WO2022032729A1 - Mobile terminal having built-in anamorphic lens - Google Patents

Abstract

Disclosed in the present application is a mobile terminal having a built-in anamorphic lens. A widescreen anamorphic lens is mounted in the mobile terminal; the mobile terminal is provided with an image correction module having an anamorphic coefficient anti-extrusion anamorphic function and an optical distortion correction function on camera software; the image correction module is used for performing real-time correction on an image and a video which have optical distortion anamorphosis and anamorphic lens extrusion anamorphosis and are captured by the widescreen anamorphic lens mounted in the mobile terminal, thereby satisfying user requirements of easily and quickly obtaining anamorphosis-free widescreen photos and videos by using the mobile terminal.

Description

A mobile terminal with built-in anamorphic lens technical field

The present application relates to the technical field of mobile phone lenses, and in particular, to a mobile terminal with a built-in anamorphic lens.

Background technique

The number of built-in cameras in mobile phones is increasing, and mainstream flagship mobile phones on the market have built-in wide-angle cameras, ultra-wide-angle cameras, telephoto cameras, and macro cameras. With the development of technology and demand in the future, there is bound to be a great demand for simple and fast shooting of wide-screen pictures and videos using mobile phones, which cannot be achieved by current mobile phone software and hardware.

SUMMARY OF THE INVENTION

Therefore, the technical problem to be solved by the present application is to overcome the defect that the built-in lens on the mobile phone in the prior art cannot realize the wide-screen shooting function, thereby providing a mobile terminal with a built-in anamorphic lens.

In order to solve the above-mentioned technical problems, the technical scheme of the present application is as follows:

A mobile terminal with a built-in anamorphic lens, the mobile terminal has a built-in wide-screen anamorphic lens; the mobile terminal comes with an image correction module with a deformation coefficient anti-squeeze deformation function and an optical distortion correction function on its own camera software, so the The image correction module is used to perform real-time correction on the images and videos with optical distortion and distortion of the anamorphic lens taken in by the wide-screen anamorphic lens built in the mobile terminal.

Further, the wide-screen anamorphic lens includes a front lens group, a refractive element, and a rear lens group arranged in sequence; the refractive element is located on the optical path of the incident light incident through the front lens group and refracts the incident light. to the rear lens group; the included angle between the main optical axis of the front lens group and the main optical axis of the rear lens group is less than 180 degrees.

Further, the main optical axis of the front lens group and the main optical axis of the rear lens group are perpendicular to each other.

Further, the front lens group is a cylindrical lens group composed of at least three cylindrical lenses; the rear lens group is a spherical lens group composed of at least four aspherical lenses.

Further, the thickness of the front lens group along the optical axis is not greater than 5.50mm; the thickness of the rear lens group along the optical axis direction is not greater than 5.20mm; the thickness of the refractive element along the optical axis direction is not greater than 2.40mm.

Further, the cylindrical lens group includes a first lens, a second lens and a third lens arranged in sequence from the object side to the image side along the optical axis, and the first lens and the second lens have negative focal lengths cylindrical lens, the third lens is a positive refractive power cylindrical lens; the spherical lens group includes a fourth lens, a fifth lens, a sixth lens, and a fourth lens, a fifth lens, a sixth lens, and a fourth lens, which are arranged in sequence from the object side to the image side along the optical axis. Seven lenses; the fourth lens, the fifth lens, the sixth lens and the seventh lens are all even-order aspherical lenses.

Further, the front lens group is a spherical lens group composed of at least four aspherical lenses; the rear lens group is a cylindrical lens group composed of at least three cylindrical lenses.

Further, the wide-screen anamorphic lens is also provided with a photosensitive element, and the main optical axis of the rear lens group coincides with the main optical axis of the photosensitive element; the mobile terminal is internally provided with the photosensitive element. Connected image rectification module with deformation coefficient back-squeeze function.

