Optical module, camera and electronic equipment

Abstract

The utility model relates to an optical module, a camera and an electronic device, the optical module comprises a first lens group, a second lens group and a prism, the first lens group is arranged at an object plane end, the second lens group is arranged at an image plane end, and the first lens group and the second lens group are arranged at the same side of the prism; wherein the light of the object plane end enters the prism through the first lens group, enters the second lens group after being reflected for multiple times in the prism, and is emitted to the image plane end for imaging after passing through the second lens group. According to the optical module, the first lens group and the second lens group are arranged, and the prism is used for reflecting and turning the light path for multiple times, so that the size of the optical module is smaller, the design requirements of imaging quality and miniaturization are considered, and the use experience of a user is improved.

Description

Technical Field

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

[0002] As technology continues to advance, users' demands for electronic devices are becoming increasingly diverse. Therefore, to improve the user experience, the cameras of electronic devices need to balance the design requirements of miniaturization with the functional requirements of high image quality. In related camera technologies, right-angle prisms are typically used to fold the optical path by 90° to reduce the height and size of the optical module.

[0003] However, in related technologies, in order to ensure that the telephoto imaging quality meets the usage requirements, the size of the optical module is often difficult to further reduce. The optical module still needs to occupy a large space, making it impossible to achieve the miniaturization and portability of the camera, resulting in a poor user experience. Summary of the Invention

[0004] To overcome the problems existing in related technologies, this disclosure provides an optical module, including:

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

[0006] The second lens group is located at the image plane end;

[0007] A prism, wherein the first lens group and the second lens group are disposed on the same side of the prism;

[0008] The light rays at the object plane end are incident on the prism through the first lens group, and after multiple reflections in the prism, they enter the second lens group, and after passing through the second lens group, they are emitted to the image plane end to form an image.

[0009] In one possible implementation, the first lens group is configured to move relative to the prism along the optical axis of the first lens group; and / or,

[0010] The second lens group is configured to move relative to the prism along the optical axis of the second lens group.

[0011] In one possible implementation, the first lens group includes at least two lenses, and the second lens group includes at least two lenses;

[0012] The ratio of the first combined focal length of at least two lenses in the first lens group to the actual focal length of the optical module ranges from 0.8 to 1; and / or,

[0013] The ratio of the second combined focal length of at least two lenses in the second lens group to the actual focal length of the optical module ranges from -1 to -0.8.

[0014] In one possible implementation, the ratio of the total optical length of the first lens group to the actual focal length ranges from 0.22 to 0.3; and / or,

[0015] The ratio of the total optical length of the second lens group to the actual focal length ranges from 0.24 to 0.31.

[0016] In one possible implementation, the combined optical power of the first lens group is positive, and the combined optical power of the second lens group is negative.

[0017] In one possible implementation, along the direction of light propagation in the optical module, the first lens group includes a first lens, a second lens, and a third lens arranged in sequence, and the second lens group includes a fourth lens, a fifth lens, and a sixth lens arranged in sequence.

[0018] The first and fifth lenses have positive optical power, while the second, third, fourth, and sixth lenses have negative optical power.

[0019] In one possible implementation, the ratio of the focal length of the first lens to the actual focal length ranges from 0.3 to 0.55; and / or,

[0020] The ratio of the focal length of the second lens to the actual focal length ranges from -1.2 to -0.8; and / or,

[0021] The ratio of the focal length of the third lens to the actual focal length ranges from -25 to -15; and / or,

[0022] The ratio of the focal length of the fourth lens to the actual focal length ranges from -0.9 to -0.65; and / or,

[0023] The ratio of the focal length of the fifth lens to the actual focal length ranges from 0.65 to 0.78; and / or,

[0024] The ratio of the focal length of the sixth lens to the actual focal length ranges from -0.95 to -0.8.

[0025] In one possible implementation, the first lens includes a biconvex lens, the second lens includes a biconcave lens, and the third lens includes a meniscus lens, with the concave side of the third lens facing the object surface end.

[0026] And / or,

[0027] The fourth lens includes a meniscus lens, with the concave side of the fourth lens facing the image plane end; the fifth lens includes a biconvex lens; and the sixth lens includes a meniscus lens, with the concave side of the sixth lens facing the object plane end.

