JPH03142421A - Camera - Google Patents

Abstract

PURPOSE:To enhance the detecting accuracy of a camera blurring quantity by detecting blurring in a horizontal direction with respect to a camera body by means of an automatic focus detecting element and detecting blurring in a vertical direction by means of a blurring detecting sensor. CONSTITUTION:A processing circuit 5 receives signals from an angular velocity senor 3 and an automatic focus detecting (AF) sensor 4, performs proper processing to the signals and converts them to a signal for driving a motor which corrects the camera blurring. Then, a driving circuit 6 for the motor, a correction optical system 7, an actuator 8 for driving the correction optical system 7 in a direction perpendicular to an optical axis direction, a mirror 9 which guides light to a finder and also transmits one part of the light, and a mirror 10 which guides the light to the AF sensor 4 are provided. The mirror 10 is a pellicle mirror and a luminous flux passing through a photographing lens 1 enters the AF sensor 4 in course of exposure by fixing the mirror 10 in a state shown in figure. The AF sensor 4 is constituted by arranging plural photodetectors in a horizontal direction and the moving quantity of an object image in the horizontal direction is measured by comparing the change of the contrast of the photodetector train.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention uses a COD sensor for automatic focus detection to detect the amount of camera shake in the horizontal direction with respect to the camera body, and to detect the amount of camera shake in the vertical direction with respect to the camera body. Regarding a camera that uses a dedicated sensor for detection.

2. Description of the Related Art Conventionally, cameras capable of detecting this type of camera shake have various structures. For example, there is a device that uses an automatic focus detection element as a camera shake detection sensor to detect horizontal camera shake (US Pat. No. 4,733,264).

In addition, there is another structure that uses two angular velocity sensors as sensors dedicated to detecting camera shake, and detects the amount of camera shake in the horizontal and vertical directions (
JP-A-61-150580, JP-A-61-15058
No. 1).

Problems to be Solved by the Invention However, the former structure described above can only detect the amount of camera shake in one direction, horizontally, and cannot detect the amount of camera shake in the vertical direction, where the amount of camera shake is generally large. There's a problem.

In addition, the latter structure uses dedicated sensors for both vertical and horizontal directions, so space is required to place both sensors within the camera body.
This poses a problem in that it is a major factor that prevents the camera body from being simplified, and it also becomes expensive.

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a camera whose camera body can be simplified in order to solve the above-mentioned problems.

Means for Solving the Problems In order to achieve the above object, the present invention uses a sensor dedicated to detecting camera shake in the vertical direction where camera shake is large, while using automatic focus detection in the horizontal direction where camera shake S1 is small. It was configured to use the same elements.

In other words, in an autofocus camera, camera shake in a direction horizontal to the camera body is detected by an autofocus detection element, while camera shake in a direction perpendicular to the camera body is detected by a camera shake detection sensor. Configured.

In the above configuration, the camera shake detection sensor can be configured to be an angular velocity sensor.

In the above configuration, the camera shake detection sensor may be an acceleration sensor.

Functions and Effects of the Invention According to the above configuration, when the release button is pressed against the camera body during shooting, the amount of camera shake is detected by using a sensor dedicated to detecting vertical angle changes where camera shake is large. On the other hand, since angle changes in the horizontal direction where the amount of camera shake is small are detected by the automatic focus detection element, only the vertical detection sensor needs to be folded and placed inside the camera body, reducing the number of parts. This makes it possible to simplify the camera body, and
It will be cheap. Furthermore, since the camera shake in the vertical direction is detected by a sensor dedicated to camera shake detection, it is possible to improve the detection accuracy of the amount of camera shake and to expand the detection range.

EXAMPLES Below, examples according to the present invention will be explained in detail based on FIGS. 1 to 11.

FIG. 1 shows a single-lens reflex camera according to this embodiment, which includes a camera shake detection device and a correction device.

