Patent ID: 8562150

Claim:
A projection-type display apparatus comprising: an optical axis adjustment device including: a first reflection/branching filter that reflects and branches a part of the incident beam; position detection imaging device that has an imaging plane where the laser beam having passed through the first reflection/branching filter enters; a condenser lens that focuses the laser beam reflected by the first reflection/branching filter; and angle detection imaging device that has an imaging plane where the laser beam focused by the condenser lens enters, wherein the angle of the optical axis of the incident laser beam emitted from the light source is determined based on the position where the laser beam enters on the imaging plane of the angle detection imaging device; the position of the optical axis of the incident laser beam emitted from the light source is determined based on the position where the laser beam enters on the imaging plane of the position detection imaging device; and a signal for adjusting the angle and position of the optical axis is generated; a plurality of light sources; condenser lenses provided to the respective light sources; actuators that make a single-axis adjustment or multiple-axis adjustment to pairs of the condenser lens and the light source; a plurality of combining filters that combine laser beams from the plurality of light sources via the condenser lenses; and a two-dimensional scan mirror that reflects the plurality of combined laser beams at any angle, wherein: the plurality of light sources modulate laser beams according to an image signal and supply the modulated laser beams; the modulated laser beams are converted by the condenser lenses into collimated light beams or approximately collimated light beams; the collimated light beams are combined on the same optical axis by the combining filters that combine the plurality of laser beams; the light beams from the plurality of light sources are reflected by the two-dimensional scan mirror to impinge onto a screen; the combined laser beams enter the optical axis adjustment device; and the optical axis adjustment device generates a signal for adjusting the angle and position of the optical axis to drive the actuators.