Eye span adjustment mechanism for binoculars

摘要

Binoculars including an eye span adjustment mechanism and an automatic focussing feature. A pair of guide rails is disposed laterally in the binoculars housing. Drive rods threadedly engaged with the lens barrels are movable along the guide rails to move the lens barrels back and forth in response to rotation of a knob and adjustment rod. An automatic focussing is disposed between the lens barrel to move the ocular lens in response to an electronically produced focussing signal.