JP2006178354A - Exterior structure of keyboard instrument - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To considerably increase variations of models while suppressing die costs by constituting a case structure of trisected cases and making constitution of a plurality of kinds of case structures possible by combinations of the individual cases. <P>SOLUTION: The case structures of a plurality of different kinds are constituted by selecting one among the upper cases UC, UC2, UC3 and one among the rear side upper cases LCr, LCr2, LCr3, for the first kind of the front side lower case LCf, and clamping projecting parts 16, 17 for clamping the upper case UC, screw insertion holes 24, 29 of the front side lower case LCf, and projecting parts 13, 14, 15 for clamping of the upper case UC, and screw insertion holes 40, 38, 34 in a key lining up direction, respectively. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to an exterior structure of a keyboard instrument having a case structure of multiple case coupling type in which a keyboard unit is housed.

Conventionally, as shown in Patent Document 1 below, two types of case structures (housings) are selectively combined with two types of upper cases (upper housings) for a single type of lower case (lower housing). An exterior structure of a keyboard instrument that can constitute a body) is known. In this type of exterior structure, the upper case and the lower case are generally made of resin and are molded by a mold. Then, a screw hole is provided in the upper case, and a corresponding screw hole for fixing the screw is provided in the lower case, and both cases are fixed by screwing from below.
Noto 2545353

  However, in this type of exterior structure, for example, when it is desired to vary the angle of the panel surface of the upper case for each model, an undercut does not occur in a portion of the mold corresponding to the screw pilot hole. In order to achieve this, it is desirable that the screw hole in the upper case be substantially perpendicular to the panel surface. However, when the screw pilot hole is made perpendicular to the panel surface, the angle of the surface of the lower case where the screw head abuts also matches the screw pilot hole angle (perpendicular to the screw pilot hole angle). Since it is desirable to set, after all, it becomes difficult to make the lower case common to each model.

  On the other hand, the lower case screw hole of the upper case is formed in a cross-sectional oblong hole, and by allowing the screw to be diagonally screwed into the lower hole screw hole, various types of upper cases can be formed. It may be possible to selectively assemble a single type of lower case. However, by doing so, the screw is screwed only at the short side portion of the elongated screw pilot hole, and the exposed portion is formed on the screw, so that the fastening rigidity is low, and the screw is not screwed at the time of screwing. Since it is difficult to go straight, the fastening accuracy is also poor. In addition, since a long hole is formed in the mold, machining is not easy as compared with a hole having a circular cross section, and the mold cost increases.

  In addition, when a single lower case is used for all models, even if multiple types of upper cases are provided, the size or plan view shape of the keyboard instrument is almost determined depending on the lower case. From the viewpoint of stability and the like, the depth of the upper case cannot be made particularly long, and it is difficult to manufacture a product having a difference in size between different models.

  For these reasons, if it is assumed that the mold cost is to be kept low, the upper case design is severely limited, and the lower case is shared and only the upper case is replaced for each model. In practice, this is not easy, and the number of models that can be manufactured cannot be increased.

  The present invention has been made to solve the above-described problems of the prior art, and an object of the present invention is to provide an exterior structure of a keyboard instrument that can dramatically increase variations of models while suppressing mold costs. It is in.

  In order to achieve the above object, an exterior structure of a keyboard instrument according to claim 1 of the present invention is an exterior structure of a keyboard instrument having a case structure in which a keyboard unit (KBU) is installed, each of which includes a plurality of first, A front lower case having an upper case (UC) having a second fastening portion and a plurality of first fastening portion corresponding portions (24, 29) corresponding to the plurality of first fastening portions (16, 17) of the upper case. (LCf) and a plurality of second fastening portions disposed below the upper case and behind the front lower case and corresponding to the plurality of second fastening portions (13, 14, 15) of the upper case A rear lower case (LCr) having corresponding portions (40, 38, 34), the plurality of first fastening portions of the upper case, and the plurality of first fastening portion corresponding portions of the front lower case, And fastening the plurality of second fastenings of the upper case. The front lower case and the rear lower case are fixed with respect to the upper case by fastening the portion and the plurality of second fastening portion corresponding parts of the rear lower case, and thereby the case A structure is formed.

  According to this configuration, the case structure is composed of three divided cases, and multiple types of case structures can be configured by combining individual cases, dramatically increasing the number of model variations while reducing mold costs. Can be made.

  Preferably, the front lower case and the rear lower case are connected in an overlapped manner in the front-rear direction, and the keyboard unit is provided in an overlapping portion (CN2) of the front lower case and the rear lower case. A keyboard unit support part (26b) is provided to support the keyboard (claim 2). According to this configuration, the rigidity of the entire case structure is ensured. More preferably, at least one (16) of the plurality of first fastening portions and at least one (15) of the plurality of second fastening portions of the upper case are in the overlapped portion of the upper case. Be placed. Thereby, the keyboard unit is supported at the fastened position, so that the accuracy of attaching the keyboard unit is improved.

  More preferably, the upper case has left and right side portions (12L, 12R) extending in the longitudinal direction of the case structure, and the first fastening portion (16, 17) and the left and right side portions respectively At least one second fastening portion (13) is arranged (claim 3). According to this configuration, since the front lower case and the rear lower case are fixed with the left and right side portions of the upper case as substantial connecting portions, the rigidity in the front-rear direction of the case structure can be increased.

