JP5573203B2 - Light emitting element driving device and portable device - Google Patents

Description

  The present invention relates to a light emitting element driving device including a light emitting element, a driving means for driving the light emitting element, a power storage element capable of storing electricity, and a battery power source capable of supplying power to the driving means and the power storage element. The present invention relates to a portable device including an element driving device.

  Conventionally, as shown in FIG. 9, as the light emitting element driving device 1, a light emitting element 2, a driving unit 3 that drives the light emitting element 2, first and second power storage elements 4 and 5 that can store electricity, and a driving unit 3. And the light emitting element drive device 1 provided with the battery power supply 6 which can supply electric power to each electrical storage element 4 and 5 is known. In addition, the light emitting element driving device 1 includes a camera unit 7 that can capture an image, a control unit 8 that controls the entire device, a boosting unit 9 that boosts the power supplied from the battery power supply 6, and each storage element connected in series. And balance resistors 10 and 10 for uniformly storing 4 and 5.

  And in the light emitting element drive device 1, the drive means 3 is provided with the inverter (NOT gate) 11 and the 1st and 2nd switch part (CMOS) 12,13, and each electrical storage element 4,5 is battery power supply. 6 for storing the power supplied from 6 (hereinafter also referred to as “storage state”) and for supplying the power stored in each of the storage elements 4 and 5 to the light emitting element 2 (hereinafter also referred to as “discharge state”). It is comprised so that switching is possible (for example, patent document 1). Below, an electrical storage state and a discharge state are demonstrated, respectively.

  First, in the storage state, when the control unit 8 outputs the L signal, the L signal is applied to the input of the inverter 11, and the H signal is applied to the input of the gate of the first CMOS 12, so that the first CMOS 12 is turned on. On the other hand, since the L signal is applied to the input of the gate of the second CMOS 13, the second CMOS 13 is turned OFF (open). Thereby, current i1 flows from the battery power source 6 to the first CMOS 12, the booster 9, and the closed loops of the power storage elements 4 and 5, so that the power storage elements 4 and 5 store the power supplied from the battery power source 6.

  In the discharge state, when the control unit 8 outputs an H signal to operate the circuit, the H signal is applied to the input of the inverter 11, and the L signal is applied to the input of the gate of the first CMOS 12. Therefore, the first CMOS 12 is turned off (opened), while the H signal is applied to the input of the gate of the second CMOS 13, so the second CMOS 13 is turned on (closed). As a result, the current i2 flows through the closed loops of the power storage elements 4 and 5, the light emitting element 2, and the second CMOS 13, and the power storage elements 4 and 5 supply power to the light emitting element 2, whereby the light emitting element 2 emits light.

JP 2007-108545 A

  By the way, in the light emitting element driving device 1 shown in FIG. 9, for example, the voltage value of the electric power that can be supplied by the battery power source 6 is 3.6V, and the voltage value of the electric power that can be supplied by each of the storage elements 4 and 5 is 2.5V. On the other hand, since the voltage value of the power for causing the light emitting element 2 to emit light needs 4.0 V higher than those voltage values, the booster 9 is disposed, or the power storage elements 4 and 5 Are connected in series.

  Specifically, in the storage state, the boosting unit 9 boosts the power of the voltage value 3.6V supplied from the battery power source 6 to the voltage value 5.0V, so that the two power storage elements 4 and 5 have the added voltage value. Electric power can be stored until the voltage reaches 5.0 V, and in the discharged state, the battery power supply 6 and one power storage element 4 (5 are discharged by discharging the power of the additional voltage value 5.0 V from the two power storage elements 4 and 5. ) Can be supplied to the light emitting element 2, so that the light emitting element 2 can emit light.

  However, in order to cause the light emitting element 2 to emit light and then to emit light again, it is necessary to store the two discharged power storage elements 4 and 5 again. Therefore, when it is desired to emit light at a short interval (continuously), that is, when it is desired to capture an image at a short interval (continuously), the power storage of each of the power storage elements 4 and 5 is not in time, and it is impossible to capture images at a desired timing. Is caused.

