JP3536942B2 - Image input device - Google Patents

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 and non-transparent originals of different sizes, and more particularly to improving the reliability of a focusing operation.

[0002]

2. Description of the Related Art Conventionally, as an example of this type of image input apparatus, a scanner for a so-called 35 mm size slide film is shown in FIGS. FIG. 9 is a schematic horizontal sectional view of a conventional image input device, and FIG. 10 is an external perspective view of the conventional image input device.

In FIGS. 9 and 10, reference numeral 200 denotes a conventional image input device. As shown in FIG. 9, the image input device 200 has a slide holder 211 for holding a slide film 210 at the center thereof. And slide holder 211
The slide holder 21 is located on the right side in FIG.
Light source 220 for illuminating slide film 210 held in 1
Is arranged. Illumination light from the light source 220 having the concave mirror 220a is applied to the slide film 210 via the filter group 221 and the lens group 222.

A reflection mirror 223 is disposed on the left side of the slide holder 211 in FIG. The transmitted light transmitted through the slide film 210, after the optical axis is bent at right angles through the reflection mirror 223,
A line type image sensor C is formed by the imaging lens 224.
Imaged on CD225. 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 external image processing unit (not shown) such as a computer.

As shown in FIG. 9, the slide holder 211 is slidably held on two guide rails 213 via a stage 212, and is moved in the sub-scanning direction by a film scanning mechanism 230. Above film scanning mechanism 230
As shown in FIG. 9, the stage motor 231 is roughly divided.
And a scanning lead screw 232 rotated by the motor 231.
It is composed of

The scanning lead screw 232 is screwed into a screw cylinder 214 of the stage 212, as shown in FIG. Therefore, when 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, as shown in FIG. 9, the imaging lens 224 and the CCD 225 are held at a predetermined interval by an optical system support member 226. Then, 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. 9, the focusing mechanism 240 includes a focus adjustment motor 241 and a focus adjustment lead screw 242 rotated by the motor 241.

Then, the focus adjusting lead screw 242 is used.
As shown in FIG. 9, the screw cylinder 227 of the optical system support member 226 is
Screwed into. Therefore, the focus adjustment motor 241
By rotating, the optical system support member 226 moves parallel to the optical axis, and changes the distance between the imaging lens 224 and the slide film 210 held by the slide holder 211.

An image processing unit (not shown) such as a computer connected to the image input device 200 drives the focusing mechanism 240 in addition to the image input processing, based on the input image signal. The contrast of the image is calculated, and the focusing operation is automatically performed. FIG.
In FIG. 0, reference numeral 250 denotes a case, and a recess 251 is formed in the center of the case 250, and the recess 251 forms a moving space for the slide holder 211. As shown in FIGS. 9 and 10, 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. Heat generated from the power supply 254 and the like is exhausted to the outside of the case 250.

[0010]

However, in the conventional image input device 200 described above, the magnification of the imaging lens 224 is fixed for a so-called 35 mm size slide film. There was a first problem that it could not be used. For example, 4
When used on an inch x 5 inch film original,
Only part of it can be read.

Conversely, if the magnification of the imaging lens 224 is fixed in accordance with a 4 inch × 5 inch size film original, conversely, when the imaging lens 224 is used for a so-called 35 mm size film original, all of the pixels of the CCD 225 are used. Since only a part 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 document.

On the other hand, the magnification of the imaging lens 224 may be made variable.
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 must be performed individually, which complicates the mechanism and causes a second problem that the apparatus becomes large. There is a possibility that.

The invention according to claim 1 has been made in view of the above-mentioned first and second problems of the prior art, and its object is to deal with originals of different sizes. In addition to the above, it is an object of the present invention to provide an image input device which can drive the focusing of both optical systems by one driving means, and reduces the load on the driving means, and has a highly reliable operation.

The second aspect of the present invention is the first aspect of the present invention.
In addition to the object of the invention described above, a reflection mirror can be used for size switching. Therefore, an object of the present invention is to simplify the structure of the optical path changing means and to reduce the size. According to a third aspect of the present invention, in addition to the object of the first aspect, a half mirror can be used for size switching. Therefore, the invention according to claim 3 does not require an alternative switching of the optical path as compared with the invention according to claim 2, so that the structure of the optical path changing means is further simplified and the size is further reduced. With the goal.

The invention according to claim 4 is the above-described claim 1.
In addition to the objects of the inventions described in (1) to (3), by arranging the pair of biasing means symmetrically with respect to the transmitting means, the load applied to the driving means can be further reduced, and the image input apparatus having higher operation reliability can be obtained. It is intended to provide.

[0016]

SUMMARY OF THE INVENTION The present invention has been made to achieve the above-mentioned object, and its contents will be described below with reference to embodiments shown in the drawings. The invention according to claim 1 is characterized by having the following seven configurations, for example, 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. Second
Is an illuminating means (for example, a light source 41). The illuminating means (for example, the light source 41) is provided on the original (for example, the film original 20) held in the original holder (21) as shown in FIG. It illuminates the image.

