GB833329A - Apparatus for measuring, indicating or controlling mechanical displacements - Google Patents

Apparatus for measuring, indicating or controlling mechanical displacements

Info

Publication number
GB833329A
GB833329A GB1175355A GB1175355A GB833329A GB 833329 A GB833329 A GB 833329A GB 1175355 A GB1175355 A GB 1175355A GB 1175355 A GB1175355 A GB 1175355A GB 833329 A GB833329 A GB 833329A
Authority
GB
United Kingdom
Prior art keywords
photo
patches
indicating
code
measuring
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
GB1175355A
Inventor
David Silvester Evans
Patrick Ludlow Fleming Jones
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.)
Hilger and Watts Ltd
Original Assignee
Hilger and Watts 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 Hilger and Watts Ltd filed Critical Hilger and Watts Ltd
Priority to GB1175355A priority Critical patent/GB833329A/en
Publication of GB833329A publication Critical patent/GB833329A/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
    • G01D5/12—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 using electric or magnetic means
    • G01D5/25—Selecting one or more conductors or channels from a plurality of conductors or channels, e.g. by closing contacts
    • G01D5/252—Selecting one or more conductors or channels from a plurality of conductors or channels, e.g. by closing contacts a combination of conductors or channels

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Electrochromic Elements, Electrophoresis, Or Variable Reflection Or Absorption Elements (AREA)

Abstract

833,329. Indicating and measuring displacements photo-electrically. HILGER & WATTS Ltd. April 23, 1956 [April 22, 1955], No. 11753/55. Class 40 (3). [Also in Group XXXVI] Apparatus for measuring, indicating or controlling mechanical displacements of a member, such as, for example, a tape 5, Fig. 1, or a micrometer head D5, Fig. 5, the member being provided with an array of contrasting patches PI, P2, P3, &c. arranged according to a suitable code to indicate its displacement from a datum position P0 at which it is viewed by a line of photo-electric cells, such as BS5 in Fig. 5, is characterized by the use of miniature photo-conductive cells constructed as described in Specification 685,288. The invention reduces the size of the measuring apparatus and, by permitting the photo-electric cells to be placed closely adjacent the member, avoids the need for optical apparatus, such as glass rods, to image the code pattern patches on the cells. The cell outputs are applied to suitable circuit means IM for indicating or controlling the displacement of the member. Reference is made to the use of means for punching cards to indicate the displacement. In the arrangement shown in Fig. 5, two lines of photocells BS5 and BS5<1> are provided viewing duplicated patterns of patches 0, 1, 2, 3, &c., P0, P1, &c. and the member carries a guard ring GR formed of patches situated astride the separating lines between the code patterns 0, 1, 2, 3, &c. The guard ring is viewed by an additional photo-cell GC5<1> controlling a changeover relay R, and the arrangement is such that the indicating or control means IM is always connected to that line of photo-electric cells which is viewing the code pattern uniquely, i.e. without overlapping an adjacent pattern. The patterns of patches are arranged according to a binary code and the Specification discusses suitable codes. A method of constructing a unitary assembly of photo-electric cells for use in the invention is described (see Group XXXVI).
GB1175355A 1955-04-22 1955-04-22 Apparatus for measuring, indicating or controlling mechanical displacements Expired GB833329A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB1175355A GB833329A (en) 1955-04-22 1955-04-22 Apparatus for measuring, indicating or controlling mechanical displacements

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB1175355A GB833329A (en) 1955-04-22 1955-04-22 Apparatus for measuring, indicating or controlling mechanical displacements

Publications (1)

Publication Number Publication Date
GB833329A true GB833329A (en) 1960-04-21

Family

ID=9992070

Family Applications (1)

Application Number Title Priority Date Filing Date
GB1175355A Expired GB833329A (en) 1955-04-22 1955-04-22 Apparatus for measuring, indicating or controlling mechanical displacements

Country Status (1)

Country Link
GB (1) GB833329A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3229103A (en) * 1961-09-09 1966-01-11 Hensoldt & Sohne M Photoelectric position indicating device

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3229103A (en) * 1961-09-09 1966-01-11 Hensoldt & Sohne M Photoelectric position indicating device

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