JPH07261003A - Lens array - Google Patents

Abstract

(57) [Summary] [Purpose] Easy to manufacture, does not require high assembly accuracy,
It is an object to provide an inexpensive lens array. A flat reflecting mirror and a hemispherical or aspherical reflecting mirror are integrally formed with the transparent plate member 11 by a reflecting film 13 on the surface of the transparent plate member 11, and the inside of the transparent plate member 11 is used as an optical path. With a structure that combines the formation positions of the reflectors,
The transparent plate member 11 and the substrate 17 are fixed to a casing 18 together with the substrate 17 on which the illumination light source 16 and the light receiving element 15 are mounted so as to maintain a predetermined optical positional relationship.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a lens array used as an image forming element for an image sensor.

[0002]

2. Description of the Related Art Conventionally, this type of lens array has been used as an image forming element for an image sensor of an electronic device such as a facsimile, a copying machine, and an image scanner. In this case, there are a structure in which two lens arrays are combined and a structure in which a lens array and a mirror are combined. Hereinafter, a conventional image forming optical system will be described with reference to FIGS.

FIG. 14 is a principle diagram of an image forming optical system having a structure in which two conventional lenses are combined. In the figure, 10
1 is a document, 102 and 104 are lenses, and 103 is a lens 1.
Focuses 02 and 104, and 105 are sensors. At this time, the light of the image of the original 101 passes through the lens 102 and becomes the focal point 1.
Image on the sensor 03 through the lens 104.
The image is formed on the five surfaces in an erecting equal size.

FIG. 15 is a structural diagram in which FIG. 14 is formed into an array. In the figure, reference numerals 106 and 107 denote lens arrays (hereinafter abbreviated as LA), and the lens 10 in FIG.
Lenses 2 and 104 having the same optical characteristics are arranged as a minimum optical unit in a line at regular intervals, and are integrally formed in a long length necessary for reading a document. The light of the image of the original 101 is formed on the surface of the sensor 105 at an equal magnification as in the case of FIG.

FIG. 16 is a principle diagram of a conventional imaging optical system having a structure in which a lens and a mirror are combined. In the figure, reference numeral 108 denotes a roof mirror, the cross section of which has a right-angled isosceles triangle, and two orthogonal surfaces 108a and 108b are mirror-finished. If the optical center line of the lens 102 and the right bisector of the roof mirror 108 are arranged so as to coincide with each other, the light of the image of the original 101 is reflected by the lens 102.
After passing through the roof mirror 108, the lens 10 is reflected again
An image is formed on the surface of the original 101 through the image 2 at an equal magnification.

FIG. 17 is a structural diagram in which the pair of lenses and the roof mirror shown in FIG. 16 are arrayed. In the figure, 109 is LA, 110 is two orthogonal surfaces 110a and 110.
Reference numeral b denotes a mirror-finished roof mirror array (hereinafter abbreviated as RMA), in which the lens 102 and the roof mirror 108 in FIG. 16 are arranged in a row at a constant interval as a minimum optical unit, and have a length required for reading an original. It is formed as a long piece. The light of the image of the original 101 forms an erecting equal-magnification image on the surface of the original 101 in the same manner as in FIG.

FIG. 18 is a structural diagram of a conventional LA and RMA imaging optical system. In the figure, 111 is an optical path separation mirror, which reflects the light of the image of the original 101 to the LA 109 and the light emitted from the LA 109 to the sensor side.

[0008]

In the conventional image-forming optical system of erecting equal-magnification with two lenses, the optical path length must be lengthened, and it is difficult to reduce the size. And a high positional accuracy with respect to the LA is required, resulting in an increase in cost.

Further, in the image forming optical system based on RMA, LA
, RMA, and optical path separation mirror are required, and each of them must be formed with high accuracy, and high assembly accuracy is required for the positional relationship between the document, the sensor, and the three units. Then, the cost increased.

The present invention has been made to solve the above problems, and an object thereof is to provide an inexpensive lens array which is easy to manufacture, does not require high assembly precision.

[0011]

In order to achieve the above object, the present invention provides a transparent plate member with a flat reflecting mirror and a spherical or aspherical reflecting mirror formed integrally with the transparent plate member. The inside of the plate member serves as an optical path, and the formation positions of the respective reflecting mirrors are combined so that the transparent plate member and the substrate are maintained in a predetermined optical positional relationship together with the substrate on which the illumination light source and the light receiving element are mounted. It is fixed to the case.

