JPS63117334A - Optical information reproducing device - Google Patents
Optical information reproducing deviceInfo
- Publication number
- JPS63117334A JPS63117334A JP61261858A JP26185886A JPS63117334A JP S63117334 A JPS63117334 A JP S63117334A JP 61261858 A JP61261858 A JP 61261858A JP 26185886 A JP26185886 A JP 26185886A JP S63117334 A JPS63117334 A JP S63117334A
- Authority
- JP
- Japan
- Prior art keywords
- optical
- objective lens
- light
- photodetector
- angle
- 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
- 230000003287 optical effect Effects 0.000 title claims abstract description 64
- 238000005286 illumination Methods 0.000 claims abstract description 19
- 239000011241 protective layer Substances 0.000 claims description 10
- 238000000034 method Methods 0.000 claims 1
- 230000015572 biosynthetic process Effects 0.000 abstract 1
- 238000010586 diagram Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000007796 conventional method Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 229920000515 polycarbonate Polymers 0.000 description 1
- 239000004417 polycarbonate Substances 0.000 description 1
- 239000011347 resin Substances 0.000 description 1
- 229920005989 resin Polymers 0.000 description 1
Landscapes
- Credit Cards Or The Like (AREA)
- Optical Recording Or Reproduction (AREA)
- Optical Head (AREA)
Abstract
Description
【発明の詳細な説明】
〔産業上の利用分野〕
この発明は、光カード、コンパクトディスク、ビデオデ
ィスクや光磁気ディスク等の光学式記録媒体に記録され
た情報を再生する光学式情報再生装置に関する。[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to an optical information reproducing device for reproducing information recorded on optical recording media such as optical cards, compact discs, video discs, and magneto-optical discs. .
例えば、情報を・光学的に読取り得るようにカードに記
録したり、この光カードに記録されている情報を光学的
に読取るようにした光カードによる情報の記録および／
または再生装置が従来提案されている。For example, information may be recorded on a card in an optically readable manner, or information recorded on an optical card may be recorded on an optical card that is optically readable.
Or a playback device has been proposed in the past.
このような光カードにおける情報の再生装置として、従
来、第５図に示すようにフォトダイオード１からの照明
光をレンズ２によって平行光束とした後、ミラー３およ
び対物レンズ４を経て光カード５に投射し、その反射光
を対物レンズ４、ミラー６およびレンズ７を経て光検出
器８に入射させるようにしたものや、第６図に示すよう
にフォトダイオード１からの照明光をレンズ２およびミ
ラー３を経てハーフミラ−９に導いてその透過光を対物
レンズ４を経て光カード５に投射し、該光カード５での
反射光を対物レンズ４を経てハーフミラ−９に導いてそ
の反射光をレンズ７を経て光検出器８に入射させるよう
にしたものが提案されている。Conventionally, as an information reproducing device for such an optical card, as shown in FIG. The illumination light from the photodiode 1 is transmitted through the lens 2 and the mirror as shown in FIG. 3 to a half mirror 9, the transmitted light is projected onto an optical card 5 via an objective lens 4, the reflected light from the optical card 5 is guided to a half mirror 9 via an objective lens 4, and the reflected light is projected onto a half mirror 9 through an objective lens 4. It has been proposed that the light is made incident on the photodetector 8 through the photodetector 7.
しかしながら、上述した従来の再生装置にあっては、対
物レンズ４をその光軸が光カード５に対して垂直となる
ように配置して照明光および反射光を導くようにしてい
るため、光カードの垂直方向における光学系全体の構成
が大形になるという問題がある。However, in the conventional playback device described above, the objective lens 4 is arranged so that its optical axis is perpendicular to the optical card 5 to guide illumination light and reflected light. There is a problem in that the overall configuration of the optical system becomes large in the vertical direction.
