Kodenshi (Kyoto Prefecture) has developed an ultra-compact RGB laser light source module to be installed in smart glasses. This module has an internal silicon substrate with an optical waveguide structure that can couple laser light, and is characterized by being less than one-tenth the volume of general modules. This makes it one of the smallest in the world. Sample shipments are scheduled for around December, and we are aiming for annual sales of 1 billion yen within a few years.
The RGB laser light source module mixes red (R), green (G) and blue (B) three laser lights to express various colors. Conventionally, a spatial optical system that mixes light by incorporating a mirror and a beam splitter that divides light into the module was used, but there was a limit to miniaturization. In the module developed this time, miniaturization was achieved by incorporating the same function on a silicon substrate.
Micro-electro-mechanical system (MEMS) process technology was applied to the development of this module to create an optical waveguide structure on a silicon substrate. A light-coupled chip was developed and incorporated into the module. The module measures 8.5mm wide x 12mm deep x 3.6mm high and weighs 0.4g. This module is expected to be used not only in smart glasses, but also in microprojectors for retinal projection and industrial light sources.
The price is undecided at this time, but we expect that in the future it will be cheaper than modules that use conventional mirrors. For the spread of smart glasses, miniaturization, weight reduction and cost reduction are essential. Therefore, Citizen Electronics and TDK are also working on the practical application of ultra-compact light source modules.
for more info:https://www.kodenshi.co.jp/top/2023/05/post-13303/