Endoscope device

An endoscope and lens technology, applied in the field of endoscope devices with automatic focusing function, can solve the problems of image quality degradation, narrow depth of field, etc., and achieve the effect of improving the accuracy of automatic focusing and high-precision focusing
CN105682531AActive Publication Date: 2016-06-15OLYMPUS CORP
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Patent Information

Authority / Receiving Office
CN Β· China
Patent Type
Applications(China)
Current Assignee / Owner
OLYMPUS CORP
Publication Date
2016-06-15

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Abstract

An objective of the present invention is to allow simplification of an assessment of a determination of a direction of movement of a focusing lens, and to improve auto-focusing precision. Provided is an endoscope device, comprising: an optical assembly (14), further comprising a focusing lens (14a); a lens drive means (15) for moving the focusing lens in the optical axis direction and switching the observation depth; an image capture means (17) for acquiring optical images of a subject via the optical assembly as a plurality of images with respectively different focal locations; a movement direction determination means (31) for assessing, on the basis of the plurality of images, whether it is necessary to switch the observation depth, and if it is assessed that it is necessary to switch the observation depth, for determining the direction of movement of the focusing lens on the basis of the images; and a drive control means (27) for controlling the lens drive means to move the focusing lens in the determined direction of movement.
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Description

technical field

[0001] The invention relates to an endoscope device, in particular to an endoscope device with an automatic focusing function. Background technique

[0002] Conventionally, in an endoscope device, an imaging element with a low number of pixels is used for downsizing the device, and an image with a sufficiently wide depth of field can be acquired only by reducing the aperture of the optical system.

[0003] In recent years, the finer pixelation of imaging elements has progressed, and more detailed observation and diagnosis can be performed by applying imaging elements with a large number of pixels to endoscope devices. In such an endoscope device, when the aperture of the optical system is stopped down too much in order to ensure the depth of field, the image quality of the acquired image is degraded due to diffraction limit. On the other hand, when the aperture cannot be stopped down, the depth of field becomes narrow. Therefore, various endoscope apparatus...

Claims

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