JPS6022743A - Pickup for disk reproducer containing information recorded optically - Google Patents
Pickup for disk reproducer containing information recorded opticallyInfo
- Publication number
- JPS6022743A JPS6022743A JP8239484A JP8239484A JPS6022743A JP S6022743 A JPS6022743 A JP S6022743A JP 8239484 A JP8239484 A JP 8239484A JP 8239484 A JP8239484 A JP 8239484A JP S6022743 A JPS6022743 A JP S6022743A
- Authority
- JP
- Japan
- Prior art keywords
- lens
- light
- tracking
- focusing
- optical axis
- 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
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
Landscapes
- Optical Recording Or Reproduction (AREA)
Abstract
Description
【発明の詳細な説明】
本発明は光学的に情報を記録したディスク、主としてビ
デオディスクプレーヤーのピックアップの改良に関する
ものである。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an improvement in the pickup of optically recorded information discs, primarily video disc players.
光学的に情報を記録したディスク、主に光学式ビデオデ
ィスのプレーヤーのピックアップの働きとしては読み取
りビームをディスク面に集束させるフォーカシングと、
読み取りビームを情報トラックに追従させるトラッキン
グとがあり、さらに場合によっては読み取りビームをト
ラック方向に動かして読み取り信号の時間調節も行なう
。従来フォーカシングは対物レンズを光軸方向に動かし
、トラッキングはガルバノミラ−を動かして対物レンズ
に入射づる読取り用のビームを傾けてそれぞれ行なって
いた。The pickup function of a player for optically recorded information on discs, mainly optical video discs, is to focus the reading beam onto the disc surface.
Tracking involves making the reading beam follow the information track, and in some cases also moving the reading beam in the direction of the track to adjust the timing of the read signal. Conventionally, focusing was performed by moving the objective lens in the optical axis direction, and tracking was performed by moving a galvanometer mirror to tilt the reading beam incident on the objective lens.
以下の説明はビデオディスクプレーヤーについて行なう
。第１図に従来の方式によるビデオディスクプレーヤー
の読取り系の構成を示ず。The following description will refer to a video disc player. FIG. 1 does not show the configuration of the reading system of a conventional video disc player.
レーザ光源１から放射される光ビームはビームスリッタ
２を通過してビーム拡大レンズ３によって拡がったビー
ムとなって、ガルバノミラ−４に入射する。ガルバノミ
ラ−４で反射された光ビームは対物レンズ５によってデ
ィスク面６に集束し、ディスク面６上では径１００μｍ
程痩の光点となる。ディスク６は１８００ｐｐｍで回転
しているが、ディスク６の機械的な歪みは避けられない
のでディスク面６と対物レンズ５の距離、及びディスク
面にあるトラックと対物レンズ５との相対位置は絶えず
変動し、そのため上述のフォーカシング及びトラッキン
グ動作が必要となる。この例ではフォーカシングは対物
レンズ５を光軸方向に動かすことにより行ない、トラッ
キングはガルバノミラ−４を回動させて対物レンズに入
射する光ビームを傾けることにより行なっている。なお
ディスク面６で反射した光は再び対物レンズ５、ガルバ
ノミラ−４等を通ってビームスプリッタ２で反射され、
受光器７によって受光されて電気信号に変換される。A light beam emitted from a laser light source 1 passes through a beam slitter 2, becomes a beam expanded by a beam expanding lens 3, and enters a galvanometer mirror 4. The light beam reflected by the galvanometer mirror 4 is focused on the disk surface 6 by the objective lens 5, and has a diameter of 100 μm on the disk surface 6.
It becomes a faint light spot. Although the disk 6 is rotating at 1800 ppm, mechanical distortion of the disk 6 is unavoidable, so the distance between the disk surface 6 and the objective lens 5 and the relative position between the track on the disk surface and the objective lens 5 constantly change. However, the above-mentioned focusing and tracking operations are therefore required. In this example, focusing is performed by moving the objective lens 5 in the optical axis direction, and tracking is performed by rotating the galvanometer mirror 4 to tilt the light beam incident on the objective lens. Note that the light reflected by the disk surface 6 passes through the objective lens 5, galvanometer mirror 4, etc. again, and is reflected by the beam splitter 2.
The light is received by the light receiver 7 and converted into an electrical signal.
