Active solid-state devices (e.g. – transistors – solid-state diode – Incoherent light emitter structure – With housing or contact structure
Reexamination Certificate
2002-11-25
2004-08-10
Crane, Sara (Department: 2811)
Active solid-state devices (e.g., transistors, solid-state diode
Incoherent light emitter structure
With housing or contact structure
C257S100000
Reexamination Certificate
active
06774406
ABSTRACT:
BACKGROUND OF THE INVENTION
The present invention relates to a light emitting diode (LED) device and to a method for manufacturing the LED device.
The LED is provided for emitting light of a predetermined color only. In order to produce an LED emitting desired color light, the LED is sealed by a resin in which fluorescent material or coloring agent is included.
FIG. 4
shows a conventional LED device provided for emitting desired color light.
The LED device
50
comprises a substrate
51
, first and second electrodes
52
and
53
secured on the substrate
51
, an LED
54
mounted on the substrate. The LED is connected to the electrodes
52
and
53
by wires
55
. The LED
54
and wires
55
are sealed by a transparent sealing resin
56
. In the sealing resin
56
, a fluorescent material consisting of YAG (yttrium, aluminum, gallium) and a coloring agent are included.
The LED
50
emits blue light. If the blue light strikes the fluorescent material in the sealing resin
56
, the blue light changes to yellow light which discharges from the sealing resin
56
. When the yellow light mixes with the blue light, white light discharges. If the white light strikes the coloring agent, the white light changes to a color of the coloring agent.
In the manufacturing process, the device is inserted in a cure furnace after the mixing of the fluorescent material with the resin, in order to solidify the resin. However, since the fluorescent material has a specific gravity heavier than that of the sealing resin
56
, the fluorescent material deposits in the resin. As a result, the fluorescent material is not uniformly diffused in the resin. Therefore, it is difficult to obtain an LED device emitting desired color light.
SUMMARY OF THE INVENTION
An object of the present invention is to provide an LED device which may discharge light of a desired color.
According to the present invention, there is provided a light emitting diode device comprising a body having a recess, the body comprising a pair of half bodies made of metal, an insulation layer provided between the half bodies, an LED provided on a bottom of the recess, connecting means for connecting the LED with the half bodies, a sealing resin for sealing the connecting means, a transparent coloring resin covering at least one surface of the LED, and a transparent sealing plate for closing the recess.
The recess is formed into an inverted truncated cone.
The transparent coloring resin includes a fluorescent material.
These and other objects and features of the present invention will become more apparent from the following detailed description with reference to the accompanying drawings.
REFERENCES:
patent: 6576930 (2003-06-01), Reeh et al.
patent: 6624491 (2003-09-01), Waitl et al.
Citizen Electronics Co. Ltd.
Crane Sara
Dennison Schultz Dougherty & MacDonald
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