JP2002267924A - Optical instrument system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make an optical instrument system exhibit sufficient optical performance on the lens side by reducing the load for processing applied to a means to control lens drive. SOLUTION: The optical instrument system includes an optical information output means to output optical information according to each sending position of the lens, a storage means to store the optical information from the optical information output means, and a deciding means which decides in the course of the acquisition of the optical information from the optical information output means whether or not the optical information in the course of the acquisition is stored into the storage means. When the deciding means decides that the optical information in the course of the acquisition is stored into the storage means, the acquisition destination of the optical information is switched from the optical information output means to the storage means (#107 to #109).

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement in an optical instrument system such as a camera system.

[0002]

2. Description of the Related Art Conventionally, in an automatic focusing apparatus for a camera, a light beam from a subject passing through different exit pupil regions of a photographing lens is combined on a pair of line sensors, and the subject image is obtained by photoelectric conversion. An automatic focus adjustment method that detects a defocus amount of a subject by calculating an image shift amount that is a relative position displacement amount of a pair of image signals by a correlation operation and drives a photographing lens based on the detected defocus amount is widely known. ing.

In many cases, as shown in FIG. 11, overlap control is performed to detect the defocus amount not only during the stop of the lens driving but also during the driving of the lens and to update the driving amount of the lens. ing. First, as the defocus amount is large, the obtained subject image itself is blurred, so that sufficient detection accuracy cannot be obtained. Second, the larger the defocus amount is, the larger the image shift amount is. Therefore, the obtained subject image appears toward the end on the line sensor and further protrudes from the line sensor. Third, in order to actually drive the photographing lens, the amount of defocus must be converted into the amount of lens drive. However, as is well known, the two amounts have a non-linear relationship. The larger the value, the more difficult it is to obtain an accurate lens drive amount. In order to solve these problems, the photographing lens is accurately driven to the in-focus position by performing overlap control.

In order to reliably perform the overlap control, it is necessary to accurately obtain the position of the photographing lens during lens driving. As described above, since the subject image is photoelectrically converted (accumulation control) at the time of focus detection, an accumulation time corresponding to the subject brightness, contrast, and the like is required. Further, in order to obtain a lens drive amount required for focusing from the obtained subject image, calculation time such as a correlation calculation, a defocus amount calculation, and a lens drive amount calculation is required. Therefore, in updating the lens drive amount during the overlap control, the idle running amount of the photographing lens during this time must be considered.

[0005] Generally, the overlap control is performed as shown in FIG.
It becomes as shown in.

First, it is assumed that the photographing lens is driven at a constant speed from the start of focus detection to the update of the lens drive amount. The lens positions at the start and end of the focus detection are acquired, and the middle point is set as the lens position at the time of focus detection. After the correlation calculation, the defocus amount calculation, and the lens driving amount calculation, the lens position is acquired again. By subtracting the difference between the two lens positions as the lens idle amount from the lens drive amount obtained by the current focus detection, the lens drive amount necessary for focusing is obtained.

[0007]

The overlap control is performed as described above. Most interchangeable lens type single-lens reflex cameras have an MPU (micro processing unit) for each of the camera body and the interchangeable lens.
And perform specific operations by performing communication via the mount. That is, the focus detection is performed by the MPU of the camera body, but the acquisition of the lens position is requested by the MPU of the camera body to communicate with the MPU of the interchangeable lens, and the actual acquisition processing is performed by the MPU of the interchangeable lens. Data transmitted from the interchangeable lens to the camera body includes not only the lens position, but also the focal length, shooting distance, subject distance, image distance, sensitivity, best focus correction value, open F value, minimum F value, exit pupil value, Image height exit pupil value, marginal light drop (vignetting)
There is optical information such as a correction value and a lens extension amount per pulse, and is used for automatic exposure, automatic light control, and automatic focus adjustment. In the case of a single focus lens, such optical information may change depending on the extension position of the taking lens. Further, in the case of a zoom lens, there is a type that further changes according to the focal length.

Note that the exit pupil value is defined as the film plane (center).
The exit pupil value at a typical image height (distance from the center of the film surface) and the peripheral light intensity drop (vignetting) correction value This is the rate of decrease in the amount of light at the image height, and such optical information is required for automatic exposure and automatic light control. The best focus correction value is optical information necessary for automatic focus adjustment, which will be described later.

More specifically, in the case of a single focus lens, the distance ring of the photographing lens is electrically divided into equal intervals of about 4 to 32, and the extension position of the photographing lens is detected, thereby responding to that. The optical information is read from the storage means (memory) and transmitted to the camera body. In the case of a zoom lens, in addition to the extension position, the focal length is detected in the same manner, and optical information corresponding to the focal length is output.

