JP2001311868A - Binoculars with image pickup function and focusing method thereof - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide binoculars with an image pickup function equipped with an automatic focusing function for an observed image without adding an AF detection module extra. SOLUTION: The binoculars are provided with a pair of right and left binocular optical systems 50 including an objective lens 2 and an eyepiece 4, an image pickup device 60 picking up an image by taking in the light separately from the lens 2 and converting it into an electrical signal, and a focusing state detection circuit generating a signal showing the focusing state of the image picked up by the device 60 from the electrical signal. The optical system 50 and the device 60 respectively include movable lenses 2b and 5b for focusing. Both of the movable lenses 2b and 5b are driven according to output from the focusing state detection circuit.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to binoculars, and more particularly, to binoculars having an imaging function.

[0002]

2. Description of the Related Art In general, focus adjustment of binoculars is performed by manually rotating a focus adjustment ring by a user. However, binoculars equipped with an automatic focusing (AF) mechanism have also been proposed. For example, in Japanese Patent Publication No. 62-6205,
A configuration in which a part of light passing through an objective lens of binoculars is split into optical paths and guided to an AF detection mechanism to perform AF detection, and an AF detection lighting window is provided separately from the binocular objective lens to provide AF detection.
A configuration for detecting is disclosed.

[0003] In addition, binoculars are usually used for an observer to observe an object with the naked eye. In recent years, binoculars with an imaging function for recording and reproducing observation images have been proposed. For example, Japanese Patent No. 2624556 proposes a device having a configuration in which optical path splitting members are arranged in left and right optical paths of binoculars, respectively, and a part of light is guided to an imaging device.

[0004]

However, the binoculars equipped with the AF mechanism have a problem that the addition of the AF mechanism makes the binoculars more expensive than those having manual focus adjustment. In addition, in the case of a configuration in which the light path is divided for AF detection, the amount of light incident on the eyepiece is reduced, so that the binocular image becomes dark and the performance is deteriorated. Further, when a movable mirror is used as the optical path dividing mirror, the structure becomes complicated, and it is difficult to obtain high accuracy. In addition, in order to increase the amount of light incident on the eyepiece, a method in which only one optical path of the binocular objective lens is divided and used for AF detection may be considered, but a light amount difference occurs between the left and right eyepiece images.
In practice, the problem of eyestrain occurs.

In addition, the binoculars with an imaging function described in Japanese Patent No. 26224556 have a problem that the amount of light incident on the eyepiece is reduced because a part of the light incident on the objective lens is imaged.

An object of the present invention is to provide binoculars with an imaging function that realize an automatic focusing function of an observation image without separately adding an AF detection module.

[0007]

According to the present invention, there is provided the following binoculars having an imaging function.

That is, a pair of left and right binocular optical systems including an objective lens and an eyepiece lens, an image pickup device for taking in light separately from the objective lens, converting the light into an electric signal, and picking up an image; Having a focus state detection circuit that generates a signal indicating the focus state of the captured image,
The binocular optical system and the imaging device each include a movable lens that moves for focus adjustment, the movable lens of the binocular optical system and the movable lens of the imaging device,
Both are configured to move in accordance with the output of the focus state detection circuit, and are binoculars with an imaging function.

[0009]

Embodiments of the present invention will be described below with reference to the drawings.

The binoculars according to the present embodiment include a pair of left and right binocular optical systems for observing an object, and an image pickup device different from the binocular optical systems. In the binoculars of the present embodiment,
Focus detection is performed from the output of the binocular optical system, and an automatic focus adjustment (AF) mechanism that adjusts the focus of the binocular optical system and the imaging device by driving the movable lens of the binocular optical system and the imaging device based on the detection result. Realize.

The configuration of the binoculars of the present embodiment will be specifically described below.

As shown in FIG. 3, the binoculars according to the present embodiment have a main body 1 and a subunit 10 connected to the main body 1 via a cable 9. A binocular optical system 50 including a pair of left and right optical systems and an imaging device 60 are mounted on the main body 1. The binocular optical system 50 includes an objective lens 2, a Porro prism 3, and an eyepiece 4, which are respectively disposed on a pair of optical axes 51, 52 for the left and right eyes. The objective lens 2 includes a fixed lens 2a disposed on the observation target side.
And a movable lens 2b disposed on the eyepiece side. The focus of the binocular optical system 50 is adjusted by moving the movable lens 2b along the optical axes 51 and 52. On the other hand, the imaging device 60 has a configuration in which the imaging lens 5 and the CCD 6 are arranged on an optical axis 53 located between the optical axis 51 and the optical axis 52. The imaging lens 5 has a fixed imaging lens 5a disposed on the observation target side and a movable imaging lens 5b disposed on the CCD 6 side.
Is moved along the optical axis 53 so that the imaging device 6
Zero focus adjustment is performed.

