Telephoto lens and terminal equipment

Abstract

The invention relates to electronic equipment, particularly provides a telephoto lens and terminal equipment, and aims to solve the problem that a camera module of the terminal equipment in the prior art is too large in size. To this end, the telephoto lens of the present invention comprises: an image sensor; the zoom lens and the prism are sequentially arranged in the main optical axis direction, and the prism is used for reflecting light passing through the zoom lens to the image sensor. According to the telephoto lens and the terminal equipment, the limitation of the diameter of the zoom lens on the thickness of the camera module can be reduced. An anti-shake module can be additionally arranged on the periphery of the zoom lens while the imaging quality is improved, and the zoom lens is not located between the prism and the image sensor but in front of the prism, so that the added anti-shake module does not cause the thickness of the camera module; and the thickness of the camera module is reduced, so that the thickness of the terminal equipment provided with the telephoto lens is reduced.

Description

Technical Field

[0001] The invention relates to electronic equipment, and in particular provides a telephoto lens. Background Art

[0002] Currently, the application of camera functions on mobile phones is becoming more and more widespread, and consumers have higher and higher requirements for mobile phone cameras, including telephoto photography. To achieve telephoto photography, it is necessary to equip the mobile phone with a telephoto camera module.

[0003] Due to the user's requirements for the appearance and feel of the mobile phone, there are certain restrictions on the thickness of the mobile phone. At present, mobile phones generally integrate the main camera, telephoto, macro and wide-angle lenses on the back of the mobile phone. In order to accommodate these lenses, there is generally a huge bulge on the back of the mobile phone. In the prior art, the telephoto lens or periscope lens is generally located under these bulges rather than inside the bulges, which causes a waste of the internal space of the bulge. And because the diameter of the telephoto lens is large and the focusing function needs to be realized, it is necessary to add a focus motor to the periphery of the lens, and the focus motor needs a certain size space to realize the function. In this way, the size of the telephoto lens module in the thickness direction is the lens diameter + the size of the focus motor. After the size is superimposed, it is larger. The space here directly affects the thickness of the whole machine, and the thickness of the whole machine and the size of the camera module are mutually restricted.

[0004] Accordingly, the art needs a new telephoto lens and terminal device solution to solve the problem of large thickness of the terminal device caused by the large size of the above-mentioned camera module. Summary of the invention

[0005] In order to overcome the above-mentioned defects, the present invention is proposed to provide a telephoto lens and a terminal device that solve or at least partially solve the technical problem of the camera module being too large in size.

[0006] In a first aspect, the present invention provides a telephoto lens,

[0007] As an alternative or supplement to the above scheme, in a method according to an embodiment of the present invention, the telephoto lens provided by the present invention includes: an image sensor; a zoom lens and a prism arranged in sequence along the main optical axis, wherein the prism is used to reflect the light passing through the zoom lens to the image sensor.

[0008] Through such a setting, the zoom lens is placed in front of the prism, which eliminates the limitation that the diameter of the zoom lens will make the camera module too thick. Therefore, a lens with a larger diameter can be selected to achieve better imaging effects without increasing the thickness of the camera module. The thinning of the camera module can reduce the thickness of the terminal device on which the telephoto lens is installed.

[0009] As an alternative or supplement to the above solution, in a method according to an embodiment of the present invention, the photosensitive surface of the image sensor is parallel to the main optical axis of the zoom lens.

[0010] Through such an arrangement, the light reflected by the prism can accurately enter the image sensor. Since the equivalent focus of a telephoto lens is generally longer, the present invention uses a prism to reflect the light passing through the zoom lens and then falls on the photosensitive surface of the image sensor. By folding the light to change the direction of the light, the thickness of the camera module is further reduced.

[0011] As an alternative or supplement to the above solution, in a method according to an embodiment of the present invention, the zoom lens includes at least one focusing lens, and the focusing lens is used to achieve zooming by changing its own shape.

[0012] By setting up at least one focusing lens in the zoom lens, accurate and fast focusing can be achieved. The structure is compact and adaptable, and excellent performance can be achieved in various application scenarios. The focusing lens can change its shape to achieve the focusing effect, eliminating the drive motor outside the zoom lens, so the lens part of the camera module can be further reduced.

[0013] As an alternative or supplement to the above scheme, in a method according to an embodiment of the present invention, the focusing lens includes a piezoelectric layer and a glass film arranged in sequence from top to bottom, wherein the piezoelectric layer is used to deform after being energized and transfer the pressure generated by the deformation to the glass film, and the glass film is used to deform under the action of pressure to achieve focusing.

[0014] Through this setting, the piezoelectric layer is used as the power source of the zoom lens. When voltage is applied, due to the piezoelectric effect, the piezoelectric layer will drive the glass film to deform under the drive of the electrical signal, thereby changing the focal length of the zoom lens. This deformation can be controlled by changing the magnitude and direction of the applied voltage, thereby achieving precise control of the shape of the piezoelectric layer.

[0015] As an alternative or supplement to the above solution, in a method according to an embodiment of the present invention, the piezoelectric layer includes a first piezoelectric film and a second piezoelectric film, wherein the first piezoelectric film and the second piezoelectric film are symmetrically arranged near the edge of the glass film.

[0016] Through such an arrangement, the first piezoelectric film and the second piezoelectric film are arranged at the edge of the glass film relative to each other, forming a symmetrical structure, which helps to achieve uniform regulation of the lens shape, so as to obtain better imaging effects when focusing. In addition, the first piezoelectric film and the second piezoelectric film can provide balanced forces to adjust the shape of the glass film to achieve the demand of fast focusing through their respective working modes, or provide different forces to achieve multiple regulation of the lens shape to meet more complex usage scenarios. Furthermore, the glass film has a high degree of optical transparency, and this deformation does not hinder the transmission of light. In this process, no matter how the shape of the glass film changes, the light can still pass through clearly, which ensures the clarity and brightness of the imaging, so that the lens can provide high-quality images under various environmental conditions. Not only that, although the deformation of the glass film does not hinder the transmission of light, it changes the transmission path of the light. When the glass film is deformed, the direction of travel of the light entering it changes, thereby changing the focus position of the light. By accurately controlling the deformation of the glass film, the focus position of the light can be accurately adjusted, thereby achieving precise focusing. Because the glass film and the piezoelectric layer are tightly connected together, the glass film can respond quickly to the deformation of the piezoelectric layer, which means that the zoom lens can focus quickly, which can provide excellent performance in application scenarios that require fast focusing.

[0017] As an alternative or supplement to the above scheme, in a method according to an embodiment of the present invention, the focusing lens also includes a polymer layer and a glass substrate, wherein the polymer layer is arranged directly below the glass film, and the glass substrate is arranged directly below the polymer layer.

[0018] Through such a setting, the optical performance and flexibility of the polymer layer can be fully utilized, that is, it can ensure that the light entering the lens can be effectively transmitted, and when the upper glass film is deformed, it can follow the deformation well and maintain its structural consistency. This characteristic ensures that when the lens is adjusted rapidly or in a large range of focus, the polymer layer can quickly adapt to the deformation, avoiding possible structural damage or optical performance degradation. Further, the glass substrate, as the basic support part of the focusing lens, not only provides support for the entire lens, but also its excellent optical transparency can ensure that light can pass through without obstacles, and its own rigidity can ensure that the structure of the focusing lens is stable during the entire focusing process, and will not cause loss of optical performance due to deformation. In addition, the polymer layer can also play a protective role. For example, during the actual use of the lens, dust and moisture in the external environment may affect the fine structure inside the lens. At this time, the polymer layer can effectively block these factors that may damage the lens and extend the service life of the lens. The polymer layer not only provides excellent optical performance, but also has good flexibility and protection, so that the lens can maintain high-quality imaging effects under various conditions.

[0019] As an alternative or supplement to the above solution, in a method according to an embodiment of the present invention, a driving motor is disposed outside the zoom mirror, wherein the driving motor is used to drive the zoom mirror to move to achieve zooming.

