JP3909175B2 - Imaging device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention includes a lens group for zooming that moves along the optical axis direction, a lens group that is positioned behind and moves along the optical axis direction, and a photoelectric converter behind the lens group. In the image pickup apparatus, an automatic focus adjustment function that adjusts the focus according to a detection level of a high-frequency component included in a subject image formed on the sensor surface of the photoelectric converter through the lens group, and a manual that adjusts the focus by a user operation The present invention relates to an image pickup apparatus having a focus adjustment function and a zooming function for controlling the movement of the lens group for zooming.
[0002]
[Prior art]
In order from the subject side, it has a variator lens group that moves along the optical axis for zooming, and a compensator lens group that moves along the optical axis direction to adjust the focus. In an imaging apparatus having means for controlling the light amount accumulation time, a manual focus adjustment function for adjusting a focus by a user instructing a driving amount and a direction of a compensator lens group by a button operation or the like;
As shown in Japanese Laid-Open Publication No. 63-181571, Japanese Laid-Open Publication No. 63-125910, and the like, high-frequency components included in a video signal obtained by converting a subject image formed on the sensor surface of the photoelectric converter through the lens group by the photoelectric converter. Some of them have both an automatic focus adjustment function that adjusts the focus by driving the compensator lens group according to the amount of focus shift obtained from the detection level.
[0003]
Conventionally, in the imaging apparatus, the automatic focus adjustment function and the manual focus adjustment function do not operate at the same time. When performing manual focus adjustment while the automatic focus adjustment function is in operation, it is necessary to switch to the manual focus adjustment function. The manual focus adjustment function and the automatic focus adjustment function are switched by a button operation by the user.
[0004]
[Problems to be solved by the invention]
Japanese Patent Laid-Open No. 63-80688 discloses a technique for increasing the light amount accumulation time of the photoelectric converter as the subject illuminance becomes dark as a technique for improving the photographing sensitivity for a low illuminance subject.
[0005]
However, in the case where the imaging sensitivity is improved by the above-described method in the imaging apparatus, the focus voltage (detection level of the high-frequency component included in the captured image) necessary for automatic focus adjustment as the output period of the accumulated video signal becomes longer. The period to obtain becomes longer. For this reason, as the subject illuminance decreases, the automatic focus adjustment function cannot follow the change in the subject distance. Furthermore, if the zooming operation is performed at this time, the above-described imaging device needs to adjust the focus by moving the compensator lens group in order to correct the focal plane change accompanying the movement of the variator lens group for zooming. There is. For this reason, when zooming is performed, the amount of movement of the compensator lens group is increased, and accurate focus adjustment becomes difficult, resulting in defocusing. Conventionally, if manual focus adjustment is performed for the defocus at the time of zooming, manual focus adjustment cannot be performed while the automatic focus adjustment function is operating, so the user can switch to the manual focus adjustment function. An operation and a return operation to the automatic focus adjustment function are required, and the user is required to perform a complicated operation.
[0006]
On the other hand, when the light amount accumulation time is short, the period for obtaining the focus voltage is shortened, so that the auto focus adjustment function has high followability to the subject distance change and the focal plane change, and the focus is manually adjusted during the operation of the auto focus adjustment function. There is no need to make adjustments.
[0007]
In the present invention, in consideration of the above points, when it is necessary to perform manual focus adjustment due to a decrease in focusing accuracy of the automatic focus adjustment function during the operation of the automatic focus adjustment function, a frequent switching operation is not required. The purpose is to enable manual focus adjustment.
[0008]
[Means for Solving the Problems]
In order to achieve the above object, the present invention uses the configuration described in the claims as an example.
