Image Reading Device Deceleration Start Position Control
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Solution Overview
Problem
Conventional image reading devices become bulky when attempting high-speed image reading of large-sized originals due to elongated acceleration and deceleration regions, which complicates reading control and can degrade image quality.
Innovation Solution
An image reading device with a movement control unit that accelerates, maintains a constant velocity, and decelerates within specific regions, allowing the deceleration to start between the constant-velocity and deceleration regions, and sets the deceleration start position based on the image region length and velocity, optimizing the reading process for compactness and quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If high-speed reading mode is implemented with extended acceleration and deceleration regions, then image reading speed is improved, but device size increases
Solution Approach 1:
The patent applies dynamics by making the deceleration start position adjustable rather than fixed. The control unit dynamically determines the deceleration start position based on the image region length and reading speed mode, allowing the system to adapt the acceleration and deceleration regions to actual operational requirements. This enables high-speed reading without requiring permanently extended device structures.
Solution Approach 2:
The patent changes the parameter of deceleration start position based on reading speed mode and image region length. In high-speed reading mode, the deceleration start position is set later (closer to the end of the image region), while in normal mode it is set earlier. This parameter adjustment allows the same physical device to accommodate different speed requirements without requiring separate physical configurations.
2Productivity
If image reading occurs during acceleration and deceleration, then reading continuity is improved, but image quality deteriorates
Solution Approach 1:
The patent segments the reading process into distinct phases: acceleration phase (where reading may occur with quality degradation), constant velocity phase (where high-quality reading occurs), and deceleration phase (where reading may occur with quality degradation). By segmenting the motion profile this way, the system can maintain high-speed productivity while preserving image quality in the critical constant velocity reading region.
Solution Approach 2:
The patent applies partial action by reading images during acceleration and deceleration phases only when necessary, rather than avoiding these phases entirely. The control unit determines based on the image region length and reading mode whether to read during these transitional phases, allowing partial reading activity that maintains productivity without unnecessarily compromising quality.
3Volume of moving object
If deceleration start position is delayed, then device compactness is improved, but reading control complexity increases
Solution Approach 1:
The control unit performs self-service by automatically calculating and determining the optimal deceleration start position based on pre-stored parameters (image region length, reading speed mode, acceleration and deceleration rates). The control unit compares the image region length against threshold values and autonomously selects the appropriate deceleration start position without external intervention, simplifying the overall control architecture despite the increased computational requirements.
Data Source
AI summary
In S1, an image reading device obtains an image region length Ld of an original placed on an original mounting portion, a set moving velocity Vm of an image reading unit, a required deceleration distance Ls, a reference velocity Vr, and an absolute length Z. In S5, the image reading device sets a flag to 0 if Vm<=Vr (S2: NO) or Z>=(Ld+Ls) (S3: YES) and reads the entire image region length while the image reading unit is moving at the set moving velocity Vm. The image reading device sets the flag to 1 if Vm>Vr (S2: YES) and Z<(Ld+Ls) (S3: NO), reads the image region while the image reading unit is moving at the set moving velocity Vm up to the deceleration start position while the distance moved by the image reading unit is less than or equal to (L1+Z-LS) (S17: NO), then if the distance is greater than (L1+Z-Ls) (S17: YES), the image reading unit performs deceleration reading and reads up to a position immediately downstream of the image region.