JP2009160722A - Micro coil and its manufacturing method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a straight metallic micro coil without burrs the outer diameter of which is 100 μm or less, and which satisfies length/outer diameter = aspect ratio 30 or more. <P>SOLUTION: A resist is applied to an outer surface of a metallic micro pipe, and exposure beam is applied to spirally scanning and exposing. At this time, the inclination and height of the micro pipe is adjusted in advance to expose so that the exposure beam spot is applied by a constant shape and size all the time, and a spiral space pattern with uniform line width is formed. When etching the micro pipe using the resist as a masking material, etching is rinsed during process, and then etching is continued. An etching speed is thereby averaged and predicted, and "burrs" are removed by performing etching up to the proper timing. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a metal-made straight microcoil having a coil outer diameter of 100 μm or less and a coil portion length of 20 times or more of the coil outer diameter, and a method of manufacturing the microcoil.

  Metal microcoils are used as various micromechanism components as coil springs because they are excellent in elasticity, easily obtain a desired spring constant, and have high durability against repeated deformation.

  Further, since the metal is a good electrical conductor, it can be used as a component of an ultra-small inductance element part or a micro electromagnetic coil.

  In the past, in order to produce a practical metal microcoil with a small coil outer diameter, a coil wire such as a thin and soft enamel wire was wound around a mandrel.

  When a microcoil is made by winding a wire in this way, bending stress or torsional stress is applied to the coil wire, so it is necessary to reduce the coil wire diameter to reduce the outer diameter of the microcoil. Met.

  That is, when the coil wire diameter is too thick with respect to the outer diameter of the microcoil, the coil wire is cut by bending stress or torsional stress.

  However, when the wire diameter of the coil is small, only a coil spring having a small spring constant can be obtained when used as a coil spring.

  In addition, since it is difficult to wind the coil wire around the mandrel with a uniform force at a uniform interval, when a long coil is formed, the coil is bent irregularly and a long continuous coil cannot be formed.

  Furthermore, when the cross-sectional shape of the coil wire is a shape having a flat side such as a rectangle or trapezoid, it is difficult to wind the flat side evenly so that it does not twist by tightly attaching it to a round mandrel. It was.

  On the other hand, in the method of manufacturing by winding the coil wire around the mandrel, it is difficult to accurately make the coil end face perpendicular to the coil axis even if the end winding is provided.

  Further, in the method of manufacturing by winding a coil wire around a mandrel, it has been difficult to provide a cylindrical portion in the coil end portion or in the middle of the coil for easy holding, or to improve straightness.

  Further, in the method of manufacturing by winding the coil wire around the mandrel, a cylindrical portion cannot be provided at the end of the coil. Therefore, a step or taper is provided on the cylindrical portion, and another part is accurately attached to the end of the coil. It was not possible to fit or position accurately.

  Also, in the method of manufacturing by winding the coil wire around the mandrel, the winding direction is appropriately reversed halfway in order to prevent bending or squeezing in the direction perpendicular to the axis when compressive deformation is applied to the coil. I couldn't even make a coil.

  On the other hand, Non-Patent Document 1 applies a resist on a copper pipe, forms a spiral space pattern by laser scanning lithography, uses the remaining resist film as a masking material, and wet-etches the copper pipe, A method of making a microcoil is disclosed.

  FIG. 14 is a diagram schematically showing a method of manufacturing a microcoil disclosed in Non-Patent Document 1.

  In this conventional method of manufacturing a microcoil, a resist 2 is applied onto a metallic micropipe 1 as shown in FIG. 6A, and then a spot of an exposure beam 6 from a laser 5 as shown in FIG. Is placed at the exposure start point 4 on the micropipe 1, and the micropipe 1 is spirally moved by the linear movement indicated by the arrow 27 by the X stage 10 and the rotational movement indicated by the arrow 28 by the X rotary stage 20 around the X axis. Then, the resist 2 is exposed in a spiral shape.

  A pinhole 19 is placed to shape the exposure beam 6, and the exposure beam 6 is narrowed by the lens 14.

  11 is a Y stage that adjusts the position in the Y-axis direction, 12 is a Z stage that adjusts the position in the Z-axis direction, and 22 is an azimuth rotating stage around the Z-axis. At the time of application, the spot of the exposure beam 6 is mechanically adjusted in advance so that the spot is scanned along the top edge of the micropipe 1.

  In the above description, X, Y, and Z are directions shown in FIG.

  From (c) onward, the micropipe 1 is drawn with the axis vertical in accordance with the arrangement posture in the following steps, and 31 is a photosensitive portion by scanning exposure shown in FIG.

  After scanning exposure, when immersed in the developer 32 as shown in (d), for example, when the positive resist 2 is used, the photosensitive portion melts in a spiral shape and a spiral space pattern 34 is obtained. Reference numeral 33 denotes a container for the developer 32.

  (E) shows a rinsing step after development, which is immersed in the development rinsing solution 35 to remove the developer 32 and stop development. Reference numeral 36 denotes a container for the developing rinse solution 35.

  Next, as shown in (f), the micropipe 1 in which the spiral space pattern 34 formed from the rinsing solution 35 is formed is immersed in the etching solution 37 as shown in (g), and the resist 2 is used as a masking material. The micro pipe 1 is wet etched. Reference numeral 38 denotes a container for the etching solution 37.

  (H) shows a rinsing step after etching, which is immersed in an etching rinsing solution 39 to remove the etching solution 37 and stop the etching. Reference numeral 40 denotes a container for the etching rinse liquid 39.

  The micropipe 1 is etched into a spiral shape, and a microcoil 42 can be manufactured as shown in (g) and (h).

  A technique for forming a desired resist pattern through the steps of (a) resist coating, (b) exposure, (d) and (e) development, and rinsing is a lithography technique.

  (I) shows a state where the microcoil 42 is taken out from the etching rinse liquid 39 with the resist 2 attached after the etching is completed and rinsed.

  Next, in order to remove the resist 2, as shown in (j), the microcoil 42 attached with the resist 2 is immersed in a solvent or a stripping solution that dissolves the resist 2, and the resist 2 is removed.

  The resist 2 may be removed by placing it in an apparatus that can dry-etch the resist 2 such as oxygen plasma.

  When the resist 2 is removed, the microcoil 42 is obtained as shown in (k).

  According to the microcoil manufacturing method disclosed in Non-Patent Document 1, since the coil wire is produced from the pipe without receiving an external force of bending or twisting, it becomes a straight coil without being bent.

  If the width of the portion remaining after etching is adjusted, the width of the coil wire can be increased or decreased regardless of the outer diameter of the coil.

