TW201804210A - Lens driving mechanism and electronic device having the same - Google Patents

Abstract

A lens driving mechanism for moving a lens unit along a light axis is provided, including a frame, a base, a lens holder, and a driving assembly. The frame includes plastic material and forms an opening. The base is in contact with and fixed to the frame, wherein a space is formed between the base and the frame. The lens holder is movably disposed in the space for holding the lens unit, wherein light enters the space through the opening to the lens unit. The driving assembly is disposed in the space and connected to the lens holder and the frame, to impel the lens unit along the light axis.

Description

Lens drive mechanism and electronic device having the lens drive mechanism

The present invention relates to a lens driving mechanism, and more particularly to a lens driving mechanism having a plastic material outer frame.

A general-purpose mobile phone or tablet usually has a camera lens, which mainly includes a lens unit and a lens driving mechanism (such as a voice coil motor (VCM)) for driving the lens unit. Most of the mechanisms are provided with a driving assembly composed of a magnet and a coil, thereby driving the lens unit accommodated in the lens driving mechanism to move along the optical axis direction, thereby achieving the effect of autofocus.

Please refer to FIGS. 1A and 1B, wherein FIG. 1A shows a schematic diagram of a conventional voice coil motor 10 connected to a transparent plate G and a circuit board P, and FIG. 1B shows a cross-sectional view taken along line A-A of FIG. 1A. It can be seen from the drawings 1A and 1B that an outer frame 11 of the voice coil motor 10 is coupled with the base 13, and a lens carrier 12 is disposed in the accommodating space 101 formed by the outer frame 11 and the base 13, and an upper reed S1 connects the outer frame 11 and the lens carrier 12, and the lower reed S2 connects the base 13 and the lens carrier 12, so that the lens carrier 12 and the lens unit (not shown) accommodated therein can pass through the voice coil. The motor 10 is moved to move in the optical axis direction with respect to the outer frame 11 and the base 13. In addition, the transparent plate G is attached to the top surface 111 of the outer frame 11 to protect the lens unit and other parts inside the lens driving mechanism 10, and allows external light to pass through the transparent plate G. It enters the inside of the voice coil motor 10.

However, since the outer frame 11 of the voice coil motor 10 is mostly stamped with a magnetically conductive metal plate, and in view of the smaller and smaller size of the portable electronic device, the communication components inside the electronic device (such as an antenna or The wireless communication chip is easily affected by the metal frame 11 to reduce its performance. On the other hand, since the upper reed S1 has a flat shape, the upper frame 11 and the lens carrier 12 can be smoothly connected in order to enable the upper reed S1 to be smoothly connected. A recessed structure 112 (as shown in FIGS. 1A and 1B) is generally formed at four corners of the metal bezel 11 to facilitate the upper surface of the upper reed S1 and the lens carrier 12 and the lower surface of the recessed structure 112 ( Fig. 1B is connected, but this will make the bonding area between the top surface 111 of the outer frame 21 and the transparent plate G small, so as to affect the overall structural strength after assembly.

An embodiment of the present invention provides a lens driving mechanism for driving a lens unit to move along an optical axis direction, including an outer frame, a base, a lens carrier, and a driving assembly. The outer frame comprises a plastic material and has an opening, and the base is in contact with the outer frame and fixed to each other, wherein an accommodation space is formed between the outer frame and the base. The lens carrier is movably disposed in the accommodating space for carrying the lens unit, wherein an external light enters the accommodating space through the opening of the outer frame to reach the lens unit. The foregoing driving component is disposed in the accommodating space, and connects the lens carrier and the outer frame to drive the lens unit to move in the optical axis direction.

In an embodiment, the outer frame further has a protrusion, a top surface and a side surface extending from the edge of the top surface toward the base, the protrusion protruding from an inner side surface of the outer frame, and Corresponding to the abutment of the top surface and the side surface to enhance the structural strength of the outer frame.

In an embodiment, the top surface is quadrangular.

In an embodiment, the outer frame further comprises a metal material.

In an embodiment, the lens driving mechanism further includes a wire formed on the outer frame by a Molded Interconnect Device (MID) technology.

In one embodiment, the driving component includes a first magnetic component and a second magnetic component, wherein the first and second magnetic components are respectively disposed on the outer frame and the lens carrier, and the lens carrier borrows The magnetic force generated between the first and second magnetic elements moves relative to the outer frame and the base.

In one embodiment, the outer frame further has a clamping portion protruding from an inner side surface of the outer frame and restricting a predetermined position of the first magnetic member on the inner side surface.

