JPH08149366A - Image input device - Google Patents

Abstract

(57) [Abstract] [Purpose] Regarding an image input device, focusing can be performed by a particularly simple structure. A document holder 21, a lighting unit 41, an image forming unit having first and second image forming units 92 and 102 having different magnifications, an image reading unit having first and second sensors 93 and 103, and an original 20 are provided. The first optical path 90 and the second image forming means 102 for making the reflected light / transmitted light incident on the first image forming means 92 incident on the first image forming means 92.
Optical path switching means 80 for switching to the second optical path 100 to be incident on the optical path, and driving means 12 for driving the optical path switching means 80.
0, and an optical system holder 61 accommodating the image forming means, the image reading means, and the optical path switching means 80, and the driving means 120 is one of the original document holder 21 and the optical system holder 61. Focusing is done by moving to the other.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an image input apparatus for reading transparent originals or non-transparent originals of different sizes, and has a particularly simple structure for focusing.

[0002]

2. Description of the Related Art Conventionally, as an example of this type of image input apparatus, a so-called 35 mm size slide film scanner is shown in FIGS. FIG. 5 is a schematic horizontal sectional view of a conventional image input device, and FIG. 6 is an external perspective view of the conventional image input device.

In FIGS. 5 and 6, reference numeral 200 denotes a conventional image input device, and this image input device 200 is, as shown in FIG.
A slide holder 211 for holding the slide film 210 is provided in the center thereof. A light source 220 that illuminates the slide film 210 held by the slide holder 211 is arranged on the right side of the slide holder 211 in FIG.

Illumination light from a light source 220 having a concave mirror 220a is applied to a slide film 210 via a filter group 221 and a lens group 222. Also, slide holder 211
5, the reflection mirror 223 is arranged on the left side. The transmitted light that has passed through the slide film 210 is imaged on the CCD 225, which is a line-type image sensor, by the imaging lens 224 after the optical axis is bent at a right angle through the reflection mirror 223.

In this manner, the image on the slide film 210 is read by the CCD 225, and the photoelectrically converted image signal is output from the image input device 200 to an image processing unit (not shown) such as an external computer. As shown in FIG. 5, the slide holder 211 is slidably held by two guide rails 213 via a stage 212, and is moved in the sub scanning direction by a film scanning mechanism 230.

The film scanning mechanism 230, as shown in FIG. 5, is roughly classified into a stage motor 231 and a motor 2 thereof.
The scanning lead screw 232 rotates by 31. The scanning lead screw 232 is screwed into the screw cylinder 214 of the stage 212, as shown in FIG.

Therefore, as the stage motor 231 rotates, the stage 212 slides along the guide rail 213, and the slide holder 211 moves in the sub-scanning direction. Further, the imaging lens 224 and the CCD 225 are held at a constant interval by an optical system support member 226, as shown in FIG.

The optical system support member 226 is moved in the optical axis direction by the focusing mechanism 240, as shown in FIG. As shown in FIG. 5, the focusing mechanism 240 includes a focus adjusting motor 241 and a focus adjusting lead screw 242 rotated by the motor 241. The focus adjusting lead screw 242 is screwed into the screw cylinder 227 of the optical system supporting member 226, as shown in FIG.

Therefore, when the focus adjusting motor 241 rotates, the optical system supporting member 226 moves in parallel with the optical axis, and the distance between the imaging lens 224 and the slide film 210 held by the slide holder 211 is increased. Change. And
An image processing unit (not shown) such as a computer connected to the image input apparatus 200 drives the focusing mechanism 240 in addition to image input processing, and calculates the contrast of the image based on the input image signal. However, the focusing operation is automatically performed.

In FIG. 6, reference numeral 250 denotes a case, and a recess 251 is formed at the center of the case 250.
251 constitutes a movement space of the slide holder 211. Further, as shown in FIGS. 5 and 6, an air intake hole 252 is provided on the side surface of the case 250, and an exhaust fan 253 is provided inside the case 250 so that the light source 220 inside the case 250 and Power supply 2
The heat generated from 54 etc. is exhausted to the outside of case 250.

[0011]

However, in the above-mentioned conventional image input apparatus 200, since the magnification of the imaging lens 224 is fixed for a so-called 35 mm size slide film, if the size of the film original differs, The first problem is that it cannot be used. Eg 4
When used for inch x 5 inch film originals,
Only part of it can be read.

