Abstract:
An electronic lighting device and a method for manufacturing the same are disclosed. The electronic lighting device may comprise a core, which may comprises an enclosure, a light-emitting element, a flame sheet and a swing mechanism. The flame sheet is movably supported or suspended on the enclosure, and may comprise an upper sheet which is of a flame-like shape. The upper sheet is configured to expose above the top of the enclosure. The light-emitting element may be installed on the enclosure. A light outgoing direction of the light-emitting element may be intersected with the surface of the upper sheet so that the light of the light-emitting element is projected on the surface of the upper sheet. The swing mechanism is disposed beneath the flame sheet and can apply a force on the flame sheet to actuate the flame sheet to sway or swing. By the present application, a visual experience of true fire can be achieved and an interestedness and appreciation can be improved.

Description:
CROSS REFERENCE TO RELATED APPLICATIONS 
       [0001]    The present application is a continuation of U.S. patent application Ser. No. 14/925,899, filed Oct. 28, 2015, entitled “Electronic Lighting Device and Method for Manufacturing Same,” which is a continuation of U.S. patent application Ser. No. 14/588,507, filed Jan. 2, 2015, entitled “Electronic Lighting Device and Method for Manufacturing Same,” which is a continuation of U.S. patent application Ser. No. 14/161,143, filed Jan. 22, 2014, now U.S. Pat. No. 8,926,137, entitled “Electronic Lighting Device and Method for Manufacturing Same,” which is a continuation of U.S. patent application Ser. No. 13/325,754, filed Dec. 14, 2011, now U.S. Pat. No. 8,789,986, entitled “Electronic Lighting Device and Method for Manufacturing Same,” which is a continuation-in-part of International PCT Patent Application No. PCT/CN2011/076449, filed Jun. 27, 2011, which claims priority to Chinese Patent Application No. 201010211402.8, filed Jun. 28, 2010, each of which is hereby incorporated by reference in its entirety. 
     
    
     TECHNICAL FIELD 
       [0002]    The present application relates to an electronic lighting device. 
       BACKGROUND 
       [0003]    In our daily life, various electronic lighting devices are widely applied to toys, home decoration products and gifts. For instance, candles, kerosene lamps and so on are originally used as lamps for illumination. However, people are no longer concerned about the illumination function of candles and kerosene lamps as electrical light sources are used commonly. The candles and kerosene lamps are thus used for interestedness or appreciation rather than illumination. Recently, various electronic lighting devices, such as electronic flashing candles, electronic candles, simulated candles and simulated kerosene lamps and the like, emerge as required. Lighting parts of such electronic lighting devices try to simulate lighting patterns of candles or kerosene lamps, namely, to simulate flashing and flickering flames of candles or kerosene lamps. However, compared with the flames of candles or kerosene lamps, the lighting parts of the electronic lighting devices are quite different and have not enough realistic visual effect. 
         [0004]    For instance, a type of electronic candle is disclosed in a Chinese application No. 200520035772.5, titled “Electronic Simulated Flashing Candle”. The electronic candle comprises a flame shell shaped as true flames, LED elements disposed in the flame shell, and a control circuit. The control circuit controls lighting sequences of the LED elements such that the LED elements flash on and off. As a result, a visual experience of winkling and jumping light is given by the electronic candle and thus the interestedness or appreciation of the electronic candle is enhanced. 
       SUMMARY 
       [0005]    An objective of the present application is to provide an electronic lighting device for simulating true fire and a method for manufacturing the same to simulate true fire with an enhanced visual experience. 
         [0006]    According to an aspect of the present application, an electronic lighting device comprising a core is provided. The core may comprise: an enclosure provided with a through hole on a top thereof; a flame sheet movably supported or suspended on the enclosure, wherein the flame sheet comprises an upper sheet which is of a flame-like shape, and the upper sheet is configured to expose above the top of the enclosure through the through hole of the enclosure; a light-emitting element installed on a sidewall of the enclosure such that an outgoing direction of a light from the light-emitting element is inclined upward and passing through the through hole of the enclosure, wherein the outgoing direction is intersected with a surface of the upper sheet, so that the light from the light-emitting element is projected on the surface of the upper sheet; and a swing mechanism disposed beneath the flame sheet, wherein the swing mechanism is configured to apply a force on the flame sheet to actuate the flame sheet to sway or swing. 
