US Patent No. 9,906,699

BLADE DRIVE DEVICE AND OPTICAL APPARATUS


Patent No. 9,906,699
Issue Date February 27, 2018
Title Blade Drive Device And Optical Apparatus
Inventorship Koichi Masuzawa, Matsudo (JP)
Kenichi Kudo, Matsudo (JP)
Assignee SEIKO PRECISION INC., Chiba (JP)

Claim of US Patent No. 9,906,699

1. A blade drive device comprising:
a shallow base frame having an outer peripheral wall, a bottom surface, an opening formed in the bottom surface and an inner
peripheral wall standing along a periphery of the opening, the opening being configured to be opened and closed by a blade,
wherein

an optical axis runs through the opening perpendicularly to the bottom surface,
the outer and inner peripheral walls stand from the bottom surface in an outer direction along the optical axis, and
the base frame is formed therein with a substrate chamber defined by the outer and inner peripheral walls;
a first blade receiving plate placed in the base frame in parallel with the bottom surface at a first distance measured in
the outer direction from the bottom surface;

a second blade receiving plate placed in the base frame in parallel with the bottom surface at a distance measured in the
outer direction from the first blade receiving plate, wherein the blade is movable in a space formed between the first and
second blade receiving plates;

a pillar standing in the outer direction from the bottom surface in the substrate chamber and configured to position the first
blade receiving plate at the first distance from the bottom surface;

a substrate placed in the substrate chamber of the base frame between the bottom surface of the base frame and the first blade
receiving plate, wherein the substrate has a joint portion to which a conductor wire of a drive source that drives the blade
is joined;

a covering material layered on the substrate in the substrate chamber so that the covering material covers the joint portion;
and

a step formed to extend in parallel with the bottom surface at least one of (i) around a circumferential surface of the pillar
or (ii) along an inner surface of the outer peripheral wall defining the substrate chamber, the step being formed at a second
distance measured in the outer direction from the bottom surface, the second distance being shorter than the first distance,
wherein the covering material has an outer edge standing from the bottom surface in the outer direction, and the step terminates
the outer edge of the covering material at the second distance from the bottom surface.