JP2009245910A - Long-distance reaching led luminaire - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an optical means used for efficiently condensing light diffusing to surroundings from an LED chip by a reflector and a condensing lens, and condensing it on a desired spot, at desired illuminance, suitable for the size of an object located in a distant location. <P>SOLUTION: The LED chip is arranged by being brought close to a vertex of a lens having one end having directivity in a light-emitting direction and formed in to a nearly conical shape; the distance of an irradiation object and the size of an illumination spot are allowed to be optionally set by changing the vertex of the circular cone; light that is about to diffuse more than a lens diameter is contained by a cylinder arranged adjacent to a light emission side of the lens and having a cavity in its inside, and guided to an object located in a long distance; a reflector is arranged to surround the lens; light that cannot be condensed by the lens is captured, and reflected and refracted in a predetermined direction; and thereby light emission efficiency is improved. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention seeks to realize a long-range reaching luminaire using LEDs. An LED is a point light source, and in order to make a predetermined area of an object have a predetermined illuminance, a technique for efficiently condensing the light of the LED chip and converging it on the object without waste is required. It is for realization.

Conventional long-distance lighting fixtures mainly use high-luminance, large-capacity metal halide lamps, etc., but power consumption is 1 to meet the current pressing need for CO ₂ reduction. Development of lighting fixtures using LEDs that can be reduced from / 6 to 1/10 is essential.

When trying to illuminate an object at a long distance using an LED, the light flux from the LED chip that is a point light source is efficiently condensed and converged to a spot that matches the size of the object at a distance. In a configuration that uses a conventional single condenser lens, a reflector or a light distribution lens, but nothing is placed between the LED chip, the light from the LED chip diffuses beyond the desired optical path. However, since the illuminance decreases almost in proportion to the square of the distance, it is impossible to realize the long distance reaching illumination.
JP2008-16341 JP2007-80866 JP 2006-24381 A

  The present invention seeks to realize a long-range reaching luminaire using LEDs. For this purpose, the light diffused from the LED chip 2 to the periphery is efficiently condensed by a lens 5 (hereinafter referred to as a lens) having one end face shaped in a substantially conical shape having directivity in the light emission direction. A cylinder that is close to the side end face and is hollow inside, contains light that is collected by the lens 5 and diffused to the outside, guides it to the object, and light that cannot be captured by the lens. It is necessary to develop an optical means for converging light to a desired position and range of an object far away, such as supplementing with the reflector 3 and reflecting or refracting it in a predetermined direction.

  In the present invention, the LED chip 2 is arranged close to the apex of the lens 5 (hereinafter referred to as a lens), and the apex angle of the cone is changed so that the distance of the irradiation target and the size of the illumination spot can be arbitrarily set. .

  Further, the reflector 3 is disposed so as to surround the lens 5, the light that cannot be captured by the lens 5 is captured, and the light is emitted while being reflected and refracted in a predetermined direction, thereby improving the light output efficiency.

  Moreover, it is a cylinder that is close to the light exit side end face of the lens 3 and has a hollow inside, and confines the light that is collected by the lens 5 and diffuses to the outside and guides it to the object.

  Further, a light-transmitting plate 4 or a Fresnel lens 4 having a hollow cylinder (hereinafter referred to as a cylinder) inside and an opening diameter approximately equal to the outer diameter of the cylinder and an outer shape approximately equal to the outer shape of the reflector 3 are provided on the end face on the light output side of the lens 5. The positional relationship between the LED chip 2 and the lens 5 can be determined by assembling the reflector 3 so as to close it.

  Further, the light transmitting plate 4 or the Fresnel lens 4 and the reflector 3 are provided with positioning protrusions or recesses (FIG. 2), and the two are engaged with each other, so that the positional relationship between the LED chip 2 and the lens 5 can be obtained without auxiliary means. I was able to confirm.

  Further, by using the positioning guide plate 6 (FIG. 3) and arranging a plurality of single lighting fixtures, it is possible to realize a lighting fixture suitable for the required reach distance, illuminance, spot area, and the like.