The angle of view of the imaging device 60 is designed to be a field of view corresponding to the actual field of view of the binocular optical system 50. In order to realize this, the angle of view is adjusted in the optical design of the imaging lens 5 here. In addition to this method, CC
The angle of view can also be adjusted by image processing for processing the image captured in D6.

As shown in FIGS. 1 and 2, the binocular body 1 includes an objective lens barrel 70, left and right eyepiece lens barrels 71,
A housing 72 disposed between the left and right eyepiece-side barrels 71; The diopter adjustment ring 18 is attached to the eyepiece-side lens barrel 71. As shown in FIG. 3, the left and right objective lenses 2 of the binocular optical system 50 and the imaging device 60 are mounted on the objective lens barrel 70. In addition, the left and right eyepiece barrels 71
Is mounted with a Porro prism 3, and an eyepiece 4 is mounted on a diopter adjustment ring 18. Note that the left and right eyepiece-side barrels 71 correspond to the arrows 73 in FIGS.
Is configured to rotate in the direction of. in this way,
By rotating the eyepiece-side lens barrel 71, the distance between the left and right eyepieces 4 can be increased or decreased, so that the interpupillary distance can be adjusted. In addition, as described above, the eyepiece-side barrel 71
Is rotated, the eyepiece image is formed into an erect image without rotating.

Further, the diopter adjusting ring 18 includes a target rubber. The diopter adjustment ring 18 is configured to rotate in the direction of an arrow 74 in FIG. Move by an amount. Therefore, the diopter can be adjusted by rotating the diopter adjustment ring 18. Also,
The housing 72 has a power switch 7 and a recording switch 8
, And a signal processing circuit for automatic focus adjustment, image processing, and the like. These signal processing circuits will be described later in detail.

As shown in FIG. 3, the pair of left and right movable lenses 2b of the binocular optical system 50 and the movable imaging lens 5b of the imaging device 60 are both mounted on a movable lens holder 54. The movable lens holder 54 is configured to hold these three lenses simultaneously. The movable lens holder 54 is formed with two guide holes 55 whose axial directions are parallel to the optical axes 51, 52, 53. The shaft 61 is slidably fitted in each of the two guide holes 55. Both ends of the shaft 61 are fixed to the lens barrel 70 by a fixing member 62 also serving as a stopper. The movable lens holder 54 is formed with a screw hole 56 whose axial direction is parallel to the optical axes 51, 52, 53. A ball screw 57 is inserted into the screw hole 56 and meshes with the screw hole 56. A stepping motor 58 for rotating the ball screw 57 is connected to an end of the ball screw 57. The stepping motor 58 is fixed to the lens barrel 70. Therefore, when the stepping motor 58 is driven to rotate the ball screw 57, the screw hole 56 is sent along with the rotation, and the movable lens holder 54 moves along the axis 61 by a distance corresponding to the amount of rotation. . Thereby, the movable lens holder 54 is moved to the optical axes 51 and 5.
It can be moved in the directions of 2,53.

Therefore, the binocular optical system 50 and the imaging device 6
By moving the movable lens holder 54 to a position where 0 is simultaneously focused, the automatic focus adjustment of the binocular optical system 50 and the automatic focus adjustment of the imaging device 60 can be realized at the same time. The control of the movement amount of the movable lens holder 54 is performed by an AF control unit 33 and the like described later.

