JPH11183782A - Image pickup device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an image pickup device capable of smoothly performing macrophotographing even from automatic focusing photographing without requiring special switching operation. SOLUTION: This device is equipped with a movable focusing optical means 1 for focusing, a movable variable power optical means 6 for variable power, and a fine displacing optical means 4 capable of finely displacing from an origin position for the purpose of automatic focusing detection. It is constituted to perform automatic focusing making macrophotographing possible by moving a part of or all of a relay optical system lens 5. Then, it is provided with a detector for detecting macro-operation so as to stop the movement of the means 1 as soon as the macro-operation is performed. When the macrophotographing is finished, operation for restarting automatic focusing operation is performed.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an imaging device,
More particularly, the present invention relates to an optical apparatus suitable for a television camera or a video camera that performs autofocus shooting with a zoom lens configured to perform macro shooting by moving a relay lens.

[0002]

2. Description of the Related Art FIG. 5 is a diagram showing a conventional example. In the figure, reference numeral 101 denotes a focus lens group that performs focusing of a zoom lens, 102 denotes a lens group that performs a zoom operation,
Reference numeral 103 denotes an aperture device, 104 denotes a wobbling lens that performs micro-movement driving, 105 denotes a relay lens, 106 denotes a variable-magnification optical system lens that can be inserted and removed, and 108 denotes a relay having a structure that enables macro photography by moving in the optical axis direction. Lens, 1
Reference numeral 09 denotes an image sensor, 110 denotes a video signal processing circuit, 111 denotes a focus lens driving device, 112 denotes a zoom lens driving device, 113 denotes a diaphragm driving device, 114 denotes a wobbling lens driving device, 116 denotes an arithmetic circuit, and 117 denotes an automatic focusing function. ON / OFF switch.

Conventionally, this type of lens has a configuration in which macro photography can be performed by setting a manual focus operation state by a switch when performing macro photography and then moving the relay lens 108 in the front-back direction along the optical axis. Was.

[0004]

However, if the macro photography is performed during the auto focus photography in the above-described conventional method, the photography system recognizes that the focus is out of focus and starts the AF operation.
However, there is a disadvantage that the position of the focusing lens cannot be determined because the focus cannot be completely adjusted. For this reason, when performing macro photography, the photographer must first release the automatic focus function to set the camera to a manual focus state, and then perform the macro operation, which is extremely troublesome.

In macro photography, it is preferable to set the zoom lens at the wide-angle end so that it can be closest to the object. However, when it is desired to quickly shift from the normal shooting state to the macro shooting, the automatic focusing function is released and the state is changed to a manual state. Then, it is necessary to perform a macro operation after zooming to the wide-angle end, which is extremely troublesome, and is a great restriction in photographing.

Further, when it is desired to intentionally blur the focus, it is possible to shift the focus by moving the focus lens. However, when the zoom is on the wide-angle side, the effect is small, and when the focus lens is moved, the angle of view generally fluctuates in many cases. For this reason, it looks as if a minute zoom has been performed, and there is a problem in photographing. Therefore, it is common to use a macro.

In such a case, in the conventional example, the focus lens starts to move without permission when performing macro shooting. Similarly, it is necessary to temporarily switch to the manual operation, and the time and effort must be taken. Note that it is also possible to forcibly manually hold the movement of the focus lens with the automatic focus shooting. In this case, an excessive load is applied to the focus lens driving system, which is likely to cause a failure and consumes unnecessary power, which is not practical.

According to the present invention, macro photography, which has been conventionally performed by switching to the manual focus method, can be changed from automatic focus photography to a drive device and a position detection device which are already prepared for auto focus control. However, an object of the present invention is to provide an imaging apparatus capable of performing macro shooting smoothly without any special switching operation.

