JPH06169372A - Camera type image reader - Google Patents

Abstract

PURPOSE:To improve the performance of the camera type image reader by decreasing the number of components arranged above a document. CONSTITUTION:Some of the constituent members are put in a pillar 13 to reduce the weight of a head part 12 and also suppress the vibration generated when an image on the document 14 is read. The lighting means 22 of the camera type image reader is prolonged in life since the light projected from a light source is efficiently guided to a read range of the document. Then variation in optical path length caused when the two-dimensional image on the document is read out by the linear image pickup element 8 of the camera type image reader is corrected by finely moving an irregular reflecting mirror. Further, the noise generation at the time of the image read is suppressed by putting the lighting means away from the linear image pickup element 8.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a camera type image reading apparatus for reading a two-dimensional image of an original by moving a one-dimensional solid-state image pickup device for reading an image of a one-dimensional reading range of the original.

[0002]

2. Description of the Related Art FIG. 20 shows, for example, Japanese Patent Laid-Open No. 62-4396.
FIG. 21 is a view showing the arrangement state of the constituent members of the conventional camera-type image reading device shown in Japanese Patent Laid-Open No. 8. 1 is a light source with a small light emitting portion such as a halogen lamp, 2 is a concave reflecting mirror, 3 is a condenser lens, 4,
Reference numeral 6 denotes a cylindrical convex lens, which constitutes an illuminating means for condensing light linearly so that the illuminance of only the reading range on the surface of the original 14 is increased by 2 to 6.

Further, 7 is a reading lens, 8 is a one-dimensional solid-state image pickup device (hereinafter referred to as an image pickup device) for reading an image in a line, and 9 is an image pickup device 8 moved in the sub-scanning direction for reading a two-dimensional image. The image pickup device moving means 10 for moving is an illumination light moving means for moving the light that linearly irradiates the surface of the document 14 so as to follow the movement of the image pickup device 8 in the sub-scanning direction. The constituent members 1 to 10 are housed in the outer box 11, and the outer box 11 and these constituent members 1 to 1
The head portion 12 is constituted by 0. The outer box 11 is supported by the columns 13, and the head portion 12 is arranged above the document 14. Reference numeral 15 is light linearly condensed on the surface of the original 14.

Next, the operation will be described. The conventional camera-type image reading apparatus configured as described above is a document
An image sensor 8 for reading an image in the three-dimensional reading range through the reading lens 7.
Image on. Then, when reading a two-dimensional image of the original 14, the image pickup device moving means 9 is driven to move the image pickup device 8 in the X-axis direction. In this case, in order to increase the reading speed, it is necessary to increase the illuminance on the surface of the document 14 and shorten the charge time of the charges of the image pickup device 8. Therefore, in the conventional camera-type image reading device, the illumination is linearly focused so that only the reading part of the image sensor 8 is illuminated, and the linearly focused light is made to follow the movement of the image sensor 8. To move. Thereby, the illumination can be efficiently used.

Further, the conventional camera-type image reading apparatus is provided with a concave mirror 2 for returning the light emitted rearward to the light source position again in order to effectively utilize the light emitted rearward from the light source 1. Then, the light projected forward from the light source 1 and the light reflected from the concave mirror 2 are beam-formed into parallel light through the condenser lens 3, and are linearly condensed by the cylindrical lenses 4 and 6. . In this case, since the light reflected by the concave mirror 2 is returned to the light source 1, the light projected backward from the light source 1 can be used as if it was projected forward from the light source 1. Can be higher.

Further, FIG. 23 shows, for example, Japanese Patent Laid-Open No. 62-29.
This is another conventional camera-type image reading device disclosed in Japanese Patent No. 1259. Another conventional camera-type image reading apparatus will be described below with reference to FIG. Note that FIG.
The same reference numerals will be given to the same or similar members as those in and the description will be omitted. Reference numeral 17 denotes one of the originals 14 for reading a two-dimensional image.
Optical path conversion mirror that scans the light focused on the dimension reading range,
Reference numerals 18a to 18c correspond to the changes in the optical path length due to the rotation of the optical path conversion mirror 17, and each member constituting the optical path length correction means 18 for keeping the entire optical path length constant, 19a to 1c.
Reference numeral 9f is an optical path conversion mirror 1 linked with the optical path length correction means 18.
These are members that make up the mirror rotation means 19 that rotates the mirror 7.

Next, the operation will be described. In the other conventional camera-type image reading apparatus configured as described above, the optical path conversion mirror 17 is rotated and the two-dimensional image of the original 14 is read by the image pickup element 8. In this case, the optical path conversion mirror 17
When is rotated, the optical path length from the optical path conversion mirror 17 to the document 14 changes. Therefore, the distance between the optical path conversion mirror 17 and the reading lens 7 is changed by the optical path length correction means 18 so that the entire optical path length becomes constant.

Therefore, the rotation of the optical path conversion mirror 17 and the movement of the optical path length correction means 18 must move in conjunction with each other. Therefore, the mirror rotating means 19 controls the movement of the optical path length correcting means 18 by means of the cams and the links 19a to 19f.
It is converted into the rotational movement of and is operated in conjunction with the optical path length correction means 18. Further, in order to read the document 14 at high speed, it is necessary to brighten the reading range of the document 14. Therefore, on both sides of the reading lens 7, illumination means 21 for linearly focusing the light on the original 14 within the reading range is provided. By arranging the illuminating means 21 on both sides of the reading lens 7, the optical path length of the light projected from the illuminating means 21 can be kept constant, so that the light projected from the illuminating means 21 is always The document 14 moves while following the range of the document 14 in a linearly focused state.

[0009]

As described above, the conventional camera type image reading apparatus is constructed such that, for example, in the apparatus shown in FIG. 20, the outer box 11 houses all the constituent members 1 to 10. Therefore, the head portion 12 becomes large and the original document 14
Vibration is likely to occur when reading. In order to suppress the generation of vibration, the support column 1 that supports the head portion 12
Since it is necessary for 3 to have sufficient strength, there is a problem in that the camera type image reading device becomes large.

