Toshiba Ceramics Co., Ltd.

Masayuki Sumiya

Eiichi Toya

Tadashi Ohashi

Yukio Itoh

Yasumi Sasaki

A ceramic membrane device for a photomask is a ring-shaped base plate constituting a circumferential frame and having a flat front surface, an outer side surface and a rear surface, a front CVD coating supported on the front surface of the base plate and defining a flat surface on which a masking pattern is to be formed, and a rear CVD coating formed on the rear surface of the base plate. The front and rear CVD coatings are made of a silicon compound. The ceramic membrane device is made by providing a plate having a flat front surface, a side surface and a rear surface, forming a front CVD coating made of a silicon compound on the side surface and the front surface of the plate, forming a rear CVD coating made of a silicon compound on a partial area of the rear surface of the plate so that an uncoated area remains, removing the portion of the plate corresponding to the uncoated area by means of etching so that the remaining portion of the plate can function as a circumferential frame for the ceramic membrane formed by the front coating.

Ceramic membrane device and a method of producing the same

A susceptor for use in a vertical vapor growth apparatus includes a susceptor body (12) having an upper surface, a plurality of wafer receiving portions (17) formed in the upper surface of the susceptor body (12), and plates (16) fixed in the upper surface of the susceptor body (12) near the wafer setting portions (17). The plates (16) have an upper surface such that, when wafers (5) are mounted in the wafer setting portions (17), the upper surfaces of the plates (16) and the wafers (5) are positioned substantially in the same plane. The plates (16) are made of quartz glass or fused silica.

Growing community of inventors

Oguni, Japan

Masayuki Sumiya