  In order to achieve the above object, an exterior structure of a keyboard instrument according to claim 4 of the present invention includes an upper case, a front lower case that supports the keyboard unit, a lower side of the upper case, and a rear side of the front lower case. A keyboard instrument exterior structure in which a case structure is assembled by assembling a rear lower case disposed on the upper case (UC, UC2, UC3) and the rear lower case (LCr, LCr2, LCr3) ) Are provided in a plurality of types, and the front lower case is provided in a single type (LCf). One type of the upper case and one type of the plurality of types of the rear lower case are provided. A plurality of different types of case structures can be configured by selectively assembling the rear lower case to the front lower case.

  According to this configuration, it is possible to construct multiple types of case structures by selectively assembling the upper case and the rear lower case to the front lower case, dramatically increasing the number of model variations while reducing mold costs. Can be made.

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

  According to the present invention, it is possible to drastically increase the variations of models while suppressing the mold cost.

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

  FIG. 1 is a plan view showing a state where a keyboard unit and an upper case UC are removed from a keyboard instrument to which an exterior structure according to an embodiment of the present invention is applied. FIG. 2 is a bottom view of the keyboard device. 3 is a cross-sectional view taken along line III-III in FIG.

  In the exterior structure of the present embodiment, as shown in FIG. 3, a keyboard device 100 is configured by assembling a resin-made keyboard unit KBU, a front lower case LCf, an upper case UC, and a rear lower case LCr. The The assembly in which the keyboard unit KBU and the front lower case LCf are assembled is hereinafter referred to as “front lower case KBLC with keyboard”. Further, the assembly of the front lower case LCf, the upper case UC, and the rear lower case LCr corresponds to an exterior part in which the keyboard unit KBU is internally provided, and is also referred to as a “case structure”.

  As will be described later, the keyboard device 200 is configured by assembling the upper case UC2 and the rear lower case LCr2 in place of the upper case UC and the rear lower case LCr in the front lower case KBLC with keyboard, as shown in FIG. 11) The keyboard device 300 is configured by assembling the upper case UC3 and the rear lower case LCr3 (FIG. 15). That is, in the present embodiment, the front lower case KBLC with keyboard is shared, and the upper case and the rear lower case having different configurations are selectively assembled so that different types of keyboard devices can be configured. .

  Hereinafter, three keyboard devices 100, 200, and 300 will be exemplified as a plurality of types of keyboard devices. The keyboard device 100 will be described with reference to FIGS. 1 to 10, the keyboard device 200 with reference to FIGS. 11 to 14, and the keyboard device 300 with reference to FIG. Hereinafter, in the description of the keyboard devices 100, 200, 300, the player side of each keyboard device is referred to as the front, and the up, down, left, and right directions are referred to the player.

[Description of Keyboard Device 100]
FIG. 4 is a rear view of the upper case UC. The upper case UC has a U-shape in plan view, and is configured integrally with the main portion 11 and the left and right side portions 12 (12L, 12R). The left and right side portions 12L and 12R are formed over substantially the entire length in the front-rear direction of the keyboard device 100, and the left side portion 12L is composed of a rear half portion 12La and an extending portion 12Lb extending forward from the rear half portion 12La. The right side portion 12R includes a rear half portion 12Ra and an extending portion 12Rb extending forward from the rear half portion 12Ra.

  The upper case UC is provided with a plurality of fastening convex portions 13 to 17 protruding downward, and screwed pilot holes (described later) are formed in these. Four fastening convex portions 13 (13 (1) to 13 (4)) and one fastening convex portion 14 are provided at the rear portion of the upper case UC. The fastening projections 14 are located in the center in the left-right direction, and the fastening projections 13 are distributed in the left-right direction. Two fastening convex portions 15 (15 (1), 15 (2)) are provided at the front portion of the main portion 11. A fastening convex portion 16 is provided at each of the left and right side portions 12L and 12R at the substantially center in the front-rear direction of the upper case UC (16 (1) and 16 (2)). It is located slightly ahead of the fastening projection 15. Further, one fastening protrusion 17 is provided at each of the front portions of the left and right side portions 12L and 12R (17 (1) and 17 (2)).

  Although details will be described later, as shown in FIG. 3, the front lower case LCf and the rear lower case LCr are overlapped and coupled to each other at the intermediate connection portion CN <b> 2 (FIGS. 1 to 3). Further, the rear lower case LCr and the upper case UC are coupled to each other at the rear coupling portion CN1 and the intermediate coupling portion CN2, and the front lower case LCf and the upper case UC are coupled to each other at the middle coupling portion CN2 and the front coupling portion CN3. (See FIG. 10B). The keyboard unit KBU is attached to the front lower case LCf at the intermediate connecting portion CN2.

  FIG. 5 is a perspective view showing how the front lower case LCf and the rear lower case LCr are assembled. In the figure, the bottom surface side of the front lower case LCf and the upper surface side of the rear lower case LCr are visible.

  The front lower case LCf corresponds to the front half of the keyboard device 100. As shown in FIG. 1, two fastening convex portions 28 (28 (1) and 28 (2)) are formed on the left and right sides of the front portion of the front lower case LCf so as to protrude upward. These fastening convex portions 28 are provided at positions corresponding to the fastening convex portions 17 (see FIG. 4) of the upper case UC. Two screw insertion holes 29 (29 (1) and 29 (2)), which are screw holes, are formed in the fastening convex portion 28.