On the contrary, if the magnification of the imaging lens 224 is fixed according to the film original of 4 inch × 5 inch size, conversely, when the film original of so-called 35 mm size is used, of all the pixels of the CCD 225. Since only a part of it is used, sufficient image quality cannot be obtained. Therefore, a plurality of image input devices 200 are required according to the size of the film original.

On the other hand, the magnification of the imaging lens 224 may be variable, but if this is done, the imaging lenses 224 and C
The distance to CD225 must also change. For this reason, if the magnification of the imaging lens 224 is configured to be variable, the focusing and the magnification adjustment have to be performed individually, which complicates the mechanism and increases the size of the apparatus. May occur.

Therefore, the invention according to claim 1 is made in view of the first and second problems of the above-mentioned conventional technique, and its purpose is to cope with originals of different sizes. Not only can it be done, but size switching and focusing can be driven by a common drive means, and at the same time,
An object of the present invention is to provide an image input device that can focus by a simple structure and can be downsized by moving the entire document holder or the optical system holder.

The invention according to claim 2 is the above-mentioned claim 1.
In addition to the object of the invention described above, it is an object of the present invention to provide an image input device that facilitates focusing by enabling simultaneous focusing of documents of different sizes. According to a third aspect of the present invention, in addition to the above-described object of the first or second aspect of the invention, a fixed magnification is used, so that an appropriate magnification can be set according to the size of the document. Is to provide.

The invention according to claim 4 is the above-mentioned claim 1.
(3) In addition to the objects of the inventions described in (3) to (3), by using a reflection mirror for size switching, an image input device capable of further simplifying the structure of the optical path switching means and further downsizing is provided. Is.

[0017]

The present invention is to achieve the above-mentioned object, and the contents thereof will be described below with reference to the embodiments shown in the drawings. The invention according to claim 1 is characterized by having the following eight configurations as shown in FIGS.

The first is a document holder (21), which holds a document (for example, a film document 20) as shown in FIG. 1, for example. Second
Is an illuminating means (for example, a light source 41), and the illuminating means (for example, a light source 41) is for illuminating the original document (for example, the film original document 20) held by the original document holder (21) as shown in FIG. It illuminates an image.

The third is an image forming means (for example, first and second image forming lenses 92 and 102).
The second imaging lenses 92, 102), for example, as shown in FIGS. 1 and 3, transmit reflected light / transmitted light that enters through the document (for example, the film document 20) illuminated by the illumination means (for example, the light source 41). An image is formed by the first and second image forming means (for example, the first and second image forming lenses 92 and 102) having different magnifications.

Fourth, image reading means (for example, first,
The second sensor 93, 103), and this image reading means (for example, the first and second sensors 93, 103) is, for example, as shown in FIGS.
, The first and second imaging means (for example, the first,
It is provided with first and second sensors (93, 103) for reading the images formed by the second image forming lenses 92, 102, respectively. Fifth
Is an optical path switching means (80).
(80) is, for example, as shown in FIGS. 1 and 3, in the optical path from the document (for example, film document 20) to the first and second image forming means (for example, first and second image forming lenses 92 and 102). To position.

In addition to this, the optical path switching means (80) is
For example, as shown in FIG. 1, the reflected light / transmitted light that enters through the document (for example, the film document 20) is incident on the first image forming unit (for example, the first image forming lens 92) as a first optical path ( 90) and, for example, as shown in FIG. 3, the second optical path (10) to be incident on the second image forming means (for example, the second image forming lens 102).
It switches to 0) and.

Sixth, drive means (eg step motor)
120), the drive means (eg step motor 1
20) is for driving the optical path switching means (80) as shown in FIGS. The seventh is an optical system holder (61), and the optical system holder (61) includes the image forming means (for example, the first and second image forming lenses 92 and 102) and the image reading means (for example, the first and second image forming means). 2 sensors 93, 103) and the optical path switching means (80).

Eighth, the driving means (for example, step motor 120), as shown in, for example, FIG. 1 or 4, uses one of the original holder (21) and the optical system holder (61) for the other. Focusing is performed by moving the lens with respect to. The invention described in claim 2 is characterized in that it has the following structure in addition to the structure of the invention described in claim 1.

That is, the range of the depth of focus of one of the first and second image forming means (for example, the first and second image forming lenses 92 and 102) is included in the range of the depth of focus of the other. The invention described in claim 3 is characterized in that it has the following structure in addition to the structure of the invention described in claim 1 or claim 2. That is, in the optical system holder (61), the first and second image forming means (for example, the first and second image forming lenses 92 and 102) and the first and second sensors forming a pair, respectively.
The distances from (93, 103) are kept constant.

