Fuji Photo Film Company, Limited

Asahi Glass Company, Limited

Ryusuke Morita

Hiroyuki Sato

Takuya Nakagawa

Masaaki Takata

Kei Iwata

Hitoshi Yauchi

The present invention relates to an optical member for deep ultraviolet having a wavelength of 250 nm or shorter, containing a synthetic silica glass which does not substantially contain a halogen element, has a maximum OH group content of less than 10 ppm by weight, has contents of ODC (oxygen deficient centers) and E-prime center of each less than 1&#xd7;10cm, does not substantially contain SiH and peroxy linkage, and has a fictive temperature of 1,050&#xb0; C. or lower.

Optical member for deep ultraviolet and process for producing same

An ink jet head which enables using plural types of ink in the head to accommodate varying types of paper or objects to be imprinted. The single ink jet head includes plural cartridges which are selected in accordance with the property of the medium which is imprinted or the ink finish which is desired. The ink jet head includes a discharge element which is excitable under a controller to comply with the characteristics of the type of ink sensed by detecting the electrical conductivity of the ink.

Ink jet printing device

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Tokyo, Japan

Ryusuke Morita