CN213365152U

CN213365152U - Lens structure, lens and electronic device

Info

Publication number: CN213365152U
Application number: CN202022318072.4U
Authority: CN
Inventors: 黄怀毅; 吴木源; 李宗政
Original assignee: Jiangxi Oumaisi Microelectronics Co Ltd
Current assignee: Jiangxi Oumaisi Microelectronics Co Ltd
Priority date: 2020-10-16
Filing date: 2020-10-16
Publication date: 2021-06-04
Anticipated expiration: 2030-10-16

Abstract

The utility model discloses a lens structure, a lens and an electronic device, which comprises a lens cone and a lens holder, wherein the lens cone is provided with a cavity; the lens sheet is arranged in the cavity, wherein the lens sheet which is arranged in the lens barrel and is closest to the object side is a first lens; the first lens comprises an optical part and a non-optical part arranged around the optical part, the optical part protrudes towards the object side relative to the non-optical part, and a step is formed at the joint of the optical part and the non-optical part; the first lens satisfies the following conditional expression: ET1 is more than 0.8mm, ET1/TTL is more than 0.16; the utility model discloses a lens structure under the condition of unchangeable F and FOV, sees through the mode of optical design and optimization first camera lens, reduces the opening size, improves the screen and accounts for than.

Description

Lens structure, lens and electronic device

Technical Field

The present disclosure relates to a camera head, and more particularly to a small head lens structure, a lens head and an electronic device with a reduced size of an opening of a screen.

Background

A terminal with a display screen, such as a mobile phone, a watch, a tablet personal computer, a display, wearable equipment and the like, is provided with a front lens, the front lens is placed by breaking or opening the screen, and the rest areas are paved with the screen; with the wide application of full touch screens, the improvement of screen occupation ratio is the key point of the design of each electronic manufacturer at present, so that the requirement of people on full screen is met by reducing the opening size of a small-head lens urgently, and the visual aesthetic feeling and good user experience are increased.

SUMMERY OF THE UTILITY MODEL

The embodiment of the application provides a method for reducing the size of the object side end of a lens barrel by thickening a first lens to form an optical part protruding towards the object side direction under the condition of not changing the number and FOV of a lens, and further reducing the size of an opening under a screen of the lens. The technical scheme is as follows:

according to an embodiment, there is provided a lens structure including: a lens barrel having a cavity; the lens sheet is arranged in the cavity, wherein the lens sheet which is arranged in the lens barrel and is closest to the object side is a first lens; the first lens comprises an optical part and a non-optical part arranged around the optical part, the optical part protrudes towards the object side relative to the non-optical part, and a step is formed at the joint of the optical part and the non-optical part; the first lens satisfies the following conditional expression: ET1 is more than 0.8mm, ET1/TTL is more than 0.16; ET1 is a side thickness of the first lens element, and TTL is an axial distance from an object-side surface of the first lens element to an image plane.

For example, in a lens structure provided in at least one embodiment of the present application, the lens barrel has a stepped structure and is adapted to the step, so that the step is clamped on the stepped structure.

For example, in a lens structure provided by at least one embodiment of the present application, the junction of the optical portion and the non-optical portion is an arc-shaped transition surface, so that the step has a gentle slope.

For example, in a lens structure provided in at least one embodiment of the present application, the junction of the optical portion and the non-optical portion is 90 °, so that the steps are 90 ° steps. For example, in the lens structure provided in at least one embodiment of the present application, the aperture D of the object-side end of the lens barrel is less than or equal to 2.2 mm.

For example, in a lens structure provided in at least one embodiment of the present application, the lens sheet further includes a second lens disposed in the cavity of the lens barrel.

For example, in a lens barrel structure provided in at least one embodiment of the present application, the first lens and the second lens satisfy the following conditional expressions: 2.1< f1/f2<3.1, wherein f1 is the focal length of the first lens and f2 is the focal length of the second lens.

For example, in a lens structure provided in at least one embodiment of the present application, the lens sheet further includes a third lens and a fourth lens disposed in the cavity of the lens barrel; the first lens, the second lens, the third lens and the fourth lens form a movable lens group to realize automatic focusing.

According to an embodiment, a lens includes a diaphragm and the lens structure.

According to an embodiment, an electronic device includes the lens.

Some embodiments of the present application provide a lens structure brings beneficial effects for: under the condition that the given lens specification, namely an F value and an FOV (field of view) is not changed, the first lens is thickened so that the optical part of the first lens protrudes relative to the non-optical part along the object side direction, the connecting part of the optical part and the non-optical part forms a step, the lens barrel is provided with a step-shaped structure matched with the step and can be clamped and fixed on the step, the object side surface of the lens barrel can be directly leaned against the protruding optical part of the first lens without covering the non-optical part of the first lens, the size of the object side end of the lens barrel is reduced, the size of an opening of a screen for the lens is reduced, and the; by limiting the ratio of TTL to the edge ET1 of the first lens, the total lens length is ensured not to be too long while the first lens is thickened, so that the requirement of thin terminal design is met.

