Title:
OPTICAL SYSTEM AND ENDOSCOPE USING SAME
Document Type and Number:
WIPO Patent Application WO/2009/041332
Kind Code:
A1
Abstract:
An optical system and an endoscope using the same. At least one surface of a first
reflective surface (22) and a second reflective surface (23) is an extended rotation
free-form surface having no symmetry plane and formed by rotating an arbitrarily-shaped
line segment about a central axis (2). A light flux, which will enter a transparent
medium (L), forms an almost Z-shaped first optical path (A) by, in forward ray
tracing, entering the transparent medium (L) through an opening (S) and a first
transmissive surface (21), being reflected to the side opposite to an image surface
(5) by the first reflective surface (22), being reflected to the image surface
(5) side by the second reflective surface (23), and going out to the image surface
(5) side from the transparent medium (L) through a second transmissive surface
(24). At least a portion between the first reflective surface (22) and the second
reflective surface (23) of the first optical path (A) is formed on only one side
of the central axis (2). An image is formed in a ring shape on the image surface (5)
without an intermediate image being formed in the first optical path (A).
Inventors:
TOGINO TAKAYOSHI (JP)
Application Number:
PCT/JP2008/066794
Publication Date:
April 02, 2009
Filing Date:
September 08, 2008
Export Citation:
Assignee:
OLYMPUS CORP (JP)
TOGINO TAKAYOSHI (JP)
TOGINO TAKAYOSHI (JP)
International Classes:
G02B17/00; A61B1/00; G02B17/08; G02B23/24
Foreign References:
| JP2004361777A | 2004-12-24 | |||
| JP2004312593A | 2004-11-04 |
Attorney, Agent or Firm:
KOYAMA, Takashi et al. (Ueno Suzuki Bldg. 7th Floor16-3, Ueno 3-chom, Taito-ku Tokyo, JP)
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