JPS63713A - Address type positioning device - Google Patents

Abstract

PURPOSE:To secure the accurate positioning to a command address by comparing an address detection signal with an address command signal and stopping a member to be driven after output of a coincidence signal. CONSTITUTION:The outputs of sensors 2 and 3 are supplied to a comparison means 5 as the address detection signals after undergoing the waveform shaping through a waveform shaping circuit 4. An address command signal is supplied to the means 5 by a command means 6 and the means 5 delivers a coincidence signal when the coincidence is obtained between the address command signal and the address detection signal. The means 6 contains dip switches 6a and 6b and a signal output means 6c which delivers the address command signals in response to the ON/OFF states of both switches 6a and 6b. A control means 7 supplies the address detection signal serving as the output of the circuit 4 and the coincidence signal serving as the output of the means 5. A motor driver 8 controls a motor 9 for rotary shaft 100 by the control signal given from the means 7.

Description

[Detailed description of the invention] (Technical field of invention) The present invention relates to a positioning device using an addressing method.

(Background of the Invention) A mark for an address signal is provided at each predetermined position of the driven member, and a detection means for reading the mark and outputting an address detection signal is provided in the vicinity of the driven member (e). There is known an addressing type positioning device which is fixed to a main body and controls the position of the driven member based on the address detection signal.

An example of this type of positioning device is a positioning device for an objective revolver of a microscope. That is, a mark for an address signal of several bits (for example, 2 bits) is formed on the outer surface of the objective revolver by embedding a magnet in correspondence with each objective lens mounting hole of the objective revolver.
A magnetic sensor (reed switch, etc.) with several bits (of course, the same number of bits as the mark) for detecting the magnet as the mark mentioned above can be installed on the mirror base facing the outer surface of the objective revolver as part of the detection means. be. The detection means waveform-shapes the signal from the magnetic sensor and outputs a rectangular waveform signal.

However, in such a structure, when the objective revolver rotates, the mark that crosses in front of the magnetic sensor moves continuously, so for example, if the signal (1, O) is used as an address command signal for positioning, ( Two parallel magnets for outputting the address signal (1, 1) move, and when the first magnet is detected by one of the magnetic sensors, the address signal (1,
Since an address detection signal of 0) is obtained, there is a drawback that positioning may occur at an incorrect address position.

Therefore, in the case of a microscope objective revolver, the torque of the objective revolver changes due to clicks when the objective lens enters the observation optical path.
The change in the drive current of the drive motor is detected, and this detection signal is used as the read command signal of the address detection signal.

However, since not all devices to which the addressing type positioning device is applied can conveniently obtain reading command signals, such as microscopes, it is difficult to provide a special reading command signal output device for such devices. The drawback was that it was complicated.

(Objective of the Invention) An object of the present invention is to provide an address-type positioning device that not only allows accurate positioning at a command address but also has a simple configuration and is versatile.

(Example) The present invention will be described below based on the example shown in the drawings.

FIG. 1 is a block diagram of one embodiment of the present invention, and FIG. 2 is a block diagram of an embodiment of the present invention.
Flowchart of the microcomputer shown in Figure 3 (
a) to (c) are diagrams showing the relationship between marks and sensors;
FIGS. 3A to 3C are diagrams showing address detection signals obtained corresponding to FIGS. 3A to 3C.

In FIG. 1, a disk 101 is fixed to a rotating shaft 100 as a driven member, and objective lenses 102, 103, and 104 having different magnifications are attached to the disk 101. Two light shielding plates 1a and 1b are provided on the outer circumference of the disc 101 to protrude. A sensor 2.3 for detecting the light shielding plates 1a and 1b is provided in the device main body (not shown). The distance between the sensors 2 and 3 is set to such a value that when the sensor 2 detects the light shield plate 1a, the sensor 3 detects the clockwise rotated light shield plate 1b. The sensor 3 has a light emitting part and a light receiving part, and passages of light shielding plates 1a and 1b are formed between the light emitting part and the light receiving part.

The output of the sensor 2.3 is waveform-shaped by a waveform shaping circuit 4 and then inputted to the comparison means 5 as an address detection signal. An address command signal is inputted to the comparison means 5 by the command means 6, and the comparison means 5 outputs a coincidence signal when the address command signal and the address detection signal match.

The command means 6 has dip switches a, 6b, and a signal output means 6C for outputting an address command signal according to the on/off state of the dip switches 6a, 6b.

The control means 7 manually inputs the address detection signal which is the output of the waveform shaping circuit 4 and the coincidence signal which is the output of the comparison means 5.

The motor driver 8 controls the motor 9 that rotationally drives the rotating shaft 100 based on the control signal from the control means 7 .

In this embodiment, the comparison means 5 and the control means 7 are constituted by a microcomputer M.

Next, the operation of FIG. 1 will be explained based on FIG. 2, which is a flowchart of the microcomputer M.

First, the address command signal is read (step 20), and it is determined whether the address command signal is (1, 1) (
Step 21). If the address command signal is (1, 1), the motor is rotated in the normal direction (step 22), the address detection signal is read (step 23), and when the address command signal and the address detection signal match (step 24), the motor is It is stopped (step 25).

