KR100926686B1 - Small camera - Google Patents

Abstract

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problem, and an object thereof is to provide a compact camera device that can be easily applied to a product by specifying a structure for fixing a nonmagnetic conductor to a coil side.

The compact camera device of the present invention includes a lens holder mounted with a lens and driven in an optical axis direction; A fixing part incorporating the lens holder; A leaf spring disposed above or below the lens holder to support and connect the lens holder to the fixing unit so that the lens holder flows in the optical axis direction; A magnet fixed to the fixing part in the lens holder direction; A coil surrounding the lens holder to be exposed to the magnetic field of the magnet; It consists of a non-magnetic conductor surrounding the lens holder in parallel with the coil so as to be exposed to the magnetic field of the magnet, the upper seating protrusion protrudes in the outer peripheral surface direction on the upper portion of the lens holder, the outer peripheral surface direction on the lower portion of the lens holder The lower seating protrusion protrudes, and the coil and the nonmagnetic conductor are mounted to surround the lens holder between the upper seating protrusion and the lower seating protrusion.

Small camera device, lens holder, non-magnetic conductor,

Description

Miniature Camera Unit {IMAGE PHOTOGRAPHING DEVICE}

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a compact camera device, and in particular, a magnet is disposed in a fixed portion, a nonmagnetic conductor is coupled to a lens holder located in a magnetic field region of the magnet, and the lens holder is damped by a eddy current damping force. The present invention relates to a compact camera device for shortening the time for photographing an image by quickly stabilizing a lens holder during movement.

A small communication device such as a mobile phone is equipped with a small camera device.

6 is a cross-sectional structural view of a conventional small camera device of the VCM method, Figure 7 is a cross-sectional structural view of the state of use of the small camera device shown in Figure 6, Figure 8 is a correlation between the vibration of the lens portion shown in Figure 6 and time A graph showing the relationship.

The compact camera device shown in this figure includes a lens group 500 made up of a plurality of lenses for converting the magnification of a subject, a lens holder 550 for mounting the lens group 500 to drive in the optical axis direction; And a leaf spring supported by the fixing part 600 and the fixing part 600 to lift the lens holder 550 to be movable in the optical axis direction and to guide the lens holder 550 to be driven exactly in the optical axis direction. 650, an actuator supported by the lens holder 550 to drive the fixing part 600 in the optical axis direction, an image sensor 800 for capturing an image of a subject passing through the lens group 500, It consists of a control unit for controlling the actuator and the image sensor (800).

The leaf spring 650 has a shape in which the width of the leaf spring 650 is narrowed between the portion fixed to the fixing part 600 and the portion fixed to the lens holder 550 to facilitate deformation in the optical axis direction.

Therefore, the leaf spring 650 elastically supports the lens holder 550 to flow in the optical axis direction.

In addition, the leaf spring 650 is fixed to at least four locations of the lens holder 550, and serves as a guide for preventing the lens holder 560 from flowing in a direction orthogonal to the optical axis direction.

On the other hand, the actuator, the magnet 710 is fixed to the fixing part 600, and the lens holder 550 is fixed to the lens holder 550 receives the magnetic flux from the magnet 710 when the power is supplied from the control unit in the optical axis direction It consists of a coil 720 for generating a driving force.

The structure of such an actuator is called a VCM method.

One pair of magnets 710 and one coil 720 are provided at symmetrical portions.

The actuator also has a yoke 730 for circulating the magnetic flux of the magnet 710 efficiently.

As shown in FIG. 7, when the compact camera device having the above configuration is applied to the coil 720 of the actuator from the control unit, an electromagnetic force for moving the coil 720 in the optical axis direction under the influence of the magnetic flux emitted from the magnet 710. This happens.

Therefore, the fixing part 600 to which the coil 720 is fixed moves in the optical axis direction.

In this way, the controller raises or lowers the lens group 500 in the optical axis direction so that the image captured by the image sensor 800 becomes clear.

