Abstract: A display apparatus of the present disclosure includes: a left eyepiece display unit including a left-eye image display device and a left eyepiece optical system guiding a displayed left-eye display image to a left eye; and a right eyepiece display unit including a right-eye image display device and a right eyepiece optical system guiding a displayed right-eye display image to a right eye, and an image magnification upon observation by both eyes is twice or more. The left eyepiece optical system and the right eyepiece optical system each include a plurality of single lenses, and at least one of the single lenses is a free-form surface lens including a resin material. At least one of the single lenses is arranged in at least one of an eccentric state or a rotated state with respect to an optical axis of the left-eye image display device or the right-eye image display device.

Abstract: A virtual image display apparatus according to the present disclosure includes: a plurality of image forming elements (11 and 12); and a plurality of eyepiece optical systems (21 and 22). The plurality of image forming elements (11 and 12) includes a first image forming element (11) and a second image forming element (12). The first image forming element (11) outputs a first image to a front region in a visual field of a viewer. The second image forming element (12) outputs a second image to a peripheral region in the visual field of the viewer. The second image is different from the first image. The plurality of image forming elements (11 and 12) outputs a plurality of images to cause an image region of at least a portion of each of the plurality of images to overlap with the first image. The plurality of images includes the first and second images. The plurality of eyepiece optical systems (21 and 22) is provided in association with the plurality of respective image forming elements (11 and 12).

Abstract: An observation optical system according to the present invention includes a reflective optical device (30), a first lens group (10), and a second lens group (20). The reflective optical device (30) includes at least one reflection surface (31). The first lens group (10) is disposed at a position closer to an entrance pupil (E.P.) than the reflective optical device (30). The first lens group (10) forms an intermediate image (40) of a virtual image on the reflection surface (31) or at a position closer to the entrance pupil (E.P.) than the reflection surface (31). The intermediate image (40) of the virtual image corresponds to an image displayed on an image display unit (2). The second lens group (20) is disposed on an optical path after light passes through the first lens group (10), the intermediate image (40), and the reflective optical device (30) in order in a case where ray tracing is performed from an entrance pupil (E.P.) side.

Abstract: An eyepiece according to the present disclosure includes a first lens and a second lens that are opposed to each other. The first lens includes a first Fresnel lens surface formed at least in a peripheral region of a lens surface that is opposed to the second lens. The second lens includes a second Fresnel lens surface formed at least in a peripheral region of a lens surface that is opposed to the first lens.

Abstract: A display apparatus of the present disclosure includes an eyepiece display unit including an image display device and an eyepiece optical system that guides a display image displayed on the image display device to an eye point, in which an image magnification by the eyepiece optical system is twice or more, the eyepiece optical system is a coaxial system including a plurality of single lenses, at least one of the plurality of single lenses is an aspherical lens including a resin material, and the image display device displays, as the display image, an image for correction of distortion and chromatic aberration of magnification generated in the eyepiece optical system.

Abstract: A display apparatus of the present disclosure includes: a left eyepiece display unit including a left-eye image display device and a left eyepiece optical system guiding a displayed left-eye display image to a left eye; and a right eyepiece display unit including a right-eye image display device and a right eyepiece optical system guiding a displayed right-eye display image to a right eye, and an image magnification upon observation by both eyes is twice or more. The left eyepiece optical system and the right eyepiece optical system each include a plurality of single lenses, and at least one of the single lenses is a free-form surface lens including a resin material. At least one of the single lenses is arranged in at least one of an eccentric state or a rotated state with respect to an optical axis of the left-eye image display device or the right-eye image display device.

Abstract: The present invention provides foods and beverages comprising a combination of two or more digestion-resistant components. This invention also provides an agent for producing hydrogen gas in the large intestine, the agent comprising a combination of two or more digestion-resistant components. The foods and beverages or the agent for producing H2 in the large intestine according to this invention can induce sustained production of large amounts of hydrogen gas by intestinal bacteria of more human individuals.

Abstract: An electrical connecting device where electrical terminals are connected between two connector units by inserting the first connector unit into an insertion mouth of the second connector unit. Moreover, the electrical terminals of both units come into pressure contact by inserting the first connector unit into the second connector unit and then rotating the first connector unit in the direction almost at a right angle to the inserting direction. Such a structure is highly adaptable to an electrical connecting device where the first connector unit comprises a magnetic bubble memory unit, while the second connector unit comprises a holder unit for accommodating the bubble memory unit. This device realizes a stable and reliable electrical connection between both units with an excellent operability for insertion.