CN113840065A

CN113840065A - Camera module and mobile terminal

Info

Publication number: CN113840065A
Application number: CN202110989265.9A
Authority: CN
Inventors: 傅琦
Original assignee: Realme Mobile Telecommunications Shenzhen Co Ltd
Current assignee: Realme Mobile Telecommunications Shenzhen Co Ltd
Priority date: 2021-08-26
Filing date: 2021-08-26
Publication date: 2021-12-24

Abstract

The embodiment of the application provides a camera module and a mobile terminal, wherein the camera module comprises a first camera, a second camera and an image fusion unit, the first camera comprises a first lens group, a first filtering device and a first image sensor which are sequentially arranged from an object side to an image side, and the first filtering device is used for transmitting near infrared light to the first image sensor; the second camera comprises a second lens group, a second light filtering device and a second image sensor which are arranged in sequence from the object side to the image side, and the second light filtering device is used for transmitting visible light to the second image sensor; the image fusion unit is electrically connected with the first image sensor and the second image sensor and is used for carrying out fusion processing on image signals output by the first image sensor and the second image sensor to obtain a fusion image. The camera module that this application embodiment provided has possessed the sensitization ability to near-infrared light, can realize the defogging formation of image effect, obtains the clear fusion image of picture quality, promotes the image quality of shooing.

Description

Camera module and mobile terminal

Technical Field

The application relates to the technical field of imaging, in particular to a camera module and a mobile terminal.

Background

The camera module of the existing electronic device usually captures the light of a scene through a lens, and realizes efficient red, green and blue three primary colors collection in consideration of imaging quality, and the camera module mostly uses a color filter for removing spectral information of other bands and only retains spectral information of visible bands. This kind of module of making a video recording can satisfy the scenery shooting under the general condition basically, but when meetting weather such as big fog, haze, the tiny particle in the air such as fog, smoke and dust has the effect of blockking to light, makes light reflection and can't pass through, so can only receive the module of making a video recording of visible light can't shoot the scenery behind the smoke and dust fog, and the picture is taken the majority and is covered by cloud to can't shoot the clear image of picture quality.

Disclosure of Invention

An object of the present application is to provide a camera module and a mobile terminal, so as to solve the above problems. The present application achieves the above object by the following technical solutions.

In a first aspect, an embodiment of the present application provides a camera module applied to an electronic device, where the camera module includes a first camera, a second camera, and an image fusion unit, the first camera includes a first lens group, a first filter device, and a first image sensor, which are sequentially disposed from an object side to an image side, and the first filter device is configured to transmit near infrared light to the first image sensor; the second camera comprises a second lens group, a second light filtering device and a second image sensor which are arranged in sequence from the object side to the image side, and the second light filtering device is used for transmitting visible light to the second image sensor; the image fusion unit is electrically connected with the first image sensor and the second image sensor and is used for carrying out fusion processing on image signals output by the first image sensor and the second image sensor to obtain a fusion image.

In a second aspect, an embodiment of the present application provides a mobile terminal, which includes a housing and a camera module, where the camera module is disposed on the housing.

The utility model provides a module of making a video recording can acquire the spectral information of near-infrared light wave band through first camera, acquire the spectral information of visible light wave band through the second camera, then fuse the processing through the image signal of image fusion unit to first image sensor and second image sensor output, make the module of making a video recording possess the sensitization ability to near-infrared light, utilize near-infrared light can pierce through the principle of tiny granule, can realize the defogging formation of image effect, obtain the clear fused image of picture quality, the image quality of promotion shooting.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings used in the description of the embodiments will be briefly introduced below. It is obvious that the drawings in the following description are only some embodiments of the application, and that for a person skilled in the art, other drawings can be derived from them without inventive effort.

Fig. 1 is a schematic cross-sectional view of a camera module according to an embodiment of the present application.

Fig. 2 is a block diagram of a camera module according to an embodiment of the present disclosure.

Fig. 3 is a schematic cross-sectional view of a first image sensor in the camera module according to the embodiment of the present application.

Fig. 4 is a schematic cross-sectional view of a first image sensor in a camera module according to another embodiment of the present disclosure.

Fig. 5 is a schematic cross-sectional view of a first camera in the camera module according to an embodiment of the present application.

