JPS61182926U - - Google Patents
Info
- Publication number
- JPS61182926U JPS61182926U JP6481185U JP6481185U JPS61182926U JP S61182926 U JPS61182926 U JP S61182926U JP 6481185 U JP6481185 U JP 6481185U JP 6481185 U JP6481185 U JP 6481185U JP S61182926 U JPS61182926 U JP S61182926U
- Authority
- JP
- Japan
- Prior art keywords
- optical
- converging
- lens
- disk
- optical head
- 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 8
- 238000001514 detection method Methods 0.000 claims description 5
- 239000004065 semiconductor Substances 0.000 claims description 2
- 230000010287 polarization Effects 0.000 claims 1
- 238000010586 diagram Methods 0.000 description 5
- 238000007493 shaping process Methods 0.000 description 1
Description
第１図は本案に係る光ヘツドを示す斜視図、第
２図はその要部を示す側面図、第３図はその検出
系の回路系を示す回路図、第４図イ，ロ，ハはフ
オーカスエラー信号の検出を説明する系統図、第
５図は回路系の他の例を示す回路図、第６図は検
出系の他の例を示す要部斜視図、第７図は従来の
光ヘツドを示す光学系統図である。
１０……半導体レーザ、１１……コリメータレ
ンズ、１２，１２……ビーム成形プリズム、１３
……偏光ビームスプリツタ、１４……１／４波長
板、１５……９０度偏光ミラー、１６……対物レ
ンズ、１７……収束凸レンズ、１８……円柱レン
ズ、１９，２３……分割光検出器、２０，２１，
２４，２５……差動増幅器、Ｄ……デイスク。
Fig. 1 is a perspective view showing the optical head according to the present invention, Fig. 2 is a side view showing its main parts, Fig. 3 is a circuit diagram showing the circuit system of its detection system, and Fig. 4 A, B, and C are A system diagram explaining the detection of a focus error signal, FIG. 5 is a circuit diagram showing another example of the circuit system, FIG. 6 is a perspective view of main parts showing another example of the detection system, and FIG. 7 is a conventional system diagram. FIG. 3 is an optical system diagram showing an optical head. 10... Semiconductor laser, 11... Collimator lens, 12, 12... Beam shaping prism, 13
...Polarizing beam splitter, 14...1/4 wavelength plate, 15...90 degree polarizing mirror, 16...Objective lens, 17...Convex convex lens, 18...Cylindrical lens, 19, 23...Divided light detection vessel, 20, 21,
24, 25...differential amplifier, D...disk.
Claims (1)
を介し、対物レンズを通してデイスクに集束し光
学的に記録・再生を行う光情報記録再生装置の光
ヘツドであつて、前記光学系の偏光ビームスプリ
ツタを通して導かれるデイスクからの戻り光ビー
ムの偏光方向に収束凸レンズを設け、この収束凸
レンズに小径円柱レンズを光軸から位置をズラし
て取り付け、１個の分割光検出器を用いてトラツ
キング方向およびフオーカス方向のエラー検出を
行うようにしたことを特徴とする光ヘツド。 An optical head of an optical information recording and reproducing device that optically records and reproduces laser light emitted from a semiconductor laser by converging it onto a disk through an optical system and an objective lens. A converging convex lens is provided in the polarization direction of the returned light beam from the guided disk, and a small diameter cylindrical lens is attached to the converging convex lens at a position shifted from the optical axis, and one split photodetector is used to detect the tracking direction and the focusing direction. An optical head characterized in that it performs error detection.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP6481185U JPS61182926U (en) | 1985-04-30 | 1985-04-30 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP6481185U JPS61182926U (en) | 1985-04-30 | 1985-04-30 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS61182926U true JPS61182926U (en) | 1986-11-14 |
Family
ID=30596239
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP6481185U Pending JPS61182926U (en) | 1985-04-30 | 1985-04-30 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS61182926U (en) |
-
1985
- 1985-04-30 JP JP6481185U patent/JPS61182926U/ja active Pending
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