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Patent US5218439A successfully refreshed from Google Patents.
US4346974A
Expired / Lapsed
US
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Light leakage preventing device for reflex cameras
Assignee: Nidec Precision Corp
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Filing: 1981-05-18
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Granted: 1982-08-31
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Expires: 2001-05-18
Abstract
Abstract A light leakage preventing device for reflex cameras wherein a flexible light intercepting member is provided between the upper edge of a reflecting mirror and the vertical wall of a mirror box and a light intercepting member which can be brought to a light intercepting position in association with the movement of the reflecting mirror is provided between the lower edge of the reflecting mirror and the bottom wall of the mirror box so that, when the reflecting mirror is in a position in which it can conduct a light from an object to be photographed to a view finder, the light leakage from the upper edge and lower edge of the reflecting mirror to a film can be positively prevented.
Inventors
- 👤 Toshihisa Saito
- 👤 Nobuyoshi Inoue
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-10 02:28
CPC Classifications
G; G03; G03B; G03B19/00; G03B19/02; G03B19/12
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
128 words
A light leakage preventing device for reflex cameras comprising a mirror box, a reflecting mirror rotatably supported within said mirror box and movable between an up position and a down position, and a light intercepting member capable of being brought to a light intercepting position in association with the movement of said reflecting mirror in order to intercept light passing through between the lower edge of said reflecting mirror and the floor surface of said mirror box when said reflecting mirror is moved from the up position to the down position, said device further comprising a flexible light intercepting member interposed between the upper edge of said reflecting mirror and the rear wall of said mirror box and extending over the entire lateral width of said mirror box.
Claim 2
Dependent Claim
128 words
A light leakage preventing device for reflex cameras comprising a mirror box, a reflecting mirror rotatably supported within said mirror box and movable between an up position and a down position, and a light intercepting member capable of being brought to a light intercepting position in association with the movement of said reflecting mirror in order to intercept light passing through between the lower edge of said reflecting mirror and the floor surface of said mirror box when said reflecting mirror is moved from the up position to the down position, said device further comprising a flexible light intercepting member interposed between the upper edge of said reflecting mirror and the rear wall of said mirror box and extending over the entire lateral width of said mirror box.
Claim 3
Dependent Claim
115 words
A light leakage preventing device according to claim 1 wherein said mirror box has a groove extending over the entire lateral width of said mirror box on its floor surface and said light intercepting member is formed as a cover plate pivoted to said reflecting mirror and having a light intercepting part and extending over the entire lateral width of said mirror box in order that said light intercepting part is stood up in cooperation with said groove when said reflecting mirror is brought from the up position to the down position and is made to closely contact said reflecting mirror when said reflecting mirror is brought from the down position to the leaped-up position.
Claim 4
Dependent Claim
118 words
A light leakage preventing device according to claim 1 further comprising a first driving member pivoted on the side wall of said mirror box and engaged with said reflecting mirror to move said reflecting mirror up, a first locking lever pivoted on the side wall of said mirror box and capable of locking said first driving member in its cocked position, a second driving member pivoted on the side wall of said mirror box and engageable with said first driving member to bring said reflecting mirror into its lowered position when released and a second locking member pivoted on the side wall of said mirror box and capable of locking said second driving member in its cocked position.
Claim 5
Dependent Claim
220 words
A light leakage preventing device for reflex cameras comprising a mirror box, a reflecting mirror rotatably supported within said mirror box and movable between an up position and a down position, and a light intercepting member capable of being brought to a light intercepting position in association with the movement of said reflecting mirror in order to intercept light passing through between the lower edge of said reflecting mirror and the floor surface of said mirror box when said reflecting mirror is moved from the up position to the down position, said mirror box having a groove extending over the entire lateral width of said mirror box on its floor surface and said light intercepting member being formed as a cover plate rotatably supported within said groove and extending over the entire lateral width of said mirror box so as to be stood up from within said groove when said reflecting mirror is brought from the up position to the down position and to be contained within said groove when said reflecting mirror is brought from the down position to the up position, said device further comprising a flexible light intercepting member interposed between the upper edge of said reflecting mirror and the rear wall of said mirror box and extending over the entire lateral width of said mirror box.
