GB1301379A – – Google Patents
GB1301379A – – Google Patents
Info
Publication number
GB1301379A
GB1301379A
GB1301379DA
GB1301379A
GB 1301379 A
GB1301379 A
GB 1301379A
GB 1301379D A
GB1301379D A
GB 1301379DA
GB 1301379 A
GB1301379 A
GB 1301379A
Authority
GB
United Kingdom
Prior art keywords
amplifier
transformer
screen
output
circuits
Prior art date
1969-11-21
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired
Application number
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
1969-11-21
Filing date
1970-11-20
Publication date
1972-12-29
1970-11-20
Application filed
filed
Critical
1972-12-29
Publication of GB1301379A
publication
Critical
patent/GB1301379A/en
Status
Expired
legal-status
Critical
Current
Links
Espacenet
Global Dossier
Discuss
Classifications
H—ELECTRICITY
H03—ELECTRONIC CIRCUITRY
H03K—PULSE TECHNIQUE
H03K3/00—Circuits for generating electric pulses; Monostable, bistable or multistable circuits
H—ELECTRICITY
H03—ELECTRONIC CIRCUITRY
H03K—PULSE TECHNIQUE
H03K17/00—Electronic switching or gating, i.e. not by contact-making and –breaking
H03K17/04—Modifications for accelerating switching
H03K17/041—Modifications for accelerating switching without feedback from the output circuit to the control circuit
H03K17/04113—Modifications for accelerating switching without feedback from the output circuit to the control circuit in bipolar transistor switches
H—ELECTRICITY
H04—ELECTRIC COMMUNICATION TECHNIQUE
H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
H04N9/00—Details of colour television systems
H04N9/12—Picture reproducers
H04N9/16—Picture reproducers using cathode ray tubes
H04N9/27—Picture reproducers using cathode ray tubes with variable depth of penetration of electron beam into the luminescent layer, e.g. penetrons
Abstract
1301379 Semi-conductor switching circuits; cathode-ray tube circuits COMPAGNIE GENERALE D’ELECTRICITE 20 Nov 1970 [21 Nov 1969 21 April 1970] 55415/70 Headings H3T and H4T A capacitive load such as the screen 4 of a dichromatic C.R.T. 2 is switched between two voltage levels by a switching circuit 10 fed by a voltage supply 8, and to speed up the change in levels, further charge and discharge paths are provided which include respective diodes 62, 63 and means such as transformers 60, 61 which respond to a further output of the switching circuit 10. The supply voltage 8 of 21KV is applied across R12, a valve 14 and transistor 16 whose base current controls the anode potential of V14 which is applied to C.R.T. screen 4. This anode potential is compared in a saturating differential amplifier 20 with the voltage from an electronic switch 22 the amplifier output thus changing T16 base current in response to switch 22. The output of the amplifier also feeds threshold circuits 52, 53 which respond to positive and negative going amplifier outputs respectively to supply a positive pulse at 32 or 33 which is amplified 40, 41 and fed to the transformer 60 or 61. If the screen is to be charged from 6KV to 14 KV to change the spot colour from red to green, V14 anode goes from 6 to 14 KV, and simultaneously the amplifier 40 reponds to threshold circuit 52 to produce in the secondary of transformer 60 a + 8KV pulse which adds to the + 6KV of the e.m.f. source 70 to boost via diode 62 the charging action. A negative output from the amplifier 20 similarly produces in transformer 61 secondary pulse of -8KV which cancels the 8KV of source 72 and causes the screen to discharge to the 6KV of source 70. The sources 70, 72 consist of Zener diodes and a parallel capacitor (Figs. 2, 3, not shown). To prevent possible oscillation due to the transformer inductances from operating the discharge amplifier 41 soon after operation of the charge amplifier 40, each amplifier is driven by an AND gate 54, 55 responsive to the respective threshold circuit outputs 52; 53 and also to the inverted and prolonged outputs of the opposite threshold circuits 53, 52; these inverted signals effectively inhibit each gate for a given time after receipt of a signal at the other gate.
