An inner focusing imaging lens

Abstract

The application discloses an inner focusing imaging lens, comprising: a lens barrel, a lens set and at least one light shielding element arranged in the lens barrel; the lens set is coaxially arranged with the lens barrel; the lens set at least comprises a lens provided with petal-shaped support arms on the outside; and the petal-shaped support arms are arranged at the hollowed-out part of the lens barrel. Through the technical scheme of the inner focusing imaging lens disclosed by the application, the petal-shaped support arms are arranged on the lens for focusing in the lens barrel, the petal-shaped support arms are fixed in cooperation with a voice coil motor, after assembly, the third lens can move along the optical axis direction under the driving of the voice coil motor, and the purpose of optical focusing is achieved; meanwhile, when the lens, the lens barrel and other components are arranged in cooperation and meet certain conditions, the assembly stability of the lens can be remarkably improved.

Description

Technical Field

[0001] This application relates to the field of lens technology, and in particular to an internal focusing imaging lens. Background Technology

[0002] As imaging products develop towards specialization, integration, and convenience, the imaging lenses required to match them are becoming increasingly professional and mature. For example, current mobile phone camera focusing technology has achieved "internal focusing" technology with the help of voice coil motor (VCM) technology and multi-group imaging lenses: that is, during the focusing process, the total length of the lens group remains unchanged, and multiple lens groups complete the focusing with the cooperation of the voice coil motor (usually the front and rear lens groups of the three-group lens group remain stationary, while the middle lens group moves back and forth).

[0003] Traditional mobile phone focusing relies on a small aperture and the large depth of field of a wide-angle lens to achieve a basically clear image. This type of simple camera utilizing hyperfocal distance has a very limited application range, and the image quality is relatively poor. As we know from optical principles, light is refracted after passing through an imaging lens; the point where these light rays intersect is called the focal point. The plane that forms the image of all points at the point of sharpness is usually called the focal plane. The farther away an object is from the focal plane, the blurrier the image becomes. Therefore, essentially, traditional mobile phone focusing is a data calculation method integrated into the phone's ISP (Image Signal Processor). It cannot adjust the image sensor, has obvious limitations, and is a compromise made for miniaturized imaging systems and cost.

[0004] Therefore, to further improve the imaging quality of mobile phones, various terminals are gradually adopting technologies such as "active focusing," "internal focusing," and "variable focal length lenses" in their flagship products. The principle behind these technologies is to use optical elements to generate spatial displacement or angular deflection, enabling the entire optical system to reach its theoretically optimal imaging state and changing the optical focal length to ensure the focal plane falls on the image plane (image sensor). As physical focusing continues to evolve, ensuring imaging stability and balancing costs have become crucial factors for all manufacturers. Summary of the Invention

[0005] This application aims to provide an internal focusing imaging lens to address the above-mentioned problems. When the lens elements, lens barrel, and other components of the lens are configured in a way that meets certain conditions, the assembly stability of the lens can be significantly improved.

[0006] This application provides an internal focusing imaging lens, the imaging lens comprising: a lens barrel, a lens group disposed within the lens barrel, and at least one light-shielding element; the lens group is coaxially disposed with the lens barrel; the lens group includes at least a lens with a petal-shaped support arm on its outer side; the petal-shaped support arm is disposed in a hollowed-out portion of the lens barrel.

[0007] According to one embodiment of this application, the internal focusing imaging lens further includes a first lens, which is made of plastic material; the first lens has a transmittance T1 in the 420nm-750nm band, satisfying: T1≥90%.

[0008] According to one embodiment of this application, the internal focusing imaging lens includes a first lens, which is composed of an optically effective portion and a non-optically effective portion connecting the optically effective portion; the lens half-aperture R, the radius a of the optically effective portion, and the width b of the non-optically effective portion of the first lens satisfy: R = a + b.

[0009] According to one embodiment of this application, the lens with a petal-shaped support arm on the outside is made of plastic material; the transmittance T3 of the lens with a petal-shaped support arm on the outside in the wavelength band 420nm-750nm satisfies: T3≥90%.

[0010] According to one embodiment of this application, the lens with a petal-shaped support arm on the outer side is composed of an optically effective part and a non-optically effective part connected to the optically effective part; the non-optically effective part is provided with the petal-shaped support arm, and the length e, width f and angle g of the petal-shaped support arm satisfy: e≥0.05mm, f≥0.05mm, g≥5°.

[0011] According to one embodiment of this application, the internal focusing imaging lens includes a first lens, and the lens with a petal-shaped support arm on the outside has a lens half-aperture r that is greater than the lens half-aperture R of the first lens; the lens half-aperture r of the lens with the petal-shaped support arm on the outside and the lens half-aperture R of the first lens satisfy: rR≥0.05mm.

