JP4380335B2 - Key operation detection device - Google Patents

Description

  The present invention relates to a key operation detection device that is provided in a keyboard device of an electronic musical instrument and detects a key operation according to a key pressing force in order to reflect the key operation in musical tone control.

Conventionally, as a keyboard device using such a key operation detection device, for example, there is one disclosed in Japanese Patent Application Laid-Open No. 2003-29756. In this conventional keyboard device, when the key (30) is further pressed down after the key pressing stroke of the key (30), the downward force is transmitted to the plate-like member (50) via the lower limit stopper holder (51). The plate member (50) is bent downward, and the displacement amount of the lower limit stopper holder (51) is detected by the sensor (55). The detection signal from the sensor (55) is reflected in, for example, timbre, volume, pitch, reverb, pan, vibrato, etc. to control the musical sound.
JP 2003-29756 A

  Here, there is a case where the key is pressed with a strong key operation force as if, for example, the entire keyboard is pressed after a key pressing stroke, and the plate-like member (elastic member) requires a considerable elastic strength. For this reason, the displacement amount of the plate-like member (displacement amount of the lower limit stopper holder) due to the key operation force as described above, that is, the displacement amount applied to the sensor is only a small amount, and the sensor detection signal cannot be sufficiently resolved. There is a problem.

  Further, the displacement of the plate-like member increases as it approaches the player-side tip of the plate-like member. However, it is difficult to provide a sensor near the tip of the plate-like member. It is necessary to provide it inside. However, if the sensor is provided closer to the base end portion (fixed portion side end portion) of the plate-like member, the amount of displacement given to the sensor is further reduced. For this reason, there is a problem that the mounting position of the sensor is limited and the degree of freedom in design is low.

  Here, in order to compare the present invention, which will be described later, with the conventional technique described above, the relationship between the conventional structure and each of the displacement amounts is illustrated in principle as shown in FIG. In FIG. 5, the elastic member A (plate-like member) has an end fixed to a fixing portion B (for example, a key frame), and the sensor C is in contact with an action point D that is a predetermined position of the elastic member A. The end of the elastic member A on the fixed part side is a base end E, and the end of the elastic member A opposite to the base end E is a load point F that receives an operation force [W] from the key after a key pressing stroke. It has become. Also, the distance from the base end E to the load point F is [L1], and the distance from the base end E to the action point D is [L2].

  In this configuration, when the downward displacement of the load point F due to the action of the operating force [W] is [V1] and the downward displacement of the action point D is [V2], as known in material mechanics, The displacement [V2] can be expressed as the following equation (1).

  Therefore, if L2 = (1/2) × L1, then V2 = (5/16) × V1 = 0.3125 × V1, and the displacement [V2] applied to the sensor C is the displacement [V1] of the load point F. ] Of 1/3 or less.

  The present invention provides a key operation detection device that detects a key operation force and reflects it in a musical tone so as to increase the displacement given to the sensor as described above, thereby improving the detection resolution of the sensor, It is an object to be able to freely set the mounting position of and increase the degree of design freedom.

The operation of the key operation detection device according to claim 1 will be described with reference to FIG. In FIG. 1, the end of the first elastic member A that is displaced by the key operation force [W] is fixed to the fixed portion B, and the end of the second elastic member AA to be detected is fixed to the support member BB. The base end portion EE of the second elastic member AA to be detected is provided farther from the base end portion E of the first elastic member A with reference to the load point F that is a position for receiving the key operating force [W] of the first elastic member A. It has been. Further, the second elastic member AA to be detected is a position (load point F) where the load point FF, which is a position that receives the key operation force [W], is displaced by receiving the key operation force [W] of the first elastic member A. In the vicinity, the second elastic member AA to be detected and the first elastic member A are interlocked with each other at the displaced positions (load points F and FF).

