KR102334584B1 - Actuator for camera and camera module including it - Google Patents

Abstract

According to the present invention, a camera actuator comprises: a first reflectometer provided at a rear of a lens assembly and reflecting light passing through the lens assembly; a first carrier wherein the first reflectometer is mounted; a second reflectometer reflecting light incident from the first reflectometer to an image sensor direction; a second carrier wherein the second reflectometer is mounted; a housing accommodating the first and second carriers; and a driving unit moving the first and second carriers to be close or apart from each other.

Description

Actuator for camera and camera module including same

The present invention relates to an actuator for a camera and a camera module including the same, and more particularly, to an actuator that implements autofocus using the relative movement relationship of an optical system positioned between a lens and an image sensor.

As hardware technology for image processing develops and user needs for image shooting increase, autofocus (AF, Auto Focus) is applied to camera modules installed in mobile terminals such as mobile phones, smartphones, etc., as well as independent camera devices. Functions such as optical image stabilization (OIS) are being implemented.

The autofocus (autofocus control) function adjusts the focal length with the subject by linearly moving the carrier on which the lens is mounted in the direction of the optical axis to create a clear image on the image sensor (CMOS, CCD, etc.) provided at the rear end of the lens. means function.

In addition, the hand shake correction function refers to a function of improving image sharpness by adaptively moving a carrier on which the lens is mounted in a direction to compensate for the shake when the lens shakes due to hand shake.

One of the representative methods for implementing the autofocus or OIS function is to install a magnet (coil) on a moving body (carrier), install a coil (magnet) on a fixed body (housing, or other type of carrier, etc.), and then install the coil and magnet It is a method of moving a moving object in the direction of the optical axis or in a direction perpendicular to the optical axis by generating an electromagnetic force between them.

In recent mobile terminals, lenses with specifications such as being able to variably adjust the focal length or to shoot long-distance images are equipped in order to meet the higher user needs and to implement more diversified user convenience, etc. is becoming

Since such a lens has a structure in which a plurality of lenses or lens groups are arranged side by side, or a length of the lens itself based on the optical axis direction is long, a larger mounting space should be provided in the mobile terminal.

In addition, in the case of such a lens, a sufficient distance must be secured between the lens and the image sensor due to the unique optical characteristics of the lens itself, and further, the lens (carrier on which the lens is mounted) is moved linearly to realize autofocus, etc. It should also be designed to ensure an extended distance of linear movement.

Therefore, in the case of a device or actuator that drives such a lens, it is difficult to optimize for the essential characteristics related to the miniaturization or slimming of the device aimed at by the mobile terminal because it has a fairly long length characteristic, and the design environment of other devices, elements, and parts in the mobile terminal It can be said that there is a problem that it is quite restrictive.

Furthermore, in the case of a device or actuator driving such a lens, the moving distance of the lens itself becomes longer in order to implement the auto focus function (AF. can be said to lower

Korean Patent Publication No. 10-2090625 (2020.03.18)

The present invention has been devised to solve the above-mentioned problems in the background as described above, and the spatial utilization of the auto-focus control device or actuator can be more effectively implemented, and the time response in which the auto-focus function is implemented is more dramatic. It aims to provide an actuator that can be improved to

Other objects and advantages of the present invention can be understood from the following description, and will be more clearly understood by the embodiments of the present invention. In addition, the objects and advantages of the present invention can be realized by the configuration shown in the claims and the combination of the configuration.

The actuator for a camera according to an embodiment of the present invention for achieving the above object is provided at the rear of the lens assembly, the first reflector for reflecting the light passing through the lens assembly; a first carrier on which the first reflectometer is mounted; a second reflector for reflecting the light incident from the first reflector toward the image sensor; a second carrier on which the second reflectometer is mounted; a housing accommodating the first and second carriers; and a driving unit for moving the first and second carriers so that the first and second carriers approach or move away from each other.

Here, the driving unit of the present invention includes a first magnet provided on the first carrier; a second magnet provided on the second carrier; a first coil facing the first magnet; and a second coil facing the second magnet.

