Optical fiber light emitting apparatus

• US 5,542,016 A
• Filed: 01/13/1995
• Issued: 07/30/1996
• Est. Priority Date: 05/05/1993
• Status: Expired due to Fees

• Current Assignee: Motorola, Inc. (Motorola Solutions, Inc.)
• Original Assignee: Motorola, Inc. (Motorola Solutions, Inc.)
• Inventors: Kaschke, Kevin D.
• Primary Examiner(s): Lee, John D.
• Assistant Examiner(s): Palmer, Phan T. H.
• Application Number:
  US08/374,385
• Time in Patent Office: 564 Days
• Field of Search: 385/123, 385/115, 385/116, 385/117, 385/120, 385/147, 385/901, 362/32
• US Class Current: 385/123
• 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: G02B 6/3608 Fibre wiring boards, i.e. where fibres are embedded or attached in a pattern on or to a substrate, e.g. flexible sheets optical ribbon cables in support members G02B6/4401
• CPC Class Codes: G02B 6/3668 with conversion in geometry of the cross section
• CPC Class Codes: G09F 9/305 being the ends of optical fibres G09F9/302 takes precedence
• CPC Class Codes: H01H 2219/0621 Optical fiber light conductor
• CPC Class Codes: H04M 1/22 Illumination; Arrangements for improving the visibility of characters on dials
• CPC Class Codes: Y10S 385/901 Illuminating or display apparatus

Abstract

An optical fiber light emitting apparatus (200) comprises at least one optical fiber (201) arranged in a repeating, recurrent pattern extending substantially throughout a predetermined area (206). The optical fiber (201) has a plurality of locations along the length thereof permitting light entering at least one end of the optical fiber (201) for transmission therein to be selectively emitted by the optical fiber (201) at the plurality of locations (210) for producing substantially uniform illumination substantially throughout the predetermined area (206). The repeating, recurrent pattern may form a spiral or serpentine pattern, for example. The repeating, recurrent pattern eliminates the space required for the fan-in arrangement (115) of prior art optical fiber light emitting panels (100). The optical fiber light emitting apparatus (200) is beneficial for illuminating keypads (613) and displays (611) in electronic devices (600), such as portable radio telephones, having limited space available.

Claims

1. An optical fiber light emitting apparatus comprising:

at least one optical fiber arranged in a continuous, nonlinear pattern along a common path so that the at least one optical fiber extends substantially throughout a predetermined area, the pattern arranged to be substantially parallel to the predetermined area, the at least one optical fiber having a plurality of locations along the length thereof permitting light entering at least a first end of the at least one optical fiber for transmission therein to be selectively emitted by the at least one optical fiber at the plurality of locations for producing substantially uniform illumination substantially throughout the predetermined area.

2. An optical fiber light emitting apparatus according to claim 1 further comprising a carrier forming a support for holding the at least one optical fiber in the continuous, nonlinear pattern.

3. An optical fiber light emitting apparatus according to claim 1 wherein the continuous, nonlinear pattern is a spiral pattern.

4. An optical fiber light emitting apparatus according to claim 1 wherein the continuous, nonlinear pattern is a serpentine pattern.

5. An optical fiber light emitting apparatus according to claim 1 wherein the at least one optical fiber further comprises a plurality of optical fiber strands bundled together.

6. An optical fiber light emitting apparatus according to claim 1 further comprising a reflector for redirecting at least a portion of the light emitted by the plurality of locations.

7. An optical fiber light emitting apparatus according to claim 1 further comprising a diffuser for diffusing at least a portion of the light emitted by the plurality of locations.

8. An optical fiber light emitting apparatus according to claim 1 further comprising a light source for transmitting light into the first end of the at least one optical fiber.

9. A keypad comprising:

a plurality of keys positioned substantially throughout a predetermined area;

at least one optical fiber arranged in a repeating, recurrent pattern so that the at least one optical fiber extends substantially throughout the predetermined area, the pattern arranged to be substantially parallel to the predetermined area, the at least one optical fiber having a plurality of locations along the length thereof permitting light entering at least a first end of the at least one optical fiber for transmission therein to be selectively emitted by the at least one optical fiber at the plurality of locations for producing substantially uniform illumination for the plurality of keys positioned substantially throughout the predetermined area;

a reflector for redirecting at least a portion of the light emitted by the plurality of locations; and

a diffuser for diffusing at least a portion of the light emitted by the plurality of locations.

10. A keypad according to claim 9 wherein the repeating, recurrent pattern is disposed substantially between the keys.

11. A keypad according to claim 9 wherein repeating, recurrent pattern is disposed substantially beneath the keys.

12. A keypad according to claim 9 wherein the plurality of locations correspond to the position of the keys.

13. A display comprising:

positions for information to be presented substantially throughout a predetermined area;

at least one optical fiber arranged in a repeating, recurrent pattern so that the at least one optical fiber extends substantially throughout the predetermined area, the pattern arranged to be substantially parallel to the predetermined area, the at least one optical fiber having a plurality of locations along the length thereof permitting light entering at least a first end of the at least one optical fiber for transmission therein to be selectively emitted by the at least one optical fiber at the plurality of locations for producing substantially uniform illumination for the positions for information substantially throughout the predetermined area;

a reflector for redirecting at least a portion of the light emitted by the plurality of locations; and

a diffuser for diffusing at least a portion of the light emitted by the plurality of locations.

