Abstract: A concentrating lens includes an incident surface, an emitting surface, and a reflective surface. The incident surface includes a central portion and an outer portion. The incident surface is formed by an inner surface of a depression portion. The reflective surface surrounds the emitting surface. The reflective surface extends so as to go toward a first side as going toward an outside. A first light incident on the outer portion of the incident surface transmits through the outer portion, is reflected by the reflective surface, reflected by the incident surface, and incident on the emitting surface. A second light incident on the central portion of the incident surface transmits through the central portion and is incident on the emitting surface. The central portion of the incident surface reflects the first light reflected by the reflective surface, toward the emitting surface and transmits the second light.

Abstract: The present invention discloses a terahertz material with therapeutic and health care effect and its preparation method and application, which includes the following raw materials in parts by weight: 15˜28 SiO2, 3˜8 Al2O3, 1˜3 selenium, 2˜5 germanium, 10˜15 Fe2O3, 35˜45 ochre, 20˜35 zinc oxide, 65˜80 CaCO3, 0.1˜0.5 rare earth palladium, 1˜10 SiOx, wherein the raw materials of components are mixed according to the above proportion, and crushing, heating to 600˜1200° C. in an oxygen free environment for 3˜8 hours, and then secondary crushing, having a fineness of 3000˜8000 mesh; and then, after crushing again and powdering processing, the fineness reaches more than 10000 mesh. After being enhanced treatment by the terahertz irradiation line, the terahertz materials with therapeutic and health care effects are obtained. They can be processed and manufactured into a variety of physiotherapy equipment, with fast action speed and stable effect on human body.