CN216649776U

CN216649776U - Camera module and electronic equipment

Info

Publication number: CN216649776U
Application number: CN202122723918.7U
Authority: CN
Inventors: 成纯森; 雷闯; 李立业; 户磊
Original assignee: Hefei Dilusense Technology Co Ltd
Current assignee: Hefei Dilusense Technology Co Ltd
Priority date: 2021-11-08
Filing date: 2021-11-08
Publication date: 2022-05-31
Anticipated expiration: 2031-11-08

Abstract

The embodiment of the application relates to the technical field of electronic products, and discloses a camera module and electronic equipment, wherein the camera module includes camera lens, light filter and photosensitive element that set gradually along light incident direction to and be used for the holder of fixed light filter, the light filter includes relative first surface and the second surface that sets up, the first surface of light filter sets up towards photosensitive element, the second surface setting of light filter is on the holder is towards photosensitive element's surface. The camera module and the electronic equipment provided by the embodiment of the application can improve the ghost phenomenon of the camera module when shooting images.

Description

Camera module and electronic equipment

Technical Field

The embodiment of the application relates to the technical field of electronic products, in particular to a camera module and electronic equipment.

Background

Along with the rapid development of electronic products, the user also continuously improves the requirements for the shooting quality of the shooting module in the electronic products. In the camera module, a ghost image, also called glare (flare), appearing in the image is always a key factor affecting the camera quality of the camera module.

The ghost image appearing in the imaging is generally an interference pixel appearing on the image, and for example, when the image is shot in a point light source or a strong illumination environment, a relatively obvious petal-shaped ghost image easily appears near the light source of the image, and the ghost image usually forms a strong contrast effect with the surrounding image, which has a relatively large influence on the overall quality of the image. Therefore, how to improve the ghost phenomenon appearing on the image when the image pickup module shoots the image is an urgent problem to be solved.

SUMMERY OF THE UTILITY MODEL

An object of the embodiments of the present application is to provide a camera module and an electronic device, which can improve a ghost phenomenon occurring on an image when the camera module takes the image.

The embodiment of the application provides a camera module, including camera lens, light filter and the photosensitive element that sets gradually along light incidence direction to and be used for the support of fixed light filter, the light filter includes relative first surface and the second surface that sets up, and the first surface of light filter sets up towards photosensitive element, and the second surface setting of light filter is on the support is towards photosensitive element's surface.

The embodiment of the application also provides electronic equipment which comprises the camera module in the embodiment.

The embodiment of the application provides a camera module and electronic equipment, through with the second surface setting of light filter on the one side of supporter orientation photosensitive element, rather than set up the first surface of light filter on the supporter, can make the light filter in the camera module form flip-chip structure, and when the light filter possesses flip-chip structure, can be behind the attenuate light filter, reach the purpose that increases the reflection distance between light filter and the photosensitive element, make the light through light filter surface reflection be difficult to focus on photosensitive element's photosensitive area, improve the camera module when shooing the image, the ghost phenomenon that appears on the image.

In addition, the thickness of the optical filter is 0.2 mm to 3.0 mm.

In addition, the camera module further comprises a lens base, the lens and the photosensitive element are fixed on the lens base, and the optical filter is fixed on the lens base through the supporting piece. Thus, the lens and the photosensitive element can be respectively fixed by the lens base, and the optical filter can be fixed on the lens base through the supporting piece.

In addition, the lens base comprises a fixing part protruding towards the central axis of the optical filter, and the supporting piece is arranged on the surface of the fixing part facing the photosensitive element. Therefore, the difficulty of fixing the optical filter on the lens base through the supporting piece is reduced, and in practical application, the reflection distance between the optical filter and the photosensitive element can be increased by reducing the thickness of the fixing part.

In addition, a projection area of the fixing portion in the optical axis direction is located outside an inner contour of a projection area of the support member in the optical axis direction. Therefore, the fixing part of the lens base can not shield the light incident on the optical filter.

In addition, the inner wall of the lens seat close to one side of the lens is arranged in a step shape, and the distance between the inner wall and the central axis of the optical filter is reduced along the reverse direction of the incident direction of light rays. Therefore, the inner wall of the lens seat close to one side of the lens can present a contraction trend along the reverse direction of the light incidence direction, and the lens seat can shield stray light incident to the lens.

