High pressure discharge lamp, method for producing the same and lamp unit

摘要

A high pressure discharge lamp (100) comprises a luminous bulb (1) enclosing a luminous substance (6) inside and a sealing portion (2) for retaining the airtightness of the luminous bulb (1). The sealing portion (2) has a first glass portion (8) extending from the luminous bulb (1) and a second glass portion (7) having a lower softening point provided at least in a portion of the inside of the first glass portion (8), and further has a portion (20) to which a compressive stress is applied after heating it above the strain point temperature of the second glass. In the luminous bulb (1), mercuric bromide (HgBr2) is enclosed.