[0009]

SUMMARY OF THE INVENTION An image pickup apparatus according to the present invention comprises a movable focusing optical means for focusing, a movable magnification optical means for zooming, and an origin for automatic focus detection. A micro-displacement optical means capable of micro-displacement from a position,
An image pickup apparatus configured to perform automatic focusing by moving a part or all of a relay optical system lens to enable macro shooting has a detecting device for detecting a macro operation, and performs a macro operation. At the same time, the movement of the focusing optical unit is stopped, and an operation of restarting the automatic focusing operation is performed when the macro shooting is completed.

Further, the imaging apparatus according to the present invention comprises a movable focusing optical unit for focusing, a movable zooming optical unit for zooming, and a small displacement from the origin position for automatic focus detection. Macro imaging is started in an imaging apparatus having a possible small displacement optical means, and configured to perform automatic focusing by moving part or all of the relay optical system lens to enable macro imaging. A means for storing the position of the focusing optical means at a certain moment, and after the macro shooting, returning to the position where the focusing optical means is stored.

Further, the imaging apparatus according to the present invention comprises a movable focusing optical means for focusing, a movable zoom optical means for zooming, and a small displacement from the origin for automatic focus detection. To perform macro photography in an imaging apparatus comprising: a possible small displacement optical means, and configured to perform automatic focusing by moving a part or all of a relay optical system lens to enable macro photography. Detects the zoom position of the zoom optical unit and the position of the focusing optical unit at the moment when the operation is performed, and forcibly focuses with the zoom optical unit if it is inappropriate for macro shooting. The first mode of moving the optical means for focusing to an appropriate position, and stopping or holding at least the focusing optical means from the state immediately before the macro operation even if the state is inappropriate for macro photography. The second mode controlled to The Have, in which the first and second modes equipped with a selectable switching switch.

Further, in the image pickup apparatus according to the present invention, a display device for notifying a photographer of a selected state of the mode switching switch is provided.

According to the present invention, in an image pickup device for forming an object image on an image pickup means surface by a focus lens group, a zoom lens group, and a relay lens group, drive means for driving the zoom lens and a zoom lens are constituted. Using a signal obtained by the imaging means when the wobbling lens group is moved, focus detection means for performing a focusing operation by moving the focus lens group, macro photographing means for moving a part or all of the relay lens group, A device for detecting an operation of the macro photographing means is provided, and the drive control of the focus lens group is temporarily stopped based on a signal detected at the time of the macro operation. Even if the focus is deviated by the macro operation, the AF lens does not inadvertently move the focus lens,
It is characterized in that the macro shadow can be continued.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A preferred embodiment of an imaging apparatus according to the present invention will be described below with reference to the drawings. FIG. 1 is a diagram that best illustrates the features of the present invention. In FIG. 1, 1 is a focus lens group for focusing a zoom lens, 2 is a zoom lens group for performing a zoom operation, 3 is a diaphragm device, 4 is a lens (wobbling lens) that moves slightly in the optical axis direction, and 5 is a relay lens. Reference numeral 6 denotes a variable-magnification optical system that is removably arranged on the optical axis. Reference numeral 7 denotes a relay lens that can move in the optical axis direction during macro shooting. Reference numeral 8 denotes a lens mount. Reference numeral 9 denotes an image sensor. Reference numeral 10 denotes video signal processing. A circuit 11 for driving a focus lens group 1 for driving the focus lens group 1;
Reference numeral 2 denotes a drive unit for driving the zoom lens group 2, reference numeral 13 denotes a drive unit for driving the stop of the stop device 3, reference numeral 14 denotes a drive unit for driving the wobbling lens 4, and reference numeral 15 denotes an arithmetic unit.

16 is a detecting device for detecting a macro operation, 22 is a position detecting device for the focus lens group 1, 23
Is a detecting device for detecting the selected diaphragm diameter of the diaphragm device 3,
24 is a means for detecting the position of the wobbling lens 4.

