Optical lens, manufacturing method thereof, and imaging module

Abstract

The present application discloses an optical lens, a manufacturing method of the optical lens, and an imaging module. The optical lens includes a first lens and a lens assembly connected to the optical lens. The first lens includes a first optical region and a first structural region surrounding the first optical region. The first structural region includes a height measurement region where an anti-reflection film is not coated. And the lens assembly includes a lens barrel and at least one second lens disposed in the lens barrel. The at least one second lens includes a second optical region and a second structural region surrounding the second optical region. The first structural region is connected to an end face of the lens barrel close to the first lens or the second structural region of the second lens closest to the first lens.

Description

Technical Field

[0001] This application relates to the field of optical elements, and more particularly, to an optical lens, a manufacturing method of the optical lens, and an imaging module. Background Art

[0002] A split lens generally includes a plurality of lens components. Each component includes at least one lens. During the manufacturing process of the split lens, the relative positions between the lens components need to be repeatedly corrected through an active calibration process. In this process, measuring the attitude or position of the lens components is an important step. Summary of the Invention

[0003] One aspect of this application provides an optical lens, which includes: a first lens, the first lens includes a first optical region and a first structural region surrounding the first optical region, and the first structural region includes a height measurement region where an anti-reflection film is not plated; and a lens component, the lens component includes a lens barrel and at least one second lens disposed in the lens barrel, the at least one second lens includes a second optical region and a second structural region surrounding the second optical region, and the first structural region is connected to an end face of the lens barrel close to the first lens or the second structural region of the second lens closest to the first lens.

[0004] In one embodiment, the height measurement region is an annular planar region.

[0005] In one embodiment, the length of the annular planar region in the axial direction of the first lens is 0.2 mm or more.

[0006] In one embodiment, the height measurement region includes at least three mutually spaced planar regions.

[0007] In one embodiment, the length of the planar region in the axial direction of the first lens is 0.2 mm or more, and the length of the planar region in the circumferential direction of the first lens is 0.5 mm or more.

[0008] In one embodiment, the height measurement region is plated with an anti-reflection film.

[0009] In one embodiment, the height measurement region is located on a side of the first lens facing away from the lens component.

[0010] In one embodiment, the height measurement region is located on a side of the first lens close to the lens component.

[0011] In one embodiment, the roughness of the height measurement region is less than the roughness of other regions of the first structural region.

[0012] In one embodiment, the height measurement area is located at the outer edge of the first lens.

[0013] Another aspect of the present application provides a method for manufacturing an optical lens. The manufacturing method includes: obtaining a first posture of the first lens based on a ranging light beam reflected by a height measurement area of the first lens without an anti-reflection film; adjusting an angle of the first lens according to the first posture so that a relative inclination angle between the first lens and the lens assembly is within a predetermined threshold; pre-positioning the first lens, the lens assembly, and a photosensitive component so that an image formed by the first lens and the lens assembly can be obtained on the photosensitive component; actively calibrating a relative position between the first lens and the lens assembly based on the formed image; and fixing the first lens to the lens assembly based on the relative position between the first lens and the lens assembly after the active calibration.

[0014] In one embodiment, a length of the annular planar area in an axial direction of the first lens is 0.2 mm or more.

[0015] In one embodiment, the height measurement area includes at least three planar areas spaced apart from each other.

[0016] In one embodiment, a length of the planar area in an axial direction of the first lens is 0.2 mm or more, and a length of the planar area in a circumferential direction of the first lens is 0.5 mm or more.

[0017] In one embodiment, a roughness of the height measurement area is less than a roughness of an adjacent area of the height measurement area.

[0018] In one embodiment, adjusting the angle of the first lens according to the first posture includes: obtaining a second posture of the lens assembly based on a ranging light beam reflected by the lens assembly; and adjusting the angle of the first lens according to the first posture and the second posture so that a relative inclination angle between the first lens and the lens assembly is within a predetermined threshold.

[0019] In one embodiment, the manufacturing method further includes: depositing an anti-reflection film on the height measurement area.

[0020] In one embodiment, the first lens includes a first optical area and a first structural area surrounding the first optical area. The first structural area includes the height measurement area. The manufacturing method further includes: depositing the anti-reflection film only on the first optical area and a portion of the first structural area except the height measurement area by controlling an evaporation angle of an evaporation source.

