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Focus adjustment device and focus adjustment method

A technology of focus adjustment and focus detection, which is applied in installation, instrument, TV, etc.

Inactive Publication Date: 2017-08-04
OLYMPUS CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] On the other hand, in the contrast AF method, in a scene where there are subjects mixed with far and near, the focus lens may focus on a subject different from the target subject

Method used

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  • Focus adjustment device and focus adjustment method
  • Focus adjustment device and focus adjustment method
  • Focus adjustment device and focus adjustment method

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Experimental program
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Embodiment Construction

[0042] Hereinafter, embodiments of the present invention will be described with reference to the drawings. figure 1 It is a block diagram showing the configuration of an example of an imaging device that is an application example of the focus adjustment device according to one embodiment of the present invention. Imaging devices include various imaging devices having focusing lenses, in addition to devices such as digital cameras and smartphones.

[0043] Such as figure 1 As shown, the imaging device 100 has a photographing lens 102, a focus adjustment mechanism 104, an aperture 106, an aperture driving mechanism 108, a shutter 110, a shutter driving mechanism 112, an imaging element 114, an imaging element interface (IF) circuit 116, a RAM 118, and a display element 120 , a display element drive circuit 122 , a touch panel 124 , a touch panel drive circuit 126 , a recording medium 128 , a system controller 130 , an operation unit 132 , a flash memory 134 , and a gyro sensor ...

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PUM

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Abstract

A direction judgment unit calculates a first evaluation value based on an image signal of a first focus detection region among focus detection regions to judge a drive direction of a focus lens to be in focus and calculates a second evaluation value based on an image signal of at least one second focus detection region smaller than the first region, the focus detection regions being at least partly the same and being different in size. A control unit determines whether a change of the second evaluation value is a monotonous change when the focus lens is slightly driven a first number of times in a first direction judged on the basis of the first evaluation value and the focus lens is slightly driven a second number of times smaller than the first number of times in a second direction opposite to the first direction, and the control unit performs focus adjustment on the basis of the second evaluation value when the change of the second evaluation value is not a monotonous change.

Description

technical field [0001] The invention relates to a focus adjustment device and a focus adjustment method. Background technique [0002] A contrast AF method is known as an automatic focus adjustment technique for a photographic lens included in an imaging device. The contrast AF method is a method of performing focus adjustment of a focus lens based on an evaluation value calculated based on an image signal generated from a light beam received by an imaging element via a photographing lens. In the contrast AF method, in order to determine the driving direction of the focus lens toward focus, for example, vibration driving is performed. Vibration drive is a technology that drives the focusing lens slightly toward the closest and infinity directions, and compares the evaluation values ​​when driving toward the closest direction and when driving toward infinity to determine the driving direction toward the focusing lens that achieves focus. [0003] On the other hand, in the c...

Claims

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Application Information

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IPC IPC(8): H04N5/232
CPCH04N23/673G02B7/28G02B7/38G02B7/09H04N23/73G02B7/34G02B7/36
Inventor 宫泽慎吾池田诚
Owner OLYMPUS CORP