JPS62173650A - Optical information reproducing device - Google Patents
Optical information reproducing deviceInfo
- Publication number
- JPS62173650A JPS62173650A JP61016110A JP1611086A JPS62173650A JP S62173650 A JPS62173650 A JP S62173650A JP 61016110 A JP61016110 A JP 61016110A JP 1611086 A JP1611086 A JP 1611086A JP S62173650 A JPS62173650 A JP S62173650A
- Authority
- JP
- Japan
- Prior art keywords
- light
- optical information
- photodetector
- reflected
- face
- 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 description 22
- 230000002093 peripheral effect Effects 0.000 claims abstract description 9
- 230000004907 flux Effects 0.000 abstract description 3
- 239000004065 semiconductor Substances 0.000 abstract description 3
- 238000010586 diagram Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 2
- 239000003795 chemical substances by application Substances 0.000 description 1
- 239000000758 substrate Substances 0.000 description 1
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３図に示す。半導
体レーザ１６から出射した光は、光透過性基板１２に積
層した光学的情報記録媒体１１の信号面に、対物レンズ
１３によって集光されるとともに、信号面からの反射光
は前記対物レンズ１３と集光レンズ１７を介して光検出
器１８の受光面に入射し、電気信号に変換される。2. Description of the Related Art The configuration of a conventional optical information reproducing apparatus is shown in FIG. The light emitted from the semiconductor laser 16 is focused by the objective lens 13 onto the signal surface of the optical information recording medium 11 laminated on the light-transmissive substrate 12, and the reflected light from the signal surface is focused by the objective lens 13. The light enters the light receiving surface of the photodetector 18 through the condensing lens 17 and is converted into an electrical signal.
発明が解決しようとする問題点
光学的情報再生装置において、情報記録媒体の信′号面
から反射した光束のニアフィールドでの近軸領域もしく
はファーフィールドでの周縁領域に情報信号が集中して
いることが知られている。しかし、従来の光学的情報再
生装置の構成では、信号面からの反射光束がすべて光検
出器の受光面に入射しているため、良好な再生ＳＮ比が
得られないという問題点があった。Problem to be Solved by the Invention In an optical information reproducing device, information signals are concentrated in the paraxial region in the near field or the peripheral region in the far field of the light beam reflected from the signal surface of the information recording medium. It is known. However, in the configuration of a conventional optical information reproducing device, all of the reflected light beam from the signal surface is incident on the light receiving surface of the photodetector, so there is a problem that a good reproduction S/N ratio cannot be obtained.
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供給することを目的と
する。The present invention solves these conventional problems and
The 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
こ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、光学的情報記録媒体の信号面に
、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、この光学的情報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、前記信号面からの反射光束の
ニアフィールドでの周縁領域、もしくはファーフィール
ドでの近軸領域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。Means for Solving the Problems In order to achieve this object, the present invention has the following device configuration. That is, the objective lens converges the light beam emitted from the light source onto the signal surface of the optical information recording medium, and the reflected light beam reflected from the signal surface of the optical information recording medium is incident on the light receiving surface of the photodetector. The optical information reproducing device is such that the peripheral region in the near field or the paraxial region in the far field of the reflected light flux from the signal surface does not enter the light receiving surface of the photodetector. .
作 用
本発明のような構成とすると、情報記録媒体の信号面か
ら反射された光束のニアフィールドでの周縁領域もしく
はファーフィールドでの近軸領域が遮光され、情報信号
の集中した光束のみが光検出器の受光面に入射する。Effect: With the configuration of the present invention, the peripheral area in the near field or the paraxial area in the far field of the light beam reflected from the signal surface of the information recording medium is blocked, and only the light beam in which the information signal is concentrated is exposed to light. The light enters the light-receiving surface of the detector.
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 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の焦点近傍にスリット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、情報記録媒体１の信号面上にスポット状に
照射される。In the first embodiment, a slit 8 is provided near the focal point of a condensing lens 7. The light emitted from the semiconductor laser 6 is turned into parallel light by the collimator lens 6, converged by the objective lens 3, and irradiated onto the signal surface of the information recording medium 1 in the form of a spot.
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によって集光され光検出器９の受光面に
入射する。このとき、集光レンズ７の焦点近傍に設置さ
れたスリット８によって、反射光束のニアフィールドで
の周縁領域が遮光され、近軸領域のみが受光面に入射す
る。The light reflected from the signal plane becomes parallel light by the objective lens 3, is focused by the condenser lens 7, and enters the light receiving surface of the photodetector 9. At this time, the peripheral region of the reflected light beam in the near field is blocked by the slit 8 installed near the focal point of the condenser lens 7, and only the paraxial region is incident on the light receiving surface.
