KR20180107633A - Actuator - Google Patents

Abstract

Disclosed is an actuator which can move in a planar linear motion while first and second carriers are stably supported on a base, and can further improve the reliability through precise control. To this end, the actuator comprises: a base on which a light through hole is formed; an upper coil installed on one surface of the base; a first carrier having an upper magnet positioned to face the upper coil, and moving in a planar linear motion along one surface of the base by the upper coil and the upper magnet; a lower coil mounted on the other surface of the base; and a second carrier having a lower magnet positioned to face the lower coil, and moving in a planar linear motion to be perpendicular to the first carrier along the other surface of the base by the lower coil and the lower magnet.

Description

Actuator

The present invention relates to an actuator capable of moving in a straight line in a state in which a first carrier and a second carrier are stably supported on a base, and further improving reliability through precise control.

2. Description of the Related Art [0002] With the recent development of compact and lightweight digital cameras, mobile communication terminals equipped with optical lenses and camera elements have become popular. In the camera lens assembly mounted on such a mobile communication terminal, a shake correction apparatus for correcting vibration such as trembling is applied to capture a clear image.

Generally, the shake correction apparatus can be classified into DIS (Digital Image Stabilization), EIS (Electronic Image Stabilization), and optical image stabilization (OIS), which are electronic image stabilization techniques.

The electronic shake correction technique detects shaking from the result of the shot image and corrects the data stored in the camera element or the memory. The camera element accepts the disturbed image as it is and adjusts the position and the color by an electronic method or program It is a way to produce images without distortion.

The electronic shake correction technique has a merit that a separate mechanical and physical structure is unnecessary, and its price is low and its structural limit is low, so that it is easy to adopt. However, there is a problem that a separate memory or a high performance camera device is required because it is corrected by a program.

In addition, since the electronic shake correction technique takes a long time to correct an image that has already been disturbed, the photographing speed may be slowed down, and there is a limitation in removing afterimages through a program.

The optical image stabilizer corrects an image of a subject formed on a camera element without shaking by detecting the user's shake to change the position of the optical lens or the camera element.

However, since it is possible to remove the residual image by concealing an image without disturbance on the camera element, it is possible to reduce the correction factor Can be maintained at 90% or more.

In addition, the optical shake correction apparatus is advantageous in that it can shoot a clearer image than a device using an electronic shake correction apparatus under the condition that a camera element having the same performance is used. Accordingly, in recent years, optical shake correction apparatuses have been used more frequently in electronic photographing apparatuses requiring high resolution than electronic shake correction apparatuses.

An object of the present invention is to provide an actuator which can move in a straight line in a state in which the first carrier and the second carrier are stably supported on the base, and can further improve reliability through precise control.

According to an aspect of the present invention, there is provided an actuator including: a base having a light passage hole; An upper coil installed on one surface of the base; A first carrier having an upper magnet positioned to face the upper coil and moving in a plane linearly along one side of the base by the upper coil and the upper magnet; A lower coil mounted on the other surface of the base; And a second carrier having a lower magnet positioned to face the lower coil and moving in a plane and perpendicular to the first carrier along the other side of the base by the lower coil and the lower magnet.

An upper bearing member located between one side of the base and the first carrier to support the first carrier to move along one side of the base; And a lower bearing member located between the other surface of the base and the second carrier to support the second carrier to move along the other surface of the base.

An upper rail installed on one side of the base and the first carrier to guide a straight running of the upper bearing member; And a lower rail installed on the other surface of the base and the second carrier, respectively, for guiding straight running of the lower bearing member.

The upper rail includes a first main upper rail installed at one side of the upper coil and having a groove extending along the moving direction of the first carrier; And a first auxiliary upper rail installed at one side of the upper magnet so as to face the first main upper rail and having a groove extending along the moving direction of the first carrier, A first main lower rail installed at one side of the first carrier and having a groove extending along the moving direction of the second carrier; And a first auxiliary lower rail installed at one side of the lower magnet so as to face the first main lower rail and having a groove extending along the moving direction of the second carrier.

Wherein the first bearing member includes a plurality of first balls positioned to correspond to a direction of movement of the first carrier along one side of the base and the second bearing member includes a second bearing And a plurality of second balls positioned to correspond to the moving direction.

And a retainer for keeping a distance between the plurality of first balls and the second balls constant.

The upper and lower Hall sensors are disposed on both sides of the upper magnet with respect to the moving direction of the first carrier and the lower hall sensors are disposed on both sides of the lower magnet with respect to the moving direction of the second carrier. As shown in FIG.

The substrate may include a body provided on the other surface of the base and having a surface perpendicular to a virtual optical axis direction passing through the light passing hole; An upper blade which is bent from the body toward an upper portion and penetrates through one surface of the base and is mounted so as to face the upper hall sensor; And a lower blade which is bent from the body toward the lower portion and exposed to the other surface of the base, and is mounted so that the lower hall sensor faces each other.

