The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Oct. 02, 2012
Filed:
Oct. 29, 2010
Tomohiko Ishibashi, Utsunomiya, JP;
Satoshi Maetaki, Utsunomiya, JP;
Tomohiko Ishibashi, Utsunomiya, JP;
Satoshi Maetaki, Utsunomiya, JP;
Canon Kabushiki Kaisha, , JP;
Abstract
A compound lens comprises three or more optical elements, including first, second, and third optical components, that are cemented together. The material of the second optical element is an organic composite material. The first optical element is cemented to one surface of the second optical element. The third optical element is disposed remotest from the first optical element in an optical axis. The diameters of effective areas of the first optical element on the cemented surface between the first and the second optical elements, and of the second optical element, and the distance ti(φ) between optically effective surfaces of the i-th optical element (i=1, 2, 3) along the optical axis at diameter φ are appropriately designed. The second optical element has such a shape that the decrease in the distance between its optically effective surfaces is small in a region outside the effective surface area.