JP6123827B2 - Keyboard device - Google Patents

Description

  The present invention relates to a keyboard device in which a plurality of key units, each having a rear end of a plurality of keys connected to a long common mounting portion extending in the left-right direction, are placed and fixed on a key frame. About.

  2. Description of the Related Art Conventionally, a keyboard device in which a plurality of key units integrally formed of resin is assembled to a key frame is well known. The plurality of key units are provided between the plurality of keys extending in the front-rear direction and arranged in parallel in the left-right direction, and the rear ends of the plurality of keys and the common mounting portion, and the plate surface is leveled. And a plurality of flat hinges. In the following Patent Documents 1 and 2, a first key unit having a plurality of white keys with pitch names D, F, and A, and a second key unit having a plurality of white keys with pitch names C, E, G, and B, And a third key unit having a plurality of black keys of pitch names C #, D #, F #, G #, and A #, which are stacked in this order at the common attachment portion and mounted on the rear end portion of the key frame. The first to third key units are fixed on the rear end portion of the key frame with male screws.

  In such first to third key units, the hinge portion is largely elastically deformed when the white key and the black key are pressed and released, and the front end of the white key and the black key. And a thin hinge part that allows the part to swing in the vertical direction. And, the front end of the hinge thick part is connected to the rear surface of the white key and black key integrally, and the front end of the hinge thin part is connected to the rear end of the hinge thick part and the rear end of the hinge thin part is attached in common. Connected to the front of the unit. In particular, in a third key unit having a plurality of black keys positioned at the top of the first to third key units, the width in the left-right direction of each hinge thick portion is set to the left-right direction at the rear end of each black key. A pair of thin hinge portions that are configured to be larger than the width of the hinge thick portion and have the same width in the left and right directions from the rear surface at both ends in the left and right direction of the thick hinge portion are provided to extend backward with a gap therebetween. ing. The left and right outer edges of the hinge thick part and the left and right outer edges of the pair of hinge thin parts are almost at the same position in the left and right direction, and a very small gap is provided between the hinge thick parts corresponding to the adjacent black keys. It has been.

JP 2002-62876 A JP 2005-92233 A

  In the above keyboard device, in the state where the rear cover is slightly behind the white key and the black key with the upper cover, a very small gap is provided between the thick wall portions of the adjacent black keys. Therefore, the thick-walled portions of the second and third key units having white keys do not stand out from above, and the appearance is good.

  However, the pair of hinge thin portions are located at both outer ends of the hinge thick portion, and the distances between the plurality of black keys are different. It is not uniform with respect to the black key and is not symmetrical with respect to the center position of the black key in the left-right direction. Thereby, in the rigidity (elasticity) of the hinge thin part and the hinge thick part in the left and right direction of the black key, a difference occurs between a plurality of black keys, or a difference in the left and right direction of one black key occurs. In particular, this phenomenon is remarkable when the width of the hinge thick portion in the front-rear direction is small or the difference in the length of the hinge thick portion in the left-right direction is large. As a result, there is a problem that the key touch feeling at the time of pressing and releasing keys differs among a plurality of black keys, or the balance in the left and right direction of one black key is shifted, which deteriorates the key touch feeling. Further, due to the deviation of the balance in the left-right direction, there is a problem that the hinge thin portion and the hinge thick portion are twisted, and the durability of the hinge portion is deteriorated.

  The present invention has been made to cope with such problems, and an object of the present invention is to provide a keyboard device that has a good appearance and a good touch feeling. In the description of each constituent element of the present invention below, the reference numerals of corresponding portions of the embodiment are shown in parentheses in order to facilitate understanding of the present invention. The present invention should not be construed as being limited to the configurations of the corresponding portions indicated by the reference numerals of the forms.

In order to achieve the above-described object, the present invention is characterized by a plurality of keys (31, 41, 51) extending in the front-rear direction and arranged in parallel in the left-right direction, and a length extending in the left-right direction. A plurality of flat hinge portions (32, 42) that are respectively provided between the common common mounting portions (33, 43, 53) and the rear ends of the plurality of keys and the common mounting portions, and the plate surfaces are horizontal. , 52), and a plurality of key units (30, 40, 50) that are integrally molded, and a common mounting portion of the plurality of key units is placed on the key frame and fixed. In the apparatus, a plurality of hinge portions in each key unit are formed in a substantially rectangular and flat shape that is thick in the vertical direction and long in the horizontal direction, and is connected to the rear surface of one key at the front end. The thick part and the center position in the left-right direction is the one key The hinge thick part (32a, 42a, 52a) that is aligned with the center position in the left-right direction, and is formed thin in the vertical direction, is connected to the rear surface of the hinge thick part, and is connected to the front surface of the common mounting part. Each of the key units includes a thin hinge portion (32b, 32c, 42b, 42c, 52b, 52c) arranged symmetrically with respect to the center position in the left-right direction of the one key. For each of the plurality of hinges, the thickness of the hinge thick part, the length in the front-rear direction, and the width in the left-right direction are the same, and the thickness of the hinge thin part in the vertical direction and the length in the front-rear direction and a width in the lateral direction of the same, respectively, in the key unit (50) that the common mounting portion is located on the top among the plurality of the key unit, on at least one of the left and right direction of the both outer ends of the hinge thick portions Protrusion protruding on the side (52 d, 52e) and is provided, adjacent to reduce the lateral direction of the gap between the protrusions or the hinge thick portion, and a longitudinal width of the projecting portion of the hinge thick portions A key unit having a common attachment portion that is smaller than the width in the front-rear direction, the rear end of the projecting portion is positioned forward of the rear end of the thick-walled hinge portion, and is located below the uppermost common attachment portion ( 30, 40) a part of the upper surface of the hinge thick part is located behind the protrusion between the pair of adjacent hinge thick parts of the key unit where the common attachment part is located at the uppermost stage. is there.

In this case, the said hinge thin part consists of a pair of hinge thin part respectively connected to the rear surface in the both outer side edge part of the left-right direction of a hinge thick part, for example. Further, for example, the plurality of keys included in each key unit is only a white key or only a black key.

  In the above-mentioned feature of the present invention, a protruding portion that protrudes outward is provided on at least one of both outer ends in the left-right direction of the hinge thick portion of the key unit where the common mounting portion is located at the uppermost stage, and the adjacent protruding portion or hinge The gap in the left-right direction between the thick part was made small. As a result, even if the distances between the plurality of keys are different, the gap between adjacent keys in the vicinity of the rear of the plurality of keys can be minimized regardless of the hinge thick portion. As a result, the hinge portion of the key unit having the common attachment portion positioned below the uppermost common attachment portion can be made inconspicuous from above, and slightly behind the rear position from the rear end of the key. In the state covered with the cover, the appearance is good.

