JP5809936B2 - Imaging device - Google Patents

Description

  The present invention relates to an imaging apparatus, and more particularly to an imaging apparatus capable of simultaneously capturing a plurality of images having different angles of view.

2. Description of the Related Art Conventionally, imaging devices that can simultaneously capture a plurality of images are known. For example, Patent Document 1 discloses an imaging device that simultaneously captures images with different angles of view.
It is possible to simultaneously capture images such as concerts, presentations, and athletic events, and magnified images of the main subject.

  In the imaging apparatus disclosed in Patent Document 1, the imaging area of a single imaging device is divided into upper and lower parts, a single-focus wide-angle lens system corresponding to the upper imaging area, and the telephoto zoom corresponding to the lower imaging area. A lens system is arranged.

Two reflecting surfaces are arranged in each of the wide-angle lens system and the telephoto zoom lens system.
The telephoto zoom lens system is configured such that a part of the telephoto zoom lens system and the reflecting surface tilt and move so that the optical axis of the telephoto zoom lens system is aligned with the main subject. Furthermore, a configuration in which the tilt movement is performed also in the wide-angle lens system is disclosed.

  By detecting the target subject, the target subject is tracked and imaged by the telephoto zoom lens. It is also possible to perform tracking imaging of the main subject using the telephoto zoom lens system in conjunction with an operation for instructing the main subject in the imaging area using the wide-angle lens system.

JP 2010-141671 A

However, in the imaging apparatus disclosed in Patent Document 1, if the angle of view of the wide-angle lens system is to be increased, it interferes with the other optical system. For this reason, the angle of view is limited.
In addition, the angle of view of the two optical systems is always different, and there is a problem that a wide-angle stereo image cannot be obtained.
Further, since the F numbers of the two optical systems are different, an exposure difference occurs.
In addition, at least four reflecting surfaces are required, resulting in an increase in cost.
In addition, since the grip portion of the imaging device is far from the position of the imaging surface, it is difficult to reduce the size of the imaging device.
Also, the direction (orientation) of the other optical system cannot be controlled based on the focusing state of one optical system.
Further, when the main subject is located at a short distance, the tracking of the main subject in the telephoto zoom lens system may be shifted due to the parallax between the two optical systems.

The present reference example has been made in view of the above, and it is a first object to provide an imaging apparatus in which the optical path is not blocked by the zoom lens system even when the angle of view of the wide-angle lens system is increased. And
It is a second object of the present invention to provide an imaging apparatus that can make the angle of view of the zoom lens system and the wide-angle lens system substantially equal, obtain a plurality of wide-angle stereo images, and capture and display a wide-angle stereoscopic image. Objective.
It is a third object of the present invention to provide an imaging apparatus that can reduce the difference in F number between lens systems when a plurality of images are simultaneously captured and the occurrence of an exposure difference.
A fourth object is to provide a small imaging device at low cost.
It is a fifth object of the present invention to provide an imaging apparatus capable of controlling the orientation of the second imaging optical system based on the in-focus state of the first imaging optical system.
It is a sixth object of the present invention to provide an imaging apparatus that does not cause a shift in tracking of the main subject in the telephoto zoom lens system even when the main subject is located at a short distance.

In order to solve the above-mentioned problem and achieve the first object, according to the reference example ,
A first imaging optical system for forming a first image;
A second imaging optical system for forming a second image enlarged from the first image obtained by the first imaging optical system;
A first imaging optical system, a first image formed by the second imaging optical system, respectively, and a single imaging device that receives the second image and converts it into an electrical signal,
The first image and the second image are configured to be simultaneously imaged so that the imaging field angle by the first imaging optical system and the imaging field angle by the second imaging optical system are different from each other,
The second imaging optical system includes two reflecting members and a plurality of lens groups that are arranged between the two reflecting members and are movable in the optical axis direction. It is possible to provide an imaging apparatus capable of simultaneously capturing a plurality of images, which is a zoom lens system having no lens group moving in the optical axis direction.

  Thereby, even when the angle of view of the wide-angle lens system that is the second imaging optical system is increased, the optical path can be prevented from being blocked by the first imaging optical system, for example, the zoom lens system.

In order to achieve the second purpose, according to the reference example ,
A first imaging optical system for forming a first image;
A second imaging optical system for forming a second image enlarged from the first image obtained by the first imaging optical system;
A first imaging optical system, a first image formed by the second imaging optical system, respectively, and a single imaging device that receives the second image and converts it into an electrical signal,
The first image and the second image are configured to be simultaneously imaged so that the imaging field angle by the first imaging optical system and the imaging field angle by the second imaging optical system are different from each other,
The first imaging optical system is a single focal lens system,
The second imaging optical system is a zoom lens system including two reflecting members and a plurality of lens groups movable in the optical axis direction.
An imaging apparatus capable of simultaneously capturing a plurality of images characterized by satisfying the following conditional expression can be provided.
0.9 × f2w <f1 <0.45 × f2t (1)
However,
f2w is the focal length at the wide-angle end of the second imaging optical system,
f2t is a focal length at the telephoto end of the second imaging optical system,
f1 is the focal length of the first imaging optical system,
And
When the first imaging optical system and the second imaging optical system each have a focusing function, the value is in a state where the farthest distance is in focus.

  Thereby, the field angles of the first imaging optical system (wide-angle lens system) and the second imaging optical system (zoom lens system) can be made substantially the same. Thereby, a plurality of wide-angle stereo images can be obtained. Therefore, it is possible to display wide-angle stereoscopic image capturing.

In order to achieve the third purpose, according to the reference example ,
A first imaging optical system for forming a first image;
A second imaging optical system for forming a second image enlarged from the first image obtained by the first imaging optical system;
A first imaging optical system, a first image formed by the second imaging optical system, respectively, and a single imaging device that receives the second image and converts it into an electrical signal,
The first image and the second image are configured to be simultaneously imaged so that the imaging field angle by the first imaging optical system and the imaging field angle by the second imaging optical system are different from each other,
The first imaging optical system is a single-focus lens system having an aperture stop,
The second imaging optical system is a zoom lens system including two reflecting members and a plurality of lens groups movable in the optical axis direction.
When simultaneously capturing the first image and the second image, the aperture stop of the first imaging optical system is changed so that the F number of the first imaging optical system satisfies the following conditional expression It is possible to provide an imaging device capable of simultaneously capturing a plurality of images.
0.9 <Fno1 / Fno2 <1.1 (2)
However,
Fno1 is the F number of the first imaging optical system at the time of simultaneous imaging,
Fno2 is the F number of the second imaging optical system for simultaneous imaging,
It is.

  Thereby, the F numbers of the lens systems when a plurality of images are simultaneously captured can be made substantially the same. As a result, the exposure difference between the two imaging optical systems can be reduced.

In order to achieve the fourth purpose, according to the reference example ,
A first imaging optical system for forming a first image;
A second imaging optical system for forming a second image enlarged from the first image obtained by the first imaging optical system;
A first imaging optical system, a first image respectively formed by the second imaging optical system, and a single imaging device that receives the second image and converts it into an electrical signal,
The first image and the second image are configured to be simultaneously imaged so that the imaging field angle by the first imaging optical system and the imaging field angle by the second imaging optical system are different from each other,
The first imaging optical system is a lens system that does not have a reflecting surface that reflects the optical path,
The second imaging optical system is a zoom lens system including two reflecting members and a plurality of lens groups movable in the optical axis direction.
An imaging apparatus capable of simultaneously capturing a plurality of images, having a grip portion provided on the opposite side of the first imaging optical system to the side on which the second imaging optical system is disposed can be provided. .

  As a result, the number of reflecting surfaces may be less than at least four, so that the cost can be reduced. Even when the present invention is applied to a portable imaging device, it is not necessary to move the grip portion away from the imaging element, which is advantageous for downsizing the imaging device.

In order to achieve the fifth object, according to the present invention,
A first imaging optical system for forming a first image;
A second imaging optical system for forming a second image enlarged from the first image obtained by the first imaging optical system;
A first imaging optical system, a first image formed by the second imaging optical system, respectively, and a single imaging device that receives the second image and converts it into an electrical signal,
The first image and the second image are configured to be simultaneously imaged so that the imaging field angle by the first imaging optical system and the imaging field angle by the second imaging optical system are different from each other,
The first imaging optical system has a focusing lens group that moves during focusing,
Furthermore, the second imaging optical system is a zoom lens system,
Based on the subject side of the more the resulting distance information to the focusing-focus state of the first imaging optical system first imaging optical system has a control unit for controlling the second image capturing direction of the orientation of the imaging optical system An imaging apparatus capable of simultaneously capturing a plurality of images can be provided.

  Thereby, the direction of the second imaging optical system can be controlled based on the focusing state of the first imaging optical system.

