KR102350710B1 - Auto focussing apparatus for zoom lens - Google Patents

Abstract

The automatic focus adjustment device for a zoom lens according to the present invention includes first and second guide rails positioned to be spaced apart from each other, and first and second ball supports provided at respective ends of the first and second guide rails. base frame; a zoom lens carrier having first and second grooved rails disposed to correspond to the first and second guide rails, respectively, and moving linearly in an optical axis direction; a driving unit for linearly moving the zoom lens carrier in the optical axis direction; and a plurality of balls disposed between the first groove part rail and the first guide rail and between the second groove part rail and the second guide rail and from which external departure is prevented by the first and second ball support parts. characterized.

Description

Auto-focusing device for zoom lenses

The present invention relates to an automatic focus adjustment apparatus, and more particularly, to an automatic focus adjustment apparatus for a zoom lens to which a structure for realizing a low-power environment and improving the precision of linear movement is applied.

With the development of hardware technology and changes in the user environment, various and complex functions are integratedly implemented in portable terminals (mobile terminals) such as smart phones in addition to basic functions for communication.

A typical example is a camera module that implements functions such as auto focus (AF) and optical image stabilization (OIS). Recently, voice recognition, fingerprint recognition, iris recognition for authentication or security, etc. Functions and the like are also installed in portable terminals. Also, recent attempts have been made to mount a zoom lens in which a plurality of lens groups are aggregated so that the focal length can be varied and variably adjusted.

In the case of a zoom lens, unlike a general lens, since a plurality of lenses or lens groups are coaxially arranged in the optical axis direction, which is the direction in which light is introduced, the length thereof is considerably extended in the optical axis direction than a general lens.

The light of the subject passing through the zoom lens flows into an image pickup device such as a CCD (Charged-coupled Device) or CMOS (Complementary Metal-oxide Semiconductor) like other lenses, and then is generated as image data through subsequent processing.

When the zoom lens is installed in the direction perpendicular to the main board of the mobile terminal, like other general lenses, a space equal to the height of the zoom lens (length in the optical axis direction) is secured in the mobile terminal. Therefore, there is a problem in that it is difficult to optimize for the essential characteristics of device compactness and weight reduction that portable terminals are aiming for.

Conventionally, to solve this problem, there is a method of reducing the size of the optical system itself by adjusting the angle, size, spacing, focal length, etc. of the lens, but this method is a method of physically reducing the size of a zoom lens or a zoom lens barrel. There is an intrinsic limitation, and of course, there is a problem in that the essential characteristics of the zoom lens may be deteriorated.

In addition, when the auto focus function (AF, Auto Focus) is implemented, the linear movement of the barrel or carrier (frame) mounted with the zoom lens is not made precisely as the length of the zoom lens in the optical axis direction becomes longer and its own weight becomes heavier. There may be a problem in that the performance of the auto-focus function itself is deteriorated due to the occurrence of a defect.

In addition, there is also disclosed a structure in which the linear movement of the carrier mounted with the zoom lens in the optical axis direction is supported by the ball. As the length of the carrier increases, the carrier must be supported by more or less balls. , there is a problem in that the driving force for linearly moving the carrier increases because it is structured to move together.

The present invention was devised to solve the above-mentioned problems in the background as described above, and it is possible to optimize the auto-focus function of the zoom lens by linearly moving the zoom lens carrier on which the zoom lens is mounted without tilting and with low power. Its purpose is to provide

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.

According to an aspect of the present invention, there is provided an automatic focus adjustment device for a zoom lens for a zoom lens of the present invention, first and second guide rails positioned to be spaced apart from each other, and first and second guide rails provided at respective ends of the first and second guide rails. a base frame including a ball support; a zoom lens carrier having first and second grooved rails disposed to correspond to the first and second guide rails, respectively, and moving linearly in an optical axis direction; a driving unit for linearly moving the zoom lens carrier in the optical axis direction; and a plurality of balls disposed between the first groove part rail and the first guide rail and between the second groove part rail and the second guide rail, and from which external departure is prevented by the first and second ball support parts. can be

In addition, the first and second grooved rails of the present invention may each be provided with a ball stopper for preventing the ball from moving upward with respect to the optical axis direction, and the first and second grooved rails of the present invention It is preferable that at least one of the works is formed in an open form at the lower end with respect to the optical axis direction.

