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Focus detection apparatus and focus detection method

A technology of focus detection and equipment, applied in the direction of focusing devices, instruments, installations, etc., can solve problems such as long time and overlap of adjacent areas

Inactive Publication Date: 2009-11-18
CANON KK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, if the accumulation control area is large, adjacent areas overlap
Since accumulation control cannot be performed on overlapping areas at the same time, a re-accumulation operation is performed for each area, resulting in a longer time required for focus detection

Method used

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  • Focus detection apparatus and focus detection method
  • Focus detection apparatus and focus detection method
  • Focus detection apparatus and focus detection method

Examples

Experimental program
Comparison scheme
Effect test

no. 1 example

[0052] figure 1 is a block diagram showing the circuit configuration of the camera according to the first embodiment of the present invention. refer to figure 1 , the signal input circuit 204 of the switch group 214 for detecting various operations about the camera, the image sensor 206, the AE sensor 207, the shutter control circuit 208 for controlling the shutter magnets 218a and 218b, and the AF sensor 101 are connected to the camera microcomputer (hereinafter referred to as CPU) 100 . The CPU 100 sends a signal 215 to a photographing lens (to be described later) through the lens communication circuit 205 to control the focus position and aperture. The operation of the camera is determined by the setting of the switch group 214 .

[0053] The AF sensor 101 includes a pair of line sensors. The CPU 100 controls the AF sensor 101 to detect the defocus amount with the contrast distribution of the subject to be photographed obtained from the line sensor, thereby controlling ...

no. 2 example

[0090] In the focus detection apparatus according to the first embodiment explained above, when the area C is enlarged, the areas L and R are narrowed. As a result, the detection range of the defocus amount becomes narrow. Next, a technique for solving this problem will be described as a second embodiment of the present invention.

[0091] Figure 13 is a block diagram showing the configuration of a camera according to a second embodiment of the present invention. exist Figure 13 in, with figure 1 The same reference numerals denote the same parts.

[0092] The AF sensor 401 includes two pairs of line sensors. The CPU 100 includes a timer 400 for measuring the accumulation time in the AF sensor 401 . Other configurations and figure 1 The shown configurations are the same, so descriptions thereof are omitted.

[0093] refer to Figure 14 and 15 The relationship between the line sensor on the AF sensor 401 and the distance measurement points in the shooting frame will ...

no. 3 example

[0116] Next, a third embodiment of the present invention will be described. Figure 19 is a view showing the principle of distance measurement using the focus detection device according to the third embodiment of the present invention.

[0117] In the third embodiment, the photographing lens 603 is provided in front of the distance measuring unit 610 . It may be possible by changing the position of the photographing lens 603 between the subject 601 to be photographed and the distance measuring unit 610, more specifically, by Figure 19 in the vertical direction ( Figure 19 The direction indicated by the arrow in ) moves the shooting lens 603 to change the focus state. exist Figure 19 In the illustrated case, a one-line drawing board (a drawing board having one line) is used as the subject 601 .

[0118] The distance measurement unit 610 is provided with a field lens 611 , a diaphragm 612 , a secondary imaging spectacle lens 613 having two combined lenses, and a light rec...

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Abstract

This invention includes accumulation units (102a, 102b) which accumulate signals obtained by sensing units (111a, 111b), an area determination unit (103, 100) which sets the size of an area of a sensing unit to be segmented into a plurality of areas on the basis of the information of a lens to be focus-detected, accumulation control units (104a - 104c, 105) which control, for each of the areas, accumulation of signals obtained in a plurality of areas by the accumulation units, and a defocus detection unit (100) which detects defocus states in the respective areas from accumulated signals from a plurality of areas.

Description

[0001] (This application is a divisional application of an application with an application date of December 15, 2005, an application number of 200580044427.0, and an invention title of "focus detection device and focus detection method".) technical field [0002] The present invention relates to a focus detection device and a focus detection method for detecting a distance measurement position. Background technique [0003] Conventionally, as a focus detection device of a camera, a focus detection device based on a so-called phase difference detection scheme (Japanese Patent Laid-Open No. 09-054242) is known by making the phase difference from the subject pass through the shooting lens. The light beam in the aperture area forms an image on a pair of line sensors, and the offset between the relative positions of the pair of subject images obtained by photoelectrically converting the subject images is obtained (below This operation is called phase difference calculation) to de...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02B7/34G03B13/36
Inventor 一宫敬大塚正典
Owner CANON KK