H - Electricity – 01 – J
Patent
H - Electricity
01
J
316/9
H01J 9/24 (2006.01) H01J 9/44 (2006.01)
Patent
CA 1247695
10 ABSTRACT: "Method of manufacturing a cathode ray tube". A method of manufacturing a cathode ray tube, which tube comprises an envelope portion (1) having a lon- gitudinal axis (8) and a gun assembly (32) having a longi- tudinal axis (8), in which a. the envelope portion (1) is fixed in an assembly device (30,31) in a given position, b. the gun assembly (32) is provided in the envelope por- tion (1), the said axes (8) substantially coinciding, c. the location and/or the angle orientation of the gun assembly (32) being adjusted with respect to the axis of the envelope (1), d. the gun assembly is secured in the envelope. The adjustment according to step c according to the invention is carried out by means of a structure (15) connected to the gun assembly (32), which consists of mag- netically half hard material and is magnetized as a multi- pole, and a device having magnetic field-sensitive sensors (20, 21, 22, 23) provided around the envelope (1) at the level of the structure (15), the desired location and orien- tation of the gun assembly being adjusted by rotating and translating (x, y) the gun assembly and observing the field observed by the sensors (20, 21, 22, 23), after which the gun assembly is connected in the envelope, and after which the structure is preferably demagnetized, As a result of this a very accurate adjustment in the tube is obtained.
504191
Fetherstonhaugh & Co.
N.v.philips'gloeilampenfabrieken
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