification linear sensor 2 and the width of the circuit board 23 perpendicular to the recording medium 5 is also shortened by mounting the electronic circuit 11 on the opposite surface of the circuit board 23 from the nonmagnification linear sensor 2.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a copying machine,
The present invention relates to an image reading device mounted on a facsimile or the like, or a contact type image sensor unit used for an image reading device used alone.

[0002]

2. Description of the Related Art First, a conventional structure of a contact image sensor unit will be described. The contact type image sensor unit A shown in FIG. 10 uses an LED array 1 as a linear light source and a rod lens array 3 of a refractive index distribution type as an image forming element for forming an image on an equal-magnification linear sensor 2. The original 5 on the document 4 is illuminated by the LED array 1, and the reflected light from the original 5 is imaged on the linear sensor 2 by the rod lens array 3.

In this example, since the optical axis of the rod lens 3 is a straight line, the rod lens array 3 must be disposed between the original 5 and the linear sensor 2 at a right angle with respect to both. There is a problem in that the length in the optical axis direction is physically long, and the image reading device becomes large.

Therefore, as shown in FIG. 11, the original 5 on the contact glass 4 is illuminated by the LED array 1 and the reflected light from the original 5 is bent by the roof prism lens array 6 in the right angle direction while the linear sensor 2 having the same size. There is a contact-type image sensor unit B that forms an image on the surface.

[0005] The roof prism lens array 6 used here is an object-side lens array 7 on which reflected light from the vicinity of the reading line of the original 5 is incident, and a light beam mutually formed equivalently to the object-side lens array 7. An imaging-side lens array 8 whose axes are substantially orthogonal to each other, and a roof prism 9 that emits incident light from the object-side lens array 7 to the imaging-side lens array 8.

FIGS. 12 (a) and 12 (b) show other examples of the roof prism lens array 6. FIG. FIG. 12A is a perspective view seen from the direction of the roof prism 9, and FIG. 12B is a perspective view seen from the direction of the object-side lens array 8 with the light beam stop members 21 and 22 mounted. As shown in the figure, the object-side lens array 7 is formed by a large number of lenses 7a arranged in the reading line direction and receiving the reflected light y on one reading line, and the roof prism 9 is separated from the individual lenses 7a. Formed by arranging a number of roof surfaces 9a that reflect incident light y on two roof-shaped surfaces in the reading line direction,
The imaging-side lens array 8 is formed by arranging a large number of lenses 8a that emit the light reflected by each roof surface 9a toward the equal-magnification linear sensor 2 as emission light x in the reading line direction. The light beam stop members 21 and 22 function as apertures to make light beams passing through the lenses 7a and 8a of the object-side lens array 7 and the image-forming lens array 8 constant.

[0007] Such a roof prism lens array 6
In the contact-type image sensor unit B using the same, the circuit board 10 on which the 1 × linear sensor 2 is mounted is arranged in a direction orthogonal to the original 5, and the electronic device connected to the 1 × linear sensor 2 When the circuit 11 is mounted on the circuit board 10, the width L1 of the circuit board 10 increases as shown in FIG. As a result, the protrusion length L2 of the circuit board 10 protruding from the roof prism lens array 6 in the direction opposite to the document 5 becomes longer, and the overall height of the image reading device increases.

Further, since the circuit board 12 on which the LED array 1 is mounted is provided separately from the circuit board 10 on which the 1: 1 linear sensor 2 is mounted, not only the number of components increases, but also the LED array 1 and the While accurately maintaining the relative position with the 1 × linear sensor 2, the plurality of circuit boards 10,
12 must be assembled. As a result, there is a problem that component costs and assembly costs increase.