The third is an image forming means (for example, first and second image forming lenses 92 and 102).
The second imaging lenses 92 and 102), as shown in FIGS. 3 and 5, for example, reflect reflected light / transmitted light incident through the original (eg, the film original 20) illuminated by the illumination means (eg, the light source 41). An image is formed by first and second image forming means having different magnifications (for example, first and second image forming lenses 92 and 102).

Fourth, image reading means (for example, first,
This image reading means (for example, the first and second sensors 93 and 103) is provided, for example, in FIGS.
As shown in the figure, the first and second image forming means (for example, the first and second image forming means)
First and second sensors (93, 103) for reading images formed by the second imaging lenses 92, 102) are provided. Fifth
Is a focusing stage (112), which has first and second surfaces (113, 114) facing away from each other, as shown in FIG.

In addition, the focusing stage (11)
2) is, for example, as shown in FIGS.
The first imaging means (for example, the first imaging lens 92) and the first sensor (93), and the second surface (114) to the second imaging means (for example, the second imaging lens 102). It is configured to be movable while holding the second sensor (103).

Sixth is an optical path changing means (80). The optical path changing means (80) converts the original (for example, the film original 20) to the first and the second as shown in FIGS. It is located in the optical path to two image forming means (for example, first and second image forming lenses 92 and 102). In addition to this, the optical path changing means (80)
The first means for causing reflected light / transmitted light incident through the original (for example, the film original 20) to be incident on the first imaging means (for example, the first imaging lens 92) as shown in FIG. The optical path (90) is changed to, for example, a second optical path (100) to be incident on the second imaging means (for example, the second imaging lens 102) as shown in FIG.

Seventh, the driving means (for example, a step motor
120) and the driving means (for example, the stepping motor 1
20) is to move the focusing moving table (112) in parallel with the optical axes of the first and second optical paths (90, 100) to perform focusing, as shown in FIGS. It is.
According to a second aspect of the present invention, there is provided the following configuration in addition to the configuration of the first aspect of the invention.

That is, the optical path changing means (80) is composed of reflection mirrors (for example, first and second reflection mirrors 81 and 82) as shown in FIGS. According to a third aspect of the present invention, there is provided the following configuration in addition to the configuration of the first aspect of the invention. That is, the optical path changing means (80) is composed of a half mirror (140), for example, as shown in FIG.

The invention according to claim 4 is the above-described claim 1.
In addition to the configurations of the inventions described in (1) to (3), the following three configurations are provided. First, as shown in FIGS. 3 and 4, for example, a transmission means (for example, a transmission lead screw 121) for transmitting a driving force of a driving means (for example, a step motor 120) is provided on the focusing moving table (112). Are connected.

Secondly, as shown in FIG. 4, for example, as shown in FIG. 4, a pair of attachments symmetrically arranged so as to sandwich the transmission means (for example, the transmission lead screw 121) are provided on the focusing carriage (112). A biasing means (for example, tension springs 127, 127) is mounted. Third, the focusing carriage (112)
For example, as shown in FIG. 4, both biasing means (for example, tension springs 127, 127) are urged toward the transmitting means (for example, the transmission lead screw 121).

[0026]

[Operation] Therefore, according to the first aspect of the present invention,
By driving the driving means (for example, the step motor 120), the focus moving table (112) can be moved in parallel to the optical axes of the first and second optical paths (90, 100). At this time, the first and second image forming means (for example, as shown in FIG. 3) are formed on the first and second surfaces (113, 114) of the focusing moving base (112) facing each other. First and second imaging lenses 92 and 102) and the first and second sensors
(93, 103), the distances of the first and second imaging means (eg, the first and second imaging lenses 92, 102) to the original (eg, the film original 20) change, Focusing is performed.

The first and second imaging means (for example, first and second imaging lenses 92 and 102) forming a pair and the first and second imaging lenses 92 and 102, respectively.
As shown in FIG. 3, a second sensor (93, 103) is provided with a first focusing unit (112) as a center, and
Since the lens is held on each of the second surfaces (113, 114), blurring in the direction perpendicular to the optical axes of the first and second optical paths (90, 100) of the focusing carriage (112) is reduced, and the driving means (For example, the load on the step motor 120) is reduced.

The second aspect of the present invention is the first aspect of the present invention.
In addition to the functions of the described invention, the following functions are provided. That is, the reflection mirrors (for example, the first and second reflection mirrors 81 and 8)
According to 2), for example, as shown in FIGS. 3 and 5, the first optical path (90) and the second optical path (100) can be selectively changed.

The third aspect of the present invention is the first aspect of the present invention.
In addition to the functions of the described invention, the following functions are provided. That is, as shown in FIG. 8, for example, reflected light / transmitted light incident through the original (eg, the film original 20) by the half mirror (140) is transmitted to the first optical path (90) and the second optical path (90).
The optical path (100) can be divided into two.

The invention according to claim 4 is the above-described claim 1.
In addition to the functions of the inventions described in (1) to (3), the following functions are provided. That is, the focusing stage (112) is urged toward the transmission means (for example, the transmission lead screw 121) by the two urging means (for example, the tension springs 127, 127) as shown in FIG. 4, for example. Therefore, the driving force of the driving means (for example, the stepping motor 120) can be transmitted to the focusing moving base (112) by following the transmitting means (for example, the transmission lead screw 121).

