| 摘要 |
PURPOSE:To increase the number of channels without damaging the power efficiency of a laser by arranging an optical member to sandwich the divergence angle of respective laser lights to the front surface of plural lasers, and simultaneously executing the recording and reproducing of plural channels. CONSTITUTION:At the front surface of semiconductor lasers 11, 12,...1n, a micro- lens array 8 is distributed so that micro-lenses 81, 82,...8n can correspond. The divergence angle of laser lights l1, l2,...ln from the lasers 11, 12,...1n is made narrower by the lenses 81, 82,...8n, respectively and thereafter, the angle is supplied to a collimator lens 2. For this reason, even when the aperture ratio of a lens 2 is made smaller, the power efficiency of the laser is not damaged. Consequently, an interval L2 of prescribed positions P1-Pn on a recording medium 5 can be minimized and the number of channels can be enlarged. |
