Patent ID: 7493701

Claim:
A self-leveling laser apparatus, comprising: a housing, a pendulum hanging within the housing, at least one laser generator fixed on the pendulum, a power source electrically connecting with the laser generator, and a locking device for fixing the pendulum, wherein the locking device comprising a motor and a locking member which is activated by the motor and movable between a fixed position and a released position wherein the locking member having a locking surface, and the pendulum having a contacting surface, when the locking member is in the fixed position, the locking surface thereof contacts the contacting surface of the pendulum, when the locking member is in the released position, the locking surface thereof does not contact the contacting surface of the pendulum, wherein the self-leveling laser apparatus further comprises a signal generator which is electrically connected with the motor and being operable to generate a locking signal and a releasing signal, and wherein the housing having a bottom surface for positioning the laser apparatus on a first surface, the signal generator comprising a light emitting member for projecting a detecting light on the first surface, and a detecting member for detecting the reflected detecting light from the first surface, and generating a corresponding electrical signal subsequently.