JPS62254214A - Positioning device - Google Patents

Abstract

PURPOSE:To secure the precise positioning even at a point between positioning marks by using a timer means which delivers the time-up signals according to the time lapse corresponding to an indicated position between both marks. CONSTITUTION:A target point to be positioned is first set to switches 6 and 7 respectively according to the number of slits and a multiplier set to 1/N slit space. When a switch 8 is turned on, a motor 30 is driven forward and the coincidence signal is outputted from a comparator 9 when the coincidence is obtained between the slit detecting signal received from a sensor 2 and the number of slits supplied from the switch 6. Thus a computing element 11 sets the value obtained by multiplying the unit time delivered from a data selector 12 by the multiplier supplied by the switch 7 to a timer 10. The timer 10 delivers the time-up signal to stop the drive of the motor 30 when the number of clocks of a clock generator 18 reaches the set value. Thus the shift of the motor 30 is stopped.

Description

[Detailed description of the invention] (Industrial application field) The present invention relates to a positioning device.

(Prior art) Conventionally, in this type of positioning device, slits were arranged at regular intervals in the direction of movement of a moving member, and positioning was performed by photoelectrically counting the number of slits from a reference position. Positioning was performed only at positions where . That is, since the configuration detects and positions the slits themselves, positioning cannot be performed between the slits.

Therefore, by increasing the number of slits, the number of positioning positions was increased.

(Problem to be solved by the invention) Therefore, the conventional device had the following drawbacks.

For example, in a predetermined section, the number of positioning positions can be increased (
As a result, the distance between the individual slits is inevitably narrow, making it difficult to process the slits and difficult to detect them with a sensor.

Therefore, the object of the present invention is to solve the above-mentioned conventional drawbacks and
It is an object of the present invention to provide a positioning device that is easy to manufacture and has high reliability in position detection.

(Means for Solving the Problems) In order to achieve the above object, the device of the present invention provides a first member (three and detection sensor means (2, 25, 26, 27) for converting the output mark into an absolute value and detecting it; and one of the first member and the detection sensor means relative to the other in the direction in which the marks are arranged. a moving device (3, 30) for moving from a predetermined direction at a predetermined speed; an instruction means (6) for instructing a stop position; A control device (5, 8, 9, 10, 11, 12, 13,
14, 15, 16, 17, 18, 19, 20, 21, 2
2, 23, and 2, wherein the positioning device is configured to be capable of instructing the position between marks to the indicating means (T), and the control means is configured to be able to instruct the position between marks by the indicating means. a matching means (9) that outputs a matching signal when the mark closest to the mark is detected by the sensor means; Timer means (10, 11, 12, 13, 14, 15, 16) that outputs a time-up signal according to the elapse of time corresponding to
, 17, 18, 19, 20, 21, 22, 23, and 2, and the movement by the moving device is stopped by the time-up signal.

(Example) Hereinafter, the present invention will be described in detail with reference to Figure 1 and Figure 2.

FIG. 1 is an electrical block diagram showing one embodiment of the present invention.

A reflection plate 31 fixed to a first member (not shown) is provided with a plurality of long notches, ie, slits 1a to 1d, at predetermined intervals. In order to set the light transmitting portion, that is, the slit 1a, at the reference position, the flip-flop 26 is set when the switch 2T is turned on. flip flop 2
The 60 set signal is sent to the motor driver 3 as a signal for reversing the motor 30, and as a result, the motor 30 is reversed via the motor driver 3. The motor 30 is coupled to the first member by a rack-pinion mechanism (circuit) or the like, and as a result, the reflector 31 moves in the direction of arrow A. The slit detection sensor 25, such as a photoelectric element fixed to a fixing member (not shown), is a reflective sensor having a light emitting part and a light receiving part, and its output is normally at a high level, but when a slit is detected, the output is reduced to a low level. Become. The flip-flop 26 is reset at the rising edge of the detection signal obtained by the sensor 25 detecting the reference slit 1a provided at the reference position. As a result, the motor 30 is stopped by the motor driver 3.

Next, when the switch 5 is turned on, the NOT circuit 24 is activated and the flip-flop 15 is enabled (active). Then, when the switch 8 is turned on, the flip-flop 4 is set, and the set signal is sent to the motor driver 3.
is sent as a normal rotation signal for the motor 30, and the motor 30 is rotated in the normal direction by the motor driver 3. The reflecting plate 31 moves as the motor 30 rotates in the normal direction, and the sensor 25 has the same structure as the sensor 25, which is fixed to a fixed member (not shown) in the same way as the sensor 25.
detects the positions of n slits 1b, 1c, 1d, . . . 1a in total.

When the sensor 2 detects the slit 1b, the monostable multivibrator 13 outputs a pulse at the rising edge of the detection signal output by the sensor 2, and sets the flip-flop 15.

Similarly, at the falling edge of the detection signal output by the sensor 2, the monostable multivibrator 14 outputs a pulse and resets the flip-flop 15. By resetting the flip-flop 15, the flip-flop 4 is also reset, and the motor 30 is stopped by the motor driver 3.

