Two intensity indicator lamp control system

Claim 2

An indicating system comprising: a voltage source having first and second terminals; first and second incandescent lamps each having first and second terminals, the rated current of the first lamp related to the rated current of the second lamp such that the second lamp presents negligible resistance to an energizing current approximately equal to the rated current of the first lamp, the first terminal of the first lamp connected to the first terminal of the voltage source and the second terminal of the second lamp connected to the second terminal of the voltage source; a resistor connected between the second terminal of the first lamp and the second terminal of the voltage source; a rectifier connected between the second terminal of the first lamp and the first terminal of the second lamp; and switching means connected between the first terminal of the second lamp and the first terminal of the voltage source, the switching means operable in a first position to forward bias the rectifier to energize the first lamp with an energizing current approximately equal to its rated current through the second lamp which provides negligible resistance to the energizing current so that the first lamp is illuminated at a relatively high intensity, and the switching means operable in the second position to reverse bias the rectifier to energize the first lamp with an energizing current considerably less than its rated current through the resistor which provides a substantial resistance to the energizing current so that the first lamp is illuminated at a relatively low intensity.

Claim 3

An indicating system comprising: a voltage source; a first network including first switching means, a first incandescent lamp, and a resistor effectively connected in series across the voltage source; a second network including second switching means and a second incandescent lamp effectively connected in series across the voltage source; and a third network including the first switching means, the first incadescent lamp, a rectifier and the second incadescent lamp effectively connected in series across a voltage source; the first and second switching means each having a first position and a second position, the first switching means operable in the second position and the second switching means operable in the first position to forward bias the rectifier to energize the third network from the voltage source, and the first switching means operable in the second position and the second switching means operable in the second position to reverse bias the rectifier to energize the first and second networks from the voltage source; the first and second incandescent lamps each having different rated currents such that the rated current of the second lamp is not less than approximately three times the rated current of the first laMp, the energization of the third network thereby producing a voltage across the first lamp which is approximately equal to the nominal voltage of the voltage source minus the voltage drop across the rectifier and the second incandescent lamp to illuminate the first lamp at a relatively high intensity due to the negligible resistance provided by the second lamp, the energization of the first network thereby producing a voltage across the first lamp which is approximately equal to the nominal voltage of the voltage source minus the voltage drop across the resistor to illuminate the first lamp at a relatively low intensity due to the substantial resistance presented by the resistor, and the energization of the second network thereby producing a voltage across the second lamp which is approximately equal to the nominal voltage of the voltage source to illuminate the second lamp at a relatively high intensity.

Claim 4

An indicating system comprising: a voltage source; a first network including first switching means, a first incandescent lamp, and a resistor effectively connected in series across the voltage source; a second network including second switching means and a second incandescent lamp effectively connected in series across the voltage source; and a third network including the first switching means, the first incadescent lamp, a rectifier and the second incadescent lamp effectively connected in series across a voltage source; the first and second switching means each having a first position and a second position, the first switching means operable in the second position and the second switching means operable in the first position to forward bias the rectifier to energize the third network from the voltage source, and the first switching means operable in the second position and the second switching means operable in the second position to reverse bias the rectifier to energize the first and second networks from the voltage source; the first and second incandescent lamps each having different rated currents such that the rated current of the second lamp is not less than approximately three times the rated current of the first laMp, the energization of the third network thereby producing a voltage across the first lamp which is approximately equal to the nominal voltage of the voltage source minus the voltage drop across the rectifier and the second incandescent lamp to illuminate the first lamp at a relatively high intensity due to the negligible resistance provided by the second lamp, the energization of the first network thereby producing a voltage across the first lamp which is approximately equal to the nominal voltage of the voltage source minus the voltage drop across the resistor to illuminate the first lamp at a relatively low intensity due to the substantial resistance presented by the resistor, and the energization of the second network thereby producing a voltage across the second lamp which is approximately equal to the nominal voltage of the voltage source to illuminate the second lamp at a relatively high intensity.

Claim 5

An indicating system comprising: a voltage source having first and second terminal across which a voltage is provided; a first incandescent lamp having a first rated current and a second incandescent lamp having a second rated current, the first rated current being not more than one-third the second rated current; the first and second incandescent lamps each having first and second terminals, the second terminal of the second lamp connected to the second terminal of the voltage source; a rectifier connected between the second terminal of the first lamp and the first terminal of the second lamp; a resistor connected between the second terminal of the first lamp and the second terminal of the voltage source; and first and second switching means each having first and second positions, the first switching means connected between the first terminal of the first lamp and the first terminal of the voltage source, the second switching means connected between the first terminal of the second lamp and the first terminal of the voltage source, the first switching means operable in the second position and the second switching means operable in the first position to forward bias the rectifier to energize the first lamp with an energizing current approximately equal to its rated current through the second lamp which provides negligible resistance to the energizing current so that the first lamp is illuminated at a relatively high intensity; and the first switching means operable in the second position and the second switching means operable in the second position and the second switching means operable in the second position to reverse bias the rectifier to energize the first lamp and the second lamp, the first lamp energized with an energizing current considerably less than its rated current through the resistor which provides a substantial resistance to the energizing current so that the first lamp is illuminated at a relatively low intensity, and the second lamp energized with an energizing current approximately equal to its rated current so that the second lamp is illuminated at a relatively high intensity.

