JPH0166614U - - Google Patents
Info
- Publication number
- JPH0166614U JPH0166614U JP1987161090U JP16109087U JPH0166614U JP H0166614 U JPH0166614 U JP H0166614U JP 1987161090 U JP1987161090 U JP 1987161090U JP 16109087 U JP16109087 U JP 16109087U JP H0166614 U JPH0166614 U JP H0166614U
- Authority
- JP
- Japan
- Prior art keywords
- objective lens
- recording medium
- information recording
- light
- optical information
- 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 10
- 239000004065 semiconductor Substances 0.000 claims description 3
- 238000001514 detection method Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 1
Landscapes
- Optical Recording Or Reproduction (AREA)
Description
第１図はこの考案の一実施例を示す概略側面図
、第２図は受光素子の概略斜視図、第３図は従来
例を示す光ピツクアツプ光学系の側面図、第４図
はトラツク用の検出素子の正面図、第５図はトラ
ツクエラー検出動作を示すフアーフイールドパタ
ーン特性図、第６図はオフセツト原因を示す概略
側面図である。
１……半導体レーザ、５……対物レンズ、６…
…光情報記録媒体、１５……アパーチヤ、１６ａ
，１６ｂ……受光素子、１９……対物レンズ制御
手段。
Fig. 1 is a schematic side view showing an embodiment of this invention, Fig. 2 is a schematic perspective view of a light receiving element, Fig. 3 is a side view of a conventional optical pickup optical system, and Fig. 4 is a schematic side view of an optical pickup system for a truck. FIG. 5 is a front view of the detection element, FIG. 5 is a far-field pattern characteristic diagram showing the track error detection operation, and FIG. 6 is a schematic side view showing the cause of offset. 1... Semiconductor laser, 5... Objective lens, 6...
...Optical information recording medium, 15...Aperture, 16a
, 16b... Light receiving element, 19... Objective lens control means.
Claims (1)
レーザと、この半導体レーザからのレーザ光を前
記光情報記録媒体上に微小スポツトとして集光さ
せる対物レンズとを備えた光ピツクアツプ装置に
おいて、前記対物レンズに対しこの対物レンズ有
効径より小さい光束を入射させるアパーチヤを設
け、トラツク横切り方向に分割されて前記光情報
記録媒体からの反射光中の前記対物レンズへの入
射光路から外れた光束の一部を受光する一対の受
光素子を設け、これらの受光素子の差動信号に基
づき前記対物レンズをトラツク横切り方向に変位
させる対物レンズ制御手段を設けたことを特徴と
する光ピツクアツプ装置。 In an optical pickup device comprising an optical information recording medium, a semiconductor laser that emits a laser beam, and an objective lens that focuses the laser beam from the semiconductor laser as a minute spot on the optical information recording medium, the objective lens An aperture is provided to allow a light beam smaller than the effective diameter of the objective lens to be incident thereon, and a part of the light beam reflected from the optical information recording medium that deviates from the optical path of incidence on the objective lens is divided in the cross-track direction. 1. An optical pickup device comprising: a pair of light receiving elements for receiving light; and objective lens control means for displacing the objective lens in a direction across a track based on differential signals of these light receiving elements.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1987161090U JPH0166614U (en) | 1987-10-21 | 1987-10-21 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1987161090U JPH0166614U (en) | 1987-10-21 | 1987-10-21 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0166614U true JPH0166614U (en) | 1989-04-28 |
Family
ID=31443732
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1987161090U Pending JPH0166614U (en) | 1987-10-21 | 1987-10-21 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0166614U (en) |
-
1987
- 1987-10-21 JP JP1987161090U patent/JPH0166614U/ja active Pending