Electrophotographic printer comprising an exposure energy correcting means for the optical character generator
First Claim
1. A non-mechanical printer means, comprising:
- image generating means for generating an image formed of individual points on a recording medium by use of a plurality of light-emitting elements of an optical character generator;
a correction means for automatically balancing the light-emitting elements by controlling a turn-on time of the light-emitting elements by calling in an individually correctable actuation time from a switching time memory means;
said correction means including photoelement means positioned for acquiring radiant intensity transmitted onto the recording medium by every light-emitting element given prescribed normal operation conditions and for supplying corresponding signals for each light-emitting element to a control means connected to control the light-emitting elements through said switching time memory means;
said control means allocating an individual activation time to each and every light-emitting element and storing the activation time in said switching time memory means for individually controlling each connected light-emitting element so that a same radiant energy is directed towards the recording medium by all light-emitting elements; and
a compensation means connected to all light-emitting elements for acquiring operating parameters of the image generating means and uniformly defining a common electrical opeating parameter for all light-emitting elements based upon said operating parameters.
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Accused Products
Abstract
An electrophotographic printer having an optical character generator and an exposure energy correcting means formed of a light-emitting diode strip for the optical character generator. Upon call-in of a balancing routing, an automatic balancing of the light-emitting elements occurs by use of a photoelement which acquires a radiant intensity transmitted onto the recording medium by every light-emitting element under prescribed normal operating conditions, and which supplies corresponding signals to a control means coupled to the light-emitting element. The control means then assigns every light-emitting element an individual actuation time and stores this in a switching time memory. Upon actuation, every light-emitting element thus supplies the same radiant energy to the recording medium.
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Citations
19 Claims
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1. A non-mechanical printer means, comprising:
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image generating means for generating an image formed of individual points on a recording medium by use of a plurality of light-emitting elements of an optical character generator; a correction means for automatically balancing the light-emitting elements by controlling a turn-on time of the light-emitting elements by calling in an individually correctable actuation time from a switching time memory means; said correction means including photoelement means positioned for acquiring radiant intensity transmitted onto the recording medium by every light-emitting element given prescribed normal operation conditions and for supplying corresponding signals for each light-emitting element to a control means connected to control the light-emitting elements through said switching time memory means; said control means allocating an individual activation time to each and every light-emitting element and storing the activation time in said switching time memory means for individually controlling each connected light-emitting element so that a same radiant energy is directed towards the recording medium by all light-emitting elements; and a compensation means connected to all light-emitting elements for acquiring operating parameters of the image generating means and uniformly defining a common electrical opeating parameter for all light-emitting elements based upon said operating parameters. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A non-mechanical printer means, comprising:
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a plurality of light-emitting elements arranged to form characters by radiating light onto a photoconductive surface; each light-emitting element being connected to a switching time memory means for storing a switching time determining an amount of time by which each of the light-emitting elements is individually activated; printer control means connected to each of the switching time memory means for activating the various light-emitting elements to create characters; photoconductive means for sensing a light intensity from at least some of the light-emitting elements and for outputting corresponding signals; said corresponding signals being connected to a control means for assigning individual actuation times to each of said corresponding signals corresponding to light radiating from said at least some light-emitting elements and for depositing the individual actuation times in each respective switching time memory means; and a compensation means connected in common to the light-emitting elements for acquiring operating parameters of the image generating means and uniformly defining a common electrical operating parameter for the light-emitting elements based upon said operating parameters. - View Dependent Claims (12, 13, 14, 15)
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16. A non-mechanical printer means, comprising:
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means for generating an image formed of individual points on a recording medium by use of a plurality of light-emitting elements of an optical character generator; a correction means for automatically balancing the light-emitting elements by controlling a turn-on time of the light-emitting elements and calling in an individually correctable actuation time from a switching time memory means; additional monitoring light-emitting elements being provided which are not employed for character formation; photoelement means positioned for acquiring radiant intensity transmitted from said monitoring light-emitting elements given prescribed normal operating conditions and for supplying corresponding signals to a control means connected to control the light-emitting elements through said switching time memory means; said control means allocating an individual activation time to every light-emitting element and storing the activation time in said switching time memory means for controlling a connected light-emitter element so that a same radiant energy is directed towards the recording medium; and said monitoring light-emitting elements being connected in parallel to at least some of said light-emitting elements employed for forming characters such that they are driven in common by a printer control means. - View Dependent Claims (17, 18)
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19. A non-mechanical printer means, comprising:
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a plurality of character generating light-emitting elements; a plurality of monitoring light-emitting elements; the character and monitoring light-emitting elements each connecting to respective switching time memory means for storing an actuation time; all of the switching time memory means associated with the character generating light-emitting elements connecting to a printer control means for actuating the character-generator light-emitting elements for character generation; the monitoring light-emitting elements being commonly connected to respective ones of said character generating switching time memories at said printer control means; a photoconductive drum arranged to receive radiant light from said character generating light-emitting elements; a photoconductive element arranged to receive radiant light from said monitoring light-emitting elements; and a control means connected to said photoelement for storing signals corresponding to the amount of radiant light received from the monitoring light-emitting elements and for assigning actuation times to said signals, and for forwarding said actuation times to said switching time memory means associated with said monitoring light-emitting elements and said character generating light-emitting elements.
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Specification