JPS5954918A - Manufacture of code plate of shaft encoder - Google Patents

Abstract

PURPOSE:To avoid the error caused by the deviation of the center when a code plate is attached to a rotary shaft, by arranging the position of a slit on the radius separated from the center of the rotary shaft by a specified distance. CONSTITUTION:An annular light shielding film 4-2 having a certain width is attached to a disk 4-1 concentrically with a central hole 4-4 of the disk 4-1. The disk 4-1 is fixed to a rotary shaft 2. Then the rotary shaft 2 is mounted to a chuck 12 of a slit machining apparatus. Under this state, a motor 10 is rotated, a pulse signal which is proportional to the motor speed, is generated by a pulse generator 11 and fed back to a control device 16, and the speed of the motor 10 is stabilized. The pulse signal is applied to a laser light emitting device 15 through a laser light emission control device 17, and the timing and output of the laser light emission are controlled. The laser light 15-1 is projected on the radius of the light shielding film 4-2 of the code plate 4. The position is separated from the center of the rotary shaft by a specified distance. At this time, intervals are provided in the pulse shaped laser light so as to have a specified relationship with the output pulses of the pulse generator. Then the light shielding film 4-2 is melted and a slit is formed.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides a shaft encoder, particularly a spindle shaft, with a do plate having slits at intervals of one inch near its outer periphery, and two 17 holes provided on the nido plate. and a gas generating device and a light conversion device arranged on both sides of the rotary shaft 9.
[! A slit provided in a disc fixed to a rotating shaft and a light shielding part without a slit intersect between the light emitting device and the Western electric converter 8.1. *Electrical rate, depending on the rotational axis of the incident light tmzc? The rotation axis is 0 rotations and 1 rotation.
Supports p'5, Ay, and X signals for 8"! The present invention relates to an improvement in a method 11 for manufacturing a code plate under a shaft encoder having a configuration.

Sea of the present invention? 7+-enco 1", - code, do board,
The manufacturing method includes at least fixing an opaque disk to a rotating shaft, and fixing the above-mentioned disk ';helmet;
A rotating shaft H is driven by a lily having a rotation speed i of a motive wheel and a movable motor; Intermittently irradiated with laser light. It is characterized in that it is controlled by the output of a bus, a pulse, or a generator provided in the drive device.

Embodiments of the conventional method and the method of the present invention will be described below with reference to the drawings. , :,,,,.

Fig. 1 (a) shows the conventionally practiced shirt tone -multi°- (hereinafter referred to as b-dar＼＼)"Q'"
``'''' is a sectional view showing an example of the configuration, 1 is the main body cushioning, 2 is the sectional view showing the configuration example.
3 is a rotating shaft, 3 is a bearing for supporting this force-2, and 4 is connected to the rotating shaft 2. Code board, 5 is this code board 4
6 is a light-emitting device placed on one side of the code plate 4, 7 is a fixed slit plate placed on the other side, and 18 is a conversion device. Is the device 9 installed by the electric conversion company? Change the output pulse waveform,
Electronics and equipment are now available.

Figure 1 (b)? (e) is a plan view showing details of the code plate 4 and a partial plan view. Figure 1(b), (
In e), 4-1 is a thin disk made of transparent glass or plastic, and near the outer periphery of the disk 4-1, an opaque light-shielding film 4-2 of a certain width is provided concentrically with the disk. The light shielding film 4-2 has slits 4 at a constant pitch.
-3 is provided, and the width B of the slit part and the width of the light shielding part are the same, 1.・,・M,・”−IL＞7 (c)
K y L, fi'','/'r7't-”7':j-f
-1 Used as a device to measure the rotational position of the bidirectional book shaft 2.
%sa,reru. For example, if the number of slits 4-3 provided in the cord plate 4 is determined, the rotating shaft ``2'' rotates once (36
0 degrees), the number of pulses emitted by the electronic device 9 is n, and the interval between one pulse and an adjacent pulse is equal to the rotation axis 2.
Shows the deafness of 1 rotation of 3 in, c W ] place! Detection is possible. Therefore, encoders are used in devices that control or measure extremely precise positions, such as devices that drive and axis the buttocks into small pieces and measure the position by 1 pltB.

