JPS60245358A - Picture recording device - Google Patents

Abstract

PURPOSE:To record normally by starting a picture recording by the output a detecting means detecting the position of an optical beam, in a picture recording device which modulates the optical beam in accordance with a picture signal, irradiates the modulated optical beam to a recording medium, and executes a scan exposure. CONSTITUTION:When an optical beam is detected by a detector at a time t1, a clock B is generated, and counters 25, 26 start to count. After a prescribed time has elapsed, when the value of a register 22 coincides with the contents of the counter 25, a recording start signal (a) is generated at a time of t2, a flip-flop F/F27 is set, and recording is started. Thereafter, when the value of a register 23 coincides with the value of the counter 26, a recording end signal (b) is generated at a timer t3, the F/F27 is reset, and the recording is ended.

Description

[Detailed description of the invention] (Technical field) The present invention relates to a light beam scanning type image recording device.

(Prior art) Conventionally, image information is recorded by modulating a light beam in accordance with an image signal, irradiating the modulated light beam onto an information recording medium via an optical system, and scanning and exposing the information recording medium. Image recording devices are known. FIG. 1 is a block diagram showing an example of a conventional device of this type.

In the figure, 1 is a laser that emits a light beam, 2 is an optical modulator that modulates the optical beam B emitted from the laser 1 according to an image signal, and 20 is a predetermined beam that receives output light from the optical modulator 2. It is a beam expander that converts the beam size to . The beam expander 20 is composed of an optical lens 3.4, for example.

5 is a polygon mirror that distributes the transmitted light of the beam expander 20 in the main scanning direction; 6 is a motor that rotates the polygon mirror 5 at a constant speed; and 7 is an fθ lens that receives reflected light from the polygon mirror 5.

8 is an information recording medium that receives scanning light from the fθ lens 7;
For example, a film is used. , 9 is a photodetector that detects the position of the light beam, 10 is a conveyance roller that conveys the information recording medium 8 in the sub-scanning direction (winding direction), and 11.12 presses the information recording medium 8 onto the conveyance roller 9. It is a pressure roller. An overview of the operation of the device configured as described above is as follows.

A light beam B emitted from a laser 1 is modulated by an optical modulator 2 according to an image signal. The light beam is converted to a predetermined beam diameter by a beam expander 20. The converted light beam is transferred to an information recording medium 8 by a polygon mirror 5.
The light is distributed in the main scanning direction and irradiated toward the information recording medium 8 via the fθ lens 7. At this time, when the light beam hits the photodetector 9, a counter (not shown) starts counting clock signals, and when the counted value reaches a predetermined value, the light beam modulated by the image signal is transmitted to the information recording medium 8. Start irradiation. The symbol indicates the scanning line at this time. When the count value of the counter reaches a predetermined value, the light beam is turned off and the exposure operation is ended. When one line of scanning is completed, the conveyance roller 10 rotates and conveys the information recording medium 8 by one line in the sub-scanning direction (winding direction).

A new scan is then performed. The information recording medium 8 that has been scanned and exposed is developed and fixed, and predetermined image information is recorded thereon.

By the way, in conventional devices of this type, the image recording start position and the image recording end position are usually fixed, as described above. In the case of the conventional apparatus, since the image recording start position is fixed with respect to the photodetector 9, it is possible to record only on an information recording medium having a constant width in the main scanning direction. Although the recording start position can be changed by physically moving the position of the photodetector 9, the recording width cannot be changed. Therefore, if the position or size of the recording medium changes, the light beam will be irradiated onto parts other than the information recording medium, making it impossible to perform normal recording, which is extremely inconvenient.

(Object of the invention) The present invention has been made in view of the above points, and
The first purpose is to realize an image recording device that can record correctly even if the position and size of the information recording medium changes.The second purpose is to achieve information recording in addition to the first purpose. An object of the present invention is to realize an image recording device that can automatically position a medium.

(Structure of the Invention) A first invention that achieves the above object modulates a light beam according to an image signal, irradiates an information recording medium with the modulated light beam, and records an image by performing scanning exposure. The image recording device is equipped with a photodetector that detects the position of the light beam, and a counter that starts counting clock signals based on the output of the photodetector, and the count value of the counter is a first count value. The second invention is characterized in that image recording is started when the set value is reached, and the first set value can be arbitrarily varied. An image recording device that records an image by modulating the light beam, irradiating the information recording medium with the modulated light beam, and performing scanning exposure includes a photodetector that detects an arbitrary position of the light beam; It is equipped with a counter that starts counting clock signals based on the output of the detector, and a detection mechanism that detects the position and size of the information recording medium, and the recording start position is determined by the position of the information recording medium detected by the detection mechanism. and a recording end position can be set independently.

