Fiber optic lighting system

• US 5,669,692 A
• Filed: 11/17/1995
• Issued: 09/23/1997
• Est. Priority Date: 11/17/1995
• Status: Expired due to Fees

• Current Assignee: Timex Corporation (Tanager Group BV)
• Original Assignee: Timex Corporation (Tanager Group BV)
• Inventors: Daigle, Lyman, Bhan, Surendar K., Thorgersen, Harold, Ledesma, Andrew C., Santana, Jose
• Primary Examiner(s): Sember, Thomas M.
• Application Number:
  US08/560,065
• Time in Patent Office: 676 Days
• Field of Search: 362/26, 362/32, 362/29, 362/30, 362/23, 385/31, 385/123, 385/901, 385/32, 116/286, 116/287, 116/288, 116/DIG. 5, 116/DIG. 36
• US Class Current: 362/556
• CPC Class Codes: G02B 6/001 the light being emitted along at least a portion of the lateral surface of the fibre
• CPC Class Codes: G04B 19/30 Illumination of dials or hands dials in general G04B19/06; moving indicating means with numbers or hands, in general G04B19/20; arrangements for indicating different local apparent times by means of a globe illuminated from inside G04B19/22; continuous indication of the time by non-electric light sources G04B25/00, e.g. by electric lamps G04C17/02; illumination by electric lamps which function at fixed times or periodically G04C19/02; illuminated panels G09F13/00
• CPC Class Codes: Y10S 385/901 Illuminating or display apparatus

Abstract

A lighting system utilizing an optical fiber is provided. In the preferred embodiment of the present invention, light rays from a light source are focused into an outer end of the optical fiber wound in a spiral shape. The light rays are focused in by a ball lens. In one embodiment, the spiral shape optical fiber is enclosed by a casing having a reflective inner surface along the periphery and the bottom; however, there is an aperture in the casing to permit light rays from the light source to reach the outer end of the spiral shape optical fiber.

Claims

1. A lighting system, which comprises:

an optical fiber comprising a core and cladding, where a refractive index of the core is higher than a refractive index of the cladding;

the optical fiber being wound in a spiral shape comprising a plurality of turns, where the spiral shape optical fiber has an outer end;

a light source;

means for focusing the light from the light source to the core at the outer end of the spiral shape optical fiber; and

a casing enclosing the spiral shape optical fiber along a periphery and a bottom, except for an aperture to permit the core at the outer end of the spiral shape optical fiber to receive light from the light source, the casing having a reflective inner surface.

2. The lighting system according to claim 1, wherein the light source is an incandescent lamp.

3. The lighting system according to claim 1, wherein the light source is a light emitting diode.

4. The lighting system according to claim 1, wherein the means for focusing the light comprises a ball lens.

5. The lighting system according to claim 1, wherein the reflective inner surface of the casing comprises a mirror.

6. The lighting system according to claim 1, wherein the reflective inner surface of the casing comprises an aluminum foil.

7. A backlighting system for illuminating a dial of a timepiece, which comprises:

an optical fiber wound in a spiral shape comprising a plurality of turns, where each turn is contiguous to at least one other turn, the spiral shape optical fiber having an outer end;

a light source;

means for focusing the light from the light source to the outer end of the spiral shape optical fiber;

a casing enclosing the spiral shape optical fiber along a periphery and a bottom, except for an aperture to permit the outer end of the spiral shape optical fiber to receive light from the light source, the casing having a reflective inner surface; and

the dial of the timepiece being positioned on top of the casing.

8. A lighting system for illuminating a dial of a timepiece, which comprises:

an optical fiber wound in a continuously curving spiral shape comprising a plurality of turns, where each turn is contiguous to at least one other turn, the spiral shape optical fiber having an outer end;

a light source;

means for focusing the light from the light source to the outer end of the spiral shape optical fiber; and

timekeeping indicia positioned directly on top of the spiral shape optical fiber.