Title:
OPTICAL SYSTEM
Document Type and Number:
WIPO Patent Application WO/2008/075529
Kind Code:
A1
Abstract:
A small-sized optical system for shooting an image having a 360° omnidirectional
angle of filed without adversely influenced by the flare light and a high resolution
or projecting an image at a 360° omnidirectional angle of filed. The optical
system has a front group (10) including two reflective surfaces and two transmissive
surfaces all being rotationally symmetrical with respect to the center axis
(1), a rear group (20) being rotationally symmetrical with respect to the center
axis and having a positive power, and an aperture (5) coaxial with the center axis.
A light beam entering the front group travels through a first transmissive surface
(11), is reflected by a first reflective surface (12) provided on the opposite
side to the first transmissive surface with the center axis interposed toward
the opposite side to the image plane, reflected by a second reflective surface
(13) disposed on the same side as the first transmissive surface toward the image
plane, exits outside from a transparent medium through a second transmissive
surface (14), travels through the rear group (20), and focused onto an image plane
(30). The entrance pupil (6Y) in the cross-section including the center axis
(1) is disposed near the second reflective surface (13).
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Inventors:
TOGINO TAKAYOSHI (JP)
Application Number:
PCT/JP2007/072598
Publication Date:
June 26, 2008
Filing Date:
November 15, 2007
Export Citation:
Assignee:
OLYMPUS CORP (JP)
TOGINO TAKAYOSHI (JP)
TOGINO TAKAYOSHI (JP)
International Classes:
G02B17/08; G02B13/06; G02B13/18; G03B21/00; G03B37/00
Foreign References:
| JP2006292814A | 2006-10-26 | |||
| JP2006243689A | 2006-09-14 |
Attorney, Agent or Firm:
NIRASAWA, Hiroshi et al. (Ueno-Suzuki Bldg. 7th Floor16-3, Ueno 3-Chome, Taito-K, Tokyo 05, JP)
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