Image Scanner Pressure Plate Angle Control for Glare Reduction
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Solution Overview
Problem
Existing image reading apparatuses face challenges in distinguishing the presence or absence of an original due to the similarity in reflected light between the original and the pressure plate, leading to glare issues and inefficient size detection, especially when the pressure plate is closed, as the light source's angle settings are not adaptable to user height variations.
Innovation Solution
An image reading apparatus that includes a pressure plate with adjustable angles and an angle detector to switch between two modes: one for glare avoidance and another for speed priority, allowing the light source to be controlled based on the pressure plate's angle with respect to the reading unit, enabling accurate size determination in both main and sub-scanning directions without direct light exposure to the user.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If the pressure plate is opened at a predetermined angle to prevent light from reaching the user's eyes, then glare is avoided, but the detection time is extended and user convenience is reduced
Solution Approach 1:
The pressure plate angle is made dynamically adjustable based on detection mode. The control unit switches between a first angle (faster detection) and a second angle (glare prevention) depending on user selection, allowing the system to adapt its geometric configuration to different operational requirements rather than being fixed at one angle
Solution Approach 2:
The angle parameter of the pressure plate is changed based on detection mode selection. When speed priority is selected, the plate is positioned at a first angle that enables faster detection; when glare avoidance is selected, it is positioned at a second angle that prevents light from reaching the user's eyes, thus changing the geometric parameter to satisfy different operational priorities
2Measurement precision
If the pressure plate is closed to enable original size detection, then detection accuracy is improved, but light from the source directly reaches the user's eyes causing glare
Solution Approach 1:
The pressure plate angle is dynamically adjusted based on the detection mode. In speed priority mode, the plate is positioned at a first angle that allows accurate detection while minimizing glare. In glare avoidance mode, the plate is positioned at a second angle that prevents light from reaching the user's eyes, thus dynamically adapting the geometric configuration to balance detection accuracy and user comfort
Solution Approach 2:
The angle parameter of the pressure plate is changed according to detection mode selection. The control unit positions the plate at a first angle when speed is prioritized and at a second angle when glare avoidance is prioritized, thereby changing the geometric parameter to simultaneously achieve detection accuracy and prevent harmful light exposure
3Productivity
If the light source is turned on with the pressure plate in an open state to enable detection, then detection speed is improved, but light emitted from the source directly reaches the user's eyes
Solution Approach 1:
The pressure plate angle is made dynamically adjustable based on detection mode. When speed priority is selected, the plate is positioned at a first angle that enables faster detection by allowing the light source to be turned on. When glare avoidance is selected, the plate is positioned at a second angle that prevents light from reaching the user's eyes, thus dynamically adapting the configuration to different operational priorities
Solution Approach 2:
The angle parameter of the pressure plate is changed based on detection mode selection. The control unit positions the plate at a first angle for speed priority mode and at a second angle for glare avoidance mode, thereby changing the geometric parameter to balance detection speed and prevention of harmful light exposure
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution allows for effective size detection in both scanning directions while minimizing glare by adjusting the light source's operation based on the pressure plate's angle, ensuring accurate and efficient original size determination regardless of user height or detection mode priority.
Implementation Method 1
a light source configured to radiate light and to move in a first direction
Implementation Method 2
a reading element configured to receive reflected light from the original illuminated with the light radiated from the light source
Data Source
AI summary
An image reading apparatus including: an angle detector configured to detect a first state in which a pressure plate is at a first angle with respect to a transparent member and a second state in which the pressure plate is at a second angle smaller than the first angle; a size determiner configured to determine a size of the original in a main scanning direction based on a reading result of a reader; and a controller configured to switch a first size determination mode in which a light source is turned on when a waiting state in which an angle of the pressure plate is larger than the first angle is changed to the first state, and a second size determination mode in which the light source is tuned on when the first state is changed to the second state.