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
Carrier frequency offset (CFO) estimator with low complexity and high accuracy for orthogonal-frequency-division-multiplexing (CO-OFDM) systems
Toy vehicle housing
Image forming apparatus, method and medium for detecting blank pages
Refill container
Dipole based decoy system
Chair with shining stripe
Semiconductor device with integrated antenna and manufacturing method therefor
  Randomly Featured Patents
Process for decomposing carbon-containing compounds
Optimization of polling protocols in sensor networks
Power supply
Toner binder resin and static charge developing toner using the resin
Electrochemical process
Electrically controllable valve
System for detecting ranges in an automatic transmission for vehicles
Automatic on-line chemistry monitoring system having improved calibration unit
Hand held drywall drill
Doll with incrementally movable arm