Overhead projector
    41.
    发明授权
    Overhead projector 失效
    难搞的项目

    公开(公告)号:US4338006A

    公开(公告)日:1982-07-06

    申请号:US112353

    申请日:1980-01-15

    申请人: Jiro Ozeki

    发明人: Jiro Ozeki

    IPC分类号: G03B21/132 G03B21/20

    CPC分类号: G03B21/132 Y10S353/03

    摘要: A disclosed projector includes a condenser lens, a plurality of light source means having different focal lengths and disposed around the condenser lens, a projecting lens with an adjustable distance from the condenser lens, and a stage glass located between the condenser and projecting lens for carrying a transparent positive thereon. Depending on the size of the transparent positive, one of the light source means is selected and the distance between the condenser and projecting lens is adjusted, so as to project an image of substantially fixed magnitude with a constant brightness regardless of said size of the transparent positive.

    摘要翻译: 所公开的投影仪包括聚光透镜,具有不同焦距并且设置在聚光透镜周围的多个光源装置,具有与聚光透镜可调距离的投影透镜,以及位于聚光镜和投影透镜之间的载玻片,用于承载 透明正面。 根据透明阳性的大小,选择光源装置中的一个,调整聚光镜和投影透镜之间的距离,以便以恒定的亮度投射基本上固定的大小的图像,而不管透明的所述尺寸如何 正。

    Overhead projection apparatus
    42.
    发明授权
    Overhead projection apparatus 失效
    OVERHEAD投影设备

    公开(公告)号:US3711194A

    公开(公告)日:1973-01-16

    申请号:US3711194D

    申请日:1965-10-24

    申请人: WILSON H

    发明人: WILSON H

    IPC分类号: G03B21/132 G03B21/28

    CPC分类号: G03B21/132 Y10S353/03

    摘要: Projection apparatus embodying a housing having a lamp casing therein for projecting a light beam onto a reflective surface that directs the beam upwardly through a film and into a lens assembly for ultimate projection of an image onto a screen, wherein the lens assembly is carried on a telescopic mast that may collapse into the housing and is adjustable to vary the angle of the projected image.

    摘要翻译: 具有壳体的投影设备,其中具有灯壳,用于将光束投射到反射表面上,该反射表面将光束向上引导通过膜并进入透镜组件,以将图像最终投影到屏幕上,其中透镜组件承载在 可伸缩桅杆可能会塌陷到外壳中,并可调节以改变投影图像的角度。