Patent ID: 8284504
Filing Date: 2012-10-09
Classification: G02B,G11B

Abstract:
1. A lens fixing device comprising: a lens portion including a lens made of a resin; and amounting portion on which the lens portion is mounted, wherein: the lens portion includes two projections projecting in directions away from a center axis of the lens, each of the two projections has a guide surface opposing to the mounting portion, and a mounted surface disposed away from the mounting portion with respect to the guide surface, the guide surfaces and the mounted surfaces are disposed at such positions that a line of intersection of an extension of the respective guide surfaces and an extension of the respective mounted surfaces is aligned with the center axis of the lens, and an angle defined by the guide surfaces of the two projections around the center axis is set smaller than 180 degrees, and wherein: the mounting portion includes two receiving surfaces to be brought into surface contact with the guide surfaces of the two respective projections in mounting the lens portion on the mounting portion, and a fixing surface adapted to be positioned adjacent to the mounted surfaces in a state that the two guide surfaces are brought into surface contact with the two respective receiving surfaces, and the mounted surfaces and the fixing surface are fixed to each other by an adhesive in a direction perpendicular to the mounted surfaces and the fixing surface in a state that the two guide surfaces are brought into surface contact with the two respective receiving surfaces.