JP2009198603A - Optical terminating device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an optical terminating device having an excess length storing section inside to store an excess length of an optical fiber, the optical terminating device facilitating connection of optical fibers and treatment of an excess length of optical fibers. <P>SOLUTION: The optical terminating device includes a lower casing 11, an upper casing 12 detachably attached to the lower casing 11, a circuit board 13, and a base member 14 which is disposed in an inner space formed by lower casing 11 and the upper casing 12, is formed with an external optical fiber winding section 37 for storing an excess length of an external optical fiber 15 and allows an optical interface connector 42 to be mounted thereto. The external optical fiber winding section 37 is formed on the surface 35 of the base member 14 opposing to the upper casing 12, while the circuit board 13 is fixed to the back face 37 of the base member 14 opposing to the lower casing 11. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

The present invention relates to an optical terminator, and more particularly, to an optical terminator having an extra length accommodating portion for accommodating an extra length portion of an optical fiber therein.
About.

  In recent years, the speed of Internet communication has been increased, and Internet communication using light instead of a telephone line or an ISDN line has been performed. When using the Internet connection service using this optical fiber, the optical fiber is drawn into the house from the outside, and an optical terminator (ONU) is connected to this optical fiber. A configuration is adopted in which a LAN or a personal computer (hereinafter abbreviated as a PC) is connected by an Ethernet (registered trademark) system.

  This optical termination device has a function of converting optical / electrical signals and multiplexing / demultiplexing optical signals. That is, the optical terminator has a function of changing an optical signal flowing through the optical fiber into an electric signal and changing an electric signal sent out to the optical fiber into an optical signal.

  Therefore, when using an Internet connection service using an optical fiber, it is necessary to connect the optical fiber drawn into the house to the optical terminal device. At this time, an extra length is generally generated in the optical fiber drawn into the house, but the extra length of the optical fiber has been conventionally stored in an optical terminal device.

As an optical terminator capable of accommodating the extra length of the optical fiber, there is one disclosed in Patent Document 1, for example. This optical termination device has an optical fiber extra length storage tray for storing an extra length of the optical fiber by winding it. When the optical fiber is attached to the optical terminal device, the extra optical fiber is wound around the optical fiber extra length storage part formed in the optical fiber extra length storage tray. After that, the apparatus main body side housing on which the main substrate and various devices constituting the optical termination device are arranged is attached to the optical fiber extra-length storage tray, and the housing side cover is attached to assemble the optical termination device. It had been.
JP 2002-258062 A

  However, in the conventional optical terminator, the optical fiber extra-length accommodating part that accommodates the extra-length optical fiber is located at the innermost part of the optical terminator, so that the optical fiber drawn into the house is connected to the optical terminator In this case, it is necessary to remove the housing-side cover and the device body-side housing from the optical fiber extra-length storage tray. There was a problem that the work was troublesome.

  The present invention has been made in view of the above points, and an object of the present invention is to provide an optical terminator capable of easily performing an optical fiber connection process and an extra length process.

From the first aspect of the present invention, the above problem is
A lower case (11),
An upper case (12) detachably attached to the lower case (11);
A circuit board (13) on which various components are mounted;
An external optical fiber winding portion (37) that is accommodated in an internal space formed by the lower case (11) and the upper case (12) and that accommodates an extra length portion of the external optical fiber (15) drawn from outside. And a base member (14) formed with
The outer optical fiber winding portion (37) is formed on the surface (35) of the base member (14) facing the upper case (12), and the lower case (11) of the base member (14) This can be solved by an optical terminal device in which the circuit board (13) is fixed to the opposite back surface.

  Moreover, in the said invention, it is desirable for the surface (35) of the said base member (14) to form the internal optical fiber winding part (38) which winds an internal optical fiber (41). Also, the surface (35) of the base member (14) has an optical interface connector (42) in which the external optical fiber (40) is connected to one end and the internal fiber (41) is connected to the other end. Is preferably provided.

  In the above invention, an LED holder (26) for holding the LED (25) is erected on the substrate, and the LED (25) emits light at a height position of the surface (35) of the base member (14). It is desirable to configure as follows.

  In addition, the said reference code is a reference to the last, and description of a claim is not limited by this.

