Optical filter, optical filter module, spectrometric measurement apparatus, and optical apparatus

Abstract

An optical filter includes a first variable wavelength bandpass filter that extracts light of a first wavelength band and has first and second spectral bands and a second variable wavelength bandpass filter that extracts light of a second wavelength band adjacent to the first wavelength band and has third and fourth spectral bands. Part of the period during which the light of the first spectral band is extracted overlaps with the period during which the light of the third spectral band is extracted, and part of the period during which the light of the second spectral band is extracted overlaps with the period during which the light of the fourth spectral band is extracted.

What is claimed is: 
     
         1 . An optical filter comprising:
 a first variable wavelength bandpass filter that is driven during a first period;   a second variable wavelength bandpass filter that is driven during a second period,   the first period overlapping the second period.   
     
     
         2 . The optical filter according to  claim 1 ,
 the first variable wavelength bandpass filter extracting light of a first wavelength band,   the second variable wavelength bandpass filter extracting light of a second wavelength band.   
     
     
         3 . The optical filter according to  claim 1 ,
 the first variable wavelength filter being driven by a first signal,   the second variable wavelength filter being driven by a second signal.   
     
     
         4 . The optical filter according to  claim 3 ,
 a driver outputs the first signal and the second signal.   
     
     
         5 . The optical filter according to  claim 3 ,
 the first signal being output from a first amplifier,   the second signal being output from a second amplifier.   
     
     
         6 . An optical filter module comprising,
 the optical filter according to  claim 1 .   
     
     
         7 . An optical apparatus comprising:
 the optical filter according to  claim 1 .