  The sensor C is in contact with the action point DD of the second elastic member AA to be detected. The distance from the base end E of the first elastic member A to the load point F is [L1], the distance from the base end E to the action point DD is [L2], and the base end of the second elastic member AA to be detected. If the distance from the EE to the load point FF is [L3], the distance from the base end EE of the second elastic member AA to be detected to the action point DD is (L3 -L1 + L2).

  In this configuration, when the downward displacement of the load points F and FF due to the action of the operating force [W] is [V1] and the downward displacement of the action point DD is [V3], [ Since the same relationship as V1, V2, L1, L2] can be applied to the above [V1, V3, L3, (L3−L1 + L2)] shown in FIG. 1, the displacement [V3] is expressed by the following equation (2). It can be expressed as

  Therefore, in order to make the same conditions as in FIG. 5, if L2 = (1/2) × L1, and if L3 = 2 × L1, then V3 = (81/124) × V1 = 0.65 × V1 Become. That is, compared with FIG. 5, the displacement detected by the sensor C is 0.65 without changing the position of the sensor C with respect to the load point F and the displacement of the load point F (or the spring constant of the first elastic member A). /0.3125=2.08 times. This action is such that L3> L1, that is, the base end EE of the second elastic member AA to be detected is provided farther from the base end E of the first elastic member A with respect to the load point F. by.

The operation of the key operation detection device according to claim 2 will be described with reference to FIG. In FIG. 2, the elastic member A that is displaced by the key operation force [W] has an end fixed to the fixed portion B, and the detected member G is supported by the fulcrum H. A fulcrum portion H that is a base end portion of the member G to be detected is provided farther from a base end portion E of the elastic member A with reference to a load point F that is a position that receives the key operation force [W] of the elastic member A. . The detected member G is in the vicinity of a position (load point F) where the load point FF that receives the key operation force [W] is displaced by receiving the key operation force [W] of the elastic member A, The detected member G is interlocked with each other at the displaced position (load points F, FF), and the detected member G rotates about the fulcrum portion H.

  The sensor C is in contact with the action point DD of the detected member G. The distance from the base end E of the elastic member A to the load point F [L1], the distance from the base end E to the action point DD [L2], from the fulcrum H of the detected member G to the load point FF Is the distance [L4].

  In this configuration, when the downward displacement of the load points F and FF due to the operation of the operating force [W] is [V1] and the downward displacement of the action point DD is [V4], the displacement [V4] is proportionally related. Can be expressed as the following equation (3).

  Therefore, in order to make the same conditions as in FIG. 5, if L2 = (1/2) × L1, and if L4 = 2 × L1, then V4 = (3/4) × V1 = 0.75 × V1 Become. That is, compared with FIG. 5, the displacement detected by the sensor C is 0.65 without changing the position of the sensor C with respect to the load point F and the displacement of the load point F (or the spring constant of the first elastic member A). /0.3125=2.4 times. This action is due to L4> L1, that is, the fulcrum part H of the member G to be detected is provided farther from the base end E of the elastic member A with the load point F as a reference.

  As described above, the amount of displacement detected by the sensor can be increased by bringing L2 closer to L1, but the invention of claims 1 and 2 is effective when it is difficult to move the mounting position of the sensor due to mounting restrictions or the like. . The amount of displacement detected by the sensor can be increased by lowering (ie, softening) the spring constant of the first elastic body, but it is difficult to change the spring constant due to performance limitations such as a decrease in response speed. However, the inventions of claims 1 and 2 are effective.

  In the configuration of FIG. 1, the load point FF of the second elastic member AA to be detected coincides with the position (load point F) that is displaced by receiving the key operation force [W] of the first elastic member A. Further, in the configuration of FIG. 2, it is preferable that the load point FF of the member G to be detected coincides with a position (load point F) that is displaced by receiving the key operation force [W] of the elastic member A. . However, these positions may be slightly shifted from each other. That is, the term “neighboring” in claim 1 and claim 2 also includes a point that matches.