Further, in the feature of the present invention, the plurality of hinge portions in each key unit are formed in a substantially rectangular shape and a flat plate shape that is thick in the vertical direction and long in the horizontal direction, and one key is formed at the front end. A hinge thick part connected to the rear surface, wherein the hinge thick part is formed so that the center position in the left-right direction coincides with the center position in the left-right direction of the one key, and is formed thin in the vertical direction. And a thin hinge portion connected to the front surface of the common attachment portion, wherein the thin hinge portion is arranged symmetrically with respect to the center position in the left-right direction of the one key. , For each key unit, in the plurality of hinge portions, the thickness of the hinge thick portion in the vertical direction, the length in the front-rear direction and the width in the left-right direction are the same, and the thickness of the hinge thin portion in the vertical direction, Adjust the length in the front-rear direction and the width in the left-right direction. Each was the same. According to this, there is a difference between the plurality of keys in the rigidity (elasticity) of the hinge thin wall portion and the hinge thick wall portion in the left-right direction of the key included in each key unit , or in the left-right direction of one key. It is possible to eliminate the occurrence of a difference. As a result, the key touch feeling at the time of pressing and releasing keys can be made the same for a plurality of keys, and the deviation of the balance in the horizontal direction of one key can be eliminated, and the key touch feeling can be improved. . Further, by eliminating the left-right balance deviation, the hinge thin part and the hinge thick part are not twisted, and the durability is improved. Furthermore, the hinge thin part can be placed at any position in the left-right direction of the hinge thick part. As a result, the lateral rigidity of the hinge thin part and hinge thick part is appropriate according to the width of the hinge thick part in the front-rear direction. The hinge thin portion can also be provided at a position (for example, a position where the rigidity is maximum).

Furthermore, in the features of the present invention, in the plurality of hinge portions of the key unit in which the common attachment portion is located at the uppermost stage, the width in the front-rear direction of the protruding portion is made smaller than the width in the front-rear direction of the hinge thick portion, The rear end of the protruding portion is positioned in front of the rear end of the hinge thick portion, and a part of the upper surface of the hinge thick portion of the key unit having the common attachment portion located below the uppermost common attachment portion , The common attachment portion was positioned behind the protruding portion between a pair of adjacent thick hinge portions of the key unit having the uppermost position .

Thereby, in the above-mentioned feature of the present invention, a part of the upper surface of the hinge thick wall portion in the key unit having the common mounting portion positioned below the uppermost common mounting portion is provided with the common mounting portion positioned at the uppermost stage. It does not overlap with the hinge thick part and protrusion of the key unit. Therefore, in the integral molding of the key unit having the common mounting portion located below the uppermost common mounting portion, if a gate corresponding portion for injecting resin into the mold is provided on a part of the upper surface of the thick hinge portion Even if a gate mark (protrusion) remains at the position of the gate corresponding portion after molding, there is no problem in assembling the plurality of key units. Further, by injecting resin at the position of the gate corresponding portion, the resin can be uniformly and smoothly poured into the front portion (ie, key) and rear portion (ie, common mounting portion) of the key unit, such as a weld line. Thus, the key unit having the common mounting portion located below the uppermost common mounting portion can be integrally molded well.

1 is a schematic perspective view of a keyboard device including a key for one octave according to an embodiment of the present invention. It is a top view of the keyboard apparatus of FIG. (A) is a top view of the keyboard apparatus in the state which removed the upper cover in the keyboard apparatus of FIG. 1, (B) is a side view of the keyboard apparatus of (A). (A) is a top view of the 1st key unit in the keyboard apparatus of FIG. 1 thru | or FIG. 3, (B) is a side view of the said 1st key unit. (A) is a top view of the 2nd key unit in the keyboard apparatus of FIG. 1 thru | or FIG. 3, (B) is a side view of the said 2nd key unit. (A) is a top view of the 3rd key unit in the keyboard apparatus of FIG. 1 thru | or FIG. 3, (B) is a side view of the said 3rd key unit. (A) is a partially enlarged plan view of FIG. 3 (A), and (B) is an enlarged cross-sectional view taken along line bb of (A).

  Hereinafter, an embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a schematic perspective view of a keyboard device including a key for one octave according to one embodiment, and FIG. 2 is a plan view of the keyboard device. FIG. 3A is a plan view of the keyboard device with the upper cover removed in the keyboard device, and FIG. 3B is a side view of the keyboard device of FIG. In this specification, the player side (the lower left side in FIG. 1 and the lower side in FIG. 2) is the front side of the keyboard device, and the side opposite to the performer (the upper right side in FIG. 1 and the upper side in FIG. 2) is the keyboard. Be behind the device. The left / right direction of the player (from the upper left to the lower right in FIG. 1 and the left / right direction in FIG. 2) is defined as the left / right direction of the keyboard device.

  The keyboard device has a key frame 10 fixed in the keyboard instrument below the keyboard. The key frame 10 is a flat plate member that is integrally formed of metal, resin, or the like and extends horizontally in the left-right and front-back directions. A plurality of support portions 11 and 12 are respectively provided at appropriate positions in the left and right direction (in the present embodiment, three positions of the left and right end portions and the intermediate portion) at the middle and rear ends in the front and rear direction of the key frame 10. Is provided. The support portions 11 and 12 are formed integrally with the key frame 10 in a columnar shape, and protrude upward from the upper surface of the key frame 10. The electric circuit board 20 is placed on the upper surfaces of the support portions 11 and 12 and fixed by a male screw (not shown), and the upper surface of the support portion 12 is first to third described later in detail in addition to the electric circuit board 20. The key units 30, 40, and 50 are also placed and fixed by male screws (not shown). The support portions 11 and 12 are provided with screw holes extending downward from the upper surfaces thereof. A through hole (not shown) through which the male screw penetrates is also provided in each of the left and right positions corresponding to the support portions 11 and 12 at the front end portion and the rear end portion of the electric circuit board 20.

  The electric circuit board 20 is integrally formed of a resin or the like in a flat plate shape, and a key switch (for example, a rubber dome switch), an electric circuit component, etc. (not shown) are arranged on the upper surface. Note that the electric circuit components may be arranged on the lower surface of the electric circuit board 20. A long felt extending in the left-right direction on the lower surface of the front end portion of the electric circuit board 20 and at the front position of the support portion 11 so as to alleviate the collision with the white keys 31, 41 and the black key 51. A buffer material 21 such as is attached. The electric circuit board 20 and the buffer material 21 restrict the upward displacement of the front end portions of the white keys 31, 41 and the black key 51 when the white keys 31, 41 and the black key 51 are released.

