Patent ID: 8467138
Filing Date: 2013-06-18
Classification: A61B,G02B

Abstract:
1. An optical element, wherein the optical element is provided with a first surface which is formed on a front-object side and through which light from the front-object side enters, a second surface which is formed on an image side, and a third surface which is formed between the first and second surfaces and through which light from an approximately-lateral-object side enters, the first surface is provided with a first transmission surface which is formed with a center of the first transmission surface being on an optical axis and a first reflection surface which faces toward the image side and is formed around the first transmission surface and in the shape of a ring, and the second surface is provided with a second transmission surface which is formed with a center of the second transmission surface being on the optical axis and a second reflection surface which faces toward the front-object side and is formed around the second transmission surface and in the shape of a ring.