The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jan. 09, 2001
Filed:
Dec. 28, 1999
Mutsuo Kai, Nagoya, JP;
Kazuhiro Sukenari, Nagoya, JP;
Elmo Co., Ltd., Aichi, JP;
Abstract
An overhead projector of the under mirror type includes a projection head assembly supported on a column so as to be located over a stage on the top of a housing and so as to be pivotable between a standing position and a stowed position. A projection lens is fixed on a lens frame and a reflecting mirror is fixed on a mirror plate. Both the lens frame and the mirror plate are rotatably mounted on a single shaft further mounted on the head body of the projection head assembly so that angles of the lens and the mirror are increased and decreased. The lens frame is rotated by a self-weight of the lens in such a direction that the angle of the lens is decreased, when the projection head assembly assumes the standing position. A link lever interconnects the lens frame and the mirror plate so that the angles of them are adjusted so that the angle of the lens doubles that of the mirror. A mirror locking element locks the mirror at a position where the angle of the mirror is maximum. An angle adjusting knobbed bolt is mounted on the head body so as to be turnable and immovable back and forth. An angle adjusting piece is screwed in the knobbed bolt so as to be unturnable and movable back and forth. The mirror plate has an end departed from the angle adjusting piece when the mirror plate is rotated in such a direction that the angle of the mirror is increased. The end of the mirror plate engages the angle adjusting piece when the mirror frame is rotated in such a direction that the angle of the mirror is decreased.