Patent ID: 7376299

Claim:
A rotary hinge, comprising: a first hinge part; a second hinge part, wherein said first and second hinge parts, being complimentary, have one common rotation axis and can rotate relative to each other in a predefined angular range or without any angular limitation; at least one sending optical guiding element, permanently attached to one hinge part, the first or the second hinge part, off-axis of said common rotation axis, so said at least one sending optical guiding element can rotate around said common rotation axis, wherein an optical beam comprising said optical signal is directed by the at least one sending optical guiding element substantially towards the common rotation axis; and at least one receiving optical guiding element, permanently attached to a complimentary hinge part of said one hinge part, the second or the first hinge part, respectively, wherein an optical axis of the at least one receiving optical guiding element coincides with the common rotation axis, wherein the optical beam comprising the optical signal is coupled from the at least one sending optical guiding element to the at least one receiving optical guiding element using a predetermined coupling mechanism with substantially the same loss for any angular position of the first and the second hinge parts relative to each other.