[0028] In one possible implementation, the light-incident surface of the first lens is a first surface, the light-exit surface of the first lens is a second surface, and the ratio of the sum of the radii of curvature of the first surface and the radii of curvature of the second surface to the difference between the radii of curvature of the first surface and the radii of curvature of the second surface is in the range of -0.35 to -0.28.

[0029] And / or,

[0030] The light-incident surface of the sixth lens is the third surface, and the light-exit surface of the sixth lens is the fourth surface. The ratio of the sum of the radii of curvature of the third surface and the radii of curvature of the fourth surface to the difference between the radii of curvature of the third surface and the radii of curvature of the fourth surface is in the range of 0.08 to 0.16.

[0031] In one possible implementation, the aperture coefficient of the optical module ranges from 2.0 to 2.8; and / or,

[0032] The optical module further includes an aperture stop, which is disposed on the side of the first lens group facing the object surface.

[0033] In one possible implementation, the optical module further includes:

[0034] An optical sensor is disposed at the image plane end;

[0035] A filter is disposed between the second lens group and the optical sensor.

[0036] In one possible implementation, along the optical axis of the first lens group, the distance from the end of the first lens group away from the prism to the prism is a first distance, the distance from the prism to the optical sensor is a second distance, and the distance between the optical axis of the first lens group and the optical axis of the second lens group is a third distance.

[0037] The ratio of the second distance to the first distance is in the range of 0.9 to 1.1, and the ratio of the second distance to the third distance is in the range of 0.45 to 0.55.

[0038] In one possible implementation, the prism has an isosceles trapezoidal shape on a preset cross section, and the preset cross section is parallel to the plane containing the optical axes of the first lens group and the second lens group.

[0039] The isosceles trapezoid includes a first base and a second base, the first base being longer than the second base. The first lens group and the second lens group are disposed on the side of the first base located outside the isosceles trapezoid. Reflective films are disposed on the side of the two sides of the isosceles trapezoid located inside the isosceles trapezoid. Light is reflected three times on the side of the first base located inside the isosceles trapezoid and on the side of the two sides located inside the isosceles trapezoid before exiting from the first base.

[0040] According to a second aspect of this disclosure, a camera is provided, including a driving component and an optical module as described in the first aspect of this disclosure, wherein the driving component is connected to a first lens group and a second lens group of the optical module, respectively, for driving the first lens group and / or the second lens group to move relative to the prism along their optical axis direction.

[0041] 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.

[0042] The beneficial effects of this disclosure are as follows: This disclosure sets up a first lens group and a second lens group, and uses a prism to reflect and refract the light path multiple times, making the size of the optical module smaller, so as to take into account the design requirements of imaging quality and miniaturization, and improve the user experience.

[0043] 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

[0044] 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.

[0045] Figure 1 This is a schematic cross-sectional view of an optical module according to an exemplary embodiment.

[0046] Figure 2 This is a schematic diagram illustrating the propagation direction of light in an optical module according to an exemplary embodiment.

[0047] Figure 3 This is an optical distortion curve of the optical module according to an embodiment of the present disclosure.

[0048] Figure 4 This is a graph showing the optical transfer function of the optical module of this embodiment under different field of view angles. Detailed Implementation

[0049] 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.

[0050] As technology continues to advance, users' demands for electronic devices are becoming increasingly diverse. Therefore, to improve the user experience, electronic device cameras need to balance miniaturization with high image quality. In related technologies, cameras typically use right-angle prisms to fold the light path 90°, reducing the height and size of the optical module. However, to ensure that telephoto image quality meets usage requirements, the size of the optical module is often difficult to further reduce. The optical module still occupies a significant amount of space, hindering the miniaturization and portability of the camera, resulting in a poor user experience.

[0051] To address the aforementioned technical issues, this disclosure proposes an optical module, a camera, and an electronic device. The optical module of this disclosure is configured with a first lens group and a second lens group, and uses a prism to reflect and refract the light path multiple times, making the size of the optical module smaller, thus balancing the design requirements of image quality and miniaturization, and improving the user experience.

