Foldable optical apparatus

Details Foldable optical apparatus Foldable optical apparatus

1993-03-23

1994-09-06

Cuchlinski, Jr., William A.

Optics: image projectors

Housing

353 63, G03B 2114

Patent

active

053452828

ABSTRACT:
An optical apparatus, e.g. a foldable overhead projector of the reflection type, includes a base table, whereon original material is placed on a Fresnel mirror. A projector head forms an image of the original material. A stand is swung on the base table. The stand, when folded, overlies a control portion of the Fresnel mirror. The projector head is vertically swingable on a distal end of the stand. A stand locking lid is swingably mounted on the stand distal end. Retaining claws are formed at a front of the locking lid. Receiving recesses in the base table retain the retaining claws, and keep the stand folded. The locking lid has a manually pullable edge, which is pulled to disengage the retaining claws from the receiving recesses. The projector is thus erected and folded easily, because it is openable quickly for erection. A pair of plates are swingable beside the base table between open and closed positions, to cover lateral margins of the Fresnel mirror when closed, and lie flush with the Fresnel mirror when opened. A storage chamber in the base table contains a plurality of original materials, and is covered by the vertically swingable Fresnel mirror. Two rollers under the base table and close to a front edge facilitate transportation of the base table as raised in a position opposite to the rollers.

REFERENCES:
patent: 2944461 (1960-07-01), Howell et al.
patent: 4588271 (1986-05-01), Emura
patent: 4921343 (1990-05-01), Ushiro et al.
patent: 4938587 (1990-07-01), Namioka et al.

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