Patent EP0404523A2 successfully refreshed from Google Patents.
EP0404523A2
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EP
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Automatic focusing device
Assignee: Nikon Corp
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Filing: 1990-06-19
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Granted: —
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Expires: 2010-06-19
Abstract
Abstract An automatic focus device for a camera which comprises a phototaking lens for forming the image of an object on a predetermined plane, a focus detection device for detecting the amount of defocus of the image plane of the phototaking lens with respect to the predetermined plane, a lens position detecting device for detecting the position of the phototaking lens, an in-focus lens position determining device for determining an in-focus lens position to which the phototaking lens is to be focused, from said defocus amount and said lens position, a lens movement pattern memory device for storing, as lens movement pattern information, the relationship between the lens position and time for focusing the phototaking lens to a particular moving object and a lens drive controller device for controlling the lens position in such a manner that the movement of the phototaking lens as a function of time coincides with the lens movement pattern information, and compensating the position-time relationship of the phototaking lens and the lens movement pattern information, based on the in-focus lens position.
Inventors
- 👤 Yosuke Kusaka
- 👤 Toshimi Watanabe
- 👤 Ken Utagawa
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-01 16:57
CPC Classifications
G; G02; G02B; G02B7/00; G02B7/28; G02B7/36
Claims Analysis
Total Claims: 35
Claim 1
Independent Claim
169 words
An automatic focus device for a camera, comprising: a phototaking lens for forming the image of an object on a predetermined plane; focus detection means for detecting the amount of defocus of the image plane of said phototaking lens with respect to said predetermined plane; lens position detecting means for detecting the position of said phototaking lens; in-focus lens position determining means for determining an in-focus lens position to which said phototaking lens is to be focused, from said defocus amount and said lens position; lens movement pattern memory means for storing, as lens movement pattern information, the relationship between the lens position and time for focusing said phototaking lens to a particular moving object; and lens drive controller means for controlling the lens position in such a manner that the movement of said phototaking lens as a function of time coincides with the lens movement pattern information, and compensating the position-time relationship of said phototaking lens and said lens movement pattern information, based on the in-focus lens position.
Claim 2
Dependent Claim
169 words
An automatic focus device for a camera, comprising: a phototaking lens for forming the image of an object on a predetermined plane; focus detection means for detecting the amount of defocus of the image plane of said phototaking lens with respect to said predetermined plane; lens position detecting means for detecting the position of said phototaking lens; in-focus lens position determining means for determining an in-focus lens position to which said phototaking lens is to be focused, from said defocus amount and said lens position; lens movement pattern memory means for storing, as lens movement pattern information, the relationship between the lens position and time for focusing said phototaking lens to a particular moving object; and lens drive controller means for controlling the lens position in such a manner that the movement of said phototaking lens as a function of time coincides with the lens movement pattern information, and compensating the position-time relationship of said phototaking lens and said lens movement pattern information, based on the in-focus lens position.
Claim 3
Dependent Claim
102 words
An automatic focusing device according to claim 1, wherein said lens drive controller means is adapted to read said lens movement pattern information, having the initial position at the initially obtained in-focus lens position, with the lapse of time thereby effecting the control in such a manner that the actual lens position conforms thereto, and, in case a new in-focus lens position is obtained in the course of said control, to correct the lens position of said lens movement pattern information to said new in-focus lens position and to re-start the reading of said lens movement pattern information from said new position.
Claim 4
Dependent Claim
25 words
An automatic focusing device according to claim 1, further comprising: lens movement pattern setting means for setting said lens movement pattern information from the outside.
Claim 5
Dependent Claim
27 words
An automatic focusing device according to claim 1, further comprising: memory controller means having a lens movement pattern drive mode and a lens movement pattern memory mode.
Claim 6
Dependent Claim
45 words
An automatic focusing device according to claim 1, wherein said memory controller means is adapted, in said lens movement pattern memory mode, to store the relationship between the in-focus lens position and time as the lens movement pattern in the lens movement pattern memory means.
Claim 7
Dependent Claim
40 words
An automatic focusing device according to claim 1, wherein said lens movement pattern memory means is adapted to proportionally compress or expand the lens movement pattern information along the time axis, based on plural in-focus lens positions and intervals thereof.