[0020] With such an arrangement, since the zoom lens is arranged in front of the prism, a low-cost driving motor is used to realize the movement and focusing of the lens without increasing the thickness of the camera module.

[0021] As an alternative or supplement to the above solution, in a method according to an embodiment of the present invention, an anti-shake module is provided on the outer side of the zoom lens, wherein the anti-shake module is used to drive the zoom lens to achieve anti-shake.

[0022] Through such a setting, an anti-shake module is set on the periphery of the zoom lens. Since the zoom lens is not located between the prism and the image sensor but is placed in front of the prism, the added anti-shake module will not increase the thickness of the camera module. The anti-shake effect can be achieved while ensuring the image quality.

[0023] As an alternative or supplement to the above solution, in a method according to an embodiment of the present invention, the anti-shake module includes a magnet and a coil, and the coil is used to be subjected to the Lorentz force in the magnetic field generated by the magnet after being energized to achieve anti-shake of the zoom lens.

[0024] In a second aspect, the present invention provides a terminal device, comprising the telephoto lens of any one of the above embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] The disclosure of the present invention will become more easily understood with reference to the accompanying drawings. It is easy for those skilled in the art to understand that these drawings are only for illustrative purposes and are not intended to limit the scope of protection of the present invention. In addition, similar numbers in the figures are used to represent similar components, among which:

[0026] Figure 1 is a schematic diagram of the structure of a terminal device according to an embodiment of the present invention;

[0027] Figure 2 is a schematic structural diagram of a telephoto lens according to an embodiment of the present invention;

[0028] Figure 3 is a schematic structural diagram of a telephoto lens according to another embodiment of the present invention;

[0029] Figure 4 Schematic diagram of the structure of a focusing lens according to an embodiment of the present invention.

[0030] Reference numerals list :

[0031] 11: zoom lens; 12: prism; 13: image sensor; 20: focusing lens; 21: piezoelectric layer; 211: first piezoelectric film; 212: second piezoelectric film; 22: glass film; 23: polymer layer; 24: glass substrate; 31: drive motor; 41: anti-shake module. DETAILED DESCRIPTION

[0032] Some embodiments of the present invention are described below with reference to the accompanying drawings. It should be understood by those skilled in the art that these embodiments are only used to explain the technical principles of the present invention and are not intended to limit the scope of protection of the present invention. Those skilled in the art can make adjustments to them as needed to adapt to specific application scenarios.

[0033] It should be noted that in the description of the present invention, the terms "upper", "lower", "left", "right", "inner", "outer", etc. indicating directions or positional relationships are based on the directions or positional relationships shown in the drawings, which are only for the convenience of description, and do not indicate or imply that the relevant devices or elements must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, ordinal numbers such as "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0034] In addition, it should be noted that in the description of the present invention, unless otherwise clearly specified and limited, the terms "installation" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium. For those skilled in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0035] Please see attached Figure 1 , Figure 1 1 is a schematic diagram of the structure of a terminal device according to an embodiment of the present invention. The telephoto lens in the embodiment of the present invention mainly includes an image sensor 13 and a zoom lens 11 and a prism 12 arranged in sequence along the main optical axis, wherein the prism 12 is used to reflect the light passing through the zoom lens 11 to the image sensor 13.

[0036] In this embodiment, the zoom lens 11 and the prism 12 are arranged inside a protrusion caused by other lenses (such as a main camera lens) on a terminal device (such as a mobile phone, hereinafter referred to as a mobile phone). Such a setting enables the telephoto lens provided by the present invention to make full use of the internal space of the protruding part of the mobile phone.

[0037] In this embodiment, since a telephoto lens generally has a longer equivalent focal length, if the prism 12 is not used to fold the light, the image sensor 13 needs to be placed directly behind the zoom lens 11, which requires the mobile phone to have additional thickness. In this embodiment, the zoom lens 11 receives external light, and the prism 12 reflects the light passing through the zoom lens 11, and changes the direction of travel of the light through the prism 12, so that the light enters the image sensor 13 in a manner of "sticking to" the back of the mobile phone. This setting frees the thickness of the mobile phone from the limitation brought by the equivalent focal length.

