Patent ID: 8520284

Claim:
A diaphragm device for projector comprising: a first gear unit that includes a partial circular arc portion and a gear portion with partial no tooth; a second gear unit that includes a circular arc portion on which concave circular arcs are formed along a circumferential direction thereof corresponding to the partial circular arc portion of the first gear unit, and a pinion and a gear corresponding to the gear portion with partial no tooth of the first gear unit, wherein when the partial circular arc portion of the first gear unit abuts on the circular arc portion, the gear does not rotate even if the first gear unit rotates, and when the partial circular arc portion of the first gear unit does not abut on the circular arc portion, the gear portion with partial no tooth of the first gear unit meshes the gear to transmit rotation of the first gear unit to the gear; and two diaphragm plates each on which a rack that meshes the pinion of the second gear unit is formed at a part thereof, that moves in directions opposed to each other according to rotation of the pinion of the second gear unit.