Optical system and camera module

Abstract

The optical system comprises a first optical assembly, a first reflecting element and a second optical assembly, the first optical assembly is located on the light-incident side of the first reflecting element, the second optical assembly is located on the light-emitting side of the first reflecting element, the first optical assembly comprises at least two front-group lenses, the at least two front-group lenses are sequentially arranged along a first optical axis, the second optical assembly comprises at least one rear-group lens, the at least one rear-group lens is sequentially arranged along a second optical axis, the first optical assembly is used for converging light rays incident along the first optical axis, and the first reflecting element is used for turning the converged light rays to emit along the second optical axis. The optical system can be beneficial to realize miniaturization of electronic equipment and improve zoom ratio.

Description

Technical Field

[0001] The present disclosure relates to the field of camera modules, and particularly to an optical system and a camera module. Background Art

[0002] Currently, users have increasingly higher requirements for the shooting quality and zoom function of shooting devices such as mobile phones. Generally, short / medium / long focal length lenses are selected for a relay or hybrid architecture to achieve a high magnification zoom function. For a long focal length lens, due to the excessive total track length (TTL), the height of the traditional upright architecture can no longer meet the thickness requirements of general mobile phone devices. Therefore, most long focal length lens modules in the market incorporate reflectors or prisms and use a periscope architecture to meet the thin and light requirements of electronic devices. Summary of the Invention

[0003] An object of the present disclosure is to provide an optical system, which is conducive to obtaining a camera module with a large aperture, low shoulder height, high magnification, and long focal length.

[0004] To achieve the above object, the present disclosure provides an optical system, including a first optical component, a first reflecting element, and a second optical component. The first optical component is located on the incident light side of the first reflecting element, and the second optical component is located on the outgoing light side of the first reflecting element. The first optical component includes at least two front lens groups, and the at least two front lens groups are arranged in sequence along a first optical axis. The second optical component includes at least one rear lens group, and the at least one rear lens group is arranged in sequence along a second optical axis. The first optical component is configured to converge the light incident along the first optical axis, and the first reflecting element is configured to deflect the converged light to be emitted along the second optical axis.

[0005] In some embodiments, the diameter SD1 of the light passing hole of the incident light of the front lens group that the light first passes through among the at least two front lens groups and the diameter SD2 of the light passing hole of the outgoing light of the last rear lens group among the at least one rear lens group satisfy: 0.2 < (SD1 - SD2) / SD1 < 0.5.

[0006] In some embodiments, the at least two lenses include at least one fixed lens and at least one movable lens. The at least one fixed lens is farther from the first reflecting element than the at least one movable lens. The at least one fixed lens serves as a first group, and the at least one movable lens, the first reflecting element, and the second optical component serve as a second group. The optical power P1 of the first group and the optical power P2 of the second group satisfy: -3 < P1 / P2 < -1, where P1 > 0.03.

[0007] In some embodiments, the radius of curvature R1 of the rear surface of the last lens in the first group along the light propagation direction and the radius of curvature R2 of the front surface of the first lens in the second group along the light propagation direction satisfy: 1 < R1 / R2 < 6.

[0008] In some embodiments, the optical system further includes a lens module and a pentagonal prism. The pentagonal prism includes a first surface, a second surface, a third surface, a fourth surface, and a fifth surface connected in sequence. The first surface faces the lens module, and the second surface faces a photosensitive module for receiving the optical image provided by the optical system. The light of the lens module first enters the pentagonal prism through the first surface, then is incident on the third surface, and after being reflected by the third surface, is incident on the fifth surface. After the light is reflected by the fifth surface, it passes through the second surface and enters the photosensitive module. The first surface is parallel to the first optical axis, the second surface is parallel to the second optical axis, and the second surface is perpendicular to the third optical axis. The pentagonal prism reflects the outgoing light of the lens module at least twice and then emits it along the third optical axis. The equivalent focal length EFL of the optical system, the half-height image Himg of the chip in the photosensitive module, the first distance TTL1 between the first reference surface and the first surface, and the second distance TTL between the first surface and the vertex satisfy: 3.5 < EFL·Himg / (TTL1 + TTL2) < 4.5. The first reference surface is parallel to the first surface, and the first reference surface is the surface where the light farthest from the first surface in the second optical axis direction is located. The second reference surface is a plane parallel to the first surface and passing through the vertex of the third surface farthest from the first surface in the second optical axis direction.

[0009] In some embodiments, at least one lens in the first optical component has a trimmed edge structure. The total height SH of the optical system and the entrance pupil diameter EPD in the trimmed edge direction of the optical system satisfy: 1.15 < SH / EPD < 1.25. The total height SH is the maximum height of the optical system in the first optical axis direction, and the trimmed edge direction is parallel to the direction of the trimmed edge in the trimmed edge structure.

[0010] In some embodiments, the optical system further includes a lens module. The optical length AFOL of the lens module and the number of lenses AFLN of the lens module satisfy: 1.3 < AFOL / AFLN < 1.8.

[0011] In some embodiments, the optical system further includes a lens module, wherein the angle AOF between the edge rays of the meridional plane and the optical axis in a plurality of fields of view of the lens module and the effective focal length AFEFL of the lens module satisfy: 0.1 < (max{|AOF|} - min{|AOF|}) / AFEFL < 0.3, where |AOF| is the absolute value of the angle AOF.

[0012] In some embodiments, the first optical component has positive optical power and the second optical component has negative optical power.

[0013] This disclosure also provides a camera module, including an optical system and a photosensitive module provided in any embodiment of this disclosure, wherein the photosensitive module is disposed on the light-emitting side of the optical system and configured to image the light emitted from the optical system. Attached Figure Description

[0014] Figure 1 A schematic diagram of an electronic device including a camera module provided in at least one embodiment of the present disclosure is shown;

[0015] Figure 2 A schematic diagram of a camera module provided in at least one embodiment of the present disclosure is shown; Figure 3A A schematic diagram of the structure of an optical system provided in at least one embodiment of the present disclosure is shown; Figure 3B A schematic diagram of a first optical component provided in at least one embodiment of the present disclosure is shown; Figure 4 A schematic diagram of another optical system provided by at least one embodiment of the present disclosure is shown; Figure 5 A schematic diagram of another optical system provided by at least one embodiment of the present disclosure is shown; Figure 6A and Figure 6B A schematic diagram of the edge rays of the meridional plane in a field of view is shown; Figure 7 This is a schematic diagram showing the angle α1 between the second and third reflecting surfaces and the angle β1 between the imaging surface of the photosensitive module and the second optical axis O2. Figure 8 This is a schematic diagram of a first embodiment of the second reflection module of this disclosure; Figure 9 A schematic diagram of the structure of another optical system provided in at least one embodiment of the present disclosure is shown; Figure 10 A top view of an embodiment of the lens of the first optical component of this disclosure; Figure 11This is a schematic diagram of a second embodiment of the second reflection module of this disclosure; Figure 12 This is a schematic diagram of a third embodiment of the second reflection module of this disclosure; Figure 13 This is a schematic diagram of a fourth embodiment of the second reflection module of this disclosure; Figure 14 This is a schematic diagram of the fifth embodiment of the second reflection module of this disclosure; Figure 15 This is a schematic diagram of Embodiment 1 of the first reflection module of this disclosure; Figure 16 This is a schematic diagram of Embodiment 2 of the first reflection module of this disclosure; Figure 17 This is a schematic diagram of Embodiment 3 of the first reflection module of this disclosure; Figure 18 A schematic diagram of another optical system provided by at least one embodiment of the present disclosure is shown; Figure 19A A structural diagram of an optical system according to a first embodiment of at least one embodiment of this disclosure is shown; Figure 19B The optical system distortion curve of the first embodiment is shown; Figure 19C The astigmatism curve of the optical system in the first embodiment is shown; Figure 19D The on-axis chromatic aberration curve of the optical system of the first embodiment is shown; Figure 20A A structural diagram of an optical system according to a second embodiment of at least one embodiment of this disclosure is shown; Figure 20B The optical system distortion curve of the second embodiment is shown; Figure 20C The astigmatism curve of the optical system according to the second embodiment is shown; Figure 20D The on-axis chromatic aberration curve of the optical system according to the second embodiment is shown; Figure 21A A structural diagram of an optical system according to a third embodiment of at least one embodiment of this disclosure is shown; Figure 21B The optical system distortion curve for the third embodiment is shown; Figure 21C The astigmatism curve of the optical system according to the third embodiment is shown; Figure 21D The on-axis chromatic aberration curve of the optical system according to the third embodiment is shown; Figure 22AA structural diagram of an optical system according to a fourth embodiment of at least one embodiment of this disclosure is shown; Figure 22B The optical system distortion curve for the fourth embodiment is shown; Figure 22C The astigmatism curve of the optical system according to the fourth embodiment is shown; Figure 22D The on-axis chromatic aberration curve of the optical system according to the fourth embodiment is shown; Figure 23A A structural diagram of an optical system according to a fifth embodiment of at least one embodiment of the present disclosure is shown; Figure 23B The optical system distortion curve of the fifth embodiment is shown; Figure 23C The astigmatism curve of the optical system according to the fifth embodiment is shown; Figure 23D The on-axis chromatic aberration curve of the optical system according to the fifth embodiment is shown; and Figure 24 A block diagram of a camera module provided in at least one embodiment of the present disclosure is shown. Detailed Implementation

[0016] The present disclosure will now be further described in conjunction with specific embodiments. It should be noted that, without conflict, the various embodiments or technical features described below can be arbitrarily combined to form new embodiments.

[0017] In the description of this disclosure, it should be noted that the terms such as "center", "lateral", "longitudinal", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", and "counterclockwise" indicate the orientation and positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this disclosure and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. They should not be construed as limiting the specific protection scope of this disclosure.

[0018] It should be noted that the terms "first," "second," etc., in the specification and claims of this disclosure are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence.

[0019] The terms “comprising” and “having”, and any variations thereof, in this disclosure and in the claims are intended to cover non-exclusive inclusion, such that a process, method, system, product, or apparatus that includes a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such process, method, product, or apparatus.

[0020] To facilitate understanding of the optical system and camera module provided in the embodiments of this disclosure, the relevant terms used in this disclosure are explained as follows: The optical axis is an axis that passes through the center of each lens.

[0021] The shoulder height (GH) of the optical system refers to the height of the lens module along the Y-axis after the first reflection module, such as... Figure 3A As shown.

[0022] The total height (SH) of an optical system refers to the height of the entire optical system along the Y-axis. Figure 3A As shown.

[0023] Image height (IH) is the diagonal length of the effective pixel area on the chip of photosensitive module 4.

[0024] The effective focal length of an optical system is the distance from the principal surface of the lens (usually the rear principal surface) to the focal point of the image.

[0025] Equivalent focal length converts the actual focal length of the lens on image sensors of different sizes into an equivalent focal length value with the same angle of view as a 135 film camera (full-frame, sensor size 36mm×24mm).

[0026] The entrance pupil diameter (EPD) is the effective aperture of an optical system, which directly determines the amount of light entering the system.

[0027] Aperture value (FNO) is a relative value derived from the effective focal length of an optical system divided by the entrance pupil diameter. A smaller aperture value allows more light to enter the camera within the same unit of time. A larger aperture value results in a shallower depth of field, blurring the background and creating an effect similar to a telephoto lens.

[0028] Positive optical power, also known as positive refractive power, indicates that a lens has a positive focal length, which can focus light rays.

[0029] Negative optical power, also known as negative refractive power, indicates that a lens has a negative focal length, which can diverge light.

[0030] Aberrations refer to the deviations between the image formed by an uncorrected optical system and the image formed by an ideal optical system. Aberrations include spherical aberration, coma, field curvature, astigmatism, distortion, and chromatic aberration.

[0031] Optical zoom refers to changing the focal length by physically moving lens elements, thus magnifying or reducing the size of the captured image. Optical zoom does not easily lose image quality because it alters the physical structure of the lens.

[0032] Focusing refers to adjusting the lens position to ensure that the subject is in sharp focus without changing the system's focal length.

