Title:
LIGHT QUANTITY CONTROL DEVICE
Document Type and Number:
WIPO Patent Application WO/2008/032518
Kind Code:
A1
Abstract:
A light quantity control device (1) has a bottom board (60) having an optical path
opening (61), a first vane (20), an auxiliary vane (30), and a second vane (50)
that move in the directions opposite to each other to control the quantity of light
passing through the optical path opening (61), and a drive lever (70) connected
to the pair of the vanes and driving them when it rotates. When the pair of the vanes
adjust the optical path opening (61) to a predetermined passing quantity of light,
the drive lever (70) is positioned within an angle of 90° about a virtual
line (A) passing through the center of the rotation of the drive lever (70) and
in parallel with the moving direction of the vanes.
Inventors:
NUMNUAL PHICHET (TH)
NAKANO TAKASHI (JP)
MIKAMI MAKOTO (JP)
NAKANO TAKASHI (JP)
MIKAMI MAKOTO (JP)
Application Number:
PCT/JP2007/065938
Publication Date:
March 20, 2008
Filing Date:
August 16, 2007
Export Citation:
Assignee:
SEIKO PRECISION KK (JP)
NUMNUAL PHICHET (TH)
NAKANO TAKASHI (JP)
MIKAMI MAKOTO (JP)
NUMNUAL PHICHET (TH)
NAKANO TAKASHI (JP)
MIKAMI MAKOTO (JP)
International Classes:
G03B9/02
Foreign References:
| JPH11194384A | 1999-07-21 | |||
| JPH11194387A | 1999-07-21 | |||
| JP2004109531A | 2004-04-08 | |||
| JP2007233054A | 2007-09-13 |
Attorney, Agent or Firm:
KATAYAMA, Shuhei (6-1 Kyobashi 1-chome,Chuo-ku, Tokyo 31, JP)
Download PDF: