Perfecting Your Light ®




Reynard Corporation serves the medical industry through support and development of custom optical components used in sensing and imaging instrumentation.

precision optical components and thin-film coatings

Heated Windows:

Optical windows can be heated by applying a conductive coating to one surface and passing a current across the window. These conductive coatings are transparent in the wavelength spectrum of interest and are typically made of Indium Tin Oxide (ITO) or thin metals.  ITO is hard, durable and will meet most Mil Spec requirements.  Thin metals are also robust, highly conductive, and are designed to be transparent in the required wavelength band.  The coatings can be deposited as a continuous plane, or be patterned with added solderable bus bars.

One example application is to apply a heated window conductive coating to the distal lens of an endoscope for laparoscopic surgery.  Due to the differences in generated body heat/humidity and the room environment, it is common for an untreated lens to fog.  In order to prevent this fogging, a conductive coating is added and the window is heated between 37 and 42 degrees C.  37 degrees C is needed to prevent fogging and 42 degrees C is the upper limit to prevent tissue damage.

Anti-Reflection Coatings:

Anti-reflection (AR) coatings are used throughout the medical industry to increase the amount of light that passes through an optical system.  On normal glass, an uncoated optical surface can reflect 4% of the light, almost 8% from both surfaces of a single optical element.  For a 5 element optical system, 1/3 (33%) of the available light is lost due to surface reflections. A commercial grade AR coating can reduce the single surface reflection to 0.5% or less.  As a result, the same 5 element optical system would lose only 5% of the light from reflection.  Precision AR coatings can achieve even better performance.  Hence, all windows and lenses that are used in medical instruments are AR coated. This list of instruments includes: Spectrometers, Operating microscopes, pathological microscopes, stereoscopic microscopes, etc.

Calibration Filters:

ND filters are used to reduce the amount of transmitted light evenly across a specified wavelength band.  These filters are critical during color imaging when the entire viewing spectrum needs a uniform density reduction in transmitted light.  These filters are calibrated to a known central wavelength regardless of the spectral range of interest, from the UV to the Far IR.

Resolution Targets:

These targets are custom made utilizing a high-precision photolithography process.  Any pattern can be realized down to geometries of about 5 microns.  These patterns are used as a distance measurement reference or for tuning an imaging system for resolution, contrast, and focus.

Vein Viewer:

optical manufacturing for medical equipmentVein Viewer technology captures the subject’s veins by an infrared camera and project the image back onto the patient’s skin in real time. Doctors can then treat varicose and other vein problems in real time.

Color Calibration:

Color calibration filters are commonly used to calibrate medical instruments or to produce a required color or spectrum.  A calibration filter includes the many various types of dielectric optical filters, such as narrow bandpass filters, notch fitlers, longwave pass filters, and shortwave pass filters.

Energy Splitting Filters:

Cube and plate beamsplitters are used to separate one beam into two or more beams. These energy splitting filters can be supplied for almost any wavelength, size and all degrees of polarization.

Step & Gradient Filters:

Step and gradient filers are used to control the amount of light getting into optical instruments. They can be used to preventing detector saturation, intensity comparison and instrument calibration.