CN103700364B - A kind of photoelectric keyboard device for performance of improvement - Google Patents
A kind of photoelectric keyboard device for performance of improvement Download PDFInfo
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- CN103700364B CN103700364B CN201310681689.4A CN201310681689A CN103700364B CN 103700364 B CN103700364 B CN 103700364B CN 201310681689 A CN201310681689 A CN 201310681689A CN 103700364 B CN103700364 B CN 103700364B
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Abstract
The present invention relates to musical instrument field, the specifically photoelectric keyboard device for performance of a kind of improvement, including key, front shelves, front shelves enclose, white-black key and alignment pin, middle-grade, middle-grade circle, middle-grade pin, rear shelves, rear shelves bar, pressure key pin, balancing weight, light blocking sheet, banking pin, buffering felt, printed circuit board (PCB) and power supply, infrared-emitting diode, infrared receiving diode and mould shell, by key, front shelves, white-black key and alignment pin, middle-grade, middle-grade round pin, pressure key lever and support, the keyboard that rear shelves and balancing weight form with circuit board, the middle-grade right flank of keyboard is provided with elastic adhesive tape to the one side of front shelves, adhesive tape shape is approximately L-shaped, L-shaped top is slightly shorter while pressing close to the bottom surface of key middle position, it is provided with light blocking sheet near the bottom surface, key left part position of rear shelves.The present invention compared with the existing technology, has an advantage in that: using the infrared emission photoelectric coupling circuit to two infrared receiver, dynamics reaction equilibrium, cost is relatively low, and assembling is easily.
Description
[technical field]
The present invention relates to musical instrument field, the photoelectric keyboard device for performance of a kind of improvement.
[background technology]
Traditional mechanical piano keyboard is lever keyboard, due to its simple in construction, is easy to maintenance, and plays sense of touch and fit
The feature such as preferably is used widely, but traditional mechanical piano price for average family is the most expensive, and easily by performance ring
Border, the restriction in place, along with the progress of science and technology, electronic organ is born and gradually develops, and the various functions of electronic organ is also gradually improved.
Owing to piano key has strength characteristics, so tradition piano simulated by present most of electronic organ and pianotron
This dynamics effect, principle is: by the time difference of constant point-to-point transmission in detection key motion, can try to achieve acceleration and dynamics,
And then control the volume power effect of source of sound.The dynamics testing circuit great majority that key is conventional at present are contact, and only a few is used
Contactless.
The Dynamics keyboard of the most most electronic organs and pianotron uses conducting resinl method.Contact conducting resinl method
Advantage is that circuit is simple, and low cost manufactures assembling easily；Shortcoming be key and conducting resinl, conducting resinl again with circuit board contacts grid
Contact process produces resistance, makes conducting resinl that key to be played feel and produce impact, manufacture and rigging error easily causes the time
The error at interval, conducting resinl also easy senile abrasion and elastic fatigue, conducting resinl contact is easy with the resistance value of circuit board contacts grid
Affected by environment epidemic disaster.
Minority electrons piano uses the lever wooden keyboard of traditional mechanical piano, i.e. middle-grade as balance pivot with keyboard, and one
End plays end for finger, and the other end is the lever Balance weight end that feel is played in regulation, replaces traditional mechanical piano with balancing weight
Hammered string instrument structure, this pianotron simplifies structure, reduces cost, but when typically playing electronic piano keyboard, simple thick stick
Bar sinks to feeling hollow, it is difficult to jacking sensation slight during hammered string instrument structure disconnection when traditional mechanical piano is played in simulation.
The Chinese patent of Patent No. 201010023166.7 discloses the electrooptical device of a kind of strength keyboard of musical instrument, this dress
Put the detection keyboard instrument key action being to form with infrared light dual control photosensitive receiving tube and infrared-emitting diode and play power
The circuit arrangement of degree, it is good that this detection device does not affect the feel of playing of key, reliability and concordance, is quick on the draw, but due to
Infrared light dual control photosensitive receiving tube needs customization, rather than universal component is readily available, and cost is the highest.
[summary of the invention]
It is the best that the contact conducting resinl method in improvement prior art that it is an object of the invention to plays feel, and conducting resinl is also the oldest
Change abrasion and the shortcoming of elastic fatigue, and the electrooptical device of strength keyboard of musical instrument uses infrared light dual control photosensitive receiving tube cost too
Height, material is difficult to the problem obtained, it is provided that a kind of simple in construction, low cost, and reliability and concordance are good, plays feel and improves,
Material easily obtains, the photoelectric keyboard device for performance of improvement easy to assembly.