In addition, the first groove portion rail of the present invention includes an upper groove portion rail and a lower groove portion rail that are vertically disposed on the same line with respect to the optical axis direction, wherein the upper groove portion rail is an upper portion with respect to the optical axis direction. The ball stopper is provided at the end, the ball stopper for preventing the ball from being separated is provided at the lower end with respect to the optical axis direction, and the lower grooved rail has the ball stopper at the upper end with respect to the optical axis direction. It may be provided, and the lower end may be formed in an open shape with respect to the optical axis direction.

Preferably, the first ball support part of the present invention is located in a lower direction than the second ball support part with respect to the optical axis direction so that the length of the first groove part rail is the second groove based on the optical axis direction. It may be formed longer than the length of the sub-rail.

In addition, the ball stopper provided on the upper groove portion rail among the first groove portion rails of the present invention may be disposed above the ball stopper provided on the second groove portion rail based on the optical axis direction.

According to another embodiment of the present invention, each of the first and second grooved rails includes an upper grooved rail and a lower grooved rail that are vertically disposed on the same line with respect to the optical axis direction, and the The upper grooved rail is provided with the ball stopper at its upper end with respect to the optical axis direction, and has a ball stopper for preventing the ball from being separated from its lower end with respect to the optical axis direction, and the lower grooved rail has the optical axis The ball stopper may be provided at the upper end with respect to the direction, and the lower end may be opened with respect to the optical axis direction.

In addition, the driving unit of the present invention is a magnet unit disposed on any one of the zoom lens carrier or the base frame; and a driving coil part disposed on the other one of the zoom lens carrier or the base frame where the magnet part is not disposed, and generating an electromagnetic force in the magnet part so as to linearly move the zoom lens carrier in the optical axis direction. .

Preferably, the magnet unit of the present invention may include a plurality of magnets arranged along the optical axis direction, and the driving coil unit may include a plurality of driving coils arranged along the optical axis direction to face the plurality of magnets, respectively. have.

According to an embodiment of the present invention, a structure for bending the optical path is implemented by applying an optical system for changing the path of light to the zoom lens, and through this, the zoom lens is mounted in the width direction, not the thickness direction, based on the portable terminal. By doing so, it is possible to minimize the overall space of the auto-focusing device for the zoom lens, so that the thickness of the portable terminal can be minimized or it can be optimized for small size.

In addition, according to an embodiment of the present invention, by diversifying or distributing a magnet provided in a zoom lens or a zoom lens carrier including a zoom lens and a driving coil corresponding to the magnet, the weight of the zoom lens is more effectively dispersed and supported while sufficient As it can generate driving force, it can ensure the precision of linear movement during auto-focus driving, and has the effect of fundamentally preventing tilt defects that occur during auto-focus driving.

The present invention implements the lower side of the first groove rail and the second groove rail provided on both sides of the zoom lens carrier in an open form, so that when the zoom lens carrier moves upward in the optical axis direction, the first groove rail and the second groove rail It is possible to reduce the phenomenon in which the ball disposed on the second groove rail is dragged and moved by the zoom lens carrier, thereby reducing noise as well as minimizing the driving force for linear movement of the zoom lens carrier.

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 perspective view showing an automatic focus adjustment device for a zoom lens according to an embodiment of the present invention;
Figure 2 is an exploded perspective view showing the auto focus adjustment device for a zoom lens according to an embodiment of the present invention,
3 is a view showing the automatic focus adjustment device for a zoom lens according to an embodiment of the present invention by disassembling the yoke and the circuit board from the base frame;
4 is a view for explaining the coupling structure of the base frame and the zoom lens carrier of the automatic focus adjustment device for a zoom lens according to an embodiment of the present invention;
5 is a cross-sectional view showing a part of the base frame of the automatic focus adjustment device for a zoom lens according to an embodiment of the present invention;
6 is an exploded perspective view showing an automatic focus adjustment device for a zoom lens according to another embodiment of the present invention;
7 is a view for explaining a coupling structure of a base frame and a zoom lens carrier of an automatic focus adjustment device for a zoom lens according to another embodiment of the present invention;
8 is a cross-sectional view showing a part of the base frame of the automatic focus adjustment device for a zoom lens 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 to 5, the automatic focus adjustment apparatus 100 for a zoom lens according to an embodiment of the present invention (hereinafter referred to as 'autofocus adjustment apparatus') includes a base frame 110, a base frame 110 ), a zoom lens carrier 130 coupled to be movable linearly, a plurality of balls 150 disposed between the base frame 110 and the zoom lens carrier 130, and a driving unit 160 for moving the zoom lens carrier 130 in advance. may include

