JP3527560B2 - 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 device that images a subject such as a photograph, a film, a manuscript, presentation paper and outputs a video signal representing the subject image.

[0002]

BACKGROUND ART An image input device is used for an electronic projector (displaying a captured image on a large-sized display device) or the like instead of an overhead projector (OHP).
The image input device includes an image pickup device that picks up an image of a subject, an image pickup lens, a lighting device, and the like, and is a relatively large device. In particular, a certain distance must be provided between the subject and the imaging lens, which is a factor that hinders miniaturization. In order to downsize the image input device, it is possible to fold the components of the image input device,
It is possible to fold it when not in use.

However, there is a drawback in that the folding structure is relatively complicated and it is difficult to easily fold and downsize.

Further, for example, a zoom lens is used to obtain a subject image in which the subject is enlarged or reduced, but the zoom lens is relatively expensive and it is difficult to reduce the cost of the image input device.

Further, the subject may be illuminated with light other than the illumination light from the illumination device provided in the image input device (for example, the light of an interior light). Then, in order to obtain an image with appropriate brightness, exposure control must be performed according to the amount of light other than illumination. In addition, the illumination is reflected on the subject surface so that the subject cannot be projected uniformly. Therefore, the operation of the image input device may be complicated.

[0006]

DISCLOSURE OF THE INVENTION An object of the present invention is to provide an image input device which can be miniaturized.

Another object of the present invention is to make it possible to obtain a subject image obtained by enlarging or reducing the subject without using a zoom lens.

Still another object of the present invention is to prevent the subject from being illuminated by light other than the illumination provided in the image input device.

In the image input device of the first invention, a box body composed of a lower half body having an open upper surface and an upper half body covering the upper surface opening of the lower half body, A pedestal on which a subject is placed, an omnifocal lens that forms a photographic subject image based on an incident light beam regardless of the optical distance to the pedestal that is placed on the pedestal, and a video signal that represents the photographic subject image formed by the omnifocal lens Is provided, the upper half body is vertically movable along the side wall of the lower half body, and is held at a predetermined height position, and the upper half body is provided with the subject. It is characterized in that a deflection mirror for guiding the reflected light beam from the lens to the all-focus lens is provided.

According to the image input device of the first invention, the upper half body is vertically movable along the side wall of the lower half body.
When the image input device is not in use, the upper half can be moved downward along the side wall of the lower half. Thereby, the image input device can be downsized. There is no need to fold the image input device to make it smaller, and the image input device can be made relatively simple.

According to the image input device of the first invention,
Since the deflection mirror is provided in the upper half body, even when the upper half body moves up and down along the side wall of the lower half body, the reflected light beam from the subject is given to the all-focus lens. Therefore, the subject image is formed on the imaging device. When the upper half is moved up and down along the side wall of the lower half, the optical distance from the subject to the omnifocal lens changes,
The imaging magnification also changes. By moving the upper half of the body, the imaging magnification changes, and a subject image that is enlarged or reduced with respect to the subject can be obtained.

The lower half body and the upper half body are made of a light shielding material, and the lower half body or the upper half body is further provided with an illuminating device for illuminating an object placed on the pedestal. It is preferable.

As a result, the light that illuminates the subject is only the light from the illumination. Since it is possible to prevent the subject from being illuminated by light other than illumination, exposure control may be performed in consideration of only the illumination light. Exposure control is relatively simple.

The image input device of the second invention can be housed in a box, is provided with a pedestal on which a subject is placed, and is movably provided in the box, and is output from the box. Omnifocal lens that forms a subject image based on the incident light beam, regardless of the optical distance to the subject placed on the mounted pedestal,
A lens moving mechanism for moving the position of the omnifocal lens to change the optical distance between the subject placed on the pedestal and the omnifocal lens, provided in the box, and imaged by the omnifocal lens And an image pickup device for outputting a video signal representing a subject image, and a deflection mirror which can be housed in the box body and gives reflected light rays from a subject placed on the pedestal to the all-focus lens. To do.

