Process and apparatus for high speed laser printing using a roller having a convertible structure
First Claim
1. A laser printing process using a rotary light sensitive roller electrically charged by points of a laser beam and intended for receiving particles of a toner powder onto the charged points and then transferring the particles onto a band to be printed, which comprises:
- a first step wherein the image to be printed is stored, by a first laser beam coming from a first laser source controlled by a computer, onto a rotary memory roller whose surface is covered with a layer of a convertible material assuming either an amorphous or a crystalline structure under the action of a laser beam, and said convertible material showing a high difference in reflecting ability according to whether it assumes the amorphous structure or the crystalline structure; and
a second step wherein the thus stored image is transferred, by means of the optical reflection of a second laser beam coming from a second laser source having in its whole a linear character, onto the light sensitive roller intended to receive the toner and to transfer the image onto the band to be printed.
2 Assignments
0 Petitions
Accused Products
Abstract
A laser printing process using a rotary light sensitive roller electrically charged by points by a laser beam and intended for receiving onto the charged points particles of a toner powder and then transferring the same onto a band to be printed, includes a first step wherein the image to be printed is stored, by a first laser beam coming from a first laser source controlled by a computer, onto a rotary memory roller whose surface is covered with a layer of a material capable of assuming either an amorphous or a crystalline structure, this structure being convertible under the action of a laser beam, and this material showing a high difference in reflecting ability according to whether it assumes the one or the other of its structures, and includes a second step wherein the thus stored image is transferred, by the optical reflection of a second laser beam coming from a second laser source having in its whole a linear character, onto the light sensitive roller intended to receive the toner and to transfer the image onto the band to be printed.
3 Citations
12 Claims
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1. A laser printing process using a rotary light sensitive roller electrically charged by points of a laser beam and intended for receiving particles of a toner powder onto the charged points and then transferring the particles onto a band to be printed, which comprises:
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a first step wherein the image to be printed is stored, by a first laser beam coming from a first laser source controlled by a computer, onto a rotary memory roller whose surface is covered with a layer of a convertible material assuming either an amorphous or a crystalline structure under the action of a laser beam, and said convertible material showing a high difference in reflecting ability according to whether it assumes the amorphous structure or the crystalline structure; and
a second step wherein the thus stored image is transferred, by means of the optical reflection of a second laser beam coming from a second laser source having in its whole a linear character, onto the light sensitive roller intended to receive the toner and to transfer the image onto the band to be printed.
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2. An apparatus for carrying out a laser printing process, comprising:
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a rotary light sensitive roller;
a means for rotating said light sensitive roller;
a toner distributing means co-operating with said light sensitive roller, means for advancing a band along a trajectory to co-operate with said rotary light sensitive roller in order to be printed;
a rotary memory roller;
a means for rotating said memory roller;
a layer of a memory material covering a surface of said rotary memory roller, said memory material being convertible into either an amorphous or a crystalline structure under the action of a laser beam, and said memory material showing a high difference in reflecting ability according to whether it assumes the one or the other of said structures;
a first laser beam emitting device including a first laser source;
a computer controlling said first laser source and a first optical system arranged for forming onto said rctary memory roller an image to be printed;
a transfer device including a second laser source of a second laser beam, which is linear in its whole, a second optical system arranged for focusing said second laser beam onto a generatrix of said rotary memory roller, from which they are reflected; and
a third optical system arranged for projecting onto a generatrix of said light sensitive roller the laser beams reflected by said generatrix of said rotary memory roller onto which said second laser beam has been focused. - View Dependent Claims (3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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Specification