TW201403202A - Lens focusing device - Google Patents

Abstract

A lens focusing device comprises: a hollow and cylindrical lens carrier base for receiving a lens therein; a coil covering the circumference of the lens carrier base; and an outer cover covering the circumference of the lens carrier base and having an outer wall part, an inner wall part and a connection part. The inner wall part is sandwiched between the lens carrier base and the coil. The connection part is connected between the outer wall part and the inner wall part. The inner wall part comprises an inner surface facing the lens carrier base, an outer surface facing the coil, and a first side and a second side connected to the inner surface and the outer surface. The circumference of the lens carrier base is provided with a limiting part, which includes a main surface opposite to the inner surface, a first protruded surface opposite to the first side, and a second protruded surface opposite to the second side, for limiting the operation space of the inner wall part, thereby providing a lens focusing device capable of resisting impact or preventing twisting.

Description

Lens focusing device

The present invention relates to a lens focusing device, and more particularly to a lens focusing module for taking images such as a mobile phone, a camera, and the like.

The general lens focusing device can be used as a device for autofocusing when capturing images on a handheld device such as a mobile phone, a camera, a tablet computer, a notebook computer, and a network camera.

At present, such lens focusing devices have been related to improving the shape of the lens holder or the cover, for example, to design the lens carrier and the cover for easier lens assembly of the lens carrier, or to ensure a wider assembly space for the lens. , and improve the octagonal coil structure and the construction of the outer cover and the like.

However, the current lens focusing device maintains the elasticity of the lens carrier with a spring, and when subjected to an external impact force, a collision between the lens carrier and the peripheral component occurs, and damage occurs.

In addition, the lens mount and the lens are mostly fixed by a threaded lock, and the lens carrier is only kept in a movable state by the upper and lower elastic pieces. When the lens is screwed into the lens carrier, the rotation may be improperly applied. Causes excessive twisting of the lens carrier to damage the upper and lower shrapnel.

Therefore, in view of the foregoing actual situation, there is a need for a lens focusing device that has impact resistance and anti-twist.

The present invention provides an impact-resistant, anti-twist-resistant lens focusing device based on the above needs.

The embodiment of the invention provides a lens focusing device, comprising: a lens carrier capable of accommodating a lens in a hollow cylinder; a coil disposed at a periphery of the lens carrier; and a cover covering the periphery of the lens carrier, the outer cover having an outer wall portion, An inner wall portion and a connecting portion, the inner wall portion is sandwiched between the lens carrier and the coil, and the connecting portion is connected between the outer wall portion and the inner wall portion; wherein the inner wall portion has an inner surface facing the lens carrier and facing the coil An outer surface, a first side surface and a second side surface connected to the inner surface and the outer surface; wherein the outer periphery of the lens carrier forms a restricting portion, the limiting portion includes a main surface, a first protruding surface and a second protruding surface, the main surface and the inner wall The inner surface of the portion is opposite and located between two adjacent coil setting portions, the first protruding surface is located at one side end of the main surface, opposite to the first side surface of the inner wall portion, and the second protruding surface is located on the other side of the main surface The end portion is opposite to the second side surface, and the restricting portion can limit the movable space of the inner wall portion.

According to the lens focusing device provided by the embodiment of the present invention, when the external force is impacted, the restriction portion around the lens carrier contacts the inner wall portion of the outer cover and is restricted, and the inner wall portion absorbs the external force applied to the lens focusing device. The invention can effectively limit the shaking of the external impact belt to the lens carrier to prevent the lens focusing device from being damaged, and when the lens is screwed into the lens carrier, the restriction portion also limits the torsion of the lens carrier due to the inner wall portion, so the present invention Lens focusing The device can prevent the lens carrier from tilting or rotating due to external force, thereby preventing deformation of the lens carrier and damage of the elastic member.

In the embodiment of the present invention, the inner surface of the inner wall portion corresponding to the main surface of the restricting portion is planar, so that the gap between the inner wall portion and the lens bearing seat and the coil can be accurately controlled without affecting the voice coil. The driveability of the motor and the design that is more advantageous for miniaturization due to the control of the gap.

