590nm Bandpass Filter

Context: This patent describes a system for generating images using clusters of LEDs (Light Emitting Diodes) of specific colors, including orange.

Usage of Filter: The 590nm bandpass filter is placed in the optical path of the orange LED cluster.

Function: It narrows the spectral bandwidth of the light emitted by the LEDs, which typically have a broader spectral width than lasers.

Result: This achieves a spectrally pure "Amber" or "Orange" light source, preventing crosstalk with adjacent color channels (like red or green) and improving the color gamut and contrast of the projected image.

Context: This patent details a flow cytometry system capable of detecting multiple fluorescence signals from particles (cells) labeled with different fluorescent dyes.

Usage of Filter: The 590nm bandpass filter (often specified as a range like 590/35nm or similar) is used in the fluorescence detection path .

Function: It isolates the fluorescence emission of specific fluorophores, such as Phycoerythrin (PE) or Ethidium Bromide, which emit light in the orange-yellow spectrum (approx. 575–600nm), while blocking the excitation laser light (usually 488nm or 532nm) and other fluorescence signals.

Result: This allows for the precise counting and sorting of cells tagged with these specific orange-fluorescing markers without interference from other dyes in the sample.

Context: This patent involves an imaging system that uses internal reference beads to maintain focus and calibration during automated scanning.

Usage of Filter: A bandpass filter (covering the 590nm region) is used to detect the fluorescence emitted by the reference beads.

Function: The filter ensures that the optical sensor only sees the specific wavelength emitted by the focus beads (which emit in the 590nm–640nm range) and rejects background noise or autofluorescence from the sample carrier.

Result: The system achieves continuous, automated focus maintenance, allowing for high-speed scanning of biological samples without blurring.