Optical module, camera and electronic equipment

Abstract

The utility model relates to an optical module, a camera and electronic equipment, the optical module comprises a first lens group, a second lens group and a third lens group, the first lens group is arranged at an object plane end, the third lens group is arranged at an image plane end, and the second lens group is arranged between the first lens group and the third lens group. Wherein light sequentially passes through the first lens group, the second lens group and the third lens group and then is imaged at the image plane end, the first lens group is fixedly arranged, and the second lens group and the third lens group can move relative to the first lens group along the optical axis direction of the optical module. The focal length of the optical module is continuously adjusted in the interval of the short focal length, the medium-long focal length and the long focal length. According to the invention, the second lens group and the third lens group are arranged to be capable of moving relative to the first lens group, the continuous change of the focal length can be realized without arranging a plurality of cameras on the electronic equipment, the production cost is reduced, the imaging requirements under different focal lengths can be met, and the photographing experience of a user is improved.

Description

Technical Field

[0001] This disclosure relates to the field of optical imaging technology, and in particular to an optical module, camera, and electronic device. Background Technology

[0002] As camera technology matures, zoom cameras are increasingly used in electronic devices. Currently, periscope cameras are commonly used in mobile terminals, tablets, and other electronic devices due to their advantages such as high dust and water resistance and small footprint. However, due to structural limitations, periscope cameras typically have a fixed focal length or can only zoom within a single focal length range, such as only at telephoto focal lengths. Therefore, multiple cameras are usually required to cover different focal lengths, resulting in higher production costs. This hinders the lightweight and miniaturized design of electronic devices and makes it difficult to meet diverse user shooting needs. Summary of the Invention

[0003] To overcome the problems existing in related technologies, this disclosure provides an optical module, a camera, and an electronic device.

[0004] According to a first aspect of this disclosure, an optical module is provided, comprising:

[0005] The first lens group is located at the object surface end;

[0006] The third lens group is located at the image plane end.

[0007] The second lens group is disposed between the first lens group and the third lens group;

[0008] In this process, light passes sequentially through the first lens group, the second lens group, and the third lens group to form an image at the image plane. The first lens group is fixedly installed, while the positions of the second and third lens groups can be moved relative to the first lens group along the optical axis of the optical module to continuously adjust the focal length of the optical module within the range of short focal length, medium focal length, and long focal length.

[0009] In one possible implementation, the ratio of the focal length of the second lens group to the focal length of the third lens group is in the range of -0.9 to -0.8.

[0010] In one possible implementation, the ratio of the combined focal length of the first lens group to the effective focal length of the short focal length ranges from -12.5 to -11, and the ratio of the combined focal length of the first lens group to the effective focal length of the long focal length ranges from -5.5 to -4.5; and / or,

[0011] The ratio of the combined focal length of the second lens group to the effective focal length of the short focal length ranges from -2 to -1, and the ratio of the combined focal length of the second lens group to the effective focal length of the long focal length ranges from -1.2 to -0.2; and / or,

[0012] The ratio of the combined focal length of the third lens group to the effective focal length of the short focal length ranges from 0.2 to 1.2, and the ratio of the combined focal length of the third lens group to the effective focal length of the long focal length ranges from 0.1 to 0.8.

[0013] In one possible implementation, the ratio of the short focal length to the entrance pupil diameter is less than or equal to 1.8, the ratio of the medium telephoto focal length to the entrance pupil diameter is greater than 1.8 and less than or equal to 2.5, and the ratio of the telephoto focal length to the entrance pupil diameter is greater than 2.5 and less than or equal to 3.5.

[0014] In one possible implementation, the optical module further includes an optical sensor disposed at the image plane end;

[0015] The distance between the first lens group and the second lens group ranges from 1.75 mm to 0.21 mm; and / or,

[0016] The distance between the second lens group and the third lens group ranges from 1.7 mm to 6 mm; and / or,

[0017] The distance between the third lens group and the optical sensor ranges from 0.27 mm to 6.6 mm.

[0018] In one possible implementation, the first lens group includes at least one lens, and the second and third lens groups each include at least two lenses.

[0019] In one possible implementation, the first lens group includes a first lens, the second lens group includes a second lens, a third lens, a fourth lens and a fifth lens arranged sequentially along the direction of light propagation in the optical module, and the third lens group includes a sixth lens, a seventh lens, an eighth lens, a ninth lens, a tenth lens and an eleventh lens arranged sequentially along the direction of light propagation in the optical module.

