JP2579582B2 - Exposure device of electroprocessed grayscale photo reproduction device and electroprocessed grayscale photoreproduction 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 exposure control device for an electro-processed gray-scale photograph reproducing apparatus. More specifically, the present invention relates to an exposure control device that can prevent unnecessary exposure of a film held by a film holding unit.

[0002]

2. Description of the Related Art Conventionally, an exposure apparatus shown in FIGS. 8 to 12 has been used in an electro-processed gray scale photograph reproducing apparatus (hereinafter referred to as a photograph reproducing apparatus).

In the exposure apparatus shown in FIG. 8, a condensing lens and a reflecting mirror MR for deflecting the optical path from the condensing lens by 90 degrees at the tip of the rotating shaft are provided on the center axis of the semi-cylindrical body for holding the film. An optical system composed of a scan motor M1 is disposed, and a laser beam from a laser optical processing system is irradiated on a condenser lens of the optical system via reflection mirrors M1 and M2, thereby forming a half-cylinder for holding a film. Exposure has been made to a film held on the body surface. The exposure in the circumferential direction of the film is performed by rotating the reflection mirror MR. Exposure in the longitudinal direction of the film (in the direction of the center axis of the semi-cylindrical body) is performed by suspending the optical system on a stretched infinite belt and moving the infinite belt by a scan motor M2. The entire film is exposed.

FIGS. 9 and 10 show the scan motor M.
FIG. 9 shows a case in which the rotating shaft is rotated in a fixed direction, and FIG. 10 shows a case in which the rotating shaft is reciprocated (oscillated) in a fixed range. Therefore, the laser beam from the condenser lens makes a circular motion in the case of FIG. 9 and a reciprocating circular motion in the case of FIG.

In the exposure apparatus shown in FIG. 11, a laser beam deflected by a galvano scanner onto a film wound on a drum is further deflected by an fθ lens, thereby exposing the film in the longitudinal direction. By rotating the drum around which is wound, exposure in the circumferential direction is performed. In the exposure apparatus shown in FIG. 11, the entire film is exposed in this manner.

In the exposure apparatus shown in FIG. 12, a laser beam deflected by a galvano scanner to a film sandwiched between rollers is further deflected by an fθ lens, thereby exposing the film in the width direction, and the film is exposed. By rotating the sandwiched rollers, the film is exposed in the vertical direction, thereby exposing the entire film.

However, the exposure apparatus shown in each of the drawings has the following problems, and further improvement is demanded.

If an image having no practical problem is to be obtained by using the exposure apparatus shown in FIG.
When a film of mx350 mm is used, it is necessary to keep the error of the axis parallelism of the optical system on the film surface at 1 μm or less and the change of the moving speed of the optical system at 1 μm / sec or less. For this purpose, it is necessary to suppress the elongation of the infinite belt on which the optical system is suspended to 1 μm or less and to keep the friction between the part driving the infinite belt and the infinite belt constant. However, the optical system including the condenser lens, the scan motor M1, and the reflection mirror MR has a considerable weight, and also has inertia due to the rotation of the scan motor M1 and the reflection mirror MR. Therefore, there is considerable difficulty in maintaining infinite belt elongation and friction as described above. Therefore, in the exposure apparatus shown in FIG. 8, maintenance is frequently performed for adjusting the tension of the belt.

In the exposure apparatus shown in FIG.
When the scan motor M1 is driven by the method shown in (1), if the size of one pixel is 100 μm × 100 μm, the number of lines is 4500 (450 mm / 100 μm)
Becomes Here, assuming that the exposure time of the entire film is 10 seconds, the exposure time per line is about 2.2 milliseconds (1
0 seconds / 4500 lines). Further, if the exposure is performed by 1/3 of the portion where the laser beam is rotated,
The time required for one rotation of the scan motor MR is about 6.6 milliseconds. That is, it is necessary to make about 151 rotations per second. When this is converted into RPM, it becomes 9060 RPM. Therefore, according to the method of FIG.
In addition to the problem that rotating 1 requires rotating at a high speed of 9000 RPM, 1 /
There is also the essential disadvantage that only three are available.

Further, when the scan motor M1 is driven by the method shown in FIG. 10, inertia due to reciprocation is generated, so that it is more difficult to ensure accuracy. In addition, there is also an essential disadvantage that only half of the operating portion can be used because exposure is performed on the forward path and not performed on the return path due to reciprocation.

