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Fuzhou Alpha Optics Co., Ltd

14Gulou Industrial Park Jinshan Juyuanzhou Fuzhou,Fuzhou,Fujian,China

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Hopkins Rod Lens


Alpha optics

( Negotiable ) Get Latest Price



5 Piece

hard paper package


200000 Piece per Month

T/T, D/P, Western Union


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Product Specification

Dia : from1.5mm-25mm Dia. Tolerance : +/-0.05mm(Standard); up to +/-0.002mm(Precision) Length : From 1.0mm to 80.0mm Length Tolerance : +/-0.1mm(Standard); up to +/-0.002(Precision) Surface Figure : 2 lambda @ 632.8nm(Standard), up to lambda/4 @632.8nm(Preci Surface Quality : 60/40(Standard); 20/10(Precision)

Product Description

Hopkins Rod Lens



The rod-lens employed in the Hopkins system consists of a singlet field lens and a doublet aperture lens which

 are both cemented onto a cylindrical rod.

Modern endoscopes typically utilise much longer lenses called Hopkins Rod Lenses than traditional

achromatic doublets as relay optics. The advantage of the rod lens designs is that the chief ray bundle

 can be confined more tightly to the optical axis by reducing the ray divergence in the air gaps between

 the lenses. This reduces vignetting, one of the most severe problems in small diameter rigid endoscopes.

The image also forms further down the endoscope tube, which reduces the number of air-to-glass interfaces

 in the system.

The mounting of rod lenses is also simpler than thin achromats. The rod lenses tend to tilt less when they are

 assembled into the inner lens tube. Also, since the spacers are shorter in a rod lens design, they can be

 made thinner which increases the clear aperture. Rod lenses are typically fine ground on their outer surface

 to reduce stray reflection.


2. Material


BK7 grade A optical glass or Fused Silica


3. Specification


Dia. From 1.5mm to 25.0mm

Dia. Tolerance: +/-0.05mm(Standard); up to +/-0.002mm(Precision)

Length: From 1.0mm to 80.0mm

Length Tolerance: +/-0.1mm(Standard); up to +/-0.002(Precision)

Surface Figure: 2 lambda @ 632.8nm(Standard), up to lambda/4 @632.8nm(Precision)

Surface Quality: 60/40(Standard); 20/10(Precision)


Contact Us

Contact Person : Helen

Company:Fuzhou Alpha Optics Co., Ltd

Address:14Gulou Industrial Park Jinshan Juyuanzhou Fuzhou, Fuzhou, Fujian, China,


Helen < Fuzhou Alpha Optics Co., Ltd >
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