CN1330351A - Multifunctional experiment demonstrator set - Google Patents
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- CN1330351A CN1330351A CN 00106357 CN00106357A CN1330351A CN 1330351 A CN1330351 A CN 1330351A CN 00106357 CN00106357 CN 00106357 CN 00106357 A CN00106357 A CN 00106357A CN 1330351 A CN1330351 A CN 1330351A
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Abstract
A multifunctional experiment demonstrator set for the physics education is composed of radio, microphone, audio recorder, video recorder and VCD, and can be used to demonstrate current, electromagnetic effect, electrothermal effect, sound-vibration conversion, sound-electricity conversion, hot expansion and cold contraction, back purge (reacting force) etc.
Description
This instrument is combined type series instruments used for education that fill in the gaps to complete a chain.Be applicable to primary school nature, middle school physics kinds of experiments, the teaching of demonstration is used.
Understanding to this instrument, retrieval, examination has the prior art of reference role to have: the primary school nature subject has J218 primary school acoustics experiment box, J219 calorifics laboratory box, J221 solid cubical expansion demonstration device, J239 electric current experiment box, J106 primary school laboratory power supply (12V/10A), J334 ear are dissected exaggeration model; Middle school physics has J1202 student's power supply (9V/1.5A), J1209 Power supply for teaching (12V/2A voltage stabilizing), J2137 mechanics of high school calorifics combined appliance for teaching, J2258 metal wire expansion demonstration device, J2259 solid contract power demonstration device, J2368 illustrative circuitry brassboard, J2369 student experimenting demonstration board, J2273 junior middle school Experiments of Electricity demonstration box, J2443 junior middle school electricity student experimenting case, J2439 electromagnetism tester, J2481 transformation of energy demonstration device; Middle school physiology has J3310 ear anatomical model.
In order to give student experimenting, demonstration provides novel, practical, convenient, fast, directly perceived and interesting instrument and equipment, is the purpose that this instrument is created in design to cultivate the students innovation spirit and the ability of practice, to push forward quality-oriented education comprehensively.
This instrument is made up of main frame and annex one magnetoelectricity demonstration device and hot demonstration device three parts of annex two power.
Main frame is by the low-voltage AC (adjustable every 1.5V) of 150W transformer output 0-12V/10A, by K
2Selection provides required low-voltage alternating current power supply.0-6V (adjustable every 1.5V) is by K
3Select to regulate required voltage, behind the 10A50V rectifier rectification, meet double-point double-throw switch K
4(K
4Can change direction of current fast), output terminal, to the direct current output wiring terminal, one of brightness pilot lamp in parallel and direction of current pilot lamp are two between two binding posts, the direction of current pilot lamp bright, go out by two rightabout diodes place of switches usefulness of connecting with lamp; Output 21+21/3A alternating current is through the 3A100V rectifier rectification, undertakes the working power (as use 155 or 1100 instead, output changes 17+17V or 26+26V) that positive and negative each 29V is provided to " fool " 175 back grade sound equipment power amplifier integrate circuits after filtering; The little electric current of output 1.1V is undertaken the working power that 1.5V is provided to microphone pre-amplifier 3AG1 behind rectifying and wave-filtering.(because of the microphone signal electric current a little less than, so adding 3AG1 amplifies, again because of only differ from a variable condenser and a bar magnet, coil just possesses simple function of radio receiver, therefore add function of radio receiver, be peak value before the rectifying and wave-filtering also because of the voltage of alternating current behind rectifying and wave-filtering, be 1.414 times of former alternating voltage, so 1.1V is the 1.5V direct current behind rectifying and wave-filtering.)。
Magnetic antenna is 6 circles with 10 * 100 bar magnet (flat circle all right) between 70 circles 2,3 with seven strands of cotton-covered wires, (as use 360P air Dan Lian instead, coil is used 60 circles instead.All element is installed in to weld on printed circuit board (PCB), panel, base plate and the squab panel by figure one principle and gets final product.Install debugging radio reception part 3AG1 base stage variable-resistance value, determine when reaching best sound effects that its value changes fixed resistance.