Therefore, it is possible to easily manufacture microcoils having different spring constants regardless of the outer diameter and inner diameter of the coil.
Yoshihisa Kaneko, Kohei Hashimoto, Toshiyuki Horiuchi: Fabrication of micro-coils using laser scanning ribbon piper, MICROELECTRONIC GRONELGRON TECHN 83 (2006) pp. 1249-1252.

  However, in the conventional method disclosed in Non-Patent Document 1 described with reference to FIG. 14, as shown in Non-Patent Document 1, only a few turns of the coil length can be taken with respect to the coil outer diameter of 100 μm. It was. That is, the upper limit of coil length / coil diameter = aspect ratio was about 5 to 6 at most.

  One reason why the coil length cannot be increased is that it is difficult to determine the end point of etching when the micropipe 1 is wet-etched by forming a spiral space pattern by laser scanning lithography and using the remaining resist film as a masking material. This is because the margin of timing for pulling up the microcoil 42 from the etching solution is small.

  Since the object to be etched is a fine product, it is impossible to visually observe the microcoiled state during etching.

  Even if it is possible to perform magnified observation with a microscope or the like, it is impossible to check all portions of the completed coil during etching, so it is difficult to determine the end point of etching.

  The second reason why the coil length cannot be increased is that there is variation in the line width of the resist space pattern formed by lithography, and when the etching for microcoiling was performed, the width of the resulting coil wire varied. is there.

  When the pitch of the spiral pattern is constant, if there is a place where the line width of the resist space pattern is wider than other places, the width to be etched is widened, and the widths of adjacent coil elements are narrowed.

  In order to prevent the microcoil from being cut in a place where the coil wire width becomes narrow, it is necessary to stop the etching with a shorter etching time.

  However, if the etching is stopped with a shorter etching time, the “bar” 70 caused by the etching residue as shown in FIG. In FIG. 15, “burrs” 70a to 70f shown in FIG. 15 remain.

  As described above, according to the conventional technology, a shape close to that of a microcoil can be obtained in a short partial range, but a practical microcoil having a uniform line width over a long range and having no “flash” can be obtained. I couldn't.

  In order to make a long coil, it is necessary to make the line width of the spiral resist space pattern formed by lithography uniform between the lengths, and if the line width of the spiral resist space pattern is not uniform, The widths of the resulting microcoil strands cannot be made uniform, and a sufficient margin of timing for lifting the microcoil from the etching solution cannot be taken.

  In addition, the etching rate may vary depending on variations in the state of the etching solution, such as temperature, humidity, atmospheric pressure, developer lot, leaving date from the manufacturing date, leaving time after opening, amount of developing solution used, etc. Because it is slightly different, if the micropipe 1 is continuously immersed in the etching solution for a long time until it becomes the microcoil 42, the etching amount varies even if etching is performed for the same time under the same apparent conditions, and the microcoil having the same wire thickness can be obtained. It was difficult to get.

  Practical microcoil having a desired uniform wire width and a large coil length / coil diameter = aspect ratio unless the line width of the spiral resist space pattern is made uniform and the etching amount is not appropriately controlled Can't get.

  The number of turns of the microcoil described in Non-Patent Document 1 is at most several turns, the aspect ratio is at most 5-6, the coil wire width varies, and a part of the wire is shown in FIG. “Burr” 70a to 70f remained.

  As shown in FIGS. 15A to 70F in FIG. 15, the “flash” 70 is remarkably generated in the photographs of all the microcoils described in Non-Patent Document 1, and in the conventional technique described in Non-Patent Document 1. It is clear that it could not be avoided.

  According to a first aspect of the present invention, there is provided a microcoil manufacturing method comprising: a resist coating step for attaching a resist to an outer surface of a metallic micropipe having an outer diameter of 100 μm or less; and an exposure planned position on or near the resist film. The exposure beam spot is applied to at least two points of the resist with a light intensity that the resist does not sensitize, and the position, shape, and size of the exposure beam spot are the desired positions regardless of where the exposure beam spot comes. An exposure beam adjusting step of adjusting a relative inclination angle of the micropipe and the exposure beam and / or a position of the micropipe in the exposure beam irradiation direction so as to be within an allowable error range with respect to the shape and size; The exposure beam spot is set to a light intensity that the resist is exposed to, and the resist is spirally formed at a single place or a plurality of places. An exposure process in which exposure is performed over a length section of 20 times or more the outer diameter of the pipe, and the micropipe having the resist that is spirally exposed by the spiral exposure is immersed and / or flowed in a developer. A developing step of immersing the resist to form a spiral space pattern of the resist, and etching the resist by immersing and / or immersing the micropipes having the spiral space pattern of the resist formed through the step in an etching solution. Etch the micropipes exposed as the bottom of the spiral space pattern as a mask into a spiral shape, and once remove the micropipes from the etchant and immerse them in a rinse solution at least once before the etching is completed. Rinse to remove the etching solution by immersing and / or immersing, and removing the rinse solution Then, the micropipe is dipped and / or dipped again in the etching solution, and the micropipe exposed as the bottom of the spiral space pattern is further etched into a spiral shape using the resist as an etching mask. A microcoil having a value obtained by dividing the length of the coiled portion by the outer diameter is 20 or more, including an etching step of appropriately repeating the etching and the rinsing until a coil is formed.

  According to a second aspect of the present invention, there is provided a microcoil manufacturing method according to the present invention, wherein the microcoil manufacturing method according to the first aspect has the resist spiral space pattern at least once before the etching is completed. The micropipe is once taken out from the etching solution, rinsed to remove the etching solution by immersing and / or immersing in the rinsing solution, and after the step of removing the rinsing solution, the spiral groove of the removed micropipe is removed. It is characterized by providing a step of predicting the time required for the etching to be added by measuring the width and / or depth, and further performing the etching after predicting the time required for the etching.

  According to a third aspect of the present invention, there is provided a method of manufacturing a microcoil according to the present invention, wherein the microcoil manufacturing method according to the first and second aspects includes a plurality of spirals in an exposure step of exposing the resist in a spiral manner and a subsequent development step. In addition to forming a space pattern, forming a space pattern that circulates around the micropipes, and etching the micropipes using the resist as a masking material, etching the space pattern portions around the micropipes. The micropipe is cut to obtain a plurality of microcoils.

  The microcoil of the present invention according to claim 4 is a microcoil in which a metal micropipe having an outer diameter of 100 μm or less is continuously spirally etched at only one place to form a coil. The value obtained by dividing by the outer diameter is 20 or more.

  The microcoil of the present invention according to claim 5 is a microcoil in which a metal micropipe having an outer diameter of 100 μm or less is spirally etched at a plurality of locations to form a coil, and the total length of the coiled portion The value obtained by dividing by the outer diameter is 20 or more.

  The microcoil of the present invention shown in claim 6 is characterized in that in the microcoil shown in claim 4 and claim 5, the coiled portion is formed of two or more multi-threads.

