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Objective optical system for endoscope and endoscope

A technology for optical systems and endoscopes, applied to the field of objective lens optical systems for endoscopes and endoscopes, can solve the problems of correcting chromatic aberration and chromatic aberration of magnification, increasing chromatic aberration of magnification, and the lens system is not achieved, and achieves high optical performance, chromatic aberration correction, miniaturization effect

Active Publication Date: 2019-06-25
FUJIFILM CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0012] However, the wider the angle, the greater the chromatic aberration of magnification, and it is not easy to achieve wide-angle and good chromatic aberration correction at the same time
The lens systems of the embodiments described in Patent Documents 1 to 6 cannot be said to have achieved the widening of the angle required in recent years.
Considering the short-wavelength region around 400nm (nanometer) as well, the lens system described in Patent Document 7 cannot be said to be able to correct axial chromatic aberration and lateral chromatic aberration satisfactorily over the entire range from the short-wavelength region to the visible region.
The lens system described in Patent Document 8 does not meet the requirements in recent years for all matters such as widening the angle of view, good chromatic aberration correction, and miniaturization of the lens outer diameter.

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

[0078] figure 1 Fig. 1 shows a cross-sectional view showing the structure and optical path of the objective optical system for an endoscope in Example 1. The method of illustration is as described above, and therefore a part of repeated description is omitted here. The objective optical system for an endoscope of Example 1 includes a front group GA having a negative refractive power, an aperture stop St, and a rear group GB having a positive refractive power in this order from the object side toward the image side. The front group GA includes only three lenses including a first lens L1 , a second lens L2 , and a third lens L3 in this order from the object side toward the image side as lenses. The optical component PP1 is arranged between the first lens L1 and the second lens L2. The rear group GB includes a fourth lens L4, a fifth lens L5, and a sixth lens L6 in this order from the object side toward the image side. The second lens L2 and the third lens L3 are cemented toget...

Embodiment 2

[0092] About the objective optical system for endoscope of embodiment 2, the sectional view of structure and optical path is shown in figure 2 , the basic lens data are shown in Table 3, the specifications are shown in Table 4, and the aberration diagrams are shown in Figure 5 .

[0093] [table 3]

[0094] Example 2

[0095] sn

R

D

Nd

vd

OBJ

10.00000

10.0000

1

∞

0.3600

1.88299

40.78

2

1.12613

0.4582

3

∞

0.3000

1.88299

40.78

4

∞

0.0350

5

∞

0.3500

2.00100

29.13

6

2.69182

0.8085

1.72825

28.46

7

-1.93012

0.7943

8(St)

∞

0.0175

9

∞

0.8925

1.51742

52.43

10

-1.41221

0.1000

11

-4.64158

0.8920

1.59522

67.73

12

-0.83200

0.3500

1.84666

23.78

13

-1.65170

0.3868

14

∞

1.5000

1.55919

5...

Embodiment 3

[0100] About the objective optical system for endoscope of embodiment 3, the sectional view of structure and optical path is shown in image 3 , the basic lens data are shown in Table 5, the specifications are shown in Table 6, and the aberration diagrams are shown in Image 6 .

[0101] [table 5]

[0102] Example 3

[0103]

[0104]

[0105] [Table 6]

[0106] Example 3

[0107] f

1.198

Bf

2.438

FNo.

7.21

2ω(°)

153.6

[0108] Table 7 shows the corresponding values ​​of the conditional expressions (1) to (6) of the endoscope objective optical systems of Examples 1 to 3. In Examples 1 to 3, the d-line was used as the reference wavelength. Table 7 shows values ​​based on the d-line.

[0109] [Table 7]

[0110] formula number

Example 1

Example 2

Example 3

(1)

|f23| / fA

-1.098

-0.548

-1.360

(2)

d34 / f

0.726

0.688

0.766

(3)

(1+R2 / R1) / (1-R2 / R1)

1.000...

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PUM

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Abstract

Provided are an objective optical system for an endoscope and an endoscope provided with the objective optical system for an endoscope, the objective optical system being capable of satisfactorily correcting the chromatic aberration from a short wavelength region near 400 nm (nanometer) to a visible region at a wide angle, achieving a reduction in the size of the outer diameter of a lens, and having high performance. The objective optical system for an endoscope includes, in order from the object side, a negative front group (GA), an aperture stop (St), and a positive rear group (GB). The front group (GA) is only provided with, as a lens, a cemented lens in which a negative first lens (L1), a negative second lens (L2), and a positive third lens (L3) are joined in this order from the objectside. The rear group (GB) is only provided with, as a lens, a cemented lens in which a positive fourth lens (L4), a positive fifth lens (L5), and a negative sixth lens (L6) are joined in this order from the object side. Specified conditional expressions are satisfied.

Description

technical field [0001] The invention relates to an objective optical system for an endoscope and an endoscope. Background technique [0002] Conventionally, endoscopes have been used in the medical field for observation, treatment, and the like inside a patient. The following Patent Documents 1 to 8 describe lens systems that can be used as objective optical systems for endoscopes. These lens systems include, in order from the object side, a front group having negative refractive power, a diaphragm, and a rear group having positive refractive power. [0003] Patent Document 1: Japanese Patent No. 2596827 [0004] Patent Document 2: Japanese Patent Laid-Open No. 2009-080413 [0005] Patent Document 3: Japanese Patent No. 4265909 [0006] Patent Document 4: Japanese Patent Laid-Open No. 2011-227380 [0007] Patent Document 5: Japanese Patent No. 4999078 [0008] Patent Document 6: Japanese Patent No. 5363354 [0009] Patent Document 7: Japanese Patent No. 5324321 [00...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02B23/24G02B13/00G02B13/06
CPCG02B13/0045G02B13/06G02B23/243G02B9/62A61B1/00096A61B1/00188G02B13/002A61B1/00174
Inventor 马场智之
Owner FUJIFILM CORP