EP1785667A2 - Optische Einheit mit einstellbaren Lichtstrahl - Google Patents

Optische Einheit mit einstellbaren Lichtstrahl Download PDF

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Publication number
EP1785667A2
EP1785667A2 EP06123798A EP06123798A EP1785667A2 EP 1785667 A2 EP1785667 A2 EP 1785667A2 EP 06123798 A EP06123798 A EP 06123798A EP 06123798 A EP06123798 A EP 06123798A EP 1785667 A2 EP1785667 A2 EP 1785667A2
Authority
EP
European Patent Office
Prior art keywords
optical group
light beam
group according
curvilinear surfaces
reflector
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.)
Granted
Application number
EP06123798A
Other languages
English (en)
French (fr)
Other versions
EP1785667B1 (de
EP1785667A3 (de
Inventor
Gian Pietro Beghelli
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.)
Beghelli SpA
Original Assignee
Beghelli SpA
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 Beghelli SpA filed Critical Beghelli SpA
Publication of EP1785667A2 publication Critical patent/EP1785667A2/de
Publication of EP1785667A3 publication Critical patent/EP1785667A3/de
Application granted granted Critical
Publication of EP1785667B1 publication Critical patent/EP1785667B1/de
Not-in-force legal-status Critical Current
Anticipated expiration legal-status Critical

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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
    • F21V14/00—Controlling the distribution of the light emitted by adjustment of elements
    • F21V14/04—Controlling the distribution of the light emitted by adjustment of elements by movement of reflectors
    • 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
    • F21V7/00—Reflectors for light sources
    • F21V7/10—Construction
    • F21V7/16—Construction with provision for adjusting the curvature
    • 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
    • F21V7/00—Reflectors for light sources
    • F21V7/10—Construction
    • F21V7/18—Construction with provision for folding or collapsing
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21S—NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
    • F21S9/00—Lighting devices with a built-in power supply; Systems employing lighting devices with a built-in power supply
    • F21S9/02—Lighting devices with a built-in power supply; Systems employing lighting devices with a built-in power supply the power supply being a battery or accumulator
    • 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
    • F21V7/00—Reflectors for light sources
    • F21V7/005—Reflectors for light sources with an elongated shape to cooperate with linear light sources
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21Y—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES F21K, F21L, F21S and F21V, RELATING TO THE FORM OR THE KIND OF THE LIGHT SOURCES OR OF THE COLOUR OF THE LIGHT EMITTED
    • F21Y2103/00—Elongate light sources, e.g. fluorescent tubes

