Invalidity dossier
US 10996448
Imaging optical system, projection display device, and imaging apparatus having a catoptric system and a dioptric system
Current assignee: Fujifilm Corp
Added 9/23/2026, 7:41:58 PM
Active provider: DeepSeek · deepseek-flash
Patent summary
Title, assignee, inventors, filing/issue dates, abstract, and a plain-language overview of the claims.
Patent Overview — US10996448B2
Title: Imaging optical system, projection display device, and imaging apparatus having a catoptric system and a dioptric system
Patent number: US10996448B2 | Application: US16/511,007 | Publication: US20200033570A1 (2020-01-30)
Inventor: Masaru Amano | Assignee: Fujifilm Corp (original and current)
Key dates: Priority date 2018-07-26; filing date 2019-07-15; granted/publication date 2021-05-04; anticipated expiration 2039-07-15. Status listed as Active.
Purpose (per the supplied text): The disclosure addresses imaging optical systems in which a dioptric system forms an intermediate image at a position conjugate to the reduction-side imaging surface and a catoptric system re-forms that intermediate image on the magnification-side imaging surface. The stated object is "to provide an imaging optical system having a small size, a wide angle, and a high optical performance in which various aberrations are satisfactorily corrected," plus a projection display device and an imaging apparatus comprising it. Background discussion identifies size-reduction difficulties in JP2008-250296A (dioptric system plus one aspheric reflective surface) and JP2017-040849A (three aspheric reflective surfaces, but a large magnification-side reflective surface).
Plain-language scope: As excerpted, the system consists, in order from a magnification side, of a catoptric system and a dioptric system including multiple lenses. The dioptric system forms a first intermediate image between itself and the catoptric system, on the optical path and at a position conjugate to the reduction-side imaging surface; the catoptric system re-forms that first intermediate image on the magnification-side imaging surface. Classifications span G02B (optical elements/systems, catadioptric systems), G03B21 (projectors), and H04N23 (camera modules).
Source: https://patents.google.com/patent/[US10996448](/patent/US10996448)/en
What the excerpt does not establish: It does not provide the full claim set or any claim limitations, the complete description, drawing contents, or specific numerical embodiments. It does not establish the full metes and bounds of the invention, whether all originally filed claims survived prosecution, or the accuracy of the listed legal status, assignees, or dates (Google Patents itself notes these are assumptions, not legal conclusions). No litigation, ownership-transfer, validity, or prior-art conclusions are drawn here.
Generated 10/1/2026, 9:41:53 PM
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Litigation summary
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PTAB challenges
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Assignment history
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Prior art
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Obviousness
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Extensions
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Derivative works
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