JPH0438424A - Disc for optical encoder - Google Patents

Abstract

PURPOSE:To simply form any complicated pattern in a short time by forming a disk pattern by means of printing. CONSTITUTION:A rotating shaft 3 is freely rotatably provided on a base 1 via a bearing 2, while a rotating circular plate 4 having a disk pattern 4a comprising numerous bars is integrally provided on an end of the rotating shaft 3. On a side of one of the faces of the rotating circular plate 4, a fixed slit plate 5 having a fixed slit (not shown) is placed oppositely, while a light receiving element 6 is provided below the fixed slit plate 5 oppositely to the plate 5. On a side of the other face of the rotating circular plate 4, a circuit board 8 having an electronic circuit part 7 is provided fixedly by a fixing means not shown opposite to said face, while a light emitting element 9 is provided on a lower face of the circuit board 8 at a position corresponding to the fixed slit plate 5 and the light receiving element 6.

Description

DETAILED DESCRIPTION OF THE INVENTION a. Field of Industrial Application The present invention relates to a disk for an optical encoder, in particular:
By forming the disc pattern by printing,
Concerning new improvements to improve accuracy and cost.

b. Prior Art There are various types of discs for optical encoders of this type that have been used in the past, but a representative one is, for example, the one disclosed in Japanese Patent Application Laid-Open No. 1-173625. The configuration can be mentioned.

That is, although this configuration is not shown here, the disk pattern formed on the rotating disk was formed by etching.

C1 Problems to be Solved by the Invention Since the conventional optical encoder disk was configured as described above, the following problems existed.

In other words, as rotation control patterns have become more complex and sophisticated in recent years, the number of types of disk patterns has increased significantly, and the conventional etching method requires a complicated and labor-intensive formation process. However, forming many types of disk patterns requires a great deal of effort and time, and it has been extremely difficult to adequately meet the demand for multiple patterns at low cost.

Furthermore, since the etching process is complicated, the yield is low and it is not suitable for mass production.

The present invention has been made to solve the above-mentioned problems, and in particular, it is an object of the present invention to provide a disk for an optical encoder that improves accuracy and cost by forming a disk pattern by printing. purpose.

d. Means for Solving the Problems The optical encoder disk according to the present invention irradiates light from a light emitter onto a disk pattern formed on the disk surface, and receives transmitted light or reflected light on a light receiver. In the disc for an optical encoder, the disc pattern is formed by printing.

09 Effects In the optical encoder disk according to the present invention,
Since the disk pattern is printed using a printing means, the pattern can be formed extremely easily, and no matter how complex the pattern, the pattern can be formed simply and in a short time.

f. Embodiments Hereinafter, preferred embodiments of the optical encoder disk according to the present invention will be described with reference to the drawings.

FIG. 1 to FIG. 3 are for showing a disk for an optical encoder according to the present invention. FIG. 1 is a plan view showing the disk before printing, and FIG. 2 is a plan view showing the disk after printing. , FIG. 3 is a sectional view showing an optical encoder.

What is indicated by the reference numeral 1 in the figure is a base, and a rotary shaft 3 is rotatably provided on this base 1 via a bearing 2. At the end of this rotary shaft 3, a number of bars are attached. A rotating disk 4 having a disk pattern 4a is integrally attached.

A fixed slit plate 5 having a fixed slit (not shown) is disposed on one side of the rotating disk 4, and a fixed slit plate 5 having a fixed slit (not shown) is provided below the rotating disk 4. An element 6 is provided.

On the other side of the rotary disk 4, a circuit board 8 having an electronic circuit section 7 opposite thereto is fixedly disposed by a fixing means (not shown), and on the lower surface of the circuit board 8, A light emitting element 9 is provided at a position corresponding to the slit plate 5 and the light receiving element 6.

The base 1 is fitted with a case body 12 in which a connection line 10 is attached via a bush 11, and the connection line 10 has a built-in power supply line 13 and a signal output line 14. ing.

The disk 4 is shown in FIGS. 1 and 2 and has a cross pattern 4a printed thereon.

Since the disk 4 is transparent, this disk pattern 4a is formed by a printing pattern in which each slit 4aA portion is transparent.

Furthermore, when the disk pattern 4a is of a reflective type,
By configuring the disk 4 in a non-transparent, relatively bright color and printing a black thread disk pattern 4a on the disk surface 4b, a reflectively readable disk pattern 4a can be obtained.

It should be noted that if a multifunctional printing machine having a built-in memory for various patterns is used as the printing means, various disk patterns can be arbitrarily and quickly formed.

g Effects of the Invention Since the optical encoder disk according to the present invention is configured as described above, the following effects can be obtained.

That is, since the disk pattern is printed via the printing means, pattern formation can be performed extremely easily, and no matter how complex the pattern is, the pattern can be formed simply and in a short time.

[Brief explanation of drawings]

FIG. 1 to FIG. 3 are for showing a disk for an optical encoder according to the present invention. FIG. 1 is a plan view showing the disk before printing, and FIG. 2 is a plan view showing the disk after printing. , FIG. 3 is a sectional view showing an optical encoder. 4a is a disk pattern, 4b is a disk surface, 6 is a photoreceptor, and 9 is a light emitter.

Claims (1)

[Claims] Light from a light emitter (9) is irradiated onto a disk pattern (4a) formed on a disk surface (4b), and transmitted or reflected light is received by a light receiver (6). A disc for an optical encoder, wherein the disc pattern (4a) is formed by printing.