Claim 8
Dependent Claim
48 words
An automatic focusing device according to claim 1, wherein said lens movement pattern information has plural values in time for a lens position, and said lens drive controller means is adapted to select, in the initial state, the smaller value in time of said lens movement pattern information.
Claim 9
Dependent Claim
30 words
An automatic focusing device according to claim 1, wherein said lens drive controller means comprises starter means for instructing the start of lens drive control matching said lens movement pattern.
Claim 10
Dependent Claim
207 words
An automatic focusing device for a camera, comprising: a phototaking lens for forming the image of an object on a predetermined plane; focus detecting means for detecting the amount of defocus of image plane of said phototaking lens with respect to said predetermined plane; lens position detecting means for detecting the position of said phototaking lens; in-focus lens position determining means for intermittently determining an in-focus lens position to which said phototaking lens is to be focused, from said defocus amount and said lens position; in-focus position memory means for storing plural in-focus lens positions and times generated time-sequentially; lens movement pattern memory means for storing, as the lens movement pattern information, the relationship between the lens position and time for focusing said phototaking lens to a particular moving object; lens movement pattern compensating means for compensating said lens movement pattern information and generating compensated lens movement pattern information in such a manner as to reduce the error between the lens movement pattern information stored in said lens movement pattern memory means and the in-focus lens position determined by said in-focus lens position determining means; and lens drive controller means for effecting the drive control for said phototaking lens, according to said compensated lens movement pattern information.
Claim 11
Dependent Claim
207 words
An automatic focusing device for a camera, comprising: a phototaking lens for forming the image of an object on a predetermined plane; focus detecting means for detecting the amount of defocus of image plane of said phototaking lens with respect to said predetermined plane; lens position detecting means for detecting the position of said phototaking lens; in-focus lens position determining means for intermittently determining an in-focus lens position to which said phototaking lens is to be focused, from said defocus amount and said lens position; in-focus position memory means for storing plural in-focus lens positions and times generated time-sequentially; lens movement pattern memory means for storing, as the lens movement pattern information, the relationship between the lens position and time for focusing said phototaking lens to a particular moving object; lens movement pattern compensating means for compensating said lens movement pattern information and generating compensated lens movement pattern information in such a manner as to reduce the error between the lens movement pattern information stored in said lens movement pattern memory means and the in-focus lens position determined by said in-focus lens position determining means; and lens drive controller means for effecting the drive control for said phototaking lens, according to said compensated lens movement pattern information.
Claim 12
Dependent Claim
51 words
An automatic focusing device according to claim 9, wherein said drive controller means is adapted to effect the drive control for said phototaking lens according to the compensated lens movement pattern information of preceding time, in case said in-focus lens position determining means is incapable of determining the in-focus lens position.
Claim 13
Dependent Claim
54 words
An automatic focusing device according to claim 9, wherein said lens drive controller means is adapted to effect the drive control for said phototaking lens according to the compensated lens movement pattern information of preceding time, in case the in-focus lens position determined by said in-focus lens position determining means shows a sudden change.
Claim 14
Dependent Claim
81 words
An automatic focusing device according to claim 9, wherein said lens movement pattern compensating means is adapted to generate a signal indicating the error between said compensated lens movement pattern information and said in-focus lens position, and said device further comprises drive inhibiting means for inhibiting the drive control of said phototaking lens by said lens drive controller means according to the compensated lens movement pattern information, in case said error signal is equal to or larger than a predetermined value.
Claim 15
Dependent Claim
45 words
An automatic focusing device according to claim 12, wherein said lens drive controller means is adapted to effect the drive control for said phototaking lens according to said in-focus lens position, in case said error signal is equal to or larger than a predetermined value.
Claim 16
Dependent Claim
68 words
An automatic focusing device according to claim 12, wherein said lens movement pattern compensating means is adapted to generate a compensating amount signal for the compensated lens movement pattern information signal, and said drive inhibiting means is adapted to inhibit the drive control for said phototaking lens by said lens drive controller means in case said compensation amount signal is equal to or larger than a predetermined value.