(Example) Hereinafter, an example of the present invention will be described in detail with reference to the drawings.

FIG. 2 is an electrical configuration diagram showing an embodiment of the present invention. In the figure, 21 is a data bus, 22 is a first register connected to the data bus 21 and stores the set value of a counter that determines the recording start point, and 23 is also connected to the data bus 21 and determines the recording end point. This is a second register that stores the set value of the counter. A CPU 24 is connected to the data bus 21 and performs various calculation controls. C
As the PU 24, for example, a microcomputer is used.

25 is a first counter that counts clock signals and outputs a recording start signal a when the counted value reaches the value set in the first register 22; 26 also counts clock signals and outputs the recording start signal a; The count value is in the second register 2
This is a second counter that outputs a recording end signal when the value set in step 3 is reached. These recording start signal a and recording end signal utilize the overflow signals of the respective counters 25 and 26. 27 is an RS flip-flop which is set by the recording start signal a and reset by the recording end signal @b. The output C of the flip 70 tube 27 is sent to the optical modulator 2 (see FIG. 1) and is used to control the on/off of the light beam.

The operation of the circuit configured in this way will be explained in detail with reference to the timing chart shown in FIG. In Fig. 3, (a) shows the photodetection signal of the photodetector 9 (see Fig. 1), (b) shows the clock signal obtained in synchronization with the photodetection signal, and (c) shows the recording start signal. 2) shows the recording end signal S, and (E) shows the output C of the flip-flop 27, respectively.

At time 11, when the photodetector 9 detects the light beam, the photodetector 9 generates a pulsed photodetection signal as shown in FIG. 3(a). In synchronization with the rise of this photodetection signal, a lock signal is generated as shown in FIG. 3(b). Although a circuit for generating a clock signal based on this photodetection signal is not shown in FIG. 2, it is included in the apparatus of the present invention. That is, FIG. 2 shows only the characteristic parts of the apparatus of the present invention. When the clock signal is generated, the first and second counters 25,26 start counting. At time t2, when the counted value of the first counter 25 becomes equal to the first set value stored in the first register 22, the first counter 25 is set to the value shown in FIG.
A recording start signal a as shown in FIG. The flip 70 knob 27 is set by this recording start signal a, and its output C becomes 1'' as shown in FIG. 3(e).

Furthermore, at time t3, when the count value of the second counter 26 becomes equal to the second setting value stored in the second register 23, the second counter 26 operates as shown in FIG. 3(d). Generates a recording end signal. With this recording end signal, the knob 70 and knob 27 are reset, and the output C
changes to O'' as shown in FIG. 3(E).The output signal C of this flip-flop 27 is applied to the optical modulator 2,
Controls on/off of the light beam. That is, the output signal C is “
The light beam is controlled to be on when it is 11'' and off when it is 0''.

Here, the first set value stored in the first register 22 and the second set value stored in the second register 23 are as follows:
It can be freely changed from the CPtJ 24 via the data bus 21. That is, data to be updated may be placed on the data bus 21 and stored in the register 22 or second register 23 of the rear cylinder 1.

A command to change the set value to the CPU 24 can be issued, for example, by key operation from a keyboard (not shown).

As described above, according to the present invention, the recording start position and recording end position of the information recording medium can be arbitrarily set.

Therefore, even if the dimensions of the information recording medium change, accurate recording can be performed only in the recording area of the information recording medium by simply changing the setting values stored in the registers 22 and 23 accordingly.

FIG. 4 is an electrical configuration diagram showing another embodiment of the present invention. Components that are the same as those in FIG. 2 are designated with the same numbers. In the figure, 31 is an address bus, 32 is a counter that counts clock signals, 33 is a first multiplexer that receives the address data on the address bus 31 and the output of the counter 32, and outputs either one, and 34 is the multiplexer. 33 as an address signal. The memory 34 stores in advance data that outputs a signal having characteristics as shown in FIG. 3 (E). In other words, a characteristic is stored in which the output is "'o" up to a certain address, then "1" during the image writing period, and then becomes "O" again. Alternatively, as shown in Fig. 3 (E). The characteristics shown in are reversed, that is, '1''→II OII→“
1''.In addition, the memory 34
This storage operation is performed by the CPU 24. Further, the memory 34 may be a RAM or a ROM. 35 is a second multiplexer which selects whether to output the output of the bus 34 to the data bus 21 or take it out as the output signal C.