Annex two is magnetoelectricity demonstration devices.Character for convenient and swift demonstration electromagnet, except that adopting, main frame changes fast the direction of current, here adopted the measure of quick change direction of winding, method is that (iron core can be used the round steel of φ 14-18, long 80-100 on same iron core with positive and negative two groups of coils, the overcoat bobbin, iron core should burn red in fire after slowly use after the cooling, in order to avoid produce remanent magnetism), the overcoat bobbin, with φ 0.1 to 0.2 enameled wire coiling (can not be too thick), should reach about 5 Ω after winding.The top of two coils connects the A point, end connects B, C point respectively, outsourcing insulating paper then, in external packing with more slightly, more eye-catching red, green line (or other two colo(u)r streak but never be lead) the actual direction of winding of press AB, AC respectively is connected AB, AC (in order to indicate direction of winding) with mode of connection, A connects a certain utmost point of power supply, and B, C be order double-pole double throw switch K respectively
5Two contacts need only be stirred K
5, can change direction of winding fast.Other original paper is pressed figure two principle windings and is got final product.(magnetoelectricity demonstration device band fusing fuse; do not establish the automatic power-off protecting circuit of short circuit in the main frame; because output current is bigger, exchange, direct current all reaches 10A, lead is all thinner in the experimental circuit; even wrong short circuit; can burn experiment lead plastic skin, all burning-tolerant secondary coil and rectifier, the outer Fuse Type fuse grouping of employing machine insurance; in order to avoid the wrong short circuit of a winding causes " having a power failure " to influence other group experiment completely.)。
Annex two by recoil (reacting force) demonstration device, electric heating, solid expands with heat and contract with cold and incandescent lamp principle of luminosity demonstration device four parts are formed desk lamp and rotated aircraft-type.(four parts all can be established one's own system, and individualism is also independent to be used).
The recoil demonstration device is that the pedestal rotation is arm-type, and a model of an airplane is installed respectively on double armed lever, incites the proal principle of the gas generation reacting force promotion model of an airplane backward according to screw propeller and makes.Power is provided by two toy motors (also available shaver with motor or other direct current motor), because the model of an airplane moves, this has just determined that lead mode of connection method must be an electric brush type, chassis and vertical rod are metals, can replace a lead, founding plastic material in this way, this root lead should extend to ring in the metal bearing, and another root lead is passed by the vertical rod hole and is connected on brush terminal screw place.Whether unimpeded what can brush and becket contact good and friction is suitably assurance model aircraft power supply key, loose contact, power supply is obstructed or off and on, motor does not change or walks around and stop, model aircraft can not normally travel forward, as contact tension and can produce very big friction force, when greater than reacting force, though motor runs well, owing to do not overcome friction force, the model of an airplane just can not travel forward, so brush has just become the critical component of this demonstration device, brush is made figure 15 shapes, the examination of friction force adjustable size.Need only regulating spring lower end bolt, be the friction force size between scalable brush and the becket.
The method for making of line style tubulose demonstrating expansion on heating and contraction on cooling device directly perceived is; (laboratory glass tube in the grass tube of φ 5.5 to 7.5, external diameter is generally between 5.5 to 7.5, select thick), install and fix a segment length about 100 150W electric soldering iron silk, the copper lead-in wire of electric soldering iron silk one end and φ 0.7 directly is connected, the other end links to each other with " ten " shape pointer made from φ 0.7 copper cash, the spring of the φ about 2.5 of the steel wire coiled of pointer and φ 0.22 links to each other, the long 18-20 of spring, the spring other end is connected with φ 0.7 bronze medal lead-in wire, and stride wire spring to copper lead-in wire at " ten " shape pointer and connect scroll copper lead-in wire, manage with brazing jail (first solder taul at " ten " word pointer place and copper lead-in wire place, after connect spring), scroll copper goes between comparable copper lead-in wire carefully, with φ 0.3-0.4 just, the screwed pipe of copper scroll lead-in wire is more bigger than spring, and is littler than glass tube internal diameter, do not produce friction and be advisable with capable of expansion and contraction, (purpose of doing like this is to avoid electric current to flow through spring in a large number to produce electric heating spring is disappeared because of annealing).The lead-in wire crotch and hook the copper lead-in wire with 5 newton's dynamometer and draw, pulling force makes spring elongation 10-15 (pulling force can not be excessive, burns red electric soldering iron silk and break otherwise easily make) between 2.5-4.5 newton.With blowtorch scorification glass tube.At lampshade appropriate location poster the blank sheet of paper place of milimeter scale is arranged, make " ten " font pointer aim at " 0 " and locate to get final product.Also can be fixed on independent use the on other plate).
