JP6070740B2 - Key unit positioning structure - Google Patents

Description

  The present invention relates to a key unit positioning structure in which a plurality of key units are arranged in an instrument body.

  2. Description of the Related Art Conventionally, as widely seen in inexpensive keyboard instruments, a key unit positioning structure is known in which a key unit obtained by unitizing a plurality of keys, for example, for one octave is disposed on a base portion of an instrument. As a keyboard instrument that employs this type of structure, a keyboard device disclosed in Patent Document 1 below is known. In this device, as a method of assembling the key unit, a connecting portion for connecting to an adjacent key unit is provided at the end in the left-right direction of each key unit, and a plurality of key units are connected in the left-right direction. It is shown.

  However, there is a dimensional error due to manufacturing or the like in the key unit itself or the connecting portion. Therefore, in the above structure, when a large number of key units are connected, each error is accumulated, and the error as the full width of the keyboard increases. Then, in some key units, the positional deviation between the switch for detecting the key press and the key may become large. In addition, the gap between the case and the keyboard may become large. Moreover, since the assembly order is fixed, there is no degree of freedom in the assembly process.

  On the other hand, in order to individually position each key unit with respect to the base portion, a structure in which a positioning portion is provided at a predetermined position of the key unit is also known. With this structure, the positioning of each key unit with respect to the base portion can be performed relatively accurately.

Japanese Patent Laid-Open No. 10-240229

  However, a dimensional error corresponding to the width of one key unit may occur in the interval between the positioning portions of adjacent key units. Therefore, the gap between adjacent key units depends on the error in the width of the key unit, and the size of the gap may vary depending on the location. Appearance deteriorates when gaps vary. In particular, if a large gap is generated near the center of the keyboard, it tends to stand out. Also, at the left and right ends of the keyboard, if the gap between the case and the case is large, it is easily noticeable. Therefore, there is room for improvement in terms of improving the appearance of the keyboard.

  The present invention has been made to solve the above-described problems of the prior art, and its object is to reduce the number of parts by using a common key unit and to improve the appearance of the keyboard by increasing the positioning accuracy of the key unit. An object of the present invention is to provide a positioning structure for a key unit.

  In order to achieve the above object, the key unit positioning structure according to claim 1 of the present invention is such that a plurality of key units having a common positioning portion are positioned in the left-right direction, which is the key arrangement direction, with respect to the base portion. Each of the plurality of key units (UT) has a plurality of engaging portions (25, 26, 27) provided at different positions in the left-right direction as the positioning portions. The base portion (30) has a plurality of arrangement regions (R) for arranging the key units in the left-right direction, and the key unit in each of the arrangement regions of the base portion. Among the plurality of engaging portions, a portion corresponding to one engaging portion is a positioning corresponding portion (31, 33) that engages with the one engaging portion and restricts the position of the key unit in the left-right direction. 34) are provided. Both of the portions corresponding to the other engaging portions other than the one engaging portion (25x) are configured not to engage with the other engaging portions in the left-right direction. The position of the positioning corresponding portion in the arrangement region in the left-right direction is different.

  In addition, the code | symbol in the said parenthesis is an illustration.

  According to the first aspect of the present invention, it is possible to reduce the number of parts by sharing the key unit and to improve the appearance of the keyboard by increasing the positioning accuracy of the key unit.

  According to the second aspect, the key unit disposed at the center can be accurately positioned at the center of the keyboard. According to the third aspect, the two key units disposed near the center can be positioned near the center of the keyboard. According to the fourth aspect, the accuracy of the gap between the two key units disposed near the center can be improved. According to the fifth aspect, the accuracy of the gap between the left and right end positions of the keyboard and the instrument body can be increased.

A plan view (FIG. (A)) of a keyboard instrument to which the key unit positioning structure is applied, a plan view (figure (b)) showing a main part of the positioning structure, a side view (figure (c)), one key unit FIG. 4 is a plan view (FIG. (D)), a front view (FIG. (E)) viewed from the player side, and a plan view (FIG. (F)) of the base portion. It is a top view ((a)-(e)) of the key unit of a modification. A plan view of the base portion of the modified example (FIG. (A)), a side view showing the main part of the assembly part of the common base end and the base portion of the key unit of the modified example (FIG. (B)), the base of the modified example They are a top view (figure (c)) and a front view (figure (d)) of the arrangement field in a section.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  FIG. 1A is a plan view of a keyboard instrument to which a key unit positioning structure according to an embodiment of the present invention is applied. The keyboard instrument 10 includes a plurality of (for example, three) octave keyboards KB between the left side plate 12L and the right side plate 12R of the instrument body 11. Hereinafter, the key arrangement direction of the keyboard KB is referred to as the left-right direction.

