Objective lens support
A supporting device and objective lens technology, applied in the direction of installation, head configuration/installation, optics, etc., can solve problems such as unbalanced suspension wire erection position, deterioration of optical performance, and difficult insertion of suspension wires
Inactive Publication Date: 2006-08-09
SANYO ELECTRIC CO LTD
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Problems solved by technology
[0006] However, each hole of the lens barrel and the base plate is usually a round hole, and in order to allow the suspension wire to be inserted smoothly, a margin must be left for the diameter of the hole relative to the diameter of the suspension wire.
[0007] Therefore, the support position of each suspension wire in the lens barrel and the base plate is different from the other end side due to the margin range, and the erection position of each suspension wire is unbalanced. Therefore, when the objective lens is displaced during tracking and focusing, The posture of the objective lens changes, causing deterioration in optical performance
[0008] In order to solve such a problem, if the margin of each hole diameter of the lens barrel and the base plate to the diameter of the suspension wire is reduced, it will be difficult for the suspension wire to be inserted into each of the above-mentioned holes, resulting in a significant drop in work efficiency.
Method used
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Embodiment Construction
[0017] Frame 1 is formed by sheet metal processing of soft iron plates, and installed on frame 1:
[0018] External forks 4, 5, on which a pair of permanent magnets 2, 3 facing each other are respectively attached; and
[0019] The inner fork pieces 6, 7 are respectively fixed on the permanent magnets 2, 3 in an opposing state.
[0020] And, the fixing part 1a which fixes the supporting part 8 by screws is integrated with the frame 1, and when the wiring board 9 fixes the supporting part 8 on the above-mentioned fixing part 1a, the positioning pin 8a formed on the supporting part 8 is used to place the supporting part on the supporting part 8. 8 to be positioned and fixed together with the supporting member 8.
[0021] The objective lens 11 is installed on the lens barrel 10, and, on the lens barrel 10, is wound respectively:
[0022] a focusing coil 12 wound to surround the entire circumference of the side surface of the lens barrel 10, and
[0023] Tracking coils 13 are a...
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The present invention provides an objective lens support to solve the problem of the deterioration of optical performance due to the unbalance in the position where each suspension wire is constructed, in which the supporting positions of one end side and the other end side of each suspension wire are deviated. In support parts 16 of a lens holder 10 each supporting an end side or the other end side of the suspension wire 14 and in support parts 16 of a support member 8 which is fixed on a frame 1, the support surfaces for the suspension wire 14 in the gravitational direction are formed like a V shape so that one end side and the other end side of each suspension wire 14 are supported by the V shape support surfaces of the support part 16 of the lens holder 10 and the support part 16 of the support member 8, respectively. Thus, the positioning is established in the state that one end side and the other end side of each suspension wire 14 abut on the V shape two sides of the support surfaces by the own weight thereof.
Description
technical field [0001] The present invention relates to an objective lens supporting device included in an optical head for reading or writing signals to a signal recording medium such as a disc. Background technique [0002] The objective lens support device generally uses elastic support parts to connect the lens barrel where the objective lens is installed with the frame, so that the lens barrel is supported by the frame in an elastic manner and can be displaced. [0003] Most of the above-mentioned elastic support parts adopt suspension wires, and each end side of a plurality of (usually 4) suspension wires is fixed on the lens barrel, and the other end side of each suspension wire is fixed to the base plate installed on the frame at the same time, and the Above-mentioned each suspension wire makes the lens barrel be supported on the frame in an elastic state and can be displaced. [0004] However, generally, holes for inserting the respective suspension wires are forme...
Claims
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IPC IPC(8): G11B7/09G02B7/02
CPCG11B7/0932G11B7/0933G11B7/1374
Inventor 吉永千佳士大野嘉威
Owner SANYO ELECTRIC CO LTD