WIDE-ANGLE IMAGING OPTICAL SYSTEM, AND WIDE-ANGLE IMAGING DEVICE, MONITORING IMAGING DEVICE, ON-VEHICLE IMAGING DEVICE, AND PROJECTION DEVICE WITH THE WIDE-ANGLE IMAGING OPTICAL SYSTEM

摘要

A wide-angle imaging optical system, comprising a dioptric system (3), a catoptric system, and an imaging optical system (5), the catoptric system further comprising a first reflecting surface (1) directly reflecting luminous flux from an object and a second reflecting surface (2) reflecting luminous flux from the first reflecting surface (1), wherein an opening part allowing luminous flux from the object to be injected therein is formed between the first reflecting surface (1) and the second reflecting surface (2), and a light transmitting part (2a) is formed in the second reflecting surface (2) for transmitting luminous flux injected into the dioptric system (3) therethrough and an opening (1a) is formed in the first reflecting surface (1) for injecting luminous flux from the second reflecting surface (2) and luminous flux from the dioptric system (3) into the imaging optical system (5).