この発明は、このような従来の問題点に着目してなされ
たもので、光学系を小形にできるよう適切に構成した光
学式情報再生装置を提供することを目的とする。The present invention has been made in view of these conventional problems, and it is an object of the present invention to provide an optical information reproducing device suitably configured so that the optical system can be made compact.
〔問題点を解決するための手段および作用〕上記目的を
達成するため、この発明では情報を光学的に記録した記
録面上を透光性の保護層で被覆して成る光学式記録媒体
に、投光手段により照明光をスポット状に投射し、その
反射光を対物レンズを経て光検出器に導いて情報を再生
するようにした光学式情報再生装置において、前記照明
光が前記光学式記録媒体に対してθの入射角をもって斜
めから入射するように前記投光手段を構成すると共に、
この照明光の前記光学式記録媒体での正反射光を集光す
るように、前記対物レンズをその光軸が前記入射角の方
向とは反対方向にほぼθの角度となるように配置し、か
つ前記対物レンズによる前記光学式記録媒体の記録面の
像が前記光検出器に結像されるように、該光検出器をそ
の法線と前記対物レンズの光軸との成す角度θ′が、前
記保護層の屈折率をｎとするとき、ｓｉｎ θ：ｓｉｎ
θ”＝ｎ：１をほぼ満足するように配置する。[Means and effects for solving the problem] In order to achieve the above object, the present invention provides an optical recording medium in which the recording surface on which information is optically recorded is coated with a transparent protective layer. In an optical information reproducing apparatus, the illumination light is projected in a spot shape by a light projecting means, and the reflected light is guided to a photodetector through an objective lens to reproduce information. The light projecting means is configured such that the light enters the light obliquely at an incident angle of θ, and
The objective lens is arranged so that its optical axis is at an angle of approximately θ in a direction opposite to the direction of the incident angle so as to collect the specularly reflected light of the illumination light on the optical recording medium, and the angle θ' between the normal line of the photodetector and the optical axis of the objective lens is such that the image of the recording surface of the optical recording medium formed by the objective lens is formed on the photodetector. , when the refractive index of the protective layer is n, sin θ: sin
They are arranged so that θ''=n:1 is approximately satisfied.
第１図はこの発明の第１実施例を示すものである。この
実施例では、発光ダイオード等の光源１１からの光を照
明レンズ１２を経て光カード１３にθ（例えば２５°）
の入射角をもって斜めから投射して、該光カード１３を
スポット状に照明し、その反射光を対物レンズ１４を経
て光検出器１５に入射させる。対物レンズ１４は、光カ
ード１３での正反射光を集光するように、その光軸が入
射角θの方向とは反対方向にほぼθの角度となるように
配置する。FIG. 1 shows a first embodiment of the invention. In this embodiment, light from a light source 11 such as a light emitting diode is transmitted through an illumination lens 12 to an optical card 13 at an angle of θ (for example, 25°).
The light is projected obliquely at an incident angle of , illuminating the optical card 13 in a spot shape, and the reflected light is made to enter the photodetector 15 via the objective lens 14 . The objective lens 14 is arranged so that its optical axis is at an angle of approximately θ in a direction opposite to the direction of the incident angle θ so as to condense the specularly reflected light from the optical card 13.
ここで、光カード１３は記録面１３ａ上に樹脂等の透光
性の保護層１３ｂが被着され、この保護層１３ｂの屈折
率ｎによって対物レンズ１４から見た記録面１３ａの物
体面１６は仮想線で示すようになり、この物体面１６の
法線と対物レンズ１４の光軸との成す角度θ′は、光カ
ード１３の法線と対物レンズ１４の光軸との成す角度θ
よりも小さくなり、例えば保護層１３ｂを屈折率ｎ＝１
．５のポリカーボネートにより厚さ０．４酊に形成した
場合には、θ＝２５°のときθ′はほぼ１６６となる。Here, in the optical card 13, a transparent protective layer 13b made of resin or the like is adhered on the recording surface 13a, and the object plane 16 of the recording surface 13a seen from the objective lens 14 is determined by the refractive index n of this protective layer 13b. The angle θ' between the normal to the object surface 16 and the optical axis of the objective lens 14 is equal to the angle θ between the normal to the optical card 13 and the optical axis of the objective lens 14, as shown by a virtual line.