In an embodiment, the clamping portion has a U-shaped structure, and the first magnetic component is received in the U-shaped structure.

In one embodiment, the first magnetic element is a magnet, and the second magnetic element is a coil to which an electric current can be applied.

In one embodiment, the first magnetic element comprises a multi-pole magnet.

In one embodiment, the lens carrier has a protruding slider, and the outer frame further has a limiting structure, wherein the slider is received in the limiting structure to limit the movement of the slider.

In an embodiment, the limiting structure has two limiting portions protruding from an inner side surface of the outer frame, wherein the limiting portions form a groove extending toward the optical axis, and the The width of the groove is greater than the width of the slider.

In one embodiment, the lens driving mechanism is substantially polygonal and further includes two driving components respectively disposed on opposite sides of the lens driving mechanism to drive the lens unit to move along the optical axis direction. The slider and the limiting structure are located on a side of the lens driving mechanism different from the driving components.

In one embodiment, the outer frame is substantially quadrangular and further has a body including a plastic material and a metal plate, wherein the opening is formed on the body, and the metal plate is disposed on one side of the body.

In one embodiment, the metal plate is formed with a plurality of holes, and the body is formed with a plurality of protrusions, wherein the protrusions are fitted into the holes.

In addition, the present invention further provides an electronic device comprising the lens driving mechanism, a housing and a wireless communication component as described above, wherein the lens driving mechanism is substantially polygonal, and the lens driving mechanism and the wireless communication component are both disposed In the housing, wherein the driving component is adjacent to a first side of the lens driving mechanism, the wireless communication component is adjacent to a second side of the lens driving mechanism, and the second side is different from the first side.

The above described objects, features and advantages of the present invention will become more apparent from the description of the appended claims.

10‧‧‧ voice coil motor

101, 201‧‧‧ accommodating space

11‧‧‧Front frame

111‧‧‧ top surface

112‧‧‧ recessed structure

12‧‧‧Lens carrier

13‧‧‧Base

20‧‧‧Lens drive mechanism

21‧‧‧Front frame

21’‧‧‧ Ontology

210‧‧‧Opening

211‧‧‧ top surface

212‧‧‧ side

213‧‧‧Bumps

22‧‧‧Lens carrier

220‧‧‧Perforation

221‧‧‧ Slider

23‧‧‧Base

24‧‧‧Metal plates

240‧‧‧ holes

M‧‧‧First magnetic component

C‧‧‧Second magnetic component

G‧‧‧Transparent board

L‧‧‧ optical axis

P‧‧‧PCB

R1‧‧‧ limit structure

R11‧‧‧Limited Department

R12‧‧‧ groove

R2‧‧‧ gripping department

R21‧‧‧ trench

S1‧‧‧Upper Reed

S2‧‧‧Reed

Fig. 1A is a view showing a conventional voice coil motor connected to a transparent plate and a circuit board.

Fig. 1B is a cross-sectional view taken along line A-A of Fig. 1A.

Fig. 2 is an exploded view showing a lens driving mechanism according to an embodiment of the present invention.

Fig. 3A is a view showing the lens driving mechanism in Fig. 2 combined with a transparent plate and a circuit board.

Fig. 3B is a cross-sectional view taken along line B-B of Fig. 3A.

Fig. 4A is a perspective view showing the outer frame in Fig. 3A.

Fig. 4B is a plan view showing the outer frame in Fig. 4A.

Fig. 5A is a perspective view showing the outer frame of Fig. 4A assembled with the lens carrier and the first magnetic element.

Fig. 5B is a plan view showing the outer frame, the lens carrier and the first magnetic member in Fig. 5A.

Fig. 6 is a perspective view showing a lens driving mechanism according to another embodiment of the present invention.

Fig. 7 is a perspective view showing a lens driving mechanism according to another embodiment of the present invention.

The preferred embodiment of the invention is described in conjunction with the drawings.

The above and other technical contents, features and advantages of the present invention will be apparent from the following detailed description of the preferred embodiments. The directional terms mentioned in the following embodiments, such as up, down, left, right, front or back, etc., are only directions referring to the additional drawings. Therefore, the directional terminology used is for the purpose of illustration and not limitation.

Fig. 2 is an exploded view showing the lens driving mechanism 20 according to an embodiment of the present invention. As shown in the figure, the lens driving mechanism 20 of the present embodiment is mainly used to carry a lens unit (not shown), wherein a driving component composed of a magnetic component such as a magnet and a coil is disposed inside the lens driving mechanism 20 to Drive the lens unit along the lens unit The optical axis moves in the L direction, which in turn achieves the effect of autofocus.

