Patent ID: 7997810

Claim:
A focal plane shutter for a camera, comprising: a shutter base plate having an opening for an imaging optical path, at least one shutter blade group being disposed between the shutter base plate and an auxiliary base plate; a support plate disposed at a side of the opening such that a plate surface of the support plate is parallel to the shutter base plate, the support plate being attached to the shutter base plate with a predetermined space provided between the support plate and the shutter base plate; a printed wiring board stacked on the support plate; at least one driving member disposed in the space and rotating to operate the shutter blade group; an adjusting shaft member formed of an insulating material and including an attachment portion that is rotatably attached to the support plate and first and second shaft portions arranged along an axial direction of a rotation axis of the attachment member, a peripheral surface of one of the first and second shaft portions being formed as a circular peripheral surface centered on the rotation axis and a peripheral surface of the other one of the first and second shaft portions being formed as a cam surface such that a distance from the rotation axis to the cam surface varies; a first contact member that is bonded to the printed wiring board at one end and that has a free end at the other end, the first contact member including, at positions near the free end, a contact portion and a positioning portion that comes into contact with and moves away from the peripheral surface of the first shaft portion and having a function of causing the positioning portion to come into contact with the peripheral surface of the first shaft portion by elasticity of the first contact member; and a second contact member that is bonded to the printed wiring board at one end and that has a free end at the other end, the second contact member including a pushing portion at a position between the ends and, at positions near the free end, a contact portion and a positioning portion that comes into contact with and moves away from the peripheral surface of the second shaft portion and having a function of causing the positioning portion to come into contact with the peripheral surface of the second shaft portion by elasticity of the second contact member, the second contact member causing the contact portion of the second contact member to come into contact with the contact portion of the first contact member and causing the positioning portion of the first contact member to move away from the peripheral surface of the first shaft portion when the pushing portion is pushed by the driving member, wherein a time at which the contact portions of the first and second contact members come into contact with each other is adjustable by rotating the adjusting shaft member.