Ricoh Company, Ltd.

Shigenobu Hirano

Hiroyuki Takahashi

Tohru Yashiro

Satoshi Yamamoto

Yoshinori Okada

Koh Fujimura

Yasuo Katano

Toshiya Sagisaka

Mamiko Inoue

Kenji Kameyama

Ikue Kawashima

Tamotsu Horiuchi

Naoki Nakamura

Takashi Okada

Daisuke Goto

Masahiro Itoh

Yoshifumi Sudoh

Takashi Maki

Yukimichi Someya

Tsuneo Kurotori

Yuko Arizumi

Hidenori Tomono

Yuki Nakamura

Masamichi Yamada

Hiroshi Kondo

Masahiro Yanagisawa

Yukiko Abe

Tohru Hasegawa

Tsutomu Sato

Masaomi Sasaki

Kazukiyo Nagai

Hiroaki Kobayashi

Yoshihisa Naijo

Kazuaki Tsuji

Sukchan Kim

Keiichiroh Yutani

Takeshi Shibuya

Norikazu Igarashi

Aino Hasegawa

Susumu Momma

Akishige Murakami

Shun Okazaki

Fuminari Kaneko

Hidekazu Yaginuma

Satomi Tanaka

Shigeo Takeuchi

Keigo Takauji

Qing Liang

Atsushi Ohshima

Takahiko Matsumoto

Hitoshi Arita

Shiroh Ikegami

Yuuto Gotoh

Masahiro Masuzawa

Takuji Kato

Masato Shinoda

Kohji Takeuchi

Yuuma Usui

Kiyohiko Shinomiya

Shun Goto

Shiori Ohsugi

Takemasa Tsutsui

Satoshi Hayashi

Yousuke Manabe

Satoshi Uchida

Yoshitaka Sanehira

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.

Light guide and virtual-image display device

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

Light guide member and display device

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.

Propagation optical system and virtual image display device

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.

Virtual image display device

A head-mounted display device includes an image display unit () configured to emit image light, a light guide member () configured to guide the image light and emit the image light to eyes of a wearer who wears the head-mounted display device, and a relay optical system () arranged between the image display unit and the light guide member, and configured to relay the image light from the image display unit to the light guide member, and form an intermediate image at least once before the image light enters the light guide member.

Head-mounted display device containing relay optical system between image display unit and light guide member and display system

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.

Head-mounted display device with adjuster

To provide an electrochromic element, which contains: a first electrode; a second electrode; and an electrolyte provided between the first electrode and the second electrode, wherein the first electrode contains a polymer product obtained through polymerization of an electrochromic composition where the electrochromic composition contains a radical polymerizable compound containing triarylamine.

Electrochromic element and electrochromic dimming element

A display apparatus that enhances a response speed while suppressing reduction in durability even when the transmittance control is performed. The display apparatus includes a display, a plurality of light adjustment devices, and a controller. The display is configured to be attached to a head of a user to display information to the user. Each of the plurality of light adjustment devices is configured to change a transmittance to adjust an intensity of light incident from outside. The controller is configured to independently control the transmittances of the plurality of light adjustment devices separately from each other.

Display apparatus and display method

To provide an electrochromic compound, represented by the following general formula (I): where X, X, X, X, X, X, Xand Xare each independently a hydrogen atom or a monovalent substituent; Rand Rare each independently a monovalent substituent; Aand Bare each independently a monovalent anion; and Y is represented by the following general formula (II) or (III): where X, X, X, X, X, X, X, X, X, and Xare each independently a hydrogen atom or a monovalent substituent.

Electrochromic compound, electrochromic composition, and display element

To provide an electrochromic compound represented by the following general formula (1) where Xand Xare each independently a carbon atom or a nitrogen atom, R, Rand Rare each independently a halogen atom, a substituted or unsubstituted alkyl group, or a substituted or unsubstituted alkoxy group, x is an integer selected from 0 through 3, y and z are each independently an integer selected from 0 through 4, and at least one of Land Lis a monovalent functional group bonded to a nitrogen atom of a pyridinium ring directly, or via a divalent substituent. 

Electrochromic compound, electrochromic composition, electrochromic element, and electrochromic dimming element

A monocular image display device includes a virtual image former to display an image in front of one eye of a user and a primary light amount adjuster being in front of another eye of the user. The primary light amount adjuster is disposed closer to the one eye of the user than an optical axis of the another eye of the user is.

Monocular image display device

A management server communicable with a plurality of terminal devices, including a first terminal device, includes: a receiver to receive, from the first terminal device, shared information to be shared between the plurality of terminal devices, the shared information including first location information indicating a current location of the first terminal device, direction information indicating a direction that the first terminal device faces, and distance information indicating a distance from the first terminal device to a target destination; circuitry to generate target destination information including second location information indicating a location of the target destination based on the shared information received from the first terminal device; and a transmitter to transmit the target destination information to the plurality of terminal devices for display at the plurality of terminal devices.

Apparatus, system, and method of information sharing, and recording medium

To provide an electrochromic compound, represented by the following general formula where X, X, X, X, X, X, Xand Xare each independently a hydrogen atom or a monovalent substituent; Rand Rare each independently a monovalent substituent; Aand Bare each independently a monovalent anion; and Y is represented by the following general formula (II) or (III): where X, X, X, X, X, X, X, X, X, and Xare each independently a hydrogen atom or a monovalent substituent.

A head-mounted display apparatus () includes an image display part () configured to display an image, an optical unit () configured to lead the image to an eye of a wearer of the display apparatus (), a light intensity detector () configured to detect light intensity (A) of external light, a dimmer filter () configured to vary transmittance to adjust the intensity (B) of the external light reaching the eye of the wearer, and a controller () configured to adjust the transmittance of the dimmer filter () and the light intensity (C) of a light source of the image display part () based on the light intensity (A) of the external light obtained by the light intensity detector ().

Head-mounted display apparatus, and display method

An electrochromic dimming device is provided. The electrochromic dimming device includes an electrochromic element, a color development power source, a color discharge powder source, and a variable resistance. The color development power source supplies electric power to the electrochromic element when the electrochromic element develops color. The color discharge powder source supplies electric power to the electrochromic element when the electrochromic element discharges color. The variable resistance is disposed on a first current path without being disposed on a second current path. The first current path is formed from the color development power source through a ground via the electrochromic element, and the second current path is formed from the color discharge power source to the ground via the electrochromic element.

Electrochromic dimming device and electrochromic driving device

Growing community of inventors

Kanagawa, Japan

Shigenobu Hirano