  FIGS. 1B and 1C are a plan view and a side view showing the main part of the positioning structure of the key unit. A base portion 30 is fixed to the instrument body 11. The base portion 30 is a part of a housing (case), a frame, or a substrate, and has a substantially horizontal upper surface. A plurality of key units UT (UTA, UTC, UTC) are mounted on the upper surface of the base unit 30 in the left-right direction. The base unit 30 may be provided with a switch for detecting a key press corresponding to each key.

  1D and 1E are a plan view of one key unit UT and a front view as seen from the player side. FIG. 1 (f) is a plan view of the base portion 30. The configuration of the plurality of key units UT is common. As shown in FIGS. 1D and 1E, each key unit UT is integrally configured to include a white key 23W and a black key 23B in a key range of one octave. The key body of the white key 23W is connected to the common base end 21 by the hinge 22W, and the key body of the black key 23B is connected to the common base end 21 by the hinge 22B. The hinges 22W and 22B are thin in the vertical direction, and the key bodies are swingable in the vertical direction by the hinges 22W and 22B. On the other hand, the displacement of the key bodies in the horizontal direction is substantially restricted. Therefore, the key guide for restricting the lateral displacement of the front portion of the key is not provided.

  In this example, a white key unit in which seven white keys 23W are integrated and a black key unit in which five black keys 23B are integrated are overlapped with each other at the respective base ends, and a common base end 21 is obtained. As a result, it is a unit of key range for one octave. Note that the key unit UT only needs to be integrated, and the component configuration and the number of elements constituting the key unit UT are not limited. For example, the white key unit may be configured by dividing the white key 23W into two units of three units and four units, and the base ends of both units may be overlapped.

  A plurality of pins 25 (engaging portions) project downward from the common base end portion 21 at different positions in the left-right direction as positioning portions for restricting the position of the key unit UT in the left-right direction. . In the example of FIG. 1, a total of three pins 25 are provided at the center position of the width of the key unit UT and near the left and right ends. The positions and the number of the pins 25 in each key unit UT are also common. The pin 25 is, for example, a cylindrical shape.

  As shown in FIG. 1 (f), the base unit 30 has an arrangement area R (RA, RB, RC) in which the key units UT are arranged by the number of key units UT. In this example, since the keyboard KB is 3 octaves, the number of arrangement regions R is also three.

  In each arrangement region R, one lateral positioning hole 31 and two lateral escape holes 32 are formed as holes penetrating in the vertical direction. In the middle arrangement region RB in the left-right direction, a lateral positioning hole 31 is formed at the center position of the width of the arrangement region RB, and a lateral relief hole 32 is formed near the left and right ends. That is, in each arrangement region R, the lateral relief hole 32 and the lateral positioning hole 31 are formed in a portion corresponding to the position of the pin 25 of the key unit UT. However, the relative positional relationship between the lateral relief hole 32 and the lateral positioning hole 31 in the arrangement region R differs depending on the arrangement region R. A visual partition between the arrangement regions R is not necessary, but is distinguished by the arrangement of the lateral relief holes 32 and the lateral positioning holes 31. The configuration other than the arrangement of the lateral relief holes 32 and the lateral positioning holes 31 is common between the arrangement regions R.

  Specifically, in the arrangement region RA on the left side, a lateral relief hole 32 is formed near the left end of the arrangement region RA and the center position in the left-right direction, and a lateral positioning hole 31 is formed near the right end. In the arrangement region RC on the right side, a lateral relief hole 32 is formed in the vicinity of the right end portion of the arrangement region RC and the central position in the left-right direction, and a lateral positioning hole 31 is formed in the vicinity of the left end portion. As described above, the positions of the lateral positioning holes 31 in the left-right direction in each arrangement region R are different.