And a second region between the base and the first carrier, or a second region between the base and the first carrier, or a second region between the base and the second carrier, wherein at least one coil of the upper coil or the lower coil To the substrate.

The substrate may include a first substrate fixedly installed between the base and the first carrier and applying a current to at least one of the upper coil and the lower coil; And a second substrate which is fixed between the base and the second carrier and on which a Hall sensor for sensing the positions of the first and second carriers is mounted.

The first carrier and the second carrier may be linearly controlled by the upper hall sensor and the lower hall sensor or may be linearly controlled by the hall sensor.

An upper stopper protruding from one surface of the base to be positioned on both sides of the first carrier and restricting the planar linear movement of the first carrier; And a lower stopper protruding from the other side of the base so as to be positioned on both sides of the second carrier and restricting the planar linear movement of the second carrier.

The upper coil and the lower coil are each provided in a pair such that they face each other with respect to the light passage hole and the upper magnet and the lower magnet are respectively provided in pairs corresponding to the upper coil and the lower coil .

The first carrier and the second carrier may be equipped with a lens barrel including a lens group consisting of at least one lens.

The configuration and structure of the actuator according to an embodiment of the present invention can improve the power consumption required for the relative movement between each carrier and the base. Further, since each of the carriers can move along an accurate linear trajectory, the error in the X axis and the Y axis can be minimized and accurate driving is possible.

In addition, it is possible to accurately sense the position of each carrier (or the lens barrel mounted on the first carrier). In addition, the responsiveness of the lens barrel mounted on each carrier can be improved, and the lifetime of the actuator can be extended by moving each carrier in a stably supported state.

1 is a perspective view illustrating an actuator according to an embodiment of the present invention.
2 is an exploded perspective view illustrating an actuator according to an embodiment of the present invention.
3 is an exploded perspective view showing an actuator according to an embodiment of the present invention on a bottom surface thereof.
4 is a cross-sectional view taken along the line AA shown in Fig.
5 is a cross-sectional view taken along the line BB in Fig.
6 is an enlarged view of the second substrate shown in Fig.
Fig. 7 is an enlarged view of the base shown in Fig. 2. Fig.
FIG. 8 is a graph showing hole voltages according to displacement of a Hall sensor of an actuator according to an embodiment of the present invention.
9 is a plan view of the actuator according to an embodiment of the present invention, in which the cover of the actuator is omitted.
FIGS. 10 and 11 are plan views for explaining the operation of the first carrier shown in FIG.

Before describing the present invention in detail, a method of describing the present specification and drawings will be described.

It is to be understood that the terminology used herein should be broadly interpreted as encompassing any and all of the terms, as well as the legal and technical interpretations of technicians skilled in the art, The appearance of the technology, and the like. In addition, some terms are arbitrarily selected by the applicant. These terms may be construed in the meaning defined herein and may be interpreted based on the general contents of this specification and the ordinary technical knowledge in the art without specific terms definition.

In addition, the same reference numerals or signs in the drawings attached to the present specification indicate components or components that perform substantially the same function. For ease of explanation and understanding, different embodiments will be described using the same reference numerals or symbols. That is, even though all of the elements having the same reference numerals are shown in the plural drawings, the plural drawings do not mean one embodiment.

Further, in the present specification and claims, terms including ordinal numbers such as "first "," second ", etc. may be used for distinguishing between elements. These ordinals are used to distinguish between identical or similar components, and the use of such ordinal numbers should not be construed as limiting the meaning of the term. For example, the components associated with such an ordinal number should not be limited in their order of use or placement order by their numbers. If necessary, each ordinal number may be used interchangeably.

As used herein, the singular forms "a", "an" and "the" include plural referents unless the context clearly dictates otherwise. In this application, the terms "comprise", "comprising" and the like are used to specify that there is a stated feature, number, step, operation, element, component, or combination thereof, But do not preclude the presence or addition of features, numbers, steps, operations, components, parts, or combinations thereof.

Further, in an embodiment of the present invention, when a part is connected to another part, this includes not only a direct connection but also an indirect connection through another medium. Also, the meaning that a part includes an element does not exclude other elements, but may include other elements, unless specifically stated otherwise.

The actuator of the present invention can be used in LiDAR (Light Detection And Ranging) technology of an unmanned vehicle. LiDAR irradiates laser pulses on the surface and detection range of the object to be photographed using a shorter wavelength (near infrared range) than the existing LaDAR (Laser Detection and Ranging) Is a new technology measuring the properties of. LiDAR technology is used in archeology / geography / geology / atmospheric physics and remote sensing.

For example, the LiDAR sensor system consists of a laser transmission module, a laser detection module, a signal acquisition and processing module, and a data transmission / reception module. The laser signals are modulated according to a time of flight (ToF) Can be distinguished.

The ToF method measures the distance by measuring the time during which the emitted laser pulse signal is reflected from the object within the measurement range to the receiver. The PS method emits a laser beam continuously modulated at a specific frequency, The principle of calculating the time and distance by measuring the amount of phase change of the reflected signal.