  A portion of the key frame 10 located slightly forward of the support portion 11 is displaced downwardly from the front end portions of the white keys 31, 41 and the black key 51 when the white keys 31, 41 and the black key 51 described later are depressed. There is provided a lower limit stopper portion 13 that regulates the above. The lower limit stopper 13 protrudes upward in a U shape so that the front end is slightly lower than the rear end, and extends in the left-right direction and is formed integrally with the key frame 10. A cushioning material 14 such as a long felt extending in the left-right direction is attached to the upper surface of the lower limit stopper portion 13 in order to alleviate the collision with the white keys 31, 41 and the black key 51. An upper cover 15 extending in the left-right direction is provided above the rear end portion of the key frame 10. The upper cover 15 covers the rear end portions of the first to third key units 30, 40, 50 (parts slightly rearward from the rear ends of the white keys 31, 41 and the black key 51), and has an appearance. It is a member for keeping good.

  Next, the 1st key unit 30 is demonstrated using the top view of FIG. 4 (A), and the side view of FIG. 4 (B). The first key unit 30 has four white keys 31 that are not adjacent to each other corresponding to the pitch names C, E, G, and B, respectively. The white key 31 is composed of an upper wall, a front wall, left and right side walls, and a rear wall, and forms a rectangular space with the inside opened downward. Steps are provided on the upper wall and the left and right side walls to secure a space for the black key 51.

  An engaging piece 31a is formed integrally with the white key 31 at an intermediate position in the front-rear direction on the lower surface of the white key 31 and having a protruding portion that protrudes rearward at the lower end portion. ing. The lower surface of the engagement piece 31 a abuts against the cushioning material 14 when the white key 31 is depressed, and restricts the downward displacement of the front end portion of the white key 31. The rearward protruding portion of the engaging piece 31 a abuts the upper surface of the engaging piece 31 a against the cushioning material 21 when the white key 31 is released, thereby restricting the upward displacement of the front end portion of the white key 31. A pressing portion 31b that presses the key switch when the white key 31 is pressed is provided at an intermediate position in the front-rear direction on the lower surface of the white key 31 that faces the key switch provided on the electric circuit board 20. It has been.

  The rear walls of these four white keys 31 are connected to a common attachment portion (rail portion) 33 via a hinge portion 32, respectively. The hinge part 32 and the common attachment part 33 are integrally formed with the white key 31. The hinge part 32 includes a hinge thick part 32a and a pair of hinge thin parts 32b and 32c. The hinge-thick portion 32a is relatively thick in the vertical direction and is formed in a substantially rectangular and flat shape that is long in the left-right direction, and is configured to reduce the amount of elastic deformation in the vertical direction. The white key 31 is connected to the lower end of the rear surface of the rear wall. The center position in the left-right direction of the hinge thick part 32 a is the same as the center position in the left-right direction of the front end portion of the white key 31. The width of the hinge thick portion 32a in the left-right direction is substantially equal to the width in the left-right direction of the front end portion of the white key 31 (strictly speaking, it is slightly smaller than the width in the left-right direction of the front end portion of the white key 31). The left and right ends of the thick portion 32 a are positioned substantially the same as the left and right ends of the front end portion of the white key 31. A gate position for injecting resin when the first key unit 30 is integrally molded is located on the upper surface of each thick hinge portion 32a at the substantially central position in the left-right direction at the rear end portion of the white key 31. The gate corresponding part 32a1 is provided.

  The thin hinge portions 32b and 32c are thin in the vertical direction compared to the thick hinge portion 32a and are formed in a rectangular and flat plate shape in which the length in the left-right direction is slightly larger than the length in the front-rear direction, and elastic deformation in the vertical direction. The front end is connected to the lower end portion of the rear surface at the outer end portion in the left-right direction of the hinge thick portion 32a. The left end of the hinge thin portion 32b is substantially the same position as the left end of the front end portion of the white key 31 (the same position as the left end of the hinge thick portion 32a), and the right end of the hinge thin portion 32b is the left-right direction of the front end portion of the white key 31 It is located to the left by a predetermined distance from the center. The right end of the hinge thin portion 32c is substantially the same position as the right end of the front end portion of the white key 31 (the same position as the right end of the hinge thick portion 32a), and the left end of the hinge thin portion 32c is the left-right direction of the front end portion of the white key 31 It is located to the right by the predetermined distance from the center of. That is, the thin hinge portions 32b and 32c are provided at predetermined positions at symmetrical positions with respect to the center in the left-right direction of the front end portion of the white key 31. In addition, regarding the positional relationship between the hinge thin portions 32b and 32c and the hinge thick portion 32a, the lateral width of the hinge thin portions 32b and 32c and the hinge thick portion 32a depends on the width in the front-rear direction of the hinge thick portion 32a. The hinge thin portions 32b and 32c may be provided at a position where the rigidity is appropriate (for example, a position where the rigidity is maximized).

  The common attachment portion 33 is a member that is long in the left-right direction and has a longitudinal section in the front-rear direction that is substantially rectangular, and the rear ends of the hinge thin portions 32b, 32c are connected to the upper part of the front surface. The common attachment portion 33 has a concave portion 33a extending in the left-right direction on the lower surface and a convex portion 33b extending in the left-right direction on the upper surface. On the lower surface of the common mounting portion 33, protrusions 33c that protrude downward are provided at appropriate locations in the left-right direction (in this embodiment, three locations, both end portions in the left-right direction and an intermediate portion). The protrusion 33c is formed in a cylindrical shape with a chamfered lower end, and is press-fitted into a hole (not shown) provided in the electric circuit board 20 when the common attachment portion 33 is assembled to the rear end portion of the electric circuit board 20. A through hole 33d is provided at an appropriate position in the left-right direction in the common attachment portion 33 (one place in the middle in the left-right direction in the present embodiment). The through-hole 33d is formed in a circular shape, and presses a later-described protrusion 43c provided on the second key unit 40 when the second key unit 40 is assembled on the first key unit 30. A through hole 33e is also provided at a position in the left-right direction corresponding to the support portion 12 of the key frame 10 in the common attachment portion 33. The through-hole 33e is formed in a circular shape having a slightly larger diameter than the through-hole 33d, and allows a male screw (not shown) to pass through when the first to third key units 30, 40, 50 are assembled to the key frame 10. Furthermore, projecting pieces 33 f projecting downward are also provided at appropriate locations in the left-right direction on the lower surface of the common mounting portion 33 (two locations in the middle in the left-right direction in this embodiment). The projecting piece 33f is inserted into a through-hole (not shown) provided in the electric circuit board 20 with a slight gap when the common mounting portion 33 is assembled to the rear end portion of the electric circuit board 20 to perform a guide function.

