Patent ID: 7233564

Claim:
An optical disk apparatus comprising: a plurality of light sources for emitting light rays of different wavelengths; coupling means having a coupling surface for transmitting one light ray from at least two light sources from among light rays emanating from said plurality of light sources and reflecting the other of the light rays; light collecting means for collecting light emanating from said coupling means and guiding the collected light to an optical disk; light receiving means disposed in the vicinity of said coupling means; and adjustment means for adjusting the power of at least one of said plurality of light sources in accordance with the intensity of light received by said light receiving means, wherein said coupling means guides, to said light receiving means, diffracted light which emanates from at least one of two light sources whose light rays are to be coupled together and which has not reached said light collecting means on an optical path by means of reflection or transmission at least within a prism at a surface other than the coupling surface.