To achieve these goals, it is provided that a kind of improvement for play photoelectric keyboard device, including key, front shelves,
Front shelves circle, white-black key and alignment pin, circle middle-grade, middle-grade, middle-grade pin, banking pin, buffering felt, rear shelves, rear shelves bar, pressure key
Pin, balancing weight, light blocking sheet, printed circuit board (PCB) and power supply, infrared-emitting diode, infrared receiving diode and mould shell, by qin
Key, front shelves, white-black key and alignment pin, round pin middle-grade, middle-grade, pressure key lever and support, rear shelves and balancing weight and printed circuit board (PCB)
The keyboard of composition, the middle-grade right flank of keyboard is provided with elastic adhesive tape to the one side of front shelves, and adhesive tape shape is approximately L-shaped, and L-shaped top is slightly
Short while pressing close to the bottom surface of key middle position, it is provided with light blocking sheet, below light blocking sheet near the bottom surface, key left part position of rear shelves
Being provided with the printed circuit board (PCB) of correspondence, each light blocking sheet can isolate infrared emission two pole of correspondence position on printed circuit board (PCB)
The infra-red radiation of one group of optocoupler of pipe and two infrared receiving diode compositions.
The arm of force of the Balance weight end of all keys on the keyboard of above-mentioned photoelectric keyboard device is identical, and middle-grade round pin is with all
The middle-grade connection that key is corresponding, the surrounding stickup buffering felt of pressure key lever is with shockproof noise reduction, and pressure key pin is against middle-grade round pin
Being lying on all keys with banking pin, pressure key lever two ends are inserted in the hole that keyboard case both sides are corresponding, at pressure key lever
It is arranged above with support.
Each key of the keyboard of above-mentioned photoelectric keyboard device, corresponding one group by an infrared-emitting diode and two
The optocoupler unit of relative infrared receiving diode composition, by the most corresponding ranks relation electrical connection, structure between each unit
Become the matrix-scanning circuit of whole strength keyboard of musical instrument.
Also have a kind of improvement for play photoelectric keyboard device, including key, front shelves, front shelves circle, white-black key and
Alignment pin, circle middle-grade, middle-grade, middle-grade pin, buffering felt, rear shelves, rear shelves bar, pressure key pin, balancing weight, light blocking sheet, printing
Circuit board and power supply, infrared-emitting diode, infrared receiving diode and mould shell, by key, front shelves, white-black key and alignment pin,
The keyboard that round pin middle-grade, middle-grade, pressure key lever and support, rear shelves and balancing weight form with printed circuit board (PCB), the middle-grade right side of keyboard
In the face of the one side of front shelves is provided with elastic adhesive tape, adhesive tape shape is approximately L-shaped, L-shaped top slightly shorter press close to key middle position
Bottom surface, be provided with light blocking sheet near the key right station bottom surface of front shelves, be provided with the printed circuit board (PCB) of correspondence below light blocking sheet, often
Individual light blocking sheet can isolate an infrared-emitting diode of correspondence position on printed circuit board (PCB) and two infrared receiving diodes
The infra-red radiation of the one group of optocoupler constituted.
On the keyboard of the keyboard of above-mentioned another kind of photoelectric keyboard device, the arm of force of the Balance weight end of all keys is identical, middle-grade
Round pin and all keys middle-grade are connected with corresponding, and pressure key lever is pressed in the over top of middle-grade round pin, pressure key lever and in
Pasting buffering felt isolation between shelves round pin, pressure key lever two ends folding an angle of 90 degrees is screwed in the both sides of keyboard case, presses key lever
Top is provided with support, also pastes buffering felt isolation between pressure key lever and support.
Each key of the keyboard of above-mentioned another kind of photoelectric keyboard device, corresponding one group by an infrared-emitting diode
The optocoupler unit that the infrared receiving diode relative with two, two audions form, bearing of described infrared receiving diode
Pole connecting triode composition reverse swing door circuit, by the most corresponding ranks relation electrical connection between each unit, constitutes whole pleasure
The matrix-scanning circuit of device Dynamics keyboard.
Described elastic adhesive tape is L-shaped, thickness 3～4 millimeters, and the length of side 10 that L-shaped is slightly shorter～15 millimeters are pressed close at the bottom of key
Face, another length of side 28 that L-shaped is slightly long～30 millimeters are connected to the middle-grade one side towards front shelves of keyboard.