  As shown in FIG. 1 and FIG. 5, two screw insertion holes 23 (23 (1), 23 (2)), 24 ( 24 (1), 24 (2)) are provided, and these screw insertion holes 23, 24 are formed at positions corresponding to the fastening convex portions 15, 16 of the upper case UC.

  On the other hand, the rear lower case LCr corresponds to the second half of the keyboard device 100. As shown in FIG. 5, two fastening projections 33 (33 (1) and 33 (2)) and two fastening projections 35 that protrude upward are formed at the front portion of the rear lower case LCr. (35 (1), 35 (2)) are provided. These fastening convex portions 33 and 35 are provided at positions corresponding to the fastening convex portions 15 and 16 of the upper case UC. The fastening protrusions 33 and 35 correspond to the screw insertion holes 23 and 24 of the front lower case LCf and are screw insertion holes 34 (34 (1) and 34 (2), respectively, which are screw holes. ), 36 (36 (1), 36 (2)). Therefore, the screw insertion holes 34 and 36 correspond to the positions of the screw insertion holes 23 and 24, and the fastening convex portions 15 and 16 also overlap correspondingly.

  Further, as shown in FIG. 5, at the rear portion of the rear lower case LCr, there are four fastening convex portions 39 (39 (1) to 39 (4)) and one fastening convex portion that are formed to project upward. 37 is provided (see also FIG. 6). The fastening convex portions 39 and 37 are provided at positions corresponding to the fastening convex portions 13 and 14 of the upper case UC. Screw insertion holes 40 (40 (1) to 40 (4)) and 38, which are screw holes, are formed in the fastening convex portions 39 (1) to 39 (4) and 37, respectively. .

  6 is a cross-sectional view taken along line VI-VI in FIG. 2, and FIG. 7 is a cross-sectional view taken along line VII-VII in FIG. FIG. 8 is a partially enlarged view of the intermediate coupling portion CN2 shown in FIGS.

  First, paying attention to the intermediate connecting portion CN2, as shown in FIGS. 1, 5, 6, and 7, the rear portion of the front lower case LCf has a bowl-shaped portion that is U-shaped in cross section and recessed downward. 26 is provided. As shown in FIGS. 6 and 7, the bowl-shaped portion 26 mainly includes a rising portion 26a that rises from the rear portion of the bottom plate portion 25 of the front lower case LCf, and a floor covering portion that extends substantially horizontally rearward from the rising portion 26a. 26b and a hanging rib 26c that hangs downward from the rear portion of the floor covering portion 26b. The degree of “substantially horizontal” of the floor portion 26b may be an angle such that the key is substantially horizontal when the key press of the keyboard unit KBU is finished. The “substantially horizontal” includes a wide range excluding “vertical”. Angle is included.

As shown in FIG. 1, six grooves 30 (30 (1) to 30 (6)) through which a flat cable 66 (see FIG. 9), which will be described later, passes are located on the inner side (upper side) of the bowl-shaped portion 26. And is formed along the front-rear direction.

As shown in FIGS. 1 and 7, two ridge-shaped guide rails 27 f and 27 r are formed from the upper surface 26 b 4 of the floor covering portion 26 b over almost the entire key width except for the position of the groove portion 30. Yes. These guide rails 27f and 27r serve as temporary positioning references in the front-rear direction of the common base end 50 of the keyboard unit KBU.

  Each groove part 30 is formed in the shape which crosses the floor covering part 26b formed over a key arrangement direction in a key longitudinal direction (front-back direction). As shown in FIG. 5, when viewed from below, each groove portion 30 is formed to protrude downward as six convex portions 22 corresponding to each groove portion 30. In addition, it is not necessary to pass the flat cable 66 through all of these six grooves 30, so that only the one suitable for the model among the six grooves 30 can be selected and used for passing the flat cable 66. Is provided.

  Further, as shown in FIG. 7, a portion of the floor covering 26b where the screw insertion hole 23 is formed is a contacted portion 26b1, and the floor covering portion 26b1 is located in front of the contacted portion 26b1. A reinforcing rib 26b3 is suspended from the lower surface of 26b. Further, as shown in FIG. 8, a portion of the floor covering portion 26b where the screw insertion hole 24 is formed is a contacted portion 26b2. A lower surface of the contacted portion 26b2 is a contact surface 26b2a having a convex curved surface in a downward contact with the fastening convex portion 35 of the rear lower case LCr. By making the contacted surface 26b2a into a convex curved surface shape, it is possible to prevent the contact portion from being excessively deformed even if the axial direction of the screw 64 is different for each model.

  The abutted surface 26b2a is not a convex curved surface, but a flat surface with a predetermined angle, and the abutting portion 35b of the rear lower case LCr abuts the abutted surface 26b2a at a predetermined angle for each model. You may make it set the angle of the contact part 35b for every model.

  On the other hand, in the rear lower case LCr, the fastening convex portion 33 includes a front wall portion 33a, a contact portion 33b, and a rear wall portion 33c, as shown in FIG. The lower surface of the contact portion 33 b is a contacted surface 33 b 1 that contacts the head of the screw 63. As shown in FIGS. 3 and 8, the fastening convex portion 35 includes a front wall portion 35a, a contact portion 35b, and a rear wall portion 35c. A rising portion 42 rises from the front portion of the bottom plate portion 41 of the rear lower case LCr, and an upper portion of the rising portion 42 extends horizontally forward and is connected to the rear wall portion 35c. The lower surface of the contact portion 35 b is a contacted surface 35 b 1 that contacts the head of the screw 64.

  As shown in FIGS. 5 and 6, a rib 31 is provided in a substantially vertical direction from the front portion of the bottom plate portion 41 of the rear lower case LCr. The rib 31 is configured integrally with the plurality of fastening convex portions 33 and 35, and the fastening convex portions 33 (1) and 33 (2) are provided midway between the fastening convex portions 35 (1) and 35 (2). It extends in the left-right direction, and is formed over substantially the entire width of the rear lower case LCr. The rib 31 is provided with six notches 32 corresponding to the protrusions 22 to avoid interference with the protrusions 22 of the front lower case LCf.

  When the keyboard device 100 is assembled, as shown in FIGS. 3 and 6 to 8, the fastening convex portions 33 and 35 are fitted into the inner portion (concave side portion) of the bowl-shaped portion 26 from below. Become. The contact portion 33b and the contacted portion 26b1 are in contact with each other, and the contact portion 35b and the contacted surface 26b2a of the contacted portion 26b2 are in contact with each other. Further, the contact surface 16b, which is the lower end surface of the fastening convex portion 16 of the upper case UC, comes into contact with the receiving surface 26b2b which is the upper surface of the contacted portion 26b2 (see FIG. 8).

  As shown in FIGS. 6 and 7, the keyboard unit KBU is configured by laminating a plurality of white keys and black keys in three layers in a predetermined (for example, one octave) unit at the common base end portion 50 thereof. It is a thing of the well-known structure. The keyboard unit KBU is attached to the front lower case LCf with the common base end 50 attached to the front lower case LCf, and becomes a front lower case KBLC with a keyboard. The upper surface 51 of the common base end portion 50 has a convex curved surface in a side view, and the fastening convex portion 15 of the upper case UC contacts the upper surface 51 when the keyboard device 100 is assembled. When assembling the keyboard unit KBU to the front lower case LCf, first, the common base end portion 50 is placed on the upper surface 26b4 of the floor covering portion 26b so as to be sandwiched between the guide rails 27f and 27r. The keyboard unit KBU is now temporarily placed, and then the common base end 50 is fixed to the floor covering 26b with a plurality of unillustrated screws, whereby the keyboard unit KBU is supported by the floor covering 26b. A front lower case KBLC is obtained. The front lower case LCf is mounted with various functional components such as a stopper in addition to the board 68 provided with the switch 67 and the like before the keyboard unit KBU is mounted.

  As shown in FIG. 6, the keyboard device 100 is assembled by screwing screws 61, 62, 63, 64, 65 respectively corresponding to the fastening convex portions 13, 14, 15, 16, 17. The upper case UC is provided with a plurality of threaded pilot holes each having a circular cross section corresponding to the screws 61 to 65, and each screw 61 to 65 is rotated to form a female screw in the corresponding screwed pilot hole ( Threaded).

  In the intermediate connection portion CN2, the two screws 63 (1), 63 (2), 64 (1), and 64 (2) are assembled. First, as shown in FIGS. 7 and 8, screwing pilot holes 15 a and 16 a are formed in the fastening convex portions 15 and 16 of the upper case UC, respectively. As shown in FIG. 7, the screw 63 is threaded through the screw insertion holes 34 and 23 and the hole in the common base end portion 50 from below, and is screwed into the screwing lower hole 15 a of the fastening convex portion 15. As a result, the rear lower case LCr, the front lower case LCf, the keyboard unit KBU and the upper case UC are coupled and fixed together. Further, as shown in FIG. 8, the screw 64 is threaded through the screw insertion holes 36 and 24 from below and screwed into the screwing lower hole 16 a of the fastening convex portion 16. As a result, the rear lower case LCr, the front lower case LCf, and the upper case UC are coupled and fixed together in the left and right sides of the keyboard device 100.

  9 is a cross-sectional view taken along line IX-IX in FIG. In the front lower case LCf, six flat cables 66 for electrical wiring are connected to the substrate 68. After the keyboard device 100 is assembled, the corresponding flat cable 66 is inserted into the six groove portions 30 of the rear lower case LCr as shown in the groove portion 30 (1) in FIG. The groove 30 is vertically long, and the flat cable 66 is made parallel to the vertical direction accordingly, and a small space is effectively used.

  FIG. 10A is a partial vertical cross-sectional view of the front side connecting portion CN3, and FIG. 10B is a partial vertical cross-sectional view of the rear side connecting portion CN1.

  In the front connection portion CN3, as shown in FIG. 5A, the fastening projections 17 of the upper case UC are formed with screwing pilot holes 17a. Each fastening convex portion 28 of the front lower case LCf has the screw insertion hole 29 as described above (see FIG. 1), and a receiving surface 28b that comes into contact with the contact surface 17b that is the lower surface of the fastening convex portion 17. , A contact surface 28a having a convex curved surface is provided below the corresponding head of the screw 65.

  At the time of assembling the keyboard device 100, the screw 65 is passed through the screw insertion hole 29 from below and screwed into the screwing lower hole 17 a of the fastening convex portion 17. Thereby, the front lower case LCf and the upper case UC are coupled and fixed at the front portion of the keyboard device 100.