In FIG. 1, when the photographer performs a macro operation for moving the relay lens 7, a signal is emitted from the detecting device 16. As a result, the arithmetic unit 15 temporarily stops the normal automatic focusing operation, and the photographing device enters the macro photographing mode. In this mode, the drive control of the focus lens group 1 is stopped, and shooting is continued with the position of the focus lens group 1 immediately before macro shooting.

At the time of normal auto focus photographing, the relay lens 7 is used.
By moving the focus lens group, correction is performed by moving the focus lens group 1 based on the signal detected by the minute movement of the wobbling lens 4. In macro shooting mode, focus lens group 1
Since the lens does not move, the focus of macro photography can be adjusted by adjusting the amount of movement of the relay lens 7, as in the case of a zoom lens that is not an autofocus method.

Next, a description will be given of a second embodiment of the imaging apparatus according to the present invention. FIG. 2 is a diagram that best illustrates the features of this embodiment. In FIG. 2, a storage unit 17 is provided for storing the position of the focus lens group 1 at the moment of shifting to the macro operation. This example shows a configuration in which, even when the photographer unintentionally moves the focus lens group 1 manually, for example, the macro lens is returned to the immediately previous state after macro photography. In the figure, other components of the storage unit 17 are the same as those in FIG.

As described in the first embodiment, the driving device 11 of the focus lens group 1 stops the operation by the signal issued from the detection device 16 at the same time as the macro photography is performed. At that time, the storage unit 17 temporarily stores the position information of the focus lens group 1 obtained by the position detection device 22.

When the photographer manually moves the focus lens group 1 in this state, the position information of the focus lens group 1 stored in the storage unit 17 and the position information obtained from the position detection device 22 at the time when the macro photography is completed are obtained. It is assumed that there is a difference from the position information of the focus lens group 1 to be obtained. In this case, the arithmetic unit 15 moves the focus lens group 1 via the drive unit 11 until the position information of the focus lens group 1 stored in the storage unit 17 and the output of the detection device 22 reach a value that can be considered to match. It is possible to return to the state immediately before macro shooting.

Next, a description will be given of a second embodiment of the imaging apparatus according to the present invention. FIG. 3 is a diagram that best illustrates the features of this embodiment. In FIG. 3, in addition to the original usage of macro photography, which performs close-up photography, even if the photographer intentionally blurs the subject, the user can select a macro mode to select a photography method suitable for each. FIG. In the figure, reference numeral 18 denotes a macro mode selection switch, reference numeral 25 denotes a zoom lens position detecting device, and other components are the same as those in FIG.

The first mode is a mode in which an original close-up photographing is performed. When a macro operation is performed, a signal is emitted from the detection device 16 as in the first embodiment. Here, in the present embodiment, in order to create a state most suitable for close-up photography, the arithmetic unit 15 issues a command to the focus driving device 11 to move the focus lens group 1 in the closest direction based on a signal from the detection device 16. A command is issued to the zoom drive device 12 to move the zoom lens group 2 to a wide angle.
When each of the focus drive device 11 and the zoom drive device 12 completes the movement according to the command from the arithmetic device 15, the respective drive controls are stopped.

In this state, the photographer can focus on macro photography simply by moving the relay lens 7 having a macro function. When the macro operation is completed and the relay lens 7 is returned to the original position, the first mode is released by the signal of the detection device 16, and the mode returns to the normal autofocusing.

Here, in the same manner as described in the second embodiment, the positions of the focus lens group 1 and the zoom lens group 2 immediately before the macro shooting are stored in the storage device 17, and immediately after the macro shooting is completed, the previous position is set. You may comprise so that it may return to a state. In this case, when the macro mode switch is operated,
This signal switches to the second mode. The second mode is a mode that is effective when the photographer wants to intentionally blur the subject during autofocus shooting, and is a mode in which the operation described in the first or second embodiment is performed.

The display device 26 can be used during macro photography as shown in FIG. For example, by changing the color depending on the macro mode, it is possible to confirm the macro shooting intended by the photographer, and it is also possible to prevent an erroneous operation.

