JPH02160214A - Photographic device with image blurring preventing device - Google Patents

Abstract

PURPOSE:To eliminate draw a correcting lens back to a center position before a shutter is released and to attain fast continuous shooting by setting driving ranges for the compensating lenses and switching a driving range right before photography and a driving range in the opening of the shutter automatically. CONSTITUTION:Resistances 33 and 34 constitute a voltage dividing circuit to output an output voltage +D and resistances 35 and 36 constitute a voltage dividing circuit to output an output voltage +D2. The output +D1 and +D2 correspond to the limit widths of the driving ranges of respective optical systems to set the limit width of a driving limit V+ or -D1 by a analog switch 32 when a driving range setting signal 37 is at high level or the limit value of + or -D2 when at low level. Consequently, the reset operation for aligning the center of a correction optical system 13 with the center of a photographic optical system right before photography is not necessary, so speedy photography is attained.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a photographing device such as a camera, and more particularly to a photographing device equipped with an image blur prevention device.

(Prior Art) There has been a high demand for improving image deterioration caused by camera shake in photographic devices, and efforts have been made to eliminate camera shake. For example, by detecting camera shake and shifting the lens in the liquid, A method of removing image blur by shifting the image has been proposed, and Japanese Patent Publication No. 1986-
143330, you can change the angle of the mirror, CC
A method has been proposed in which the photographed image is shifted by switching the area actually used among the photographing areas of the D imaging device.

FIG. 4 shows a conventional example of such a photographing device equipped with an image blur prevention device. In FIG. 4, reference numeral 1 denotes an angular acceleration sensor that detects angular acceleration in a rotational direction centered on an axis perpendicular to the paper surface. 2 is an integrating circuit, which converts the angular acceleration detected in 1 into velocity. 7 is differentiator, 6.8 is subtractor, 9
is a potentiometer. The potentiometer 9 is linked to the movement of a lens 13 as a correction optical system, and is configured to output O at the center position and to output a voltage according to the position of the lens that moves in the vertical direction of the paper. 12
is a spring, which applies a force in one direction to the photographic lens 13, and when the coil 10 (described later) is not energized, the lens 13 remains stationary at approximately the center of its movable range where the spring force and its own weight are balanced. do. The image can be shifted by shifting the photographic lens 13. 10 is a coil, 11 is a magnet glued to the lens, 1B
is an analog switch, and is configured to be switched by a lens control signal 20 (not shown). When a current is applied to the coil 10, the magnet 11 receives a force, resists the force directed toward the center by the spring 12, and can drive the lens in the vertical direction. The potentiometer 9, the subtracter 6, and the differentiator 7 that slide in conjunction with each other are configured as a whole to perform feedback control based on the vibration velocity, and constitute a velocity input actuator 19. When a + (plus) voltage is input to the ten input terminal of the subtractor 6, the lens moves upward on the paper at a speed corresponding to the voltage, and a - (minus) voltage is input. In this case, it is configured to move downward as well.

18 is an analog switch, and 20 is a lens position control signal of a lens connected to a control CPU of a known camera (not shown), and the signal is output at a timing described later.

Next, the operation of such an image blur prevention device will be explained.

First, hold the camera in your hand, point it at the first subject to be photographed, and press the shutter release button (not shown) of the camera. The power to each part of the camera is turned on, and the lens position control signal from the signal line 20 is set to a high level. The analog switch 18 controls the angular velocity signal of camera shake output from the integrator 2 to the lens velocity control actuator 1.
9, and the image stabilization is in operation. Therefore, in this image blur prevention state, the image can be made to appear stationary by driving the lens according to the angular velocity of camera shake, and the image seen through the finder appears stationary.

Next, when actually taking a picture, the lens position control signal is set to a low level immediately before the shutter operation starts. Then, the analog switch 18 connects the output of the subtracter 8 and the ten input of the subtracter 6. At this time, potentiometer 9
The polarity of the lens position signal detected in is inverted by a subtracter 8 and connected to a speed manual actuator 19, so that feedback control is performed based on the lens position. As a result, the lens is attracted to the point where the lens position signal becomes 0, that is, the center position, and becomes stationary and fixed. In other words, the lens position control signal is
It can also be said to be a centering signal for the lens.

Further, when the lens position control signal 2o becomes high level again, the lens starts to move again in the image blur prevention state, a known shutter operation is performed, and photography can be performed in the image blur prevention state.

FIG. 5 shows the relationship between the position of the lens 13 and the lens position control signal 20 in a conventional example.

The image stabilization device for preventing blurring in the rotational direction about an axis perpendicular to the plane of paper has been described above, but the same applies to blurring in the rotational direction about an axis perpendicular to the optical axis and parallel to the plane of paper. Needless to say, an image stabilization device having the following configuration is provided.