         [0007]    According to another aspect of the present application, a method for manufacturing an electronic lighting device is provided. The method may comprises: suspending a flame sheet on an enclosure, wherein the flame sheet comprises a upper sheet which is of a flame-like shape and exposed above a top of the enclosure; installing a light-emitting element on a sidewall of the enclosure such that an outgoing direction of a light from the light-emitting element is inclined upward and passing through a through hole of the enclosure to be intersected with a surface of the upper sheet, so that the light from the light-emitting element is projected on the surface of the upper sheet; and disposing a swing mechanism beneath the flame sheet, wherein the swing mechanism is configured to apply a force on the flame sheet to actuate the flame sheet to sway or swing. 
         [0008]    In the present application, by the cooperation of the flame sheet with the light projected thereon, the flame sheet may sway or swing under the action of its own gravity and the swing mechanism. The light given off by the light-emitting element is projected on the flame sheet and looks like a true flickering flame so that the flame simulated by the lighting device is closer to the wick flame of the traditional lighting device such as a candle, a kerosene lamp and the like. In the case where the device according to the present application is applied to electronic products, such as electronic candles or simulated kerosene lamps and the like, it further improves the visual experience of the electronic products and provides the electronic products with enhanced interestedness and appreciation. 
         [0009]    In some embodiments, since the swing mechanism in the device of the present application uses a magnetic mechanism, the flame sheet maintains to sway randomly or disorderly in use, so that the light projected on the flame sheet keeps flickering and looks like a true flame. 
         [0010]    In some embodiments, in the device of the present application, the light given off by the light-emitting element has an emission angle within a specific range, so that the light is assured to be projected on the flame sheet, and thus the visual effect of simulating true fire is assured. 
         [0011]    In some embodiments, the shell is simulated in to a traditional candle in shape, so that the device of the present application is closer to the traditional candle in visual effect. 
     
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         [0012]      FIG. 1  is a schematic view showing an appearance of an electronic candle according to a first embodiment of the present application; 
           [0013]      FIG. 2  is a cross-sectional view showing a structure of the electronic candle according to the first embodiment of the present application; 
           [0014]      FIG. 3  is an exposed view schematically showing the structure of the electronic candle according to the first embodiment of the present application; 
           [0015]      FIG. 4  is a schematic view showing a structure of a core of the electronic candle according to the first embodiment of the present application; 
           [0016]      FIG. 5  is an exposed view schematically showing the structure of the core of the electronic candle according to the first embodiment of the present application; 
           [0017]      FIG. 6  is a schematic view showing a structure of a flame sheet of the electronic candle according to the first embodiment of the present application; 
           [0018]      FIG. 7  is a schematic diagram showing a circuit part of the electronic candle according to the first embodiment of the present application; 
           [0019]      FIG. 8  is a cross-sectional view showing a structure of an electronic candle according to a second embodiment of the present application; 
           [0020]      FIG. 9  is an exposed view schematically showing a structure of a core of an electronic candle according to a third embodiment of the present application; 
           [0021]      FIG. 10  is a schematic diagram of a circuit part of the electronic candle according to the third embodiment of the present application; 
           [0022]      FIG. 11  is an exposed view schematically showing a structure of a core of an electronic candle according to a fourth embodiment of the present application; 
           [0023]      FIG. 12  is an exposed view schematically showing a structure of a core of an electronic candle according to a fifth embodiment of the present application; 
           [0024]      FIG. 13  is an exposed view schematically showing a structure of a core of an electronic candle according to a sixth embodiment of the present application; and 
           [0025]      FIG. 14  is a schematic view showing a structure of a flame sheet of the electronic candle according to the seventh embodiment of the present application. 
       
    
    
     DETAILED DESCRIPTION 
       [0026]    Hereinafter, a detailed description of the present application will be given by specific embodiments and with reference to the appended drawings. 