[0020] The first lens has a positive optical power, the second lens has a negative optical power, and the eleventh lens has a negative optical power.

[0021] In one possible implementation, the first lens includes a meniscus lens, with the concave side of the first lens facing the image plane end; and / or,

[0022] The second lens includes a meniscus lens with its concave side facing the object surface; the third lens includes a biconcave lens; the fourth lens includes a meniscus lens with its concave side facing the object surface; the fifth lens includes a biconcave lens; and the sixth lens includes a biconvex lens; and / or,

[0023] The seventh lens includes a biconvex lens, the eighth lens includes a biconcave lens, the ninth lens includes a meniscus lens with the concave side of the ninth lens facing the image plane, the tenth lens includes a meniscus lens with the concave side of the tenth lens facing the object plane, and the eleventh lens includes a bow-shaped lens with the concave side of the eleventh lens facing the object plane.

[0024] In one possible implementation, the surface of the first lens facing the object plane is a first surface, and the surface of the first lens facing the image plane is a second surface. The ratio of the sum of the radii of curvature of the first surface and the second surface to the difference between the radii of curvature of the first surface and the second surface is in the range of 30 to 35; and / or,

[0025] The surface of the eleventh lens facing the object plane is the third surface, and the surface of the eleventh lens facing the image plane is the fourth surface. The ratio of the sum of the radii of curvature of the third surface and the fourth surface to the difference between the radii of curvature of the third surface and the fourth surface is in the range of -10 to -8.

[0026] In one possible implementation, the ratio of the focal length of the first lens to the combined focal length of the second lens group ranges from 7 to 7.5; and / or,

[0027] The combined focal length of the first lens and the second lens group ranges from -12 to -10.

[0028] According to a second aspect of this disclosure, a camera is provided, including an optical module as described in the first aspect of this disclosure.

[0029] According to a third aspect of this disclosure, an electronic device is provided, including an optical module as described in the first aspect of this disclosure or a camera as described in the second aspect of this disclosure.

[0030] The beneficial effects of this disclosure are as follows: This disclosure sets the second lens group and the third lens group to be movable relative to the first lens group, so that the focal length can be continuously changed without setting up multiple cameras, which helps to reduce production costs, while meeting the imaging needs under different focal lengths and improving the user's photography experience.

[0031] It should be understood that the above general description and the following detailed description are exemplary and explanatory only, and are not intended to limit this disclosure. Attached Figure Description

[0032] The accompanying drawings, which are incorporated in and form a part of this specification, illustrate embodiments consistent with this disclosure and, together with the description, serve to explain the principles of this disclosure.

[0033] Figure 1 This is a schematic diagram illustrating the structure of an optical module with a short focal length according to an exemplary embodiment.

[0034] Figure 2 This is a schematic diagram illustrating the structure of an optical module with a medium to long focal length according to an exemplary embodiment.

[0035] Figure 3 This is a schematic diagram illustrating the structure of an optical module with a long focal length according to an exemplary embodiment.

[0036] Figure 4 This is a schematic diagram illustrating the propagation direction of light in an optical module according to an exemplary embodiment.

[0037] Figure 5 This is an optical distortion curve of the optical module of this embodiment under a short focal length.

[0038] Figure 6 This is an optical distortion curve of the optical module of this embodiment at a medium to long focal length.

[0039] Figure 7 This is an optical distortion curve of the optical module of this embodiment at a long focal length.

[0040] Figure 8 This is a chromatic aberration curve of the optical module of this embodiment at a short focal length.

[0041] Figure 9 This is a chromatic aberration curve of the optical module of this embodiment at medium to long focal lengths.

[0042] Figure 10 This is a chromatic aberration curve of the optical module of this embodiment at a long focal length.

[0043] Figure 11 This is a graph showing the optical transfer function of the optical module of this embodiment at different field of view angles under short focal length.

[0044] Figure 12 This is a graph showing the optical transfer function of the optical module of this embodiment at different field of view angles under medium to long focal lengths.

[0045] Figure 13 This is a graph showing the optical transfer function of the optical module of this embodiment at different field of view angles under long focal length. Detailed Implementation

[0046] Exemplary embodiments will now be described in detail, examples of which are illustrated in the accompanying drawings. When the following description relates to the drawings, unless otherwise indicated, the same numerals in different drawings denote the same or similar elements. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with this disclosure. Rather, they are merely examples of apparatuses and methods consistent with some aspects of this disclosure as detailed in the appended claims.

