Patent ID: 6939026

Claim:
A framing shutter assembly for a luminaire providing a beam of light, said framing shutter assembly comprising: a stack of plates having aligned central openings defining a light path through the shutter assembly, said light path having a longitudinal axis, a plurality of said plates being mounted for rotation relative to one another around said axis; a shutter blade; a first of said plurality of plates being a rotation guide plate having a guide slot extending from said central opening of said rotation guide plate, said guide slot receiving said shutter blade and mounting said shutter blade for translational motion into and out of said central opening of said first plate for selectively blocking a portion of said light path; a second of said plurality of plates being a translation guide plate; and a cam and follower combination including a first camming element on said translation guide plate and a second camming element on said shutter blade engaging said first camming element and moving said shutter blade along said guide slot in response to rotation of said translation guide plate relative to said rotation guide plate.