JPS55163634A - Optical signal reproducing head - Google Patents

Optical signal reproducing head

Info

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
Application number
JP7029879A
Other languages
Japanese (ja)
Inventor
Mikio Sugiki
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Sony Corp
Original Assignee
Sony Corp
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Sony Corp filed Critical Sony Corp
Priority to JP7029879A priority Critical patent/JPS55163634A/en
Publication of JPS55163634A publication Critical patent/JPS55163634A/en
Pending legal-status Critical Current

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
JP7029879A 1979-06-05 1979-06-05 Optical signal reproducing head Pending JPS55163634A (en)

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)

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