Methods of making fluorescent surfaces in beam index type colour cathode ray tubes

(19)

(11)

EP 0 175 520 A3

(12)	EUROPEAN PATENT APPLICATION

(88)	Date of publication A3:
	13.01.1988 Bulletin 1988/02

(43)	Date of publication A2:
	26.03.1986 Bulletin 1986/13

(21)	Application number: 85306303

(22)	Date of filing: 05.09.1985

(84)	Designated Contracting States:
	DE FR GB

(30)

Priority:

07.09.1984 JP 18736784

(71)	Applicant: SONY CORPORATION
	()

(72)	Inventors:
	Kato, Hiroshi c/o Patents Division () Saito, Reiko c/o Patents Division ()

(54)	Methods of making fluorescent surfaces in beam index type colour cathode ray tubes

(57) A method of manufacturing a fluorescent surface of a beam index type colour cathode ray tube comprises successively forming a photosensitive resin layer (1) and an index fluorescent material layer (11) on a metal backing layer (2), and effecting exposure, development and removal of undeveloped resin (10) to form clearly spaced index fluorescent material stripes (ID).

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