JP2003348393A - Digital camera - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a digital camera which does not impart a feeling of incompatibility to a photographer based upon the idea completely different from conventional ideas and is highly functional but has inexpensive and compact configuration. <P>SOLUTION: When lens groups 51 and 52 are driven for zooming, driving for focusing is performed as well such that an angle of view of an image displayed on an image display part 8 is not linearly changed during zooming. Even in such a case, updating of image indication on the image display part 8 is stopped to perform so-called freezing of the display image. Thus, even while the photographer watches the image display part 8, the feeling of incompatibility is not imparted. <P>COPYRIGHT: (C)2004,JPO

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a digital camera, and more particularly, to a digital camera having a zoom function and an image display function.

[0002]

2. Description of the Related Art With the improvement of electronic technology, digital cameras such as a digital still camera for converting a captured image into digital data and storing the data have been developed and are already on the market. A user can display an image captured by a digital camera on, for example, a display of his / her personal computer, and can print the image via a printer, so that the application range is wide.

[0003]

By the way, there is a demand for miniaturization and cost reduction in digital cameras as well. However, an additional function such as a zoom function has an effect of increasing the value as a product, and therefore cannot be easily omitted even if it causes a size increase and a high cost. In response to such a demand, there has been an attempt to integrate a motor for driving a zooming optical system and a motor for driving a focus, which are separately provided in a conventional digital camera with a zoom function. . However, such attempts include:
It was expected that there would be problems specific to digital cameras.
This problem will be described.

In a so-called silver halide camera, a configuration is known in which a driving power from a single motor is used to drive a photographing optical system in a zoom drive and a focus drive (JP-A-200200).
1-174688). This is called a step zoom method, in which the zoom position is set in steps,
Since the focusing operation is performed between adjacent zoom positions, there is an advantage that the zoom operation and the focusing operation can be performed only by providing one motor as a driving source. Therefore, it has been considered to incorporate the configuration of the step zoom system into an electronic camera.

[0005] However, in a general digital camera, if the power is turned on regardless of the operation of the release switch in order for the photographer to confirm the subject, an image acquired through an image pickup device such as a CCD is obtained. There is an electronic finder function that can display a subject image on a monitor based on data. Therefore, if the configuration of the step zoom system is simply incorporated into a digital camera, the size of the angle of view changes nonlinearly with the movement of the taking lens when performing a focusing operation with the zoom position. Since the changed state is displayed on the monitor one by one by the electronic finder function, there is a problem that the photographer who is looking at the monitor feels strange. In particular, JP-A-9-80291
JP-A-9-189844, JP-A-11-1190
In the case of using an optical system that also changes the focal length in the focusing operation as disclosed in Japanese Patent No. 83, such a problem becomes more prominent.

[0006] A similar problem is that the driving of the lens of the variable-magnification optical finder employed in some silver halide cameras and digital cameras is performed in association with the driving of the photographing lens, and the step zoom system is used. Although it may occur even when the configuration is adopted, such a variable magnification optical viewfinder,
For example, by providing a clutch mechanism that disconnects the lens of the optical finder from the drive of the photographing lens during the focusing operation, it is possible to prevent a photographer looking at the subject through the optical finder from feeling uncomfortable. However, as long as the photographing lens is moved for focus driving, the subject image formed on the image sensor changes, so that as long as the electronic finder function is exhibited, the image ( Angle of view) will also change. Therefore, it is desired to solve this problem based on a completely different design concept.

The present invention has been made in view of the above-mentioned problems of the prior art, and based on a completely different idea from the conventional art, does not give a photographer a sense of incongruity, and has a low-cost and compact structure with high functionality. The purpose is to provide a digital camera.

[0008]

In order to achieve the above object, a digital camera according to a first aspect of the present invention forms an image via a photographic optical system having a plurality of lens groups and the photographic optical system. An image sensor that receives an optical image and outputs an image signal;
A display unit that displays an image while updating at a predetermined timing based on an image signal output from the image sensor,
Driving means for performing driving for a focusing operation and driving for a zoom operation by moving a lens group of the imaging optical system in the optical axis direction by power from a single driving source; and A zoom switch for performing a drive for a zoom operation; and, after operating the zoom switch, causing the driving unit to start moving the lens group of the photographing optical system, and after the lens group starts moving. And control means for interrupting the updating of the image display on the display unit until the lens group stops, so that when the lens group is driven for a zoom operation, driving for a focusing operation is also performed. In the case where the angle of view of the image displayed on the display unit does not change linearly during the zooming operation, the display of the image on the display unit is interrupted to update the display. Image is a so-called freeze the can so the photographer does not inspire uncomfortable even if viewing the display unit. The present invention is particularly effective when a digital camera shoots in a predetermined direction, for example, when a digital camera is fixed to a tripod, and self-timer shooting is performed.

Further, the control means preferably stops the lens group in response to the interruption of the operation of the zoom switch, so that the angle of view intended by the photographer (or the operator) can be obtained. .

If the stop position of the lens group is determined in advance, the structure of the digital camera can be further simplified.

Further, it is preferable that the control means restarts updating the image display on the display unit after the lens group is stopped, so that the photographer can confirm the composition of the subject before photographing.

According to a second aspect of the present invention, there is provided a digital camera, comprising: a photographing optical system having a plurality of lens groups; and an image pickup device for receiving an optical image formed through the photographing optical system and outputting an image signal. An element, a display unit for displaying an image based on an image signal output from the image sensor, and a lens from the photographing optical system moved in the optical axis direction by power from a single drive source to perform focusing. A driving unit that performs driving for operation and a driving for zoom operation; a zoom switch that causes the driving unit to perform driving for zoom operation; and a driving unit that performs driving for the zooming operation. Control means for starting the movement of the lens group of the photographing optical system, and after updating the lens group, suspending updating of image display on the display unit until the lens group reaches a predetermined position. Therefore, when the lens group is driven for a zoom operation, driving for a focusing operation is also performed, so that the angle of view of an image displayed on the display unit during the zoom operation does not linearly change. Also, by freeze-displaying the display image until it reaches the predetermined position, it is possible to prevent the photographer from feeling uncomfortable even when the photographer is viewing the display unit. It is apparent that, when there are three predetermined positions, when the lens group is moved from the first position to the second position and a zoom operation is performed, an image obtained at the first position is obtained. Is frozen to the second position, and further moved from the second position to the third position to perform a zoom operation, the image obtained at the first position or the second position is moved to the third position. You can freeze up to. It goes without saying that the predetermined positions are not limited to three.

