Optical pickup with improved optical properties
AssigneeMatsushita Electric Industrial Co., Ltd.
InventorsHideyuki Nakanishi, Shoichi Takasuka, Shinichi Ijima, Akio Yoshikawa, Kazutoshi Onozawa, Kazuhiko Yamanaka, Naoki Nakanishi
Life of this patent
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Abstract
A movable enclosure contains optical components, such as an objective lens, a semiconductor laser, a mirror, and a photodetector. The movable enclosure is supported by a fixed member via a plurality of wires that are positioned in parallel. This construction allows the movable enclosure to move in a tracking direction and a focusing direction. The plurality of wires are insulated from one another to be also used as power-supplying lines and signal lines for the semiconductor laser and the photodetector.
Claims38
An optical pickup, comprising:
- a semiconductor laser for emitting a laser beam;
- an objective lens for focusing the emitted laser beam on an optical recording medium;
- a first member for carrying at least the semiconductor laser and the objective lens;
- a second member;
- and
- a plurality of supporting members that are elastic and each contain a first portion and a second portion which are respectively connected to the first member and the second member, wherein the second member supports the first member via the plurality of supporting members in a manner that allows the first member to move in predetermined directions with respect to the second member,
- wherein the plurality of supporting members include at least two supporting members that are electrically conductive, and
- wherein the at least two electrically conductive supporting members include electrically conductive supporting members that function as lines to conduct power to the semiconductor laser.
A method for manufacturing an optical pickup, the optical pickup including:
- a first member that carries optical components, which include:
- (a) a semiconductor laser component that emits a laser beam;
- and (b) an objective lens that focuses the laser beam onto an optical recording medium;
- a second member;
- and
- a plurality of supporting members that connect the first member with the second member in a manner that allows the first member to move,
- the method including:
- a supporting member positioning step for positioning at least six supporting members between the first member and the second member, the first member and the second member being positioned at a predetermined interval;
- and
- a supporting member connecting step for connecting each supporting member to the first member and to the second member so as to have a substantially uniform stress distributed to each supporting member.
A method for manufacturing an optical pickup, the optical pickup including:
- a first member that carries optical components, which include:
- (a) a semiconductor laser component that emits a laser beam;
- and (b) an objective lens that focuses the laser beam onto an optical recording medium;
- a second member;
- and
- a plurality of supporting members that connect the first member with the second member in a manner that allows the first member to move,
- the method including:
- a plate processing step for processing two electrically conductive plates to form two structural members that have a shape of a plurality of supporting members linked to an outer part of each conductive plate;
- and
- a first member forming step for having the two structural members held so that a predetermined positional relationship between the two structural members can be maintained, and forming at least the first member, out of the first member and the second member, in predetermined portions of the plurality of supporting members.
Dependencies are inferred from the claim text.