baber/WOPTO huggingface dataset:
Patent WO-2018142992-A1 (WO)
Title: 産業車両用遠隔操作システム、産業車両、遠隔操作装置、産業車両用遠隔操作プログラム及び産業車両用遠隔操作方法
Inventor: KAMIYA TOMONORI
IPC: B66F9/24
Filed: 2018-01-23
Abstract: 産業車両用遠隔操作システムは、車両通信ユニットを有するフォークリフトと、リモート通信ユニットを有し、フォークリフトを遠隔操作するのに用いられる遠隔操作装置とを備えている。産業車両用遠隔操作システムの車両無線ＣＰＵは、両通信ユニット間で無線通信が行われる遠隔操作信号の受信電波強度を把握し、その結果に基づいて、フォークリフトが許可範囲内に配置されているか禁止範囲内に配置されているかの可否判定を行う。
Patent WO-2019146120-A1 (WO)
Title: Solar cell, multijunction solar cell, solar cell module, and photovoltaic power generation system
Inventor: YAMAMOTO KAZUSHIGE
IPC: H01L31/072
Filed: 2018-01-29
Abstract: Provided are a solar cell having excellent conversion efficiency, a multijunction solar cell, a solar cell module, and a photovoltaic power generation system. The solar cell according to an embodiment of the present invention has a substrate (1), an n electrode (2), an n-type layer (3), a p-type light absorbing layer (4), i.e., an oxide semiconductor having Cu as a main component, and a p electrode (5). The n electrode (2) is disposed between the substrate (1) and the n-type layer (3). The n-type layer (3) is disposed between the n electrode (2) and the p-type light absorbing layer (4). A p-type light absorbing layer (4) is disposed between the n-type layer (3) and the p electrode (5). The n-type layer (3) is disposed further toward the light input side than the p-type light absorbing layer (4). The substrate (1) is a single substrate included in the solar cell.
Patent WO-2018143183-A1 (WO)
Title: 充電コネクタ用ロック装置、車両
Inventor: SAKURAI YUTA
IPC: H01R13/639
Filed: 2018-01-30
Abstract: 充電コネクタ用ロック装置１は、モータ４により回転される回転体５と、回転体５の周方向に沿って螺旋状に形成されたスロープ面５２ａを有するスロープ部５２と、回転体５を回転させた際に、一方の端部がスロープ面５２ａにガイドされることにより、軸方向に沿って突出位置と引込位置との間を進退移動し、突出位置に進出した際に他方の端部で充電コネクタ１０１をロックするロッド３と、を備え、スロープ部５２は、ロッド３を突出位置に保持する保持部５４を有する。
Patent WO-2018155385-A1 (WO)
Title: 硬質炭素膜とその製造方法および摺動部材
Inventor: OOSHIRO TAKEHIKO
IPC: C23C14/06
Filed: 2018-02-19
Abstract: ＭｏＤＴＣ含有潤滑油中で使用される摺動部材において、耐摩耗性や耐焼き付き性を維持しながら、アブレーシブ摩耗の発生を効果的に抑制すると共に、大幅に摩擦係数が低下された硬質炭素膜を、生産性を低下させることなくコストアップを招くことなく製造する硬質炭素膜の製造技術を提供する。　第１の硬質炭素膜の上に第２の硬質炭素膜が積層されて構成されており、第２の硬質炭素膜は第１の硬質炭素膜に比べて低硬度であり、第１の硬質炭素膜には第２の硬質炭素膜へ向けて突出するように隆起状形態物が複数形成されている硬質炭素膜。アークイオンプレーティング法を用いて表面に複数の隆起状形態物を成長させながら第１の硬質炭素膜を形成する工程と、ＣＶＤ法またはスパッタリング法を用いて第１の硬質炭素膜よりも低硬度の第２の硬質炭素膜を形成する工程とを含む硬質炭素膜の製造方法。
Patent WO-2019163075-A1 (WO)
Inventor: HAYASHIDA TETSURO
IPC: H01L29/06
Filed: 2018-02-23
Abstract: L'invention concerne un dispositif à semi-conducteur comprenant : un substrat de support ayant une première surface principale et une seconde surface principale ; une première couche de GaN d'un premier type de conductivité electrique disposée sur le premier côté de surface principale du substrat de support ; une seconde couche de GaN du premier type de conductivité électrique disposée sur la première couche de GaN ; une couche d'Al x Ga 1-x N (0 < x < 1) disposée sur la seconde couche de GaN ; une troisième couche de GaN d'un second type de conductivité électrique disposée sur la couche d'Al x Ga 1-x N (0 < x < 1) ; une quatrième couche de GaN du premier type de conductivité électrique disposée sur la troisième couche de GaN ; un film d'isolation recouvrant au moins la partie supérieure de la quatrième couche de GaN ; une grille de tranchée allant de la surface supérieure de la quatrième couche de GaN dans la seconde couche de GaN ; une électrode de grille disposée dans la grille de tranchée à travers un film d'isolation de grille ; une première électrode principale connectée à la troisième couche de GaN ; et une seconde électrode principale formant une paire avec la première électrode principale, la concentration de donneur dans la troisième couche de GaN étant inférieure à la concentration de donneur dans la quatrième couche de GaN.