When the exposure apparatus shown in FIG. 11 is used,
Attaching a polyhedral mirror to the tip of the rotating shaft of the scanner motor can almost eliminate the above-mentioned problem. However, a film using a nitrocellulose film or polyester film having a thickness of 0.15 mm as a base material is wound around a drum. To make a circle, it is necessary to completely press both ends of the film. Therefore, there is a problem that the pressed portion cannot be exposed, and the effective use area of the film decreases. In addition, since the unexposed portion becomes white after development, there is a problem that the image photographed on the film becomes difficult to see.

When the exposure apparatus shown in FIG. 12 is used,
As with the apparatus shown in FIG. 11, there is no problem as in the apparatus shown in FIG. 8, but in order to obtain an image having no practical problem, it is necessary to uniformly feed the film with a roller.
For this purpose, it is necessary to make the thickness of the film uniform and to make the thickness of the roller and the sandwiching load by the roller uniform. However, the thickness of the film is uneven, and it is difficult to make the roller diameter uniform because of the processing accuracy of the roller, and it is difficult to hold the film with a uniform clamping force because of the manufacturing accuracy of the bearing. Furthermore, when the film is clamped by rollers, it elastically deforms,
The deformation does not occur evenly. For this reason, there is a problem that an image with a desired accuracy cannot be obtained because one-sided feeding occurs and minute unevenness occurs on the film surface in the film fed by the roller.

In the exposure apparatus shown in FIGS. 11 and 12, since the wind due to the rotation of the polyhedral mirror is reflected from a wall or the like inside the exposure apparatus and collides with the polyhedral mirror irregularly, the rotation axis is irregular. And the image is distorted,
There is also a problem that a special correction mechanism is required to correct the image disturbance.

In view of the problems of the prior art, the present inventors have already developed a light projecting means (for example, a laser device), a rotating polyhedral reflecting means (for example, a polygon mirror), and a light deflecting / condensing means (for example, fθ). A lens), an optical system holding means, a rotating means, and a film holding means, wherein the light projecting means irradiates a parallel light beam, and the rotating polyhedral reflecting means emits the parallel light beam from the light projecting means. The light is reflected by the film held by the film holding means via a light deflecting / light collecting means, and the optical system holding means moves the light projecting means, the rotating polyhedral reflecting means, and the light deflecting / light collecting means. Holding integrally, the film holding means has a film holding surface formed in an arc shape, and the turning means turns the optical system holding means in a predetermined range, whereby the film holding surface Held Predetermined range of Irumu has proposed an exposure apparatus pictures reproducing apparatus characterized by comprising been exposed (1992 Patent Application No. 303,104).

In the exposure apparatus of this photographic reproducing apparatus,
In order to facilitate position adjustment of the rotating polyhedral reflecting means and the film holding means, the exposure range of one reflecting member of the rotating polyhedral reflecting means is set wider than the width of the film held by the film holding means. .

Therefore, unless the irradiation from the light projecting means is properly adjusted, the film is subjected to unnecessary exposure by the reflected light from the film holding means and the like.

[0017]

SUMMARY OF THE INVENTION The present invention solves the above-mentioned problem in the exposure apparatus of the photographic reproducing apparatus which has already been proposed by the present inventors. It is an object of the present invention to provide an exposure control device of a photographic reproducing apparatus which can perform a predetermined exposure on a desired area of a film without performing exposure.

[0018]

SUMMARY OF THE INVENTION The present invention provides a light projecting means,
A rotating polyhedron reflecting unit, a light deflecting / condensing unit, an optical system holding unit for holding an optical system including the light projecting unit, the rotating polyhedral reflecting unit, and the light deflecting / condensing unit; An exposure control apparatus for an electro-processed gray scale photograph reproduction apparatus, comprising: a rotating means for moving; and a film holding means having a film holding arc surface, wherein the exposure control apparatus comprises: a first light detection means; Two light detecting means, a position detecting means for the rotating polyhedron reflecting means, and a posture detecting means for the rotating means, wherein the first light detecting means detects the intensity of the irradiation light from the light projecting means, By the second light detecting means,
The exposure start position of the film held by the film holding means is detected, and at least the front end of each reflecting member of the rotating polyhedral reflecting means is detected by the rotating polyhedral reflecting means position detecting means, and the rotating means The attitude of the rotation means is detected by the use attitude detection means, and the exposure control device detects the first light detection means, the second light detection means, the position detection means for the rotating polyhedron reflection means, and the posture detection for the rotation means. The present invention relates to an exposure control device for a photographic reproducing apparatus, wherein the light irradiation of the light projecting means is controlled based on an input signal from the means.

