JPH0337637A - Optical system controller - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to an optical system control device that controls an optical system, and more specifically, to an optical system control device that accurately controls the stop position of an optical system used in a copying machine or the like. The present invention relates to an optical system control device for execution.

[Conventional technology]

FIG. 10 shows the optical system configuration of a copying machine that employs the document table fixing method. In this system, there is a contact glass 1001 on which an original 1000 is placed, and a scanner optical system 1002 under the contact glass 1001 that optically scans the contents of the original 1000 placed on the contact glass 1001. an imaging lens 1003 that forms an image of information light generated when the scanner optical system 1002 optically scans the original 1000; and a mirror 1004 that guides the light from the imaging lens 1003 in a predetermined direction.
It has a dust-proof glass 1005 and a photoreceptor drum 1006 that passes through the dust-proof glass 1005 and undergoes exposure processing with information light according to the content of the document.

The scanner optical system 1002 also includes an illumination light source 1007 that irradiates light onto the original, a reflector 1008 that reflects the light from the illumination light source 1007 and focuses the light only in the direction of the original 1000, and the illumination Light from a light source 1007 illuminates the source [1000] on the contact glass 1001.

a first scanner 1010 having a mirror 1009 that guides the reflected light in a predetermined direction; and a mirror l011 that guides the reflected light from the mirror 1009 in the direction of the imaging lens 1003;
and.

and a second scanner 1013 having a mirror 1012.

FIG. 11 shows a drive system configuration for driving the scanner optical system 1002.

A servo motor (DC motor) 1100 that causes the first scanner 1010 and the second scanner 013 to move back at a speed ratio of 72=1 so that the length of the optical path reflected from the original 1000 does not change during optical scanning; 1100 and a scanner wire 1101 stretched over the scanner wire 1100.

Further, at a predetermined position of the main body of the apparatus, there is provided a scanner constituted by a reflective photointerturbator for detecting the position of the scanner optical system 1002 at a first reference position (first home position) of the scanner optical system 1002. Home position sensor (hereinafter referred to as 1st HP sensor)
1102, a scanner home position sensor (hereinafter referred to as a second HP sensor) 1130 for detecting the position of the scanner optical system 1002 at a second reference position (second home position) of the scanner optical system 1002; The scanner 1010 is installed in the scanner 1010, and the first scanner 1010 is connected to the first HP sensor 1102 or the second HP sensor 1102.
When reaching the sensor 1130, the first HP sensor 11
02 or an HP all-sensor shielding plate 1103 for turning on the sensors 1102 and 1130 by blocking light from the second HP sensor 1130 and detecting that the first scanner 1010 has reached a predetermined home position.
and an encoder 1104 that generates a pulse signal in synchronization with the rotation of the servo motor 1100, and the pulse signal from the encoder 1104 is used as an interrupt signal to manually calculate the rotation speed of the servo motor 1100 from the time interval of one interrupt signal. Measure.

Executes proportional-integral control based on the difference from the target speed.

The control unit 1105 outputs an operation amount according to this result to the servo motor 1100 to control the rotational speed of the servo motor 1100.

In the above configuration, the scanner optical system 1002 moves from the first home position indicated by the solid line in FIG. 10 to the scanner wire 1 by driving the servo motor 1100.
A scanner optical system 1002 is driven to scan in the right direction via a contact glass 1001 to scan an original 1000 on a contact glass 1001.
Exposure and scan the surface. Further, the positions of the first scanner 1010 and the second scanner 1013 indicated by the two-dot chain lines in FIG. A backward motion will be performed toward the position.

That is, when the HP all-sensor shielding plate 1103 installed in the first scanner 1010 crosses the eleventh (P sensor 1102), the HP all-sensor shielding plate 1103 crosses the first HP sensor 11
2 control unit 1105 blocks the light from 02, and the 2 control unit 1105
The detection signal from the sensor 1102 is input and processed internally, and then a control signal is output to the servo motor 1100 to change the rotation direction of the servo motor 1100 from reverse (scanner forward direction) to forward rotation (scanner backward direction). The switching returns the scanner optical system 1020 from the overrun position to the home position.

Next, the copying process from the first and second home positions will be explained.

Here, the second home position is located at an intermediate point between the first home position and the maximum exposure position.

It is set at a distance of 216 meters from both.

For example, in a continuous copy mode using an ADF (automatic document feeder) (not shown), if the size of the original is 216 or less in the scanning direction of the scanner optical system 1020,
The speed-up mode of the ADF is set.

