Abstract: An optical module unit includes: optical modules each including light emitting elements; and a mount on which the light emitting elements are disposed on one side of the mount, and includes a sub-passage; and a manifold to which the optical modules are fixed. The manifold includes a first main passage to which a first end of each of the sub-passages is connected in parallel.

Abstract: An optical device includes: a plurality of optical components arranged along a first direction, each optical component having an optical surface, a first surface intersecting with the optical surface, and a second surface intersecting with the optical surface and the first surface; and a base member that integrally holds the plurality of the optical components and has a first holding surface and a second holding surface, the first holding surface holding the optical components and fixing positions of the optical components in a second direction intersecting with the first direction in a state of being in contact with the optical components on the first surface, the second holding surface holding the second surface of the optical components with an adhesive interposed therebetween and fixing positions of the optical components in a third direction intersecting with the first direction and the second direction.

Abstract: An optical device includes: a plurality of optical components arranged along a first direction, each optical component having an optical surface, a first surface intersecting with the optical surface, and a second surface intersecting with the optical surface and the first surface; and a base member that integrally holds the plurality of the optical components and has a first holding surface and a second holding surface, the first holding surface holding the optical components and fixing positions of the optical components in a second direction intersecting with the first direction in a state of being in contact with the optical components on the first surface, the second holding surface holding the second surface of the optical components with an adhesive interposed therebetween and fixing positions of the optical components in a third direction intersecting with the first direction and the second direction.

Abstract: One embodiment of the invention provides the corundum for filling in resin comprising three components having different secondary particle sizes and specific surface areas as follows: component X of 35 to 80 ?m and 1 to 0.01 m2/g; component Y of 1 to 5 ?m and 3 to 0.5 m2/g; and component Z of 0.3 to 1.5 ?m and 15 to 3 m2/g, with a composition ratio by mass (X:Y:Z) being in the range surrounded by four points of (60:40:0), (95:0:5), (95:5:0) and (60:0:40) not including the borderlines in the ternary compositional diagram, and a composition obtained by filling a specific amount of the corundum into silicone oil has a viscosity of less than 2,000 poise and a linseed oil absorption of 10 ml/100 g or less.

Abstract: One embodiment of the invention provides the corundum for filling in resin comprising three components having different secondary particle sizes and specific surface areas as follows: component X of 35 to 80 ?m and 1 to 0.01 m2/g; component Y of 1 to 5 ?m and 3 to 0.5 m2/g; and component Z of 0.3 to 1.5 ?m and 15 to 3 m2/g, with a composition ratio by mass (X:Y:Z) being in the range surrounded by four points of (60:40:0), (95:0:5), (95:5:0) and (60:0:40) not including the borderlines in the ternary compositional diagram, and a composition obtained by filling a specific amount of the corundum into silicone oil has a viscosity of less than 2,000 poise and a linseed oil absorption of 10 ml/100 g or less.

Abstract: A fine particle of aluminum hydroxide is disclosed, comprising a particulae aluminum hydroxide X having a specific surface area of 1.0 m2/g or less and a secondary particle size of 35 to 150 &mgr;m, a particulate aluminum hydroxide Y having a specific surface area of 1.0 m2/g or less and a secondary particle size of 10 to 35 &mgr;m and a particulate aluminum hydroxide Z having a specific area of 3.0 m2/g or less and a secondary particle size of 0.5 to 10 &mgr;m, in a compositional mass ratio falling in the area surrounded by four points of Point a, Point &bgr;, Point &ggr; and Point &dgr; including the lines in the ternary composition diagram shown in FIG. 1. By this fine particle of aluminum hydroxide, a fine particle of aluminum hydroxide and a resin composition comprising the fine particle of aluminum hydroxide, which can be reduced in the viscosity at the filling in a resin and attain high filling and when filled in a thermosetting resin, can be shortened in the curing time, can be provided.

Abstract: A fine particle of aluminum hydroxide is disclosed, comprising a particulate aluminum hydroxide X having a specific surface area of 1.0 m2/g or less and a secondary particle size of 35 to 150 &mgr;m, a particulate aluminum hydroxide Y having a specific surface area of 1.0 m2/g or less and a secondary particle size of 10 to 35 &mgr;m and a particulate aluminum hydroxide Z having a specific area of 3.0 m2/g or less and a secondary particle size of 0.5 to 10 &mgr;m, in a compositional mass ratio falling in the area surrounded by four points of Point &agr;, Point &bgr;, Point &ggr; and Point &dgr; including the lines in the ternary composition diagram shown in FIG. 1. By this fine particle of aluminum hydroxide, a fine particle of aluminum hydroxide and a resin composition comprising the fine particle of aluminum hydroxide, which can be reduced in the viscosity at the filling in a resin and attain high filling and when filled in a thermosetting resin, can be shortened in the curing time, can be provided.

Abstract: A fine particle of aluminum hydroxide is disclosed, comprising a particulate aluminum hydroxide X having a specific surface area of 1.0 m2/g or less and a secondary particle size of 35 to 150 &mgr;m, a particulate aluminum hydroxide Y having a specific surface area of 1.0 m2/g or less and a secondary particle size of 10 to 35 &mgr;m and a particulate aluminum hydroxide Z having a specific area of 3.0 m2/g or less and a secondary particle size of 0.5 to 10 &mgr;m, in a compositional mass ratio falling in the area surrounded by four points of Point &agr;, Point &bgr;, Point &ggr; and Point &dgr; including the lines in the ternary composition diagram shown in FIG. 1. By this fine particle of aluminum hydroxide, a fine particle of aluminum hydroxide and a resin composition comprising the fine particle of aluminum hydroxide, which can be reduced in the viscosity at the filling in a resin and attain high filling and when filled in a thermosetting resin, can be shortened in the curing time, can be provided.

Abstract: A high quality binary valued image is reproduced from a multivalued original image by a combination of density pattern processing and error diffusion processing using density patterns prepared previously in correspondence to each density value of pixels of an image to be reproduced.