Abstract: A smart helmet including a projection surface, a projection unit, a processing unit, and a first pivoting unit is provided. The projection unit projects an image light into the projection surface according to a projection data. The processing unit coupled to the projection unit, and provides the projection data to the projection unit. The first pivoting unit is adapted to adjust a projection angle of the projection unit projecting on the projection surface, and has three rotational degrees of freedom.

Abstract: A lens device includes a lens unit that is connected fixedly to a coupling ring disposed coaxially in and coupled axially and movably to a hollow tubular body of a lens seat. A radially extending engaging stub of the coupling ring engages movably with a slot that is formed in the tubular body and that extends in an axial direction of the lens seat, and engages movably with a curved guiding groove in an operating sleeve sleeved rotatably on the tubular body. Movement of the engaging stub along the guiding groove in the operating sleeve in response to rotation of the operating sleeve relative to the tubular body causes the engaging stub on the coupling ring to move along the slot in the tubular body in the axial direction, thereby adjusting the lens unit to a desired focusing position.

Abstract: A detachable pan handle structure includes a pan body and a handle. The bottom section of the handle of the pan is provided with an arch-shaped actuating block. The bottom side of the actuating block is connected to the handle, and the other three sides of the block are positioned with an open slot, the actuating block has one side being connected and three other sides of the block are opened without a connection, so that the actuating block can be bent downward and can be withdraw from an engaging hole thereby enabling the pan handle to be detached from the body of a pan.