Claim 17
Dependent Claim
88 words
An automatic focusing device according to claim 9, further comprising: plural lens movement pattern memory means and selector means; wherein said lens movement pattern compensating means is adapted to generate an error signal indicating the error between the lens movement pattern information stored in each of said plural lens movement pattern memory means and the in-focus lens position determined by said in-focus lens position determining means; and said selector means is adapted to select a compensated lens movement pattern corresponding to the minimum one among said error signals.
Claim 18
Dependent Claim
46 words
An automatic focusing device according to claim 9, wherein said lens movement pattern compensating means is adapted to generate the compensated lens movement pattern information by applying proportional expansion or compression and parallel displacement in lens position and in time to the lens movement pattern information.
Claim 19
Dependent Claim
61 words
An automatic focusing device according to claim 9, wherein said lens movement pattern compensating means is adapted to generate the compensated lens movement pattern information by compensating said lens movement pattern information in such a manner as to reduce the errors with respect to the in-focus lens positions within a predetermined past period or of a predetermined number in the past.
Claim 20
Dependent Claim
147 words
An automatic focusing device for a camera, comprising: a phototaking lens for forming the image of an object on a predetermined plane; focus detecting means for detecting the amount of defocus of image plane of said phototaking lens with respect to said predetermined plane; lens position detecting means for detecting the position of said phototaking lens; in-focus lens position determining means for determining an in-focus lens position to which said phototaking lens is to be focused, from said defocus amount and said lens position; lens movement pattern memory means for determining and storing lens movement pattern information indicating a relationship between the lens position and time for focusing said phototaking lens to a particular moving object, based on plural in-focus lens positions and times generated time-sequentially; and lens drive controller means for effecting the drive control for said phototaking lens based on said lens movement pattern information.
Claim 21
Dependent Claim
147 words
An automatic focusing device for a camera, comprising: a phototaking lens for forming the image of an object on a predetermined plane; focus detecting means for detecting the amount of defocus of image plane of said phototaking lens with respect to said predetermined plane; lens position detecting means for detecting the position of said phototaking lens; in-focus lens position determining means for determining an in-focus lens position to which said phototaking lens is to be focused, from said defocus amount and said lens position; lens movement pattern memory means for determining and storing lens movement pattern information indicating a relationship between the lens position and time for focusing said phototaking lens to a particular moving object, based on plural in-focus lens positions and times generated time-sequentially; and lens drive controller means for effecting the drive control for said phototaking lens based on said lens movement pattern information.
Claim 22
Dependent Claim
88 words
An automatic focusing device according to claim 18, further comprising: plural in-focus position memory means for storing plural in-focus lens positions and times generated time-sequentially; and lens movement pattern calculating means for determining a lens movement pattern information indicating the relationship between lens position and time for focusing said phototaking lens to a particular moving object, based on the in-focus lens positions and times stored in said plural in-focus position memory means; wherein said lens movement pattern memory means is adapted to store said lens movement pattern information.
Claim 23
Dependent Claim
62 words
An automatic focusing device according to claim 19, further comprising: mode selector means for selecting either an operation mode for storing, in said in-focus position memory means, the plural in-focus lens positions and times generated time-sequentially, or an operation mode for effecting the drive control for said phototaking lens by said lens drive controller means according to the lens movement pattern information.
Claim 24
Dependent Claim
23 words
An automatic focusing device according to claim 19, further comprising memory selector means for selecting one of said plural in-focus position memory means.
Claim 25
Dependent Claim
34 words
An automatic focusing device according to claim 19, further comprising memory controller means for controlling whether or not to store, in said plural in-focus position memory means, the plural in-focus lens positions and times.
Claim 26
Dependent Claim
28 words
An automatic focusing device according to claim 22, further comprising display means for displaying the content of the in-focus position memory means selected by said memory selector means.