In order to achieve the sixth object, according to the present invention,
A first imaging optical system for forming a first image;
A second imaging optical system for forming a second image enlarged from the first image obtained by the first imaging optical system;
A first imaging optical system, a first image formed by the second imaging optical system, respectively, and a single imaging device that receives the second image and converts it into an electrical signal,
The first image and the second image are configured to be simultaneously imaged so that the imaging field angle by the first imaging optical system and the imaging field angle by the second imaging optical system are different from each other,
The first imaging optical system has a focusing lens group that moves during focusing,
The second imaging optical system is a zoom lens system including two reflecting members and a plurality of lens groups movable in the optical axis direction, and has a focusing lens group that moves during focusing,
A plurality of images obtained by acquiring object distance information of an arbitrary region within the imaging range of the first imaging optical system by the second imaging optical system from the focusing state of the second optical system. An imaging device capable of simultaneously imaging can be provided.

  According to this, it is possible to obtain a stereoscopic image with a sense of presence even in a wide-angle image using the object distance information of each region in the wide-angle screen.

In order to achieve the seventh object, according to the present invention according to another aspect,
A first imaging optical system for forming a first image;
A second imaging optical system for forming a second image enlarged from the first image obtained by the first imaging optical system;
A first imaging optical system, a first imaging optical system formed by the second imaging optical system, and a single imaging device that receives the second image and converts it into an electrical signal,
The first image and the second image are configured to be simultaneously imaged so that the imaging field angle by the first imaging optical system and the imaging field angle by the second imaging optical system are different from each other,
The second imaging optical system is a zoom lens system including two reflecting members and a plurality of lens groups movable in the optical axis direction.
An imaging apparatus capable of simultaneously capturing a plurality of images, comprising: a distance information acquisition unit that acquires distance information of a subject based on a phase difference due to parallax between a first imaging optical system and a second imaging optical system Can be provided.

  According to this, it is possible to obtain a stereoscopic image with a sense of presence even in a wide-angle image using the object distance information of each region in the wide-angle screen.

  The imaging apparatus according to the present invention has an effect that it is possible to provide an imaging apparatus in which the optical path is not blocked by the zoom lens system even when the angle of view of the wide-angle lens system is increased.

It is a lens sectional view of an imaging optical system with which an imaging device of a 1st embodiment is provided. It is lens sectional drawing of the imaging optical system with which the imaging device of 2nd Embodiment is provided. It is a lens sectional view of an imaging optical system with which an imaging device of a 3rd embodiment is provided. It is a conceptual diagram explaining the procedure which scans a to-be-photographed object. (A) is a figure which shows the state which is image | photographing a to-be-photographed object. (B) is a diagram showing a state in which a part of the subject is enlarged and displayed. (C) is another figure which shows the state which is image | photographing a to-be-photographed object. (D) is a diagram showing a state in which a part of the subject is enlarged and displayed. It is a functional block diagram of an imaging device. It is another functional block diagram of an imaging device. It is a flowchart which shows the procedure which controls an imaging direction. It is a flowchart which shows the procedure which calculates | requires the distance information of a to-be-photographed object based on the phase difference of two imaging optical systems. It is a flowchart which shows the procedure which calculates | requires the distance information of a to-be-photographed object based on the image formation state of two imaging optical systems. It is the figure which looked at the digital camera which is an imaging device from the front. It is a front perspective view which shows the external appearance of the digital camera by this invention. It is a rear view of the digital camera of FIG. It is a cross-sectional view of the digital camera of FIG. FIG. 11 is a configuration block diagram of an internal circuit of a main part of the digital camera of FIG. It is a figure explaining the modification of the optical system of an image pick-up element vicinity. It is another figure explaining the modification of the optical system of an image pick-up element vicinity.

  The effects of the configuration of the imaging apparatus according to the present embodiment will be described. In addition, this invention is not limited by this embodiment. That is, in describing the embodiment, a lot of specific details are included for the purpose of illustration, but various variations and modifications may be added to these details without exceeding the scope of the present invention. Accordingly, the exemplary embodiments of the present invention described below are set forth without loss of generality or limitation to the claimed invention.

Hereinafter, embodiments of the present invention will be described with reference to the drawings. First, an imaging device according to an embodiment of the present invention will be described. The imaging device according to the embodiment includes an optical system and an electrical system. 1, 2, and 3 show lens cross-sectional configuration diagrams of Example 1, Example 2, and Example 3. FIG. Other drawings show functional blocks and electrical systems of the imaging apparatus.
In the following description, first, features of the imaging apparatus will be described with reference to the drawings as appropriate. Next, numerical examples of the optical systems of Example 1, Example 2, and Example 3 will be described in detail.

  First, FIG. 5 shows the configuration and operation of the optical system of the imaging apparatus according to the present embodiment. FIG. 5A shows a situation in which a subject (person) OBa that is a shooting target is running in the direction of arrow A on a road with an ascending slope. FIG. 5B shows an image on the image sensor formed by an optical system including first and second imaging optical systems described later.

  For example, an enlarged subject OBb is displayed in the upper half area 102a of the monitor 102 of the imaging apparatus, and an unexpanded subject OBa is displayed in the lower half area 102b.

An optical system for performing such imaging and display will be described. 1, 2, and 3 illustrate a lens cross-sectional configuration of an imaging optical system included in the imaging apparatus of the present embodiment.
The optical system includes a first imaging optical system LS1 that forms a first image OBa,
A second imaging optical system LS2 that forms a second image OBb that is larger than the first image OBa by the first imaging optical system LS1.

  The imaging optical system 100 according to Example 1 in FIG. 1, the imaging optical system 200 according to Example 2 in FIG. 2, and the imaging optical system 300 according to Example 3 in FIG. An entrance window 111 is fixed by a frame member 112 in common to the system LS1 and the second imaging optical system LS2.

In addition, a single imaging device (first imaging optical system LS1 and second imaging optical system LS2 receives a first image OBa and a second image OBb, respectively, and converts them into electrical signals ( An imaging surface (I) is provided.
Here, the same length of the image pickup element I in the long side direction is used for the first image pickup optical system LS1 and the second image pickup optical system LS2. This configuration is common in the following embodiments.

  Here, the first image OBa and the second image OBb can be simultaneously imaged so that the imaging angle of view by the first imaging optical system LS1 and the imaging angle of view by the second imaging optical system LS2 are different from each other. Has been.

  A modified example of the optical system having a reflection surface for dividing the image by the first imaging optical system LS1 and the image by the second imaging optical system LS on the imaging element I on the imaging element I will be described later. To do.

The second imaging optical system LS2 includes two reflecting members and a plurality of lens groups arranged between the two reflecting members and movable in the direction of the optical axis AX2, and the reflecting member (most disposed on the object side) The zoom lens system has no lens group that moves in the direction of the optical axis AX2 on the object side of the reflecting surface r1.
Numerical Example 1, Numerical Example 2, and Numerical Example 3 correspond to the fact that the second imaging optical system LS2 is a zoom lens system.

In the first embodiment, the two reflecting members in the second imaging optical system LS2 are the reflecting mirror r1 and the reflecting mirror r17 in order from the object side.
In Example 2, the two reflecting members in the second imaging optical system LS2 are, in order from the object side, a right-angle prism having an entrance surface r3 and an exit surface r4, and a right-angle prism having an entrance surface r24 and an exit surface r25. is there.
In Example 3, the two reflecting members in the second imaging optical system LS2 are the reflecting mirror r1 and the reflecting mirror r17 in order from the object side.

An optical system included in an imaging apparatus capable of simultaneously capturing a plurality of images can be configured as follows.
A first imaging optical system LS1 that forms a first image;
And a second imaging optical system LS2 that forms a second image that is larger than the first image obtained by the first imaging optical system LS1.
A first image formed by the first image pickup optical system LS1 and the second image pickup optical system LS2, and a single image pickup device (image pickup surface) I that receives the second image and converts it into an electric signal. Is provided.

The first image and the second image can be simultaneously captured so that the imaging field angle by the first imaging optical system LS1 and the imaging field angle by the second imaging optical system LS2 are different from each other.
Here, the first imaging optical system LS1 is a single-focus lens system.

  The first imaging optical system LS1 is a single-focus lens system in the first and second embodiments.

The second imaging optical system LS2 is a zoom lens system including two reflecting members and a plurality of lens groups movable in the optical axis direction, and it is desirable that the following conditional expression is satisfied.
0.9 × f2w <f1 <0.45 × f2t (1)
However,
f2w is the focal length at the wide-angle end of the second imaging optical system,
f2t is a focal length at the telephoto end of the second imaging optical system,
f1 is the focal length of the first imaging optical system,
And
When the first imaging optical system and the second imaging optical system each have a focusing function, the value is in a state where the farthest distance is in focus.

If the upper limit of conditional expression (1) is exceeded, it will be difficult to obtain a wide angle of view of the first imaging optical system that is a single focus.
If the lower limit of conditional expression (1) is not reached, the angle of view of the second imaging optical system that is a zoom lens system becomes wide. For this reason, the field angle difference between the first imaging optical system and the second optical system becomes large.

  By satisfying conditional expression (1), the field angle of the first imaging optical system (wide angle lens system) and the field angle of the second imaging optical system (zoom lens system) can be made substantially the same. Therefore, a plurality of wide-angle stereo images can be obtained. As a result, a wide-angle stereoscopic image can be captured and displayed.

