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Optical system for endoscope

An optical system and endoscope technology, applied in the direction of endoscope, optics, optical components, etc., can solve the problems of long distance, inability to use urinary endoscope, long air interval, etc.

Inactive Publication Date: 2015-09-23
OLYMPUS CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] However, in the optical systems disclosed in Patent Documents 1 to 3, the positive third lens is arranged between the negative second lens and the brightness stop, and the distance from the first lens to the brightness stop is long, which causes the entrance pupil to be distorted. The position is moved to the image side
Therefore, making the negative first lens radially bulky is not ideal for endoscopes, especially for urological endoscopes
[0007] In addition, in the optical system disclosed in Patent Document 4, a filter is arranged between the negative second lens and the brightness stop and the air space between the filter and the brightness stop is long, so the position of the entrance pupil is shifted to the image side
Therefore, making the negative first lens radially bulky is not ideal for endoscopes, especially for urological endoscopes

Method used

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  • Optical system for endoscope
  • Optical system for endoscope
  • Optical system for endoscope

Examples

Experimental program
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Embodiment approach

[0028] The endoscope optical system of this embodiment includes a negative lens group, a brightness stop, and a positive lens group in this order from the object side. Also, the negative lens group includes a negative first lens and a negative second lens in order from the object side. Thereby, the position of the entrance pupil can be moved to the object side, and the diameter reduction of the negative first lens can be realized. Furthermore, the number of lenses constituting each group of the endoscope optical system can be reduced, and the total length and cost can be reduced.

[0029] Here, the optical system for an endoscope satisfies the following conditional expressions (1) and (2).

[0030] 0.05

[0031] 0.5

[0032] Among them, H(100) is the height of the chief ray incident on the object-side surface of the first lens with an incident angle of view of 100 degrees, Rf01 is the curvature radius of the object-side surfa...

no. 1 example

[0093] Figure 1A It is a figure showing the structure along the optical path of the endoscope optical system of the first embodiment, Figure 1B It is a diagram showing spherical aberration, astigmatism, distortion aberration, and lateral chromatic aberration of the endoscope optical system of the first embodiment.

[0094]Here, in the spherical aberration diagram and the lateral chromatic aberration diagram of the aberration diagram, the g-line (wavelength 435.84 nm) is indicated by a dotted line, the d-line (wavelength 587.56 nm) is indicated by a solid line, and the dotted line is indicated by a dotted line. C line (wavelength 656.27nm). In addition, in the astigmatism diagram of the aberration diagram, the meridian M is indicated by a dotted line, and the sagittal line S is indicated by a solid line. In addition, FIY in the aberration diagram indicates the half angle of view, and FNO. in the aberration diagram and the numerical data described below indicates the apertur...

no. 2 example

[0098] Figure 2A It is a figure showing the structure along the optical path of the endoscope optical system of the second embodiment, Figure 2B It is a diagram showing spherical aberration, astigmatism, distortion aberration, and chromatic aberration of magnification of the endoscope optical system of the second embodiment.

[0099] Here, in the spherical aberration diagram and lateral chromatic aberration diagram of the aberration diagram, the g-line (wavelength 435.84 nm) is indicated by a dotted line, the d-line (wavelength 587.56 nm) is indicated by a solid line, and the C-line is indicated by a dotted line. line (wavelength 656.27nm). In addition, in the astigmatism diagram of the aberration diagram, the meridian M is indicated by a dotted line, and the sagittal line S is indicated by a solid line. In addition, FIY in the aberration diagram indicates the half angle of view, and FNO. in the aberration diagram and the numerical data described below indicates the apertu...

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Abstract

Provided is an optical system for an endoscope, the optical system including a negative lens group G1, an aperture diaphragm S and a positive lens group G2 in this order from an object side, wherein the negative lens group G1 includes a negative first lens L1 and a negative second lens L2 in this order from the object side; and wherein the optical system meets conditional expressions (1) and (2): 0.05 < H 100 × nd �¢ 01 - 1 / Rf �¢ 01 < 0.38 and 0.5 < enp / FL < 2.5 where: H(100) is a height at which a principal ray with an angle of incidence of 100 degrees which falls on a surface of the first lens falls on the surface of the first lens; Rf01 is a curvature radius of an L surface of the first lens; nd01 is a refractive index of the first lens L1; FL is a focal length of an entire system; and enp is an entrance pupil position.

Description

technical field [0001] The present invention relates to an endoscope optical system having a viewing angle of 200 degrees or more. Background technique [0002] For example, in order to observe the inside of a body cavity with an endoscope, the optical system for an endoscope is required to be small and wide-angle, and in particular, a urinary endoscope needs to be small in the radial direction. [0003] As an optical system that can be applied to an endoscope with a viewing angle of 200 degrees or more, for example, Japanese Patent Laid-Open No. 2007-279632 (Patent Document 1), Japanese Patent Laid-Open No. 2008-058387 (Patent Document 2), Japanese Patent Laid-Open No. The system described in Publication No. 2005-227426 (Patent Document 3) and Japanese Patent Application Publication No. 2009-276371 (Patent Document 4). [0004] Among these patent documents, the optical systems disclosed in Patent Documents 1 to 3 are advantageous in that they have a negative first lens, a ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G02B13/04A61B1/00
CPCA61B1/0019A61B1/307G02B13/06A61B1/002G02B23/2407A61B1/00183G02B23/243
Inventor 片仓正弘
Owner OLYMPUS CORP