JPH02128222U - - Google Patents
Info
- Publication number
- JPH02128222U JPH02128222U JP3504589U JP3504589U JPH02128222U JP H02128222 U JPH02128222 U JP H02128222U JP 3504589 U JP3504589 U JP 3504589U JP 3504589 U JP3504589 U JP 3504589U JP H02128222 U JPH02128222 U JP H02128222U
- Authority
- JP
- Japan
- Prior art keywords
- optical
- semiconductor laser
- laser
- optical axis
- collimating lens
- 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 19
- 239000004065 semiconductor Substances 0.000 claims description 11
- 238000010586 diagram Methods 0.000 description 5
- 201000009310 astigmatism Diseases 0.000 description 3
- 230000004075 alteration Effects 0.000 description 1
Landscapes
- Optical Head (AREA)
- Moving Of The Head For Recording And Reproducing By Optical Means (AREA)
Description
第１図は本考案の一実施例に係る光学式ピツク
アツプの光学装置の説明図、第２図は半導体レー
ザの光軸コリメートレンズの光軸が一致している
場合のレーザビームのθ〃とθ⊥方向の焦点距離
を説明する明図、第３図は半導体レーザの光軸と
コリメートレンズの光軸がずれた場合のレーザビ
ームのθ〃とθ⊥方向の焦点位置を説明する説明
図、第４図は半導体レーザ２０の非点隔差（μｍ
）と、波面収差（ＲＭＳ）と、半導体レーザ２０
の光軸とコリメートレンズ２３の光軸のずれ量（
mm）との関係を示すグラフ、第５図は非点隔差の
補正を行うための従来の光学系を示す図、第６図
は半導体レーザビームのスポツトならびに非点隔
差を示す説明図である。
２０……半導体レーザ、２０ａ……接合面、２
３……コリメートレンズ、２４……対物レンズ、
０１−０１′……コリメートレンズの光軸、０２
−０２′……半導体レーザの光軸。
Fig. 1 is an explanatory diagram of an optical device of an optical pickup according to an embodiment of the present invention, and Fig. 2 shows θ〃 and θ of the laser beam when the optical axes of the optical axis collimating lenses of the semiconductor laser are aligned. Figure 3 is a clear diagram explaining the focal length in the ⊥ direction, and Figure 3 is an explanatory diagram explaining the focal position of the laser beam in the θ〃 and θ⊥ directions when the optical axis of the semiconductor laser and the optical axis of the collimating lens are misaligned. Figure 4 shows the astigmatism difference (μm) of the semiconductor laser 20.
), wavefront aberration (RMS), and semiconductor laser 20
The amount of deviation between the optical axis of the collimator lens 23 and the optical axis of the collimating lens 23 (
mm), FIG. 5 is a diagram showing a conventional optical system for correcting the astigmatism difference, and FIG. 6 is an explanatory diagram showing the spot of a semiconductor laser beam and the astigmatism difference. 20... Semiconductor laser, 20a... Junction surface, 2
3... Collimating lens, 24... Objective lens,
0 1 -0 1 '...Optical axis of collimating lens, 0 2
-0 2 '...Optical axis of semiconductor laser.
Claims (1)
れるレーザビームを平行光束にするコリメートレ
ンズを含み且つ、前記レーザビームを光デイスク
の記録面に集光する光学系と、光デイスクの記録
面から反射されたレーザビームを検知する受光素
子が備えられた光学式ピツクアツプの光学装置に
おいて、前記半導体レーザの光軸とコリメートレ
ンズの光軸とが前記半導体レーザの接合面に対し
て水平方向にずらされていることを特徴とする光
学式ピツクアツプの光学装置。 an optical system including a semiconductor laser, a collimating lens that converts a laser beam emitted from the semiconductor laser into a parallel beam, and focuses the laser beam on a recording surface of an optical disk; and a laser reflected from the recording surface of the optical disk. In an optical pickup optical device equipped with a light receiving element for detecting a beam, the optical axis of the semiconductor laser and the optical axis of the collimating lens are shifted in the horizontal direction with respect to the cemented surface of the semiconductor laser. Features an optical pickup device.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3504589U JPH02128222U (en) | 1989-03-27 | 1989-03-27 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3504589U JPH02128222U (en) | 1989-03-27 | 1989-03-27 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH02128222U true JPH02128222U (en) | 1990-10-23 |
Family
ID=31540060
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP3504589U Pending JPH02128222U (en) | 1989-03-27 | 1989-03-27 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH02128222U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH06168462A (en) * | 1992-11-30 | 1994-06-14 | Sharp Corp | Optical head |
-
1989
- 1989-03-27 JP JP3504589U patent/JPH02128222U/ja active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH06168462A (en) * | 1992-11-30 | 1994-06-14 | Sharp Corp | Optical head |
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