CN214225561U

CN214225561U - Optical projection lens for observing spherical concave surface suspended in liquid

Info

Publication number: CN214225561U
Application number: CN202120292830.1U
Authority: CN
Inventors: 曲英丽; 朱敏
Original assignee: Nanjing Wavelength Optoelectronics Technology Co Ltd
Current assignee: Nanjing Wavelength Optoelectronics Technology Co Ltd
Priority date: 2021-02-02
Filing date: 2021-02-02
Publication date: 2021-09-17
Anticipated expiration: 2031-02-02

Abstract

The utility model discloses an optical projection lens for observing a spherical concave surface suspended in liquid, which comprises a first lens, a second lens, a third lens, an aperture diaphragm and a fourth lens which are arranged from an image space to an object space in sequence; the first lens, the second lens, the third lens and the fourth lens are all positive lenses; the first lens, the second lens and the third lens are single-lens mirrors; the fourth lens is a cemented lens. The utility model discloses observe the optical projection lens of the concave surface of ball in suspension in liquid, the camera lens can work in the whole visible wave band, the observable diameter range can be up to 14.5mm at most, the observable maximum concave surface depth is 5 mm; the surfaces of all elements are only composed of standard spherical surfaces and planes, so that the structure is simple and the cost is low; the surface and the edge of the concave surface suspended in the liquid can be detected simultaneously, the detection efficiency is improved, the imaging quality is high, and the method can be used for detecting contact lenses and the like.

Description

Optical projection lens for observing spherical concave surface suspended in liquid

Technical Field

The utility model relates to an observe optical projection camera lens of suspension ball concave surface in liquid belongs to concave surface and detects technical field.

Background

In the imaging systems on the market, the observed scene is a plane, however, in industrial applications there are many needs for one-shot imaging of curved surfaces, such as concave surfaces. For example, prior to the final packaging of contact lenses, it is desirable to inspect the surfaces and boundaries for defects. However, because the contact lenses have a certain concavity, the traditional inspection method requires the contact lens image to be projected on a large screen, and the operator needs to touch the contact lens continuously to observe the projection at different depths, which makes the workload huge.

SUMMERY OF THE UTILITY MODEL

The utility model provides an observe optical projection camera lens of suspension ball concave surface in liquid can be to similar suspension diameter in liquid equals to be less than 14.5mm, the concavity equals to be less than 5mm surface and the edge of sphere concave surface carry out the projection formation of image simultaneously, does not need the intervention of other methods such as tomography, has improved the efficiency that detects greatly.

For solving the technical problem, the utility model discloses the technical scheme who adopts as follows:

an optical projection lens for observing a spherical concave surface suspended in liquid comprises a first lens, a second lens, a third lens, an aperture diaphragm and a fourth lens which are sequentially arranged from an image space to an object space; the first lens, the second lens, the third lens and the fourth lens are all positive lenses; the first lens, the second lens and the third lens are single-lens mirrors; the fourth lens is a cemented lens.

The optical projection lens for observing the spherical concave surface suspended in the liquid stretches the field curvature of the system in a secondary imaging mode; meanwhile, the aperture diaphragm is arranged between the two groups of positive lenses, so that dispersion of the whole visible wave band is eliminated, and objects to be measured, such as contact lenses, can be amplified to a projector by using halogen lamp illumination.

In order to further ensure the imaging effect, the first lens is preferably a biconvex H-LAKA lens, the center thickness of the first lens is 12 +/-0.1 mm, the two surfaces of the first lens are a first image side surface and a first object side surface in sequence from the image space to the object space, the curvature of the first image side surface is 46.6 +/-0.01 mm, and the curvature of the first object side surface is-325.3 +/-0.01 mm.

In order to further ensure the imaging effect, the second lens is preferably an H-ZK10L meniscus single lens with positive diopter, the central thickness of the second lens is 11.9 +/-0.1 mm, the two surfaces of the second lens are a second image side surface and a second object side surface in sequence from the image side to the object side, the curvature of the second image side surface is 16.1 +/-0.01 mm, and the curvature of the second object side surface is 178.2 +/-0.01 mm.

In order to further ensure the imaging effect, the third lens is preferably a biconvex H-LAK53A lens with positive diopter, the center thickness of the third lens is 12 +/-0.1 mm, the two surfaces of the third lens are a third image side surface and a third object side surface in sequence from the image side to the object side, the curvature of the third image surface is 41.9 +/-0.01 mm, and the curvature of the third object side surface is-67.5 +/-0.01 mm.

In order to further ensure the imaging effect, preferably, the fourth lens consists of an H-ZK10L/H-ZF72A cemented lens with positive diopter from the image side to the object side, the two surfaces of the H-ZK10L lens are a fourth A image side surface and a fourth A object side surface in sequence, and the two surfaces of the H-ZF72A lens are a fourth B image side surface and a fourth B object side surface in sequence; the side surface of the fourth image A is a convex surface, and the curvature is 31.3 +/-0.01 mm; the side surface of the fourth object A is a convex surface, and the curvature is 10 +/-0.01 mm; the side surface of the fourth B image is a concave surface, and the curvature is 10 +/-0.01 mm; the side surface of the fourth object B is a convex surface, and the curvature is 21.5 +/-0.01 mm; the center thickness of the H-ZK10L lens is 11.8 +/-0.1 mm, and the center thickness of the H-ZF72A lens is 8.5 +/-0.1 mm.