  According to the present invention, since the extra length storage portion is formed on the surface facing the upper case of the base member, the extra length storage portion is exposed to the outside simply by removing the upper case. And extra length processing can be performed. As a result, the optical fiber connection process and the extra length process can be performed easily and in a short time. In addition, since the circuit board is fixed to the back surface of the base member, the base member and the wiring board function as an apparatus in an assembled state. It is easy to handle, and the optical fiber can be easily routed, so that the apparatus can be made compact.

  Next, the best mode for carrying out the present invention will be described with reference to the drawings.

  1 is an exploded perspective view of an optical terminator 10 according to an embodiment of the present invention, FIG. 2 is an external view of the optical terminator 10, and FIG. 3 shows a base member 14 to which a circuit board 13 is attached. 4 is a view showing the base member 14, and FIG. 5 is a view showing the circuit board 13.

  The optical terminator 10 is generally composed of a lower case 11, an upper case 12, a circuit board 13, a base member 14, and the like.

  The lower case 11 and the upper case 12 are made of resin, and are combined to form a storage space for storing the circuit board 13 and the base member 14. The lower case 11 has a bottomed shape in which a short side wall 11b and a long side wall 11c are erected on the outer periphery of the bottom plate portion 11a.

  A large number of heat radiation holes 18 are formed in the bottom plate portion 11a and the short side wall 11b. Further, a boss 16 is provided upright at a corner of the bottom plate portion 11a on the arrow X1 direction side in the figure, and a screw 17 is inserted into the boss 16. The screw 17 is used to fix the upper case 12 to the lower case 11. Furthermore, an opening 23 for exposing a LAN connector 28 and a power connector 29 described later to the outside is formed in the short side wall 11b on the arrow X2 direction side in the drawing.

  Further, two locking projections 20 are formed inside the long side wall 11c, two on one side and a total of four on both long side walls 11c. Furthermore, a locking projection 20 is also formed inside the short side wall 11b formed on the lower case 11 on the arrow X1 direction side in the figure. Although only one locking protrusion 20 is shown in FIG. 1, it is formed at each of the five locations described above.

  As will be described later, when the base member 14 is mounted on the lower case 11, the locking protrusion 20 is formed with a fixed engagement hole 48 and a first movable engagement hole formed in the long side wall 14 a of the base member 14. 49 and the second movable engagement hole 51 formed in the short side wall 14 b of the base member 14. By engaging the locking projections 20 formed at the five locations with the fixed engagement hole 48, the first movable engagement hole 49, and the second movable engagement hole 51, the base member 14 becomes the lower case. 11 is fixed.

  The fixed engagement hole 48, the first movable engagement hole 49, and the second movable engagement hole 51 are configured to be detachable from the locking projection 20 as will be described later. The member 14 is configured to be detachable from the lower case 11.

  The upper case 12 has a shape in which a short side wall 12b and a long side wall 12c are erected on the outer periphery of the front panel 12a. A plurality of heat radiation holes 22 are formed in the front panel 12a, and LED windows 21 corresponding to the plurality of LEDs 25 for displaying the operation of the optical termination device 10 are formed. Further, a screw boss (not shown in the figure) to which the screw 17 is screwed is formed in the transition portion in the direction of the arrow X1 in the figure inside the front panel 12a.

  The circuit board 13 has an LED 25, an optical module 27, a LAN connector 28, a power connector 29, and electronic and photoelectric components (not shown) mounted on the surface facing the base member 14, and performs various processes including photoelectric conversion processing. An optical termination circuit to be executed is formed. The circuit board 13 is disposed on the back surface 36 of the base member 14.

  Specifically, pillar portions 45 in which screw holes are formed are erected at positions near the four corners on the back surface of the base member 14. In addition, insertion holes through which the screws 31 are inserted are formed at the four corner positions of the circuit board 13. This insertion hole corresponds to the arrangement position of the column part 45 formed in the base member 14, and thus the insertion hole and the column part 45 of the circuit board 13 are positioned, and the screw 31 is inserted into the column part via the insertion hole. The circuit board 13 is fixed to the base member 14 by being screwed into the 45 screw holes.

  The LED 25 disposed on the circuit board 13 displays the operation of the optical termination device 10 as described above. In general, the LEDs 25 are arranged on a substrate. In this embodiment, the circuit board 13 and the LED window 21 formed on the front panel 12a of the upper case 12 are separated from each other. For this reason, the LED holder 26 is erected on the circuit board 13, and the LED 25 is disposed at the tip of the LED holder 26.