  Further, in the rear connection portion CN1, as shown in FIG. 10 (b), screwing lower holes 13a are formed in the fastening convex portions 13 of the upper case UC. Each fastening convex portion 39 of the rear lower case LCr has the screw insertion hole 40 as described above (see FIG. 1), and a receiving surface 39b that comes into contact with the contact surface 13b that is the lower surface of the fastening convex portion 13. And a contacted surface 39a that contacts the head of the corresponding screw 61. The configuration corresponding to the screw 62 (fastening convex portion 14, fastening convex portion 37, screw insertion hole 38) is basically different from the configuration corresponding to the screw 61 mainly in the vertical direction. Since the configuration is the same, the description thereof is omitted, and in particular, the screwing pilot hole of the fastening projection 14 is the same as the screwing pilot hole 13a, and the illustration thereof is omitted.

  At the time of assembling the keyboard device 100, the screw 61 is threaded through the screw insertion hole 40 from below and screwed into the screwing lower hole 13 a of the fastening convex portion 13. Similarly, the screw 62 is screwed into the screwing pilot hole of the fastening convex portion 14. Thereby, the rear lower case LCr and the upper case UC are coupled and fixed at the rear portion of the keyboard device 100.

  As a procedure for assembling the keyboard device 100, the rear lower case LCr is actually assembled to the front lower case LCf after the keyboard unit KBU is assembled to the front lower case LCf to form the front lower case KBLC with keyboard. . That is, first, the front lower case KBLC with keyboard is configured. Then, the front lower case KBLC with keyboard is placed upside down on the front half of the upper case UC placed upside down, and the rear lower case LCr is placed upside down behind the front lower case KBLC with keyboard. . At that time, the front lower case LCf and the rear lower case LCr are installed so as to overlap at the intermediate connection portion CN2. Then, each of the screws 61 to 65 is screwed into a corresponding screwing pilot hole.

  When the keyboard device 100 is assembled in this manner, as shown in FIGS. 3 and 6 to 8, the hanging rib 26c and the rear wall portion 33c, the rising portion 26a and the front wall portion 35a, and the rising portion 26a and the front wall portion. 33a, the rising portion 26a and the rib 31, the hanging rib 26c and the rear wall portion 35c, the rib 26b3 and the front wall portion 33a, and the hanging rib 26c and the rising portion 42 face each other relatively close to each other. In both cases, the wall portions along the substantially vertical direction are close to each other so that the “lower case” formed by assembling the front lower case LCf and the rear lower case LCr has high horizontal rigidity. In addition, since the fastening convex portions 33 and 35 are fitted inside the hook-shaped portion 26, the rigidity of the lower case in the key arrangement direction is also high. Accordingly, when focusing on the front lower case LCf and the rear lower case LCr, the lower case is divided and configured, but the same strength as that of the integrated lower case is ensured.

[Description of Keyboard Device 200]
FIG. 11 is a cross-sectional view showing the configuration of the keyboard device 200, and corresponds to FIG. The keyboard device 200 is configured by assembling a rear lower case LCr2 different from the rear lower case LCr and an upper case UC2 different from the upper case UC to the front lower case LCf and the keyboard unit KBU common to the keyboard device 100. The The rear lower case LCr2 and the upper case UC2 are coupled at the rear coupling portion CN4 and the intermediate coupling portion CN5, and the front lower case LCf and the rear lower case LCr2 are coupled at the intermediate coupling portion CN5, and the front lower case LCf and The upper case UC2 is coupled to the intermediate coupling part CN5 and the front coupling part CN6.

  FIG. 12 is a partial longitudinal sectional view of the intermediate coupling portion CN5 corresponding to FIG. FIG. 13A is a partial vertical cross-sectional view of the front side connecting portion CN6 and corresponds to FIG. FIG. 13B is a partial vertical cross-sectional view of the intermediate connecting portion CN5 and corresponds to FIG.

  The keyboard device 100 and the keyboard device 200 are common in that the same screws 61 to 65 (see FIG. 2 for the screws 61 and 62) are used as fastening means used for assembly. The upper case UC and the upper case UC2 have different panel surface (upper surface) angles, and accordingly, the angles of the screwing pilot holes corresponding to the screws 61 to 65 are different. That is, in the keyboard device 100, as shown in FIG. 6, the angles of the screwing pilot holes 13a, 15a, 16a, 17a and the screwing pilot holes of the fastening convex part 14 are all θ1, and each screw 61 The angle after -65 is also θ1. Here, θ1 is the forward tilt angle with respect to the vertical direction when the keyboard device 100 is placed on a flat floor.

  On the other hand, in the keyboard device 200, as shown in FIGS. 12, 13A, and 13B, the angles of the screwing pilot holes 215a, 216a, and 217a corresponding to the screwing pilot holes 15a, 16a, and 17a are as follows. θ2. Here, θ2> θ1. Although not shown, the angle of the screwing pilot hole corresponding to the screwing pilot hole 13a and the screwing pilot hole of the fastening convex portion 14 is also θ2. As described above, in the keyboard devices 100 and 200, the angles of all the screwing pilot holes are the same at θ1 and θ2, respectively, so that when the upper case UC and UC2 are respectively molded, an undercut portion does not occur. By using the upper / lower mold detaching operation in the vertical direction, it is possible to easily provide the pilot holes for full screwing.