[0012] According to one embodiment of this application, the imaging lens further includes a small lens group, the small lens group including at least the lens with a petal-shaped support arm on the outer side; when the number of lenses N in the small lens group is greater than or equal to 2, the annular protrusion on the image side of the lens with the petal-shaped support arm on the outer side engages with the fourth protrusion on the inner side of the object side of the adjacent lens on the image side of the lens with the petal-shaped support arm on the outer side.

[0013] According to one embodiment of this application, the annular boss is located outside the effective optical diameter and inside the outer aperture of the lens image side with the petal-shaped support arm on the outer side. The height h of the annular boss and the ring width j of the annular boss satisfy: 0.08mm≤h≤0.2mm, j≥0.08mm; the height k of the fourth boss and the height h of the annular boss satisfy: k≤h.

[0014] According to one embodiment of this application, the protruding annular surface of the lens other than the non-optically effective portion, which has a petal-shaped support arm on the outer side, is in contact with the first bearing surface of the lens barrel, and the axial thickness w at the first bearing surface of the lens barrel satisfies: w≥0.25mm.

[0015] According to one embodiment of this application, the angle m at the hollowed-out part of the lens barrel satisfies: m≥g, and the inner radius p at the rear end of the lens barrel and the half-aperture r of the lens with the petal-shaped support arm on the outer side satisfy: p≥r.

[0016] The beneficial effects of this application are as follows:

[0017] The technical solution of the internal focusing imaging lens disclosed in this application provides a petal-shaped support arm for the lens used for focusing in the lens barrel. By fixing the petal-shaped support arm in conjunction with a voice coil motor, the lens with the petal-shaped support arm on the outside can move along the optical axis under the drive of the voice coil motor after assembly, thereby achieving the purpose of optical focusing. At the same time, when the lens, lens barrel and other components of the lens are configured to meet certain conditions, the assembly stability of the lens can be significantly improved. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1 This is a schematic diagram of the internal focusing imaging lens structure according to an embodiment of this application;

[0020] Figure 2 This is a cross-sectional view of the front end of the internal focusing imaging lens in an embodiment of this application.

[0021] Figure 3 This is a sectional view of the front side of the internal focusing imaging lens in an embodiment of this application.

[0022] Figure 4 This is a schematic diagram of the hollow structure of the lens barrel according to an embodiment of this application;

[0023] Figure 5 This is a schematic diagram of the installation of a lens with a petal-shaped support arm on the outside and a lens barrel according to an embodiment of this application;

[0024] Figure 6 This is a schematic diagram of the structure of the first lens in an embodiment of this application;

[0025] Figure 7 This is a schematic diagram of a lens with a petal-shaped support arm on the outside, according to an embodiment of this application.

[0026] Figure 8 This is a schematic diagram of the installation of the small lens assembly according to an embodiment of this application;

[0027] Figure 9 This is a schematic diagram of the installation of a lens with a petal-shaped support arm on the outer side and an adjacent lens in an embodiment of this application.

[0028] Figure 10 This is a schematic diagram of the installation of the internal focusing imaging lens according to an embodiment of this application;

[0029] Figure 11 This is a schematic diagram of a small lens group consisting of only one lens according to an embodiment of this application.

[0030] Figure 12 This is a schematic diagram of the structure of a small lens group with two lenses according to an embodiment of this application;

[0031] Figure 13 This is a schematic diagram of the structure of a small lens group with three lenses according to an embodiment of this application.

[0032] Figure 14 This is a schematic diagram of the rear end of the small lens group without the lens in an embodiment of this application;

[0033] Figure 15 This is a schematic diagram showing a roughened surface on the first lens of an embodiment of this application, with ink applied to the roughened surface;

[0034] Figure 16 This is a schematic diagram of a lens with a petal-shaped support arm on the outside of an embodiment of this application, with a rough surface made and ink applied to the rough surface. Detailed Implementation

[0035] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of this application.

[0036] It should be noted that in this specification, the terms "first," "second," "third," etc., are used only to distinguish one feature from another and do not imply any limitation on the features. Therefore, without departing from the teachings of this application, the first lens discussed below may also be referred to as the second lens or the third lens.

[0037] It should also be understood that the terms "comprising," "including," "having," "containing," and / or "comprising," when used in this specification, indicate the presence of the stated features, elements, and / or components, but do not exclude the presence or addition of one or more other features, elements, components, and / or combinations thereof. Furthermore, when expressions such as "at least one of..." appear after a list of listed features, they modify the entire list of features, not individual elements in the list. Additionally, when describing embodiments of this application, the word "may" is used to mean "one or more embodiments of this application." And the term "exemplary" is intended to refer to an example or illustration.

[0038] In the accompanying drawings, the thickness, size, and shape of the lenses have been slightly exaggerated for ease of illustration. Specifically, the shapes of the spherical or aspherical surfaces shown in the drawings are illustrated by way of example. That is, the shapes of the spherical or aspherical surfaces are not limited to those shown in the drawings. The drawings are for illustrative purposes only and are not strictly to scale.