In the embodiment of the present invention, the first protruding surface and the second protruding surface of the restricting portion correspond to the first side surface and the second side surface of the inner wall portion, such that the first side surface and the second side surface of the inner wall portion are subjected to the first protruding surface and The second protruding surface forms a limited range, and has better impact resistance, effectively preventing deformation or twist of the lens carrier due to external force impact.

In the practice of the present invention, there are an even number of symmetrically arranged connecting portions and inner wall portions, and the restricting portions on the periphery of the lens carrier are also the same as the inner wall portions. Such an even number of symmetrical inner wall portions can balance the movement of the lens holder, and can also effectively absorb external force impact and torsion resistance due to contact between the restricting portion and the inner wall portion.

The above described features and advantages of the present invention will be more apparent from the following description.

Please refer to FIG. 1 , which is a perspective view of a lens focusing device according to an embodiment of the present invention. As shown in the embodiment of FIG. 1, the lens focusing device 10 has a slight A rectangular appearance. The lens focusing device 10 has a lens holder 50 in a hollow cylindrical shape, the center of which can accommodate a lens (not shown), and has a cover 40 surrounding the lens carrier 50 and a base on the periphery of the lens carrier 50. Bottom 70.

Referring to FIG. 1 and FIG. 2 together, FIG. 2 is a perspective exploded view of FIG. 1. In the embodiment of FIG. 2, the lens focusing device 10 further has an upper cover 20 and a bottom 70, so that the lens carrier 50 can be kept opposite. Focus moves. A voice coil motor is provided inside the lens focusing device 10, and the voice coil motor allows the lens carrier 50 to perform a focusing movement with respect to the bottom portion 70 along the optical axis α direction. After the image sensor is disposed on the light emitting side of the lens focusing device 10, it can be used as a camera module having a focusing mechanism, but the purpose of the lens focusing device 10 of the present invention is not limited thereto.

In the embodiment of FIG. 2, the lens focusing device 10 includes a housing 40, an upper cover 20, an upper spring 30, a lens carrier 50, a magnet 44, a coil 48, a lower spring 60, a bottom portion 70, and a connection terminal 80. On the other hand, the lens focusing device 10 is referred to as the incident side on the side of the light intake lens along the optical axis α of the lens, and the side on which the light is emitted is referred to as the exit side.

The outer cover 40 is made of a soft magnetic material such as iron, and the magnetic flux of the magnet 44 passes through the conductive material of the coil 48. In the lens focusing device 10 of the present embodiment, the outer cover 40 is surrounded by the outer cover 20 and the bottom portion 70, and the outer cover 40 further includes an outer wall portion 41, an inner wall portion 43 sandwiched between the outer wall portion 41 and the coil 48, and The connecting portion 42 between the outer wall portion 41 and the inner wall portion 43 is continued. However, in the present invention, the outer cover 40 is not limited in shape, as long as the upper cover 20 and the bottom portion 70 can be enclosed inside, and the magnet 44 can be used. It consists of several components.

The upper cover 20 is connected to the upper spring 30, and the upper spring 30 supports the upper portion of the lens carrier 50. The upper cover 20 has a frame-shaped upper cover frame portion 22 and an upper cover column portion 24. In the present embodiment, the upper cover column portion 24 is provided on the exit side surface of the upper cover frame portion 22, and protrudes toward the exit side along the optical axis α direction. The exit side surface of the upper cover frame portion 22 is the upper spring installation surface 22a, and the upper spring is disposed. The surface 22a may be fixed to the outer ring portion 32 of the upper spring 30 by an adhesive or the like, and the upper cover column portion 24 of the upper cover 20 may be bonded and fixed to the bottom column portion 74 of the bottom portion 70 by an adhesive or the like. The upper cover column portion 24 and the bottom column portion 74 are the same number, but may be any number, are not limited to the four of the embodiment, and are not limited to the four corners.

As shown in the embodiment of FIG. 2, the upper spring 30 is elastically coupled between the upper cover 20 and the lens carrier 50. The lens carrier 50 is elastically supported on the optical axis by an upper spring 30 connected by the upper cover 20 and a lower spring 60 connected to the bottom 70. In the extending direction of α, the focus moves freely along the optical axis α direction.

