JPH03263025A - Optical scanning device - Google Patents

Abstract

PURPOSE:To obtain a vivid image with a simple structure by providing a shutter member which is attached to an optical member so that the aperture part is opened at the time of going of the optical member and is closed at the time of returning. CONSTITUTION:An original picture means 1, a photosensitive member 2, an optical member 3 having the aperture part through which the light from the means 1 is transmitted to the photosensitive member 2, and a shutter member 10 are provided, and this shutter member is attached to the optical member 3 so that the aperture part is opened at the time of going of the optical member and is closed at the time of returning. The optical member 3 is moved back and forth to scan the original picture means 1, and the image of the means 1 is exposed to the photosensitive member 2, and exposure is performed only at the time of going of the optical member 3 because the aperture part of the optical member 3 is opened only at the time of going. Consequently, not only the aperture part is opened and closed in accordance with running of the optical member but also a driving means to open and close the aperture part is unnecessary. Thus, a vivid image is obtained with the simple structure.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an optical scanning device that is applied to hard copies of images and the like.

[Conventional technology]

As a conventional hard copy, for example, JP-A-60-81
Those described in Japanese Patent Application Laid-open No. 986 and Japanese Patent Application Laid-Open No. 63-218931 are known. This thing is a TV (video)
An image is displayed using a liquid crystal display, and the light from the display is directly printed onto a photosensitive material.

Similarly, there is also known a method described in Japanese Patent Laid-Open No. 61-215071, in which a liquid crystal panel is provided with a plurality of rows of optical shutters, and an image on the panel is printed on a photosensitive printing liquid.

[Problem to be solved by the invention]

However, in both of the former techniques, the control/arithmetic circuits are complicated, and in order to obtain a large screen, it is necessary to enlarge the liquid crystal display, which limits the screen size.

On the other hand, the latter technique uses photosensitive photographic paper, resulting in sharp images, but due to the characteristics of liquid crystals, sufficient light shielding is not possible. Further, there is a problem in blocking light from other parts during movement, and furthermore, there is a problem in that circuits such as control, arithmetic, and memory for processing image data are complicated and have a large capacity.

The present invention has been made based on such a background, and an object of the present invention is to provide an optical scanning device that can obtain clear images with a simple optical structure.

[Means to solve the problem]

In order to achieve the above object, the present invention provides an original image means fixed at a predetermined position so as to display an image and emit light from the displayed image, and a photosensitive member fixed at a position facing the original image means. an optical member having an opening for transmitting light from the original image means to the photosensitive member and capable of reciprocating between the original image means and the photosensitive member; It is characterized by comprising a shutter member attached to the optical member so that the opening opens when moving in the opposite direction and closes the opening when moving in the backward direction.

[Effect]

The original image means is scanned by the reciprocating movement of the optical member, and the image of the original image means is exposed to the photosensitive member. Since the opening of the optical member is opened only when the optical member moves in the forward direction,
Exposure is performed only in the forward direction.

Therefore, not only normal exposure but also double exposure and multiple exposure are performed under the same conditions.

〔Example〕

1 to 4 show the overall configuration of an optical scanning device to which the present invention is applied.

This optical scanning device includes an original image means 1 having an image;
A photosensitive member 2 on which an image is recorded is fixed at an opposing position, and an optical member 3 runs in parallel between the original image means 1 and the photosensitive member 2 (see Fig. 2). ).

The original image means 1 has a structure in which an image to be recorded is displayed and light is emitted from this image toward a photosensitive member 2, and is, for example, a self-luminous panel such as a transmissive liquid crystal panel or a CRT display. Alternatively, an appropriate combination of a negative film and a light source emitted to the negative film can be selected and used. On the other hand, as the photosensitive member 2, a photosensitive film sensitive to the light from the original image means 1, a photosensitive photographic paper, or a solid-state imaging device that outputs an electric signal by exposure to light is appropriately selected and used. The original image means 1 and the photosensitive member 2 are arranged to face each other, but both are fixed so as to maintain a flat state.

