670nm Bandpass Filter

Context: This patent describes a system for high-throughput screening of microorganisms (like yeast or bacteria) encapsulated in gel microdrops. The system uses flow cytometry to analyze the characteristics of these colonies as they pass through a laser interrogation point.

Usage of Filter: The 670nm bandpass filter is used as a specific emission filter in the optical detection path.

Function: It isolates the "red fluorescence" signal emitted by fluorochromes (likely Cy5 or APC, which emit near 670nm) while blocking the excitation laser light (often 633nm or 635nm) and other fluorescence signals (like green fluorescence at 515nm).

Result: This achieves precise quantification of the "red" fluorescent markers on the colonies, allowing the system to distinguish encapsulated colonies from debris and sort them based on specific biological criteria.

Context: This patent details an advanced fluorescence imaging system used for genomic testing (sequencing). The system requires high spatial resolution and efficient light collection from biological samples labeled with multiple fluorescent dyes.

Usage of Filter: A 670nm bandpass filter (specifically noted as having a ~50nm bandwidth in related embodiments) is used in the emission path of the imaging module.

Function: It transmits the fluorescence emission from nucleic acid labels (peaking around 670nm) to the sensor array while blocking the shorter-wavelength excitation light (e.g., 532nm or 635nm) and autofluorescence background.

Result: The filter enables the system to capture high-contrast, low-noise images of DNA clusters, which is critical for accurate base calling in high-speed DNA sequencing.

Context: This patent describes optical filters designed to enhance color vision for humans, particularly those with color blindness. It focuses on creating spectral notches to separate overlapping cone response curves.

Usage of Filter: The patent describes using narrowband absorbers that act as a multi-notch filter, with one specific absorption/filtering band centered at ~668nm (effectively 670nm).

Function: Instead of transmitting only this light, this filter often acts to regulate the red light channel. By creating a sharp transition or bandpass effect around the red cones' sensitivity, it increases the separation between red and green color signals.

Result: This achieves significantly improved color discrimination and vibrancy for the user, allowing them to distinguish between red and green hues that would otherwise look identical.