Electronic flash unit

A flash photographic system using an electronic flash unit having capacitor means to be charged with the output of a voltage boosting circuit for boosting the output of a battery and a flash tube for emitting flash light by discharging the stored voltage on said capacitor means therethrough, comprising:

• (a) load means to be driven by the output of said battery;
• (b) first and second capacitors constituting said capacitor means, the capacitance of said first capacitor being set to a small value compared with the capacitance of said second capacitor, said first capacitor being connected to said boosting circuit, and said second capacitor being connected through switching means to said boosting circuit;
• and
• (c) a drive signal forming circuit for producing a drive signal for driving said load means by the output of said battery, said switching means being turned off in response to said drive signal.

A flash device comprising:

• (a) an electrical power source circuit
• (b) capacitor means including first and second capacitors, the capacitance of said first capacitor being set to a small value compared with the capacitance of said second capacitor, and both of said capacitors being charged with the output of said electrical power source circuit
• (c) flash tube for emitting flash light by discharging the charge stored on said capacitor means
• (d) inhibiting means for inhibiting said second capacitor from being charged during the time when load means to be driven by the output of said electrical power source circuit is in driven states.