For example, the protective layer 13b has a refractive index n=1.
．． When formed of polycarbonate No. 5 to a thickness of 0.4 mm, θ' becomes approximately 166 when θ=25°.
そこで、この実施例では対物レンズ１４における物体面
１６の傾きに対応して、光検出器１５上に照明光のスポ
ットに対応した真円状の像が結像されるように、該光検
出器１５をその法線と対物レンズ１４の光軸との成す角
度がθ″となるように傾けて配置する。Therefore, in this embodiment, in accordance with the inclination of the object surface 16 in the objective lens 14, the photodetector 15 is arranged such that a perfect circular image corresponding to the spot of illumination light is formed on the photodetector 15. 15 is tilted and arranged so that the angle between its normal line and the optical axis of the objective lens 14 is θ''.
この実施例によれば、光力・−ド１３に対して照明光を
斜めから投射し、その正反射光を対物レンズ１４を経て
光検出器１５で受光するようにしたので、照明光を垂直
方向から投射する場合に比べ、光学系全体の構成を小形
にできる。また、光カード１３の保護層１３ｂによる対
物レンズ１４の物体面１６の傾きに応じて、光検出器１
５を対物レンズ１４の光軸に対して傾けて配置したので
、スポット照明された記録面１３ａの像を光検出器１５
上に真円で全体が同じ結像状態となるように結像させる
ことができ、したがって情報を正確に再生することがで
きる。According to this embodiment, the illumination light is projected obliquely onto the light source 13, and the specularly reflected light is received by the photodetector 15 through the objective lens 14, so that the illumination light is projected vertically. The overall configuration of the optical system can be made smaller than when projecting from any direction. Also, depending on the inclination of the object plane 16 of the objective lens 14 due to the protective layer 13b of the optical card 13, the photodetector 1
5 is tilted with respect to the optical axis of the objective lens 14, so that the image of the spot-illuminated recording surface 13a is detected by the photodetector 15.
It is possible to form an image so that the entire image is in the same state as a perfect circle, and therefore information can be accurately reproduced.
第２図はこの発明の第２実施例の要部を示すものである
。この実施例は、対物レンズ１４を経た光カード１３か
らの反射光をミラー１７を経て光検出器１５に入射させ
るようにしたもので、その他の構成は第１実施例と同様
である。このように、ミラーｌ７によって光束を反射さ
せるようにすれば、光カード１３の垂直方向における光
学系の寸法をさらに小さくでき、したがって全体をより
コンパクトにできるという利点がある。FIG. 2 shows the main part of a second embodiment of the invention. In this embodiment, reflected light from an optical card 13 that has passed through an objective lens 14 is made to enter a photodetector 15 via a mirror 17, and the other configurations are the same as in the first embodiment. If the light beam is reflected by the mirror 17 in this manner, there is an advantage that the dimensions of the optical system in the vertical direction of the optical card 13 can be further reduced, and the whole can therefore be made more compact.
第３図ＡおよびＢは第２図に示した光学系を有するアク
チュエータの一例の構成を一部断面で示す正面図および
平面図である。この例では、全体を小形にし、かつ重心
を保つために、ホルダ１８の内部において一方の側に光
源１１、照明レンズ１２、対物レンズ１４およびミラー
１７を配置し、他方の側に光検出器１５を配置して、光
源１１からの照明光を照明レンズ１２およびホルダ１８
に形成した開口１８ａを通して光カード１３上にスポッ
ト状に投射し、その反射光を開口１８ａ、対物レンズ１
４およびミラー１７を経て光検出器１５で受光する。3A and 3B are a front view and a plan view, partially in cross section, showing the structure of an example of an actuator having the optical system shown in FIG. 2. FIG. In this example, in order to make the whole compact and maintain the center of gravity, the light source 11, illumination lens 12, objective lens 14, and mirror 17 are arranged on one side inside the holder 18, and the photodetector 15 is placed on the other side. are arranged to direct the illumination light from the light source 11 to the illumination lens 12 and holder 18.
