GB1461201A - Optical tachometer - Google Patents

Optical tachometer

Info

Publication number
GB1461201A
GB1461201A GB1183274A GB1183274A GB1461201A GB 1461201 A GB1461201 A GB 1461201A GB 1183274 A GB1183274 A GB 1183274A GB 1183274 A GB1183274 A GB 1183274A GB 1461201 A GB1461201 A GB 1461201A
Authority
GB
United Kingdom
Prior art keywords
windows
light
detector
disc
source
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
GB1183274A
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.)
Plessey Co Ltd
Original Assignee
Plessey Co 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 Plessey Co Ltd filed Critical Plessey Co Ltd
Priority to GB1183274A priority Critical patent/GB1461201A/en
Publication of GB1461201A publication Critical patent/GB1461201A/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
    • G01P3/42—Devices characterised by the use of electric or magnetic means
    • G01P3/44—Devices characterised by the use of electric or magnetic means for measuring angular speed
    • G01P3/48—Devices characterised by the use of electric or magnetic means for measuring angular speed by measuring frequency of generated current or voltage
    • G01P3/481—Devices characterised by the use of electric or magnetic means for measuring angular speed by measuring frequency of generated current or voltage of pulse signals
    • G01P3/486—Devices characterised by the use of electric or magnetic means for measuring angular speed by measuring frequency of generated current or voltage of pulse signals delivered by photo-electric detectors

Abstract

1461201 Optical tachometer PLESSEY CO Ltd 26 Feb 1975 [18 March 1974] 11832/74 Heading G1A An optical tachometer comprises a disc 5 having windows 6 equally spaced in a ring with on opposite sides light source 1 and coaxial and relatively rotatable disc 7 having an equal number of windows 8 spaced in a ring and detector 2 receiving light from all windows simultaneously. Light from source 1 falls uniformly on windows 6. All windows 6 and 8 coincide simultaneously so that lens 9 concentrates light from all windows on detector 2, which, via terminals 3 and 4, operates a counter, indicator or a shaft speed control. In the embodiment of Fig. 3 (not shown), the second disc has reflectors instead of windows, and an annular source and the detector are on the same side of the discs. In the embodiment of Fig. 4, for gramophone turn-tables, the discs, one of which rotates, are annuli 5, 7 levelled at 11 and separated by opaque screen 16. Windows are formed between black ink on transparent plastic ribbon 12. Light from a number of sources 1 travels by total internal reflection as shown by lines 13, 14 to photo-cells 2, whose output is combined, maybe in series.
GB1183274A 1974-03-18 1974-03-18 Optical tachometer Expired GB1461201A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB1183274A GB1461201A (en) 1974-03-18 1974-03-18 Optical tachometer

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB1183274A GB1461201A (en) 1974-03-18 1974-03-18 Optical tachometer

Publications (1)

Publication Number Publication Date
GB1461201A true GB1461201A (en) 1977-01-13

Family

ID=9993548

Family Applications (1)

Application Number Title Priority Date Filing Date
GB1183274A Expired GB1461201A (en) 1974-03-18 1974-03-18 Optical tachometer

Country Status (1)

Country Link
GB (1) GB1461201A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0890842A1 (en) * 1997-07-08 1999-01-13 Alps Electric Co., Ltd. Optical encoder

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0890842A1 (en) * 1997-07-08 1999-01-13 Alps Electric Co., Ltd. Optical encoder
US6127677A (en) * 1997-07-08 2000-10-03 Alps Electric Co., Ltd. Optical encoder having optical conductor at the outer circumference of rotor

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Legal Events

Date Code Title Description
PS Patent sealed
PCNP Patent ceased through non-payment of renewal fee