JP4687905B2 - LED lighting fixtures - Google Patents

LED lighting fixtures Download PDF

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Publication number
JP4687905B2
JP4687905B2 JP2006203363A JP2006203363A JP4687905B2 JP 4687905 B2 JP4687905 B2 JP 4687905B2 JP 2006203363 A JP2006203363 A JP 2006203363A JP 2006203363 A JP2006203363 A JP 2006203363A JP 4687905 B2 JP4687905 B2 JP 4687905B2
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Prior art keywords
light
surface
led
light source
reflective
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Expired - Fee Related
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JP2006203363A
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JP2008034124A (en
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英史 岡本
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スタンレー電気株式会社
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Description

  The present invention relates to an LED illumination lamp using an LED as a light source.

  The structure is such that light from the light source is introduced into the light guide through the light incident surface, and light guided in the light guide is emitted to the outside through the light output surface, and the area of the light output surface of the light source On the other hand, an illumination panel as shown in FIG. 7 has been proposed as an illumination panel in which the area of the light exit surface of the light guide is significantly large.

  The proposed lighting panel is a light guide 51 integrally formed of a light guide material, and an internal reflector 55 having light reflecting surfaces 52, 53, 54 is provided on one surface side of the light guide 51. In addition, a plurality of first reflecting surfaces 57 serving as the first reflecting means 56 are provided on the other surface.

  In the illumination panel having such a configuration, the light 59 that has traveled from the light source 58 at a right angle to the surface of the light guide 51 enters the light guide 51 and is guided through the light guide 51 so as to reflect the light. To be reflected by the light reflecting surfaces 53 and 54 and away from the light reflecting surfaces 53 and 54. The light 60 away from the light reflecting surfaces 53 and 54 is guided in the light guide 51 in parallel to the surface of the light guide 51 and reaches a plurality of first reflecting surfaces 57 serving as the first reflecting means 56. . The light that reaches each first reflection surface 57 is reflected by the first reflection surface 57 and leaves the first reflection surface 57. The light 61 away from the first reflecting surface 57 is directed to the light emitting surface 62 of the light guide 51, guided in the light guide 51, and emitted to the outside from the light emitting surface 62.

In some cases, the vapor-deposited layer 63 is provided on a surface of the light guide 51 other than the light incident surface of the light 59 from the light source 58 and the light emitting surface 62 facing the light incident surface to protect the surface. The reflector 55 is vacuum-deposited to improve the internal reflectance of the light reflecting surfaces 52, 53, and 54, thereby increasing the brightness of the light emitted from the light guide 51 emitted through the light emitting surface 62. (For example, refer to Patent Document 1).
US Pat. No. 5,1977,922

  By the way, in the above-mentioned illumination panel, when the vapor deposition layer is not provided on the surface of the light guide 51, the one located below the light guide 51 becomes visible through the light guide 51, and particularly when the light source 58 is turned off. Cause the problem of damage. When the vapor deposition layers 63 are partially provided on both surfaces of the light guide 51, the vapor deposition layer 63 is not formed over the entire surface of the same surface. Even if it is possible, the vapor deposition layer 63 cannot be seen integrally, and it is not satisfactory in terms of aesthetics.

  Therefore, the present invention was devised in view of the above problems, and its object is to convert light from an LED light source close to a point light source into a surface light source through an optical system, and at the time of turning on the LED light source. It is to provide an LED lighting device that produces an unexpected lighting effect and has a good appearance without deteriorating the beauty when the light source is turned off.

In order to solve the above-described problems, an invention according to claim 1 of the present invention is an LED light source on which at least one LED chip is mounted, and is positioned above the main light emitting direction of the LED light source. A light guiding lens having at least a light incident surface, a light emitting surface, a first reflecting surface, a second reflecting surface, and a third reflecting surface, and a surface of the light guiding lens facing the LED light source. A reflector that is located on or above the surface of the opposite surface and is made of a light-shielding and reflective material and has at least a fourth reflecting surface, or at least the entire surface opposite to the surface facing the translucent lens A light-shielding metal reflective layer is formed, and the metal reflective layer includes at least a reflector serving as a fourth reflective surface, wherein the first reflective surface is provided on an optical axis of the LED light source, and the second reflective surface And the third counter Face is provided in a ring shape centering around the optical axis, sequentially light said emitted from the LED light source through the light incident surface incident into the light guide lens is guided through the light guide lens Reflected by the first reflecting surface, the second reflecting surface, and the third reflecting surface and emitted to the outside through the light emitting surface, and the emitted light is reflected by the fourth reflecting surface of the reflector and irradiated. It is characterized by being light.