The reflected light is projected onto the optical card 13 in the form of a spot through the aperture 18a formed in the aperture 18a and the objective lens 1.
4 and a mirror 17, the light is received by a photodetector 15.
ホルダ１８は、光カード１３の法線方向すなわちフォー
カス方向およびこのフォーカス方向と直交し、かつ光カ
ード１３の情報トランクと直交する方向すなわちトラッ
キング方向に変位可能に、４本の線状弾性部材１９ａ〜
１９ｄ （１９ｄは図示せず）を介してトラッキング方
向に往復移動するスライダ２０に保持する。また、ホル
ダ１８を上記フォーカス方向およびトラッキング方向に
駆動するため、ホルダ１８の外周にはフォーカス用コイ
ル２１およびトラッキング用コイル２２ａ〜２２ｄを装
着すると共に、スライダ２０にはホルダ１８のトラッキ
ング方向に沿った対向する２辺をそれぞれ挟むようにヨ
ーク２３ａ〜２３ｄを設け、その外側のヨーク２３ａ、
２３ｄの内側に永久磁石２４ａ、 ２４ｂを装着する
。このようにして、永久磁石２４ａによりフォーカス用
コイル２１およびトラッキング用コイル２２ａ、 ２２
ｂを横切る磁界を発生させ、永久磁石２４ｂにより同様
にフォーカス用コイル２１およびトラッキング用コイル
２２ｃ、 ２２ｄを横切る磁界を発生させるようにする
。なお、ホルダ１８にはヨーク２３ｂ、 ２３ｃを通す
ための開口１８ｂ、 １８ｃを形成する。The holder 18 has four linear elastic members 19a to 19a, which are movable in the normal direction of the optical card 13, that is, the focus direction, and in the direction perpendicular to the focus direction and perpendicular to the information trunk of the optical card 13, that is, the tracking direction.
19d (19d is not shown) is held by the slider 20 which reciprocates in the tracking direction. Further, in order to drive the holder 18 in the focusing direction and the tracking direction, a focusing coil 21 and tracking coils 22a to 22d are attached to the outer periphery of the holder 18, and the slider 20 is provided with a focusing coil 21 and tracking coils 22a to 22d. Yokes 23a to 23d are provided so as to sandwich two opposing sides, and the outer yokes 23a,
Permanent magnets 24a and 24b are attached to the inside of 23d. In this way, the focusing coil 21 and the tracking coils 22a, 22 are controlled by the permanent magnet 24a.
A magnetic field that crosses the focusing coil 21 and the tracking coils 22c and 22d is generated by the permanent magnet 24b. Note that openings 18b and 18c are formed in the holder 18 through which the yokes 23b and 23c pass.
第４図は上述した光検出器１５における受光領域の配置
例を示すものである。光カードの再生装置においては、
一般に、光カードにその情報トラック方向に沿って予め
印刷等により所定の間隔てガイドパターンを形成し、こ
のガイドパターンを光学的に読取ってクロック信号を得
、このクロツタ信号に同期して情報の再生信号、フォー
カスエラー信号、トラッキングエラー信号等を検出する
ようにしている。そこで、この例では光検出器１５をク
ロック発生用の受光領域２５ａ〜２５ｄ１フオーカス用
の受光領域２６ａ、 ２６ｂ、トラッキング用の受光、
領域２７ａ、 ２７ｂおよび情報読取り用の受光領域２
８ａ〜２８ｈをもって構成し、受光領域２５ａ 〜２５
ｄ、 ２６ａ。FIG. 4 shows an example of the arrangement of light receiving areas in the photodetector 15 described above. In optical card playback devices,
Generally, a guide pattern is formed on an optical card at predetermined intervals by printing or the like along the direction of the information track, the guide pattern is read optically to obtain a clock signal, and the information is reproduced in synchronization with this clock signal. It is designed to detect signals, focus error signals, tracking error signals, etc. Therefore, in this example, the photodetector 15 is divided into light receiving areas 25a to 25d for clock generation, light receiving areas 26a and 26b for focusing, light receiving areas for tracking,
Areas 27a, 27b and light receiving area 2 for reading information
8a to 28h, and light receiving areas 25a to 25
d, 26a.
