Ngk Insulators, Inc.

Hagiwara Sys-Com Co., Ltd.

Naoki Fujita

Jungo Kondo

Keiichiro Asai

Shuhei Higashihara

Kentaro Tani

Yuji Oishi

Kimitoshi Nakamura

Kaihei Ito

Megumi Tokunaga

Kaoru Miyazaki

A waveguide device includes: a photonic crystal layer having holes periodically formed in an electro-optical crystal substrate; a line-defect optical waveguide formed in the photonic crystal layer; a first electrode arranged above the electro-optical crystal substrate, the first electrode being transparent to light; and a second electrode arranged below the electro-optical crystal substrate. Each of an optical scanning device and an optical modulation device includes the above-mentioned waveguide device.

Waveguide device, optical scanning device and optical modulation device

A USB storage device having the function of preventing stored software from being deleted by mistake achieved with as simple a structure as possible. In the USB storage device, the storage area is divided into an area in which execution of reading, writing and deleting is allowed and an area in which only execution of reading is allowed. Information to make a USB mass storage class driver recognize these areas as areas corresponding, respectively, to logical unit numbers defined in the SCSI command set of the USB mass storage class driver owned by the host is stored in the USB storage device. The information includes logical unit numbers, formats, writing/deleting allowed/not allowed flag, logical block numbers and physical block numbers. By this, the USB mass storage class driver recognizes the USB storage device as a SCSI device having two logical units.

USB storage device and program

Growing community of inventors

Nagoya, Japan

Naoki Fujita