The upper spring 30 is a multi-ring formed by the outer ring portion 32, the inner ring portion 34, and the arm portion 36. The outer ring portion 32 is the outer periphery of the upper spring 30, and the outer ring portion 32 is connected to the upper spring setting surface 22a of the upper cover frame portion 22. The inner ring portion 34 is located inside the outer ring portion 32, and the inner ring portion 32 can be connected to the incident side inner ring setting portion 53 of the lens mount 50 by an adhesive or the like. The arm portion 36 is continuous between the outer ring portion 32 and the inner ring portion 34.

The upper spring 30 is made of an elastic material such as metal, and the arm portion 36 is elastically deformed so that the inner ring portion 34 can relatively move in the direction of the optical axis α with respect to the outer ring portion 32.

The magnet 44 is clamped to the outside of the coil by the upper cover frame portion 22 of the upper cover 20 and the bottom frame portion 72 of the bottom portion 70. In the present embodiment, the magnet 44 is located inside the upper cover post portion 24 and the bottom post portion 74, and is disposed at four corners of the lens focusing device 10. The number of magnets 44 of the present invention may be any number, and is not limited by the number and arrangement positions of the present embodiment.

In the assembled state, the magnet 44 is assembled on the outside of the lens carrier 50 opposite to the coil 48 (as shown in FIG. 6). In this embodiment, the voice coil motor that drives the lens carrier 50 is composed of a magnet 44. The cover 40 and the coil 48 are formed.

The coil 48 is disposed at the outer periphery 50a of the lens holder 50, and is fixed to the coil setting portion 52 formed by the projection of the outer periphery 50a. The two ends of the coil 48 are electrically connected to at least two inner ring portions 64 from which the lower spring 60 is separated, and current can be communicated therebetween. As shown in the embodiment of FIG. 5, at least two outer ring portions 62 of the lower spring 60 are separated from each other, but are electrically connected to the inner ring portion 64 and the connection terminal 80, respectively, and can be electrically connected to each other. Therefore, as shown in the embodiment of FIG. 2, the coil 48 is electrically connected to the lower spring 60, and is electrically connected to the connection terminal 80 by the lower spring 60. The connection terminal 80 can provide the power of the coil 48 to drive the lens carrier 50. The lower spring 60 is composed of at least two components 60a and 60b that are separated and insulated from each other.

An incident side inner ring setting portion 53 is provided at one end on the incident side of the lens mount 50, and is connected to the inner ring portion 34 of the upper spring 30, and an exit side inner ring setting portion 54 is provided at one end on the exit side of the lens mount 50, and is connected. The inner ring portion 64 of the spring 60 is lowered.

As shown in the embodiment of FIG. 2, the lower spring 60 is elastically connected to the bottom. Between 70 and lens carrier 50, at least two components 60a and 60b of lower spring 60 provide a portion of the power wiring of coil 48, respectively. The lower spring 60 is composed of at least two separate components, and its configuration is similar to that of the upper spring 30 by the outer ring portion 62, the inner ring portion 64 and the arm portion 66.

The outer ring portion 62 of the lower spring 60 is connected to the lower spring setting surface 72a of the incident side surface of the bottom frame portion 72, the inner ring portion 64 of the lower spring 60 is located inside the outer ring portion 62, and the inner ring portion 64 may be connected by an adhesive or the like. An exit side inner ring setting portion 54 of the lens carrier 50. The outer ring portion 62 and the inner ring portion 64 of the lower spring 60 are connected by the arm portion 66.

The lower spring 60 is the same as the upper spring 30 and is made of an elastic material such as metal. The arm portion 66 is elastically deformable so that the inner ring portion 64 can move relative to the outer ring portion 62 in the direction of the optical axis α . Therefore, the lens holder 50 can be moved in a relative focus along the optical axis α direction by the lower spring 60 connected to the bottom portion 70 and the upper spring 30 connected to the upper cover 20.

In the present embodiment, the center portion of the bottom portion 70 is provided with a through hole, and the outer peripheral edge of the bottom portion 70 has a bottom frame portion 72 having a rectangular shape, and the bottom portion of the bottom frame portion 72 has a bottom pillar portion 74 that projects toward the incident side. . The bottom portion 70 of the present invention may have other shapes, which are not limited by the rectangular shape of FIG. 2, and the number and position of the bottom pillar portions 72 correspond to the upper cover pillar portion 24, and are not limited to the number and position of FIG.