[0012]

With the above construction, since all the optical elements conventionally required are integrally formed on the transparent plate member, it is possible to provide an image forming element with high accuracy of parts and low cost of parts, and further, Since there is no need for adjustment and the optical path can be folded by the reflecting mirror, a small lens array can be obtained.

[0013]

【Example】

(Embodiment 1) Hereinafter, a first embodiment of the present invention will be described. FIG. 1 is a perspective view of an LA according to the first embodiment of the present invention. FIG. 2 is a cross-sectional view of the LA in the first embodiment of the present invention taken along the line AA shown in FIG.

In each of the drawings, reference numeral 11 denotes a transparent plate member, which is made of, for example, acrylic resin and is formed by an injection molding method. The transparent plate member 11 has a thickness of 1 to 5 mm based on the optical path length and the number of reflections, and the longitudinal direction (the direction of the arrow in the figure) is 230 mm (A4) or 260 mm (B) depending on the size of the original.
4) About 5 to 30 mm in the lateral direction (arrow direction in the figure). Further, the LA surface 11a and the document surface 11b are formed with high accuracy in the flatness of each surface and the parallelism between both surfaces, and the lens convex portion 11c is formed on the LA surface 11a.
Are integrally formed in an array in one row in the longitudinal direction.

The radius of curvature and the position of the convex portion 11c of the lens are such that the original image at the original reading position 20 is reduced and formed on the light receiving element 15 when the reflecting film 13 is formed later and the hemispherical reflecting mirror 12 is formed. Is set to. The reduction ratio is the optical path length S1 from the document reading position 20 to the hemispherical reflecting mirror 12.
And the optical path length S2 from the hemispherical reflecting mirror 12 to the light receiving element 15
And the ratio β = S2 / S1. In the first embodiment shown in FIG. 2, β = 2/3.

Reference numeral 13 is a reflection film, which is formed by vapor-depositing aluminum, for example, on a part of the LA surface 11a and the original surface 11b and the lens convex portion 11c. In this way, the hemispherical reflecting mirror 12 is formed by the lens convex portion 11c and the reflecting film 13.

Reference numeral 14 denotes a hard coat film, which is the original surface 1
Hard glass, for example, is formed on the reflection film 13 of 1b by a sputtering method. The hard coat film 14 protects the reflective film 13 and the transparent plate member 11 from abrasion due to friction with the original 19.

Reference numeral 15 is a light receiving element for reading the formed original image and converting it into an electric signal, 16 is a light source for illuminating the original reading position 20, and 17 is a light receiving element 15 and an illuminating light source 16 in the longitudinal direction. It is a board mounted in a row.

The transparent plate member 11 and the substrate 17 are held in the casing 18 in such a positional relationship that the original image at the original reading position 20 is formed on the light receiving element 15.

L in the present invention configured as described above
When the contact type image sensor using A is brought into close contact with the original, the original image is irradiated by the illumination light source 16, and the reflected light from the original incident on the original reading position 20 is reflected by the reflection film 13 and is reflected by the hemispherical surface. The light is focused by the mirror 12, reflected again by the reflecting film 13, and is inverted and reduced and imaged on the light receiving element 15 at a reduction ratio of 2/3.

Although the LA surface 11a and the original surface 11b are parallel to each other in this embodiment, they need not be parallel if the original reading position 20 and the light receiving element 15 are accurately connected by an optical path to form an image. The reflective film 13 is not limited to three surfaces as long as it does not interfere with the signal processing of the light-receiving element 15 even in the case of inverted equal-magnification imaging. Further, the hemispherical reflecting mirror 12 is not necessary for reducing aberrations and changing the viewing angle. Making a sphere is an easy application according to the present invention and need not be explained again.

As described above, since the optical element necessary for reading the original is integrally formed on the transparent plate member 11, the cost of the parts becomes low, the assembly and the alignment of the optical parts are not necessary, and the assembling cost is also reduced. It became cheaper, and it became possible to make it smaller by folding the optical path.

(Embodiment 2) Next, a second embodiment of the present invention will be described. FIG. 3 is a perspective view of LA in the second embodiment of the present invention. FIG. 4 is a cross-sectional view of the LA in the second embodiment of the present invention taken along the line BB shown in FIG.

