CN202142217U - Hand-held thread standing wave demonstrating device possessing stroboscopic function - Google Patents
Hand-held thread standing wave demonstrating device possessing stroboscopic function Download PDFInfo
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- CN202142217U CN202142217U CN201120248400U CN201120248400U CN202142217U CN 202142217 U CN202142217 U CN 202142217U CN 201120248400 U CN201120248400 U CN 201120248400U CN 201120248400 U CN201120248400 U CN 201120248400U CN 202142217 U CN202142217 U CN 202142217U
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- standing wave
- electric torch
- led electric
- pwm circuit
- oval
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Abstract
The utility model relates to a hand-held thread standing wave demonstrating device possessing the stroboscopic function, and belongs to the teaching device field. The demonstrating device is composed of an LED electric torch, a vibrator, and a thread rope, and is provided with a frequency generator. An LED lamp is connected with an output terminal of the frequency generator, and the frequency generator outputs a pulse with the frequency being 3 to 50Hz and the duty ratio being 1%. The vibrator is composed of a strip-liked spring, a vibration motor fixed on the spring, and a PWM circuit. One end of the spring is fixed on the LED electric torch, and the other end is fixed with the thread rope. The PWM circuit outputs a 3000Hz square wave which is adjustable in duty ratio. The vibrator can also be designed in to an elliptical cam mode or an elliptical grooved pulley mode. The demonstrating device can generate the thread standing wave and make the thread standing wave move slowly or stop. Because of the adoption of the chargeable LED electric torch, the demonstrating device can be charged directly by a 220V power supply. The demonstrating device is energy saving and is free of maintenance. The size of the demonstrating device is similar to the electric torch, thus being easy to carry and operate.
Description
Technical field
The utility model belongs to instruments used for education, is specially a kind of instrument of demonstrating standing wave.
Background technology
Standing wave be in the stack of ripple the most simply, the most basic phenomenon., the phase of wave of the same amplitude of two row move toward one another, same frequency just forms standing wave when meeting.The phenomenon of standing wave and formation are the knowledge that requires the student to grasp in the physical basis teaching, and the forming process of understanding standing wave is the basis that the stack and the wave interference of ripple are learnt in the back.Though standing wave be in the stack of ripple the most simply, the most basic phenomenon; It also is suitable general phenomenon in the life; That but people's sense organ often is difficult to is complete, feel this phenomenon visually; Thereby people are not deep to the perceptual knowledge of standing wave, so for the student, in teaching, use standing wave demonstrator to be very important.The apparatus for demonstrating of standing wave has many kinds, and the use in the teaching is also quite general, like line Standing wave demonstration appearance, makes vibration source with loudspeaker or eccentric motor etc., makes the vibration of single line rope, forms standing wave.Because the frequency of the standing wave that forms like this is very fast; Can not observe with the naked eye the shape of standing wave transient state; Under one situation; Also need a special stroboscope shine standing wave, when the frequency of the frequency of stroboscopic and standing wave is consistent or approximate, just can see the state of " slow moving " cotton rope that perhaps " fixes ".In addition, also can demonstrate the process that standing wave forms, form demonstrator, the Standing wave demonstration that perhaps utilizes electronic curtain and software simulation to come out like the projection standing wave with simulated mode.But above these instruments all need more equipment, also need power supply, and it is not too convenient on the classroom, to use, and cost is higher.
Summary of the invention
In order to address the above problem, the utility model provides a kind of hand-held line Standing wave demonstration device that has the stroboscopic function with the electric torch repacking, can produce the line standing wave, also is a small-sized stroboscope, can the function of above-mentioned two kinds of standing wave demonstrators be united two into one.
The utility model has adopted following scheme:
Have the hand-held line Standing wave demonstration device of stroboscopic function, form by LED electric torch, oscillator, cotton rope.Be provided with frequency generator in the LED electric torch, its LED lamp connects the output of this frequency generator, and this frequency generator is made up of 555 chips, output frequency be 3～50Hz, dutycycle is 1% pulse; Said oscillator is made up of bar-spring sheet and the vibrating motor and the pwm circuit thereof that are fixed on the spring leaf; This spring leaf one end is fixed on the LED electric torch; The other end is fixed with said cotton rope, and this pwm circuit is made up of 555 chips, the 3000Hz square wave that output duty cycle is adjustable.
Also can, said oscillator is made up of oval cam, motor and pwm circuit thereof, wherein said oval cam is oval-shaped short column, circular catch is established at short column two, on the rotation axis of the motor that the symmetric points place, center of oval cam is fixed on; Said pwm circuit is made up of 555 chips, the 3000Hz square wave that output duty cycle is adjustable; Said motor is arranged on LED electric torch madial wall, outside its rotation axis stretching wall; One on said cotton rope is fixed on the LED electric torch, and rides on the oval cam.
All right, said oscillator is made up of oval sheave, motor and pwm circuit thereof, and wherein oval sheave is the cylinder that is connected with motor rotation axis, on cylindrical side, is provided with the oval-shaped groove of a circle; Said pwm circuit is made up of 555 chips, the 3000Hz square wave that output duty cycle is adjustable; Said motor is arranged on LED electric torch madial wall, outside its rotation axis stretching wall; One on said cotton rope is fixed on the LED electric torch, and is embedded in the groove of oval sheave.
Wherein, said pwm circuit can be replaced by potentiometer.
Above-mentioned LED electric torch adopts chargeable LED electric torch, can use～220V directly charges.
As a kind of preferred, above-mentioned cotton rope adopts the rubber band rope.
