Patent US5223873A successfully refreshed from Google Patents.
US5223873A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Magnification change-over device for a camera
Assignee: Canon Inc
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Filing: 1992-02-05
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Granted: 1993-06-29
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Expires: 2012-02-05
Abstract
Abstract A magnification change-over device is arranged to be highly suitable for a camera of the kind having a photo-taking lens and a viewfinder arranged independently of each other. The device includes the photo-taking lens having an image magnification which is variable; the viewfinder which is arranged to have an image magnification thereof also variable; an operating device for varying the image magnification of the viewfinder; a detecting device for detecting the magnifying state of the viewfinder; and a driving apparatus for driving the photo-taking lens according to a detection signal of the detecting device when a shutter release operation is performed. After a magnification setting operation is performed on the viewfinder, the change-over device changes the magnification of the photo-taking lens according to the magnification of the viewfinder when a photographing operation is actually performed.
Inventors
- 👤 Takayuki Tsuboi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 18:46
CPC Classifications
G; G03; G03B; G03B19/00; G03B19/02; G03B19/04; G03B19/07; G02; G02B; G02B13/00; G02B13/08; G02B13/12; G02B15/00; G02B15/02; G02B15/04; G03B13/00; G03B13/02; G03B13/10; G03B13/12; G03B13/18; G03B13/20
Claims Analysis
Total Claims: 41
Claim 1
Independent Claim
106 words
A camera having a magnification change-over device, comprising: a) A photo-taking optical system having a magnification which is variable; b) a viewfinder optical system having a magnification which is variable; c) operating means for varying the magnification of said viewfinder optical system; d) detecting means for detecting the magnifying state of said viewfinder optical system; and e) driving means for driving said photo-taking optical system in response to the output of said detecting means to change the magnification of said photo-taking optical system, wherein said driving means includes start means for starting the driving operation of said driving means in response to a shutter release operation.
Claim 2
Dependent Claim
106 words
A camera having a magnification change-over device, comprising: a) A photo-taking optical system having a magnification which is variable; b) a viewfinder optical system having a magnification which is variable; c) operating means for varying the magnification of said viewfinder optical system; d) detecting means for detecting the magnifying state of said viewfinder optical system; and e) driving means for driving said photo-taking optical system in response to the output of said detecting means to change the magnification of said photo-taking optical system, wherein said driving means includes start means for starting the driving operation of said driving means in response to a shutter release operation.
Claim 3
Dependent Claim
25 words
A camera according to claim 1, wherein said operating means includes a manual operating mechanism for varying the magnification of said view finder optical system.
Claim 4
Dependent Claim
20 words
A camera according to claim 1, wherein said detecting means includes a switch which is interlocked with said operating means.
Claim 5
Dependent Claim
31 words
A camera according to claim 1, wherein said driving means includes a helicoidal bar which is arranged to transmit the driving force of said driving means to said photo-taking optical system.
Claim 6
Dependent Claim
46 words
A camera according to claim 4, wherein said photo-taking optical system includes a first optical system and a second optical system, said first and second optical systems being disposed with a shutter interposed in between them and are arranged to be driven by said helicoidal bar.
Claim 7
Dependent Claim
39 words
A camera according to claim 4, wherein said photo-taking optical system includes first and second optical systems which are arranged to be driven by said helicoidal bar with a stop interposed in between said first and second optical systems.
Claim 8
Dependent Claim
21 words
A camera according to claim 5, wherein said helicoidal bar is arranged to extend passing by one side of said shutter.
Claim 9
Dependent Claim
21 words
A camera according to claim 6, wherein said helicoidal bar is arranged to extend passing by one side of said stop.
Claim 10
Dependent Claim
30 words
A camera according to claim 1, wherein said driving means includes manual operation means for causing said driving means to begin to drive by manually operating said manual operation means.
Claim 11
Dependent Claim
14 words
A camera according to claim 1, wherein said start means includes electromagnetic start means.