GB1301379D
1969-11-21
1970-11-20
Expired
GB1301379A
(en)
Applications Claiming Priority (2)
Application Number
Priority Date
Filing Date
Title
FR6940153A
FR2067926A5
(en)
1969-11-21
1969-11-21
FR7014467A
FR2085435A6
(en)
1969-11-21
1970-04-21
Publications (1)
Publication Number
Publication Date
GB1301379A
true
GB1301379A
(en)
1972-12-29
Family
ID=26215381
Family Applications (1)
Application Number
Title
Priority Date
Filing Date
GB1301379D
Expired
GB1301379A
(en)
1969-11-21
1970-11-20
Country Status (9)
Country
Link
US
(1)
US3697880A
(en)
JP
(1)
JPS5038496B1
(en)
BE
(1)
BE758796A
(en)
CH
(1)
CH519828A
(en)
DE
(1)
DE2056797C3
(en)
FR
(2)
FR2067926A5
(en)
GB
(1)
GB1301379A
(en)
NL
(1)
NL171316C
(en)
SE
(1)
SE356662B
(en)
Families Citing this family (10)
* Cited by examiner, † Cited by third party
Publication number
Priority date
Publication date
Assignee
Title
FR2218698B1
(en)
*
1973-02-20
1976-05-14
Cit Alcatel
FR2366741A1
(en)
*
1976-10-01
1978-04-28
Cit Alcatel
SWITCHABLE VERY HIGH VOLTAGE GENERATOR
JPS5364291U
(en)
*
1976-11-02
1978-05-30
US4104564A
(en)
*
1976-12-27
1978-08-01
Venus Scientific Inc.
High switching speed high voltage power supply
US4151444A
(en)
*
1977-12-23
1979-04-24
Tektronix, Inc.
Voltage switching circuit for a color display system
FR2435876A1
(en)
*
1978-09-08
1980-04-04
Thomson Csf
VERY HIGH VOLTAGE SWITCHING TYPE POWER SUPPLY
US4442451A
(en)
*
1981-05-01
1984-04-10
United Technologies Corporation
Differential random color switch for beam penetration CRT
US4476485A
(en)
*
1981-05-01
1984-10-09
United Technologies Corporation
Constant current bias color switch for a beam penetration CRT
JPS60113983U
(en)
*
1984-01-07
1985-08-01
赤井電機株式会社
AC plug removal device for AC outlet sockets, etc.
IT1231026B
(en)
*
1989-07-31
1991-11-08
Salvatore Pranzo
POLYCHROME MONITOR PERFECTED FOR THE VISUALIZATION OF IMAGES AND / OR TEXTS IN MORE COLORS.
Family Cites Families (4)
* Cited by examiner, † Cited by third party
Publication number
Priority date
Publication date
Assignee
Title
US3413409A
(en)
*
1965-12-27
1968-11-26
Polaroid Corp
Color television system with means for preventing kinescope misregistration
US3396233A
(en)
*
1966-02-07
1968-08-06
Polaroid Corp
High-voltage switching for two-color line-sequential color television
US3496405A
(en)
*
1967-03-31
1970-02-17
Texas Instruments Inc
Apparatus for generating a stepped voltage waveform
US3522368A
(en)
*
1967-04-10
1970-07-28
Texas Instruments Inc
Color display system
0
BE
BE758796D
patent/BE758796A/en
unknown
1969
1969-11-21
FR
FR6940153A
patent/FR2067926A5/fr
not_active
Expired
1970
1970-04-21
FR
FR7014467A
patent/FR2085435A6/fr
not_active
Expired
1970-11-09
CH
CH1654770A
patent/CH519828A/en
not_active
IP Right Cessation
1970-11-18
DE
DE2056797A
patent/DE2056797C3/en
not_active
Expired
1970-11-19
NL
NLAANVRAGE7016933,A
patent/NL171316C/en
not_active
IP Right Cessation
1970-11-20
JP
JP45102048A
patent/JPS5038496B1/ja
active
Pending
1970-11-20
GB
GB1301379D
patent/GB1301379A/en
not_active
Expired
1970-11-20
SE
SE15771/70A
patent/SE356662B/xx
unknown
1970-11-23
US
US92115A
patent/US3697880A/en
not_active
Expired – Lifetime
Also Published As
Publication number
Publication date
CH519828A
(en)
1972-02-29
BE758796A
(en)
1971-05-12
DE2056797B2
(en)
1978-02-16
DE2056797A1
(en)
1971-06-03
DE2056797C3
(en)
1978-10-19
NL171316C
(en)
1983-03-01
FR2085435A6
(en)
1971-12-24
NL7016933A
(en)
1971-05-25
NL171316B
(en)
1982-10-01
FR2067926A5
(en)
1971-08-20
SE356662B
(en)
1973-05-28
US3697880A
(en)
1972-10-10
JPS5038496B1
(en)
1975-12-10
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Legal Events
Date
Code
Title
Description
1973-05-09
PS
Patent sealed [section 19, patents act 1949]
1981-07-08
PCNP
Patent ceased through non-payment of renewal fee
