JPS6435518U - - Google Patents
Info
- Publication number
- JPS6435518U JPS6435518U JP12944887U JP12944887U JPS6435518U JP S6435518 U JPS6435518 U JP S6435518U JP 12944887 U JP12944887 U JP 12944887U JP 12944887 U JP12944887 U JP 12944887U JP S6435518 U JPS6435518 U JP S6435518U
- Authority
- JP
- Japan
- Prior art keywords
- detection
- light beam
- detecting
- detection element
- astigmatism
- 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
- 238000001514 detection method Methods 0.000 claims description 17
- 201000009310 astigmatism Diseases 0.000 claims description 6
- 230000003287 optical effect Effects 0.000 claims description 5
- 238000000034 method Methods 0.000 claims description 3
- 238000010586 diagram Methods 0.000 description 4
Landscapes
- Optical Recording Or Reproduction (AREA)
Description
第１図は本考案の一実施例を示す光ピツクアツ
プ装置のフオトセンサを示す平面図、第２図は本
考案の光ピツクアツプ装置の光学系の一例を示す
模型図、第３図は第１図のフオーカスエラー信号
を示す特性図、第４図は従来の非点収差法による
デイスクの信号面への光ビームの焦点ズレの検出
を行う為のフオトセンサを示す平面図、第５図は
トラツクジヤンプ中における従来のフオトセンサ
に照射される光スポツトのズレ方及び該光スポツ
トの光強度分布の表われ方を説明する為の説明図
である。
主な図番の説明、１……レーザーダイオード、
３……ハーフミラー、５……対物レンズ、８……
フオトセンサ、９……第１検出素子、１０……第
２検出素子、１１……第３検出素子、１２……第
４検出素子、１３……第５検出素子。
FIG. 1 is a plan view showing a photo sensor of an optical pickup device according to an embodiment of the present invention, FIG. 2 is a model diagram showing an example of the optical system of an optical pickup device according to the present invention, and FIG. A characteristic diagram showing the focus error signal. Figure 4 is a plan view showing a photo sensor for detecting the focal deviation of the light beam on the signal surface of the disk using the conventional astigmatism method. Figure 5 is a diagram showing the focus error signal during track jump. FIG. 2 is an explanatory diagram for explaining how a light spot irradiated on a conventional photo sensor shifts and how the light intensity distribution of the light spot appears. Explanation of main figure numbers, 1...laser diode,
3...half mirror, 5...objective lens, 8...
Photo sensor, 9...first detection element, 10...second detection element, 11...third detection element, 12...fourth detection element, 13...fifth detection element.
Claims (1)
使用される光ビームのフオーカスズレが非点収差
法により検出されると共に該光ビームのトラツキ
ングズレが３ビーム法により検出される光ピツク
アツプ装置において、光ビームのフオーカスズレ
を検出する検出面上に生じる一方の非点収差方向
に応じて形成された第１検出素子、それぞれ該第
１検出素子の前記検出面上に生じる他方の非点収
差方向に並設されると共に前記第１検出素子を挟
装する第２及び第３検出素子から成る主検出部と
、該主検出部の前記他方の非点収差方向に並設さ
れた第４及び第５検出素子から成る副検出部とを
前記検出面に設け、前記主検出部の各検出素子か
ら得られる出力信号を演算処理して光ビームのフ
オーカスズレに応じた信号を発生する様に成すと
共に前記副検出部の各検出素子から得られる出力
信号を演算処理して光ビームのトラツキングズレ
に応じた信号を発生する様に成した光ピツクアツ
プ装置。 In an optical pickup device, a focus shift of a light beam used to reproduce a signal recorded on a signal recording medium is detected by an astigmatism method, and a tracking shift of the light beam is detected by a three-beam method, A first detection element formed in accordance with the direction of one astigmatism occurring on the detection surface for detecting the focus shift of the light beam, and a first detection element formed in accordance with the direction of one astigmatism occurring on the detection surface of the first detection element, respectively aligned with the direction of the other astigmatism occurring on the detection surface of the first detection element. a main detecting section including second and third detecting elements arranged and sandwiching the first detecting element; and fourth and fifth detecting sections arranged in parallel in the astigmatism direction of the other main detecting section. A sub-detection section consisting of an element is provided on the detection surface, and the output signal obtained from each detection element of the main detection section is processed to generate a signal corresponding to the focus shift of the light beam. An optical pickup device is configured to perform arithmetic processing on the output signals obtained from each detection element of the section to generate a signal corresponding to the tracking deviation of a light beam.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP12944887U JPS6435518U (en) | 1987-08-26 | 1987-08-26 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP12944887U JPS6435518U (en) | 1987-08-26 | 1987-08-26 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS6435518U true JPS6435518U (en) | 1989-03-03 |
Family
ID=31383733
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP12944887U Pending JPS6435518U (en) | 1987-08-26 | 1987-08-26 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6435518U (en) |
-
1987
- 1987-08-26 JP JP12944887U patent/JPS6435518U/ja active Pending
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