[0038] The image sensor 13 is responsible for converting the received light into an electrical signal to generate a digital image. In one embodiment, the image sensor 13 is a high-performance CMOS sensor. The CMOS sensor has the characteristics of high pixel count, good image quality, and low noise, which can meet the high requirements of mobile phone cameras for image quality. At the same time, due to the low power consumption of the CMOS sensor, the battery life of the mobile phone can also be greatly improved.

[0039] In this embodiment, since the zoom lens is placed in front of the prism, the limitation that the diameter of the zoom lens will make the camera module too thick is eliminated. Therefore, a lens with a larger diameter can be selected to achieve better imaging effects without increasing the thickness of the camera module. The thinning of the camera module further reduces the thickness of the mobile phone installed with the telephoto lens. Through such a design, the prism 12 effectively changes the propagation path of the light, so that the light is reflected to the image sensor 13. In this way, even if the zoom lens 11 is arranged along the thickness direction of the mobile phone, it can ensure that the light accurately enters the image sensor 13 to achieve clear imaging. At the same time, this design also effectively shortens the length of the telephoto lens, so that the thickness of the mobile phone can be reduced, which is more in line with the design concept of light and portable mobile devices. Moreover, the use of the prism 12 in this way can enable a relatively thin mobile device to be loaded with a lens with a larger focal length in a smaller space.

[0040] See also Figure 2 , Figure 2 : is a schematic diagram of the structure of a telephoto lens according to an embodiment of the present invention. In this embodiment, a driving motor 31 is provided on the outside of the zoom lens 11, and the driving motor 31 is used to drive the zoom lens 11 to move to achieve zooming. The mobile phone camera system captures the user's focus operation information, converts the operation information into a current and / or voltage signal so that the driving motor 31 drives the zoom lens 11 and / or the lens included in the zoom lens 11 to move forward and backward to achieve a focusing effect. Since in the technical solution of the telephoto lens provided by the present invention, the zoom lens 11 is placed in front of the prism 12 instead of between the prism 12 and the image sensor 13, the added driving motor 31 does not increase the thickness of the camera module.

[0041] In the present embodiment, an anti-shake module 41 is further provided on the outside of the zoom lens 11. The anti-shake module 41 can use a motor to adjust the angle of the zoom lens 11 in real time according to the current and / or voltage signal to achieve anti-shake, or can use the Lorentz force in the electromagnetic effect to adjust the zoom lens 11 to achieve anti-shake. In the present embodiment, the anti-shake module 41 includes a magnet and a coil, wherein the magnet is used to generate a magnetic field, and the coil receives the Lorentz force in the magnetic field after being energized to achieve anti-shake of the zoom lens 11. In one embodiment, the mobile phone camera system captures the shaking state of the mobile phone in real time, generates corresponding current and / or voltage signals according to the shaking state, and the current direction inside the coil changes continuously, causing the direction of the Lorentz force on the coil to change, and the coil drives the zoom lens 11 to move in the opposite direction of the shaking direction of the mobile phone to achieve the anti-shake effect.

[0042] In one embodiment, the focus and anti-shake functions of the zoom lens 11 are integrated on the drive motor 31. Since in the technical solution of the telephoto lens provided by the present invention, the zoom lens 11 is not horizontally located between the prism 12 and the image sensor 13, the superimposed size of its lens diameter + the drive motor size (focus + anti-shake) does not increase the thickness between the prism 12 and the image sensor 13, that is, the superimposed size does not increase the overall thickness of the mobile phone.