The invention according to claim 4 is the above-mentioned claim 1.
In addition to the configurations of the inventions described in 1 to 3, the following features are provided. That is, the switching means (80)
Is a reflection mirror (for example, the first and second reflection mirrors 81 and 82)
It consists of

[0026]

Therefore, the invention according to claim 1 has the following effects. That is, by driving the driving unit (eg, step motor 120), reflected light / transmitted light incident through the document (eg, film document 20) is converted into the first image as shown in FIG. Means (eg, first imaging lens 92) to enter the first optical path (90) and, for example, as shown in FIG.
It can be switched to the second optical path (100) which is made incident on the imaging lens 102).

Further, by driving the driving means (for example, step motor 120), as shown in FIG. 1 or 4, for example, the document holder (21) and the optical system holder are shown.
Focusing can be performed by moving either one of (61) and the other. For example, as shown in FIG. 1, when the optical system holder (61) is moved, a document (eg, a film document) held by the document holder (21) is moved.
Focusing becomes possible by changing the distance of the first and second image forming means (for example, the first and second image forming lenses 92, 102) with respect to 20).

On the contrary, as shown in FIG. 4, for example, when the document holder (21) is moved, the document holder for the first and second image forming means (for example, the first and second image forming lenses 92, 102) ( By changing the distance of the document held in (21),
Focusing becomes possible. The invention described in claim 2 has the following operation in addition to the operation of the invention described in claim 1.

That is, since the range of the depth of focus of one of the first and second image forming means (for example, the first and second image forming lenses 92 and 102) is included in the range of the depth of focus of the other, the depth of focus is By performing focusing on one of the shallow (narrow) positions, it is possible to perform focusing on the other of the deep (wide) focal depth at the same time. The invention described in claim 3 has the following operation in addition to the operation of the invention described in claim 1 or claim 2.

That is, the first and second image forming means (for example, the first and second image forming lenses 92 and 102) have a fixed magnification, and the original (for example, the film original 20) and the optical system holder (61). By changing the respective distances, it becomes possible to focus only without changing the magnification. The invention described in claim 4 has the following operation in addition to the operation of the invention described in claims 1 to 3.

That is, a reflection mirror (for example, the first and second mirrors)
The reflection mirrors 81, 82) can switch the first optical path (90) and the second optical path (100) as shown in FIGS.

[0032]

1 to 3 show a first embodiment of the present invention. FIG. 1 is a schematic vertical sectional view of an image input device, FIG. 2 is an external perspective view of the image input device, and FIG. The schematic expanded vertical sectional view of a system holder is shown, respectively. In FIG. 2, reference numeral 10 denotes an image input device. The image input device 10 reads an image of, for example, a film original 20 as an original, and an image is read by an image processing unit (not shown) such as an external computer. It is used as a scanner that outputs signals.

As the film original 20, two types of different sizes, for example, so-called 35 mm size and 4 inches ×
The 5 inch size is selected. The size of the film original 20 is so-called 35 mm size and 4 inches x 5
Not limited to inch size, other sizes such as 6 cm x 6 cm or 6 cm
It may be a size of 7 cm, 6 cm or 9 cm.

Further, the original may be, for example, a transparent original such as a film original 20 or a negative film, or a non-transparent original such as a printed print, poster, book, or magazine. As shown in FIG. 2, the film original 20 is horizontally held in the original holder 21 in this embodiment through a horizontally long insertion opening 31 at the center of the front of the case 30 of the image input apparatus 10. Is inserted in the direction.

As shown in FIG. 2, the original document holder 21 is, for example, in the form of a frame and holds the non-image surface around the image surface of the film original document 20.
An opening 22 is formed which faces the image surface of 20. The document holder 21 may be replaced with what is called a slide mount, or may be one capable of holding the unmounted film document 20. Also, the document holder 21 may be prepared in two sizes, a so-called 35 mm size and a 4 inch × 5 inch size, or for example, the larger 4 inch × 5 size.
The opening 22 may be masked when the film is designed for the inch-sized film original 20 and a small size of 35 mm is used. Further, the film original 20 may be a series of images of a plurality of frames, or may be cut for each frame.

As shown in FIG. 1, the inside of the case 30 is divided into three layers in the vertical direction centering on the insertion port 31. First, in the upper layer of the case 30, as shown in FIG.
A document illumination unit 40 that illuminates the film document 20 is arranged. Next, in the intermediate layer in the case 30, that is, below the document illumination section 40, a document scanning section for scanning the film document 20 is provided.
50 are arranged. Further, a document reading unit 60 that reads an image of the film document 20 is arranged in a lower layer of the case 30, that is, below the document scanning unit 50. The document reading unit 60 is arranged in the front half of the front side of the case 30 having the insertion port 31, and the power supply unit 70 is arranged in the latter half.

