US2188647A - Cathode ray apparatus - Google Patents

Cathode ray apparatus Download PDF

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Publication number
US2188647A
US2188647A US64003A US6400336A US2188647A US 2188647 A US2188647 A US 2188647A US 64003 A US64003 A US 64003A US 6400336 A US6400336 A US 6400336A US 2188647 A US2188647 A US 2188647A
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United States
Prior art keywords
energy
cathode ray
frequency
anode
ray tube
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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 - Lifetime
Application number
US64003A
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English (en)
Inventor
Busse Ernst
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
RCA Corp
Original Assignee
RCA Corp
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Filing date
Publication date
Application filed by RCA Corp filed Critical RCA Corp
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Publication of US2188647A publication Critical patent/US2188647A/en
Anticipated expiration legal-status Critical
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N3/00—Scanning details of television systems; Combination thereof with generation of supply voltages
    • H04N3/10—Scanning details of television systems; Combination thereof with generation of supply voltages by means not exclusively optical-mechanical
    • H04N3/16—Scanning details of television systems; Combination thereof with generation of supply voltages by means not exclusively optical-mechanical by deflecting electron beam in cathode-ray tube, e.g. scanning corrections
    • H04N3/18—Generation of supply voltages, in combination with electron beam deflecting

Definitions

  • My present invention relates to a television cathode ray tube and more particularly to a method and an arrangement for supplying anode voltage to a. television cathode ray tube by means of a rectified and smoothed alternating current.
  • a weak high voltage current is usually required as anode current.
  • this current is obtained by applying the alternating current ofga power net-work to a transformer having a suitable transformation ratio and by sub# sequently rectifying and smoothing the high voltage alternating current obtained in this manner.
  • comparatively large smoothing condensers are necessary on account of the low frequency of the alternating current. Due to the large quantities of energy stored in these large condensers severe injuries and even death of persons fortuitously touching voltage carrying parts ⁇ may occur.
  • Another object of my invention is to reduce the size of the smoothing means necessary in a supply circuit of a television cathode ray tube.
  • the frequency of the alternating feed current is made equal to the line deiiection frequency, the alternating feed current being rectified after step up transformation, and subsequently smoothed by extremely small smoothing means, voltage variations in the 1936, Serial No. 64.003 1935 rhythm of the line deflection frequency will still occur in the output of the smoothing circuit. Due to these voltage variations one side of the picture will appear to be slightly darker than the rest of the picture. This would not be disturbing however, if the screen is suitably constructed. On the other hand the positions and the lines and points would be slightly changed in this darker part of the picture. Since, however, this position variation is confined to the same part of the picture it may be readily compensated by suitable measures, for instance by ⁇ a suitable design of the deflections means. In this manner very small smoothing condensers will be sufficient, so that a fortuitous contact with the supply circuit needs no longer be dargerous to life. l
  • the saw tooth generator for producing the line deflection frequency also supplies the alternating feed current for the anode of the cathode ray tube.
  • a suitable mechanical or electric coupling is provided between the line deflection generator and the feed current generator.
  • Still another embodiment of my invention comprises a resonance circuit sharply tuned to the frequency of the alternating feed current and being coupled to the feed current generator.
  • this resonance circuit is so designed that in the case of contact with one of its parts a strong detuning occurs by which the voltage in the circuit drops immediately in a known manner.
  • the radio receiver I may comprise any number of radio frequency amplifier stages, followed by a first detection and by a plurality of intermediate frequency amplifier stages, as is well known in the art.
  • the last tube of the radio receiver I will be a second detector and the output of this second detector is fed to a filter F, which separates the picture currents from the synchronizing impulses.
  • the picture currents are amplified in a picture current amplifier PCA and are subsequently applied to the control grid of a cathode ray tube CRT.
