GB1203787A - Improvements in graduation scales - Google Patents

Improvements in graduation scales

Info

Publication number
GB1203787A
GB1203787A GB40146/67A GB4014667A GB1203787A GB 1203787 A GB1203787 A GB 1203787A GB 40146/67 A GB40146/67 A GB 40146/67A GB 4014667 A GB4014667 A GB 4014667A GB 1203787 A GB1203787 A GB 1203787A
Authority
GB
United Kingdom
Prior art keywords
pattern
scales
centroids
windows
scale
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
GB40146/67A
Inventor
Gerhard Seewald
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
Application filed by Dr Johannes Heidenhain GmbH filed Critical Dr Johannes Heidenhain GmbH
Publication of GB1203787A publication Critical patent/GB1203787A/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
    • G01D5/34792—Absolute encoders with analogue or digital scales with only digital scales or both digital and incremental scales

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Medicinal Preparation (AREA)
  • Medicines Containing Antibodies Or Antigens For Use As Internal Diagnostic Agents (AREA)
  • Optical Transform (AREA)
  • Length Measuring Devices By Optical Means (AREA)

Abstract

1,203,787. Position indicating scales; photoelectric measurement systems. J. HEIDENHAIN [trading as WENCZLER & HEIDENHAIN]. Sept. 1, 1967 [Sept. 1, 1966], No. 40146/67. Headings G1A and G1J. A scale for use in determining the position of an object such as the work table of a machine tool comprises n graduation members a 6- i6 the centroids of which are spaced in accordance with a periodically repeated pattern and at integral numbers of a standard unit distance from each other, the pattern having a length of P units where P= n(n-1)/k + 1, k being an integer, and the pattern being such that for each integer x from 1 to n(n-1)/k,the centroids of k graduation members of any one pattern are spaced from the centroids of other graduation members of the same pattern or of one adjacent pattern by x units. Fig. 6 illustrates schematically the construction of a scale consisting of nine graduation members in the form of transparent windows and for which k=4. Thus the integers x equals 1 to 18 are each represented four times by the distance between the centroids of pairs of the windows. A scale constructed in accordance with a pattern complementary to that shown in Fig. 6, that is a scale having opaque portions where the pattern of Fig. 6 has windows, is illustrated in Fig.10 and consists of a number of repetitions of the pattern plus a number of blank portions. When a pair of such scales 100, 101 are moved relatively to each other and illuminated by a lamp 103 the light transmitted through the scales undergoes a steeper variation in intensity in the region of the position in which the windows in the two scales coincide than in any other relative positions. A photo-converter 106 provides an electrical signal in its output lead 107. (For Figures see next page)
GB40146/67A 1966-09-01 1967-09-01 Improvements in graduation scales Expired GB1203787A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DEW0042317 1966-09-01

Publications (1)

Publication Number Publication Date
GB1203787A true GB1203787A (en) 1970-09-03

Family

ID=7603182

Family Applications (1)

Application Number Title Priority Date Filing Date
GB40146/67A Expired GB1203787A (en) 1966-09-01 1967-09-01 Improvements in graduation scales

Country Status (4)

Country Link
CH (1) CH476987A (en)
DE (1) DE1548869B2 (en)
FR (1) FR1548418A (en)
GB (1) GB1203787A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4451731A (en) * 1981-08-10 1984-05-29 Hewlett-Packard Company Apparatus and method for modulating light to generate an index pulse
GB2168477A (en) * 1984-12-05 1986-06-18 Bei Electronics Zero reference generation for optical encoders
US4602155A (en) * 1983-07-25 1986-07-22 Bei Electronics, Inc. Zero reference generating method and apparatus for optical encoders

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4451731A (en) * 1981-08-10 1984-05-29 Hewlett-Packard Company Apparatus and method for modulating light to generate an index pulse
US4602155A (en) * 1983-07-25 1986-07-22 Bei Electronics, Inc. Zero reference generating method and apparatus for optical encoders
GB2168477A (en) * 1984-12-05 1986-06-18 Bei Electronics Zero reference generation for optical encoders
GB2168477B (en) * 1984-12-05 1989-09-06 Bei Electronics Zero reference generation for optical encoders

Also Published As

Publication number Publication date
CH476987A (en) 1969-08-15
DE1548869B2 (en) 1972-02-17
DE1548869A1 (en) 1971-05-13
FR1548418A (en) 1968-12-06

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Legal Events

Date Code Title Description
PS Patent sealed [section 19, patents act 1949]
PLNP Patent lapsed through nonpayment of renewal fees