Abstract: An optical device is provided which does not need a collimate lens, and which has a high available efficiency of light. The optical device includes a light source unit 1 emitting light with a wavelength ?, and an optical element 2 with a concavo-convex structure including periodical lenses. When n is a natural number equal to or greater than 1, and the size of a k-th (where k is a natural number equal to or greater than 1) pitch from the smallest one among the pitches of the concavo-convex structure is Pk, a distance L1 between the light source unit and the optical element satisfies the following formula 1 for equal to or greater than any one pitch Pk. ( n - 0 . 1 ) ? P k 2 2 ? ? ? L 1 ? ( n + 0 .

Abstract: A lens and an optical system device are provided which can measure optical characteristics of a light source or an optical element with a simple structure. A lens 1 has an optical axis, and includes an incident surface F and an emit surface B. The incident surface F and the emit surface B are formed so as to emit incident light to the incident surface F from a first position O at an irradiation angle ? relative to the optical axis from the emit surface B at an emit angle ?/m (where m>1) relative to the optical axis by refraction at the incident surface F and at the emit surface B, and formed in such a way that apparent positions of lights emitted from the emit surface B all begin from a second position P. Moreover, an optical system device includes the lens 1 and a diffuser panel that diffuses emitted light from the lens 1.

Abstract: A semiconductor light emitting device includes a light extraction layer having a light extraction surface. The light extraction layer includes: a plurality of cone-shaped parts formed in an array on the light extraction surface, and a plurality of granular parts formed both on a side part of the cone-shaped part and in a space between adjacent cone-shaped parts. A method of manufacturing the semiconductor light emitting device includes: forming a mask having an array pattern on the light extraction layer; and etching the mask and the light extraction layer from above the mask. The etching includes first dry-etching performed until an entirety of the mask is removed and second dry-etching performed to further dry-etch the light extraction layer after the mask is removed.

Abstract: A semiconductor light emitting device includes a light extraction layer having a light extraction surface. Multiple cone-shaped parts formed in an array are provided on the light extraction surface of the semiconductor light emitting device. A proportion of an area occupied by the multiple cone-shaped parts per a unit area of the light extraction surface is not less than 65% and not more than 95% in a plan view of the light extraction surface, and an aspect ratio h/p defined as a proportion of a height h of the cone-shaped part relative to a distance p between apexes of adjacent cone-shaped parts is not less than 0.3 and not more than 1.0.

Abstract: A semiconductor light emitting device includes a light extraction layer having a light extraction surface. Multiple cone-shaped parts formed in an array are provided on the light extraction surface. The cone-shaped part has a first portion having a first angle of inclination of a side surface and a second portion having a second angle of inclination of a side surface smaller than the first angle. The second portion is closer to an apex of the cone-shaped part than the first portion and has a larger height than the first portion.

Abstract: An optical element with which it is possible to control not only the light emission direction but also the illuminance, and an optical system device in which the optical element is used. An optical element having at least a part of a rotation body obtained by rotating a reference planar shape for converting light from a prescribed location into light that is parallel with a prescribed direction, or a parallel translation body obtained by performing a parallel translation on the reference planar shape, wherein: the reference planar shape has an illuminance adjustment part and an emission direction adjustment part; the illuminance adjustment part is shaped so as to convert the direction of light entering from the prescribed location so that the illuminance at the emission direction adjustment part is uniform; and the emission direction adjustment part is shaped so as to convert the direction of light to the prescribed direction by refraction.

Abstract: An optical device including at least a part of a rotation body acquired by rotating a reference plane shape or a parallelly shifted body acquired by parallelly shifting the reference plane shape, the reference plane shape including an incidence portion allowing light from a predetermined site to enter, an emit portion that reflects the light which has traveled through the incidence portion and which is directly irradiated and a first reflection portion that reflects the reflected light by the emit portion toward the emit portion. The reference plane shape may include a second reflection portion that reflects the light which has traveled through the incidence portion and which is directly irradiated to the emit portion. An optical system apparatus includes a light source placed at the predetermined site.

Abstract: A semiconductor light emitting device includes a light extraction layer having a light extraction surface. Multiple cone-shaped parts formed in an array are provided on the light extraction surface of the semiconductor light emitting device. A proportion of an area occupied by the multiple cone-shaped parts per a unit area of the light extraction surface is not less than 65% and not more than 95% in a plan view of the light extraction surface, and an aspect ratio h/p defined as a proportion of a height h of the cone-shaped part relative to a distance p between apexes of adjacent cone-shaped parts is not less than 0.3 and not more than 1.0.

Abstract: A semiconductor light emitting device includes a light extraction layer having a light extraction surface. Multiple cone-shaped parts formed in an array are provided on the light extraction surface. The cone-shaped part has a first portion having a first angle of inclination of a side surface and a second portion having a second angle of inclination of a side surface smaller than the first angle. The second portion is closer to an apex of the cone-shaped part than the first portion and has a larger height than the first portion.

