IR cut-off filter

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Infrared (IR) cut-off filters are used with color CCD or CMOS imagers to produce color images.  An IR cut-off filter blocks the transmission of the infrared while passing the visible.  This can be done with two optical techniques: absorption or reflection.  Absorptive filters are made with special optical glass that absorbs near infrared radiation.  Reflection type filters are short-pass interference filters that reflect infrared light with high efficiency.  We offer two types of absorptive filters: IRC20 and IRC21 and two types of reflective IR filters: IRC30 and IRC40.  The standard IRC30 filter offers cut-off wavelength at 640nm (+/-10nm), and it blocks all wavelength above this up to about 1100nm ( the limit of silicon response). The IRC40 is a new type of reflective filter suitable for security cameras.  It allows both visible and infrared LED light to pass through.  This allows the camera to see a color image during day light and a monochrome image at night time with infrared LED illumination.  IRC20 type is recommended for CCD imagers while the other types are more suited for CMOS imagers. The standard sizes are listed below.  Other sizes can be custom ordered.

General Specifications:

Parameter Value
Default unit mm
Default effective aperture 90%
Material Schott D263T or BK7 equivalent for coating filters
Absorptive optical glasses for absorptive filters
Dimensional tolerance: +/-0.1mm typical
Thickness(mm): Coating filters: Schott D263T glass: 0.3, 0.5, 0.7 and 1.0mm.  Other thickness available for BK7 glass
Absorptive filters: determined by the absorption requirement
Surface quality 60/40 scratch/dig.  Grade 20/10 or better is also available on custom basis.
Spectral transmittance (typical values, not specifications)  

PN Description Type Size Thickness UnitPrice OrderOnline
IRC20-10R Absorptive IR cut-off filter for CCD Absorptive Diameter 10.0 2 $12.5 Order
IRC20-10S Absorptive IR cut-off filter for CCD Absorptive 10.0 x 10.0 2 $12.5 Order
IRC21-12R Absorptive IR cut-off filter for CMOS Absorptive Diameter 12.0 1.2 $17.5 Order
IRC21-25R Absorptive IR cut-off filter for CMOS Absorptive Diameter 25.0 1.2 $30 Order
IRC21-25S Absorptive IR cut-off filter for CMOS Absorptive 25.0 x 25.0 1.2 $30 Order
IRC21-50R Absorptive IR cut-off filter with AR coating for CMOS Absorptive Diameter 50.0 1.2 $39 Order
IRC21-8R Absorptive IR cut-off filter for CMOS Absorptive Diameter 8.0 1.2 $12.5 Order
IRC21-JB450-BBAR-12Rx2.2 Absorptive IR cut-off filter and bandpass filter, S1/S2 coated BBAR for visible Absorptive Diameter 12.0 2.2 $60 Order
IRC30-10R Reflective IR cut-off filter for CMOS Reflective Diameter 10.0 1 $17.5 Order
IRC30-15x15 Reflective IR cut-off filter for CMOS Reflective 15.0 x 15.0 1 $21 Order
IRC30-15x15-20/10 Reflective IR cut-off filter for CMOS, Surface Quality: 20-10 scratch-dig Reflective 15.0 x 15.0 1 $39 Order
IRC30-25R Reflective IR cut-off filter for CMOS Reflective Diameter 25.0 1 $25 Order
IRC30-50x50 Reflective IR cut-off filter for CMOS Reflective 50.0 x 50.0 1.5 $39 Order
IRC30-6R DISCONTINUED! Specially priced until out of inventory. Reflective IR cut-off filter for CMOS, Dia=6, t=1 Reflective Diameter 6.0 1 $12.5 Order
IRC30-7x7 DISCONTINUED! Specially priced until out of inventory. Reflective IR cut-off filter for CMOS Reflective 7.0 x 7.0 1 $12.5 Order
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