JPH0197415U - - Google Patents
Info
- Publication number
- JPH0197415U JPH0197415U JP19221787U JP19221787U JPH0197415U JP H0197415 U JPH0197415 U JP H0197415U JP 19221787 U JP19221787 U JP 19221787U JP 19221787 U JP19221787 U JP 19221787U JP H0197415 U JPH0197415 U JP H0197415U
- Authority
- JP
- Japan
- Prior art keywords
- light
- receiving element
- light beams
- recording medium
- split
- 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 6
- 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図は他の実施例
の特徴部分を説明するための図、第６図は第５図
の実施例を利用したトラツキングを説明するため
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、４０…４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 characteristic parts of another embodiment, and FIG. This figure is a diagram for explaining tracking using the embodiment of FIG. 5. DESCRIPTION OF SYMBOLS 10... Semiconductor laser, 20... Optical disk as an optical information recording medium, 22... Condensing lens, 24...
A prism 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, 40... a four-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分割もしくは４分割受光素子
であつて、各受光部は上記２光束の中心部を除く
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 is a two-split or four-split light-receiving element, and each light-receiving part receives a portion of the light beam other than the center of the two light beams, and adjusts the amount of light according to the amount of light received. An optical pickup that emits a photoelectric conversion signal, and generates a focus error signal using the photoelectric conversion signal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP19221787U JPH0197415U (en) | 1987-12-18 | 1987-12-18 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP19221787U JPH0197415U (en) | 1987-12-18 | 1987-12-18 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0197415U true JPH0197415U (en) | 1989-06-28 |
Family
ID=31483086
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP19221787U Pending JPH0197415U (en) | 1987-12-18 | 1987-12-18 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0197415U (en) |
-
1987
- 1987-12-18 JP JP19221787U patent/JPH0197415U/ja active Pending
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