GB643590A - Improvements in optical scale-reading systems - Google Patents

Improvements in optical scale-reading systems

Info

Publication number
GB643590A
GB643590A GB324148A GB324148A GB643590A GB 643590 A GB643590 A GB 643590A GB 324148 A GB324148 A GB 324148A GB 324148 A GB324148 A GB 324148A GB 643590 A GB643590 A GB 643590A
Authority
GB
United Kingdom
Prior art keywords
scale
projected
vernier
frame
image
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
GB324148A
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.)
JAMES AYLWIN BATY
Hilger and Watts Ltd
Original Assignee
JAMES AYLWIN BATY
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 JAMES AYLWIN BATY, Hilger and Watts Ltd filed Critical JAMES AYLWIN BATY
Priority to GB324148A priority Critical patent/GB643590A/en
Publication of GB643590A publication Critical patent/GB643590A/en
Expired legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
    • G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
    • G02B6/0033—Means for improving the coupling-out of light from the light guide
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
    • G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
    • G02B6/0066—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form characterised by the light source being coupled to the light guide
    • G02B6/0068—Arrangements of plural sources, e.g. multi-colour light sources

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Length-Measuring Instruments Using Mechanical Means (AREA)
  • Length Measuring Devices By Optical Means (AREA)

Abstract

643,590. Indicating-apparatus. HILGER & WATTS, Ltd., GODFREY, C. J., and BATY, J. A. Feb. 4, 1948, No. 3241. [Class 106 (iv)] [Also in Groups XX and XXII] To allow differential thermal expansion longitudinally of a scale and its frame, the scale is divided into several portions each attached to the frame by a key at one point on each of its longitudinal edges transversely opposite the other so as to provide a space between each portion. As shown in Fig. 1, the portions a of glass are held in a steel frame b by keys d of cement or metal, the portions being otherwise free in the frame. The scale may consist of transparent markings on an opaque ground, and for reading, an image of the scale h, Fig. 4, is projected on to a screen j against which is a vernier k consisting of a transparent plate having indentations o forming the vernier scale and illuminated by a lamp m so that the vernier markings appear as bright lines adjacent the projected image. In the arrangement shown in Fig. 7 the edgeilluminated scale q has divisions each onetenth of the size of the image of a division of the scale h projected on the screen, measurement being effected by moving the scale until one graduation coincides with the projected image s of one of the scale division of the scale h, the amount of movement being indicated on an additional scale shown below. Both main and vernier scales may be projected on to a screen or may be viewed directly, and the main scale may be edge-illuminated.
GB324148A 1948-02-04 1948-02-04 Improvements in optical scale-reading systems Expired GB643590A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB324148A GB643590A (en) 1948-02-04 1948-02-04 Improvements in optical scale-reading systems

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB324148A GB643590A (en) 1948-02-04 1948-02-04 Improvements in optical scale-reading systems

Publications (1)

Publication Number Publication Date
GB643590A true GB643590A (en) 1950-09-20

Family

ID=9754612

Family Applications (1)

Application Number Title Priority Date Filing Date
GB324148A Expired GB643590A (en) 1948-02-04 1948-02-04 Improvements in optical scale-reading systems

Country Status (1)

Country Link
GB (1) GB643590A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1266986B (en) * 1960-01-25 1968-04-25 Nat Res Dev Method and device for producing subdivided circular or round graduations with fine subdivisions

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1266986B (en) * 1960-01-25 1968-04-25 Nat Res Dev Method and device for producing subdivided circular or round graduations with fine subdivisions

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