First, the document illumination section 40 will be described with reference to FIG. As shown in FIG. 1, the original illuminating section 40 is a light source 41 as an illuminating means for illuminating the film original 20.
And various filters 42 to 44 arranged in the space between the light source 41 and the film original 20, illumination lenses 45 and 46, and illumination mirrors 47 to 49. The light source 41 is shown in FIG.
As shown in, it is composed of, for example, a halogen lamp having a concave mirror 41a.

As shown in FIG. 1, the filters 42 to 44 include a heat ray absorbing filter 42 and a diffusion plate 43 from the light source 41 side.
And a color filter 44 is arranged. The heat ray absorption filter 42 absorbs heat ray components from the halogen lamp. The diffusion plate 43 forms a uniform light source surface without unevenness. As the color filter 44, three color filters of red, green and blue are used, and the same image is read alternately for each color,
Color images can be input.

The number of filters 42 to 44 is not limited to three. For example, in the case of monochrome, the color filter 44 may be omitted, or more than three filters may be arranged. As shown in FIG. 1, the lenses 45 and 46 are composed of a first illumination lens 45 and a second illumination lens 46 from the light source 41 side. A Fresnel lens, for example, is used as the first illumination lens 45.

As the second illumination lens 46, as shown in FIG. 1, a plurality of, for example, two Fresnel lenses are used. The illumination light emitted from the light source is focused behind the film original 20 by the first and second illumination lenses 45 and 46. Although Fresnel lenses are used as the illumination lenses 45 and 46, they are not limited to Fresnel lenses and ordinary lenses may be used. Further, the first and second illumination lenses 45 and 46 are used as the illumination lenses 45 and 46, but the number of the illumination lenses 45 and 46 is not limited to two, and one set or three or more sets are arranged. You may. Further, although one lens is used for the first illumination lens 45 and two lenses are used for the second illumination lens 46, the number of lenses is not limited to that of the embodiment.

As shown in FIG. 1, the illuminating mirrors 47 to 49 are arranged between a first illuminating lens 45 and a second illuminating lens 46, for example, three first to first illuminating lenses. It is composed of three illumination mirrors 47 to 49. As shown in FIG. 1, each of the first to third illumination mirrors 47 to 49 bends the optical axis of the illumination light emitted from the light source 41 in a direction perpendicular to each other.

That is, the light source 41, as shown in FIG.
A light source 41 arranged on the back side of the case 30 and provided with a concave mirror 41a
The illuminating light emitted from the light travels horizontally toward the front of the case 30. The illumination light traveling in the horizontal direction is the first illumination mirror.
Reflected by 47, its optical axis is bent vertically downward. Thereafter, the illumination light reflected by the first illuminating mirror 47 is horizontally folded toward the back of the case 30 by the second illuminating mirror 48, and further vertically downward by the third illuminating mirror 49. It is incident vertically on the horizontal film surface of the document 20.

As described above, since the optical path of the illumination light is folded by the three illuminating mirrors 47 to 49, and the optical path is arranged parallel to the film surface of the film original 20, the original illuminating section 40 is placed above and below. There is an advantage that the thickness in the direction can be reduced. The number of illumination mirrors 47 to 49 is not limited to three,
More may be provided.

Next, the document scanning section 50 will be described with reference to FIG. As shown in FIG. 1, the document scanning unit 50 includes a document holder 21 inserted from an insertion port 31 of a case 30.
The stage 51 for holding the film original 20 parallel to the image surface of the film original 20, that is, horizontally.
It is composed of a document scanning unit 52 which slides in parallel to the image plane of 20, that is, in the horizontal direction.

As shown in FIG. 1, the document scanning means 52 includes a stage motor 53 fixed in the case 30 and a scanning lead screw 54 rotated by the stage motor 53.
And this scanning lead screw 54 is screwed in, the stage
It is composed of a screw cylinder 55 provided on the 51 and a guide member (not shown) passed over the front and back. Therefore, when the stage motor 53 is driven, the scanning lead screw 54 rotates, and since the scanning lead screw 54 is screwed into the screw cylinder 55 of the stage 51, the stage 51 moves horizontally.