In FIGS. 3 and 4, reference numeral 21 denotes a transparent plate member, which is made of the same material as the transparent plate member 11 of the first embodiment and has the same size and the same processing accuracy and shape. Further, lens convex portions 21c are integrally formed on the LA surface 21a in an array in parallel with two columns in the longitudinal direction.

The radius of curvature and the position of the convex portion 21c of the lens are set so that the original image at the original reading position 30 is formed at the same size on the light receiving element 25 when the reflecting film 23 is formed later and the hemispherical reflecting mirror 22 is formed. Is set to.

A reflecting film 23 is formed by vapor-depositing aluminum, for example, on a part of the LA surface 21a and the original surface 21b and the lens convex portion 21c. In this way, the hemispherical reflecting mirror 22 is formed by the lens convex portion 21c and the reflecting film 23.

Reference numeral 24 denotes a hard coat film, which is the original surface 2
Hard glass, for example, is formed on the reflection film 23 of 1b by a sputtering method. The hard coat film 24 protects the reflective film 23 and the transparent plate member 21 from abrasion due to friction with the original 29.

Reference numeral 25 is a light receiving element for reading the formed original image image and converting it into an electric signal, 26 is an illuminating light source for illuminating the original reading position 30, and 27 is a light receiving element 25 and an illuminating light source 26 in the longitudinal direction. It is a board mounted in a row.

The transparent plate member 21 and the substrate 27 are held in the case 28 in such a positional relationship that the original image at the original reading position 30 is imaged on the light receiving element 25.

L in the present invention configured as described above
When the contact-type image sensor using A is brought into close contact with a document, the document image is illuminated by the illumination light source 26, and the reflected light of the document surface 21b incident on the document reading position 30 is
The light is reflected by the reflection film 23, the collection of light by the hemispherical reflecting mirror 22 and the reflection by the reflection film 23 are repeated twice, and an erecting equal-magnification image is formed on the light receiving element 25.

Although the LA surface 21a and the original surface 21b are parallel to each other in the second embodiment, they need not be parallel if the original reading position 30 and the light receiving element 25 are accurately connected by an optical path to form an image. However, the reflection film 23 is not limited to three surfaces as long as it does not interfere with the signal processing of the light receiving element 25 even in erecting equal-magnification imaging, and the hemispherical reflecting mirror 22 reduces aberrations and changes the viewing angle. Making an aspherical surface is an easy application according to the present invention and need not be explained again.

As described above, since the optical element necessary for reading the original is integrally formed on the transparent plate member 21, the cost of the parts is reduced, and the assembly and the alignment of the optical parts are not necessary, and the assembly cost is also increased. It became cheaper, and it became possible to make it smaller by folding the optical path.

(Embodiment 3) Next, a third embodiment of the present invention will be described. FIG. 5 is a perspective view of an LA according to the third embodiment of the present invention. 6 is a sectional view taken along line CC of FIG. 5 showing LA in the third embodiment of the present invention, and FIG. 7 is a sectional view taken along line CC of FIG. 5 of LA in the third embodiment of the present invention.
It is a D line sectional view.

In FIGS. 5 to 7, reference numeral 31 denotes a transparent plate member, which is formed of the same material as the transparent plate member 11 of the first embodiment with the same size and processing accuracy with the same shape. Further, lens convex portions 31c are integrally formed on the LA surface 31a in an array in parallel with two columns in the longitudinal direction.

The radius of curvature and the position of the convex portion 31c of the lens are such that the original image at the original reading position 40 is formed at the same size on the light receiving element 35 when the reflecting film 33 is formed later and the hemispherical reflecting mirror 32 is formed. Is set to.

On the original surface 31b, the stepped convex portion 3 shown in FIG.
1d is formed. The stepped convex portion 31d is the original surface 31
The b-side vertical angle is a right angle, and the same number and the same number of lens convex portions 31c and stepped convex portions 31d are integrally formed so that the vertical bisector of the vertical angle coincides with the optical axis of the lens convex portion 31c. ing.

Reference numeral 33 is a reflection film, which is formed by vapor-depositing aluminum, for example, on a part of the LA surface 31a and the original surface 31b, and on the lens convex portion 31c and the stepped convex portion 31d. In this way, the hemispherical reflecting mirror 32 is formed by the lens convex portion 31c and the reflecting film 33, and the roof mirror array (hereinafter abbreviated as RMA) 41 is stepped convex portion 31.
It is formed by d and the reflection film 33.

