CN209591499U - Indicate the piano of player's key mode - Google Patents

Abstract

The utility model discloses a kind of piano for indicating player's key mode, and the gap balanced between rail hole and balance track bolt is provided with pressure sensor.The outer end of key is provided with installation cavity, the installation cavity is set the channel inside key and is connected to balance rail hole, power supply, acceleration transducer are provided in installation cavity, close to inductive switching portion and light emitting diode group, the outer end of balance beam is arranged in close to switch triggering portion for this.Light emitting diode is connected to power supply through switching circuit, which is electrically connected with acceleration transducer, close to inductive switching portion and pressure sensor respectively.The utility model has the advantages that whether the piano of instruction player's key mode using the utility model, can intuitively indicate the mode for pressing key, facilitate the key mode for judging beginner correct.Structure is simple, convenient for manufacture, will not influence the main structure of piano key, will not influence practice.

Description

a piano that tells the player how to press the keys

technical field

The utility model relates to a piano, a harpsichord, an upright piano or a similar stringed instrument with one or more keyboards, in particular to a piano that indicates the way a player presses keys.

Background technique

The piano is a kind of keyboard instrument with the reputation of "King of Musical Instruments". The piano is composed of 88 keys, and each key corresponds to a tone. Strike the strings to produce a corresponding sound.

In piano performance, if the key is pressed with a large force, the angle is large, and the speed is fast, the piano will emit a light and bright sound; if the force of the key is small, the angle is small, and the speed is slow, the piano will produce a soft and soft sound. Therefore, a skilled player will skillfully control the strength, angle and speed of the keys according to the artistic conception of the piano music.

Due to the fast speed of piano playing, it is difficult to judge the way the player presses the keys from the movements of the hands, so it can only be judged from the sound. Judging the button mode from the sound requires an excellent pitch, which is very difficult for beginners or people with poor pitch.

Utility model content

In order to solve the above technical problems, the utility model provides a piano that indicates the way the player presses the keys. Through the combination of the light emitted by the LED tube group arranged on the keys, it indicates the way the practitioner presses the keys, which is convenient for beginners and People with poor pitch judge the way the keys are pressed.

The technical solution is as follows:

A piano that indicates the way the player presses the keys is provided with a plurality of piano keys, the piano keys are provided with keys, and the keys are placed on a balance beam. The matched balance rail hole, the balance rail bolt is inserted into the balance rail hole, and the key is that a pressure sensor is arranged in the gap between the balance rail hole and the balance rail bolt.

The outer end of the key is provided with an installation cavity, which communicates with the balance rail hole through the passage arranged inside the key. The installation cavity is provided with a power supply, an acceleration sensor, a proximity switch sensing part and a light-emitting diode group. The switch trigger part is arranged on the outer end of the balance beam.

The light emitting diode is connected to the power supply through a switch circuit, and the switch circuit is electrically connected to the acceleration sensor, the proximity switch sensing part and the pressure sensor respectively.

Furthermore, the pressure sensor is a thin film pressure sensor, the sensing film of the thin film pressure sensor is attached to the hole wall of the balance rail hole, and the output wire of the thin film pressure sensor passes through the channel and is connected to the switch circuit.

Furthermore, the acceleration sensor is MS9002.Dj acceleration sensor.

Furthermore, the inner end of the key is provided with a counterweight.

Furthermore, the cavity of the installation cavity is made of transparent and lightweight material.

Furthermore, the power supply, acceleration sensor, proximity switch sensing part, switch circuit and light emitting diode group are integrated on one circuit board.

Furthermore, the light emitting diode group is provided with an acceleration light emitting diode and a pressure light emitting diode, and the acceleration light emitting diode and the pressure light emitting diode correspond to the acceleration sensor and the pressure sensor respectively, and the switch circuit is provided with an acceleration voltage comparator and a pressure voltage comparator device;

The positive-phase input terminal of the acceleration voltage comparator is connected to the signal output terminal of the acceleration sensor through the first resistor, the inverting input terminal of the acceleration voltage comparator is connected to the power supply through the second resistor, and is also grounded through the third resistor;

The output end of the acceleration voltage comparator is connected to the base of the first switching transistor through the fourth resistor, the collector of the first switching transistor is connected to the power supply, and the emitter is connected to the anode of the acceleration light-emitting diode through the fifth resistor. The cathode of the LED is grounded;

The positive phase input terminal of the pressure voltage comparator is connected to the signal output terminal of the pressure sensor through the sixth resistor, the inverting input terminal of the pressure voltage comparator is connected to the power supply through the seventh resistor, and is also grounded through the eighth resistor;

The output terminal of the pressure voltage comparator is connected to the base of the second switching transistor through the ninth resistor, the collector of the second switching transistor is connected to the power supply, and the emitter is connected to the anode of the pressure light-emitting diode through the tenth resistor. The cathode of the light-emitting diode is grounded, the bases of the first switching triode and the second switching triode are respectively connected to one end of the proximity switch through the first one-way diode and the second one-way diode, and the other end of the proximity switch is grounded.