Further, the inflection element is a triangular prism, a plane mirror or a pentaprism.

Further, the mobile terminal is a mobile phone or a tablet computer.

The technical solution of the present application has the following advantages:

1. The mobile terminal with a built-in anamorphic lens provided by this application, by building a compact wide-screen anamorphic lens on the mobile terminal, utilizes the image correction module of the mobile terminal's own camera software to ingest the wide-screen anamorphic lens. Images with squeezing deformation and optical distortion are deformed and corrected, and wide-screen pictures and videos can be obtained by shooting with a mobile terminal, so as to meet the needs of users for wide-screen shooting on mobile terminals.

2. A mobile terminal with a built-in anamorphic lens provided by this application, a refractive element is arranged between the front lens group and the rear lens group of the wide-screen anamorphic lens, and the refractive element can change the direction of the light path, thereby making the front lens group and the rear lens group. The rear lens group can be arranged in a non-linear form, such as a periscope 'L' shape, which is beneficial to the built-in wide-screen anamorphic lens on the mobile terminal.

3. The mobile terminal provided by this application with a built-in anamorphic lens, the wide-screen anamorphic lens utilizes the optical characteristics of the front lens group composed of three cylindrical lenses to "compress" the incident light entering horizontally, while the incident light entering in the vertical direction is "compressed". The incident light remains unchanged, and the incident light is comprehensively corrected by the rear lens group, thereby increasing the field of view of the horizontal shooting of the lens, making the aspect ratio of the actual shooting picture larger, so as to realize wide-screen photos and videos. function.

4. In the mobile terminal provided by this application with a built-in anamorphic lens, the thickness of the front lens group along the optical axis is not greater than 5.50 mm; the thickness of the rear lens group along the optical axis direction is not greater than 5.20 mm; the refractive element is along the optical axis. The thickness in the direction is not more than 2.40mm; the overall size is small, and the optical axis of the front lens group and the optical axis of the rear lens group are perpendicular, so that this wide-screen anamorphic lens can be built into a thin mobile terminal.

Description of drawings

In order to more clearly illustrate the specific embodiments of the present application or the technical solutions in the prior art, the accompanying drawings that need to be used in the description of the specific embodiments or the prior art will be briefly introduced below. The drawings are some embodiments of the present application. For those of ordinary skill in the art, other drawings can also be obtained from these drawings without any creative effort.

1 is a schematic structural diagram of a lens group in Embodiment 1 of the present application;

2 is an optical path diagram of a lens group in Embodiment 1 of the present invention;

Fig. 3 is the optical distortion curve of the lens group in the first embodiment of the application, the abscissa is the distortion percentage, and the ordinate is the field of view angle;

4 is a modulation transfer function (MTF) curve of the lens group in the first embodiment of the present invention, wherein the abscissa represents the spatial frequency, and the ordinate represents the MTF value.

DESCRIPTION OF REFERENCE NUMERALS: P1, first lens; P2, second lens; P3, third lens; PM, refractive element; P4, fourth lens; P5, fifth lens; P6, sixth lens; P7, first lens seven lenses;

1. The object side of the first lens; 2. The image side of the first lens; 3. The object side of the second lens; 4. The image side of the second lens; 5. The image side of the third lens; 6. The refractive element 7, the light exit surface of the refractive element; 8, the object side of the fourth lens; 9, the image side of the fourth lens; 10, the diaphragm; 11, the object side of the fifth lens; 12, the first The image side of the five lenses; 13, the object side of the sixth lens; 14, the image side of the sixth lens; 15, the object side of the seventh lens; 16, the image side of the seventh lens.

detailed description

The technical solutions of the present application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are part of the embodiments of the present application, but not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present application.

In the description of this application, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. The indicated orientation or positional relationship is based on the orientation or positional relationship shown in the accompanying drawings, which is only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the indicated device or element must have a specific orientation or a specific orientation. construction and operation, and therefore should not be construed as limitations on this application. Furthermore, the terms "first", "second", and "third" are used for descriptive purposes only and should not be construed to indicate or imply relative importance.

