MIDI synthesizer

Abstract

The utility model provides an MIDI synthesizer comprising a first circuit board and a silica gel button assembly, and the front surface of the first circuit board is provided with a plurality of touch switches; the silica gel key assembly comprises a key supporting plate and a plurality of silica gel keys; wherein the key supporting plate is provided with a plurality of key installation positions, the silica gel key comprises a silica gel key cap and at least one auxiliary supporting column, the cap body part of the silica gel key cap protrudes out of the key supporting plate, the cap edge part of the silica gel key cap extends into the corresponding key installation position, and a containing space is defined by the silica gel key cap and the key supporting plate; the touch switch and the auxiliary supporting column are located in the storage space, one end of the auxiliary supporting column is connected with the cap body part of the silica gel key cap, and a distance is kept between the other end of the auxiliary supporting column and the first circuit board; the silica gel button is provided with the auxiliary supporting column, the auxiliary supporting column can avoid the problem that the silica gel button sinks due to the fact that a user presses the edge corner of the silica gel button by mistake, and the use experience of the user is improved.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the technical field of electronic musical instrument, more specifically, relate to a MIDI synthesizer. BACKGROUND

[0002] With the development of science and technology and the popularity of MIDI (Musical Instrument Digital Interface) digital musical instrument, MIDI synthesizer has become one of the main input devices in modern music creation. Its advantages of creating high efficiency, convenient editing, convenient teaching, convenient arrangement, convenient performance and rich music gradually increase in market demand, and with the increase of user groups, MIDI synthesizer also develops in the direction of lightness, more professional and powerful functions, and convenient operation. At present, the MIDI synthesizer adopts the silicone key with the tact switch, and the pressing is not ideal. UTILIT Y MODEL CONTENT

[0003] The utility model aims at providing a kind of MIDI synthesizer, to solve the problem that if pressing stress is not stressed to the tact switch in the prior art, silicone key is extremely easy to sink, to cause pressing failure, and bring bad experience to user.

[0004] To achieve the above object, the utility model adopts the technical scheme that:

[0005] The utility model provides a kind of MIDI synthesizer, comprising:

[0006] First circuit board, the front of first circuit board is provided with multiple tact switches;

[0007] Silicone key assembly, silicone key assembly includes key support plate and multiple silicone keys, multiple silicone keys and multiple tact switches one to one;

[0008] Wherein, key support plate is opened with multiple key installation sites, silicone key includes silicone key cap and at least one auxiliary support column, the cap body portion of silicone key cap is projected to key support plate, the cap edge portion of silicone key cap is stretched into corresponding key installation site and is surrounded with key support plate to form storage space, tact switch and auxiliary support column are located in storage space, one end of auxiliary support column is connected with the cap body portion of silicone key cap, the other end of auxiliary support column and first circuit board keep distance.

[0009] Further, the front of first circuit board is provided with multiple light emitting modules, light emitting module includes at least one light emitting unit adjacent to corresponding tact switch.

[0010] Further, the tactile switch comprises a cuboid base and a press handle which is arranged on the base in a liftable manner, and the light-emitting module comprises two light-emitting units which are arranged on both sides of the tactile switch along the length or width direction of the base.

[0011] Further, the silica gel button further comprises at least one light guide column, one end of the light guide column is connected with the cap body part of the silica gel button cap, and the other end of the light guide column is kept at a distance from the corresponding light-emitting unit.

[0012] Further, the silica gel button comprises two or four auxiliary support columns.

[0013] Further, the MIDI synthesizer further comprises a shell with a containing cavity and a screen assembly which is clamped on the shell, and part of the silica gel button assembly and the first circuit board are located in the containing cavity.

[0014] Further, the shell comprises a face shell and a bottom shell which are detachably connected and enclose the containing cavity, and the screen assembly is clamped on the face shell.

[0015] Further, the screen assembly comprises a face cover, a front foam pad, a screen, a back foam pad and a fixed cover plate which are arranged in sequence, the fixed cover plate is provided with a plurality of positioning holes, and the face shell is provided with buckles which are clamped in one-to-one correspondence with the plurality of positioning holes.

