CN202305973U

CN202305973U - Wide-angle object lens of electronic endoscope

Info

Publication number: CN202305973U
Application number: CN2011203964763U
Authority: CN
Inventors: 王立强
Original assignee: HANGZHOU SHOUTIAN PHOTOELECTRIC TECHNOLOGY Co Ltd
Current assignee: HANGZHOU SHOUTIAN PHOTOELECTRIC TECHNOLOGY Co Ltd
Priority date: 2011-10-18
Filing date: 2011-10-18
Publication date: 2012-07-04
Anticipated expiration: 2021-10-18

Abstract

The utility model relates to a wide-angle object lens of an electronic endoscope. The wide-angle object lens of the electronic endoscope includes five pieces of spherical glass lenses assembled on the same optical axis and arranged successively from an object end to an image end. One face of the first lens facing the object end is plane while the other face of the first lens facing the image end is concave. One face of the second lens facing the object end is concave while the other face of the second lens facing the image is convex. One face of the third lens facing the object end is concave while the other face of the third lens facing the image end is convex. The fourth lens and the fifth lens form a glued lens group. One face of the fourth lens facing the object end is convex while the other face of the fourth lens facing the image end is concave. One face of the fifth lens facing the object lens is concave while the other face of the fifth lens facing the image end is concave. The convex face of the fourth lens facing the image end and the concave face of the fifth lens facing the object end are glued together. The wide-angle object lens of the electronic endoscope in the utility model can realize internal image formation having high resolution, and has characteristics of large vision angle, high resolution, small size, advanced processing technique, low cost and the like.

Description

A kind of fujinon electronic video endoscope wide-angle lens

Technical field

The utility model relates to a kind of fujinon electronic video endoscope wide-angle lens, particularly relates to the wide-angle lens of electronic gastroscope and intestines mirror.

Background technology

Fujinon electronic video endoscope has become the essential equipment that the interior pathology of body is sought and visited diagnosis and Minimally Invasive Surgery, in clinical medical every field widespread use, on the diagnosis disease of digestive tract, has irreplaceable effect especially.

The angle that fujinon electronic video endoscope is observed is big more, and image resolution ratio is high more, and the retrievable information of doctor is just many more, and the medical diagnosis on disease accuracy is just high more, and Diagnostic Time is also just short more.Therefore, the object lens of wide-angle, high resolution are one of critical components of fujinon electronic video endoscope.Present electric endoscope lens field angle is about 120 °, and the imageing sensor that is used with it is 440,000 pixels, and each Pixel Dimensions is more than 3 microns, and therefore lower to the requirement of object lens, its visual field, center resolving power is below 100 lp/mm.Along with development of technology, the aspheric surface object lens of 140 ° of field angle occurred, and the pixel count of the imageing sensor that is used with it is more than 1,000,000 pixels, each Pixel Dimensions is 1.75 microns, even 1.4 microns.This moment is higher to the resolving power requirement of object lens, and traditional object lens can't meet the demands.

At this moment, can adopt aspheric surface object lens, generally have the above aspherical lens of a slice at least; Compare general spheric glass, though field angle and resolution have certain improvement, mostly aspherical lens is glass lens; With the medical biotechnology compatibility certain difference is arranged; And can't repeatedly sterilize, and the production technology of glass aspherical lens is difficult, cost is high.

Summary of the invention

The purpose of the utility model provides and a kind ofly realizes 140 ° of wide-angles, 200 lp/mm high resolution, all is the fujinon electronic video endoscope wide-angle lens of spheric glass.

For achieving the above object, the fujinon electronic video endoscope wide-angle lens of the utility model comprises five spherical glass lens of the shaft device of sharing the same light, and is arranged in order from object space to picture side:

First lens face is the plane to object space, is concave surface towards picture side;

Second lens face is a concave surface to object space, is convex surface towards picture side;

The 3rd lens face is a concave surface to object space, is convex surface towards picture side;

Four, the 5th lens are the balsaming lens group, and wherein the 4th lens face is a convex surface to object space, are convex surface towards picture side; The 5th lens face is a concave surface to object space, is concave surface towards picture side, and the 4th lens face is glued together to the concave surface of object space to the convex surface and the 5th lens face of picture side.

Above-mentioned five lens have nine minute surfaces, and the plane of first lens is first minute surface, and the concave surface of first lens is second minute surface; The concave surface of second lens is the 3rd minute surface; The convex surface of second lens is the 4th minute surface, and the concave surface of the 3rd lens is the 5th minute surface, and the convex surface of the 3rd lens is the 6th minute surface; The 4th lens face is the 7th minute surface to the convex surface of object space; The cemented surface of the 4th lens and the 5th lens is the 8th minute surface, and the 5th lens face is the 9th minute surface to the concave surface of picture side, and the structural parameters of nine minute surfaces are seen table 1:

Minute surface number	Radius-of-curvature (mm)	Minute surface distance (mm)	Minute surface radius (mm)	Glass material
					1	R1=∞	D1=0.51	1.8	SILICA
2	R2=1.3	D2=1.82	1.025	?
					3	R3=-2.421	D3=0.7	0.525	LAK7_CHINA
4	R4=-1.3	D4=0.15	1.088	?
					5	R5=-47.619	D5=0.7	0.962	LAK7_CHINA
6	R6=-3.373	D6=0.15	1.088	?
					7	R7=4.207	D7=1.2	1.171	LAK3_CHINA
8	R8=-2.073	D8=0.35	1.171	SF57-SCHOTT
					9	R9=3.356	D9=0.8	1.154	?

