GB1410015A - Record transcription devices - Google Patents

Record transcription devices

Info

Publication number
GB1410015A
GB1410015A GB4196972A GB4196972A GB1410015A GB 1410015 A GB1410015 A GB 1410015A GB 4196972 A GB4196972 A GB 4196972A GB 4196972 A GB4196972 A GB 4196972A GB 1410015 A GB1410015 A GB 1410015A
Authority
GB
United Kingdom
Prior art keywords
record
electrode
probe
recording
transcription devices
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.)
Expired
Application number
GB4196972A
Inventor
Alfred Luigi Westlake
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.)
EMI Ltd
Original Assignee
EMI Ltd
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
Priority to GB5858271 priority Critical
Application filed by EMI Ltd filed Critical EMI Ltd
Priority to GB4196972A priority patent/GB1410015A/en
Publication of GB1410015A publication Critical patent/GB1410015A/en
Expired legal-status Critical Current

Links

Classifications

    • GPHYSICS
    • G11INFORMATION STORAGE
    • G11BINFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B9/00Recording or reproducing using a method not covered by one of the main groups G11B3/00 - G11B7/00; Record carriers therefor
    • G11B9/06Recording or reproducing using a method not covered by one of the main groups G11B3/00 - G11B7/00; Record carriers therefor using record carriers having variable electrical capacitance; Record carriers therefor
    • G11B9/07Heads for reproducing capacitive information
    • G11B9/075Heads for reproducing capacitive information using mechanical contact with record carrier, e.g. by stylus

Abstract

1410015 Capacitative transducers EMI Ltd 20 Nov 1972 [16 Dec 1971 9 Sept 1972] 58582/71 and 41969/72 Heading G5R A record 7 carrying a recording in the form of a pattern of surface deformations is disposed between an electrode 4, e.g. a turntable, and a skid 1 which constitutes or includes an electrically conductive probe 5 and is shaped so as to maintain the probe 5, as it scans the recording, at a substantially constant separation from the electrode 4, changes in electrical cpacitance between the probe 5 and the electrode 4, or, in the case of a conductive record 7, between the probe 5 and the record surface, being sensed by means 6, e.g. a capacitance bridge. The electrode 4 may be formed in the record which may be either a disc or a cylinder.
GB4196972A 1971-12-16 1972-09-09 Record transcription devices Expired GB1410015A (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
GB5858271 1971-12-16
GB4196972A GB1410015A (en) 1971-12-16 1972-09-09 Record transcription devices

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB4196972A GB1410015A (en) 1971-12-16 1972-09-09 Record transcription devices

Publications (1)

Publication Number Publication Date
GB1410015A true GB1410015A (en) 1975-10-15

Family

ID=26264791

Family Applications (1)

Application Number Title Priority Date Filing Date
GB4196972A Expired GB1410015A (en) 1971-12-16 1972-09-09 Record transcription devices

Country Status (1)

Country Link
GB (1) GB1410015A (en)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4295092A (en) * 1978-02-09 1981-10-13 Koa Oil Company, Limited Apparatus for and method of detecting and measuring corrosion damage in pipe
US4320491A (en) * 1980-09-19 1982-03-16 Rca Corporation Apparatus for video disc stylus electrode reconditioning
FR2492569A1 (en) * 1976-04-08 1982-04-23 Victor Company Of Japan
US4450550A (en) * 1981-09-30 1984-05-22 Rca Corporation Pickup circuit for video disc including dual-gate FET with injected RF
US4491941A (en) * 1976-04-08 1985-01-01 Victor Company Of Japan, Ltd. Reproducing stylus for an information signal recording medium

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2492569A1 (en) * 1976-04-08 1982-04-23 Victor Company Of Japan
US4491941A (en) * 1976-04-08 1985-01-01 Victor Company Of Japan, Ltd. Reproducing stylus for an information signal recording medium
US4295092A (en) * 1978-02-09 1981-10-13 Koa Oil Company, Limited Apparatus for and method of detecting and measuring corrosion damage in pipe
US4320491A (en) * 1980-09-19 1982-03-16 Rca Corporation Apparatus for video disc stylus electrode reconditioning
US4450550A (en) * 1981-09-30 1984-05-22 Rca Corporation Pickup circuit for video disc including dual-gate FET with injected RF

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Legal Events

Date Code Title Description
PS Patent sealed
PLNP Patent lapsed through nonpayment of renewal fees