Preferably, the driving unit of the present invention reduces the length of a light path, which is an entire path of light flowing from the lens assembly to the image sensor through the first and second reflectors, so that the first and second reflectors are shortened. and moving the two carriers by the same distance in a direction adjacent to each other or moving the first and second carriers by the same distance in a direction away from each other to extend the length of the optical path.

In addition, it is preferable that the first and second reflectometers are configured such that the surface portions facing each other have an inclination of 45 degrees.

Furthermore, the present invention includes first and second guide rails having a shape extending in a direction perpendicular to an optical axis and provided in the housing; a first groove part rail facing the first guide rail and provided in the first carrier; a second groove part rail facing the second guide rail and provided in the second carrier; a first ball disposed between the first guide rail and the first groove part rail; and a second ball disposed between the second guide rail and the second groove part rail.

In addition, the first and second guide rails of the present invention may have a shape extending in an oblique direction with respect to the optical axis.

According to an embodiment, the present invention generates an attractive force to the first magnet and includes: a first yoke provided in the housing; and a second yoke that generates an attractive force to the second magnet and is provided in the housing.

Preferably, the housing of the present invention includes a first opening formed in a portion facing the lens assembly; and a second opening formed in a portion facing the image sensor. In this case, the first reflector reflects the light introduced through the first opening to the second reflector, and the second reflector It may be configured to reflect the light introduced from the first reflector to the image sensor through the second opening.

According to a preferred embodiment of the present invention, by using a reflectometer (optical system) provided between the lens and the image sensor to change the path of light, the overall structure and shape of the device can be realized in a more space-intensive form. Therefore, the overall space can be minimized, and of course, it can be further optimized for miniaturization of the mobile terminal.

In addition, according to another preferred embodiment of the present invention, each of the reflectors (optical systems) provided between the lens and the image sensor is moved, and the AF function can be implemented using the relative movement relationship in which these reflectors are close to or farther from each other. Therefore, it can be optimized for an optical environment in which the movement in the optical axis direction is relatively long.

Furthermore, in the case of the present invention, it is possible to implement an auto-focus control function that meets the lens specifications only with a shortened moving distance, and furthermore, it is possible to implement the auto-focus function in a shorter time, thereby further improving the time response characteristics. can

The following drawings attached to this specification illustrate preferred embodiments of the present invention, and serve to more effectively understand the technical spirit of the present invention together with the detailed description of the present invention to be described later, so the present invention is described in these drawings It should not be construed as being limited only to the matters.
1 is a view showing the overall configuration of an actuator for a camera and a camera module according to a preferred embodiment of the present invention;
2 is a view showing the configuration of an actuator for a camera according to a preferred embodiment of the present invention;
3 is a view for explaining an operating relationship in which a light-path is adjusted according to an embodiment of the present invention;
4 is a view for explaining first and second carriers and their related configurations according to a preferred embodiment of the present invention;
5 is a view showing a housing and its related configuration according to a preferred embodiment of the present invention;
6 is a view for explaining a process of implementing AF, etc. according to an embodiment of the present invention;
7 is a view for explaining a process of implementing AF, etc. according to another embodiment of the present invention.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. Prior to this, the terms or words used in the present specification and claims should not be construed as being limited to conventional or dictionary meanings, and the inventor should properly understand the concept of the term in order to best describe his invention. Based on the principle that it can be defined, it should be interpreted as meaning and concept consistent with the technical idea of the present invention.

Therefore, the configuration shown in the embodiments and drawings described in this specification is only the most preferred embodiment of the present invention and does not represent all of the technical idea of the present invention, so various equivalents that can be substituted for them at the time of the present application It should be understood that there may be water and variations.

1 and 2 are diagrams illustrating the overall configuration of an actuator for a camera (hereinafter referred to as an 'actuator') 100 and a camera module 1000 including the same according to an embodiment of the present invention, and FIG. 3 is It is a diagram for explaining the operating relationship in which a light-path is adjusted according to an embodiment of the present invention.

As shown in Figure 1, the actuator 100 according to the embodiment of the present invention is provided at the rear (based on the Z-axis) of the lens assembly 300, and the light passing through the lens assembly 300 is the image sensor 400 It includes a configuration for changing the path of light to flow into (see FIG. 3).

