CN102998765B - Camera module group assembling method and camera module - Google Patents

Abstract

The invention provides a method for assembling a camera module, which includes: providing an imaging module, a mirror base and a lens; the imaging module includes a substrate and an image sensor arranged on the substrate; the mirror base It is arranged on the substrate and covers the image sensor; the lens is accommodated in the mirror holder and fits in the gap of the mirror holder; the outer peripheral side of the lens and the inner peripheral side of the mirror holder are jointly defined at an end away from the substrate A groove; provide a curable glue, and apply the curable glue in the groove; adjust the position and inclination of the lens along its axial direction until the lens is focused on the image sensor and the lens the optical axis overlaps with the central normal of the image sensor; and curing the curable glue. By adopting the method for assembling the camera module, the assembly efficiency can be improved and the imaging quality of the assembled camera module can be guaranteed. The invention also provides a camera module.

Description

Camera module assembly method and camera module

technical field

The invention relates to a method for assembling a camera module and the camera module.

Background technique

A camera module generally includes an imaging module, a lens mount and a lens. The imaging module includes a substrate and an image sensor disposed on the substrate. The mirror base is arranged on the substrate and covers the image sensor. The lens is held in the mirror mount and aligned with the center of the image sensor. Although they are directly or indirectly arranged on the substrate, however, limited by the molding and assembly accuracy, the inclination angles of the image sensor and the lens relative to the substrate are usually inconsistent, causing the center normal of the image sensor to deviate from the optical axis of the lens. As a result, the image formed by the camera module may have defects such as half-edge blur.

In order to solve the above problems, it was proposed to apply curable glue on the connection between the substrate and the mirror base, and adjust the inclination angle of the lens (that is, adjust the thickness of the curable glue at different positions) until the center normal of the image sensor and the light beam of the lens The shafts are overlapped, and then the curable glue is cured. This method of assembly is called active alignment. However, in general, the curable adhesive generally needs to be cured by ultraviolet radiation, and other mechanisms of the camera module are usually arranged on the substrate, which will block the ultraviolet light from irradiating the curable adhesive, thus prolonging the curing time of the curable adhesive , reducing the assembly efficiency of the camera module.

In addition, the camera module has generally adjusted the focus before the active alignment, and adjusted the lens to the focus position along its axis. However, adding curable glue will change the position of the lens along the axis of the lens, causing the lens to deviate from the focus position. , the imaging quality of the image camera module, and the camera module often cannot be refocused after active alignment, because refocusing will change the inclination angle of the lens again, making the previous active alignment invalid.

If the focus of the camera module is adjusted while actively aligning, the position of the lens along its axis cannot be adjusted for a long distance due to the difficulty of maintaining a large thickness of the uncured curable adhesive (generally 0-120um Between), which requires a smaller tolerance of the back focus of the camera module (limited to 120um), that is to say, a higher requirement for the back focus of the camera module, which will increase the manufacturing cost of the camera module.

Contents of the invention

In view of this, it is necessary to provide a camera module assembly method that can improve assembly efficiency.

A method for assembling a camera module, comprising:

An imaging module, a mirror base and a lens are provided; the imaging module includes a substrate and an image sensor disposed on the substrate; the mirror base is disposed on the substrate and covers the image sensor; the The lens is accommodated in the mirror seat and fits with the gap of the mirror seat; the mirror seat forms an inner peripheral side surrounding the lens, and the lens includes an outer peripheral side opposite to the inner peripheral side, and the inner peripheral side and the outer peripheral side The circumferential sides jointly define a groove at an end away from the substrate;

providing a curable glue, and coating the curable glue in the groove;

adjusting the position and inclination of the lens along its axial direction until the lens is focused on the image sensor and the optical axis of the lens overlaps with the central normal of the image sensor; and

The curable glue is cured and assembled into a camera module.

In addition, the invention also provides a camera module.

A camera module, which includes an imaging module, a mirror base, a lens and a curable glue. The imaging module includes a substrate and an image sensor arranged on the substrate. The mirror base is disposed on the substrate and covers the image sensor. The lens is accommodated in the mirror seat and fits with the gap of the mirror seat. The mirror base forms an inner peripheral side surrounding the lens. The lens includes an outer peripheral side opposite to the inner peripheral side. The inner peripheral side and the outer peripheral side jointly define a groove at an end away from the base plate. The curable glue is coated in the groove and cured when the lens is focused on the image sensor and the optical axis of the lens overlaps with the central normal of the image sensor.

