JPS55163634A - Optical signal reproducing head - Google Patents
Optical signal reproducing headInfo
- Publication number
- JPS55163634A JPS55163634A JP7029879A JP7029879A JPS55163634A JP S55163634 A JPS55163634 A JP S55163634A JP 7029879 A JP7029879 A JP 7029879A JP 7029879 A JP7029879 A JP 7029879A JP S55163634 A JPS55163634 A JP S55163634A
- Authority
- JP
- Japan
- Prior art keywords
- detectors
- photodetectors
- pair
- recording medium
- optical 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
Landscapes
- Optical Recording Or Reproduction (AREA)
Abstract
PURPOSE: To obtain the tracking error signal of high accuracy, by providing a pair of photodetectors at both ends of the optical path between the optical recording medium and the main plane at the side of the optical recording medium of the objective lens and then obtaining a pair of detection signals by receiving the plus and minus primary diffraction through the paired photodetectors.
CONSTITUTION: A pair of hemicyclic photodetectors 11 and 12 are respectively attached to the end face of the side of optical recording medium 2 of objective lens 10. For the purpose of passing the incident and reflected beams, central circular hole 13 is drilled at the center of the disk formed with detectors 11 and 12 in order to secure the coincidence between the center of hole 13 and optical axis L. At the same time, detectors 11 and 12 are attached to lens 10 so that the divided beams of detectors 11 and 12 may be in agreement with the track direction of medium 2. Also the detection signals according to the plus and minus primary diffraction beams 6 and 6' given from detectors 11 and 12 are supplied to the subtracting circuit to obtain the differential signal at output terminal 15. This difference signal is used for the tracking error signal.
COPYRIGHT: (C)1980,JPO&Japio
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP7029879A JPS55163634A (en) | 1979-06-05 | 1979-06-05 | Optical signal reproducing head |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP7029879A JPS55163634A (en) | 1979-06-05 | 1979-06-05 | Optical signal reproducing head |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS55163634A true JPS55163634A (en) | 1980-12-19 |
Family
ID=13427404
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP7029879A Pending JPS55163634A (en) | 1979-06-05 | 1979-06-05 | Optical signal reproducing head |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS55163634A (en) |
-
1979
- 1979-06-05 JP JP7029879A patent/JPS55163634A/en active Pending
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