Imaging IRB Filter

IRB Filter

Materion Balzers Optics has developed a new generation of low defect infrared blocking (IRB) filters for CCD/CMOS optical sensors utilized in cellular phones, digital still cameras and PCvideo cameras. Integrated into the sensor package the filters are designed to provide the highest blocking of IR-radiation with optimized color balance. Materion Balzers Optics color neutral IRB filters replace IR-absorbing glass – increasing overall transmission and reducing assembly size and cost. Filters are available with anti-reflection (AR) coatings for maximum transmission.

Benefits

• Low defect density allows IR filter lid integration
• Cost effective solution for low cost sensors
• Excellent IR-blocking
• Reduced filter thickness for more compact CCD/CMOS devices
• Optimized spectral performance
• Steep cut-on/cut-off slopes
• Replacement of absorbing glass
• Customized designs possible

Applications

IRB filters remove infrared radiation and improve signal-to-noise ratio in CCD/CMOS systems.
Filters can be:

• Integrated in CCD/CMOS sensor package
• Placed in the optical path

Technical Data

Spectral specifications

Three basic spectral designs are available as well as specific customer designs

IRB-1

Broadband high blocking IR filter

IRB-2

High performance IR-blocking filter

IRB-3

Low cost IR-blocking filter

AR coatings

Available on second surface of IRB-2 and IRB-3 filters

Glass

e.g. low defect borosilicate glass

Size

Common CCD/CMOS and custom sizes

Thickness: e.g. 0.7 mm

Options

IRB filters can be supplied with metallic aperture defined by lithography as well as with solderable frame

T avg. > 85%  430– 600 nm

T = 50%  650±  15 nm

T abs. < 10%  720–1000 nm

T avg. < 5%  720–1000 nm

R abs. < 2% 400–430 nm

R avg. < 0.6% 430–630 nm

R abs. < 2% 630–680 nm