| 摘要 |
A communication system for a surveying instrument according to the present invention comprises a tracking target for reflecting a tracking light; a survey unit for irradiating the tracking light towards the tracking target and receiving a tracking reflected light from the tracking target by light receiving device to thereby track the tracking target; modulator provided in an optical path of the tracking reflected light to intermittently shield and modulate the tracking reflected light for transmitting information concerning the surveying work towards the survey unit; and demodulator for demodulating the tracking reflected light received by the light receiving device. In the optical communication by way of the tracking reflected light, information concerning the surveying work is transmitted, the influence caused by electric wave noises, radio interference or the like can be avoided, and modulation of the tracking reflected light is carried out by intermittent shield to reduce a burden of light emitting parts for emitting the tracking light.
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