Title:
OPTICAL SYSTEM FOR HARD MIRROR
Document Type and Number:
WIPO Patent Application WO/2017/203926
Kind Code:
A1
Abstract:
To protect an optical element from impact while preventing imprinting of dust or bubbles onto an image. Provided is an optical system 1 for a hard mirror, provided with one or more composite members (5) configured of two glass optical elements (2, 3) provided in a hard mirror and a transparent member (4) comprising an elastic material sandwiched between the optical element (2, 3) so as to be in at least partial contact. The optical system 1 for a hard mirror transmits an image from the distal end to the rear end at an approximately equal magnification, and satisfies conditional expression (1). l' > 30b•l/d (1) where: l' is the distance between the image and the interface on the side closer to the image from among the two interfaces between the transparent member (4) and the optical elements (2, 3); d is the radius of the pupil; l is the distance between the image and the pupil; and b is the maximum radius of bubbles present in the composite member 5.
Inventors:
INOUE TAKAHIRO (JP)
Application Number:
PCT/JP2017/016539
Publication Date:
November 30, 2017
Filing Date:
April 26, 2017
Export Citation:
Assignee:
OLYMPUS CORP (JP)
International Classes:
G02B13/26; A61B1/00; G02B23/26
Foreign References:
| US20080183042A1 | 2008-07-31 | |||
| JPS62279309A | 1987-12-04 | |||
| JPS55147003U | 1980-10-22 | |||
| JPH0894928A | 1996-04-12 |
Attorney, Agent or Firm:
UEDA, Kunio et al. (JP)
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