CN109087622A - A kind of portable electric wooden drum - Google Patents
A kind of portable electric wooden drum Download PDFInfo
- Publication number
- CN109087622A CN109087622A CN201811186714.0A CN201811186714A CN109087622A CN 109087622 A CN109087622 A CN 109087622A CN 201811186714 A CN201811186714 A CN 201811186714A CN 109087622 A CN109087622 A CN 109087622A
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- Prior art keywords
- sensing device
- metal guide
- wooden drum
- portable electric
- metal
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- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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- 238000009527 percussion Methods 0.000 claims abstract description 26
- 230000005611 electricity Effects 0.000 claims abstract description 23
- 230000006698 induction Effects 0.000 claims abstract description 11
- 238000010079 rubber tapping Methods 0.000 claims abstract description 10
- 230000001939 inductive effect Effects 0.000 claims abstract description 9
- 229910052751 metal Inorganic materials 0.000 claims description 60
- 239000002184 metal Substances 0.000 claims description 60
- 230000007246 mechanism Effects 0.000 claims description 6
- 229920000049 Carbon (fiber) Polymers 0.000 claims description 4
- 239000004917 carbon fiber Substances 0.000 claims description 4
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 claims description 4
- 230000004044 response Effects 0.000 abstract description 4
- 239000000463 material Substances 0.000 description 12
- 229910052782 aluminium Inorganic materials 0.000 description 8
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 8
- 230000006872 improvement Effects 0.000 description 6
- 230000008878 coupling Effects 0.000 description 5
- 238000010168 coupling process Methods 0.000 description 5
- 238000005859 coupling reaction Methods 0.000 description 5
- 239000004411 aluminium Substances 0.000 description 4
- 239000000084 colloidal system Substances 0.000 description 4
- 239000002023 wood Substances 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 239000010410 layer Substances 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 239000007787 solid Substances 0.000 description 3
- 241001077262 Conga Species 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 2
- 239000004020 conductor Substances 0.000 description 2
- 238000010276 construction Methods 0.000 description 2
- 239000003292 glue Substances 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 230000033764 rhythmic process Effects 0.000 description 2
- 238000003786 synthesis reaction Methods 0.000 description 2
- 230000001960 triggered effect Effects 0.000 description 2
- 206010003694 Atrophy Diseases 0.000 description 1
- 239000004831 Hot glue Substances 0.000 description 1
- 208000028382 Tympanic membrane disease Diseases 0.000 description 1
- 238000004026 adhesive bonding Methods 0.000 description 1
- 230000037444 atrophy Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000000919 ceramic Substances 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 239000003086 colorant Substances 0.000 description 1
- 235000013399 edible fruits Nutrition 0.000 description 1
- 238000004880 explosion Methods 0.000 description 1
- 239000010985 leather Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000003340 mental effect Effects 0.000 description 1
- 230000002688 persistence Effects 0.000 description 1
- 239000011120 plywood Substances 0.000 description 1
- 230000005855 radiation Effects 0.000 description 1
- 238000005070 sampling Methods 0.000 description 1
- 239000002344 surface layer Substances 0.000 description 1
- 229920002994 synthetic fiber Polymers 0.000 description 1
Classifications
-
- G—PHYSICS
- G10—MUSICAL INSTRUMENTS; ACOUSTICS
- G10H—ELECTROPHONIC MUSICAL INSTRUMENTS; INSTRUMENTS IN WHICH THE TONES ARE GENERATED BY ELECTROMECHANICAL MEANS OR ELECTRONIC GENERATORS, OR IN WHICH THE TONES ARE SYNTHESISED FROM A DATA STORE
- G10H1/00—Details of electrophonic musical instruments
- G10H1/32—Constructional details
-
- G—PHYSICS
- G10—MUSICAL INSTRUMENTS; ACOUSTICS
- G10H—ELECTROPHONIC MUSICAL INSTRUMENTS; INSTRUMENTS IN WHICH THE TONES ARE GENERATED BY ELECTROMECHANICAL MEANS OR ELECTRONIC GENERATORS, OR IN WHICH THE TONES ARE SYNTHESISED FROM A DATA STORE
- G10H3/00—Instruments in which the tones are generated by electromechanical means
- G10H3/12—Instruments in which the tones are generated by electromechanical means using mechanical resonant generators, e.g. strings or percussive instruments, the tones of which are picked up by electromechanical transducers, the electrical signals being further manipulated or amplified and subsequently converted to sound by a loudspeaker or equivalent instrument