Meanwhile, FIG. 8 is a graph showing the correlation between the vibration of the lens unit and time when the lens unit including the lens group 500 and the lens holder 550 moves as shown in FIG. 7 by applying a step voltage to the coil 720. to be.

Although the driving voltage applied to the coil 720 is constant, it can be seen that the vibration converges to a desired height while vibrating badly.

If the image is picked up while the vibration is occurring, the image is noisy. Therefore, the image should be picked up after the vibration is stopped.

Therefore, a method for minimizing the time that vibration occurs is needed.

In order to solve this problem, the present applicant has applied for a small camera device having a nonmagnetic conductor as a component fixed to the coil side to generate eddy current damping force so as to be exposed to the magnetic field of the magnet. Patent Publication No. 10-0676679).

Patent No. 10-0676679 discloses that a nonmagnetic conductor is fixed to a coil side, which is not specifically described in the fixed coupling structure.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problem, and an object thereof is to provide a compact camera device that can be easily applied to a product by specifying a structure for fixing a nonmagnetic conductor to a coil side.

In order to achieve the above object, the compact camera device of the present invention comprises: a lens holder mounted with a lens and driven in an optical axis direction; A fixing part incorporating the lens holder; A leaf spring disposed above or below the lens holder to support and connect the lens holder to the fixing unit so that the lens holder flows in the optical axis direction; A magnet fixed to the fixing part in the lens holder direction; A coil surrounding the lens holder to be exposed to the magnetic field of the magnet; It consists of a non-magnetic conductor surrounding the lens holder in parallel with the coil so as to be exposed to the magnetic field of the magnet, the upper seating protrusion protrudes in the outer peripheral surface direction on the upper portion of the lens holder, the outer peripheral surface direction on the lower portion of the lens holder The lower seating protrusion protrudes, and the coil and the nonmagnetic conductor are mounted to surround the lens holder between the upper seating protrusion and the lower seating protrusion.

The protruding length of the upper seating protrusion and the lower seating protrusion is larger than the combined thickness of the coil and the nonmagnetic conductor.

A central seating protrusion protrudes from the center portion of the lens holder in an outer circumferential direction, and the coil includes: an upper coil disposed between the upper seating protrusion and the middle seating protrusion; The lower coil is disposed between the middle seating protrusion and the lower seating protrusion.

The protruding length of the middle seating protrusion is greater than the combined thickness of the coil and the nonmagnetic conductor, and the nonmagnetic conductor includes: an upper nonmagnetic conductor covering the upper coil; It consists of a lower nonmagnetic conductor covering the lower coil.

Alternatively, the protruding length of the middle seating protrusion is smaller than the protrusion lengths of the upper seating protrusion and the lower seating protrusion and greater than the thickness of the coil, wherein the nonmagnetic conductor is between the upper coil and the middle seating protrusion. Cover both seating protrusions and lower coils.

According to the compact camera device of the present invention as described above has the following advantages.

Production is easy by specifying the structure for fixing the non-magnetic conductor to the lens holder.

In addition, it is possible to prevent the nonmagnetic conductor from slipping off the upper or lower portion of the lens holder by the upper seating protrusion and the lower seating protrusion.

In addition, by placing the upper coil and the lower coil, respectively, on the upper portion of the middle seating projection, it is possible to prevent the upper coil and the lower coil from contacting in advance.

First embodiment

1 is a perspective view illustrating a coupling structure of a lens holder and a nonmagnetic conductor according to a first embodiment of the present invention, FIG. 2 is a cross-sectional view of a compact camera device according to a first embodiment of the present invention, and FIG. It is a view for explaining the damping principle of a small camera device according to the present invention.

1 and 2, the compact camera device of the present invention, a lens (not shown), a lens holder 55, a fixing part 60, a leaf spring 65, a magnet 71, a coil ( 72), the nonmagnetic conductor 75, the image sensor 80, the control unit and the like.

The lens is for converting the magnification of the subject and consists of a plurality of lenses.

The lens holder 55 is mounted in the lens and is driven in the optical axis direction.

The fixing part 60 is the same as the outer case of the small camera device. The fixing part 60 includes other components including the lens holder 55.