Further, it is preferable that the control means stops the lens group in response to the interruption of the operation of the zoom switch, thereby obtaining the angle of view intended by the photographer (or the operator). .

If the stop position of the lens group is determined in advance, the structure of the digital camera can be further simplified.

Further, the control means displays an image on the display unit based on an image signal output from the image sensor when the lens group reaches a predetermined position.
This is preferable because the photographer can confirm the composition of the subject before photographing.

According to a third aspect of the present invention, there is provided a digital camera comprising: a photographing optical system having a plurality of lens groups; and an image pickup device for receiving an optical image formed through the photographing optical system and outputting an image signal. An image display mode for displaying an image while updating at a predetermined timing based on an image signal output from the image sensor, and an information display for displaying information based on information other than the image signal output from the image sensor With a display unit that can set the mode and power from a single drive source,
A driving unit for performing a driving for a focusing operation and a driving for a zoom operation by moving a lens group of the photographing optical system in an optical axis direction, and causing the driving unit to perform a driving for a zoom operation. When the image display mode is set on the display unit, the control unit switches to an information display mode in accordance with the operation of the zoom switch, so that the lens group is driven for a zoom operation. Then, even when the angle of view of the image displayed on the display unit does not change linearly during the zoom operation because the driving for the focusing operation is also performed, by not displaying the image on the display unit, Even if the photographer visually recognizes the display unit, it is possible to prevent the user from feeling uncomfortable.

Further, the control means causes the driving means to move the lens group of the photographing optical system in response to the operation of the zoom switch, and displays the information corresponding to the position of the lens group on the display. If the image is displayed on the section, the photographer can estimate the approximate angle of view from the displayed information even when the subject image is not displayed, which is useful for determining the composition of the subject. Here, the display of information according to the position of the lens group includes displaying the current position with respect to the zoom range with a bar, displaying a numerical value, displaying a ratio of an angle of view, and the like. But not limited to these.

Further, the control means preferably stops the lens group in response to the interruption of the operation of the zoom switch, so that the angle of view intended by the photographer (or the operator) can be obtained. .

If the stop position of the lens group is determined in advance, the structure of the digital camera can be further simplified.

Further, when the control unit switches the information display mode to the image display mode when the lens group is stopped, based on the image displayed on the display unit, the photographer can control the subject before shooting. This is preferable because the composition of the image can be confirmed.

According to a fourth aspect of the present invention, there is provided a digital camera comprising: a photographing optical system having a plurality of lens groups; and an image sensor for receiving an optical image formed through the photographing optical system and outputting an image signal. A display unit that displays an image while updating at a predetermined timing based on an image signal output from the imaging element; and a lens unit of the imaging optical system is moved in the optical axis direction by power from a single drive source. In response to an operation of the zoom switch, a driving unit for performing driving for a focusing operation and driving for a zoom operation, a zoom switch for causing the driving unit to perform a driving for a zoom operation. Updating the image display on the display unit until the driving unit starts moving the lens group of the photographing optical system, and after the lens group starts moving until the lens group stops. In addition, since the display unit has control means for displaying information corresponding to the position of the lens group, when the lens group is driven for a zoom operation, driving for a focusing operation is also performed. Even when the angle of view of the image displayed on the display unit does not change linearly during the zoom operation, the image is not displayed on the display unit. Can be held. In addition, even if the subject image is not displayed, the photographer can estimate the approximate angle of view from the displayed information, which is useful for determining the composition of the subject.

Further, the control means preferably stops the lens group in response to the interruption of the operation of the zoom switch, so that the angle of view intended by the photographer (or the operator) can be obtained. .

If the stop position of the lens group is determined in advance, the structure of the digital camera can be further simplified.

Further, after the lens group is stopped, the control means suspends the display of the information and restarts the updating of the image display on the display unit. It is preferable because it can be confirmed.

Also, if the information displayed on the display unit is a frame corresponding to the angle of view corresponding to the position of the lens group, the photographer can easily recognize the information and is convenient. Here, the frame corresponding to the angle of view corresponding to the position of the lens group refers to an image displayed at a position where the lens group is located based on an image signal output from the image sensor and a display screen. This means that the relationship between the frozen image and the frame superimposed on it is similar to the relationship.

According to a fifth aspect of the present invention, there is provided a digital camera comprising: a photographing optical system having a plurality of lens groups; and an image pickup device for receiving an optical image formed through the photographing optical system and outputting an image signal. A display unit that displays an image based on an image signal output from the image sensor, and a lens from the photographing optical system that is moved in the optical axis direction by power from a single drive source to perform a focusing operation. , A driving unit for performing driving for zooming, a zoom switch for causing the driving unit to perform driving for zooming, and the driving unit for performing the photographing in response to the operation of the zoom switch. Move the lens group of the optical system from the first position to the second position, and until the lens group reaches the second position.
A control unit that repeats displaying an image on the display unit while sequentially enlarging or reducing an image based on an image signal obtained by performing image processing on an image signal output from the image sensor when the lens group is at the first position. Has
When the lens group is driven for a zoom operation, a drive for a focusing operation is also performed, so even when the angle of view of an image displayed on the display unit does not change linearly during the zoom operation, By displaying an image to be displayed on the display unit in an enlarged or reduced manner by image processing, the image corresponding to the zoom position can be displayed on the display unit without causing a sense of incongruity even when the photographer is visually recognizing the display unit. Can be displayed properly.

[0027]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a camera according to an embodiment of the present invention will be described in detail with reference to the drawings. FIG. 1 is an external view showing an embodiment of a digital still camera 100 that is an example of a digital camera to which the present invention is applied.
FIG. 1A is a front perspective view of the digital still camera 100, and FIG. 1B is a rear perspective view.

In FIG. 1, a digital still camera 10
0, an imaging unit 24 for imaging the subject, an auxiliary light emitting unit 30 that emits auxiliary light to the subject, and an optical viewfinder 25 that allows the photographer to check the composition including the subject by looking into the subject. An image display unit 8 for displaying a photographed image and the like; an information display unit (so-called status LCD) 26 for displaying a photographing setting status and the like; and an operation SW (switch) 21 for setting and switching various functions. Further, a release switch 21a for performing a shutter release is provided on the upper surface of the digital still camera 100. The detailed description of each component will be described together with the description of the functional configuration described later. In the present embodiment, the optical finder 25 is the lens unit 1
And a different optical system.

