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
Woven mesh substrate with semiconductor elements, and method and device for manufacturing the same
Container pack
Lookup front end packet input processor
Waterproof wound protector
Refuelable battery-powered electric vehicle
Modification of an object replica
Radiation imaging device
  Randomly Featured Patents
Selective etching method, optoelectronic device and its fabricating method
Device for collecting dust using highly charged hyperfine liquid droplets
Method for producing a housing for a throttle valve connection piece
Flower shape soft glow night light
Method for determining luminance threshold value of video region and related apparatus
Machine for dispensing uniform lengths of thick plastic film
Treatment of GLC1A glaucoma with non-steroidal glucocorticoid antagonists
Liquid crystal display having OCB mode dummy liquid crystal cells and driving method thereof
Socket for connecting ball-grid-array integrated circuit device to test circuit
Trenches to reduce charging effects and to control out-of-plane sensitivities in tuning fork gyroscopes and other sensors