GB495732A - Improvements in or relating to cathode ray tuning indicators - Google Patents

Improvements in or relating to cathode ray tuning indicators

Info

Publication number
GB495732A
GB495732A GB23298/37A GB2329837A GB495732A GB 495732 A GB495732 A GB 495732A GB 23298/37 A GB23298/37 A GB 23298/37A GB 2329837 A GB2329837 A GB 2329837A GB 495732 A GB495732 A GB 495732A
Authority
GB
United Kingdom
Prior art keywords
anode
cathode
ring
conical
coaxial
Prior art date
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
GB23298/37A
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.)
HERBERT SIDNEY SMITH
Mi O Valve Co Ltd
Original Assignee
HERBERT SIDNEY SMITH
Mi O Valve Co Ltd
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.)
Filing date
Publication date
Priority to BE429825D priority Critical patent/BE429825A/xx
Application filed by HERBERT SIDNEY SMITH, Mi O Valve Co Ltd filed Critical HERBERT SIDNEY SMITH
Priority to GB23298/37A priority patent/GB495732A/en
Priority to FR842452D priority patent/FR842452A/en
Publication of GB495732A publication Critical patent/GB495732A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J31/00—Cathode ray tubes; Electron beam tubes
    • H01J31/08—Cathode ray tubes; Electron beam tubes having a screen on or from which an image or pattern is formed, picked up, converted, or stored
    • H01J31/10—Image or pattern display tubes, i.e. having electrical input and optical output; Flying-spot tubes for scanning purposes
    • H01J31/12—Image or pattern display tubes, i.e. having electrical input and optical output; Flying-spot tubes for scanning purposes with luminescent screen
    • H01J31/14—Magic-eye or analogous tuning indicators

Landscapes

  • Measurement Of Radiation (AREA)

Abstract

495,732. Discharge apparatus. M-O VALVE CO., Ltd., BENJAMIN, M., and SMITH, H. S. Aug. 25, 1937, No. 23298. [Class 39 (i)] A tuning indicator comprises a conical anode 3 coated with luminescent material on part of its interior surface, a conical or cylindrical cathode 2 coaxial with and within the anode, the length of the cathode parallel to the axis being much less than the length parallel to the axis of the coated part, and a control electrode 4 in the form of a ring coaxial with the anode, wider than the cathode and preferably displaced towards the narrow end of the anode. As shown the control ring projects just within the narrow end of the cone 3. The indicator is associated with a triode portion, the anode 5 being connected to the control electrode and through a resistance 7 to the anode 3 and a positive potential. When a signal is applied to the control grid 6 the current through 7 increases, the ring 4 becomes less positive relatively to the cathode 2 and the annular fluorescent portion expands. The narrow band of emissive material may be contained in an annular groove in the cathode core or confined between two bands of nickel ; preferably it is applied with a draughtsman's pen.
GB23298/37A 1937-08-25 1937-08-25 Improvements in or relating to cathode ray tuning indicators Expired GB495732A (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
BE429825D BE429825A (en) 1937-08-25
GB23298/37A GB495732A (en) 1937-08-25 1937-08-25 Improvements in or relating to cathode ray tuning indicators
FR842452D FR842452A (en) 1937-08-25 1938-08-22 Tuning indicator for radio receiver

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB23298/37A GB495732A (en) 1937-08-25 1937-08-25 Improvements in or relating to cathode ray tuning indicators

Publications (1)

Publication Number Publication Date
GB495732A true GB495732A (en) 1938-11-18

Family

ID=10193366

Family Applications (1)

Application Number Title Priority Date Filing Date
GB23298/37A Expired GB495732A (en) 1937-08-25 1937-08-25 Improvements in or relating to cathode ray tuning indicators

Country Status (3)

Country Link
BE (1) BE429825A (en)
FR (1) FR842452A (en)
GB (1) GB495732A (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2465041A (en) * 1942-12-12 1949-03-22 Svenska Elektronror Ab Electron discharge device
US2486814A (en) * 1944-10-07 1949-11-01 Gen Electric Electric discharge device of the indicator type
DE975723C (en) * 1951-12-06 1962-06-28 Telefunken Patent Circuit for voting display
US3065368A (en) * 1957-12-27 1962-11-20 Westinghouse Electric Corp Cathode ray device

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2465041A (en) * 1942-12-12 1949-03-22 Svenska Elektronror Ab Electron discharge device
US2486814A (en) * 1944-10-07 1949-11-01 Gen Electric Electric discharge device of the indicator type
DE975723C (en) * 1951-12-06 1962-06-28 Telefunken Patent Circuit for voting display
US3065368A (en) * 1957-12-27 1962-11-20 Westinghouse Electric Corp Cathode ray device

Also Published As

Publication number Publication date
BE429825A (en)
FR842452A (en) 1939-06-13

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