[0033] With the lens as the boundary, the side where the object is located is called the object side, and the surface of the lens closest to the object side is called the object side surface.

[0034] The radius of curvature of a convex lens is the radius of the circle of curvature from the center of the lens to the point on the lens surface closest to the center. For a convex lens, its radius of curvature is usually a positive value.

[0035] The radius of curvature of a concave lens is the radius of the circle of curvature from the center of the lens to the point on the lens surface closest to the center. For concave lenses, the radius of curvature is usually negative.

[0036] The field of view (FOV) in optical instruments is the angle between the two edges of the lens, representing the maximum range through which the image of the target object can pass through the lens. The size of the FOV determines the field of view of the optical instrument; a larger FOV results in a wider field of view but a lower optical magnification.

[0037] With the increasing integration of mobile terminal devices, smartphones have evolved into all-around smart terminals integrating high-performance imaging systems, multimedia entertainment, and mobile office capabilities. Global smartphone users are creating images more frequently each day, and the demand for telephoto shooting is also growing, highlighting the urgent need for long-distance photography. At the same time, consumer electronics industrial design is moving towards extreme thinness and lightness; for example, the thickness of mainstream mobile phone models has broken through the 7.9mm technical threshold. This presents unprecedented challenges to camera module design: under the strict constraint of a body thickness (≤9mm), the camera module must simultaneously achieve: ultra-telephoto optical performance, sufficiently high space compression, and high reliability under various shooting environments.

[0038] This triple technical paradox of "high magnification, miniaturization, and strong stability" has become a key bottleneck restricting the development of mobile imaging. In order to break through the physical limits of mobile imaging, the industry has successively developed periscope modules and multi-fold prism systems. These solutions usually achieve optical zoom capabilities of 5X~8X equivalent focal length while maintaining the thickness of the mobile phone ≤9mm through precise optical path folding technology (typically a triple reflection trapezoidal prism architecture). However, when further extending the optical zoom to 10X and above, traditional solutions face three technical barriers: (1) In order to achieve an equivalent focal length of more than 200mm (optical zoom magnification of 8X and above), the diagonal size of the prism needs to be ≥15mm (formula derivation: D = 2·f·tan(a), where a represents half of the field of view and D represents the diagonal size of the prism), resulting in the width of a single telephoto module exceeding 20mm, which violates the structural design boundary of a full-screen mobile phone; (2) In order to overcome the size limitation to a certain extent, the optical path is compressed by folding the light through a multi-prism scheme to achieve telephoto performance. However, with each additional reflection, the ghost image risk increases by about 18% (calculated based on Fresnel reflection law). After 5 reflections, the stray light coefficient of the system is as high as 9.7%, far exceeding the industry's tolerance threshold of 3%; (3) The stacking of multi-prisms causes the assembly tolerance sensitivity to increase geometrically. The telephoto lens needs to take into account both image quality and zoom capability. Its lens quantity is generally 6~8 or even more. The resulting tolerance accumulation effect cannot be ignored.

[0039] This disclosure provides an optical system that facilitates miniaturization of electronic devices (e.g., mobile phones) and improves zoom magnification (e.g., extending optical zoom to 10× and above). The optical system includes a first optical component, a first reflective element, and a second optical component. The first optical component is located on the light-incident side of the first reflective element, and the second optical component is located on the light-outceasing side of the first reflective element. The first optical component includes at least two front lenses arranged sequentially along a first optical axis. The second optical component includes at least one rear lens arranged sequentially along a second optical axis. The first optical component is used to converge light rays incident along the first optical axis, and the first reflective element is used to deflect the converged light rays to exit along the second optical axis. The optical system provided by this disclosure achieves optical path deflection, i.e., reduces the size of the optical system through a periscope-like architecture, and increases the amount of light received by converging the light rays, thereby achieving a large aperture, low height, high magnification, and long focal length for the camera module.

[0040] The optical system and camera module provided in the embodiments of this disclosure are described below with reference to the accompanying drawings. The optical system and camera module provided in the embodiments of this disclosure can be applied to, but are not limited to, mobile phones, tablet computers, laptop computers, personal digital assistants (PDAs), cameras, personal computers, laptops, in-vehicle devices, wearable devices, augmented reality (AR) glasses, AR helmets, virtual reality (VR) glasses or VR helmets, or other electronic devices with photography and video recording functions.

[0041] Figure 1 A schematic diagram of an electronic device 100 including a camera module 300 provided in at least one embodiment of the present disclosure is shown. The electronic device 100 is, for example, a mobile phone.

[0042] like Figure 1 As shown, the electronic device 100 includes a camera module 300, an image processor 400, and an analog-to-digital converter 500. The electronic device 100 may include more or fewer structures (e.g., screen 200, housing, circuit board, etc.). It is understood that... Figure 1 The electronic device 100 is shown only schematically, and the actual shape, size, location, and construction of these components are not subject to change. Figure 1 limited.

[0043] The camera module 300 can be installed inside the housing of the electronic device 100. The light-incident side of the camera module 300 can be positioned away from the screen 200 of the electronic device 100 to serve as a rear camera. Alternatively, the light-incident side of the camera module 300 can face the side where the screen 200 is located, serving as a front-facing camera of the electronic device 100. The camera module 300 includes, for example, the optical system and photosensitive module provided in some embodiments of this disclosure.

[0044] The housing may have a light-transmitting section, which may be circular, elliptical, or irregular in shape. The light-transmitting section connects the interior of the electronic device 100 to its exterior. Light from outside the electronic device 100 can enter its interior through the light-transmitting section, and the device is dustproof and waterproof. The camera module 300 can collect light from outside the electronic device 100 through the light-transmitting section to capture images or videos.

[0045] Understandable, Figure 1The installation position of the camera module 300 in the illustrated embodiment of the electronic device 100 is merely illustrative, and this disclosure does not strictly limit the installation position of the camera module 300. In some other embodiments, the camera module 300 may also be installed in other positions of the electronic device 100, such as in the upper middle or upper right corner of the back of the electronic device 100.

[0046] The image processor 400 can communicate with the camera module 300. The image processor 400 can acquire and process image data from the camera module 300. The communication connection between the camera module 300 and the image processor 400 can include data transmission via electrical connections such as wiring, or via coupling. It is understood that the camera module 300 and the image processor 400 can also communicate through other methods capable of data transmission. The image processor 400 can include multiple processing modules that can convert the raw image signals captured by the camera module 300 into image information, and transmit the processed information to the display module of the screen for image or video display. The image processor 400 can be an image processing chip or a digital signal processing chip, used to adjust image colors, perform noise reduction, and further improve image quality.

[0047] The working principle of the camera module 300 in the electronic device 100 can be as follows: the light reflected from the subject enters the camera module 300 and generates an optical image, which is projected onto the chip of the photosensitive module of the camera module 300. The photosensitive module converts the optical image into an electrical signal, i.e., an analog image signal, and transmits the converted analog image signal to the analog-to-digital converter 500, so that the analog-to-digital converter 500 converts it into a digital image signal and sends it to the image processor 400. The image processor 400 can run to convert the original image signal captured by the camera module 300 to form image information, and transmit the processed information to the screen for display of the image or video.

[0048] Figure 1 This is merely a schematic diagram illustrating the structure of an electronic device 100. Figure 1The dimensions, quantity, and position of the camera module 300, image processor 400, and analog-to-digital converter 500 shown are merely illustrative and can be adjusted as needed; this disclosure does not impose any limitations on them. It is understood that the number of camera modules 300 can be one or at least two. When there is only one camera module 300, it can be used as a front-facing camera or a rear-facing camera. When there are at least two camera modules 300, these at least two camera modules 300 can be, respectively, telephoto camera modules 300, super-telephoto camera modules 300, etc., to meet different shooting needs; this disclosure does not impose any limitations on them.

[0049] Figure 2 A schematic diagram of a camera module 300 provided in at least one embodiment of the present disclosure is shown.

[0050] like Figure 2 As shown, the camera module 300 includes an optical system and a photosensitive module 4. Light passes through the optical system and is imaged on the photosensitive module 4. It is worth noting that, in order to achieve optical image stabilization and / or autofocus functions, the camera module also includes a movable part (…). Figure 2 Not shown in the image, see [link / reference]. Figure 4 The optical system comprises a movable part (M) and a fixed part (F). A portion of the optical system is mounted on the movable part M, and the other portion is mounted on the fixed part F. By displacing the movable part M relative to the fixed part F, the optical path of the optical system is adjusted, thereby achieving functions such as optical image stabilization, zoom, and / or focusing. The movable part M may include a first movable part M1 that moves during optical image stabilization and a second movable part M2 that moves during optical focusing. The second movable part M2 may move entirely relative to the fixed part F or move separately relative to the fixed part F; that is, there may be one or multiple second movable parts M2 to achieve focusing or zooming functions.

[0051] In some embodiments of this disclosure, such as Figure 2 As shown, the fixing part F of the camera module 300 includes a base 5 and a housing (not shown in the figure). The base 5 and the housing define an installation space. The optical system is disposed within the installation space defined by the base 5 and the housing. The photosensitive module 4 can be disposed inside or outside the base 5. See also Figure 4 The first movable part M1 is movably disposed on the base 5, and the second movable part M2 is also movably disposed on the base 5. A part of the optical system is disposed on the base 5, a part is disposed on the first movable part M1, and a part is disposed on the second movable part M2. Thus, by moving the first movable part M1 and / or the second movable part M2, the optical system can be adjusted, such as to achieve image stabilization, focusing, or zoom functions.

[0052] Figure 3AA schematic diagram of the structure of an optical system 30 provided in at least one embodiment of the present disclosure is shown.

[0053] like Figure 3A As shown, the optical system 30 includes a first reflection module 1, which includes a first optical component 11, a first reflective element 12, and a second optical component 13. The first optical component 11 is located on the light-incident side of the first reflective element 12, and the second optical component 13 is located on the light-outceasing side of the first reflective element 12. The first optical component 11 includes at least two front lenses, which are arranged sequentially along the first optical axis O1. The first optical component 11 is used to converge the light rays incident along the first optical axis O1. The second optical component 13 includes at least one rear lens, which is arranged sequentially along the second optical axis O2. The first reflective element 12 has a first reflective surface 121, which is used to deflect the light rays incident along the first optical axis O1 so that they are emitted along the second optical axis O2.

[0054] It should be noted that in this disclosure, "front group lens" and "rear group lens" are merely names used to distinguish the lenses in the first optical assembly and the lenses in the second optical assembly, and have no limiting effect. For example, at least two front group lenses include lens 11-1 and lens 11-2, and at least one rear group lens includes lens 13-1.

[0055] like Figure 3A As shown, the optical system 30 may include a lens module 2 and a second reflection module 3 (e.g., a pentagonal prism) in addition to the first reflection module. The first reflection module 1 is located on the object side of the lens module 2, and the second reflection module 3 is located on the image side of the lens module 2. The first reflection module 1 is used to converge the light and then bend it to be incident on the lens module 2. The second reflection module 3 is used to reflect the light emitted from the lens module 2 at least twice.

[0056] For example, the optical system 30 consists of a first reflection module 1, a lens module 2, and a second reflection module 3 arranged sequentially from the object side to the image side.

[0057] For example, the first reflection module 1 is used to redirect the propagation direction of the light from a first direction (e.g., after focusing the light beam) to a first direction. Figure 3A The Y-axis direction in the image is changed to a second direction (e.g., Figure 3AThe first optical axis (O1) is perpendicular to the second optical axis (O2). For example, the second optical axis is perpendicular to the first optical axis. For instance, the first reflection module 1 reflects light incident along the first optical axis O1 to the lens module 2. The light then propagates along the second optical axis O2 in the lens module 2 to the second reflection module 3. The second reflection module 3 reflects the incident light at least twice, causing the light to exit along the third optical axis. In some embodiments, the first optical axis O1, the second optical axis O2, and the third optical axis are perpendicular to each other. The first optical axis O1 is parallel to the Y-axis, the second optical axis O2 is parallel to the Z-axis, and the third optical axis O3 is parallel to the X-axis. The X-axis, Y-axis, and Z-axis are three mutually perpendicular coordinate axes in a Cartesian coordinate system. Of course, in other embodiments, the first optical axis O1, the second optical axis O2, and the third optical axis O3 may not be perpendicular to each other. The Y-axis direction may be, for example, the thickness direction of the phone, the Z-axis direction may be, for example, the length direction of the phone, and the X-axis direction may be, for example, the width direction of the phone; or the Y-axis direction may be, for example, the thickness direction of the phone, the X-axis direction may be, for example, the length direction of the phone, and the Z-axis direction may be, for example, the width direction of the phone.