Specifically, the lens driving mechanism 20 mainly includes an outer frame 21, a lens carrier 22, a base 23, an upper reed S1, a lower reed S2, at least one first magnetic element M, and at least a second magnetic The component C, wherein the outer frame 21 has a substantially quadrangular shape and has an opening 210. The four side faces 212 of the outer frame 21 extend from the edge of the top surface 211 toward the base 23, and the base 23 and the outer frame 21 are fixedly coupled with each other. The carrier 22 is movably disposed between the outer frame 21 and the base 23, wherein the lens carrier 22 has a through hole 220 for receiving and carrying the lens unit (not shown). It should be understood that external light can enter the lens driving mechanism 20 through the opening 210 of the outer frame 21, and sequentially pass through the lens unit in the center of the lens carrier 22 and the lower base 23, and finally project to an image sensing unit. (eg CCD) surface to obtain image data.

As can be seen from FIG. 2, the first magnetic element M is disposed on the inner side surface of the outer frame 21, and the second magnetic element C is disposed on the outer side surface of the lens carrier 22, and corresponds to the aforementioned first magnetic element M. In this embodiment, the first magnetic element M is, for example, a monopole or multi-pole magnet, and the second magnetic element C is, for example, a coil. When the lens unit is driven to move in the optical axis L direction, an appropriate current can be applied. To the second magnetic element C, so that the magnetic field generated by the second magnetic element C acts on the magnetic field of the first magnetic element M, so that the lens unit can be moved in the direction of the optical axis L through the magnetic force to achieve rapid focusing and Anti-shock and other purposes. It should be noted that the first magnetic element M may also be a coil, and the second magnetic element C may be a single pole or a multi-pole magnet, so that the effect of controlling the movement of the lens unit by magnetic force can also be achieved.

Please refer to FIG. 2, FIG. 3A and FIG. 3B together, wherein FIG. 3A shows a schematic diagram of the lens driving mechanism 20 in FIG. 2 combined with a transparent plate G and a circuit board P, and FIG. 3B shows the image along the third embodiment. A cross-sectional view of the BB line segment. As can be seen from Figure 3A, The assembled lens driving mechanism 20 can be combined with a plastic or glass transparent plate G, wherein the transparent plate G is attached to the flat top surface 211 above the outer frame 21, thereby protecting the lens unit inside the lens driving mechanism 20. And other parts, and also allow external light to enter the lens driving mechanism 20 through the transparent plate G, so as to facilitate conversion of the received light into an electronic signal through an image sensing unit (such as a CCD), wherein the lens driving mechanism 20 The circuit board P coupled thereto can be electrically connected to an external power source, or the electronic signal can be transmitted to the processor external to the lens driving mechanism 20 through the circuit board P for data calculation.

Referring to FIG. 2 and FIG. 3B together, it can be seen that the lens carrier 22 and the upper and lower reeds S1 and S2 are disposed in the accommodating space 201 formed by the outer frame 21 and the base 23, wherein The reed S1 connects the outer frame 21 and the lens carrier 22, and the lower reed S2 connects the base 23 and the lens carrier 22. In particular, since the outer frame 21 of the present embodiment contains a plastic material (for example, it can be entirely made of a plastic material, or a metal powder can be incorporated into the plastic material), injection molding or insert molding can be utilized (Insert) Molding or the like is formed in an integrally formed manner, wherein the protrusion 213 (FIG. 3B) is formed directly on the inner side surface of the outer frame 21 when the outer frame 21 is formed, and the position of the aforementioned protrusion 213 corresponds to the outer frame 21 The adjoining portion of the quadrangular top surface 211 and the side surface 212 can form a large-area and flat quadrilateral top surface 211 over the outer frame 21 to enhance the bonding area of the outer frame 21 and the transparent plate G and strengthen the bonding between the two. The fixing effect is achieved by forming the bumps 213 in the vicinity of the abutting portion of the top surface 211 of the outer frame 21 and the side surface 212, and the overall structural strength of the outer frame 21 can be greatly improved.

Alternatively, the outer frame 21 may be formed by doping metal particles into the plastic material, which not only increases the magnetic field strength inside the mechanism, but also compares with the conventional pure metal. Plate pressing In terms of formula, it can improve its structural strength. On the other hand, since the outer frame 21 has a plastic material and can be fabricated by integral molding, the wires can be fabricated by Molded Interconnect Device (MID) technology (for example, Laser Direct Structuring). , LDS)) is formed directly on the outer frame 21, and it is not necessary to additionally provide a circuit component (such as the circuit board P in FIG. 3A) to be connected to the external circuit, and the overall size of the lens driving mechanism 20 can be greatly reduced and reduced. manufacturing cost.