The plurality of balls 150 reduce friction between the zoom lens carrier 130 and the base frame 110 when the zoom lens carrier 130 moves relative to the base frame 110, and the zoom lens carrier 130 smoothly moves linearly. induce you to

As shown in FIG. 1 , the auto-focus control device 100 of the present invention has an optical axis direction, which is a path L of light that is refracted or reflected through an optical system 300 (mirror, prism, etc.) and flows into the zoom lens 400 . It is configured to linearly move the zoom lens 400 in the (Z-axis direction).

The optical system 300 may be one selected from a mirror or a prism, or a combination thereof, and is implemented with various members that can convert light entering from the outside to the automatic focus adjustment device 100 of the present invention. can be

As described above, the automatic focus adjusting apparatus 100 according to the present invention is configured to adjust the focus of the zoom lens 400 by linearly moving the zoom lens 400 in the optical axis direction of the light whose optical path is refracted by the optical system 300 , It does not need to be installed in the thickness direction of the terminal. Therefore, even if mounted on the portable terminal, the thickness of the portable terminal is not increased, and thus the portable terminal can be optimized for miniaturization.

The zoom lens 400 may be composed of a plurality of lenses or lens groups or optical members such as prisms and mirrors. In addition, the zoom lens 400 may have a shape extending in the optical axis direction (Z axis direction) of the light traveling through the optical system 300 .

In the description of the present invention, the side through which the light passing through the optical system 300 is incident among both ends of the zoom lens 400 is defined as the light incident part Pi, and the side from which the light is emitted is defined as the light output part Po. Also, although not shown in the drawing, an imaging device such as CCD or CMOS for converting an optical signal into an electrical signal may be provided in the path of the light emitted from the light output unit Po of the zoom lens 400 .

The base frame 110 of the present invention is a kind of housing for accommodating the zoom lens carrier 130, and is coupled to the case 120 having an opening 121 through which light can pass, and can be mounted on a mobile terminal or the like.

Openings 111 and 112 are provided on the upper and lower surfaces of the base frame 110 with respect to the optical axis direction, and an opening 113 for installing the driving coil unit 165 on one side of the base frame 110 is provided. is formed Of course, the base frame 110 can be changed to various other structures other than the illustrated structure, which can support the zoom lens carrier 130 to be relatively movable.

A first guide rail 115 and a second guide rail 116 are provided inside the side surface of the base frame 110 on which the opening 113 is formed (refer to FIG. 4), and the first guide rail 115 and the second guide rail 115 are provided. The second guide rail 116 may be formed in a form in which a groove portion in which the ball 150 is partially accommodated is extended.

At the lower (downward direction with respect to the optical axis direction) end of the first guide rail 115 , that is, at the end farther from the light incident part Pi, a first ball support part 117 for preventing the ball 150 from leaving the outside. ) is provided, and a second ball support part 118 is provided at the lower end of the second guide rail 116 to prevent the ball 150 from leaving the outside.

The first ball support part 117 is configured to be positioned lower than the second ball support part 118 with respect to the optical axis direction, so that the length of the first groove part rail 140 is the second groove part based on the optical axis direction. It is desirable to be formed longer than the length of the work (147).

The circuit board 170 and the yoke 180 are coupled to the outside of the side of the base frame 110 on which the first guide rail 115 and the second guide rail 116 are provided. A magnetic field sensor 174 such as a driving coil unit 165 constituting the driving unit 160 , a driving driver 172 for controlling the current applied to the magnet unit 161 , and a Hall sensor is installed on the circuit board 170 . . According to an embodiment, the Hall sensor 174 and the driving driver 172 may be implemented as a single chip.

The yoke 180 generates attractive force to the magnet unit 161 provided in the zoom lens carrier 130 so that the zoom lens carrier 130 to which the magnet unit 161 is coupled is pulled toward the yoke 180 . Due to the attractive force of the yoke 180 , the zoom lens carrier 130 can continuously maintain a constant distance with the side surface of the base frame 110 and the ball 150 interposed therebetween.