[0058] Understandable, Figure 3A The accompanying drawings below only schematically illustrate some of the components included in the optical system 30; the actual shape, size, location, and construction of these components are not subject to change. Figure 3A As defined in the accompanying figures below. It is understood that the optical system 30 may also include fewer or more structures. For example, the optical system 30 may include more structures, such as lens holders (not shown in the figures).

[0059] The first reflection module of the optical system provided in the embodiments of this disclosure is used to achieve the reversal of the optical path, that is, to reduce the size of the optical system through a periscope architecture. The second reflection module is mainly used to increase the effective focal length of the optical system. Multiple reflections of light within the second reflection module can increase the optical path, thereby achieving the long optical path required for telephoto lenses without significantly increasing the length of the camera module. However, when the optical path of the optical system increases (i.e., the focal length becomes longer), the amount of light entering the lens module needs to be increased to ensure high image quality. Due to physical size requirements, it is difficult to further increase the aperture of the lens module. The embodiments of this disclosure utilize the first reflection module to converge the light to increase the amount of light entering the lens, thereby achieving a large aperture, low shoulder height, high magnification, and long focal length in the camera module.

[0060] The first optical component 11 has positive optical power and is used to converge the incident light rays, thereby increasing the amount of light entering the camera module without changing the physical aperture of the camera module. In other words, it is equivalent to increasing the effective aperture of the camera module. The converged light rays remain converged after being reflected by the first reflecting element 12, meaning the beam diameter is small. This results in a smaller effective optical diameter of the lens in the lens module 2, which helps to reduce the shoulder height GH of the optical system and the shoulder height of the camera module. It is understood that the shoulder height GH of the optical system is not equal to the shoulder height of the camera module. The shoulder height of the camera module is based on GH and also includes the height of the base, housing, carrier, motor, and other structures. However, the shoulder height of the optical system is the main factor affecting the shoulder height of the camera module.

[0061] The second optical component 13 can have negative optical power to better compensate for aberrations and improve the imaging quality of the camera module. In addition, the second optical component 13 can, for example, expand the light beam and increase the beam diameter, so that when optical image stabilization is performed, the MTF drop of the optical system is smaller and the image stabilization effect is better.

[0062] In some embodiments, the first optical component 11 includes at least two front lenses, from the object side to the image side, and each front lens is sequentially denoted as lens 11-1, lens 11-2, ..., lens 11-N, where N is an integer. It is understood that when the first optical component 11 includes three lenses, each lens is sequentially denoted as lens 11-1, lens 11-2, and lens 11-3; when the first optical component 11 includes four lenses, each lens is sequentially denoted as lens 11-1, lens 11-2, lens 11-3, and lens 11-4; and so on.

[0063] Lens 11-1 is the lens closest to the incident light side, and it has the strongest light-gathering ability. In some embodiments of this disclosure, the deflection angle is used to characterize the light-gathering or beam-expanding ability of a lens. The deflection angle is defined as the angle between the light ray after passing through the lens and a straight line parallel to the optical axis. Gathering refers to the lens converging the light rays closer to the optical axis, while beam expansion refers to the lens dispersing the light rays away from the optical axis. Lenses with positive optical power have a gathering effect, while lenses with negative optical power have a beam-expanding effect. In this disclosure, when the deflection angle is positive, it means that the light rays converge closer to the optical axis; when the deflection angle is negative, it means that the light rays disperse away from the optical axis.

[0064] That is, lens 11-1 has positive optical power, and the deflection angle of lens 11-1 is greater than the deflection angle of other lenses in the first optical component 11. After the light is converged by lens 11-1, and then further converged and / or diffused by several other lenses, the first optical component 11 as a whole still exhibits a light-converging effect. For example, the other lenses in the first optical component 11, except for lens 11-1, can all have positive optical power, meaning that each lens in the first optical component 11 converges the light; or, the other lenses can all have negative optical power, meaning that except for lens 11-1, the other lenses expand the light beam; or, some of the other lenses can have positive optical power and some have negative optical power, meaning that some lenses converge the light and some lenses expand the light beam.

[0065] In some embodiments, the deflection angle of lens 11-1 is greater than the absolute value of the deflection angle of other lenses in the first optical assembly 11.

[0066] Figure 3B A schematic diagram of a first optical component 11 provided in at least one embodiment of the present disclosure is shown.

[0067] like Figure 3B As shown, the first optical component 11 includes lenses 11-1, 11-2, and 11-3 arranged sequentially along the first optical axis O1. Each lens has a positive optical power. The deflection angle of lens 11-1 is denoted as A, the deflection angle of lens 11-2 as B, and the deflection angle of lens 11-3 as C, where A > B > 0 and A > C > 0. By maximizing the deflection angle of lens 11-1, as much light as possible can be gathered. Simultaneously, compensation is provided by the other lenses to ensure a better imaging effect. This is because if the light gathering is too strong, the angle at which the light is bent is too large, leading to more pronounced problems such as astigmatism and chromatic aberration during imaging.

[0068] In some other embodiments of this disclosure, the first optical component 11 includes a lens 11-1 and a lens 11-2 arranged sequentially along the first optical axis O1. Lens 11-1 has positive optical power, and lens 11-2 has negative optical power. The deflection angle of lens 11-1 is denoted as A, and the deflection angle of lens 11-2 is denoted as B, where A > 0 > B and A > |B|. Lens 11-2 is suitable for compensating for aberrations and improving the imaging quality of the optical system.

[0069] In some embodiments of this disclosure, the first optical assembly 11 includes at least two front lenses divided into at least one fixed lens and at least one movable lens, with the at least one fixed lens located away from the first reflective element 12 relative to the at least one movable lens. The at least one fixed lens forms a first group, and the at least one movable lens, the first reflective element, and the second optical assembly form a second group.

[0070] For example, in Figure 3A In this example, lens 11-1 is located away from the first reflecting element 12 relative to lens 11-2. Lens 11-1 is a fixed lens, and lens 11-2 is a movable lens. In this example, lens 11-1 forms a first group, and lens 11-2, the first reflecting element 12, and the second optical component 13 form a second group.

[0071] For example, in Figure 3B In the example, lens 11-1 and lens 11-2 are both fixed lenses, and lens 11-3 is a movable lens. In this example, lens 11-1 and lens 11-2 form a first group, and lens 11-3, the first reflecting element 12, and the second optical component 13 form a second group.

[0072] In some embodiments of this disclosure, for example, if the number of active lenses is one, then the second group includes one active lens, a first reflective element 12, and a second optical component 13 (e.g., including one lens), and the second group is used for optical image stabilization (OIS). Therefore, the second group will also be referred to as the OIS group below.

[0073] In some embodiments, the positions of the lenses in the first group are fixed; therefore, in this disclosure, the first group (i.e., at least one fixed lens) is also called a fixed group. The embodiments of this disclosure do not limit the number of at least one fixed lens. The number of movable lenses in the first optical assembly 11 included in the second group is also not limited, and each movable lens is movable. Figure 3A As shown, lens 11-1 is a fixed lens, meaning it is mounted on the fixed part F of the camera module. The other lenses 11-2 of the first optical assembly 11 are movable lenses. Lenses 11-2, the first reflective element 12, and the second optical assembly 13 are mounted on the first movable part M1 of the camera module. When optical image stabilization is performed through the first reflective module 1, as... Figure 4 The first driving unit 14 shown can drive the first movable part M1 to move the other lenses 11-2, the first reflecting element 12, and the second optical component 13 in the first optical assembly 11 relative to the fixed part F. It should be understood that the movement direction of the first movable part M1 includes: rotating about a first axis parallel to the first optical axis O1 to perform a rocking motion; rotating about a second axis parallel to the second optical axis O2 to perform a rotational operation; and rotating about a third axis parallel to the third optical axis O3 to perform a pitching motion.

[0074] Since the movable lens of the first optical component 11, the first reflective element 12, and the second optical component 13 rotate synchronously, the optical path can be corrected by each lens during the image stabilization process of the camera module. The movable lens of the first optical component 11 collects light, and the second optical component 13 can compensate for aberrations. This helps to reduce the size of the camera module, realize the miniaturization of the camera module, and improve the image stabilization effect and image quality of the camera module.

[0075] In some embodiments, lens 11-1 is made of glass, which has a higher refractive index. Other lenses of the first optical component 11 and the lens of the second optical component 11 can be made of glass or plastic.

[0076] In some embodiments, the first reflective element 12 is a first planar reflector having a first reflective surface 121. Light rays emitted from the first optical component along the first optical axis O1 are totally internally reflected by the first reflective surface 121 of the first planar reflector and emitted along the second optical axis O2 to the second optical component 13.

[0077] In other embodiments, the first reflective element 12 is a triangular prism having a first surface, a second surface, and a third surface connected in sequence. The first surface is opposite to the first optical component 11 and is parallel to the first optical axis O1. The third surface is opposite to the second optical component 13 and is perpendicular to the second optical axis O2. The second surface forms a first reflective surface 121. The light emitted from the first optical component 11 passes through the first surface and enters the second surface. The light is reflected and redirected by the second surface and passes through the third surface to exit the second optical component 13.

[0078] In some embodiments of this disclosure, the aperture diameter SD1 of the incident light of the front lens (i.e., the first optical component 11) through which the light first passes and the aperture diameter SD2 of the exit light of the last rear lens (i.e., the second optical component 13) satisfy: 0.2 < (SD1 - SD2) / SD1 < 0.5.

[0079] For example, in Figure 3A In the example, the light first passes through lens 11-1 in the first optical component 11, and the last rear lens is lens 13-1. The aperture diameters SD1 and SD2 of lens 11-1 and lens 13-1 satisfy the condition: 0.2 < (SD1-SD2) / SD1 < 0.5. For example, (SD1-SD2) / SD1 = 0.2933, (SD1-SD2) / SD1 = 0.3670, (SD1-SD2) / SD1 = 0.3773, (SD1-SD2) / SD1 = 0.4422, (SD1-SD2) / SD1 = 0.4444.

[0080] In this embodiment, for example, by adopting an aspherical lens group, increasing the lens thickness of the lens, and using a material with a high refractive index, etc., it is ensured that the light converging ability of the optical system is large enough. This embodiment improves the light converging ability of the fixed group and the OIS group, and can reduce the light aperture by 20% - 50%, making the aperture of the light when it reaches the lens module 2 smaller, which is beneficial to reducing the shoulder height of the lens module, and at the same time is beneficial to reducing the total height SH of the optical system and improving the imaging brightness of the optical system.

[0081] It should be noted that: if the converging ability is too small, it will lead to a relatively large total height and shoulder height of the system, which is not conducive to the miniaturization of the module. If the converging ability is too large, it will lead to a decline in the optical anti - shake performance of the system, and in order to meet the requirements of a large image plane of the lens, it will lead to an increase in the aperture of the last lens of the optical system lens module 2, so the benefit to the shoulder height is not obvious. In addition, in order to balance the system performance and the module size, this will lead to a further increase in the refractive index and Abbe number of the pentagonal prism, thus increasing the stray light risk and production cost of the lens.

[0082] In some embodiments of the present disclosure, the optical power P1 of the first group and the optical power P2 of the second group satisfy: - 3 < P1 / P2 < - 1, P1 > 0.03. The fixed group has a relatively large positive optical power to ensure sufficient light converging ability of the system, improve the imaging brightness and system compactness; the appropriate negative optical power P2 design of the OIS group prevents the deterioration of aberration caused by too large negative optical power of the OIS group, and effectively balances the aberration compensation while ensuring the optical anti - shake performance, making the system have both high imaging quality and excellent anti - shake stability. For example, P1 / P2 = - 2.4255, P1 / P2 = - 1.5161, P1 / P2 = - 1.1327, P1 / P2 = - 1.0618, P1 / P2 = - 1.2155.

