US Patent No. 9,306,578


Patent No. 9,306,578
Issue Date April 05, 2016
Title Oscillator
Inventorship Hiroki Kimura, Saitama (JP)
Naoki Onishi, Saitama (JP)
Assignee NIHON DEMPA KOGYO CO., LTD., Tokyo (JP)

Claim of US Patent No. 9,306,578

1. An oscillator, comprising:
an oscillator circuit, being configured to output an oscillation signal;
a crystal filter, having a frequency characteristic where an attenuation at a detuned frequency is larger than an attenuation
at an oscillation frequency of the oscillation signal, and the detuned frequency being a frequency different from the oscillation

a package portion that covers a crystal blank of the oscillator circuit and a crystal blank of the crystal filter; and
a heating portion, being configured to heat the crystal blank of the oscillator circuit and the crystal blank of the crystal
filter by using a resistor disposed between a wiring board to which the package portion is secured, and the package portion,

wherein the heating portion includes:
a heat generating portion, being configured to generate heat; and
an adjustment portion, being configured to control ambient temperatures of the oscillator circuit and the crystal filter corresponding
to heat generation of the heat generating portion, wherein

the package portion is heated by transfer of heat generated by the heat generating portion of the heating portion.