[0047] As camera technology matures, zoom cameras are increasingly used in electronic devices. Currently, periscope cameras are commonly used in mobile terminals, tablets, and other electronic devices due to their advantages such as high dust and water resistance and small footprint. However, due to structural limitations, periscope cameras typically have a fixed focal length or can only zoom within a single focal length range, such as only at telephoto focal lengths. Therefore, multiple cameras are usually required to cover different focal lengths, resulting in higher production costs. This hinders the lightweight and miniaturized design of electronic devices and makes it difficult to meet diverse user shooting needs.

[0048] To address the aforementioned technical problems, this disclosure proposes an optical module, a camera, and an electronic device. The optical module of this disclosure configures the second and third lens groups to move relative to the first lens group along the optical axis of the optical module. This eliminates the need for multiple cameras and enables continuous changes in focal length, thereby reducing production costs and meeting imaging requirements at different focal lengths, thus enhancing the user's photography experience.

[0049] According to an exemplary embodiment, such as Figures 1-4 As shown, this disclosure provides an optical module applied in a camera, capable of continuous zoom and imaging. Exemplarily, the optical module of this disclosure is applied to a periscope lens. Figure 4 Taking the orientation shown as an example, the light ray emitted from the object surface end 41 is the first light ray S1, and the first light ray S1 is... Figure 4The first ray S1 enters the right-angle prism 60 from the lower left, moving vertically upwards. After one reflection within the prism 60, the light path is folded 90°, resulting in a second ray S2. This second ray S2 then enters the first lens group 10 horizontally to the right, passing sequentially through the second lens group 20 and the third lens group 30 before reaching the image plane 42 for imaging. In periscope lenses, due to the folding of the light path, they occupy less space compared to traditional lenses, making them widely used in the shooting of portable electronic devices such as mobile terminals and tablets. Of course, it is understood that the application scenarios of the optical module of this disclosure are not limited to the examples listed above. Those skilled in the art can apply the optical module of this disclosure to other types of cameras and electronic devices according to actual needs. For example, in some other embodiments, the right-angle prism 60 can be removed, and only the first lens group 10, the second lens group 20, and the third lens group 30 are included.

[0050] The optical module includes a first lens group 10, a second lens group 20, and a third lens group 30. The first lens group 10 is disposed at the object plane end 41, the third lens group 30 is disposed at the image plane end 42, and the second lens group 20 is disposed between the first lens group 10 and the third lens group 30. During imaging, light passes sequentially through the first lens group 10, the second lens group 20, and the third lens group 30 before forming an image at the image plane end 42. Figures 1-3 Taking the orientation shown as an example, the object surface end 41 is located at... Figures 1-3 On the left side of the image plane, image plane end 42 is located Figures 1-3 On the right side of the image. The first lens group 10 is fixed in position relative to the object surface end 41, while the positions of the second lens group 20 and the third lens group 30 can be moved relative to the first lens group 10 along the optical axis s of the optical module, thereby enabling the focal length of the optical module to be continuously adjusted within the range of short focal length, medium telephoto focal length, and telephoto focal length.

[0051] In this system, the focal length of the optical module changes with the spacing between the individual lens groups. For example... Figure 1 As shown, when the distance between the first lens group 10 and the second lens group 20 is large, and the distance between the second lens group 20 and the third lens group 30 is also large, the overall focal length of the optical module is small, and the optical module is in a short focal length state. Figure 2 As shown, when the distance between the first lens group 10 and the second lens group 20 is large, and the distance between the second lens group 20 and the third lens group 30 is small, the overall focal length of the optical module is greater than the short focal length, and the optical module is at a medium-long focal length. Figure 3As shown, when the distance between the first lens group 10 and the second lens group 20 is small, and the distance between the second lens group 20 and the third lens group 30 is also small, the overall focal length of the optical module is large, and the optical module is at a telephoto focal length. Specifically, by adjusting the distance between the first lens group 10 and the second lens group 20, and the distance between the second lens group 20 and the third lens group 30, continuous adjustment of the overall focal length of the optical module can be achieved. This embodiment of the present disclosure does not impose excessive restrictions on the adjustment range of the distance between lens groups in the optical module or the overall focal length range of the optical module, as long as continuous adjustment of the focal length within the short focal length, medium telephoto focal length, and telephoto focal length ranges can be achieved.

