TW201821847A - Lens assembly and camera device using the same - Google Patents

Abstract

The disclosure provides a lens assembly including a lens holding member, a lens and an engaging portion. The lens holding member includes a top wall and a lateral wall extending from the edge of the top wall. An opening is formed on the top wall. The lens is disposed in the lens holding member arranged such that the optical axis of the lens is aligned with the opening. The engaging portion is protruded outwardly from the lateral wall, and the projection of the engaging portion in a direction that is parallel to the optical axis is located on the lens.

Description

   Lens component and photographing device using the lens component   

This disclosure relates to a lens assembly and a photographing device using the lens assembly, and more particularly to a photographing device to which the lens assembly has a smaller volume.

With the advancement of technology, the camera technology has been continuously strengthened and the price has dropped. Photography has become the basic function of portable electronic products. Therefore, various portable electronic products such as mobile phones, personal digital assistants (PDAs), notebook computers, and tablet computers Such as is generally equipped with a small-scale camera for users to take pictures of daily life.

Generally, a small-scale camera includes an image sensor and a lens assembly. The image sensor is, for example, a charge coupled device (CCD) or a complementary metal oxide semiconductor sensor (CMOS sensor).

The lens assembly includes a lens barrel and a lens holder, and the threaded portion is disposed on the lens barrel and the lens holder. During the process of assembling the lens barrel and the lens holder through the threaded part, the position of the lens barrel relative to the lens holder can be adjusted through the rotation of the lens barrel, so that the image is projected onto the image plane of the image sensor. The above-mentioned screw portion inevitably causes an increase in the volume of the lens assembly, and causes a decrease in portability, which is inconsistent with the trend of the electronic device to be lightweight and thin. Therefore, a lens module that overcomes the structural limitations of the conventional techniques is required.

On the other hand, Japanese Patent Laid-Open No. 2012-256040 discloses a lens module in which a lens is connected to a lens bearing base by an adhesive. This type of combination has a weak structural strength, and because of the lack of personnel assembly, the lens may also be tilted relative to the lens carrier, which is not conducive to improving the image quality.

One objective of this disclosure is to provide a miniaturized lens assembly that includes an engaging portion to be combined with a corresponding groove on a lens mount. The engaging portion is provided without affecting the predetermined optical effect of the lens component, and has a smaller volume and a lighter weight than a conventional lens component without a screw structure.

According to some embodiments of the present disclosure, the lens assembly includes a lens holder, a lens, and an engaging portion. The lens holder includes a front cover and a side cover extending from an edge of the front cover. An opening is defined in the front cover. The lens is disposed on the lens holder so that the optical axis of the lens is aligned with the opening. The engaging portion protrudes outward from the side cover, and a projection of the engaging portion in a direction parallel to the optical axis is located on the lens.

In the above embodiment, the engaging portion is closer to the light incident surface of the lens component than the lens, and the engaging portion is close to the front cover. Alternatively, the engaging portion is farther from the light incident surface of the lens component than the lens.

In the above embodiment, the side wall includes a first annular portion, a connecting portion and a second annular portion. The connecting portion connects a side of the first annular segment portion near the front cover. The second annular portion connects the first annular portion via the connecting portion. In the direction perpendicular to the optical axis, the width of the second annular segment is smaller than the width of the first annular segment. The engaging portion is disposed on the second annular portion and is spaced apart from the connecting portion by a distance.

Alternatively, the side wall includes a first annular portion, a connecting portion and a second annular portion. The connecting portion connects a side of the first annular segment portion away from the front cover. The second annular portion connects the first annular portion via the connecting portion, wherein the first annular portion is perpendicular to the optical axis direction. The width of the two annular segments is smaller than the width of the first annular segment. The engaging portion is disposed on the second annular portion and is spaced apart from the connecting portion by a distance.

In the above embodiment, the lens assembly includes a plurality of fixing portions, and the fixing portions are circumferentially disposed on the side wall at intervals.

In the above embodiment, the projection of the engaging portion in a direction parallel to the optical axis is located above the optically effective surface of the lens.