By the way, when the flip-flop 15 is set, the counter 16 is reset and counts the clock of the clock generator 18 while the flip-flop 15 is set. The count value of the counter 16 is divided into 1/'N by a 1/N frequency divider 17 (N is preset, for example, 10).

On the other hand, when the monostable multivibrator 13 outputs a pulse due to the sensor 2 detecting the first slit 1a, the address counter 19 enables the memory 20 (activating state). When the sensor 2 detects the second slit 1b and the monostable multivibrator 14 outputs a pulse, the memory 20 stores the output signal of the 1/'N frequency divider 17. Therefore, the memory 20 stores the number of pulses corresponding to the time required to move 1/N of the distance t1 between the slit 1b and the slit 1C.

When the switch 8 is turned on again, the sensor 2 detects the second slit 1C and the monostable multivibrator 130 input signal rises, and the monostable multivibrator 13 outputs a pulse, and the flip-flop 15 is set. As a result, the counter 16 starts counting the clocks of the clock generator 18 and the address pointer 19 enables the memory 21. When the sensor 2 detects the third slit 1d and the input signal of the monostable multivibrator 13 falls, the monostable multivibrator 14 outputs a pulse and the flip-flop 15 is reset. As a result, the flip-flop 4 is reset and the motor 30 is stopped by the motor driver 3.

-10,000, the memory 21 stores the output signal of the 1/'N frequency divider 17 by the pulse of the monostable multivibrator 14. Therefore, the number of pulses corresponding to the time required to move the distance t201/'N between the slit 1c and the slit 1d is stored in the memory 21.

Similarly, if the switch 8 is turned on n times, the memory 22 stores a pulse corresponding to the time required to move 17/N of the interval tn (preferably also used as the (n-1)th pickpocket). The number will be memorized.

In this way, preparations for positioning are completed.

Then, after preparation is complete, to position it in the desired position,
First, the switch 27 is turned on and the reference slit 1a is detected by the sensor 1a. Further, the switch 5 is turned off and the comparator 9 is kept in an enabled state. Here, the desired position is set in the switches 6 and 7 by a multiplier (1 to N) of the number of slits and the slit interval to IA.

Thereafter, when the switch 8 is turned on, the flip-flop 4 is set and the motor 30 rotates normally via the motor driver 3. When the slit detection signal from the sensor 2 matches the number of slits input by the switch 6, the comparator 9
outputs a match signal (high level). This coincidence signal is inputted to one input terminal of the AND circuit 23, the data read command terminal of the data selector 12, and each of the memories 20-22.

Address pointer 19 is monostable multivibrator 13
The memories 20 to 22 are sequentially enabled by the output pulse of the comparator 9, and when the match signal is output from the comparator 9, the contents of the enabled memory are transferred to the data selector 1.
Incorporated into 2.

Sensor 2 is connected to the other input terminal of AND circuit 23, and the output signal of sensor 2 is at a high level between the slits, so the number of slits equal to the number of slits set by switch 6 is Due to the high level of the output signal of sensor 2 after passing through sensor 2, both input terminals of AND circuit 23 become high level, and AND circuit 2
3 causes the timer 10 to start timing.

The timer 10 measures time by counting the clock of the clock generator 18. The arithmetic unit 11 receives a unit time output from the data selector 12 (as a signal, a clock generator 1 generated while moving between slits)
The timer 10 is set to a value obtained by multiplying the number of clocks (equivalent to the number of clocks of 8 times IA) by the multiplier input through the switch 7. The timer 10 outputs a time-up signal when the clock number of the clock generator 18 matches the value set by the arithmetic unit 11. As a result, the flip-flop 4 is reset and the motor 3 is
0 stops.

This stop position is the position designated by switch 6.7, and can be positioned at any desired position even between the slits.

Since the reflecting plate 31 is fixed to the first member which is the controlled member, for example, if the reflecting plate 31 is configured as a rotating body and the slits are formed by cutting in the radial direction from the outer circumference, It can be used to control rotational position. That is, if the above embodiment is applied to a diaphragm opening/closing device that opens and closes a diaphragm by the rotation of a motor, for example, the amount of opening and closing of the diaphragm with respect to the amount of rotation of the motor becomes non-linear, and therefore the slit intervals will not be equally spaced. However, where the slit interval is large, the change in the amount of light passing through the aperture diameter is not so large. Therefore, the frequency may be divided by the same value between all slits.

The reason why the memories 20 to 22 are used to perform the preparatory operation of storing the value obtained by dividing the number of pulses between the slits by 1 at the beginning of the measurement is to take into account changes in the moving speed of the reflector plate 31. It is. That is, if the moving speed of the reflecting plate 31 changes due to wear and tear on the drive system, the number of pulses between the slits will differ, so by performing the above-mentioned preparatory operations at the start of measurement, the above-mentioned Even if there are such speed changes, the slitting can always be stopped. Of course, assuming that there is no speed change, a value obtained by dividing the number of pulses corresponding to each slit (corresponding to the travel time between the slits) by 1/N may be stored in advance. In that case, monostable multivibrator 13, flip-flop 16.1/
``H frequency divider 17 becomes unnecessary.

