JPS6035343A - Skew detector - Google Patents

Skew detector

Info

Publication number
JPS6035343A
JPS6035343A JP14225083A JP14225083A JPS6035343A JP S6035343 A JPS6035343 A JP S6035343A JP 14225083 A JP14225083 A JP 14225083A JP 14225083 A JP14225083 A JP 14225083A JP S6035343 A JPS6035343 A JP S6035343A
Authority
JP
Japan
Prior art keywords
optical
luminous flux
light
recording medium
optical disk
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
Application number
JP14225083A
Other languages
Japanese (ja)
Inventor
Tadao Yoshida
忠雄 吉田
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Sony Corp
Original Assignee
Sony Corp
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 by Sony Corp filed Critical Sony Corp
Priority to JP14225083A priority Critical patent/JPS6035343A/en
Publication of JPS6035343A publication Critical patent/JPS6035343A/en
Pending legal-status Critical Current

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
    • G11B7/095—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 specially adapted for discs, e.g. for compensation of eccentricity or wobble
    • G11B7/0956—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 specially adapted for discs, e.g. for compensation of eccentricity or wobble to compensate for tilt, skew, warp or inclination of the disc, i.e. maintain the optical axis at right angles to the disc

Abstract

PURPOSE:To obtain an inexpensive small-sized skew detector by interposing a photodetector which has a couple of photodetection areas where return luminous flux is split into two in a specific direction between a light source and an optical recording medium, and eliminating the need for a beam splitter. CONSTITUTION:Projected luminous flux from a spot light source LD is made into parallel luminous flux, which is transmitted through a transparent or translucent photodetector HD and incident to an optical disk D at right angles, so that its reflected light is incident on the optical disk D. For the photodetector HD, there is used a silicon solar battery, etc. The photodetector HD is provided with photodetection area A-D; combinations of photodetection areas A, D and B, C, and A, B and C, D which are divided into two in directions X' and Y' of projection corresponding to the radial direction X and perpendicular tangential direction Y of the optical disk D, form a couple of photodetection areas for skew detection in both directions. When the optical disk D slants by DELTAtheta in the direction X, the return luminous flux slants by 2DELTAtheta and projection images Q upon the photodetection areas A, D and B, C area are displaced in the direction X' to the position of a projection image P of projected luminous flux. Therefore, the inclination is detected from the difference output between said photodetection areas.

Description

【発明の詳細な説明】 産業上の利用分野 本発明は光学記録媒体の信号面の所定方向での傾きを検
出するスキュー検出装置に関する。DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a skew detection device for detecting the inclination of a signal surface of an optical recording medium in a predetermined direction.

背景技術とその問題点 従来、この種スキュー検出装置としては、いわゆるオー
トコリメーション法を牙ｕ用して第１図に示されるもの
が考えられる。次に第１図を説明する。BACKGROUND TECHNOLOGY AND PROBLEMS Conventionally, as this type of skew detection device, there is a device shown in FIG. 1 that uses a so-called autocollimation method. Next, FIG. 1 will be explained.

