Tsutomu Akagi

Title: Tsutomu Akagi and Semiconductor Light-Emitting Innovations.

Introduction

Tsutomu Akagi is an inventor based in Tokyo, Japan, whose patent work includes semiconductor light-emitting technology. His listed portfolio includes 5 patents, and the supplied information identifies Stanley Electric Co., Ltd. as his company.

Latest Patents

Akagi’s latest listed patent is titled “Semiconductor Light Emitting Apparatus.” The invention combines multiple LED chips with a phosphor layer designed to reduce variations in luminance and chromaticity.

The LED chips are arranged with gaps between them, while the phosphor layer bridges the gaps across the chips’ upper surfaces. The layer may have a uniform thickness or be thinner over the gaps, and it can be formed continuously over the chip array without filling the spaces between the chips. This arrangement is intended to limit optical variations associated with the gaps and phosphor material between the chips.

The supplied data lists the same patent description twice, so it is presented here as one invention rather than as two distinct patents.

Career Highlights

Akagi’s listed patent activity reflects work on LED apparatus design, particularly the arrangement of semiconductor light-emitting devices and phosphor layers. The supplied information associates his work with Stanley Electric Co., Ltd.

Collaborations

The supplied information names Yasuyuki Kawakami and Shuichi Ajiki as Akagi’s coworkers. It does not specify their roles in the listed patent or establish that they were co-inventors.

Conclusion

Tsutomu Akagi’s listed invention addresses a practical challenge in LED design by using a carefully arranged phosphor layer to help improve consistency in luminance and chromaticity.