KR20170032916A - Apparatus for controlling of elasiticity in a mold pattern forming machine for light guide plate - Google Patents

Abstract

The present invention relates to an elasticity control device for a pattern forming machine for a mold of producing a light guide plate and, specifically, an elasticity control device for a pattern forming machine for a mold of producing a light guide plate using magnetism. According to the present invention, a pattern forming head includes: a piezoelectric element vertically vibrating in accordance with applied voltage; an elastic member holder vertically vibrating in accordance with vibration of the piezoelectric element and having a hole at a lower end; a bit tool holder protruding to the outer side of the elastic member holder through a hole, wherein the upper end is located in the elastic member holder and the lower end is inserted into the hole formed at the lower end of the elastic member holder; and a bit tool mounted on the bit tool holder and having multiple dimples in a mold core. The elastic member holder includes: a first permanent magnet supporting the upper surface of the bit tool holder; a second permanent magnet located in the upper part of the first permanent magnet and having a repulsive force in the first permanent magnet; and a pressure control unit controlling pressure applied to the upper surface of the bit tool holder by controlling a vertical position of the second permanent magnet.

Description

TECHNICAL FIELD [0001] The present invention relates to an apparatus for adjusting the elasticity of a pattern processing machine for a mold for producing a light guide plate,

BACKGROUND OF THE INVENTION Field of the Invention [0001] The present invention relates to an elasticity adjusting device for a pattern processing machine for producing a light guide plate, and more particularly, to an elasticity adjusting device for a pattern processing machine for producing a light guide plate using magnetic force.

Korean Patent No. 10-1299974 issued to the present applicant discloses an apparatus for forming a perforation pattern having a depth of 10 μm or less and an error range of ± 100 nm on the surface of a mold for producing a light guide plate using a piezoelectric element.

The device is vertically coaxially aligned with the piezoelectric element 11, the elastic member holder 13, the byte holder 15 and the bite 16, as shown in Figs. This device is configured such that when a current is applied to the piezoelectric element 11, the length of the piezoelectric element 11 instantaneously increases and the elastic member holder 13 located at the lower end, the byte holder 15 and the bite 16 rapidly descend Thereby hitting the surface of the mold and forming a hemispherical hole on the mold surface by blowing.

A spring member 144 is embedded in the elastic member holder 13 to adjust the perforation depth. The spring member 144 is located between the throttle plate 133 and the bite holder 15, which move in the screwing direction along the adjusting screw 132 formed at the central portion. The elasticity of the spring member 144 is greatly reduced and the elasticity of the spring member 144 is reduced to strongly support the bite holder 15 and the bite 16 does not retreat when hitting the metal mold, The depth of the perforation increases. On the other hand, when the throttle plate 133 is lifted up to the maximum, the spring member 144 is slightly compressed to increase elasticity, weakly supporting the bite holder 15, and retracted when the bite 16 hits the metal mold , The depth of the piercing hole becomes smaller.

The rotation of the throttle member 144 causes the spring member 144 to be twisted in the rotational direction together with the upward and downward pressing. Therefore, when the adjustment plate 133 is moved up and down to adjust the perforation depth, the vertical movement amount of the adjustment plate 133 and the vertical compression amount of the spring member 144 do not exactly coincide with each other, It is difficult to finely adjust the perforation depth according to the movement of the second electrode 133.

3 and 4, when the spring member is composed of a plurality of springs, for example, an inner spring for maintaining a minimum holding force in a state where the position of the throttle plate 133 is maximized, and an inner spring In the case of using a double-pipe type spring member composed of an outer spring used to maintain a constant tension, there is a problem in that the non-uniformity of the force applied to the inner and outer springs together with the above problem and the friction between the spring member 144 and the upper- As a result, there is a problem that the perforation depth moves in the direction opposite to the prediction. For example, when a downwardly deeper perforation is required to lower the perforation 133, the perforation depth may become shallower or the perforation may be slightly shallower. Thus, if the perforation 133 is raised, appear.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a percussion device capable of precisely controlling the supporting force of a bite holder by moving up and down a throttle plate.

Another problem to be solved by the present invention is to provide a new pattern forming head including a perforation device capable of precisely controlling the supporting force of the bite holder through the lifting and lowering of the throttle plate.

A further object of the present invention is to provide a patterning machine for producing a light guide plate, which has a new pattern forming head including a perforating device capable of accurately controlling the supporting force of the bite holder through the lifting and lowering of the throttle plate.

According to an aspect of the present invention, there is provided a pattern formation head comprising: a piezoelectric element vibrating up and down according to an applied voltage; An elastic member holder vibrating up and down according to the vibration of the piezoelectric element and having a hole formed at a lower end thereof; The upper end being located inside the elastic member holder and the lower end being inserted into the hole formed at the lower end of the elastic member holder and projecting out of the elastic member holder through the hole; And a plurality of dimples mounted on the die holder to form a plurality of dimples on the mold core, wherein the elastic member holder comprises: a first permanent magnet supporting an upper surface of the bite holder; A second permanent magnet having a repulsive force with respect to the first permanent magnet and a pressure regulating means for regulating the pressure applied to the upper surface of the bite holder by adjusting the vertical position of the second permanent magnet .