[0016] Further, the MIDI synthesizer further comprises a second circuit board, a striking pad and a carbon film sheet arranged between the second circuit board and the striking pad, the striking pad comprises a pad support plate and a plurality of silica gel pads, the second circuit board is provided with a plurality of gold fingers which are in one-to-one correspondence with the plurality of silica gel pads, and the carbon film contact surface of the silica gel pad facing the carbon film sheet has an arc surface which is curved away from the carbon film sheet.

[0017] Further, the gold finger adopts a "turbine straight line type" structure or a "turbine arc type" structure.

[0018] Compared with the prior art, the MIDI synthesizer provided by the utility model has at least one of the following beneficial effects:

[0019] 1. The silica gel button is provided with auxiliary support columns, which can avoid the problem that the silica gel button is depressed due to the user pressing the edge of the silica gel button by mistake, and improve the user experience.

[0020] 2. The silica gel button is provided with light guide columns, which can make the light source more uniform in the case of insufficient key wall thickness by increasing the distance.

[0021] 3. The front foam pad is arranged above the screen, which can prevent the screen from being damaged when the product falls and is subjected to a frontal impact, and the screen assembly is clamped and fixed by the positioning holes and the buckles, which not only reduces the use of materials, but also improves the production and assembly efficiency.

[0022] 4. Adopt large size strike pad, at the same time, set slight arc surface on the carbon film contact surface of silica gel pad, and the gold finger adopts "turbine linear type" structure, improve sensitivity. BRIEF DESCRIPTION OF DRAWINGS

[0023] In order to more clearly illustrate the technical scheme in the embodiments of the present application, the drawings needed to be used in the embodiments or prior art description will be briefly introduced as follows. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor.

[0024] Figure 1 It is a structure schematic view of the silica gel key assembly in the present application;

[0025] Figure 2 It is a cross-sectional view schematic diagram of the silica gel key assembly and the first circuit board after assembly in the present application;

[0026] Figure 3 It is a specification parameter schematic diagram of the tactile switch in the present application;

[0027] Figure 4 It is a layout of the tactile switch and the light emitting module in the present application;

[0028] Figure 5 It is a layout of the tactile switch and the light emitting module in the present application;

[0029] Figure 6 It is an exploded structure schematic diagram of the screen assembly and the face shell clamping in the present application;

[0030] Figure 7 It is an assembly structure schematic diagram of the screen assembly and the face shell clamping in the present application;

[0031] Figure 8 It is a structure schematic diagram of the strike pad in the present application;

[0032] Figure 9 It is a cross-sectional view schematic diagram of the strike pad in the present application;

[0033] Figure 10 It is Figure 9 It is an enlarged schematic diagram of A in the present application;

[0034] Figure 11 It is a cross-sectional view schematic diagram of the strike pad, the carbon film and the second circuit board after assembly in the present application;

[0035] Figure 12 It is a structure schematic diagram when the gold finger adopts "turbine arc type" structure in the present application;

[0036] Figure 13 The structure diagram is used for the "turbine linear type" style structure of the gold finger in the utility model;

[0037] Figure 14 The overall exploded structure diagram of the MIDI synthesizer in the utility model;

[0038] In the drawings, the main marks are as follows:

[0039] 1, first circuit board; 2, light touch switch; 3, silica gel button assembly; 4, light emitting unit; 7, second circuit board; 8, striking pad; 9, carbon film; 10, knob; 11, pusher; 12, silica gel direction button; 13, mainboard fixing screw; 14, shell fixing screw; 15, toggle switch; 16, silica gel foot pad; 17, function button assembly;

[0040] 21, base; 22, pressing handle; 31, button support plate; 32, silica gel button; 321, silica gel button cap; 322, auxiliary support column; 323, light guide column; 51, face shell; 511, buckle; 52, bottom shell; 61, face cover; 62, front foam pad; 63, screen; 64, back foam pad; 65, fixed cover plate; 651, positioning hole; 81, pad support plate; 82, silica gel pad; 83, exhaust groove; 84, arc surface. DETAILED DESCRIPTION

[0041] In order to make the technical problems, technical solutions and beneficial effects of the utility model clearer and more apparent, the utility model will be further described in detail below in combination with the drawings and examples. It should be understood that the specific examples described herein are only used to explain the utility model and do not limit the utility model.