As such, the yoke 180 for generating attractive force to the magnet unit 161 is provided in the base frame 110 by insert injection as well as in the form of being coupled to the base frame 110 in an independent configuration, or the base frame itself is It may also be implemented as an integral type to function as a yoke.

The zoom lens carrier 130 of the present invention mounted on the inside of the base frame 110 and moving linearly in the optical axis direction includes a zoom lens barrel 131 having a zoom lens insertion hole 132 to which the zoom lens 400 is coupled, a zoom lens barrel ( 131) and may include a carrier body 135 coupled to the base frame 110 to be linearly movable.

The zoom lens barrel 131 may be coupled to the carrier body 135 so as to be relatively movable in a direction perpendicular to the optical axis direction according to an embodiment.

Through holes 137 and 138 are respectively formed on the upper and lower surfaces of the carrier body 135 in the optical axis direction, and both ends of the zoom lens barrel 131 can be exposed to the outside through the through holes 137 and 138. have. It goes without saying that the zoom lens barrel 131 and the carrier body 135 may have an integrated structure rather than a separate structure as illustrated in the drawings.

A first groove rail 140 and a second groove rail 147 are provided on one outer surface of the carrier body 135 to be spaced apart from each other in parallel to the optical axis direction of the zoom lens 400 .

As shown in the drawings, the lower end of each of the first and second grooved rails 140 and 147 of the present invention is opened toward the end of the carrier body 135 with respect to the optical axis direction. is done

These first grooved rails 140 and second grooved rails 147 are disposed to face the first and second guide rails 115 and 116 of the base frame 110, respectively, and the first groove A plurality of balls 150 are disposed between the sub rail 140 and the first guide rail 115 and between the second groove sub rail 147 and the second guide rail 116, so that the carrier body 135 is It can move smoothly linearly with respect to the base frame 110 .

The ball 150 disposed on each of the first groove part rail 140 and the second groove part rail 147 is limited in movement in a direction perpendicular to the optical axis direction (X-axis direction), and the first groove part rail ( 140) and the second grooved rail 147, respectively, a rolling motion or a translational motion in the optical axis direction (moving) is performed.

According to the embodiment, only one of the first guide rail 115 and the first groove part rail 140 facing each other with the ball 150 interposed therebetween is formed in the form of a groove into which the ball 150 is partially inserted, and the other One may be formed in a flat shape. From a corresponding point of view, only one of the second guide rail 116 and the second groove part rail 147 facing each other may be formed in a groove shape.

The first grooved rail 140 has a shape including an upper grooved rail 141 and a lower grooved rail 142 that are vertically disposed on the same line with respect to the optical axis direction, that is, the grooved rail is dualized. It is preferred to be implemented.

A ball 150 is disposed on each of the upper grooved rail 141 and the lower grooved rail 142 , and a ball stopper 143 is disposed at the upper (upward direction based on the optical axis direction) end of the upper grooved rail 141 . ) is provided, and a ball locking jaw 144 is provided at the lower (downward direction based on the optical axis direction) end.

The ball stopper 143 and the ball stopper 144 prevent the ball 150 disposed on the upper groove portion rail 141 at the upper and lower ends of the upper groove portion rail 141 from escaping to the outside. That is, the ball stopper 143 prevents the ball 150 from moving in the upper direction with respect to the optical axis direction, and the ball stopper 144 prevents the ball 150 from moving in the lower direction.

As shown, an auxiliary ball 155 having a smaller diameter than the ball 150 may be disposed on the upper groove part rail 141 together with the ball 150 . The auxiliary ball 155 is interposed between the ball 150 and the ball engaging projection 144 to space the ball 150 from the ball engaging projection 144, and the like.

Through such a structure, the movement of the ball 150 disposed on the upper recessed rail 141 toward the lower recessed rail 142 is restricted, and the ball 150 disposed on the lower recessed rail 142 is moved upward. By restricting movement to the grooved rail 141 side, when the zoom lens carrier 130 linearly moves with respect to the base frame 110 , the ball 150 of the upper grooved rail 141 and the lower grooved rail 142 . The ball 150 can move while maintaining a separation distance of a certain size or more, so that the physical support of the zoom lens carrier 130 can be made more effectively.

