US 6,474,836 B1 · Light source and original reading device

Abstract

A light source and an original reading device are provided in which light can be emitted uniformly and with a low loss of light amount, by a minimum required number of light emitting elements. A surface of a substrate, at which surface LED elements are disposed, is covered with a resist film having high reflectance, such as a white resist film. Light emitted toward the substrate from the LED elements is reflected toward a photographic film (toward a side of the LED elements opposite a substrate side of the LED elements). In this way, at an LED light source, almost all of light emitted from the LED elements can be emitted toward the photographic film. A diffusion box is disposed so as to surround a periphery of the LED light source. Due to a light reflection diffusion plate of the diffusion box, light, which is emitted from the LED light source and enters into the diffusion box, is guided toward the photographic film while being diffused and reflected. In this way, the light is guided while being collected, without a loss in an amount of light incident from the LED light source. Non-uniformity of a light amount distribution can be corrected even more (non-uniformity of a light amount can be reduced).

Claims16

Dependent claims

An original reading device comprising:

a light source structured by a plurality of light-emitting elements being connected to predetermined positions of a wiring pattern formed in advance on a substrate, said light source including a reflecting member provided at a position of the substrate other than positions at which the plurality of light-emitting elements are disposed on the substrate, said reflecting member having a reflectance which is higher than a reflectance of the substrate, wherein light from the light source is illuminated onto an original, and one of a transmitted image and a reflected image is read by photoelectric converting elements.

Dependencies are inferred from the claim text.

Light source and original reading device

Life of this patent

Light source and original reading device

Life of this patent

Abstract

Claims16