Wide angle optical system and endoscope

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

Active Publication Date: 2016-07-27
OLYMPUS CORP
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  • Abstract
  • Description
  • Claims
  • Application Information

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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 on

Method used

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  • Wide angle optical system and endoscope
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  • Wide angle optical system and endoscope

Examples

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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 purpose of the present invention is to sufficiently correct chromatic aberration of magnification through a common optical element in the later stage while aligning the direction of an image of all fields of view. A wide angle optical system (3) comprises a first group (6) having negative and positive lenses (4, 5) with negative refractive power, a second group (7) having a reflective-refractive optical element (14), and a third group (8). The reflective-refractive optical element (14) includes a first surface (11) on the object side, having a first transmitting surface (11a) and a first reflecting surface (11b) disposed surrounding the first transmitting surface, a second surface (12) on the image side, having a second transmitting surface (12a) and a second reflecting surface (12b) disposed surrounding the second transmitting surface, and a third surface (13) that is a conical transmitting surface disposed between the first surface (11) and the second surface (12) and having an apex angle toward the object. The wide angle optical system (3) satisfies the following expression: vn > vp alpha/2 > 90 DEG - theta k Where vn represents the Abbe number of the negative lens (4), vp represents the Abbe number of the positive lens (5), alpha represents the angle of the apex angle on the third surface (13), and theta k represents a half field angle (0 < theta k < 90 DEG) of principal ray in the minimum angle of view within the lateral field of view.

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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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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