JPH01146315U - - Google Patents
Info
- Publication number
- JPH01146315U JPH01146315U JP3826388U JP3826388U JPH01146315U JP H01146315 U JPH01146315 U JP H01146315U JP 3826388 U JP3826388 U JP 3826388U JP 3826388 U JP3826388 U JP 3826388U JP H01146315 U JPH01146315 U JP H01146315U
- Authority
- JP
- Japan
- Prior art keywords
- objective lens
- information
- fixed
- light shielding
- track
- 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 5
- 238000001514 detection method Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
Landscapes
- Length Measuring Devices By Optical Means (AREA)
- Testing Of Optical Devices Or Fibers (AREA)
- Optical Recording Or Reproduction (AREA)
Description
第１図は、本考案に係る光学式ピツクアツプの
第１実施例を示す斜視図、第２図Ａ，Ｂは、２分
割光検出器によるレンズ位置検出態様を示す図、
第３図は、第２実施例を示す斜視図、第４図は、
第２実施例の４分割光検出器の出力信号から、位
置検出信号を得るための回路を示す図、第５図は
、第３実施例を示す斜視図、第６図Ａ，Ｂは、第
５図を示した実施例におけるレンズ位置検出態様
を示す図である。
図において、１は対物レンズ、２はレンズホル
ダ、３は弾性ワイヤー、４はベース、６は遮光部
材、７は光源、８は２分割光検出器、１５は４分
割光検出器、２７は遮光部材を示す。
FIG. 1 is a perspective view showing a first embodiment of an optical pickup according to the present invention, and FIGS. 2A and 2B are views showing how a lens position is detected by a two-split photodetector.
FIG. 3 is a perspective view showing the second embodiment, and FIG. 4 is a perspective view showing the second embodiment.
A diagram showing a circuit for obtaining a position detection signal from the output signal of the four-split photodetector of the second embodiment, FIG. 5 is a diagram showing a lens position detection mode in the embodiment shown in FIG. 5; FIG. In the figure, 1 is an objective lens, 2 is a lens holder, 3 is an elastic wire, 4 is a base, 6 is a light shielding member, 7 is a light source, 8 is a 2-split photodetector, 15 is a 4-split photodetector, 27 is a light shield Shows the parts.
Claims (1)
収束させて情報を読み取るために、対物レンズを
情報トラツクを横切るトラツキング方向と対物レ
ンズの光軸方向であるフオーカシング方向に電磁
駆動手段により駆動制御するにあたり、４本の線
状の弾性部材により前記対物レンズをベースに対
して支持した光学式ピツクアツプにおいて、遮光
部材を対物レンズを固定したレンズホルダの一部
に固定し、該遮光部材を挾むように光源と光検出
器を、レンズホルダの静止時に前記光源と遮光部
材と光検出器が一直線上に配列されるように、前
記ベースに固定し、且つ前記直線が情報トラツク
とほぼ平行に配置されると共に、前記対物レンズ
の光軸方向に配設されている２本の弾性部材間の
空間近傍に配置されるように構成したことを特徴
とする光学式ピツクアツプ。 In order to converge a light beam onto a recording medium on which information is recorded in the form of a track and read the information, the objective lens is driven and controlled by an electromagnetic drive means in a tracking direction that crosses the information track and in a focusing direction that is the optical axis direction of the objective lens. In an optical pickup in which the objective lens is supported on a base by four linear elastic members, a light shielding member is fixed to a part of the lens holder to which the objective lens is fixed, and a light source is placed between the light shielding members. and a photodetector are fixed to the base so that the light source, the light shielding member, and the photodetector are arranged in a straight line when the lens holder is at rest, and the straight line is arranged substantially parallel to the information track. . An optical pickup characterized in that it is arranged near a space between two elastic members arranged in the optical axis direction of the objective lens.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3826388U JPH01146315U (en) | 1988-03-25 | 1988-03-25 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3826388U JPH01146315U (en) | 1988-03-25 | 1988-03-25 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH01146315U true JPH01146315U (en) | 1989-10-09 |
Family
ID=31264820
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP3826388U Pending JPH01146315U (en) | 1988-03-25 | 1988-03-25 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH01146315U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH03187024A (en) * | 1989-12-15 | 1991-08-15 | Sony Corp | Objective lens driving device |
-
1988
- 1988-03-25 JP JP3826388U patent/JPH01146315U/ja active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH03187024A (en) * | 1989-12-15 | 1991-08-15 | Sony Corp | Objective lens driving device |
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