Reference numeral 34 denotes a hard coat film, which is the original surface 3
Hard glass, for example, is formed on the reflection film 33 of 1b by a sputtering method. The hard coat film 34 protects the reflective film 33 and the transparent plate member 31 from abrasion due to friction with the original 39.

Reference numeral 35 is a light receiving element for reading the formed original image and converting it into an electric signal, 36 is an illuminating light source for illuminating the original reading position 40, and 37 is the light receiving element 35 and the illuminating light source 36 in the longitudinal direction. It is a board mounted in a row.

The transparent plate member 31 and the substrate 37 are held in the case 38 in such a positional relationship that the original image at the original reading position 40 is formed on the light receiving element 35.

L in the present invention configured as described above
When the contact-type image sensor using A is brought into close contact with the original, the original image is irradiated by the illumination light source 36, and the reflected light of the original surface 31b incident on the original reading position 40 is
The light is reflected by the reflection film 33, and the collection of light from the hemispherical reflecting mirror 32 and the reflection of the reflection film 33 and the RMA 41 are repeated to form an erecting equal-magnification image on the light receiving element 35.

Although the LA surface 31a and the document surface 31d are parallel to each other in the third embodiment, they need not be parallel if the document reading position 40 and the light receiving element 35 are accurately connected by an optical path to form an image. In addition, it is a simple application according to the present invention that the hemispherical reflecting mirror 32 is made an aspherical surface in order to reduce the aberration and change the viewing angle, and need not be explained again.

Since the necessary optical elements are integrally formed on the transparent plate member 31 as described above, the cost of the parts is low, the assembly and the alignment of the optical parts are not required, and the assembly cost is low, and the optical path is reduced. It became possible to miniaturize by folding.

(Embodiment 4) When reading a long original using LA, shielding is required to avoid crosstalk with an adjacent optical system. FIG. 8 (a) is a perspective view showing the shielding structure by the mirror surface V groove of LA in the fourth embodiment of the present invention, and FIG. 8 (b) is the shielding by the ground glass V groove of LA in the fourth embodiment of the present invention. 8 is a perspective view showing the structure, and FIG.
FIG. 8C is an LA diagram of the fourth embodiment of the present invention.
It is the EE sectional view taken on the line of the mirror surface V groove | channel described in (a). The shielding structure will be described below.

In FIGS. 8A, 8B and 8C, 5
Reference numeral 1 denotes a transparent plate member, which is made of the same material as the transparent plate member 11 described in the first embodiment and has the same size and the same processing accuracy and the same shape. It should be noted that the difference is that in FIG. 8A, the shielding groove slope 52, between the adjacent lens convex portions 51c,
That is, 53 is formed. In FIG. 8C, the shielding groove slopes 52 and 53 are V-shaped grooves having an acute angle and are formed so that the light incident on and reflected by the lens convex portion 51c is separated into the respective lens convex portions 51c. There is. The slopes 52, 53 of the shielding groove are coated at the same time when the reflective film 56 is formed. As shown in FIG. 8C, due to the acute-angled V-shaped groove formed between the lens convex portions 51c, light does not leak to the adjacent optical system, and crosstalk is avoided when reading a long original. You can

FIG. 8B shows the slopes 54, 55 of the shield groove.
Is roughly formed into a ground glass. The shape of the slopes 54, 55 of the shielding groove is the same as the angle, depth, and shape shown in FIG. 8C, and the difference from FIG. 8A is that the reflective film 56 is processed into a roughly frosted glass shape. It is a point. By making the slopes 54, 55 of the shield groove roughly like frosted glass,
Even if strong light is incident, it can be prevented from becoming stray light and affecting the image formation.

FIG. 9A is a perspective view showing the shielding structure of the LA reflecting film in the fourth embodiment of the present invention.
FIG. 9B is a diagram of LA in the fourth embodiment of the present invention.
It is the FF sectional view taken on the line in (a).

In FIGS. 9A and 9B, reference numeral 51 denotes a transparent plate member, which is made of the same material as the transparent plate member 11 described in the first embodiment and has the same size and the same processing accuracy and shape. Has been done. The difference is that the adjacent lens convex portions 51 are
The point is that the reflective film is not formed between c. That is, when the reflective film is formed on the transparent plate member 51, masking is applied between the adjacent lens convex portions 51c. With the above structure, only the light incident on the lens convex portion 51c is reflected on the original surface 51b, and the light incident on the adjacent portion of the lens convex portion 51c passes through the LA surface 51a, so that the light does not leak to the adjacent optical system. The same effect as when the shielding groove is formed can be obtained.