Since the groove is set away from the substrate and the opening faces away from the substrate, the ultraviolet rays can directly irradiate the curable glue, shorten the curing time of the curable glue, and improve the assembly efficiency of the camera module. On the other hand, since it allows simultaneous focus adjustment and active alignment, the imaging quality of the camera module can be guaranteed. Finally, since the position of the lens along its axial direction can be adjusted over a long distance, the requirements for the back focus of the camera module are relatively low, and the manufacturing cost of the camera module can be reduced.

Description of drawings

FIG. 1 is a flowchart of a camera module assembly method according to a first embodiment of the present invention.

FIG. 2 is a schematic cross-sectional view of an assembled state of the camera module according to the first embodiment of the present invention.

FIG. 3 is a schematic cross-sectional view of another assembled state of the camera module of FIG. 2 .

FIG. 4 is a schematic cross-sectional view of the assembled camera module of FIG. 2 .

FIG. 5 is a schematic cross-sectional view of a camera module according to a second embodiment of the present invention.

FIG. 6 is a schematic cross-sectional view of a camera module according to a third embodiment of the present invention.

FIG. 7 is a top view of a camera module according to a fourth embodiment of the present invention.

FIG. 8 is a schematic cross-sectional view of the camera module in FIG. 7 along VIII-VIII.

Description of main component symbols

Step 100, 200, 300, 400

Camera module 500

Imaging module 10

Substrate 11

Image sensor 12

mirror mount 20

inner circumference side 21

Inverted conical portion 211

Image side end face 22

Object side end face 23

Image side housing 24

Storage tank on the object side 25

Through hole 26

Step surface 27

first cut 28

The first step surface 29

Lens 30

Outer circumference side 31

Lens barrel 32

Wing 321

Clearance 322

Lens 33

Second cut 34

The second step surface 35

Groove 40

Gap 41

opening 42

Infrared filter 50

curable glue 60

Optical axis OO'

Center normal FF'

The following specific embodiments will further illustrate the present invention in conjunction with the above-mentioned drawings.

detailed description

Please refer to Fig. 1 and Fig. 2, the camera module assembly method of the first embodiment of the present invention includes:

Step 100 : providing an imaging module 10 , a lens mount 20 and a lens 30 . The imaging module 10 includes a substrate 11 and an image sensor 12 disposed on the substrate 11 . The mirror base 20 is disposed on the substrate 11 and covers the image sensor 12 . The lens 30 is accommodated in the mirror holder 20 and fits in a gap with the mirror holder 20 . The mirror holder 20 includes an inner peripheral side 21 surrounding the lens 30 , the lens 30 includes an outer peripheral side 31 opposite to the inner peripheral side 21 , the inner peripheral side 21 and the outer peripheral side 31 are away from the substrate 11 The ends together define a groove 40 .

Specifically, the mirror base 20 includes an image-side end surface 22 attached to the substrate 11 and an object-side end surface 23 opposite to the image-side end surface 22 . Both the image-side end surface 22 and the object-side end surface 23 are perpendicular to the inner circumferential side surface 21 . The image-side end surface 22 defines an image-side receiving groove 24 . The image-side receiving groove 24 is in the shape of a square, and is used for accommodating the image sensor 12 which is also in the shape of a square. The object-side end surface 23 defines an object-side receiving groove 25 . The object-side receiving groove 25 is cylindrical, and is used for receiving the lens 30 which is also cylindrical. The inner surface of the object-side receiving groove 25 is the inner peripheral surface 21 .

The mirror base 20 also defines a through hole 26 communicating with the object-side receiving groove 25 and the image-side receiving groove 24 . In this way, the light passing through the lens 30 can enter the image-side receiving groove 24 from the through hole 26 , and then project on the image sensor 12 .

The camera module 500 also includes an infrared filter 50 covering the image sensor 12 for filtering out the infrared part of the light entering the image sensor 12 from the lens 30 to prevent it from affecting the imaging quality. Specifically, the infrared filter 50 of this embodiment is held in the through hole 26 .

The lens 30 includes a lens barrel 32 and a plurality of lenses 33 accommodated in the lens barrel 32 . The outer side of the lens barrel 32 is the outer peripheral side 31 .

