JPS597133B2 - Semiconductor laser pickup equipment - Google Patents
Semiconductor laser pickup equipmentInfo
- Publication number
- JPS597133B2 JPS597133B2 JP50064232A JP6423275A JPS597133B2 JP S597133 B2 JPS597133 B2 JP S597133B2 JP 50064232 A JP50064232 A JP 50064232A JP 6423275 A JP6423275 A JP 6423275A JP S597133 B2 JPS597133 B2 JP S597133B2
- Authority
- JP
- Japan
- Prior art keywords
- semiconductor laser
- light
- information
- recording section
- information recording
- 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.)
- Expired
Links
Classifications
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
- G11B7/08—Disposition or mounting of heads or light sources relatively to record carriers
- G11B7/09—Disposition or mounting of heads or light sources relatively to record carriers with provision for moving the light beam or focus plane for the purpose of maintaining alignment of the light beam relative to the record carrier during transducing operation, e.g. to compensate for surface irregularities of the latter or for track following
- G11B7/0908—Disposition or mounting of heads or light sources relatively to record carriers with provision for moving the light beam or focus plane for the purpose of maintaining alignment of the light beam relative to the record carrier during transducing operation, e.g. to compensate for surface irregularities of the latter or for track following for focusing only
Landscapes
- Optical Recording Or Reproduction (AREA)
- Optical Head (AREA)
Description
【発明の詳細な説明】
本発明はビテイオデイスク等の情報担体上の微小部分（
約１μｍ”〜１０μｍ”）に振幅もしくは位相情報とし
て記録された情報を読み出す時系列光読み出し装置に関
するものである。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a microscopic portion (
The present invention relates to a time-series optical readout device that reads out information recorded as amplitude or phase information in a range of about 1 μm" to 10 μm".
本発明は、埋ヘテロ型レーザ等に見られる点光源状の半
導体レーザからの出射光をこの半導体レーザと一体化さ
れた軽量な小型光集束手段により点光源像に結像せしめ
るものである。The present invention focuses the light emitted from a point light source-shaped semiconductor laser, such as a buried hetero type laser, into a point light source image using a lightweight and compact light focusing means integrated with the semiconductor laser.
このように一体化された小型で軽量な光照射手段は容易
に加振器を用いて振動させることが可能となり、情報担
体上のトラック上のピットを追跡することが可能となり
、情報の安定な読み出しが可能となる。さらに本発明の
すぐれている点は、上記の小型集束手段が光軸上の一点
の物体を光軸上の一点に結像せしめるだけでよく、安価
に作製できることにある。すなわち従来の方法では、光
源とレンズの間に可動ミラーを配置し、可動ミラーによ
りトラック上のビットを追跡していた。この場合レンズ
には斜めから光が入射することになり、この影響を考え
てレンズを設計しなければならなかつた。以上説明した
ごとく、本発明により、従来用いていた可動ミラーと高
価なレンズ等を用いす安価で小型、軽量の光照射手段と
力ｐ振器を用いて時系列光読み出しが可能となる。以下
実施例により詳しく説明する。This integrated compact and lightweight light irradiation means can be easily vibrated using an exciter, making it possible to track the pits on the track on the information carrier, thereby making it possible to stabilize the information. Reading becomes possible. A further advantage of the present invention is that the above-mentioned compact focusing means only needs to focus an object at a single point on the optical axis to a single point on the optical axis, and can be manufactured at low cost. That is, in the conventional method, a movable mirror is placed between a light source and a lens, and the movable mirror tracks the bit on the track. In this case, light would enter the lens from an angle, and the lens had to be designed with this effect in mind. As explained above, according to the present invention, time-series optical readout becomes possible using an inexpensive, small, and lightweight light irradiation means and a force-p oscillator that use conventionally used movable mirrors, expensive lenses, and the like. This will be explained in detail below using examples.
第１図は本発明の実施例を示す図である。１は半導体レ
ーザ、１’は１個もしくは複数個の半導体レーザの点光
源である。FIG. 1 is a diagram showing an embodiment of the present invention. 1 is a semiconductor laser, and 1' is a point light source of one or more semiconductor lasers.
２はこの１個もしくは複数個の半導体レーザ点光源の少
なくとも１個の点光源を光軸近辺になるように配置され
た光集束手段である。Reference numeral 2 denotes a light focusing means arranged so that at least one point light source of the one or more semiconductor laser point light sources is near the optical axis.
