CN207336903U

CN207336903U - Endoscope lens

Info

Publication number: CN207336903U
Application number: CN201721096598.4U
Authority: CN
Inventors: 马韬
Original assignee: Changzhou Somic Photoelectric Technology Co Ltd
Current assignee: Changzhou Somic Photoelectric Technology Co Ltd
Priority date: 2017-08-30
Filing date: 2017-08-30
Publication date: 2018-05-08
Anticipated expiration: 2027-08-30

Abstract

The utility model provides a kind of endoscope lens, including the first lens, the second lens, diaphragm, the 3rd lens, the 4th lens and the parallel flat set gradually from an object side, first lens, the second lens, diaphragm, the 3rd lens, the 4th lens and parallel flat are set using air to be spaced apart, first lens, the second lens, the 3rd lens and the 4th lens are spherical lens and diameter is equal, first lens are plano-concave lens, second lens are planar lens, and the 3rd lens and the 4th lens are planoconvex spotlight.The endoscope lens of the utility model use separated spherical lens, and lens construction is compact, can obtain more preferably image quality, and lens diameter used in endoscope lens is identical, reduces processing cost, also allows for installation and debugging.

Description

Endoscope lens

Technical field

Endoscopic technique field is the utility model is related to, especially, is related to a kind of endoscope lens.

Background technology

Medical endoscope is the precision instrument that a kind of Light Electrical is combined, to observe human eye cannot directly observe or not side Just the cavity inner tissue observed and structure, and combine association area and carry out diagnose and treat.Reduced to mitigate the pain of patient Medical treatment cost, medical endoscope gradually develop to miniaturization, cost degradation direction.

The field angle of endoscope lens is typically larger than 100 °, belongs to ultra-wide angle optical system, before most of endoscope Head usually can all use cemented doublet or non-spherical lens for the various aberrations of correction system, this can cause endoscope lens Difficulty of processing and cost increase.

Utility model content

Based on this, it is necessary to provide a kind of endoscope lens using sphere dialyte lens.

The utility model solves its technical problem technical solution to be taken：A kind of endoscope lens, including from thing The first lens, the second lens, diaphragm, the 3rd lens, the 4th lens and the parallel flat set gradually is acted in side, and described first is saturating Mirror, second lens, the diaphragm, the 3rd lens, the 4th lens and the parallel flat are using air between Every separately positioned, first lens, second lens, the 3rd lens and the 4th lens be spherical lens and Diameter is equal, and first lens are plano-concave lens, and second lens are planar lens, the 3rd lens and the described 4th Lens are planoconvex spotlight.

Further, the concave surface of first lens is towards image side surface.

Further, the front surface of second lens and rear surface are plane.

Further, the 3rd lens convex surface facing image side surface.

Further, the 4th lens convex surface facing thing side.

Further, the concave edge of first lens is in contact with the front surface of second lens, and described second The rear surface of lens is in contact with the front surface of the 3rd lens, convex surface vertex and the 3rd lens of the 4th lens Convex surface vertex be in contact.

The beneficial effects of the utility model are：The endoscope lens of the utility model use separated spherical lens, camera lens It is compact-sized, more preferably image quality can be obtained, lens diameter used in endoscope lens is identical, reduces processing cost, It is easily installed debugging.

Brief description of the drawings

The utility model is described in further detail with reference to the accompanying drawings and examples.

Fig. 1 is a kind of structure diagram of endoscope lens of the present invention；

Fig. 2 is a kind of light path schematic diagram of endoscope lens of the present invention；

Fig. 3 is a kind of modulation transfer function of endoscope lens (MTF) figure of the present invention；

Fig. 4 is the present invention a kind of curvature of field and distortion figure of endoscope lens.

Parts title and its numbering are respectively in figure：

L1. the first lens；L2. the second lens；L3. the 3rd lens；L4. the 4th lens；1. diaphragm；2. parallel flat.

Embodiment

The utility model is described in detail presently in connection with attached drawing.This figure is simplified schematic diagram, only in a schematic way Illustrate the basic structure of the utility model, therefore it only shows the composition related with the utility model.

As shown in Figure 1, the utility model provides a kind of endoscope lens, including first set gradually from an object side is saturating Mirror L1, the second lens L2, diaphragm 1, the 3rd lens L3, the 4th lens L4 and parallel flat 2.

First lens L1 is plano-concave lens, and the concave surface of the first lens L1 is towards image side surface.

Second lens L2 is planar lens, and the front surface and rear surface of the second lens L2 are plane.