Especially, when the distance of the object is sensed or the 3D image is implemented using the laser scanner in real time during the movement of the unmanned vehicle, faster data collection is required. For this purpose, it is necessary to be able to simultaneously measure the viewing angle in a specific direction by using a laser and a receiving element. That is, the actuator of the present invention can be used for driving a carrier mounted with a lens barrel including a lens for adjusting the irradiation direction of the laser.

In addition, the actuator of the present invention can be applied to a camera lens module mounted on a drone (for example, an unmanned airplane, an unmanned aerial vehicle, an unmanned robot, etc.) or an ultra-small camera lens module for mobile devices.

Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.

2 is an exploded perspective view illustrating an actuator according to an embodiment of the present invention. FIG. 3 is a cross-sectional view illustrating an actuator according to an exemplary embodiment of the present invention. Referring to FIG. 1, Fig. 4 is a cross-sectional view taken along the line A-A shown in Fig. 1, and Fig. 5 is a cross-sectional view taken along the line B-B shown in Fig.

1 to 5, an actuator 100 according to an embodiment of the present invention includes a base 10 on which a light passage hole 15 is formed, a first carrier 30 located on one side of the base 10, And a second carrier (40) located on the other side of the base (10).

The upper coil 22 may be mounted on one side (upper surface) of the base 10 and the upper magnet 24 may be mounted on the first carrier 30 and positioned to face the upper coil 22. The upper coils 22 may be provided as a pair 22a and 22b so as to face each other with respect to the light passing hole 15 and the upper magnet 24 may be provided at a position corresponding to each of the upper coils 22 (24a, 24b).

The lower coil 42 may be mounted on the other surface of the base 10 and the lower magnet 44 may be mounted on the second carrier 40 to face the lower coil 42 . The lower coils 42 may be provided as a pair 42a and 42b so as to face each other with the light passage hole 15 as a center and the lower coils 42 may be vertically positioned to intersect the upper coil 22 . The lower magnets 44 may be provided as a pair 44a and 44b at positions corresponding to the lower coil 42, respectively.

The upper coil 22 is mounted on the upper surface of the base 10 and the upper magnet 24 is inserted into the first magnet receiving groove 38 formed in the first carrier 30, ). The lower coils 42 are mounted on the lower surface of the base 10 and the lower magnets 44 are inserted into the second magnet receiving grooves 48 formed in the second carrier 40 and fixed to the second carrier 40 .

Accordingly, when current is applied to the upper coil 22, the first carrier 30 can move linearly in a direction perpendicular to the optical axis (Z-axis direction). Further, the second carrier 40 can move linearly in a direction perpendicular to the first carrier 30 (X-axis direction).

The upper coil 22 and the lower coil 42 may have a donut shape and may be respectively wound on a yoke (not shown). The yoke may be formed to have a width wider than the widths of the upper and lower coils 22 and 42. Accordingly, the strength of the magnetic field formed between the upper coil 22 and the upper magnet 24, between the lower coil 42 and the lower magnet 44 can be increased and the magnetic field can be expanded.

The upper coil 22 and the lower coil 42 may be provided as a pair 22a, 22b, 42a and 42b respectively and the upper magnet 24 and the lower magnet 44 may be provided as a pair of upper coil 22 and lower coil 22. [ (24a, 24b, 44a, 44b) so as to correspond to the first and second guide grooves 42, respectively.

When the upper magnet 24 and the lower magnet 44 are moved together by the movement of the first carrier 30 and the second carrier 40, the upper coil 22 and the lower coil 42 are moved The upper magnet 24 and the lower magnet 44 may have a width larger than the upper magnet 24 and the lower magnet 44 so that a stable magnetic field between the lower magnet 24 and the lower magnet 44 is maintained.

The first carrier 30 and the second carrier 40 may have openings corresponding to the light passage holes 15 respectively and each opening may include a lens barrel 35 having a lens group consisting of at least one or more lenses , And 45, respectively.

The actuator 100 according to an embodiment of the present invention further includes upper bearing members 61 and 62, lower bearing members 63 and 64, upper rails 50 and 51 and lower rails 52 and 53 .

The upper bearing members 61 and 62 may be positioned between the upper surface of the base 10 and the lower surface of the first carrier 30 to support the first carrier 30 to move along the upper surface of the base 10. The lower bearing members 63 and 64 may be positioned between the lower surface of the base 10 and the upper surface of the second carrier 40 to support the second carrier 40 to move along the lower surface of the base 10. [ have.

The upper rails 50 and 51 are installed on the upper surface of the base 10 and on the lower surface of the first carrier 30 to guide the straight running of the upper bearing members 61 and 62, So that one side and the other side of the first carrier 30 can be respectively supported. The lower rails 52 and 53 are installed on the lower surface of the base 10 and on the upper surface of the second carrier 40 so as to guide the straight running of the lower bearing members 63 and 64 and the lower rails 52 and 53 May be provided in a pair so as to be parallel to each other to support one side and the other side of the second carrier 40, respectively.

