Golf swing practice machine

A golf swing practice machine comprising:

• a club part (100) adapted to be swung by a golfer;
• a bottom part (200) on which a virtual golf ball (210) to be struck by the swing of the club part (100) is placed;
• and
• an application (300) for evaluating the state of the club part (100), when the golf ball placed on the bottom part (200) is struck, or selecting the type of a practice club,
• whereby the swing state of the club part (100) is analyzed,
• wherein the club part (100) comprises:
• a grip (120) held by the golfer's hands;
• a head unit (130) having a light receiver and a light transmitter adapted to display a position thereof;
• a shaft (110) for connecting the grip (120) and the head unit (130) to each other;
• and
• an inertial measurement unit (IMU) including an acceleration sensor and a gyroscope sensor, the IMU being disposed at given positions thereof to determine position information thereof,
• wherein the bottom part (200) comprises:
• the virtual golf ball (210) disposed thereon;
• a backswing sensing means for sensing a backswing of the club part (100);
• and
• an impact sensing means for sensing a moment of impact on the virtual golf ball (210) after the club part (100) starts to perform a downswing after the backswing,
• wherein the application (300) comprises a controller (310), an operation module (320), an input part (330), a display part (340), and a storage part (350), and
• wherein the backswing sensing means comprises a first slit beam (232) irradiated vertically onto the bottom part (200) from a first light transmitter (222) disposed on the bottom part (200) and a light receiving sensor disposed on an underside (135) of the head unit (130) to receive the first slit beam (232), so that when the club part (100) starts the backswing, the light receiving sensor transmits a first sensing signal to the controller (310) at the moment when the first slit beam (232) is detected, and the controller (310) determines a time point when the first sensing signal is received as a time point when the backswing is started and stores the time point in the storage part (350).