点光源としての半導体レーザ（ＬＤｏ）から放射された
光束はコリメータレンズ（Ｃ（几。）及びビームスプリ
ッタ（ＢＳｏ）を順次経由して光学記録媒体になる光デ
ィスク（Ｄｏ）の信号面に入射される。又光ディスク（
ＤＯ）の信号面から反射された戻り光束は、ビームスプ
リッタ（ＢＳｏ）を経由して、夫々出力端を有する受光
域Ａ。％Ｂｏ１Ｃｏ％Ｄｏより構成される差動光検出器
（Ｄ′ｒｏ）に入射される。なお、図示の矢印Ｘ。は光
ディスク（Ｄｏ）のラジアル方向を示し、矢印Ｘ。！は
受光域Ａ。、Ｂｏ１Ｃｏ％Ｄｏ　に投影きれる光ディス
クのラジアル方向を示している。そして第２図に示され
るように投影されるラジアル方向Ｘ。′およびこれと直
角な方向である投影されるクンジエンシャル方向￥６に
て夫々２分されるように構成される一対の受光領域（Ａ
ｏｌＤｏ）と（Ｂ［１％　ｃｏ）、（ＡＯ％　ＢＯ）と
（Ｃ０％　ＤＯ）の出力の差により夫々光ディスク（Ｄ
ｏ）の信号面のラジアル方向及びタンジエンシャル方向
での傾き（スキュー〕が検出される。A light beam emitted from a semiconductor laser (LDo) as a point light source passes through a collimator lens (C) and a beam splitter (BSo) in sequence, and is incident on the signal surface of an optical disc (Do) that becomes an optical recording medium. Also, optical disc (
The return light beam reflected from the signal surface of DO) passes through a beam splitter (BSo) to a light receiving area A, each having an output end. %Bo1Co%Do is input to a differential photodetector (D'ro). Note that the arrow X shown in the figure. indicates the radial direction of the optical disc (Do), and arrow X indicates the radial direction of the optical disc (Do). ! is light receiving area A. , Bo1Co%Do indicates the radial direction of the optical disc that can be projected onto. and the radial direction X projected as shown in FIG. ' and a pair of light-receiving areas (A
The difference between the outputs of (OlDo) and (B[1% co), and (AO% BO) and (C0% DO) makes the optical disc (D
o) The inclination (skew) of the signal plane in the radial direction and tangential direction is detected.

このような従来装置では、点光源側からの出射光束と光
ディスク（Ｄ、）の信号面からの戻り光束とを分離させ
るため、ビームスプリッタ（ＢＳｏ）を必要きしており
、このビームスプリッタ（ＢＳｏ）は高価であることか
ら装置がコスト高となっていた。In such conventional devices, a beam splitter (BSo) is required in order to separate the emitted light beam from the point light source side and the return light beam from the signal surface of the optical disk (D,). ) is expensive, making the equipment expensive.

発明の目的 本発明はこのような従来の問題点に休み、安価な装置を
提供すること、更に装置の小型化を図ることを目的とす
る。OBJECTS OF THE INVENTION The present invention addresses these conventional problems and aims to provide an inexpensive device and further downsize the device.

発明の概要 本発明は光学記録媒体の信号面の所定方向での傾きを検
出するスキュー検出装置において、光源と前記光学記録
媒体の信号面との間に介挿された光ディテクタを備え、
この光ディテクタは、前記光源からの入射光束の少なく
とも一部を透過させて前記光学記録媒体の信号面へ入射
させかつその光学記録媒体の信号面から反射された戻り
光束を受光する一対の受つ“Ｃ領域を有し、前記一対の
受ブＣて 領域は前記戻り光束を前記所定方向に２分するように構
成され、両受光領域の出力差により前記光学記録媒体の
信号面の傾きを検出するようにしたものである。従って
このように構成したことにより、高ｆｌｉ　ｒＪ：ビー
ムスプリッタを不敬にし、従来に比べ部品点数を少なく
すると共に組立工数を減らずことができ、装Ｆｉ：を安
価にかつ小型にすることができる。Summary of the Invention The present invention provides a skew detection device for detecting the inclination of a signal surface of an optical recording medium in a predetermined direction, comprising an optical detector interposed between a light source and the signal surface of the optical recording medium;
The optical detector includes a pair of receivers that transmit at least a portion of the incident light beam from the light source to be incident on the signal surface of the optical recording medium, and receive a return light beam reflected from the signal surface of the optical recording medium. The pair of receiving areas C are configured to divide the returned light beam into two in the predetermined direction, and the inclination of the signal surface of the optical recording medium is detected based on the output difference between the two receiving areas. Therefore, by configuring it in this way, it is possible to eliminate the need for a high-fli rJ beam splitter, reduce the number of parts compared to the conventional method, and do not reduce the number of assembly steps, making the installation inexpensive. It can be made smaller and more compact.

実施例 本発明によるスキュー検出装置の一実施例につき、第６
図１〜第６図を用いて以下説明する。Embodiment The sixth embodiment of the skew detection device according to the present invention
This will be explained below using FIGS. 1 to 6.

