JP2016141029A - Scribe device and holder unit - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a scribe device which can stabilize a formation position of a scribe line and prevent occurrence of shifting thereof from a desired position in order to solve the problem such that the formation position of the scribe line is shifted due to movement of a scribing wheel in a pin shaft direction, and a holder unit.SOLUTION: A scribe device 1 is so configured that pin holes 64a, 64b formed on holding parts 62a, 62b of a holder 60 are formed at positions different from each other along a direction R of travel, and a pin shaft 50 is so located as to be inclined with respect to a direction B orthogonal to the direction R of travel on a horizontal plane H. Thus, when a scribe line is formed, a side face 42a of a scribing wheel 40 is so moved as to approach a holding wall 65a and is brought into contact with the holding wall, and therefore, movement thereof along the pin shaft 50 is regulated.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a scribing device and a holder unit used when forming a scribe line on the surface of a brittle material substrate in dividing a brittle material substrate such as a glass substrate.

  When a brittle material substrate such as a glass substrate is divided into desired dimensions, a scribing device is generally used. This scribing device is used by attaching the scribing wheel to a holder for holding the scribing wheel. In addition, this scribing wheel has a cylindrical pin shaft inserted into a pin hole formed in a holder holding part and a through hole formed in a side surface of the scribing wheel, so that the holding part (holding groove) Retained.

  The scribing wheel attached to the holder is rotatably held, and proceeds while rotating on the surface of the brittle material substrate, thereby forming a scribe line in the brittle material substrate. An example of such a scribing device is a scribing device described in Patent Document 1.

International Patent Publication No. WO2007 / 063979

  The scribing wheel attached to the holder needs to rotate in the holding groove in order to form a scribe line as described above. Therefore, the width of the holding groove is slightly larger than the thickness of the scribing wheel, and a clearance is secured between the scribing wheel and the holding portion. Specifically, when the thickness of the scribing wheel is 0.65 mm, the width of the holding groove is increased by about 0.02 mm. As described above, the clearance exists between the scribing wheel and the holding portion, so that the scribing wheel is rotatably held.

  On the other hand, this clearance allows the scribing wheel to move about 0.02 mm along the pin axis within the holder groove. Therefore, when the scribe line is formed, the scribing wheel moves in the pin axis direction, so that the formation position of the scribe line becomes unstable, and in the conventional scribe device, the scribe line is shifted from a desired position. Was a problem.

  The present invention has been made in view of the problem that the formation position of the scribe line is shifted due to the movement of the above-described scribing wheel in the pin axis direction, and the formation position of the scribe line is stabilized to a desired position. An object of the present invention is to provide a scribing device and a holder unit that prevent deviation from the above.

  In order to achieve the above object, the scribing device of the present invention includes a scribing wheel, a pin shaft penetrating through a through hole of the scribing wheel, a main body, and a lower side of the main body that holds the scribing wheel. A holder unit comprising: a holder having a pair of holding portions; and a pin hole formed in each of the holding portions and through which the pin shaft is inserted; and the holder centering on a rotating shaft extending in a vertical direction A scribing device including a scribing head that rotatably holds the unit, wherein the pin shaft is disposed in a horizontal plane so as to be inclined from a direction orthogonal to a traveling direction of the scribing wheel.

  According to the scribing device of the present invention, since the pin shaft is arranged to be inclined from the direction orthogonal to the traveling direction, when the scribe line is formed, the scribing wheel approaches one holding part side. For this reason, the scribing wheel is restricted from moving in the pin axis direction by the clearance between the scribing wheel and the holding portion. Therefore, the scribe device can stabilize the formation position of the scribe line.

  The scribing apparatus of the present invention is characterized in that the pin holes are formed at different positions along the traveling direction in a horizontal plane.

  According to the scribing device of the present invention, the above-described effect can be achieved by simply adjusting the formation position of the pin hole of the holder.

  Moreover, the scribing device of the present invention is characterized in that a holding groove formed between the pair of holding portions is inclined so as to be orthogonal to the pin axis.

  According to the scribing device of the present invention, since the contact area between the scribing wheel and the holding portion increases when the scribing wheel approaches one holding portion, wear on the side surface of the scribing wheel can be suppressed.

