JPS62164236A - Optical information reproducing device - Google Patents
Optical information reproducing deviceInfo
- Publication number
- JPS62164236A JPS62164236A JP61005416A JP541686A JPS62164236A JP S62164236 A JPS62164236 A JP S62164236A JP 61005416 A JP61005416 A JP 61005416A JP 541686 A JP541686 A JP 541686A JP S62164236 A JPS62164236 A JP S62164236A
- Authority
- JP
- Japan
- Prior art keywords
- light
- photodetector
- reflected
- substrate
- receiving surface
- 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
Landscapes
- Optical Head (AREA)
- Optical Recording Or Reproduction (AREA)
Abstract
Description
【発明の詳細な説明】 産業上の利用分野 本発明は、光学的情報再生装置に関するものである。[Detailed description of the invention] Industrial applications The present invention relates to an optical information reproducing device.
従来の技術
従来の光学的情報再生装置の構成を第６図に示す。半導
体レーザ１７から出射した光は、光透過性基板１４に積
層した光学的記録媒体１３の信号面に、基板側よシ対物
レンズ１５によって集光されるとともに、信号面からの
反射光は前記対物し３ベージ
ンズ１５と集光レンズ１９を介して光検出器２０の受光
面に入射し、電気信号に変換される。BACKGROUND OF THE INVENTION The configuration of a conventional optical information reproducing device is shown in FIG. The light emitted from the semiconductor laser 17 is focused on the signal surface of the optical recording medium 13 laminated on the light-transmitting substrate 14 by the objective lens 15 from the substrate side, and the light reflected from the signal surface is focused on the signal surface of the optical recording medium 13 laminated on the transparent substrate 14. The light enters the light-receiving surface of the photodetector 20 via the three-basins 15 and the condensing lens 19, and is converted into an electrical signal.
発明が解決しようとする問題点
このような従来の光学的情報再生装置の構成では、光検
出器２０の受光面に信号面から反射光とともに光透過性
基板の光照射側表面１４ａがらの反射光が入射し、それ
らが互いに干渉する。これによってノイズが増加し、再
生ＳＮ比が劣化するという問題点があった。Problems to be Solved by the Invention In the configuration of such a conventional optical information reproducing device, light reflected from the signal surface as well as light reflected from the light irradiation side surface 14a of the light-transmissive substrate is transmitted to the light-receiving surface of the photodetector 20. are incident and they interfere with each other. This poses a problem in that noise increases and the reproduction S/N ratio deteriorates.
本発明は、このような従来の問題点を解決し、再生ＳＮ
比の良好な光学的情報再生装置を提供するととを目的と
する。The present invention solves these conventional problems and
An object of the present invention is to provide an optical information reproducing device with a good ratio.
問題点を解決するだめの手段
との目的を達成させるために、本発明は次のような装置
構成とする。すなわち、光透過性の基板に情報記録媒体
を積層した光学的記録媒体の信号面に、前記基板側より
、光源から放射された光束を対物レンズによって収束さ
せるとともに、この光学的記録媒体の信号面から反射さ
れた反射光束を光検出器の受光面に入射させる光学的情
報再生装置であって、前記基板の光照射側表面からの反
射光が前記光検出器の受光面に入射しないようにしたも
のである。In order to achieve the purpose of solving the problems, the present invention has the following device configuration. That is, an objective lens converges the light beam emitted from a light source from the substrate side onto the signal surface of an optical recording medium in which an information recording medium is laminated on a light-transmitting substrate. An optical information reproducing device that causes a reflected light flux reflected from a light beam to enter a light receiving surface of a photodetector, wherein the light reflected from the light irradiation side surface of the substrate is prevented from entering the light receiving surface of the photodetector. It is something.
作 用
本発明のような構成とすると、光源から放射された光束
は光学的記録媒体の情報記録面と光透過性基板の光照射
側表面とで反射するが、光検出器の受光面には情報記録
面からの反射光のみが入射する。Effect With the configuration of the present invention, the light beam emitted from the light source is reflected by the information recording surface of the optical recording medium and the light irradiation side surface of the light-transmitting substrate, but the light beam is reflected by the light-receiving surface of the photodetector. Only the reflected light from the information recording surface is incident.