  Here, the lateral positioning hole 31 is a hole with a circular horizontal section that fits the pin 25. On the other hand, the lateral relief hole 32 is a laterally long hole having such a size that the pin 25 is loosely fitted, and is the same as the pin 25 or larger than the diameter of the pin 25 in the front-rear direction. Therefore, when the pin 25 and the lateral positioning hole 31 are engaged, the position of the key unit UT in the left-right direction is restricted, and the position of the key unit UT is also restricted in the front-rear direction. The lateral positioning hole 31 functions as a “positioning corresponding part”. On the other hand, the other two pins 25 that do not engage with the lateral positioning holes 31 are inserted and loosely fitted into the lateral relief holes 32, but the pins 25 and the lateral relief holes 32 do not contact at least in the left-right direction. Therefore, the reference for positioning the key unit UT in the left-right direction depends on the arrangement of the positioning holes 31.

  By the way, after the key unit UT is positioned, the common base end portion 21 is fixed by a mechanism or the like that presses against the base portion 30. In addition, you may have the positioning mechanism of the front-back direction of the key unit UT separately.

  Since the key unit UTB arranged in the central arrangement region RB is positioned by the central lateral positioning hole 31, the maximum positional deviation amount of the left and right ends of the key unit UTB is the width of the key unit UTB. Only half the dimensional error is required. Therefore, the key unit UTB can be accurately arranged at the center in the left-right direction of the entire width of the keyboard KB.

  Since the key unit UTA arranged in the left arrangement area RA is positioned in the right lateral positioning hole 31, the maximum positional deviation amount of the right end portion of the key unit UTA is from the right pin 25 to the key unit. Only the dimensional error that occurs at a short distance to the right end of the UTA is sufficient. Therefore, the accuracy of the gap between the key unit UTA and the key unit UTB can be increased. Since the key unit UTC arranged in the right arrangement region RC is positioned by the left lateral positioning hole 31, the maximum positional deviation amount of the left end portion of the key unit UTC is changed from the left pin 25 to the key unit. Only the dimensional error that occurs at a short distance to the left end of the UTC is sufficient. Therefore, the accuracy of the gap between the key unit UTC and the key unit UTB can be increased.

  Since the central area of the keyboard KB is conspicuous, it is good to place the key unit UTB in the center and to make the gap between the key units UTA and UTC adjacent to it appropriate and to reduce the variation between the keyboard instruments. This is important for maintaining a good appearance. As described above, the lateral positioning hole 31 is arranged in the center in the arrangement area RB, on the right side in the arrangement area RA, and on the left side in the arrangement area RC, thereby improving the appearance. Further, since the configuration of the key unit UT is common, the number of parts is reduced.

  In the example of FIG. 1, the number of key units UT is three. However, in the keyboard instrument 10 in which the number of key units UT is odd, the lateral positioning hole 31 is provided in the center in the center region R in the left-right direction. The key unit UT disposed at the center can be accurately positioned at the center of the keyboard KB. Moreover, in the arrangement | positioning area | region R adjacent to the center arrangement | positioning area | region R, the key unit UT arrange | positioned in the center is provided by providing the horizontal positioning hole 31 in the position near the center arrangement | positioning area | region R as much as possible. And the accuracy of the gap between the adjacent key unit UT can be improved.

  According to the present embodiment, the number of parts can be reduced by sharing the key unit, and the positioning accuracy of the key unit can be increased to improve the appearance of the keyboard.

  Further, since the set of the lateral positioning hole 31 for positioning the key unit UT and the pin 25x is independent for each arrangement region R, that is, for each octave, the interval between the octaves depends on the formation position of the lateral positioning hole 31 in each octave. The gap can be arbitrarily adjusted.

  It should be noted that the present invention may be applied only to a part of the area in appearance, for example, the most important area. That is, the position of the positioning corresponding portion (lateral positioning hole 31) in the left-right direction in the arrangement region R may be different between at least two arrangement regions R. In addition, the side relief hole 32 is provided in the portion that does not serve as the positioning corresponding portion, but it is sufficient that the shape does not engage with the pin 25 at least in the left-right direction. Or a groove or the like.

  2 and 3, various modifications in which the number of arrangement regions R (the number of key units UT) and the relative positional relationship between the lateral relief holes 32 and the lateral positioning holes 31 in the respective arrangement regions R are different. An example is shown.

