Prix FOB
Obtenir le dernier prix( Negotiable )
|5 Piece Minimum Order
Pays:
China
N ° de modèle:
Alpha optics
Prix FOB:
( Negotiable ) Obtenir le dernier prix
Localité:
-
Prix de commande minimale:
-
Commande minimale:
5 Piece
Packaging Detail:
hard paper package
Heure de livraison:
25-30days
Capacité de Fournir:
200000 Piece per Month
Payment Type:
T/T, D/P, Western Union
Groupe de produits :
-
Personne àcontacter Helen
14Gulou Industrial Park Jinshan Juyuanzhou Fuzhou, Fuzhou, Fujian
Hopkins Rod Lens
1.Overview
Â
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.
Â
2. Material
Â
BK7 grade A optical glass or Fused Silica
Â
3. Specification
Â
Dia. From 1.5mm to *5.0mm
Dia. Tolerance: +/*0.*5mm(Standard); up to +/*0.**2mm(Precision)
Length: From 1.0mm to *0.0mm
Length Tolerance: +/*0.1mm(Standard); up to +/*0.**2(Precision)
Surface Figure: 2 *@********************up to lambda/4
| Pays: | China |
| N ° de modèle: | Alpha optics |
| Prix FOB: | ( Negotiable ) Obtenir le dernier prix |
| Localité: | - |
| Prix de commande minimale: | - |
| Commande minimale: | 5 Piece |
| Packaging Detail: | hard paper package |
| Heure de livraison: | 25-30days |
| Capacité de Fournir: | 200000 Piece per Month |
| Payment Type: | T/T, D/P, Western Union |
| Groupe de produits : | - |