Further, in the above embodiment, the stop position is instructed by the switch 6.
This was done with switch 8, but if we consider the case where it is used for aperture control, for example, we can provide a numeric keypad or the like to indicate the aperture diameter, and send the signal corresponding to the aperture diameter to the number of slits and constants corresponding to the indicated aperture diameter. It is also possible to use a conversion circuit to convert it into .

In addition, in the figure, the slit width is drawn larger than the slit interval tl, t2 (etc.), but in reality, the slit width is smaller than the width obtained by dividing the slit interval by 1/''H. If set to , there will be no accuracy problem.

-a J+ s c-2y h-1μ n
ψ-1m, m+ -41, + 7 1+ -'
Although the value obtained by dividing J k by 1/'N was memorized, it is also possible to memorize the number of pulses that occur between the slits. It is equivalent to being present.

Now, in the embodiment shown in FIG. 1, hardware processing is performed, but it goes without saying that software processing using a microcomputer or the like may also be performed.

Next, the flowchart shown in FIG. 2 will be explained.

First, in process S1, the motor 30 is reversed and the slit 1a is aligned with the reference position (according to the signal from the sensor 25).
In process S2, the motor 30 is rotated forward. In process S, a signal from sensor 2 is detected, and when the signal becomes high level (H), time measurement by a timer is started in process S4. Returning again to process S, time measurement is stopped in process S when the signal from sensor 2 becomes low level (L).

Next, the value of 1/'N of the time value measured in step S6 is set in the first memory. Thereafter, in process S, the memory address is counted up (that is, the second memory is selected).

Process S is a determination operation for repeating the above process according to the number of slits, and when process S is completed a predetermined number of times, the motor 30 is stopped in process S. Through the processing up to this point, the time between each slit is stored in the memory, and preparations for positioning are completed.

Next, when positioning at a desired position, input the number of slits in step S1°, and step S1. Input the multiplier for 1/'NK of the time between the slits and process Stt.
reads the time value between slits from the memory corresponding to the slit.

Furthermore, in process StS, process 3 is applied to the value read in process Stt.
The multiplier input in step S11 is multiplied by the multiplier, and the value is set in the timer in step S14. After that, processing S1. After reversing the motor from the VC and aligning the slit with the reference position, process ST
Rotate the motor 30 in the forward direction with e. Processing St? Now, process S
,. When the number of slits input in step S matches the signal from sensor 2, a timer is started in step S□. If they do not match, process 31 until they match. can continue. In step S1, the value set in the timer is decremented, and when the value reaches zero, the motor is stopped in step S2. Positioning is completed through the above series of processes.

Also, processing S. After processing S,. By returning to , you can reposition to another position.

As is clear from the above operation, the flip-flops 4, 15, 26 and comparator 9 in FIG.
, timer 10, arithmetic unit 11, data selector 12, monostable multivibrator 13.14, counter 16.1/
'N frequency divider 17, clock generator 1B, address pointer 19, memories 20 to 22, AND circuit 23, NOT circuit 24, etc. can be replaced with a microcomputer.

In the above embodiment, a slit formed on the reflector plate 31 was used as a mark for position detection, but a black line that absorbs (does not reflect) light may be used instead of the slit, or it may be used as a sensor. Although the high level and low level of the signal are reversed, it is also possible to use a so-called transmission type in which a light transmitting part and a light receiving part are arranged with a reflection plate 31 in between.Of course, the mark can be made photoelectrically. In addition to those that can be detected, a magnet that can be magnetically detected may be used.

(Effects of the Invention) As described above, according to the present invention, positioning can be performed even between positioning marks, so even if there is an obstacle to narrowing the interval between positioning marks, more detailed positioning is possible. There is an effect that it can be done. Furthermore, even if more precise positioning is required, there is no need to increase the number of marks accordingly (this is preferable in terms of manufacturing because it can be handled by electrical processing).

[Brief Description of the Drawings] Fig. 1 is an electrical block diagram showing an embodiment of the present invention.
FIG. F2 is a flowchart when a part of FIG. 1 is processed by software. (Explanation of symbols of main parts)

Claims (1)

[Scope of Claims] A first member having a plurality of positioning marks arranged in a certain direction, a detection sensor means for detecting the positioning marks by converting them into absolute values, and a combination of the first member and the detection sensor means. a moving device that moves one of the marks relative to the other from a predetermined direction at a predetermined speed in the direction in which the marks are lined up; an instruction means for instructing a stop position; and detection of the positioning mark obtained from the sensor means. a control device that controls the movement of the moving device based on a signal to a stop position by the indicating means, the positioning device being configured to be able to instruct the indicating means to a position between marks; The control means includes matching means for outputting a matching signal when the sensor means detects a mark closest to the position indicated by the indicating means, and a matching means for starting time measurement based on the matching signal from the matching means; A positioning device comprising: timer means for outputting a time-up signal according to the passage of time corresponding to a designated position between marks, and the movement by the moving device is stopped in response to the time-up signal.