Optoisolator comprising walls having photosensitive inner surfaces

• US 5,828,074 A
• Filed: 05/19/1997
• Issued: 10/27/1998
• Est. Priority Date: 05/19/1997
• Status: Expired due to Fees

• Current Assignee: Mini-Systems, Inc.
• Original Assignee: Mini-Systems, Inc.
• Inventors: Pearlman, Alan R.
• Primary Examiner(s): Westin, Edward P.
• Assistant Examiner(s): Lee, John R.
• Application Number:
  US08/858,279
• Time in Patent Office: 526 Days
• Field of Search: 250/551, 250/239, 250/214.1, 327/514, 327/515, 257/80, 257/81, 257/82
• US Class Current: 250/551
• CPC Class Codes: H01L 2224/48091 Arched
• CPC Class Codes: H01L 2924/00014 the subject-matter covered by the group, the symbol of which is combined with the symbol of this group, being disclosed without further technical details
• CPC Class Codes: H01L 31/0203 Containers; Encapsulations , e.g. encapsulation of photodiodesfor photovoltaic devices H01L31/048; for organic photosensitive devices H10K30/80
• CPC Class Codes: H01L 31/167 the light sources and the devices sensitive to radiation all being semiconductor devices characterised by potential barriers

Abstract

An optoisolator includes one or more light-emitting diodes (LEDs) within a compartment defined by walls of photocells, where the majority of light emitted by the LED impinges directly upon a photocell and is converted to electricity with a minimum of loss. The photocells are attached together by abutting the end of one photocell to the surface of another, as in a butt joint. In one embodiment, the LEDs is inserted into an opening in the compartment and secured by filling the compartment with a light-transmissive, non-conductive material. In another embodiment, the LEDs and photocells are mounted to a substrate. Optionally, each photocell has more than one electrically-independent photosensitive surface.

Claims

1. An optoisolator comprising:

(a) an enclosure including walls defining a compartment, each of said walls having an inner surface, said inner surface of at least two of said walls having a photosensitive portion, said photosensitive portions having different orientations with respect to each other, and each of said photosensitive portions producing at least one electrical signal when illuminated;

(b) a light source within said compartment providing light to illuminate said inner surfaces when said light source is energized;

(c) electrical contacts for providing electricity to energize said light source; and

(d) electrical contacts for receiving said at least one electrical signal from said photosensitive portions.

2. The optoisolator of claim 1 wherein said photosensitive portion of each of said inner surfaces is a single contiguous photosensitive area producing an electrical signal when illuminated.

3. The optoisolator of claim 1 wherein said photosensitive portion of each of said inner surfaces includes a plurality of electrically-isolated photosensitive areas, each of said photosensitive areas producing an independent electrical signal when illuminated.

4. The optoisolator of claim 1 wherein each of said walls is a photocell.

5. The optoisolator of claim 1 wherein the junction of each pair of adjacent walls is formed by an edge of a first of said pair of adjacent walls abutting said inner surface of a second of said pair of adjacent walls such that said inner surface of said first of said pair of adjacent walls extends outside of said compartment.

6. The optoisolator of claim 1 wherein said light source is at least one light-emitting diode.

7. The optoisolator of claim 1 wherein said compartment is substantially filled with a light-transmissive, non-electrically-conductive material.

8. The optoisolator of claim 1 wherein said compartment has an opening through which said light source electrical contacts extend out of said compartment, and wherein a light-transmissive, non-electrically-conductive material fills said compartment and secures said light source within said compartment.

9. The optoisolator of claim 1 wherein said light source and said enclosure are mounted on a substrate, said substrate providing a floor for said compartment, said floor having an inner surface in said compartment.

10. The optoisolator of claim 9 wherein said floor inner surface includes at least one photosensitive portion illuminated by said light source and that produces an electrical signal when illuminated.

11. An optoisolator comprising:

(a) an enclosure including walls composed substantially of photocells and defining a compartment, each of said photocells having a photosensitive inner surface that is a single contiguous photosensitive area producing an electrical signal when illuminated;

(b) at least one light-emitting diode within said compartment providing light to illuminate said photosensitive inner surfaces when said at least one light-emitting diode is energized;

(c) electrical contacts for providing electricity to energize said at least one light-emitting diode; and

(d) electrical contacts for receiving said electrical signals from said photosensitive inner surfaces.

