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US 6,476,369 B1Granted
Linear light source with increased light efficiency and uniform exposure, and image sensor using the linear light source
AssigneeMitsubishi Denki Kabushiki Kaisha
InventorToshio Matsumoto
Life of this patent
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Abstract
A linear light source is provided in which surface mounting type LED chips are arranged linearly on a circuit board. Each LED chip is given a light condensing function. The ratio between the arrangement interval of the adjacent LED chips and the distance from the LED chip to an exposure surface is determined according to the directivity characteristic of each LED chip and the following equation: L(θ)=L(0°)/(2·cos2θ) where L(θ) is exposure at an angle θ, and θ is an angle with respect to a perpendicular to the exposure surface from a LED chip.
Claims7
A linear light source comprising:
- a circuit board;
- and
- a plurality of LED chips arranged linearly on said circuit board, each of said LED chips having a light condensing function built into the chip, wherein said plurality of LED chips are arranged so as to maximize efficiency of usage of light emitted by said LED chips while maintaining a uniform light exposure profile for said linear arrangement.
Dependencies are inferred from the claim text.