JPH0247508A - Detector of inclination of disk-shaped recording medium - Google Patents
Detector of inclination of disk-shaped recording mediumInfo
- Publication number
- JPH0247508A JPH0247508A JP19814388A JP19814388A JPH0247508A JP H0247508 A JPH0247508 A JP H0247508A JP 19814388 A JP19814388 A JP 19814388A JP 19814388 A JP19814388 A JP 19814388A JP H0247508 A JPH0247508 A JP H0247508A
- Authority
- JP
- Japan
- Prior art keywords
- light
- lens
- recording medium
- disc
- shaped 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.)
- Granted
Links
- 238000001514 detection method Methods 0.000 claims abstract description 33
- 230000003287 optical effect Effects 0.000 claims description 23
- 238000000034 method Methods 0.000 abstract description 9
- 238000000465 moulding Methods 0.000 abstract description 3
- 238000010586 diagram Methods 0.000 description 11
- 230000004907 flux Effects 0.000 description 6
- 239000000463 material Substances 0.000 description 5
- 238000004519 manufacturing process Methods 0.000 description 3
- 239000011347 resin Substances 0.000 description 3
- 229920005989 resin Polymers 0.000 description 3
- 230000015572 biosynthetic process Effects 0.000 description 2
- 238000007665 sagging Methods 0.000 description 2
- 238000004364 calculation method Methods 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 230000008094 contradictory effect Effects 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000035945 sensitivity Effects 0.000 description 1
Landscapes
- Length Measuring Devices By Optical Means (AREA)
Abstract
Description
【発明の詳細な説明】
〔産業上の利用分野〕
本発明は、レーザディスク等の光学式円盤状記録媒体（
以下、単に光ディスクという。）の傾き検出器に関する
。[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to optical disc-shaped recording media (such as laser discs).
Hereinafter, it will simply be referred to as an optical disc. ) regarding the tilt detector.
近年では、記録面に高密度で記録された画像情報や音楽
情報等をレーザビームにより非接触で読取り可能とした
レーザディスク等の光ディスクが背反している。In recent years, optical discs such as laser discs, which allow image information, music information, etc. recorded at high density on a recording surface to be read without contact with a laser beam, have become contradictory.
かかるディスクの再生装置において、ディスクは高速で
回転するターンテーブル上に載置されて回転駆動される
。ターンテーブルは高速回転させられるため、始動時、
停止時に生じる慣性の影響を極力小さくする必要がある
。そのため、ターンテーブルはディスクの直径に比べて
かなり小さな直径で形成されている。その結果、ターン
テーブル上に載置されたディスクの外周端にはその内周
端に比べて垂れ下がりが生じる。この垂れ下がりによっ
てディスクの記録面が傾斜する。この現象は特に大径の
レーザディスクにおいて生じ易い。In such a disc playback device, the disc is placed on a turntable that rotates at high speed and is driven to rotate. Since the turntable is rotated at high speed, when starting,
It is necessary to minimize the influence of inertia that occurs when stopping. Therefore, the turntable is formed with a diameter that is considerably smaller than the diameter of the disk. As a result, the outer circumferential edge of the disk placed on the turntable sag compared to its inner circumferential edge. This sagging causes the recording surface of the disk to be tilted. This phenomenon is particularly likely to occur in large-diameter laser disks.
記録面の傾斜は、光ピツクアップからの読み取りビーム
の光軸と記録面との直交関係のずれを生ぜしぬる。この
ことは、読み取りビームのピット位置への正確な照射を
誤らせ、焦点ずれ等に基づく再生信号の品質の低下を招
来する。The inclination of the recording surface causes a deviation from the perpendicular relationship between the optical axis of the read beam from the optical pickup and the recording surface. This causes errors in accurate irradiation of the reading beam to the pit position, leading to deterioration in the quality of the reproduced signal due to defocus and the like.
そこで、従来では、ディスクの垂れ下がり、すなわち記
録面の傾斜に応じて読み取りビームの光軸を記録面に対
して常に垂直関係を保つよう補正する装置が提案されて
いる（実開昭５９−１６８８３５号公報）。Therefore, conventionally, a device has been proposed that corrects the optical axis of the reading beam so that it always maintains a perpendicular relationship to the recording surface according to the sagging of the disk, that is, the inclination of the recording surface (Utility Model Application No. 59-168835). Public bulletin).