[0042] With the increase of user groups, the MIDI synthesizer also develops in the direction of being light, more professional and powerful in function, easy to use and operate, etc. The utility model is mainly born to solve the above three new demand directions of the MIDI synthesizer. With the increase of new demands of the MIDI synthesizer, the MIDI synthesizer structure is particularly important for man-machine interaction, operation and friendly experience. However, the inventor found that the current MIDI synthesizer has the following problems: ① The current silica gel button with light touch switch pressing and RGB lamp display are not ideal; ② The current MIDI synthesizer man-machine interaction screen assembly method is complex and cannot resist falling; ③ The current large size striking pad is easy to break or has poor sensitivity. Based on the foregoing problems, the utility model provides a professional, powerful and easy-to-operate MIDI synthesizer.

[0043] Firstly, the inventor found through research that the reasons for the unsatisfactory light touch switch pressing and RGB light display effects of the silica gel button are as follows, which are also the core reasons why the industry is reluctant to adopt the light touch switch silica gel button and light display integrated design: ① The light touch switch pressing handle of the industry button is relatively small, usually with a diameter of 2mm; ② The silica gel is relatively soft and has elastic deformation when pressed. If the pressing force is not applied to the light touch switch, the silica gel button is prone to sink, resulting in pressing failure and poor user experience. If the silica gel button size is designed to be very small, although it can meet the pressing force acting on the light touch switch, the user group is not the same, such as users with large fingers, and the small size button also brings an unfriendly experience to users. At the same time, the characters on the surface of the button are usually engraved and transparent, and the small characters cannot display the function prompts. According to market research, the best mainstream button size or diameter is about 13mm. ③ Light touch switch and RGB / LED selection and arrangement problems. It can be understood that the light touch switch is placed in the center position, and its stress and pressing effect is the most ideal position, and the same is true for light display. In order to balance the needs of both, the light touch switch / RGB lamp selection is very important, and the structure design and arrangement are also very important.

[0044] For this purpose, see Figure 1 、 Figure 2 The MIDI synthesizer provided by the utility model comprises:

[0045] A first circuit board 1, the front surface of the first circuit board 1 is provided with a plurality of light touch switches 2;

[0046] A silica gel button assembly 3, the silica gel button assembly 3 comprises a button support plate 31 and a plurality of silica gel buttons 32, and the plurality of silica gel buttons 32 correspond to the plurality of light touch switches 2 one by one;

[0047] Among them, the button support plate 31 is provided with a plurality of button mounting positions, the silica gel button 32 comprises a silica gel button cap 321 and at least one auxiliary support column 322, the cap body part of the silica gel button cap 321 protrudes from the button support plate 31, the cap edge part of the silica gel button cap 321 extends into the corresponding button mounting position and surrounds the accommodation space together with the button support plate 31, the light touch switch 2 and the auxiliary support column 322 are located in the accommodation space, one end of the auxiliary support column 322 is connected with the cap body part of the silica gel button cap 321, and the other end of the auxiliary support column 322 is kept at a distance from the first circuit board 1.

[0048] Preferably, a gap height of 0.6-0.8mm is reserved between the auxiliary support column 322 and the first circuit board 1. The number of auxiliary support columns 322 can be set to two or four, and of course the number of auxiliary support columns 322 can be set according to the size of the silica gel button 32.

[0049] The utility model discloses a silica gel button 32 is provided with auxiliary support column 322, and auxiliary support column 322 can avoid the problem that the user presses the edge angle of silica gel button 32 and causes silica gel button 32 to sink, improves the user's use experience.

[0050] Further, the front surface of the first circuit board 1 is provided with a plurality of light emitting modules, and each light emitting module comprises at least one light emitting unit 4 arranged adjacent to a corresponding tactile switch 2. Figure 3 As shown in the drawings, the tactile switch 2 comprises a cuboid-shaped base 21 and a press handle 22 arranged on the base 21 in a liftable manner.

[0051] Preferably, in the selection of the tactile switch 2, a general-purpose tactile switch 2 (HYS-133, specification parameters as shown in the drawings) with a small size and a large press handle 22 is selected, which satisfies the relative maximum contact force area within the optimal size range of the silica gel button 32. Figure 3 The light emitting unit 4 adopts an RGB lamp or an LED lamp, and the RGB / LED lamp also has the same principle (the size specification is not described here), and in principle, the size is selected as small as possible to facilitate subsequent arrangement and layout under the condition of meeting the lighting requirements.