[0052] In the optical module of this disclosure embodiment, by setting the second lens group and the third lens group to be movable relative to the first lens group along the optical axis direction of the optical module, the focal length of the optical module can be continuously changed without setting multiple cameras, which helps to reduce production costs and at the same time meet the imaging needs under different focal lengths, thus improving the user's photography experience.

[0053] In some embodiments, the combined focal length F1 of the first lens group 10, the combined focal length F2 of the second lens group 20, and the combined focal length F3 of the third lens group 30 all satisfy a certain relationship with the effective focal length efl1 of the short focal length and the effective focal length efl2 of the long focal length of the optical module, so as to achieve the effect of continuous zoom of the optical module.

[0054] In one example, the ratio of the combined focal length F1 of the first lens group 10 to the effective focal length efl1 of the short focal length ranges from -12.5 to -11, and the ratio of the combined focal length F1 of the first lens group 10 to the effective focal length efl2 of the long focal length ranges from -5.5 to -4.5. That is, -12.5 < F1 / efl1 < -11, and -5.5 < F1 / efl1 < -4.5.

[0055] In one example, the ratio of the combined focal length F2 of the second lens group 20 to the effective focal length efl1 of the short focal length ranges from -2 to -1, and the ratio of the combined focal length F2 of the second lens group 20 to the effective focal length efl2 of the long focal length ranges from -1.2 to -0.2. That is, -2 < F2 / efl1 < -1, and -1.2 < F2 / efl1 < -0.2.

[0056] In one example, the ratio of the combined focal length F3 of the third lens group 30 to the effective focal length efl1 of the short focal length ranges from 0.2 to 1.2, and the ratio of the combined focal length F3 of the third lens group 30 to the effective focal length efl2 of the long focal length ranges from 0.1 to 0.8. That is, 0.2 < F3 / efl1 < 1.2, and 0.1 < F3 / efl1 < 0.8.

[0057] In one example, the ratio of the combined focal length F2 of the second lens group 20 to the combined focal length F3 of the third lens group 30 ranges from -0.9 to -0.8, that is, -0.9 < F2 / F3 < -0.8.

[0058] In some embodiments, the F-numbers for short focal lengths, medium telephoto focal lengths, and telephoto focal lengths of the optical module have a certain range. The F-number, also known as the aperture factor, is commonly represented by FNO or F / #. The F-number is the reciprocal of the relative aperture, which is the ratio of the effective aperture (i.e., the entrance pupil diameter) to the focal length. Therefore, the F-number is the ratio of the focal length to the entrance pupil diameter. The F-number describes the light-gathering capability of the lens; a larger F-number indicates stronger light-gathering capability, and vice versa.

[0059] In one example, the F-coefficient of the optical module ranges from 1.8 to 3.5. Specifically, the F-coefficient of the optical module at a short focal length is less than or equal to 1.8, meaning the ratio of the short focal length to the entrance pupil diameter is less than or equal to 1.8; the F-coefficient of the optical module at a medium to long focal length is greater than 1.8 and less than or equal to 2.5, meaning the ratio of the medium to long focal length to the entrance pupil diameter is greater than 1.8 and less than or equal to 2.5; and the F-coefficient of the optical module at a long focal length is greater than 2.5 and less than or equal to 3.5, meaning the ratio of the long focal length to the entrance pupil diameter is greater than 2.5 and less than or equal to 3.5.

[0060] In some embodiments, the optical module further includes an optical sensor 51 and a filter 52. The optical sensor 51 is disposed at the image plane end 42. After the light from the object plane end 41 enters the first lens group 10, it passes through the second lens group 20 and the third lens group 30 in sequence, and then is filtered by the filter 52 before finally reaching the optical sensor 52 for imaging.

[0061] In some embodiments, the distance between the first lens group 10 and the second lens group 20, the distance between the second lens group 20 and the third lens group 30, and the distance between the third lens group 30 and the optical sensor 51 all have a certain adjustment range, so that the focal length of the optical module can be continuously adjusted within the range of short focal length, medium focal length, and long focal length.

[0062] In one example, such as Figures 1-3 As shown, the distance between the first lens group 10 and the second lens group 20 ranges from 1.75mm to 0.21mm.

[0063] In one example, such as Figures 1-3 As shown, the distance between the second lens group 20 and the third lens group 30 ranges from 1.7 mm to 6 mm.

[0064] In one example, such as Figures 1-3As shown, the distance between the third lens group 30 and the optical sensor 51 ranges from 0.27 mm to 6.6 mm.