Claim 12
Dependent Claim
29 words
A camera according to claim 1, further comprising control means for bringing said photo-taking optical system back to an initial position thereof after completion of an exposure effecting action.
Claim 13
Dependent Claim
63 words
A camera according to claim 1, further comprising: f) focus adjustment signal forming means for forming a signal for adjustment of a focal point; and g) computing means for computing, on the basis of an output of said focus adjustment signal forming means and that of said detecting means, to obtain an extent to which said photo-taking optical system is to be shifted.
Claim 14
Dependent Claim
90 words
A camera having a magnification change-over device, comprising: (a) a finder for viewing an object to be photographed, said finder indicating a photographic magnification: (b) a photographic optical system variable in magnification; (c) response means for varying the magnification of said photographic optical system in response to the photographic magnification indicated by said finder; and (d) change-over means for changing over the photographic magnification indicated by said finder, said change-over means being provided so as to change over the photographic magnification indicated by said finder without actuating said response means.
Claim 15
Dependent Claim
90 words
A camera having a magnification change-over device, comprising: (a) a finder for viewing an object to be photographed, said finder indicating a photographic magnification: (b) a photographic optical system variable in magnification; (c) response means for varying the magnification of said photographic optical system in response to the photographic magnification indicated by said finder; and (d) change-over means for changing over the photographic magnification indicated by said finder, said change-over means being provided so as to change over the photographic magnification indicated by said finder without actuating said response means.
Claim 16
Dependent Claim
28 words
A camera according to claim 13, wherein said response means includes actuation means for starting the operation of said response means by action of shutter release operation means.
Claim 17
Dependent Claim
22 words
A camera according to claim 13, and further comprising operation means for starting the operation of the response means by manual operation.
Claim 18
Dependent Claim
25 words
A camera according to claim 13, wherein said response means includes judging means for judging the status of the photographic magnification indicated by said finder.
Claim 19
Dependent Claim
26 words
A camera according to claim 13, and further comprising restoration means for restoring the photographic optical system to an initial state after completion of an exposure.
Claim 20
Dependent Claim
92 words
A camera having a magnification change-over device, comprising: (a) a photographic optical system variable in photographic range; (b) a finder for viewing an object to be photographed, said finder indicating a photographic range of the photographic optical system; (c) response means for varying the photographic range of the photographic optical system in response to the photographic range indicated by the finder; and (d) change-over means for changing over the photographic range indicated by the finder, said change-over means changing over the photographic range indicated by the finder without actuating the response means.
Claim 21
Dependent Claim
92 words
A camera having a magnification change-over device, comprising: (a) a photographic optical system variable in photographic range; (b) a finder for viewing an object to be photographed, said finder indicating a photographic range of the photographic optical system; (c) response means for varying the photographic range of the photographic optical system in response to the photographic range indicated by the finder; and (d) change-over means for changing over the photographic range indicated by the finder, said change-over means changing over the photographic range indicated by the finder without actuating the response means.
Claim 22
Dependent Claim
28 words
A camera according to claim 18, wherein said response means includes actuation means for starting the operation of said response means by action of shutter release operation means.
Claim 23
Dependent Claim
22 words
A camera according to claim 18, and further comprising operation means for starting the operation of the response means by manual operation.
Claim 24
Dependent Claim
25 words
A camera according to claim 18, wherein said response means includes judging means for judging the status of the photographic range indicated by the finder.
Claim 25
Dependent Claim
26 words
A camera according to claim 18, and further comprising restoration means for restoring the photographic optical system to an initial state after completion of an exposure.
Claim 26
Dependent Claim
54 words
A camera having a magnification change-over device, comprising: (a) a finder for viewing an object to be photographed, said finder indicating a photographic magnification, which magnification is continuously variable; (b) a photographic optical device variable in magnification in response to the photographic magnification indicated by the finder, said optical device varying the magnification discontinuously.
