Contact Glass Sheet Adhesive Segmentation for Scanner Maintenance
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Solution Overview
Problem
The existing image reading apparatuses face challenges in easy recycling or replacement of contact glass sheets, risk of breakage during removal, and dust intrusion due to insufficient adhesion and direct contact with the frame body, leading to increased assembly time and contamination.
Innovation Solution
The apparatus features an upward-open lower frame and an upper frame with protruding glass supports and a strip-shaped adhesive member on the upper frame, allowing for easy attachment and detachment of the contact glass sheet, reducing dust intrusion by minimizing gaps and using interrupted adhesive parts for secure positioning.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the contact glass sheet is directly attached to the frame body without adhesive tape, then the structure is simple, but clearance is created due to insufficient flatness allowing dust intrusion
Solution Approach 1:
The patent introduces adhesive tape as an intermediary substance between the contact glass sheet and frame body. The adhesive tape fills gaps and creates a sealed interface, preventing dust intrusion while maintaining attachment. This resolves the contradiction by adding a simple mediating element that eliminates clearance without complex structural modifications.
2Manufacturing precision
If the scale plates are adhered to the contact glass sheet with double-sided adhesive tape, then positioning is improved, but removal becomes difficult and may break the glass sheet
Solution Approach 1:
The patent segments the adhesive attachment into two distinct parts: adhesive tape for securing the contact glass sheet to the frame body (permanent attachment), and no adhesive on the scale plate rear faces (removable attachment). This segmentation allows the contact glass sheet to be firmly positioned while enabling easy removal of scale plates without breaking the glass sheet.
3Adaptability or versatility
If multiple components (scale plates, contact glass sheet, cover) are assembled together, then functional completeness is improved, but assembly time increases
Solution Approach 1:
The patent extracts the scale plates from the permanent attachment structure by not applying adhesive to their rear faces. This allows scale plates to be easily added or removed independently, reducing assembly time for maintenance operations while maintaining full functionality when assembled. The contact glass sheet remains firmly attached through adhesive tape to the frame body.
Solution Approach 2:
The patent creates a dynamic assembly structure where components have different attachment characteristics: the contact glass sheet is permanently fixed with adhesive tape, while scale plates are temporarily attached and can be easily removed. This dynamic design allows the system to adapt between complete assembly for operation and partial disassembly for maintenance, optimizing both functional completeness and assembly efficiency.
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 enables easy recycling of the contact glass sheet without damage, reduces dust intrusion, and simplifies assembly by minimizing gaps between the contact glass sheet and the frame, ensuring stable operation and efficient recycling.
Implementation Method 1
a longitudinal scale plate 101a and a vertical scale plate 101b of scale plates 101 are adhered to a contact glass sheet 102 along two sides thereof respectively by means of double-sided adhesive tape 104
Implementation Method 2
the contact glass sheet pasted with the scale plates are placed on a frame body 103 while inserting protrusions 111 of the scale plates 101 into holes 103a provided on the frame body 103
Data Source
AI summary
In order to provide an image reading apparatus of which a contact glass sheet can be replaced and recycled with ease without damaging the contact glass sheet when removing the same, and further intrusion of particles of dust into the apparatus when operating the apparatus can be prevented, an image reading apparatus having an image reading unit mounted to be able to be reciprocated in a frame body of the apparatus and a contact glass sheet is composed such that; the frame body comprises an upward-open lower frame in which the image reading unit is accommodated to be able to be reciprocated and an upper frame having an opening on the upper face thereof to be covered with the contact glass sheet, the upper and lower frames are assembled detachably by means of fitting portions provided to both frames, the contact glass sheet is attached to said upper frame by means of a strip-shaped adhesive member glued onto the undersurface of the upper frame along the brim part of the opening to be covered with the contact glass sheet, the strip-shaped adhesive member is glued onto the undersurface of the upper frame so that the strip is not continuous but partially interrupted to provide interrupted parts, and the glass sheet supports protruding from the lower frame are positioned to support the contact glass sheet at the position corresponding to the interrupted parts of the strip-shaped adhesive member.