In the figure, 1 is a photographing lens, 2 is a camera body, 3 is an angular velocity detection sensor, 4 is an automatic focus detection (AF) sensor, and 5 is a processing circuit. The processing circuit 5 is a circuit that receives signals from the angular velocity sensor 3 and the AF sensor 4, performs appropriate processing on these signals, and converts them into signals for driving a motor that corrects camera shake. Further, 6 is a motor drive circuit, 7 is a correction optical system, 8 is an actuator (motor or piezoelectric element) that drives the above-mentioned correction optical system 7 perpendicular to the optical axis direction, and 9 guides light to the finder and partially A mirror 10 that transmits light is a mirror that guides light to the AP sensor 4.

In FIG. 1, an angular velocity sensor 3 is disposed within the camera body 2, but instead of this sensor 3, acceleration sensors may be disposed at two locations to detect camera shake. In other words, when detecting the amount of camera shake in the vertical direction,
In the case of the angular velocity sensor 3, one sensor is used, and in the case of the acceleration sensor, two sensors are used to detect the amount of camera shake. In contrast, conventionally, when detecting the amount of camera shake in one direction, two angular velocity sensors or a set of four acceleration sensors are used to detect the amount of camera shake.

The mirror 10 is a pellicle mirror, and the mirror 10 is a pellicle mirror.
0 is fixed in the state shown in FIG. 1, so that the light flux passing through the photographing lens l enters the AF sensor 4 even during exposure.

The AP sensor 4 has a plurality of light-receiving elements arranged in the horizontal direction, and can measure the amount of movement of the subject image in the horizontal direction by comparing changes in contrast between the rows of light-receiving elements.

FIG. 2 shows a circuit block diagram of the camera used in this embodiment. In the figure, (μC) is a microcomputer (hereinafter referred to as "microcomputer") that performs the entire camera sequence, exposure control, and AP control, (LM) is a photometry circuit,
(F-D) is a focus detection unit having the above-mentioned AF sensor, and the data of the AP sensor is digitally recorded by a microcomputer (μ
Output to C). (LEC) is a lens drive circuit that drives the lens based on the day focus amount obtained based on the digital data of the focus detection section, and (AE) is a photometry circuit (L
The exposure control circuit (AVSI) that controls the aperture and shutter based on the aperture value and shutter speed determined based on the output of M) is an angular velocity sensor that detects the angular velocity in the vertical direction of the screen. Note that it is possible to arrange an acceleration sensor instead of the angular velocity sensor (AVSI) and measure the angle of camera shake. In addition, in the figure, (C5CI) is the angular velocity sensor (AVSI).
) is the driver of the camera shake correction lens that moves the camera shake correction lens along a plane perpendicular to the optical axis of the lens. (C8C2) is the focus detection section (F
- This is a drive unit for the camera shake correction lens that receives horizontal image movement information from the AP sensor in D) and moves the camera shake correction lens in the horizontal direction.

(DISP) is a display circuit that displays camera shake, (Z
EN) is a zoom encoder that informs the microcomputer of the focal length of the zoom lens. (S M) is the main switch that enables the camera to be driven, (Sl) is the shooting preparation switch operated by C, which performs shooting preparation operations such as photometry, AP, and camera shake detection, and (S2) is for controlling exposure. The release switch is operated by , (E) is the power supply, and (
DI) is a reverse charge prevention diode, (C1) is a backup capacitor (Tr, ) is a photometric circuit (L M )
, focus detection section (F-1)), lens drive circuit (LEC)
, the exposure control circuit (AE), respectively) power supply transistor; ('rr,) supplies power to the angular velocity sensor (AVSI); transistor performs 1; (Trs) supplies power to the camera shake correction lens drive circuit. It is a power supply transistor.

Next, based on FIG. 3, the routine from turning on the main switch (SM) to controlling exposure will be described below.

When the photographing preparation switch Sl is turned on, the power supply transistor T r1. T r 6. T r 3 is turned on (step #IO). Next, photometry, automatic focus detection (A
F') operation is performed (steps #15, 20). Figure 4.5 shows these subroutines.

FIG. 4 shows the photometry operation (step #15), in which the brightness value (BV) is inputted from the photometry circuit and the film sensitivity value (Sv) is inputted from the film sensitivity acquisition circuit to the microcomputer μC (steps #1501.+502).

Then, in step #1503, the exposure value Ev is set as Ev=B
After determining the aperture value Av and shutter speed Tv based on a predetermined AE program diagram in step #1.5011, the process returns.

