US Patent No. 10,141,887


Patent No. 10,141,887
Issue Date November 27, 2018
Title Oscillator For Detecting Temperature Of Atmosphere
Inventorship Kazuo Akaike, Saitama (JP)
Tsukasa Kobata, Saitama (JP)
Tomoya Yorita, Saitama (JP)
Assignee NIHON DEMPA KOGYO CO., LTD., Tokyo (JP)

Claim of US Patent No. 10,141,887

1. An oscillator that detects a temperature of an atmosphere where a crystal resonator providing an oscillation output is placed using a temperature detector to stabilize the temperature by controlling a temperature of a heater based on a temperature detection value, the oscillator comprising:a buffer amplifier interposed in a signal path of a control signal generated based on the temperature detection value;
a heater constituted of a transistor having a collector and an emitter positioned between a power source unit and a ground, and a base connected to an output port of the buffer amplifier; and
a first differential amplifier disposed to adjust a gain of the buffer amplifier so as to cancel a voltage fluctuation of the power source unit, the first differential amplifier amplifying a difference between a voltage corresponding to a voltage of the power source unit and a preliminarily set voltage to input to a gain adjustment port of the buffer amplifier.