Photographic camera including pulse controlled shutter

Claim 2

In an arrangement for controlling the exposure provided by a photographic camera including at least one shutter member movable between open and closed positions, pulse operated means for moving said at least one shutter member, electrical control means for producing a first electrical pulse for controlling the opening movement of said at least one shutter member and for producing a second electrical pulse for controlling the closing movement of said at least one shutter member, the time interval between said pulses determining the effective exposure time provided, and setting means for selectively setting the time interval between the first and second pulses, the improvement comprising electrical compensating means for compensatingly varying the duration of at least one of the first and second pulses, adjusting means for selectively adjusting the amount of variation in pulse duration provided by said compensating means so as to determine the pulse duration of at least one of said first and second pulses, and coupling means connected between said setting means and said adjusting means for automatically determining the adjustment provided by said adjustment means, in accordance with the setting of said setting means, so as to automatically vary the duration of said at least one of said first and second pulses in accordance with the time interval between said first and second pulses.

Claim 3

An arrangement as claimed in claim 1 wherein said electrical control means includes pulse shaper means including an RC network and said electrical compensating means includes means for varying the time constant of said RC network in accordance with the setting of said setting means.

Claim 4

An arrangement as claimed in claim 2 wherein said electrical compensating means includes a plurality of different valued resistances and said adjusting means comprises a switch means for connecting selected ones of said plurality of resistances into circuit relationship with said RC network.

Claim 5

An arrangement as claimed in claim 1 wherein said shutter unit includes magnetic actuating means for controlling the movement of said at least one shutter member, said magnetic actuating means comprising a movable armature and a single electromagnetic winding for controlling the movement of said armaTure in accordance with the polarity of said electromagnetic winding, said electrical control means further including a transistor bridge circuit for converting said first and second pulses into polarity control signals for said electromagnetic winding.

Claim 6

An arrangement as claimed in claim 1 further comprising means for controlling the wave shape of at least one of said first and second pulses.

Claim 7

An arrangement as claimed in claim 5 wherein the last-named means comprises an inductance, a capacitor, a battery for charging said capacitor, and a transistor for providing, in the conductive state thereof, a discharge path for said capacitor, said path including said inductance.

Claim 8

In an improved arrangement for controlling the exposure provided by a photographic camera comprising a shutter unit including at least one shutter movable between open and closed position, and pulse operated electromagnetic means for causing movement of said at least one shutter member; a second, separate unit comprising electrical control means for producing a first electrical pulse for controlling the opening movement of said at least one shutter member and for producing a second electrical pulse for controlling the closing movement of at least one shutter member, the said pulses determining the effective exposure time provided, setting means for selectively setting the time interval between the first and second pulses; and connecting means for detachably connecting said pulse operated means of said shutter unit and said electrical control means of said second, separate unit, the improvement comprising electrical compensating means mounted in said separate unit for compensatingly varying the duration of at least one of the first and second pulses, connecting means connected between said shutter unit and said separate unit for, upon connection of said shutter unit and said separate unit, automatically connecting said compensating means and said electrical control means so as to automatically compensatingly vary the duration of at least one of said first and second pulses in accordance with the exposure time provided by the shutter unit utilized.

Claim 9

In an improved arrangement for controlling the exposure provided by a photographic camera comprising a shutter unit including at least one shutter movable between open and closed position, and pulse operated electromagnetic means for causing movement of said at least one shutter member; a second, separate unit comprising electrical control means for producing a first electrical pulse for controlling the opening movement of said at least one shutter member and for producing a second electrical pulse for controlling the closing movement of at least one shutter member, the said pulses determining the effective exposure time provided, setting means for selectively setting the time interval between the first and second pulses; and connecting means for detachably connecting said pulse operated means of said shutter unit and said electrical control means of said second, separate unit, the improvement comprising electrical compensating means mounted in said separate unit for compensatingly varying the duration of at least one of the first and second pulses, connecting means connected between said shutter unit and said separate unit for, upon connection of said shutter unit and said separate unit, automatically connecting said compensating means and said electrical control means so as to automatically compensatingly vary the duration of at least one of said first and second pulses in accordance with the exposure time provided by the shutter unit utilized.

Claim 10

An arrangement as claimed in claim 7 wherein the electrical control means is connected to said electromagnetic means through a flexible cable means and said compensating means including a plurality of different valued resistances for determining the duration at least one of said first and second pulses, said flexible cable means including means for providing connection of selected ones of said resistances into circuit relationship with said electrical control means in accordance with the minimum exposure time provided by the particular shutter unit with which the electrical control means is used.