JPH0216417U - - Google Patents
Info
- Publication number
- JPH0216417U JPH0216417U JP9213488U JP9213488U JPH0216417U JP H0216417 U JPH0216417 U JP H0216417U JP 9213488 U JP9213488 U JP 9213488U JP 9213488 U JP9213488 U JP 9213488U JP H0216417 U JPH0216417 U JP H0216417U
- Authority
- JP
- Japan
- Prior art keywords
- receiving element
- light receiving
- light
- condensing point
- luminous flux
- 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 4
- 230000004907 flux Effects 0.000 claims 2
- 238000006243 chemical reaction Methods 0.000 claims 1
- 238000010586 diagram Methods 0.000 description 3
- 239000006059 cover glass Substances 0.000 description 1
- 239000004065 semiconductor Substances 0.000 description 1
Landscapes
- Optical Head (AREA)
- Optical Recording Or Reproduction (AREA)
Description
第１図は本考案の一実施例における自動焦点調
整装置を表わした構成説明図、第２図および第３
図は受光素子の構成を表わした断面説明図および
平面説明図、第４図ａ，ｂ，ｃは受光素子面上の
スポツト径変化を表わした平面説明図、第５図は
本考案の他の実施例における自動焦点調整装置を
表わした構成説明図、第６図は従来における自動
焦点調整装置を表わした構成説明図である。
２１……半導体レーザー、２６……光デイスク
、２７，３７……集光レンズ、２８……第１受光
素子、２８ｂ……受光部、２８ｃ……ハーフミラ
ーカバーガラス、２９……第２受光素子。
FIG. 1 is a configuration explanatory diagram showing an automatic focus adjustment device in one embodiment of the present invention, and FIGS.
The figures are cross-sectional and plan explanatory views showing the configuration of the light-receiving element, Figures 4 a, b, and c are plan views showing changes in spot diameter on the light-receiving element surface, and Figure 5 is a plan view showing the structure of the light-receiving element. FIG. 6 is a diagram illustrating the configuration of an automatic focus adjustment device according to an embodiment, and FIG. 6 is a diagram illustrating a configuration of a conventional automatic focus adjustment device. 21... Semiconductor laser, 26... Optical disk, 27, 37... Condensing lens, 28... First light receiving element, 28b... Light receiving section, 28c... Half mirror cover glass, 29... Second light receiving element .
Claims (1)
り一定の集光点に収束させるともに、上記集光点
の前領域および後領域に第１受光素子および第２
受光素子をそれぞれ配置し、これら第１受光素子
および第２受光素子に上記収束光を照射してそれ
ぞれから発せられる各光電変換信号の差分をとり
、焦点制御動作用の焦点誤差信号を得るようにし
た光ピツクアツプの自動焦点調整装置において、
上記２つの受光素子のうちの集光点の前領域に配
置された第１受光素子は、該第１受光素子に対す
る照射光の約半分の光束を入射させかつ残りの約
半分の光束を集光点の後領域に配置された第２受
光素子へ向かつて反射させる入射面を備えてなる
ことを特徴とする光ピツクアツプの自動焦点調整
装置。 The reflected light from the optical information recording medium is converged to a certain condensing point by a condensing lens, and a first light receiving element and a second light receiving element are provided in front and rear regions of the condensing point.
A light receiving element is arranged respectively, the first light receiving element and the second light receiving element are irradiated with the convergent light, and a difference between each photoelectric conversion signal emitted from each is taken to obtain a focus error signal for a focus control operation. In the automatic focus adjustment device of the optical pickup,
Of the two light receiving elements, the first light receiving element disposed in the front region of the condensing point allows approximately half of the luminous flux of the irradiation light to be incident on the first light receiving element, and condenses the remaining approximately half of the luminous flux. 1. An automatic focusing device for an optical pickup, comprising an incident surface that reflects light toward a second light-receiving element disposed in a region behind the point.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP9213488U JPH0216417U (en) | 1988-07-12 | 1988-07-12 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP9213488U JPH0216417U (en) | 1988-07-12 | 1988-07-12 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0216417U true JPH0216417U (en) | 1990-02-01 |
Family
ID=31316589
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP9213488U Pending JPH0216417U (en) | 1988-07-12 | 1988-07-12 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0216417U (en) |
-
1988
- 1988-07-12 JP JP9213488U patent/JPH0216417U/ja active Pending
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