Fig. 6 is a schematic structural diagram of a mobile terminal according to an embodiment of the present application.

Detailed Description

Reference will now be made in detail to embodiments of the present application, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the accompanying drawings are illustrative and are only for the purpose of explaining the present application and are not to be construed as limiting the present application.

The camera module of the electronic device usually adopts a color sensor to realize light sensing, the light sensing waveband of the color sensor is 300nm-1000nm, but in order to realize efficient red, green and blue three-primary color acquisition, the camera module of the electronic device such as a mobile terminal mostly uses a color filter cut off by 700nm-1000nm to remove the spectral information of a near infrared waveband (700nm-1000nm), and only retains the spectral information of a visible light waveband (400nm-700 nm). Therefore, when weather such as heavy fog and haze is met, the camera module which can only receive visible light cannot shoot scenery behind smoke and dust fog due to the blocking effect of tiny particles such as fog and smoke dust in the air on light, most of shot pictures are hidden by cloud and fog, and therefore the clear images of the picture quality cannot be shot.

The longer the wavelength, the more diffractive the light, i.e. the more bypassing the barrier. The near infrared light has a longer wavelength, is less influenced by aerosol during transmission, and can pass through tiny particles such as smoke mist with a certain concentration. In view of this, the inventor provides a camera module, which includes a first camera, a second camera and an image fusion unit, and spectral information of a near-infrared light band can be acquired by the first camera, spectral information of a visible light band can be acquired by the second camera, and then image signals output by the first image sensor and the second image sensor are fused by the image fusion unit, so that the camera module has a sensitivity to near-infrared light, and a principle of strong near-infrared fog penetration capability is utilized, so that a defogged imaging effect can be realized, a fused image with clear image quality can be obtained, and image quality in foggy days can be effectively improved.

The camera module can be applied to electronic equipment such as a mobile terminal, a tablet computer, a multimedia player and a display, and the embodiment of the application is not particularly limited herein.

In order to make the technical solutions better understood by those skilled in the art, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. It is to be understood that the embodiments described are only a few embodiments of the present application and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.

Referring to fig. 1 and fig. 2, a camera module 100 according to an embodiment of the present disclosure includes a first camera 110, a second camera 120, and an image fusion unit 130, where the first camera 110 includes a first lens group 111, a first filter 112, and a first image sensor 113 sequentially disposed from an object side to an image side, the first filter 112 is configured to transmit near infrared light to the first image sensor 113, and the first image sensor 113 is configured to generate a near infrared light image according to the near infrared light, so that the camera module 100 can acquire spectral information in a near infrared band.

The second camera 120 includes a second lens group 121, a second filter device 122 and a second image sensor 123, which are sequentially disposed from the object side to the image side, the second filter device 122 is configured to transmit visible light to the second image sensor 123, and the second image sensor 123 is configured to generate a visible light image according to the visible light, so that the camera module 100 can acquire spectral information in the visible light band.

The image fusion unit 130 is electrically connected to the first image sensor 113 and the second image sensor 123, and is configured to perform fusion processing on the image signals output by the first image sensor 113 and the second image sensor 123, that is, perform fusion processing on the near-infrared light image and the visible light image to obtain a fusion image. The image fusion unit 130 may perform fusion processing on the near-infrared light image and the visible light image by using a multi-resolution image fusion method, and may replace the blurred and foggy portion with the near-infrared light image on the premise of maximally retaining the clear portion of the visible light image, thereby obtaining a clear image conforming to the visual characteristics of human eyes.

The camera module 100 provided by the embodiment of the application has the photosensitive capacity for near-infrared light through the first camera 110, and by utilizing the characteristics of strong near-infrared light fog penetration capacity and good color brightness of visible light images, after the complementary information of the near-infrared light images and the visible light images is integrated through the image fusion unit 130, the defogging imaging effect can be realized, the fusion images with clear image quality can be obtained, and the image quality in foggy days can be effectively improved.

In some embodiments, the first filter 112 is configured to transmit light with a wavelength in a range from 700nm to 1100nm, and the wavelength range is wide, so that the light transmittance can be improved, and the imaging quality of the first camera 110 in a low-brightness environment can be ensured.