       Embodiment 1 
       [0027]    In particular, the present application provides an electronic candle, with reference to  FIGS. 1 to 5 .  FIG. 1  is a schematic view showing the appearance of the electronic candle according to the first embodiment. The electronic candle, which is shaped as a true candle, comprises: a shell  1 , a casing  2  sleeved within the shell  1 , a core  3  and a base  4  installed within the casing  2 . The casing  2  is provided with a through hole at the top-center. A flame sheet is arranged in the through hole. A portion of the flame sheet which protrudes outsides through the through hole is shaped as a flame of a burning candle. The light emitted from a light-emitting element which is disposed on the core  3  is projected, at an angle, onto the portion of the flame sheet which protrudes outsides through the through hole. Further, the flame sheet may sway freely under the action of natural winds or a swing mechanism arranged within the core  3 . In this way, the flame simulated by the electronic candle, when viewed from a distance, flickers like that of a true candle, as if it is a perfectly realistic flame, and thus can be scarcely distinguished from the true one. 
         [0028]    As shown in  FIGS. 2 to 5 , the core  3  comprises an enclosure, a flame sheet  31 , a LED light  33  and a swing mechanism. The enclosure comprises left and right caps  38  and  38 ′ having symmetrical shapes with each other. A cylindrical cavity is formed when the left and right caps  38  and  38 ′ are arranged to engage with each other. Each of the left and right caps  38  and  38 ′ has a semicircular notch on the top, such that a circular opening  380  is formed on the top of the cavity by the semicircular notches when the left and right caps  38  and  38 ′ are arranged to engage with each other. The left and right caps  38  and  38 ′ have respective left and right notches  381  and  381 ′ on the upper portions of their sidewalls. The left and right notches  381  and  381 ′ are concaved inwardly and inclined at a certain angle with respect to the sidewalls in such a way that an installation location for the LED light, which inclines toward and communicates with the opening  380 , is formed by the left and right notches  381  and  381 ′ when the left and right caps  38  and  38 ′ are arranged to engage with each other. The LED light  33  is then installed at this installation location such that an angle between a longitudinal central axis of the LED light  33  and that of the cavity is about 35 degree. Moreover, the LED light  33  may be a LED element emitting concentrated light with a relatively narrow emission angle (7-10 degree). Further, combined with an appropriate area of an upper sheet  311  of the flame sheet  31 , it can be assured that light emitted from the LED light  33  is maintained to be projected onto the surface of the flame sheet  31 . As a result, light beams are increased in brightness and form an elliptical light spot on the surface of the flame sheet  31 , so that the flame sheet  31  looks more like a flame of a true candle in shape. 
         [0029]    With reference to  FIG. 6 , the flame sheet  31  is of sheet type, and provided with a through hole  310  at the middle part. The flame sheet  31  is divided, by the through hole  310 , into a upper sheet  311  shaped as a flame of a burning candle and a lower sheet  312 . The lower sheet  312  has a counterweight slightly heavier than that of the upper sheet  311 , so that the flame sheet  31  is vertically suspended in a free state (under the action of its own gravity without any external force). A supporting rod  32  passes through the through hole  310  and spans across the opening  380  of the core&#39;s cavity. The supporting rod  32  is V-shaped and depressed slightly at the middle so that the flame sheet  31  is suspended steadily at the lowest point of the supporting rod  32  since the lower sheet  312  has a counterweight slightly heavier than that of the upper sheet  311 . It is easier for the flame sheet suspended vertically in a free state (under the action of its own gravity without any external force) to sway randomly under the action of an external force. In this way, the supporting rod  32  spanning across the opening  380  of the core&#39;s cavity may enable the flame sheet  31  to sway randomly under the action of an external force, such as natural winds. However, the supporting rod  32  may maintain a relatively fixed position relationship between the upper sheet  311  of the flame sheet  31  and the light outgoing direction of the LED light  33  such that the light from the LED light  33  can be projected onto the surface of the upper sheet  311  of the flame sheet  31 . Since the flame sheet  31  is manufactured by a semitransparent material, a portion of the light can emerge from the back of the flame sheet  31  when the light is projected onto the flame sheet  31 . In order to improve the effect of simulating a true candle&#39;s flame, a wire is embedded in the flame sheet  31  at the bottom of the upper sheet  311  to simulate a candlewick. In the case where the wire is irradiated by the light of the LED light  33  projected on the upper sheet  311 , as if there is a candlewick within a flame, such that the flame sheet  31  is more like the flame of a true burning candle in visual effect. In addition, since the supporting rod  32  is irradiated by the LED light  33 , a shadow of the supporting rod  32  is formed on the surface of the upper sheet of the flame sheet  31  and may also look like the candlewick. 
