JP2642405B2 - Optical information reproducing device - Google Patents
Optical information reproducing deviceInfo
- Publication number
- JP2642405B2 JP2642405B2 JP63117048A JP11704888A JP2642405B2 JP 2642405 B2 JP2642405 B2 JP 2642405B2 JP 63117048 A JP63117048 A JP 63117048A JP 11704888 A JP11704888 A JP 11704888A JP 2642405 B2 JP2642405 B2 JP 2642405B2
- Authority
- JP
- Japan
- Prior art keywords
- light
- receiving element
- light receiving
- light source
- 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.)
- Expired - Fee Related
Links
Landscapes
- Optical Head (AREA)
Description
【発明の詳細な説明】 〔産業上の利用分野〕 本発明は、光学式ビデオディスク、コンパクトディス
ク、或いは光ディスク等の光学的に情報が記録されてい
る情報記録媒体から、その情報を再生すべくこれを読取
る光学式情報再生装置に関する。DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention is directed to reproducing information from an information recording medium, such as an optical video disk, a compact disk, or an optical disk, on which information is optically recorded. The present invention relates to an optical information reproducing apparatus for reading the information.
従来のこの種の光学式情報再生装置の構成としては第
４図に示すものが、その半導体レーザ装置としては第５
図に示すものがあり、以下これについて説明する。FIG. 4 shows the structure of a conventional optical information reproducing apparatus of this kind, while FIG.
Some of them are shown in the figure, which will be described below.
１は半導体レーザ光源で、これより発したレーザ光は
ハーフミラー２の表面で反射され、対物レンズ３に入射
される。Reference numeral 1 denotes a semiconductor laser light source. Laser light emitted from the semiconductor laser light source is reflected by the surface of the half mirror 2 and is incident on the objective lens 3.
対物レンズ３は入射光を集束し、ディスク４に照射
し、このディスク４から反射された光は対物レンズ３、
ハーフミラー２に同じ経路を通って戻る。The objective lens 3 converges the incident light and irradiates the disk 4 with the light reflected from the disk 4.
It returns to the half mirror 2 through the same path.
ハーフミラー２の裏面で反射された光は受光素子５に
到達し、受光素子５で光電変換されてディスク４の情報
が電気信号として取り出される。The light reflected on the back surface of the half mirror 2 reaches the light receiving element 5 and is photoelectrically converted by the light receiving element 5 to extract information on the disk 4 as an electric signal.
一方、半導体レーザ光源１からは前記と反対面からも
光を発し、その光はハーフミラー２とは反対面に設置さ
れたモニタ受光素子６に入り、その出力によって負帰還
回路７が半導体レーザ光源１の出力をコントロールし、
半導体レーザ光源１の出力を一定に保つものである。On the other hand, the semiconductor laser light source 1 also emits light from the surface opposite to the above, and the light enters the monitor light receiving element 6 installed on the surface opposite to the half mirror 2, and the output thereof causes the negative feedback circuit 7 to output the semiconductor laser light source. Control the output of 1,
The output of the semiconductor laser light source 1 is kept constant.
そして、この半導体レーザ光源１は、ステム８に取付
けられているヒートシンク９のシリコン基板10に取付け
られており、又受光素子６はステム１上に設置されてい
るものである。The semiconductor laser light source 1 is mounted on a silicon substrate 10 of a heat sink 9 mounted on a stem 8, and the light receiving element 6 is mounted on the stem 1.
従来の光学式情報再生装置においては、１つのステム
８上に半導体レーザ光源１と、その後方の該半導体レー
ザ光源１からの光線が照射される受光素子６とが設けら
れている。In a conventional optical information reproducing apparatus, a semiconductor laser light source 1 and a light receiving element 6 to which a light beam from the semiconductor laser light source 1 behind is provided on one stem 8.
そして、これ等には取付部品たるヒートシンク９、リ
ードピン11等が必要であり、半導体レーザ光源１と受光
素子６との関連位置と相まって、装置が大型化する欠点
があった。In addition, these require the heat sink 9 and the lead pins 11 as attachment parts, and there is a drawback that the apparatus becomes large in size in combination with the related position of the semiconductor laser light source 1 and the light receiving element 6.
