Patent ID: 7702198
Filing Date: 2010-04-20
Classification: B41J,G02B,H01S

Abstract:
1. A semiconductor laser module comprising a semiconductor laser light source, an optical fiber, a lens system by which light emitted from the semiconductor laser light source is condensed on an entrance end surface of the optical fiber, and a holding member which has a light-passing hole formed in the holding member and which holds the semiconductor laser light source in one end portion of the light-passing hole, the optical fiber in the other end portion of the light-passing hole and the lens system in an intermediate portion of the light-passing hole, wherein: angles of arrangement of the lens system and the optical fiber are set so that an angle β between a principal ray of optical fiber incidence light incident on the optical fiber via the lens system and a marginal ray of reflected light nearest to the principal ray of the optical fiber incidence light when the reflected light is the optical fiber incidence light reflected on the entrance end surface of the optical fiber is larger than an angle θ between the principal ray and a marginal ray of the optical fiber incidence light; a receiving surface is provided near the other end portion of the light-passing hole and separately from an inner surface of the light-passing hole; and the receiving surface and at least a part of the inner surface of the light-passing hole near the receiving surface are covered with a light-absorbing layer which absorbs the oscillation wavelength of the reflected light so that the reflected light is received by the receiving surface.