         [0030]    The tubular shell  1  is manufactured by a transparent or semitransparent material, such as PVC. The shell  1  comprises a tubular sidewall and a diaphragm plate  10  intersected with the tubular sidewall. A through hole is provided at the middle of the diaphragm plate  10 , from which the upper sheet  311  of the flame sheet  31  protrudes outsides. In order to simulate irregular wax melting when a candle is burning, a portion of the shell&#39;s sidewall above the diaphragm plate  10  is formed to have an irregular end face. For example, the sidewall may be lower in front and higher behind. The surfaces of the shell&#39;s sidewall and the diaphragm plate  10  are coated with candle wax, such that the electronic candle looks more like a true candle. The upper sheet  311  of the flame sheet  31  protrudes outsides through the through hole of the diaphragm plate  10 , with its front surface (the surface projected by the light) facing a lower point of the sidewall and its back surface obscured by a higher sidewall of the shell. In this way, a user is guided to dispose the electronic candle at a preferable angle to appreciate the “candle light”, that is to say, the electronic candle is viewed from the front surface of the upper sheet  311  of the flame sheet  31  and from the lower point of the sidewall. Accordingly, the effect for simulating a true candle by the electronic candle according to the first embodiment can be improved. 
         [0031]    In order to assure the effect of swaying of the flame sheet, the core is provided with a swing mechanism which maintains to act on the flame sheet directly or indirectly with a force such that the flame sheet maintains to sway or swing. As shown in  FIGS. 4 and 5 , the swing mechanism in the embodiment uses a magnetic mechanism comprising a set of magnets  39 , a linkage sheet  35 , a linkage rod  34  and a coil  37 . The set of magnets  39  comprises a first magnet, a second magnet and a third magnet. The linkage rod  34  is movably threaded through the linkage sheet  35 , and arranged to span across the core&#39;s cavity. The linkage rod  34  is V-shaped, and depressed slightly at the middle so that the linkage sheet  35  is positioned at the lowest point at the middle of the linkage rod  34 . The linkage sheet  35  may be suspended freely in the core&#39;s cavity without any external force. The second and third magnets are adhered to or embedded into the upper and lower ends of the linkage sheet  35 , respectively. The first magnet is adhered to or embedded into the lower end of the flame sheet  31 . A magnetic pole of the first magnet facing the second magnet has a polarity opposite or same to that of a magnetic pole of the second magnet at the upper end of the linkage sheet  35  facing the first magnet, that is to say, they may attract or repel each other. The coil  37  is fastened onto a PCB subboard through a snap ring  36 , and disposed beneath the lower end of the linkage sheet  35  so as to be opposite to the third magnet at the lower end of the linkage sheet  35 . 
         [0032]    The operation principle on the swaying or swinging of the flame sheet  31  is illustrated below. Firstly, an oscillation is output through a control circuit. When powered on, the coil  37  then produces a magnetic field which is opposite to the polarity of the magnet pole of the third magnet at the lower end of the linkage sheet  35  facing the coil so that the coil  37  and the third magnet at the lower end of the linkage sheet  35  repel each other. As a result, the linkage sheet  35  sways toward one side. Moreover, since the second magnet at the upper end of the linkage sheet  35  and the first magnet at the lower end of the flame sheet  31  attract or repel each other, the flame sheet  31  sways. When the coil  37  is powered off, the flame sheet  31  freely falls down under the action of its own gravity, and continues to sway in an opposite direction under an inertia potential energy until the coil  37  is powered on again. Then the inertial motion of the flame sheet  31  is changed by the magnetic force of the coil  37  via the linkage sheet  35 , and a next sway cycle begins. 
