Abstract: There are provided a light guide device that does not cause non-uniformity in image light and external light and does not cause ghosts, and a virtual image display apparatus provided with the light guide device. The light guide device includes a parallel light guide, an incident section, and an emission section. Here, the light guide device is set such that image light rays are reflected without reflecting from a boundary surface between the parallel light guide and the reflection unit and head for an observer. Thus, the image light rays only pass through half mirrors, which are positioned in positions where the image light rays are emitted from the reflection unit of the emission section or are positioned therearound. Accordingly, it is possible to prevent luminance non-uniformity or light reduction by reducing the number of times of the image light rays to be observed pass through the half mirrors.

Abstract: An image display device includes a display unit that displays an image so as to be visually recognized by an observer, a holding member that holds the display unit and has at least a portion thereof exposed to the outside, and a heat conduction member, having a sheet shape, which is connected to the holding member. The display unit includes an image forming device that forms the image. The heat conduction member comes into contact with the image forming device so as to be capable of heat conduction, and transmits heat of the image forming device to the holding member.

Abstract: First display elements and first ocular optical systems perform display in a first display region on a front side with respect to an observer, whereas second display elements and second ocular optical systems perform display in second display regions on peripheral sides with respect to the observer. Thus, a superimposed region of the display regions is provided in a position outside a central side of a person's visual field having an excellent information receiving capacity, and a wide angle of view is achieved while preventing the boundary from being visually identified. Further, the whole device is reduced in size and thickness by providing the plurality of display elements.

Abstract: A phosphor, combined with LED having not exceeding 470 nm, of high emission intensity and with chemical and thermal stability is provided. The phosphor according to the present invention comprises an inorganic compound in which element A (A is one or two or more kinds of elements selected from Mn, Ce, Pr, Nd, Sm, Eu, Tb, Dy, and Yb) is solid solved in an inorganic crystal including at least metal element M and non-metal element X and represented by MnXn+1 (3?n?5), an inorganic crystal having the same crystal structure, or an inorganic crystal including a solid solution thereof. Here, M comprises at least Al and Si, and if necessary element L (L is a metal element other than Al and Si) and X comprises N, O if necessary, and element Z if necessary (Z is a non-metal element other than N and O).

Abstract: An image display device includes a plurality of display elements configured to emit image light corresponding to a plurality of separate areas, and an ocular optical system configured to emit, to a position corresponding to an eye of an observer, the image light emitted from the plurality of display elements. The ocular optical system causes images to overlap with each other in a blending area including a boundary between the plurality of areas. An overlapping angle width in a direction orthogonal to the boundary of the blending area on a central visual field side is smaller than an overlapping angle width in the direction orthogonal to the boundary of the blending area on a peripheral visual field side.

Abstract: An eyepiece optical system is configured to emit image light that is emitted from a plurality of display elements and corresponds to a plurality of areas being divided, to a position corresponding to an eye of an observer, wherein a first optical member of a complex type disposed at a position closest to an emitting side corresponding to at least two areas of the plurality of areas has a first optical surface on the emitting side, and the first optical surface is expressed by one curvature.

Abstract: In a connection portion connecting a first reflective surface and a second reflective surface, the first reflective surface positioned relatively on an incidence side of video light is made to protrude toward an observer side beyond the second reflective surface positioned relatively on an emission side of video light, and a connection surface which is a surface of the connection portion is shaped to extend from a side close to the observer toward a side away from the observer between the first reflective surface and the second reflective surface.

Abstract: In a projection system, providing a stop that forms an opening that is symmetric with respect to a first flat plane including the projection system optical axis and a first axis that extends in parallel to the first direction and intersects the projection system optical axis but asymmetric with respect to a second flat surface including the projection system optical axis and a second axis that extends in parallel to the second direction and intersects the projection system optical axis allows appropriate light adjustment at the stop even when pencils of light from the points in a video device exit at different angles along a second direction, whereby high-quality video images can be provided with the size of an optical system further reduced and therefore the size of an overall virtual image display apparatus reduced.

Abstract: An eyepiece optical system is configured to form a non-telecentric optical system together with an image display unit serving as an image element, and to include the pixels in which a pixel in a peripheral region and the like on an image display has a larger size than a pixel in a central region on the image display. Accordingly, the central region that supports a wide angle of view and is of the image display on the image element having an effective field of view with a good performance of information capacity, makes it possible to retain image formation with high resolution, and to prevent an image from being degraded in the peripheral region, thus making it possible to ensure high-quality visibility.

