38 results about "Reflection nebula" patented technology

The invention relates to the technical field of optical lenses, in particular to a light distribution lens. A lens body is provided with a central reflection area; at least a part of small-angle light beams is refracted by an incidence area for entering the lens body, then directly irradiates the central reflection area, is reflected to a reflection area through the central reflection area, is reflected to a light exiting area through the reflection area and finally is refracted out of the lens body; at least a part of wide-angle light beams is refracted by the incidence area for entering the lens body, then directly irradiates the reflection area, is reflected to the light exiting area by the reflection area and is finally refracted out of the lens body. According to the light distribution lens, the small-angle light beams and the wide-angle light beams can be respectively controlled, the ability to control the small-angle light beams and the wide-angle light beams can be improved, and the design illumination effect of lens structures can be reliably guaranteed.

The invention belongs to the waveguide type terahertz functional device technical field and relates to a wide-band terahertz reflector of a composite periodic wave guide structure. Two periodic cylindrical hollow waveguides with different structure parameters, namely, a waveguide a and a waveguide b are connected together so as to form the wide-band terahertz reflector; the cylindrical hollow waveguides have Prague forbidden bands and non-Prague forbidden bands in terahertz bands, and the Prague forbidden bands and the non-Prague forbidden bands are arranged alternately. The wide-band terahertz reflector of the invention has the advantages of simple structure, small size, convenient operation and low cost. The wide-band terahertz reflector has no requirements for directions and can be used in a bidirectional manner with the reflection band and reflectivity of the reflector rarely varied, and the wide reflection band of the reflector ranges from 0.76 to 1.46THz, and the highest reflectivity of the reflector can reach 99.9%; the reflection band and reflectivity can be controlled and changed through adjusting the structure parameters of the two periodic structure waveguides; and the reflector is of a completely closed metal structure, and therefore, electromagnetic radiation and dielectric loss can be avoided, and packaging problems are not required to be considered.

The invention relates to an LED (Light Emitting Diode) luminous lamp. The LED luminous lamp comprises a frame body, wherein the frame body is at least internally provided with an LED exposure-prevention device, wherein the LED exposure-prevention device comprises a plurality of reflection bars which are arranged on the frame body and connected with two sides of the frame body; the reflection bars are vertically arranged, and the distances between the adjacent reflection bars are equal; each reflection bar is provided with a reflecting device; the reflection bar comprises an upper reflection bar and a lower reflection bar; the upper reflection bar and the lower reflection bar are connected together, and an included angle is formed between the upper reflection bar and the lower reflection bar; a supporting rod is arranged in front of the reflection bar; both ends of the supporting rod are connected with the two sides of the frame body; the supporting rod is provided with a plurality of LED lamps which are arranged in order and at equal intervals; a light source of each LED lamp faces to the reflection bar; and the distance between the adjacent reflection bars are between 1 cm and 2 cm. Compared with the prior art, a bather can keep ventilation with outdoors when taking a hot bath in summer, and meanwhile the bather can be prevented from being exposed possibly; and the problem that the bathroom is poor in ventilation and extremely stuffy in summer since the window must be closed in order to prevent exposure is solved.