Adhesive use in Retainer ring replacement bonding

The camera module is one of the most complicated parts of a smartphone, the lenses and frames can only be linked together by adhesive.

DELO adhesives are not only outstanding in variety, but also bond to many different materials, for high tensile strength and resistance to harsh environments.

Due to space is limited and requires not to allow dirty glue on the smartphone camera lens while ensuring the lens allows the sensor to absorb maximum light. Thus, the black adhesive will improve significantly its effectiveness. Besides, these components are very sensitive to heat, therefore require adhesive can be cured at low temperatures. The special adhesive products of adhesives compatible with Retainer ring replacement bonding include: DELO DUALBOND RE3440 DELO DUALBOND LT 3411 DELO KATIOBOND OB6… Some special adhesive compatible for lenses – barrel to holder bonding: DELO DUALBOND LT360 adhesive is beige, dual bonding DELO DUALBOND VE114549 adhesive is black, dual bonding DELO DUALBOND VE515435 adhesive is black, dual bonding

The adhesive characteristics requirements must be achieved:

• Replacing a threaded design to generate:
  • Smaller components dimensions;
  • Increase space for lens optics;
  • Higher optics performance;
  • Waste reduction/higher yield.
• Fast light prefixation: less than 1 s;
• Oven curing at moderate temperatures to protect lenses;
• Increased flexibility for stress relief;

Can be designed by various methods, for example:

Threaded (pre-design)	Simple lens	Lens with ring	Steps in housing	Inclined housing

The outstanding features of DELO adhesive:

• Low temperature curing <60^oC;
• Adhesive can be only cured by UV / visible light;
• High performance due to fast curing;
• Reduce maximum cost thank to optimized adhesive dispensing;
• Waste out vapor very low, non-effective to optical components;
• Fixed adhesive by UV / visible light within 1 second;
• The adhesive is black, help to obtain light better;
• Good bonding for many materials as PC, ZEONEX, COC, and CO;
• Compliant with RoHS directive 2015/863/EU;
• Solvent-free and non-halogen criteria of IEC 61249-2-21.

 The process of the bonding in lens camera:

Needle: G27	Alignment barrel/holder	Light curing	Heat curing	Focus measurement as follows customer process.
Gap: 5~55 um	Option 1:  1 shaft orientation	4 x LED lamp	30 min
Pressure: 4.2 bar	Option 2: 5 shaft orientation	Irradiation within 4s	80oC (begin temperature stable)
Volume: 0.8 ~2.0 mg		Intensity: 400 mW/cm2
Dispensing: - Option 1: Only 4 drops - Option 2: Ring-shaped dispensing			Humidity curing:
			24 hour
			Room temperature
			(Real curing time may be optimized by the customer)

For more information about DELO adhesive products, please contact us!

HUST Vietnam is proud to be the exclusive distributor of adhesive products, dispensing and curing systems, and technology transfer from DELO in Vietnam.