For convenience of explanation, the upper rails 50a and 51a and the lower rails 52a and 53a, the upper bearing member 61 and the lower bearing member 63 located at one side will be described and the upper rail 50b The upper and lower rails 52a and 53b and the upper and lower rails 52b and 53b and the upper bearing member 62 and the lower bearing member 64 are integrally formed with the upper rails 50a and 51a and the lower rails 52a and 53a, And the lower bearing member 63, as shown in Fig. However, the upper rails 50b and 51b and the lower rails 52b and 53b located on the other side may have different sizes from the upper rails 50a and 51a and the lower rails 52a and 53a located on one side, The number of the upper bearing member 62 and the lower bearing member 64 disposed in the lower portion of the lower bearing member 62 can be appropriately adjusted.

The upper rails 50a and 51a may include a first main upper rail 50a provided on the upper surface of the base 10 and a first auxiliary upper rail 51a provided on the lower surface of the first carrier 30. [ have. The first main upper rail 50a is located at one side of the upper coil 22a and may be formed with a groove extending along the moving direction of the first carrier 30. [ The first auxiliary upper rail 51a is located at one side of the upper magnet 24a and a groove symmetrical to the first main upper rail 51a may be formed.

However, when two X-axis moving rails are provided, the first auxiliary upper rail 51a and the first main upper rail 50a located at one side may be respectively formed with a V-shaped groove, The auxiliary upper rail 51b may have a V-shaped groove and the second main upper rail 50b may have a C-shaped groove. This is because it is possible to prevent a contact point on which one of the rails 50 and 51 is lifted due to the mechanical tolerance when the V-shaped grooves are formed in both the rails 50 and 51 mechanically.

The lower rails 52a and 53a may include a first main lower rail 52a provided on the lower surface of the base 10 and a first auxiliary lower rail 53a provided on the upper surface of the second carrier 40 have. The first main lower rail 52a is located at one side of the lower coil 42a and may have a groove extending along the moving direction of the second carrier 40. [ The first auxiliary lower rail 53a is located at one side of the lower magnet 44a and a groove symmetrical to the first main lower rail 52a may be formed.

The upper bearing member 61 may be at least one first ball 61 positioned between the first main upper rail 50a and the first auxiliary upper rail 51a, (61a, 61b, 61c) along the longitudinal direction of each of the first and second electrodes (50a, 51a). The lower bearing member 63 may be at least one second ball 63 positioned between the first main lower rail 52a and the first auxiliary lower rail 53a, 63a, 63b, 63c along the longitudinal direction of the lower rails 52a, 53a.

That is, the upper rails 50a and 51a are formed to allow relative movement of the first balls 61a, 61b and 61c with respect to the base 10 in the Y-axis direction, and the lower rails 52a and 53a are formed in the X- Relative movement of the second balls 63a, 63b, 63c relative to the base 10 is permitted. The first balls 61a, 61b and 61c and the second balls 63a, 63b and 63c are connected to the upper rails 50a and 50b, respectively, when the first carrier 30 and the second carrier 40 move from the base 10, respectively. 51a and the lower rails 52a, 53a in rolling contact with each other.

 This can improve the power consumption required for the relative movement between the first carrier 30 and the base 10 and between the second carrier 40 and the base 10.

The first carrier 30 and the second carrier 40 are guided by the upper rails 50a and 51a and the lower rails 52a and 53a when they reciprocate linearly along the Y axis and the X axis direction, It is possible to precisely drive the first carrier 30 and the second carrier 40 by minimizing errors in the X and Y axes. Therefore, the reliability of the product can be improved and the drive loss can be reduced.

It is possible to improve the responsiveness of the lens barrels 35 and 45 mounted on the first carrier 30 and the second carrier 40 and to improve the responsiveness of the first carrier 30 and the second carrier 40 It is possible to extend the service life of the actuator 100 by moving the actuator 100 in a stably supported state.

Further, the actuator 100 according to an embodiment of the present invention may further include an upper cover 94 and a lower cover 92. The upper cover 94 and the lower cover 92 may be coupled to the base 10 to cover the upper and lower surfaces of the base 10, respectively. In addition, it is possible to prevent the first and second carriers 30 and 50 from being separated from the base 10 in the event of a strong impact from the outside. Even if the upper cover 94 or the lower cover 92 is separated from the base 10, the flow space (minute gap) between the first and second carriers 30, 50 and the bearing members 61, 63 So that the separation between the bearing members 61, 63 and the rails 50, 51, 52, 53 due to an external impact can be prevented in advance.

A material such as steel which can shield the electromagnetic effect from the outside and is advantageous for shielding electromagnetic waves can be used. The upper cover 94 and the lower cover 92 may correspond to the shape and size of the base, respectively.

The actuator 100 according to an embodiment of the present invention may further include a first substrate 80 and a second substrate 70.

