| 摘要 |
A diaphragm device for projector includes a first gear unit, a second gear unit and two diaphragm plates. The first gear unit includes a partial circular arc portion and a gear portion with partial no tooth. The second gear unit includes a circular arc portion corresponding to the partial circular arc portion, and a pinion and a gear corresponding to the gear portion with partial no tooth. When the partial circular arc portion abuts on the circular arc portion, the gear does not rotate. When the partial circular arc portion does not abut on the circular arc portion, the gear portion with partial no tooth meshes the gear to transmit rotation of the first gear unit to the gear. The two diaphragm plates each on which a rack meshing the pinion is formed, moves in directions opposed to each other according to rotation of the pinion.
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