At this time, a pair of biasing means (for example, tension springs 127, 127) are, for example, as shown in FIG. 4, so that the focusing means (112) sandwiches the transmission means (for example, the transmission lead screw 121). ), The transmission means (for example, the transmission lead screw 121)
It is possible to reduce the moment generated around.

[0032]

1 to 7 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. 4 is a schematic horizontal cross-sectional view of the system holder, FIG. 4 is a schematic horizontal cross-sectional view, FIG. 5 corresponds to FIG. 3, and FIG. 6 corresponds to FIG. FIG. 7 is an enlarged vertical sectional view of the optical system holder during transportation, and FIG. 7 is a partial schematic horizontal sectional view of the optical system holder during transportation, corresponding to FIG.

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 processing unit (not shown) such as an external computer. ) Is used as a scanner for outputting an image signal. As the film original 20, two types having different sizes, for example, a so-called 35 mm size and a 4 inch × 5 inch size are selected.

The size of the film original 20 is not limited to the so-called 35 mm size and the 4 inch × 5 inch size, but may be another size such as 6 cm × 6 cm, 6 cm × 7 cm, 6 cm × 9 cm, or the like. Further, the original may be a transparent original such as a film original 20 or a negative film, or a non-transparent original such as a printed print, a poster, a book, or a magazine.

As shown in FIG. 2, in the present embodiment, the film original 20 is held in the original holder 21 and the oblong insertion port substantially at the center of the front height of the case 30 of the image input apparatus 10 is provided. Inserted horizontally from 31. As shown in FIG. 2, the document holder 21 has, for example, a frame shape and holds a non-image surface around the image surface of the film document 20, and an opening in which the image surface of the film document 20 faces the front and back surfaces. 22 are formed.

The document holder 21 may be replaced by a so-called slide mount, or may be one that can hold the unmounted film document 20. The size of the document holder 21 may be of two sizes, that is, a 35 mm size and a 4 inch × 5 inch size. Alternatively, for example, a larger 4 inch × 5 inch size film original 20 may be prepared. The opening 22 may be masked when a small size, that is, a so-called 35 mm size is used. Further, the film original 20 may be an image in which a plurality of frames of images are continuously arranged in a line, or may be an image cut for each frame.

As shown in FIG. 1, the inside of the case 30 is vertically divided into three layers around the insertion port 31. First, as shown in FIG.
A document illuminator 40 for illuminating the film document 20 is provided. Next, a document scanning unit that scans the film document 20 is provided on an intermediate layer in the case 30, that is, below the document illumination unit 40.
50 are located. Further, a document reading unit 60 that reads an image of the film document 20 is arranged on a lower layer in the case 30, that is, below the document scanning unit 50. The document reading unit 60 is disposed in the front half of the front side of the case 30 having the insertion port 31, and the power supply unit 70 is disposed in the rear half thereof.

First, the document illumination section 40 will be described with reference to FIG. As shown in FIG. 1, the document illuminating section 40 includes a light source 41 as an illuminating means for illuminating the film document 20.
And various filters 42 to 44 disposed within 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 FIG. 2, the light source is constituted by, for example, a halogen lamp having a concave mirror 41a.

As shown in FIG. 1, the filters 42 to 44 are, from the light source 41 side, a heat ray absorbing filter 42 and a diffusion plate 43.
And a color filter 44 are arranged. The heat ray absorbing filter absorbs heat rays from the halogen lamp. The diffusion plate 43 forms an even and uniform light source surface. As the color filter 44, three color filters of red, green and blue are used, and the same image is alternately read for each color,
A color image 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 can be omitted, and more than three filters may be arranged. As shown in FIG. 1, the lenses 45 and 46 include a first illumination lens 45 and a second illumination lens 46 from the light source 41 side. As the first illumination lens 45, for example, a Fresnel lens is used.

As shown in FIG. 1, a plurality of Fresnel lenses, for example, two Fresnel lenses are used for the second illumination lens 46. The illumination light emitted from the light source 41 is collected behind the film original 20 by the first and second illumination lenses 45 and 46. Although the Fresnel lenses are used as the illumination lenses 45 and 46, the present invention is not limited to the Fresnel lenses, and ordinary lenses may be used. In addition, the first and second illumination lenses 45 and 46 are used as the illumination lenses 45 and 46, but are not limited to the two illumination lenses 45 and 46, but may be one or three or more. May be arranged. 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 illumination mirrors 47 to 49 include a plurality of, for example, three first to fourth illumination lenses disposed between the first illumination lens 45 and the second illumination lens 46. It is composed of three illumination mirrors 47-49. 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, as shown in FIG.
A light source 41 disposed on the back side of the case 30 and including a concave mirror 41a
The illumination light emitted from the device travels horizontally toward the front of the case 30. The illumination light traveling in the horizontal direction is the first illumination mirror
The light is reflected by 47 and its optical axis is bent vertically downward. After that, the illumination light reflected by the first illumination mirror 47 is horizontally bent toward the back of the case 30 by the second illumination mirror 48, and further vertically downwardly bent by the third illumination mirror 49 to form a film. The light is vertically incident on the horizontal film surface of the document 20.