  In addition, an opening 47 through which the LED holder 26 is inserted is formed in the base member 14. As a result, the LED 25 and the LED window 21 can be brought close to each other, and the operation of the optical termination device 10 can be reliably confirmed from the outside of the upper case 12.

  The optical module 27 is a module that mainly performs photoelectric conversion, and one end portion of the internal optical fiber 41 (see FIG. 3B) is connected to a connection portion 30 provided at one end. The LAN connector 28 is connected to a LAN cable for connection to a PC or the like. In this embodiment, two LAN connectors 28 are arranged in parallel.

  A power connector 29 for supplying power to the circuit board 13 is provided on the side of the LAN connector 28. In the present embodiment, the LED holder 26, the optical module 27, the LAN connector 28, and the power connector 29, which are high-profile parts, are arranged along the outer periphery of the circuit board 13. The space efficiency (in particular, the space efficiency in the Z1 and Z2 directions which are the height direction) is increased.

  Next, the base member 14 will be described. The base member 14 is a resin molded product, and on its surface 35, an external optical fiber winding portion 37, an internal optical fiber winding portion 38, a heat radiation hole 46, a fixed engagement hole 48, a first movable engagement hole 49, A second movable engagement hole 51, a fixed member mounting portion 56, and the like are formed. A connector mounting portion 33 is formed at a predetermined position on the surface 35 of the base member 14 (see FIG. 4B). An optical interface connector 42 is disposed in the connector opening 33. Further, as described above, the column portion 45 for fixing the circuit board 13 is formed on the back surface 36 of the base member 14.

  The external optical fiber winding unit 37 is provided with an extra length portion of the optical fiber 15 that is drawn into the optical termination device 10 from the outside when the optical termination device 10 is installed. It is stored by winding. The external optical fiber winding portion 37 is configured by an outer guide wall 58 and an inner guide wall 59 that are erected on the external optical fiber winding portion 37.

  The external optical fiber 40 is guided by the outer guide wall 58 and the inner guide wall 59 constituting the external optical fiber winding portion 37, and is wound in the inner space. Moreover, the external optical fiber winding part 37 is made into the ellipse shape by front view, as shown to FIG. 3 (B) and FIG. 4 (B). The external optical fiber 40 is illustrated only in FIG. 3B for convenience of illustration.

  The internal optical fiber winding unit 38 winds an extra length portion of an optical fiber (hereinafter, this optical fiber is referred to as an internal optical fiber 41) that connects the optical interface connector 42 and the optical module 27 in the optical termination device 10. It is to be stored. The inner optical fiber winding portion 38 is formed by an annular groove formed in the base member 14.

  The internal optical fiber 41 is wound inside the internal optical fiber winding portion 38 having a groove shape. An optical connector 44 is disposed at one end of the internal optical fiber 41, and the optical connector 44 is connected to one end of an optical interface connector 42 disposed on the surface 35 of the base member 14.

  An optical connector 43 disposed at the end of the external optical fiber 40 is connected to the other end of the optical interface connector 42. Therefore, the external optical fiber 40 and the internal optical fiber 41 are optically connected via the optical interface connector 42.

  Further, as shown in FIGS. 3B and 4B, the inner optical fiber winding portion 38 has a substantially circular shape when viewed from the front. At this time, the diameter of the inner optical fiber winding portion 38 is set to 60 mm or more. This is because if the diameter of the inner optical fiber winding portion 38 is less than 60 mm, the bending of the inner optical fiber 41 becomes large, and the propagation of the optical signal is adversely affected. The internal optical fiber 41 is also shown only in FIG. 3B for convenience of illustration.

  The heat radiating hole 46 is formed at a position excluding the formation position of the external optical fiber winding part 37, the internal optical fiber winding part 38, and the connector mounting part 33 of the base member 14. Various electronic components and photoelectric components disposed on the circuit board 13 generate a large amount of heat. However, the heat generated from the electronic component and the photoelectric component is efficiently generated from the heat radiating hole 18 formed in the lower case 11, the heat radiating hole 46 formed in the base member 14, and the heat radiating hole 22 formed in the upper case 12. It can dissipate heat well.

