Patent ID: 9152026
Filing Date: 2015-10-06
Classification: G03B,H01J

Abstract:
1. A discharge lamp comprising: a pair of electrodes for discharge; and a discharge container having an inner space formed by quartz glass for separately placing the pair of electrodes and enclosing a discharge medium therein, a bulging part that surrounds the inner space, a pair of sealing parts that extend from ends of the bulging part and respectively support the pair of electrodes, and an inner protective layer provided from a top portion opposed to a center of the pair of electrodes to a peripheral portion located at sides of the pair of sealing parts on an inner surface of the bulging part and having a thickness of the peripheral portion thinner than that of the top portion, wherein a thickness of the inner protective layer is from 1 μm to 20 μm in the top portion and equal to or more than 0.1 μm and less than 1 μm in the peripheral portion at the sides of the pair of sealing parts.