JPH01296438A - Optical head of optical tape device - Google Patents
Optical head of optical tape deviceInfo
- Publication number
- JPH01296438A JPH01296438A JP12572488A JP12572488A JPH01296438A JP H01296438 A JPH01296438 A JP H01296438A JP 12572488 A JP12572488 A JP 12572488A JP 12572488 A JP12572488 A JP 12572488A JP H01296438 A JPH01296438 A JP H01296438A
- Authority
- JP
- Japan
- Prior art keywords
- objective lens
- optical
- tape
- cylinder
- optical head
- 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.)
- Pending
Links
Landscapes
- Optical Recording Or Reproduction (AREA)
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
【発明の詳細な説明】
〔産業上の利用分野〕
本発明はテープ状の光記録媒体を用いて光学式記録再生
を行う光テープ装置に係わり、特に画像などの記録再生
を行うＶＴＲ装置の光ヘッドに関するものである。[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to an optical tape device that performs optical recording and playback using a tape-shaped optical recording medium, and particularly relates to an optical tape device that performs optical recording and playback using a tape-shaped optical recording medium, and particularly relates to an optical tape device that uses a tape-shaped optical recording medium to perform optical recording and playback. It is related to the head.
低速度で移動する光テープに対して、光ヘッドを組込ん
だシリンダが速度で回転することによりテープに対して
光スポットが斜めに走行し、記録再生するヘリカルスキ
ャン方式の光テープ装置が考えられる。この種の装置と
しては、たとえば特開昭５８−６６６４などがあげられ
る。A helical-scan type optical tape device is conceivable, in which an optical tape moves at a low speed, and a cylinder incorporating an optical head rotates at a high speed, causing a light spot to travel diagonally to the tape, recording and playing back. . An example of this type of device is the one disclosed in Japanese Patent Application Laid-Open No. 58-6664.
このシリンダの回転速度は例えば９０ Ｈｚと高速であ
るため、シリンダ外周部にある対物レンズには大きな遠
亮力がかかる。対物レンズの重さを５ｇ、シリンダ中心
から対物レンズまでの距離を２５Ｉｎとすると、約４ｋ
ｇの遠心力が対物レンズにかかる。この力によって対物
レンズの位置がオフセットするとこれを補正するため、
自動焦点サーボ系の駆動回路に無駄なパワーが必要とな
ったり自動焦点補正誤差が残ったりする。Since the rotational speed of this cylinder is high, for example, 90 Hz, a large distance illumination force is applied to the objective lens located on the outer periphery of the cylinder. If the weight of the objective lens is 5g and the distance from the center of the cylinder to the objective lens is 25In, approximately 4k
A centrifugal force of g is applied to the objective lens. In order to compensate for the offset of the objective lens position due to this force,
The drive circuit for the autofocus servo system requires unnecessary power and autofocus correction errors remain.
シリンダが定格速度で回転しているときに、対物レンズ
系にかかる遠心力と対物レンズ支持部材の弾性力が光ス
ポット焦点付近でつりあうようにあらかじめ対物レンズ
支持部材をシリンダ内周側にオフセットして取付ける。When the cylinder is rotating at the rated speed, the objective lens support member is offset toward the inner circumference of the cylinder in advance so that the centrifugal force applied to the objective lens system and the elastic force of the objective lens support member are balanced near the focal point of the light spot. Install.
これにより、遠心力の影響はキャンセルされ、自動焦点
サーボ系は光ヘッドと光テープ間距離の変動だけを補正
することになる。As a result, the influence of centrifugal force is canceled, and the autofocus servo system corrects only the variation in the distance between the optical head and the optical tape.
本発明の実施例を第１図を用いて詳細に説明する。本実
施例では発明の構成を明確にするため光ヘツド全体の構
成は単純化して示しており、シリンダ内の光ヘッドは１
つとしているが、本発明ではその構造や光ヘッドの個数
を限定するものではない。An embodiment of the present invention will be described in detail using FIG. In this embodiment, in order to clarify the structure of the invention, the overall structure of the optical head is shown in a simplified manner.
However, the present invention does not limit the structure or the number of optical heads.
光テープ２はプーリ４を介して回転するシリンダ６に螺
旋状に巻きついて低速度で移動している。The optical tape 2 is spirally wound around a rotating cylinder 6 via a pulley 4 and is moving at a low speed.
