LENS ASSEMBLY MODULE WITH LIGHT SHIELDING FILM

A lens assembly module is provided and includes: a plurality of lenses, a lens barrel disposed around the lens and including an incident end, where light from the object enters the lens barrel, and an emergent end, where light from the object exits the lens barrel; and a first light shielding film disposed in a mounting recess, which is defined by a surface of one of the lenses closest to the emergent end and is adjacent to a circumference of the lens closest to the emergent end.

FIELD OF INVENTION

The present disclosure relates to the technical field of a lens assembly module, and particularly to a lens assembly module, which includes a light shielding film to replace a back cover.

BACKGROUND OF DISCLOSURE

Typically, a back cover is required for a general lens assembly module for achieving the function of waterproof sealing and the function of reducing stray light. As shown inFIG. 1, a conventional lens assembly module1has a lens11, a barrel12, a back cover13, a light shielding film14, and a spacer ring15. The lens assembly module1can be combined with a sensor3to form a camera module. The design of the back cover13in the conventional lens assembly module1is described below.

As shown inFIG. 2, one of the main functions of the back cover13is waterproof sealing. Since the lens assembly module1is sensitive to moisture and dust, both the front end and the back end have to be sealed to prevent moisture and dust particles from entering the barrel12.

For example, in the manufacturing processes, in order to improve the problem that dust remains on the surface of the lens assembly module1, the lens assembly module1undergoes a washing process. However, the lens11in the lens assembly module is generally manufactured by injection molding, so an depression111is formed on the lens11on the position of the running gate during the shearing process (the outer circumference of the lens11is not a full circle). An slit112is formed when the lens11is assembled into the lens barrel12. After the lens assembly module1undergoes the washing process, water flows into the lens assembly module1through the slit112and leaves residues, thereby causing a water stain issue. Therefore, in the general lens assembly module1, a back cover13is assembled onto the lens closest to the sensor to achieve the sealing by a dispensing and curing process, or by a hot melt process.

The light reflected by the portion other than the aspherical optical effective area of the lens closest to the rearmost end (closest to the sensor) and the surface of the sensor3often causes stray light. In general, if the back cover13is absent in the lens assembly module1, the stray light is easily reflected onto the sensor multiple times and influences the image. In order to reduce stray light, the aforementioned back cover13is generally made black or inked to absorb stray light.

However, at present, material of the back cover13is generally plastic. Although material is black in appearance, its effective reflectivity still causes considerable energy reflection. If stray light occurs, it may still cause a relatively significant and serious impact.

Furthermore, the back cover13has heavy weight, large size, and high costs, which are unfavorable to the manufacture of the lens assembly module1. For example, the plastic back cover13has expensive molding costs. Even if the back cover13is made of metal, the back cover also has an expensive material cost issue.

An innovative design is needed for the lens assembly module to reduce the manufacture costs. Therefore, it is necessary to develop a\ novel member in a lens assembly module to replace the back cover13.

SUMMARY OF INVENTION

A primary object of the present disclosure is to provide a lens assembly module with a novel light shielding film to replace a back cover, for reducing the manufacture costs.

A lens assembly module is provided in an embodiment of the present disclosure, and includes:

a plurality of lenses configured for forming an optical image of an object,

a lens barrel disposed around the lens for supporting the lenses, and including an incident end, where light from the object enters the lens barrel, and an emergent end, where light from the object exits the lens barrel; and

a first light shielding film configured for shielding stray light, and disposed in a mounting recess, which is defined by a surface of one of the lenses closest to the emergent end and is adjacent to a circumference of the lens closest to the emergent end, wherein the first light shielding film and the mounting recess are both annular.

In accordance with an embodiment of the present disclosure, a depression is defined by a circumferential surface of the lens closest to the emergent end, a surface of the depression and the inner circumferential surface of the lens barrel together define an opening, and the first light shielding film is configured to completely cover the opening.

In accordance with an embodiment of the present disclosure, a plurality of indents are defined by an outer circumferential surface of the first light shielding film, and surfaces of the indents and an inner circumferential surface of the lens barrel together define a plurality of holes.

In accordance with an embodiment of the present disclosure, the first light shielding film includes an intact arc part ranging from 50° to 90°, wherein no indent is defined by the intact arc part, and the intact arc part is configured for completely covering the opening.

In accordance with an embodiment of the present disclosure, the first light shielding film is bonded to the lens closest to the emergent end and the lens barrel by an adhesive through the holes.

