JPH01220142A - Optical information reproducing device - Google Patents
Optical information reproducing deviceInfo
- Publication number
- JPH01220142A JPH01220142A JP63044198A JP4419888A JPH01220142A JP H01220142 A JPH01220142 A JP H01220142A JP 63044198 A JP63044198 A JP 63044198A JP 4419888 A JP4419888 A JP 4419888A JP H01220142 A JPH01220142 A JP H01220142A
- 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.)
- Granted
Links
- 230000003287 optical effect Effects 0.000 title claims description 13
- 239000004065 semiconductor Substances 0.000 abstract description 25
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 abstract description 6
- 229910052710 silicon Inorganic materials 0.000 abstract description 6
- 239000010703 silicon Substances 0.000 abstract description 6
- 239000000758 substrate Substances 0.000 abstract description 6
- 238000010586 diagram Methods 0.000 description 8
- ZOXJGFHDIHLPTG-UHFFFAOYSA-N Boron Chemical compound [B] ZOXJGFHDIHLPTG-UHFFFAOYSA-N 0.000 description 1
- 229910052796 boron Inorganic materials 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 238000009792 diffusion process Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000002452 interceptive effect Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 230000007935 neutral effect Effects 0.000 description 1
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Abstract
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 a method for reproducing information from an information recording medium on which information is optically recorded, such as an optical video disc, a compact disc, or an optical disc. The present invention relates to an optical information reproducing device for reading this 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
１０図に示すものが、その半導体レーザ装置としては第
１１図に示すものがあり、以下これについて説明する。The configuration of a conventional optical information reproducing device of this type is shown in FIG. 10, and the semiconductor laser device thereof is shown in FIG. 11, which will be described below.
１は半導体レーザ光源で、これより発したレ−ザ光はハ
ーフミラ−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, and the laser light emitted from this is reflected on the surface of a half mirror 2 and enters an 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−２に同じ経路を通って戻る。The objective lens 3 focuses the incident light and irradiates it onto the disk 4,
The light reflected from the disk 4 returns to the objective lens 3 and half mirror 2 through the same path.
ハーフミラ−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, where it is photoelectrically converted and the information on the disk 4 is extracted as an electrical 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−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 opposite surface, and the light enters the monitor light receiving element 6 installed on the opposite surface of the half mirror 2, and the negative feedback circuit 7 is activated by the output from the semiconductor laser light source. 1 and keeps the output of the semiconductor laser light source 1 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 attached to a silicon substrate 10 of a heat sink 9 attached to a stem 8, and the light receiving element 6 is placed 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ａ！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 device, one stem 8
The semiconductor laser light source 1 is on the top, and the semiconductor laser light a! is behind it. A light receiving element 6 is provided to which the light beam from 1 is irradiated.
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。These require attachment parts such as a heat sink 9 and lead pins 11, which, together with the relative positions of the semiconductor laser light source 1 and the light receiving element 6, has the drawback of increasing the size of the device.
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、軽量化を図ることを目的とする。In order to solve the above-mentioned problems of conventional optical information reproducing devices, the present invention provides a first light receiving element for reading information on a disc, and a control for controlling the output of a light source to constantize the amount of light from the light source. It is an object of the present invention to reduce the number of parts and reduce the size and weight of the device by forming a second light-receiving element in one light-receiving element body.
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、光源の一面から発した光線を対物レン
ズによって集束してディスク面に照射し、このディスク
を経由した光線を受光する第１の受光素子が受光素子体
の一部に形成され、光源の他面から発し、ディスクを経
由しない光線を受光する第２の受光素子を前記の受光素
子体の他の部分に形成したものである。In order to achieve the above object, in the optical information reproducing apparatus of the present invention, a light beam emitted from one surface of a light source is focused by an objective lens and irradiated onto a disk surface, and a second lens that receives the light beam passing through the disk is provided. A first light receiving element is formed in a part of the light receiving element body, and a second light receiving element for receiving light rays emitted from the other surface of the light source and not passing through the disk is formed in another part of the light receiving element body. be.
そして、第１の受光素子と第２の受光素子との間に、光
線を遮断する遮蔽板を設けることが望ましい。Further, it is desirable to provide a shielding plate that blocks light rays between the first light receiving element and the second light receiving element.
又、前記光源の他面から発してディスクを経由しない光
線をミラー等で反射させ、第１の受光素子の受光面とは
反対面に形成された第２の受光素子の受光面に入射させ
るようにしてもよい。Further, the light beam emitted from the other surface of the light source and not passing through the disk is reflected by a mirror or the like, and is made to enter the light receiving surface of the second light receiving element formed on the opposite surface to the light receiving surface of the first light receiving element. You may also do so.
更に、第１の受光素子の受光面とは反対面を受光面とす
る第２の受光素子に、ディスクを照射する光源の発光面
からの光線を併せて入射させることもできるものである
。Furthermore, the light rays from the light emitting surface of the light source that illuminates the disc can also be made to enter a second light receiving element whose light receiving surface is opposite to the light receiving surface of the first light receiving element.
前記のように構成された光学式情報再生装置においては
、光源の一面から発した光線は、対物レンズを通ること
で集束されてディスクに照射され、これを経由した光線
と、光源の他面から発し、ディスクを経由しない光線と
は、受光素子体の２個所に形成された第１．第２の受光
素子によって受光される。In the optical information reproducing device configured as described above, the light beam emitted from one side of the light source is focused by passing through the objective lens and irradiated onto the disk, and the light beam that passes through this and the light beam from the other side of the light source are combined. The light rays that are emitted and do not pass through the disk are the first rays formed at two locations on the light receiving element body. The light is received by the second light receiving element.
第１の受光素子は、ディスクを経由した光線を光電変換
してディスクの情報を電気信号に変え、第２の受光素子
はディスクを経由しない光線を光電変換し、光源の発光
をコントロールする電気信号とするものである。The first light-receiving element photoelectrically converts the light beam that has passed through the disk, converting the information on the disk into an electrical signal, and the second light-receiving element photoelectrically converts the light beam that does not pass through the disk, and generates an electric signal that controls the light emission of the light source. That is.
前記の光学式情報再生装置において、第１の受光素子と
第２の受光素子の間に設けた遮蔽板によって、それぞれ
に入射する光線が他方の光線の干渉、一部の入射を防止
する。In the above-mentioned optical information reproducing device, the shielding plate provided between the first light receiving element and the second light receiving element prevents the light rays incident on each from interfering with the other light ray and preventing a portion of the light from entering.
又、光源の他面から発した光線をミラー等で反射させ、
第１の受光素子の受光面とは反対面の第２の受光素子の
受光面に入射させることもできる。Also, the light rays emitted from the other side of the light source are reflected by a mirror, etc.
The light can also be made incident on the light-receiving surface of the second light-receiving element, which is the opposite surface to the light-receiving surface of the first light-receiving element.
この第２の受光素子の受光面に、光源の他面から発し、
ミラー等で反射された光線と共に、光源の−面ら発した
光源の一部を入射させ、その受光量を増大することがで
きるものである。On the light receiving surface of this second light receiving element, light is emitted from the other surface of the light source,
By allowing a portion of the light emitted from the other side of the light source to enter the light source along with the light rays reflected by a mirror or the like, the amount of light received can be increased.
次に、本発明の一実施例を、第１図について説明する。 Next, one embodiment of the present invention will be described with reference to FIG.
２１はステム２２に取付けられているヒートシンク２３
に、シリコン基板２４を介して取付けられた半導体レー
ザ光源で、この半導体レーザ光源２１は前面と後面から
それぞれ放射状に光線２５゜２６を発光している。21 is a heat sink 23 attached to the stem 22
A semiconductor laser light source is attached via a silicon substrate 24, and this semiconductor laser light source 21 emits light beams 25° and 26 radially from the front and rear surfaces, respectively.
前記のステム２２には、受光素子体２７が取り付けられ
ているが、この受光素子体２７は、第２図に示すように
その基板シリコンがＮ型領域であるＮ層を形成し、その
−面の２個所に、通常はボロン選択拡散によってＰ壁領
域であるＰ層が形成されている。A light-receiving element body 27 is attached to the stem 22, and as shown in FIG. A P layer, which is a P wall region, is usually formed at two locations by selective boron diffusion.
このＰ層とＮ層とは中性接合層である空乏層Ｏを介して
ＰＮ接合されているもので、２個所のＰ層によって第１
の受光素子ＰＤ、と第２の受光素子ＰＤ、とが同一面を
受光面として形成される。The P layer and the N layer are PN-junctioned via a depletion layer O, which is a neutral junction layer, and the two P layers connect the first
The light receiving element PD and the second light receiving element PD are formed with the same surface as a light receiving surface.
この受光素子体２７は光が前記の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
、光を光電変換して電気信号として外部に取り出すこと
ができるものである。When light is absorbed in the silicon substrate, which is the N layer, the light energy excites the electrons in the valence band and becomes electrons that can move freely as photocarriers. By using the P layer as an anode, light can be photoelectrically converted and extracted as an electric signal to the outside.
一方、半導体レーザ光源２１の前面から出た光線２５は
ハーフミラ−２８の表面で反射され、対物レンズ２９で
集束されてディスク３０を照射する。On the other hand, the light beam 25 emitted from the front surface of the semiconductor laser light source 21 is reflected by the surface of the half mirror 28, focused by the objective lens 29, and illuminates the disk 30.
そして、ディスク３０で反射された光線は、逆の経路を
通り、ハーフミラ−２８に至るが、その裏面で反射され
た光線３１は凹レンズ３２を通ることによって焦点位置
が延ばされ、受光素子体２７の第１の受光素子ＰＤ、上
にディスク３０の信号の像を作る。The light beam reflected by the disk 30 passes through the opposite path and reaches the half mirror 28. However, the light beam 31 reflected by the back surface of the disk passes through the concave lens 32, so that the focal position is extended, and the light receiving element body 27 An image of the signal from the disk 30 is formed on the first light receiving element PD.
従って、第１の受光素子ＰＤ、によって光電変換され、
ディスクの情報を電気信号として取り出すことができる
。Therefore, photoelectric conversion is performed by the first photodetector PD,
Information on the disc can be extracted as electrical signals.
又、半導体レーザ光源２１の後面から発した光線２６は
受光素子体２７の第２の受光素子ＰＤ。Further, the light beam 26 emitted from the rear surface of the semiconductor laser light source 21 is transmitted to the second light receiving element PD of the light receiving element body 27.
に至り、これにより第２の受光素子ＰＤ、の受光量が光
電変換され、受光量に該当する電気信号として取り出す
ことができる。As a result, the amount of light received by the second light receiving element PD is photoelectrically converted, and can be extracted as an electrical signal corresponding to the amount of light received.
従って、この電気信号を図示しない負帰還回路によって
半導体レーザ光源２１の出力を制御する回路にフィード
バックし、半導体レーザ光源２１の出力を一定とするこ
とができる。Therefore, this electric signal is fed back to a circuit that controls the output of the semiconductor laser light source 21 by a negative feedback circuit (not shown), so that the output of the semiconductor laser light source 21 can be kept constant.
この実施画において、ステム２２、ヒートシンク２３は
受光素子体２７の部分を除いて、非反射面となるような
処理、例えば黒色塗装が施され、これ等の部分の反射が
第１の受光素子ＰＤ、、第２の受光素子ＰＤｚに入射す
る光線２６．３１と干渉したり、入射光量を狂わせたり
するの防止する。In this example, the stem 22 and the heat sink 23 are treated to become non-reflective surfaces, for example, painted black, except for the portion of the light receiving element body 27, and the reflection from these portions is reflected by the first light receiving element PD. ,, to prevent interference with the light rays 26, 31 incident on the second light receiving element PDz and to prevent the amount of incident light from being disturbed.
第３図に示す他の実施例は、受光素子体２７の第１の受
光素子ＰＤ＋ と第２の受光素子ＰＤ、の間に、光線を
遮断する遮蔽板３３を設けたものである。In another embodiment shown in FIG. 3, a shielding plate 33 is provided between the first light receiving element PD+ and the second light receiving element PD of the light receiving element body 27 to block the light beam.
この遮蔽板３３は、第１の受光素子ＰＤ＋に半導体レー
ザ光源２１の裏面からの光線２６が入射し、光線３１の
持つ信号レベルの比率を悪化させ、或いは光線２６．３
１の干渉を防止するものである。This shielding plate 33 prevents the light ray 26 from the back surface of the semiconductor laser light source 21 from entering the first light receiving element PD+, worsening the signal level ratio of the light ray 31, or causing the light ray 26.3 to enter the first light receiving element PD+.
This is to prevent the interference of 1.
次に、本発明の第３の実施例を第４図について説明する
。Next, a third embodiment of the present invention will be described with reference to FIG.
この実施例においては、第１の実施例の受光素子体２７
の第２の受光素子ＰＤｚの受光面が逆の面になっており
、ステム２２から離れた場所に設置されている。In this embodiment, the light receiving element body 27 of the first embodiment is
The light-receiving surface of the second light-receiving element PDz is the opposite surface, and is installed at a location away from the stem 22.
そして、ステム２２には、半導体レーザ光源２１の後面
から発した光線２６が第２の受光素子ＰＤ２を照射する
ようにミラー３４が設けられている。ミラー３４は、光
線２６が第２の受光素子ＰＤ２に入射し易い様に適当な
傾斜をもってステム２２に取付けるのが好ましく、この
ことは、半導体レーザ光源２１への、光線２６の反射を
防ぐためにも有効である。A mirror 34 is provided on the stem 22 so that the light beam 26 emitted from the rear surface of the semiconductor laser light source 21 irradiates the second light receiving element PD2. It is preferable that the mirror 34 be attached to the stem 22 with an appropriate inclination so that the light beam 26 can easily enter the second light receiving element PD2. It is valid.
従って、ハーフミラ−２８の裏面で反射されたディスク
３０を経由した光線３１は、凹レンズ３２を通って第１
の受光素子ＰＤ＋を照射し、半導体レーザ光源２１の後
面からの光線２６は第２の受光素子ＰＤｚを照射する。Therefore, the light ray 31 that is reflected on the back surface of the half mirror 28 and passes through the disk 30 passes through the concave lens 32 and passes through the first
A light beam 26 from the rear surface of the semiconductor laser light source 21 illuminates the second light receiving element PDz.
その他の点については、第１の実施例と変るものではな
い。Other points are the same as the first embodiment.
更に、第５図に示す第４実施例は、第４図の第３実施例
に比して、受光素子体２７をハーフミラ−２８に近づけ
、第１の受光素子ＰＤ、に凹レンズ３２を使用すること
なく、ディスク３０の像を結ばせることができるように
する。Furthermore, in the fourth embodiment shown in FIG. 5, compared to the third embodiment shown in FIG. 4, the light receiving element body 27 is brought closer to the half mirror 28, and a concave lens 32 is used for the first light receiving element PD. To make it possible to form an image of a disk 30 without causing any problems.
一方、半導体レーザ光源２１の後面から発し、ミラー３
４で反射された光線２６と共に、半導体レーザ光源２１
の前面からの光線２５の一部が第２の受光素子ＰＤ、を
照射するようにしたものである。On the other hand, the semiconductor laser light source 21 emits light from the rear surface of the mirror 3.
4 together with the light beam 26 reflected by the semiconductor laser light source 21
A part of the light beam 25 from the front surface of the photodetector irradiates the second light receiving element PD.
そのため、第２の受光素子ＰＤ、の受光量が増加させる
ことができ、安定した受光量信号が得られるものである
。Therefore, the amount of light received by the second light receiving element PD can be increased, and a stable received light amount signal can be obtained.
第６図〜第８図の第５実施例においては、受光素子体２
７にディスク３０を照射する光線２５の通路となる孔３
５を形成し、その周囲に第２の受光素子ＰＤ、となるＰ
層を形成する。In the fifth embodiment shown in FIGS. 6 to 8, the light receiving element body 2
Hole 3 serves as a passage for the light beam 25 that illuminates the disk 30 at 7.
5, and a second photodetector PD is formed around it.
form a layer.
そして、ステム２２に形成するミラーは凹面鏡３６とし
、半導体レーザ光源２１の後面から発した光線２６を前
記第２の受光素子ＰＤ２に集束する。The mirror formed on the stem 22 is a concave mirror 36, and the light beam 26 emitted from the rear surface of the semiconductor laser light source 21 is focused on the second light receiving element PD2.
又、半導体レーザ光源２１を取付けているヒートシンク
２３には凹面鏡３６の面に突出する突部３７が形成され
、凹面鏡３６で反射された光線が半導体レーザ光源２１
に戻らないようにするもので、これにより戻り光線によ
るノイズが軽減される。Further, the heat sink 23 to which the semiconductor laser light source 21 is attached is formed with a protrusion 37 that protrudes from the surface of the concave mirror 36, so that the light beam reflected by the concave mirror 36 is directed to the semiconductor laser light source 21.
This reduces the noise caused by the returning light beam.
〔発明の効果〕
本発明は膜上のように、１つの受光素子体の２部分に、
第１の受光素子と第２の受光素子を形成し、光源の一面
から発した光線をディスクを経由した光線として第１の
受光素子で受光し、他面から発した光線をディスクを経
由しない光線として受光するものである。[Effects of the Invention] The present invention provides two parts of one light-receiving element body, such as on a film.
A first light-receiving element and a second light-receiving element are formed, and the first light-receiving element receives the light beam emitted from one side of the light source as a light beam that has passed through the disk, and the light beam emitted from the other side is received by the first light-receiving element as a light beam that does not go through the disk. It receives light as .
従って、従来の各独立していた２つの受光素子を１つの
受光素子体としてまとめることができるので、部品点数
の削減と、省スペースが図られ、装置を小型化、軽量す
ることができる。Therefore, since the conventional two independent light receiving elements can be combined into one light receiving element body, the number of parts and space can be reduced, and the device can be made smaller and lighter.
又、第１の受光素子と第２の受光素子との間に設けた光
を遮断する遮光板によって、他方への入射を必要とする
光線の一部が入射し、ノイズとなったり、信号レベルを
低めたりすることがない。In addition, because of the light shielding plate provided between the first light receiving element and the second light receiving element, a part of the light beam that needs to be incident on the other side may enter, causing noise or lowering the signal level. I never lower it.
更に、第１の受光素子と第２の受光素子の受光面を反対
面とすることによって、これ等に入射する光線の方向を
逆にすることができ、従ってこれ等の光線の干渉による
ノイズの発生、信号レベルの低下を防止することができ
る。Furthermore, by making the light-receiving surfaces of the first light-receiving element and the second light-receiving element opposite, the direction of the light rays incident on them can be reversed, thereby reducing noise caused by interference between these light rays. This can prevent the signal level from decreasing.
しかも、第２の受光素子に入射する光線を、光源の他面
から発した光線ばかりでなく、−面からの光線をも入射
させることによって、入力光のパワーの増大、Ｓ／Ｎレ
ベルの向上が図られ、光源の出力のコントロールが容易
となるものである。Moreover, by making the light rays incident on the second light receiving element not only the light rays emitted from the other surface of the light source but also the light rays from the negative surface, the power of the input light is increased and the S/N level is improved. This makes it easier to control the output of the light source.
第１図は本発明の一実施例の構成図、
第２図はその発光素子体の構成図、
第３図は本発明の第２実施例の構成図、第４図は本発明
の第３実施例の構成図、第５図は本発明の第４実施例の
構成図、第６図は本発明の第５実施例の構成図、第７図
はその光源体の斜面図、
第８図は第７図の平面図、
第９図は凹面鏡部分の拡大斜面図、
第１０図は従来の装置の構成図、
第１１図は同上の光源体の斜１面図である。
２１・・・半導体レーザ光源、２２・・・ステム、２３
・・・ヒートシンク、２４・・・シリコン基板、２５，
２６．３１・・・光線、２７・・・受光素子体、２８・
・・ハーフミラ−１２９・・・対物レンズ、３０・・・
ディスク、３２・・・凹レンズ、３３・・・遮蔽板、３
４・・・ミラー、３５・・・孔、３６・・・凹面鏡、３
７・・・突部。
第１図
第３図
第７図
第８図
第９０Fig. 1 is a block diagram of an embodiment of the present invention, Fig. 2 is a block diagram of its light emitting element body, Fig. 3 is a block diagram of a second embodiment of the present invention, and Fig. 4 is a block diagram of a third embodiment of the present invention. 5 is a block diagram of the fourth embodiment of the present invention, FIG. 6 is a block diagram of the fifth embodiment of the present invention, FIG. 7 is a perspective view of the light source, and FIG. 8 is a block diagram of the embodiment. is a plan view of FIG. 7, FIG. 9 is an enlarged oblique view of the concave mirror portion, FIG. 10 is a configuration diagram of a conventional device, and FIG. 11 is an oblique one-sided view of the light source body. 21... Semiconductor laser light source, 22... Stem, 23
... heat sink, 24 ... silicon substrate, 25,
26.31...Light ray, 27...Light receiving element body, 28.
...Half mirror-129...Objective lens, 30...
Disk, 32... Concave lens, 33... Shielding plate, 3
4... Mirror, 35... Hole, 36... Concave mirror, 3
7... Protrusion. Figure 1 Figure 3 Figure 7 Figure 8 Figure 90
Claims (4)
源の一面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、受光素子体の一部に形成され、ディスクを経
由した光線を受光し、これを情報の電気信号に光電変換
する第１の受光素子と、前記受光素子体の他の部分に形
成され、前記光源の他面からの光線を、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の受光素子とを備えたこと
を特徴とする光学式情報再生装置。(1) A light source that emits a light beam for reproducing information, an objective lens that focuses the light beam from one side of the light source onto a disk, and a light receiving element that is formed in a part of the light receiving element body and that collects the light beam that passes through the disk. a first light-receiving element that receives light and photoelectrically converts it into an information electric signal; and a first light-receiving element that is formed in another part of the light-receiving element body and receives light from the other surface of the light source without passing through the disk. , and a second light-receiving element that photoelectrically converts the amount of received light and controls the amount of light emitted from the light source.
と共に、第１の受光素子と第２の受光素子を前記受光素
子体の両面に形成したことを特徴とする請求項１項記載
の光学式情報再生装置。(2) A surface that reflects light from the other surface of the light source is provided, and a first light receiving element and a second light receiving element are formed on both sides of the light receiving element body. optical information reproducing device.
光線を遮蔽する遮蔽板を設けたことを特徴とする請求項
１項記載の光学式情報再生装置。(3) between the first light receiving element and the second light receiving element;
2. The optical information reproducing apparatus according to claim 1, further comprising a shielding plate for shielding light rays.
この光源の一面からの光線を併せて照射することを特徴
とする請求項２項記載の光学式情報再生装置。(4) a light beam from the other surface of the light source to the second light receiving element;
3. The optical information reproducing apparatus according to claim 2, wherein the light beam from one side of the light source is also irradiated.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63044198A JPH0827953B2 (en) | 1988-02-29 | 1988-02-29 | Optical information reproducing device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63044198A JPH0827953B2 (en) | 1988-02-29 | 1988-02-29 | Optical information reproducing device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH01220142A true JPH01220142A (en) | 1989-09-01 |
| JPH0827953B2 JPH0827953B2 (en) | 1996-03-21 |
Family
ID=12684874
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP63044198A Expired - Lifetime JPH0827953B2 (en) | 1988-02-29 | 1988-02-29 | Optical information reproducing device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0827953B2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5300419A (en) * | 1991-05-28 | 1994-04-05 | Fuji Photo Film Co., Ltd. | Silver halide color photographic material |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS61122945A (en) * | 1984-11-20 | 1986-06-10 | Konishiroku Photo Ind Co Ltd | Optical information reading device |
| JPS62126376A (en) * | 1985-11-28 | 1987-06-08 | Toshiba Corp | Reflection type optical coupling element |
-
1988
- 1988-02-29 JP JP63044198A patent/JPH0827953B2/en not_active Expired - Lifetime
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS61122945A (en) * | 1984-11-20 | 1986-06-10 | Konishiroku Photo Ind Co Ltd | Optical information reading device |
| JPS62126376A (en) * | 1985-11-28 | 1987-06-08 | Toshiba Corp | Reflection type optical coupling element |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5300419A (en) * | 1991-05-28 | 1994-04-05 | Fuji Photo Film Co., Ltd. | Silver halide color photographic material |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0827953B2 (en) | 1996-03-21 |
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