dzolens/flyeyelens repository overview

A fly-eye lens is a collection of lenses arranged vertically and horizontally. It is called a fly-eye lens because it looks like the eye of a fly (insect).

By having multiple lenses, it is possible to reduce the unevenness of the light source compared to a single lens. Compared to conventional light sources, LEDs have the problem of uneven brightness. This is why they are increasingly being used in equipment that uses LEDs.

The shape of the lens in which it is placed depends on the case. Sometimes the lenses are hexagonal, as in a honeycomb core, and sometimes they are square.

⁠Uses of fly-eye lenses

Fly-eye lenses are mainly used in optical applications, particularly in equipment where a uniform light source is required.

One of the most common applications for these lenses is in projectors. Although most people think of projectors in terms of movies, they are also used in many business applications such as PowerPoint.

The diversification of applications and the need for beautiful images has led to the development of higher brightness. The higher the luminance, the more unevenness becomes noticeable, so fly-eye lenses⁠ are used to solve this problem.

⁠The principle of flyeye lenses

A flyeye lens is not a single lens, but is made up of multiple lens layers.

The lens closest to the light source is the focus lens. The light from the source is too weak to be directed directly onto the object, so the light is converged and converted into intense energy. The distance between the lens and the area where the light converges is called the focal length. The focal length depends on the refractive index of the lens.

At the middle and opposite ends of the spectrum are the fly-eye lenses. The fly-eye lens in the middle has its convex side facing the light source. The fly-eye lens in the middle faces the convex side of the light source and is responsible for spreading the light that has been converged by the focus lens.

The fly-eye lens at the end, with its flat side facing the light source, spreads the light spread by the second fly-eye lens evenly.

More recently, fly-eye lenses have been used in research to produce holographic images. The advantages of fly-eye lenses over conventional lasers are that they can be used in full colour and in any location. However, they are expensive.

For more information about industrial lenses, please visit https://www.dzoptics.com/en/⁠