KR100459485B1 - Double stepping motor assembly and a miniature optical apparatus provided with the same - Google Patents

Abstract

The present invention discloses a double tank stepping motor assembly and a compact optical device having the same. The motor assembly of the present invention comprises two sets of power generating means for intermittently generating power by receiving an external power, coupled to the power generating means, and a power transmission means for transferring the power generated by the power generating means to the driven power supply; And a coupling means for coupling two sets of power generating means to each other, and the optical device of the present invention is coupled to two sets of power generating means for generating power intermittently by receiving an external power source, and is coupled to the power generating means and generates power. And a power transmission means for transmitting the power generated by the means to the lens assembly, and a coupling means for coupling the two sets of power generating means to each other. For this reason, by forming two sets of divided motors as an assembly, the same rotational force as that of a large motor can be generated.

Description

Double stepping motor assembly and a miniature optical apparatus provided with the same

The present invention relates to a stepping motor, and more particularly, to a two-step stepping motor assembly that can reduce the size of the motor by generating a rotational force of one stepping motor using two divided small stepping motor.

The present invention also relates to a compact optical device that can be downsized by having a divided two-joint stepping motor assembly.

Stepping motor is also called pulse motor because it rotates by a certain angle unit in accordance with input pulse, and it is used in simple movement control system such as micro mouse because current position information can be known without feedback of position information. Also, in recent years, a mobile phone with a built-in camera has appeared, and a lot of small stepping motors have appeared for the zoom function of the built-in camera.

8 shows an example of a conventional stepping motor installed in a small camera embedded in a mobile phone. The stepping motor of FIG. 8 is described in Japanese Patent Application No. 189249 filed on June 22, 2001.

As shown, a conventional stepping motor has a rotor 10 composed of a cylindrical magnet 11 and a shaft 12, an inner yoke 21 and an outer yoke 23, and a coil bobbin disposed between two yokes. It has the stator 20 provided with 22.

The inner yoke 21 has a flat plate portion 21a and a plurality of extreme tooth portions 21b, and the outer yoke 23 has a flat plate portion 23a and a plurality of extreme tooth portions 23b.

A coil is wound around the outer circumferential surface of the coil bobbin 22, and a terminal portion 22a having a terminal pin 26 is formed at the outer circumferential end thereof.

A washer 13 is placed between the rotor 10 and each stator 20, and a spacer 34 having a projection 34a formed at the outer circumferential end thereof is placed.

This stepping motor is assembled such that the shaft 12 of the rotor 10 penetrates through the boss 24 and the bearing 33, mounts the assembly to the case 31, and opens the outer circumferential surface of the case 31 with the bracket 32. It is made by sealing 31a.

However, such a conventional stepping motor has a limit in miniaturizing its size while having the same rotational force according to the basic principle that the rotational force of the motor depends on the area of the magnet to be embedded therein.

In addition, since two sets of rotors are arranged in opposite directions, there is a limit in miniaturizing the size of the motor.

In addition, since it was difficult to miniaturize the stepping motor, there was a limit in miniaturization of the optical apparatus having the same.

The present invention has been made to solve the above-mentioned problems of the prior art. It is an object of the present invention to provide a two-step stepping motor assembly capable of generating the same rotational force as a larger motor by forming two separate sets of motors into assemblies.

Another object of the present invention is to provide a two-step stepping motor assembly that can be downsized by placing two sets of yokes (rotors) in the same direction.

It is yet another object of the present invention to provide a miniature optical device which can be miniaturized by mounting a double tank stepping motor assembly.

1 is a schematic perspective view of a miniature optical device having a double tank stepping motor assembly according to a preferred embodiment of the present invention;

FIG. 2 is a schematic perspective view illustrating a coupling state of a part of a two-chamber stepping motor assembly and a lens assembly provided in the optical device of FIG. 1; FIG.

3 is a top view of FIG. 2;

4 is an exploded perspective view of the two-step stepper motor assembly of FIG. 1;

5 is a cross-sectional view taken along line A-A of FIG. 4;

FIG. 6 is a cross-sectional view taken along line B-B of FIG. 4 and showing a state in which the lens assembly is in an upward position; FIG.

FIG. 7 is a cross-sectional view showing a state in which the lens assembly is lowered along the line B-B of FIG. 4; FIG. And

8 is a schematic exploded perspective view of a stepping motor of the prior art.

