ATE148665T1 - OPTICAL SYSTEM FOR CONTINUOUS LIGHT SIGNALS OF DIFFERENT COLORS, ESPECIALLY FOR RAILWAY SIGNALING - Google Patents

OPTICAL SYSTEM FOR CONTINUOUS LIGHT SIGNALS OF DIFFERENT COLORS, ESPECIALLY FOR RAILWAY SIGNALING

Info

Publication number
ATE148665T1
ATE148665T1 AT89830310T AT89830310T ATE148665T1 AT E148665 T1 ATE148665 T1 AT E148665T1 AT 89830310 T AT89830310 T AT 89830310T AT 89830310 T AT89830310 T AT 89830310T AT E148665 T1 ATE148665 T1 AT E148665T1
Authority
AT
Austria
Prior art keywords
lens
aspheric lens
aspheric
coinciding
concave
Prior art date
Application number
AT89830310T
Other languages
German (de)
Inventor
Luigi Vannini
Original Assignee
Ottico Fiorentino Di Vannini L
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 Ottico Fiorentino Di Vannini L filed Critical Ottico Fiorentino Di Vannini L
Application granted granted Critical
Publication of ATE148665T1 publication Critical patent/ATE148665T1/en

Links

Classifications

    • G—PHYSICS
    • G08—SIGNALLING
    • G08G—TRAFFIC CONTROL SYSTEMS
    • G08G1/00—Traffic control systems for road vehicles
    • G08G1/09—Arrangements for giving variable traffic instructions
    • G08G1/095—Traffic lights
    • 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

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Optical Communication System (AREA)
  • Optical Elements Other Than Lenses (AREA)
  • Train Traffic Observation, Control, And Security (AREA)
  • Non-Portable Lighting Devices Or Systems Thereof (AREA)

Abstract

In order to form an optical system for permanent luminous signals of three different colours, in particular for railway signalling, which has a smaller size, a greater luminosity and a higher stigmatism as compared with the systems known hitherto, and comprising three light sources 5 of different colour, with three corresponding mirrors 3 and three corresponding dichroic filters 6,7,8 arranged according to the Gouiler-Prande pentagonal prism, and with an aspheric emergence lens 9, it is provided for the aspheric lens 9 to be arranged with its focal point F coinciding with the centre 10 of the pentagonal prism, and for a divergent lens 11 of quadric surface and with virtual focus to be placed between the said centre 10 and the said aspheric lens 9, and with the axes of the divergent lens 11 and of the aspheric lens 9 coinciding. The said divergent lens 11 is of the negative-elliptical meniscus type, the spherical convex face of which, turned towards the aspheric lens 9, has its centre of curvature coinciding with the focal point of the said aspheric lens, and the concave face of which, ellipsoidal or spherical, can be obtained from Descartes' general equation. As an alternative, the divergent lens 11 is of the concave plano-hyperbolic type, or spherical plano-concave type, with the concave face turned towards the aspheric lens 9 and with the focal point coinciding with that of the said aspheric lens 9. The said mirrors 3 are of the parabolic type with maximum relative output. <IMAGE>
AT89830310T 1988-07-15 1989-07-04 OPTICAL SYSTEM FOR CONTINUOUS LIGHT SIGNALS OF DIFFERENT COLORS, ESPECIALLY FOR RAILWAY SIGNALING ATE148665T1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
IT8809448A IT1224982B (en) 1988-07-15 1988-07-15 OPTICAL SYSTEM FOR SIGNALS OF DIFFERENT COLORS, PERMANENTLY BRIGHT, ESPECIALLY FOR RAILWAY SIGNALING

Publications (1)

Publication Number Publication Date
ATE148665T1 true ATE148665T1 (en) 1997-02-15

Family

ID=11130291

Family Applications (1)

Application Number Title Priority Date Filing Date
AT89830310T ATE148665T1 (en) 1988-07-15 1989-07-04 OPTICAL SYSTEM FOR CONTINUOUS LIGHT SIGNALS OF DIFFERENT COLORS, ESPECIALLY FOR RAILWAY SIGNALING

Country Status (4)

Country Link
EP (1) EP0351380B1 (en)
AT (1) ATE148665T1 (en)
DE (1) DE68927750T2 (en)
IT (1) IT1224982B (en)

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH487367A (en) * 1968-12-12 1970-03-15 Camille Berger Michel Apparatus for the production of variously colored light beams
IT1144157B (en) * 1981-03-09 1986-10-29 Wabco Westinghouse Comp Italia TRAFFIC SIGNALING DEVICE ESPECIALLY FOR RAILWAY SIGNALING
US4754272A (en) * 1986-09-18 1988-06-28 General Signal Corporation Three aspect signalling device using no moving parts

Also Published As

Publication number Publication date
DE68927750T2 (en) 1997-09-04
EP0351380A3 (en) 1991-03-13
EP0351380B1 (en) 1997-02-05
IT1224982B (en) 1990-10-30
DE68927750D1 (en) 1997-03-20
IT8809448A0 (en) 1988-07-15
EP0351380A2 (en) 1990-01-17

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Legal Events

Date Code Title Description
UEP Publication of translation of european patent specification
REN Ceased due to non-payment of the annual fee