Although the rotational force of the stage motor 53 is converted into a linear motion by the scanning lead screw 54 and the screw cylinder 55 into which the scanning lead screw 54 is screwed, another link mechanism or cam mechanism is used. You may. Next, the document reading section
The 60 will be described mainly with reference to FIGS. The document reading unit 60 is housed in an optical system holder 61 fixed in the case 30, as shown in FIG.

As shown in FIGS. 1 and 3, the optical system holder 61 forms a so-called dark box having a hollow box shape, and the incident light on the upper surface of which the transmitted light after passing through the film original 20 is incident. A window 62 is formed. As shown in FIG. 3, in the optical system holder 61, when roughly divided, the optical axes of the transmitted light vertically incident from above through the entrance window 62 are bent in two horizontal directions, and the first optical path 90 (see FIG. Optical path switching means 80 for switching between the second optical path 100 (see FIG. 3) and the second optical path 100 (see FIG. 3), and the first and second optical systems 91 and 101 arranged in the first and second optical paths 90 and 100 and having different magnifications. Is equipped with.

As shown in FIGS. 1 and 3, the optical path switching means 80 is composed of two first and second reflecting mirrors 81 and 82. As shown in FIG. 1, the first reflection mirror 81 is fixed to the lower side of the optical system holder 61, and the transmitted light vertically incident from above through the entrance window 62 is perpendicular to the optical axis of the case 30. It is bent toward the front with the insertion port 31.

As shown in FIGS. 1 and 3, the second reflection mirror 82 is arranged between the entrance window 62 and the first reflection mirror 81, and one end thereof is attached to the optical system holder 61 by a rotation shaft 83. It is supported and swivels around the rotation axis 83 to appear in and out of the optical path of the transmitted light incident from the entrance window 62. The first optical system 91
As shown in FIGS. 1 and 3, is a first image forming means for forming an image of the transmitted light reflected by the first reflecting mirror 81.
An image forming lens 92 and a first sensor 93 which constitutes an image reading means for reading an image formed by the first image forming lens 92 are provided.

As shown in FIG. 3, the second optical system 101 forms an image of the transmitted light reflected by the second reflecting mirror 82, and has a second magnification which is larger than that of the first imaging lens 92. A second imaging lens 102 as a means and a second sensor 103 which constitutes an image reading means for reading an image formed by the second imaging lens 102 are provided. The first and second sensors 93, 103 constituting the image reading means,
For example, a CCD type line sensor is used.

Therefore, in the first optical system 91, since the magnification of the first imaging lens 92 is smaller than that of the second imaging lens 102,
It is used for film originals 20 of 4 inch x 5 inch size. On the other hand, the second optical system 101 is used for a so-called 35 mm size film original 20 because the magnification of the second imaging lens 102 is larger than that of the first imaging lens 92. Further, one of the first and second imaging lenses 92 and 102, for example, the range of the depth of focus of the second imaging lens 102 is set to be included in the other, for example, the range of the depth of focus of the first imaging lens 92.

In this way, by including the range of the depth of focus of the second imaging lens 102 in the range of the depth of focus of the first imaging lens 92, the second optical system having a shallow (narrow) depth of focus is provided.
By performing the focusing of 101, the focusing of the first optical system 91 having the deep (wide) focal depth can be performed at the same time, and the focusing of both the first and second optical systems 91 and 101 can be performed at the same time. There are advantages.

The range of the depth of focus of the first and second imaging lenses 92 and 102 may be changed, and the focusing of both the first and second optical systems 91 and 101 may be performed separately. As shown in FIG. 3, the first and second optical systems 91 and 101 are respectively held by an optical system holding member 110 fixed in an optical system holder 61. As shown in FIG. 3, the optical system holding member 110 has first and second surfaces 111 and 112 which are vertically opposed to each other. And
The first surface 111 of the optical system holding member 110 facing downward has the first
The image forming lens 92 and the first sensor 93 are fixed while being kept at a constant distance. Further, the second surface 112 of the optical system holding member 110 facing upward is fixed while keeping the distance between the second imaging lens 102 and the second sensor 103 constant.

Therefore, since the distances between the first and second imaging lenses 92 and 102 and the first and second sensors 93 and 103 are fixed, the magnifications of the first and second optical systems 91 and 101 are also fixed. ing. In addition, below the optical system holder 61, FIG.
As shown in, a step motor 120 as a driving means is arranged.

The step motor 120 is fixed in the case 30, as shown in FIG. As shown in FIG. 3, a switching lever 130 is arranged between the step motor 120 and the second reflecting mirror 82. The second reflection mirror 82 is connected to the upper end of the switching lever 130.