The actuator 100 according to the embodiment of the present invention may be implemented as a single device of an independent type, and may also be implemented as a camera module 1000 including a lens assembly 300 according to an embodiment. .

The camera module 1000 of the present invention is provided in the front (based on the Z-axis) of the lens assembly 300 according to the embodiment as shown in FIG. 1 to change the light of the subject in the lens assembly 300 direction. A module 200 may be further included.

The reflectometer module 200 includes an optical system 210 including a mirror or a prism therein, and the optical system 210 is configured when light from a subject or the like is introduced from the outside (Z1 path in FIG. 1 ). ) to change the incoming light in the lens assembly 300 direction (Z path in FIG. 1).

According to an embodiment, the reflectometer module 200 may further include driving means such as a coil (230, see FIG. 3) and a magnet (220, see FIG. 3) therein.

In this case, the optical system 210 is configured to be rotationally moved or moved based on one or more directions of the X-axis or the Y-axis through the driving of the driving means, and the rotational movement or movement of the optical system 210 is the X-axis or the Y-axis. By generating movement of light based on the direction, correction by hand-shake is realized.

As described above, when the camera module 1000 of the present invention includes the reflectometer module 200, the path of the light entering from the outside is changed (refracted) once through the reflectometer module 200, and the The path is changed again by the actuator 100 and is configured to flow into the image sensor 400 .

Hereinafter, in the description of the present invention, a direction axis corresponding to a path through which light enters the lens assembly 300, that is, a direction axis corresponding to the longitudinal direction of the lens assembly 300 is defined as an optical axis (Z axis), and this optical axis ( Z-axis) and two axes on a plane perpendicular to the X-axis and Y-axis are defined.

In addition, the lens assembly 300 of the present invention may be implemented in a form including one or two or more lenses, and if a plurality of lenses are included, additional optical means may be further included depending on the embodiment.

1 and the like, the actuator 100 of the present invention includes a first reflectometer 120, a first carrier 130 on which the first reflectometer 120 is mounted, a second reflectometer 140, and the The second carrier 150 on which the second reflectometer 140 is mounted, a driving unit for driving the linear movement of the first and second carriers 130 and 150, and the main housing 110-1 and the case 110-2 It may be configured to include a housing 110 that may be made of

The first reflectometer 120 of the present invention is provided at the rear of the lens assembly 300 (based on the optical path passing through the lens assembly), and transmits the light of the subject passing through the lens assembly 300 to the second reflector. (140) reflects (refracts), and the second reflector 140 of the present invention reflects (refracts) the light incident from the first reflector 120 toward the image sensor 400 .

The light that has passed through the lens assembly 300 through the combined structure of the first reflector 120 and the second reflector 140 is reflected (refraction) multiple times through its light path. ) is changed and introduced into the image sensor 400 .

As shown in FIG. 3 , when the reflectometers 120 and 140 change the optical path of the subject P, and finally change the path of the light in the optical axis direction again, as in the prior art, in the optical axis direction and It is possible to effectively overcome a shape or structure that extends excessively in a specific direction, such as, to further increase spatial utilization and efficiency of structural design.

The sum of the inclination (A°) of the first reflector 120 and the inclination (B°) of the second reflector 140 facing each other is 90 degrees so that the light introduced into the optical axis can flow out again precisely in the optical axis direction. Preferably, the inclination (A°) of the first reflector 120 and the inclination (B°) of the second reflector 140 are each 45 degrees in order to increase the precision of the physical and optical structure. do.

The first reflector 120 and the second reflector 140 are made of various materials that can change the path of light, such as a mirror or a prism, based on the physical or optical characteristics of the actuator 100. Of course, it is preferable to be implemented with a glass material in order to further improve optical properties such as preventing optical loss.

Through this configuration of the present invention, light passing through the lens assembly 300 in the optical axis direction can be accurately introduced into the image sensor 400 based on the optical axis direction again without tilt or shift.

