Abstract: A laser instrument of the kind used to detect light reflected from a target which is spaced from the laser instrument, includes a source laser for generating a laser high beam for transmission to the target and a bifocal lens assembly which is retro-directive in nature. The bifocal lens assembly is composed of a lens, and a mirror, much smaller in diameter than the lens, being attached to the lens for receiving and reflecting the laser light beam onto the optical axis of the lens. Respective small diverging and converging lens portions, formed on opposite sides of the lens and in alignment with its optical axis, expand and focus the received laser beam on the target. Respective large diameter converging lens portions, formed on opposite sides of the lens about the respective small diameter diverging and converging lens portions and in alignment with the optical axis of the lens, collect and focus on a light detector the light being reflected from the target.

Abstract: A laser instrument of the kind used to read or to detect light reflected from a target which is spaced from the laser instrument comprises a laser for generating a laser beam for transmission to the target, and a detector for detecting light reflected from the target and a trifocal, composite, single piece lens system. The trifocal lens system receives the laser beam from the laser at an angle which is off the optical axis of the lens system, routes the received laser beam onto the optical axis for transmission through the lens system and toward the target, collects light reflected from the target and images and transmits the collected light along the optical axis to the detector means. In a specific embodiment of the invention the trifocal, composite, single piece lens system is a plastic molded structure.