- G10H3/14—Instruments in which the tones are generated by electromechanical means using mechanical resonant generators, e.g. strings or percussive instruments, the tones of which are picked up by electromechanical transducers, the electrical signals being further manipulated or amplified and subsequently converted to sound by a loudspeaker or equivalent instrument using mechanically actuated vibrators with pick-up means
- G10H3/146—Instruments in which the tones are generated by electromechanical means using mechanical resonant generators, e.g. strings or percussive instruments, the tones of which are picked up by electromechanical transducers, the electrical signals being further manipulated or amplified and subsequently converted to sound by a loudspeaker or equivalent instrument using mechanically actuated vibrators with pick-up means using a membrane, e.g. a drum; Pick-up means for vibrating surfaces, e.g. housing of an instrument
Abstract
A kind of portable electric wooden drum, the wooden drum, which is equipped with, taps surface and sensing device, and the sensing device is set to the downside for tapping surface one end, and the sensing device is also connected with electricity output line；It further include bottom surface, described percussion surface one end and described bottom surface one end are hinged, accompany sensing device between the percussion surface other end and the bottom surface other end；The sensing device includes induction side and non-inductive side, and the induction side, which is attached to, taps surface, and non-inductive side is attached to bottom surface, and the sensing device is connected with electricity output line.A possibility that musical instrument feedback in the present invention and string sound, is all minimum, and voice response is true, tone color details capture it is sensitive, without noise without string acoustic sound efficiency and the double height of quality, it is small and exquisite be succinctly convenient for carrying, durable foot step on it is not bad.
Description
Technical field
The present invention relates to musical instrument field, especially a kind of portable electric wooden drum.
Background technique
The idiophonic composition of electroacoustic class generally comprises a primary piezo-electric device or other types on the market at present
Sensing device, be attached on wooden (or other materials) surface layer of synthesis；Incude wooden or other materials the table of its attachment
The firmly degree that layer is tapped by user or drummer.Amplitude/signal strength is detected by MIDI electronic device, then " is triggered "
The output pre-recorded and stored, what these original sound drum tone colors pre-recorded usually stored in digital form.In the existing technology
In, synthesis wood is attached to using low-quality sensing device or glued board taps face, is pre-recorded with triggering and is sampled the side of tone color output
Formula can not reproduce various careful strike performances, lower tone in percussion music performance, be confined to using " triggering " " sampling tone color "
Mode.If sensing device is only used as " triggering " mechanism use, any background noise is likely to occur by the way, and audience will
It hears the tone color of pre-recording being triggered, rather than causes " to trigger " original signal of mechanism itself.
For example, tapping surface tapping using wire brush, or touched with drum stick, the basic area of sensing device in the prior art
Divide and does not come out.More it is not possible that reproducing wire brush comforts fruit of proving effective.Also can not distinguish percussion when use hand, be foot or
Other apparatus such as drum stick.
In the prior art, such as card flood drum (Cajon) is exactly a cuboid box, and there are six faces altogether, usually wooden
Plywood is made, and adheres to sensing device on one of face or more than one face.But more be on one of face
There is a circular hole, for microphone to put in pickup；And the structure of conga drum (djembe) is exactly drum head and cavity and will
Circle of the drum head hoop on cavity, cavity are usually formed with log borehole, and there are also the products that synthetic material is molded.Africa
Bulging drum bottom is empty, if microphone is directed at drum surface, high frequency can be excessive inside the tone color of pickup, however for side when performance
It just, often have to be from drum surface pickup.Low frequency is picked up generally for more, to enter from drum end stretch microphone, thus need
Solid firm drum is made, very trouble, and conga drum itself is not so portable；Such musical instrument is mostly all
Microphone is needed to amplify primary sound.Microphone tends to feedback (uttering long and high-pitched sounds), also tends to the sound for picking up other neighbouring musical instruments
(string sound), thus idiophonic fidelity is affected to a certain extent.