It can be understood that there is a gap 41 between the inner peripheral side 21 and the outer peripheral side 31 to allow the tilt angle adjustment of the lens 30 (please refer to the following).

In this embodiment, the mirror base 20 is formed with a first cutout 28 with an inverted triangular cross-section at the joint between the inner peripheral side 21 and the image-side end surface 22, that is to say, the inner peripheral side 21 includes a connection The inverted conical portion 211 of the image-side end surface 22 . The inverted conical portion 211 together with the outer peripheral side 31 and its corresponding portion constitute the groove 40 .

It can be understood that, in this way, the groove 40 forms an opening 42 facing away from the substrate 11 .

Of course, the groove 40 is not limited to this embodiment. Referring to FIG. 5 , according to the second embodiment of the present invention, a second cutout 34 is formed on the lens 30 . The groove 40 is formed by the second cutout 34 . Referring to FIG. 6 , according to the third embodiment of the present invention, the first cutout 28 and the second cutout 34 are respectively formed on the mirror base 20 and the lens 30 . The groove 40 is jointly formed by the first cutout 28 and the second cutout 34 . Of course, the shapes of the first cutout 28 and the second cutout 34 are not limited to this embodiment, and may be other suitable shapes.

Step 200 : provide a curable glue 60 (please refer to FIG. 3 ), and apply the curable glue 60 in the groove 40 . Specifically, the curable glue 60 is an ultraviolet curable glue, and is applied into the groove 40 from the opening 42 .

Please refer to FIG. 7 , preferably, in the step 200 , only four drops of the curable glue 60 are applied to four different positions of the groove 40 to facilitate subsequent adjustment of the lens 30 .

Of course, the number of drops of the curable glue 60 can be determined according to requirements, such as three drops or more.

Step 300: Adjust the axial position and inclination of the lens 30 until the lens 30 focuses on the image sensor 12 and the optical axis OO' of the lens 30 overlaps with the central normal FF' of the image sensor 12 (Please refer to Figure 4).

Specifically, during the adjustment process, the image sensor 12 can be controlled to continuously form an image, and the overall sharpness of the formed image and the sharpness of its four edges can be analyzed. When the overall sharpness of the image is the largest and the sharpness of the four edges is the same, it can be determined that the lens 30 is focused on the image sensor 12 and the optical axis OO' of the lens overlaps with the central normal FF' of the image sensor. .

Step 400 : Curing the curable adhesive 60 to assemble a camera module 500 .

Specifically, if only four drops of the curable glue 60 are applied in the step 200, the curable glue 60 should be used to seal the groove 40 after curing, and the curable glue 60 should be cured again to avoid exposure.

Please refer to FIG. 8 , preferably, the lens barrel 32 exposes the object-side receiving groove 25 and includes a plurality of fins 321 . A portion of the plurality of fins 321 exposing the object-side receiving groove 25 from the outer circumferential side 31 extends outward along the radial direction of the lens 30 . The plurality of fins 321 are distributed along a circumference of the outer peripheral side 31 at intervals. In this embodiment, the number of the plurality of fins 321 is twelve, and they are equidistantly distributed (that is, at intervals of thirty degrees). A gap 322 is formed between every two adjacent fins 321 . Four drops of the curable glue 60 are respectively applied to the groove 40 from the three gaps 322 . In this way, during the process of curing the four drops of the curable glue 60 , the four drops of the curable glue 60 can be irradiated with ultraviolet rays respectively. And when adopting this curable glue 60 to seal this groove 40 and curing, this curable glue 60 can be bonded to this fin 321, like this, can increase the bonding area of this lens 30, improve this mirror base 20 and this Bond strength between lenses.

Preferably, the mirror base 20 can form a first stepped surface 29 facing away from the substrate 11 on the inner peripheral side 21, and the lens barrel 32 can form a first stepped surface 29 facing the first stepped surface 29 on the outer peripheral side 31. The second stepped surface 35 . The cooperation between the first stepped surface 29 and the second stepped surface 35 can prevent light from entering the image sensor 12 from the gap 41 .

It can be understood that Fig. 2-6 and Fig. 7 only show a section of the lens 30, and the actual lens 30 is rotationally symmetrical about the optical axis OO'. The mirror base 20 is also rotationally symmetrical about its central axis (not shown). The imaging module 10 is a rectangle symmetrical to the cross section.