FIG. 5 shows the automatic focus detection/AF flow in step #20. First, in step #200+, the focus detection means performs integration. After the integration is completed, data is dumped in step #2002, and based on the dumped input, day focus 1 (DF) is calculated in step #2003. It is determined in step #2004 whether or not the focus is in focus according to the obtained day focus amount DF, and if the focus is in focus, the step #2 is performed.
At step 005, the focus is displayed and the process returns. If it is not in focus, change the lens drive amount (Nc) from the day focus amount DF.
is determined in step #2006, the lens is driven by this amount Nc using the steering knob #2007, and the process returns.

After the above automatic focus detection/AF operation (step #20),
Determine the amount of camera shake in the horizontal direction and display it in step #25
- Perform in step #35. This operation is a routine for detecting the 'f-shake amount using a signal from a conventional automatic focus detection (AP) operation as shown in FIG.

In Figure 6, the light receiving element (CO
D) (7) Integrate the data Step #2501. ),
The digital data dumped in step #2502 is manually input into the memory 1 as object contrast data in step #2503. Next, step #2504,
Repeat the same operation in 2505 and manually transfer the time-delayed data to memory 2, Stella 7'#2506), 1st
By detecting the difference between the memory and the second memory in step #2507, the movement ff1KL of the image on the film surface is determined. It is determined in step #2508 whether the f hyperactivity ff1KL is large, and if the movement amount KI is large, a camera shake display is performed in step #2509 and the process returns. If the movement amount KL is small, the process returns without displaying any camera shake. do.

FIG. 7 shows the details of the routine for determining vertical camera shake in step #30 and step #357. That is, in this routine, a dedicated sensor (angular velocity sensor) is used to detect the amount of camera shake. In step #3001, this routine detects the angular velocity v(t) and calculates the angular change θ of the camera by integrating the detected angular velocity vQ). Then, in step #3002, if the angle change θ is larger than the camera shake tolerance (0M) on the image plane, step #3002 is determined.
In step 3003, camera shake is displayed. If it is determined that the amount of camera shake is small, it will be returned.

The routine described above is the hand shake warning routine in FIG. That is, the display in FIG. 3 (step #35
) is the above camera shake display (step #2509, 3003
．． 3015). After these routines, when the release switch S2 is further turned on (step #4
0), exposure control is started (step #45), and at the same time, step #25. A routine similar to the camera shake amount detection in #30 is performed in step #50, and the correction lens is further moved in step #55 based on the camera shake signal. Then, in step #55, exposure control is completed and the process returns.

Further, if the release switch S2 is not turned on at step #401, the process returns to step #15.

According to the above embodiment, the amount of camera shake is detected by using the angular velocity sensor 3 dedicated to camera shake detection to detect changes in angle in the vertical direction where the camera shake is large, such as by pressing the release button against the camera body 2 during shooting. On the other hand, angle changes in the horizontal direction where the amount of camera shake is small are detected by the light receiving element 4 for automatic focus detection, so only the vertical detection sensor needs to be placed inside the camera body 2, reducing the number of parts. This makes it possible to simplify the camera body 2 and make it inexpensive. Furthermore, since the amount of camera shake in the vertical direction is detected by the sensor 3 dedicated to camera shake detection, the accuracy of detecting the amount of camera shake can be improved and the detection range can be divided.

Note that the present invention is not limited to the above embodiments,
It can be implemented in various other ways.

For example, in the first embodiment shown in FIG. 1, the angular velocity sensor 3 may be replaced with the acceleration sensor described above, and the acceleration sensor may be placed on the camera body 2. This is shown in FIGS. 8 to 11 as a second embodiment. In FIG. 9, 3a and 3b are acceleration sensors, and these acceleration sensors 3a.

The acceleration information 3b is transferred to the processing circuit 5, where it is processed based on the routine shown in FIG. The acceleration sensors 3a and 3b are placed at two locations, front and rear of the camera body 2, in order to determine vertical camera shake.

