CN109254473B

CN109254473B - Optical system

Info

Publication number: CN109254473B
Application number: CN201810606424.0A
Authority: CN
Inventors: 吴富源; 高国峻; 宋欣忠
Original assignee: TDK Taiwan Corp
Current assignee: TDK Taiwan Corp
Priority date: 2017-07-13
Filing date: 2018-06-13
Publication date: 2021-08-31
Anticipated expiration: 2038-06-13
Also published as: TWI768061B; CN109254380B; CN208297804U; TW201908846A; CN109254380A; CN109254473A

Abstract

The present disclosure provides an optical system including a fixed portion, a movable portion, a driving assembly and a plurality of sliding elements. The fixing portion includes a base. The movable part comprises an optical element bearing part and a driving frame unit. The optical element carrier is configured to carry an optical element, and the driving frame unit is connected to the optical element carrier. The driving assembly comprises at least one first magnetic element and at least one second magnetic element. The second magnetic element corresponds to the first magnetic element and is used for driving the driving frame unit to drive the optical element bearing piece to move relative to the base. The sliding elements are fixedly arranged on one of the fixed part and the movable part so that the movable part can slide relative to the fixed part.

Description

Optical system

Technical Field

The present disclosure relates to optical systems, and particularly to an optical system with an optical anti-shake function.

Background

With the development of technology, many electronic devices (such as tablet computers or smart phones) have a function of taking pictures or recording videos. Through an optical system (e.g., a camera module) disposed on the electronic device, a user can operate the electronic device to obtain various photos, so that the electronic device having the camera module is gradually popular with the public.

Generally, an Image pickup module has functions of Auto Focusing (Auto Focusing) and Optical Image Stabilization (Optical Image Stabilization). The camera module may include an optical element carrier, a plurality of elastic elements, and a base, and the optical element carrier moves relative to the base through the elastic elements, for example, moves along an XY plane. When the camera module is shaken, the driving component in the camera module can drive the optical element bearing piece to move in the opposite direction so as to achieve the purpose of preventing hand vibration. However, when the thickness of the camera module needs to be reduced for miniaturization, the elastic member is easily damaged because of its too short length.

Therefore, how to design a camera module that can reduce the height of the camera module and achieve the function of optical anti-shake is the subject worth to be discussed and solved at present.

Disclosure of Invention

The present invention provides an optical system to solve the above problems.

The embodiment of the invention discloses an optical system, which comprises a fixed part, a movable part, a driving assembly and a plurality of sliding elements. The fixing portion includes a base. The movable part comprises an optical element bearing part and a driving frame unit. The optical element carrier is configured to carry an optical element, and the driving frame unit is connected to the optical element carrier. The driving assembly comprises at least one first magnetic element and at least one second magnetic element. The second magnetic element corresponds to the first magnetic element and is used for driving the driving frame unit to drive the optical element bearing piece to move relative to the base. The sliding elements are fixedly arranged on one of the fixed part and the movable part so that the movable part can slide relative to the fixed part.

According to some embodiments of the present invention, the optical system further includes a circuit unit disposed on the fixing portion, wherein at least two of the sliding elements contact the circuit unit. According to some embodiments of the present invention, the driving assembly further includes a driving coil disposed on the optical element carrier, and the driving coil is electrically connected to the circuit unit through the sliding elements. According to some embodiments of the present invention, the movable portion further includes an elastic element connecting the optical element carrier and the driving frame unit, wherein the sliding element includes a protrusion disposed on the elastic element.

According to some embodiments of the present invention, the circuit unit includes a plurality of electrical contacts corresponding to the sliding elements, and the electrical contacts define a plane perpendicular to an optical axis of the optical element. According to some embodiments of the present invention, each of the electrical contact points has a size larger than a sliding range of the corresponding sliding element.

According to some embodiments of the present invention, the fixing portion includes a housing, and the driving frame unit includes an outer moving frame moving in a first direction with respect to the housing. According to some embodiments of the present invention, the driving frame unit further includes an inner moving frame moving along a second direction relative to the outer moving frame, wherein the first direction is different from the second direction. According to some embodiments of the present invention, the sliding elements are respectively disposed on a first side of the outer moving frame and a second side of the inner moving frame, and the first side and the second side are not parallel.

According to some embodiments of the present invention, the movable portion, the sliding elements and the base are arranged in sequence along an optical axis direction of the optical element.