[0052] According to an exemplary embodiment, such as Figures 1-2 As shown, this disclosure provides an optical module applied in a camera to achieve optical zoom and imaging. The optical module includes a first lens group 10, a second lens group 20, and a prism 30. The first lens group 10 is disposed at the object plane end 41, and the second lens group 20 is disposed at the image plane end 42. The first lens group 10 and the second lens group 20 are disposed on the same side of the prism 30. For example, as shown... Figure 1 As shown, both the first lens group 10 and the second lens group 20 are positioned above the prism 30, which is located between the optical paths of the first lens group 10 and the second lens group 20. The object plane end 41 is the end of the optical module closest to the object being photographed (not shown in the figure), i.e. Figures 1-2 As shown in the upper right corner, the image plane end 42 refers to the end of the optical module closest to the imaging area, that is... Figures 1-2 As shown on the upper left.

[0053] The light rays from the object plane end 41 are incident on the prism 30 through the first lens group 10, and after multiple reflections in the prism, they enter the second lens group 20, and after passing through the second lens group 20, they are emitted to the image plane end 42 to form an image. By reflecting the light rays from the object plane end 41 multiple times, the light path is folded multiple times, thereby increasing the equivalent length of the light path in a small space and improving the image quality.

[0054] In this embodiment, the optical path is folded multiple times by the prism 30, so that the size of the optical module can be smaller while meeting the imaging quality requirements, reducing the space occupied by the optical module, which is conducive to the miniaturization of the optical module and improving the user experience.

[0055] In some embodiments, the first lens group 10 is configured to move relative to the prism 30 along the optical axis of the first lens group 10; and / or, the second lens group 20 is configured to move relative to the prism 30 along the optical axis of the second lens group 20. By configuring the first lens group 10 and / or the second lens group 20 to move relative to the prism 30 along their own optical axis, internal focusing (i.e., the lens length remains constant during focusing, and focusing is achieved by the movement of internal lens groups) can be realized to adjust the focal length of the optical module.

[0056] In one example, the first lens group 10 is fixed in position relative to the prism 30, and the second lens group 20 is configured to move relative to the prism 30 along the optical axis of the second lens group 20; in another example, the second lens group 20 is fixed in position relative to the prism 30, and the first lens group 10 is configured to move relative to the prism 30 along the optical axis of the first lens group 10; in yet another example, the first lens group 10 is configured to move relative to the prism 30 along the optical axis of the first lens group 10, and the second lens group 20 is configured to move relative to the prism 30 along the optical axis of the second lens group 20.

[0057] When only one of the first lens group 10 or the second lens group 20 is configured to move relative to the prism 30, while achieving focal length adjustment, the driving force required to drive the lens group can be reduced compared to simultaneously driving the first lens group 10 and the second lens group 20. This reduces the driving weight of the motor and facilitates the lightweighting of the driving components. When both the first lens group 10 and the second lens group 20 are configured to move relative to the prism 30, the adjustable range and flexibility of the focal length can be improved, meeting more refined imaging requirements.

[0058] In some embodiments, the optical axis direction of the first lens group 10 is parallel to the optical axis direction of the second lens group 20, so as to control the optical path and imaging position by designing the shape of the prism 30, and to facilitate production and assembly.

[0059] In some embodiments, the first lens group 10 and the second lens group 20 each include at least two lenses. The number of lenses in the first lens group 10 and the second lens group 20 may be the same or different. Those skilled in the art can choose according to actual production needs and optical path design requirements; this disclosure does not impose excessive limitations in this regard.

[0060] In some embodiments, the ratio of the first combined focal length of at least two lenses in the first lens group 10 to the actual focal length F of the optical module ranges from 0.8 to 1; and / or, the ratio of the second combined focal length of at least two lenses in the second lens group 20 to the actual focal length F of the optical module ranges from -1 to -0.8. The actual focal length F of the optical module refers to the optical parameter marked on the lens, representing the distance from the center of the lens to the imaging plane. In this embodiment, the actual focal length F is 21.6 mm, and the equivalent focal length is 115 mm. It is understood that the actual focal length F can also be other values. When the actual focal length F changes, the equivalent focal length, the combined focal length of the first lens group 10, and the combined focal length of the second lens group 20 will all change accordingly. Those skilled in the art can set these values ​​according to actual needs, and this embodiment does not impose any special limitations on this.