As described above, the optical path of the illumination light is folded by the three illumination mirrors 47 to 49, and the optical path is arranged parallel to the film surface of the film original 20. There is an advantage that the thickness in the direction can be reduced. In addition, the number of the mirrors 47 to 49 for illumination 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 original scanning unit 50 is configured to hold the original holder 21 inserted through the insertion port 31 of the case 30.
And a stage 51 for holding the stage 51 parallel to the image plane of the film original 20, that is, horizontally.
The document scanning means 52 is slid parallel to the 20 image planes, that is, horizontally.

As shown in FIG. 1, the original 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 the stage into which this scanning lead screw 54 is screwed.
It is composed of a screw cylinder 55 provided at 51, and a guide member (not shown) passed back and forth. Therefore, when the stage motor 53 is driven, the scanning lead screw 54 rotates, and the stage 51 moves horizontally since the scanning lead screw 54 is screwed into the screw cylinder 55 of the stage 51.

Although the rotational force of the stage motor 53 is converted into linear motion by the scanning lead screw 54 and the screw cylinder 55 into which the scanning lead screw 54 is screwed, other link mechanisms and cam mechanisms are used. May be. Next, the document reading unit
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 has a hollow box shape and constitutes a so-called dark box, and has an upper surface on which the transmitted light after passing through the film original 20 is incident. A window 62 is formed. In the optical system holder 61, as shown in FIGS. 3 and 4, when roughly classified, the optical axis of the transmitted light vertically incident from above through the entrance window 62 is bent in two horizontal directions, and the first optical path 90 ( 3) and the second optical path 100
(See FIG. 5).
First and second optical systems 91 and 101, which are respectively disposed in the second optical paths 90 and 100 and have different magnifications, in upper and lower stages, and first and second optical systems 91 and 1
1 for driving the focusing means 110 for performing the focusing of 01, and the optical path changing means 80 and the focusing means 110, respectively.
And a stepping motor 120 as one driving means.

The optical path changing means 80 comprises two first and second reflection mirrors 81 and 82 as shown in FIGS. The first reflection mirror 81 is, as shown in FIG.
The optical axis of the transmitted light, which is fixed to the lower side of the optical system holder 61 and vertically incident from above through the entrance window 62, is bent in a right angle direction and further, toward the front direction where the insertion port 31 of the case 30 is located.

The second reflection mirror 82 is disposed between the entrance window 62 and the first reflection mirror 81 as shown in FIGS. 3 and 5, and is rotatable to the optical system holder 61 via a mirror frame 83. The mirror frame 83 is pivotally supported, and comes into and out of the optical path of the transmitted light that enters from the entrance window 62 by turning. The mirror frame 83 is
As shown in FIGS. 3 and 4, the section has a U-shape in cross section, and both ends are bent inward from each other. Further, inside the mirror frame 83, a mirror fixing plate 84 to which the second reflection mirror 82 is fixed is movably held in the thickness direction of the mirror frame 83.

As shown in FIGS. 3 and 4, one end of the mirror frame 83 is connected to an optical system holder via a fixed shaft 85.
It is supported on 61. In addition, a compression spring 86 is provided between the other end of the mirror frame 83 and the mirror fixing plate 84,
Due to the spring force of the compression spring 86, the mirror fixing plate 84 elastically contacts the inner surface of the bent end 87 of the mirror frame 83. As shown in FIG. 4, a torsion spring 88 is provided on the fixed shaft 85 of the mirror frame 83, and the second reflecting mirror 82 always operates as shown in FIG. It rotates in a direction away from the optical path of the transmitted light entering from the entrance window 62.

As shown in FIGS. 3 to 5, a pair of left and right angle limiting members 89, 89 are provided within the rotation range of the mirror frame 83. At the position where the fixing plate 84 is in contact, the second reflection mirror 82 projects into the optical path of the transmitted light entering from the entrance window 62. And
As shown in FIG. 5, the transmitted light is reflected by the second reflecting mirror 82, and is bent in the direction perpendicular to the optical axis and in the front direction where the insertion port 31 of the case 30 is located.

The first optical system 91 includes, as shown in FIG.
A first imaging lens 92 as first imaging means for imaging transmitted light reflected by the first reflection mirror 81, and an image reading means for reading an image formed by the first imaging lens 92 are configured. And a first sensor 93 that performs the operation. As shown in FIG. 5, the second optical system 101 forms an image of the transmitted light reflected by the second reflection mirror 82, and has a larger magnification than the first imaging lens 92. The image forming apparatus includes a second imaging lens 102 and a second sensor 103 that forms an image reading unit that reads an image formed by the second imaging lens 102.

The first and second parts constituting the image reading means
As the sensors 93 and 103, for example, CCD line sensors are used. For this reason, the first optical system 91 is used for the film original 20 having a size of 4 inches × 5 inches since the magnification of the first imaging lens 92 is smaller than that of the second imaging lens 102. On the other hand, in the second optical system 101, since the magnification of the second imaging lens 102 is larger than the first imaging lens 92,
Used for a so-called 35 mm size film original 20.