この従来装置は、傾き検出器により記録面の傾き度合を
検出し、その検出信号により光ピツクアップの傾きを記
録面の傾きに応じて追従補正するものである。この従来
装置によれば、傾き補正により読み収りビームの光軸を
正しい位置に補正できるため、正確な情報読み出しが可
能であるという点で優れたものである。しかし、傾き検
出器は、発光素子を間にしてその両側にディスク半径方
向に配置された２つの受光素子で形成されるなめ、検出
器の大型化が問題となる。高密度で各種部品が実装され
た再生装置内部はスペース的に制約があり、傾き検出器
の小型化は一つの課題である。This conventional device uses a tilt detector to detect the degree of inclination of the recording surface, and uses the detection signal to correct the inclination of the optical pickup according to the inclination of the recording surface. This conventional device is excellent in that accurate information reading is possible because the optical axis of the reading beam can be corrected to the correct position by tilt correction. However, since the tilt detector is formed of two light receiving elements arranged in the radial direction of the disk on both sides with a light emitting element in between, increasing the size of the detector becomes a problem. Space is limited inside the playback device, where various components are mounted at high density, and one challenge is to miniaturize the tilt detector.
かかる課題を解決しうるちのとして、筒状のハウジング
部材内に検出光収束用のレンズと発光素子および受光素
子を封入して構成されたものが知られている（特開昭６
０−３２１４２号公報）。As a solution to this problem, there is a known structure in which a lens for converging detection light, a light emitting element, and a light receiving element are enclosed in a cylindrical housing member (Japanese Patent Laid-Open No. 6
0-32142).
この検出器の概略を第１３図に示す。A schematic diagram of this detector is shown in FIG.
第１３図において、筒状ハウジング部材５の記録面３１
１！ＩＩにレンズ２が嵌め込まれ、反対の底側に拡散光
源１と２分割受光素子４が配置されている。In FIG. 13, the recording surface 31 of the cylindrical housing member 5
1! A lens 2 is fitted into II, and a diffused light source 1 and a two-split light receiving element 4 are arranged on the opposite bottom side.
上記第１３図に示した傾き検出器の問題点は筒状ハウジ
ング部材５とレンズ２とが別体であり、両者を一体化す
るための組立工程を必要とするという点にある。The problem with the tilt detector shown in FIG. 13 is that the cylindrical housing member 5 and the lens 2 are separate bodies, and an assembly process is required to integrate them.
というのは、２点の部品を事後的に組立る場合に両者の
組立精度が問題となり、またその分だけ生産工程数が増
えることになるからである。特に、精密検出を必要とす
る傾き検出器にあって異なる部品を組立てることは製品
の歩溜りに影響を与え、かつ慎重な組立作業を必要とす
ることから作業効率も良くない。This is because when assembling two parts after the fact, the accuracy of assembling them becomes a problem, and the number of production steps increases accordingly. In particular, assembling different parts of a tilt detector that requires precise detection affects product yield and requires careful assembly work, which is not good for work efficiency.
そこで、本発明は組立て工程の簡略化と検出精度の向上
を図りうる円盤状記録媒体の傾き検出器を提供すること
を目的とする。SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide a tilt detector for a disk-shaped recording medium that can simplify the assembly process and improve detection accuracy.
上記課題を解決するために、請求項１記載の発明は、円
盤状記録媒体の記録面に対面してレンズが設けられた筒
状外囲部材内に、前記レンズを介して前記記録面に検出
光を投光する発光素子と、前記検出光の前記記録面にお
ける反射光を前記レンズを介して受光し前記記録面の傾
きに応じた光量に対応する検出信号を出力する受光素子
と、が格納されてなる円盤状記録媒体の傾き検出器にお
いて、前記レンズと外囲部とを一体に成形したことを特
徴とする
請求項２記載の発明は、請求項１記載の円盤状記録媒体
の傾き検出器において、前記レンズは各レンズ中心を通
る光軸が平行になるよう配置された２個一対のレンズ部
で構成され、前記発光素子および受光素子はその相対間
隔が前記光軸の相対間隔より広くなる位置に配置されて
いることを特徴とする
請求項３記載の発明は、請求項１記載の円盤状記録媒体
の傾き検出器において、前記受光素子は円盤状記録媒体
の半径方向に２分割された領域と前記円盤状記録媒体の
接線方向に２分割された領域とが隣接して配置されてな
ることを特徴とする特〔作用〕
請求項１記載の発明によれば、レンズと外囲部とを一体
に形成したため、レンズと外囲部との物理的寸法関係は
一体形成時に定まり、組立１稈を必要としないので組立
て工程の簡略化とともに、組立誤差の発生を抑制するこ
とができ、組立誤差による検出精度の低下を防止できる
。In order to solve the above-mentioned problem, the invention according to claim 1 provides a method for detecting information on the recording surface through the lens in a cylindrical outer member provided with a lens facing the recording surface of the disc-shaped recording medium. A light emitting element that emits light and a light receiving element that receives reflected light of the detection light on the recording surface through the lens and outputs a detection signal corresponding to the amount of light according to the inclination of the recording surface. The invention as set forth in claim 2 is characterized in that the lens and the outer envelope are integrally molded in the tilt detector for a disc-shaped recording medium, which is a disc-shaped recording medium tilt detector according to claim 1. In the device, the lens is composed of a pair of lens parts arranged so that the optical axes passing through the center of each lens are parallel, and the relative distance between the light emitting element and the light receiving element is wider than the relative distance between the optical axes. The invention according to claim 3 is characterized in that in the tilt detector for a disc-shaped recording medium according to claim 1, the light receiving element is divided into two in the radial direction of the disc-shaped recording medium. According to the invention as set forth in claim 1, the lens and the outer surrounding portion are arranged adjacent to each other. Because they are integrally formed, the physical dimensional relationship between the lens and the outer envelope is determined at the time of integral formation, and one assembly is not required, which simplifies the assembly process and suppresses the occurrence of assembly errors. It is possible to prevent a decrease in detection accuracy due to assembly errors.