The surface on the incident side of the bottom frame portion 72 is a lower spring installation surface 72a. The lower spring setting surface 72a can be disposed to connect the outer ring portion 62 of the lower spring 60, and at least one outer side surface of the bottom frame portion 72 has a receiving groove 76 for assembling and placing the connecting terminal 80.

The function of the connection terminal 80 is as a power supply terminal, and external power can be supplied to the voice coil motor of the lens focus device 10. In other words, one end of the connection terminal 80 is electrically connected to the outer ring portion 62 of the lower spring 60, and the other end of the connection terminal 80 is electrically connected to an external substrate or the like (not shown).

Referring to the embodiment of FIGS. 3 to 6, the detailed configuration between the outer cover 40 and the lens carrier 50 will be described. 3 is an exploded perspective view of the outer cover and the lens carrier. In the embodiment of FIG. 3, the outer wall portion 41 of the outer cover 40 extends in the direction of the optical axis α , and has a rectangular hollow shape, and the connecting portion 42 is disposed at The four corners on the incident side of the outer wall portion 41 extend from the corner of the outer wall portion 41 toward the center optical axis α to the inner wall portion 43, and are continued between the outer wall portion 41 and the inner wall portion 42. However, the outer cover 40 of the present invention is not limited to a rectangular shape, and the joint portion 42 may have any number corresponding to the inner wall portion 43, and is not limited by the number and position of the third embodiment.

The inner wall portion 43 of the outer cover 40 extends in the direction of the exit side by the joint portion 42, the inner wall portion 43 is closer to the center optical axis α than the outer wall portion 41, and the coil 48 and the magnet are interposed between the inner wall portion 43 and the outer wall portion 41. 44 (shown in Fig. 6), in the present embodiment, the inner wall portion 43 has a rectangular flat plate shape, but is not limited to a rectangular shape.

The inner wall portion 43 has an inner surface 43a facing the central optical axis α , an outer surface 43b facing the outer wall portion 41, and a first side surface 43c and a second side surface 43d that are in contact with the inner surface 43a and the outer surface 43b.

The inner surface 43a of the inner wall portion 43 faces the lens holder 50, and corresponds to the main surface 56 of the restricting portion 55 formed by the outer periphery 50a. The outer surface 43b of the inner wall portion 43 faces the direction of the coil 48 (as shown in Fig. 6). In this embodiment, the lens pair The inner surface 43a and the outer surface 43b of the inner wall portion 43 of the focusing device 10 are all planar.

Referring to FIG. 3 and FIG. 4 together, FIG. 4 is a schematic plan view showing the arrangement position of the outer cover and the lens carrier of FIG. 3, and the outer periphery 50a of the lens carrier 50 is formed corresponding to the inner wall portion 43 of the outer cover 40. In the present embodiment, the restricting portion 55 has a main surface 56 and a first protruding surface 57 and a second protruding surface 58 that sandwich both sides of the main surface 56. The first protruding surface 57 corresponds to the inner wall portion 43. One side surface 43c, the second protruding surface 58 corresponds to the second side surface 43d of the inner wall portion 43.

Referring to the embodiment of FIG. 4, the first protruding surface 57 of the restricting portion 55 is formed by one side end of the main surface 56 protruding away from the central optical axis α , and the first portion of the inner wall portion 43. The side faces 43c correspond. The second projecting surface 58 is formed by projecting the other end of the main surface 56 in a direction away from the central optical axis α , and is opposed to the second side surface 43d of the inner wall portion 43.

As shown in FIG. 3, the restricting portion 55 of the lens carrier 50 has a first protruding surface 57 corresponding to the second protruding surface 58, and the first protruding surface 57 is connected to the side end of the adjacent coil setting portion 52. The two protruding faces 58 are connected to the side ends of the adjacent coil setting portions 52.

The inner circumference of the coil 48 may contact or be close to the coil setting portion 52 of the periphery 50a of the lens holder 50. The coil setting portion 52 protrudes from the periphery 50a of the lens holder 50, and has a notch 52a cut therein, and the coil 48 can be adhered or connected to the cut notch 52a by an adhesive or the like, so that the coil 48 can be firmly connected to the lens holder 50.

