JPH089754Y2 - Electronic drum - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to an electronic drum which is a device for generating percussion sound such as various drums by electronic sound by hitting a pad with a stick.

[Summary of the Invention] In this invention, in an electronic drum having a pad on the upper surface of the main body, the lower surface of the pad is made flat and a reinforcing plate is adhered to the substantially entire surface of the pad, and a vibration sensor is closely attached to the central portion of the reinforcing plate. In addition, the pad thickness is gradually increased from the peripheral portion toward the central portion to reduce the variation in sensitivity due to the striking position within the same pad.

[Conventional technology]

The electronic drum is provided with at least a pad that is struck by a stick and a signal generating unit that generates a trigger signal by detecting the impact vibration, and is similar to percussion instruments such as various drums selected in advance in synchronization with the trigger signal. This is a device for electronically generating tones and envelope musical tones (hereinafter referred to as "percussion instrument sounds"). Since various kinds of full-fledged electronic drum sounds can be obtained with simple operations, drama and It is widely used by vocalists and keyboardists as well as parka songists.

Conventionally, such an electronic drum is system-configured by an individual pad unit, a stand for supporting the pad, a stick for hitting the pad, a sound source unit having a sound source section and an amplifier, a speaker unit, and the like. It was

However, in recent years, as a simpler electronic drum, a plurality of pads on the main body and a signal generating means for detecting a percussion vibration of at least each pad to generate a trigger signal and preferably a signal according to the intensity of the percussion, or In addition, an integrated type has also been developed that incorporates a sound source unit that electronically produces percussion instrument sound in response to the signal.

For such a conventional electronic drum, for example, as shown in JP-A-58-18699, neoprene, vinyl, etc. are provided at symmetrical positions on a case member formed of a resin such as ABS. A plurality of (for example, four) disk-shaped pads formed of the elastic material of the above is attached, and the piezoelectric ceramic is mounted on a resin-made support plate which is assembled to this case member at intervals through a plurality of elastic packings. A vibration sensor made of a disk is placed, and an elastic spacer such as neoprene or foam is interposed between the pad and the vibration sensor in a compressed state to transmit the vibration of the pad to the vibration sensor.

[Problems to be solved by the device]

However, in such a conventional electronic drum, the disk-shaped pad has a uniform thickness over the entire surface, and a part of the center thereof is connected to the vibration sensor via the elastic spacer. However, even within the same pad, if the striking position by the stick is different, the sensitivity of the vibration sensor will vary widely, and if the part other than the center is tapped lightly, the output of the vibration sensor will hardly be obtained. There was a point.

In order to solve such a problem, the present applicant first
A hitting body formed in a spherical shape is provided on the cushion material,
An application was filed for an electric striking body in which a pick-up was vertically embedded in the cushion material at positions at substantially equal distances from the respective surfaces of the striking body (see Japanese Utility Model Publication No. 59-37828).

However, in the above-mentioned electric hitting body, the hitting to the hitting body is transmitted directly to the pick-up which is the vibration sensor through the cushion material so as to be detected. In order to reduce the variation in the sensitivity of the pick-up depending on the striking position in such a configuration, the distance between the striking surface and the pick-up must be equal, and the thickness of the cushion material must be rapidly increased from the peripheral portion to the central portion. It is necessary to make the striking surface hard to hit, which hinders playability.

The present invention has been made in order to solve such a problem, and an object thereof is to reduce variations in sensitivity depending on a hitting position in a pad of an electronic drum without impairing playability.

[Means for solving the problem]

In order to achieve the above object, the present invention provides an electronic drum including a pad on the upper surface of the main body, and a signal generating means for detecting a percussion vibration of the pad to generate a percussion instrument sound. A flat plate is formed and a reinforcing plate is closely arranged on the substantially entire surface thereof, and a vibration sensor is closely arranged near the central part of the reinforcing plate, and the thickness of the pad is changed from the peripheral part to the central part. It is gradually thickened toward the end.

[Action]

With this configuration, since the impact vibration of the pad is transmitted to the vibration sensor via the reinforcing plate by the configuration as described above, the sensitivity of the vibration sensor based on the difference in the impact location of the pad can be increased without increasing the size of the vibration sensor. It is possible to reduce variations.

Moreover, since the thickness of the pad is gradually increased from the peripheral portion toward the central portion to form a convex lens shape, when the pad central portion is hit, the vibration transmitted to the vibration sensor is more than that when the peripheral portion is hit. The attenuation rate becomes large, and the variation in the sensitivity of the vibration sensor can be further reduced by only slightly increasing the thickness of the central portion, and the playability is also improved.

〔Example〕

Embodiments of the present invention will be described below with reference to the accompanying drawings.

FIG. 1 is a plan view of an electronic drum showing an embodiment of the present invention, FIG. 2 is a side view showing a part of the electronic drum in a cutaway state, and FIG. 3 shows two sticks used in this electronic drum.

The main body 10 of the electronic drum is composed of an upper case 1 and a lower case 2, which are molded from a resin such as ABS.

