EP1163472A1 - Luminaire - Google Patents

Luminaire

Info

Publication number
EP1163472A1
EP1163472A1 EP00907804A EP00907804A EP1163472A1 EP 1163472 A1 EP1163472 A1 EP 1163472A1 EP 00907804 A EP00907804 A EP 00907804A EP 00907804 A EP00907804 A EP 00907804A EP 1163472 A1 EP1163472 A1 EP 1163472A1
Authority
EP
European Patent Office
Prior art keywords
lighting fixture
casing
fixture according
support member
lens
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.)
Withdrawn
Application number
EP00907804A
Other languages
German (de)
English (en)
Inventor
Richard Dempster
Martin Freeborn
David Paul Steven
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.)
Strand Lighting Ltd
Original Assignee
Strand Lighting 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 Strand Lighting Ltd filed Critical Strand Lighting Ltd
Publication of EP1163472A1 publication Critical patent/EP1163472A1/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
    • F21V21/00—Supporting, suspending, or attaching arrangements for lighting devices; Hand grips
    • F21V21/14—Adjustable mountings
    • F21V21/30—Pivoted housings or frames
    • 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

Definitions

  • the present invention concerns high intensity light fixtures generally known as lummaires.
  • Luminaires can be used both for theatre, studio and architectural lighting applications.
  • luminaires which is particularly applicable to theatre and studio applications are provided with what are known as shutters. These are metal plates which can be moved into and out of the optical path of the lummaire so as to partially obstruct the light beam. Often a lum aire will be provided with at least four shutters though of course the complexity of the pattern which can be generated can be increased by increasing the number of shutters. However increasing the number of gates increases the weight, complexity and cost of a lummaire.
  • the present invention is concerned with providing a solution to the above problems.
  • Figure 1 is a side view of an embodiment of a lummaire according to the present invention.
  • Figure 2 is a view of the light-emittmg end of the lummaire of Figure 1 ;
  • Figure 3 s a perspective view of the casing which rotatably mounts the lummaire of Figures 1 and 2;
  • Figure 4 is a perspective view showing a bearing mounted in the lummaire body of Figure 3;
  • Figure 5 is a perspective view of one type of lens which can be incorporated n the lummaire of Figure 1;
  • Figure 6 is a perspective view of a second type of lens.
  • FIG. 1 of the drawings shows a luminaire 1 having a mam body comprising a rear end section 2 housing a high intensity light bulb and an associated substantially ellipsoidal reflector so as to generate a substantially parallel beam of light; and a front end section 3 which contains a section indicated at 4 for mounting four movable metal shutters 5.
  • the shutters 5 are arranged at 90° to one another and are standard in design.
  • Each shutter has a handle 6 by means of which it can be moved into and out of the optical path of light emanating from the light bulb.
  • the front end 3 includes a section 7 m which the focusing lenses of the lummaire are mounted.
  • a knurled knob 8 associated with a slot 9 enables the lenses to be moved axially along the optical path in the lummaire.
  • the lens system mounted within the front portion is, in this embodiment, totally conventional. In normal operation in a theatrical studio environment the luminaire just described would be supported from a mounting such as the telescopic member of a monopole by being connected to the mounting via a suitable arrangement such as a spigot on the casing of the luminaire which engages a suitable reception member carried on the mounting.
  • the luminaire is provided with a substantially circular rotator casing 10 mounted to the lower arms 11 of an inverted U-shaped member 12.
  • the crosspiece of the member 12 can carry a spigot corresponding to the spigot which would normally be mounted on the actual casing of the luminaire or can be mounted in any other suitable manner.
  • the rotator casing 10 is made from two moulded halves 14 which in operation are bolted together. Each half carries a pair of plastic bearings 15.
  • the bearings 15 are mounted on the rotator casing 10 so they are angularly spaced at 90° around the casing and are arranged to run either in parallel grooves provided in the rear section 2 of the main casing of the luminaire. Because of the presence of the casing 10 these grooves can not be seen but similar grooves 16 are provided in the front end section 3. Thus the luminaire can be mounted via either set of grooves.
  • Each bearing 15 has a central hole through which it is bolted onto a seat 17 m the interior wall of the rotator casing 10 by a bolt 18 and each side of the bearing is provided with a pair of upstanding flanges 19 which engage m respective ones of the parallel grooves 16 the lummaire casing.
  • the bearings 15 are made from any suitable tough and resilient material which is resistant to heat.
  • a suitable material is sold under the trademark Ultem 1010R.
  • the purpose of the bearings 15 is to enable the mounting of the luminaire casing within the rotator casing to be such that if the lummaire casing expands the resilience of the bearings 15 will be able to accommodate the expansion and still allow the lummaire to be freely rotated relative to the rotator casing 10.
  • the arrangement of rotator casing 10, bearings 15 and grooves the lummaire casing enable the entire lummaire to be rotated through 360°.
  • the rotator casing 10 In order to hold the luminaire in place once it has been rotated a desired amount the rotator casing 10 is provided with a lock knob 20 having a screw-threaded shaft 21 which by being screwed into a hole 22 in the rotator casing engages one of the bearings so as to press the bearing into contact with the luminaire casing thus locking the rotator casing and the luminaire casing against relative angular movement.
  • the fact that the bearings are mounted by a single central bolt enables the bearing to flex into contact with the luminaire casing to provide the necessary locking action.
  • the front end section of the luminaire carries a number of lenses for providing final focusing of the luminaire beam.
  • these lenses are spheric or aspheric glass lenses. Unless manufactured to very high tolerances such lenses are liable to a number of aberrations such as spherical coma, astigmatism, distortion and field curvature.
  • a variant of the embodiment described uses one or other of two types of lenses which use what is known as gradient index glass.
  • Such glass is manufactured by
  • GRADIUM Light Paths Technologies and is known as GRADIUM (RTM) .
  • the two types of gradient glass are respectively Radial and Axial .
  • the index of refraction of the glass varies from the centre of the glass to its outer edge.
  • Figure 5A illustrates a circular lens 30 and changes in refractive index in the lens 30 are indicated by the series of concentric rings 31 with the refractive index of the glass increasing or decreasing along the radius Z.
  • Figure 5B is a chart showing graphically this change of refractive index with the bars in the chart corresponding to the changes in refractive index.
  • the other type of gradient glass is axial glass and in axial glass the refractive index changes along the axis of the lens .
  • Figures 6A and 6B An axial lens is shown in Figures 6A and 6B. As in Figure 5B, Figure 6B is a graphical representation of the change in refractive index but in this case along the lens axis.
  • variable refractive index glass used in the lens shown in Figures 5A and 6A is normally manufactured by stacking layers of different index glass together in such a manner that there are no air gaps between the various layers. Layer diffusion can be used to weld the glass layer together.
  • An advantage of gradient lens is that the change of refractive index through the lens has the effect of counteracting aberrations such as spherical, coma, astiguation, distortion and field curvature. It will of course be appreciated that the lens themselves need not be circular as shown in the drawings.

