Electronic blackboard

An electronic print board comprising:

• a flat board having a background color and adapted for presentation thereon of an image in a different color;
• input means, including a single photoelectric conversion element, for converting reflected light from an image presented on said flat board or an image on an original document into an electrical signal;
• image converging and projecting means, including a variable focal length optical lens, for converging the reflected light from the image written on said flat board or from the image on the original document to provide on said single photoelectric conversion element in substantially equal sizes a projected image of the image on the original document or a projected image of the image on said flat board;
• recording means responsive to the electrical signal for recording the projected image;
• and
• flat board writing means responsive to the electrical signal for presenting on said flat board an image of the projected image.

An electronic print board comprising:

• a flat board having a background color and adapted for presentation thereon of an image in a different color;
• input means, including a single photoelectric conversion element, for converting reflected light from an image presented on said flat board or an image on an original document into an electrical signal;
• image converging and projecting means for illuminating said flat board and the original document and converging the reflected light from the image written on said flat board or from the image on the original document such that the optical path of the light illuminating and reflected by said flat board and the light illuminating and reflected by the original document is substantially the same, to provide on said single photoelectric conversion element a projected image of the image on the original document or a projected image of the image on said flat board;
• recording means responsive to the electrical signal for recording the projected image;
• and
• flat board writing means responsive to the electrical signal for presenting on said flat board an image of the projected image.

An electronic print board comprising:

• a flat board having a background color and adapted for presentation thereon of an image in a different color;
• input means, including a single photoelectric conversion element, for converting light projected thereon into an electrical signal;
• image converging and projecting means for simultaneously illuminating both said flat board and an original document and simultaneously converging both the reflected light from the image written on said flat board and the reflected light from an image on the original document such that the optical path of the light illuminating and reflected by said flat board and the optical path of the light illuminating and reflected by the original document are substantially different, to provide on said single photoelectric conversion element a combined projected image of the image on the original document and the image on said flat board;
• recording means responsive to the electrical signal for recording the combined projected image;
• flat board writing means responsive to the electrical signal for presenting on said flat board an image of the combined projected image;
• a communication unit for encoding, modulating and transmitting the electrical signal from said input means and for demodulating and decoding a received electrical signal to produce an image;
• an operation unit for entry of instructions to designate the operation of and activate said electronic print board;
• and
• a board control unit for controlling the operation of said electronic print board in accordance with instructions from said operation unit.

An electronic print board comprising:

• a flat board having a background color and adapted for presentation thereon of an image in a different color;
• input means, including a single photoelectric conversion element, for converting light projected thereon into an electrical signal;
• image converging and projecting means for simultaneously illuminating both said flat board and an original document and simultaneously converging both the reflected light from the image written on said flat board and the reflected light from an image on the original document such that the optical path of the light illuminating and reflected by said flat board and the optical path of the light illuminating and reflected by the original document are substantially different, to provide on said single photoelectric conversion element a combined projected image of the image on the original document and the image on said flat board;
• recording means responsive to the electrical signal for recording the combined projected image;
• flat board writing means responsive to the electrical signal for presenting on said flat board an image of the combined projected image;
• an editing unit for editing the electrical signal from said input means to provide an edited signal representative of an image different from the image of the electrical signal from said input means;
• an operation unit for entry of instructions to designate the operation of and activate said electronic print board;
• and
• a board control unit for controling the operation of said electronic print board in accordance with instructions from said operation unit.