  The fixed engagement holes 48 are respectively formed in the long side walls 14 a of the base member 14. The formation position of the fixed engagement hole 48 is set at a position near the end of the long side wall 14a in the direction of the arrow X2 in the drawing. The fixed engagement hole 48 is configured to engage with a locking projection 20 formed on the lower case 11 when the base member 14 is mounted on the lower case 11.

  At the time of mounting, the procedure for engaging the locking protrusion 20 with the fixed engagement hole 48 is as follows. That is, first, the base member 14 is pressed and inserted into the lower case 11 after the formation position of the fixed engagement hole 48 and the formation position of the locking projection 20 are aligned. At this time, by pressing the base member 14 toward the lower case 11, the long side wall 11 c is elastically deformed outward by being pressed by the locking protrusion 20. When the base member 14 is further pressed toward the lower case 11, the locking protrusion 20 advances toward the fixed engagement hole 48, and the locking protrusion 20 eventually engages in the fixed engagement hole 48. As a result, the base member 14 is locked to the lower case 11 on the arrow X2 direction side in the figure.

  Since the shape of the fixed engagement hole 48 is set larger than the shape of the locking protrusion 20, the base member 14 is in the lower case when the locking protrusion 20 is engaged with the fixed engagement hole 48. 11 is configured to be slightly displaceable.

  Further, in order to detach the base member 14 from the lower case 11, the base member 14 is pulled out strongly with respect to the lower case 11. As a result, the long side wall 11c is elastically deformed, and the locking projection 20 is disengaged from the fixed engagement hole 48, so that the engagement between the locking projection 20 and the fixed engagement hole 48 is released. Therefore, the base member 14 can be taken out from the lower case 11.

  The first movable engagement hole 49 is also formed in each long side wall 14 a of the base member 14. The formation position of the first movable engagement hole 49 is set at a position near the end of the long side wall 14a in the direction of the arrow X1 in the drawing. The first movable engagement hole 49 is also configured to engage with the locking protrusion 20 formed in the lower case 11 when the base member 14 is mounted on the lower case 11.

  Here, paying attention to the position where the first movable engagement hole 49 is formed, a substantially U-shaped slit 53 is formed around the position where the first movable engagement hole 49 is formed on the long side wall 14a. Thus, the first tongue piece 50 is formed. And the 1st movable engagement hole 49 is set as the structure formed in the 1st tongue piece part 50 (refer FIG. 3 (A), (C), FIG. 4 (A), (C)). . The first tongue piece 50 is configured to be elastically deformable with respect to the long side wall 14a as indicated by an arrow A in FIG.

  The procedure for engaging the locking projection 20 with the first movable engagement hole 49 is as follows. That is, first, the formation position of the first movable engagement hole 49 and the formation position of the locking projection 20 are aligned, and then the base member 14 is pressed into the lower case 11 and inserted.

  At this time, since the first tongue piece portion 50 has a cantilever shape, the base member 14 is elastically deformed inward by pressing the base member 14 toward the lower case 11, so that the first movable engagement hole 49 is formed. When it engages with the locking projection 20, it is elastically restored to the state before deformation. As a result, the locking protrusion 20 engages with the first movable engagement hole 49, whereby the base member 14 is locked to the lower case 11 on the arrow X1 direction side in the figure.

  The second movable engagement hole 51 is formed in the short side wall 14b of the base member 14 on the arrow X1 direction side. The second movable engagement hole 51 has substantially the same configuration as the first movable engagement hole 49 described above, and is formed in the lower case 11 when the base member 14 is attached to the lower case 11. It is configured to engage with the locking protrusion 20.

  In addition, a substantially U-shaped slit 54 is formed around the position where the second movable engagement hole 51 is formed on the short side wall 14b, whereby a second tongue piece 52 is formed. The 2nd movable engagement hole 51 is set as the structure formed in this 2nd tongue piece part 52 (refer FIG.3 (E) and FIG.4 (E)). The second tongue piece 52 is configured to be elastically deformable with respect to the short side wall 14b as indicated by an arrow B in FIG.