請求項２記載の発明によれば、２個一対のレンズ部と外
囲部とを一体形成し、発光素子と受光素子との相対間隔
を各レンズ部の光軸の相対間隔より広くしたため、特に
、記録面での反射光の受光範囲を拡大させることができ
る。それによって検出器と記録面との相対間隔を縮少化
でき、その寸法分だけ装置の小型化が可能であり、また
、同じ間隔ならば検出器自体を小型化しうる６また、受
光範囲の拡大化は検出精度にそれほどの高精度が必要な
くなり、製作が容易となる。According to the invention as claimed in claim 2, the pair of lens parts and the outer envelope are integrally formed, and the relative distance between the light emitting element and the light receiving element is made wider than the relative distance between the optical axes of each lens part. , it is possible to expand the receiving range of reflected light on the recording surface. As a result, the relative spacing between the detector and the recording surface can be reduced, and the device can be made smaller by that size.Also, if the spacing remains the same, the detector itself can be made smaller6.Also, the light receiving range can be expanded. This eliminates the need for such high detection accuracy and makes manufacturing easier.
また、請求項３記載の発明によれば、受光素子を４分割
としたため、記録面の半径方向の傾斜のみならず、接線
方向の傾斜をも検出でき、検出精度の向上が可能となる
。Further, according to the third aspect of the invention, since the light receiving element is divided into four parts, it is possible to detect not only the radial inclination of the recording surface but also the tangential inclination, and it is possible to improve the detection accuracy.
次に、本発明の実施例を図面に基づいて説明する。 Next, embodiments of the present invention will be described based on the drawings.
匪」」ｐ１泗 第１図〜第３図に本発明の第１実施例を示す。``匪'' p1泗 A first embodiment of the present invention is shown in FIGS. 1-3.
この第１実施例は、傾き検出器のレンズと外囲部とを予
め一体形成した点に特徴を有する。This first embodiment is characterized in that the lens of the tilt detector and the outer envelope are integrally formed in advance.
第１図に示すように、外囲部６の記録面７側に面してレ
ンズ部８が形成されている。この一体成形に当っては、
同一の透明樹脂材料によるモールド成形とする。なお、
外乱的光線の内部への侵入を防止し、ノイズを抑制する
ために、外囲部６のみを不透明とする楕成にしてもよい
。その場合には、同じ樹脂材料に遮光用の染料を混入す
るか、異なる樹脂材料を２段で用いてもよい、その場合
には、互に相溶性を有する材料を選択すべきである。異
なる材料を用いて外囲部６とレンズ部８を複合化する場
合には、それらの界面の強度、固着性が必要となるから
である。As shown in FIG. 1, a lens portion 8 is formed facing the recording surface 7 side of the outer surrounding portion 6. In this integral molding,
Mold made from the same transparent resin material. In addition,
In order to prevent disturbing light from entering the interior and to suppress noise, an elliptical shape may be used in which only the outer envelope 6 is opaque. In that case, a light-shielding dye may be mixed into the same resin material, or different resin materials may be used in two stages. In that case, materials that are compatible with each other should be selected. This is because when the outer envelope part 6 and the lens part 8 are made into a composite material using different materials, the strength and adhesion of the interface between them are required.
以上の一体成形された外囲部６内には検出光Ａを投光す
るＬＥＤＩの発光索子９と、その反射光Ｂを受光するフ
ォトトランジスタ等の受光素子１０とがディスクの直線
方向ｔに互に所定の相対間隔ｄ１を置いて配置されてい
る。これらの発光素子９と受光索子１０は同〜の焦点面
１６上にある。Inside the integrally formed outer enclosure 6, a light emitting element 9 of an LED that emits the detection light A and a light receiving element 10 such as a phototransistor that receives the reflected light B are arranged in the linear direction t of the disk. They are arranged at a predetermined relative interval d1 from each other. The light emitting element 9 and the light receiving element 10 are on the same focal plane 16.