In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installed", "connected" and "connected" should be understood in a broad sense, for example, it may be a fixed connection or a detachable connection Connection, or integral connection; can be mechanical connection, can also be electrical connection; can be directly connected, can also be indirectly connected through an intermediate medium, can be internal communication between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood in specific situations.

In addition, the technical features involved in the different embodiments of the present application described below can be combined with each other as long as there is no conflict with each other.

Example 1

A mobile terminal with a built-in anamorphic lens, a compact wide-screen anamorphic lens is built in the mobile terminal; an image correction module with a deformation coefficient anti-squeeze deformation function and an optical distortion correction function is provided on the camera software of the mobile terminal. , the image correction module is used for real-time correction of the images and videos with optical distortion and distortion of the anamorphic lens taken by the built-in wide-screen anamorphic lens of the mobile terminal. Therefore, the user's demand for wide-screen photography of the mobile terminal can be satisfied, and the user's demand for the mobile terminal's wide-screen photography can be satisfied. The mobile terminal may be a mobile electronic terminal such as a mobile phone and a tablet.

In this embodiment, the optical structure schematic diagram and optical path diagram of the wide-screen anamorphic lens are shown in Figures 1 and 2, respectively. The wide-screen anamorphic lens includes a front lens group, a refractive The element PM, the rear lens group, the refractive element PM is located on the optical path of the incident light incident through the front lens group and refracts the incident light to the rear lens group, the main optical axis of the front lens group and the main optical axis of the rear lens group are perpendicular to each other . In other embodiments, the included angle between the main optical axis of the front lens group and the main optical axis of the rear lens group may also be any other angle less than 180 degrees.

In this embodiment, the front lens group is a cylindrical lens group composed of three cylindrical lenses, the refractive element PM is any one of a plane mirror, a triangular prism or a pentaprism, and the rear lens group is composed of four aspherical lenses composed of spherical lenses. The wide-screen anamorphic lens arranged in this structure has a horizontal drawing effect on the captured image. Of course, it can be understood here that the number of cylindrical lenses constituting the cylindrical lens group may also be four or more, and the number of spherical lenses constituting the spherical lens group may also be four or more, as long as the cylindrical lenses are constituted The cylindrical lens of the group can "compress" the incident light entering horizontally, while the incident light entering in the vertical direction remains unchanged. The increase of the field angle increases the aspect ratio of the actual shot, and it is sufficient to obtain wide-screen video or photos without sacrificing pixels.

In this embodiment, the cylindrical lens group includes a first lens P1, a second lens P2 and a third lens P3 which are arranged in sequence from the object side to the image side along the optical axis; the first lens P1 and the second lens P2 are negative The refractive power cylindrical lens, and the third lens P3 is a positive refractive power cylindrical lens. The spherical lens group includes a fourth lens P4, a fifth lens P5, a sixth lens P6 and a seventh lens P7 which are sequentially arranged along the optical axis from the object side to the image side; the fourth lens P4, the fifth lens P5 and the sixth lens Both P6 and the seventh lens P7 are even-order aspherical lenses. The aspheric coefficient of an aspheric lens satisfies the following equation:

Z=cy ² /[1+{1−(1+k)c ² y ² } ^+1/2 ]+A ₄ y ⁴ +A ₆ y ⁶ +A ₈ y ⁸ +A ₁₀ y ¹⁰

Among them: Z is the sag of aspheric surface, c is the paraxial curvature of the aspheric surface, y is the lens diameter, k is the conic coefficient, A4 is the _4th -order aspherical coefficient, A6 is the _6th -order aspherical coefficient, and A8 is the _8th -order aspherical coefficient The spherical coefficient, A ₁₀ , is a tenth-order aspheric coefficient.