なお、光学式のビデオディスクやコンパクトテイスクな
どの光学記録媒体の一例である光ディスクにス；１−ニ
ーがない場合とある：ｌｊ’３合の光学系の全付図を夫
々第６図、第５図に示す。Note that there are cases where an optical disc, which is an example of an optical recording medium such as an optical video disc or a compact disc, does not have a knee. It is shown in Figure 5.

発光タイオード（ＬＥＤ）や半導体レーザなどの点光源
（図示は半導体レーザ）（ＬＤ）から出射された光束は
、コリメークレンズ（ＣＯＬ）によって平行光束にされ
た後、透明もしくは半透明の光ディテクタ（ＨＤ）を透
過して光ディスク（Ｄ）の信号面に垂直状に入射される
。そして光ディスクＣＤ）の信号面にスキューがない場
合には、戻り光束はもとの入射光用１と平行に戻る（第
６図）。しかし、光ディスク（１））の信号面にスキュ
ーがあると、光ディスク（Ｄ）の信号面と入射光４］１
１が垂直でなくなり、戻り光束は第５図に示すように入
射光軸と平行に戻らない。A light beam emitted from a point light source (LD) such as a light emitting diode (LED) or a semiconductor laser (a semiconductor laser is shown) is collimated by a collimating lens (COL), and then passed through a transparent or translucent light detector ( The light passes through the optical disk (HD) and is incident perpendicularly onto the signal surface of the optical disk (D). If there is no skew in the signal plane of the optical disc (CD), the returned light beam returns parallel to the original incident light beam 1 (FIG. 6). However, if there is a skew in the signal surface of the optical disk (1)), the signal surface of the optical disk (D) and the incident light 4]1
1 is no longer perpendicular, and the returned light beam does not return parallel to the incident optical axis as shown in FIG.

ところで透明もしくは半透明の光ディテクタ（）］、Ｄ
）は点光源（ｉ、Ｄ）と光ディスクＣＤ）の信号面間に
介挿されればよく、従って図示とは異なり点光源（ＬＤ
）とコリメータレンズ（ＣＯＬ）間に介挿してもよい。By the way, a transparent or semi-transparent light detector ()], D
) need only be inserted between the point light source (i, D) and the signal surface of the optical disc CD). Therefore, unlike the illustration, the point light source (LD
) and a collimator lens (COL).

そしてこの透明もしくは半透明の光ディテクタ（１１Ｄ
　）としては、比較的安価な（ローコストの〕シリコン
太陽電池、アモルファス太陽電池などが使用される。ア
モルファス太陽電池としては、例えはアモルファス・シ
リコン太陽電池などが挙げられる。And this transparent or semi-transparent light detector (11D
), relatively inexpensive (low-cost) silicon solar cells, amorphous solar cells, etc. are used. Examples of the amorphous solar cells include amorphous silicon solar cells.

光ディテクタ（）−（Ｄ）として使用される上記太陽電
池には、受光域Ａ−ＤｆＪＨＪ４図、第６図に示す如く
配置されており、各受光域Ａ、Ｄは受光量に対応した出
力を送出する出力端を有している。そして光ディスクＣ
Ｄ）のラジアル方向Ｘ及びこれと直角方向であるクンジ
エンシャル方向Ｙに対応シた投影されるラジアル方向Ｘ
′及びタンジエンシャル方向Ｙ′にて夫々２分されるよ
うに構成きれる受光領域（Ａ、Ｄ）と（Ｂ％Ｃ）、（Ａ
％Ｂ）と（Ｃ，Ｄ）の組が夫々ラジアルスキュー、クン
ジエンシャルスキュー検出のための一対の受光領域を成
している。ここで受光域Ａ、Ｄの各出力をＳＡ〜ＳＤと
すると、一対の受光領域（Ａ、Ｄ）と（Ｂ。The solar cells used as photodetectors ()-(D) are arranged as shown in Figures A-DfJHJ4 and Figure 6, and each of the light-receiving areas A and D has an output corresponding to the amount of light received. It has an output end for sending out data. and optical disc C
D) radial direction X that corresponds to the radial direction X and the Kunsential direction Y that is perpendicular to this
' and the tangential direction Y', the light receiving areas (A, D), (B%C), (A
The pairs of %B) and (C, D) form a pair of light receiving areas for detecting radial skew and Kunsential skew, respectively. Here, if the respective outputs of the light receiving areas A and D are SA to SD, then a pair of light receiving areas (A, D) and (B).