In this speed-up mode, the first document is transported by the ADF to a position corresponding to the first home position, and the scanner optical system 1020 executes exposure scanning from the first home position.

Thereafter, it moves to the second home position.

In such a case, if the end position of the exposure scan by the scanner optical system is on the first home position side with respect to the second home position, the scanner optical system 1020 returns to the forward movement side and returns to the second home position. It stops a few centimeters after passing the station, and then returns to its second home position.

Further, when the exposure scan end position of the scanner optical system 1020 is closer to the maximum exposure position than the second home position, a return operation similar to the return operation to the first home position is executed.

Since the second and subsequent documents are transported by the ADF to a position corresponding to the second home position, the scanner optical system 10
20 is scan-driven from the second home position in accordance with an exposure scan start command from the outside to expose and scan the document surface, and performs a return operation toward the second home position from the outside. The scanner speed, deceleration control, and stop control during this sorting operation are the same as those for the return operation to the first home position described above.

When the exposure scan of the final document is completed by repeating the copying operation in this way, a command to move to the first home position is output to the scanner optical system 1020 from the outside, and the scanner optical system 1020 returns to the first home position. Move to
The ADF speed-up mode ends.

[Problem to be solved by the invention]

However, with conventional scanner optical system control.

In the speed-up mode, during the return operation to the second home position, even if a new movement instruction to the first home position is output, it cannot be accepted.

For example, if it becomes necessary to exit the speed-up mode and return the scanner optical system to the first home position while the scanner optical system is returning to the second home position, After moving to the second home position and stopping, it was necessary to output a movement instruction to the first home position again to move the scanner optical system to the first home position.

As a result, in conventional scanner optics.

There is a problem that it takes a long time for the scanner optical system to reach the first home position, and it takes time before the first exposure scan is possible. Since there are cases where an instruction to move to the home position is accepted and cases where it is not accepted, there is a problem that control of the external device becomes complicated.

The present invention has been made in view of the above, and improves the response performance of a scanner optical system to a movement instruction, thereby shortening the time until copying operation becomes possible.

To simplify control on an external device side by accepting a movement instruction to a home position regardless of the operation mode of an optical scanner.

[Means to solve the problem]

In order to achieve the above object, the present invention includes an optical system for optically scanning a document, a servo motor for conveying the optical system, a control means for controlling the driving of the servo motor, and a plurality of optical systems for controlling the drive of the servo motor. an optical system control device that moves the optical system to a specified stop position based on an external instruction, and has a plurality of sensors arranged corresponding to a stop position of the optical system to detect the position of the optical system. , the control means is capable of accepting stop instructions for other stop positions during drive control for stopping the optical system at a specific stop position;
The present invention provides an optical system control device that executes control to stop the optical system at a finally designated stop position.

[Effect]

The optical system control device according to the present invention makes it possible to receive a stop instruction for the first home position during drive control to stop the scanner optical system at the second home position, for example, and to finally control the scanner optical system. to stop at the specified stop position.

〔Example〕

Hereinafter, two embodiments of the present invention will be specifically described based on the drawings.

FIG. 1 is an explanatory diagram showing the configuration of a control circuit of a scanner optical system.

This scanner optical system control circuit includes a control unit 100 (for example, μPD7811G microcomputer) as a control means, and a programmable interval timer 101 (for example, μPO3253C) as a measurement means.
and the programmable interval timer 101
an oscillator 107 that outputs a clock signal to the servo motor 110; a servo motor 110 for conveying a scanner optical system (not shown); Transistor 112 and transistor 113 interposed between
．． Transistor 114. ) A pulse generator that outputs two pulse signals (A-phase encoder pulse ENCA and B-phase encoder pulse ENCB) that are connected to the transistor 115 and the servo motor 110 and have different phases depending on the rotation amount and rotation direction of the 5 servo motor 110. An encoder 111 as a means, and a first HP sensor 106 that detects whether the optical system is at a first home position and outputs the detection result to the control unit 100.

It has a second HP sensor 120 that detects whether the optical system is in a second home position and outputs the detection result to the control unit 100. Also.

102 and 103 are buffers, and 104 is a flip
105 is an oscillator for the control unit 100, and 108 and 109 are gate circuits that gate the output from the programmable interval timer 101 to the transistors 114 and 115.

Further, the serial-data input terminal R of the control section 100
The XD terminal and the serial data output terminal TXD are connected to the TXD terminal and the RXD terminal of the master computer 130, respectively, and transmit and receive data using a serial interface function. Therefore, since the control section 100 controls the scanner optical system according to instructions from the master computer 130, it functions as a slave computer with respect to the master computer 100.