The first carrier 130 of the present invention is a configuration that physically supports the first reflector 120, and as will be described later, with respect to the housing 110, one direction perpendicular to the optical axis (Z-axis direction) is the X-axis direction. It corresponds to a moving body that moves linearly. As such, when the first carrier 130 moves forward and backward linearly in the X-axis direction, the first reflectometer 120 mounted on the first carrier 130 also includes the first carrier ( 130) along with the linear movement in the X-axis direction.

The second carrier 150 on which the second reflectometer 140 is mounted also corresponds to a movable body that linearly moves in the X-axis direction, which is the same axial direction as the moving direction of the first carrier 130 with respect to the housing 110 . As such, when the second carrier 150 linearly moves forward and backward based on the X-axis direction, the second reflectometer 140 mounted on the second carrier 150 also moves along the X-axis with the second carrier 150 . move linearly in the direction

The first carrier 130 and the second carrier 150 are physically individualized, and are configured to be independently linearly moved through independent power application and control by the driving unit of the present invention.

As such, the driving unit of the present invention controls the linear movement of each of the first and second carriers 130 and 150, and controls the first and second carriers 130 and 150 to move in the X-axis direction. , in an embodiment for implementing OIS, the first carrier 130 and the second carrier 150 may be moved together in the same direction.

In addition, as will be described later, in order to implement a preferred embodiment of the present invention, the driving unit of the present invention controls the first and second carriers 130 and 150 to move in the X-axis direction, but in different directions, that is, the first and The second carriers 130 and 150 are controlled to move in a direction close to each other or move in a direction away from each other.

For example, the driving unit of the present invention moves the first carrier 130 in the positive X-axis direction and the second carrier 150 in the negative X-axis direction to move the first carrier 130 and the second carrier 150 in the negative X-axis direction. ) can be controlled to shorten the distance between them.

In addition, the first carrier 130 moves in the negative X-axis direction and the second carrier 150 moves in the positive X-axis direction so that the distance between the first carrier 130 and the second carrier 150 increases. can be controlled.

As such, the driving unit of the present invention is configured to drive and control the linear movement of the first and second carriers 130 and 150, and the first carrier 130 and the second carrier using an external control signal or a sensed signal system. Of course, if the carrier 150 can be moved, it can be implemented in various applications such as shape memory alloy (SMA), piezoelectric element, and micro electro mechanical system (MEMS).

However, in consideration of efficiency such as device miniaturization, power consumption, noise suppression, space utilization, linear movement characteristics, and precision control, it is preferable to implement the driving unit in a form in which electromagnetic force generated between the magnet and the coil is applied.

Specifically, according to a preferred embodiment of the present invention, the driving unit of the present invention is provided in the first magnet (M1) provided in the first carrier 130, the housing 110, the first magnet (M1) and The first coil C1 disposed in the facing direction, the second magnet M2 provided in the second carrier 150, and the housing 110 are provided in a direction facing the second magnet M2. A second coil C2 may be included.

Since the electromagnetic force between the magnet and the coil has a relative relationship, the arrangement of the coil on the moving body and the magnet on the fixed body also generates substantially the same effect. However, it may be preferable to provide a magnet on the side of the moving body and a coil on the side of the fixed body in order to more simply implement the electrical wiring relationship and the physical coupling structure.

The housing 110 of the present invention is a frame constituting the body of the actuator 100 according to the present invention, and accommodates the first carrier 130 and the second carrier 150, and the first carrier 130 and the second carrier which are movable bodies. It corresponds to a fixed body in terms of relative to the two carriers (150).

The circuit board 170 of the present invention may be implemented in the form of an FPCB or the like, and is provided on the housing 110 side corresponding to the fixed body. The circuit board 170 may be formed in a bent shape as shown in FIGS. 2 and 5 , and the circuit board 170 includes a first coil C1 , a second coil C2 , and a first position sensor. Components that require power application and control signal interfacing, such as (H1) and the second position sensor (H2), are mounted.

The first position sensor H1 is a sensor that detects the position of the first carrier 130 and outputs a signal corresponding to the sensed result. The magnetic field magnitude of the first magnet M1 and It may be implemented as a hall sensor that detects a change in direction and outputs an electrical signal corresponding thereto.

