There is provided a semiconductor laser device containing a laser driver capable of implementing downsizing, thinning and cost reduction of equipment using the laser device. In the semiconductor laser device containing a laser driver, a semiconductor laser element, a laser driver for driving the laser element, and a signal detection part for performing photoelectric conversion are mounted on a common mount surface of a lead frame and moreover accommodated in a common package. Upward of the semiconductor laser element is provided a hologram element for transmitting laser light emitted by the laser element toward a recording medium and then diffracting toward the signal detection part the laser light reflected by the recording medium. The laser driver and the signal detection part are disposed on both sides with respect to an optical axis of the laser element.

In a disclosed optical scanner, an optical axis adjustment is made by moving a circuit board on which a light emitting device open-type semiconductor laser is mounted along a base face of an optical box. For a high-quality optical scanning, the circuit board is attached to the base face of the optical box. The invention provides a light emitting element open-type in which a semiconductor laser is disposed in an optical box which is almost hermetically sealed with a cover to avoid adhesion of dusts, electrostatic destroy, and deterioration in picture quality.

An optical assembly includes an optical collimator having an outer periphery and an optical-path end opening. A collimator beam-path axis extends through the optical-path end opening. The optical assembly further includes a hollow bonding sleeve having a sidewall having an inner periphery receivable over and affixed to the outer periphery of the optical collimator, an endwall having an aperture therethrough in facing relation to the optical-path end opening of the optical collimator; and an optical device in registry with the aperture of the endwall and affixed to the endwall. To fabricate the optical assembly, the optical collimator and the bonding sleeve are separately prepared, the optical device is affixed in registry with the aperture of the endwall, the bonding sleeve is assembled to the optical collimator, the optical device is aligned with the collimator beam-path axis, and the bonding sleeve is affixed to the optical collimator.

A light guide plate comprises: an outgoing radiation plane; a bottom opposed to the outgoing radiation plane; and an incidence plane disposed between the outgoing radiation plane and the bottom; wherein projections or recesses are formed on the bottom along the progress direction of incident light at a regular interval, the projections or recesses have long-side and short-side faces, an projection area of the long-side face on the outgoing radiation plane is three times or more that of the short-side face on the outgoing radiation plane, the long-side face is a projection, the long-side face is placed on the incidence plane side in the case of projections, the long-side face is placed on a side opposed to the incidence plane in the case of recesses.

A laser transmitter adapted for use in small spaces such as pipes and sewers includes a housing having two exit windows positioned in generally orthogonal planes. The laser transmitter includes a leveling mechanism that is capable of directing a collimated beam through a select one of the two exit windows, in a generally horizontal direction at a specified grade irrespective of whether the laser transmitter is oriented generally horizontally or generally vertically.