In the present invention, when the front end of the reflecting member of the rotating polyhedral reflecting means reaches the optical axis of the light emitting means, the exposure control device starts irradiation of the light emitting means. Irradiating light from the light emitting means,
While exposing a predetermined range of the film held by the film holding means, the intensity of the irradiation light is adjusted so as to be proportional to an image signal, and the irradiation light from the light projection means causes the predetermined range of the film to be adjusted. It is preferable that after a predetermined time elapses from the exposure, the light irradiation of the light projecting means is stopped until the front end of the next reflecting member reaches the optical axis of the light projecting means.

In the present invention, the start of the irradiation by the light projecting means, the adjustment of the intensity of the irradiation light and the stop of the irradiation are repeated following the change in the attitude of the rotating means,
Thereby, a desired area of the film is preferably exposed.

[0021]

Since the exposure control device of the photo reproducing apparatus of the present invention is constructed as described above, it is possible to form a reproduced image of an electro-processed gray-scale photograph in a predetermined area of the film and prevent unnecessary exposure to the film. You.

[0022]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described based on embodiments with reference to the attached drawings, but the present invention is not limited to only such embodiments.

FIG. 1 is a block diagram of an embodiment of the present invention, FIG. 2 is a schematic view of an exposure apparatus to which the present invention is applied, and FIG. 3 is an optical axis of the exposure apparatus and an arc-shaped film holding surface of a film holding means. FIG. 4 is an explanatory view of a positional relationship with a center of curvature (coinciding with the center of rotation) of FIG.
FIG. 5 is an explanatory diagram showing the relationship between the exposure range of the reflection member and the required exposure range of the film, FIG. 5 is a block diagram for explaining feedback control applied to the light projecting means, and FIG. FIG. 7 is a graph showing an example of exposure control according to the present invention. In the figure, 1 is an exposure control device, 2 is a first light detecting means, 3 is a second light detecting means, 4 is a position detecting means for a rotating polyhedron reflecting means, 5 is a posture detecting means for a rotating means, and 6 is an input interface. , 7 is a microcomputer, 8 is an output interface, 9
Denotes a light projecting means, 10 denotes a rotating polyhedral reflecting means, 11 denotes a rotating means, and F denotes a film.

FIG. 1 is a block diagram showing the configuration of the exposure control apparatus 1 according to an embodiment of the present invention.
The first light detecting means 2 for detecting the intensity of the irradiation light of the second direction, the second light detecting means 3 for detecting the exposure start position of the film F held by the film holding means 12, and the reflection of the rotating polyhedral reflecting means 10 The position detecting means 4 for the rotating polyhedron reflecting means for detecting the position of the member and the posture detecting means 5 for the rotating means for detecting the posture of the optical system holding means 13 held by the rotating means 11 are provided as sensors. I have. Signals from these sensors are input to the microcomputer 7 via the input interface 6. The microcomputer 7 performs an arithmetic process described later, and generates control signals to the light projecting means 9, the rotating polyhedron reflecting means 10, and the rotating means 11. The generated control signal is input to the light projecting means 9, the rotating polyhedral reflecting means 10, and the rotating means 11 via the output interface 8, and controls the operation thereof.

As the first and second light detecting means 2 and 3, for example, photodiodes are used.

As the position detecting means 4 for the rotating polyhedral reflecting means, for example, an encoder provided in a drive section of the rotating polyhedral reflecting means 10 is used.

As the attitude detecting means 5 for the rotating means, for example, an encoder provided in a drive section of the rotating means 11 is used.

As the input interface 6, the microcomputer 7, and the output interface 8, those conventionally used for microcomputer application control are preferably used. Therefore, a detailed description of the configuration is omitted. A program required for the following control operation is stored in advance in a ROM (not shown) of the microcomputer 7, and a detection result from each sensor is temporarily stored in a RAM (not shown). The microcomputer 7 also has a clock (not shown) for adjusting the control signal.

Next, the exposure control performed by the exposure control device 1 having the above-described configuration will be described with reference to FIGS.

(1) The position detecting means 4 for the rotating polyhedral reflector means that, for example, the front end of the reflecting member (the first mirror in FIG. 7) of the rotating polyhedral reflector has reached the optical axis of the light projecting means 9. Is detected, the detection result is input to the microcomputer 7 via the input interface 6.

(2) In accordance with the input signal, the microcomputer 7 generates an irradiation start signal to the light projecting means 9 based on a control program stored in the ROM in advance.

