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Objective lens for endoscope and endoscope

A technology for endoscopes and endoscopes, applied in the field of endoscopes, can solve problems such as large changes, observation objects out of view, and difficult observation

Active Publication Date: 2015-01-21
FUJIFILM CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the endoscopic objective lens described in Patent Document 1, if the focal length change amount of the intermediate point is large, the depth of observation becomes shallower in the area from the intermediate point to the closest point, and it is very difficult to adjust the focus.
In addition, if the amount of change in the focal length is large, the observation magnification will change greatly, and the size of the observation image will change greatly, making it very difficult to observe and the problem that the observed object will go out of the field of view may also occur.

Method used

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  • Objective lens for endoscope and endoscope
  • Objective lens for endoscope and endoscope
  • Objective lens for endoscope and endoscope

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0090] The lens configuration diagram of the objective lens for endoscope of Embodiment 1 is shown in figure 1 In , the illustration method and configuration are as described above, so repeated explanations are omitted here.

[0091] Table 1 shows basic lens data of the endoscope objective lens of Example 1. The column of Si in Table 1 indicates the i-th number (i=1, 2, 3, ...), the Ri column indicates the radius of curvature of the i-th surface, the Di column indicates the distance between the i-th surface and the i+1-th surface on the optical axis Z, and the Ndj column indicates The d-line (wavelength 587.6nm), the column of vdj indicates the Abbe number of the jth optical part to the d line.

[0092] The basic lens data also includes the aperture stop St and the optical members P1, P2, and P3, and (St) is written together with the surface number in the column of the surface number of the surface corresponding to the aperture stop St. In Table 1, the sign of the radius o...

Embodiment 2-1

[0104] figure 2 3 shows lens configuration diagrams of the farthest point observation state, intermediate point observation state, and closest point observation state of the endoscope objective lens of Example 2-1. The basic lens data of the endoscope objective lens of Example 2-1 is the same as that of Example 1, so description of the basic lens data is omitted here. The objective lens for endoscope of Example 2-1 has the same object distance in the farthest observation state as in Example 1, but the object distances in other observation states are different from those in Example 1. Table 3 shows the farthest point observation state of the endoscope objective lens of Example 2-1, the middle and far point observation state, the middle point observation state, and the respective object distances of the closest point observation state (variable 1), (possible Change the value of 2), (variable 3), (variable 4).

[0105] 【table 3】

[0106] Example 2-1

[0107] Observa...

Embodiment 2-2

[0110] The objective lens for endoscope of embodiment 2-2, basic lens data are identical with embodiment 1, embodiment 2-1, and the object distance of farthest point observation state and the object distance of closest point observation state are the same as embodiment 2-1 of the same. Embodiment 2-1 and Embodiment 2-2 are examples in which the basic lens data, the farthest object distance, and the closest object distance are the same, but the movement trajectory is variable. Table 4 shows the farthest point observation state, middle and far point observation state, intermediate point observation state, and closest point observation state of the objective lens for endoscope of Example 2-2. Change the value of 2), (variable 3), (variable 4).

[0111] 【Table 4】

[0112] Example 2-2

[0113] Observation status

[0114] The aberration diagrams of the spherical aberration, astigmatism, distortion, and lateral chromatic aberration of the farthest point observation state...

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Abstract

An objective lens for an endoscope performs focusing from a farthest point object to a nearest point object by moving, along optical axis Z, at least one lens group excluding a most object-side lens group. The following conditional formulas (1) and (2) are satisfied: 1.2≰ft / fw  (1); and 0.0<(fm−fw) / (ft−fw)≰0.5  (2), where ft: a focal length of an entire system when the objective lens has been focused on the nearest point object, fw: a focal length of the entire system when the objective lens has been focused on the farthest point object, dt: an object distance to the nearest point object, dw: an object distance to the farthest point object, dm, which is represented by dm=(2×dw×dt) / (dw+dt): an object distance to a middle point object, and fm: a focal length of the entire system when the objective lens has been focused on the middle point object.

Description

technical field [0001] The present invention relates to an objective lens for an endoscope and an endoscope, and more specifically, to an objective lens for an endoscope that focuses from an object at the farthest point to an object at the closest point by moving a part of lens groups in the system. And an endoscope provided with the objective lens for an endoscope. Background technique [0002] In the case of endoscopes, there is a need to observe a large area as a whole, and a need to observe in detail locally the affected part found in the overall observation, and so on. Conventionally, a fixed-focus lens with a deep field of view is often used to cope. such a request. However, as the trend of endoscopes, there is a tendency to increase the number of pixels and increase the angle of view, and because images captured by endoscopes are read for analysis and observation, further improvement in image quality is desired. [0003] In view of such a situation, the use state of...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02B7/04G02B23/24
CPCG02B23/243G02B23/2438
Inventor 山本力
Owner FUJIFILM CORP
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