When the movable lens 2b and the imaging movable lens 5b are mounted on the movable lens holder 54 at the time of manufacture,
The mounting positions of the movable lens 2b and the imaging movable lens 5b on the movable lens holder 54 are adjusted so that the binocular optical system 50 and the imaging device 60 can be simultaneously focused. That is, the movable lens 2b and the imaging movable lens 5b are mounted at predetermined positions in the design on the movable lens holder 54,
The movable lens holder 54 is arranged at a designed focusing reference position. In this state, the reference chart arranged at the reference imaging distance from the binoculars is imaged by the imaging device 60, and the CCD 6 is moved and fixed to a position where the output of the CCD 6 is maximized. Next, the position of the movable lens 2b is finely adjusted on the movable lens holder 54 until the position of the left and right binocular optical systems 50 is focused while keeping the position of the movable lens holder 54 as it is. At this time, the diopter adjustment of the binocular optical system 50 is set to the 0 position. This fine adjustment is performed by adjusting the thickness of the spacer 63 for fixing the movable lens 2b to the movable lens holder 54 in the directions of the optical axes 51 and 52. Thereby, the imaging device 60
The position of the movable lens holder 54 for bringing the lens into focus and the position of the movable lens holder 54 for bringing the binocular optical system 50 into focus match. Accordingly, by moving the movable lens holder 54 to a position where the imaging device 60 is focused, a configuration is possible in which the binocular optical system 50 can be automatically focused simultaneously.

On the other hand, a liquid crystal monitor 11, a reproduction switch 12, a forward switch 1
3, a reverse switch 14 and an erase switch 15 are provided. These switches 12 to 15 are used when reproducing and erasing an image stored in the memory. An external memory 1 such as a flash memory for storing an image captured by the imaging device 60 is provided on a side surface of the subunit 10.
6 is provided with a slot 16a. In order to display an image on the liquid crystal monitor 11, a digital encoder 262 for modulating digital data into an analog video signal is arranged inside the subunit 10.

Next, a signal processing circuit mounted on the housing 72 of the binocular body 1 will be described with reference to FIG. This signal processing circuit includes an image processing unit 240 and an imaging / AF control unit 250 that performs imaging control and AF control. The housing 72 includes these signal processing circuits and CC
A power supply unit 900 for supplying power to the D6 and the stepping motor 58 is also mounted.

The image processing section 240, as shown in FIG.
A noise canceller 241 for removing noise included in the electric signal output from the CCD 6, an analog / digital converter (A / D converter) 242 for converting an analog image signal into a digital image signal, and various correction processing for the digital image signal Digital signal processor (DSP) 243 for performing compression and decompression, a compression / decompression circuit 244 for compressing and decompressing signals, a dynamic random access memory (DRAM) 245 for recording digital image signals before compression, and a static A random access memory (SRAM) 246;

The noise canceller 241 has a correlated double sampling function (CDS: CoS) for reducing a noise component of an electric signal (image signal) photoelectrically converted by the CCD 6.
rrelated Double Sampling) and an AGC function for controlling the gain. This noise canceller 24
1, noise reduction and gain control are performed. The A / D converter 242 converts the output of the noise canceller 241 into a digital video signal. The DSP 243
A circuit that performs data interpolation processing, gamma correction, knee correction, matrix correction, contour correction, and other correction processing on the digital image signal from the A / D converter, and then generates a luminance signal and color difference component data. is there.

The compression / expansion circuit 244 has a DCT (Discrete
It incorporates a Cosine Transform, an inverse DCT operation unit, a Huffman code, and a complex logic, and outputs a JPEG (Joint Photographic Experts G
roup) compression / expansion processing. Compression / expansion circuit 244
Has a writing function to the DRAM 245, a data access to the DRAM 245, and a refresh function, and stores the digital video signal before compression in the DRAM 245. SRAM
Reference numeral 246 denotes a buffer memory for temporarily storing a digital video signal compressed by the compression / expansion circuit 244 and having header information as a JPEG file as a recording video signal. This recording video signal is finally stored in the external memory 16 via the CPU 251. Also, the compression / expansion circuit 244
Is output from the digital encoder 26 of the subunit 10.
Also passed to 2. The digital encoder 262 is a circuit for modulating digital data into an analog video signal for display as described above, and the analog-modulated video signal is displayed on the liquid crystal monitor 261.

On the other hand, the imaging / AF control unit 250 has a CPU
251, high-frequency component extraction circuit 31, detection circuit 32, motor driver 34, timing generator (TG) 25
2. It has a vertical transfer drive circuit 253. The CPU 251 has an automatic focus (AF) of the binocular optical system 50 and the imaging device 60.
An AF control unit 33 for control is included.

The CPU 251 operates according to a program stored in a built-in program memory, thereby controlling automatic focus adjustment of the AF control unit 33, operation control of the CCD 6, operation control of the image processing unit 240, and output control of image signals. And implements the functions of controlling the writing of image signals to the recording medium, and accepts inputs from the operation switches 7, 8, 12 to 15, and the like.

