초록 ▼

A light projection device suitable for use on aircraft instruement panels includes a light source contained within a housing. The housing is mounted to the instrument panel adjacent a gauge to be illuminated. The housing has an extension thereon which projects toward the adjacent gauge, and through

A light projection device suitable for use on aircraft instruement panels includes a light source contained within a housing. The housing is mounted to the instrument panel adjacent a gauge to be illuminated. The housing has an extension thereon which projects toward the adjacent gauge, and through which light is projected. Contained within the housing extension is a light redirection device having a graded transmissibility function. The graded transmissibility of this redirection device causes a higher proportion of light projected from the device to be directed to the far side of the gauge. This graded transmissibility function provides for more even illumination over the surface of the gauge. The graded light redirection device may be, for example, a Fresnel lens having selected optical properties.

대표청구항 ▼

A light projection device for illuminating a substantially planar surface, comprising: a housing extending substantially perpendicular to the plane of the surface, and located adjacent said surface; a housing extension connected to said housing, said extension extending toward the planar surface and

A light projection device for illuminating a substantially planar surface, comprising: a housing extending substantially perpendicular to the plane of the surface, and located adjacent said surface; a housing extension connected to said housing, said extension extending toward the planar surface and having an opening for transmitting light; a light source located within said housing near its junction with said housing extension; and a Fresnel lens mounted in said housing extension adjacent the opening for directing light emitted by said source toward the planar surface, said Fresnel lens having a graded transmission function, wherein more light is transmitted at angles directed toward farther regions of the surface, and less light is transmitted at angles directed toward closer regions of the surface, whereby a relatively even level of illumination is achieved over the surface.