受光素子１０はディスクの半径方向ｒに２分割された２
つの受光領域ＬＯａ、１０ｂを有しており、その境界線
１を中心として、第３図（ｂ）に示すように反射ビーム
が適当なスポット面積で結像されるよう配置されている
。なお、受光領域１０ａ、１０ｂの各光電変換出力信号
は、図示しない比較演算器によりその差分が演算され、
傾き方向と傾き量が求められる。The light receiving element 10 is divided into two parts in the radial direction r of the disk.
It has two light-receiving areas LOa and 10b, which are arranged so that the reflected beam is imaged with a suitable spot area, as shown in FIG. 3(b), with the boundary line 1 as the center. Note that the difference between the photoelectric conversion output signals of the light receiving areas 10a and 10b is calculated by a comparator (not shown).
The direction and amount of tilt are determined.
以上の構成において、ディスクＤの傾斜がない場合には
記録面７からの反射ビームスポット１１は境界線１を中
心に受光領域１０ａ、１０ｂの双方に均等に跨って結像
する（第３図（ｂ））。よって、受光領域１０ａ、１０
ｂの差電圧はゼロであり、傾斜が生じていないことを検
出できる。In the above configuration, when there is no inclination of the disk D, the reflected beam spot 11 from the recording surface 7 forms an image equally spanning both the light receiving areas 10a and 10b centering on the boundary line 1 (see FIG. 3). b)). Therefore, the light receiving areas 10a, 10
The differential voltage of b is zero, and it can be detected that no slope occurs.
光ピツクアップがディスクＤの外周側に移動するに従っ
て、ディスクＤには垂れ下がりが生じているので記録面
７は傾斜している。この場合、反射ビームスポット１１
は境界線１より受光領域１０ｂ側に変位して結像する（
第３図（Ｃ））。As the optical pickup moves toward the outer circumference of the disk D, the disk D begins to sag, so that the recording surface 7 is inclined. In this case, the reflected beam spot 11
is shifted toward the light-receiving area 10b side from the boundary line 1 and is imaged (
Figure 3 (C)).
よって、受光領域１０ａと受光領域１０ｂとの間には差
電圧が生じ、傾斜を検出できる。Therefore, a voltage difference is generated between the light receiving area 10a and the light receiving area 10b, and a tilt can be detected.
また、これとは逆に、ディスクＤに上向きのそりが生じ
ている場合（ディスク自体の変形等による）、上記第３
図（Ｃ）とは逆に反射ビームスボンド１１は受光領域１
０ａ側に変位して結ｆ象する（第３図（ａ））よって、
この場合も同様に差電圧により傾斜を検出できる。Conversely, if the disk D is warped upward (due to deformation of the disk itself, etc.), the third
Contrary to the diagram (C), the reflected beam bond 11 is the light receiving area 1.
It is displaced to the 0a side and forms an f image (Fig. 3 (a)). Therefore,
In this case as well, the slope can be detected using the differential voltage.
乳斐犬呈」
次に、第４図〜第８図に本発明の第２実施例を示す。な
お、第１実施例と同一もしくは重複する部分には同一の
符号を附して説明する。Next, a second embodiment of the present invention is shown in FIGS. 4 to 8. Note that the same reference numerals are given to the same or overlapping parts as those in the first embodiment in the description.
本実施例は、第１実施例を基本としてその改良を図った
ものである。すなわち、第４（ｂ）図に示すように、第
１実施例によれば次の点が問題となる。レンズ部８を経
てディスクＤに向う検出光Ａの光束を平行光束とするた
めに発光素子９はレンズ部８の焦点面１６上に置かれる
。レンズ部８の屈折率を１．５とすると、レンズ部８の
曲率半径Ｒとレンズ部８の焦点圧Ｍｆ′との関係は、お
よそ
Ｒ＝ｆ′ ／３ ・・・ （１）となる。第４図
（ａ）発光素子９を出て記録面７から戻る反射光Ｂの光
束のうち、有効光束はθの範囲のみであり、池はレンズ
部８の内面で全反射するか、レンズ部８を経て記録面７
で反射した後、レンズ部８に戻らない光となる。このよ
うに、有効光束がθの範囲に制約され、受光領域１０ａ
１０ｂから十分な検出信号を得ることができない場合が
生じる。This embodiment is based on the first embodiment and is an improvement thereof. That is, as shown in FIG. 4(b), the following problems arise according to the first embodiment. The light emitting element 9 is placed on the focal plane 16 of the lens section 8 in order to convert the luminous flux of the detection light A toward the disk D via the lens section 8 into a parallel luminous flux. Assuming that the refractive index of the lens portion 8 is 1.5, the relationship between the radius of curvature R of the lens portion 8 and the focal pressure Mf' of the lens portion 8 is approximately R=f'/3 (1). FIG. 4(a) Of the reflected light B that exits the light emitting element 9 and returns from the recording surface 7, the effective light flux is only in the range θ, and the pond is either totally reflected on the inner surface of the lens portion 8 or Recording surface 7 after 8
The light does not return to the lens section 8 after being reflected. In this way, the effective luminous flux is restricted to the range of θ, and the light receiving area 10a
There may be cases where a sufficient detection signal cannot be obtained from the sensor 10b.