Claim 6

An indicating system comprising: a voltage source having first and second terminal across which a voltage is provided; a first incandescent lamp having a first rated current and a second incandescent lamp having a second rated current, the first rated current being not more than one-third the second rated current; the first and second incandescent lamps each having first and second terminals, the second terminal of the second lamp connected to the second terminal of the voltage source; a rectifier connected between the second terminal of the first lamp and the first terminal of the second lamp; a resistor connected between the second terminal of the first lamp and the second terminal of the voltage source; and first and second switching means each having first and second positions, the first switching means connected between the first terminal of the first lamp and the first terminal of the voltage source, the second switching means connected between the first terminal of the second lamp and the first terminal of the voltage source, the first switching means operable in the second position and the second switching means operable in the first position to forward bias the rectifier to energize the first lamp with an energizing current approximately equal to its rated current through the second lamp which provides negligible resistance to the energizing current so that the first lamp is illuminated at a relatively high intensity; and the first switching means operable in the second position and the second switching means operable in the second position and the second switching means operable in the second position to reverse bias the rectifier to energize the first lamp and the second lamp, the first lamp energized with an energizing current considerably less than its rated current through the resistor which provides a substantial resistance to the energizing current so that the first lamp is illuminated at a relatively low intensity, and the second lamp energized with an energizing current approximately equal to its rated current so that the second lamp is illuminated at a relatively high intensity.

Claim 7

In a radio receiver capable of operating in a stereo reception mode, an indicating system comprising: a voltage source having first and second terminals across which a voltage is provided; a first incandescent lamp for indicating that the radio receiver is operating in a stereo reception mode when illuminated, the first lamp having first and second terminals and having a first rated current; a second incandescent lamp for lighting the tuning dial of the radio receiver when illuminated, the second lamp having first and second terminals and a second rated current, the second terminal of the second lamp connected to the second terminal of the voltage source; a rectifier connected between the second terminal of the first lamp and the first terminal of the second lamp; a resistor connected between the second terminal of the first lamp and the second terminal of the voltage source; first condition responsive switching means including a first control switch having open and cLosed portions, the first control switch connected between the first terminal of the first lamp and the first terminal of the voltage source and shiftable from the open position to the closed position in response to operation of the radio receiver in a stereo reception mode thereby to apply a voltage from the voltage source to the first lamp; second condition responsive means including a second control switch having opened and closed positions, the second control switch connected between the first terminal of the second lamp and the first terminal of the voltage source and shiftable from the opened position to the closed position in response to the location of the radio receiver in the darkened environment thereby to apply a voltage from the voltage source to the second lamp; the second rated current of the second incandescent lamp being not less than approximately three times the first rated current of the first incandescent lamp, the voltage applied to the first lamp by the first condition responsive switching means thereby forward biasing the rectifier to energize the first lamp with an energizing current approximately equal to its rated current through the second lamp which provides negligible resistance to the energizing current so that the first lamp is illuminated at a relatively high intensity, and the voltage applied to the second lamp by the second condition responsive switching means thereby reverse biasing the rectifier to energize the first lamp with an energizing current considerably less than its rated current through the resistor which provides a substantial resistance to the energizing current so that the first lamp is illuminated at a relatively low intensity and to energize the second lamp with an energizing current approximately equal to its rated current so that the second lamp is illuminated at a relatively high intensity.

Claim 8

In a radio receiver capable of operating in a stereo reception mode, an indicating system comprising: a voltage source having first and second terminals across which a voltage is provided; a first incandescent lamp for indicating that the radio receiver is operating in a stereo reception mode when illuminated, the first lamp having first and second terminals and having a first rated current; a second incandescent lamp for lighting the tuning dial of the radio receiver when illuminated, the second lamp having first and second terminals and a second rated current, the second terminal of the second lamp connected to the second terminal of the voltage source; a rectifier connected between the second terminal of the first lamp and the first terminal of the second lamp; a resistor connected between the second terminal of the first lamp and the second terminal of the voltage source; first condition responsive switching means including a first control switch having open and cLosed portions, the first control switch connected between the first terminal of the first lamp and the first terminal of the voltage source and shiftable from the open position to the closed position in response to operation of the radio receiver in a stereo reception mode thereby to apply a voltage from the voltage source to the first lamp; second condition responsive means including a second control switch having opened and closed positions, the second control switch connected between the first terminal of the second lamp and the first terminal of the voltage source and shiftable from the opened position to the closed position in response to the location of the radio receiver in the darkened environment thereby to apply a voltage from the voltage source to the second lamp; the second rated current of the second incandescent lamp being not less than approximately three times the first rated current of the first incandescent lamp, the voltage applied to the first lamp by the first condition responsive switching means thereby forward biasing the rectifier to energize the first lamp with an energizing current approximately equal to its rated current through the second lamp which provides negligible resistance to the energizing current so that the first lamp is illuminated at a relatively high intensity, and the voltage applied to the second lamp by the second condition responsive switching means thereby reverse biasing the rectifier to energize the first lamp with an energizing current considerably less than its rated current through the resistor which provides a substantial resistance to the energizing current so that the first lamp is illuminated at a relatively low intensity and to energize the second lamp with an energizing current approximately equal to its rated current so that the second lamp is illuminated at a relatively high intensity.