  The scribing apparatus of the present invention is characterized in that the scribing head includes holder unit tilting means for tilting the pin shaft from a direction perpendicular to the traveling direction of the scribing wheel on a horizontal plane.

  According to the scribing apparatus of the present invention, since the scribing head includes the holder unit tilting means, it is not necessary to perform special processing for tilting the pin shaft on the holder unit itself. Therefore, the scribing device can achieve the above effect using a commonly used holder unit.

  In the scribing apparatus of the present invention, the scribing head includes a holder joint to which the rotating shaft is attached, and the holder unit tilting means is formed in the holder joint.

  According to the scribing apparatus of the present invention, the present invention can also be applied to a scribing apparatus having a configuration in which the holder unit is attached to the scribing head via the holder joint.

  The scribing apparatus of the present invention is characterized in that the holder joint includes a vertical wall, and the holder unit tilting means is a tilting member disposed between the vertical wall and the holder. The scribing device of the present invention is characterized in that the holder unit tilting means is a spring member disposed between the holder joint and the holder. The scribing apparatus of the present invention is characterized in that the holder unit tilting means is a magnet attached to the holder joint.

  According to the scribing apparatus of the present invention, it is possible to employ holder unit tilting means suitable for the scribing apparatus.

  The holder unit of the present invention includes a scribing wheel, a pin shaft penetrating through the through hole of the scribing wheel, a main body portion, and a pair of holding portions that are formed below the main body portion and hold the scribing wheel. And holders each having a pin hole formed in the holding portion and through which the pin shaft is inserted, wherein the pin holes are different from each other along the traveling direction in a horizontal plane. The pin shaft is formed at a position, and is inclined from a direction orthogonal to the traveling direction of the scribing wheel on a horizontal plane.

  By forming the scribe line by the scribe device using the holder unit of the present invention, the pin shaft is arranged inclined from the direction orthogonal to the traveling direction, so that the scribing wheel approaches one holding part side. Become. For this reason, the scribing wheel is restricted from moving in the pin axis direction by the clearance between the scribing wheel and the holding portion.

  Further, the holder unit of the present invention is characterized in that a holding groove formed between the pair of holding portions is inclined so as to be orthogonal to the pin shaft.

  According to the holder unit of the present invention, since the contact area between the scribing wheel and the holding portion increases when the scribing wheel approaches one holding portion, wear on the side surface of the scribing wheel can be suppressed.

1 is a schematic diagram of a scribing apparatus according to Embodiment 1. FIG. 2A is a front view of the holder unit according to the first embodiment, FIG. 2B is a side view of the holder unit, and FIG. 2C is a conceptual diagram of the holder unit as viewed from above. It is a conceptual diagram in the upper view of the holder unit of Embodiment 2. It is a conceptual diagram in the upper view of the holder unit of Embodiment 3. FIG. 5A is a side view of the holder unit according to the fourth embodiment, and FIG. 5B is a conceptual diagram of the holder unit as viewed from above. FIG. 6A is a side view of the holder unit according to the fifth embodiment, and FIG. 6B is a conceptual diagram of the holder unit as viewed from above.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. However, the embodiment shown below shows an example for embodying the technical idea of the present invention, and is not intended to specify the present invention to this embodiment. The present invention is also applicable to other embodiments within the scope of the claims.

[Embodiment 1]
FIG. 1 is a schematic view of a scribing apparatus 1 according to an embodiment of the present invention. The scribing apparatus 1 includes a moving table 10. The moving table 10 is screwed with a ball screw 11 and is movable in the y-axis direction along the pair of guide rails 12 by rotating the ball screw 11 by driving a motor.

  A motor 13 is installed on the upper surface of the movable table 10. The motor 13 rotates the table 14 positioned at the upper part on the xy plane and positions it at a predetermined angle. The table 14 that can be rotated horizontally by the motor 13 includes vacuum suction means (not shown), and holds the brittle material substrate 15 placed on the table 14 by the vacuum suction means.

  The brittle material substrate 15 is a glass substrate, a ceramic substrate made of low-temperature fired ceramics or high-temperature fired ceramics, a silicon substrate, a compound semiconductor substrate, a sapphire substrate, a quartz substrate, or the like. Further, the brittle material substrate 15 may be one in which a thin film or a semiconductor material is attached to or included in the surface or inside of the substrate. The brittle material substrate 15 may have a thin film or the like not corresponding to the brittle material attached to the surface thereof.

