US 4,165,161 A · Multiple optics slide projector

Abstract

The projector includes two projection optics systems and two slide gates which move slides acquired from a slide receptacle into and out of a viewing position in all of the projection optics systems. The slide gates are movable between a first position, which is common to both slide gates and in which slides are moved between the slide receptacle and the side gate means, and the second position in one of the projection optics systems. The slides move by gravity from the slide receptacle into the slide gates and by means of a slide lifter from the slide gates back into the slide receptacle. A combination of a scalloped gear matching the depending lugs on the slide receptacle and a stepping motor to control the movement of the gear provides efficient and economical control over the movement of the slide receptacle. The slide gates, the slide lifter, and the slide receptacle gearing are independent of each other in operation, so that they may be activated in any sequence.

Claims27

Dependent claims

In a multiple optics projection slide projector, an apparatus for moving slides stored in a slide receptacle into and out of either of at least two projection optics systems, comprising:

first and second slide gate means for holding slides, each slide gate means being movable between a first position in which slides are acquired and released, and a second position in which acquired slides are projected onto a screen or the like;
and
first and second means for rotating, respectively, said first and second slide gate means between said first and second positions about axes which are parallel to the plane of the slides in said second position.

A multiple projection optics slide projector, which is adapted to receive a slide receptacle having a plurality of individual compartments in which slides may be positioned, comprising:

means for supporting the slide receptacle;
first and second projection optics systems for projecting slides onto a screen or the like for viewing;
first and second slide gate means for holding slides, each slide gate means being movable between a first position in which slides are acquired and released, and a second position, which is one of said projection optics systems, in which acquired slides are projected onto the screen;
first and second means for rotating, respectively, said first and second slide gate means between said first and second positions about axes which are parallel to the plane of the slides in said second position;
means for moving a slide from said slide gate means to the slide receptacle when said slide gate means is in said first position;
and
means for moving the slide receptacle in such a manner that each compartment in the receptacle may be uniquely addressed,
said first and second slide gate means, said slide moving means, and said slide receptacle moving means being constructed to be independently operable, so that they may be actuated independently in any desired sequence.

5 more elements

Dependencies are inferred from the claim text.

Multiple optics slide projector

Life of this patent

Multiple optics slide projector

Life of this patent

Abstract

Claims27