Abstract: An optical pattern generation device includes: a first laser light source for emitting first laser light; a first diffractive optical element for changing a phase of the first laser light depending on a position on a plane perpendicular to a propagating direction of the first laser light, and emitting laser light having a phase distribution; a second diffractive optical element for changing a phase of incident laser light depending on a position on a plane perpendicular to a propagating direction of the incident laser light, and emitting laser light for forming an optical pattern; and a transfer optical system disposed between the first and second diffractive optical elements, for transferring the phase distribution of the laser light emitted from the first diffractive optical element to a phase distribution of laser light incident on the second diffractive optical element.

Abstract: In a plane perpendicular to the optical axis (10) of a lens (2), the direction in which the cylindrical surface has zero curvature is the direction of generatrix of the lens (2), and the direction in which the cylindrical surface has non-zero curvature and that is orthogonal to the direction of generatrix is the direction of curvature of the lens (2). A light source (1) is disposed at the focal position (21) in the direction of generatrix on the side of the incident surface (3) of the lens (2), and emits light toward the incident surface (3) of the lens (2), the light having a difference between the divergence angle in the direction of generatrix of the lens (2) and the divergence angle in the direction of curvature of the lens (2).

Abstract: A lens (10) has an incidence surface (11) having a cylindrical shape and forming a concave shape, and an emitting surface (12) forming a convex shape with respect to an optical axis (10a). A light source (20) has a large divergence angle in a vertical direction, and a divergence angle in a horizontal direction which is smaller than that in the vertical direction. The light source (20) is located at a position of focal length of the lens (10) in the vertical direction on a side of the incidence surface. The horizontal direction of the light source (20) is aligned with a curvature direction of the cylindrical shape of the lens (10).

Abstract: In a plane perpendicular to the optical axis (10) of a lens (2), the direction in which the cylindrical surface has zero curvature is the direction of generatrix of the lens (2), and the direction in which the cylindrical surface has non-zero curvature and that is orthogonal to the direction of generatrix is the direction of curvature of the lens (2). A light source (1) is disposed at the focal position (21) in the direction of generatrix on the side of the incident surface (3) of the lens (2), and emits light toward the incident surface (3) of the lens (2), the light having a difference between the divergence angle in the direction of generatrix of the lens (2) and the divergence angle in the direction of curvature of the lens (2).

Abstract: A diffractive optical element according to the present disclosure includes: a plurality of diffractive optical element segments, each diffractive optical element segment having an asperity shape on the segment's surface to vary phases of light entering the segment according to positions on the segment's surface which the light enters, the each diffractive optical element segment projecting, when the light enters, light having a phase distribution to form a light pattern, wherein the diffractive optical element segments are arranged on a same plane and have, on their surfaces, asperity shapes which are different from each other and correspond to respective light patterns different from each other, the light patterns being formed by light's entering the respective diffractive optical element segments, and wherein the diffractive optical element segments are arranged in respective regions on the diffractive optical element, which are partitioned by lines radially extending from a center of the diffractive optica

Abstract: A light pattern generator of the present disclosure includes: a laser light source to output laser light; a condenser lens to refract the laser light outputted from the laser light source; a mask to absorb or reflect part of the refracted light outputted from the condenser lens, the mask transmitting the rest of the refracted light; and a diffractive optical element to change a phase of the transmitted light in accordance with a position on a plane perpendicular to a direction in which the light transmitted through the mask travels and to output light having a phase distribution to form a light pattern, wherein the condenser lens is placed at a first position which is the condenser lens's focal length distant from the laser light source. This configuration makes it possible to form a plurality of types of light patterns by using a single diffractive optical element.

Abstract: An optical pattern generation device according to the present invention includes: a first laser light source for emitting first laser light; a first diffractive optical element for changing a phase of the first laser light depending on a position on a plane perpendicular to a propagating direction of the first laser light, and emitting laser light having a phase distribution; a second diffractive optical element for changing a phase of incident laser light depending on a position on a plane perpendicular to a propagating direction of the incident laser light, and emitting laser light for forming an optical pattern; and a transfer optical system disposed between the first and second diffractive optical elements, for transferring the phase distribution of the laser light emitted from the first diffractive optical element to a phase distribution of laser light incident on the second diffractive optical element.

Abstract: A lens (10) has an incidence surface (11) having a cylindrical shape and forming a concave shape, and an emitting surface (12) forming a convex shape with respect to an optical axis (10a). A light source (20) has a large divergence angle in a vertical direction, and a divergence angle in a horizontal direction which is smaller than that in the vertical direction. The light source (20) is located at a position of focal length of the lens (10) in the vertical direction on a side of the incidence surface. The horizontal direction of the light source (20) is aligned with a curvature direction of the cylindrical shape of the lens (10).

Abstract: There are provided: a planar waveguide in which claddings (2) and (3) each having a smaller refractive index than a laser medium for absorbing pump light (5) are bonded to an upper surface (1a) and a lower surface (1b) of a core (1) which is formed from the laser medium; pump light generation sources (4a) and (4b) for emitting pump light (5) to side surfaces (1c) and (1d) of the core (1); and laser light high reflection films (6a) and (6b) formed on side surfaces (1e) and (1f) of the core (1). Each of side surfaces (2e) and (2f) of the cladding (2) corresponding to the side surfaces (1e) and (1f) of the core (1) has a ridge structure (20) in which a part thereof is recessed.

Abstract: There are provided: a planar waveguide in which claddings (2) and (3) each having a smaller refractive index than a laser medium for absorbing pump light (5) are bonded to an upper surface (1a) and a lower surface (1b) of a core (1) which is formed from the laser medium; pump light generation sources (4a) and (4b) for emitting pump light (5) to side surfaces (1c) and (1d) of the core (1); and laser light high reflection films (6a) and (6b) formed on side surfaces (1e) and (1f) of the core (1). Each of side surfaces (2e) and (2f) of the cladding (2) corresponding to the side surfaces (1e) and (1f) of the core (1) has a ridge structure (20) in which a part thereof is recessed.

Abstract: A magnetic recording and reproducing apparatus capable of recording video, audio and other information on a magnetic tape by, for example, the helical scanning method. A rotary head is rotated at an m-fold speed to record intermittent tracks on the magnetic tape so that real-time simultaneous monitoring is performed. By high-speed dubbing due to high-density intermittent recording and by increasing the number of repetition of track scanning, the information is recorded and reproduced simultaneously with a plurality of channels. Any tracking error is detected to form a continuous and uniform track pattern. With this intermittent comb-shaped recording, reciprocating recording and reproducing can be realized.

Abstract: A magnetic recording and reproducing apparatus capable of recording video, audio and other information on a magnetic tape by, for example, the helical scanning method. A rotary head is rotated at an m-fold speed to record intermittent tracks on the magnetic tape so that real-time simultaneous monitoring is performed. By high-speed dubbing due to high-density intermittent recording and by increasing the number of repetition of track scanning, the information is recorded and reproduced simultaneously with a plurality of channels. Any tracking error is detected to form a continuous and uniform track pattern. With this intermittent comb-shaped recording, reciprocating recording and reproducing can be realized.