Hoya Colour Glass Filters
Hoya corporation manufactures and markets the hightest quality monolithic colour filter glass encompassing a wide range spectral haracteristics 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:
- Polished 165 x 165 x 2.5 mm
- Polished 50 x 50 x 2.5 mm
- Unpolished 165 x 165 x 4-5 mm
*Custom thicknesses as lowm as 0.5 mm are available upon request.
- Custom sizes and thickness are readily available
- Wide range of coatings can be applied
- Thermal strengthening
- Stringent tolerances and surface finish
- Machine Vision
- CRT Displays/ LCD/ FED
- UV Trans-Illuminator
- Electronic Instrumentation
- Night Vision
- Medical Devices
Filter Glass Types
Sharp Cut Filters
Sharp cut filters are defined as filters than cut off as much as possible of wvelength light shorter than a specific wavelength, while transmitting as much of longer wavelength light as possible, within a wavelength range of 259 nm to 800 nm.
Infrared Transmitting Filters
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 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-colour separations, selection of wavelengths and colour compensation.
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 maximum value.
Light Balancing Filters
Amber filters are used to lower colour temperature by shifting Mired value from +20 to +200. Blue filters are used to raise colour temperature by shifting Mired from –20 to –200.
Colour Compensating Filters
Colour compensating filters control light in the blue, green and red regions of the visible spectrum, and include the cyan series and magenta series.
Neutral Density Filters
These filters possess level spectral transmission 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
These slightly bluish glass filters feature high transmittance in the visible region and good absorption of heat rays.(infrared rays)
Ultaviolet Transmitting, Visible Absorbing Filters
These are dark glass filters, nearly black, which transmit the ultraviolet region but absorb the visible spectrum. They transmit slightly in the near-infrared region.
Multiband Calibration Filters
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 colour-type filter.