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Focus control device, endoscope device and focus control method

A technology of focus control and focus control unit, applied to endoscopes, focusing devices, installations, etc., can solve problems such as narrowing depth of field, increasing image position movement, and difficult focus

Active Publication Date: 2017-02-15
OLYMPUS CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] On the other hand, when the optimal subject distance is shortened, the amount of movement of the image position due to movement of the subject position increases, so the depth of field usually becomes narrow
Therefore, in recent endoscope devices with a zoom function, the depth of field width on the TELE side may be 1 mm or less (including this value), making it difficult for the user to focus on the subject.

Method used

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  • Focus control device, endoscope device and focus control method
  • Focus control device, endoscope device and focus control method
  • Focus control device, endoscope device and focus control method

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no. 2 Embodiment approach

[0080] Next, an endoscope system according to a second embodiment of the present invention will be described. Figure 8 It is a figure which shows an example of the operation part 600 in this embodiment. In the present embodiment, the operation unit 600 is configured integrally with, for example, the imaging unit 200 and has an AF button 620 and a zoom button 630 . Other structures are the same as those of the first embodiment.

[0081] In the present embodiment, for example, when the zoom button 630 is pressed, the operation unit 600 outputs the zoom lens position information to the zoom lens control unit 320 . Specifically, whenever the zoom button 630 is pressed, the operation unit 600 will, for example, communicate with Figure 6 Information corresponding to the zoom lens positions A, B, C, and D shown in (A) is sequentially output to the zoom lens control unit. The zoom lens control unit 320 outputs the position information of the zoom lens output from the operation un...

no. 3 Embodiment approach

[0091] Next, use Figure 10 An endoscope system according to a third embodiment will be described. The operation unit 600 of the present embodiment, which is not shown, has, for example, a zoom lever 610 and the AF button 620 is omitted. The information output from the operation unit 600 is output to the zoom lens control unit 320 but not to the focus lens control unit 330 . Other structures are the same as those of the first embodiment.

[0092] use image 3 The details of the focus lens control unit 330 in this embodiment will be described. The focus lens control unit 330 (focus control unit in a broad sense) has an observation mode determination unit 331 , a focus lens position determination unit 332 , and an AF control unit 333 . The observation mode determination unit 331 determines the observation mode based on the zoom lens position information output from the zoom lens control unit 320 . Specifically, when the position of the zoom lens is on the WIDE side of the p...

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Abstract

Provided are a focus control device, an endoscope device, a focus control method, and the like capable of performing autofocus in an appropriate state by setting a focus mode of an imaging optical system. The focus control device includes: a focus control unit (330), which controls the focus of the imaging optical system and controls the setting of the focus mode of the imaging optical system. The imaging optical system includes at least a zoom lens (240) for adjusting the optical magnification; and The image acquisition unit that acquires an image through the imaging optical system has a focus mode including a fixed focus mode and an AF (Auto-Focus: automatic focus) mode. Whether the reference point between the far ends is on the wide-angle side or on the telephoto side is used to switch between fixed focus mode and AF mode.

Description

technical field [0001] The present invention relates to a focus control device, an endoscope device, a focus control method, and the like. Background technique [0002] Conventionally, endoscope devices with a zoom function have been put into practical use, and the zoom lens is used to adjust the field of view and optical magnification of the objective lens to observe the entire digestive canal as the subject on the wide-angle (hereinafter referred to as WIDE) side (usually Observation) and zoom in on a part of the digestive tract on the telephoto (hereinafter referred to as TELE) side for observation (magnification observation). [0003] In endoscope devices with a zoom function, the optical magnification is increased by narrowing the field of view of the objective lens on the TELE side, and the optimal subject distance is shortened by designing the lens to realize the magnification required for observation. optical magnification. Here, the optimum subject distance refers...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G02B7/28A61B1/00A61B1/04G02B23/24G02B13/00
CPCA61B1/00188G02B23/2438A61B1/05G02B7/102G02B23/2469H04N23/555H04N23/672H04N23/69H04N25/704H04N25/134G03B13/36H04N7/183
Inventor 吉野浩一郎樋口圭司
Owner OLYMPUS CORP