[0083] In some embodiments of the present disclosure, the rear surface curvature radius R1 of the last lens in the first group along the light propagation direction and the front surface curvature radius R2 of the first lens in the second group along the light propagation direction satisfy: 1 < R1 / R2 < 6. The rear surface curvature radius of the last lens in the fixed group is close to the front surface curvature radius of the first lens in the OIS group (please refer to the embodiment data and schematic diagram below), and the positive and negative directions are the same, that is, the bending directions of the two are the same, which is beneficial to compressing the anti - shake distance of the OIS group and further reducing the module height while ensuring the anti - shake performance. For example, R1 / R2 = 1.4151, R1 / R2 = 1.0991, R1 / R2 = 5.0233, R1 / R2 = 1.1211, R1 / R2 = 5.8875.

[0084] Figure 4 The schematic diagram of another optical system provided by at least one embodiment of the present disclosure is shown.

[0085] As Figure 4 shown, the lens module 2 includes at least one optical lens 20, and at least one optical lens 20 includes a plurality of lenses. In one embodiment, the lens module 2 includes an optical lens 20 disposed on the second movable part M2, and the second driving unit 25 is adapted to drive the optical lens 20 to move along the second optical axis O2 to achieve optical focusing.

[0086] Figure 5 The figure shows a schematic diagram of another optical system provided by at least one embodiment of the present disclosure.

[0087] As Figure 5 shown, the lens module 2 includes a first optical lens 21 and a second optical lens 22. The first optical lens 21 is disposed on the fixed part F, and the second optical lens 22 is disposed on the second movable part M2. The second driving unit 25 is adapted to drive the second optical lens 22 to move along the second optical axis O2 to achieve optical focusing and optical zoom functions.

[0088] In some other embodiments, the lens module 2 includes three optical lenses 20, four optical lenses 20 or more. Among the plurality of optical lenses 20, a part is fixed and another part is movable. It is worth mentioning that when the plurality of optical lenses 20 are movable, they can move integrally or independently. For example, the imaging module may include a plurality of second movable parts M2, the lens module 2 includes a plurality of optical lenses 20, at least one optical lens 20 is disposed on the fixed part F, and each second movable part M2 is provided with at least one optical lens 20. Functions such as focusing or zooming can be achieved by independently moving each second movable part M2.

[0089] In some embodiments of the present disclosure, the lens module 2, for example, includes 5 lenses. The 5 lenses are movable and are therefore also referred to as a moving group, which is used to achieve autofocus from 1.5 m to infinity.

[0090] In some embodiments of the present disclosure, the optical length AFOL of the lens module and the number of lenses AFLN of the lens module satisfy: 1.3 mm < AFOL / AFLN < 1.8 mm. This can ensure that the overall size of the moving group is small, the size of a single lens plus the air gap is less than 1.8 mm, and the length of the module is extremely compressed. At the same time, in order to balance the correction of chromatic aberration and the processing and molding of the lens, the minimum thickness of a single lens plus the air gap is controlled to be greater than 1 mm. For example, AFOL / AFLN = 1.6600, AFOL / AFLN = 1.5309, AFOL / AFLN = 1.5176, AFOL / AFLN = 1.4610, AFOL / AFLN = 1.4056.

[0091] Optical length is the product of the geometric path length of light as it propagates through a medium and the refractive index of the medium. For a moving group, it is the optically equivalent distance measured along the optical axis from the vertex of the first face (front surface) to the vertex of the last face (back surface), which is the product of the geometric path length and the refractive index of the medium.

[0092] In some embodiments of this disclosure, the angle AOF between the edge rays of the meridional plane and the optical axis in multiple fields of view of the lens module and the effective focal length AFEFL of the lens module satisfy: 0.1 < (max{|AOF|} - min{|AOF|}) / AFEFL < 0.3, where |AOF| is the absolute value of the angle AOF. For example, max{|AOF|} - min{|AOF|}) / AFEFL = 0.1114, max{|AOF|} - min{|AOF|}) / AFEFL = 0.1476, max{|AOF|} - min{|AOF|}) / AFEFL = 0.1984, max{|AOF|} - min{|AOF|}) / AFEFL = 0.2240, max{|AOF|} - min{|AOF|}) / AFEFL = 0.2001.

[0093] Figure 6A and Figure 6B A schematic diagram of the edge rays of the meridional plane in one field of view of the lens module is shown.

[0094] like Figure 6A and Figure 6B As shown, the principal ray R1 is a ray originating from the object point P, passing through the entrance pupil E and the entrance pupil center EO. The entrance pupil center EO is the point where the optical axis passes through the entrance pupil plane. For example, the optical axis is a straight line passing through the entrance pupil center EO and parallel to the Y direction. Figure 6A As shown, the marginal rays include the upper marginal ray R2 and the lower marginal ray R3. The upper marginal ray R2 originates from the object point and passes through the upper edge of the entrance pupil; the lower marginal ray R3 originates from the object point and passes through the lower edge of the entrance pupil. R4 is the sagittal ray in the positive X direction, and R5 is the sagittal ray in the negative X direction. Sagittal rays are rays in an optical system that lie in the sagittal plane (a plane perpendicular to the meridional plane) and are used to describe the sagittal aberration and other characteristics of the optical system. Figure 6B The dashed box in the left image shows a schematic diagram of lens module 2, and the right image is an enlarged view of lens module 2. Figure 6B It can be seen that there is a principal ray R1, an upper edge ray R2, and a lower edge ray R3.

[0095] The meridional plane is the plane containing the principal ray and the optical axis. The principal ray R1, the upper edge ray R2, and the lower edge ray R3 lie within the meridional plane. The angle AOF between the edge rays and the optical axis in a field of view can include the angle between the upper edge ray R2 and the optical axis (e.g., the Y-axis), and the angle between the lower edge ray R3 and the optical axis.

[0096] The above combination Figure 6A and 6B This describes the angle AOF between the edge ray of the meridional plane and the optical axis in a field of view. For each edge ray in multiple fields of view, the angle AOF is related to... Figure 6A and 6B Similarly, among multiple angle AOFs, the angle AOF with the largest absolute value and the angle AOF with the smallest absolute value satisfy: 0.1 < (max{|AOF|} - min{|AOF|}) / AFEFL < 0.3.

[0097] The overall optical power of the optical system dynamic group (i.e., lens module 2) is a small positive value, effectively controlling the light emission angle and ensuring that the light rays have an overall inward-curving effect. This results in a smaller incident aperture when the light enters the second reflection module, which reduces the overall size and weight of the second reflection module and provides more operational space for optimizing stray light in the module. By controlling the principal ray angle (i.e., the included angle AOF) of each field of view within a small range, the uniformity of image illumination is significantly improved, and the problem of increased system sensitivity caused by excessive negative optical power is alleviated.

[0098] like Figure 7-8 As shown, the second reflection module 3 includes a second reflection surface 301 and a third reflection surface 302. The second reflection surface 301 is used to reflect the light incident along the second optical axis O2 to the third reflection surface 302. The third reflection surface 302 reflects the light so that the outgoing light is along the third optical axis O3.

[0099] In some embodiments, the third reflective surface 302 is located between the lens module 2 and the second reflective surface 301 along the direction of the second optical axis O2, which helps to reduce the length of the optical system along the second optical axis O2.

[0100] In some embodiments, along the direction of the third optical axis O3, the third reflective surface 302 and the photosensitive module 4 are located on opposite sides of the second reflective surface 301, thereby increasing the distance between the third reflective surface 302 and the photosensitive module 4 and thus increasing the optical path.

[0101] In some embodiments, such as Figure 7As shown, the angle between the second reflecting surface 301 and the third reflecting surface 302 is α1, and the angle between the imaging surface of the photosensitive module 4 and the second optical axis O2 is β1, where α1 = 45° - β1 / 2. This ensures that after the light is reflected twice by the second reflecting module 3, it can be incident perpendicularly onto the imaging surface of the photosensitive module 4. In other words, the angle between the second reflecting surface 301 and the third reflecting surface 302 is related to the position or angle of the imaging surface of the photosensitive module 4, and the angle between the second reflecting surface 301 and the third reflecting surface 302 can be adjusted according to the position of the photosensitive module 4.

[0102] In some embodiments, the angle between the second reflective surface 301 and the third reflective surface 302 is 45°.

[0103] In some other embodiments, the second reflection module 3 may also include a fourth reflection surface 303, which is used to reflect the light emitted from the second reflection surface 301 to the third reflection surface 302. That is, the second reflection module 3 makes the light undergo three reflections, which further increases the optical path.

[0104] In other embodiments, the second reflection module 3 may further include a fourth reflection surface 303 and a fifth reflection surface 304 (as follows). Figure 11 The fourth reflective surface 303 is used to reflect the light emitted from the second reflective surface 301 to the fifth reflective surface 304, and the fifth reflective surface 304 is used to reflect the light to the third reflective surface 302. That is, the second reflective module 3 makes the light undergo four reflections, which further increases the optical path.

[0105] It is understood that the second reflection module 3 may also include more reflective surfaces to further increase the number of reflections, and this disclosure does not limit this.

[0106] In one specific embodiment, such as Figure 8As shown, the second reflection module 3 is a pentagonal prism, which has a second reflection surface 301 and a third reflection surface 302. The second reflection module 3 includes a first surface, a second surface, a third surface, a fourth surface, and a fifth surface connected in sequence. The first surface faces the lens module 2, and the light of the lens module 2 first enters the prism through the first surface. The second surface faces the photosensitive module 4. The third surface is the second reflection surface 301. The light entering through the first surface is incident on the third surface. After being reflected by the third surface, it is incident on the fifth surface. The fifth surface is the third reflection surface 302. After being reflected by the fifth surface, the light passes through the second surface and enters the photosensitive module 4. The fourth surface connects the third surface and the fifth surface. Preferably, the first surface is parallel to the first optical axis O1, the second surface is parallel to the second optical axis O2, and the second surface is perpendicular to the third optical axis O3. The pentagonal prism reflects the outgoing light of the lens module at least twice and then emits it along the third optical axis O3. The imaging surface of the photosensitive module 4 is arranged parallel to the second optical axis O2, that is, the included angle β1 between the imaging surface of the photosensitive module 4 and the second optical axis O2 is 0°. The included angle α1 between the second reflection surface 301 and the third reflection surface is 45°.

[0107] In some embodiments of the present disclosure, the equivalent focal length EFL of the optical system, the semi-image height of the chip in the photosensitive module (i.e., half of the diagonal of the chip) Himg, the first distance TTL1 between the first reference surface and the first surface, and the second distance TTL2 between the first surface and the second reference surface satisfy: 3.5 < EFL·Himg / (TTL1 + TTL2) < 4.5. The first reference surface is parallel to the first surface, and the first reference surface is the surface where the light ray farthest from the first surface in the direction of the second optical axis O2 is located. The second reference surface is a plane parallel to the first surface and passing through the vertex of the third surface farthest from the first surface in the direction of the second optical axis O2. The first reference surface is, for example, a plane parallel to the outermost field light ray of the first lens along the light propagation direction.

[0108] The following combines Figure 9 to illustrate the first distance TTL1 and the second distance TTL2. Figure 9 FIG. 10 shows a schematic diagram of an optical system 900 provided by at least one embodiment of the present disclosure.

[0109] As Figure 9 shown, (a) is a plan view of the optical system 900 in the YZ plane, and (b) is a plan view of the optical system 900 in the XZ plane.