In the conventional example described above, just before opening the shutter, the lens is pulled toward the center to reset the image stabilization device, and then, at the same time as the shutter opens, the image stabilization device is activated. It is composed of

[Problem to be solved by the invention]

In the conventional example described above, since the correction lens is always pulled to the center position before the shutter is opened, there is a problem that the frame at the moment when the user looks through the viewfinder and presses the shutter release button is different from the position of the frame that is actually photographed. Additionally, cameras that require high-speed continuous shooting have problems such as the time from when the shutter release button is pressed to when the shutter release button is opened is very short, so there is no time to pull the correction lens toward the center. Ta. An object of the present invention is to provide a new photographing device that solves the above problems.

[Means to solve the problem]

In the present invention, a plurality of drive ranges are set for the correction lens, and by automatically switching between the drive range immediately before shooting and the drive range while the shutter is open, the correction lens It is no longer necessary to pull it back to the center position.

[For production]

Letting the position of the lens 13 be X, x>DI (or x>
D2), the output of the comparator 28 is high in FIG. 1, and otherwise the output of the comparator 28 is low. Further, at a lens position where x<-DI (or x-D2), the output of the comparator 2 becomes high, and in other ranges, it outputs low. The NOR circuit 26 is connected to comparators 27 and 28, and -DI <x<DI (or -D2 <x<D2
), the output will be high, and otherwise it will be low.

The analog switches 21, 22, and 23 are turned on when high is input, and therefore, the relationship of the analog switches to the range position is as shown in Table 1 below.

The analog switch 21 is connected to a diode 24, and when the lens position
In the case of 10, the drive is performed only (that is, when the camera shake is in the direction of moving the lens in the child direction).

The analog switch 22 is connected to a diode 25 and D
It turns ON when I < x (D2 < x), and actuator 1 is activated only when the camera shake speed moves the lens in one direction.
A drive signal is transmitted to 9.

The analog switch 23 operates to connect the integrator 2 and the actuator 19 and cause the actuator 19 to perform an image blur prevention operation when the lens is -DI <x<DI (-D2 <x<D2).

Therefore, the movable range of the lens 13 (that is, the correction optical system) is substantially limited to ±D, (±D2),
Either of the movable ranges ±D1 and ±D2 is selected by the control means.

(Embodiment) FIG. 1 shows a first embodiment of the present invention, and the same part numbers as in the conventional example indicate the same components.

21, 22, 23 are analog switches, 24゜25 are diodes, 26 are NOR circuits, 27゜28 are comparators, 29 is an operational AMP, 3G.

31, 33, 34, 35, and 36 are resistors, and 32 is an analog switch which is switched by a drive range setting signal 37 from a control CPU (not shown).

′! In Figure J1, the block surrounded by a chain line constitutes a correction optical system control means 38, and the movable range of the correction optical system is automatically selected by the control means 38.

Next, correction optical system control means 38'E1. and other parts.

Resistors 33 and 34 are voltage divider circuits that output an output voltage +D1,
Resistors 35 and 36 are configured as a voltage dividing circuit to output an output voltage +D2. And this output child〇 and +D
2 respectively correspond to the limit width of the driving range of the correction optical system,
When the drive range setting signal 37 is at a high level by the analog switch 32, the drive limit width is set to V:t-D1, and when it is at a low level, the drive range setting signal 37 is set to a limit width of ±D2. The output of the analog switch 32 is reversed in polarity by an inverting amplifier composed of resistors 30 and 31 and an operational amplifier 29, and becomes -Dl (or -D2), and is input to the output of the comparator 27, while the output of the comparator 2
It is input as +Dt (or +D2) to the single power of 8. The output of the potentiometer 9, that is, the lens position signal, is input to the comparator 27 and 28 respectively.

Therefore, if the position of the lens is X, then x > DI (or
>Dl ), the output of the comparator 28 is high; otherwise, the output of the comparator 28 is low. Further, the output of the comparator 27 becomes high at the lens position where x<-DI (or x-D2), and outputs low in other ranges.

The NOR circuit 26 is connected to comparators 27 and 28, and the output is high only when -DI<x<DI (or -Dl<X<Dl), and is low otherwise.

The analog switches 21, 22, and 23 are turned ON when the high level is manually input, and therefore, the relationship of the analog switches to the lens position is as shown in Table 1 below.

The analog switch 21 is connected to a diode 24, and when the lens position
Driving is performed only in the case of 10 (that is, when the camera shake is in the direction of moving the lens in the sub-direction).

The analog switch 22 is connected to a diode 25 and D
Actuator 1 is turned ON when I < x (Dz < x), and actuator 1 is activated only when the camera shake speed moves the lens in one direction.
A drive signal is transmitted to 9.

The analog switch 23 is configured such that the lens is -D I < X < DI (-D 2 < X <
D 2 ), the integrator 2 and the actuator 19 are connected and the actuator 19 is operated to perform an image blur prevention operation.