  In order to attach the base member 14 to the lower case 11, first, the formation position of the second movable engagement hole 51 and the formation position of the locking projection 20 are aligned, and then the base member 14 is pressed against the lower case 11. Insert. At this time, since the second tongue piece 52 has a cantilever shape, the base member 14 is elastically deformed inward by pressing the base member 14 toward the lower case 11, so that the second movable engagement hole 51 is formed. When it engages with the locking projection 20, it is elastically restored to the state before deformation. As a result, the locking projection 20 is engaged with the second movable engagement hole 51, and the base member 14 is also locked to the lower case 11 on the side of the arrow X 1 in the drawing.

  Further, in order to detach the base member 14 from the lower case 11, the first and second tongue pieces 50, 52 are pushed inward to be elastically deformed. With the base member 14 mounted on the lower case 11, a part of the long side wall 14 a is exposed on the lower case 11 (this part is covered by the upper case 12). A part is also configured to be exposed from the lower case 11. By deforming the portions exposed from the lower case 11 of the first and second tongue pieces 50 and 52 inward, the first and second movable engagement holes 49 and 51 and the locking projection 20 The engagement is released. Therefore, the base member 14 can be taken out from the lower case 11 by pulling out the base member 14 from the lower case 11 in this state.

  In the above-described embodiment, a part of the first and second tongue pieces 50 and 52 is configured to be exposed from the lower case 11, and the first and second movable engagements are performed by pressing the exposed portions. The engagement between the holes 49 and 51 and the locking protrusion 20 is released. However, the second tongue piece 52 is configured to be hidden in the lower case 11, and a dummy hole imitating the heat dissipation hole 18 is provided at a position facing the second tongue piece 52 of the short side wall 14b. 19 (see FIGS. 1 and 2E) may be formed.

  In order to take out the base member 14 from the lower case 11 in the configuration in which the dummy hole 19 is provided, the second tongue piece portion 52 is displaced inward by inserting a jig (driver or the like) from the dummy hole 19, The engagement between the second movable engagement hole 51 and the locking projection 20 is released. As a result, the base member 14 can be displaced slightly upward (in the Z1 direction) from the lower case 11. Further, the engagement between the first movable engagement hole 49 and the locking projection 20 and the engagement between the fixed engagement hole 48 and the locking projection 20 are released in the same manner as described above.

  Thus, in the configuration in which the dummy holes 19 are provided, a person who does not know the existence of the dummy holes 19 cannot remove the base member 14 from the lower case 11. Therefore, an accident in which the base member 14 is mistakenly removed from the lower case 11 can be reliably prevented.

  On the other hand, the fixing member mounting portion 56 is a rectangular groove portion, and is provided in the vicinity of the external optical fiber winding portion 37 at the corner portion of the base member 14. Further, the fixing member mounting portion 56 is configured such that the optical fiber fixing member 55 can be mounted therein.

  The fixing member mounting portion 56 has a function of fixing the optical fiber 15 drawn from the outside of the apparatus together with the optical fiber fixing member 55 to the optical terminal device 10. The optical fiber fixing member 55 has a configuration in which a pair of fixing member halves are connected by a joint portion. The optical fiber 15 is inserted and attached between the pair of fixing member halves, and the optical fiber fixing member 55 is in this state. Is attached to the fixing member mounting portion 56, so that the optical fiber 15 is fixed to the base member 14. Therefore, the fixing operation of the optical fiber 15 to the base member 14 can be performed very easily.

  Here, a process of attaching / detaching the base member 14 having the above configuration to / from the lower case 11 will be described.

  In order to attach the base member 14 to the lower case 11, the circuit board 13 is fixed to the base member 14 in advance. Specifically, the optical connector 44 provided at one end of the internal optical fiber 41 is connected to the optical interface connector 42 provided on the surface 35 of the base member 14, and the extra length portion of the internal optical fiber 41 is connected to the internal light. After being wound around the fiber winding portion 38, the other end is connected to the connection portion 30 of the optical module 27. Subsequently, the circuit board 13 is positioned on the pillar portion 45, and the screw 31 is screwed into the screw hole of the pillar portion 45. As a result, the circuit board 13 is fixed to the base member 14.