Furthermore, the light emitted by the acceleration light-emitting diode is green light, and the light emitted by the pressure light-emitting diode is red light.

Beneficial effect: adopting the piano indicating the player's key-pressing mode of the utility model can intuitively indicate the key-pressing mode, which is convenient for beginners to judge whether the key-pressing mode is correct. The structure is simple, easy to manufacture, and will not affect the main structure of the keys of the piano, and will not affect the practice.

Description of drawings

Fig. 1 is the structural representation of the utility model;

Fig. 2 is a partial enlarged view of place A in Fig. 1;

Fig. 3 is the circuit diagram of the switching circuit of embodiment one of the present utility model;

FIG. 4 is a circuit diagram of the switch circuit of the second embodiment of the present invention.

Detailed ways

Below in conjunction with embodiment and accompanying drawing, the utility model is further described.

As shown in Fig. 1 and Fig. 2, a kind of piano that instructs the player to press the keys is provided with a plurality of piano keys, and the piano keys are provided with keys 1, and the keys 1 are placed on a balance beam 2, and a balance rail is provided on the balance beam 2 Bolt 3, the key 1 is provided with a balance rail hole 4 matched with the balance rail bolt 3, and the balance rail bolt 3 is inserted into the balance rail hole 4.

An installation cavity 6 made of polycarbonate material is provided on the outer end sidewall of the key 1 . The mounting cavity 6 communicates with the balance rail hole 4 through a channel 7 . The channel 7 is arranged inside the key 1 . A circuit board is arranged in the installation cavity 6, and a power supply, an acceleration sensor 8, a proximity switch K, a switch circuit, and an ultra-small acceleration light-emitting diode 12 and a pressure light-emitting diode 13 are integrated on the circuit board, and the acceleration light-emitting diode 12 The emitted light is green light, and the light emitted by the pressure LED 13 is red light.

Wherein, the model of the acceleration sensor 8 is MS9002.Dj, the proximity switch K is an electromagnetic induction type ultra-small proximity switch K, the sensing part 9 of the proximity switch K is arranged in the installation cavity 6, and the trigger part 10 of the proximity switch K is arranged in The outer end of the balance beam 2, and the installation position is opposite to the induction part 9.

The power supply is connected to the acceleration light emitting diode 12 and the pressure light emitting diode 13 through a switch circuit, and the switch circuit is connected to the acceleration sensor 8 and the proximity switch K. The switch circuit is also connected with a membrane pressure sensor 5 , and the sensing membrane of the membrane pressure sensor 5 is attached to the hole wall of the balance rail hole 4 . The output wire of the thin film pressure sensor 5 passes through the channel 7 and is connected with the switch circuit.

The inner end of the key 1 is provided with a counterweight 11 . The counterweight 11 corresponds to a circuit board integrated with an acceleration sensor 8 , a power supply, a switch circuit, a proximity switch K, an acceleration light emitting diode 12 and a pressure light emitting diode 13 .

The light-emitting diode group is provided with an acceleration light-emitting diode 12 and a pressure light-emitting diode 13, the acceleration light-emitting diode 12 and the pressure light-emitting diode 13 correspond to the acceleration sensor 8 and the pressure sensor 5 respectively, and the switch circuit is provided with an acceleration voltage comparator U1 and pressure voltage comparator U2.

As shown in Figure 3, the positive-phase input terminal of the acceleration voltage comparator U1 is connected to the signal output terminal of the acceleration sensor 8 through the first resistor R1, and the inverting input terminal of the acceleration voltage comparator U1 is connected to the signal output terminal of the acceleration voltage comparator U1 through the second resistor R2. power supply, the inverting input terminal of the acceleration voltage comparator U1 is also grounded through the third resistor R3. By setting the resistance values of the second resistor R2 and the third resistor R3, the reference voltage of the acceleration voltage comparator U1 can be controlled.