このようなビデオディスクプレーヤーにおいては、通常
対物レンズ５は開口数０．４〜０．４５を有することが
要求され、ディスク６には１ｍｍ程度の厚さの保護層が
設けられているので、作動距離はこれより大きくする必
要があり、対物レンズ５はディスク６の反射面から２〜
３ｍｍの距離に置く必要がある。したがってレンズ５の
有効径は７〜８ＩｌｌＩｌｌとする必要があり、その重
量は３ｇｒ程度となってしまい、大幅な軽量化は望めな
い。又ガルバノミラ−４もこの対物レンズ５に有効な光
ビームを照射させるためにレンズ径と同程度の径、実験
によれば１０ｍｍ程度を必要とし、やはり大幅な軽量化
は望めない。したがってフォーカシング、トラッキング
を行なうために対物レンズ５、ガルバノミラ−４を相当
の高速度で動かすためには大きな力が必要となり、装置
の機構は大がかりなものとなり、消費する電力も大きく
ならざるを得なかった。In such a video disc player, the objective lens 5 is normally required to have a numerical aperture of 0.4 to 0.45, and the disc 6 is provided with a protective layer about 1 mm thick, so that the operation The distance needs to be larger than this, and the objective lens 5 is located 2 to 3 degrees from the reflective surface of the disk 6.
It must be placed at a distance of 3mm. Therefore, the effective diameter of the lens 5 needs to be 7 to 8IllIll, and its weight is about 3gr, so a significant weight reduction cannot be expected. Furthermore, in order to irradiate the objective lens 5 with an effective light beam, the galvanometer mirror 4 also requires a diameter comparable to that of the lens, approximately 10 mm according to experiments, and a significant weight reduction cannot be expected. Therefore, a large amount of force is required to move the objective lens 5 and galvano mirror 4 at a considerably high speed for focusing and tracking, and the mechanism of the device becomes large-scale, and the power consumption also becomes large. Ta.
本発明の目的は簡単な構成でかつ小型軽量゛、低消費電
力のど、ツクアップの構造を提供することにある。An object of the present invention is to provide a simple structure, small size, light weight, and low power consumption.
本発明は光学的に情報を記録、したディスク再生装首に
おいて、ディスク上に読取り用光束を集束させるだめの
対物レンズの手前に配置した軽量のリレーレンズと、こ
のリレーレンズを光軸方向に動かして上記読取り用光束
のフォーカシングを行なう手段と、上記リレーレンズを
光軸と直角な方向に動かして上記読取り用光束のトラッ
キングを行なう手段とを設けたことを特徴とするもので
ある。The present invention uses a lightweight relay lens placed in front of an objective lens to focus a reading beam onto the disk, and a light-weight relay lens that is moved in the optical axis direction in a disk playback device that optically records information. The present invention is characterized in that it includes means for focusing the reading light beam, and means for tracking the reading light beam by moving the relay lens in a direction perpendicular to the optical axis.
以下図面につき本発明の詳細な説明する。The invention will now be described in detail with reference to the drawings.
第２図は本発明によるピックアップ機構を採用したビデ
オディスク読取り系の光学的な構成を示す線図である。FIG. 2 is a diagram showing the optical configuration of a video disc reading system employing the pickup mechanism according to the present invention.
第１図と同じ部分については共通の番号を付１ノでいる
。本発明においては第１図のガルバリミラー４を省き、
さらに対物レンズ５′を固定されたものとし゛（いる。The same parts as in Figure 1 are given the same number as 1. In the present invention, the galvanic mirror 4 shown in FIG. 1 is omitted,
Furthermore, the objective lens 5' is assumed to be fixed.