The decomposition performance of an encoder is basically determined by the number of slits provided on the code plate, so an encoder with high decomposition performance has an extremely large number of slits. It is important to provide the same width of the light shielding part, and in order to manufacture a highly accurate encoder, the most important thing is to provide the slits on the code plate and the light part at the same pitch. . ``In the conventional method for manufacturing a code plate, as shown in FIG. 2(a), a metal plate such as nickel chrome is applied to a transparent disk 4-1 made of glass or silastics by sputtering or other means. A light-shielding film 4- formed by being attached circularly to the width.
After applying a dye-resistant photoresist on 2.
"!V"(b);'The light shielding film 4- shown in (c)
' The corresponding 6 sections and 8 intersections were arranged, the original map was projected onto a crystal photoresist, exposed, and then treated with acid. As a result, the light-shielding film at the slit 4-3 becomes transparent.
A slit 4-3 was provided for the completion of the 4 crabs.

In the above method while heating, a slit 4-3 is provided when applying a photoresist to the original pattern of the baton and projecting it onto the FC light-shielding film 4-2 (7). It is necessary to perform the work with great care so that the center knee of the hole 4-4 is aligned with the hole 4-4, but it is difficult to match this completely, and there will be some misalignment between the two. , of the generated pulse.

Time, I'm going to give you a false dick. Also, when attaching the cord plate 4 to the rotating shaft 2, there is no need to worry about corrosion.

As shown in Figure 2(b), a boss 5 is attached to one end of the rotating shaft 2.
-1 is fixed, and the code plate 4 with slits and grooves is fitted onto the rotating shaft, and the code plate 4 is fixed to the rotating shaft 2 with the boss 5-2 and rotates as one unit. Number 2 is 11.

When fixing the single rotation shaft i6-dore 4, the sled provided on the cord plate 7) 4-3 can be adjusted so that the center of the circle in which the rotary shaft is arranged coincides with the center of the rotary shaft. 0♀,
Please make sure that the inner diameter φ of the middle/9 hole 4-4 on the cord plate is slightly larger than the outer diameter φ-2' of the rotating shaft 2. ! A. It is possible to absorb and absorb the misalignment between the circle of 7 liters 4-3 and the center hole 4-4 as explained above, but the circle with the slits a, -a of this date plate, - Align the center with rotation axis 2,
.

Se6 work h n gate-s is, line 2 manual work under magnifying glass 0 7° 7 b,, many! This is one of the reasons why the time required for issuing notes and producing them is extremely high.

The following is an example of how the deviation between the center of the circle in which the slit 4-3 is arranged and the center of the rotating shaft 2 affects the output power. 2□Slit 4-3
If the diameter of the circle is 60φ and the number of slits is 50, then the width of the slit and the width of the light shielding film are 6.
0X3. i4X O,' 01 # '1.881m and '4h. The width of the slit with □ is the angle θ when looking at the center, and the angle θ is one slit and one slit apart. However, if the center of the rotation axis 2 and the center of the circle of the slit are shifted by 0.01 rnAn, the radius of the center of rotation between the inner periphery of the slit and the side of the capsule will be 30±0.01. From the name, when the slit width is 30±0.0i at its maximum, the angle θ' when looking at the center is 10'--# 0.0626457... Song (2) and Nashi (1 ) and (2) □0.0626
666-0.0626457 = 0.0000209
The ratio between and (1) is □ □0:o 'o 602 d 9÷0.0626□66
6 = 0.00033□35 □Even if the left name tnlJ- is shifted by 0.01% from the center position, the maximum value of the bit-of-light difference or 0.033- is shown. wood. □ Placing this slit so that it is aligned with the center of the circle and the center of the rotation axis so that it is about tt o, o・1rIVm can be considered to be the result of normal machining technology + the best storm, so even if it is a slit □
4" (2 liters when projecting onto No. 3 light-shielding film) 4"
- fl is provided: Even if the circle is a perfect circle and the bitches that can throw the ``Rainbow 1'' are perfectly even pitched,
Since the center of the rounding and the center of the rotation axis do not cross each other, the above-mentioned upward difference is added to the pitch of the output pulse. □ □ Fig. 3 shows a slitting device used to carry out the cord plate manufacturing method □ of the present invention, and 10 is an electric motor whose speed can be precisely controlled;
1 is a nine-pulse generator that is directly connected to the electric motor 1'0; 12 is a chuck that connects the rotating shaft of the electric motor io and the crystal shaft 40 rotating shaft 2; 15 is a laser emitter; and 16 is a speed control leg of the electric motor 10. A device 17 is a device for controlling laser emission from the laser emitter 15.

