Construction of objective
View Patent ↗A construction of an objective is configured which includes a plurality of lens groups including at least one cemented lens group; a plurality of inner frames to hold the lens groups, each including a contact projection; and a tube to hold the plurality of inner frames stacked inside. At least one cemented lens group is secured to the inner frames by causing the periphery of a cemented surface between cemented lenses to come into contact with the contact projection.
1. A construction of an objective, comprising:
a plurality of lens groups including at least one cemented lens group;
a plurality of inner frames to hold the lens groups, each including a contact projection; and
a tube to hold the plurality of inner frames stacked inside;
wherein a periphery of a cemented surface of the cemented lens group is caused to come into contact with a respective one of the contact projections, so that the cemented lens group is adhered to the corresponding inner frame in such a manner that an eccentricity of the cemented lens group is offset.
2. The construction of the objective according to claim 1 , wherein the periphery is a portion of the cemented surface where lenses which constitute the cemented surface are not in contact with each other.
3. The construction of the objective according to claim 1 , wherein the cemented surface is a convex surface.
4. The construction of the objective according to claim 3 , wherein the cemented surface is an optical surface of a convex lens.
5. The construction of the objective according to claim 4 , wherein the cemented surface is an optical surface of a central lens of a triplet cemented lens.
6. The construction of the objective according to claim 5 , wherein the cemented surface is one of two cemented surfaces of a triplet cemented lens, with a lower height of light passing therethrough.
7. The construction of the objective according to claim 1 , wherein the cemented surface is a cemented surface between two lenses having outer diameters which differ from each other by at least 10%.
8. The construction of the objective according to claim 1 , wherein the cemented surface has a curvature radius of the periphery different from that of a portion of contact between lenses which constitute the cemented surface.
9. The construction of the objective according to claim 1 , wherein the cemented lens group is a cemented lens group in which a height of light incident on an incident end and a height of light emitted from an exit end differ from each other by at least 10%.
10. The construction of the objective according to claim 1 , wherein the cemented lens group is one of two lens groups with concave surfaces facing each other.
11. The construction of the objective according to claim 1 , wherein the cemented lens group is a movable lens group.
12. The construction of the objective according to claim 1 , wherein:
outer diameters of the plurality of inner frames are substantially identical with an inner diameter of the tube; and
the tube holds the plurality of inner frames stacked inside, the plurality of inner frames being inserted from a side of an abutting joint.
13. The construction of an objective according to claim 1 , wherein the construction of the objective is adapted for use in a microscope.