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Endoscope optical system

A technology for optical systems and endoscopes, applied in the direction of endoscopes, optics, optical components, etc., can solve problems such as larger diameters

Inactive Publication Date: 2015-06-03
OLYMPUS CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, there is a problem that the overall diameter of the distal end of the endoscope becomes large.

Method used

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  • Endoscope optical system
  • Endoscope optical system
  • Endoscope optical system

Examples

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Embodiment

[0099] Next, examples of the endoscope optical system 1 according to the first embodiment of the present invention will be described below with reference to the drawings.

[0100] like image 3 As shown, the optical system 1 for an endoscope of this embodiment includes a front lens group G1 and a rear lens group G2.

[0101] The front lens group G1 includes a negative lens 3 composed of a concave-convex lens, a stray light blocking diaphragm 4, two triangular prisms 5, 6, a brightness diaphragm 7, and a positive lens 8 composed of a plano-convex lens.

[0102] The rear lens group G2 includes a plano-convex lens 9 , a cemented lens composed of two convex lenses 10 and a concave-convex lens 11 , a plate glass 12 , a cemented lens composed of two concave lenses 13 and two convex lenses 14 , and a plate glass 16 .

[0103] The lens data for the above lenses are shown below.

[0104]

[0105]

[0106] Additionally, in this example,

[0107] (Np1+Np2A) / 2=2.01

[0108] DP1 / ...

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Abstract

It is possible to obtain an endoscope-image with high image quality while keeping the diameter of a distal end portion of an endoscope small, even if the direction of the field of view of the endoscope is made adjustable. Provided is an endoscope optical system (1) including a negative lens (3) that focuses light entering along an incident optical axis (C1), a first prism (5) that deflects and emits the light focused by the negative lens (3) in a direction along a first axis (C2) substantially orthogonal to the incident optical axis (C1), a second prism (6) that has a reflecting surface, which deflects the light emitted from the first prism (5) in a direction of a second axis (C3) substantially orthogonal to the first axis (C2), and that is disposed so as to face the first prism (5), and a positive lens (8) that focuses the light emitted from the second prism (6), in this order from an object side, wherein the negative lens (3) and the first prism (5) are provided so as to be rotatable about the first axis (C2) relative to the second prism (6).

Description

technical field [0001] The present invention relates to an optical system for an endoscope. Background technique [0002] Conventionally, there is known an endoscope that can change the direction of the field of view of the endoscope by swinging or rotating a reflector or a prism disposed at the tip of the endoscope (for example, refer to Patent No. Document 1 and Patent Document 2). [0003] Patent Document 1: Specification of US Patent No. 6638216 [0004] Patent Document 2: Japanese Patent Laid-Open No. 2006-201796 [0005] Patent Document 3: Japanese Patent No. 4503535 [0006] However, in the case of Patent Document 1, the reflecting mirror is arranged in the endoscope at a position radially offset from the optical axis of another optical system, and moves in the radial direction in the endoscope. Therefore, there is a problem that the size of the distal end portion of the endoscope increases in the radial direction. In addition, since the size of other optical sys...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G02B13/04A61B1/00G02B23/26
CPCA61B1/00183A61B1/05G02B5/04G02B23/2446G02B27/0025A61B1/00096
Inventor 片仓正弘
Owner OLYMPUS CORP
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