In the above configuration, its operation and control system will be explained below.

The servo motor 110 that transports the scanner optical system is
Driving transistor 11 connected to control unit 100
2, 113, 114, and 115 drive and control the direction of rotation. Specifically, the transistors 112, 11
4 is in the ON state, and transistors 113 and 115 are in the O state.
When in the FF state, a current for clockwise (CW) rotation is supplied to the servo motor 110, and conversely, the transistors 112 and 114 are in the OFF state.

When transistors 113 and 115 are in the ON state, current is supplied to the servo motor 110 to rotate it counterclockwise (CCW). When the servo motor 110 rotates clockwise (CW) as described above, the scanner optical system moves forward, and conversely, when the servo motor 110 rotates counterclockwise (CW), the scanner optical system moves forward.
CCW), the scanner optical system will move backward.

That is, the output PF6 of the second control section 100 is at L level.

When PF7 is at H level, the servo motor 110 rotates clockwise (CW), and the output PF6 of the control unit 100 rotates in the opposite direction.
is at H level and PF7 is at L level, counterclockwise (
CCW).

On the other hand, programmable interval timer 101
The output of ○UTI is converted to 0U by the gate circuit 109.
Only while TI is at L level (t on), transistor 1
14, a current proportional to t, (ON time of PWM control) is supplied to the servo motor 110, and its rotational speed is controlled.

On the other hand, when PF7 is at the L level, the transistor 113 is set to the ON state, and the transistor 115 is similarly set to the ON state via the gate circuit 10, so the servo motor 110 rotates in the opposite direction, and its rotational speed decreases. is controlled.

Furthermore, as described above, the encoder 111 connected to the servo motor 110 receives two pulse signals having different phases depending on the amount and direction of rotation of the servo motor 110, namely, a single-phase encoder pulse ENCA and a B-phase encoder pulse. ENCB is generated.

The forward or reverse rotation of the servo motor 110 is determined by the A-phase encoder pulse ENCA and the B-phase encoder pulse ENC.
It is detected because the phase difference with B is different. The principle is shown in Figure 2. Normally, two-phase pulses are output with timing ≥ timing as shown in Figure 2, and the A-phase encoder pulse ENCA
Based on the reference, the B-phase encoder pulse EN during forward rotation
The phase difference with CB is 90''.On the other hand, when it is reversed, it is 2
70°, which makes it possible to distinguish between forward rotation and reverse rotation.

This operation will be explained based on FIG. 1. After passing through the buffers 102 and 103, the A-phase encoder pulse ENCA and the B-phase encoder pulse ENCB are input to the flip-flop 104.

Since this flip-flop 104 is a D (delay) flip-flop, if the A-phase encoder pulse ENCA and the B-phase encoder pulse ENCB are at the timing shown in FIG. The Q terminal becomes H level, and in the case of reverse rotation, the Q terminal becomes L level. This is PC7 of the control unit 100
The signal is input to the terminal, and a determination is made as to whether the servo motor 110 rotates forward or reverse. Here, the buffer gate 102
．． 103 has a waveform shaping function together with the R-C circuit of each input section.

The above A-phase encoder pulse ENCA is.

The signal is input to the counter input terminal CI of the control section 100 via the buffer 102. The control unit 100 uses the A-phase encoder pulse ENCA to measure the interval between pulses of the A-phase encoder pulse ENCA using a counter (not shown) built in the control unit 100.

At the same time, the A-phase encoder pulse ENCA input to the counter input terminal CI serves as an interrupt input to the control unit 100. During interrupt program processing, which will be described later, encoder interval measurement data (ECPT) is read and this data is Calculate the rotation speed (scanner speed) of the servo motor 110 using the reference, calculate the error from the target rotation speed (target speed), and calculate the motor control amount (ON time of pulse width modulation PWM control) by proportional-integral control calculation. Programmable interval timer 10
Output to 1.

Here, programmable interval timer 10
1 uses counter 1 and counter O of the three built-in counters, and counter 0 is mode 3 (square wave rate generator, that is, generates a pulse wave with a constant ratio of H level and L level). , counter 1 is in mode l
(Programmable one-shot, that is, a pulse wave of a constant width is generated by a start signal).

Based on the information output to the programmable interval timer 101. fi waiting time is set, 0UT
A servo motor 110 is controlled through I. Control of this servo motor 110 is performed by pulse width modulation control as described above.