On the other hand, when the address command signal is other than (1, 1), the motor is rotated forward (step 26), the address detection signal is read (step 27), and the address detection signal is (0, O).
(Step 28), compare the address command signal and the address detection signal (Step 29), and when they match, check whether the address detection signal becomes (1, 1) (Step 3).
0), (0,,0) (step 31). Next, when the address detection signal becomes (1, 1), wait until the address detection signal becomes (0, 0) (step 31). Step 32) Read the next address detection signal again (Step 27), and when the address detection signal becomes (0, O), reverse the motor and step 33), the address command signal and address detection signal match. (Step 3)
4) Stop the motor (step 25).

When the address command signal of (steer knob 29) and the address detection signal do not match, the detection signal becomes (0, O).
The next address detection signal is read again (step 27).

Because of this structure, when the light shielding plate 1a is at the position of the sensor 2 as shown in FIG. 3(a), the objective lens 102 is inserted into the optical path β in FIG. 1, and as shown in FIG. 4(a).
The address detection signal (52, S3) is (1,, O
), and when the light shielding plate 1b is at the position of the sensor 3 as shown in FIG. 3(b), the optical path in FIG. objective lens 1
04 is inserted, the address detection signal (SZ, S:+) is (0, l) as shown in FIG. 4(b), and the address detection signal (SZ, S:+) is (0, l) as shown in FIG. 3(c).
When the light shielding plate 1b is at the position of the sensor 2 and the light shielding plate 1a is at the position of the sensor 3 as shown in FIG. 1, the objective lens 103 is inserted into the optical path l in FIG. The detection signal (s2°S3) is (1,1). However, the address detection signal (Sz, 53)
Looking at the time change when (1, 1) occurs, as shown in FIG. t1
region, t2 representing (1,1) region, t representing <0.1)
(This is a case where the light-receiving areas of the sensors 2 and 3 and the light-shielding plates 1a and 1b are the same in size, but the intervals between them are slightly different.

Variations in the size of the light receiving areas of sensors 2 and 3, light shielding plate 1
Various relationships may occur due to manufacturing errors in a and lb).

Therefore, the (1.0), (0,1) state that occurs in the process of obtaining the address detection signal (1°1) and the (1°0), (0,1) state that is the original address detection signal. In both cases, a matching signal is obtained from the comparing means 5. However, according to the above embodiment, when the address detection signal is (1, 1), there is only the t2 region in FIG. When the address detection signal is (1, O), (0, 1), the motor 9 is stopped by the coincidence signal that is generated, but when the coincidence signal disappears after the coincidence signal is obtained from the comparing means 5, the address If the detection signal is <0. 0).

That is, in FIG. 4(a), the address detection signal is (1,
When the signal becomes O), a match signal is generated from the comparison means 5, and when the -defeat signal disappears, the address detection signal becomes (0, O). However, in FIG. 4(c), area 1. Even if the address detection signal becomes (1, O) and a match signal is generated from the comparison means 5, when the -defeat signal disappears (moves to area t2), the address detection signal becomes (1, 1). , which distinguishes between the true position (former) and the false position (latter). In the former case (as shown in Figure 4(a)), by the time the true position is determined, the stop position has already been passed.
Reverse motor 9. Then, the address detection signal (
1, 0), the comparison means 5 outputs a coincidence signal, and the motor 9 is thereby stopped. The same applies when the address command signal is (0°1).

In this way, accurate positioning can be performed without providing a device for commanding special reading timing.

In addition, in the above embodiment, an example was given in which two sensors are used to set two bits, that is, a maximum of four types of positions.
You can also set more positions by adding more sensors.

Also, as a mark, a reflective plate is used instead of a light shielding plate,
A reflective sensor may be used as the sensor, and instead of photoelectric detection, a magnetic detection method may be used.

That is, for example, a mark may be formed by embedding a magnet, and a magnetically sensitive element such as a reed switch may be used as a sensor.

(Effects of the Invention) As described above, according to the present invention, not only can positioning be performed accurately at a command address, but also a versatile addressing type positioning device can be obtained with a simple configuration. Particularly, according to the present invention, assembly and adjustment operations are simple because no precision is required in the positioning of the mark and the detection means.

[Brief explanation of drawings]

FIG. 1 is a block diagram of one embodiment of the present invention, and FIG. 2 is a block diagram of an embodiment of the present invention.
Flowchart of the microcomputer shown in Figure 3 (
a) to (C) are diagrams showing the relationship between marks and sensors;
FIGS. 3A to 3C are diagrams showing address detection signals obtained corresponding to FIGS. 3A to 3C. (Explanation of symbols of main parts) 1a, 1b... Light shielding plate (mark), 2.3... Sensor, 4... Waveform shaping means, 5... Comparing means, 6... Commanding means, 7... Control means.

Claims (1)

[Scope of Claims] A mark for an address signal is provided at each predetermined position of the driven member, and a detection means for reading the mark and outputting an address detection signal is fixedly installed in the main body of the apparatus, and a detection means for reading the mark and outputting an address detection signal is provided, In the addressing type positioning device that controls the position of the driven member by using a command means for outputting an address command signal corresponding to a desired position, the address detection signal and the address command signal are compared, and if the two match, a comparison means for outputting a coincidence signal; moving the driven member in one direction, and determining from an address detection signal that changes immediately after the coincidence signal is output, the address detection signal when the coincidence signal is output; It is determined whether the signal is a pseudo signal or not, and if the signal is not a pseudo signal, the driven member is moved in the opposite direction, and after the driven member is moved in the opposite direction, when the matching signal is output, the driven member is moved. An addressing method positioning device comprising: a control means for stopping the address system; and a control means for stopping the address system.