  A microcoil according to a seventh aspect of the present invention is the microcoil according to the fifth aspect of the present invention, wherein the winding direction of the spiral portion of the plurality of portions etched into a spiral shape is reversed by about half. It is characterized by being.

  The microcoil of the present invention according to an eighth aspect is the microcoil according to the fourth to seventh aspects, wherein both ends of the metal pipe are coiled portions.

  A microcoil according to a ninth aspect of the present invention is the microcoil according to the fourth to seventh aspects, wherein one end or both ends of the metal micropipes are left without being coiled.

  The microcoil of the present invention as shown in claim 10 is the microcoil according to claim 9, wherein the metal micropipe part left at one end or both ends is left on the outer diameter side and / or inner diameter side. The method is characterized in that step processing or taper processing is performed.

  According to an eleventh aspect of the present invention, in the microcoil according to the ninth to tenth aspects, a through hole is provided in the metal micropipe portion left without being coiled at one or both ends.

  According to the manufacturing method of the microcoil of the present invention, the size and shape of the spot of the exposure beam can be kept constant with higher accuracy than before, and the position of the spot of the exposure beam with higher accuracy than that of the conventional method can be used. Since the resist attached to the outer surface of the metal pipe can be exposed at a predetermined position on the pipe, the line width of the spiral resist space pattern formed by lithography can be made uniform.

  In addition, according to the method of manufacturing a microcoil of the present invention, when a coil is manufactured by etching a metal pipe into a spiral shape, an appropriate etching end point can be estimated with much higher accuracy than in the prior art. It is possible to manufacture a microcoil with good line width accuracy, no “burrs”, and a uniform microcoil with a substantially rectangular cross-sectional shape.

  Furthermore, according to the method of manufacturing a microcoil of the present invention, the line width of the spiral resist space pattern formed by lithography can be made uniform and the etching accuracy can be improved. Therefore, it is possible to manufacture a microcoil having a straightness corresponding to the straightness of a metal micropipe used as a raw material and having a coil length / coil diameter = aspect ratio that is significantly larger than that of the prior art.

  On the other hand, according to the method for producing a microcoil of the present invention, a microcoil can be made in an arbitrary length range in an arbitrary part of a pipe. The remaining microcoil and the microcoil with the pipe portion left at one end can be easily manufactured.

  The microcoil of the present invention has a uniform coil wire width, is straight, and has no “burr”. Therefore, the variation in the spring constant when a large number of the same microcoil is manufactured is smaller than that of the conventional microcoil, Since there are no locally weak places, stress concentration is unlikely to occur, and durability against repeated deformation is high.

  In addition, since the width of the coil wire is uniform, it is possible to manufacture a microcoil from a metal pipe having the same inner and outer diameter by changing the width of the coil wire to a wider range than before, and the aspect ratio is much higher than before. Therefore, the spring constant and deformation range of the microcoil obtained with respect to the same inner and outer diameter can be set in a much wider range than before.

  When using a microcoil as a spring, it is necessary to accurately predict and manufacture the spring constant. However, according to the microcoil manufacturing method of the present invention, the width of the strand is controlled with high accuracy and is uniform. Therefore, it is possible to obtain a microspring having a desired spring property.

  Further, since the microcoil is homogeneous, when the microcoil is used as a spring against a compressive load, the microcoil does not deform greatly locally at a weak place, and the microcoil shrinks while keeping straight without being bent.

  Furthermore, even when used as a component of ultra-small inductance components or micro electromagnetic coils, the variation in electrical characteristics such as inductance and resistance when many of the same microcoils are manufactured is reduced, and the required electrical characteristics are reduced. A microcoil with it is obtained.

  Also, since the coil wire width is uniform, the pitch can be made smaller than before, and the aspect ratio can be made much larger than before, so the number of turns of the microcoil can be increased more than before, and the inductance can be reduced with a small outer diameter. A large microcoil can be obtained.

  Since there is no “burr”, when the microcoil is energized, no discharge or short circuit occurs at the “burr” position, and no fusing occurs.

  On the other hand, since the microcoil of the present invention is manufactured from the metal micropipes 1, both ends of the metal micropipes 1 are cut in parallel by cutting, grinding, etc. before coiling, and both ends of the metal micropipes 1 are aligned. If both ends of the microcoil are used, both ends of the microcoil can be made parallel, and when used as a compression coil spring, there is an advantage that it is difficult to cause the protrusion or bending in the direction perpendicular to the axis.

  Further, since the free length is the length of the metal micropipe 1 prepared first, there is an advantage that the length of an arbitrary microcoil can be easily set with high accuracy.

  By forming a space pattern that goes around the micropipe 1 and etching the micropipe 1 using the resist 2 as a masking material, the micropipe 1 is cut by etching the space pattern portion that goes around the micropipe 1. In addition, the length of an arbitrary microcoil can be easily set with high accuracy.

  Further, if the pipe part is left at both ends or one end of the microcoil, the guide or leading part is used when the pipe part is used as a gripping part or when the microcoil is inserted into a cylindrical guide as a compression coil spring. Or can be used as

  In addition, according to the present invention, it is possible to easily form a microcoil by forming a plurality of locations of the micropipe into a microcoil, and it is possible to obtain a microcoil in which the coil portion is linearly connected at the pipe portion.

  In this way, a microcoil in which a plurality of locations on a micropipe are made into a microcoil can be divided into coil portions to shorten the microcoil portion at each location in order to obtain a microcoil having the same spring constant. In addition, when used as a compression coil spring, buckling, bending, and folding are less likely to occur.

  Also, when microcoiling a plurality of locations on a micropipe, if the winding direction is changed almost in half, the microcoil bending due to the torsional stress of the coil part will occur in the opposite direction and cancel each other. Coils are less prone to buckling and bending.

  In addition, according to this invention, the microcoil which gave arbitrary processes, such as a level | step difference and a taper, to the inner diameter side and / or outer diameter side of the edge of the part which does not turn into a microcoil of a micropipe can also be obtained.

  In this way, when a step or taper is provided on the inner diameter side and / or outer diameter side of the end of the portion that is not made into a microcoil, other parts such as, for example, a state in which the position of the microcoil and the axial center and the axial direction are aligned, for example, A tip of a probe can be attached.

  Furthermore, according to the present invention, it is possible to obtain a microcoil having a through hole in a portion of the micropipe that is not formed into a microcoil. When the microcoil is used as a tension spring, a tow rope such as a thread or a wire is attached. Easy to do.

BEST MODE FOR CARRYING OUT THE INVENTION

  FIG. 1 is an explanatory view showing a method of manufacturing a microcoil according to the present invention.

  Since the outer diameter of the microcoil is actually about the same as that of human hair, the microcoil is drawn greatly enlarged, and the other components are drawn reduced.