(3) The generated irradiation start signal is input to the light projecting means 9 via the output interface 8.

(4) The light projecting means 9 starts irradiation based on the input irradiation start signal (see FIG. 7).

The light emitted from the light projecting means 9 is reflected by the reflecting member of the rotating polyhedral reflecting means 10, and then reaches the film holding means 12 through the light deflecting / condensing means 14 (see FIG. 2). ). Here, the optical axis of the irradiation light is located at a position separated by a distance d from the center of curvature O of the arc-shaped film holding surface 12a of the film holding means 12 (which also coincides with the center of the rotation axis of the rotation means). Since the light does not pass through the center of curvature O, the light reaching the film holding means 12 is reflected as shown in FIG. 3 and does not return to the light projecting means 9 again. Therefore, for example, a problem of return noise does not occur in the light emitting means 9. Therefore, it is not necessary to provide a special configuration for processing the return noise.

(5) With the rotation of the reflecting member of the rotating polyhedral reflecting means 10, the irradiation light from the light projecting means 9 moves in the direction shown by the arrow in FIG. Then, when the irradiation light reaches the end Fa of the film F, the fact is determined by the second light detection means 3.
Is detected.

(6) The second light detection means 3 inputs a detection signal generated as a result of inputting the irradiation light to the microcomputer 7 through the input interface 6.

(7) When a signal is inputted from the second light detecting means 3, the microcomputer 7 inputs the signal to the light projecting means 9 by the control program stored in the ROM.
In order to irradiate light having an intensity proportional to the image signal input through the control signal, a control signal on which the image signal is superimposed is generated.

(8) The control signal generated by the microcomputer 7 on which the image signal is superimposed is input to the light projecting means 9 via the output interface 8.

(9) The light projecting means 9 adjusts the intensity of irradiation light based on the input control signal. The intensity of the irradiation light is detected by the first light detection means 2 and is fed back to the microcomputer 7 via the input interface 6. FIG. 5 is an explanatory diagram of this feedback control system.

In FIG. 5, if the amplification degree of the amplifier is A, the characteristic coefficient of the light projecting means 9 is Q, and the characteristic coefficient of the first light detecting means 2 is k, the input E _i and output G _{i of} this amplifier are Is represented by the following equation. G _i = (AQ / (1 + kAQ)) E _{i In} this equation, if Q << A, the above equation can be modified as follows. _{G i = (1 / k)} E i

Here, if the characteristic of the first light detecting means is set to be linear as shown in FIG. 6, the input E _{i is} always received from the light projecting means 9 without being affected by the characteristics of the light projecting means 9. output G _i having a proportional relationship between is obtained. Here, proportionality constant has a 1 / k, by an appropriate processing, can also be directly proportional to G _i to E _i.

(10) The microcomputer 7 counts the exposure time by a built-in clock, and checks whether or not a predetermined range of the film F has been exposed.

(11) When the microcomputer 7 confirms that a predetermined area of the film F has been exposed, the microcomputer 7 stops superimposing the image signal on the control signal to the light projecting means 9.

(12) The microcomputer 7 generates an irradiation stop signal after a lapse of a predetermined time after stopping the superposition of the image signal on the control signal to the light projecting means 9, and outputs the signal to the output interface 8.
Is input to the light projecting means 9 via.

(13) In response to the irradiation stop signal, the light projecting means 9 stops the irradiation until the next irradiation start signal is inputted (see FIG. 7).

(14) The microcomputer 7 generates a rotation start signal of the rotating means 11 to irradiate the light projecting means 9 with the next line, and inputs the signal to the rotating means 11 via the output interface 8. I do.

(15) The rotation means 11 starts rotating according to the rotation start signal. This rotation amount is detected by the posture detecting means 5 for the rotating means. The detected value is input to the microcomputer 7 through the input interface 6.

(16) The microcomputer 7 uses the detection value input from the attitude detection means 5 for the rotation means to
Is rotated by a predetermined amount.

(17) When the microcomputer 7 confirms that the rotation means 11 has rotated a predetermined amount, the microcomputer 7 sends a rotation stop signal of the rotation means 11 to the rotation means 1 via the output interface 8.
Enter 1

(18) The rotation means 11 stops rotation according to a rotation stop signal input from the microcomputer 7.

(19) The microcomputer 7 waits until a detection signal of the front end of the reflection member next to the rotating polyhedral reflecting means 10 is input from the rotating polyhedral reflecting means position detecting means 4.

