Lens drive device, image pickup device and lens drive method
First Claim
1. A lens drive device holding at least one lens moveably along an optical axis, the lens drive device comprising:
- a drive section to drive the lens;
an acceleration detection section to detect an acceleration; and
an output control section to control an output of the drive section corresponding to the acceleration detected by the acceleration detection section,wherein the drive section includes a motor to drive the lens, andthe output control section determines whether the acceleration detected by the acceleration detection section falls within a predetermined acceleration range or not, when the acceleration is determined to be within the range, a further determination of whether the lens drive device is in a stationary state is performed, and when it is determined not being in the stationary state, the motor is driven by a maximum drive voltage, while when it is determined being in the stationary state, a further determination of whether a posture is horizontal or not is performed, when being horizontal is determined, the motor is driven by a drive voltage appropriate for a horizontal posture, while when it is determined not being horizontal, a further determination is performed of whether to drive the motor in the gravity direction or in the direction opposite to the gravity direction, when it is determined to drive the motor in the gravity direction, the motor is driven by a lower voltage than the drive voltage appropriate for the horizontal posture, while when otherwise, the motor is driven by a voltage higher than the drive voltage appropriate for the horizontal posture and lower than the maximum drive voltage.
1 Assignment
0 Petitions
Accused Products
Abstract
A lens drive device in at least one lens barrel holding a lens moveably includes a motor to drive the lens; an acceleration detection section to detect an acceleration; and an output control section to control an output of the motor corresponding to the acceleration detected by the acceleration detection section. The output control section determines whether the acceleration detected by the acceleration detection section falls within a predetermined acceleration range or not. When the acceleration is determined to be within the range, a further determination of whether the lens drive device is in a stationary state is performed. When it is determined not being in the stationary state, the motor is driven by a maximum drive voltage. When it is determined being in the stationary state, a further determination of whether the posture is horizontal or not is performed.
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Citations
18 Claims
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1. A lens drive device holding at least one lens moveably along an optical axis, the lens drive device comprising:
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a drive section to drive the lens; an acceleration detection section to detect an acceleration; and an output control section to control an output of the drive section corresponding to the acceleration detected by the acceleration detection section, wherein the drive section includes a motor to drive the lens, and the output control section determines whether the acceleration detected by the acceleration detection section falls within a predetermined acceleration range or not, when the acceleration is determined to be within the range, a further determination of whether the lens drive device is in a stationary state is performed, and when it is determined not being in the stationary state, the motor is driven by a maximum drive voltage, while when it is determined being in the stationary state, a further determination of whether a posture is horizontal or not is performed, when being horizontal is determined, the motor is driven by a drive voltage appropriate for a horizontal posture, while when it is determined not being horizontal, a further determination is performed of whether to drive the motor in the gravity direction or in the direction opposite to the gravity direction, when it is determined to drive the motor in the gravity direction, the motor is driven by a lower voltage than the drive voltage appropriate for the horizontal posture, while when otherwise, the motor is driven by a voltage higher than the drive voltage appropriate for the horizontal posture and lower than the maximum drive voltage. - View Dependent Claims (2, 3, 4)
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5. An image pickup device comprising:
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a lens drive device holding at least one lens moveably along an optical axis, the lens drive device including a drive section to drive the lens, an acceleration detection section to detect an acceleration, and an output control section to control an output of the drive section corresponding to the acceleration detected by the acceleration detection section; and an imaging element circuit board, provided with an image pickup element to convert a subject image obtained by the lens into an electrical signal, wherein when the image pickup device is switched on, the acceleration detection is performed prior to the lens drive, and upon the detected acceleration exceeding a prescribed range, the lens drive is terminated, followed by a shift to a suspension state in which a photographing cannot be performed. - View Dependent Claims (6, 7, 8, 9, 10)
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11. A lens drive device holding at least one lens moveably along an optical axis, the lens drive device comprising:
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a drive section to drive the lens; acceleration detection section detect an acceleration; and an output control section to control an output of the drive section corresponding to the acceleration detected by the acceleration detection section, wherein the lens drive device includes; a lens position detection section to detect a position of the lens; an operating section to perform an input operation so as to operate the lens drive device; a drive direction discrimination section to discriminate a drive direction of the lens drive device, based on an input from the operating section and a lens position detection signal obtained from the lens position detection section; and
whereinthe output control section includes an acceleration discrimination section to discriminate an acceleration pattern among a first acceleration pattern in which the lens drive device is driven by a first output; a second acceleration pattern in which both an operation output for extension and an operation output for collapse are increased to be larger than the first output, based on an input from the operating section; a third acceleration pattern in which compared with the first output, the operation output for extension is decreased while the operation output for collapse is increased, based on the input from the operating section; and a fourth acceleration pattern in which compared with the first output, the operation output for extension is increased while the operation output for collapse is decreased, based on the input from the operating section; and the output control section controls the output of the lens drive device based on both a discriminated lens drive direction, obtained from the lens drive direction discrimination section, and a discriminated acceleration pattern obtained by the acceleration discrimination section. - View Dependent Claims (12, 13, 14, 15, 16)
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17. A method of driving at least one lens in a lens barrel holding the lens moveably by a motor, the method comprising:
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detecting an acceleration working on the lens; and controlling an output of the motor to select an optimum output of the motor corresponding to the detected acceleration;
whereinthe controlling of the output of the motor comprising; determining whether the acceleration detected by the acceleration detection section falls within a predetermined acceleration range or not, and then when the acceleration is determined to be within the range, further determining whether being in a stationary state or not; and
when it is determined not being in the stationary state, driving the motor with a maximum drive voltage;further determining whether being horizontal or not, based on the determination of being in the stationary state, and then when being horizontal is determined, driving the motor by a drive voltage appropriate for being horizontal; further determining whether to drive the motor in the gravity direction or in the direction opposite to the gravity direction, based on the determination of not being horizontal; driving the motor by a lower voltage than the drive voltage appropriate for being horizontal, based on the determination of driving the motor in the gravity direction; and driving the motor by a voltage higher than the drive voltage appropriate for being horizontal and lower than the maximum drive voltage, based on the determination of driving the motor in the direction opposite to the gravity direction. - View Dependent Claims (18)
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Specification