Patent WO-2018230049-A1 (WO)
Title: 表示システム、映像処理装置、画素ずらし表示装置、映像処理方法、表示方法、及びプログラム
Inventor: NAKAGOSHI RYOSUKE
IPC: G03B21/14
Filed: 2018-02-27
Abstract: 本実施の形態にかかる映像処理装置（１４０）は、元映像に応じて、画素ずらし表示を行うか否かを判定する判定部（１４３）と、判定部（１４３）での判定結果に基づいて、画素ずらし表示のＯＮ／ＯＦＦと、画素ずらし表示ＯＮの場合の画素表示位置と、を示す制御信号を生成する制御信号生成部（１４５）と、判定部（１４３）での判定結果に基づいて、元映像から表示画像を生成する表示画像生成部（１４６）と、表示画像に制御信号を付加する付加部（１４７）と、を備えたものである。
Patent WO-2018186083-A1 (WO)
Title: 情報処理装置、情報処理システム及び情報処理方法
Inventor: SAKAMOTO TAKUYA
IPC: G06F21/62
Filed: 2018-03-05
Abstract: 【課題】ユーザに応じたデバイスのアクセス制御を行う。 【解決手段】利用要求受信部２０が、ユーザが利用可能なデバイス及び利用可能なデバイスの機能の登録を受け付けてアクセス管理ＤＢ３２に格納し、ＷｅｂＡＰＩ制御部４２は、登録に応じてＷｅｂＡＰＩを生成し、仮想デバイス制御部４０は、仮想デバイス機能部４６をＷｅｂＡＰＩへのアクセスに対してデバイスと連携して応答する仮想デバイスとして機能させる。そして、ＴＤ制御部４４は、ユーザ端末７０を利用したユーザ認証の結果に基づいて、認証したユーザに対応するＷｅｂＡＰＩへのアクセス方法を含むＴＤをユーザ端末７０に送信し、仮想デバイス機能部４６は、ユーザ端末７０からのＷｅｂＡＰＩへのアクセス（ＷｅｂＡＰＩ呼び出し）を受け付け、デバイスにアクセスする。
Patent WO-2018181871-A1 (WO)
Title: モジュール
Inventor: OTSUBO YOSHIHITO
IPC: H01L25/04
Filed: 2018-03-30
Abstract: 基板に実装された部品の使用時の温度上昇に伴う特性変動や部品に与える損傷を抑えることを目的とする。　モジュール１は、基板２と、基板２の一方主面２ａに実装された放熱対象である第１部品３と、第１部品３を封止する封止樹脂層６と、第１放熱部２１及び第２放熱部２２を有する放熱部材７とを備え、第１放熱部２１は、第１部品３の上面３ａに対して間隔を空けて封止樹脂層６に設けられた、一方主面２ａに垂直な方向から見た平面視において第１部品３の上面３ａに重なる第１重合部２５を有し、第２放熱部２２は、第１重合部２５の下面２５ｂ側から第１部品３の上面３ａに向かって第１部品３の上面３ａにまで延び、第１重合部２５の下面２５ｂを含む面における第２放熱部２２の面積が第１重合部２５の面積より小さい。
Patent WO-2018190175-A1 (WO)
Title: 光学積層体、偏光板、および画像表示装置
Inventor: HIRAOKA SHINYA
IPC: G02B5/30
Filed: 2018-04-02
Abstract: 表面処理層の機能が十分に付与された光学積層体を提供する。本発明の光学積層体は、基材フィルムと、基材フィルムの片側に形成された表面処理層と、を含み、基材フィルムが、アクリル系樹脂と、アクリル系樹脂に分散されたコアシェル型粒子と、を含み、基材フィルムの弾性率が４．０ＧＰａ以上であり、基材フィルム側から表面処理層の方向に３．０μｍの深さの位置を構成する成分のうち表面処理層に溶出したアクリル系樹脂の成分の割合が２０％未満である。
Patent WO-2018193894-A1 (WO)
Inventor: KANAMARU MASAMI
IPC: C08L23/10
Filed: 2018-04-09
Abstract: L'invention concerne une composition de résine à base de polypropylène comprenant : une résine (A) à base de polypropylène qui présente une fusion endothermique (ΔH-D) de 0 à 40 J/g et qui ne présente pas de point de fusion (Tm-D) ou qui présente un point de fusion (Tm-D) supérieur ou égal à 0 °C, mais inférieur à 90 °C ; et une résine (B) à base de polypropylène présentant une fusion endothermique (ΔH-D) supérieure à 40 J/g, mais inférieure ou égale à 125 J/g.