FIG. 2 is a block diagram showing a functional configuration of the digital still camera 100. In FIG. 2, the digital still camera 100 is a lens unit 1 (shown as a single unit in the figure), which is a photographing optical system including at least a front lens group (first lens group) and a rear lens group (second lens group). , Aperture 2, imaging unit 24 including CCD 3, imaging circuit 4, A / D conversion circuit 5, memory 6, D / A conversion circuit 7, image display unit 8, recording memory 9, compression / decompression circuit 1.
0, CPU 11, TG 12, AE / AF processing circuit 13,
CCD driver 14, aperture drive motor 15, aperture drive motor drive circuit 16, optical system drive motor 17, optical system drive motor drive circuit 18, battery 19, EEPROM 20, operation switch including zoom switch ST which is a zoom switch
21, a flash light emitting section 22, an auxiliary light emitting section 30 as an auxiliary light emitting section (which can also be used as an auxiliary light emitting section for AF and a red-eye reduction lamp), and a switching circuit 23.
Although the lens unit 1 of the present embodiment has a first lens group and a second lens group, it goes without saying that more lens groups may be provided.

The imaging unit 24 includes a lens unit 1 for capturing an optical image of a subject, which will be described later, an aperture 2 for adjusting the amount of light transmitted through the lens unit 1 and adjusting the exposure, and forming an image on the optical path of the lens unit 1. CCD (Charge Co.) that photoelectrically converts the optical image of the subject
and an image signal (analog signal) that has been photoelectrically converted is output to the imaging circuit 4. That is, the imaging unit 24 has a function as an imaging unit.

The imaging circuit 4 performs various image processing such as sensitivity correction of an image signal input from the CCD 3 in synchronization with a timing signal input from the TG 12, generates a predetermined image signal, and performs A / D conversion. Output to the circuit 5. The A / D conversion circuit 5 converts the input image signal from an analog signal to a digital signal, and outputs image data to the memory 6 or the AE / AF processing circuit 13 according to an instruction from the CPU 11.

The memory 6 is constituted by a buffer memory or the like, and temporarily stores the input image signal. When receiving an image display instruction from the CPU 11, the memory 6
The image data instructed to display an image is output to the / A conversion circuit 7, and the D / A conversion circuit 7 converts the input image data into an analog signal and performs processing so as to adapt to the output display. Output display. On the other hand, the memory 6
When an image recording instruction is received from the CPU 11, the image data (for example, J
(In PEG format), and the compression / expansion circuit 10 outputs the input image data to the recording memory 9.

An image display unit (also called a display unit) 8 includes a TF
It is composed of a T (Thin Film Transistor) or the like, and outputs and displays an image signal input from the D / A conversion circuit 7. The display is not limited to the image, for example,
It may be a text screen such as a menu screen for selecting a function.

The recording memory 9 serving as a recording unit is a recording memory composed of a semiconductor memory or the like.
This is a recording medium having an image data recording area for recording image data input from 0. The recording memory 9 may be, for example, a built-in memory such as a flash memory, a removable memory card or a memory stick, or a magnetic disk such as a hard disk or a floppy (registered trademark) disk. It may be a recording medium or the like. That is, the recording memory 9 has a function as a recording unit.

When receiving an image reading instruction from the CPU 11, the recording memory 9 outputs the read image data to the compression / expansion circuit 10, and outputs the image data to the compression / expansion circuit 10.
Performs decompression processing of the input image data, and
Output to

The compression / expansion circuit 10 compresses the image data input from the memory 6 by a predetermined coding method, and the image data input from the recording memory 9 to display the read-instructed image data on the screen. And a decompression circuit for decoding and decompressing the image data. That is, the compression / expansion circuit 10 has a function as a compression unit.

CPU (Central Process)
ing Unit) 11 reads various application programs related to photography stored in the EEPROM 20 into a work area (not shown), executes various processes such as a photography process according to the programs, and displays the processing results on the image display unit 8 or The information is displayed on the information display unit 26.

The CPU 11 has a release switch 21a
The AE / AF processing circuit 13 is driven and controlled in accordance with the half-press of (FIG. 1), the exposure condition is determined from the obtained photometric value, and the lens unit 1 is driven to the in-focus position detected by the AF processing. Then, an exposure process is executed in response to the full depression of the release switch 21a, image processing and digital conversion are performed on the generated image signal, and temporarily stored in the memory 6,
The image data is compressed by the compression / expansion circuit 10 and output to the recording memory 9.

TG (Timing Generato)
r) 12 generates a predetermined timing signal and outputs it to the imaging circuit 4, the CPU 11, and the CCD driver 14.

An AE (Auto Exposure: automatic exposure control) / AF (Auto Focus: automatic focus control) processing circuit 13 performs an AE processing circuit for executing an AE process for detecting an appropriate exposure condition, and detects an in-focus position. AF
And an AF processing circuit for executing the processing.
Each process is performed on image data input from the A / D conversion circuit 5 in accordance with an instruction from the CPU 11.

In the AE processing, the AE processing circuit performs arithmetic processing such as cumulative addition on the input luminance value of one screen or a predetermined area in the screen, and determines an appropriate value at the time of actual exposure based on the processing result. Exposure conditions are calculated and output to the CPU 11. On the other hand, in the AF processing, the AF processing circuit calculates an AF evaluation value for one input screen or a predetermined area in the screen, and outputs the calculation result to the CPU 1.
Output to 1.

The AF evaluation value has such a characteristic that the larger the focus is, the larger the value is.
When a graph is created with the F evaluation value on the vertical axis, a mountain having a focal point at the top is formed. That is, the lens unit 1
By comparing the AF evaluation values obtained while moving, the peak of the mountain, that is, the focal point can be obtained. The operation of obtaining the AF evaluation value in this manner is called a search operation. The AF evaluation value is calculated by analyzing the frequency of image data for one input screen or a predetermined area in the screen. In the frequency analysis, a band-pass filter is configured as software, an integrated value of the image signal intensity passing through the band-pass filter is calculated, and the calculation result is set as an AF evaluation value. That is, the AF evaluation value is
This is contrast (difference between light and dark) information and is calculated by performing an operation for obtaining the intensity of a specific frequency included in the image.

Here, the AF processing by the CPU 11 and the AF processing circuit will be described. The CPU 11 controls the driving of the optical system driving motor driving circuit 18 as a driving means to gradually generate an image signal by the CCD 3 at each lens position while moving the second lens group of the lens unit 1. AE
The AF processing circuit 13 calculates an AF evaluation value for each image data input from the A / D conversion circuit 5, compares the calculated AF evaluation values, detects the lens position that is the maximum AF evaluation value as the focal point, Output.