3rd lens L3 is planoconvex spotlight, the 3rd lens L3 convex surface facing image side surface.

4th lens L4 is planoconvex spotlight, the 4th lens L4 convex surface facing thing side.

The concave edge of first lens L1 is in contact with the front surface of the second lens L2, the rear surface of the second lens L2 and the The front surface of three lens L3 is in contact, and the convex surface vertex of the 4th lens L4 is in contact with the convex surface vertex of the 3rd lens L3, and first Lens L1, the second lens L2, diaphragm 1, the 3rd lens L3, the 4th lens L4 and parallel flat 2 are set using air to be spaced apart Put so that whole lens construction is compact, and the first lens L1, the second lens L2, the 3rd lens L3 and the 4th lens L4 are sphere Lens and diameter is equal, disclosure satisfy that the endoscope lens demand of big visual field, miniaturization, low cost.

It is 4 that the endoscope lens full filed angle of the utility model, which is 120 degree, camera lens aperture 1mm, camera lens F#, working distance From for 10mm, i.e. distance of the object plane away from the first lens L1 front surfaces R1 along optical axis direction is 10mm.

As shown in Fig. 2, being the light path schematic diagram of endoscope lens, light enters the first lens with 60 degree of angle of half field-of view L1, after the second lens L2, by diaphragm 1, parallel flat 2 is incided after the 3rd lens L3 and the 4th lens L4.

As shown in table 1, it is a kind of design parameter value of each piece of lens of endoscope lens of the present invention, wherein " surface " one Column gives each piece of lens surface reference numeral；" radius " column gives the spherical radius corresponding to each surface；It is " thick A degree/spacing " column gives the axial distance between adjacent surface, if two surface belongs to same lens, thickness value table Show the lens thickness, otherwise expression thing/image planes to spacing between lens distance or adjacent lens；" semiaperture " column give pair Answer 1/2 aperture value on surface.

By taking lens L1 as an example, the spherical radius of the front surface R1 of L1 is Infinity, is plane, the front surface R1 of L1 is partly Aperture is 0.5mm, and the distance of front surface R1 to the object plane of L1 is 10mm, the spherical radius of the rear surface R2 of L1 and semiaperture difference For 1.09mm and 0.35mm, the center thickness of distance, that is, L1 of the front surface R1 to rear surface R2 of L1 is 0.2mm, i.e. L1 is plano-concave Lens and concave surface are towards image planes side.

1 lens design data of table

Modulation transfer function (MTF) figure of the endoscope lens image planes of the utility model is illustrated in figure 3, locates peripheral field Outside, the transfer curve of each visual field is approached with diffraction limit shown in figure, has good image quality.

Fig. 4 show the curvature of field and distortion figure of the endoscope lens image planes of this utility model, and book is practical as seen from the figure New curvature of the image meets image quality requirement within 0.05mm, and under large viewing field condition, 45% distortion is also full Sufficient requirement.

Using the above-mentioned desirable embodiment according to the utility model as enlightenment, by above-mentioned description, relevant work Personnel can carry out various changes and amendments in without departing from the scope of the utility model completely.This item utility model Technical scope is not limited to the content on specification, it is necessary to determines its technical scope according to right.

Claims

A kind of 1. endoscope lens, it is characterised in that：Including set gradually from an object side the first lens, the second lens, diaphragm, 3rd lens, the 4th lens and parallel flat, first lens, second lens, the diaphragm, the 3rd lens, 4th lens and the parallel flat are set using air to be spaced apart, first lens, second lens, institute To state the 3rd lens and the 4th lens are spherical lens and diameter is equal, first lens are plano-concave lens, described Two lens are planar lens, and the 3rd lens and the 4th lens are planoconvex spotlight.
2. endoscope lens as claimed in claim 1, it is characterised in that：The concave surface of first lens is towards image side surface.
3. endoscope lens as claimed in claim 2, it is characterised in that：The front surface and rear surface of second lens be Plane.
4. endoscope lens as claimed in claim 3, it is characterised in that：3rd lens convex surface facing image side surface.
5. endoscope lens as claimed in claim 4, it is characterised in that：4th lens convex surface facing thing side.
6. endoscope lens as claimed in claim 5, it is characterised in that：The concave edge of first lens and described second The front surface of lens is in contact, and the rear surface of second lens is in contact with the front surface of the 3rd lens, and the described 4th The convex surface vertex of lens is in contact with the convex surface vertex of the 3rd lens.