[0010]
DETAILED DESCRIPTION OF THE INVENTION
FIG. 1 is a block diagram showing an embodiment of the present invention. 101 is a variator lens group (hereinafter referred to as a V lens) capable of moving along the optical axis direction for zooming, and 102 is a compensator lens group capable of moving along the optical axis direction for focus adjustment. (Hereinafter referred to as C lens), 103 is a diaphragm, 104 is a photoelectric converter, 105 is an amplification circuit that amplifies the output of the photoelectric converter 104, and 106 determines the brightness of the picked-up image to obtain a desired brightness. In the same manner, a light amount adjusting unit for adjusting the aperture of the diaphragm 103, the light amount accumulation time of the photoelectric converter 104, and the gain of the amplifier circuit 105, 117 is a driving unit for driving the V lens 101, and 118 is for driving the C lens 102. 119 is a drive unit for driving the diaphragm 103, 120 is a driver for controlling the drive unit 117, 121 is a driver for controlling the drive unit 118, and 122 is for controlling the drive unit 119. Driver, 123 is a position detection unit that detects the position of the V lens 101, 124 is a position detection unit that detects the position of the C lens 102, and 113 is a switch for the user to instruct the driving of the C lens and its driving direction or stop. , 115 is a switch for the user to instruct driving of the V lens and its driving direction or stop, 107 is a focus voltage calculation unit for calculating a focus voltage b which is a detection level of a high frequency component included in the video signal a, and 108 A focus determination unit 109 for determining a focus state from the focus voltage b, 109 a drive amount calculation unit for calculating the drive direction and drive amount of the C lens 102 based on the focus determination result c, and 110 according to an instruction m of the switch 113. A driving amount calculation unit 111 for calculating the driving direction and driving amount of the C lens 102, 111 is arranged in parallel with the driving direction of the V lens 101 according to the instruction n of the switch 115. V lens drive amount calculation unit for calculating the drive amount, 114 is a switch for the user to instruct the focus adjustment means, 112 is to adjust the output d of the drive amount calculation unit 109 and the output g of the drive amount calculation unit 110 A drive amount adjustment unit 125 that mixes at an arbitrary ratio, and a variable magnification unit 125 outputs the drive amount f resulting from correcting the mixed drive amount f ′ from the drive amount adjustment unit 112 according to the magnification change operation to the driver 121. A correction unit 116 is an input device for the user to change the operation characteristics of the drive amount adjustment unit 112.
[0011]
The operation of the apparatus having the above configuration will be described.
[0012]
When the manual focus adjustment function is instructed by the user via the switch 114 and the zooming operation is not performed, the operation 1 is an instruction to drive the C lens 102 and the driving direction or stop input from the switch 113 by the user. The drive amount g according to the instruction m is output from the drive amount calculation unit 110 by m. At this time, the drive amount adjustment unit 112 outputs the output drive amount g of the drive amount calculation unit as it is as the mixed drive amount f ′ to the magnification correction unit 125, while blocking the output drive amount d of the drive amount calculation unit 109. Then, the zoom correction unit 125 recognizes that there is no zooming operation based on the signal j indicating the zoom operation state from the drive amount calculation unit 111, and does not correct the mixed drive amount f ′ without performing the correction to the mixed drive amount f ′. Is output to the driver 121 as the drive amount f. Accordingly, the C lens 102 moves by a driving amount g corresponding to only a user instruction input from the switch 113. In the operation 1, the C lens 102 is driven according to the operation of the user of the switch 113, and manual focus adjustment is performed to adjust the focus of the subject image formed on the photoelectric converter 104.
[0013]
In the operation 2 when the auto focus adjustment function is instructed by the user via the switch 114 and the zooming operation is not performed, the subject image to be photographed passes through the V lens 101 and the C lens 102 and is further photoelectrically converted through the aperture 103. The image is formed on the sensor surface of the device 104. The photoelectric converter 104 converts the formed subject image into a video signal a ′ and outputs it to the amplifier circuit 105. The video signal a amplified by the amplifier circuit 105 is input to the focus voltage calculation unit 107, and the focus voltage b that is the detection level of the high frequency component detected from the video signal a by the focus voltage calculation unit 107 is output. Then, the focus determination unit 108 determines the degree of focus based on the focus voltage b, and outputs the focus shift amount and the focus direction to the focus as the focus determination result c. The drive amount calculation unit 109 outputs the drive amount d of the C lens 102 calculated according to the focus determination result c. At this time, the drive amount adjustment unit 112 outputs the output drive amount d of the drive amount calculation unit 109 as it is as the mixed drive amount f ′ to the magnification correction unit 125, while blocking the output drive amount g of the drive amount calculation unit 110. Then, the zoom correction unit 125 recognizes that there is no zooming operation based on the signal j indicating the zoom operation state from the drive amount calculation unit 111, and does not correct the mixed drive amount f ′ without performing the correction to the mixed drive amount f ′. Is output as a drive amount f. Accordingly, the C lens 102 moves by the driving amount d calculated only according to the determination result c of the focus determination unit 108. In the operation 2, the photoelectric converter 104 is driven by driving the C lens 102 according to the result c obtained by determining the focus voltage b included in the video signal a input to the focus voltage calculation unit 107 by the focus determination unit 108. The focus of the subject image formed on the top is adjusted, and automatic focus adjustment is performed by a closed loop in which the resultant video signal a is input to the focus voltage calculation unit 107 again.