Next, please refer to the figures 2, 4A to 5B, wherein FIG. 4A shows a perspective view of the outer frame 21 in FIG. 3A, FIG. 4B shows a top view of the outer frame 21 in FIG. 4A, and FIG. 5A shows the fourth view. In the figure, the outer frame 21 is assembled with the lens carrier 22 and the first magnetic element M, and FIG. 5B is a plan view of the outer frame 21, the lens carrier 22 and the first magnetic element M in FIG. 5A. As shown in the second and fourth embodiments, the outer surface of the lens carrier 22 is formed with at least one protruding slider 221, and the inner surface of the outer frame 21 is formed with at least one limiting structure R1 corresponding to the slider. 221, each of the limiting structures R1 has two limiting portions R11 protruding from the inner side surface of the outer frame 21, and an elongated concave extending toward the L optical axis direction is formed between the two limiting portions R11. The groove R12, wherein the width of the groove R12 is slightly larger than the width of the slider 221 . In this embodiment, by accommodating the slider 221 in the limiting structure R1, the movement of the slider 221 in the horizontal direction can be restricted to avoid impacting other parts in the lens driving mechanism 20 during use. .

In addition, as can be seen from FIG. 2 and FIG. 4A to FIG. 5B, the inner side surface of the outer frame 21 is further formed with at least one protruding clamping portion R2, wherein the clamping portion R2 has a U-shaped structure, and the first portion The magnetic element M is housed in the groove R21 at the center of the nip portion R2, thereby preventing the first magnetic element M from being detached from the outer frame 21, and restricting the first magnetic element M to one of the inner surfaces of the outer frame 21 position. It should be understood that due to In the embodiment, the outer frame 21 is made of a plastic material and can be integrally formed. Therefore, the limiting structure R1 and the clamping portion R2 can be formed directly on the inner side surface of the outer frame 21 during the forming process without separately positioning. Components, which in turn can significantly reduce material and assembly costs.

Further, as can be clearly seen from FIG. 2 and FIG. 4A to FIG. 5B, the lens driving mechanism 20 of the present embodiment is substantially quadrangular and provided with two pairs of driving components (each driving component is respectively The first and second magnetic components M, C) are respectively disposed on opposite sides of the lens carrier 22 to drive the lens carrier 22 and the lens unit to move in the optical axis L direction, wherein the slider 221 and the limit The bit structure R1 is located on a side of the lens driving mechanism 20 that is different from the driving components (for example, the left and right sides of the lens carrier 22 in FIG. 5B).

Next, referring to Fig. 6, there is shown a perspective view of a lens driving mechanism 20 according to another embodiment of the present invention. As shown in the figure, the outer frame 21 of the lens driving mechanism 20 of the present embodiment has a hollow and quadrangular body 21' and a metal plate 24, wherein the body 21' contains a plastic material, and the metal plate 24 can be embedded and formed (Insert Molding) is integrally formed on one side of the body 21'.

Referring again to Fig. 7, there is shown a perspective view of a lens driving mechanism 20 according to another embodiment of the present invention. As shown in the figure, the embodiment differs from the embodiment of FIG. 6 in that a plurality of elongated holes 240 are formed on the metal plate 24 and correspond to one side of the metal plate 24 on the body 21'. A plurality of protrusions are formed, wherein the protrusions are fitted into the holes 240.

According to the disclosure of the foregoing embodiments, the present invention further provides an electronic device, including the lens driving mechanism 20 disclosed in any of the foregoing embodiments, wherein the lens driving mechanism 20 is substantially polygonal, and the lens driving mechanism 20 and at least one A wireless communication component, such as an antenna or a wireless communication chip, is disposed within the housing of the electronic device. It should be particularly noted that the foregoing driving component is adjacent to a first side of the lens driving mechanism 20 (for example, an upper side or a lower side of the lens carrier 22 in FIG. 5B), and the wireless communication component is adjacent to one of the lens driving mechanisms 20 Two sides (for example, located on the left or right side of the outer frame 21 in Fig. 5B).

