| 摘要 |
An installation device of an optical system is provided to reduce the mismatching of a screen due to the improved flatness of an engine base on which the optical system is mounted to improve image quality, increase the life of the optical system, and reduce influence of external impact on the optical system. An engine base of an optical system includes an engine base opening portion(15) and a support plate(13). The engine base supports the optical system in the lower side. The opening portion is formed in a portion where the engine base supports the optical system. The support plate is set in the opening portion and has a high flatness. The opening portion is provided in a position where the opening portion is arranged with at least a lighting system and a composition system.
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