The light blocking sheet being located at key bottom surface is square, and the one side that light blocking sheet is connected with key bottom surface is provided with a protrusion
Body, the correspondence position that key bottom surface is connected with light blocking sheet is provided with a shrinkage pool, and the bossy body of light blocking sheet embeds the recessed of key bottom surface
Interworking location in hole, light blocking sheet is additionally provided with a through hole, connects for the hole screw that draws with key bottom surface.
One group of optocoupler unit on the printed circuit board (PCB) that described light blocking sheet is corresponding, by an infrared-emitting diode and two
Individual relative infrared receiving diode composition, two infrared receiving diodes are in juxtaposition, and both rise general difference about 1
Millimeter, relative infrared-emitting diode is corresponding to the middle part of two infrared receiving diodes arranged side by side, infrared-emitting diode
Rise the centre risen between two relative infrared receiving diodes.
Every 12 of described infrared-emitting diode is a combination, is located at a complete transmitting tube and moulds in shell, spacing with
Corresponding with one group of key axle center spacing that 5 black keys form consistent by continuous 7 white key, infrared light emission direction is identical.
Every 24 of described infrared receiving diode is a combination, is located at a complete reception pipe and moulds in shell, every two
Infrared receiving diode is listed as a unit, each unit spacing and the one group of key being made up of continuous 7 white key and 5 black keys
Axle center spacing is corresponding consistent, and infrared light receives towards identical, and two infrared receiving diode height of each unit are straggly unanimously,
Between whole piece the most straggly.
The present invention compared with the existing technology, has an advantage in that: use the infrared emission photoelectricity to two infrared receiver
Coupling circuit, novel in design, dynamics reaction equilibrium, improve reliability, cost is relatively low, economical and practical, and material easily obtains, work
Skill is easy, and assembling is easily；Instead of original conducting resinl with elastic adhesive tape, effectively improve the touching sense that key is played, key
Dish sense of touch is more true to nature, and qin body counterweight alleviates, and service life is longer, reduces cost.
[accompanying drawing explanation]
Fig. 1 is infrared ray optocoupler unit section figure of the present invention；
Fig. 2 is infrared ray optocoupler unit of the present invention and light blocking sheet schematic diagram；
Fig. 3 is infrared-emitting diode combined plastic shell front view of the present invention；
Fig. 4 is infrared-emitting diode combined plastic shell top view of the present invention；
Fig. 5 is infrared receiving diode combined plastic shell front view of the present invention；
Fig. 6 is infrared receiving diode combined plastic shell top view of the present invention；
Fig. 7 is scanning circuit mounting structure figure a of the present invention；
Fig. 8 is Dynamics keyboard matrix-scanning circuit theory diagrams a of the present invention；
Fig. 9 is scanning circuit mounting structure figure b of the present invention；
Figure 10 is Dynamics keyboard matrix-scanning circuit theory diagrams b of the present invention；
Figure 11 is the side view a of pianotron structure of the present invention；
Figure 12 is the side view b of pianotron structure of the present invention；
In figure: 1. before infrared-emitting diode 2. infrared receiving diode 3. infrared receiving diode 4. light blocking sheet 5.
The shelves middle-grade 9. middle-grade round pins of elastic adhesive tape 10. 11. of 6. white key alignment pin 7. black key alignment pins 8. buffer felt 12. and press key
Shelves 14. key 15. white key 16. black key 17. balancing weight 18. support 19. banking pin 20. circuit board after lever 13.
111. infrared-emitting diode combined plastic shell 222. infrared receiving diode combined plastic shell 40. through holes 41. protrude cylinder；
Specify Fig. 7 as the Figure of abstract of the present invention.
[detailed description of the invention]
The invention will be further described below in conjunction with the accompanying drawings, and the structure of this device and principle are for the people of this specialty
It is the most clearly.Should be appreciated that specific embodiment described herein, only in order to explain the present invention, is not used to limit this
Invention.
Embodiment 1
The technical solution used in the present invention is as follows: before pin in traditional lever type mechanical fingerboard black key and white key
Rear structure alternately is transformed, and in the black key that displacement keyboard is middle-grade, pins position puts the middle pin-and-hole position with black key, when making side-looking keyboard
Black key, the middle pin of white key are in middle-grade same projected position；The ageing-resistant elastic silica gel of L-shaped by section thickness about 3～4 millimeters
Bar, is located at the middle-grade one side towards front shelves of keyboard, and silica gel strip another side cross-sectional length is about 10～12 millimeters, presses close at the bottom of key
Face, when playing key, key bottom surface pressing silica gel strip, after adding this elastic adhesive tape, when playing, the fulcrum of key is advanced, and counterweight subtracts
Gently.Button starting stage keyboard is middle-grade for fulcrum, and by key bottom surface and elastic adhesive tape contact phase, elastic adhesive tape is fulcrum,
Moment by weak enhancing, the strong and weak change of keystroke dynamics during this process simulation piano playing.
