JPH0511361A - Image projector - Google Patents

Abstract

PURPOSE:To provide an image projector whose constitution is simple and, in addition, which is capable of accurate focusing without the need of an extra tool. CONSTITUTION:In an image projector 60 composed of an image projecting means projecting optically the image placed under a film and a screen unit 61b provided with an mirror reflecting the film image from the image projecting means and a condenser lens 67 for collecting the film image reflected by the mirror, the screen unit 61b is provided with an auxiliary screen 70a which focuses the film image from the image projecting means. In this constitution, accurate focusing can be performed without the need of an extra tool.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an image projection apparatus for projecting a film image such as a slide film (positive film) or a negative film and providing it to an image reading means such as a copying machine.

[0002]

2. Description of the Related Art Conventionally, when copying a film image using a copying machine, an image projection device (film adapter) is used. This image projection apparatus is a projector unit that irradiates light from a light source onto a film that is slidably mounted on a unit body and projects a film image, and a document table of a copying machine or the like that reflects the film image from the projector unit. And a screen unit for forming an image on the screen.

There are automatic and manual means for adjusting the focus (hereinafter also referred to as "focus") of a film image in such an image projection apparatus.

In the automatic type, a focus automatic adjustment mechanism is provided in the projector unit. In the case of the manual type, place the paper or plastic plate at the position where the focus of the projected image is actually focused in the actual use state, and adjust the projection lens manually while looking at the reflected projected image to adjust the focus. Is going.

[0005]

However, in the above-mentioned automatic type, there is a problem that an automatic focus adjustment mechanism must be provided in the projector unit, resulting in an increase in cost and an increase in size of the apparatus. Further, in the case of the manual type, it is necessary to prepare tools such as paper and a plastic plate, and it is difficult to accurately focus due to wrinkles of the paper, warp and thickness of the plastic plate, etc. There is. Further, if these tools are lost or left behind, the focusing work cannot be performed. Therefore, it is an object of the present invention to provide an image projection apparatus having a simple configuration and capable of performing a proper focus adjustment without the need to separately prepare a tool.

[0006]

SUMMARY OF THE INVENTION The present invention is directed to image projection means for optically projecting an image on a film, a mirror for reflecting the film image from the image projection means, and a film image for reflection by the mirror. In the image projecting device comprising a screen unit having a condenser lens for condensing the light, an auxiliary screen for focusing the film image from the image projecting means is provided in the screen unit.

[0007]

According to the image projecting apparatus having the above-mentioned structure, since the screen unit is provided with the auxiliary screen for focusing the film image from the image projecting means,
It is not necessary to provide an automatic focus adjustment mechanism in the image projection means,
In addition, it is not necessary to prepare a special tool, and it is possible to perform a proper focus adjustment simply by facing the auxiliary screen to the image projection means.

[0008]

EXAMPLES Examples of the present invention will be described below.

FIG. 1 shows an image projecting apparatus 60 of the present embodiment and a copying machine 1 to which the image projecting apparatus 60 is attached for film copying.

The image projecting device 60 is a main body 1a of the copying machine 1.
A projector unit 61a as an image projecting unit arranged on one side of the main body 1a and a screen unit 61b arranged on a document table (transparent glass) 2 provided on the upper surface of the main body 1a.

The projector unit 61a is shown in FIG.
As also shown in FIG. 3, the film image is projected toward the screen unit 61b, and a box-shaped unit main body 60a is provided. The unit main body 60a is held by a film holder (film carrier) 71. A light source 62 for irradiating the formed film F with light, a condenser lens 63 for condensing, a carrier receiver 64 for supporting the film holder 71, and a spiral screw mechanism 5 shown in FIG.
5 and a lens 65 whose focal position is held by a lens barrel 65a which is displaced in the direction of the optical axis L by 5. In addition, the standard distance between the film holder 71 supported by the carrier receiver 64 and the lens 65 is shown in FIG.
It is set to x as shown in FIG.

Further, as shown in FIG. 12, a scale 56 is attached to the outer peripheral portion of the lens barrel 65a, and
The letters "negative", "thick mount", and "thin mount" are attached to the side surface of the unit main body 60a, and the lens barrel 65 is rotated according to the type of the film holder 71 to change the focal position of the lens 63.