  First, as shown in (a), a resist 2 such as a resist is attached to part or all of the surface of the metal micropipe 1.

  In order to attach the resist 2, the metal micropipe 1 may be suspended vertically and immersed in the resist 2 solution and pulled up at a predetermined speed.

  The operation of suspending the micropipe 1 vertically and immersing it in the solution of the resist 2 and pulling it up at a predetermined speed may be relative. The micropipe 1 may be fixed and the solution of the resist 2 may be moved up and down.

  In order to make the coating film thickness of the resist 2 uniform, the micropipe 1 may be appropriately rotated during or after the relative pulling operation, or the relative pulling speed may be appropriately changed during the pulling operation.

  The resist 2 may be applied to the micropipe 1 by a method such as spraying or leaving in a foggy atmosphere.

  Next, the micropipe 1 is attached to the chuck 3 of the exposure apparatus as shown in FIG. 5B, and the resist 2 places a spot of an exposure beam 6 from, for example, a laser 5 as an exposure light beam at or near the exposure start point 4. The exposure beam 6 is applied with a weak intensity, and the shape and size of the spot of the exposure beam 6 is observed with a camera 7, and an image 8 of the spot of the exposure beam 6 is copied to a television monitor 9. The chuck 3 is moved by moving the X stage 10, Y stage 11, and Z stage 12 of the exposure apparatus so that it hits the top of the pipe 1 and the spot image 8 of the exposure beam has the desired shape and size. Adjust the position.

  X, Y, Z are directions as shown in the figure, 13 is a beam splitter, 14 is a lens for focusing the exposure beam 6, 15 is a reflected light from the surface of the micropipe 1 of the exposure beam 6, A cable 16 connects the camera 7 and the television monitor 9.

  In order to irradiate the spot of the exposure beam 6 from the laser 5 with a weak intensity that the resist 2 does not sensitize, the output of the laser 5 may be weakened. However, in general, when the laser changes its output, it takes time until the output becomes stable. Therefore, it is possible to attach and detach the neutral density filter 17 for weakening the micropipe 1 so as to irradiate the micropipe 1 with an appropriate intensity while keeping the output light intensity of the laser stably constant. It is convenient to provide a shutter 18 for switching between passing and blocking of the exposure beam 6.

  The installation positions of the neutral density filter 17 and the shutter 18 may be arbitrary.

  Further, in order to make the exposure beam 6 a spot having a shape and size convenient for exposure, such as a small circle or rectangle, and hit the exposure start point 4 on the micropipe 1, the exposure beam 6 from the laser 5 is irradiated by the pinhole 19. It is preferable to shape the image so that an image of the exit of the pinhole 19 is formed at the exposure start point 4 on the micropipe 1.

  As the light source for obtaining the exposure beam 6, the illustrated laser 5 is simple, but it is not always necessary to use a laser. The exposure beam 6 is shaped by the pinhole 19, and the exit hole of the pinhole 19 is formed by the lens 14. If the above image is formed on the micropipe 1, an arbitrary light source capable of exposing the resist 2 such as a lamp light source may be used.

  Reference numeral 20 denotes an X rotation stage that rotates the micropipe 1 around the axis, that is, approximately the X axis. Reference numeral 21 denotes a rotation angle around the X axis and the Y axis by slightly moving the micropipe 1 around the X axis, the Y axis, and the Z direction. An inclination / height adjustment stage 22 for adjusting the position in the Z direction, and an azimuth rotation stage 22 for adjusting the angle around the Z axis of the micropipe 1.

  When observing the image 8 of the exposure beam spot on the television monitor 9, it is preferable that the micropipe 1 near the exposure beam spot hits the television monitor 9, so that the resist 2 is not exposed. It is further preferable to separately provide an illumination light source 23 that emits light of a wavelength or weak light that the resist 2 does not sensitize, and irradiates the illumination light that the resist 2 does not sensitize to the exposure start point 4 or an appropriate range in the vicinity thereof.

  A beam splitter 24 superimposes the light beam 25 from the illumination light source 23 on the optical path of the exposure beam 6.

  Since the position of the spot of the exposure beam 6 and the position of the micropipe 1 are relative, the position of the spot of the exposure beam 6 may be adjusted by moving the spot of the exposure beam 6 while the micropipe 1 is stationary. .

  Next, as shown in (c), the spot of the exposure beam 6 is applied to the exposure end point 26 or the vicinity thereof, and an image 8 of the spot observed by the camera 7 is transferred to the television monitor 9, and the exposure beam spot The tilt / height adjustment stage 21 and the azimuth rotation stage 22 of the exposure apparatus are moved so that the position hits the top of the micropipe 1 and the image 8 of the exposure beam spot has the desired shape and size. To adjust the position of the micropipe 1.

  For adjustment of the position in the Z-axis direction, the Z stage 12 may be used, or the tilt / height adjustment stage 21 and the Z stage 12 may be used in combination.

  Adjustment of the position, shape and size of the spot of the exposure beam 6 at or near the exposure start point 4 shown in (b), and adjustment of the spot of the exposure beam 6 at or near the exposure end point 26 shown in (c). The adjustment of the position, shape, and size is repeated as appropriate until the spot of the exposure beam 6 hits the top of the micropipe 1 at both positions and the spot has the desired shape and size.

  In addition to the exposure start point 4 or the vicinity thereof and the exposure end point 26 or the vicinity thereof, the spot of the exposure beam 6 hits the top of the micropipe 1 not only at one or a plurality of intermediate points, but the desired shape, It is even better if it is confirmed to be the size.

  Further, after the spot of the exposure beam 6 hits the top of the micropipe 1 at or near the exposure start point 4 or the vicinity thereof and at the exposure end point 26 or the vicinity thereof, the following steps are performed. If the micropipe 1 is moved along the path for moving the spot of the exposure beam 6 and the spot of the exposure beam 6 hits the top of the micropipe 1 over the entire exposure path, it is confirmed that the desired shape and size are obtained. good.

  In FIG. 1, since the exposure beam 6 is applied to the micropipe 1 from the top to the bottom, the spot of the exposure beam 6 is applied to the top of the micropipe 1, but the exposure beam 6 is horizontal. You may guess from the direction.

  It is obvious that the micropipe 1 may be installed in any direction, and for example, the micropipe 1 may be configured so that the axis is held vertically and the exposure beam 6 is applied from the horizontal direction.

  Next, the spot of the exposure beam 6 is placed at the exposure start point 4 of the micropipe 1, and the spot of the exposure beam 6 is changed to the resist 2 by removing the neutral density filter 17 or increasing the output of the laser 5. The micropipe 1 is linearly moved in the X-axis direction indicated by the arrow 27 and the X-axis indicated by the arrow 28 around the X-axis by the X stage 10 and the rotary stage 20 around the X-axis. A spiral motion is given by a combination of rotational motions, and the resist 2 is exposed in a spiral shape as shown in FIG.

