JPH0447221A - Disc for optical encoder - Google Patents

Abstract

PURPOSE:To enable formation of a complicated pattern simply by forming a disc pattern on a film provided on a disc surface to get the film integrated with a disc body comprising a resin by an insert molding. CONSTITUTION:A rotary disc 4 has a film 20 on which a disc pattern 4a is printed with a printing press on a disc surface 4b of a disc body 4A made up of a resin. The film 20 is integrated with the body 4A within a die 30 by an insert molding. As the body 4A is transparent, the pattern 4a is formed by a printing pattern with each slit 4aA made transparent. This enables a pattern formation simply even when a pattern is complicated.

Description

DETAILED DESCRIPTION OF THE INVENTION a. Field of Industrial Application The present invention relates to a disc for an optical encoder, in particular,
This invention relates to a novel improvement for improving accuracy and cost by forming the disc pattern into a film that is integrated into the disc body by insert molding.

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 multiple steps and a lot of manpower to form them. Therefore, it takes a great deal of effort and time to form many types of disk patterns, and it has been extremely difficult to adequately meet the demand for multiple patterns at low cost.

However, because 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, to improve accuracy and cost by forming a disc pattern on a film that is integrated into the disc body by insert molding. The purpose of the present invention is to provide a disk for an optical encoder that has the following characteristics.

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 optical encoder disk, the disk pattern is formed on a film provided on the disk surface, and the film is integrated into the disk body made of resin by insert molding.

09 Effects In the optical encoder disk according to the present invention,
The disk pattern is formed on a film provided on the disk surface, and the film is integrated into the disk body made of resin by insert molding, so pattern formation can be performed extremely easily, and any complicated pattern can be formed. Even if there is a pattern, the pattern can be formed easily 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.

Figures 1 to 41 are for showing a disk for an optical encoder according to the present invention. Figure 1 is a plan view showing the disk before insert molding, and Figure 2 is a plan view showing the film before molding. , Figure 3 is an enlarged sectional view of the disk, Figure 4 is an enlarged sectional view of the disk.
The figure 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 large number of bar patterns are formed. 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 rotating disk 4, a circuit board 8 having an electronic circuit section 7 facing the rotating disk 4 is fixedly disposed by a fixing means (not shown), and on the lower surface of the circuit board 8, the electronic circuit section 7 is fixedly disposed. A light emitting element 9 is provided at a position corresponding to the slit plate 5 and the light receiving element 6.

A case body 12 to which a connection line 10 is attached via a bush 11 is fitted onto the base 1, and a power supply line 13 and a signal output line 14 are built into the connection line 1o. ing.

The disk 4 is constructed as shown in FIGS. 1 and 2, and has a mark (not shown) on the disk surface 4b of the disk body 4A made of resin. M8! A film 20 is provided on which the disk pattern 4a is printed by a printing means consisting of.

The film 20 is placed in a mold 3 as shown in FIG.
It is integrated with the disk main body 4A inside the disk by insert molding.

Since the disk body 4 is transparent, the disk pattern 4a is formed by a printed pattern in which each slit 4aA is transparent. It should be noted that the film 20 can obtain the same effect not only when forming a pattern in printing but also when forming a pattern as a photographic negative.

Further, the disc pattern 4a is formed into an oval shape with a non-transparent relatively bright color, and the disc pattern 4a is made of a black disc pattern 4 on the disc surface 4b.
By printing a, a reflective readable disc 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.

g1 Effects of the Invention Since the optical encoder disk according to the invention is configured as described above, the following effects can be obtained.

In other words, since the disk is constructed by insert-molding a film on which a disk pattern is printed using a printing means into the disk body, it is possible to form a pattern easily and in a short time, no matter how complex the pattern. can.

Furthermore, by preparing a variety of films, any type of disc pattern can be formed on the disc.

[Brief explanation of the drawing]

Figures 1 to 41 are for showing a disk for an optical encoder according to the present invention. Figure 1 is a plan view showing the disk before insert molding, and Figure 2 is a plan view showing the film before molding. , Figure 3 is an enlarged sectional view of the disk, Figure 4 is an enlarged sectional view of the disk.
The figure is a sectional view showing an optical encoder. 4A is a disk body, 4a is a disk pattern, 4b is a disk surface, 6 is a photoreceptor, 9 is a light emitter, and 20 is a film.

Claims (1)

[Claims] Light from the light emitter (9) is transmitted to the disk pattern (4a) formed on the disk surface (4b) of the disk body (4A).
In the disc for an optical encoder, the disc pattern (4a) is arranged on the disc surface (4) and the transmitted light or reflected light is received by the photoreceptor (6).
b), and the film (20) is formed on the disc body (4A) made of resin.
) is integrated into an optical encoder by insert molding.