WO2016088123A1 - Dispositif d'éclairage à del - Google Patents

Dispositif d'éclairage à del Download PDF

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Publication number
WO2016088123A1
WO2016088123A1 PCT/IL2015/051168 IL2015051168W WO2016088123A1 WO 2016088123 A1 WO2016088123 A1 WO 2016088123A1 IL 2015051168 W IL2015051168 W IL 2015051168W WO 2016088123 A1 WO2016088123 A1 WO 2016088123A1
Authority
WO
WIPO (PCT)
Prior art keywords
illumination device
substrates
tube
leds
light
Prior art date
Application number
PCT/IL2015/051168
Other languages
English (en)
Inventor
Nickolay BELENKIN
Original Assignee
Belenkin Nickolay
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 Belenkin Nickolay filed Critical Belenkin Nickolay
Publication of WO2016088123A1 publication Critical patent/WO2016088123A1/fr

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21K—NON-ELECTRIC LIGHT SOURCES USING LUMINESCENCE; LIGHT SOURCES USING ELECTROCHEMILUMINESCENCE; LIGHT SOURCES USING CHARGES OF COMBUSTIBLE MATERIAL; LIGHT SOURCES USING SEMICONDUCTOR DEVICES AS LIGHT-GENERATING ELEMENTS; LIGHT SOURCES NOT OTHERWISE PROVIDED FOR
    • F21K9/00—Light sources using semiconductor devices as light-generating elements, e.g. using light-emitting diodes [LED] or lasers
    • F21K9/20—Light sources comprising attachment means
    • F21K9/27—Retrofit light sources for lighting devices with two fittings for each light source, e.g. for substitution of fluorescent tubes
    • F21K9/275—Details of bases or housings, i.e. the parts between the light-generating element and the end caps; Arrangement of components within bases or housings
    • 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
    • F21V19/00—Fastening of light sources or lamp holders
    • F21V19/001—Fastening of light sources or lamp holders the light sources being semiconductors devices, e.g. LEDs
    • F21V19/003—Fastening of light source holders, e.g. of circuit boards or substrates holding light sources