  When the resist 2 is exposed in a spiral shape, a part of the resist 2 is exposed in a spiral shape, a plurality of separated positions are exposed in a spiral shape, or a plurality of separated positions are exposed. The direction of winding of the spiral may be reversed.

  Further, when one end or both ends exposed in a spiral form are to be the ends of the microcoil that is completed, or when the micropipe 1 is to be cut at an arbitrary position during etching, the surface of the micropipe 1 is circulated and connected. Thus, the resist 2 is exposed to form a space pattern.

  When it is desired to provide a through hole in the pipe portion of the micropipe 1 that is not formed into a microcoil during etching, the resist 2 is exposed in a spiral shape in addition to being exposed in a spiral shape.

  As described above, if the shutter 18 for opening and closing the optical path of the exposure beam 6 is provided, the start and end of exposure and / or the temporary stop and restart of exposure in the middle can be controlled by opening and closing the shutter 18. Can do.

  In the conventional microcoil manufacturing method described in Non-Patent Document 1, the exposure beam adjustment process shown in FIGS. 1B and 1C is not performed and the exposure process shown in FIG. 14B is entered. During the spiral scanning exposure, the shape, size and position of the spot of the exposure beam 6 on the resist 2 fluctuated, and it was impossible to uniformly expose the spiral.

  On the other hand, as described above, according to the present invention, since the exposure beam adjustment step is performed, the spot of the exposure beam 6 is formed on the resist 2 in the desired shape and size during the spiral scanning exposure. The resist 2 is uniformly exposed in the form of a spiral to the target line width because it hits the micropipe 1 uniformly.

  From (e) onward, the micropipe 1 is drawn with the axis vertical in accordance with the arrangement posture in the following steps, and 31 is a photosensitive portion by scanning exposure shown in FIG.

  Next, as shown in (f), the micropipe 1 with the resist 2 exposed in a spiral shape is immersed in the developer 32. Reference numeral 33 denotes a container for the developer 32.

  Instead of immersing in the stationary developer 32, the micropipe 1 with the resist 2 exposed in the spiral shape is immersed in the state where the developer 32 is flowed, or the resist exposed in the spiral shape is immersed. Alternatively, the developing solution 32 may be poured over the micropipe 1 labeled 2.

  That is, the micropipe 1 with the resist 2 exposed in a spiral shape may be immersed in the developer 32.

  For example, when a positive type resist is used as the resist 2, the photosensitive portion is melted into a spiral shape by development, and a spiral space pattern 34 is obtained.

  In order to finish the development, the micropipe 1 in which the photosensitive portion is melted in a spiral shape and the spiral space pattern 34 is formed is immersed in a development rinse solution 35 as shown in FIG.

  Reference numeral 36 denotes a container for the developing rinse solution 35. Needless to say, it may be immersed instead of being immersed in the developing rinse solution 35.

  (H) shows a state in which the micropipe 1 in which the spiral space pattern 34 is formed is taken out from the developing rinse solution 35. Next, the micropipe 1 in which the spiral space pattern 34 is formed is (i) As shown in FIG.

  Reference numeral 38 denotes a container for the etching solution 37. Needless to say, it may be immersed instead of immersed.

  Heretofore, here, the micropipe 1 was immersed in the etching solution 37 until it became a microcoil.

  However, the etching rate varies slightly depending on variations in the state of the etching solution 37, for example, temperature, atmospheric pressure, lot of the developing solution, leaving time from the manufacturing date, leaving time after opening, the amount of liquid used, If the micropipe 1 is continuously etched until it becomes a microcoil, even if it is etched for the same time under the same apparent conditions, the etching amount varies, and the microcoil is overetched or cut, or the “flash” remains severely due to insufficient etching. I was doing.

  Therefore, in the present invention, in order to reduce the influence of variation in the etching amount when etching is performed for the same time under the same conditions as apparent, the micropipe 41 in the middle of etching is removed from the etching solution 37 before the micropipe 1 becomes a microcoil. As shown in (j), it is immersed in an etching rinse solution 39.

  Reference numeral 40 denotes a container for the etchant rinse solution 39. Needless to say, it may be immersed instead of immersed.

  (K) shows a state in which the micropipe 41 in the middle of etching is taken out from the development rinse 39.

  The micropipe 41 in the middle of etching is etched to a width B that is wider than the gap dimension of the spiral space pattern 34 before being put into the etching solution 37, that is, the line width b of the spiral space pattern 34. That is, it is undercut.

  The etching width W obtained by subtracting the line width b of the first spiral space pattern 34 from the groove width B on the surface of the etching groove formed in the micropipe 41 during the etching is W = B−b.

  In the present invention, before the micropipe 1 becomes a microcoil, the micropipe 41 in the middle of etching is removed from the etching solution 37 and rinsed, and then, as shown in FIG. The groove width B of the formed etching groove and the line width b of the spiral space pattern 34 are measured, the etching width W is obtained from the above formula W = B−b, and the etching width per unit etching time is calculated.

  Before the micropipe 1 becomes a microcoil, the process of taking out the micropipe 41 in the middle of etching from the etching solution 37 and rinsing it to obtain the etching width W is not limited to once, and it is better to repeat the process multiple times.

  FIG. 9 is an example of the relationship between the total etching time and the etching width W when the step of obtaining the etching width W is repeated a plurality of times.

  After forming a spiral space pattern having a space line width of about 20 μm and a pitch of 100 μm on a copper micropipe 1 having an outer diameter of 100 μm and an inner diameter of 40 μm with a positive resist PMER P-AR900 having a film thickness of about 3 μm, a 45 ° C. to 50 ° C. It is data when the process of immersing in a ferric aqueous solution, etching for 50 s and rinsing with 40 s pure water was repeated three times. The groove width B of the etching groove and the line width b of the spiral space pattern 34 are scanning electron. Measured by magnifying with a microscope.

  As shown in FIG. 9, since the etching width W changes linearly with respect to the total etching time, it is possible to accurately predict how much more etching is required to obtain the desired etching width W.

  Since etching proceeds substantially isotropically, the etching depth can also be predicted from W / 2.

  The etching depth may be directly measured by a stylus type step gauge, a laser displacement meter, or the like to determine the necessary etching time thereafter.

  In addition, when etching is performed in such a manner as to be divided in time, only the error of the etching width W in the last etching is generated, and this is effective for the error of the microcoil space and the wire width of the microcoil. The accuracy of the width can be increased.

  Furthermore, since the etching variation is averaged by performing the etching in time division, in some cases, the microcoil can be formed with the desired space width and wire width with good reproducibility without measuring the groove width B. Can be finished.

