US5225927A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Real image type finder having cemented lens with at least one resin lens element
Assignee: Pentax Corp
•
Filing: 1990-04-27
•
Granted: 1993-07-06
•
Expires: 2010-04-27
Abstract
Abstract A real image type view finder comprising at least one cemented lenses. Of the lens components constituting the cemented lens, a lens component is made of resin. The lens component may be made of material of high transmittance to ultraviolet rays.
Inventors
- 👤 Katsuhiko Nozaki
- 👤 Tetsuya Abe
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 22:14
CPC Classifications
G; G02; G02B; G02B3/00; G02B15/00; G02B15/14; G02B15/144; G02B15/1441; G02B15/16; G02B15/163; G02B15/167; G02B15/173; G02B23/00; G02B23/14; G02B7/00; G02B7/02; G02B7/022; G02B7/025; G03; G03B; G03B13/00; G03B13/02; G03B13/06; G03B13/10; G03B13/12; G03B15/00; G03B15/02; G03B15/03; G03B15/05; G02B23/145; G03B2215/00; G03B2215/05; G03B2215/0503; G03B2215/0507; G03B2215/051
Claims Analysis
Total Claims: 22
Claim 1
Independent Claim
53 words
An optical system comprising: at least one cemented lens formed of plural lens elements, at least one of said lens elements being made of resin, and wherein a movable lens group for zooming and for compensation for one of focusing offset and displacement is formed solely by said at least one cemented lens.
Claim 2
Dependent Claim
53 words
An optical system comprising: at least one cemented lens formed of plural lens elements, at least one of said lens elements being made of resin, and wherein a movable lens group for zooming and for compensation for one of focusing offset and displacement is formed solely by said at least one cemented lens.
Claim 3
Dependent Claim
50 words
A real image type finder comprising at least one cemented lens formed of plural lens elements, with at least one of said plural lens elements being made of resin, and in which at least one of said plural lens elements is made of material of high transmittance to ultraviolet rays.
Claim 4
Dependent Claim
50 words
A real image type finder comprising at least one cemented lens formed of plural lens elements, with at least one of said plural lens elements being made of resin, and in which at least one of said plural lens elements is made of material of high transmittance to ultraviolet rays.
Claim 5
Dependent Claim
31 words
A real image type finder according to claim 2, in which at least one of said plural lens elements includes a means for receiving adhesive squeezed out of said cemented lens.
Claim 6
Dependent Claim
34 words
A real image type finder according to claim 2, in which at least one of said plural lens elements includes a positioning structure means for aligning the optical axes of said plural lens elements.
Claim 7
Dependent Claim
53 words
A real image type finder according to claim 2 in which at least one of said plural lens elements includes a fixing structure means which cooperates with a clamping means for clamping said cemented lens from both sides of said cemented lens while holding said lens elements with their optical axes in alignment.
Claim 8
Dependent Claim
22 words
A real image type finder according to claim 2, wherein said at least one cemented lens comprises at least one aspherical surface.
Claim 9
Dependent Claim
36 words
A real image type finder according to claim 6, wherein a movable lens group for zooming and for compensation for one of focusing offset and displacement is formed solely by said at least one cemented lens.
Claim 10
Dependent Claim
36 words
A real image type finder according to claim 2, wherein a movable lens group for zooming and for compensation for one of focusing offset and displacement is formed solely by said at least one cemented lens.
Claim 11
Dependent Claim
21 words
A real image finder according to claim 2, further comprising means for preventing UV light from passing through said cemented lens.
Claim 12
Dependent Claim
51 words
A real image finder according to claim 9, wherein said means comprises a lens element having a UV-blocking substance and disposed on a side of said cemented lens toward an object, and a lens element having a UV-blocking substance and disposed on a side of said cemented lens toward an eyepiece.
Claim 13
Dependent Claim
24 words
A real image finder according to claim 9, wherein said cemented lens comprises first and second lens elements cemented together by a UV-cured adhesive.
Claim 14
Dependent Claim
29 words
A real image finder according to claim 2, wherein said cemented lens comprises a first lens element made of polycarbonate resin and a second lens made of PMMA resin.
Claim 15
Dependent Claim
37 words
A real image finder according to claim 2, wherein said cemented lens comprises a first lens element incorporating a UV-blocking substance and a second lens element having a higher UV light transmittance than said first lens element.
Claim 16
Dependent Claim
24 words
A real image finder according to claim 13, wherein said cemented lens comprises first and second lens elements cemented together by a UV-cured adhesive.
Claim 17
Dependent Claim
24 words
A real image finder according to claim 2, wherein said cemented lens comprises first and second lens elements cemented together by a UV-cured adhesive.
Claim 18
Dependent Claim
52 words
A real image type finder comprising at least one cemented lens formed of plural lens elements, with at least one of said plural lens elements being made of resin, and in which at least one of said plural lens elements includes a means for receiving adhesive squeezed out of said cemented lens.
Claim 19
Dependent Claim
52 words
A real image type finder comprising at least one cemented lens formed of plural lens elements, with at least one of said plural lens elements being made of resin, and in which at least one of said plural lens elements includes a means for receiving adhesive squeezed out of said cemented lens.
Claim 20
Dependent Claim
54 words
A real image type finder comprising at least one cemented lens formed of plural lens elements, with at least one of said plural lens elements being made of resin, in which at least one of said plural lens elements includes a positioning structure means for aligning the optical axes of said plural lens elements.
Claim 21
Dependent Claim
54 words
A real image type finder comprising at least one cemented lens formed of plural lens elements, with at least one of said plural lens elements being made of resin, in which at least one of said plural lens elements includes a positioning structure means for aligning the optical axes of said plural lens elements.
Claim 22
Dependent Claim
49 words
A real image type finder according to claim 17, in which said positioning structure means comprises a fixing structure means which cooperates with a clamping means for clamping said cemented lens from both sides of said cemented lens while holding said lens elements with their optical axes in alignment.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1996-07-05 | 1997-01-04 | 1997-07-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2000-07-05 | 2001-01-04 | 2001-07-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2004-07-05 | 2005-01-04 | 2005-07-06 | $7700.00 | Window Closed / Lapsed |