In addition, the support piece is including being annular spacing portion and certainly the inward flange of spacing portion to the protruding bulge of establishing of center pin of light filter, spacing portion is kept away from one side of photosensitive element is fixed on the microscope base, the light filter the first surface is pasted on the bulge, just the lateral wall of light filter with the inward flange butt of spacing portion. Thus, the filter can be firmly fixed on the support.

In addition, the orthographic projection of the optical filter on the photosensitive element is positioned within the photosensitive area of the photosensitive element. Therefore, the probability of reflecting light from the surface of the photosensitive element to the surface of the optical filter is reduced.

In addition, the photosensitive element includes a microlens array disposed toward the first surface. Thus, the photosensitive element can be focused by arranging the micro lens array, so that light loss is prevented, and the sensitivity is increased.

Drawings

One or more embodiments are illustrated by way of example in the accompanying drawings, which correspond to the figures in which like reference numerals refer to similar elements and which are not to scale unless otherwise specified.

Fig. 1 is a ray route diagram of a camera module provided in an embodiment of the present application;

FIG. 2 is a schematic diagram of light reflected between a filter and a photosensitive element according to an embodiment of the present disclosure;

fig. 3 is an image effect diagram of the camera module provided in the embodiment of the present application, which is taken under light sources with different incident angles;

fig. 4 is a schematic structural diagram of a camera module provided in the embodiment of the present application;

fig. 5 is a schematic structural diagram of the camera module after the optical filter is thinned according to the embodiment of the present application;

fig. 6 is a schematic structural view of the camera module after the fixing portion is thinned according to the embodiment of the present application;

fig. 7 is a schematic diagram of an image effect of the camera module provided in the embodiment of the present application, which is shot at different reflection distances.

Detailed Description

Embodiments of the present invention will be described in detail below with reference to the accompanying drawings. The following examples are merely used to more clearly illustrate the technical solutions of the present application, and therefore are only examples, and the protection scope of the present application is not limited thereby.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs; the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application; the terms "including" and "having," and any variations thereof, in the description and claims of this application and the description of the above figures are intended to cover non-exclusive inclusions.

The ghost phenomenon can appear so of module of making a video recording when formation of image, mainly because light is after getting into the module of making a video recording, can appear multiple reflection on each part of the module of making a video recording, and the partial light after the reflection can reach the photosensitive element of the module of making a video recording, finally leads to photosensitive element to appear the ghost when formation of image.

As shown in fig. 1, the core components of the camera module include three parts, which are a light-sensing element 30 for receiving light rays for imaging, a light filter 20 for filtering the light rays received by the light-sensing element 30, and a lens 10 for converging the light rays, wherein when the camera module takes an image, the light rays shown by arrows in fig. 1 pass through the lens 10 and the light filter 20 in sequence, and finally reach the light-sensing element 30.

The lens 10 of the camera module focuses ambient light to form a sharp image.

The optical filter 20 of the camera module is mainly an infrared cut-off optical filter, and an absorption layer with absorption effect on infrared band light is coated on the glass substrate, so that the absorption characteristic on the infrared band light is improved, and the optical filter 20 has good filtering effect to enable the imaging effect of the camera module to be close to the imaging effect of human eyes.

The photosensitive element 30 of the camera module is widely used as an imaging component of the camera module, and one of the two types is a CCD (Charge Coupled Device) image sensor, and the other type is a CMOS (Complementary Metal-Oxide-Semiconductor) image sensor. Both of them can convert light into electric charges, and when the surface of the photosensitive element 30 is irradiated by light, each photosensitive unit will reflect the electric charges on the component, and when the signals generated by all the photosensitive units are added together, a complete picture is formed. After the photosensitive element 30 of the camera module is connected to the circuit board, the data of the image can be sent to the electronic device for the user to view.

The applicant has noticed that in the practical application of the camera module, as shown in fig. 2, there is a secondary reflection between the filter 20 and the photosensitive element 30, that is, the light filtered by the filter 20 and reaching the photosensitive element 30 is reflected to the filter 20 and then reflected to the surface of the photosensitive element 30 again, and the light after the secondary reflection may also be reflected more times and finally reach the surface of the photosensitive element 30, and the multiple reflection of the light causes a petal-shaped ghost of the image, which is especially serious when the strong light is incident, as shown in the image effect captured in the figure.