The operation of the circuit constructed as shown in FIG. 2 is also substantially the same as that shown in FIG. That is, when a photodetection signal as shown in FIG. 3(a) is generated, a lock signal as shown in FIG. 3(b) is generated. The counter 32 starts counting the generated clock signals. The output of the counter 32 is then input to the memory 34 as an address signal via the first multiplexer 33. The memory 34 receives this address signal and outputs the data stored at the corresponding address.The stored data characteristics of the memory 34 are as shown in FIG. 3 (E) with respect to the address. If there is, the memory output will be 0'' → II every time the address changes i
1 II→II OII, and the same output signal C as shown in FIG. 3 (e) is obtained.

The characteristics of the output signal C can be easily changed by changing the data stored in the memory 34 from the CPU 24. Alternatively, this change operation can be performed by the CPU
It can also be realized by random logic without using 24.

FIG. 5 shows another embodiment of the present invention, which is provided with a detection mechanism for detecting the position and size of the information recording medium. 40 in the figure indicates the detection mechanism.

The other configurations are the same as in FIG. 2. If such a mechanism for detecting the position and size of the information recording medium is provided and the position and size information is notified to the CPU 24 via the data bus 21, the CPU 24 can automatically determine the recording start position and recording end position. It can be calculated numerically. Therefore, the operator inputs setting information regarding the position to the CPU 2 each time.
4, accurate image recording can be automatically performed according to the position and size of the information recording medium.

As such a detection mechanism, for example, as shown in FIG. 6, there is a method in which an infrared light emitting device 41 and a necessary number of optical sensors 42 that receive light from the light emitting device 41 are arranged along the main scanning direction. is possible. The point where the optical sensor 42 no longer receives light or the point where it begins to receive light becomes green on the information recording medium 8. Note that the position detection may be performed not by the method using infrared rays as described above, but by a method using air or a photographing device. The above-mentioned detection mechanism can be provided not only in the embodiment shown in FIG. 2 but also in the embodiment shown in FIG. 4.

In the above explanation, the output signal C is shown in FIG.
As shown in Fig. 2, a signal that becomes "0" only during the recording period is used, but it is not limited to this, and a negative logic signal that becomes "0" only during the recording period may also be used. A pulse may be generated only at both ends. That is, the signal may be in any format as long as it indicates that it is a recording period.

(Effects of the Invention) As described above in detail, according to the present invention, by configuring the setting values of the counters that detect the recording start position and the recording end position to be arbitrarily changed, the position and size of the information recording medium can be changed. It is possible to realize an image recording apparatus that can perform recording correctly even when the information changes, and furthermore, in addition to the above, it is also possible to realize an image recording apparatus that can automatically position the information recording medium.

[Brief explanation of drawings]

Fig. 1 shows an example of an image recording device; Fig. 2 is an electrical configuration diagram showing an embodiment of the present invention; Fig. 3 is a timing diagram showing the operation of each part; FIG. 5 is an electrical configuration diagram showing another embodiment of the present invention, and FIG. 6 is a configuration diagram showing an example of a position and size detection mechanism of an information recording medium. 1... Rede 2... Light modulator 3.4... Lens 5... Polygon mirror 6...
Motor 7... fθ lens 8... Information recording medium 9... Photodetector 10... Conveyance roller 11.12... Pressure roller 20... Two beam expanders... Data bus 22 .23...Register 24
...CPU 25.26.32...Counter 27...Flip-flop 31...Address bus 3'3.35...Multiplexer 34...Memory 40...Detection mechanism 41...Infrared rays Generator 42... Optical sensor patent applicant Roku Konishi Photo Industry Co., Ltd. Agent Patent attorney Fuji Ijima 9 ε ? N\J

Claims (3)

[Claims] (1) In an image recording device that records an image by modulating a light beam according to an image signal, irradiating an information recording medium with the modulated light beam, and performing scanning exposure,
It is equipped with a photodetector that detects the position of the light beam, and a counter that starts counting clock signals based on the output of the photodetector, and when the count value of the counter reaches a first set value, image recording is performed. An image recording apparatus characterized in that the image recording apparatus is configured such that the first set value can be arbitrarily varied at the same time as the first set value is started. (2) Even if the counted value of the counter exceeds the first set value, the clock signal counting operation is continued, and when the counted value of the counter reaches the second set value, image recording is ended and the 2. The image recording apparatus according to claim 1, wherein the second set value can be arbitrarily varied independently of the first set value. (3) In an image recording device that records an image by modulating a light beam according to an image signal, irradiating an information recording medium with the modulated light beam, and performing scanning exposure,
A photodetector that detects an arbitrary position of a light beam, a counter that starts counting clock signals based on the output of the photodetector, and a detection mechanism that detects the position and size of an information recording medium. An image recording apparatus characterized in that a recording start position and a recording end position can be independently set based on the position of an information recording medium detected by a detection mechanism.