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High-Sensitivity Diagonal 6.0 mm (Type 1/3) 380K/440K-Effective Pixel Color CCDs
Super HAD CCDs for Security Cameras
ICX638AKA
ICX639AKA
The Type 1/3 CCD has become the mainstream optical system in the security
camera market, where superb imaging characteristics are required.
Compared to Sony’s existing ICX408AK and ICX409AK*1, the ICX638AKA
and ICX639AKA of this release feature significantly improved sensitivity
achieved through improved condensing and optimized spectral sensitivity
characteristics.
These devices also feature improved ease of use, since in addition to the
earlier 5.0 V, they also support the use of 3.3 V for both the horizontal
transfer clock voltage and the reset gate clock voltage.
*1 Refer to CX-NEWS Vol. 23. |
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ICX638AKA
ICX639AKA |
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* Diagonal 6.0 mm (Type 1/3)
* ICX638AKA: NTSC, 380K-effective
pixels
ICX639AKA: PAL, 440K-effective
pixels
* High sensitivity (+7 dB over
existing Sony products)
New spectral sensitivity characteristics
* Support for reduced drive voltage
amplitudes (typical value: 3.3 V)
* Compatibility with existing Sony
products |
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The ICX638AKA and ICX639AKA are
products mainly designed for security
camera application and are diagonal 6.0
mm (Type 1/3) 380K/440K-pixel color
CCDs. These products provide improved
characteristics compared to the existing
ICX408AK and ICX409AK. These new
devices provide significant improvements
in the sensitivity characteristics, which are
critical for security camera applications,
while maintaining the same saturation signal
level and smear level characteristics
as the existing products. |
 High Sensitivity and New
Spectral Sensitivity
Characteristics |
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The ICX638AKA and ICX639AKA of
this release provide a significantly improved
focusing of light onto the photodiodes
due to an increased aperture ratio
and an improved upper section structure.
This suppresses the reduction in collection
ratio due to the increased angles of
incident light rays that occurs when the
lens is used at its widest aperture. Also,
by adopting new complementary color
pigments in the color filters, Sony increased
the sensitivity to the blue end of
the spectrum (shorter wavelengths) and
achieved well-balanced spectral sensitivity
characteristics. (See figure 1.)
The combination of these technological
improvements results in a significant increase
in the sensitivity characteristics that
totals +7 dB. When one compares actual
images, one can clearly see that the image
quality under the low-light conditions that
are critical for security camera applications
has been improved significantly.
(See photograph 1.) |
| Support for Reduced
Amplitude Drive Voltage |
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These products support not only the same
5.0 V (typical) level used in existing products
but also a 3.3 V (typical) level for both
the horizontal transfer clock voltage and
the reset gate clock voltage. This can have
a large effect in reducing both power consumption
and heat generation. |
| Compatibility with Existing
Sony Products |
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In these new products, Sony has achieved
compatibility by making the image size,
pixel count, drive timing, package, and pin
configuration the same as the existing
products (the ICX408AK and ICX409AK).
These new products adopt a technique in
which the reset gate DC bias is generated
by circuits internal to the CCD and thus
allow a reduction in the number of external
components associated with bias application
from the supply voltage in the
drive circuit. |
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•••• Mr. IIZUKA ••••
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While the Type 1/3 CCD has been
used for many years in a wide
range of applications, we are now
providing an even more evolved
CCD product. I strongly recommend
that you look into this high-sensitivity
CCD, which can more
than adequately respond to the
needs of customers worldwide
who require high picture quality
video. |
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See
all articles with figures and tables.  |
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Vol.49 |
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