[0014]
In the operation 1, in the operation 3 when the driving of the V lens 101 is instructed by the user by the switch 115 and the zooming operation is performed, the driving from the switch 115 and the instruction of the driving direction are instructed by the V lens driving amount calculation unit 111. The corresponding driving amount l is output to the driver 120, and the scaling operation is performed. At this time, the driving amount adjusting unit 112 outputs the output driving amount g of the driving amount calculating unit 110 as it is as the mixed driving amount f ′, and the output of the driving amount calculating unit 109 is cut off. The zooming correction unit 125 recognizes that the zooming operation is being performed based on the signal j indicating the zooming operation state from the drive amount calculation unit 111, and mixes from the position o of the C lens 102 obtained from the position detection unit 124. The position of the C lens when moved by the driving amount f ′ is calculated, and the subject distance determined from the relative relationship between the calculated position of the C lens and the position p of the V lens 101 obtained from the position detection unit 123 is obtained. A locus of the C lens (hereinafter referred to as a cam curve) with respect to the movement of the V lens at the subject distance is calculated. Then, the C lens position with respect to the V lens position k after driving the V lens input from the drive amount calculation unit 111 is obtained from the cam curve, and the drive amount f to the C lens position is output to the driver 121. In the operation 3, the focus of the subject image formed on the photoelectric converter 104 by the drive amount f obtained by performing the focus correction accompanying the magnification change operation on the drive amount g according to the manual focus adjustment by the user's operation of the switch 113. Adjust the focus manually during zooming.
[0015]
In the operation 2, when the user instructs to drive the V lens 101 by the switch 115 and performs the zooming operation, in the operation 4, the V lens driving amount calculation unit 111 instructs the driving from the switch 115 and the driving direction thereof. The corresponding driving amount l is output to the driver 120, and the scaling operation is performed. The drive calculation unit 109 outputs a driving amount d of automatic focus adjustment calculated according to the result c of focusing determination based on the focus voltage b included in the video signal a as in the operation 2, and the drive calculation unit Similarly to the operation 1, the driving amount g for manual focus adjustment calculated according to the driving instruction m for the C lens 102 input from the switch 113 by the user is output from 110. At this time, the drive amount adjustment unit 112 adjusts the ratio of the drive amount d and the drive amount g according to the light amount accumulation time e obtained from the light amount adjustment unit 106 and outputs the mixed drive amount f ′ to the magnification correction unit 125. When the zooming correction unit 125 recognizes that the zooming operation is being performed based on the signal j indicating the zooming operation state from the drive amount calculation unit 111, the zooming correction unit 125 calculates the cam curve in the same manner as the operation 3, and Similarly, the C lens position with respect to the V lens position k after driving the V lens input from the drive amount calculation unit 111 is obtained from the cam curve, and the drive amount f to the C lens position is output to the driver. In the operation 4, the driving amount g for manual focus adjustment by the user's operation of the switch 113 and the driving amount d for automatic focus adjustment according to the result c determined by the in-focus determination unit 108 are adjusted and mixed. Automatic focus adjustment at the time of zooming that adjusts the focus of the subject image formed on the photoelectric converter 104 by driving the C lens 102 by a drive amount f obtained by applying a focus correction amount accompanying the zooming operation to f ′. And manual focus adjustment by the user during automatic focus adjustment.
[0016]
Next, detailed operation of the drive amount adjusting unit 112 in one embodiment will be described.