The first driving driver is a configuration that controls the magnitude and direction of the power applied to the first coil C1 by the signal of the first position sensor H1, and is integrated with the first position sensor H1 through the SOC, It may be implemented in the form of a single chip. Since the contents of the second position sensor H2 and the second driving driver also correspond to the contents of the first position sensor H1 and the like, the description thereof will be omitted.

4 is a view for explaining the first and second carriers 130 and 150 and related configurations according to a preferred embodiment of the present invention, and FIG. 5 is a housing 110 according to a preferred embodiment of the present invention and It is a diagram showing a configuration related to this.

Hereinafter, a detailed configuration of the present invention and a driving relationship in which the first and second carriers 130 and 150 of the present invention move with respect to the housing 110 will be described in detail with reference to FIGS. 4 and 5 .

As described above, the first magnet M1 installed in the first carrier 130 and the first coil C1 installed in the housing 110 are disposed to face each other, and the size and When the power in the direction is applied, a magnetic force of a corresponding magnitude and direction is generated between the first magnet M1 and the first coil C1, and the first carrier 130 provided with the first magnet M1 moves along the X axis. move backwards in the direction

As such, when the first carrier 130 linearly moves in the X-axis direction, the first reflector 120 mounted on the first carrier 130 also linearly moves in the X-axis direction.

4 and 5, the first carrier 130 includes a first groove part rail 131 having a shape extending in the X-axis direction, that is, in a direction perpendicular to the optical axis, and the first groove part A first guide rail 111 is formed on the side of the housing 110 facing the work 131 . In addition, the first ball B1 is disposed between the first groove part rail 131 and the second guide rail 112 .

Through this configuration, the first carrier 130 maintains an appropriate distance from the housing 110 by the first ball B1, and the first ball B1 performs point-contact and moving. , rolling (rolling), etc. can be more flexibly linear movement due to the minimized friction force, as well as noise reduction, it is possible to minimize the driving force for the linear movement of the first carrier (130).

As in the manner in which the first carrier 130 moves linearly, when power of an appropriate size and direction is applied to the second coil C2, an electromagnetic force is generated between the second coil C2 and the second magnet M2, and The second carrier 150 moves in the X-axis direction perpendicular to the optical axis by the generated electromagnetic force.

As such, when the second carrier 150 linearly moves in the X-axis direction, the first reflectometer 140 mounted on the second carrier 150 also linearly moves in the X-axis direction.

The second groove part rail 151 of the second carrier 150 of the present invention, the second guide rail 112 and the second ball B2 of the housing 110 are also related to the above-described first carrier 130 Since it corresponds to the description of the configuration, specific details will be omitted.

As shown in FIG. 5 , a first magnet M1 and a first yoke 180 - 1 generating an attractive force are provided on the rear surface (based on the Y-axis direction) of the housing 110 .

The first yoke 180-1 and the first magnet M1 for generating attractive force are provided in different physical objects, and furthermore, between them (the housing 110 and the first carrier 130), the first ball B1 ) is located.

Therefore, the first carrier 130 can continuously maintain the point contact with the first ball B1 by the attractive force between the first yoke 180-1 and the first magnet M1, so that the first carrier 130 is not separated to the outside and the first An accurate separation distance corresponding to the diameter of the ball may be maintained with the housing 130 .

The second yoke 180 - 2 provided in the housing 110 generates an attractive force with the second magnet M2 mounted on the second carrier 150 , and between the housing 110 and the second carrier 150 . Since the second ball (B2) is located, the second carrier 150 and the housing 110 are connected to the second ball B2 by the attractive force between the second magnet M2 and the second yoke 180-2. keep in contact.

As shown in FIG. 5 , the first yoke 180-1 and the second yoke 180-2 may be provided separately, but depending on the embodiment, the first magnet M1 and the second magnet M2 and Of course, it may be implemented in the form of one plate covering the entire facing area.

