Light modulator system and method

• US 4,309,639 A
• Filed: 09/24/1979
• Issued: 01/05/1982
• Est. Priority Date: 09/24/1979
• Status: Expired due to Term

• Current Assignee: Sound Intellectual Property PLLC
• Original Assignee: Donald S. Wasness, Herbert T. Thrower Jr
• Inventors: Wasness, Donald S., Thrower, Herbert T. Jr.
• Primary Examiner(s): Chatmon, Jr., Saxfield
• Application Number:
  US06/078,388
• Time in Patent Office: 834 Days
• Field of Search: 315/200 A, 315/82, 315/83, 307/269, 307/10 LS, 362/72, 362/74, 362/80
• US Class Current: 315/82
• CPC Class Codes: B60Q 1/1415 Dimming circuits
• CPC Class Codes: H05B 39/044 continuously H05B39/042 takes precedence
• CPC Class Codes: Y02B 20/00 Energy efficient lighting technologies, e.g. halogen lamps or gas discharge lamps

Abstract

A system for modulating an incandescent light to avoid total loss of illumination and to achieve improved conspicuity of the light along with subjective enhanced illumination. The modulating unit is electrically connected between a source of electrical power and the light to be modulated and includes a timer switch means operating at a duty cycle of at least 30 percent and a switching frequency of from about 2 to about 10 cycles per second, an amplifier transistor and a driver transistor, electrically connected thereto. Preferably the modulating unit is encapsulated to preclude effects of temperature, humidity and weather.

Claims

1. An improved light modulator system for an incandescent light comprising:

(a) a timer switch means electrically connectable to a source of electric power, said timer switch means being adapted for operation at a combination of a switching frequency of from 2 to 10 cycles per second, and a duty cycle of at least 30 percent;

(b) an amplifier transistor electrically connected to an output of said timer switch means; and

(c) a driver transistor electrically connected to said amplifier transistor and being electrically connectable between said source of electrical power and said light whereby during operation when said system is connected between said source of power and said light, said light is turned on and off with such frequency that improved conspicuity and subjective light enhancement result without a total loss of luminescence of the light.

2. The system as defined in claim 1 wherein the duty cycle of the timer switch means is at least 50 percent and the amplifier transistor is an NPN transistor.

3. The system as defined in claim 1 wherein the duty cycle is less than 50 percent and the amplifier transistor is a PNP transistor.

4. The system as defined in claim 1 wherein the timer switch means is an integrated circuit timer switch means with pin connections;

said timer and switch means having a pair of resistors and a capacitor in series therewith, selection of the value of said resistors determining the duty cycle of said timer switch means and selection of the value of the resistors and the capacitor determining the switching frequency of the timer switch means.

5. The system as defined in claim 1 further comprising noise suppression means in electrical association with said driver transistor.

6. The system as defined in claim 5 wherein the noise suppression means is a capacitor connected across the base and collector of said driver transistor.

7. The system as defined in claim 1 wherein the system is encapsulated in a polymeric material.

8. A vehicular light modulation system comprising:

(a) a source of electrical power;

(b) at least one vehicular light in electrical connection with said source of electrical power;

(c) switch means located along said electrical connection between said source of electrical power and said at least one light, said switch means having a low beam output and a high beam output; and

(d) a modulating unit electrically connected between the high beam output of said switch means and said at least one light, said unit comprising a timer switch means operating at a combination duty cycle of at least 30 percent and switching frequency of from 2 to 10 cycles per second, an amplifier transistor in electrical connection with the output of said timer switch means and a driver transistor in electrical connection with said amplifier transistor, and in line between said high beam output of said switch means and said light, whereby when said switch means is actuated for high beam output, said modulating unit interrupts power to said light at a rate coincident with the switching frequency of said timer switch means to modulate intensity of said light and realize improved conspicuity and subjective illumination enhancement of said light without a total loss of luminescence of the light.

9. The system as defined in claim 8 wherein said modulating unit has noise suppression means associated therewith.

10. A method of modulating an incandescent light to realize improved conspicuity of the light and subjective enhancement of illumination of the light comprising the steps of including a switching means between the light and a source of electrical power, said switching means operating at a combination duty cycle of at least 30 percent and a switching frequency in range 0f from 2 to 10 cycles per second, whereby said light is modulated at a rate that total loss of illumination is avoided.

11. The method as defined in claim 10 wherein the duty cycle and switching frequency are selected to maintain temperature of the light filament above about 1200°

C.

12. The method as defined in claim 10 wherein noise is suppressed during modulation of the light.

13. The method as defined in claim 10 wherein the light is a vehicular headlight.

14. An improved light modulator system for an incandescent light comprising:

(a) switching means connectable between a source of electrical power and said light, said switching means being operable at a combination duty cycle of at least 30 percent and a switching frequency in a range of from 2 to 10 cycles per second, whereby said light is modulated with such frequency that improved conspicuity and subjective light enhancement result without a total loss of luminescence of the light.

15. The system as defined in claim 14 wherein the switching means comprises a timer switch means, amplifier means and power interrupter means.

16. The system as defined in claim 15 wherein the timer switch means is an integrated circuit timer switch means with pin connections;

said timer switch means having a pair of resistors and a capacitor in series therewith, selection of the value of said resistors determining the duty cycle of said timer switch means and selection of the value of the resistors and the capacitor determining the switching frequency of the timer switch means.

17. The system as defined in claim 15 wherein the timer switch means is a multivibrator.

18. The system as defined in claim 15 wherein the amplifier means is a transistor.

19. The system as defined in claim 15 wherein the power interrupter means is a driver transistor.

20. An improved light modulator system for a vehicle light comprising switching means connectable between a source of electrical power and said light, said switching means being operable at a duty cycle of at least 30 percent and a switching frequency in a range of from about 4 to about 6 cycles per second, said switching means comprising timing means associated with power interrupter means, whereby during operation, power to said light is interrupted at a rate of from about 4 to about 6 times per second at a duty cycle of at least 30 percent whereby improved light conspicuity and subjective light enhancement result.