Zoom lens having an automatic focus detecting device

Details Zoom lens having an automatic focus detecting device Zoom lens having an automatic focus detecting device

1982-06-18

1984-09-18

Corbin, John K.

354403, G02B 711

Patent

active

044720335

ABSTRACT:
A zoom lens provided with a first group lens having a negative power and a second group lens having a positive power, the first group lens being moved in the direction of the optical axis for focus adjustment, the first group lens and the second group lens being moved in the direction of the optical axis for zooming, includes means for detecting the focused condition of the zoom lens to an object, the detecting means including optical means for receiving a light beam from the object which is discrete from a light beam incident on the zoom lens, and means for making an output signal representative of the focused condition from the light beam passed through the optical means, and means for integrally supporting the detecting means and the first group lens for conjoint movement in the direction of the optical axis.

REFERENCES:
patent: 4346967 (1982-08-01), Komoto et al.
patent: 4351590 (1982-09-01), Hirata et al.

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