That is, the programmable interval timer 101
Information on the PWM cycle is loaded into the counter O of counter 0, and a square wave of the PWM cycle is output from the output 0UTO of counter 0.5 This signal is input to the gate of counter 1.

This counter 1 is loaded with the ON time information of the PWM signal, and the one-shot output synchronized with the PWM cycle is 0UT.
It is output from I and connects transistor 114 or transistor 115 to 0N10 through gate circuits 108 and 109.
FF control.

Figure 3 shows programmable interval timer 1
01 mode 3 (square wave rate generator) timing chart is shown.

In this case, if the set value is n, it operates as an input clock frequency division counter that outputs a pulse obtained by dividing the clock frequency by n.

In mode 3, the duty ratio when the count number is even is 1/2, and the duty ratio when the count number is odd is (n-1)/2n.

For example, when the number of counters n=5, the duty ratio is 21
5 (active low).

As a result, when this mode 3 is selected by the control word, 0UTO=H, and the count number is loaded with 'GA=H'. This starts counting.

When the count number is even, the first half of the count is ○
UTO=H, ○UTO=L in the second half. When the count number is odd, the first half of the count (n+1)/2
is 0UTO=H, second half (n-1) /2 is 0UTO=L
becomes. When GATE 1 =L, the count becomes ◯UT-H in synchronization with the falling edge of the signal and the count stops. Thereafter, when GATE1=H, counting starts from the initial value. If a count number is loaded during counting, a new count starts from the second cycle. If the count is an even number, the counter is decremented by 2, and if it is odd, when 0UTO=H, the counter is decremented by 1 at the first clock, and from the second clock onwards, it is decremented by 2.

Figure 4 shows programmable interval timer 10.
1 shows a timing chart of mode 1 (programmable one-shot).

This outputs a one-shot pulse (active low) of a specified length.

If you select this mode 1 in the control word, ○
UTO=H and GATE after loading the count number
It is triggered by the rising edge of 1 and starts counting. During this counting, 0UTO=L, and when the count ends, 0UTO=H again. In other words, the output is an active low one-shot output whose pulse width corresponds to the count number.

If a trigger is applied during counting (GATEI changes from L to H)
), the count starts again from the initial value. That is, 1. For example, if the set value is n, the GATE terminal changes from L to H, and the output becomes L for an interval of n clocks from the 9th order clock.

Note that even if a count number is loaded during counting, it does not affect the counting in progress, but when a trigger is applied, counting starts with a new count number.

FIG. 5 shows an example of waveforms for PWM control.

In this Fig. 5, the ON time is 0. Even if N changes, P
This shows that the WM period t (=tos+topr) is constant.

Here counter 0 is set to mode 3 (square wave rate generator) and counter l is set to mode 1 (programmable one shot). The output ○UTO of the counter O (mode 3) repeats HlL at a constant cycle according to the set value (no). - The period length t corresponds to the time of n0 clocks. This output is the counter l (
Mode l) GATE becomes human power. Therefore, its output ○
UT1 is set from the next clock with a delay of one clock (ii(n+), that is, the output becomes L by +LON).

PWMr? Since the i1 period is constant, it is only necessary to load the count number of counter 0 once. Also PWM#
11th T. Every time N time is changed, the count number of counter O is loaded.

FIG. 6 shows a flowchart of a serial reception interrupt performed when instruction data is received from the master computer 130 via the serial interface. Two parts of this serial reception interrupt process that are unrelated to the present invention will be omitted.

In serial reception interrupt processing, first, reception is received from the master computer 130 and the reception buffer register (R
600 to compare whether the instruction data being transferred to XB) (not shown) is the same as the instruction data received last time.
), If the instruction data being transferred is not the same as the instruction data received last time, a buffer (hereinafter referred to as "RAM") on a random access memory (hereinafter referred to as RAM) (not shown) built in the control unit 100 is , 5RBUFF) (601), and determines whether this instruction is an instruction to move to the home position (602).
. As a result, if the instruction is to move to the home position, a subroutine (SINTSUB) to be described later is executed (603), and the operation mode of the scanner is determined. On the other hand, if the instruction is other than an instruction to move to the home position, processing according to the instruction is executed (604). After that, cancel the prohibition of 1 interrupt processing (605
), the program returns.

7A and 7B are the subroutines (SIN
TSUB) is a flowchart showing the contents of TSUB.