Existing technology, the sensing device of low-quality, the low output of use are used to amplify without the electric signal of height output, as
Jazz is this to require careful soft percussion music to show, be easy for becoming inside noise or electronic circuit fizz.Not yet
There is the sensing device of high output high-quality, just without signal source strong enough, signal-to-noise ratio is with regard to low.
Summary of the invention
In order to overcome the disadvantages mentioned above of the prior art, the object of the present invention is to provide one kind can solve above-mentioned technical problem
A kind of portable electric wooden drum.
The technical solution adopted by the present invention to solve the technical problems is: a kind of portable electric wooden drum, in which: the wood
Drum, which is equipped with, taps surface and sensing device, and the sensing device is set to the downside for tapping surface one end, the induction dress
It sets and is also connected with electricity output line；
It further include bottom surface, described percussion surface one end and described bottom surface one end are hinged, and the percussion surface is another
Sensing device is accompanied between end and the bottom surface other end；
The sensing device includes that induction side and non-inductive side (i.e. inertia side), the induction side are attached to percussion table
Face, non-inductive side are attached to bottom surface, and the sensing device is connected with electricity output line.
As a further improvement of the present invention: the sensing device is equipped with metal shell, inside the metal shell
Fastening, which clamps, several piezoelectric units, plays good coupling, the metal shell is connected with negative line and is grounded, institute
Positive contact and insulating trip are additionally provided with inside the metal shell stated, the positive contact is equipped with electrode line.
As a further improvement of the present invention: the metal shell is metal guide groove and metal guide rail, and the metal is led
Rail is aluminum strip, for forming the non-inductive side of entire sensing device as inertia side.The metal guide groove covers piezoelectric element shape
At induction side, the induction side, which is attached to, taps surface, and the non-inductive side (i.e. inertia side) is attached to bottom surface.
As a further improvement of the present invention: the metal guide groove matches with the metal guide rail；The sense
Device is answered to be successively arranged metal guide groove, insulating trip, positive contact, several piezoelectric units and metal guide rail, several piezoelectricity
Unit is coupled among the metal guide groove and metal guide rail by fixed mechanism.
As a further improvement of the present invention: the electricity output line is connected to the preamplifier of volume and tone color control
On；The electricity output line is single-core shielding line.
As a further improvement of the present invention: the percussion surface is made using log clamping plate or carbon fiber board.
As a further improvement of the present invention: the piezoelectric unit is piezoelectric transducer.
Compared with prior art, the beneficial effects of the present invention are:
For the log clamping plate or carbon fiber board that the present invention uses high-quality as percussion face, such material is sufficiently thin, because
And fundamental frequency is sufficiently low, can respond out more typical drum head formula low frequency tone color, the accordatura of drum head itself is sufficiently low, it is enable to send out
The metronome to match out with music rhythm.
Single foot or both feet can be used to step on and play for product in the present invention, and can tell and whether wear shoes, and the leather shoes worn are also
It is sandals, it is very sensitive that wire brush, drum stick, hand or any other apparatus, sensing device used also can be used.
A possibility that musical instrument feedback in the present invention and string sound, is all minimum, and voice response is true, tone color details capture it is sensitive,
No noise without the double height of string acoustic sound efficiency and quality, it is small and exquisite be succinctly convenient for carrying, durable foot step on it is not bad.
Detailed description of the invention
Fig. 1 is one structural schematic diagram of embodiment of invention；
Fig. 2 is partial structural diagram of the invention；
Fig. 3 is partial structurtes perspective view of the explosion of the invention；
Fig. 4 is two, three, four structural schematic diagram of the embodiment of the present invention；
Fig. 5 is use state of the invention with reference to figure.
Specific embodiment
Now in conjunction with Detailed description of the invention, the present invention is further described with embodiment:
Embodiment one:
Referring to figs. 1 to 3 and Fig. 5, a kind of portable electric wooden drum, in which: wooden drum, which is equipped with, taps surface 1 and sensing device 2,
Sensing device 2 is set to the downside for tapping 1 one end of surface, and sensing device 2 is also connected with electricity output line 4.