14. A display according to claim 13 wherein the plurality of locations correspond to the positions for the information.

15. An electronic device comprising:

a display having positions for presenting information substantially throughout a first predetermined area;

a keypad having a plurality of keys positioned substantially throughout a second predetermined area; and

at least one optical fiber arranged in a repeating, recurrent pattern so that the at least one optical fiber extends substantially throughout at least one of the first and second predetermined areas, the pattern arranged to be substantially parallel to the at least one of the first and second predetermined areas, the at least one optical fiber having a plurality of locations along the length thereof permitting light entering at least a first end of the at least one optical fiber for transmission therein to be selectively emitted by the at least one optical fiber at the plurality of locations for producing substantially uniform illumination for at least one of the positions for presenting the information and the plurality of keys positioned substantially throughout the first and second predetermined areas, respectively.

16. A communication unit comprising:

a receiver for receiving signals representing information;

a display having information positions for presenting the information substantially throughout a predetermined area; and

at least one optical fiber arranged in a repeating, recurrent pattern so that the at least one optical fiber extends substantially throughout the predetermined area, the pattern arranged to be substantially parallel to the predetermined area, the at least one optical fiber having a plurality of locations along the length thereof permitting light entering at least a first end of the at least one optical fiber for transmission therein to be selectively emitted by the at least one optical fiber at the plurality of locations for producing substantially uniform illumination for the information positions substantially throughout the predetermined area.

17. A communication unit comprising:

a transmitter for transmitting signals representing information;

a plurality of keys positioned substantially throughout a predetermined area for inputting the information; and

at least one optical fiber arranged in a repeating, recurrent pattern so that the at least one optical fiber extends substantially throughout the predetermined area, the pattern arranged to be substantially parallel to the predetermined area, the at least one optical fiber having a plurality of locations along the length thereof permitting light entering at least a first end of the at least one optical fiber for transmission therein to be selectively emitted by the at least one optical fiber at the plurality of locations for producing substantially uniform illumination for the plurality of keys positioned substantially throughout the predetermined area.

18. A communication unit comprising:

a receiver for receiving signals representing received information;

a display having information positions for presenting the received information substantially throughout a first predetermined area;

a transmitter for transmitting signals representing transmitted information;

a plurality of keys positioned substantially throughout a second predetermined area for inputting the transmitted information; and

at least one optical fiber arranged in a repeating, recurrent pattern so that the at least one optical fiber extends substantially throughout at least one of the first and second predetermined areas, the pattern arranged to be substantially parallel to the at least one of the first and second predetermined areas, the at least one optical fiber having a plurality of locations along the length thereof permitting light entering at least a first end of the at least one optical fiber for transmission therein to be selectively emitted by the at least one optical fiber at the plurality of locations for producing substantially uniform illumination for at least one of the information positions and plurality of keys positioned substantially throughout the first and second predetermined areas, respectively.

19. An optical fiber light emitting apparatus comprising:

at least one optical fiber for transmitting light therein, the at least one optical fiber having at least one light receiving input for receiving the light from a light source, the at least one optical fiber having a plurality of light emitting outputs for selectively emitting the light transmitted within the at least one optical fiber, the at least one optical fiber arranged in a continuous, nonlinear pattern along a common path so that the at least one optical fiber extends substantially throughout a predetermined area to provide substantially uniform illumination of the predetermined area, the at least one optical fiber having a plurality of bends being substantially parallel to a plane of illumination of the predetermined area.

20. An optical fiber light emitting apparatus according to claim 19 wherein the pattern formed by the arrangement of the at least one optical fiber is a repeating recurrent pattern.

21. An optical fiber light emitting apparatus according to claim 19 wherein the pattern formed by the arrangement of the at least one optical fiber is a spiral pattern.

22. An optical fiber light emitting apparatus according to claim 19 wherein the pattern formed by the arrangement of the at least one optical fiber is a serpentine pattern.

23. An optical fiber light emitting apparatus comprising:

only one optical fiber for transmitting light therein, the only one optical fiber having a light receiving input for receiving the light from a light source, the only one optical fiber having a plurality of light emitting outputs for selectively emitting the light transmitted within the only one optical fiber, the only one optical fiber arranged in a continuous, nonlinear pattern along a common path so that the only one optical fiber extends substantially throughout a predetermined area substantially parallel to the pattern to provide substantially uniform illumination of the predetermined area.

24. An optical fiber light emitting apparatus according to claim 23 wherein the pattern formed by the arrangement of the one optical fiber further comprises a plurality of bends being substantially parallel to the plane of illumination of the predetermined area.

25. An optical fiber light emitting apparatus according to claim 23 wherein the pattern formed by the arrangement of the one optical fiber is a repeating recurrent pattern.

26. An optical fiber light emitting apparatus according to claim 23 wherein the pattern formed by the arrangement of the one optical fiber is a spiral pattern.

27. An optical fiber light emitting apparatus according to claim 23 wherein the pattern formed by the arrangement of the one optical fiber is a serpentine pattern.

28. An optical fiber light emitting apparatus comprising:

at least one optical fiber arranged in a continuous, nonlinear pattern along a common path, repeatedly turning back in a direction essentially opposite to a former course, so that the at least one optical fiber extends substantially throughout a predetermined area, the pattern arranged to be substantially parallel to the predetermined area, the at least one optical fiber having a plurality of locations along the length thereof permitting light, entering at least a first end of the at least one optical fiber for transmission therein, to be selectively emitted by the at least one optical fiber at the plurality of locations for producing substantially uniform illumination substantially throughout the predetermined area.