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:
Apr. 12, 2022
Filed:
Jan. 24, 2019
Coretronic Corporation, Hsin-Chu, TW;
Chih-Chen Chen, Hsin-Chu, TW;
Coretronic Corporation, Hsin-Chu, TW;
Abstract
A projection apparatus is provided. A gear structure and a positioning piece in the projection lens module are disposed about opposite sides outside the lens barrel. The gear structure and the positioning piece rotates around an optical axis of the lens barrel acting as a rotating axis. Moreover, when the gear structure rotates, the positioning piece rotates relative to the gear structure. A transmission gear of the motor module meshes with the gear structure to drive the gear structure to rotate. The positioning module is disposed next to the positioning piece and is configured for measuring rotation of the positioning piece to generate a positioning signal. The controller controls the motor module to drive the transmission gear, receives the positioning signal, and calculates a backlash between the transmission gear and the gear structure according to the positioning signal. A backlash detecting system and a method thereof are provided.