LED bulb and lighting apparatus
First Claim
1. An LED bulb comprising:
- an LED module;
a plurality of LEDs mounted on a surface of the LED module;
a heat dissipating unit having the LED module mounted thereon and configured to dissipate heat generated by the LEDs, the heat dissipating unit comprising a surface;
a globe-shaped cover covering the LED module and configured to externally pass through radiant light from the LEDs, the globe-shaped cover comprising an outer surface at a side adjacent to the heat dissipating unit;
a cap arranged on a side of the heat dissipating unit opposite to the globe-shaped cover, the cap comprising an inner hollow portion;
a lighting circuit disposed in the inner hollow portion of the cap, wherein the lighting circuit is configured to light the LEDs; and
a constricted portion provided at a junction between the heat dissipating unit and the globe-shaped cover and formed by the outer surface of the globe-shaped cover and a surface of a portion of the heat dissipating unit disposed outside of and adjacent to the globe-shaped cover such that both the outer surface of the globe-shaped cover and the surface of the portion of the heat dissipating unit have a reduced diameter compared to at least one other portion of the outer surface of the globe-shaped cover and at least one other portion of the surface of the heat dissipating unit, and wherein a diameter of a widest portion of the heat dissipating unit is greater than a diameter of the portion of the heat dissipating unit disposed outside of the globe-shaped cover and forming the junction.
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Accused Products
Abstract
An object of the present invention is to provide an LED bulb in which temperature of a lighting circuit is suppressed from rising during lighting of an LED so that life time of the lighting circuit is maintained without increasing manufacturing cost of components. According to the invention, an LED module 11 having multiple LEDs surface-mounted thereon is mounted in a heat dissipating unit 12. Heat generated by the LEDs is dissipated through multiple heat dissipating fins 18 of the heat dissipating unit 12. A glove 14, covering the LED module 11, radiates outward radiant light from the LEDs. A lighting circuit 17 for lighting the LEDs is incorporated in an inner hollow portion 23 of a cap 16 arranged on a side opposite to the glove 14 of the heat dissipating unit 12. Accordingly, the heat generated by the LEDs of the LED module 11 is mostly dissipated by the heat dissipating unit 12, thereby suppressing the temperature of the lighting circuit from rising.
88 Citations
8 Claims
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1. An LED bulb comprising:
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an LED module; a plurality of LEDs mounted on a surface of the LED module; a heat dissipating unit having the LED module mounted thereon and configured to dissipate heat generated by the LEDs, the heat dissipating unit comprising a surface; a globe-shaped cover covering the LED module and configured to externally pass through radiant light from the LEDs, the globe-shaped cover comprising an outer surface at a side adjacent to the heat dissipating unit; a cap arranged on a side of the heat dissipating unit opposite to the globe-shaped cover, the cap comprising an inner hollow portion; a lighting circuit disposed in the inner hollow portion of the cap, wherein the lighting circuit is configured to light the LEDs; and a constricted portion provided at a junction between the heat dissipating unit and the globe-shaped cover and formed by the outer surface of the globe-shaped cover and a surface of a portion of the heat dissipating unit disposed outside of and adjacent to the globe-shaped cover such that both the outer surface of the globe-shaped cover and the surface of the portion of the heat dissipating unit have a reduced diameter compared to at least one other portion of the outer surface of the globe-shaped cover and at least one other portion of the surface of the heat dissipating unit, and wherein a diameter of a widest portion of the heat dissipating unit is greater than a diameter of the portion of the heat dissipating unit disposed outside of the globe-shaped cover and forming the junction. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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Specification