12. The optoisolator of claim 11 wherein the junction of each pair of adjacent walls is formed by an edge of a first of said pair of adjacent walls abutting said inner surface of a second of said pair of adjacent walls such that said inner surface of said first of said pair of adjacent walls extends outside of said compartment.

13. The optoisolator of claim 11 wherein said compartment is substantially filled with a light-transmissive, non-electrically-conductive material.

14. The optoisolator of claim 11 wherein said compartment has an opening through which said light-emitting diode electrical contacts extend out of said compartment, and wherein a light-transmissive, non-electrically-conductive material fills said compartment and secures said at least one light-emitting diode within said compartment.

15. The optoisolator of claim 11 wherein said at least one light-emitting diode and said enclosure are mounted on a substrate, said substrate providing a floor for said compartment, said floor having an inner surface in said compartment.

16. The optoisolator of claim 15 wherein said floor inner surface includes at least one photosensitive portion illuminated by said at least one light-emitting diode and that produces an electrical signal when illuminated.

17. An optoisolator comprising:

(a) an enclosure including walls composed substantially of photocells and defining a compartment, each of said photocells having a photosensitive inner surface that is a single contiguous photosensitive area producing an electrical signal when illuminated;

(b) the junction of each pair of adjacent walls is formed by an edge of a first of said pair of adjacent walls abutting said inner surface of a second of said pair of adjacent walls such that said inner surface of said first of said pair of adjacent walls extends outside of said compartment;

(c) at least one light-emitting diode within said compartment providing light to illuminate said photosensitive inner surfaces when said at least one light-emitting diode is energized;

(d) electrical contacts for providing electricity to energize said at least one light-emitting diode;

(e) electrical contacts for receiving said electrical signals from said photosensitive inner surfaces; and

(f) said compartment having an opening through which said light-emitting diode electrical contacts extend out of said compartment, and wherein said at least one light-emitting diode is secured within said compartment by a light-transmissive, non-electrically-conductive material that substantially fills said compartment.

18. An optoisolator comprising:

(a) an enclosure including at least three walls defining a compartment, each of said walls having an inner surface, each of said inner surfaces having a photosensitive portion, said photosensitive portions having different orientations with respect to each other, and each of said photosensitive portions producing at least one electrical signal when illuminated;

(b) a light source within said compartment providing light to illuminate said inner surfaces when said light source is energized;

(c) electrical contacts for providing electricity to energize said light source; and

(d) electrical contacts for receiving said at least one electrical signal from said photosensitive portions.

19. The optoisolator of claim 18 wherein said photosensitive portion of each of said inner surfaces is a single contiguous photosensitive area producing an electrical signal when illuminated.

20. The optoisolator of claim 18 wherein said photosensitive portion of each of said inner surfaces includes a plurality of electrically-isolated photosensitive areas, each of said photosensitive areas producing an independent electrical signal when illuminated.

21. The optoisolator of claim 18 wherein each of said walls is a photocell.

22. The optoisolator of claim 18 wherein the junction of each pair of adjacent walls is formed by an edge of a first of said pair of adjacent walls abutting said inner surface of a second of said pair of adjacent walls such that said inner surface of said first of said pair of adjacent walls extends outside of said compartment.

23. The optoisolator of claim 18 wherein said light source is at least one light-emitting diode.

24. The optoisolator of claim 18 wherein said compartment is substantially filled with a light-transmissive, non-electrically-conductive material.

25. The optoisolator of claim 18 wherein said compartment has an opening through which said light source electrical contacts extend out of said compartment, and wherein a light-transmissive, non-electrically-conductive material fills said compartment and secures said light source within said compartment.

26. The optoisolator of claim 18 wherein said light source and said enclosure are mounted on a substrate, said substrate providing a floor for said compartment, said floor having an inner surface in said compartment.

27. The optoisolator of claim 26 wherein said floor inner surface includes at least one photosensitive portion illuminated by said light source and that produces an electrical signal when illuminated.