US 11,726,298 B2
Lens device
Claudio Sedazzari, Mantova (IT)
Assigned to OPTO ENGINEERING S.P.A., Mantova (IT)
Filed by OPTO ENGINEERING S.P.A., Mantova (IT)
Filed on Sep. 29, 2020, as Appl. No. 17/36,804.
Claims priority of application No. 202020000005026 (IT), filed on Sep. 2, 2020.
Prior Publication US 2022/0066133 A1, Mar. 3, 2022
Int. Cl. G02B 9/06 (2006.01); G02B 7/04 (2021.01)
CPC G02B 9/06 (2013.01) [G02B 7/04 (2013.01)] 18 Claims
OG exemplary drawing
 
1. A lens device for inspecting an object having at least one end surface and at least one lateral surface, substantially orthogonal to the at least one end surface, the lens device comprising:
a lens device body which develops along an optical axis (X) and, carried by the lens device body, a front optical group, a rear optical group acting as prime lens for collecting beams originating from the front optical group, a stop inserted inside the rear optical group, and a sensor plane collecting beams projected by the rear optical group,
wherein the front optical group comprises 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 (X), and from the at least one lateral surface of the object, substantially parallel to the optical axis (X), and by one or more converging lenses arranged behind the at least one front lens and suitable to focus the beams received from the at least one front lens towards the rear optical group, the front optical group being configured so that an entrance pupil is external to the lens device,
wherein the at least one front lens of the front optical group comprises a first lens facing the object, the first lens of the at least one front lens being a double-convex lens that is formed as a single continuous component,
wherein the one or more converging lenses of the front optical group comprises three flat-convex converging lenses or three flat-convex doublets suitable to correct chromatic aberrations.