AF control circuit 33, high frequency component extraction circuit 3
1. The detection circuit 32 and the motor driver 34 constitute a control circuit for automatic focus adjustment. These control the operation of the stepping motor 58 as shown in FIG.
This is a circuit for adjusting the focus of the binocular optical system 50 and the imaging device 60, and is entirely controlled by the CPU 251. This embodiment utilizes a feature that the amplitude of the high-frequency component of the video signal output from the CCD 6 is maximized in the focused state as shown in FIG. To perform automatic focus adjustment. This automatic focusing method is a method often used for an automatic focusing mechanism of a general video camera or the like.

Specifically, the high frequency component extraction circuit 31
The output signal of SP243 is received, and the high frequency component of the luminance signal is extracted from the output signal. The detection circuit 32 performs rectification detection on the output of the high-frequency component extraction circuit 31, and obtains an evaluation value required for AF. The AF control unit 33 takes in the evaluation value, calculates the amount of movement of the movable lens holder 54 to a position where the value is maximized, generates a control signal from the result, and outputs the control signal to the motor driver 34. Motor driver 34
Drives the stepping motor 58 according to a control signal from the AF control unit 33. At this time, the AF control unit 33 performs so-called “hill-climbing control” in which the moving amount is calculated so that the evaluation value takes the maximum value and the movable lens holder 54 is moved. In addition, the current movable lens holder 54
In order to check the direction of the focusing position from the position, the movable lens holder 54 is slightly vibrated, and the differential component dy / dx (where y is the evaluation value and x is the position of the movable lens holder 54) of the evaluation value obtained at that time is obtained. A method of estimating and determining the direction of the focus position based on the sign is used. Thus, control for focusing the imaging device 60 can be performed based on the output of the CCD 6. Accordingly, the movable lens 2b of the binocular optical system 50 mounted on the movable lens holder 54 also moves to the focusing position, so that the binocular optical system 50 can also be focused.

The timing generator (TG) 252 of the imaging / AF control section 250 is a circuit that generates a clock signal and various timing signals of the entire circuit. The vertical transfer circuit 253 controls the imaging of the CCD 6 by generating a vertical transfer pulse based on the clock signal generated by the TG and supplying the pulse to the CCD 6.

Further, the power supply unit 90 disposed in the housing 72
0 has a power supply circuit 910 and a battery 930. The power supply circuit 910 generates a predetermined voltage and supplies it to each circuit such as the image processing unit 240 and the imaging / AF control unit 250 and the CCD 6 and the stepping motor 58. Next, a method for using the binoculars according to the present embodiment The operation of each unit will be described.

Prior to use, the user adjusts the interpupillary distance. The interpupillary distance adjustment is performed by moving the eyepiece-side lens barrel 71 in the direction of the arrow 73 in FIGS. 1 and 2 as described above. In addition, the diopter adjustment ring 18 is rotated to adjust the diopter.

Next, the power switch 7 is depressed to turn on the power. Thereby, the CCD 6 of the imaging device 60 starts imaging, and the output signal is transmitted to the image processing unit 240 and the imaging / AF.
The processing is performed by the control unit 250, and the position of the movable lens holder 54 is controlled by the AF control unit 33. Therefore,
The imaging device 60 and the binocular optical system 50 are both controlled to be in focus.

Therefore, the light incident on the fixed lenses 2a of the left and right objective lenses 2 of the binocular optical system 50 is transmitted to the movable lens 2b placed at the in-focus position by the movable lens holder 54.
To form an enlarged image. This enlarged image is converted by the Porro prism 112 into an erect image. Therefore, the user can observe an enlarged image as ordinary binoculars by looking through the eyepiece lens 113 with both eyes.

The fixed imaging lens 5 of the imaging device 60
The light incident on a passes through the imaging movable lens 5b disposed at the in-focus position by the movable lens holder 54, thereby forming an enlarged image on the CCD 6. This enlarged image is C
The image is captured by the CD 6, processed by the respective circuits of the image processing unit 240 as described above, and displayed on the liquid crystal monitor 11 of the subunit 10. Therefore, the user can check the captured image by viewing the display image on the liquid crystal monitor 11.