<Explanation of symbols for main parts of drawing>

100; Two tank stepping motor assembly 111; Axis of rotation

112; Magnet 113; washer

114; Inner yoke 115; coil

116; Coil bobbin 117; Outer yoke

118; Housing 119; Metal bearing

120; Plate 130; Base

140; Gear case 150; cover

200; Lens assembly

In order to achieve the object of the present invention described above, the present invention is coupled to two sets of power generating means for generating power intermittently by receiving an external power source, coupled to the power generating means to supply the power generated by the power generating means It provides a two-step stepping motor assembly comprising a power transmission means for transmitting to the sieve, and a coupling means for coupling the two sets of power generating means to each other.

In the present invention, the power transmission means may include a second gear for transmitting power to the driven power supply by engaging between the first gear and the first gear coupled to each power generating means.

In the present power transmission means, the first gear may be smaller in diameter than the second gear.

In addition, in the present invention, the power generating means is a cylindrical housing, the outer peripheral surface of which is circumferentially divided in the circumferential direction of the rotor and the mutually interlocked on the other pole, and a plurality of extreme values overlapping with each other to accommodate a part of the rotor It may include a stator for selectively forming a magnetic field.

In addition, the power generating means is a cylindrical housing, a rotating shaft which is built into the housing, and the outer circumferential surface thereof is circumferentially partitioned in a circumferential direction and magnetized to the other pole, and accommodates a plurality of protruding first pole teeth. A first yoke having a second yoke, a second yoke having a plurality of protruding second extremes to accommodate the first yoke and being offset from the first extreme value, and disposed between the first yoke and the second yoke and coiled on the outer circumferential surface thereof. It may be an electric motor including the wound coil bobbin.

Here, the first yoke and the second yoke may be arranged in the same direction as the first extreme value and the second extreme value.

In addition, the present invention is a pair of power generating means for generating power intermittently by receiving an external power source, the power transmission means coupled to the power generating means for transmitting the power generated by the power generating means to the lens assembly, 2 It provides a compact optical device having a two-step stepping motor assembly comprising a coupling means for coupling the power generating means of the bath to each other.

In the present invention, the power transmission means includes a first gear coupled to each power generating means, a second gear meshed between the first gear, and a third gear meshed with the second gear to transfer power to the lens assembly. can do.

In the present power transmission means, the first gear may be smaller in diameter than the second gear.

In addition, in the present invention, the power generating means is a cylindrical housing, a rotating shaft which is built into the housing, the outer circumferential surface is coupled to the outer peripheral surface of the circumferentially partitioned magnet magnets and magnetized to the other pole, and accommodates a plurality of protrusions A first yoke having a mold first extreme value, a second yoke having a plurality of protruding second extreme values for accommodating the first yoke and shifting from the first extreme value, and disposed between the first yoke and the second yoke. It may be an electric motor including a coil bobbin wound around the outer peripheral surface of the coil.

Here, the first yoke and the second yoke may be arranged in the same direction as the first extreme value and the second extreme value.

Hereinafter, with reference to the accompanying drawings will be described in detail with respect to a two-chamber stepping motor and a compact optical device having the same according to an embodiment of the present invention.

1 shows a compact optics 1000 having a two stage stepping motor assembly in accordance with a preferred embodiment of the present invention.

The optics 1000 includes a base 130 supporting the built-in motor assembly and a cover 150 covering the motor assembly.

The double tank stepping motor assembly 100 incorporated in the miniature optical apparatus 1000 will be described in detail with reference to FIGS. 2 to 7.

As shown in FIG. 2 and FIG. 3, the motor assembly 100 has a first gear 122 mounted on each shaft, and a second gear 123 is placed between the first gear 122 and engaged with each other.

The second gear 123 meshes with the third gear 124, and the third gear 124 is coupled to the screw shaft 121 screwed to the second protrusion 203 of the lens assembly 200.

Therefore, the power generated in the motor assembly 100 is transmitted to the lens assembly 200 through the first gear 122, the second gear 123, and the third gear 124, and thus the lens assembly 200. Is driven.

Here, the first gear 122 is smaller than the second gear 123, and thus the intermittent fine movement of the lens assembly 200 is possible.

FIG. 4 shows a compact optical device having the two-chamber motor assembly 100 shown in FIG. 1.

The optical device includes a base 130 and a cover 150.

The base 130 has a motor assembly insertion hole 131 into which the motor assembly 100 is inserted and a lens assembly insertion hole 132 into which the lens assembly 200 is inserted.

In addition, the base 130 is formed with a guide bar 133 for guiding the movement of the lens assembly 200.

The cover 150 is formed with a second opening 151 for exposing the lens 201 of the lens assembly 200 to the outside.