[0017]
FIG. 2 is a block diagram showing the inside of the drive amount adjusting unit 112 in FIG. 201 is an adjustment ratio calculation unit that determines an adjustment ratio of the drive amount d and the drive amount g, 205 is a storage element that holds a plurality of adjustment ratios of the drive amount d and the drive amount g corresponding to the light amount accumulation time e, and 202 is an adjustment. An integration unit that integrates the output q of the ratio calculation unit 201 and the drive amount d, 203 an integration unit that integrates the output r and the drive amount g of the adjustment ratio calculation unit 201, and 204 an output s of the integration unit 202 and the integration unit 203. An adder that adds the output t to obtain a drive amount f ′.
[0018]
FIG. 3 is an example of a characteristic diagram showing an adjustment ratio between the drive amount d and the drive amount g using the light amount accumulation time as a parameter. A curve 301 is an adjustment ratio q of the drive amount d, and a curve 302 is an adjustment ratio r of the drive amount g. Represents. The light amount accumulation time A represents the light amount accumulation time when the control force by the automatic focus adjustment function is attenuated and the sensitivity of the manual focus adjustment function starts to increase as the light amount accumulation time becomes longer. The light amount accumulation time C is not subjected to automatic focus adjustment and is manually performed. It represents the amount of light accumulation time that begins to become focus adjustment only by focus adjustment. The relationship between the light amount accumulation time and the drive amount ratio shown in this characteristic diagram is held in the storage element 205.
[0019]
In the configuration of FIG. 2, when the manual focus adjustment function is instructed by instruction h (operation 1 and operation 3), the adjustment ratio calculation unit 201 outputs 0 as the adjustment ratio q to the integration unit 202. For 203, 1 is output as the adjustment ratio r. Therefore, the integration result s of the integration unit 202 is 0, the integration result t of the integration unit 203 is equivalent to the drive amount g, and the addition unit 204 outputs a drive amount f ′ equivalent to the drive amount g.
[0020]
When the automatic focus adjustment function is instructed by the instruction h, and the signal j indicating the magnification operation state indicates that there is no magnification operation (the operation 2), the adjustment ratio calculation unit 201 sets the adjustment unit q as the adjustment ratio q. 1 is output, and 0 is output to the integrating unit 203 as the adjustment ratio r. Therefore, since the integration result s of the integration unit 202 is equivalent to the drive amount d and the integration result t of the integration unit 203 is 0, the addition unit 204 outputs a drive amount f ′ equivalent to the drive amount d.
[0021]
When the automatic focus adjustment function is instructed by the instruction h, and the signal j indicating the magnification operation state indicates that the magnification operation is being performed (operation 4), the adjustment ratio calculation unit 201 adjusts the driving amount corresponding to the light amount accumulation time e. The ratio is read from the storage element 205, and a value according to the read ratio is output to the integration unit 202 and the integration unit 203. For example, when the light amount accumulation time is B in FIG. 3, 0.25 is output as the adjustment ratio q and 0.75 is output as the adjustment ratio r. Then, the result s accumulated by the accumulating unit 202 and the result t accumulated by the accumulating unit 203 are added by the adding unit 204, and the result is output as the drive amount f ′.
[0022]
Note that the adjustment ratio output to the integration unit 202 and the integration unit 203 may take a value of 1 or more.
[0023]
Similarly to the operation of the automatic focus adjustment function with zooming, the light amount accumulation time A in FIG. 3 is also obtained when the manual focus adjustment function is activated or when the automatic focus adjustment function without zooming is activated. By appropriately reading out the corresponding adjustment ratio from the storage element 205, it is possible to equalize the processing in the adjustment ratio calculation unit. Further, the storage element 203 stores only one curve representing the ratio characteristic, for example, the curve 301 in FIG. 3, and the adjustment ratio calculation unit 201 stores the other curve, in the above example, the curve 302 in FIG. It is also possible to calculate appropriately and obtain the adjustment ratio.
