US2128103A - Self generating phototube - Google Patents
Self generating phototube Download PDFInfo
- Publication number
- US2128103A US2128103A US138691A US13869137A US2128103A US 2128103 A US2128103 A US 2128103A US 138691 A US138691 A US 138691A US 13869137 A US13869137 A US 13869137A US 2128103 A US2128103 A US 2128103A
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- United States
- Prior art keywords
- anode
- cathode
- phototube
- electrons
- photo
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- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
- H01J40/00—Photoelectric discharge tubes not involving the ionisation of a gas
- H01J40/16—Photoelectric discharge tubes not involving the ionisation of a gas having photo- emissive cathode, e.g. alkaline photoelectric cell
Definitions
- This invention relates to phototubes and is a division from my application, Serial No. 79,420, filed May 13, 1936.
- An object is to provide a phototube which will 5 generate its own operating potential difference rather than using a battery for this purpose.
- This effect may be achieved by employing two photo-emissive elements and deflecting electrons from one element by means of a magnetic field, or by illuminating the two elements with light of different intensity, or by employing elements of different size or design. 7
- Such a device will be useful in generating electricity directly from light, such as sun light, or it may be used in place of the ordinary photoelectric tube.
- the figure is an elevation, in part section, of a phototube employing two photo-emissive elements, a magnetic field, and a grounded element.
- phototube l the envelope of which may be made of glass or other transparentmaterial and which may be highly evacuated or gaseous as desired has photo-emissive cathode 2 and photo-emissive anode 3.
- Metal plate 4 is placed in tube l near anode 3 and is grounded as shown.
- Magnetic field 6, shown endwise is provided by magnet 9, shown broken away, so that any electrons ejected from anode 3 will be bent downward to strike ground-ed plate 4 and electrons ejected from cathode 2, travelling in opposite direction, will be bent upward to strike anode 3.
- Anode 3 may also be illuminated more strongly than cathode 2 to enhance further its positive potential with respect to cathode 2. It will'be seen then that electrons leaving cathode 2 will strike anode 3 but electrons leaving anode 3 will not strike cathode 2. The result will be that a current will flow in the outside circuit 8, 5, 1, without an anode battery, element 5 being a suitable instrument.
- the current generated can be reversed by reversing the relative intensity of illumination of the two elements.
- Such a device could of course be used for comparing light intensities.
- a phototube comprising a photo-sensitive cathode, a photo-sensitive anode, an electron receiving element intermediate said cathode and anode, and means for creating a magnetic field perpendicular to a plane passing through said cathode, anode, and element to direct electrons from said anode upon said element and to assist in directing electrons from said cathode away from said element and onto said anode.
- a phototube comprising, a photo-sensitive cathode, a photo-sensitive anode, an electron re DCving element intermediate said cathode and anode, and means for creating a magnetic field directed across the normal electron path between said cathode and anode.
Description
1938. A. G. THGMAS 2,128,103
SELF GENERATING PHOTOTUBE Original Filed May 15, 1936 Inventor Patented Aug. 23, 1938 PATENT OFFICE SELF GENERATING PHO'TOTUBE Albert G. Thom as, Lynchburg, Va.
Original application May 13, 1936, 5 Serial No.
79,420. Divided and this application April 24,
1937, Serial N0. 138,691
2 Claims.
This invention relates to phototubes and is a division from my application, Serial No. 79,420, filed May 13, 1936.
An object is to provide a phototube which will 5 generate its own operating potential difference rather than using a battery for this purpose. This effect may be achieved by employing two photo-emissive elements and deflecting electrons from one element by means of a magnetic field, or by illuminating the two elements with light of different intensity, or by employing elements of different size or design. 7
Such a device will be useful in generating electricity directly from light, such as sun light, or it may be used in place of the ordinary photoelectric tube.
In the drawing:
The figure is an elevation, in part section, of a phototube employing two photo-emissive elements, a magnetic field, and a grounded element.
In the figure phototube l the envelope of which may be made of glass or other transparentmaterial and which may be highly evacuated or gaseous as desired has photo-emissive cathode 2 and photo-emissive anode 3. Metal plate 4 is placed in tube l near anode 3 and is grounded as shown. Magnetic field 6, shown endwise is provided by magnet 9, shown broken away, so that any electrons ejected from anode 3 will be bent downward to strike ground-ed plate 4 and electrons ejected from cathode 2, travelling in opposite direction, will be bent upward to strike anode 3. The curvature of cathode 2 may also be arranged so that the electrons which are emitted normally to the surface, will strike anode 3 and this anode may be similarly curved so that electrons ejected from it will strike plate 4. In either case the electrons from anode 3 will strike grounded plate 4 and will be neutralized or removed from tube I so that anode 3 will be left positively charged so that electrons from cathode 2 will be attracted to anode 3 with the result that a current will be indicated by instrument 5 connected to wires 1 and 8 leading to cathode 2 and anode 3 respectively.
In case a difference in the intensity of illumination of the two photo-emissive elements is employed, the current generated can be reversed by reversing the relative intensity of illumination of the two elements. Such a device could of course be used for comparing light intensities.
What I claim is:
1. A phototube comprising a photo-sensitive cathode, a photo-sensitive anode, an electron receiving element intermediate said cathode and anode, and means for creating a magnetic field perpendicular to a plane passing through said cathode, anode, and element to direct electrons from said anode upon said element and to assist in directing electrons from said cathode away from said element and onto said anode.
2. A phototube comprising, a photo-sensitive cathode, a photo-sensitive anode, an electron re ceiving element intermediate said cathode and anode, and means for creating a magnetic field directed across the normal electron path between said cathode and anode.
ALBERT G. THOMAS.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US138691A US2128103A (en) | 1936-05-13 | 1937-04-24 | Self generating phototube |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US79420A US2102045A (en) | 1936-05-13 | 1936-05-13 | Electron discharge tube |
US138691A US2128103A (en) | 1936-05-13 | 1937-04-24 | Self generating phototube |
Publications (1)
Publication Number | Publication Date |
---|---|
US2128103A true US2128103A (en) | 1938-08-23 |
Family
ID=26761982
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US138691A Expired - Lifetime US2128103A (en) | 1936-05-13 | 1937-04-24 | Self generating phototube |
Country Status (1)
Country | Link |
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US (1) | US2128103A (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2760483A (en) * | 1953-10-29 | 1956-08-28 | Tassicker Graham Edward | Retinal stimulator |
US3058022A (en) * | 1959-04-14 | 1962-10-09 | Radiation Res Corp | Photoelectric generator |
-
1937
- 1937-04-24 US US138691A patent/US2128103A/en not_active Expired - Lifetime
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2760483A (en) * | 1953-10-29 | 1956-08-28 | Tassicker Graham Edward | Retinal stimulator |
US3058022A (en) * | 1959-04-14 | 1962-10-09 | Radiation Res Corp | Photoelectric generator |
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