During the overlap control, since the photographing lens is driven, there is a possibility that the feed-out position changes and the optical information changes. Further, in a zoom lens, there is a possibility that the focal length changes and the optical information changes when the photographer operates the zoom lens.

Therefore, the camera body needs to acquire and update these optical information at a certain frequency during the overlap control.

Normally, the optical information acquisition processing affects the overlap control if a delay occurs.
Generally, U is preferentially processed by interrupt processing or the like. However, since the photographing lens is driven during the overlap control, the lens MPU must also perform drive control in parallel. However,
Ultrasonic motors widely used in interchangeable lenses have complicated drive control, and the processing load on the lens MPU is large. Further, in the case of an image stabilizing lens that prevents camera shake during photographing, in addition to these processes, more complicated image stabilizing control must be performed, and a very large load is applied to the lens MPU.

As described above, during the overlap control,
An extremely large load is concentrated on the lens MPU, and at this time, if the MPU of the camera body frequently requests the lens MPU to obtain optical information, as described above, Since this process is performed with priority, the lens original process such as the lens driving process and the image stabilization control process is frequently interrupted, and sufficient performance cannot be exhibited. Specifically, if the lens driving process is frequently interrupted, the lens driving time is extended, the stopping accuracy at the lens position to be driven is deteriorated, and as a result, the time required for focusing is increased, and the focusing accuracy is increased. Is affected. In addition, if the anti-shake control process is frequently interrupted, a sufficient anti-shake effect cannot be obtained.

On the other hand, if the acquisition and update of the optical information are not performed properly, the values unique to each interchangeable lens, such as the sensitivity required for calculating the lens driving amount in the automatic focus adjustment and the correction value for the plague focus, are not correct. As a result, the time required for focusing increases and the focus accuracy decreases.

Further, the open F value, the minimum F value, the exit pupil value, the image height exit pupil value,
Since the peripheral light amount drop (vignetting) correction value is not a correct value, the shutter speed and the aperture value in the viewfinder are not displayed correctly.

(Object of the Invention) An object of the present invention is to provide an optical apparatus system capable of reducing the processing load on the means for controlling the lens drive and exhibiting sufficient optical performance on the lens side. It is assumed that.

[0017]

In order to achieve the above object, the invention according to the first aspect of the present invention is directed to a feed-out position detecting means for detecting a feed-out position of a lens and a feed-out position of the feed-out position detecting means. Optical information output means for outputting the obtained optical information, storage means for storing the optical information from the optical information output means, and optical information being obtained from the storage means during the acquisition of the optical information from the optical information output means. Determining means for determining whether the information is stored in
When the determining means determines that the optical information being obtained is stored in the storage means, the optical device system switches the source of the optical information from the optical information output means to the storage means. It is.

According to another aspect of the present invention, there is provided an image forming apparatus comprising: a feed-out position detecting means for detecting a feed-out position of a lens; and a feed-out position detecting means for detecting the feed-out position of the lens. An interchangeable lens body having optical information output means for outputting optical information; a storage means for storing optical information from the optical information output means; Determining means for determining whether information is stored in the storage means; and determining that the optical information being acquired is stored in the storage means, And an apparatus main body having control means for switching from the optical information output means to the storage means.

According to another aspect of the present invention, there is provided an image pickup apparatus comprising: a feed-out position detecting means for detecting a feed-out position of a lens; a focal-length detecting means for detecting a focal length of the lens; Optical information output means for outputting optical information corresponding to the extension position of the position detection means and the focal length of the focal length detection means,
A storage unit for storing optical information from the optical information output unit, and a determination unit for determining whether the optical information being obtained is stored in the storage unit during the acquisition of the optical information from the optical information output unit. An optical device for switching the acquisition destination of the optical information from the optical information output unit to the storage unit when the determination unit determines that the optical information being acquired is stored in the storage unit. System.

In order to achieve the above object, the invention according to a fourth aspect of the present invention comprises a feed-out position detecting means for detecting a feed-out position of a lens, a focal-length detecting means for detecting a focal length of the lens, and the feed-out means. An interchangeable lens body having optical information output means for outputting optical information corresponding to the extension position of the position detection means and the focal length of the focal length detection means, and the optical information from the optical information output means. A storage unit for storing, a determination unit for determining whether the optical information being obtained is stored in the storage unit during the acquisition of the optical information from the optical information output unit, and an optical device being obtained by the determination unit. When it is determined that the information is stored in the storage means, the control for switching the source of the optical information from the optical information output means to the storage means is performed. By a device body having means it is an constituted optics system.

In the first to fourth aspects, when the optical information being acquired is stored in the storage means, the acquisition of the optical information from the optical information output means is interrupted, and the optical information is transmitted from the storage means. Thus, the processing load on the means for controlling the lens drive (controlling the optical information output means) is reduced.

