US5576779A
Expired / Lapsed
US
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Camera system
Assignee: Canon Inc
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Filing: 1994-10-11
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Granted: 1996-11-19
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Expires: 2014-10-11
Abstract
Abstract A camera system comprising a photographic lens having a plurality of lens units movable along a photographic optical axis when zooming, and a finder optic having a plurality of lens units movable along a finder optical axis when zooming, wherein the amounts of zooming movement of at least one of the lens units of the photographic lens and at least one of the lens units of the finder optic are the same.
Inventors
- 👤 Keiji Ikemori
- 👤 Yoshinori Itoh
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 01:52
CPC Classifications
G; G02; G02B; G02B15/00; G02B15/14; G02B15/16; G02B15/177; G02B15/143; G02B15/1435; G02B15/143503; G02B7/00; G02B7/02; G02B7/04; G02B7/10; G03; G03B; G03B13/00; G03B13/02; G03B13/10; G03B13/12; G02B23/00; G02B23/14; G02B23/145
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
307 words
A camera system comprising: photographic lens means for transmitting light used in a photographing operation, having a plurality of lens units, wherein more than one of said lens units moves along a photographic optical axis during zooming; finder optical means for transmitting light to be viewed by a user, having a plurality of lens units, wherein more than one of said lens units moves along a finder optical axis during zooming; means for connecting at least one of said lens units of said photographic lens means and one of said lens units of said finder optical means so that said at least one of the lens units of said photographic lens means and said at least one of the lens units of said finder optical means are displaced by the same amount during zooming, wherein said photographic lens means has, from front to rear, at least a first lens unit having a negative refractive power and a second lens unit having a positive refractive power, and wherein said finder optical means has, from front to rear, at least a first finder lens unit having a negative refractive power and a second finder lens unit having a positive refractive power; means for causing the amount of displacement during zooming of said first lens unit and said first finder lens unit to be the same, wherein said first lens unit, when focusing, moves along an optical axis and said first finder lens unit has a movable lens arranged during focusing to move in unison with said first lens unit, wherein the focal lengths of said first lens unit and said movable lens denoted by F1 and f11, respectively, satisfy the following condition: 0.8<|f11/F1|<1.2 ; and means for causing the amount of displacement during zooming of said second lens unit and said second finder lens unit to be the same.
Claim 2
Dependent Claim
307 words
A camera system comprising: photographic lens means for transmitting light used in a photographing operation, having a plurality of lens units, wherein more than one of said lens units moves along a photographic optical axis during zooming; finder optical means for transmitting light to be viewed by a user, having a plurality of lens units, wherein more than one of said lens units moves along a finder optical axis during zooming; means for connecting at least one of said lens units of said photographic lens means and one of said lens units of said finder optical means so that said at least one of the lens units of said photographic lens means and said at least one of the lens units of said finder optical means are displaced by the same amount during zooming, wherein said photographic lens means has, from front to rear, at least a first lens unit having a negative refractive power and a second lens unit having a positive refractive power, and wherein said finder optical means has, from front to rear, at least a first finder lens unit having a negative refractive power and a second finder lens unit having a positive refractive power; means for causing the amount of displacement during zooming of said first lens unit and said first finder lens unit to be the same, wherein said first lens unit, when focusing, moves along an optical axis and said first finder lens unit has a movable lens arranged during focusing to move in unison with said first lens unit, wherein the focal lengths of said first lens unit and said movable lens denoted by F1 and f11, respectively, satisfy the following condition: 0.8<|f11/F1|<1.2 ; and means for causing the amount of displacement during zooming of said second lens unit and said second finder lens unit to be the same.
Claim 3
Dependent Claim
48 words
A system according to claim 1, wherein said connecting means comprises means for moving in unison the lens units of said photographic lens means and the lens units of said finder optical means which are the same number of lens units from the object side of said system.
Claim 4
Dependent Claim
46 words
A system according to claim 1, said system satisfying the following conditions: |1/f.sub.1 |>|1/F.sub.1 |1/f.sub.2 >1/F.sub.2 where F1 and F2 are focal lengths of said first and second lens units respectively and f1 and f2 are focal lengths of said first and second finder lens units.
Claim 5
Dependent Claim
108 words
A system according to claim 1, wherein said photographic lens means has, from front to rear, at least a first lens unit having a negative refractive power and a second lens unit having a positive refractive power, wherein said finder optical means has, from front to rear, at least a first finder lens unit having a positive refractive power to form a primary image and a second finder lens unit having a positive refractive power to form a secondary image, and wherein said system further comprises means for causing the displacement during zooming of said first lens unit and said first finder lens unit to be the same.
Claim 6
Dependent Claim
30 words
A system according to claim 4, wherein said second lens unit and said second finder lens unit are moved by different loci of movement from each other to effect focusing.