  2A to 2E are plan views of a key unit UT according to a modification. In FIG. 2, the pin 25 is not visible from above, but for convenience of explanation, it is indicated by a solid line (white circle) or a black circle. Among the pins 25, those indicated by black circles are the pins 25 that engage with the lateral positioning holes 31, and this is particularly referred to as “pin 25 x”. Although illustration of the arrangement | positioning area | region R is abbreviate | omitted, in the arrangement | positioning area | region R, the horizontal positioning hole 31 is formed in the part corresponding to the pin 25x, and the side relief hole 32 is formed in the part corresponding to the pin 25 which is not the pin 25x. The

  First, FIG. 2A shows an example in which the key unit UT is an even number. In this example, two key units UT1 and UT2 are arranged across the center C of the keyboard KB. The lateral positioning hole 31 is provided at a position closest to the center C. That is, in the arrangement region R on the left side of the center C, the lateral positioning hole 31 is provided in the rightmost position, and in the arrangement region R on the right side of the center C, the lateral positioning hole 31 is provided in the leftmost position. Thereby, the position of the mutually adjacent ends between the two key units UT1 and UT2 sandwiching the center C becomes accurate, and the variation between the instruments in the gap between them is reduced. This example is a positioning structure that emphasizes the appearance of the center C of the keyboard KB.

  In FIG. 2B, attention is paid to the positioning of the key units UT arranged at the left and right ends regardless of the number of the key units UT. In the arrangement region R corresponding to the key unit UT3 disposed at the left end, the lateral positioning hole 31 is provided at the leftmost position, and in the arrangement region R corresponding to the key unit UT4 disposed at the right end, the lateral positioning hole 31 is provided. 31 is provided at the rightmost position. As a result, the positions of the left end of the key unit UT3 and the right end of the key unit UT4 become accurate, and the gap between the instruments in the gap between the left end of the key unit UT3 and the left side plate 12L and the gap between the right end of the key unit UT4 and the right side plate 12R. Becomes smaller. This example is a positioning structure that emphasizes the appearance of the left and right ends of the keyboard KB.

  In FIG. 2C, the number of key units UT is an even number of 4 or more. In this example, two key units UT6 and UT7 are arranged across the center C of the keyboard KB. In each of the arrangement regions R corresponding to the key units UT6 and UT7, the lateral positioning hole 31 is provided in the middle. As a result, the two key units UT6 and UT7 disposed near the center can be positioned near the center of the keyboard KB. In the arrangement region R corresponding to the key unit UT5 adjacent to the left side of the key unit UT6, the lateral positioning hole 31 is provided at the rightmost position. As a result, the positions of the right end of the key unit UT5 and the left end of the key unit UT6 are accurate, and variations between musical instruments in the gap between them are reduced. In the arrangement region R corresponding to the key unit UT8 adjacent to the right side of the key unit UT7, the lateral positioning hole 31 is provided at the leftmost position. As a result, the positions of the right end of the key unit UT7 and the left end of the key unit UT8 become accurate, and variations between musical instruments in the gap between them are reduced. This example is a positioning structure that emphasizes the appearance of a range relatively close to the center of the keyboard KB while balancing the whole.

  In the example of FIG. 2 (c), when the appearance of the center C of the keyboard KB is particularly important, the lateral positioning hole 31 is positioned closer to the center C also in the arrangement region R corresponding to the key units UT6 and UT7. May be provided.

  The number of the side relief holes 32 may be one or more, and may be three or more. FIGS. 2D and 2E show an example in which there is one lateral positioning hole 31 and three or more lateral relief holes 32.

  In FIG. 2D, the number of key units UT is an even number of 4 or more. In this example, each of the arrangement regions R corresponding to the two key units UT10 and UT11 across the center C of the keyboard KB has four positions (one lateral positioning hole 31 and three lateral relief holes 32). The lateral positioning hole 31 is provided at a position closest to the center C. Thereby, the position of the mutually adjacent ends between the two key units UT10 and UT11 sandwiching the center C becomes accurate. Further, in the arrangement region R corresponding to the key unit UT9 adjacent to the left side of the key unit UT10, the lateral positioning hole 31 is provided at the second position from the center C side (rightmost side) out of the four locations. In the arrangement region R corresponding to the key unit UT12 adjacent to the right side of the key unit UT11, the lateral positioning hole 31 is provided at the second position from the center C side (leftmost side) out of the four locations.

  In the example of FIG. 2D, when the case where the number of key units UT is six is considered, the following may be performed. In the arrangement region R corresponding to the key unit UT adjacent to the left side of the key unit UT9, the lateral positioning hole 31 is provided at the third position from the right among the four locations. In the arrangement region R corresponding to the key unit UT adjacent to the right side of the key unit UT12, the lateral positioning hole 31 is provided at the third position from the left of the four locations.

