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.
Claims10
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.
A method for producing a glass bulb for a cathode ray tube which comprises:
- a step of marking by laser a two-dimensional matrix code comprised of a plurality of dots in an outer side surface of a glass bulb for a cathode ray tube, which is in a state of being heated at 200-500° C. after having been formed,
- a step of reading information contained in the two-dimensional matrix code, and
- a step of controlling operations after the forming of the glass bulb based on the read information, wherein the two-dimensional matrix code includes at least the information which can identify individually glass bulbs for cathode ray tubes.
A method for producing a cathode ray tube which comprises:
- a step of identifying a glass bulb for a cathode ray tube by reading two-dimensional matrix code comprised of a plurality of dots formed in an outer side surface of the glass bulb,
- a step of determining by a control device at least desirable operating conditions for the identified glass bulb in response to the information inherent to the identified glass bulb,
- a step of reading sequentially the two-dimensional matrix code in manufacturing steps to extract information for desirable operating conditions determined for the glass bulb from the control device, and
- a step of conducting operations instructed by the control device, wherein the two-dimensional matrix code includes at least the information which can identify individually glass bulbs for cathode ray tubes, and a part or all of the manufacturing steps are controlled on the basis of the information.
Dependencies are inferred from the claim text.