In addition, the lower grooved rail 142 is provided with a ball stopper 145 for preventing the ball 150 from being separated at its upper end, but as shown in FIG. 4 , the lower end of the lower grooved rail 142 is It is preferable to be implemented in an open form, and as shown in FIG. 4 , the lower end of the second grooved rail 147 (downward in the optical axis direction) also preferably forms an open shape.

As described above, when the zoom lens carrier 130 moves in the optical axis direction through the structure in which the lower portions of the lower groove rail 142 and the second groove rail 147 of the first groove portion rail 140 are opened, the lower groove portion The movement of the balls 150 located on the first 142 and the second groove rail 147 can be minimized, so that the driving force that moves the zoom lens carrier 130, that is, the electric power applied to the driving coil unit 165, is reduced. It can be improved to a low-power environment.

In order to effectively support the zoom lens carrier 130 , the second grooved rail 147 is longer than the upper grooved rail 141 or the lower grooved rail 142 of the first grooved rail 140 . desirable.

As shown in the figure, two balls 150 and one auxiliary ball 155 are disposed on each of the first groove portion rail 140 and the second groove portion rail 147 . In this case, the auxiliary ball 155 may be interposed between the two balls 150 in the second groove part rail 147 .

Balls disposed on the second grooved rail 147 such that one ball 150 is distributed to the upper grooved rail 141 and the lower grooved rail 142 in the first grooved rail 140 , respectively. In relation to (150), it is preferable to configure the zoom lens carrier 130 to be supported in three parts as a whole.

2 to 4, the driving unit 160 of the present invention is a magnet unit 161 disposed on any one of the zoom lens carrier 130 or the base frame 110, the zoom lens carrier 130 or the base frame ( 110) and a driving coil unit 165 disposed in the other one of which the magnet unit 161 is not disposed.

Hereinafter, as illustrated in the drawings, it will be described based on an example in which the magnet unit 161 is disposed on the zoom lens carrier 130 which is a movable body and the driving coil unit 165 is disposed on the base frame 110 which is a relatively fixed body.

The magnet unit 161 may include a plurality of magnets 162 and 163 disposed along the optical axis direction. The magnets 162 and 163 may be implemented in various numbers as long as the driving force for the zoom lens carrier 130 can be dispersed. In the following description, the plurality of magnets 162 and 163 will be exemplified as a first magnet 162 and a second magnet 163 in order to improve understanding and convenience of explanation.

The driving coil unit 165 includes a plurality of driving coils 166 and 167 disposed along the optical axis to face the plurality of magnets 162 and 163 , respectively. The driving coils 166 and 167 are disposed along the optical axis direction to face the magnets 162 and 163 and are provided at positions corresponding to the magnets 162 and 163 .

The driving coils 166 and 167 may also be implemented in various numbers as long as the driving force for the zoom lens carrier 130 can be distributed like the magnets 162 and 163 . In the following description, based on the example shown in the drawings, the plurality of driving coils 166 and 167 will be exemplified as a first driving coil 166 and a second driving coil 167 .

When power is applied from the outside through the circuit board 170, the first driving coil 166 and the second driving coil 167 generate an electromagnetic force corresponding to the magnitude and direction of the applied power, and are produced by the generated electromagnetic force. A driving force is generated in each of the first magnet 162 and the second magnet 163 . When the driving force is generated in this way, the zoom lens carrier 130 having the first magnet 162 and the second magnet 163 is linearly moved up and down with respect to the optical axis direction.

In this regard, the magnetic field sensor 174, such as a Hall sensor using the Hall effect, detects the positions of the magnets 162 and 163 (that is, the position of the zoom lens carrier 130) to generate a specific detection signal. When transferred to 172 , the driving driver 172 may control power of an appropriate magnitude and direction to be applied to each driving coil 166 and 167 using the input signal of the magnetic field sensor 174 .

Through this method, the automatic focus adjustment function can be precisely implemented by feedback-controlling the precise position of the zoom lens carrier 130 with respect to the optical axis direction. The driving driver 172 may be implemented in a form independent of the magnetic field sensor 174 , or may be implemented in the form of a single module with the magnetic field sensor 174 .