  Further, in the invention described in claim 2 of the present invention, in claim 1, the first reflecting surface has a virtual focus in the vicinity of the position of the main light emitting surface of the LED chip on the optical axis of the LED light source, A parabola whose principal axis is a line passing through the virtual focal point and orthogonal to the optical axis is formed by a part of a rotating paraboloid obtained by rotating around the optical axis, and is reflected by the first reflecting surface. The light is substantially parallel light, is guided through the light guide lens, and is emitted to the outside as substantially parallel light through the light exit surface.

  According to a third aspect of the present invention, in the first or second aspect, each of the second reflective surface and the third reflective surface is a total reflective surface and constitutes a prism. It is characterized by that.

  According to a fourth aspect of the present invention, in any one of the first to third aspects, the LED light source includes a plurality of types of LED chips having different emission colors. It is what.

  In the present invention, light from an LED light source enters a light guide lens, and light that has been guided through the light guide lens and emitted to the outside is reflected by a light-shielding reflector. Becomes the irradiation light. Therefore, the light from the LED light source close to the point light source is converted into a surface light source through the optical system, and an unexpected lighting effect is produced when the LED light source is turned on, and the wiring board located below when the light source is turned off. In addition, since an electronic component or the like cannot be seen, it has an advantage of being an LED lighting device having a good appearance without impairing its beauty.

  Hereinafter, preferred embodiments of the present invention will be described in detail with reference to FIG. 1 to FIG. 6 (the same parts are given the same reference numerals). The embodiments described below are preferable specific examples of the present invention, and thus various technically preferable limitations are given. However, the scope of the present invention particularly limits the present invention in the following description. As long as there is no description of the effect, it is not restricted to these aspects.

  FIG. 1 is a top view showing an embodiment of an LED illumination lamp of the present invention, FIG. 2 is a cross-sectional view taken along the line AA in FIG. 1, and FIG. The present embodiment includes an LED light source 1, a light guide lens 2, and a reflector 3.

  As shown in FIG. 2, the LED light source 1 serves as a light source for an LED lighting fixture, and an LED chip (not shown) is sealed with a transparent package 4 made of, for example, an epoxy resin. One or more LED chips are mounted in the package 4 in consideration of optical characteristics such as luminance and color tone required for the irradiation light of the LED illumination lamp. Among these, by configuring the LED light source with a plurality of LED chips having the same or different emission colors, a single-color, multi-color or full-color lamp can be obtained. In particular, a full-color lamp can be realized by mounting three types of LED chips, a red light emitting LED, a green light emitting LED, and a blue light emitting LED.

  For example, the LED light source 1 is mounted on the wiring board 20 together with other electronic components 21 and the like, and is fixed and electrically wired.

  The light guide lens 2 is formed by injection molding of a translucent material, for example, acrylic resin, polycarbonate resin, etc., and has a circular outer periphery, and a concave portion 5 for accommodating the LED light source 1 is formed on one facing side. Yes. As shown in FIG. 3, the recess 5 is based on the state of the LED light source 1, and the main light emitting surface of the LED chip 6 on the optical axis X that is the main light emitting direction of the LED light source 1 when the LED light source 1 is accommodated. 7 has a spherical surface 8 centered at a position Xp.

  Similarly, from FIG. 3, on the other surface side of the light guide lens 2 (on the side opposite to the side where the concave portion 5 having the spherical surface 8 is formed), a position Xp serving as the center of the concave portion having the spherical surface 8 is defined. A concave portion 10 having a paraboloid 9 obtained by rotating a part of a parabola around the optical axis X as a virtual focal point and rotating a part of the parabola whose main axis Y passes through the virtual focal point Xp and is orthogonal to the optical axis X is formed. Yes.