The optical member 3 includes such an original image means 1 and a photosensitive member 2.
The photosensitive member 2 is scanned with image light from the original image means 1 during the forward movement. In order to perform this scanning, an elongated slit 4, which is an opening, is formed in the optical member 3 in a direction perpendicular to the traveling direction.
As the optical member 3 travels, light from the original image means 1 passes through the slit 4 and reaches the photosensitive member 2.

It is necessary to prevent the photosensitive member 2 from being exposed to light from sources other than the slit 4, and for this reason, light shielding sheets 5 and 6 that move to cover the photosensitive member 2 as the optical member 3 travels are connected to the optical member 4. ing.

FIG. 5 shows the optical member 3, which includes a slider 7 through which a guide shaft 9 is inserted and moves back and forth along the guide shaft 9, and a lens array 8 installed in a through hole 7a that vertically passes through the slider 7. The slit 4 is provided so as to face the upper part of the through hole 7a.
There is. Reference numeral 14 denotes a slit plate in which the slit 4 is formed, and is fixed to the upper part of the slider 7 by screws or the like. The lens array 8 is configured so that light entering through the slit 4 is imaged on the photosensitive member 2.

Note that, as shown in FIG. 1, a pair of guide shafts 9 are arranged parallel to the running direction of the optical member 3.

The optical member 3 starts traveling in the forward direction from position A shown in FIGS. 1 and 2, and stops traveling when it reaches position B. Scanning of the image light of the original image means 1 starts at the C position between the A position and the B position, and ends at the D position. The optical member 3 that has reached position B moves in the backward direction, but during this backward movement, the slit 4 is closed to prevent the photosensitive member 2 from being exposed to light.

In FIGS. 1 to 4, reference numeral 10 denotes a shutter shaft attached to both sides of the optical member 3 in order to open and close the slit 4. This shutter shaft 10 is pulled out in the longitudinal direction of the movement of the optical member 3, and is used to open and close the slit 4 at the end of the reciprocating movement of the optical member 3. In order to open and close the slit 4, a shutter plate 17 is in contact with the lower surface of the slit plate 14, as shown in FIG. The shutter plate 17 is the shutter shaft 10
When a pressing force in the traveling direction is applied to the shutter shaft 10, it slides in the forward and reverse directions on the lower surface of the slit plate 14, and this sliding opens and closes the slit 4 of the slit plate 14. .

In FIG. 1, reference numeral 11.12 denotes a stopper disposed at both ends of the travel of the optical member 3. The shutter shaft 10 comes into contact with this stopper 11.12, and the shutter plate 17 slides, causing the slit 4 to open. Open/close switching is performed. The stoppers 11 and 12 are formed integrally with the chassis section 13 by raising and bending a predetermined position of the chassis section 13 that constitutes the machine frame of the apparatus.

For such an optical member 3, the light shielding sheet 5.6 is the fifth
As shown in the figure, one end of each optical member 3
are screwed to both sides of the lower surface of the slider 7. Also, both the left and right sides of the light shielding sheets 5 and 6 are connected to the chassis part 1.
3 and maintains a tensioned state on the photosensitive member 2. As a result, the light-shielding sheet 5.6 covers the upper part of the photosensitive member 2 in the forward and backward areas of the optical member 3 in the running direction, so that the light emitted from the original image means 1 and external light enter the photosensitive member 2. It works to prevent it from happening.

The other end of each light shielding sheet 5.6 is a free end, and storage drums 15.1 are provided at both longitudinal ends of the chassis section 13 to correspond to each light shielding sheet 5.6.
6 are inserted respectively. Also, light shielding sheet 5.6
Although it is flexible, it has both flatness returning property and curling property, and as the optical member 3 travels, each storage drum 15, 16
It is designed so that it can be drawn in and pulled out. Each storage drum 15.16 has a circularly curved inner surface, and when the optical member 3 moves to the side of the storage drum 15.16 corresponding to the light shielding sheet 5.6, this sheet 5.6 is moved to the side of the storage drum 15.16 corresponding to the shading sheet 5.6. 16 and is stored by being wound along the inner surface. The light-shielding sheet 5.6 is guided along the inner edge of the chassis portion 13, and this portion is brushed to completely shield light.

