JPH02144123U - - Google Patents
Info
- Publication number
- JPH02144123U JPH02144123U JP5184989U JP5184989U JPH02144123U JP H02144123 U JPH02144123 U JP H02144123U JP 5184989 U JP5184989 U JP 5184989U JP 5184989 U JP5184989 U JP 5184989U JP H02144123 U JPH02144123 U JP H02144123U
- Authority
- JP
- Japan
- Prior art keywords
- optical head
- master disc
- tip
- sensor detects
- moves
- 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 9
- 238000013459 approach Methods 0.000 claims 2
- 230000002159 abnormal effect Effects 0.000 claims 1
- 229920002120 photoresistant polymer Polymers 0.000 claims 1
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical group [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 1
Landscapes
- Moving Of The Head For Recording And Reproducing By Optical Means (AREA)
- Manufacturing Optical Record Carriers (AREA)
Description
第１図は本考案による光学ヘツドを示す側面断
面図、第２図は従来の光学ヘツドを示す側面断面
図である。
１０……光学ヘツド、１１……原盤、１３……
対物レンズ、１４……ボビン、１５……コイル、
１６……ハウジング、１７……可動体、１８……
永久磁石、１９……外ヨーク、２０……内ヨーク
、２１……プラスチツクマグネツト、２２……中
空鉄心、２３……コイル、２５……アクチユエー
タ、２６……近接センサ。
FIG. 1 is a side sectional view showing an optical head according to the present invention, and FIG. 2 is a side sectional view showing a conventional optical head. 10...Optical head, 11...Master disc, 13...
Objective lens, 14...bobbin, 15...coil,
16... Housing, 17... Movable body, 18...
Permanent magnet, 19... Outer yoke, 20... Inner yoke, 21... Plastic magnet, 22... Hollow iron core, 23... Coil, 25... Actuator, 26... Proximity sensor.
Claims (1)
ヘツドとを相対的に移動させ、フオーカス制御を
行ないながら前記光学ヘツドにより前記原盤上の
フオトレジスト層にピツトを形成する原盤製作機
において、前記フオーカス制御を行なう光学ヘツ
ドに前記光学ヘツドの先端部が前記原盤の表面に
異常接近したことを検知するセンサと、このセン
サが前記異常接近が生じたことを検知したときに
前記光学ヘツドの先端部を前記原盤から離隔する
よう変位させるアクチユエータを設けたことを特
徴とする光学ヘツド。 In a master disc production machine that relatively moves a turntable on which a circular master disc is mounted and an optical head, and performs focus control, the optical head forms pits in a photoresist layer on the master disc. A sensor detects when the tip of the optical head approaches the surface of the master disc abnormally, and when this sensor detects that the abnormal approach has occurred, the tip of the optical head moves to the surface of the master disc. An optical head characterized in that it is provided with an actuator for displacing it away from the optical head.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP5184989U JPH02144123U (en) | 1989-05-01 | 1989-05-01 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP5184989U JPH02144123U (en) | 1989-05-01 | 1989-05-01 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH02144123U true JPH02144123U (en) | 1990-12-06 |
Family
ID=31571645
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP5184989U Pending JPH02144123U (en) | 1989-05-01 | 1989-05-01 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH02144123U (en) |
-
1989
- 1989-05-01 JP JP5184989U patent/JPH02144123U/ja active Pending