The screen unit 61b is shown in FIG.
As shown in FIG. 3, it is configured in a rectangular parallelepiped box shape, and has a first lid 69 that can be opened and closed on the upper right side thereof and a second lid 70 that can also be opened and closed on the upper left side thereof. .. A mirror 66 for reflecting the film image from the projector unit 61a is arranged on the inner surface of the first lid 69. An auxiliary screen 70a for focusing is provided on the upper surface of the second lid 70.

Further, the screen unit 61b
Is a condenser lens (Fresnel lens) 67 that corrects the unevenness of light distribution of the film image reflected by the mirror 66 at a position facing the mirror 66, and collects the film image, and a screen on which the film image is projected. 68 are arranged.

Then, the projector unit 61a
When sending the film image from the first to the image reading means 3 of the copying machine 1 which will be described later, as shown in FIGS.
The lid 69 is opened upward by about 45 degrees, and when the film image is focused, the first lid 69 is closed and the second lid 70 is opened as shown in FIGS. As shown in FIG. 4, the auxiliary screen 70a faces the projector unit 61a in a vertical arrangement by opening 90 degrees.

In this case, as shown in FIG. 8, the position of the auxiliary screen 70a is set so as to be equal to the distance a at which the optical axis L hits the mirror 66 and reaches the original table 2 described later. Then, the same image as the original film image (upside down as shown in FIG. 8) is displayed on the auxiliary screen 7.
It becomes possible to perform focus adjustment by projecting onto 0a.
The screen unit 61b may be replaced by a screen unit 61c shown in FIGS. 6 and 7. The screen unit 61c includes the second lid 7
The screen unit 61b is different from the screen unit 61b in that 0'has a vertically divided two-division structure and an auxiliary screen 70b having a two-division structure is provided on the upper surface thereof.

An auxiliary screen 7 having such a two-division structure.
0b can be used to project the entire film image, and the lid 70 'having a two-divided structure can be folded in half and housed inside the screen unit 61b to reduce the length of the screen unit 61c. can do.

FIG. 9 shows a film holder 71 for sliding, which has a structure in which the film F is held by a substantially square frame portion 75.

FIG. 10 shows a film holder 71 for a negative film.

FIG. 13 shows a case in which the focus position of the optical system of the image reading means 3 of the copying machine 1 is adjusted to the projected image plane α, and FIG. 14 shows the optical system of the image reading means 3 of the copying machine 1 unchanged. The figure shows a case where the lens 63 of the projector unit 61a is adjusted as it is and the focus position is aligned with the projection symmetry plane α. In the former case, the position of the lens 9 of the image reading means 3 may be adjusted, and in the latter case, the lens 63 of the projector unit 61a may be adjusted.

Next, the copying machine 1 will be described with reference to FIGS.
This will be described with reference to FIG.

The copying machine 1 is of a thermal transfer type capable of selectively producing multicolor color copies.

That is, an operation panel (not shown) is provided on the front portion of the upper surface of the main body 1a. And the main body 1a
An image reading unit 3 that scans and reads the document O set on the document table 2 is provided at the upper part of the table, and an image forming unit 4 is provided at the lower part. Reference numeral 5 denotes a document cover provided on the document table 2 so as to be openable and closable. The original table 2 is fixed to the main body 1a.

The image reading means 3 is constructed as shown in FIGS. That is, the illumination lamp 6 as a light source
The reflected light from the first carriage 7 in which the optical path is bent by the first carriage 7 and the mirrors 8a and 8b, the lens 9, and the reflected light from the original O are guided to the photoelectric converter 11 described later, and the optical path length is corrected during zooming. The mirror unit 10, a photoelectric converter (conversion unit) 11 that receives the reflected light from the document O, and a drive system (not shown) that changes the position of each unit.

The first carriage 7 has an illumination lamp 6 for irradiating the original O with light, a reflector 12 as a reflecting mirror for collecting the light from the illumination lamp 6 on the original surface, and the original O.
Mirror 13 that guides the reflected light from the second carriage 8 side
Is installed.

The second carriage 8 is equipped with mirrors 8a and 8b for guiding the light guided by the mirror 13 to the lens 9. The first and second carriages 7 and 8 are
The second carriage 8 is connected to each other with a timing belt (not shown), and the second carriage 8 moves in the same direction at half the speed of the first carriage 7. As a result, scanning can be performed so that the optical path length to the lens 9 is constant.

The lens 9 has a fixed focal length and is moved in the optical axis direction during zooming. Further, a lens having a variable focal length such as a zoom lens may be used.