[0024]
When the user specifies values corresponding to the light amount accumulation time A and the light amount accumulation time C in the characteristics shown in FIG. 3 in the characteristic data i, the contents of the storage element 205 are stored in the adjustment ratio calculation unit 201 according to the characteristic data i. Change to operate with the characteristics intended by the user. For example, when the user designates the value corresponding to the light amount accumulation time A in FIG. 3 as A ′ and the value corresponding to the light amount accumulation time C as C ′ in the characteristic data i in FIG. 3 is calculated, and the ratio characteristic shown in FIG. 3 stored in the storage element 205 is changed to the ratio characteristic shown in FIG. In the above example, the light amount accumulation time at which the control force by the automatic focus adjustment function is attenuated and the sensitivity of manual focus adjustment begins to increase is set to a longer time, and the light amount accumulation time for focus adjustment only by manual focus adjustment is shorter. Set to
[0025]
Further, a plurality of ratio characteristics as shown by the curves 501, 502, 503, and 504 in FIG. 5 are stored in the storage element 205 in advance, and the characteristics that replace the characteristic curves 301 and 302 in FIG. When the characteristic data i is designated by the user from the ratio characteristic, the characteristic according to the characteristic data i is selected from the plurality of ratio characteristics stored in the storage element 205 by the adjustment ratio calculation unit 201, and the selected characteristic thereafter An operation close to the user's intention can also be realized by the method of operating at.
[0026]
Note that the operation of the drive amount adjusting unit 112 can also be realized by using a microcomputer program and a rewritable storage element.
[0027]
In the above-described embodiment, when the auto focus adjustment function is in operation and the zooming operation is performed, if the focusing accuracy of the auto focus adjustment function is reduced, the switch to the manual focus adjustment function is not required manually. While it is possible to adjust the focus, the focus accuracy of the automatic adjustment function can be sufficiently obtained, and the influence of the user's operation can be eliminated in a state where the focus adjustment by the user is unnecessary.
[0028]
Further, it is possible to increase the sensitivity of the focus adjustment by the user as the focusing accuracy of the automatic focus adjustment function is lowered, and to reduce the defocus due to the automatic focus adjustment function.
[0029]
Furthermore, the sensitivity of manual focus adjustment during the operation of the automatic focus adjustment function can be adjusted to a sensitivity that matches the user, and the user's operational feeling can be improved.
[0030]
【The invention's effect】
As described above, according to the present invention, when manual focus adjustment is performed for defocus when zooming is performed at the time of automatic focus adjustment, the manual focus adjustment function that has been conventionally required by the user is complicated. It is possible to manually adjust the focus without performing any switching operation.
[0031]
Further, it is possible to change the sensitivity of the manual focus adjustment while the automatic focus adjustment function is operating according to the difficulty level of the manual focus adjustment and the focusing accuracy of the automatic focus adjustment function.
[0032]
In addition, there is an effect of suppressing the focus shift by the automatic focus adjustment function because the focus accuracy of the automatic focus adjustment function is lowered even though the subject is not changed and the focus is achieved. .
[0033]
Furthermore, the sensitivity of manual focus adjustment during the operation of the automatic focus adjustment function can be adjusted to a sensitivity that matches the user, and the user's operational feeling can be improved.
[Brief description of the drawings]
FIG. 1 is a block diagram showing a configuration of one embodiment of an imaging apparatus according to the present invention.
FIG. 2 is a block diagram showing the inside of a drive amount adjustment unit of one embodiment.
FIG. 3 is a characteristic diagram illustrating an operation of a drive amount adjusting unit according to an embodiment.
FIG. 4 is a characteristic diagram illustrating an operation of a drive amount adjustment unit after a ratio characteristic change by a user according to one embodiment.
FIG. 5 is a characteristic diagram illustrating an operation of a drive amount adjustment unit.