Ｃ）、（Ａ、Ｂ）と（Ｃ％Ｄ）の出力の差、即ち（ＳＡ
＋ｓｎ）　（８１１＋ＳＣ）、Ｃ８Ａ＋　ＳＢ）　−（
Ｓｃ−１−ＳＤ）　により夫々光ディスク（Ｄ）の信号
面のラジアル方向Ｘ及びクンジエンシャル方向Ｙでの傾
き（スキュー〕が検出される。C), the difference between the outputs of (A, B) and (C%D), i.e. (SA
+sn) (811+SC), C8A+ SB) -(
Sc-1-SD) detects the inclination (skew) of the signal surface of the optical disc (D) in the radial direction X and the dimensional direction Y, respectively.

しかして、光ディスク（Ｄ）の信号面がラジアル方向Ｘ
及びクンジエンシャル方向Ｙに対して傾きを有していな
いときは、第３図に示すように光ディスク（Ｄ）に垂直
に入射した平行光束は光デイスり（Ｄ）によって反射さ
れ、もとの光路を逆にたどって光ディテクタ（Ｉ−ＩＤ
）に入射される。従って光ディテクタ（）−１Ｄ）の受
光域Ａ、１）において、第４図に示す如く、コリメータ
レンズ（ＣＵＬ）を介して受光される点光源（ＬＤ）か
らの出射光束による投影像Ｐ　（Ｘ’力方向Ｙ′力方向
て夫々均等に２分きれるようになっているつと、光デ・
ｆスフ（Ｄ）から反射されてきた戻り光束による投影像
Ｑが中央に位置することになる。よって−刻の受光領域
（Ａ。Therefore, the signal surface of the optical disc (D) is in the radial direction
When there is no inclination with respect to the Kunsential direction Y, the parallel light beam incident perpendicularly on the optical disc (D) is reflected by the optical disc (D) and returns to its original state as shown in Figure 3. Follow the optical path in reverse and check the optical detector (I-ID).
). Therefore, in the light receiving area A,1) of the optical detector ()-1D), as shown in FIG. 4, a projected image P (X 'Force direction Y' Force direction is divided equally into two parts, and light de-
The projected image Q formed by the return light beam reflected from the f screen (D) will be located at the center. Therefore, the light receiving area (A.

」））と（Ｂ、Ｃ）の出力の差、即ち（ＳＡ＋８Ｄ）−
Ｃ８Ｂ＋５ｃ）＝０となり、ラジアルスキューは存在し
ないことになる。”)) and (B, C), i.e. (SA+8D)-
C8B+5c)=0, and there is no radial skew.

一方、光ディスク（Ｄ）の信号面が第５図に示すように
ラジアル方向Ｘに対しΔθ傾くと、戻り光束の光軸は入
射される光軸に対して２Δθ傾く。このため光ディテク
タ（ｌｉＤ）の一対の受光領域（Ａ。On the other hand, when the signal surface of the optical disk (D) is tilted by Δθ with respect to the radial direction X as shown in FIG. 5, the optical axis of the returned light beam is tilted by 2Δθ with respect to the incident optical axis. Therefore, a pair of light receiving areas (A) of the optical detector (liD).

