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GOBO MATERIALS
Drix manufactures etchable aluminium-on-glass gobo materials for use in the lighting industry.
Such blank (unpatterned) gobo's consist of a substrate of borosilicate glass, covered with a metal layer and positive photoresist.
These gobo's are manufactured in various sizes to accomodate different lighting fixtures.
Patterning can be done by exposing though a film with ultraviolet light, developing and etching.
Full technical support is available for correct processing and etching with high resolution, high consistency and low defect count.
Available technologies :
- High resolution Aluminium gobo's
High Resolution Aluminium
gobo's
These gobo's consist of borosilicate glass 1.1mm with a reflective aluminium coating and photoresist.
Such gobo's can be installed with either aluminium or glass side to the objective lens, however it is preferred to use the gobo with the aluminium side to the lens and the glass side to the lamp. The aluminium coating is durable if treated carefully, and is compatible with the hottest light projectors.
Advantages :
- Very low pinhole count - no need for corrections after etching.
- Patternable down to 2.5µm resolution with high consistency (=10kdpi!)
- Very easily etchable in one step with a non-toxic acid
- Compatible with almost any aluminium etchant.
- Can be reverse mounted in all projectors
- Long lasting in heavy applications. Does not shine-though after time
- High batch to batch consistency
- Manufactured in excellent cleanroom conditions
- Available in sizes from 16mm to 105mm round.
- Excellent free technical support available
- Suitable developer and etching acid available.
- Laser etchable.
- Short lead times.
- Competitive pricing
Disadvantages :
- Not compatible with projectors which have high reflections from the objective lens.
- Generally not suitable for threatre lighting.
These gobo's consist of borosilicate glass 1.1mm with a matted hardenend aluminium coating and photoresist.
Such gobo's must be installed with the matted side to the objective lens. The matted coating will spread reflected light from the objective lens and as such suppresses a halo effect. The matted hardened aluminium coating is extremely durable, scratch proof and is compatible with the hottest light projectors.
Advantages :
- Extremely durable and scratch resistant. Almost vandal proof.
- Very low pinhole count
- Patternable down to 14µm resolution with high consistency
- Etchable in one step with a non-toxic acid
- Reduces reflections from the objective lens
- Can be reverse mounted in all but the highest power density projectors
- Long lasting in heavy applications. Does not shine-though after time
- High batch to batch consistency
- Manufactured in excellent cleanroom conditions
- Available in sizes from 16mm to 105mm round, including theatre lighting sizes
- Excellent free technical support available
- Suitable developer and etching acid available
- All standard sizes available from stock
- Competitive pricing
Disadvantages :
- Not compatible with projectors which have extreme reflections from the objective lens
- Not reverse mountable in very hot projectors
These gobo's consist of borosilicate glass 1.1mm with a hardenend aluminium coating, a black coating and photoresist.
Such gobo's must be installed with the black side to the objective lens. The black coating will absorb reflected light from the objective lens and eliminate halo effects. The forward black coating is durable and compatible with hot light projectors.
Advantages :
- Durable coating. Does not shine-though after time
- Low pinhole count
- Patternable down to 14µm resolution with high consistency
- Etchable with non-toxic acids
- Eliminates reflections from the objective lens
- High batch to batch consistency
- Manufactured in excellent cleanroom conditions
- Available in sizes over from 16mm to 100mm round, compatible with theatre lighting
- Excellent free technical support available.
- Suitable developer and etching acid available.
- Short lead times, most popular sizes will be available from stock soon.
- Competitive pricing.
Disadvantages :
- Needs two step etching, however this feature can be used to optimize the etching process
- Cannot be reverse mounted
These gobo's consist of borosilicate glass 1.1mm with a black coating on the glass, a hardened aluminium coating and photoresist.
Such gobo's must be installed with the black side to the objective lens. The black coating will absorb reflected light from the objective lens and eliminates halo effects. The reverse black coating is compatible with hot light projectors, and is ideal for builing colour gobo's, since additional colour layers can be mounted on the metal coating which points to the inside of the gobo holder.
Advantages :
- Durable coating. Does not shine-though after time
- Low pinhole count
- Patternable down to 14µm resolution with high consistency
- Usable as black&white part for multi-colour gobo's
- Etchable with non-toxic acids
- Eliminates reflections from the objective lens
- High batch to batch consistency
- Manufactured in excellent cleanroom conditions
- Available in sizes over from 16mm to 100mm round, compatible with theatre lighting
- Excellent free technical support available.
- Suitable developer and etching acid available.
- Short lead times, most popular sizes will be available from stock soon.
- Competitive pricing.