When the detection signal of the front end of the reflecting member next to the rotating polyhedral reflecting means 10 is input from the rotating polyhedral reflecting means position detecting means 4, the above-described series of procedures is repeated. This is repeated a predetermined number of times to form a reproduced image of the electroprocessed grayscale photograph in a predetermined area of the film.

In this embodiment, the control system is constituted entirely by software using a microcomputer, but a part of the control system may be constituted by a wired logic circuit.

[0054]

As described above, according to the present invention, the desired range of the film held by the film holding means can be exposed, and unnecessary irradiation from the light projecting means can be prevented. Unnecessary exposure of the film held by the film holding means can be prevented by the reflected light from the means.

Further, since the optical axis of the irradiation light from the light projecting means does not pass through the center of curvature of the film holding surface, there is no influence by so-called return noise, and therefore, it is not necessary to provide a special structure for preventing return noise. .

[Brief description of the drawings]

FIG. 1 is a block diagram of one embodiment of the present invention.

FIG. 2 is a schematic view of an exposure apparatus to which the present invention is applied.

FIG. 3 shows the center of curvature of the optical axis of the exposure apparatus and the arc-shaped film holding surface of the film holding means (coincides with the center of rotation).
FIG. 4 is an explanatory diagram of a positional relationship with the maker.

FIG. 4 is an explanatory diagram showing a relationship between an exposing range of one reflecting member of a rotating polyhedral reflecting unit of the exposure apparatus and a necessary exposing range of a film.

FIG. 5 is a block diagram for explaining feedback control applied to the light projecting means.

FIG. 6 is a characteristic diagram of a first light detecting means used for the feedback control.

FIG. 7 is a graph showing an example of exposure control according to the present invention.

FIG. 8 is a schematic view of a conventional exposure apparatus.

FIG. 9 is a schematic view of an example of a reflection unit used in the exposure apparatus.

FIG. 10 is a schematic view of another example of the reflection means used in the exposure apparatus.

FIG. 11 is a schematic view of another example of a conventional exposure apparatus.

FIG. 12 is a schematic view of another example of a conventional exposure apparatus.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Exposure control apparatus 2 1st light detection means 3 2nd light detection means 4 Position detection means for rotating polyhedron reflection means 5 Attitude detection means for rotation means 6 Input interface 7 Microcomputer 8 Output interface 9 Light projection means 10 Rotation polyhedron reflection means 11 Rotating means F Film

 ──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-62-292572 (JP, A) JP-A-4-130410 (JP, A) JP-A-3-206477 (JP, A) JP-A-60-1985 156032 (JP, A) JP-A-3-12627 (JP, A)

Claims (4)

(57) [Claims] 1. An optical system holding means for holding a light projecting means, a rotating polyhedral reflecting means, a light deflecting / condensing means, and an optical system comprising the light projecting means, the rotating polyhedral reflecting means and the light deflecting / condensing means. means, a rotating means for rotating the optical system holding means, an exposure device for an electric processing grayscale photographic reproduction device comprising a film holding means having a film holding arcuate surface, the light deflecting-collecting The optical axis of the light emitted from the light means is
The center of curvature of the arc-shaped film holding surface of the film holding means
An exposure apparatus for an electroprocessed gray-scale photographic reproduction apparatus, which does not pass through . 2. A first light detecting means, a second light detecting means,
And a position detecting means for the rotating polyhedral reflecting means.
At least the front end of each reflecting member of the polyhedral reflecting means is detected.
And is held by the film holding means by the second light detecting means.
The exposure start position of the film being detected is detected, and the intensity of the light emitted from the light projecting means is detected by the first light detecting means.
Degrees are detected , and each reflection unit from the position detection unit for the rotating polyhedron reflection unit is detected.
The irradiation from the light emitting means is opened by the front end detection signal of the material.
Starting the exposure of the film from the second light detecting means.
Modulation of the irradiation light intensity by the image signal
Starting, the irradiation light intensity detected by the first light detection means
2. The illumination light intensity is compensated for by :
Exposure apparatus for the electroprocessed gray-scale photographic reproduction apparatus described in the above . 3. The one reflecting member of the rotating polyhedral reflecting means.
Exposure range is held by the film holding means
It is characterized by being set wider than the width of the film
2. An exposure apparatus for an electro-processed gray scale photographic reproduction apparatus according to claim 1.
Place. 4. An exposure apparatus according to claim 1, 2 or 3,
An electro-processed gray-scale photograph reproducing apparatus, comprising: