JPH0197416U - - Google Patents
Info
- Publication number
- JPH0197416U JPH0197416U JP19221887U JP19221887U JPH0197416U JP H0197416 U JPH0197416 U JP H0197416U JP 19221887 U JP19221887 U JP 19221887U JP 19221887 U JP19221887 U JP 19221887U JP H0197416 U JPH0197416 U JP H0197416U
- Authority
- JP
- Japan
- Prior art keywords
- light
- light beams
- recording medium
- photoelectric conversion
- receiving element
- 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 claims description 7
- 230000004075 alteration Effects 0.000 claims description 3
- 238000006243 chemical reaction Methods 0.000 claims 2
- 201000009310 astigmatism Diseases 0.000 claims 1
- 238000005286 illumination Methods 0.000 claims 1
- 238000010586 diagram Methods 0.000 description 7
- 230000000694 effects Effects 0.000 description 1
- 239000004065 semiconductor Substances 0.000 description 1
Landscapes
- Optical Recording Or Reproduction (AREA)
Description
第１図は本考案の１実施例を要部のみ略示する
図、第２図は上記実施例におけるフオーカシング
を説明するための図、第３図は別実施例を特徴部
分のみ略示する図、第４図は第３図の実施例にお
いて分離手段と収差発生手段とを兼ねるホログラ
ム素子を説明するための図、第５図は本考案の効
果を説明するための図、第６図は従来技術の問題
点を説明するための図である。
１０…半導体レーザー、２０…光情報記録媒体
としての光デイスク、２２…集光レンズ、２４…
分離手段としてのプリズム、２６，２８…集光レ
ンズとともに収差発生手段を構成するシリンダー
レンズ、３０…２分割の受光素子。
Fig. 1 is a diagram schematically showing only the main parts of one embodiment of the present invention, Fig. 2 is a diagram for explaining focusing in the above embodiment, and Fig. 3 is a diagram schematically showing only the characteristic parts of another embodiment. , FIG. 4 is a diagram for explaining the hologram element that serves as both the separating means and the aberration generating means in the embodiment of FIG. 3, FIG. 5 is a diagram for explaining the effect of the present invention, and FIG. 6 is a diagram for explaining the conventional FIG. 2 is a diagram for explaining a technical problem. DESCRIPTION OF SYMBOLS 10... Semiconductor laser, 20... Optical disk as an optical information recording medium, 22... Condensing lens, 24...
A prism serving as a separating means, 26, 28...a cylinder lens which constitutes an aberration generating means together with a condensing lens, 30...a two-divided light receiving element.
Claims (1)
再生を行う光ピツクアツプであつて、 光情報記録媒体による反射光が照明用光路から
分離した後、上記反射光を２光束に分離する分離
手段と、 この分離手段により分離した２光束に、互いに
直交する方向の非点収差を発生させる収差発生手
段と、 この収差発生手段により非点収差の発生した２
光束をそれぞれ受光する受光素子とを有し、 上記受光素子は２つの受光部を持ち、各受光部
は上記２光束の中心部を含む片側光束部分を受光
して受光量に応じた光電変換信号を発するもので
あり、 上記光電変換信号を用いて焦点誤差信号を発生
させることを特徴とする光ピツクアツプ。[Scope of Claim for Utility Model Registration] An optical pickup for recording and/or reproducing information on an optical information recording medium, wherein after the reflected light from the optical information recording medium is separated from the illumination optical path, the reflected light is a separating means for separating into two light beams; an aberration generating means for generating astigmatism in directions orthogonal to each other in the two light beams separated by the separating means;
and a light-receiving element that receives each of the light beams, and the light-receiving element has two light-receiving sections, and each light-receiving section receives a portion of the light beam on one side including the center of the two light beams, and generates a photoelectric conversion signal according to the amount of received light. What is claimed is: 1. An optical pickup, characterized in that the photoelectric conversion signal is used to generate a focus error signal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP19221887U JPH0197416U (en) | 1987-12-18 | 1987-12-18 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP19221887U JPH0197416U (en) | 1987-12-18 | 1987-12-18 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0197416U true JPH0197416U (en) | 1989-06-28 |
Family
ID=31483087
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP19221887U Pending JPH0197416U (en) | 1987-12-18 | 1987-12-18 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0197416U (en) |
-
1987
- 1987-12-18 JP JP19221887U patent/JPH0197416U/ja active Pending
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