Optical Scanning Cleaning Holder for Accurate End-Position Detection
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Solution Overview
Problem
Conventional optical scanning devices face challenges in maintaining detection accuracy and smooth movement of cleaning holders due to light leakage and frictional resistance during the cleaning process, which can lead to operational inefficiencies and potential damage to components.
Innovation Solution
The optical scanning device incorporates a detection portion with a light emitter and receiver, a cleaning holder with light blocking portions, and a control portion to manage the movement of cleaning holders, along with a light leakage prevention mechanism using a light blocking rib or reflection suppression methods to enhance detection accuracy and prevent component damage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the cleaning holder moves along the transmissive member during cleaning, then the transmissive member is cleaned, but light leakage occurs between the cleaning holder and housing causing detection errors
Solution Approach 1:
A light blocking portion is introduced as an intermediary element between the cleaning holder and the housing. This light blocking portion prevents light from leaking past the cleaning holder to the detection portion, thereby eliminating detection errors while allowing the cleaning function to operate effectively.
Solution Approach 2:
The harmful light leakage path is extracted and blocked by adding the light blocking portion. This separates the cleaning function from the detection function, allowing each to operate independently without interference from the other.
2Reliability
If the cleaning holder moves along the guide rail, then cleaning is performed, but frictional resistance occurs between the cleaning holder and guide rail
Solution Approach 1:
The cleaning holder is designed with a flexible structure that includes a light blocking portion made of material with appropriate friction characteristics. This flexible design allows smooth movement along the guide rail while maintaining effective light blocking, reducing frictional resistance during operation.
3Measurement precision
If the light blocking portion is added to prevent light leakage, then detection accuracy improves, but device complexity increases
Solution Approach 1:
The light blocking portion is merged with the cleaning holder structure, combining two functions (cleaning and light blocking) into a single integrated component. This merging approach prevents light leakage and improves detection accuracy without significantly increasing overall device complexity.
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
This configuration ensures precise detection of cleaning holder positions, reduces frictional resistance, and prevents damage to components, thereby improving the operational efficiency and reliability of the scanning device.
Implementation Method 1
a light emitter that emits light in a juxtaposition direction of the transmissive member and a light receiver that receives light emitted from the light emitter
Implementation Method 2
The cleaning holder includes a light blocking portion that is located, when the cleaning holder reaches the one end part of the movement path thereof, between the light emitter and the light receiver so as to block light emitted from the light emitter
Data Source
AI summary
An optical scanning device includes a housing, a transmissive member, a linear member, a drive portion, a guide rail, a cleaning holder, a cleaning member, a detection portion, and a control portion. The detection portion includes a light emitter that emits light in a juxtaposition direction of the transmissive member and a light receiver that receives the light emitted from the light emitter. The cleaning holder includes a light blocking portion that is located, when the cleaning holder reaches one end part of a movement path thereof, between the light emitter and the light receiver so as to block the light emitted from the light emitter, with a gap formed between the light blocking portion and the housing. The housing includes a light leakage prevention portion formed between the light emitter and the light receiver.