(Control of exposure difference between two optical systems)
In addition, the optical system that the imaging device capable of simultaneously capturing a plurality of images has,
A first imaging optical system LS1 that forms a first image;
A second imaging optical system LS2 that forms a second image enlarged from the first image by the first imaging optical system LS1, and
A first image formed by each of the first imaging optical system LS1 and the second imaging optical system LS2, and a single imaging element (imaging surface) I that receives the second image and converts it into an electrical signal; ,have.

  The first image and the second image can be simultaneously captured so that the imaging field angle by the first imaging optical system LS1 and the imaging field angle by the second imaging optical system LS2 are different from each other.

The first imaging optical system LS is a single focal lens system having an aperture stop.
Here, the aperture stop S of the first imaging optical system LS having a single focal point in Example 1 is the r5 plane. In addition, the aperture stop S of the single-focus first imaging optical system LS of Example 2 is the r5 plane.

The second imaging optical system LS2 is a zoom lens system including two reflecting members and a plurality of lens groups movable in the optical axis direction.
The two reflecting members in Example 1 and Example 2 are as described above.

When the first image and the second image are simultaneously captured, the aperture stop S of the first imaging optical system LS1 has the following conditional expression when the F number of the first imaging optical system LS1 is Changed to satisfy.
0.9 <Fno1 / Fno2 <1.1 (2)
However,
Fno1 is the F number of the first imaging optical system LS1 at the time of simultaneous imaging,
Fno2 is the F number of the second imaging optical system LS2 at the time of simultaneous imaging,
It is.

Conditional expression (2) defines an appropriate ratio of the F numbers of the two imaging optical systems.
When the upper limit value of conditional expression (2) is exceeded and below the lower limit value, the difference in exposure becomes large, and overexposure and underexposure are likely to occur.
By satisfying conditional expression (2), the exposure difference can be reduced. In the two imaging optical systems, the exposure difference can be adjusted by adjusting the exposure time.

  In the imaging optical systems according to the first, second, and third embodiments, the shutter SH1 is disposed in the vicinity of the aperture stop S of the first imaging optical system LS1. In addition, the shutter SH2 is disposed in the vicinity of the aperture stop S of the second imaging optical system LS2. The shutters SH1 and SH2 are clearly shown in FIG. 1, and are not shown in FIGS.

  The CPU 605 that also functions as a shutter speed control unit that controls the shutter speed according to a control procedure described later controls the shutter speed independently in the first imaging optical system LS1 and the second imaging optical system LS2.

  Thus, as described above, even when the F number of the first imaging optical system LS1 is different from the F number of the second imaging optical system, the two shutter speeds are controlled to control the two imaging. The exposure can be made appropriate by the lens frame of the optical system.

  FIG. 6 shows a functional block diagram of the imaging apparatus of the present embodiment. In the following description of all functional block diagrams and flowcharts, for convenience, the first imaging optical system is appropriately referred to as “first (no) optical system”, and the second imaging optical system is referred to as “second ( ) Optical system.

In FIG. 6, the first optical system 601 (first imaging optical system LS1) forms a first image. The second optical system 602 forms a second image that is larger than the first image by the first optical system 601.
The image sensor 603 is a single image sensor that receives the first image formed by the first optical system 601 and the second optical system 602 and the second image and converts them into an electrical signal. The captured image is displayed on the display unit 606. The display unit 606 is a monitor, for example.

  The focus lens drive control unit 604 drives the focusing lens based on, for example, in-focus state information calculated by the CPU 605. Based on the focusing information from the first optical system 601, the focusing lens is driven.

  Here, the focusing can be performed as a whole extension in the first imaging optical system LS1. The focusing of the second imaging optical system LS2 is not limited to the most image side lens, and any lens may be driven.

  The user operation unit 607 and the mirror control unit 608 will be described later.

In addition, the imaging apparatus according to the embodiment
A first imaging optical system LS1 that forms a first image;
A second imaging optical system LS2 that forms a second image enlarged from the first image by the first imaging optical system LS1, and
A first image formed by each of the first imaging optical system LS1 and the second imaging optical system LS2, and a single imaging element (imaging surface) I that receives the second image and converts it into an electrical signal; ,have.
The first image and the second image can be simultaneously captured so that the imaging field angle by the first imaging optical system LS1 and the imaging field angle by the second imaging optical system LS2 are different from each other.
The first imaging optical system LS1 is a lens system that does not have a reflecting surface that reflects the optical path.
The second imaging optical system LS2 is a zoom lens system including two reflecting members and a plurality of lens groups movable in the direction of the optical axis AX2.
It is desirable to have a grip provided on the opposite side of the first imaging optical system LS1 from the side where the second imaging optical system LS2 is arranged.
This optical system corresponds to all of Example 1, Example 2, and Example 3 described later.

FIGS. 11A and 11B show a configuration of a digital camera 40 that is an example of the imaging apparatus according to the embodiment as viewed from the front. In FIG. 11A, the digital camera 40 has incident windows of two imaging optical systems LS1 and LS2 arranged in parallel in the horizontal direction of the drawing.
The digital camera 40 is formed with a grip 50 which is a grip portion provided on the opposite side of the first imaging optical system LS1 from the side where the second imaging optical system LS2 is disposed.

  Thus, the digital camera 40 can be reduced in size by providing the grip 50 in the vicinity of the first imaging optical system LS1, which is a straight-ahead lens system having no reflecting surface for reflecting the optical path.

Further, it is desirable that the first imaging optical system LS1 and the second imaging optical system LS2 have a common incident window.
In FIG. 11A, the digital camera 40 has incident windows of two imaging optical systems LS1 and LS2 arranged in parallel in the horizontal direction of the drawing. A transparent protective frame member 11 is provided in common for the two optical systems LS1 and LS2. The transparent protective member can be formed of glass, transparent resin, or the like.

  Further, as shown in FIG. 11B, a helical screw hole formed so as to surround both optical axes of the incident optical axis AX1 of the first imaging optical system LS1 and the incident optical axis AX2 of the second imaging optical system LS2. It can also be set as the structure with the part 11a.

  Thereby, when the user attaches the polarizing filter to the digital camera 40, the polarization direction of the polarizing filter can be made the same for the first imaging optical system LS1 and the second imaging optical system LS2.

(Control of orientation of second imaging optical system)
Next, a procedure for imaging and scanning a subject will be described.
The imaging device has the following configuration.
A first imaging optical system LS1 that forms a first image;
A second imaging optical system LS2 that forms a second image enlarged from the first image by the first imaging optical system LS1, and
A first image formed by each of the first imaging optical system LS1 and the second imaging optical system LS2, and a single imaging element (imaging surface) I that receives the second image and converts it into an electrical signal; ,have.

The first image and the second image can be simultaneously captured so that the imaging field angle by the first imaging optical system LS1 and the imaging field angle by the second imaging optical system LS2 are different from each other.
The first imaging optical system LS1 has a focusing lens group that moves during focusing.
Further, the second imaging optical system LS2 is a zoom lens system.
Based on the focusing state of the first imaging optical system LS1, the mirror control unit 110 (608) is configured to control the orientation of the second imaging optical system LS2.
The mirror control unit 110 is not limited to the reflection mirror, and controls the direction of an optical element such as a lens.

  FIG. 7 shows a functional block diagram of the imaging apparatus. In FIG. 7, the same parts as those in the functional block diagram shown in FIG. 6 are denoted by the same reference numerals, and redundant description is omitted.

  In the imaging device whose functional blocks are shown in FIG. 7, the user operates the 3D mode setting button 701 to select 3D mode and 2D mode imaging. Specifically, the 3D mode setting button 701 corresponds to the 3D setting button 51 in the front view of the digital camera 40 shown in FIGS. 11 (a) and 11 (b).

  A case where the user selects the 3D mode with the 3D mode setting button 701 will be described with reference to FIG. Of course, the mode may be selected by using a dial type touch panel instead of the buttons.

  The CPU 605 also has a function as an image processing unit. Further, the display unit 606 includes a touch panel function. Then, the user touches a desired portion of the subject image displayed on the display unit 606 using the touch panel. The CPU 605 controls the direction in which the second optical system 602 captures an image based on two pieces of information, focusing information from the first optical system 601 and subject information instructed via the touch panel.

Here, a configuration for changing the orientation of the second optical system 602 will be described.
For example, in Example 1 and Example 3 shown in FIGS. 1 and 3, respectively, the most object-side reflecting mirror r1 in the second imaging optical system LS2 is decentered due to a change in the optical axis direction on the subject side. It is an eccentric moving reflecting surface that moves.

  On the back surface of the reflecting mirror r1, at least three stepping motors ST are provided for enabling the reflecting surface to be tilted and shifted in three orthogonal axes. The mirror controller 110 drives the stepping motor ST based on a signal from the CPU 605 (FIG. 7) to move the reflecting mirror r1 eccentrically (tilt, shift).

  In the second imaging optical system LS2 in Embodiment 2 shown in FIG. 2, the most object-side optical element (lens) is an eccentrically moving lens that moves eccentrically in order to change the optical axis direction on the subject side.

  The lens closest to the subject is provided with at least three stepping motors ST for enabling the lens to be tilted and shifted in three orthogonal axes. The direction control unit 110 drives the stepping motor ST based on a signal from the CPU 605 (FIG. 7) to move the lens eccentrically (tilt, shift). In addition, the structure which decenters another lens may be sufficient.