In order to achieve the above object, according to the ninth aspect of the present invention, there is provided a feed-out position detecting means for detecting a feed-out position of a lens, and a first storing means for storing optical information corresponding to each of the feed-out positions of the lens. Storage means;
Second storage means, and prior to lens drive control, acquiring all optical information corresponding to each of the extending positions of the lens from the first storage means, and storing all the optical information in the second storage means Optical information acquisition means to be stored in the
At the time of the lens drive control, a control unit that acquires optical information corresponding to each of the extension positions of the lens from the optical information acquisition unit, and calculates at least information used for the lens drive control according to the change in the extension position of the lens. Optical system.

In order to achieve the above object, according to a tenth aspect of the present invention, there is provided a feed-out position detecting means for detecting a feed-out position of a lens, and optical information corresponding to each of the feed-out positions of the lens. A lens body having a first storage means, a second storage means, and prior to lens drive control, acquiring all optical information corresponding to each of the lens extension positions from the first storage means, Optical information obtaining means for storing the optical information in the second storage means, and at the time of the lens drive control, obtaining from the optical information obtaining means optical information corresponding to each of the extending positions of the lens, A device main body having control means for calculating at least information used for the lens drive control in accordance with a change in the dispensing position. It is an optical device system.

According to another aspect of the present invention, there is provided an image forming apparatus, comprising: an extension position detection unit for detecting an extension position of a lens; a focal length detection unit for detecting a focal length of the lens; A first storage unit for storing optical information corresponding to each of the extension position and the focal length of the lens, a second storage unit, and a lens extension position and a first position before the lens drive control. An optical information acquisition unit that acquires all optical information corresponding to each of the focal lengths, and stores all the optical information in the second storage unit. Optical information corresponding to each of the distances is acquired from the optical information acquiring means, and the lens driving control is performed in accordance with a change in the extending position of the lens. It is an optical device system and a control means for at least calculating information used for.

In order to achieve the above object, the invention according to a twelfth aspect of the present invention is directed to an extended position detecting means for detecting an extended position of a lens, a focal length detecting means for detecting a focal length of the lens, and the lens. A lens main body having first storage means for storing optical information corresponding to the extension position and the focal length of the lens, a second storage means, and the lens storage means for storing the lens information before the lens drive control. Optical information acquiring means for acquiring all the optical information corresponding to the dispensing position and the focal length, and storing all the optical information in the second storage means; and Optical information corresponding to each of the extending position and the focal length is acquired from the optical information acquiring unit, and the extending position of the lens is obtained. By the apparatus main body having a control means for at least calculating information used for the lens drive control in accordance with changes in which the configured optics system.

In the ninth to twelfth aspects of the invention, prior to the lens drive control, the optical information stored in the first storage means is collectively acquired and stored in the second storage means. At the time of lens drive control, means for performing lens drive control by calculating at least information used for the lens drive control associated with a change in the let-out position of the lens from the optical information from the second storage means (the optical information (Which controls the output means).

[0027]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described in detail based on embodiments.

(First Embodiment) FIG. 1 is a block diagram showing a configuration of an interchangeable lens type single-lens reflex camera which is an example of an optical apparatus according to a first embodiment of the present invention.

In FIG. 1, reference numeral 1 denotes a lens MPU (micro-processing unit) for performing all calculations and controls relating to the photographing lens, 2 denotes a lens driving unit for driving the photographing lens, 3 denotes a lens position detecting unit, and 4 denotes a lens position detecting unit. The extension position detection unit 5 is an optical information table unique to each interchangeable lens, such as the sensitivity described below, the extension amount of the lens per pulse, and the best focus correction value.

The photographing lens (1) in this embodiment
Is a fixed focal length lens having a fixed focal length. Further, an actual photographing lens requires an aperture driving unit for driving the aperture, but this is not related to the present embodiment, and a description thereof will be omitted.

The taking lens is connected to the camera body via a mount indicated by a dotted line in the center of FIG. 6 is a camera MPU that performs all calculations and controls related to the camera body
(Micro-processing unit), which is connected to the lens MPU1 via the signal line of the mount,
It is possible to obtain the lens position, drive the lens, and obtain unique optical information for each interchangeable lens for the PU1. Reference numeral 7 denotes a defocus amount detection unit, 8 denotes a shutter drive unit, 9 denotes a film feed unit, and 10 denotes a dial unit for performing various settings (shutter speed, aperture value, shooting mode, etc.) of the camera. Reference numeral 11 denotes an optical information table on the camera side, which can store the obtained optical information. SW1 is a switch which is turned on by the first stroke operation (half press) of the release button, SW
A switch 2 is turned on by a second stroke operation (full press) of the release button.