Sensing device 2 is equipped with the metal shell 21 that aluminum material is made, and fastening, which clamps, inside metal shell 21 four
A or six piezoelectric units 22, piezoelectric unit are piezoelectric ceramics stick, and piezoelectric unit quantity is fewer, and noise is bigger, because obtaining
Signal source it is not strong enough, piezoelectric unit quantity is more, and signal is bigger, and noise is with regard to smaller.Metal shell 21 is connected with negative line
And be grounded, positive contact 23 and insulating trip 24 are additionally provided with inside metal shell 21, positive contact 23 is equipped with electrode line.Metal shell
21 be metal guide groove 211 and metal guide rail 212, and metal guide groove 211 matches with metal guide rail 212；Sensing device 2 is successively arranged
Metal guide groove 211, insulating trip 24, positive contact 23, piezoelectric unit 22 and metal guide rail 212, piezoelectric unit 22 pass through fixed machine
Structure is coupled among metal guide groove 211 and metal guide rail 212.
Electricity output line 4 is connected on the preamplifier 5 of volume and tone color control；Electricity output line 4 is single-core shielding line.
When impact taps surface, sensing device 2 acquires sound and is sent on preamplifier 5.
Sensing device 2 in this embodiment can be bonded on the downside of the one end for tapping surface, also can be only placed in and be tapped surface
One end on the downside of, do not have to fixation also may be used.
Embodiment two:
Referring to figs. 2 to 5, wooden drum, which is equipped with, taps surface 1 and sensing device 2, and sensing device 2, which is set to, taps 1 one end of surface
Downside, sensing device 2 is also connected with electricity output line 4.
Further include bottom surface 3, tap 1 one end of surface and 3 one end of bottom surface is hinged, percussion 1 other end of surface is another with bottom surface 3
Sensing device 2 is equipped between end, sensing device 2 is installed on bottom surface 3.
The percussion surface 1 and bottom surface 3 that the strike wooden drum is hinged using two panels form shears-like movement structure, and can open
It closes and a sensing device 2 is installed at vibration, sensing device 2 is equipped with electricity output line 4, puts before being connected to volume and tone color control
Big device 5；Sensing device 2 forms acquisition data component using the good piezoelectric unit 22 of 21 inner clamps close coupling of metal shell,
Sensing device 2 is installed on bottom surface 3；When percussion surface 1 is struck, the percussion surface 1 of shears-like movement structure is moved,
On sensing device 2, sensing device 2 acquires voice data for impact, by the output to preamplifier 5 of electricity output line 4.
Wooden drum, which is equipped with, taps surface 1 and bottom surface 3, taps 1 one end of surface and 3 one end of bottom surface is hinged, hinged mode may be used also
To take stickup or other modes to be connected；It taps and is equipped with sensing device 2 among 1 other end of surface and the other end of bottom surface 3, i.e.,
It taps surface 1 and bottom surface 3 clips sensing device 2, sensing device 2 is installed on above the other end of bottom surface 3, and sensing device 2 can be put
Sound can anywhere be generated in bottom surface 3, and be placed on bottom surface 3 most while while on it is optimal, primarily to allowing different positions
Volume and the tone color difference set become apparent from, that is, closer to sensing device 2, sound is bigger, and sound is smaller more far away, level
It is richer.Sensing device 2, which uses, to be pasted, adheres to or adopt the other end for being screwed in bottom surface 3.And it is scissor construction so that this
When kind musical instrument is stepped on by foot, one of face is deformed on another face and is unlikely to rupture, and persistence is preferable, can be used to play
It stamps one's foot rhythm.
The percussion surface 1 and bottom surface 3 are geometry, can be for rectangle, square, round or ellipse wherein
A kind of shape, material are solid wood clamping plate or carbon fiber board, and the one side for tapping surface and bottom surface is hinged, and three sides are without fixation.Wherein, long
Whether there is or not three fixed sides freely to vibrate with bottom surface on rectangular or rectangular percussion surface, and round or ellipse shape is struck
Hit surface and to have 90 ° of arc sides to carry out hinged for bottom surface, and remaining 270 ° of arc sides be without fixed side, can free vibration.