As shown in the embodiment of FIG. 4 and FIG. 5, FIG. 5 is the figure V along the V-V. A cross-sectional view of the cross section of the wire, the inner wall portion 43 of the outer cover 40 and the restricting portion 55 of the lens carrier 50 are arranged in pairs, and when the external force is impacted, the restricting portion 55 of the lens carrier 50 contacts the inner cover 40. The wall portion 43 restricts the movable space of the lens holder 50 and absorbs the impact force applied to the lens focusing device 10. Therefore, the lens focusing device of the present invention has good impact resistance.

In the present embodiment, the inner surface 43a, the first side surface 43c, and the second side surface 43d of the inner wall portion 43 of the outer cover 40 are respectively received by the main surface 56, the first protruding surface 57, and the corresponding portion of the restricting portion 55 of the lens carrier 50. The limitation of the two protruding faces 58.

Referring to FIG. 4 and FIG. 6 together, FIG. 6 is a cross-sectional view along the line VI-VI of FIG. 1. The main surface 56 of the restricting portion 55 faces the inner surface 43a of the inner wall portion 43. A gap a is interposed between the main surface 56 and the inner surface 43a. When the external force or the like causes the lens carrier 50 to tilt, or when the lens carrier 50 is twisted in parallel due to the screwing into the lens, the main surface 56 of the restricting portion 55 is inside and outside. The surface 43a is in contact, so that the tilt or parallel twist of the lens holder 50 can be restricted, so that the impact or twist generated by the collision can be absorbed.

Further, since the inner surface 43a of the inner wall portion 43 is planar, the gap between the inner wall portion 43 and the lens holder 50 and the coil 48 can be precisely controlled to improve the driving performance of the voice coil motor. As shown in Fig. 6, the gap a between the inner surface 43a of the inner wall portion 43 and the main surface 56 of the lens holder 50 is smaller than the gap b between the outer surface 43b of the inner wall portion 43 and the coil 48. Therefore, reducing the gap between the inner wall portion 43 and the lens holder 50 contributes to miniaturization of the lens focusing device 10.

In the embodiment shown in FIG. 4, the outer cover 40 has four connecting portions 42 and inner wall portions 43, respectively disposed at a position of the outer cover 40 at an angle of 90 degrees around the optical axis, and is connected to the outer wall portion 41 of the outer cover 40. The four restricting portions 55 of the lens holder 50 are opposite to the four inner wall portions 43 at the outer periphery 50a of the lens holder 50, and are disposed evenly around the optical axis α , so that the movement of the lens holder 50 is performed. It can be balancedly restricted to absorb the force caused by the impact of the restricting portion 55 and the inner wall portion 43.

Further, in the embodiment of FIG. 5, the first protruding surface 57 of the restricting portion 55 is opposed to the first side surface 43c of the inner wall portion 43, with a slight gap therebetween, and the second protruding surface 58 and the second portion of the inner wall portion 43 The side faces 43d are opposite and have a slight gap therebetween; when the lens carrier 50 is rotated by an external force, when the lens carrier 50 is screwed into the lens, the first side face 43c of the inner wall portion 43 may be in contact with the first projecting surface 57 or The second side surface 43d is in contact with the second protruding surface 58, so that the rotation of the lens carrier 50 can be restricted. The first protruding surface 57 and the second protruding surface 58 can relatively restrict the range of movement of the first side surface 43c and the second side surface 43d of the inner wall portion 43, so that the external force impact can be effectively prevented and the lens carrier 50 can be prevented from being deformed.

The lens focusing device 10 of the above embodiment can also be used as an optical device having a focusing mechanism and correcting vibration. The detailed shape of the outer cover 40, the lens mount 50, and the like can be appropriately changed in accordance with the shape of other components.

The present disclosure has been disclosed in the above embodiments, but it is not intended to limit the disclosure, and any one of ordinary skill in the art can make some changes and refinements without departing from the spirit and scope of the disclosure. The scope of protection of this disclosure is subject to the definition of the scope of the patent application.