         [0033]    As shown in  FIGS. 3 and 4 , the base  4  comprises a battery tray  41 , a battery cover  42 , a PCB mainboard  43  and pieces of battery shrapnel  44 . The pieces of battery shrapnel  44  are installed on the battery tray  41  to form a battery chamber for accommodating batteries  45 . The PCB mainboard  43  is installed on the battery tray  41  and arranged at one side of the battery chamber. The control circuit and a power switch are arranged on the PCB mainboard  43 . The PCB mainboard  43  is electrically connected, via wires, with the LED light  33 , the PCB subboard installed with the coil  37 , and the pieces of batter shrapnel. The battery cover  42  is arranged at the bottom of the battery tray  41  and can be removed to enable the displacement of the batteries in the battery chamber. The core  3  is installed on the base  4 , wherein the PCB subboard installed with the coil  37  is electrically connected with the PCB mainboard  43 . The circumference of the battery stray  41  and the bottom of the casing  2  may be snapped together, or may be threaded with each other through a bolt. The casing  2  is a hollow cylinder, the external diameter of which is equal to or slightly larger than the internal diameter of the shell  1  so as to be tightly fitted into the shell  1 . The casing  2  is provided with a through hole on the top, which is used for mating with the core  3 . When the core  3  is received within the casing  2 , the upper sheet  311  of the flame sheet  31  is exposed out of the casing  2  through the casing&#39;s through hole. 
         [0034]      FIG. 7  is a circuit schematic diagram of the embodiment. The operation principle of the electronic candle according to the embodiment is illustrated below with reference to  FIG. 7 . 
         [0035]    In the power source part, the energy provided by the batteries is transferred, via a switch SW 1 , to an input pin of a boost converter U 1 , then into a boost circuit consisting of components such as a fifth capacitor C 5 , a second inductor L 2 , the boost converter U 1 , a third capacitor C 3  and an eighth resistor R 8 . A stable voltage of 3.3V is then output from a fifth pin of the boost converter U 1  to be supplied to a microprocessor U 2 , a LED light LED 1  (expressed as the LED light  33  in the structure described above, using a warm white light similar to true fire in color) and a coil L 1 . 
         [0036]    In the case where the switch SW 1  is closed such that the circuit is powered by the power source part, the microprocessor U 2  starts to work upon receiving a 3.3-volt voltage. When a voltage at a fifth pin (PB 1 ) of the microprocessor U 2  is above 1.82-volt, the microprocessor U 2  controls an eighth pin (PWM/PCO) to output a square wave pulse of 40 ms on and  630  off. A MOS transistor Q 1  and the coil L 1  are controlled through the square wave pulse to oscillate so as to produce a magnetic field. In the case that the magnetic field produced by the magnet at the lower end of the linkage sheet  35  is the same as that produced by the coil (both are N poles or S poles), the coil repels the magnet. The magnet then brings the linkage sheet  35  to sway toward left or right. Further, in the case that the magnetic field produced by the magnet at the upper end of the linkage sheet  35  is opposite to that produced by the magnet at the lower end of the flame sheet  31 , the linkage  35  drives the flame sheet  31  to sway toward right or left since the linkage sheet  35  and the flame sheet  31  are arranged to be a distance from each other. Meanwhile, the microprocessor U 2  controls a third pin (PB 3 ) to output a high level so as to supply about a 0.6-volt voltage to the base of a triode Q 2  via a resistor R 10 . Once the triode Q 2  is turned on, the LED light LED 1  is lighted. Then the light is projected onto the flame sheet at an angle of 35 degree. Under the action of the coil, the flame sheet, as viewed from a distance, is very similar to that of a burning candle. The optimum viewing distance is farther than 1 m from the electronic candle, the viewing angle being smaller than 120 degree. 