Abstract: An optical device which can be easily manufactured and which is capable of guiding light to a forward widespread range without waste, and an optical system apparatus that utilizes the same. The optical device controls a light distribution of entering light from a predetermined site and emits the controlled light, and includes a reflection utilizing portion that includes a plurality of convex structures each including an incidence surface allowing the light from the predetermined site to travel therethrough, and a reflection surface reflecting the traveling light through the incidence surface in a predetermined direction, and an emit surface that emits that emits the reflected light by the reflection surface in a predetermine light distribution direction.

Abstract: An optical device including at least a part of a rotation body acquired by rotating a reference plane shape or a parallelly shifted body acquired by parallelly shifting the reference plane shape, the reference plane shape including an incidence portion allowing light from a predetermined site to enter, an emit portion that reflects the light which has traveled through the incidence portion and which is directly irradiated and a first reflection portion that reflects the reflected light by the emit portion toward the emit portion. The reference plane shape may include a second reflection portion that reflects the light which has traveled through the incidence portion and which is directly irradiated to the emit portion. An optical system apparatus includes a light source placed at the predetermined site.

Abstract: A semiconductor light emitting device includes a light extraction layer having a light extraction surface. The light extraction layer includes: a plurality of cone-shaped parts formed in an array on the light extraction surface, and a plurality of granular parts formed both on a side part of the cone-shaped part and in a space between adjacent cone-shaped parts. A method of manufacturing the semiconductor light emitting device includes: forming a mask having an array pattern on the light extraction layer; and etching the mask and the light extraction layer from above the mask. The etching includes first dry-etching performed until an entirety of the mask is removed and second dry-etching performed to further dry-etch the light extraction layer after the mask is removed.

Abstract: An optical image formation apparatus which has a high brightness of an actual image, easy for manufacturing, and reduces costs. This optical image formation apparatus mainly includes a polarizer causing P polarization light to pass through, and reflecting S polarization light, a phase difference element converting either one of or both of the P polarization light having passed through the polarizer or the S polarization light reflected by the polarizer into circular polarization light or elliptical polarization light, and a recursive light reflector recursively reflecting the light having passed through the phase difference element.

Abstract: An optical element which is capable of improving the degree of transmission of electromagnetic waves, and which does not require positioning; a light emitting element; an optical device which uses this light emitting element; and a method for producing this optical element.

Abstract: A light emitting device that includes a concavo-convex structure mainly utilizing the diffraction effect rather than the scattering effect of light, thereby improving the light extraction efficiency. A light emitting device includes a laminated part where a semiconductor layer including a light emitting layer is laminated, and a diffraction surface comprising a concavo-convex structure which is formed at a boundary of any layer in the laminated part, and which reflects incident light emitted by the light emitting layer in accordance with a Bragg's diffraction condition. The concavo-convex structure is formed in such a way that an inclination of a side wall of a convexity relative to the diffraction surface is greater than 75 degrees.

Abstract: An anti-reflective object that can sufficiently mitigate reflection of light. An anti-reflective structure is configured such that, on a surface of a base material made of a material that absorbs light of a prescribed wavelength for which the prevention of reflection is desired, a rough structure for preventing reflection is formed. The rough structure satisfies P>6?, and preferably P?6?, when the wavelength of light is ? and the average pitch of the rough structure is P. Also, it is preferable that the rough structure satisfy H/P?1 when the average depth of the rough structure is H.

Abstract: An optical component capable of sufficiently reducing reflection of light by controlling a change in refractive index, even if incident angle of light varies. An optical component includes a base, a moth-eye structure with predetermined concavities and convexities, and at least one buffer layer provided between the base and the moth-eye structure. A change in refractive index between the base and a medium is adjusted by the buffer layer and the moth-eye structure.

Abstract: An optical component capable of sufficiently suppressing a reflection even if the incident angle of a light source changes with a line direction being as a rotation axis in a reflection suppressing structure in a line-and-space shape. The optical component includes a base having a function as an optical component, and a reflection suppressing structure in a line-and-space shape formed on a surface of the base, and including a plurality of sequential concavities and convexities defining a convex shape in a cross-sectional view. When a position of a mid-point of a bottom side of the convex shape is an origin, the bottom side is y-axis, a height direction relative to the bottom side is x-axis, a width of the bottom side of the convex shape is P, a height of the convex shape is H, r=0.

Abstract: An optical component capable of sufficiently reducing reflection of light by controlling a change in refractive index, even if incident angle of light varies. An optical component includes a base, a moth-eye structure with predetermined concavities and convexities, and at least one buffer layer provided between the base and the moth-eye structure. A change in refractive index between the base and a medium is adjusted by the buffer layer and the moth-eye structure.