  The scribing apparatus 1 includes two CCD cameras 16 that image alignment marks formed on the surface of the brittle material substrate 15 above the brittle material substrate 15 placed on the table 14. A bridge 17 is installed on the columns 18a and 18b so as to straddle the movable table 10 and the table 14 on the upper side thereof.

  A guide 19 is attached to the bridge 17, and the scribe head 20 is installed so as to move in the x-axis direction while being guided by the guide 19. The scribe head 20 includes a holder joint 21 at the lower end. A holder unit 30 in which a scribing wheel 40 is held by a holder 60 is attached to the scribe head 20 via a holder joint 21.

  Here, an outline of a process of forming a scribe line on the brittle material substrate 15 using the scribe device 1 will be described. First, the scribing wheel 40 is attached to the holder 60 attached to the scribe head 20. The scribing apparatus 1 positions the brittle material substrate 15 with a pair of CCD cameras 16. Next, the scribing apparatus 1 moves the scribing head 20 to a predetermined position, applies a predetermined load to the scribing wheel 40, and contacts the brittle material substrate 15. Then, the scribe device 1 forms a predetermined scribe line on the surface of the brittle material substrate 15 by moving the scribe head 20 in the X-axis direction. The scribing device 1 rotates the table 14 or moves in the Y-axis direction as necessary to form a scribe line in the same manner as described above.

  Next, details of the holder unit 30 will be described with reference to the drawings. 2A is a front view showing the holder unit 30 in a horizontal direction, FIG. 2B is a side view of the holder unit 30, and FIG. 2C is indicated by an arrow A in FIG. 2B. It is a key map of holder unit 30 in the upper view. 2A and 2B also show the holder joint 21 to which the holder unit 30 is directly attached. FIG. 2C is a conceptual diagram for showing the orientation of the pin shaft 50 in the horizontal plane H to be described later, and a part of the holder unit 30 is not shown.

  The holder unit 30 is a unit in which a scribing wheel 40, a pin shaft 50, and a holder 60 are integrated. The holder unit 30 is attached to the holder joint 21 with attachment screws 31 as shown in FIG.

  Here, the holder joint 21 includes a vertical wall 22a and a horizontal wall 22b, and a mounting portion 22 having an inverted L-shaped cross section, and a rotary shaft 23 extending vertically from the top surface side of the horizontal wall 22b of the mounting portion 22. And two bearings 24a and 24b through which the rotary shaft 23 is inserted.

  In the holder unit 30 attached to the holder joint 21, the side surface of the holder unit 30 is in contact with the vertical wall 22a of the attachment portion 22, and the upper surface of the holder unit 30 is in contact with the horizontal wall 22b. Further, as shown in FIG. 2A, a screw hole 25 into which the mounting screw 31 is inserted is formed in the vertical wall 22a.

  The holder joint 21 is fixed to the inside of the scribe head 20 so that the holder unit 30 attached to the attachment portion 22 is exposed from the scribe head 20. At this time, the holder unit 30 fixed to the holder joint 21 is rotatable about the rotation shaft 23. The alternate long and short dash line S indicates the axis center of the rotating shaft 23. A broken line H in FIG. 2A indicates a horizontal plane orthogonal to the rotation axis 23, and the horizontal plane H is a plane parallel to the surface of the brittle material substrate 15.

  Further, when a scribe line is formed on the surface of the brittle material substrate 15 using the scribe device 1, the scribing wheel 40 rotates so as to proceed in the direction of the arrow R shown in FIG. The scribing device 1 may be configured so that the holder unit 30 itself includes the rotating shaft 23 and the bearings 24a and 24b without using the holder joint 21.

  The scribing wheel 40 is a disk-shaped member made of, for example, sintered diamond or cemented carbide. The scribing wheel 40 has a through hole 41 through which the pin shaft 50 penetrates at the center of both side surfaces 42a and 42b of the disk. Further, the scribing wheel 40 has a V-shaped blade that forms a ridge line on the outer peripheral portion. Further, the scribing wheel 40 of this embodiment has a thickness of about 0.65 mm, an outer diameter of about 2.0 mm, a diameter of the through hole 41 of about 0.8 mm, and a blade edge angle of about 130 °. .

