Strobe device for photography

Claim 2

A strobe device for photography, comprising, a pair of power supply terminals; a first capacitor connected across said pair of terminals; a series circuit of a xenon discharge tube and a silicon control rectifier connected across said pair of terminals; a trigger circuit connected to said xenon discharge tube; a series circuit of a second capacitor and a resistor connected across said pair of terminals; and means controlling the discharge of said first capacitor in response to the quantIty of light received by a photosensitive elements, including means connecting said photosensitive element to an intermediate tap on said resistor and to the control gate of said rectifier, wherein said photosensitive element has a reverse polarity with respect to the voltage on said tap, to thereby control current flow through said silicon control rectifier.

Claim 3

A strobe device according to claim 1, further comprising means imparting a voltage difference between said second capacitor and said first capacitor subsequent to the light emission by said second capacitor through said tube, including a further resistor connected between said control gate and said tap.

Claim 4

A strobe device according to claim 1, wherein said resistor is a variable resistor and said tap is an adjustable tap.

Claim 5

A strobe device according to claim 1, further comprising means integrating the output of said photosensitive element, including a capacitor connected to the output of said photosensitive element.

Claim 6

A strobe device according to claim 1, further comprising amplifying means operatively connected between the output of said photosensitive element and said control gate.

Claim 7

A strobe device for photography, comprising: a) a pair of power supply terminals; b) a first series circuit of a xenon discharge tube having a trigger electrode and a silicon control rectifier having a gate electrode; c) a second series circuit of a first light emitting capacitor and a variable resistance means having an adjustable intermediate tap; d) a second capacitor for intensifying light emission from said first capacitor; e) means connecting said first series circuit, said second series circuit and said second capacitor, respectively, in parallel between said pair of power supply terminals; f) means connecting a junction point of said first capacitor and said resistance means to a junction point of said xenon discharge tube and said silicon control rectifier; g) means generating a voltage responsive to light discharged from said discharge tube and reflected from an object illuminated by said discharge light, said voltage generating means being connected between said gate electrode and said movable tap such that said voltage is superimposed on a voltage drop across said resistance means and in the opposite polarity therewith to thereby control current flow through said rectifier; h) and switch means connected between said trigger electrode and said power supply terminals for controlling triggering of said trigger electrode.

Claim 8

A strobe device for photography, comprising: a) a pair of power supply terminals; b) a first series circuit of a xenon discharge tube having a trigger electrode and a silicon control rectifier having a gate electrode; c) a second series circuit of a first light emitting capacitor and a variable resistance means having an adjustable intermediate tap; d) a second capacitor for intensifying light emission from said first capacitor; e) means connecting said first series circuit, said second series circuit and said second capacitor, respectively, in parallel between said pair of power supply terminals; f) means connecting a junction point of said first capacitor and said resistance means to a junction point of said xenon discharge tube and said silicon control rectifier; g) means generating a voltage responsive to light discharged from said discharge tube and reflected from an object illuminated by said discharge light, said voltage generating means being connected between said gate electrode and said movable tap such that said voltage is superimposed on a voltage drop across said resistance means and in the opposite polarity therewith to thereby control current flow through said rectifier; h) and switch means connected between said trigger electrode and said power supply terminals for controlling triggering of said trigger electrode.

Claim 9

A strobe device for photography as defined in claim 6, wherein said voltage generating means comprises a parallel circuit of a photo cell and a resistor.

Claim 10

A strobe device for photography as defined in claim 7 further comprising a third capacitor connected between said gate electrode and a cathode of said silicon control rectifier.

Claim 11

A strobe device for photography as defined in claim 6, wherein said voltage generating means comprises a transistor and photoconductive means connected to said transistor for generating a voltage at one electrode of said transistor in response to a variation in resistance in said photoconductive means.

Claim 12

A strobe device as defined in claim 9, further comprising a third capacitor connected between said gate electrode and a cathode of said silicon control rectifier.