The optical member 3 is driven back and forth by a motor 20 (see FIGS. 3 and 4). In the illustrated example,
The motor 20 is installed by being inserted into the storage drum 16 in which the light-shielding sheet 6 is wound and stored.
0 installation space is not required.

A reduction gear 22 is meshed with an output gear 21 of this motor 20, and a gear portion 23 of a drive pulley 23 is connected to this reduction gear 22.
a are engaged. A driven pulley 25 is provided at the longitudinal end of the chassis portion 13 relative to the drive pulley 23, and an end-shaped belt 24 is passed around these pulleys 23, 25. The optical member 3 is attached to this belt 24
The motor 20 rotates in the forward and reverse directions, and the belt 24 runs in the forward and reverse directions, thereby traveling in the reciprocating direction.

In this case, as shown in FIG. 2, the driven pulley 25 is attached to a tension arm 26 which is rotatably biased by a spring 27, and acts to maintain the belt 24 at a predetermined tension. In FIG. 2, reference numeral 28 is a guide roller provided on the drive pulley 23 side, and as shown in FIGS. It is being The origin sensor 29 is fixed to the chassis portion 13 on the side of the belt 24 and detects the origin at which the optical member 3 starts traveling, so that the optical member 3 can start traveling from an accurate position.

This traveling of the optical member 3 must be carried out at a constant speed in order to uniformly expose the photosensitive member 2 to light. In order to perform this constant speed control, the motor 20 is a DC motor or a stepping motor equipped with a detector such as an encoder or a frequency generator.

6 and 7 show the structure of the optical member 3, and below,
The details of the optical member 3 will be explained with reference also to FIGS. 1 to 5.

As described, in the optical member 3, the shutter plate 17 and the slit plate 14 are laminated on the slider 7, and the shutter shaft 10 passes through the left and right ends. This shutter shaft 10 protrudes forward and backward in the traveling direction of the optical member 3, and is slidable relative to the slider 7. This shutter shaft 10 slides a shutter plate 17 by its slide, whereby the shutter plate 17 opens and closes the slit 4 of the slit plate 14.
7 constitutes a shutter member that opens and closes the slit.

A spacer 30 having an engagement pin 31 on the upper part is attached to the shutter shaft 10. On the other hand, both left and right ends of the slider 7 have a U-shape with a cutout in the center, and the shutter shaft 10 is attached such that the spacer 30 is located within the cutout.

Therefore, the slide of the shutter shaft 10 is caused by the spacer 3.
0 is the range that comes into contact with each opposing surface of the notch,
This contact causes the shirt flap plate 17 to stop sliding.

The shutter plate 17 is formed with an opening window 32 corresponding to the slit 4 of the slit plate 14, and engagement holes 33 into which the engagement pin 31 of the shutter shaft 10 is inserted are formed at both ends in the longitudinal direction. .

In this case, the opening window 32 is formed to be somewhat wider than the slit 4 of the slit plate 14.

This shutter plate 17 is slidably inserted between the slider 7 and the slit plate 14, and when the opening window 32 faces the slit 4 of the slit plate 14, the slit 4 is opened (FIG. 7(a)). , when the opening window 32 shifts from the slit 4, the slit 4 is closed (7th (b)
).

As will be described later, this shutter plate 17 slides to open the slit 4 when the optical member 3 travels in the forward direction, and closes the slit 4 when the optical member 3 travels in the backward direction.

Further, in order to maintain the open and closed states of the slit 4 when the optical member 3 runs, the shutter plate 17 and the slider 7 are provided with click balls 34, 34 and click holes 35, 35 that fit into each other. There is. The click ball 34 is biased from below by a spring (not shown) to fit into the click hole 35, and this fitting prevents the shirt flap plate 17 from accidentally sliding. In the illustrated example, the click ball 34 is provided on the slider 7, and the click hole 35 is provided on the shirt shirt plate 17, but the reverse may be used.

Note that the lens array 8 is provided in the through hole 7a of the slider 7.
is attached to the slit plate 14, so that the slit plate 14 is formed to be located directly below the slit 4 in a state that is considerably wider than the slit 4.