２６ｂ、 ２７ａ、 ２７ｂを仮想線で示すように光カ
ード１３のガイドパターン１３ｃの像に対応させて、受
光領域２５ａ、 ２５ｃおよび２５ｂ、 ２５ｄのそれ
ぞれの出力の和の差からクロック信号を検出し、これに
同期して受光領域２６ａ、 ２６ｂの出力の差からフォ
ーカスエラー信号を、受光領域２７ａ、 ２７ｂの出力
の差からトラッキングエラー信号を検出してそれらに応
じた電流を、第３図Ａ、Ｂにおいて、フォーカス用コイ
ル２１、トラッキング用コイル２２ａ〜２２ｄに供給し
てフォーカス制御およびトラッキング制御を行いながら
受光領域２８ａ〜２８ｈで情報を読取るようにする。こ
こで、第４図に仮想線で示す円２９は、光検出器１５上
で結像される光カード１３のスポット像を示すが、この
スポット像２９は上述したように真円で、しかも全体が
合焦状態で結像される。したがって、各種の信号を常に
安定して精度良く検出することができる。26b, 27a, 27b are made to correspond to the image of the guide pattern 13c of the optical card 13 as shown by virtual lines, and a clock signal is detected from the difference in the sum of the outputs of the light receiving areas 25a, 25c and 25b, 25d, In synchronization with this, a focus error signal is detected from the difference in the outputs of the light receiving areas 26a and 26b, and a tracking error signal is detected from the difference in the outputs of the light receiving areas 27a and 27b. In this case, the information is read in the light receiving areas 28a to 28h while the focusing coil 21 and the tracking coils 22a to 22d are supplied with the information to perform focus control and tracking control. Here, a circle 29 shown by a virtual line in FIG. 4 indicates a spot image of the optical card 13 formed on the photodetector 15, but this spot image 29 is a perfect circle as described above, and moreover, is imaged in focus. Therefore, various signals can always be detected stably and accurately.
なお、この発明は上述した実施例にのみ限定されるもの
ではなく、幾多の変形または変更が可能である。例えば
、この発明は上述した光カードの再生装置のみでなく、
コンパクトディスクやビデオディスク等地の光学式記録
媒体を用いる再生装置にも有効に適用することができる
。また、光学系をフォーカス方向およびトラッキング方
向に変位させるための支持手段や駆動手段は第３［ｆｆ
１Ａ。Note that this invention is not limited only to the embodiments described above, and numerous modifications and changes are possible. For example, the present invention is applicable not only to the above-mentioned optical card playback device, but also to
It can also be effectively applied to playback devices using optical recording media such as compact discs and video discs. Further, the supporting means and driving means for displacing the optical system in the focusing direction and the tracking direction are provided in the third [ff
1A.
Ｂに示す構成のものの他、コンパクトディスクプレーヤ
やビデオディスクプレーヤ等において用いられている公
知のものを用いることができる。In addition to the configuration shown in B, known configurations used in compact disc players, video disc players, etc. can be used.