  According to the key operation detection device of claim 1 or 2, in the key operation detection device that detects the key operation force and reflects it in the musical sound, the displacement given to the sensor is increased, and the detection resolution of the sensor is improved. In addition, the mounting position of the sensor can be freely set, and the degree of freedom in design can be increased.

  Hereinafter, an embodiment of the present invention will be described. In this specification, when referring to “up / down / left / right” of a keyboard device (electronic musical instrument), it means “up / down / left / right” in an upright state as viewed from the player side (keyboard side) at the time of performance. Also, when referring to the “front-rear direction (or front and back)”, the performer side is “front, front” and the back side is “back, back”.

  3 is a cross-sectional view of a keyboard device of an electronic musical instrument to which the key operation detection device of the embodiment of the present invention is applied, FIG. 4 is a partial perspective view seen from the back side of the keyboard device, and FIG. It is -A arrow sectional drawing. This keyboard device is a keyboard device for an electronic organ. The key operation detecting device 10 according to the embodiment detects a key pressing force in the key pressing / releasing direction (vertical direction), and a sensor (not shown) presses the keys in the key arranging direction. The key force is detected so that tone control of tone color, volume, pitch, reverb, pan, vibrato, etc. can be performed. The key operation detection device 10 shown in FIGS. 3 and 4 is shown as being configured on the right side of the keyboard, but is also configured on the left side of the keyboard in the same manner (symmetrical). The detection accuracy of the key pressing operation in the direction of pressing and releasing keys by the sensor is improved.

  The key frame 1 includes a fixed frame 11 for fixing the keyboard device to the instrument body, a movable frame 12, and a hinge portion 13 that connects the fixed frame 11 and the movable frame 12. The movable frame 12 and the hinge portion 13 are integrally formed of a hard synthetic resin by a mold. The hinge portion 13 is formed in a rib shape having a small thickness in the key arrangement direction, and a plurality of the ribs are provided in the key arrangement direction. Due to the elasticity of the hinge portion 13, the movable frame 12 is locked to the fixed frame 11. Slightly swingable in the direction of alignment. Note that the fixed frame 11 and the movable frame 12 have a lightweight and robust structure with a large number of ribs and the like that form a vertical surface in the same manner as the hinge portion 13.

  The key (white key and black key) 2 is attached to the key support portion 11a at the top of the fixed frame 11 so as to be rotatable at the base end portion 2a on the back side. In FIG. 3, the cross-section of the white key appears and the black key is hidden behind the white key. Therefore, the white key will be mainly described below, but the black key has the same configuration as the white key. A return spring 21 is mounted between the spring engaging portion 11 b of the fixed frame 11 and the spring receiving portion 2 b of the key 2. The return spring 21 biases the key 2 upward, and when the key is released after the key is pressed, the key 2 is returned to the non-key-pressed position.

  Two stopper abutting pieces 2c extend downward from the front of the key 2 (in the vicinity of the tip in the case of a black key). A key guide support portion 12a is formed integrally with the movable frame 12 at the tip of the movable frame 12, and a key guide 121 is fitted to the key guide support portion 12a. The contact piece 2c is slidable in the vertical direction with the key guide 121 interposed therebetween. Thereby, the swing of the keys 2 in the key arrangement direction is suppressed by the key guide 121. More precisely, when the key 2 is swung in the key arrangement direction, the force is transmitted to the movable frame 12 via the key guide 121, and the movable frame 12 is swung in the key arrangement direction with respect to the fixed frame 11. On the movable frame 12, a circuit board 4 to which a key switch 41 or the like is attached is disposed, and the key switch 41 detects key-on, key-off, and the like corresponding to the key 2 being pressed or released.

