Optical transmission of "IR filters" on camcorder CCD's?

[dr.ir. A.J.P. Theuwissen]

Posted to CCD-world:
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Dear Mr. Sutherland,


You are fully correct that for ALL CCD applications in consumer fields,
IR blocking filters are used.  A typical example is the C500 filter made
by HOYA.  But different manufacturers of the CCD cameras are using
different filters.  The IR-filter should be more or less tuned to the
colour filter characteristics of the on-chip filters.

Kind regards,

Albert Theuwissen,
R&D manager Imaging Devices, Philips Semiconductors

Sutherland, Scott wrote:
> 
> Posted to CCD-world:
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> Hello:
> 
> I have read that on commercial camcorders a filter is used
> to block NIR light from the CCD.  Does anyone know who
> manufacturers these filters?  Can someone point me to a
> optical transmission curve of these filters so I can see the
> % transmission in the visible, the cutoff wavelength/slope,
> and the effective blocking in the NIR?
> 
> Thanks for any information.
> 
> Dr. Scott Sutherland
> Senior Scientist
> GAMMA-METRICS
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