According to some embodiments of the present invention, the driving assembly includes a plurality of first magnetic elements disposed on the driving frame unit, and two adjacent first magnetic elements have different sizes. According to some embodiments of the present invention, the heights of two adjacent first magnetic elements along an optical axis of the optical element carrier are not equal.

According to some embodiments of the present invention, the fixing portion further includes a magnetic conductive element, and the first magnetic element is disposed on the driving frame unit and generates a magnetic attraction force with the magnetic conductive element.

The present disclosure provides an optical system having an optical element carrier, a driving frame unit, a driving assembly and a base. The driving assembly can generate an electromagnetic driving force to drive the driving frame unit to drive the optical element bearing piece to move relative to the base. In some embodiments, the driving frame unit may include an outer moving frame and an inner moving frame, the inner moving frame may drive the optical element carrier to move along a second direction relative to the outer moving frame, and the outer moving frame may drive the inner moving frame and the optical element carrier to move along a first direction.

Based on the structural design of the embodiment of the invention, a plurality of elastic elements for connecting the connecting reeds and the fixing parts can be omitted, and the problem that the elastic elements are easy to damage due to too short length can be avoided. Therefore, the optical system of the embodiment of the invention not only can reduce the manufacturing cost, but also can reduce the size of the optical system so as to achieve the aim of miniaturization.

Additional features and advantages of the invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by practice of the disclosed principles. The features and advantages of the invention may be realized and obtained by means of the instruments and combinations particularly pointed out in the appended claims. These and other features of the present invention will become more fully apparent from the following description and appended claims, or may be learned by the practice of the invention as set forth hereinafter.

Drawings

The present disclosure will become more fully understood from the detailed description given herein below and the accompanying drawings. It is emphasized that, in accordance with the standard practice in the industry, various features are not drawn to scale and are used for illustrative purposes only. In fact, the dimensions of the various features may be arbitrarily expanded or reduced for clarity of presentation.

FIG. 1 is a schematic perspective view of an optical system according to an embodiment of the present invention

FIG. 2 is an exploded view of the optical system of the embodiment of FIG. 1 according to the present invention

Fig. 3 shows a cross-sectional view taken along line a-a' in fig. 1.

Fig. 4A and 4B are schematic diagrams illustrating the driving frame unit driving the optical element carrier to move along the Y-axis direction according to the embodiment of the invention.

Fig. 5A and 5B are schematic diagrams illustrating the driving frame unit driving the optical element carrier to move along the X-axis direction according to the embodiment of the invention.

Fig. 6 shows a cross-sectional view of the optical system along the line B-B' in fig. 1.

FIG. 7 is a partial structural diagram of a lower spring and a flat coil according to an embodiment of the invention.

Fig. 8 is an exploded view of an optical system according to another embodiment of the present invention.

Description of reference numerals:

100. 100A optical system

102 outer casing

1021 shell opening

1023 the space

103 outer moving frame

1031 side opening

103I inclined plane stop structure

103S first side

104 inner side moving frame

1041 groove

1043 central opening

104A frame

104I inclined plane

104S second side

106 upper reed

108 optical element carrier

1081 through hole

110 lower reed

1101 groove

112 base

1121 base opening hole

114 circuit board

115 flat coil

1151 electric contact point

115L second magnetic element

117 magnetic conductive element

150 sliding element

160 sliding element

170 sliding element

A1 first direction

A2 second direction

DCL drive coil

Height H1

Height H2

MEG11 first magnetic element

MEG12 first magnetic element

MEG13 magnetic element

O optical axis

Detailed Description

In order to make the objects, features and advantages of the present disclosure more comprehensible, embodiments accompanied with figures are described in detail below. The configurations of the elements in the embodiments are for illustration purposes and are not intended to limit the disclosure. And the reference numerals in the embodiments are partially repeated to simplify the description, and do not intend to relate different embodiments. Directional terms as referred to in the following examples, for example: up, down, left, right, front or rear, etc., are simply directions with reference to the drawings. Accordingly, the directional terminology used is intended to be in the nature of words of description rather than of limitation.

In addition, relative terms, such as "lower" or "bottom" and "upper" or "top," may be used in the embodiments to describe one element's relative relationship to another element as illustrated. It will be understood that if the device shown in the drawings is turned over with its top and bottom reversed, elements described as being on the "lower" side will be turned over to elements on the "higher" side.