As another conventional example, a contact-type image sensor unit C shown in FIG. 14 is an LED that irradiates an original 5 with illumination light on one circuit board 10 via a condenser lens 13.
Since the array 1 and the 1: 1 linear sensor 2 are mounted, only one circuit board 10 is required, and the relative position between the LED array 1 and the 1: 1 linear sensor 2 can be easily determined. In addition, LED
Since the light-shielding plate 14 for shielding light between the array 1 and the linear sensor 2 is provided, light from the LED array 1 is prevented from directly entering the linear sensor 2. .

The roof prism lens array 6 for forming an image of the reflected light from the original 5 is basically the same as that shown in FIGS. 11 and 12, and the same parts will be described using the same reference numerals. The roof prism lens array 6 has a light shielding portion 15 formed around the lenses 7a and 8a.
However, since the light-shielding portion 15 has no thickness, the following problem occurs.

The problem will be described with reference to FIG. FIG. 15 is an explanatory diagram showing a light reflection state inside the roof prism lens array 6. In the state illustrated on the right side in FIG. 15, light incident from a certain lens 7a on the object side is reflected (twice reflected) by two roof-shaped roof surfaces 9a and emitted from the lens 8a on the image forming side. This is a normal imaging light. The state shown on the left side in FIG. 15 shows a state in which reflected light from a position distant on the reading line is incident from the lens 7a on the object side. In this case, the incident light is a roof-shaped roof. The light is reflected only on one of the surfaces 9a, and is emitted obliquely off the center of the lens 8a on the imaging side. This emitted light is a once-reflected ghost light.

[0012]

SUMMARY OF THE INVENTION The present invention has been made in view of the above points, and uses a roof prism lens array that can be manufactured at a lower cost than a rod lens. It is an object of the present invention to provide a contact type image sensor unit in which a linear sensor and an electronic circuit are mounted on a single circuit board in a small space, and furthermore, ghost light due to single reflection can be prevented. .

[0013]

According to the first aspect of the present invention,
An object-side lens array to which reflected light from the vicinity of a reading line of a recording medium illuminated by a linear light source is incident, and an imaging-side lens array formed equivalent to the object-side lens array and having optical axes substantially orthogonal to each other. A roof prism lens array integrally formed with a roof prism that emits incident light from the object-side lens array to the imaging-side lens array, and an image on the recording medium is formed by the roof prism lens array. In the close contact type image sensor unit that forms an image on a double linear sensor, an arrangement pitch of individual lenses of the object side lens array and the image forming side lens array is provided between the roof prism lens array and the unity linear sensor. A light beam diaphragm member having an aperture arranged at an arrangement pitch corresponding to the linear light source and the linear light source; A linear sensor is mounted on the same circuit board, an electronic circuit, wherein the linear light source and the magnification linear sensor is connected is mounted on the opposite side to the magnification linear sensor of the circuit board.

Therefore, the light reflected only once by the roof prism is blocked by the light beam stop member. Also,
Since the linear light source and the 1x linear sensor are mounted on a common circuit board, the relative positions of both are accurately determined,
It is possible to reduce the number of circuit boards. Further, by using a roof prism lens array that reflects the incident light from the object-side lens array in a direction substantially orthogonal to and emits the light from the imaging-side lens array, the optical path length in the direction perpendicular to the recording medium is reduced. In addition, since the electronic circuit is mounted on the surface of the circuit board on the side opposite to the 1: 1 linear sensor, the width of the circuit board in the direction perpendicular to the recording medium can be reduced. .

According to a second aspect of the present invention, there is provided an object-side lens array on which reflected light from the vicinity of a reading line of a recording medium illuminated by a linear light source is incident, and an object-side lens array formed equivalently to the object-side lens array. An image-forming side lens array having an optical axis substantially orthogonal to the optical axis, and a roof prism lens array integrally formed with a roof prism for emitting incident light from the object-side lens array to the image-forming side lens array; In a close contact type image sensor unit for forming an image of a medium on a 1: 1 linear sensor by the roof prism lens array, the object-side lens array and the imaging device are disposed between the roof prism lens array and the 1: 1 linear sensor. Beam stop unit having openings arranged with an arrangement pitch corresponding to the arrangement pitch of the individual lenses of the image-side lens array Is provided, on the emission side of the imaging-side lens array, a reflection surface that reflects light emitted from the imaging-side lens array in a direction perpendicular to the recording medium is provided. A circuit board arranged substantially in parallel is provided, and the circuit board is mounted with the linear light source and the 1: 1 linear sensor to which light reflected by the reflection surface is incident.