An output gear 140 is attached to the output shaft of the step motor 120 as shown in FIG. An optical system moving lead screw 141 as a focusing transmission means and an optical path switching lead screw 142 as an optical path switching transmission means are arranged on the front and rear of the output gear 140, that is, on the left and right sides in FIG. .

The upper end of the optical system moving lead screw 141 is integrally fixed to the bottom of the optical system holder 61, as shown in FIG. And the optical system moving lead screw 14
1 is arranged parallel to, or perpendicular to, the optical axis of the transmitted light that is incident from above through the incident window 62. In addition, as shown in FIG. 3, the output gear 1 is attached to the optical system moving lead screw 141.
The screw cylinder integrated with the gear meshing with 40 is fitted.

Therefore, when the output gear 140 is rotated by the driving force of the step motor 120, the screw cylinder integrated with the gear meshing with the output gear 140 is rotated. When the screw cylinder rotates, the optical system moving lead screw 141 fitted in the screw cylinder moves up and down relatively. Therefore, the optical system moving lead screw 141
The optical system holder 61, to which is integrally fixed, moves up and down as a whole. When the optical system holder 61 moves up and down as a whole, the distance between the first and second image forming lenses 92 and 102 with respect to the film original document 20 held by the original document holder 21 changes, thereby enabling focusing.

On the other hand, the optical path switching lead screw 142 is
As shown in FIG. 3, an integral gear that meshes with the output gear 140 is provided. Therefore, the output gear 140 includes a gear integrated with the screw cylinder and an optical path switching lead screw.
142 and the integral gear mesh at the same time. And
As shown in FIG. 3, a screw cylinder formed at the lower end of the switching lever 130 is fitted to the optical path switching lead screw 142.

Therefore, when the output gear 140 is rotated by the driving force of the step motor 120, the optical path switching lead screw 142 integrated with the gear meshing with the output gear 140 is rotated. When the optical path switching lead screw 142 rotates, the switching lever 130 integrated with the screw cylinder that meshes with the optical path switching lead screw 142 relatively moves up and down. When the switching lever 130 moves up and down, the second reflecting mirror 82 connected to the upper end of the switching lever 130 swivels around its rotation axis 83 as shown in FIGS. It appears in and out of the optical path, and the first and second optical paths 90, 100 are switched.

The step motor 120 is used as a driving means.
However, other DC / AC motors may be used. Further, the rotational force of the step motor 120 is converted into linear motion by the optical system moving lead screw 141 and the optical path switching lead screw 142, but other link mechanism or cam mechanism may be used. Furthermore, the output gear 1 of the step motor 120
A clutch mechanism may be provided between the 40 and the two lead screws 141, 142 to selectively drive the two lead screws 141, 142.

On the other hand, on the left and right side surfaces of the case 30, as shown in FIG. 2, a pair of left and right air intake holes 32, 32 are provided. Further, an exhaust fan 33 is provided inside the case 30 on the back side of the light source 41, and heat generated from the light source 41 in the case 30, the power supply unit 70, etc. is exhausted to the outside of the case 30. Next,
A procedure for using the image input device 10 having the above configuration will be described.

For example, in the case of a film original 20 having a size of 4 inches × 5 inches, as shown by the solid line in FIG. 1, the step motor 120 is driven and the optical path switching means 80 switches to the first optical path 90. Therefore, the light transmitted through the film original 20 is reflected by the first reflection mirror as shown by the two-dot chain line in FIG.
After being reflected by 81, an image is formed on the first sensor 93 via the first imaging lens 92, and the image of one line is read.

Then, while moving the optical system holder 61 up and down, the difference in the contrast of the read image is used to
The optical system holder 61 is stopped at the optimum focus position. After focusing, the film original 20 is moved in the sub-scanning direction via the original scanning means 52, so that the image of the film original 20 is two-dimensionally read. On the other hand, in the case of the so-called 35 mm size, as shown in FIG.
Is driven to switch to the second optical path 100 by the optical path switching means 80.

Therefore, the light transmitted through the film original 20 is reflected by the second reflecting mirror 82, as shown by the chain double-dashed line in FIG. An image of one line is read. Then, while moving the optical system holder 61 up and down, the optical system holder 61 is stopped at the optimum focus position by utilizing the contrast difference of the read image.

On the other hand, when the film original 20 of, for example, 4 inches × 5 inches is used again, the first optical system is used.
Since 91 has a deeper (wider) focal depth than the second optical system 101, it is possible to omit focusing of the first optical system 91. Next, FIG. 4 shows a second embodiment of the present invention, which is a schematic vertical sectional view of the image input device.