As shown in FIG. 1, on the upper surface of the upper case 1, four pads 3 each having a vibration sensor to be described later on the left side are mounted at equal intervals vertically and horizontally, and an operation panel 7 and a speaker are provided on the right side thereof. A speaker grill 8 having 18 attached inside is arranged.

Its operation panel 7, for example a bass drum, snare drum, four Juan click Chillon keys for selecting various percussion instruments such as cymbals 4 _A to 4 _D and eight select key 4a
~ 4h, 4 rhythm select keys 5a to 5d for selecting the type of auto rhythm, switch 5 _S for instructing the start / stop of the auto rhythm, power on / off and volume control. The operator 6 which also serves is provided.

On the other hand, on the bottom surface of the lower case 2, as shown in FIG.
A reinforcing rib 9 which is recessed from the outer surface is provided, and two staves are formed by the groove having a U-shaped cross section formed by the rib 9.
A stack storage portion 2a capable of storing 20 (FIG. 3) is formed.

Further, a boss 13 for screwing the upper case 1 is formed so as to be connected to the reinforcing rib 9 formed on the lower case 2, and the boss hole 13a is made to communicate with the stack accommodating portion 2a by a space portion. A finger insertion portion is used when the 20 is taken out, and the lower case 2 and the upper case 1 are integrally fixed to each other by a plurality of setscrews 14 partially using this boss 13.

Reference numeral 16 is a foot portion provided on the bottom surface of the lower case 2, and 17 is an external terminal provided on the side surface of the main body such as a MIDI standard signal output terminal, an AC adapter terminal, and an external speaker terminal.

Although not shown, each pad 3 is provided in the main body 10 by a vibration sensor attached to each pad 3.
The signal generation circuit that detects the impact vibration by the stick 20 and generates a trigger signal and a signal according to the intensity of the impact, and an electronic signal with a magnitude according to the intensity of the impact in synchronization with the trigger signal. It also has a built-in sound source and amplifier that generate various percussion instrument sounds.

In the electronic drum constructed as described above, four types of percussion instrument sounds can be selected from 32 types of sound sources and arbitrarily set to the four pads 3.

For example, four fan click Chillon key 4 _A to 4 _D to Yotsute eight select key 4a provided on the operation panel 7 of FIG. 1
Each of the select functions of ~ 4h can be switched to four kinds, and 32 kinds of sound sources can be selected by the combination of the function key and the select key.

Then, while pressing one of the function keys 4 _A to 4 _D and one of the select keys 4 a to 4 h with the finger of one hand, the stick 20 held by the other hand is used to push the pad 3
When is hit, the sound source (bass drum, snare drum, cymbal, etc.) selected for the pad 3 is set.

In this way, if the sound source (percussion instrument sound) is selected and set in each of the four pads 3, when the intended pad 3 is hit by the stick 20 during performance, the strength of the hit is obtained at that timing. A desired percussion instrument sound corresponding to the above is generated and emitted from the speaker 18.

After the performance, the two stacks 20 can be stored in the stack storage portion 2a provided on the bottom of the lower case 2 of the main body.

Next, the mounting structure of each pad 3 and the vibration sensor for detecting the impact vibration of the pad 3 in this embodiment will be described with reference to FIGS. 4 and 5.

Each pad 3 is made of an elastic member such as neoprene,
As shown in the figure, the lower surface is made flat and four legs 3b are projected on the outer periphery at equal angular intervals. High rigidity such as an iron plate is provided on almost the entire lower surface excluding each foot 3b. The reinforcing plate 11 is closely attached by an outsert or the like, and the vibration sensor 12 made of a piezoelectric ceramic disk or the like is closely attached by a double-sided tape or the like at the center of the lower surface of the reinforcing plate 11.

Further, the pad 3 is formed in a convex shape in which the central portion of the upper surface 3a is swollen by gradually increasing the thickness from the peripheral portion toward the central portion.

As shown in FIG. 6, when the area of the vibration sensor 12 is too small, the sensitivity varies greatly depending on the hitting positions of the central portion and the peripheral portion even within the same pad surface. The effect of suppressing variations does not improve any further.

On the other hand, since the cost of the vibration sensor is almost proportional to its area, it is desirable to set the size of the minimum area A with a small variation obtained from the characteristic curve shown in FIG.

Referring again to FIG. 4, a spacer is provided on the lower surface of the upper case 1.
A plurality of setscrews 23 are used to fix a base member 22 made of a plate material having a high density such as an iron plate at a slight interval with a plurality of setscrews 23, and as shown in FIG.
A through hole 22a for inserting the 3b is formed.

Each foot 3b of the pad 3 has a substantially conical tip,
A circumferential groove 3c that fits into the through hole 22a is provided.

Therefore, the foot 3b of each pad 3 is inserted into the through hole 22a of the base member 22.
And then press-fit, the circumferential groove 3c fits into the through hole 22a, and the pad 3 is held by the base plate 22 so as not to come off easily, and each foot 3b is formed into a circular shape formed on the upper case 1. The upper surface 3a of each pad 3 slightly protrudes from the upper surface of the upper case 1 by being inserted through the opening 1a in a non-contact state.

