Resources Contact Us Home
Gradation control circuit of line thermal printer

Image Number 3 for United States Patent #5216440.

A gradation modulating apparatus is provided in a line thermal printer having a plurality of resistive elements arranged linearly widthwise of a medium sheet for printing gradated dots line-sequentially according to gradation image data. A memory is provided for storing individual weight data representative of energy generation rates of respective resistive elements, in corresponding addresses. An address generator is responsive to serial input of the gradation image data for generating an addressing signal effective to read out the stored individual weight data. A modulator is receptive of the inputted gradation data and the read weight data in synchronization with each other for producing modulated gradation image data according to the weight data. A latching circuit is connected for latching the modulated gradation image data line-sequentially. A driver is connected for applying driving signals regulated according to the latched modulated gradation image data to the resistive elements to enable the same to print dots having substantially the same print density for a given gradation level defined by the input gradation data.

  Recently Added Patents
Systems and methods for archiving and retrieving navigation points in a voice command platform
Systems, methods, and media for firewall control via remote system information
Coordinated garbage collection for raid array of solid state disks
Light emitting device and light emitting device package
Method and apparatus for secure transfer and playback of multimedia content
Chromene compound
Method and apparatus for a battery docking connector having reserve power for hot battery swap
  Randomly Featured Patents
Method of implanting living cells by laser poration at selected sites
Method and apparatus for handlng and dry quenching coke
Silicone resin composition, curable resin composition, and curable resin
Multi-layer composites
Lubricating oil compositions containing hydroxy polyether polyamines
Preparation of evaporated milk
Device for assisting in putting on elastic hosiery
Motion estimation for noisy frames based on block matching of filtered blocks
Hand-held electronic device
Process for the production of pyrocatechol and hydroquinone