The output terminal of the acceleration voltage comparator U1 is connected to the base of the first switching transistor T1 through the fourth resistor R4, the collector of the first switching transistor T1 is connected to the power supply, and the emitter is connected to the acceleration light-emitting diode through the fifth resistor R5 12, and the cathode of the acceleration light-emitting diode 12 is grounded.

The positive phase input terminal of the pressure voltage comparator U2 is connected to the signal output terminal of the pressure sensor 5 through the sixth resistor R6, the inverting input terminal of the pressure voltage comparator U2 is connected to the power supply through the seventh resistor R7, and is also connected to the power supply through the seventh resistor R7. Eight resistors R8 to ground.

The output terminal of the pressure voltage comparator U2 is connected to the base of the second switching transistor T2 through the ninth resistor R9, the collector of the second switching transistor T2 is connected to the power supply, and the emitter is connected to the pressure light-emitting diode through the tenth resistor R10 13, the cathode of the pressure light-emitting diode 13 is grounded, and the base of the first switching transistor T1 and the base of the second switching transistor T2 are also connected to the proximity through the first one-way diode D1 and the second one-way diode D2 respectively. One end of the switch K is connected, and the other end close to the switch K is grounded. In order to prevent the unidirectional diode from being broken down, the fourth resistor R4 and the ninth resistor R9 need to use larger resistance values, and the turn-on voltage of the first switching transistor T1 and the second switching transistor T2 is lower than the breakdown voltage of the unidirectional diode.

Embodiment 2, as shown in FIG. 4 , embodiment 2 is substantially the same as embodiment 1, the main difference is that: the base of the first switching transistor T1 is also connected to the collector of the third switching transistor T3, the third switching transistor T3 The emitter of the switching transistor T3 is grounded, the base of the third switching transistor T3 is connected to one end of the proximity switch K through the eleventh resistor R11, and the other end of the proximity switch K is connected to the power supply.

The base of the second switching transistor T2 is also connected to the collector of the fourth switching transistor T4, the emitter of the fourth switching transistor T4 is grounded, and the base of the fourth switching transistor T4 is connected through the twelfth resistor R12 It is close to the common end of the switch K and the base of the third switching transistor T3.

The specific working principle is as follows:

When the player presses the key 1, due to the effect of the lever, the installation cavity 6 can move upwards, and the acceleration sensor 8 in the installation cavity 6 can detect the acceleration of the upward movement of the installation cavity 6. Since the voltage of the voltage signal generated by the acceleration sensor 8 is directly proportional to the strength with which the player presses the key 1, when the player presses the key 1, the acceleration sensor 8 will output a voltage signal according to the force of the key. Reference voltage, the acceleration voltage comparator U1 will output a high level, so that the first triode is turned on, the acceleration light-emitting diode is energized, and emits green light. By setting the reference voltage of the acceleration as the voltage corresponding to the correct exertion of force, it is possible to judge whether the force used by the player when pressing the keys is appropriate by observing the light-emitting situation of the light-emitting diode.

When pressing the key 1, since there will be an angle between the finger and the key 1, the finger will generate a horizontal component force on the key 1, and this horizontal component force will be applied to the sensing film of the pressure sensor 5, causing the pressure sensor 5 to generate electric signal. Under the same strength, if the angle is larger, the horizontal component force is larger, and the voltage of the electrical signal generated by the pressure sensor 5 is higher. Therefore, the key angle is inversely proportional to the electrical signal voltage of the pressure sensor 5 .

When the voltage of the electrical signal of the pressure sensor 5 exceeds the reference voltage of the voltage comparator U2, the pressure voltage comparator U2 will output a high level, so that the second triode is turned on, and the pressure LED is energized to emit red light. Setting the reference voltage of the pressure voltage comparator U2 to the voltage corresponding to the correct pressing angle can determine whether the angle between the finger and the key 1 is appropriate when the player presses the key 1 by observing the pressure LED.

If the key 1 is pressed quickly, the sensing part 9 of the proximity switch K will quickly sense the trigger part 10, so that the proximity switch K is turned on, and the voltage at the base of the first triode and the second triode is lowered, thereby If the first triode and the second triode are disconnected, the acceleration light-emitting diode and the pressure light-emitting diode will be powered off rapidly, and the light-emitting time will be short. On the contrary, the light emitting time is long.