In summary, the present invention provides a lens driving mechanism and an electronic device having the lens driving mechanism, wherein the outer frame of the lens driving mechanism is made of a plastic material, so that it can be integrally formed, thereby greatly reducing the lens driving. The overall size of the organization and can effectively reduce manufacturing costs. In addition, even if a communication component (such as an antenna or a wireless communication chip) located inside the electronic device is located close to the lens driving mechanism, the lens driving mechanism with a plastic material can reduce the influence on the communication component, so that the electronic device can be miniaturized. Ensure the performance of the communication components.

Although the present invention has been disclosed in its preferred embodiments, it is not intended to limit the present invention, and it is possible to make some modifications and refinements without departing from the spirit and scope of the present invention. The scope of the invention is defined by the scope of the appended claims.

20‧‧‧Lens drive mechanism

21‧‧‧Front frame

210‧‧‧Opening

211‧‧‧ top surface

212‧‧‧ side

22‧‧‧Lens carrier

220‧‧‧Perforation

221‧‧‧ Slider

23‧‧‧Base

M‧‧‧First magnetic component

C‧‧‧Second magnetic component

L‧‧‧ optical axis

S1‧‧‧Upper Reed

S2‧‧‧Reed

Claims (16)

A lens driving mechanism for driving a lens unit to move along an optical axis, comprising: an outer frame containing a plastic material and having an opening; a base contacting the outer frame and fixing each other, wherein the outer frame is Forming a receiving space between the bases; a lens carrier is movably disposed in the receiving space for carrying the lens unit, wherein an external light enters the receiving space through the opening of the outer frame to reach the lens And a driving component disposed in the receiving space, connecting the lens carrier and the outer frame to drive the lens unit to move along the optical axis. The lens driving mechanism of claim 1, wherein the outer frame further has a protrusion, a top surface and a side surface extending from an edge of the top surface toward the base, the protrusion protruding from the base One of the inner side surfaces of the outer frame corresponds to the abutment of the top surface and the side surface to enhance the structural strength of the outer frame. The lens driving mechanism of claim 2, wherein the top surface is quadrangular. The lens driving mechanism of claim 1, wherein the outer frame further comprises a metal material. The lens driving mechanism of claim 1, wherein the lens driving mechanism further comprises a wire formed directly on the outer frame by Molded Interconnect Device (MID) technology. The lens driving mechanism of claim 1, wherein the driving group The device includes a first magnetic component and a second magnetic component, wherein the first and second magnetic components are respectively disposed on the outer frame and the lens carrier, and the lens carrier is configured by the first and second magnetic The magnetic force generated between the elements moves relative to the outer frame and the base. The lens driving mechanism of claim 6, wherein the outer frame further has a clamping portion protruding from an inner side surface of the outer frame and restricting one of the first magnetic members on the inner side surface position. The lens driving mechanism of claim 7, wherein the clamping portion has a U-shaped structure, and the first magnetic component is received in the U-shaped structure. The lens driving mechanism of claim 6, wherein the first magnetic component is a magnet, and the second magnetic component is a coil to which an electric current can be applied. The lens driving mechanism of claim 9, wherein the first magnetic element comprises a multi-pole magnet. The lens driving mechanism of claim 1, wherein the lens carrier has a protruding slider, and the outer frame further has a limiting structure, wherein the sliding block is received in the limiting structure. To limit the movement of the slider. The lens driving mechanism of claim 11, wherein the limiting structure has two limiting portions protruding from an inner side surface of the outer frame, wherein the limiting portions form a light toward the light a groove extending in the axial direction, and the width of the groove is greater than the width of the slider. The lens driving mechanism of claim 11, wherein the lens driving mechanism is substantially polygonal and further comprises two driving components, and the driving The components are respectively disposed on opposite sides of the lens driving mechanism to drive the lens unit to move along the optical axis direction, wherein the slider and the limiting structure are located on a side of the lens driving mechanism different from the driving components. The lens driving mechanism of claim 1, wherein the outer frame is substantially quadrangular and further has a body comprising a plastic material and a metal plate, wherein the opening is formed on the body, and the metal plate is disposed On one side of the body. The lens driving mechanism of claim 14, wherein the metal plate is formed with a plurality of holes, and the body is formed with a plurality of protrusions, wherein the protrusions are fitted into the holes. An electronic device, comprising: a lens driving mechanism according to claim 1, a housing, and a wireless communication component, wherein the lens driving mechanism is substantially polygonal, and the lens driving mechanism and the wireless communication component are both disposed on In the housing, wherein the driving component is adjacent to a first side of the lens driving mechanism, the wireless communication component is adjacent to a second side of the lens driving mechanism, and the second side is different from the first side.