Abstract: By configuring a micro structure portion, an image display device, and an eyepiece optical system to satisfy Expression (1), a diffusion effect of an appropriate extent can be imparted to image light with a relatively simple configuration, by taking into account the size of each of pixels constituting the image display device that is an image element, gaps between the pixels are made less noticeable, and a favorable state of visibility of an image can be obtained.

Abstract: A half mirror 21 provided in an optical path bends the optical path, and a semi-transmissive polarizing plate 23 increases the transmittance of image light GL in a direction along alignment of the eyes of an observer while the virtual image display device has a wide angle of view and is downsized, thus reducing luminance unevenness between the central region and the peripheral region in the image in the direction and allowing the observer to view a high quality image.

Abstract: By removing part of a lens effective diameter range in a cut lens, a lens is reduced in size and weight in an HMD that trends toward a larger device size. At this time, by making an area to be removed within the lens effective diameter range to be an area on a nose side, reductions in size and weight can be achieved while considering influence on image quality or fitting to a human face.

Abstract: Principal rays of component lights output from a periphery side of respective positions of an image surface generated in an image generation unit forming an image display device are controlled in an intensity distribution control unit so that the principal rays may be inclined more largely toward a center optical axis side than principal rays of component lights output from a center side and output, control is performed so that lights are output in the strongest intensity distributions with respect to axial directions of the principal rays of the respective component lights of image lights output in the respective positions by the intensity distribution control unit, and further, the positions can be adjusted by adjustment of output angles of the respective component lights in response to an aspect ratio of the image surface.

Abstract: Provided are a fluorescent material including a high light emission intensity and a light emitting device using the same. The present fluorescent material includes at least an A element, a M element, a D element, a E element, and an X element, wherein the A element is at least one element selected from the group consisting of Sr, Mg, Ca, and Ba; the M element is at least one element selected from the group consisting of Eu, Mn, Ce, Pr, Nd, Sm, Tb, Dy, and Yb; the D element is at least one element selected from the group consisting of Si, Ge, Sn, Ti, Zr, and Hf, the E element is at least one element selected from the group consisting of Al, B, Ga, In, Sc, Y, and La; the X element is at least one element selected from the group consisting of O, N, and F; and a molar ratio of the M element to the sum of the A element and the M element [M/(A+M)] is 0.06 or less.

Abstract: An image display device with which it is possible to visually recognize an image while securing the see-through property regardless of eye movements and changes in interpupillary distance, with which it is possible to display a large-size image with high quality, and which is small, has excellent wearability, and has an excellent external appearance.

Abstract: A half mirror layer has an angle dependency in which when an angle of incidence becomes larger than the angle of incidence range of image light, reflectance increases, such that it is possible to prevent unintended light, which is emitted to a light transmitting member from a light guiding member and is reflected inside a light transmitting member, from being returned to a Eight emission portion of the light guiding member after passing through the half mirror layer as a reflective film at a relatively large angle of incidence. Therefore, it is possible to prevent the image light passed through the light transmitting member from becoming ghost light while mitigating the demand for increasing processing accuracy of the light transmitting member, and bonding accuracy between the light guiding member and the light transmitting member, to provide a high quality virtual image displayed by a virtual image display device.

Abstract: A virtual image display apparatus includes an image projection apparatus that emits image light, and a display optical system that forms a virtual image according to the image light from a liquid crystal device (image forming device). The display optical system is configured by at least two members having different refractive indices and bends the image light a plurality of times between mediums having different refractive indices in a predetermined direction. A cumulative value of an index for chromatic dispersion with respect to the predetermined direction on a refractive surface of each bent portion is smaller than or equal to a predetermined reference value.

Abstract: In a frame part, a center portion having a thick structure is provided between a first optical member as a first light guide unit and a second optical member as a second light guide unit to connect to both and fixes relative positions of the first optical member and the second optical member by the center portion, and thereby, reduction in weight and size of the frame part is realized.

Abstract: An image display device with which it is possible to visually recognize an image while securing the see-through property regardless of eye movements and changes in interpupillary distance, with which it is possible to display a large-size image with high quality, and which is small, has excellent wearability, and has an excellent external appearance.

Abstract: There is provided a display apparatus including a light guide system that includes a light-incident portion including a light-incident curved surface on which image light beams as non-parallel light beams are incident and a light-reflective curved surface which reflects the image light beams such that the image light beams are converted into parallel light beams, and a light guide portion being a portion in which a plurality of partial reflection layers are disposed in parallel. The light guide portion is filled with a parallel light flux emitted from the light-incident portion. The light-incident portion is formed of a first transparent member, the portion in which the partial reflection layers are formed is formed of a second transparent member which is surface-bonded to the first transparent member via a bonding surface, and the bonding surface is inclined in the same direction as that of the partial reflection layer.