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:
Nov. 02, 2021
Filed:
May. 16, 2017
Interchip Co., Ltd., Shiroi, JP;
Masaaki Kamiya, Shiroi, JP;
Ryuji Ariyoshi, Shiroi, JP;
Interchip Co., Ltd., Shiroi, JP;
Abstract
To provide an oven controlled crystal oscillator which can keep constant the temperature of a quartz resonator housed within a thermostatic oven, thereby ensuring stable operation of the quartz resonator. An oven controlled crystal oscillator has a control system for exercising control so that the temperature of a quartz resonator becomes a target temperature Ttarg of a predetermined fixed value. The quartz resonator is housed within a thermostatic oven which is configured to compare a set temperature Tr and a measured temperature Tic based on an outside air temperature measured by a temperature sensor and which is controlled so that a difference between both temperatures is narrowed. The quartz resonator has characteristics influenced by an environmental temperature. The control system adds a predetermined feedback amount δT to the target temperature Ttarg of the fixed value to generate a new set temperature Tr for comparison with the measured temperature Tic so that when the measured temperature Tic lowers, the set temperature Tr becomes high, or when the measured temperature Tic rises, the set temperature Tr becomes low.