In addition, according to the embodiment, a first through hole 117-1 and a second through hole 117-2 may be formed in the housing 110, and the first coil C1 and the second coil C2 may be formed through these through holes. The first magnet M1 and the second magnet M2 may be configured to face each other. In this configuration, the coils C1 and C2 may be induced to face the magnets M1 and M2 at a closer distance without any other physical obstacle.

In the housing 110 of the present invention, as shown in FIG. 5 , a first opening 113 and a second opening 115 are formed on the surface facing the lens assembly 300 and the image sensor 400 . The first opening 113 is formed in a portion opposite to the lens assembly 300 to become a window through which the light passing through the lens assembly 300 flows into the first reflector 120 .

The second opening 115 is formed on the same surface as the first opening 113 , and is formed in a portion facing the image sensor 400 , and the light reflected by the second reflector 140 is reflected by the image sensor 400 . ) becomes a window pointing toward

That is, the first reflector 120 reflects the light introduced through the first opening 113 to the second reflector 140 , and the second reflector 140 enters from the first reflector 120 . The emitted light is reflected to the image sensor 400 through the second opening 115 .

The region of light entering the first reflector 120 and the region of light flowing out of the second reflector 140 through the first opening 113 and the second opening 115 can be precisely specified. Furthermore, it is possible to effectively block unnecessary light coming from the outside, etc., and also to implement a function as a kind of structure for enhancing the physical support of the first and second carriers 130 and 150 .

6 is a view for explaining a process of implementing AF, etc. according to an embodiment of the present invention. As described above and as shown in FIG. 6 , the first carrier 130 and the second carrier 150 are equipped with a first reflector 120 and a second reflector 140 for reflecting (refracting) light, respectively. It moves linearly in the X-axis direction, which is one direction perpendicular to the optical axis.

AF is a function that creates a clear image on the image sensor by adjusting the distance between the lens (lens assembly) and the image sensor. do.

Depending on the optical characteristics or physical specifications of the lens, it may not be a big problem if a sufficient distance between the lens and the image sensor does not need to be secured. Therefore, a sufficient distance or space must be secured between the lens and the image sensor, and further, the moving distance for AF must also be sufficiently secured.

The actuator 100 to the camera module 1000 including the actuator 100 according to the present invention does not move the lens or the image sensor, but reflects/refracts the light that has passed through the lens assembly 300 a plurality of times (twice). The first and second reflectors 120 and 140 are respectively moved.

In addition, each of the first and second reflectors 140 is configured to move in the X-axis direction perpendicular to the optical axis, not in the optical axis direction.

First, the configuration indicated by reference numerals 120 and 140 in FIG. 6 means the first reflectometer 120 and the second reflectometer 140 positioned at the reference position (default) P0, respectively, and reference numeral 120-1 and 140-1 represent the first reflector 120 and the second reflector 140 at positions P1 that are moved by D1, respectively, but moved in a direction adjacent to each other.

In addition, the configuration indicated by reference numerals 120-2 and 140-2 means the first reflectometer 120 and the second reflectometer 140 at positions P2 that are moved by D2, respectively, and moved away from each other. .

When the first reflectometer 120 and the second reflectometer 140 are positioned at the reference position (hereinafter referred to as 'event 0'), the first reflector 120 and the second reflector 120 pass through the lens assembly 300 The entire path (hereinafter, referred to as 'light path') of the light flowing into the image sensor 400 through the second reflector 140 becomes 'Path_0'.

In addition, when the first and second reflectors 120-1 and 140-1 move to be close to each other by D1 (hereinafter referred to as 'event 1'), the light path becomes Path_1 and , when the first and second reflectors 120-2 and 140-2 move apart from each other by D2 (hereinafter referred to as 'event 2'), the light path becomes Path_2.

As shown in FIG. 6 , the optical path Path_1 corresponding to event 1 is reduced by S1 on the side of the first reflector 120-1 compared to Path_0, which is the optical path corresponding to event 0, and the second reflector Since the (140-1) side decreases by S1, the optical axis direction distance of the optical path Path_1 decreases by 2×S1 as a whole.

In this way, when the first reflector 120 and the second reflector 140 are respectively moved by D1 to be close to each other, the distance between the lens assembly 300 and the image sensor 400 is reduced by 2×S1, so this 2 A zoom or AF function corresponding to a distance of ×S1 may be implemented.