[0039] In the description of this application, the paraxial region refers to the region near the optical axis. If the lens surface is convex and the location of the convexity is not defined, it means that the lens surface is convex at least in the paraxial region. If the lens surface is concave and the location of the concaveness is not defined, it means that the lens surface is concave at least in the paraxial region. The surface of each lens closest to the subject is called the object-side surface of the lens, and the surface of each lens closest to the imaging plane is called the image-side surface of the lens.

[0040] Unless otherwise specified, all terms used herein (including technical and scientific terms) shall have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains. It should also be understood that terms (e.g., those defined in common dictionaries) shall be interpreted as having the meaning consistent with their meaning in the context of the relevant art and shall not be interpreted in an idealized or overly formalized manner unless expressly so specified herein.

[0041] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. The features, principles, and other aspects of this application will now be described in detail with reference to the accompanying drawings and embodiments.

[0042] Exemplary Implementation

[0043] refer to Figure 1 , Figure 2 , Figure 3 , Figure 4 as well as Figure 5As shown in the exemplary embodiment of this application, the internal focusing imaging lens includes: a lens barrel 1, a lens group 2 disposed within the lens barrel 1, and a light-shielding element 3; wherein, the lens group 2 is coaxially arranged with the lens barrel 1. By coaxially assembling the lens barrel 1 and the lens group 2, the same standard is formed in the manufacturing process, improving production efficiency and the portability of assembly. In the embodiment of this application, the lens group 2 includes a first lens 21, a second lens 22, a third lens 23, a fourth lens 24, a fifth lens 25, a sixth lens 26, and a seventh lens 27. A light-shielding element 31 is disposed between the first lens 21 and the second lens 22, a light-shielding element 32 is disposed between the third lens 23 and the fourth lens 24, and a light-shielding element 33 is disposed between the fourth lens 24 and the fifth lens 25; wherein, a petal-shaped support arm 231 is disposed on the outer side of the third lens 23, and the petal-shaped support arm 231 is disposed at the hollow 11 of the lens barrel 1. During the assembly of the lens in this application, the third lens 23 is installed into the lens barrel 1 at a specific angle. Here, the petal-shaped support arm 231 on the outside of the third lens 23 is placed at the hollow 11 of the lens barrel 1. During the lens assembly, image recognition is used to install it at a specific angle to avoid interference. The other lenses, light-shielding elements, etc. are installed in sequence.

[0044] In an exemplary embodiment of this application, preferably, the first lens 21 is made of plastic material, and the transmittance T1 of the first lens 21 in the band 420nm-750nm satisfies: T1≥90%. In the embodiments of this application, such high transmittance can ensure the MTF performance of the lens.

[0045] refer to Figure 6 As shown, in an exemplary embodiment of this application, the first lens 21 is composed of an optically effective portion and a non-optically effective portion connecting the optically effective portion; the lens half-aperture R, the radius a of the optically effective portion, and the width b of the non-optically effective portion of the first lens 21 satisfy: R = a + b.

[0046] In an exemplary embodiment of this application, preferably, the third lens 23 is made of plastic material; the transmittance T3 of the third lens 23 in the 420nm-750nm band satisfies: T3≥90%. In the embodiments of this application, such high transmittance can ensure the MTF performance of the lens.

[0047] refer to Figure 7As shown, in an exemplary embodiment of this application, the third lens 23 consists of an optically effective part and a non-optically effective part connecting the optically effective part. The half-aperture of the optically effective part is c, and the half-aperture of the non-optically effective part is d. The half-aperture of the third lens 23 is r = c + d. The non-optically effective part is provided with the petal-shaped support arm 231. The length e, width f, and angle g of the petal-shaped support arm satisfy: e ≥ 0.05 mm, f ≥ 0.05 mm, g ≥ 5°. In the embodiment of this application, the petal-shaped support arm 231 is used to cooperate with and fix the voice coil motor. After assembly, the third lens 23 can move along the optical axis direction under the drive of the voice coil motor to achieve the purpose of optical focusing.

[0048] Continue to refer to Figure 6 , Figure 7 As shown, in an exemplary embodiment of this application, the half-aperture r of the third lens 23 is greater than the half-aperture R of the first lens 21; the half-aperture r of the third lens 23 and the half-aperture R of the first lens 21 satisfy: rR≥0.05mm.