         [0037]    The work of circuit in the case where the switch is switched such that the circuit is controlled by a timer and a first pin (PA 3 ) of the microprocessor U 2  is at a low level is illustrated below. On one hand, the microprocessor U 2  controls the eighth pin (PWM/PCO) to output a square wave pulse of 40 ins on and 630 ins off after halting for 500 ms. The MOS transistor Q 1  and the coil are controlled through the square wave pulse to oscillate so as to produce a magnetic field. In the case that the magnetic field produced by the magnet at the lower end of the linkage sheet  35  is the same as that produced by the coil (both are N poles or S poles), the coil repels the magnet. The magnet then brings the linkage sheet  35  to sway toward left or right. Further, in the case that the magnet at the upper end of the linkage sheet  35  produce a magnetic field which is opposite to that produced by the magnet at the lower end of the flame sheet  31 , the linkage sheet  35  drives the flame sheet  31  to sway toward right or left since the linkage sheet  35  and the flame sheet  31  are arranged to be a distance from each other. Meanwhile, the microprocessor U 2  controls the third pin PB 3  to output a high level after halting for 500 ins (that is to say, the LED light LED 1  blinks for once) so as to apply about a 0.6-volt voltage to the base of the triode Q 2  via the tenth resistor R 10 . Once the triode Q 2  is turned on, the LED light LED 1  is lighted. On the other hand, an oscillation circuit, which consists of a crystal oscillator X 1 , a first capacitor C 1  and a second capacitor C 2 , provides standard clock information to the microprocessor U 2 . The timer of the microprocessor U 2  starts timing upon the LED light LED 1  blinks. After 5 hours, the microprocessor U 2  will controls the eighth pin (PWM/PCO) and the third pin (PB 3 ) to output a low level, so that the flame sheet stops swaying and the LED light LED 1  goes out. After next 19 hours, the microprocessor U 2  controls the eighth pin (PWM/PCO) to output a square wave of 40 ins on and 630 ins off, and the PB 3  to output a high level, so that the flame sheet starts to sway and the LED light LED 1  is lighted. In view of the above, the total time of a cycle is 24 hours. The circuit can circularly work in this way, until the batteries exhaust or the switch is switched into other states. 
         [0038]    When the battery voltage is below 1.62 volt, the LED light will go out no matter that the switch is switched such that the circuit is powered by the power source part or controlled by a timer. Meanwhile, the flame sheet stops swaying, and the control circuit goes to a sleep state. The circuit restores to work until the batteries are replaced with new ones. 
         [0039]    When the switch is opened, the boost converter U 1  and the microprocessor U 2  stop working since they are not powered by the batteries. As a result, the LED light will go out, meanwhile, the flame sheet  31  stops swaying. 
       Embodiment 2 
       [0040]    With reference to  FIG. 8 , the swing mechanism according to the first embodiment is simplified according to the second embodiment. The linkage sheet  35  and components attached thereto, such as the linkage sheet  34  and two magnets at both ends thereof, are omitted. Thus, the coil  37  is disposed adjacent to the lower end of the flame sheet  31 . In the case that the coil  37  produces a magnetic field which is opposite to that produced by the magnet at the lower end of the flame sheet  31 , the coil  37  and the flame sheet  31  repel each other so as to keep the flame sheet  31  swaying. 
       Embodiment 3 
       [0041]    In this embodiment, the swing mechanism in the core  3  according to the first embodiment is replaced with a swing mechanism according the third embodiment. With reference to  FIG. 9 , the swing mechanism according to the third embodiment comprises a hanging rope  301 , a swing piece  302 , a rotary block  303 , a motor fixed block  304  and a motor  305 . The upper end of the hanging rope  301  is hanged to the lower end of the flame sheet  31 , and the lower end of the hanging rope  301  is connected with the swing piece  302 . The motor  305  is fixed within the core&#39;s enclosure by the motor fixed block  304 . The rotary block  303  is fixed to the output shaft of the motor  305 . In a natural state (under the action of gravity, without the action of any external force), the swing piece  302  is, depending on its own gravity, hanged to the hanging rope  301  and then the lower end of the swing piece  302  contacts with the rotary block  303 . When the motor  305  is actuated, the rotary block  303  collides with the swing piece  302  continually. As a result, the swing piece  302  sways continually, which makes the flame sheet  31  sway disorderly. 
         [0042]    With reference to  FIG. 10 , a circuit schematic diagram according to the embodiment is shown. The operation of the swing mechanism is performed through controlling the rotation of the motor M 1  with the eighth pin of the microprocessor U 2 . 