That is, according to the present invention, the distance in the optical axis direction between the lens assembly 300 and the image sensor 400 can be adjusted without moving the lens assembly 300 or the image sensor 400 in the optical axis direction as in the conventional method. have.

Furthermore, since distance reduction occurs at both sides of the first reflector 120 and the second reflector 140 at the same time, even if a relatively small distance is moved (D1), the movement displacement (2×S1) based on the actual optical axis direction is expanded Therefore, the driving performance can be improved. In addition, on the premise of moving the same distance, since the time required to move the corresponding distance is shortened, it is possible to further increase the time response characteristic (reaction speed) according to the driving.

In addition, in the case of the present invention, since the moving range for moving the moving object to implement AF is significantly shortened compared to the conventional method, power consumption corresponding thereto can also be reduced, so that the overall function related to AF is further improved. do.

A case in which the distance in the optical axis direction between the lens assembly 300 and the image sensor 400 is extended from the viewpoint corresponding to this will be described as follows.

The present invention does not move the movable body in the optical axis direction in order to extend the distance in the optical axis direction (the distance between the lens assembly and the image sensor), and as described above, the first reflector 120 and the second reflector 140 are Each is moved (D2) in a direction perpendicular to the optical axis (X-axis direction), but moved in a direction away from each other.

As shown in FIG. 6 , the optical path Path_2 corresponding to event 2 is increased by S2 on the side of the first reflector 120-2 compared to Path_0, which is the optical path corresponding to event 0, and the second reflector is Since the (140-2) side increases by S2, the total length of the optical path Path_2 is increased or extended by 2×S2 based on the distance in the optical axis direction compared to Path_0.

In this way, when the first reflector 120 and the second reflector 140 are moved apart by D2, respectively, the distance between the lens assembly 300 and the image sensor 400 increases by 2×S2. A zoom or AF function corresponding to a distance of 2×S2 may be implemented.

As described above, the present invention variably adjusts the length of the optical path from the lens assembly 300 to the image sensor 400 through the linear movement of the first reflector 120 and the second reflector 140 . AF or zoom function can be implemented.

7 is a view for explaining a process of implementing AF, etc. according to another embodiment of the present invention.

As described with reference to FIG. 6, the actuator of the present invention controls the first reflector 120 and the second reflector 140 to be close to each other or to move away from each other so that the first and second reflectors in the lens assembly 300 are It is configured to adjust the overall length of the optical path, which is the entire path reaching the image sensor 400 through the second reflectometers 120 and 140, and to implement AF and the like through this adjustment.

As an embodiment to implement this, the embodiment described with reference to FIG. 6 includes the first reflector 120 and the second reflector 140 by linearly moving the first reflector 120 and the second reflector 140 in a direction perpendicular to the optical axis. It corresponds to an embodiment in which the second reflector 140 is moved closer to or farther away from each other.

On the other hand, in the embodiment of the present invention shown in FIG. 7 , as in the embodiment described with reference to FIG. 6 , the first reflector 120 and the second reflector 140 are brought closer to or farther apart, but the first reflection This corresponds to an embodiment in which the moving directions of the system 120 and the second reflector 140 are oblique with respect to the optical axis.

In this way, even when the first reflector 120 and the second reflector 140 move in an oblique direction to move closer to each other or to move away from each other while moving in the opposite oblique direction, each movement as shown in FIG. Since the optical path according to the location is different from each other, it is possible to implement AF or the like as in the embodiment described with reference to FIG. 6 .

As described above, in order to move the first reflectometer 120 and the second reflectometer 140 in an oblique direction with respect to the optical axis, the first guide rail 111 and the second guide rail 112 provided in the housing 110 . ) is configured to have a shape extending in an oblique direction with respect to the optical axis, unlike the embodiment shown in FIG. 5 .

From a corresponding point of view, it faces the first guide rail 111 , faces the first groove rail 131 and the second guide rail 112 provided in the first carrier 130 , and faces the second carrier 150 . The provided second groove part rail 151 is also configured to have a shape extending in an oblique direction with respect to the optical axis.

