JP2004163145A - Optical encoder - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To solve the problem that an exclusive tool is needed and inertia of a stop ring increases when the stop ring is used for fixing a rotating disk, and the problem that sufficient strength is not obtained if an adhered area is small when an adhesive agent is used for fixing the rotating disk. <P>SOLUTION: In the optical encoder equipped with the rotating disk and a hub to which the rotating disk is fixed, one or more grooves are formed, on the contact surface side with the hub, in the rotating disk, and the disk is fixed to the hub by coating and filling the groves with an adhesive agent for fixing the disk to the hub. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to an optical encoder for detecting a rotation position and a rotation speed of a motor.
[0002]
[Prior art]
As a method of fixing a rotating disk of a conventional optical encoder, there is known a method of fixing using a retaining ring having a plurality of staggered claw portions (for example, see Patent Document 1).
For fixing the rotating disk, a method of providing a groove on the hub side, filling the groove with an adhesive, and fixing the disk to the hub is also generally used.
FIG. 4 shows the contents of Patent Document 1 as a first conventional example. In FIG. 4, reference numeral 21 denotes a rotating disk of the optical encoder, which has a plurality of cutouts 21b in the center hole. Reference numeral 22 denotes a hub for receiving the rotary disk 21. The hub 22 has a convex portion 22a for guiding the center hole of the rotary disk 21 and a groove 22b on the mounting surface of the rotary disk 21. The retaining ring 23 has a plurality of pawls, the upper pawl 23a is press-fitted and fixed to the convex portion 22a of the hub 22, and the lower pawl 23b of the retaining ring 23 is located at a position corresponding to the notch 21b of the rotating disk 21. The hub 22 is fixed at the position of the groove 22b.
FIG. 5 shows a second conventional example, which is a method of fixing only by bonding which is generally used as a fixing method. The rotating disk 1 is bonded and fixed to a hub 3 with an adhesive 2.
[0003]
[Patent Document 1]
JP 2000-329584 A
[Problems to be solved by the invention]
However, in the first conventional example, since a retaining ring is used to fix the rotating disk, a dedicated jig is required, inertia of the retaining ring is increased, and a contact area between the rotating disk and the hub is increased. However, there is a problem that it cannot be adopted if the size cannot be large. In the second conventional example, when the contact area between the rotating disk and the hub cannot be made large, there is a problem in the reliability of the adhesive force.
An object of the present invention is to provide an optical encoder which has a simple structure, is low in cost, has a high adhesive strength to a rotating disk, and has excellent reliability in order to solve such a problem.
[0005]
[Means for Solving the Problems]
In order to solve the above problem, the rotating disk is provided with one or more grooves on the contact surface side with the hub, or one or more through holes on the contact surface with the hub, and the groove or the through hole has the An adhesive for fixing the rotating disk and the hub is applied and filled.
[0006]
DETAILED DESCRIPTION OF THE INVENTION
By using the above-mentioned means, sufficient adhesive strength can be obtained only by adhesive fixing, so that the retaining ring can be eliminated, cost can be reduced, and the inertia of the retaining ring is eliminated, so that the performance of the entire motor is improved. . Further, even when the contact area between the rotating disk and the hub cannot be made large, it can be adopted.
In particular, when the present invention is applied to an etched disk, a particularly excellent effect can be expected because an adhesive groove can be formed at the time of forming a slit of a rotating disk.
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 shows a side cross section in a first embodiment of the present invention. In FIG. 1, an adhesive groove 4 is formed on the adhesive surface of the rotating disk 1. The bonding groove 4 is provided at one or more locations, and the shape and depth are arbitrary. The material of the rotating disk is not limited to a glass rotating disk or an etching rotating disk. However, in order to make the most of the present invention, a rotating disk made of etching is more desirable. The rotating disk 1 and the hub 3 are fixed with an adhesive 2.
FIG. 2 shows a side cross section according to a second embodiment of the present invention. This is an example in which the groove in FIG. 1 is changed to a through hole 6, and the basic configuration is the same as that of the first embodiment.
FIG. 3 shows a side cross section according to a second embodiment of the present invention. This is an application example used when the bonding area between the rotating disk 1 and the hub 3 cannot be made large and the bonding strength is insufficient. Although the basic configuration is the same as that of the first embodiment, a sufficient adhesive strength can be obtained by adding an adhesive groove 5 to the contact surface of the hub 3 with the rotating disk 1. The bonding groove 5 is provided at one or more locations, and the shape and the depth are arbitrary.
[0007]
【The invention's effect】
As described above, according to the present invention, since the retaining ring can be eliminated, the cost can be reduced, and the contact area between the rotating disk and the hub cannot be increased, and when the adhesive strength is insufficient. By adding an adhesive groove to the adhesive surface of the rotating disk on the hub side, sufficient adhesive strength can be obtained, and there is an effect that it is possible to achieve an improvement in adhesive strength, reliability and cost reduction.
[Brief description of the drawings]
FIG. 1 is a side sectional view of a first embodiment of the present invention.
FIG. 2 is a side sectional view of a second embodiment of the present invention.
FIG. 3 is a side sectional view of a third embodiment of the present invention.
FIG. 4 is a side sectional view of a first conventional example.
FIG. 5 is a side sectional view of a second conventional example.
[Explanation of symbols]
REFERENCE SIGNS LIST 1 rotating disk 2 adhesive 3 hub 4, 5 bonding groove 6 through hole 21 rotating disk 21 b notch 22 hub 22 a convex portion 22 b groove 23 retaining ring 23 a upper claw 23 b lower claw

Claims (3)

In an optical encoder including a rotating disk and a hub to which the rotating disk is fixed,
The rotating disk has one or more grooves on the contact surface side with the hub,
An optical encoder characterized in that the groove is filled with an adhesive for fixing the rotating disk and the hub. In an optical encoder including a rotating disk and a hub to which the rotating disk is fixed,
The rotating disk has one or more through holes on a contact surface with the hub,
An optical encoder characterized in that the through hole is filled with an adhesive for fixing the rotating disk and the hub. The hub has one or more grooves on the contact surface side with the rotating disk, and the groove of the hub is filled with an adhesive for fixing the rotating disk and the hub. The optical encoder according to claim 1.

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