In accordance with an embodiment of the present disclosure, an outer radius of the first light shielding film is shorter than or equivalent to a radius of the lens closest to the emergent end.

In accordance with an embodiment of the present disclosure, material of the first light shielding film includes black polyethylene terephthalate (PE).

In accordance with an embodiment of the present disclosure, an angle between a side wall and a bottom of the mounting recess ranges from 93° to 130°, and a depth of the mounting recess is deeper than 0.01 mm.

In accordance with an embodiment of the present disclosure, a sub-recess is defined by a bottom of the mounting recess for storing the adhesive, and is adjacent to the circumference of the lens closest to the emergent end.

In accordance with an embodiment of the present disclosure, the lens assembly module further includes a second light shielding film configured for shielding stray light, and disposed between two of the lenses, wherein the second light shielding film is annular.

A lens assembly module is also provided in an embodiment of the present disclosure, and includes:

a lens barrel including:

a front end being close to an object side of the lens assembly module;

a rear end being close to an image side of the lens assembly module and being opposite to the front end; and

a peripheral wall which extends along an axis from the front end to the rear end and surrounds the axis to define a receiving chamber;

a plurality of lenses disposed in the receiving chamber in sequence along the axis between the front end and the rear end of the lens barrel, wherein an annular mounting recess is defined by a surface of the lens closest to the rear end and is adjacent to the peripheral wall of the lens barrel, and

a first light shielding film disposed in the mounting recess, wherein the first light shielding film and the mounting recess are both annular and coaxial with and the lens barrel.

In accordance with an embodiment of the present disclosure, a depression is defined by a lateral side of the lens closest to the emergent end, the depression and the peripheral wall of the lens barrel together define an opening, and the first light shielding film is configured to completely cover the opening.

In accordance with an embodiment of the present disclosure, a plurality of indents are defined by a lateral side of the first light shielding film, and the indents and the peripheral wall of the lens barrel together define a plurality of holes.

In accordance with an embodiment of the present disclosure, the first light shielding film includes an intact arc part ranging from 50° to 90°, wherein no indent is defined by the intact arc part, and the intact arc part is configured for completely covering the opening.

In accordance with an embodiment of the present disclosure, the first light shielding film is bonded to the lens closest to the rear and the lens barrel by an adhesive through the holes.

In accordance with an embodiment of the present disclosure, an outer radius of the first light shielding film is shorter than or equivalent to a radius of the lens closest to the rear end.

In accordance with an embodiment of the present disclosure, material of the first light shielding film includes black polyethylene terephthalate (PE).

In accordance with an embodiment of the present disclosure, an angle between a side wall and a bottom of the mounting recess ranges from 93° to 130°, and a depth of the mounting recess is deeper than 0.01 mm.

In accordance with an embodiment of the present disclosure, a sub-recess is defined by a bottom of the mounting recess for storing the adhesive, and is adjacent to the peripheral wall of the lens barrel.

In accordance with an embodiment of the present disclosure, the lens assembly module further includes a second light shielding film configured for shielding stray light, and disposed between two of the lenses, wherein the second light shielding film is annular and coaxial with the lens barrel.

In the lens assembly module in accordance with an embodiment of the present disclosure, the first light shielding film is disposed in the mounting recess defined by the surface of the lens closest to the rear end to replace the back cover for reducing the manufacture costs of the lens assembly module. The indents defined by the outer circumference of the first light shielding film, together with the peripheral wall of the lens barrel, defines a plurality of holes, through which the first light shielding film is bonded to the lens closest to the rear and the lens barrel by an adhesive. A depression defined by the circumference of the lens closest to the rear end is completely covered by the intact arc part of the first light shielding film for achieving the waterproof sealing effect. Material of the first light shielding film includes black polyethylene terephthalate (PE) having a low reflectivity and fulfilling the function of reducing stray light.

DETAILED DESCRIPTION OF PREFERRED EMBODIMENTS

The following description of the embodiments with reference to the accompanying drawings is used to illustrate particular embodiments of the present disclosure. The directional terms used in the present disclosure, such as “upper”, “lower”, “front”, “back”, “left”, “right”, “inner”, “outer”, “side surface”, etc., are only directions with regard to the accompanying drawings. Therefore, the directional terms used for describing and illustrating the present disclosure are not intended to limit the present disclosure.