The first substrate 80 may be fixedly mounted between the base 10 and the first carrier 30. The first substrate 80 may be electrically connected to the upper coil 22 and the lower coil 42 to apply a current to at least one of the upper coil 22 and the lower coil 42. The upper coil 22 and the lower coil 42 can generate a driving force by interaction with the upper magnet 24 and the lower magnet 42 by receiving a current from the first substrate 80. [

The second substrate 70 may be fixedly mounted between the base 10 and the second carrier 40. The second substrate 70 may be mounted with a plurality of Hall sensors 73a, 73b, 78a, 78b for sensing the positions of the first carrier 30 and the second carrier 40. [ The Hall sensors 73a, 73b, 78a, and 78b may be positioned forward and backward with respect to the moving direction of the upper magnet 24 and the lower magnet 44, respectively, and electrically connected to the second substrate 70 .

The hall sensors 73a, 73b, 78a and 78b are arranged at the positions of the first carrier 30 and the second carrier 40 (or the positions of the lenses mounted on the first carrier 30 and the second carrier 40) And it is possible to calculate the direction and travel distance in which the first carrier 30 and the second carrier 40 should be moved based on the position information of the sensed lens. The structure and characteristics of the second substrate 70 will be described in detail with reference to the accompanying drawings.

Meanwhile, openings may be formed in the first and second substrates 80 and 70 at positions corresponding to the light passage holes 15, respectively. In addition, the first substrate 80 and the second substrate 70 may be a flexible substrate (FPCB).

Fig. 6 is an enlarged view of the second substrate shown in Fig. 2, and Fig. 7 is an enlarged view of the base shown in Fig. FIG. 8 is a graph showing hole voltages according to displacement of a Hall sensor of an actuator according to an embodiment of the present invention.

6 and 7, the second substrate 70 may include a body 75, upper wings 72a and 72b, and lower wings 77a and 77b. The body 75 is provided on the lower surface of the base 10 and may have a surface perpendicular to the optical axis direction. The upper wings 72a and 72b may include a first upper wing 72a and a second upper wing 72b that are respectively bent upward from the body 75 and positioned to be parallel to each other.

The first upper wing 72a and the second upper wing 72b are mounted with hole sensors 73a and 73b on their inner surfaces facing each other. The first upper blade 72a and the second upper blade 72b may be respectively inserted into the through holes 19 formed in the base 10 and exposed from the upper surface of the base 10. The hall sensors 73a and 73b mounted on the first upper blade 72a and the second upper blade 72b may be positioned forward and backward with respect to the moving direction of the upper magnet 24a, respectively.

The lower vanes 77a and 77b may be respectively bent from the body 75 downward and positioned perpendicular to the upper vanes 72a and 72b. The lower vanes 77a and 77b may include a first lower vane 77a and a second lower vane 77b positioned to be parallel to each other.

The first lower wing 77a and the second lower wing 77b are mounted with hole sensors 78a and 78b on their inner surfaces facing each other. The first lower wing 77a and the second lower wing 77b may be exposed from the lower surface of the base 10. The hall sensors 78a and 78b mounted on the first lower blade 77a and the second lower blade 77b may be positioned respectively forward and rearward with respect to the moving direction of the lower magnet 44a.

That is, as the hole sensors 73a, 73b, 78a, 78b are positioned forward and backward with respect to the moving direction of the first carrier 30 and the second carrier 40, Accuracy of the first carrier 30 and the second carrier 40 can be improved since linear control can be performed by sensing the position of the second carrier 40 accurately.

More specifically, referring to Table 1 and FIG. 8 below, the hole voltages of the first upper hole sensor 78a and the second upper hole sensor 78b (the first upper portion and the second upper portion) Output voltage of the second upper hall sensor) is as follows. That is, when the displacement ratio is 0.5, the sensing is performed through the first upper hall sensor 78a. When the displacement ratio is 0.5 or less, the sensing is performed through the second upper hall sensor 78b and the first carrier 30 ) Can be accurately sensed. On the other hand, when the displacement ratio is 0.5, it may be sensed by either the first upper hall sensor 78a or the second upper hall sensor 78b or may be sensed at the same time.

The hall sensor located on one side of the first carrier 30 may be defined as a first upper hall sensor 78a and the hall sensor located on the other side of the first carrier 30 may be defined as a second upper hall sensor 78b, .

Displacement ratio The first upper hall sensor The second upper hall sensor 1.00 1,000 0.000 0.95 0.809 0.009 0.90 0.663 0.019 0.85 0.549 0.030 0.80 0.457 0.043 0.75 0.383 0.057 0.70 0.322 0.073 0.65 0.271 0.091 0.60 0.229 0.111 0.55 0.192 0.134 0.50 0.161 0.161 0.45 0.134 0.192 0.40 0.111 0.229 0.35 0.091 0.271 0.30 0.073 0.322 0.25 0.057 0.383 0.20 0.043 0.457 0.15 0.030 0.549 0.10 0.019 0.663 0.05 0.009 0.809 0.00 0.000 1,000

That is, when only one hall sensor is used, precise control is difficult in a region where the variation width of the hole voltage is smaller than the variation width of the displacement.

