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US3904286A Expired / Lapsed US ⏱️ 0.0 years remaining

Microfilm reader

Assignee: Canon Inc
•
Filing: 1974-04-09
•
Granted: 1975-09-09
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Expires: 1994-04-09
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Abstract

Abstract A microfilm reader comprising a screen mounted on the reader and a screen mounted externally of the reader whereby the viewing of the image projected on either of the screens may be selectively performed. A knob is provided to effect automatic switching of such viewing.

Inventors

  • 👤 Kokichi Omi
  • 👤 Shunzo Inoue

Bibliographic Details

Application Number —
Jurisdiction US
Data Source google_patents
Last Synchronized 2026-10-31 10:12
CPC Classifications
G; G03; G03B; G03B21/00; G03B21/10; G03B21/11

Claims Analysis

Total Claims: 13
Claim 1
Independent Claim 119 words
In a film reader having an image projecting means and provided with a reflection screen and a reflection mirror within a casing comprising: first pivotable means for pivoting the reflection mirror provided at an upper portion of the casing; second pivotable means for opening and closing a rear wall of the casing which is facing an opening of the casing for observing the reflection screen; belt means interconnecting said first pivotable means and said second pivotable means; and operating means for driving said belt means; whereby a projected image is selectively projected, through the reflection mirror, onto said reflection screen or onto a screen provided outside the film reader through the opening at the rear wall of the casing.
Claim 2
Dependent Claim 119 words
In a film reader having an image projecting means and provided with a reflection screen and a reflection mirror within a casing comprising: first pivotable means for pivoting the reflection mirror provided at an upper portion of the casing; second pivotable means for opening and closing a rear wall of the casing which is facing an opening of the casing for observing the reflection screen; belt means interconnecting said first pivotable means and said second pivotable means; and operating means for driving said belt means; whereby a projected image is selectively projected, through the reflection mirror, onto said reflection screen or onto a screen provided outside the film reader through the opening at the rear wall of the casing.
Claim 3
Dependent Claim 17 words
A film reader according to claim 1, wherein said first and second pivotable means include pulleys respectively.
Claim 4
Dependent Claim 13 words
A film reader according to claim 2, wherein said pulleys have different diameters.
Claim 5
Dependent Claim 13 words
A film reader according to claim 1, wherein said rear wall is foldable.
Claim 6
Dependent Claim 29 words
A film reader according to claim 1, wherein said first and second pivotable means rotate in different ways with respect to each other, when said belt means is driven.
Claim 7
Dependent Claim 180 words
An image reader comprising: a reflection screen; a casing having walls for enclosing said reflection screen, an opening for permitting observation of an image projected on said screen, and an openable rear wall facing the opening; a reflection mirror pivotably mounted within said casing, said reflection mirror having first and second positions thereof; a first pulley for changing the position of said reflection mirror between said first and second positions; a second pulley for opening and closing the rear wall, said second pulley being disposed on the rear wall; belt means interconnecting said first pulley and said second pulley to rotate said pulleys; illuminating means for illuminating a film to be projected; lens means for projecting an image of the film with magnification; and operating means for driving and controlling said belt means to selectively project the image of the film onto said reflection screen through said reflection mirror placed at the first position thereof, or onto a screen provided outside of the casing through said reflection mirror placed at the second position thereof and through the opened rear wall.
Claim 8
Dependent Claim 180 words
An image reader comprising: a reflection screen; a casing having walls for enclosing said reflection screen, an opening for permitting observation of an image projected on said screen, and an openable rear wall facing the opening; a reflection mirror pivotably mounted within said casing, said reflection mirror having first and second positions thereof; a first pulley for changing the position of said reflection mirror between said first and second positions; a second pulley for opening and closing the rear wall, said second pulley being disposed on the rear wall; belt means interconnecting said first pulley and said second pulley to rotate said pulleys; illuminating means for illuminating a film to be projected; lens means for projecting an image of the film with magnification; and operating means for driving and controlling said belt means to selectively project the image of the film onto said reflection screen through said reflection mirror placed at the first position thereof, or onto a screen provided outside of the casing through said reflection mirror placed at the second position thereof and through the opened rear wall.
Claim 9
Dependent Claim 15 words
An image reader according to claim 6, wherein said opening is provided with a filter.
Claim 10
Dependent Claim 13 words
An image reader according to claim 6, wherein said rear wall is foldable.
Claim 11
Dependent Claim 28 words
An image reader according to claim 6, wherein said first and second pulleys move in different ways with respect to each other, when said belt means is driven.
Claim 12
Dependent Claim 13 words
An image reader according to claim 6, wherein said pulleys have different diameters.
Claim 13
Dependent Claim 31 words
An image reader according to claim 6, wherein the angles of rotation of said first and second pulleys are different with respect to each other, when said belt means is driven.

References Cited (Backward Citations)

US3807847A Cited

USPTO Annuity & Maintenance Windows

Annuity Stage Window Opens Payment Deadline Surcharge Period Until Estimated Fee Status
3.5 Years (Year 4) 1978-09-08 1979-03-10 1979-09-09 $2000.00 Window Closed / Lapsed
7.5 Years (Year 8) 1982-09-08 1983-03-10 1983-09-09 $3760.00 Window Closed / Lapsed
11.5 Years (Year 12) 1986-09-08 1987-03-10 1987-09-09 $7700.00 Window Closed / Lapsed

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