Definitions

  • the present invention generally relates to an optical group with an adjustable light beam.
  • the invention relates to a lighting appliance, equipped with an optical group designed so that it can easily and rapidly vary the form of the light emission of the lighting appliance, according to the various application requirements.
  • emergency lamps must guarantee a light flow which is sufficiently intense and concentrated for allowing exits to be easily and rapidly identified, also and above all in cases of danger.
  • Luminance is the ratio between the intensity of a light source in a certain direction, and its apparent surface seen from the same direction; its value depends on the illumination, the reflection characteristics of the surfaces and the lighting and observation directions.
  • Illumination relating to a point of a surface, is defined as the ratio between the light flow which effects an element of the surface around the point, and the area of the element itself; the illumination can be easily predicted and measured by means of a luxmeter or illuminometer, and can therefore be conveniently and easily used for facing technical problems, such as for example the design of a lighting appliance.
  • the performances of a lamp are normally evaluated by establishing an illumination datum on a work or utilization plane, conventionally consisting of a horizontal surface at a certain distance from the floor.
  • Lamps and/or appliances with direct lighting are widely used for the artificial lighting of buildings for civil and industrial use, both as a main light source and as an emergency or safety source.
  • These lamps generally comprise a hollow body in which in which at least one fluorescent tube can be housed, connecting it to terminals which allow the electric charge; the body is closed by means of transparent protection screens, which can be disassembled to allow continuous access to the tube and terminals.
  • Known emergency lamps currently have a light distribution on the work plane which is not particularly uniform and substantially non-homogeneous, also in relation to the relative position of an observer with respect to the lamp.
  • the illumination is relatively concentrated and not very intense and it is therefore not possible in practice to obtain an acceptable compromise between the light flow intensity and concentration of the beam, important parameters when an emergency situation arises in civil and working environments and substitutive fluorescent lamps must be used for their lighting.
  • An objective of the present invention is therefore to eliminate the drawbacks reported, by providing an optical group with an adjustable light beam which allows the form of the light emission of a lighting appliance to be varied, in relation to the various application requirements, at the same time, guaranteeing illumination on the work plane which is both uniform and concentrated and also sufficiently intense.
  • a further objective of the present invention is to indicate an optical group with a variable light beam which satisfies the safety regulations in force.
  • Another objective of the invention is to provide an optical group with an adjustable light beam, which is relatively simple to construct, safe and reliable, using substantially known technologies and relative inexpensive components.
  • the invention advantageously defines a new optics for a lighting appliance, which offers the possibility of producing different light beams in relation to various regulations of an optical component.
  • optical performances remain the maximum, especially with respect to the extremely high efficiency, all regulation conditions.
  • the light efficiency is able to guarantee higher performances under all conditions of use (also for appliances so far reserved for special applications, such as watertight ceiling light fixtures with concentrating optics).
  • the optical group which produces an adjustable light beam is assembled inside lighting appliances (such as emergency lamps) of the type indicated with 8 in figures 1 and 2 enclosed, and essentially comprises two linear fluorescent lamps, indicated with 10 and 11, a specular reflector 12 having a shaped body 5 and a containment structure or lamp-holder 9.
  • the optical group has a symmetry with respect to the line S passing through the middle point M of the axis K joining the centres C1, C2 of the two fluorescent lamps 10, 11 and perpendicular to the same axis K.
  • the lamps 10, 11 are situated in fixed positions, whereas the body 5 of the specular reflector 12 is equipped with two side flaps 6, which, as they can be opened and closed (varying their angular position), allow the variation of the light beam; furthermore, each flap 6 effects symmetrical side movements with respect to the respective symmetry axis S of each branch A1, A2 of the body 5 of the reflector 12, which has a profile which has been specifically studied and constructed so as to obtain an optics with ideal behaviour in all configurations of use.
  • the body 5 of the reflector 12 consists of a central curvilinear surface consisting of two branches A1, A2, symmetrical with respect to the axis S of the optical group and, as already mentioned, in practice, the variation in the angular position of the flaps 6 allows light beams with different openings to be obtained.
  • the position represented in figure 5, with the flaps 6 in a so-called closed position creates a narrow light beam (diagram of figure 5A), suitable therefore for installations at great heights or in the presence of narrow areas to be illuminated (corridors, warehouses with racks, etc.).
  • Figure 4 schematically shows a functioning position with the flaps 6 in a partially open position (obtained by means of an approximate rotation of about 12 degrees from the closed position); in this case, the light beam produced is wider than the previous one (diagram of figure 4A) and guarantees excellent performances in installations.
  • Figure 3 shows a functioning position with the flaps 6 in a completely open position (obtained by an approximate rotation of about 24 degrees from the closed position); in this case, an extremely wide light beam is obtained (diagram of figure 3A), almost identical to that obtained with a traditional lighting appliance, with the same emitted light power.
  • the performances of the optical group are represented in both the diagrams of the light intensity distribution in the space of figures 3A, 4A, 5A, and also in the polar diagram of figure 6, where the diagrams of the illumination of an appliance of the traditional type are compared with those produced by the optical group according to the present invention, in the various functioning positions.
  • a central body 15 is used, suitably shaped, so that, in correspondence with the opposite sides, 16, 17 and 18, 19 respectively, it has relative sides having the same shape as the angular positions of the flaps 6 shown in figures 3-5 and, in particular, the "open” or “partially open” and “closed” positions, respectively illustrated in figures 3, 4 and 5 and corresponding to a diffusing beam geometry (figures 3 and 4 and surfaces of the body 15 indicated with 16 and 19) and concentrating (figure 5 and surfaces of the body 15 indicated with 17 and 18).
  • the central body 15 is suitably assembled to the body 5 of the reflector 12, for example according to a constructive solution by insertion, according to which the body 15 is kept in position, inside the central seat 25, positioned centrally with respect to the reflector 12, by means of the covering flaps 26, whose lower appendixes are engaged in the cavities 27 of the central seat 25.
  • the fulcrum consisting of the central pin 20, connected to the body 15 and rotating inside the interstice defined by the walls 21, 22 (solution illustrated in figure 7), allows the rotation of the same body 15 around the longitudinal axis, according to the direction of the arrow F.
  • the optical group according to the invention is particularly advantageous for its great uniformity and illumination area which is obtained and, in particular, for the fact that controlled photometric performances can be obtained.
  • a lighting appliance which comprises an optical group according to the invention, can not only substitute current lighting appliances, in particular suitable for emergency lighting, under all conditions so far considered, but in addition, its use can be extended to applications which have so far been reserved for special appliances (such as for example, watertight ceiling light fixtures with concentrating optics).