[0061] In some embodiments, the ratio of the total optical length TTL1 of the first lens group 10 to the actual focal length F ranges from 0.22 to 0.3; and / or, the ratio of the total optical length TTL2 of the second lens group 20 to the actual focal length F ranges from 0.24 to 0.31. That is, 0.22 < TTL1 / F < 0.3; and / or, 0.24 < TTL2 / F < 0.31. Here, the total optical length refers to the distance from the surface of the first lens in the lens group to the imaging plane. The total optical length TTL1 of the first lens group 10 is the distance from the surface of the first lens in the first lens group 10 along the optical propagation direction to the imaging plane, and the total optical length TTL2 of the second lens group 20 is the distance from the surface of the first lens in the second lens group 20 along the optical propagation direction to the imaging plane.

[0062] In some embodiments, the combined optical power of the first lens group 10 is positive, and the combined optical power of the second lens group 20 is negative. The first lens group 10 as a whole acts as a positive lens, used to focus the light emitted from the object end 41 into the prism 30, and the second lens group 20 as a whole acts as a negative lens, used to disperse the light emitted after multiple reflections by the prism 30 for imaging. Specifically, the first lens in the first lens group 10 along the direction of light propagation in the optical module has a positive optical power, and the other lenses in the first lens group 10 can have either positive or negative optical power; the first lens in the second lens group 20 along the direction of light propagation in the optical module has a negative optical power, and the other lenses in the second lens group 20 can also have either positive or negative optical power. This disclosure does not impose excessive limitations on these aspects, and those skilled in the art can configure them according to actual needs.

[0063] In some embodiments, the first lens group 10 and the second lens group 20 each include three lenses.

[0064] Among them, such as Figures 1-2 As shown, the first lens group 10 includes a first lens 11, a second lens 12, and a third lens 13 arranged sequentially along the direction of light propagation in the optical module, that is, the first lens 11, the second lens 12, and the third lens 13 are arranged along the direction of light propagation in the optical module. Figure 1 The arrangement is shown from top to bottom. The second lens group 20 includes a fourth lens 21, a fifth lens 22, and a sixth lens 26 arranged sequentially along the direction of light propagation in the optical module, that is, the fourth lens 21, the fifth lens 22, and the sixth lens 26. Figure 1 The arrangement shown is from bottom to top.

[0065] In one example, the focal power of the first lens 11 and the fifth lens 22 is positive, while the focal power of the second lens 12, the third lens 13, the fourth lens 21, and the sixth lens 23 is negative. 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.

[0066] In some embodiments, each lens in the first lens group 10 and the second lens group 20 can be made of glass or plastic. All lenses may be made of the same material, or some lenses may be made of glass and some of plastic. Of course, it is understood that the lenses can also be made of other transparent materials such as resin and quartz. Those skilled in the art can choose according to actual needs, and this disclosure does not impose excessive limitations in this regard.

[0067] In one example, the first lens 11 is made of a high Abbe number material, and the second lens 12 is made of a high refractive index material. Other lenses can be set to high Abbe number or high refractive index materials according to actual needs. Refractive index and Abbe number are both 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 chromatic dispersion in a lens, directly affecting its sharpness. Generally speaking, the higher the refractive index of the medium, the more severe the dispersion, and the lower the Abbe number; conversely, the lower the refractive index, the less severe the dispersion, and the higher the Abbe number.

[0068] In some embodiments, the individual lenses in the first lens group 10 and the second lens group 20 may be configured to have the same or different focal lengths.

[0069] In one example, the ratio of the focal length f1 of the first lens 11 to the actual focal length F ranges from 0.3 to 0.55, that is, 0.3 < f1 / F < 0.55.

[0070] In one example, the ratio of the focal length f2 of the second lens 12 to the actual focal length F ranges from -1.2 to -0.8, that is, -1.2 < f2 / F < -0.8.

