JPS6242127U - - Google Patents
Info
- Publication number
- JPS6242127U JPS6242127U JP13333585U JP13333585U JPS6242127U JP S6242127 U JPS6242127 U JP S6242127U JP 13333585 U JP13333585 U JP 13333585U JP 13333585 U JP13333585 U JP 13333585U JP S6242127 U JPS6242127 U JP S6242127U
- Authority
- JP
- Japan
- Prior art keywords
- optical
- beam splitter
- polarizing beam
- magneto
- optical disk
- 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 16
- 238000001514 detection method Methods 0.000 claims description 5
- 230000010287 polarization Effects 0.000 claims description 2
- 230000001678 irradiating effect Effects 0.000 claims 1
- 239000004065 semiconductor Substances 0.000 description 1
Landscapes
- Optical Recording Or Reproduction (AREA)
- Optical Head (AREA)
Description
第１図は本案に係る光学ヘツドの光学系を示す
側面図、第２図はレーザ光の偏光状態を示すグラ
フ図、第３図は従来の光学ヘツドの光学系を示す
平面図である。
１０……半導体レーザ、１２……コリメータレ
ンズ、１３……アナモフイツクバイプリズム、１
４，１７……偏光ビームスプリツタ、１５，１８
……フアラデー光アイソレータ、（学学素子）、
１６……１／２波長板、１１……対物レンズ、１
９……光強度調整フイルタ、２０……凸レンズ（
第１の光検出系）、２１……２分割光センサ（第
１の光検出系）、２２……凸レンズ（第２の光検
出系）、２３……円筒レンズ（第２の光検出系）
、２４…４分割光センサ（第２の光検出系）。
FIG. 1 is a side view showing the optical system of the optical head according to the present invention, FIG. 2 is a graph showing the polarization state of laser light, and FIG. 3 is a plan view showing the optical system of the conventional optical head. 10... Semiconductor laser, 12... Collimator lens, 13... Anamorphic biprism, 1
4, 17...Polarizing beam splitter, 15, 18
... Faraday optical isolator, (Academic Elements),
16...1/2 wavelength plate, 11...Objective lens, 1
9...Light intensity adjustment filter, 20...Convex lens (
21... Two-split optical sensor (first photo detection system), 22... Convex lens (second photo detection system), 23... Cylindrical lens (second photo detection system)
, 24...4-split optical sensor (second optical detection system).
Claims (1)
・消去および再生を行う光学ヘツドであつて、平
行ビームを対物レンズに導く光学系を光路方向に
、第１の偏光ビームスプリツタと、光の偏光角度
を４５度回転させる第１の光学素子と、１／２波
長板と、第２の偏光ビームスプリツタとを前記光
磁気デイスクに対して平行に設け、前記第２の偏
光ビームスプリツタと、光の偏光角度を２２．５
度回転させる第２の光学素子と、サーボ可能に支
持した対物レンズとを前記光磁気デイスクに対し
て垂直に設け、前記光磁気デイスクからの戻り光
を前記第２の偏光ビームスプリツタと前記第１の
偏光ビームスプリツタを介して、その夫々の位置
に設けた第１の光検出系と第２の光検出系に導き
、この第１あるいは第２の光検出系の一方でラジ
アルエラー信号、他方でフオーカスエラー信号を
検出し、両光検出系の差動出力で再生信号を検出
するようにした光学ヘツド。 An optical head that records, erases, and reproduces information by irradiating a magneto-optical disk with a laser beam, in which an optical system that guides a parallel beam to an objective lens is connected in the optical path direction to a first polarizing beam splitter and a first polarizing beam splitter to polarize the light. A first optical element whose angle is rotated by 45 degrees, a 1/2 wavelength plate, and a second polarizing beam splitter are provided in parallel to the magneto-optical disk, and the second polarizing beam splitter The polarization angle of light is 22.5
A second optical element rotated by a second polarizing beam splitter and an objective lens supported in a servo manner are provided perpendicularly to the magneto-optical disk, and return light from the magneto-optical disk is directed to the second polarizing beam splitter and the second optical element. A radial error signal, An optical head that detects a focus error signal on the other hand, and detects a reproduced signal using the differential output of both optical detection systems.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP13333585U JPS6242127U (en) | 1985-08-31 | 1985-08-31 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP13333585U JPS6242127U (en) | 1985-08-31 | 1985-08-31 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS6242127U true JPS6242127U (en) | 1987-03-13 |
Family
ID=31033553
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP13333585U Pending JPS6242127U (en) | 1985-08-31 | 1985-08-31 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6242127U (en) |
-
1985
- 1985-08-31 JP JP13333585U patent/JPS6242127U/ja active Pending
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