As described above, the zoom lens barrel 131 of the zoom lens carrier 130 has a shape that is elongated in the optical axis direction. In the case of disposing the driving coil of , when the zoom lens barrel 131 moves linearly, a slight tilt phenomenon, that is, a tilt phenomenon due to posture imbalance, may occur in the upward or downward direction of the zoom lens barrel 131 depending on the linear movement direction.

Since a plurality of lenses are provided inside the zoom lens barrel 131 and the entire length of the zoom lens barrel 131 itself is long, even if the tilt phenomenon is minute, the effect on the image pickup device is significant.

According to the present invention, the magnets 162, 163 and the driving coils 166 and 167 are diversified and arranged in the vertical direction, and the first and second sides respectively on the upper side and the lower side based on the central portion of the zoom lens barrel 131 in the vertical longitudinal direction. By disposing the magnet 162 and the second magnet 163 and causing an electromagnetic force to be generated between each of them and the first driving coil 166 and the second driving coil 167, the load is relatively heavy in the zoom lens barrel ( 131), while increasing the driving force of the vertical linear movement, it is possible to effectively prevent the tilt phenomenon occurring on the upper side or the lower side depending on the direction of the linear movement.

The driving unit 160 is not limited to the illustrated one, and may be implemented in various forms including physical driving means such as a piezoelectric element and a motor.

Hereinafter, an operation relationship in which the zoom lens carrier 130 linearly moves in the optical axis direction through the media of the ball 150 and a detailed configuration for this will be described with reference to FIGS. 4 and 5 .

As shown, the zoom lens carrier 130 has a first guide rail 115 and a second guide rail 116 on an outer surface on which the first groove rail 140 and the second groove rail 147 are provided. It is coupled to the base frame 110 so as to face the inner surface of the base frame 110 .

The ball 150 is disposed between the first grooved rail 140 and the first guide rail 115 and between the second grooved rail 147 and the second guide rail 116 facing each other. The outer surface of the zoom lens carrier 130 is pulled toward the inner surface of the base frame 110 by the attractive action of the magnet unit 161 by the yoke 180, and the zoom lens carrier 130 and the base frame 110 are respectively ball ( 150) is in point contact.

In this state, when current is applied to the driving coil unit 165 , the zoom lens carrier 130 receives a moving force in the optical axis direction due to electromagnetic interaction between the magnet unit 161 and the driving coil unit 165 . The zoom lens carrier 130 linearly moves with the frictional force minimized by the rolling motion of 150 and the point contact. Accordingly, it is possible to reduce noise as well as minimize the driving force for linear movement of the zoom lens carrier 130 .

As briefly described above, the zoom lens carrier 130 may continuously maintain point contact with the ball 150 by the attractive force between the yoke 180 and the magnet unit 161 . Accordingly, the zoom lens carrier 130 is not separated, and it is possible to linearly move while maintaining an accurate separation distance corresponding to the diameter of the ball 150 with the base frame 110 .

In addition, when the zoom lens carrier 130 moves relative to the base frame 110 , some of the plurality of balls 150 disposed between the zoom lens carrier 130 and the base frame 110 may be separated from the first guide rail 115 and Guided along the first groove rail 140 in the optical axis direction, the other part of the ball 150 is guided in the optical axis direction along the second guide rail 116 and the second groove rail 147, so that the zoom lens carrier 130 can more accurately move linearly in the optical axis direction.

On the other hand, when the zoom lens carrier 130 moves upward with respect to the optical axis direction, the ball 150 disposed on the upper groove rail 141 in order to effectively maintain the physical support in the upper direction of the zoom lens carrier 130 is a ball Instead of moving upward by the locking jaw 144, the lower grooved rail 142 or the second grooved rail 147 is implemented in an open form at the lower end of the lower grooved rail 142 or the second The ball 150 located on the groove rail 147 is configured not to be dragged and moved.

6 is an exploded perspective view showing an automatic focus control device according to another embodiment of the present invention.

The automatic focus adjustment device 200 shown in FIG. 6 is disposed between the base frame 210 , the zoom lens carrier 220 coupled to the base frame 210 to be movably linear, and the base frame 210 and the zoom lens carrier 220 . It includes a plurality of balls 150 and a driving unit 160 for moving the zoom lens carrier 220 in advance.

