JPH04119496U - Electronic piano - Google Patents

Abstract

(57) [Summary] (with modifications) [Purpose] To provide an electronic piano that can widen the bass sound reproduction band without damaging the appearance. [Structure] The space consisting of the main body, left and right legs, and pedal box is equipped with a curtain plate and an exciter, and the music signal output from the amplifier is inputted separately to the speaker and the exciter to produce sound. A music signal sent to the voice coil 10b of the vibrator drives a weight 10c by a magnetic circuit 10a. The weight of the weight 10c and the spring load of the support body 10d having spring properties are set so as to resonate at an arbitrary frequency. Voice coil 10b
The music signal to the drum causes the weight 10c to vibrate, and the magnetic circuit 10a also vibrates due to the reaction of the driving force, and this vibration generates sound using the curtain plate 9 as a diaphragm. The sound pressure from the vibrator 10 is smaller than the sound pressure from the speaker 4, but due to the fact that the vibrator 10 resonates at a predetermined frequency and the resonance between the vibrator 10 and the spring of the curtain plate 9, Almost the same sound pressure as the speaker 4 is obtained, and when combined with the sound pressure from the speaker, the bass sound reproduction band becomes wider.

Description

[Detailed explanation of the idea]

0001

[Industrial application field]

The present invention relates to an electronic piano with a wider bass sound reproduction band.

0002

[Conventional technology]

In recent years, electronic pianos have become heavier, require tuning, and are noisier than acoustic pianos. The market size is expanding as a product that solves problems such as.

0003 A conventional electronic piano will be explained below. FIG. 5 is a partial sectional view showing the structure of a conventional electronic piano. In Figure 5, 1 is the key On the board, 2 is a sound source with many music waveforms built into the ROM, 3 is an amplifier, and 4 is an amplifier. The speaker 5 is a microcomputer for control.

0004 The operation of the electronic piano configured as above will be explained below. . First, when you press any key on keyboard 1, the information is transferred to the microcomputer. The microcomputer 5 extracts the specified music waveform from the sound source. , to the amplifier. The music signal amplified by the amplifier is sent to the speaker, and the sound is pronounced as. In general, digital pianos are close to acoustic pianos. In order to make the sound more appealing, the speaker 4, which is not present on an acoustic piano, is placed small so as not to make it stand out. caliber speakers are used.

[0005]

[Problem that the idea aims to solve]

However, the above conventional configuration uses a small diameter speaker, so It is said that the bass reproduction band cannot be widened and the sound cannot be reproduced according to the music waveform. It had some problems.

[0006] This invention solves the above-mentioned conventional problems and is an electronic device that expands the bass sound reproduction band. The purpose is to provide pianos.

[0007]

[Means to solve the problem]

To achieve this purpose, the electronic piano of this invention consists of a main body, left and right legs, and a pedal. It has a structure in which a foot space made up of a box is equipped with a curtain plate and an exciter.

[0008]

[Effect]

With this configuration, bass sounds that could not be reproduced in the past can be produced by resonance between the curtain plate and the exciter. Can be played.

[0009]

【Example】

An embodiment of the present invention will be described below with reference to the drawings.

0010 In Fig. 1, 6 is the electronic piano body, 7 is the left and right legs, 8 is the pedal box, and 9 is the electronic piano body. 1 is a curtain plate, and 10 is a vibrator attached to the curtain plate 9.

[0011] The operation of the electronic piano configured as described above is explained using Figures 2 and 3. explain. Figure 2 is a block diagram showing the signal from the keyboard to the amplifier. The flow is the same as before. The music signal output from the amplifier is filtered The output is divided into the output to the vibrator and the output to the vibrator, and each is input to generate sound. Figure 3 is FIG. 3 is a cross-sectional view of the curtain plate 9 and the vibrator 10. FIG. The structure of the exciter is similar to that of a dynamic speaker. Similarly, 10a is a magnetic circuit, 10b is a voice coil, 10c is a weight, and 10 d is a support having spring properties, and 10e is a frame. In addition to voice coil 10b The received music signal drives the weight 10c by the magnetic circuit 10a. weight The spring load of the support 10d having a weight of 10c and spring properties constitutes a resonant system, and any arbitrary A constant is set so that it resonates at the frequency. added to voice coil 10b The music signal vibrates the weight 10c and at the same time, due to the reaction of the driving force, The magnetic circuit 10a is also vibrated. The vibration transmitted to the magnetic circuit 10a is transmitted to the frame 10. The sound is transmitted to the curtain plate 9 via e, and the curtain plate 9 is used as a diaphragm to produce sound. From speaker 4 Although the sound pressure emitted from the exciter 10 is smaller than the emitted sound pressure, the exciter 10 Resonance occurs at a predetermined frequency, and due to the weight of the vibrator 10 and the springiness of the curtain plate 9. By configuring the system, it is possible to obtain almost the same sound pressure as speaker 4, and As shown in Figure 4, when combined with the sound pressure from Can be configured. In addition, since the vibrator 10 can be attached to the back side of the curtain plate 9, It does not spoil the appearance of an electronic piano.

0012 As described above, according to this embodiment, the pedal box consists of the main body, left and right legs, and a pedal box. By installing a curtain plate and an exciter in the foot space, the bass sound can be improved without spoiling the appearance. The playback band can be expanded.

[0013] In the embodiment, the input of the exciter 10 is the output from the amplifier divided by a filter. However, the parts below the sound source are configured in a separate system, and the input of the exciter 10 is connected to the speaker 4. It goes without saying that it may be separated from the input.

[0014]

[Effect of the idea]

As described above, the present invention focuses on the foot space consisting of the main body, left and right legs, and pedal box. By installing a plate and a vibrator, the bass sound reproduction band can be expanded without damaging the appearance. This makes it possible to realize an excellent electronic piano that can perform the following functions.

[Brief explanation of drawings]

[Fig. 1] Structural sectional view of an electronic piano according to the first embodiment of the present invention

[Fig. 2] Block configuration diagram of the electronic piano in the first embodiment

[Fig. 3] Cross-sectional view of the curtain plate and vibrator of the electronic piano in the first embodiment

[Figure 4] Frequency characteristic diagram of the electronic piano of the present invention

[Figure 5] Structural cross-sectional view of a conventional electronic piano

[Explanation of symbols] 1 keyboard 2 Sound source 3 Amplifier 4 Speaker 5 Microcomputer 6 Electronic piano body 7 Left and right legs 8 Pedal box 9 Curtain board 10 Vibrator 10a Magnetic circuit 10b voice coil 10c weight 10d Support 10e frame

Claims (1)

[Scope of utility model registration request] [Claim 1] An electronic device comprising: a curtain plate disposed in a space consisting of a main body, left and right legs, and a pedal box; and an exciter whose front end surface is integrally fixed to the curtain plate. piano.