[0043] See also Figure 3 , Figure 3 FIG. 1 is a schematic diagram of the structure of a telephoto lens according to another embodiment of the present invention. In this embodiment, the zoom lens 11 includes at least one focusing lens 20, and the focusing lens 20 achieves zooming by changing its shape. Figure 2 In the embodiment shown, although the superimposed size of the lens diameter + the drive motor size (focusing + anti-shake) does not increase the thickness between the prism 12 and the image sensor 13, the size of the lens part of the camera module in the x and y directions does not decrease. In this embodiment, by setting a focus lens 20 that changes its shape to achieve a focusing effect, the drive motor 31 outside the zoom lens 11 is omitted, so the lens part of the camera module can be further reduced. By using at least one focus lens 20 in the zoom lens 11 to achieve accurate and fast focusing, compared with Figure 2 In the embodiment shown, the camera module in this embodiment has a compact structure and strong adaptability, and can exert excellent performance in various application scenarios.

[0044] In this embodiment, the focusing lens 20 includes a piezoelectric layer 21 and a glass film 22 arranged in sequence from top to bottom, wherein the piezoelectric layer 21 is used to deform after being energized and transfer the pressure generated by the deformation to the glass film 22, and the glass film 22 is used to deform under the action of pressure to achieve focusing. The piezoelectric layer 21 includes a first piezoelectric film 211 and a second piezoelectric film 212, wherein the first piezoelectric film 211 and the second piezoelectric film 212 are symmetrically arranged near the edge of the glass film 22.

[0045] In this embodiment, the piezoelectric layer 21 is the power source of the zoom lens 11. When a voltage is applied, due to the piezoelectric effect, the piezoelectric layer 21 will drive the glass film 22 to deform under the drive of the electrical signal, thereby changing the focal length of the zoom lens 11. This deformation can be controlled by changing the magnitude and direction of the applied voltage, thereby achieving precise control of the shape of the piezoelectric layer 21. This is the key to achieving precise focusing.

[0046] In this embodiment, the piezoelectric layer 21 includes a first piezoelectric film 211 and a second piezoelectric film 212. In this embodiment, the first piezoelectric film 211 and the second piezoelectric film 212 are arranged at the edge of the glass film 22 to form a symmetrical structure. This symmetrical structure helps to achieve uniform regulation of the lens shape, thereby obtaining a better imaging effect when focusing. The first piezoelectric film 211 is electrically connected to the second piezoelectric film 212. The electrical connection design between the first piezoelectric film 211 and the second piezoelectric film 212 allows them to work together to provide a balanced force to adjust the shape of the glass film 22. This collaborative work can not only improve the accuracy of focusing, but also improve the speed of focusing, so that this focusing lens can respond to the needs of taking pictures faster. In addition, by adjusting the electrical connection method between the first piezoelectric film 211 and the second piezoelectric film 212, various adjustments to the lens shape can be achieved. For example, by changing the direction of the electrical signal, the asymmetric adjustment of the lens shape can be achieved, thereby achieving more complex focusing requirements.

[0047] In this embodiment, the glass film 22 receives pressure from the piezoelectric layer 21 and is deformed as a result. This deformation changes the shape of the glass film 22 to achieve a focusing effect. Specifically, on the one hand, since the glass film 22 has a high degree of optical transparency, this deformation does not hinder the transmission of light. In this process, no matter how the shape of the glass film 22 changes, the light can still pass through clearly, which ensures the clarity and brightness of the imaging, so that the lens can provide high-quality images under various environmental conditions. On the other hand, although the deformation of the glass film 22 does not hinder the transmission of light, it does change the transmission path of the light. When the glass film 22 is deformed, the traveling direction of the light incident therein changes, thereby changing the focal position of the light. By precisely controlling the deformation of the glass film 22, the focal position of the light can be precisely adjusted, thereby achieving precise focusing. In this embodiment, since the glass film 22 and the piezoelectric layer 21 are tightly connected together, the glass film 22 can quickly respond to the deformation of the piezoelectric layer 21. This means that the zoom lens 11 can focus quickly, which can provide excellent performance in application scenarios that require fast focusing.

[0048] In this embodiment, the focusing lens 20 further includes a polymer layer 23 and a glass substrate 24 , wherein the polymer layer 23 is disposed directly below the glass film 22 , and the glass substrate 24 is disposed directly below the polymer layer 23 .