[0065] In some embodiments, the first lens group 10 includes at least one lens, and the second lens group 20 and the third lens group 30 each include at least two lenses. Those skilled in the art can adjust the number of lenses in the first lens group 10, the second lens group 20, and the third lens group 30 according to actual needs; this disclosure does not impose excessive limitations in this regard.

[0066] In some embodiments, such as Figures 1-3 As shown, the first lens group 10 includes one lens, the second lens group 20 includes four lenses, and the third lens group 30 includes six lenses.

[0067] The first lens group 10 includes a first lens 11; along the direction of light propagation in the optical module, that is... Figures 1-3 As shown from left to right, the second lens group 20 includes a second lens 21, a third lens 22, a fourth lens 23, and a fifth lens 24 arranged in sequence; along the direction of light propagation in the optical module, the third lens group 30 includes a sixth lens 31, a seventh lens 32, an eighth lens 33, a ninth lens 34, a tenth lens 35, and an eleventh lens 36 arranged in sequence.

[0068] In one example, the first lens 11 has a positive focal power, the second lens 21 has a negative focal power, and the eleventh lens 36 has a negative focal power. Focal power is an important parameter characterizing the ability of an optical system to deflect light. In optical system design, focal power is a crucial parameter that helps evaluate the system's light-deflecting ability, thereby optimizing system performance. Positive lenses focus light, while negative lenses diverge light. This embodiment does not impose excessive restrictions on the focal power of other lenses in the optical module; those skilled in the art can adjust the focal power and focal length of each lens according to the actual optical path design requirements.

[0069] In some embodiments, the individual lenses in the optical module may have different shapes.

[0070] In the first lens group 10, the first lens 11 may include a meniscus lens, with the concave side of the first lens 11 facing the image plane end 42.

[0071] In the second lens group 20, the second lens 21 may include a meniscus lens with the concave side of the second lens 21 facing the object surface end 41; the third lens 22 may include a biconcave lens; the fourth lens 23 may include a meniscus lens with the concave side of the fourth lens 23 facing the object surface end; and the fifth lens 24 may include a biconcave lens.

[0072] In the third lens group 30, the sixth lens 31 may include a biconvex lens; the seventh lens 32 may include a biconvex lens; the eighth lens 33 may include a biconcave lens; the ninth lens 34 includes a meniscus lens with its concave side facing the image plane end 42; the tenth lens 35 includes a meniscus lens with its concave side facing the object plane end 41; and the eleventh lens 36 includes a bow-shaped lens with its concave side facing the object plane end 41.

[0073] In one example, the surface of the first lens 11 facing the object plane is the first surface, and the surface of the first lens 11 facing the image plane is the second surface. The ratio of the sum of the radii of curvature R11 of the first surface and the radii of curvature R12 of the second surface to the difference between the radii of curvature R11 of the first surface and the radii of curvature R12 of the second surface is in the range of 30 to 35. That is, 30 < (R11 + R12) / (R11 - R12) < 35.

[0074] In one example, the surface of the eleventh lens 36 facing the object plane is the third surface, and the surface of the eleventh lens 36 facing the image plane is the fourth surface. The ratio of the sum of the radii of curvature R111 of the third surface and the radii of curvature R112 of the fourth surface to the difference between the radii of curvature R111 of the third surface and the radii of curvature R112 of the fourth surface ranges from -10 to -8. That is, -10 < (R111 + R112) / (R111 - R112) < -8.

[0075] In some embodiments, in order to reduce the entrance pupil diameter of the lens, the ratio of the focal length of the first lens 11 to the combined focal length of the second lens group 20, as well as the combined focal length of the first lens 11 and the second lens group 20, are subject to certain range requirements. Specifically, the ratio of the focal length of the first lens 11 to the combined focal length of the second lens group 20 is in the range of 7 to 7.5, and the combined focal length of the first lens and the second lens group is in the range of -12mm to -10mm.

[0076] In some embodiments, Table 1 below provides reference examples of the surface shape and related parameters of each lens in the present disclosure. Those skilled in the art can adjust the surface shape, radius of curvature, thickness and other parameters of each lens based on the examples of the present disclosure, and the present disclosure does not impose any special limitations on this.

[0077] Table 1. Surface-related parameters of each lens in the optical module.

