Abstract: In a driving mechanism of an optical device that communicates the motive power generated at a drive source to an object to be driven by employing a plurality of gears, the plurality of gears are each constituted by using, at least, one of; polyester, polyamide and polyacetals. The plurality of gears include a gear having a low bending elastic modulus set to 10 kgf/mm2 or higher and 100 kgf/mm2 or lower and a gear having a high bending elastic modulus set to 50 kgf/mm2 or higher and 1000 kgf/mm2 or lower that meshes with the gear having the low bending elastic modulus, and thus, it becomes possible to reduce the noise generated at the gear meshing portion without compromising the durability of the gears.

Abstract: A lens holding frame that secures and holds a lens, includes: a lens holding frame main body; a plurality of lens receptacle portions projecting inward at the lens holding frame main body and formed at the lens holding frame main body so as to position the lens along a direction of an optical axis of the lens by placing the lens in contact along the direction of the optical axis; and a plurality of injection portions formed inward at the lens holding main body through which an adhesive for bonding at least the lens and the lens receptacle portions is injected.

Abstract: A lens holding frame that secures and holds a lens, includes: a lens holding frame main body; a plurality of lens receptacle portions projecting inward at the lens holding frame main body and formed at the lens holding frame main body so as to position the lens along a direction of an optical axis of the lens by placing the lens in contact along the direction of the optical axis; and a plurality of injection portions formed inward at the lens holding main body through which an adhesive for bonding at least the lens and the lens receptacle portions is injected.

Abstract: In a driving mechanism of an optical device that communicates the motive power generated at a drive source to an object to be driven by employing a plurality of gears, the plurality of gears are each constituted by using, at least, one of; polyester, polyamide and polyacetals. The plurality of gears include a gear having a low bending elastic modulus set to 10 kgf/mm2 or higher and 100 kgf/mm2 or lower and a gear having a high bending elastic modulus set to 50 kgf/mm2 or higher and 1000 kgf/mm2 or lower that meshes with the gear having the low bending elastic modulus, and thus, it becomes possible to reduce the noise generated at the gear meshing portion without compromising the durability of the gears.

Abstract: A light-receiving detection device comprises: an optical device; a light-receiving surface for receiving light transmitted through the optical device; and a holder for holding the optical device with side surfaces and mounting surfaces which intersect with respective side surfaces and to which the light-receiving surface is bonded. Each of said side surface has a concavity (concavities) having at least two inner surfaces, at least one of which is tapered, that is, broadened at the lower portion. The adhesive to bond the light-receiving surface to the holder is applied in the cavity to flow down to the contact area of the light-receiving surface and the holder.