The mirror unit 10 includes two mirrors 10a,
10b, the positions of the mirrors 10a and 10b are changed in accordance with the change of the optical path length corresponding to the selected magnification, and the light from the lens 9 is reflected by the two mirrors 10a and 10b. By bending the optical path, the light is guided to the photoelectric converter 11.

The photoelectric converter 11 photoelectrically converts the reflected light from the original O to convert the image of the original O into C (cyan), G (green), Y (yellow) or R (red), G (. The color signals of green and B (blue) are separately output as color signals, and are mainly composed of, for example, a CCD type line image sensor. In this case, the original O
3 pixels (C,
G, Y or R, G, B). The output of the photoelectric converter 11 is output to an A / D converter 91 described later.

The movement of the first and second carriages 7 and 8, the lens 9 and the mirrors 10a and 10b is performed by a stepping motor (not shown).

The mirrors 10a and 10b and the lens 9
Are moved by different stepping motors (not shown). The lens 9 is
A spiral shaft (not shown) is rotated by a corresponding stepping motor and is moved in the optical axis direction by the movement of the spiral.

The image forming section 4 is constructed, for example, as shown in FIG. That is, the platen drum 22 is arranged at a substantially central portion of the image forming unit 4.

The periphery of the platen drum 22 is made of an elastic material such as rubber and has a function as a platen roller of the thermal head 24. The platen drum 22 itself rotates counterclockwise to wind the paper P as an image forming medium around the outer circumference of the paper P so that the paper P does not shift during overlay printing. A pressure roller 2 is provided around the platen drum 22 to prevent the paper P from floating above the platen drum 22 at predetermined intervals.
5 are provided. The circumference of the platen drum 22 is slightly longer than the length of the maximum paper size in the longitudinal direction.

A thermal head 24 as an image forming means is arranged on the lower left portion of the platen drum 22. The thermal head 24 is attached to a radiator integrally formed on the rear end surface of the holder. An ink ribbon 26 as an image forming medium is interposed between the platen drum 22 and the thermal head 24.

Cores 30, 31 of the ink ribbon 26
Is connected to a drive shaft of a motor (not shown) via a drive force transmission mechanism (not shown), and is rotationally driven as necessary.

A paper feed roller 41 is provided below the main body 1a so as to take out the paper P as an image forming medium housed in the paper feed cassette 20 one by one. The paper P taken out by the paper feed roller 41 is
The transfer roller 42 transfers the platen drum 22 to the upper left of the transfer roller 42, and the gripper 23 mounted along the axial direction of the platen drum 22,
It is wound around the platen drum 22 by the pressure roller 25, and is in a gripped state, so that it is fed accurately.

The paper feed cassette 20 is detachable from the side surface of the main body 1a. Incidentally, 46 in FIG.
Is a manual paper feeding device for manually feeding the paper P and the like. The sheet P supplied from the manual sheet feeder 46 is also wound around the platen drum 22 in the same manner as above.

The paper P, the front end of which is fixed by the gripper 23, is wound around the platen drum 22 by the counterclockwise rotation, and after the front end passes through the print area of the thermal head 24, the thermal head 24 is moved to the platen drum 2.
The pressure is increased to 2 and printing is performed.

When the printing of the first color is completed, the platen drum 22 is rotated almost once. here,
The thermal head 24 is once released, and the ink ribbon 26
Is wound up and the next color is cued. Then, the platen drum 22 starts rotating in the clockwise direction, printing is performed by the thermal head 24, and the next color is overprinted (printed).

Thus, in the case of full color copying,
4 times yellow, magenta, cyan, black, or
Image formation is performed by three operations of yellow, magenta, and cyan. In the case of a single color such as black, the operation is performed once.

When the sheet is discharged, the platen drum 22 is rotated counterclockwise until the trailing edge of the sheet P reaches the sheet discharge guide 27, and when it reaches, the platen drum 22 is rotated clockwise. The trailing edge of the sheet P is separated from the platen drum 22 by a separation claw (not shown) and is guided to the sheet discharge guide 27. Finally, the front end of the paper P is released from the gripper 23, and the paper P, which has been copied by the paper ejection guide 27, is ejected onto the paper ejection tray 28.

Next, the control system of the copying machine 1 will be described with reference to FIG.