(Embodiment 5) FIG. 10 is a perspective view of an LA transparent plate member in a fifth embodiment of the present invention. FIG. 11 is a sectional view taken along line GG of the transparent plate member shown in FIG. 10 of LA in the fifth embodiment of the present invention. 10 and 11, the transparent plate member 61 is processed into a shape that can be more easily used as an image sensor for reading a document.

In FIGS. 10 and 11, reference numeral 61 denotes a transparent plate member, which is made of the same material as the transparent plate member 11 of the first embodiment and is formed in the same shape with the same size and processing accuracy. Further, lens convex portions 61c are integrally formed on the LA surface 61a in an array in parallel with two columns in the longitudinal direction.

The radius of curvature and the position of the lens convex portion 61c are set so that the original image at the original reading position 70 is formed on the light receiving element 65 at the same size when the reflecting film 63 is formed later and the hemispherical reflecting mirror 62 is formed. Is set to.

A cylindrical lens portion 61e is formed at a position where the light from the illumination light source 66 is incident on the LA surface 61a, and the illumination light can be efficiently condensed on the original 69. Further, a step portion 61d is formed on the original surface 61b in parallel with the original surface 61b, the parallel flat surface portion constitutes the original reading position 70, and the inclined surface portion thereof reflects light from the original 69 on the transparent plate member 61. It becomes the incident surface 71 for incidence. The angle of inclination of the incident surface 71 is formed so as to be perpendicular to the optical path that travels while reflecting in the transparent plate member 61. Similarly, an inclined emission surface 72 is provided at the position where the optical path is emitted from the transparent plate member 61, and the inclination angle is formed to be perpendicular to the emitted optical path.

Reference numeral 63 denotes a reflecting film, which is a part of the LA surface 61a and the original surface 61b, the lens convex portion 61c and the shielding groove 73.
For example, aluminum is formed by vapor deposition. In this way, the hemispherical reflecting mirror 62 has the lens convex portion 61c and the reflecting film 6
It is formed by 3 and.

Reference numeral 64 denotes a hard coat film, which is the original surface 6
Hard glass, for example, is formed on the reflection film 63 of 1b by a sputtering method. The hard coat film 64 protects the reflective film 63 and the transparent plate member 61 from abrasion due to friction with the original 69.

Reference numeral 65 is a light receiving element for reading the formed original image and converting it into an electric signal, 66 is an illuminating light source for illuminating the original reading position 70, and 67 is a light receiving element 65 and an illuminating light source 66 in the longitudinal direction. It is a board mounted in a row.

The transparent plate member 61 and the substrate 67 are held in the casing in such a positional relationship that the original image at the original reading position 70 is formed on the light receiving element 65.

For example, in FIG. 11, the optical path length from the document reading position 70 to the hemispherical reflecting mirror 62 in the first row is set to the focal position of the hemispherical reflecting mirror 62 in the first row, and
If the optical characteristics of the hemispherical reflecting mirrors 62 in the second row and the second row are equal, the image forming position is the position of the optical focal length of the hemispherical reflecting mirrors 62, and the image forming magnification is -1. Also,
As shown in the third embodiment, the first-row hemispherical reflecting mirror 62
By forming a roof mirror on the reflecting surface 63 between the second-row hemispherical reflecting mirror 62 and an erecting equal-magnification image can be obtained.

Although the LA surface 61a and the document surface 61b are parallel to each other in the fifth embodiment, they need not be parallel if the document reading position 70 and the light receiving element 65 are accurately connected by an optical path to form an image. In addition, the reflection film 63 is not limited to the three surfaces as long as the signal processing of the light receiving element 65 is not hindered even in the erecting equal-magnification image.
In addition, it is a simple application according to the present invention that the hemispherical reflecting mirror 62 may be formed into an aspherical surface in order to reduce aberrations or change the viewing angle, and need not be described again. .

FIG. 12 shows an LA according to another embodiment of the present invention.
FIG. In the figure, 74 is a reflective Fresnel lens used in place of the hemispherical reflecting mirror, and 75 is a linear Fresnel lens used in place of the cylindrical lens. Also in this configuration, the same optical system as the above configuration can be configured.