FIG. 8 shows a routine for determining vertical hand shake using an acceleration sensor instead of the angular velocity sensor as the dedicated sensor. As described above, two acceleration sensors 3a and 3b are attached to the camera body 2, and the displacement amount al+82 is calculated by double integrating the respective accelerations α+(1) and α1(1) (step #3011 .3012). Acceleration sensor 3 a, 3
If the distance between b is L, then T an-' ((a,
-at)/L), the camera angle change θ is calculated (step #3013).

Then, if θ is greater than 0M in step #3014,
In step #3015, the process returns after displaying the camera shake, and if θ is smaller than 0M, the process returns.

In addition to the above-mentioned routine, it is possible to perform camera shake warning in both the vertical and horizontal directions on the display, while limiting camera shake correction during exposure to only the vertical direction.

The reason for this is that - inside the shell, - in an eye reflex camera, it is often difficult to guide light to the AP sensor during exposure, and vertical camera shake can be prevented by turning on the release switch S2 Vertical camera shake is essential because it sometimes occurs when camera shake is caused by camera shake (e.g., when the mirror is raised in an eye reflex camera), but horizontal camera shake is difficult to change depending on the release operation, so the above display is necessary. This is because it is sufficient to check whether a warning has been issued or not. In such a configuration, the mirror IO need not be a pellicle mirror, but may be a total internal reflection sub-mirror used within the shell.

FIG. 10 shows a routine for correcting camera shake only in the vertical direction. Steps #10 to #40 are similar to the routine shown in FIG. 3. Then, when the release switch S2 is turned on in step #40, horizontal camera shake determination is stopped and only vertical camera shake determination continues (step #40).
60). When exposure control is started (step #70),
The camera shake correction is performed until the exposure control is completed using the correction optical system 7 that can only correct vertical camera shake and its actuator 8 (steps #80 and 90).

FIG. 11 shows a circuit block diagram according to FIG. 10, which is basically the same as FIG. 2. This circuit differs from the circuit shown in FIG. 2 in that the drive section for the camera shake correction release is achieved by only a drive section (C9CI) for camera shake correction in the vertical direction.

[Brief explanation of the drawing]

FIG. 1 is a schematic explanatory diagram showing a camera according to an embodiment of the present invention, FIG. 2 is a block diagram of the camera according to FIG. 1, and FIG. Flowchart showing the routine, FIG. 4 is a flowchart of the photometry operation routine, FIG. 5 is a flowchart of the automatic focus detection operation routine, and FIG. 6 is a routine for detecting horizontal camera shake using the automatic focus detection element. 7 is a flowchart of a routine that uses an angular velocity sensor to detect the amount of camera shake in the vertical direction. FIG. 8 is a flowchart of a routine that uses an acceleration sensor instead of the angular velocity sensor to detect the amount of camera shake in the vertical direction. Flowchart, FIG. 9 is a schematic explanatory diagram of the camera according to the second embodiment of the present invention, FIG. 1O is a flowchart showing the routine from when the main switch is turned on until exposure is controlled, and FIG. FIG. 2 is a block diagram for performing image stabilization of the lens. l...Photographing lens, 2...Camera body, 3...
Angular velocity sensor, 3a, 3b...acceleration sensor, 4...automatic focus detection sensor, 5...processing circuit,
6... Motor drive circuit, 7... Correction optical system, 8
...actuator, 9. lO...mirror, μC
...Ma/f controller, LM...photometering circuit, F-D...
Focus detection section, LEC9... Lens drive circuit, AE... Exposure control circuit, AVS l... Angular velocity sensor, C9C
1, C8C2...Camera shake correction lens drive unit, D
ISP...display circuit, ZEN...zoom encoder, SM...main switch, St...shooting preparation switch, S2...lens switch, E...power supply, DI
... Reverse charging earth protection diode, Ct... Backup capacitor.

Claims (2)

[Claims] (1) In an autofocus camera, camera shake in the horizontal direction with respect to the camera body (2) is detected by the autofocus detection element (4), while camera shake in the vertical direction with respect to the camera body (2) is detected by the autofocus detection element (4). A camera characterized in that camera shake is detected by a camera shake detection sensor (3, 3a, 3b). (2) The above camera shake detection sensor is an angular velocity sensor (3
) The camera according to claim 1. (3) The camera according to claim 1, wherein the camera shake detection sensor is an acceleration sensor (3a, 3b).