[0049] In an exemplary embodiment of this application, the internal focusing imaging lens includes a microlens group comprising at least a third lens 23, wherein the number of lenses in the microlens group N ≥ 2. (See reference...) Figure 1 , Figure 8 as well as Figure 9 As shown, the third lens 23, fourth lens 24, fifth lens 25, and their light-shielding elements 32 and 33 of the internal focusing imaging lens in this embodiment are considered as a small lens group during assembly and operation. The fourth lens 24 and fifth lens 25 fit relatively loosely with the lens barrel 1, facilitating axial movement as a whole. The axial positioning of the fourth lens 24 and fifth lens 25 mainly relies on the third lens 23, and the two lenses are engaged by a snap-fit ​​method and fixed with glue. The third lens 23 is fitted with the fourth lens 24 through a cylindrical or conical surface at its outer aperture. To achieve a better fit, the image-side surface of the third lens 23 is provided with an annular boss 232 outside the optical effective diameter and inside the outer aperture. The height h of the annular boss 232 satisfies: 0.08mm≤h≤0.2mm; the width j of the annular boss 232 satisfies: j≥0.08mm. Correspondingly, a fourth boss 241 is also provided on the inner side of the object-side surface of the fourth lens 24. The height k of the fourth boss 241 satisfies: k≤h.

[0050] In an exemplary embodiment of this application, the protruding annular surface 233 of the third lens 23, other than the optically effective portion, is fitted with the first bearing surface of the lens barrel 1. In this example, in order to ensure a better assembly effect, the axial thickness w at the first bearing surface of the lens barrel 1 satisfies: w≥0.25mm.

[0051] In the exemplary embodiments of this application, reference continues to be made to... Figure 2 , Figure 7 as well as Figure 10 As shown, the angle m at the cutout 11 of the lens barrel 1 satisfies: m≥g, and the inner radius p of the rear end of the lens barrel 1 and the half-aperture r of the third lens 23 satisfy: p≥r.

[0052] The following describes a specific embodiment of the optical imaging lens applicable to the above embodiments with reference to the accompanying drawings. Specific Implementation Example 1

[0054] refer to Figure 11 As shown, the internal focusing imaging lens includes: a lens barrel 1, a lens group 2 disposed within the lens barrel 1, and a light-shielding element 3. The lens group 2 includes: a first lens 21, a second lens 22, a third lens 23, a fourth lens 24, and a fifth lens 25. The light-shielding element 3 is disposed between the first lens 21 and the second lens 22. A petal-shaped support arm 231 is disposed on the outer side of the third lens 23 at a cutout 11 in the lens barrel 1. During lens assembly, the third lens 23 is installed into the lens barrel 1 at a specific angle. Here, the petal-shaped support arm 231 on the outer side of the third lens 23 is placed at the cutout 11 in the lens barrel 1. Image recognition is used during lens assembly to install it at a specific angle to avoid interference. The remaining lenses and light-shielding elements are then installed sequentially.

[0055] Both the first lens 21 and the third lens 23 are made of plastic. The transmittance T of the first lens 21 and the third lens 23 in the band 420nm-750nm both satisfy: T≥90%.

[0056] The length e, width f, and angle g of the petal-shaped support arm 231 satisfy: e≥0.05mm, f≥0.05mm, g≥5°.

[0057] The half-aperture r of the third lens 23 and the half-aperture R of the first lens 21 satisfy: rR≥0.05mm.

[0058] In the embodiments of this application, the small lens group includes only one lens, the third lens 23. The third lens 23 is attached to the first bearing surface of the lens barrel 1 through the protruding annular surface 233 other than the optically effective part, wherein the axial thickness W of the first bearing surface is ≥0.25mm.

[0059] The angle m at the cutout 11 of the lens barrel 1 satisfies: m≥g≥5°. The inner radius p at the rear end of the lens barrel 1 and the half-aperture r of the third lens 23 satisfy: p≥r. Specific Implementation Example 2

[0061] refer to Figure 12As shown, the internal focusing imaging lens includes: a lens barrel 1, a lens group 2 disposed within the lens barrel 1, and a light-shielding element 3. The lens group 2 includes: a first lens 21, a second lens 22, a third lens 23, a fourth lens 24, a fifth lens 25, and a sixth lens 26. The light-shielding element 31 is disposed between the first lens 21 and the second lens 22, and the light-shielding element 32 is disposed between the third lens 23 and the fourth lens 24. A petal-shaped support arm 231 is disposed on the outer side of the third lens 23 at a cutout 11 in the lens barrel 1. During lens assembly, the third lens 23 is installed into the lens barrel 1 at a specific angle. Here, the petal-shaped support arm 231 on the outer side of the third lens 23 is placed at the cutout 11 in the lens barrel 1. Image recognition is used during lens assembly to install it at a specific angle to avoid interference. The remaining lenses and light-shielding elements are then installed sequentially.

[0062] Both the first lens 21 and the third lens 23 are made of plastic. The transmittance T of the first lens 21 and the third lens 23 in the band 420nm-750nm both satisfy: T≥90%.

[0063] The length e, width f, and angle g of the petal-shaped support arm 231 satisfy: e≥0.05mm, f≥0.05mm, g≥5°.

[0064] The half-aperture r of the third lens 23 and the half-aperture R of the first lens 21 satisfy: rR≥0.05mm.

