GB1325045A - Length or angle measurement apparatus - Google Patents

Length or angle measurement apparatus

Info

Publication number
GB1325045A
GB1325045A GB3720970A GB3720970A GB1325045A GB 1325045 A GB1325045 A GB 1325045A GB 3720970 A GB3720970 A GB 3720970A GB 3720970 A GB3720970 A GB 3720970A GB 1325045 A GB1325045 A GB 1325045A
Authority
GB
United Kingdom
Prior art keywords
scale
length
section
graduation
scanning
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
GB3720970A
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.)
Dr Johannes Heidenhain GmbH
Original Assignee
Dr Johannes Heidenhain GmbH
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
Priority claimed from DE19691938993 external-priority patent/DE1938993C/en
Application filed by Dr Johannes Heidenhain GmbH filed Critical Dr Johannes Heidenhain GmbH
Publication of GB1325045A publication Critical patent/GB1325045A/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
    • G01D5/36—Forming the light into pulses
    • G01D5/38—Forming the light into pulses by diffraction gratings

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Optical Transform (AREA)

Abstract

1325045 Photo-electric scale read-out DR JOHANNES HEIDENHAIN 31 July 1970 [31 July 19691 37209/70 Heading G1A In an apparatus for measuring lengths or angles, the graduation intervals of a scale each contain a plurality of successive sections along the scale to which a scanning device is responsive and each section is adapted to cause a response related to the position of the section in the graduation interval, the length of the scanning device being equal to or less than the length of a section and producing a response which varies progressively over a graduation interval. A plurality of scanning units spaced apart by a predetermined fraction of the graduation interval may be provided. The scale may be in the form of a plurality of parallel tracks from which coded values may be read electro-optically, capacitively or inductively and the different properties may be obtained by line formations or areal inclusions. Fig. 1 shows two photo-cells E 1 , E 2 , mounted on a plate 4 and receiving light reflected by the scale 3, light passing to and from the scale through scanning slits 4.
GB3720970A 1969-07-31 1970-07-31 Length or angle measurement apparatus Expired GB1325045A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE19691938993 DE1938993C (en) 1969-07-31 Multi-track coded length or angle measuring device

Publications (1)

Publication Number Publication Date
GB1325045A true GB1325045A (en) 1973-08-01

Family

ID=5741520

Family Applications (1)

Application Number Title Priority Date Filing Date
GB3720970A Expired GB1325045A (en) 1969-07-31 1970-07-31 Length or angle measurement apparatus

Country Status (2)

Country Link
FR (1) FR2053357B1 (en)
GB (1) GB1325045A (en)

Also Published As

Publication number Publication date
FR2053357B1 (en) 1973-04-27
DE1938993A1 (en) 1971-03-25
DE1938993B2 (en) 1972-07-06
FR2053357A1 (en) 1971-04-16

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Legal Events

Date Code Title Description
PS Patent sealed
PLNP Patent lapsed through nonpayment of renewal fees