WO2009015521A1

WO2009015521A1 - A keyboard of an electronic piano with touch feeling of quadric variation of gravity

Info

Publication number: WO2009015521A1
Application number: PCT/CN2007/002546
Authority: WO
Inventors: Xianmin Li; Xueheng Li
Original assignee: Xianmin Li; Xueheng Li
Priority date: 2007-08-01
Filing date: 2007-08-23
Publication date: 2009-02-05
Also published as: CN201075285Y

Abstract

A keyboard of an electronic piano with touch feeling of quadric variation of gravity includes a keyboard frame(1), keys(2), weights(5) of the key(2), a lever supporting rod(12), a limit pin(7), an electroconductive rubber(10), a casting die (11) for the electroconductive rubber(10), a magnet (3)and a ferromagnet(4) attracted to the magnet(3) mounted on the bottom part of the playing end of the key(2) and the corresponding position of the keyboard frame(1).

Description

Electronic piano playing keyboard with secondary gravity change feeling

The invention relates to an electronic piano playing keyboard with a second gravity changing hand, which can be widely used in a playing keyboard used for a keyboard, an electronic piano and a digital piano, which can play a keyboard like a traditional mechanical piano. The effect of the second gravity change feel.

Background technique

Electronic pianos and digital pianos appeared in Japan in the early 1980s. After more than 20 years of development, the production and sales of electronic pianos and digital pianos in developed countries are increasing at a rate of 25% per year, while the production and sales of traditional mechanical pianos are declining at a rate of 25%. The Chinese market has only produced domestic electronic pianos and digital pianos since the end of the 20th century. However, in just a few years, at present, it has developed into an annual production and sales of nearly 100,000 pianos. With the rapid development of science and technology, electronic pianos and digital pianos will occupy 80%-90% of the market of traditional mechanical pianos. Just as quartz electronic watches have squeezed 90% of the market for mechanical watches, this will be the inevitable development of technology.

However, there are currently three reasons for hindering the rapid development of electronic pianos and digital pianos: one is to play the keyboard feel; the second is the performance performance of the keyboard playing strength; the third is the timbre harmonic spectrum simulation problem, both with traditional machinery There is a gap in the piano.

Among them, the keyboard feel is the most prominent, in the history of more than 20 years of development of electronic pianos and digital pianos, large companies in Japan and other countries. For example, YAMAHA, KAWAI> ROLAND and other companies' electronic pianos and digital piano keyboards are only used to produce keyboards using the general principle of leverage and counterweight to form a single gravity design principle. The problem of keyboard playing is the same as that of a traditional mechanical piano. At present, the mechanical piano has the feeling of secondary gravity change formed by the structure of the action, and its magnitude is roughly as follows: The middle key of the middle movement has a resistance of about 110 grams at the beginning. When the key moves down by 2/3-3/4, the resistance will decrease by 1/2 or more, less than 50 grams.

There have also been manufacturers who retain the mechanical stringing "on-the-line system" on the keyboard of the electronic piano to obtain the feeling of secondary gravity change, but the cost is too high, bulky, bulky and cannot be promoted and popularized.

Summary of the invention

SUMMARY OF THE INVENTION An object of the present invention is to design an electronic piano playing keyboard having a simple structure and having a secondary gravity change hand. It can be used in the keyboard of the keyboard, electronic piano, and digital piano.

1

Confirmation Technical Solution of the Invention: The electronic piano playing keyboard with the second gravity changing hand of the present invention includes a keyboard bracket, a key, a key weight, a lever support bar, a limit pin, a conductive rubber, a conductive rubber pressing member, A magnet and a ferromagnetic member attracted thereto are disposed at a lower portion of the keyboard playing end and at a corresponding position on the keyboard tray.

The electronic piano playing keyboard having a second gravity change hand, the magnet is a permanent magnet.

The electronic piano playing keyboard having a secondary gravity change hand, the magnet may also be an electromagnet.

The electronic piano playing keyboard with the second gravity changing hand feels that the suction force of the magnet ensures the ratio of the critical gravity of the key drop to the critical gravity of the rebound is >2:1.

Advantages of the Invention - The invention has a simple structure, and skillfully utilizes the combined action of magnetic force and counterweight to make the electronic piano playing keyboard have the secondary gravity change feeling formed by the mechanical piano action structure, and can be used for electronic piano, electronic piano, digital The keyboard for piano playing is an innovative technology worldwide. This technology will greatly promote the rapid development of electronic pianos and will be an epoch-making technological creation.

DRAWINGS

Figure 1 is a schematic view of an embodiment of a single lever key structure.

2 is a schematic view of an embodiment of a double lever key structure.

3 is a schematic view of an embodiment of an electromagnet structure.

detailed description

The invention is designed according to the scientific principle that the magnetic attraction between the magnetic body and the displacement force is inversely proportional to the square of the distance, so that the key can obtain the feeling of secondary gravity change during the playing.