In the drawings, units with similar structures are indicated by the same reference number.

As to an “embodiment” mentioned herein, the particular features, structures, or characteristics described in this embodiment, which may be described in combination with the embodiment, may be included in at least one embodiment of the present disclosure. The phrases appearing at various locations in the specification do not necessarily refer to the same embodiments, nor to the embodiments being alternative to, mutually exclusive with, or independent from other embodiments. It is explicitly and implicitly understood by a person of ordinary skill in the art that the embodiments described herein may be combined with other embodiments.

The content of the present disclosure is described in detail by reference to embodiments below in conjunction with the accompanying drawings.

Refer toFIG. 3, which is a cross-sectional side view illustrating a lens assembly module in accordance with an embodiment of the present disclosure.

In the present disclosure, a lens assembly module2is provided and includes a plurality of lenses21, a lens barrel22, and a first light shielding film23.

The lens barrel22is disposed around the lenses21for supporting the lenses21, and includes a front end221, a rear end222, and a peripheral wall223.

The front end221is close to an object side of the lens assembly module2, and thus, generally, light from the object enters the lens barrel22through the front end221, which may be referred to as an incident end in most embodiments. The rear end222is close to an image side of the lens assembly module2and opposite to the front end221, and thus, generally, light from the object exits the lens barrel22through the rear end221, which may be referred to as an emergent end in most embodiments. The peripheral wall223which extends along an axis224from the front end221to the rear end222and surrounds the axis224to define a receiving chamber225.

The plurality of lenses21are configured for forming an optical image of the object, and are disposed in the receiving chamber225in sequence along the axis224between the front end221and the rear end222of the lens barrel22, wherein a mounting recess211is defined by a surface of one of the lenses21closest to the rear end222, and is configured for guiding, fixing and mounting the first light shielding film23, and for making the first light shielding film23and the barrel22be coaxial. Generally, the mounting recess211and the first light shielding film23are both annular and are coaxial with the lens barrel22. Typically, the mounting recess211is adjacent to a circumference of the lens21closest to the rear end222, and, preferably, is adjacent to the peripheral wall223of the lens barrel22.

The first light shielding film23is configured for shielding stray light, and is disposed in the mounting recess211. In an embodiment of the present disclosure, black polyethylene terephthalate (PET) having a low reflectivity is used as material of the first light shielding film23to replace the back cover in the conventional lens assembly module and improve the function of reducing stray light. The surface of the first light shielding film23made of this material may undergo a blackening process. The unit price of the first light shielding film23is low, and no expensive plastic mold is needed.

Furthermore, in an embodiment of the present disclosure, in dispensing and curing processes, the lens barrel22, the lenses21and the first light shielding film23are bonded together by dispensing an adhesive25(e.g. glue), and the assembled structure also achieves the same fixing and sealing effects as those of the back cover. Material of the adhesive25may also include black polyethylene terephthalate (PET).

Refer toFIG. 4, which includes a cross-sectional side view and a top view illustrating an outer radius of a first light shielding film, R2, and a radius of a lens, R1, of a lens assembly module in accordance with an embodiment of the present disclosure.

As shown inFIG. 3andFIG. 4, in an embodiment of the present disclosure, for ensuring that the adhesive25(e.g. glue) smoothly flows from the top of the first light shielding film23to the lens21closest to the rear end222in the dispensing process, the outer radius of the first light shielding film23is shorter than or equivalent to the radius of the lens21closest to the rear end222(the outer radius of the first light shielding film23is R2, and the radius of the lens21is R1), and is longer than or equivalent to the radius of the lens21closest to the rear end222minus 0.05 mm. Specifically, the mathematical relationship is as follows: R1≥R2≥R1−0.05 mm.

Refer toFIG. 5, which a cross-sectional side view illustrating a mounting recess defined by a surface of a lens in a lens assembly module in accordance with an embodiment of the present disclosure.

As shown inFIG. 5, in an embodiment of the present disclosure, the mounting recess211is defined by a surface of the lens21closest to the rear end222, is adjacent to the peripheral wall223of the lens barrel22, and is configured for guiding, fixing or mounting the first light shielding film23, and for making the first light shielding film23and the barrel22be coaxial, so that the width of the gap (R1−R2) between the first light shielding film23and the peripheral wall223of the barrel22is consistent.