[0078]

[0079]

[0080] In Table 1 above, the light-incident side and the light-exit side refer to the surface on which the light enters each lens along the direction of light propagation in the optical module; the light-incident side surface is the surface on which the light exits each lens. Taking the second lens 21 as an example, the light-incident side of the second lens 21 is a curved surface with a radius of curvature of -15.03 mm and a thickness of 0.65 mm. The light-exit side of the second lens 21 is also a curved surface with a radius of curvature of -9.88 and a thickness of 0.03 mm. The relevant parameters of other lenses can also be referred to in Table 1 above, and will not be elaborated further in this embodiment.

[0081] In addition, in Table 1 above, D1 is the interval between the first lens 11 and the second lens 21, D2 is the interval between the fifth lens 24 and the sixth lens 31, and D3 is the interval between the eleventh lens 36 and the image plane end 42, that is, between the eleventh lens 36 and the optical sensor 51. The values ​​of D1, D2, and D3 will change with the overall focal length of the optical module. For example, the correspondence between D1, D2, and D3 and the focal length of the optical module is shown in Table 2 below.

[0082] Table 2. Correspondence between focal lengths of D1, D2, and D3 and optical modules.

[0083] D1(mm) D2 (mm) D3 (mm) short focal length 3.64 4.99 0.27 medium to long focal length 3.77 1.41 3.72 telephoto focal length 2.1 0.18 6.63

[0084] As shown in Table 2 above, taking the values ​​of D1, D2, and D3 at a short focal length as an example, when the optical module has a short focal length, the value of D1 can be 3.64mm, the value of D2 can be 4.99mm, and the value of D3 can be 0.27mm. When the optical module has a medium-long focal length or a long focal length, the values ​​of D1, D2, and D3 can also be referred to in Table 2 above, and will not be elaborated further in this embodiment.

[0085] Of course, it is understood that the parameters shown in Tables 1 and 2 above are only examples. The number of lenses in the optical module, the optical power, focal length, shape and other parameters of each lens can be set by those skilled in the art according to actual needs. This disclosure does not impose too many restrictions on this.

[0086] In some embodiments, the lenses in the optical module can be made of high refractive index or high Abbe number materials. Both refractive index and Abbe number are important parameters expressing the optical performance of a lens. The higher the refractive index of a lens, the stronger its ability to refract incident light; the lower the refractive index, the weaker its ability to refract incident light. The Abbe number is an indicator of the degree of dispersion of a lens. Generally, the higher the refractive index of the medium, the more severe the dispersion, and the smaller the Abbe number; conversely, the lower the refractive index, the less severe the dispersion, and the larger the Abbe number.

[0087] In one example, the first lens 11, the third lens 22, the fifth lens 24, the sixth lens 31, the seventh lens 32, the ninth lens 34, and the eleventh lens 36 are made of high Abbe number materials, while the second lens 21, the fourth lens 23, the eighth lens 33, and the tenth lens 35 are made of high refractive index materials.

[0088] In some embodiments, each lens in the optical module can be made of glass or plastic, or a combination of both. Of course, it is understood that the lenses can also be made of other transparent materials such as resin or quartz. Those skilled in the art can choose according to actual needs, and this disclosure does not impose excessive limitations in this regard.

[0089] The following will combine Figures 5-13 The technical effects of the optical module in the embodiments of this disclosure will be explained.

[0090] like Figures 5-7 As shown, Figure 5 This is a graph showing the optical distortion of the optical module in this embodiment at a short focal length. Figure 6 This is a graph showing the optical distortion of the optical module in this embodiment at a medium to long focal length. Figure 7 This is a graph showing the optical distortion of the optical module of this embodiment at a long focal length. Figures 5-7 In the figure, the horizontal axis represents optical distortion in percentage (%), and the vertical axis represents image height in mm. Figure 5 Curve a1 in the figure represents the optical distortion of the optical module of this embodiment at different image heights under short focal lengths. Figure 6 Curve a2 in the figure represents the optical distortion of the optical module of this embodiment at different image heights at medium to long focal lengths. Figure 7 Curve a3 in the figure represents the optical distortion of the optical module of this embodiment at different image heights at long focal lengths. According to Figures 5-7 It can be seen that, under different focal lengths and image heights, the optical distortion can be kept within 2.5%, which meets the optical distortion requirements and has good imaging quality.