以上述べたように、この発明によれば照明光を斜めから
投射してその正反射光を受光するようにしたので、光学
系全体の構成を小形にできる。また、光学式記録媒体の
保護層による対物レンズの物体面の傾きに応じて、光検
出器を光軸に対して傾けて配置したので、記録面の照明
された部分の全体の像を均一な結像状態で光検出器上に
結像させることができ、したがって情報を常に安定して
正確に読取ることができる。As described above, according to the present invention, since the illumination light is projected obliquely and the specularly reflected light is received, the overall structure of the optical system can be made compact. In addition, the photodetector is tilted with respect to the optical axis in accordance with the tilt of the object plane of the objective lens due to the protective layer of the optical recording medium, so the entire image of the illuminated portion of the recording surface is uniformly distributed. An image can be formed on a photodetector in an imaged state, so that information can always be read stably and accurately.
第１図はこの発明の第１実施例を示す図、第２図は同じ
く第２実施例の要部を示す図、第３図ＡおよびＢは第２
図に示した光学系を有するアクチュエータの一例の構成
を一部断面で示す正面図および平面図、
第４図は光検出器における受光領域の配置例を示す図、
第５図および第６図は従来の技術を示す図である。
１１・・・光源 １２・・・照明レンズ１
３・・・光カード １３ａ・・・記録面１３ｂ
・・・保護層 １３ｃ・・・ガイドパターン１
４・・・対物レンズ １５・・・光検出器１６・
・・物体面 １７・・・ミラー１８・・・ホ
ルダ １８ａ、 １８ｂ、 １８ｃ ・・・
開口１９ａ〜１９ｄ・・・線状弾性部材
２０・・・スライダ ２１・・・フォーカス用
コイル２２ａ〜２２ｄ・・・トラッキング用コイル２３
ａ 〜２３ｄ ・−・ヨーク ２４ａ、 ２４ｂ−永
久磁石２５ａ〜２５ｄ・・・クロック発生用受光領域２
６ａ、 ２６ｂ・・・フォーカス用受光領域２７ａ、
２７ｂ・・・トラッキング用受光領域２８ａ〜２８ｈ・
・・情報読取り用受光領域２９・・・スポット像
第１図
第２図
ｔ６！５αFIG. 1 shows a first embodiment of the invention, FIG. 2 shows the main parts of the second embodiment, and FIGS. 3A and B show the second embodiment.
A front view and a plan view partially showing the configuration of an example of an actuator having the optical system shown in the figure, FIG. 4 is a diagram showing an example of the arrangement of the light receiving area in the photodetector, and FIGS. 5 and 6 are 1 is a diagram showing a conventional technique. 11... Light source 12... Illumination lens 1
3... Optical card 13a... Recording surface 13b
...Protective layer 13c...Guide pattern 1
4... Objective lens 15... Photodetector 16.
...Object plane 17...Mirror 18...Holder 18a, 18b, 18c...
Openings 19a to 19d... Linear elastic member 20... Slider 21... Focusing coils 22a to 22d... Tracking coil 23
a to 23d...Yoke 24a, 24b-Permanent magnets 25a to 25d... Light receiving area 2 for clock generation
6a, 26b... focus light receiving area 27a,
27b...Tracking light receiving area 28a to 28h.
