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    • 80. 发明授权
    • Projection lens system and projection image display apparatus using the same
    • 投影透镜系统和使用其的投影图像显示装置
    • US06243211B1
    • 2001-06-05
    • US09495908
    • 2000-02-02
    • Koji HirataNaoyuki OguraShigeru MoriTakahiro YoshidaKazunari Nakagawa
    • Koji HirataNaoyuki OguraShigeru MoriTakahiro YoshidaKazunari Nakagawa
    • G02B300
    • G02B13/06H04N5/74
    • When a projection lens system used for a rear projection type image display apparatus has a first lens group having an aspherical lens surface, a second lens group, a third lens group sharing almost all the positive refractive power of the overall system, a fourth lens group having an aspherical lens surface, a fifth lens group, and a sixth lens group including a lens having a profile of aspherical surface in which the concave surface thereof faces the screen side and the refractive power in the marginal area is weaker than the refractive power around the optical axis, a projection lens system having a large aperture ratio (low F-number), high focus, wide field angle, and sufficient marginal light amount ratio can be realized at a low cost. When a predetermined opening portion is formed in the projection lens and lens barrel, the lens elements are cooled by air suction and exhaust and the lowering of the lens performance due to temperature change can be prevented. When a flange is arranged in a suitable location of the opening portion, entry of a foreign material from the opening portion and light leakage from the inside are prevented and the contrast performance of the projection type image display apparatus can be prevented from lowering.
    • 当用于背投型图像显示装置的投影透镜系统具有具有非球面透镜表面的第一透镜组,第二透镜组,共享整个系统的几乎全部正折射力的第三透镜组时,第四透镜组 具有非球面透镜表面,第五透镜组和第六透镜组,所述第六透镜组包括具有非球面形状的透镜,其中凹面朝向屏幕侧,并且边缘区域中的折光力弱于周围的折光力 可以以低成本实现光轴,具有大开口率(低F值),高焦距,宽视野角和足够的边缘光量比的投影透镜系统。 当在投影透镜和透镜镜筒中形成预定的开口部分时,透镜元件通过吸气和排气被冷却,并且可以防止由于温度变化引起的透镜性能的降低。 当凸缘布置在开口部分的适当位置时,防止异物从开口部分进入并从内部漏光,并且可以防止突起型图像显示装置的对比度性能降低。