The leaf spring 65 is disposed above and / or below the lens holder 55 to connect the lens holder 55 to the fixing part 60 so that the lens holder 55 flows in the optical axis direction. To support it.

The magnet 71 is fixedly coupled to the fixing part 60 in the direction of the lens holder 55 from the outside of the lens holder 55.

At this time, the magnet 71 is disposed differently in the vertical direction.

The coil 72 surrounds the lens holder 55 to be exposed to the magnetic field of the magnet 71.

The coil 72 receives a magnetic flux of the magnet 71 when a current is applied to generate a force for driving the lens holder 55 in the optical axis direction.

The nonmagnetic conductor 75 surrounds the lens holder 55 in parallel with the coil 72 so as to be exposed to the magnetic field of the magnet 71.

The nonmagnetic conductor 75 is fixedly coupled to the lens holder 55 to generate a eddy current damping force.

When the nonmagnetic conductor 75 moves at a constant speed in a region where a magnetic field is uniformly distributed, a force proportional to the speed is generated in a direction opposite to the moving direction, which is called a eddy current damping force.

In this embodiment, the vibration generated when the lens holder 55 is driven by the eddy current damping force generated by the nonmagnetic conductor 75 is quickly damped.

The image sensor 80 serves to capture an image of the subject passing through the lens.

The controller controls the coil 72 and the image sensor 80.

The coil 72 receives the magnetic force of the magnet 71 when the power is supplied from the controller to generate an electromagnetic force according to Fleming's left hand law to drive the lens holder 55 in the optical axis direction.

Among the above-described components, the lens, the fixing part 60, the leaf spring 65, the magnet 71, the image sensor 80, and the like are the same as in the prior art, and thus the detailed description thereof will be omitted.

The lens holder 55 has a hollow cylindrical shape, the upper seating protrusion 56 protrudes in the outer circumferential direction on the upper side, the lower seating protrusion 57 protrudes in the outer circumferential direction on the lower side, and the outer circumferential surface in the center portion. The central seating protrusion 58 protrudes.

The upper seating protrusion 56, the lower seating protrusion 57, and the middle seating protrusion 58 are formed in parallel in the protruding direction, respectively.

At this time, the protruding lengths of the upper seating protrusion 56, the lower seating protrusion 57 and the middle seating protrusion 58 are preferably the same.

The coil 72 and the nonmagnetic conductor 75 are mounted to surround the lens holder 55 between the upper seating protrusion 56 and the lower seating protrusion 57.

In this case, the coil 72 may be disposed between the upper coil 72a disposed between the upper seating protrusion 56 and the middle seating protrusion 58, and between the middle seating protrusion 58 and the lower seating protrusion 57. The lower coil 72b is disposed.

By dividing the upper coil 72a and the lower coil 72b into upper and lower portions by the middle seating protrusion 58, it is possible to prevent the upper coil 72a and the lower coil 72b from mutually contacting each other. .

The nonmagnetic conductor 75 includes an upper nonmagnetic conductor 75a covering the upper coil 72a and a lower nonmagnetic conductor 75b covering the lower coil 72b.

Accordingly, the upper coil 72a and the upper nonmagnetic conductor 75a are disposed between the upper seating protrusion 56 and the middle seating protrusion 58, and the lower coil 72b and the lower nonmagnetic conductor 75b. ) Is disposed between the middle seating protrusion 58 and the lower seating protrusion 57.

At this time, the protruding length of each of the upper seating protrusion 56, the lower seating protrusion 57, and the middle seating protrusion 58 is equal to or greater than the sum of the thickness of the coil 72 and the nonmagnetic conductor 75, that is, the laminated thickness. Make it big.

As described above, the protruding lengths of the upper seating protrusions 56, the lower seating protrusions 57, and the middle seating protrusions 58 are larger than the sum of the thicknesses of the coils 72 and the nonmagnetic conductor 75. The 72 and the nonmagnetic conductor 75 can be prevented from flowing in the vertical direction or separated from the lens holder 55.