In the present invention, the pressure regulating means comprises an adjusting screw formed in the center of the elastic member holder, and a throttle plate moving up and down along the adjusting screw, and a second permanent magnet attached to the lower portion.

According to the present invention, there is provided a method for precisely finely controlling a bearing force of a bite holder through an up and down movement of a throttle plate to which a permanent magnet is attached.

The first permanent magnet for pressing the bite holder interacts with the second permanent magnet moving along the throttle plate in a non-contact manner, and it is possible to prevent a distortion phenomenon appearing when the elastic member is twisted by the rotation of the throttle plate have.

Further, there is no limitation in physical compression of the elastic member such as a spring, and it is possible to have a high leaf spring force in a narrow space.

According to the present invention, there is provided a new pattern forming head capable of precisely controlling the supporting force of the bite holder through ascending and descending of the throttle plate.

According to the present invention, there is provided a light guide plate production mold pattern processing machine having a new pattern formation head capable of precisely controlling the supporting force of the bite holder through lifting and lowering of the throttle plate.

1 (a) is a side view of a part attached to the element for suppressing electric charge at the lower end according to the longitudinal rail technique, and FIG. 1 (a)
FIG.
4 is a view showing the operation of the pattern forming head according to an embodiment of the present invention,
(Top dead center) and the right side shows the state where the byte is at the minimum height (bottom dead center).

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments of the present invention will be described with reference to the drawings. The following examples illustrate the invention and are not intended to limit the invention. Additional aspects, features, and advantages of the invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. In order to facilitate a clear understanding of the present invention, some of the elements in the figures may be exaggerated, omitted or schematically illustrated. Also, the size of each component does not entirely reflect the actual size.

5 is a view showing the overall patterning machine for a light guide plate producing mold according to the present invention. In the pattern machine, a stage portion 2 for fixing a mold core on a base 1 is positioned, and a leg-shaped header fixing portion 3 is placed thereon. The fixing portion 3 is provided with a pattern forming head 10 for forming a pattern on a mold core C placed on a stage. The mold core C is moved in the Y-axis direction (back and forth) on the stage portion 2 by the operation of a stepping motor and the pattern forming head 10 is moved in the X- Left and right) and the Z-axis direction (up and down). The structure, operation, and various modifications of the pattern forming machine except for the pattern forming head portion are well known to those skilled in the art, and a detailed description thereof will be omitted here.

Fig. 6 shows a pattern forming head 10 according to an embodiment of the present invention, and Fig. 7 shows a portion of the pattern forming head 10 excluding the piezoelectric element holding member 12. In each drawing, (A) is a side view and (B) is a cross-sectional view taken along the line NN in the side view. The detailed configuration of the pattern forming head 10 will be described in detail with reference to FIGS. 2 and 3. FIG.

6, the pattern forming head 10 includes a piezoelectric element 11. The piezoelectric element 11 is fixedly supported by the piezoelectric element fixing block 12 such that the longitudinal direction thereof is perpendicular to the longitudinal direction. do. The piezoelectric element fixing block 12 has a mounting portion 121 for mounting to the header fixing portion 3 of the pattern machine of FIG. 5 and a holder supporting portion 122 for slidably supporting the elastic member holder 13, .

As understood by a person skilled in the art, a piezoelectric element means a device having a piezoelectric phenomenon in which a voltage is generated when a mechanical pressure is applied and a mechanical deformation occurs when a voltage is applied. In other words, it refers to a device that has the property that electric polarization occurs when an external force is applied and a potential difference occurs, and when the voltage is applied, deformation occurs. In the present invention, the piezoelectric element 11 operates using the latter property. When a voltage of a predetermined frequency is applied to the piezoelectric element 11, the lower end (terminal) of the piezoelectric element 11 is shifted by a period corresponding to the frequency , And the reciprocating motion in which the length is increased and decreased repeatedly, that is, the vibration is caused.

An elastic member holder 13 is coupled to the piezoelectric element fixing block 12 under the piezoelectric element 11 so as to be slidable up and down while maintaining a vertical direction. To this end, the piezoelectric element fixing block 12 includes a holder supporting portion 122, and the elastic member holder 13 includes a sliding coupling portion 134 which is positioned between the piezoelectric element 11 and the holder supporting portion 122 And the LM guide 20 is positioned between the holder support portion 122 and the sliding engagement portion 134. [ The elastic member holder 13 receives up-and-down vibration of the piezoelectric element 11 and vibrates up and down at the same amplitude and period as the vibration of the lower end of the piezoelectric element 11. [ That is, when the lower end of the piezoelectric element 11 is elongated, the elastic member holder 13 is lowered by the extended length, and when the lower end of the piezoelectric element 11 is contracted, the elastic member holder 13 is lifted do. The spring 21 is fastened between the upper end of the sliding engagement portion 134 and the piezoelectric element fixing block 12 to raise the elastic member holder 13. When the piezoelectric element 11 is contracted, The member holder 13 is pulled.

