JPS6356641A - Information recording device - Google Patents

Abstract

PURPOSE:To accurately detect an image position even if the speed of a motor for moving an optical system which scans an image on an information recording medium varies by obtaining signal readout timing from a photodetecting element with synchronizing pulses from the motor. CONSTITUTION:A motor driver 23 is a driver for a main motor 31 and the scanner motor 30 which moves a scanning mirror and is controlled by receiving a signal from a CPU 20. Further, the motor 30 is provided with an encoder 32 and a signal from the encoder 32 is fed back to the driver 32 and also inputted to the interruption terminal of a CPU 20, which performs interruption processing. The output signal of the photodetecting element 12 is read by said interruption to detect an accurate image position on the element 12. Consequently, a measurement area does not change owing to variance in the startup speed of the motor 30, so density detection is performed in the invariably accurate measurement area and the image density is not different among prints.

Description

Detailed Description of the Invention (Industrial Application Field) The present invention detects the image density of an information recording medium such as a microfilm at multiple points in the image area using a plurality of light receiving elements, and then detects the image density based on the detected image density. The present invention relates to an information recording device that controls a recording area.

(Prior Art) Conventionally, in this type of information recording device, automatic density adjustment (
When the light receiving element scans the image area of the microfilm for AE), it is synchronized with the signal from the start position sensor and the CPU clock, or the signal from the start position sensor and the rotation of the photosensitive drum as an image recording medium. The photometric area was determined by reading the output signal from the light receiving element using a clock or the like.

(Problems to be Solved by the Invention) However, in such a conventional example, when the former CPU clock is used, the optical system position is detected based on the start position signal.

It does not take into account the startup speed of the clutch or the motor, and if the speed varies due to load fluctuations, AC motor voltage fluctuations, etc., the position of the optical system cannot be detected accurately.

In addition, in the case of the latter reading using a clock that is synchronized with the rotation of the photosensitive drum, it is synchronized with the rotation of the photosensitive drum, so if the rotation of the photosensitive drum and the movement of the optical system are performed by the same motor, it can be said that the position of the optical system is approximately equal to the position of the optical system. However, it is still impossible to detect the correct position due to variations in the startup speed of the clutch and inertia.

However, in both of the above cases, there is a problem in that it is difficult to perform accurate automatic density adjustment processing because the photometric area is different for each print. In addition, recently there are mechanisms that automatically erase the frame, but in this case, it is difficult to erase the frame accurately on microfilm, especially if the relationship between the optical system position and the reading position of the light receiving element is misaligned. There was a problem in that it was not possible to do so, and variations occurred.

Therefore, the present invention has been made to solve the above-mentioned problems of the conventional example.The purpose of the present invention is to maintain accurate control even when the start-up speed or steady state speed of the motor for moving the optical system changes. An object of the present invention is to provide an information recording device that can detect an image position and can prevent variations in frame displacement in a photometric area and recording area control (frame erasing) a mechanism in the case of automatic density adjustment.

(Means for Solving the Problems) In order to achieve the above object, the present invention detects the image density of the information recording medium at multiple points in the image area using multiple light receiving elements, and detects the image density of the information recording medium at multiple points in the image area. In an information recording apparatus that controls a recording area based on an image density, the signal degassing timing from the light receiving element is controlled by a synchronization pulse from a motor for moving an optical system that scans an image on the information recording medium. It is made up of.

(Function) In the present invention having the above configuration, the signal reading timing from the light-receiving element that detects the image density of the information recording medium is determined by a synchronous pulse from the moving motor of the optical system that scans the image of the information recording medium. By obtaining this information, the accurate image position on the light receiving element can be detected.

(Example) The final rJJ will be explained below based on the illustrated embodiment.

FIG. 2 is a diagram showing the basic configuration of a reader printer to which the present invention is applied. Illuminated by an illumination neck consisting of a lens 4, the image light of the microfilm l passes through a projection lens 5, is reflected by a scanning mirror 6.7, passes through a slit 9 of a slit plate 8, and is projected onto a photosensitive drum 10. . The mirrors 6.7 are fixedly supported on a support 11 in a relationship that intersects each other at right angles, and the support 11 is connected to the mirror 6.
．． 7 in the direction of arrow A. Mirrors 6 and 7 are normally in the home position and are moved forward when copying.
During this forward movement, the image on the microfilm 1 is transferred to the photosensitive drum l.
When the exposure of the image is completed, it moves backward and returns to the home position. The photosensitive drum 10 rotates at a constant speed in the direction of arrow B, and the mirror 6.7 moves at a speed equal to the circumferential speed of the photosensitive drum IO. In addition, photosensitive drum 1
A slit plate 8 having the above-mentioned slit 9 is arranged near the point 0.

