JP2007293026A5 - - Google Patents

Claims (8)

While moving the focus lens along the optical axis, to obtain an evaluation value indicating the level of the high-frequency component of the signal obtained from the imaging means for capturing an object image, performs focus adjustment of the focus lens in accordance with the evaluation values In automatic focusing device,
When the first reversal condition for decreasing the evaluation value is satisfied, the moving direction of the focus lens is reversed , and then a second value indicating whether or not the variation amount of the evaluation value is equal to or greater than a predetermined value. Control means for determining whether to further reverse the moving direction of the focus lens based on a reversal condition of the focus lens and an elapsed time after reversing the moving direction of the focus lens apparatus. The control means further reverses the moving direction of the focus lens when the fluctuation amount of the evaluation value is less than the predetermined value and the elapsed time is equal to or longer than a predetermined set time. The automatic focusing apparatus according to claim 1. 2. The autofocus according to claim 1, wherein the control unit further reverses the moving direction of the focus lens regardless of the elapsed time when the fluctuation amount of the evaluation value is equal to or greater than the predetermined value. Adjusting device. 4. The automatic focus adjustment apparatus according to claim 2 , wherein the control unit changes the set time according to a state of a focal depth of the imaging apparatus. When the imaging device is instructed to shoot a still image, the control unit moves the focus lens to a position where the evaluation value reaches a peak during movement of the focus lens, and a variation amount with respect to the peak of the evaluation value is when a predetermined set amount larger displays to the effect that is focus, when the amount of fluctuation with respect to the peak of the evaluation value is less than the set amount 1 to claim, characterized in that displays that it is defocused 4. The automatic focusing apparatus according to any one of 4 above. An imaging apparatus comprising the automatic focus adjustment apparatus according to any one of claims 1 to 5 . While moving the focus lens along the optical axis, to obtain an evaluation value indicating the level of the high-frequency component of the signal obtained from the imaging means for capturing an object image, performs focus adjustment of the focus lens in accordance with the evaluation values In the control method of the automatic focusing device,
When the first reversal condition for decreasing the evaluation value is satisfied, the moving direction of the focus lens is reversed , and then a second value indicating whether or not the variation amount of the evaluation value is equal to or greater than a predetermined value. And determining whether or not to further reverse the moving direction of the focus lens based on the reversing condition and the elapsed time after the moving direction of the focus lens is reversed . While moving the focus lens along the optical axis, an evaluation value indicating the level of the high frequency component of the signal obtained from the imaging means for capturing the subject image is obtained, and the focus of the focus lens is adjusted according to the evaluation value. In a program for controlling an automatic focusing device,
A computer included in the automatic focus adjustment device,
If the first reversal condition for decreasing the evaluation value is satisfied, the moving direction of the focus lens is reversed , and then a second value indicating whether or not the variation amount of the evaluation value is equal to or greater than a predetermined value. A program for executing a module for deciding whether or not to further reverse the moving direction of the focus lens based on the reversing condition and the elapsed time after reversing the moving direction of the focus lens .