Rear view mirror apparatus having roll-type filter means for automobile

摘要

A rear view mirror apparatus having roll-type filter means for automobile, capable of altering the brightness of image or capable of adding reference lines on the image, as required. This apparatus has, during the paths of light rays coming from an object to the eyes of the driver, a flexible ribbon of filter arranged for being freely reeled and unreeled as desired. This ribbon of filter is prepared so as to have portions of different transmittancies of light rays for different purposes and has reference lines printed on the surface of this ribbon. This apparatus is arranged so that the driver can have a view of the object through any desired portion of the flexible filter ribbon by reeling or unreeling this ribbon.