8, the actuator 100 according to an exemplary embodiment of the present invention includes hole sensors 78a and 78b disposed at the front and rear of the first carrier 30, respectively, There is no region where the variation width of the voltage is small, so that there is an advantage that relatively precise control can be performed.

On the other hand, the output voltage of the hall sensor can be changed to digital and the displacement can be controlled in steps.

The first substrate 80 serves as a current supply line for supplying current to the upper coil 22 and the lower coil 42 and the second substrate 70 serves as a current supply line for supplying current to the upper coil 22 and the lower coil 42. [ And serves to sense the movement position of the carrier 40. Therefore, the current applied to the first substrate 80 and the second substrate 70 can be separately controlled to minimize interference, as compared with the case of using the conventional one substrate.

The actuator 100 according to an embodiment of the present invention may further include a magnet for Hall sensors (38a and 38b in FIG. 8) installed in the first carrier 30. FIG. The magnet sensors 38a and 38b for the Hall sensors are fixedly installed on the outer surface of the first carrier 30 and can move together with the first carrier 30. The upper magnet 30a, And can be located on both sides of the side wall 24a.

Further, although not shown, the second carrier 40 may further include a magnet for a hall sensor, and the magnet for Hall sensors provided in the second carrier 40 may be positioned on both sides of the lower magnet 44a have. The magnet for Hall sensors provided in the second carrier 40 may be positioned so as to face the Hall sensors 78a and 78b provided in the second vanes 77a and 77b.

The actuator according to an embodiment of the present invention may further include retainers 55a and 55b. The upper bearing members 61 and 62 and the lower bearing members 63 and 64 may be positioned such that the first carrier 30 and the second carrier 40 are in a horizontal direction perpendicular to the optical axis.

The upper bearing member 61 may be provided with a plurality of balls 61a, 61b and 61c at different positions. The retainers 55a are arranged horizontally with the optical axis and the balls 61a, 61b and 61c can be inserted into a plurality of receiving holes formed at regular intervals in the retainer 55a. In this case, each ball 61a, 61b, 61c is kept at a constant distance from each other through the retainer 55a, so that the first carrier 30 can prevent tilting in the direction perpendicular to the optical axis.

On the other hand, the balls 61a, 61b and 61c can be positioned so as to uniformly contact the base 10 and the first carrier 30 along the moving direction. That is, the retainers 55 may be omitted, and the balls 61a, 61b, and 61c may be arranged so as to be in contact with each other along the horizontal direction.

The actuator 100 according to an embodiment of the present invention may further include a stopper 60 and a guide pin 17. For example, the stopper 60 may protrude from the upper surface of the base 10 so as to be positioned on the movement path of the first carrier 30, respectively. The stopper 60 is positioned at predetermined intervals around the light passage hole 15, thereby limiting the range of movement of the first carrier 30. [ In addition, the stopper 60 may protrude from the lower surface of the base 10 so as to be positioned on the movement path of the second carrier 40, respectively.

The guide pins 17 may be provided on the upper surface or the lower surface of the base 10, respectively. The base 10 and the upper cover 94 can be easily coupled to each other by setting the coupling position of the upper cover 94 and the base 10 through the guide pin 17 located at the upper portion.

FIG. 9 is a plan view showing a state in which a cover of an actuator according to an embodiment of the present invention is omitted, and FIGS. 10 and 11 are plan views for explaining an operation process of the first carrier shown in FIG.

Hereinafter, a driving process of an actuator according to an embodiment of the present invention will be described. The 'forward direction' of the first carrier 30, which will be described below, is a direction in which the spacing between one side of the Hall sensor 73a located on one side of the base 10 and the opposite side of the first carrier 30 is increased 1 direction of the first carrier 30 is defined as a direction in which the Hall sensor 73a located on one side of the base 10 and the first carrier 30 Is defined as a direction in which the first carrier (30) moves in a direction in which the gap on one side decreases. Hereinafter, for convenience of explanation, the driving relationship between the coil 22a located on one side and the magnet 24a facing the coil 22a will be mainly described.

Referring to FIG. 9, the actuator 100 according to an embodiment of the present invention may further include magnet sensors 38a and 38b for Hall sensors installed in the first carrier 30. As described above, the first upper wing 72a and the second upper wing 72b are provided with hall sensors 73a and 73b, respectively, on the inner side facing each other. The first upper hall sensor 73a may be positioned on the first upper blade 72a and the second upper hall sensor 73b may be positioned on the second upper hall sensor 73a to face the first upper hall sensor 73a. And can be located in the wing 72b.

The magnets 38a and 38b for Hall sensors may be provided on the outer surface of the first carrier 30, respectively. The magnet sensors 38a and 38b for the Hall sensors include a first Hall sensor magnet 38a facing the first upper hall sensor 73a and a second Hall sensor magnet 38b facing the second upper Hall sensor 73b ).