また、第４図（ｂ）に示すように、再生装置全体の小型
化を図る上で検出器を相似的に小さくできれば性能的に
変らないものが得られる。しかし、発光素子つと受光素
子１０とは外囲部６内に収納されるため、発光素子つと
受光素子１０との相対間隔ｄはある大きさ以上に狭める
ことが困難であり、小型化に限界が生じる。Further, as shown in FIG. 4(b), if the size of the detector can be made similar to the size of the entire reproducing apparatus, the same performance can be obtained. However, since the light-emitting element and the light-receiving element 10 are housed within the outer enclosure 6, it is difficult to reduce the relative distance d between the light-emitting element and the light-receiving element 10 beyond a certain value, which limits miniaturization. arise.
また、第４図（ｂ）に示すように、光ディスクの再生装
置におけるディスクＤの傾き検出においては、ディスク
Ｄの面ぶれ等を考慮すると検出器とディスクＤの間隔は
所定の間隔Ｈに保つ必要があるが、この時装置だけを小
型化するにあたっても発光素子９と受光素子１０の間隔
ｄを保つと、発光素子９からの光が受光素子１０に戻ら
ず検出機能を果たさない。In addition, as shown in FIG. 4(b), when detecting the inclination of the disc D in an optical disc playback device, the distance between the detector and the disc D must be maintained at a predetermined distance H in consideration of surface wobbling of the disc D, etc. However, if the distance d between the light emitting element 9 and the light receiving element 10 is maintained even when downsizing only the device, the light from the light emitting element 9 will not return to the light receiving element 10 and the detection function will not be fulfilled.
また、第５図に示すように、ディスクの傾き検出方向と
垂直な方向に傾き誤差θ１があるとき、発光素子９より
の光束θのうち、受光素子１０にほとんど戻らないこと
もあり、ディスクＤ ６１きの検出信号が得られないこ
とになる。Further, as shown in FIG. 5, when there is a tilt error θ1 in a direction perpendicular to the disc tilt detection direction, very little of the light flux θ from the light emitting element 9 may return to the light receiving element 10, and the disc D 61 detection signals cannot be obtained.
以上の点に鑑み、本実施例は２個一対のレンズ部と外囲
部とを一体に形成するとともに、発光素子９と受光素子
１０との相対間隔を各レンズ部の光軸の相対間隔より広
くして配置した点に特徴を有する。In view of the above points, in this embodiment, two pairs of lens parts and an outer enclosure part are integrally formed, and the relative distance between the light emitting element 9 and the light receiving element 10 is set from the relative distance between the optical axes of each lens part. It is characterized by its wide layout.
第６図に示すように、外囲部６の記録面７側に面して第
ルンズ部１２および第２レンズ部１３が形成されている
。第ルンズ部１２と第２レンズ部１３とは同一の曲率半
径を有し、そのレンズ中心を通る光軸１４，１５は互に
所定間隔ｄ２を保持して平行になるよう配置されている
。この第ルンズ部１２、第２レンズ部１３と外囲部６の
一体形成方法は第１実施例と同様である。As shown in FIG. 6, a first lens section 12 and a second lens section 13 are formed facing the recording surface 7 side of the outer envelope section 6. The first lens part 12 and the second lens part 13 have the same radius of curvature, and are arranged so that optical axes 14 and 15 passing through the centers of the lenses are parallel to each other with a predetermined distance d2 between them. The method of integrally forming the first lens part 12, the second lens part 13, and the outer enclosure part 6 is the same as in the first embodiment.
第７図に示すように、以上の一体成形された外囲部６内
には、発光素子９と受光素子１０とが直線方向ｔに互に
相対間隔ｄ１を置いて配置されている。これらの発光素
子９と受光素子１０はほぼ同一の焦点面１６上にある。As shown in FIG. 7, a light emitting element 9 and a light receiving element 10 are arranged in the integrally formed outer enclosure 6 with a relative distance d1 from each other in the linear direction t. These light emitting element 9 and light receiving element 10 are located on substantially the same focal plane 16.
