Endoscopic image-capturing objective lens optical system

Abstract

The invention discloses an endoscopic image-capturing objective lens optical system comprising a first lens group, a diaphragm and a second lens group from an object side to an image side. The first lens group has positive power and comprises a first lens and a second lens. The first lens is made of a plastic material and has at least one spherical surface. The second lens group comprises a third lens having positive power. The endoscopic image-capturing objective lens optical system satisfies a following conditional expression: f / H(L1r1) < 1.5; H (L1r1) / IMH < 1.5; N1 > 1.7; wherein f is the focal length of the endoscopic image-capturing objective lens optical system, H(L1r1) refers to the height of a main light ray corresponding to the maximum image height during conventional observation passing through a surface of the object side of the first lens group, IMH refers to the maximum image height on a corresponding chip light-sensitive surface during conventional observation, and N1 is the refractive index of the first lens. The endoscopic image-capturing objective lens optical system has a small diameter, a wide field of view, and is capable of improving a close-up shot effect.

Description

technical field

[0001] The invention relates to an objective optical system, in particular to an endoscope imaging objective optical system. Background technique

[0002] Endoscope is a kind of medical optical instrument, which is sent into the body from the outside through the natural cavity of the human body to check the diseases in the body. Scanning the film greatly improves the accuracy of cancer diagnosis, and can carry out some minimally invasive surgical treatment.

[0003] In order to alleviate the pain of patients to a greater extent, shorten the recovery time after surgery, reduce the work of doctors, and improve the diagnostic level of visualization and scientific data judgment, it is necessary to further reduce the endoscopic camera system and improve its imaging shooting effect Therefore, it is a technical subject to study and use a larger field of view, smaller and clearer objective lens optical system for endoscopic imaging.

[0004] Chinese patent document...

Examples

Embodiment 1

[0077] Please refer to figure 1 , a camera objective optical system for endoscopy includes a first lens group 10 with positive refractive power, a diaphragm 30, a second lens group 20 with positive refractive power, an optical filter 40, and a flat plate from the object side to the image side Glass 50 and photosensitive surface 60 of the chip. The optical filter 40 is mainly used to cut off a specific wavelength, and the flat glass 50 is mainly used to protect the photosensitive surface 60 of the chip.

[0078] The first lens group 10 is composed of a first lens 11 with negative power and a second lens 12 with positive power. The object side and image side of the first lens 11 are spherical, and the object side is Convex, its image side is concave, the object side and image side of the second lens 12 are both convex and spherical, the second lens group 20 is composed of a third lens 21 with positive refractive power, the third Both the object side and the image side of the l...

Embodiment 2

[0083] Please refer to image 3 , a camera objective optical system for endoscopy includes a first lens group 10 with positive refractive power, a diaphragm 30, a second lens group 20 with positive refractive power, an optical filter 40, and a flat plate from the object side to the image side Glass 50 and photosensitive surface 60 of the chip. The optical filter 40 is mainly used to cut off a specific wavelength, and the flat glass 50 is mainly used to protect the photosensitive surface 60 of the chip.

[0084] The first lens group 10 is composed of a first lens 11 with negative refractive power and a second lens 12 with positive refractive power. The object side of the first lens 11 is a plane, and its image side is spherical and concave. , the object side and the image side of the second lens 12 are both convex and spherical, the diaphragm 30 is attached to the image side of the second lens 12, and the second lens group 20 has a positive refractive power The third lens 21 ...

Embodiment 3

[0090] Please refer to Figure 5 , a camera objective optical system for endoscopy includes a first lens group 10 with positive refractive power, a diaphragm 30, a second lens group 20 with positive refractive power, an optical filter 40, and a flat plate from the object side to the image side Glass 50 and photosensitive surface 60 of the chip. The optical filter 40 is mainly used to cut off a specific wavelength, and the flat glass 50 is mainly used to protect the photosensitive surface 60 of the chip.

[0091] The first lens group 10 is composed of a first lens 11 with negative refractive power and a second lens 12 with positive refractive power. The object side and image side of the first lens 11 are both spherical and concave. , the object side and the image side of the second lens 12 are both convex and spherical, the diaphragm 30 is attached to the image side of the second lens 12, and the second lens group 20 has a positive refractive power The third lens 21 is formed...

technical field

[0001] The invention relates to an objective optical system, in particular to an endoscope imaging objective optical system. Background technique

[0002] Endoscope is a kind of medical optical instrument, which is sent into the body from the outside through the natural cavity of the human body to check the diseases in the body. Scanning the film greatly improves the accuracy of cancer diagnosis, and can carry out some minimally invasive surgical treatment.

[0003] In order to alleviate the pain of patients to a greater extent, shorten the recovery time after surgery, reduce the work of doctors, and improve the diagnostic level of visualization and scientific data judgment, it is necessary to further reduce the endoscopic camera system and improve its imaging shooting effect Therefore, it is a technical subject to study and use a larger field of view, smaller and clearer objective lens optical system for endoscopic imaging.

[0004] Chinese patent document...

Examples

Embodiment 1

[0077] Please refer to figure 1 , a camera objective optical system for endoscopy includes a first lens group 10 with positive refractive power, a diaphragm 30, a second lens group 20 with positive refractive power, an optical filter 40, and a flat plate from the object side to the image side Glass 50 and photosensitive surface 60 of the chip. The optical filter 40 is mainly used to cut off a specific wavelength, and the flat glass 50 is mainly used to protect the photosensitive surface 60 of the chip.

[0078] The first lens group 10 is composed of a first lens 11 with negative power and a second lens 12 with positive power. The object side and image side of the first lens 11 are spherical, and the object side is Convex, its image side is concave, the object side and image side of the second lens 12 are both convex and spherical, the second lens group 20 is composed of a third lens 21 with positive refractive power, the third Both the object side and the image side of the l...

Embodiment 2

[0083] Please refer to image 3 , a camera objective optical system for endoscopy includes a first lens group 10 with positive refractive power, a diaphragm 30, a second lens group 20 with positive refractive power, an optical filter 40, and a flat plate from the object side to the image side Glass 50 and photosensitive surface 60 of the chip. The optical filter 40 is mainly used to cut off a specific wavelength, and the flat glass 50 is mainly used to protect the photosensitive surface 60 of the chip.

[0084] The first lens group 10 is composed of a first lens 11 with negative refractive power and a second lens 12 with positive refractive power. The object side of the first lens 11 is a plane, and its image side is spherical and concave. , the object side and the image side of the second lens 12 are both convex and spherical, the diaphragm 30 is attached to the image side of the second lens 12, and the second lens group 20 has a positive refractive power The third lens 21 ...

Embodiment 3

[0090] Please refer to Figure 5 , a camera objective optical system for endoscopy includes a first lens group 10 with positive refractive power, a diaphragm 30, a second lens group 20 with positive refractive power, an optical filter 40, and a flat plate from the object side to the image side Glass 50 and photosensitive surface 60 of the chip. The optical filter 40 is mainly used to cut off a specific wavelength, and the flat glass 50 is mainly used to protect the photosensitive surface 60 of the chip.

[0091] The first lens group 10 is composed of a first lens 11 with negative refractive power and a second lens 12 with positive refractive power. The object side and image side of the first lens 11 are both spherical and concave. , the object side and the image side of the second lens 12 are both convex and spherical, the diaphragm 30 is attached to the image side of the second lens 12, and the second lens group 20 has a positive refractive power The third lens 21 is formed...

Images