A structural device of a flat-top electric piano

Abstract

The present invention relates to an electronic musical instrument device, in particular to a table-type flat-cover electric piano structure device, the top of the keyboard box is covered by a whole horizontal flip plate, and the back of the flip plate is used as a music board. The characteristics are: the flip plate is connected to the key pressing plate through a damping hinge, the keyboard weight pendulum iron sheet under the key pressing plate is arranged below the keyboard playing area, rather than the usual root of the piano key, and the long groove concave under the keyboard frame in a supine "self" shape is provided with four baffles to separate the long groove into three parts, the left and right parts are closed with the keyboard frame as the main body and the bottom plate to form left and right sound boxes for installing speakers, and the middle part is used to set the circuit PCB board, the PCB board is inverted and suspended on the keyboard frame by screws, and the bottom cabin board is arranged at the corresponding part of the bottom plate to facilitate the installation and maintenance of the PCB board. The present invention has strong practicality, novel design, compact structure, exquisite and simple appearance, simple production and maintenance, convenient use and operation, good acoustic effect, realistic hand feeling, the top cover is dustproof and serves as a music board, and can also be used as a table.

Description

Technical Field

[0001] The present invention relates to musical instruments, and more specifically to an electric piano structure device, in particular to a long-table rectangular keyboard box, wherein a whole flip cover covers the top of the long-table keyboard box, and when the flip cover is horizontal, the black and white keys are covered. After the flip cover is opened, the back side serves as a music board, and the long-table can be used as a long-table at ordinary times. Background Art

[0002] The electric piano is a derivative of an electronic piano that feels similar to a piano. Currently, some electric pianos are relatively tall in appearance, similar to the shape of a piano, with a lid to protect the keyboard, and a top cover for placing items; some electric pianos are long in appearance, with exposed keyboards and no top cover. Electric pianos only have a single function as musical instruments, and the above two types of pianos cannot be used as desks. At present, a small number of electric pianos are designed to be desk-shaped to enhance their functions. They are both musical instruments and desks, but these lids are made of two boards, one fixed and the other flipped; the inventor has disclosed a two-board flat-cover electric piano shell structure in application number 2019213617224, which can be translated with one board and flipped with the other board. Although the operation is relatively convenient than a fixed board, the desktop gap formed by the two boards due to structural limitations is not as perfect as the whole board in terms of visual appearance or cleaning. Usually, a weighted pendulum plate simulating the piano's string-strike effect is provided at the tail of an electric piano keyboard structure. In order to increase the lever ratio, the pendulum plate extends beyond the root of the key. Moreover, the root of the key itself has a geometric length of at least 10 mm. If the root of the key is too short, it will affect the playing feel. Also, because of the placement of electronic components and circuit hardware such as sound sources and speakers, the piano case is relatively wide. If a whole board is used as a flip cover, the wide flip cover will be abrupt and tall after being opened, which not only has a poor visual effect, but also blocks the sight of teachers and students in the classroom. The heavy flip cover is also easy to loosen the hinges and is very easy to fall off, with poor reliability and unsafe. Summary of the invention

[0003] The purpose of the present invention is to provide an improved flip-top electric piano structure device, in particular a table-type flat-top keyboard box, which has a whole flip cover that is easy to flip and not easy to tip over, and can also be used as a table, has excellent acoustic effects, and simulates the feel of a traditional piano.

[0004] The technical solution adopted by the present invention is as follows: Use a whole board as the flip cover of the digital piano, and the back of the flip cover is used as the music score board after it is opened. By reducing the width of the keyboard and the width of the box body; arrange the circuit components, speakers and PCB boards that are usually located behind the root of the keys under the keyboard; and arrange the counterweight iron that is usually located at the root of the keys under the front playing area of the keys, and use a metal keyboard frame as the main body. Divide the space under the keyboard frame into speaker resonance boxes to ensure the sound effect, and divide the installation compartments for circuits and PCB boards. And a bottom cabin board is provided on the bottom board to facilitate the installation and maintenance of circuits and PCB boards.