[0052] The arrangement and layout can be adjusted and expanded according to different shapes and sizes, and the following are two preferable arrangement schemes.

[0053] As shown in the drawings, the light emitting module is composed of one light emitting unit 4, and the light emitting unit 4 adopts an RGB lamp or an LED lamp. Figures 1 to 4 This arrangement scheme is suitable for the arrangement and layout of the silica gel button 32 in the form of a square or a nearly square.

[0054] As shown in the drawings, Figures 1 to 3 , Figure 5 the light emitting module is composed of two light emitting units 4, and the light emitting unit 4 adopts an RGB lamp or an LED lamp. Figure 5 In the drawings, two light emitting units 4 are distributed on both sides of the tactile switch 2 along the width direction of the base 21 in the tactile switch 2. This arrangement scheme is suitable for the arrangement and layout of the silica gel button 32 in the form of a rectangle.

[0055] Further, as shown in the drawings, Figure 1 , Figure 2 the silica gel button 32 further comprises at least one light guide column 323, one end of the light guide column 323 is connected with the cap body part of the silica gel button cap 321, and the other end of the light guide column 323 is kept at a distance from the corresponding light emitting unit 4.

[0056] The utility model discloses a silica gel button 32 is provided with light guide column 323, and light guide column 323 can be more ideal in the light source even light effect through increasing distance under the condition of the insufficient wall thickness of button, of course, also can improve through adjusting silica gel transparency.

[0057] Through the above-mentioned series of improvement schemes, the phenomenon of the silica gel button 32 with the tact switch 2 pressing subsidence and the RGB / LED lamp even light display effect is not ideal is perfectly solved.

[0058] Secondly, the inventor found that the professional version MIDI synthesizer usually has more knobs / pushers and other function buttons, and these function features mean that a screen is needed to facilitate human-computer interaction. It is difficult to assemble an integrated module, so module splitting is a necessary choice. The OLED screen fixing mode in the industry is one of the splitting methods, and currently, OLED+EVA+screen fixing cover plate+screw fixing is usually selected. This assembly method has the following two defects: ① There is a risk of damaging the screen when the product falls vertically; ② The efficiency and cost of screw fixing can be optimized and improved.

[0059] To this end, the MIDI synthesizer provided by the utility model further includes a housing with a containing cavity and a screen assembly detachably connected to the housing and located in the containing cavity.

[0060] Preferably, as shown in Figure 6 、 Figure 7 、 Figure 14 The housing includes a face shell 51 and a bottom shell 52 that are detachably connected and enclose the containing cavity, and the screen assembly is detachably connected to the face shell 51. The screen assembly includes a face cover 61, a front foam pad 62, a screen 63, a back foam pad 64, and a fixing cover plate 65 that are sequentially stacked, and the fixing cover plate 65 is provided with a plurality of positioning holes 651, and the face shell 51 is provided with a plurality of buckles 511 that are detachably connected to the plurality of positioning holes 651. The front foam pad 62 and the back foam pad 64 can be EVA foam pads, and the screen 63 can be an OLED screen.

[0061] The utility model adds the front foam pad 62 directly above the screen 63, which ensures that the screen 63 will not be damaged when the product falls vertically from a height of 1.2 m. At the same time, the screen assembly is fixed without screws, and the positioning holes 651 and the buckles 511 are detachably connected, which not only reduces the use of materials, but also improves the production and assembly efficiency.

