Patent ID: 7180583

Claim:
An apparatus for calibration of an optical axis of a light beam generated by a light emitter of a light-emitting instrument, the light-emitting instrument further including a sighting unit having a specified position relationship with the light emitter, said apparatus comprising: a body having a surface provided with a cross hair, the cross hair including a pair of lines intersecting at a reference point and dividing said surface into an upper left quadrant, an upper right quadrant, a lower left quadrant and a lower right quadrant; a sensor module mounted on said lower right quadrant including an array of photo-detectors, each adapted to generate an output signal upon receipt of the light beam, a centermost one of said array of photo-detectors having a reference position relationship with said reference point of said cross hair corresponding to the specified position relationship between the sighting unit and the light emitter; an indicator module mounted on said upper left quadrant and including an array of indicator units, each corresponding to a respective one of said photo-detectors and capable of providing an indication when the respective one of said photo-detectors generates the output signal; and a driver module mounted on said body including a plurality of amplifier units, each coupled to a respective one of said photo-detectors and a respective one of said indicator units, each of the amplifier units being operable to amplify the output signal generated by a respective one of the photo-detectors to drive a respective one of the indicator units.