  As shown in FIGS. 12 and 13 (b), the configuration of the intermediate connecting portion CN5 of the keyboard device 200 is basically the same as that of the keyboard device 100 except for the difference between the angles θ1 and θ2, and the fastening protrusion Parts 215, 216, contact surface 216b, fastening convex part 233, front wall part 233a, contact part 233b, rear wall part 233c, contacted surface 233b1, screw insertion hole 234, fastening convex part 235, front wall The portion 235a, the contact portion 235b, the rear wall portion 235c, and the contacted surface 235b1 are the fastening convex portions 15 and 16, the contact surface 16b, the fastening convex portion 33, the front wall portion 33a, and the keyboard device 100, respectively. Similar to the abutting portion 33b, the rear wall portion 33c, the abutted surface 33b1, the screw insertion hole 34, the fastening convex portion 35, the front wall portion 35a, the abutting portion 35b, the rear wall portion 35c, and the abutted surface 35b1. Composed. Further, as shown in FIG. 13 (a), the configuration of the front side connecting portion CN6 of the keyboard device 200 is basically the same as that of the keyboard device 100 except for the difference between the angles θ1 and θ2, and is a fastening convex portion. 217 and the contact surface 217b are configured similarly to the fastening convex portion 17 and the contact surface 17b in the keyboard device 100, respectively.

  First, referring to FIGS. 7 and 12, first, the keyboard device 100 and the keyboard device 200 share the same front lower case LCf and keyboard unit KBU, but the angles of the screwing pilot holes 15a and 215a are different. ing. Accordingly, the fastening convex portion 15 of the upper case UC and the fastening convex portion 215 of the upper case UC2 are in contact with the upper surface 51 of the common base end portion 50 at different positions. However, since the upper surface 51 is a convex curved surface when viewed from the side, both are in good contact with the upper surface 51. Further, both the abutted surfaces 33b1 and 233b1 are formed at an angle so as to properly abut the surface of the head of the screw 63 when the screw 63 is screwed into the screwing pilot holes 15a and 215a, respectively. Such a setting is possible because the rear lower case LCr and the rear lower case LCr2 are molded separately. Therefore, in any model, the screw 63 can be appropriately fastened while sharing the front lower case KBLC with keyboard.

  Next, referring to FIGS. 10A and 13A, since the front lower case LCf is common between the keyboard devices 100 and 200, the angle or shape of the receiving surface 28b is also common. Therefore, in the upper case UC2 of the keyboard device 200, the contact surface 217b of the fastening convex portion 217 is formed so as to be in surface contact with the receiving surface 28b in the same manner as the contact surface 17b of the fastening convex portion 17. ing. Further, since the screwing pilot holes 17a and the screwing pilot holes 217a have different angles, when the screws 65 are screwed into the screwing pilot holes 17a and 217a in the keyboard devices 100 and 200, respectively, The contact position with respect to the contacted surface 28a is different. However, as described above, since the abutted surface 28a has a convex curved surface shape, the abutting state is better than the case where the abutted surface 28a is a flat surface. Accordingly, in any model, the screw 65 can be appropriately fastened while sharing the front lower case LCf.

  Next, referring to FIG. 8 and FIG. 13 (b), since the front lower case LCf is common between the keyboard devices 100 and 200, the angles of the contacted portion 26 b 2 and the receiving surface 26 b 2 b are also common. Therefore, first, in the upper case UC2 of the keyboard device 200, the contact surface 216b of the fastening convex portion 216 is formed so as to be in surface contact with the receiving surface 26b2b in the same manner as the contact surface 16b of the fastening convex portion 16. Has been. Further, in the rear lower case LCr2, the abutted surface 235b1 is appropriately abutted against the head of the screw 64 when the screw 64 is screwed into the screwing lower hole 216a, like the abutted surface 35b1. It is formed at an angle that makes contact. Further, since the abutted surface 26b2a is a convex curved surface, the abutting state between the abutting portion 235b of the fastening convex portion 235 and the abutted surface 26b2a is as good as in the keyboard device 100. is there. Therefore, in any model, the screw 64 can be appropriately fastened while sharing the front lower case LCf.

  By the way, although the structure of the fastening part in the rear side connection part CN4 is not shown in the figure, this part is a part for joining and fastening the upper case UC2 and the rear lower case LCr2, so the fastening angle of the screws 61 and 62 is The angle or shape of the contact portion or the like can be designed independently of the keyboard device 100 in accordance with θ2 that is. Therefore, it is possible to achieve appropriate fastening of the screws 61 and 62 without any special measures.

  FIG. 14 is a partial vertical cross-sectional view of the rear connection part CN4 of the keyboard device 200. Unlike the keyboard device 100, the keyboard device 200 is provided with a packing 69. The packing 69 is provided so as to cover the rear edge 70 of the rear lower case LCr2, and the upper case UC2 covers the packing 69 from the outside of the rear edge 70. Thereby, in the keyboard device 200, noise due to vibration, chatter, etc. when a musical sound is generated is suppressed.

