Projection apparatus, ceiling hanging hardware for projection apparatus, and method of controlling operation of projection apparatus

#This application is based upon and claims the benefit of priority from prior Japanese Patent Application No. 2005-077243, filed Mar. 17, 2005, the entire contents of which are incorporated herein by reference.

#1. Field of the Invention

#The present invention specifically relates to a projection apparatus favorable for a projector fixed on a ceiling or the like, ceiling hanging hardware for the projection apparatus, and a method of controlling operation of the projection apparatus.

#The accompanying drawings, which are incorporated in and constitute a part of the specification, illustrate embodiments of the invention, and together with the general description given above and the detailed description of the embodiments given below, serve to explain the principles of the invention.

#FIGS. 1A and 1B are perspective views showing an outward appearance of a projector according to a first embodiment of the present invention;

#FIG. 2 is a block diagram of functional units of an electronic circuit of the projector according to the first embodiment of the present invention;

#A projector according to a first embodiment of the present invention will be described with reference to the accompanying drawings.

#FIGS. 1A and 1B illustrate an outward appearance of a projector 10 (main unit) according to the first embodiment. FIG. 1A chiefly shows the front and top of a casing 11 of the projector, and FIG. 1B shows the back and bottom of the casing 11. The casing 11 is a substantially rectangular parallelepiped.

#Referring to FIG. 1A, a projection lens 12 and an infrared (Ir) light-receiving unit 13 are provided on the front of the casing 11.