In the above configuration, when the switch SW1 is turned on, automatic focus adjustment is performed, and the switch SW1 is turned on.
When the switch 2 is turned on, a release operation is performed. Various shooting modes can be set by operating the dial unit 10. Here, automatic focus adjustment after the switch SW1 is turned on will be described with reference to the flowchart of FIG.

When switch SW1 is turned on, step #
From 101, automatic focusing is started. First, step # 10
In 2, the lens position is obtained from the lens position detection unit 3. This is from camera MPU6 to lens MPU
This is done by communicating to the.

The defocus amount (difference between the image forming position of the photographing lens and the image plane position of the photographing lens for performing the photographing operation) required for the automatic focusing is determined by two different areas sandwiching the optical axis of the photographing lens. It is calculated from the image shift amount (prediction amount) between two images formed from the passing subject light flux.
Specifically, the luminous flux of these two images passes through a main mirror which is a half mirror, is reflected by a sub-mirror located behind the half mirror, and is guided to a defocus amount detection unit 7 by a focus detection optical system (not shown). The defocus amount detection unit 7 has a photoelectric conversion element, and the camera MPU 6 reads out the signals of these two images in step # 103. Subsequently, in step # 104, the lens position is obtained.

In the following step # 105, the photographing distance is obtained, and based on the photographing distance, the next step # 105 is performed.
At 106, the optical information table (referred to as a camera optical information table in the flow) 11 is searched to determine whether the optical information obtained this time is stored in the camera body. As a result of the search, in the next step # 107, it is determined whether or not acquisition of optical information from the photographing lens can be omitted. If it can be omitted, the process proceeds to step # 108. Degree, best focus correction value, 1
The optical information such as the defocus amount per pulse is obtained.

The optical information table 11 is as shown in FIG. 3, and stores the sensitivity according to the photographing distance, the best focus correction value, the defocus amount per pulse, and the like. The table has a ring buffer structure, and stores data sequentially up to a predetermined capacity. When the capacity exceeds the predetermined capacity, the oldest data is replaced with the latest data.

Returning to FIG. 2, if the acquisition of optical information from the photographing lens cannot be omitted, the process proceeds from step # 107 to step # 109, where the camera MPU 6 transmits the lens MPU.
1 to obtain optical information from the taking lens. Specifically, the distance ring of the photographing lens is electrically divided at equal intervals, and is connected to the extended position detecting unit 4. The optical information table (referred to as a lens optical information table in the flow) 5 is as shown in FIG. 4, and the lens MPU 1 obtains the current extension position from the extension position detection unit 4 and refers to the table to determine the shooting distance. , Sensitivity, and the best focus correction value, and transmits them to the camera MPU 6. Further, the defocus amount per pulse is always constant irrespective of the feeding position, and is transmitted to the camera MPU 6. Thereafter, the process proceeds to step # 110, and the optical information acquired this time is stored in the optical information table 11 on the camera described above.

In the next step # 111, the image shift amount is calculated by performing a correlation operation, and the defocus amount d (mm) is obtained. There is a relationship of “D = d−BP” between the defocus amount d (mm) obtained here and the actual defocus amount D (mm), and BP is called a best focus correction value. As is known, the best focus correction value is
Although it differs depending on the shooting lens, the extension position of the imaging lens, the imaging screen position for performing focus detection, and the type of light beam projected on the subject, in the present embodiment, the extension position is selected for simplicity of description. Only the number that changes.

Further, between the defocus amount D (mm) and the actual driving amount l (mm) of the photographing lens, "l = D /
S ", and S is called sensitivity. As is well known, the sensitivity varies depending on the photographing lens in the currently mainstream inner focus photographing lens, and depending on the extending position of the photographing lens in the single focus lens. As mentioned earlier,
The defocus amount and the lens drive amount have a non-linear relationship,
Although the sensitivity S is generally approximated by a function corresponding to the defocus amount d, in this embodiment, for simplicity of description, the sensitivity S is set to a number that changes only depending on the extension position. Further, the amount handled in the actual feeding is not represented by l itself, but is represented by the number of focus pulses P (pulse) as follows.

P = l / h = d / h / S where h (mm / pulse) is the lens extension amount per pulse. The camera MPU 6 performs step # 1
Since the optical information necessary for the automatic focus adjustment has been obtained before the number reaches 11, the calculation of the defocus amount D is performed in this step # 111, and the subsequent step # 1
At 12, the lens drive amount P is converted. afterwards,
In step # 113, the lens position is obtained.