[0005] To implement the above technical solution, a digital piano structure device is designed, including a flip cover, a back board, left and right side boards, door stoppers, hanging stoppers, a bottom board, a bottom cabin board, a key pressing board, keys, swing iron pieces, combined seat boards, a keyboard frame, stoppers, damping hinges, a PCB board, etc. And the key pressing board above the roots of the black and white keys of the keyboard is connected to the flip cover through damping hinges. Its characteristics are: A cuboid keyboard box composed of a flip cover, a key pressing board, a back board, left and right side boards, door stoppers, hanging stoppers, a bottom board, a bottom cabin board, black and white keys. A whole flip cover covers the top of the keyboard box. When the flip cover is horizontal, it covers the black and white keys. After the flip cover is opened, the back is used as a music score board. Due to the damping torque of the hinge, the flip cover can stop freely in the middle when it is flipped open and closed; The roots of the plastic black and white keys are hooked to the plastic combined seat board through male and female snap fasteners. The plastic seat board also combines swing iron pieces. They are配合 with each other by a pivot point groove of the male and female type and are arranged under the middle part of the keys. The swing iron piece is in an inclined S shape. The head weight of the swing iron piece is located under the front playing area of the keys, rather than under the rear root of the keys as usual. The pivot lever fulcrum on the swing iron piece is higher than the weight of the swing iron piece. The distal weight arm is long, and the proximal arm of the contact point with the bottom surface of the key is short; The plastic seat board is fixed on the metal keyboard frame. The end face of the keyboard frame is in a supine shape like the Chinese character "ji", forming two long grooves, one in front and one behind. The front one has an upward opening, and the rear one has a downward opening. The plastic combined seat board is fastened with screws on the long groove with a downward opening. Stoppers are arranged at both ends and in the middle of the long groove to divide the long groove into three parts. The left and right parts of the keyboard frame are the main body and form closed left and right speakers with the bottom board. The bottom board is drilled and the speaker is fixed with screws. The middle part is used as a compartment for installing components such as sound source control and power amplifier interfaces and the PCB board. The PCB board is fastened and suspended on the keyboard frame with screws, and a cabin cover plate convenient for installation and maintenance is provided at the corresponding position on the bottom board.

[0006] Compared with the prior art, the present invention has a novel design, a delicate and simple style, a compact structure, and is fast and convenient for production and installation, with strong practicability. BRIEF DESCRIPTION OF THE DRAWINGS

[0007] The present invention will be further described below with reference to the drawings and embodiments.

[0008] Figure 1 It is a side view of the flip cover of the present invention in the closed state.

[0009] Figure 2 It is a front view schematic diagram of the closed flip cover of the present invention.

[0010] Figure 3 It is a front view schematic diagram of the flip cover of the present invention being opened.

[0011] Figure 4 It is a side cross-sectional schematic diagram of the flip cover plate opened according to an embodiment of the present invention.

[0012] Figure 5 It is a rear cross-sectional schematic diagram of a closed flip cover according to an embodiment of the present invention.

[0013] Figure 6 For the present invention Figure 1 perspective view.

[0014] In the figure, 1. flip cover, 2. side panel, 3. bracket, 4. cross bar, 5. hanging plate, 6. door plate, 7. damping hinge, 8. key plate, 9. piano key, 10. function panel, 11. pendulum iron sheet, 12. keyboard frame, 13. bottom plate, 14. back plate, 15. piano key scanning circuit board, 16. combination seat plate, 17. speaker, 18. speaker seat plate, 19. tweeter, 20. outer baffle, 21. bass reflex tube, 22. inner baffle, 23. PCB board, 24. bottom cabin plate. DETAILED DESCRIPTION

[0015] The present invention will be further described with reference to the accompanying drawings, and the manufacturing technology of the device will be easily understood by those skilled in the art.

[0016] Figure 1 In the figure, a flip cover (1), a side plate (2) and a bracket (3) constitute a side view of the piano body, the flip cover (1) covers the top of a table-like rectangular keyboard box, and the bracket (3) is connected to the rectangular keyboard box.

