Gravity sensing flashlight and its electric control circuit

1. A gravity sensing flashlight, comprising a lamp holder, a cylindrical body and a tail cover, the lamp holder being connected to a head end of the cylindrical body, the tail cover being connected to a tail end of the cylindrical body, a storage battery as a power supply being internally provided in the cylindrical body, a switch being additionally mounted on a side wall of the cylindrical body, characterized in that the switch consists of a switch leather sheath, a knockout rod, a knockout rod fixing frame and a circuit board fixing frame in turn from inside to outside, a circuit board being mounted on the circuit board fixing frame, a gravity sensor, a switch button and an indicator light being provided on the circuit board; and, the lamp holder consists of a shell cap, a shell body and a shell base which are in threaded connection to each other, a lens, a lens holder, an LED lamp bead and a lamp bead fixing frame being mounted in the shell body, a current chip controller being mounted on the lamp bead fixing frame, one end of the current chip controller being connected to the LED lamp bead while the other end thereof being connected to the gravity sensor;

wherein the shell base of the lamp holder is provided thereon with a mounting bracket consisting of more than three arc surfaces, an adjusting base being sheathed outside the mounting bracket, a rotating base being inserted inside the mounting bracket, a lug being provided on the rotating base, the width of the lug being the same as the width of a gap between the arc surfaces

wherein a conical surface fitted with the lamp bead fixing frame in the shell body is provided at an upper end of the rotating base;

wherein the gravity sensing flashlight further comprises a control circuit, the control circuit comprising a power supply circuit, a current chip circuit, a gravity sensing circuit and an LED lamp bead circuit which are connected in turn, characterized in that the current chip circuit is in signal connected to the gravity sensing circuit through a switch; the power supply circuit comprises a power supply chip; the current chip circuit comprises a current chip; the gravity sensing circuit comprises a gravity sensing chip; and, the LED lamp bead circuit comprises an LED lamp, a field effect transistor and a first resistor; and

wherein the switch and the control circuit are arranged to enable the flashlight to:

operate at a normal mode where a first brightness mode, a second brightness mode and a flashing mode can be selected, the first brightness mode being brighter than the second brightness mode; and

operate at an automatic mode, where the flashlight automatically judges and adjusts brightness according to change in action of a user in using the flashlight to illuminate different distances so that an upward movement of the headend relative to the tail end results in higher brightness than a downward movement of the headend relative to the tail end.

2. The gravity sensing flashlight according to claim 1 , characterized in that an outer side of the adjusting base is in a hexagon or an octagon shape.

3. The gravity sensing flashlight according to claim 1 , characterized in that the tail cover is in detachable connection to the cylindrical body, and a sealing ring is provided between the tail cover and the cylindrical body.