In the present invention, the LED chip 2 is arranged close to the apex of the lens 5 and the apex angle of the substantially cone is changed, whereby the distance of the irradiation target and the size of the illumination spot can be arbitrarily set. Further, the light that could not be captured by the lens 5 is captured by the reflector 3 disposed so as to surround the lens 5 and is emitted while being reflected and refracted in a predetermined direction, so that the light output efficiency is remarkably improved.
A translucent plate 4 or a Fresnel lens 4 having an opening diameter that is substantially equal to the outer diameter of the cylinder and the cylinder and an outer shape that is approximately equal to the outer shape of the reflector 3 is assembled so as to block the reflector 3 in contact with the end surface on the light output side of the lens 5. However, it is possible to determine the positional relationship between the LED chip 2 and the lens 5 without auxiliary means by providing positioning projections or depressions on the light transmitting plate 4 or the Fresnel lens 4 and the reflector 3 and engaging them together. I can do it.

FIG. 1 shows an embodiment of the present invention. The LED chip 2 is mounted on a substrate 1 having good heat dissipation such as an aluminum substrate via an insulating film. A lens 5 formed in a substantially conical shape with one end face having directivity in the light emitting direction is disposed close to the LED chip 2, and the distance between the LED chip 2 and the lens 5 or the apex angle of the substantially conical shape is changed. Thus, it can be arbitrarily set according to the distance of the irradiation target and the size of the illumination spot. Further, light that cannot be captured by the lens is captured by the reflector 3 arranged so as to surround the lens, and is emitted while being reflected and refracted in a predetermined direction, so that the light output efficiency is remarkably improved.
In order to determine the positional relationship between the LED chip 2 and the lens, a translucent plate 4 or a Fresnel lens having an opening diameter approximately equal to the outer diameter of the cylinder and the cylinder and an outer shape approximately equal to the outer shape of the reflector 3 on the light output side of the lens 5. 4 is assembled so as to block the reflector 3. At that time, as shown in FIG. 2, the LED chip 2 and the lens 5 are formed by providing positioning projections or depressions (enlarged view) on the light transmitting plate 4 or the Fresnel lens 4 and the reflector 3 and engaging them. Can be determined without auxiliary means.

  1 shows the main component configuration of a long range LED lighting fixture according to the present invention.   Fig. 3 shows an assembly diagram of the main parts of a long range LED lighting fixture according to the present invention.   1 shows a configuration of a composite far reaching LED luminaire according to the present invention.

Explanation of symbols

1 Aluminum substrate 2 LED chip 3 Reflector 4 Translucent plate or Fresnel lens 5 Lens 6 Guide plate

Claims (10)

  An LED illuminator characterized in that an LED chip is disposed in the vicinity of the apex of a lens (hereinafter referred to as a lens) whose one end face has a directivity in the light emission direction and is formed in a substantially conical shape.   2. The LED lighting device according to claim 1, wherein an end face on the light output side of the lens is in contact with a hollow cylinder (hereinafter referred to as a cylinder) while maintaining a substantially concentric positional relationship. Instruments.   The LED lighting apparatus according to claim 2, wherein the lens and the cylinder are integrally formed.   4. The lighting apparatus according to claim 2, wherein a reflector is disposed so as to surround the LED chip, the lens, and the cylinder.   5. The lighting fixture according to claim 4, wherein the reflecting surface of the reflector is a slope, a paraboloid or an ellipsoid.   5. The LED lighting apparatus according to claim 4, wherein the light exit side end face has positioning protrusions or depressions.   A transparent flat plate or a Fresnel lens having an opening diameter approximately equal to the outer diameter of the cylinder and an outer shape approximately equal to the outer shape of the reflector is assembled to the end surface opposite to the side in contact with the lens so as to block the reflector. LED luminaire characterized by comprising   8. The LED lighting apparatus according to claim 7, wherein the cylinder and a transparent flat plate or a Fresnel lens are integrally formed.   8. The LED lighting apparatus according to claim 6, wherein the transparent flat plate or the Fresnel lens has positioning protrusions or depressions.   An LED luminaire comprising a plurality of the luminaires according to claim 1 to 9.

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