Drawings

In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present application, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.

FIG. 1 is a schematic view of a lens structure according to the related art;

FIG. 2 is a schematic view of a lens structure of the present application;

FIG. 3 is a schematic view of a lens optical system according to an embodiment of the present application;

FIG. 4 is a longitudinal aberration diagram of a lens according to an embodiment of the present application;

FIG. 5 is a field curvature diagram of a lens according to an embodiment of the present application;

fig. 6 is a distortion diagram of a lens according to an embodiment of the present application.

Detailed Description

The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.

Unless otherwise defined, technical or scientific terms used herein shall have the ordinary meaning as understood by one of ordinary skill in the art to which this disclosure belongs. The use of "first," "second," and similar terms in this disclosure is not intended to indicate any order, quantity, or importance, but rather is used to distinguish one element from another. The word "comprising" or "comprises", and the like, means that the element or item listed before the word covers the element or item listed after the word and its equivalents, but does not exclude other elements or items. The terms "connected" or "coupled" and the like are not restricted to physical or mechanical connections, but may include electrical connections, whether direct or indirect. "upper", "lower", "left", "right", and the like are used merely to indicate relative positional relationships, and when the absolute position of the object being described is changed, the relative positional relationships may also be changed accordingly.

The present application will be described in detail with reference to specific examples.

Fig. 1 shows a screen hole breaking manner and a common lens structure design manner in the related art, a screen hole breaking size D is limited by a lens outer diameter, since a side thickness ET of a first lens L1 is thin, an optical portion 210 of the first lens L1 and a non-optical portion 220 disposed around the optical portion 210 are almost on a vertical plane, and there is no obvious transition between the optical portion 210 and the non-optical portion 220, so that an object side end of a lens barrel 100 covers an outer surface of the entire first lens L1 and covers the non-optical portion 220, as shown in fig. 1, a display screen is oversized for a lens opening (i.e., D1 in fig. 1), and a screen occupation ratio is affected; in addition, in the related art, the size of the opening is usually reduced by reducing the aperture, i.e. the F value, or enlarging the FOV, but the F and the FOV are limited under the predetermined lens specification, which means that the aperture is not effectively reduced.

In view of the above, a lens structure according to the present application, please refer to fig. 2, which includes: the lens barrel 100 comprises a cavity S, a plurality of lens sheets 200 are accommodated in the cavity S, and the lens sheet 200 arranged on the most object side in the lens barrel 100 is a first lens L1; the first lens L1 comprises an optical part 210 and a non-optical part 220 surrounding the optical part 210, the optical part 210 protrudes towards the object side relative to the non-optical part 220, a step 300 is formed at the joint of the optical part 210 and the non-optical part 220, and the object side end of the lens barrel 100 is clamped on the step 300, so that the object side surface of the lens barrel 100 abuts against the optical part 210; the first lens L1 satisfies the following conditional expression: ET1 is more than 0.8mm, ET1/TTL is more than 0.16;

ET1 is a side thickness of the first lens element L1, where the side thickness specifically refers to a distance in an optical axis direction from a maximum effective aperture of an object-side surface to a maximum effective aperture of an image-side surface of the first lens element L1, and TTL is an optical axis distance from an object-side surface to an image plane of the first lens element L1.

The ET1 is more than 0.8mm to meet the production requirement of the current market, the thickness of the injection molding edge of the current lens is mainly more than 0.2mm, and the thickness of the mechanism bearing edge is also more than 0.2mm, so the ET1 is more than 0.8mm in the design of the application, and enough margin space can be provided for production and manufacturing.

Secondly, in the situation that the TTL of the lens is controlled in the current light and thin design of the mobile phone, that is, the edge thickness ET1 of the first lens L1 is large and the TTL is small, the objective of making the lens head smaller and making the lens shorter can be achieved by limiting ET1/TTL, so as to meet the requirement of a light and thin structure of a terminal with a display screen, such as a mobile phone.

The lens structure of the application can be applied to a mobile phone terminal, and also can be applied to other terminals with display screens, such as watches, tablet computers, displays, wearable equipment and the like.

For example, in a lens structure provided in at least one embodiment of the present application, as shown in fig. 2, the lens barrel 100 has a step-shaped structure and is adapted to the step 300, so that the step 300 is clamped on the step-shaped structure, and the object-side end of the lens barrel 100 only covers the optical portion 210 of the first lens L1, but not covers the non-optical portion 220 of the first lens L1, so as to reduce the size of the object-side end of the lens barrel 100, further reduce the size of the opening of the display screen, and improve the screen ratio.

