This invention discloses a position distinguish machine which comprise one conducting bar, some conducting terminals, some fan-outs and one examine setting, this conducting bar earth or contact zero line. The fan-outs pair conducting terminals one by one. There is pressure difference between every fan-out and its corresponding conducting terminal. Either conducting bar or conducting terminal can move toward each other. These conducting terminals and conducting bar can conduct or cut off, this examine setting use for examine export signal of every fan-outs. This invention also publish a camera lens which comprise one drawtube, one sleeve and the position distinguish machine. The drawtube locate inside of the sleeve, and can move along axes, the conducting bar locate on the drawtube, conducting terminal locate on the sleeve. This position examine machine can distinguish position easily, accurately. This camera lens can move accurately when it focuses or zooms. And frame of this camera lens is brief, bulk is small. |