JP2003337209A5 - - Google Patents

Claims (20)

A diffuse reflector which reflects light and diffuses or collects light within a target range, and uses a surface relief type diffraction grating and a surface relief type hologram diffuser.   The surface relief type diffraction grating or surface relief type hologram diffuser of the diffuse reflector is characterized in that a grooved one surface is covered with a metal film or a dielectric having a refractive index of 1.6 or more in order to reflect light. The diffuse reflector according to claim 1.   3. The diffuse reflector according to claim 1, wherein a reflection type surface relief diffraction grating and a transmission type surface relief hologram diffuser are used. When laser light 10 mW in the visible wavelength region is reflected by a diffuser on the xy plane, a certain variable θ1, with respect to a unit direction vector S (Sx, Sy, Sz) of incident light with | S | = 1. There is θ2 (7 ° <θ1 or θ2 <40 °), the range of the incident angle Sx of the laser is | Sx | <sin (θ1), and the range of the incident angle Sy is | Sy | <sin (θ2). Optionally, when the reflected light in the direction perpendicular to the diffuser is observed, 40% of the incident light is uniformly scattered within the same solid angle range A (sr) as the incident angle range. diffuse reflector according to any one of claims 1 to 3 always high intensity Ri by the intensity of the light is obtained. When the direction vector of incident light is S _i (0, 0, 1) as a characteristic of a surface relief hologram diffuser used as a member of a diffuse reflector, certain variables θ1, θ2 (4 ° <θ1 <35 °; 90 °>θ2> θ1 × 1.5), and for unit direction vectors S (Sx, Sy, Sz) of transmitted light or reflected light, | Sx | <sin (θ1) and | Sy | <sin (θ2 90% or more of the incident light is transmitted or reflected in the angle range), and the peak half-value width θ1w of the angle distribution of transmitted or reflected light intensity in the X-axis direction is 3 ° <θ1w <20 °. 5. The diffuse reflector according to claim 1, wherein a hologram diffuser is used. When the direction vector of incident light is S _i (0, 0, 1) as a characteristic of the surface relief type diffraction grating used as a member of the diffuse reflector, certain variables θ1, θ2 (4 ° <θ1 <35 °; 90 ° >Θ2> θ1 × 1.5) and the unit direction vector S (Sx, Sy, Sz) of the scattered light is in an angular range of | Sx | <sin (θ1) and | Sy | <sin (θ2). The diffuse reflector according to any one of claims 1 to 4, wherein a surface relief type diffraction grating in which 90% or more incident light enters is used.   7. The diffuse reflector according to claim 1, wherein a surface relief type diffraction grating and a surface relief type hologram diffuser are laminated.   7. The diffuse reflector according to claim 1, wherein a surface relief type diffraction grating and a surface relief type hologram diffuser are formed on both front and back surfaces.   7. The diffuse reflector according to claim 1, wherein the surface relief type diffraction grating and the surface relief type hologram diffuser are produced on the same surface.   Use a surface relief hologram diffuser with a controlled angle range of scattered light, which is exposed to a photosensitive material by a laser through a mask diffuser hole consisting of a hole and a diffuser to create an illumination pattern The diffusive reflector according to any one of claims 1 to 9, wherein   The diffuse reflector according to any one of claims 1 to 10, wherein the surface relief type diffraction grating is laminated so that the directions of the grating grooves are non-parallel.   The diffuse reflector according to any one of claims 1 to 10, characterized in that the grating grooves of the surface relief type diffraction grating are arranged vertically and horizontally on the same surface or front and back surfaces.   The diffuse reflector according to any one of claims 9 to 12, wherein the lamination of the surface relief type hologram diffuser is bonded through an adhesive layer.   The diffuse reflector according to any one of claims 9 to 12, wherein the lamination of the surface relief hologram diffuser sandwiches a spacer.   The diffuse reflector according to any one of claims 12 to 14, wherein the surface relief hologram diffuser has a surface relief hologram transferred from a transfer roll mold.   The diffuse reflector according to claim 15, wherein the surface relief hologram diffuser uses a UV curable resin as a material of the surface relief hologram.   The diffuse reflector according to claim 15, wherein the surface relief hologram diffuser uses a thermoplastic resin as a material of the surface relief hologram.   18. A reflective liquid crystal display device using the diffuse reflector according to claim 1 as a diffuse reflector.   The member for lighting equipment which used the diffuse reflection board in any one of Claim 1 thru | or 17 as a diffuse reflection board.   An optical communication member using the diffuse reflector according to any one of claims 1 to 17 as a diffuse reflector.