The explanation will be continued. The CPU 605 that also functions as the distance information acquisition unit acquires distance information of the subject based on the focusing state of the first imaging optical system LS1.
The display unit 606 displays an image captured by the first imaging optical system LS1.
An operation unit (user operation unit) 607 (see FIG. 6) determines a main subject direction focused by the first imaging optical system LS1.
The mirror control unit (imaging direction control unit) 110 described above determines the imaging direction of the second imaging optical system LS2 based on the subject direction in the first imaging optical system LS1 and the distance information of the CPU 605 that is the distance information acquisition unit. Control by the configuration.

  FIG. 5C shows a wide-angle image captured by the first imaging optical system LS1. An adult OB1 and a child OB2 are displayed on the monitor 47 against a mountain background.

Here, the user operation unit 607 can be configured by a touch sensor arranged on the display side of the display unit 606.
As a result, the user can easily perform an operation.

The user observes the photographing area on the wide-angle side on the monitor 47, and selects the area to be close-up on the telephoto side, for example, the part of the child OB2 with the touch sensor.
The mirror control unit (imaging direction control unit) 110 configures the imaging direction of the second imaging optical system LS2 based on the subject direction in the first imaging optical system LS1 and the distance information of the CPU 605 that is the distance information acquisition unit. Control to child OB2.

  Accordingly, as shown in FIG. 5D, only the subject area on the telephoto side (child OB2) is displayed by the second imaging optical system LS2. As described above, the mode selection can also be performed by observing the imaging area on the wide-angle side and selecting the area to be close-up on the telephoto side with the touch sensor.

The above procedure will be described in more detail.
FIG. 8 is a flowchart showing the procedure.
In step S701, the monitor 47 displays the imaging range of the first optical system (first imaging optical system) LS1.
In step S <b> 702, the user designates the magnified area by touching the touch panel with a finger.
In step S703, based on the control signal from the mirror controller 608 (FIG. 7), for example, the reflection mirror r1 of the optical system of the embodiment shown in FIG. 1 is tilted and shifted by driving the stepping motor ST. Then, the optical axis AX2 of the second imaging optical system LS2 is directed toward the child OB2 that is the subject.

In step S704, focusing is performed at the point designated by the user by the first imaging optical system LS1. Then, the CPU 605 having a function of calculating object distance information calculates the subject distance.
In step S705, the second imaging optical system LS2 performs focusing at a point designated by the user.
In step S706, whether or not the difference between the subject distances acquired in the focusing focused state of the first imaging optical system LS1 and the focusing focused state of the second imaging optical system LS2 is within a specified numerical value. Is judged.

  If the determination result of step S706 is false (N0), the process proceeds to step S707. In step S707, a search is made for a subject distance within the imaging screen of the second imaging optical system LS2 that matches that calculated by the first imaging optical system LS1.

  If the determination result of step S707 is false (No), the process returns to step S702 and the above procedure is further continued. If the determination result in step S707 is true (Yes), in step S708, the rotation of the eccentricity such as shift and tilt of the reflection mirror r1 is finely adjusted. Then, the subject OB2 is positioned at the center of the screen.

  Following step S708, shooting is performed in step S706. In step S705, if the difference between the subject distances of the respective imaging optical systems is within the specified numerical value, shooting is performed in step S706.

As described above, the second imaging optical system LS2 includes the decentering optical element that moves eccentrically in order to change the direction of the optical axis on the subject side (the reflecting mirror r1 of the first and third embodiments, the most of the second embodiment). Subject side lens).
Based on the distance information of the CPU 605 (distance information acquisition unit), the mirror control unit (eccentric moving unit) 110 moves the eccentric moving optical element in order to control the imaging direction of the second imaging optical system LS2.
In the second embodiment, as described above, instead of the lens on the most object side, another lens may be controlled to be decentered.

Moreover, this imaging device can also be set as the following structures.
A first imaging optical system LS1 that forms a first image;
And a second imaging optical system LS2 that forms a second image that is larger than the first image by the first imaging optical system LS1.
A first image formed by the first image pickup optical system LS1 and the second image pickup optical system LS2, and a single image pickup element (image pickup surface) I that receives the second image and converts it into an electric signal. Have.

  The first image and the second image can be simultaneously captured so that the imaging field angle by the first imaging optical system LS1 and the imaging field angle by the second imaging optical system LS2 are different from each other. The first imaging optical system LS1 has a focusing lens group that moves during focusing.

  The second imaging optical system LS2 is a zoom lens system that includes two reflecting members and a plurality of lens groups that can move in the direction of the optical axis AX2, and includes a focusing lens group that moves during focusing. ing.

  Then, the object distance information of an arbitrary area within the imaging range of the first imaging optical system LS1 is acquired by the second imaging optical system LS2 from the focusing focused state of the second imaging optical system LS2. To do.

  Accordingly, the second imaging optical system LS2 can obtain more accurate, that is, finer distance information than the first imaging optical system LS. In other words, the field angle of the second imaging optical system LS2 is smaller than the field angle of the first imaging optical system LS1. For this reason, according to the second imaging optical system LS2, finer distance information to the subject can be obtained.

  FIG. 4 shows the concept of imaging and scanning performed by the imaging apparatus according to this configuration. The first imaging optical system LS1 captures a first image based on the focusing state. Here, an approximate subject distance can be obtained.

  The second imaging optical system LS2 performs distance measurement a plurality of times while moving the focus lens group at each scan position in the imaging screen. Then, a second image at that position is obtained. Next, the imaging position is moved in the direction indicated by the dotted line in the figure. Then, distance measurement (imaging) is performed a plurality of times at the next imaging position.

  Thereby, in a plurality of areas on one screen, it is possible to obtain detailed distance information to the subject, that is, information based on a shallow depth of field.

  Using the object distance information of each region in the wide-angle screen, a stereoscopic image with a sense of reality can be obtained even in a wide-angle image.

Moreover, the imaging device of this embodiment can be set as the following structures.
A first imaging optical system LS1 that forms a first image;
A second imaging optical system LS2 that forms a second image enlarged from the first image by the first imaging optical system LS1, and
A first imaging optical system LS1 and a single imaging element I formed by the second imaging optical system LS2 and receiving a first image and a second image, respectively, and converting them into electrical signals, ,
The first image and the second image can be simultaneously captured so that the imaging field angle by the first imaging optical system LS1 and the imaging field angle by the second imaging optical system LS2 are different from each other,
The second imaging optical system is a zoom lens system including two reflecting members and a plurality of lens groups movable in the optical axis direction.
It has a distance information acquisition unit that acquires distance information of a subject based on a phase difference due to parallax between the first imaging optical system LS1 and the second imaging optical system LS2.
The CPU 605 in FIG. 7 also functions as a distance information acquisition unit.

FIG. 9 is a flowchart illustrating a procedure for performing image processing (change of saturation) described later based on the phase difference. Hereinafter, description will be made with reference to the functional block diagram of FIG. 7 and FIG.
Consider a case where the user sets the 3D mode by operating the 3D mode setting button 701 (FIG. 7) in step S801.

  In this case, the focusing lens drive control unit 604 (FIG. 7) zooms the second imaging optical system LS2 so that the first imaging optical system LS1 and the second imaging optical system LS2 have substantially the same angle of view.

In step S802, the storage unit 704 stores the screen imaged by the first imaging optical system LS1.
In addition, the storage unit 704 stores the screen imaged by the second imaging optical system LS2 in step S803.

  In step S804, the CPU 605 acquires distance information of the subject based on the phase difference due to parallax as a distance information acquisition unit. The CPU 605 calculates, calculates, and analyzes subject distance information at each point on the screen.

  In step S805, the CPU 605 groups subjects into a prescribed number of steps according to the subject distance.

  Then, the CPU 605 controls an algorithm storage unit 702, which will be described later, and performs a saturation change process for each group and displays it. Details of the saturation change will be described later.

When selecting and operating a main subject from an image by a wide-angle lens system, the distance to the main subject is not considered. Therefore, when the main subject is located at a short distance, the tracking of the main subject in the telephoto zoom lens system is displaced due to the parallax between both lens systems.
On the other hand, in the procedure of this embodiment, this tracking shift can be reduced.

Next, a procedure for performing image processing by performing determination based on a focus state, that is, a focusing in-focus state will be described.
FIG. 10 is a flowchart showing a procedure for performing the focus status and image processing (saturation change) described later. Hereinafter, description will be made with reference to the functional block diagram of FIG. 7 and FIG.

In step S901, the second imaging optical system LS2 is zoomed to the telephoto side as compared with the first imaging optical system LS1.
In step S902, the storage unit 704 stores and stores information on the shooting screen of the first imaging optical system LS1.

  In step S903, the first imaging optical system LS1 is moved in the screen while being sequentially focused by the second imaging optical system LS2. Then, subject distance information in the screen by the first imaging optical system LS1 is acquired.

  In step S904, the distance information acquisition unit acquires distance information of the subject based on the phase difference due to parallax. The CPU 605 calculates, calculates, and analyzes subject distance information at each point on the screen.

  In step S905, the CPU 605 groups subjects into a prescribed number of steps according to the subject distance.