In this embodiment, the first filter 112 may be configured to pass only light with a wavelength in a range from 700nm to 1100nm, and absorb or reflect light with a wavelength in a range from 400nm to 700nm, which is equivalent to removing the influence of visible light for the first image sensor 113, and only retaining illumination information in a near-infrared band, so as to avoid interference with the first image sensor 113.

Illustratively, the first filter 112 may be a color filter, such as an absorption filter for transmitting light having a wavelength in the range of 700nm to 1100nm and absorbing light having a wavelength in the range of 400nm to 700 nm; or a reflective color filter for transmitting light having a wavelength in the range of 700nm to 1100nm and reflecting light having a wavelength in the range of 400nm to 700 nm. In some embodiments, the first filter device 112 may also be a filter, such as a PET (polyester resin) filter, a PE (polyethylene) filter, etc., and the filter can be directly plated on the image side surface of the first lens group 111, so as to reduce the size of the space occupied by the first filter device 112, and further reduce the volume of the first camera 110.

The second filter 122 may be configured to transmit light having a wavelength in the range of 400nm to 700 nm. Illustratively, the second filtering means 122 may be a color filter for transmitting light having a wavelength in the range of 400nm to 700 nm. The second filter 122 may be configured to transmit only light with a wavelength in a range of 400nm to 700nm, so as to avoid interference of light in other bands, which may cause color cast in the visible light image.

In some embodiments, the first filter 112 is configured to transmit light with a wavelength in a range from 800nm to 1100nm, and the wavelength range is narrowed, so that the effectiveness of the illumination information in the near-infrared band can be improved, the illumination information in the near-infrared band can be enhanced in a low-light environment, and the application to some color matching algorithms, such as green background color loss correction, is convenient. The first filter 112 may be configured to transmit light with a wavelength in a range of 800nm to 1100nm, that is, the first filter 112 is configured to transmit only light with a wavelength in a range of 800nm to 1100 nm.

In some embodiments, the first filter device 112 is configured to transmit light with a wavelength in a range from 700nm to 800nm, and the wavelength range is narrow, so that pure near-red light information compensation can be obtained, and the first filter device can be used in conjunction with the second camera 120 to perform dark-state ambient light source detection, so that the weak light detection capability is provided, and further, the influence of stripes and artifacts caused by the flicker generated by the light source in the pictures and videos is eliminated. The first filter 112 may be configured to transmit light with a wavelength in a range of 700nm to 800nm, where the first filter 112 is configured to transmit only light with a wavelength in a range of 700nm to 800 nm.

In this embodiment, the first camera 110 further includes a first lens seat 114, the first lens seat 114 is substantially cylindrical, and the first lens group 111 and the first filter device 112 are fixedly mounted in the first lens seat 114. The second camera 120 may further include a second lens holder 124, the second lens holder 124 is substantially cylindrical, and the second lens group 121 and the second filter 122 are fixedly mounted in the second lens holder 124. The first lens mount 114 and the second lens mount 124 can be connected to each other to improve the structural stability of the camera module 100.

The camera module 100 may further include a substrate 140, wherein the first image sensor 113 and the second image sensor 123 are attached to the substrate 140, and the first lens holder 114 and the second lens holder 123 are covered on the substrate 140. The image fusion unit 130 is electrically connected to the first image sensor 113 and the second image sensor 123 through the substrate 140. The substrate 140 may be a ceramic circuit board or an aluminum circuit board. In some embodiments, the substrate 140 may also be a flexible circuit board.

The image fusion unit 130 may be a processing chip integrated on the substrate 140 to improve the integrity of the camera module 100. In some embodiments, the image fusion unit 130 may also be independent of the substrate 140.

In this embodiment, the first image sensor 113 and the second image sensor 123 are both CMOS image sensor chips produced by using a standard CMOS (Complementary Metal Oxide Semiconductor) technology. The CMOS image sensor chip can integrate the image acquisition unit and the signal processing unit on the same chip, and has the advantages of small size, low power consumption, high processing speed and the like.

In some embodiments, the first image sensor 113 is a color sensor (RGB sensor), and the second image sensor 123 is also a color sensor (RGB sensor), that is, the first camera 110 and the second camera 120 both use a color sensor as a photosensitive structure, so that the first camera 110 and the second camera 120 can form a near-infrared light image and a visible light image with close brightness, thereby facilitating image fusion.