Therefore, the light reflected only once by the roof prism is blocked by the light beam stop member. Also,
Since the linear light source and the 1x linear sensor are mounted on a common circuit board, the relative positions of both are accurately determined,
It is possible to reduce the number of circuit boards. Further, by using a roof prism lens array that reflects the incident light from the object-side lens array in a direction substantially orthogonal to and emits the light from the imaging-side lens array, the optical path length in the direction perpendicular to the recording medium is reduced. Further, since the light emitted from the imaging-side lens array is reflected by the reflection surface in a direction perpendicular to the recording medium side, the circuit board on which the 1 × linear sensor is mounted is substantially referred to as the recording medium. It is possible to arrange the circuit boards in parallel, so that the space for arranging the circuit boards in the direction perpendicular to the recording medium is significantly shortened, and the thinning is promoted.

According to a third aspect of the present invention, in the second aspect of the invention, the linear light sources are arranged in two rows on the circuit board with the object-side lens array interposed therebetween.

Therefore, it is possible to illuminate the image on the recording medium from two directions and to increase the illumination intensity.

According to a fourth aspect of the present invention, in the third aspect of the present invention, the circuit board is provided with an opening for limiting a light flux of light incident on each lens of the object-side lens array. .

Accordingly, the circuit board can be provided with an aperture function for preventing extra light from being incident on the object-side lens array.

[0021]

FIG. 1 shows a first embodiment of the present invention.
A description will be given based on FIG. In this embodiment and the other embodiments following this, the portions described based on FIGS. 10 to 15 are denoted by the same reference numerals, and description thereof is omitted.
This embodiment corresponds to the first aspect of the present invention.

The close contact type image sensor unit D in this embodiment is constructed by assembling a roof prism lens array 6, light beam stop members 21, 22 and a circuit board 23 in a housing 20. The roof prism lens array 6 is basically the same as that described with reference to FIGS. 11 to 14, and includes an object-side lens array 7 to which reflected light from near the reading line of the original 5 is incident, and an object-side lens array An imaging lens array 8 which is formed equivalently to the optical lens 7 and whose optical axes are substantially orthogonal to each other, and a roof prism 9 which emits incident light from the object lens array 7 to the imaging lens array 8 are integrally formed by plastic molding. It was done.

The circuit board 23 is attached to the housing 20 while being maintained perpendicular to the original 5 as a recording medium, and a surface of the circuit board 23 facing the image forming lens array 8 is a linear light source. The LED array 1 and the 1 × linear sensor 2 are mounted, and an electronic circuit 11 to which the LED array 1 and the 1 × linear sensor 2 are connected is mounted on the opposite surface.

The beam stop member 21 includes the imaging side lens array 8 of the roof prism lens array 6 and the same-magnification linear sensor 2.
The light beam stop member 22 is disposed between the object side lens array 7 of the roof prism lens array 6 and the contact glass 4, and these light beam stop members 21 and
An opening 24 is formed in the array 22 at an arrangement pitch corresponding to the arrangement pitch of the lenses 7a and 8a (see FIG. 12).

In this configuration, the vicinity of the reading line of the document 5 placed on the contact glass 4 is illuminated by the LED array 1, and the reflected light from the document 5 enters from the object-side lens array 7 of the roof prism lens array 6. Is done. The incident light is reflected twice by the roof prism 9, exits from the imaging-side lens array 8, and is imaged on the 1 × linear sensor 2.

