The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Apr. 15, 2003
Filed:
Jun. 23, 2000
Nobuo Ohkawai, Shizuoka, JP;
Yoshitaka Ohshima, Shizuoka, JP;
Shinichi Irisawa, Shizuoka, JP;
Masakazu Nagasawa, Shizuoka, JP;
Koito Manufacturing Co., Ltd., Tokyo, JP;
Abstract
A method of manufacturing an arc tube for a discharge lamp unit, incorporating a primary pinch-sealing step for mounting an electrode assembly in an open end of a glass tube W with a chamber portion . The electrode assembly comprises an electrode rod , a connecting foil and a lead wire integrally connected in series. The electrode assembly is inserted into an open end of the glass tube W such that a leading end of the electrode rod projects into the chamber portion . A temporary pinch seal region L of the glass tube W is pinch-sealed such that a portion of the connecting foil that is connected to the lead wire is contacted by the glass tube W. A vacuum is maintained inside the glass tube and a main pinch seal region L of the glass tube is pinch-sealed such that a portion of the connecting foil connected to the electrode rod is contacted by the glass tube. When the main pinch seal region L of glass tube W is pinch-sealed, the negative pressure in the glass tube W is exerted on the softened sealed chamber portion owing to supplied heat as well as the pressure exerted from the pincher . Thus, the glass layer is pressed against the surface of the molybdenum foil so that hermetic contact is realized.