Further, in the conventional camera-type image reading apparatus, as shown in FIG. 22, since the reflected light from the concave reflecting mirror 2 behind the light source 1 returns to the filament of the light source 1, the temperature of the filament changes. There is a problem that it rises, the life is shortened, part of the light is blocked by the filament and is not projected forward, and in order to efficiently collect the light linearly, Two concave reflection mirrors 2
Since the two cylindrical lenses 4 and 6 shown in FIG. 20 are required, there is a problem that the configuration is complicated, the device becomes large, and the cost also rises. Further, since the light is condensed by the cylindrical lenses 4 and 6, the illuminance at the central portion of the reading range is theoretically increased (the law of cosine fourth power) at the condensing position. Therefore, when the image of the document 14 is read by the image sensor 8, there is a problem that the brightness of the peripheral portion is significantly reduced by the same theory. On the other hand, if the number of optical systems and illuminations is increased in order to eliminate unevenness in illuminance, there is a problem that the device becomes large. Also, as shown in FIG.
The condensing by the cylindrical lens 3 has a problem that the aperture angle α is limited and a large amount of light cannot be collected.

Further, in the other conventional camera type image reading apparatus shown in FIG. 23, it is necessary to correct all changes in the distance from the optical path conversion mirror 17 to the document 14 by linear movement of the optical path length correction means 18. Therefore, the moving distance of the optical path length correction means 18 becomes long. Therefore, there is a problem that the movement accuracy is difficult to obtain, and there is a problem that the device becomes large because a large-scale moving means is required. On the other hand, since the image noise of the image pickup device 8 increases due to the rise in temperature, it is necessary to avoid providing a device that causes a temperature rise in the vicinity of the image pickup device 8. However, in the conventional camera-type reading apparatus shown in FIG. 23, since the illuminating means 21 is provided in the vicinity of the image sensor 8, there is a problem that the temperature rise of the light source adversely affects the image sensor 8.
Further, since the illumination means 21 is near the reading lens 7,
There is a problem that the leakage of light affects the image.

The invention of claim 1 has been made to solve the above-mentioned problems, and by reducing the number of parts accommodated in an outer box arranged above the document, An object of the present invention is to provide a camera-type image reading device that can reduce the weight of the head portion, suppress the occurrence of vibration, and reduce the size.

Further, the invention according to claims 2 to 4 can easily maintain the illuminance distribution on the original uniformly without increasing the size of the illuminating means and increasing the number of parts, and the light is projected from the light source. It is an object of the present invention to provide a camera-type image reading device that can efficiently collect the emitted light on a document and further extend the life of the light source.

Further, the invention of claim 5 provides a structure of a camera type image reading apparatus which can correct the distance between the document surface and the reading lens with a small moving distance of the concave-convex reflecting mirror, and can downsize and simplify the apparatus. The purpose is to

Further, according to the invention of claim 6, there is provided a camera type image input device having an illumination system in which the image pickup device is not easily influenced by the temperature of the light source, the illumination distance can be kept constant, and the influence of light leakage is small. The purpose is to provide.

[0016]

According to another aspect of the present invention, there is provided a camera-type image reading apparatus in which a reflection mirror for bending an optical path in parallel with an original is arranged on the upper surface of the original, and further, on the bent optical path. The reading lens was placed in the. The reflection mirror and the reading lens are supported by the column via an outer box. An image formed by the reading lens is formed on an image pickup device that is movably supported by the support, and the image pickup device, the image pickup device moving means, and the illumination light moving means are arranged substantially linearly in the support. Is.

Further, in the camera type image reading apparatus according to the invention of claim 2, the illuminating means is constituted by combining one small light source and a plurality of cylindrical concave reflecting mirrors having different directions and curvatures. The respective reflecting mirrors are continuously connected to each other, and the combination angle and width are determined so that the reflected light irradiates the document surface with a desired width.

Further, in a camera type image reading apparatus according to a third aspect of the present invention, the illuminating means has one or two small light sources and a rear mirror having a semi-elliptical shape at the rear portion of the light source, and the light source is The rear mirrors are arranged at the positions of the two focal points of the ellipse, and further, a condenser lens for condensing the light on the reading portion is provided on the front surface of each light source.

Further, in the camera type image reading apparatus according to the invention of claim 4, the illuminating means comprises a light source, a rear concave reflecting mirror and a condenser lens. Then, the rear concave mirror is formed in a hemispherical shape so that the position of the light source filament can be made substantially continuous so that the virtual image filament formed by the reflected light does not overlap with the real image filament and is in a substantially continuous position. It is offset from the center of.

Further, in the camera type image reading device according to the invention of claim 5, the optical path length correcting means comprises a pair of concave and convex reflecting mirrors having at least two steps of right and left concave and convex. The pair of concave-convex reflecting mirrors are arranged so that their reflecting surfaces face each other and mesh with each other, and the optical path length from the document to the reading lens is fixed in correspondence with the rotation of the concave-convex reflecting mirrors during sub-scanning. The distance between the pair of concave-convex reflecting mirrors is changed so that

Further, in the camera-type image reading apparatus according to the invention of claim 6, the width of the final stage mirror for making light incident on the reading lens of the concave-convex reflection mirror of the optical path length correcting means is narrower than the width of the preceding stage mirror. The illuminating means is set on the plane that is symmetrical with respect to the optical path plane formed by the image sensor and the optical axis of the reading lens with respect to the final stage mirror.

[0022]

According to the first aspect of the invention, the camera-type image reading apparatus is light in weight because it has a small number of components on the surface of the document, easy to support, and less likely to cause unnecessary vibration. In addition, the other components are arranged in a straight line along the columns by taking advantage of the shape of the columns that support the components on the document surface, so that the necessary components can be stored without enlarging the device. can do.

According to the camera type image reading apparatus of the second aspect of the invention, the illuminance distribution on the document surface can be made uniform with a small number of parts, and the size of the illumination means can be prevented from increasing. The lighting efficiency can be improved.

Further, in the camera type image reading apparatus according to the third aspect of the invention, the illuminance distribution on the document surface can be easily made uniform without increasing the apparatus size.

Further, in the camera type image reading apparatus according to the invention of claim 4, the light at the rear of the light source can be effectively used without shortening the life of the light source.

Further, in the camera type image reading device according to the invention of claim 5, the optical path length of a large distance can be corrected by the small moving amount of the concave-convex reflecting mirror. Therefore,
The amount of movement of the concave-convex reflection mirror can be reduced, the size of the device can be reduced, and the movement accuracy can be improved.

In the camera-type image reading device according to the sixth aspect of the present invention, the influence of the temperature rise of the light source on the image pickup device can be reduced while keeping the illumination distance constant.

[0028]

【Example】

Example 1. An embodiment of the present invention will be described below with reference to the drawings. FIG. 1A is a perspective view showing a first embodiment of the present invention, and is the same as the conventional camera-type image reading apparatus shown in FIGS. The reference numerals are given and the description is omitted.