シリンダ６内の発光受光部８と対物レンズ１０によって
光スポットが光テープ２上に結像してあらかじめ光テー
プ２上に記録された案内トラック（図示せず）に沿って
ヘリカルスキャンが行われ、信号の記録再生が行われる
。シリンダ６の真円度やシリンダ回転中心の偏心などに
より対物レンズ１０の焦点が光テープ２からずれると、
図示されていない自動焦点制御装置は対物レンズ１０を
支持する圧電アクチュエータ１２を駆動し、この焦点ず
れを補正するように対物レンズ１０と光テープ間の距離
を変えて自動焦点制御を行う。A light spot is imaged on the optical tape 2 by the light emitting/receiving section 8 in the cylinder 6 and the objective lens 10, and a helical scan is performed along a guide track (not shown) recorded in advance on the optical tape 2. Signals are recorded and reproduced. If the focus of the objective lens 10 deviates from the optical tape 2 due to the roundness of the cylinder 6 or the eccentricity of the cylinder rotation center,
An automatic focus control device (not shown) drives a piezoelectric actuator 12 that supports the objective lens 10, and performs automatic focus control by changing the distance between the objective lens 10 and the optical tape so as to correct this focal shift.
シリンダが定格速度で回転している時、対物レンズ１０
と圧電アクチュエータ１２のシリンダ６への固定部との
距離りは、シリンダ停止時の長さＬ′より、対物レンズ
に加わる遠心力と圧電アクチュエータ１２の寸法、ヤン
グ率などで決まる長さ△Ｌだけ伸びるので、圧電アクチ
ュエータ１２は、シリンダ停止時の光学的設計位置より
あらかじめこの長さΔＬだけシリンダ内側にずらして固
定されている。When the cylinder is rotating at the rated speed, the objective lens 10
The distance between the fixed part of the piezoelectric actuator 12 to the cylinder 6 is a length △L determined by the centrifugal force applied to the objective lens, the dimensions of the piezoelectric actuator 12, Young's modulus, etc. than the length L' when the cylinder is stopped. Since the piezoelectric actuator 12 can be extended, the piezoelectric actuator 12 is fixed in advance by being shifted inside the cylinder by this length ΔL from the optically designed position when the cylinder is stopped.
本実施例では、対物レンズの支持部材と対物レンズのア
クチュエータを兼ねた構成となっているが、これらが別
々のものであっても本発明は適用できる。In this embodiment, the support member for the objective lens and the actuator for the objective lens are configured to both function, but the present invention can be applied even if these are separate members.
以上のべたごとく、本発明によれば、遠心力による対物
レンズ位置オフセットの影響がキャンセルされ、自動焦
点サーボ系は光ヘッドと光テープ間距離の変動だけを補
正するので、対物レンズ駆動回路に無駄なパワーを必要
とせず、自動焦点補正誤差が残ったりする問題がなくな
る。As described above, according to the present invention, the effect of objective lens position offset due to centrifugal force is canceled, and the autofocus servo system corrects only the fluctuation in the distance between the optical head and the optical tape, so there is no waste in the objective lens drive circuit. It does not require a large amount of power, and eliminates the problem of residual autofocus correction errors.
Claims (1)
う回転シリンダに組込まれた光ヘッドにおいて、対物レ
ンズを変位させてテープ状媒体上に常に記録再生用光ス
ポットの焦点を結ばせる自動焦点サーボ系を構成するに
あたり、シリンダが目標速度で回転しているときに、対
物レンズ系にかかる遠心力と対物レンズの支持部材の弾
性力が光スポット焦点付近でつりあうようにあらかじめ
対物レンズ支持部材を取付けたことを特徴とする光テー
プ装置の光ヘッド。1. In an optical head built into a rotating cylinder that uses light to record and reproduce information on a tape-shaped medium, the objective lens is displaced to constantly focus the recording and reproduction light spot on the tape-shaped medium. When configuring the autofocus servo system, the objective lens is supported in advance so that when the cylinder rotates at the target speed, the centrifugal force applied to the objective lens system and the elastic force of the objective lens support member are balanced near the focal point of the light spot. An optical head of an optical tape device, characterized in that a member is attached.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP12572488A JPH01296438A (en) | 1988-05-25 | 1988-05-25 | Optical head of optical tape device |
| US07/239,389 US4970707A (en) | 1987-09-04 | 1988-09-01 | Optical tape apparatus with a tracking control mechanism and/or a focusing control mechanism |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP12572488A JPH01296438A (en) | 1988-05-25 | 1988-05-25 | Optical head of optical tape device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH01296438A true JPH01296438A (en) | 1989-11-29 |
Family
ID=14917201
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP12572488A Pending JPH01296438A (en) | 1987-09-04 | 1988-05-25 | Optical head of optical tape device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH01296438A (en) |
-
1988
- 1988-05-25 JP JP12572488A patent/JPH01296438A/en active Pending
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