  For example, if the number of times of etching is increased, the microcoil can be finished to the desired space width and wire width with good reproducibility without measuring the groove width B.

  Further, when etching is performed three or more times by time division, it is efficient to measure the groove width B shown in FIG. 1 (k) only immediately before the completion of the microcoil.

  Returning to FIG. 1, if the necessary etching time is predicted from the micropipe 41 in the middle of etching as described above, the etching for that time is added, and the micropipe 41 in the middle of etching is added as shown in FIG. Is immersed in the etching solution 37 until it is completely microcoiled. Dipping may be used instead of dipping.

  In (l), reference numeral 42 denotes a micropipe that has been completely microcoiled after etching, that is, the microcoil of the present invention. To end the etching, as shown in FIG. Immerse in 39. Also in this case, it may be immersed instead of immersed.

  In (l) and (m), reference numeral 43 denotes a cross section of the microcoil of the present invention. According to the present invention, the “burr” 70 caused by the etching residue on the inner diameter side does not occur and is generally rectangular or trapezoidal. It becomes a shape.

  (N) shows a state where the microcoil 42 of the present invention is taken out from the etching rinse liquid 39 with the resist 2 attached after the etching is completed and rinsed.

  Next, in order to remove the resist 2, as shown in (o), the microcoil 42 with the resist 2 is dipped in a solvent or stripping solution that dissolves the resist 2 to remove the resist 2.

  The resist 2 may be removed by placing it in an apparatus that can dry-etch the resist 2 such as oxygen plasma.

  When the resist 2 is removed, the microcoil 42 of the present invention is finally obtained as shown in (p).

  The microcoil 42 that can be manufactured according to the present invention is formed when the spiral space pattern 34 is uniformly formed by lithography, and etching is performed in a time-divided manner for an appropriate time. Therefore, the microcoil 42 can be manufactured by the conventional method shown in FIG. The “burr” 70 is not generated.

  FIG. 2 shows another typical embodiment of the method of manufacturing the microcoil according to the present invention, and shows a space pattern of the resist 2 that is convenient when a plurality of microcoils 42 are manufactured from one micropipe 1. .

  FIG. 2A shows a space pattern of the resist 2 in a state corresponding to FIG. 1H, where 45 and 46 are spiral space patterns of portions to be microcoiled, and 47 and 48 are micropipes 1. It is a space pattern that goes around.

  When the pattern is formed in this manner, the micropipe 1 is divided into the microcoils 50 and 51 and the remaining part 52 of the micropipe at the space patterns 47 and 48 that circulate around the micropipe 1 by etching. Coils 50 and 51 are obtained simultaneously.

  Of course, the location where the micropipe 1 is divided and the number of divisions are arbitrary.

  FIG. 3 is a schematic view of a typical embodiment of the microcoil of the present invention, in which (a) is an embodiment in which the entire length is made into a microcoil, (b) is an embodiment in which one end is made into a microcoil, and (c) is an embodiment. In this embodiment, pipe portions are left at both ends, 53 is a microcoiled portion, and 54 and 55 are pipe portions.

  The microcoil in which the pipe portions are left at both ends shown in (c) can be manufactured by the microcoil manufacturing method of the present invention shown in FIG.

  Further, when forming the spiral space pattern 34 with the resist 2, if the space pattern is formed so as to circulate around the surface of the micropipe 1 at one or both ends of the spiral space pattern, FIG. ) And (l), the micropipe 1 is circularly etched to form a microcoil as shown in (b) or (a).

  Thus, according to the present invention, it is possible to make a microcoil in which the micropipe 1 is coiled in an arbitrary length range at an arbitrary portion.

  In (b), the pipe portions 54 and 55 left at both ends are drawn as if they are left-right symmetric, but the length of the microcoiled portion is arbitrary, and both left-right symmetric and left-right symmetric Also good.

  FIG. 4 is a schematic diagram of another embodiment of the microcoil according to the present invention, which is a microcoil in which the coil portion 53 has two strips 53a and 53b.

  In this way, when the coil portion is a double coil, it is possible to obtain a coil having a spring constant that is twice that of a normal single microcoil having the same outer diameter and the same lead.

  A coil part is good also as a multi-strip | triple coil of 3 or more.

  FIG. 4 shows only a schematic view of the embodiment corresponding to FIG. 3C in which the pipe portions 54 and 55 are left on both sides of the microcoil. However, it corresponds to FIG. 3A or 3B. Needless to say, the pipe portions 54 and 55 may hardly remain at one or both ends of the microcoil.

  FIG. 5 is a schematic diagram of another embodiment of the microcoil according to the present invention, and shows a microcoil in which a plurality of portions of the micropipe 1 are formed into a microcoil.

  56 and 57 are microcoiled portions, and 58 and 59 are pipe portions.

  In this way, if a microcoil in which a plurality of portions of the micropipe 1 are formed into a microcoil, the microcoil portion of each portion can be shortened to obtain a microcoil having the same spring constant, and therefore, it is difficult to break during manufacture, When used as a compression coil spring, buckling, bending and folding are less likely to occur.

  In FIG. 5, the pipe portions 58 and 59 left at both ends are drawn as if they are bilaterally symmetric, but the length and location of the microcoiled portions in a plurality of locations are arbitrary, and the micro The number of places to be coiled is also arbitrary.

  It is not always necessary to leave the pipe portions 58 and 59 at both ends, and one end or both ends of the micropipe 1 may be included in a plurality of locations where the microcoil is formed, and a micropattern is formed by forming a space pattern around the micropipe 1. The coiled portion may come to one end or both ends.

  FIG. 6 is a schematic view of still another microcoil embodiment of the present invention, showing a microcoil in which a plurality of portions 56 and 57 of the micropipe 1 are formed into a microcoil, and the winding direction is changed. Yes.

  In this way, if the plurality of locations 56 and 57 of the micropipe 1 are made into a microcoil and the direction of winding is changed almost in half, the microcoil portion of each location 56 and 57 can be shortened, so that it is difficult to break during production, In addition, when used as a compression coil spring, bending, bending, and folding are less likely to occur, and micro coil bending due to torsional stress in the coil part occurs in the opposite direction and cancels out. And bending is less likely to occur.

  In FIG. 6, the microcoiled portions 56 and 57 are provided in two places with the winding direction opposite to each other. However, the four windings are provided with two windings in the opposite direction, or the winding direction is arbitrarily reversed. It is also possible to make the sum of the number of turns of each turn the same.

  FIG. 7 is a schematic diagram of still another microcoil embodiment of the present invention, in which an arbitrary process such as a step or a taper is applied to the inner diameter side and / or outer diameter side of the end of the micropipe 1 where the microcoil is not formed. Microcoil.

