Patent Number: 
Section: claims

1. An optical substance manipulator capable of manipulating microscopic particles dispersed in a flowing fluid by means of light pressure, characterized by comprising an optical system that forms two linear light-collective areas simultaneously with respect to a fluid that flows on a subject surface, and further comprising, in optical paths forming the respective linear light-collective areas, means adapted to adjust directions of the linear light-collective areas on the subject surface, means adapted to adjust positions of the linear light-collective areas, said optical system compriseslight splitter means adapted to split light coming out of one light source into two beams, each beam having a separate optical path,means adapted to independently adjust each beam for controlling the direction of each of the linear light-collective areas,means adapted to independently adjust each beam for controlling the position of each of the linear light-collective areas,light synthesis means adapted to synthesize the light split into two beams, andan object lens adapted to collect the synthesized light to form the two linear light-collective areas simultaneously on a subject surface, whereineach linear light-collective area is a light beam having a linear profile as viewed on the subject surface. 2. The optical substance manipulator according to claim 1, characterized in that said means adapted to adjust the directions of the linear light-collective areas is a cylindrical lens or mirror adjustable in terms of rotation about its optical axis. 3. The optical substance manipulator according to claim 2, characterized in that the means adapted to adjust the positions of the linear light-collective areas comprises an optical element adjustable in terms of position along the direction of propagation of the beam and angle.