Upon receiving an instruction from the CPU 11, the CCD driver 14 drives and controls the CCD 3 in synchronization with a timing signal input from the TG 12. Specifically, control of the charge accumulation time of the CCD 3 according to the exposure adjustment control is executed.

The iris drive motor drive circuit 16 includes a CPU 1
The drive of the aperture drive motor 15 is controlled in accordance with an instruction from 1, and the aperture drive motor 15 drives the aperture 2. Further, the optical system drive motor drive circuit 18 controls the drive of the optical system drive motor 17 according to an instruction from the CPU 11, and the lens unit 1 is driven by the drive force of the optical system drive motor 17, whereby the first lens unit 1 The first lens group and the second lens group move as described below.

The battery 19 is a digital still camera 100
And a power source for supplying power to each of the components, for example, a lithium battery or an alkaline dry battery.

An EEPROM (Electrically)
Erasable Programmable Re
The ad-only memory 20 stores various application programs, processing programs, and the like related to imaging by the digital still camera 100.

The operation switch (switch) 21 includes various operation switches such as a release switch 21a, a mode switch for switching functions, and a menu switch for selecting settings. When each switch is operated, a signal is generated and output to the CPU 11. Note that the release switch 2
Reference numeral 1a denotes a two-stage switch composed of a half-press release switch for starting AE and AF processing prior to a shooting operation, and a full-press release switch for starting actual exposure processing.

The flash light emitting section 22 is a light emitting section for emitting strobe light to the subject when the brightness of the surrounding environment detected at the time of photographing is insufficient. You.

Next, a configuration for achieving a zoom operation and a focusing operation by the step zoom method will be described. FIG. 3 is a schematic configuration diagram illustrating a lens barrel of the camera according to the present embodiment and a driving configuration thereof.

In FIG. 3, reference numeral 17 denotes an optical system drive motor driven and controlled by the CPU 11, 17a denotes a sun gear fixed to an output shaft of the optical system drive motor 17, and 41 denotes an output shaft of the optical system drive motor 17. A fixed pinion gear, 42 is a Focus pulse plate held so as to rotate coaxially with the optical system drive motor 17, and 43 is a photo that optically detects a slit of the Focus pulse plate 42 and outputs a pulse corresponding to the rotation of the motor. It is an interrupter.

Reference numeral 44 denotes a gear train for reducingly transmitting the power of the pinion gear 2 to the gear 45; 46, a reference pulse plate held so as to rotate coaxially with the gear 45;
Is a photo-interrupter that optically detects the slit and outputs a pulse corresponding to the rotation of the gear 45.

Reference numeral 50 denotes a lens barrel, and a fixed barrel 59,
A cam cylinder 57 rotatable around the optical axis by a driving force from a gear 62 in the fixed cylinder 59, and a first lens group 51 (single unit in the drawing) engaged with a cam groove formed in the cam cylinder 57, respectively. One lens is shown, but multiple lenses are acceptable.)
Group holder 56 for holding lens and second lens group 52
(A single lens is shown in the figure, but a plurality of lenses may be used). Needless to say, this embodiment can also be applied to a type having a multi-stage cam cylinder having a lens group for each of a plurality of cam cylinders having different diameters.

The fixed cylinder 59 and the cam cylinder 57 are helicoidally connected, and the cam cylinder 57 is composed of the large gear 17a and the small gear 62.
The rotation of the fixed cylinder 59 in the direction of the optical axis by receiving the power from the optical system drive motor 17 and rotating through the cam cylinder gear 57a (see FIG. 5). 1st group holder 56
And the second group holder 58 are engaged with a cam groove (not shown) formed on the peripheral surface of the cam cylinder 57, and the first lens group 51 and the second lens group 52 are rotated by rotation of the cam cylinder 57. Are driven in the optical axis direction according to the cam groove (or may be a helicoid groove). CP
U11 controls all camera control operations.

In the above configuration, the Focus pulse plate 42 is
Since the photo interrupter 43 is driven directly by the optical system drive motor 17, the photo interrupter 43 generates a Focus pulse (control pulse signal), which is a signal of a fine pitch, to generate a CP signal.
Input to U11.

On the other hand, the reference pulse plate 46 is connected to the gear train 44,
The photo interrupter 47 generates a reference pulse (reference pulse position), which is a signal having a coarse pitch, by being driven by the rotation of the motor decelerated by the gear 45 to generate a CPU signal.
Input to 11.

Next, drive control of the lens barrel 10 by the CPU 11 using the above-mentioned Focus pulse, reference pulse and absolute position signal will be described with reference to FIG.

In FIG. 4, T1 and T2 show the movement trajectories when the first lens group 51 and the second lens group 52 zoom from f = 35 mm to f = 90 mm while maintaining the relationship of the afocal position.

T3 is a moving locus of the second lens group 52 in the step zoom system when focusing is performed by extending one lens unit. FIG. 4 shows the locus T3 in a simplified manner, but the actual locus T3 is set to be different for each zoom position.

In this embodiment, by moving the first lens group 51 along the locus T1 and moving the second lens group 52 along the locus T3, f = 35 mm
(WIDE), f = 50 mm (MIDDLE1), f =
70 mm (MIDDLE2), f = 80 mm (MIDD
LE3) and five zoom positions of f = 90 mm (TELE) can be selectively set.

For example, when the photographing state is set to f = 50 mm by the zooming operation, first, the lens groups 51 and 52 are switched from the reference pulse switching point (the falling point in the present embodiment, but may be the rising point) P1. Also stops with the position P2 on the WIDE side as the standby position. And then C
The PU 11 detects the switching of P1 and counts a predetermined number of Focus pulses.
Stops at the standby position P2 and confirms it. And
The Focus pulse counter is reset according to this confirmation.

Here, such a standby position is similarly provided at each of the zoom positions, and by counting a predetermined number of Focus pulses from the switching of P1, the zoom group in which the lens groups 51 and 52 are selected. It can be confirmed that the vehicle has stopped without error at the standby position corresponding to the position.

Incidentally, as a method of moving the lens groups 51 and 52 to the standby position, Fo is applied from the point of time when the reference pulse is detected.
As a method of driving until the number of cus pulses reaches a predetermined number corresponding to the standby position, there is a method of driving by performing position detection based on a continuous signal. When the camera starts operating according to the photographing operation of the photographer, the distance and luminance of the subject are measured, and then the focusing drive is started.

At this time, based on the distance data, the number of Focus pulses to be driven (focusing target value) of the first lens group 51 from the detection of the reference pulse switching point P1 to be detected later is stored in the CPU 11. Called from memory.

