CN115145004A - Combined lens group and lens - Google Patents

Abstract

The invention relates to the technical field of lens design, in particular to a combined lens group and a lens, wherein the combined lens group comprises a first lens group, a second lens group, a third lens group, a fourth lens group and a fifth lens group which are sequentially arranged along an incident light path; the first lens group is a lens with negative focal power, the second lens group is a lens with positive focal power, the third lens group is a lens with negative focal power, the fourth lens group is a lens with positive focal power, and the fifth lens group is a lens with negative focal power. The lens is mainly used in AOI equipment, utilizes the long back focus to provide high magnification to detect the defects on the surface of the crystal, and has the characteristics of small chromatic aberration and distortion and high detection precision.

Description

Combined lens group and lens

Technical Field

The invention relates to the technical field of lens design, in particular to a combined lens group and a lens.

Background

With the development of multimedia technology, electronic products with functions of photographing or optical vision detection are more and more favored by consumers, and for example, video cameras and AOI devices for detecting defects on crystal surfaces have become high-precision products widely used in people's life and industrial applications. Wherein the optical lens in the AOI device is an important structure for imaging.

The existing optical lens has the following defects: 1. the lenses adopted by the existing large-aperture photography are basically divided into spherical lenses and aspheric lenses, the spherical lenses are used for large-aperture lenses, the aberration and deformation of the optical wide-angle lenses are large, the imaging effect is poor, the cost of the aspheric lenses is very high, and the production technology is basically monopolized abroad; 2. most of the existing standard lenses adopt an integral moving focusing or front group focusing mode, and the phenomenon of head hanging easily occurs by adopting the integral moving focusing or front group focusing mode; 3. the serious 'breathing effect' can occur when the photographic lens on the market is used for recording, the breathing effect can change the visual angle when continuously focusing, the mainstream method for eliminating the breathing effect at present is a multi-group moving focusing mode, but the requirements of the multi-group moving focusing mode on the structural design, the mechanical processing and the assembly precision are very high, and the domestic processing level at present cannot be met; 4. when the aperture ratio is large, the optical element and the optical diaphragm on the image plane side are likely to be large in the radial direction, and the arrangement of the refractive power of the wide-angle optical system is asymmetric in the front-rear direction, which tends to cause vertical axis chromatic aberration and distortion.

Disclosure of Invention

The invention provides a combined lens group and a lens, which solve the technical problem that the chromatic aberration and distortion of the lens cannot be solved.

The present invention provides a combined lens set for solving the above technical problems, comprising: a first lens group, a second lens group, a third lens group, a fourth lens group and a fifth lens group which are sequentially arranged along an incident light path;

the first lens group is a lens with negative focal power, the second lens group is a lens with positive focal power, the third lens group is a lens with negative focal power, the fourth lens group is a lens with positive focal power, and the fifth lens group is a lens with negative focal power.

Preferably, the first lens group comprises a aplanatic lens for reducing spherical aberration, enlarging a field of view and increasing incident light.

Preferably, the second lens group includes a second lens, a third lens, a fourth lens, a fifth lens, and a sixth lens arranged in this order along the incident light path.

Preferably, the third lens group includes a seventh lens and an eighth lens arranged in order along an incident light path.

Preferably, the fourth lens group includes a ninth lens, a tenth lens and an eleventh lens sequentially arranged along an incident light path, and the ninth lens, the tenth lens and the eleventh lens are all cemented lenses for balancing chromatic aberration and spherical aberration of the third lens group and the fifth lens group.

Preferably, the fifth lens group includes a twelfth lens for correcting curvature of field.

Preferably, a diaphragm for correcting curvature of field to optimize the fringe field of view is disposed between the third lens group and the fourth lens group.

Preferably, the first lens group, the second lens group, the third lens group, the fourth lens group and the fifth lens group are coaxially disposed.

