| 摘要 |
A discharge lamp unit has a supporting member supporting a discharge lamp, a circuit substrate supplying electric power to the discharge lamp, a housing case member, a separation wall, and a hollow part. The housing case member supports the circuit substrate in an inside space thereof and the supporting member. The supporting member is exposed to an outside of the housing case member. The separation wall separates the supporting member from the circuit substrate in the inside space of the housing case member. The hollow part is formed between the separation wall and the circuit substrate. When the supporting member is heated by heat energy of the discharge lamp, the separation wall shields the heat conduction from the supporting member to the circuit substrate. The presence of the hollow part between the separation wall and the circuit substrate prevents heat conduction from the discharge lamp side to the circuit substrate.
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