[0071] In one example, the ratio of the focal length f3 of the third lens 13 to the actual focal length F ranges from -25 to -15, that is, -25 < f3 / F < -15.

[0072] In one example, the ratio of the focal length f4 of the fourth lens 21 to the actual focal length F ranges from -0.9 to -0.65, that is, -0.9 < f4 / F < -0.65.

[0073] In one example, the ratio of the focal length f5 of the fifth lens 22 to the actual focal length F ranges from 0.65 to 0.78, that is, 0.65 < f5 / F < 0.78.

[0074] In one example, the ratio of the focal length f6 of the sixth lens 23 to the actual focal length F ranges from -0.95 to -0.8, that is, -0.95 < f6 / F < -0.8.

[0075] In some embodiments, the individual lenses in the first lens group 10 may have different shapes.

[0076] In one example, such as Figures 1-2 As shown, the first lens 11 includes a biconvex lens, the second lens 12 includes a biconcave lens, and the third lens 13 includes a meniscus lens, with the concave side of the third lens 13 facing the object surface end 41.

[0077] In some embodiments, the individual lenses in the second lens group 20 may have different shapes.

[0078] In one example, such as Figures 1-2 As shown, the fourth lens 21 includes a meniscus lens, with the concave side of the fourth lens 21 facing the image plane end 42; the fifth lens 22 includes a biconvex lens; and the sixth lens 23 includes a meniscus lens, with the concave side of the sixth lens 23 facing the object plane end 41.

[0079] In one example, the light-incident surface of the first lens 11 is the first surface, and the light-exit surface of the first lens 11 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 ranges from -0.35 to -0.28. That is, -0.35 < (R11 + R12) / (R11 - R12) < -0.28.

[0080] In one example, the light-incident surface of the sixth lens 23 is the third surface, and the light-exit surface of the sixth lens 23 is the fourth surface. The ratio of the sum of the radii of curvature R61 of the third surface and R62 of the fourth surface to the difference between the radii of curvature R61 of the third surface and R62 of the fourth surface ranges from 0.08 to 0.16. That is, 0.08 < (R61 + R62) / (R61 - R62) < 0.16.

[0081] 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.

[0082] Table 1. Surface-related parameters of each lens in the optical module.

[0083]

[0084] In this context, 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, and the surface on which the light exits each lens, respectively. Taking the first lens 11 as an example, the light-incident side (i.e., the first surface mentioned above) of the first lens 11 is a curved surface with a radius of curvature of 8.26 mm and a thickness of 2.42 mm. The light-exit side (i.e., the second surface mentioned above) of the first lens 11 is also a curved surface with a radius of curvature of -15.65 and a thickness of 0.55 mm. The relevant parameters of other lenses can also be found in Table 1 above, and will not be elaborated further in this embodiment.

[0085] Of course, it is understood that the number of lenses in the optical module, the optical power, focal length, shape and other parameters of each lens, as well as the material of each lens, can all be set by those skilled in the art according to actual needs, and the embodiments disclosed herein do not impose too many restrictions on this.

[0086] In some embodiments, the aperture coefficient of the optical module ranges from 2.0 to 2.8. The aperture coefficient refers to the reciprocal of the relative aperture, that is, the ratio of the lens focal length to the entrance pupil diameter. A larger aperture coefficient means that more light can pass through the lens and enter the camera, increasing exposure; a smaller aperture coefficient allows less light to pass through, thus reducing exposure. This disclosure does not impose excessive limitations on the specific value of the aperture coefficient of the optical module; those skilled in the art can set it according to actual needs.

[0087] In some embodiments, the optical module further includes an aperture 53, a filter 51, and an optical sensor 52. For example... Figures 1-2 As shown, the aperture stop 53 is disposed on the side of the first lens group 10 facing the object plane end 41. An aperture stop is a physical entity in an optical system that limits the beam of light; it can be the edge of a lens, a frame, or a specially designed perforated screen. Its function can be to limit the beam of light or to limit the field of view (imaging range). The optical sensor 52 is disposed at the image plane end 42, and the filter 51 is disposed between the second lens group 20 and the optical sensor 52. Light rays from the object plane end 41 pass through the aperture stop 53 and enter the first lens group 10. After passing through the first lens group 10, the light rays enter the prism 30 and undergo multiple reflections within the prism 30 before exiting to the second lens group 20. After passing through the filter 51, the light rays reach the optical sensor 52, which is used for imaging.