Then, the CPU 605 controls an algorithm storage unit 702, which will be described later, and performs a saturation change process for each group and displays it.
Details of the saturation change will be described later.

  Accordingly, a stereoscopic image having a sense of reality can be obtained even in a wide-angle image using the object distance information of each region in the wide-angle screen.

Further, as shown in FIG. 6, the imaging apparatus includes an algorithm storage unit 702 that stores an image generation algorithm.
The first image of the first image and the second image based on the distance information such as the subjects OB1 and OB2 acquired by the CPU 605 that is the distance information acquisition unit and the image generation algorithm stored in the algorithm storage unit 702. It is desirable to have a third image generation unit 703 that generates a third image using the second image.

  Thereby, the 3rd image which has a three-dimensional effect can be produced | generated based on two images with parallax.

Next, the above-described image generation algorithm will be described.
The image generation algorithm performs lightness and saturation processing for short-distance objects in the image. When a long-distance object and a short-distance object are mixed, image reconstruction is performed so that the brightness and saturation differences between the long-distance object and the short-distance object are enlarged according to the following conditional expressions.

0 ≦ V′−V <4 (3)
1 <C'-C <6 (4)
here,
V is the brightness difference between the distant view (distant object) and the close view (short object) of the acquired image expressed using the Munsell color system,
C is the saturation difference between the distant view and the near view of the acquired image expressed using the Munsell color system,
V ′ is the brightness difference of the reconstructed image,
C ′ is the saturation difference of the reconstructed image,
It is.

If the upper limit value of conditional expressions (3) and (4) is exceeded, the brightness difference and saturation difference will be emphasized too much, resulting in an unnatural image.
If the lower limit of conditional expressions (3) and (4) is not reached, the effect of image processing will be reduced.
By satisfying conditional expressions (3) and (4), it is possible to appropriately adjust the brightness difference and saturation difference of the main subject and obtain an image in which these are emphasized.

For example, consider a landscape where a person is present at a short distance, a private house is present at a medium distance, and a mountain is present at a long distance. In this case, as the distance from the user increases, processing for sequentially decreasing the saturation is performed. Saturation processing is not performed for people.
For distant “mountains”, C′−C = 4 and V′−V = 0,
For medium-range “private houses”, C′−C = 3 and V′−V = 0,
For “persons” in close range, V′−V = 2 and C′−C = 0,
It is desirable to perform the following process. As a result, compared to the case where image processing is not performed, after the image processing, the “person” is raised to the front, and an image with a sense of reality can be obtained.

further,
When the farthest object in the screen is in the range of 10 m to infinity, it is desirable to satisfy the following conditional expression (5).
0 ≦ (V′−V) / (C′−C) <1 (5)
Furthermore, when the farthest object in the screen is in the range of 0 m to 10 m, it is desirable to satisfy the following conditional expression (6).
0 ≦ (C′−C) / (V′−V) <1 (6)

Conditional expression (5) is an expression applied when importance is attached to saturation. Conditional expression (6) is an expression applied when importance is attached to lightness.
By satisfying the conditional expressions (5) and (6), the sense of perspective is further increased, and an image with a sense of reality can be obtained.

  Note that each of the above-described embodiments and conditional expressions is desirable for solving the problem even if a plurality of the conditional expressions are satisfied at the same time.

Further, the first imaging optical system LS1 is a zoom lens system that does not have a reflecting surface, has a zoom ratio smaller than that of the second imaging optical system, and has a smaller total number of lenses than the second imaging optical system LS2. It is desirable to be. Thereby, it can reduce in size.
In the third embodiment, the first imaging optical system LS1 is a zoom lens system.

  Further, it is desirable that the first imaging optical system LS1 is a single-focus lens system that does not have a reflecting surface and has a smaller total number of lenses than the second imaging optical system LS2. This configuration corresponds to the first and second embodiments. This is advantageous for further downsizing.

In addition, an image by the first imaging optical system LS1 and an image by the second imaging optical system LS2 can be captured independently. Furthermore, it is desirable that each image can be recorded independently.
As a result, the user can arbitrarily select a shooting variation.

  Further, it is desirable that the most object-side reflecting surface in the second imaging optical system LS2 is the eccentric moving reflecting surface r1 that moves eccentrically in order to change the direction of the optical axis AX2 on the subject side.

  Hereinafter, embodiments of an imaging optical system included in an imaging apparatus according to the present invention will be described in detail with reference to the drawings. Note that the present invention is not limited to the embodiments.

  Hereinafter, Examples 1, 2, and 3 of the imaging optical system will be described.

  The numerical data is data in a state where the subject is focused on an object at infinity. The unit of length of each numerical value is mm, and the unit of angle is ° (degree).

(First imaging optical system LS1: Example 1)
As shown in FIG. 1, in order from the object side, a positive meniscus lens having a convex surface facing the object side, a negative meniscus lens having a convex surface facing the object side, an aperture S, a shutter SH1, a biconcave negative lens, and both It consists of a cemented lens with a convex positive lens and a biconvex positive lens.

  Aspherical surfaces are used on both surfaces of the biconvex positive lens closest to the image plane.

(Second imaging optical system LS2 of Example 1)
As shown in FIG. 1, the reflective surface r1 is provided in order from the object side. Bend the light path 90 degrees.
The first lens group G1 includes a negative meniscus lens having a convex surface facing the object side, a negative meniscus lens having a convex surface facing the object side, and a positive meniscus lens having a convex surface facing the object side.
A shutter SH2 and an aperture S are arranged.
The second lens group G2 includes a biconvex positive lens, a biconcave negative lens, and a biconvex positive lens.
The third lens group G3 includes a negative meniscus lens having a convex surface directed toward the object side.
The reflecting surface r17 bends the optical path by 90 degrees.

  The aspherical surfaces are used for the four surfaces of the first lens group G1, the second negative meniscus lens from the object side, and the image side of the second lens group G2, both surfaces of the biconvex positive lens.

(First imaging optical system LS1: Example 2)
In the second and third embodiments, the description of the shutter is omitted because it overlaps with the first embodiment.
As shown in FIG. 2, in order from the object side, a positive meniscus lens having a convex surface facing the object side, a negative meniscus lens having a convex surface facing the object side, an aperture S, a biconcave negative lens, and a biconvex positive lens And a biconvex positive lens.

  Aspherical surfaces are used on both surfaces of the biconvex positive lens closest to the image plane.

(Second imaging optical system LS2 of Example 2)
As shown in FIG. 2, in order from the object side, the first lens group G1 includes a negative meniscus lens having a convex surface directed toward the object side, a right-angle prism, and a biconvex positive lens.
The second lens group G2 includes a biconcave negative lens, a snow image lens including a positive meniscus lens having a convex surface facing the image side, and a plano-concave negative lens having a plane surface facing the image side.
The third lens group includes a biconvex positive lens, a cemented lens of a biconvex positive lens and a biconcave negative lens, a negative meniscus lens having a convex surface on the object side, and a positive meniscus lens having a convex surface on the object side. A cemented lens.
Following the right angle prism, the fourth lens group has a biconvex positive lens.

  The aspherical surfaces of the biconvex positive lens in the first lens group G1, the double-sided negative concave lens on the object side of the second lens group G2, and the biconvex positive lens on the most object side in the third lens group G3. It is used for 8 surfaces, both surfaces and both surfaces of the fourth lens group G4.

  Note that the r10, r17, and r21 surfaces are adhesive layers.

(First imaging optical system LS1: Example 3)
As shown in FIG. 3, in order from the object side, a negative meniscus lens having a convex surface facing the object side, a positive meniscus lens having a convex surface facing the object side, an aperture S, and a positive meniscus lens having a convex surface facing the object side And a cemented lens of a negative meniscus lens having a convex surface facing the object side and a biconvex positive lens.

  The aspherical surface is used for two surfaces, the object-side surface of the positive meniscus lens immediately after the stop S and the image side surface of the biconvex positive lens.

(Second imaging optical system LS2 of Example 3)
As shown in FIG. 3, the reflective surface r1 is provided in order from the object side. As a result, the optical path is bent 90 degrees.
The first lens group G1 includes a negative meniscus lens having a convex surface facing the object side, a negative meniscus lens having a convex surface facing the object side, and a positive meniscus lens having a convex surface facing the object side.
The second lens group G2 includes a biconvex positive lens, a biconcave negative lens, and a biconvex positive lens.
The third lens group G3 includes a negative meniscus lens having a convex surface directed toward the object side.
The reflecting surface r17 bends the optical path by 90 degrees.

  The aspherical surfaces are used for the four surfaces of the first lens group G1, the second negative meniscus lens from the object side, and the image side of the second lens group G2, both surfaces of the biconvex positive lens.

Below, the numerical data of each said Example are shown. Symbols are the above, f is the focal length of the entire system, fb is the back focus, _FNO is the F number, r is the radius of curvature of each lens surface, d is the distance between the lens surfaces, nd is the d-line of each lens The refractive index, νd is the Abbe number of each lens. The total lens length described later is obtained by adding back focus to the distance from the lens front surface to the lens final surface. fb (back focus) represents the distance from the last lens surface to the paraxial image plane in terms of air.

