UV exposure optics

Home Pfeil Products Pfeil Optics Pfeil UV exposure optics Pfeil

UV exposure optics


for the exposure of printed circuit boards



As the world's biggest supplier of optical devices for UV-exposure equipment for the manufacture of circuit boards, Plan Optik offers a wide range of products in this field: glass mask holders, collimation mirrors, cold-light mirrors, deflection mirrors, collimator lenses and heat reflection filters.


UV exposure optics


Glass mask holders (exposure plates)


These exposure plates serve as carriers for the membrane mask used in the exposure of printed circuit boards. Thanks to the chemical or thermal stability they guarantee a high degree of operating safety and performance.

To manufacture of these mask holders Plan Optik uses a special white UV-permeable glass of the highest quality, which is optimized with regard to low material inclusions and top surface quality. Compared with the standard soda-lime float glass previously in general use this material demonstrates a considerably higher degree of UV-transmission. This permits up to a 10 % reduction in the processing time needed for the exposure of the circuit boards.


Material UV exposure glass (PCB)
Dimensions Up to 1500 mm x 1000 mm
Quality levels (grades)

Grade 1 (Standard quality for non-collimated light)
max. scratch width: 0.06 mm
max. size of inclusions: 0.40 mm

Grade 2 (High-end quality for non-collimated light)
max. scratch width: 0.04 mm
max. size of inclusions: 0.20 mm

Grade 3 (Standard quality for collimated light)
max. scratch width: 0.03 mm
max. size of inclusions: 0.10 mm

Grade 4 (High-end quality collimated light)
max. scratch width: 0.02 mm
max. size of inclusions: 0.06 mm
Options Grooves, thru-holes, blind holes, steps according to customer specification

Collimation mirrors (spherical mirrors)


These spherical mirrors permit the deflection and at the same time the collimation of the UV light within the lighting system. A high-precision polishing process permits the adjustment to different radiuses of curvature.


Material Soda-lime float glass
Dimensions Up to 1100 mm x 1100 mm
Thickness 12 mm (standard) - other thicknesses available upon request
Radius of curvature 2800 mm (standard) - other radiuses available upon request
Surface Mirror surface optically polished
Coating Aluminum with amplifying layer and quartz protective layer
optimized for UV light (365-435 nm)

Cold-light mirrors


These plane mirrors serve to ensure the fractionation of the required UV sector of the light and the infra-red radiation (heat). The use of special dielectric layers optimized for the UV sector leads to maximum heat transmission and at the same time a virtually loss-free UV reflection.


Material Heat-resistant borosilicate glass or glass ceramics
Dimensions Up to 700 mm x 700 mm
Thickness 1 - 6 mm
Surface Optically polished if required
Coating Dielectric UV cold-light coating
optimized for UV light (365-435 nm)

Deflection mirrors


These plane mirrors are preferred for exposures on both sides, since they can be integrated into the optical path if required. The use of a special aluminum coating optimized for the UV sector results in a maximum, virtually loss-free UV reflection.


Material Soda-lime float glass or heat-resistant borosilicate glass
Dimensions Up to 850 mm x 750 mm
Thickness 1 - 6 mm
Surface Optically polished if required
Coating Aluminum with amplifying layer and quartz protective layer
optimized for UV light (365-435 nm)

Collimator lenses ("fly eyes")


These lens systems consist of single lenses bonded together so as to be resistant to high temperatures. Within the lighting system they serve to homogenize the UV light.


Material Heat-resistant quartz glass
Composition Array of single lenses - e.g. 5x6 or 6x7 single lenses
Dimensions Typically 50 - 100 mm edge length
Thickness Typically 6 - 8 mm
Surface optically polished
Coating Dielectric thermal insulation coating
optimized for UV light (365-435 nm)

Heat reflection filters


In UV lighting systems these filters serve to reduce the heat from radiation if the use of cold-light mirrors is either not desired or not possible. A dielectric coating designed for maximum UV transmission reduces the transmission of infra-red radiation. These filters are employed for preference in non-collimated lighting systems.


Material Heat-resistant borosilicate glass
Dimensions Up to 700 mm x 700 mm
Thickness 2 - 6 mm
Surface Optically polished if required
Coating Optional anti-reflex coating to increase transmission