Photographic apparatus

A photographic apparatus and system comprising:

• (a) a rear housing having a photosensitive material receiving chamber into which a photosensitive material is loaded;
• (b) a front housing having:
• a photographic lens optical system;
• and
• a photographic lens optical system position adjusting means for moving manually at least a part of said photographic lens optical system along an optical axis of said optical system to adjust the position at which said photographic lens optical system forms an image on said optical axis;
• (c) lens optical system position information output means for producing an output corresponding to the movement of said movable lens optical system in said photographic lens optical system when said movable lens optical system is moved;
• (d) distance information output means having object distance detecting means for measuring the distance from said photographic apparatus to an object to be photographed and capable of producing an output corresponding to the detected distance;
• said object distance detecting means having indicating means for indicating in said finder that said object distance detecting means has completed the distance detecting operation;
• and
• (e) electrical circuit means for producing a signal until the output of said lens optical system position information output means and the output of said distance information output means becomes a predetermined relationship;
• said means being electrically connected to both of said lens optical system position information output means and said distance information output means,
• wherein said electrical circuit means has a bridge circuit;
• said distance information output means has a double image coincidence type distance measuring instrument and a variable resistor constituting one branch of said bridge circuit and capable of varying the resistance value in response to the distance measuring operation of said distance measuring instrument;
• said photographic lens optical system position adjusting means has a variable resistor constituting one branch of said bridge circuit and capable of varying the resistance value in response to the movement of said movable lens optical system;
• and wherein said distance measuring means has a motor connected to the output terminals of said bridge circuit and movement control means for controlling said movement of said distance measuring means by the output of said motor corresponding to the movement of said movable lens optical system.

A collapsible photographic apparatus comprising:

• (a) a front housing having:
• a photographic lens optical system;
• photographic lens optical system position adjusting means for moving at least a part of said photographic lens optical system along an optical axis thereof to adjust the position at which said photographic lens optical system forms an image on said optical axis;
• a motor for driving said photographic lens optical system position adjusting means;
• and
• a variable resistor for input of photographic lens optical system position information and for providing a resistance value corresponding to the movement of said movable lens optical system in said photographic lens optical system when said movable lens optical system is moved;
• (b) a rear housing having a photosensitive material receiving chamber into which a photosensitive material is loaded, said rear housing having:
• a first finder optical system;
• a second finder optical system provided in combination with said first finder optical system to measure the distance to an object to be photographed;
• at least a portion of said second finder optical system being movable so that by the movement thereof, an image of the object entering through said first finder optical system and an image of the object entering through said second finder optical system are brought into coincidence with each other to thereby make use of the movement of said movable optical system;
• distance information input variable resistor for providing a resistance value corresponding to the movement of said movable lens optical system in said second finder optical system when said movable lens optical system is moved;
• and
• indicating means for indicating in said finder optical systems that a distance detecting operation is completed;
• (c) folding means capable of permitting said rear housing and said front housing to be moved from a state where said rear housing and said front housing are largely spaced apart from each other to a state where said rear housing and said front housing are extremely close to each other in a folded condition, thereby at least a portion of said front housing is received in said rear housing;
• (d) electrical channel cord means for electrically interconnecting said front housing and said rear housing;
• (e) balance circuit means for controlling driving of said motor, said means being electrically connected through said electrical channel cord means to said photographic lens optical system position information input variable resistor and said distance information input variable resistor, and the output terminals of said balance circuit means being connected to said motor;
• whereby said motor is driven until said balance circuit means is made almost balanced as the output of said photographic lens optical system position information input variable resistor and the output of said distance information input variable resistor have a predetermined relationship.

A collapsible photographic apparatus comprising:

• (a) front housing having:
• a photographic lens optical system;
• photographic lens optical system position adjusting means for moving at least a part of said photographic lens optical system along an optical axis thereof to adjust the position at which said photographic lens optical system forms an image on said optical axis;
• said means being operable from the outside of said front housing;
• and
• a photographic lens optical system position information input variable resistor for providing a resistance value corresponding to the movement of said movable lens optical system in said photographic lens optical system when said movable lens optical system is moved;
• (b) a rear housing having a photosensitive material receiving chamber into which a photosensitive material is loaded, said rear housing having:
• a first finder optical system;
• a second finder optical system provided in combination with said first finder optical system to measure the distance to an object to be photographed;
• at least a portion of said second finder optical system being movable so that by the movement thereof, an image of the object entering through said first finder optical system and image of the object entering through said second finder optical system are brought into coincidence with each other to thereby make use of the movement of said movable optical system as distance information;
• a motor for moving said movable optical system in said second finder optical system;
• distance information input variable resistor for providing a resistance value corresponding to the movement of said movable lens optical system in said second finder optical system when said movable lens optical system is moved;
• and
• indicating means for indicating in said finder optical systems that a distance detecting operation is completed;
• (c) folding means capable of permitting said rear housing and said front housing to be moved from a state where said rear housing and said front housing are largely spaced apart from each other to a state where said rear housing and said front housing are close to each other in a folded condition, thereby at least a portion of said front housing is received in said rear housing;
• (d) electrical channel cord means for electrically interconnecting said front housing and said rear housing;
• (e) balance circuit means for controlling driving of said motor, said means being electrically connected through said electrical channel cord means to said photographic lens optical system position information input variable resistor and said distance information input variable resistor, and the output terminals of said balance circuit means being connected to said motor;
• whereby said motor is driven until said balance circuit is made almost balanced as the output of said photographic lens optical system position information input variable resistor and the output of said distance information input variable resistor have a predetermined relationship.