  Next, the 2nd key unit 40 is demonstrated using the top view of FIG. 5 (A), and the side view of FIG. 5 (B). The second key unit 40 has three white keys 41 that are not adjacent to each other corresponding to the pitch names D, F, and A, respectively. The white key 41 is also composed of an upper wall, a front wall, left and right side walls, and a rear wall, and forms a rectangular space with the inside opened downward. The length and height of the white key 41 in the front-rear direction are the same as in the case of the white key 31, but the step for securing the space for the black key 51 provided on the upper wall and the left and right side walls is the case of the white key 31. Is different. Further, at the intermediate position in the front-rear direction on the lower surface of the white key 41, an engagement piece 41a and a pressing portion 41b similar to the engaging piece 31a and the pressing portion 31b of the white key 31 are provided.

  The rear walls of these three white keys 41 are connected to the common attachment portion 43 via the hinge portion 42, respectively. The hinge part 42 and the common attachment part 43 are integrally formed with the white key 41. The hinge part 42 includes a hinge thick part 42a and a pair of hinge thin parts 42b, 42c configured in the same manner as the hinge thick part 32a and the pair of hinge thin parts 32b, 32c of the first key unit 30. Further, a gate corresponding portion 42a1 similar to the gate corresponding portion 32a1 of the first key unit 30 is provided on the upper surface of each hinge thick portion 42a and at a substantially central position in the left-right direction of the white key 41. The common attachment portion 43 is also configured in substantially the same manner as the common attachment portion 33 of the first key unit 30. The concave portion 43a, which is the same as the concave portion 33a, the convex portion 33b, the protrusion 33c, the through hole 33d, and the through hole 33e described above, The protrusion 43b, the protrusion 43c, the through hole 43d, and the through hole 43e are provided.

  However, in the second key unit 40, the front end of the hinge thick part 42a is connected to the lower end of the rear surface of the rear wall of the white key 41, but the front ends of the hinge thin parts 42b and 42c are hinge thick parts. The rear ends of the thin hinge portions 42b and 42c are connected to the lower portion of the front surface of the common attachment portion 43, respectively. When the first and second key units 30 and 40 are assembled to the key frame 10 and the electric circuit board 20, the hinge thick part 42a is at the same height as the hinge thick part 32a of the first key unit 30. The common attachment portion 43 and the thin hinge portions 42b and 42c are located above the common attachment portion 33 and the thin hinge portions 32b and 32c of the first key unit 30. Further, the hinge thick part 42a is slightly spaced in the left-right direction between the hinge thick part 32a of the first key unit 30 (strictly, it is more than the left-right gap between the adjacent white keys 31, 41). It is located with a small gap).

  The width in the front-rear direction of the concave portion 43 a is substantially the same as the width in the front-rear direction of the convex portion 33 b of the first key unit 30, and the common attachment portion 43 of the second key unit 40 is located above the common attachment portion 33 of the first key unit 30. In the assembled state, the convex portion 33b of the first key unit 30 is fitted into the concave portion 43a. The protrusion 43c is provided at a position facing the through hole 33d of the first key unit 30 in the left-right direction, has an outer diameter substantially the same as the inner diameter of the through hole 33d, and the common attachment portion 43 of the second key unit 40 The first key unit 30 is press-fitted into the through-hole 33 d in a state of being assembled on the common attachment portion 33. The through hole 43d is provided at an appropriate position in the left-right direction of the common attachment portion 43 (one place in the left-right direction in the present embodiment). The through-hole 43d is formed in a circular shape, and presses a projection 53c (described later) provided on the third key unit 50 when the third key unit 50 is assembled on the second key unit 40. The through hole 43 e is provided at a position in the left-right direction corresponding to the support portion 12 of the key frame 10 and the through hole 33 e of the first key unit 30 in the common attachment portion 43. The through hole 43e allows a male screw (not shown) to pass through when the first to third key units 30, 40, 50 are assembled to the key frame 10.

  Next, the 3rd key unit 50 is demonstrated using the top view of FIG. 6 (A), and the side view of FIG. 6 (B). The third key unit 50 has five black keys 51 that are not adjacent to each other corresponding to the pitch names C #, D #, F #, G #, and A #. The black key 51 is also composed of an upper wall, a front wall, left and right side walls, and a rear wall, and forms a rectangular space with the inside opened downward. However, the length of the black key 51 in the front-rear direction is shorter than the length of the white keys 31, 41 in the front-rear direction, and the height of the black key 51 is higher than the height of the white keys 31, 41. The upper part of the front wall of the black key 51 is inclined so as to be positioned forward and downward. Engagement pieces 51 a similar to the engagement pieces 31 a and 41 a of the white keys 31 and 41 are provided at the front end position on the lower surface of the black key 51. At an intermediate position on the lower surface of the black key 51, a pressing portion 51b similar to the pressing portions 31b and 41b of the white keys 31 and 41 is provided. Further, a gate corresponding portion 51a1 similar to the gate corresponding portions 32a1 and 42a1 of the first and second key units 30 and 40 is provided in the lower portion (non-external portion) on the front surface of the engagement piece 51a.

  Further, the lower surface of the rear end portion of the black key 51 is formed in a flat plate shape and a rectangular shape, and the length in the left-right direction is substantially the same as the width in the left-right direction of the black key 51. 51c is provided. When the first to third key units 30, 40, 50 are assembled to the key frame 10 and the electric circuit board 20, the protruding piece 51 c excludes between the white keys 31, 41 corresponding to the E sound and the F sound. Between the other adjacent white keys 31 and 41, the hinges 32a and 42a of the first and second key units 30 and 40 enter from the upper side in front.

  The rear walls of these five black keys 51 are connected to a common attachment portion 53 via hinge portions 52, respectively. The hinge part 52 and the common attachment part 53 are integrally formed with the black key 51. The hinge portion 52 includes a hinge thick portion 52a and a pair of hinges configured similarly to the hinge thick portions 32a, 42a and the pair of hinge thin portions 32b, 32c, 42b, 42c of the first and second key units 30, 40. It consists of thin portions 52b and 52c. The common mounting portion 53 is also configured in substantially the same manner as the common mounting portions 33 and 43 of the first and second key units 30 and 40, and the above-described concave portions 33a and 43a, convex portions 33b and 43b, projections 33c and 43c, and Similar to the through holes 33e and 43e, there are a concave portion 53a, a convex portion 53b, a projection 53c, and a through hole 53e.

