Wide-angle optical system and endoscope

A wide-angle optical system and optical element technology, applied in the direction of endoscopes, optics, optical elements, etc., can solve problems such as chromatic aberration of magnification, and achieve the effect of correcting chromatic aberration of magnification

Active Publication Date: 2019-04-02
OLYMPUS CORP
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

[0009] The optical system of Patent Document 2 does not have the problem of correcting the lateral chromatic aberration, but since the first optical element only reflects the light from the side once, the difference between the image in the front view field and the side view field will be different. like upside down

Method used

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  • Wide-angle optical system and endoscope

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Embodiment Construction

[0095] The endoscope 1 and the wide-angle optical system 3 according to the first embodiment of the present invention will be described below with reference to the drawings.

[0096] Such as figure 1 As shown, the endoscope 1 according to this embodiment includes an elongated and flexible insertion part 2 to be inserted into the body, and a device provided at the front end of the insertion part 2 to obtain images of an object P in front and an object S in the side. Wide-angle optical system3.

[0097] Such as figure 2 As shown, the wide-angle optical system 3 according to this embodiment includes, in order from the front object P side, the first group 6 for converging the light from the front, the light condensed by the first group 6, and the light from the side. The incident second group 7 , the third group 8 that condenses the light from two directions passing through the second group 7 , and the imaging element 10 having the imaging surface 9 .

[0098] The first group...

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Abstract

The wide-angle optical system (3) is provided with a negative lens (4, 5) having negative and positive lenses (4, 5) for the purpose of sufficiently correcting lateral chromatic aberration by a common optical element of a subsequent stage while aligning the directions of images in all fields of view. A first group (6) of refractive power, a second group (7) and a third group (8) having a catadioptric optical element (14), the catadioptric optical element (14) has: a first surface (11) on the object side ), which has a first transmission surface (11a) and a first reflection surface (11b) arranged around it; a second surface (12) on the image side, which has a second transmission surface (12a) and a first reflection surface (11b) arranged around it; The surrounding second reflective surface (12b); and the third surface (13), which is configured between the first surface (11) and the second surface (12), is a conical surface-shaped transmissive surface with an apex angle on the object side. On the other hand, the wide-angle optical system (3) satisfies the following formula. νn>νp α / 2>90°‑θk νn is the Abbe number of the negative lens (4), νp is the Abbe number of the positive lens (5), α is the apex angle of the third surface (13), and θk is The half angle of view of the chief ray of the minimum angle of view in the side view field (0

Description

technical field [0001] The invention relates to a wide-angle optical system and an endoscope. Background technique [0002] A known optical system (for example, refer to Patent Documents 1 and 2.) is provided with: a first optical element having a negative refractive power, which transmits light from the front and reflects light from the side on the image side and the second optical element, which has a positive refractive power, synthesizes the two optical paths from the front and the side via the first optical element and forms an image on the shared imaging element, wherein, by having a super The wide-angle viewing angle enables simultaneous observation of two front and side images. [0003] In the optical system of Patent Document 1, light from the side is incident on the cylindrical surface of the first optical element to be refracted, and after being reflected once on the reflection surface on the image side and on the object side opposite to the image side in sequenc...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G02B13/04A61B1/00G02B13/18G02B17/08G02B23/26
CPCG02B17/0896G02B5/001A61B1/00096A61B1/00163A61B1/00183A61B1/00174G02B13/06G02B17/0856G02B23/243G02B13/0055G02B9/12A61B1/00195G02B27/0977G02B17/061A61B1/00G02B13/04G02B13/18G02B17/08G02B23/26G02B27/0025
Inventor 水泽圣幸
Owner OLYMPUS CORP
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