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Camera and focus detection device

A focus detection and camera technology, applied in the direction of cameras, focusing devices, installation, etc., can solve the problems of increased cost, increased memory capacity, large-scale processing circuit in the camera, etc., achieves high-precision focus offset correction, and simplifies the correction method. Effect

Inactive Publication Date: 2005-07-27
OLYMPUS CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] However, the device described in Patent Document 2 performs complex calculations based on chromatic aberration correction data of a specific wavelength relative to a reference wavelength and the main color of the subject light measured by a colorimetric unit that measures the color of the subject light. Calculate the correction value
Therefore, there is a problem that the memory capacity in the interchangeable lens is increased, and the processing circuit in the camera is enlarged, resulting in an increase in cost.

Method used

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  • Camera and focus detection device

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no. 1 Embodiment approach

[0056] figure 2 It is a perspective view schematically showing the internal structure of the digital camera according to the first embodiment of the present invention when it is cut away.

[0057] exist figure 2 Among them, the digital camera 10 of the present embodiment includes a camera body 11 and a lens barrel 12 which are independently configured, and the camera body 11 and the lens barrel 12 are mutually detachably detachable.

[0058] The above-mentioned lens barrel 12 has a structure in which a photographic optical system 12a composed of a plurality of photographic lenses, their drive mechanisms, and the like is held inside. The imaging optical system 12a is composed of, for example, a plurality of optical lenses, etc., transmits light beams from the subject, and images the subject image formed by the subject light beams at a predetermined position (the image sensor 40 described later). on the photoelectric conversion surface). And, the lens barrel 12 is arranged ...

no. 2 Embodiment approach

[0205] Next, a second embodiment of the present invention will be described.

[0206] In the above-mentioned first embodiment, the case where any one of the light source types is selected was taken as an example, but in reality, when shooting near a window in a fluorescent lamp room, there are many shooting situations where there are multiple light sources. In the second embodiment described below, even when a plurality of light sources are mixed, an appropriate exposure amount can be obtained.

[0207] In addition, this second embodiment is different from the above-mentioned first embodiment only in the control operation, and the structure and basic operation of the camera are basically the same as those of the first embodiment. Figure 1 to Figure 14 The ones shown are the same, therefore, the same parts are given the same reference numerals, and their illustrations and descriptions are omitted.

[0208] First, refer to Figure 16 , the calculation of the correction amount...

no. 3 Embodiment approach

[0238] Next, a third embodiment of the present invention will be described.

[0239] This third embodiment is an example in which the correction of the subject distance is added.

[0240] It is well known that the focal length offset produced by the light source varies with the position of the focusing lens. It is also well known that spherical aberration varies due to the position of the focusing lens, that is, the extension of the focusing lens (see Figure 19 ).

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Abstract

The object of the invention is to reduce the cost of an interchangeable lense, camera or the like by simplifying a correction method thereby downsizing a memory and a processing circuit, and to provide the camera and a focus detecting device which can correct the out of focusing highly precisely. When a light source illuminating a subject is detected by a light source detection part 4 in a camera body 1, a signal corresponding to the light source is outputted from the light source detection part 4. In addition, a correction value for correcting defocus according to the type of the light source, which is stored in a memory 3, is read as correction data. Based upon the signal from the light source detection part 4 and the correction data read from the memory 3, an AF control part 5 performs the focus detection.

Description

technical field [0001] The present invention relates to a camera and a focus detection device, and more particularly to a focus detection device for a camera that corrects the focus point position based on a light source incident on the photographic lens in order to reduce the influence of chromatic aberration of the photographic lens or the like. Background technique [0002] Conventionally, a technology has been developed to detect the brightness of the subject and the background light during shooting, and to perform correction at the time of distance measurement. For example, the so-called Phase Difference AF (Automatic Adjustment AF) that detects the focus state of the measurement object from the positional relationship of a pair of images formed on a pair of light-receiving element rows, and performs focus adjustment of the photographing lens based on the detection result. Focus) automatic focus adjustment device (for example, refer to Patent Document 1). [0003] In s...

Claims

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Application Information

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IPC IPC(8): G03B13/36G02B7/28G02B17/02
Inventor 井出昌孝
Owner OLYMPUS CORP
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