Video camera

A camera (1, 41), comprising:

• a base (3, 43);
• a cylindrical hollow main body (5, 45) mounted to the base (3, 43);
• an electric motor (9, 49) supported on a support (7, 47), with an external gear (11, 51) being mounted on an output shaft of the electric motor;
• a camera head assembly (13, 53), being configured to move up and down relative to the hollow main body (5, 45) and thus having an extended state and a concealed state, and being configured to rotate horizontally in the extended state, the camera head assembly (13, 53) comprising a cylindrical housing (17, 57), a lens module (19, 59) disposed at least partially in the cylindrical housing (17, 57), and a motherboard (21, 61) for controlling the electric motor (9, 49) and the lens module (19, 59);
• and
• an internal gear (15, 55) meshed with the external gear (11, 51);
• characterized in that one of the support (7, 47) supporting the electric motor (9, 49) and the internal gear (15, 55) is mounted in a fixed manner to the base (3, 43) or in the hollow main body (5, 45), and the other one of the support (7, 47) supporting the electric motor (9, 49) and the internal gear (15, 55) is mounted in a fixed manner to the camera head assembly (13, 53);
• and
• an annular groove (23, 63) and at least one helical groove (25, 65) extending upward from the annular groove (23, 63) are formed on an outer wall of a lower-half part of the cylindrical housing (17, 57) of the camera head assembly (13, 53), a corresponding circular guiding protrusion (29, 69) is disposed on an inner wall of the hollow main body (5, 45), and said circular guiding protrusion (29, 69) is capable of being received in the annular groove (23, 63) or in the corresponding helical groove (25, 65), such that up/down movement of the camera head assembly (13, 53) relative to the hollow main body (5, 45) and horizontal rotation of the camera head assembly (13, 53) can be driven by the electric motor (9, 49) alone.