The automatic focus adjustment apparatus 200 of the present invention shown in FIG. 6 is a modified part of the base frame 210 and the zoom lens carrier 220 compared to the automatic focus adjustment apparatus 100 described above. is the same as described above.

A first guide rail 215 and a second guide rail 216 are provided inside one side of the base frame 210 .

At the lower end of the first guide rail 215 , a first ball receiving part 217 for preventing the ball 150 from coming out is provided, and also at the lower end of the second guide rail 216 in the optical axis direction. A second ball support part 218 is provided to prevent the ball 150 from leaving the outside.

The first ball support part 217 and the second ball support part 218 may be located at the same height, and the lengths of the first guide rail 215 and the second guide rail 216 may also be configured to correspond to each other. can

The zoom lens carrier 220 includes a zoom lens barrel 131 to which the zoom lens 400 is coupled, and a carrier body 222 coupled to the zoom lens barrel 131 to be linearly movably coupled to the base frame 210 . The zoom lens barrel 131 is the same as described above.

A first groove rail 223 and a second groove rail 230 are provided on one outer surface of the carrier body 222 to be spaced apart from each other in parallel to the optical axis direction of the zoom lens 400 .

The first grooved rail 223 and the second grooved rail 230 have a lower end of each of which is opened toward the end of the carrier body 222 with respect to the optical axis direction. The first and second grooved rails 223 and 230 are disposed to face the first and second guide rails 215 and 216 of the base frame 210 , respectively.

The first grooved rail 223 and the second grooved rail 230 are upper and lower grooved rails 224 and 231 and lower grooved rails 225, which are disposed vertically on the same line with respect to the optical axis direction, respectively. 232) may be included.

Ball stoppers 226 and 233 are provided at the upper (upward direction based on the optical axis direction) end of each of the upper groove rails 224 and 231, and ball stoppers 227 and 234 are provided at the lower end. do. An auxiliary ball 155 having a smaller diameter than the ball 150 may be disposed on each of the upper groove rails 224 and 231 together with the ball 150 .

A ball stopper 228, 235 for preventing the ball 150 from being separated is provided at the upper end of each lower grooved rail 225, 232, and as described above, each of the lower grooved rails 225 and 232 ( 232) has an open lower end.

In this way, the ball 150 disposed on each of the upper grooved rails 224 and 231 is restricted from moving toward each of the lower grooved rails 225 and 232 , and each of the lower grooved rails 225 and 232 is limited. ) by limiting the movement of the balls 150 disposed on the upper grooved rails 224 and 231 side, the first grooved rail 223 when the zoom lens carrier 220 linearly moves with respect to the base frame 210 . ) and the balls 150 disposed on each of the second grooved rails 230 may maintain a separation distance of a predetermined distance or more.

In particular, the balls 150 respectively disposed on the first grooved rail 223 and the second grooved rail 230 are disposed on the upper grooved rails 224 and 231 and the lower grooved rails 225 and 232 . Since one or more of each may be disposed to maintain an interval of a predetermined size or more, the zoom lens carrier 220 may more stably maintain a balance.

On the other hand, when the zoom lens carrier 220 moves upward in the optical axis direction, each of the lower grooved rails 225 and 232 has an open lower end, so that the lower grooved rails 225 and 232 are formed. It is possible to suppress the movement of the ball 150 located in the zoom lens carrier 220 together with the reduction of noise, as well as to minimize the driving force for the linear movement of the zoom lens carrier (220).

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 addition, in the description of the present invention, expressions such as first, second, or upper, lower, etc. are merely terms of a tool concept used to relatively distinguish each component (element) from each other, and a specific order, priority, etc. It is self-evident that it is not a term used to indicate , or a term used to physically distinguish each component (element) in an absolute standard.

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 apparent that various types of modification application examples are possible at the level of those skilled in the art in consideration of this.