The method for making of electric heating demonstration device is the long one section electric soldering iron silk (electric soldering iron of 100-150W) of 60-80 nearly, and the coiled solenoid shape is connected by lead-in wire and to pass porcelain diplopore pipe (this pipe on the 150W electric soldering iron), is fixed on the chassis to get final product.(also can independently use)
Incandescent lamp principle of luminosity demonstration device is the tubular lamp (bread bicycle shed lamp, in order that with the analogy mutually of line style pipe heater) of " one " font with the 12V5W filament, with demonstrating expansion on heating and contraction on cooling device secured in parallel in lampshade, the sky that can hold coiled pipe is left in the centre.Lead is by passing in vertical rod, the coiled pipe, the application plug of pressing that figure three wiring (order change also can) certainly get final product and main frame joins, and the squab panel of main frame is established AC socket.
As not inciting gas backward after the rotation of annex two motor, can change the direction of propeller blade torsion angle, also can change figure three diode connections (connect conversely and get final product).
Multifunctional experiment demonstrator set compared with prior art, the advantage and the good effect that are had are as follows:
One, function many, can develop:
Existing instruments used for education function is few, and instruments used for education that have are function, many just two only, as J106 and J1202, can only provide the AC and DC low-tension supply.These instruments used for education can not only provide the AC and DC power supply and can also provide sound source (to possess the enlarger function, than enlarger simple structure, cheap.) change direction of current and electromagnet wire-wound direction fast, can also be shown to the student to invisible size of current and direction of current by pilot lamp sees, the experiment that decapacitation work and annex match and cooperate, demonstration, can also cooperate the effect of other instruments used for education (with non-instruments used for education) demonstration eardrum, how sound produces, the analog demenstration ear is how to hear sound, the demonstration conductor, insulator, semiconductor, cooperate J245 demonstration radio principle, can also be used for Music Appreciation in addition, the meeting-place amplifies, setting-up exercises to radio music amplify, sound-track engraving apparatus, video recorder, VCD multiple use such as amplify.
Two, easy to operate, quick, intuitively effective.
When 1, the J221 of primary school solid cubical expansion demonstration device is demonstrated, be to allow the observation of students copper ball can pass ring earlier, then copper ball is tested after 3-5 minute in heating on the spirit lamp flame again, ball can not pass ring, " experimental demonstration repeatedly ", " student is difficult to take out the character that solid expands with heat and contract with cold ", experiment " certain difficulty and danger are arranged " " does not meet the program of scientific research, the student is not had cogency." (" primary school nature teaching " 2000 3 phases 34 pages).This instrument line style tube-type solid demonstrating expansion on heating and contraction on cooling device only needs energising 3 seconds, just can see significantly that the pointer of indication heating wire length moves on scale, indication thermal expansion coefficients certificate can not only be demonstrated heat expansion, can also demonstrate shrinkage power, not only can be qualitative, and can be quantitatively.
2, on " electric heating " one class teaching material be allow the student with hand go to touch be connected on battery two interpolars thin wire whether heat be familiar with the electric heating notion.Not " " electric heating " one class do experiment effect not obvious really " " student does not have directly perception electric heating " (" primary school nature teaching " 2000 1,2 phase combined issues 76 pages).This instrument electric heating demonstration device only need be switched on 3 seconds, can allow the student see electric heating (heat in large-temperature range very, depending merely on vision can't perception, and this instrument is controlled at the appreciable scope of vision to the temperature of heat---heating wire is rubescent, it is invisible into as seen to become.)。And can light combustibles such as paper, cigarette, perfume (or spice).
3, J2439 electromagnet experimental apparatus, during experiment " direction of current changes, and the magnetic pole of electromagnet also changes thereupon ", the method that changes direction of current is that two leads of electromagnet are separated, connect again after the transposing, go to check the magnetic pole of electromagnet to change with needle, (, do not write down polarity last time if do not make notes because the bothersome time is long, when after having changed next time, having seen former reversing again, all may forget former polarity), the student also cannot see size of current and direction of current, and this instrument need only be stirred K
4, just can moment change direction of current, and can see that direction of current has changed by the direction of current pilot lamp, see that simultaneously a utmost point of the former sensing electromagnet of needle is ostracised, another utmost point is attracted, and can stir K repeatedly
4Experiment, intuitively interesting, can make the very fast understanding of student: " direction of current changes, and the magnetic pole of electromagnet also changes thereupon "; " direction of winding of electromagnet changes, and the magnetic pole of electromagnet also changes thereupon " also do not have this experimental apparatus, this instrument double-coil electromagnet and single-pole double-throw switch (SPDT) K at present
5Match, can change direction of winding, by external packing direction of winding index line indication direction of winding in moment.Effect is intuitively interesting.
