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Objective lenses for endoscopes and endoscopes

A technology for endoscopes and endoscopes, which is applied in the field of endoscopes and objective lenses for endoscopes, can solve the problems of unrecorded focus switching between far-point objects and near-point objects, and achieve deep observation depth, good images, The effect of high-resolution performance

Active Publication Date: 2019-09-24
FUJIFILM CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] The objective lens for an endoscope described in Patent Document 2 performs well in correcting chromatic aberration in a wide wavelength region, but Patent Document 2 does not describe switching the focus between a far-point object and a near-point object

Method used

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  • Objective lenses for endoscopes and endoscopes
  • Objective lenses for endoscopes and endoscopes
  • Objective lenses for endoscopes and endoscopes

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0138] The lens structure and optical path of the endoscope objective lens of embodiment 1 are as follows figure 1 As shown, the illustration method is as above, so repeated descriptions are omitted here. Table 1 shows basic lens data of the endoscope objective lens of Example 1. The Si column in Table 1 indicates the number of the i-th (i=1, 2, 3, ...) surface that increases sequentially toward the image side, taking the object-side surface of the structural element closest to the object side as the first , the Ri column indicates the radius of curvature of the i-th surface, and the Di column indicates the distance between the i-th surface and the i+1-th surface on the optical axis Z. In addition, the Ndj column indicates the d-line (wavelength 587.6nm) of the j-th (j=1, 2, 3, ...) optical elements that increase sequentially toward the image side with the optical element closest to the object side as the first ), the column νdj indicates the Abbe number based on the d-line ...

Embodiment 2

[0151] figure 2 The lens structure diagram and optical path of the objective lens for endoscopes of Example 2 are shown in . Table 3 and Table 4 show the basic lens data, data items, and values ​​of variable surface intervals of the endoscope objective lens of Example 2, respectively. Figure 8 Each aberration diagram of the endoscope objective lens of Example 2 is shown in .

[0152] 【table 3】

[0153] Example 2

[0154] Si Ri Di Ndj νdj θgFj θhgj 1 7.135 0.350 1.88300 40.81 2 0.892 0.390 3 27.402 0.890 1.84666 23.78 0.6205 0.5645 4 1.818 1.700 1.89286 20.36 0.6394 0.5964 5 ∞ 0.000 6(St) ∞ 0.035 7 ∞ 0.730 1.69680 55.53 8 -1.661 DD[8] 9 -6.085 0.940 1.59522 67.73 0.5443 0.4505 10 -1.022 0.350 1.72825 28.46 0.6077 0.5447 11 -1.818 DD[11] 12 ∞ 3.500 1.55920 53.92 13 ∞ 0.000

[0155] 【Table...

Embodiment 3

[0159] image 3 The lens structure diagram and optical path of the objective lens for endoscopes of Example 3 are shown in . Table 5 and Table 6 show the basic lens data, data items, and values ​​of variable surface intervals of the endoscope objective lens of Example 3, respectively. Figure 9 Each aberration diagram of the endoscope objective lens of Example 3 is shown in .

[0160] 【table 5】

[0161] Example 3

[0162] Si Ri Di Ndj νdj θgFj θhgj 1 7.135 0.350 1.88300 40.81 2 0.892 0.389 3 25.201 1.000 1.84666 23.78 0.6205 0.5645 4 1.818 1.570 1.89286 20.36 0.6394 0.5964 5 ∞ 0.000 6(St) ∞ 0.035 7 ∞ 0.730 1.69680 55.53 8 -1.661 DD[8] 9 -5.002 0.940 1.62041 60.29 0.5427 0.4500 10 -1.022 0.360 1.80518 25.42 0.6162 0.5573 11 -1.742 DD[11] 12 ∞ 3.500 1.55920 53.92 13 ∞ 0.000

[0163] 【Table ...

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PUM

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Abstract

An objective lens for endoscopes is constituted essentially by, in order from the object side: a negative first lens having a concave surface toward the image side; a first cemented lens, formed by cementing a second lens and a third lens having refractive powers with signs opposite each other, provided in this order from the object side, together; a stop; a positive fourth lens having a convex surface toward the image side; and a second cemented lens, formed by cementing a positive fifth lens and a negative sixth lens, provided in this order from the object side, together, in which the coupling surface is convex toward the image side. Focusing from an object at a most distant point to an object at a most proximal point is performed by moving only the second cemented lens. A predetermined conditional formula is satisfied.

Description

technical field [0001] The present invention relates to an objective lens for an endoscope and an endoscope provided with the objective lens for an endoscope. Background technique [0002] Conventionally, in endoscopic observation, there has been a strong desire to acquire high-quality images with a deep observation depth, and in response to this strong desire, an objective lens for an endoscope capable of focusing has been proposed. For example, in the following patent document 1, it is described that a lens group on the image side is configured by two lens groups, and the lens group on the image side is moved to the image side and the object side to focus on a far-point object and a near-point object respectively. objective lens. [0003] On the other hand, in recent years, blood vessels, surface structures, and the like have been observed by converting images captured by an endoscope into electrical signals and further image processing. In such observation, a short-wave...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G02B23/24
CPCG02B23/2438G02B23/243G02B27/0025
Inventor 原田惠介长伦生
Owner FUJIFILM CORP