[0021] In one embodiment, the first lens includes a first optical zone and a first structural zone surrounding the first optical zone, the first structural zone includes the height measurement zone, and the manufacturing method further includes: by disposing a mask between the height measurement zone and the evaporation source, so as to coat the antireflection film only on the first optical zone and the portion of the first structural zone other than the height measurement zone.

[0022] In one embodiment, the predetermined threshold may be 0.1 degree.

[0023] Another aspect of the present application provides an imaging module, which includes: the optical lens provided in the above embodiment; a lens holder, the optical lens is fixed to the lens holder, and the lens holder includes an opening aligned with the lens of the optical lens; a filter, the filter is fixed to the opening; a substrate, the lens holder is fixed to the substrate; and an image sensor, the image sensor is fixed on the substrate and is wrapped by the lens holder and the filter.

[0024] The optical lens provided by the present application includes a first lens and a lens assembly connected thereto. During the manufacturing process of the optical lens, based on the ranging beam reflected by the uncoated height measurement zone of the first structural zone on the first lens, the first attitude of the first lens is obtained. The angle of the first lens can be adjusted according to the first attitude, so that there is a small relative inclination angle between the first lens and the lens assembly, which is beneficial to pre-positioning and active calibration in subsequent lens manufacturing, thereby improving the yield and efficiency of lens production. Description of the Drawings

[0025] In combination with the drawings, through the following detailed description of non-limiting embodiments, other features, objects and advantages of the present application will become more obvious. In the drawings:

[0026] Figure 1 To show a schematic cross-sectional structure diagram of the optical lens according to an embodiment of the present application;

[0027] Figure 2 To show a schematic cross-sectional structure diagram of the optical lens according to another embodiment of the present application;

[0028] Figure 3 To show a schematic structural diagram of the first lens according to an embodiment of the present application;

[0029] Figure 4 To show a schematic plan view of the first lens according to an embodiment of the present application;

[0030] Figure 5 To show a schematic plan view of the first lens according to another embodiment of the present application;

[0031] Figure 6A partial planar enlarged schematic diagram of the first lens according to another embodiment of the present application;

[0032] Figure 7 An overall structural schematic diagram of an optical lens according to an embodiment of the present application;

[0033] Figure 8 A flowchart of a manufacturing method of an optical lens according to an embodiment of the present application;

[0034] Figure 9 A schematic diagram showing the adjustment direction of the first lens relative to the lens assembly during active calibration provided by an embodiment of the present application;

[0035] Figure 10 A schematic diagram of a coating method on the first lens provided by an embodiment of the present application;

[0036] Figure 11 A structural schematic diagram of an imaging module according to an embodiment of the present application. Detailed Description of the Embodiment

[0037] To better understand the present application, more detailed descriptions of various aspects of the present application will be made with reference to the accompanying drawings. It should be understood that these detailed descriptions are only descriptions of exemplary embodiments of the present application and do not limit the scope of the present application in any way. Throughout the specification, the same reference numerals refer to the same elements. The expression "and / or" includes any and all combinations of one or more of the associated listed items.

[0038] It should be noted that in this specification, the expressions such as first, second, and third are only used to distinguish one feature from another feature and do not represent any limitation on the features.

[0039] It should also be understood that the terms "include", "include having", "have", "contain", and / or "contain having", 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. In addition, when an expression such as "at least one of..." appears after the list of listed features, it modifies the entire list of listed features rather than individual elements in the list. In addition, when describing the embodiments of the present application, the use of "may" means "one or more embodiments of the present application". And the term "exemplary" is intended to refer to an example or illustration.

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

[0041] It should be noted that, without conflict, the embodiments in this application and the features in the embodiments may be combined with each other. The following will detail this application with reference to the drawings and in combination with the embodiments.

[0042] The features, principles, and other aspects of this application are described in detail below.

[0043] This application provides an optical lens with high imaging quality that has been precisely adjusted and calibrated in attitude between a lens and a lens assembly. Its specific structure is detailed in the following embodiments.