  The aspherical shape is represented by the following formula, where x is an optical axis with the light traveling direction being positive, and y is a direction orthogonal to the optical axis.

x = (y ² / r) / [1+ {1- (K + 1) (y / r) ² } ^1/2 ]
+ A4 y ⁴ + A6 y ⁶ + A8 y ⁸ + A10y ¹⁰ + A12y ¹²
Where r is the paraxial radius of curvature, K is the conic coefficient, and A ₄ , A ₆ , A ₈ , A ₁₀ , and A ₁₂ are the fourth, sixth, eighth, tenth, and twelfth aspheric coefficients, respectively. . In the aspheric coefficient, “E−n” (n is an integer) indicates “10 ⁻ⁿ ”.

First imaging optical system (straight forward single focus system)
Numerical example 1
Unit mm

Surface data surface number rd nd νd
Object ∞ ∞
1 17.0643 2.8000 1.80610 33.27
2 36.4654 0.1300 1.
3 16.3558 0.9500 1.69680 55.53
4 7.9657 5.5691 1.
5 (Aperture) ∞ 7.6963 1.
6 -10.5840 0.8300 1.75520 27.51
7 84.6657 3.3600 1.69680 55.53
8 -16.6108 0.1500 1.
9 * 670.6095 4.2000 1.74250 49.30
10 * -13.7699 33.8239 1.
Image plane (imaging plane) ∞

Aspheric data 9th surface
K = -999.0134
A2 = 0.0000E + 00, A4 = -1.7520E-05, A6 = 5.9396E-08, A8 = -1.9307E-09, A10 = 1.1985E-12

10th page
K = -0.4098
A2 = 0.0000E + 00, A4 = 3.1377E-06, A6 = 2.1734E-08, A8 = -5.7979E-10, A10 = -1.2876E-11

Various data

Focal length 25.382
Fno. 2.875
Angle of view 24.303
Total length 59.509
fb 33.824

Second imaging optical system (bending zoom system)
Numerical example 1
Unit mm

Surface data surface number rd nd νd
Object ∞ ∞
1 ∞ 22.0000 1. (Folded surface)
2 67.7164 1.8000 1.77250 49.60
3 12.9945 3.4844 1.
4 * 15.0000 2.0000 1.52542 55.78
5 * 9.9617 5.0891 1.
6 25.8592 2.4125 1.84666 23.78
7 58.6155 Variable 1.
6 (Aperture) ∞ 0.5000 1.
9 13.1340 4.4192 1.51742 52.43
10 -39.7030 2.9320 1.
11 -18.8969 1.0000 1.80518 25.42
12 540.5722 7.8257 1.
13 * 17.1957 3.4707 1.49700 81.61
14 * -32.7020 Variable 1.
15 1181.6535 1.2000 1.77250 49.60
16 41.9912 Variable 1.
17 ∞ 18.7997 1. (Bending surface)
Image plane (imaging plane) ∞

Aspheric data 4th surface
K = 0.
A2 = 0.0000E + 00, A4 = -2.1136E-04, A6 = 8.1306E-07, A8 = -2.2480E-09, A10 = 0.0000E + 00

5th page
K = -0.8985
A2 = 0.0000E + 00, A4 = -2.5104E-04, A6 = 1.1309E-06, A8 = -3.9604E-09, A10 = 0.0000E + 00

13th page
K = 0.
A2 = 0.0000E + 00, A4 = -7.6968E-06, A6 = 4.5605E-07, A8 = -1.1002E-09, A10 = 0.0000E + 00

14th page
K = 0.
A2 = 0.0000E + 00, A4 = 1.0961E-04, A6 = 5.9330E-07, A8 = -6.9715E-10, A10 = 0.0000E + 00

Zoom data

Zoom ratio 1.698
Wide-angle telephoto focal length 24.240 41.159
Fno. 4.50 5.75
Angle of View 25.591 15.343
Total length 119.709 129.381
fb 18.800 18.799

d7 12.16146 1.49141
d14 2.82035 1.77404
d16 17.79443 39.18321

Fno control:
Fno. 4.5-5.75 of the second imaging optical system (folding system)

In order to make the Fno of the first imaging optical system (straight-ahead system) and the second imaging optical system (bending system) uniform, the aperture diameter of the straight-ahead system may be controlled according to the following table.

Straight line Fno. And aperture diameter
Fno aperture diameter φ
2.875 8.315
4.50 5.341 ← Wide
5.75 4.185 ← Tele

Value of conditional expression (1) f1 / f2w = 1.05
f1 / f2t = 0.62

First imaging optical system (straight forward single focus system)
Numerical example 2
Unit mm

Surface data surface number rd nd νd
Object ∞ ∞
1 14.1786 2.8000 1.80610 33.27
2 27.3797 0.1300 1.
3 12.4779 0.9500 1.78650 50.00
4 6.5043 4.2283 1.
5 (Aperture) ∞ 6.3661 1.
6 -15.5973 0.8300 1.76182 26.52
7 27.0852 3.3600 1.69680 55.53
8 -35.9998 0.1500 1.
9 * 356.6655 4.2000 1.74250 49.30
10 * -11.7828 33.8223 1.
Image plane (imaging plane) ∞

Aspheric data 9th surface
K = 233.0929
A2 = 0.0000E + 00, A4 = -2.9412E-05, A6 = -2.3456E-07, A8 = 7.1848E-09, A10 = -8.4208E-11

10th page
K = -0.3428
A2 = 0.0000E + 00, A4 = 2.0611E-06, A6 = -2.4195E-07, A8 = 3.9420E-09, A10 = -5.3603E-11

Various data

Focal length 25.501
Fno. 2.879
Angle of view 24.198
Total length 56.837
fb 33.822

Second imaging optical system (bending zoom system)

Numerical example 2
Unit mm

Surface data surface number rd nd νd
Object ∞ ∞
1 162.6448 2.0326 2.00069 25.46
2 29.9743 7.3462 1.
3 ∞ 23.7228 1.84666 23.78 (Prism)
4 ∞ 0.5807 1.
5 * 51.8917 8.1592 1.69253 53.03
6 * -35.9631 Variable 1.
7 * -41.5227 2.0326 1.74156 49.21
8 * 67.4860 1.9745 1.
9 -80.8114 5.1104 1.92286 20.88
10 -23.9754 0.0203 1.50648 46.20
11 -23.9754 1.4518 1.88300 40.76
12 ∞ Variable 1.
13 (Aperture) ∞ Variable 1.
14 * 19.7707 8.9432 1.49650 81.53
15 * -30.2316 0.5807 1.
16 40.6568 8.7690 1.49700 81.54
17 -40.6568 0.0203 1.56384 60.67
18 -40.6568 1.4518 1.58144 40.75
19 449.5976 1.7132 1.
20 89.0229 1.4518 1.90366 31.32
21 11.9224 0.0203 1.56384 60.67
22 11.9224 5.7492 1.48749 70.23
23 15.9584 Variable 1.
24 ∞ 16.2000 1.77250 49.60 (Prism)
25 ∞ 1.5078 1.
26 * 40.6923 6.2138 1.53071 55.60
27 * -116.0192 13.2743 1.
Image plane (imaging plane) ∞

Aspheric data 5th surface
K = 0.
A2 = 0.0000E + 00, A4 = 5.2094E-09, A6 = -7.0776E-09, A8 = 4.3022E-11, A10 = -1.8550E-13

6th page
K = 0.
A2 = 0.0000E + 00, A4 = 6.1465E-06, A6 = -8.6496E-09, A8 = 4.7665E-11, A10 = -1.7716E-13

7th page
K = 0.
A2 = 0.0000E + 00, A4 = -1.3944E-05, A6 = 1.0997E-07, A8 = -4.0085E-10, A10 = 9.4142E-14

8th page
K = 0.
A2 = 0.0000E + 00, A4 = -2.4522E-05, A6 = 1.7454E-07, A8 = -7.5388E-10, A10 = 4.7361E-16

14th page
K = 0.
A2 = 0.0000E + 00, A4 = -2.5033E-05, A6 = 1.2610E-08, A8 = -2.4751E-10, A10 = -4.3206E-14

15th page
K = 0.
A2 = 0.0000E + 00, A4 = 1.4591E-05, A6 = 9.5752E-09, A8 = -1.7653E-10, A10 = 0.0000E + 00

26th page
K = 0.
A2 = 0.0000E + 00, A4 = 1.1856E-05, A6 = 2.1827E-08, A8 = -8.2181E-10, A10 = 5.8275E-13

27th page
K = 0.
A2 = 0.0000E + 00, A4 = 1.6738E-05, A6 = -1.6355E-08, A8 = -9.4204E-10, A10 = 1.1396E-12

Zoom data

Zoom ratio 2.784

Wide angle Medium telephoto focal length 25.515 31.423 71.028
Fno. 5.009 5.278 6.019
Angle of View 22.944 18.604 8.655
Total length 160.322 160.335 160.366
fb 13.274 13.707 14.507

d6 10.24330 14.27439 22.98933
d12 15.51960 11.49091 2.75846
d13 19.87540 18.14356 2.75846
d23 3.41770 4.72720 19.36020


Fno control:
Second imaging optical system (bending system) Fno 5.009 to 5.278 to 6.019

In order to make the Fno of the first imaging optical system (straight-ahead system) and the second imaging optical system (bending system) uniform, the aperture diameter of the straight-ahead system may be controlled according to the following table.