In the method of the present invention, the disk 4-
Attach an annular light-shielding film 4-2 with a width equal to 1 in the same manner as the center hole 4-4 of the circular plate 4-1, and attach this circular plate 4-1 to the rotation shaft 2 with the boss 5-1. 5-2, it is fixed integrally. At this time, there may be no problem even if there is a slight gap between the hole 4-4 in the disk and the rotating shaft 2.

Next, the rotating shaft 2 to which the disk 4-1 is fixed is mounted on the chuck 12 of the slitting device. In this state, the electric motor 10 is rotated at a certain speed via the speed control device 16, and a pulse signal proportional to the speed of the electric motor generated by the pulse generator 11 is returned to the control device 16 to speed up the electric motor 1o. constant.

At the same time, this pulse signal is used to control the laser beam.
In addition to the laser emitter 15, the output of the laser light is controlled through a device 17 that controls the timing and output of laser light emission, and the laser light 15-1 emitted by the laser emitter 15 is directed onto the light shielding film 4-2 of the code plate 4. The part of the light-shielding film where the Sony light falls is projected in a pulsed manner at intervals having a certain relationship with the output pulses of the pulse generator on a certain radius from the second center of the rotation axis. Melt the φ-beam light M4-2 to form a slit.

In addition, is there a 斡′ on the banknote of the present invention? Nakama - The strength and emission of Zah light
1. In order to adjust the light waveform and create a sharp and sharp slit, the intensity of the laser beam is increased as the speed of the electric motor is increased, and the duration is adjusted to be shorter.

As mentioned above, in the method of the present invention, the light shielding film 4 is applied to the code plate 4.
-2 is attached to the rotating shaft 2, the rotating shaft 2 is attached to the chuck 12 of the electric motor 10, and while rotating around the rotating shaft 2, the rotating shaft 2°, 7.715. -O. Ya deflection. Rank,. , Kayo. -2□ is a method of projecting a pulsed laser beam 15-1 at a pitch controlled by the pulse of the pulse generator 11, and creating a slit in the light-shielding film with the laser beam. , is located on the center diameter of 7 constants from the center of the rotating shaft, so the center notch q that occurs when attaching the code plate to the rotating shaft as in the prior art.
There is no room for errors due to misalignment.

Also, the pitch of the slits is directly connected to the electric car.

Since the timing of laser light generation is controlled by a pulse generator, it is independent of the rotational speed of the electric motor 10.
The pitch of the slits is not affected by speed fluctuations of the electric motor.

In addition, the number of slits can be easily changed by controlling the output pulse of the pulse generator using a device 17 for controlling laser emission, and unlike the prior art, an expensive original plate is manufactured every time the code plate is clicked. This has the advantage that high-precision code plates can be manufactured at low cost.

In the above embodiment, the code plate was explained as having a structure in which a light-shielding film is attached to a transparent thin plate such as glass or plastic, but other structures, such as an extremely thin metal plate without using a light-shielding film, may be used. Of course, I will try to do what I can.

[Brief explanation of drawings]

Figure 1 (&) is a cross-sectional view of the subsidiary shaft pre/corder,
Figure 1 (b,) 9. , (C) A plan view of the code board of Hasu and part of the Chixing map, Figure 2 (a) is an explanatory diagram of the code board, and No. 2 Figure (C) is =7
-)" An explanatory diagram of the center hole of the plate, FIG. 3, is a 21J cutting machine for carrying out the method of the present invention. 1...King 1.2...Rotating shaft 3... Bearing, 4... Code plate 1.4-1... Disc, 4-2.
... Light-shielding film, 4-3... Slit, 4-4.・
...Hole, 5...Knob 1, 5-1.5-2...Boss 1
．． 6... Light emitting device, 7... Fixed slit plate, 8...
- Photoelectric conversion device, 9... Electronic device, 10... Electric motor, 11... Pulse generation tp, 12... Chaik, 15
... Laser emitter, 15-1 ... Laser light, 1
6...Speed control device, agent: Patent attorney Makoto Sawaki
−

Claims (1)

[Scope of Claims] A disk having at least a desired radius of a circular ring is fixed to a rotating shaft, and the rotating shaft to which the circle i is fixed is used as a driving force, and the number of 6 times the driving force is detected. □ , □ 1111
111 Driven by a drive device having a pulse generator, the opaque portion of the disk is intermittently irradiated with a laser beam while rotating the disk to melt the irradiated opaque portion, and the opaque portion of the disk is rotated. A method for manufacturing a code plate for a shaft encoder, characterized in that the timing of light emission and its strong vibration are controlled by the output of a pulse generator provided in a drive device. ″ □