Abstract: Disclosed herein is a lens barrel, including: plural barrel cases having holding frame portions holding optical members, respectively, and coupled to one another in a predetermined direction; and plural abutment portions made to abut against one another in a state in which the plural barrel cases are coupled to the holding frame portions, respectively, wherein the abutment portion of at least one of the plural barrel cases coupled to one another is formed in a shape protruding to the abutment portion side of the other of the plural barrel cases coupled to one another.

Abstract: There is provided a high-sensitivity organic semiconductor radiation/light sensor and a radiation/light detector which can detect rays in real time. In the high-sensitivity organic semiconductor radiation/light sensor, a signal amplification wire 2 is embedded in an organic semiconductor 1. Carriers created by passage of radiation or light are avalanche-amplified by a high electric field generated near the signal amplification wire 2 by means of applying a high voltage to the signal amplification wire 2, thus dramatically improving detection efficiency of rays. Hence, even rays exhibiting low energy loss capability can be detected in real time with high sensitivity.

Abstract: There is provided a high-sensitivity organic semiconductor radiation/light sensor and a radiation/light detector which can detect rays in real time. In the high-sensitivity organic semiconductor radiation/light sensor, a signal amplification wire 2 is embedded in an organic semiconductor 1. Carriers created by passage of radiation or light are avalanche-amplified by a high electric field generated near the signal amplification wire 2 by means of applying a high voltage to the signal amplification wire 2, thus dramatically improving detection efficiency of rays. Hence, even rays exhibiting low energy loss capability can be detected in real time with high sensitivity.

Abstract: A photographing lens apparatus includes a moveable lens frame having a shaft fixing portion to which a shaft for guiding movements of another moveable lens frame is affixed, and a lens retaining frame mounted to the moveable lens frame that integrally retains a plurality of lenses of different apertures and a predetermined diaphragm member disposed among the plurality of lenses. The shaft fixing portion is disposed such that at least a portion thereof overlaps a projected plane defined by a large aperture lens among the plurality of lenses retained by the lens retaining frame as viewed from a front face, and is also disposed in the vicinity of an outer peripheral portion of a small aperture lens among the plurality of lenses retained by the lens retaining frame.

Abstract: A photographing lens apparatus includes a moveable lens frame having a shaft fixing portion to which a shaft for guiding movements of another moveable lens frame is affixed, and a lens retaining frame mounted to the moveable lens frame that integrally retains a plurality of lenses of different apertures and a predetermined diaphragm member disposed among the plurality of lenses. The shaft fixing portion is disposed such that at least a portion thereof overlaps a projected plane defined by a large aperture lens among the plurality of lenses retained by the lens retaining frame as viewed from a front face, and is also disposed in the vicinity of an outer peripheral portion of a small aperture lens among the plurality of lenses retained by the lens retaining frame.