Teijin Limited

Takayuki Ishizaki

Makoto Yoshida

Kenji Morimoto

Kiyoshi Chiba

Masahiko Sekiya

Hitoshi Nakamura

Yasuki Hanaoka

A bone data measurement method and apparatus, using an X-ray picture film having a picture of the sample bone and a picture of the standard matter having gradational steps therein, e.g., an aluminum step wedge, in which a cursory reading of the pictures of the X-ray film is implemented through detection of a quantity level of light that transmits through the X-ray picture film, determining the maximum quantity level ICmax of the transmitting light that transmits through the examined region of the picture of the sample bone, minutely reading the picture of the standard matter so as to find a thickness portion R.sub.1 of the standard matter, in which thickness portion a quantity level of transmitting light that transmits through the thickness portion is larger than and close to ICmax, and adjustably changing illuminating light for illuminating the X-ray picture film so that the quantity level I.sub.R1 of the transmitting light transmitting through the thickness portion R.sub.1 of the standard matter is within a predetermined quantity range of light. A temperature compensation for an output from the transmitting light detecting unit, i.e., a CCD image sensor is carried out by utilizing a light shielded output from the CCD image sensor.

Method of and apparatus for bone measurement

An optical recording medium comprising a transparent dielectric layer as a protecting and/or enhancing layer is provided, wherein the transparent dielectric layer is made of an oxide of at least one metal selected from the group consisting of indium, tin and tantalum, the oxide further containing at least one element selected from the group of nitrogen and bismuth. This transparent dieletric layer has an excellent adhesivity to a resin substrate, a low internal stress, and a high refractive index.

Optical recording medium

Growing community of inventors

Toyonaka, Japan

Takayuki Ishizaki