In this embodiment, the color sensor is made of a silicon-based semiconductor material, and a photosensitive waveband of the silicon-based semiconductor material is 300nm to 1000nm, which encompasses a visible light waveband and a near-infrared light waveband, so that the first camera 110 can recognize near-infrared light through the color sensor, and the second camera 120 can recognize visible light through the color sensor. As an example, the color sensor is of type OV5675, has a pixel size of 1.12 micrometers, and can be applied to electronic devices such as mobile phones with strict requirements on volume and size.

In some embodiments, the first image sensor 113 is a black and white sensor (MONO sensor) and the second image sensor 123 is a color sensor (RGB sensor). The black-and-white sensor is made of a silicon-based semiconductor material, and can be used for realizing light sensitivity in a full-wave band (430nm-1100nm), so that the first camera 110 can also be used for sensing near infrared light through the black-and-white sensor. Compared with a color sensor, the black-and-white sensor has higher quantum efficiency, the black-and-white sensor removes a Bayer Color Filter Array (CFA), although colors cannot be distinguished, all light can be incident, so that a larger light incoming amount can be obtained compared with the color sensor with the Bayer color filter array, the sensitivity of the sensor is also higher, a near infrared light image obtained through the black-and-white sensor is brighter, detail information can be better reserved, and further, the details of the fused image are clearer, the image quality is better, and especially in a dark light environment.

Referring to fig. 3, the black-and-white sensor may include a microlens layer 1131, a transparent layer 1132, a photosensitive layer 1133, and a metal layer 1134 stacked in sequence from an object side to an image side. The microlens layer 1131 may include a plurality of microlenses arranged in an array, and is configured to refract incident light at different incident angles to form incident light that vertically enters the light transmissive layer 1132. The transparent layer 1132 may be a layer of a hollow bayer color filter array generated without a filling dye, and can transmit all near infrared light incident through the microlens layer 1131, and compared to a color sensor with a bayer color filter array, the black and white sensor is equivalent to saving one step in process, and reduces the use of a filling dye, so that the cost of the black and white sensor is lower. The photosensitive layer 1133 may be a Photodiode (PD) made of a silicon-based semiconductor material, such as a PN junction photodiode, a PIN intrinsic semiconductor Diode, or a metal-semiconductor contact photodiode, for performing photoelectric conversion on incident light. The metal layer 1134 is a metal circuit layer, and is used to transmit the electrical signal obtained by photoelectric conversion of the photosensitive layer 1133 to a peripheral circuit for processing.

Since the absorption coefficient of the silicon material to the near infrared light is very low, that is, the absorption coefficient of the photosensitive layer 1133 to the near infrared light is very low, the thickness of the photosensitive layer 1133 may be set to be greater than 4mm to deepen the thickness of the photosensitive layer 1133, increase the optical path of the near infrared light in the photosensitive layer 1133, so that the near infrared light can be fully absorbed, prevent the near infrared light from directly irradiating the metal layer 1134 to generate reflection to affect imaging, and reduce noise interference. Specifically, the photosensitive layer 1133 may have a thickness of 4mm, 4.3mm, 4.5mm, or 4.8 mm.

Referring to fig. 4, in some embodiments, the photosensitive layer 1133 has a plurality of grooves 1135 on a surface thereof facing the transparent layer 1132, and the near infrared light incident through the transparent layer 1132 can be reflected on the surfaces of the grooves 1135, so as to further increase the optical path of the near infrared light in the photosensitive layer 1133.

In this embodiment, the grooves 1135 may be an inverted cone-shaped concave structure, an inverted triangular pyramid-shaped concave structure, an inverted quadrangular pyramid-shaped concave structure, or the like, and the notch edges of each groove 1135 may be connected to each other, so that the cross sections of the plurality of grooves 1135 in the thickness direction of the photosensitive layer 1133 can be combined to form a zigzag structure.

In some embodiments, a reflective layer (not shown) is further disposed between the photosensitive layer 1133 and the metal layer 1134 to reflect incident light at the bottom of the photosensitive layer 1133, further increasing the optical path length of near infrared light transmitted in the photosensitive layer 1133. As an example, the reflective layer is a nano-silver layer such that the reflective layer has a reflectivity of up to 98%.