Another object of this disclosure is to provide a photographing device. The photographing device includes the lens assembly and an image sensing side element of any one of the above embodiments. The image sensing side element is disposed along the optical axis of the lens and configured to receive light passing through the lens.

In the above embodiment, the photographing device further includes a lens holder, a driving coil, and a driving magnet. The lens base includes a body disposed around the side cover and a raised structure formed on an inner wall surface of the body. The engaging portion is abutted against the protruding knot to fix the lens assembly on the lens base. A driving coil is disposed on the body of the lens holder, and a driving magnet is disposed opposite the driving coil.

1‧‧‧ lens drive module

2‧‧‧ electromagnetic drive components

3, 3a, 3b ‧‧‧ lens assembly

5‧‧‧Circuit Board

7‧‧‧light sensor

10‧‧‧shell

101‧‧‧ Upper shell

102‧‧‧side shell parts

12‧‧‧ base

14‧‧‧Circuit Board

16‧‧‧coil substrate

162‧‧‧OIS drive coil

164‧‧‧OIS drive coil

166‧‧‧ Sag

20‧‧‧Frame

201‧‧‧side frame

202‧‧‧Receiving slot

22‧‧‧up shrapnel

24‧‧‧Under shrapnel

26‧‧‧Mirror mount

261‧‧‧ Ontology

2611‧‧‧Inner side wall

2612‧‧‧ lower side edge

2613‧‧‧upper edge

263‧‧‧ raised structure

2631‧‧‧Part I

2632‧‧‧Part Two

265‧‧‧channel

28‧‧‧Drive coil

29‧‧‧ magnetic components

31, 31b‧‧‧ lens holder

32‧‧‧ front cover

33, 33b‧‧‧ side cover

331‧‧‧Ring (first ring) (second ring)

332‧‧‧Connection Department

333‧‧‧Ring (first ring) (second ring)

334‧‧‧Connection Department

335‧‧‧Ring (second ring) (third ring)

336‧‧‧Connection Department

337‧‧‧Ring section (second ring section)

34‧‧‧Lens Unit

341, 342, 343, 344‧‧‧ lens

36, 36a, 36b ‧‧‧ Engagement Department

40‧‧‧Ring line

a‧‧‧arrow

H1‧‧‧ height

H2‧‧‧ height

D1‧‧‧Pitch

D2‧‧‧Pitch

R1‧‧‧ extension line segment

O‧‧‧ Optical axis

Complete disclosure according to the following detailed description and accompanying drawings. It should be noted that, according to the general operations of the industry, the illustrations are not necessarily drawn to scale. In fact, the size of the element may be arbitrarily enlarged or reduced for clarity.

FIG. 1 shows an exploded view of the structure of a photographing device according to some embodiments of the present disclosure.

FIG. 2 is a schematic diagram showing a partial structure of a lens holder according to some embodiments of the present disclosure.

FIG. 3A shows a perspective view of a lens assembly according to some embodiments of the present disclosure.

FIG. 3B shows a side view of a lens assembly according to some embodiments of the present disclosure.

FIG. 4 is a schematic cross-sectional view of a lens assembly according to some embodiments of the present disclosure.

FIG. 5 is a schematic diagram illustrating an assembly method of a lens assembly and a lens holder according to some embodiments of the present disclosure, wherein the engaging portion is not combined with the convex structure.

FIG. 6 shows a schematic diagram of an assembly method of a lens assembly and a lens holder according to some embodiments of the present disclosure, in which the engaging portion is combined with a convex structure.

FIG. 7A is a perspective view of a lens assembly according to some embodiments of the present disclosure.

FIG. 7B illustrates a side view of a lens assembly according to some embodiments of the present disclosure.

FIG. 8 is a schematic cross-sectional view of a lens assembly according to some embodiments of the present disclosure.

FIG. 9A shows a perspective view of a lens assembly according to some embodiments of the present disclosure.

FIG. 9B illustrates a side view of a lens assembly according to some embodiments of the present disclosure.