  The pin shaft 50 is a columnar member formed of, for example, sintered diamond or cemented carbide, and has a pointed head 51 with one end. Further, the diameter of the pin shaft 50 of this embodiment is about 0.8 mm.

  The holder 60 includes a main body 61 made of stainless steel or carbon tool steel. As shown in FIG. 2 (B), the main body 61 has a trapezoidal shape whose width is narrowed toward the lower end in a side view. In addition, holding portions 62a and 62b are formed in the trapezoidal portion of the main body portion 61, and a holding groove 63 is formed between the holding portions 62a and 62b. In addition, although the holder 60 comprises the main body part 61 with one base material, for example, the main body part 61 may be formed by fixing two base materials each having the holding parts 62a and 62b.

  Pin holes 64a and 64b through which the pin shaft 50 is inserted are formed in the holding portions 62a and 62b. Details of the positions where the pin holes 64a and 64b are formed will be described later. The side surface 42a of the scribing wheel 40 faces the holding portion 62a, and the side surface 42b faces the holding portion 62b. The facing surface of the holding portion 62a facing the side surface 42a becomes a holding wall 65a, and the facing surface of the holding portion 62b facing the side surface 42b becomes a holding wall 65b.

  A screw hole 66 into which the mounting screw 31 is inserted is formed in the upper part of the main body 61. Further, a stopper 68a is attached to the holding portion 62a side with a screw 69a, and a stopper 68b is attached to the holding portion 62b side with a screw 69b. The stoppers 68a and 68b are for closing the pin holes 64a and 64b.

  The scribing device 1 as described above includes a scribing wheel 40, a pin shaft 50 that passes through the through-hole 41 of the scribing wheel 40, and pin holes 64 a provided in holding parts 62 a and 62 b on the lower side of the main body 61. A holder unit 30 including a holder 60 having a pin shaft 50 inserted through 64b, a holder joint 21 that rotatably holds the holder unit 30 around the rotating shaft 23 and is fixed to the inside of the scribe head 20, It has.

  In addition, the scribing device 1 has a pin shaft 50 that is inclined with respect to a direction B perpendicular to the traveling direction R on the horizontal plane H as shown in FIG. Specifically, pin holes 64a and 64b formed in the holding portions 62a and 62b of the holder 60 are generally formed so as to face the same position along the traveling direction R. In the embodiment, as shown in FIG. 2 (C), they are formed at different positions along the traveling direction R.

  Accordingly, the pin shaft 50 inserted through the pin holes 64a and 64b is disposed to be inclined with respect to the direction B orthogonal to the traveling direction R.

  Then, when a scribe line is formed on the surface of the brittle material substrate 15 using such a scribing apparatus 1, the side surface 42a side of the scribing wheel 40 moves in a direction approaching the holding wall 65a due to a reaction force received from the brittle material substrate 15. , Contact the holding wall 65a.

  For this reason, the clearance between the side surface 42a of the scribing wheel 40 and the holding wall 65a becomes zero. Therefore, the scribing wheel 40 is restricted from moving along the pin shaft 50 when forming a scribe line. The scribing apparatus 1 can stabilize the formation position of the scribe line, and can form the scribe line at a desired position.

[Embodiment 2]
Next, another embodiment will be described with reference to the drawings. FIG. 3 is a conceptual diagram of the holder unit 130 as viewed from above. In addition, about the same structure of the holder unit 30 of Embodiment 1, description is abbreviate | omitted with a code | symbol.

  In the holder unit 30 according to the first embodiment, only the pin shaft 50 located in the holding groove 63 is arranged to be inclined with respect to the direction B orthogonal to the traveling direction R. On the other hand, the holder unit 130 of the present embodiment is formed such that the holding groove 163 is inclined in accordance with the inclination of the pin shaft 150.

  When a scribe line is formed using the scribing apparatus 1 including such a holder unit 130, when the side surface 142a side of the scribing wheel 140 moves in a direction approaching the holding wall 165a, the side surface 142a side of the scribing wheel 140 and the holding wall 165a. Will increase the contact area. Further, by adjusting the inclination angle of the holding groove 163 to the angle between the side surface of the scribing wheel 140 and the traveling direction R, the side surface 142a side of the scribing wheel 140 and the holding wall 165a come into surface contact.