When the lens groups 51 and 52 are moved from the standby position P2 to T
Moving toward the ELE side, the reference pulse switching point P1
Is detected, the Focus pulse is counted from the time of detection. Then, when the count number reaches the Focus pulse number called out from the memory first, stop control of the lens groups 51 and 52 is performed.

Since the optical system drive motor 17 is actually affected by inertia, the brake control of the optical system drive motor 17 is performed from a short time, and the count number becomes F.
When the number of ocus pulses is reached, the lens groups 51 and 52 are stopped. Thereafter, the CPU 11 controls the imaging in response to the full-press of the release switch SW21a.

When the imaging control ends, the CPU 11 resets the lens groups 51 and 52 to the original standby position P2. Here, the absolute position signal is detected again to confirm whether the lens groups 51 and 52 have returned to the standby position P2.

Here, using the optical system drive motor 17,
A mechanism for changing the angle of view of the optical finder 25 will be described. FIG. 5 is a schematic configuration diagram showing a mechanism for driving the taking lens and the lens group of the optical viewfinder 25 in the camera of the present embodiment.

As shown in FIG. 5, the optical system driving motor 17
The gear 62 is meshed with the output pinion gear (sun gear) 17a. The gear 62 meshes with a cam cylinder gear 57 a formed on the peripheral surface of the cam cylinder 57, and a gear train 63.
And the gear train 63 is connected to the finder zoom cam 7.
The second cam gear 72a meshes with the second cam gear 72a, and these are connected so as to transmit power. Cam grooves 72b and 72c are formed on the peripheral surface of the finder zoom cam 72, and the
Finder lens group 73, second finder lens group 74
Are engaged, and can be moved in the optical axis direction according to the rotation of the finder zoom cam 72.

The cam gear 72a and the finder zoom cam 72 are connected via an electromagnetic clutch mechanism 72d. The electromagnetic clutch mechanism 72d rotates the cam gear 72a and the finder zoom cam 72 integrally according to a signal from the CPU 11. The power transmission state is switched to one of a power transmission state in which the finder zoom cam 72 does not rotate even when the cam gear 72a rotates.

Here, when the zoom operation is performed under the control of the CPU 11, the power from the gear 62 is transmitted to the cam cylinder 57 and the finder zoom cam 72 by the electromagnetic clutch mechanism 72d being in the power transmission state. You. In other words, the lens groups 51 and 52 are
Are driven according to the cam diagram shown in FIG.
4 is driven.

In such a case, the zoom magnification of the lens unit 1 and the zoom magnification of the optical finder 25 change while always being coincident with each other by the rotation of the optical system drive motor 17. That is, the optical finder 25 has a variable power function. The shapes of the cam cylinder 57 and the finder zoom cam 72 and the number of teeth of each gear of the transmission mechanism 60 are set to appropriate values in view of this operation.

On the other hand, when the focusing operation is performed, the power from the gear 62 is transmitted only to the cam cylinder 57 and the finder zoom cam 72 does not rotate because the electromagnetic clutch mechanism 72d is in the power non-transmission state. .
In such a case, the lens groups 51 and 52 can be driven for the focusing operation via the cam cylinder 57, but the first finder lens group 73 and the second finder lens group 74 do not move in the optical axis direction, and accordingly. Even if the photographer is looking into the optical viewfinder 25. There is no discomfort.

FIG. 6 is a flowchart for explaining a photographing process executed by the digital still camera 100 to which the present invention is applied. In the present embodiment, a focusing operation is performed by so-called image plane AF. First, in step S101 of FIG. 6, if a power switch (not shown) is turned on, the CPU 11 proceeds to step S102 on the assumption that the shooting mode is set.
To set the image display mode (the photographer operates S
It is determined whether the setting can be made by operating W21). If it is determined that the image display mode is set, in step S103, the image signal is taken in via the CCD 3 and image processing is performed to obtain image data, regardless of the operation of the release switch 21a.
At 4, the image is displayed on the image display unit 8 (through image display).

Further, in step S105, the CPU 11
Is a pressing signal of the first-stage release switch 21a (S1
Signal) has been input. If the CPU 11 determines that the pressing signal (S1 signal) of the first-stage release switch 21a is not input, the CPU 11 proceeds to step S10.
At 6, it is determined whether or not the zoom switch ST has been turned on. If it is determined that the zoom switch ST has not been turned on, the CPU 11 returns the flow to step S103. Therefore, the CPU 11 newly acquires an image signal through the CCD 3, performs image processing to obtain image data, and based on the image data, proceeds to step S104. The image can be displayed on the image display unit 8. The time to execute this loop is approximately 1
/ 30 seconds, that is, unless the photographer operates the release switch 21a and the zoom switch ST, the image display is updated at an interval of about 1/30 second as a predetermined timing.

On the other hand, if it is determined in step S106 that the zoom switch ST has been turned on, the CPU 11
As described above, the driving for the zoom operation is performed in step S107 (the first lens group 51 and the second lens group 52, which are the lens groups of the imaging optical system, are moved in the optical axis direction). This zoom operation is continued until the zoom switch ST is turned off. Note that when the zoom switch ST is turned off, for example, when the zoom switch ST is moving from the wide position to the tele position,
MIDDLE1, MIDDLE2, MIDDLE of FIG.
3. At any position of the TELE, the lens groups 51 and 52
Stops. When determining that the zoom switch ST has been turned off in step S108, the CPU 11 returns the flow to step S103.

However, according to the zoom operation, the first lens group 51 and the second lens group 52 move in accordance with the cam diagram shown in FIG. If a through image is displayed below, the photographer who views the image display unit 8 may feel uncomfortable with the angle of view that does not change linearly unless some processing is performed. On the other hand, according to the present embodiment, C
In response to the ON operation of the zoom switch ST, the PU 11 suspends the display update of the image and sets the zoom switch S
Since the image captured in the memory 6 is kept displayed immediately before the T is turned on (the image is frozen), the displayed image is stationary even if the photographer stares at the image display unit 8. Therefore, the user does not feel uncomfortable with the change in the angle of view. However, when an information display such as "the image is stopped but the zoom operation is being performed" is displayed together with the image display unit 8, a more user-friendly camera can be provided. Further, the CPU 11 restarts the display update of the image in response to the zoom switch ST being turned off, so that the photographer can compose the subject before photographing through the image displayed on the image display unit 8. You can check. The present embodiment is particularly effective when a digital still camera is fixed on a tripod or the like and an image is shot using a self-timer.