[0044] Figure 1 To show a schematic cross-sectional structure diagram of the optical lens according to an embodiment of this application. As Figure 1 shown, the optical lens of this application includes a first lens 100 and a lens assembly 110 connected to the first lens 100. The first lens 100 includes a first optical zone 101 and a first structural zone 102 surrounding the first optical zone 101. The first structural zone 102 includes a height measurement zone 103 that is not coated with an anti-reflection film. In this embodiment, the regions of the first optical zone 101 and the first structural zone 102 except for the height measurement zone 103 may be coated with an anti-reflection film 108 to improve the light transmittance of the first lens 100. The height measurement zone 103 is not coated with an anti-reflection film, which enables the first lens 100 to better reflect the ranging beam at the position of the height measurement zone 103, so as to help obtain a more precise tilt attitude of the first lens 100, that is, the first attitude of the first lens 100.

[0045] The lens assembly 110 includes a lens barrel 104 and at least one second lens 105 disposed in the lens barrel 104. The at least one second lens 105 includes a second optical zone 106 and a second structural zone 107 surrounding the second optical zone 106. In this embodiment, the first structural zone 102 is connected to the end face 109 of the lens barrel 104 close to the first lens 100. During the process of manufacturing the optical lens provided by this application, the angle of the first lens 100 can be adjusted according to the obtained first attitude, so that the relative inclination angle between the first lens 100 and the lens assembly is within a predetermined threshold, which is beneficial for pre-positioning and active calibration in the subsequent manufacturing process of the lens, thereby improving the yield and efficiency of lens production. The predetermined threshold may be 0.1 degree (°). Additionally, according to the requirements of precision and tolerance, the predetermined threshold can be selected as 0.03 degree or 0.01 degree.Figure 7 To show a schematic diagram of the overall structure of an optical lens according to an embodiment of the present application. As Figure 7 shown, the first lens 100 of the optical lens 1 is connected to the lens assembly 110.

[0046] Figure 2 To show a schematic diagram of the structure of an optical lens according to another embodiment of the present application. As Figure 2 shown, the optical lens of the present application includes a first lens 200 and a lens assembly 210 connected to the first lens 200. The first lens 200 includes a first optical region 201 and a first structural region 202 surrounding the first optical region 201. The first structural region 202 includes a height measurement region 203 without an anti-reflection coating. In this embodiment, the regions of the first optical region 201 and the first structural region 202 except the height measurement region 203 may be coated with an anti-reflection film 208 to improve the light transmittance of the first lens 200. The height measurement region 203 is not coated with an anti-reflection film, which enables the first lens 200 to better reflect the ranging beam at the position of the height measurement region 203 to help obtain a more accurate tilt attitude of the first lens 200, that is, the first attitude of the first lens 200.

[0047] The lens assembly 210 includes a lens barrel 204 and at least one second lens 205 disposed in the lens barrel 204. The at least one second lens 205 includes a second optical region 206 and a second structural region 207 surrounding the second optical region 206. In this embodiment, the first structural region 202 is connected to the second structural region 207 of the second lens 205 closest to the first lens 200 in the lens barrel 204. During the process of manufacturing the optical lens provided by the present application, the angle of the first lens 200 can be adjusted according to the obtained first attitude, so that the relative inclination angle between the first lens 200 and the lens assembly is within a predetermined threshold, which is beneficial for pre-positioning and active calibration in the subsequent manufacturing process of the lens, thereby improving the yield and efficiency of lens production. The predetermined threshold may be 0.1 degree (°). Additionally, according to the requirements of accuracy and tolerance, the predetermined threshold may be selected as 0.03 degree or 0.01 degree. At the same time, in this embodiment, the connection between the first structural region 202 and the second structural region 207 of the second lens 205 closest to the first lens 200 in the lens barrel 204 can reduce the influence of the end face of the lens barrel 204 close to the first lens 100 on the assembly process of the split lens.

[0048] In the present application, if the height measurement region is coated with an anti-reflection film, the light beam received by the ranging device at the same position will be reduced, resulting in inaccurate detection of the tilt attitude of the lens. Therefore, the height measurement region in the present application is not coated with an anti-reflection film.

[0049] Figure 3 To show a schematic diagram of the structure of the first lens according to an embodiment of the present application. Figure 4A plan view showing a first lens according to an embodiment of the present application. As Figure 3 and Figure 4 shown, a first structural region 302 of the first lens 300 is formed around a first optical region 301. An altimetry region 303 is located in the first structural region 302 and may be an annular planar region. In this embodiment, the altimetry region 303 being an annular planar region can ensure that at any tilted attitude of the first lens 300 during actual operation, there is an appropriate beam emission angle and emission position, enabling the altimetry region 303 to reflect the ranging beam, thereby obtaining the first attitude of the first lens 300. The length w of the annular planar region in the axial direction of the first lens 300 is 0.2 mm or more. Appropriately increasing the beam reflection area of the altimetry region 303 can increase the reflection probability of the ranging beam and increase the amount of reflection. In this embodiment, there can be a relatively large distance between the reflection points of the ranging beam in the altimetry region to improve the detection accuracy of the tilted attitude of the first lens 300, which is beneficial to improving the overall manufacturing efficiency of the multi-lens assembly lens.

