US Patent No. 9,904,145

BLADE DRIVE DEVICE AND OPTICAL INSTRUMENT


Patent No. 9,904,145
Issue Date February 27, 2018
Title Blade Drive Device And Optical Instrument
Inventorship Yoichi Nakano, Matsudo (JP)
Assignee SEIKO PRECISION INC., Chiba (JP)

Claim of US Patent No. 9,904,145

1. A blade drive device comprising:
a substrate that has an opening;
a first curtain and a second curtain that are movable along an opening surface of the opening so as to open and close the
opening;

a first locking portion that interlocks with opening and closing operations of at least the first curtain;
a blade position holding member that is configured to be pivotally movable around a first axis extending in a first direction
intersecting the opening surface, that enters an operation trajectory of the first locking portion in response to the opening
and closing operations of the first curtain, and that is capable of entry and escape between an entry position for regulating
the movement of the first curtain in a closing direction and an escape position escaped from the operation trajectory;

an electromagnetic actuator that extends in the first direction, and that is configured to be rotatable around a second axis
which is different from the first axis; and

a linkage lever that connects the blade position holding member and the electromagnetic actuator to each other, and that causes
the blade position holding member to pivot around the first axis in response to the rotation around the second axis of the
electromagnetic actuator,

wherein the blade position holding member and the linkage lever engage with each other while being provided with play in a
pivoting direction around the second axis of the linkage lever.