Patent US5170205A successfully refreshed from Google Patents.
US5170205A
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US
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Eliminating camera-shake
Assignee: Pentax Corp
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Filing: 1990-09-25
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Granted: 1992-12-08
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Expires: 2010-09-25
Abstract
Abstract An exposure control device of a camera by which an appropriate camera-shake limit shutter speed T vf can be obtained in accordance with a focal length f of a photographing lens, and by which an arbitrary program diagram can be set on the basis of the shutter speed T vf , in which T vf is obtained by an equation: T.sub.vf =log.sub.2 f, or T.sub.vf =(log.sub.2 f)·α+β; wherein α<1, and α and β are constants which satisfy log 2 f o =(log 2 f o )·α+β for a predetermined arbitrary focal length f o .
Inventors
- 👤 Osamu Satoh
- 👤 Isamu Hirai
- 👤 Masahiro Nakata
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 14:55
CPC Classifications
G; G03; G03B; G03B17/00; G03B17/02; G03B17/12; G03B17/14; G03B7/00; G03B7/20; G03B7/24; G03B2217/00; G03B2217/005
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
147 words
A method for determining a camera-shake limit shutter speed of a camera, comprising the steps of: storing focal length data of a photographing lens representing a focal length f of the photographing lens in a binary code register, each bit of the binary code register being defined by a bit number; detecting a most significant bit of the binary code register that corresponds to a bit state of "1", a bit number of the detected most significant bit representing an integer portion of the camera-shake limit shutter speed; determining a non-integer portion of the camera-shake limit shutter speed using data of at least one bit of the binary code register which is less significant than the most significant bit; and calculating an approximate camera-shake limit shutter speed value T vf according to an equation T vf =log 2 f using the integer portion and the non-integer portion.
Claim 2
Independent Claim
147 words
A method for determining a camera-shake limit shutter speed of a camera, comprising the steps of: storing focal length data of a photographing lens representing a focal length f of the photographing lens in a binary code register, each bit of the binary code register being defined by a bit number; detecting a most significant bit of the binary code register that corresponds to a bit state of "1", a bit number of the detected most significant bit representing an integer portion of the camera-shake limit shutter speed; determining a non-integer portion of the camera-shake limit shutter speed using data of at least one bit of the binary code register which is less significant than the most significant bit; and calculating an approximate camera-shake limit shutter speed value T vf according to an equation T vf =log 2 f using the integer portion and the non-integer portion.
Claim 3
Dependent Claim
79 words
The method according to claim 1, in which the step of determining the non-integer portion of the T vf value further comprises: assigning to all bits, less significant than the most significant bit, having a bit state "1", a value determined in accordance with (1/2) n , wherein n is related to a position of a bit with respect to the most significant bit; and adding at least some of the values assigned by the step of assigning values.
Claim 4
Dependent Claim
15 words
The method according to claim 1, wherein the focal length data is expressed in millimeters.
Claim 5
Dependent Claim
153 words
An exposure control apparatus for a camera that determines an exposure in accordance with a camera-shake limit shutter speed, comprising: means for storing focal length data representing a focal length f of a photographing lens in a binary code register, each bit of said binary code register defining a bit number; processing means for detecting a most significant bit of said binary code register that corresponds to a bit state of "1", a bit number of said detected most significant bit representing an integer portion of said camera-shake limit shutter speed; means for determining a non-integer portion of said camera-shake limit shutter speed using data of at least one bit of less significance than said most significant bit in said binary code register; and means for calculating an approximate camera-shake limit shutter speed value T vf according to an equation T vf =log 2 f using said integer portion and said non-integer portion.
Claim 6
Dependent Claim
153 words
An exposure control apparatus for a camera that determines an exposure in accordance with a camera-shake limit shutter speed, comprising: means for storing focal length data representing a focal length f of a photographing lens in a binary code register, each bit of said binary code register defining a bit number; processing means for detecting a most significant bit of said binary code register that corresponds to a bit state of "1", a bit number of said detected most significant bit representing an integer portion of said camera-shake limit shutter speed; means for determining a non-integer portion of said camera-shake limit shutter speed using data of at least one bit of less significance than said most significant bit in said binary code register; and means for calculating an approximate camera-shake limit shutter speed value T vf according to an equation T vf =log 2 f using said integer portion and said non-integer portion.