[0110] As Figure 9 shown in (a) in FIG. 15, in the YZ plane view, the distance from the first surface A1 of the pentagonal prism to the first reference surface B1 is the first distance TTL1. As Figure 9 shown in (a) in FIG. 15, the first reference surface B1 is the surface where the light ray (i.e., the outermost field light ray) farthest from the first surface A1 in the direction of the second optical axis O2 (i.e., the Z direction) is located. As Figure 9As shown in (b), in the XZ plane view, the distance from the first face A1 of the pentagonal prism to the second reference face C1 is the second distance TTL2, as Figure 9 As shown in (b), the second reference face C1 is parallel to the first face A1, and the second reference face C1 passes through the upper vertex Q of the third face. The upper vertex Q is the vertex that is the farthest from the first face A1 in the direction of the second optical axis O2.

[0111] Through multiple optical path folding designs and a compact lens group arrangement method, the system can achieve a larger equivalent focal length within a smaller total length, breaking through the optical path limitation of the traditional periscope design. While ensuring that the lens length is reduced compared to the conventional periscope telephoto lens solution, it has a telephoto ability, ensuring that more details of distant objects can be captured, meeting the dual requirements of high magnification and small size for mobile devices. In addition, it ensures that the system has a larger image plane to present more information of the photographed object, can meet different shooting scenarios, and improves the user experience.

[0112] In some embodiments, at least one lens in the first optical component 11 adopts a trimmed edge structure to reduce the size. As Figure 10 shown, trimming is performed on both sides of the lens. Figure 10 In, the first direction and the second direction are perpendicular to each other, and the first direction is parallel to the trimmed edge of the lens. The first direction is the X-axis direction (for example, the length direction of the mobile phone). For example, the ratio of the size a of the lens in the first direction to the size b in the second direction satisfies: b / a = 70% - 85%, that is, the trimming ratio of the lens is 15% - 30%. By using a lens with a trimmed edge structure, it is beneficial to reduce the size of the camera module.

[0113] In some embodiments of the present disclosure, the total height SH of the optical system and the entrance pupil diameter EPD in the trimmed edge direction of the optical system satisfy: 1.15 < SH / EPD < 1.25. The total height SH is the maximum height of the optical system in the direction of the first optical axis O1, and the trimmed edge direction is the direction parallel to the trimmed edge. Compared with the conventional periscope (prism front-mounted system), in the case of the same optical total height, the aperture of this embodiment can be increased by 15% - 25%. By optimizing the light convergence ability of the light in front of the mirror of the optical system, while the optical total height (AH) satisfies ≤ 12.5 mm, its aperture value, that is, FNO ≤ 3.2, can be ensured, ensuring that the optical system has a high light input, effectively balancing the system brightness and miniaturization requirements.

[0114] As in Figure 1 the example, if the height direction of the camera module 300 is parallel to the thickness direction of the mobile phone, then the trimmed edge direction can be the width direction or the length direction of the camera module 300. For example, the trimmed edge direction is parallel to the second optical axis O2, or parallel to the third optical axis O3.

[0115] Regarding the total height SH of the optical system, please refer to the above description and Figure 3A This will not be elaborated further. For example, the cutting direction is, for instance, the width direction of the camera module 300, and the entrance pupil diameter EPD in the cutting direction is the racetrack-shaped area formed by the length and width of the camera module 300.

[0116] In another embodiment, such as Figure 11 , 12 As shown, the second reflection module 3 includes a second planar reflector and a third planar reflector. The second planar reflector has a second reflecting surface 301, and the third planar reflector has a third reflecting surface 302. The second and third planar reflectors can be connected as a single unit, such as... Figure 11 As shown, it can also be set independently, such as Figure 12 As shown. Further, as... Figure 13 As shown, the second reflection module 3 also includes lenses respectively disposed on the light-incident side and the light-outcident side. The lenses can be used to correct aberrations and improve the imaging quality. That is, the light first passes through the prism on the light-incident side to reach the second plane mirror, and after passing through the second plane mirror, it reaches the third plane mirror. After being reflected by the third plane mirror, it is incident on the lens on the light-outcident side. The optical axis of the lens disposed on the light-incident side coincides with the second optical axis O2, and the optical axis of the lens disposed on the light-outcident side coincides with the third optical axis O3.

[0117] In another embodiment, such as Figure 14 As shown, the second reflective module 3 is a heptagonal prism with a second reflective surface 301, a third reflective surface 302, a fourth reflective surface 303, and a fifth reflective surface 304. The second reflective module 3 includes a first surface, a second surface, a third surface, a fourth surface, a fifth surface, a sixth surface, and a seventh surface connected in sequence. The second surface, the fourth surface, the fifth surface, and the seventh surface are all reflective surfaces. The first surface is opposite to the lens module 2, and the sixth surface is opposite to the photosensitive module 4. The fourth surface is the second reflective surface 301, the seventh surface is the third reflective surface 302, the fifth surface is the fourth reflective surface 303, and the second surface is the fifth reflective surface 304. The light from the lens module 2 first passes through the first surface into the prism, then enters the fourth surface, is reflected by the fourth surface to the seventh surface, is reflected by the seventh surface to the fifth surface, is reflected by the fifth surface to the second surface, is reflected by the second surface to the sixth surface, and finally exits through the sixth surface to the photosensitive module 4.

[0118] The embodiments disclosed herein are particularly suitable for periscope camera modules with large apertures, low height, high magnification, and long focal lengths. The low height and large aperture of the camera module are primarily achieved by the lens on the light-incident side of the first reflecting element 12 to converge the light, while the long focal length is mainly achieved by the second reflecting module reflecting the light at least twice, thus extending the focal length sufficiently to achieve higher magnification, such as 5X, 8X, 10X, 12X, and 15X magnification. In other words, the technical solution of this disclosure not only achieves high magnification but also reduces the size of the camera module to a certain extent, meeting the miniaturization requirements of electronic devices.

[0119] In some embodiments, the photosensitive module 4 can use a chip with a size of 1 / 3 inch to 1 / 2.5 inch. Correspondingly, the image height (IH) of the camera module is 6mm to 7.2mm, such as IH values ​​of 6mm, 6.2mm, 6.8mm, 7mm, and 7.2mm. It is worth noting that the image height is also the diagonal length of the photosensitive module 4 chip; the diagonal length of a 1 / 3-inch chip is 6mm, and the diagonal length of a 1 / 2.5-inch chip is 7.2mm.

[0120] In some embodiments, the effective focal length of the camera module is 31.89mm to 38.27mm, such as 31.89mm, 32mm, 33mm, 34mm, 35mm, 36mm, 37mm, 38mm, 38.27mm, etc. It is worth noting that when using a 1 / 3-inch chip, the effective focal length is preferably 31.89mm, and when using a 1 / 2.5-inch chip, the effective focal length is 38.27mm.

[0121] In some embodiments, the aperture value (FNO) of the camera module is 2.5 to 3.5, for example, it can be 2.5, 2.8, 3.0, 3.2, 3.5, etc.

[0122] In some embodiments, the entrance pupil diameter of the camera module (i.e., the equivalent non-cut-edge entrance pupil diameter) is 9.1mm to 15.308mm, for example, it can be 9.1mm, 10mm, 11mm, 12mm, 14mm, 15mm, 15.308mm, etc.

[0123] In some embodiments, the total height SH of the optical system of the camera module is 12mm to 13.5mm, for example, it can be 12mm, 12.2mm, 12.4mm, 12.6mm, 12.8mm, 13.5mm, etc.

[0124] In some embodiments, the shoulder height GH of the optical system of the camera module is 5.5mm to 7.5mm, for example, it can be 5.5mm, 5.7mm, 5.9mm, 6.1mm, 6.3mm, 6.5mm, 6.7mm, 6.9mm, 7.1mm, 7.3mm, 7.5mm, etc.

[0125] It is worth mentioning that the larger the image plane of the camera module, the greater its shoulder height. The shoulder height can be reduced by chopping the edges of each lens. For example, chopping the edges of each lens in the first optical assembly 11 can also reduce the shoulder height of each lens in the lens module 2.

[0126] The specific structure of the first reflection module will be described in detail in the following embodiments. It is worth mentioning that the second reflection module is not shown in the corresponding figures because the reflected light is perpendicular to the plane of the figure.

[0127] like Figure 15 As shown, from the light-incident side to the light-outcident side of the optical system, the first reflection module 1 includes a first optical component 11, a first reflective element 12, and a second optical component 13 arranged sequentially. The first optical component 11 includes a lens 11-1 and a lens 11-2 arranged sequentially along the light-incident direction. The second optical component 13 includes a lens 13-1. The first optical component 11 has positive optical power, and the second optical component has negative optical power.

[0128] Lens 11-1 has positive optical power, and its ability to gather light rays is greater than that of lens 11-2. In other words, the deflection angle of lens 11-1 is greater than that of lens 11-2.

[0129] Lens 11-2 can be of positive optical power, used to converge light rays to compensate for aberrations and improve the image quality of the optical lens. Lens 11-2 can also be of negative optical power, used to expand light rays to compensate for aberrations and improve the image quality of the optical lens. It is worth noting that when lens 11-2 is of negative optical power, the absolute value of its deflection angle is smaller than that of lens 11-1, thus ensuring that the first optical component 11 as a whole still has positive optical power and a convergence effect. Specifically, the deflection angle of the first optical component 11 for light rays is 15°~25°. It can be understood that the deflection angle of the first optical component 11 for light rays is the angle by which the light rays are deflected relative to the optical axis after passing through all the lenses.

[0130] Lens 13-1 can be of negative optical power, used to expand the light beam to compensate for aberrations and improve the imaging quality of the optical lens.

[0131] Lens 11-1 can be made of glass, while lenses 11-2 and 13-1 can be made of either plastic or glass.

[0132] Furthermore, the effective focal length f can be used to represent the light-gathering ability of a lens; the smaller the effective focal length f, the stronger the light-gathering ability. The effective focal length of lens 11-1 is f1, and the effective focal length of lens 11-2 is f2.

[0133] exist Figure 15 In one embodiment of the example, 0 < f1 < f2, for example, 80 ≤ f1 ≤ 100, 200 ≤ f2 ≤ 350, specifically, f1 = 94.3, f2 = 296.7.

[0134] In another embodiment of Example 1, 0 < f1, f2 < 0, f1 < |f2|, for example, 5 ≤ f1 ≤ 20, -75 ≤ f2 ≤ -100, specifically, f1 = 10.2, f2 = -85.8.

[0135] like Figure 16 As shown, from the light-incident side to the light-outcident side of the optical system, the first reflection module 1 includes a first optical component 11, a first reflective element 12, and a second optical component 13 arranged sequentially. The first optical component 11 includes lenses 11-1, 11-2, and 11-3 arranged sequentially along the light-incident direction. The effective focal length of lens 11-1 is f1, the effective focal length of lens 11-2 is f2, and the effective focal length of lens 11-3 is f3. The second optical component 13 includes lens 13-1. The first optical component 11 has positive optical power, and the second optical component has negative optical power.

[0136] Lens 11-1 has a positive optical power, and its ability to gather light rays is greater than that of lenses 11-2 and 11-3. In other words, the deflection angle of lens 11-1 is greater than that of lens 11-2, and the deflection angle of lens 11-1 is greater than that of lens 11-3.

[0137] exist Figure 16 In the optical system shown, lenses 11-2 and 11-3 are both positive power, meaning they can both converge light rays. However, lens 11-1 has the strongest convergence capability. Lenses 11-2 and 11-3 can compensate for aberrations and improve the imaging quality of the optical system. The first optical component 11 deflects light rays at an angle of 15° to 25°. Furthermore, 0 < f1 < f2, 0 < f1 < f3, specifically, for example, 80 ≤ f1 ≤ 100, 200 ≤ f2 ≤ 350, 150 ≤ f3 ≤ 250. Specifically, for example: f1 = 94.3, f2 = 296.7, f3 = 203.5.