Straight running Fno and aperture
Fno aperture diameter φ
2.879 8.138
5.009 4.729 ← Wide
5.278 4.490 ← Std
6.019 3.942 ← Tele

Value of conditional expression (1) f1 / f2w = 0.999
f1 / f2t = 0.359

1st imaging optical system (zoom linear system)
Numerical Example 3
Unit mm

Surface data surface number rd nd νd
Object ∞ ∞
1 39.6598 1.7513 1.80610 40.74
2 * 4.8555 2.3351 1.
3 8.8835 2.4810 1.84666 23.78
4 18.8660 Variable 1.
5 (Aperture) ∞ 0. 1.
6 * 6.3558 2.6270 1.74330 49.33
7 72.9712 1.2405 1.84666 23.78
8 7.3891 4.0134 1.51633 64.14
9 * -29.2264 Variable 1.
Image plane (imaging plane) ∞

Aspheric data 2nd surface
K = -3.2020
A2 = 0.0000E + 00, A4 = 2.8760E-03, A6 = -9.2890E-05, A8 = 3.2053E-06, A10 = -5.1273E-08

6th page
K = -4.1320
A2 = 0.0000E + 00, A4 = 1.8723E-03, A6 = -6.0718E-05, A8 = 3.7797E-06, A10 = -1.5249E-07
A12 = -1.5632E-09, A14 = 0.0000E + 00, A16 = 0.0000E + 00, A18 = 0.0000E + 00, A20 = 0.0000E + 00

9th page
K = 0.
A2 = 0.0000E + 00, A4 = 1.5281E-03, A6 = -1.2234E-05, A8 = 9.3606E-06, A10 = -2.8400E-07


Zoom data

Zoom ratio 1.943
Wide angle Medium telephoto focal length 8.637 11.968 16.779
Fno.3.584 4.161 5.004
Angle of view 33.610 25.167 18.368
Total length 36.415 34.716 35.371
fb 12.627 15.364 19.317

d4 9.34030 4.90365 1.60535
d9 12.62659 15.36391 19.31735

Second imaging optical system (bending zoom system)
Numerical Example 3
Unit mm

Surface number rd nd νd
Object ∞ ∞
1 ∞ 10.0000 1. (Bending surface)
2 33.8582 0.9000 1.77250 49.60
3 6.4972 1.7422 1.
4 * 7.5000 1.0000 1.52542 55.78
5 * 4.9808 2.5445 1.
6 12.9296 1.2063 1.84666 23.78
7 29.3078 Variable 1.
8 (Aperture) ∞ 0.2500 1.
9 6.5670 2.2096 1.51742 52.43
10 -19.8515 1.4660 1.
11 -9.4484 0.5000 1.80518 25.42
12 270.2861 3.9128 1.
13 * 8.5979 1.7354 1.49700 81.61
14 * -16.3510 Variable 1.
15 590.8268 0.6000 1.77250 49.60
16 20.9956 Variable 1. (Bending surface)
17 ∞ 9.3999 1.
Image plane (imaging plane) ∞

Aspheric data 4th surface
K = 0.
A2 = 0.0000E + 00, A4 = -1.6909E-03, A6 = 2.6018E-05, A8 = -2.8775E-07, A10 = 0.0000E + 00

5th page
K = -0.8985
A2 = 0.0000E + 00, A4 = -2.0083E-03, A6 = 3.6188E-05, A8 = -5.0693E-07, A10 = 0.0000E + 00

13th page
K = 0.
A2 = 0.0000E + 00, A4 = -6.1575E-05, A6 = 1.4594E-05, A8 = -1.4083E-07, A10 = 0.0000E + 00

14th page
K = 0.
A2 = 0.0000E + 00, A4 = 8.7690E-04, A6 = 1.8986E-05, A8 = -8.9235E-08, A10 = 0.0000E + 00


Zoom data

Zoom ratio 2.383

Wide angle Medium telephoto focal length 8.637 12.120 20.580
Fno. 3.911 4.501 5.751
Angle of view 33.611 25.591 15.343
Total length 55.091 53.855 58.691
fb 9.400 9.400 9.400

d7 11.37968 6.08073 0.74571
d14 1.63792 1.41017 0.88702
d16 4.60655 8.89721 19.59161

(Digital camera)
12 to 15 are conceptual diagrams of the configuration of an imaging apparatus incorporating a plurality of zoom lenses according to the above-described embodiments. 12 is a front perspective view showing the appearance of the digital camera 40, FIG. 13 is a rear view thereof, and FIG. 14 is a schematic cross-sectional view showing the configuration of the digital camera 40.

  FIG. 12 is a front perspective view of a digital camera 40 including two optical systems, a first imaging optical system and a second imaging optical system.

  In this example, the digital camera 40 includes a photographic optical system 41 positioned on the photographic optical path 42, a finder optical system 43 positioned on the finder optical path 44, a shutter button 45, a pop-up flash 46, a liquid crystal display monitor 47, and the like. In addition, when a shutter button 45 disposed on the upper portion of the camera 40 is pressed, photographing is performed through the photographing optical system 41, for example, the lens of the first embodiment, in conjunction therewith. The object image formed by the photographing optical system 41 is formed on the image pickup surface (photoelectric conversion surface) of the CCD 49 as an image pickup element provided in the vicinity of the image formation surface via the cover glass C. The object image received by the CCD 49 is displayed as an electronic image on a liquid crystal display monitor 47 provided on the rear surface of the camera or a finder image display element via the CPU 605 (processing means). Further, a recording means is connected to the CPU 605 (processing means) so that a photographed electronic image can be recorded.

  The recording means may be provided separately from the CPU 605 (processing means), or may be configured to perform recording and writing electronically using a memory card, MO, or the like.

  Further, a finder eyepiece is disposed on the finder optical path 44. The object image displayed on the finder image display element is magnified by the finder eyepiece lens 59, adjusted to a diopter that is easy for the observer to see, and guided to the observer eyeball E. A cover member is disposed on the exit side of the finder eyepiece.

  FIG. 15 is a block diagram of the internal circuit of the main part of the digital camera 40. In the following description, the processing unit 51 includes, for example, the CDS / ADC unit 24, the primary storage memory 17, the image processing unit 18, and the storage unit 52 includes the storage medium unit 19, for example.

  As shown in FIG. 15, the digital camera 40 is connected to the operation unit 12, the control unit 13 connected to the operation unit 12, and the control signal output port of the control unit 13 via buses 14 and 15. An imaging drive circuit 16, a primary storage memory 17, an image processing unit 18, a storage medium unit 19, a display unit 20, and a setting information storage memory unit 21 are provided.

  The primary storage memory 17, the image processing unit 18, the storage medium unit 19, the display unit 20, and the setting information storage memory unit 21 are configured so that data can be input or output with each other via the bus 22. The imaging drive circuit 16 is connected with a CCD 49 and a CDS / ADC unit 24.

  The operation unit 12 includes various input buttons and switches, and is a circuit that notifies the control unit of event information input from the outside (camera user) via these input buttons and switches. The control unit 13 is a central processing unit composed of, for example, a CPU, and has a built-in program memory (not shown). The control unit 13 is input by a camera user via the operation unit 12 according to a program stored in the program memory. This circuit controls the entire digital camera 40 in response to the instruction command.

  The CCD 49 receives an object image formed via the photographing optical system 41 according to the present invention. The CCD 49 is an image pickup element that is driven and controlled by the photographing drive circuit 16 and converts the light amount of each pixel of the object image into an electrical signal and outputs it to the CDS / ADC unit 24.

  The CDS / ADC unit 24 amplifies the electric signal input from the CCD 49 and performs analog / digital conversion, and temporarily generates the raw video data (Bayer data, hereinafter referred to as RAW data) that has just been subjected to the amplification and digital conversion. It is a circuit that outputs to the memory 17.

  The primary storage memory 17 is a buffer made of, for example, SDRAM, and is a memory device that temporarily stores the RAW data output from the CDS / ADC unit 24. The image processing unit 18 reads out the RAW data stored in the primary storage memory 17 or the RAW data stored in the storage medium unit 19, and performs various corrections including distortion correction based on the image quality parameter designated by the control unit 13. It is a circuit that performs image processing electrically.

  The storage medium unit 19 detachably mounts a card-type or stick-type recording medium made of, for example, a flash memory, and the RAW data transferred from the primary storage memory 17 to the card-type or stick-type flash memory It is a control circuit of an apparatus that records and holds image data processed by the image processing unit 18.

  The display unit 20 includes a liquid crystal display monitor 47 and a finder image display element, and is a circuit that displays an image, an operation menu, and the like on the liquid crystal display monitor 47 and the finder image display element. The setting information storage memory unit 21 stores a ROM unit in which various image quality parameters are stored in advance, and an image quality parameter selected by an input operation of the operation unit 12 among the image quality parameters read from the ROM unit. RAM section is provided. The setting information storage memory unit 21 is a circuit for controlling input / output to / from these memories.