  The key operation detection device 10 of the embodiment is disposed on a movable frame 12, and this key operation detection device 10 detects a key pressing operation independently of the swinging of the movable frame 12 in the key arrangement direction. Boss 12c, 12c extending on the back surface is formed integrally with the movable frame 12 on the movable frame 12, and a first elastic member (plate spring) 5 and an extension washer 6 are provided at the lower end of the boss 12c, 12c. Is fixed with screws N1 and N1. In addition, as shown in FIG. 4, the 1st elastic members 5 and 5 are provided in the left-right pair about the said one key operation detection apparatus, and each 1st elastic members 5 and 5 are screw | thread N1, N1, N1, N1 Each is fixed at four locations. The first elastic member 5 is made of steel, and extends below the movable frame 12 so as to protrude forward from the movable frame 12.

  A lower limit stopper rail 7 formed by bending a metal plate is attached to the front end portion of the first elastic member 5 with screws N2, N2, N2, and N2. The lower limit stopper rail 7 is a member that is long in the key arrangement direction, and is disposed below the stopper contact piece 2c over the entire key. On the lower limit stopper rail 7, a long lower limit felt 71 (FIG. 3) is adhered and disposed so as to face the lower end 2c1 of the stopper contact piece 2c of all keys.

  Further, an upper limit stopper rail portion 122 extending in the key arrangement direction along the base portion of the key guide support portion 12a is formed on the front end side of the movable frame 12, and on the lower surface of the upper limit strut rail portion 122, all keys are A long upper stopper felt 122a (FIG. 3) is adhered and disposed so as to face the flange upper end 2c2 of the stopper contact piece 2c.

  As shown in FIG. 4, the extension washer 6 fixed to the lower part of the movable frame 12 together with the first elastic member 5 is formed by punching and bending a metal plate. A pair of arm portions 61 and 61 fixed to opposing portions of the elastic members 5 and 5 and a connecting portion 62 for connecting the rear end portions of the arm portions 61 and 61 are integrally formed. The arm portions 61 and 61 have a U-shaped vertical cross-sectional shape in the key arrangement direction, and have rigidity against bending stress.

  A second elastic member (plate spring) 8 made of steel and extending forward (from the distal end side of the key 2) from the connecting portion 62 is secured to the connecting portion 62 of the extension washer 6 by a screw N3. ing. The second elastic member 8 to be detected is disposed in the gap between the first elastic members 5 and 5, and the front end portion 8 a is brought into contact with the horizontal bending portion 7 a of the lower limit stopper rail 7 from below, thereby the front end portion 8 a. It is elastically deformed so that the side is slightly curved downward. Thus, the front end portion 8a of the second elastic member 8 to be detected is always in contact with the adjusting stopper rail 7 (horizontal bending portion 7a). A position detection sensor 9 is attached to a position closer to the front of the movable frame 12, and a sensing rod 9a of the position detection sensor 9 protrudes from a lower portion of the position detection sensor 9 and a tip thereof is a second elastic member to be detected. 8 is contacted.

  With the above configuration, when the key 2 is not pressed (released), the return spring 21 biases the front end of the key 2 upward, and the upper end 2c2 of the collar portion of the stopper abutting piece 2c acts as the upper limit stopper felt 122a. It comes into contact with the non-key-pressed position. When the key 2 is depressed, the lower end 2c1 of the stopper abutting piece 2c abuts on the lower limit stopper felt 71, and a normal key depression state is obtained. That is, the key stroke of the key 2 is from the position where the stopper contact piece 2c contacts the upper limit stopper felt 122a to the position where the stopper contact piece 2c contacts the lower limit stopper felt 71.

  When a pressing force is further applied to the key 2 after this key pressing stroke, the lower limit stopper felt 71 and the lower limit stopper rail 7 are pushed down by the stopper abutting piece 2c, and the horizontal bent portion of the lower limit stopper rail 7 is pressed. The front end 8a of the second elastic member 8 to be detected is pushed down by 7a. Therefore, the second elastic member 8 to be detected is displaced downward at the position of the sensing rod 9 a of the position detection sensor 9, and this displacement amount is detected by the position detection sensor 9. The position detection sensor 9 is on the upper side of the second elastic member 8 to be detected, and the position of the position detection sensor 9 is opposite to that of the sensor C in FIG. The detection is the same, and the difference in the vertical position of this sensor is not essential.

