A fixing ring of a certain design for a lens module substantially reduces stray light. The fixing ring defines a central axis, and comprises a base surface and a processing surface, formed from an edge of the base surface. A first angle θ.sub.1 exists between a first side cut surface and a surface perpendicular to the central axis, a distance L1 and the first angle θ.sub.1 satisfy formulas 0.015 mm<L1<0.025 mm and 20°<θ.sub.1<40°. The disclosure further provides a lens module and an electronic device comprising the fixing ring. An anti-dazzle film, matching with the fixing ring to completely absorb stray light, is included in the lens module.

A fixing ring of a certain design for a lens module substantially reduces stray light. The fixing ring defines a central axis, and comprises a base surface and a processing surface, formed from an edge of the base surface. A first angle .sub.1 exists between a first side cut surface and a surface perpendicular to the central axis, a distance L1 and the first angle .sub.1 satisfy formulas 0.015 mm<L1<0.025 mm and 20<.sub.1<40. The disclosure further provides a lens module and an electronic device comprising the fixing ring. An anti-dazzle film, matching with the fixing ring to completely absorb stray light, is included in the lens module.

An optical scanning apparatus includes first and second light source units including respective light sources; a rotating polygon mirror that performs deflection scanning of laser beams emitted from the light sources included in the first and second light source units; and a positioning member including a first abutting portion on which the first light source unit abuts and a second abutting portion on which the second light source unit abuts, the positioning member positioning the first and second light source units. The first and second light source units are positioned by the positioning member and arranged next to each other in a rotation axis direction of the rotating polygon mirror. The positioning member is a single member disposed between the first and second light source units in the rotation axis direction.

An optical scanning apparatus includes first and second light source units including respective light sources; a rotating polygon mirror that performs deflection scanning of laser beams emitted from the light sources included in the first and second light source units; and a positioning member including a first abutting portion on which the first light source unit abuts and a second abutting portion on which the second light source unit abuts, the positioning member positioning the first and second light source units. The first and second light source units are positioned by the positioning member and arranged next to each other in a rotation axis direction of the rotating polygon mirror. The positioning member is a single member disposed between the first and second light source units in the rotation axis direction.