JPS5963826U

JPS5963826U - Objective lens holding structure in optical disc playback device

Info

Publication number: JPS5963826U
Application number: JP15696182U
Authority: JP
Inventors: 古角　博司
Original assignee: 旭光学工業株式会社
Priority date: 1982-10-19
Filing date: 1982-10-19
Publication date: 1984-04-26

Abstract

(57)【要約】本公報は電子出願前の出願データであるた
め要約のデータは記録されません。(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Brief explanation of the drawing]

第１図から第３図までは従来の対物レンズ保持構造を説
明する図であり、第１図は構造全体を示す断面図、第２
図は第１図の保持部材に対物レンズが取り付けられた状
態のみを取り出して示した平面図、第３図は保持部材の
斜視図、第４図はこの考案に係る保持部材の斜視図であ
る。１２・・・対物レンズ、１３・・・ディスク、１３ａ・
・・ピット面、９０・・・保持部材、９１・・・貫通孔
、Ｆ・・・駆動機構。1 to 3 are diagrams for explaining the conventional objective lens holding structure, and FIG. 1 is a sectional view showing the entire structure, and
The figure is a plan view showing only the state in which the objective lens is attached to the holding member of Fig. 1, Fig. 3 is a perspective view of the holding member, and Fig. 4 is a perspective view of the holding member according to this invention. . 12... Objective lens, 13... Disk, 13a.
... Pit surface, 90 ... Holding member, 91 ... Through hole, F ... Drive mechanism.

Claims

[Scope of utility model registration request]

(1) It has an objective lens that focuses a beam for detecting recorded information on the pit surface of the disk and is held by a holding member of a predetermined shape made of an elastic material, and the objective lens is placed in a specific plane with respect to the disk. In an objective lens holding structure for an optical disc playback device that is equipped with a drive mechanism that drives the drive mechanism in a specific direction according to a drive designation, the shape of the holding member is adjusted to suppress an increase in the second moment of area with respect to the drive designation direction. An objective lens holding structure in an optical disc playback device, characterized in that the structure is modified to increase the second moment of area with respect to other directions.

(2) To increase the moment of inertia of the area, gradually increase the thickness or width of the holding member in a certain direction, and to suppress the increase in the moment of inertia of the area, adjust the opening width or number of through holes penetrated in a predetermined direction. An objective lens holding structure in an optical disc playback device according to claim 1, characterized in that:

(3) The holding member has a substantially constant thickness in the direction specified for driving, an appropriate number of through holes in that direction, and a width in a direction perpendicular to the direction excluding the through holes. The utility model according to claim 1 or 2, characterized in that the sum of the widths of the portions is formed substantially constant in the height direction perpendicular to the width direction and the thickness direction, respectively. Objective lens holding structure in an optical disc playback device.