According to the image input device of the second invention, the pedestal and the deflection mirror which can be housed in the box are provided. When the pedestal and the deflection mirror are used as an image input device, they are taken out of the box body,
When not used as an image input device, it is stored in the box body. Therefore, when not used as the image input device, the size of the entire image input device can be reduced. In particular, the image input device can be made smaller without complicated folding.

The omnifocal lens is moved by the lens moving mechanism. When the omnifocal lens is moved, the optical distance from the subject to the omnifocal lens changes and the imaging magnification also changes. By moving the omnifocal lens, the imaging magnification is changed, and a subject image magnified with respect to the subject can be obtained.

The box body is made of a light blocking material, and a light blocking plate for blocking the subject placed on the pedestal taken out from the box body and the subject placed on the pedestal taken out from the box body is illuminated. It is preferable that a lighting device for controlling is further provided.

As a result, the light that illuminates the subject is only the light from the illumination. Since it is possible to prevent the subject from being illuminated by light other than illumination, exposure control may be performed in consideration of only the illumination light. Exposure control is relatively simple.

[0019]

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIGS. 1 and 2 show an embodiment of the present invention and are front views of an image input apparatus.

The box body of the image input device has a substantially rectangular shape when seen in a plan view, and includes a lower half 10 and an upper opening 11 of the lower half 10.
It is composed of an upper half body 60 for covering. The upper half 60 can be moved up and down with respect to the lower half 10. 1 shows the shape of the box of the image input device when the upper half 60 is in the raised position, and FIG. 2 shows the shape when the upper half 60 is in the lowered position.

The lower half 10 is a bottom plate and left and right inner side plates 16A.
And a rear face plate 16B and an outer face plate 11A provided outside the inner face plate 16A with a slight gap.
A gap between the inner side plate 16A and the outer side plate 11A serves as a guide for guiding the vertical movement of the upper half body 60. This lower half 10
It is also possible to provide a front plate on the.

Stoppers 13 are provided on the outer surfaces of both outer side plates 11A.
It is swingably attached by a shaft 14b fixed to a bracket 14a. At a position below the shaft 14b of the stopper 13, the operation piece 13A extends obliquely downward. A claw 13B is formed on the stopper 13.

A pedestal 20 is provided in the lower half body 10 at a predetermined height from the bottom surface thereof in parallel with the bottom surface, and is fixed to the inner plate 16A on the right side at one end thereof. This pedestal 20 is a subject (manuscript, presentation paper, photograph, etc.) displayed on the screen of the television device 50 using an image input device.
Is to put. A positioning frame 21 is formed on the upper surface of the pedestal 20 to determine the position of the subject on the pedestal 20. The subject OB is placed in the positioning frame 21 on the pedestal 20.

The pedestal 20 has an object O placed on the pedestal 20.
A transparent plate 23 for holding B is provided. This transparent plate 23 is swingably attached to the base 20 by a hinge 22,
The transparent plate 23 opens and closes in the arrow direction with the hinge 22 as a fulcrum.

Inside the lower half body 10, a mirror of an all-focus lens is provided on the optical path of the light beam from the object OB deflected by the deflection mirrors 61 and 62 provided in the upper half body 60 which will be described in detail later. A cylinder 30 is provided. This omnifocal lens is a lens that forms a subject image based on an incident light beam regardless of the optical distance to the subject OB placed on the pedestal 20.

A CCD as a solid-state electronic image pickup device is arranged in the lens barrel on the image plane of the all-focus lens. This CCD is mounted on a substrate 32 supported on the bottom plate of the lower half 10 by a substrate mounting support 31. A video signal representing a subject image is output from the CCD 33.

An image pickup circuit 34 and a video circuit 35 are also mounted on the substrate 32. The image pickup circuit 34 is a circuit for inputting the image signal output from the CCD 33 and performing image pickup processing such as color balance adjustment processing and gamma correction processing of the image signal, and the image pickup processed image signal is output. Video circuit
Reference numeral 35 is a circuit for inputting the video signal output from the image pickup circuit 34 and performing a reproduction process for displaying it on the television device 50. The video circuit 35 is provided with an output terminal 36, and the output terminal 36 and the input terminal of the television device 50 are electrically connected by a cord.