The invention also provides a lens barrel, which comprises the combined lens group;

the lens further comprises a lens barrel, a containing cavity is arranged in the lens barrel, and the combined lens group is fixed in the containing cavity.

Has the advantages that: the invention provides a combined lens group and a lens, wherein the combined lens group comprises a first lens group, a second lens group, a third lens group, a fourth lens group and a fifth lens group which are sequentially arranged along an incident light path; the first lens group is a lens with negative focal power, the second lens group is a lens with positive focal power, the third lens group is a lens with negative focal power, the fourth lens group is a lens with positive focal power, and the fifth lens group is a lens with negative focal power. The lens is mainly used in AOI equipment, utilizes the long back focus to provide high magnification to detect the defects on the surface of the crystal, and has the characteristics of small chromatic aberration and distortion and high detection precision.

The foregoing description is only an overview of the technical solutions of the present invention, and in order to make the technical solutions of the present invention more clearly understood and to make the technical solutions of the present invention practical in accordance with the contents of the specification, the following detailed description is given of preferred embodiments of the present invention with reference to the accompanying drawings. The detailed description of the present invention is given in detail by the following examples and the accompanying drawings.

Drawings

The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the invention and together with the description serve to explain the invention without limiting the invention. In the drawings:

FIG. 1 is a schematic diagram of the structure of the combined lens set of the present invention.

Description of reference numerals:

the lens system comprises a first lens 1, a second lens 2, a third lens 3, a fourth lens 4, a fifth lens 5, a sixth lens 6, a seventh lens 7, an eighth lens 8, a ninth lens 9, a tenth lens 10, an eleventh lens 11, a twelfth lens 12 and an aperture stop 13.

Detailed Description

The principles and features of this invention are described below in conjunction with the following drawings, which are set forth by way of illustration only and are not intended to limit the scope of the invention. The invention is described in more detail in the following paragraphs by way of example with reference to the accompanying drawings. Advantages and features of the present invention will become apparent from the following description and from the claims. It is to be noted that the drawings are in a very simplified form and are not to precise scale, which is merely for the purpose of facilitating and distinctly claiming the embodiments of the present invention.

It will be understood that when an element is referred to as being "secured to" another element, it can be directly on the other element or intervening elements may also be present. When a component is referred to as being "connected" to another component, it can be directly connected to the other component or intervening components may also be present. When a component is referred to as being "disposed on" another component, it can be directly on the other component or intervening components may also be present. The terms "vertical," "horizontal," "left," "right," and the like as used herein are for illustrative purposes only.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.

As shown in fig. 1, the present invention provides a combined lens group and a lens barrel, wherein the combined lens group includes a first lens group, a second lens group, a third lens group, a fourth lens group and a fifth lens group, which are sequentially arranged along an incident light path; the first lens group is a lens with negative focal power, the second lens group is a lens with positive focal power, the third lens group is a lens with negative focal power, the fourth lens group is a lens with positive focal power, and the fifth lens group is a lens with negative focal power. The lens is mainly used in AOI equipment, utilizes the long back focus to provide high magnification to detect the defects on the surface of the crystal, and has the characteristics of small chromatic aberration and distortion and high detection precision.

Preferably, the first lens group includes a aplanatic lens for reducing spherical aberration, enlarging a field of view, and adding incident light. The zimmin lens is the first lens 1 shown in fig. 1. The spherical aberration is reduced, the visual field is enlarged, and the incidence is increased.

Preferably, the second lens group includes a second lens 2, a third lens 3, a fourth lens 4, a fifth lens 5, and a sixth lens 6, which are arranged in this order along the incident light path. Used for correcting the chromatic aberration generated by the first group and compensating the spherical aberration and the chromatic aberration generated by the third group.

Preferably, the third lens group includes a seventh lens 7 and an eighth lens 8 arranged in sequence along the incident light path. Used for correcting coma aberration generated by the second lens group and compensating distortion of the first lens group.