[0065] In the embodiments of this application, the small lens group consists of a third lens 23 and a fourth lens 24. The third lens 23 is fitted with the fourth lens 24 through a cylindrical or conical surface at its outer diameter and fixed with glue. In order to achieve a better fit, an annular boss 232 is provided on the image side of the third lens 23 outside the optical effective diameter and inside the outer diameter. The height h of the annular boss 232 satisfies: 0.08mm≤h≤0.2mm; the width j of the annular boss 232 satisfies: j≥0.08mm. Correspondingly, a fourth boss 241 is also provided on the inner side of the object side of the fourth lens 24. The height k of the fourth boss 241 satisfies: k≤h.

[0066] In the embodiments of this application, the third lens 23 is attached to the first bearing surface of the lens barrel 1 through a protruding annular surface 233 other than the optically effective part, wherein the axial thickness W of the first bearing surface is ≥0.25mm.

[0067] The angle m at the cutout 11 of the lens barrel 1 satisfies: m≥g≥5°. The inner radius p at the rear end of the lens barrel 1 and the half-aperture r of the third lens 23 satisfy: p≥r. Specific Implementation Example 3

[0069] refer to Figure 13 As shown, the internal focusing imaging lens includes: a lens barrel 1, a lens group 2 disposed within the lens barrel 1, and a light-shielding element 3. The lens group 2 includes: a first lens 21, a second lens 22, a third lens 23, a fourth lens 24, a fifth lens 25, a sixth lens 26, and a seventh lens 27. A light-shielding element 31 is disposed between the first lens 21 and the second lens 22; a light-shielding element 32 is disposed between the third lens 23 and the fourth lens 24; and a light-shielding element 33 is disposed between the fourth lens 24 and the fifth lens 25. A petal-shaped support arm 231 is disposed on the outer side of the third lens 23 at a cutout 11 in the lens barrel 1. During lens assembly, the third lens 23 is installed into the lens barrel 1 at a specific angle. Here, the petal-shaped support arm 231 on the outer side of the third lens 23 is placed at the cutout 11 in the lens barrel 1. Image recognition is used during lens assembly to install it at a specific angle to avoid interference. The remaining lenses and light-shielding elements are then installed sequentially.

[0070] Both the first lens 21 and the third lens 23 are made of plastic. The transmittance T of the first lens 21 and the third lens 23 in the band 420nm-750nm both satisfy: T≥90%.

[0071] The length e, width f, and angle g of the petal-shaped support arm 231 satisfy: e≥0.05mm, f≥0.05mm, g≥5°.

[0072] The half-aperture r of the third lens 23 and the half-aperture R of the first lens 21 satisfy: rR≥0.05mm.

[0073] In the embodiments of this application, the third lens 23, the fourth lens 24, the fifth lens 25, and the light-shielding elements 32 and 33 therein are considered as a small lens group during assembly and operation. The fourth lens 24 and the fifth lens 25 fit relatively loosely with the lens barrel 1, facilitating axial movement as a whole. The axial positioning of the fourth lens 24 and the fifth lens 25 mainly relies on the third lens 23, and the two lenses are fitted together by a snap-fit ​​method and fixed with glue. The third lens 23 engages with the fourth lens 24 through a cylindrical or conical surface at its outer aperture. To achieve a better fit, an annular boss 232 is provided on the image-side surface of the third lens 23, outside the effective optical diameter but inside the outer aperture. The height h of the annular boss 232 satisfies: 0.08mm ≤ h ≤ 0.2mm; the width j of the annular boss 232 satisfies: j ≥ 0.08mm. Correspondingly, a fourth boss 241 is also provided on the inner side of the object-side surface of the fourth lens 24, and the height k of the fourth boss 241 satisfies: k ≤ h.

[0074] In another embodiment of this application, a petal-shaped support arm 251 is provided on the fifth lens 25. The fifth lens 25 is installed in the lens barrel 1 at a specific angle. Here, the petal-shaped support arm 251 on the outside of the fifth lens 25 is placed at the hollow 12 of the lens barrel 1. The small lens group is held in the middle position by the snap-fit ​​of the third lens 23 and the fifth lens 25, without the need for glue to fix it.

[0075] In the embodiments of this application, the third lens 23 is attached to the first bearing surface of the lens barrel 1 through a protruding annular surface 233 other than the optically effective part, wherein the axial thickness W of the first bearing surface is ≥0.25mm.

