Focal-plane shutter and optical device

摘要

A focal-plane shutter includes: a board including an opening; a shutter opening and closing the opening; a drive lever provided with a drive pin and swinging; a drive arm provided with an engagement hole engaged with the drive pin, swinging about a center same as a swing center of the drive lever, driving the shutter, and made of a synthetic resin; and a restriction portion defining a swinging range of the drive lever.

主权项

1. A focal-plane shutter comprising:
a board including an opening; a shutter opening and closing the opening; a drive lever provided with a drive pin and swinging; a drive arm provided with an engagement hole engaged with the drive pin, swinging about a center same as a swing center of the drive lever, driving the shutter, and made of a synthetic resin; and a restriction portion defining a swinging range of the drive lever, wherein the engagement hole includes:
a first edge portion at a start end side from which the drive lever moves in a predetermined direction; anda second edge portion at a terminal end side to which the drive lever moves in the predetermined direction, the drive pin includes first and second side surfaces respectively capable of abutting the first edge portion and the second edge portion, and the first edge portion and the first side surface are not parallel to or perpendicular to any one of virtual lines capable of passing from the swing center to the drive pin when viewed in an axial direction of the swing center.