An illumination device 41 for illuminating an object OB placed on the pedestal 20 is further provided in the lower half body 10. The lighting device 41 is attached to a support arm 42 which is erected on the bottom plate of the lower half body 10.

The upper half 60 has a longitudinal section of a hexagonal shape obtained by cutting the upper right corner and the upper left corner of a rectangle, and the deflection mirror 61 is provided inside the inclined walls 65 and 66 at the upper right corner and the upper left corner cut from the rectangle. And 62 are provided. The deflection mirrors 61 and 62 are positioned so that the reflected light beam from the object OB can be guided to the lens barrel 30 of the omnifocal lens.

Left and right side walls 64A extend downward from the inclined walls 65 and 66 of the upper half body 60. These side walls 64A are the lower half 10
It is slidably inserted in the guide gap between the inner and outer walls 16A and 11A. In the widthwise center of the outer surface of the left and right side walls 64A,
A plurality of step portions 63 extending in the horizontal direction are formed in the vertical direction. In either of the recesses of these steps 63, the lower half 10
The upper half 60 is supported and the height position thereof is determined by the claw 13B of the stopper 13 provided on the upper side entering and engaging.

A rear wall 64B is provided on the rear surface of the upper half body 60, and the rear wall 64B extends along the outside of the rear wall 16B of the lower half body 10. No front wall is provided on the front surface of the upper half body 60. In order to prevent the entry of ambient light, it is better to provide a front wall as well.

A handle 67 used to move the upper half body 60 up and down is provided on the upper surface of the upper half body 60.

When an image of a subject is displayed on the television device 50 using such an image input device, a transparent plate is used.
23 is opened and the subject OB is placed at a position determined by the positioning frame 21 of the pedestal 20. When the object OB is placed on the pedestal 20, the transparent plate 23 is closed.

The object OB placed on the pedestal 20 is illuminated by the illumination device 41.

The light beam representing the object OB is deflected by the deflection mirrors 61 and 62 and guided to the omnifocal lens 30.
An object image is formed on the CCD 33 by the omnifocal lens 30.

A video signal representing a subject image is output from the CCD 33. The video signal output from the CCD 33 is given to the image pickup circuit 34, subjected to image pickup processing, and output. The video signal output from the image pickup circuit 34 is given to the video circuit 35 and subjected to reproduction processing. The video signal reproduced in the video circuit 35 is given to the television device 50 through the output terminal 36 and the cable. As a result, a subject image representing the subject OB is displayed on the television device 50.

The optical distance between the object OB and the omnifocal lens 30 changes as the upper half 60 approaches or moves away from the bottom surface of the lower half body 10. When the optical distance between the object OB and the omnifocal lens 30 changes, the size of the object image formed on the CCD 33 also changes, and the television device 50
The size of the subject image displayed on the screen also changes.

That is, when the optical distance between the object OB and the omnifocal lens 30 becomes long, the object image becomes small, and when the optical distance between the object OB and the omnifocal lens 30 becomes short, the object image becomes large. If the upper half 60 is held in the raised position as shown in FIG. 1, the optical distance between the object OB and the omnifocal lens 30 becomes long, so the object image becomes relatively small, and a relatively small object image is displayed on the television. It is displayed on the John device 50. As shown in FIG. 2, when the upper half body 60 is held in the lowered position, the optical distance between the subject OB and the omnifocal lens 30 becomes short, so that the subject image becomes relatively large and a relatively large subject image is displayed on the television. It is displayed on the device 50.

According to the image input device shown in FIGS. 1 and 2, zooming is performed by raising or lowering the upper half body.
It becomes possible to make a subject image small or large without using a lens.

As shown in FIG. 2, when the image input device is stored, the size of the image input device can be reduced by lowering the upper half body 60, which is convenient for transportation and storage.

FIGS. 3, 4 and 5 show another embodiment of the present invention. 3 is a longitudinal sectional view of the image input device when it is stored, FIG. 4 is a front view of the image input device when it is stored, and FIG. 5 shows a state when the image input device is used. FIG. 3 is a vertical sectional view of the image input device.
In these figures, the same parts as those in FIG. 1 and FIG.

Referring to FIG. 3, a base 81 is formed parallel to the bottom surface 88 of the cabinet 80 at a predetermined height from the bottom surface 88. A pedestal 120 is housed between the base 81 and the bottom surface 88.

The pedestal 120 is for placing a subject OB which projects a subject image on a television device when used as an image input device. A handle 121 is formed at one end of the pedestal 120. Holding this handle 121, the pedestal 120 is pushed into the cabinet 80 to enter the cabinet 80, and is pulled out from the cabinet 80 to exit the cabinet 80. Protrusion 122 on the other end of pedestal 120
Are formed. The protrusion 122 controls the withdrawal of the pedestal 120. A protrusion 84 is formed at one end of the base 81 for restricting the withdrawal of the pedestal 120. Pedestal 12
As you pull 0 out of cabinet 80,
2 and the protrusion 84 of the base 81 collide with each other, and the withdrawal of the pedestal 120 is restricted. This prevents the pedestal 120 from coming off the cabinet 80.

Inside the cabinet 80, a lens holding member 93 is provided on the right side. Lens holding member
93 is supported by the support arm 98 on the inner wall of the cabinet 80. The lens holding member 93 is a substantially rectangular column and has a hollow interior.
Are arranged. A rack 91 is fixed to the right side surface of the lens barrel 30 of the all-focus lens. As the rack 91 moves up and down, the omnifocal lens 30 also moves up and down.

The image input device is provided with an adjusting knob 94 for moving the omnifocal lens 30 up and down. The adjusting knob 94 has a connecting rod 95, and a gear 96 is fitted to one end of the connecting rod 95. This gear 96 and rack 91 teeth 92
And are in mesh. Therefore, by rotating the adjusting knob 94, the rack 91 moves up and down, and the omnifocal lens
30 moves up and down.

An elastic body 99 such as rubber is fixed inside the lens holding member 93. The elastic body 99 holds the all-focus lens barrel 30 by its elastic force. Elastic body
By turning the adjustment knob against the force of 99, the lens barrel 30 of the all-focus lens moves up and down.

The lens barrel 30 of the all-focus lens has a C on its image plane.
CD33 is fixed.

A substrate 32 is supported on a base 81 by a substrate mounting support 31. An image pickup circuit 34 and a video circuit 35 are arranged on the substrate 32. The video signal output from the CCD 33 is given to the image pickup circuit 34 and the video circuit 35, and an image pickup process and a reproduction process are performed.

Inside the cabinet 80 of the image input device,
An illumination device 111 for illuminating an object OB placed on a pedestal 120 that has exited from the cabinet 80 is provided.
The lighting device 111 is supported by the support member 110.

On the left side surface of the cabinet 80, there is provided a roof 114 which moves around a shaft 118 in an arc shape at a predetermined angle. The roof 114 has cutouts 116 and
117 is formed.

A stopper 101 is provided on the upper surface of the cabinet 80.
Is pivotally mounted by a shaft 102b fixed to a bracket 102a. An operation piece 101A is formed at a position on the right side of the shaft 102b of the stopper 101.
A claw 101B is formed on the left side of the stopper 101.

When the roof 114 is lifted about the shaft 118, the claws 101B of the stopper 101 enter the notches 116 of the roof 114. This allows the roof as shown in Figures 4 and 5
114 is held at a predetermined angle.

As shown in FIGS. 4 and 5, the engaging portion 131 of the light shielding plate 130 is inserted into the notch 117 at the other end of the roof 114 when the image input device is used.

Referring again to FIG. 3, an opening 85 is formed on the left side surface of the cabinet 80. The transparent plate 113 is fitted in the opening 85.

The upper right corner of the cabinet 80 is the cabinet 80
Is obliquely formed, and the deflection mirror 100 is fixed inside the inclined wall 86. A deflection mirror 115 is also fixed inside the roof 114. By the deflecting mirrors 115 and 100, as shown in FIG. 5, the light rays from the object OB placed on the pedestal 120 pulled out from the cabinet 80 are guided to the lens barrel 30 of the all-focus lens.

Referring to FIG. 4, a door 89 is provided on the side surface (front surface and rear surface in FIG. 3) of cabinet 80. The door 89 is held by a hinge 87 so that it can be opened and closed.