実施例 第１実施例 本発明の第１実施例を第１図を参照しながら説明する。Example First example A first embodiment of the present invention will be described with reference to FIG.
第１実施例は、集光レンズ７の焦点位置にスリット８を
設置したものである。半導体レーザ６を出射した光はコ
リメータレンズ６で平行光となり、対物レンズ３によっ
て収束され、光透過性基板２を通過し情報記録媒体１の
信号面上にスポット状に照射される。信号面から反射さ
れた光は対物レンズ３で平行光となり、集光レンズ７に
よって集光されスリット上で焦点を結ぶためスリ６ベー
ノ
ソトを通過し、光検出器９の受光面に入射する。In the first embodiment, a slit 8 is provided at the focal point of the condenser lens 7. The light emitted from the semiconductor laser 6 becomes parallel light by the collimator lens 6, is converged by the objective lens 3, passes through the light-transmitting substrate 2, and is irradiated onto the signal surface of the information recording medium 1 in the form of a spot. The light reflected from the signal plane becomes parallel light by the objective lens 3, is condensed by the condensing lens 7, and is focused on a slit, passes through the slit 6benosoto, and enters the light receiving surface of the photodetector 9.
一方、光透過性基板の光照射側表面２ａより反射された
光は、対物レンズ３によって発散光となって集光レンズ
７に入射するため、スリット８によって遮光され、光検
出器９の受光面には入射しない。On the other hand, the light reflected from the light irradiation side surface 2a of the light-transmitting substrate becomes diverging light by the objective lens 3 and enters the condenser lens 7, so it is blocked by the slit 8, and the light receiving surface of the photodetector 9 is not incident on .
第２実施例 本発明の第２実施例を第２図を参照しながら説明する。Second example A second embodiment of the present invention will be described with reference to FIG.
なお、第１図と同一のものについては同一番号を付す。Components that are the same as those in Figure 1 are given the same numbers.
第２実施例は、集光レンズ了の焦点位置に微小面積の光
検出器１０を設置したものである。情報記録媒体１の信
号面から反射された光は対物レンズ３で平行光となり、
集光レンズ７によって集光され、微小面積の光検出器１
０の受光面」二に焦点を結ぶ。一方、光透過性基板の光
照射側表面２ａより反射された光は、対物レンズ３によ
って発散光となって集光レンズ７に入射するため、光検
出器１０上乎面では広がったビームとなり、微小面積の
光検出器１０の受光面に入射する光量は無視しうるもの
である。In the second embodiment, a photodetector 10 with a small area is installed at the focal point of the condenser lens. The light reflected from the signal surface of the information recording medium 1 becomes parallel light at the objective lens 3,
The light is focused by a condensing lens 7, and the photodetector 1 has a small area.
Focus on the light-receiving surface of 0. On the other hand, the light reflected from the light irradiation side surface 2a of the light-transmitting substrate becomes diverging light by the objective lens 3 and enters the condenser lens 7, so it becomes a spread beam on the upper surface of the photodetector 10. The amount of light incident on the light receiving surface of the photodetector 10, which has a small area, can be ignored.