  Therefore, in view of such circumstances, it is an object of the present invention to provide a light emitting element driving device and a portable device that can shorten a time during which the light emitting element cannot emit light.

A light-emitting element driving device according to the present invention includes a light-emitting element, a driving unit that drives the light-emitting element, first and second power storage elements that can store power, a battery power source that can supply power to the driving unit and each power storage element, In a light emitting element driving apparatus including a control unit that is supplied with electric power from a battery power source and controls the driving unit, the driving unit connects each of the storage elements and the light emitting elements connected in series to the battery power source in parallel. A power storage state in which the power supplied from the battery power source is stored in each power storage element, and the battery power source, the first power storage element, and the light emitting element are connected in series, and the power stored in the first power storage element is supplied to the light emitting element. The second power storage element is configured to be switchable to a discharge state in which the power stored in the second power storage element is supplied to the control unit.

  According to the light emitting element driving apparatus according to the present invention, the driving means connects the battery power source, the first power storage element, and the light emitting element in series in a discharging state in which the power stored in the first power storage element is supplied to the light emitting element. Thus, by setting the added voltage value of the power that can be supplied to the light emitting element of the battery power source and the first power storage element to be larger than the voltage value for causing the light emitting element to emit light, Since the light-emitting element can emit light, in order to cause the light-emitting element to emit light again, one power storage element needs to be stored.

  Moreover, in the discharged state, the driving unit supplies the control unit with the electric power stored in the second power storage element. As a result, since the second power storage element functions as a backup power source for the control unit, the control unit can be driven stably even if an unexpected trouble (for example, an instantaneous voltage drop) occurs when the battery power source is in a discharged state. Means can be controlled.

The light-emitting element driving apparatus according to the present invention includes a light-emitting element, a driving unit that drives the light-emitting element, first and second power storage elements that can store electricity, and a battery power source that can supply power to the driving unit and each power storage element In the light emitting element driving device comprising: the driving means, the storage elements connected in series and the light emitting elements are connected in parallel to the battery power supply, respectively, and the power supplied from the battery power supply is stored in each storage element. A power storage state, a battery power source, a first power storage element, and a light emitting element are connected in series, and a first discharge state in which power stored in the first power storage element is supplied to the light emitting element, a battery power source, a second power storage element, and a light emitting element Are connected in series, and can be switched to a second discharge state in which the power stored in the second power storage element is supplied to the light emitting element.

  According to the light emitting element driving device according to the present invention, in the first discharge state in which the power stored in the first power storage element is supplied to the light emitting element, the driving means connects the battery power source, the first power storage element, and the light emitting element in series. Connect. Thus, by setting the added voltage value of the power that can be supplied to the light emitting element of the battery power source and the first power storage element to be larger than the voltage value for causing the light emitting element to emit light, The light emitting element can emit light.

  In addition, the driving means connects the battery power source, the second power storage element, and the light emitting element in series, so that the power stored in the second power storage element released from the battery power source in the first discharge state is The light-emitting element can be supplied. Thereby, the light emitting element can emit light twice continuously by storing each power storage element.

  In addition, a portable device according to the present invention includes the light emitting element driving device.

  A portable device according to the present invention includes the light-emitting element driving device, an optical system that collects light, and an image sensor that receives light collected by the optical system, and the optical system includes an autofocus mechanism. And the driving means switches to the first discharge state to emit the light emitting element as auxiliary light for autofocus, and switches to the second discharge state to cause the light emitting element to emit light as flash light for imaging. Features.

  According to the mobile device of the present invention, the light emitting element can be caused to emit light as auxiliary light for autofocusing by switching the driving unit to the first discharge state. Thereafter, the driving unit switches to the second discharge state without storing the first power storage element in particular, so that the light emitting element can emit light as imaging flash light.