Preferably, the fourth lens group includes a ninth lens 9, a tenth lens 10 and an eleventh lens 11 sequentially arranged along the incident light path, and the ninth lens 9, the tenth lens 10 and the eleventh lens 11 are all cemented lenses for balancing chromatic aberration and spherical aberration of the third lens group and the fifth lens group. For balancing the chromatic and spherical aberration produced by the third and fifth sets.

Preferably, the fifth lens group includes a twelfth lens 12 for correcting curvature of field. For correcting curvature of field.

Further, the surface sizes of the first lens 1, the second lens 2, the third lens 3, the fourth lens 4, the fifth lens 5, the sixth lens 6, the seventh lens 7, the eighth lens 8, the ninth lens 9, the tenth lens 10, the eleventh lens 11, and the twelfth lens 12 are as follows:

preferably, a diaphragm for correcting curvature of field to optimize the fringe field of view is disposed between the third lens group and the fourth lens group. The diaphragm is moved backwards and the curvature of field is corrected to optimize the marginal field of view. And a sixth lens 6, a seventh lens 7, an eighth lens 8 and a ninth lens 9 are added to reduce the speckle and optimize the marginal field of view.

Preferably, the first lens group, the second lens group, the third lens group, the fourth lens group and the fifth lens group are coaxially arranged.

The embodiment of the invention also provides a lens, which comprises the combined lens group; the lens further comprises a lens barrel, a containing cavity is arranged in the lens barrel, and the combined lens group is fixed in the containing cavity. The lens is mainly used in AOI equipment, and crystal surface flaw detection is carried out by utilizing a long back focus to provide higher magnification.

The foregoing is merely a preferred embodiment of the invention and is not intended to limit the invention in any manner; the present invention may be readily implemented by those of ordinary skill in the art as illustrated in the accompanying drawings and described above; however, those skilled in the art should appreciate that they can readily use the disclosed conception and specific embodiments as a basis for designing or modifying other structures for carrying out the same purposes of the present invention without departing from the scope of the invention as defined by the appended claims; meanwhile, any changes, modifications, and evolutions of the equivalent changes of the above embodiments according to the actual techniques of the present invention are still within the protection scope of the technical solution of the present invention.

Claims (9)

1. A combined lens group, comprising: a first lens group, a second lens group, a third lens group, a fourth lens group and a fifth lens group which are sequentially arranged along an incident light path;

the first lens group is a lens with negative focal power, the second lens group is a lens with positive focal power, the third lens group is a lens with negative focal power, the fourth lens group is a lens with positive focal power, and the fifth lens group is a lens with negative focal power.

2. The combination lens group of claim 1, wherein the first lens group comprises a aplanatic lens for reducing spherical aberration, enlarging a field of view, and adding light.

3. The combined lens group of claim 1, wherein the second lens group comprises a second lens, a third lens, a fourth lens, a fifth lens, and a sixth lens arranged in that order along an incident light path.

4. The combined lens group of claim 1, wherein the third lens group comprises a seventh lens and an eighth lens arranged in sequence along an incident light path.

5. The combined lens group of claim 1, wherein the fourth lens group comprises a ninth lens, a tenth lens and an eleventh lens arranged in sequence along an incident light path, and the ninth lens, the tenth lens and the eleventh lens are all cemented lenses for balancing chromatic aberration and spherical aberration of the third lens group and the fifth lens group.

6. The combined lens group according to claim 1, wherein the fifth lens group comprises a twelfth lens for correcting curvature of field.

7. The combined lens group of claim 1, wherein a stop is disposed between the third lens group and the fourth lens group to correct curvature of field to optimize marginal field of view.

8. The combined lens group of claim 1, wherein the first lens group, the second lens group, the third lens group, the fourth lens group, and the fifth lens group are coaxially disposed.

9. A lens barrel comprising the combined lens group according to any one of claims 1 to 8;

the lens further comprises a lens barrel, a containing cavity is arranged in the lens barrel, and the combined lens group is fixed in the containing cavity.

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