Patent ID: 6847497

Claim:
A wide-angle imaging device, comprising: a first reflection mirror having a reflection surface of an approximately ±90-degree convex shape around a rotation center axis of a rotary symmetrical body with respect to a reference optical axis direction; and an imaging device having a principle point of an image forming lens on a rotation center axis of the first reflection mirror, having an optical axis deviated from the rotation center axis of the first reflection mirror, forming an image of a reflection beam from the first reflection mirror, and imaging an object within approximately ±90 degrees around the rotation center axis of the first reflection mirror, wherein the first reflection mirror is a hyperboloid in shape having an internal focus on the rotation center axis, a position of an external focus of the hyperboloid and a position of the principle point of the image forming lens of the imaging device substantially coincide with each other, and when the imaging device has an angle field of 2α, an angle of about α is formed between the optical axis of the imaging device and the rotation center axis of the first reflection mirror, and the imaging device has an imaging surface that is rectangle and has a long side and a short side, the rotation axis center of the first reflection mirror forms an image substantially on a midpoint of the long side of the imaging surface, and a semicircular reflection beam from the first reflection mirror has a diameter equal to the long side of the imaging surface.