Discrimination circuit of physical quantities

Claim 2

A discrimination circuit comprising: converter means for converting a physical quantity into an electrical quantity; a differential amplifier having a first input terminal connected to the output terminal of said converter means, and a second input terminal, said differential amplifier producing an output only when the potential of said first input terminal exceeds that of said second input terminal; first and second switching means connected to one of the outputs of said differential amplifier to be driven alternately; first and second display lamps controlled by the outputs of said first and second switching elements, respectively; a capacitor connected between the output of said first switching means and said second input terminal of said differential amplifier; a first resistor connected between the output of said second switching means and said second input terminal of said differential amplifier; a source of electrical power supply; a resistance potentiometer connected across said electrical power source to produce a constant potential; and a second resistor for supplying said constant potential to said of said differential amplifier; said differential amplifier driving one of said first and second switching means when the potential of said first input terminal of said differential amplifier exceeds that of said second input terminal, and the output of at least one of said first and second switching means being fed back to said second input terminal of said differential amplifier through at least one of said capacitor and said first resistor so as to selectively operate said first and second display lamps.

Claim 3

The discrimination circuit according to claim 1 wherein said first and second switching means comprise cascade connected transistors, and said first and second display lamps are respectively connected to the collector electrodes of said transistors.

Claim 4

The discrimination circuit according to claim 1 which further includes a display unit including a casing containing at least said first and second display lamps in spaced apart relationship, an aligned slit and filter for each one of said first and second display lamps, a semi-transparent mirror disposed between said first and second display lamps and inclined 45* with respect a line interconnecting said first and second display lamps, and a reflecting mirror on the back of said semi-transparent mirror, said reflecting mirror being parallel with said interconnecting line.

Claim 5

The discrimination circuit according to claim 3 wherein the slits associated with respective display lamps are in the form of triangular openings having apices directed in the opposite directions.

Claim 6

The discrimination circuit according to claim 3 wherein said filters associated with respective display lamps transmit light of different colors.

Claim 7

The discrimination circuit according to claim 1 wherein each of said switching means comprises at least one transistor.

Claim 8

The discrimination circuit according to claim 1 wherein said first and second switching means respectively comprise first and second switching transistors, the base electrode of said first transistor being coupled to the output of said differential amplifier, one of said emitter and collector electrodes of said first transistor being coupled to a fixed potential and the other of said emitter and collector electrodes of said first transistor comprising the output of said first switching means and being coupled to said capacitor and to said first display lamp; the base electrode of said second transistor being coupled to thE output of said first switching means, one of said emitter and collector electrodes being coupled to said fixed potential and the other of said emitter and collector electrodes of said second transistor comprising the output of said second switching means and being coupled to said first resistor and to said second display lamp.

Claim 9

A discrimination circuit comprising: converter means for converting a physical quantity into an electrical quantity; a differential amplifier having a first input terminal connected to the output terminal of said converter means, and a second input terminal, said differential amplifier producing an output only when the potential of said first input terminal exceeds that of said second input terminal; first and second switching means connected to one of the outputs of said differential amplifier to be driven alternately; a capacitor connected between the output of said first switching means and said second input terminal of said differential amplifier; a first resistor connected between the output of said second switching means and said second input terminal of said differential amplifier; a source of electrical power supply; a resistance potentiometer connected across said electrical power source to produce a constant potential; a second resistor for supplying said constant potential to said second input terminal of said differential amplifier; a rectifier-integrator connected to the output of one of said switching means for rectifying the AC component of said output and for integrating the rectified AC component; a third switching means connected to the output side of said rectifier-integrator, said third switching means operating when the output from said rectifier-integrator exceeds a predetermined value; a first display lamp operated by the output from said third switching means; a fourth switching means connected to operate when the output from said third switching means coincides with the output from said first switching means; a fifth switching means connected to operate when the output from said third switching means coincides with the output from said second switching means; a second display lamp connected to the output of said fourth switching means; and a third display lamp connected to the output of said fifth switching means; said differential amplifier driving one of said first and second switching elements when the potential of said first input terminal exceeds that of said second input terminal, and the output of at least one of said first and second switching means being fed back to said second input of said differential amplifier through at least one of said capacitor and said first resistor so as to selectively operate said first, second and third display lamps.

Claim 10

A discrimination circuit comprising: converter means for converting a physical quantity into an electrical quantity; a differential amplifier having a first input terminal connected to the output terminal of said converter means, and a second input terminal, said differential amplifier producing an output only when the potential of said first input terminal exceeds that of said second input terminal; first and second switching means connected to one of the outputs of said differential amplifier to be driven alternately; a capacitor connected between the output of said first switching means and said second input terminal of said differential amplifier; a first resistor connected between the output of said second switching means and said second input terminal of said differential amplifier; a source of electrical power supply; a resistance potentiometer connected across said electrical power source to produce a constant potential; a second resistor for supplying said constant potential to said second input terminal of said differential amplifier; a rectifier-integrator connected to the output of one of said switching means for rectifying the AC component of said output and for integrating the rectified AC component; a third switching means connected to the output side of said rectifier-integrator, said third switching means operating when the output from said rectifier-integrator exceeds a predetermined value; a first display lamp operated by the output from said third switching means; a fourth switching means connected to operate when the output from said third switching means coincides with the output from said first switching means; a fifth switching means connected to operate when the output from said third switching means coincides with the output from said second switching means; a second display lamp connected to the output of said fourth switching means; and a third display lamp connected to the output of said fifth switching means; said differential amplifier driving one of said first and second switching elements when the potential of said first input terminal exceeds that of said second input terminal, and the output of at least one of said first and second switching means being fed back to said second input of said differential amplifier through at least one of said capacitor and said first resistor so as to selectively operate said first, second and third display lamps.

Claim 11

The discrimination circuit according to claim 8 wherein each of said switching means comprises at least one transistor. a fixed potential and the other of said emitter and collector

Claim 12

The discrimination circuit according to claim 9 wherein the base electrode of said first transistor is coupled to the output of said differential amplifier, one of said emitter and collector electrodes of said first transistor being coupled to a fixed electrodes of said first transistor comprising the output of said first switching means and being coupled to said capacitor; the base electrode of said second transistor being coupled to the output of said first switching means, one of said emitter and collector electrodes of said second transistor being coupled to said fixed potential and the other of said emitter and collector electrodes of said second transistor comprising the output of said second switching means and being coupled to said first resistor; the base electrode of said third transistor being coupled to the output side of said rectifier-integrator, one of said emitter and collector electrodes being coupled to said fixed potential via a resistance potentiometer which provide tHe output of said third switching means and which is coupled to said first display lamp; the base electrode of said fourth transistor being coupled to the output of said first switching means, one of the emitter and collector electrodes of said fourth transistor being coupled to the output of said third switching means and the other of said emitter and collector electrodes of said fourth transistor being coupled to said second display lamp; and the base electrode of said fifth transistor being coupled to the output of said second switching means, one of the emitter and collector electrodes of said fifth transistor being coupled to the output of said third switching means and the other of said emitter and collector electrodes of said fifth transistor being coupled to said third display lamp, said third, fourth and fifth transistors selectively operating said first, second and third display lamps, respectively.