In the above configuration, the image on the microfilm 1 is divided into slits and formed on the circumferential surface of the photosensitive drum 100 via the 3 and 9, and the mirror 6.7 is moved in the direction indicated by the arrow and the photosensitive tram 10 The images of the image frames of the microfilm 1 are sequentially transferred to the photosensitive drum 1 by scanning by rotation in the direction of arrow B.
The peripheral surface of 0 is exposed to light. At this time, the plurality of light receiving elements 12 arranged near the slit 9 of the slit plate 8
A part of the projected image reflected by the angle 7° is received. Further, the light receiving element 12 is connected to the microfilm 1
The image density of the microfilm 1 is detected by detecting the transmitted light, and the amount of exposure is detected prior to image exposure to the photosensitive drum 10. Further, the detection of the image density by the light receiving element 12 is performed by pre-scanning the mirror 6.7 (briscan) to scan the microfilm 1 before the regular exposure process, and during this preliminary scanning, the image density is detected by the photo-receiving element 7'12. The brightness of the lamp 2 is controlled based on the amount of light, whereby the amount of exposure to the photosensitive drum 10 is appropriately controlled, and good copies of microfilm originals can be obtained.

Figure 1 is a block diagram showing the control system of the L-printer, in which the print image density is automatically controlled and the automatic sake cooling mechanism is controlled by digital signal processing using a microcomputer. That is, the image density signal obtained by photoelectric conversion by the light receiving element 12 is sent to the A/D converter 2.
1 chip CP after being slightly converted into digital through 1
Input to U20. The CPU 20 converts the input data into a z-value using a predetermined threshold value (hereinafter referred to as slice level) and stores it in the RAM 29 . Also.

The CPU 20 performs arithmetic processing on the image signal from the light-receiving element 12, and controls the amount of lamp light and the developing bias based on the result of the calculation. Lamp 2 and developing bias 28 are CP
Noticing the signal from U20, lamp regulator 26
, controlled through the high pressure unit 27.

Furthermore, the motor driver 23 is a driver for a main motor (M, ) 31 that rotates the photosensitive drum 10 and a scanner motor (M2) 30 that moves the scanning mirror 6.7.
It is controlled by receiving a signal from U20. In addition, the main motor 31 and the scanner motor 30 each have an encoder (
FGI) 33 and an encoder (FG2) 32 are provided. The signals from these encoders 32 and 33 are fed back to the motor driver 23 and controlled to ensure constant speed rotation, and the encoder 32 is input to the interrupt terminal of the CPU 20, and interrupt processing is performed in accordance with the input signal of the encoder 32. . The cold sake unit 22 for controlling the recording area according to the image area also uses the CPU 2.
0. The cold sake unit 22 controls the shutter plate 41 and the shutter plate 4 so as not to project the frame of the microfilm l onto the photosensitive drum 10 based on the image area information read from the light receiving element 12 during pre-scanning.
2 are operated by a pulse motor 43 and a pulse motor 44, respectively.

On the other hand, the pulse from the encoder 32 of the scanner motor 30 is as shown in FIG. 3(a), and the data from the light receiving element 12 is read by the A/D converter 21 at the rising edge of the pulse. This reading timing Tl, T2,
T3, ・”Tn is l+, J12 on microfilm l, as shown in Figure 3(b).

! L3,...cross. These positions correspond to the positions of the microfilm 1, which are equally spaced on the microfilm 1, and accurately correspond to the positions of the microfilm 1 even when the scanner motor 30 starts up and falls down.

Next, the processing on the CPU 20 will be explained according to the flowchart in FIG. In FIG. 5A, the CPU 20 initially sets N=0 and waits until an interrupt signal is input (step 2).

When an interrupt signal is input, the interrupt routine shown in FIG. 4(b) is entered, and N is counted up in step
A signal from the light receiving element 12 is inputted from the A/D converter 21 (step 2).

The data read into the address corresponding to the value of N is
Write on AM29 (step ■), then repeat this process until the value of N reaches n (step ■),
Perform automatic density adjustment (AE) calculation processing (step ■)
As shown in FIG. 4(c), the AE calculation process takes the maximum value L@aX of the light-receiving element signal when it is positive, and takes the minimum value L@s in of the light-receiving element signal when it is negative (step ~■) 0 Then, the exposure value F is calculated based on the set (step σφ). In addition, in step ■, a cold calculation process is performed. If negative/positive reversal copying is performed in such a case, a solid dotted frame B will be printed around the image area G of the transfer paper P as shown in FIG.
This is to obtain a printed image without a solid dotted frame as shown in the figure.

