| 摘要 |
PURPOSE:To make a device compact, and also, to simplify the wiring by constituting so that a laser light is made incient into an optical medium for propagating a longitudinal wave of an ultrasonic wave, irradiating an original by curving said laser light by the longitudinal wave of the ultrasonic wave in said optical medium, and photodetecting reflected light from the original by a photoelectric converting element. CONSTITUTION:A laser light source 32 is placed on the end face of an optical medium 35 provided with an electrode on both ends, and a laser light emitted from its laser light source 32 is curved in the direction of an original 31 by a longitudinal wave 36 of an ultrasonic wave. Said curved laser light is reflected to the optical medium by a light intensity corresponding to a reflection factor (density) of the original 31. Subsequently, its reflected laser light is curved by the longitudinal wave 36 of the ultrasonic wave again, and made incident to a photoelectric converting element 33 provided on the end face of the optical medium 35, by which said reflected light is converted to an electric signal. Scanning of the direction (usually, a right angle direction) crossing the direction of the optical medium 35 is executed by moving a read system consisting of the original 31 or the optical medium 35, the laser light source 32 and the photoelectric onverting element 33, in said direction. |
