Back to results
US 5,854,428 AGranted
Vibration gyroscope
AssigneeMurata Manufacturing Co., Ltd.
InventorKenjiro Okaguchi
Life of this patent
Estimating the term…
Abstract
A vibration gyroscope having stable sensitivity characteristic against temperature change has an amplifier circuit which amplifies a detection signal derived from a piezoelectric vibrator. The amplifier circuit includes an input terminal, an operational amplifier having a non-inversion input connected to the input terminal and an inversion input which is grounded, an output terminal connected to the output of the operation amplifier, a first temperature-sensitive element connected between the non-inversion input of the operation amplifier and the ground, and a second temperature-sensitive element connected between the inversion input of the operational amplifier and the output of the same.
Claims10
A vibration gyroscope, comprising:
- a piezoelectric vibrator which generates a detection signal which varies with temperature;
- and
- an amplifier circuit which amplifies a detection signal derived from said piezoelectric vibrator;
- said amplifier circuit including an operational amplifier and at least two temperature-sensitive elements which are arranged in a circuit with said operational amplifier such that the amplification factor of said operational amplifier varies inversely to the variation in the detection signal caused by a change in temperature, said amplifier circuit further including an input terminal which is connected to an inversion input of said operational amplifier, a non-inversion input of said operational amplifier being grounded;
- and an output terminal connected to an output of said operation amplifier;
- and
- wherein said at least two temperature-sensitive elements include a first temperature-sensitive element connected between the inversion input of said operation amplifier and the output of said operation amplifier, and a second temperature-sensitive element connected between said output of said operation amplifier and the ground.
4 more elements
A vibration gyroscope, comprising:
- a piezoelectric vibrator which generates a detection signal which varies with temperature;
- and
- an amplifier circuit which amplifies a detection signal derived from said piezoelectric vibrator;
- said amplifier circuit including an operational amplifier and at least two temperature-sensitive elements which are arranged in a circuit with said operational amplifier such that the amplification factor of said operational amplifier varies inversely to the variation in the detection signal caused by a change in temperature, said amplifier circuit further including an input terminal which is connected to the inversion input of said operational amplifier, the non-inversion input of said operational amplifier being grounded;
- and an output terminal connected to the output of said operational amplifier;
- and
- wherein said at least two temperature-sensitive elements include a first temperature-sensitive element connected between said input terminal and the inversion input of said operational amplifier, and a second temperature-sensitive element connected between said inversion input of said operational amplifier and said output of said operational amplifier.
4 more elements
A vibration gyroscope comprising:
- a piezoelectric vibrator which generates a detection signal which varies with temperature;
- and
- an amplifier circuit which amplifies a detection signal derived from said piezoelectric vibrator;
- said amplifier circuit including:
- an operational amplifier having an inversion input, non-inversion input and output;
- a series circuit of a first resistor and a first thermistor, connected between the inversion input and a ground potential;
- a second resistor connected in parallel with the first thermistor;
- a series circuit of a third resistor and a second thermistor, connected between the output and the inversion input;
- a fourth resistor connected in parallel with the second thermistor;
- and input terminal connected to the non-inversion input;
- and an output terminal connected to the output of the operational amplifier.
8 more elements
A vibration gyroscope comprising:
- a piezoelectric vibrator which generates a detection signal which varies with temperature;
- and
- an amplifier circuit which amplifies a detection signal derived from said piezoelectric vibrator;
- said amplifier circuit including:
- an operational amplifier having an inversion input, non-inversion input and output;
- a series circuit of a first resistor, a first thermistor and a second resistor, connected between the inversion input and the output;
- a third resistor connected in parallel with the first thermistor;
- a series circuit of a fourth resistor and a second thermistor, connected between the inversion input and a connection point of the second resistor and the first thermistor;
- a first resistor connected in parallel with the second thermistor;
- an input terminal connected to the inversion input;
- and an output terminal connected to the output of the operational amplifier.
8 more elements
Dependencies are inferred from the claim text.