Vibration-type angular rate sensor
AssigneeDenso Corporation
InventorTameharu Ohta
Life of this patent
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Abstract
An angular rate sensor includes a sensor chip having an oscillator vibrating at a predetermined frequency and detecting an angular velocity applied to this oscillator around a predetermined rotation axis. A circuit chip, laminated with the sensor chip, has a circuit formed on a surface thereof to detect the angular velocity based on a signal obtained from the sensor chip. The sensor chip and the circuit chip are bonded with an adhesive film. A resonance frequency of the sensor chip is smaller than (½)1/2 times a driving frequency of the oscillator in a condition that adjustment is applied to at least one of configuration or elastic coefficient of the adhesive film.
Claims9
An angular rate sensor comprising:
- a sensor chip having a first area and a predetermined rotation axis that is set at a center of the first area, having an oscillator that is driven to vibrate at a predetermined frequency, and being configured to detect an angular velocity applied to the oscillator around the predetermined rotation axis and output an angular velocity signal indicating the detected angular velocity;
- a circuit chip having a second area facing the sensor chip and being configured to receive the angular velocity signal and extract the detected angular velocity from the angular velocity signal, the second area being larger than the first area;
- and
- an adhesive film placed between the sensor chip and the circuit chip to connect the first and second areas to each other, configured to have a plurality of adhesive film portions that are i) located so as to be formed across the peripheral edges of the first area, ii) located symmetrically about the predetermined rotation axis, and iii) spaced away from the predetermined rotation axis,
- wherein at least one of shapes and elastic coefficients of the adhesive film portions are set to allow the sensor chip to maintain a resonance frequency smaller than a driving frequency of the oscillator.
Dependencies are inferred from the claim text.