[Description of Keyboard Device 300]
FIG. 15 is a cross-sectional view showing the configuration of the keyboard device 300, and corresponds to FIG. The keyboard device 300 is configured by assembling a rear lower case LCr3 different from the rear lower case LCr and an upper case UC3 different from the upper case UC to the front lower case LCf and the keyboard unit KBU common to the keyboard device 100. The The rear lower case LCr3 and the upper case UC3 are coupled at the rear coupling portion CN7 and the intermediate coupling portion CN8, and the front lower case LCf and the rear lower case LCr3 are coupled at the intermediate coupling portion CN8, and the front lower case LCf and The upper case UC3 is coupled at the intermediate coupling portion CN8 and the front coupling portion CN9.

  As with the keyboard device 200, the keyboard device 100 differs in the angle of the screwing pilot holes corresponding to the screws 61 to 65 as fastening means used for assembly (angle θ3). Even in the structure corresponding to each of the screws 61 to 65, such as the provision of the fastening convex portion 335 corresponding to the portion 35, the angle or shape of the contact portion or the like is adjusted to the angle θ3 so that the contact is appropriate. Designed. In particular, in the keyboard device 300, the speaker 71 is provided in the rear part of the upper case UC3 and the rear lower case LCr3. The front and rear lengths are short and the appearance is significantly different from the keyboard devices 100 and 200. It has become.

  According to the present embodiment, the case structure for housing the keyboard unit KBU is constituted by a three-divided case, and the front lower case KBLC with a single kind of keyboard comprising the front lower case LCf and the keyboard unit KBU. On the other hand, a plurality of types of case structures are configured by selectively attaching one of the rear lower cases LCr, LCr2, and LCr3 and one of the upper cases UC, UC2, and UC3. Because of the common use of the front lower case KBLC with keyboard, the variation of the model is drastically suppressed while reducing the mold cost compared to the case where the upper case and the lower case are different for each model as in the conventional case structure. Can be increased. For example, not only the front lower case KBLC with keyboard is shared among models having different panel surface angles of the upper case, but also the upper lower case LCr3 together with the lower lower case LCr3 with respect to the keyboard device 100 as exemplified by the keyboard device 300. By changing the case UC3, it is possible to share the front lower case KBLC with keyboard with respect to a keyboard device having completely different depth dimensions and external shapes. The front-rear length and the plan view shape of the keyboard device 100 are not dependent on the front lower case LCf, and there are few restrictions.

  In addition, as described with reference to the keyboard device 100 in FIGS. 1 to 10, in the upper case UC, among the plurality of screwing holes, the screwing holes 13 a, 16 a, and 17 a are both left and right side portions 12 </ b> L. , 12R, the front lower case LCf and the rear lower case LCr are fixed with the left and right side portions 12L, 12R of the upper case UC extending substantially in the longitudinal direction of the keyboard device 100 as substantial connecting portions. Therefore, the rigidity in the front-rear direction of the case structure after assembly can be increased.

  Further, as described with the keyboard device 100 as an example, when the case structure is configured by assembly, the floor portion 26b of the bowl-shaped portion 26 of the front lower case LCf is in contact with the contact portion 33b of the rear lower case LCr. , 35b, and the common base end portion 50 of the keyboard unit KBU is substantially supported by the floor covering portion 26b. That is, the keyboard unit support part that supports the keyboard unit KBU does not depend on the rear lower case LCr or the upper case UC, but only belongs to the front lower case LCf. Therefore, in the keyboard unit KBU that requires high accuracy, it is difficult for accuracy failure to occur due to the assembly of the keyboard device 100.

  In addition, the floor portion 26b is located at the intermediate connection portion CN2, that is, the portion where the front lower case LCf and the rear lower case LCr overlap, and is brought into contact with the contact portions 33b and 35b at the overlap position. In this state, the screws 63 and 64 are screwed and fixed to the screwing lower holes 15a and 16a of the upper case UC. As a result, the strength of the intermediate connecting portion CN2 that is a connecting portion between the front lower case LCf and the rear lower case LCr can be increased, and the rigidity of the entire case structure due to the fact that the lower case is separated into two parts is reduced. Can be resolved. In addition, since the keyboard unit KBU is supported near the place fastened with the screws 63 and 64 (floor portion 26b), the mounting accuracy of the keyboard unit KBU is improved and the accuracy of the keyboard unit KBU is poor. Can be resolved.

  Further, according to the present embodiment, when the case structure is configured by assembling, the wall portions along the substantially vertical direction such as the hanging rib 26c of the front lower case LCf and the rear wall portion 33c of the rear lower case LCr are arranged. Since they are close to each other, the strength of the lower case (front lower case LCf and rear lower case LCr) after assembly is mainly increased in the front-rear direction. In addition, since the fastening convex portions 33 and 35 are fitted into the flange-like portion 26, the rigidity in the key arrangement direction as well as the front-rear direction of the lower case is high. Therefore, in the case structure formed by combining the cases separated into three, the lower case can be increased in bonding strength to ensure high rigidity of the case structure.

  Further, since the fastening at the intermediate connecting portion CN2 is a joint fastening of the front lower case LCf, the rear lower case LCr, and the upper case UC, the number of parts can be reduced.

  Furthermore, the guide rails 27f and 27r provided on the floor portion 26b abut against the common base end 50 of the keyboard unit KBU and serve as a temporary positioning reference in the front-rear direction of the common base end 50, so that the keyboard unit KBU is assembled. Not only is the operation easier, but the guide rails 27f and 27r are protrusions along the key arrangement direction, which leads to an improvement in rigidity of the lower case in the key arrangement direction.