  • the cathode ray tube CRT comprises the usual electrongun and a pair of horizontal and vertical deflection coils.
  • the tube is not described more extensively.
  • the synchronizing impulses are fed from the iilter F to an amplitude filter AF which separates the line and picture frame impulses from each other.
  • the line impulses are fed to a horizontal saw tooth generator 3 and synchronize this generator with the generator used in the transmitter.
  • the pictureeframe synchronizing impulses synchronize the vertical saw tooth generator 4.
  • the output of the generator 3 is fed to the horizontal deflecting coils 5, while the output of the generator 4 is fed to the vertical deecting coils 6.
  • a part of the output of the horizontal saw tooth generator 3 is supplied to a frequency divider FD, which may be any frequency dividing arrangement known in the art.
  • the frequency divider FD produces an alternating feed current of which the frequency stands in a simple constant relation to the line deflection frequency.
  • the output of the frequency divider FD is transformed to the required voltage by a step up transformer 8 and subsequently rectified by a. diode 9 and smoothed by a smoothing circuit l0, comprising extremely small smoothing condensers on the order of 100 micromicro-farad capacity.
  • the output voltage of the smoothing circuit i is fed to the anode 1 and to the second anode Il of the cathode ray tube.
  • a cathode ray tube having an anode
  • the method of energizing the anode of the cathode ray tube which comprises the steps of generating a sawtooth wave voltage of predetermined frequency, deriving a portion of the generated energy, converting the derived energy to energy of a frequency bearing -harmonic relation to the generated energy, rectifying the converted energy, illtering the rectified energy and supplying the illtered energy to the anode.
  • a ⁇ v cathode ray tube having an anode
  • the method of energizing the anode which comprises the steps of generating saw-tooth wave energy of predetermined frequency, deriving a portion of the generated energy, converting the derived portion of the generated energy to energy of a frequency bearing an harmonic relation to the generated energy, rectifying the converted energy, filtering the rectified energy, supplying the ltered energy to the anode, and reducing the value of the energy in accordance with variation of stray capacities in the system.
  • a television system comprising a cathode ray tube having an anode, a saw-tooth wave oscillator of predetermined frequency for deiiectlng a beam of electrons to be generated within said cathode ray tube, means for deriving energy from the saw-tooth wave oscillator, means for converting the derived energy to energy bearing a harmonic relationship to the frequency of the saw tooth oscillator, and means for feeding the convertedv energy to the anode of the cathode ray tube.
  • a television system comprising a cathode ray tube having an anode, a saw-tooth wave oscillator of predetermined frequency for deiiecting a beam of electrons to be generated within said cathode ray tube, means for deriving energy from the saw-tooth wave oscillator, means for converting the derived energy to energy bearing a. harmonic relationship to the frequency of the saw-tooth oscillator, means to rectify the converted energy, means to filter the rectified energy, and means to supply the rectified energy to the anode of the cathode ray tube.
  • a television system comprising a cathode ray tube having an anode, a saw-tooth wave oscillator of predetermined frequency for deecting a beam of electrons to be generated within said cathode ray tube, means for deriving energy from the saw-tooth wave oscillator, means for converting the derived energy to energy bearing a harmonic relationship to the frequency of the saw-tooth oscillator, means to rectify the converted energy, filtering means including condensers of very small capacity for smoothing the rectified energy, and means to supply the ltered energy to the anode.
  • Television apparatus comprising a cathode ray tube having an anode, a saw-tooth oscillator, synchronizing means for controlling, the frequency of the saw-tooth oscillator, means for deriving energy from the saw-tooth oscillator, means for rectifying the derived energy, resonant circuit means for filtering the rectified derived energy, said circuit means being detuned in event of contact by a. person, and means for supplying the filtered energy to the anode.
  • a cathode ray tube system comprising a cathode ray tube having a beam of electrons and an anode, a saw-tooth Wave oscillator of predetermined frequency for deecting the beam of electrons, means to derive a portion of the sawtooth wave energy, means to convert the derived portion of energy into direct current energy, means to supply the direct current energy to the anode, and means interposed between said deriving means and converting means to reduce the energy supplied to the anode in the event that said interposed means is touched by a person.

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  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Details Of Television Scanning (AREA)
US64003A 1935-02-18 1936-02-15 Cathode ray apparatus Expired - Lifetime US2188647A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE474434X 1935-02-18

Publications (1)

Publication Number Publication Date
US2188647A true US2188647A (en) 1940-01-30

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ID=6541719

Family Applications (1)

Application Number Title Priority Date Filing Date
US64003A Expired - Lifetime US2188647A (en) 1935-02-18 1936-02-15 Cathode ray apparatus

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US (1) US2188647A (en(2012))
FR (1) FR801369A (en(2012))
GB (1) GB474434A (en(2012))
NL (1) NL45436C (en(2012))

Cited By (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2431051A (en) * 1943-05-08 1947-11-18 Rca Corp Power supply system
US2440538A (en) * 1946-04-26 1948-04-27 Gen Electric Portable cathode-ray oscilloscope
US2440787A (en) * 1945-08-09 1948-05-04 Rca Corp Television tube control system having interconnected deflecting coil and accelerating electrode
US2443030A (en) * 1946-11-09 1948-06-08 Gen Electric Picture size control circuit for television receivers
US2459319A (en) * 1944-10-11 1949-01-18 Rca Corp Cathode-ray oscilloscope
US2494241A (en) * 1946-04-17 1950-01-10 Hartford Nat Bank & Trust Co Circuit arrangement producing a direct voltage for supplying a cathode-ray tube
US2555827A (en) * 1948-10-26 1951-06-05 Rca Corp High-voltage power supply
US2559078A (en) * 1946-08-10 1951-07-03 Rca Corp Television system
US2588652A (en) * 1951-02-17 1952-03-11 Rca Corp High-voltage supply
US2588659A (en) * 1951-03-22 1952-03-11 Rca Corp High-voltage supply
US2648027A (en) * 1951-09-04 1953-08-04 Du Mont Allen B Lab Inc Beam-intensity controlling circuit for cathode-ray oscillograph
US2655615A (en) * 1950-06-22 1953-10-13 Du Mont Allen B Lab Inc Television circuit
US2714176A (en) * 1952-06-28 1955-07-26 Rca Corp Beam-controlling systems for multibeam cathode ray tubes
US2756417A (en) * 1945-12-11 1956-07-24 Everhard H B Bartelink Radar system
US2879447A (en) * 1954-06-18 1959-03-24 Rca Corp Adjustable voltage supplies

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE756668C (de) * 1939-06-21 1954-01-25 Lorenz C Ag Zeilenkippgenerator

Cited By (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2431051A (en) * 1943-05-08 1947-11-18 Rca Corp Power supply system
US2459319A (en) * 1944-10-11 1949-01-18 Rca Corp Cathode-ray oscilloscope
US2440787A (en) * 1945-08-09 1948-05-04 Rca Corp Television tube control system having interconnected deflecting coil and accelerating electrode
US2756417A (en) * 1945-12-11 1956-07-24 Everhard H B Bartelink Radar system
US2494241A (en) * 1946-04-17 1950-01-10 Hartford Nat Bank & Trust Co Circuit arrangement producing a direct voltage for supplying a cathode-ray tube
US2440538A (en) * 1946-04-26 1948-04-27 Gen Electric Portable cathode-ray oscilloscope
US2559078A (en) * 1946-08-10 1951-07-03 Rca Corp Television system
US2443030A (en) * 1946-11-09 1948-06-08 Gen Electric Picture size control circuit for television receivers
US2555827A (en) * 1948-10-26 1951-06-05 Rca Corp High-voltage power supply
US2655615A (en) * 1950-06-22 1953-10-13 Du Mont Allen B Lab Inc Television circuit
US2588652A (en) * 1951-02-17 1952-03-11 Rca Corp High-voltage supply
US2588659A (en) * 1951-03-22 1952-03-11 Rca Corp High-voltage supply
US2648027A (en) * 1951-09-04 1953-08-04 Du Mont Allen B Lab Inc Beam-intensity controlling circuit for cathode-ray oscillograph
US2714176A (en) * 1952-06-28 1955-07-26 Rca Corp Beam-controlling systems for multibeam cathode ray tubes
US2879447A (en) * 1954-06-18 1959-03-24 Rca Corp Adjustable voltage supplies

Also Published As

Publication number Publication date
NL45436C (en(2012))
FR801369A (fr) 1936-08-03
GB474434A (en) 1937-10-26

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