Patent ID: 7372771
Filing Date: 2008-05-13
Classification: G01C,G01S

Abstract:
1. An apparatus for measuring a distance using a laser beam and a supersonic wave, the apparatus comprising: a supersonic transceiver generating and transmitting a supersonic wave according to a control signal received from an outside and receiving the supersonic wave reflected and returning back; a laser generation unit generating a laser beam according to a control signal received from the outside; a resistance varying unit sensing a rotation of the laser generation unit, varies a resistance value according to an amount of the rotation, and dividing a constant voltage output from a power supply unit; a voltage multiplication unit sensing a level of the constant voltage output from the resistance varying unit and multiplying the constant voltage by a predetermined number when the level of the constant voltage is less than a predetermined level; an analog-to-digital converter converting an analog signal received from each of the supersonic transceiver, the resistance varying unit, and the voltage multiplication unit into a digital signal; a button unit comprising a plurality of buttons for receiving a command from a user; a display unit displaying a measured distance; a speaker unit generating sound when a distance measured by the supersonic transceiver reaches a reference distance; a memory unit storing distance data corresponding to a voltage value output from each of the resistance varying unit and the voltage multiplication unit in a table form; and a control unit controlling the speaker unit to generate sound after checking that the reference distance has been reached based on a signal received from the supersonic transceiver via the analog-to-digital converter, reading from the memory unit distance data corresponding to signals received from the resistance varying unit and the voltage multiplication unit via the analog-to-digital converter, controlling the display unit to display the distance data.