[0026]

As described above, according to the present invention, by stopping unnecessary movement of the focus lens at the same time as the macro operation in this kind of image pickup apparatus, a troublesome operation for the photographer who switches to manual focus each time. Is unnecessary. In addition, when the photographer inadvertently performs a macro operation, it is possible to prevent an unexpected operation of the photographer, such as starting the automatic focusing operation of the photographing apparatus.

In addition, by suppressing unnecessary operation of the focus driving unit, which is considered to have the largest power consumption, it is possible to reduce the power consumption of the system, and it is possible to perform photographing for a longer time when the battery is driven. Become. Furthermore, the macro operation can be performed smoothly even during autofocus shooting, and an effect that cannot be realized by a conventional autofocus lens, such as intentionally shifting the focus, is achieved.

[Brief description of the drawings]

FIG. 1 is a diagram illustrating a schematic configuration of an autofocus lens according to a first embodiment of the present invention.

FIG. 2 is a diagram illustrating a schematic configuration of an autofocus lens according to a second embodiment of the present invention.

FIG. 3 is a diagram illustrating a schematic configuration of an autofocus lens according to a third embodiment of the present invention.

FIG. 4 is a diagram illustrating a schematic configuration of an autofocus lens according to a third embodiment of the present invention.

FIG. 5 is a diagram showing a configuration in a conventional example.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Focus lens group 2 Zoom lens group 3 Aperture device 4 Wobbling lens 5 Relay lens 6 Variable magnification optical system 7 Relay lens 8 Lens mount 9 Image sensor 10 Image signal processing circuit 11 Focus lens drive unit 12 Zoom drive unit 13 Aperture drive unit 14 Wobbling lens driving unit 15 Arithmetic unit 16 Detecting unit 17 Storage unit 18 Switch 22 Focus lens position detecting unit 23 Aperture diameter detecting unit 24 Wobbling lens position detecting unit 25 Zoom lens position detecting unit 26 Display device

Claims (4)

[Claims] 1. A movable focusing optical means for focusing,
A movable zoom optical means for zooming, a micro-displacement optical means capable of micro-displacement from an origin position for automatic focus detection,
In the imaging device configured to perform automatic focusing that enables macro photography by moving a part or all of the relay optical system lens, comprising a detection device for detecting a macro operation, An imaging apparatus, comprising: stopping the movement of the focusing optical means at the same time as the macro operation is performed; and restarting the automatic focusing operation when the macro shooting is completed. 2. A movable focusing optical means for focusing,
A movable zoom optical means for zooming, a micro-displacement optical means capable of micro-displacement from an origin position for automatic focus detection,
An imaging apparatus comprising: a part or the whole of a relay optical system lens, and configured to perform automatic focusing enabling macro photography, wherein the focusing optics at a moment when macro photography is started An imaging apparatus comprising: means for storing the position of the means; and returning to the position at which the focusing optical means is stored after the macro shooting is completed. 3. A movable focusing optical means for focusing,
A movable zoom optical means for zooming, a micro-displacement optical means capable of micro-displacement from an origin position for automatic focus detection,
In an imaging device configured to perform automatic focusing by moving a part or all of a relay optical system lens to enable macro shooting, the moment when an operation for performing macro shooting is performed is provided. Detects the zoom position of the zoom optical unit and the position of the focusing optical unit, and if it is inappropriate for macro photography, forcibly moves the zoom optical unit and the focusing optical unit to the appropriate positions. The first mode for moving and the second mode in which at least the focusing optical unit is controlled to stop or hold the movement from the state immediately before the macro operation even in the case of a state inappropriate for macro photography. An imaging apparatus comprising: a switching switch having a first mode and a second mode. 4. The image pickup apparatus according to claim 4, further comprising a display device for notifying a photographer of a selected state of the mode switching switch.