The upper hall sensors 73a and 73b are provided in the forward direction and the backward direction of the first carrier 30 and the magnet sensors 38a and 38b for moving the hall sensor, And are provided so as to face the sensors 73a and 73b, respectively. The upper hall sensors 73a and 73b precisely sense the magnetic force of the hall sensor magnets 38a and 38b by forward or backward movement of the first carrier 30 so that the sensed signal is transmitted to the actuator 100 To a control unit (not shown) of an electronic device (not shown) installed.

The control unit can control the advancing distance of the first carrier 30 through signals from the upper hall sensors 73a and 73b. For example, when the forward or backward movement distance of the first carrier 30 is set, the control unit can control the current of the top coil 22 to move the first carrier 30. [ On the other hand, when the actuator 100 is in the stopped state, the gap d1 between the magnet sensors 38a and 38b and the upper hall sensors 73a and 73b facing the magnet may be the same.

Referring to FIG. 10, when current is applied to the upper coil 22a in one direction, an electromagnetic force is generated between the upper magnet 42a and the upper coil 22a, and the upper magnet 24a is pushed forward. Thus, the first carrier 30 can be driven forward in the Y-axis direction perpendicular to the optical axis. When the first carrier 30 is driven forward, the distance d3 between the first upper hall sensors 73a facing the first hall sensor magnet 38a increases and the gap d3 between the second hall sensor magnet 38b The interval d2 between the second upper hall sensors 73b facing the second upper hall sensor 73b decreases.

11, the backward movement of the first carrier 30 causes the current applied to the upper coil 22a to be applied to the upper carrier 22a and the upper magnet 22a in a direction opposite to the forward movement of the first carrier 30, An electromagnetic force is generated between the first carrier 30 and the first carrier 30 in the direction opposite to the advancement of the first carrier 30 and the upper magnet 24a is pushed backward in the reverse direction of the advancement of the first carrier 30. [

Accordingly, the first carrier 30 can be driven backward in the Y-axis direction perpendicular to the optical axis. The distance d2 between the first Hall sensor magnet 38a and the first upper Hall sensor 73a decreases and the second Hall sensor magnet 38b And the distance d3 between the second upper hall sensors 73b increases.

Generally, a Hall sensor is for sensing a magnetic flux density, and a magnetic field sharply decreases in inverse proportion to the square of the distance. That is, the hall sensor has a disadvantage in that it is difficult to sense the magnetic field as the distance between the magnets increases.

The actuator 100 according to the embodiment of the present invention is configured such that when the distance between the first hall sensor magnet 38a and the first hall sensor 73a increases as the first carrier 30 advances, The interval between the magnet for the hall sensor 38b and the second hall sensor 73b decreases. When the gap between the first Hall sensor magnet 38a and the first Hall sensor 73a decreases as the first carrier 30 moves backward, the magnet for the second Hall sensor 38b, The distance between the first and second electrodes 73a and 73b increases.

 That is, since the first hall sensor 73a and the second hall sensor 73b are provided on the movement path of the first carrier 30, the first carrier 30 (or the first carrier 30 The lens barrel 35) can be accurately sensed.

Since the second carrier 40 is different from the moving direction of the first carrier 30 only in the direction perpendicular to the X axis, the description of the movement and sensing operation of the second carrier 40 is omitted .

In recent years, intelligent automobiles and smart cars are demanding the active coping function of the vehicle against unexpected situations. In other words, it is necessary to confirm beforehand the situation that the safety of the driver and the pedestrian is threatened such as recognition of the sudden appearance of the pedestrian, detection of the obstacle in the out of the range of illumination in the dark at night, .

In response to such a demand, a windshield or a vehicle installed in front of the vehicle to detect an object in front of the vehicle when the vehicle moves based on the self-emitted light not only warns the driver in advance, The image is transmitted to an electronic control unit (ECU) of the vehicle, and the ECU performs various controls using the image. Such an image is called a scanner.

As the scanner, a radio detection and ranging (RaDAR) device was used. A radar is a radio monitoring device that emits an electromagnetic wave of microwave (microwave, 10 cm to 100 cm wavelength) to an object and receives the electromagnetic wave reflected from the object to find the distance, direction, altitude and the like to the object.

On the other hand, scanners using light detection and ranging (LiDAR) are being developed. A rider is a device that measures a distance or an atmospheric phenomenon by emitting pulsed laser light into the atmosphere and using the reflector or scatterer, and is also called a laser radar.

That is, it is important to stably increase the scan speed according to the moving speed of the vehicle and the moving object, thereby ensuring a constant level of resolution and a consistent image.

 In this case, since the lens for irradiating light moves more than several hundreds of millions of times, it must be driven in a state of being stably supported.

The actuator 100 according to the embodiment of the present invention is provided with lens barrels 35 and 45 including lenses for adjusting the irradiation direction so that light such as a laser beam can be simultaneously measured with respect to a viewing angle in a specific direction Can be used to drive the carriers 30,

As described above, the relative movement between the first carrier 30 and the base 10, the second carrier 40, and the base 10 through the structure and structure of the actuator 100 according to an embodiment of the present invention The required power consumption can be improved. In addition, since it can move along an accurate linear trajectory, it is possible to precisely drive by minimizing errors in the X and Y axes.