In FIG. 1, reference numeral 20 is a reflection mirror that changes the optical path from the original 14, and the reflection mirror 20 and the reading lens 7 are supported by a column 13 via an outer box 11, and the reflection mirror 20 and the reading lens are shown. The head portion 12 is constituted by 7 and the outer box 11. Further, 22 is an illuminating means, and the illuminating means 22 is provided with a halogen lamp 1 and a concave reflecting mirror 5 which will be described later, and collects light linearly so that the illuminance of only the one-dimensional reading range on the original 14 is increased. To do. Two
Reference numeral 3 denotes an illumination light moving unit that moves the linear light projected from the illumination unit 22 so as to follow the movement of the image sensor 8 in the sub-scanning direction (two-dimensional direction).

The image pickup device 8, the image pickup device moving means 9, the illuminating means 22 and the illumination light moving means 23 are housed in the column 13. By providing the illumination light moving means 23 below the image pickup device moving means 9, the moving means 9 and 23 can be arranged close to each other, which will be described later for each moving means 9 and 23. 1 drive motor 24
It can be used together. As a result, the camera-type image reading device can be downsized.

Next, the operation will be described. The light projected from the halogen lamp 1 becomes the linear light 15 that is focused on the reading range on the original 14 via the illumination reflection mirror 23A of the illumination means 22. The condensed light 15 is reflected by the original 14 and enters the reflection mirror 20. The light incident on the reflection mirror 20 is reflected in a state of being refracted by 90 °, and is incident on the image pickup surface of the image pickup device 8 via the reading lens 7. As a result, the characters and the like in the reading range of the original 14 are read by the image sensor 8.

Next, the drive motors 24 (see FIG. 1B) for the moving means 9 and 23 are driven to operate the image pickup device moving means 9 and the illumination light moving means 23. As a result, the ball screw 9A rotates to move the image pickup device 8 in the vertical direction along the support column 13, and at the same time, the illumination reflection mirror 23
A rotates about the axis 23B. Therefore, the light linearly condensed on the document 14 moves in the arrow direction along the document 14 following the movement of the reading range of the image sensor 8. As a result, the image sensor 8 can read the two-dimensional image of the document 14.

Next, the image pickup device moving means 9 and the illumination light moving means 23 will be described in detail with reference to FIG. In the figure, 24 is a drive motor, 9B is a ball screw 9A.
Is a linear guide that is screwed to. The drive motor 24 and the ball screw 9A are connected to each other via a bellows 9C that alleviates the axial deviation. Linear guide 9B
The image pickup device 8 is fixed to, and the image pickup device 8 moves up and down by the rotation of the ball screw 9A. Also, 9A ~
9C and 24 compose the image pickup device moving means 9.

Reference numeral 23D is a gear box, which is in engagement with a worm gear, a spur gear, a cam, etc.
The rotation of 4 rotates the bar 23C clockwise in FIG. 1 (B). As a result, the bar 23C pushes down the left end portion of the illumination reflection mirror 23A, so that the illumination reflection mirror 23A rotates counterclockwise. Therefore, the light projected from the light source 1 reflected by the illumination reflection mirror 23A is
The document 14 is scanned in the left-right direction. Also, 23A,
23C, 23D, and 24 constitute the illumination light moving means 23.

FIG. 2 is a diagram showing an arrangement state of constituent members of the camera-type image reading apparatus of the first embodiment, and FIG. 21 shows an arrangement state of constituent members of the conventional camera-type image reading apparatus as described above. It is a figure. As is apparent from FIG. 21, in the case of the conventional camera-type image reading device, the illuminating devices 1 and 2, the reading lens 7, the one-dimensional image sensor 8, the image sensor moving means 9, and the illumination light moving means 10 are inside the outer box 11. It is stored in.
Therefore, the head portion 12 becomes large and the weight increases.

On the other hand, in the case of the camera-type image reading apparatus of the first embodiment, the optical path of the reading optical system is bent by the reflecting mirror 20 so that the image is formed near the column 13 via the reading lens 7. As shown in FIG. 2, the one-dimensional image sensor 8 and the image sensor moving means 9 can be housed in the column 13, and the illumination means 22 and the illumination light moving means 23 can be housed in the column 13.

In order to increase the strength of the pillar 13, a hollow structure, a rib structure or the like is usually adopted. Therefore, Example 1
With such a configuration, the space of the column 13 can be used. As shown in FIG. 2, the head portion 12 includes only the reflection mirror 20, the reading lens 7 and the outer box 11, so that the head portion 12 is small and lightweight, and the strength of the support column 13 that supports the head portion 12 can be reduced. it can.

In the first embodiment described above, the camera type image reading apparatus of the type in which the image pickup device 8 is moved to read the two-dimensional image of the original 14 has been described, but the present invention is not limited to this.
The two-dimensional image of the original 14 may be read by fixing the image pickup device 8 and rotating the reflection mirror 20.

Further, in the first embodiment, the support column 13 is erected vertically from the original document 14, but it may be arranged at an inclination, and the optical axis of the reflection mirror 20 is parallel to the original document 14. Although set, the optical axis may be tilted with respect to the original 14. Further, although the support column 13 and the outer case 11 are attached so as to be orthogonal to each other, the present invention is not limited to this, and the support box 13 and the outer box 11 may be attached at an angle so as to intersect.

Further, in the first embodiment, the reflection mirror 20 is used.
Although the reading lens 7 and the reading lens 7 are arranged above the document 14, the reading lens 7 may be arranged on the support column 13, and a part of the components housed in the support column 13 is stored in the outer box 11. It is also possible.

In the first embodiment, the image pickup device moving means 9 and the illumination light moving means 23 are driven by one drive motor, but each moving means 9, 23 may be provided with an individual drive motor.

Example 2. Next, the illumination means 22 of the camera-type image reading apparatus of the second embodiment will be described. As shown in FIG. 1, the illumination means 22 includes a halogen lamp (light source) 1 and the above-mentioned concave reflection mirror 5, and the concave reflection mirror 5 is provided below the halogen lamp 1. The concave reflecting mirror 5 is divided into seven mirrors 5a, 5b, 5b, 5c, 5c, 5d and 5d as shown in FIGS. 3 (A) to 3 (D).

As shown in FIG. 3C, the mirrors 5a, 5a
Each of b, 5c, and 5d has an elliptic cylindrical mirror cut obliquely, and the mirrors 5b, 5c, and 5d are attached to the mirror 5a at an angle. The elliptical curvature of each mirror is set according to the distance to the light source 1 and the distance to the document 14. Further, the light source 1 is arranged at the first focal position of the ellipse of these mirrors.

