Abstract: An optical system for a laser range finder comprises a laser emitter (5), a collimating lens (4) positioned in front of the laser emitter an optical receiver (3), a light receiving aspheric lens (1) for converging reflected light from a target object to be measured on the optical receiver, and a polygonal prism (2) disposed between the light receiving aspheric lens and the optical receiver. The light receiving aspheric lens defines a cutout in a position corresponding to a laser light beam emitted by the laser emitter for allowing passage of the laser light beam therethrough. The polygonal prism consists of a first portion and a second portion refracting the reflected light at different refraction angles for light path compensating purposes.

Abstract: An optical axis adjusting mechanism disposed on a laser ruler for adjusting an optical axis of the laser ruler is provided. The laser ruler includes a main bracket. The optical axis adjusting mechanism includes a main body rotatably assembled to the main bracket of the laser ruler with a shaft, and one or more adjusting elements for selectively rotating the main body about the shaft to adjust an optical axis of the laser ruler.

Abstract: An optical system for a laser range finder comprises a laser emitter (5), a collimating lens (4) positioned in front of the laser emitter an optical receiver (3), a light receiving aspheric lens (1) for converging reflected light from a target object to be measured on the optical receiver, and a polygonal prism (2) disposed between the light receiving aspheric lens and the optical receiver. The light receiving aspheric lens defines a cutout in a position corresponding to a laser light beam emitted by the laser emitter for allowing passage of the laser light beam therethrough. The polygonal prism consists of a first portion and a second portion refracting the reflected light at different refraction angles for light path compensating purposes.