  In FIG. 7, 60 is a microcoiled portion, 61 and 62 are pipe portions, (a) 63 is a step provided on the inner diameter side of the end of the non-microcoiled portion, and (b) 64 is a microcoiled portion. A step provided on the outer diameter side of the end of the portion not to be processed, and 65 in (c) is a taper provided on the outer diameter side of the end of the portion not to be microcoiled.

  The micropipe 1 is coiled after adding a step or taper to the inner diameter side and / or outer diameter side of the end of the non-microcoiled portion in advance by any method such as cutting, grinding, polishing, or plastic processing. Then, the microcoil of this embodiment is obtained.

  In this way, when a step or taper is provided on the inner diameter side and / or outer diameter side of the end of the portion that is not made into a microcoil, other parts such as, for example, a state in which the position of the microcoil and the axial center and the axial direction are aligned, for example, A tip of a probe can be attached.

  In addition, in order to attach a level | step difference or a taper to the inner diameter side and / or outer diameter side of the edge of the part which is not made into a microcoil, although it attached to only one side in the figure, it cannot be overemphasized that it may attach to both ends as needed.

  Further, in the microcoil of the present invention in which the pipe portion is left only at one end as shown in FIG. 3B, a step or taper is provided on the inner diameter side and / or outer diameter side of the end of the pipe portion that is not formed into the microcoil. Needless to say, it may be attached.

  FIG. 8 is a schematic view of still another microcoil embodiment of the present invention, which is a microcoil in which a through hole 67 is provided in a non-microcoiled portion 66 of the micropipe 1.

  With such a shape, when the microcoil of the present invention is used as a tension spring, it is possible to easily attach a tow rope such as a thread or a wire.

  If the outer diameter or inner diameter of the microcoil is small, it will be difficult to attach a pulling rope such as a thread or wire to the microcoil. However, according to the microcoil manufacturing method of the present invention, in the process of forming the spiral space pattern, If the hole pattern of the resist 2 having the shape of the through hole 67 is formed at a position where the through hole 67 is to be formed, the hole pattern portion of the resist 2 is formed in the process of forming the microcoil by etching the micropipe 1. The through hole can be made by etching at the same time. Reference numeral 68 denotes a microcoiled portion.

  The shape and size of the through-hole 67 are arbitrary, not necessarily circular, and the number is also arbitrary. The through hole 67 may be provided in both the pipe portions 66 and 69.

  1 to 8, only a few turns of the microcoiled portion are drawn, but this is because it is drawn as a schematic diagram, and the outer diameter, inner diameter, and length of the microcoil are also drawn as a schematic diagram. is there.

  FIG. 10 shows a method of manufacturing the microcoil according to the present invention shown in FIG. 1, wherein a blue solid laser having a wavelength of 473 nm is used as the laser 5 and the exposure beam 6 is irradiated at or near the exposure start point 4 as shown in FIG. The spot is adjusted, and the spot of the exposure beam 6 is adjusted at or near the exposure end point 26 as shown in (c), and the spot of the exposure beam 6 is at the top of the micropipe 1 at both positions. This is an example of measuring the line width of a spiral space pattern formed so as to have the expected shape and size.

  A spiral space pattern 34 with a pitch of 100 μm formed of a positive resist PMER P-AR900 having a film thickness of about 5 μm on a copper micropipe 1 having an outer diameter of 100 μm and an inner diameter of 40 μm could be uniformly formed with a space line width of about 11.5 μm. .

  Further, FIG. 11 shows a case of using a spiral space pattern 16 having a pitch of 100 μm formed of a positive resist PMER P-AR900 having a film thickness of about 3 μm on a copper micropipe 1 having an outer diameter of 80 μm and an inner diameter of 30 μm. It is the microscope picture of a 5 mm long microcoil obtained by repeating the process of immersing in ferric aqueous solution, performing etching for 50 s, and rinsing with 40 s pure water three times.

  Since the microcoil is straight and has a length of 5 mm with respect to an outer diameter of 80 μm, the coil length / coil diameter = aspect ratio is 60 or more.

  FIG. 12 shows the measurement results of the strand wire width of the microcoil shown in FIG. 10, and the variation in the strand wire width is ± 10% or less over the entire length. According to the present invention, it can be seen that the microcoil can be manufactured with a uniform wire width.

  FIG. 13 is a micrograph of a partially enlarged microcoil according to the present invention. The strands of the microcoil are processed with high accuracy, and if the appropriate etching of the present invention is performed, the “burr” 70 as shown in FIG. It can be seen that the side of the line is smooth.

  As another embodiment, a spiral space pattern 34 having a pitch of 85 μm formed by attaching a positive resist PMER P-AR900 having a film thickness of about 5 μm to a copper micropipe 1 having an outer diameter of 100 μm and an inner diameter of 40 μm is used. The process of immersing in a ferric chloride aqueous solution at -50 ° C., etching for 50 s and rinsing with 40 s pure water was repeated three times to obtain a microcoil having a length of 5 mm.

  According to the conventional microcoil manufacturing method shown in FIG. 14, when the microcoil is manufactured from the same copper micropipes 1, the pitch of the spiral space pattern 34 is limited to 100 μm, and if the pitch is smaller than that, the microcoil is etched during etching. Before the coil was completed, it was cut somewhere.

  According to the conventional microcoil manufacturing method, when a microcoil is manufactured from the same copper micropipe 1, the pitch can be 100 μm, and even if the “flash” 70 remains, the length that can be coiled is at most several turns. The coil length / coil diameter = aspect ratio is limited to 5-6 at most, but according to the present invention, as described above, a microcoil having a length of 5 mm can be manufactured even at a pitch of 85 μm. Since the length was 5 mm with respect to the outer diameter of 100 μm, the coil length / coil diameter = the aspect ratio was 50.

  As described above, according to the method for manufacturing a microcoil of the present invention, the wire width of the coil is uniform and the coil length / coil diameter = the aspect ratio can be 20 or more, which is much larger than the conventional one.

  Further, even when a microcoil having a thicker outer diameter ratio and a thicker value than the conventional one can be manufactured and the coil length / coil diameter = the aspect ratio is 20 or more, as is clear from the examples, (100-40) / 2 = 30 μm thick.

  The coil spring becomes soft when the length is increased, and becomes hard when the thickness is increased. Therefore, since the microcoil of the present invention can have a large aspect ratio, the length can be increased with respect to the same outer diameter and inner diameter, and the wall thickness can be increased, so that the microcoil can be soft or hard and used as a spring. Thus, a much wider range of spring constants and spring displacement strokes than in the prior art can be obtained.

  In addition, since variations among spring constants and displacement strokes are small, it can be used for applications that require a large number of microcoils having the same characteristics.

  For example, in a probe probe for inspecting an integrated circuit, a microcoil is arranged in a cylindrical guide, and the probe is pressed against an electrode by the microcoil, and is pressed by the spring constant and displacement of the microcoil. The power is determined.