When the light source 1 is arranged at the first focus position of the ellipse, the light reflected by each mirror is condensed at the second focus position. Therefore, when the mirror is formed in an elliptic cylindrical shape, the light reflected by the mirror is condensed at the second focus in the direction having the elliptic curvature and diffused in the direction not having the elliptic curvature. The light reflected by the concave reflection mirror 5 composed of the mirrors 5a, 5b, 5c and 5d is linearly condensed on the original 14 as shown in FIG.

Next, the operation will be described. The shapes and mounting angles of the respective mirrors 5a, 5b, 5c, 5d will be described with reference to FIGS. Here, since the entire mirror is symmetrical with respect to the XY plane and the ZX plane, this mirror was divided into four parts on the XY plane and the ZX plane to make it easy to see the figure, and the light was emitted from the light source. The position where the light reaches the document is shown for each mirror (hatched portion in FIG. 3B. Note that only the mirror 5a is not divided in the XY plane for easy understanding).

FIG. 5 shows how the light striking the mirror 5a is reflected. The reflected light reflected by both ends 40a, 40b of the XZ plane cut at the center is guided to the vicinity of both ends 14a, 14b of the document 14. Therefore, the mirror 5a
Even if it is larger than this, the light will still be out of the original 14 and the mirror 5
If a is made smaller than this, the light will be at both ends 14a of the original 14,
I can't reach 14b. That is, the width of the mirror 5a in FIG. 4 is the minimum width that the reflected light hits both ends 14a and 14b of the original 14. Also, both ends 40c and 40d on the outside of the mirror 5a
The width of the reflected light reflected by is also set so as to hit both ends 14a and 14b of the original. That is, the mirror 5a in FIG.
Is formed by cutting a cylinder into a necessary minimum size that allows light to reach both ends 14a and 14b of the original 14.

Next, the mirror 5b will be described. The mirror 5b is an elliptic cylinder cut obliquely, and FIG. 6 shows how the mirror 5b reflects light. One end 40e of the X-Z cross section of the mirror 5b is located near the joint 40b of the mirror 5a. As described above, the light reflected by the end portion 40a of the mirror 5a reaches the original 14a, and it is useless to further widen the width of the mirror 5a. Therefore, the mirror 5b is angled so that the light reflected by the end 40e reaches the end 14a of the document. And mirror 5b
The other end 40f is set so that the reflected light reaches the end 14b of the document. Also, both ends 4 on the outside of the mirror 5b
Similarly, the light reflected at 0 g and 40 h is reflected at both ends 14 of the original 14.
The width of the mirror 5b is set so as to reach a and 14b. That is, similarly to the mirror 5a, the mirror 5b is also formed by cutting a cylinder into a necessary minimum size such that light reaches both ends 14a and 14b of the document.

FIG. 7 shows the reflection state of the mirror 5c. The width and mounting angle of the mirror 5c are set similarly to the mirror 5b. Thereby, the X- of the mirror 5c
One end 40i of the Z section is joined near the joint 40f of the mirror 5b, and the reflected light reflected at one end 40i is the original 1
4 is led to the end portion 14a. Also, the other end 4 of the mirror 5c
The reflected light reflected at 0j is guided to the end portion 14b of the document 14. Further, the light reflected by both ends 40k, 40l on the outside of the mirror 5c is similarly guided to both ends 14a, 14b of the original 14.

Further, FIG. 8 shows a reflection state of the mirror 5d. One end 40m of the X-Z section of the mirror 5d is located near the joint 40j of the mirror 5c. And
The mounting angle of the mirror 5d is set so that the light reflected at one end 40m reaches the central portion 14c of the original 14. The other end 40m of the mirror 5d is set so that the reflected light is guided to the end 14b of the original 14. Further, the outer end 40p of the mirror 5d is set so that the reflected light is guided to the central portion 14c of the document 14. That is, each mirror 5d can guide the reflected light to the half range of the original 14. As a result, the concave reflection mirror 5 can linearly collect the light projected from the halogen lamp 1 on the original 14 (see FIG. 4), and further reduce the illuminance near both ends 14a and 14b of the original 14. The linear light that is corrected and condensed on the original 14 can be maintained uniformly.

According to the illumination means 22 of the second embodiment,
Since the light projected from the light source 1 can be linearly condensed on the original 14 only by the concave reflection mirror 5, the opening angle β is made larger than the conventional opening angle α of FIG. 22 as shown in FIG. Can be set. Therefore, the light reflected by the concave reflection mirror 5 can be efficiently collected.

Further, the illumination means 22 of the second embodiment is the light source 1
Further, since it is composed of two members, that is, the concave reflection mirror 5, the number of parts can be reduced, the cost can be reduced, and the size can be easily reduced. Further, since each of the divided reflecting mirrors can be set to the minimum necessary size for illuminating the reading range, it is possible to improve the irradiation efficiency in a limited space. Further, since the irradiation range can be easily set by each mirror, the irradiation intensity distribution can be easily designed. Furthermore, since the light reflected from the reflecting surface is not concentrated and returned to the light source 1, it is possible to prevent the temperature rise of the filament of the light source 1 and reduce the amount of light blocked by the filament.

Although the concave reflecting mirror 5 is divided into seven in the second embodiment, the number of divisions is not limited to seven. Further, in the second embodiment, the mirrors 5d on both ends illuminate only half of the original 14, but this need not be half of the original 14, and other mirrors do not cover the entire original 14, It is also possible to freely change the half of the original 14 or only the both ends 14a and 14b in accordance with the required intensity distribution.

Example 3. Next, the illumination means 22 of the third embodiment
A will be described in detail. FIG. 10 shows a schematic diagram of the third embodiment. In FIG. 10, members similar to those in the first and second embodiments are designated by the same reference numerals and the description thereof will be omitted. Figure 10
In the figure, reference numeral 30 denotes a concave reflection mirror, which is a concave reflection mirror 3.
0 is formed in a semi-elliptical shape. Then, for example, the light source 1 having a small light emitting portion such as a halogen lamp is used as the first focus position 30a and the second focus position 30 of the concave reflection mirror 30.
It is installed in b. As a result, the light projected from the light source 1 arranged at the first focal position 30a is reflected by the concave reflecting mirror 30, condensed at the second focal position 30b, and arranged at the second focal position 30b. The light projected from the light source 1 is reflected by the concave reflection mirror 30 and condensed at the first focal position 30a. Then, the light focused on the first and second focal positions 30a, 30b is linearly focused on the original 14 via the condenser lens 3. The illuminating means 22a is the concave reflecting mirror 3
0, two light sources 1, and two condenser lenses 3.

