초록 ▼

An autofocus camera includes an electronic flash and a piezoelectric focus motor that are both powered by a moderately high voltage power supply. The camera includes an automatic focus detector that senses a scene and produces a focus signal representing the required focus adjustment for the scene.

An autofocus camera includes an electronic flash and a piezoelectric focus motor that are both powered by a moderately high voltage power supply. The camera includes an automatic focus detector that senses a scene and produces a focus signal representing the required focus adjustment for the scene. A focus motor drive circuit responsive to the focus signal supplies a controlled amount of power from the power supply to the piezoelectric focus motor to drive a movable lens element to effect the required focus adjustment.

대표청구항 ▼

In a photographic camera of the type having a moderately high voltage power supply for powering electronic flash apparatus, and an adjustable focus lens including a lens element movable to adjust the focus, automatic focusing apparatus comprising: means for sensing a scene to be photographed and pro

In a photographic camera of the type having a moderately high voltage power supply for powering electronic flash apparatus, and an adjustable focus lens including a lens element movable to adjust the focus, automatic focusing apparatus comprising: means for sensing a scene to be photographed and producing a focus signal representative of the proper focus adjustment for the scene; piezoelectric motor means coupled to said movable lens element for moving said lens element in response to a moderately high voltage; and control circuit means electrically connected to said moderately high voltage power supply and responsive to said focus signal for applying a metered amount of power from said power supply to said piezoelectric motor means to move said lens element to said proper focus adjustment.