4, the experimental apparatus that does not also have typing before " recoil " topic, in the teaching material be in pop can or plastic bottle bottom equidistant towards a direction with 4-6 holes of thick awl bundle, sling with line, pour water into, water can be from direction ejection of Kong Zhongchao, and jar will rotate to the direction opposite with water spraying direction, owing to change comparatively fast, the student is difficult to see clearly water spraying direction and direction of rotation, and only seeing around the pop can has a circle " water skirt ".It is opposite with model aircraft direction of motion that this instrument recoil demonstration device can make the student know that direction is incited in perception.
Three, become dry as dust into interesting.
J218 primary school acoustics experiment box and J2273 junior middle school acoustics calorifics demonstration box, though loudspeaker is arranged, because no sound source, can only go to contact loudspeaker wiring with battery, make loudspeaker send plodding " crash-crash-" sound, this instrument and loudspeaker match, cooperate sound-track engraving apparatus again, can make loudspeaker send clear and melodious melodized song and musical sound, how inquire again this sound of student produces, then experiment, observe small paper ball on the cone or polyfoam ball when the loudspeaker sounding how about, small paper ball or polyfoam ball can beat (vibration) are said by students' union when sounding.
Fig. 1 is the main frame schematic diagram, and all elements are assembled welding by this figure.Fig. 2 is annex one a magnetoelectricity demonstration device (plate).Fig. 3 is the hot demonstration device electrical schematic diagrams of annex two power.Fig. 4 is annex two front views.Fig. 5 is annex two vertical views.Fig. 6 is annex two side views.Fig. 7 is annex two chassis and cut-open view thereof.Fig. 8 is annex two bearings and bearing holder (housing, cover).Fig. 9 is annex two dead rings.Figure 10 is annex two beckets.Figure 11 is annex two bearing holder (housing, cover)s, dead ring, the bonding assembling synoptic diagram of becket.Figure 12 is annex two line style tube-type solid demonstrating expansion on heating and contraction on cooling device AA, A ｀ A ｀ cut-open view (aim at pointer and be attached on the lampshade fixed head, independently makes to paste on the fixed head by scale " 0 ".)。Figure 13 is annex two brushes.(chassis, vertical rod be insulating material in this way, and the brush body can all adopt conductor material to be made into integration, without plastics).Made by plastics, copper material, plastics represent that with the oblique line face copper product is represented with no oblique line face.Figure 14 is annex two vertical rods, following termination chassis, and upper end peace bearing holder (housing, cover), top peace coiled pipe fixed knot, two hole fixed brushes on three holes, lead is worn in next hole.Figure 15 is annex two armed levers (2).Figure 16 is annex two screw propellers (2), and 30 ° of-35 ° of angles (in the same direction) respectively and between the centre slice are reversed in the center pit both sides.Figure 17 is annex two electric heating demonstration device stators.Figure 18 is annex two model aircrafts (2, papery, plastics matter all can).Figure 19 is the electric heating demonstration device.Figure 20 is a host printed circuit board.Figure 21 is main frame direct supply rectifier fixed head and aluminium heat sink (40 * 40 * 1).Aluminium represents that with the oblique line face Figure 22 is a host panel.Figure 23 is host backplane and squab panel.Figure 24 is that main frame cover plate (last, left and right) Figure 25 is a fixedly angle bar (difference of the branch left and right sides, 2) of main frame cover plate.Figure 26 is a fixedly angle bar (difference of the branch left and right sides, 2) of host panel.Figure 27 is annex two incandescent lamp principle of luminosity demonstration device 12V5W " " shape bread bicycle shed lamp holders.Figure 28 is annex two coiled pipe fixed knots.Figure 29 is a host printed circuit board, and rectifier fixed head fixedly angle bar (2 pairs 4) Figure 30 is a main frame bar magnet fixed angles ferropexy frame.
Realize the best method of invention or utility model:
One, electromagnet experimental demonstration and magnetoelectricity demonstration
1, two leads of electromagnet is connect red, the black binding post of direct current output respectively, voltage-selected switch K
3Be threaded to 3,4.5, any shelves of 6V, turn on the power switch K
1, electromagnet and pin (or little iron nail) is approaching, electromagnet can hold pin (little iron nail), mentions power cutoff, pilot lamp goes out, pin (or little iron nail) all falls, experiment repeatedly, and the magnetic of description of test electromagnet is produced by electric current, there is electric current to pass through, electromagnet is magnetic, and no current passes through, electromagnet magnetic disappearance (nonmagnetic).