Ｄ〕と（Ｂ、Ｃ）に投影される投影像Ｑの位置は第６図
に示す如（出射光束による投影像Ｐの位置に対しラジア
ル方向Ｘ′に変位することになる。よってこの一対の受
光領域（Ａ、、Ｄ）と（Ｂ％Ｃ）における受光量（出射
光束と戻り光束とによる受光量の和）が不平ゆｊとなり
、光ディテクタ（ＨＤ）より差出力、即ち（８ｈ＋ＳＤ
）　（８ｎ＋Ｓｃ）　（六〇）が得られ、この差出力に
より光ティスフ（Ｄ）の信号面のラジアル方向Ｘでの傾
き（ラジアルスキュー）が検出される。D] and (B, C) are displaced in the radial direction The amount of light received in the light receiving areas (A, , D) and (B%C) (the sum of the amount of light received by the emitted light flux and the returned light flux) becomes an imbalance, and the difference output from the optical detector (HD), that is, (8h + SD
) (8n+Sc) (60) is obtained, and the inclination (radial skew) of the signal surface of the optical tisf (D) in the radial direction X is detected by this differential output.

また光ティスフ（Ｊ））の信号面のクンジエンシャル方
向Ｙでの傾き（タンジエンシャルヌキュー〕の（食出に
ついても前述した吉同様である。ただしこの場合には、
一対の受ブＣ領域（Ａ％Ｂ）と（Ｃ。Also, the eclipse of the signal plane of the optical Tisph (J) in the Kunsential direction Y (Tangentials) is also the same as the above-mentioned Kichi. However, in this case,
A pair of receiving areas C (A%B) and (C.

■））に受光される出射光束と戻り光束との受光量にも
とづく出力によりタンジエンシャルスキューは（ＳＡ　
＋８ｎ）　（ＳＣ＋　ＳＤ）としてめられることはいう
までもないことである。更に光ディスク（Ｄ）の信号面
のラジアル方向Ｘ十５よびクンジエンシャル方向Ｙでの
傾き、即ちラジアルスキューおよびタンジエンシャルス
キューの検出についても前述したと同イ羊にしてめられ
る。■)) The tangential skew is determined by the output based on the amount of outgoing light flux and return light flux received by (SA).
+8n) (SC+SD). Furthermore, detection of the inclination of the signal surface of the optical disc (D) in the radial direction

以上のようにして、ラジアルスキューやクンジエンシャ
ルスキューが検出されると、このスキュー月：にもとづ
きスキューサーボ機措を制御することにより、正確な光
ピツクアップ動作をさせることができる。As described above, when radial skew or Kunsential skew is detected, accurate optical pickup operation can be performed by controlling the skew servo mechanism based on this skew.

なお本実施例においては、光ディスク（１））への入射
光束を平行光束吉した場合について言及したけれども、
本発明はこれに限定されることな（、例えば、第６図（
第５図）において透明もしくは半透明の光ディテクタ（
ＨＤ）と光ディスクＣＤ）間に対物レンズを介挿させて
スポット状の収束光束として光ディスク（Ｄ）に入射さ
せてもよいし、また光ディスク（１））に発散光束とし
て入射させるようにしてもよい。Although in this embodiment, the case where the light beam incident on the optical disk (1) is parallel light beam has been mentioned,
The present invention is not limited to this (for example, Fig. 6 (
A transparent or translucent light detector (Fig. 5)
An objective lens may be inserted between the optical disc (HD) and the optical disc CD), and the light may be incident on the optical disc (D) as a spot-like converging light beam, or it may be made to be incident on the optical disc (1)) as a diverging light flux. .

発け１」の効果 本発明は上述の如く、点光源と光学記録媒体の＠力面間
に、その点光源からの入射光束の少なくとも一部を透過
させて前記光学記録媒体へ入射きぜると共にその光学記
録媒体から反射された戻り光束に対して、その戻り光束
を所定方向にて２分するように構成された一対の受光領
域を有する光ディテクタを介挿し、高価なビームスプリ
ッタをすると共に組立工数を減らすことができ、装置を
安価にがつ小型にすることができる。As described above, the present invention transmits at least a part of the incident light beam from the point light source between the @force surface of the point light source and the optical recording medium, and causes the light beam to enter the optical recording medium. At the same time, an optical detector having a pair of light-receiving areas configured to split the returned light beam into two in a predetermined direction is inserted into the return light beam reflected from the optical recording medium, and an expensive beam splitter is used. The number of assembly steps can be reduced, and the device can be made smaller and cheaper.