As used herein, the terms "about" and "approximately" generally mean within 20%, preferably within 10%, and preferably within 5% of a given value or range. The quantities given herein are approximate quantities, meaning that the meanings of "about" and "approximately" are implied unless otherwise indicated.

Referring to fig. 1 to 3, fig. 1 is a schematic perspective view of an optical system 100 according to an embodiment of the invention, fig. 2 is an exploded view of the optical system 100 according to the embodiment of fig. 1, and fig. 3 shows a cross-sectional view taken along line a-a' in fig. 1. The optical system 100 may be a camera system having an optical driving component for carrying an optical element (not shown), and the optical system 100 may be installed in various electronic devices or portable electronic devices (such as a smart phone or a tablet computer) for a user to perform an image capturing function. In this embodiment, the optical driving component may be a Voice Coil Motor (VCM) with an Auto Focus (AF) function, but is not limited thereto. In some embodiments, the Optical driving components of the Optical system 100 may also have Auto Focusing (AF) and Optical Image Stabilization (OIS) functions.

With continued reference to fig. 2, fig. 2 shows an exploded view of the optical system 100 according to an embodiment of the present invention. The optical system 100 includes a housing 102, a driving frame unit (an outer moving frame 103 and an inner moving frame 104), an upper spring 106, an optical element carrier 108, two first magnetic elements MEG11, two first magnetic elements MEG12, a driving coil DCL, a lower spring 110, a base 112, a circuit unit (including a circuit board 114 and a flat coil 115), and a magnetic conductive element 117. The base 112 can be fixedly connected to the housing 102 to define a fixing portion, and the connecting manner can be riveting, clamping, or welding, but is not limited thereto, as long as the base 112 can be fixedly connected to the housing 102. In addition, the fixing portion may include other elements in other embodiments, such as the magnetic permeability element 117. Furthermore, the optical element carrier 108, the outer moving frame 103 and the inner moving frame 104 may be defined as a moving portion that moves relative to the fixed portion. In addition, the movable part may include the upper spring 106 or the lower spring 110.

The housing 102 has a hollow structure, and a housing opening 1021 is formed thereon, a base opening 1121 is formed on the base 112, a center of the housing opening 1021 corresponds to an optical axis O of an optical element (not shown) carried by the optical element carrier 108, and the base opening 1121 corresponds to an image sensing element (not shown) disposed below the base 112. The housing 102 may have a receiving space 1023 for receiving the outer moving frame 103, the inner moving frame 104, the upper spring 106, the optical element carrier 108, the first magnetic elements MEG11 and MEG12, the driving coil DCL, and the lower spring 110. In addition, the housing 102 can also accommodate the circuit board 114, the flat coil 115, the magnetic conductive element 117, and the base 112.

As shown in fig. 2, the outer moving frame 103 has two side openings 1031, and the inner moving frame 104 may have a plurality of recesses 1041 and a central opening 1043. In this embodiment, the inner moving frame 104 is accommodated in the outer moving frame 103, and the inner moving frame 104 may have four grooves 1041 for accommodating the first magnetic elements MEG11 and the first magnetic elements MEG12, but the number of the grooves 1041 and the first magnetic elements is not limited to this embodiment. In this embodiment, the first magnetic element may have a long bar shape, but is not limited thereto, and may have a different shape in other embodiments.

Furthermore, as shown in fig. 2, the optical element carrier 108 has a hollow ring structure and a through hole 1081, wherein a corresponding locking thread structure (not shown) is disposed between the through hole 1081 and the optical element, so that the optical element is locked in the through hole 1081. In this embodiment, the driving coil DCL is disposed around the optical element carrier 108. The optical element carrier 108 and the optical elements are disposed in the central opening 1043 and can move relative to the inner moving frame 104. More specifically, as shown in fig. 3, the optical element carrier 108 can be suspended in the central opening 1043 by connecting the upper spring 106 and the lower spring 110 to the inner moving frame 104.

When the driving coil DCL is powered on, the first magnetic element MEG11 and the first magnetic element MEG12 generate an electromagnetic driving force (electromagnetic force) with the driving coil DCL, thereby driving the optical element carrier 108 to move along the optical axis O direction (Z-axis direction) relative to the inner moving frame 104 and the base 112 for Auto Focusing (Auto Focusing). In some embodiments, the first magnetic element MEG11 and the first magnetic element MEG12 may include at least one multi-pole magnet (multipole magnet) for inducing the corresponding driving coil DCL and driving the optical element carrier 108 to move along the optical axis O for focusing.