The lens drive amount necessary for focusing is obtained in this manner. In the next step # 114, the number of focus pulses of the lens idle travel amount is corrected. As described above, when calculating the lens drive amount during the overlap control, it is necessary to consider the idle running amount of the photographing lens during the focus detection. The lens position obtained at step # 102 is used as the lens position at the start of focus detection.
The lens position obtained at 104 is the lens position at the end of focus detection, and the middle point is the lens position at the time of focus detection.
Then, the difference from the lens position obtained in the above step # 113 is taken as the lens idle travel amount and subtracted from the focus pulse number P obtained in the current focus detection, to obtain a lens drive amount necessary for focusing. Then, in the next step # 115, the lens is driven.

In the next step # 116, it is determined whether or not the switch SW1 is turned on. If the switch SW1 is turned off, the process proceeds to step # 118, and the automatic focus adjustment is stopped. On the other hand, if it is turned on, the process proceeds to step # 117, and it is determined whether focusing can be considered based on the current lens driving amount. Here, if it is determined that focusing is achieved, the process proceeds to step # 118, and the automatic focus adjustment is terminated. If it is not determined that focusing is achieved, the process returns to step # 102.
The switch S determines whether the auto focus adjustment can be determined to be in focus.
Continue until W1 is turned off.

In the above configuration, in the single focus lens, focusing on the fact that the optical information changes according to the extension position of the photographing lens, the optical information acquired in the past is stored in the storage means (optical information table 11) on the camera side. Remember,
It is determined whether the optical information currently being acquired is stored in the storage means, and when the determination is made, the acquisition of the optical information is switched to the storage means on the camera side, thereby obtaining the number of times of obtaining the optical information from the lens under the overlap control. Has been reduced. Thereby, the lens MP during the overlap control is controlled.
It is possible to reduce the processing load on the U. Specifically, it is possible to reduce the number of times the original lens processing such as lens drive control and image stabilization control is interrupted, and to exhibit sufficient performance of the interchangeable lens. be able to.

In the first embodiment,
Sensitivity required for automatic focus adjustment, best focus correction value, 1
The optical information such as the lens extension amount per pulse has been described, but the open F value, minimum F value, exit pupil value, image height exit pupil value, peripheral light drop (vignetting) correction necessary for automatic exposure and automatic light control The same applies to optical information such as values.

(Second Embodiment) Second embodiment of the present invention
This embodiment has substantially the same configuration as that of the first embodiment, and reduces the processing load on the lens MPU during the overlap control for the zoom lens having a variable focal length of the photographing lens, and replaces it. The camera is configured to enable a camera system that can exhibit sufficient performance of a lens.

FIG. 5 is a block diagram showing the structure of an interchangeable lens type single-lens reflex camera as an example of the optical apparatus according to the second embodiment of the present invention.

In FIG. 5, reference numeral 1 denotes a lens MPU for performing all calculations and controls related to the photographing lens, 2 denotes a lens driving unit for driving the photographing lens, 3 denotes a lens position detecting unit, 4 denotes a feeding position detecting unit, Reference numeral 5 denotes an optical information table unique to each interchangeable lens, such as the sensitivity, lens extension amount per pulse, and best focus correction value to be described later, and reference numeral 6 denotes a focal length detection unit. Further, an actual photographing lens (having 1 to 6) requires an aperture driving unit for driving the aperture, but the description is omitted here because it is not relevant in this embodiment.

The photographic lens is connected to the camera body via a mount indicated by a dotted line in the center of FIG. The configuration of the camera body is the same as that of the first embodiment, and a description thereof will be omitted.

Next, the automatic focusing according to the second embodiment of the present invention will be described with reference to the flowchart of FIG. The only difference from the flowchart of FIG. 2 in the first embodiment is the acquisition of the shooting distance and the focal length in step # 205.

As is known, the optical information of the zoom lens is
As with a single focus lens, some lenses change according to the extension position, and some lenses change according to the focal length. Therefore, the optical information table 11 on the camera side is as shown in FIG. 7, and stores the sensitivity, the best focus correction value, the lens extension amount per pulse, and the like according to the shooting distance and the focal length. . The optical information table 11 is searched based on the shooting distance and the focal length.

The optical information table 5 on the lens side is as shown in FIG. 8, and the lens MPU 1 shows the current extension position from the extension position detection unit 4, the current focal length from the focal length detection unit 6, The sensitivity, the best focus correction value, and the lens extension amount per pulse are determined by referring to the respective acquired and table, and can be transmitted to the camera MPU 6.

In the above configuration, in the zoom lens, focusing on the fact that optical information changes according to the extension position of the photographing lens, optical information obtained in the past is stored in the storage means (optical information table 11) on the camera side. Aside
It is determined whether the optical information currently being acquired is stored in the storage unit, and when the determination is successful, the acquisition of the optical information is switched to the storage unit on the camera side, whereby the optical information from the lens under overlap control is determined. The number of acquisitions has been reduced. Thereby, the processing load on the lens MPU during the overlap control can be reduced, and the interchangeable lens can exhibit sufficient performance.