By constructing the illumination means 22a as described above, it is possible to use only one concave reflection mirror 30.
Since the light emitted from the two light sources 1 can be condensed on the original 14, a sufficient amount of light can be obtained without increasing the size of the device. Further, since the number of the light sources 1 can be two, the range in which one light source 1 illuminates the original document is half that of the conventional one, and the illuminance of the original document 14 can be made closer to uniform than the conventional one. A cylindrical lens is usually used as the condenser lens 3 for the purpose of condensing the reflected light into a linear shape. However, since the shape of the filament of the light source 1 is close to a line, an ordinary convex lens is used as the condenser lens 3. It is also possible to use a method in which the filament is imaged on the original surface.

Example 4. In the third embodiment, the light sources 1 are arranged at the two focal points 30a and 30b of the semi-elliptical sphere. However, when the light amount of the light source 1 is sufficient, one light source 1 is provided as in the fourth embodiment shown in FIG. Then, the light source may be arranged at one focus position of the ellipsoid. According to this, the light projected to the rear of the light source 1 is reflected by the concave reflection mirror 30 and condensed at the other focal position. Therefore, when two condenser lenses 3 are arranged in front of the bifocal position as shown in FIG. 11, the actual light source 1 is one, but it is as if two light sources 1 were provided (pseudo two light sources). Light emission), uniform illuminance, miniaturization, and
It is possible to save the power consumption, reduce the cost, and extend the life. In FIG. 11, the same members as those of the third embodiment shown in FIG. 10 are designated by the same reference numerals and the description thereof will be omitted.

Example 5. Next, the illumination means of the fifth embodiment will be described in detail. FIG. 12 shows the illumination means 2 of the fifth embodiment.
2b is shown, and when the filament length of the light source 1 is a, the illuminating means 22b is arranged by displacing the light source 1 from the center of the concave reflection mirror (back concave reflection mirror) 2 by a / 2. There is. In this way, when the light source 1 is displaced from the center of the concave reflection mirror 2 by a / 2, the reflected light from the concave reflection mirror 2 forms a virtual image 33 centered at the position of −a / 2, so that the length of the filament is An optical system as if there were 2a can be constructed. In this way, when the light is focused on the original 14, even if the length a of the filament is small, a virtual image 33 having a length of 2a obtained by adding the real image and the virtual image of the filament is passed through the condenser lens 3. Since the light is focused on the original 14, the entire area of the original 14 can be illuminated.
Therefore, the total luminous flux can be efficiently used without causing a decrease in the life of the filament and a decrease in efficiency due to the shielding of the filament itself.

Example 6. In the fifth embodiment, the filament of the light source 1 is arranged at a position where a virtual image of the filament can be formed in a straight line continuously with the filament of the light source 1, but the filament may be arranged as shown in FIG. That is, the virtual image 33 may not be formed continuously with the filament of the light source 1, but may be formed with a slight gap. With this configuration, the illuminance distribution of the original 14 can be lowered near the center, and uniform light can be condensed on the original 14.

In the fifth and sixth embodiments, the virtual image 33 is formed beside the filament, but the virtual image 33 may be formed above or below the filament. In addition, Examples 5 and 6
In, when the position of the filament is largely deviated from the center of the concave reflection mirror 2, the light diverges and cannot be effectively utilized.
The filament is characterized in that it is displaced in the range shown in FIGS. 12 and 13 near the center of the concave reflection mirror 2.

Example 7. Next, the camera-type image reading apparatus according to the seventh embodiment will be described in detail. Embodiment 7 shown in FIG. 14 is an improvement of the conventional camera-type image reading apparatus of FIG. In FIG. 14, the same members as those of the conventional camera-type image reading apparatus shown in FIG. 23 are designated by the same reference numerals and the description thereof will be omitted. In FIG. 14, 42a is an upper concave-convex mirror for correcting the optical path length, and 42b is a lower concave-convex mirror for correcting the optical path length. The upper concave-convex mirror 42a and the lower concave-convex mirror 42b are arranged so as to face each other and mesh with each other, and the upper concave-convex mirror 42a is supported movably in the vertical direction. Further, the upper and lower mirrors 42
a and 42b are arranged between the optical path conversion mirror 17 and the reading lens 7 which are rotatably supported. An image pickup element 8 is arranged behind the reading lens 7, and the reading lens 7 and the image pickup element 8 are fixed to the apparatus main body (not shown).

Next, the operation will be described. Manuscript 14-2
When reading a three-dimensional image, the optical path conversion mirror 17 is rotated to move the one-dimensional reading range of the document 14. As a result, the optical path length changes, and the amount of change is corrected by moving the upper concave-convex mirror 42a in the vertical direction. For example, as shown in FIG. 15, when the upper concavo-convex mirror 42a composed of three concavities and convexities is moved in the vertical direction by X, the optical path length is 6 times, which is 6 times.
It is corrected by the length of X. Therefore, for example, when the distance between the optical path conversion mirror 17 and the original 14 changes by 60 mm, the optical path length is corrected by moving the upper concave-convex mirror 42a by 10 mm. On the other hand, in the case of the conventional camera-type image reading device shown in FIG. 23, it is necessary to move the reading lens 7 and the image pickup element 8 by 60 mm.

In the case of Example 7, the upper concave-convex mirror 4
Since only 2a needs to be moved, the number of moving parts can be reduced as compared with the conventional camera-type image reading apparatus shown in FIG. 23, and the weight of the moving section can be reduced. Therefore, high-speed movement is possible, and vibration during movement is unlikely to occur.

Further, since the moving distance of the upper concave-convex mirror 42a can be shortened, the moving means can be made compact and the moving accuracy can be easily maintained. The rigidity can be reduced. For example, in the case of the conventional camera-type image reading apparatus shown in FIG. 23, since the moving distance at the time of correcting the optical path length is long, it is difficult to obtain the accuracy of the guide system and the bearing, and a costly member is required. . However, if the moving distance at the time of correcting the optical path length is shortened as in the seventh embodiment, accuracy can be easily obtained,
In addition, it is possible to employ a moving means composed of a low cost member.

