초록 ▼

A display apparatus has a light modulator with an electrooptical Pockels cell disposed in a machine room to modulate a laser beam with a modulating signal from a signal source as determined by a piece of image information to be displayed. After its passage through an optical fiber, the modulated las

A display apparatus has a light modulator with an electrooptical Pockels cell disposed in a machine room to modulate a laser beam with a modulating signal from a signal source as determined by a piece of image information to be displayed. After its passage through an optical fiber, the modulated laser beam enters an elevator car where it is focussed on a horizontal deflector by a diminishing lens and then reflected to be focussed on a vertical deflector by a collecting lens. The focussed laser beam is collected on an inner surface of an elevator door by an objective lens. Each deflector is a galvanometer mirror attached to a coil and horizontally or vertically deflecting the laser beam through an angle proportional to a saw tooth current flowing through the coil under the control of the signal source. This results in the display of the piece of image information on the inner surface of the elevator door.

대표청구항 ▼

An apparatus for displaying image information within an elevator car, comprising a projector disposed in an elevator car and formed of a light deflector, a diminishing lens disposed on an entrance side of said light deflector, and an objective lens disposed on an exit side thereof; a laser disposed

An apparatus for displaying image information within an elevator car, comprising a projector disposed in an elevator car and formed of a light deflector, a diminishing lens disposed on an entrance side of said light deflector, and an objective lens disposed on an exit side thereof; a laser disposed on a stationary part for an elevator system including the elevator car to form a light source for generating a light beam, a signal source disposed on said stationary part to generate a modulating signal as determined by a piece of image information to be displayed, a light modulator disposed on said stationary part to modulate said light beam from said light source with said modulating signal from said signal source; an optical fiber for leading said modulated light beam from said light modulator to said diminishing lens included in said projector, and a set of electrical conductors for connecting said signal source to said light deflector; the arrangement being such that the light beam deflected by said light deflector is focussed on an inner surface of said elevator car by means of said objective lens.