It should be appreciated that the upper spring plate 106 and the lower spring plate 110 can be elastic elements. In this embodiment, the upper spring plate 106 can be integrally formed, and the lower spring plate 110 can be four separate spring plates, but is not limited thereto. It should be noted that, as shown in fig. 2 and 3, the inner portion of the upper spring 106 and the inner portion of the lower spring 110 are fixedly connected to the optical element carrier 108, and the outer portion of the upper spring 106 and the outer portion of the lower spring 110 are fixedly connected to the inner moving frame 104. Therefore, the optical element carrier 108 can be suspended in the central opening 1043 by the upper spring 106 and the lower spring 110.

Furthermore, the optical system 100 may include a plurality of sliding elements disposed on one of the movable portion and the fixed portion. For example, as shown in FIGS. 2 and 3, the outer portion of the lower spring plate 110 is provided with four sliding elements 150. In this embodiment, the sliding element 150 is a protrusion. As shown in FIG. 3, the sliding member 150 can have a semi-spherical structure, and the sliding member 150 is integrally formed with the lower spring plate 110, but is not limited to this embodiment. In addition, the flat coil 115 in the circuit unit may have a plurality of corresponding electrical contacts 1151 corresponding to the sliding elements 150. The electrical contacts 1151 may define a plane perpendicular to the optical axis O. In this embodiment, the flat coil 115 has four electrical contact points 1151, and the four sliding elements 150 of the lower spring 110 respectively abut against the four electrical contact points 1151, so that the lower spring 110 is electrically connected to the flat coil 115.

Furthermore, in this embodiment, the driving coil DCL can be electrically connected to the lower spring 110, so that the driving coil DCL can be electrically connected to the flat coil 115 through the sliding element 150 on the lower spring 110. It should be noted that, since the driving coil DCL has a positive terminal and a negative terminal, at least two sliding elements 150 are required to contact two electrical contact points 1151 on the planar coil 115, so that the driving coil DCL can operate normally when electrically connected to the circuit unit.

In this embodiment, the circuit board 114 may be a Flexible Printed Circuit (FPC), and the flat coil 115 is disposed on the circuit board 114 and electrically connected to the circuit board 114. In this embodiment, the flat coil 115 has four second magnetic elements 115L (coils) therein, corresponding to the first magnetic element MEG11 and the first magnetic element MEG12, and the second magnetic element 115L, the first magnetic element MEG11 and the first magnetic element MEG12 can be defined as a driving assembly. In this embodiment, the second magnetic element 115L is electrically connected to the circuit board 114 (for example, the flat coil 115 is provided with an electrical contact point directly contacting a circuit on the circuit board 114), and when the second magnetic element 115L in the flat coil 115 is energized, an electromagnetic driving force is induced by the first magnetic element MEG11 and the first magnetic element MEG12, so that the driving frame unit (the outer moving frame 103 and the inner moving frame 104) drives the optical element carrier 108 to move along the XY plane relative to the fixing portion (for example, the flat coil 115, the circuit board 114 and the base 112). Therefore, if the Optical system 100 is shaken, the Optical element carrier 108 can be driven by the electromagnetic driving force to move on the X-Y plane to compensate the movement of the Optical system 100 when the Optical system 100 is shaken, thereby achieving the purpose of Optical anti-shake (Optical Image Stabilization).

Furthermore, as shown in fig. 2 and fig. 3, the magnetic conductive element 117 may be a plate disposed on the base 112, and the circuit board 114 is disposed on the magnetic conductive element 117. In this embodiment, as shown in fig. 3, the first magnetic element MEG12 (fig. 3 only shows the first magnetic element MEG12) of the first magnetic element MEG11 disposed on the inner moving frame 104 generates a magnetic attraction force with the magnetic conductive element 117, and the magnetic attraction force can attract the inner moving frame 104, so that the inner moving frame 104 is more stably abutted on the planar coil 115 through the sliding element 150. That is, the sliding element 150 is not easily separated from the flat coil 115.

In addition, as can be seen from fig. 3, the movable portion (including the outer moving frame 103, the inner moving frame 104 and the optical element carrier 108), the sliding element 150, the flat coil 115, the circuit board 114 and the base 112 are arranged in sequence along the direction of the optical axis O, that is, along the direction of the Z-axis.