As an example of the moving means, FIG. 14 shows a pair of elastic parallel springs 60, a spring fixing member 61 for supporting the upper concave-convex mirror 42a via the springs 60, and a vertical direction for moving the upper mirror 42a by electromagnetic force or the like. The linear motor 62 that drives the optical path conversion mirror 17 and the linear motor 62 that drives the optical path conversion mirror 17 are converted into rotational movement by rotating the vertical movement of the upper concave-convex mirror 42a.

According to this moving means, the upper concave-convex mirror 4
Since 2a is supported by a pair of parallel springs 60, it can be translated in the vertical direction.

In the seventh embodiment, the upper concave-convex mirror 42 is used.
Although a is moved in the vertical direction, the invention is not limited to this, and the lower concave-convex mirror 42b may be moved in the vertical direction.

In the seventh embodiment, the upper and lower concavo-convex mirrors 42a and 42b consisting of three peaks are used.
A number of mountains other than three may be used and can be selected as needed.

In the seventh embodiment, the case where the optical path length of the reading system is corrected has been described. However, the present invention is not limited to this, and the configuration of the seventh embodiment may be used for correcting the optical path length of the illumination system.

Example 8. Next, an eighth embodiment will be described based on FIGS. 16 to 19. 16 to 19, the same members as those of the seventh embodiment are designated by the same reference numerals and the description thereof will be omitted. FIG. 16 is an overall view of Example 8,
As shown in FIG. 16, in the lower concave-convex mirror 42b, the width of one mirror 42c provided facing the reading lens 7 is set to b, and the widths of the other mirrors are set to a. . The width b of the mirror 42c is defined by the angle of view of the reading lens 7. That is, as shown in FIG. 17, the distance between the reading lens 7 and the mirror 42c is c, and the reading lens 7 is
Is 2θ, the width b of the mirror 42c is set to b ≧ c × 2 tan θ. As is clear from the above equation, the width b of the mirror 42c can be reduced as the mirror 42c approaches the reading lens 7. Therefore, since the other mirrors of the lower mirror 42b are located farther from the reading lens 7 than the mirror 42c, the width a of the other mirrors is a.
And the width b of the mirror 40c are a> b.

As a result, a space of (ab) / 2 is formed between the both side portions of the mirror 42c and the other side portions of the other mirrors. The illuminating means 21a is arranged in the space (ab) / 2 on both sides of the mirror 42c. In this case, it is necessary to correct the optical path length of the illumination system corresponding to the optical path length correction of the reading system described in the seventh embodiment. Therefore, as shown in FIGS. 17 and 19, the illumination means 21a is arranged on a surface 51a which is symmetrical to the surface 50 on the optical axis of the reading lens 7 with the mirror 42c as a symmetrical surface. As a result, the light emitted from the illumination means 21a is reflected by the mirror 4
It passes through both sides of 2c and reaches the optical path of the reading system of the upper concave-convex mirror 40a. Therefore, as described in the seventh embodiment, when the upper mirror 42a is moved in the vertical direction to correct the optical path length of the reading system, the optical path length of the illumination system is simultaneously corrected.

By disposing the illuminating means 21a on the surface 51 shown in FIGS. 17 and 19, the illuminating means 21a can be separated from the image pickup element 8. As a result, it is possible to prevent the temperature of the image sensor 8 from rising due to the heat of the illuminating means 21a, so that it is possible to suppress the noise generated in the image sensor 8.

In FIG. 18 and FIG. 19, reference numeral 21 denotes an illuminating means of the conventional camera type image reading apparatus. As shown in these figures, the illuminating means 21 are arranged on both sides of the reading lens 7. Therefore, the image pickup element 8 is affected by the heat of the illumination means 21. However, in the eighth embodiment, the illumination means 21a
Can be disposed at a position away from the reading lens 7, so that it is possible to prevent the reading lens 7 from being adversely affected by the light leaked from the illumination means 21a.

[0072]

As described above, according to the first aspect of the invention, the outer box accommodating the reflecting mirror and the reading lens is arranged on the upper surface of the original, and the light bent by the reflecting mirror passes through the reading lens. The image pickup device, the image pickup device moving means, and the illumination light moving means for forming an image near the supporting column and reading the formed image are arranged substantially linearly on the supporting column supporting the outer box arranged on the upper surface of the original. It is arranged. Therefore, since the constituent members of the camera-type image reading apparatus are arranged so as to be L-shaped as a whole, the number of constituent members on the document surface is reduced. It is easy to support the components on the document surface, and unnecessary vibration does not occur easily. Further, since the other constituent members are arranged substantially linearly along the support column, necessary constituent parts can be stored without enlarging the device.

Further, according to the invention of claim 2, since the reflecting mirror at the rear of the light source of the illuminating means is constituted by a combination of a plurality of cylindrical concave reflecting mirrors having different directions and curvatures, the respective reflecting mirrors are divided. The reflective mirrors are continuously connected to each other, and the combination angle and width are set so that the reflected light irradiates the original surface with the desired width, so the light can be effectively utilized in a limited space. Further, it is possible to easily obtain a more uniform illuminance distribution.

Further, according to the invention of claim 3, the illuminating means has one or two light sources and a rear mirror having a semi-elliptical shape in the rear part of the light source part, and the light source is an ellipse of the rear mirror. Since the light sources are arranged at the two focal points, and the front surface of each light source is provided with a condenser lens for condensing the light on the reading portion, the original can be read without increasing the size of the illumination means. The illuminance distribution on the surface can be easily made uniform, and the illumination efficiency can be improved.

Further, according to the invention of claim 4, since the illuminating means is constituted by a small light source, a hemispherical concave reflecting mirror and a condenser lens in the rear portion, the position of the filament of the light source is formed by reflected light. The virtual image filament is offset from the center of the concave mirror so that the virtual image filament does not overlap with the real image filament and can be located in a substantially continuous position. Therefore, the life of the filament is not shortened, and there is no influence of the shielding of the filament itself, so that efficient light collection can be performed.

Further, according to the fifth aspect of the invention, since the optical path length of a large distance can be corrected with a small movement amount of the concave-convex reflection mirror, the movement amount of the concave-convex reflection mirror can be reduced. Further, it is possible to reduce the size of the device and improve the movement accuracy.

According to the sixth aspect of the invention, the width of the final stage mirror for making the light incident on the reading lens of the concave-convex reflection mirror of the optical path length correction means is set narrower than the width of the preceding stage mirror, and Since the illuminating means is arranged on the plane symmetrical to the optical path plane formed by the image sensor and the optical axis of the reading lens with respect to the final stage mirror, the image is taken while utilizing the optical path correction effect for keeping the illumination distance constant. The influence of the temperature rise of the light source on the element can be reduced.

