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AssigneeIwasaki Electric Co., Ltd.
InventorsMitsuyuki Hatanaka, Takashi Satou, Nozomu Kajiwara, Takaaki Komiya
Estimating the term…
In a light converging type light guide unit for guiding light emitted from a light source to a light-receiving member having a reflection face extending from a light emission point to at least a place in the neighborhood of a light reception point of the light-receiving member, the reflection face has first and second focal points at which the light emission and reception points are disposed, respectively, and comprises an elliptical reflection face at the side of the light reception point, and a curved surface reflection face that is provided at the side of the light emission point, reflects light of the light source therefrom to the elliptical reflection face and obtains light that travels to the light reception point and is incident to the light reception point at a predetermined incidence angle or less by reflection from the elliptical reflection face.
A light converging type light guide unit for guiding light emitted from a light source to a light-receiving member having a reflection face extending from a light emission point of the light source to at least a place in the neighborhood of a light reception point of the light-receiving member, wherein the reflection face has a first focal point at which the light emission point is disposed and a second focal point at which the light reception point is disposed, and comprises an elliptical reflection face at the light reception point side, and a curved surface reflection face that is provided at the light emission point side and configured to reflect light of the light source therefrom to the elliptical reflection face and obtain light that travels to the light reception point and is incident to the light reception point at a predetermined incidence angle or less by reflection from the elliptical reflection face.
Dependencies are inferred from the claim text.