本発明は、従来の光学式情報再生装置の前述の問題点
を解消するために、ディスクの情報を読取るための第１
の受光素子と、光源の光量を一定化するために光源の出
力をコントロールするための第２の受光素子を１つの受
光素子体に形成することによって、部品点数を減じ装置
の小型化、軽量化を図り、且つ第１の受光素子に光源か
らの光線が入射し、その出力の低下、雑音の増加等の悪
影響を未然に防止することを目的とする。SUMMARY OF THE INVENTION The present invention provides a first optical information reproducing apparatus for solving the above-mentioned problems, a first optical information reproducing apparatus for reading information from a disc.
A light receiving element and a second light receiving element for controlling the output of the light source in order to stabilize the light amount of the light source are formed in one light receiving element body, thereby reducing the number of parts and reducing the size and weight of the device. It is another object of the present invention to prevent a light beam from a light source from being incident on the first light receiving element and to prevent adverse effects such as a decrease in output of the light receiving element and an increase in noise.
上記の目的を達成するために、本発明の光学式情報再
生装置においては、ディスクで反射された情報を含む光
線を受光する第１の受光素子と、光源からの光線を直線
受光してモニターする第２の受光素子とを一つの受光素
子体の両面の異なる位置に形成し、第１の受光素子の背
面には遮光部を形成したものである。In order to achieve the above object, in an optical information reproducing apparatus according to the present invention, a first light receiving element for receiving a light beam containing information reflected by a disc, and a light beam from a light source are linearly received and monitored. The second light receiving element is formed at different positions on both surfaces of one light receiving element body, and a light shielding portion is formed on the back surface of the first light receiving element.
前記のように形成された光学式情報再生装置において
は、光源から発した光線は、対物レンズを経由して集束
されてディスクを照射し、その反射によって情報を含ん
だ光線と、前記の光源から発して直接に受光素子体に到
達する光線とは、第１の受光素子の受光面、第２の受光
素子の受光面とに到達する。In the optical information reproducing apparatus formed as described above, the light beam emitted from the light source is focused through the objective lens to irradiate the disc, and the light beam containing the information by the reflection, The light beam emitted and directly reaching the light receiving element body reaches the light receiving surface of the first light receiving element and the light receiving surface of the second light receiving element.
そして、第１の受光素子で光電変換されて情報を含ん
だ光線は電気信号として、第２の受光素子で光電変換さ
れて光源の発光量のモニター信号として取り出されるも
のである。The light beam that contains information by being photoelectrically converted by the first light receiving element is taken out as an electric signal, and is photoelectrically converted by the second light receiving element, and is taken out as a monitor signal of the light emission amount of the light source.
この第１の受光素子と第２の受光素子とは、１つの受
光素子体の両面に形成することで、反対方向から来るデ
ィスクを経由した光線、しない光線の受光が可能とな
る。By forming the first light receiving element and the second light receiving element on both surfaces of one light receiving element body, it is possible to receive light beams coming from opposite directions through a disk and light beams not coming through the disk.
そして、第１の受光素子と第２の受光素子とを１つの
受光素子体の異なる位置に形成し、第１の受光素子の背
面に設けた遮光部が、第１の受光素子の背面から入射す
る光線を遮断し、その出力の低下、雑音の増加等の悪影
響を未然に防止できるものである。Then, the first light receiving element and the second light receiving element are formed at different positions of one light receiving element body, and a light shielding portion provided on the back of the first light receiving element is incident from the back of the first light receiving element. In this way, it is possible to prevent a light beam from falling, and to prevent adverse effects such as a decrease in output and an increase in noise.
次に、本発明の一実施例を、第１図〜第３図について
説明する。Next, an embodiment of the present invention will be described with reference to FIGS.
21は半導体レーザ光源で、その一面から出た光線は発
散光であるので、その一部の光線22は受光素子体23の孔
24を通り、ハーフミラー25の表面で反射され、対物レン
ズ26で集束されてディスク27を照射する。Reference numeral 21 denotes a semiconductor laser light source, and light rays emitted from one surface of the light source are divergent lights.
The light passes through 24, is reflected by the surface of the half mirror 25, is focused by the objective lens 26, and irradiates the disk 27.