Arranging pressure key lever at pin being positioned in above key, this lever wraps up shockproof buffer material also with at keypad contact
It is lying on keyboard, and presses and above key lever, be additionally provided with support, to stop that pressure key lever and key upwards bounce.
In the above-mentioned fender scheme that can be applicable to traditional mechanical fingerboard and lever keyboard, such as keyboard scanning circuit
For reflection-type optocoupler sensing device, individual devices is integrated with transmitting and receive capabilities, rely on key bottom surface to ultrared reflection,
The action of detection key and dynamics, it is not necessary to block ultrared light blocking sheet.But owing to reflection-type transmitting semi-conducting material power is little,
Easily decay is aging, degree of influence accuracy of detection, and optocoupler with key close-packed arrays without isolation, easily interfere, therefore use
Advantage of lower cost, circuit is simple, reliable and stable new infrared light correlation scheme.
Fig. 1 mid-infrared emitting diode combined plastic shell 111 includes infrared-emitting diode 1, and infrared receiving diode combines
Moulding shell 222 and include infrared receiving diode 2 and infrared receiving diode 3, infrared receiving diode 3 position is higher than infrared receiver two
Pole pipe 2, usual difference in height is about 1 millimeter away from value, and the height of Fig. 1 mid-infrared emitting diode 1 is between infrared receiver two
In the middle of pole pipe 2 and infrared receiving diode 3；Fig. 2 illustrates the infrared receiving diode 2 of each unit and infrared receiving diode 3
Being in juxtaposition, interface overlaps with the centre section of infrared-emitting diode 1, the infrared-emitting diode in the most each unit
1 two infrared receiving diodes 2 simultaneously going up bottom right (or being set to lower-left upper right) to the left and infrared receiving diode 3 are launched infrared
Light, light blocking sheet 4 is the black engineering plastics of blocks infrared radiation, or is metal material, and blocking surface width connects slightly larger than infrared
Receive diode 2 width 1.5 times, height is slightly larger than the height of infrared receiving diode combined plastic shell 222, light blocking sheet 4 another side
It is provided with through hole 40 and protrudes cylinder 41.
As shown in Figure 3 and Figure 4, that combines 12 infrared-emitting diodes 1 moulds shell bar 111, each infrared-emitting diode
Inserting from top moulds shell acupuncture point, each acupuncture point center distance and continuous 7 white key of keyboard and one group of key axle of 5 black key compositions
Consistent away from correspondence in the heart.
As shown in Figure 5 and Figure 6, that combines 24 infrared receiving diodes 2 and 3 moulds shell bar 222, every two infrared receiver two
Pole pipe inserts from top for a pair side by side to be moulded shell acupuncture point, and after being inserted into bottom acupuncture point, height is straggly, each acupuncture point center distance and keyboard
Continuous 7 white key are corresponding with one group of key axle center spacing that 5 black keys form consistent, owing to moulding shell bar 111 and moulding shell bar 222 thickness
Spending about 3 millimeters of relatively book, install the most crooked, what Fig. 3, Fig. 4 and Fig. 5, Fig. 6 represented respectively is to mould shell bar 111 and
Mould and bottom shell bar 222, be provided with casting lug thereon, increase contact bottom surface, reduce gradient.
What the combination as shown in Fig. 5, Fig. 6 had 24 infrared receiving diodes 2 and 3 moulds shell bar 222, also may be used when being embodied as
By the locus physical dimension of 24 infrared receiving diode combinations, with fill plastic packaging combinations such as the resins of transmissive infrared light
24 infrared receiving diodes.
Embodiment 2
Fig. 7 is the structure chart a of the first photoelectric keyboard device in the present invention, and key 14 right part below, centre, left part are relative
Answering position to be respectively equipped with the front shelves of keyboard 5, middle-grade 8 and rear shelves 13 constitute keyboard frame, front shelves 5 are provided with white key alignment pin 6 and black key
Alignment pin 7, white-black key alignment pin is provided with white-black key, and middle-grade 8 are provided with middle-grade round pin 10, for the location of key 14 fulcrum,
The side of key 14 upper left quarter establishing pouring weight 17, middle-grade 8 forward-facing shelves is provided with the L-shaped silicone elastomer of section thickness about 3～4 millimeters
Bar, elastic adhesive tape 9 is connected to the side of middle-grade 8 by bridge shape air gun nail, and elastic adhesive tape 9 traverses in the lower section of key 14, its another
Limit is slightly shorter, cross-sectional length about 10～15 millimeters, presses close to key 14 bottom surface, and when playing white key 15 or black key 16, elastic strip is pressed.
