DISPLAY DEVICE

• Main Authors: USHIDA NORIHIKO, KOBAYASHI TETSUSHI, ISHIBASHI RYOICHI, ADACHI YOSHIKO
• Format: Patent
• Language: English; Japanese
• Published: 19.11.2015
• Subjects: ARRANGEMENT OR MOUNTING OF PLURAL DIVERSE PRIME-MOVERS INVEHICLES; ARRANGEMENT OR MOUNTING OF PROPULSION UNITS OR OFTRANSMISSIONS IN VEHICLES; ARRANGEMENTS IN CONNECTION WITH COOLING, AIR INTAKE, GASEXHAUST OR FUEL SUPPLY OF PROPULSION UNITS, IN VEHICLES; AUXILIARY DRIVES FOR VEHICLES; CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORSOR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER; ELECTRICITY; GENERATION; INSTRUMENTATION OR DASHBOARDS FOR VEHICLES; OPTICAL ELEMENTS, SYSTEMS, OR APPARATUS; OPTICS; PERFORMING OPERATIONS; PHYSICS; TRANSPORTING; VEHICLES IN GENERAL

PROBLEM TO BE SOLVED: To provide a display device capable of defining an origin (reference position) of a reflection unit which moves by a stepping motor without using a mechanical switch.SOLUTION: A display device comprises: a stepping motor 41; a concave mirror 31 which reflects the display light emitted by an indicator toward a windshield and moves according to the operation of the stepping motor 41; a lever unit 33 which moves together with the concave mirror 31; a drive unit which drives the stepping motor 41 by a micro-step drive system; a control unit which controls movement of the concave mirror 31 by controlling the drive unit; and a stopper unit 44 provided in a moving range of the lever unit 33. The drive unit includes a function to detect a counter-electromotive force generated in the stepping motor 41 when the lever unit 33 comes into contact with the stopper unit 44. The control unit defines a reference position when controlling the movement of the concave mirror 31 according to counter-electromotive force detection by the drive unit. 【課題】機械スイッチを用いずに、ステッピングモータによって移動する反射部の原点（基準位置）を定める。【解決手段】表示装置は、ステッピングモータ４１と、表示器が出射した表示光をフロントガラスに向けて反射させる凹面鏡３１であって、ステッピングモータ４１の動作に応じて移動する凹面鏡３１と、凹面鏡３１と共に移動するレバー部３３と、ステッピングモータ４１をマイクロステップ駆動方式で駆動する駆動部と、駆動部を制御することで、凹面鏡３１の移動を制御する制御部と、レバー部３３の移動範囲内に設けられたストッパー部４４と、を備える。駆動部は、レバー部３３がストッパー部４４に当接した際にステッピングモータ４１で生じる逆起電力を検出する機能を有する。制御部は、駆動部が逆起電力を検出したことに応じて、凹面鏡３１の移動を制御する際の基準位置を定める。【選択図】図３