JPS5848032U

JPS5848032U - Objective lens drive device for optical information recording and reproducing equipment

Info

Publication number: JPS5848032U
Application number: JP14122181U
Authority: JP
Inventors: 健治朗木目
Original assignee: 三菱電機株式会社
Priority date: 1981-09-22
Filing date: 1981-09-22
Publication date: 1983-03-31

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図はこの考案の一実施例の光学式情報記録再生装置
の対物レンズ駆動装置の正面図を示す。第２図はこの実施例の■−■断面図を示す。第３図はこ
の実施例の可動ヨークの外観図を示す。第４図はこの実
施例のマグネットの磁路分布図を示す。第５図はこの考
案の好ましい実施例の光学式情報記録再生装置の対物レ
ンズ駆動袋装置の断面図を示す。第６図は好ましい実施
例の正面図を示す。図において、１１は対物レンズ、１３はディスク、１３
１は情報トラック、２１は可動ヨーク、２２は焦点制御
コイル、２３は板バネ、２４はハネ支持台、２５はピボ
ット支持部、２６はマグネット、２７は固定ヨーク、２
８はトラック追跡制御コイル、５０は弾性体を示す。FIG. 1 shows a front view of an objective lens driving device of an optical information recording/reproducing apparatus according to an embodiment of this invention. FIG. 2 shows a sectional view taken along the line 1--2 of this embodiment. FIG. 3 shows an external view of the movable yoke of this embodiment. FIG. 4 shows a magnetic path distribution diagram of the magnet of this embodiment. FIG. 5 shows a sectional view of an objective lens driving bag device of an optical information recording/reproducing apparatus according to a preferred embodiment of the present invention. FIG. 6 shows a front view of the preferred embodiment. In the figure, 11 is an objective lens, 13 is a disk, 13
1 is an information track, 21 is a movable yoke, 22 is a focus control coil, 23 is a plate spring, 24 is a spring support base, 25 is a pivot support part, 26 is a magnet, 27 is a fixed yoke, 2
Reference numeral 8 indicates a track tracking control coil, and reference numeral 50 indicates an elastic body.

Claims

[Scope of utility model registration request]

(1) An optical information recording and reproducing device that optically reproduces information recorded on an information track of a recording medium, comprising: a light source; a condensing light source that condenses light from the light source and provides it as a light spot on the recording medium; means, a driving means for driving the light focusing means, and a tracking error correlated to a relative positional deviation between the light spot and the information track and a tracking error correlated to a positional deviation in the optical axis direction of the light from the light source. An objective lens driving device for an optical information recording/reproducing apparatus, comprising a control means for controlling the driving means to correct the focusing means based on a focus error.

(2) The drive means includes: a movement drive means for moving the condensing means up and down in the optical axis direction based on the output of the control means corresponding to the focus error; and an output of the control means corresponding to the tracking error. a rotation driving means for rotating the light condensing means along the information track in the radial direction of the recording medium based on
An objective lens driving device for an optical information recording and reproducing device as set forth in claim (1) of the utility model registration.

(3) The movement drive means is made of a magnetic material and includes a movable yoke forming a hole for accommodating the light condensing means, and a movable yoke that faces the recording medium and moves the movable yaw up and down in the optical axis direction. a first coil wound around the outer circumferential surface of the movable yoke so as to move the movable member up and down in the optical axis direction; An objective lens driving device for an optical information recording/reproducing device according to claim (2) of the utility model registration claim, which comprises a magnetic flux generating means that is provided in a direction and generates a magnetic flux.

(4) The rotation driving means is made of a magnetic material and includes a fixed yoke that is provided on the outer periphery of the movable yoke and in a direction perpendicular to the radial direction of the recording medium; and a fixed yoke that moves on the outer peripheral surface of the fixed yoke. and a second float wound so as to rotate the member along the information track in the radial direction of the recording medium. Objective lens drive device for type information recording and reproducing device.

(5) The magnetic flux generating means generates magnetic flux passing through the movable yoke and the fixed yoke. An objective lens driving device for an optical information recording/reproducing device as set forth in claim (3).

(6) The moving member includes a plate spring, and the plate spring'
The objective lens drive device for an optical information recording and reproducing device as claimed in claim (3) of the utility model registration, wherein the fixing portion for fixing the lens rotates to form a supporting portion in a limp manner.

(7) The moving member has an elastic body attached to the fixed part and rotates about the elastic body as a fulcrum, the objective lens driving device of the optical information recording and reproducing apparatus according to claim (6) of the utility model registration. .

(8) The optical system according to claim 7 of claim 7, wherein the large body is attached to the fixing part so that the center of its rotational displacement is on the central axis of the support part. Objective lens drive device for information recording and reproducing devices.