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:
Jun. 07, 2005
Filed:
May. 15, 2002
Masahiko Igaki, Kanagawa, JP;
Yasushi Miura, Kanagawa, JP;
Manabu Takayama, Kanagawa, JP;
Canon Kabushiki Kaisha, Tokyo, JP;
Abstract
A rotary disc made of synthetic resin has a fixed portion fixed to a rotary shaft, a cylindrical portion extending in the thrust direction from the outer peripheral edge of the fixed portion, and a disc main body portion extending in the radial direction from the lower portion of the cylindrical portion, and a scale portion for detecting the rotation angle is disposed on the underside of the disc main body portion. Among the coefficient of thermal expansion αof the rotary disc, the coefficient of thermal expansionof the rotary shaft, the temperature characteristic factor β of a sensor head, the distance H between a mounting reference surface and the light condensing point of the sensor head in the thrust direction, the distance L from the fixed point of the rotary shaft and a bearing to the fixed point of the rotary shaft and the rotary disc in the thrust direction, the distance S between the fixed point and the scale portion for rotation angle detection in the thrust direction, and the amount of change ΔT of temperature, a relational expression β×H×ΔT=(LS)×ΔT and a relational expression L=H+S are established to thereby construct a rotation angle detecting apparatus which is hardly affected by any temperature change.