Hitachi, Ltd.

Yoshiaki Hanyu

Kenji Tochigi

Yutaka Hiratsuka

Yoshihisa Suzuki

Takanoli Kaizuka

Mituyoshi Otake

Yoichi Hidano

A laser Raman microprobe separates a laser beam reflected by a sample and a Raman scattered light generated by the sample by a filter which transmits or reflects a light in a predetermined wavelength region including a wavelength region of the reflected laser beam and applies only the Raman scattered light separated by the filter to a single-monochromator for spectroanalysis. A high sensitivity analysis is attained by the single-monochromator.

Laser Raman microprobe

A laser Raman spectrophotometry system for analyzing a sample material by measuring spectrum of Raman scattering produced by the sample under irradiation of laser light includes a laser light source for excitation of luminescence in addition to a laser light source for the excitation of the Raman scattering, and an optical system for rendering the optical path of the laser beam for luminescence excitation to substantially coincide with the optical path of the laser beam for the Raman scattering immediately before irradiation of the specimen. Luminescence spectrum brought about by the laser beam for luminescence excitation is adjusted by adjusting the laser power to simulate the luminescence spectrum concurrently produced by the laser beam for the excitation of Raman scattering, wherein both spectra of luminescence are subtractively combined together, to thereby cancel the luminescence component and allow only the spectrum of Raman-scattered light to be measured with a correspondingly enhanced accuracy.

Laser Raman spectrophotometry system and adjustment thereof

A magnetic recording medium having a metamorphosed layer on the surface of the magnetic layer of conventional magnetic recording media, said metamorphosed layer being derived from some of a binder component included in the magnetic layer, can prevent the sticking trouble taking place between the magnetic recording medium and the magnetic head. Said metamorphosed layer can be formed by irradiation with ultraviolet rays in the course of the production of magnetic recording media at the step of coating a dispersion of magnetic particles on a flexible support or after the coating step. Said metamorphosed layer can also be formed on the surface of once produced magnetic recording media irrespective of having caused the sticking trouble by irradiation with ultraviolet rays. Suitable apparatuses for producing such improved magnetic recording media are also provided.

Method for producing magnetic recording medium

Magnetic recording medium

Growing community of inventors

Yokohama, Japan

Yoshiaki Hanyu