| 摘要 |
PURPOSE:To provide a semiconductor light emitting device excellent in focusing and temperature stability, by lessening the variations of a focal position, etc., accompanied with the change of ambient temperature or element temperature. CONSTITUTION:A cap 12 of fiber reinforced resin with a small thermal expansion coefficient is attached to an optical element part A having a semiconductor laser element, etc., inside, and a lens fitting board 15 having a Fresnel lens 14 on the inside surface formed in one united body is fixed to the light emitting window 13 of the cap 12. |