  Further, referring back to FIG. 2, a prism portion 11 bulging outward is formed at the outer peripheral end of the light guide lens 2. The light guide lens 2 is also disposed on the wiring board 20 together with the LED light source 1 and the electronic component 21. The prism portion 11 of the light guide lens 2 is formed by a reflection surface using total internal reflection of the light guide lens 2, a second reflection surface 16 and a third reflection surface 17. The second reflecting surface 16 and the third reflecting surface 17 are provided in a ring shape centered on the optical axis X, and the light from the first reflecting surface 15 is received by the second reflecting surface 16 and reflected in the optical axis X direction. Then, this light is received by the third reflecting surface 17 and reflected to the optical axis X side (in the direction of the reflector 3) in the main axis Y direction orthogonal to the optical axis X. The second reflecting surface 16 and the third reflecting surface 17 are naturally good as reflecting surfaces by applying a reflection process such as aluminum vapor deposition to the outer surface of the light guide lens 2.

  The reflector 3 has an outer peripheral circular shape having a diameter smaller than that of the light guide lens 2 and is disposed on the upper surface of the light guide lens 2 (the surface on the side where the concave portion 10 having the rotating paraboloid 9 is formed). On the surface side facing the lens 2 side surface, inclined surfaces 12 and horizontal surfaces 13 are alternately formed in a ring shape from the outer peripheral end portion toward the central portion, and swelled from the outer peripheral end portion side toward the central portion side. It has a shape.

  The horizontal plane 13 is a plane horizontal to the plane obtained by rotating the parabola principal axis Y around the optical axis X of the LED light source 1, and the inclined plane 12 is from the outer peripheral end side to the center side of the reflector 3. It is the surface that stands up toward At least the inclined surface 12 is a reflecting surface, and the reflector 3 has a light shielding property.

  The above is the basic configuration of the embodiment according to the present invention. Next, an optical description will be given in detail.

  First, light emitted from the LED light source 1 reaches the spherical surface 8 of the concave portion 5 of the light guide lens 2, and enters the light guide lens 2 with the spherical surface 8 serving as a light incident surface 14. At this time, since the spherical surface 8 is centered on the position Xp of the main light emitting surface 7 of the LED chip 6 on the optical axis X that is the main light emitting direction of the LED light source 1, the light path is refracted at the light incident surface 14. Without going straight, the light enters the light guide lens 2.

  The light that has entered the light guide lens 2 is guided through the light guide lens 2 and part of the light reaches the paraboloid 9. The paraboloid 9 has a virtual focal point at a position Xp of the main light exit surface 7 of the LED chip 6 on the optical axis X that is the main light exit direction of the LED light source 1, and therefore travels straight from the LED light source 1 to guide light. The light that has reached the rotary paraboloid 9 of the lens 2 is reflected by the rotary paraboloid 9 as the first reflecting surface 15 and becomes parallel light, and travels in the direction of the prism portion 11 parallel to the principal axis Y of the rotary paraboloid 9.

  The light (parallel light) reflected by the first reflecting surface 15 and directed toward the prism portion 11 is guided through the light guide lens 2 by the second reflecting surface 16 and the third reflecting surface 17 constituting the prism portion 11. The light is sequentially reflected (totally reflected) and travels in the direction of the reflector 3 parallel to the main axis Y as parallel light.

  The light (parallel light) reflected by the third reflecting surface and directed toward the reflector 3 is guided through the light guide lens 2 and reaches the light exit surface 18 of the light guide lens 2. The light exit surface 18 is provided substantially perpendicular to the main axis Y. The light exit surface 18 travels straight without being refracted and exits from the light guide lens 2.

  Of the light (parallel light) emitted from the light exit surface 18 of the light guide lens 2 toward the reflector 3, the light that reaches each ring-shaped inclined surface 12 serves as the fourth reflecting surface 19. The reflected light is reflected and used as the irradiation light L of the LED illumination lamp.

  When viewed from above the reflector with the LED light source turned on in the present embodiment of the configuration and optical system described above, as shown in FIG. 1, a bright spot (bright part 22) and a dark part (dark part 23) ) Appear alternately in a ring shape. That is, the LED illumination lamp of the present invention realizes a plurality of ring-shaped surface light sources by the LED light source 1 close to a point light source.

