Abstract: A light guide member (300) includes a boundary surface (304) configured to reflect image light guided to the boundary surface (304) and emit the image light outside the light guide member (300), an opposing surface (306) parallel to the boundary surface (304), the opposing surface (306) facing the boundary surface (304), a first inclined surface (305) having an inclination in which a distance between the first inclined surface (305) and the boundary surface (304) decreases in a guiding direction of the image light, and a second inclined surface (307) between the opposing surface (306) and the first inclined surface (305), the second inclined surface (307) inclined at a different angle with the first inclined surface (305) in the guiding direction.

Abstract: A head-mounted display device includes a display element to display an image; a light guide member to emit the image displayed on the display element to an eye of a wearer; a housing including an optical system to guide image light of the image displayed on the display element to the light guide member; and an adjustment member provided on a side of the light guide member opposite to the optical system, and to bend the housing on a side opposite to a face of the wearer.

Abstract: A light guide includes light guiding members including first and second light guiding members, an optical entrance having a plane on which the light is incident, a light guiding unit to guide the light incident on the optical entrance with repeated reflection, a light beam ejection unit to eject the light to an outside of the light guide, and an extraction unit to reflect the light guided by the light guiding unit toward the light beam ejection unit. The light guiding members guide and eject a light, and the second light guiding member is bonded to, at least, the light guiding unit of the first light guiding member.

Abstract: A light irradiation device includes a first illumination optical system to emit first light that causes a chemical reaction on an object; a second illumination optical system to emit second light having a wavelength different from a wavelength of the first light; a light emitter to emit the first light from the first illumination optical system and the second light from the second illumination optical system to the object in space shared by the first light and the second light, to irradiate an irradiation area on the object; an image-capturing optical system to capture an image of the space including the object; and circuitry configured to: detect a state of the irradiation area based on the image captured by the image-capturing optical system; and control at least one of the first light and the second light based on the detected state.

Abstract: A lens unit includes: a lens group including: an object-side lens closest to an object side in the lens group; an image-side lens closest to an image side in the lens group; and an intermediate lens between the object-side lens and the image-side lens, the object-side lens, the image-side lens, and the intermediate lens being arranged along an optical axis; a first holder holding an edge surface of the object-side lens and an edge surface of the intermediate lens; and a second holder separate from the first holder, the second holder holding the edge surface of the intermediate lens and an edge surface of the image-side lens.

Abstract: A virtual image display device includes: an image display element that displays an image to be displayed as a virtual image; a propagation optical system that propagates light from the image display element; and a light guide member that guides the light propagated by the propagation optical system. The light guide member includes: a light beam incident part that introduces light including image information from the propagation optical system into the light guide member; an image extractor that extracts the light including image information from an inside of the light guide member; and an image emitter that emits the light including image information to an outside of the light guide member. The propagation optical system includes one or more optical members each having a curved surface shape that is non-rotationally symmetric with respect to an optical axis.

Abstract: A propagation optical system includes: a first optical system; an intermediate optical element; and a second optical system. The first optical system, the intermediate optical element, and the second optical system being sequentially arranged in a direction from the image display element toward the light guide member along an optical axis. The intermediate optical element has a non-rotationally symmetric curved surface, of which shape is non-rotationally symmetric about the optical axis. A cross-sectional shape, of the non-rotationally symmetric curved surface, in a first plane including the optical axis is non-arc shape. The first plane is a plane in which the non-rotationally symmetric surface has a strongest positive power among planes including the optical axis. The propagation optical system is configured to form, between the first optical system and the second optical system, an intermediate image corresponding to an image displayed on the image display element.

Abstract: A thermal actuator unit of the present invention includes a first member, a second member, an elastic part which is disposed between the first member and the second member, and a thermal deformation part which is disposed on a side of the first member opposite to a side with the second member and has a shape-memory alloy to be deformed to the side with the second member due to heat.

Abstract: A head-mounted display device includes a display element to display an image; a light guide member to emit the image displayed on the display element to an eye of a wearer; a housing including an optical system to guide image light of the image displayed on the display element to the light guide member; and an adjustment member provided on a side of the light guide member opposite to the optical system, and to bend the housing on a side opposite to a face of the wearer.

Abstract: A thermal actuator unit of the present invention includes a first member, a second member, an elastic part which is disposed between the first member and the second member, and a thermal deformation part which is disposed on a side of the first member opposite to a side with the second member and has a shape-memory alloy to be deformed to the side with the second member due to heat.