초록 ▼

An automatic focusing device is capable of providing stable operation in a range close to the in-focus position, without degrading resopnse outside the range. In the focusing device, a photographic lens is driven, outside a range close to the in-focus position, according to a focusing signal, but, w

An automatic focusing device is capable of providing stable operation in a range close to the in-focus position, without degrading resopnse outside the range. In the focusing device, a photographic lens is driven, outside a range close to the in-focus position, according to a focusing signal, but, within said range, according to a control signal so modified as not to reflect very fast changes in the focusing signal.

대표청구항 ▼

In a focusing control device having detecting means for time-sequentially generating detection signals varying in accordance with the positional relationship between a predetermined image plane and an image plane of an object formed through an imaging optical system, and means for driving said imagi

In a focusing control device having detecting means for time-sequentially generating detection signals varying in accordance with the positional relationship between a predetermined image plane and an image plane of an object formed through an imaging optical system, and means for driving said imaging optical system based on said detection signals so that the image of said object and said predetermined image plane can be caused to coincide, the improvement comprising: (a) means for averaging said sequential detection signals and generating an average signal; (b) means for discriminating, based on the average signal, that the image of said object is within a range close to said image plane and generating a discriminating signal; and (c) means for impeding said driving means from driving said imaging optical system in response to said discriminating signal.