Patent WO-2018207525-A1 (WO)
Title: 基板処理装置および基板処理装置のメンテナンス方法
Inventor: NAKAI HITOSHI
IPC: H01L21/027
Filed: 2018-04-09
Abstract: 基板処理装置（１）の処理液供給部（５）は、処理液を吐出する。排液部（６０）は、処理液供給部（５）からの処理液をチャンバ（１１）の外部へと排出する。洗浄液供給部（６３）は、排液部（６０）に洗浄液を供給する。検出部（６４）は、排液部（６０）のメンテナンスの必要性の程度を示すメンテナンス必要度を、排液部（６０）から取得する。検出部（６４）により取得されたメンテナンス必要度が第１閾値以上かつ第２閾値未満である場合、制御部（７１）は、洗浄液供給部（６３）から排液部（６０）に洗浄液を供給させる。検出部（６４）により取得されたメンテナンス必要度が第２閾値以上である場合、制御部（７１）は警告信号を発する。これにより、排液部（６０）に汚れや詰まりが生じてメンテナンスが必要となった場合に、排液部（６０）のメンテナンスを自動的にかつ好適に行うことができる。
Patent WO-2019202665-A1 (WO)
Title: Optical communication device, control method, and control program
Inventor: SAITO KEN
IPC: H04L12/44
Filed: 2018-04-17
Abstract: An OLT (100) connects to an Internet network (20) and communicates with a DHCP server (400) that manages addresses to be used when connecting to the Internet network (20), and with an ONU (200) that communicates with a client device (300), which is not permitted to connect to the Internet network (20) via an address assigned by the DHCP server (400). The OLT (100) comprises: a message processing unit (112) that prompts the client device (300) for the transmission of an address acquisition request via the ONU (200) after it has been detected that the ONU, in which a malfunction has occurred, has recovered; and a monitoring unit (113) that monitors whether the client device (300) has transmitted the address acquisition request. The message processing unit (113) provides control such that the client device is connected to the Internet network (20) after the client device (300) has transmitted the address acquisition request.
Patent WO-2019207745-A1 (WO)
Title: Air conditioner
Inventor: KEZUKA YASUMASA
IPC: F24F13/20
Filed: 2018-04-26
Abstract: Provided is an air conditioner equipped with an outdoor unit configured such that water does not easily infiltrate, without increasing the number of parts. An air conditioner (1) is equipped with a side surface plate (114) forming a housing (110) of an outdoor unit (10), and a piping cover (120) attached so as to cover the side surface plate (114). The piping cover 120 has: contact surface sections (131) in surface contact with the side surface plate (114); grooves (132) that are provided in the contact surface sections (131), and that retain water which has infiltrated a gap between the side surface plate (114) and the contact surface sections (131) and enable the water to flow downward; and water drainage grooves (133) that guide water that has infiltrated the contact surface sections (131) to a lower space (139) separated from a first opening (114c) of the side surface plate (114).