Further preferably, the center interval between the first lens and the second lens is 33.6 ± 0.1 mm; the center interval between the second lens and the third lens is 27.6 +/-0.1 mm; the central interval between the third lens and the aperture diaphragm is 12.3 +/-0.1 mm; the center interval between the aperture stop and the fourth lens is 0 mm.

The optical projection lens for observing the spherical concave surface suspended in the liquid is used for working in all visible light wave bands; the object can be observed with a diameter of at most 14.5mm and a depth of at most 5 mm.

The optical projection lens for observing the spherical concave surface suspended in the liquid consists of two groups of positive focal length lenses, the diaphragm is positioned between the two groups of positive focal length lenses, the object obtained by the first group of lenses is imaged between the two groups of positive focal length lenses and then imaged on the focal plane by the second group of positive focal length lenses, and the depth of field of the lens is stretched; the lens adopts three single lenses and one cemented lens, thereby eliminating the chromatic aberration in the whole visible light range and enabling the utility model lens to be used on a projector with a halogen lamp as a light source. The lens formed by two groups of positive lenses with intermediate imaging can stretch the curvature of field to a greater extent, so that the surface and the edge of a concave surface suspended in liquid can be observed simultaneously.

The technology not mentioned in the present invention refers to the prior art.

The utility model discloses observe the optical projection lens of the concave surface of ball in suspension in liquid, the camera lens can work in the whole visible wave band, the observable diameter range can be up to 14.5mm at most, the observable maximum concave surface depth is 5 mm; the surfaces of all elements are only composed of standard spherical surfaces and planes, so that the structure is simple and the cost is low; the surface and the edge of the concave surface suspended in the liquid can be detected simultaneously, the detection efficiency is improved, the imaging quality is high, and the method can be used for detecting contact lenses and the like.

Drawings

FIG. 1 illustrates the labeling and distance labeling of the optical projection lens components for observing the concave spherical surface suspended in liquid;

FIG. 2 is a diagram showing the labeling and surface labeling of each lens of the optical projection lens of the spherical concave surface suspended in liquid;

FIG. 3 is a schematic cross-sectional view of the optical projection lens for observing a spherical concave surface suspended in a liquid according to the present invention;

FIG. 4 is a schematic view of the cross section of the object to be measured and the light rays when the concave surface of the sphere suspended in the liquid is observed by the optical projection lens of the present invention;

FIG. 5 is a graph showing the MTF curve of the present invention for observing a 14.5mm diameter contact lens with an optical projection lens suspended on a concave spherical surface in a liquid;

fig. 6 is a picture of the optical projection lens of the present invention for observing the concave spherical surface suspended in liquid imaging a contact lens with a diameter of 14.5 mm.

Detailed Description

For a better understanding of the present invention, the following examples are provided to further illustrate the present invention, but the present invention is not limited to the following examples.

As shown in fig. 1-2, the optical projection lens for observing a spherical concave surface suspended in liquid comprises a first lens 1, a second lens 2, a third lens 3, an aperture stop 4 and a fourth lens 5 which are arranged in sequence from an image space to an object space; the first lens 1, the second lens 2, the third lens 3 and the fourth lens 5 are all positive lenses; the first lens 1, the second lens 2 and the third lens 3 are single-chip mirrors; the fourth lens 5 is a cemented lens, and the design parameters of each lens element are shown in table 1.

Table 1 shows the design parameters of the lens elements

In the above table, from the image space to the object space, the two surfaces of the first lens element 1 are the first image-side surface 11 and the first object-side surface 12 in sequence; the two surfaces of the second lens 2 are a second image side surface 21 and a second object side surface 22 in sequence; the third image side surface 31 and the third object side surface 32 are sequentially arranged on the two surfaces of the third lens 3; the fourth lens is composed of an H-ZK10L/H-ZF72A cemented lens with positive diopter, the two surfaces of the H-ZK10L lens are sequentially a fourth A image side surface 51 and a fourth A object side surface 52, and the two surfaces of the H-ZF72A lens are sequentially a fourth B image side surface 53 and a fourth B object side surface 54; in the surface type column, all surfaces are standard type here, which means that only spherical or planar types are included in the lens; a positive value of the radius of curvature means that the corresponding surface is curved in the direction of light propagation (designed optical path), while a negative value means that the corresponding surface is curved in the opposite direction of light propagation (designed optical path); the thickness column indicates the thickness of the element and the distance between adjacent elements; the material column indicates the materials used for the respective elements, here all materials using CDGM; the clear aperture column gives the clear diameter of each element, from which it can be seen that all lenses are the same diameter, 19 mm.