Further, at both ends of the slit plate 14 in the longitudinal direction, there are elongated holes 3 into which the engagement pins 31 of the spacer 30 are slidably inserted.
6 is formed.

Next, the operation of the above configuration will be explained.

Before the image is scanned onto the photosensitive member 2, the optical member 3 is at the initial position A, as shown in FIGS. 1 and 2.
At this initial position A, the shutter shaft 10 is at the stopper 1.
1, the opening window 32 of the shirt flap plate 17 is aligned with the slit 4 of the slit plate 14. Thereby, the slit 4 is in an open state. The original image means 1 and the photosensitive member 2 are fixed at opposing positions as shown in FIG. 2, and the original image means 1 emits light from the image to the photosensitive member 2.

When a start switch (not shown) is turned on in this state, the motor 20 starts and the belt 24 starts running. As a result, the optical member 3 travels from the A position in the forward direction (toward the B position). When the slit 4 of the optical member 3 reaches position C during this traveling, the light from the original image means 1 passes through the slit 4 and enters the photosensitive member 2, and exposure of the photosensitive member 2 to light is started. The optical member 3 is run at a constant speed, and the light from the original image means 1 is scanned onto the photosensitive means 2 by this running. When the optical member 3 reaches the D position, the scanning of the photosensitive member 2 ends, but the optical member 3 continues to travel and reaches the B position.

At this B position, the shutter shaft 10 hits the stopper 12, and the shutter shaft 10 moves in the pushing back direction. Since the engagement pin 31 of the shutter shaft 10 is inserted into the engagement hole 33 of the shutter plate 17, the shutter plate 17 slides as the shutter shaft 10 moves. This sliding causes the opening window 32 of the shutter plate 17 to shift from the slit 4 of the slit plate 14.
The slit 4 is closed (FIG. 7(b)).

In addition, in the above-described traveling of the optical member 3, since the photosensitive member 2 is covered with the light-shielding sheets 5 and 6, the photosensitive member 2 is not exposed to light from other than the slit 4. In this case, as described above, as the optical member 3 travels, the light-shielding sheet 5 is rolled into the storage drum 15, while the light-shielding sheet 6 is successively pulled out from the storage drum 16.

After the optical member 3 reaches the B position, the motor 2 is reversely driven and the optical member 3 travels in the backward direction.

When traveling in the backward direction, the slit 4 is closed by the shutter plate 17, so that the photosensitive member 2 is prevented from being exposed to light. When the optical member 3 reaches the initial position A, the shutter shaft 10 hits the stopper 11 and moves, so the shutter plate 17 slides.
The opening window 32 matches the slit 4 of the slit plate 14. As a result, the slit 4 is opened, and a standby state is entered for the next scan (FIG. 7(a)).

In this way, the shutter plate 17 opens the slit 4 when the optical member 3 travels in the forward direction, and closes the slit 4 when the optical member 3 travels in the backward direction, so that opening and closing of the slit 4 can be switched according to the traveling direction of the optical member 3. It can be performed. Moreover, the sliding of the shirt flap plate 17 is performed using the movement of the optical member 3, and a driving means is not required, resulting in a simple structure.

〔Effect of the invention〕

As explained above, in the present invention, the opening is opened when the optical member travels in the forward direction, and the opening is closed when the optical member travels in the backward direction, so that the opening can be opened and closed in accordance with the travel of the optical member. In addition, since there is no need for a driving means for opening and closing the opening, the structure can be simplified.

6 is an exploded perspective view of the optical member, and FIG. 7 is a sectional view thereof.

1... Original image means, 2... Photosensitive member, 3... Optical member, 411. Slit, 5.6... Light shielding sheet, 1
o...Shutter shaft, 11.12...Stopper, 17-...Shutter plate.

Claims (1)

[Scope of Claims] Original image means fixed at a predetermined position so as to display an image and emit light from the displayed image; a photosensitive member fixed at a position facing the original image means; an optical member having an opening that transmits light from an original image means to the photosensitive member and capable of reciprocating movement between the original image means and the photosensitive member; and the opening when the optical member moves in the forward direction. and a shutter member attached to the optical member so that the opening opens and the opening closes when the optical member moves in the backward direction.