When the composition of the subject is determined in this way,
The photographer can take a picture. Therefore, step S
At 105, the CPU 11 sets the first-stage release switch 2
If it is determined that the pressing signal (S1 signal) of the first stage 1a has been input, an appropriate exposure condition is determined in step S109 by performing AE processing. In step S110, a pressing signal (S2 signal) of the second-stage release switch 21a is determined. ) Is input. If it is determined that the pressing signal (S2 signal) of the second-stage release switch 21a has been input, the CPU 11
Performs focusing driving in step S111.

The focusing drive at this time is AE ·
The AF processing circuit 13 performs the processing by comparing the plurality of image data output from the CCD 3 to obtain the optimum focus position while moving the second lens group 52 of the lens unit 1 in a stepwise manner. Therefore, the angle of view of the subject image displayed on the image display unit 8 fluctuates during the focusing drive. For example, even with a single-lens reflex camera, the image in the viewfinder may not be visually recognized for a moment immediately after the release. For example, there is an advantage that the user feels that this is an operation indicating that the release is performed, and does not particularly feel uncomfortable. If the digital still camera 100 is provided with a so-called active distance measuring device or the like as distance measuring means, the focusing drive may be performed based on the output (information on the in-focus position).

Thereafter, in step S112, the CPU 11
Is obtained by taking an image signal through the CCD 3 and performing image processing to obtain image data.
At 3, the image data is recorded in the image storage memory 9. Here, the CPU 11 determines in step S11
In step 4, a so-called post image is stored as an image storage memory 9.
The image is displayed on the image display unit 8 based on the image data recorded in (1), that is, new image data. Thereafter, the flow returns to step S101.

On the other hand, if the image display mode is not set, an image that makes the photographer feel uncomfortable is not displayed on the image display unit 8, so the following processing may be performed. That is, if it is determined in step S102 that the image display mode is not set, the CPU 11 proceeds to step S11
At 5, it is determined whether or not the zoom switch ST has been turned on. If it is determined that the zoom switch ST has been turned on, the CPU 11 proceeds to step S1 as described above.
16, the driving for the zoom operation is continued until the zoom switch ST is turned off in S117, and if it is determined that the zoom switch ST is not turned on, the process proceeds to step S1.
At 18, a wait signal (S1 signal) for the first-stage release switch 21a is awaited.

If it is determined that the pressing signal (S1 signal) of the first-stage release switch 21a has been inputted, the process proceeds to step S.
At 119, an appropriate exposure condition is determined by performing AE processing,
In step S120, the second-stage release switch 21a
Wait for the pressing signal (S2 signal) to be input. If it is determined that the pressing signal (S2 signal) of the second-stage release switch 21a has been input, the CPU 11 proceeds to step S12.
In step S1, focusing driving is performed.
Then, an image signal is fetched via the CCD 3 and image processing is performed to obtain image data.
At 3, the image data is recorded in the image storage memory 9. Thereafter, the flow returns to step S101.

FIG. 7 is a flowchart illustrating a photographing process performed by the digital still camera 100 according to the second embodiment. This modified example also employs a so-called image plane AF.
Performs a focusing operation, and only different points from the flowchart shown in FIG. 6 will be described.

In step S106, the zoom switch ST
If the CPU 11 determines that has been turned on, the CPU 11 interrupts the display update of the image (freezes the image) and drives the zoom operation in step S107 as described above. Further, in step S130, the CPU 11 determines whether the first lens group 51 and the second lens group 52 have reached predetermined positions as lens groups. As the predetermined position, FIG.
MIDDLE1, MIDDLE2, MIDDLE shown in
Any one of the positions 3 is conceivable, but not limited thereto.

If the CPU 11 determines that the first lens group 51 and the second lens group 52 have reached predetermined positions, the CPU 11 proceeds to step S
At 131, regardless of the operation of the release switch 21a, an image signal is taken in through the CCD 3, image processing is performed, and image data is obtained.
In step 2, the image display unit 8 displays an image enlarged or reduced from the image displayed before the zoom operation.

On the other hand, when it is determined that the first lens group 51 and the second lens group 52 are not at the predetermined positions, the CPU 11 performs only the zoom operation. The above operation is performed by the zoom switch S
The process is continued until T is turned off (step S130).
To S108). Thereafter, processing is performed in steps similar to those in the flowchart of FIG. According to the present embodiment, the image display is updated stepwise in response to the first lens group 51 and the second lens group 52 reaching the predetermined positions during the zoom operation. The image display is updated even during the zoom operation without giving a sense of discomfort to the photographer who is performing the zoom operation.
This is particularly effective, for example, when aiming at a moving subject.

FIG. 8 is a flowchart illustrating a photographing process executed by the digital still camera 100 according to the third embodiment. FIG. 9 is a diagram showing the transition of the display mode of the image display unit 8. Also in the present embodiment, the focusing operation is performed by the so-called image plane AF. First, in step S201 of FIG. 8A, if a power switch (not shown) is turned on, it is assumed that the photographing mode is set, and the CPU 1
In step S202, it is determined whether the image display mode is set. If it is determined that the image display mode is set, in step S203, regardless of the operation of the release switch 21a, an image signal is taken in through the CCD 3 to perform image processing to obtain image data, and based on that, in step S204 The image is displayed on the image display unit 8. This is called a through image display.

Further, in step S205, the CPU 11
Is a pressing signal of the first-stage release switch 21a (S1
Signal) has been input. If the CPU 11 determines that the pressing signal (S1 signal) of the first-stage release switch 21a is not input, the CPU 11 proceeds to step S20.
At 6, it is determined whether or not the zoom switch ST has been turned on. If it is determined that the zoom switch ST has not been turned on, the CPU 11 returns the flow to step S203, so that a new image signal is taken in via the CCD 3, image processing is performed, and image data is acquired. The image can be displayed (updated) on the image display unit 8. At this stage, the image display unit 8
In FIG. 9, an image as shown in FIG. 9A is displayed.

On the other hand, if it is determined in step S206 that the zoom switch ST has been turned on, the CPU 11
As described above, driving for the zoom operation is performed in step S207. Further, the CPU 11 determines in step S20
At 8, the information display mode setting routine is executed. This means switching from the image display mode to the information display mode.

