Abstract An objective consisting of five lens members. The first two lens members are menisci curved towards the object, the first lens member having collective refractive power and the second lens member being composed of at least two separate lenses. The third and fourth lens members have a collective effect and consists of several individual lenses. The fifth lens member is a meniscus with dispersive refractive power, cemented from several separate lenses and curved towards the image. The invention contemplates that the third lens member includes a cemented surface curved towards the image and of stronger curvature than the other cemented surfaces in this lens member, the refractive index nd of the lens adjoining this surface on the image side being smaller than the lens adjoining it on the object side, while the opposite relationship applies as regards the Abbe numbers gamma of these lenses.
Inventors
👤 Ludwig Bertele
Bibliographic Details
Application Number—
JurisdictionUS
Data Sourcegoogle_patents
Last Synchronized2026-11-03 07:25
CPC Classifications
G; G02; G02B; G02B9/00; G02B9/34; G02B13/00
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
184 words
An objective consisting of five lens members, said objective viewed from the side of the object consisting of: a. a first lens member constituting a collecting meniscus curved towards the object; b. a second lens member constituting a meniscus curved towards the object and composed of at least two lenses; c. a third lens member consisting of a cemented collecting lens and a dispersing lens, both the refractive index and the colordispersing power of the glass of the collecting lens being greater than that of the next successive dispersing lens and the cemented surface possesses the smallest radius of curvature of all lens surfaces of the objective; d. a fourth lens member possessing collective refractive power and composed of at least three individual lenses, two collecting lenses enclosing a dispersing lens; and e. a fifth lens member constituting a meniscus of dispersive refractive power and curved towards the image, said fifth lens member possessing at least one cemented surface Curved towards the object and having a refractive index at the side of the image which is smaller than at the side of the object.
Claim 2
Dependent Claim
184 words
An objective consisting of five lens members, said objective viewed from the side of the object consisting of: a. a first lens member constituting a collecting meniscus curved towards the object; b. a second lens member constituting a meniscus curved towards the object and composed of at least two lenses; c. a third lens member consisting of a cemented collecting lens and a dispersing lens, both the refractive index and the colordispersing power of the glass of the collecting lens being greater than that of the next successive dispersing lens and the cemented surface possesses the smallest radius of curvature of all lens surfaces of the objective; d. a fourth lens member possessing collective refractive power and composed of at least three individual lenses, two collecting lenses enclosing a dispersing lens; and e. a fifth lens member constituting a meniscus of dispersive refractive power and curved towards the image, said fifth lens member possessing at least one cemented surface Curved towards the object and having a refractive index at the side of the image which is smaller than at the side of the object.
Claim 3
Dependent Claim
22 words
The objective as defined in claim 1, wherein said third lens member and said fourth lens member are cemented to one another.