Patent US4053808A successfully refreshed from Google Patents.
US4053808A
Expired / Lapsed
US
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Electron beam collimator
Assignee: US Philips Corp
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Filing: 1976-11-12
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Granted: 1977-10-11
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Expires: 1996-11-12
Abstract
Abstract An electron beam collimator formed by two pairs of multi-leaved corner plates connected by slideable members permitting the dimensions of the collimator to be altered.
Inventors
- 👤 Jack Peacock
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 23:03
CPC Classifications
G; G21; G21K; G21K1/00; G21K1/02; H; H01; H01J; H01J21/00; H01J21/02; H01J21/06; H01J21/10; H01J21/14
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
337 words
An electron beam collimator comprising a tube structure of rectangular cross-section and which is defined by first substantially rigid wall members each of which comprises two planar wall portions which meet to form a corner of the tube structure and by further intermediate rigid planar wall members, each side of the tube structure comprising one of the wall portions of one of said first wall members and one of the wall portions of another of said first wall members and at least one intermediate planar wall portion formed by one of the intermediate planar wall members, and each wall portion in each side being arranged in overlapping and sliding relationship with an adjacent wall portion in that side so that the cross-section of the tube structure, and hence of the beam emerging therefrom, can be varied, and means for moving the wall portions relative to one another to vary the cross-section of the tube structure, said means comprising first and second elements which are movable towards and away from one another, and third and fourth elements which are movable towards and away from one another in a direction at right angles to the direction of movement of the first and second elements, one of the first wall members connected to the first and third elements for movement with each of these two elements relative to the other, another of the first wall members being connected to the first and fourth elements for movement with each of these two elements relative to the other, another of the first wall members being connected to the second and third elements for movement with each of these two elements relative to the other, the other of the first wall members being connected to the second and fourth elements for movement with each of these two elements relative to the other, and the intermediate wall member or members in each side of the tube structure being connected to a respective one of the first, second, third and fourth elements for movement therewith.
Claim 2
Dependent Claim
337 words
An electron beam collimator comprising a tube structure of rectangular cross-section and which is defined by first substantially rigid wall members each of which comprises two planar wall portions which meet to form a corner of the tube structure and by further intermediate rigid planar wall members, each side of the tube structure comprising one of the wall portions of one of said first wall members and one of the wall portions of another of said first wall members and at least one intermediate planar wall portion formed by one of the intermediate planar wall members, and each wall portion in each side being arranged in overlapping and sliding relationship with an adjacent wall portion in that side so that the cross-section of the tube structure, and hence of the beam emerging therefrom, can be varied, and means for moving the wall portions relative to one another to vary the cross-section of the tube structure, said means comprising first and second elements which are movable towards and away from one another, and third and fourth elements which are movable towards and away from one another in a direction at right angles to the direction of movement of the first and second elements, one of the first wall members connected to the first and third elements for movement with each of these two elements relative to the other, another of the first wall members being connected to the first and fourth elements for movement with each of these two elements relative to the other, another of the first wall members being connected to the second and third elements for movement with each of these two elements relative to the other, the other of the first wall members being connected to the second and fourth elements for movement with each of these two elements relative to the other, and the intermediate wall member or members in each side of the tube structure being connected to a respective one of the first, second, third and fourth elements for movement therewith.
Claim 3
Dependent Claim
191 words
An electron beam collimator as claimed in claim 1, wherein the first and second elements comprise first and second bars which are arranged parallel to one another and are movable towards and away from one another, and the third and fourth elements comprise third and fourth bars which are arranged parallel to one another and at right angles to the first and second bars and which are also movable towards and away from one another, and wherein four corner pieces are slidably mounted on the bars, one at each of the points where the four bars cross one another, and each corner piece supports a corresponding one of the first wall members of the tube structure, each of the four corner pieces being slidably connected to each of the two bars which cross one another at the location of that corner piece so that the latter can move with either of these bars while sliding along the other, and the intermediate wall member or members in each side of the tube structure being attached to a respective one of the first, second, third and fourth bars between the respective corner pieces.
References Cited (Backward Citations)
US1959756A
Cited
US3942019A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-10-10 | 1981-04-11 | 1981-10-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-10-10 | 1985-04-11 | 1985-10-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-10-10 | 1989-04-11 | 1989-10-11 | $7700.00 | Window Closed / Lapsed |