In the image input device shown in FIGS. 3 to 5, the roof 114 is closed and the pedestal 120 is housed in the cabinet 80 when housed, as shown in FIG.

When the image input device is used, the roof 114 is opened and the pedestal 120 is opened as shown in FIGS.
Is pulled out of the cabinet 80. Pedestal pulled out
A subject OB is placed on 120. This makes the subject OB
A beam of light is guided through deflection mirrors 115 and 100 to omnifocal lens 30.

Further, the engaging portion 131 of the shading plate 130 is inserted into the notch 117 at the other end of the roof 114, and the shading plate 130 is leaned against. The door 89 is closed again. As a result, the inside of the image input device is shielded, and the subject OB is not affected by the light from the outside, and is illuminated only by the illumination of the illumination device 111.

The light beam from the object OB is guided to the omnifocal lens 30. The position of the omnifocal lens 30 is adjusted by the adjustment knob 94. When the adjusting knob 94 is turned, the lens barrel 30 of the omnifocal lens moves up and down. When the lens barrel 30 of the omnifocal lens moves up and down, the distance between the subject OB and the lens barrel 30 of the omnifocal lens changes, and the size of the subject image also changes. For example, if the adjustment knob 94 is turned so that the omnifocal lens 30 descends, the distance between the object OB and the lens barrel 30 of the omnifocal lens becomes long, and the image of the object becomes small. On the other hand, when the adjusting knob 94 is turned so that the lens barrel 30 of the all-focus lens is raised, the object O
Since the distance between B and the omnifocal lens 30 becomes short, the image of the subject becomes large.

Further, since the subject OB is not affected by external light, a subject image of proper brightness is always displayed on the television device 50.

[Brief description of drawings]

FIG. 1 is a front view of an image input device when an upper half is raised.

FIG. 2 is a front view of the image input device when the upper half is lowered.

FIG. 3 is a vertical cross-sectional view of the image input device according to another embodiment when it is stored.

FIG. 4 is a perspective view of an image input device.

FIG. 5 is a vertical cross-sectional view of the image input device, showing a state when the image input device is used.

[Explanation of symbols]

10 Lower half 20 pedestal 30 All-focus lens barrel 33 CCD 60 Upper half 61,62 Deflection mirror

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Claims (4)

(57) [Claims] 1. A box body composed of a lower half body having an open upper surface and an upper half body covering an upper surface opening of the lower half body, wherein the lower half body has a pedestal on which a subject is placed, An all-focus lens that forms a subject image based on an incident light beam regardless of the optical distance to the subject placed on the pedestal, and an imaging device that outputs a video signal representing the subject image formed by the all-focus lens are provided. , The upper half is vertically movable along the side wall of the lower half, and is held at a predetermined height position. Further, the upper half is focused on all the reflected light rays from the subject. Image input device equipped with a deflection mirror that guides the lens. 2. The lower half body and the upper half body are made of a light shielding material, and the lower half body or the upper half body is further provided with an illuminating device for illuminating an object placed on the pedestal. The image input device according to claim 1. 3. The box, which can be stored in a box,
A drawable out of the body, though the optical distance to the object that is placed pedestal for placing the object, setting vignetting within said box body, to pull out the seat out of the box body not, on the position of the entire lens to change the optical distance between the all-focus lens, the object and the entire focus lens placed in the pedestal forms the subject image based on the incident light
A lens moving mechanism for moving the lens downward, an image pickup device provided in the box body for outputting a video signal representing a subject image formed by the omnifocal lens , and above the pedestal pulled out from the box body. Box
It is installed so that it can be stored in the
On the pedestal pulled out from the above box by being held
The reflected light from the subject placed on the
The first deflection mirror that guides the first part and the first deflection mirror that is kept in the state of being taken out from the box body.
The holding member to hold and the inside of the box body,
The reflected light beam deflected by the first deflection mirror is
An image input device provided with a second deflecting mirror for guiding to the all-focus lens . 4. The light shielding plate for shielding the subject placed on the pedestal, which is taken out of the box, and the subject placed on the pedestal, which is taken out of the box. The image input device according to claim 3, further comprising: an illumination device that illuminates the.