[0050] Figure 5 A plan view showing a first lens according to another embodiment of the present application. As Figure 5 shown, a first structural region 502 of the first lens 500 is formed around a first optical region 501. An altimetry region 503 is located in the first structural region 502, and the altimetry region 503 includes at least three mutually spaced planar regions. Figure 5 In Figure 6 a case where there are three separated planar regions is used as an example to illustrate the altimetry region 503. However, those skilled in the art can understand that the number of the altimetry regions 503 is not limited to this. Figure 6 A partially enlarged plan view showing a first lens according to another embodiment of the present application. As

[0051] shown, the length d of the planar region in the axial direction of the first lens 500 is 0.2 mm or more, and the length s of the planar region along the peripheral direction of the first lens 500 is 0.5 mm or more. In this embodiment, after emitting a ranging beam to the altimetry region 503, the ranging beams reflected from multiple mutually spaced planar regions can be obtained, and the tilted attitude of the first lens 500 can be accurately determined by three base points that can form a triangular region among multiple measurement positions. The relatively large planar area of the altimetry region can measure multiple positions and can effectively increase the reflectivity of the beam.

[0052] The altimetry region may be located on the side of the first lens facing away from the lens assembly. For example, when the first lens is between the ranging device and the lens assembly, the altimetry region is located on the side of the first lens facing away from the lens assembly.

[0053] The height measurement area is located on the side of the first lens close to the lens assembly. For example, when the lens assembly is between the first lens and the distance measuring device, the height measurement area is located on the side of the first lens close to the lens assembly.

[0054] The roughness of the height measurement area can be less than that of other areas of the first structural area. Excessive roughness of the height measurement area will cause a reduction in the light beam received by the distance measuring device at the same position, resulting in inaccurate detection of the tilt attitude of the lens. In this embodiment, the height measurement area is relatively smooth with a small roughness, which is beneficial to obtaining the tilt attitude of the first lens more accurately. The height measurement area can be a planar area, and the planar area can be perpendicular to the central axis of the first lens.

[0055] The height measurement area can be located at the outer edge of the first lens. Based on the coating process of the anti-reflection film, it is easier to avoid the anti-reflection film at the outer edge of the first lens.

[0056] This application also provides a manufacturing method for an optical lens. Figure 8 To show the flowchart of the manufacturing method for the optical lens according to the embodiments of this application. As Figure 8 shown, the manufacturing method includes the following steps.

[0057] Step 10: Obtain the first attitude of the first lens based on the ranging light beam reflected by the height measurement area of the first lens without the anti-reflection film coated.

[0058] Step 20: Adjust the angle of the first lens according to the first attitude so that the relative inclination angle between the first lens and the lens assembly is within a predetermined threshold.

[0059] Step 30: Pre-position the first lens, the lens assembly, and the photosensitive component so that an image formed by the first lens and the lens assembly can be obtained on the photosensitive component.

[0060] Step 40: Actively calibrate the relative position between the first lens and the lens assembly based on the formed image.

[0061] Step 50: Fix the first lens to the lens assembly based on the relative position between the first lens and the lens assembly after active calibration.

[0062] The predetermined threshold can be 0.1 degree. Additionally, according to the requirements of precision and tolerance, the predetermined threshold can be selected as 0.03 degree or 0.01 degree.

