US3699565A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Video generator
Assignee: Hitachi Ltd
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Filing: 1971-05-03
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Granted: 1972-10-17
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Expires: 1991-05-03
Abstract
Abstract A video generator having means for selectively reading out one of many patterns recorded on a first track of a magnetic disc and repeatedly writing this pattern on a second track. The pattern at a desired position on the second track is solely read out to be written on a third track of the magnetic disc, and the video signal thus recorded on the third track is displayed on a CRT display.
Inventors
- 👤 Hiroshi Nagai
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 10:21
CPC Classifications
G; G09; G09G; G09G5/00; G09G5/36; G09G5/39; G09G5/393
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
167 words
A video generator comprising a continuously driven magnetic disc provided with a clock track having clock pulses recorded thereon at equal intervals, a pattern track having various kinds of character patterns recorded thereon at an interval equal to the interval between the clock pulses recorded on said clock track, a transfer track and a display track, display means operating in synchronism with said magnetic disc to read out the character patterns on said display track for successively displaying the characters on a display unit, means for reading out a specific character pattern from said pattern tracks in response to the application of a specific character code to repeatedly write said character pattern on said transfer track at an interval equal to the interval between the clock pulses recorded on said clock track, and means responsive to a display position signal for writing the character pattern occupying the specified position of said transfer track on said display track at the same position with respect to the specific clock.
Claim 2
Dependent Claim
167 words
A video generator comprising a continuously driven magnetic disc provided with a clock track having clock pulses recorded thereon at equal intervals, a pattern track having various kinds of character patterns recorded thereon at an interval equal to the interval between the clock pulses recorded on said clock track, a transfer track and a display track, display means operating in synchronism with said magnetic disc to read out the character patterns on said display track for successively displaying the characters on a display unit, means for reading out a specific character pattern from said pattern tracks in response to the application of a specific character code to repeatedly write said character pattern on said transfer track at an interval equal to the interval between the clock pulses recorded on said clock track, and means responsive to a display position signal for writing the character pattern occupying the specified position of said transfer track on said display track at the same position with respect to the specific clock.
Claim 3
Dependent Claim
43 words
A video generator as claimed in claim 1, in which said magnetic disc is provided with a plurality of display tracks, and a plurality of display units are connected to said display tracks respectively so that said display units can be simultaneously controlled.
Claim 4
Dependent Claim
95 words
A video generator as claimed in claim 1, in which said transfer track is associated with two magnetic heads which are spaced apart by one clock pulse interval of the clock pulses recorded on said clock track, and the head disposed on the trailing side with respect to the direction of rotation of said magnetic disc reads out the character pattern from said transfer track, while the other magnetic head disposed on the leading side writes the character pattern on said transfer track so as to repeatedly write the character pattern on said transfer track.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-10-17 | 1976-04-17 | 1976-10-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-10-17 | 1980-04-17 | 1980-10-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-10-17 | 1984-04-17 | 1984-10-17 | $7700.00 | Window Closed / Lapsed |