JPS63200225U - - Google Patents
Info
- Publication number
- JPS63200225U JPS63200225U JP8892687U JP8892687U JPS63200225U JP S63200225 U JPS63200225 U JP S63200225U JP 8892687 U JP8892687 U JP 8892687U JP 8892687 U JP8892687 U JP 8892687U JP S63200225 U JPS63200225 U JP S63200225U
- Authority
- JP
- Japan
- Prior art keywords
- recording medium
- reflected light
- pickup device
- semiconductor laser
- information recording
- 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 7
- 239000004065 semiconductor Substances 0.000 claims description 3
- 239000006059 cover glass Substances 0.000 claims description 2
- 238000010586 diagram Methods 0.000 description 3
- 238000001514 detection method Methods 0.000 description 2
Landscapes
- Optical Head (AREA)
- 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図は媒体傾き時の反射光状態を示す概略側
面図、第3図は回路図、第4図は傾き量―差動出
力信号特性図、第5図は変形例を示す平面図、第
6図はその概略側面図、第7図は従来例を示す光
ピツクアツプ光学系の側面図、第8図はトラツク
用の検出素子の正面図、第9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
である。
1……半導体レーザ、5……対物レンズ、6…
…光情報記録媒体、6a……記録面、6b……カ
バーガラス面、11……スポツト、12a,12
b……受光素子、16a〜16d……受光素子。
Figure 1 is a schematic side view showing an embodiment of this invention, Figure 2 is a schematic side view showing the state of reflected light when the medium is tilted, Figure 3 is a circuit diagram, and Figure 4 is tilt amount - differential output. Figure 5 is a plan view showing a modified example, Figure 6 is a schematic side view thereof, Figure 7 is a side view of a conventional optical pickup optical system, and Figure 8 is a diagram of a detection element for tracking. The front view and FIG. 9 are far-field pattern characteristic diagrams showing the track error detection operation. 1... Semiconductor laser, 5... Objective lens, 6...
...Optical information recording medium, 6a... Recording surface, 6b... Cover glass surface, 11... Spot, 12a, 12
b... Light receiving element, 16a to 16d... Light receiving element.
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、前記光情報記録媒体の記録面からの反射
光を殆ど受光せずカバーガラス表面からの反射光
を受光する位置に対称的に配設させた少なくとも
一対の受光素子を設けたことを特徴とする光ピツ
クアツプ装置。 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 onto the optical information recording medium as a minute spot. An optical pickup device comprising at least a pair of light receiving elements arranged symmetrically at positions that receive almost no reflected light from the recording surface of a recording medium and receive reflected light from the surface of a cover glass.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP8892687U JPS63200225U (en) | 1987-06-09 | 1987-06-09 |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP8892687U JPS63200225U (en) | 1987-06-09 | 1987-06-09 |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS63200225U true JPS63200225U (en) | 1988-12-23 |
Family
ID=30947454
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP8892687U Pending JPS63200225U (en) | 1987-06-09 | 1987-06-09 |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS63200225U (en) |
-
1987
- 1987-06-09 JP JP8892687U patent/JPS63200225U/ja active Pending
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