Disadvantages :
- Needs two step etching, however this feature can be used to optimize the etching process
- Cannot be reverse mounted
Available sizes :
- 16.0mm Stock : Matted Alu
- 21.5mm Stock : Matted Alu
- 22.5mm Stock : Matted Alu Reverse Black
- 25.0mm Stock : Matted Alu
- 25.5mm Stock : Matted Alu
- 27.0mm Stock : Matted Alu
- 27.9mm Stock : Matted Alu Reverse Black
- 31.5mm Stock : Matted Alu
- 36.0mm Stock : Matted Alu
- 37.5mm (E) Stock : Matted Alu Reverse Black Hi-res Aluminium
- 40.6x40.6mm Stock : Reverse Black
- 42.0mm Stock : Matted Alu
- 42.9mm Stock : Matted Alu
- 44.0mm Stock : Matted Alu
- 46.0mm Stock : Matted Alu
- 50.0mm Stock : Matted Alu
- 51.8mm Stock : Matted Alu Reverse Black
- 53.3mm Stock : Matted Alu
- 61.0mm Stock : Matted Alu
- 66.0mm (M) Stock : Matted Alu Reverse Black
- 70.0mm Stock : Matted Alu Reverse Black
- 86.0mm (B) Stock : Matted Alu Reverse Black
- 100.0mm (A) Stock : Matted Alu Reverse Black
- 105.0mm Stock : none
Glass type : high temperature resistant borofloat glass thickness 1.1mm
Standard size tolerance : +0/-0.4mm. Other sizes can be made upon request.
For nonstock items, the lead time is usually 1-2 weeks.
Benefits of standard DRIX blank gobo's :
- Glass gobo substrate : any shape can be etched without the support beams found in metal gobo's.
- High temperature resistant glass, compatible and proven with high watt density projectors.
- Possibility to etch rastered (greyscale) images down to 14 micron pixel size (900 true line pairs per inch)
- Possibility to etch rastered (greyscale) images down to 2.5 micron pixel size in Hi-res reflective Aluminium material.
- Rugged - no additional protection glass required.
- Matted aluminium layer or black layer in which the image is formed prevents false reflections between gobo and projector lens.
- Long lasting in heavy applications. Does not shine-though after time.
- Low pinhole count - all gobo's are checked to zero pinhole count prior to photoresist coating.
- High batch to batch consistency.
- Manufactured in excellent cleanroom conditions - Photoresist is applied in class 10 cleanroom conditions
- Good production capacity : ability to fulfill large orders.
- Available in sizes over 66mm, theatre lighting sizes 86mm and 100mm are readily available.
- Excellent free technical support available.
- Suitable developer and etching acids available.
- Standard sizes available from stock in matted Aluminium and Reverse Black.
- Competitive pricing.
Upon request, Drix can supply customised materials :
- Other glass diameters.
- Tight tolerance on glass diameter (standard = +0/-0.4mm, best is +0/-0.1mm)
- Square and rectangular glass shapes.
- Different glass thickness (standard = 1,1mm, on demand : 1.75mm, 2.00mm, 2.25mm, 2.75mm, 3.30mm).
- Different glass type (standard = 1.1mm borofloat glass, 1.0mm quarz on demand).
- Different matting (more or less).
- Customer specified photoresist.
- Gobo's with special coatings and without photoresist for laser etching.
CMY colour gobo's NEW NOVEMBER 2004
These gobo's consist of borosilicate glass 0.5-0.6mm with a dichroic coating of Cyan, Magenta or Yellow and photoresist.
The photoresist is deposited immediately upon the dichroic coating, and can be patterned at high resolution.
The dichroic coating itself is etchable to high resolution and has excellent temperature stability.
Three etched CMY color gobo's can be assembled on a forward or reverse black gobo to form a high resolution CMYK system.
Advantages :
- Ideal to build full colour gobo's by CMYK mixing.
- Cyan, Magenta and Yellow are matched and have less than 2% transmission when cascaded.
- Low pinhole count.
- Low stress dichroic film - compatible with hot and demanding lighting equipment.
- Glass thickness is low enough to cut down reflections and allow good focussing capabilities.
- Excellent temperature stability : less than 10nm cutoff wavelength shift @ 300°C, meaning a near invisible colour shift on the hottest projectors.
- Patternable to high resolution with high consistency.
- Will not degrade over time.
- Short lead times, good production capacity.
- Competitive pricing.
- Available in multiple sizes to accommodate various B/W gobo diameters.
These CMY gobo's can either be assembled on a forward black gobo (dichroic to the lens) or on a reverse black gobo (dichroic to the lamp)
Drix continues to develop new materials - more stuff will be announced soon.