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Endoscopy system
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A technology of endoscope and optical system, applied in the field of endoscope system, can solve the problems of smaller blur circle, narrower depth of field of camera device, etc.
Active Publication Date: 2021-12-21
OLYMPUS CORP
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That is, in an imaging device, when the pixel pitch (the vertical and horizontal dimensions of one pixel) is reduced to increase the number of pixels, the allowable circle of confusion is also reduced accordingly, and thus the depth of field of the imaging device is narrowed.
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Embodiment A
[0077] (embodiment A, Figure 5 (a))
[0078] LiNbO 3 Single, d=0.17mm
[0079] λ / 4 wave plate that produces a phase difference of 27 wavelengths
Embodiment B
[0080] (embodiment B, Figure 5 of (b))
[0081] LiNbO 3 + glass, d = 0.06 (LN) + 0.24 (S-BSL7, made by Ohara Corporation) mm
[0082] Example of a λ / 4 wave plate that produces a phase difference of 10 wavelengths
Embodiment C
[0083] (embodiment C, Figure 5 of (c))
[0084] YVO 4 + glass, d = 0.2 (Y) + 0.2 (S-BSL7, made by Ohara Corporation) mm
[0085] Example of a λ / 4 wave plate that produces a phase difference of 85 wavelengths
[0086] Image 6 The structure of the endoscope system is shown. An endoscope system 1 according to the present embodiment includes an endoscope 2 inserted into a subject, a light source device 3 for supplying illumination light to the endoscope 2 , a processor device 4 , and an image display device 5 .
[0087] The processor device 4 has a function of performing image processing, and also has other functions. The processor device 4 has an actuator control unit 25 , an image processor 30 , and a control unit 39 . The image display device 5 displays the image signal generated by the processor device 4 as an endoscopic image.
[0088] The endoscope 2 has an elongated insertion portion 6 to be inserted into the subject, and an operation portion 7 provided at the rear...
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Abstract
An object of the present invention is to provide a small endoscope system that can obtain a sufficient depolarizing effect without using a depolarizing plate having a complicated structure. The endoscope system is characterized in that it has an objective optical system (OBL) arranged in order from the object side, an optical path splitting unit (120) for splitting light from the objective optical system into two beams, and an optical path splitting unit (120) for photographing the two beams obtained by the split. An image pickup element (122), a λ / 4 wave plate (121a) formed by a birefringent material is arranged in the part between the objective optical system (OBL) and the optical path division unit (120) in the optical path, λ / 4 The wave plate (121a) satisfies the following conditional expressions (1) and (2). 10≤(d / d0)×0.25≤85 (1) 0.09≤|Δn|≤0.23 (2) Here, d is the thickness of the λ / 4 wave plate, and d0 is zero for the e-line of the λ / 4 wave plate The thickness of the stage, Δn is the birefringence of the λ / 4 wave plate for the e-line.
Description
technical field [0001] The present invention relates to an endoscope system. Background technique [0002] It is generally known that in equipment including an imaging element such as an endoscope system, the depth of field becomes narrower as the number of pixels of the imaging element increases. That is, in the imaging device, when the pixel pitch (the vertical and horizontal dimensions of one pixel) is reduced to increase the number of pixels, the allowable circle of confusion is also reduced accordingly, and thus the depth of field of the imaging device is narrowed. [0003] In order to expand the depth of field, for example, a structure has been proposed in which a self-image is divided and imaged, and the obtained images are synthesized through image processing to expand the depth. Here, when the self-image is divided, it is efficient to use an optical path division unit using polarized light. In the optical path division unit using polarized light, it is desirable t...
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