[Explanation of symbols]
101 ... Variator lens group,
102 ... Compensator lens group,
103 ... Aperture,
104: photoelectric converter,
105... Amplifier circuit,
106: Light quantity adjustment unit,
107... Focus voltage calculator,
108 ... In-focus determination unit,
109 to 111... Drive amount calculation unit,
112... Drive amount adjustment unit 113 to 115... Switch
116: User input device,
117-119 ... drive part,
120-122 ... driver,
123, 124 ... position detection unit,
125... Scaling correction unit,
201 ... adjustment ratio calculation unit,
202, 203 ... integrating unit,
204... Addition unit,
205... Storage element,
301, 302 ... Output ratio of drive amount,
a '... photoelectrically converted video signal,
a ... amplified video signal,
b: Focus voltage,
c: Focus determination result,
d, g ... C lens driving amount,
e: Light intensity accumulation time,
f '... mix drive amount,
f: Driving amount after zoom correction,
h: Instruction to switch between automatic focus adjustment function and manual focus adjustment function,
i: Adjustment ratio characteristic data,
j: a signal indicating a zooming operation state,
k: V lens position after driving the V lens,
l ... V lens drive amount,
m ... C lens drive instruction,
n ... V lens drive instruction,
o ... C lens position,
p ... V lens position,
q, r ... adjustment ratio,
s, t ... integration results

Claims (8)

A first lens group that moves along the optical axis and performs zooming, a second lens group that moves along the optical axis and performs focusing, and a first position detection that detects the position of the first lens group Means, second position detecting means for detecting the position of the second lens group, first lens driving means for driving the first lens group, and second lens driving means for driving the second lens group;
A photoelectric converter that is located behind the first lens group and the second lens group, converts light passing through the lens group into an electrical signal, and a focus voltage detection unit that detects a high-frequency component from the output of the photoelectric converter; A focus determination unit that determines a shift amount (defocus amount) from the in-focus position, and a drive amount calculation unit that calculates a movement amount of the second lens group from an output of the focus determination unit. An automatic focus adjuster that automatically adjusts the focus of the subject image formed on the photoelectric converter in a configuration that transmits the output of the amount calculation means to the drive means of the second lens group;
A manual focus adjuster for manually adjusting the focus by driving the second lens group with an output of a drive amount calculation means for calculating a drive amount by a user operation;
In the configuration of the imaging apparatus including a light amount adjusting unit that controls the amount of light incident on the photoelectric converter, a drive amount adjusting unit that adjusts the output of the automatic focus adjuster and the manual focus adjuster is provided.
When the light amount accumulation time of the photoelectric converter controlled by the light amount adjusting unit is equal to or shorter than a first time, the drive amount adjusting unit sets the output ratio of the driving amount calculating unit of the automatic focus adjuster to 1, and the manual focus The output ratio of the controller drive amount calculation means is 0,
When the light amount accumulation time is equal to or longer than a second time longer than the first time, the drive amount adjustment unit sets the output ratio of the drive amount calculation means of the automatic focus adjuster to 0, and drives the manual focus adjuster. The output ratio of the quantity calculation means is 1,
When the light amount accumulation time is longer than the first time and shorter than the second time, the drive amount adjustment unit sets the output ratio of the drive amount calculation means of the automatic focus adjuster in proportion to the light amount accumulation time. An imaging apparatus comprising: means for decreasing and increasing the output ratio of the driving amount calculation means for the manual focus adjuster, and controlling the second lens group.   In the configuration of claim 1, a drive amount adjustment unit and a storage element for adjusting outputs of the automatic focus adjuster and the manual focus adjuster are provided, and the light amount accumulation time of the photoelectric converter controlled by the light amount adjustment unit is set. When the drive amount adjustment unit stores in advance the mixing ratio of the output of the drive amount calculation means of the automatic focus adjuster and the output of the drive amount calculation means of the manual focus adjuster in the storage element, and performs mixed output An image pickup apparatus, wherein the second lens group is controlled by mixing and outputting using a mixing ratio stored in the storage element.   2. The configuration of claim 1, further comprising a drive amount adjusting unit and a storage element for adjusting outputs of the automatic focus adjuster and the manual focus adjuster, wherein the drive amount adjusting unit includes: A plurality of mixing ratios of the output and the output of the driving amount calculating means of the manual focus adjuster and at least one light quantity accumulation time of the photoelectric converter controlled by the light quantity adjusting means are previously stored in the storage element; The present invention compares the current light amount accumulation time with the stored light amount accumulation time, mixes and outputs using a mixture ratio selected from a plurality of stored mixture ratios, and controls the second lens group. An imaging device.   4. The configuration of claim 3, further comprising a drive amount adjusting unit and a storage element for adjusting outputs of the automatic focus adjuster and the manual focus adjuster, wherein the drive amount adjusting unit includes the drive amount calculating unit of the automatic focus adjuster. A plurality of mixing ratios of the output and the output of the driving amount calculating means of the manual focus adjuster and at least one light quantity accumulation time of the photoelectric converter controlled by the light quantity adjusting means are previously stored in the storage element; Further, by providing an input means for changing the contents of the storage element from the user, it is possible to make these changes, compare the current light amount accumulation time with the stored light amount accumulation time, An imaging apparatus, wherein the second lens group is controlled by mixing and outputting using a mixing ratio selected from mixing ratios. A first lens group that moves along the optical axis and performs zooming, a second lens group that moves along the optical axis and performs focusing, and a first position detection that detects the position of the first lens group Means, second position detecting means for detecting the position of the second lens group, first lens driving means for driving the first lens group, and second lens driving means for driving the second lens group;
