EXview
HAD CCD is a trademark of Sony Corporation. EXview
HAD CCD is a CCD that drastically improves light efficiency by including
near infrared light region as a basic structure of HAD (Hole-Accumulation
Diode) sensor.
In the field
of surveillance cameras and on-board cameras, there are needs to film with
high sensitivity in not only light but also in dark environments.
To answer these needs, Sony has developed the new structure "EXview
HAD CCD", which is capable of detecting with great sensitivity near infrared
light region which is unable to be discerned by the naked eye. Light
in the near infrared light region which has long wavelengths is converted
into photoelectricity deep in the semiconductor's silicon, so in conventional
CCD structure, sensors were incapable of efficiently gathering the charge
which has undergone photoelectric conversion. This "EXview
HAD CCD" structure has made it possible to use as video information the
charge of near infrared light which was hitherto invalid. This resulted
in a dramatic region improvement in sensitivity. This in turn made
it possible to film in the dark by radiating near infrared light which
is invisible to the naked eye onto the object being filmed, which opens
up applications in a broad range of applications, such as surveillance
cameras, on-board cameras and scientific measurement cameras.
Comparison of Image of EXview HAD CCD and Conventional CCD
Imaging conditions: LED illumination
in completely dark room
The graph below shows a
comparison of the spectral sensitivity characteristics of the EXviewHAD
CCD and a conventional CCD. With a wavelength of 945 nm, EXview
HAD CCD achieves sensitivity approximately 4 times that of a conventional
CCD. With regard to smears, with Diagonal 6 mm interline transfer,
an industry best of -115 dB (compared to conventional CCD -20 dB) is achieved.
Furthermore, by possessing a conventional HAD sensor structure it has a
low dark current, and it also supports electronic shutters.
Comparison of Spectral Sensitivity Characteristics of EXview HAD
CCD and Conventional CCD