As described above, according to the above-described embodiment, the foot 3b of each pad 3 is inserted into the through hole 22a of the base plate 22 fixed to the upper case 1.
Each pad 3 can be attached to the main body 10 only by press-fitting, and since the vibration sensor 12 is in close contact with the lower surface of each pad 3, the attachment structure is simple and the assembling is good.

Since the vibration sensor 12 is mounted on the reinforcing plate 11 that is in close contact with the lower surface of the pad 3, the impact vibration of the pad 3 by the stick 20 is surely transmitted through the reinforcing plate 11 to the vibration sensor 12.
Even if the impact position is outside the center of the pad 3, the vibration is detected by the vibration sensor 12 with high sensitivity.

Further, since the pad 3 is formed in a convex shape (convex lens shape) in which the thickness of the central portion of the upper surface is thicker than the thickness of the peripheral portion, the pad 3 is moved to the vibration sensor 12 as the hitting position approaches from the peripheral portion to the central portion. The damping rate of the transmitted percussion vibration is slightly increased, and substantially uniform vibration detection sensitivity can be obtained over the entire surface of the pad 3.

Furthermore, each pad 3 does not contact the resin upper case 1, but only contacts the base member 22 with a very small contact area by the elastic foot 3b.
The mechanical vibration of the pad 3 hit by the
It is only slightly transmitted to 22.

Since the base member 22 is made of an iron plate or the like having a higher density than the upper and lower cases 1 and 2, the slight transmitted vibration is almost completely absorbed by the base member 22, and the vibration of the hit pad 3 is the base. There is no possibility that the vibration sensor 12 is transmitted to the other pad 3 through the member 22 and is closely attached to the pad 3 to detect the vibration.

Although the vibration sensor 12 is provided in close contact with the lower surface of the reinforcing plate 11 which is in close contact with the lower surface of the pad 3 in the above embodiment, the present invention is not limited to this, and as shown in FIG. It may be provided in close contact with the upper surface and sandwiched between the lower surface of the pad 3 and the upper surface.

Also, if the foot 3b of the pad 3 is made of the same material as that of the pad 3 and integrally molded, the number of parts is reduced and the assemblability is improved.

The embodiment described above is an example in which the present invention is applied to an electronic drum in which a sound source section, an amplifier and a speaker are all built-in, but the present invention is not limited to this, one without a speaker, and an amplifier and a speaker are built-in. The present invention can also be applied to electronic drums that do not have a built-in sound source unit.

Furthermore, the present invention can be similarly applied to an electronic drum which is also provided with a keyboard portion, a plucked portion, and the like and which can also play melody or accompaniment.

In an electronic drum having a plucked part, by having a common base member for the string and the pad, it is possible to prevent not only the pad but also the vibration of one string from being transmitted to another string. There is also an effect.

[Effect of device]

As described above, in the electronic drum according to the present invention, the reinforcing plate is arranged in close contact with substantially the entire lower surface of the pad formed in a flat shape, and the vibration sensor is arranged in close contact with the central portion of the reinforcing plate. Since the vibration of the pad is transmitted to the vibration sensor through the reinforcing plate, it is possible to easily detect the impact received from almost the entire surface of the pad as in the central part without increasing the size of the vibration sensor. It is possible to reduce the variation in the sensitivity of the vibration sensor due to the difference in the hit location.

Also, since the thickness of the pad is gradually increased from the peripheral portion toward the central portion, when the pad central portion is hit, the damping rate of vibration transmitted to the vibration sensor becomes larger than when the peripheral portion is hit, By slightly increasing the thickness of the central portion, the variation in the sensitivity of the vibration sensor can be further reduced, and at the same time, the pad surface is easily hit and the playability is improved.

[Brief description of drawings]

FIG. 1 is a plan view showing an embodiment of the present invention, FIG. 2 is a side view showing a portion of the device, and FIG. 3 is a plan view of a stick used in this electronic drum. FIG. 1 and 2 are enlarged cross-sectional views of the essential parts showing the pad mounting structure of the embodiment shown in FIGS. 1 and 2, FIG. 5 is an exploded perspective view of the same, and FIG. 6 shows variations in sensitivity of the vibration sensor depending on the hitting portion of the pad. FIG. 7 is a diagram showing the relationship with the area of the vibration sensor, and FIG. 7 is a schematic view showing another different example of the mounting state of the vibration sensor on the pad. 1 ... Upper case, 1a ... Opening part 2 ... Lower case, 3 ... Pad 3b ... Pad foot, 7 ... Operating panel 8 ... Speaker grille, 10 ... Main body 11 ... Reinforcement plate, 12 ... Vibration sensor 20 ... Stick, 21 ... Spacer 22 ... Base member, 23 ... Set screw

Claims (1)

[Scope of utility model registration request] 1. An electronic drum comprising a pad on the upper surface of a main body, and a signal generating means for detecting a percussion vibration of the pad to generate a percussion instrument sound, wherein the lower surface of the pad is formed flat. A reinforcing plate is disposed in close contact with the substantially entire surface thereof, a vibration sensor is disposed in the vicinity of the central portion of the reinforcing plate in close contact, and the thickness of the pad is gradually increased from the peripheral portion toward the central portion. An electronic drum that is characterized.