[0063] The manufacturing method of the optical lens provided by this application is used for manufacturing split lenses. In this embodiment, this manufacturing method can be used for manufacturing split lenses with a single lens and a lens assembly. The height measurement area without an anti-reflection coating can reflect more ranging light beams compared to the area coated with an anti-reflection coating, ensuring that the ranging device can receive enough ranging light beams to more accurately obtain the tilt attitude of the first lens. In the pre-positioning of step 30, if the tilt degree of the first lens relative to the lens assembly is large, or the inclination angle between the first lens and the lens assembly is greater than a certain threshold, when the first lens, the lens assembly, and the photosensitive assembly are arranged along the optical axis, it is difficult for the multi-lens assembly lens to form a normal image. At the same time, this will also result in too low image quality formed by the photosensitive assembly in step 30, and it is difficult to determine the adjustment amount that the first lens needs to be adjusted compared to the lens assembly in step 40. Therefore, in this embodiment, the angle of the first lens is adjusted more precisely according to the obtained first attitude, so that the relative inclination angle between the first lens and the lens assembly is within a predetermined threshold. This is not only beneficial for the subsequent pre-positioning step of lens manufacturing, where light forms an image through the first lens and the lens assembly, but also beneficial for improving the adjustment efficiency of the relative inclination angle between the first lens and the lens assembly during the lens manufacturing process.

[0064] In an exemplary embodiment, the angle of the first lens can be adjusted more precisely according to the obtained accurate first attitude, so that the relative inclination angle between the first lens and the lens assembly can preferably be within 0.03 degrees to better perform subsequent lens manufacturing. Further, the relative inclination angle between the first lens and the lens assembly can preferably be within 0.01 degrees.

[0065] In an exemplary embodiment, actively calibrating the relative position of the first lens and the lens assembly based on the formed image includes: the photosensitive assembly is powered on to obtain the images formed by multiple groups of lenses, and the imaging quality and its adjustment amount of the split lens are obtained through image algorithms such as SFR and MTF. Figure 9 To show the schematic diagram of the adjustment direction of the first lens relative to the lens assembly during the active calibration provided by the embodiment of this application. According to the adjustment amount, as shown in Figure 9 , the relative inclination angle of the first lens relative to the lens assembly can be adjusted along any axial direction of the x, y, and z axes, any direction perpendicular to the x, y, and z axes, or any rotation direction around the x, y, and z axes, or the relative inclination angle of the first lens relative to the lens assembly can be adjusted according to the possible combined directions of the above adjustment directions. Where u, v, and w respectively correspond to the rotation directions of the x, y, and z axes. During the adjustment process, to improve efficiency, the imaging quality of the lens, including optical parameters such as peak value, field curvature, and astigmatism, can be observed in real time. According to the deviation between the observed value and the target value of the relevant optical parameters obtained during the adjustment process, the relative inclination angle of the first lens relative to the lens assembly can be adjusted multiple times according to the above degrees of freedom until the imaging quality of the lens meets the requirements.

[0066] In an exemplary embodiment, an adhesive is further provided on the lens assembly. After step 20 or after step 40, an adhesive is provided on the lens assembly. The adhesive can be provided on the end face of the lens barrel of the lens assembly close to the first lens, or can be provided in the second structural area of the second lens closest to the first lens. The adhesive can include a light-curing adhesive. The adhesive is cured by at least one of visible light, ultraviolet light, baking, and the like.

[0067] In an exemplary embodiment, the height measurement area is an annular planar area, and the length of the annular planar area in the axial direction of the first lens is 0.2 mm or more. The height measurement area being an annular planar area can ensure that at any tilted posture of the first lens during actual operation, there is an appropriate beam emission angle and emission position, so that the height measurement area can reflect the ranging beam, thereby obtaining the first posture of the first lens. The length of the annular planar area in the axial direction of the first lens is 0.2 mm or more. Appropriately increasing the beam reflection area of the height measurement area can increase the reflection probability of the ranging beam and increase the reflection amount, so as to improve the measurement accuracy of the tilted posture of the first lens, which is beneficial to improving the manufacturing efficiency of the multi-lens assembly lens.

[0068] In an exemplary embodiment, the height measurement area includes at least three mutually spaced planar areas. After emitting a ranging beam to the height measurement area, the ranging beams reflected from multiple mutually spaced planar areas can be obtained, and the tilted posture of the first lens can be more accurately determined through three base points that can form a triangular area among multiple measurement positions.

[0069] In an exemplary embodiment, the length of the planar area in the axial direction of the first lens is 0.2 mm or more, and the length of the planar area in the circumferential direction of the first lens is 0.5 mm or more. A planar area with appropriate size helps to increase the reflection amount of the ranging beam and obtain a more accurate tilted posture of the first lens.

