GB1498793A - Gramophone record detecting arrangement - Google Patents

Gramophone record detecting arrangement

Info

Publication number
GB1498793A
GB1498793A GB56188/73A GB5618873A GB1498793A GB 1498793 A GB1498793 A GB 1498793A GB 56188/73 A GB56188/73 A GB 56188/73A GB 5618873 A GB5618873 A GB 5618873A GB 1498793 A GB1498793 A GB 1498793A
Authority
GB
United Kingdom
Prior art keywords
light
turntable
record
apertures
detector
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
GB56188/73A
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.)
Nytell Software LLC
Original Assignee
Strathearn Audio 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
Application filed by Strathearn Audio Ltd filed Critical Strathearn Audio Ltd
Priority to GB56188/73A priority Critical patent/GB1498793A/en
Priority to US05/527,636 priority patent/US3966330A/en
Priority to DE19742457095 priority patent/DE2457095A1/en
Priority to JP49138559A priority patent/JPS50114203A/ja
Priority to FR7439678A priority patent/FR2253251A1/fr
Publication of GB1498793A publication Critical patent/GB1498793A/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
    • G11B19/00—Driving, starting, stopping record carriers not specifically of filamentary or web form, or of supports therefor; Control thereof; Control of operating function ; Driving both disc and head
    • G11B19/02—Control of operating function, e.g. switching from recording to reproducing
    • G11B19/12—Control of operating function, e.g. switching from recording to reproducing by sensing distinguishing features of or on records, e.g. diameter end mark
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B17/00—Guiding record carriers not specifically of filamentary or web form, or of supports therefor
    • G11B17/02—Details
    • G11B17/04—Feeding or guiding single record carrier to or from transducer unit
    • G11B17/05—Feeding or guiding single record carrier to or from transducer unit specially adapted for discs not contained within cartridges
    • G11B17/051—Direct insertion, i.e. without external loading means
    • G11B17/0515—Direct insertion, i.e. without external loading means adapted for discs of different sizes

Landscapes

  • Feeding And Guiding Record Carriers (AREA)

Abstract

1498793 Detecting record presence and size STRATHEARN AUDIO Ltd 4 Dec 1974 [4 Dec 1973 2 July 1974 (2)] 56188/73 29281/74 and 29282/74 Heading G5R In a record player the presence of a record on a turntable and its size are determined by a photo-electric detector arrangement. Light can be directed via apertures A, B and C in turntable 18 to detectors below the turntable and the record size determined by which of the apertures are closed by the record to the passage of light. Alternatively a light source can be associated with each aperture and positioned below the turntable and the light from the source is directed such that it is reflected by the underside of a record blocking an aperture to a corresponding light detector also below the turntable. In a second arrangement a flat beam of light 33 from an elongated source A is directed parallel to and slightly above the turntable 30 surface to an elongated light detector 34. The amount of the beam width which is blocked and hence the output signal of the detector depends on the record size. In further arrangements the light source can be above and to one side of the turntable and the light is directed by prisms or reflecting elements through apertures in the turntable. Alternatively the apertures can be internally reflecting or carry light guides. The record on the turntable can actuate one or more flaps to close apertures in the turntable and direct light from a source via the reflecting underside of the flap to a photo cell. The light sources can be modulated or coloured or a further detector responsive only to ambient light can be provided to offset the effect of such light on the main detectors.
GB56188/73A 1973-12-04 1973-12-04 Gramophone record detecting arrangement Expired GB1498793A (en)

Priority Applications (5)

Application Number Priority Date Filing Date Title
GB56188/73A GB1498793A (en) 1973-12-04 1973-12-04 Gramophone record detecting arrangement
US05/527,636 US3966330A (en) 1973-12-04 1974-11-27 Phonograph record detecting arrangement
DE19742457095 DE2457095A1 (en) 1973-12-04 1974-12-03 DEVICE AND METHOD FOR SENSE THE PRESENCE OF A RECORDING DISK ON A DISK
JP49138559A JPS50114203A (en) 1973-12-04 1974-12-04
FR7439678A FR2253251A1 (en) 1973-12-04 1974-12-04

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB56188/73A GB1498793A (en) 1973-12-04 1973-12-04 Gramophone record detecting arrangement

Publications (1)

Publication Number Publication Date
GB1498793A true GB1498793A (en) 1978-01-25

Family

ID=10475973

Family Applications (1)

Application Number Title Priority Date Filing Date
GB56188/73A Expired GB1498793A (en) 1973-12-04 1973-12-04 Gramophone record detecting arrangement

Country Status (1)

Country Link
GB (1) GB1498793A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0064671A1 (en) * 1981-05-01 1982-11-17 Kabushiki Kaisha Toshiba Optical disk apparatus

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0064671A1 (en) * 1981-05-01 1982-11-17 Kabushiki Kaisha Toshiba Optical disk apparatus
US4499571A (en) * 1981-05-01 1985-02-12 Tokyo Shibaura Denki Kabushiki Optical disk system with laser safety arrangement

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Legal Events

Date Code Title Description
PS Patent sealed [section 19, patents act 1949]
PCNP Patent ceased through non-payment of renewal fee
PCPE Delete 'patent ceased' from journal

Free format text: 4821,PAGE3123

PCNP Patent ceased through non-payment of renewal fee