The feature of the second embodiment is that the first embodiment described above is used.
Instead of moving the optical system holder 61 as shown in the embodiment, as shown in FIG.
The point is that focusing is performed by moving the optical system holder 61. That is, the scanning lead screw 54
On the lower side, as shown in FIG. 4, a step motor 120 as driving means is arranged.

The step motor 120 and the second reflecting mirror 8
As shown in FIG. 4, a switching lever 131 is arranged between the two. A second reflection mirror 82 is connected to the front end of the switching lever 131, that is, the left end in FIG. An output gear 150 is attached to the output shaft of the step motor 120 as shown in FIG.

A document moving lead screw 151 as a focusing transmission means and an optical path switching lead screw 152 as an optical path switching transmission means are arranged on the front and rear of the output gear 150, that is, on the left and right sides in FIG. Has been done. As shown in FIG. 4, the upper end of the document moving lead screw 151 is integrally fixed to the stage 51 holding the document holder 21 via a stage motor 53, a scanning lead screw 54 and a screw cylinder 55. ing. Then, the document moving lead screw 151 is arranged parallel to, ie, perpendicular to, the optical axis of the transmitted light incident from above through the entrance window 62.

Further, as shown in FIG. 4, a screw cylinder integral with a gear meshing with the output gear 150 is fitted to the document moving lead screw 151. Therefore, the step motor 12
When the output gear 150 rotates due to the driving force of 0, the screw cylinder integrated with the gear that meshes with the output gear 150 rotates. When the screw cylinder rotates, the lead screw for moving the document that fits inside the screw cylinder 15
1 moves up and down relatively. For this reason, the stage 51 to which the document moving lead screw 151 is integrally fixed moves up and down as a whole. At this time, the entire stage motor 53, scanning lead screw 54, and screw cylinder 55 move up and down. When the stage 51 moves up and down as a whole, the first and second imaging lenses 9
Focusing can be performed by changing the distance of the document holder 21 with respect to 2,102.

On the other hand, the optical path switching lead screw 152 is
As shown in FIG. 4, an integral gear that meshes with the output gear 150 is provided. Therefore, the output gear 150 includes a gear integrated with the screw cylinder and an optical path switching lead screw.
The 152 and the integral gear are engaged at the same time. And
As shown in FIG. 4, a screw cylinder formed at the rear end portion of the switching lever 130, that is, the right end portion in FIG. 4, is fitted into the optical path switching lead screw 152.

Therefore, when the output gear 150 is rotated by the driving force of the step motor 120, the optical path switching lead screw 152 integrated with the gear meshing with the output gear 150 is rotated. When the optical path switching lead screw 152 rotates, the switching lever 130 integrated with the screw cylinder that meshes with the optical path switching lead screw 152 relatively moves up and down. When the switching lever 130 moves up and down, the front end portion, that is, the second reflecting mirror 82 connected to the left end portion in FIG. 4, pivots about its rotation axis 83, as shown by the solid line and the dotted line in FIG. The first and second optical paths 90 and 100 are switched by appearing and disappearing in the optical path of the transmitted light entering from the entrance window 62.

In the description of the second embodiment, the same components as those of the first embodiment described above will be designated by the same reference numerals and the description thereof will be omitted. Further, as the driving means, the rotational force of the step motor 120 is applied to the original moving lead screw 151.
Although the linear motion is converted by the optical path switching lead screw 152 and the optical path switching lead screw 152, other link mechanism or cam mechanism may be used. Further, a clutch mechanism is provided between the output gear 150 of the step motor 120 and the two lead screws 151 and 152.
The lead screws 151, 152 of the book may be selectively driven.

On the other hand, in the second embodiment, as in the first embodiment described above, the first and second imaging lenses are used.
One of 92 and 102, for example, the range of the depth of focus of the second imaging lens 102 may be included in the other, for example, the range of the depth of focus of the first imaging lens 92. In this way, by including the range of the depth of focus of the second imaging lens 102 in the range of the depth of focus of the first imaging lens 92, the document holder 21 is moved up and down, and the depth of focus is shallow (narrow). Second optical system 10
By performing the focusing of 1, the focusing of the first optical system 91 having a deep (wide) focal depth can be performed at the same time, and the focusing of both the first and second optical systems 91 and 101 can be performed at the same time. There are advantages.