  Thereby, in the conventional portable device, after the two power storage elements are discharged, the light emitting element is caused to emit light as auxiliary light for autofocus, and then the two power storage elements are stored again and then discharged. In contrast to the necessity of causing the light emitting element to emit light as the flash light for use, the portable device according to the present invention can be operated continuously from autofocus to imaging.

  As described above, the light emitting element driving apparatus and the portable device according to the present invention have an excellent effect that the time during which the light emitting element cannot emit light can be shortened.

BRIEF DESCRIPTION OF THE DRAWINGS It is a general view of the portable apparatus which concerns on one Embodiment of this invention, Comprising: (a) is a perspective view, (b) is a perspective view from a different direction. Circuit diagram of light-emitting element driving device for portable device according to the embodiment The circuit diagram which shows the electrical storage state of the light emitting element drive device which concerns on the same embodiment The circuit diagram which shows the discharge state of the light emitting element drive device which concerns on the same embodiment The circuit diagram in the light emitting element drive device which concerns on other embodiment of this invention. The circuit diagram which shows the electrical storage state of the light emitting element drive device which concerns on the same embodiment The circuit diagram which shows the 1st discharge state of the light emitting element drive device which concerns on the same embodiment The circuit diagram which shows the 2nd discharge state of the light emitting element drive device which concerns on the same embodiment Circuit diagram of conventional light emitting element driving apparatus

  Hereinafter, a first embodiment of a light emitting element driving device and a portable device according to the present invention will be described with reference to FIGS. 1 to 4, the parts denoted by the same reference numerals as those in FIG. 9 represent the same configurations or elements as those in the prior art unless otherwise specified.

  As shown in FIGS. 1 and 2, the mobile device 14 according to the present embodiment is a mobile phone that includes the light emitting element driving device 1 and has an LED flash function and a digital camera function. The mobile device (hereinafter also referred to as “mobile phone”) 14 includes a first main body 15 and a second main body 17 that can be folded via the first main body 15 and the hinge mechanism 16.

  The first main body 15 includes an operation key unit 18 configured by numeric keys and the like for inputting the operation of the mobile phone 14 and a microphone 19 for inputting a transmission voice on the inner surface side when the mobile phone 14 is folded. Is provided. In addition, the first main body 15 is provided with a sounder 20 for notifying an incoming state or the like on the outer surface side when the mobile phone 14 is folded.

  The second main body 17 is provided with a speaker 21 that outputs a received voice and a first display 22 that displays characters and images on the inner surface side when the mobile phone 14 is folded. Further, the second main body 17 includes a second display 23 that displays characters and images on the outer surface side when the cellular phone 14 is folded, a light emitting element 2 that emits light, and a subject. And an optical system 24 that collects the light reflected by the light (light from the light-emitting element 2 or light such as sunlight).

  In addition to the light emitting element 2 described above, the light emitting element driving apparatus 1 includes a driving unit 3 that drives the light emitting element 2, first and second power storage elements 4 and 5 that can store power, a driving unit 3, and each power storage element 4. , 5 is provided with a battery power source 6 capable of supplying power. The light-emitting element driving device 1 includes an image pickup device 25 (not shown) that receives the light collected by the optical system 24 and can capture an image, and includes the drive unit 3 and the entire device. And a control unit (CPU) 8 to be controlled.

  Furthermore, the light emitting element driving device 1 includes a constant current circuit unit 26 that sets a current value of a current flowing through the light emitting element 2 to a predetermined value. The light emitting element driving device 1 is provided with diodes 27, 27 as necessary. The battery power supply 6 also supplies power to the camera unit 7 and the control unit 8.

  In the present embodiment, the light emitting element 2 is a (white) LED, and the driving unit 3 includes an inverter (NOT gate) 28 and first to fourth switch units (CMOS) 29 to 32. In addition, each of the power storage elements 4 and 5 is an electric double layer capacitor, and the battery power source 6 is a Li ion secondary battery. Further, the optical system 24 includes an autofocus mechanism and is an objective lens that is displaceable with respect to the image sensor 25. The image sensor 25 is a CMOS image sensor or a CCD image sensor.