その代わりにビーム拡大レンズとして小さなリレーレン
ズ３′例えば口径１ｍｍ 、重量０．１（ｌｒ以下を用
い、これを各方向に可動としている。すなわち光軸方向
、つまり矢印六方向にリレーレンズ３−を移動させれば
このレンズ３′によって光ビームが集束する位置が変わ
り、したがって対物レンズ５−によって集束する位置も
変わり焦点調節がなされる。さらにトラックの走査、す
なわちトラックの移動方向が紙面に垂直な方向であると
すると、矢印Ｂ方向に光ビームを偏向させることにより
トラッキングを行なうわけであるが、これはリレーレン
ズ３′を矢印Ｂ′力方向移動させてやることにより行な
われる。このように本発明に於いては小さく、したがっ
て軽量なリレーレンズを各方向に動かすことによってフ
ォーカシング、トラッキング調整を行なうことができる
ので、駆動機構は簡単化することができ、寸法的にも消
費電力の点からも従来例より優れている。なおリレーレ
ンズは光軸に垂直な光ビームのみを取り扱えばよいので
、簡単な構成とすることができ、したがって軽量、小型
とす、ることができる。又さらにディスクの回転むら等
による読出し信号の時間的なずれを補償したい場合には
上記リレーレンズ３′を第２図の紙面に垂直な方向に動
かしてやればよい。Instead, a small relay lens 3' with an aperture of 1 mm and a weight of 0.1 lr or less is used as a beam expanding lens, and is movable in each direction.In other words, the relay lens 3' is moved in the optical axis direction, that is, in the six directions of the arrows. When moved, the position at which the light beam is focused by this lens 3' changes, and therefore the position at which the light beam is focused by the objective lens 5- changes as well, and focus adjustment is performed. In this case, tracking is performed by deflecting the light beam in the direction of arrow B. This is done by moving the relay lens 3' in the direction of arrow B'. In the invention, focusing and tracking adjustments can be made by moving a small and therefore lightweight relay lens in each direction, which simplifies the drive mechanism and reduces both size and power consumption. This is superior to the conventional example.The relay lens only needs to handle the light beam perpendicular to the optical axis, so it can be made simple, lightweight and compact.Furthermore, the relay lens can handle only the light beam perpendicular to the optical axis. If it is desired to compensate for a temporal shift in the readout signal due to uneven rotation, etc., the relay lens 3' may be moved in a direction perpendicular to the paper plane of FIG.
第３図は本発明によるビデオディスク読取り装置の実施
例の電気回路をも含めた構成を示す線図である。第２図
と共通の符号は同じ働きをもつ部分を示している。レー
ザ光源１を出た光ビームは回折格子８によって第０次、
１次、＝１次回折光に分けられ、さらに偏光プリズム２
によるビームスプリッタを通過して、その後４分の１波
長板９によって円偏光となる。円偏光となったこれ等の
レーザービームはリレーレンズ３′、対物レンズ５′を
通ってビデオディスク面６′に読み取り光点及びトラッ
キング用光点として集束する。ビデオディスク面６′で
反射した光ビームは再び対物レンズ５′、リレーレンズ
３′を通って４分の１波長板９に入り再び直線偏光にな
る。この直線偏光の偏光面はレーザー光源のレーザ光の
偏光面とは直角方向となっている。したがって偏光プリ
ズム２′で反射されて受光器７′、’Ｍ−の方向に向う
。受光器７′はトラッキング用のもので２つの受光器か
ら成り、それぞれ第１次回折光、第２次回折光の反射光
を受光してこの２つの受光器出力の差を差動増幅器１０
でめて、これがトラッキング用信号となる。受光器７″
はフォーカシング用及び読取り信号検出用のもので４分
割された受光領域をもっていて、第０次回折光の反射光
を受光する。第１次回折光は何らかの方法で非常収差を
もってディスク面６−に集束するようにされているので
、ディスク面６′が対物レンズ５′の光軸方向に動いて
焦点が外れると受光素子７″の受光面に投影される像の
形が変化する。受光素子７″の４分割された受光領域の
各領域に入射する光■を比較することによりこの形の変
化を捉えてフォーカシング用の情報を取り出す。具体的
には対向する対向する受光領域に入射する光量の和とお
しの差を差動増幅器１１でめてこれをフォーカシング用
の信号としている。これ等の詳細については特開昭５０
−１０５３９号公報、特開昭５１−１４１６５１０公報
等に記載されており、周知であるのでここでは詳細は述
べない。FIG. 3 is a diagram showing the configuration of an embodiment of the video disc reading device according to the present invention, including an electric circuit. The same reference numerals as in FIG. 2 indicate parts having the same function. The light beam emitted from the laser light source 1 is divided by the diffraction grating 8 into the 0th order,
It is divided into 1st-order, = 1st-order diffracted light, and is further divided into polarizing prism 2.
The light passes through a beam splitter, and then becomes circularly polarized light by a quarter-wave plate 9. These circularly polarized laser beams pass through a relay lens 3' and an objective lens 5' and are focused on the video disc surface 6' as a reading light spot and a tracking light spot. The light beam reflected by the video disk surface 6' passes through the objective lens 5' and the relay lens 3' again, enters the quarter-wave plate 9, and becomes linearly polarized light again. The polarization plane of this linearly polarized light is perpendicular to the polarization plane of the laser light from the laser light source. Therefore, it is reflected by the polarizing prism 2' and goes towards the light receiver 7', 'M-. The light receiver 7' is for tracking and consists of two light receivers, each of which receives the reflected light of the first-order diffraction light and the second-order diffraction light, and the difference between the outputs of these two light receivers is sent to the differential amplifier 10.