そして、このディスク27で反射されることにより、デ
ィスク27上に記録されている信号を含んだ光線28は同じ
経路を戻り、ハーフミラー25の裏面で反射され、受光素
子体23の一面に形成された信号読取りパターン29を有す
る第１の受光素子PD1に到達する。Then, by being reflected on the disk 27, the light beam 28 including the signal recorded on the disk 27 returns along the same path, is reflected on the back surface of the half mirror 25, and is formed on one surface of the light receiving element body 23. signal to reach the first light receiving element PD 1 having the read pattern 29.
一方、半導体レーザ光源21の前記の面からの一部の光
線30は、受光素子体23の孔24の周囲の他面に形成された
第２の受光素子PD2に到達する。On the other hand, a part of the light rays 30 from the surface of the semiconductor laser light source 21 reaches the second light receiving element PD2 formed on the other surface around the hole 24 of the light receiving element body 23.
この受光素子体23は、その基板シリコンがＮ型領域で
あるＮ層を形成し、その２個処に通常はボロン選択拡散
によってＰ型領域となるＰ層が形成され、このＰ層とＮ
層とは接合中性層である空乏層Ｏを介してPN接合されて
いる。In the light receiving element 23, an N layer whose substrate silicon is an N type region is formed, and a P layer which is normally a P type region is formed at two places by boron selective diffusion.
The layers are PN-joined via a depletion layer O which is a junction neutral layer.
そして、２個処のＰ層のうちの１は、信号読取りパタ
ーン29を有する第１の受光素子PD1となってＰ層側が受
光面となり、孔24の周囲に形成されたＰ層は第２の受光
素子PD2となってＮ層側が受光面となる。Then, one of the two processing of the P layer, the first becomes the light receiving element PD 1 having a signal reading pattern 29 becomes P layer side light-receiving surface, P layer formed around the hole 24 and the second N layer side is a light-receiving surface becomes the light receiving element PD 2.
この受光素子体23は光が前記Ｎ層である基板シリコン
中で吸収されると、光エネルギーが価電子帯の電子を励
起し、光キャリアとして自由に動ける電子となるので、
Ｎ層をカソード、Ｐ層をアノードとすることによって、
外部回路へ信号として取り出せる。When light is absorbed in the substrate silicon, which is the N layer, light energy excites electrons in the valence band and turns into electrons that can move freely as photocarriers.
By using the N layer as a cathode and the P layer as an anode,
Can be extracted as a signal to an external circuit.
そして、受光素子体23には、第１の受光素子PD1の背
面側に遮光部31が設けられているので半導体レーザ光源
21からの光線が直接に、第１の受光素子PD1の背面に入
射することはない。The semiconductor laser light source since the light receiving element 23 is the light shielding portion 31 is provided in the first back side of the light-receiving element PD 1
The light beam from 21 does not directly enter the back surface of the first light receiving element PD1.
従って、ハーフミラー25で反射されたディスク27から
の光線28のみが第１の受光素子PD1に入射し、第１の受
光素子PD1は信号読取りパターン29に形成されているの
で、その光電変換によってディスク情報の他に、トラッ
キング情報等の電気信号として取り出される。Therefore, only the light beam 28 from the disk 27 that is reflected by the half mirror 25 is incident on the first light receiving element PD 1, since the first light receiving element PD 1 is formed in the signal reading pattern 29, the photoelectric conversion As a result, in addition to the disk information, it is extracted as an electric signal such as tracking information.
一方、第２の受光素子PD2に入射した半導体レーザ光
源21からの光線30は、入射光量、即ちその発光量の情報
として取り出され、負帰還回路によって半導体レーザ光
源21にフィードバックされ、その発光量を一定化するも
のである。On the other hand, the light beam 30 from the semiconductor laser light source 21 incident on the second light receiving element PD 2 is extracted as information on the incident light amount, that is, information on the light emission amount, and is fed back to the semiconductor laser light source 21 by a negative feedback circuit, and the light emission amount Is to be constant.
