Discharge lamp, light source device and projector
AssigneeSeiko Epson Corporation
InventorYoshihide Nishiyama
Life of this patent
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Abstract
A discharge lamp includes 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, 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.
Claims15
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.
A projector comprising:
- a light source device including
- a discharge lamp having 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, and
- a reflector that reflects luminous flux output from the discharge lamp;
- a light modulation device illuminated by illumination light from the light source device;
- and
- a projection lens that projects light modulated by the light modulation device,
- 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.
Dependencies are inferred from the claim text.