Automatic focus control camera
First Claim
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1. An automatic focus control camera having means for varying the focus condition comprising:
- means for obtaining information necessary for automatic focus control, including means for sensing a focus condition and means for generating a data signal indicative of the necesary degree of focus adjustment required in response to the sensing means, said obtaining means requiring a time period from the sensing of the focus condition until the generation of the data signal;
means for providing a driving power for varying the focus adjustment in accordance with the data signal;
means for directing said obtaining means to operate when the driving power is not being provided and also when the driving power is being provided;
means operative when the driving power is being provided, for modifying the effect of the data signal with the degree of focus adjustment expected to be required during a predetermined application of driving power to the means for varying the focus condition; and
means for interrupting the operation of said obtaining means and said modifying means for a period of time beginning from an initiation of providing the driving power, the period of time being greater than the time required from the initiation of the focus adjustment until an attainment of a predetermined speed of a focus adjustment movement caused by the driving power.
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Abstract
In an automatic focus control camera capable of obtaining a focus control information during focus adjustment comprising focus control information obtaining means requiring a time between the sensing of the focus condition and the generation of data indicative of the necessary degree of focus adjustment, and modifying means for modifying the data with a degree of focus adjustment expected to occur with a predetermined speed during the time, there is provided means for interrupting the operation of the obtaining means and the modifying means for a period beginning from the initiation of focus adjustment.
66 Citations
26 Claims
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1. An automatic focus control camera having means for varying the focus condition comprising:
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means for obtaining information necessary for automatic focus control, including means for sensing a focus condition and means for generating a data signal indicative of the necesary degree of focus adjustment required in response to the sensing means, said obtaining means requiring a time period from the sensing of the focus condition until the generation of the data signal; means for providing a driving power for varying the focus adjustment in accordance with the data signal; means for directing said obtaining means to operate when the driving power is not being provided and also when the driving power is being provided; means operative when the driving power is being provided, for modifying the effect of the data signal with the degree of focus adjustment expected to be required during a predetermined application of driving power to the means for varying the focus condition; and means for interrupting the operation of said obtaining means and said modifying means for a period of time beginning from an initiation of providing the driving power, the period of time being greater than the time required from the initiation of the focus adjustment until an attainment of a predetermined speed of a focus adjustment movement caused by the driving power. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. An automatic focus control camera comprising:
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means for obtaining information necessary for automatic focus control, the information being indicative of the necessary degree of focus adjustment; means for providing a driving power for focus adjustment in accordance with the information; means for directing said obtaining means to operate when the driving power is not provided; means for detecting a remainder value obtainable by subtracting the actual degree of focus adjustment caused by the driving power from the degree of focus adjustment represented by the information obtained before the provision of the driving power; means for preparing a reference data; means responsive to the remainder value and the reference data for reducing a speed of focus adjustment caused by the driving power when the remainder value becomes less than the reference data; and means for changing the reference data in accordance with the information obtained before the provision of the driving power. - View Dependent Claims (10, 11)
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12. An automatic focus control camera comprising:
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means for obtaining information necessary for automatic focus control, the information relating to a level of the defocusing degree and a direction of the defocus; means for providing a driving power for focus adjustment in accordance with the information; means for preparing a first reference level and a second reference level greater than the first one, both the first and second reference levels being greater than a level of defocusing degree which is regarded as an in-focus condition; means for comparing the information with a selected one of the first and second reference levels and for reducing the driving power of said providing means when the level of the defocusing degree represented by the information is less than the level of the defocusing degree represented by the selected reference level; and means for selecting the first reference level with the driving power not reduced, and the second reference level with the driving power reduced, respectively.
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13. An automatic focus control camera having means for varying the focus condition of the camera comprising:
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means for obtaining information necessary for automatic focus control; means for providing a driving power in accordance with the information to the means for varying the focus condition; means for repeatedly directing said obtaining means to operate when the driving power is not provided and also when the driving power is provided; means for deciding whether the information of said obtaining means is reliable; means for controlling said providing means to provide the driving power in accordance with a predetermined signal in place of the information when said deciding means decides that the information is not reliable, so as to seek another position of focus adjustment at which the information of said obtaining means is reliable; means for investigating whether the driving power is provided in accordance with the information; and means reponsive to said investigating means for disabling said controlling means when the driving power is provided. - View Dependent Claims (14, 15, 16)
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17. An automatic focus control camera comprising:
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means for obtaining information necessary for automatic focus control; means for providing a driving power for focus adjustment in accordance with the information; means for repeatedly directing said obtaining means to operate; means for finding a difference between a pair of successively obtained informations; and means responsive to said finding means for causing said providing means to respond to the later one of the pair of informations when the difference is within a predetermined range and for causing said providing means to respond to the next information obtained in succession to the pair of informations when the difference is over the predetermined range. - View Dependent Claims (18, 19, 20, 21)
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22. An automatic focus control camera comprising:
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means for obtaining information necessary for automatic focus control, the information being indicative of a level of the defocusing degree; means for providing a driving power of focus adjustment in accordance with the information; means for directing said obtaining means to operate; means for preparing a first reference level representative of a first level of defocusing degree and a second reference level representative of a second level of defocusing degree greater than the first one; means for informing whether or not a teleconverter is used with the camera; means responsive to said informing means for selecting the first reference level when the teleconverter is not used, and for selecting the second reference level when the teleconverter is used; and means for comparing the information with the selected one of the first and second reference levels and for deciding that the focus adjustment is in an in-focus condition when the level of the defocusing degree represented by the information is less than the level of the defocusing degree represented by the selected reference level. - View Dependent Claims (23)
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24. A camera capable of automatically detecting the focus condition comprising:
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means for obtaining information necessary for automatic detecting of the focus condition; means for starting a camera exopsure operation; first means for controlling the operation of said obtaining means; second means for controlling the operation of said obtaining means; sequence control means for controlling said starting means and said first controlling means; and means for selecting between said first and second controlling means, whereby said obtaining means operates under the control of said sequence control means in accordance with a total camera operation sequence when said first controlling means is selected, and said obtaining means also operates without the control of said sequence control means when said second controlling means is selected. - View Dependent Claims (25)
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26. An automatic focus control camera comprising:
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means for obtaining information necessary for focus control; means for providing a driving power for automatic focus adjustment in accordance with the information; means for providing information from said obtaining means; means for switching between an automatic focus control mode in which said driving power providing means is operative and a manual focus control mode in which said driving power providing means is inoperative; means for calculating an exposure control data; a first manually operable member for a shutter release operation; a second manually operable member for setting exposure information; first means for enabling said calculating means in response to a manipulation of either of said first and second manually operable members in either of the automatic and manual focus control modes; second means for enabling said providing means in response to a manipulation of said first manually operable member with no response to that of said second manually operable member in the automatic focus control mode; and third means for enabling said information providing means in response to a manipulation of either of said first and second manually operable members in the manual focus control mode.
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Specification