Patent ID: 8974063
Filing Date: 2015-03-10
Classification: G03B

Abstract:
1. An exhaust port shutter apparatus which is attached to an exhaust port of a projector, comprising: a guide section in which a plurality of sets of guide grooves, each being formed of a first guide groove extending in a first direction and a second guide groove extending in a direction intersecting the first direction, are provided; a plurality of louver boards each having a turning shaft pin and a guide pin provided with a predetermined space left between the turning shaft pin and the guide pin, the plurality of louver boards being provided in such a way that each turning shaft pin is guided by the first guide groove of the corresponding set and each guide pin is guided by the second guide groove of the corresponding set, the plurality of louver boards in which each turning shaft pin is formed so as to have a length which allows the turning shaft pin to pass through the first guide groove and project to the outside of the guide section; a cam roller that is placed so as to be rotatable about an axis line and has a plurality of cam grooves on a peripheral surface thereof, the cam roller that can reciprocate, by rotation thereof, each turning shaft pin by the plurality of cam grooves along the first guide groove in the first direction; a drive section that drives and rotates the cam roller, a photosensor that is provided on the guide section and detects whether the louver boards are in a closed state or an open state; and a shielding plate that is provided at the end of the cam roller that turns the photosensor on and off, wherein