[0076] The angle m at the cutout 11 of the lens barrel 1 satisfies: m≥g≥5°. The inner radius p at the rear end of the lens barrel 1 and the half-aperture r of the third lens 23 satisfy: p≥r. Specific Implementation Example 4

[0078] refer to Figure 14 As shown, the internal focusing imaging lens includes: a lens barrel 1, a lens group 2 disposed within the lens barrel 1, and a light-shielding element 3. The lens group 2 includes: a first lens 21, a third lens 23, a fourth lens 24, a fifth lens 25, and a sixth lens 26. The light-shielding element 31 is disposed between the first lens 23 and the second lens 24, and the light-shielding element 32 is disposed between the third lens 25 and the fourth lens 26. A petal-shaped support arm 231 is disposed on the outer side of the third lens 23 at a cutout 11 in the lens barrel 1. During lens assembly, the third lens 23 is installed into the lens barrel 1 at a specific angle. Here, the petal-shaped support arm 231 on the outer side of the third lens 23 is placed at the cutout 11 in the lens barrel 1. Image recognition is used during lens assembly to install it at a specific angle to avoid interference. The remaining lenses and light-shielding elements are then installed sequentially.

[0079] Both the first lens 21 and the third lens 23 are made of plastic. The transmittance T of the first lens 21 and the third lens 23 in the band 420nm-750nm both satisfy: T≥90%.

[0080] The length e, width f, and angle g of the petal-shaped support arm 231 satisfy: e≥0.05mm, f≥0.05mm, g≥5°.

[0081] The half-aperture r of the third lens 23 and the half-aperture R of the first lens 21 satisfy: rR≥0.05mm.

[0082] In the embodiments of this application, the rear end of the small lens group does not contain a lens. The third lens 23, fourth lens 24, fifth lens 25, and sixth lens 26 of the internal focusing imaging lens, along with their respective light-shielding elements 31, are considered as a small lens group during assembly and operation. The fourth lens 24, fifth lens 25, and sixth lens 26 fit relatively loosely with the lens barrel 1, facilitating axial movement as a whole. The axial positioning of the fourth lens 24, fifth lens 25, and sixth lens 26 primarily relies on the third lens 23. The three lenses are fitted together using a snap-fit ​​method and fixed with adhesive. The third lens 23 is fitted with the fourth lens 24 through a cylindrical or conical surface at its outer aperture. To achieve a better fit, the image-side surface of the third lens 23 is provided with an annular boss 232 outside the optical effective diameter and inside the outer aperture. The height h of the annular boss 232 satisfies: 0.08mm≤h≤0.2mm; the width j of the annular boss 232 satisfies: j≥0.08mm. Correspondingly, a fourth boss 241 is also provided on the inner side of the object-side surface of the fourth lens 24. The height k of the fourth boss 241 satisfies: k≤h.

[0083] In another embodiment of this application, a petal-shaped support arm 261 is provided on the sixth lens 26. The sixth lens 26 is installed in the lens barrel 1 at a specific angle. Here, the petal-shaped support arm 261 on the outside of the sixth lens 26 is placed at the hollow 12 of the lens barrel 1. The small lens group is fastened by the third lens 23 and the sixth lens 25, and the fourth lens 24 and the fifth lens 25 are held in the middle position without the need for glue.

[0084] In the embodiments of this application, the third lens 23 is attached to the first bearing surface of the lens barrel 1 through a protruding annular surface 233 other than the optically effective part, wherein the axial thickness W of the first bearing surface is ≥0.25mm.

[0085] The angle m at the cutout 11 of the lens barrel 1 satisfies: m≥g≥5°. The inner radius p at the rear end of the lens barrel 1 and the half-aperture r of the third lens 23 satisfy: p≥r. Specific Implementation Example 5

[0087] refer to Figure 1 and Figure 15As shown, the internal focusing imaging lens includes: a lens barrel 1, a lens group 2 disposed within the lens barrel 1, and a light-shielding element 3. The lens group 2 includes: a first lens 21, a second lens 22, a third lens 23, a fourth lens 24, a fifth lens 25, a sixth lens 26, and a seventh lens 27. A light-shielding element 31 is disposed between the first lens 21 and the second lens 22; a light-shielding element 32 is disposed between the third lens 23 and the fourth lens 24; and a light-shielding element 33 is disposed between the fourth lens 24 and the fifth lens 25. A petal-shaped support arm 231 is disposed on the outer side of the third lens 23 at a cutout 11 in the lens barrel 1. During lens assembly, the third lens 23 is installed into the lens barrel 1 at a specific angle. Here, the petal-shaped support arm 231 on the outer side of the third lens 23 is placed at the cutout 11 in the lens barrel 1. Image recognition is used during lens assembly to install it at a specific angle to avoid interference. The remaining lenses and light-shielding elements are then installed sequentially.

[0088] Both the first lens 21 and the third lens 23 are made of plastic. The transmittance T of the first lens 21 and the third lens 23 in the band 420nm-750nm both satisfy: T≥90%.

[0089] The length e, width f, and angle g of the petal-shaped support arm 231 satisfy: e≥0.05mm, f≥0.05mm, g≥5°.

[0090] The half-aperture r of the third lens 23 and the half-aperture R of the first lens 21 satisfy: rR≥0.05mm.