For example, in the lens structure provided by at least one embodiment of the present application, the junction between the optical portion 210 and the non-optical portion 220 is an arc-shaped transition surface, so that the step has a gentle slope, and the gentle slope step 300 with the arc-shaped transition is more beneficial to the processing and production of the lens.

For example, in the lens structure provided in at least one embodiment of the present application, a joint between the optical portion 210 and the non-optical portion 220 is 90 °, so that the step 300 is a 90 ° step, which is more favorable for the object-side end of the lens barrel 100 to be clamped on the step 300, and the clamping is more tight.

For example, in the lens structure provided in at least one embodiment of the present application, the aperture D of the object-side end of the lens barrel 100 is less than or equal to 2.2mm, where D is 2.2mm, where F is 1.5, F is 2.51, and FOV is 76.5, and the aperture of the object-side end of the lens barrel 100 is less than 2.2mm when a small-aperture lens is selected.

For example, in a lens structure provided in at least one embodiment of the present application, the lens sheet 200 further includes a second lens L2 disposed in the cavity S of the lens barrel 100, and the first lens L1 and the second lens L2 satisfy the following conditional expressions: 2.1< f1/f2<3.1, wherein f1 is the focal length of the first lens L1, and f2 is the focal length of the second lens L2, so as to meet the optical design effect.

For example, in the lens structure provided in at least one embodiment of the present application, the number of lens sheets 200 disposed in the cavity S of the lens barrel 100 is not limited, and may be one sheet, two sheets, three sheets, four sheets, five sheets, six sheets, seven sheets, etc., and only the first lens L1 is required to be designed as the lens structure of the present application.

The application of the lens structure can be used for a split type lens or a periscopic lens, so that the opening size of the lens on the display screen is reduced, and the screen occupation ratio is improved.

For example, in the lens structure provided in at least one embodiment of the present application, as shown in fig. 2, the lens groups are configured to receive light from the object side and transmit the light to the image plane F, the lens sheet 200 includes a third lens L3 and a fourth lens L4 disposed in the cavity S of the lens barrel 100, and each lens includes an object side surface facing the object side and an image side surface facing the image side; the first lens element L1, the second lens element L2, the third lens element L3 and the fourth lens element L4 form a movable lens group, so that auto-focusing can be achieved, and the design of the optical portion 210 of the first lens element L1 protruding in the object-side direction does not affect the auto-focusing function of the lens group.

A second aspect of the present application provides a lens barrel, as shown in fig. 2-3, including a diaphragm and the above-described lens structure.

For example, in a lens barrel provided in at least one embodiment of the present application, the lens sheet 200 disposed in the cavity S of the lens barrel 100 includes: diopters of the first lens L1, the second lens L2, the third lens L3 and the fourth lens L4, diopters of the first lens L1, the second lens L2, the third lens L3 and the fourth lens L4 are positive, negative and positive in sequence, wherein ET1 is 0.95mm, and ET1/TTL is 0.19.

In the related art, the size of the opening at the object side end of the lens barrel 100 is as shown in fig. 1, the object side end of the lens barrel 100 covers the entire outer surface of the first lens L1, covering the range of the non-optical portion 220 of the first lens L1, and the size D1 at the object side end of the lens barrel 100 is 3.44 mm.

With the lens barrel having the lens structure of the present application, under the same aperture (F ═ 1.5), the first lens L1 is designed such that the optical portion 210 of the first lens L1 protrudes from the non-optical portion 220 along the object side direction, the edge thickness ET1 of the first lens L1 is 0.95mm, and ET1/TTL is 0.19, and at this time, the opening size D2 of the object side end of the lens barrel 100 is 2.2mm, which is significantly smaller than D1, and the lens length is limited, so that the requirement of thinning and lightening the terminal with a display screen, such as a tablet computer, a mobile phone, and the like, can be satisfied.

The optical parameters of the lens of the present embodiment are shown in the following table 1 and table 2:

TABLE 1

TABLE 2

The notations shown in the present embodiment have the meanings shown below.

S2, S4, S6, and S8 are numbers of object side surfaces of the first lens L1 to the fourth lens L4, respectively, and S3, S5, S7, and S9 are numbers of image side surfaces of the first lens L1, the second lens L2, the third lens L3, and the fourth lens L4, respectively.

"k" represents a Conic Constant (Constant), "a 4", "a 6", "A8", … … "and" a20 "represent aspheric coefficients of 4 th order, 6 th order, 8 th order, … … and 20 th order, respectively.