At this time, since the angle of view of the imaging device 60 and the viewing angle of the binocular optical system 50 are configured to substantially match, an enlarged image substantially the same as the magnified image observed by the binocular optical system 50 Are imaged by the imaging device 60. Therefore, when the user wants to record an enlarged image observed by the binocular optical system 50, the recording switch 8 is pressed to
The PU 251 stores the recording video signal subjected to the image processing by the image processing circuit unit 240 in the external memory 16. Thereby, an image almost similar to the enlarged image observed by the binocular optical system 50 can be recorded. Note that the recording switch 8
Are the two eyepiece barrels 7 of the binocular body 1 as shown in FIG.
1, the user can press the recording switch 8 without taking his eyes off the eyepiece 4.
The user can also check the image before imaging on the liquid crystal monitor 11 of the subunit 10 as necessary.

When the user wants to reproduce the recorded image, he presses the reproduction switch 12 of the subunit 10. As a result, the CPU 251 reads out the video signal data stored in the external memory 16 and
Through the digital encoder 26 of the subunit 10
2, the video signal read from the external memory 16 is displayed on the liquid crystal monitor 11. When the user presses the forward switch 13, the CPU 25
1 reads out a video signal of an image one image ahead of the image currently being read out from the external memory 16 from the external memory 16 and causes the liquid crystal monitor 11 to display it. When the user presses the reverse switch 14, the CPU 251 reads from the external memory 16 a video signal of an image immediately preceding the image currently being read from the external memory 16 and displays the video signal on the liquid crystal monitor 11. . When the user presses the erase switch 15, the CPU 251
From the external memory 16.

As described above, the binoculars of the present embodiment have an imaging function, generate an automatic focusing signal from the output of the imaging device 60, and automatically control the imaging device 60 and the binocular optical system 50 at the same time. Adjust the focus. Therefore, it is possible to provide a binocular equipped with an automatic focusing mechanism without separately adding an automatic focusing mechanism to the binoculars. Also,
Since the binoculars of the present embodiment take in the imaging light from the imaging lens 5 different from the objective lens 2 of the binoculars, the amount of light incident on the eyepiece 4 of the binocular optical system 50 does not decrease, and the binoculars An optical path splitting mechanism for splitting the optical path of the optical system 50 is unnecessary. Therefore, there is an advantage that the observation image of the binoculars does not deteriorate while having the imaging function and the automatic focusing function.

In the binoculars of the above-described embodiment, since the movable lens 5b for imaging of the imaging device 60 and the movable lens 2b of the binocular optical system 50 are mounted on one movable lens holder 54, One stepping motor 58 can simultaneously focus the imaging optical system 60 and the binocular optical system 50. Further, only one AF control circuit system for controlling the stepping motor 58 is required, and the effect that the driving mechanism and the control circuit have a simple configuration can be obtained.

However, the binoculars of this embodiment are
The present invention is not limited to the configuration using one movable lens holder 54. For example, the movable lens 5b for imaging of the imaging device 60 and the movable lens 2b of the binocular optical system 50 may be mounted on separate lens holders, and each lens holder may be driven by two stepping motors. Control of the two stepping motors is performed by a control signal from one AF control unit 33. In the case of such a configuration, the imaging lens 5 of the imaging device 60
Even if the optical configuration of the objective lens 2 of the binocular optical system 50 is different from the optical configuration of the objective lens 2 and the moving amount of the movable lens 5b for imaging necessary for focusing is different from the moving amount of the movable lens 2b, two stepping motors are required. By previously setting the rotation speed ratio according to the movement amount ratio, the moving lenses 2b and 5b can be simultaneously moved to the in-focus position.

Further, in the present embodiment, the automatic focus adjustment system in which the movable lens holder 54 is moved by the stepping motor 58 is used, but a manual type focus mechanism can be realized. Specifically, the configuration is such that the stepping motor 58 is replaced with a rotation knob for manual rotation. In this configuration, the user rotates the rotation knob to move the movable lens holder 54 to the user's desired focusing state.
Can be observed and imaged in the user's favorite in-focus state. In this case, it is possible to adopt a configuration in which the AF control section 33, the wide-range component extraction circuit 31, and the detection circuit 32 are not provided at all and the focus position adjusting operation is performed only by the user's judgment. Further, an AF control unit 33, a high-frequency component extraction circuit 31, and a detection circuit 32 are provided, and a function of displaying the current in-focus state in the field of view of the liquid crystal monitor 11 or the eyepiece 4 is provided. It is also possible to configure so as to assist the matching operation.