[0062] In addition, the inventor has found through research that the industry generally uses less large-size striking pads (a large-size striking pad refers to a striking pad with a length and width of more than 30 mm), and the reasons are mainly as follows: ① A large-size striking pad means that the striking pad itself is larger in size, and the bottom end associated side wall needs to be small enough (usually 0.2 mm), which is difficult for hot-press forming manufacturing. On the one hand, it is difficult to ensure the uniformity of the pressure (the uniformity of the effective wall thickness) in many striking pads; on the other hand, it is also difficult to ensure the uniformity of the hot-press forming temperature (to effectively ensure the stability of the overall forming). Therefore, the manufacturing die arrangement is usually recommended to be 1*1. ② The large-size striking pad is heavier, and is more likely to be triggered on a constant unit area, that is, it is more likely to be accidentally triggered. On the one hand, in order to reduce the triggering force, that is, the pressure of the carbon film sheet triggered by deformation, it is necessary to increase the contact force area, and on the other hand, the stability of the striking pad itself also needs to increase the contact force area. Usually, the carbon film sheet is composed of a substrate + silk screen conductive layer (0.04 mm) + silk screen support layer (0.1 mm), and there is an RGB lamp avoidance hole in the middle. On the one hand, increasing the area is also relatively limited, and the larger the area, the more likely the middle region is to come into contact with the PCBA gold finger, which also easily leads to triggering. On the other hand, increasing the contact area means that the knocking force is also increased in a proportional linear manner. Therefore, when designing, it is necessary to find a balance point on the basis of the foregoing contradictions to improve the experience of user operation unfriendliness. ③ The design of the large-size silicone striking pad, the carbon film sheet, and the gold finger also needs to take into account the exhaust. Usually, silicone and carbon film are relatively flexible materials, and the knocking process is actually an exhaust and air absorption process. A large size means that this cycle is slower than a small size, and is not friendly to high-frequency knocking.

[0063] To this end, as shown in Figures 8 to 13 The MIDI synthesizer provided by the utility model further includes a second circuit board 7, a striking pad 8, and a carbon film sheet 9 arranged between the second circuit board 7 and the striking pad 8. The striking pad 8 includes a pad support plate 81 and a plurality of silicone pad blocks 82. The pad support plate 81 is provided with a plurality of pad mounting positions and a plurality of exhaust grooves 83 arranged around the pad mounting positions. The silicone pad blocks 82 are fixed at the corresponding pad mounting positions. The striking contact surface of the silicone pad blocks 82, which faces away from the carbon film sheet 9, protrudes from the pad support plate 81. The carbon film contact surface of the silicone pad blocks 82, which faces the carbon film sheet 9, has an arc surface 84 (as shown in Figure 9 、 Figure 10 ) that curves away from the carbon film sheet 9. The second circuit board 7 is provided with a plurality of gold fingers corresponding to the plurality of silicone pad blocks 82. The gold fingers adopt a "turbine straight line type" structure (as shown in Figure 12 ) or a "turbine arc type" structure (as shown in Figure 13 ).

[0064] The utility model discloses a design of the beating pad 8 adopts slightly cambered surface 84 on the basis of guaranteeing reasonable design K value on the carbon film contact surface of silica gel pad block 82, this not only improves the exhaust, also helps its and carbon film piece 9 flexible close contact. Also consider that the knock trigger force and area change process are similar to water ripple transmission, and the beating pad 8 of big size is designed to guarantee that the contact area between silica gel pad block 82 and carbon film piece 9 is reduced as far as possible under the premise of not triggering in natural state, and the knock linear force is improved, and material self-recovery exhaust performance is also improved, effectively guarantee the friendly operation experience of big size beating pad 8. On this basis, the following innovations are made for the golden finger, such as Figure 12 As shown in FIG. 8, the golden finger adopts a "turbine linear type" style structure, as shown in FIG. 9, the golden finger adopts a "turbine arc type" style structure. It should be understood that when the golden finger adopts the "turbine linear type" style structure, the linear force intensity is satisfied, and the end face exhaust is also beneficial. It is found in the test process that the golden finger adopts the "turbine arc type" style structure than the "turbine linear type" style structure in the intensity of induction is more friendly, but the exhaust is slightly worse. But for small size beating pad 8 is a good choice, can do extension backup. Figure 13

[0065] In summary, the utility model solves the problem of the silica gel key 32 of the light touch switch 2 not triggering and the uneven light emission of the RGB lamp on the key, improves the production and assembly efficiency, and greatly improves the performance sensitivity of the large size beating pad 8. 45-60g can reach the trigger condition (industry conventional product is 120-150g).

