Electronic flash device
AssigneeNikon Corporation
InventorsHideki Matsui, Zhaoxiang Chen
Life of this patent
Estimating the term…
Abstract
An electronic flash device includes: a flash light emission circuit that performs a flash light emission; a light emission control circuit that supplies power for light emission to the flash light emission circuit in response to an input of a light emission start signal and cuts off the power to the flash light emission circuit in response to an input of a light emission stop signal; and a protective circuit that detects a state that will induce power supply to the flash light emission circuit in response to an anomalous signal based upon a circuit operation of the light emission control circuit and prevents the power supply to the flash light emission circuit.
Claims14
An electronic flash device comprising:
- a flash light emission circuit that performs a flash light emission;
- a light emission control circuit that supplies power for light emission to the flash light emission circuit in response to an input of a light emission start signal and cuts off the power to the flash light emission circuit in response to an input of a light emission stop signal;
- and
- a protective circuit that detects a state that will induce power supply to the flash light emission circuit in response to an anomalous signal based upon a circuit operation of the light emission control circuit and prevents the power supply to the flash light emission circuit.
An electronic flash device comprising:
- a flash light emission circuit that performs a flash light emission;
- a light emission control circuit that supplies power for light emission to the flash light emission circuit in response to an input of a light emission start signal and cuts off the power to the flash light emission circuit in responses to an input of a light emission stop signal;
- and
- a protective circuit that detects a state that will induce power supply to the flash light emission circuit without an input of the light emission start signal based upon a circuit operation of the light emission control circuit and prevents the power supply to the flash light emission circuit.
An electronic flash device comprising:
- a flash light emission circuit that performs a flash light emission;
- a light emission control circuit that supplies power for light emission to the flash light emission circuit in response to an input of a light emission start signal and cuts off the power to the flash light emission circuit in response to an input of a light emission stop signal;
- and
- a protective circuit that detects a state that induces power supply to the flash light emission circuit in response to an anomalous signal based upon a circuit operation of the light emission control circuit and prevents a power supply cutoff to the flash light emission circuit.
An electronic flash device comprising:
- a flash light emission circuit that performs a flash light emission;
- a light emission control circuit that supplies power for light emission to the flash light emission circuit in response to an input of a light emission start signal and cuts off the power to the flash light emission circuit in response to an input of a light emission stop signal;
- and
- a protective circuit that detects a state that induces power supply to the flash light emission circuit without an input of the light emission start signal based upon a circuit operation of the light emission control circuit and prevents cutoff of power supply to the flash light emission circuit.
Dependencies are inferred from the claim text.