Sensing device 2 is equipped with metal shell 21, and fastening, which clamps, inside metal shell 21 several piezoelectric units 22, plays good
Good coupling, metal shell 21 are connected with negative line and are grounded, and positive contact 23 and absolutely is additionally provided with inside metal shell 21
Embolium 24, positive contact 23 are equipped with electrode line.Metal shell 21 can be used aluminum material and be made.
The sensing device feature with the following functions:
1) output power of piezoelectric element；
2) there is the biggish side of quality as inertia side i.e. non-inductive side, vibrated for incuding side relative to it；
3) coupling is good, mono- independent individual of Cheng Qiwei.
Several piezoelectric units 22 can be 4 or 6 or other quantity, or use the piezoelectric unit 22 of one piece of entirety also
It can.
Sensing device 2 is connected with electricity output line 4；Electricity output line 4 is connected to the preamplifier 5 of volume and tone color control
On.
Metal shell 21 is metal guide groove 211 and metal guide rail 212, and metal guide groove 211 matches with metal guide rail 212；
Sensing device 2 is successively arranged metal guide groove 211, insulating trip 24, positive contact 23, several piezoelectric units 22 and metal guide rail 212,
Several piezoelectric units 22 are coupled among metal guide groove 211 and metal guide rail 212 by fixed mechanism；Pre-assembly and good
Then the sensing device 2 of coupling is attached to idiophonic percussion surface 1, piezoelectric unit 22 is all clamped to improve in device
The sound conduction rate in portion, improves efficiency.Fixed mechanism can be to be fixed using screw structural or bonding method.
Metal guide groove 211 and metal guide rail 212 can be used aluminium material and be made.
2 shell of sensing device is additionally provided with conductive material layer, forms cathode；Wherein shell is also connected with negative line.
Embodiment three:
Referring to figs. 2 to 5, a kind of portable electric wooden drum, in which: wooden drum, which is equipped with, taps surface 1 and sensing device 2, induction dress
It sets 2 and is set to the downside for tapping 1 one end of surface, sensing device 2 is also connected with electricity output line 4.
Further include bottom surface 3, taps 1 one end of surface and be fixedly connected with 3 one end of bottom surface, tap 1 other end of surface and bottom surface 3
Sensing device 2 is equipped between the other end, and sensing device 2 is coated with colloid, and sensing device 2 is fixed on by colloid
It taps on surface 1 and bottom surface 3.
When production, first sensing device 2 is sticked to AB glue and is tapped on surface 1, is then covered sensing device 2 with a mold
Get up, then hot melt adhesive or AB glue are perfused inside, wait gellings to consolidate after atrophy, then mold is taken off, colloid package is made
Sensing device 2.The another side of this colloid is finally sticked to bottom surface 3 again, including electricity output line 4 is also to tap surface 1.
2 technology of sensing device of the present embodiment is consistent with embodiment two.
Example IV:
With reference to the percussion surface 1 that Fig. 4 to 5, two panels are hinged, a sensing device 2 is included, an electricity output line 4 is connected to
Volume and tone color control preamplifier 5.
The percussion surface 1 of the shapes such as two panels rectangle or square, ellipse, circle, material be solid wood clamping plate or other
Material is hinged on one side, and three sides can freely be vibrated without fixation, no three fixed sides.
When it is round for tapping surface 1, the range with 270 degree or so, can free vibration without fixation；For that of strike
A face more can freely vibrate.
When needing the response of upper frequency, fixed side length is needed to increase accordingly, that is, needs the side length of fixed whole, or
The side length of half.
Or at the percussion surface 1 of round or ellipse, 360 degree to fix.Or depending on thinking frequency response to be achieved
Determine fixed side length.
It is the one end being hinged in two sheet materials, places a sensing device 2 among two sheet materials, be attached to for percussion
On upper surface, the vibration on the surface is picked up.