The electronic piano playing keyboard with the second gravity changing hand of the invention comprises a keyboard bracket, a piano key, a key weight, a lever support bar, a limit pin, a conductive rubber, a conductive rubber pressing piece, a printed circuit board, a limiting felt The pad is provided with a magnet and a ferromagnetic member attracted to the lower portion of the key playing end and the corresponding position on the keyboard bracket. The magnet is a permanent magnet or an electromagnet. The suction of the magnet ensures the ratio of the critical gravity of the key drop to the critical gravity of the rebound >2: l o

1 is a single lever key structure embodiment of the present invention: The present invention includes a keyboard holder 1, a key 2, a weight 5 at the end of the key, and a limited pin 7 on the lever support bar 12, and the conductive rubber 10 is arranged for printing. On the circuit board 13, a conductive rubber pressing member 11 is fixed to the key 2, and a ferromagnetic member 4 is disposed at a lower portion of the playing end 2.1 of the key 2, and a magnet 3 is disposed at a corresponding position on the keyboard holder 1. 6 is the keyboard bracket 1 rear bar key limit cushion, 8 is The limit pin of the playing end of the key, 9 is the front key limit cushion of the keyboard bracket 1. 2 is an embodiment of a double lever key structure: including a keyboard bracket 1, a key (first lever) 2, a weight iron member (second lever) under the key, a first lever fulcrum 7, and a conductive rubber 10 disposed at On the printed circuit board 13, the conductive rubber pressing member 11 is fixed to the weight iron member (second lever) 5, 16 is a support shaft of the weight iron member (second lever) 5, and has a magnet at the lower portion of the key playing end 2.1. 3. A ferromagnetic member 4 is disposed at a corresponding position on the keyboard tray 1. 6 is a limit cushion of the weight iron member 5, 8 is a limit guide post of the keyboard playing end 2.1, and 9 is a front end key limit cushion of the keyboard bracket 1.

Fig. 3 illustrates an embodiment using an electromagnet in a single lever key structure embodiment: Each component is the same as Fig. 1, only 3 is an electromagnet, and 3.1 is a coil of electromagnet 3.

Working principle: The present invention is designed using the principle that the attraction between the magnet and the ferromagnetic member is inversely proportional to the square of the distance. When the key is pressed, the drop is in the range of 2/3~3/4. The gravity of the key is mainly the weight 5 is working. When the height exceeds 2/3~3/4, the ferromagnetic piece 4 and the magnet The magnetic attraction force between 3 increases rapidly, and the gravity of the key at this time is equal to the gravity of the weight 5 minus the magnetic attraction. It can fully achieve the effect of the secondary gravity change formed by the structure of the mechanical piano action.

Obviously, the present invention is suitable for use with a playing keyboard of any structure, and is not limited to the above two. The position of the magnet of the present invention is adjustable at the playing end of the key 2, and the magnetic force of the magnet can be adjusted according to different keyboards, and the positions of the magnet and the ferromagnetic member can also be switched up and down. However, the size of the suction is based on the principle that the ratio of the critical gravity of the key drop to the critical gravity of the rebound is >2:1. Under the condition that this condition is satisfied, it can be arbitrarily changed.

The present invention can be used in a keyboard for electronic piano, electronic piano, and digital piano playing, and can be used in a 37-key to 96-key playing keyboard.

The core of the present invention is to provide a magnet and a ferromagnetic member attracted to the lower portion of the keyboard playing end and the corresponding position on the keyboard tray, and the magnetic attraction force is used to form a secondary gravity change hand. Therefore, any use of magnetic attraction to form a secondary gravity change feel, regardless of its structure, is within the scope of the present invention.

Claims

Rights request

1. An electronic piano playing keyboard with a second gravity change hand, including a keyboard bracket, a key, a key weight, a lever support bar, a limit pin, a conductive rubber, a conductive rubber press, a printed circuit board, and a limit The mat is characterized in that: a magnet and a ferromagnetic member attracted thereto are disposed at a corresponding position on the lower portion of the key playing end and the keyboard bracket.

The electronic piano playing keyboard having a second gravity varying hand according to claim 1, wherein the magnet is a permanent magnet.

The electronic piano playing keyboard having a second gravity varying hand according to claim 1, wherein the magnet is an electromagnet.

4. An electronic piano playing keyboard having a second gravity varying hand according to claim 1 or 2, wherein: the suction force of the magnet ensures that the ratio of the critical gravity of the key drop to the critical gravity of the rebound is > 2:1.

5. The electronic piano playing keyboard with a second gravity change hand according to claim 3, wherein: the suction force of the magnet ensures that the ratio of the critical gravity of the key drop to the critical gravity of the rebound is >2:1.