[0088] In some embodiments, along the optical axis of the first lens group 10, the distance from the end of the first lens group 10 away from the prism 30 to the prism 30 is a first distance D1, the distance from the prism 30 to the optical sensor 52 is a second distance D2, and the distance between the optical axes of the first lens group and the second lens group is a third distance D3. The ratio of the second distance D2 to the first distance D1 ranges from 0.9 to 1.1, and the ratio of the second distance D2 to the third distance D3 ranges from 0.45 to 0.55, that is, 0.9 < D2 / D1 < 1.1, 0.45 < D2 / D3 < 0.55.

[0089] In some embodiments, the prism 30 has an isosceles trapezoidal shape on a preset cross-section, and the preset cross-section is parallel to the plane containing the optical axes of the first lens group and the second lens group. For example... Figures 1-2 As shown, the isosceles trapezoid includes the first base (i.e., Figures 1-2 The bottom edge shown is located at the top) and the second bottom edge (that is... Figures 1-2 The first base (shown as the lower side) is longer than the second base. A first lens group 10 and a second lens group 20 are positioned on the outer side of the first base of the isosceles trapezoid. Reflective films (not shown) are disposed on the inner sides of the two sides of the isosceles trapezoid. Light is reflected three times: once on the inner side of the first base and once on the inner sides of the two sides, before exiting from the first base. Specular reflection occurs on the reflective films on the two sides of the isosceles trapezoid, and total internal reflection occurs on the inner side of the first base. Total internal reflection is an optical phenomenon where, when light travels from a medium with a higher refractive index to a medium with a lower refractive index, if the angle of incidence is greater than a critical angle θc (the light ray is away from the normal), the refracted light will disappear, and all incident light will be reflected and will not enter the lower refractive index medium. To ensure total internal reflection, the angle of incidence of light incident on the first base can be adjusted by adjusting the angle between the two sides and the first base, thus ensuring reliable light transmission.

[0090] like Figure 2 As shown, the light ray at the object plane end 41 is the first light ray S1. After the first light ray S1 enters the prism 30, it undergoes a first reflection to obtain the second light ray S2. After the second light ray S2 undergoes a second reflection to obtain the third light ray S3. After the third light ray S3 undergoes a third reflection to obtain the fourth light ray S4. The fourth light ray S4 exits the prism 30 and, after passing through the second lens group 20, reaches the image plane end 42 to form an image. It is understood that this embodiment of the present disclosure uses the light ray at the object plane end 41 undergoing three reflections, that is, the light path undergoing three folds, as an example for explanation. In the actual design and production process, those skilled in the art can also adjust the shape of the prism 30 according to actual needs to achieve other numbers of reflections, such as two or four. This embodiment of the present disclosure does not impose too many limitations on this, and those skilled in the art can set it according to actual needs.

[0091] The following will combine Figures 3-4 The technical effects of the optical module in the embodiments of this disclosure will be explained.

[0092] like Figure 3 As shown, Figure 3 This is an optical distortion curve of the optical module according to an embodiment of the present disclosure. Figure 3 The horizontal axis represents optical distortion in %, and the vertical axis represents image height in mm. Curve a represents the optical distortion of the optical module of this embodiment at different image heights. According to Figure 3 As can be seen from curve a, the optical distortion can be kept within 2.5% under different image heights, which meets the optical distortion requirements and has good imaging quality.

[0093] like Figure 4 As shown, Figure 4 This is a graph showing the optical transfer function of the optical module of this embodiment under different field of view angles. Figure 4 In the graph, the horizontal axis represents frequency, and the vertical axis represents the optical transfer function. Curve b represents the theoretical limit of the optical transfer function. Curves c and d represent the meridional modulation transfer function and sagittal modulation transfer function at a 0° field of view, respectively. Curves e and f represent the meridional modulation transfer function and sagittal modulation transfer function at a 0.7° field of view, respectively. Curves g and h represent the meridional modulation transfer function and sagittal modulation transfer function at a 1.0° field of view, respectively. The closer the curve is to curve b, the better the image quality. Figure 4 As can be seen from the data, under different fields of view, the optical transfer function curves of the optical module of this disclosure embodiment are all quite close to curve b, which proves that the optical module of this disclosure embodiment has high imaging quality.