In an embodiment of the present disclosure, an angle2111between a side wall2112and a bottom2113of the mounting recess211ranges from 93° to 130°, and a depth L of the mounting recess211is deeper than 0.01 mm. A sub-recess212is defined by the bottom2113of the mounting recess211for storing the dispensed adhesive25(e.g. glue), typically, is adjacent to the circumference of the lens21closest to the rear end222and, in some embodiments, is adjacent to the peripheral wall223of the lens barrel22.

Refer toFIG. 6, which includes a cross-sectional side view and a top view illustrating a plurality of indents defined by an outer circumferential surface of a first light shielding film in a lens assembly module in accordance with an embodiment of the present disclosure.

In an embodiment of the present disclosure, the first light shielding film23is bonded to the lens21closest to the rear end222and the lens barrel22by the adhesive25(e.g. glue). In order to allow the glue25to smoothly and controllably pass to the lens21, a plurality of indents231are defined by a lateral side of the first light shielding film23, and the indents231and the peripheral wall223of the lens barrel22together define a plurality of holes232, as shownFIG. 6. The glue25smoothly and controllably passes to the lens21through the holes232. Specifically, the plurality of indents231are defined by an outer circumferential surface of the first light shielding film23, and surfaces of the indents231and an inner circumferential surface of the lens barrel22together define the plurality of holes232.

Refer toFIG. 7, which includes a cross-sectional side view and a top view illustrating an intact arc part ranging from 50° to 90° in a lens assembly module for completely covering an opening in accordance with an embodiment of the present disclosure.

In an embodiment of the present disclosure, a depression213is defined by a lateral side of the lens21closest to the rear end222, the depression213and the peripheral wall223of the lens barrel22together define an opening214(e.g. a slit). As shown inFIG. 7, for ensuring that the first light shielding film23completely covers the opening214for achieving the waterproof sealing effect, the first light shielding film23includes an intact arc part233ranging from 50° to 90°, wherein no indent231is defined by the intact arc part233, and the intact arc part233is configured for completely covering the opening214.

Specifically, the depression213is defined by a circumferential surface of the lens21closest to the rear end222, a surface of the depression213and the inner circumferential surface of the lens barrel22together define the opening214, and the intact arc part233ranging from 50° to 90° of the first light shielding film23is configured to completely cover the opening214.

Refer toFIG. 8, which includes top views illustrating various first light shielding films in accordance with multiple embodiments of the present disclosure.

As shown inFIG. 8, in an embodiment of the present disclosure, in addition to at least an intact arc part233ranging from 50° to 90° covering the opening214, the first light shielding film23may have various numbers and shapes of the indents231. Moreover, the lenses21in the lens assembly module2may also be non-circular lenses. Furthermore, the shape and the size of the first light shielding film23may specifically match the shape and the size of the lenses21, making the lens assembly module2be assembled and manufactured easily and reducing stray light.

In an embodiment of the present disclosure, the lens assembly module2further includes a second light shielding film24, wherein the second light shielding film24is configured for shielding stray light, is disposed between two of the lenses21, and is adjacent to circumferences of the two lenses21and the peripheral wall223of the lens barrel22, wherein the second light shielding film24is annular and coaxial with the lens barrel.

In the lens assembly module in accordance with an embodiment of the present disclosure, the first light shielding film is disposed in the mounting recess defined by the surface of the lens closest to the rear end to replace the back cover for reducing the manufacture costs of the lens assembly module. The indents defined by the outer circumference of the first light shielding film, together with the peripheral wall of the lens barrel, defines a plurality of holes, through which the first light shielding film is bonded to the lens closest to the rear and the lens barrel by an adhesive. A depression defined by the circumference of the lens closest to the rear end is completely covered by the intact arc part of the first light shielding film for achieving the waterproof sealing effect. Material of the first light shielding film includes black polyethylene terephthalate (PE) having a low reflectivity and fulfilling the function of reducing stray light.

The present disclosure has been described with a preferred embodiment thereof and it is understood that various modifications, without departing from the spirit of the present disclosure, are in accordance with the embodiments of the present disclosure. Hence, the embodiments described are intended to cover the modifications within the scope and the spirit of the present disclosure, rather than to limit the present disclosure.

In summary, although the preferable embodiments of the present disclosure have been disclosed above, the embodiments are not intended to limit the present disclosure. A person of ordinary skill in the art, without departing from the spirit and scope of the present disclosure, can make various modifications and variations. Therefore, the scope of the disclosure is defined in the claims.