In each table showing conic constants and aspherical coefficients below, numerical values are expressed by an index with a base 10. For example, "0.12E-05" means "0.12 × (minus 5 powers of 10)", and "9.87E + 03" means "9.87 × (3 powers of 10)".

In the optical lens group used in each embodiment, specifically, when the distance in the direction perpendicular to the optical axis H is "R", the paraxial curvature at the lens origin is "c" (the paraxial curvature c is the inverse of the upper lens curvature radius R, that is, c is 1/R), the conic constant is "k", and the aspherical coefficients of 4 th order, 6 th order, 8 th order, … …, i th order are "a 4", "a 6", "a 8", … … "and" Ai ", respectively, the aspherical shape x is defined by the following numerical expression.

The mathematical formula is as follows:

fig. 3 shows a lens optical system diagram of the present embodiment.

The optical performance of the lens of this embodiment is shown in fig. 4-6.

The abscissa of the spherical aberration curve represents the focus offset, the ordinate represents the normalized field of view, and the focus offsets of different fields of view are all within ± 0.02mm when the wavelengths given in fig. 4 are 960.000nm, 940.000nm and 920.000nm, respectively, which illustrates that the optical lens assembly in this embodiment has small spherical aberration and good imaging quality.

The abscissa of the astigmatism graph represents focus offset, the ordinate represents image height in mm, and the astigmatism curve shown in fig. 5 represents that the focus offsets of the sagittal image surface and the meridional image surface are within ± 0.05mm when the wavelength is 940.000nm, which indicates that the optical lens assembly in the embodiment has smaller astigmatism and better imaging quality.

The abscissa of the distortion curve graph represents the distortion rate, the ordinate represents the image height in mm, and the distortion curve given by fig. 6 represents that the distortion is within ± 2.5% when the wavelength is 940.000nm, which shows that the distortion of the optical lens group in the embodiment is better corrected and the imaging quality is better.

As can be seen from fig. 4-6, the lens optical lens group provided in this embodiment can achieve good imaging effect.

The lens of the embodiment can be applied to a mobile phone terminal, and also can be applied to other terminals with a display screen, such as watches, tablet computers, displays, wearable devices and the like.

This embodiment of this application utilizes the lens structural design of this application can reach the effect that the opening is little under the screen under the camera lens is big light ring (F1.5) the condition that camera lens opening size itself is big promptly, and satisfies the demand at slim terminal, adopts the lens structural design of this application to little light ring camera lens and more can further reduce the opening size under the screen.

A third aspect of the present application provides an electronic device including the above-described lens to reduce a lens opening size and improve a screen occupation ratio.

Although embodiments of the present application have been disclosed for illustrative purposes, those skilled in the art will recognize that: various modifications, additions and substitutions are possible, without departing from the scope and spirit of the invention as disclosed in the accompanying claims.

Claims

1. A lens structure, comprising:

a lens barrel having a cavity;

the lens sheet is arranged in the cavity, wherein the lens sheet which is arranged in the lens barrel and is closest to the object side is a first lens;

the first lens comprises an optical part and a non-optical part arranged around the optical part, the optical part protrudes towards the object side relative to the non-optical part, and a step is formed at the joint of the optical part and the non-optical part; the first lens satisfies the following conditional expression:

ET1＞0.8mm，ET1/TTL＞0.16；

ET1 is the edge thickness of the first lens element, and TTL is the distance on the optical axis from the object-side surface of the first lens element to the image plane.

2. The lens structure according to claim 1, wherein the lens barrel has a step-shaped structure and is adapted to the step, so that the step is engaged with the step-shaped structure.

3. The lens structure as claimed in claim 2, wherein the junction of the optical portion and the non-optical portion is an arc-shaped transition surface, so that the step has a gentle slope.

4. The lens structure according to claim 2, wherein the junction of the optical portion and the non-optical portion is 90 ° so that the steps are 90 ° steps.

5. The lens structure according to claim 1, wherein a diameter D of the object side end of the lens barrel is less than or equal to 2.2 mm.

6. The lens structure as claimed in claim 1, wherein the lens sheet further includes a second lens disposed in the cavity of the lens barrel.

7. The lens structure according to claim 6, wherein the first lens and the second lens satisfy the following conditional expression:

2.1<f1/f2<3.1，

wherein f1 is the focal length of the first lens, and f2 is the focal length of the second lens.

8. The lens structure as claimed in claim 6, wherein the lens sheet further includes third and fourth lenses disposed in the cavity of the lens barrel; the first lens, the second lens, the third lens and the fourth lens form a movable lens group to realize automatic focusing.

9. A lens barrel comprising a diaphragm and the lens structure according to any one of claims 1 to 8.

10. An electronic device, characterized by comprising the lens barrel according to claim 9.