Claim 27
Dependent Claim
54 words
A camera having a magnification change-over device, comprising: (a) a finder for viewing an object to be photographed, said finder indicating a photographic magnification, which magnification is continuously variable; (b) a photographic optical device variable in magnification in response to the photographic magnification indicated by the finder, said optical device varying the magnification discontinuously.
Claim 28
Dependent Claim
25 words
A device according to claim 23, wherein said photographic optical device includes means for providing a magnification closest to a magnification indicated by the finder.
Claim 29
Dependent Claim
30 words
A camera according to claim 23, wherein said photographic optical device includes means for focal adjustment utilizing a photographic range where the photographic optical device does not vary the magnification.
Claim 30
Dependent Claim
32 words
A camera according to claim 25, wherein said photographic optical device further includes operation means for continuously performing the variation of the magnification of the photographic optical device and the focal adjustment.
Claim 31
Dependent Claim
69 words
A camera according to claim 26, wherein said photographic optical device further includes: (a) judgment means for judging the status of the magnification indicated by the finder; (b) focal adjustment information forming means for forming focal adjustment information; and (c) computing means for computing an amount of adjustment of the photographic optical device on the basis of outputs of the judgment means and the focal adjustment information forming means.
Claim 32
Dependent Claim
26 words
A camera according to claim 27, wherein said photographic optical device further includes means for restoring to an initial position after completion of an exposure operation.
Claim 33
Dependent Claim
15 words
A camera according to claim 26, wherein said operation means includes a common drive bar.
Claim 34
Dependent Claim
75 words
A camera having a magnification change-over device, comprising: (a) a finder for viewing an object to be photographed, said finder indicating a photographic magnification; (b) a photographic optical system variable in magnification; (c) first means for changing over the photographic magnification indicated by the finder; (d) second means for changing over the photographic magnification at the photographic optical system; and (e) control means for driving said first means first and then driving said second means.
Claim 35
Dependent Claim
75 words
A camera having a magnification change-over device, comprising: (a) a finder for viewing an object to be photographed, said finder indicating a photographic magnification; (b) a photographic optical system variable in magnification; (c) first means for changing over the photographic magnification indicated by the finder; (d) second means for changing over the photographic magnification at the photographic optical system; and (e) control means for driving said first means first and then driving said second means.
Claim 36
Dependent Claim
28 words
A camera according to claim 30, wherein said control means includes actuation means for starting the operation of said second means by action of shutter release operation means.
Claim 37
Dependent Claim
20 words
A camera according to claim 30, and further comprising operation means for manually starting the operation of said second means.
Claim 38
Dependent Claim
25 words
A camera according to claim 30, wherein said second means includes judging means for judging the status of the photographic magnification indicated by said finder.
Claim 39
Dependent Claim
26 words
A camera according to claim 30, and further comprising restoration means for restoring the photographic optical system to an initial state after completion of an exposure.
Claim 40
Dependent Claim
69 words
A camera having a magnification change-over device, comprising: (a) a finder for viewing an object to be photographed, said finder indicating a photographic magnification; and (b) a photographic optical device variable in magnification in response to the photographic magnification indicated by the finder, said photographic optical device digitally converting the photographic magnification indicated by the finder and varying in its magnification discontinuously in response to the digitally converted value.
Claim 41
Dependent Claim
69 words
A camera having a magnification change-over device, comprising: (a) a finder for viewing an object to be photographed, said finder indicating a photographic magnification; and (b) a photographic optical device variable in magnification in response to the photographic magnification indicated by the finder, said photographic optical device digitally converting the photographic magnification indicated by the finder and varying in its magnification discontinuously in response to the digitally converted value.
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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) | 1996-06-28 | 1996-12-28 | 1997-06-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2000-06-28 | 2000-12-28 | 2001-06-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2004-06-28 | 2004-12-28 | 2005-06-29 | $7700.00 | Window Closed / Lapsed |