  Thus, by adopting a position farther from the center C as the position of the lateral positioning hole 31 in the arrangement region R farther from the center C, the overall balance of the keyboard KB is emphasized while emphasizing the appearance of the center of the keyboard KB. The positional accuracy of each key unit UT can be increased while taking

  On the other hand, in the example of FIG. 2 (d), when it is desired to emphasize the appearance of the range close to the center of the keyboard KB, the lateral positioning hole 31 is located closer to the center C in the arrangement region R corresponding to the key units UT9 and UT12. You may provide in a position.

  In the example of FIG. 2E, the number of key units UT is an odd number of 5 or more. In this example, in the middle arrangement region R corresponding to the key unit UT15 overlapping the center C, the lateral positioning hole 31 is provided in the middle. In each of the arrangement regions R corresponding to the key units UT13, UT14, UT16, and UT17 other than the key unit UT15, the lateral positioning hole 31 out of five positions (one lateral positioning hole 31 and four lateral relief holes 32). Is provided at a position closest to the center C. Thereby, while emphasizing the central appearance of the keyboard KB, it is possible to improve the appearance of a range relatively close to the center of the keyboard KB while maintaining the overall balance.

  As described above, in the examples of FIGS. 2C, 2D, and 2E, in the two arrangement regions R sandwiching the center C, or in the arrangement region R overlapping the center C, the center C of the keyboard KB or its It has a positioning structure that emphasizes the vicinity. At the same time, in the arrangement region R other than these (not near the center), the lateral positioning hole 31 is provided at a position closer to the center C than the center in the width direction of the arrangement region R. As a result, even if the gap varies, the gap becomes larger as it is closer to the end of the keyboard KB, and the variation can be reduced near the center. Therefore, it is possible to improve the positional accuracy of each key unit UT while placing importance on the central appearance of the keyboard KB.

  In the example of FIG. 2D as well, when emphasizing the overall balance of the keyboard KB, a position farther from the center C may be adopted as the position of the lateral positioning hole 31 in the arrangement region R farther from the center C. Good.

  Any one of the configurations in FIGS. 3A to 3D may be combined with any one of the configurations in FIGS. 1 and 2A to 2E. FIG. 3A is a plan view of a base 30 according to a modification. In FIG. 1 and FIG. 2, the horizontal positioning hole 31 has a circular horizontal cross section, but in the example of FIG. The width in the left-right direction of the lateral positioning hole 31 is a fitting size with respect to the diameter of the pin 25. On the other hand, the lateral escape hole 32 is horizontally long, but the width in the front-rear direction is a size that fits the diameter of the pin 25. Accordingly, the position of the key unit UT in the left-right direction is restricted by the engagement between the pin 25x and the lateral positioning hole 31. Moreover, the position of the key unit UT in the front-back direction is regulated by the pin 25 and the side relief hole 32 engaging with each other. Thus, the lateral positioning hole 31 and the lateral escape hole 32 share the lateral positioning function and the longitudinal positioning function.

  FIG. 3B is a side view showing the main part of the assembly portion of the common base end portion 21 and the base portion 30 of the key unit UT of the modified example. In the example of FIGS. 1 and 2, the pin 25 is provided in the common base end portion 21 and the lateral positioning hole 31 and the lateral relief hole 32 are provided in the base portion 30, but in the example of FIG. Reverse. The common base end portion 21 is provided with a plurality of (for example, three) holes 26 having the same shape at different positions in the left-right direction. On the other hand, only one pin 33 having a shape fitting to the hole 26 is provided in the arrangement region R of the base portion 30. The hole 26 corresponds to a positioning portion (a plurality of engaging portions) common to each key unit UT, and the pin 33 corresponds to a positioning corresponding portion. The position of the key unit UT in the left-right direction and the front-rear direction is regulated by the pin 33 and one hole 26 that engages with the pin 33. The position where the pin 33 is provided differs depending on the arrangement region R.