At this time, the roof prism lens array 6
FIG. 2 shows the state of reflection of light in the inside of FIG. In the state shown on the right side in FIG. 2, the light incident from a certain lens 7a on the object side is reflected by two roof-shaped roof surfaces 9a (2).
This is a state in which the light is reflected twice and emitted from the lens 8a on the image forming side, and is normal image forming light. The state shown on the left side in FIG. 2 shows a state in which reflected light from a position distant on the reading line is incident from the lens 7a on the object side. In this case, the incident light is a roof-shaped roof. The light is reflected only on one surface of the surface 9a, and is reflected in an oblique direction outside the center of the lens 8a on the image forming side. No light is emitted from the lens 8a.

Further, since the LED array 1 and the same-size linear sensor 2 are mounted on a common circuit board 23, the relative positions of the two can be accurately determined, and the number of circuit boards 23 can be reduced.

Further, by using the roof prism lens array 6 for reflecting the incident light from the object-side lens array 7 in a direction substantially orthogonal to emitting the light from the imaging-side lens array 8, a direction perpendicular to the original 5 can be obtained. Can be shortened. Further, since the electronic circuit 11 is mounted on the surface of the circuit board 23 opposite to the one-size linear sensor 2, the width of the circuit board 23 in the direction perpendicular to the document 5 can be reduced. This is clear when the dimension L2 in FIG. 13 is compared with the dimension L3 in FIG.

The circuit board 23 does not need to be exactly perpendicular to the document 5. By inclining the surface on which the LED array 1 is mounted so as to face slightly upward, the illumination intensity of the document 5 can be increased.

Here, modified examples of the present embodiment are shown in FIGS. These modifications are examples in which the illumination intensity of the original 5 is further increased even when the LED array 1 having low directivity is used as the linear light source. FIG.
The example shown in FIG.
This is an example in which a reflection surface 25 that reflects light from the D array 1 toward the original 5 is formed. The example illustrated in FIG. 4 is an example in which a light guide path 26 that guides light from the LED array 1 toward the document 5 is formed on the upper part of the housing 20 facing the document 5. In addition, the light guide path 2
It is desirable that a reflection surface 27 be formed on the inner surface of 6. In the example shown in FIG. 5, an L
This is an example in which a light guide 28 that guides light from the ED array 1 toward the document 5 is provided.

The reflection surfaces 25, 2 shown in FIGS.
7 is formed by evaporating a metal having a high reflectance such as Al or Ag, but may be formed by mirror-finishing the surface of the housing 20 or by disposing another reflective member. Good.

Next, a second embodiment of the present invention will be described with reference to FIG. This embodiment corresponds to the invention described in claim 2. The close contact type image sensor unit E in the present embodiment includes a housing 29 including the same roof prism lens array 6 and light beam stop members 21 and 22 as in the previous embodiment. In addition, the housing 29 reflects the light emitted from the imaging-side lens array 8 in a direction (upward) perpendicular to the document 5 on the emission side of the imaging-side lens array 8 of the roof prism lens array 6. Reflective surface 30 is provided. A circuit board 31 is provided substantially parallel to the document 5 so as to face the same. The LED array 1 and the electronic circuit 11 are mounted on one surface of the circuit board 31 facing the document 5 and the other side. A 1: 1 linear sensor 2 on which light reflected by the reflection surface 30 is incident is mounted on the surface. Reflective surface 3
0 is formed by vapor-depositing a metal having a high reflectance such as Al or Ag, but may be formed by mirror-finishing the surface of the housing 20 or disposing another reflective member. Good.

In the configuration according to the present embodiment, FIG.
As described with reference to, the light reflected only once by the roof prism 9 is blocked by the light beam stop member 21. In addition, since the LED array 1 and the 1: 1 linear sensor 2 are mounted on the common circuit board 31, the relative positions of the two can be accurately determined, and the number of circuit boards 31 can be reduced. Further, by using the roof prism lens array 6 that reflects the incident light from the object-side lens array 7 in a direction substantially perpendicular to the light and emits the light from the imaging-side lens array 8, the optical path length in the direction perpendicular to the original 5 is used. Can be shortened.