In the middle part of key 14, fulcrum is arranged over stopping that the pressure key lever 12 jumped when key is played, pressure key lever 12 surrounding paste buffering felt
11 with shockproof noise reduction.Pressure key lever 12 is limited in the middle of middle-grade round pin 10, key 14, support 18 and banking pin 19, though key
Dish is inverted, and key 14 is also unlikely to from middle-grade round pin 10 to slip.This structure is not compared with using elastic adhesive tape 9, hence it is evident that improve
The touching sense that key is played, keyboard sense of touch is more true to nature, and counterweight alleviates the most significantly, eliminates key counterweight the heaviest and rebound not
Good phenomenon, weight and cost are remarkably decreased, owing to the section thickness of elastic adhesive tape 9 is about the ageing-resistant silicone rubber of 3～4 millimeters,
The conducting resinl of the 1 millimeter thickness being far from service life in usual electronic organ or fender conducting resinl keyboard structure can ratio
Intend.
In Fig. 7, the circuit board 20 of detection key 14 action is arranged at after keyboard to be located on the right side of shelves, and each key is corresponding by one
Individual infrared-emitting diode and the optocoupler unit of two infrared receiving diode compositions, infrared-emitting diode is combined in moulds shell
In 111, infrared receiving diode is combined in be moulded in shell 222.Infrared-emitting diode combined plastic shell 111 on corresponding circuits plate 20
With the optocoupler unit in infrared receiving diode combined plastic shell 222, key 14 bottom surface is correspondingly provided with two holes, and shown in Fig. 2
The through hole 40 that black engineering plastics light blocking sheet 4 is provided with and protrusion cylinder 41 interworking, protrude cylinder 41 and embed key 14 bottom surface
Interworking in one hole, positions light blocking sheet 4, and another bullport of through hole 40 and key 14 bottom surface makes screw be easy to connect, side
Just the installation of light blocking sheet 4, it is possible to by key 14 bottom surface recessing, connect with screw after light blocking sheet 4 one side is embedded.
Embodiment 3
Keyboard is generally resolved into some squares walking crosswise and erecting the ranks relation that row are constituted by the circuit design of electronic musical instrument
Battle array scanning circuit, as scanning signal input and the two ends of reading, all keys correspond to the crossover node in ranks.The present invention
88 key electric piano keyboards be defined as the matrix-scanning circuit of 8 × 11 ranks relations, i.e. 8 scanning signal input lines and 22
Scanning signal output (reading) line, wherein, 11 output leads are used for reading on-off switch motion at first in infrared optocoupler unit
Infrared receiving diode output scanning signal, another 11 output leads are used for reading in infrared optocoupler unit on-off subsequently and open
The scanning signal of the infrared receiving diode output of pass action；By reading the infrared of two successively switch motions in a unit
The scanning signal of reception diode output, records the time difference of this unit two infrared receiving diodes successively switch motion,
Thus calculate the dynamics power value that corresponding key is played.
Keyboard light blocking sheet bottom arranges printed circuit board (PCB), each infrared ray optocoupler unit on printed circuit board (PCB), also corresponding each
Individual key, by the most corresponding ranks relation electrical connection, constitutes the matrix-scanning circuit of whole keyboards for musical instruments.Printed circuit board (PCB)
88 infrared ray optocoupler unit of upper installation, each unit spacing and the one group of key axle center being made up of continuous 7 white key and 5 black keys
Spacing is corresponding consistent, and each unit is made up of an infrared-emitting diode and two relative infrared receiving diodes, each
Two infrared receiving diodes of unit are in juxtaposition, 24 infrared receiving diodes of every 12 unit be combined in one complete
Whole black receives pipe and moulds in shell, and 24 infrared receiving diodes are in same receiving plane, and infrared light receives towards identical,
Two infrared receiving diode installation sites of each unit rise poor about 1mm, two infrared receiving diodes of each unit
The most straggly unanimously, the most straggly between whole piece；Every 12 infrared-emitting diodes are combined in a complete black launch
Pipe is moulded in shell, and 12 infrared-emitting diodes are in the same plane of departure, and infrared light emission is towards identical, infrared emission two pole
Pipe rise the centre risen between two infrared receiving diodes that same unit is relative.
