| 摘要 |
PROBLEM TO BE SOLVED: To provide an optical system which is capable of imaging both of an object point on a center axis and an omnidirectional image in the direction substantially vertical to the center axis simultaneously onto one image pickup device with a simple constitution, is miniaturized and is inexpensive, and to provide an endoscope using the optical system. SOLUTION: The optical system comprises: a direct view optical path B which images or projects the object point on the center axis 2; and a side view optical path A which performs internal reflections of at least two times in an annular optical device, uses a part of the direct view optical path B and forms the omnidirectional annular image on the outer circumference of a circular image of the direct view optical path B on the same image pickup device or image display device. COPYRIGHT: (C)2009,JPO&INPIT
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