Liquid Lens Technology
Liquid lens technology is a rapidly growing new technology in the field of industrial lenses, offering many advantages over traditional lenses in various applications. It is their versatility and flexibility that have become the main driving forces behind their successful adoption.
But what exactly is liquid lens technology? How does it work? And what is its purpose?
Superior Autofocus with Liquid Lenses
For digital images, precise control of focus is essential to obtain high-quality images. The subject of the image must be very clear, while the rest of the background remains blurred. Autofocus functionality is at the core of capturing high-quality photos, and liquid lenses bring new capabilities to autofocus.
Liquid lenses can be used in various applications, such as:
- Digital photography
- Industrial data collection
- Barcode reading (1D and 2D)
- Biometric data collection
Essentially, liquid lenses can be used in any application where there is a significant variation in object distance and fast autofocus is required.
How Do Liquid Lenses Work?
Liquid lenses utilize an electrowetting process to achieve excellent autofocus functionality. The lens itself is a sealed cell containing water and oil. The electrowetting process quickly and accurately shapes the oil droplets into effective lenses. This process is continuous, reversible, and equally fast for focusing steps of any size.
The speed at which liquid lenses change their shape may seem miraculous, but it is entirely scientific. When a drop of liquid is placed on a hydrophobic surface (one that repels liquids), the molecules in the liquid come together and form a bead because they are repelled by the hydrophobic surface.
When an electric field is applied to the other side of the liquid and the hydrophobic layer (such as aluminum), the liquid is electrostatically attracted to the aluminum. The molecules that make up the liquid will spread out as they attempt to reach the aluminum, causing the water droplet to rapidly change shape. This process is called electrowetting and is a crucial foundation of liquid lens technology.
The stronger the applied electric field, the greater the attraction of the liquid to the conductive material. This means that the water will spread as far as possible to overcome obstacles, further diffusing. By changing the amount of electricity used, the liquid can be forced to take on various shapes. If this liquid is used as a lens, its different shapes will have different focal lengths, greatly altering the images captured by the sensor.
Why Use Liquid Lens Technology?
The primary advantage of liquid lenses is their flexibility, which allows them to be used simultaneously in multiple different applications. This is particularly useful in environments where mass production of objects of varying sizes occurs.
For example, a pharmaceutical company may use machine vision inspection for different types of capsules, tablets, gel films, etc. With traditional lenses, multiple imaging systems would need to be set up to inspect each product, or one imaging system would need continuously changing focal depths.
Using liquid lenses, one imaging system can perform the work of multiple imaging systems, programmable with different object distances, eliminating the need to stop production to change focal depth or set up multiple different imaging systems.
Liquid lens technology has rapidly gained popularity in the industrial sector, largely due to the flexibility it offers. Liquid lenses are highly suitable for a wide range of applications and can even provide higher image quality than many mechanical options.
FALenses Technology specializes in providing machine vision core hardware. You can go to the official website of FALenses Technology at https://www.falenses.com/ for more information.