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Non-Portable Lighting Devices Or Systems Thereof (AREA)
  • Fastening Of Light Sources Or Lamp Holders (AREA)
  • Electrochromic Elements, Electrophoresis, Or Variable Reflection Or Absorption Elements (AREA)
  • Eyeglasses (AREA)
  • Fittings On The Vehicle Exterior For Carrying Loads, And Devices For Holding Or Mounting Articles (AREA)
  • Laser Surgery Devices (AREA)
  • Mechanical Light Control Or Optical Switches (AREA)
EP06123798A 2005-11-11 2006-11-10 Optische Einheit mit einstellbaren Lichtstrahl Not-in-force EP1785667B1 (de)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
IT000297A ITVI20050297A1 (it) 2005-11-11 2005-11-11 Gruppo ottico a fascio luminoso regolabile

Publications (3)

Publication Number Publication Date
EP1785667A2 true EP1785667A2 (de) 2007-05-16
EP1785667A3 EP1785667A3 (de) 2007-05-30
EP1785667B1 EP1785667B1 (de) 2009-09-30

Family

ID=37561326

Family Applications (1)

Application Number Title Priority Date Filing Date
EP06123798A Not-in-force EP1785667B1 (de) 2005-11-11 2006-11-10 Optische Einheit mit einstellbaren Lichtstrahl

Country Status (4)

Country Link
EP (1) EP1785667B1 (de)
AT (1) ATE444466T1 (de)
DE (1) DE602006009458D1 (de)
IT (1) ITVI20050297A1 (de)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101581440B (zh) * 2008-12-04 2011-03-30 余高辉 一种高亮度照明装置

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH07220513A (ja) * 1994-02-02 1995-08-18 Ohbayashi Corp 可変反射板を有する照明器具
EP0959296A2 (de) * 1998-05-20 1999-11-24 Herbert Waldmann GmbH & Co. Leuchte mit verstellbarem Reflektor
US20020105807A1 (en) * 2001-02-05 2002-08-08 Loughrey James F. Variable focus indirect lighting fixture

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH07220513A (ja) * 1994-02-02 1995-08-18 Ohbayashi Corp 可変反射板を有する照明器具
EP0959296A2 (de) * 1998-05-20 1999-11-24 Herbert Waldmann GmbH & Co. Leuchte mit verstellbarem Reflektor
US20020105807A1 (en) * 2001-02-05 2002-08-08 Loughrey James F. Variable focus indirect lighting fixture

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101581440B (zh) * 2008-12-04 2011-03-30 余高辉 一种高亮度照明装置

Also Published As

Publication number Publication date
EP1785667B1 (de) 2009-09-30
ITVI20050297A1 (it) 2007-05-12
ATE444466T1 (de) 2009-10-15
DE602006009458D1 (de) 2009-11-12
EP1785667A3 (de) 2007-05-30

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