In other embodiments of the present disclosure, the flat coil 115, the circuit board 114, the magnetic conductive element 117 and the base 112 can be integrated into an integral base. For example, the base body may be made of a metal material, an insulating layer may be formed on the base body, and a plurality of electronic circuits may be further formed on the insulating layer, and the electronic circuits may include the second magnetic element 115L and the circuit board 114. Based on the structure design, the height of the optical system along the Z-axis direction can be further reduced, so that the aim of miniaturization is fulfilled.

Referring to fig. 2, fig. 4A and fig. 4B are schematic diagrams illustrating that the driving frame unit drives the optical element carrier 108 to move along the Y-axis direction according to an embodiment of the invention. As shown in fig. 2 and 4A, the optical system 100 may further include a plurality of sliding elements 160 disposed on two first sides 103S of the outer moving frame 103, and the outer moving frame 103 may contact an inner wall surface of the housing 102 along the X-axis direction through the plurality of sliding elements 160, that is, the outer moving frame 103 may not move along the X-axis direction relative to the housing 102. Furthermore, the optical system 100 may further include a plurality of sliding elements 170 disposed on the two second sides 104S of the inner moving frame 104, and the inner moving frame 104 abuts against the inner wall surface of the outer moving frame 103 along the Y-axis direction through the sliding elements 170, that is, the inner moving frame 104 cannot move along the Y-axis direction relative to the outer moving frame 103. In this embodiment, the first side 103S is not parallel to the second side 104S. Specifically, the first side 103S is substantially perpendicular to the second side 104S.

When the two first magnetic elements MEG12 and the corresponding second magnetic elements 115L generate the electromagnetic driving force, the electromagnetic driving force drives the outer moving frame 103 to move along a first direction a1 (Y-axis direction) relative to the housing 102, and thus the outer moving frame 103 also drives the inner moving frame 104 and the optical element carrier 108 to move along the first direction a1 (Y-axis direction). For example, the electromagnetic driving force may drive the outer moving frame 103, the inner moving frame 104, and the optical element carrier 108 to move from the position of fig. 4A to the position of fig. 4B.

Referring to fig. 2, fig. 5A and fig. 5B are schematic diagrams illustrating that the driving frame unit drives the optical element carrier 108 to move along the X-axis direction according to an embodiment of the invention. Similarly, when the two first magnetic elements MEG11 and the corresponding second magnetic element 115L generate the electromagnetic driving force, the electromagnetic driving force drives the inner moving frame 104 to move along a second direction a2 (X-axis direction) relative to the outer moving frame 103, so that the inner moving frame 104 also drives the optical element carrier 108 to move along the second direction a2 (X-axis direction). For example, the electromagnetic driving force may drive the inner moving frame 104 and the optical element carrier 108 to move from the position of fig. 5A (uppermost position) to the position of fig. 5B (lowermost position). In this embodiment, the first direction a1 is different from the second direction a 2. Specifically, the first direction a1 is substantially perpendicular to the second direction a2, the second direction a2 is substantially perpendicular to the optical axis O, and the first direction a1 and the second direction a2 intersect the optical axis O.

It is noted that, in this embodiment, the sliding

elements

160 and 170 may have a hemispherical structure, but are not limited to this embodiment. The sliding member 160 is fixedly provided to the outer moving frame 103, and the sliding member 170 is fixedly provided to the inner moving frame 104. For example, the sliding element 160 may be integrally formed with the outer moving frame 103, and the sliding element 170 may be integrally formed with the inner moving frame 104. That is, the sliding element 160 does not roll with respect to the housing 102 or the outer moving frame 103, and the sliding element 170 does not roll with respect to the inner moving frame 104 or the outer moving frame 103. In some embodiments, the sliding element 160 and the sliding element 170 may be made of metal, the inner side of the housing 102 contacting the sliding element 160 may be made of metal, and the inner side of the outer moving frame 103 contacting the sliding element 170 may be made of metal. Due to the design, particles generated by friction can be reduced, and the particles are prevented from influencing the imaging result of the optical system 100.

When the sliding

elements

160 and 170 are made of metal, one or more circuits may be formed on the inner surface of the housing 102 by molding an interconnection Device (MID), so that the circuit board 114 may be electrically connected to the driving coil DCL through the circuits, the sliding elements 160, the outer moving frame 103, the sliding elements 170, the inner moving frame 104, and the upper spring 106. Based on such a design, the height of the optical system 100 along the Z-axis direction can be further reduced to achieve miniaturization.

