FR2349263A7 - Stroboscopic timing system por record player turntable - uses compound array of markings to provide synchronisation at either 50 Hz on 60 Hz AC supply - Google Patents

Stroboscopic timing system por record player turntable - uses compound array of markings to provide synchronisation at either 50 Hz on 60 Hz AC supply

Info

Publication number
FR2349263A7
FR2349263A7 FR7611722A FR7611722A FR2349263A7 FR 2349263 A7 FR2349263 A7 FR 2349263A7 FR 7611722 A FR7611722 A FR 7611722A FR 7611722 A FR7611722 A FR 7611722A FR 2349263 A7 FR2349263 A7 FR 2349263A7
Authority
FR
France
Prior art keywords
markings
supply
stroboscopic
record player
timing system
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
FR7611722A
Other languages
French (fr)
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.)
Dual Gebruder Steidinger GmbH and Co
Original Assignee
Dual Gebruder Steidinger GmbH and Co
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 Dual Gebruder Steidinger GmbH and Co filed Critical Dual Gebruder Steidinger GmbH and Co
Priority to FR7611722A priority Critical patent/FR2349263A7/en
Application granted granted Critical
Publication of FR2349263A7 publication Critical patent/FR2349263A7/en
Expired legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01P—MEASURING LINEAR OR ANGULAR SPEED, ACCELERATION, DECELERATION, OR SHOCK; INDICATING PRESENCE, ABSENCE, OR DIRECTION, OF MOVEMENT
    • G01P3/00—Measuring linear or angular speed; Measuring differences of linear or angular speeds
    • G01P3/36—Devices characterised by the use of optical means, e.g. using infrared, visible, or ultraviolet light
    • G01P3/40—Devices characterised by the use of optical means, e.g. using infrared, visible, or ultraviolet light using stroboscopic means
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B23/00—Record carriers not specific to the method of recording or reproducing; Accessories, e.g. containers, specially adapted for co-operation with the recording or reproducing apparatus ; Intermediate mediums; Apparatus or processes specially adapted for their manufacture
    • G11B23/38—Visual features other than those contained in record tracks or represented by sprocket holes the visual signals being auxiliary signals
    • G11B23/42—Marks for indexing, speed-controlling, synchronising, or timing

Landscapes

  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Electromagnetism (AREA)
  • Power Engineering (AREA)
  • General Physics & Mathematics (AREA)
  • Optical Recording Or Reproduction (AREA)

Abstract

The stroboscopic system uses an array of markings, alternatively light and dark to indicate by the stroboscopic effect the speed of rotation of a record player turntable. The markings comprise short radial lines near the edge of the upper surface of the rotating platform. In order that the platform speed may be checked using either 50Hz or 60Hz supply, two interdigitated marking patterns are provided. Over a 20 degrees range identical markings are provided to give both 5 and 6 equal spaces. This permits stroboscopic timing using 50 or 60 Hz supply.
FR7611722A 1976-04-21 1976-04-21 Stroboscopic timing system por record player turntable - uses compound array of markings to provide synchronisation at either 50 Hz on 60 Hz AC supply Expired FR2349263A7 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
FR7611722A FR2349263A7 (en) 1976-04-21 1976-04-21 Stroboscopic timing system por record player turntable - uses compound array of markings to provide synchronisation at either 50 Hz on 60 Hz AC supply

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR7611722A FR2349263A7 (en) 1976-04-21 1976-04-21 Stroboscopic timing system por record player turntable - uses compound array of markings to provide synchronisation at either 50 Hz on 60 Hz AC supply

Publications (1)

Publication Number Publication Date
FR2349263A7 true FR2349263A7 (en) 1977-11-18

Family

ID=9172098

Family Applications (1)

Application Number Title Priority Date Filing Date
FR7611722A Expired FR2349263A7 (en) 1976-04-21 1976-04-21 Stroboscopic timing system por record player turntable - uses compound array of markings to provide synchronisation at either 50 Hz on 60 Hz AC supply

Country Status (1)

Country Link
FR (1) FR2349263A7 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2441234A1 (en) * 1978-11-02 1980-06-06 Dual Gebrueder Steidinger RECORDER TRAY, CARRYING STROBOSCOPIC MARKS AND METHOD OF MANUFACTURING THE SAME

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2441234A1 (en) * 1978-11-02 1980-06-06 Dual Gebrueder Steidinger RECORDER TRAY, CARRYING STROBOSCOPIC MARKS AND METHOD OF MANUFACTURING THE SAME

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