[0049] In this embodiment, the polymer layer 23 itself has excellent optical properties. It not only has a high light transmittance to ensure that the light entering the lens can be effectively transmitted, but also has excellent dispersion performance to reduce the chromatic aberration caused by light refraction, thereby ensuring the color authenticity of the image. In addition, the polymer layer 23 also has good flexibility. When the upper glass film 22 is deformed under the drive of the piezoelectric layer 21, the polymer layer 23 can follow this deformation well and maintain its structural consistency. This characteristic ensures that when the lens is performing rapid or large-scale focus adjustment, the polymer layer 23 can quickly adapt to the deformation, avoiding possible structural damage or optical performance degradation. In addition, the polymer layer 23 can also play a protective role. For example, during the actual use of the lens, the external environment such as dust and moisture may affect the fine structure inside the lens. At this time, the polymer layer 23 can effectively block these factors that may damage the lens and extend the service life of the lens. Therefore, the polymer layer 23 not only provides excellent optical performance, but also has good flexibility and protection, so that the lens can maintain high-quality imaging effects under various conditions.

[0050] In this embodiment, the glass substrate 24 serves as the basic support part of the focusing lens 20. It not only provides support for the entire lens, but also its excellent optical transparency can ensure that light can pass through without obstacles. The glass substrate 24 has sufficient rigidity to ensure that the structure of the focusing lens 20 is stable during the entire focusing process, and there will be no loss of optical performance due to deformation.

[0051] So far, the technical solutions of the present invention have been described in conjunction with the preferred embodiments shown in the accompanying drawings. However, it is easy for those skilled in the art to understand that the protection scope of the present invention is obviously not limited to these specific embodiments. Without departing from the principle of the present invention, those skilled in the art can make equivalent changes or substitutions to the relevant technical features, and the technical solutions after these changes or substitutions will fall within the protection scope of the present invention.

Claims

1. A telephoto lens, characterized in that: include: Image sensor (13); A zoom lens (11) and a prism (12) are arranged in sequence along a main optical axis direction, wherein the prism (12) is used to reflect light passing through the zoom lens (11) to the image sensor (13).

2. The telephoto lens according to claim 1, wherein: The photosensitive surface of the image sensor (13) is parallel to the main optical axis of the zoom lens (11).

3. The telephoto lens according to claim 2, wherein: The zoom lens (11) comprises at least one focusing lens (20), and the focusing lens (20) is used to achieve zooming by changing its own shape.

4. The telephoto lens according to claim 3, wherein: The focusing lens (20) comprises a piezoelectric layer (21) and a glass film (22) arranged in sequence from top to bottom, wherein the piezoelectric layer (21) is used to deform after being energized and to transfer the pressure generated by the deformation to the glass film (22), and the glass film (22) is used to deform under the action of pressure to achieve focusing.

5. The telephoto lens according to claim 4, wherein: The piezoelectric layer (21) comprises a first piezoelectric film (211) and a second piezoelectric film (212), wherein the first piezoelectric film (211) and the second piezoelectric film (212) are symmetrically arranged at positions close to the edge of the glass film (22).

6. The telephoto lens according to claim 4, wherein: The focusing lens (20) further comprises a polymer layer (23) and a glass substrate (24), wherein the polymer layer (23) is arranged directly below the glass film (22), and the glass substrate (24) is arranged directly below the polymer layer (23).

7. The telephoto lens according to claim 2, wherein: A driving motor (31) is arranged outside the zoom mirror (11), wherein the driving motor (31) is used to drive the zoom mirror (11) to move to achieve zooming.

8. The telephoto lens according to any one of claims 1 to 7, wherein: An anti-shake module (41) is arranged outside the zoom lens (11), wherein the anti-shake module (41) is used to drive the zoom lens (11) to achieve anti-shake.

9. The telephoto lens according to claim 8, wherein: The anti-shake module (41) comprises a magnet and a coil, and the coil is used to be subjected to the Lorentz force in the magnetic field generated by the magnet after being energized, so as to achieve anti-shake of the zoom lens (11).

10. A terminal device, characterized in that: The device comprises the telephoto lens according to any one of claims 1 to 9.

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