Lens control device and lens control method
AssigneeOlympus Corporation
InventorYasunori Kudo
Life of this patent
Estimating the term…
Abstract
A lens control device, comprising a first stepping motor that drives a zoom lens contained in the photographing lens, a second stepping motor that drives a focus lens contained in the photographing lens, and a processor that controls the first stepping motor and the second stepping motor, whereby, within a given section in which the zoom lens and the focus lens are driven, there is a period in which at least one of the first stepping motor and the second stepping motor is driven at a constant rate, and the processor makes a time, required to move the specified section with a specified number of pulses, a specified time.
Claims22
A lens control device having a photographing lens that is capable of zoom and focus, comprising:
- a first stepping motor that drives a zoom lens contained in the photographing lens;
- a second stepping motor that drives a focus lens contained in the photographing lens;
- and
- a processor that is capable of setting drive times in accordance with a specified control unit time for each of respective drive pulses of the first stepping motor and the second stepping motor, and that controls the first stepping motor and the second stepping motor, whereby
- within a given section in which the zoom lens and the focus lens are driven, there is a period in which at least one of the first stepping motor and the second stepping motor is driven at a constant rate, and
- the processor, in order to make a time, required to drive at least one of the first stepping motor and the second stepping motor by a specified number of drive pulses during the period in which there is drive at the constant rate, match a specified time,
- when a drive time per one drive pulse, that has been derived by dividing drive time for all drive pulses of a period in which there is drive at the constant rate by the specified number of drive pulses, is made average drive time,
- divides the period in which there is drive at the constant rate into a plurality of per ids, calculates two of the drive times that are different from each other by the control unit time, on either side of the average drive time, and sets one of the two drive times, that are different from each other by the control unit time, as a drive time for every drive pulse of the plurality of periods.
A lens control method for an imaging device that comprises a photographing lens that is capable of zoom and focus, a first stepping motor that drives a zoom lens contained in the photographing lens, and a second stepping motor that drives a focus lens contained in the photographing lens, comprising:
- being able to set drive times in accordance with a specified control unit time tor each of respective drive pulse of the first stepping motor and the second stepping motor, and, when controlling the first stepping motor and the second stepping motor,
- within a given section in which the zoom lens and the focus lens are driven, having a period in which at least one of the first stepping motor and the second stepping motor is driven at a constant rate, and,
- in order to make a time, required to drive at least one of the first stepping motor and the second stepping motor by a specified number of drive pulses during the period in which there is drive at the constant rate, match a specified time,
- when a drive time per one drive pulse, that has been derived by dividing drive time for all drive pulses of a period in which there is drive at the constant rate by the specified number of drive pulses, is made average drive time,
- dividing the period in which there is drive at the constant rate into a plurality of periods, calculating two of the drive times that are different from each other by the control unit time, on either side of the average drive time, and setting one of the two drive times, that are different from each other by the control unit time, as a drive time for every drive pulse of the plurality of periods.
A non-transitory computer-readable medium storing a processor executable code, which when executed by at least one processor, this processor belong provided in an imaging device that comprises a photographing lens that is capable of zoom and focus, a first stepping motor that drives a zoom lens contained in the photographing lens, and a second stepping motor that drives a focus lens contained in the photographing lens, performs a lens control method, the lens control method comprising:
- being able to set drive times in accordance with specified control unit time for each of respective drive pulse of the first stepping motor and the second stepping motor, and, when controlling the first stepping motor and the second stepping motor,
- within a given section in which the zoom lens and the focus len:
- are driven, having a period in which at least one of the first stepping motor and the second stepping motor is driven at a constant rate, and,
- in order to make a time, required to drive at least one or the first stepping motor and the second stepping motor by a specified number of drive pulses during the period in which there is drive at the constant rate, match a specified time,
- when a drive time per one drive pulse, that has been derived by dividing drive time for all drive pulses of a period in which there is drive at the constant rate by the specified number of drive, is made average drive time,
- dividing the period in which there is drive at the constant rate into a plurality of periods, calculating two of the drive times that are different from each other by the control unit time, on either side of the average drive time, and setting one of the two drive times, that are different from each other by the control unit time, as a drive time for every-drive pulse of the plurality of periods.
Dependencies are inferred from the claim text.