FIG. 10 is a schematic cross-sectional view of a lens assembly according to some embodiments of the present disclosure.

In the following, several specific preferred embodiments will be enumerated, and will be described in detail in conjunction with the accompanying drawings, and several embodiments will be shown in the figure. However, this disclosure can be implemented in many different forms, and is not limited to the embodiments described below. The embodiments provided herein can make the disclosure more thorough and complete, so as to fully convey the scope of this disclosure to those skilled in the art. By.

It must be understood that elements specifically described or illustrated may exist in various forms known to those skilled in the art. In addition, when an element is "on" another element or substrate, it may mean "directly" on the other element or substrate, or it may mean that an element is on another element or substrate, or it is sandwiched between other elements or substrates. Other components.

In addition, relative terms such as "lower" or "bottom" and "higher" or "top" may be used in the embodiments to describe the relative relationship between one element of the figure and another element. It can be understood that if the illustrated device is turned upside down, the components described on the "lower" side will become the components on the "higher" side.

Here, the terms "about" and "approximately" usually indicate within 20% of a given value or range, preferably within 10%, and more preferably within 5%. The quantity given here is an approximate quantity, which means that the meanings of "about" and "approximately" can still be implied without specific instructions.

FIG. 1 shows an exploded view of the structure of the photographing device 1 according to some embodiments of the present disclosure. The photographing device 1 includes an electromagnetic driving component 2, a lens component 3, a main circuit board 5 and an image sensing element 7. The electromagnetic drive unit 2 is configured to carry the lens unit 3 and control the displacement of the lens unit 3. The image sensing element 7 is disposed on the main circuit board 5 and faces the last lens of the lens assembly 3. The image sensing element 7 may include an image sensor composed of a photosensitive element such as a charge coupled element (CCD) or a complementary metal oxide semiconductor (CMOS). When the photographing device 1 captures an image, the light advances along the optical axis O of the lens assembly 3 and then strikes the image sensor 7. The image sensing element 7 sends out an electronic signal after sensing light to generate an image.

According to some embodiments of the present disclosure, the structural features of the electromagnetic drive assembly 2 are described as follows.

Referring to FIG. 1, in some embodiments, the electromagnetic drive assembly 2 includes a housing 10, a base 12, a circuit board 14, a coil substrate 16, a frame 20, and an upper spring 22 located on an optical axis O. , A lower spring 24, a bearing base 26, a focus driving coil 28, a plurality of magnetic elements (for example: four magnetic elements 29), and a plurality of eyelets (for example: four eyelets 40). The components of the electromagnetic drive assembly 2 can be increased or decreased according to requirements, and are not limited to this embodiment.

The casing 10 includes an upper shell member 101 and a side shell member 102. The upper shell member 101 is rectangular, and the side shell member 102 extends from the edge of the upper shell member 101 toward the base 12 and is connected to the base 12. The housing 10 and the base 12 define an internal space to accommodate the remaining components of the electromagnetic drive assembly 2.

The circuit board 14 is disposed on the base 12 and is configured to electrically connect a control module (not shown) and internal electronic components of the electromagnetic drive module 2. The coil substrate 16 is disposed on the circuit board 14 and includes a plurality of OIS driving coils, for example, two OIS (optical image stabilization) driving coils 162 and two OIS driving coils 164.

The frame body 20 includes four side frame members 201 connected in sequence around the optical axis O, and each side frame member 201 includes a receiving groove 202 formed thereon. The lens holder 26 is surrounded by the frame body 20. The upper elastic piece 22 and the lower elastic piece 24 are respectively disposed on two opposite sides of the frame body 20 and the lens holder 26 in the direction of parallel optical axis O, so that the lens holder 26 can move relative to the frame body 20 in the vertical direction (Z direction). Each ring line 40 is connected between the upper elastic piece 22 and the base 12, so that the frame 20 can move relative to the base 12 in the direction of the vertical optical axis O.