  The driving means 3 is configured to be switchable between a power storage state in which the power supplied from the battery power supply 6 is stored in the power storage elements 4 and 5 and a discharge state in which the power stored in the power storage elements 4 and 5 is discharged. . And the drive means 3 makes each electrical storage element 4,5 and the light emitting element 2 connect in parallel with respect to the battery power supply 6, in the electrical storage state.

  Further, the driving unit 3 connects the battery power source 6, the first power storage element 4, and the light emitting element 2 in series in the discharging state (the first power storage element 4 and the light emitting element 2 are connected in series to the battery power source 6. The power stored in the first power storage element 4 is supplied to the light emitting element 2, while the power stored in the second power storage element 5 is supplied to the camera unit 7 and the control unit 8.

  The configurations of the light emitting element driving apparatus 1 and the mobile phone 14 according to the present embodiment are as described above. Next, the operation of the light emitting element driving apparatus 1 according to the present embodiment will be described with reference to FIGS. To do.

  First, as shown in FIG. 3, when the control unit 8 outputs an L signal in the charged state, the L signal is applied to the inputs of the gates of the first to third CMOSs 29 to 31. On the other hand, when the L signal is applied to the input of the inverter 28 and the H signal is applied to the input of the gate of the fourth CMOS 32, the fourth CMOS 32 is turned on (closed).

  As a result, since the current i1 flows from the battery power source 6 to the closed loop (shown by a bold solid line in FIG. 3) of the booster 9, the first power storage element 4, the fourth CMOS 32, and the second power storage element 5, each power storage element 4, 5 Stores the electric power supplied from the battery power source 6. At this time, the power storage elements 4 and 5 and the light emitting element 2 are connected in parallel to the battery power source 6 and a voltage is applied to the light emitting element 2 as well, but the third CMOS 31 is OFF (open). The light emitting element 2 does not emit light.

  Further, as shown in FIG. 4, in the discharge state, when the control unit 8 outputs an H signal to operate the circuit, the H signal is applied to the inputs of the gates of the first to third CMOSs 29 to 31. While the first to third CMOSs 29 to 31 are turned on (closed), the H signal is applied to the input of the inverter 28, so that the L signal is applied to the input of the gate of the fourth CMOS 32. Open).

  As a result, first, the current i2 flows from the battery power source 6 to the closed loop (shown by a thick solid line in FIG. 4) of the first CMOS 29, the first power storage element 4, the constant current circuit unit 26, the light emitting element 2, and the third CMOS 31. The power source 6 and the first power storage element 4 supply power to the light emitting element 2. At this time, the voltage value obtained by adding the voltage value of the electric power supplied from the battery power source 6 and the voltage value of the electric power discharged from the first power storage element 4 becomes larger than the voltage value of the electric power emitted from the light emitting element 2. Yes.

  Therefore, since a voltage sufficient to emit light is applied to the light emitting element 2, a current set to a predetermined current value by the constant current circuit unit 26 flows to the light emitting element 2 and the light emitting element 2 emits light. . In addition, the light emitting element 2 is configured such that the added voltage value between the battery power source 6 and the first power storage element 4 is smaller than the voltage value causing the light emitting element 2 to emit light, or the control unit 8 outputs an L signal, The light continues to be emitted until the current i2 flowing through is cut off.

  On the other hand, since the current i3 flows from the second power storage element 5 to the closed loop (shown by a thick solid line in FIG. 4) of the second CMOS 30, the diode 27, and the control unit 8 (and the camera unit 7), the second power storage element 5 is controlled. Power is supplied to the unit 8 and the camera unit 7. At this time, since the battery power supply 6 also supplies power to the control unit 8 and the camera unit 7, the second power storage element 5 functions as a backup power source for the control unit 8 and the camera unit 7.

