A mid infrared imager for the Next Generation Space Telescope: MIRIM, the MIRI imager

MIRI is the mid infrared instrument planned for the NGST. Working in the 5 μm - 28 μm band, it includes 3 units: a spectrograph, an imager and a calibration facility. We describe here briefly MIRIM, the MIRI imager channel as it is at the end of the phase A study. MIRIM provides 3 observing modes: an imaging mode, with a Field Of View of 1.3 arcmin × 1.7 arcmin and a Pixel Field Of View of 0.1 arcsec/pixel, a coronagraphic mode and a low resolution mode for point sources, between 5 μm and 10 μm, with a spectral resolution R = λ/Δλ around 100.