As shown in FIGS. 3 and 4, the focusing means 110 is fixed in the optical system holder 61 and has a pair of left and right guide rails 111 elongated in the front-rear direction of the case 30.
A focusing carriage that slides along both guide rails 111 and has first and second optical systems 91 and 101 fixed thereto.
112. Moving table 112 for focusing
Has first and second surfaces 113 and 114 which are vertically opposed to each other as shown in FIG. Then, although not shown, on the first surface 113 side facing the lower side of the focus moving table 112,
For example, it has a rolling bearing such as a linear ball bearing, and slides on the guide rail 111 via this bearing.

As shown in FIG. 3, the first image forming lens 9 is provided on the first surface 113 facing the lower side of the focusing moving table 112.
The distance between the second sensor 1 and the first sensor 93 is fixed and fixed. In addition, the distance between the second imaging lens 102 and the second sensor 103 is fixed to the second surface 114 facing upward while maintaining a constant distance. Therefore, the first and second imaging lenses
Since the distances between 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.

Also, the first and second focusing rails 111 are moved along the left and right guide rails 111, so that the first and second focusing rails 111 move.
The optical systems 91 and 101 can be moved simultaneously. Therefore, the movement of the focusing stage 112 enables the focusing of the first and second optical systems 91 and 101. That is,
The distance between the film original 20 held by the original holder 21 and the first and second image forming lenses 92 and 102 is changed by moving the focusing moving table 112, and the first and second optical systems 91 and 101 are changed. The focus is on.

In particular, when a slide mount is used as the original holder 21 as it is, its thickness varies, and the position of the image surface of the film original 20 may move in the optical axis direction. As a result, film slides can be used to reduce focus shift due to uneven thickness of the slide mount.
Focusing is performed by correcting the distance from the 20 image planes to the first and second imaging lenses 92 and 102, respectively.

As shown in FIGS. 3 and 4, the stepping motor 120 is fixed in the optical system holder 61, and a transmission lead screw as a driving force transmission means is provided between the stepping motor 120 and the focusing moving table 112. 121 are provided. Although the step motor 120 is used as the driving means, another DC / AC motor may be used. Transmission lead screw 121
As shown in FIGS. 3 and 4, the driving gear 1 of the stepping motor 120 is disposed at the center on the left and right of the focus moving table 112.
A transmission gear 123 meshing with 22 is fixed.

As shown in FIGS. 3 and 4, a nut 124 is screwed into the transmission lead screw 121.
As shown in FIGS. 3 and 4, the nut 124 contacts the rear end surface of the focusing movable base 112, and its rotation is restricted by a rotation restricting member 125 (FIG. 4) protruding from the focusing movable base 112. ing.

The moving table for focusing 112 shown in FIG.
As shown in FIG. 4, a gap adjusting member 126 is fixed at a position where the gap adjusting member 126 comes into contact with the nut 124. By changing the thickness of the gap adjusting member 126, the contact position between the focusing moving base 112 and the nut 124 can be adjusted. This is to correct the variation due to the processing / assembly accuracy of the lens and the mechanical parts.

As shown in FIG. 4, a pair of biasing springs 127, 127 are symmetrically arranged on the left and right sides of the focusing movable base 112 so as to sandwich the transmission lead screw 121. Is installed. As shown in FIG. 4, one end of each of the left and right tension springs 127 is fixed to each of the left and right sides of the focusing movable base 112, and the other end is fixed to the optical system holder 61.

For this reason, the distance adjusting member 126 of the focusing moving base 112 is constantly urged by the spring restoring force of the left and right tension springs 127 in a direction in which it comes into contact with the nut 124. Then, when the transmission lead screw 121 rotates via the step motor 120, the position of the nut 124 moves in the front-rear direction, so that the focus moving table 112 slides following the nut 124.

Although the rotational force of the step motor 120 is converted into linear motion by the transmission lead screw 121 and the nut 124, other link mechanisms or cam mechanisms may be used.
In addition, although the tension spring 127 as the urging means was used,
Other compression coil springs or leaf springs may be used. on the other hand,
As shown in FIG. 4, a stopper 128 that regulates the retreating position of the focusing movable base 112 is fixed to the optical system holder 61, and the rear end face of the focusing movable base 112 abuts on the stopper 128. This regulates the retreating position of the focusing movable base 112.

Therefore, when the transmission lead screw 121 is further rotated at a position where the focusing movable base 112 abuts against the stopper 128, the nut 124 is moved to the focus movable base 112 as shown in FIGS. Away from the distance adjusting member 126 of FIG. At this time, the transmission of the driving force between the step motor 120 and the focusing movable base 112 is cut off. As shown in FIG. 4, a position sensor 129 such as a limit sensor is disposed at the most retracted position of the nut 124.
The origin position of the step motor 120 is determined based on the detection signal from.