本発明は叙上のように、光源からの光線を、ディスク
を経由した情報を含む光線、光源の発光量を示す光源か
らの直接光線として、１つの受光素子体の両面に形成し
た２つの受光素子でそれぞれ受光するものである。As described above, according to the present invention, a light beam from a light source is converted into a light beam including information passing through a disc and a direct light beam from a light source indicating the light emission amount of the light source. The light is received by each element.
従って、受光素子体が１つで足りるため部品点数が少
くなると共に、省スペース化が可能であり、光学式情報
再生用ピックアップの小型、軽量化が図れる。Therefore, since only one light receiving element is required, the number of components is reduced, the space can be saved, and the size and weight of the optical information reproducing pickup can be reduced.
そして、情報を含む光線を受光する第１の受光素子の
背面には遮光部が形成されているため、光源からの直接
光、その付近の反射光等が入射することがなく、このよ
うな光線の入射による第１の受光素子の感度低下による
出力の減退、雑音の増大等を防止できるものである。Since the light-shielding portion is formed on the back surface of the first light receiving element that receives the light beam containing information, the direct light from the light source, the reflected light near the light source, and the like do not enter. Of the first light-receiving element due to the incidence of light, a decrease in output, an increase in noise, and the like can be prevented.
第１図は本発明の一実施例の構成図、 第２図はこれをハーフミラー側から見た斜面図、 第３図は受光素子体の構成図、 第４図は従来の装置の構成図、 第５図は同上の光源チップの斜面図である。 21……半導体レーザ光源、22,28,30……光線、23……受
光素子体、24……孔、25……ハーフミラー、26……対物
レンズ、27……ディスク、29……信号読取りパターン、
31……遮光部、PD1……第１の受光素子、PD2……第２の
受光素子。FIG. 1 is a structural view of an embodiment of the present invention, FIG. 2 is a perspective view of the same as viewed from a half mirror side, FIG. 3 is a structural view of a light receiving element body, and FIG. FIG. 5 is a perspective view of the light source chip. 21 ... Semiconductor laser light source, 22, 28, 30 ... Light beam, 23 ... Light receiving element, 24 ... Hole, 25 ... Half mirror, 26 ... Objective lens, 27 ... Disk, 29 ... Signal reading pattern,
31: light-shielding section, PD 1 ... first light-receiving element, PD 2 ... second light-receiving element.
Claims (1)
と、該光源からの光線をディスクに集束して照射する対
物レンズと、ディスクを経由した光線を受光してこれを
電気信号に光電変換する第１の受光素子、及び前記光源
からの光線をディスクを経由しないで受光してその受光
量を光電変換し、光源の発光量をコントロールする第２
の受光素子とを両面の異なる位置に形成した受光素子体
と、前記第１の受光素子の背面に設けた遮光部とを備え
たことを特徴とする光学式情報再生装置。1. A light source for emitting light for reproducing information, an objective lens for converging and irradiating light from the light source onto a disk, and receiving a light passing through the disk and photoelectrically converting the light into an electric signal. A first light receiving element for receiving light rays from the light source without passing through a disk, and photoelectrically converting the received light amount to control the light emission amount of the light source.
An optical information reproducing apparatus, comprising: a light receiving element body having light receiving elements formed at different positions on both surfaces thereof; and a light shielding portion provided on a back surface of the first light receiving element.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63117048A JP2642405B2 (en) | 1988-05-16 | 1988-05-16 | Optical information reproducing device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63117048A JP2642405B2 (en) | 1988-05-16 | 1988-05-16 | Optical information reproducing device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH01287832A JPH01287832A (en) | 1989-11-20 |
| JP2642405B2 true JP2642405B2 (en) | 1997-08-20 |
Family
ID=14702137
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP63117048A Expired - Fee Related JP2642405B2 (en) | 1988-05-16 | 1988-05-16 | Optical information reproducing device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2642405B2 (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2005327363A (en) * | 2004-05-13 | 2005-11-24 | Sharp Corp | Compound optical element, optical integrated unit, and optical pickup apparatus |
| JP2007220216A (en) * | 2006-02-16 | 2007-08-30 | Sony Corp | Optical integrated element, optical pickup device, and optical disk device |
-
1988
- 1988-05-16 JP JP63117048A patent/JP2642405B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH01287832A (en) | 1989-11-20 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| LAPS | Cancellation because of no payment of annual fees |