The diagonal direction is a diagonal direction with respect to the XZ plane, and it is preferable to have an inclination of 45 degrees so that light introduced in the optical axis direction through precise reflection (refraction) of the optical path can flow out in the optical axis direction.

In the above, although the present invention has been described with reference to limited embodiments and drawings, the present invention is not limited thereto and will be described below with the technical idea of the present invention by those of ordinary skill in the art to which the present invention pertains. Of course, various modifications and variations are possible within the scope of equivalents of the claims.

In the above description of the present invention, modifiers such as 1st and 2nd are only instrumental terms used to relatively distinguish components from each other, so they are used to indicate a specific order, priority, etc. It should not be construed as a term that is

The accompanying drawings for the purpose of explaining the present invention and illustrating examples thereof may be shown in a somewhat exaggerated form in order to emphasize or highlight the technical contents of the present invention, but the above-described contents and matters shown in the drawings, etc. It should be construed as obvious that various types of modification application examples are possible at the level of those skilled in the art in consideration of this.

1000: camera module
100: actuator 110: housing
110-1: main housing 110-2: case
111: first guide rail 112: second guide rail
113: first opening 115: second opening
117-1: first hole 117-2: second hole
120: first reflector 130: first carrier
131: first groove rail 140: second reflector
150: second carrier 151: second groove rail
170: circuit board 180-1: first yoke
180-2: second yoke B1: first ball
B2 : 2nd ball C1 : 1st coil
C2: 2nd coil M1: 1st magnet
M2: second magnet H1: first position sensor
H2: second position sensor 200: reflectometer module
210: optical system 300: lens assembly

Claims (9)

a first reflector provided at the rear of the lens assembly and reflecting the light passing through the lens assembly;
a first carrier on which the first reflectometer is mounted;
a second reflector for reflecting the light incident from the first reflector toward the image sensor;
a second carrier on which the second reflectometer is mounted and moving independently of the first carrier;
a housing accommodating the first and second carriers; and
In order to adjust the length of a light path, which is an entire path of light flowing from the lens assembly to the image sensor through the first and second reflectors, the first and second carriers are first and second to be closer to or farther away from each other. An actuator for a camera comprising a driving unit for independently moving the first and second carriers. According to claim 1, wherein the driving unit,
a first magnet provided on the first carrier;
a second magnet provided on the second carrier;
a first coil facing the first magnet; and
Actuator for a camera, characterized in that it comprises a second coil facing the second magnet. According to claim 1, wherein the driving unit,
An actuator for a camera, characterized in that the first and second carriers are moved by the same distance in a direction adjacent to each other so that the length of the optical path is shortened. The method of claim 3, wherein the driving unit,
An actuator for a camera, characterized in that the first and second carriers are moved by the same distance in a direction away from each other so that the length of the optical path is extended. According to claim 1, wherein the first and second reflectometer,
An actuator for a camera, characterized in that the surfaces facing each other have an inclination of 45 degrees. 3. The method of claim 2,
first and second guide rails having a shape extending in a direction perpendicular to the optical axis or in a direction forming an oblique line with respect to the optical axis and provided in the housing;
a first groove part rail facing the first guide rail and provided in the first carrier;
a second groove part rail facing the second guide rail and provided in the second carrier;
a first ball disposed between the first guide rail and the first groove part rail; and
The actuator for a camera further comprising a second ball disposed between the second guide rail and the second groove part rail. 7. The method of claim 6,
a first yoke that generates an attractive force to the first magnet and is provided in the housing; and
The actuator for a camera, characterized in that it generates an attractive force to the second magnet and further comprises a second yoke provided in the housing. According to claim 1, wherein the housing,
a first opening formed in a portion facing the lens assembly; and
and a second opening formed in a portion facing the image sensor,
The first reflector reflects the light introduced through the first opening to the second reflector, and the second reflector reflects the light introduced from the first reflector to the image sensor through the second opening. Actuator for a camera, characterized in that. A camera module comprising the actuator for a camera according to any one of claims 1 to 8.

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