US3815977A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Photo-detector
Assignee: Individual
•
Filing: 1973-06-08
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Granted: 1974-06-11
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Expires: 1993-06-08
Abstract
Abstract The present invention relates to photo-detectors. The invention resides in that on the photo-sensitive side a photo-detector has a right prism made of an optically transparent material. The two approximately parallel bases of the prism are bounded by a side surface containing an entrance face through which a light beam is admitted, a reflecting face which together with the base and photo-sensitive layer participates in the reflections of the admitted light beam, and at least one additional reflecting face. The edge of the entrance face, which is a side of the base of the right prism, is unparallel to the first reflecting side face.
Inventors
- 👤 G Kufal
- 👤 L Pliev
- 👤 B Glukhovskoi
- 👤 O Golubovsky
- 👤 V Vasiliev
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 19:28
CPC Classifications
H; H01; H01J; H01J40/00; H01J40/02; G; G01; G01J; G01J1/00; G01J1/02; G01J1/04; G01J1/0407; G02; G02B; G02B17/00; G02B17/02; G02B17/04; G02B19/00; G02B19/0004; G02B19/0019; G02B19/0033; G02B19/0076; G02B5/00; G02B5/04; H10; H10F; H10F77/00; H10F77/40; H10F77/407; G01J1/0204; G01J1/0209
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
185 words
A photo-detector comprising a photo-sensitive layer on a substrate; a right prism of an optically transparent material having two approximately parallel bases which are bounded by a side surface and which is mounted on said substrate of the photosensitive layer; said side surface of said prism having an entrance face through which a light beam is admitted, a reflecting face which together with the base and photo-sensitive layer participate in reflecting the admitted light beam, and at least one additional reflecting side face participating together with the first said reflecting side face, base and photosensitive layer in the reflections of the admitted light beam; said entrance face having a surface which is inclined to the bases along the path of the light beam to direct the light beam into the prism at an angle with respect to the parallel bases thereof, the last reflecting side face including means to rotate the light beam incident thereon 180* to return the light beam along its path whereby the light beam travels along said path to undergo successive reflection in the prism and exit from the entrance face.
Claim 2
Dependent Claim
185 words
A photo-detector comprising a photo-sensitive layer on a substrate; a right prism of an optically transparent material having two approximately parallel bases which are bounded by a side surface and which is mounted on said substrate of the photosensitive layer; said side surface of said prism having an entrance face through which a light beam is admitted, a reflecting face which together with the base and photo-sensitive layer participate in reflecting the admitted light beam, and at least one additional reflecting side face participating together with the first said reflecting side face, base and photosensitive layer in the reflections of the admitted light beam; said entrance face having a surface which is inclined to the bases along the path of the light beam to direct the light beam into the prism at an angle with respect to the parallel bases thereof, the last reflecting side face including means to rotate the light beam incident thereon 180* to return the light beam along its path whereby the light beam travels along said path to undergo successive reflection in the prism and exit from the entrance face.
Claim 3
Dependent Claim
27 words
A photo-detector, as in claim 1, in which said right prism is symmetrical about a bisecting plane of the dihedral angle formed by said reflecting side faces.
Claim 4
Dependent Claim
48 words
A photo-detector as in claim 1 in which said means on the last reflecting side face comprises an optical element made of an optically transparent material and which contains a right dihedral reflecting angle formed by faces one of which is parallel to the base of the prism.
Claim 5
Dependent Claim
150 words
A photo-detector, as in claim 1, in which the height h of said right prism is chosen such that, with the substrate of said photo-sensitive layer having a thickness d, the following approximate condition will be satisfied: h about R(1 + cos phi ) tan psi - d where psi angle of incidence of the light beam on the photo-sensitive layer; phi angle between two consecutive planes of propagation of the light beam; R radius of the circle lying in the plane of the lower base of said right prism, the centre of which is at the point of intersection of the plane of the lower base of the right prism, the plane of propagation of the light beam incident on the entrance face, and the plane of the lower base of the prism, while the edges of the entrance and last reflecting side faces are tangent to that circle.
Claim 6
Dependent Claim
146 words
A photo-detector as claimed in claim 2 wherein the height h of said right prism is related to the thickness d of the substrate of said photo-sensitive layer in accordance with the following equation: h R(1 + cos phi ) tan psi - d wherein psi is angle of incidence of the light beam on the photo-sensitive layer; phi is angle between two consecutive planes of propagation of the light beam; and R is the radius of a circle lying the in the plane of the lower base of said right prism, the center of which is at the point of intersection of the plane of the lower base of said prism, said bisecting plane and a plane of propagation of the light beam passing said entrance face, while the edges of said entrance face and said last reflecting side face are tangent to said circle.
References Cited (Backward Citations)
US3415602A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-06-10 | 1977-12-10 | 1978-06-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-06-10 | 1981-12-10 | 1982-06-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-06-10 | 1985-12-10 | 1986-06-11 | $7700.00 | Window Closed / Lapsed |