６ページ
第３実施例
本発明の第３実施例を第３図、第４図を参照しながら説
明する。なお、第１図と同一のものについては同一番号
を付す。第３実施例は、集光レンズ７と光検出器９の間
にフーコープリズム１１を設置したものである。情報記
録媒体１の信号面から反射された光は対物レンズ３で平
行光となり、集光レンズ７で集光され、第４図ａに示す
ようにフーコープリズムによって光検出器９の受光面に
斜線のような像を結ぶ。一方、光透過性基板の光照射側
表面２ａより反射された光は、対物レンズ３によって発
散光となって集光レンズ７に入射し、ＩＮ ４ 図すに
示すようにフーコープリズムによって光検出器９上平面
に斜線のような像を結び、受光面には入射しない。Page 6 Third Embodiment A third embodiment of the present invention will be described with reference to FIGS. 3 and 4. Components that are the same as those in Figure 1 are given the same numbers. In the third embodiment, a Foucault prism 11 is installed between a condenser lens 7 and a photodetector 9. The light reflected from the signal surface of the information recording medium 1 becomes parallel light by the objective lens 3, is condensed by the condenser lens 7, and is formed into a diagonal line on the light receiving surface of the photodetector 9 by the Foucault prism, as shown in FIG. 4a. Tie a statue like this. On the other hand, the light reflected from the light irradiation side surface 2a of the light-transmitting substrate becomes diverging light by the objective lens 3 and enters the condenser lens 7, and is detected by the Foucault prism as shown in the figure. 9 forms an image like a diagonal line on the upper plane and does not enter the light receiving surface.
第４実施例 本発明の第４実施例を第５図を参照しながら説明する。Fourth example A fourth embodiment of the present invention will be described with reference to FIG.
なお、第１図と同一のものについては同一番号を付す。Components that are the same as those in Figure 1 are given the same numbers.
第４実施例は、対物レンズ３と光検出器９ａ、９ｂの間
に臨界角プリズム１２ａ。In the fourth embodiment, a critical angle prism 12a is provided between the objective lens 3 and the photodetectors 9a and 9b.
Ｙ７、−
１２ｂを設置したものである。情報記録媒体１の信号面
から反射された光は対物レンズ３で平行光となり、この
平行光に対して臨界角に設置した臨界角プリズム１２ａ
、１２ｂで反射１．、光検出器９ａ、９ｂの受光面に入
射する。一方、光透過性基板の光照射側表面２ａより反
射された光は、対物レンズ３によって発散光となるため
、臨界角プリズム１２＆、１２ｂで透過し、光検出器９
ａ。Y7, -12b is installed. The light reflected from the signal surface of the information recording medium 1 becomes parallel light by the objective lens 3, and a critical angle prism 12a installed at a critical angle with respect to this parallel light
, 12b reflected 1. , are incident on the light receiving surfaces of the photodetectors 9a and 9b. On the other hand, the light reflected from the light irradiation side surface 2a of the light-transmitting substrate becomes diverging light by the objective lens 3, and is transmitted through the critical angle prisms 12&, 12b, and is detected by the photodetector 9.
a.
９ｂには入射しない。It does not enter 9b.
発明の効果
本発明に係る光学的情報再生装置の構成は次のようであ
る。光透過性の基板に情報記録媒体を積層した光学的記
録媒体の信号面に、基板側より光源から放射された光束
を対物レンズによって収束させるとともに、この光学的
記録媒体の信号面から反射された反射光束を光検１１」
器の受光面に入射させる光学的情報再生装置であって、
前記基板の光照射側表面からの反射光が光検出器の受光
面に入射しないようにしたものである。これによって光
検出器の受光面には光学的記録媒体の信号面からの反射
光のみが入射するため、基板の光照射側表面からの反射
光との干渉がなく、良好な再生ＳＮ比が得られる。Effects of the Invention The configuration of the optical information reproducing device according to the present invention is as follows. An objective lens converges the light beam emitted from a light source from the substrate side onto the signal surface of an optical recording medium in which an information recording medium is laminated on a light-transmissive substrate, and the light beam reflected from the signal surface of this optical recording medium is converged by an objective lens. Optical detection of reflected light flux 11
An optical information reproducing device that makes light enter a light receiving surface of a device,
The light reflected from the light irradiation side surface of the substrate is prevented from entering the light receiving surface of the photodetector. As a result, only the reflected light from the signal surface of the optical recording medium is incident on the light receiving surface of the photodetector, so there is no interference with the reflected light from the light-irradiated surface of the substrate, and a good reproduction S/N ratio can be achieved. It will be done.
