JP2015002180A - Light-emitting diode luminaire - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a light-emitting diode luminaire excellent in a light collection effect.SOLUTION: A light-emitting diode luminaire includes a reflection cover and a plurality of light-emitting diode light sources provided in the reflection cover. The reflection cover includes an internal surface, an external surface and a top surface continuously contacting the internal surface and the external surface. In the top surface, an opening is formed. The internal surface is a reflection surface. The plurality of light-emitting diode light sources is installed near the inside of the top surface of the opening. Light emitted from the light-emitting diode light sources is emitted to outside through the opening after being reflected by the internal surface.

Description

  The present invention relates to a lighting device, and more particularly to a light emitting diode lighting device.

  A light emitting diode (LED) is currently widely used as a new type of light source because it has advantages such as high brightness, low voltage, low power consumption, and long life. However, since the light emission range of the light emitting diode is generally 120 degrees, its light collection effect is poor.

  In order to solve the above-described problems, the present invention provides a light-emitting diode illuminating device having an excellent light collecting effect.

  A light-emitting diode illuminating device according to the present invention includes a reflective cover and a plurality of light-emitting diode light sources provided in the reflective cover. The reflective cover includes an inner surface, an outer surface, and a top surface that connects the inner surface and the outer surface, an opening is formed in the top surface, the inner surface is a reflective surface, and a plurality of light emitting diodes A light source is installed near the inside of the top surface of the opening, and light emitted from the light emitting diode light source is reflected by the inner surface and then emitted to the outside through the opening.

  Compared with the prior art, in the light emitting diode illuminating device of the present invention, the light emitted from the plurality of light emitting diode light sources is reflected by the reflective cover and then emitted to the outside. Thereby, the outstanding condensing effect can be acquired.

It is a top view of the light emitting diode illuminating device which concerns on embodiment of this invention. It is sectional drawing which follows the II-II line of the light-emitting-diode illuminating device shown in FIG. It is a cross-sectional curve figure of the inner surface of the reflective cover of the light emitting diode illuminating device shown in FIG. It is a light intensity effect figure of the light emitting diode illuminating device shown in FIG. It is another light intensity effect figure of the light emitting diode illuminating device shown in FIG.

  Embodiments of the present invention will be described below with reference to the drawings.

  Referring to FIGS. 1 and 2, a light-emitting diode illuminating apparatus 1 according to an embodiment of the present invention includes a reflective cover 10, a plurality of light-emitting diode light sources 20 and a plurality of light-emitting diode light sources 20 provided in the reflective cover 10. A fixing unit 30 is provided for fixing on the reflective cover 10.

  The reflective cover 10 is symmetric with respect to the axis OO 'and has a substantially U-shaped cross section (see FIG. 3). An opening 11 is formed at the top of the reflective cover 10. The reflective cover 10 includes an inner surface 12, an outer surface 13, and a top surface 14 that connects the inner surface 12 and the outer surface 13. The inner surface 12 and the outer surface 13 are aspherical surfaces, and the top surface 14 presents an annular surface having an inner diameter of D shape. The inner surface 12 is a reflecting surface, and the light emitted from the plurality of light emitting diode light sources 20 is reflected by the inner surface 12 and then emitted to the outside through the opening 11. The reflective cover 10 is made of a high thermal conductivity material such as metal. Thereby, the thermal radiation efficiency of the light-emitting-diode illuminating device 1 can be improved.

  The fixing portion 30 is installed in the vicinity of the opening 11 on the inner surface 12 of the reflective cover 10. In the present embodiment, the cross section of the fixed portion 30 has a substantially triangular shape.

  The plurality of light emitting diode light sources 20 are fixed to the inside of the top surface 14 of the reflective cover 10 by the fixing portion 30. The plurality of light emitting diode light sources 20 are installed symmetrically with respect to the axis OO ′. Each light-emitting diode light source 20 is closely affixed to the fixing portion 30, the bottom end thereof is in contact with the inner surface 12 of the reflective cover 10, and the top end extends obliquely toward the axis OO ′. Each light-emitting diode light source 20 includes a first surface 21 and a second surface 22 that face each other. In the present embodiment, the first surface 21 is a light emitting surface facing the inside of the reflective cover 10, and the depression angle between the first surface 21 and the plane formed by the top surface 14 of the reflective cover 10 is θ It is. The second surface 22 is tightly stuck on the fixed portion 30. In the present embodiment, the light emitting diode light source 20 is a light emitting diode package. When 0 ≦ θ ≦ 45 °, the light-emitting diode illuminating device 1 has a high luminous flux density and a relatively small light loss.

