GB725509A - Improvements relating to optical projection apparatus - Google Patents

Improvements relating to optical projection apparatus

Info

Publication number
GB725509A
GB725509A GB2171753A GB2171753A GB725509A GB 725509 A GB725509 A GB 725509A GB 2171753 A GB2171753 A GB 2171753A GB 2171753 A GB2171753 A GB 2171753A GB 725509 A GB725509 A GB 725509A
Authority
GB
United Kingdom
Prior art keywords
projection apparatus
optical projection
rays
light
signals
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
GB2171753A
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.)
Siemens Mobility Ltd
Original Assignee
Westinghouse Brake and Signal Co 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 Westinghouse Brake and Signal Co Ltd filed Critical Westinghouse Brake and Signal Co Ltd
Priority to GB2171753A priority Critical patent/GB725509A/en
Publication of GB725509A publication Critical patent/GB725509A/en
Expired legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B61—RAILWAYS
    • B61L—GUIDING RAILWAY TRAFFIC; ENSURING THE SAFETY OF RAILWAY TRAFFIC
    • B61L5/00—Local operating mechanisms for points or track-mounted scotch-blocks; Visible or audible signals; Local operating mechanisms for visible or audible signals
    • B61L5/12—Visible signals
    • B61L5/18—Light signals; Mechanisms associated therewith, e.g. blinders
    • B61L5/1809—Daylight signals
    • B61L5/1845—Optical systems, lenses

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Optical Elements Other Than Lenses (AREA)
  • Non-Portable Lighting Devices Or Systems Thereof (AREA)
  • Lenses (AREA)

Abstract

725,509. Railway signals. WESTINGHOUSE BRAKE & SIGNAL CO., Ltd., SHEPPARD, E. A., and STEVENS, S. A. Aug. 6, 1953, No. 21717/53. Addition to 676,644. Class 105. [Also in Group XI] The optical projection apparatus of the parent Specification, and comprising a transparent block consisting of a number of separate cups or shells 3e, 3f, &c. nested together one within the other, the arrangement being such that rays from the light source enter each cup or shell and emerge therefrom after reflection at the outer surface only, is modified in that each inner surface 7 is coated with a light-absorbing medium such as optical black paint. Thus, when the apparatus is used as a railway signal lamp there is no possibility of the formation of "phantom" signals by rays of light travelling down one or more of the cup elements by internal reflection at the abutting surfaces thereof and being reflected off the rear face of the lens to reemerge from the front thereof.
GB2171753A 1953-08-06 1953-08-06 Improvements relating to optical projection apparatus Expired GB725509A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB2171753A GB725509A (en) 1953-08-06 1953-08-06 Improvements relating to optical projection apparatus

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB2171753A GB725509A (en) 1953-08-06 1953-08-06 Improvements relating to optical projection apparatus

Publications (1)

Publication Number Publication Date
GB725509A true GB725509A (en) 1955-03-02

Family

ID=10167662

Family Applications (1)

Application Number Title Priority Date Filing Date
GB2171753A Expired GB725509A (en) 1953-08-06 1953-08-06 Improvements relating to optical projection apparatus

Country Status (1)

Country Link
GB (1) GB725509A (en)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3033071A (en) * 1958-06-03 1962-05-08 American Optical Corp Fiber optical field flattening devices
US3060789A (en) * 1958-08-28 1962-10-30 American Optical Corp Light-conducting fibers
US3328589A (en) * 1963-04-10 1967-06-27 Jr Thomas G Ferguson Photoelectric apparatus for providing pulsing signals including stacked plate focussing means
US3941458A (en) * 1973-07-02 1976-03-02 Raytheon Company Catoptric lens arrangement
WO2009094710A1 (en) * 2008-01-31 2009-08-06 Hella Australia Pty Ltd Optical warning device
EP2199178A1 (en) * 2008-12-18 2010-06-23 Thales Deutschland Holding GmbH Signal display

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3033071A (en) * 1958-06-03 1962-05-08 American Optical Corp Fiber optical field flattening devices
US3060789A (en) * 1958-08-28 1962-10-30 American Optical Corp Light-conducting fibers
US3328589A (en) * 1963-04-10 1967-06-27 Jr Thomas G Ferguson Photoelectric apparatus for providing pulsing signals including stacked plate focussing means
US3941458A (en) * 1973-07-02 1976-03-02 Raytheon Company Catoptric lens arrangement
WO2009094710A1 (en) * 2008-01-31 2009-08-06 Hella Australia Pty Ltd Optical warning device
EP2199178A1 (en) * 2008-12-18 2010-06-23 Thales Deutschland Holding GmbH Signal display

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