The double tank stepping motor assembly 100 includes a rotating shaft 111, a magnet 112, an inner yoke 114, an outer yoke 119, a plate 120, and the like. Here, the rotating shaft 111 and the magnet 112 correspond to the stator of the motor, and the inner yoke 114 and the outer yoke 119 correspond to the rotor of the motor.

The rotating shaft 111 has a shaft bar 111a and a shaft protrusion 111b protruding along the outer periphery near the center of the shaft bar 111a.

The magnet 112 has a donut shape and is coupled to the shaft rod 111a of the rotation shaft 111.

In addition, the magnet 112 has an outer circumferential surface divided into eight to magnetize each other. In this embodiment, the pole of the magnet 112 is divided into eight, but the number of division is not limited.

Two sets of washers 113 are coupled to the top and bottom of the rotation shaft 111, respectively.

In addition, the inner yoke 114 is coupled to the lower portion of the rotating shaft 111 to which the washer 113 is coupled.

The inner yoke 114 forms four first extreme tooth portions 114a at equal intervals thereon. However, the number is not limited, and the number of poles corresponding to half of the polar fraction of the magnet 112 is provided.

In addition, the inner yoke 114 forms a boss 114b at the lower portion thereof. The boss 114b forms a first hole 114c into which the rotation shaft 111 is inserted.

The coil 115 is wound around the outer circumferential surface of the coil bobbin 116. In addition, the coil bobbin 116 forms a second hole 116a through which the boss 114b penetrates in the center thereof.

The inner yoke 114 to which the coil bobbin 116 is coupled is coupled to the outer yoke 117.

The outer yoke 117 forms four second extreme tooth portions 117a at equal intervals on the upper surface thereof, and the third hole 117b through which the boss 114b formed in the inner yoke 114 penetrates in the center thereof. Form.

At this time, when the inner yoke 114 is coupled to the outer yoke 117, the first extreme teeth 114a formed on the inner yoke 114 and the second extreme teeth 117a formed on the outer yoke 117 are disposed to be offset. It is desirable to.

The first metal bearing 119a is mounted on the lower portion of the rotation shaft 111 coupled with the inner yoke 114 and the outer yoke 117. The first metal bearing 119a is fitted into the fourth hole 120a formed in the plate 120.

In addition, a second metal bearing 119b is mounted on the rotary shaft 111. The second metal bearing 119b is fitted to the first opening 118a formed in the housing 118.

The screw shaft 121 coupled to the lens assembly 200 is disposed between the two housings 118 bonded to each other. On the outer circumferential surface of the screw shaft 121, a male screw portion 121a is formed by a predetermined length.

In addition, the gear case 140 is fitted to the upper portion of the rotating shaft 111.

In the gear case 140, a fifth hole 140a through which the rotating shaft 111 penetrates and a sixth hole 140b through which the screw shaft 121 penetrates are formed.

In addition, the gear case 140 is formed with cylindrical first, second and third recesses 141a, 141b and 141c having a depth corresponding to the thickness of each gear.

Accordingly, the first gear 122, the second gear 123, and the third gear 124 are each other in the first, second, and third recesses 141a, 141b, and 141c formed in the gear case 140. Are interlocked.

The lens assembly 200 includes a lens 201.

In addition, a first protrusion 202 coupled to the guide bar 133 formed on the base 130 is formed on the outer circumferential surface of the lens assembly 200.

In addition, a second protrusion 203 coupled to the screw shaft 121 is formed on the outer circumferential surface of the lens assembly 200. The second projection portion 203 is provided with a female screw portion (203a in FIG. 6) corresponding to the male screw portion 121a formed on the screw shaft 121.

The assembled state of the components shown in FIG. 4 is shown in sectional view in FIG.

The magnet 112 is coupled to the shaft protrusion 111b on the rotating shaft 111, and two washers 113 are coupled to the top and bottom thereof, respectively.

The rotating shaft 111 coupled with the magnet 112 and the washer 113 is coupled to the inner yoke 114, and the inner yoke 114 has a third hole 117b having a boss 114b formed in the outer yoke 117. It is coupled to the outer yoke 117 to penetrate.

At this time, the coil bobbin 116 wound around the outer peripheral surface of the boss 114b is coupled.

The first metal bearing 119a is coupled to the lower end of the rotary shaft 111, and the first metal bearing 119a is coupled to the fourth hole 120a formed in the plate 120.

The upper portion of the rotating shaft 111 passes through the first opening 118a formed in the housing 118, and the second metal bearing 119b is coupled thereto.