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

第１図は従来のスキュー検出装置の一例を示す光学系の
全体図、第２図は第１図の差動光検出器（■−）Ｔｏ〕
の受光部分の説明図である。 第６図および第５図は本発明によるスキュー検出装置の
一実施例を示す光学系の全体図であって、第６図はスキ
ューがない場合、第５図はスキューのあるｗ合を示して
いる。第４図および第６図は夫々第６０および′第５図
の透明もしくは半透明の光ディテクタ（Ｔ−１１１）に
おける受ブ１一部分の６１？明図である。 なお図面に用いられている符号において、（：ｒ、ｉ）
、）・・・・・・・・・点光源（ＩＩＤ）・・・・・・
・・・透明もしく？Ｊ＃透明のブｒ；デイブクタ（Ｄ）
・・・・・・・・・光デ・イスクである。 第１図 Ｘ、） 第２図 第３図 第４図Figure 1 is an overall diagram of an optical system showing an example of a conventional skew detection device, and Figure 2 is the differential photodetector (■-)To of Figure 1.
FIG. 2 is an explanatory diagram of a light receiving portion of 6 and 5 are overall diagrams of an optical system showing an embodiment of the skew detection device according to the present invention, in which FIG. 6 shows a case where there is no skew, and FIG. 5 shows a case where there is a skew. There is. 4 and 6 respectively show 60 and '61' of a portion of the receiver 1 in the transparent or translucent optical detector (T-111) of FIG. 5. This is a clear diagram. In addition, in the symbols used in the drawings, (:r, i)
, )・・・・・・Point light source (IID)・・・・・・
...Is it transparent? J# Transparent blue r; Day Kuta (D)
・・・・・・・・・This is Hikaru de Isk. Figure 1 X, ) Figure 2 Figure 3 Figure 4

Claims (1)

【特許請求の範囲】[Claims] 光学記録媒体の信号面の所定方向での傾きを検出するス
キュー検出装置において、光源と前記光学記録媒体の信
号面との間に介挿きれた光ディテクタを備え、この光デ
ィテクタは、前記光源からの入射光束の少なくとも一部
を透過させて前記光学記録媒体の信号面へ入射させかつ
その光学記録媒体の信号面から反射された戻り光束を受
光する一対の受光領域を有し、前記一対の受光領域は前
記戻り光束を前記所定方向にて２分するように構成され
、両受光領域の出力差により前記光学記録媒体の信号面
の傾きを検出するようにしたことを特徴とするスキュー
検出装置。A skew detection device for detecting the inclination of a signal surface of an optical recording medium in a predetermined direction includes an optical detector interposed between a light source and the signal surface of the optical recording medium, and the optical detector a pair of light-receiving areas for transmitting at least a part of an incident light beam to be incident on the signal surface of the optical recording medium and receiving a return light beam reflected from the signal surface of the optical recording medium; The skew detection device is characterized in that the area is configured to divide the returned light beam into two in the predetermined direction, and the inclination of the signal surface of the optical recording medium is detected based on the output difference between the two light receiving areas.
JP14225083A 1983-08-03 1983-08-03 Skew detector Pending JPS6035343A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP14225083A JPS6035343A (en) 1983-08-03 1983-08-03 Skew detector

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP14225083A JPS6035343A (en) 1983-08-03 1983-08-03 Skew detector

Publications (1)

Publication Number Publication Date
JPS6035343A true JPS6035343A (en) 1985-02-23

Family

ID=15310937

Family Applications (1)

Application Number Title Priority Date Filing Date
JP14225083A Pending JPS6035343A (en) 1983-08-03 1983-08-03 Skew detector

Country Status (1)

Country Link
JP (1) JPS6035343A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0369026A (en) * 1989-08-05 1991-03-25 Mitsubishi Electric Corp Device for detecting inclination of recording medium and device for adjusting position of optical head by using this device

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0369026A (en) * 1989-08-05 1991-03-25 Mitsubishi Electric Corp Device for detecting inclination of recording medium and device for adjusting position of optical head by using this device

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