Fig. 1 to 2 show the components of the lens, the distance and the surface of the lens, wherein the lens is composed of four lenses and an aperture stop with adjustable size. The fourth lens 5 is the first element of the projection lens for the light of the measured object, and the input light enters the lens from the measured object through the first element; the lens group of the fourth lens 5 and the third lens 3 images an object with certain height and depth between the third lens 3 and the second lens 2 for the first time, all light rays passing through the fourth lens 5 pass through the aperture stop 4, an intermediate image is imaged on a projector by the second lens 2 and the first lens 1, and the designed magnification is 15 times.

The lens utilizes a secondary imaging mode to stretch the field curvature of a system, simultaneously places an aperture diaphragm between two groups of positive lenses, eliminates dispersion on the whole visible wave band, and can utilize a halogen lamp for illumination to amplify a detected object such as a contact lens and the like onto a projector. The schematic cross-sectional view of the lens when used to observe a concave surface suspended in a liquid is shown in fig. 3, the schematic cross-sectional view of a measured object and light is shown in fig. 4, the MTF is shown in fig. 5, and the image of a contact lens with a diameter of 14.5mm is shown in fig. 6.

It is specifically intended that the scope of the present application not be limited to the details of the foregoing disclosure, and that the pupil be closely attached to the front surface of the fourth lens by three einzel lenses and a set of cemented lenses, with intermediate imaging and corresponding material selection, and that any modifications and variations on this structure are within the scope of the present invention.

Claims

1. An optical projection lens for observing a spherical concave surface suspended in liquid, characterized in that: the lens comprises a first lens, a second lens, a third lens, an aperture diaphragm and a fourth lens which are arranged in sequence from an image space to an object space; the first lens, the second lens, the third lens and the fourth lens are all positive lenses; the first lens, the second lens and the third lens are single-lens mirrors; the fourth lens is a cemented lens.

2. An optical projection lens for viewing the concave surface of a sphere suspended in a liquid as claimed in claim 1, wherein: the first lens is a biconvex H-LAKA lens, the center thickness of the first lens is 12 +/-0.1 mm, from an image space to an object space, the two surfaces of the first lens are a first image side surface and a first object side surface in sequence, the curvature of the first image side surface is 46.6 +/-0.01 mm, and the curvature of the first object side surface is-325.3 +/-0.01 mm.

3. An optical projection lens for viewing the concave surface of a sphere suspended in a liquid as claimed in claim 1 or 2, wherein: the second lens is an H-ZK10L meniscus single lens with positive diopter, the center thickness of the second lens is 11.9 +/-0.1 mm, the two surfaces of the second lens are a second image side surface and a second object side surface in sequence from an image space to an object space, the curvature of the second image side surface is 16.1 +/-0.01 mm, and the curvature of the second object side surface is 178.2 +/-0.01 mm.

4. An optical projection lens for viewing the concave surface of a sphere suspended in a liquid as claimed in claim 1 or 2, wherein: the third lens is a biconvex H-LAK53A lens with positive diopter, the center thickness of the third lens is 12 +/-0.1 mm, the third image side surface and the third object side surface are sequentially arranged on the two surfaces of the third lens from the image space to the object space, the curvature of the third image side surface is 41.9 +/-0.01 mm, and the curvature of the third object side surface is-67.5 +/-0.01 mm.

5. An optical projection lens for viewing the concave surface of a sphere suspended in a liquid as claimed in claim 1 or 2, wherein: from an image space to an object space, the fourth lens is composed of an H-ZK10L/H-ZF72A cemented lens with positive diopter, two surfaces of the H-ZK10L lens are a fourth image side surface A and a fourth object side surface A in sequence, and two surfaces of the H-ZF72A lens are a fourth image side surface B and a fourth object side surface B in sequence; the side surface of the fourth image A is a convex surface, and the curvature is 31.3 +/-0.01 mm; the side surface of the fourth object A is a convex surface, and the curvature is 10 +/-0.01 mm; the side surface of the fourth B image is a concave surface, and the curvature is 10 +/-0.01 mm; the side surface of the fourth object B is a convex surface, and the curvature is 21.5 +/-0.01 mm; the center thickness of the H-ZK10L lens is 11.8 +/-0.1 mm, and the center thickness of the H-ZF72A lens is 8.5 +/-0.1 mm.

6. An optical projection lens for viewing the concave surface of a sphere suspended in a liquid as claimed in claim 1 or 2, wherein: the central interval between the first lens and the second lens is 33.6 +/-0.1 mm; the center interval between the second lens and the third lens is 27.6 +/-0.1 mm; the central interval between the third lens and the aperture diaphragm is 12.3 +/-0.1 mm; the center interval between the aperture stop and the fourth lens is 0 mm.

7. An optical projection lens for viewing the concave surface of a sphere suspended in a liquid as claimed in claim 1 or 2, wherein: for operating in all visible light bands; the object can be observed with a diameter of at most 14.5mm and a depth of at most 5 mm.