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Objective optical system for endoscope and endoscope

An optical system and a technology for endoscopes, which are applied in the field of endoscopes, can solve the problems such as the inability to change the front end of the endoscope to a desired orientation, the restriction of the movement of the front end of the endoscope, etc., and achieve good optical performance and wide vision. field angle effect

Active Publication Date: 2021-08-03
HOYA CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, for example, when the diameter of the lumen is small, the movement of the distal end of the endoscope is limited, so it may not be possible to change the distal end of the endoscope to a desired orientation.

Method used

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  • Objective optical system for endoscope and endoscope
  • Objective optical system for endoscope and endoscope
  • Objective optical system for endoscope and endoscope

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0080] As described above, the objective optical system 100 for an endoscope according to Embodiment 1 of the present invention is structured as follows: figure 2 shown.

[0081] Table 1 shows specific numerical configurations (design values) of the objective optical system 100 for an endoscope (and optical components arranged behind it) according to the first embodiment. In addition to the face number 5 corresponding to the aperture S, the face number NO shown in the upper column (face data) of Table 1 corresponds to figure 2 The faces in are labeled rn (n is a natural number). In the upper column of Table 1, R (unit: mm) indicates the radius of curvature of each surface of the optical component, D (unit: mm) indicates the thickness of the optical component on the optical axis AX or the distance between optical components, and N (d) Represents the refractive index of the d-line (wavelength 588nm), and νd represents the Abbe number of the d-line. The lower column of Table...

Embodiment 2

[0095] Figure 4 is a cross-sectional view showing the arrangement of optical components including the objective optical system 100 for an endoscope according to Embodiment 2 of the present invention. Figure 5 Graphs A to D in are diagrams of various aberrations (spherical aberration, axial chromatic aberration, lateral chromatic aberration, astigmatism, distortion aberration) of the endoscope objective optical system 100 according to the second embodiment. Table 2 shows the specific numerical configuration and specifications of the objective optical system 100 for an endoscope according to the second embodiment.

[0096] 【Table 2】

[0097] Numerical Example 2

[0098] surface data

[0099]

[0100] various data

[0101]

[0102] A list of values ​​calculated when conditions (1) to (4) are applied to the objective optical system 100 for an endoscope according to the second embodiment is shown.

[0103] Condition (1): f 1 / f F =0.37

[0104] Condition (2): ED / f=4...

Embodiment 3

[0108] Figure 6 is a cross-sectional view showing the arrangement of optical components including the objective optical system 100 for an endoscope according to Embodiment 3 of the present invention. Figure 7 Graphs A to D in are graphs of various aberrations (spherical aberration, axial chromatic aberration, lateral chromatic aberration, astigmatism, distortion aberration) of the endoscope objective optical system 100 according to the third embodiment. Table 3 shows the specific numerical configuration and specifications of the objective optical system 100 for an endoscope according to the third embodiment.

[0109] 【table 3】

[0110] Numerical Example 3

[0111] surface data

[0112]

[0113] various data

[0114]

[0115] A list of values ​​calculated when conditions (1) to (4) are applied to the objective optical system 100 for an endoscope according to the third embodiment is shown.

[0116] Condition (1): f 1 / f F =0.23

[0117] Condition (2): ED / f=4.14 ...

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Abstract

To provide an objective optical system for an endoscope and an endoscope that solves the problem that it is difficult to design a small size and a wide angle of view while maintaining good optical performance. The objective optical system for an endoscope includes a first lens group with negative power and a second lens group with positive power sequentially from the object side, and the first lens group includes a negative lens with a concave surface facing the image side and a convex surface facing the image side in sequence from the object side. The positive lens on the side, the second lens group has at least a positive lens with a convex surface facing the image side and a cemented lens obtained by joining a negative lens and a positive lens in order from the object side, and satisfies prescribed conditions.

Description

technical field [0001] The present invention relates to an objective optical system for an endoscope and an endoscope incorporating the objective optical system for an endoscope. Background technique [0002] As a device for diagnosing the inside of a patient's body cavity, an endoscope (fiberscope or electron microscope) is generally known and put into practical use. It is preferable that the distal end portion of such an endoscope is designed to be small (small in diameter and short in overall length) so that it can be inserted smoothly even through a small gap. [0003] The designable minimum profile of the front end of the endoscope is actually limited by the large-sized mounting components. Examples of large-sized mounting components include objective optical systems for endoscopes. Selecting a small objective optical system for an endoscope as a mounting component is an effective means for achieving miniaturization of the distal end portion of the endoscope. [0004...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G02B13/00G02B13/06G02B13/18A61B1/00
CPCA61B1/00064A61B1/00163G02B13/004G02B13/06G02B13/18
Inventor 那须幸子
Owner HOYA CORP