Patent ID: 8317418

Claim:
A focal plane shutter comprising: a front curtain assembly comprising two or more front curtain links and two or more front curtain blades, wherein bosses are formed at one of the front curtain links and the front curtain blades, holes are formed in the remaining one of the front contain links and the front curtain blades, and the bosses are inserted into the holes; and a rear curtain assembly comprising two or more rear curtain links and two or more rear curtain blades, wherein bosses are formed at one of the rear curtain links and the rear curtain blades, holes are formed in the remaining one of the rear curtain links and the rear curtain blades, and the bosses are inserted into the holes, wherein at least one of the front curtain blades comprises a front curtain escape groove formed to avoid a path along which the bosses of the front curtain assembly moves while the front curtain links are rotating, and at least one of the rear curtain blades comprises a rear curtain escape groove formed to avoid a path along which the bosses of the rear curtain assembly moves while the rear curtain links are rotating.