Curved lamp manufacturing method, curved lamp, and backlight unit
US7405520B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Mar 18, 2005 |
| Grant date | Jul 29, 2008 |
| Priority date | — |
| Expiry date | Nov 9, 2026 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01J61/325
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
A curved lamp manufacturing method including a curving process in which a straight glass tube sealed with reduced pressure inside is heated and curved. The curving process includes: a first step of holding a predetermined portion of the glass tube using a first chuck, and holding one end portion of the glass tube using a second chuck such that the second chuck can slide in a longitudinal direction of the glass tube; and a second step of, while heating a planned curved portion of the glass tube positioned between the predetermined portion and the end portion by a heater, curving the planned curved portion by moving the second chuck relative to the glass tube. The end portion is moved in the second step so that a weight of the end portion is applied to the planned curved portion that has been softened by the heater.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.