Therefore, the strength, angle and speed at which the player presses the keys can be roughly judged through the working status and light-emitting time of the acceleration LED and the pressure LED.

Finally, it should be noted that the above description is only a preferred embodiment of the utility model, and under the inspiration of the utility model, those skilled in the art can make many A similar representation, such transformations all fall within the protection scope of the present utility model.

Claims (8)

1. a kind of piano for indicating player's key mode, is provided with multiple piano keys, piano key is provided with key (1), Key (1) is placed on balance beam (2), is provided with balance track bolt (3) on the balance beam (2), is provided with and is put down on the key (1) The balance rail hole (4) that weighing apparatus rail bolt (3) matches, balance track bolt (3) insertion balance rail hole (4) are interior, it is characterised in that: described Gap between balance rail hole (4) and balance track bolt (3) is provided with pressure sensor (5)；

The outer end of the key (1) is provided with installation cavity (6), which is set the channel (7) internal in key (1) It is connected to balance rail hole (4), the induction of power supply, acceleration transducer (8), close switch (K) is provided in the installation cavity (6) Portion (9) and light emitting diode group, this is arranged close to the trigger unit (10) for switching (K) in the outer end of the balance beam (2)；

The light emitting diode group is connected to power supply through switching circuit, the switching circuit respectively with the acceleration transducer (8), Close to induction part (9) and pressure sensor (5) electrical connection of switch (K).

2. indicating the piano of player's key mode according to claim 1, it is characterised in that: the pressure sensor (5) For diaphragm pressure sensor, the sensor film of the diaphragm pressure sensor is attached on the hole wall of balance rail hole (4), this is thin The output lead of membrane pressure sensor passes through the channel (7) and connect with switching circuit.

3. indicating the piano of player's key mode according to claim 1, it is characterised in that: the acceleration transducer It (8) is MS9002.Dj acceleration transducer.

4. indicating the piano of player's key mode according to claim 1, it is characterised in that: key (1) inner end is set It is equipped with counterweight (11).

5. indicating the piano of player's key mode according to claim 1, it is characterised in that: the chamber of the installation cavity (6) Body is made of transparent light-weight material.

6. indicating the piano of player's key mode according to claim 1, it is characterised in that: the power supply, acceleration pass Sensor (8) is integrated on one piece of circuit board close to switch (K) induction part (9), switching circuit and light emitting diode group.

7. indicating the piano of player's key mode according to claim 1, it is characterised in that: the light emitting diode group is set It is equipped with acceleration light emitting diode (12) and pressure light emitting diode (13), the acceleration light emitting diode (12) and pressure shine Diode (13) is corresponding with acceleration transducer (8) and pressure sensor (5) respectively, and the switching circuit is provided with acceleration electricity Press comparator (U1) and pressure voltage comparator (U2)；

The normal phase input end of the acceleration voltage comparator (U1) connects the signal of acceleration transducer (8) through first resistor (R1) Output end connection, the inverting input terminal of the acceleration voltage comparator (U1) connect power supply through second resistance (R2), and also through the Three resistance (R3) ground connection；

The output end of the acceleration voltage comparator (U1) is through the base stage of the 4th resistance (R4) and first switch triode (T1) Connection, the collector of the first switch triode (T1) connect to power supply, and emitter connects acceleration through the 5th resistance (R5) and shines The anode of diode (12), the minus earth of the acceleration light emitting diode (12)；

The signal that the normal phase input end of the pressure voltage comparator (U2) connects pressure sensor (5) through the 6th resistance (R6) exports End connection, the inverting input terminal of the pressure voltage comparator (U2) connect power supply through the 7th resistance (R7), and also through the 8th resistance (R8) it is grounded；

The output end of the pressure voltage comparator (U2) connects through the base stage of the 9th resistance (R9) and second switch triode (T2) It connects, the collector of the second switch triode (T2) connects to power supply, and emitter connects pressure light-emitting diodes through the tenth resistance (R10) Manage the anode of (13), the minus earth of the pressure light emitting diode (13), the base stage of the first switch triode (T1) and the The base stage of two switching transistors (T2) is respectively through the first unilateral diode (D1) and the second unilateral diode (D2) and close switch (K) one end connection, close to the other end ground connection of switch (K).

8. indicating the piano of player's key mode according to claim 7, it is characterised in that: the acceleration light-emitting diodes Managing the light that (12) issue is green light, and the light that the pressure light emitting diode (13) issues is feux rouges.