This becomes the tracking signal. Receiver 7″
has a light receiving area divided into four parts for focusing and reading signal detection, and receives the reflected light of the 0th order diffracted light. The first-order diffracted light is converged onto the disk surface 6- with extraordinary aberration in some way, so when the disk surface 6' moves in the optical axis direction of the objective lens 5' and is out of focus, the light receiving element 7'' The shape of the image projected on the light-receiving surface changes.By comparing the light incident on each of the four divided light-receiving areas of the light-receiving element 7'', this change in shape is captured and information for focusing is extracted. . Specifically, the differential amplifier 11 calculates the difference between the sum and the amount of light incident on the opposing light-receiving areas, and uses this as a signal for focusing. For details on these, please refer to the Japanese Patent Application Publication No.
It is described in Japanese Patent Laid-open No. 10539, Japanese Patent Laid-Open No. 51-1416510, and is well known, so the details will not be described here.
このようにして増幅器１０．１１の出力に得られたフォ
ーカシング及びトラッキング用の信号に応じてリレーレ
ンズ３′を第２図において説明したように動かし、フォ
ーカシング及びトラッキングを行なう。In response to the focusing and tracking signals thus obtained at the outputs of the amplifiers 10.11, the relay lens 3' is moved as explained in FIG. 2 to perform focusing and tracking.
なお、受光素子７″の４分割受光領域から得られる信号
の総和はレコード６′のトラックの情報を表わ寸読出し
信号どなることはもちろんである。もしディスク６′の
回転むら等に基く読出し信号の時間ずれを補正したと時
には情報処理回路１２を設けて時間ずれを検出し、これ
によってタイムベースコレクタ信号すなわち時間調整信
号をつくり出し、この信号で第２図で上述しｌζように
リレーレンズ３′をトラック方向に動かしてやればよい
。It should be noted that the sum of the signals obtained from the four-divided light-receiving area of the light-receiving element 7'' represents the track information of the record 6'.Of course, the readout signal will be different.If the readout signal is due to uneven rotation of the disk 6', etc. When the time lag has been corrected, an information processing circuit 12 is provided to detect the time lag, thereby producing a time base collector signal, that is, a time adjustment signal, and using this signal to operate the relay lens 3' as described above in FIG. All you have to do is move it toward the track.
次にリレーレンズ３′をこのように各方向に駆動する機
構について第４図、第５図に示す。Next, a mechanism for driving the relay lens 3' in each direction in this manner is shown in FIGS. 4 and 5.
第４図はリレーレンズ駆動機構の光軸に沿った断面図で
ある。リレーレンズは円筒形にフランジのついた形状の
ルンズ枠１３に取り付けられ、レンズ枠１３はばね１４
及びダンパー１５を介してマグネット１６に取り付けら
れている。ばね１４はレンズ３′の光軸方向に曲がり、
レンズ３′の半径方向にも伸縮性を有するものであり、
したがってレンズ３−１枠１３は光軸方向、半径方向に
動くことができる。さらにレンズ枠１３にはコイルボビ
ン１７が取り付けられていて、これに第５図に示す構造
のコイルが形成されている。第５図＜ａ ＞はコイルの
斜視図、第５図（ｂ）はコイルを光軸方向から見た図で
ある。図示するようにボビン１７０表面には４つのプリ
ントコイル１８〜２１が設けられ、コイル１８と２０．
１９と２１が互いに対向している。これ等のプリントコ
イルの上には図示しない絶縁層が設けられ、さらにその
上には通常のコイル２２が巻かれている。FIG. 4 is a sectional view of the relay lens drive mechanism taken along the optical axis. The relay lens is attached to a cylindrical lens frame 13 with a flange, and the lens frame 13 is attached to a spring 14.
and is attached to a magnet 16 via a damper 15. The spring 14 bends in the direction of the optical axis of the lens 3',
It also has elasticity in the radial direction of the lens 3',
Therefore, the lens 3-1 frame 13 can move in the optical axis direction and the radial direction. Furthermore, a coil bobbin 17 is attached to the lens frame 13, and a coil having the structure shown in FIG. 5 is formed on this. FIG. 5 <a> is a perspective view of the coil, and FIG. 5(b) is a view of the coil viewed from the optical axis direction. As shown in the figure, four printed coils 18 to 21 are provided on the surface of the bobbin 170, and coils 18, 20.