In the setting routine for setting the information display mode, the image display is interrupted in step S208a, and the first lens group 51 and the second lens group 52 are set in step S208b.
The wide position (W) and the tele position (T) are detected as information on the position of the lens in step S208c.
(Indicated by a single color or wallpaper as the background) indicating the position of the bar B (FIG. 8B)
reference). This zoom operation is continued until the zoom switch ST is turned off (step S20).
9), each time, the CPU 11 executes step S208b.
Then, the positions of the first lens group 51 and the second lens group 52 are detected, and information on the position of the lens is displayed in step S208c (see FIG. 8C). The photographer can turn off the zoom switch ST when he or she has reached a desired zoom position while viewing the displayed information.

When determining that the zoom switch ST has been turned off in step S209, the CPU 11 executes an image display mode setting routine in step S211. This means that the mode is switched from the information display mode to the image display mode. More specifically, the display of the information on the lens position is interrupted in step S211a of FIG. Thereafter, the CPU 11 proceeds to step S1
03, the update of the image display is resumed (FIG. 9).
(D)). Thus, the photographer can confirm the composition of the subject by actually viewing the image before photographing.

When the composition of the subject is determined in this way,
The photographer can take a picture. Therefore, step S
At 205, the CPU 11 determines that the first-stage release switch 2
If it is determined that the pressing signal (S1 signal) of the release switch 1a has been input, an appropriate exposure condition is determined in step S212 by performing AE processing, and in step S213, a pressing signal (S2 signal) of the second-stage release switch 21a. ) Is input. If it is determined that the pressing signal (S2 signal) of the second-stage release switch 21a has been input, the CPU 11
Performs focusing driving in step S214.

Thereafter, in step S215, the CPU 11
Is obtained by taking an image signal through the CCD 3 and performing image processing to obtain image data.
At 6, the image data is recorded in the image storage memory 9. Here, the CPU 11 determines in step S21
7, a so-called post image is stored as an image memory 9
The image is displayed on the image display unit 8 based on the image data recorded in (1), that is, new image data. Thereafter, the flow returns to step S101.

On the other hand, if it is determined in step S202 that the image display mode has not been set, the CPU 11
Performs the processing from step S218 to step S226, which corresponds to the processing from step S115 to step S123 shown in FIG. 6, and thus redundant description is omitted.

As a modification of the present embodiment, it is conceivable to superimpose information on the lens position on the image of the subject which is not updated. More specifically, a frozen image based on an image signal obtained immediately before the zoom switch ST is turned on is used as wallpaper, and information on the lens position is synthesized and displayed on the image display unit 8. In such a case, it is possible to estimate how much the angle of view changes with respect to the image of the subject on the wallpaper based on the information on the lens position updated along with the zoom operation, so that the zoom operation is ended at the desired angle of view. It is effective for

In such a case, as shown in FIG. 10, if the information on the lens position is indicated by a frame F1 (or F2), it becomes easier to grasp the change in the angle of view. Here, frame F1 (or F
2) is a frame corresponding to the angle of view corresponding to the position of the lens group. For example, when the zoom operation is completed in the state of the frame F1, the next image to be updated and displayed does not include the tree on the left side of the screen in FIG. 10, and when the zoom operation is completed in the state of the frame F2, the next update is performed. In the displayed image, FIG.
Will not be included. In any case, if the lens groups 51 and 52 stop, CC
The final subject image is displayed on the image display unit 8 by the image data based on the image signal obtained via D3, so that the photographer can confirm the composition and the like. In addition,
It is preferable that the frames F1 and F2 are not displayed at the same time, but only the frame corresponding to the right angle corresponding to the position of the lens group is displayed.

FIG. 11 is a flowchart illustrating a photographing process performed by the digital still camera 100 according to the fourth embodiment. Also in the present embodiment, the focusing operation is performed by the so-called image plane AF. First, in step S301 of FIG. 11, if a power switch (not shown) is turned on, the CPU 11 assumes that the shooting mode is set,
In step S302, it is determined whether the image display mode has been set. If it is determined that the image display mode is set, the release switch 21 is determined in step S303.
Regardless of the operation of “a”, an image signal is fetched via the CCD 3 to perform image processing to obtain image data, and based on the image data, an image is displayed on the image display unit 8 in step S304.

Further, in step S305, the CPU 11
Is a pressing signal of the first-stage release switch 21a (S1
Signal) has been input. If the CPU 11 determines that the pressing signal (S1 signal) of the first-stage release switch 21a is not input, the CPU 11 proceeds to step S30.
At 6, it is determined whether or not the zoom switch ST has been turned on. If it is determined that the zoom switch ST has not been turned on, the CPU 11 returns the flow to step S303. Therefore, the CPU 11 newly acquires an image signal via the CCD 3, performs image processing, obtains image data, and based on the image data, proceeds to step S304. The image can be displayed (updated) on the image display unit 8.

On the other hand, if it is determined in step S306 that the zoom switch ST has been turned on, the CPU 11
As described above, driving for the zoom operation is performed in step S307. Further, the CPU 11 determines in step S30
At 8, the image signal obtained immediately before the zoom switch ST is turned on and stored in the memory 6 is enlarged if the zoom operation is performed from the wide position to the tele position, and the zoom operation is performed at the tele position. Image processing (interpolation processing) so as to reduce the image if it is performed in the direction of the wide position from. Further, in step S309, an image is displayed based on the interpolated image. Note that the degree of interpolation in step S308 is determined by the first lens group 51 and the second lens group 5.
If the image is linearly formed in accordance with the position 2, the photographer can recognize the image as if an image enlarged or reduced by the zoom operation is displayed, so that the user does not feel uncomfortable. still,
Regarding the processing from step S311 to step S325, this corresponds to step S109 to step S325 shown in FIG.
Since this corresponds to the process of 123, a duplicate description will be omitted.

Although the present invention has been described with reference to the embodiments, it should be understood that the present invention should not be construed as being limited to the above embodiments, and that modifications and improvements can be made as appropriate. is there.

[0101]

According to the present invention, it is possible to provide a digital camera having a high-performance yet inexpensive and compact structure without giving a photographer an uncomfortable feeling based on a completely different idea from the conventional one.

[Brief description of the drawings]

FIG. 1 is an external view showing an embodiment of a digital still camera 100 which is an example of a camera to which the present invention is applied. FIG. 1A is a front perspective view of a digital still camera 100, and FIG. Is a rear perspective view.

FIG. 2 is a block diagram showing a functional configuration of the digital still camera 100.

FIG. 3 is a schematic configuration diagram showing a lens barrel of the camera according to the embodiment and a driving configuration thereof.

FIG. 4 is a cam diagram for achieving a zoom operation and a focus operation in the present embodiment.