On the other hand, as shown in FIGS. 3 and 4, the motive force of the focusing stage 112 is transmitted to the second reflecting mirror 82 between the focusing stage 112 and the second reflecting mirror 82. A pair of left and right connection members 130 as connection means is provided. As shown in FIGS. 3 and 4, the left and right connecting members 130 each have a connecting pin 131 at one end and a moving shaft 1 at the other end.
32 are provided respectively.

Each connecting pin 131 of the left and right connecting members 130
As shown in FIGS. 3 and 4, each is rotatably supported by a pair of left and right support members 115, 115 protruding in a tongue shape from a second surface 114 facing upward from the focusing movable base 112. That is,
As shown in FIGS. 3 and 4, the left and right support members 115 are provided with elongated holes 116 extending in the horizontal direction. And
The respective connecting pins 131 of the left and right connecting members 130 are respectively passed through the respective elongated holes 116 so as to be movable along the respective elongated holes 116.

Each moving shaft 1 of the left and right connecting members 130
As shown in FIGS. 3 and 4, each of the mirrors 32 is pivotally supported by a mirror frame 83 of the second reflection mirror 82. Therefore, in a state where the connecting pins 131 of the left and right connecting members 130 are located at the longitudinal center of the left and right long holes 116 of the focusing moving base 112 as shown in FIGS. Even if the moving carriage 112 slides slightly in the front-rear direction, the connecting pin 131 only moves in the elongated hole 116, and the left and right connecting members 130 do not move.

The above moving range is the moving range for focusing of the first optical system 91. At this time, the second reflection mirror
82 is separated from the optical path of the transmitted light incident from the entrance window 62 by the spring force of the torsion spring 88, and the optical path is changed to the first optical system 91.
Has been switched to. On the other hand, the connecting pin 131 is
When the focusing movable base 112 further retreats in a state where it comes into contact with the rear end of the dead end 16, as shown in FIG.
The right and left connecting members 130 are also pushed back by being pushed by the rear end of the 16.

Therefore, the moving shaft 132 of the left and right connecting members 130
5, the mirror frame 83 pivots clockwise about the fixed shaft 85 against the spring force of the torsion spring 88, as shown in FIG. Thus, at the position where the mirror frame 83 rotates and the mirror fixing plate 84 abuts against the angle limiting member 89, the second reflection mirror 82 projects into the optical path of the transmitted light entering from the entrance window 62, and the optical path is changed to the second path. Switch to the optical system 101.

The retracted position is the optical path switching movement range of the second reflection mirror 82. When the focusing carriage 112 is further retracted, the connecting pins 131 are pressed against the rear ends of the elongated holes 116 in a state where they abut against the rear ends of the elongated holes 116, and the left and right connecting members 1 are moved.
30 goes further back. At this time, with the retreat of the left and right connecting members 130, the respective moving shafts 132 also retreat, so that the mirror frame 8
3 further rotates clockwise, but since the mirror fixing plate 84 is in contact with the angle limiting member 89, the moving amount of each moving shaft 132 is absorbed by the compression spring 86 being elastically compressed.

For this reason, the mirror fixing plate 84 is an angle limiting member.
Since it is in contact with 89, the angle of the second reflecting mirror 82 does not change, and only the focusing movable base 112 retreats.
The moving range is the moving range for focusing of the second optical system 101. Further, when the focusing carriage 112 is retracted, the compression spring 86 is further elastically contracted. At this time, the rear end face of the focusing carriage 112 contacts the stopper 128 as shown in FIG.

When the transmission lead screw 121 is further rotated, the nut 124 is separated from the distance adjusting member 126 of the focusing moving base 112 as shown in FIGS. 6 and 7, and the transmission of the driving force is cut off. The last retreat position of the focus moving table 112 is a transport moving range. As described above, the focusing movable base 112 has four moving ranges, that is, the first optical system 9.
It has a moving range for focusing, a moving range for switching the optical path, a moving range for focusing of the second optical system 101, and a moving range for transportation.

That is, as shown in FIG. 7, the position where the nut abuts on the position sensor 129 is the origin position. Then, at the origin position, the nut 124 is a transporting movement range separated from the interval adjusting member 126 of the focusing moving base 112, and the second optical system 101
Moving range for focusing, moving range for optical path switching,
The optical system 91 moves to the focusing movement range.

The reason why the moving range for transport is excluded from the moving range for both focusing is to maintain the moving accuracy of the moving table 112 for focusing in the focus adjusting range. Further, in the transport movement range, the transmission of the driving force from the step motor 120 to the focusing moving base 112 is cut off, so that the load on the step motor 120 due to vibration or the like during transportation can be reduced.

Further, in the moving range for transportation, the compression spring 86 is elastically compressed, so that the mirror fixing plate 84 of the second reflecting mirror 82 is strongly pressed against the angle limiting member 89. It is possible to prevent rattling during transportation of 82. Although the second reflection mirror 82 has been turned via the left and right connecting members 130, the second reflection mirror 82 may be turned using another different link mechanism or cam mechanism.