  As described above, according to the light emitting element driving device 1 and the portable device 14 according to the present embodiment, the driving unit 3 connects the battery power source 6, the first power storage element 4, and the light emitting element 2 in series in the discharged state. The electric power stored by the first power storage element 4 is supplied to the light emitting element 2. As a result, by setting the added voltage value of the power that can be supplied to the light emitting element 2 of the battery power source 6 and the first power storage element 4 to be larger than the voltage value for causing the light emitting element 2 to emit light, the first power storage The light emitting element 2 can emit light by discharging only the element 4.

  Therefore, in order to cause the light emitting element 2 to emit light again, it is only necessary to store only the electric power consumed by the power storage elements 4 and 5. Specifically, when there is no power consumption in the second power storage element 5, only the power consumed by the first power storage element 4, that is, only the power consumed by one power storage element 4 needs to be stored. The time during which 2 cannot emit light can be shortened.

  Further, according to the light emitting element driving device 1 and the portable device 14 according to the present embodiment, the second power storage element 5 is released from the battery power source 6, the first power storage element 4, and the light emitting element 2 in the discharged state, and the second power storage. The power stored in the element 5 is supplied to the control unit 7 and the camera unit 8. Thereby, since the 2nd electrical storage element 5 functions as a backup power supply of the control part 7 and the camera part 8, even if the battery power supply 6 generate | occur | produces an unexpected trouble (for example, instantaneous voltage drop) at the time of a discharge state, The control unit 7 and the camera unit 8 can operate stably.

  Next, a second embodiment of the light emitting element driving apparatus according to the present invention will be described with reference to FIGS. 5-8, the part which attached | subjected the code | symbol same as the code | symbol of FIGS. 1-4 is the same structure or element as 1st Embodiment unless there is particular description.

  As shown in FIG. 5, the light emitting element driving apparatus 1 according to this embodiment is different in the configuration of the driving unit 3 from the light emitting element driving apparatus 1 according to the first embodiment. In the present embodiment, the driving means 3 includes first and second inverters (NOT gates) 33 and 34, first and second AND gates 35 and 36, first to sixth switch units (CMOS) 37 to 42, and It has.

  The driving unit 3 stores the power supplied from the battery power source 6 in each of the power storage elements 4 and 5, and the first power storage element 4 stores the light so that the light emitting element 2 emits light as auxiliary light for autofocusing. It is configured to be switchable between a first discharge state in which electric power is discharged and a second discharge state in which the electric power stored in the second power storage element 5 is discharged so that the light emitting element 2 emits light as imaging flash light. Note that the driving unit 3 connects the power storage elements 4 and 5 and the light emitting element 2 in parallel to the battery power source 6 in the power storage state.

  In addition, the driving unit 3 connects the battery power source 6, the first power storage element 4, and the light emitting element 2 in series in the first discharge state, so that the power stored in the first power storage element 4 is supplied to the light emitting element 2. Supply. Further, the driving means 3 connects the battery power source 6, the second power storage element 5, and the light emitting element 2 in series during the second discharge state, so that the power stored by the second power storage element 5 is supplied to the light emitting element 2. Supply.

  The configuration of the light emitting element driving apparatus 1 according to the present embodiment is as described above. Next, the operation of the light emitting element driving apparatus 1 according to the present embodiment will be described with reference to FIGS.

  First, as shown in FIG. 6, when the control unit 8 outputs the L signal as the first signal in the charged state, the L signal is applied to the gate input of the first CMOS 37, so that the first CMOS 37 is turned off (opened). On the other hand, when the L signal is applied to the input of the second inverter 34, the H signal is applied to the inputs of the gates of the second and third CMOSs 38 and 39, so that the second and third CMOSs 38 and 39 are turned on. (Closed).