The operation of the control system for obtaining a print image as shown in FIG. 9 will be explained based on the flowcharts shown in FIGS. 6(a) and 6(b). First, the light-receiving element output value Spk indicating the background peak value and the light-receiving element output maximum value s w
Calculate ax (step ■).

Furthermore, the slice level sh is Sh = K (Sway
-5pi+) (k: constant [0,3 to 0.5])
Calculate based on (step ■), and initial value i=
As 0 (step ■) data number nu■ (number
Add i until al) (step ■), and return steps ■ to ■ to green. In addition, in step (2), the output value of the first light receiving element is compared with the slice level sh, and if it is larger than the slice level sh, the Si
If it is small, set Si to 1 (Step 2), and if it is small, set Si to O (Step 2). As a result, the inside of the RAM 29 becomes as shown in FIG.

Next, the LF calculation routine of step (2) will be explained based on FIG. 6(b). The microcomputer 20 sequentially determines whether the first column of the image illuminance data in the RAM 29 contains all 0's or 1 (from cloudy to 0 in step 7), starting from the 1+ bit column of the image illuminance data. If so, this judgment is repeated sequentially as 21, 22, sentence 3, etc. (step 4). When Aln containing 1 is first discovered (in the illustrated example!;Lb), the microcomputer 20 sets the value LF of the 1 image recording area to n (step o
), and further, the above operation is performed in the same way at the left end and both upper and lower ends of the image area G to determine the image recording area.

Therefore, based on the data of the image recording area, the microcomputer 20 determines whether or not toner development is performed by setting the developing bias 28 to 0N10FF in the feeding direction of the microfilm, that is, the feeding direction of the photosensitive drum 10. controlled by. Further, the direction perpendicular to the feeding direction of the microfilm, that is, the axial direction of the photosensitive drum 10 is the first
The opening length of the slit 9 is controlled by driving the pulse motors 43 and 44 shown in the figure to wind or unwind the shutter plates 41 and 42. In this state, scan the scanning mirror 6.7 and turn on the developing bias 28 as appropriate.
, , an image is recorded on the transfer material P. As a result, as a result of printing out, an image as shown in FIG. 9 can be obtained.

In the illustrated embodiment, the image recording area in the circumferential direction of the photosensitive drum 10 is developed using a developing bias of 0N10FF, but the invention is not limited to this. 0N10FF, or when the developing device approaches and separates from the photosensitive drum.Also, the case where the image recording area in the axial direction of the photosensitive drum IO is recorded by moving the shutter plate has been described, but it is also possible to use a liquid crystal shutter, etc. Of course you can do it.

Further, in the illustrated embodiment, a case has been described in which an image is recorded by exposing a photosensitive drum to an image, but it can also be applied to a case where images on a microfilm etc. are read by COD etc. and an image is recorded on an optical disk etc. .

Therefore, in the above embodiment, by reading the output signal from the light receiving element 12 by interrupting the synchronization pulse from the scanner motor 30, it is possible to accurately detect the image position on the light receiving element.

As a result, the photometry area does not change due to variations in the motor startup speed, so density detection can always be performed in the accurate photometry area, and the print image density does not vary from print to print.In addition, the scanner motor 30 is synchronized Since the start timing can be synchronized by pulses, a start position signal is not required.

(Effects of the Invention) The information recording device according to the present invention has the configuration and operation described above, and there is no need to detect the start position, and even if the vertical speed of the motor or the speed in the steady state changes, it can be accurately recorded. The image position can be detected, and there is no variation in the photometry area or the cold drink position in the automatic cold drink mechanism in the case of automatic C degree adjustment, and accurate and precise control can be performed.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing a control system of a reader printer to which an embodiment of an information recording device according to the present invention is applied, and FIG. 2 is a schematic configuration diagram of the embodiment. FIGS. 3(a) and 3(b) are time charts and explanatory diagrams showing the scanning state in the same embodiment, and FIGS. 4(a) and 4(b).
), (C) are flowcharts showing the operation of the control system in the same embodiment, FIG. 5 is an explanatory diagram showing image illuminance data in the same embodiment, and FIGS. A flowchart showing other operations of the system, and FIG. 7 is an explanation showing an image on a microfilm] FIG. J1, FIG. 8, and FIG. 9 are explanatory diagrams showing printed images. Explanation of symbols l... Microfilm (information recording medium) 12...
Light receiving element 20...CPU23...Motor driver 30...Scanner mode 31...Main motor 32...Encoder 33...Encoder

Claims (1)

[Claims] In an information recording apparatus that detects the image density of an information recording medium at multiple points in an image area using a plurality of light receiving elements and controls a recording area based on the detected image density, the timing of reading signals from the light receiving elements is controlled. An information recording apparatus characterized in that an image of the information recording medium is obtained by synchronizing pulses from a moving motor of an optical system for scanning.