Patent ID: 7675013

Claim:
An image displaying apparatus comprising: a plurality of light source units for emitting light beams within wavelength ranges different from each other that are modulated based on image information; a light combining unit for combining a plurality of light beams from the plurality of light source units into a single white light beam; a scanning unit for scanning a scanned surface with the single white light beam from the light combining unit and forming image information on the scanned surface; a light beam dividing unit, provided along an optical path between the light combining unit and the scanning unit, for dividing a single light beam into a plurality of light beams; a light receiving unit for receiving a beam divided by the light beam dividing unit; a controlling unit for synchronously controlling the scanning unit and the plurality of light source units, wherein the controlling unit controls the plurality of light source units so that light beams emitted therefrom are sequentially incident on the light receiving unit at sequential timings or at different timings; and an adjustment unit for adjusting a quantity of light emission of at least one light source unit among the plurality of light source units based on light quantities of the light beams received by the light receiving unit, wherein the light receiving unit is configured to receive light beams from a red light source unit and a green light source unit among the plurality of light source units but not a blue light beam from a blue light source unit among the plurality of light source units, wherein the light combining unit includes: a first dichroic mirror which reflects a part of light beam from the red light source unit and transmits a part of light beam from the green light source unit; and a mirror which transmits the light beam from the red light source unit which has been reflected on the first dichroic mirror and the light beam from the green light source unit which has been transmitted through the first dichroic mirror, and reflects the light beam from the blue light source unit, wherein the light beam dividing unit includes the first dichroic mirror, wherein the light receiving unit is configured to sense the light beam from the red light source unit which has been transmitted through the first dichroic mirror and the light beam from the green source unit which has been reflected on the first dichroic mirror.