In addition, fig. 3 shows the image effect of the camera module when the camera module takes images of light sources with different incident angles (5 degrees, 10 degrees, 15 degrees and 20 degrees, respectively) under the darkroom real shooting condition, and it can be seen that such petal-shaped ghosts will appear more obviously near the periphery of the point-shaped light sources, and form a strong contrast effect with the point-shaped light sources and the surrounding dark images, wherein the dotted ellipse shown in the image only identifies part of the ghosting phenomenon.

In order to improve the petal-shaped ghost image of the image pickup module during imaging, the applicant finds that the ghost image phenomenon of the image pickup module during image pickup can be improved by increasing the distance between the filter 20 and the photosensitive element 30, namely, increasing the reflection distance G between the filter 20 and the photosensitive element 30. Specifically, in the camera module, the distance between the surface of the filter 20 on the light exit side and the surface of the photosensitive element 30 is increased.

If the reflection distance G between the filter 20 and the photosensitive element 30 is to be increased in the camera module, the filter 20 may be fixed in a flip-chip manner, i.e., the surface of the filter 20 on the light incident side is used as the fixing surface of the filter 20, and the surface of the filter 20 on the light emergent side is not used as the fixing surface of the filter 20. Thus, after the filter 20 is thinned, the distance between the surface of the filter 20 on the light emitting side and the surface of the photosensitive element 30 in the camera module is increased, and the reflection distance G of the light between the filter 20 and the photosensitive element 30 is increased.

The light incident side of the filter 20 refers to the side of the filter 20 that receives light, i.e., the side facing the lens 10, and the light emitting side of the filter 20 refers to the side of the filter 20 that emits light, i.e., the side facing the light receiving element 30.

After the reflection distance G between the optical filter 20 and the photosensitive element 30 is increased in the camera module, the reflection light rays with the same angle can reach the surface of the optical filter 20 only after passing through the longer reflection distance G, and compared with the camera module before the reflection distance G is increased, the position where the light rays finally reach the surface of the optical filter 20 can be shifted, and the position where the light rays reach the surface of the optical filter 20 can be shifted, so that the path of each time of reflection after the light rays is shifted, and finally, the light rays reflected by the surface of the optical filter 20 are not easily focused in the photosensitive area of the photosensitive element 30 and fall outside the photosensitive area. Therefore, the ghost phenomenon of the image when the image pickup module shoots the image can be better improved.

As shown in fig. 4, the image pickup module according to the embodiment of the present application includes a lens 10, an optical filter 20, a photosensitive element 30, and a support 40 for fixing the optical filter 20, the optical filter 20 includes a first surface 21 and a second surface 22 which are oppositely disposed, the first surface 21 is disposed toward the photosensitive element 30, and the second surface 22 is disposed on a surface of the support 40 facing the photosensitive element 30.

The first surface 21 of the filter 20 disposed toward the light sensing element 30, i.e., the surface of the filter 20 on the light emitting side, and the second surface 22 of the filter 20 is opposite to the first surface 21, i.e., the surface of the filter 20 on the light incident side.

The second surface 22 of the optical filter 20 is disposed on the surface of the support member 40 facing the photosensitive element 30, so that the optical filter 20 in the camera module forms an inverted structure, and when the optical filter 20 has the inverted structure, the purpose of increasing the reflection distance G between the optical filter 20 and the photosensitive element 30 can be achieved after the optical filter 20 is thinned, compared with the case that the light reflected by the surface of the optical filter 20 is not easily focused in the photosensitive area of the photosensitive element 30, the ghost phenomenon occurring on the image when the camera module takes the image is improved.

In some embodiments, the thickness L of the optical filter 20 is optionally 0.2 mm to 3.0 mm.

The purpose of increasing the reflection distance G between the filter 20 and the photosensitive element 30 can be achieved by reducing the thickness of the filter 20, and fig. 5 shows the structure of the camera module after the thickness L of the filter is reduced to L1 (smaller than L), for example, in practical application, when the thickness of the filter 20 is reduced from 0.30 mm to 0.21 mm, the reflection distance G between the filter 20 and the photosensitive element 30 is correspondingly increased by 0.09 mm.

In some embodiments, the camera module further includes a lens holder 50, the lens 10 and the photosensitive element 30 are fixed on the lens holder 50, and the optical filter 20 is fixed on the lens holder 50 via the supporting member 40.

The lens holder 50 is a base for fixing each component in the camera module, the lens 10 and the photosensitive element 30 can be fixed through the lens holder 50, the lens 10 is fixed at one end of the lens holder 50, the photosensitive element 30 is fixed at the other end of the lens holder 50, and the optical filter 20 is fixed on the lens holder 50 through the supporting member 40.