In the laminated structure of the nonmagnetic conductor 75 and the coil 72, the nonmagnetic conductor 75 may be first wound on the lens holder 55 and the coil 72 may be wound thereon. The coil 72 was first wound on the lens holder 55, and the nonmagnetic conductor 75 was wound on the lens holder 55 and laminated.

The nonmagnetic conductor 75 may surround the entire lens holder 55, or may be mounted on the lens holder 55 only on a surface of the non-magnetic conductor 75 that faces the magnet 71.

The nonmagnetic conductor 75 may be manufactured in a band shape, and then, one end and the other end may be bonded using an adhesive or the like after the lens holder 55 is wrapped.

The nonmagnetic conductor 75 is made of a copper plate or an aluminum plate, which is a nonmagnetic material and a conductor at the same time.

Hereinafter, an operation process of the first embodiment of the present invention having the above configuration will be described.

When the user presses the photographing button through the keypad installed in the communication device, the controller drives the image sensor 80 to capture an image of the subject passing through the lens group.

The image sensor 80 converts the captured image into an electrical signal and transmits it to a controller in the main body through a main PC ratio.

If the captured image is not clear, the controller which receives the image applies power to the coil 72 to perform focusing adjustment.

At this time, the current direction applied to the upper coil 72a and the current direction applied to the lower coil 72b are opposite to each other.

In addition, the upper coil 72a and the lower coil 72b are divided in the vertical direction by the middle seating protrusion 58 so as not to be in contact with each other, thereby minimizing the influence of the currents applied in the opposite directions. .

When power is applied to the coil 72, an electromagnetic force is generated according to Fleming's left hand law under the influence of the magnetic flux from the magnet 71, so that the coil 72 moves in the optical axis direction.

Therefore, the lens holder 55 in which the coil 72 is fixed also moves in the optical axis direction so that the focusing of the lens group is adjusted to make the captured image clear.

In this process, the leaf spring 65 serves to guide the lens holder 55 to be accurately driven in the optical axis direction.

In addition, the nonmagnetic conductor 75 generates a eddy current damping force in a direction opposite to the direction of movement in the magnetic field formed by the magnet 71 to quickly attenuate the vibration of the lens holder 55.

That is, the lens holder 55 in which the coil 72 is fixed at the same time as the coil 72 is moved at the same time, and is fixedly coupled to the lens holder 55 by the shandong of the lens holder 55. The non-magnetic conductor 75 is also used in Shanghai.

As the non-magnetic conductor 75 moves up and down in the magnetic field of the magnet 71, a eddy current damping force is generated in a direction opposite to the movement direction of the non-magnetic conductor 75 so that the lens holder 55 is moved. It quickly attenuates the vibration caused by the shanghai-dong.

At this time, a eddy current damping force is applied to the nonmagnetic conductor 75. The nonmagnetic conductor 75 has the upper seating protrusion 56, the lower seating protrusion 57, and the middle seating protrusion 58 in the vertical direction. Since the eddy current damping force acts on the non-magnetic conductor 75, the non-magnetic conductor 75 can be prevented from escaping from the lens holder 55 in the vertical direction.

Accordingly, the time for imaging the image of the subject by the image sensor 80 becomes faster.

Second embodiment

4 is a perspective view illustrating a coupling structure of a lens holder and a nonmagnetic conductor according to a second embodiment of the present invention, and FIG. 5 is a cross-sectional view of a compact camera device according to a second embodiment of the present invention.

Compared to the first embodiment, the second embodiment is similar to the lens, the fixing part 60, the leaf spring 65, the magnet 71, the coil 72, the image sensor 80, etc. Omit.

In the lens holder 55 of the present embodiment, an upper seating protrusion 56, a lower seating protrusion 57, and a middle seating protrusion 58 are formed.

The protruding length of the middle seating protrusion 58 is smaller than the protrusion lengths of the upper seating protrusion 56 and the lower seating protrusion 57 and larger than the thickness of the coil 72.

