Patent US4267555A successfully refreshed from Google Patents.
US4267555A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Rotatable raster scan display
Assignee: International Business Machines Corp
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Filing: 1979-06-29
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Granted: 1981-05-12
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Expires: 1999-06-29
Abstract
Abstract Apparatus for rotating a cathode ray tube (CRT) which is operated as a graphic display through 90 degrees such that different size pages of data may be displayed while minimizing the control circuitry required. The display deflection yoke is fixedly attached to a support frame for the display. The CRT is rotatably mounted within the yoke and held by annular thrust bearing which allows the CRT to be rotated 90 degrees. A switch is actuated by the rotation of the CRT to select between sets of control resistors to control the raster scan of the CRT in accordance with its orientation.
Inventors
- 👤 Clay E. Boyd
- 👤 John C. Jones
- 👤 Joanne L. Mumola
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 21:54
CPC Classifications
G; G09; G09G; G09G1/00; G09G1/04; G06; G06F; G06F1/00; G06F1/16; G06F1/1601; G06F2200/00; G06F2200/16; G06F2200/161; G06F2200/1611
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
135 words
In apparatus displaying text material having a format with a longer dimension along a first axis and a shorter dimension along a second axis on a CRT having a longer dimension along one axis and a shorter dimension along the other axis, means for switching the apparatus to display text material having a format with a shorter dimension along said first axis and a longer dimension along said second axis comprising: means for effecting rotation of said CRT substantially 90 degrees with respect to its yoke; means for altering the length of each scan line of said CRT in response to said rotation; and means for altering the length of the sweep of said CRT through successive scan lines in the opposite sense to the alteration in scan line length in response to said rotation.
Claim 2
Dependent Claim
135 words
In apparatus displaying text material having a format with a longer dimension along a first axis and a shorter dimension along a second axis on a CRT having a longer dimension along one axis and a shorter dimension along the other axis, means for switching the apparatus to display text material having a format with a shorter dimension along said first axis and a longer dimension along said second axis comprising: means for effecting rotation of said CRT substantially 90 degrees with respect to its yoke; means for altering the length of each scan line of said CRT in response to said rotation; and means for altering the length of the sweep of said CRT through successive scan lines in the opposite sense to the alteration in scan line length in response to said rotation.
Claim 3
Dependent Claim
31 words
The means for switching of claim 1 wherein said means for effecting rotation includes detent means located substantially 90 degrees apart for inhibiting rotation of said CRT beyond the location thereof.
Claim 4
Dependent Claim
74 words
The means for switching of claim 1 or claim 2 wherein said means for altering the length of each scan line includes switchable means operative in response to the rotation of said CRT to selectively increase or decrease the scan line length, and said means for altering the length of the sweep includes switchable means operative in response to the rotation of said CRT to selectively increase or decrease the number of scan lines.
References Cited (Backward Citations)
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US2428928A
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US2468714A
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GB624025A
Cited
US3676850A
Cited
US4167757A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1984-05-11 | 1984-11-10 | 1985-05-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-05-11 | 1988-11-10 | 1989-05-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-05-11 | 1992-11-10 | 1993-05-12 | $7700.00 | Window Closed / Lapsed |