  However, in the third key unit 50, the front end of the hinge thick part 52a is connected to the lower end of the rear surface of the rear wall of the black key 51, but the front ends of the hinge thin parts 52b and 52c are hinge thick parts. 52a is connected to the lower end portion of the rear surface, and the rear ends of the hinge thin portions 52b and 52c are connected to the lower portion of the front surface of the common attachment portion 53. In the state where the first to third key units 30, 40, 50 are assembled to the key frame 10 and the electric circuit board 20, the common attachment portion 53, the hinge thick portion 52a, and the hinge thin portion of the third key unit 50 are provided. 52b and 52c are located above the common attachment portion 43, the hinge thick portion 42a, and the hinge thin portions 42b and 42c of the second key unit 40, respectively.

  The shape and the vertical thickness of the hinge thick part 52a are substantially the same as the shape and the vertical thickness of the hinge thick parts 32a and 42a of the first and second key units 30 and 40. However, the length in the front-rear direction of the hinge thick portion 52a is slightly shorter than the length in the front-rear direction of the hinge thick portions 32a, 42a, and the length in the left-right direction of the hinge thick portion 52a is the hinge thick portion. It is slightly longer than the length in the left-right direction of 32a, 42a. The center position of the hinge thick part 52a in the left-right direction is the same as the center position of the black key 51 in the left-right direction. The shape of the hinge thin portions 52b, 52c, the thickness in the vertical direction, and the length in the front / rear direction are the shapes of the hinge thin portions 32b, 32c, 42b, 42c of the first and second key units 30, 40, and the thickness in the vertical direction. And the length in the front-rear direction. However, the left and right lengths of the hinge thin portions 52b and 52c are slightly shorter than the left and right lengths of the hinge thin portions 32b, 32c, 42b and 42c. The hinge thin portions 52b and 52c are also arranged symmetrically with respect to the center in the left-right direction of the black key 51, but the gap between the hinge thin portions 52b and 52c is between the hinge thin portions 32b and 32c. It is larger than the gap and the gap between the hinge thin portions 42b and 42c.

  In addition, projecting portions (tabs) 52d and 52e projecting in the left-right direction are provided at the left and right ends of the hinge thick portion 52a. The protrusions 52d and 52e have the same vertical thickness as the vertical thickness of the hinge thick portion 52a, and the length in the front / rear direction is made shorter than the length of the hinge thick portion 52a in the front / rear direction. The outer end is formed into a square shape with chamfers. These protrusions 52d and 52e are provided in front of the hinge thick part 52a, with the front surface being the same as the front surface of the hinge thick part 52a. Thereby, the rear surface of the protrusions 52d and 52e is located in front of the rear surface of the hinge thick portion 52a. The protrusions 52d and 52e corresponding to the plurality of black keys 51 have different lengths in the left-right direction, and a slight gap is provided between the protrusions 52d and 52e corresponding to the two adjacent black keys 51. ing. Specifically, regarding the black key 51 of the C # sound and the F # sound, the protruding amount of the protruding portion 52d in the left direction is large, and the protruding amount of the protruding portion 52e in the right direction is small. Regarding the black key 51 for the D # sound and A # sound, the protruding amount of the protruding portion 52d in the left direction is small, and the protruding amount of the protruding portion 52e in the right direction is large. Regarding the black key 51 of G # sound, the protruding amounts of the protruding portions 52d and 52e in the left-right direction are both small.

  The protrusions 52d and 52e will be further described with reference to FIG. 7A is an enlarged plan view of a portion X indicated by a broken line in FIG. 3, and FIG. 7B is an enlarged cross-sectional view taken along line bb in FIG. 7A. FIG. 7B shows a state in which a large gate mark remains in the gate corresponding portion 31a1. The rear surfaces 52d1 and 52e1 of the protrusions 52d and 52e are inclined surfaces that are inclined to the front side from the upper end toward the lower end. That is, the lower ends of the rear surfaces 52d1 and 52e1 are positioned in front of the upper ends of the rear surfaces 52d1 and 52e1. The rear surface 52d1 is not shown. This increases the area of the upper surface of the protrusions 52d and 62d so that the hinge thick parts 32a and 42a of the first and second key units 30 and 40 are as difficult to see as possible from above, and at the same time, the protrusions 52d and 52e This is to increase the area of the rear upper surface of the hinge thick portions 32a and 42a that do not face the lower surface.

  By configuring the protrusions 52d and 52e in this way, the first and second key units 30 can be obtained when the first to third key units 30, 40, and 50 are assembled to the key frame 10 and the electric circuit board 20. 40, a space is formed between a pair of adjacent hinge thick portions 52a and 52a of the black key 51 in a part of the upper surface of the rear portion of the hinge thick portions 32a and 42a. The gate corresponding portions 32a1 and 42a1 described above are provided on the upper surfaces of the hinge thick portions 32a and 42a corresponding to this space. This is because when the resin is injected into the gate corresponding portions 32a1 and 42a1 and the first and second key units 30 and 40 are integrally molded, the gate marks (protrusions) remaining on the gate corresponding portions 32a1 and 42a1 are projected into the protruding portions 52d. , 52e so as not to contact the lower surface. In particular, when the black key 51 is depressed, the hinge thick part 52a corresponding to each black key 51 swings as shown by the broken line arrow in FIG. 7B. There is a possibility that the rear end of the lower surface of 52e may contact the gate mark. However, as described above, the rear surfaces 52d1 and 52e1 of the projecting portions 52d and 52e are inclined so that the rear surfaces 52d1 and 52e1 are positioned on the front side as they go downward, so that the lower surfaces of the projecting portions 52d and 52e The rear end can be prevented from contacting the gate mark.

  The width in the front-rear direction of the concave portion 53 a is substantially the same as the width in the front-rear direction of the convex portion 43 b of the second key unit 40, and the common attachment portion 53 of the third key unit 50 is placed on the common attachment portion 43 of the second key unit 40. In the assembled state, the convex portion 43b of the second key unit 40 is fitted into the concave portion 53a. The protrusion 53c is provided at a position facing the through hole 43d of the second key unit 40 in the left-right direction, has an outer diameter substantially the same as the inner diameter of the through hole 43d, and the common attachment portion 53 of the third key unit 50 The two-key unit 40 is press-fitted into the through-hole 43d in a state of being assembled on the common attachment portion 43. The through hole 53 e is provided at a position in the left-right direction corresponding to the support portion 12 of the key frame 10 and the through holes 33 e and 43 e of the first and second key units 30 and 40 in the common attachment portion 53. The through hole 53e allows a male screw (not shown) to pass through when the first to third key units 30, 40, 50 are assembled to the key frame 10.