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Non-Portable Lighting Devices Or Systems Thereof (AREA)

Abstract

L'invention porte sur un luminaire (1) comprenant un boîtier (2, 3) principal conçu pour abriter une source lumineuse, au moins une lentille, et le support (10, 11) du boîtier principal permettant de faire tourner ce dernier de 360° autour de son axe optique
EP00907804A 1999-03-24 2000-03-06 Luminaire Withdrawn EP1163472A1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
GB9906860A GB2348479B (en) 1999-03-24 1999-03-24 Lighting fixture
GB9906860 1999-03-24
PCT/GB2000/000790 WO2000057104A1 (fr) 1999-03-24 2000-03-06 Luminaire

Publications (1)

Publication Number Publication Date
EP1163472A1 true EP1163472A1 (fr) 2001-12-19

Family

ID=10850318

Family Applications (1)

Application Number Title Priority Date Filing Date
EP00907804A Withdrawn EP1163472A1 (fr) 1999-03-24 2000-03-06 Luminaire

Country Status (3)

Country Link
EP (1) EP1163472A1 (fr)
GB (1) GB2348479B (fr)
WO (1) WO2000057104A1 (fr)

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL8104430A (nl) * 1981-09-28 1983-04-18 Philips Nv Verlichtingsarmatuur.
GB2174181A (en) * 1985-04-04 1986-10-29 Quantum Lighting Ltd Light fitting
DE8702841U1 (de) * 1987-02-25 1987-04-09 Bron Elektronik AG, Allschwil, Basel Aufhängevorrichtung für fotografische Beleuchtungsgeräte
DE8806933U1 (de) * 1988-05-27 1988-07-14 B. Bacher GmbH, 7204 Wurmlingen Lampeneinheit für Belichtungsgeräte
AU2151395A (en) * 1995-02-10 1996-08-27 Fixonomen Remote-controlled searchlight operated by cable or by wireless communication

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO0057104A1 *

Also Published As

Publication number Publication date
GB2348479A (en) 2000-10-04
WO2000057104A1 (fr) 2000-09-28
GB2348479B (en) 2003-04-23
GB9906860D0 (en) 1999-05-19

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