  Therefore, the wear of the side surface 142a of the scribing wheel 140 and the holding wall 165a of the holding portion 162a proceeds uniformly, and the frequency of parts replacement can be suppressed. In addition,

[Embodiment 3]
Next, another embodiment will be described with reference to the drawings. FIG. 4 is a conceptual diagram of the holder unit 230 attached to the holder joint 221 in a top view. In addition, about the structure similar to Embodiment 1, description is abbreviate | omitted with a code | symbol.

  The scribing apparatus 1 according to the present embodiment is configured such that the holder joint 221 includes holder unit tilting means in order to dispose the pin shaft 250 with respect to the direction B perpendicular to the traveling direction R in the horizontal plane H.

  Specifically, the holder unit tilting means is a tilting member 280 fixedly disposed between the vertical wall 222 a of the holder joint 221 and the holder unit 230.

  The inclined member 280 is made of a metal member and is a triangular member whose width gradually decreases from the front to the rear in the traveling direction R as shown in FIG.

  The inclined member 280 is disposed between the side surface of the main body portion 261 on the holding portion 262b side and the vertical wall 222a, and is disposed above the screw 269b in a front view so as not to contact the clasp 268b and the screw 269b. Yes. Further, the inclined member 280 is formed with a screw hole (not shown), and is fixed by an attaching screw (not shown) for attaching the holder 260 to the vertical wall 222a.

  As described above, since the holder joint 221 includes the holder unit tilting means, it is not necessary to perform processing for tilting the pin shaft 250 on the holder unit 230 itself, so that the general holder unit 230 is used as it is. Can do.

[Embodiment 4]
Next, another embodiment will be described with reference to the drawings. FIG. 5A is a side view of the holder unit 330 attached to the holder joint 321, and FIG. 5B is a conceptual diagram of the holder unit 330 in a top view.

  In the scribing apparatus 1 according to the present embodiment, the holder joint 321 includes a holder unit tilting unit as in the third embodiment.

  On the other hand, the holder unit tilting means of the present embodiment is a spring member 380 disposed between the holder joint 321 and the holder unit 330. Specifically, the spring member 380 has end portions on a hook portion 381a provided in front of the horizontal wall 322b of the holder joint 321 and a hook portion 381b provided in front of the main body portion 361 of the holder 360, respectively. It is arranged by hooking. The hook portions 381a and 381b are provided so as to be slightly removed from the same line along the traveling direction R.

  Therefore, the holder unit 330 is slightly tilted by the elastic force of the spring member 380 as shown in FIG. By tilting the holder unit 330, the pin shaft 350 is also tilted with respect to the direction B orthogonal to the traveling direction R.

  Then, when a scribe line is formed on the surface of the brittle material substrate 15 using the scribe device 1, the side surface 342a side of the scribing wheel 340 moves in a direction approaching the holding wall 365a and contacts the holding wall 365a. For this reason, the scribing wheel 340 has zero clearance between the side surface 342a and the holding wall 365a, and is restricted from moving along the pin shaft 350 when forming a scribe line.

[Embodiment 5]
Next, another embodiment will be described with reference to the drawings. 6A is a side view of the holder unit 430 attached to the holder joint 421, and FIG. 6B is a conceptual diagram of the holder unit 430 in a top view.

  The scribing apparatus 1 according to the present embodiment is configured such that the holder joint 421 includes holder unit tilting means as in the third and fourth embodiments.

  On the other hand, the holder unit tilting means of the present embodiment is a magnet 480 attached to the holder joint 421. Specifically, the magnet 480 is attached to a fixing portion 481a provided in front of the horizontal wall 422b of the holder joint 421.

  In the present embodiment, the main body 461 of the holder 460 is formed of a nonmagnetic material such as austenitic stainless steel. A magnet 481 b is built in front of the main body 461 of the holder 460.

  Therefore, the magnet 481b included in the holder unit 430 is attracted to the magnet 480, and the holder unit 430 is slightly tilted as shown in FIG. 6B. When the holder unit 430 is inclined, the pin shaft 450 is also inclined with respect to the direction B orthogonal to the traveling direction R.

