JP2523961B2 - Non-magnetic base material - Google Patents

Description

TECHNICAL FIELD The present invention relates to a compact disc (C
The present invention relates to a non-magnetic base member used for the actuator of D).

2. Description of the Related Art Conventionally, as this type of base member component, a component formed by sintering a magnetic material or a component formed by combining a plurality of magnetic sheet metal materials has been used. Further, the contact surface with the optical base was formed into a spherical surface.

DISCLOSURE OF THE INVENTION Problems to be Solved by the Invention However, in the conventional base member component as described above, in the case where it is formed by sintering the magnetic material, it is difficult to assemble another component, and the magnetic material causes Since the magnetic flux distribution is not uniform due to the change in direction, it has been difficult to give the shape of the base member so as not to adversely affect the servo characteristics for operating the actuator.

Further, in the case of forming a plurality of sheet metal magnetic materials, it is necessary to accurately position each member, which complicates the manufacturing process, and since it is sheet metal processing, there is a limit to the shape that can be processed. It was difficult to adjust the optical axis.

Furthermore, since there is a restriction on the shape surface that the contact portion with the optical base is formed of a spherical surface, it is difficult to manufacture it by processing one sheet metal material.

The present invention has been made to solve the above conventional problems, and an object of the present invention is to provide a base member that improves the assembling property and does not affect the magnetic characteristics.

Means for Solving the Problems In order to achieve the above object, the present invention forms a bottom portion and side portions rising from both sides of the bottom portion integrally with a non-magnetic material, and performs optical axis adjustment on the bottom surface of the bottom portion. For this purpose, three protrusions that come into contact with the spherical surface of the optical base are provided, protrusions for positioning the suspension holder are provided on both sides of one of the side face portions, and the vertical direction of the magnet is set inside each side face portion. The protrusion is provided for positioning.

Effect Therefore, according to the present invention, by integrally forming the whole with a non-magnetic material, it is possible to facilitate positioning with another component such as a suspension holder or a magnet. Further, the optical axis of the optical base can be smoothly adjusted, and the base member is made of a non-magnetic material, so that the direction of the lines of magnetic force does not change and the magnetic flux distribution is made uniform. Therefore, it is possible to prevent the servo characteristics from being adversely affected and to stably operate the actuator.

Examples Hereinafter, the configuration of the present invention will be described in more detail with reference to the examples shown in the drawings.

FIG. 1 is a perspective view showing an embodiment of the non-magnetic base member of the present invention, and FIG. 2 is a front view of the same.

As shown in the figure, the base member 1 is formed by integrally forming a bottom surface portion 2 and side surface portions 3 and 4 rising from both sides of the bottom surface portion 2 with a single non-magnetic sheet metal material.

A light passage hole 2a is opened in the center of the bottom surface portion 2, and three projecting portions 2b that come into contact with an optical base (not shown) are provided on the lower surface thereof. This protrusion 2b
Is a device in which the tip portion is formed in a hemispherical shape so that the three spherical surfaces on the surface of the optical base are simultaneously in contact with each other so that the optical axis can be adjusted smoothly.

As described above, since the three protrusions 2b are adapted to correspond to the contact with the spherical surface of the optical base, it is not necessary to form the bottom of the base member into a spherical surface, and the base member 1 can be easily integrated with one sheet metal material. It has a shape that can be formed.

Of the side surface portions 3 and 4, projecting pieces 5 and 6 are provided outwardly at the lower portion of one side surface portion 4 and one side edge portion in a direction perpendicular to the side surface portions 3 and 4, respectively. An optical axis adjusting screw (not shown) is screwed into the screw holes 5a and 6a formed in the projecting pieces 5 and 6, respectively.

On both sides of the side surface portion 3, a protrusion 3 for holding and positioning the protrusions 7a, 7a of the suspension holder 7 shown in FIG.
a and 3a are provided. Further, inside the side surface portion 3, protrusions 3b, 3b for positioning and holding the magnet in the vertical direction are provided. A magnet holding protrusion 4b similar to the protrusion 3b is also provided inside the other side surface 4.

As described above, since the base member 1 is integrally formed of the bottom surface portion 2 and the side surface portions 3 and 4 with a single sheet metal material, positioning of the individual components is performed like a yoke formed by combining a plurality of members. You don't have to. Further, since the protrusions 3a, 3b, 4b for positioning and holding the components to be incorporated in the base member 1 are provided and the structure allows the components to be fixed from above, the components can be easily assembled and assembled. You can

FIG. 4 is an exploded perspective view showing an assembled state of the non-magnetic base member of the present invention constructed as described above in the CD actuator, in which the base member 1 positions and holds the magnet 8 and also the suspension holder. 7 is positioned and held, and is attached to the actuator flexible substrate 9 via the suspension holder 7.

In the figure, 10 to 15 are parts mounted on the base member 1, 10 is a bobbin, 11 is a bobbin substrate, 12 is a tube, 13
Is a wire, 14 is an objective lens, and 15 is an actuator cover.

EFFECTS OF THE INVENTION As described above, according to the present invention, the bottom surface portion and the side surface portions rising from both sides of the bottom surface portion are integrally formed of a non-magnetic material, and the bottom surface of the bottom surface is brought into contact with the optical base spherical surface for optical axis adjustment. Three protrusions are provided, protrusions for positioning the suspension holder are provided on both sides of one of the side faces, and protrusions for positioning the magnet in the vertical direction are provided inside each of the side faces. Since it is configured, it is not necessary to form a surface with a complicated shape, so it can be formed of a non-magnetic material that is wholly integrated, and it can be positioned with another component such as a suspension holder or magnet. As a result, the assemblability can be improved and the optical axis of the optical base can be smoothly adjusted, and the base part can be easily adjusted. By forming the material with a non-magnetic material, the direction of the lines of magnetic force does not change, so that the magnetic flux distribution can be made uniform, the servo characteristics are prevented from being adversely affected, and the actuator operates stably. You can

[Brief description of drawings]

FIG. 1 is a perspective view showing an embodiment of a non-magnetic base member of the present invention, FIG. 2 is a front view thereof, FIG. 3 is a perspective view of a suspension holder, and FIG. 4 is a non-magnetic base member of the present invention. It is an exploded perspective view showing an assembled state of a CD actuator in which a body base member is incorporated. 1 ... Base member, 2 ... Bottom part, 2b ... Projection part, 3, 4
...... Side surface, 3a ...... Suspension holder positioning projections, 3b, 4b ...... Magnet positioning projections, 7 ...
… Suspension holder, 8… Magnet.

Front page continuation (72) Inventor Tsukasa Nakayama 4-3-1, Tsunashima-higashi, Kohoku-ku, Yokohama-shi, Kanagawa Matsushita Communication Industrial Co., Ltd. (72) Koichi Sakai 4--3 Tsunashima-higashi, Kohoku-ku, Yokohama-shi, Kanagawa No. 1 Matsushita Communication Industry Co., Ltd.

Claims (1)

(57) [Claims] 1. A bottom portion and side portions rising from both sides of the bottom portion are integrally formed of a non-magnetic material, and the bottom surface of the bottom portion is in contact with an optical base spherical surface to adjust an optical axis.
Individual protrusions are provided, protrusions for positioning the suspension holder are provided on both sides of one of the side faces, and protrusions for positioning the magnet in the vertical direction are provided inside each side face. Non-magnetic base member.