相対間隔ｄ１は間隔ｄ２よりも大きくなるよう発光素子
つと受光素子１０とが配置されている。The light emitting element and the light receiving element 10 are arranged so that the relative interval d1 is larger than the interval d2.
受光素子１０の受光領域１０ａと受光領域１０ｂの配列
状態は第１実施例と同様である。The arrangement of the light receiving area 10a and the light receiving area 10b of the light receiving element 10 is the same as in the first embodiment.
以上の構成において、発光素子９から出た検出光Ａは第
ルンズ部１２を介して記録面７で反射し、今度は第２レ
ンズ部１３を介して受光素子１０に入射される。このと
き、相対間隔ｄ１は間隔ｄ２より大きく（ｄｌ〉ｄ２）
設定されているため、第２レンズ部１３を介して入射さ
れる反射光Ｂを確実に受光素子１０に結像させることが
できる。このとき、検出可能範囲は第６図、第８図上の
θ１で与えられる。In the above configuration, the detection light A emitted from the light emitting element 9 is reflected by the recording surface 7 via the first lens section 12, and then enters the light receiving element 10 via the second lens section 13. At this time, the relative interval d1 is larger than the interval d2 (dl>d2)
Because of this setting, the reflected light B incident through the second lens section 13 can be reliably focused on the light receiving element 10. At this time, the detectable range is given by θ1 on FIGS. 6 and 8.
このようにして、第１実施例より広範囲で検出でき、記
録面７の傾きと反射ビームスポット１１との関係は第１
実施の場合と同様であり、各態様を第９図（ａ）（ｂ）
（ｃ）に示す。In this way, detection can be made over a wider range than in the first embodiment, and the relationship between the inclination of the recording surface 7 and the reflected beam spot 11 is the same as that in the first embodiment.
It is the same as in the case of implementation, and each aspect is shown in FIGS. 9(a) and (b).
Shown in (c).
第１０図は、検出器の高さｈを第６図に示す場合よりも
小さくしたものであり、第ルンズ部１２、第２レンズ部
１３を備え、かつ、相対間隔ｄ１を広くとれる分だけ集
光能力を向上しうるので、検ｔＢ器自体の小型化が可能
である。In FIG. 10, the height h of the detector is smaller than that shown in FIG. Since the optical capability can be improved, the size of the TB detector itself can be reduced.
１１里１週 次に、第１１図に本発明の第３実施例を示す。11ri 1 week Next, FIG. 11 shows a third embodiment of the present invention.
この実施例は、受光素子１０を上記各実施例のように２
分割したものではなく、ディスクＤの半径方向ｒに２つ
の受光領域１０ａ、１０ｂを配置し、これに隣接させて
接線方向ｔに２つの受光領域１０ｃ、１０ｄを配列させ
、受光素子１０を全部で４分割に構成したものである。In this embodiment, the light receiving element 10 is divided into two parts as in each of the above embodiments.
Rather than dividing the disc D, two light receiving areas 10a and 10b are arranged in the radial direction r of the disk D, and two light receiving areas 10c and 10d are arranged adjacent to this in the tangential direction t, so that the light receiving element 10 is It is structured into four parts.
このように、受光領域１０ｃ、１０ｄを設けることによ
り、記録面７の半径方向ｒのみならず接線方向しの傾き
をも同時に検出することができ、また検出範囲の拡大と
ともにより詳細な検出信号が得られるので細かな傾き補
正を行うことを可能とする。By providing the light-receiving areas 10c and 10d, it is possible to detect not only the radial direction r but also the tangential inclination of the recording surface 7 at the same time, and as the detection range is expanded, more detailed detection signals can be obtained. This makes it possible to perform fine tilt correction.
この実施例において、記録面７の半径方向ｒの傾きＳ、
は、
Ｓ ＝（ａ＋ｃ） （ｂ十ｄ） −（２）「
の演算を行うことにより求められる。ここに、ａｂ、ｃ
、ｄは受光領域１０ａ、１０ｂ、１０ｃ１０ｄの各検出
信号の値である。また、接線方向ｔの傾斜きＳｔは、
Ｓ ＝ （ａ＋ｂ）−（ｃ＋ｄ） −（３
）の演算を行うことにより求めることができる。したが
って、上記（２）、（３）式の演算器を構成すればよい
０図示は省略する。In this embodiment, the inclination S of the recording surface 7 in the radial direction r,
is obtained by performing the operation of S = (a + c) (b + d) - (2) ".Here, ab, c
, d are the values of the respective detection signals of the light receiving areas 10a, 10b, 10c10d. Also, the slope St in the tangential direction t is S = (a+b)-(c+d)-(3
) can be obtained by performing the calculation. Therefore, it is only necessary to configure the arithmetic units of formulas (2) and (3) above, and illustration thereof will be omitted.
