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    • 93. 发明授权
    • Image projector
    • 图像投影仪
    • US6149276A
    • 2000-11-21
    • US235759
    • 1999-01-25
    • Tadashi TakeuchiHiroshi Uchida
    • Tadashi TakeuchiHiroshi Uchida
    • G02F1/13G02B13/00G02B27/14G02B27/18G03B21/00H04N9/31G03B21/14
    • G02B27/145G02B13/0095G02B27/149H04N9/3105
    • There is provided an image projector including (a) a light source, (b) a reflection mirror for reflecting flux of light emitted from the light source, (c) an image display unit for forming images, and (d) a relay system for transferring the flux of light to the image display unit, the relay system including a relay lens having a first convex surface through which the flux of light enters therein and a second convex surface through which the flux of light exits therefrom, a ratio of a radius of curvature of the first convex surface to a radius of a curvature of the second convex surface being determined in such a manner that aberration out of an optical axis of the relay lens is increased to thereby cause a converging point of the flux of light to displace from a calculated focal distance. For instance, the ratio is determined in the range of about 1:2 to about 1:3. The relay lens preferably has a focal distance in the range of about 40 to 60 mm, and is made of material having an index of refraction in the range of about 1.5 to 1.65. The above-mentioned image projector increases aberration thereof. If a relay lens has greater aberration, a greater amount of flux of light is converged at a point spaced away from a focus in an optical axis of the relay lens. As a result, it is possible to compensate for non-uniformity in brightness, caused by dispersion in a converging point in a projection lens.
    • 提供了一种图像投影仪,其包括(a)光源,(b)用于反射从光源发射的光的光的反射镜,(c)用于形成图像的图像显示单元,以及(d) 将光通量转移到图像显示单元,所述继电器系统包括中继透镜,所述中继透镜具有第一凸表面,光通量穿过所述第一凸表面入射到所述第一凸表面中,所述第二凸表面通过所述第二凸表面从所述第一凸表面射出半径 所述第一凸面的曲率半径相对于所述第二凸面的曲率的半径以使得所述中继透镜的光轴的像差出现增加的方式来确定,从而使得所述光通量的会聚点位移 从计算的焦距。 例如,该比例在约1:2至约1:3的范围内确定。 中继透镜优选具有在约40至60mm范围内的焦距,并且由折射率在约1.5至1.65范围内的材料制成。 上述图像投影仪增加其像差。 如果中继透镜具有更大的像差,则在中继透镜的光轴上离开焦点的点处会聚较大量的光束。 结果,可以补偿由投影透镜中的会聚点的分散引起的亮度的不均匀性。