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    • 2. 发明授权
    • Overhead projector
    • 难搞的项目
    • US4968134A
    • 1990-11-06
    • US367052
    • 1989-06-16
    • Kenichi ShimizuShigeru SuzukiKazuaki Iizuka
    • Kenichi ShimizuShigeru SuzukiKazuaki Iizuka
    • G03B21/132
    • G03B21/132Y10S353/03
    • An overhead projector comprises, a main body, a light source disposed in the main body for emitting a light, a Fresnel lens disposed on an upper surface of the main body, an internal mirror for reflecting the emitted light toward the Fresnel lens, disposed rotatably in the main body such that a portion of the internal mirror is protruded from a bottom of the main body to an outside of the main body upon a use of the projector and is accommodated in the main body upon a non-use of the projector, an arm connected with the main body at one longitudinal end thereof, a projection lens held by the other longitudinal end of the arm for focusing the reflected light which has passed through the Fresnel lens and an original for a projection placed on the Fresnel lens, and a projection mirror for directing the focused light from the projection lens toward a screen.
    • 高架投影仪包括主体,设置在主体中用于发光的光源,设置在主体上表面的菲涅耳透镜,用于将发射的光反射到菲涅尔透镜的内反射镜,可旋转地 在主体中使得内镜的一部分在使用投影仪时从主体的底部突出到主体的外部,并且在不使用投影仪时被容纳在主体中, 在主体的一个纵向端与主体连接的臂,由臂的另一纵向端部保持的投影透镜,用于聚焦已经通过菲涅耳透镜的反射光和用于放置在菲涅耳透镜上的投影的原稿,以及 用于将来自投影透镜的聚焦光引导到屏幕的投影镜。