Copying apparatus having liquid crystal cells

An image forming apparatus comprising:

• a document table for placing a document to be copied thereon;
• first irradiating means for irradiating first light onto the document on the document table and reflecting the same;
• a drum including a hollow polyhedron cylinder of which facets have windows;
• a liquid crystal cell attached to each window of the drum for receiving image light on the one surface thereof to pick up a document image therein, and for receiving second light on the back surface thereof to cause the image to be read out;
• second irradiating means for irradiating second light onto the back surface of the liquid crystal cell and reflecting the same;
• drum driving means for rotating the drum so that the liquid crystal cell provided on each window of the drum can sequentially receive first light reflected by the document on the one surface thereof and second light irradiated by the second irradiating means on the back surface thereof;
• a photoreceptor for receiving second light reflected by the back surface of the liquid crystal cell to form an electrostatic latent image corresponding to a document image;
• developing means for developing the electrostatic latent image;
• transferring means for transferring the developed image onto a copy paper;
• and
• fixing means for fixing the transferred image,
• wherein the drum has an opening provided on one of sides for guiding second light, inwardly of the drum, from the second irradiating means to the back surface of the liquid crystal cell, and another opening provided on the other side for guiding light, outwardly of the drum, reflected by the back surface of the liquid crystal cell to the photoreceptor.

An image forming apparatus comprising:

• a document table for placing a document to be copied thereon;
• first irradiating means for irradiating first light onto the document on the document table and reflecting the same;
• a drum including a hollow polyhedron cylinder of which facets have windows;
• a liquid crystal cell attached to each window of the drum for receiving image light on the one surface thereof to pick up a document image therein, and for receiving second light on the back surface thereof to cause the image to be read out;
• second irradiating means for irradiating second light onto the back surface of the liquid crystal cell and reflecting the same;
• drum driving means for rotating the drum so that the liquid crystal cell provided on each window of the drum can sequentially receive first light reflected by the document on the one surface thereof and second light irradiated by the second irradiating means on the back surface thereof;
• a photoreceptor for receiving second light reflected by the back surface of the liquid crystal cell to form an electrostatic latent image corresponding to a document image;
• developing means for developing the electrostatic latent image;
• transferring means for transferring the developed image onto a copy paper;
• and
• fixing means for fixing the transferred image,
• further comprising conversion means for receiving the light reflected by the back of the liquid crystal cell so as to convert the image of the liquid crystal cell into an electric signal, and display means for receiving the output of the conversion means so as to display the image.