Because, because the groove 40 is set away from the substrate 11, and the opening 42 faces away from the substrate 11, ultraviolet rays can directly irradiate the curable glue 60, shorten the curing time of the curable glue 60, and improve the assembly of the camera module 500. efficiency.

On the other hand, the imaging quality of the camera module 500 can be guaranteed due to allowing simultaneous focusing and active alignment. Finally, because the position of the lens 30 along its axial direction can be adjusted over a long distance, the requirements for the back focus of the camera module 500 are low, and the manufacturing cost of the camera module 500 can be reduced.

In a word, those of ordinary skill in the art should recognize that the above embodiments are only used to illustrate the present invention, rather than to limit the present invention, as long as within the spirit of the present invention, the above examples Appropriate changes and changes all fall within the scope of protection of the present invention.

Claims (10)

1. a camera module group assembling method, it comprises:

An imaging modules, a microscope base and a camera lens are provided; This imaging modules comprises a substrate and an image sensor arranged on the substrate; This microscope base arranges on the substrate and covers this image sensor; This camera lens is contained in this microscope base and coordinates with this microscope base gap; This microscope base comprises an inner periphery side around this camera lens, and this camera lens comprises an excircle side relative with this inner periphery side, and a groove is being defined jointly away from this substrate one end in this inner periphery side and this excircle side;

One curable glue is provided, and this curable glue is coated in this groove;

Adjust this camera lens along the position of its axis and inclination angle until this lens focusing is in this image sensor and the optical axis of this camera lens is overlapping with the centre normal of this image sensor; And

Solidify this curable glue.

2. camera module group assembling method as claimed in claim 1, is characterized in that, before this set-up procedure, only apply many these curable glues to this groove; After these many curable glues of solidification, be again coated with this curable glue and seal this groove, and again solidify this curable glue.

3. camera module group assembling method as claimed in claim 2, it is characterized in that, this camera lens stretches out this microscope base, and comprise the multiple fin that extend radially outwardly of part along this camera lens showing out this microscope base from this outer circumferential sides, the plurality of fin was arranged along a circle spacing of this excircle side, form a gap between every two adjacent fins, these many curable glues put on this groove from this gap of multiple correspondence respectively.

4. camera module group assembling method as claimed in claim 1, it is characterized in that, this set-up procedure comprises:

Control the continuous imaging of this image sensor; And

Analyze institute become the overall sharpness of image and the sharpness at four edges thereof until ought become the overall sharpness of image maximum and sharpness that is its four edge is identical.

5. a camera module, it comprises an imaging modules, microscope base, a camera lens and a curable glue; This imaging modules comprises a substrate and an image sensor arranged on the substrate; This microscope base arranges on the substrate and covers this image sensor; This camera lens to be contained in this microscope base and to coordinate with this microscope base gap; This microscope base comprises an inner periphery side around this camera lens, and this camera lens comprises an excircle side relative with this inner periphery side, and a groove is being defined jointly away from this substrate one end in this inner periphery side and this excircle side; This curable glue is coated in this groove, and this camera lens through adjustment axial location and inclination angle until focus in this image sensor and the optical axis of this camera lens is overlapping with the centre normal of this image sensor time solidify.

6. camera module as claimed in claim 5, it is characterized in that, this microscope base is formed with first otch in this inner periphery side and this end face junction, image side, and this first otch forms this groove.

7. camera module as claimed in claim 5, it is characterized in that, this camera lens forms second otch, and this groove is made up of this second otch.

8. camera module as claimed in claim 5, it is characterized in that, this microscope base is formed with first otch in this inner periphery side and this end face junction, image side, and this camera lens forms second otch, and this groove is made up of this first otch and this second otch.

9. camera module as claimed in claim 5, it is characterized in that, this camera lens stretches out this microscope base, and comprise the multiple fin that extend radially outwardly of part along this camera lens showing out this microscope base from this outer circumferential sides, the plurality of fin was arranged along circle spacing of this excircle side, formed a gap between every two adjacent fins.

10. camera module as claimed in claim 5, is characterized in that, this microscope base forms the first cascaded surface of this substrate dorsad on this inner periphery side, and this lens barrel forms a second-order tread towards this first cascaded surface on this excircle side; This first cascaded surface coordinates with this second-order tread and can prevent light from injecting this image sensor from this gap.