Focus detection device, focus adjustment device and camera
A technology of focus detection and focus adjustment, which is applied in the direction of focus devices, focus devices, camera focus devices, etc., can solve the problems of inefficient focus adjustment and inaccuracy, and achieve the effect of accurate and effective focus adjustment
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no. 1 approach
[0038] figure 1 It is a sectional view showing an interchangeable lens camera system to which the present invention is applied. The camera 1 is composed of a camera body 100 and an interchangeable lens 200 that can be attached to and detached from the camera body 100 .
[0039] The interchangeable lens 200 is provided with a photographing optical system including a plurality of lenses 202 , 203 , and 204 and a diaphragm 205 having an opening. A light beam from a subject enters the camera body 100 through the photographic optical system and the opening of the diaphragm 205 . In addition, in figure 1 In FIG. 3 , the photographing optical system is constituted by three lenses, but the photographing optical system may be constituted by a plurality of lenses. In addition, in figure 1 In the figure, the diaphragm 205 is provided between the lens 203 and the lens 204, but as known, the diaphragm 205 may be located in front or rear of the photographing optical system, or may be lo...
no. 2 approach
[0096] The camera system of this embodiment has the same figure 1 The camera system of the first embodiment shown has the same structure. The only difference from the first embodiment lies in the focus detection processing performed by the body control device 101 . Hereinafter, regarding this embodiment, differences from the first embodiment will be mainly described, and descriptions of other parts will be omitted.
[0097] Figure 10 (a) shows a subject image 43a having vertical stripes in the vertical direction. The vertical stripes included in the subject image 43 a are arranged at intervals of T1 in the horizontal direction, constituting a periodic pattern. When the subject image 43a is formed at a position separated to some extent from the predetermined focal plane 17, it is formed on the light receiving surface of the light receiving element array 12. Figure 10 Periodic pattern shown in (b). The body control device 101 applies the above-mentioned pattern matching t...
Deformed example 1
[0116] exist image 3 In the above, the case where the five light receiving element groups 14 a to 14 e arranged in the lateral direction are selected for focus detection is exemplified, but the light receiving element group 14 arranged in a line in other directions may also be selected. In addition, more than five or less than five light-receiving element groups 14 may be selected, and continuous light-receiving element groups 14 do not necessarily have to be selected. For example, light receiving element groups 14 arranged every other can be selected.
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