DRIVING LAMPS BY INDUCTION

• US 3,745,410 A
• Filed: 03/16/1972
• Issued: 07/10/1973
• Est. Priority Date: 03/16/1972
• Status: Expired due to Term

• Current Assignee: Helmuth H. Laue, Leonard G. Clough
• Original Assignee: Helmuth H. Laue, Leonard G. Clough
• Inventors: Laue, Helmuth H., Clough, Leonard G.
• Primary Examiner(s): Brody, Alfred L.
• Application Number:
  US05/235,269
• Time in Patent Office: 481 Days
• Field of Search: 315/248,324 313/161
• US Class Current: 315/248
• CPC Class Codes: H05B 41/24 in which the lamp is fed by high frequency ac, or with separate oscillator frequencyH05B41/26 takes precedence

Abstract

An electrodeless lamp circuit with a coil surrounding a krypton lamp driven by an RF input source tapped across an end part of the coil and with a coil surrounding a mercury lamp tapped across the connection of the input central to the krypton-lamp coil and a point of the krypton-lamp coil electrically away from both input connections. Each coil is connected in parallel with separate capacitors which form resonant circuits at the input frequency.

Claims

1. A system for driving lamps by induction comprising:

a first lamp adapted to be driven for production of electromagnetic radiation by induction from an electrical coil;

a first coil positioned to drive said lamp for said production of radiation;

first capacitive means electrically connected across said coil of a magnitude to form a resonant circuit with said coil when said lamp is being driven and producing said radiation at a given radio frequency;

a power source operative at said radio frequency connected across a part only of said first coil;

a second lamp adapted to be driven for production of electromagnetic radiation by induction from an electrical coil;

a second coil positioned to drive said second lamp for said production of radiation;

second capacitive means electrically connected across said second coil of a magnitude to form a resonant circuit with said second coil when said lamp is being driven and producing said radiation at said radio frequency, said second coil being connected electrically across said first coil at locations at least one of which is electrically separated from the part of said first coil across which said power source is connected.

2. The system as in claim 1 in which said second coil is connected at locations across said first coil at which said second capacitive means is inherently supplied by said first coil and said second coil.

3. The system as in claim 1 in which the radiation producing material of said first lamp consists essentially of krypton and the radiation producing material of said second lamp consists essentially of mercury.

4. The system as in claim 3 in which said second coil is connected substantially across one of said connections of said power source to said first coil and said electrically separated location.