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. 03, 2012
Filed:
Dec. 08, 2009
Tetuo Kudo, Sayama, JP;
Tetuo Kudo, Sayama, JP;
Nihon Dempa Kogyo Co., Ltd., Tokyo, JP;
Abstract
An object of the invention is to provide an oven controlled crystal oscillator that prevents a reduction in characteristics due to temperature rise in the crystal vibrator and circuit elements other than the oscillating stage, and that increases energy efficiency of a heater element, to thereby facilitate temperature control. The oven controlled crystal oscillator of the invention is an oven controlled multistage crystal oscillator provided with: a crystal vibrator; circuit elements of an oscillating stage, a buffering stage, and a temperature control circuit; and first, second, and third circuit substrates, wherein the configuration is such that: on the first circuit substrate or the second circuit substrate, there are arranged the heater element and the circuit element of the oscillating stage thermally bonded to the heater element; on the third circuit substrate, there are arranged the circuit element of the buffering stage, and at least the circuit elements of the temperature control circuit excluding the heater element and the temperature sensor element; and the third circuit substrate is distanced in the vertical direction and thermally isolated, with a clearance, from the first and second circuit substrates.