Stop plate in unmagnification image forming element
专利汇可以提供Stop plate in unmagnification image forming element专利检索，专利查询，专利分析的服务。并且PURPOSE: To decrease the interval between a plate lens and a roof mirror array and to reduce the attenuation of light, and to obtain a bright light image which is good in light utilization efficiency and has no irregularity in light quantity by cutting off ghost like stray light effectively by light shield walls which are positioned at opening parts of the stop plate and reducing the thickness of the stop plate.
CONSTITUTION: The light shield walls 62 are provided at the respective opening parts 61 of the stop plate 6 in parallel to the optical axis and the thickness d
1 of the stop plate 6 is reduced to remove the stray light affecting the image forming performance, thereby forming a bridge 63 small. When the constitution of a lens 4a of the plate lens 4 is determined, the limit incidence angles of reflected ghost like stray light beams which are reflected once and twice are determined by simulation such as ray tracing. The plate thickness d
1 of the stop plate 6 is reduced to specific thickness on the assumption of the angles and sufficient intervals of the light shield walls 62 for cutting off the ghost like stray light at the opening parts 61 of the stop plate 6 are determined. Consequently, the interval between the plate lens 4 and roof mirror array 5 is decreased to reduce the attenuation of light and improve the light utilization efficiency, thereby enabling bright unmagnification image formation.
COPYRIGHT: (C)1990,JPO&Japio，下面是Stop plate in unmagnification image forming element专利的具体信息内容。
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