この光集束手段と上記半導体レーザは一体化され光照射
手段３となる。この光照射手段により出射した集束ビー
ムは情報担体５の上にある情報記録部（トラック上のビ
ット）５’を照射する。この情報担体は駆動機構６によ
り駆動（回転）される。ピット５’に照射された光は情
報担体５を透過もしくは反射し、その際にピット５’の
形状に応じた回折光を生する。この回折光を光検知器等
の手段から構成される情報読出し装置Ｔにより、記録情
報を復現する。情報担体に記録された情報は駆動機構６
による駆動により、螺旋もしくは同心円状に配列された
ピットが光照射手段より出射される集束ビームを次々と
横切る結果、時系列的に再生される。この際情報担体の
駆動に伴なつて、情報記録部（トラツク上のピツト）は
振動する。この振動に伴なつて集束ビーム位置を振動さ
せなければ、情報を読み出すことができない。第１図４
は光照射手段３全体を上記情報記録部の振動に応じて、
加振する加振器である。すなわち、この振動は情報読出
装置７の光検出器によつて、検出され、この検出信号を
もとに加振器４が作動される。なお、このような情報記
録部の振動、すなわち光ビーム集束位置と情報記録部と
の位置のずれを検出する手段としては、種々のものが公
知であり、例えば、特開昭４９−６０７０２号公報に開
示された技術を用いることができる。情報記録部のｘ−
ｙ−ｚ方向の振動のうち振動の大きい１力向以上の方向
に対し、力１振器４により光照射手段３を振動せしめる
。本発明の半導体レーザピツクアツプ装置の特徴は先に
述べたごとく、半導体レーザ１と、光集束手段２を一体
化し、これを加振器４により加振する点にある。この場
合光集束手段は光軸上の一点から発した光を光軸上の一
点に結像させるものであればよい。従つて単レJャYもし
くは複数のレンズの組み合わせ、でもよいしそれ自体周
知のホログラムレンズ、もしくはキノホームを用いても
容易に達成できる。This light focusing means and the semiconductor laser are integrated to form a light irradiation means 3. The focused beam emitted by this light irradiation means irradiates an information recording section (bits on a track) 5' on the information carrier 5. This information carrier is driven (rotated) by a drive mechanism 6. The light irradiated onto the pits 5' is transmitted or reflected by the information carrier 5, and at this time, diffracted light is generated depending on the shape of the pits 5'. This diffracted light is used to reproduce recorded information by an information reading device T comprising means such as a photodetector. The information recorded on the information carrier is transferred to the drive mechanism 6
As a result of driving, the pits arranged in a spiral or concentric pattern successively cross the focused beam emitted from the light irradiation means, thereby being reproduced in a time-series manner. At this time, the information recording section (pit on the track) vibrates as the information carrier is driven. Information cannot be read unless the focused beam position is vibrated along with this vibration. Figure 1 4
The entire light irradiation means 3 is caused to vibrate in accordance with the vibration of the information recording section.
It is a vibrator that excites vibrations. That is, this vibration is detected by the photodetector of the information reading device 7, and the vibrator 4 is operated based on this detection signal. Various methods are known as means for detecting vibrations of the information recording section, that is, misalignment between the light beam focusing position and the information recording section. The technique disclosed in can be used. Information recording section x-
The light irradiation means 3 is caused to vibrate by the force oscillator 4 in one or more force directions in which the vibration is large among the vibrations in the y-z directions. As mentioned above, the feature of the semiconductor laser pickup device of the present invention is that the semiconductor laser 1 and the light focusing means 2 are integrated, and this is excited by the vibrator 4. In this case, the light focusing means may be of any type as long as it focuses the light emitted from one point on the optical axis onto one point on the optical axis. Therefore, it can be easily achieved by using a single lens or a combination of multiple lenses, or by using a hologram lens or kinoform, which are well known per se.
第１図は本発明の１実施例図である。 FIG. 1 is a diagram showing one embodiment of the present invention.
Claims (1)
ムを所定情報担体上の情報記録部に集束せしめるための
光集束手段とを一体化せしめた光照射手段と、該光照射
手段を加振する加振器と、上記光ビームの集束位置と上
記情報記録部との位置のずれを検知する手段とを有し、
該手段からの出力信号により上記加振器を駆動制御する
ことを特徴とする半導体レーザピックアップ装置。1. A light irradiation means that integrates a semiconductor laser and a light focusing means for focusing the light beam emitted from the semiconductor laser onto an information recording section on a predetermined information carrier, and an excitation device that vibrates the light irradiation means. and a means for detecting a positional deviation between the focal position of the light beam and the information recording section,
A semiconductor laser pickup device characterized in that the vibrator is driven and controlled by an output signal from the means.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP50064232A JPS597133B2 (en) | 1975-05-30 | 1975-05-30 | Semiconductor laser pickup equipment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP50064232A JPS597133B2 (en) | 1975-05-30 | 1975-05-30 | Semiconductor laser pickup equipment |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS51140702A JPS51140702A (en) | 1976-12-03 |
| JPS597133B2 true JPS597133B2 (en) | 1984-02-16 |
Family
ID=13252158
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP50064232A Expired JPS597133B2 (en) | 1975-05-30 | 1975-05-30 | Semiconductor laser pickup equipment |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS597133B2 (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| NL176315C (en) * | 1976-05-12 | 1985-03-18 | Philips Nv | OPTICAL SCANNER. |
| JPS55112752U (en) * | 1979-01-25 | 1980-08-08 | ||
| JP4882888B2 (en) * | 2007-06-27 | 2012-02-22 | 日本精工株式会社 | Rolling bearing fixing device |
-
1975
- 1975-05-30 JP JP50064232A patent/JPS597133B2/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| JPS51140702A (en) | 1976-12-03 |
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