Next, the tension spring 127 and the torsion spring 8
8. The force relationship between the three types of springs of the compression spring 86 will be described. Including the transmission efficiencies of the components other than the three types of springs, for example, the amount of force of the tension spring 127 is converted into the amount of force applied to the nut 124 that pushes the focusing carriage 112, and the amount of force of the tension spring 127 is F1, and the amount of force of the torsion spring 88 is F2. Assuming that the force of the compression spring 86 is F3,
The following relational expression is satisfied. At this time, the mirror fixing plate 84
Is in contact with the angle limiting member 89.

[0078]

[Formula 1] F1> F2 + F3 Relational Expression (1) Next, focusing on the force applied to the mirror fixing plate 84, the following relational expression is satisfied. At this time, it is assumed that the mirror fixing plate 84 is in contact with the angle limiting member 89.

[0079]

[Formula 2] F3> F2 Relational expression (2) Here, “F1” on the left side of the relational expression (1) represents the force for retracting the focusing base 112 and “F2 + F3” on the right side.
Conversely means a force for moving the focusing movable base 112 forward.

Further, “F3” on the left side of the relational expression (2) is
“F2” on the right side means a force for turning the mirror fixing plate 84 clockwise about the fixed shaft 85, and conversely, a force for turning the mirror fixing plate 84 counterclockwise. For this reason, according to the relational expression (1), the mirror fixing plate 84 is the angle limiting member.
Since the force of the tension spring 127 is superior even after the contact with 89, it can be seen that the state in which the gap adjusting member 126 of the focusing moving base 112 is in contact with the nut 124 can be maintained.
When driving the nut 124, the step motor 120
Can be moved by the difference between “F1” and “F2 + F3”. Also, the mirror fixing plate 8
Before “4” comes into contact with the angle limiting member 89, “F3” is not generated, so the stepping motor 120 can move the focusing mobile base 112 by the difference obtained by subtracting “F2” from “F1”. .

From the relational expression (2), the mirror fixing plate 84
Can prevent the compression spring 86 from elastically contracting when it comes into contact with the angle limiting member 89. On the other hand, on the left and right side surfaces of the case 30, a pair of left and right air intake holes 32, 32 are provided as shown in FIG. Further, an exhaust fan 33 is provided inside the case 30 behind the light source 41, and exhausts heat generated from the light source 41, the power supply unit 70, and the like inside the case 30 to the outside of the case 30.

Next, a procedure for using the image input device 10 having the above-described configuration will be described. For example, 4 inches x
In the case of a 5-inch size film original 20, as shown in FIG. 3, the optical path changing means 80 switches to the first optical path 90. As shown in FIG. 3, the transmitted light of the film original 20 is reflected by a first reflecting mirror 81, then imaged on a first sensor 93 via a first imaging lens 92, and is converted into an image of one line. Reading is performed.

While moving the focusing stage 112 within the focusing range of the first optical system 91, the difference in contrast of the read image is used to obtain the optimal focusing position. The moving platform 112 is stopped.
After focusing, the image of the film original 20 is two-dimensionally read by moving the film original 20 in the sub-scanning direction via the original scanning means 52.

On the other hand, in the case of a so-called 35 mm size, as shown in FIG. 5, the focusing stage 112 is moved to the optical path switching movement range, and the optical path changing means 80 switches to the second optical path 100. For this reason, as shown in FIG. 5, the transmitted light of the film original 20 is reflected by the second reflection mirror 82, and then is imaged on the second sensor 103 via the second imaging lens 102. Is read.

Then, while moving the focusing movable base 112 within the focusing movable range of the second optical system 101, utilizing the difference in the contrast of the read image,
The focusing movable base 112 is stopped at the optimal focal position. On the other hand, at the time of transport, as shown in FIGS. 6 and 7, the focus moving table 112 is moved to its transport range.

Next, FIG. 8 shows a second embodiment of the present invention, which is an enlarged vertical sectional view of the optical system holder. The feature of the second embodiment is that a half mirror is used as shown in FIG. 8 instead of the second reflection mirror 82 shown in the first embodiment. That is, a half mirror
140 is an entrance window 6 of the optical system holder 61, as shown in FIG.
2 and the first reflection mirror 81, and 45 ° with respect to the optical axis of the transmitted light vertically incident from above through the entrance window 62.
It is fixed in the optical system holder 61 so as to maintain a degree of inclination angle.

For this reason, as shown in FIG. 8, a part of the transmitted light entering from above through the entrance window 62 is a half mirror.
The light passes through 140 and enters the first reflection mirror 81. Further, another part of the transmitted light that is incident from above through the incident window 62,
As shown in FIG. 8, after being reflected by the half mirror 140,
An image is formed on the second sensor 103 via the second imaging lens 102.

When the half mirror 140 is used, the illuminance at the first and second sensors 93 and 103 decreases.
Although not shown, it is preferable to increase the luminance of the light source 41. In the description of the second embodiment, the same components as those of the first embodiment described above are denoted by the same reference numerals, and description thereof will be omitted. According to the second embodiment, the first
Since there is no need to switch the second reflection mirror 82 as in the embodiment, the structure of the optical path changing means 80 can be further simplified and the size can be further reduced.

