How do you minimize camera module size?

Introduction
In many modern devices – medical endoscope camera module, drones, wearables, and smartphones – space is a luxury. A smaller camera allows thinner products, less invasive medical tools, and more room for other parts. But shrinking a camera without losing image quality is not easy. This article shares practical ways to minimize camera module size, whether you are designing a custom OEM camera module or picking a standard USB Camera Module or HD camera module.

Why Size Matters

• Medical endoscopes – a smaller tip reduces patient discomfort and reaches narrower passages.

• Consumer electronics – smartphones, smart glasses, drones need ultra‑compact cameras.

• Industrial borescopes – tiny cameras fit into tighter inspection holes.

A large camera forces design compromises. By making it smaller, you gain flexibility.

1. Choose a Small‑Form‑Factor Sensor
The image sensor is the biggest part. To shrink it:

• Pick a smaller sensor die (e.g., 1/9″ instead of 1/3″). This reduces pixel size and low‑light performance – a trade‑off.

• Use wafer‑level packaging (WLP) – the sensor is packaged without a bulky ceramic or plastic case.

• For an endoscope camera module, the OmniVision OV6948 integrates lens and sensor into a single 0.65 mm × 0.65 mm chip.

2. Use Chip‑on‑Board (COB) Assembly
Traditional sensors come in a protective package (PLCC, CSP). COB mounts the bare die directly on the PCB, removing the package. Benefits:

• Lower height – no package thickness.

• Smaller footprint – no extra leads or margins.

• Better heat transfer – die directly on board.

COB is common in high‑volume OEM camera module production, especially for HD camera module designs.

3. Use a Board Lens Instead of M12
Many USB Camera Module designs use an M12 lens (12 mm diameter thread). For compactness:

• Choose a board lens (S‑mount) – glued directly onto the sensor or a tiny holder. No thread, no locking ring.

• Board lenses can be as small as 3 mm in diameter. They are fixed‑focus, which is fine for many uses.

For an endoscope camera module, board lenses are the only practical choice – the tip must be under 5 mm.

4. Use Flexible PCBs
The board that holds the sensor and components can be reduced by:

• Using a flexible printed circuit (FPC) instead of a rigid board. The flex can be folded, making the camera head very thin.

• Placing passive components on the flex or integrating them into the sensor’s own substrate.

• For a USB Camera Module, put the bridge chip and USB connector on a tiny rigid‑flex board that folds behind the sensor.

5. Simplify the Interface
Interface electronics add bulk. To shrink:

• Use MIPI CSI‑2 directly – no bridge chip. The sensor outputs video straight to the processor. Saves a whole IC.

• If USB is needed, pick a USB bridge chip in a tiny WLCSP package (e.g., 3 mm × 3 mm) and combine it with the sensor on one board.

• For a HD camera module, a raw MIPI output is much more compact than USB.

6. Reduce the Number of Lens Elements
High‑quality lenses use multiple elements (5‑6 glass pieces). Each adds length and diameter. To shrink:

• Use aspherical plastic lenses – one aspherical can replace two spherical ones.

• Accept slightly lower image quality (e.g., softer corners) if your application doesn’t need perfect edges.

• For an endoscope camera module, a single plastic aspherical lens is common – works well in a 2 mm diameter.

7. Integrate LEDs on the Same Substrate
Many camera modules have LEDs for lighting. Instead of a separate LED board:

• Place LEDs directly on the same PCB or flex as the sensor.

• Use bare LED dies (chip‑on‑board for LEDs) instead of packaged LEDs.

• For a USB Camera Module used as a borescope, this saves about 1–2 mm in diameter.

8. Customise the Shape (OEM Camera Module)
Off‑the‑shelf modules are square or round. An OEM camera module can be shaped to exactly fit your enclosure:

• Make the PCB non‑rectangular – L‑shaped, cut‑out, or a semi‑circle.

• Place the connector on a flex extension that routes away from the camera head.

• For a medical endoscope camera module, the whole tip is often a custom cylinder with lens, sensor, and LEDs potted inside a thin metal tube.

9. Remove Unnecessary Features
Every extra feature adds size. Ask yourself:

• Do you need autofocus? Fixed focus saves the VCM actuator (1–2 mm).

• Do you need a removable IR‑cut filter? For visible‑light only, a fixed filter is smaller.

• Do you need a separate ISP? Integrate ISP into the sensor or host processor.

For a HD camera module used only in bright conditions, removing the IR‑cut filter and using a simple lens can cut size by 20%.

10. Work with an Experienced OEM Manufacturer
Designing a tiny camera needs mechanical, optical, and electrical know‑how. An experienced OEM camera module supplier like Sincere can:

• Optimise the layout for minimal footprint.

• Source the smallest components (sensors, passives, connectors).

• Use advanced assembly (COB, wafer‑level optics).

Summary
To minimize camera module size, focus on sensor packaging (COB, wafer‑level), lens type (board lens instead of M12), interface (MIPI over USB), and custom shaping (flex PCBs, irregular boards). For an endoscope camera module, every millimetre counts – COB and board lenses are essential. A USB Camera Module can be made smaller with a tiny bridge chip and on‑board LEDs. A HD camera module benefits from MIPI and aspherical plastic lenses. By balancing these techniques, you can achieve the smallest possible camera for your project.

Contact Sincere to discuss your OEM camera module miniaturisation project.