又星」
以上の各実施例において、発光素子９はその発光面が記
録面７に対して平行（検出光軸は垂直）になるように配
置されているが、この配置によると十分な光量の検出光
が得られない場合がある。In each of the above embodiments, the light emitting element 9 is arranged so that its light emitting surface is parallel to the recording surface 7 (the detection optical axis is perpendicular). Detection light may not be obtained.
そこで、第１２図に示すように、発光素子９の発光面を
傾けて設置し、発光強度分布の最大値と発光素子９の中
心線を結ぶ光軸を利用可能光束範囲θ′の中心と一致さ
せることにより、十分な光量を得ることができ、検出の
確実性とともに検出感度を向上させることができる。Therefore, as shown in FIG. 12, the light-emitting surface of the light-emitting element 9 is tilted and the optical axis connecting the maximum value of the light-emitting intensity distribution and the center line of the light-emitting element 9 coincides with the center of the usable luminous flux range θ'. By doing so, a sufficient amount of light can be obtained, and detection reliability and detection sensitivity can be improved.
請求項１記載の発明によれば、レンズと外囲部とを一体
に形成したため、レンズと外囲部との物理的寸法関係は
一体形成時に定まり、組立工程を必要としないので組立
て工程の簡略化とともに、組立誤差の発生を抑制するこ
とができ、組立誤差による検出精度の低下を防止できる
。According to the invention described in claim 1, since the lens and the outer enclosure are integrally formed, the physical dimensional relationship between the lens and the outer enclosure is determined at the time of integral formation, and an assembly process is not required, which simplifies the assembly process. At the same time, it is possible to suppress the occurrence of assembly errors, and it is possible to prevent a decrease in detection accuracy due to assembly errors.
請求項２記載の発明によれば、２個一対のレンズ部と外
囲部とを一体形成し、発光素子と受光素子との相対間隔
を各レンズ部の光軸の相対間隔より大きくしたため、特
に、記録面での反射光の受光範囲を拡大させることがで
きる。それによって検出器と記録面との相対間隔を縮少
化でき、その寸法分だけ装置の小型化が可能であり、ま
た、同じ間隔ならば検出器自体を小型化しうる。また、
受光範囲の拡大化は検出精度にそれほどの高精度が必要
なくなり、製作が容易となる。According to the invention as claimed in claim 2, the pair of lens parts and the outer envelope are integrally formed, and the relative distance between the light emitting element and the light receiving element is made larger than the relative distance between the optical axes of each lens part. , it is possible to expand the receiving range of reflected light on the recording surface. As a result, the relative distance between the detector and the recording surface can be reduced, and the device can be made smaller by that size.Furthermore, if the distance remains the same, the detector itself can be made smaller. Also,
Expansion of the light-receiving range eliminates the need for extremely high detection accuracy, making manufacturing easier.
また、請求項３記載の発明によれば、受光素子を４分割
としたため、記録面の半径方向の傾斜のみならず、接線
方向の傾斜をも検出でき、検出精度の向上が可能となる
。Further, according to the third aspect of the invention, since the light receiving element is divided into four parts, it is possible to detect not only the radial inclination of the recording surface but also the tangential inclination, and it is possible to improve the detection accuracy.
第１図は本発明の第１実施例を示す立面図、第２図はそ
の平面図、
第３図は第１実施例の受光素子と反射ビームスポットの
位置関係を示す説明図、
第４図は第１実施例の検出器の検出可能範囲と寸法関係
の説明図、
第５図は第１実施例の検出可能限界の説明図、第６図は
本発明の第２実施例を示す立面図、第７図はその平面図
、
第８図は第２実施例の検出可能範囲の説明図、第９図は
第２実施例の受光素子と反射ビームスポットの位置関係
を示す説明図、
第１０図は第２実施例による検出器の小型化の説明図、
第１１図は本発明の第３実施例を示す説明図、第１２図
は受光素子の配置例を示す説明図、第１３図は従来例を
示す断面図である。
Ｄ・・・ディスク
６・・・外囲部
７・・・記録面
８・・・レンズ部
９・・・発光素子
１０・・・受光素子
１０ａ、１０ｂ、１０ｃ、１０ｄ・・・受光領域１１・
・・反射ビームスポット
１２．１３・・・レンズ部
１４．１５・・・中心光軸
１６・・・焦点面
ｄｌ・・・発光素子と受光素子の相対間隔ｄ２・・・光
軸相対間隔
θ、θ１・・・検出可能範囲
θ１・・・傾き誤差FIG. 1 is an elevation view showing the first embodiment of the present invention, FIG. 2 is a plan view thereof, FIG. 3 is an explanatory diagram showing the positional relationship between the light receiving element and the reflected beam spot of the first embodiment, and FIG. FIG. 5 is an explanatory diagram of the detectable range and dimensional relationship of the detector of the first embodiment, FIG. 5 is an explanatory diagram of the detectable limit of the first embodiment, and FIG. 6 is a diagram showing the second embodiment of the present invention. 7 is a plan view thereof, FIG. 8 is an explanatory diagram of the detectable range of the second embodiment, and FIG. 9 is an explanatory diagram showing the positional relationship between the light receiving element and the reflected beam spot of the second embodiment. FIG. 10 is an explanatory diagram of the miniaturization of the detector according to the second embodiment, FIG. 11 is an explanatory diagram showing the third embodiment of the present invention, FIG. 12 is an explanatory diagram showing an example of the arrangement of the light receiving element, and FIG. The figure is a sectional view showing a conventional example. D...Disk 6...Outer part 7...Recording surface 8...Lens part 9...Light emitting element 10...Light receiving elements 10a, 10b, 10c, 10d...Light receiving area 11.