In the second embodiment,
Sensitivity required for automatic focus adjustment, best focus correction value, 1
The optical information such as the lens extension amount per pulse has been described, but the open F value, minimum F value, exit pupil value, image height exit pupil value, peripheral light drop (vignetting) correction necessary for automatic exposure and automatic light control The same applies to optical information such as values.

(Third Embodiment) A third embodiment of the present invention.
The embodiment reduces the processing load on the lens MPU during the overlap control with respect to the single focus lens having a fixed focal length of the photographing lens, and enables a camera system that can exhibit sufficient performance of the interchangeable lens. It is configured as follows.

The structure of an interchangeable lens type single-lens reflex camera, which is an example of the optical apparatus according to the third embodiment of the present invention, is the same as that of the first embodiment shown in FIG. Illustration and description are omitted.

Hereinafter, automatic focus adjustment according to the third embodiment of the present invention will be described with reference to the flowchart of FIG.

Prior to the automatic focus adjustment, when the battery is turned on and when the taking lens is mounted, step # 401 in FIG.
From the step # 402 through the collective acquisition of the optical information of the photographing lens. Specifically, in step # 402, the camera MPU 6 performs collective acquisition of the optical information of the photographing lens by communicating with the lens MPU 1, and in the next step # 403, updates the optical information table 11 of the camera body. Do. That is, the optical information table 11 of FIG. 3 is created from all the data of the optical information table 5 of FIG. 4 described in the first embodiment.

Also in the third embodiment, the automatic focus adjustment is performed by turning on the switch SW1, and the release operation is performed by turning on the switch SW2.

In FIG. 9B, when the switch SW1 is turned on, the automatic focus adjustment starts from step # 301. First, in step # 302, the lens position is obtained from the lens position detection unit 3. Subsequently, the camera MPU 6 reads out the signals of these two images in step # 303, and performs the lens position in the next step # 304.

In the next step # 305, the photographing distance is obtained, and based on the photographing distance, the following step # 305 is performed.
In 306, the optical information table 11 of the camera body is searched.

Unlike the first embodiment, all optical information is stored in the optical information table 11 prior to automatic focusing.
Is stored in Therefore, after that, step # 307
Then, the optical information such as the sensitivity required for automatic focus adjustment, the best focus correction value, and the defocus amount per pulse is acquired. Then, in the next step # 308,
The defocus amount is calculated, and in the subsequent step # 309, the lens drive amount is converted.

The following operation is the same as that of the first embodiment, and the description is omitted.

In the above configuration, in the single focus lens, focusing on the fact that the optical information changes according to the extension position of the photographing lens, the optical information collectively acquired prior to the automatic focus adjustment is stored in the storage means (optical Information table 1
By storing in (1), the number of times of acquiring optical information from the lens during the overlap control is reduced.
Thereby, the processing load on the lens MPU during the overlap control can be reduced, and the interchangeable lens can exhibit sufficient performance.

In the third embodiment,
Sensitivity required for automatic focus adjustment, best focus correction value, 1
The optical information such as the lens extension amount per pulse has been described, but the open F value, minimum F value, exit pupil value, image height exit pupil value, peripheral light drop (vignetting) correction necessary for automatic exposure and automatic light control The same applies to optical information such as values.

(Fourth Embodiment) A fourth embodiment of the present invention.
The embodiment reduces the processing load on the lens MPU during the overlap control with respect to the zoom lens having a variable focal length of the photographing lens, and enables a camera system that can exhibit sufficient performance of the interchangeable lens. It is what was constituted.

The structure of an interchangeable-lens single-lens reflex camera, which is an example of the optical apparatus according to the fourth embodiment of the present invention, is the same as that of FIG. 5 of the second embodiment. Description is omitted.

Hereinafter, automatic focus adjustment according to the fourth embodiment of the present invention will be described with reference to the flowchart of FIG.

Prior to automatic focus adjustment, when the battery is turned on and when the taking lens is mounted, step # 60 in FIG.
From step # 602, batch acquisition of the optical information of the photographing lens is started. Specifically, in step # 602, the camera MPU 6 collectively acquires the optical information of the photographing lens by communicating with the lens MPU 1, and in the next step # 603, updates the optical information table 11 of the camera body. Do. That is, the optical information table 11 in FIG. 7 is created from all the data in the optical information table 5 in FIG. 8 described in the second embodiment.

Also in the fourth embodiment, the automatic focus adjustment is performed by turning on the switch SW1, and the release operation is performed by turning on the switch SW2.

In FIG. 10B, when the switch SW1 is turned on, the automatic focus adjustment starts from step # 501. First, in step # 502, the lens position is obtained from the lens position detection unit 3. Then, the camera MPU 6 reads out the signals of these two images in step # 503, and performs the lens position in the following step # 504. Then, in step # 505, the photographing distance and the focal length are obtained, and in the next step # 506, the optical information table 11 of the camera body is searched based on the photographing distance and the focal length.