[Brief description of drawings]

FIG. 1A is an overall view of a camera-type image reading apparatus according to a first embodiment of the present invention, and FIG. 1B is an enlarged view of essential parts thereof.

FIG. 2 is a first embodiment of a camera-type image reading device according to the present invention.
FIG. 4 is a component member layout diagram according to FIG.

FIG. 3 is a second embodiment of the camera-type image reading device according to the present invention.
FIG. 3 is an explanatory view of a lighting means according to FIG.

FIG. 4 is a second embodiment of the camera-type image reading device according to the present invention.
3 is an overall view of a lighting means according to FIG.

FIG. 5 is a second embodiment of the camera-type image reading device according to the present invention.
FIG. 6 is an explanatory view of a reflection state of the illumination means according to FIG.

FIG. 6 is a second embodiment of the camera-type image reading device according to the present invention.
FIG. 6 is an explanatory view of a reflection state of the illumination means according to FIG.

FIG. 7 is a second embodiment of a camera type image reading device according to the present invention.
FIG. 6 is an explanatory view of a reflection state of the illumination means according to FIG.

FIG. 8 is a second embodiment of the camera-type image reading device according to the present invention.
FIG. 6 is an explanatory view of a reflection state of the illumination means according to FIG.

FIG. 9 is a second embodiment of the camera-type image reading device according to the present invention.
FIG. 3 is an explanatory view of the entire reflection state of the illumination means according to FIG.

FIG. 10 is an explanatory diagram of an illumination unit according to a third embodiment of the camera-type image reading device according to the present invention.

FIG. 11 is an explanatory diagram of an illumination unit according to a fourth embodiment of the camera-type image reading device according to the present invention.

FIG. 12 is an explanatory diagram of an illumination unit according to a fifth embodiment of the camera-type image reading device according to the present invention.

FIG. 13 is an explanatory diagram of an illumination unit according to a sixth embodiment of the camera-type image reading device according to the present invention.

FIG. 14 is an overall view of a camera-type image reading device according to a seventh embodiment of the present invention.

FIG. 15 is an explanatory diagram of an operation of the camera-type image reading apparatus according to the seventh embodiment of the present invention.

FIG. 16 is an overall view of a camera-type image reading device according to an embodiment 8 of the present invention.

FIG. 17 is an enlarged view of a main part according to the eighth embodiment of the camera-type image reading device according to the present invention.

FIG. 18 is an enlarged view of a main part according to the eighth embodiment of the camera-type image reading device according to the present invention.

FIG. 19 is an enlarged view of a main part according to the eighth embodiment of the camera-type image reading device according to the present invention.

FIG. 20 is an overall view of a conventional camera-type image reading device.

FIG. 21 is a layout view of constituent members of a conventional camera-type image reading apparatus.

FIG. 22 is an explanatory diagram of an illumination unit of a conventional camera-type image reading device.

FIG. 23 is an overall view of another example of a conventional camera-type image reading device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 light source 2, 5, 30 concave reflection mirror 3 condensing lens 7 reading lens 8 one-dimensional image pickup device 9, 19 image pickup device moving means 11 outer box 13 support 14 manuscript 20 reflection mirrors 21a, 22, 22a, 22b illumination means 23 illumination Light moving means 42a, 42b Concavo-convex reflection mirror

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[Procedure amendment]

[Submission date] February 24, 1993

[Procedure Amendment 1]

[Document name to be amended] Statement

[Name of item to be corrected] Claim 1

[Correction method] Change

[Correction content]

[Procedure Amendment 2]

[Document name to be amended] Statement

[Name of item to be corrected] Claim 4

[Correction method] Change

[Correction content]

[Procedure 3]

[Document name to be amended] Statement

[Name of item to be corrected] Claim 5

[Correction method] Change

[Correction content]

[Procedure amendment 4]

[Document name to be amended] Statement

[Name of item to be corrected] Claim 6

[Correction method] Change

[Correction content]

[Procedure Amendment 5]

[Document name to be amended] Statement

[Correction target item name] 0009

[Correction method] Change

[Correction content]

[0009]

[Problems that the Invention is to Solve In a conventional camera-type image reading apparatus shown in FIG. 20 for example, as described above apparatus, supporting
A camera-type image is attached to the head portion 12 supported on the upper end of the pillar 13.
Many major components of the image reader are installed
Therefore, the head portion 12 becomes large and vibration is likely to occur when the document 14 is read. In order to suppress the occurrence of vibration, it is necessary to give the column 13 supporting the head portion 12 sufficient strength, which causes a problem that the camera-type image reading apparatus becomes large.

Claims (6)