[0091] like Figures 8-10 As shown, Figure 8 This is a chromatic aberration curve of the optical module of this embodiment at a short focal length. Figure 9 This is a chromatic aberration curve of the optical module of this embodiment at a medium to long focal length. Figure 10 This is a chromatic aberration curve of the optical module of this embodiment at a long focal length. Figures 8-10 In the diagram, the horizontal axis represents chromatic aberration in centimeters, and the vertical axis represents the field of view. Figure 8 The figure represents the chromatic aberration of the optical module of this embodiment at different fields of view under short focal lengths. Figure 9This indicates the chromatic aberration of the optical module in this embodiment at different fields of view under medium to long focal lengths. Figure 10 This indicates the chromatic aberration of the optical module in this embodiment at different fields of view with a telephoto focal length. According to... Figures 8-10 As can be seen, under different focal lengths and fields of view, the chromatic aberration of the optical module in this embodiment is within ±0.2cm (i.e. ±20mm), which can meet the commonly used chromatic aberration standard of within ±80mm, and has a good chromatic aberration correction effect and high imaging quality.

[0092] like Figures 11-13 As shown, Figure 11 This is a graph showing the optical transfer function of the optical module of this embodiment at different field of view angles under short focal lengths. Figure 12 This is a graph showing the optical transfer function of the optical module of this embodiment at different field of view angles under medium to long focal lengths. Figure 13 This is a graph showing the optical transfer function of the optical module of this disclosure at different field of view angles under a long focal length. Figures 11-13 In the diagram, the horizontal axis represents frequency, and the vertical axis represents the optical transfer function.

[0093] At short focal lengths, such as Figure 11 As shown, curve b1 represents the theoretical limit of the optical transfer function at short focal lengths, curve c1 represents the optical transfer function at 0 field of view (0°), curves d1 and e1 represent the meridional modulation transfer function and sagittal modulation transfer function at 0.4 field of view (4.29°), respectively, and curves f1 and g1 represent the meridional modulation transfer function and sagittal modulation transfer function at 0.6 field of view (6.13°), respectively. At medium to long focal lengths, as... Figure 12 As shown, curve b2 represents the theoretical limit of the optical transfer function at medium to long focal lengths, curve c2 represents the optical transfer function at 0 field of view (0°), curves d2 and e2 represent the meridional modulation transfer function and sagittal modulation transfer function at 0.4 field of view (4.29°), respectively, and curves f2 and g2 represent the meridional modulation transfer function and sagittal modulation transfer function at 0.6 field of view (6.13°), respectively. At long focal lengths, as... Figure 13 As shown, curve b3 represents the theoretical limit of the optical transfer function at a long focal length, curve c3 represents the optical transfer function at 0 field of view (0°), curves d3 and e3 represent the meridional modulation transfer function and sagittal modulation transfer function at 0.4 field of view (4.29°), respectively, and curves f3 and g3 represent the meridional modulation transfer function and sagittal modulation transfer function at 0.6 field of view (6.13°), respectively.

[0094] Combination Figures 11-13It can be seen that, under different focal lengths and different fields of view, the optical transfer function curves of the optical module of this disclosure embodiment are all close to the theoretical limit value, which proves that the optical module of this disclosure embodiment has high imaging quality.

[0095] According to an exemplary embodiment, such as Figures 1-4 As shown, this disclosure provides a camera, including the optical module described in the above embodiments. The camera can be a periscope camera and can be used in electronic devices with shooting functions such as cameras, mobile terminals, and tablet computers.

[0096] According to an exemplary embodiment, such as Figures 1-4 As shown in the embodiments of this disclosure, an electronic device is provided, which includes the optical module or camera described in the above embodiments. The electronic device can be, for example, a camera, a mobile terminal, a tablet computer, or other electronic devices with shooting capabilities. By using the camera or optical module described above, only one camera or a set of optical modules is needed to achieve continuous focal length adjustment between short focal length, medium telephoto focal length, and telephoto focal length. This satisfies the user's shooting needs while facilitating the miniaturization of the electronic device and improving the user experience.

[0097] Other embodiments of this disclosure will readily occur to those skilled in the art upon consideration of the specification and practice of the disclosure herein. This application is intended to cover any variations, uses, or adaptations of this disclosure that follow the general principles of this disclosure and include common knowledge or customary techniques in the art not disclosed herein. The specification and examples are to be considered exemplary only, and the true scope and spirit of this disclosure are indicated by the claims.

[0098] It should be understood that this disclosure is not limited to the precise structures described above and shown in the accompanying drawings, and various modifications and changes can be made without departing from its scope. The scope of this disclosure is limited only by the appended claims.

