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GB1438667A - Photosensitive apparatus with movable light control means - Google Patents

Photosensitive apparatus with movable light control means

Info

Publication number
GB1438667A
GB1438667A GB3151773A GB3151773A GB1438667A GB 1438667 A GB1438667 A GB 1438667A GB 3151773 A GB3151773 A GB 3151773A GB 3151773 A GB3151773 A GB 3151773A GB 1438667 A GB1438667 A GB 1438667A
Authority
GB
United Kingdom
Prior art keywords
light
movable member
bridge
sensitive
photo
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
GB3151773A
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.)
Bottorf S F
Wards H F E
Original Assignee
Bottorf S F
Wards H F E
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 Bottorf S F, Wards H F E filed Critical Bottorf S F
Priority to GB3151773A priority Critical patent/GB1438667A/en
Publication of GB1438667A publication Critical patent/GB1438667A/en
Expired legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
    • G01D5/00—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable
    • G01D5/26—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable characterised by optical transfer means, i.e. using infrared, visible, or ultraviolet light
    • G01D5/32—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable characterised by optical transfer means, i.e. using infrared, visible, or ultraviolet light with attenuation or whole or partial obturation of beams of light
    • G01D5/34—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable characterised by optical transfer means, i.e. using infrared, visible, or ultraviolet light with attenuation or whole or partial obturation of beams of light the beams of light being detected by photocells
    • G01D5/347—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable characterised by optical transfer means, i.e. using infrared, visible, or ultraviolet light with attenuation or whole or partial obturation of beams of light the beams of light being detected by photocells using displacement encoding scales
    • G01D5/34776—Absolute encoders with analogue or digital scales
    • G01D5/34784—Absolute encoders with analogue or digital scales with only analogue scales or both analogue and incremental scales
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
    • G01D5/00—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable
    • G01D5/26—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable characterised by optical transfer means, i.e. using infrared, visible, or ultraviolet light
    • G01D5/32—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable characterised by optical transfer means, i.e. using infrared, visible, or ultraviolet light with attenuation or whole or partial obturation of beams of light
    • G01D5/34—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable characterised by optical transfer means, i.e. using infrared, visible, or ultraviolet light with attenuation or whole or partial obturation of beams of light the beams of light being detected by photocells
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R17/00—Measuring arrangements involving comparison with a reference value, e.g. bridge
    • G01R17/02—Arrangements in which the value to be measured is automatically compared with a reference value
    • G01R17/06—Automatic balancing arrangements

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Investigating Or Analysing Materials By Optical Means (AREA)
  • Optical Transform (AREA)

Abstract

1438667 Using movable light control member with a photo-sensitive bridge control H F EDWARDS and S F BOTTORF 2 July 1973 31517/73 Heading G1A In a bridge control circuit 20 containing a condition-responsive (temperature) transducer 30 and a photo-sensitive device 34 receiving light from a source 36, that has not been obstructed by a movable member 42, the bridge is retroactively balanced by a meter 22 (fed by two amplifiers one, 24 sensitive to the current flowing through the bridge, the other, 26 sensitive to any unbalance) which is mechanically connected to the movable member 42 and thereby alters the amount of light falling on the photo-sensitive device until the bridge is balanced. The meter is calibrated prior to the connection of the condition-responsive transducer 30. The description discloses many forms that the movable member 42 can take. The common feature of most of the movable members is an opaque wedge or crescent shaped portion surrounded by a transparent portion, such as a segment of the curved surface of a cylinder as shown in Fig. 1 (and Figs. 3, 4 and 5 not shown) or such as a crescent on a disc (Figs. 8, 11, 12, 13 and 19 not shown). Two further embodiments are disclosed (Figs. 6, 7, 9, 10 not shown) which involve the light being reflected off the movable member with the movable member consisting of an opaque light absorbing central portion surrounded by a light reflecting portion.
GB3151773A 1973-07-02 1973-07-02 Photosensitive apparatus with movable light control means Expired GB1438667A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB3151773A GB1438667A (en) 1973-07-02 1973-07-02 Photosensitive apparatus with movable light control means

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB3151773A GB1438667A (en) 1973-07-02 1973-07-02 Photosensitive apparatus with movable light control means

Publications (1)

Publication Number Publication Date
GB1438667A true GB1438667A (en) 1976-06-09

Family

ID=10324265

Family Applications (1)

Application Number Title Priority Date Filing Date
GB3151773A Expired GB1438667A (en) 1973-07-02 1973-07-02 Photosensitive apparatus with movable light control means

Country Status (1)

Country Link
GB (1) GB1438667A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2328244A1 (en) * 1975-10-16 1977-05-13 Keystone Int ROTARY ELEMENT POSITION DETECTION AND CONTROL DEVICE
FR2590975A1 (en) * 1985-11-29 1987-06-05 Pirelli Cavi Spa POSITION OPTICAL SENSOR
WO2000028284A1 (en) * 1998-11-05 2000-05-18 Daimlerchrysler Ag Optical measuring device

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2328244A1 (en) * 1975-10-16 1977-05-13 Keystone Int ROTARY ELEMENT POSITION DETECTION AND CONTROL DEVICE
FR2590975A1 (en) * 1985-11-29 1987-06-05 Pirelli Cavi Spa POSITION OPTICAL SENSOR
GB2183827A (en) * 1985-11-29 1987-06-10 Pirelli Cavi Spa Optical position sensor
GB2183827B (en) * 1985-11-29 1990-03-21 Pirelli Cavi Spa Optical sensors
WO2000028284A1 (en) * 1998-11-05 2000-05-18 Daimlerchrysler Ag Optical measuring device

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Legal Events

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