In this embodiment, the object side surface and the image side near optical axis of the first lens P1 are concave surfaces, the object side surface near the optical axis of the second lens P2 is convex, and the image side near optical axis of the second lens P2 is concave , the image side of the third lens P3 is convex at the near optical axis, the angle between the light incident surface of the refractive element PM and the optical axis of the third lens P3 is 45 degrees, and the image side and the object side of the fourth lens P4 are at the low beam The axis is convex, which is a biconvex lens, the object side of the fifth lens P5 is concave at the near optical axis, and the image side and object side of the sixth lens P6 are convex at the near optical axis, which is a biconvex type. lens; the object side of the seventh lens P7 is convex at the near optical axis, the image side of the seventh lens P7 is concave at the near optical axis, and both the object side and the image side have inflection points off-axis.

In this embodiment, the thickness of the front lens group along the optical axis is 5.50 mm; the thickness of the rear lens group along the optical axis direction is 5.20 mm; the thickness of the refractive element PM along the optical axis direction is 2.40 mm. Of course, the sizes of the front lens group, the rear lens group and the refractive element PM can also be reduced in appropriate proportions.

The parameters of each lens in this embodiment are listed below:

	face shape	x_radius	Y_radius	thickness	grass
1	Cylindrical aspheric	-5.6319	inf	1.2000	4875.704
2	Cylindrical aspheric	4.2548	inf	0.3500
3	cylinder	10.1807	inf	1.200	8467.237
4	cylinder	3.5438	inf	2.3500	9108.352
5	Cylindrical aspheric	-13.1972	inf	0.1000
6	Prism	Inf	inf	2.400	HK9L
7		inf	inf	0.1000
8	Aspherical	1.8974	1.8974	0.5781	4875.704
9	Aspherical	-6.9488	-6.9488	0.2905
10	Stop	Inf	Inf	0.0500
11	Aspherical	8.5199	8.5199	0.6503	7283.283
12	Aspherical	1.8672	1.8672	1.0002
13	Aspherical	3.2485	3.2485	1.1911	5917.606
14	Aspherical	-5.4226	-5.4226	0.5586
15	Aspherical	3.6029	3.6029	0.4811	5917.606
16	Aspherical	1.2586	1.2586	0.4000

Cylindrical aspheric coefficients:

1. K=-1.1411, A4=9.0e ^-4 , A6=6.37e- ⁵ , A8=2.5772e- ⁶ , A10=-7.20396e ^-7 ;

2. K=-1.6136, A4=1.9e ^-3 , A6=2.00e ^-4 , A8=5.01650e- ⁵ , A10=-6.30190e- ⁶ ;

5. K=-3.8613, A4=-3.0e ^-4 , A6=-1.00e ^-4 , A8=5.6852e- ⁶ ;

Aspheric coefficients:

8. K=-0.3923, A4=8.2e ^-3 , A6=4.00e ^-4 , A8=9.000e ^-4 , A10=-5.400e ^-3 ;

9. K=4.9815, A4=1.87e ^-2 , A6=-5.1e ^-3 , A8=-1.07e ^-2 , A10=3.60e ^-3 ;

11. K=-4.9919, A4=-3.18e ^-2 , A6=5.8e ^-3 , A8=-1.42e ^-2 , A10=1.27e ^-2 ;

12. K=-2.511, A4=4.8448e- ⁵ , A6=1.99e ^-2 , A8=-5.5e ^-3 , A10=7.5e ^-3 ;

13. K=0.8828, A4=-9.1e ^-3 , A6=7.0e ^-4 , A8=-7.0e ^-4 , A10=4.0e ^-4 ;

14. K=1.3393, A4=-4.1e ^-2 , A6=2.69e ^-2 , A8=-1.45e ^-2 , A10=2.8e ^-3 ;

15. K=4.9988, A4=-3.671e ^-1 , A6=1.166e ^-1 , A8=-1.60e ^-2 , A10=-4.90e ^-3 ;

16. K=-4.8512, A4=-1.256e ^-1 , A6=5.34e ^-2 , A8=-1.22e ^-2 , A10=7.0e ^-4 ;

Among them, k is the conic coefficient, A4 is the 4th-order aspherical coefficient, A6 is the 6th-order aspherical coefficient, A8 is the 8th-order aspherical coefficient, and A10 is the 10th-order aspherical coefficient.

