Patent ID: 11860352
Assignee: MACHINE VISION LIGHTING INC.
Field: Measurement (Instruments)
Classification: CPC G | IPC G

Claim 0:
1. An image observation apparatus provided with a lighting optical system for irradiating an object to be observed with an illumination light and an observation optical system for collecting object light from the object to be observed and guiding it to a detector, wherein the apparatus comprises: a filter member for dividing optical attribute of the illumination light into one or more solid angle regions; an objective lens opposed to the object to be observed; a beam splitter disposed on an opposite side to the object to be observed with respect to the objective lens and in which an illumination optical axis of the lighting optical system and an observation optical axis of the observation optical system are made coincide with each other; the filter member or a relay image of the filter member being disposed on the opposite side to the object to be observed with respect to the objective lens and near a focusing position of the objective lens on the illumination optical axis, thereby at respective points of the object to be observed, same illumination solid angles being formed; and wherein said filter member or the relay image of the filter member is disposed at a position of an aperture stop that determines a numerical aperture of said objective lens.