  At appropriate positions in the left and right direction on the rear end face of the common mounting portion 53 (in this embodiment, two positions in the middle in the left and right direction), hook portions 53f are extended downward. The lower end portion of the hook portion 53f is provided with a locking claw that protrudes forward and has a flat top surface and a triangular cross section. When the first to third key units 30, 40, 50 are assembled to the electric circuit board 20, the locking claws of the hook portion 53 f are engaged with the rear end of the lower surface of the electric circuit board 20. However, when the first to third key units 30, 40, 50 and the electric circuit board 20 are fixed to the key frame 10 with screws (not shown), the locking claw of the hook portion 53 f is the rear lower end of the electric circuit board 20. Is not engaged (ie, contacted). The common attachment portion 53 is formed with a rectangular through hole 53g that faces the upper surface of the locking claw and penetrates the common attachment portion 53 in the vertical direction at a position corresponding to the hook portion 53f. . This is because when the third key unit 50 is integrally molded with resin, the hooking claw for the hook portion 53f is easily molded using the upper and lower molds.

  Next, the assembly of the electric circuit board 20 and the first to third key units 30, 40, 50 configured as described above to the key frame 10 will be described. The common attachment portion 43 of the second key unit 40 is placed on the common attachment portion 33 of the first key unit 30, and the second key unit 40 is assembled on the first key unit 30. In this case, the convex portion 33 b of the common mounting portion 33 is fitted into the concave portion 43 a of the common mounting portion 43, and the protrusion 43 c of the common mounting portion 43 is press-fitted into the through hole 33 d of the common mounting portion 33. Next, the common attachment portion 53 of the third key unit 50 is placed on the common attachment portion 43 of the second key unit 40 assembled on the first key unit 30, and the third key unit 50 is moved to the second key unit 30. It is assembled on the key unit 40. In this case, the convex portion 43 b of the common mounting portion 43 is fitted into the concave portion 53 a of the common mounting portion 53, and the protrusion 53 c of the common mounting portion 53 is press-fitted into the through hole 43 d of the common mounting portion 43. As a result, a keyboard unit including the first to third key units 30, 40, 50 is completed.

  Next, the electric circuit board 20 is placed on the support parts 11 and 12 by aligning the through hole provided in the front part of the electric circuit board 20 with the support part 11 of the key frame 10. Then, a male screw (not shown) is inserted into the screw hole provided in the support portion 11 from the upper surface of the electric circuit board 20 and is screwed together, and the electric circuit board 20 is assembled to the key frame 10. The buffer members 14 and 21 are fixed to the lower limit stopper portion 13 of the key frame 10 and the lower surface of the front end portion of the electric circuit board 20 in advance.

  Next, a keyboard unit including the first to third key units 30, 40, 50 is assembled to the electric circuit board 20. In this case, while the engaging pieces 31a, 41a, 51a of the white keys 31, 41 and the black key 51 are engaged with the lower surface of the front end portion of the electric circuit board 20, the protruding piece 33f of the first key unit 30 is connected to the electric circuit board. 20, the common attachment portion 33 of the first key unit 30 is placed on the rear end portion of the electric circuit board 20, and the hook portion 53 f of the third key unit 50 is locked. The claw is engaged with the lower surface of the rear end portion of the electric circuit board 20. In this state, the through holes 33e, 43e, 53e provided in the common mounting portions 33, 43, 53 of the first to third key units 30, 40, 50 and the through holes (not shown) provided in the electric circuit board 20 are It almost opposes the screw hole provided in the support portion 12 of the frame 10. Then, male screws (not shown) are passed through the through holes 33e, 43e, 53e and the through holes of the electric circuit board 20 from above to enter and screw into the screw holes provided in the support portion 12.

  Next, the upper cover 15 is connected to a joint portion (not shown) of the key frame 10 to cover the rear portion of the third key unit 50. Thereby, the keyboard unit composed of the first to third key units 30, 40, 50 is assembled on the key frame 10 and the electric circuit board 20, and the keyboard device is completed. In this state, the front surface of the upper cover 15 is located above the front portion of the hinge thick portion 52a of the third key unit 50 and the protruding portions 52d and 52e, and the front surface of the upper cover 15, the white keys 31 and 41, and the black key. A slight gap is provided between the rear end surface of the key 51.

  In the keyboard device thus completed, when the performer presses the white keys 31, 41 and the black key 51, the white keys 31, 41 and the black key 51 are hinged thin portions 32b, 32c, 42b and 42c. , 52b, and 52c are caused to swing around the common mounting portions 33, 43, and 53, and their front end portions are displaced downward. Then, when the lower surfaces of the engagement pieces 31a, 41a, 51a of the white keys 31, 41 and the black key 51 come into contact with the upper surface of the cushioning material 14, the swinging of the white keys 31, 41 and the black key 51 is stopped. On the other hand, when the pressed white keys 31 and 41 and the black key 51 are released, the white keys 31 and 41 and the black key 51 are hinged thin portions 32b, 32c, 42b, 42c, 52b, and 52c and illustrated. Due to the restoring force of the omitted key switches (rubber dome switches), their front end portions are displaced upward. When the upper surfaces of the protruding portions of the engagement pieces 31a, 41a, 51a of the white keys 31, 41 and the black key 51 come into contact with the lower surface of the cushioning material 21, the white keys 31, 41 and the black key 51 are returned to their original positions ( The key is released.

  By pressing and releasing the white keys 31 and 41 and the black key 51, the pressing portions 31b, 41b and 51b turn on and off a key switch (not shown) provided on the electric circuit board 20. The generation of musical tone signals corresponding to the white keys 31 and 41 and the black key 51 that have been pressed / released is controlled by turning on / off the key switch.

  In the keyboard device configured and operated as described above, the protruding portions 52d that protrude outward at both outer ends in the left-right direction of the hinge thick portion 52a of the third key unit 50 having the uppermost common mounting portion 53. , 52e are provided so that the gap in the left-right direction between the adjacent protrusions 52d, 52e is reduced. As a result, even if the distances between the plurality of black keys 51 are different, the gap between the adjacent black keys 51 in the vicinity of the rear of the plurality of black keys 51 is extremely small regardless of the hinge thick portion 52a. Can be. As a result, the hinge portions 32 and 42 of the first and second key units 30 and 40 having the common attachment portions 33 and 43 positioned below the uppermost stage can be made inconspicuous from above, and the white key In the state where the rear cover 31 and 41 and the black key 51 are covered with the upper cover 15 slightly behind the rear position, the appearance is good.