Patent WO-2018207684-A1 (WO)
Inventor: MIYAKO IKUYASU
IPC: B60J7/057
Filed: 2018-05-01
Abstract: L'invention concerne un dispositif de fenêtre motorisée pour commander le mouvement de la vitre de fenêtre (2) installé dans un véhicule, lequel comprend : une unité de commande d'ouverture/de fermeture (60) pour exécuter une fonction de fermeture automatique pour fermer automatiquement la vitre de fenêtre (2); une unité de comptage (63) pour compter le nombre de fois qu'un moteur électrique (10) est actionné pour entraîner la vitre de fenêtre (2); et une unité de limitation de fonction (64) pour limiter la fonction de fermeture automatique sur la base du nombre de fois où le moteur électrique (10) a été actionné. L'unité de limitation de fonction (64) suspend la limitation de la fonction de fermeture automatique lorsque la vitre de fenêtre (2) est complètement fermée.
Patent WO-2019215869-A1 (WO)
Title: Control device for ablation treatment tool, ablation system, and ablation treatment method for ileal mucosa
Inventor: ITO RYOSUKE
IPC: A61B18/04
Filed: 2018-05-10
Abstract: This control device (7) for an ablation treatment tool (1) is provided with: a target value storage unit (11) which stores a target value for the total area of treatment; an energy source output unit (12) which outputs, to the ablation treatment tool (1), an energy source for executing ablation treatment; an area calculation unit (13) which calculates the total area of treatment of an ileal mucosa on which the ablation treatment was executed; and a control unit (14) which controls the termination of the ablation treatment by the ablation treatment tool (1). When the calculated total area of treatment of the ileal mucosa is equal to or greater than the target value, the control unit (14) notifies an operator of the termination of the ablation treatment or stops the output of the energy source from the energy source output unit (12).
Patent WO-2019220606-A1 (WO)
Title: Network node
Inventor: TOEDA TERUAKI
IPC: H04W28/06
Filed: 2018-05-17
Abstract: A network node, in a wireless communication system including user equipment and a plurality of network nodes, comprises: a reception unit that receives, from another network node or the user equipment, a protocol data unit related to a packet transmission that may have a length of multiple sequence numbers; an acquisition unit that acquires the sequence number of the protocol data unit related to the packet transmission; and a notification unit that performs a notification related to the packet transmission on the basis of the acquired sequence number.
Patent WO-2019049439-A1 (WO)
Title: Endoscope management device
Inventor: SAKAYORI HARUHIKO
IPC: G16H40/40
Filed: 2018-05-25
Abstract: An endoscope information recording unit 22 records in a master information storage unit 52 information relating to an endoscope that has not been stored in the master information storage unit 52. A usage information recording unit 24 records usage information relating to the endoscope in a usage history storage unit 54. A cleaning information recording unit 26 records cleaning information relating to the endoscope in a cleaning history storage unit 56. If, after the cleaning information recording unit 26 has recorded in the cleaning history storage unit 56 cleaning information indicating that cleaning of a first endoscope has been completed abnormally, the endoscope information recording unit 22 records information relating to a second endoscope in the master information storage unit 52, and either the usage information recording unit 24 records usage information relating to the first endoscope in the usage history storage unit 54 or the cleaning information recording unit 26 records the cleaning information relating to the first endoscope in the cleaning information storage unit 56, a substitute determining unit 30 determines that the second endoscope is a substitute for the first endoscope.
Patent WO-2019239520-A1 (WO)
Title: Heat exchanger, heat exchanger unit, and refrigeration cycle device
Inventor: YATSUYANAGI AKIRA
IPC: F28D1/053
Filed: 2018-06-13
Abstract: The purpose of the present invention is to obtain a heat exchanger, a heat exchanger unit, and a refrigeration cycle device in which heat exchange performance, drainage performance, and resistance to frost formation are improved. This heat exchanger is provided with a flat pipe and a plurality of fins formed from a plate-shaped body having a plate surface that extends in a lengthwise direction and in a width direction orthogonal to the lengthwise direction, said fins being arranged at intervals and such that the plate surfaces thereof intersect the pipe axis of the flat pipe. Each of the plurality of fins is provided with a first interval-maintaining section that is formed on the plate-shaped body and that is for maintaining the intervals. The flat pipe is arranged so that the major axis of a cross section perpendicular to the pipe axis is inclined at an inclination angle θ with respect to the width direction. The first interval-maintaining sections comprise a rising surface extending in a direction that intersects the plate surfaces, and the rising surfaces are inclined in the same direction as the inclination angle θ.
