Illumination – Plural light sources – With modifier
Reexamination Certificate
1998-11-25
2001-12-18
O'Shea, Sandra (Department: 2875)
Illumination
Plural light sources
With modifier
C362S227000, C362S235000, C362S236000
Reexamination Certificate
active
06331063
ABSTRACT:
BACKGROUND OF THE INVENTION
This invention relates to an LED luminaire formed with a plurality of light emitting diodes (LED) on a substrate.
DESCRIPTION OF RELATED ART
Conventionally, luminaires employing candescent lamp or luminescent lamp as light source have been radiating infrared and ultraviolet rays in addition to visible rays, and such other rays than the visible rays have been often affecting ill such objects irradiated as art objects, foodstuffs and so on. Further, in these luminaires, the light source, i.e., the lamp has its own life and is required to be exchanged for new one.
Recently, a light emitting diode (LED) of a high luminance has been suggested, and there have been used luminaires made not to radiate such harmful rays as the infrared, ultraviolet and the like rays, by means of such high luminance LED in a simple unit or, in particular, a modulation of a plurality of LED's mounted on an LED discrete substrate. These LED luminaires are advantageous in that the life is prolonged as compared with such light sources as the candescent and fluorescent lamps, the lamp exchange or the like maintenance is freed, and handling ability is excellent.
While the LED luminaires have such various advantages as in the above, they still have such drawbacks as will be referred to in the followings. That is, LED is of a single wavelength (single color) so as not to be able to obtain the white color, and LED is also strong in the directivity of light so that LED's of different wavelength (luminous color) and mounted on the same substrate as admixed will be unable to be mixed fully in their respective colors so as not to be able to easily obtain the white color light source but rather to cause, in particular, a shadow of the irradiated object to appear in rainbow colors. Accordingly, it is impossible to realize the delicate color difference between the white and daylight colors, as in the case of the luminaire employing the fluorescent lamp as the light source. Further, when LED's are mounted on the substrate at a high density, heat generation at the respective LED's will result in an elevated temperature, so as to render the luminous efficacy and luminance to be deteriorated, and the life of the respective LED's to be shortened. Since LED is large in its height dimension, further, it has been a remarkable trouble when the thinning of the device is intended.
For a related art of the kind referred to, a Japanese Utility Model Laid-Open Publication No. 4-92660 of Machida et al. discloses an LED luminaire in which LED's are arranged horizontally on a mounting plane of the substrate, with which arrangement, however, the light emitted by these LED's is limited only to be in vertical direction with respect to the mounting plane of the substrate, to be troublesome in the controllability of distribution of light. A Japanese Patent Laid-Open Publication No. 1-283883 of Ikeda discloses a resin molding of a substrate for mounting LED's but this substrate still has been unable to realize a desired control of the distribution of light.
SUMMARY OF THE INVENTION
An object of the present invention is to overcome the foregoing problems, and to provide an LED luminaire capable of easily attaining a desired distribution of light and of being thinned.
According to the present invention, this object can be realized by means of an LED luminaire comprising a substrate formed to have at least one of a plurality of dents and a plurality of protrusions, and a plurality of light emitting diodes disposed with respect to each of at least one of the plurality of the dents and a plurality of the protrusions.
Other objects and advantages of the present invention shall become clear as the description advances with reference to preferred embodiments of the invention shown in accompanying drawings.
REFERENCES:
patent: 4271408 (1981-06-01), Teshima et al.
patent: 4467193 (1984-08-01), Carroll
patent: 4935665 (1990-06-01), Murata
patent: 4975814 (1990-12-01), Schairer
patent: 5289082 (1994-02-01), Komoto
patent: 5515253 (1996-05-01), Sjoborn
patent: 5709453 (1998-01-01), Krent et al.
patent: 1-283883 (1989-11-01), None
patent: 4-92660 (1992-08-01), None
Akiniwa Taishi
Asahi Nobuyuki
Hashizume Jiro
Kamada Kazuo
Koyama Shoichi
Lynn & Lynn
Matsushita Electric & Works Ltd.
Negron Ismael
O'Shea Sandra
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