Through-the-lens light measuring system

Claim 2

In a single lens reflex camera, a through-the-lens light measuring system comprising an open lens first light measuring network including energizing and actuating terminals, a stopped down lens second light measuring network including energizing and actuating terminals, a battery, a first switch means connected between said network energizing terminals and said battery and comprising a double-throw switch connected between said battery and said network energizing terminals and including opposing interconnected first contacts and a first switch arm positioned between said first contacts and resiliently urged toward engagement with one of said first contacts, a second switch means connected to said network actuating terminals for alternatively actuating said networks, and switch actuating means normally maintaining said first switch means in a network deenergizing condition and for actuating said second switching means to selectively actuate one of said networks and concurrently actuate said first switching means to a circuit energizing condition, said switch actuating means including an actuating element normally urging said first switch arm to a position between and out of engagement with said first contacts and alternatively swingable in opposite directions to effect engagement between said switch arm and alternative of said contacts.

Claim 3

In a single lens reflex camera, a through-the-lens light measuring system comprising an open lens first light measuring network including energizing and actuating terminals, a stopped down lens second light measuring network including energizing and Actuating terminals, a battery, a first switch means connected between said network energizing terminals and said battery, a second switch means connected to said network actuating terminals for alternatively actuating said networks and comprising a double-throw switch including opposing second contacts and a second switch arm between said second contacts and resiliently urged into engagement with one of said second contacts, said second arm and one of each of said second contacts being connected between respective actuating terminals of said networks, and switch actuating means normally maintaining said first switch means in a network deenergizing condition and for actuating said second switching means to selectively actuate one of said networks and concurrently actuate said first switching means to a circuit energizing condition, said switch actuating means including an actuating element moveable alternatively to urge said second switch arm into engagement with one of said second contacts and to release said second arm into engagement with the other of said second contacts.

Claim 4

In a single lens reflex camera, a through-the-lens light measuring system comprising an open lens first light measuring network including energizing and actuating terminals, a stopped down lens second light measuring network including energizing and Actuating terminals, a battery, a first switch means connected between said network energizing terminals and said battery, a second switch means connected to said network actuating terminals for alternatively actuating said networks and comprising a double-throw switch including opposing second contacts and a second switch arm between said second contacts and resiliently urged into engagement with one of said second contacts, said second arm and one of each of said second contacts being connected between respective actuating terminals of said networks, and switch actuating means normally maintaining said first switch means in a network deenergizing condition and for actuating said second switching means to selectively actuate one of said networks and concurrently actuate said first switching means to a circuit energizing condition, said switch actuating means including an actuating element moveable alternatively to urge said second switch arm into engagement with one of said second contacts and to release said second arm into engagement with the other of said second contacts.

Claim 5

In a single lens reflex camera, a through-the-lens light measuring system comprising an open lens first light measuring network including energizing and actuating terminals, a stopped down lens second light measuring network including energizing and actuating terminals, a battery, a first switch means connected between said network energizing terminals and said battery and comprising a double-throw switch connected between said battery and said network energizing terminals and including opposing interconnected first contacts and a first switch arm positioned between said first contacts and resiliently urged toward engagement with one of said contacts, a second switch means connected to said network actuating terminals for alternatively actuating said networks and comprising double-throw switch including opposing second contacts and a second switch arm between said second contacts and resiliently urged into engagement with one of said second contacts, said second arm and one of each of said second contacts being connected between respective actuating terminals of said networks, and switch actuating means normally maintaining said first switch means in a network deenergizing condition and for actuating said second switching means to selectively actuate one of said networks and concurrently actuate said first switching means to a circuit energizing condition, said switch actuating means including an actuating element normally urging said first switch arm to a position between and out of engagement with said first contacts and alternatively swingable in opposite directions to effect engagement between said switch arm and alternative of said contacts and moveable away from said first switch arm to engage and urge said second switch arm in a direction opposite the resilient urging thereof out of engagement with said second contact normally engaged thereby into engagement with the other of said second contacts.

Claim 6

In a single lens reflex camera, a through-the-lens light measuring system comprising an open lens first light measuring network including energizing and actuating terminals, a stopped down lens second light measuring network including energizing and actuating terminals, a battery, a first switch means connected between said network energizing terminals and said battery and comprising a double-throw switch connected between said battery and said network energizing terminals and including opposing interconnected first contacts and a first switch arm positioned between said first contacts and resiliently urged toward engagement with one of said contacts, a second switch means connected to said network actuating terminals for alternatively actuating said networks and comprising double-throw switch including opposing second contacts and a second switch arm between said second contacts and resiliently urged into engagement with one of said second contacts, said second arm and one of each of said second contacts being connected between respective actuating terminals of said networks, and switch actuating means normally maintaining said first switch means in a network deenergizing condition and for actuating said second switching means to selectively actuate one of said networks and concurrently actuate said first switching means to a circuit energizing condition, said switch actuating means including an actuating element normally urging said first switch arm to a position between and out of engagement with said first contacts and alternatively swingable in opposite directions to effect engagement between said switch arm and alternative of said contacts and moveable away from said first switch arm to engage and urge said second switch arm in a direction opposite the resilient urging thereof out of engagement with said second contact normally engaged thereby into engagement with the other of said second contacts.

Claim 7

The system of claim 3 comprising a self-timer including a rotatable winding shaft, a winding element, a rotatable lost motion coupling device connecting said winding element to said shaft and permitting free limited rotation thereof in opposite directions relative to said shaft, a means coupling said winding element to said actuating element for moving said actuating element in opposite directions with the movement of said winding element.

Claim 8

The system of claim 4 wherein said actuating element comprises a lever including a first arm swingable in a path extending between alternative engagement of said switching arms and a second arm engageable by said winding element coupling means.

Claim 9

The system of claim 3 including a diaphragm control element and means coupling said actuating element to said diaphragm control element.

Claim 10

In a single lens reflex camera, a through-the-lens light measuring system comprising an open lens first light measuring network, a stopped down lens second light measuring network, a self-timing device including a winding shaft, a winding member, a rotatable lost motion coupling between said winding member and said winding shaft permitting the free limited rotation of said winding member in opposite directions, and means responsive to the opposite rotations of said winding member for alternatively actuating said networks.

Claim 11

In a single lens reflex camera, a through-the-lens light measuring system comprising an open lens first light measuring network, a stopped down lens second light measuring network, a self-timing device including a winding shaft, a winding member, a rotatable lost motion coupling between said winding member and said winding shaft permitting the free limited rotation of said winding member in opposite directions, and means responsive to the opposite rotations of said winding member for alternatively actuating said networks.

Claim 12

The system of claim 7 comprising a battery, said actuating means including a first switch connected between said networks and said battery, a second switch alternatively closing said first and second networks, and a switch actuating lever operable with said winding member for concurrently closing said first switch and controlling said second switch to close a selected of said networks.