       Embodiment 4 
       [0043]    In the fourth embodiment, the swing mechanism in the core  3  according to the first embodiment is replaced with a swing mechanism described below. With reference to  FIG. 11 , the swing mechanism according to the forth embodiment comprises a linkage rod  401 , a rotary block  402 , a motor fixed block  403  and a motor  404 . The middle part of the flame sheet  31  is provided with a slot, in which the upper end of the linkage rod  401  is stuck. The bottom end of the linkage rod  401  contacts with the outer wall of the rotary block  402 . The rotary block  402  has an irregular height, and is provide with a pan-like cavity at the middle part. Moreover, the sidewall of the pan-like cavity is provided with a tab  4021 . The lower end of the flame sheet  31  is stretched into the pan-like cavity. In a natural state, the tab  4021  contacts with the lower end of the flame sheet  31 . The motor  404  is fixed within the enclosure of the core by the motor fixed block  403 . The rotary block  402  is fixedly connected to an output shaft of the motor  404 . When the motor  404  is actuated and thus the rotary block  402  is forced to rotate, the outer wall of the rotary block  402  will continually collides with the bottom end of the linkage rod  401 . As a result, the tab  4021  will continually (or intermittently) collides with the lower end of the flame sheet  31 , which makes the flame sheet  31  sway or swing disorderly. 
       Embodiment 5 
       [0044]    In the fifth embodiment, the swing mechanism in the core  3  according to the first embodiment is replaced with a swing mechanism described below. The swing mechanism according to the fifth embodiment comprises a connecting piece  501 , a rotary block  502 , a motor fixed block  503  and a motor  504 . The lower end of the flame sheet  31  is provided with a snap-on piece  313 , which can be snapped into a receiving piece  5010  of the connecting piece  501 . The connecting piece  501  is L-shaped. An end of the connecting piece  501  far away from the receiving piece  5010  is provided with a snap-on piece  5011 , which can be snapped into a receiving piece  5020  on the rotary block  502 . The motor  504  is fixed within the enclosure of the core by the motor fixed block  503 . The rotary block  502  is fixedly connected with an output shaft of the motor  504 , When the motor  504  is actuated, the rotary block  502  brings the connecting piece  501  to rotate. The connecting piece  501  in turn brings the flame sheet  31  to sway. 
       Embodiment 6 
       [0045]    In the sixth embodiment, the swing mechanism in the core  3  according to the first embodiment is replaced with a fan mechanism described below. With reference to  FIG. 13 , a fan is fixed within the enclosure of the core at the bottom of the cavity of the core. The fan comprises a wind wheel  601 , a motor fixed block  602  and a motor  603 . The air outlet direction of the wind wheel  601  is upward. The lower end of the flame sheet  31  is folded at an angle so as to form a baffle  314  which has a surface facing the air outlet direction of wind wheel  601 . When the fan is activated, the surface of the baffle  314  of the flame sheet  31  is oriented to be upwind such that the flame sheet  31  continually sways under the action of the wind force, 
       Embodiment 7 
       [0046]    As shown in  FIG. 14 , the electronic candle according to the seventh embodiment is the same as that of the first embodiment, except for the upper sheet of the flame sheet. The upper sheet according to the seventh embodiment is slightly curved, which is concaved from one side. Flanks  3110  are provided at both sides of the concaved portion. The flanks  3110  and the concaved portion together form a depression onto which the light of the light-emitting element is projected. When the light of the light-emitting element is projected on the depression, a light spot is formed on the projected surface that is recessed with a certain depth rather than flat or curved. It seems that the depression is full of light. Further, when the flame sheet sways or swings disorderly, the light spot simulating a flame produces a stereovision effect. 
         [0047]    In view of the above embodiments, all of the electronic candles can be powered by rechargeable batteries. In addition, a charge control circuit may be arranged on the PCB mainboard of the base, such that the electronic candle of the application is rechargeable using a Plug-and-socket charger or a charge seat. 
         [0048]    The present application is further described in detail with reference to above specific embodiments, however, may be carried out by other embodiments than those set forth herein. Those skilled in the art will appreciate that all simple deduces or replacements can also be made without departing from the conception of the application, and are deemed to be embraced in the scope of the present application defined by the appended claims.