Electronic flash apparatus with constant duration repeated flash
AssigneeNikon Corporation
InventorHideki Matsui
Life of this patent
Estimating the term…
Abstract
An electronic flash apparatus having: a condenser; a flash tube which is connected with said condenser and flashes when electricity stored in the condenser is discharged; and a flash operation control device for performing drive control of said flash tube so that the flash tube flashes repeatedly when electricity stored in said condenser is applied to the flash tube. The flash operation control circuit varies the luminous amount of each of the repeated flashes of the flash tube according to the voltage accumulated in the condenser.
Claims3
An electronic flash apparatus comprising:
- a capacitor;
- a flash tube which is connected with said capacitor and flashes when electricity stored in said capacitor is discharged;
- and
- a flash operation control device for performing drive control of said flash tube so that the flash tube flashes repeatedly when electricity stored in said capacitor is applied to the flash tube,
- wherein said flash operation control device has:
- a reference voltage generator device for generating a value of the reference voltage from the value of the voltage accumulated in said capacitor;
- a light quantity integrating device for obtaining the integrated value of quantity of light of the flash emitted from said flash tube;
- and a comparison device for comparing the output value of said reference voltage generator device with the output value of said light quantity integrating device, and
- wherein said flash operation control device adjusts the flash operation of said flash tube if the integrated value of the luminous amount of the flash emitted from the flash tube is judged to become greater than the value of the reference voltage generated from the value of the voltage accumulated in said capacitor.
An electronic flash apparatus comprising:
- a charge storage device storing a charge for a repetitive flash operation;
- a flash connected with said charge storage device;
- a reference charge generator generating a reference charge based on dividing said stored charge of said charge storage device;
- a flash intensity determining device determining an integrated flash intensity charge representing an integrated value of a quantity of light of flashes emitted during the repetitive flash operation;
- and
- a flash adjusting device adjusting the flash emitted during the respective flash operation when the integrated flash intensity charge is greater than said reference charge.
A method for flashing an electronic flash comprising the steps of:
- storing a charge;
- generating a reference charge by dividing the stored charge;
- applying the stored charge to the flash;
- determining an integrated flash intensity charge representing an integrated value of a quantity of light of flashes emitted during a repetitive flash operation;
- and,
- adjusting the luminous amount of each of the repeated flashes when the integrated flash intensity charge is greater than the reference charge.
Dependencies are inferred from the claim text.