The driving coil 28 is a ring structure that surrounds the outer side of the mirror base 26 and is configured to pass a current to generate a magnetic field to drive the mirror base 26 to move relative to the base 12. The four magnetic elements 29 are respectively disposed on the four side frame members 201. By positioning with the frame 20, four magnetic elements 29 are provided corresponding to the focus driving coils 28, and four magnetic elements 29 are provided corresponding to the OIS driving coils 162, 164.

FIG. 2 is a schematic diagram showing a part of the structure of the lens holder 26 according to some embodiments of the present disclosure. In some embodiments, the mirror base 26 includes a ring-shaped body 261 and a plurality of raised structures (for example, four raised structures 263, which is more clearly shown in FIG. 1). Four raised structures 263 are disposed on the inner side wall 2611 of the body 261, and each extend a predetermined length in the circumferential direction of the body 261. Four raised structures 263 are equally spaced and four channels 265 are defined in two adjacent ones. Between the raised structures 263.

In some embodiments, each protruding structure 263 includes a first portion 2631 and a second portion 2632 connected to the first portion 2631. In the direction of the vertical optical axis O (FIG. 1), the height of the first portion 2631 is greater than the height of the second portion 2633. For example, the first portion 2631 has a height H1, the second portion 2633 has a height H2, and the height H1 is greater than the height H2.

In addition, in a direction perpendicular to the optical axis O, the distance between the top surface of the first portion 2631 and the upper edge 2613 of the body 261 is smaller than the distance between the top surface of the second portion 2632 and the upper edge 2613 of the body 261. For example, the first portion 2631 is aligned with the upper edge 2613 of the main body 261, and the second portion 2632 is separated from the upper edge 2613 of the main body 261 by a distance D1. In addition, the bottom surface of the first portion 2631 is aligned with the bottom surface of the second portion 2632 and is spaced from the lower side edge 2612 of the body 261.

According to some embodiments of the present disclosure, the structural features of the lens assembly 3 are described as follows.

FIG. 3A shows a perspective view of the lens assembly 3, and FIG. 3B shows a side view of the lens assembly 3. In some embodiments, the lens assembly 3 includes a lens holder 31, a lens unit 34, and a plurality of engaging portions (for example, four engaging portions 36). The lens holder 31 is used for accommodating the lens unit 34 and includes a front cover 32 and a side cover 33. An opening 320 is defined in the center of the front cover 32. The side cover 33 extends from the edge of the front cover 32 toward the front cover 32 in the distance.

As shown in FIG. 3B, the side cover 33 includes a plurality of ring portions such as the ring portions 331, 333, and 335, and a plurality of connection portions such as the connection portions 332 and 334. The ring portions 331, 333, and 335 are each provided around the optical axis O of the lens unit 34, and extend substantially in a direction parallel to the optical axis. For convenience of explanation, in this embodiment, the annular portion 331 is referred to as a “first annular portion”, the annular portion 333 is referred to as a “second annular portion”, and the annular portion 335 is referred to as a “third annular portion”.

In a direction perpendicular to the optical axis O, the width of the first annular portion 331 is larger than the width of the second annular portion 333, and the width of the second annular portion 333 is larger than the width of the third annular portion 331. The connecting portion 332 is connected between the first annular portion 331 and the second annular portion 333, and an included angle greater than 0, such as 90 degrees, is formed with the first annular portion 331 and the second annular portion 333, respectively. The connecting portion 334 is connected between the second ring-shaped portion 333 and the third ring-shaped portion 335, and an angle greater than 0 is set with the second ring-shaped portion 333 and the third ring-shaped portion 335, for example, 45 degrees.

FIG. 4 is a schematic cross-sectional view of a lens assembly 3 according to some embodiments of the present disclosure. In some embodiments, the lens unit 34 is disposed in the lens holder 31 and includes a plurality of lenses, such as lenses 341, 342, 343, and 344, which are sequentially disposed in a direction away from the front cover 32. The optical axes of the lenses 341, 342, 343, and 344 pass through the openings 320 of the front cover 32, respectively, and the lenses further away from the front cover 32 have a larger width in the direction of the vertical optical axis O.