10‧‧‧ lens focusing device

20‧‧‧Upper cover

22‧‧‧Top cover frame

22a‧‧‧Upper spring setting surface

24‧‧‧Upper column

30‧‧‧Up spring

60‧‧‧ Lower spring

60a‧‧‧ Lower spring assembly

60b‧‧‧ Lower spring assembly

32, 62‧‧‧Outer Rings

34, 64‧‧‧ Inner Ring Department

36, 66‧‧‧ Arms

40‧‧‧ Cover

41‧‧‧Outer wall

42‧‧‧Continuation Department

43‧‧‧Inside wall

43a‧‧‧ inner surface

43b‧‧‧ outer surface

43c‧‧‧ first side

43d‧‧‧ second side

44‧‧‧ magnet

48‧‧‧ coil

50‧‧‧Lens carrier

50a‧‧‧ periphery

52‧‧‧Coil setting department

52a‧‧ cut gap

53‧‧‧Injection side inner ring setting section

54‧‧‧Injection side inner ring setting section

55‧‧‧Restrictions

56‧‧‧Main face

57‧‧‧First prominent surface

58‧‧‧second protruding surface

70‧‧‧ bottom

72‧‧‧ bottom frame

72a‧‧‧ Lower spring setting surface

74‧‧‧ bottom column

76‧‧‧ Storage ditch

80‧‧‧Connecting terminal

α ‧‧‧ optical axis

FIG. 1 is a perspective view of a lens focusing device according to an embodiment of the present invention.

Figure 2 is a perspective exploded view of Figure 1.

FIG. 3 is a perspective exploded view of the outer cover and the lens carrier.

Figure 4 is a plan view showing the arrangement position of the combination of Figure 3.

Figure 5 is a cross-sectional view of the cross section taken along line V-V of Figure 4.

Figure 6 is a cross-sectional view of the cross section taken along line VI-VI of Figure 1.

40‧‧‧ Cover

41‧‧‧Outer wall

42‧‧‧Continuation Department

43‧‧‧Inside wall

43a‧‧‧ inner surface

43b‧‧‧ outer surface

43c‧‧‧ first side

43d‧‧‧ second side

50‧‧‧Lens carrier

50a‧‧‧ periphery

52‧‧‧Coil setting department

52a‧‧ cut gap

53‧‧‧Injection side inner ring setting section

54‧‧‧Injection side inner ring setting section

55‧‧‧Restrictions

56‧‧‧Main face

57‧‧‧First prominent surface

58‧‧‧second protruding surface

Claims (5)

A lens focusing device includes: a lens carrier that carries a lens to move along an optical axis, and a periphery of the lens carrier is formed with at least one restriction portion; a coil is wrapped around the periphery of the lens carrier; and a cover Covering the outer side of the mirror carrier, the outer cover further includes: an outer wall portion, at least one connecting portion and at least one inner wall portion; wherein the connecting portion is connected between the outer wall portion and the inner wall portion, the inner portion The wall portion is sandwiched between the lens carrier and the coil, and the coil is located between the inner wall portion and the outer wall portion; wherein the inner wall portion corresponds to the restricting portion, and the limiting portion and the inner wall portion The space between the lens holders is restricted to prevent the lens carrier from being tilted or twisted by an external force. The lens focusing device of claim 1, wherein the lens carrier further comprises at least one coil setting portion connected to the coil, wherein the limiting portion is formed by two adjacent coil setting portions. The lens focusing device of claim 2, wherein the inner wall portion further comprises: an inner surface, an outer surface, and a first side and a second side connected to the inner surface and the outer surface The inner surface faces the lens carrier, the outer surface faces the coil; wherein the outer periphery of the lens carrier is further formed with at least one restricting portion corresponding to the inner wall portion, which limits the horizontal movement or twist of the lens carrier The restriction portion includes: a main surface corresponding to the inner surface; a first protruding surface is located at one side end of the main surface corresponding to the first side surface; and a second protruding surface is located at the other side end of the main surface corresponding to the second side surface. The lens focusing device of claim 1, wherein the inner surface, the outer surface, and the main surface of the restricting portion are all planar. The lens focusing device of claim 1, wherein the first protruding surface and the second protruding surface extend in a direction slightly parallel to the optical axis direction and are slightly parallel to each other.