JPH0310311U - - Google Patents

Info

Publication number
JPH0310311U
JPH0310311U JP2641890U JP2641890U JPH0310311U JP H0310311 U JPH0310311 U JP H0310311U JP 2641890 U JP2641890 U JP 2641890U JP 2641890 U JP2641890 U JP 2641890U JP H0310311 U JPH0310311 U JP H0310311U
Authority
JP
Japan
Prior art keywords
objective lens
detection means
optical
focusing
axis direction
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
JP2641890U
Other languages
Japanese (ja)
Other versions
JPH0643848Y2 (en
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed filed Critical
Priority to JP1990026418U priority Critical patent/JPH0643848Y2/en
Publication of JPH0310311U publication Critical patent/JPH0310311U/ja
Application granted granted Critical
Publication of JPH0643848Y2 publication Critical patent/JPH0643848Y2/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Landscapes

  • Moving Of The Head For Recording And Reproducing By Optical Means (AREA)

Description

【図面の簡単な説明】[Brief explanation of the drawing]

第１図は光集束位置制御装置の一例を示す側断
面図、第２図は本考案の一実施例を示す要部側断
面図、第３図は本考案の一実施例を示すブロツク
図、第４図は本考案の他の実施例を示すブロツク
図である。 １……記録媒体、２……対物レンズ、３……レ
ンズ鏡筒、４……可動コイル、５……軸受、６…
…磁気回路、７……ストツパー、８……光軸、９
……レンズ鏡筒位置光検出器、１０……焦点位置
検出光検知器、１１……駆動回路、１２……光集
束位置制御装置、１３……速度検知手段、１４…
…速度制御回路。 FIG. 1 is a side sectional view showing an example of a light focusing position control device, FIG. 2 is a side sectional view showing an embodiment of the present invention, and FIG. 3 is a block diagram showing an embodiment of the present invention. FIG. 4 is a block diagram showing another embodiment of the present invention. DESCRIPTION OF SYMBOLS 1... Recording medium, 2... Objective lens, 3... Lens barrel, 4... Moving coil, 5... Bearing, 6...
...Magnetic circuit, 7...Stopper, 8...Optical axis, 9
... Lens barrel position photodetector, 10 ... Focus position detection photodetector, 11 ... Drive circuit, 12 ... Light focusing position control device, 13 ... Speed detection means, 14 ...
...Speed control circuit.

Claims (1)

【実用新案登録請求の範囲】[Scope of utility model registration request] 光源から発生された光を記録媒体上に集光する
対物レンズと、その対物レンズを光軸方向に駆動
するフオーカス駆動手段と、前記対物レンズの光
軸方向の運動を案内する軸受と、装置に対する前
記対物レンズの位置を光学的に検知する光学的検
知手段と、前記光学的検知手段の出力信号から前
記対物レンズの速度を検出する速度検知手段とを
具備した、フオーカシング制御を行なう光集束位
置制御装置であつて、フオーカシング制御が開放
にされた時、前記速度検知手段の信号がほぼ一定
となるよう前記フオーカス駆動手段によつて前記
対物レンズを駆動することを特徴とする光集束位
置制御装置。 an objective lens that focuses light generated from a light source onto a recording medium; a focus drive means that drives the objective lens in the optical axis direction; a bearing that guides the movement of the objective lens in the optical axis direction; Light focusing position control for performing focusing control, comprising an optical detection means for optically detecting the position of the objective lens, and a speed detection means for detecting the speed of the objective lens from an output signal of the optical detection means. An optical focusing position control device, characterized in that when focusing control is opened, the objective lens is driven by the focus driving means so that the signal from the speed detection means becomes substantially constant.
JP1990026418U 1990-03-15 1990-03-15 Light focusing position controller Expired - Lifetime JPH0643848Y2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP1990026418U JPH0643848Y2 (en) 1990-03-15 1990-03-15 Light focusing position controller

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP1990026418U JPH0643848Y2 (en) 1990-03-15 1990-03-15 Light focusing position controller

Publications (2)

Publication Number Publication Date
JPH0310311U true JPH0310311U (en) 1991-01-31
JPH0643848Y2 JPH0643848Y2 (en) 1994-11-14

Family

ID=31529312

Family Applications (1)

Application Number Title Priority Date Filing Date
JP1990026418U Expired - Lifetime JPH0643848Y2 (en) 1990-03-15 1990-03-15 Light focusing position controller

Country Status (1)

Country Link
JP (1) JPH0643848Y2 (en)

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5189444A (en) * 1974-12-23 1976-08-05
JPS5257803A (en) * 1975-10-31 1977-05-12 Thomson Brandt Optical reader

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5189444A (en) * 1974-12-23 1976-08-05
JPS5257803A (en) * 1975-10-31 1977-05-12 Thomson Brandt Optical reader

Also Published As

Publication number Publication date
JPH0643848Y2 (en) 1994-11-14

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