Handheld Printer Sensor Positioning for Freehand Scanning Accuracy
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Solution Overview
Problem
Existing portable printers lack precise control and accuracy in freehand scanning printing, as they struggle to calculate and maintain the correct positions of nozzles relative to the print medium, leading to inconsistent and inaccurate image formation.
Innovation Solution
A hand-held printer system equipped with sensors, a control module, and a recording head that calculates the positions of sensors and nozzles on the print medium, determining the timing for ink discharge based on image data and sensor positions, allowing for precise control and accurate printing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Weight of moving object
If freehand scanning printing is performed without paper conveyance system, then portability and compactness are improved, but positioning accuracy and printing precision deteriorate
Solution Approach 1:
The patent employs sensors to continuously detect the actual position of the printer relative to the print medium during freehand scanning, and feeds this position information back to the control unit. The control unit then adjusts the discharge timing of liquid droplets based on the detected position deviations, enabling real-time correction and maintaining printing accuracy despite manual movement.
Solution Approach 2:
The patent replaces the traditional mechanical paper conveyance system with a sensor-based position detection and calculation system. Instead of using mechanical means to maintain fixed positioning between printer and paper, the system uses optical sensors, image processing, and computational algorithms to calculate positions and control printing accordingly.
2Measurement precision
If multiple sensors are used to calculate total moving distance, then positioning precision is improved, but device complexity increases
Solution Approach 1:
The patent divides the position detection function into multiple independent sensors positioned at different locations on the printer. Each sensor independently measures position or movement information, and the control unit integrates these segmented measurements to calculate the total moving distance and current position, thereby improving measurement precision through redundancy and distribution.
Data Source
AI summary
A printer is provided which includes: a recording head having multiple nozzles; two or more sensors that read a print medium into an image thereof and calculate a total moving distance based on the image; an instruction unit that instructs a timing for discharging liquid droplets from one or more of the nozzles; a sensor position calculator that calculates a position of each of the sensors; a nozzle position calculator that calculates a position of each of the nozzles; an acquisition unit that acquires image data of a specified area within an image to be printed; a determination unit that determines whether or not to discharge the liquid droplets from each of the nozzles; and a transmitter that transmits data of one or more of image elements and information on one or more of the nozzles determined to discharge the liquid droplets to a controller.