Photographic exposure meter

Claim 2

An exposure meter for a photographic camera for connection to a power source, comprising: a first amplifier circuit having at least a control terminal and a load terminal; a main pilot lamp connected as a load with respect to said first amplifier circuit; a photoelectric element connected with the control terminal of said first amplifier circuit; means connecting the load terminal of said first amplifier circuit to the control terminal of said second amplifier circuit; whereby the magnitude of the brightness of said main pilot lamp and the magnitude of the brightness of said auxiliary pilot lamp change in the opposite direction with respect to each other in response to a change of resistance of said photoelectric element.

Claim 3

An exposure meter for a camera as set froth in claim 1, wherein said connecting means include a resistor connecting together said load terminal of said first amplifier circuit and said control terminal of said second amplifier circuit.

Claim 4

An exposure meter for a photographic camera for connection to a power source wherein said exposure meter comprises: a first amplifier having at least a control terminal and a load terminal; photoelectric means operatively connected with said first amplifier and with the control terminal thereof for controlling the conductive state of said first amplifier; a first pilot lamp opEratively coupled with the load terminal of said first amplifier to be lighted in accordance with current passing through said first amplifier; at least a second amplifier having at least a load terminal and a control terminal wherein the control terminal of said second amplifier is operatively coupled with the load terminal of said first amplifier to enable the conducting state of said first amplifier to control the conducting state of said second amplifier; means for permitting connection of said amplifier and said power source; and a second pilot lamp operatively coupled to the load terminal of said second amplifier to be lighted in accordance with current passing through said second amplifier, and wherein said second amplifier is operatively coupled with said first amplifier in parallel relationship to enable the conducting states of said amplifiers to vary in predetermined relationship with respect to one another.

Claim 5

An exposure meter for a photographic camera for connection to a power source wherein said exposure meter comprises: a first amplifier having at least a control terminal and a load terminal; photoelectric means operatively connected with said first amplifier and with the control terminal thereof for controlling the conductive state of said first amplifier; a first pilot lamp opEratively coupled with the load terminal of said first amplifier to be lighted in accordance with current passing through said first amplifier; at least a second amplifier having at least a load terminal and a control terminal wherein the control terminal of said second amplifier is operatively coupled with the load terminal of said first amplifier to enable the conducting state of said first amplifier to control the conducting state of said second amplifier; means for permitting connection of said amplifier and said power source; and a second pilot lamp operatively coupled to the load terminal of said second amplifier to be lighted in accordance with current passing through said second amplifier, and wherein said second amplifier is operatively coupled with said first amplifier in parallel relationship to enable the conducting states of said amplifiers to vary in predetermined relationship with respect to one another.

Claim 6

An exposure meter as in claim 3 further including a first resistor connecting the control terminal of said second amplifier to the load terminal of said first amplifier.

Claim 7

An exposure meter as in claim 4 further including a second resistor connected to said first resistor and to the control terminal of said second amplifier and for connecting to said power source.

Claim 8

A photoelectric metering device for use with a source of electric potential, comprising: impinging photoresistor means for varying its resistance in accordance with light impinging thereon; means for coupling said photoresistor means to said source of electric potential; a first semiconductor amplifier means coupled to said photoresistor means and having a first output; a first indicator means operatively connected to said output for actuation in dependency on the intensity of light illuminating said photoresistor means; a second semiconductor amplifier means having a control terminal and a second output and having second indicator means coupled to said second output, said second amplifier means being in parallel circuit with said first amplifier means; and means for coupling said control terminal and second indicator means to said first output of said first amplifier means and to said source of electric potential for enabling actuation of said second indicator means in inverse relation to the indication of said first indicator means.

Claim 9

A photoelectric metering device for use with a source of electric potential, comprising: impinging photoresistor means for varying its resistance in accordance with light impinging thereon; means for coupling said photoresistor means to said source of electric potential; a first semiconductor amplifier means coupled to said photoresistor means and having a first output; a first indicator means operatively connected to said output for actuation in dependency on the intensity of light illuminating said photoresistor means; a second semiconductor amplifier means having a control terminal and a second output and having second indicator means coupled to said second output, said second amplifier means being in parallel circuit with said first amplifier means; and means for coupling said control terminal and second indicator means to said first output of said first amplifier means and to said source of electric potential for enabling actuation of said second indicator means in inverse relation to the indication of said first indicator means.

Claim 10

A photoelectric exposure metering device as in claim 6 wherein said second amplifier coupling means includes resistor means connected between the said first output of said first amplifier means and the input of said second amplifier means for controlling the second amplifier means in accordance with the output of the first amplifier means.