In this subroutine, first the master computer 1
It is determined whether the movement instruction from 30 is an instruction to move to the first home position or to the second home position (701). If it is determined that this judgment result is an instruction to move to the second home position, the controls from 702 to 712 described below are executed. 713 to 720, which will be explained later.
Execute control up to.

First, when the control unit 100 determines that the movement instruction input by nine persons is an instruction to move to the second home position, it judges whether the second home position movement hold flag of the scanner is ON (702); If the second home position movement pending flag is ON, the program returns without executing the following control. On the other hand, if the second home position movement hold flag is OFF, the current scanner operation mode is determined from the scanner operation mode flag (SCTST), and the process is branched accordingly (7
03).

When performing return control to the first home position, the current position of the scanner is determined from the counter (SCADD) indicating the scanner position (704), that is, the scanner decelerates and returns to the second home position. If it is located before the position where stop control is started (on the maximum exposure position side), the scanner operation mode is switched to return control to the second home position by changing the value of the flag (SCTST) (705). In addition, if the scanner is located at the first home position and is not in the deceleration/stop control state toward the first home position, the scanner can be moved to a position other than the home position by changing the scanner's operation mode flag (SCTST). To change to deceleration/stop control (706), the scanner second home position movement hold plug is set to ON (707).

Note that the scanner first (second) home position movement pending flag is determined in the main routine described later.
If this flag is ON, after the scanner is stopped by deceleration/stop control, return control to the first (second) home position is executed.

When performing deceleration control to the first home position, a flag for suspending movement to the second home position is set to ON (708).

When the scanner is stopped at the first home position or when the document is being exposed and scanned, a flag for suspending movement to the second home position is set to ON (709).

2 For example, if the instruction to move to the second home position is changed to the instruction to move to the first home position and deceleration/stop control is being executed to a position other than the home position, the first The home position movement hold flag is turned OFF (710), and the scanner operation mode is changed to deceleration/stop control to the second home position by changing the flag (SCTST) (711).

Furthermore, if the scanner operation mode is not one of the above, the process returns without executing any processing. (712).

Next, in 701 of FIG. 7A, if the instruction from the master computer 130 is an instruction to move to the first home position, control shifts to FIG. 7B.

Here, first, it is determined whether the scanner first home position movement pending flag is ON or not. 713) If it is ON, the program returns; 2) Conversely, if it is OFF, the flag (SCTST) is Determine the current scanner operation mode (714) and branch the process accordingly.

If the scanner operation mode is return control by returning to the second home position or deceleration/stop control, change the scanner operation mode to the first home position by changing the flag (SCTST). (715) If the operation mode of the scanner is to execute return control by forward movement to the second home position.

Change the flag (SCTST) to change the scanner operation mode to deceleration/stop control to a position other than the home position (716), and set the scanner movement hold flag to the first home position to ON (717). .

In addition, when the scanner operation mode executes deceleration/stop control by forward movement to the second home position, the first
The movement pending flag to the home position is set to ON (71B).

Furthermore, when the scanner operation mode executes deceleration/stop control to a position other than the home position, the second home position movement hold flag is set to OFF (71).
9), by changing the scanner operating mode flag (SCTST).

Change to deceleration/stop control to the second home position (
720).

Further, if the scanner operation mode is not one of the above, no processing is executed and the program returns (721).

FIG. 8 is a flowchart of CI interrupt processing executed every time the A-phase encoder pulse ENCA falls.

First, it is necessary to determine whether the current state of the scanner optical system is forward movement or backward movement (801).
), if it is determined that it is forward movement, the counter (SCADD) indicating the current position of the scanner optical system is set to 1.
(802) If it is determined that the reverse movement is the opposite, the counter (SCADD) is decremented by 1 (803). As a result, the position of the scanner can always be known as the number of encoder pulses from the home position. Second, the rotation speed control of the servo motor is executed so that the scanner optical system moves based on the target movement speed of the scanner (+1 (TARC; ET)) (804).

Furthermore, the target value (TARGET) of the scanner movement speed is changed in order to move or stop the optical scanner in the scanner operation mode according to the flag (SCTST), and the flag (SCTST) is changed in order to shift to another mode. (805). Thereafter, the 1-interrupt prohibition process is canceled (806), and the program returns.

9A and 9B show part of the main routine of the scanner optical system control program.

That is, first, it is determined whether or not the first home position movement flag is ON (901).

