The present invention includes an illumination source, at least one illumination symmetrization module (ISM) configured to symmetrize at least a portion of light emanating from the illumination source, a first beam splitter configured to direct a first portion of light processed by the ISM along an object path to a surface of one or more specimens and a second portion of light processed by the ISM along a reference path, and a detector disposed along a primary optical axis, wherein the detector is configured to collect a portion of light reflected from the surface of the one or more specimens.

Optics symmetrization for metrology

PROBLEM TO BE SOLVED: To provide a transmission type display device that allows external light having a polarization characteristic to be recognized without extreme reduction in luminance or coloring even when configuring a see-through type optical system employing materials different in a reflection transmission characteristic with respect to polarized light.SOLUTION: After a transmission type display device is put into a state where a polarization characteristic of external light HL is resolved by an adhesion layer CC serving as a polarization resolution member PC arranged on an external side distant from a light guide area of video light GL, the video light GL and the external light HL are configured to be visually recognized with the video light GL and the external light HL overlapped in a half mirror layer 15 serving as a semi-transmission reflection part.SELECTED DRAWING: Figure 4

Transmission type display device

PURPOSE:To reflect one split piece of luminous flux odd times and the other split piece of luminous flux no time or even times, to emit them from an optical multiplexing means, and to remove a shift in the position of the light beam from a light source and variation in its traveling direction optically by guiding the reflected light and transmitted light of incident luminous flux by split light guiding means which are equal in optical path length from the splitting of the two pieces of luminous flux to their multiplexing CONSTITUTION:A luminous flux optical means consisting of a 1st beam splitter 1 splits the incident luminous flux L0 into the reflected light and transmitted light and a 2nd beam splitter 2 as a luminous flux multiplexing optical means reflects one of two split pieces of luminous flux and transmits the other to multiplex both of them Further, the split luminous flux guiding means consisting of reflecting mirrors 3-7 reflect the two split pieces of luminous flux and guide them to the multiplexing optical means so that the optical paths from the splitting to the multiplexing are equal in length Then the number of times of reflection along an incidence plane including the two split pieces of luminous flux is odd as to one split piece of luminous flux and zero or even as to the other

Luminous flux stabilizing device

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Luminous flux stabilizing device