In addition, the first gear 122 is coupled to the distal end of the upper portion of the rotary shaft 111.

6 and 7 show a state in which the lens assembly 200 is operated by the motor assembly 100 described above.

When the motor assembly 100 operates to generate power, the rotating shaft 111 of the motor rotates in one direction, and the first gear 122 coupled to the rotating shaft 111 rotates. At this time, the second gear 123 meshed with the first gear 122 rotates.

In addition, when the second gear 123 rotates, the third gear 124 meshed with the second gear 123 rotates.

At this time, the screw shaft 121 coupled to the third gear 124 rotates at the same time, and the lens assembly 200 screwed to the screw shaft 121 is moved upward by the second protrusion 203.

If the rotating shaft 111 of the motor rotates in the other direction, the first gear 122 coupled to the rotating shaft 111 rotates in the same direction. At this time, the second gear 123 meshed with the first gear 122 rotates.

In addition, when the second gear 123 rotates, the third gear 124 meshed with the second gear 123 rotates.

In this case, the screw shaft 121 coupled to the third gear 124 rotates at the same time, and the lens assembly 200 screwed to the screw shaft 121 is moved downward by the second protrusion 203.

According to the two-stage stepping motor of the present invention and the compact optical device having the same, it is possible to generate the same rotational force as a large-sized motor by forming two divided motors as an assembly.

The present invention also provides a two-step stepping motor that can be downsized by arranging two sets of yokes (stators) in the same direction.

In addition, the compact optical device of the present invention can be further miniaturized than the conventional optical device by mounting a two-step stepping motor.

In the above, the two-step stepping motor of the present invention and the compact optical device having the same have been described with reference to the preferred embodiment of the present invention. However, modifications, changes, and various modifications can be made without departing from the spirit of the present invention. It is obvious to

Claims (11)

Two sets of power generating means for intermittently generating power by receiving external power; A power transmission means coupled to the power generating means and transferring power generated by the power generating means to a driven power supply; And And two coupling means for coupling the two sets of power generating means to each other. The method of claim 1, wherein the power transmission means is characterized in that it comprises a first gear coupled to each of the power generating means and a second gear for transmitting power to the driven power supply in engagement with the first gear. Two tank stepping motor assembly. The two stepping motor assembly of claim 2, wherein the first gear has a smaller diameter than the second gear. The power generating means according to any one of claims 1 to 3, wherein Cylindrical housing; A rotor installed in the housing, the outer peripheral surface of which is divided in the circumferential direction and interlocked with the other electrode; And And a stator for receiving a portion of the rotor and having a plurality of extreme values overlapping each other to selectively form a magnetic field. The power generating means according to any one of claims 1 to 3, wherein Cylindrical housing; A rotating shaft embedded in the housing; A cylindrical magnet coupled to the rotating shaft and the outer peripheral surface of which is split in the circumferential direction and magnetized to another pole; A first yoke for receiving the magnet and having a plurality of protruding first extremes; A second yoke for accommodating the first yoke and having a plurality of protruding second extremes to deviate from the first extremes; And And an electric motor disposed between the first yoke and the second yoke and including a coil bobbin wound around the outer circumferential surface thereof. 6. The two set stepping motor assembly according to claim 5, wherein the first yoke and the second yoke are arranged in the same direction in which the first extreme value and the second extreme value are arranged. Two sets of power generating means for intermittently generating power by receiving external power; A power transmission means coupled to the power generating means and transferring power generated by the power generating means to the lens assembly; And And a coupling means for coupling said two sets of power generating means to each other. The method of claim 7, wherein the power transmission means is coupled to the first gear coupled to each of the power generating means, the second gear engaged between the first gear, and the second gear to transfer power to the lens assembly. Small optical device having a two-step stepping motor assembly, characterized in that it comprises a third gear. 10. The miniature optics of claim 8, wherein the first gear is smaller in diameter than the second gear. The power generating means according to any one of claims 7 to 9, Cylindrical housing; A rotating shaft embedded in the housing; A cylindrical magnet coupled to the rotating shaft and the outer peripheral surface of which is split in the circumferential direction and magnetized to another pole; A first yoke for receiving the magnet and having a plurality of protruding first extremes; A second yoke for accommodating the first yoke and having a plurality of protruding second extremes to deviate from the first extremes; And And an electric motor disposed between the first yoke and the second yoke and including a coil bobbin wound around an outer circumferential surface thereof. 11. The compact optical device of claim 10, wherein the first yoke and the second yoke have the first pole value and the second pole value disposed in the same direction.