Unlike the second embodiment, all the optical information is stored in the optical information table 11 before the automatic focusing.
Is stored in Therefore, after that, step # 507
Then, the optical information such as the sensitivity required for automatic focus adjustment, the best focus correction value, and the defocus amount per pulse is acquired. Then, in the next step # 508,
Acquisition of calculation of defocus amount, and then step # 50
At 9, the lens drive amount is converted.

The following operation is the same as that of the second embodiment, and the description is omitted.

In the above arrangement, in the zoom lens, focusing on the fact that the optical information changes according to the extension position and the focal length of the photographing lens, the optical information collectively acquired prior to the automatic focus adjustment is stored in the camera side storage means. By storing the information in the (optical information table 11), the number of times of acquiring the optical information from the lens under the overlap control is reduced. Thereby, the processing load on the lens MPU during the overlap control can be reduced, and the interchangeable lens can exhibit sufficient performance.

In the fourth embodiment,
Sensitivity required for automatic focus adjustment, best focus correction value, 1
The optical information such as the lens extension amount per pulse has been explained. And the like can be similarly applied.

(Modification) In each of the above embodiments, a single-lens reflex camera has been described. However, the present invention can be applied to other optical devices such as a video camera and an electronic still camera.

(Correspondence between the Invention and the Embodiment) In each of the above embodiments, the lens MPU 1 and the extended position detecting unit 4 correspond to the extended position detecting means of the present invention, and the lens MPU 1 and the optical information table 5 correspond to the present invention. The optical information table 5 corresponds to the first storage unit of the present invention, and the optical information table 11 corresponds to the storage unit or the second storage unit of the present invention.
1. The focal length detection unit 12 corresponds to a focal length detection unit, and the camera MPU 6 corresponds to a determination unit and a control unit.

[0077]

As described above, according to the present invention,
An object of the present invention is to provide an optical device system capable of reducing a processing load on a unit that performs lens drive control and exhibiting sufficient optical performance on the lens side.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a configuration of a camera system according to first and third embodiments of the present invention.

FIG. 2 is a flowchart showing an operation of the automatic focusing camera according to the first embodiment of the present invention.

FIG. 3 is a diagram showing an example of optical information stored in an optical information table 11 of FIG.

FIG. 4 is a diagram showing an example of optical information stored in an optical information table 5 of FIG.

FIG. 5 is a block diagram showing a configuration of a camera system according to second and fourth embodiments of the present invention.

FIG. 6 is a flowchart showing an operation of the automatic focusing camera according to the second embodiment of the present invention.

FIG. 7 is a diagram showing an example of optical information stored in an optical information table 11 of FIG.

8 is a diagram showing an example of optical information stored in an optical information table 5 of FIG.

FIG. 9 is a flowchart showing an operation of the automatic focusing camera according to the third embodiment of the present invention.

FIG. 10 is a flowchart showing an operation of the automatic focusing camera according to the fourth embodiment of the present invention.

FIG. 11 is a diagram for explaining overlap control according to the related art and the present invention.

FIG. 12 is a detailed diagram for explaining overlap control.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Lens CPU 2 Lens drive unit 3 Lens position detection unit 4 Extension position detection unit 5 Optical information table 6 Camera MPU 7 Defocus amount detection unit 11 Optical information table 12 Focal length detection unit

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) G03B 17/14 G03B 3/00 A

Claims (13)

