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GB443981A - Improvements in gramophone pick-ups - Google Patents

Improvements in gramophone pick-ups

Info

Publication number
GB443981A
GB443981A GB3039134A GB3039134A GB443981A GB 443981 A GB443981 A GB 443981A GB 3039134 A GB3039134 A GB 3039134A GB 3039134 A GB3039134 A GB 3039134A GB 443981 A GB443981 A GB 443981A
Authority
GB
United Kingdom
Prior art keywords
cells
ups
johnson
photo
mirror
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
GB3039134A
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.)
EDWARD NOEL JOHNSON
Original Assignee
EDWARD NOEL JOHNSON
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 EDWARD NOEL JOHNSON filed Critical EDWARD NOEL JOHNSON
Priority to GB3039134A priority Critical patent/GB443981A/en
Publication of GB443981A publication Critical patent/GB443981A/en
Expired legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor

Landscapes

  • Optical Communication System (AREA)

Abstract

443,981. Gramophone pick - ups; photo-electric cells. JOHNSON, R. G., 21, South Oswold Road, Edinburgh.-(Johnson, E. N. ; 24, Westminster Court, Highlands Road, Yeoville, Johannesburg, South Africa) Oct. 23, 1934, No. 30391. [Class 40 (iv)] [See also Group XL] A mirror 20 is mounted on the spindle of the stylus - carrier which oscillates about the axis 18. A beam of light from a lamp 21, is divided by a mirror 29, 30, into two parts 24a, 24<b>, which pass to the cathodes 32, 33 of two photo-electric cells through slits 26 in the casings 34, only one casing being shown. The electrical outputs of the cells are amplified and combined by the push-pull amplifier 28 and transmitted to the loud-speaker 27. The lamp, the mirrors and the cells are mounted on the tone arm 3.
GB3039134A 1934-10-23 1934-10-23 Improvements in gramophone pick-ups Expired GB443981A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB3039134A GB443981A (en) 1934-10-23 1934-10-23 Improvements in gramophone pick-ups

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB3039134A GB443981A (en) 1934-10-23 1934-10-23 Improvements in gramophone pick-ups

Publications (1)

Publication Number Publication Date
GB443981A true GB443981A (en) 1936-03-11

Family

ID=10306921

Family Applications (1)

Application Number Title Priority Date Filing Date
GB3039134A Expired GB443981A (en) 1934-10-23 1934-10-23 Improvements in gramophone pick-ups

Country Status (1)

Country Link
GB (1) GB443981A (en)

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