Patent WO-2018235913-A1 (WO)
Title: Measurement method, evaluation method, and measurement kit
Inventor: UEDA MASAYA
IPC: C12Q1/02
Filed: 2018-06-21
Abstract: Provided is a method for measuring changes in the accumulated amount of a biologically active substance that accumulates in the hair of a subject. A measurement method that includes: a collection step for collecting a hair sample from the same subject two or more times at intervals in time; and a measurement step for measuring the accumulated amount of a biologically active substance in at least a portion of each hair sample collected in the collection step.
Patent WO-2019026516-A1 (WO)
Title: Video distribution system
Inventor: OOHATA TAKAHIRO
IPC: H04N7/18
Filed: 2018-07-04
Abstract: A video distribution system (1) is provided with: an unmanned mobile object (11) comprising a photographing means and a position detection means; an operation device (12) capable of operating the unmanned mobile object; a communication device (13) connected to the operation device; a server device (20) capable of communicating with the communication device via a network; and a terminal device (30) capable of communicating with the server device via the network. The server device comprises an acquisition means (21) that (i) acquires video information obtained by photographing by the photographing means with the addition of time information, and (ii) acquires position information indicating the position of the unmanned mobile object detected by the position detection means with the addition of time information; and an association means (22) that associates the video information and the position information with each other on the basis of the time information added to the video information and the time information added to the position information.
Patent WO-2020008611-A1 (WO)
Title: Engine decompression device and engine
Inventor: NIO NAOTOSHI
IPC: F01L13/08
Filed: 2018-07-05
Abstract: This decompression device (50) has a decompression shaft (56) that is provided with: an engagement pin (53) which is guided by a guide groove (51a) provided in a decompression weight (51); a decompression cam (54) provided to a cam face of either an intake valve cam (25c) or an exhaust valve cam (25b) in such a manner as to be capable of advancing and retreating thereon; and a coupling part (55) which couples the engagement pin (53) and the decompression cam (54). The decompression weight (51) is provided with a rotation regulating groove (51e) which is disposed contiguously to the guide groove (51a) and which regulates the rotation of the decompression shaft (56) as the decompression shaft (56) is subjected to a force that moves the decompression cam (54) from an advance position to a retreat position when the engine (E) is stalled.
Patent WO-2020012657-A1 (WO)
Title: Simulator, injection device or imaging system comprising said simulator, and simulation program
Inventor: HIGAKI TORU
IPC: A61B6/03
Filed: 2018-07-13
Abstract: The present invention simulates a change over time of a pixel value in tissue of a subject if an injection protocol such as a protocol to maintain a target pixel value is used over a target duration time. This simulator comprises: a medicinal fluid information acquisition unit that acquires a contrast medium amount; a target value acquisition unit that acquires a target duration time of a target pixel value; a protocol acquisition unit that acquires an injection protocol of the contrast medium; and a prediction unit that, on the basis of the injection protocol and the contrast medium amount, simulates a change over time of a pixel value of tissue of a subject to obtain a predicted duration time. The prediction unit: compares the predicted duration time to the target duration time; if the predicted duration time is shorter than the target duration time, again obtains a predicted duration time by performing another simulation of the change over time if the contrast medium is injected in an amount greater than the use contrast medium amount used in the simulation; and if the predicted duration time is longer than the target duration time, again obtains a predicted duration time by performing another simulation of the change over time if the contrast medium is injected in an amount less than the use contrast medium amount used in the simulation.
Patent WO-2019123715-A1 (WO)
Title: Endoscope system, control device, control method, and program
Inventor: YANAGISAWA TEPPEI
IPC: A61B1/00
Filed: 2018-08-20
Abstract: Provided are an endoscope system capable of reliably driving an actuator. Also provided are a control device, a control method, and a program. This endoscope system is provided with: a power control unit (671) for causing power to be supplied at an initial drive voltage value to an actuator (22) for a predetermined time; a resistance value calculation unit (672) for calculating a synthetic resistance value that includes a resistance value of a transmission cable (3) and a resistance value of the actuator (22) on the basis of at least the magnitude of a drive signal detected by a detection unit (663); a drive voltage calculation unit (673) for calculating a drive voltage of the actuator (22) on the basis of the synthetic resistance value and a preset rated current value of the actuator (22); and a recording control unit (674) for recording the drive voltage calculated by the drive voltage calculation unit (673) in a scope recording unit (42).
