X-ray film picture reader

Abstract

Abstract PURPOSE:To varying >=1 of the distribution amount of light, optical filter transmittivity, etc., and to expands the dynamic range of a parallel light density measurement system by distributing transmitted light into plural pieces of luminous flux and measuring and converting them into electric signals. CONSTITUTION:Light from a light source 1 is passed through a lens 2 and limited by an input-side pinhole 3 to such a spread that necessary resolution is obtained to incident an X-ray film 4. The light transmitted through the film 4 enters a photometric system through a photometry-side pinhole 5. The luminous flux is split into two by a half-mirror 6, and luminous flux Q1 is transmitted through an optical filter 7 and then converted by an optical converter 8 into an electric signal, which is further converted into a voltage signal v1 by a current- voltage converter 10. Luminous flux Q2 is converted by a photoelectric converter 9 into a current signal, which is converted into a voltage signal v2 by a current- voltage converter 11. Pieces of density information on diffusion density values 0-4 on an X-ray film are read by the output signal of a composing circuit without any omission and spoiling spatial resolution.

Inventors

• 👤 Ken Ishikawa
• 👤 謙 石川
• 👤 Mitsuru Ikeda
• 👤 満 池田
• 👤 Shigeru Watanabe
• 👤 滋 渡辺

Bibliographic Details