If the first home position movement flag is ON, it is determined from the flag (SCTST) whether or not the scanner operation mode, that is, exposure scanning control is in progress (902);
If it is determined that exposure scanning control is in progress, a scanner stop process is executed (903). After that, the flag (SCTST) is switched to return control to the first home position (904). This operation also jumps to the scanner stop processing in 903 even if it is determined that exposure scanning control is not in progress in 902 above. executed. After the return control to the first home position is completed.

The movement flag to the first home position is set to OFF (905).

After that, whether the first home position movement flag is OFF in 901 or after going through a series of flows from 902 to 905 when it is ON, it is determined whether the second home position movement flag is ON (906). In this case, if it is determined that it is ON, it is determined from the flag (SCTST) whether or not the scanner operation mode, that is, exposure scanning control is in progress (90?). ), if it is determined that exposure scanning control is in progress, a scanner stop process is executed (908). After that, set the flag (SCTST) to the second
Switch to return control to home position (90
9). This operation is executed by jumping to the scanner stop processing at 908 even if it is determined at 907 that the exposure scanning control is not in progress. At this time, the movement flag to the first home position is set to OFF (910).

After that, in 906, if the first home position movement flag is OFF or ON, the flag (SCTST
) to determine whether the scanner operation mode is in the scanner stop state (911), and if the scanner is in the scanner stop state, the first home position movement pending flag is set to O.
It is determined whether it is N or not (912), and if it is determined that it is OFF, it is determined whether the first home position movement suspension flag is ON or not (913). In this case O
When it is determined that it is an FF, the flow goes through other processing to 901 in FIG. 9A. On the other hand, when it is determined that it is ON, the second home position movement flag is set to ON (914), and the second home position movement suspension flag is set to OFF (916).

If it is determined in 912 that the first home position movement hold flag is ON, the first home position movement flag is turned ON (915), and the first home position movement hold flag is turned OFF (917). ).

After that, after 916 and 917, the 9th
The flow advances to 901 in Figure A.

By executing control based on the above program, regardless of the operation mode of the scanner optical system.

It becomes possible to immediately respond to a movement instruction to the first or second home position.

Furthermore, although this embodiment has been described with respect to a device with two home positions, the above program can be used to process not only two home positions but also three or more home positions. becomes.

〔Effect of the invention〕

As explained above, according to the optical system control device according to the present invention, the control means for controlling the servo motor for conveying the optical system for optically scanning a document is configured to control the control means for controlling the servo motor for transporting the optical system for optically scanning a document to stop the optical system at a specific stop position. Accepts stop instructions for other stop positions during drive control.

In order to execute control to stop the optical system at the final designated stop position, the response performance to movement instructions of the scanner optical system is improved and the time required for two copy operations to become possible is shortened, and the optical scanner operates. Regardless of the mode, control on the external device side can be simplified by accepting instructions to move to the home position.

[Brief explanation of drawings]

FIG. 1 is an explanatory diagram showing the configuration of a control circuit for a scanner optical system according to the present invention, and FIG. 2 is an explanatory diagram showing the principle of a method for detecting forward or reverse rotation of a servo motor.
FIG. 3 is a timing chart of mode 3 (square wave rate generator) of the programmable interval timer. Figure 4 is a timing chart of mode 1 (programmable one-shot) of the programmable interval timer, Figure 5 is a timing chart showing an example of PWM control waveforms, and Figure 6 is a timing chart of the serial reception interrupt. FIG. 7A and FIG. 7B are flowcharts, and FIGS.
FIG. 8 is a flowchart showing the contents of the subroutine (SINTSUB) shown in FIG.
9A and 9B are flowcharts showing part of the main routine of the scanner optical system control program, and FIG. 10 is a flowchart showing a part of the main routine of the scanner optical system control program. FIG. 11 is an explanatory diagram showing the structure of a conventional optical drive system. Description of symbols 100--Control unit 101--Programmable interval timer 102.103--Buffer 104-m-Flip-flop 106.120--HP all sensors 08, 109--Gate circuit 110--Servo motor 111 ...-Encoder 112, 113, 114, 115- Transistor 13
0...-master computer

Claims (1)

[Claims] an optical system for optically scanning a document; a servo motor for transporting the optical system; a control means for controlling the drive of the servo motor; In an optical system control device that has a plurality of sensors that detect the position of the system and moves the optical system to the specified stop position based on an instruction from the outside, the control means specifies the optical system. The optical system is characterized in that during drive control to stop the optical system at the stop position, it is possible to receive stop instructions for other stop positions, and control is executed to finally stop the optical system at the designated stop position. Optical system control device.