Optical head of optical beacon

Details Optical head of optical beacon Optical head of optical beacon

1997-05-28

1999-12-07

Chan, Jason

Optical: systems and elements

Deflection using a moving element

Using a periodically moving element

359142, 359143, 359152, 359155, 359154, 340461, H04B 1000, B60Q 100

Patent

active

059992964

ABSTRACT:
In an optical head for optical beacon, a prism 5 is arranged immediately after light emitting elements 1 of an optical head 10 in light radiating directions of the light emitting elements 1, so that the paths along which light rays travel immediately after the radiation can be curved by the prism 5. As a result of this configuration, if the index of refraction of a material of which the prism 5 is made and the angle of a slope of the prism 5 are set to proper values, the light rays can be injected from the prism 5 to an optical head 10 on the side of a light receiving element 2 in arbitrary directions. Further, a surface 21 of a body 13 in which a transmission window 14 is formed is so shaped as to be inclined backward with respect to the travelling direction of an automobile from an upper edge a to a lower edge b. An image of the surface 21 of the body 13 in which the transmission window 14 is formed is not mirrored on a windshield glass 20 as long as the image is that of a surface portion below the upper edge a excluding the upper edge a. Other part of the body 13 than the surface 21 in which the transmission window 14 is formed is subjected to a surface treatment for preventing the mirroring of an image.

REFERENCES:
patent: 4325146 (1982-04-01), Lennington
patent: 5073979 (1991-12-01), Webb
patent: 5117301 (1992-05-01), Tsumura
patent: 5357361 (1994-10-01), Nishizawa
patent: 5416627 (1995-05-01), Wilmoth

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