  Here, the correspondence between the configuration of this embodiment and the configuration of FIG. 1 (the configuration surrounded by “”) will be described. The movable frame 12 is “fixed portion B”, the extended washer 6 is “support member BB”, The contact points between the horizontal bending portion 7a of the lower limit stopper rail 7 and the front end portion 8a of the second member 8 to be detected correspond to “load points F and FF”, respectively. Then, as shown in FIG. 3, the distance [L1] from the base end E of the first elastic member 5 to the load point F and the base end EE of the second elastic member 8 to be detected to the load point FF. The distance [L3] has a relationship of L3> L1, and in this embodiment, the same effect as that of FIG. 1 can be obtained.

  Instead of the detected second member (plate spring) 8 of the above embodiment, a detected member having a size similar to that of the detected second member 8 is used as a hard inelastic member (or elastic member). For example, the end portion of the detection member is supported between the first elastic members 5 and 5 while supporting, for example, the vicinity of the connecting portion 62 of the extension washer 6, and the detection member has a front end portion at the lower limit stopper rail 7. The detected member may be urged upward (clockwise in FIG. 1) so as to abut against the horizontal bending portion 7a. Thereby, it can be set as the structure of the said FIG. 2, and the effect similar to Claim 2 can be acquired.

  In the embodiment, the position for receiving the key operation force of the first elastic member 5 and the position for receiving the key operation force of the second elastic member 8 to be detected are not in direct contact with each other via the lower limit stopper rail 7. However, the two positions of the first elastic member and the second elastic member to be detected may be in direct contact with each other.

  In the above embodiment, the key operation detection device is applied to a keyboard device that also detects a rocking in the key arrangement direction, but can also be applied to a keyboard device that does not detect the rocking in the key arrangement direction.

It is a figure explaining the 1st composition operation of the key operation detecting device of the present invention. It is a figure explaining the 2nd composition operation of the key operation detecting device of the present invention. It is sectional drawing of the keyboard apparatus of the electronic musical instrument to which the key operation detection apparatus of embodiment of this invention is applied. It is the partial perspective view seen from the back side of the keyboard apparatus. It is a figure explaining the structure effect | action of the conventional key operation detection apparatus.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 2 ... Key, 5 ... 1st elastic member (A), 6 ... Extension washer (support member BB), 8 ... Detected 2nd elastic member (AA), 12 ... Movable frame (fixed part B), EE ... Base end Part

Claims (2)

A first elastic member which is displaced by key operation force, and the detected second elastic member, and a sensor for detecting a displacement amount of該被detecting the second elastic member is provided, the position for receiving the key operating force of the first elastic member The base end portion of the second elastic member to be detected is provided farther than the base end portion of the first elastic member with reference to the load point, and the load point is a position where the detected second elastic member receives the key operation force. Is in the vicinity of the load point of the first elastic member, the first elastic member and the detected second elastic member being interlocked with each other at the load point , and the detected second elastic member A key operation detecting device , wherein the displacement amount of the second elastic member to be detected is detected by the sensor at a position closer to the base end than the load point . An elastic member that is displaced by a key operation force , a detected member, and a sensor that detects the amount of displacement of the detected member, and a detected member based on a load point that is a position that receives the key operating force of the elastic member The fulcrum part which is the base end part of the elastic member is provided farther than the base end part of the elastic member, and the load point where the detected member receives the key operation force is in the vicinity of the load point of the elastic member, The elastic member and the member to be detected are interlocked with each other at the load point of both to rotate the member to be detected around the fulcrum portion, and the base end portion is more than the load point of the member to be detected. A key operation detecting device , wherein the displacement amount of the detected member is detected by the sensor at a position close to .

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