Therefore, the movable range of the lens 13 (that is, the correction optical system) is substantially limited to ±Ds (±Da), and either the movable range ±DI or ±D2 is selected by the control means. .

FIG. 2 is a diagram showing the operation of the correction optical system controlled by the control means 38.

The operation of the photographing apparatus of this embodiment will be explained below with reference to FIGS. 1 and 2.

When a camera user holds the camera and presses a shutter release button (not shown) when taking a picture, a first switch (not shown) that responds to the first stroke of the button is turned on, and the power of the camera (not shown) is turned on. , the drive range setting signal 37 from the control CPU of the camera (not shown) becomes high. In this state, the image stabilization device is activated. The lens driving range is ±D! The image stabilization device performs image stabilization only when the lens movement is within the range of ±D1.6Next, when the camera user presses the shutter release button further, a second switch (not shown) closes, As a result, the drive range setting signal 37 becomes a low state, and the drive range becomes a range of ±D2 (Dz>DI). In this state, the shutter is opened and photographing is performed.

That is, in the photographing apparatus of the present invention, since there is no need for a reset operation to align the center of the correction optical system with the center of the photographing optical system immediately before photographing, photographing can be carried out quickly.

Moreover, even if the correction optical system reaches the limit of the first movable range as shown in FIG. 2, the correction lens can be driven in any direction during photographing.

FIG. 3 shows another embodiment of the invention, in which components labeled with the same numbers as in FIG. 1 are the same as those shown in FIG.

In FIG. 3, analog switches 39 and 40 are connected to a NOT circuit 41 and an OR circuit 42, respectively, and are turned on when a high level is input. 43 and 44 are resistors, and 45 is an operational amplifier.

From the above, the operations of the analog switches 39 and 40 with respect to the lens position are as shown in Table 2 below. (The lens position is assumed to be X.) In the embodiment shown in FIG. 3, the lens position X is −DI<
When x<DI, the output of the integrator 2 is connected to the actuator 19 through an analog switch, and the image stabilization is activated, but if the range of lens ±D1 (±D2) is exceeded, The analog switch 39 is turned off, and the analog switch 40 is turned on. Then, the lens position signal generated from the potentiometer 9 is inverted by an inverting amplifier including resistors 44 and 43 and an operational amplifier 46, and is input to the actuator 19. This becomes a force that pulls the lens back to the center, and as a result, the driving range of the lens is limited to ±Ds (or ±Dz).

In normal single-shot photography, the operation of the second embodiment is almost the same as that of the first embodiment, and operates at the timing shown in FIG. 2, so a description thereof will be omitted.

The second embodiment differs greatly from the first embodiment in that the drive limit of the image stabilization device is changed from ±D2 to ±D, especially after shooting is completed.
This is a case where the value changes to 1. That is, in the first embodiment, if the lens is outside the ±D1 drive range immediately after switching, the drive signal for preventing image blur from camera shake is
The lens is driven only when trying to move the lens toward the center, and moves relatively slowly to the ±D1 drive range while preventing image blur, whereas in the second embodiment, the lens is driven from ±D2 to ±D1. This embodiment is different from the first embodiment in that when the range is changed, the lens is quickly moved to B position within the range of ±D1.

〔Effect of the invention〕

As explained above, in the photographing device of the present invention, a plurality of movable ranges are set for the correction optical system, and a control means is provided that automatically selects the movable range and controls the operation of the correction optical system. Because of this, there is no need to reset the correction optical system to the dew position (center of the shadow-light system) before shooting, unlike with conventional photographic devices. There is no risk that the composition will be different (also, high-speed snapshots are possible).

[Brief explanation of the drawing]

FIG. 1 is a diagram showing the main parts of the present invention in a first embodiment of the photographing device of the present invention, FIG. 2 is an explanatory diagram of the operation of the device in FIG. 1, and FIG. 3 is a second embodiment of the present invention. A schematic diagram of
FIG. 4 is a diagram showing the configuration of a conventional photographing device, and FIG. 5 is a diagram explaining the operation of the device shown in FIG. 4. 1... Angular acceleration sensor 2... Integrating circuit 6...
Subtractor 7...Differentiator 8...Subtractor
9... Potentiometer 10... Coil
11...Magnet 12...Spring 13...Lens (correction optical system) 21-23...Analog switch 24.25...Diode 32...Analog switch 39.40...Analog switch 38 ...Correction optical system control means

Claims (1)

[Scope of Claims] 1. In a photographing device with an image blur prevention device that has a correction optical system for preventing image blur on an image forming plane, a plurality of movable ranges are provided as the movement range of the correction optical system. A photographing device with an image blur prevention device, characterized in that it has a correction optical system control means for selecting. 2. The correction optical system control means includes a switching means for automatically switching the movement range of the correction optical system between a movement range immediately before photographing and a movement range while the shutter is open. Photographic device with image stabilization device.