  Further, since the L signal is applied to the first inputs of the first and second AND gates 35 and 36, respectively, the first and second AND gates are independent of the second input (the second signal output from the control unit 8). The two AND gates 35 and 36 output the L signal. Thereby, since the L signal is applied to the inputs of the gates of the fourth to sixth CMOSs 40 to 42, the fourth to sixth CMOSs 40 to 42 are turned off (open).

  Accordingly, since the current i1 flows from the battery power source 6 to the closed loop (shown by a bold solid line in FIG. 6) of the booster 9, the second power storage element 5, the second CMOS 38, the first power storage element 4, and the third CMOS 39, each power storage element 4 , 5 store the electric power supplied from the battery power source 6. At this time, the power storage elements 4 and 5 and the light emitting element 2 are connected in parallel to the battery power source 6, and a voltage is applied to the light emitting element 2, but the first CMOS 37 is OFF (open). The light emitting element 2 does not emit light.

  Next, as shown in FIG. 7, in the first discharge state in which the light emitting element 2 emits light as auxiliary light for autofocusing, when the control unit 8 outputs an H signal as the first signal, the gate of the first CMOS 37 is turned on. Since the H signal is applied to the input, the first CMOS 37 is turned on (closed), while the H signal is applied to the input of the second inverter 34, so that the input to the gates of the second and third CMOSs 38 and 39 is L. Since the signal is applied, the second and third CMOSs 38 and 39 are turned off (open).

  When the control unit 8 outputs the H signal as the second signal, the first AND gate 35 outputs the H signal because the H signal is applied to the first and second inputs, respectively. As a result, the H signal is applied to the inputs of the gates of the fourth and fifth CMOSs 40 and 41, so that the fourth and fifth CMOSs 40 and 41 are turned on (closed).

  Furthermore, since the H signal is applied to the input of the first inverter 33 while the H signal is applied to the input of the first inverter 33, the L signal is applied to the second input of the second AND gate 36. The L signal is output. Thereby, since the L signal is applied to the input of the gate of the sixth CMOS 42, the sixth CMOS 42 is turned off (opened).

  Therefore, since the current i2 flows from the battery power source 6 to the closed loop (shown by a thick solid line in FIG. 7) of the fourth CMOS 40, the first power storage element 4, the fifth CMOS 41, the constant current circuit unit 26, the light emitting element 2, and the first CMOS 37, the battery The power source 6 and the first power storage element 4 supply power to the light emitting element 2. Therefore, a current set to a predetermined current value by the constant current circuit unit 26 flows to the light emitting element 2 and the light emitting element 2 emits light.

  Furthermore, as shown in FIG. 8, in the second discharge state in which the light emitting element 2 emits light as imaging flash light, when the control unit 8 outputs an H signal as the first signal, the input to the gate of the first CMOS 37 is performed. Since the H signal is applied, the first CMOS 37 is turned on (closed), while the H signal is applied to the input of the second inverter 34, so that the L signal is input to the gates of the second and third CMOSs 38 and 39. Since the voltage is applied, the second and third CMOSs 38 and 39 are turned off (open).

  When the control unit 8 outputs the L signal as the second signal, the first AND gate 35 applies the H signal to the first input while the L signal is applied to the second input. Output a signal. As a result, the L signal is applied to the inputs of the gates of the fourth and fifth CMOSs 40 and 41, so that the fourth and fifth CMOSs 40 and 41 are turned off (open).

  Furthermore, since the H signal is applied to the first input of the second AND gate 36 while the L signal is applied to the input of the first inverter 33, the H signal is also applied to the second input. , H signal is output. Thereby, since the H signal is applied to the input of the gate of the sixth CMOS 42, the sixth CMOS 42 is turned on (closed).

  Accordingly, since the current i3 flows from the battery power source 6 to the closed loop (shown by a thick solid line in FIG. 8) of the sixth CMOS 42, the second power storage element 5, the constant current circuit unit 26, the light emitting element 2, and the first CMOS 37, The second power storage element 5 supplies power to the light emitting element 2. Therefore, a current set to a predetermined current value by the constant current circuit unit 26 flows to the light emitting element 2 and the light emitting element 2 emits light.