  Further, in order to control the light flux density of the light emitting diode illumination device 1, the number of the light emitting diode light sources 20 may be increased or decreased as appropriate. When the quantity of the light emitting diode light sources 20 is increased, the light flux density of the light emitting diode illumination device 1 is also increased. Thereby, the uniformity of the light radiate | emitted from the light emitting diode illuminating device 1 can be improved.

  Referring to FIG. 3, in the present embodiment, the cross section of the inner surface 12 of the reflective cover 10 exhibits a non-arc line, and this non-arc line satisfies the following Expression 1.

  Where ρ is the horizontal distance from the aspheric axis (axis OO ′), sag (ρ) is the vertical distance corresponding to ρ, r is the radius of curvature of the apex A of the aspheric surface, and c is The conic coefficient, d is a fourth-order aspherical correction coefficient. Preferably, −1 <c ≦ 0, −D / 2 ≦ ρ ≦ D / 2, and −0.1 ≦ d ≦ 0.1.

  FIG. 4 shows light emitting diode illumination when ρ = D / 2 = 37.5 mm, c = 0, r = 38 mm, and d = 0, the detection distance L = 1000 mm, and the sensor size is 2000 mm × 2000 mm. FIG. 4 is a light intensity effect diagram of the device 1. As can be seen from FIG. 4, the light intensity at the center of the sensor is significantly higher than the ambient light intensity.

  FIG. 5 shows a light emitting diode when ρ = D / 2 = 37.5 mm, c = −1, r = 1 mm, and d = 0, the detection distance L = 1000 mm, and the sensor size is 2000 mm × 2000 mm. It is a light intensity effect figure of the illuminating device 1. As can be seen from FIG. 5, the light intensity at the center of the sensor is significantly higher than the ambient light intensity. At this time, the light collection effect of the light-emitting diode illuminating device 1 is greatly improved. However, since there is a dark area in the center of the sensor, the light uniformity in the illuminated area is poor. Moreover, since the shape of the reflective cover 10 is too long, it is difficult to manufacture and the size cannot be reduced. Therefore, preferably, r satisfies the following formula 2.

Formula 2:
1 <r ≦ D

  Assuming that r> D, the light-collecting effect of the light-emitting diode illuminating device 1 is poor. Assuming that r <1, the top of the inner surface 12 of the reflective cover 10 is too sharp and the manufacturing difficulty is greatly increased.

  Compared with the prior art, in the light-emitting diode illuminating device 1 of the present invention, the light emitted from the plurality of light-emitting diode light sources 20 is reflected by the reflective cover 10 and then emitted to the outside. Thereby, the outstanding condensing effect can be acquired.

DESCRIPTION OF SYMBOLS 1 Light emitting diode illuminating device 10 Reflective cover 11 Opening 12 Inner surface 13 Outer surface 14 Top surface 20 Light emitting diode light source 21 First surface 22 Second surface 30 Fixed part

Claims (6)

  In a light-emitting diode illuminating device including a reflective cover and a plurality of light-emitting diode light sources provided in the reflective cover, the reflective cover includes an inner surface, an outer surface, and a top surface connecting the inner surface and the outer surface, An opening is formed in the top surface, the inner surface is a reflective surface, the plurality of light emitting diode light sources are installed near the inside of the top surface of the opening, and the light emitted from the light emitting diode light source is After being reflected by the inner surface, the light emitting diode illuminating device emits to the outside through the opening.   The inner surface and the outer surface are aspherical surfaces, the top surface is an annular surface, the reflective cover has an axisymmetric structure, the cross section of the reflective cover has a U-shape, and a plurality of light emission The diode light source is installed uniformly along the inside of the top surface, the bottom end of each light emitting diode light source is in contact with the inner surface of the reflective cover, and the top end of each light emitting diode light source is Each light-emitting diode light source extending obliquely toward the axis of symmetry has a first surface and a second surface facing each other, and the first surface is a light emitting surface facing the inside of the reflective cover. The light-emitting diode illuminating device according to claim 1.   3. The light emitting diode according to claim 1, wherein a depression angle between the first surface and a plane formed by the top surface of the reflective cover is θ and 0 ≦ θ ≦ 45 °. Lighting device. The cross section along the symmetry axis of the inner surface of the reflective cover exhibits a non-arc line, and the non-arc line satisfies the following expression (1): The light-emitting diode illuminating device described.
Where ρ is the horizontal distance from the aspheric axis, sag (ρ) is the vertical distance corresponding to ρ, r is the radius of curvature of the apex of the aspheric surface, c is the cone coefficient, and d is A fourth-order aspheric correction factor.   The inner diameter of the top surface is D, and -1 <c ≦ 0, −D / 2 ≦ ρ ≦ D / 2, and −0.1 ≦ d ≦ 0.1. Light emitting diode lighting device.   The light-emitting diode illuminating device according to claim 5, wherein 1 <r ≦ D.