2, then do, turn on the power switch K
1, with K
3By 1.5,3,4.5,6V is by the shelves experiment, the pilot lamp that can find the indicator current size can send different brightness indications by the current of electromagnet size, the suction iron amount of electromagnet also can change, experimental middle school can be familiar with intuitively: by current of electromagnet big more (by force), the magnetic force of electromagnet also big more (by force), otherwise more little (weak).
3, then do, the close a certain end of electromagnet of needle, K
3Be threaded to the 6V shelves, turn on the power switch K
1As seen a certain utmost point of needle can point to electromagnet, and a pilot lamp of indicator current direction is bright, indication direction of current at this moment.Stir direction of current switch K
4, visible original needle one utmost point that points to electromagnet is ostracised, and another utmost point is attracted the sensing electromagnet, originally the pilot lamp of indicator current direction goes out, and the other direction pilot lamp is bright, indicates direction of current and changes, but the repeatable operation experiment, experimental middle school's life can be clear that; Direction of current changes, and the polarity of electromagnet also changes thereupon.
4, then do, stir direction of winding switch K
5, a utmost point of visible needle is ostracised, and another utmost point is attracted the sensing electromagnet, experiment repeatedly, the student by the electromagnet external packing the direction of winding index line and experiment in observed phenomenon, but visual understanding: change the direction of winding of electromagnet, the polarity of electromagnet also changes thereupon.
Match with annex one and can finish whole magnetoelectricity experiments and conductor, semiconductor, insulator experiment.Electric energy be can demonstrate and magnetic energy and luminous energy changed into.
Two, electric heating, incandescent lamp principle of luminosity lecture experiment.Main frame and annex two match, and annex two plugs are plugged in main frame exchange accessory power outlet, exchanging selector switch K
2Be threaded to 6V, K
6Be allocated to the electric heating shelves, visible electric heating demonstration device heating reddens, and can light cigarette, (ending to rubescent as not rubescent boosted voltage gradually).Experimental middle school's life is (3-4 second) perception electric heating (electric energy changes heat energy into) at short notice.Does then allow the student think earlier: the angle of heating wire continue how about to raise? with K
6Be allocated to lamp (replacing the heating wire experiment with filament), voltage-selected switch is allocated to 4.5V shelves, also progressively rising of shelves thus, until 12V, the student can recognize intuitively: incandescent lamp is filament red-hot and shinny (heat energy changes luminous energy into, electric energy changes luminous energy into).
Three, recoil demonstration
Annex two plugs are plugged in main frame exchange output, K
6Be allocated to the recoil shelves, open K
1Energized, the alternating voltage by-pass cock is allocated to the 6V shelves, the screw propeller rotation is incited gas backward and (is not incited gas backward as counter-rotating, can change diode wiring direction in the base), the model of an airplane is owing to have armed lever to haul to do circular motion (only to rotate and the model of an airplane does not move and adjusts brush contact dynamics as screw propeller, low as revolution speed of propeller, adjust K
2Gear).Can demonstrate electric energy and become mechanical energy, centrifugal force, centripetal force, the simulation earth are around sun running.
Four, solid demonstrating expansion on heating and contraction on cooling
Annex two plugs are plugged in main frame exchange accessory power outlet, K
6Be allocated to the shelves that expand with heat and contract with cold, K
2Be allocated to 7.5V or 9V shelves, turn on the power switch in the K1 energized 3 seconds, can see that pointer is progressively moved right by millimeter scale " 0 ", indicate the heating wire after expansion length of being heated, 3-4 power cutoff after second, heating wire cooling are toward retraction, and visible pointer is moving to " 0 " displacement gradually, can test repeatedly, the student can observe directly in experiment: the solid cubical expansion that is heated; The body of catching a cold contracts.Can demonstrate the contract demonstration of power demonstration device of J2259 solid.(note: what voltage did not add during experiment is too high, is advisable can see pen travel, as is heated to azarin fragile or reduction of service life).
Five, sound is that object vibration produces sound---vibration changes demonstration mutually.
1,4 one group series connection of J218 primary school acoustics experiment box 8 Ω loudspeakers, 4 groups of parallel connections (its impedance is still 8 Ω like this) then, totally 16, one group of 3 people can be for 48 student experimenting demonstrations.The student is under the suitable lead of teacher, be with interest, when observing loudspeaker and sending various sound, the small paper ball on its cone (polyfoam ball) is in bob (vibration), and the student can be familiar with in carefree classroom atmosphere: sound is produced by object vibration.