(Modification of imaging element division)
In the first embodiment, the second embodiment, and the third embodiment described above, the first imaging optical system LS1 has the rectilinear optical axis AX1 without having a reflecting surface.
In each of the above-described embodiments, the optical path of the first imaging optical system LS1 can be bent using an optical path rigid element to form an image on the imaging element as follows.

  FIG. 16 shows a configuration from the optical path combining element 420 to the image plane IP in the configuration in which the optical path of the first imaging optical system LS1 is bent 90 degrees in FIG. 1 and the optical path combining element 420 is further added. 16A is a perspective view, FIG. 16B is a plan view seen from the direction of arrow B in FIG. 16A, and FIG. 16C is a side view seen from the direction of arrow C in FIG.

  As shown in FIG. 16, the optical path combining element 420 is composed of two second reflecting members (mirrors) MR12 and MR22 arranged so as to cross each other at right angles, and a light shielding plate 421 that partitions them. Yes.

  One reflecting member MR12 reflects the light beam from the first photographing optical system LS1 to the image plane IP side, and the other reflecting member MR22 reflects the light beam from the second photographing optical system LS1 to the image surface IP side. Let

  The light shielding plate 421 is arranged upright at the division position of the image sensor so that the image of one imaging optical system does not overlap with the other image. Surfaces other than the reflective surface are preferably subjected to antireflection treatment in order to prevent stray light.

  FIG. 17 shows another example of the optical path combining element shown in FIG. 16, where (a) is a perspective view, (b) is a plan view seen from the direction of arrow B in (a), and (c) is ( It is the side view seen from the arrow C direction in a).

  The optical path combining element 530 shown in FIG. 17 uses a prism as a reflecting member instead of the mirror of FIG. That is, the optical path combining element 530 includes two right-angle prisms 531 and 532 that are arranged in a direction in which inclined surfaces serving as reflection surfaces are orthogonal to each other, and a light-shielding plate 533 that partitions them. One prism 531 reflects the light beam from the first photographing optical system LS1 incident from one vertical surface on the back surface and emits the light from the other vertical surface to the image plane IP side. The other prism 532 similarly deflects the light beam from the second imaging optical system LS2 to the image plane IP side. The function of the light shielding plate 532 is the same as that of the light shielding plate 421 in FIG.

  Since the prism has the effect of extending the optical path length when the light beam passes, the use of the prism as a light beam combining element can shorten the back focus required for each lens system.

  In the modification of the photographic optical system of the present embodiment, it is designed as a retrofocus type in order to ensure a space for installing the reflecting member and the filter. However, when a prism member is used, there are restrictions on the back focus. This is advantageous in obtaining a degree of freedom in designing the optical system.

  The present invention can take various modifications without departing from the spirit of the present invention.

  As described above, the present invention is useful for an imaging device in which the optical path is not blocked by the zoom lens system even when the angle of view of the wide-angle lens system is increased.

LS1 First imaging optical system LS2 Second imaging optical system 100 Imaging device I Imaging element r1 Reflecting surface (reflecting member)
AX1, AX2 Optical axis 601 First optical system 602 Second optical system 603 Image sensor 604 Focus lens drive control unit 605 CPU
606 Display unit 607 User operation unit 608 Mirror control unit 701 3D mode operation button 702 Algorithm operation unit 703 Third image generation unit 704 Storage unit

Claims (15)

  A first imaging optical system for forming a first image;
  A second imaging optical system for forming a second image enlarged from the first image by the first imaging optical system;
  A first image formed by each of the first imaging optical system and the second imaging optical system; and a single image sensor that receives the second image and converts the second image into an electrical signal. ,
  The first image and the second image are configured to be simultaneously imaged so that the imaging field angle by the first imaging optical system and the imaging field angle by the second imaging optical system are different from each other,
  The first imaging optical system has a focusing lens group that moves during focusing;
  Further, the second imaging optical system is a zoom lens system,
  A control unit that controls the orientation of the imaging direction of the second imaging optical system based on distance information obtained by the focusing state of the first imaging optical system and a subject direction in the first imaging optical system An imaging apparatus capable of simultaneously capturing a plurality of images.   A first imaging optical system for forming a first image;
  A second imaging optical system that forms a second image enlarged than the first image by the first imaging optical system;
  A first image formed by each of the first imaging optical system and the second imaging optical system; and a single image sensor that receives the second image and converts the second image into an electrical signal. ,
  The first image and the second image are configured to be simultaneously imaged so that the imaging field angle by the first imaging optical system and the imaging field angle by the second imaging optical system are different from each other,
  The first imaging optical system has a focusing lens group that moves during focusing;
  The second imaging optical system is a zoom lens system including two reflecting members and a plurality of lens groups movable in the optical axis direction, and includes a focusing lens group that moves during focusing,
  A plurality of object distance information in an arbitrary area within the imaging range of the first imaging optical system is acquired by the second imaging optical system from the focusing in-focus state of the second optical system. An imaging device capable of simultaneously capturing images.   A first imaging optical system for forming a first image;
  A second imaging optical system for forming a second image enlarged from the first image by the first imaging optical system;
  A first imaging optical system formed by the first imaging optical system and the second imaging optical system, respectively, and a single imaging device that receives the second image and converts it into an electrical signal. ,
  The first image and the second image are configured to be simultaneously imaged so that the imaging field angle by the first imaging optical system and the imaging field angle by the second imaging optical system are different from each other,
  The second imaging optical system is a zoom lens system including two reflecting members and a plurality of lens groups movable in the optical axis direction,
  A distance information acquisition unit that acquires distance information of a subject based on a phase difference due to parallax between the first imaging optical system and the second imaging optical system, and capable of simultaneously capturing a plurality of images apparatus.   A distance information acquisition unit that acquires distance information of a subject based on a focusing state of the first imaging optical system;
  A display unit for displaying an image captured by the first imaging optical system;
  An operation unit for determining a main subject direction focused by the first imaging optical system;
  An imaging direction control unit that controls the imaging direction of the second imaging optical system based on the subject direction in the first imaging optical system and the distance information of the distance information acquisition unit;
The imaging apparatus according to claim 1, wherein a plurality of images can be simultaneously captured.   The imaging apparatus according to claim 4, wherein the operation unit is a touch sensor disposed on a display side of the display unit.   The second imaging optical system includes an eccentric moving optical element that moves eccentrically for changing the optical axis direction on the subject side,
  The decentering movement part which moves the decentering movement optical element in order to control the imaging direction of the 2nd imaging optical system based on the distance information of the distance information acquisition part. An imaging apparatus capable of simultaneously capturing a plurality of images according to any one of the preceding claims.   An algorithm storage unit storing an image generation algorithm;
  Based on the distance information of the subject acquired by the distance information acquisition unit and the image generation algorithm stored in the algorithm storage unit, the first image of the first image and the second image of the second image are used. The imaging apparatus according to claim 3, further comprising an image generation unit configured to generate an image.   The image generation algorithm performs brightness and saturation processing for short-distance objects in the image,
  When a long-distance object and a short-distance object are mixed, the brightness of the long-distance object and the short-distance object,
8. The imaging apparatus capable of simultaneously capturing a plurality of images according to claim 7, wherein image reconstruction is performed so that a saturation difference is enlarged according to the following conditional expression.
        0 ≦ V′−V <4 (3)
        1 <C'-C <6 (4)
  here,
  V is the brightness difference between the distant view and the near view of the acquired image expressed using the Munsell color system,
  C is the saturation difference between the distant view and the near view of the acquired image expressed using the Munsell color system,
  V ′ is the brightness difference of the reconstructed image,
  C ′ is the chroma difference of the reconstructed image,
And   The imaging apparatus according to claim 8, further satisfying the following conditional expression:
  If the farthest object in the screen is in the range of 10m to infinity,
    0 ≦ (V′−V) / (C′−C) <1 (5)
  If the farthest object in the screen is in the range of 0m to 10m,
    0 ≦ (C′−C) / (V′−V) <1 (6)   The first imaging optical system is a zoom lens system that has no reflecting surface, has a zoom ratio smaller than that of the second imaging optical system, and has a smaller total number of lenses than the second imaging optical system. An image pickup apparatus capable of simultaneously picking up a plurality of images according to claim 1.   The first imaging optical system is a single-focus lens system having no reflecting surface and having a total number of lenses smaller than that of the second imaging optical system. An imaging apparatus capable of simultaneously capturing a plurality of images according to claim 1.   An image by the first imaging optical system and an image by the second imaging optical system can be independently captured;
  12. The imaging apparatus capable of simultaneously capturing a plurality of images according to claim 1, wherein each image can be recorded independently.   The reflective surface closest to the object side in the second imaging optical system is an eccentrically moving reflective surface that moves eccentrically in order to change the optical axis direction on the subject side. An imaging apparatus capable of simultaneously capturing a plurality of images according to one item.   The imaging apparatus capable of simultaneously capturing a plurality of images according to claim 1, further comprising an entrance window common to the first imaging optical system and the second imaging optical system. .   The frame member having a helical screw hole formed so as to surround both optical axes of the incident optical axis of the first imaging optical system and the incident optical axis of the second imaging optical system. An imaging device capable of simultaneously capturing a plurality of images according to any one of 1 to 14.

Images