[Claims] 1. An outer box provided on a column and arranged above a document, an illuminating means for irradiating linearly condensed light to a one-dimensional reading range of the document, and a one-dimensional reading range of the document. A reflection mirror for refracting the reflected linearly condensed light; a reading lens for receiving the light refracted by the reflection mirror to optically form an image of a one-dimensional reading range of an original; In order to receive a two-dimensional image of a document with the one-dimensional image sensor, which receives the image optically formed by the reading lens on the imaging surface and reads the image of the one-dimensional reading range of the document, An image pickup device moving means for moving the one-dimensional image pickup device in a vertical direction along a column to move a one-dimensional reading range of a document incident on an image pickup surface of the one-dimensional image pickup device in a two-dimensional direction of the document; Focused linearly on the one-dimensional reading range of the original In a camera-type image reading apparatus including an illumination light moving unit that moves light in correspondence with movement of a one-dimensional reading range of a document moving in the two-dimensional direction, the reflection mirror and the reading lens are housed in an outer box. Further, a camera type image reading device characterized in that the illumination means, the image pickup device, the image pickup device moving means and the illumination light moving means are housed in a support. 2. An illuminating means for irradiating light linearly condensed in a one-dimensional reading range of a document, and a reflection mirror for refracting the linearly condensed light reflected in the one-dimensional reading range of the document. , A reading lens that receives the light refracted by the reflection mirror to optically form an image in the one-dimensional reading range of the document, and an image that is optically formed by the reading lens on the imaging surface. A one-dimensional image sensor for reading an image of a one-dimensional reading range of a document, and an image pickup surface of the one-dimensional image sensor for moving the one-dimensional image sensor to read a two-dimensional image of a document with the one-dimensional image sensor The image pickup device moving means for moving the one-dimensional reading range of the original incident on the document in the two-dimensional direction of the original, and the light linearly condensed in the one-dimensional reading range of the original,
In a camera-type image reading apparatus provided with an illumination light moving unit that moves in response to a movement of a one-dimensional reading range of a document moving in the dimension direction, the illumination unit is divided into a plurality of light sources each having a small light emitting unit. The elliptic cylinder concave reflection mirror having different angles and curvatures, the reflecting surfaces of each of the divided elliptic cylinder concave reflection mirrors are continuously connected, and the reflected light of each elliptic cylinder concave reflection mirror is desired. A camera-type image reading device characterized in that the angle and width of each of the elliptic cylinder concave reflecting mirrors are set so as to collect light on the original with the width. 3. An illuminating means for irradiating the one-dimensional reading range of the original with linearly condensed light, and a reflecting mirror for refracting the linearly condensed light reflected in the one-dimensional reading range of the original. A reading lens that receives the light refracted by the reflection mirror to optically form an image in the one-dimensional reading range of the original, and an image that is optically formed by the reading lens on the imaging surface. A one-dimensional image sensor for reading an image in the one-dimensional reading range of the document, and moving the one-dimensional image sensor to read the two-dimensional image of the document with the one-dimensional image sensor. The image pickup device moving means for moving the one-dimensional reading range of the original incident on the surface in the two-dimensional direction of the original, and the light linearly condensed in the one-dimensional reading range of the original
In a camera-type image reading apparatus including an illumination light moving unit that moves in response to a movement of a one-dimensional reading range of a document that moves in a dimension, the illumination unit includes one or two light sources of small light emitting units, A semi-elliptical reflection mirror is provided behind the light source, the light source is arranged at two focal points or one of the focal points of the semi-elliptical reflection mirror, and a condenser lens is provided in front of the light source. A camera-type image reading device characterized by being provided. 4. An illuminating means for irradiating the one-dimensional reading range of the original with linearly condensed light, and a reflecting mirror for refracting the linearly condensed light reflected in the one-dimensional reading range of the original. A reading lens that receives the light refracted by the reflection mirror to optically form an image in the one-dimensional reading range of the original, and an image that is optically formed by the reading lens on the imaging surface. A one-dimensional image sensor for reading an image in the one-dimensional reading range of the document, and moving the one-dimensional image sensor to read the two-dimensional image of the document with the one-dimensional image sensor. The image pickup device moving means for moving the one-dimensional reading range of the original incident on the surface in the two-dimensional direction of the original, and the light linearly condensed in the one-dimensional reading range of the original
In a camera-type image reading apparatus provided with an illumination light moving unit that moves in response to a movement of a one-dimensional reading range of a document moving in a dimension, the illumination unit has a light source of a small light emitting unit and a hemispherical rear concave surface. The rear concave surface is composed of a reflecting mirror and a condenser lens, and the virtual image filament formed by the light reflected from the rear concave reflecting mirror at the position of the light source filament is arranged at a position continuous with the filament. A camera-type image reading device characterized by being displaced from the center of a reflecting mirror. 5. Illumination means for irradiating linearly condensed light to a one-dimensional reading range of an original, and illumination that is rotatably or movably supported and is reflected in the one-dimensional reading range of the original. A reflecting mirror that reflects the light projected from the means and guides it in a desired direction, and a reading that optically forms an image within the one-dimensional reading range of the document by receiving the light guided by the reflecting mirror. A lens, a one-dimensional image pickup device for reading an image within the one-dimensional read range of the document optically formed by the reading lens, and the reflection mirror for reading a two-dimensional image of the document by the one-dimensional image pickup device By rotating or moving the
Dimensional reading range Reflecting mirror moving means for moving the original in the two-dimensional direction, and an optical path between the one-dimensional reading range of the original and the reading lens that changes based on movement of the one-dimensional reading range of the original in the two-dimensional direction. In a camera-type image reading apparatus provided with an optical path length correcting means for correcting the length to a fixed length, the optical path length correcting means is a pair of concave-convex reflecting mirrors 42a, 42b formed with a plurality of right-angle concave-convex reflecting surfaces. Have
The pair of concave-convex reflecting mirrors are arranged such that their reflecting surfaces face each other in parallel, and the light reflected in the one-dimensional reading range of the original document is alternately reflected by one concave-convex reflecting mirror and the other concave-convex reflecting mirror. In addition to guiding the light to the reading lens, the distance between the pair of concave and convex reflecting mirrors is changed in response to the rotation or movement of the reflecting mirror, so that the optical path length between the one-dimensional reading range of the original and the reading lens becomes constant. A camera-type image reading device characterized in that 6. Illumination means for irradiating linearly condensed light to a one-dimensional reading range of an original, and illumination that is rotatably or movably supported and is reflected in the one-dimensional reading range of the original. A reflecting mirror that reflects the light projected from the means and guides it in a desired direction, and a reading that optically forms an image within the one-dimensional reading range of the document by receiving the light guided by the reflecting mirror. A lens, a one-dimensional image pickup device for reading an image within the one-dimensional read range of the document optically formed by the reading lens, and the reflection mirror for reading a two-dimensional image of the document by the one-dimensional image pickup device By rotating or moving the
Between the reflection lens moving means for moving the two-dimensional direction of the original in the two-dimensional direction of the original, and the one-dimensional reading range of the original and the reading lens which change based on the movement of the one-dimensional reading range of the original in the two-dimensional direction. In order to correct the optical path length to a fixed length, a pair of concave-convex reflecting mirrors having a plurality of right-angled concave-convex reflecting surfaces are arranged so that their reflecting surfaces are opposed to each other in parallel, and the original is one-dimensionally read. The light reflected in the range is alternately reflected by one and the other of the pair of concave-convex reflecting mirrors and guided to the reading lens, and the interval between the pair of concave-convex reflecting mirrors is changed in accordance with the rotation or movement of the reflecting mirrors. In a camera-type image reading device including an optical path length correction unit,
The width dimension of the reflecting surface of the concave-convex reflecting mirror arranged facing the reading lens is set smaller than the width dimension of the other reflecting surface of the concave-convex reflecting mirror, and the width dimension of the reflecting surface facing the reading lens is set. The optical axis of the reading lens and the image pickup surface of the one-dimensional image pickup device, which are both sides of the reflecting surface of the concave-convex reflecting mirror, and have the reflecting surface of the concave-convex reflecting mirror arranged facing the reading lens as a symmetrical surface. A camera-type image, characterized in that the illuminating means is provided on a surface symmetrical to the optical path surface formed by, and the light projected from the illuminating means is matched with the optical path of the light guided to the reading lens. Reader.