[0070] In an exemplary embodiment, the roughness of the height measurement area is less than the roughness of the adjacent area of the height measurement area. Excessive roughness of the beam reflection area will cause a reduction in the beam received by the ranging device at the same position, resulting in inaccurate detection of the tilted posture of the lens. In this embodiment, the height measurement area is relatively smooth with a small roughness, which is beneficial to obtaining a more accurate tilted posture of the first lens. The height measurement area is a planar area, and this planar area is perpendicular to the central axis of the first lens.

[0071] In an exemplary embodiment, adjusting the angle of the first lens according to the first posture includes obtaining the second posture of the lens assembly based on the ranging beam reflected by the lens assembly; and adjusting the angle of the first lens according to the first posture and the second posture so that there is a relative inclination angle within a predetermined threshold degree between the first lens and the lens assembly. In this embodiment, the ranging device for detecting the first posture of the detection lens or the second posture of the lens assembly can be one or two. The first posture of the lens and the second posture of the lens assembly can be detected simultaneously or separately one after another. According to the first posture and the second posture, the relative inclination angle between the first lens and the lens assembly can be adjusted more precisely.

[0072] In an exemplary embodiment, the manufacturing method further includes depositing an anti-reflection film on the height measurement area to further improve the reflectivity of the height measurement area to the ranging beam.

[0073] In an exemplary embodiment, the first lens includes a first optical area and a first structural area surrounding the first optical area, and the first structural area includes a height measurement area. The manufacturing method further includes: by controlling the evaporation angle of the evaporation source, depositing an anti-reflection film only on the first optical area and the part of the first structural area except the height measurement area. Figure 10 To show the schematic diagram of the coating method on the first lens provided by the embodiment of the present application. As Figure 10 shown, by controlling the evaporation angle α of the evaporation source, an anti-reflection film is directly deposited on the first lens. Since the evaporation angle α is controlled, an area with an axial direction width of at least 0.2 mm can be left uncoated with the anti-reflection film at the edge of the lens. This uncoated area with the anti-reflection film is used as the height measurement area of the first lens.

[0074] In an exemplary embodiment, the first lens includes a first optical area and a first structural area surrounding the first optical area, and the first structural area includes a height measurement area. The manufacturing method further includes: by setting a mask between the height measurement area and the evaporation source, depositing an anti-reflection film only on the first optical area and the part of the first structural area except the height measurement area. As Figure 10 shown, a jig or other shielding object is used as the mask 111 (such as photoresist) to cover the height measurement area of the first lens, and then an anti-reflection film is deposited on the first optical area of the first lens and the first structural area except the height measurement area. After the deposition is completed, the shielding object is removed. Using the method of using a jig to shield the height measurement area can more conveniently obtain the first lens with a height measurement area.

[0075] In the present application, the first posture of the first lens can be obtained by pulse laser ranging method, phase laser ranging method or triangulation laser ranging method.

[0076] The present application also provides a camera module. Figure 11 To show the schematic diagram of the structure of the camera module according to the embodiment of the present application. As Figure 11As shown in the figure, the camera module includes the optical lens 400, lens holder 401, filter 403, substrate 404, and photosensitive device 405 provided in the above embodiments. The optical lens 400 is fixed to the lens holder 401, and the lens holder 401 includes an opening 402 aligned with the lens of the optical lens 400. The filter 403 is fixed to the opening 402; the lens holder 401 is fixed to the substrate 404. The photosensitive device 405 is fixed on the substrate 404 and is wrapped by the lens holder 401 and the filter 403, so as to obtain a camera module after combining a single lens and a lens assembly. In the present application, there may be a non-zero included angle between the central axis of the first lens in the manufactured optical lens or camera module and the central axis of the lens assembly.

[0077] The above description is only a preferred embodiment of the present application and an explanation of the technical principles applied. Those skilled in the art should understand that the scope of the invention involved in the present application is not limited to the technical solution formed by the specific combination of the above technical features, and should also cover other technical solutions formed by any combination of the above technical features or their equivalent features without departing from the inventive concept. For example, the technical solutions formed by mutually replacing the above features with the (but not limited to) technical features having similar functions disclosed in the present application.

Claims

1. An optical lens, characterized in that, the optical lens comprises: a first lens, the first lens comprising a first optical region and a first structural region surrounding the first optical region, the first structural region comprising a height measurement region where an anti-reflection film is not deposited, regions of the first structural region other than the height measurement region being deposited with an anti-reflection film, the height measurement region reflecting a ranging light beam and being a planar region perpendicular to the central axis of the first lens; and a lens assembly, the lens assembly comprising a lens barrel and at least one second lens disposed within the lens barrel, the at least one second lens comprising a second optical region and a second structural region surrounding the second optical region, the first structural region being connected to an end face of the lens barrel close to the first lens or to the second structural region of the second lens closest to the first lens.

