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Objective optical system for endoscope

An optical system and a technology for endoscopes, which are applied to the field of objective lens optical systems for endoscopes, can solve problems such as vignetting at the periphery of a picture, and achieve the effects of reducing optical performance, high definition, and suppressing focus shift.

Active Publication Date: 2019-07-09
OLYMPUS CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Also in this case, vignetting tends to occur at the periphery of the screen in the same manner.

Method used

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

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0178] The objective optical system for an endoscope according to Example 1 will be described. figure 2 (a) is a figure which shows the lens cross-sectional structure of the objective optical system for endoscopes concerning this Example.

[0179] The present embodiment is composed of a front group FL of negative overall refractive power, an aperture stop S, and a rear group RL of generally positive refractive power arranged in this order from the object side.

[0180] In this embodiment, a first lens L1 having a plano-concave shape with a flat object side and a negative refractive power, and a second lens L1 having a meniscus shape with a convex surface facing the image side and a positive refractive power are arranged in order from the object side. Lens L2, infrared cut filter F1 of parallel plate, aperture stop S, third lens L3 with biconvex shape and positive refractive power, fourth lens L4 with biconvex shape and positive refractive power and convex surface The cemente...

Embodiment 2

[0187] The objective optical system for an endoscope according to Example 2 will be described. image 3 (a) is a figure which shows the lens cross-sectional structure of the objective optical system for endoscopes concerning this Example.

[0188] The present embodiment is composed of a front group FL of negative overall refractive power, an aperture stop S, and a rear group RL of generally positive refractive power arranged in this order from the object side.

[0189] In this embodiment, a first lens L1 having a plano-concave shape with a flat object side and a negative refractive power, and a second lens L1 having a meniscus shape with a convex surface facing the image side and a positive refractive power are arranged in order from the object side. Lens L2, infrared cut filter F1 of parallel plate, aperture stop S, third lens L3 with biconvex shape and positive refractive power, fourth lens L4 with biconvex shape and positive refractive power and convex surface The cemented...

Embodiment 3

[0194] The objective optical system for an endoscope according to Example 3 will be described. Figure 4 (a) is a figure which shows the lens cross-sectional structure of the objective optical system for endoscopes concerning this Example.

[0195] The present embodiment is composed of a front group FL of negative overall refractive power, an aperture stop S, and a rear group RL of generally positive refractive power arranged in this order from the object side.

[0196] In this embodiment, a first lens L1 having a plano-concave shape with a flat object side and a negative refractive power, and a second lens L1 having a meniscus shape with a convex surface facing the image side and a positive refractive power are arranged in order from the object side. Lens L2, an infrared cut filter F1 of a parallel plate, an aperture stop S, a third lens L3 having a biconvex shape and a positive refractive power, a fourth lens L4 having a biconvex shape and a positive refractive power, and a ...

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Abstract

The present invention provides a compact objective optical system for an endoscope, by which wide-angle and high-definition image quality can be obtained while defocusing, field angle deviation and deviation angle deviation at the time of imaging and assembly are reduced. The objective optical system comprises, in order from the object side, a front group FL that is negative as a whole, an aperture stop S, and a rear group RL that is positive as a whole, wherein the front group FL comprises a first lens L1 that is a negative single lens, and a second lens L2 that is a positive single lens, therear group RL comprises a third lens L3 that is a positive single lens, a cemented lens CL1 of a positive fourth lens L4 and a negative fifth lens L5, and a positive sixth lens L6, the object side ofthe first lens L1 is a flat surface, the second lens L2 has a meniscus shape with a convex surface facing the image side, the sixth lens L6 is cemented to a parallel plate, and the following conditional expressions (1), (2) are satisfied. (1): 1.0<f3 / d6<2.8 (2): 1.7<|f1 / f|<10.

Description

technical field [0001] The invention relates to an objective optical system, in particular to an endoscope objective optical system applied to a medical endoscope. Background technique [0002] In recent years, with regard to medical endoscopes, small size endoscopes with wide angles and high image quality have been demanded in order to reduce the burden on patients and to improve diagnostic performance. Therefore, as an imaging element mounted in an endoscope, the pixel pitch and the size of the imaging element are decreasing year by year. Along with this, the objective optical system for an endoscope needs to satisfy optical performances such as widening the angle of view and aberration correction while being miniaturized. [0003] By reducing the pixel pitch and reducing the image height while maintaining the same number of pixels, the optical system can also be relatively miniaturized. However, when the aperture stop is similarly miniaturized, the resolution is lowered...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02B13/04
CPCA61B1/00096A61B1/00174A61B1/0011G02B23/243A61B1/046A61B1/0623G02B13/04
Inventor 川上欣洋
Owner OLYMPUS CORP
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