Sensing device 2:
Sensing device 2 includes 4 or more (usually 6) piezoelectric units 22, to reach higher signal output, wherein
Piezoelectric unit 22 is fewer, and noise is bigger, because the signal source obtained is not strong enough, piezoelectric unit more than 22, signal is bigger, makes an uproar
Sound is with regard to smaller；Or the biggish piezo-electric device of single one also can be used instead of several piezoelectric units 22.
Sensing device 2 includes a pair of aluminum or other lightweight conductives and the conductive metal of relative rigid structures, composition one
The entirety of a clamping, this pair of of metal structure mutually with fastened by screw together, in this way inside piezoelectric unit 22 be compressed to
And it firmly couples.
In the outside of piezoelectric unit 22, there are also layer of conductive material, surround or substantially surround whole device, form device
Cathode is also responsible for electromagnetic shielding (RF shielding).From the device interference with radio radiation.
The side of sensing device 2 is the side that piezoelectric element is clamped at aluminium guide groove or the like part, this side is as sense
Side is answered, is fixed on clamping plate percussion face in a manner of screw or gluing.
An insulating trip 24 is equipped between the aluminium guide groove and positive contact 23 of 2 main structure of sensing device；
Electrode line picks out to come from positive contact 23.
Negative line is connected on aluminium guide barrel construction body, therewith constitutes ground (cathode) and the shielding of whole device.
Electricity output line 4 is fixed on that beneath sheet material, that is, that block plate of non-percussion face.
Then electricity output line 4 is inserted into 5 box of preamplifier, this box can have tone color to control network.
In conclusion after those skilled in the art read file of the present invention, according to the technique and scheme of the present invention with
Technical concept is not necessarily to creative mental labour and makes other various corresponding conversion schemes, belongs to the model that the present invention is protected
It encloses.
Claims (5)
1. a kind of portable electric wooden drum, it is characterised in that: the wooden drum, which is equipped with, taps surface and sensing device, the induction
Device is set to the downside for tapping surface one end, and the sensing device is also connected with electricity output line；
Further include bottom surface, described percussion surface one end and described bottom surface one end are hinged, the percussion surface other end with
Sensing device is accompanied between the bottom surface other end；
The sensing device includes induction side and non-inductive side, and the induction side, which is attached to, taps surface, the attachment of non-inductive side
In bottom surface, the sensing device is connected with electricity output line.
2. a kind of portable electric wooden drum according to claim 1, it is characterised in that: the sensing device is equipped with outside metal
Shell 21, fastening, which clamps, inside the metal shell 21 several piezoelectric units, and the metal shell 21 is connected with negative line
And be grounded, positive contact and insulating trip are additionally provided with inside the metal shell 21, the positive contact is equipped with electrode line.
3. a kind of portable electric wooden drum according to claim 1, it is characterised in that: the metal shell 21 is led for metal
Slot and metal guide rail, the metal guide groove match with the metal guide rail；The sensing device is successively arranged metal
Guide groove, insulating trip, positive contact, several piezoelectric units and metal guide rail, several piezoelectric units pass through fixed mechanism quilt
It is coupled among the metal guide groove and metal guide rail.
4. a kind of portable electric wooden drum according to claim 1, it is characterised in that: the electricity output line is connected to volume
On the preamplifier of tone color control；The electricity output line is single-core shielding line.
5. a kind of portable electric wooden drum according to claim 1, it is characterised in that: the percussion surface is pressed from both sides using log
Plate or carbon fiber board are made.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811186714.0A CN109087622B (en) | 2018-10-12 | 2018-10-12 | Portable bakelite drum |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811186714.0A CN109087622B (en) | 2018-10-12 | 2018-10-12 | Portable bakelite drum |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN109087622A true CN109087622A (en) | 2018-12-25 |
| CN109087622B CN109087622B (en) | 2024-04-16 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201811186714.0A Active CN109087622B (en) | 2018-10-12 | 2018-10-12 | Portable bakelite drum |
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| Country | Link |
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| CN (1) | CN109087622B (en) |
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| DE102010063385A1 (en) * | 2010-12-17 | 2012-06-21 | Robert Bosch Gmbh | piezo actuator |
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| Publication number | Publication date |
|---|---|
| CN109087622B (en) | 2024-04-16 |
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