The fujinon electronic video endoscope wide-angle lens of the utility model all adopts spheric glass, and is compatible fully with existing optical mirror slip processing and characterization processes; Low cost of manufacture, and under the structural parameters of nine minute surfaces that the utility model provides, the field of view angle of object lens can reach 140 ° of wide-angles; And the resolution of visual field, 0 ° of center is issued to 200 lp/mm at MTF greater than 0.2 condition; Even when 140 ° of wide-angles, its MTF is under greater than 0.2 condition, still near 100 lp/mm.Be applicable to the imageing sensor below 1.75 microns Pixel Dimensions fully, can significantly promote the imaging performance of fujinon electronic video endoscope.

Description of drawings

Fig. 1 is the structural representation of the fujinon electronic video endoscope wide-angle lens of the utility model.

Fig. 2 is visual field, the 0 ° of center optical transfer function figure of the fujinon electronic video endoscope wide-angle lens of the utility model.

Fig. 3 is 140 ° of peripheral visual field optical transfer function figure of the fujinon electronic video endoscope wide-angle lens of the utility model.

Embodiment

Further specify the utility model below in conjunction with accompanying drawing.

With reference to Fig. 1, the fujinon electronic video endoscope wide-angle lens of the utility model comprises five spherical glass lens of the shaft device of sharing the same light, and is arranged in order from object space to picture side:

The first lens L1 is the plane towards object space, is concave surface towards picture side;

The second lens L2 is a concave surface towards object space, is convex surface towards picture side;

The 3rd lens L3 is a concave surface towards object space, is convex surface towards picture side;

Four, the 5th lens L4, L5 are the balsaming lens group, and wherein the 4th lens L4 is a convex surface towards object space, are convex surface towards picture side; The 5th lens L5 is a concave surface towards object space, is concave surface towards picture side, and the 4th lens L4 is glued together towards the concave surface of object space towards the convex surface and the 5th lens L5 of picture side.

Above-mentioned five lens have nine minute surfaces, and the plane of the first lens L1 is first minute surface, and the concave surface of the first lens L1 is second minute surface; The concave surface of the second lens L2 is the 3rd minute surface; The convex surface of the second lens L2 is the 4th minute surface, and the concave surface of the 3rd lens L3 is the 5th minute surface, and the convex surface of the 3rd lens L3 is the 6th minute surface; The 4th lens L4 is the 7th minute surface towards the convex surface of object space; The cemented surface of the 4th lens L4 and the 5th lens L5 is the 8th minute surface, and the 5th lens L5 is the 9th minute surface towards the concave surface of picture side, and the structural parameters of nine minute surfaces are:

Fig. 2 and Fig. 3 have calculated 0 ° (visual field, center) in the normalization coordinate, the transfer function values of 140 ° of (peripheral visual field) two visual fields altogether.Optical transfer function figure by Fig. 2 and Fig. 3 is visible, is 0.20 o'clock in transfer function values, and the transfer function values of two visual fields in visual field, center and peripheral visual field can reach the resolution of 200lp/mm and 100 lp/mm.The fujinon electronic video endoscope wide-angle lens that shows the utility model can be realized big visual field, high-resolution imaging.

Claims

1. fujinon electronic video endoscope wide-angle lens is characterized in that: comprise five spherical glass lens of the shaft device of sharing the same light, be arranged in order from object space to picture side:

First lens (L1) are the plane towards object space, are concave surface towards picture side;

Second lens (L2) are concave surface towards object space, are convex surface towards picture side;

The 3rd lens (L3) are concave surface towards object space, are convex surface towards picture side;

Four, the 5th lens (L4, L5) are the balsaming lens group, and wherein the 4th lens (L4) are convex surface towards object space, are convex surface towards picture side; The 5th lens (L5) are concave surface towards object space, are concave surface towards picture side, and the 4th lens (L4) are glued together towards the concave surface of object space towards the convex surface and the 5th lens (L5) of picture side.

2. fujinon electronic video endoscope wide-angle lens according to claim 1; It is characterized in that: above-mentioned five lens have nine minute surfaces, and the plane of first lens (L1) is first minute surface, and the concave surface of first lens (L1) is second minute surface; The concave surface of second lens (L2) is the 3rd minute surface; The convex surface of second lens (L2) is the 4th minute surface, and the concave surface of the 3rd lens (L3) is the 5th minute surface, and the convex surface of the 3rd lens (L3) is the 6th minute surface; The 4th lens (L4) are the 7th minute surface towards the convex surface of object space; The cemented surface of the 4th lens (L4) and the 5th lens (L5) is the 8th minute surface, and the 5th lens (L5) are the 9th minute surface towards the concave surface of picture side, and the structural parameters of nine minute surfaces are seen table 1:

Table 1

。