Patent ID: 7097528
Filing Date: 2006-08-29
Classification: H01J,H01K

Abstract:
1. A method for producing a high pressure discharge lamp comprising a luminous bulb enclosing a luminous substance inside and a sealing portion for retaining the airtightness of the luminous bulb, the method comprising the steps of: preparing a glass pipe for a discharge lamp including a luminous bulb portion that will be formed into a luminous bulb of a high pressure discharge lamp and a side tube portion extending from the luminous bulb portion; introducing mercuric bromide (HgBr forming the sealing portion from the side tube portion, wherein the formation step of the sealing portion comprises the substeps of: inserting, into the side tube portion, a glass member made of a second glass having a softening point lower than that of a first glass constituting the side tube portion, and then heating the side tube portion to tightly attach the glass member to the side tube portion; and heating, after the attachment substep, a portion including at least the glass member and the side tube portion at a temperature higher than the strain point temperature of the second glass.