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
Food safety printer
Apparatus and method for an iterative cryptographic block
System and method for discontinuous reception control start time
Method and device for generating low-jitter clock
Peptides useful in the treatment and/or care of skin, mucous membranes, scalp and/or hair and their use in cosmetic or pharmaceutical compositions
Method for transmitting an electronic short message to multiple receivers
Method and apparatus for the prevention of a service degradation attack
  Randomly Featured Patents
Alkylation of benzthiazole-azo-phenylamine dyestuffs
Disc device
Semiconductor device having two-layer contact
Pneumatic tire
Golf club caddy
Trundle loop and method of detachably connecting same to a hoop
Apparatus and method for delivery of combustion air in multiple zones
Apparatus for transferring objects from a first to a second conveyor
Safety device for clamping screws on pressurized fluid receptacles