  Further, since the reflector 3 has a light shielding property, the LED light source 1 and the electronic component 21 mounted on the wiring board are not visible at all because they are positioned below. For this reason, when the LED light source 1 is turned off, the surface of the reflector 3 is visually recognized as it is, and when the LED light source 1 is turned on, the fourth reflecting surface 19 of the reflector 3 is as if the surface of the reflector 3 is a ring-shaped light source. Appears to emit light. In other words, it is possible to produce an unexpected production in which light suddenly appears from an empty place.

  In addition, the effect corresponding to it can be acquired by making the reflector 3 into various structures using that the light guide lens 2 and the reflector 3 are each produced separately. For example, as shown in FIG. 4, a light-shielding metal reflective film 24 of Al or the like is formed on the entire surface of the reflector 3 at least on the reflecting surface side by a method such as vapor deposition, so that the reflector 3 has both functions of reflection and light-shielding. Alternatively, as shown in FIG. 5, the reflector 3 is formed of a highly reflective resin 25 such as polycarbonate resin. In the former case, when the LED light source is turned off, a metallic feeling (metallic feeling) and a glossy feeling of the reflector 3 can be obtained, and when the LED light source is turned on, sharp light quality irradiation light can be obtained.

  On the other hand, in the latter case, the light reaching the fourth reflecting surface 19 of the reflector 3 when the LED light source is turned on is reflected by the fourth reflecting surface 19 and becomes diffusely reflected light. Therefore, when viewed from above the reflector 3, the boundary between the bright region and the dark region is intentionally blurred, and it is possible to obtain irradiation light with a soft light quality.

  Furthermore, the irradiation light can be controlled to a desired light distribution by appropriately changing the inclination angle θ of the reflection surface 19 of the reflector 3 as shown in FIG.

  Even if the reflector 3 having any of the above-described configurations is used, the wiring board or the electronic component positioned below cannot be seen, so that it is possible to realize an LED lighting device having a good appearance without impairing the aesthetic appearance.

  Furthermore, the reflective efficiency is improved by forming a metal reflective film such as Al on the second reflective surface 16 and the third reflective surface 17 constituting the prism portion 11 located at the outer peripheral end of the light guide lens 2, thereby It is possible to reduce the light guide loss in the light guide lens 2 and increase the luminance.

  In the present embodiment, the LED light source 1 and the light guide lens 2 are disposed on the wiring board 20. However, the LED light source 1 and the light guide lens 2 can ensure a predetermined positional relationship, and power is supplied to the LED light source 1. If it can supply, it is not necessarily restricted to using a wiring board.

It is a top view which shows embodiment concerning the LED lighting fixture of this invention. It is AA sectional drawing of FIG. It is the A section enlarged view of FIG. It is a fragmentary sectional view of the reflector which constitutes an embodiment. It is a fragmentary sectional view of the other reflector which constitutes an embodiment. It is a fragmentary sectional view of the other reflector which constitutes an embodiment. It is a fragmentary sectional view which shows a prior art example.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 LED light source 2 Light guide lens 3 Reflector 4 Package 5 Concave part 6 LED chip 7 Main light emission surface 8 Spherical surface 9 Parabolic surface 10 Concave part 11 Prism part 12 Inclined surface 13 Horizontal surface 14 Light incident surface 15 1st reflective surface 16 2nd reflection Surface 17 Third reflective surface 18 Light exit surface 19 Fourth reflective surface 20 Wiring board 21 Electronic component 22 Bright part 23 Dark part 24 Light-shielding metal reflective film 25 Highly reflective resin

Claims (4)

