US4438366A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Cathode-ray tube driving apparatus
Assignee: Hitachi Ltd
•
Filing: 1981-07-22
•
Granted: 1984-03-20
•
Expires: 2001-07-22
Abstract
Abstract An improved apparatus for driving a cathode-ray tube (CRT) with minimized power consumption is disclosed. In the apparatus, a voltage regulator element (a Zener diode) supplying a regulated voltage substantially equal to that voltage of the associated cathode providing a maximum image luminance is connected in series with the cathode between the driving circuit and the cathode, thereby reducing the driving voltage of the driving power source and reducing the power consumption of the CRT driving apparatus.
Inventors
- 👤 Yasuji Kamata
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 17:29
CPC Classifications
H; H04; H04N; H04N5/00; H04N5/66; H04N5/68
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
87 words
In an apparatus for driving a cathode-ray tube which includes at least one cathode, a grid associated with said cathode, and an anode, and a power supply connected to said cathode, grid and anode, the improvement comprising voltage regulating means connected to said power supply in series with said cathode for supplying a regulated voltage of predetermined value approximately equal to the voltage of said cathode which produces a predetermined high value of image luminance in said cathode ray tube, whereby the cathode driving voltage is reduced.
Claim 2
Dependent Claim
87 words
In an apparatus for driving a cathode-ray tube which includes at least one cathode, a grid associated with said cathode, and an anode, and a power supply connected to said cathode, grid and anode, the improvement comprising voltage regulating means connected to said power supply in series with said cathode for supplying a regulated voltage of predetermined value approximately equal to the voltage of said cathode which produces a predetermined high value of image luminance in said cathode ray tube, whereby the cathode driving voltage is reduced.
Claim 3
Dependent Claim
31 words
A CRT driving apparatus as claimed in claim 1, wherein said voltage regulating means is mounted on a printed circuit board which includes a socket for the cathode of the CRT.
Claim 4
Dependent Claim
20 words
A CRT driving apparatus as claimed in claim 1 or 2, wherein said voltage regulating means includes a Zener diode.
Claim 5
Dependent Claim
30 words
A CRT driving apparatus as claimed in claim 1 or 2, wherein said voltage regulating means includes a Zener diode and a capacitor connected in parallel with said Zener diode.
Claim 6
Dependent Claim
61 words
A CRT driving apparatus as claimed in claim 1, wherein said voltage regulating means includes a plurality of series connected voltage regulator elements arranged to be short-circuited thereacross by a conductor so that said short-circuiting conductor can be partly or wholly cut off depending on the value of said regulated voltage of predetermined value to thereby provide a required regulated voltage.
Claim 7
Dependent Claim
75 words
A CRT driving apparatus as claimed in claim 1, wherein said voltage regulating means includes a plurality of series connected voltage regulator elements mounted on a printed circuit board and arranged to be short-circuited thereacross by a conductor printed on said printed circuit board so that said short-circuiting printed conductor can be partly or wholly cut off depending on the value of said regulated voltage of predetermined value to thereby provide a required regulated voltage.
Claim 8
Dependent Claim
22 words
A CRT driving apparatus as claimed in claim 5 or 6, wherein each of said voltage regulator elements is a Zener diode.
Claim 9
Dependent Claim
32 words
A CRT driving apparatus as claimed in claim 5 or 6, wherein each of said voltage regulator elements includes a Zener diode and a capacitor connected in parallel with said Zener diode.
Claim 10
Independent Claim
119 words
An apparatus for driving a cathode-ray tube including at least one cathode, a grid associated with said cathode and an anode, the apparatus comprising a cathode drive power source, means connected to said power source for controlling a cathode drive voltage to be applied to said cathode for displaying images with various luminances, and voltage regulating means connected in series between said cathode drive power source and said cathode for producing a voltage thereacross having the same polarity as that of the voltage of said cathode drive power source in the series connection and having an amplitude substantially equal to that cathode drive voltage which will provide a predetermined high level of image luminance in said cathode ray tube.
Claim 11
Independent Claim
119 words
An apparatus for driving a cathode-ray tube including at least one cathode, a grid associated with said cathode and an anode, the apparatus comprising a cathode drive power source, means connected to said power source for controlling a cathode drive voltage to be applied to said cathode for displaying images with various luminances, and voltage regulating means connected in series between said cathode drive power source and said cathode for producing a voltage thereacross having the same polarity as that of the voltage of said cathode drive power source in the series connection and having an amplitude substantially equal to that cathode drive voltage which will provide a predetermined high level of image luminance in said cathode ray tube.
Claim 12
Dependent Claim
18 words
A CRT driving apparatus as claimed in claim 9, wherein said voltage regulating means includes a Zener diode.
Claim 13
Dependent Claim
28 words
A CRT driving apparatus as claimed in claim 9, wherein said voltage regulating means includes a Zener diode and a capacitor connected in parallel with said Zener diode.
Claim 14
Dependent Claim
68 words
A CRT driving apparatus as claimed in claim 9, wherein said voltage regulating means includes a plurality of series connected voltage regulator elements arranged to be short-circuited thereacross by a conductor so that said short-circuiting conductor can be partly or wholly cut off depending on the value of the cathode drive voltage which provides said predetermined high level of image luminance to thereby provide a required regulated voltage.
Claim 15
Dependent Claim
82 words
A CRT driving apparatus as claimed in claim 9, wherein said voltage regulating means includes a plurality of series connected voltage regulator elements mounted on a printed circuit board and arranged to be short-circuited thereacross by a conductor printed on said printed circuit board so that said short-circuiting printed conductor can be partly or wholly cut off depending on the value of the cathode drive voltage which provides said predetermined high level of image luminance to thereby provide a required regulated voltage.
Claim 16
Dependent Claim
20 words
A CRT driving apparatus as claimed in claim 13, wherein each of said voltage regulator elements is a Zener diode.
Claim 17
Dependent Claim
30 words
A CRT driving apparatus as claimed in claim 13, wherein each of said voltage regulator elements includes a Zener diode and a capacitor connected in parallel with said Zener diode.
References Cited (Backward Citations)
US2465406A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1987-03-20 | 1987-09-19 | 1988-03-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-03-20 | 1991-09-19 | 1992-03-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-03-20 | 1995-09-19 | 1996-03-20 | $7700.00 | Window Closed / Lapsed |