Continuing to refer to FIG. 4, and referring to FIGS. 2, 3A, and 3B, the four engaging portions 36 extend from the side cover 33 in a direction perpendicular to the optical axis O, respectively. Among them, the four engaging portions 36 and the front cover 32 The distances are the same, and the four engaging portions 36 are arranged at equal intervals in the circumferential direction. In some embodiments, the four engaging portions 36 are disposed at positions of the second annular portion 333 closer to the connecting portion 334. In the embodiment shown in FIGS. 3A and 3B, the four engaging portions 36 are disposed adjacent to the connecting portion 334 and are separated from the connecting portion 332 by a distance D2. The distance D2 may be greater than or equal to the height H2 of the second portion 2633 of the raised structure 263 (FIG. 2).

In some embodiments, in the direction perpendicular to the optical axis O, the extension lengths of the four engaging portions 36 are equal to or smaller than the difference between the widths of the first annular portion 331 and the second annular portion 333. That is, the positions of the ends of the four engaging portions 36 do not exceed the extension line segment R1 of the first annular portion 331 in the direction of the parallel optical axis O, as shown in FIG. 4.

In some embodiments, in the direction perpendicular to the optical axis O, the extension length of the four engaging portions 36 is equal to or less than the thickness of the convex structure 2633 (FIG. 2). In addition, in the direction parallel to the optical axis O, the height of the four engaging portions 36 is equal to or smaller than the distance D1 between the second portion 2632 of the convex structure 2633 (FIG. 2) and the upper side edge 2613 of the body 261.

In some embodiments, at least a part of the projection of the four engaging portions 36 in the direction of the parallel optical axis O is located on at least one lens of the lens unit 34. For example, in the embodiment shown in FIG. 4, the projections of the four engaging portions 36 in the direction of the parallel optical axis O completely fall on the lens 344, and the four engaging portions 36 are more lenses. 344 is near the front cover 32. In some non-limiting embodiments, a part of the projection of the four engaging portions 36 in the direction of the parallel optical axis O falls on the optically effective surface of the lens 344 (the curved surface of the lens 344).

Referring to FIGS. 5 and 6, the steps of combining the lens assembly 3 with the lens holder 26 are described below. First, the engaging portion 36 of the lens component 3 is inserted into the channel 265 defined between the adjacent protruding structures 263 until the connecting portion 332 of the lens component 3 abuts the lower side edge 2612 of the protruding structure 263. Next, rotate the lens assembly 3 in the direction shown by the arrow a in FIG. 5 so that the engaging portion 36 enters between the second portion 2632 of the convex structure 263 and the upper edge 2613 of the main body 261 until the engaging portion 36 abuts. The first portion 2631 of the protruding structure 263 is shown in FIG. 6.

In some embodiments, since the distance D2 (FIG. 3B) is equal to the height H2 (FIG. 2) of the second portion 2633 of the raised structure 2633, the second portion 2632 of the raised structure 263 is closely fitted to the connecting portion 332. The lens unit 3 is securely disposed on the lens holder 26 between the lens unit 3 and the engaging portion 36.

It should be understood that the disclosure is not limited to the above embodiments. In other embodiments, the distance D2 (FIG. 3B) is greater than the height H2 (FIG. 2) of the second portion 2633 of the protruding structure 2633. When the engaging portion 36 enters between the second portion 2632 of the raised structure 263 and the upper side edge 2613 of the body 261, a colloid can be coated in the channel 265 to limit the movement of the lens assembly 3 relative to the lens base 26, and further The lens assembly 3 is fixed in position.

Referring to FIG. 4, in the above embodiment, the lens assembly 3 is combined with the lens holder 26 through the engaging portion 36. The distance between the end of the engaging portion 36 and the optical axis O is less than half the maximum width of the lens holder 31 in the vertical optical axis O. Therefore, the width of the lens assembly 3 is smaller than the width of the lens assembly in which a screw portion is formed in the conventional technology. On the other hand, since the engaging portion 36 is supported by the convex structure 263, the lens assembly 3 does not tilt relative to the lens holder 26, thereby improving the image quality of the photographing device 1.

