Image stabilization control circuit and imaging device having image stabilization control circuit
View Patent ↗A image stabilization control circuit is provided which comprises at least one analog-to-digital converter circuit which converts an output signal of a vibration detection element which detects vibration of an imaging device and an output signal of a position detection element which detects a position of an optical component, into digital signals, and a logic circuit which generates a control signal which drives the optical component based on the output signal of the vibration detection element which is digitized by the analog-to-digital converter circuit and the output signal of the position detection element which is digitized by the analog-to-digital converter circuit, wherein an abnormality of the vibration detection element is judged based on an amplitude of the output signal from the vibration detection element which is converted into the digital signal by the analog-to-digital converter circuit.
1. A image stabilization control circuit which drives an optical component or an imaging element of an imaging device according to vibration and which reduces an influence of the vibration on imaging, the image stabilization control circuit comprising:
at least one analog-to-digital converter circuit which converts an output signal of a vibration detection element which detects vibration of the imaging device into a digital signal; and
a logic circuit which generates a control signal which drives the optical component or the imaging element, based on the output signal of the vibration detection element which is digitized by the analog-to-digital converter circuit, the logic circuit comprising:
a pan and tilt judgment circuit which judges a pan operation or a tilt operation of the imaging device;
a gain adjustment circuit which adjusts, during imaging, a gain value which amplifies the output signal from the vibration detection element according to a judgment result of the pan and tilt judgment circuit and sets, when the vibration detection element is abnormal, a predetermined value as the gain value which amplifies the output signal from the vibration detection element, regardless of the judgment result of the pan and tilt judgment circuit;
a judgment circuit which judges that, if an output value of the vibration detection element obtained when the imaging device is static is not within a normal value range, the vibration detection element is abnormal, based on an amplitude of a signal obtained by amplifying, with the gain value, the output signal from the vibration detection element which is converted to the digital signal by the analog-to-digital converter circuit.
2. The image stabilization control circuit according to claim 1 , wherein
the logic circuit receives the output signal from the vibration detection element which is digitized by the analog-to-digital converter circuit and outputs only a signal of greater than or equal to a first frequency to the gain adjustment circuit, during the imaging, and
the logic circuit further comprises a high-pass filter which outputs, to the gain adjustment circuit, only a signal of greater than or equal to a second frequency which is lower than the first frequency, of the output signal from the vibration detection element which is digitized by the analog-to-digital converter circuit, during the abnormality judgment of the vibration detection element.
3. The image stabilization control circuit according to claim 2 , wherein
the vibration detection element is judged as being abnormal when the amplitude of the output signal from the vibration detection element is less than or equal to a first threshold value or is greater than or equal to a second threshold value which is greater than the first threshold value.
4. The image stabilization control circuit according to claim 2 , wherein
the abnormality of the vibration detection element is judged based on the amplitude of the output signal which is obtained by amplifying the output signal of the vibration detection element with a gain value which is greater than that during the imaging.
5. The image stabilization control circuit according to claim 1 , wherein
the vibration detection element is judged as being abnormal when the amplitude of the output signal from the vibration detection element is less than or equal to a first threshold value or is greater than or equal to a second threshold value which is greater than the first threshold value.
6. The image stabilization control circuit according to claim 1 , wherein
the vibration detection element is judged as being abnormal when the amplitude of the output signal from the vibration detection element is less than or equal to a first threshold value or is greater than or equal to a second threshold value which is greater than the first threshold value.
7. The image stabilization control circuit according to claim 1 , wherein
the abnormality of the vibration detection element is judged based on the amplitude of the output signal which is obtained by amplifying the output signal of the vibration detection element with a gain value which is greater than that during the imaging.
8. The image stabilization control circuit according to claim 1 , wherein
the abnormality of the vibration detection element is judged based on the amplitude of the output signal which is obtained by amplifying the output signal of the vibration detection element with a gain value which is greater than that during the imaging.
9. An imaging device comprising the image stabilization control circuit according to claim 1 , comprising:
the vibration detection element; and
a driving element which is connected to the image stabilization control circuit and which drives the optical component or the imaging element according to the control signal.