Claim 7
Dependent Claim
83 words
The exposure control apparatus according to claim 4, in which said processing means determines the non-integer portion of said T vf value by assigning a value to all bits in said binary code register having a bit state "1" and having a significance less than said most significant bit, said value determined in accordance (1/2) n , wherein n is related to a position of a bit with respect to said most significant bit, and adding at least some of said assigned values.
Claim 8
Dependent Claim
16 words
The exposure control apparatus of claim 4, wherein the focal length data is expressed in millimeters.
Claim 9
Independent Claim
127 words
A method for determining a camera-shake limit shutter speed, comprising the steps of: storing a focal length f of a photographing lens associated with a camera as a binary code; detecting a most significant bit of the stored binary code that corresponds to a bit state of "1"; and calculating an approximate camera-shake limit shutter speed value T vf according to an equation T vf =log 2 f, wherein the detected most significant bit is used as an integer portion of the approximated camera-shake limit shutter speed value T vf , and a bit of the stored binary code that is less significant than the detected most significant bit is used to determine a non-integer portion of the approximated camera-shake limit shutter speed value T vf .
Claim 10
Independent Claim
127 words
A method for determining a camera-shake limit shutter speed, comprising the steps of: storing a focal length f of a photographing lens associated with a camera as a binary code; detecting a most significant bit of the stored binary code that corresponds to a bit state of "1"; and calculating an approximate camera-shake limit shutter speed value T vf according to an equation T vf =log 2 f, wherein the detected most significant bit is used as an integer portion of the approximated camera-shake limit shutter speed value T vf , and a bit of the stored binary code that is less significant than the detected most significant bit is used to determine a non-integer portion of the approximated camera-shake limit shutter speed value T vf .
Claim 11
Dependent Claim
68 words
The method of claim 7, wherein said step of using a non-integer portion comprises assigning a value to all bits in the stored binary code that has a bit state of "1" and a significance less than the most significant bit with a value according to an equation (1/2) n , where n is related to a position of a bit with respect to the most significant bit.
Claim 12
Dependent Claim
136 words
A camera-shake limit shutter speed apparatus, comprising: a memory for storing a focal length f of a photographing lens associated with a camera, said focal length being stored as a binary code; means for detecting a most significant bit of said stored binary code that corresponds to a bit state of "1"; and a processor for calculating an approximated camera-shake limit shutter speed value T vf according to an equaiton T vf =log 2 f, wherein said detected most significant bit is used as an integer portion to calculate said approximated camera-shake limit shutter speed value T vf , and a bit of said stored binary code that is less significant than said detected most significant bit is used to determine a non-integer portion to calculate said approximated camera-shake limit shutter speed value T vf .
Claim 13
Dependent Claim
136 words
A camera-shake limit shutter speed apparatus, comprising: a memory for storing a focal length f of a photographing lens associated with a camera, said focal length being stored as a binary code; means for detecting a most significant bit of said stored binary code that corresponds to a bit state of "1"; and a processor for calculating an approximated camera-shake limit shutter speed value T vf according to an equaiton T vf =log 2 f, wherein said detected most significant bit is used as an integer portion to calculate said approximated camera-shake limit shutter speed value T vf , and a bit of said stored binary code that is less significant than said detected most significant bit is used to determine a non-integer portion to calculate said approximated camera-shake limit shutter speed value T vf .
Claim 14
Dependent Claim
68 words
The apparatus of claim 9, further comprising means for determining said non-integer portion by assigning a value to all bits in said stored binary code having a bit state of "1" and having a significance less than said most significant bit with a value according to an equation (1/2) n , where n is related to a position of a bit with respect to said most significant bit.
Claim 15
Dependent Claim
14 words
The apparatus of claim 10, wherein said focal length f is expressed in millimeters.
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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) | 1995-12-08 | 1996-06-08 | 1996-12-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1999-12-08 | 2000-06-08 | 2000-12-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2003-12-08 | 2004-06-08 | 2004-12-08 | $7700.00 | Window Closed / Lapsed |