Importance

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Abstract

A radiation-image reading apparatus especially suited for reading weak X-ray diffraction images, including a radiation-image recording member formed of a support plate in the form of a disk having a phosphor layer, a light source for generating excitation light with which the phosphor layer is irradiated, a light detecting device for detecting light emitted from the phosphor layer of the radiation-image recording member when the phosphor layer is irradiated with the excitation light, the detecting device performing the detection at a position deviated from the optical axis of the excitation light, a condenser device for condensing the excitation light emitted from the light source to a point on the phosphor layer of the radiation-image recording member while changing divergent rays of light coming from the point on the phosphor layer, to which the excitation light is condensed, into parallel rays, a driving device for moving the position of the point on the phosphor layer of condensation effected by the condenser device so that the point moves relative to the disk-like support body in the radial direction of the disk, and a light reflecting member. The light reflecting member allows excitation light emitted from the light source to pass, leads the excitation light to the optical axis of the condenser device, and reflects light emitted from the phosphor layer which is changed into parallel rays by the condenser device and leads the parallel rays to the light detecting device and which includes a member serving as a total reflection mirror. The reflecting member has a total reflection surface for reflecting light in a total reflection manner formed on a surface of the reflecting member facing the phosphor layer and further having an aperture, for transmitting the excitation light, formed at its center at which the reflecting member intersects the path of the excitation light.

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First Claim