[0138] exist Figure 16In the optical system shown, lenses 11-2 and 11-3 both have negative optical power, meaning they can both expand the light beam, thereby compensating for aberrations and improving the imaging quality of the optical system. It is worth noting that the beam-expanding effect of lenses 11-2 and 11-3 is less than the beam-contracting effect of lens 11-1. Overall, the first optical component 11 still has positive optical power, achieving a beam-contracting effect. The first optical component 11 deflects light at an angle of 15° to 25°. Further, f2 < 0, f3 < 0, 0 < f1 < |f2|, 0 < f1 < |f3|, for example, 5 ≤ f1 ≤ 20, -75 ≤ f2 ≤ -100, -25 ≤ f3 ≤ -40. Specifically, for example: f1 = 10.2, f2 = -85.8, f3 = -32.73.

[0139] exist Figure 16 In the optical system shown, for example, lens 11-2 has positive optical power, and the deflection angle of lens 11-2 is smaller than that of lens 11-1. Lens 11-3 has negative optical power to compensate for aberrations and improve the imaging quality of the optical system. Overall, the first optical component 11 has positive optical power and achieves a beam-converging effect. The deflection angle of the first optical component 11 for light rays is 15°~25°. Further, f3 < 0 < f1 < f2, f1 < |f3|. For example, 5 ≤ f1 ≤ 20, 50 ≤ f2 ≤ 100, -25 ≤ f3 ≤ -40.

[0140] exist Figure 16 In the optical system shown, for example, lens 11-2 has negative optical power to compensate for aberrations and improve the imaging quality of the optical system, while lens 11-3 has positive optical power, and the deflection angle of lens 11-3 is smaller than that of lens 11-1. Overall, the first optical component 11 has positive optical power, achieving a beam-receiving effect, and the deflection angle of the first optical component 11 for light rays is 15°~25°. Furthermore, f2 < 0 < f1 < f3, f1 < |f2|. For example, 5 ≤ f1 ≤ 20, -50 ≤ f2 ≤ -100, 25 ≤ f3 ≤ 40.

[0141] Lens 13-1 can be of negative optical power, used to expand the light beam to compensate for aberrations and improve the imaging quality of the optical lens.

[0142] Lens 11-1 can be made of glass, while lenses 11-2, 11-3, and 13-1 can be made of either plastic or glass.

[0143] like Figure 17As shown, from the light-incident side to the light-exit side of the optical system, the first reflection module 1 includes a first optical component 11, a first reflective element 12, and a second optical component 13 arranged sequentially. The first optical component 11 includes lenses 11-1, 11-2, 11-3, and 11-4 arranged sequentially along the light-incident direction. The second optical component 13 includes lens 13-1. The effective focal length of lens 11-1 is f1, the effective focal length of lens 11-2 is f2, the effective focal length of lens 11-3 is f3, and the effective focal length of lens 11-4 is f4. The first optical component 11 has positive optical power, and the second optical component has negative optical power.

[0144] Lens 11-1 has a positive optical power, and its ability to gather light rays is greater than that of lenses 11-2, 11-3, and 11-4. In other words, the deflection angle of lens 11-1 is greater than that of lens 11-2, the deflection angle of lens 11-1 is greater than that of lens 11-3, and the deflection angle of lens 11-1 is greater than that of lens 11-4.

[0145] exist Figure 17 In the optical system shown, lenses 11-2, 11-3, and 11-4 are all positive power, meaning they can all converge light rays. The first optical component 11 deflects light rays at angles ranging from 15° to 25°. Lens 11-1 has the strongest convergence capability, while lenses 11-2 and 11-3 can compensate for aberrations and improve the imaging quality of the optical system. Furthermore, 0 < f1 < f2, 0 < f1 < f3, and 0 < f1 < f4.

[0146] exist Figure 17 In the optical system shown, lenses 11-2, 11-3, and 11-4 all have negative optical power, meaning they can all expand the light beam, thereby compensating for aberrations and improving the imaging quality of the optical system. It is worth noting that the beam-expanding effect of lenses 11-2, 11-3, and 11-4 is less than the beam-contracting effect of lens 11-1. Overall, the first optical component 11 still has positive optical power, achieving a beam-contracting effect. The first optical component 11 deflects light at an angle of 15° to 25°. Furthermore, f2 < 0, f3 < 0, f4 < 0, 0 < f1 < |f2|, 0 < f1 < |f3|, 0 < f1 < |f4|.

[0147] exist Figure 17 In the optical system shown, for example, lens 11-2 has a positive optical power, lens 11-3 has a negative optical power, and lens 11-4 has a positive optical power, and the first optical component 11 deflects light at an angle of 15° to 25°. That is, the optical powers of the four lenses of the first optical component 11 are arranged in a positive, positive, negative, positive combination, which is more conducive to correcting the aberrations of the optical lens.

[0148] exist Figure 17 In the optical system shown, for example, lens 11-2 has a positive optical power, lens 11-3 has a positive optical power, and lens 11-4 has a negative optical power, and the first optical component 11 deflects light at an angle of 15° to 25°. That is, the optical powers of the four lenses of the first optical component 11 are arranged in a positive-positive-positive-negative combination, which is beneficial for correcting the aberrations of the optical lens.

[0149] exist Figure 17 In the optical system shown, for example, lens 11-2 has a negative optical power, lens 11-3 has a positive optical power, and lens 11-4 has a positive optical power, and the first optical component 11 deflects light at an angle of 15° to 25°. That is, the optical powers of the four lenses of the first optical component 11 are arranged in a positive-negative-positive-positive combination, which is beneficial for correcting the aberrations of the optical lens.

[0150] exist Figure 17 In the optical system shown, for example, lens 11-2 has negative optical power, lens 11-3 has negative optical power, and lens 11-4 has positive optical power, and the first optical component 11 deflects light at an angle of 15° to 25°. That is, the optical powers of the four lenses of the first optical component 11 are arranged in a positive-negative-negative-positive combination, which is beneficial for correcting the aberrations of the optical lens.

[0151] exist Figure 17 In the optical system shown, for example, lens 11-2 has negative optical power, lens 11-3 has positive optical power, and lens 11-4 has negative optical power, and the first optical component 11 deflects light at an angle of 15° to 25°. That is, the optical powers of the four lenses of the first optical component 11 are arranged in a positive-negative-positive-negative combination, which is beneficial for correcting the aberrations of the optical lens.

[0152] exist Figure 17 In the optical system shown, for example, lens 11-2 has a positive optical power, lens 11-3 has a negative optical power, and lens 11-4 has a negative optical power, and the first optical component 11 deflects light at an angle of 15° to 25°. That is, the optical powers of the four lenses of the first optical component 11 are arranged in a positive, positive, negative, negative combination, which is beneficial for correcting the aberrations of the optical lens.

[0153] Lens 13-1 can be of negative optical power, used to expand the light beam to compensate for aberrations and improve the imaging quality of the optical lens.

[0154] Lens 11-1 can be made of glass, while lenses 11-2, 11-3, 11-4, and 13-1 can be made of either plastic or glass.

[0155] Figure 18A schematic diagram of another optical system 1800 provided in at least one embodiment of the present disclosure is shown.

[0156] like Figure 18 As shown, (a) is a plan view of the optical system 1800 in the XZ plane; (b) is a plan view of the optical system 1800 in the YZ plane.

[0157] like Figure 18 As shown in (a) and (b), in this optical system 1800, the lens section is divided into three groups: a first group comprising at least one lens (a fixed group); a second group comprising at least one lens, one mirror, and at least one lens (an OIS group); and a third group comprising five lenses (a dynamic group) for achieving autofocus from 1.5m to infinity. Of course, the fixed group, OIS group, and third group can also have other numbers of lenses.

[0158] The optical system 1800 may also include a fourth group, which can be a fixed group or a movable group. The fourth group, for example, is located between the third group and the second reflection module. For example, both the third and fourth groups are movable, and the distances between the third and fourth groups and the pentagonal prism along the optical axis can be varied during optical focusing and zooming. Alternatively, the third group is movable, and the fourth group is fixed, allowing movement along the optical axis during optical focusing and zooming; the distance between the fourth group and the pentagonal prism is fixed, while the distances between the third and fourth groups and the pentagonal prism are variable. Yet another example: the third group is fixed, and the fourth group is movable; during optical focusing and zooming, the fourth group can move along the optical axis, and the distances between the fourth group and the third group and the pentagonal prism are variable, while the distance between the third group and the pentagonal prism is fixed.

[0159] Following the third group, a pentagonal prism (as a second reflection module) can be included, along with a filter and an image plane. Figure 18 In Figures (a) and (b), the dashed lines represent the optical axis. Figure (a) shows the lens distribution in the non-tangential direction, corresponding to the XZ plane. Figure (b) shows the lens distribution in the non-tangential direction, corresponding to the YZ plane. For example, each lens in the moving group has a tangent of 0-15%, thus ensuring that the module's shoulder height can be lower, meeting the requirements for module miniaturization. Light enters from the positive Y direction of the first group, converges, enters the OIS group, and is deflected by the internal mirrors. Then it enters the third group to achieve focusing. After exiting, it enters the pentagonal prism and deflects the light path twice, further compressing the overall length of the system, and finally forms an image on the chip.

[0160] The number of lenses in the first group can vary, ranging from 1 to 3 lenses. Considering the limitations of the total lens height and the consistency of lens function, a single lens may be used in the design. Since the light is incident from the positive Y direction of the first group, and the OIS group mirrors rotate 45° around the X-axis, the surface contours of the fixed group lenses and the first lens of the OIS group cannot be shown in the XZ plane view in Figure (a). Because the pentagonal prism is obliquely placed, both of its reflecting surfaces rotate around the Y-axis, so the outline of the pentagonal prism is not visible in the YZ plane direction in Figure (b). In addition, to ensure that both the incident and exit surfaces of the pentagonal prism are perpendicular to the optical axis, the angle between the two reflecting surfaces is always maintained at 45° in the design. The number of lenses in the moving group can be 4 to 6. To balance performance and size, for example, the moving group may include five lenses, with the aperture stop located at the very front of the moving group. In addition, in order to provide sufficient assembly space for the dynamic group and take into account the close-range function, the optical design reserved 1.6mm of module space and 1.5mm of close-range focusing travel in front of the dynamic group, and reserved 3.05mm of module space for assembling the dynamic group into the pentagonal prism.

[0161] The design scheme described in this embodiment can overcome the problem that the total length of the traditional integrated zoom optical system is too long when zooming. This is beneficial for controlling the size of the mobile phone and designing the lens structure, while ensuring that its magnification is above 10X.

[0162] The OIS group in the embodiments of this disclosure includes one lens, one mirror, and one reflecting surface, which is lighter in weight compared to the right-angle prism in a traditional periscope lens. Its most significant feature is that the driving device requires less travel and carries less mass, which is more conducive to achieving high-precision, high-speed focusing. In the embodiments of this disclosure, the first group has a greater light-gathering effect; after large-diameter light rays exit through the first group, the beam aperture is significantly reduced, which helps to reduce the size of the OIS group, greatly benefiting both weight and size.

[0163] The following will describe in more detail some specific, but not limiting, examples of embodiments of the present disclosure with reference to the accompanying drawings. It should be noted that, since the optical system has multiple reflecting surfaces, the focal length, thickness, refractive index, radius of curvature, and other information will become the opposite of their original values ​​after each reflection due to the change in coordinates. Therefore, the data provided in the following embodiments (except for the total height AH of the optical system and the length TTL2 of the pentagonal prism in the optical system) are all information of the system without reflectors.

[0164] Figure 19A A structural diagram of an optical system 1000 according to at least one embodiment of the present disclosure is shown.

[0165] like Figure 19AAs shown, the optical system 1000 includes a first lens 1001, a second lens 1002, a reflective element 1003, a third lens 1004, an aperture stop 1005, a fourth lens 1006, a fifth lens 1007, a sixth lens 1008, a seventh lens 1009, an eighth lens 1010, and a pentagonal prism 1011. Additionally, a filter (not shown) may be included after the pentagonal prism. The first lens 1001 and the second lens 1002 form the front lens group, and the third lens 1004 forms the rear lens group.

[0166] Some design parameters of the optical system 1000 according to the first embodiment of this disclosure are shown in Tables 1.1 to 1.3 below.

