JPS62290345A - Locking motor with optical encoder - Google Patents

Abstract

PURPOSE:To reduce volume occupied by an encoder unit, by a method wherein a housing of a motor has function as a support member of a light emission element. CONSTITUTION:A housing 2 of a motor comprises a motor drive member, for example, a permanent magnet group to constitute a magnetic circuit, a yoke and the like. Among these members, the yoke 12 is provided with a hole at portion with little influence of the magnetic circuit, and a light emission element 7 is installed thereto. On the other hand, in a light receiving section, a stationary slit plate support member 13 with a stationary slit plate 4 and a light receiving element 5 fixed thereon is installed to the yoke 12. Further, a rotary slit plate support member 8 with a rotary slit plate 9 fixed thereon is installed to a rotary shaft 1 so that the rotary slit plate 9 is held in a gap between the stationary slit plate 4 and the light emission element 7.

Description

Detailed Description of the Invention 3. Detailed Description of the Invention (a) Field of Industrial Application The present invention relates to a swing motor with an optical encoder. More specifically, this is a configuration of a swing motor with an optical encoder that enables high-speed positioning control when performing positioning control using a swing motor with an optical encoder, which is often used in hard disk magnetic storage devices, etc. It is related to.

(B) Conventional technology Conventionally, a swing motor is a swing motor that rotates at a predetermined angle in a clockwise direction, e.g.
A motor that repeats reciprocating motion by rotating 20 degrees, then rotating the same angle counterclockwise again, and returning to its original position. Furthermore, a swing motor with an optical encoder is a swing motor with an optical encoder that is configured by attaching an optical encoder to this type of motor so that positioning can be controlled at any position within the swing angle. It is often used in storage devices, etc.

Hereinafter, a conventional example will be explained based on the drawings. FIG. 1 shows a sectional view of a swing motor with an optical encoder.
The fixed slit plate support member 3 to which the fixed slit plate 4 and the light receiving element 5 are fixed is attached. Further, the light emitting element support member 6 to which the light emitting element 5 is fixed is fixed to the slit plate support member 3.
Attach to. Further, the rotating slit plate 9 is attached to the rotating slit plate supporting member 8 to which the rotating slit plate 9 is fixed.
and the fixed slit plate 4.

In FIG. 1, for example, the motor drive source is the housing 2.
The encoder units are arranged in series in the axial direction. In such a motor with an optical encoder, the restriction on the length in the axial direction largely depends on the longest component in the axial direction among the components constituting the encoder unit. Furthermore, the light emitting element 7 is the longest component in the axial direction,
and.

A predetermined distance is required between the rotating slit plate 9, the fixed slit plate 4, and the light receiving element 5 in order to obtain uniform illuminance.

For these reasons, conventional methods to increase the speed of this type of motor include making the parts that make up the encoder unit thinner to increase the ratio of the motor's volume to the total volume, or increasing the motor's input power. A method was taken.

(c) Problems to be Solved by the Invention However, as shown in FIG. 2, the light-emitting cable 7 is composed of a case 10, a lens 11, etc. in order to obtain uniform illuminance, and there is a limit to how thin it can be. . Therefore, the ratio of the volume of the motor portion to the total volume of the motor with an optical encoder cannot be increased very much, making it difficult to design a motor aiming at higher speeds. On the other hand, there is a method of increasing the input power to the motor, but this method also has drawbacks in terms of power rate, such as increased inertia of the rotating part and increased heat generation.

(d) Means for Solving the Problems The object of the present invention is to solve the above-mentioned problems and to make it possible to increase the speed of a motor equipped with an optical encoder.

Generally speaking, make the required holes in the motor housing,
A light emitting element is housed in this hole. That is, the present invention provides a configuration means for providing the motor housing with a function as a light emitting element supporting member and reducing the proportion of the encoder unit in the total volume of the encoder-equipped motor.

(e) Effects According to the present invention, the volume of the motor part can be increased relative to the total volume of the motor with an optical encoder, so it is possible to configure a motor with an optical encoder that can perform faster positioning control without increasing input power. becomes.

(F) Embodiment Hereinafter, an embodiment of the present invention will be described with reference to the accompanying drawings.

FIG. 3 is a configuration diagram of a swing motor with an encoder according to the present invention. A housing 2 of a swing motor having a rotating shaft 1 is composed of motor drive members, such as a group of permanent magnets forming a magnetic circuit, a yoke, and the like. Among these members, a hole is provided at a position where the influence of the magnetic circuit of the yoke 12 shown in FIG. 3 is small, and one light emitting element 7 is mounted therein. That is, the function as a support member for the light emitting element 7 is added to the magnetic circuit component. On the other hand, in the light receiving section, a fixed slit temporary support member 13 to which a fixed slit plate 4 and a light receiving element 5 are fixed is attached to the yoke 12. Furthermore, by attaching the rotating slit plate supporting member 8 to which the rotating slit plate 9 is fixed to the rotating shaft 1 so that the rotating slit plate 9 is held in the gap between the fixed slit plate 4 and the light emitting element 7, the axis of the encoder unit A configuration in which the length in the direction is reduced becomes possible. Em enables a configuration in which the volume of the motor section is increased without being restricted by the length of the light emitting element compared to the conventional example.

(G) Effects FIG. 4 shows data comparing the acceleration characteristics of the embodiment according to the present invention and the conventional example.

In this test, a constant voltage is applied to the motor rotor when it is stopped, and in order to see how it accelerates in a predetermined direction of rotation, the horizontal axis measures the time after voltage application, and the vertical axis measures the rotational angular velocity. This is what was measured. This test has proven that the speed is faster even when comparing with the same input.

[Brief explanation of drawings]

FIG. 1 is a sectional view showing the configuration of a conventional motor with an optical encoder, FIG. 2 is a schematic diagram showing the configuration of a light emitting element, and FIG. 3 is a sectional view showing the configuration of a motor with an optical encoder according to the present invention. , FIG. 4 is a diagram comparing the acceleration performance of a conventional example and a motor with an optical encoder according to the present invention. 1.Rotating shaft 2.Housing 3.13.
-Fixed slit plate support member 4...Fixed slit plate 5...Light receiving element 6...Light emitting element support member 7...Light emitting element 8...Rotating slit plate support member 9...Rotating slit plate 10...Light emitting element case 11
... Lens 12 ... York Patent Applicant Copal Electronics Co., Ltd. Washi 1 No. zS 16 Yo 01 No. 40

Claims (1)

[Claims] A swing motor having an optical encoder equipped with a light emitting element and a light receiving element, and a rotating slit plate and a fixed slit plate provided in the gap therebetween, characterized in that the light emitting element is provided in the parts constituting the swing motor. Oscillating motor with optical encoder.