| 摘要 |
PURPOSE:To correct the curvature of a lens and to prevent optical characteristics from varying locally by realizing a uniform and strong force for fixation to the projection side surface of a plastic lens. CONSTITUTION:This system is equipped with a housing 51, a storage part 88 where the plastic lens 60 is installed, cover glass 90 arranged on the projection signal side of the lens 60, a spring material 91 made of a raw material which abuts on the cover glass 90 and has a little permanent strain, and a slit cover material 95 which covers the surface of the spring material 91 - housing 51 at the periphery of the storage part and is fixed directly to the housing 51. Then the spring material 91 is pressed against the projection-side surface of the lens 60 across the cover glass 90 and then the fixation to the projection-side surface of the lens 60 is enabled with the uniform and strong force. Consequently, the curvature of the lens is correct and the optical characteristics are prevented from varying locally.
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