  Further, in the plurality of hinge portions 32, 42 in the first and second key units 30, 40, the hinge thickness portions 32a, 42a have the same vertical thickness, longitudinal length, and horizontal width. In addition, the thickness in the vertical direction, the length in the front-rear direction, and the width in the left-right direction of the pair of thin hinge portions 32b, 32c, 42b, 42c are the same. In the plurality of hinge portions 32, 42, the center position in the left-right direction of the hinge thick portions 32a, 42a is made to coincide with the center position in the left-right direction of the front portion of the white keys 31, 41, and a pair of hinge thin portions 32b , 32c, 42b, 42c are arranged symmetrically with respect to the center position in the left-right direction of the front part of the white keys 31, 41, respectively. Thereby, there is a difference between the plurality of white keys 31 and 41 in the rigidity (elasticity) of the hinge thin portions 32b, 32c, 42b and 42c and the hinge thick portions 32a and 42a in the left and right direction of the white keys 31 and 41. It is possible to eliminate the occurrence of a difference in the left and right direction in one white key 31, 41. As a result, the touch feeling when the white keys 31 and 41 are pressed / released can be made the same for the plurality of white keys 31 and 41, and the deviation of the balance in the left and right direction of one white key 31 and 41 can be eliminated. And the touch feeling can be improved. Further, by eliminating the balance deviation in the left-right direction, the hinge thin portions 32b, 32c, 42b, 42c and the hinge thick portions 32a, 42a are not twisted, and the durability is improved.

  Also, in the plurality of hinge portions 52 in the third key unit 50, the thickness, the length in the front-rear direction, and the width in the left-right direction of the hinge thick portion 52a are the same, and a pair of hinge thin portions 52b. , 52c have the same vertical thickness, longitudinal length, and lateral width. Also, in the plurality of hinge parts 52, the center position in the left-right direction of the hinge thick part 52a is made to coincide with the center position in the left-right direction of the black key 51, and the pair of hinge thin parts 52b, 52c are left and right of the black key 51. They were arranged symmetrically with respect to the center position in the direction. As a result, differences in the rigidity (elasticity) of the hinge thin portions 52b and 52c and the hinge thick portion 52a in the left-right direction of the black key 51 occur between the plurality of black keys 51, and the right and left of one black key 51 It is possible to eliminate a difference in direction. As a result, the key touch feeling when the black key 51 is pressed / released can be made the same for a plurality of black keys 51, and the deviation of the balance in the left-right direction in one black key 51 can be eliminated. A feeling can be made favorable. Further, by eliminating the balance deviation in the left-right direction, the hinge thin portions 52b and 52c and the hinge thick portion 52a are not twisted, and the durability is improved.

  Moreover, in the said embodiment, the common attachment part 53 of the 3rd key unit 50 which has the black key 51 is made into the uppermost stage, and the protrusion parts 52d and 52e are provided in the both right and left sides of the hinge thick part 52a, and the white key 31 is provided. , 41 so that the thick hinge portions 32a, 42a of the first and second key units 30, 40 are difficult to see from above. In this case, the hinge thick portions 32 a and 42 a are the same white color as the white keys 31 and 41, whereas the hinge thick portion 52 a and the protruding portions 52 d and 52 e are the same black as the black key 51. By hiding the lower member in black as described above, the hinge thick portions 32a and 42a which are the lower members are difficult to see, and the common attachment portion 33 (or the common attachment portion) of the first key unit 30 (or the second key unit 40). 43), the lower member is blinded compared to the case where white protrusions having the same shape as the protrusions 52d and 52e are provided on the left and right sides of the hinge thick part 32a (or the hinge thick part 42a). Becomes better.

  Furthermore, in the above embodiment, the length in the front-rear direction of the protrusions 52d, 52e provided on the third key unit 50 located at the uppermost stage is made shorter than the length in the front-rear direction of the hinge thick part 52a, The rear surfaces of the protrusions 52d and 52e are positioned in front of the rear surface of the hinge thick portion 52a. Then, a space is formed between a pair of hinge thick portions 52a and 52a of the adjacent black key 51 in a part on the upper surface of the rear portion of the hinge thick portions 32a and 42a of the first and second key units 30 and 40. In addition, gate corresponding portions 32a1 and 42a1 for molding the first and second key units 30 and 40 are provided on a part of the upper surface of the rear portion of the hinge thick portions 32a and 42a. Thus, when the resin is injected into the gate corresponding portions 32a1 and 42a1 and the first and second key units 30 and 40 are integrally molded, the protruding portions are formed on the gate marks (projections) remaining on the gate corresponding portions 32a1 and 42a1. The lower surfaces of 52d and 52e are not in contact with each other. Further, when the first and second key units 30 and 40 are molded, the resin can be poured uniformly and smoothly into the white keys 31 and 41 and the common mounting portions 33 and 43, and there is no occurrence of a weld line or the like. The first and second key units 30 and 40 can be integrally molded well.

  In particular, the rear surfaces 52d1 and 52e1 of the protrusions 52d and 52e are inclined so that the rear surfaces 52d1 and 52e1 are positioned on the front side toward the lower side, so that the rear ends of the upper surfaces of the protrusions 52d and 52e are somewhat rearward. However, the rear ends of the lower surfaces of the protrusions 52d and 52e do not come into contact with the gate marks when the black key 51 is pressed. Thereby, the front-back direction width | variety of the upper surface of protrusion part 52d, 52e can be enlarged, and the blinding effect of the lower member by protrusion part 52d, 52e can be made favorable.

  The keyboard device according to the present invention is not limited to the above embodiment, and can be implemented with appropriate modifications.

  In the above-described embodiment, the pair of hinge thin portions 32b, 32c, 42b, 42c, 52b, 52c are connected to the rear surfaces at both outer ends in the left-right direction of the hinge thick portions 32a, 42a, 52a. However, instead of the pair of thin hinge portions 32b, 32c, 42b, 42c, 52b, 52c, one hinge thin portion is provided for each key 31, 41, 51, and each hinge thin portion is hinged. You may make it connect to the rear surface of the meat | flesh part 32a, 42a, 52a, respectively.

  In the above embodiment, the protrusions 52d and 52e are provided on both the left and right sides of the hinge thick part 52a for all the black keys 51. However, instead of this, the protrusions 52d (or protrusions 52e) are provided only on one of the left and right sides of each black key 51, and between the adjacent black keys 51, the hinge thick part 52a and the protrusion 52d (or The gap in the left-right direction with respect to the protruding portion 52e) may be reduced so that the lower hinge thick portions 32a and 42a are not conspicuous from above.

  Also, between the hinge thick portions 52a, 52a of the black keys 51, 51 corresponding to the C #, D # sound, between the hinge thick portions 52a, 52a of the black keys 51, 51 corresponding to the F #, G # sound, Since the gap between the thick hinge portions 52a and 52a of the black keys 51 and 51 corresponding to the G # and A # sounds is not so large, the right-side protruding portion 52e and D # of the black key 51 corresponding to the C # sound. The left protrusion 52d of the black key 51 corresponding to the sound, the right protrusion 52e of the black key 51 corresponding to the F # sound, the left protrusion 52d of the black key 51 corresponding to the G # sound, and the G # sound The protrusion 52e on the right side of the corresponding black key 51 and the protrusion 52d on the left side of the black key 51 corresponding to the A # sound are not a big problem even if omitted. In this case, the length in the left-right direction of the hinge thick part 52a may be slightly increased, and the left-right gap between the hinge thick parts 52a, 52a may be as small as possible.