In other embodiments, the movement of the outer moving frame 103 and the inner moving frame 104 can be realized by other methods. For example, but not limited to, a track or a ball may be disposed between the housing 102 and the outer moving frame 103 or between the outer moving frame 103 and the inner moving frame 104. So long as the driving frame unit can be moved along the XY plane, is within the scope of the present disclosure.

Referring to fig. 6, fig. 6 is a cross-sectional view of the optical system 100 taken along line B-B' of fig. 1. For the sake of clarity, optical system 100 in FIG. 6 only represents some of the elements. As shown in fig. 6, the first side 103S of the outer moving frame 103 has a slope stop 103I thereon, and the inner moving frame 104 has a slope 104I corresponding to the slope stop 103I. When the inner moving frame 104 is driven by the electromagnetic driving force to move to the rightmost position or the leftmost position along the X-axis direction, the inclined stop structure 103I abuts against the inclined surface 104I to limit a limit position (e.g., a right limit position and a left limit position in fig. 6) of the inner moving frame 104 in the X-axis direction.

In addition, in this embodiment, the first magnetic element MEG11 is not equal to the adjacent first magnetic element MEG12 in size. For example, as shown in fig. 6, the first magnetic element MEG11 has a height H1 along the optical axis O direction, the first magnetic element MEG12 has a height H2 along the optical axis O direction, and the height H2 is greater than the height H1. Based on the above-described structural design, not only the width of the optical system 100 along the X-axis direction can be reduced, but also the inner moving frame 104 can have a large moving range along the X-axis.

Furthermore, in this embodiment, the area of the magnetic conductive element 117 on the XY plane is larger than the moving range of the inner moving frame 104 along the X-axis direction or the Y-axis direction. That is, when viewed along the optical axis O direction, the moving range of the first magnetic element MEG11 and the first magnetic element MEG12 does not exceed the magnetic permeability element 117, so that the stability of the driving frame unit during moving can be ensured. In addition, in other embodiments, the driving coils DCL may also be disposed on two opposite sides of the optical element carrier 108 (instead of surrounding the optical element carrier 108), facing the two first magnetic elements MEG 12. Based on such a structural design, the problem of magnetic interference inside the optical system 100 can be improved.

Referring to fig. 7, fig. 7 is a partial structural schematic view of the lower spring plate 110 and the flat coil 115 according to an embodiment of the invention. As shown in fig. 7, the sliding element 150 is disposed on the lower spring plate 110 and abuts against the electrical contact 1151 on the flat coil 115. It should be noted that, since the inner moving frame 104 (fig. 6) and the lower spring 110 are driven by the electromagnetic driving force to move along the X-axis direction or the Y-axis direction, the sliding element 150 also moves along the X-axis direction or the Y-axis direction along with the lower spring 110. In this embodiment, the size of electrical contact 1151 is designed to be larger than the sliding range of sliding element 150, so as to avoid that sliding element 150 cannot be continuously electrically connected to electrical contact 1151.

In addition, as shown in FIG. 7, the lower spring plate 110 can be formed with a groove 1101 on the opposite side of the sliding element 150. In this embodiment, glue can be disposed in the groove 1101 so that the lower spring plate 110 can be fixedly connected to the inner moving frame 104 of FIG. 3. In other embodiments, the inner moving frame 104 may also be formed with a protrusion, which is configured to engage with the groove 1101, so that the lower spring 110 can be fixedly connected to the inner moving frame 104 shown in fig. 3. Due to such a structural design, the accuracy of assembling the lower spring 110 and the inner moving frame 104 can be improved, and the overall structural strength can be improved.

Referring to fig. 8, fig. 8 is an exploded view of an optical system 100A according to another embodiment of the invention. The structural configuration of this embodiment is similar to that of the previous embodiment, and the difference between the two embodiments is that the frame driving unit of the optical system 100A only has a frame 104A, and does not have the outer moving frame 103 in the optical system 100. In this embodiment, the four slots 1041 of the frame 104A are configured to receive the four magnetic elements MEG13, and the magnetic elements MEG13 have the same size. The four magnetic elements MEG13 correspond to the second magnetic element 115L in the flat coil 115, and the magnetic element MEG13 and the second magnetic element 115L induce an electromagnetic driving force, thereby driving the frame 104A and the optical element carrier 108 to move relative to the fixed portion. The fixing portion may include a flat coil 115, a circuit board 114, a magnetic conductive element 117, and a base 112.

