US5221987A
Expired / Lapsed
US
⏱️ 0.0 years remaining
FTIR modulator
Assignee: Optical Switch Corp
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Filing: 1992-04-10
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Granted: 1993-06-22
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Expires: 2012-04-10
Abstract
Abstract A modulating device based on the principal of frustrated total internal reflection that functions over a wide range of angles and wave lengths. The modulator is comprised of two refractive elements that initially are in contact. The edges of the elements are forced apart by a piezo electric transducer and the elasticity of the second refracting element lifts the center of that element away from the first refracting element. The amount of reflection at the interface of the two refractive elements is a function of their spacing. This reflection is reduced to zero by the addition of a thin plastic layer on the surface of one of the refracting elements which allows total contact across the entire surface of the two refractive elements.
Inventors
- 👤 Richard H. Laughlin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 10:37
CPC Classifications
G; G02; G02B; G02B26/00; G02B26/02; G02B5/00; G02B5/12; G02B5/122
Claims Analysis
Total Claims: 27
Claim 1
Independent Claim
187 words
A device for modulating the intensity of an optical beam comprising: a first transparent refracting element having first and second surfaces and having an index of refraction greater than one, said second surface thereof being substantially flat; a second transparent refracting element having first and second opposed surfaces and having an index of refraction substantially equal to or greater than the index of refraction of said first transparent refracting element, said first surface thereof being substantially flat and being disposed adjacent said second surface of said first transparent refracting element; an electrically actuated transducer means mounted adjacent said first and second transparent refracting elements, for separating said first and second transparent refracting elements by a variable and controlled amount when said transducer means is actuated; and return means disposed adjacent said second surface of said second transparent refracting element for providing a force to return said first surface of said second transparent refracting element into substantial contact with said second surface of said first transparent refracting element when said transducer is deactivated by causing said second transparent refracting element to move toward said first transparent reinforcing element.
Claim 2
Independent Claim
187 words
A device for modulating the intensity of an optical beam comprising: a first transparent refracting element having first and second surfaces and having an index of refraction greater than one, said second surface thereof being substantially flat; a second transparent refracting element having first and second opposed surfaces and having an index of refraction substantially equal to or greater than the index of refraction of said first transparent refracting element, said first surface thereof being substantially flat and being disposed adjacent said second surface of said first transparent refracting element; an electrically actuated transducer means mounted adjacent said first and second transparent refracting elements, for separating said first and second transparent refracting elements by a variable and controlled amount when said transducer means is actuated; and return means disposed adjacent said second surface of said second transparent refracting element for providing a force to return said first surface of said second transparent refracting element into substantial contact with said second surface of said first transparent refracting element when said transducer is deactivated by causing said second transparent refracting element to move toward said first transparent reinforcing element.
Claim 3
Dependent Claim
12 words
The device of claim 1 wherein said return means includes a spring.
Claim 4
Dependent Claim
12 words
The device of claim 1 wherein said return means includes a transducer.
Claim 5
Dependent Claim
21 words
The device of claim 1 wherein the second surface of said second transparent refracting element includes means for absorbing optical energy.
Claim 6
Dependent Claim
28 words
The device of claim 1 wherein said second surface of said second transparent refracting element is not parallel to said first surface of said second transparent refracting element.
Claim 7
Dependent Claim
13 words
The device of claim 1 wherein said transducer means includes a piezo-electric material.
Claim 8
Dependent Claim
25 words
The device of claim 1 and further including a prism and said first surface of said first transparent refracting element being attached to said prism.
Claim 9
Dependent Claim
12 words
The device of claim 7 wherein said prism is a corner cube.
Claim 10
Dependent Claim
13 words
The device of claim 7 wherein said prism is a right angle prism.
Claim 11
Dependent Claim
14 words
The device of claim 1 wherein said first transparent refracting element includes a prism.
Claim 12
Dependent Claim
12 words
The device of claim 10 wherein said prism is a corner cube.
Claim 13
Dependent Claim
13 words
The device of claim 10 wherein said prism is a right angle prism.
Claim 14
Dependent Claim
24 words
The device of claim 1 and further including a layer of plastic material disposed on said second surface of said first transparent refracting surface.
Claim 15
Dependent Claim
24 words
The device of claim 1 and further including a layer of plastic material disposed on said first surface of said second transparent refracting surface.
Claim 16
Dependent Claim
23 words
The device of claim 1 and further including an elastic plate, and said second transparent refracting element being attached to said elastic plate.
Claim 17
Dependent Claim
15 words
The device of claim 1 wherein said second transparent refracting element comprises an elastic material.
Claim 18
Independent Claim
260 words
A device for modulating the intensity of an optical beam comprising: a first transparent refracting element having first and second surfaces, opposed edges, and having an index of refraction greater than one, said second surface thereof being substantially flat; a second transparent refracting element having first and second opposed surfaces, opposed edges, and having an index of refraction substantially equal to or greater than the index of refraction of said first transparent refracting element, said first surface thereof being substantially flat and being disposed adjacent said second surface of said first transparent refracting element; an electrically actuated transducer means mounted adjacent said opposed edges of said first and second transparent refracting elements, for separating said opposed edges of said first and second transparent refracting elements by a variable and controlled amount when said transducer means is actuated; and return means disposed adjacent said second surface of said second transparent refracting element and disposed between said opposed edges of said second transparent refracting element for providing a force to return said first surface of said second transparent refracting element into substantial contact with said second surface of said first transparent refracting element when said transducer is deactivated, said return means causing deflection of said first surface of said second transparent refracting element centrally between said opposed edges thereof, such that said first surface of said second transparent refracting element initially contacts said second surface of said first transparent refracting element between said opposed edges thereof prior to said opposed edges of said first and second transparent refracting elements contacting each other.