In this embodiment, since the light emitted from the image forming side lens array 8 is reflected by the reflecting surface 30 in the direction perpendicular to the original 5, the circuit board on which the 1 × linear sensor 2 is mounted The reference numeral 31 can be disposed substantially parallel to the document 5 so as to face the original. Accordingly, the arrangement space of the circuit board 31 in the direction perpendicular to the document 5 is significantly reduced,
Thinning can be promoted.

Due to this reduction in thickness, a margin is provided between the contact type image sensor unit E and the contact glass 4,
When a flatbed type scanner is manufactured, there is an advantage that the degree of freedom in design is increased.

Next, a third embodiment of the present invention will be described with reference to FIG. This embodiment corresponds to the second aspect of the present invention. In this example, the contact type image sensor unit F also outputs light emitted from the roof prism lens array 6 in a direction (downward) perpendicular to the document 5. A reflecting surface 30 for reflecting light is provided. The difference from the above-described embodiment is that a casing 32 having a different shape in order to dispose the reflecting surface 30 downward.
Is used. In this case 32, since the light emitted from the imaging side lens array 8 of the roof prism lens array 6 is reflected downward by the reflection surface 30, the 1 × linear sensor 2 is supported below the case 32. It is mounted on the upper surface of the circuit board 33. The LED array 1 and the electronic circuit 11 are also mounted on the upper surface of the circuit board 33. For this reason, the housing 32 is provided with a light guide 28 that guides light from the LED array 1 to the document 5.

In such a configuration, the LED array 1
Is guided to the original 5 by the light guide 28 to illuminate the original 5. The reflected light from the original 5 is reflected on the object side lens array 7.
Is emitted from the imaging-side lens array 8, and the emitted light is imaged on the lower unity linear sensor 2 by the reflection surface 30.

Also in this embodiment, since the light emitted from the imaging side lens array 8 is reflected by the reflection surface 30 in a direction perpendicular to the original 5, the circuit board on which the 1 × linear sensor 2 is mounted 33 can be arranged substantially parallel to the document 5. Accordingly, the arrangement space of the circuit board 33 in the direction perpendicular to the document 5 can be significantly reduced, and the thickness can be reduced.

Next, a fourth embodiment of the present invention will be described with reference to FIG. This embodiment corresponds to the third aspect of the present invention. The contact type image sensor unit G in the present embodiment includes a plurality of LED arrays 1 arranged in two rows with the object side lens array 7 interposed therebetween. That is, the housing 34 is formed in a shape that supports the circuit board 35 so as to cover the upper surface of the object-side lens array 7.
An opening 36 is formed to face (see FIG. 12), and the two rows of LED arrays 1 are arranged on both sides of the opening 36 and mounted on the circuit board 35. Therefore, the image of the original 5 can be illuminated from two directions, and the illumination intensity can be increased. Since the reading line of the original 5 is illuminated from both sides, for example, the original 5 on which the paper on which the image is formed is attached
Even when the image is read, it is possible to prevent the thickness of the attached paper from appearing as a shadow.

Next, a fifth embodiment of the present invention will be described with reference to FIG. This embodiment corresponds to the invention described in claim 4. The contact type image sensor unit H according to the present embodiment includes a light beam diaphragm member 2 on the original 5 side shown in FIG.
2 is omitted, and instead of the thin circuit board 35, the thick circuit board 3
7, an opening 38 is formed on the circuit board 37 for limiting the luminous flux of light incident on each lens 7a (see FIG. 12) of the object-side lens array 7.

Accordingly, an aperture function for preventing extra light from entering the object-side lens array 7 can be imparted to the circuit board 37, and the thickness can be further reduced.