6 and 7, a through hole 131 is formed in the lower portion of the elastic member holder 13, and the byte holder 15 is mounted through the elastic member holder 13.

The bite holder 15 is mounted in the elastic member holder 13 and a part of the bite holder 15 is located outside the elastic member holder 13 with respect to the elastic member holder 13, A relatively wide and flat head 151 and a leg 152 that is relatively narrow and elongated, preferably a polygonal, more preferably cylindrical. The outer diameter of the head portion 151 is formed to be larger than the inner diameter of the through hole 131 of the elastic member holder 13 so that the byte holder 15 is prevented from escaping downward from the elastic member holder 13. The vertical section of the byte holder 15 has a "T" shape, for example.

The head portion 151 is in contact with the lower inner surface of the elastic member holder 13 and the distal end of the leg portion 152 is located below the through hole 131 of the elastic member holder 13. [ The leg portion 152 is fitted with a bite 16 directly bumping against the mold core to directly form a plurality of dimples. The longitudinal center axes of the piezoelectric element 11 and the bite 16 are formed coaxially with each other and coincide with the central axis of the pattern forming head.

The through hole 131 of the elastic member holder 13 surrounds at least part of the leg portion 152 of the byte holder 15 so that the center axis of the byte holder 15 does not deviate from the central axis of the pattern forming head And the inner diameter of the through hole 131 is substantially the same as the outer diameter of the holder leg portion 152. [ Here, "substantially the same" means that a difference in diameter is large enough to allow the bite holder 15 to be displaced upward through the through hole 131 when an external force is applied below the bite holder leg portion 152, But it should be understood to include the meaning that it can exist.

The elastic member holder 13 is provided with a first permanent magnet 14 which is in contact with the upper surface of the head 151 of the bite holder 15 and a second permanent magnet 14 which applies a repulsive force to the first permanent magnet 14 And a second permanent magnet 19 is present.

The elastic member holder 13 includes a pressure adjusting means composed of an adjusting screw 132 and a throttle plate 133. The second permanent magnet 19 has a central portion Is inserted into the annular groove formed in the lower portion of the throttle plate 133. [ When the adjusting screw 133 is turned clockwise or counterclockwise, the height of the adjusting plate 133 increases or decreases as indicated by a block arrow. The first permanent magnet 14 and the second permanent magnet 19 are close to each other and the repulsive force is increased so that the first permanent magnet 14 presses the byte holder 15 more firmly. When the throttle plate 133 is raised, the distance between the first permanent magnet 14 and the second permanent magnet 19 is increased, so that the repulsive force is reduced and the bite holder 15 is pressed down more weakly.

The process of puncturing using the pattern forming head 10 according to the present invention is disclosed in Korean Patent No. 10-1299974 to the present applicant, which is hereby incorporated by reference in its entirety.

Fig. 8 shows the result of perforation while moving the gap between the magnets to 0 to 14.2 mm. As the distance between the magnets increases, the depth of the perforation and the diameter of the perforation decrease, and the depth changes linearly in the 4 to 6 micrometer range.

compare Example

In place of the magnets, the same device was pierced by adjusting the gap using a double spring as shown in Fig. With a target depth of 3.2 ㎛, the depth of the initial shot test (the function of setting the target depth by taking nine points) was 3.30 ㎛, so that the spring elastic adjustment screw was turned counterclockwise The result is that the depth is increased to 3.35 ㎛ due to the rotation of the spring and the friction between the upper and lower parts of the instrument. This is in contrast to the expectation that the elasticity of the spring will be reduced and the depth will be reduced.

The present invention relates to a method for manufacturing a piezoelectric element, and more particularly, to a piezoelectric element having a piezoelectric element and a method of manufacturing the piezoelectric element. : Semimicroscope 18: Semimicroscope stopper 19: Second permanent magnet 20: LM guide 21: Spring

Claims (2)

A piezoelectric element which vibrates up and down according to an applied voltage;
An elastic member holder vibrating up and down according to the vibration of the piezoelectric element and having a hole formed at a lower end thereof;
The upper end being located inside the elastic member holder and the lower end being inserted into the hole formed at the lower end of the elastic member holder and projecting out of the elastic member holder through the hole; And
And a plurality of dimples mounted on the die holder to form a plurality of dimples on the die core,
Wherein the elastic member holder comprises: a first permanent magnet supporting an upper surface of the bite holder; a second permanent magnet located on the first permanent magnet and having a repulsive force with respect to the first permanent magnet; And a pressure regulating means for adjusting the pressure applied to the upper surface of the byte holder by adjusting the vertical position. The pattern forming head according to claim 1, wherein the pressure regulating means comprises an adjusting screw formed at a central portion of the elastic member holder, and a throttle plate moved up and down along the adjusting screw and having a second permanent magnet attached to its lower portion.

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