[0094] According to an exemplary embodiment, such as Figures 1-2 As shown, this disclosure provides a camera that can be used in electronic devices with shooting functions, such as cameras, mobile terminals, and tablet computers. The camera includes a driving component (not shown in the figure) and an optical module as described in the above embodiments.

[0095] The optical module includes a first lens group 10, a second lens group 20, and a prism 30. The first lens group 10 is located at the object plane end 41, and the second lens group 20 is located at the image plane end 42. The first lens group 10 and the second lens group 20 are positioned on the same side of the prism 30. Light rays from the object plane end 41 are incident on the prism 30 via the first lens group 10, undergo multiple reflections within the prism, enter the second lens group 20, and then exit at the image plane end 42 to form an image. By performing multiple reflections on the light rays from the object plane end 41, multiple folds in the optical path are achieved, thereby increasing the equivalent length of the optical path within a smaller space and improving image quality. A driving component is connected to the first lens group 10 and the second lens group 20 of the optical module, respectively, to drive the first lens group 10 and / or the second lens group 20 to move relative to the prism along their optical axis, thereby adjusting the focal length of the optical module.

[0096] According to an exemplary embodiment, such as Figures 1-2 As shown, this disclosure provides an electronic device, including an optical module or camera as described in the above embodiments. The electronic device may be, for example, a camera, a mobile terminal, a tablet computer, or other electronic devices with shooting capabilities.

[0097] The camera includes a driving component and an optical module. The driving component is connected to the first lens group 10 and the second lens group 20 of the optical module, respectively, and is used to drive the first lens group 10 and / or the second lens group 20 to move relative to the prism along their optical axis. The driving component can, for example, drive the first lens group 10 and the second lens group 20 by clicking a driving gear. The optical module includes the first lens group 10, the second lens group 20 and the prism 30. The first lens group 10 is disposed at the object plane end 41, and the second lens group 20 is disposed at the image plane end 42. The first lens group 10 and the second lens group 20 are disposed on the same side of the prism 30. Light from the object plane end 41 is incident on the prism 30 through the first lens group 10, and after multiple reflections in the prism, it enters the second lens group 20, and then exits at the image plane end 42 to form an image. The first lens group 10 and the second lens group 20 are disposed on the same side of the prism 30, and their optical axes are parallel to each other. This arrangement, compared to the prior art's method of coaxially arranging the two lens groups, effectively reduces the size of the lens, thus facilitating the overall structural layout of the electronic device. Simultaneously, multiple reflections are formed within the prism 30, ensuring effective imaging.

[0098] 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 disclosure 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.

[0099] 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 in that, include: The first lens group is located at the object surface end; The second lens group is located at the image plane end; A prism, wherein the first lens group and the second lens group are disposed on the same side of the prism; The light rays at the object plane end are incident on the prism through the first lens group, and after multiple reflections in the prism, they enter the second lens group, and after passing through the second lens group, they are emitted to the image plane end to form an image. The first lens group is configured to move relative to the prism along the optical axis of the first lens group; And / or, The second lens group is configured to move relative to the prism along the optical axis of the second lens group.

2. The optical module according to claim 1, characterized in that, The first lens group includes at least two lenses, and the second lens group includes at least two lenses; The ratio of the first combined focal length of at least two lenses in the first lens group to the actual focal length of the optical module ranges from 0.8 to 1; and / or, The ratio of the second combined focal length of at least two lenses in the second lens group to the actual focal length of the optical module ranges from -1 to -0.

8.

3. The optical module according to claim 2, characterized in that, The ratio of the total optical length of the first lens group to the actual focal length ranges from 0.22 to 0.3; and / or, The ratio of the total optical length of the second lens group to the actual focal length ranges from 0.24 to 0.

31.

