Imaging optical system and endoscope provided with imaging...

Details Imaging optical system and endoscope provided with imaging... Imaging optical system and endoscope provided with imaging...

2011-03-29

2011-03-29

Le, Que T (Department: 2878)

Radiant energy

Photocells; circuits and apparatus

Photocell controlled circuit

C250S216000

Reexamination Certificate

active

07915572

ABSTRACT:
An imaging optical system includes a spherical or nearly spherical viewing port, an objective lens that includes an aspheric surface and is formed as a single lens element, and a solid-state image sensor that receives an image formed by the imaging optical system. Specified conditions are satisfied by the imaging optical system and the objective lens so that an in-focus image having low distortion, sufficient contrast, and formed by light rays of restricted angles of incidence is formed even for an object in contact with the viewing port. The specified conditions relate to features of the imaging optical system such as focal length and f-number of the imaging optical system, astigmatism and distortion of the imaging optical system, and pixel pitch of the solid-state image sensor. An endoscope that includes the imaging optical system is also disclosed.

REFERENCES:
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patent: 5576882 (1996-11-01), Kanamori
patent: 5598205 (1997-01-01), Nishioka
patent: 7331693 (2008-02-01), Fujisaki
patent: 7345829 (2008-03-01), Terashima et al.
patent: 2003/0002174 (2003-01-01), Dou
patent: 2003/0171648 (2003-09-01), Yokoi et al.

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