  3C and 3D are a plan view and a front view of the arrangement region R in the base portion 30 of the modification. The shape of the positioning corresponding portion provided in the arrangement region R of the positioning portion (plural engagement portions) and the base portion 30 common to each key unit UT is not limited to those exemplified so far. For example, in comparison with the example of FIGS. 1 and 2, as shown in FIGS. 3C and 3D, a rib 27 may be formed on the common base end portion 21 instead of the pin 25. . In that case, grooves 34 and 35 are formed in the arrangement region R in place of the lateral positioning hole 31 and the lateral relief hole 32, respectively. The groove portion 34 is narrower in the left-right direction than the groove portion 35 and fits with the rib 27. The rib 27 is loosely fitted to the groove portion 35. In the example of FIGS. 3C and 3D, the position of the key unit UT in the left-right direction is regulated by the engagement between the middle rib 27x and the groove 34.

  In the above-described embodiment and each modified example, the pin 25 (engagement portion) and the corresponding lateral positioning hole 31 (positioning correspondence portion) are not necessarily odd, but are necessarily the key unit UT or the arrangement region R. There may not be anything located in the center in the left-right direction. In this case, if it is desired to position the key unit UT on the basis of the center as much as possible, a positioning corresponding portion is provided so that the engaging portion closest to the center is used as an engaging portion (such as the pin 25x) that is actually engaged. Good. Further, the method of determining the position of the positioning corresponding portion for each arrangement region R has been described so far as an example, and may be freely selected depending on the location where accuracy is important.

  Further, the engaging portion and the positioning corresponding portion need only be in a relationship that can regulate the position of the key unit UT in the left-right direction by engagement, and the shape and number are not limited.

  The key unit UT need only be unitized, and it is not essential to have both the white key 23W and the black key 23B. For example, the present invention may be applied to the assembly of the unit having only the white key 23W. Good. Further, the key range of the key unit UT does not have to be one octave.

  Although the present invention has been described in detail based on preferred embodiments thereof, the present invention is not limited to these specific embodiments, and various forms within the scope of the present invention are also included in the present invention. included. You may combine suitably a part of above-mentioned embodiment and modification.

  UT key unit, R arrangement area, 25 pin (engagement part, positioning part), 26 hole (engagement part), 27 rib (engagement part), 30 base part, 31 lateral positioning hole (positioning corresponding part), 32 side relief hole, 33 pin (positioning corresponding part), 34 groove (positioning corresponding part)

Claims (5)

A key unit positioning structure in which a plurality of key units having a common positioning portion are positioned and arranged in the left-right direction, which is a key arrangement direction, with respect to a base portion,
Each of the plurality of key units has a plurality of engaging portions provided at different positions in the left-right direction as the positioning portion,
The base portion has a plurality of arrangement regions in the left-right direction for arranging the key unit,
A portion of each of the arrangement regions of the base portion corresponding to one of the plurality of engaging portions of the key unit is engaged with the one engaging portion in the left-right direction. A positioning corresponding portion for restricting the position of the key unit is provided, and portions corresponding to other engaging portions other than the one engaging portion are not engaged with the other engaging portions in the left-right direction. Configured,
A key unit positioning structure characterized in that a position of the positioning corresponding portion in the arrangement area in the left-right direction differs between at least two arrangement areas.   The base portion has an odd number of arrangement regions, and the central arrangement region in the left-right direction has the positioning at a portion corresponding to the engagement portion closest to the center of the key unit among the plurality of engagement portions. The key unit positioning structure according to claim 1, wherein a corresponding portion is provided.   The base portion has an even number of arrangement regions, and each of two arrangement regions adjacent in the center in the left-right direction has an engagement portion closest to the center of the key unit among the plurality of engagement portions. 2. The key unit positioning structure according to claim 1, wherein the positioning corresponding portion is provided in a corresponding portion.   The base portion has an even number of disposition regions, and the left disposition region of two disposition regions adjacent in the center in the left-right direction includes the rightmost portion of the key unit among the plurality of engagement portions. The positioning corresponding portion is provided in a portion corresponding to the engaging portion, and the leftmost engagement in the key unit among the plurality of engaging portions is provided in the right disposition region of the two disposition regions. 2. The key unit positioning structure according to claim 1, wherein the positioning corresponding portion is provided in a portion corresponding to the portion.   In the leftmost arrangement region of the plurality of arrangement regions, the positioning corresponding portion is provided in a portion corresponding to the leftmost engagement portion in the key unit among the plurality of engagement portions, and The positioning corresponding portion is provided in a portion corresponding to the rightmost engagement portion of the key unit among the plurality of engagement portions in the rightmost arrangement region of the plurality of arrangement regions. The positioning structure of the key unit according to any one of claims 1 to 4.

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