第１図は本発明の第１実施例における光学的情報再生装
置の構成図、第２図は本発明の第２実施例における光学
的情報再生装置の構成図、第３図は本発明の第３実施例
における光学的情報再生装置の構成図、第４図ａ、ｂは
第３図の装置の動作説明図、第６図は本発明の第４実施
例における光学的情報再生装置の構成図、第６図は従来
例における光学的情報再生装置の構成図である。
１・・・・・・情報記録媒体、２・・・・・光透過性基
板、３・・・・・対物レンズ、了・・・・・・集光レン
ズ、８・・・・・・スリット、９・・・・・・光検出器
、１ｏ・・・・・・微小面積光検出器、１１−−フーコ
ープリズム、１２ａ、１２ｂ・・・・・臨界角プリズム
。
代理人の氏名 弁理士 中 尾 敏 男 ほか１名第３
図
第４図
Ｉ
特開口ＧＧ２−１６４２３６ （４）第５図
第６図
／、、３
α Ｍ
／（ｊ ｑ
−２θFIG. 1 is a block diagram of an optical information reproducing apparatus according to a first embodiment of the present invention, FIG. 2 is a block diagram of an optical information reproducing apparatus according to a second embodiment of the present invention, and FIG. 3 is a block diagram of an optical information reproducing apparatus according to a second embodiment of the present invention. FIG. 4 a and b are explanatory diagrams of the operation of the device in FIG. 3; FIG. 6 is a configuration diagram of the optical information reproducing device in the fourth embodiment of the present invention. , FIG. 6 is a block diagram of a conventional optical information reproducing apparatus. 1...Information recording medium, 2...Light transmitting substrate, 3...Objective lens, End...Condensing lens, 8...Slit , 9...Photodetector, 1o...Minute area photodetector, 11--Foucault prism, 12a, 12b...Critical angle prism. Name of agent: Patent attorney Toshio Nakao and 1 other person No. 3
Figure 4 I Special aperture GG2-164236 (4) Figure 5 Figure 6 /, 3 α M /(j q −2θ
Claims (5)
記録媒体の信号面に、前記基板側より、光源から放射さ
れた光束を対物レンズによって収束させるとともに、こ
の光学的記録媒体の信号面から反射された反射光束を光
検出器の受光面に入射させる光学的情報再生装置であっ
て、前記基板の光照射側表面からの反射光が前記光検出
器の受光面に入射しないようにした光学的情報再生装置
。(1) An objective lens converges the light beam emitted from a light source from the substrate side onto the signal surface of an optical recording medium in which an information recording medium is laminated on a light-transmissive substrate, and the signal of this optical recording medium is An optical information reproducing device that causes a reflected light beam reflected from a surface to enter a light receiving surface of a photodetector, the optical information reproducing device comprising: preventing light reflected from the light irradiation side surface of the substrate from entering the light receiving surface of the photodetector; optical information reproducing device.
この反射光束の焦点位置にスリットを設け、基板の光照
射側表面からの反射光が光検出器の受光面に入射しない
ようにした特許請求の範囲第１項記載の光学的情報再生
装置。(2) Converge the light flux reflected from the signal surface,
2. The optical information reproducing device according to claim 1, wherein a slit is provided at the focal point of the reflected light beam to prevent the reflected light from the light irradiation side surface of the substrate from entering the light receiving surface of the photodetector.
この反射光束の焦点位置に微小面積光検出器を設け、前
記基板の光照射側表面からの反射光が前記光検出器の受
光面に入射しないようにした特許請求の範囲第１項記載
の光学的情報再生装置。(3) Converge the light flux reflected from the signal surface,
The optical system according to claim 1, wherein a small-area photodetector is provided at the focal point of the reflected light beam, and the reflected light from the light-irradiation side surface of the substrate is prevented from entering the light-receiving surface of the photodetector. information reproducing device.
光照射側表面からの反射光が前記光検出器の受光面に入
射しないようにした特許請求の範囲第１項記載の光学的
情報再生装置。(4) Optical information according to claim 1, wherein a Foucault prism is provided in front of the photodetector to prevent reflected light from the light irradiation side surface of the substrate from entering the light receiving surface of the photodetector. playback device.