FIG. 5 is a schematic configuration diagram showing a mechanism for driving a photographing lens and a lens group of an optical finder 25 in the camera of the present embodiment.

FIG. 6 is a digital still camera 100 to which the present invention is applied.
6 is a flowchart for explaining the photographing process executed in step S1.

FIG. 7 is a flowchart illustrating a photographing process performed by the digital still camera 100 according to the second embodiment.

FIG. 8 is a flowchart illustrating a photographing process performed by the digital still camera 100 according to the third embodiment.

FIG. 9 is a diagram showing a display mode of an image display unit 8;

FIG. 10 is a diagram showing a display mode of an image display unit 8;

FIG. 11 is a flowchart illustrating a photographing process performed by a digital still camera 100 according to a fourth embodiment.

[Explanation of symbols]

8 Image display section 11 CPU 17 Optical system drive motor 100 Digital Still Camera 51 First lens group of lens unit 52 Second lens group of lens unit

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) G03B 17/12 G03B 17/12 Z 17/18 17/18 Z H04N 5/232 H04N 5/232 AZ / / H04N 101: 00 101: 00 F term (reference) 2H044 DA01 DA02 DB02 DC02 DE01 DE08 2H101 DD42 2H102 BA15 BB01 5C022 AA13 AB23 AB36 AB66 AC03 AC12 AC13

Claims (19)

[Claims] 1. An imaging optical system having a plurality of lens groups, an imaging device that receives an optical image formed through the imaging optical system and outputs an image signal, and an image output from the imaging device. A display unit that displays an image while updating it at a predetermined timing based on an image signal; and moving a lens group of the photographing optical system in the optical axis direction by power from a single drive source to perform a focusing operation. , A driving unit for performing driving for zoom operation, a zoom switch for causing the driving unit to perform driving for zoom operation, and the photographing for the driving unit in response to the operation of the zoom switch. Control means for starting the movement of the lens group of the optical system, and suspending the updating of the image display on the display unit until the lens group stops after the lens group starts moving. Digital camera which is characterized. 2. The digital camera according to claim 1, wherein the control unit stops the lens group in response to the interruption of the operation of the zoom switch. 3. The digital camera according to claim 1, wherein a stop position of the lens group is determined in advance. 4. The digital camera according to claim 1, wherein the control unit restarts updating the image display on the display unit after the lens group stops. 5. An imaging optical system having a plurality of lens groups, an imaging device for receiving an optical image formed through the imaging optical system and outputting an image signal, and an image output from the imaging device. A display unit that displays an image based on an image signal; and a power from a single drive source, the lens group of the imaging optical system is moved in an optical axis direction, and a drive for a focusing operation and a zoom operation are performed. A driving unit for performing driving for zooming, a zoom switch for causing the driving unit to perform driving for a zoom operation, and moving the lens group of the photographing optical system to the driving unit in response to an operation of the zoom switch. And control means for interrupting updating of image display on the display unit until the lens group reaches a predetermined position after the lens group starts moving and the lens group starts moving. Mera. 6. The digital camera according to claim 1, wherein the control unit stops the lens group in response to the interruption of the operation of the zoom switch. 7. The digital camera according to claim 1, wherein a stop position of the lens group is determined in advance. 8. The apparatus according to claim 1, wherein the control unit displays an image on the display unit based on an image signal output from the image sensor when the lens group reaches a predetermined position. 8. The digital camera according to any one of 5 to 7. 9. An imaging optical system including a plurality of lens groups; an imaging device that receives an optical image formed through the imaging optical system and outputs an image signal; A display unit capable of setting an image display mode for displaying an image while updating at a predetermined timing based on an image signal, and an information display mode for displaying information based on information other than the image signal output from the image sensor. Driving means for moving a lens group of the photographing optical system in the optical axis direction by power from a single driving source to perform driving for a focusing operation and driving for a zoom operation; A zoom switch for causing the driving unit to perform driving for a zoom operation, and when an image display mode is set on the display unit,
Control means for switching to an information display mode in response to an operation of the zoom switch. 10. The control means causes the driving means to move a lens group of the photographing optical system in response to an operation of the zoom switch, and displays information corresponding to a position of the lens group on the display. The digital camera according to claim 9, wherein the digital camera is displayed on a unit. 11. The digital camera according to claim 9, wherein the control unit stops the lens group in response to the interruption of the operation of the zoom switch. 12. The digital camera according to claim 9, wherein a stop position of the lens group is determined in advance. 13. The digital still camera according to claim 9, wherein the control unit switches from the information display mode to the image display mode when the lens group stops. 14. An imaging optical system having a plurality of lens groups, an imaging device that receives an optical image formed through the imaging optical system and outputs an image signal, and an image output from the imaging device. A display unit that displays an image while updating it at a predetermined timing based on an image signal; and moving a lens group of the photographing optical system in the optical axis direction by power from a single drive source to perform a focusing operation. , A driving unit for performing driving for zoom operation, a zoom switch for causing the driving unit to perform driving for zoom operation, and the photographing for the driving unit in response to the operation of the zoom switch. After the movement of the lens group of the optical system is started, and after the lens group starts moving, the updating of the image display on the display unit is interrupted until the lens group stops, and the display unit Digital camera; and a control means for displaying information corresponding to the position of the lens group. 15. The digital camera according to claim 14, wherein the control unit stops the lens group in response to the interruption of the operation of the zoom switch. 16. The digital camera according to claim 14, wherein a stop position of the lens group is determined in advance. 17. The control unit according to claim 14, wherein after the lens group is stopped, the display of the information is interrupted and the updating of the image display on the display unit is restarted. Digital camera described in Crab. 18. The digital camera according to claim 14, wherein the information displayed on the display unit is a frame corresponding to an angle of view corresponding to a position of the lens group. . 19. An imaging optical system including a plurality of lens groups, an imaging device that receives an optical image formed through the imaging optical system, and outputs an image signal, and an image output from the imaging device. A display unit for displaying an image based on an image signal; and a power from a single drive source, the lens group of the imaging optical system is moved in an optical axis direction, and a drive for a focusing operation and a zoom operation are performed. A driving unit for performing driving for zooming, a zoom switch for causing the driving unit to perform driving for a zoom operation, and a lens group of the photographing optical system for the driving unit in response to an operation of the zoom switch. From the position to the second position, and until the lens group reaches the second position, performs image processing on an image signal output from the image sensor when the lens group is at the first position. Painting with Digital camera; and a control means repeating be displayed on the display unit while sequentially enlarged or reduced images based on the signal.