In some embodiments, optionally, the lens holder 50 includes a fixing portion 51 protruding toward the central axis of the filter 20, and the support 40 is disposed on a surface of the fixing portion 51 facing the photosensitive element 30.

The fixing portion 51 projected toward the central axis of the optical filter 20 in the lens holder 50 means a portion projected toward the central axis of the optical filter 20 on the wall surface inside the lens holder 50, and the central axis of the optical filter 20 means the symmetry axis of the optical filter 20.

By providing the fixing portion 51 protruding toward the central axis of the optical filter 20 on the lens holder 50, the fixing of the support 40 on the lens holder 50 is facilitated, and the reflecting distance G between the optical filter 20 and the photosensitive element 30 can be increased by reducing the thickness D of the fixing portion 51. When the support 40 is fixed on the mirror base 50, the support 40 can be fixed on the surface of the fixing portion 51 of the mirror base 50 facing the photosensitive element 30 without matching the outer edge of the support 40 with the inner edge of the mirror base 50, thereby reducing the difficulty in fixing the filter 20 on the mirror base 50 via the support 40.

In practical applications, the reflection distance G between the filter 20 and the photosensitive element 30 can be increased by reducing the thickness D of the fixing portion 51, that is, reducing the portion of the fixing portion 51 close to the photosensitive element 30, and fig. 6 shows the configuration of the imaging module in which the thickness D of the fixing portion 51 of the lens holder 50 is reduced to D1 (smaller than D). As in practical applications, when the thickness D of the fixing portion 51 is reduced by 0.2 mm, the reflection distance G between the filter 20 and the photosensitive element 30 is increased by 0.2 mm accordingly.

In some embodiments, optionally, a projection area of the fixing portion 51 in the optical axis direction is located outside an inner contour of a projection area of the support member 40 in the optical axis direction.

The optical axis direction refers to the direction of the symmetry axis of the camera module, the projection area of the fixing portion 51 in the optical axis direction, i.e., the projection area of the fixing portion 51 in the thickness direction, and the projection area of the support 40 in the optical axis direction, i.e., the projection area of the support 40 in the thickness direction.

By making the projection area of the fixing portion 51 in the optical axis direction outside the inner contour of the projection area of the support 40 in the optical axis direction, the fixing portion 51 of the lens holder 50 can prevent the light incident on the optical filter 20 from being blocked.

In some embodiments, optionally, the inner wall of the lens holder 50 near the side of the lens 10 is stepped, and the distance from the central axis of the filter 20 decreases in the direction opposite to the light incidence direction X.

The inner wall of the lens holder 50 close to the lens 10, that is, the inner wall of the lens holder 50 close to the light incident side, the stepped arrangement means that the inner wall of the lens 10 is in a step shape, and the distance between the inner wall of the lens holder 50 close to the lens 10 and the central axis of the optical filter 20 decreases along the direction opposite to the light incident direction X, that is, the inner wall of the lens holder 50 close to the lens 10 presents a contraction trend along the direction opposite to the light incident direction X.

By making the inner wall of the lens mount 50 close to the side of the lens 10 appear a contraction trend in the opposite direction of the light incidence direction X, the lens mount 50 can shield stray light incident on the lens 10.

In some embodiments, optionally, the supporting member 40 includes a ring-shaped limiting portion 41 and a protruding portion 42 protruding from an inner edge of the limiting portion 41 toward a central axis of the optical filter 20, a side of the limiting portion 41 away from the photosensitive element 30 is fixed on the lens holder 50, the first surface 21 of the optical filter 20 is adhered on the protruding portion 42, and a side wall of the optical filter 20 abuts against the inner edge of the limiting portion 41.

The annular limiting portion 41 is a hollow portion in the middle of the limiting portion 41, and the protrusion 42 is a portion of the inner edge of the limiting portion 41 protruding toward the central axis of the filter 20.

By providing the annular stopper 41 and the protrusion 42 protruding from the inner edge of the stopper 41 in the support 40, the first surface 21 of the filter 20 can be adhered to the protrusion 42, and the side wall of the filter 20 can be brought into contact with the inner edge of the stopper 41, so that the contact area between the filter 20 and the support 40 when the filter 20 is fixed to the support 40 is increased, and the filter 20 can be more stably fixed to the support 40.

