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Document Type and Number:
Japanese Patent JP3931529
Kind Code:

PROBLEM TO BE SOLVED: To provide a structure which can prevent scatter of fragments by a simple means when a discharge lamp in a concave reflector having an opening for ventilation should suffer a damage such as bursting.
SOLUTION: The light source unit comprises following parts that a luminescence part (11) electric discharge container that sealing parts (12) are formed at both ends and consisting of quartz glass, a high pressure mercury lamp (10) of which the pair of electrodes are disposed opposite to each other in the container (11), the reflector (20) covering the lamp (10), a base member (30) which holds one end of the lamp (10) and is fixed on an outer surface of a neck of the reflector (20), and a front glass (60) closing a front opening of the reflector (20) in rough airtight. Between the base member (30) and the neck of the reflector (20), there is formed the opening (23) for cool air, which is spatially connected to the inside of the reflector (20). In the opening (23), there is installed a protective netting member (60) for fragments forming an arc tube.

Furukawa, Yasuo
Application Number:
Publication Date:
March 23, 2007
Filing Date:
April 26, 2000
Export Citation:
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International Classes:
F21V19/00; F21V29/00; F21V15/00; F21V15/02; F21V25/12; H01J61/20; F21Y101/00; (IPC1-7): F21V19/00; F21V25/12; F21V29/00; H01J61/20; //F21Y101:00