Abstract: A visual inspection device including a pinhole lens optically coupled to a sensor is provided. The pinhole lens has a pinhole placed at the distal end of the lens to capture the rays from an object to be inspected, a front optical group receiving the rays which cross the pinhole, and a rear optical group. The front optical group is configured to focus, on the rear optical group, the rays which cross the pinhole. The rear optical group is configured to focus, on the sensor, the rays received from the front optical group.

Abstract: A lens device for inspecting an object having at least one end surface and at least one lateral surface, substantially orthogonal to the end surface, is provided. The lens device includes a front optical group, a rear optical group acting as prime lens for collecting beams originating from the front optical group, a stop inserted in the rear optical group, and a sensor plane collecting beams projected by the rear optical group. The front optical group includes only refractive lenses and is formed by at least one front lens configured to receive beams both from the at least one end surface of the object, perpendicular to the optical axis, and from the at least one lateral surface of the object, substantially parallel to the optical axis, and by one or more converging lenses arranged behind the front lens and suitable to focus the beams received towards the rear optical group.

Abstract: A visual inspection device including a pinhole lens optically coupled to a sensor is provided. The pinhole lens has a pinhole placed at the distal end of the lens to capture the rays from an object to be inspected, a front optical group receiving the rays which cross the pinhole, and a rear optical group. The front optical group is configured to focus, on the rear optical group, the rays which cross the pinhole. The rear optical group is configured to focus, on the sensor, the rays received from the front optical group.

Abstract: A borescope probe for inspecting a side wall of a cavity includes a primary mirror, a main refractive optical group, a stop, and a sensor plane. The primary mirror collects light rays diffused by a surface of the side wall of the cavity according to an inlet angle (?) and reflects the light rays towards the refractive optical group. The main refractive optical group is placed between the primary mirror and the sensor plane and is suitable to receive the light rays reflected by the primary mirror and focus them on the sensor plane.