US3881132A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Compact, high intensity arc lamp with internal magnetic field producing means
Assignee: California Institute of Technology
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Filing: 1973-08-02
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Granted: 1975-04-29
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Expires: 1993-08-02
Abstract
Abstract A significant increase in brightness of the arc and a more focusable light-emitting region are provided in compact arc lamps by causing magnetic lines of force to diverge from the cathode tip from magnetic field producing means disposed within the cathode structure.
Inventors
- 👤 Charles G Miller
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 15:22
CPC Classifications
H; H01; H01J; H01J61/00; H01J61/98; H01J61/02; H01J61/04; H01J61/06; H01J61/073; H01J61/0732; H01J61/10; H01J61/106; H01J61/52; H01J61/523; H01J61/526; H01J2893/00; H01J2893/0063
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
136 words
A high-intensity arc lamp comprising in combination: a sealed envelope for containing a discharge gas at greater than atmospheric pressure; a cathode having a tip extending into the envelope; an anode disposed within said envelope parallel to a line through the axis of the cathode and having a tip spaced an arc discharge gap from the tip of the cathode; electric power means connected to the anode and cathode for forming an arc discharge between said tips including a highly luminous fireball disposed above the cathode tip; and magnetic field producing means disposed internally within said cathode and adjacent the cathode tip for establishing a magnetic field having the maximum possible number of field lines radiating from said cathode tip for said magnetic field for increasing lamp brightness and for improving the shape of said arc.
Claim 2
Dependent Claim
136 words
A high-intensity arc lamp comprising in combination: a sealed envelope for containing a discharge gas at greater than atmospheric pressure; a cathode having a tip extending into the envelope; an anode disposed within said envelope parallel to a line through the axis of the cathode and having a tip spaced an arc discharge gap from the tip of the cathode; electric power means connected to the anode and cathode for forming an arc discharge between said tips including a highly luminous fireball disposed above the cathode tip; and magnetic field producing means disposed internally within said cathode and adjacent the cathode tip for establishing a magnetic field having the maximum possible number of field lines radiating from said cathode tip for said magnetic field for increasing lamp brightness and for improving the shape of said arc.
Claim 3
Dependent Claim
28 words
An arc lamp according to claim 1 in which said magnetic field producing means includes a ferromagnetic pole piece axially disposed within the structure of the cathode tip.
Claim 4
Dependent Claim
31 words
An arc lamp according to claim 2 in which an annular, permanent magnet is supported below the cathode tip for magnetizing the pole piece to develop the longitudinal lines of force.
Claim 5
Dependent Claim
30 words
An arc lamp according to claim 3 in which the pole piece is formed of soft, magnetic iron and the annular magnet is disposed within the structure of the cathode.
Claim 6
Dependent Claim
27 words
An arc lamp according to claim 2 in which said magnetic field producing means includes an electrical winding within said cathode and means for energizing said winding.
Claim 7
Dependent Claim
24 words
An arc lamp according to claim 1 in which said cathode is hollow and further includes means for flowing coolant through the hollow cathode.
Claim 8
Dependent Claim
44 words
An arc lamp according to claim 6 wherein said hollow cathode includes a soft iron inlet tube for flowing coolant through said cathode, and said magnetic field producing means includes an electrical winding wound around said inlet tube, and means for energizing said winding.
Claim 9
Dependent Claim
47 words
An arc lamp according to claim 6 wherein said hollow cathode includes a soft iron inlet tube for flowing coolant through said cathode, and said magnetic field producing means includes an annular magnet disposed within the structure of said cathode and enclosing said soft iron inlet tube.
Claim 10
Dependent Claim
105 words
A high-intensity arc lamp comprising in combination: a sealed envelope for containing a discharge gas at greater than atmospheric pressure; a cathode having a tip extending into the envelope; an anode disposed within said envelope parallel to a line through the axis of the cathode and having a tip spaced an arc discharge gap from the tip of the cathode; electric power means connected to the anode and cathode for forming an arc discharge between said tips including a highly luminous fireball disposed above the cathode tip; and a magnet positioned within said cathode, said cathode having a magnetic pole piece adjacent said cathode tip.
Claim 11
Dependent Claim
105 words
A high-intensity arc lamp comprising in combination: a sealed envelope for containing a discharge gas at greater than atmospheric pressure; a cathode having a tip extending into the envelope; an anode disposed within said envelope parallel to a line through the axis of the cathode and having a tip spaced an arc discharge gap from the tip of the cathode; electric power means connected to the anode and cathode for forming an arc discharge between said tips including a highly luminous fireball disposed above the cathode tip; and a magnet positioned within said cathode, said cathode having a magnetic pole piece adjacent said cathode tip.
Claim 12
Dependent Claim
94 words
In an arc lamp of the type comprising a cathode having a tip and an anode spaced therefrom enclosed in a gas filled envelope which upon the application of voltage between anode and cathode produces a fireball adjacent the cathode, a method of increasing the lamp brightness output and improving the shape of the light emitting region thereof comprising: generating a magnetic field from within and adjacent the tip of the cathode of said arc lamp to cause a maximum possible number of field lines to radiate from said cathode for said magnetic field.
Claim 13
Dependent Claim
94 words
In an arc lamp of the type comprising a cathode having a tip and an anode spaced therefrom enclosed in a gas filled envelope which upon the application of voltage between anode and cathode produces a fireball adjacent the cathode, a method of increasing the lamp brightness output and improving the shape of the light emitting region thereof comprising: generating a magnetic field from within and adjacent the tip of the cathode of said arc lamp to cause a maximum possible number of field lines to radiate from said cathode for said magnetic field.
Claim 14
Dependent Claim
43 words
A method as called for in claim 10 wherein said step of generating a magnetic field from within and adjacent the tip of said cathode comprises: placing an elongated magnet within said cathode and below the tip thereof to provide a magnetic field.
Claim 15
Dependent Claim
54 words
A method as called for in claim 10 wherein said step of generating a magnetic field from within and adjacent the tip of said cathode comprises: placing a soft iron pole piece within the tip of said cathode; and placing annular magnet around the periphery of said cathode and adjacent to the tip thereof.
References Cited (Backward Citations)
US3082307A
Cited
US3113234A
Cited
US3311769A
Cited
US3408526A
Cited
US3378713A
Cited
US3384772A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-04-28 | 1978-10-28 | 1979-04-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-04-28 | 1982-10-28 | 1983-04-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-04-28 | 1986-10-28 | 1987-04-29 | $7700.00 | Window Closed / Lapsed |