The copying machine 1 has a main controller 81, a first sub controller 82 and a second sub controller 83. Main controller 81
Is an operation panel 80, a memory 99, a correction circuit 84, a luminance / color difference separation circuit 85, an image quality improvement circuit 86, a color signal conversion circuit 87, a binarization circuit 88, a first sub control unit 82, and a second sub control unit 83. They are connected to each other and control these. The first sub control unit 82 is connected to the light source control unit 89, the motor driving unit 90, the photoelectric converter 11, the A / D converter 91, and the resolution converting unit 92, and controls these components. The light source control unit 89 is connected to the illumination lamp 6,
The lighting control and the light amount control are performed. That is, the illumination lamp 6 is turned on during a normal image reading operation.

The motor drive unit 90 drives the scanning motor 18.

The second sub-control unit 83 controls the thermal head temperature control unit 93 and the thermal head 24, and also connects the drive unit 95 for driving the drive system 96 of the platen drum 22 and the detection switch 94. ..

Next, the operation of the image projection device 60 having the above-mentioned configuration will be described.

To form a film image from the projector unit 61a on a document table 2 of a copying machine 1 which will be described later, and to read it by the image reading means 3, as shown in FIGS. 69 is opened upward by about 45 degrees so that the mirror 66 faces the projector unit 61a.

When focusing the film image, as shown in FIGS. 4 and 5, the first lid 69 is closed and the second lid 70 is opened 90 degrees as shown in FIG. The auxiliary screen 70a is vertically arranged to face the projector unit 61a. Then, as shown in FIG. 8, the position of the auxiliary screen 70a is changed to the optical axis L.
The same image as the original film image by standing up so as to be equal to the distance a which reaches the document table 2 described later after hitting the mirror 66 (apparently upside down as shown in FIG. 8).
It is possible to adjust the focus by projecting the image on the auxiliary screen 70a.

As described above, according to the image projection device 60, the auxiliary screen 70a is arranged at the position corresponding to the position where the original focusing is performed, so that it is not necessary to separately prepare a tool for focus adjustment. Further, the auxiliary screen 70a can be used as a precision map for focus adjustment.

Since the auxiliary screen 70a has a simple structure and is easy to operate, it is not necessary to provide an automatic focus adjusting mechanism in the projector unit 61a, and the cost and size of the apparatus can be reduced. ..

Of course, various modifications can be made without departing from the spirit of the invention.

[0052]

As described above in detail, according to the present invention,
With the above-described configuration, it is possible to provide an image projection device having a simple configuration and capable of performing a proper focus adjustment without the need to separately prepare a tool.

[Brief description of drawings]

FIG. 1 is a perspective view of an image projection apparatus and a copying machine that are embodiments of the present invention.

FIG. 2 is a perspective view of a screen unit according to an embodiment of the present invention.

FIG. 3 is a perspective view of the screen unit according to the embodiment of the present invention with the first lid opened.

FIG. 4 is a perspective view of the screen unit according to the embodiment of the present invention with a second lid opened.

FIG. 5 is a side view of the screen unit according to the embodiment of the present invention with the second lid opened.

FIG. 6 is a perspective view of another example of the screen unit according to the embodiment of the present invention.

FIG. 7 is a side view of another example of the screen unit according to the embodiment of the present invention.

FIG. 8 is an explanatory diagram showing an optical system of an image projecting apparatus and a copying machine according to an embodiment of the present invention.

FIG. 9 is a perspective view showing an example of a film holder.

FIG. 10 is a front view showing another example of the film holder.

FIG. 11 is a plan view showing a projector unit in the embodiment of the invention.

FIG. 12 is a front view showing a projector unit according to the embodiment of the invention.

FIG. 13 is an explanatory diagram showing a projection state of a film image.

FIG. 14 is an explanatory diagram showing a projection state of a film image.

FIG. 15 is a schematic sectional view of a copying machine.

FIG. 16 is a block diagram showing a control system of a copying machine.

[Explanation of symbols]

 60 image projection device 61a projector unit 61b screen unit 62 light source 66 mirror 70a auxiliary screen

Claims (1)

Claim: What is claimed is: 1. An image projection means for optically projecting an image on a film, a mirror for reflecting the film image from the image projection means, and a film image for reflection by the mirror. An image projecting device comprising a screen unit having a light-collecting lens, wherein the screen unit is provided with an auxiliary screen for focusing a film image from the image projecting means.