A photoelectric converter that is located behind the first lens group and the second lens group, converts light passing through the lens group into an electrical signal, and a focus voltage detection unit that detects a high-frequency component from the output of the photoelectric converter; A focus determination unit that determines a shift amount (defocus amount) from the in-focus position, and a drive amount calculation unit that calculates a movement amount of the second lens group from an output of the focus determination unit. An automatic focus adjuster that automatically adjusts the focus of the subject image formed on the photoelectric converter in a configuration that transmits the output of the amount calculation means to the drive means of the second lens group;
A manual focus adjuster for manually adjusting the focus by driving the second lens group with an output of a drive amount calculation means for calculating a drive amount by a user operation;
Furthermore, zoom driving means for driving the first lens group with the output of the driving amount calculating means for calculating the driving amount according to another instruction from the user,
In the configuration of the imaging apparatus including a light amount adjusting unit that controls the amount of light incident on the photoelectric converter, a drive amount adjusting unit that adjusts the output of the automatic focus adjuster and the manual focus adjuster is provided.
When the light amount accumulation time of the photoelectric converter controlled by the light amount adjusting unit is equal to or shorter than a first time, the drive amount adjusting unit sets the output ratio of the driving amount calculating unit of the automatic focus adjuster to 1, and the manual focus The output ratio of the controller drive amount calculation means is 0,
When the light amount accumulation time is equal to or longer than a second time longer than the first time, the drive amount adjustment unit sets the output ratio of the drive amount calculation means of the automatic focus adjuster to 0, and drives the manual focus adjuster. The output ratio of the quantity calculation means is 1,
When the light amount accumulation time is longer than the first time and shorter than the second time, the drive amount adjustment unit sets the output ratio of the drive amount calculation means of the automatic focus adjuster in proportion to the light amount accumulation time. Means for decreasing and increasing the output ratio of the driving amount calculating means of the manual focus adjuster, and controlling the second lens group with the mixed output only when the first lens group is driven. An imaging device.   In the structure of Claim 5, the drive amount adjustment part and memory | storage element which adjust the output of an automatic focus adjuster and a manual focus adjuster are provided, According to the light quantity accumulation time of the photoelectric converter controlled by the said light quantity adjustment means, In the drive amount adjustment unit, a mixing ratio between the output of the drive amount calculation unit of the automatic focus adjuster and the output of the drive amount calculation unit of the manual focus adjuster is stored in the storage element in advance, and the first lens group An image pickup apparatus characterized by controlling the second lens group by mixing and outputting the mixture ratio stored in the storage element only when the lens is driven.   6. The configuration of claim 5, wherein a drive amount adjusting unit and a storage element for adjusting outputs of the automatic focus adjuster and the manual focus adjuster are provided, and the drive amount adjusting unit includes: A plurality of mixing ratios of the output and the output of the driving amount calculating means of the manual focus adjuster and the light amount accumulation time of the photoelectric converter controlled by at least one light amount adjusting means are stored in the storage element in advance. The current light amount accumulation time is compared with the stored light amount accumulation time, and only when the first lens group is driven, the mixture is output using a mixture ratio selected from a plurality of stored mixture ratios. And controlling the second lens group. 8. The configuration according to claim 7, wherein a drive amount adjusting unit and a storage element for adjusting outputs of the automatic focus adjuster and the manual focus adjuster are provided, and the drive amount calculating unit of the automatic focus adjuster includes the drive amount adjusting unit. A plurality of mixing ratios of the output and the output of the driving amount calculating means of the manual focus adjuster and the light amount accumulation time of the photoelectric converter controlled by at least one light amount adjusting means are stored in the storage element in advance. Furthermore, these changes can be made possible by providing an input means for changing the contents of the storage element from the user,
The current light amount accumulation time is compared with the stored light amount accumulation time, and only when the first lens group is driven, the mixture is output using a mixture ratio selected from a plurality of stored mixture ratios. And controlling the second lens group.

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