[0167]

[0168] It should be noted that in the embodiments disclosed herein, in the table, L1 group refers to the first group, used for convergence; MML group refers to the second group, used for image stabilization; and AF group refers to the dynamic group, used for focusing.

[0169] Object represents the object-side surface of optical system 1000; S1 and S2 can represent the object-side surface and image-side surface of the first lens 1001, respectively; S3 and S4 can represent the object-side surface and image-side surface of the second lens 1002, respectively; S5 represents the first reflecting surface of the first reflecting element 1003; S6 and S7 can represent the object-side surface and image-side surface of the third lens 1004, respectively; S8 represents the stop 1005; S9 and S10 can represent the object-side surface and image-side surface of the fourth lens 1006, respectively. S11 and S12 can represent the object-side surface and image-side surface of the fifth lens 1007, respectively; S13 and S14 can represent the object-side surface and image-side surface of the sixth lens 1008, respectively; S15 and S16 can represent the object-side surface and image-side surface of the seventh lens 1009, respectively; S17 and S18 can represent the object-side surface and image-side surface of the eighth lens 1010, respectively; S19 and S20 can represent the first and fifth surfaces of the pentagonal prism 1011, respectively; IR represents the filter; S23 represents the image surface of the photosensitive module.

[0170] In the table above, the radius of curvature and central thickness of the Object are both infinite, which can be understood as the object surface being a plane with an infinite radius of curvature, and the distance from the object to the optical system (object distance) being infinite. This optical system is designed to image "infinitely distant objects" (such as photographing distant mountains, starry skies, and other distant scenes). At this time, the incident light rays are parallel light rays, and the optical system needs to converge these parallel light rays to ultimately form a clear image on the image plane (such as a sensor).

[0171] "Center thickness" describes the distance from the current vertex of the surface to the next vertex along the principal optical axis. For example, the center thickness of S1 refers to the distance between the object-side surface of the first lens and the image-side surface of the first lens. The center thickness of S2 refers to the distance between the image-side surface of the first lens and the object-side surface of the second lens. The center thicknesses of S3 to S22 also refer to the distance from the current vertex of the surface to the next vertex of the surface; please refer to the descriptions of S1 and S2 for details, which will not be repeated here.

[0172] Some design parameters of the pentagonal prism are shown in Table 1.2 below.

[0173]

[0174] The aspherical coefficients of each lens in the optical system 1000 of the first embodiment of this disclosure are shown in Table 1.3 below.

[0175]

[0176] In this first embodiment, EFL·Himg / (TTL1+TTL2)=3.7764, SH / EPD=1.2004; (SD1-SD2) / SD1=0.2933; P1 / P2=-2.4255; R1 / R2=1.4151; AFOL / AFLN =1.6600; (max{|AOFi|}-min{|AOFi|}) / AFEFL=0.1114.

[0177] The optical system 1000 in the above embodiment has a focal length f of -38.22, an uncut Fno (aperture value) of 3.0, a cut Fno (aperture value) of 3.7, and a field of view (FOV) of 10.76 degrees.

[0178] Figure 19B The optical system distortion curve of the first embodiment is shown; Figure 19C The astigmatism curve of the optical system in the first embodiment is shown; Figure 19D The on-axis chromatic aberration curve of the optical system of the first embodiment is shown.

[0179] like Figure 19B As shown, the distortion curve characterizes the relative deviation between the beam convergence point (actual image height) and the ideal image height at different fields of view. The horizontal axis represents the numerical value of the relative distortion, and the vertical axis represents the field of view. In this example, the deviation is small, ensuring that there is no obvious distortion in the image.

[0180] Astigmatism curves are used to illustrate the deviation of the convergence point of a fine beam from the ideal imaging plane in different fields of view. The dashed line represents the beam in the sagittal direction, and the solid line represents the beam in the meridional direction. The horizontal axis represents the deviation along the optical axis, and the vertical axis represents the corresponding field of view. When a value in a certain field of view is too large, the image quality of that field of view is poor or contains higher-order aberrations. For example... Figure 19C As shown, both directional astigmatism are small, and the system has good depth of focus. The axial chromatic aberration curves include spherical aberration curves corresponding to different wavelengths of the system (650nm, 610nm, 555nm, 510nm, 470nm, and 435nm are shown in the figure). The horizontal axis represents the deviation along the optical axis, and the vertical axis represents the normalized coordinates at the pupil. Figure 19D The values ​​are all relatively small, indicating that the on-axis aberrations (spherical aberration, chromatic aberration, etc.) of the optical system are well corrected.

[0181] Figure 20A A structural diagram of an optical system 2000 according to a second embodiment provided in at least one embodiment of the present disclosure is shown.

[0182] like Figure 20A As shown, the optical system 2000 includes a first lens 2001, a second lens 2002, a reflective element 2003, a third lens 2004, an aperture stop 2005, a fourth lens 2006, a fifth lens 2007, a sixth lens 2008, a seventh lens 2009, an eighth lens 2010, and a pentagonal prism 2011. Additionally, a filter (not shown) may be included after the pentagonal prism. The first lens 2001 and the second lens 2002 form the front lens group, and the third lens 2004 forms the rear lens group.

[0183] Some design parameters of the optical system 2000 according to the second embodiment of this disclosure are shown in Tables 2.1 to 2.3 below.

[0184]

[0185] Object represents the object-side surface of the optical system 2000; S1 and S2 can represent the object-side surface and image-side surface of the first lens 2001, respectively; S3 and S4 can represent the object-side surface and image-side surface of the second lens 2002, respectively; S5 represents the first reflecting surface of the first reflecting element 2003; S6 and S7 can represent the object-side surface and image-side surface of the third lens 2004, respectively; S8 represents the aperture stop 2005. S9 and S10 can represent the object-side surface and image-side surface of the fourth lens 2006, respectively; S11 and S12 can represent the object-side surface and image-side surface of the fifth lens 2007, respectively; S13 and S14 can represent the object-side surface and image-side surface of the sixth lens 2008, respectively; S15 and S16 can represent the object-side surface and image-side surface of the seventh lens 2009, respectively; S17 and S18 can represent the object-side surface and image-side surface of the eighth lens 2010, respectively; S19 and S20 can represent the first and fifth surfaces of the pentagonal prism 2011, respectively; IR represents the filter; S23 represents the image surface of the photosensitive module.

[0186] The design parameters of the pentagonal prism are shown in Table 2.2 below.

[0187]

[0188] The aspherical coefficients of each lens in the optical system 2000 of the second embodiment of this disclosure are shown in Table 2.3 below.

[0189]

[0190] In this second embodiment, EFL·Himg / (TTL1+TTL2)=3.9974, SH / EPD=1.1868; (SD1-SD2) / SD1=0.3670; P1 / P2=-1.5161; R1 / R2=1.0991; AFOL / AFLN=1.5309; (max{|AOFi|}- min{|AOFi|}) / AFEFL=0.1984.

[0191] The optical system 2000 in the above embodiment has a focal length f of -38.22, an uncut Fno (aperture value) of 3.0, a cut Fno (aperture value) of 3.7, and a field of view (FOV) of 10.76 degrees.

[0192] Figure 20B The optical system distortion curve of the second embodiment is shown; Figure 20C The astigmatism curve of the optical system according to the second embodiment is shown; Figure 20D The on-axis chromatic aberration curve of the optical system according to the second embodiment is shown.

[0193] like Figure 20B As shown, the deviation is small, which ensures that there is no obvious distortion in the image. Figure 20C As shown, the astigmatism in both directions is small, and the system has a good depth of focus. Figure 20D The values ​​are all relatively small, indicating that the on-axis aberrations (spherical aberration, chromatic aberration, etc.) of the optical system are well corrected.

[0194] Figure 21A A structural diagram of an optical system 3000 according to a third embodiment provided in at least one embodiment of the present disclosure is shown.

[0195] like Figure 21A As shown, the optical system 3000 includes a first lens 30001, a second lens 3002, a reflective element 3003, a third lens 3004, an aperture stop 3005, a fourth lens 3006, a fifth lens 3007, a sixth lens 3008, a seventh lens 3009, an eighth lens 3010, and a pentagonal prism 3011. Additionally, a filter (not shown) may be included after the pentagonal prism. The first lens 3001 and the second lens 3002 form the front lens group, and the third lens 3004 forms the rear lens group.

[0196] Some design parameters of the optical system 3000 according to the third embodiment of this disclosure are shown in Tables 3.1 to 3.3 below.

[0197]

[0198] Object represents the object-side surface of optical system 3000; S1 and S2 can represent the object-side surface and image-side surface of first lens 3001, respectively; S3 and S4 can represent the object-side surface and image-side surface of second lens 3002, respectively; S5 represents the first reflecting surface of first reflecting element 3003; S6 and S7 can represent the object-side surface and image-side surface of third lens 3004, respectively; S8 represents aperture stop 3005; S9 and S10 can represent the object-side surface and image-side surface of fourth lens 3006, respectively; S1 S1 and S12 can represent the object-side surface and image-side surface of the fifth lens 3007, respectively; S13 and S14 can represent the object-side surface and image-side surface of the sixth lens 3008, respectively; S15 and S16 can represent the object-side surface and image-side surface of the seventh lens 3009, respectively; S17 and S18 can represent the object-side surface and image-side surface of the eighth lens 3010, respectively; S19 and S20 can represent the first and fifth surfaces of the pentagonal prism 3011, respectively; IR represents the filter; S23 represents the image surface of the photosensitive module.

[0199] The design parameters of the pentagonal prism are shown in Table 3.2 below.

[0200]

[0201] The aspherical coefficients of the lenses of the optical system according to the third embodiment of this disclosure are shown in Table 3.3 below.

[0202]

[0203] In this third embodiment, EFL·Himg / (TTL1+TTL2)= 3.9498, SH / EPD=1.1797; (SD1-SD2) / SD1=0.3773; P1 / P2=-1.1327; R1 / R2=1.1211; AFOL / AFLN =1.5176; (max{|AOFi|}- min{|AOFi|}) / AFEFL=0.1476.

[0204] The optical system in the above embodiment has a focal length f of -38.22, an uncut Fno (aperture value) of 3.0, a cut Fno (aperture value) of 3.7, and a field of view (FOV) of 10.76 degrees.

[0205] Figure 21B The optical system distortion curve for the third embodiment is shown; Figure 21C The astigmatism curve of the optical system according to the third embodiment is shown; Figure 21D The on-axis chromatic aberration curve of the optical system according to the third embodiment is shown.

[0206] Figure 21B The deviation shown is small, which ensures that there is no obvious distortion in the image. Figure 21C As shown, the astigmatism in both directions is small, and the system has a good depth of focus. Figure 21D The values ​​are all relatively small, indicating that the on-axis aberrations (spherical aberration, chromatic aberration, etc.) of the optical system are well corrected.

[0207] Figure 22A A structural diagram of an optical system 4000 according to a fourth embodiment provided in at least one embodiment of the present disclosure is shown.

[0208] like Figure 22A As shown, the optical system 4000 includes a first lens 4001, a second lens 4002, a reflective element 4003, a third lens 4004, an aperture stop 4005, a fourth lens 4006, a fifth lens 4007, a sixth lens 4008, a seventh lens 4009, an eighth lens 4010, and a pentagonal prism 4011. Additionally, a filter (not shown) may be included after the pentagonal prism. The first lens 4001 and the second lens 4002 form the front lens group, and the third lens 4004 forms the rear lens group.

[0209] Some design parameters of the optical system 4000 according to the fourth embodiment of this disclosure are shown in Tables 4.1 to 4.3 below.

[0210]

[0211] Object represents the object-side surface of the optical system 4000; S1 and S2 can represent the object-side surface and image-side surface of the first lens 4001, respectively; S3 and S4 can represent the object-side surface and image-side surface of the second lens 4002, respectively; S5 represents the first reflecting surface of the first reflecting element 4003; S6 and S7 can represent the object-side surface and image-side surface of the third lens 4004, respectively; S8 represents the aperture stop 4005. S9 and S10 can represent the object-side surface and image-side surface of the fourth lens 4006, respectively; S11 and S12 can represent the object-side surface and image-side surface of the fifth lens 4007, respectively; S13 and S14 can represent the object-side surface and image-side surface of the sixth lens 4008, respectively; S15 and S16 can represent the object-side surface and image-side surface of the seventh lens 4009, respectively; S17 and S18 can represent the object-side surface and image-side surface of the eighth lens 4010, respectively; S19 and S20 can represent the first and fifth surfaces of the pentagonal prism 4011, respectively; IR represents the filter; S23 represents the image surface of the photosensitive module.

