| 摘要 |
[Objective] To restrict degradation of optical characteristics due to a resin adhesive containing an inorganic filler. [Means] The width d of a lens body 31 and the height of an inorganic filler 341 in a direction orthogonal to the surface of a substrate are set such that an inclination angle of a collimating lens 3 does not exceed a maximum tolerable inclination angle when the inorganic filler 341 is positioned near the width-wise center of the lens body 31. As a result, even when the inorganic filler 341 is inserted between the bottom surface of the collimating lens 3 and the top surface of the substrate 4, degradation of the optical characteristics of the laser module including skewing of the optical axis of the laser light and distortion of the beam shape of the laser light can be restricted. |