  Since a large number of probe probes are used side by side in a matrix, it is necessary that the characteristics of the springs are uniform and there is little variation, and it is very effective if the microcoil of the present invention is used.

  On the other hand, the wire side surface of the microcoil formed by etching has no “burrs” and is smooth, and therefore, when used as a component of an inductance element component or a micro electromagnetic coil, a discharge or a short circuit hardly occurs.

  In addition, since the pitch can be made higher and finer than before, the wire width can be reduced, and the coil length / coil diameter = aspect ratio can be increased, so that a coil with a large number of turns can be manufactured and the inductance can be reduced for a small outer diameter. Large microcoils can be obtained.

Manufacturing method of microcoil of the present invention Explanatory drawing of another microcoil manufacturing method of this invention Schematic diagram of a typical embodiment of a microcoil of the present invention Schematic of another microcoil embodiment of the present invention Schematic of yet another microcoil embodiment of the present invention. Schematic of yet another microcoil embodiment of the present invention. Schematic of yet another microcoil embodiment of the present invention. Schematic of yet another microcoil embodiment of the present invention. Example of relationship between total etching time and etching width W according to the present invention Measurement example of line width of spiral space pattern formed according to the present invention Micrograph of the microcoil of the present invention Measurement result of the wire width of the microcoil of the present invention Micrograph of a partially enlarged microcoil having no “burr” of the present invention Explanatory drawing of the conventional microcoil manufacturing method disclosed by the nonpatent literature 1. "Burr" caused by the conventional microcoil manufacturing method

Explanation of symbols

1: Micropipe 2: Resist 3: Chuck 4: Exposure start point 5: Laser 6: Exposure beam 7: Camera 8: Spot image of exposure beam 9: Television monitor 10: X stage 11: Y stage 12: Z stage 13 : Beam splitter 14: Lens 17: Neutral filter 18: Shutter 19: Pinhole 20: X rotation stage 21: Tilt / height adjustment stage 22: Direction rotation stage 23: Illumination light source 24: Beam splitter 26: Exposure end point 31 : Photosensitive part 32 by exposure: Developer 34: Spiral space pattern 35: Development rinse 37: Etching liquid 39: Etching rinse 41: Micropipe 42 in the middle of etching 42: Microcoil 45: Spiral space pattern 46: Spiral Space pattern 47: Space putter around the micropipe 48: Space pattern around the micropipe 50: Microcoil 51: Microcoil 53: Microcoiled part 54: Pipe part 55: Pipe part 56: Microcoiled part 57: Microcoiled part 58: Pipe part 59: Pipe Portion 60: Microcoiled portion 61: Pipe portion 62: Pipe portion 63: Step provided on the inner diameter side of the portion not to be microcoiled 64: Step 65 provided on the outer diameter side of the end of the portion not to be microcoiled: Taper 67 provided on the outer diameter side of the end of the non-coiled portion: through hole 70: flash

Claims (11)

  A resist coating step for applying a resist to the outer surface of a metallic micropipe having an outer diameter of 100 μm or less, and an exposure beam spot on at least two or more points on or near the planned exposure position on the resist film. When the exposure beam spot comes in any position, the exposure beam spot position, shape, and size should be within an allowable error range for the intended position, shape, and size. Adjusting the relative tilt angle between the micropipe and the exposure beam and / or adjusting the position of the micropipe in the exposure beam irradiation direction, and adjusting the exposure beam spot to a light intensity at which the resist is exposed. Is exposed in a spiral manner at a single location or at multiple locations over a length section that is 20 times or more the outer diameter of the micropipe. An exposure step; and a development step of forming a spiral space pattern of the resist by immersing and / or infiltrating the micropipes having the resist that is spirally exposed by the spiral exposure in a developer. The micropipes having the spiral space pattern of the resist formed through the steps are immersed and / or immersed in an etching solution, and the micropipes exposed as the bottom of the spiral space pattern are screwed using the resist as an etching mask. Etching into a linear shape, and at least once before the etching is completed, the micropipe is once taken out of the etching solution and immersed in and / or poured into a rinsing solution to perform washing to remove the etching solution, After removing the rinsing liquid, the micropipe is again immersed in the etching liquid and The micropipes exposed as the bottom of the spiral space pattern using the resist as an etching mask by immersion are further etched into a spiral shape, and the etching and the rinse are appropriately performed until the micropipes become microcoils. A method of manufacturing a microcoil comprising: a step of repeatedly etching; and a microcoil having a value obtained by dividing the length of the coiled portion by the outer diameter is 20 or more   The etching step of the microcoil manufacturing method according to claim 1 is carried out at least once before the etching is completed, and the micropipe having the spiral space pattern of the resist is once taken out from the etching solution, immersed in a rinsing solution, and After the step of rinsing to remove the etching solution by immersing the substrate and removing the rinse solution, it is necessary to perform additional etching by measuring the width and / or depth of the spiral groove of the extracted micropipe. A method for producing a microcoil, characterized in that a process for predicting time is provided, and an etching process for further etching is performed after predicting the time required for etching.   3. The microcoil manufacturing method according to claim 1 or 2, wherein, in addition to forming a plurality of spiral space patterns in an exposure step of exposing the resist in a spiral manner and a subsequent developing step, the micropipes are circulated. Forming a space pattern, and etching the micropipes using the resist as a masking material, and cutting the micropipes by etching the space pattern portions around the micropipes to obtain a plurality of microcoils. Micro coil manufacturing method   A microcoil obtained by etching a metal micropipe having an outer diameter of 100 μm or less into a spiral by only one portion being spirally etched, and the value obtained by dividing the length of the coiled portion by the outer diameter is 20 or more. Micro coil   In a microcoil obtained by etching a metal micropipe having an outer diameter of 100 μm or less in a spiral shape at a plurality of locations into a coil, a value obtained by dividing the total length of the coiled portion by the outer diameter is 20 or more. Micro coil characterized by   6. A microcoil according to claim 4 and claim 5, wherein the coiled portion is a multi-threaded spiral having two or more threads.   6. The microcoil according to claim 5, wherein the winding direction of the spiral portion of the plurality of portions etched into a spiral shape is reversed by about half.   8. The microcoil according to claim 4, wherein both ends of the metal pipe are coiled portions.   8. The microcoil according to claim 4, wherein one end or both ends of the metal micropipes are formed into micropipes without being coiled.   10. The microcoil according to claim 9, wherein a step process or a taper process is performed on an outer diameter side and / or an inner diameter side of one end or both ends of the metal micropipe portion left without being coiled at one end or both ends. Micro coil   11. The microcoil according to claim 9, wherein a through hole is provided in the metal micropipe portion left without being coiled at one end or both ends.

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