Claims

1. An optical module characterized by comprising: Comprise: a first lens group arranged at an object plane end; a third lens group; arranged at an image plane end; a second lens group arranged between the first lens group and the third lens group; wherein light rays pass through the first lens group, the second lens group and the third lens group in sequence to form an image at the image plane end, the first lens group is fixedly arranged, and the second lens group and the third lens group are movable relative to the first lens group along an optical axis direction of the optical module to continuously adjust the focal length of the optical module in a short focal length range, a medium-long focal length range and a long focal length range.

2. The optical module according to claim 1, wherein The ratio of the focal length of the second lens group to the focal length of the third lens group ranges from -0.9 to -0.

8.

3. The optical module according to claim 1, wherein The ratio of the combined focal length of the first lens group to the effective focal length of the short focal length ranges from -12.5 to -11, and the ratio of the combined focal length of the first lens group to the effective focal length of the long focal length ranges from -5.5 to -4.5; and / or, The ratio of the combined focal length of the second lens group to the effective focal length of the short focal length ranges from -2 to -1, and the ratio of the combined focal length of the second lens group to the effective focal length of the long focal length ranges from -1.2 to -0.2; and / or, The ratio of the combined focal length of the third lens group to the effective focal length of the short focal length ranges from 0.2 to 1.2, and the ratio of the combined focal length of the third lens group to the effective focal length of the long focal length ranges from 0.1 to 0.

8.

4. The optical module according to claim 1, wherein The ratio of the short focal length to the entrance pupil diameter is less than or equal to 1.8, the ratio of the medium-long focal length to the entrance pupil diameter is greater than 1.8 and less than or equal to 2.5, and the ratio of the long focal length to the entrance pupil diameter is greater than 2.5 and less than or equal to 3.

5.

5. The optical module according to claim 1, wherein The optical module further comprises an optical sensor arranged at the image plane end; The distance between the first lens group and the second lens group ranges from 1.75 mm to 0.21 mm; and / or, The distance between the second lens group and the third lens group ranges from 1.7 mm to 6 mm; and / or, The distance between the third lens group and the optical sensor ranges from 0.27 mm to 6.6 mm.

6. The optical module according to claim 1, wherein The first lens group comprises at least one lens, and the second lens group and the third lens group each comprise at least two lenses.

7. The optical module according to claim 6, wherein The first lens group comprises a first lens, the second lens group comprises a second lens, a third lens, a fourth lens and a fifth lens arranged in sequence along the propagation direction of light rays in the optical module, and the third lens group comprises a sixth lens, a seventh lens, an eighth lens, a ninth lens, a tenth lens and an eleventh lens arranged in sequence along the propagation direction of light rays in the optical module; wherein the optical power of the first lens is positive, the optical power of the second lens is negative, and the optical power of the eleventh lens is negative.

8. The optical module according to claim 7, wherein The first lens comprises a meniscus lens, and the concave side of the first lens faces the image plane end; and / or, the second lens comprises a meniscus lens, a concave side of the second lens faces the object side, the third lens comprises a biconcave lens, the fourth lens comprises a meniscus lens, a concave side of the fourth lens faces the object side, the fifth lens comprises a biconcave lens, the sixth lens comprises a biconvex lens; and / or, the seventh lens comprises a biconvex lens, the eighth lens comprises a biconcave lens, the ninth lens comprises a meniscus lens, a concave side of the ninth lens faces the image side, the tenth lens comprises a meniscus lens, a concave side of the tenth lens faces the object side, the eleventh lens comprises a chevron lens, a concave side of the eleventh lens faces the object side.

9. The optical module according to claim 7, wherein a surface of the first lens facing the object side is a first surface, a surface of the first lens facing the image side is a second surface, a ratio of a sum of the curvature radii of the first surface and the second surface to a difference of the curvature radii of the first surface and the second surface ranges from 30 to 35; and / or, a surface of the eleventh lens facing the object side is a third surface, a surface of the eleventh lens facing the image side is a fourth surface, a ratio of a sum of the curvature radii of the third surface and the fourth surface to a difference of the curvature radii of the third surface and the fourth surface ranges from -10 to -8.

10. The optical module of claim 7, wherein a ratio of a focal length of the first lens to a combined focal length of the second lens group ranges from 7 to 7.5; and / or, the combined focal length of the first lens and the second lens group ranges from -12 to -10.

11. A camera, characterized by An optical module comprising any one of the optical modules of claims 1 to 10.

12. An electronic device, comprising: A camera comprising any one of the optical modules of claims 1 to 10 or the camera of claim 11.

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