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Endoscope objective lens and endoscope

A technology for endoscopes and endoscopes, applied in the field of endoscopes, can solve the problems of weakening correction effect of chromatic aberration of magnification, difficult correction of chromatic aberration of magnification, and difficult correction

Active Publication Date: 2010-06-16
FUJI PHOTO OPTICAL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, as the back focus increases, the light height of this optical component decreases and the correction effect of chromatic aberration of magnification becomes weaker, and its correction becomes difficult
Especially in an optical system with a back focus longer than 2.5 times the focal length, correction of chromatic aberration of magnification is not easy because there is no lens at a position close to the imaging plane

Method used

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  • Endoscope objective lens and endoscope
  • Endoscope objective lens and endoscope
  • Endoscope objective lens and endoscope

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0151] The values ​​(specification values) of the objective lens for endoscope related to Embodiment 1 are shown in Table 1, and the lens configuration diagram is shown in Table 1. Figure 5 . Figure 5The left side is the object side, and the right side is the image side. In Table 1, the plane numbers indicate i-th plane numbers (i=1, 2, 3, . Ri represents the radius of curvature of the i-th surface (i-th surface), and Di represents the distance between the i-th surface and the i+1-th surface on the optical axis Z. Moreover, ndj represents the j-th (j=1, 2, 3, ...) lens or the parallel plane plate 17 relative to the d line ( The refractive index of wavelength 587.6nm), vdj represents the Abbe number of the jth lens (jth lens) or the parallel plane plate 17 with respect to the d line. In Table 1, the unit of the radius of curvature and the distance between surfaces is mm, and the radius of curvature is defined as positive when the convex surface faces the object side and ne...

Embodiment 2

[0171] The various element values ​​of the objective lens for endoscope involved in embodiment 2 are shown in Table 2, and the lens constitution diagram is shown in Table 2. Image 6 . exist Image 6 , symbols Ri and Di correspond to Ri and Di in Table 2.

[0172] 【Table 2】

[0173] Example 2

[0174] Face number Ri Di ndj vdj

[0175] 1 ∞ 0.38128 1.88300 40.8

[0176] 2 0.7256 0.30504

[0177] 3 8.2441 0.78564 1.92286 18.9

[0178] 4 -3.0060 0.38128 1.83481 42.7

[0179] 5 10.8937 0.02179

[0180] 6 (open aperture) ∞ 0.03813

[0181] 7 ∞ 1.00479 1.62041 60.3

[0182] 8 -1.2345 0.10894

[0183] 9 5.3069 0.98045 1.62041 60.3

[0184] 10 -1.1058 0.38128 2.14352 17.8

[0185] 11 -1.8364 0.65520

[0186] 12 ∞ 3.00000 1.51633 64.1

[0187] Image plane ∞

Embodiment 3

[0189] The various element values ​​of the objective lens for endoscope involved in embodiment 3 are shown in Table 3, and the lens configuration diagram is shown in Table 3. Figure 7 . exist Figure 7 , symbols Ri and Di correspond to Ri and Di in Table 3.

[0190] 【table 3】

[0191] Example 3

[0192] Face number Ri Di ndj vdj

[0193] 1 9.0671 0.39669 2.00950 29.4

[0194] 2 0.7131 0.31774

[0195] 3 15.0254 0.39669 1.83481 42.7

[0196] 4 1.1745 0.91980 1.92286 18.9

[0197] 5 ∞ 0.03967

[0198] 6 (aperture aperture) ∞ 0.02042

[0199] 7 -11.3339 0.91635 1.62041 60.3

[0200] 8 -1.2695 0.11334

[0201] 9 4.9733 1.02432 1.62041 60.3

[0202] 10 -1.1039 0.39669 2.14352 17.8

[0203] 11 1.8602 0.73389

[0204] 12 ∞ 3.00000 1.51633 64.1

[0205] Image plane ∞

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Abstract

The invention provides an object lens for endoscope, which not only ensures the long rear cut-off distance, but also excellently corrects the lateral chromatic aberration, wherein a negative first lens (L1) having concave surface toward image side, a first joint lens (L23) formed by jointing a second lens and a third lens, one positive and one negative, a positive fourth lens (L4) having the sidewith large absolute value of plane or curvature radius toward object side, and a second joint lens (L56) with integral positive refractive force formed by sequentially jointing a positive fifth lens and a negative sixth lens from the object side are arranged in sequence from the object side, which fulfill the conditions (1), (2): (formula), wherein, f is focus; Bf is the rear cut-off distance; v5 is the abbe number of the fifth lens; the v6 is the abbe number of the sixth lens; RA is the curvature radius of the joint surface of the second joint lens; d6 is the central thickness of the sixth lens; n6 is the refractive rate of the sixth lens.

Description

technical field [0001] The present invention relates to an objective lens for an endoscope and an endoscope, in particular to an objective lens for an endoscope suitable for use by arranging a prism for bending an optical path or the like between the objective lens for an endoscope and its imaging surface, and a This endoscope is an endoscope with an objective lens. Background technique [0002] Conventionally, endoscopes have been used at medical sites and the like to observe and treat the inside of patients. As an endoscope, a direct-view endoscope in which an observation objective lens is disposed at the distal end of the insertion portion of the endoscope inserted into the body and a solid-state imaging device is disposed on the imaging surface of the objective lens to observe the long-axis direction of the insertion portion is often used. Most endoscopes of this type are arranged so that the light-receiving surface of the solid-state imaging element is parallel to the ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G02B13/00G02B23/24A61B1/00
Inventor 宫野俊
Owner FUJI PHOTO OPTICAL CO LTD
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