Telecentric illumination system
AssigneeNippon Kogaku K.K.
InventorHideo Hirose
Life of this patent
Estimating the term…
Abstract
A telecentric illumination system for telecentrically illuminating an object includes a light source, optical means for telecentrically supplying a light beam from the light source to the object, and an auxiliary condenser removably disposed between the optical means and the object to be illuminated. The auxiliary condenser has a first and a second lens group disposed with a spacing therebetween corresponding to the sum of the focal lengths thereof. Thus, when the auxiliary condenser is inserted between the optical means and the object to be illuminated, there is achieved a telecentric illumination of higher magnification than the illuminated condition by the optical means.
Claims5
A telecentric illumination system for telecentrically illuminating an object, comprising:
- telecentrically illuminating optical means having a light source and field stop means for substantially restricting the object field to be illuminated, said optical means supplying a parallel light beam to said object and forming an image of said field stop means on said object, and
- an auxiliary condenser lens means removably disposed between said telecentrically illuminating optical means and said object, said auxiliary condenser lens means having a first convergent lens group and a second convergent lens group disposed with a spacing therebetween corresponding to the sum of the focal lengths thereof, and said auxiliary condenser lens means forming an image of said light source between said first and said second convergent lens groups and maintaining the image of said field stop means on the object when said auxiliary condenser lens means is inserted between said telecentrically illuminating optical means and said object to be illuminated.
An auxiliary condenser lens assembly to be used in a telecentric illumination system for telecentrically illuminating an object, the system comprising telecentrically illuminating optical means which has a light source and field stop means for substantially restricting the object field to be illuminated, supplies a parallel light beam to said object and forms an image of said field stop means on said object, said auxiliary condenser lens assembly comprising a first convergent lens group and a second convergent lens group disposed with a spacing therebetween corresponding to the sum of the focal lengths thereof,
- said auxiliary condenser assembly being removably disposed between said telecentrically illuminating optical means and said object, and forming an image of said light source between said first and said second convergent lens groups and maintaining the image of said field stop means on the object when the auxiliary condenser lens means is inserted between said telecentrically illuminating optical means and said object to be illuminated.
Dependencies are inferred from the claim text.