本発明の第２実施例を第２図を参照しながら説明する。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、対物レンズ３と集光レンズ７の間に遮光
板１ｏ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によって集光され光検出器９の受光面に入射す
る。このとき、対物レンズ３と集光レンズ７の間に設置
されたスリット８によって、反射光束のファーフィール
ドでの近軸領域が遮光され、周縁領域のみが受光面に入
射する。In the second embodiment, a light shielding plate 1o is installed between the objective lens 3 and the condenser lens 7. The light reflected from the signal surface of the information recording medium 1 is turned into parallel light by the objective lens 3, condensed by the condenser lens 7, and incident on the light receiving surface of the photodetector 9. At this time, the paraxial region of the reflected light beam in the far field is blocked by the slit 8 installed between the objective lens 3 and the condensing lens 7, and only the peripheral region is incident on the light receiving surface.
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。光学的情報記録媒体の信号面に、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
光学的情報記録媒体の信号面から反射された光束を光検
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
、前記信号面からの反射光束のニアフィールドでの周縁
領域、もしくはファーフィールドでの近軸領域が前記光
検出器の受光面に入射しないようにしたものである。こ
れによって光検出器の受光面には、光学的情報記録媒体
の信号面からの反射光束の中で、情報信号の集中した光
束のみが入射するため、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 optical system that converges the light beam emitted from a light source onto the signal surface of an optical information recording medium using an objective lens, and makes the light beam reflected from the signal surface of this optical information recording medium enter the light receiving surface of a photodetector. The information reproducing device is such that the peripheral region in the near field or the paraxial region in the far field of the reflected light beam from the signal surface does not enter the light receiving surface of the photodetector. As a result, only the light beam in which the information signal is concentrated among the light beams reflected from the signal surface of the optical information recording medium is incident on the light-receiving surface of the photodetector, so that a good reproduction S/N ratio can be obtained.
第１図は本発明の第１の実施例における光学的情報再生
装置の原理図、第２図は本発明の第２の実施例における
光学的情報再生装置の原理図、第３図は従来例の光学的
情報再生装置の原理図である。
１・・・・・情報記録媒体、３・・・・・・対物レンズ
、７・・・・・・集光レンズ、８・・・・・スリット、
９・・・・・・光検出器、１ｏ・・・・・・遮光板。
代理人の氏名 弁理士 中 尾 敏 男 ほか１名第１
図
第２図FIG. 1 is a principle diagram of an optical information reproducing apparatus according to a first embodiment of the present invention, FIG. 2 is a principle diagram of an optical information reproducing apparatus according to a second embodiment of the present invention, and FIG. 3 is a conventional example. FIG. 2 is a diagram showing the principle of an optical information reproducing device. 1... Information recording medium, 3... Objective lens, 7... Condensing lens, 8... Slit,
9...Photodetector, 1o...Light shielding plate. Name of agent: Patent attorney Toshio Nakao and 1 other person No. 1
Figure 2
Claims (1)
束を対物レンズによって収束させるとともに、この光学
的情報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
、前記信号面からの反射光束のニアフィールドでの周縁
領域、もしくはファーフィールドでの近軸領域が前記光
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。An optical system that converges the light beam emitted from a light source onto the signal surface of an optical information recording medium using an objective lens, and makes the reflected light beam reflected from the signal surface of this optical information recording medium enter the light receiving surface of a photodetector. an optical information reproducing device in which a peripheral region in the near field or a paraxial region in the far field of the reflected light beam from the signal surface does not enter the light receiving surface of the photodetector. .
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP61016110A JPS62173650A (en) | 1986-01-28 | 1986-01-28 | Optical information reproducing device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP61016110A JPS62173650A (en) | 1986-01-28 | 1986-01-28 | Optical information reproducing device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS62173650A true JPS62173650A (en) | 1987-07-30 |
Family
ID=11907374
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP61016110A Pending JPS62173650A (en) | 1986-01-28 | 1986-01-28 | Optical information reproducing device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS62173650A (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH01317237A (en) * | 1988-06-16 | 1989-12-21 | Sony Corp | Photodetecting device |
| JPH05234121A (en) * | 1992-02-24 | 1993-09-10 | Alps Electric Co Ltd | Optical head device |
| EP0745984A2 (en) * | 1995-05-31 | 1996-12-04 | Nec Corporation | Optical head apparatus |
| EP0713212A3 (en) * | 1994-11-17 | 1997-03-05 | Canon Kk | Optical information recording and reproducing apparatus |
| US7861954B2 (en) | 2005-07-15 | 2011-01-04 | Panasonic Electric Works Co., Ltd. | Electrostatic atomizer |
-
1986
- 1986-01-28 JP JP61016110A patent/JPS62173650A/en active Pending
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH01317237A (en) * | 1988-06-16 | 1989-12-21 | Sony Corp | Photodetecting device |
| JPH05234121A (en) * | 1992-02-24 | 1993-09-10 | Alps Electric Co Ltd | Optical head device |
| EP0713212A3 (en) * | 1994-11-17 | 1997-03-05 | Canon Kk | Optical information recording and reproducing apparatus |
| EP0745984A2 (en) * | 1995-05-31 | 1996-12-04 | Nec Corporation | Optical head apparatus |
| EP0745984A3 (en) * | 1995-05-31 | 1998-01-14 | Nec Corporation | Optical head apparatus |
| US7861954B2 (en) | 2005-07-15 | 2011-01-04 | Panasonic Electric Works Co., Ltd. | Electrostatic atomizer |
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