In addition, the nonmagnetic conductor 75 is composed of one and covers all of the upper coil 72a, the middle seating protrusion 58, and the lower coil 72b between the upper seating protrusion 56 and the lower seating protrusion 57. .

That is, in the first embodiment, the nonmagnetic conductor 75 is separated into an upper nonmagnetic conductor 75a and a lower nonmagnetic conductor 75b, and each of the upper and lower portions of the upper and lower portions of the middle seating protrusions 58 is disposed. Is placed.

However, the second embodiment has a structure in which the nonmagnetic conductor 75 is composed of one and covers not only the upper coil 72a and the lower coil 72b but also the middle seating protrusion 58 together.

The operation process of this second embodiment is the same as the operation process of the first embodiment described above and will be omitted below.

The small camera device of the present invention is not limited to the above-described embodiment, but can be modified and implemented in various ways within the scope of the technical idea of the present invention.

1 is a perspective view showing a coupling structure of a lens holder and a nonmagnetic conductor according to a first embodiment of the present invention;

2 is a cross-sectional structure diagram of a compact camera device according to a first embodiment of the present invention;

3 is a view for explaining the damping principle of a small camera device according to the present invention;

4 is a perspective view showing a coupling structure of a lens holder and a nonmagnetic conductor according to a second embodiment of the present invention;

5 is a cross-sectional structure diagram of a compact camera device according to a second embodiment of the present invention;

6 is a cross-sectional structure diagram of a conventional small camera device of the VCM method,

7 is a cross-sectional structural view of the state of use of the small camera device shown in FIG.

8 is a graph showing a correlation between the vibration of the lens unit and time shown in FIG. 6;

<Description of the symbols for the main parts of the drawings>

55: lens holder, 56: upper seating protrusion, 57: lower seating protrusion, 58: middle seating protrusion,

60: fixed part, 65: leaf spring, 71: magnet, 72: coil, 72a: upper coil, 72b: lower coil, 75: nonmagnetic conductor, 75a: upper nonmagnetic conductor, 75b: lower nonmagnetic conductor, 80: Image Sensor,

Claims (5)

A lens holder mounted with a lens and driven in an optical axis direction; A fixing part incorporating the lens holder; A leaf spring disposed above or below the lens holder to support and connect the lens holder to the fixing unit so that the lens holder flows in the optical axis direction; A magnet fixed to the fixing part in the lens holder direction; A coil surrounding the lens holder to be exposed to the magnetic field of the magnet; It is made of a non-magnetic conductor surrounding the lens holder in parallel with the coil to be exposed to the magnetic field of the magnet, An upper seating protrusion protrudes from an upper circumferential surface of the lens holder, a lower seating protrusion protrudes from a lower circumferential surface of the lens holder, and a central seating protrusion protrudes from an outer circumferential surface of the center of the lens holder. Formed, The coil and the nonmagnetic conductor are mounted to surround the lens holder between the upper seating protrusion and the lower seating protrusion, The protruding length of the upper seating protrusion and the lower seating protrusion is equal to or larger than the combined thickness of the coil and the nonmagnetic conductor, The coil is, An upper coil disposed between the upper seating protrusion and the middle seating protrusion; It consists of a lower coil disposed between the middle seating projection and the lower seating projection, Current directions applied to the upper coil and the lower coil are opposite to each other, The magnet is arranged in a different polarity in the vertical direction, And the upper seating protrusion, the bottom seating protrusion and the middle seating protrusion are formed in parallel in the protruding direction, respectively. delete delete The method of claim 1, The protruding length of the middle seating protrusion is equal to or greater than the combined thickness of the coil and the nonmagnetic conductor, The nonmagnetic conductor, An upper nonmagnetic conductor covering the upper coil; Small camera device, characterized in that consisting of a lower non-magnetic conductor covering the lower coil. The method of claim 1, The protruding length of the middle seating protrusion is smaller than the protrusion length of the upper seating protrusion and the lower seating protrusion and larger than the thickness of the coil, The non-magnetic conductor is a compact camera device that covers all of the upper coil, the middle seating projection and the lower coil between the upper seating projection and the lower seating projection.

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