Claim 19
Independent Claim
260 words
A device for modulating the intensity of an optical beam comprising: a first transparent refracting element having first and second surfaces, opposed edges, and having an index of refraction greater than one, said second surface thereof being substantially flat; a second transparent refracting element having first and second opposed surfaces, opposed edges, and having an index of refraction substantially equal to or greater than the index of refraction of said first transparent refracting element, said first surface thereof being substantially flat and being disposed adjacent said second surface of said first transparent refracting element; an electrically actuated transducer means mounted adjacent said opposed edges of said first and second transparent refracting elements, for separating said opposed edges of said first and second transparent refracting elements by a variable and controlled amount when said transducer means is actuated; and return means disposed adjacent said second surface of said second transparent refracting element and disposed between said opposed edges of said second transparent refracting element for providing a force to return said first surface of said second transparent refracting element into substantial contact with said second surface of said first transparent refracting element when said transducer is deactivated, said return means causing deflection of said first surface of said second transparent refracting element centrally between said opposed edges thereof, such that said first surface of said second transparent refracting element initially contacts said second surface of said first transparent refracting element between said opposed edges thereof prior to said opposed edges of said first and second transparent refracting elements contacting each other.
Claim 20
Dependent Claim
12 words
The device of claim 17 wherein said return means includes a spring.
Claim 21
Dependent Claim
12 words
The device of claim 17 wherein said return means includes a transducer.
Claim 22
Dependent Claim
24 words
The device of claim 17 and further including a layer of plastic material disposed on said second surface of said first transparent refracting surface.
Claim 23
Dependent Claim
24 words
The device of claim 17 and further including a layer of plastic material disposed on said first surface of said second transparent refracting surface.
Claim 24
Dependent Claim
23 words
The device of claim 17 and further including an elastic plate, and said second transparent refracting element being attached to said elastic plate.
Claim 25
Dependent Claim
15 words
The device of claim 17 wherein said second transparent refracting element comprises an elastic material.
Claim 26
Independent Claim
231 words
A device for modulating the intensity of an optical beam comprising: a first transparent refracting element having first and second surfaces, opposed edges, and having an index of refraction greater than one, said second surface thereof being substantially flat; a second transparent refracting element having first and second opposed surfaces, opposed edges, and having an index of refraction substantially equal to or greater than the index of refraction of said first transparent refracting element, said first surface thereof being substantially flat and being disposed adjacent said second surface of said first transparent refracting element; means mounted adjacent said first and second transparent refracting elements, for separating said first and second transparent refracting elements; and return means disposed adjacent said second surface of said second transparent refracting element and disposed between said opposed edges of said second transparent refracting element for providing a force to return said first surface of said second transparent refracting element into substantial contact with said second surface of said first transparent refracting element, said return means causing deflection of said first surface of said second transparent refracting element centrally between said opposed edges thereof, such that said first surface of said second transparent refracting element initially contacts said second surface of said first transparent refracting element between said opposed edges thereof prior to said opposed edges of said first and second transparent refracting elements contacting each other.
Claim 27
Independent Claim
231 words
A device for modulating the intensity of an optical beam comprising: a first transparent refracting element having first and second surfaces, opposed edges, and having an index of refraction greater than one, said second surface thereof being substantially flat; a second transparent refracting element having first and second opposed surfaces, opposed edges, and having an index of refraction substantially equal to or greater than the index of refraction of said first transparent refracting element, said first surface thereof being substantially flat and being disposed adjacent said second surface of said first transparent refracting element; means mounted adjacent said first and second transparent refracting elements, for separating said first and second transparent refracting elements; and return means disposed adjacent said second surface of said second transparent refracting element and disposed between said opposed edges of said second transparent refracting element for providing a force to return said first surface of said second transparent refracting element into substantial contact with said second surface of said first transparent refracting element, said return means causing deflection of said first surface of said second transparent refracting element centrally between said opposed edges thereof, such that said first surface of said second transparent refracting element initially contacts said second surface of said first transparent refracting element between said opposed edges thereof prior to said opposed edges of said first and second transparent refracting elements contacting each other.
References Cited (Backward Citations)
US2565514A
Cited
US2997922A
Cited
US3338656A
Cited
US3559101A
Cited
US3376092A
Cited
US3514183A
Cited
US3649105A
Cited
US4165155A
Cited
US4249814A
Cited
US4796263A
Cited
US4361911A
Cited
US4613203A
Cited
US4714326A
Cited
US4738500A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1996-06-21 | 1996-12-21 | 1997-06-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2000-06-21 | 2000-12-21 | 2001-06-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2004-06-21 | 2004-12-21 | 2005-06-22 | $7700.00 | Window Closed / Lapsed |