GB270791A - Light projecting apparatus - Google Patents

Light projecting apparatus

Info

Publication number
GB270791A
GB270791A GB354926A GB354926A GB270791A GB 270791 A GB270791 A GB 270791A GB 354926 A GB354926 A GB 354926A GB 354926 A GB354926 A GB 354926A GB 270791 A GB270791 A GB 270791A
Authority
GB
United Kingdom
Prior art keywords
lens
light source
area
convex
plano
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
GB354926A
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.)
PERCY WILLIAM BEARD
Original Assignee
PERCY WILLIAM BEARD
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 PERCY WILLIAM BEARD filed Critical PERCY WILLIAM BEARD
Priority to GB354926A priority Critical patent/GB270791A/en
Publication of GB270791A publication Critical patent/GB270791A/en
Expired legal-status Critical Current

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21S—NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
    • F21S10/00—Lighting devices or systems producing a varying lighting effect
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21W—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES F21K, F21L, F21S and F21V, RELATING TO USES OR APPLICATIONS OF LIGHTING DEVICES OR SYSTEMS
    • F21W2131/00—Use or application of lighting devices or systems not provided for in codes F21W2102/00-F21W2121/00
    • F21W2131/40—Lighting for industrial, commercial, recreational or military use
    • F21W2131/406—Lighting for industrial, commercial, recreational or military use for theatres, stages or film studios

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Illuminated Signs And Luminous Advertising (AREA)

Abstract

270,791. Beard, P. W. Feb. 8, 1926. Lenses.-A lantern for stage or display lighting adapted to produce a small area of uniform light free of light source image, or if required larger areas, comprises two lens elements in combination, one consisting of a double concave lens 7 and a plano-convex 6 of short focal length, the other being a plano-convex lens 10 of longer focal length. With the two elements arranged as shown the small area beam is produced. By removing the first element and putting in its place the second, the focus of which then lies behind the light source, the beam of larger area is produced. A fourth convex lens 12, Fig. 3, may be mounted on the first element between the lens and the light source to increase the area of illumination.
GB354926A 1926-02-08 1926-02-08 Light projecting apparatus Expired GB270791A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB354926A GB270791A (en) 1926-02-08 1926-02-08 Light projecting apparatus

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB354926A GB270791A (en) 1926-02-08 1926-02-08 Light projecting apparatus

Publications (1)

Publication Number Publication Date
GB270791A true GB270791A (en) 1927-05-09

Family

ID=9760418

Family Applications (1)

Application Number Title Priority Date Filing Date
GB354926A Expired GB270791A (en) 1926-02-08 1926-02-08 Light projecting apparatus

Country Status (1)

Country Link
GB (1) GB270791A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1215437A2 (en) * 2000-12-18 2002-06-19 Dedo Weigert Film GmbH Projector having a focussing device and a divergent lens

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1215437A2 (en) * 2000-12-18 2002-06-19 Dedo Weigert Film GmbH Projector having a focussing device and a divergent lens
EP1215437A3 (en) * 2000-12-18 2003-12-17 Dedo Weigert Film GmbH Projector having a focussing device and a divergent lens

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