  As described above, according to the light-emitting element driving device 1 and the portable device 14 according to the present embodiment, in the first discharge state, the light-emitting element 2 can be caused to emit light by the discharge of the first power-storage element 4, while the first power storage. By switching to the second discharge state without storing the element 4, the light emitting element 2 can emit light by the discharge of the second storage element 5. Therefore, since the light emitting element 2 can emit light continuously, the time during which the light emitting element 2 cannot emit light can be shortened.

  In addition, according to the light emitting element driving device 1 and the portable device 14 according to the present embodiment, the light emitting element 2 can be caused to emit light as auxiliary light for autofocus by switching the driving unit 3 to the first discharge state. Thereafter, the light-emitting element 2 can be caused to emit light as imaging flash light by the drive unit 3 switching to the second discharge state without storing the first power storage element 4 in particular.

  As a result, in the conventional portable device, the two power storage elements 4 and 5 are discharged, so that the light emitting element 2 emits light as auxiliary light for autofocus, and then the two power storage elements 4 and 5 are stored again. However, according to the light-emitting element driving device 1 and the portable device 14 according to the present embodiment, it is continuously performed from autofocus to imaging. Operation.

  The light-emitting element driving device and the portable device according to the present invention are not limited to the above-described embodiments, and it is needless to say that various changes can be made without departing from the gist of the present invention. In addition, the configurations and methods of the plurality of embodiments described above may be arbitrarily adopted and combined, or the configurations and methods according to one embodiment may be applied to the configurations and methods according to other embodiments. Of course it is good.

  The light-emitting element driving device and the portable device according to the present invention can be applied to uses of portable devices such as a light-emitting element driving device and a mobile phone that need to shorten the time during which the light-emitting element cannot emit light.

DESCRIPTION OF SYMBOLS 1 Light emitting element drive device 2 Light emitting element 3 Drive means 4 1st electrical storage element 5 2nd electrical storage element 6 Battery power supply 8 Control part 14 Portable apparatus (mobile telephone)
24 Optical system 25 Image sensor

Claims (4)

A light emitting element, a driving means for driving the light emitting element, first and second power storage elements capable of storing electricity, a battery power source capable of supplying power to the driving means and each power storage element, and a driving means supplied with power from the battery power source. In the light emitting element driving device including the control unit for controlling, the driving unit connects each power storage element and the light emitting element connected in series to the battery power source in parallel, and supplies power supplied from the battery power source to each power source. The power storage state stored in the power storage element, the battery power source, the first power storage element, and the light emitting element are connected in series, and the power stored in the first power storage element is supplied to the light emitting element, while the power stored in the second power storage element is supplied. A light emitting element driving device configured to be switchable between a discharge state supplied to a control unit. In a light emitting element driving device comprising: a light emitting element; a driving means for driving the light emitting element; first and second power storage elements capable of storing electricity; and a battery power source capable of supplying power to the driving means and each power storage element. A storage state in which each storage element and light emitting element connected in series are connected in parallel to the battery power supply, and the power supplied from the battery power supply is stored in each storage element; the battery power supply and the first storage element; A first discharge state in which a light emitting element is connected in series and the power stored in the first power storage element is supplied to the light emitting element, a battery power source, a second power storage element, and the light emitting element are connected in series, and the second power storage element is stored in power. The light emitting element driving device is configured to be switchable to a second discharge state in which the electric power supplied to the light emitting element is supplied. A portable device comprising the light emitting element driving device according to claim 1. A light-emitting element driving apparatus according to claim 2, an optical system that collects light, and an image sensor that receives light collected by the optical system, the optical system including an autofocus mechanism, A portable device characterized by switching to a first discharge state to cause the light emitting element to emit light as auxiliary light for autofocus, while switching to a second discharge state to cause the light emitting element to emit light as flash light for imaging.

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