The major advantage of the utility model is: being used as the oscillator that produces standing wave can regulating frequency, conveniently produces stable standing wave, and has the stroboscopic function line standing wave " slowly motion " perhaps " is fixed ", is convenient to clear observation standing wave motion state.This instrument utilizes existing LED electric torch, in its feed circuit, adds two FM circuits, is respectively applied for speed of regulating motor and the frequency that LED lights, and just can form the oscillator and the strobe of scalable frequency, and is simple; And the LED electric torch adopts chargeable LED electric torch, can directly use～the 220V charging, and is energy-conservation, non-maintaining; The size of instrument such as electric torch are easy to carry and operate.
Description of drawings
Fig. 1 has the structural drawing of the hand-held line Standing wave demonstration device embodiment 1 of stroboscopic function for the utility model;
Fig. 2 has the structural drawing of the hand-held line Standing wave demonstration device embodiment 2 of stroboscopic function for the utility model;
Fig. 3 has the structural drawing of the hand-held line Standing wave demonstration device embodiment 3 of stroboscopic function for the utility model;
Fig. 4 is a middle oval cam structural drawing embodiment illustrated in fig. 2;
Fig. 5 is a middle elliptical slot rolling hitch composition embodiment illustrated in fig. 3;
Fig. 6 has the circuit diagram of pwm circuit among the hand-held line Standing wave demonstration device embodiment 1-embodiment 3 of stroboscopic function for the utility model;
Fig. 7 has the circuit diagram of the hand-held line Standing wave demonstration device embodiment 1-embodiment 3 medium frequency generator circuits of stroboscopic function for the utility model.
Among the figure: 1, catch, 2, oval-shaped short column, 3, axis hole, 4, groove, 5, cylinder.
Embodiment
Elaborate below in conjunction with Fig. 1-7 pair the utility model.
The output of frequency generator circuit connects the LED lamp in the LED electric torch, as strobe.The frequency requirement of strobe is adjustable between 3～50Hz, and dutycycle is below 4%.Frequency generator circuit such as Fig. 7 also are made up of 555 chips, and in order to meet the demands, the potentiometer R1 among the figure is 5K, and potentiometer R2 is 500K, and capacitor C 1 is 1 μ F, and capacitor C 2 is 10nF.Use strobe that standing wave " is fixed " or " slowly motion ".
The connection switch of pwm circuit and frequency generator circuit can be used the switch of LED electric torch itself, and the LED flashlight switch is three position switch, is used separately as the pass, connects pwm circuit, connects pwm circuit and frequency generator circuit.
More than pwm circuit among three embodiment also can replace with potentiometer, make circuit reduction, but can lose some power.
Claims (6)
1. the hand-held line Standing wave demonstration device that has the stroboscopic function; Form by LED electric torch, oscillator, cotton rope; It is characterized in that: be provided with frequency generator in the LED electric torch; Its LED lamp connects the output of this frequency generator, and this frequency generator is made up of 555 chips, output frequency be 3～50Hz, dutycycle is 1% pulse; Said oscillator is made up of bar-spring sheet and the vibrating motor and the pwm circuit thereof that are fixed on the spring leaf; This spring leaf one end is fixed on the LED electric torch; The other end is fixed with said cotton rope, and this pwm circuit is made up of 555 chips, the 3000Hz square wave that output duty cycle is adjustable.
2. the hand-held line Standing wave demonstration device that has the stroboscopic function as claimed in claim 1; It is characterized in that: said oscillator is made up of oval cam, motor and pwm circuit thereof; Wherein said oval cam is oval-shaped short column; Circular catch is established at short column two, on the rotation axis of the motor that the symmetric points place, center of oval cam is fixed on; Said pwm circuit is made up of 555 chips, the 3000Hz square wave that output duty cycle is adjustable; Said motor is arranged on LED electric torch madial wall, outside its rotation axis stretching wall; One on said cotton rope is fixed on the LED electric torch, and rides on the oval cam.
3. the hand-held line Standing wave demonstration device that has the stroboscopic function as claimed in claim 1; It is characterized in that; Said oscillator is made up of oval sheave, motor and pwm circuit thereof, and wherein oval sheave is the cylinder that is connected with motor rotation axis, on cylindrical side, is provided with the oval-shaped groove of a circle; Said pwm circuit is made up of 555 chips, the 3000Hz square wave that output duty cycle is adjustable; Said motor is arranged on LED electric torch madial wall, outside its rotation axis stretching wall; One on said cotton rope is fixed on the LED electric torch, and is embedded in the groove of oval sheave.
4. like each described hand-held line Standing wave demonstration device that has the stroboscopic function among the claim 1-3, it is characterized in that said pwm circuit is replaced by potentiometer.
5. like each described hand-held line Standing wave demonstration device that has the stroboscopic function among the claim 1-3, it is characterized in that said LED electric torch is chargeable LED electric torch.
6. like each described hand-held line Standing wave demonstration device that has the stroboscopic function among the claim 1-3, it is characterized in that said cotton rope is the rubber band rope.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201120248400U CN202142217U (en) | 2011-07-14 | 2011-07-14 | Hand-held thread standing wave demonstrating device possessing stroboscopic function |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201120248400U CN202142217U (en) | 2011-07-14 | 2011-07-14 | Hand-held thread standing wave demonstrating device possessing stroboscopic function |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202142217U true CN202142217U (en) | 2012-02-08 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201120248400U Expired - Fee Related CN202142217U (en) | 2011-07-14 | 2011-07-14 | Hand-held thread standing wave demonstrating device possessing stroboscopic function |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202142217U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103559815A (en) * | 2013-10-23 | 2014-02-05 | 国家电网公司 | Round standing wave generator |
-
2011
- 2011-07-14 CN CN201120248400U patent/CN202142217U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103559815A (en) * | 2013-10-23 | 2014-02-05 | 国家电网公司 | Round standing wave generator |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20120208 Termination date: 20120714 |