Also, in the binoculars of the present embodiment, the configuration has been described in which the binocular body 1 and the subunit 10 such as a liquid crystal monitor are separate, but the liquid crystal monitor 11, the digital encoder 262, the operation switches 12, 13,1
Of course, it is possible to mount 4, 15 and the like on the main body 1 side. In the case of such an integrated configuration, the liquid crystal monitor 11 can be used as an electronic finder. Therefore,
It is also possible to observe with the liquid crystal monitor 11 away from the eyepiece lens 4, and it is possible to easily observe for a long time.

[0041]

As described above, according to the present invention,
It is possible to provide binoculars with an imaging function having an automatic focusing function of an observation image without separately adding an AF detection module.

[Brief description of the drawings]

FIG. 1 is a top view showing an appearance of a main body 1 of binoculars according to an embodiment of the present invention.

FIG. 2 is a front view of an object side of the binoculars main body of FIG. 1;

FIG. 3 is an explanatory diagram showing a configuration of an optical system of the binoculars and a subunit 10 according to the embodiment of the present invention.

FIG. 4 is a block diagram showing a configuration of a signal processing circuit of the binoculars according to the embodiment of the present invention.

FIG. 5 is a block diagram showing a configuration of a circuit for automatic focus adjustment control among signal processing circuits of the binoculars according to the embodiment of the present invention.

FIG. 6 is a graph showing the relationship between the amplitude of the high frequency component of the video signal and the position of the movable lens holder used in the automatic focusing control of the binoculars according to the embodiment of the present invention.

[Explanation of symbols]

1 ... body, 2 ... left and right objective lenses, 2a ... fixed lens,
2b: movable lens, 3: left and right porro prism, 4: left and right eyepieces, 5: imaging lens, 5a: imaging fixed lens, 5b: imaging movable lens, 6: CCD, 7: power switch, 8 ... Recording switch, 9 ... connection cable, 10
... Main body, 11 ... LCD monitor, 12 ... Playback switch, 13
... Forward switch, 14 Reverse switch, 15 Erase switch, 16 External memory, 18 Diopter adjustment ring, 31 High frequency component extraction circuit, 32 Detection circuit, 33 AF control unit,
34: motor driver, 50: left and right binocular optical systems, 54
... movable lens holder, 55 ... guide hole, 56 ... screw hole,
57: ball screw, 58: stepping motor, 60:
Imaging device, 61: shaft, 62: fixing member, 63: spacer, 240: image processing unit, 241: noise canceller,
242 ... A / D converter, 243 ... Digital signal processor (DSP), 244 ... Compression / decompression processing circuit,
245 DRAM, 246 SRAM, 250 imaging /
AF control unit, 251, CPU, 252, timing generator (TG), 253, vertical transfer circuit, 262, digital encoder, 900, power supply unit, 910, power supply circuit, 930, battery.

Continuation of the front page F term (reference) 2H039 AA05 AB13 AB14 AB22 AC04 2H044 CA08 CA10 2H051 AA12 BB00 CB07 CE02 CE08 FA48

Claims (5)

[Claims] 1. A pair of left and right binocular optical systems including an objective lens and an eyepiece, an image pickup device for taking light separately from the objective lens, converting the light into an electric signal, and picking up an image, and A focus state detection circuit that generates a signal indicating a focus state of the captured image, the binocular optical system and the imaging device each include a movable lens that moves for focus adjustment, The binoculars with an imaging function, wherein both the movable lens and the movable lens of the imaging device are configured to move according to an output of the focus state detection circuit. 2. The binoculars with an imaging function according to claim 1, wherein the movable lens of the binocular optical system and the movable lens of the imaging device are simultaneously held by one holding member, and the holding member includes A binocular with an imaging function, further comprising a drive unit for moving the holding member according to an output of a focus state detection circuit. 3. The binoculars with an imaging function according to claim 1, wherein the imaging device has an angle of view corresponding to a field of view of an image observed by the binocular optical system. binoculars. 4. A pair of left and right binocular optical systems including an objective lens and an eyepiece lens, and an imaging device for separately taking in light, converting light into an electric signal, and capturing an image, wherein the binocular optical system and The imaging device includes a movable lens for focus adjustment, and the movable lens of the binocular optical system and the movable lens of the imaging device are simultaneously held by one holding member. A binocular with an imaging function, wherein a driving mechanism for moving the holding member by an arbitrary amount is connected to simultaneously move the movable lens of the system and the movable lens of the imaging device. 5. Observing with a pair of left and right observation binocular optical systems, converting light into an electric signal by an imaging device different from the binocular optical system, and performing focus adjustment of the imaging device based on the electric signals. A focus adjustment method for binoculars with an imaging function.