3 is a graph of optical distortion of the lens group in the first embodiment; FIG. 4 is a graph of the MTF transfer function (optical transfer function) of the lens group in the first embodiment, which can comprehensively reflect the imaging quality of the system, and the smoother the curve shape, and The higher the height relative to the X-axis, the better the imaging quality of the system and the higher the sharpness of the lens.

Embodiment 2

The difference from the first embodiment is that the positions of the cylindrical lens group and the spherical lens group are interchanged, the spherical lens group composed of four aspherical lenses is used as the front lens group, and the cylindrical lens composed of three cylindrical lenses is used as the front lens group. The lens group is used as the rear lens group; the wide-screen anamorphic lens arranged in this structure, compared with the lens with the structure arrangement in the first embodiment, only lacks the horizontal drawing effect in the captured image.

Obviously, the above-mentioned embodiments are only examples for clear description, and are not intended to limit the implementation manner. For those of ordinary skill in the art, changes or modifications in other different forms can also be made on the basis of the above description. There is no need and cannot be exhaustive of all implementations here. And the obvious changes or changes derived from this are still within the protection scope of the present invention.

Claims (8)

1. A mobile terminal with a built-in anamorphic lens, characterized in that the mobile terminal has a built-in wide-screen anamorphic lens; the mobile terminal comes with an image of the camera software with the deformation coefficient anti-squeeze deformation function and the optical distortion correction function A correction module, the image correction module is configured to perform real-time correction on the images and videos with optical distortion and deformation by the deformation of the anamorphic lens and captured by the wide-screen anamorphic lens built in the mobile terminal.
2. The mobile terminal with a built-in anamorphic lens according to claim 1, wherein the wide-screen anamorphic lens comprises a front lens group, a refractive element, and a rear lens group arranged in sequence; The incident light rays incident on the front lens group are on the optical path and the incident light rays are refracted to the rear lens group; the included angle between the main optical axis of the front lens group and the main optical axis of the rear lens group is less than 180 degrees .
3. The mobile terminal with a built-in anamorphic lens according to claim 2, wherein the main optical axis of the front lens group and the main optical axis of the rear lens group are perpendicular to each other.
4. The mobile terminal with a built-in anamorphic lens according to claim 2, wherein the front lens group is a cylindrical lens group composed of at least three cylindrical lenses; the rear lens group is composed of at least four non- A spherical lens group composed of spherical lenses.
5. The mobile terminal with a built-in anamorphic lens according to claim 4, wherein the cylindrical lens group comprises a first lens, a second lens and a third lens arranged in sequence from the object side to the image side along the optical axis , the first lens and the second lens are cylindrical lenses with negative refractive power, and the third lens is a cylindrical lens with positive refractive power; the spherical lens group includes an optical axis from the object side to the image side The fourth lens, the fifth lens, the sixth lens and the seventh lens are arranged in sequence; the fourth lens, the fifth lens, the sixth lens and the seventh lens are all even-order aspherical lenses.
6. The mobile terminal with a built-in anamorphic lens according to claim 2, wherein the front lens group is a spherical lens group composed of at least four aspherical lenses; the rear lens group is composed of at least three cylindrical lenses Cylindrical lens group consisting of lenses.
7. The mobile terminal with a built-in anamorphic lens according to claim 2, wherein the inflection element is a triangular prism, a plane mirror or a pentaprism.
8. The mobile terminal with a built-in anamorphic lens according to claim 1, wherein the mobile terminal is a mobile phone or a tablet computer.

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