  Moreover, in the said embodiment, the thickness of the up-down direction of protrusion part 52d, 52e was made the same with the thickness of the upper direction of the hinge thick part 52a. However, instead of this, the thickness in the vertical direction of the protrusions 52d and 52e is smaller than the thickness in the upward direction of the hinge thick part 52a, for example, approximately the same as the thickness in the vertical direction of the hinge thin parts 52b and 52c. May be.

  Moreover, in the said embodiment, the width | variety of the front-back direction of protrusion part 52d, 52e is made narrower than the width | variety of the front-back direction of hinge thick part 52a, and protrusion part 52d, 52e is the 1st and 2nd key unit 30, The gate thick portions 32a and 42a are not overlapped with a portion of the upper surface of the 40 hinge thick portions 32a and 42a, and the gate corresponding portions 32a1 and 42a1 are provided on a portion of the upper surface. However, the problem of contact between the gate marks (protrusions) remaining when the first and second key units 30 and 40 are molded from resin and the lower surfaces of the protrusions 52d and 52e is another method (for example, another inconspicuous in appearance). If the first and second key units 30 and 40 are molded by providing a gate-corresponding portion in this portion, the protruding portion provided in the third key unit 50 having the uppermost common mounting portion 53 can be solved. The width in the front-rear direction of 52d and 52e may be the same as the width in the front-rear direction of the hinge thick portion 52a.

  Moreover, in the said embodiment, about the shape and dimensional relationship of the hinge thick part 32a, 42a, 52a and the hinge thin part 32b, 32c, 42b, 42c, 52b, 52c of the 1st thru | or 3rd key units 30,40,50. It was defined in detail. For example, the length in the front-rear direction of the hinge thick portion 52a of the third key unit 50 is made slightly shorter than the length in the front-rear direction of the hinge thick portions 32a, 42a of the first and second key units 30, 40. At the same time, the length of the hinge thick portion 52a in the left-right direction is slightly longer than the length of the hinge thick portions 32a, 42a in the left-right direction. Further, the length in the front-rear direction of the hinge thin portions 52b, 52c of the third key unit 50 is substantially the same as the length in the front-rear direction of the hinge thin portions 32b, 32c, 42b, 42c of the first and second key units 30, 40. In addition, the left and right lengths of the hinge thin portions 52b and 52c are slightly shorter than the left and right lengths of the hinge thin portions 32b, 32c, 42b and 42c. However, the shape and dimensional relationship can be changed little by little as appropriate.

  Further, in the above embodiment, the common attachment portion 53 of the third key unit 50 having the black key 51 is placed on the common attachment portions 33 and 43 of the first and second key units 30 and 40 having the white keys 31 and 41. The common mounting portion 53 was placed on the top so that it was placed. However, the common attachment portion 33 (or the common attachment portion 43) of the first key unit 30 (or the second key unit 40) related to the white key 31 (or the white key 41) may be placed on the uppermost stage. . In this case, a protrusion similar to the protrusions 52d and 52e described above is provided on the outer end in the left-right direction of the hinge thick part 32a (or the hinge thick part 42a) of the first key unit 30 (or the second key unit 40). Try to provide it. Also by this, while maintaining a good appearance to some extent, the presence of the protrusions causes the hinge thin portions 32b and 32c (or the hinge thin portions 42b and 42c) and the hinge thick portion 32a (or the hinge thick portion 42a). Can be arranged at an arbitrary position in the left-right direction with respect to the white key 31 (or the white key 41).

DESCRIPTION OF SYMBOLS 10 ... Key frame, 11, 12 ... Support part, 15 ... Upper cover, 20 ... Electric circuit board, 30, 40, 50 ... 1st thru | or 3rd key unit, 31, 41 ... White key, 51 ... Black key, 32 , 42, 52 ... Hinge part, 32a, 42a, 52a ... Hinge thick part, 32a1, 42a1, 51a1 ... Gate corresponding part, 32b, 32c, 42b, 42c, 52b, 52c ... Hinge thin part, 52d, 52e ... Projection Part, 33, 43, 53 ... Common attachment part (rail part)

Claims (3)

A plurality of keys extending in the front-rear direction and arranged in parallel in the left-right direction;
A long common mounting portion extending in the left-right direction;
A plurality of tabular hinge portions each provided between a rear end of the plurality of keys and the common mounting portion and having a horizontal plate surface, each including a plurality of key units integrally formed;
In the keyboard device in which the common mounting portions of the plurality of key units are respectively placed and fixed on the key frame,
Multiple hinges in each key unit
A thick hinge part that is thick in the vertical direction and is formed in a substantially rectangular and flat shape that is long in the left and right direction, and is connected to the rear surface of one key at the front end. A hinge thick part matched with the center position in the left-right direction of the one key;
A thin hinge portion formed thin in the vertical direction and connected to the rear surface of the thick hinge portion, and connected to the front surface of the common attachment portion, with respect to the lateral center position of the one key. Are configured with hinge thin-walled parts arranged symmetrically ,
For each key unit, in the plurality of hinge portions, the thickness of the hinge thick portion in the vertical direction, the length in the front-rear direction, and the width in the left-right direction are the same, and the thickness in the vertical direction of the thin hinge portion The length in the front-rear direction and the width in the left-right direction are the same ,
Among the plurality of key units, in the key unit in which the common mounting portion is located at the uppermost stage,
It provided a protruding portion that protrudes outward in at least one of the two outer ends of the left and right direction of the hinge thick portion, to reduce the lateral direction of the gap between the protrusions or the hinge thick portion adjacent, and
The width in the front-rear direction of the protrusion is smaller than the width in the front-rear direction of the hinge thick part, and the rear end of the protrusion is positioned in front of the rear end of the hinge thick part,
A part of the upper surface of the hinge thick part of the key unit having a common mounting portion located below the uppermost common mounting portion, and a pair of adjacent hinges of the key unit having the common mounting portion positioned at the uppermost stage A keyboard device, wherein the keyboard device is located behind the protruding portion between the thick portions .   The keyboard apparatus according to claim 1, wherein the hinge thin portion includes a pair of hinge thin portions respectively connected to rear surfaces of both outer end portions in the left-right direction of the hinge thick portion. The keyboard device according to claim 1, wherein the plurality of keys included in each key unit is only a white key or only a black key .

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