Light emitting system

• US 3,909,670 A
• Filed: 06/25/1974
• Issued: 09/30/1975
• Est. Priority Date: 06/27/1973
• Status: Expired due to Term

• Current Assignee: Hisato Wakamatsu, Masao Kotera, Matatoyo Hinachi
• Original Assignee: Hisato Wakamatsu, Masao Kotera, Matatoyo Hinachi
• Inventors: Wakamatsu, Hisato, Hinachi, Matatoyo, Kotera, Masao
• Primary Examiner(s): Rolinec, R. V.
• Assistant Examiner(s): LaRoche, E. R.
• Application Number:
  US05/482,989
• Time in Patent Office: 462 Days
• Field of Search: 315/77,79,80,129,134-136,276,281 240/2.1,8.14,8.16,8.18,8.28,10.1,61.9,62B,62.4,DIG.3 340/52D,62,87,266,366A,366D,373 116/129,DIG.6,DIG.36
• US Class Current: 315/276
• CPC Class Codes: B60K 2360/698 Pointers of combined instruments
• CPC Class Codes: B60K 2370/698 Pointers of combined instruments
• CPC Class Codes: G01D 13/22 Pointers, e.g. settable pointer
• CPC Class Codes: G01P 1/08 Arrangements of scales, pointers, lamps or acoustic indicators, e.g. in automobile speedometers
• CPC Class Codes: G01R 1/08 Pointers; Scales; Scale illumination
• CPC Class Codes: G01R 1/20 Modifications of basic electric elements for use in electric measuring instruments; Structural combinations of such elements with such instruments
• CPC Class Codes: H01F 38/18 Rotary transformers

Abstract

There is provided a light emitting system comprising an oscillator for generating oscillations at a high frequency, a fixed coil adapted to be energized by the output of the oscillator, a movable coil electromagnetically coupled with the fixed coil and adapted to be energized by the intermittent energization of the fixed coil, and a light emitting element connected to the movable coil to form a closed circuit and adapted to give light by an exciting current produced by the energization of the movable coil. The system thus eliminates the use of any mechanical sliding contact unit.

Claims

1. A light emitting system comprising:

a fixed member;

an oscillator mounted on said fixed member oscillating at a high frequency;

a fixed coil mounted on said fixed member and connected electrically to the output terminals of said oscillator, said fixed coil being energized by the output thereof;

a power source mounted on said fixed member and connected to said oscillator to supply power thereto;

a moving member movable relative to said fixed coil;

a movable coil mounted on said moving member and electromagnetically coupled with said fixed coil; and

a light emitting element mounted on said moving member and connected to said movable coil to generate light be na excitation current from said movable coil.

2. A system according to claim 1, wherein said oscillator comprises an oscillator circuit composed of a ring oscillator having an odd number of NOT circuit stages connected in a circle, and an amplifier circuit for amplifying the output of said oscillator circuit.

3. A system according to claim 1, wherein said light emitting element is comprised of a light emitting diode.

4. A system according to claim 1, wherein said fixed member constitutes part of a vehicle body, and said moving member is comprised of a control knob mounted in the vehicle.

5. A system according to claim 4, wherein said light emitting element is comprised of a light emitting diode.

6. A system according to claim 1, wherein said fixed member constitutes part of a vehicle body, and said moving member constitutes a needle of a meter installed in the vehicle.

7. A system according to claim 6, wherein said light emitting element is comprised of a light emitting diode.