  Then, when a scribe line is formed on the surface of the brittle material substrate 15 using the scribing apparatus 1, the side surface 442a side of the scribing wheel 440 moves in a direction approaching the holding wall 465a and contacts the holding wall 465a. For this reason, the scribing wheel 440 has zero clearance between the side surface 442a and the holding wall 465a, and is restricted from moving along the pin shaft 450 when forming a scribe line.

  In addition, since the scribing device 1 includes the holder unit tilting means as in the third to fifth embodiments, it is not necessary to perform a process of tilting the pin shaft on the holder unit itself. It can be used almost as it is. In the third to fifth embodiments, the holder joint is provided with the holder unit tilting means. However, for example, when the scribing apparatus 1 is not provided with the holder joint, the holder unit tilting means is provided on the scribe head. It is also possible to provide a configuration.

DESCRIPTION OF SYMBOLS 1 ... Scribe device 10 ... Moving stand 11 ... Ball screw 12 ... Guide rail 13 ... Motor 14 ... Table 15 ... Brittle material board 16 ... CCD camera 17 ... Bridge 18a, 18b ... Support column 19 ... Guide 20 ... Scribe head 21,221,321 , 421 ... Holder joint 22 ... Mounting portion 22a ... Vertical wall 22b ... Horizontal wall 23 ... Rotating shaft 24a, 24b ... Bearing 25 ... Screw hole 30, 130, 230, 330, 430 ... Holder unit 31, 131 ... Mounting screw 40, 140, 340, 440 ... scribing wheel 41 ... through hole 42a, 42b, 142a, 342a, 442a ... side surface 50, 150, 250, 350, 450 ... pin shaft 51 ... pointed head 60, 160, 260, 360, 460 ... Holder 61, 261, 361, 461 ... book Part 62a, 62b, 162a, 262b ... Holding part 63, 163 ... Holding groove 64a, 64b ... Pin hole 65a, 65b, 165a, 365a, 465a ... Holding wall 66 ... Screw hole 68a, 68b, 268b ... Clasp 69a, 69b 269b ... Screw 280 ... Inclined member 380 ... Spring member 381a, 381b ... Hook 480, 481b ... Magnet 481a ... Fixed part

Claims (10)

A scribing wheel,
A pin shaft penetrating through the through hole of the scribing wheel;
A holder having a main body part, a pair of holding parts formed on the lower side of the main body part to hold the scribing wheel, and a pin hole formed in the holding part and through which the pin shaft is inserted; A holder unit comprising:
A scribe head that rotatably holds the holder unit around a rotation axis extending in a vertical direction;
A scribing device comprising:
The scribing apparatus, wherein the pin shaft is disposed to be inclined from a direction orthogonal to a traveling direction of the scribing wheel on a horizontal plane.   The scribing device according to claim 1, wherein the pin holes are formed at different positions along the traveling direction in a horizontal plane.   The scribing device according to claim 1, wherein a holding groove formed between the pair of holding portions is formed to be inclined so as to be orthogonal to the pin axis.   The scribing apparatus according to claim 1, wherein the scribing head includes holder unit tilting means for tilting the pin shaft from a direction perpendicular to the traveling direction of the scribing wheel on a horizontal plane. The scribe head includes a holder joint to which the rotating shaft is attached;
The scribing apparatus according to claim 4, wherein the holder unit tilting means is formed on the holder joint. The holder joint comprises a vertical wall;
The scribing apparatus according to claim 5, wherein the holder unit tilting means is a tilting member disposed between the vertical wall and the holder.   The scribing apparatus according to claim 5, wherein the holder unit tilting means is a spring member disposed between the holder joint and the holder.   The scribing apparatus according to claim 5, wherein the holder unit tilting means is a magnet attached to the holder joint. A scribing wheel,
A pin shaft penetrating through the through hole of the scribing wheel;
A holder having a main body part, a pair of holding parts formed on the lower side of the main body part to hold the scribing wheel, and a pin hole formed in the holding part and through which the pin shaft is inserted;
A holder unit comprising:
The pin holes are formed at different positions along the traveling direction in a horizontal plane,
The holder unit according to claim 1, wherein the pin shaft is inclined from a direction orthogonal to a traveling direction of the scribing wheel on a horizontal plane.   The holder unit according to claim 9, wherein a holding groove formed between the pair of holding portions is formed to be inclined so as to be orthogonal to the pin axis.

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