Light-emitting unit and illumination device and image reading device using light-emitting unit
First Claim
1. A light-emitting unit having a light-emitting device mounted on a light-emitting unit board which is provided with a lead frame, wherein the lead frame is made of a copper alloy or an aluminum alloy of which the heat conductivity is 250 W/(m·
- K) or more.
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Accused Products
Abstract
A light-emitting unit 20 has a light-emitting unit board 21 made of resin provided with a lead frame 22. The light-emitting unit board 21 is also provided with an open window 21a for mounting a light-emitting device. The lead frame 22 comprises a lead terminal section 22a, an inner lead section 22c, and a light-emitting device mounting and connecting section 22b which is exposed within the open window 21a. The light-emitting devices 23a, 23b, and 23c are bonded with the light-emitting device mounting and connecting section 22b, and electrodes of the light-emitting devices and the lead frame are connected by a metal wire 24, wherein the open window 21a is sealed by transparent resin. The lead frame 22 is made of iron-containing copper to improve heat radiation performance of the light-emitting unit board. By increasing maximum current to be supplied to the light-emitting diodes, it is possible to increase illumination brightness and to attain speedup of image reading.
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Citations
10 Claims
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1. A light-emitting unit having a light-emitting device mounted on a light-emitting unit board which is provided with a lead frame, wherein the lead frame is made of a copper alloy or an aluminum alloy of which the heat conductivity is 250 W/(m·
- K) or more.
- View Dependent Claims (2, 5, 6, 7, 8)
- 3. A light-emitting unit having a light-emitting device mounted on a light-emitting unit board which is provided with a lead frame, wherein the light-emitting unit board is made of resin of which the heat resistant temperature is higher than a melting point of lead-free solder which is used when the lead frame is soldered onto an electric circuit.
Specification