Optical data connector having magnetic interconnect sensor

• US 4,903,340 A
• Filed: 03/23/1988
• Issued: 02/20/1990
• Est. Priority Date: 03/23/1988
• Status: Expired due to Fees

• Current Assignee: Spacelabs, Inc. (OSI Systems Incorporated)
• Original Assignee: Spacelabs, Inc. (OSI Systems Incorporated)
• Inventors: Sorensen, Jay R.
• Primary Examiner(s): Safourek, Benedict V.
• Assistant Examiner(s): Van Beek, Leslie
• Application Number:
  US07/172,326
• Time in Patent Office: 699 Days
• Field of Search: 455/601, 455/603, 455/606, 455/607, 455/608, 455/609, 455/613, 455/612, 455/617, 455/618, 455/619, 350/96.15, 350/96.16, 350/96.2, 350/96.21, 350/96.22
• US Class Current: 398/117
• CPC Class Codes: G02B 6/4295 coupling with semiconductor devices activated by light through the light guide, e.g. thyristors, phototransistors
• CPC Class Codes: H04B 10/801 using optical interconnects, e.g. light coupled isolators, circuit board interconnections

Abstract

An optical data link for transferring data between a pair of connectors and for activating an electrical device to which one of the connectors is attached. A light-emitting diode (LED) and a phototransistor are mounted in each of the connectors, with the LED of each connector visible to the phototransistor of the other connector when the connectors engage each other. The LEDs and phototransistors are connected to respective interface circuits. The interface circuits for at least one of the LEDs limits the current through the LED regardless of the amplitude of a driving signal. The interface circuits for the phototransistors maintain a relatively constant voltage across the phototransistors so that the phototransistors function as current switches. The electrical device is activated in response to closure of a magnetically sensitive reed switch mounted in the connector attached to the electrical device. The switch is closed when the connectors engage each other by the magnetic field generated by a magnet mounted in the other connector.

Claims

1. An optical data link for transferring data from a first connector to a second connector while actuating an electrical device connected to said second connector when said first and second connectors engage each other, said data link comprising:

a magnet mounted in said first connector;

a first optical communication component mounted in said first connector;

a magnetically sensitive switch mounted in said second connector so that, when said first and second connectors engage each other, the magnetic field from said magnet closes said switch, said switch being connected to said electrical device to activate said electrical device when said switch is closed; and

a second optical communication component mounted in said second connector at a position where it is visible to said first optical component when said first and second connectors engage each other, said second optical communication component being electrically connected to said electrical device, one of said optical communication components emitting light as a function of a binary data signal and the other of said optical communication components detecting light emitted by said optical communication component to recover said binary data signal whereby said data signal is transferred between said first connector and said electrical device.

2. The optical data link of claim 1 wherein said light is emitted by said first optical communication component and said light is detected by said second optical communication component whereby data is transferred from said first connector to said electrical device.

3. The optical data link of claim 2, further including a second light-emitting optical communication component mounted in said second connector and a second light detecting optical communication component mounted in said first connector to provide bidirectional data transfer to and from said electrical device.

4. The optical data link of claim 1 wherein said light is emitted by said second optical communication component and said light is detected by said first optical communication component whereby data is transferred to said first connector from said electrical device.

5. The optical data link of claim 1 wherein said second connector is mounted directly on said electrical device.

6. The optical data link of claim 1 wherein said light detecting optical component is a phototransistor.

7. The optical data link of claim 6, further including an interface circuit connected to said phototransistor, said interface circuit including means for maintaining a substantially constant voltage across said phototransistor to allow said phototransistor to function as a current switch.

8. The optical data link of claim 1 wherein said light-emitting optical component is a light-emitting diode.

9. The optical data link of claim 8, further including an interface circuit connected to said light-emitting diode, said interface circuit including means for limiting the current flow through said light-emitting diode when said binary data signal is applied to said light-emitting diode through said interface circuit.

10. An optical data link for transferring data between first and second connectors and for generating an actuating signal when said connectors are interconnected, said data link comprising:

a magnet mounted in said first connector;

a first optical communication component mounted in said first connector;

a magnetically sensitive switch mounted in said second connector so that, when said first and second connectors are interconnected, the magnetic field from said magnet closes said switch, said switch generating said actuating signal when said switch is closed; and

a second optical communication component mounted in said second connector at a position where it is visible to said first optical component when said first and second connectors are interconnected, one of said optical communication components emitting light as a function of a binary data signal and the other of said optical communication components detecting light emitted by said optical communication component to recover said binary data signal.

11. The optical data link of claim 10 wherein said light is emitted by said first optical communication component and said light is detected by said second optical communication component whereby data is transferred from said first connector to said second connector.

12. The optical data link of claim 11, further including a second light-emitting optical communication component mounted in said second connector and a second light detecting optical communication component mounted in said first connector to provide bidirectional data transfer between said electrical connectors.

13. The optical data link of claim 10 wherein said light is emitted by said second optical communication component and said light is detected by said first optical communication component whereby data is transferred to said first connector from said second connector.

14. The optical data link of claim 10 wherein said light detecting optical component is a phototransistor.

15. The optical data link of claim 14, further including an interface circuit connected to said phototransistor, said interface circuit including means for maintaining a substantially constant voltage across said phototransistor to allow said phototransistor to function as a current switch.

16. The optical data link of claim 10 wherein said light-emitting optical component is a light-emitting diode.

17. The optical data link of claim 16, further including an interface circuit connected to said light-emitting diode, said interface circuit including means for limiting the current flow through said light-emitting diode when said binary data signal is applied to said light-emitting diode through said interface circuit.

18. A method of transferring digital data between first and second connectors and indicating when said first and second connectors are interconnected, said method comprising:

transmitting light from one of said connectors in accordance with said digital data;

detecting said light at the other of said connectors;

generating a magnetic field from said first connector; and

detecting said magnetic field at said second connector, thereby providing an indication that said first and second connectors are interconnected.

19. The method of claim 18 wherein said magnetic field is detected by mounting a magnetically sensitive reed switch in said second connector.

20. The method of claim 18 wherein said light is transmitted from a light-emitting diode mounted in one of said connectors.

21. The method of claim 18 wherein said light is detected by a phototransistor mounted in one of said connectors.