In some embodiments, optionally, the orthographic projection of the filter 20 on the light-sensing element 30 is located within the light-sensing area of the light-sensing element 30.

The light sensing area of the light sensing element 30 refers to an area where the surface of the light sensing element 30 can receive light for imaging, and by making the orthographic projection of the light filter 20 on the light sensing element 30 within the light sensing area of the light sensing element 30, the probability that the light is reflected from the surface of the light sensing element 30 to the surface of the light filter 20 can be reduced.

In some embodiments, the photosensitive element 30 optionally includes a microlens array 31, the microlens array 31 being disposed toward the first surface 21.

The microlens array 31 is an array composed of sub-lenses having a diameter of several hundreds nanometers to several millimeters, and the light sensing devices (e.g., photodiodes) of the light sensing element 30 can be focused by disposing the microlens array 31 to prevent light loss and increase sensitivity.

When the image capturing module provided in the embodiment of the present application actually captures an image, as shown in fig. 7, when the image capturing module is at the same incident angle (5 degrees, 10 degrees, 15 degrees, or 20 degrees), with the increase of the reflection distance G between the optical filter 20 and the photosensitive element 30, it can be seen that the ghost phenomenon around the light source in the captured image is improved, and the brightness of the ghost is reduced. In fig. 7, the effect of the captured image is shown in the case where the reflection distance G is equal to 0.27 mm, 0.36 mm, and 0.516 mm, and the dotted ellipse shown in the image also indicates a portion of the ghost phenomenon.

The embodiment of the present application further provides an electronic device, including the camera module in the above embodiment, through making the optical filter 20 in the camera module form the flip structure, can reach the purpose of increasing the reflection distance G between the optical filter 20 and the photosensitive element 30 after thinning the optical filter 20, thereby making the light reflected by the surface of the optical filter 20 not easy to focus on the photosensitive area of the photosensitive element 30, and improving the ghost phenomenon that appears on the image when the camera module shoots the image.

The electronic device provided by the embodiment of the application can be but not limited to mobile phones, tablets, computers, smart watches and other imaging-supporting electronic products.

Finally, it should be noted that: the above embodiments are only used for illustrating the technical solutions of the present application, and not for limiting the same; although the present application has been described in detail with reference to the foregoing embodiments, it should be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; such modifications and substitutions do not depart from the spirit and scope of the present disclosure, and the present disclosure should be construed as being covered by the claims and the specification. In particular, the technical features mentioned in the embodiments can be combined in any way as long as there is no structural conflict. The present application is not intended to be limited to the particular embodiments disclosed herein but is to cover all embodiments that may fall within the scope of the appended claims.

Claims

1. The utility model provides a module of making a video recording which characterized in that includes:

the optical filter comprises a first surface and a second surface which are oppositely arranged, the first surface faces the photosensitive element, and the second surface is arranged on the surface of the photosensitive element.

2. The camera module of claim 1, wherein:

the thickness of the optical filter is 0.2 mm to 3.0 mm.

3. The camera module of claim 1 or 2, wherein:

the lens and the photosensitive element are fixed on the lens base, and the optical filter is fixed on the lens base through the supporting piece.

4. The camera module of claim 3, wherein:

the lens base comprises a fixing part protruding towards the central axis of the optical filter, and the supporting piece is arranged on the surface of the fixing part facing the photosensitive element.

5. The camera module of claim 4, wherein:

the projection area of the fixing part along the optical axis direction is positioned outside the inner contour of the projection area of the supporting piece along the optical axis direction.

6. The camera module of claim 3, wherein:

the inner wall of the lens seat close to one side of the lens is in a step shape, and the distance between the lens seat and the central shaft of the optical filter is reduced along the reverse direction of the incident direction of light rays.

7. The camera module of claim 3, wherein:

the support piece comprises an annular limiting part and a protruding part protruding from the inner edge of the limiting part to the central shaft of the optical filter, one side of the photosensitive element is fixed on the lens base by the limiting part, the first surface of the optical filter is pasted on the protruding part, and the side wall of the optical filter is abutted to the inner edge of the limiting part.

8. The camera module of claim 1, wherein:

the orthographic projection of the optical filter on the photosensitive element is located within the photosensitive area of the photosensitive element.

9. The camera module of claim 1, wherein:

the photosensitive element includes a microlens array disposed toward the first surface.

10. An electronic device, comprising:

a camera module according to any one of claims 1 to 9.