2. The optical lens according to claim 1, characterized in that, the height measurement region is an annular planar region.

3. The optical lens according to claim 2, characterized in that, the length of the annular planar region in the axial direction of the first lens is 0.2 mm or more.

4. The optical lens according to claim 1, characterized in that, the height measurement region comprises at least three mutually spaced planar regions.

5. The optical lens according to claim 4, characterized in that, the length of the planar region in the axial direction of the first lens is 0.2 mm or more, and the length of the planar region in the circumferential direction of the first lens is 0.5 mm or more.

6. The optical lens according to claim 1, characterized in that, the height measurement region is deposited with an anti-reflection film.

7. The optical lens according to claim 1, characterized in that, the height measurement region is located on a side of the first lens facing away from the lens assembly.

8. The optical lens according to claim 1, characterized in that, the height measurement region is located on a side of the first lens close to the lens assembly.

9. The optical lens according to claim 1, characterized in that, the roughness of the height measurement region is less than the roughness of other regions of the first structural region.

10. The optical lens according to claim 1, characterized in that, the height measurement region is located at the outer edge of the first lens.

11. A method for manufacturing an optical lens, characterized in that, it comprises: acquiring a first attitude of the first lens based on a ranging light beam reflected by a height measurement region of the first lens where an anti-reflection film is not deposited, the first lens comprising a first optical region and a first structural region surrounding the first optical region, the first structural region comprising the height measurement region, regions of the first structural region other than the height measurement region being deposited with an anti-reflection film, the height measurement region being a planar region perpendicular to the central axis of the first lens; adjusting the angle of the first lens according to the first attitude such that a relative inclination angle between the first lens and the lens assembly is within a predetermined threshold; pre-positioning the first lens, the lens assembly and a photosensitive component such that an image formed by the first lens and the lens assembly can be obtained on the photosensitive component; Actively calibrate the relative position of the first lens and the lens assembly based on the formed image; Fix the first lens to the lens assembly based on the relative position of the first lens and the lens assembly after the active calibration.

12. The manufacturing method according to claim 11, wherein, the height measurement area is an annular planar area, and the length of the annular planar area in the axial direction of the first lens is 0.2 mm or more.

13. The manufacturing method according to claim 11, wherein the height measurement area includes at least three mutually spaced planar areas.

14. The manufacturing method according to claim 13, wherein, the length of the planar area in the axial direction of the first lens is 0.2 mm or more, and the length of the planar area in the circumferential direction of the first lens is 0.5 mm or more.

15. The manufacturing method according to claim 11, wherein, the roughness of the height measurement area is less than the roughness of the adjacent area of the height measurement area.

16. The manufacturing method according to claim 11, wherein, adjusting the angle of the first lens according to the first attitude includes: acquiring the second attitude of the lens assembly based on the ranging light beam reflected by the lens assembly; and adjusting the angle of the first lens according to the first attitude and the second attitude so that the relative inclination angle between the first lens and the lens assembly is within a predetermined threshold.

17. The manufacturing method according to claim 11, wherein, the manufacturing method further includes: depositing an anti-reflection film on the height measurement area.

18. The manufacturing method according to claim 11, wherein, the manufacturing method further includes: depositing the anti-reflection film only on the portions of the first optical area and the first structural area except the height measurement area by controlling the evaporation angle of the evaporation source.

19. The manufacturing method according to claim 11, wherein, the manufacturing method further includes: depositing the anti-reflection film only on the portions of the first optical area and the first structural area except the height measurement area by providing a mask between the height measurement area and the evaporation source.

20. The manufacturing method according to claim 11, wherein, the predetermined threshold is 0.1 degree.

21. An imaging module, wherein, the imaging module includes: an optical lens according to any one of claims 1-10; a lens holder, the optical lens is fixed to the lens holder, and the lens holder includes an opening aligned with the lens of the optical lens; a filter, the filter is fixed to the opening; a substrate, the lens holder is fixed to the substrate; and a photosensitive device, the photosensitive device is fixed on the substrate and is wrapped by the lens holder and the filter.

Images