Patent ID: 7679579

Claim:
A projection type image display apparatus for projecting a laser beam on a projection surface through a projection window of a main body to display images, comprising: a main body having a laser beam emitting section for emitting said laser beam, said laser beam emitting section including a laser source for emitting said laser beam; a first laser beam deflector for deflecting said laser beam from said laser source to scan said laser beam either in a horizontal or a vertical direction; and a second laser beam deflector for deflecting said laser beam from said first laser beam deflector to scan said laser beam in the other direction; an infrared sensor for detecting human presence in a detection area including a projection area of said laser beam extending from said projection window to said projection surface and a peripheral area around said projection area, said infrared sensor having a light receiving angle larger than a maximum projection angle of said laser beam projected through said projection window; and a laser beam power controller for controlling a power level of said laser beam to a predetermined level when said infrared sensor detects human presence in said detection area while said laser beam is being outputted, wherein said infrared sensor is disposed behind said second deflector and aligned to said projection axis of said laser beam projected through said projection window.