Fig. 8 is the Dynamics keyboard matrix-scanning circuit diagram a of the first photoelectric keyboard device (Fig. 7) in the present invention, and wherein E is
5V DC source, C is filter capacitor, and R is current-limiting resistance, and D is infrared-emitting diode, and N is infrared receiving diode, printing
The infrared-emitting diode among 88 infrared ray optocoupler unit on circuit board is multiple is connected into one group, in parallel through current-limiting resistance
On power supply, in the present invention, every 4 infrared-emitting diode strings together, are parallel on 5V power supply through current-limiting resistance, power up
Infrared-emitting diode launches infrared light to two corresponding infrared receiving diodes, and each infrared receiving diode presses Fig. 8 ranks
Composition of relations becomes matrix-scanning circuit, controls mainboard and scans signal from the input of P port, reads key initial actuating from P1 port
The scanning signal of low level infrared receiving diode conducting output, reads key from P0 port and presses rear high-lying infrared receiver completely
The scanning signal of diode current flow output, i.e. obtains the time difference of two infrared receiving diodes successively conducting, by conversion
Play dynamics power value and control source of sound volume.If infrared ray optocoupler unit is installed on the bottom of key key skin, i.e. play position
Lower section, then when playing key, two infrared receiving diodes are from top to bottom successively stopped by light blocking sheet, two infrared receiver two
Pole pipe is successively become cut-off from conducting, thus controls anti-phase audion output scanning signal；Otherwise, such as infrared ray optocoupler unit
Be installed on the bottom of the key other end, i.e. shelves after keyboard, then, when playing key, light blocking sheet is from bottom to top successively cancelled two
The initial isolation of individual infrared receiving diode, two infrared receiving diodes are successively become conducting from cut-off, thus directly export
Scanning signal.This circuit structure is simple and practical, and low cost is highly reliable, has abandoned the corresponding reception of a usual transmitting tube
The optocoupler pattern of pipe, changes corresponding two the novel optocoupler structures receiving pipe of a transmitting tube into；This circuit has also abandoned usual key
Isolating diode in sweeping scanning circuit, and directly isolated by infrared receiving diode self.
Embodiment 4
Fig. 9 is another kind photoelectric keyboard device structure chart b of the present invention, and key 14 tail balancing weight block 17 is for being prone to embed key
Internal lead, the pressure key lever 12 in figure is aluminum alloy materials, and the over top being pressed in round pin 10 pastes buffering felt each other
11 isolation, pressure key lever 12 two ends folding an angle of 90 degrees is screwed in the both sides of keyboard case, and pressure key lever 12 top is by support 18
Compacting, the most also pastes buffering felt 11 and isolates.In Fig. 9, the circuit board 20 of detection key 14 action is arranged at shelves before keyboard
Place, the optocoupler unit that each key correspondence is made up of an infrared-emitting diode and two infrared receiving diodes, and corresponding
Light blocking sheet 4 be also disposed at key 14 and play the bottom surface at position.
Figure 10 is the Dynamics keyboard matrix-scanning circuit diagram b of another kind of photoelectric keyboard device (Fig. 9), and wherein E is 5V direct current
Power supply, C is filter capacitor, and R is current-limiting resistance, and D is infrared-emitting diode, and N is infrared receiving diode, and T is audion,
It is with the circuit difference of Fig. 8, the inverse gate electricity that the negative pole connecting triode T of each infrared receiving diode N is constituted
Road, when pressing key, reads the scanning letter of key initial actuating high position infrared receiving diode conducting output from P1 port
Number, read key from P0 port and press the scanning signal of rear low level infrared receiving diode conducting output completely, try to achieve and play
Dynamics value.
Keyboard force detecting device shown in Fig. 9 and Figure 10, can be applicable to, in the quiet control of traditional mechanical piano, separately set
Interlinked mechanism, during quiet performance, interlinked mechanism stops that piano struck string hammer taps steel wire sounding, and is pronounced by electronics source of sound, through putting
Exported by speaker or earphone greatly.
Embodiment 5
The side view being applied to pianotron of Figure 11 and Figure 12 respectively two kinds of PKB photoelectric keyboards, in Figure 11, keyboard bottom is attached
A casing, tank ends installs speaker, middle circuit such as controlling source of sound of installing, speaker and main electricity in this structure
Road, power supply are installed on the independent base plate outside keyboard case, and general source of sound, power amplifier and power failure can be not switched on keyboard case
Convenient maintenance；In Figure 12, two ends, keyboard case upper strata arrange phase-reversing tube and are arranged on the bass reflex device audio amplifier at the back side, it is possible to as
Multimedia loudspeaker box purposes, the middle matter storage lattice for placing books or ornaments etc., upper strata top cover zone line forward edge and keyboard
Blend stop on case top cover is an inclination angle, it is simple to the music score of Chinese operas leans on, it is possible to separately joins the multiduty moveable spectrum plates such as plastic plate, saves
Music stand plate and connect hinge, and owing to music stand plate and upper strata top cover thickness are the most relatively thin, frequent folding hinge easily come off or
Damaging, Figure 12 novel structure is practical, and multipurpose and outward appearance style, more like true piano.
