Inkjet Recording Apparatus Analog Digital Signal Segmentation
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Solution Overview
Problem
Ink jet printers face noise interference issues due to long cables connecting external ink supplying devices to the printer's controller, affecting control accuracy and reliability.
Innovation Solution
The implementation of a recording apparatus with electric wiring that includes relay substrates and cables, where analog signals are converted to digital signals near the ink accommodating members and transmitted through shorter digital signal cables to the controller, reducing noise interference and allowing for easier maintenance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If the ink accommodating portion is provided outside the apparatus main body and connected by a cable, then the ink capacity can be increased, but the cable length increases and noise interference worsens
Solution Approach 1:
The cable is divided into two segments: a first cable connecting the ink accommodating portion to the connection portion, and a second cable connecting the connection portion to the controller. This segmentation allows the analog signal cable (first cable) to be isolated from the digital signal cable (second cable), reducing noise interference while maintaining the external ink supply configuration.
Solution Approach 2:
A connection portion is introduced as an intermediary component between the ink accommodating portion and the controller. This connection portion serves as an interface that separates the analog signal transmission (from ink sensors) from the digital signal transmission (to the controller), thereby reducing noise interference while enabling the external ink supply system to function properly.
2Adaptability or versatility
If the cable length is increased to connect external ink supplying device, then the ink accommodating portion can be placed outside, but control accuracy deteriorates due to noise
Solution Approach 1:
The electrical connection is segmented into two separate cable systems: one for analog signals from ink sensors to the connection portion, and another for digital signals from the connection portion to the controller. This segmentation prevents noise from affecting control accuracy while maintaining the flexible external ink supply configuration.
Solution Approach 2:
The connection portion acts as an intermediary that receives analog signals from the external ink accommodating portion and converts/transmits them through a separate digital cable to the controller. This intermediary function isolates the control system from noise while preserving adaptability to external ink supplies.
3Volume of stationary object
If the cable is made longer to reach external ink accommodating member, then the ink storage capacity can be increased, but the noise influence on control signal increases
Solution Approach 1:
The cable system is segmented into two independent pathways: an analog signal cable for ink level detection and a digital signal cable for control communication. This segmentation ensures that the longer cable required for external ink accommodation does not compromise control reliability, as the digital control signals are transmitted through a separate, noise-resistant pathway.
Solution Approach 2:
The connection portion serves as an intermediary that decouples the analog sensing function from the digital control function. By receiving analog signals from the external ink accommodating member and transmitting processed information through a separate digital cable to the controller, it maintains control reliability while enabling larger ink storage capacity.
Data Source
AI summary
In a configuration in which an ink accommodating portion is provided on the outside of an apparatus main body, an appropriate control for suppressing influence of noise can be performed.A recording apparatus includes a recording head that is capable of discharging liquid onto a medium, a controller that controls the recording head, a recording unit that includes the recording head and the controller, a tank unit that includes a liquid accommodating member accommodating the liquid and an electronic component holding information of the liquid accommodating member, a tube that guides the liquid from the liquid accommodating member to the inside of the recording unit, and an electric wiring that electrically connects the controller and the electronic component, in which the electric wiring includes a connection portion which connects cables, a cable on the electronic component side constituting a wiring of the electronic component side with respect to the connection portion, at least a part of which is wired in the tank unit, and a cable on the controller side constituting a wiring of the controller side with respect to the connection portion, at least a part of which is wired in the recording unit, a signal transmitted by the cable on the electronic component side includes an analog signal, and a signal transmitted by the cable on the controller side does not include an analog signal.