摘要:
An image processing apparatus (10) comprises an imaging drum (300) for holding print media (32) and donor material (36) in registration on the imaging drum (300). A print head (500), driven by a lead screw (250) and stepper motor, moves along a line parallel to a longitudinal axis (X) of the imaging drum (300) as the imaging drum (300) rotates. The print head (500) is brought repeatably to a mechanical registration position using sensors. For coarse positioning, the print head (500) is moved to a first linear sensor position, with the drive motor operated in full-step mode. For fine positioning, the drive motor is then operated in microstepping mode, during which a second sensor detects rotational orientation by detecting a rotational indicator mounted on the lead screw (250). The rotational indicator permits straightforward adjustment for fine-tuning, being adjustable to any one of a number of fixed positions relative to lead screw rotation.
摘要:
The present invention is for a method for adjusting a focus of a multichannel printhead (500) for an imaging processing apparatus (10) performing the steps of establishing a home focus position and moving the printhead (500) in a first direction a predetermined number of coarse density. The printhead (500) is moved to the coarse focus position and then moved in a second direction a predetermined number of fine steps. A series of second test patches is printed on the media (32) at each of the fine steps. A fine focus position is determined by checking a fine density of each of the second test patches and selecting the fine focus position corresponding to the second test patch having a highest fine density.
摘要:
A printer with media supply spool adapted to sense type of media, and method of assembling same. A supply spool to be loaded into the printer is adapted to allow the printer to sense type of a media ribbon thereon. The supply spool comprises a shaft having a supply of media ribbon wound thereabout. A transceiver unit is disposed proximate the shaft. The transceiver is capable of transmitting a first electromagnetic field and sensing a second electromagnetic field. A transponder including a semi-conductor chip is integrally connected to the shaft and has encoded data previously stored therein indicative of the type of media ribbon. The chip is capable of receiving the first electromagnetic field to power the chip and then generating the second electromagnetic field as the chip is powered. The second electromagnetic field is characteristic of the data previously stored in the chip. The transceiver unit senses the second electromagnetic field, which second electromagnetic field has the data subsumed in the chip. The printer then operates in accordance with the data sensed by the transceiver to produce quality prints consistent with the type of donor being used.
摘要:
A laser diode controller (30) having a constant current source (60) which supplies current to a laser diode (90) is disclosed. A current shunt switch (40) directs current to either the laser diode (90) or to a bypass circuit (42). A thermal compensator (70) alters a current level of the constant current source (60) as a function of on-time of the laser diode (90) to compensate for changes in optical power conversion efficiency due to temperature changes in the laser diode. A thermo electric cooler controller (80) maintains a constant temperature of a substrate on which the laser diode is mounted. In one embodiment, an array of sample and hold amplifiers (50) eliminates a need for multiple DACs.