Abstract: A projector stand includes an elevator member fitted to a strut such that the elevator member can be raised and lowered, a guide plate fixed to the upper end of the elevator member, a slide member horizontally movable along the guide plate, and a three-axis adjustment mechanism provided or the slide member.

Abstract: A cylindrical winding tool 3 has three elongated members 5 obtained by splitting a cylindrical member in its axial direction into multiple pieces. The elongated members are interconnected in a hinged state in a circumferential direction by the magnet sheet. When the elongated members 5 are to be used, the elongated members 5 are placed in a spread state and arranged on the magnetically-attached object 4. When the elongated members 5 are not used, the elongated members 5 are gathered together in the circumferential direction, abutment sections 5b of the end faces of the adjacent elongated members are brought into abutment on each other and thus the cylindrical winding tool 3 having a required diameter can be formed.

Abstract: A board 2 for a projector includes a movable arm 5 for moving a projector 1 to a use position in front of a projection board 3 and to a storage position above the projection board and a cam mechanism 6 for elevating the movable arm 5 while swinging it. By elevation of the movable arm 5 by the cam mechanism 6, when the projector is positioned at the storage position, a body portion of the projector is positioned above an upper edge portion of the projection board, while when the projector is positioned at the use position, the body portion is positioned below the upper edge portion of the projection board. Even a projector with a short focal distance can be moved to the storage position and to the use position.

Abstract: Rosemarinic acid or its concentrate is made from seeds of lamiaceous plants in a predetermined period of germination. The method makes it possible to make the rosemarinic acid in any period through the year. High productivity can be achieved by small production facility since high-density cultivation of germinated seed is possible and a cultivation period is short. An amount of rosemarinic acid is rapidly increased after start of germination, and an increasing amount usually becomes maximum five to eight days after start of cultivation. Power obtained by pulverizing dry germinated seeds contains 3 to 5% of rosemarinic acid and can be used for various purposes. An extract obtained by water soluble alcohol from the powder and a fraction obtained by fractioning the extract by an organic solvent are concentrated containing about 15% and 30% of rosemarinic acid respectively. When each concentrate is processed by column chromatography, isolated 99%-rosemarinic acid is obtained.

Abstract: A reflection type screen having a high SG value, a wide view angle and an excellent color reproducibility of bright parts of projected image is provided. The reflection type screen comprises a substrate having a light reflecting property such as a white plastic film and a light diffusion layer 2 formed on the substrate, which contains a light diffusion agent and a pearl pigment dispersed in a binder resin. The pearl pigment is mica covered with titanium dioxide and has an optical characteristic reflecting blue component of light projected by a projector and transmitting light of a color complementary to blue. When PC images having many white parts or the like are projected on the screen, the bright part of the images does not become yellowish and projected images with high whiteness can be obtained. The content of pearl pigment is preferably 5-100 parts by weight based on 100 parts by weight of the binder resin and 10-150 parts by weight based on 100 parts by weight of the light diffusion agent.

Abstract: A portable screen assembly includes a spring-biased roll rotatably mounted to a lower casing, and a screen rotatably mounted at one end thereof to a top bar. The screen is set to a desired height by adjusting a repulsive force for a descent of the screen, and an upward biasing force of a height retaining device engaged with an expansion device against gravity and an elastic force of a spring attached to the spring-biased roll.

Abstract: A portable screen assembly includes first and second frames extending parallel to each other, a spring-biased roll rotatably mounted in the first frame, and a screen bonded at its one end to the second frame and wound around the spring-biased roll. An extender is provided for biasing the first and second frames away from each other to impart a predetermined tension to the screen. During use of the portable screen assembly, the first and second frames are supported generally verically by a purality of support legs.

Abstract: A reflective type screen has well-balanced properties and is capable of producing a clear image even in a lighted room. The screen has a reflective layer formed on a substrate, a polarizing film layer adhered to the reflective layer through an adhesive layer, and a light diffusion layer on the other side of the polarizing flim layer. The reflective layer preferably consists of a coating layer including a binder resin and aluminum paste and having a glossiness in the range of from 70 to 120% as measured according to JIS-K-7105. The glossiness of the surface of the product, i.e. the screen, is in the range of from 3 to 9%. In the above range of glossiness, the screen exhibits an even luminance and a good SG value.

Abstract: A method for the growth of semiconducting nitrides, such as GaN, InN, AlN, and their alloys, in an ultra-high vacuum chamber, wherein low energy atomic nitrogen is generated by a plasma-excited radical atom source, the atom beam is introduced to the heated substrate within a short distance, other gaseous reactants and dopants, such as TMGa, TMIn, TMAj, DEZn, CP.sub.2 Mg, SiH.sub.4, and similar organmetallic and hydride sources, are injected from a circular injector located between the substrate and the atom source, and therefore large area epitaxy with high growth rate is obtained.

Abstract: A portable screen assembly for use with a projector has a housing made up of a lower casing and an upper casing pivotally mounted on the lower casing to open or close the lower casing. The housing accommodates a roll rotatably mounted on the lower casing, a screen wound around the roll, a hanger bar to which one side of the screen is connected, and two extension robe assemblies having respective first ends pivotally mounted on the lower casing for movement between folded-down positions and erected positions generally perpendicular to each other. The hanger bar extends parallel to the roll in a spaced relationship when accommodated within the housing, while the two extension robe assemblies extend, when in the folded-down positions, in line with each other in a direction parallel to the roll and in a spaced relationship thereto. A bar clip is mounted on a second end of each of the extension robe assemblies.