Photo-Etching, electrocasting and encoder disk and linear scale

Scale for encoder (disk/linear)

Photo-Etching, electrocasting and punching for thin plate by Meltec
HOME>Scale for encoder

As a top manufacturer of scale for encoder, we offer a wide variety of types. Disk and liner scale for incremental ablsolute are all available.
Assembly with the reinforcing plate, double-sided tape, hubs and etc. is also available. Production at overseas plant is possible.

=>For inquiry of scale for encoder, go to contact us

Disk and linear type
1.PET film (transparent/reflective)
2.Metal (transparent)
3.Hybrid...High precision metal(transparent/reflective)
4.Long linear scale (transparent/reflective)

<Newly developed>Disk and linear type
5.Polycarbonate (transparent/reflective)
6.Meltforming (reflective)
7.<Patented> Mirror black(reflective)


<Scale for encoder: position map of price and accuracy>

《Features of scale made by MELTEC》
1.No centering is needed 2.Anti-shock 3.High contrast
4.Possibley ultra small size 5.High productivity 6.Short lead time



<Scale for encoder 1-6: degree of accuracy】
T: transparent
R: reflective
Min.
bar width
Bar tolerance Pitch tolerance  Axial runout Internal dia. accuracy Reflective rate
1.PET film(T/R)  0.01 ±0.003
and under
±0.002
and under
0.01 and under  ±0.01  65% and over
2.Metal(T) ard0.08
if t=0.05
Range0.04
and under
±0.003
and under
0.01 and under Range0.04
and under(Reamer 0.01)
 -
3.Hybrid(T/R) 0.04 ±0.008 ±0.001
and under
0.005 and under ±0.008  60% and over
4.Melt-forming
 (R)
0.02 ±0.003 ±0.001
and under
0.005 and under ±0.008  65% and over
5.Polycarbonate
(T/R)
0.01 ±0.003 ±0.002
and under
0.05 ±0.1  75% and over

〖Note〗
1.PET film:Relative temp. change rate 18μm/m℃(1.8x10⁻3%/℃).
Relative humidity change rate 10μm/m(1.0x10⁻3%%RH) 2.Metal:nothing 
3.Hybrid:High resistance to heat and humidity 
4.Melt-forming:High resistance to heat and humidity. Light to shade reflactive rate is over 70%. 
5.Polycarbonate:Heat resstance 120℃

1.PET film (transparent/reflective)

Fine pattern is printed on the PET film base to make encoder disk.
Assembly with reinforcement, double-sided tape and plastic hub etc. is also available.

Transparent type

Reflective type

With double-sided tape/molding hub

Technology highlights

  • High precision of minimum bar code width0.01(pitch 0.02) is possible.
  • Achievable bar pitch tolerance within±0.002, bar code area tolerance is within±0.002
  • Disk: Center run-out within 0.015, internal diameter within±0.01, circularity within 0.01 is possible
  • Disk: Concyclic bar code difference error is within 0.005.
  • Rate of change by temperature 1x 10-3%/℃.
  • Rate of change to relative humidity 1% is 1x 10-3%.
  • Aluminum deposition for reflective type. Reflective rate 60%.

2. Metal (transparent)

Metal (SUS) is processed by photo etching to make encoder disk.
Assembly with metal and plastic hub is also available.


Assembly with hub

Encoder disk unit

Technology highlights: Fine processing <Glass master type>

  • SUS304 planarity sheet for photo etching is used.
  • Minimum bar code width is around 0.07(t=0.04)
  • Bar pitch tolerance within ±0.002, max and min difference of bar code tolerance in the same lot within 0.02.
  • Center run-out within 0.01, circularity within 0.01 is possible.
  • Internal dia. accuracy range is within 0.03 (0.01 is possible when finished with a reamer.)

Technology highlights: Standard processing <Film master type>

  • SUS304 planarity sheet for photo etching is used.
  • Minimum bar code width is around 0.08(t=0.05)
  • Bar pitch tolerance within ±0.003, max and min difference of bar code tolerance in the same lot within 0.04.
  • Center run-out within 0.015, circularity within 0.015 is possible.
  • Internal dia. accuracy range is within 0.04 (0.01 is possible when finished with a reamer.)

3. Hybrid-high precision metal(transparent/reflective)

High accuracy metal type is realized by using nickel clad material for hybrid type.
Translucent type etching dimention accuracy list

Thickness(t) Bar code min.
dimension(D)
tolerance
0.04 0.04 ±0.008
0.06 0.05 ±0.008
0.08 0.06 ±0.008
0.1 0.075 ±0.008
0.15 0.15 ±0.01
0.2 0.20 ±0.015
Reflective type etching dimention accuracy list
t Bar code min.
dimension(D)
tolerance
0.07
0.04 

±0.008 
0.10

Assembly with hub

Technology highlights

  • As Ni layer improves accuracy, high accuracy and high definition etching is possible.
  • As it has nickel clad structure, each metal layer is etched and difference between upper and lower aperture can be made with high accuracy.
  • Disk:Bar code error is within max. 0.008 on concyclic.
  • Disk: Bar pitch tolerance is within 0.003 and circularity within ±0.01.
  • Ref: high contrast between reflective and non- reflective.
  • Ref: compared to film product, insusceptible by humidity
  • Ref: reflective area more than 60% and non-reflective area less than 10%.
  • Ref: minimum bar code width 0.05 is possible.



4. Long linear scale(transparent/reflective)

Scale made of various materials are avaialble.

   Length Min.
bar code width
 PET  3m  0.01mm
 Metal(SUS)  1m  0.07mm
 Hybrid
(high precision metal)
 1m  0.04mm

Long linear scale

Long linear scale




















5. Polycarbonate type (transparent/reflective)

Trying to achieve the same precision as glass scale at low cost.

Technology highlights

  • Lower cost than glass scale, although the spec is as good as glass.
  • Crashproof and splinterless
  • Fine and high precision
  • High heat resistance(120℃)
  • Both transparent and reflaecive types are available.
  • Non-penetration bar code made of alminium is formed.



6. Melt-forming (reflective)

Integrated technogly of nickel electrocaxsting and etching process.
Pcocessing accuracy of electrocasting is maintained and high precision product of t=0.1 or more is available.

Technology highlights

  • Unique combined technology of electroforming + etching.
  • Material t=0.07 and t=0.1
  • Min.bar code width 0.02(pitch 0.04)
  • Achievable bar code tolerance ±0.002
  • Duty ratio 1:1 is possible
  • Reflective area 65% or more and non-reflective area 10% or less.



7. <Patented> Mirror black (reflective)

Patented by our unique development.
Its sus base material with high accuracy etching + low reflection black treatment.
High resolution and LD ratio (SN ratio) has been achieved.
Same spec as glass scale but low cost is available
Plastic product
Flexible form can be made, which is impossible if it is plastic product.
Utility as optical products like camera lenz module


Technology highlights

  • Same spec as glass scale but low cost.
  • Reflective type:LD ratio 65% and over has been achieved.
  • Long linear scale of mirror black is available.
  • Bar code tolerance ±0.003
Inquiry:TEL:814-7178-8800
Go to contact us