Views: 0 Author: Site Editor Publish Time: 2026-05-20 Origin: Site
Introduction
A camera module may look simple – a lens, a sensor, a small board. But creating a reliable, high‑performance module requires several specialised manufacturing processes. Whether you need an endoscope camera module for medical use, a small camera module for a drone, or an HD endoscope camera module for industrial inspection, the production steps directly affect image quality, durability, and cost. This article explains the key manufacturing processes behind modern camera modules.
1. SMT – Placing Components
First, the PCB is assembled. SMT (Surface Mount Technology) machines place tiny resistors, capacitors, and drivers onto the board. Then the board goes through a reflow oven to solder everything in place. For a sensor camera module, the sensor may be added in this step or later.
2. Sensor Attachment (Die Bonding / COB)
The image sensor is the heart of any CMOS Camera Module. Two common methods:
CSP (Chip Scale Package) – The sensor comes pre‑packaged and is soldered like other components.
COB (Chip on Board) – The bare silicon die is glued directly onto the PCB and wire‑bonded. COB eliminates the package, making a small camera module thinner and better at cooling. COB is widely used for endoscope camera module where every millimetre matters.
3. Wire Bonding
If COB is used, the sensor die must be connected electrically to the PCB. A wire bonding machine attaches ultra‑fine gold or aluminium wires from the sensor’s pads to the PCB. This must be done in a cleanroom (Class 10/100) to avoid contamination.
4. Lens Assembly and Active Alignment
The lens must be perfectly positioned over the sensor. High‑quality modules use active alignment: the lens is moved in six axes while the sensor captures a test chart. Software finds the position that maximises sharpness and centre alignment. Then the lens is fixed with UV glue. This step is critical for an HD endoscope camera module where edge‑to‑edge sharpness is needed.
5. Lens Holder and Barrel Assembly
For threaded lenses (M12), the lens screws into a barrel. For board lenses (S‑mount), the lens is glued into a holder. The holder is then attached to the sensor – either by active alignment or a mechanical stop.
6. Adding LEDs (Illumination)
Many camera modules include LEDs for lighting. The LED chips are mounted on the same PCB (or a separate ring) using SMT. For an endoscope camera module, LEDs are placed around the lens to provide even illumination.
7. Cable and Connector Assembly
For modules with a cable (e.g., USB endoscopes), the cable is soldered or pressed into the PCB. Strain relief – an overmoulded boot or adhesive – stops the cable from pulling out. The connector (USB, FPC, etc.) is attached at the other end.
8. Sealing and Waterproofing
If the module needs to be waterproof (IP67/IP68), the assembly is potted with epoxy or silicone. The lens window is sealed with an O‑ring or adhesive. For a small camera module used outdoors, sealing is essential.
9. Calibration and Testing
Every module must pass functional tests:
Optical tests – resolution, distortion, depth of field.
Colour calibration – white balance and colour matrix.
Electrical tests – power, signal quality.
Focus verification – for fixed focus, depth of field is checked.
Waterproof test – pressure decay or submersion.
10. Firmware Loading
Many CMOS Camera Module designs include an on‑board ISP (image signal processor) or USB bridge. Firmware is loaded during production to set auto‑exposure, white balance curves, and UVC descriptors.
Processes by Module Type
Module Type | Key Process |
|---|---|
Endoscope camera module | COB, tiny board lenses, cable overmoulding, IP sealing |
Small camera module | COB, direct lens bonding, flex output (no connector) |
Sensor camera module | COB or CSP, wire bonding |
CMOS Camera Module | SMT + lens gluing or M12 mount |
HD endoscope camera module | Active alignment, high‑precision lens assembly |
Manufacturing Environment – Cleanrooms
Camera modules are extremely sensitive to dust. A single particle on the sensor shows as a dark spot in every image. Therefore, COB, wire bonding, and lens attachment must be done in cleanrooms (Class 10 or Class 100). At Sincere, we manufacture all endoscope camera module and other products in such controlled environments.
Sincere’s Capabilities
We perform the full range of manufacturing processes:
SMT, COB, wire bonding, active alignment, potting, cable assembly, calibration, and testing.
We produce endoscope camera module, small camera module, sensor camera module, CMOS Camera Module, and HD endoscope camera module designs.
Summary
The manufacturing processes for camera modules include SMT, sensor attachment (CSP or COB), wire bonding, active alignment, lens assembly, LED integration, cabling, waterproof sealing, calibration, and firmware loading. For an endoscope camera module, COB and active alignment are critical for small size and sharp focus. A small camera module benefits from COB and direct lens bonding. All CMOS Camera Module designs rely on precise active alignment. Understanding these processes helps you choose a manufacturer with the right capabilities – ensuring your HD endoscope camera module or other product meets its performance and reliability goals.
Contact Sincere to discuss your camera module manufacturing needs.