FIG. 13 shows an LA according to another embodiment of the present invention.
FIG. When the transparent plate member 81 is made thin to reduce the size of the entire optical system, the incident angle of light on the hemispherical reflecting mirror 82 becomes extremely large, and astigmatism and distortion cannot be corrected sufficiently to obtain sufficient resolution. I will not be able to. In order to solve this problem, the hemispherical reflecting mirror 82 is placed on the LA surface 81a so that the incident angle of light on the hemispherical reflecting mirror 82 becomes small.
It is formed to be inclined with respect to and the inclined surface is used instead of the plane mirror of the document surface to utilize the total reflection of light.

In FIG. 13, 81c is a transparent plate member 81.
A convex portion of the lens, a hemispherical reflecting mirror 82, a reflecting film 83, a document reading position, an incident surface 85, and first to fifth inclined surfaces 86 to 90. The image of the original enters from the incident surface 85, is reflected by the reflection film 83, and is directed to the first inclined surface 86. Total reflection is performed by the first inclined surface 86, collective reflection is performed by the hemispherical reflecting mirror 82, and second inclined surface 87. And the third inclined surface 88 for total reflection, again the hemispherical reflecting mirror 82 for collective reflection, the fourth inclined surface 89 and the fifth inclined surface 90 for total reflection, and the LA surface 81a.
It emits at a right angle.

As described above, the transparent plate member can be made thin, and since the total reflection by the inclined surface is utilized, the number of the surface on which the reflective film is formed can be reduced, so that the manufacturing cost can be reduced.

[0063]

As described above, according to the present invention, the plane reflecting mirror and the spherical or aspherical reflecting mirror are formed integrally with the transparent plate member on the surface of the transparent plate member, and the optical path is formed inside the transparent plate member. As a result, since the structure is formed by combining the formation positions of the respective reflecting mirrors, it is possible to provide a lens array that is easy to manufacture, does not require high assembly precision, and is inexpensive.

[Brief description of drawings]

FIG. 1 is a perspective view of an LA according to a first embodiment of the present invention.

FIG. 2 is a sectional view of the LA according to the first embodiment of the present invention taken along the line AA shown in FIG.

FIG. 3 is a perspective view of an LA according to a second embodiment of the present invention.

FIG. 4 is a sectional view of the LA according to the second embodiment of the present invention taken along the line BB in FIG.

FIG. 5 is a perspective view of an LA according to a third embodiment of the present invention.

FIG. 6 is a sectional view taken along line CC of FIG. 5 showing LA in the third embodiment of the present invention.

FIG. 7 is a sectional view of the LA according to the third embodiment of the present invention taken along the line DD in FIG.

FIG. 8 (a) is a perspective view showing the shielding structure by the mirror surface V groove of LA in the fourth embodiment of the present invention. FIG. 8 (b) shows the shielding structure by the ground glass V groove of LA in the fourth embodiment of the present invention. FIG. 8A is a perspective view of the LA according to the fourth embodiment of the present invention.
EE line sectional view of the mirror surface V groove described in

FIG. 9 (a) is a perspective view showing a shielding structure of an LA in the fourth embodiment of the present invention by a reflection film. (B) FIG. 9 (a) of LA in the fourth embodiment of the present invention.
FF line sectional view described in

FIG. 10 is a perspective view of an LA transparent plate member in the fifth embodiment of the present invention.

FIG. 11 is an LA diagram of the fifth embodiment of the present invention.
GG line sectional view of the transparent plate member described in

FIG. 12 is a perspective view of an LA according to another embodiment of the present invention.

FIG. 13 is a sectional view of an essential part of LA in another embodiment of the present invention.

FIG. 14 is a principle diagram of an image forming optical system having a structure in which two conventional lenses are combined.

FIG. 15 is a structural diagram of FIG. 14 in an array form.

FIG. 16 is a principle diagram of a conventional imaging optical system having a structure in which a lens and a mirror are combined.

FIG. 17 is a structural diagram in which the pair of lenses and the roof mirror shown in FIG. 16 are arrayed.

FIG. 18 is a structural diagram of a conventional imaging optical system using LA and RMA.

