US3873829A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Photo cathode with means provided which produce a repeated total reflection of the incident light without interference phenomena
Assignee: US Philips Corp
•
Filing: 1973-11-30
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Granted: 1975-03-25
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Expires: 1993-11-30
Abstract
Abstract Device comprising a photoelectrically sensitive layer, in particular a photo cathode, which is supported by a transparent plane-parallel support through which the light is incident and on which means are provided which produce a repeated total reflection of the incident light without interference phenomena.
Inventors
- 👤 Robert Evrard
- 👤 Daniel Louis Poulain
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 13:15
CPC Classifications
H; H01; H01J; H01J40/00; H01J40/02; H01J40/04; H01J40/06; H01J29/00; H01J29/02; H01J29/10; H01J29/36; H01J29/38
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
164 words
A photoelectric device, comprising a transparent plane parallel support, a photocathode in the form of a layer on one side of the support, and a plurality of adjoining prisms arranged on the side of the support remote from the photocathode layer, each prism containing at least one end surface substantially parallel to the photoconductor layer, the generatrices of all the prisms being mutually parallel and parallel to the photocathode layer, the prisms each having totally reflective side faces adjoining the end faces and making an angle greater than zero with aid surface of the support, the prisms each having at least one transparent entrance face spaced from said one end surface for admitting radiation into the prism and for internally reflecting radiation reflected onto the entrance face from the totally reflecting side faces and from said one end face, the angles of the side faces being sufficient to produce multiple internal reflections within the device and thereby substantially eliminate retroreflection of the impinging radiation.
Claim 2
Dependent Claim
164 words
A photoelectric device, comprising a transparent plane parallel support, a photocathode in the form of a layer on one side of the support, and a plurality of adjoining prisms arranged on the side of the support remote from the photocathode layer, each prism containing at least one end surface substantially parallel to the photoconductor layer, the generatrices of all the prisms being mutually parallel and parallel to the photocathode layer, the prisms each having totally reflective side faces adjoining the end faces and making an angle greater than zero with aid surface of the support, the prisms each having at least one transparent entrance face spaced from said one end surface for admitting radiation into the prism and for internally reflecting radiation reflected onto the entrance face from the totally reflecting side faces and from said one end face, the angles of the side faces being sufficient to produce multiple internal reflections within the device and thereby substantially eliminate retroreflection of the impinging radiation.
Claim 3
Dependent Claim
77 words
A device as claimed in claim 1 characterized in that the transparent bodies which adjoin each other have a plane parallelogram as a cross-section, the transparent bodies comprising means for totally reflecting light perpendicularly incident on the front face from the side face to the front face, and for totally reflecting light from the front face to the sensitive layer, the front face being substantially equal to the projection of the side face on the front face.
Claim 4
Dependent Claim
74 words
A device as claimed in claim 1, characterized in that the transparent bodies have an asymmetrical pentagonal cross-section and have a short side against the plane-parallel support, two sides, which enclose an obtuse angle with said short side are reflecting, and he two remaining sides enclose an obtuse angle with each other and are directed towards the incident light, the whole cross-section being symmetrical relative to the short side touching the plane parallel support.
Claim 5
Dependent Claim
57 words
A device as claimed in claim 1, characterized in that the prismatic bodies have A cross-section corresponding to an isosceles trapezium the top of which touches the plane-parallel support and the upright sides of which are reflecting, a triangular recess present symmetrically relatively to the trapezium being formed from the base in the plane of the trapezium.
Claim 6
Dependent Claim
34 words
A device as claimed in claim 3, characterized in that the space between the prismatic bodies and the support is occupied by reflecting members which accurately adjoin the side faces of the prismatic bodies.
References Cited (Backward Citations)
US3258590A
Cited
US2837006A
Cited
US2892096A
Cited
US3043976A
Cited
US3551841A
Cited
US3700947A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-03-24 | 1978-09-23 | 1979-03-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-03-24 | 1982-09-23 | 1983-03-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-03-24 | 1986-09-23 | 1987-03-25 | $7700.00 | Window Closed / Lapsed |