Referring to fig. 5, in some embodiments, the first lens group 111 includes a first lens 1111, a second lens 1112, a third lens 1113 and a fourth lens 1114, and the first lens 1111, the second lens 1112, the third lens 1113 and the fourth lens 1114 are sequentially arranged from an object side to an image side. Compared with the conventional infrared camera module, the number of the first lens group 111 is increased to four, so that the first lens group 111 has more allowance for optical correction, thereby enhancing the resolution and contrast of the lens.

Further, after the surface shape is optimized for the near infrared band (700nm-1100nm), for example, the first lens 1111, the second lens 1112, the third lens 1113 and the fourth lens 1114 include at least one convex mirror with biconvex surface and at least one concave mirror with concave surface and plane surface, so that the MTF (modulation transfer function) response of the first lens group 111 in the near infrared band is improved by 20%, and the resolving power is excellent.

As an example, the object-side surface of the first lens 1111 is a convex surface, and the image-side surface of the first lens 1111 is a flat surface. The object-side surface of the second lens 1112 is concave, and the image-side surface of the second lens 1112 is flat. The object-side surface of the third lens element 1113 is concave, and the image-side surface of the third lens element 1113 is convex. The object-side surface and the image-side surface of the fourth lens 1114 are convex. The lens materials of the first lens 1111, the second lens 1112, the third lens 1113 and the fourth lens 1114 may be plastic or glass, and the lens assembly cost may be reduced when a plastic material is used.

In this embodiment, one or more of the first lens 1111, the second lens 1112, the third lens 1113, and the fourth lens 1114 is/are coated with a near-infrared optical antireflection film, and the antireflection wavelength band of the antireflection film is 700nm to 1100nm, so as to facilitate transmission of infrared light. As an example, the object side surfaces of the third lens 1113 and the fourth lens 1114 are coated with infrared antireflection coatings.

In this embodiment, the second lens group 121 may also be formed by combining a plurality of lenses, and two or more of the lenses may be glued together to correct chromatic aberration by using the lens gluing method, thereby improving the imaging effect. Illustratively, the second lens group 121 may be composed of 4 plastic lenses, or 4 plastic lenses and 1 glass lens. As for the lens structure of the second lens group 121, the conventional camera module 100 can be referred to, and is not limited in detail herein.

In some embodiments, the focal number (F/NO) of the first lens group 111 is less than or equal to 2.2, and the light incident amount and the depth of field of the first camera 110 are more balanced, so as to increase the visible distance and the light incident amount of the first camera 110, thereby increasing the signal-to-noise ratio (SNR) of the camera module 100.

In some embodiments, the field angle (FOV) of the first lens group 111 is equal to 88 °, the field angle of the second lens group 121 is equal to 85 °, and the inter-axial distance (baseline) between the first lens group 111 and the second lens group 121 is less than 25mm, i.e., the inter-center distance between the first lens group 111 and the second lens group 121 is less than 25 mm. Therefore, the field angle of the first lens group 111 can be matched with that of the second lens group 121, so that the near-infrared light image and the visible light image can be completely matched when being fused, and the details of the near-infrared light image can be correspondingly fused to the correct position of the visible light image.

In this embodiment, the optical axes of the first lens group 111 and the second lens group 121 are parallel to each other, the centers of the first optical filter device 112 and the first image sensor 113 are located on the optical axis of the first lens group 111, and the centers of the second optical filter device 122 and the second image sensor 123 are located on the optical axis of the second lens group 121.

Referring to fig. 1 and fig. 6, an embodiment of the present invention further provides a mobile terminal 200, which includes a housing 210 and a camera module 100, wherein the camera module 100 is disposed on the housing 210.

The mobile terminal 200 provided in the embodiment of the present application can acquire spectral information of a near-infrared light band through the first camera 110, can acquire spectral information of a visible light band through the second camera 120, and then performs fusion processing on image signals output by the first image sensor 113 and the second image sensor 123 through the image fusion unit 130 (see fig. 2 in detail), so that the camera module 100 has a photosensitivity to near-infrared light, and can implement a defogging imaging effect by using a principle of strong near-infrared defogging ability, obtain a fused image with clear image quality, and effectively improve image quality in foggy days.