[0017] Figure 2 The diagram shows a keyboard housing composed of a flap plate (1), a side plate (2), a hanging plate (5) and a door plate (6), wherein a bracket (3) and a cross bar (4) form a stable H-shaped bracket to support the keyboard housing.

[0018] The baffle plate (5) is vertically hung on the back of the flip cover plate (1) by screw connection and is flipped together with the flip cover plate (1). Figure 3 When the flip plate (1) is opened, the stop plate (5) is attached to the back of the flip plate (1), and the inclined flip plate (1) is used to place music scores, tablet computers, etc.; the flip plate (1) is connected to the key pressing plate (8) arranged on the piano keys (9) by a damping hinge (7), and due to the damping torque of the hinge, the flip plate (1) can be freely stopped in the middle of the flipping, which is conducive to the arbitrary adjustment of the music score placement angle and prevents the flip plate (1) from closing suddenly and injuring the arm.

[0019] Figure 4 Among them, the side plate (2), the door baffle (6), the key pressing plate (8), the bottom plate (13) and the back plate (14) form the piano case with an built-in keyboard, and the keys (9), the swing iron pieces (11), the keyboard frame (12), the key scanning circuit board (15) and the combined seat plate (16) form the keyboard component. The end face of the metal keyboard frame (12) is in the shape of an inverted "ji" character, forming two long grooves, one in the front with an upward opening and the other in the back with a downward opening. The combined seat plate (16) is arranged above the long groove with a downward opening. On the side of the edge of the plastic combined seat plate (16) near the top of the keyboard frame (12), there are cylindrical convex points, which are hooked with the roots of the black and white keys (9) through plastic male and female snap fasteners to serve as the axis for the up and down swing of the keys (9). When the keys (9) are pressed down, the conductive rubber button carbon film contact points on the key scanning circuit board (15) are touched to output the key action signal; on the combined seat plate (16) below the middle of the keys, there is a cylindrical groove that mates with the cylindrical convex point in the middle of the S-shaped swing iron piece (11) in a male-female manner. The cylindrical convex point is embedded in the cylindrical groove as the axis pivot point for the swing of the S-shaped swing iron piece. When the convex point on the bottom surface of the key (9) touches the short proximal end of the axis pivot arm of the S-shaped swing iron piece (11) due to playing the key, the long distal end of the arm, the heavy hammer swing iron piece (11), rotates up and down due to the lever action. The swing iron piece (11) is located in the long groove with an upward opening, and a buffer felt strip is lined inside the long groove. The bottom surface of the long groove is connected to the bottom plate (13) of the keyboard case. The feel of playing the keys (9) is mainly affected by the weight of the heavy hammer of the swing iron piece (11), as well as the contact friction vibration between the convex point on the bottom surface of the key (9) and the axis pivot point of the S-shaped swing iron piece (11). To simulate the feeling of the friction vibration between the felt and the wood when the hammer mechanism disconnects the hammer in a piano during playing, a silica gel sleeve is provided at the axis pivot point of the S-shaped swing iron piece (11) that contacts the contact convex point on the bottom surface of the key (9) during implementation, and several protruding fine prisms are provided on the silica gel sleeve to produce a subtle friction jitter effect. To enhance the lever action, in the embodiment, the heavy hammer end iron piece of the swing iron piece (11) is stamped into a folded shape, and the folding areas are slightly different, divided into four specifications, to reflect the feel formed by the different weights from large to small of the traditional piano hammers from the bass area to the treble area.

[0020] The sound box space formed by the long groove with a downward opening of the keyboard frame (12) and the bottom plate (13) houses the mid-bass speaker (17). Figure 4 In the embodiment, to enhance the sound output power and obtain a wide-frequency sound effect, a speaker seat plate (18) is provided so that the speaker (17) does not have to be installed on the bottom plate (13), so as to expand the height of the sound box space and facilitate the selection of a mid-bass speaker with a larger magnet.

