JPH0320034U - - Google Patents
Info
- Publication number
- JPH0320034U JPH0320034U JP7800489U JP7800489U JPH0320034U JP H0320034 U JPH0320034 U JP H0320034U JP 7800489 U JP7800489 U JP 7800489U JP 7800489 U JP7800489 U JP 7800489U JP H0320034 U JPH0320034 U JP H0320034U
- Authority
- JP
- Japan
- Prior art keywords
- light
- output
- photodetector
- polarizing filter
- irradiation device
- 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
- 238000012544 monitoring process Methods 0.000 claims description 3
- 230000003287 optical effect Effects 0.000 description 4
- 238000010586 diagram Methods 0.000 description 1
Landscapes
- Optical Head (AREA)
Description
第１図は本考案の一実施例を示す光ヘツドの光
学部分の斜視図、第２図は偏光フイルタ２８の回
転位置と、光検出器２９の出力信号レベルの関係
を示すグラフ、第３図は従来の光ヘツドの光学部
分の斜視図、第４図はＡＰＣ回路の基本ブロツク
図を示す。
２１……レーザ、２５……記録体（対象物）、
２８……偏光フイルタ、２９……光検出器、Ｂ１
……レーザ出射ビーム、Ｂ３……モニタ用ビーム
。
FIG. 1 is a perspective view of the optical part of an optical head showing an embodiment of the present invention, FIG. 2 is a graph showing the relationship between the rotational position of the polarizing filter 28 and the output signal level of the photodetector 29, and FIG. 3 4 is a perspective view of the optical part of a conventional optical head, and FIG. 4 is a basic block diagram of an APC circuit. 21... Laser, 25... Recording body (object),
28...Polarizing filter, 29...Photodetector, B 1
...Laser emission beam, B3 ...beam for monitoring.
Claims (1)
に照射する光照射装置において、 上記出射ビームから分岐されたモニタ用ビーム
の光量を検出する光検出器と、該光検出器の出力
に基づき、上記レーザ光源の出力を制御する出力
制御手段と、上記モニタ用ビームの光路中であつ
て、上記光検出器より光源側においてモニタ用ビ
ームの光軸を略中心として回動可能に設けた偏光
フイルターとを備え、上記偏光フイルターを回動
することにより、上記光検出器に入射されるモニ
タ用ビームの光量を調整する様にしたことを特徴
とする光照射装置。[Scope of Claim for Utility Model Registration] A light irradiation device that irradiates a target with a light beam emitted from a laser light source, including a photodetector that detects the amount of light of a monitoring beam branched from the emitted beam; output control means for controlling the output of the laser light source based on the output of the detector; A light irradiation device comprising: a movably provided polarizing filter, and by rotating the polarizing filter, the amount of light of the monitoring beam incident on the photodetector is adjusted.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7800489U JPH0320034U (en) | 1989-06-30 | 1989-06-30 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7800489U JPH0320034U (en) | 1989-06-30 | 1989-06-30 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0320034U true JPH0320034U (en) | 1991-02-27 |
Family
ID=31620898
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP7800489U Pending JPH0320034U (en) | 1989-06-30 | 1989-06-30 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0320034U (en) |
-
1989
- 1989-06-30 JP JP7800489U patent/JPH0320034U/ja active Pending