Abstract: A lens array includes an edge lens region provided with multiple first type lenslets, a middle lens region provided with multiple second type lenslets and a center lens region provided with multiple third type lenslets. One of the first type lenslets has a first curved surface with a first vertex, one of the second type lenslets has a second curved surface with a second vertex, and one of the third type lenslets has a third curved surface with a third vertex. A first tangent plane to the first curved surface at the first vertex, a second tangent plane to the second curved surface at the second vertex, and a third tangent plane to the third curved surface at the third vertex are parallel to or coincide with each other.

Abstract: A mobile device includes a housing, a first radiation element, a second radiation element, a third radiation element, a first switch element, and a second switch element. The first radiation element has a first feeding point. The second radiation element has a second feeding point. The first radiation element, the second radiation element, and the third radiation element are distributed over the housing. The first switch element is closed or open, so as to selectively couple the first radiation element to the third radiation element. The second switch element is closed or open, so as to selectively couple the second radiation element to the third radiation element. An antenna structure is formed by the first radiation element, the second radiation element, and the third radiation element.

Abstract: A heat recycling system for a high-temperature exhaust gas contains a body having a combustion space, at least one burning device, and a storing device; characterized in that: the combustion space is connected with an exhaust pipe; the burning device is coupled with a heat recycling blower and a gas control valve; the storing device is secured on a distal end of the exhaust pipe and is comprised of a second control valve, a first store tank, and a second store tank; the second control valve is disposed on the exhaust pipe of the body and includes two output ends which connect with a gas guiding tube and a second guiding tube respectively; the first store tank is coupled with the gas guiding tube and is connected with a first check valve and a second check valve, the gas check valve is coupled with a first gas-exhausting blower.