[0021] In the present invention, the width of the flip cover (1) covering the piano case is preferably 200 to 250 mm. If the width is too large, it will be too abrupt and block the view after opening. If the width is too small, the table top will be too narrow and inconvenient to use after closing. In order to prevent the flip cover (1) from tilting backward excessively and causing the piano body to fall, and to prevent the flip cover (1) from flipping down when the damping hinge (7) fails, Figure 4 In the embodiment, a maximum opening limit angle of the flip plate (1) is set, the width of the flip plate (1) is reduced to 220 mm, and only covers most of the piano body, and a 25-degree horizontal angle is set at the rear of the key plate (8), so that when the flip plate (1) is opened at the maximum angle, the back of the flip plate (1) that was originally vertical when closed, after opening, the back of the flip plate (1) is against the 25-degree inclined surface of the key plate (8), so that the maximum opening angle of the flip plate (1) in the embodiment is 115 degrees, which also reduces the stress strength of the damping hinge (7) and further improves the reliability of the piano body. In the embodiment, a groove is milled in the middle of the key plate (8), and the function panel (10) component buttons, display screen and PCB are embedded in the groove, so that the player can see them clearly and conveniently.

[0022] Figure 5 The invention is a schematic cross-sectional view of the back of a piano body composed of a flip cover (1), two side panels (2), a bottom plate (13), a bracket (3) and a cross bar (4). The flip cover (1) is connected to a key plate (8) by three to four damping hinges (7). The keyboard under the key plate (8) is fixed to the bottom plate (13) through a metal keyboard frame (12). The keyboard frame (12) is in a supine shape of a "self" and the upper part is a combined seat plate (16) and black and white keys (9). The combined seat plate (16) is located between the metal keyboard frame (12) and the keys (9). The lower part of the keyboard frame (12) is divided into three chambers by two outer baffles (20) and two inner baffles (22), wherein the left and right chambers are used as resonance sound boxes for installing mid-bass speakers (17), the outer baffles (20) and the inner baffles (22) are folded around to form right-angled connecting edges, provided with screw holes, and are in the shape of a square cover, and are provided with screw holes for connecting the keyboard frame (12) and the bottom plate (13); in the embodiment, a bass-enhancing inverted tube (21) is also provided in the sound box, and a PCB for installing components of sound source control, power amplifier and interface is sandwiched between the two inner baffles (22). The PCB board (23) is fastened with screws and hung upside down on the keyboard frame (12), and a bottom board (24) is set at the corresponding position of the bottom board (13). When installing and repairing the PCB board (23), it is only necessary to turn the keyboard box upside down, which can be done quickly and conveniently. After completion, the bottom board (24) can be closed with screws without disassembling the entire bottom board. In order to achieve a strong bass effect during implementation, the right-angled edges of the keyboard frame (12) and the outer baffle (20) and the inner baffle (22) in the left and right speaker boxes are firmly connected by screws, and the edges of the connection part are sealed with sealant. The screw holes of the combined seat plate (16) in the speaker box connected to the keyboard frame (12) are also sealed around the connection part with sealant. Figure 4 The figure shows that the tail of the keyboard frame (12) is bent into a right angle connection surface and connected to the bottom plate (13) by screws, and the gap between the contact surfaces is padded with an EVA rubber-plastic sealing strip to ensure sealing. The "J"-shaped metal sheet keyboard frame (12) is used for the speaker, and there are no air leakage holes except for connecting the outer baffle (20), the inner baffle (22) and the bottom plate (13) to seal the speaker; in other parts except for the speaker, as many geometric holes as possible are set to reduce the weight of the keyboard while ensuring the rigid structural strength of the keyboard frame (12).

[0023] In order to compensate for the high-pitched sound defect caused by the speaker (17) facing downward, the key plate (8) provided on the black and white keys (9) in the embodiment is provided with a function panel (10) in the middle for easy operation, and is also milled with concave holes at both ends, and a tweeter (19) is embedded therein, so as to obtain clear high-pitched sound quality. The function panel (10) and the tweeter (19) protrude from the face frame and button of the key plate (8), and the geometric gap is formed by the damping hinge (7) connecting the key plate (8) and the flip plate (1). In the embodiment, a groove is provided at the knob on the flip plate (1) corresponding to the function panel (10) to prevent the knob from hitting the inner side of the flip plate (1), and a decorative and indicating label is affixed to the groove.