...Reflected beam spot 12.13...Lens portion 14.15...Central optical axis 16...Focal plane dl...Relative distance between light emitting element and light receiving element d2...Optical axis relative distance θ, θ1...Detectable range θ1...Tilt error
Claims (1)
れた筒状外囲部材内に、前記レンズを介して前記記録面
に検出光を投光する発光素子と、前記検出光の前記記録
面における反射光を前記レンズを介して受光し前記記録
面の傾きに応じた光量に対応する検出信号を出力する受
光素子と、が格納されてなる円盤状記録媒体の傾き検出
器において、 前記レンズと外囲部とを一体に成形したことを特徴とす
る円盤状記録媒体の傾き検出器。２、請求項１記載の円
盤状記録媒体の傾き検出器において、前記レンズは各レ
ンズ中心を通る光軸が平行になるよう配置された２個一
対のレンズ部で構成され、前記発光素子および受光素子
はその相対間隔が前記光軸の相対間隔より広くなる位置
に配置されていることを特徴とする円盤状記録媒体の傾
き検出器。 ３、請求項１記載の円盤状記録媒体の傾き検出器におい
て、前記受光素子は円盤状記録媒体の半径方向に２分割
された領域と前記円盤状記録媒体の接線方向に２分割さ
れた領域とが隣接して配置されてなることを特徴とする
円盤状記録媒体の傾き検出器。[Scope of Claims] 1. A light-emitting element that projects detection light onto the recording surface through the lens, in a cylindrical surrounding member provided with a lens facing the recording surface of the disc-shaped recording medium; , a light-receiving element that receives reflected light of the detection light on the recording surface via the lens and outputs a detection signal corresponding to the amount of light according to the inclination of the recording surface. A tilt detector for a disc-shaped recording medium, characterized in that the lens and the outer envelope are integrally molded. 2. In the disk-shaped recording medium inclination detector according to claim 1, the lens is composed of a pair of lens parts arranged so that optical axes passing through the center of each lens are parallel to each other, and the light emitting element and the light receiving element are connected to each other. A tilt detector for a disc-shaped recording medium, characterized in that the elements are arranged at positions where the relative spacing between the elements is wider than the relative spacing between the optical axes. 3. In the inclination detector for a disc-shaped recording medium according to claim 1, the light-receiving element has an area divided into two in the radial direction of the disc-shaped recording medium and an area divided into two in the tangential direction of the disc-shaped recording medium. What is claimed is: 1. A tilt detector for a disc-shaped recording medium, characterized in that: are arranged adjacent to each other.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63198143A JPH0781852B2 (en) | 1988-08-09 | 1988-08-09 | Tilt detector for disk-shaped recording medium |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63198143A JPH0781852B2 (en) | 1988-08-09 | 1988-08-09 | Tilt detector for disk-shaped recording medium |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0247508A true JPH0247508A (en) | 1990-02-16 |
| JPH0781852B2 JPH0781852B2 (en) | 1995-09-06 |
Family
ID=16386173
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP63198143A Expired - Fee Related JPH0781852B2 (en) | 1988-08-09 | 1988-08-09 | Tilt detector for disk-shaped recording medium |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0781852B2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH05204576A (en) * | 1992-01-24 | 1993-08-13 | Nec Corp | Dynamic scenario presenting method |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6269111A (en) * | 1985-09-24 | 1987-03-30 | Sony Corp | Reflection type inclination detecting element |
-
1988
- 1988-08-09 JP JP63198143A patent/JPH0781852B2/en not_active Expired - Fee Related
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6269111A (en) * | 1985-09-24 | 1987-03-30 | Sony Corp | Reflection type inclination detecting element |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH05204576A (en) * | 1992-01-24 | 1993-08-13 | Nec Corp | Dynamic scenario presenting method |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0781852B2 (en) | 1995-09-06 |
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