Definitions

  • the present invention relates to a field of illumination, in general, and to an illumination device based on light-emitting diodes, in particular.
  • LEDs light-emitting diodes
  • Use of light-emitting diodes (LEDs) for applications requiring strong illumination has been enabled by recent efficiency improvements in commercially available LEDs that work adequately for many applications.
  • LED lamps are more energy efficient, do not emit heat and considered green technology.
  • the narrow illumination angle does not allow the LED lamps to reach the desired uniform light distribution. For example, in case of illuminated light boxes, the LED lamps cannot achieve uniform light distribution of both screens at the same time.
  • CN 102748599 mentions a LED lamp comprising a plurality of the LED light sources arranged on their respective substrates attached to the triangular heat radiating sleeve, and a lamp tube cylinder.
  • CN 201739796 U relates to a LED fluorescent lamp comprising a lamp tube, external power supply connectors fixed at two ends of the lamp tube, an internal power supply converter, a radiator and LED light sources.
  • This lamp is equipped with a tubular heat sink and the LED light sources arranged at intervals by 120° on the surface of the sink housing, forming a main luminous radiating framework.
  • US 20110019421 Al mentions a tubular LED illuminating device comprising a tubular shell, a supporting frame and a plurality of light emitting units.
  • An inner surface of the shell forms a plurality of elongate protrusions extending along a direction parallel to an axial direction of the shell.
  • the supporting frame is received in the shell and comprises three supporting plates.
  • WO 2014067329 Al mentions an LED lamp tube with a relatively large light-emitting angle.
  • the LED lamp tube comprises a cover and plugs arranged at both ends of the cover, a hollow triangular aluminium cylinder, and a printed circuit board (PCB) assembly.
  • PCB printed circuit board
  • the present invention is a novel and improved illumination device, which allows uniform distribution of the luminous flux produced by LED light sources over 360°.
  • a first aspect of the present invention is an illumination device comprising:
  • an optically transparent tube having a shape comprising a plurality of concave surfaces, wherein said concave surfaces are capable of creating lens effects
  • LEDs light-emitting diodes
  • Another aspect of the present invention is use of the illumination device in any indoor and outdoor illumination applications, for example two-sided illuminated light boxes in street signs, advertising stands, and the like, providing uniform light coverage over each screen.
  • Various embodiments of the invention may allow various benefits, and may be used in conjunction with various applications. The details of one or more embodiments are set forth in the accompanying figure and the description below. Other features, objects and advantages of the described techniques will be apparent from the description and drawings and from the claims.
  • Fig. 1A is a perspective view of the illumination device according to the invention.
  • Fig. IB is a triangular arrangement of the LEDs inside the optically transparent tube according to the invention.
  • Fig. 2 is a cross-section view of the optical tube profile according to the invention.
  • Fig. 3 is a cross-section view of the device according to the invention showing the path of light beams propagated from the illumination device of the invention containing three LEDs and placed between two screens;
  • Pig. 4 is a cross-section view of the prior art device with three LEDs inside the tube having the equal width shell, without concave surfaces, and the path of light beams propagated from such device;
  • Fig. 5A is a graph of a relative luminosity as a function of a deflection (radiation) angle for the illumination device with three LEDs but without lenses!
  • Fig. 5B is a graph of a relative luminosity as a function of a deflection (radiation) angle for the illumination device having three LEDs with lenses;
  • Fig. 6A is a light flux (distribution) diagram for the illumination device having three LEDs without lenses.
  • Fig. 6B is a light flux (distribution) diagram for the illumination device having three LEDs with lenses.
  • the present invention relates to a novel and improved illumination device, which allows for uniform distribution of the luminous flux produced by LED light sources over 360°.
  • a first aspect of the present invention is an illumination device comprising: a) an optically transparent tube having a shape comprising a plurality of concave surfaces, wherein said concave surfaces are capable of creating lens effects;
  • the device of the invention combines the advantages of a regular fluorescent lamp having an illumination angle of 360° and a low-energy consuming LED lamp.
  • the illumination device overcomes the limitation of narrow lighting angle of the LED lamps and allows considerable energy saving by reducing the number of the LED substrates, which require for uniform 360° light emission.
  • the device comprises a plurality of LED substrates integrated into an optically transparent tube having a shape comprising a plurality of concave surfaces which are not parallel to each other, thereby creating lens effects.
  • the special optical tube functions both as a casing of the device and as an optical instrument that allows increasing the light emission angle of LEDs and hence, achieving uniform illumination of the area.
  • Fig. 1A showing the perspective view of the illumination device according to the invention.
  • Optically transparent tube (l) having a plurality of concave surfaces along its outer surface is used as both a casing and an optical instrument for the LEDs mounted on their corresponding substrates (2).
  • adapter (5) is attached to tube (l) by means of screws (7), which firmly fix the LED substrates (2) at the permanent positions and thus prevent them from wobbling inside tube (l).
  • cap (6) at the end of tube (l) covers adapter (5) by means of screw (8).
  • the cap incorporates electrical pins and/or plugs.
  • Fig. IB shows a triangular arrangement of LEDs (10) inside the optically transparent tube.
  • the LEDs are mounted on their corresponding substrates (2), and the substrates are held using ring (15).
  • ring (15) This is an optional design, particularly useful in cases when the optical tube is made of materials, as detailed below, which are difficult to process.
  • the use of ring (15) is omitted, since substrates (2) are inserted directly into the tube's wall.
  • rivets or pins (3) are used to attach the electric contacts.
  • Substrate (2) is essentially a printed circuit board (PCB) for LEDs.
  • PCB printed circuit board
  • FIG. 2 showing a cross-section view of optical tube (l), which represents, inter alia, an optical instrument.
  • the shape of tube (l) comprises a plurality of concave outer surfaces (ll) and concave inner surfaces (12).
  • LEDs (10) are mounted on substrates (2), which are firmly held by protruding rails (16) made in the wall of tube (l).
  • the effect of expanding the light emission angle is reached by creating a concave curvature in the shapes of the transparent tube's surfaces to obtain segments of the tube in which the surfaces are not parallel to each other, thereby providing the required lens effect.
  • the resulted pseudo-lens has a complex double-concave shape defined by outer surface (ll), which extends from point (a) to point (b), and inner surface (12), which extends from point (c) to point (d). Further, LED substrates (2) are inserted inside tube (l), as shown in Fig. 2. Tube (l) has openings (9) designed for screws (7) that connect adapter (5) to tube (l).
  • Optically transparent materials for tube (l) can be any inorganic or polymeric organic materials, for example fused silica, transparent ceramics (such as crystalline alumina, spinel and yttrium aluminium garnet), calcium fluoride, magnesium fluoride, zinc selenide, optical polyimides, polycarbonates etc.
  • Deflection angle of light emitted by LEDs and passing through the concave surfaces can be changed in three following ways: a) by changing the curvature of outer concave surface (ll); b) by changing the distance between LED (ll) and inner concave surface (12), and c) by changing the tube's material, since different materials have different refractive indices which affect the strength of deflection occurring at the boundaries of the concave surfaces due to the refraction of the light beam. In fact, points (a), (b), (c) and (d) determine the theoretical deflection angle of light emitted by any particular LED placed at certain distance from inner concave surface (12).
  • the effect of the uniform light distribution with the LEDs can be clearly achieved by controlling the form of outer surface (ll), and inner surface (12) and/or by controlling the distance between the LED unit and the lens in front of it.
  • the required form and/or required distance between a LED and a lens depend on the tube's material chosen.
  • Fig. 3 depicts a cross-section view of the illumination device of the present invention placed between two screens (13) at distance (B), and paths of light beams (14) propagated from these three LEDs.
  • the aforementioned deflection angle (a) affects the size of the incident light zones (H) on screen surfaces (13), as a result of the overlap between light beams (14) when two or more LEDs are used.
  • Fig. 4 shows a cross-section view of a prior- art illumination device mentioned in the introductory part of the specification.
  • simple assembly of three LEDs (10) on three supporting substrates at an angle of 120° does not achieve the required uniform illumination over the circle of 360°.
  • Each LED (10) has a maximal deflection angle of light, which is 120°. Since the LEDs are not placed at the same physical spot, there will always be an unlit zone (S) between adjacent LEDs.
  • S unlit zone
  • LED (10) shown in Fig. 4 is able to distribute light over 120°, light intensity strongly varies with the deflection angle, wherein at the edges, it is significantly lower than in the centre, as shown in Fig. 5A.
  • Fig. 5B it is absolutely necessary to compensate for lower luminosity at the edges.
  • This can be achieved by expanding the deflection angle of light emitted by the LEDs using lenses, and thereby, creating light overlapping zones (H) on the screens or on any illuminated surface, according to embodiments of the present invention.
  • the advantages of applying lenses can be seen by comparison of the radiation pattern (light flux) for two models: with and without lenses.
  • the light distribution is significantly better, with only minor falls in light intensity below 60% in the following zones: 55°- 65°, 85°-95°, 175°-185°, 265°-275°, 295°-305°. In total, these zones of lower light intensity constitute approximately 10%- 15% of the illuminated area. In this model (with lenses), the deviations of light intensity are essentially smaller. As seen in Fig. 6B, light intensity reaches approximately 50% in the lowest points.
  • the light distribution angle of a single LED in the illumination device of the present invention can be as wide as 160°.
  • the form of the optical tube, substrates and contacts may be different from the triangular arrangement.
  • the optically transparent tube can be used even without concave surfaces (i.e., without lenses).
  • Another aspect of the present invention is use of the illumination device in any indoor and outdoor illumination applications, for example two-sided illuminated light boxes in street signs, advertising stands, and the like, providing uniform light coverage over each screen.