In the embodiments shown in FIGS. 6, 8 and 9, as described with reference to FIGS.
In order to guide the light of the LED array 1 to the document 5, a reflecting surface, a light guide path, and a light guide may be provided.

[0043]

According to the first aspect of the present invention, an object-side lens array on which reflected light from a recording medium is incident, a roof prism that reflects the incident light in a direction substantially orthogonal to the object, and a roof prism that reflects the incident light. A roof prism lens array integrally formed with an imaging side lens array that emits the reflected light, and a light beam stop member is provided between the roof prism lens array and the 1 × linear sensor. A 1x linear sensor is mounted on the same circuit board,
Since the electronic circuit is mounted on the surface of the circuit board on the side opposite to the 1: 1 linear sensor, light that is reflected only once by the roof prism is blocked by a light beam stop member to prevent ghost light from being emitted. be able to. In addition, since the linear light source and the 1 × linear sensor are mounted on a common circuit board, the relative positions of the two can be accurately determined, and the number of circuit boards can be reduced. Further, by using a roof prism lens array that reflects the incident light from the object-side lens array in a direction substantially orthogonal to and emits the light from the imaging-side lens array, the optical path length in the direction perpendicular to the recording medium is reduced. Further, since the electronic circuit is mounted on the surface of the circuit board opposite to the one-to-one linear sensor, the width of the circuit board in the direction perpendicular to the recording medium can be reduced.

According to a second aspect of the present invention, there is provided an object-side lens array on which reflected light from a recording medium is incident, a roof prism for reflecting the incident light in a direction substantially orthogonal to the light, and light reflected by the roof prism. A roof prism lens array integrally formed with an imaging side lens array that emits light, and a light beam stop member is provided between the roof prism lens array and the 1 × linear sensor. On the emission side, there is provided a reflection surface for reflecting the light emitted from the imaging side lens array in a direction perpendicular to the recording medium, and a circuit board arranged substantially parallel to the recording medium is provided. Since a linear light source and the same-magnification linear sensor to which the light reflected by the reflecting surface is incident are mounted on the circuit board, the light reflected only once by the roof prism is emitted by the light beam. Ri is shielded by member, it is possible to prevent the ghost light is emitted. In addition, since the linear light source and the 1 × linear sensor are mounted on a common circuit board, the relative positions of the two can be accurately determined, and the number of circuit boards can be reduced. Further, by using a roof prism lens array that reflects the incident light from the object-side lens array in a direction substantially orthogonal to and emits the light from the imaging-side lens array, the optical path length in the direction perpendicular to the recording medium is reduced. Further, since the light emitted from the imaging-side lens array is reflected by the reflecting surface in a direction perpendicular to the recording medium side, the circuit board on which the 1 × linear sensor is mounted is substantially parallel to the recording medium. Can be arranged. Therefore, the arrangement space of the circuit board in the direction perpendicular to the recording medium can be significantly reduced, and the thickness can be reduced.

According to a third aspect of the present invention, in the second aspect of the present invention, since the linear light sources are arranged in two rows on the circuit board with an object-side lens array therebetween, an image on a recording medium can be reproduced. Illumination can be performed from two directions to increase the illumination intensity. Accordingly, even when reading the original image on which the paper on which the image is formed is pasted, it is possible to avoid a state in which the thickness of the pasted paper appears as a shadow.

According to a fourth aspect of the present invention, in the third aspect of the present invention, the circuit board is provided with an opening for limiting the light flux of light incident on each lens of the object-side lens array. An aperture function for preventing extra light from being incident on the object-side lens array can be provided to the circuit board, which can further reduce the thickness.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional front view showing a first embodiment of the present invention.

FIG. 2 is an explanatory diagram showing a light reflection state inside a roof prism lens array.

FIG. 3 is a longitudinal sectional front view showing a modification.

FIG. 4 is a longitudinal sectional front view showing a modification.