[0091] In the embodiments of this application, the third lens 23, the fourth lens 24, the fifth lens 25, and the light-shielding elements 32 and 33 therein are considered as a small lens group during assembly and operation. The fourth lens 24 and the fifth lens 25 fit relatively loosely with the lens barrel 1, facilitating axial movement as a whole. The axial positioning of the fourth lens 24 and the fifth lens 25 mainly relies on the third lens 23, and the two lenses are fitted together by a snap-fit ​​method and fixed with glue. The third lens 23 engages with the fourth lens 24 through a cylindrical or conical surface at its outer aperture. To achieve a better fit, an annular boss 232 is provided on the image-side surface of the third lens 23, outside the effective optical diameter but inside the outer aperture. The height h of the annular boss 232 satisfies: 0.08mm ≤ h ≤ 0.2mm; the width j of the annular boss 232 satisfies: j ≥ 0.08mm. Correspondingly, a fourth boss 241 is also provided on the inner side of the object-side surface of the fourth lens 24, and the height k of the fourth boss 241 satisfies: k ≤ h.

[0092] In another embodiment of this application, a petal-shaped support arm 251 is provided on the fifth lens 25. The fifth lens 25 is installed in the lens barrel 1 at a specific angle. Here, the petal-shaped support arm 251 on the outside of the fifth lens 25 is placed at the hollow 12 of the lens barrel 1. The small lens group is held in the middle position by the snap-fit ​​of the third lens 23 and the fifth lens 25, without the need for glue to fix it.

[0093] In the embodiments of this application, the third lens 23 is attached to the first bearing surface of the lens barrel 1 through a protruding annular surface 233 other than the optically effective part, wherein the axial thickness W of the first bearing surface is ≥0.25mm.

[0094] The angle m at the cutout 11 of the lens barrel 1 satisfies: m≥g≥5°. The inner radius p at the rear end of the lens barrel 1 and the half-aperture r of the third lens 23 satisfy: p≥r.

[0095] In this embodiment, the position of the first lens 21 that is in contact with the lens barrel 1 is roughened, and ink is applied to the roughened surface. In this embodiment, by controlling the reflectivity of the ink used for applying the ink to R < 1%, the reflected light from the sidewalls and cut edges can be absorbed more effectively, thereby improving the appearance and reducing stray light. Specific Implementation Example 6

[0097] refer to Figure 1 and Figure 16 As shown, the internal focusing imaging lens includes: a lens barrel 1, a lens group 2 disposed within the lens barrel 1, and a light-shielding element 3. The lens group 2 includes: a first lens 21, a second lens 22, a third lens 23, a fourth lens 24, a fifth lens 25, a sixth lens 26, and a seventh lens 27. A light-shielding element 31 is disposed between the first lens 21 and the second lens 22; a light-shielding element 32 is disposed between the third lens 23 and the fourth lens 24; and a light-shielding element 33 is disposed between the fourth lens 24 and the fifth lens 25. A petal-shaped support arm 231 is disposed on the outer side of the third lens 23 at a cutout 11 in the lens barrel 1. During lens assembly, the third lens 23 is installed into the lens barrel 1 at a specific angle. Here, the petal-shaped support arm 231 on the outer side of the third lens 23 is placed at the cutout 11 in the lens barrel 1. Image recognition is used during lens assembly to install it at a specific angle to avoid interference. The remaining lenses and light-shielding elements are then installed sequentially.

[0098] Both the first lens 21 and the third lens 23 are made of plastic. The transmittance T of the first lens 21 and the third lens 23 in the band 420nm-750nm both satisfy: T≥90%.

[0099] The length e, width f, and angle g of the petal-shaped support arm 231 satisfy: e≥0.05mm, f≥0.05mm, g≥5°.

[0100] The half-aperture r of the third lens 23 and the half-aperture R of the first lens 21 satisfy: rR≥0.05mm.

[0101] In the embodiments of this application, the third lens 23, the fourth lens 24, the fifth lens 25, and the light-shielding elements 32 and 33 therein are considered as a small lens group during assembly and operation. The fourth lens 24 and the fifth lens 25 fit relatively loosely with the lens barrel 1, facilitating axial movement as a whole. The axial positioning of the fourth lens 24 and the fifth lens 25 mainly relies on the third lens 23, and the two lenses are fitted together by a snap-fit ​​method and fixed with glue. The third lens 23 engages with the fourth lens 24 through a cylindrical or conical surface at its outer aperture. To achieve a better fit, an annular boss 232 is provided on the image-side surface of the third lens 23, outside the effective optical diameter but inside the outer aperture. The height h of the annular boss 232 satisfies: 0.08mm ≤ h ≤ 0.2mm; the width j of the annular boss 232 satisfies: j ≥ 0.08mm. Correspondingly, a fourth boss 241 is also provided on the inner side of the object-side surface of the fourth lens 24, and the height k of the fourth boss 241 satisfies: k ≤ h.

