Mirror brake mechanism of an SLR camera

A mirror brake mechanism of an SLR camera for applying a brake to a mirror pivoted about a mirror rotational shaft to be swingable between a viewing position, in which light traveling from a photographing optical system is incident on said mirror and reflected toward a viewfinder optical system, and a retracted position, in which the light traveling from said photographing optical system is incident on an image sensor without being reflected by said mirror, said mirror brake mechanism comprising:

• a brake shaft which is independent of said mirror rotational shaft and positionally aligned along an extension line of said mirror rotational shaft;
• an interlocking rotating member disposed on one of laterally opposite sides of said mirror and rotatable about said brake shaft;
• a mirror drive shaft which connects a mirror seat, on which said mirror is mounted, and said interlocking rotating member to each other, said mirror drive shaft configured to allow said mirror seat and said interlocking rotating member to rotate around an axis of said brake shaft;
• a brake drum which rotates in association with said interlocking rotating member;
• and
• a mirror brake member which is brought into contact with and disengaged from said brake drum.