FIG. 5 is a vertical sectional front view showing a modification.

FIG. 6 is a longitudinal sectional front view showing a second embodiment of the present invention.

FIG. 7 is a longitudinal sectional front view showing a third embodiment of the present invention.

FIG. 8 is a longitudinal sectional front view showing a fourth embodiment of the present invention.

FIG. 9 is a longitudinal sectional front view showing a fifth embodiment of the present invention.

FIG. 10 is a longitudinal sectional front view showing a first conventional example.

FIG. 11 is a longitudinal sectional front view showing a second conventional example.

FIG. 12 is a perspective view of a roof prism lens array.

FIG. 13 is a vertical sectional front view showing a relationship between a roof prism lens array and a circuit board.

FIG. 14 is a vertical sectional front view showing a third conventional example.

FIG. 15 is an explanatory diagram showing a reflection state of light inside the roof prism lens array.

DESCRIPTION OF SYMBOLS 1 Linear light source 6 Roof prism lens array 7 Object side lens array 8 Imaging side lens array 7a, 8a lens 9 Roof prism 21, 22, Light beam stop member 23 Circuit board 24 Opening 30 Reflecting surface 31, 33 , 35, 37 Circuit board 38 Opening

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Akira Sakurai 1-3-6 Nakamagome, Ota-ku, Tokyo Inside Ricoh Company (72) Inventor Ikuo Maeda 1-3-6 Nakamagome, Ota-ku, Tokyo Share F term in Ricoh Company (reference) 5C051 AA01 BA04 DB01 DB04 DB21 DB22 DB29 DC02 DC03 DC04 DC05 DC07 EA00 FA01

Claims (4)

[Claims] 1. An object-side lens array to which reflected light from the vicinity of a reading line of a recording medium illuminated by a linear light source is incident, and optical axes formed substantially equivalent to the object-side lens array are substantially orthogonal to each other. An image forming side lens array, and a roof prism lens array integrally formed with a roof prism for emitting incident light from the object side lens array to the image forming side lens array. In a close contact type image sensor unit that forms an image on a 1 × linear sensor by a prism lens array, the object side lens array and the imaging lens array are individually provided between the roof prism lens array and the 1 × linear sensor. A light beam diaphragm member having openings arranged at an arrangement pitch corresponding to the arrangement pitch of the lenses of The light source and the 1 × linear sensor are mounted on the same circuit board, and the electronic circuit to which the linear light source and the 1 × linear sensor are connected is provided on a surface of the circuit board opposite to the 1 × linear sensor. A contact-type image sensor unit that is mounted. 2. An object-side lens array on which reflected light from the vicinity of a reading line of a recording medium illuminated by a linear light source is incident, and optical axes formed substantially equivalent to the object-side lens array and substantially orthogonal to each other. An image forming side lens array, and a roof prism lens array integrally formed with a roof prism for emitting incident light from the object side lens array to the image forming side lens array. In a close contact type image sensor unit that forms an image on a 1 × linear sensor by a prism lens array, the object side lens array and the imaging lens array are individually provided between the roof prism lens array and the 1 × linear sensor. A light beam diaphragm member having openings arranged at an arrangement pitch corresponding to the arrangement pitch of the lenses of A reflection surface is provided on the exit side of the side lens array to reflect light emitted from the imaging side lens array in a direction perpendicular to the recording medium, and a circuit is disposed substantially parallel to the recording medium. A contact type image sensor unit, wherein a substrate is provided, and the linear light source and the 1: 1 linear sensor to which light reflected by the reflection surface is incident are mounted on the circuit board. 3. The contact-type image sensor unit according to claim 2, wherein the linear light sources are arranged in two rows on the circuit board with the object-side lens array therebetween. 4. The contact-type image sensor unit according to claim 3, wherein the circuit board has an opening for restricting a light flux of light incident on each lens of the object-side lens array.