Claims (10)
1. improve for play a photoelectric keyboard device, including key, front shelves, front shelves circle, white-black key and alignment pin,
Circle middle-grade, middle-grade, middle-grade pin, banking pin, buffering felt, rear shelves, rear shelves bar, pressure key pin, balancing weight, light blocking sheet, printing
Circuit board and power supply, infrared-emitting diode, infrared receiving diode and mould shell, it is characterised in that: by key, front shelves, black and white
The keyboard that key and alignment pin, round pin middle-grade, middle-grade, pressure key lever and support, rear shelves and balancing weight form with printed circuit board (PCB), key
The middle-grade right flank of dish is provided with elastic adhesive tape to the one side of front shelves, and adhesive tape is shaped as L-shaped, L-shaped top slightly shorter press close in key
The bottom surface of position, centre, is provided with light blocking sheet near the bottom surface, key left part position of rear shelves, is provided with the printing electricity of correspondence below light blocking sheet
Road plate, each light blocking sheet can isolate an infrared-emitting diode of correspondence position on printed circuit board (PCB) and two infrared receiver
The infra-red radiation of one group of optocoupler that diode is constituted.
The photoelectric keyboard device for performance of a kind of improvement the most as claimed in claim 1, it is characterised in that described keyboard
On the arm of force of Balance weight end of all keys identical, middle-grade connection that middle-grade round pin is corresponding with all keys, pressure key lever
Surrounding stickup buffering felt is with shockproof noise reduction, and pressure key pin is lying on all keys against middle-grade round pin and banking pin, presses key
Lever two ends are inserted in hole corresponding to keyboard case both sides, are arranged above with support at pressure key lever.
A kind of improvement the most as claimed in claim 1 for the photoelectric keyboard device played, it is characterised in that keyboard each
Key, corresponding one group of optocoupler unit being made up of an infrared-emitting diode and two relative infrared receiving diodes, respectively
By the most corresponding ranks relation electrical connection between unit, constitute the matrix-scanning circuit of whole strength keyboard of musical instrument.
4. improve for play a photoelectric keyboard device, including key, front shelves, front shelves circle, white-black key and alignment pin,
Circle middle-grade, middle-grade, middle-grade pin, buffering felt, rear shelves, rear shelves bar, pressure key pin, balancing weight, light blocking sheet, printed circuit board (PCB) and
Power supply, infrared-emitting diode, infrared receiving diode and mould shell, it is characterised in that: by key, front shelves, white-black key and location
The keyboard that pin, round pin middle-grade, middle-grade, pressure key lever and support, rear shelves and balancing weight form with printed circuit board (PCB), the middle-grade right side of keyboard
Side is provided with elastic adhesive tape to the one side of front shelves, adhesive tape is shaped as L-shaped, L-shaped top slightly shorter press close to key middle position
Bottom surface, is provided with light blocking sheet near the key right station bottom surface of front shelves, is provided with the printed circuit board (PCB) of correspondence below light blocking sheet, each
Light blocking sheet can isolate an infrared-emitting diode of correspondence position on printed circuit board (PCB) and two infrared receiving diode structures
The infra-red radiation of the one group of optocoupler become.
The photoelectric keyboard device for performance of a kind of improvement the most as claimed in claim 4, it is characterised in that described keyboard
The arm of force of the Balance weight end of upper all keys is identical, the middle-grade connection that middle-grade round pin is corresponding with all keys, and pressure key lever is pressed in
The over top of middle-grade round pin, pastes buffering felt isolation between pressure key lever and middle-grade round pin, pressure key lever two ends folding an angle of 90 degrees is used
Screw is fixed on the both sides of keyboard case, and pressure key lever top is provided with support, also paste between pressure key lever and support buffering felt every
From.
The photoelectric keyboard device for performance of a kind of improvement the most as claimed in claim 4, it is characterised in that described keyboard
Each key, corresponding one group by an infrared-emitting diode and two relative infrared receiving diodes, two audions
The optocoupler unit of composition, the negative pole connecting triode composition reverse swing door circuit of described infrared receiving diode, between each unit
By the most corresponding ranks relation electrical connection, constitute the matrix-scanning circuit of whole strength keyboard of musical instrument.
