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61 results about "Decreased thickness" patented technology

Surface light source unit, surface illumination device, and liquid crystal display device

Provided is a surface light source unit which has a high-directivity point light source and has a decreased thickness in the in the direction in which light is irradiated from said point light source. Also provided are a surface illumination device and a liquid crystal display device. A plurality of small chambers (311 to 322) having an opening on the top are formed in a housing (3) from side plates (3b to 3e) that have a predetermined height and partition plates (4) which partition the inside of the housing (3). Each small chamber is provided with a point light source (2) on the bottom part. The opening of each small chamber (311 to 322) is covered with a light transmitting/reflecting plate (511 to 522) which has a surface area (S), and comprises: a central reflecting section that has a surface area (ΔS), exhibits high reflectance and low transmittance, and is positioned directly above the point light source (2); and an outer reflecting section that surrounds the central reflecting section and is configured so that the light transmittance increases at distances further from the central reflecting section. The surface area (ΔS) and surface area (S) of each light transmitting/reflecting plate (511 to 522) are set in a manner such that the ratio ΔS/S is a predetermined value.
Owner:OPTO DESIGN INC

Wedge-shaped hole packer for liquid carbon dioxide phase change rock breaking

The invention discloses a wedge-shaped hole packer for liquid carbon dioxide phase change rock breaking. An inner cylinder (2) is a cylinder with the gradually increased thickness, and at least two inner cylinder vertical seams (21) are symmetrically formed in the upper portion of the inner cylinder (2); an outer cylinder (3) is a cylinder with the gradually decreased thickness, and at least two outer cylinder vertical seams (31) are symmetrically formed in the lower portion of the outer cylinder (3); the inner cylinder (2) is higher than the outer cylinder (3) and is sleeved with the outer cylinder (3), the two ends of the inner cylinder (2) and the two ends of the outer cylinder (3) are each provided with a small section of stretching part, the stretching parts do not make contact with one another, and two rope tying holes (6) are symmetrically formed in the stretching part arranged on the top of the inner cylinder (2). After the inner cylinder and the outer cylinder are combined together, the two ends of the inner cylinder and the two ends of the outer cylinder are each provided with a small section of stretching part, and the stretching parts do not make contact with one another; the inner cylinder stretches out for a small section, so that the rope tying holes are exposed to tension a wedge-shaped cylinder, and the outer cylinder stretches out for a small section, so that gas is gathered to push the inner cylinder to move upwards relative to the outer cylinder. According to the wedge-shaped hole packer, the structure is simple, operation is easy and convenient, and walls of a fracturing pipe and a fracturing hole are locked according to a wedge shape geometry principle, so that the fracturing hole achieves leakproofness and airtightness; accordingly, the rock breaking effect is enhanced, and pipe flashing is prevented.
Owner:CENT SOUTH UNIV
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