Glass bulb for a cathode ray tube and a method for producing a cathode ray tube
AssigneeAsahi Glass Company, Limited
InventorMasayuki Shinoda
Life of this patent
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Abstract
Manufacturing steps for a cathode ray tube or a glass bulb for the cathode ray tube are controlled in such a manner that a two-dimensional matrix code 3 comprised of a plurality of dots is marked by laser in an outer side surface of a glass bulb 1, 5, the two-dimensional matrix code 3 containing the information which can identify individually glass bulbs, and the manufacturing steps are conducted by using a computer and the particulars specified by the serial information.
Claims7
A glass bulb for a cathode ray tube which has an outer side surface in which a two-dimensional matrix code comprised of a plurality of dots marked by laser is formed, wherein each dot has a recess having a depth of 5-100 μm and a diameter of 50-400 μm.
Dependencies are inferred from the claim text.