DELO adhesive specialized for VCM in the camera module

Today, millions of smartphone cameras are equipped with autofocus (AF) and OIS optical stabilization technology based on the VCM platform. DELO DUALBOND adhesive allows extremely fast fixing of parts with the ability to cure in obscured areas. This is a big advantage because the VCM module has many very small details and has a difficult surface to bond like LCP or PC.

Structure of VCM: includes a permanent magnet (1) integrated into a sliding shell (2) and a portable lens mobile holder containing coil (3). When the voltage is changed, lead to the magnetic field changes, the electromagnetic force generated causes the lens to move parallel to the axis of the sliding shell (4).

VCM parts are made from a variety of materials, but mainly plastic and metal.

 Required and tested adhesive properties apply for VCM include:

• UV light fixation in a very short period of time
• No heat curing or even low-temperature curing below +80 °C
• High adhesion to LCP and different metals
• Drop test & tumble test passed
• Very low outgassing, no condensation on the lens due to low outgassing
• Cleaning of the components with water after bonding
• High temperature stability: more than 500 h +85 °C/85 % r.h.

Product lines used for this case:

• DELO DUALBOND AD (light and heat curing)
• DELO DUALBOND AD49… (light and humidity curing)
• DELO DUALBOND và DELO MONOPOX LT (light and heat curing)
• DELO – ML DB (DELO-ML DB180 is suitable) (light and anaerobic curing)

Adhesive and process advantages from which the user can benefit and meet all of the above requirements:

• UV / visible light fixation of components within seconds;
• Low-temperature curing from +60^oC;
• DELO DUALBOND LT, or <+80^oC;
• UV/light with optional second humidity curing mechanism in shadowed areas;
• Very low outgassing cause no damage to the lens, filter, or sensors;
• Excellent bond strength on substrates used such as LCP and PC and on metals;
• High performance due to fast curing;
• Resistance to drop and tumble test
• Solvent-free components;
• Halogen-free according to IEC 61249-2-21;

 Process of bond components in VCM by DELO adhesive:

Technical parameters for each process:

1. Bond magnet to yoke:

Placement of magnet on steel yoke	Dispensing	Light fixation	Anaerobic curing
	5 mg per component	LED lamps
		Irrradiation time: 5 – 10 s
		200 mW/cm2

2. Bond coil to the lens holder

Placement of copper coil on LCP holder	Dispensing: 5 mg per component	Injection of nitrogen to ensure the dry surface	UV Light fixation	Humidity curing
	Time-pressure dispensing adjustment		LED Lamps
	Needle: G27		Wavelength:  365 nm
			Irradiation time: 5 – 10 s
			Intensity: 250 mW/cm2
			Up to down irradiation

3. Spring to the upper base plate

Placement of steel spring on the upper base plate	Volume: 10 mg per component	Injection of nitrogen to ensure the dry surface	Light fixation	Humidity curing  (>65%)

4. Yoke to the base plate

Placement of nickel Yoke on LCP base plate	Volume:	Injection of nitrogen to ensure the dry surface	Light fixation	Heat curing or Humidity curing
	5 mg per component	Injection time: 2 s	Irradiation time: 3 – 5 s
			Intensity: 200 mW/cm2

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

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