In addition, similar to the previous embodiment, a magnetic attraction force is generated between the magnetic conductive element 117 and the four magnetic elements MEG13, so that the movable portion (e.g. the frame 104A, the optical element carrier 108, and the lower spring 110) is stably disposed on the fixed portion. Since the outer moving frame 103 in fig. 2 is omitted in this embodiment, the size of the optical system 100A can be further reduced for miniaturization.

In summary, the present disclosure provides an optical system having an optical element carrier 108, a driving frame unit, a driving assembly and a base 112. The driving assembly can generate an electromagnetic driving force to drive the driving frame unit to drive the optical element carrier 108 to move 112 relative to the base. In some embodiments, the driving frame unit may include an outer moving frame 103 and an inner moving frame 104, the inner moving frame 104 may drive the optical element carrier 108 to move along a second direction relative to the outer moving frame 103, and the outer moving frame 103 may drive the inner moving frame 104 and the optical element carrier 108 to move along a first direction.

Based on the structural design of the embodiment of the present invention, a plurality of elastic elements for connecting the upper spring 106 and the fixing portion can be omitted, and the problem that the elastic elements are too short to be easily damaged can be avoided. Therefore, the optical system of the embodiment of the invention not only can reduce the manufacturing cost, but also can reduce the size of the optical system so as to achieve the aim of miniaturization.

Although the embodiments of the present disclosure and their advantages have been disclosed above, it should be understood that various changes, substitutions and alterations can be made herein by those skilled in the art without departing from the spirit and scope of the disclosure. Moreover, the scope of the present disclosure is not intended to be limited to the particular embodiments of the process, machine, manufacture, composition of matter, means, methods and steps described in the specification, but rather, the process, machine, manufacture, composition of matter, means, methods and steps, presently existing or later to be developed, that will be obvious to one having the benefit of the present disclosure, may be utilized in the practice of the present disclosure. Accordingly, the scope of the present disclosure includes the processes, machines, manufacture, compositions of matter, means, methods, and steps described above. In addition, each claim constitutes a separate embodiment, and the scope of protection of the present disclosure also includes combinations of the respective claims and embodiments.

Claims

1. An optical system, comprising:

a fixing part including a base;

a movable portion, comprising:

an optical element carrier configured to carry an optical element;

a driving frame unit connected to the optical element carrier;

a drive assembly, comprising:

at least one first magnetic element; and

at least one second magnetic element corresponding to the first magnetic element for driving the driving frame unit to drive the optical element bearing member to move relative to the base; and

a plurality of sliding elements which are fixedly arranged on one of the fixed part and the movable part so as to enable the movable part to slide relative to the fixed part; and

a circuit unit disposed on the fixing portion, wherein at least two of the sliding elements contact the circuit unit;

the driving assembly also comprises a driving coil which is arranged on the optical element bearing piece and is electrically connected with the circuit unit through the sliding elements;

the movable part also comprises an elastic element which is connected with the optical element bearing part and the driving frame unit, wherein the sliding element comprises a protruding part which is arranged on the elastic element.

2. The optical system of claim 1, wherein the circuit unit comprises a plurality of electrical contacts corresponding to the sliding elements, and the electrical contacts define a plane perpendicular to an optical axis of the optical element.

3. The optical system of claim 2, wherein each electrical contact has a size greater than a sliding range of the corresponding sliding element.

4. The optical system of claim 1, wherein the fixed portion comprises a housing and the drive frame unit comprises an outer moving frame moving in a first direction relative to the housing.

5. The optical system of claim 4, wherein the driving frame unit further comprises an inner moving frame moving along a second direction relative to the outer moving frame, wherein the first direction is different from the second direction.

6. The optical system of claim 5, wherein the sliding elements are respectively disposed on a first side of the outer moving frame and a second side of the inner moving frame, and the first side and the second side are not parallel.

7. The optical system of claim 1, wherein the movable portion, the sliding elements and the base are arranged in sequence along an optical axis of the optical element.

8. The optical system of claim 1, wherein the driving assembly comprises a plurality of first magnetic elements disposed on the driving frame unit, and two adjacent first magnetic elements have different sizes.

9. The optical system of claim 8, wherein the heights of two adjacent first magnetic elements along an optical axis of the optical element carrier are not equal.

10. The optical system of claim 1, wherein the fixing portion further comprises a magnetic conductive element, and the first magnetic element is disposed on the driving frame unit and generates a magnetic attraction force with the magnetic conductive element.