Claim 7
Dependent Claim
48 words
A system according to claim 5, wherein said photographic lens means has a third lens unit having a negative refractive power and arranged on the image side of said second lens unit to move when zooming, and wherein said finder optical means further has a fixed eyepiece lens.
Claim 8
Dependent Claim
295 words
A camera system comprising: photographic lens means for transmitting light used in a photographing operation having a plurality of lens units, wherein more than one of said lens units moves along a photographic optical axis during zooming; finder optical means for transmitting light to be viewed by a user, having a plurality of lens units, wherein more than one of said lens units moves along a finder optical axis during zooming; and means for connecting at least one of said lens units of said photographic lens means and one of said lens units of said finder optical means so that said at least one of the lens units of said photographic lens means and said at least one of the lens units of said finder optical means are displaced by the same amount during zooming, wherein said photographic lens means has, from front to rear, at least a first lens unit having a negative refractive power and a second lens unit having a positive refractive power, and wherein said finder optical means has, from front to rear, at least a first finder lens unit having a positive refractive power to form a primary image and a second finder lens unit having a positive refractive power to form a secondary image, and wherein said system further comprises means for causing the displacement during zooming of said first lens unit and said first finder lens unit to be the same, wherein said system satisfies the conditions: |1/f.sub.1 |>|1/F.sub.1 |1/f.sub.2 >1/F.sub.2 where F 1 and F 2 are focal lengths of said first lens unit and said second lens unit of said photographic lens means, respectively, and f 1 and f 2 are focal lengths of said first finder lens unit and said second finder lens unit, respectively.
Claim 9
Dependent Claim
295 words
A camera system comprising: photographic lens means for transmitting light used in a photographing operation having a plurality of lens units, wherein more than one of said lens units moves along a photographic optical axis during zooming; finder optical means for transmitting light to be viewed by a user, having a plurality of lens units, wherein more than one of said lens units moves along a finder optical axis during zooming; and means for connecting at least one of said lens units of said photographic lens means and one of said lens units of said finder optical means so that said at least one of the lens units of said photographic lens means and said at least one of the lens units of said finder optical means are displaced by the same amount during zooming, wherein said photographic lens means has, from front to rear, at least a first lens unit having a negative refractive power and a second lens unit having a positive refractive power, and wherein said finder optical means has, from front to rear, at least a first finder lens unit having a positive refractive power to form a primary image and a second finder lens unit having a positive refractive power to form a secondary image, and wherein said system further comprises means for causing the displacement during zooming of said first lens unit and said first finder lens unit to be the same, wherein said system satisfies the conditions: |1/f.sub.1 |>|1/F.sub.1 |1/f.sub.2 >1/F.sub.2 where F 1 and F 2 are focal lengths of said first lens unit and said second lens unit of said photographic lens means, respectively, and f 1 and f 2 are focal lengths of said first finder lens unit and said second finder lens unit, respectively.
Claim 10
Dependent Claim
198 words
A camera system comprising: photographic lens means for transmitting light used in a photographing operation comprising a first lens unit and a second lens unit, wherein said first and second lens units move along a photographic optical axis during zooming; finder optical means for transmitting light to be viewed by a user, including a first finder lens unit, which moves during zooming, a re-imaging lens for re-imaging an image formed by said first finder lens unit, and an eyepiece lens unit for observing the image formed by the re-imaging lens; and means for connecting said first lens unit of said photographic lens means and said first finder lens unit of said finder optical means so that said first lens unit of said photographic lens means and said first finder lens unit of said finder optical means are displaced by the same amount during zooming; said system satisfying the conditions: |1/f.sub.1 |>|1/F.sub.1 |1/f.sub.2 >1/F.sub.2 wherein F 1 and F 2 are focal lengths of said first lens unit and said second lens unit of said photographic lens means, respectively, and f 1 and f 2 are focal lengths of said first finder lens unit and said re-imaging lens, respectively.
Claim 11
Dependent Claim
198 words
A camera system comprising: photographic lens means for transmitting light used in a photographing operation comprising a first lens unit and a second lens unit, wherein said first and second lens units move along a photographic optical axis during zooming; finder optical means for transmitting light to be viewed by a user, including a first finder lens unit, which moves during zooming, a re-imaging lens for re-imaging an image formed by said first finder lens unit, and an eyepiece lens unit for observing the image formed by the re-imaging lens; and means for connecting said first lens unit of said photographic lens means and said first finder lens unit of said finder optical means so that said first lens unit of said photographic lens means and said first finder lens unit of said finder optical means are displaced by the same amount during zooming; said system satisfying the conditions: |1/f.sub.1 |>|1/F.sub.1 |1/f.sub.2 >1/F.sub.2 wherein F 1 and F 2 are focal lengths of said first lens unit and said second lens unit of said photographic lens means, respectively, and f 1 and f 2 are focal lengths of said first finder lens unit and said re-imaging lens, respectively.
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