[Explanation of symbols]

11, 21, 31, 51, 61, 81 Transparent plate members 11a, 21a, 31a, 51a, 61a, 81a L
A surface 11b, 21b, 31b, 51b, 61b, original surface 11c, 21c, 31c, 51c, 61c, 81c Lens convex portion 12, 22, 32, 62, 82 Hemispherical reflecting mirror 13, 23, 33, 56, 63 , 83 Reflective film 14, 24, 34 Hard coat film 15, 25, 35, 65 Light receiving element 16, 26, 36, 66 Illuminating light source 17, 27, 37, 67 Substrate 18, 28, 38 Housing 19, 29, 39, 69 Originals 20, 30, 40, 70, 84 Original reading position 31d Stepped convex portion 41 Roof mirror array (RMA) 52, 53, 54, 55 Shield groove slope 61d Step 61e Cylindrical lens portion 71, 85 Incident surface 72 Emission surface 73 Shielding groove 74 Reflective Fresnel lens 75 Linear Fresnel lens 86 First inclined surface 87 Second inclined surface 88 Third Inclined surface 89 Fourth inclined surface 90 Fifth inclined surface 101 Original 102, 104 Lens 103 Focus 105 Sensor 106, 107, 109 Lens array (LA) 108 Roof mirror 108a, 108b, 110a, 110b Two-sided 110 Roof mirror array (RMA) 111 Optical path separation mirror

Claims (17)

[Claims] 1. A transparent plate-shaped member having a substantially rectangular cross section and having a predetermined length, and a plurality of convex bulging portions formed on one of two surfaces of the plate-shaped member facing each other. And a reflection film formed on both surfaces of a surface of the plate member including the convex bulging portion and a part of another surface facing the surface. 2. The lens array according to claim 1, wherein the convex bulging portion is formed in a hemispherical surface. 3. The lens array according to claim 1, wherein the convex bulging portion is formed into an aspherical surface. 4. The lens array according to claim 1, wherein the convex bulges are formed in one row in the longitudinal direction of the plate-like member at predetermined intervals. 5. The convex bulging portions are formed in two rows at predetermined intervals in the longitudinal direction of the plate-like member, and mutually rows are formed in parallel at predetermined intervals. 1. The lens array according to 1. 6. The lens array according to claim 5, wherein the convex bulges forming the respective rows have different curvatures. 7. A vertical angle is perpendicular to the other surface facing the surface on which the convex bulge is formed, and a vertical bisector of the vertical angle is the center line of the convex bulge. 7. The lens array according to claim 5, wherein stepped convex portions are formed in the same number and at the same intervals as the convex bulging portions so as to coincide with each other. 8. A direction in which a center line of the convex bulges forming the first row and a center line of the convex bulges forming the second row spread toward the surface of the plate member. A plurality of inclined surfaces that are inclined with respect to the center line of the convex bulging portion are formed on the other surface facing the surface on which the convex bulging portion is formed, and the inclination angle is the inclination. 7. The lens array according to claim 5, wherein the light totally reflected from the surface is formed to enter the convex bulging portion. 9. The lens array according to claim 1, further comprising a separating means provided between the adjacent convex bulges for separating adjacent optical systems. 10. The lens array according to claim 9, wherein the separating means is a V-shaped groove formed between the adjacent convex bulges. 11. The lens array according to claim 10, wherein a reflective film is formed on the surface of the V-shaped groove. 12. The lens array according to claim 11, wherein a groove surface of the V-shaped groove is formed like frosted glass. 13. The lens array according to claim 9, wherein the separating means is a non-reflective surface formed between the adjacent convex bulges. 14. A cylindrical lens is formed in a longitudinal direction of the plate-shaped member at a portion where illumination light for illuminating an original enters the plate-shaped member.
3. The lens array according to any one of 3 above. 15. A step plane having a step and a step slope continuous with the step plane and the other surface are provided on another surface facing the surface on which the convex bulge is formed, The step plane is used as the emission surface of the illumination light, the step slope is used as the incident surface of the document reflected light, and the inclination angle of the step slope is formed so that the angle formed by the step inclined surface and the document reflected light is perpendicular. The lens array according to claim 1, wherein the lens array is formed. 16. The emitting surface is formed on a part of the surface on which the convex bulging portion is formed so that the angle formed by the light emitted from the plate-shaped member and the emitting surface is perpendicular to each other. The lens array according to any one of claims 1 to 13. 17. A substrate on which a light source for illuminating an original and a light receiving element for receiving light emitted from the plate member are mounted, and the plate member so that the plate member holds a predetermined optical position. 14. The lens array according to claim 1, wherein the plate-shaped member is housed and fixed in a housing.