[0212] Some design parameters of the pentagonal prism are shown in Table 4.2 below.

[0213]

[0214] The aspherical coefficients of each lens in the optical system 4000 of the fourth embodiment of this disclosure are shown in Table 4.3 below.

[0215]

[0216] In this fourth embodiment, EFL·Himg / (TTL1+TTL2) = 4.0818, SH / EPD = 1.1819; (SD1-SD2) / SD1 = 0.4422; P1 / P2 = -1.0618; R1 / R2 = 5.8875; AFOL / AFLN = 1.4610; (max{|AOFi|}- min{|AOFi|}) / AFEFL = 0.2240.

[0217] The optical system in the above embodiment has a focal length f of -38.22, an uncut Fno (aperture value) of 3.0, a cut Fno (aperture value) of 3.7, and a field of view (FOV) of 10.76 degrees.

[0218] Figure 22B The optical system distortion curve for the fourth embodiment is shown; Figure 22C The astigmatism curve of the optical system according to the fourth embodiment is shown; Figure 22D The on-axis chromatic aberration curve of the optical system according to the fourth embodiment is shown.

[0219] Figure 22B The deviation shown is small, which ensures that there is no obvious distortion in the image. Figure 22C As shown, the astigmatism in both directions is small, and the system has a good depth of focus. Figure 22D The values ​​are all relatively small, indicating that the on-axis aberrations (spherical aberration, chromatic aberration, etc.) of the optical system are well corrected.

[0220] Figure 23A A structural diagram of an optical system 5000 according to a fifth embodiment provided in at least one embodiment of the present disclosure is shown.

[0221] like Figure 23A As shown, the optical system 5000 includes a first lens 5001, a second lens 5002, a reflective element 5003, a third lens 5004, an aperture stop 5005, a fourth lens 5006, a fifth lens 5007, a sixth lens 5008, a seventh lens 5009, an eighth lens 5010, and a pentagonal prism 5011. Additionally, a filter (not shown) may be included after the pentagonal prism. The first lens 5001 and the second lens 5002 form the front lens group, and the third lens 5004 forms the rear lens group.

[0222] Some design parameters of the optical system 5000 according to the fifth embodiment of this disclosure are shown in Tables 5.1 to 5.3 below.

[0223]

[0224] Object represents the object-side surface of optical system 5000; S1 and S2 can represent the object-side surface and image-side surface of the first lens 5001, respectively; S3 and S4 can represent the object-side surface and image-side surface of the second lens 5002, respectively; S5 represents the first reflecting surface of the first reflecting element 5003; S6 and S7 can represent the object-side surface and image-side surface of the third lens 5004, respectively; S8 represents the aperture stop 5005; S9 and S10 can represent the object-side surface and image-side surface of the fourth lens 5006, respectively; S1 S1 and S12 can represent the object-side surface and image-side surface of the fifth lens 5007, respectively; S13 and S14 can represent the object-side surface and image-side surface of the sixth lens 5008, respectively; S15 and S16 can represent the object-side surface and image-side surface of the seventh lens 5009, respectively; S17 and S18 can represent the object-side surface and image-side surface of the eighth lens 5010, respectively; S19 and S20 can represent the first and fifth surfaces of the pentagonal prism 5011, respectively; IR represents the filter; S23 represents the image surface of the photosensitive module.

[0225] Some design parameters of the pentagonal prism are shown in Table 5.2 below.

[0226]

[0227] The aspherical coefficients of each lens in the optical system 5000 of the fifth embodiment of this disclosure are shown in Table 5.3 below.

[0228]

[0229] In this fifth embodiment, EFL·Himg / (TTL1+TTL2)= 4.1013, SH / EPD=1.1737; (SD1-SD2) / SD1=0.4444; P1 / P2=-1.2155; R1 / R2=5.0233; AFOL / AFLN=1.4056; (max{|AOFi|}- min{|AOFi|}) / AFEFL=0.2001.

[0230] The optical system in the above embodiment has a focal length f of -38.22, an uncut Fno (aperture value) of 3.0, a cut Fno (aperture value) of 3.7, and a field of view (FOV) of 10.76 degrees.

[0231] Figure 23B The optical system distortion curve of the fifth embodiment is shown; Figure 23C The astigmatism curve of the optical system according to the fifth embodiment is shown; Figure 23D The on-axis chromatic aberration curve of the optical system according to the fifth embodiment is shown.

[0232] Figure 23B The deviation shown is small, which ensures that there is no obvious distortion in the image. Figure 23C As shown, the astigmatism in both directions is small, and the system has a good depth of focus. Figure 23D The values ​​are all relatively small, indicating that the on-axis aberrations (spherical aberration, chromatic aberration, etc.) of the optical system are well corrected.

[0233] In the above embodiments, the aspherical curve equations of each lens are expressed as follows:

[0234] X represents the relative distance between a point on the aspherical surface at a distance Y from the optical axis and the tangent plane at the intersection point on the optical axis of the aspherical surface; Y represents the perpendicular distance between a point on the aspherical curve and the optical axis; R represents the radius of curvature; k represents the conic coefficient; Ai represents the i-th order aspherical coefficient.

[0235] Another aspect of this disclosure provides a camera module, including an optical system and a photosensitive module provided in any embodiment of this disclosure. The photosensitive module is disposed on the light-emitting side of the optical system and is configured to image the light emitted from the optical system. Figure 24 A schematic diagram of a camera module 2400 provided in at least one embodiment of the present disclosure is shown.

[0236] like Figure 24 As shown, the camera module 2400 includes an optical system 2401 and a photosensitive module 2402.

[0237] The photosensitive module 2402 is located on the light-emitting side of the optical system 2401, and the photosensitive module 2402 is configured to image the emitted light from the optical system 2401.

[0238] The 2400 camera module achieves the long optical path required for telephoto without significantly increasing its length, and increases the amount of light intake by focusing the light, thereby enabling the camera module to have a large aperture, low shoulder height, high magnification, and long focal length.

[0239] The camera module 2400 is similar to the camera module 300 described above, and will not be repeated here. The optical system 2401 in the camera module 2400 can be the optical system provided in any embodiment of this disclosure.

[0240] The basic principles, main features, and advantages of this disclosure have been described above. Those skilled in the art should understand that this disclosure is not limited to the above embodiments. The embodiments and descriptions in the specification are merely the principles of this disclosure. Various changes and modifications can be made to this disclosure without departing from its spirit and scope, and all such changes and modifications fall within the scope of this disclosure as claimed. The scope of protection claimed by this disclosure is defined by the appended claims and their equivalents.

Claims

1. An optical system comprising a first optical component, a first reflective element, a second optical component, a focusing group, and a prism, wherein the first optical component is located on the light-incident side of the first reflective element, and the second optical component is located on the light-outceasing side of the first reflective element. The first optical component consists of two front lenses, each consisting of a first lens and a second lens. These two front lenses are arranged sequentially along a first optical axis. The first optical component is used to converge incident light rays along the first optical axis, and the first reflective element is used to deflect the converged light rays so that they exit along a second optical axis. The second optical component consists of a third lens. The first lens forms a first group, and the first group has positive optical power. The second lens, the first reflecting element, and the third lens form a second group, the second group having negative optical power, and the second lens having negative optical power. The focusing group consists of a fourth lens, a fifth lens, a sixth lens, a seventh lens, and an eighth lens, and the focusing group has positive optical power. The fourth lens has positive optical power, the fifth lens has negative optical power, the sixth lens has negative optical power, the seventh lens has positive optical power, and the eighth lens has positive optical power. The third lens and the focusing group are arranged sequentially along the second optical axis, which is perpendicular to the first optical axis. The object-side surface of the first lens is convex, and the image-side surface of the first lens is concave. The object-side surface of the second lens is convex, and the image-side surface of the second lens is concave. The object-side surface of the third lens is concave. The object-side surface of the fourth lens is convex. The object-side surface of the fifth lens is concave, and the image-side surface of the fifth lens is also concave. The object-side surface of the sixth lens is concave, and the image-side surface of the sixth lens is also concave. The object-side surface of the seventh lens is convex, and the image-side surface of the seventh lens is convex. The object-side surface of the eighth lens is convex, and the image-side surface of the eighth lens is concave. The prism is a pentagonal prism, comprising a first face, a second face, a third face, a fourth face, and a fifth face connected in sequence. The first face faces the image-side of the eighth lens, and the second face faces the photosensitive module for receiving the optical image provided by the optical system. The outgoing light rays emitted from the eighth lens first enter the pentagonal prism through the first face, then enter the third face, are reflected by the third face, and enter the fifth face. After being reflected by the fifth face, the light rays pass through the second face and enter the photosensitive module. The first face is parallel to the first optical axis, the second face is parallel to the second optical axis, and the second face is perpendicular to the third optical axis. The pentagonal prism causes the outgoing light rays to be reflected at least twice before exiting along the third optical axis, which is perpendicular to both the first and second optical axes.

2. The optical system according to claim 1, wherein, The clear aperture diameter SD1 of the incident light rays of the front group lens through which the light rays first pass in the two front group lenses and the clear aperture diameter SD2 of the outgoing light rays of the third lens satisfy: 0.2 < (SD1 - SD2) / SD1 < 0.

5.

3. The optical system according to claim 1, wherein, The two front group lenses include a fixed lens and a movable lens. The fixed lens is farther from the first reflecting element than the movable lens. The first lens is the fixed lens, and the second lens is the movable lens. The optical power P1 of the first group and the optical power P2 of the second group satisfy: -3 < P1 / P2 < -1, where P1 > 0.

03.

4. The optical system according to claim 3, wherein, The rear surface curvature radius R1 of the fixed lens and the front surface curvature radius R2 of the movable lens satisfy: 1 < R1 / R2 < 6.

5. The optical system according to claim 1, wherein, The equivalent focal length EFL of the optical system, the semi-image height Himg of the chip in the photosensitive module, the first distance TTL1 between the first reference plane and the first surface, and the second distance TTL2 between the first surface and the second reference plane satisfy: 3.5 < EFL·Himg / (TTL1 + TTL2) < 4.

5. Among them, the first reference plane is parallel to the first surface, and the first reference plane is the plane where the light ray farthest from the first surface in the second optical axis direction is located. The second reference plane is a plane parallel to the first surface and passing through the vertex farthest from the first surface in the second optical axis direction among the third surfaces.

6. The optical system according to claim 1, wherein, At least one lens in the first optical component has a trimmed edge structure. The total height SH of the optical system and the entrance pupil diameter EPD in the trimmed edge direction of the optical system satisfy: 1.15 < SH / EPD < 1.

25. The total height SH is the maximum height of the optical system in the first optical axis direction, and the trimmed edge direction is the direction parallel to the trimmed edge in the trimmed edge structure.

7. The optical system according to claim 1, wherein, The optical length AFOL of the focusing group and the number of lenses AFLN of the focusing group satisfy: 1.3 < AFOL / AFLN < 1.

8.

8. The optical system according to claim 1, wherein, The angle AOF between the marginal ray of the meridional plane and the optical axis in multiple fields of view of the focusing group and the effective focal length AFEFL of the focusing group satisfy: 0.1 < (max{|AOF|} - min{|AOF|}) / AFEFL < 0.

3. Among them, |AOF| is the absolute value of the angle AOF.

9. The optical system according to claim 1, wherein, The first optical component has a positive optical power, and the second optical component has a negative optical power.

10. A camera module, comprising the optical system according to any one of claims 1-9 and a photosensitive module, wherein, The photosensitive module is disposed on the light-emitting side of the optical system and is configured to image the outgoing light rays of the optical system.

Images