4. The optical module according to claim 2, characterized in that, The combined optical power of the first lens group is positive, and the combined optical power of the second lens group is negative.

5. The optical module according to claim 4, characterized in that, Along the direction of light propagation in the optical module, the first lens group includes a first lens, a second lens, and a third lens arranged in sequence, and the second lens group includes a fourth lens, a fifth lens, and a sixth lens arranged in sequence. The first and fifth lenses have positive optical power, while the second, third, fourth, and sixth lenses have negative optical power.

6. The optical module according to claim 5, characterized in that, The ratio of the focal length of the first lens to the actual focal length ranges from 0.3 to 0.55; and / or, The ratio of the focal length of the second lens to the actual focal length ranges from -1.2 to -0.8; and / or, The ratio of the focal length of the third lens to the actual focal length is in the range of -25 to -15; and / or, The ratio of the focal length of the fourth lens to the actual focal length ranges from -0.9 to -0.65; and / or, The ratio of the focal length of the fifth lens to the actual focal length ranges from 0.65 to 0.78; and / or, The ratio of the focal length of the sixth lens to the actual focal length ranges from -0.95 to -0.

8.

7. The optical module according to claim 5, characterized in that, The first lens includes a biconvex lens, the second lens includes a biconcave lens, and the third lens includes a meniscus lens, with the concave side of the third lens facing the object surface end; And / or, The fourth lens includes a meniscus lens, with the concave side of the fourth lens facing the image plane end; the fifth lens includes a biconvex lens; and the sixth lens includes a meniscus lens, with the concave side of the sixth lens facing the object plane end.

8. The optical module according to claim 5, characterized in that, The light-incident surface of the first lens is the first surface, and the light-exit surface of the first lens is the second surface. The ratio of the sum of the radii of curvature of the first surface and the radii of curvature of the second surface to the difference between the radii of curvature of the first surface and the radii of curvature of the second surface is in the range of -0.35 to -0.

28. And / or, The light-incident surface of the sixth lens is the third surface, and the light-exit surface of the sixth lens is the fourth surface. The ratio of the sum of the radii of curvature of the third surface and the radii of curvature of the fourth surface to the difference between the radii of curvature of the third surface and the radii of curvature of the fourth surface is in the range of 0.08 to 0.

16.

9. The optical module according to any one of claims 1 to 8, characterized in that, The aperture coefficient of the optical module ranges from 2.0 to 2.8; and / or, The optical module further includes an aperture stop, which is disposed on the side of the first lens group facing the object surface.

10. The optical module according to any one of claims 1 to 8, characterized in that, The optical module also includes: An optical sensor is disposed at the image plane end; A filter is disposed between the second lens group and the optical sensor.

11. The optical module according to claim 10, characterized in that, Along the optical axis of the first lens group, the distance from the end of the first lens group away from the prism to the prism is the first distance, the distance from the prism to the optical sensor is the second distance, and the distance between the optical axis of the first lens group and the optical axis of the second lens group is the third distance. The ratio of the second distance to the first distance is in the range of 0.9 to 1.1, and the ratio of the second distance to the third distance is in the range of 0.45 to 0.

55.

12. The optical module according to any one of claims 1 to 8, characterized in that, The prism has an isosceles trapezoidal shape on a preset cross section, and the preset cross section is parallel to the plane containing the optical axes of the first lens group and the second lens group. The isosceles trapezoid includes a first base and a second base, the first base being longer than the second base. The first lens group and the second lens group are disposed on the side of the first base located outside the isosceles trapezoid. Reflective films are disposed on the side of the two sides of the isosceles trapezoid located inside the isosceles trapezoid. Light is reflected three times on the side of the first base located inside the isosceles trapezoid and on the side of the two sides located inside the isosceles trapezoid before exiting from the first base.

13. A camera, characterized in that, The device includes a driving component and an optical module as described in any one of claims 1 to 12, wherein the driving component is connected to a first lens group and a second lens group of the optical module, respectively, for driving the first lens group and / or the second lens group to move relative to the prism along their optical axis.

14. An electronic device, characterized in that, Includes the optical module as described in any one of claims 1 to 12 or the camera as described in claim 13.

Images