Patent ID: 7804422

Claim:
A lighting device comprising: a light-emitting element for emitting a light; an ultrasonic member for emitting an ultrasonic signal and receiving the ultrasonic signal reflected from an object; a signal processing unit communicated with the ultrasonic member for converting the reflected ultrasonic signal into a control signal; a light control unit interconnected between the signal processing unit and the light-emitting element for controlling the light-emitting element to emit the light in a selected operating mode in response to the control signal; a visual indicator; and an indicator control unit interconnected between the signal processing unit and the visual indicator for controlling the visual indicator to assert a notification signal indicative of the operating mode in response to the control signal; wherein the visual indicator includes: a collimator lens arranged downstream of a laser diode to collimate a laser beam emitted from the laser diode into a collimated laser beam; and an attenuator arranged downstream of the collimator lens for reducing the enerqy of the collimated laser beam.