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Optics & Photonics (AREA)
  • Non-Portable Lighting Devices Or Systems Thereof (AREA)

Abstract

L'invention concerne un dispositif d'éclairage comportant un tube optiquement transparent présentant une forme dotée d'une pluralité de surfaces concaves, qui créent des effets de lentilles; une pluralité de diodes électroluminescentes (DEL) fixées sur une pluralité de substrats de DEL; des contacts électriques aux deux extrémités des substrats de DEL; un adaptateur fixé au tube; et un bouchon d'extrémité servant à recouvrir l'adaptateur. Les substrats peuvent être insérés ou fixés à la paroi du tube optiquement transparent, ou maintenus à l'intérieur du tube par un anneau de maintien.
PCT/IL2015/051168 2014-12-04 2015-12-02 Dispositif d'éclairage à del WO2016088123A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IL236086A IL236086A0 (en) 2014-12-04 2014-12-04 LED lamp
IL236086 2014-12-04

Publications (1)

Publication Number Publication Date
WO2016088123A1 true WO2016088123A1 (fr) 2016-06-09

Family

ID=52594908

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/IL2015/051168 WO2016088123A1 (fr) 2014-12-04 2015-12-02 Dispositif d'éclairage à del

Country Status (2)

Country Link
IL (1) IL236086A0 (fr)
WO (1) WO2016088123A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109578941A (zh) * 2018-12-25 2019-04-05 赛尔富电子有限公司 一种冰柜照明透镜系统

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20120170258A1 (en) * 2011-01-05 2012-07-05 Itc Incorporated Lighting assembly
CN202561508U (zh) * 2012-05-09 2012-11-28 深圳市聚智德科技有限公司 Led日光管发光结构
CN102913798A (zh) * 2012-11-05 2013-02-06 深圳市聚作照明股份有限公司 一种大角度发光的led灯管
US20130265746A1 (en) * 2012-04-05 2013-10-10 Michael W. May Non-Curvilinear LED Luminaries

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20120170258A1 (en) * 2011-01-05 2012-07-05 Itc Incorporated Lighting assembly
US20130265746A1 (en) * 2012-04-05 2013-10-10 Michael W. May Non-Curvilinear LED Luminaries
CN202561508U (zh) * 2012-05-09 2012-11-28 深圳市聚智德科技有限公司 Led日光管发光结构
CN102913798A (zh) * 2012-11-05 2013-02-06 深圳市聚作照明股份有限公司 一种大角度发光的led灯管

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109578941A (zh) * 2018-12-25 2019-04-05 赛尔富电子有限公司 一种冰柜照明透镜系统
EP3674642A1 (fr) * 2018-12-25 2020-07-01 Self Electronics Co., Ltd. Système de lentille d'éclairage pour congélateurs

Also Published As

Publication number Publication date
IL236086A0 (en) 2015-02-26

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