The position of each of the carriers 30, 40 (or the lens barrels 35, 45) can be accurately sensed. The response of the lens barrels 35 and 45 mounted on the first carrier 30 and the second carrier 40 can be improved and the first carrier 30 and the second carrier 40 can be stably It is possible to extend the service life of the actuator 100 by moving it in a supported state.

 Therefore, the reliability of the actuator 100 according to the embodiment of the present invention can be improved, and the drive loss can be minimized.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed exemplary embodiments, but, on the contrary, It will be understood by those skilled in the art that various changes in form and detail may be made therein without departing from the spirit and scope of the present invention.

10: Base 15: Light passing hole
22: upper coil 24: upper magnet
30: first carrier 35, 45: lens barrel
40: second carrier 50, 51: upper rail
52, 53: lower rail 55, 65,: retainer
70: second substrate 80: first substrate
92: lower cover 94: upper cover
100: Actuator

Claims (14)

A base on which a light passage hole is formed;
An upper coil installed on one surface of the base;
A first carrier having an upper magnet positioned to face the upper coil and moving in a plane linear direction along one side of the base by the upper coil and the upper magnet;
A lower coil mounted on the other surface of the base; And
And a second carrier having a lower magnet positioned to face the lower coil and moving in a planar linear direction perpendicular to the first carrier along the other side of the base by the lower coil and the lower magnet. The method according to claim 1,
An upper bearing member located between one side of the base and the first carrier to support the first carrier to move along one side of the base;
Further comprising a lower bearing member located between the other side of the base and the second carrier to support the second carrier to move along the other side of the base. 3. The method of claim 2,
An upper rail installed on one side of the base and the first carrier to guide a straight running of the upper bearing member; And
Further comprising a lower rail installed on the other side of the base and the second carrier for guiding straight running of the lower bearing member. The method of claim 3,
Wherein the upper rail comprises:
A first main upper rail installed at one side of the upper coil and having a groove extending along the moving direction of the first carrier; And
And a first auxiliary upper rail installed on one side of the upper magnet so as to face the first main upper rail and having a groove extending along the moving direction of the first carrier,
Wherein the lower rail comprises:
A first main lower rail installed at one side of the lower coil and having a groove extending along a moving direction of the second carrier; And
And a first auxiliary lower rail installed on one side of the lower magnet so as to face the first main lower rail and having a groove extending along the moving direction of the second carrier. 3. The method of claim 2,
The first bearing member includes a plurality of first balls positioned to correspond to a moving direction of the first carrier along one side of the base,
Wherein the second bearing member includes a plurality of second balls located along a second side of the base to correspond to a direction of movement of the second carrier. 6. The method of claim 5,
Further comprising a retainer to maintain a constant spacing of the plurality of first balls and the second balls. The method according to claim 1,
The upper and lower Hall sensors are disposed on both sides of the upper magnet with respect to the moving direction of the first carrier and the lower hall sensors are disposed on both sides of the lower magnet with respect to the moving direction of the second carrier. ≪ / RTI > 8. The method of claim 7,
Wherein:
A body provided on the other surface of the base and having a surface perpendicular to a virtual optical axis direction passing through the light passing hole;
An upper blade which is bent from the body toward an upper portion and penetrates through one surface of the base and is mounted so as to face the upper hall sensor; And
And a lower blade that is bent so as to be bent from the body toward the lower side and exposed to the other surface of the base, and is mounted so that the lower hall sensor faces each other. The method according to claim 1,
And a second region between the base and the first carrier, or a second region between the base and the first carrier, or a second region between the base and the second carrier, wherein at least one coil of the upper coil or the lower coil Further comprising a substrate to which said substrate is applied. 10. The method of claim 9,
Wherein:
A first substrate fixedly installed between the base and the first carrier and applying a current to at least one of the upper coil and the lower coil; And
And a second substrate which is fixed between the base and the second carrier and on which a Hall sensor for sensing the position of the first carrier and the second carrier is mounted. 11. The method according to claim 7 or 10,
Wherein the first carrier and the second carrier are linearly controlled by the upper hall sensor and the lower hall sensor or linearly controlled by the hall sensor. The method according to claim 1,
An upper stopper protruding from one surface of the base to be positioned on both sides of the first carrier and restricting the planar linear movement of the first carrier; And
Further comprising a lower stopper protruding from the other surface of the base so as to be positioned on both sides of the second carrier and restricting the planar linear movement of the second carrier. The method according to claim 1,
Wherein the upper coil and the lower coil are each provided in a pair so as to face each other with respect to the light passage hole,
Wherein the upper magnet and the lower magnet are each provided in a pair at positions corresponding to the upper coil and the lower coil. The method according to claim 1,
Wherein the first carrier and the second carrier comprise:
And a lens barrel including a lens group consisting of at least one lens is mounted.

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