[0102] In another embodiment of this application, a petal-shaped support arm 251 is provided on the fifth lens 25. The fifth lens 25 is installed in the lens barrel 1 at a specific angle. Here, the petal-shaped support arm 251 on the outside of the fifth lens 25 is placed at the hollow 12 of the lens barrel 1. The small lens group is held in the middle position by the snap-fit ​​of the third lens 23 and the fifth lens 25, without the need for glue to fix it.

[0103] In the embodiments of this application, the third lens 23 is attached to the first bearing surface of the lens barrel 1 through a protruding annular surface 233 other than the optically effective part, wherein the axial thickness W of the first bearing surface is ≥0.25mm.

[0104] The angle m at the cutout 11 of the lens barrel 1 satisfies: m≥g≥5°. The inner radius p at the rear end of the lens barrel 1 and the half-aperture r of the third lens 23 satisfy: p≥r.

[0105] In this embodiment, the position of the third lens 23 that is in contact with the lens barrel 1 is roughened, and ink is applied to the roughened surface. In this embodiment, by controlling the reflectivity of the ink used for applying the ink to R < 1%, the reflected light from the sidewalls and cut edges can be absorbed more effectively, thereby improving the appearance and reducing stray light.

[0106] The above description is merely a preferred embodiment of this application and is not intended to limit this application. Any modifications, improvements, or equivalent substitutions made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. An internal focusing imaging lens, characterized in that, The imaging lens includes: a lens barrel, a lens group disposed within the lens barrel, and at least one light-shielding element; The lens group is coaxially arranged with the lens barrel; The lens group includes at least The lens has a petal-shaped support arm on the outside; The petal-shaped support arm is placed in the hollow part of the lens barrel; The imaging lens also includes a small lens group, which includes at least the lens with a petal-shaped support arm on the outer side; When the number of lenses N in the small lens group is greater than or equal to 2, the annular protrusion on the image side of the lens with the petal-shaped support arm on the outside engages with the fourth protrusion on the inner side of the object side of the adjacent lens with the petal-shaped support arm on the image side of the lens. A petal-shaped support arm is provided for the lens used for focusing in the lens barrel, and the petal-shaped support arm is fixed in conjunction with the voice coil motor.

2. The internal focusing imaging lens according to claim 1, characterized in that, The internal focusing imaging lens includes a first lens, which is made of plastic material; The first lens has a transmittance T1 in the 420nm-750nm band, which satisfies the condition: T1≥90%.

3. The internal focusing imaging lens according to claim 1, characterized in that, The internal focusing imaging lens includes a first lens, which consists of an optically effective part and a non-optically effective part connected to the optically effective part; The first lens has a lens half-aperture R, an effective optical radius a, and a non-effective optical width b, which satisfy the following condition: R = a + b.

4. The internal focusing imaging lens according to claim 1, characterized in that, The lens with a petal-shaped support arm on the outside is made of plastic. The lens with a petal-shaped support arm on the outside has a transmittance T3 in the 420nm-750nm band, which satisfies: T3≥90%.

5. The internal focusing imaging lens according to claim 1, characterized in that, The lens with a petal-shaped support arm on the outside consists of an optically effective part and a non-optically effective part connecting the optically effective part; The non-optically effective part is provided with the petal-shaped support arm, and the length e, width f, and angle g of the petal-shaped support arm satisfy: e≥0.05mm, f≥0.05mm, g≥5°.

6. The internal focusing imaging lens according to claim 1, characterized in that, The internal focusing imaging lens includes a first lens, and the lens with a petal-shaped support arm on the outside has a lens half-aperture r that is larger than the lens half-aperture R of the first lens. The lens half-aperture r of the lens with petal-shaped support arm on the outside and the lens half-aperture R of the first lens satisfy: rR≥0.05mm.

7. The internal focusing imaging lens according to claim 1, characterized in that, The annular boss is located outside the effective optical diameter and inside the outer diameter of the lens image side with the petal-shaped support arm on the outer side. The height h of the annular boss and the ring width j of the annular boss satisfy: 0.08mm≤h≤0.2mm, j≥0.08mm. The height k of the fourth boss and the height h of the annular boss satisfy: k ≤ h.

8. The internal focusing imaging lens according to claim 1, characterized in that, The protruding annular surface of the lens, excluding the non-optically effective portion, which has a petal-shaped support arm on the outer side, is in contact with the first bearing surface of the lens barrel. The axial thickness w at the first bearing surface of the lens barrel satisfies: w≥0.25mm.

9. The internal focusing imaging lens according to claim 5, characterized in that, The angle m at the hollowed-out part of the lens barrel satisfies: m≥g, and the inner radius p at the rear end of the lens barrel and the half-aperture r of the lens with the petal-shaped support arm on the outside satisfy: p≥r.

Images