Tatsuhiko Niina

Title: Tatsuhiko Niina: Semiconductor and Optical Device Inventor.

Introduction

Tatsuhiko Niina is an inventor associated with Osaka, Japan, and Sanyo Electric Co., Ltd. His patent work includes technologies for optical pickup systems and silicon carbide light-emitting diode devices. The available information lists 3 patents.

Latest Patents

Niina’s listed patents include “Semiconductor Laser Apparatus and Optical Pickup Apparatus Using the Same.” The invention describes an optical pickup that splits a semiconductor laser’s beam into multiple beams and directs them through optical elements toward a recording medium. A holographic optical element guides the returning beam to a photodetector while preventing it from striking the diffraction grating. The design also allows the holographic element to be positioned and fixed relative to the device mount.

Another listed invention is “Light Emitting Diode Device and Method for Producing Same.” It describes a silicon carbide diode with n-type and p-type layers, ohmic electrodes, and a substantially trapezoidal cross-section. The structure is designed with an inclined substrate surface and is supported at the p-type layer side.

Career Highlights

Niina’s listed inventions address components used in optical recording systems and semiconductor lighting. His work reflects an emphasis on device structure, optical alignment, and silicon carbide semiconductor construction. The available information associates him with Sanyo Electric Co., Ltd.

Collaborations

The listed coworkers associated with Niina are Keiichi Yodoshi and Takahiro Uetani. The available information does not specify their roles in the patents described here.

Conclusion

Tatsuhiko Niina’s listed patent work spans optical pickup apparatus and silicon carbide LED technology, illustrating contributions to both optical and semiconductor device design.