  1. An LED light source mounted with at least one LED chip;
    A light guide located above the main light emitting direction of the LED light source and made of a light-transmitting material and having at least a light incident surface, a light emitting surface, a first reflecting surface, a second reflecting surface, and a third reflecting surface. A lens,
    A reflector that is located on or above the surface of the light guide lens opposite to the surface facing the LED light source, is made of a light-shielding and reflective material, and has at least a fourth reflective surface, or at least the above-mentioned A light-shielding metal reflective layer is formed on the entire surface opposite to the surface facing the translucent lens, and the metal reflective layer includes at least a fourth reflective surface;
    The first reflective surface is provided on the optical axis of the LED light source, the second reflective surface and the third reflective surface are provided in a ring shape centered on the optical axis,
    Light emitted from the LED light source and incident into the light guide lens through the light incident surface is guided through the light guide lens and sequentially the first reflective surface, the second reflective surface, and the third An LED illumination lamp characterized by being reflected by a reflecting surface and emitted to the outside through the light emitting surface, and the emitted light is reflected by the fourth reflecting surface of the reflector to become irradiation light.
  2.   The first reflecting surface has a virtual focal point near the position of the main light emitting surface of the LED chip on the optical axis of the LED light source, and a parabola having a main axis passing through the virtual focal point and orthogonal to the optical axis, The light that is formed by a part of the paraboloid obtained by rotating around the optical axis and reflected by the first reflecting surface becomes substantially parallel light and is guided through the light guide lens, and the light. The LED illumination lamp according to claim 1, wherein the LED illumination lamp is emitted to the outside as substantially parallel light through an emission surface.
  3.   3. The LED illumination lamp according to claim 1, wherein each of the second reflection surface and the third reflection surface is a total reflection surface and constitutes a prism. 4.
  4.   The LED lighting device according to any one of claims 1 to 3, wherein a plurality of types of LED chips having different emission colors are mounted on the LED light source.
JP2006203363A 2006-07-26 2006-07-26 LED lighting fixtures Expired - Fee Related JP4687905B2 (en)

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JP2006203363A JP4687905B2 (en) 2006-07-26 2006-07-26 LED lighting fixtures

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JP5150335B2 (en) * 2008-03-28 2013-02-20 スタンレー電気株式会社 Light guiding lens
JP2010123309A (en) * 2008-11-18 2010-06-03 Koike Yasuhiro Optical element and light emitting device
JP2010212039A (en) * 2009-03-10 2010-09-24 Stanley Electric Co Ltd Lighting system
JP5635495B2 (en) * 2009-04-16 2014-12-03 株式会社光波 Light source module and planar light emitting device
JP5492637B2 (en) * 2010-03-31 2014-05-14 株式会社フジクラ Surface emitting device
JP5588217B2 (en) * 2010-04-26 2014-09-10 ツインバード工業株式会社 Lighting device
US8646941B1 (en) 2010-06-14 2014-02-11 Humanscale Corporation Lighting apparatus and method
CN102305369A (en) * 2011-05-10 2012-01-04 无锡科依德光电科技有限公司 Wall-surface invisible digital point light source system of building
CN102720971A (en) * 2012-06-28 2012-10-10 苏州向隆塑胶有限公司 The lighting device
CN103256543B (en) * 2013-05-02 2015-02-04 浙江深度照明有限公司 Automotive LED headlamp
CN103256545A (en) * 2013-05-29 2013-08-21 江苏文光车辆附件有限公司 Daytime driving lamp for cars
FR3010483B1 (en) * 2013-09-09 2015-09-18 Valeo Vision Vehicle custom lighting device
JP5761328B2 (en) * 2013-12-27 2015-08-12 スタンレー電気株式会社 Vehicle lamp
CN105674213B (en) * 2014-02-24 2018-10-30 京东方光科技有限公司 A kind of light guide and source of parallel light lighting device
CN103836541B (en) 2014-02-24 2016-08-17 京东方光科技有限公司 A kind of light guide and source of parallel light illuminator
JP2015228315A (en) * 2014-05-30 2015-12-17 オムロン株式会社 Diffused reflection structure and surface-emitting device comprising the same
JP6443682B2 (en) 2015-04-15 2018-12-26 カルソニックカンセイ株式会社 Lighting device for vehicle and cup holder
CN206130886U (en) * 2016-10-25 2017-04-26 深圳市大疆创新科技有限公司 Lamp shade, lamps and lanterns and aircraft

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JP2005203135A (en) * 2004-01-13 2005-07-28 Stanley Electric Co Ltd Led lamp using light guide body

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JP2002203417A (en) * 2000-12-28 2002-07-19 Nichia Chem Ind Ltd Light emitting device
JP2003100133A (en) * 2001-09-21 2003-04-04 Citizen Electronics Co Ltd Planar illumination device
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JP2005203135A (en) * 2004-01-13 2005-07-28 Stanley Electric Co Ltd Led lamp using light guide body

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