[0066] For better understanding, the overall structure of the MIDI synthesizer provided by the utility model is introduced. As shown in FIG. 1, Figure 14 ​As shown, the MIDI synthesizer comprises a screen 63 for human-computer interaction adjustment display use, preferably an OLED screen; a face cover 61 for protecting the screen 63; a front foam pad 62 for front shock absorption and protection of the screen 63; a back foam pad 64 for back shock absorption and protection of the screen 63; a fixing cover plate 65 for fixing the screen 63; nine knobs 10, which are used as function adjustment knobs 10; four pushers 11, which are used as parameter adjustment pushers 11; a silica gel direction key 12, which is used as a menu parameter plus-minus adjustment of the screen 63; a silica gel key assembly 3, which can be regarded as a custom and initial allocation function key; a first circuit board 1, i.e. a PCBA mainboard, which is used as a signal collection input-output processing carrier of each function key and the strike pad 8; a function key assembly 17, which is used as a related function key; a strike pad 8, which can be regarded as a MIDI signal input strike pad 8; a carbon film 9, which is used as a strike pad 8 knocking trigger film; a second circuit board 7, i.e. a PCBA, which is used as a signal collection input-output processing carrier of the function key and the strike pad 8; a mainboard fixing screw 13, which is used as a PCBA mainboard / strike pad 8 fixing screw; a face shell 51, which is used as a fixed main body of each part of the product; a bottom shell 52, which is used as a strike pad 8 and circuit board support and whole product clamping fixing part; a shell fixing screw 14, which is used as a screw for fixing the face shell 51 and the bottom shell 52; a toggle switch 15, which is used as a power on-off switch; a silica gel foot pad 16, which is used as a support pad for preventing slipping and protecting the bottom shell 52 from scratching during product use.

[0067] The above merely describes the preferred embodiments of the present application and is not intended to limit the present application, and any modification, equivalent replacement and improvement within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A MIDI synthesizer, characterized in that, include: A first circuit board, wherein a plurality of tactile switches are provided on the front side of the first circuit board; A silicone button assembly, comprising a button support plate and multiple silicone buttons, wherein each of the multiple silicone buttons corresponds to a multiple of the tactile switches; The button support plate has multiple button mounting positions. The silicone button includes a silicone button cap and at least one auxiliary support post. The cap body of the silicone button cap protrudes from the button support plate, and the edge of the silicone button cap extends into the corresponding button mounting position and forms a storage space with the button support plate. The tactile switch and the auxiliary support post are located in the storage space. One end of the auxiliary support post is connected to the cap body of the silicone button cap, and the other end of the auxiliary support post is kept at a distance from the first circuit board.

2. The MIDI synthesizer as described in claim 1, characterized in that, The front side of the first circuit board is provided with multiple light-emitting modules, each light-emitting module including at least one light-emitting unit disposed adjacent to the corresponding tactile switch.

3. The MIDI synthesizer as described in claim 2, characterized in that, The tactile switch includes a rectangular base and a press handle that can be raised and lowered on the base. The light-emitting module includes two light-emitting units distributed on both sides of the tactile switch along the length or width of the base.

4. The MIDI synthesizer as described in claim 2 or 3, characterized in that, The silicone button also includes at least one light guide post, one end of which is connected to the cap portion of the silicone button cap, and the other end of which is kept at a distance from the corresponding light-emitting unit.

5. The MIDI synthesizer as described in claim 2 or 3, characterized in that, The silicone button includes two or four auxiliary support pillars.

6. The MIDI synthesizer as described in claim 1, characterized in that, The MIDI synthesizer also includes a housing with a receiving cavity and a screen assembly snapped onto the housing, with a portion of the silicone button assembly and the first circuit board located within the receiving cavity.

7. The MIDI synthesizer as described in claim 6, characterized in that, The housing includes a front shell and a bottom shell that are detachably connected and form the receiving cavity, and the screen assembly is snap-fitted to the front shell.

8. The MIDI synthesizer as described in claim 7, characterized in that, The screen assembly includes a front cover, a front foam pad, a screen, a back foam pad, and a fixing cover plate stacked in sequence. The fixing cover plate has multiple positioning holes, and the front cover is provided with buckles that correspond to and engage with the multiple positioning holes one by one.

9. The MIDI synthesizer as described in claim 1, characterized in that, The MIDI synthesizer also includes a second circuit board, a drum pad, and a carbon film disposed between the second circuit board and the drum pad. The drum pad includes a pad support plate and a plurality of silicone pads. The second circuit board is provided with a plurality of gold fingers corresponding one-to-one with the plurality of silicone pads. The carbon film contact surface of the silicone pad facing the carbon film has an arc surface that bends away from the carbon film.

10. The MIDI synthesizer as described in claim 9, characterized in that, The gold fingers adopt a "turbine linear" or "turbine arc" structure.

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