Automatic focus adjustment apparatus

A photographic camera having drive means for driving its photographing lens in response to a focus detection signal from focus detecting means, comprising:

• memory means;
• means for storing in said memory means data corresponding to a given position of said photographing lens;
• control means for controlling said drive means in accordance with said data stored in said memory means irrespective of said focus detecting means;
• inhibit means for inhibiting the operation of said drive means;
• and
• reset means for resetting the contents of said memory means in response to said inhibit means.

A photographic camera comprising:

• focus detecting means for generating a focus detection signal;
• drive means for driving a photographing lens;
• memory means;
• means for generating a store signal;
• means for storing in said memory means data corresponding to a given position of said photographing lens;
• means for outputting a switching signal;
• control means for controlling said drive means in response to said focus detection signal, said control means controlling said drive means in accordance with said data stored in said memory means in response to said switching signal and irrespective of said focus detection signal;
• reset means for resetting the contents of said memory means;
• indicating means;
• and
• drive means for driving said indicating means in response to said switching signal immediately after the resetting of said memory means.

A photographic camera having drive means for driving its photographing lens in response to a focus detection signal from focus detecting means, comprising:

• focus detecting means for generating a focus detection signal;
• drive means for driving a photographing lens;
• memory means;
• means for generating a store signal;
• means for storing in said memory means data corresponding to a given position of said photographing lens;
• means for outputting a switching signal;
• control means for controlling said drive means in response to said focus detection signal, said control means controlling said drive means in accordance with said data stored in said memory means irrespective of said focus detection signal in response to said switching signal;
• and
• means for giving warning in response to said switching signal when said data is not stored in said memory means.

A photographic camera, comprising:

• focus detecting means for generating a focus detection signal;
• drive means for driving a photographing lens;
• position detecting means for detecting the position of said photographing lens to generate a position detection signal;
• memory means;
• means for generating data corresponding to a given position of said photographing lens on the basis of said position detection signal and then storing said data in said memory means;
• generating means for generating a preset position signal corresponding to said data which is stored in said memory means;
• and
• select means for selecting a desired one of said focus detection signal and said preset position signal to input the thus-selected signal to said drive means, said drive means driving said photographing lens in response to said selected signal.

A photographic camera having drive means for driving its photographing lens in response to a focus detection signal from focus detecting means, comprising:

• means for sequentially detecting the position of said photographing lens to generate a position signal corresponding to the detected position of said photographing lens;
• memory means;
• means for outputting a store signal;
• means for storing in said memory means data corresponding to said position signal in response to said store signal;
• calculation means for performing the operation of determining the difference between a position corresponding to said data stored in said memory means and a position corresponding to said position signal to output a calculation signal corresponding to said calculated difference;
• and
• control means for controlling said drive means, irrespective of said focus detection means, so that said drive means may drive said photographing lens to a specified position in response to said calculated signal.

An photographic apparatus having drive means for driving its photographing lens in response to a focus detection signal from focus detecting means, comprising:

• means for detecting the position of said photographing lens to generate a position signal;
• memory means;
• store means for storing in said memory means data representative of a given position of said photographing lens;
• calculation means for performing the operation of determining the difference between a position represented by said data stored in said memory means and a position represented by said position signal;
• and
• control means for controlling said drive means so that said drive means may drive said photographing lens to a specified position in response to said calculated signal.