100, 200: Auto-focusing device for zoom lens
110, 210: base frame 115, 215: first guide rail
116, 216: second guide rail 117, 217: first ball support part
118, 218: second ball support 120: case
130, 220: zoom lens carrier 131: zoom lens barrel
135, 222: carrier body 140, 223: first groove rail
141, 224, 231: upper groove rail 142, 225, 232: lower groove rail
143, 145, 148, 226, 228, 233, 235: ball stopper
144, 227, 234: ball catch jaw 147, 230: 2nd groove rail
150: ball 155: auxiliary ball
160: driving unit 161: magnet unit
162, 163: first and second magnets 165: driving coil unit
166, 167: first and second driving coil 170: circuit board
172: drive driver 174: magnetic field sensor
180: York

Claims (9)

a base frame including first and second guide rails spaced apart from each other, and first and second ball support portions provided at respective ends of the first and second guide rails;
a zoom lens carrier having first and second grooved rails disposed to correspond to the first and second guide rails, respectively, and moving linearly in an optical axis direction;
a driving unit for linearly moving the zoom lens carrier in the optical axis direction; and
a plurality of balls disposed between the first groove part rail and the first guide rail and between the second groove part rail and the second guide rail, and from which external departure is prevented by the first and second ball support parts;
Each of the first and second groove part rails is provided with a ball stopper for preventing the ball from moving upward with respect to the optical axis direction,
The first groove portion rail includes an upper groove portion rail and a lower groove portion rail disposed vertically on the same line with respect to the optical axis direction,
The upper grooved rail is provided with the ball stopper at its upper end with respect to the optical axis direction, and has a ball stopper for preventing the ball from being separated from its lower end with respect to the optical axis direction, and the lower grooved rail is The automatic focus adjusting device for a zoom lens, characterized in that the ball stopper is provided at the upper end with respect to the optical axis direction, and the lower end is opened with respect to the optical axis direction. delete The method of claim 1, wherein at least one of the first and second grooved rails,
An automatic focus adjusting device for a zoom lens, characterized in that the lower end is opened in the optical axis direction. delete a base frame including first and second guide rails spaced apart from each other, and first and second ball support portions provided at respective ends of the first and second guide rails;
a zoom lens carrier having first and second grooved rails disposed to correspond to the first and second guide rails, respectively, and moving linearly in an optical axis direction;
a driving unit for linearly moving the zoom lens carrier in the optical axis direction; and
a plurality of balls disposed between the first groove part rail and the first guide rail and between the second groove part rail and the second guide rail, and from which external departure is prevented by the first and second ball support parts;
The first ball support part is located in a lower direction than the second ball support part with respect to the optical axis direction, so that the length of the first groove part rail is longer than the length of the second groove part rail based on the optical axis direction. Automatic focus control device for zoom lenses, characterized in that. According to claim 1, wherein the ball stopper provided on the upper groove portion rail of the first groove portion rail,
Auto-focus adjustment device for a zoom lens, characterized in that it is disposed above a ball stopper provided in the second groove part rail with respect to the optical axis direction. a base frame including first and second guide rails spaced apart from each other, and first and second ball support portions provided at respective ends of the first and second guide rails;
a zoom lens carrier having first and second grooved rails disposed to correspond to the first and second guide rails, respectively, and moving linearly in an optical axis direction;
a driving unit for linearly moving the zoom lens carrier in the optical axis direction; and
a plurality of balls disposed between the first groove part rail and the first guide rail and between the second groove part rail and the second guide rail, and from which external departure is prevented by the first and second ball support parts;
Each of the first and second groove part rails is provided with a ball stopper for preventing the ball from moving upward with respect to the optical axis direction,
Each of the first and second groove portion rails includes an upper groove portion rail and a lower groove portion rail disposed vertically on the same line with respect to the optical axis direction,
The upper groove part rail is provided with the ball stopper at the upper end with respect to the optical axis direction, and the lower end with a ball stopper for preventing the ball from being separated in the optical axis direction,
The lower groove part rail is provided with the ball stopper at an upper end in the optical axis direction, and has an open lower end in the optical axis direction. According to claim 1, wherein the driving unit,
a magnet part disposed on either the zoom lens carrier or the base frame; and
and a driving coil part disposed on the other one of the zoom lens carrier or the base frame where the magnet part is not disposed, and generating an electromagnetic force in the magnet part so as to linearly move the zoom lens carrier in the optical axis direction. Autofocus control device for zoom lenses. The method of claim 8, wherein the magnet unit,
and a plurality of magnets disposed along the optical axis direction, and wherein the driving coil unit includes a plurality of driving coils disposed along the optical axis direction to face the plurality of magnets, respectively. .

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