Patent ID: 7106007

Claim:
A flashlight lamp circuit with automatic light adjustment, comprising: a flashlight lamp charging circuit, controlling charging of a main capacitor, and determining start and stop of charging according to a voltage level of the main capacitor so that the main capacitor is in a workable status; a flashlight activation unit, receiving a flashlight activation signal when the main capacitor is in a workable status, and executing flashlight activation according to the flashlight activation signal; a flashlight lamp, emitting a flashlight on a photographed object according to the flashlight activation signal; a light sensor, receiving and converting a light from the photographed object into a first electric signal; an integral circuit, receiving the first electric signal from the light sensor and outputting a second electric signal proportional to the amount of flashlight, wherein the integral circuit includes a light adjusting resistor for adjusting the resistance and output of the integral circuit; and a flashlight control unit, receiving the second electric signal from the integral circuit, wherein the flashlight control unit extinguishes the flashlight lamp when an amount of light corresponding to the level of the second electric signal reaches a required light exposure.