Importance

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Abstract

The prism reflector installed immediately above an indicator's display surface consists of a prism and a flange portion that is flush with one surface of the prism and which extends from the periphery of that surface. The surface of the prism and the flange portion form a reflecting surface. A reflector plate is arranged to face the reflecting surface of the prism reflector and has a concave surface, whose light axis is inclined with respect to the reflecting surface of the prism reflector toward the thicker side of the prism. Light from the indicator's display enters the prism, is refracted as it leaves the reflecting surface, and travels toward the reflector plate's concave surface, which reflects the incident light back toward the reflecting surface of the prism reflector, which then reflects it toward the driver's viewing point. Because the light travels back and forth between the reflecting surface and the reflector plate, a long light path is obtained for effective remote display while keeping the apparatus compact. The reflector plate's concave surface enlarges the indicator display image, so that a large virtual image can be formed at a remote location from the driver.

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First Claim