  In the optical termination device 10 according to this embodiment described above, the circuit board 13 is fixed to the base member 14, so that no electronic components or photoelectric components are provided in the lower case 11 and the upper case 12. For this reason, in the test process performed at the time of manufacturing the optical termination device 10, the base member 14 to which the circuit board 13 is fixed before the base member 14 to which the circuit board 13 is fixed is stored in the cases 11 and 12. Inspection can be performed in the state. This eliminates the need to remove the base member 14 from the cases 11 and 12 when a defect occurs, thereby improving inspection efficiency.

  In addition, the optical termination device 10 according to the present embodiment forms an external optical fiber winding portion 37 and an internal optical fiber winding portion 38 on the surface 35 facing the upper case 12 of the base member 14. For this reason, when the optical fiber 15 is connected to the optical termination device 10, the external optical fiber winding part 37 and the internal optical fiber winding part 38 are exposed to the outside simply by removing the upper case 12. , 40, 41 and extra length processing can be performed.

  Thereby, it becomes possible to perform the connection process and the extra length process of each optical fiber 15, 40, 41 easily and in a short time. Moreover, it is also possible to perform the connection process and the extra length process with the base member 14 to which the circuit board 13 is fixed removed from the lower case 11 as necessary.

  Furthermore, since the circuit board 13 is fixed to the back surface 36 of the base member 14 in the optical terminator 10 according to the present embodiment, each light can be compared with a configuration in which the circuit board 13 is disposed in the upper or lower cases 11 and 12. The routing of the fibers 15, 40, 41 is simplified, and the optical termination device 10 can be made compact.

  The preferred embodiments of the present invention have been described in detail above. However, the present invention is not limited to the specific embodiments described above, and various modifications can be made within the scope of the present invention described in the claims. It can be modified and changed.

FIG. 1 is an exploded perspective view of an optical termination device according to an embodiment of the present invention. 2A and 2B are views showing the appearance of an optical termination device according to an embodiment of the present invention, where FIG. 2A is a plan view, FIG. 2B is a front view, FIG. 2C is a bottom view, and FIG. (E) is a right side view and (F) is a rear view. FIGS. 3A and 3B are diagrams showing the base member with the circuit board attached, where FIG. 3A is a plan view, FIG. 3B is a front view, FIG. 3C is a bottom view, and FIG. E) is a right side view, and (F) is a rear view. 4A and 4B are diagrams showing the base member with the circuit board removed, where FIG. 4A is a plan view, FIG. 4B is a front view, FIG. 4C is a bottom view, and FIG. 4D is a left side view. E) is a right side view, and (F) is a rear view. 5A and 5B are diagrams showing a circuit board, in which FIG. 5A is a front view, FIG. 5B is a bottom view, FIG. 5C is a left side view, and FIG. 5D is a right side view.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Optical termination device 11 Lower case 12 Upper case 13 Circuit board 14 Base member 15 Optical fiber 20 Locking protrusion 21 LED hole 25 LED
26 LED holder 27 Optical module (optical transceiver, big tail type)
28 LAN connector 29 Power connector 30 Connection part (optical transceiver fiber connection part)
35 Front surface 36 Rear surface 37 External optical fiber winding portion 38 Internal optical fiber winding portion 39 Hook portion 40 External optical fiber 41 Internal optical fiber 42 Optical interface connector (SC connector adapter)
43, 44 Optical connector (SC connector plug)
48 fixed engagement hole 49 first movable engagement hole 50 first tongue piece 51 second movable engagement hole 52 second tongue pieces 53, 54 slit 55 optical fiber fixing member 56 fixing member mounting portion

Claims (4)

The lower case,
An upper case detachably attached to the lower case;
A circuit board on which various components are mounted;
A base member that is housed in an internal space formed by the lower case and the upper case, and that is formed with a first surplus length accommodating portion that accommodates an extra length portion of the external optical fiber drawn from the outside. And
An optical terminal device in which the extra length storage portion is formed on a surface of the base member facing the upper case, and the circuit board is fixed to a back surface of the base member facing the lower case.   The optical termination device according to claim 1, wherein a second surplus length accommodating portion for winding an internal optical fiber is formed on the surface of the base member.   3. The optical termination device according to claim 2, wherein an optical interface connector having one end connected to the external optical fiber and the other end connected to the internal fiber is disposed on the surface of the base member.   4. The optical termination device according to claim 1, wherein an LED holding member that holds an LED is erected on the substrate, and the LED emits light at a height position on the surface of the base member. 5. .

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