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OPTICAL PROJECTION DEVICE

  • US 3,744,892 A
  • Filed: 04/08/1971
  • Issued: 07/10/1973
  • Est. Priority Date: 04/15/1970
  • Status: Expired due to Term
First Claim
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1. An optical projection device combining an episcope and an overhead projector, comprising a casing having a light source therein, a projection lens system mounted on the casing and an overhead lens system supported by the casing, wherein the overhead projector is formed by a substantially transparent carrier adapted to receive information to be projected and a lens forming a surface of said casing and arranged to support said transparent carrier and to project light from the light source through the carrier towards said overhead lens system so as to form an image on a screen, and the episcope is formed by a removable support adjacent said lens for receiving an opaque information-bearing medium, said light source comprising two lamps, one of said lamps being disposed centrally under the transparent carrier for projecting said transparent carrier to said overhead lens system and the other being disposed to flood said support with light, said support being disposed between said one lamp and said lens, and a mirrored member having a flat mirror surface pivotally mounted for movement to a position intermediate said one lamp and said support, said flat mirror surface in said intermediate position reflecting the image of said opaque information-bearing medium into said projection lens system.

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