照射側表面からの反射光が前記光検出器の受光面に入射
しないようにした特許請求の範囲第１項記載の光学的情
報再生装置。(5) The optical system according to claim 1, wherein a critical angle prism is provided in front of the photodetector to prevent reflected light from the light irradiation side surface of the substrate from entering the light receiving surface of the photodetector. Information reproducing device.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP61005416A JPS62164236A (en) | 1986-01-14 | 1986-01-14 | Optical information reproducing device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP61005416A JPS62164236A (en) | 1986-01-14 | 1986-01-14 | Optical information reproducing device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS62164236A true JPS62164236A (en) | 1987-07-20 |
Family
ID=11610541
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP61005416A Pending JPS62164236A (en) | 1986-01-14 | 1986-01-14 | Optical information reproducing device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS62164236A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS63193356A (en) * | 1987-02-06 | 1988-08-10 | Nec Corp | Magneto-optical head |
| US5487060A (en) * | 1991-06-04 | 1996-01-23 | International Business Machines Corporation | Multiple data surface data storage system and method |
| EP0713212A3 (en) * | 1994-11-17 | 1997-03-05 | Canon Kk | Optical information recording and reproducing apparatus |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5589459A (en) * | 1978-12-27 | 1980-07-07 | Daido Steel Co Ltd | Boron-containing stainless steel having good corrosion resistance and workability |
| JPS6039118A (en) * | 1983-08-12 | 1985-02-28 | Kobe Steel Ltd | Manufacture of austenitic stainless steel containing boron and having superior resistance to intergranular corrosion and intergranular stress corrosion cracking |
-
1986
- 1986-01-14 JP JP61005416A patent/JPS62164236A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5589459A (en) * | 1978-12-27 | 1980-07-07 | Daido Steel Co Ltd | Boron-containing stainless steel having good corrosion resistance and workability |
| JPS6039118A (en) * | 1983-08-12 | 1985-02-28 | Kobe Steel Ltd | Manufacture of austenitic stainless steel containing boron and having superior resistance to intergranular corrosion and intergranular stress corrosion cracking |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS63193356A (en) * | 1987-02-06 | 1988-08-10 | Nec Corp | Magneto-optical head |
| US5487060A (en) * | 1991-06-04 | 1996-01-23 | International Business Machines Corporation | Multiple data surface data storage system and method |
| US5615186A (en) * | 1991-06-04 | 1997-03-25 | International Business Machines Corporation | Multiple data surface data storage system with holographic filter element |
| EP0713212A3 (en) * | 1994-11-17 | 1997-03-05 | Canon Kk | Optical information recording and reproducing apparatus |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| JPS6251047A (en) | Optical head device | |
| JPH076379A (en) | Optical head and optical recording and reproducing method | |
| JPS6118918A (en) | Beam shaping optical system | |
| JPS62164236A (en) | Optical information reproducing device | |
| JPS62173650A (en) | Optical information reproducing device | |
| JPH07192281A (en) | Optical pickup device | |
| JPH05273491A (en) | Photodetector | |
| JPS5879207A (en) | Optical pickup device | |
| JP2763174B2 (en) | Optical pickup device | |
| JPH0542736B2 (en) | ||
| JPS6123572B2 (en) | ||
| JPH11328765A (en) | Magneto-optical head device | |
| JPS6256581B2 (en) | ||
| GB2315910A (en) | Optical pickup system for reading information recorded on an optical disk | |
| JPS6192439A (en) | Optical type information recording and reproducing device | |
| JPS58208945A (en) | Method and apparatus for detecting focus | |
| JPS62248139A (en) | Focus detector | |
| JPH08212569A (en) | Optical head device | |
| JPH02183125A (en) | Polarized light detector and optical head | |
| JPS6093642A (en) | Optical head | |
| JP2730133B2 (en) | Optical card processing equipment | |
| JPS63205826A (en) | Optical reproducing device | |
| JPH0612697A (en) | Optical pickup | |
| JPS61122936A (en) | Focus detecting device | |
| JPH04301223A (en) | Aligning method for optical element |