55 results about "Köhler illumination" patented technology

A single-axis illumination system for a multiple-axis imaging system, particularly an array microscope. A single-axis illumination system is used to trans-illuminate an object viewed with an array of imaging elements having multiple respective axes. The numerical apertures of the imaging elements are preferably matched to the numerical aperture of the illumination system. For Kohler illumination, the light source is placed effectively at the front focal plane of the illumination system. For critical illumination, the light source is effectively imaged onto the object plane of the imaging system. For dark field illumination, an annular light source is effectively provided. For phase contrast microscopy, an annular phase mask is placed effectively at the back focal plane of the objective lens of the imaging system and a corresponding annular amplitude mask is provided effectively at the light source. For Hoffman modulation contrast microscopy, an amplitude mask is placed effectively at the back focal plane of the objective lens of the imaging system and a slit is provided at a source of light of the illumination system. Structured illumination and interferometry, and a secondary source, may also be used with trans-illumination methods and apparatus according to the present invention.

The invention relates to an LCD projector light source system employing three sheet LED lamp plates. The system comprises a heat radiation apparatus, a light source circuit board, a red LED light source, a green LED light source, a blue LED light source, a TIR lens, a fly-eye lens, a Kohler illumination lens group, a red LCD panel and polaroid group , a green LCD panel and polaroid group , a blue LCD panel and polaroid group, a synthesized prism and a projection objective. The TIR lens enables a light emitted by an LED to be collected to greatest extent and to be collimated; the collimated light beam is subdivided and focused by the fly-eye lens and then is projected on the LCD panels by the Kohler illumination lens group, so that uniformity of reception of the luminous energy on the LCD panels can be ensured; and the light that penetrates the LCD panels is synthesized by the synthesized prism and then is projected on a screen by the projection objective to carry out imaging. According to the invention, an LED light source is employed; the utilization of the TIR lens enables complexity of an optical path to be further reduced; therefore, an integral structure of a projector is simplified and a volume of the projector is reduced; moreover, a utilization rate of the luminous energy is enhanced to the greatest extent and a practical effect is substantial.

A spectrophotometer having an optical system for directing a beam of substantially monochromatic excitation light to a liquid sample contained in a well (3) of a well plate for interaction with the sample for absorption or emission measurements to analyse the sample. The optical system includes two apertures (46, 28) for establishing a Kohler illumination region outside the well, that is an excitation beam region between conjugate images (18, 21) of the two apertures. This excitation beam region is then demagnified and imaged (10, 9) into the well (3). The invention provides for the shape of the Kohler illumination region to correspond to the shape of the well space so that all of the liquid sample is uniformly illuminated without the well obstructing any portion of the illuminating excitation beam of light. Advantages of the invention are that the Kohler illumination region of the excitation beam is convenient for insertion of filters (20), apertures and polarisers (19) into the excitation optical system and permits use of small and thus cheaper filters and polarisers. Also the invention provides for accurate absorption or emission measurements from a liquid sample in a well notwithstanding that the sample may only partially fill the well.