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:
May. 05, 2020
Filed:
Dec. 20, 2018
Acer Incorporated, New Taipei, TW;
ACER INCORPORATED, New Taipei, TW;
Abstract
An optical dial device includes a base and a drum. In the base, optical sensing elements are disposed at a predetermined height along the circumference of the side surface of the base. The drum covers the base in a manner that is movable and rotatable relative to the base. The drum includes an opening and a reflective structure disposed along the circumference of the inner wall surface of the drum and located a first distance away from the opening. There is a spiral structure disposed along the circumference of the inner wall surface of the drum and located a second distance away from the opening. The spiral structure causes the distance between the inner wall surface of the drum and the side surface of the base to vary continuously along the circumference.