7. the photoelectric keyboard device for performance of a kind of improvement as described in claim 1 or 4, it is characterised in that described bullet
Property adhesive tape be L-shaped, thickness 3～4 millimeters, the length of side 10 that L-shaped is slightly shorter～15 millimeters press close to key bottom surface, slightly long another of L-shaped
The length of side 28～30 millimeters are connected to the middle-grade one side towards front shelves of keyboard, and the light blocking sheet being located at key bottom surface is square, light blocking
The one side that sheet is connected with key bottom surface is provided with a bossy body, and it is recessed that the correspondence position that key bottom surface is connected with light blocking sheet is provided with one
Hole, interworking location in the shrinkage pool of the bossy body embedding key bottom surface of light blocking sheet, light blocking sheet is additionally provided with a through hole, is used for and at the bottom of key
The hole screw that draws in face connects.
8. the photoelectric keyboard device for performance of a kind of improvement as described in claim 1 or 4, it is characterised in that described resistance
One group of optocoupler unit on the printed circuit board (PCB) that mating plate is corresponding, by an infrared-emitting diode and two relative infrared receiver
Diode forms, and two infrared receiving diodes are in juxtaposition, and both rise difference 1 millimeter, relative infrared emission two
Pole pipe corresponding to the middle part of two infrared receiving diodes arranged side by side, infrared-emitting diode rise between relative two red
The centre that outer reception diode is risen.
9. the photoelectric keyboard device for performance of a kind of improvement as described in claim 1 or 4, it is characterised in that described is red
Every 12 of emission diode is a combination, is located at a complete transmitting tube and moulds in shell, spacing with by continuous 7 white key and 5
One group of key axle center spacing of individual black key composition is corresponding consistent, and infrared light emission direction is identical.
10. the photoelectric keyboard device for performance of a kind of improvement as described in claim 1 or 4, it is characterised in that described
Every 24 of infrared receiving diode is a combination, is located at a complete reception pipe and moulds in shell, every two infrared receiving diodes
It is listed as a unit, each unit spacing and the one group of key axle center spacing corresponding being made up of continuous 7 white key and 5 black keys
Causing, infrared light receives towards identical, and two infrared receiving diode height of each unit are straggly unanimously, the most wrong between whole piece
Fall.
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| CN103700364B true CN103700364B (en) | 2017-01-04 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| JP6225076B2 (en) * | 2014-07-08 | 2017-11-01 | ローランド株式会社 | Electronic keyboard instrument |
| CN106781842B (en) * | 2016-11-29 | 2020-05-19 | 大连佳音科技有限公司 | Piano key action self-adaptive identification system and method |
| CN108873095A (en) * | 2018-07-26 | 2018-11-23 | 广州市雅迪数码科技有限公司 | Piano key acts self-adapting detecting circuit |
| CN110474190B (en) * | 2019-08-08 | 2024-06-21 | 南昌华飞物联技术有限公司 | Electric shock prevention socket |
| CN115206272A (en) * | 2022-02-22 | 2022-10-18 | 蒋恩良 | Electronic keyboard musical instrument |
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| CN2618254Y (en) * | 2003-05-21 | 2004-05-26 | 孙玮 | Photoelectric digital tester for playing acts on piano keyboard |
| CN101794569A (en) * | 2010-01-22 | 2010-08-04 | 上海九歌乐器音响有限公司 | Photoelectronic device for touch response of musical instrument |
| CN201732556U (en) * | 2010-02-04 | 2011-02-02 | 马季平 | Optoelectronic device of strength keyboard of musical instrument |
| CN203616985U (en) * | 2013-12-12 | 2014-05-28 | 马季平 | Improved photoelectric keyboard device for playing |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4479554B2 (en) * | 2005-03-23 | 2010-06-09 | ヤマハ株式会社 | Keyboard instrument |
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|---|---|---|---|---|
| CN2618254Y (en) * | 2003-05-21 | 2004-05-26 | 孙玮 | Photoelectric digital tester for playing acts on piano keyboard |
| CN101794569A (en) * | 2010-01-22 | 2010-08-04 | 上海九歌乐器音响有限公司 | Photoelectronic device for touch response of musical instrument |
| CN201732556U (en) * | 2010-02-04 | 2011-02-02 | 马季平 | Optoelectronic device of strength keyboard of musical instrument |
| CN203616985U (en) * | 2013-12-12 | 2014-05-28 | 马季平 | Improved photoelectric keyboard device for playing |
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