19 and 21 are facing each other. An insulating layer (not shown) is provided on these printed coils, and a normal coil 22 is further wound on top of the insulating layer.
マグネット１６によってギャップ２３には磁界が形成さ
れているのでコイル１８と２０に適当な方向の電流産流
せばコイルボビン１７は光軸と直角な方向に動き、コイ
ル１９と２１に電流を流せばこれと直角な方向に動く。A magnetic field is formed in the gap 23 by the magnet 16, so if current is applied to the coils 18 and 20 in an appropriate direction, the coil bobbin 17 will move in a direction perpendicular to the optical axis, and if current is applied to the coils 19 and 21, this will occur. move at right angles.
又コイル２２に電流を流ずとボビン１７は光軸方向に動
く。したがってこれ等につれてレンズ３′も各々方向に
動き、各コイルに流す電流によってレンズ３′を上述し
た各方向に動かすことができることになる。Furthermore, when no current is applied to the coil 22, the bobbin 17 moves in the optical axis direction. Therefore, the lens 3' also moves in each direction along with these, and the lens 3' can be moved in each of the above-mentioned directions by the current flowing through each coil.
なお本発明は上述した実施例に限られるものではなく、
例えば焦点検出のために上述の例では非点収差を用いて
いたが他の適当な構成でもよく、又リレーレンズを各方
向に駆動する機構も上述の実施例に限られるものではな
い。又ビデオディスク再生装置に限らず、例えば音楽情
報を記録したディスク再生装置等にも使用できることは
もちろんである。Note that the present invention is not limited to the above-mentioned embodiments,
For example, although astigmatism was used in the above example for focus detection, other suitable configurations may be used, and the mechanism for driving the relay lens in each direction is not limited to the above embodiment. It goes without saying that the present invention can be used not only for video disk playback devices but also for example for disk playback devices on which music information is recorded.
本発明によれば軽損なリレーレンズを動かすことにより
フォーカシング、トラッキング等を行なうことができる
ので駆動機構が簡単になり、又低消費エネルギーとなり
、さらに高速で正確な制御が可能である。According to the present invention, focusing, tracking, etc. can be performed by moving a light relay lens, which simplifies the drive mechanism, consumes less energy, and enables high-speed and accurate control.
第１図は従来のビデオディスク再生装置の光学的構成を
示す線図、第２図は本発明によるフォーカシング及びト
ラッキング機構を採用したビデオディスク再生装置の光
学的機構を示す線図、第３図は本発明によるビデオディ
スク再生装置の一実施例の電気的、光学的構成を示す線
図、第４図はリレーレンズを各方向に動かず機構の一例
を示す線図、第５図（ａ）および（ｂ）はリレーレンズ
を各方向に動かすコイルの斜視図および光軸方向から見
た線図である。
１・・・レーザ光源、２・・・ビームスプリッタ、２′
・・・偏光プリズムのビームスプリッタ、３′・・・リ
レーレンズ、４・・・トラッキング用ミラー、５・・・
対物レンズ、５′・・・固定対物レンズ、６，６′・・
・ビデオディスク、７・・・受光器、７′・・・トラッ
キング用受光器、７″・・・フォーカシングビデオ情報
読取用受光器、８・・・回折格子、９・・・４分の１波
長板、１０．１１・・・差動増幅器、１２・・・時間情
報処理回路、。
第１図
第２図
第３図
第４図
第５図
ｂFIG. 1 is a diagram showing the optical configuration of a conventional video disc playback device, FIG. 2 is a diagram showing the optical structure of a video disc playback device employing the focusing and tracking mechanism according to the present invention, and FIG. A diagram showing the electrical and optical configuration of an embodiment of the video disc playback device according to the present invention, FIG. 4 is a diagram showing an example of a mechanism that does not move the relay lens in each direction, and FIGS. (b) is a perspective view of a coil that moves the relay lens in each direction and a line diagram seen from the optical axis direction. 1... Laser light source, 2... Beam splitter, 2'
... Polarizing prism beam splitter, 3'... Relay lens, 4... Tracking mirror, 5...
Objective lens, 5'...Fixed objective lens, 6,6'...