2, loudspeaker subtend vibrating membrane, the bead that as seen is hung in vibrating membrane central authorities when the loudspeaker sounding is in vibration; The student is perception intuitively: sound also can make object produce vibration.(sound, vibration change mutually), the effect of the eardrum of people's middle ear: be exactly that sound (sound wave) is become vibration.
3, can simulate ear is experiment how to hear sound.This machine of utilization sound equipment power amplifier function is represented eardrum with a loudspeaker, connects the audio frequency input, the commissarial brain sense of hearing of another loudspeaker brain cell, and lead, amplifirer are represented auditory nerve.When talking facing to the loudspeaker of representing eardrum and sending various sound, the effect that the cone of loudspeaker resembles eardrum produces vibration.Auditory nerve by lead and amplifirer representative is passed to brain, represents the auditory cell of brain, sound by loudspeaker, the sound that expression is heard.Sound change of tune vibration in this experiment, vibration change of voice sound, electric energy change of voice energy, acoustic energy power transformation energy.
Claims (5)
- Multifunctional experiment demonstrator setThe technical characterictic of multifunctional experiment demonstrator set is:1, main frame removes input power supply 220V/50HZ, output 0～12V/10A AC power, outside 0～6V/10A direct supply, also has level power amplification function behind the sound equipment, can export tone currents and the microphone prime enlarging function of rated power 75W, quick translation function of DC current direction and size of current, direction of current deixis.
- 2, electromagnet adopts two groups of different coil windings of direction of winding to form and shows inner actual direction of winding by red in the external packing, green line, matches with single-pole double-throw switch (SPDT), realizes changing fast the purpose of direction of winding.
- 3, pedestal rotation posture recoil demonstration device, utilize toy motors to make the power of the model of an airplane, utilize screw propeller to incite the gas generation reacting force promotion model of an airplane backward and move in the opposite direction, utilize the little bearing of friction force to make swivel mount, for keeping balance, adopt the bilateral symmetrical expression.The mode that adopts brush to conduct electricity is powered for the model of an airplane of motion.
- 4, the solid demonstration device that expands with heat and contract with cold; change traditional external spirit lamp and be heated to be directly generation heat in conductor of electricity; make the solid cubical expansion; under the effect of spring force, spur pen travel by pointer and do not make the heating wire bending; on scale, indicate the cubical expansion data by pointer; heating wire, pointer, spring and lead-in wire are installed in the glass tube, and the two ends lead-in wire plays the protection fixation with glass tube (burning sticking) adhesive seal.
- 5, the electric heating demonstration device is that the electric soldering iron filament winding about the 150W of one section 60～80 length is made spiral fashion, and two ends connect with lead, passes that the diplopore porcelain tube fixedly makes.More than five be the basic and main feature of multifunctional experiment demonstrator set, claimed is the method for making of above five kinds of masters, annex.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 00106357 CN1330351A (en) | 2000-06-15 | 2000-06-15 | Multifunctional experiment demonstrator set |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 00106357 CN1330351A (en) | 2000-06-15 | 2000-06-15 | Multifunctional experiment demonstrator set |
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| CN1330351A true CN1330351A (en) | 2002-01-09 |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103032798A (en) * | 2011-09-29 | 2013-04-10 | 上海美迪馨电子科技有限公司 | Light-emitting diode (LED) desk lamp |
| CN104064086A (en) * | 2014-06-25 | 2014-09-24 | 南宁市第二中学 | Moving-magnet-type loudspeaker for teaching |
| CN108305536A (en) * | 2018-03-11 | 2018-07-20 | 艾智玉 | A kind of Physics Classroom Teaching apparatus for demonstrating |
-
2000
- 2000-06-15 CN CN 00106357 patent/CN1330351A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103032798A (en) * | 2011-09-29 | 2013-04-10 | 上海美迪馨电子科技有限公司 | Light-emitting diode (LED) desk lamp |
| CN103032798B (en) * | 2011-09-29 | 2016-09-28 | 上海美迪馨电子科技有限公司 | A kind of LED desk lamp |
| CN104064086A (en) * | 2014-06-25 | 2014-09-24 | 南宁市第二中学 | Moving-magnet-type loudspeaker for teaching |
| CN108305536A (en) * | 2018-03-11 | 2018-07-20 | 艾智玉 | A kind of Physics Classroom Teaching apparatus for demonstrating |
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