[Claims] 1. An extended position detecting means for detecting an extended position of a lens, optical information output means for outputting optical information corresponding to each extended position of the extended position detecting means, and optical information from the optical information output means. Storage means for storing the optical information from the optical information output means, and a determination means for determining whether the optical information being obtained is stored in the storage means. An optical apparatus system, wherein when it is determined that optical information in the middle is stored in the storage means, the acquisition destination of the optical information is switched from the optical information output means to the storage means. 2. An interchangeable lens body having a feed-out position detecting means for detecting a feed-out position of a lens, and an optical information output means for outputting optical information corresponding to each feed-out position of the feed-out position detecting means. And storage means for storing optical information from the optical information output means, during the acquisition of optical information from the optical information output means,
Determining means for determining whether the optical information being obtained is stored in the storage means, and determining that the optical information being obtained is stored in the storage means, An optical device system comprising: a device main body having a control unit that switches a source of information from the optical information output unit to the storage unit. 3. An extended position detecting means for detecting an extended position of the lens, a focal length detecting means for detecting a focal length of the lens, and an extended position of the extended position detecting means and a focal length of the focal length detecting means. Optical information output means for outputting optical information according to, storage means for storing optical information from the optical information output means,
A determination unit that determines whether the optical information being obtained is stored in the storage unit during the acquisition of the optical information from the optical information output unit, and the optical information that is being obtained by the determination unit is An optical device system, wherein when it is determined that the optical information is stored in the storage unit, the acquisition source of the optical information is switched from the optical information output unit to the storage unit. 4. An extended position detecting means for detecting an extended position of a lens, a focal length detecting means for detecting a focal length of the lens, and an extended position of the extended position detecting means and a focal length of the focal length detecting means. An interchangeable lens body having optical information output means for outputting optical information corresponding to each of them; storage means for storing optical information from the optical information output means; and obtaining of optical information from the optical information output means On the way, determining means for determining whether the optical information being obtained is stored in the storage means, and when it is determined that the optical information being obtained is stored in the storage means, And a device main body having control means for switching a source of the optical information from the optical information output means to the storage means. Optical instruments system. 5. The method according to claim 1, wherein the control unit calculates at least information used for driving control of the lens in accordance with a change in the extension position of the lens based on the optical information obtained from the optical information output unit or the storage unit. The optical device system according to claim 1, wherein 6. The control means, when the determination means determines that the optical information obtained this time is not stored in the storage means, responds from the optical information output means to a lens extension position at that time. The optical device system according to claim 1, wherein the optical information is acquired, and the optical information is stored in the storage unit. 7. The optical information corresponding to the partial optical information in the storage unit when the optical information is acquired from the optical information output unit during acquisition of the partial optical information. 7. The optical device according to claim 1, wherein it is determined whether or not the optical information is stored. If the optical information is stored, it is determined that the optical information being obtained is stored in the storage unit. Equipment system. 8. The optical device system is a camera system, and the optical information includes a focal length, a photographing distance, a subject distance, an image distance, a sensitivity, a best focus correction value, and an open F value.
8. The method according to claim 1, wherein the value is at least one of a value, a minimum F value, an exit pupil value, an image height exit pupil value, a peripheral light amount drop correction value, and a lens extension amount per pulse. The optical device system according to item 1. 9. A feeding position detecting means for detecting a feeding position of a lens, a first storage means for storing optical information corresponding to each feeding position of the lens, and a second storage means.
And all the optical information corresponding to each of the extending positions of the lens is obtained from the first storage unit before the lens drive control, and all the optical information is stored in the second storage unit. Optical information acquiring means for acquiring the optical information corresponding to each of the lens extending positions from the optical information acquiring means at the time of the lens driving control, and information used for the lens driving control according to the change of the lens extending position. An optical apparatus system comprising at least control means for calculating. 10. A lens main body having a feed-out position detecting means for detecting a feed-out position of a lens, a first storage means for storing optical information corresponding to each of the feed-out positions of the lens, and a second storage means. Prior to the lens drive control, obtaining all optical information corresponding to each of the extending positions of the lens from the first storage means, and obtaining all the optical information in the second storage means. Means, and at the time of the lens driving control, acquiring optical information corresponding to each of the lens extending positions from the optical information acquiring means, and calculating at least information used for the lens driving control with a change in the lens extending position. An optical device system comprising: a device main body having control means. 11. An extension position detection unit for detecting an extension position of a lens, a focal length detection unit for detecting a focal length of the lens, and optical information corresponding to the extension position of the lens and the focal length, respectively. A first storage unit, a second storage unit, and, prior to lens drive control, acquiring all optical information corresponding to the lens extension position and the focal length from the first storage unit, An optical information acquisition unit that stores all optical information in the second storage unit; and an optical information acquisition unit that acquires optical information corresponding to the lens extension position and the focal length during the lens drive control. And control means for calculating at least information used for the lens drive control in accordance with a change in the extension position of the lens. An optical device system characterized by the above. 12. A payout position detecting means for detecting a payout position of a lens, a focal length detecting means for detecting a focal length of the lens, and optical information corresponding to the payout position of the lens and the focal length, respectively. A lens main body having a first storage unit, a second storage unit, and prior to lens drive control, all the optical information corresponding to the extension position of the lens and the focal length from the first storage unit, respectively. Acquired,
Optical information acquisition means for storing all the optical information in the second storage means, and at the time of the lens drive control,
An apparatus body having control means for acquiring optical information corresponding to each of the lens extending position and the focal length from the optical information acquiring means, and calculating at least information used for the lens drive control according to a change in the lens extending position. An optical device system comprising: 13. The optical device system is a camera system, wherein the optical information includes a focal length, a photographing distance, a subject distance, an image distance, a sensitivity, a best focus correction value, an open F value, a minimum F value, and emission. 13. A pupil value, an image height exit pupil value, a peripheral light amount drop correction value, and at least one of a lens extension amount per pulse.
The optical device system according to any one of the above.