Coating Needle Adhesive Separation for Image Sensor Bonding
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Solution Overview
Problem
Existing coating methods for image sensors result in significant variations in adhesive application, leading to low-quality products due to excessive adhesive application, which causes adhesive dripping and creeping, affecting the bonding reliability between the semiconductor chip and the protective member.
Innovation Solution
A coating method and apparatus that involves a discharge step, a separating step to ensure the adhesive only adheres to the tip of the coating needle, and a controlled adhering step to minimize adhesive transfer to the nozzle and lateral surfaces, using a control unit to manage the speed and position of the coating needle to reduce variations in the coating amount.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If adhesive is applied in a large amount to ensure firm adhesion and reach four corners, then adhesion reliability is improved, but adhesive dripping and creeping occur causing low quality products
Solution Approach 1:
The adhesive transfer process is segmented into distinct phases: initial contact where adhesive transfers only to the tip, intermediate separation where adhesive on lateral surfaces returns to the nozzle, and final adhesion where controlled adhesive amount bonds the protective member. This segmentation prevents uncontrolled spreading and dripping while ensuring sufficient adhesive reaches the corners for reliable bonding.
Solution Approach 2:
The coating needle is preliminarily positioned and moved at constant speed to transfer adhesive to the tip before actual adhesion occurs. This preliminary adhesive transfer ensures the adhesive is properly positioned and controlled before the protective member makes contact, preventing excessive spreading and dripping that would compromise product quality.
2Ease of manufacture
If coating needle is moved at constant speed to transfer adhesive, then coating process is simplified, but variations in coating amount increase
Solution Approach 1:
The coating needle undergoes periodic motion with distinct phases: moving down at constant speed for adhesive transfer, pausing for separation, and then proceeding with adhesion. This periodic action pattern creates controlled intervals for adhesive transfer and separation, reducing variations in coating amount while maintaining process simplicity through automated cyclic operation.
3Ease of operation
If adhesive is spread in concentric circle shape, then adhesive naturally reaches corners, but excessive adhesive spreads causing dripping and creeping
Solution Approach 1:
The patent applies preliminary anti-action by designing the coating needle to separate adhesive from its lateral surfaces during the coating process. This preliminary separation prevents adhesive from spreading uncontrollably in concentric circles, thereby counteracting the harmful effects of dripping and creeping before they can occur, while still allowing sufficient adhesive to reach the corners for proper bonding.
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 approach significantly reduces adhesive variations, ensuring accurate filling of the corners and improved bonding reliability, minimizing the impact on subsequent steps and reducing the occurrence of adhesive dripping and creeping.
Implementation Method 1
a discharge step in which a coating needle adhering an adhesive comes out from a nozzle; a separating step in which the adhesive is separated onto the tip of the coating needle and the nozzle; and a adhering step that the adhesive adheres to a first member
Data Source
AI summary
The present disclosure provides a coating method for suppressing variations in a coating amount, a coating apparatus and a method for manufacturing a component. A coating method is employed, which includes: discharging a coating needle adhering to an adhesive from a nozzle; separating the adhesive into the tip of the coating needle and the nozzle; and adhering the adhesive to a first member. A coating apparatus is employed, which includes: a nozzle which holds the adhesive; a coating needle which is discharged from the nozzle in a state where the adhesive is adhered to the tip; and a control unit which controls moving speed of the coating needle to separate the adhesive into the tip of the coating needle and the nozzle.