[0075]

Since the present invention is constituted as described above, it has the following effects. Claim 1
According to the invention described above, not only can documents of different sizes be handled, but also switching of sizes and focusing can be driven by a common drive means, and at the same time, the entire document holder or optical system holder can be moved, which simplifies the operation. It is possible to provide an image input device capable of focusing with a simple structure and downsizing the device. According to the invention of claim 2,
In addition to the effect of the first aspect of the present invention described above, it is possible to provide an image input device with easy focus adjustment by making it possible to focus originals of different sizes at the same time.

According to the invention described in claim 3, in addition to the effect of the invention described in claim 1 or claim 2, by setting a fixed magnification, an appropriate magnification can be set according to the size of the original. It is possible to provide the image input device described above. According to invention of Claim 4, above-mentioned Claims 1-
In addition to the effect of the invention described in 3, by using the reflection mirror for size switching, it is possible to provide an image input device capable of further simplifying the structure of the optical path switching means and further downsizing.

[Brief description of drawings]

FIG. 1 is a schematic vertical sectional view of an image input device.

FIG. 2 is an external perspective view of an image input device.

FIG. 3 is a schematic enlarged vertical sectional view of an optical system holder.

FIG. 4 shows a second embodiment of the image input device, which is a schematic vertical sectional view of the image input device.

FIG. 5 is a schematic horizontal sectional view of a conventional image input device.

FIG. 6 is an external perspective view of a conventional image input device.

[Explanation of symbols]

10 Image input device 20 Film original (original) 21 Original holder 30 Case 31 Insertion port 32 Air intake hole 33 Exhaust fan 40 Original illumination unit 41 Light source (illumination means) 41a Concave mirror 42 Heat absorption filter 43 Diffuser 44 Color filter 45 First illumination lens 46 Second illumination lens 47 First illumination mirror 48 Second illumination mirror 49 Third illumination mirror 50 Original scanning unit 51 Stage 52 Original scanning means 53 Stage motor 54 Scanning lead screw 55 Screw cylinder 60 original reading section 61 optical system holder 62 entrance window 70 power supply section 80 optical path switching means 81 first reflection mirror 82 second reflection mirror 83 rotation axis 90 first optical path 91 first optical system 92 first imaging lens (imaging means) The first image forming means which constitutes the image forming means) 93 The first sensor which constitutes the image reading means 100 The second optical path 101 The second optical system 102 The second image forming lens (the second image forming means which constitutes the image forming means) 103 The image reading Means Second sensor 110 Optical system holding member 111 First surface 112 Second surface 120 Step motor (driving means) 130 Switching lever 140 Output gear 141 Optical system moving lead screw (focusing transmission means) 142 Optical path switching lead screw (Transmission means for optical path switching) 131 Switching lever 150 Output gear 151 Lead screw for moving original (Transmission means for focusing) 152 Lead screw for optical path switching (Transmission means for optical path) 200 Conventional image input device 210 Slide film 211 Slide Holder 212 Stage 213 Guide rail 214 Screw cylinder 220 Light source 220a Concave mirror 221 Color filter group 222 Lens group 223 Reflective mirror 224 Imaging lens 225 CCD 226 Optical system support member 227 Screw cylinder 230 Film scanning mechanism 231 Stage motor 232 Scanning lead screw 240 Focusing mechanism 241 Focus adjustment motor 242 Focus adjustment lead screw 250 Case 251 Recess 252 Air intake Hole 253 exhaust fan 254 power supply

Claims (4)

[Claims] 1. A document holder for holding a document, illumination means for illuminating an image of the document held by the document holder, and reflected light / transmitted light incident through the document illuminated by the illumination means. An image including image forming means for forming images by first and second image forming means having different magnifications, and first and second sensors for reading the images formed by the first and second image forming means, respectively. A reading means and a first optical path located in the optical path from the document to the first and second image forming means, and causing reflected light / transmitted light incident through the document to enter the first image forming means. And an optical path switching means for switching to a second optical path to be incident on the second image forming means, a driving means for driving the optical path switching means, and an optical housing for accommodating the image forming means, the image reading means and the optical path switching means. With system holder The image input device is characterized in that the drive means performs focusing by moving either one of the document holder and the optical system holder with respect to the other. 2. The image input device according to claim 1, wherein the range of the depth of focus of one of the first and second image forming means is included in the range of the depth of focus of the other. 3. The optical system holder is characterized in that the distances between the first and second image forming means and the first and second sensors forming a pair are kept constant. The image input device according to claim 1 or 2. 4. The switching means is composed of a reflection mirror.
The image input device according to item.