In this embodiment, the housing 210 may include a front panel (not shown in the view angle of the figure), a rear cover 211, a middle frame 212 and a lens mounting plate 213, the front panel and the rear cover 211 are disposed opposite to each other, and the middle frame 212 is connected between the front panel and the rear cover 211 to form a complete structure of the housing 210 of the mobile terminal 200. The lens mounting plate 213 is mounted on the rear cover 211, the lens mounting plate 213 is provided with a first lens hole and a second lens hole, the first camera 110 is mounted in the first lens hole, and the second camera 120 is mounted in the second lens hole, so that the camera module 100 can be mounted on the rear cover 211 to be used as a rear camera of the mobile terminal 200.

The back cover 211 is substantially a rectangular plate-shaped structure, and the first cameras 110 and the second cameras 120 may be arranged at intervals along a length direction of the back cover 211, may be arranged at intervals along a width direction of the back cover 211, or may be arranged at intervals along a diagonal direction of the back cover 211, which is not particularly limited herein.

In this embodiment, the mobile terminal 200 may further include a processor, which may include one or more processing cores, which connects various parts throughout the mobile terminal 200 using various interfaces and lines, and performs various functions of the mobile terminal 200 and processes data by executing or executing instructions, programs, code sets, or instruction sets stored in the memory, and calling data stored in the memory. The image fusion unit 130 may be integrated into the processor, and it is understood that the image fusion unit 130 may not be integrated into the processor, but may be implemented by a single image processing chip.

For detailed structural features of the camera module 100, refer to the related description of the above embodiments. Since the mobile terminal 200 includes the camera module 100 in the above embodiment, all the advantages of the camera module 100 are provided, and are not described herein again.

The above-mentioned embodiments only express several embodiments of the present application, and the description thereof is more specific and detailed, but not construed as limiting the scope of the present application. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the concept of the present application, which falls within the scope of protection of the present application. Therefore, the protection scope of the present patent shall be subject to the appended claims.

Claims

1. The utility model provides a module of making a video recording, is applied to electronic equipment, its characterized in that includes:

the first camera comprises a first lens group, a first light filtering device and a first image sensor which are arranged in sequence from an object side to an image side, wherein the first light filtering device is used for transmitting near infrared light to the first image sensor;

the second camera comprises a second lens group, a second light filtering device and a second image sensor which are arranged in sequence from the object side to the image side, and the second light filtering device is used for transmitting visible light to the second image sensor; and

and the image fusion unit is electrically connected with the first image sensor and the second image sensor and is used for carrying out fusion processing on the image signals output by the first image sensor and the second image sensor to obtain a fusion image.

2. The camera module of claim 1, wherein the first filter is configured to transmit light having a wavelength in a range of 700nm to 1100nm, and the second filter is configured to transmit light having a wavelength in a range of 400nm to 700 nm.

3. The camera module of claim 1, wherein the first filter is configured to transmit light having a wavelength in a range of 800nm to 1100 nm.

4. The camera module of claim 1, wherein the first filter is configured to transmit light having a wavelength in a range of 700nm to 800 nm.

5. The camera module of claim 1, wherein the first image sensor is a color sensor and the second image sensor is a color sensor.

6. The camera module of claim 1, wherein the first image sensor is a black and white sensor and the second image sensor is a color sensor.

7. The camera module according to claim 6, wherein the black-and-white sensor comprises a microlens layer, a light-transmitting layer, a photosensitive layer and a metal layer which are sequentially stacked, and the thickness of the photosensitive layer is greater than 4 mm.

8. The camera module according to claim 6, wherein a plurality of grooves are formed on a surface of the photosensitive layer facing the light transmissive layer, and the near-infrared light incident through the light transmissive layer can be reflected on the surfaces of the grooves.

9. The image capturing module of claim 1, wherein the first lens group comprises a first lens element, a second lens element, a third lens element and a fourth lens element, the first lens element, the second lens element, the third lens element and the fourth lens element are sequentially disposed from an object side to an image side.

10. The camera module of claim 1, wherein the first lens group has a focal number of 2.2 or less.

11. The camera module of claim 1, wherein the first lens group has a field angle equal to 88 °, the second lens group has a field angle equal to 85 °, and the first lens group is spaced from the second lens group by less than 25 mm.

12. A mobile terminal, comprising a housing and the camera module according to any one of claims 1-11, wherein the camera module is disposed on the housing.