・Video disc, 7... Light receiver, 7'... Tracking receiver, 7''... Light receiver for reading focusing video information, 8... Diffraction grating, 9... Quarter wavelength Board, 10.11... Differential amplifier, 12... Time information processing circuit. Figure 1 Figure 2 Figure 3 Figure 4 Figure 5 b
Claims (1)
、ディスク上に読取り用光束を集束さけるための対物レ
ンズの手前に配置した軽量のリレーレンズと、このリレ
ーレンズを光軸方向に動かして上記読取り用光束のフォ
ーカシングを行なう手段と、上記リレーレンズを光軸と
直角な方向に動かして上記読取り用光束のトラッキング
を行なう手段とを設けたことを特徴とするピックアップ
装置。 ２、特許請求の範囲第１ Ｉｎ記載のピックアップ装置
において上記リレーレンズを上記トラッキングのための
移動方向及びフォーカシングのための移動方向とほぼ直
角方向に動かして上記読取り用光束の時間調整を行なう
ようにしたことを特徴とするピックアップ装置。[Claims] 1. In a disc playback device that optically records information, a lightweight relay lens is provided in front of an objective lens to avoid converging a reading beam onto the disc, and the relay lens is connected to the optical axis. A pickup device comprising means for focusing the reading light beam by moving the relay lens in a direction perpendicular to the optical axis, and means for tracking the reading light beam by moving the relay lens in a direction perpendicular to the optical axis. 2. In the pickup device according to claim 1 In, the relay lens is moved in a direction substantially perpendicular to the moving direction for tracking and the moving direction for focusing to adjust the time of the reading light beam. A pickup device characterized by:
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP8239484A JPS6022743A (en) | 1984-04-24 | 1984-04-24 | Pickup for disk reproducer containing information recorded optically |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP8239484A JPS6022743A (en) | 1984-04-24 | 1984-04-24 | Pickup for disk reproducer containing information recorded optically |
Related Parent Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2678A Division JPS5494007A (en) | 1978-01-05 | 1978-01-05 | Pickup for disc recorder recorded optically with information |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS6022743A true JPS6022743A (en) | 1985-02-05 |
| JPH0555934B2 JPH0555934B2 (en) | 1993-08-18 |
Family
ID=13773368
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP8239484A Granted JPS6022743A (en) | 1984-04-24 | 1984-04-24 | Pickup for disk reproducer containing information recorded optically |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6022743A (en) |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS62282286A (en) * | 1986-05-30 | 1987-12-08 | Furuno Electric Co Ltd | Measurement of flow speed |
| JPH01314987A (en) * | 1988-06-16 | 1989-12-20 | Nissan Motor Co Ltd | Doppler type speedometer |
| JPH0413238A (en) * | 1990-04-30 | 1992-01-17 | Samsung Electron Co Ltd | Optical head using optical scanner |
| US5222056A (en) * | 1989-03-30 | 1993-06-22 | Asahi Kogaku Kogyo K.K. | Optical pickup apparatus having a compact structure |
| WO2001037272A1 (en) * | 1999-11-18 | 2001-05-25 | Fujitsu Limited | Optical storage |
| JP2002228903A (en) * | 2001-01-30 | 2002-08-14 | Olympus Optical Co Ltd | Optical unit |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS51134604A (en) * | 1975-04-30 | 1976-11-22 | Thomson Brandt | Optical reader |
-
1984
- 1984-04-24 JP JP8239484A patent/JPS6022743A/en active Granted
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS51134604A (en) * | 1975-04-30 | 1976-11-22 | Thomson Brandt | Optical reader |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS62282286A (en) * | 1986-05-30 | 1987-12-08 | Furuno Electric Co Ltd | Measurement of flow speed |
| JPH01314987A (en) * | 1988-06-16 | 1989-12-20 | Nissan Motor Co Ltd | Doppler type speedometer |
| US5222056A (en) * | 1989-03-30 | 1993-06-22 | Asahi Kogaku Kogyo K.K. | Optical pickup apparatus having a compact structure |
| JPH0413238A (en) * | 1990-04-30 | 1992-01-17 | Samsung Electron Co Ltd | Optical head using optical scanner |
| WO2001037272A1 (en) * | 1999-11-18 | 2001-05-25 | Fujitsu Limited | Optical storage |
| US6704268B2 (en) | 1999-11-18 | 2004-03-09 | Fujitsu Limited | Optical storage device and optical pickup unit having track control |
| JP2002228903A (en) * | 2001-01-30 | 2002-08-14 | Olympus Optical Co Ltd | Optical unit |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0555934B2 (en) | 1993-08-18 |
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