Claim 6
Dependent Claim
220 words
A light leakage preventing device for reflex cameras comprising a mirror box, a reflecting mirror rotatably supported within said mirror box and movable between an up position and a down position, and a light intercepting member capable of being brought to a light intercepting position in association with the movement of said reflecting mirror in order to intercept light passing through between the lower edge of said reflecting mirror and the floor surface of said mirror box when said reflecting mirror is moved from the up position to the down position, said mirror box having a groove extending over the entire lateral width of said mirror box on its floor surface and said light intercepting member being formed as a cover plate rotatably supported within said groove and extending over the entire lateral width of said mirror box so as to be stood up from within said groove when said reflecting mirror is brought from the up position to the down position and to be contained within said groove when said reflecting mirror is brought from the down position to the up position, said device further comprising a flexible light intercepting member interposed between the upper edge of said reflecting mirror and the rear wall of said mirror box and extending over the entire lateral width of said mirror box.
Claim 7
Dependent Claim
197 words
A light leakage preventing device for reflex cameras comprising a mirror box, a reflecting mirror rotatably supported within said mirror box and movable between an up position and a down position, and a light intercepting member capable of being brought to a light intercepting position in association with the movement of said reflecting mirror in order to intercept light passing through between the lower edge of said reflecting mirror and the floor surface of said mirror box when said reflecting mirror is moved from the up position to the down position, said mirror box having a rib extending over the entire lateral width of said mirror box on its floor surface and said light intercepting member being formed as a cover plate pivoted to said reflecting mirror and having a light intercepting part and extending over the entire lateral width of said mirror box in order that said light intercepting part is stood up in cooperation with said rib when said reflecting mirror is brought from the up position to the down position and is made to closely contact with said reflecting mirror when said reflecting mirror is brought from the down position to the up position.
Claim 8
Dependent Claim
197 words
A light leakage preventing device for reflex cameras comprising a mirror box, a reflecting mirror rotatably supported within said mirror box and movable between an up position and a down position, and a light intercepting member capable of being brought to a light intercepting position in association with the movement of said reflecting mirror in order to intercept light passing through between the lower edge of said reflecting mirror and the floor surface of said mirror box when said reflecting mirror is moved from the up position to the down position, said mirror box having a rib extending over the entire lateral width of said mirror box on its floor surface and said light intercepting member being formed as a cover plate pivoted to said reflecting mirror and having a light intercepting part and extending over the entire lateral width of said mirror box in order that said light intercepting part is stood up in cooperation with said rib when said reflecting mirror is brought from the up position to the down position and is made to closely contact with said reflecting mirror when said reflecting mirror is brought from the down position to the up position.
Claim 9
Dependent Claim
44 words
A light leakage preventing device according to claim 5 further comprising a flexible light intercepting member interposed between the upper edge of said reflecting mirror and the rear wall of said mirror box and extending over the entire lateral width of said mirror box.
Claim 10
Dependent Claim
180 words
A light leakage preventing device for reflex cameras comprising a mirror box, a reflecting mirror rotatably supported within said mirror box and movable between an up position and a down position, and a light intercepting member capable of being brought to a light intercepting position in association with the movement of said reflecting mirror in order to intercept light passing through between the lower edge of said reflecting mirror and the floor surface of said mirror box when said reflecting mirror is moved from the up position to the down position, said light intercepting member being formed as a cover plate pivoted to said reflecting mirror and having a light intercepting part and extending over the entire lateral width of said mirror box in order that said light intercepting part is stood up in cooperation with the floor surface of said mirror box when said reflecting mirror is brought from the up position to the down position and is made to closely contact said reflecting mirror when said reflecting mirror is brought from the down position to the up position.
Claim 11
Dependent Claim
180 words
A light leakage preventing device for reflex cameras comprising a mirror box, a reflecting mirror rotatably supported within said mirror box and movable between an up position and a down position, and a light intercepting member capable of being brought to a light intercepting position in association with the movement of said reflecting mirror in order to intercept light passing through between the lower edge of said reflecting mirror and the floor surface of said mirror box when said reflecting mirror is moved from the up position to the down position, said light intercepting member being formed as a cover plate pivoted to said reflecting mirror and having a light intercepting part and extending over the entire lateral width of said mirror box in order that said light intercepting part is stood up in cooperation with the floor surface of said mirror box when said reflecting mirror is brought from the up position to the down position and is made to closely contact said reflecting mirror when said reflecting mirror is brought from the down position to the up position.
Claim 12
Dependent Claim
44 words
A light leakage preventing device according to claim 7 further comprising a flexible light intercepting member interposed between the upper edge of said reflecting mirror and the rear wall of said mirror box and extending over the entire lateral width of said mirror box.
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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) | 1985-08-30 | 1986-03-01 | 1986-08-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-08-30 | 1990-03-01 | 1990-08-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-08-30 | 1994-03-01 | 1994-08-31 | $7700.00 | Window Closed / Lapsed |