Ball Lenses

In stock
SKU
BALLL
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Grouped product items
SKU Specifications Stock Qty Price Add to cart
9354945 Coatings: None
Diameter tolerance, mm: +0/ -0.005 mm
Diameter, mm: 3
Material: BK7
Opticus comment: missing productID ref
Opticus comment: missing productID ref
PRODUCT PARAMETERS:
Sphericity: <0.003 mm
STANDARD SPECIFICATIONS (substrate):
Surface Quality: 60/40 S/D
9
€15.00
9354955 Coatings: None
Diameter tolerance, mm: +0/ -0.005 mm
Diameter, mm: 4
Material: BK7
Opticus comment: missing productID ref
PRODUCT PARAMETERS:
Sphericity: <0.003 mm
STANDARD SPECIFICATIONS (substrate):
Surface Quality: 60/40 S/D
8
€15.00
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Ball lenses are used in endoscopy, bar code readers. Lenses are made of single piece of glass  and can focus or collimate light, depending upon the geometry of the input source. Ball lenses are rarely used for imaging, so that the relevant optical characterization revolves about determination of focal lenght. Given a ball lens with diameter D, made from glass with index nL, operated in air, the effective focal length, measured from the center of the lens, is easily found from (1). Since ball lenses are very "thick" lenses, the difference between EFL and BFL is significant and can be calculated from (2). The numerical aperture depends on the aperture employed.

 

For an aperture diameter Da, where Da

(1) EFL=nD/(4(n-1)

(2) BFL=EFL-D/2

(3) NA=((nL-1)/nL)*2Da/D 

 

  • Easily positioned, since orientation is irrelevant.
  • High diameter tolerance and spherisity
  • Sapphire and ruby lenses feature high strenght, hardness and chemical stability
  • UV fused silica lenses available for use in applications where excellent UV transmission is required
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