[0089]

Since the present invention is configured as described above, it has the following effects. Claim 1
According to the invention described above, not only can the originals of different sizes be accommodated, but also the focusing of both optical systems can be driven by one driving means, and the load on the driving means can be reduced.
An image input device with high operation reliability can be provided.

According to the second aspect of the present invention, in addition to the effects of the first aspect of the present invention, the structure of the optical path changing means can be simplified by making it possible to use the reflection mirror for switching the size. In addition, it is possible to provide an image input device that can be reduced in size. Claim 3
According to the invention described in the above, in addition to the effect of the invention described in the above-described claim 1, by making it possible to use a half mirror for switching the size, an alternative optical path can be provided as compared with the invention described in the above-described claim 2. Since an unnecessary switching is not required, it is possible to provide an image input apparatus capable of further simplifying the structure of the optical path changing means and further reducing the size.

The fourth aspect of the present invention is the first aspect of the present invention.
In addition to the objects of the inventions described in (1) to (3), by arranging the pair of biasing means symmetrically with respect to the transmitting means, the load applied to the driving means can be further reduced, and the image input apparatus having higher operation reliability can be obtained. Can be provided.

[Brief description of the drawings]

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.

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

FIG. 4 is a schematic horizontal sectional view of the image input device.

FIG. 5 is an enlarged vertical sectional view of the optical system holder corresponding to FIG. 3 and showing a switching state of the reflection mirror;

FIG. 6 is an enlarged vertical sectional view of the optical system holder during transportation, corresponding to FIG.

FIG. 7 is a partial schematic horizontal sectional view of the optical system holder during transportation, corresponding to FIG. 4;

FIG. 8 shows a second embodiment of the present invention, which is an enlarged vertical sectional view of the optical system holder.

FIG. 9 is a schematic horizontal sectional view of a conventional image input device.

FIG. 10 is an external perspective view of a conventional image input device.

[Explanation of symbols]

10 Image input device 20 Film document (document) 21 Document holder 30 Case 31 Inlet 32 Air intake hole 33 Exhaust fan 40 Document illumination unit 41 Light source (illumination means) 41a Concave mirror 42 Heat ray absorption filter 43 Diffusion plate 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 unit 61 Optical system holder 62 Entrance window 70 Power supply unit 80 Optical path changing means 81 First reflection mirror 82 Second reflection mirror 83 Mirror frame 84 Mirror fixing plate 85 Fixed shaft 86 Compression spring 87 Bending end 88 Torsion spring 89 Angle Limiting member 90 First optical path 91 First optical system 92 First image forming lens (first image forming means forming image forming means) 93 First sensor 100 forming image reading means 100 Second light path 101 Second optical system 102 2nd imaging lens (Second image forming means forming image forming means) 103 Second sensor 110 forming image reading means 110 Focusing means 111 Guide rail 112 Moving table 113 First surface 114 Second surface 115 Support member 116 Slot 120 Step motor (Drive means) 121 Lead screw for transmission (Transmission means) 122 Drive gear 123 Transmission gear 124 Nut 125 Rotation limiting member 126 Interval adjustment member 127 Tension spring 128 Stopper 129 Position sensor 130 Connecting member (Connecting means) 131 Connecting pin 132 Moving shaft 140 Half mirror 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 Reflecting 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 Adjusting lead screw 250 Case 251 recess 252 air intake in hole 253 exhaust fan 254 power supply

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-57-135573 (JP, A) JP-A-57-123764 (JP, A) JP-A-3-169175 (JP, A) 72764 (JP, U) Japanese Utility Model Showa 64-3253 (JP, U) Japanese Utility Model Showa 62-178654 (JP, U) Japanese Utility Model Utility Model No. 6-81173 (JP, U) (58) Field surveyed (Int. ⁷ , DB name) H04N 5/225-5/257 G03B 27/34 H04N 1/00 H04N 1/19

Claims (4)

(57) [Claims] 1. A document holder for holding a document, illumination means for illuminating an image of the document held on the document holder, and reflected / transmitted light incident through the document illuminated by the illumination means Image forming means for forming images by first and second image forming means having different magnifications, and first and second sensors for reading images formed by the first and second image forming means, respectively. Reading means, first and second surfaces facing each other, wherein the first image forming means and the first sensor are provided on the first surface, and the second image forming means and the second image forming means are provided on the second surface. A focusing moving table configured to be movable while holding the two sensors, and reflected light that is located in an optical path from the document to the first and second imaging units and that enters through the document. A first optical path for transmitting transmitted light to the first image forming means and a first optical path An optical path changing means for changing to a second optical path to be incident on the second imaging means; and a drive for moving the focusing stage parallel to the optical axes of the first and second optical paths to perform focusing. And an image input device. 2. An image input apparatus according to claim 1, wherein said optical path changing means comprises a reflection mirror. 3. An image input apparatus according to claim 1, wherein said optical path changing means comprises a half mirror. 4. A pair of biasing means connected to a transmitting means for transmitting a driving force of a driving means and symmetrically disposed so as to sandwich the transmitting means, is mounted on the focusing carriage. The image input device according to any one of claims 1 to 3, wherein the focus moving table is urged toward the transmission means by the both urging means.