JPS58173032U

JPS58173032U - Focus lens movement control device in optical equipment

Info

Publication number: JPS58173032U
Application number: JP6851682U
Authority: JP
Inventors: 草野　諭
Original assignee: パイオニアビデオ株式会社
Priority date: 1982-05-11
Filing date: 1982-05-11
Publication date: 1983-11-18

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 drawings]

第１図は従来のフォーカスレンズ移動制御装置のブロッ
ク図、第２図は第１図の装置の動作タイミングチャート
、第３図は本考案の実施例回路図、第４図は第３図の回
路の動作波形図、第５図及び第６図は第３図の回路にお
ける１部変形例を夫々示す図である。主要部分の符号の説明、１・・・・・・フォーカスエラ
ー信号発生器、３・・・・・・ループスイッチ、７・・
・・・・ゼ　　　　′ロクロス検出器、１９・・・・・
・充放電スイッチ、Ｃ１・・・・・・コンデンサ。 −丁ｔＩ１４ｃま　工・Fig. 1 is a block diagram of a conventional focus lens movement control device, Fig. 2 is an operation timing chart of the device shown in Fig. 1, Fig. 3 is a circuit diagram of an embodiment of the present invention, and Fig. 4 is a circuit shown in Fig. 3. 5 and 6 are diagrams showing partial modifications of the circuit of FIG. 3, respectively. Explanation of symbols of main parts, 1...Focus error signal generator, 3...Loop switch, 7...
...Zero Cross Detector, 19...
・Charge/discharge switch, C1...Capacitor. -DingtI14c Ma Engineering・

Claims

[Scope of utility model registration request]

a focus servo loop that controls the vertical movement of the focus lens by a focus error signal corresponding to a vertical position of the focus lens with respect to the light irradiation body; and a focus servo loop that controls the vertical movement of the focus lens while opening the focus servo loop. servo retracting means for controlling and turning on the focus servo loop when the focus error signal level reaches a predetermined value;
A focus lens movement control device for an optical device, comprising a lens return means for controlling reciprocating movement of the focus lens in the vertical direction during a period in which light passing through the light irradiation body is absent during the operation of the servo retraction means, The lens return means includes a power storage element and a means for charging and discharging the power storage element so that the terminal voltage of the power storage element repeatedly changes between a first and a second level, and the charging and discharging means An apparatus characterized in that the focus lens is moved in both directions during each period.