[0024] The total height of the piano body is 750 mm, which is consistent with the height of a normal desk. The keyboard height is 710 mm, which meets the requirements of the national piano standard for keyboard height.

[0025] In summary, the present invention has strong practicability, novel design, compact structure, exquisite and simple appearance, simple production and maintenance, convenient operation, good acoustic effect, realistic hand feeling, and the piano table can meet individual needs.

Claims

1. A table-type flat-top electric piano structure device, comprising a flip cover plate, a key plate, a back plate, a side plate, a door stop plate, a hanging stop plate, a bottom plate, a bottom deck plate, piano keys, and a damping hinge, and the key plate above the root of the black and white keys is connected to the flip cover plate through the damping hinge, and its characteristics are: A rectangular strip table - type keyboard case composed of a flip - cover plate, a key - pressing plate, a back plate, side plates, a door baffle, a gear - hanging plate, a bottom plate, a bottom cabin plate, and black - and - white piano keys. A whole flip - cover plate covers the top of the strip table - type keyboard case. When the flip - cover plate is horizontal, it covers the black - and - white piano keys. When the flip - cover plate is flipped open, its back is used as a music score board. The metal keyboard frame integrating black - and - white piano keys, swing iron pieces, and a combined seat plate has a cross - section in the shape of a supine "ji" character. The whole keyboard frame forms two long grooves with the opening upward and the opening downward. The long groove with the opening upward is located below the playing area of the piano keys and is provided with the heavy - hammer end of the swing iron piece counterweight arm. The space of the long groove with the opening downward is located below the root area of the piano keys. The long groove is divided into three parts: left and right speaker chambers and a circuit PCB board installation chamber in the middle part by inner and outer baffles.

2. The structure of a flat-top electric piano according to claim 1, characterized in that: The inner and outer metal baffles that divide the long groove with the opening downward into left and right speaker chambers and a circuit PCB board installation chamber are in the shape of square covers. There are screw holes on the vertical folded edges around the plane. They are connected to the three sides of the long groove with the opening downward of the keyboard frame and the bottom - plate plane, and the gaps are sealed with sealing materials.

3. The structure of a table-type flat-top electric piano according to claim 1 is characterized in that: At the speaker parts at both ends of the long groove with the opening downward of the metal keyboard frame, there are no other air leakage holes except the screw holes used to connect the baffles and the bottom plate.

4. The structure of a table-type flat-top electric piano according to claim 1, characterized in that: the keyboard The circuit PCB board in the middle part of the long groove with the opening downward of the frame is inverted and suspended under the keyboard frame and is connected by screws.

5. The structure of a table-type flat-top electric piano according to claim 1 is characterized in that: The bottom plate of the keyboard case has a notch corresponding to the position of the circuit PCB board installation chamber in the middle part of the long groove with the opening downward of the keyboard frame.

6. The structure of a flat-top electric piano according to claim 1, characterized in that: The notch on the bottom plate of the keyboard case is closed by connecting the bottom cabin plate with screws.

7. The structure of a table-type flat-top electric piano according to claim 1 is characterized in that: the keyboard The left and right ends of the long groove with the opening downward of the frame and the bottom plate form speakers. There are openings on the inner bottom plate of the speakers. The speaker seat plate under the bottom plate corresponding to the hole positions is connected to the bottom plate by screws, and mid - bass speakers are installed on the speaker seat plate.

8. The structure of a flat-top electric piano according to claim 1, characterized in that: At the rear part of the key - pressing plate above the black - and - white piano keys, there is an inclined plane that forms an acute angle with the horizontal plane. When the flip - cover plate is flipped open, the back of the flip - cover plate, which was vertical when closed, abuts against the inclined plane of the key - pressing plate after being flipped open.

9. The structure of a flat-top electric piano according to claim 1, characterized in that: The width of the whole flip - cover plate is 200 to 250 millimeters.

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