... Information reading light receiving area 29 ... Spot image Figure 1 Figure 2 t6!5α
Claims (1)
で被覆して成る光学式記録媒体に、投光手段により照明
光をスポット状に投射し、その反射光を対物レンズを経
て光検出器に導いて情報を再生するようにした光学式情
報再生装置において、 前記照明光が前記光学式記録媒体に対してθの入射角を
もって斜めから入射するように前記投光手段を構成する
と共に、この照明光の前記光学式記録媒体での正反射光
を集光するように、前記対物レンズをその光軸が前記入
射角の方向とは反対方向にほぼθの角度となるように配
置し、かつ前記対物レンズによる前記光学式記録媒体の
記録面の像が前記光検出器に結像されるように、該光検
出器をその法線と前記対物レンズの光軸との成す角度θ
が、前記保護層の屈折率をｎとするとき、ｓｉｎθ：ｓ
ｉｎθ′＝ｎ：１をほぼ満足するように配置して成る光
学式情報再生装置。[Scope of Claims] 1. A method of projecting illumination light in the form of a spot using a light projecting means onto an optical recording medium whose recording surface on which information is optically recorded is coated with a transparent protective layer. In an optical information reproducing device that reproduces information by guiding reflected light to a photodetector through an objective lens, the illumination light is obliquely incident on the optical recording medium at an incident angle of θ. In addition to forming the light projecting means, the objective lens is arranged so that its optical axis is oriented approximately θ in a direction opposite to the direction of the incident angle so as to condense the specularly reflected light of the illumination light on the optical recording medium. The photodetector is arranged so that the normal line thereof and the objective lens Angle θ with the optical axis
When the refractive index of the protective layer is n, sin θ:s
An optical information reproducing device arranged so as to substantially satisfy inθ'=n:1.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP61261858A JPS63117334A (en) | 1986-11-05 | 1986-11-05 | Optical information reproducing device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP61261858A JPS63117334A (en) | 1986-11-05 | 1986-11-05 | Optical information reproducing device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS63117334A true JPS63117334A (en) | 1988-05-21 |
Family
ID=17367727
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP61261858A Pending JPS63117334A (en) | 1986-11-05 | 1986-11-05 | Optical information reproducing device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS63117334A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002092937A (en) * | 2000-09-21 | 2002-03-29 | Matsushita Electric Ind Co Ltd | Method for adjusting focal point of microoptics system, information reader using the method and device for inspecting optical system using the method |
| JP2011527780A (en) * | 2008-06-30 | 2011-11-04 | シンボル テクノロジーズ， インコーポレイテッド | Imaging module having folded illumination path and imaging path |
-
1986
- 1986-11-05 JP JP61261858A patent/JPS63117334A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002092937A (en) * | 2000-09-21 | 2002-03-29 | Matsushita Electric Ind Co Ltd | Method for adjusting focal point of microoptics system, information reader using the method and device for inspecting optical system using the method |
| JP2011527780A (en) * | 2008-06-30 | 2011-11-04 | シンボル テクノロジーズ， インコーポレイテッド | Imaging module having folded illumination path and imaging path |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| KR100200837B1 (en) | Optical pickup for multi layer optical disc | |
| CA1182912A (en) | Apparatus for reading and/or writing an optically readable information structure | |
| EP0201917B1 (en) | Optical system for an optical memory | |
| KR950004127A (en) | Optical pickup device for magneto-optical disk | |
| KR100213270B1 (en) | Optical pickup for use with a double-sided disk | |
| JPH06101153B2 (en) | Signal detector for magneto-optical disk | |
| JPS63117334A (en) | Optical information reproducing device | |
| JPS59125727U (en) | Optical information pickup device | |
| JP2547983B2 (en) | Optical information recording / reproducing mechanism | |
| JPH0668540A (en) | Optical pickup device | |
| JPH07121901A (en) | Optical pickup apparatus | |
| JPH0636497Y2 (en) | Optical system device | |
| JPH0567345A (en) | Optical substrate type optical information recording/ reproducing device | |
| JPH0644601A (en) | Optical information recording and reproducing device and adjusting method therefor | |
| JPS59113532A (en) | Optical information reproducer | |
| JP2792267B2 (en) | Light head | |
| JPS6223373B2 (en) | ||
| JPH07169085A (en) | Optical information recorder/reproducer | |
| JPS6236760A (en) | Recording and reproducing system | |
| JPH05101435A (en) | Optical head | |
| JPH0391133A (en) | Optical information recording and reproducing device | |
| JPH08306064A (en) | Optical information recording and reproducing device | |
| JPH02158923A (en) | Optical pickup device | |
| JPH0863765A (en) | Optical information recording/reproducing method | |
| JPS63175236A (en) | Optical head device |