HOYA CORPORATION manufactures and markets the highest quality monolithic
color filter glass. Our offerings encompass a wide range spectral
characteristics spanning from the ultraviolet to the infrared region. Each
filter transmission spectrum is determined by the highest purity chemical
composition with precise control of the glass melting process. This results in
the highest degree of product consistency and reliability. The HOYA filter
glass line has earned a reputation of excellence across many industries.
Standard products are supplied in the following dimensions:
|165 x 165 x 2.5 mm
||50 x 50 x 2.5 mm
||165 x 165 x 4-5 mm
* Custom thickness as low as 0.5mm are available upon
- Machine Vision
- CRT Displays/LCD/FED
- UV Trans-Illuminator
- Electronic Instrumentation
- Night Vision
- Medical Devices
Filter Glass Types
- Sharp Cut Filters (L, Y, O,
Sharp cut filters are defined as filters that cut off as much as possible
of the wavelength light shorter than a specific wavelength, while
transmitting as much of longer wavelength light as possible, within a
wavelength range of 259nm to 800nm.
- Infrared Transmitting Filters (R,
Infrared-transmitting filters absorb most of the visible region and
transmit the infrared region. They are widely used in light sources for
such purposes as infrared warning systems and night-vision equipment.
- Blue Filters (B)
Blue Filters transmit light in the blue spectrum and are named after the
wavelength at which their transmittance attains the maximum value. They
are used for 3-color separations, selection of wavelengths, and color
- Green Filters (G)
Green filters transmit a relatively narrow wavelength band centered around
light in the green spectrum and are named after the wavelength at which
their transmittance attains the maximum value.
- Light Balancing
Filters (LA, LB)
Amber Filters (LA) are used to lower color temperature by shifting Mired
value from +20 to +200. Blue Filters (LB) are used to raise color
temperature by shifting Mired from -20 to -200.
- Color Compensating
Color compensating filters control light in the blue, green, and red
regions of the visible spectrum, and include the cyan series and magenta
- Neutral Density Filters (ND)
These filters possess level spectral transmittance characteristics in the
visible region, and are numbered with the average value of transmittances
at 10nm steps in the 400nm to 700nm range.
- Heat Absorbing Filters (HA)
These slightly bluish glass filters feature high transmittance in the
visible region and good absorption of heat rays (infrared rays).
- Ultraviolet Transmitting, Visible Absorbing
These are dark glass filters, nearly black, which transmit the ultraviolet
region but absorb the visible spectrum. They transmit slightly in the
- Multiband Calibration Filters (V, H, Y)
V-10 and V-30 contain neodymium, and HY-1, holmium. All three filters
exhibit outstanding absorption at specific wavelength. The filters are
used for wavelength calibration and V-10 as a dual-color-type filter.
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