Claim 27
Dependent Claim
194 words
An automatic focusing device for a camera, comprising: a phototaking lens for forming the image of an object on a predetermined plane; focus detecting means for detecting the amount of defocus of image plane of said phototaking lens with respect to said predetermined plane; tracking means for generating a tracking signal by predicting the movement of the object, based on the plural past defocus amounts; movement pattern determining means for determining a function representing the movement pattern of the object, based on information relating to the object movement and on said defocus amount; estimation means for generating a predicted movement signal by predicting the object movement according to said function; deviation deciding means for discriminating whether the latest defocus amount obtained from said focus detecting means is deviated from the predicted movement signal generated by said estimation means; estimation controller means for calculating the drive amount for said phototaking lens either based on said predicted movement signal when a deviated state is identified by said deviation deciding means, or on said tracking signal when a non-deviated state is identified; and lens drive means for driving said phototaking lens according to said lens movement amount.
Claim 28
Dependent Claim
194 words
An automatic focusing device for a camera, comprising: a phototaking lens for forming the image of an object on a predetermined plane; focus detecting means for detecting the amount of defocus of image plane of said phototaking lens with respect to said predetermined plane; tracking means for generating a tracking signal by predicting the movement of the object, based on the plural past defocus amounts; movement pattern determining means for determining a function representing the movement pattern of the object, based on information relating to the object movement and on said defocus amount; estimation means for generating a predicted movement signal by predicting the object movement according to said function; deviation deciding means for discriminating whether the latest defocus amount obtained from said focus detecting means is deviated from the predicted movement signal generated by said estimation means; estimation controller means for calculating the drive amount for said phototaking lens either based on said predicted movement signal when a deviated state is identified by said deviation deciding means, or on said tracking signal when a non-deviated state is identified; and lens drive means for driving said phototaking lens according to said lens movement amount.
Claim 29
Dependent Claim
73 words
An automatic focusing device according to claim 24, wherein said estimation controller means is adapted to calculate predicted image plane moving speed at present time and at a succeeding time, based on said function, and, in case of a predetermined change in said speeds, calculates compensated lens drive amount from said lens drive amount, and said lens drive means is adapted to drive said phototaking lens according to said compensated lens drive amount.
Claim 30
Dependent Claim
73 words
An automatic focusing device according to claim 24, further comprising: object movement pattern parameter setting means for storing information relating to the movements of plural objects; wherein said movement pattern determining means is adapted to determine the movement pattern by determining said functions on the image plane moving speed based on plural information stored in said object movement pattern parameter setting means, and selecting one, best matching the target object, among said function.
Claim 31
Dependent Claim
94 words
An automatic focusing device according to claim 24, further comprising: lens information memory means for storing information relating to the phototaking lens; object movement pattern parameter setting means for storing a constant which is relating to the object movement but is independent from the focal length of the phototaking lens; and movement pattern constant calculating means for calculating, from the focal length information of said lens information memory means and the constant of said object movement pattern parameter setting means, a constant representing the movement pattern, for supply to said movement pattern determining means.
Claim 32
Dependent Claim
107 words
An automatic focusing device according to claim 26, further comprising: lens information memory means for storing information relating to the phototaking lens; movement pattern parameter input means for external entry of parameters relating to the object movement; movement pattern parameter memory means for storing the parameters thus entered; and movement pattern constant calculating means for calculating a constant relating to the object movement pattern, based on the lens information in said lens information memory means and the information of said movement pattern parameter memory means; wherein said object movement pattern parameter memory means is adapted to store the constant calculated by said movement pattern constant calculating means.
Claim 33
Dependent Claim
45 words
An automatic focusing device according to claim 26, wherein said object movement pattern parameter setting means is adapted to set a function representing the squared reciprocal of the shifting amount of the phototaking lens, as the function relating to the movement pattern of the object.
Claim 34
Dependent Claim
66 words
An automatic focusing device comprising: memory means for storing information corresponding to predetermined required lens position as a function of time in accordance with expected object movement; means for repeatedly determining a current in-focus lens position; and lens drive control means for controlling the lens position in accordance with the predetermined required lens position information when corrected in accordance with the determined current in-focus lens position.
Claim 35
Dependent Claim
66 words
An automatic focusing device comprising: memory means for storing information corresponding to predetermined required lens position as a function of time in accordance with expected object movement; means for repeatedly determining a current in-focus lens position; and lens drive control means for controlling the lens position in accordance with the predetermined required lens position information when corrected in accordance with the determined current in-focus lens position.
References Cited (Backward Citations)
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