  In addition, the bottom plate portion 25 of the front lower case LCf and the bottom plate portion 41 of the rear lower case LCr are flush with each other. It is recognized as one. Furthermore, since the bowl-shaped portion 26 has a U-shape that is open downward, a plurality of ribs such as ribs 26b3 and ribs 31 are present on the inside thereof. It is difficult for foreign objects such as clips to get inside.

  As described above, multi-model production is possible with a combination of the rear lower case LCr and the upper case UC, and the configurable models are not limited to the three types of keyboard devices 100, 200, and 300 exemplified. Absent.

  The floor portion 26b that directly supports the keyboard unit KBU is provided in the front lower case LCf. However, in terms of maintaining the accuracy of the keyboard unit KBU, the opposite structure may be used. That is, a floor portion is provided in the rear lower case LCr, and contact portions corresponding to the contact portions 33b and 35b corresponding to the floor portion are provided in the front lower case LCf, and the rear portion is placed on the contact portion. The floor covering part of the lower side case LCr may be overlapped.

  In terms of the provisional positioning reference function of the common base end 50 of the keyboard unit KBU, the configuration may not be a ridge like the guide rails 27f and 27r. It may be something like this. Moreover, either one of the guide rails 27f and 27r may be used.

  In addition, you may include the convex part 16 for fastening not only in the 1st fastening part in Claim 1 but in a 2nd fastening part.

It is a top view which shows the state which removed the keyboard unit and the upper case of the keyboard instrument to which the exterior structure which concerns on one embodiment of this invention is applied. It is a bottom view of the keyboard apparatus. It is sectional drawing which follows the III-III line of FIG. It is a reverse view of an upper case. It is a perspective view which shows the mode of an assembly | attachment with a front lower case and a rear lower case. It is sectional drawing which follows the VI-VI line of FIG. It is sectional drawing which follows the VII-VII line of FIG. It is the elements on larger scale of the intermediate | middle connection part shown in FIG. 2, FIG. It is sectional drawing which follows the IX-IX line of FIG. It is the partial longitudinal cross-sectional view (figure (a)) of a front side connection part, and the partial vertical cross-sectional view of a rear side connection part. It is sectional drawing corresponding to FIG. 3 which shows the structure of a keyboard apparatus. It is a fragmentary longitudinal cross-sectional view of the intermediate | middle connection part corresponding to FIG. FIG. 10 is a partial vertical cross-sectional view (FIG. (A)) of the front connection portion corresponding to FIG. 10 (a), and a partial vertical cross-sectional view (FIG. (B)) of the intermediate connection portion corresponding to FIG. It is a fragmentary longitudinal cross-sectional view of the rear side connection part of a keyboard apparatus. It is sectional drawing corresponding to FIG. 3 which shows the structure of a keyboard apparatus.

Explanation of symbols

  KBU keyboard unit, LCf front lower case, LCr, LCr2, LCr3 rear lower case, UC, UC2, UC3 upper case, KBLC front lower case with keyboard, CN2, CN5, CN8 intermediate connection (overlapping part), 12L 12R Left and right side portions 13, 14, 15 Fastening convex portion (second fastening portion), 13a, 15a, 16a, 17a Threaded pilot hole, 16, 17 Fastening convex portion (first fastening portion), 24, 29 Screw insertion hole (first fastening part corresponding part), 26 bowl-like part, 26b floor covering part (keyboard unit support part), 33, 35 fastening convex part (coupling convex part), 38, 34, 40 screw insertion Hole (second fastening part corresponding part), 100, 200, 300 Keyboard device

Claims (4)

An exterior structure of a keyboard instrument having a case structure in which a keyboard unit is installed,
An upper case having a plurality of first and second fastening portions,
A front lower case having a plurality of first fastening portion corresponding portions corresponding to the plurality of first fastening portions of the upper case;
A rear lower case disposed below the upper case and behind the front lower case and having a plurality of second fastening portion corresponding portions corresponding to the plurality of second fastening portions of the upper case. ,
The plurality of first fastening portions of the upper case and the plurality of first fastening portion corresponding portions of the front lower case are fastened, and the plurality of second fastening portions of the upper case and the rear lower case By fastening the plurality of second fastening part corresponding parts, the front lower case and the rear lower case are fixed to the upper case, thereby forming the case structure. Characteristic keyboard instrument exterior structure.   The front lower case and the rear lower case are connected in an overlapped manner in the front-rear direction, and a keyboard unit support that supports the keyboard unit is provided on the overlapping portions of the front lower case and the rear lower case. 2. The exterior structure of a keyboard instrument according to claim 1, wherein a portion is provided.   The upper case has left and right side portions extending over the longitudinal length of the case structure, and at least one of the first fastening portion and the second fastening portion is disposed on each of the left and right side portions. The exterior structure of a keyboard instrument according to claim 1 or 2. A keyboard in which a case structure is constructed by assembling an upper case, a front lower case that supports the keyboard unit, and a rear lower case that is disposed below the upper case and behind the front lower case The exterior structure of the instrument,
While providing a plurality of types of the upper case and the rear lower case,
Provide only a single type of the lower front case,
By selectively assembling one type of upper case among the plurality of types of upper cases and one type of rear lower case among the plurality of types of rear lower cases, respectively, to the front lower case, An exterior structure of a keyboard instrument characterized in that a plurality of different types of case structures can be constructed.

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