Patent WO-2019049740-A1 (WO)
Title: Precursor structure of perpendicular magnetization film, perpendicular magnetization film structure and method for manufacturing same, perpendicular magnetization-type tunnel magnetoresistance junction film using those and method for manufacturing same, and perpendicular magnetization-type tunnel magnetoresistance junction element using those
Inventor: SUKEGAWA HIROAKI
IPC: H01L43/08
Filed: 2018-08-29
Abstract: By utilizing, as a basic configuration, a combination between MgAl2O4 and an alloy containing Fe as the main component, the present invention provides a perpendicular magnetization film structure having high interface-induced magnetic anisotropy. The perpendicular magnetization film structure (101) according to one embodiment of the present invention is characterized by being provided with: a substrate (2) having an alignment film of a cubic single crystal having the (001) plane or of a cubic or tetragonal system grown through the (001) plane; a foundation layer (3) which is located on the substrate and which is formed of a good conductor; a perpendicular magnetization layer (7) which is located on the foundation layer and which is formed of a product layer of an iron-based alloy containing aluminum as a composition material; and a non-magnetic layer (6) which is disposed on the perpendicular magnetization layer and which is an oxide having a spinel structure or a structure where the cation site in a spinel structure is disordered, and which has grown through the (001) plane.
Patent WO-2019176136-A1 (WO)
Inventor: ANDO Shotaro
IPC: G01N30/24
Filed: 2018-08-31
Abstract: 分析用装置で発生した廃液の廃液タンクまでの排出経路上に設けられた廃液受け部によって一旦、廃液を受ける。廃液受け部に隣接して流出液受け部を配置し、廃液受け部と流出液受け部を一定の高さの仕切りによって仕切り、流出液受け部に液センサを配置する。廃液の排出に異常が発生した場合、廃液受け部内に溜まった廃液が仕切りを越えて流出液受け部側へ流入し、液センサによって検知される。流出液受け部に廃液が流入するのは廃液の排出に異常が生じている場合だけであるので、液センサによって廃液の排出異常を検知することができる。
Patent WO-2020049625-A1 (WO)
Title: Control method and control device for hybrid vehicle
Inventor: ICHIHARA HIROKI
IPC: F02D15/02
Filed: 2018-09-04
Abstract: A series hybrid vehicle is disclosed that comprises a power generation motor generator (1), a power generation internal combustion engine (2), a travel motor generator (4), a battery (5), and an inverter device (6). The internal combustion engine (2) has a variable compression ratio mechanism (12). When the travel motor generator (4) is performing regenerative braking operation, if the charge state (SOC) of the inverter device (6) is at or above a prescribed level (SOC1), an electric actuator (46) of the variable compression ratio mechanism (12) is operated to cause high/low variation of the mechanical compression ratio and consume excess regenerative power.
Patent WO-2019049933-A1 (WO)
Title: Peptides inhibiting klk1, klk4, or klk4 and klk8
Inventor: NISHIMIYA DAISUKE
IPC: A61P9/02
Filed: 2018-09-06
Abstract: Provided are novel peptides. These peptides specifically inhibit activity of proteases which include an amino acid sequence expressed by SEQ ID NO: 23 and have a target molecule.
Patent WO-2020053937-A1 (WO)
Inventor: MARUYAMA NAOKI
IPC: C08G59/50
Filed: 2018-09-10
Abstract: エポキシ樹脂は、メソゲン構造を有するエポキシ化合物を含有し、硬化物としたときの２３℃における曲げ弾性率が３．０ＧＰａ以上、破壊靱性が１．０ＭＰａ・ｍ１／２以上、かつガラス転移温度が１５０℃以上である。
Patent WO-2019077939-A1 (WO)
Title: Virtual image display device
Inventor: YOKOE JUNYA
IPC: G02B27/01
Filed: 2018-09-21
Abstract: A HUD as a virtual image display device displays a virtual image so that an image is visible by projecting the image onto a projection screen. The HUD comprises: a polarizer (40) which reflects polarized light traveling in a first direction while transmitting polarized light traveling in a second direction perpendicular to the first direction; a liquid crystal display (20) that emits light for displaying an image toward the polarizer; a reflector (50) that reflects the display light, which is emitted from the liquid crystal display and transmitted through the polarizer, toward the polarizer again, to thus constitute a round-trip optical path (OP1) for causing the display light to travel to and from the polarizer; and a quarter-wave plate (60) provided on the round-trip optical path and changing the polarization direction of the display light so that the display light is guided to the projection screen via the polarizer on the return path. Thus, it is possible to improve the visibility of the virtual image.