Optical pickup

Abstract

An optical pickup that improves recording and reproducing performances on a disc without increasing the cost includes first and second magnets. The first magnet is placed on protrusions provided to a first wall portion of a base of an actuator portion. Both end portions of the bottom surface of the first magnet, the first wall portion on a surface facing a second wall portion, and a pedestal are adhered together by using an UV adhesive. Similarly, a second magnet is placed on protrusions provided to the second wall portion of the base. Both end portions of the bottom surface of the second magnet, the second wall portion on a surface facing the first wall portion, and a pedestal are adhered together by using an UV adhesive.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1A is a cross section cut along A-A line in FIG. 4 showing an actuator portion of an optical pickup according to the present invention.

FIG. 1B is an elevation view in the direction of the arrow B in FIG. 4 showing the actuator portion of the optical pickup according to the present invention.

FIG. 2 is an exploded perspective view of the actuator portion of the optical pickup according to the conventional example and the present invention.

FIG. 3 is a finished perspective view of the actuator portion of the optical pickup according to the conventional example and the present invention.

FIG. 4 is a top view of a base to which magnets are adhered of the actuator portion of the optical pickup according to the conventional example and the present invention.

FIG. 5A is a cross section cut along A-A line in FIG. 4 showing the actuator portion of the conventional optical pickup.

FIG. 5B is an elevation view in the direction of the arrow B in FIG. 4 of the actuator portion of the conventional optical pickup.

Claims

1. An optical pickup, comprising: a pedestal;a first wall portion and a second wall portion both protruding from the pedestal and facing each other;at least one first protrusion provided to the first wall portion on a first surface that faces the second wall portion;at least one second protrusion provided to the second wall portion on a second surface that faces the first wall portion;a first magnet placed on the first protrusion in contact with the first surface;a second magnet placed on the second protrusion in contact with the second surface; anda lens holder for retaining an objective lens, the lens holder moving and/or rotating between the first and the second magnets,wherein the first magnet at least at one position on a bottom surface thereof, the first surface, and the pedestal are adhered together by using an adhesive, and the second magnet at least at one position on a bottom surface thereof, the second surface, and the pedestal are adhered together by using an adhesive.

2. The optical pickup according to claim 1, wherein both end portions of the bottom surface of the first magnet, the first surface, and the pedestal are adhered together by using an adhesive, and both end portions of the bottom surface of the second magnet, the second surface, and the pedestal are adhered together by using an adhesive.

3. The optical pickup according to claim 1, wherein the adhesive is an UV adhesive that is curable by irradiation with ultraviolet rays.

4. The optical pickup according to claim 2, wherein the adhesive is an UV adhesive that is curable by irradiation with ultraviolet rays.

5. An optical pickup, comprising: a pedestal;a first wall portion and a second wall portion both protruding from the pedestal and facing each other;at least one first protrusion provided to the first wall portion on a first surface that faces the second wall portion;at least one second protrusion provided to the second wall portion on a second surface that faces the first wall portion;a first magnet placed on the first protrusion in contact with the first surface;a second magnet placed on the second protrusion in contact with the second surface; anda lens holder for retaining an objective lens, the lens holder moving and/or rotating between the first and the second magnets,wherein both end portions of the bottom surface of the first magnet, the first surface, and the pedestal are adhered together by using an UV adhesive, and both end portions of the bottom surface of the second magnet, the second surface, and the pedestal are adhered together by using an UV adhesive.