Focal plane shutter and optical device
View Patent ↗A focal plane shutter includes: an electromagnet; a board including an opening; a blade movable between a position where the blade recedes from the opening and a position where the blade covers at least part of the opening; and a drive lever driving the blade, and including: a spindle portion provided at its one end with a flange portion; an iron piece provided at the other end of the spindle portion and capable of being adsorbed to the electromagnet; a support portion including a through hole through which the spindle portion penetrates with a play; and a guide portion provided along the iron piece.
1. A focal plane shutter comprising:
an electromagnet;
a board including an opening;
a blade movable between a position where the blade recedes from the opening and a position where the blade covers at least part of the opening; and
a drive lever driving the blade, and including:
a spindle portion provided at its one end with a flange portion;
an iron piece provided at the other end of the spindle portion and capable of being adsorbed to the electromagnet;
a support portion including a through hole through which the spindle portion penetrates with a play; and
a guide portion provided along the iron piece,
wherein the drive lever includes:
a first biasing member biasing the iron piece in an axial direction of the spindle portion; and
a second biasing member biasing the iron piece in a direction intersecting the axial direction such that the iron piece is urged against the guide portion; and
wherein the second biasing member does not contact the spindle portion.
2. The focal plane shutter of claim 1 , wherein the second biasing member has a plate shape.
3. The focal plan shutter of claim 2 , wherein the second biasing member is positioned between the spindle portion and the opening.
4. An optical device comprising a focal plane shutter, the focal plane shutter including:
an electromagnet;
a board including an opening;
a blade movable between a position where the blade recedes from the opening and a position where the blade covers at least part of the opening; and
a drive lever driving the blade, and including:
a spindle portion provided at its one end with a flange portion;
an iron piece provided at the other end of the spindle portion and capable of being adsorbed to the electromagnet;
a support portion including a through hole through which the spindle portion penetrates with a play; and
a guide portion provided along the iron piece,
wherein the drive lever includes:
a first biasing member biasing the iron piece in an axial direction of the spindle portion; and
a second biasing member biasing the iron piece in a direction intersecting the axial direction such that the iron piece is urged against the guide portion; and
wherein the second biasing member does not contact the spindle portion.