It should be understood that the form of the lens assembly 3 of the present disclosure is not limited to the above-mentioned embodiments, and various exemplary embodiments of the lens assembly of the present disclosure are presented below.

FIG. 7A shows a perspective view of the lens unit 3a, FIG. 7B shows a side view of the lens unit 3a, and FIG. 8 shows a schematic cross-sectional view of the lens unit 3a. In the embodiments shown in Figs. 7A, 7B, and 8, features that are the same as or similar to the embodiments shown in Figs. 3A, 3B, and 4 will be given the same reference numerals, and their features will not be described again to simplify. Description.

In this embodiment, the lens assembly 3a includes a lens holder 31, a lens unit 34, and a plurality of engaging portions (for example, four engaging portions 36a). For convenience of explanation, in this embodiment, the annular portion 333 is referred to as a “first annular portion”, and the annular portion 335 is referred to as a “second annular portion”.

The four engaging portions 36a extend from the side cover 33 in a direction perpendicular to the optical axis O, respectively. Among them, the four engaging portions 36a are at the same distance from the front cover 32, and the four engaging portions 36a are arranged at equal intervals in the circumferential direction. In some embodiments, the four engaging portions 36 a are disposed at positions of the second annular portion 335 closer to the front cover 32. In the embodiment shown in FIGS. 7 to 8, the four engaging portions 36 a are disposed adjacent to the front cover 32 and are spaced apart from the connecting portion 334 by a distance.

In some embodiments, in the direction perpendicular to the optical axis O, the extension lengths of the four engaging portions 36 a are equal to or smaller than the difference between the widths of the first annular portion 333 and the second annular portion 335. That is, the positions of the ends of the four engaging portions 36a do not exceed the extension line segment R2 of the first annular portion 333 in the direction of the parallel optical axis O, as shown in FIG. 8.

In some embodiments, at least a part of the projection of the four engaging portions 36 a in the direction of the parallel optical axis O is located on at least one lens of the lens unit 34. For example, in the embodiment shown in FIG. 8, the projections of the four engaging portions 36 a in the direction of the parallel optical axis O completely fall on the lens 344, and the four engaging portions 36 a are more than the lens. 344 is near the front cover 32. In addition, the projections of the four engaging portions 36 a in the direction parallel to the optical axis O are located on the lens 343, and the four engaging portions 36 a are closer to the front cover 32 than the lens 343. In a partially non-limiting embodiment, a part of the projection of the four engaging portions 36a in the direction of the parallel optical axis O completely falls on the optically effective surface of the lens 344 (the curved surface of the lens 344).

FIG. 9A shows a perspective view of the lens assembly 3b, FIG. 9B shows a side view of the lens assembly 3b, and FIG. 10 shows a schematic sectional view of the lens assembly 3b. In the embodiments shown in Figs. 9A, 9B, and 10, the same or similar features as those in the embodiments shown in Figs. 3A, 3B, and 4 will be given the same reference numerals, and their features will not be described again to simplify. Description.

The lens assembly 3b includes a lens holder 31b, a lens unit 34, and a plurality of engaging portions (for example, four engaging portions 36b). Compared with the lens holder 31, the lens holder 31 b further includes a connecting portion 336 and an annular portion 337. The ring portion 337 is provided around the optical axis O of the lens unit 34 and extends substantially in a direction parallel to the optical axis. The width of the ring portion 331 is greater than the width of the ring portion 337, and the ring portion 337 is connected to the side of the ring portion 331 away from the front cover 32 through the connection portion 336. The connecting portion 336 and the annular portion 331 and the annular portion 337 respectively include an included angle greater than 0, for example, 90 degrees. For convenience of explanation, in this embodiment, the annular portion 331 is referred to as a “first annular portion”, and the annular portion 337 is referred to as a “second annular portion”.

The four engaging portions 36b extend from the side cover 33b in a direction perpendicular to the optical axis O, respectively. The four engaging portions 36b are at the same distance from the front cover 32, and the four engaging portions 36b are arranged at equal intervals in the circumferential direction. Specifically, the four engaging portions 36 b are provided at positions where the second annular portion 337 is far from the front cover 32. In the embodiment shown in FIGS. 9-10, the four engaging portions 36b are disposed immediately adjacent to the end of the side cover 33b away from the front cover 32, and are spaced apart from the connecting portion 336 by a distance.

In some embodiments, in the direction perpendicular to the optical axis O, the extension lengths of the four engaging portions 36b are equal to or smaller than the difference between the widths of the first annular portion 331 and the second annular portion 337. That is, the positions of the ends of the four engaging portions 36b do not exceed the extension line segment R3 of the first annular portion 331 in the direction of the parallel optical axis O, as shown in FIG. 10.

In some embodiments, at least a part of the projection of the four engaging portions 36 b in the direction of the parallel optical axis O is located on at least one lens of the lens unit 34. For example, in the embodiment shown in FIG. 10, the projections of the four engaging portions 36b in the direction of the parallel optical axis O fall on the lens 344, and the four engaging portions 36b are more than the lens. 344 is far from the front cover 32.

Although the present disclosure has been disclosed above with a preferred embodiment, it is not intended to limit the present disclosure. Those with ordinary knowledge in the technical field to which this disclosure belongs may make some changes without departing from the spirit and scope of this disclosure. And retouching, so the scope of protection of this disclosure shall be determined by the scope of the attached patent application.

Claims (10)

    A lens assembly includes: a lens holder including a front cover and a side cover extending from an edge of the front cover, wherein an opening is defined in the front cover; a lens is provided in the lens holder Pieces, aligning the optical axis of the lens with the opening; and an engaging portion protruding outward from the side cover, wherein the projection of the engaging portion in a direction parallel to the optical axis is located on the lens.         The lens assembly according to item 1 of the patent application scope, wherein the engaging portion is closer to the light incident surface of the lens assembly than the lens.         The lens assembly according to item 2 of the patent application scope, wherein the engaging portion is adjacent to the front cover.         The lens assembly according to item 1 of the patent application scope, wherein the engaging portion is farther from the light incident surface of the lens assembly than the lens.         The lens assembly according to any one of claims 1 to 4, wherein the side wall includes: a first annular portion; and a connecting portion that connects a side of the first annular segment portion near the front cover. And a second annular portion connected to the first annular portion via the connecting portion, wherein a width of the second annular segment portion is smaller than a width of the first annular segment portion in a direction perpendicular to the optical axis; wherein The engaging portion is disposed on the second annular portion and is spaced apart from the connecting portion by a distance.         The lens assembly according to any one of claims 1 to 4, wherein the side wall includes: a first annular portion; and a connecting portion that connects the side of the first annular segment away from the front cover. And a second annular portion connected to the first annular portion via the connecting portion, wherein a width of the second annular segment portion is smaller than a width of the first annular segment portion in a direction perpendicular to the optical axis; wherein The engaging portion is disposed on the second annular portion and is spaced apart from the connecting portion by a distance.         The lens assembly according to any one of claims 1 to 4 of the scope of patent application, which includes a plurality of fixing portions, and the fixing portions are circumferentially disposed on the sidewall.         The lens assembly according to any one of claims 1 to 4, wherein a projection of the engaging portion in a direction parallel to the optical axis is located on an optically effective surface of the lens.         A photographing device includes: a lens holder including a front cover and a side cover extending from an edge of the front cover, wherein an opening is defined in the front cover; a lens is provided in the lens holder Aligning the optical axis of the lens with the opening; an engaging portion protruding outward from the side cover, wherein the projection of the engaging portion in a direction parallel to the optical axis is located on the lens; and an image sensing side A component disposed along the optical axis of the lens and configured to receive light passing through the lens.         The photographing device according to item 9 of the scope of patent application, further comprising: a mirror base, including a body provided around the side cover and a raised structure formed on an inner wall surface of the body, wherein the engaging portion abuts The projection structure is used to fix the lens assembly on the lens holder; a driving coil is disposed on the body of the lens holder; and a driving magnet is disposed opposite to the driving coil.