JPS6353529A - Blurring preventive camera - Google Patents

Abstract

PURPOSE:To inform a photographer of the presence/absence of blurring in the course of photographing so that he can take a faultless photograph, by comparing a blurring value with a reference blurring value at which blurring is allowable and actuating a warning means when the blurring value is larger than the reference value. CONSTITUTION:Data stored and held in a blurring quantity storing circuit 52 while a shutter is run are outputted to a blurring quantity dividing circuit 53 and blurring quantities while the shutter is run are divided in time series. Then a blurring value (e) which is calculated from the difference between the maximum and minimum values of the blurring quantities after the division by the circuit 53 is compared with a reference blurring value (b) at a blurring quantity comparing/discriminating circuit 54. When the blurring value (e) is larger, it is outputted to an alarm display driving circuit 56 and a display 57 is caused to display an alarm so that the photographer can know that the photograph he has just taken is blurring and he can be urged to take the photograph again.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Application of the Invention] The present invention relates to an image blur prevention camera, and more particularly to a camera that allows a photographer to know whether or not blur has actually occurred during shooting. It is something.

[Background of the invention]

Generally, when taking a picture with a camera handheld, the image may be blurred.

To reduce image blur, increase the shutter speed,
Since a simple method is to use a photographic lens with a short focal length, cameras have been proposed that are configured to give priority to the high-speed shutter side.

However, since such cameras are programmed to give priority to the high-speed shutter side, it may not be possible to use frequently used combinations of aperture and shutter speed, and regardless of the photographer's ability to prevent camera shake, Since the image is taken with a high-speed shutter, the photographer's intention (shutter time, aperture effect, etc.) may not be fully reflected.

In addition, the main focus of such cameras is to reduce the occurrence of image blur as much as possible by increasing the shutter speed, and the photographer is required to check whether or not image blur occurs during actual shooting. Since the camera is not designed to notify the user of the situation, it is necessary to take several extra photos if the image is likely to be blurred.

However, whether or not image blur is likely to occur depends on the experience of the photographer, and whether or not image blur has been prevented is only confirmed after the film is developed, so it is 100% image blur free. It doesn't matter what you did.

[Purpose of the invention]

The present invention has been made in order to solve these conventional problems.It notifies the photographer of the presence or absence of image blurring during photography, and enables the photographer to take flawless photographs. The object of the present invention is to provide an anti-shake camera that can take pictures with as much reflection as possible.

[Summary of the invention]

The image blur prevention camera according to the present invention includes a camera shake amount detection means that detects the amount of camera shake from acceleration, and an image blur amount calculation that calculates the amount of image shake on a film surface based on the amount of camera shake detected by the camera shake amount detection means. and an image blur value which is connected to the image blur notification means and which is set in advance to be an image blur value obtained from the difference between the maximum value and the minimum value of the image blur amount in a predetermined time from the image blur amount calculation means during shutter operation. The present invention is characterized by comprising means for comparing the image blur value with a reference image blur value that is allowable, and operating the notification means when the image blur value is larger than the reference image blur value.

[Embodiments of the invention]

The present invention will be described in detail below based on embodiments shown in the drawings.

FIG. 1 is a schematic diagram of a camera body showing an embodiment of the camera according to the present invention, and FIG. 2 is a sectional view showing a state in which a photographic lens is attached to the camera body of FIG.

In the figure, I denotes a camera body, and a grip part 4 is provided on one side of the front part. In the following description, the direction parallel to the film feeding direction is referred to as the X-axis direction, the direction perpendicular to the X-axis direction and the vertical direction is referred to as the Y-axis direction, and the direction of the optical axis of the photographing lens is referred to as the biaxial direction. 2 fields.

2b is an acceleration sensor whose sensitivity axis coincides with two axes, which are arranged on the grip part 4 so as to be spaced apart from each other in the y-axis direction;
One acceleration sensor 2& is provided near the release button 4&, and the other acceleration sensor 2b is provided at the lower end of the grip 4. 3m and 3b are acceleration sensors arranged facing each other in the X-axis direction and having their sensitivity axes coincident with the Z-axis direction; one acceleration sensor 3a is provided near the release button 4a, and the other acceleration sensor 3b is grip 4
is provided at the opposite end of the Note that the acceleration sensor 2a may also serve as the acceleration sensor 3. This release button 4
a is composed of a first switch that is turned on at the first stroke and a second switch that is turned on at the second stroke, and when the first switch is turned on, photometry and distance measurement are started.
When the second switch is turned on, shirt release is started. And release button 4 for shutter release.
In order to distinguish between the case where a is pressed and the case where an object or the like hits the release button 4a by mistake, the first switch is turned ON.
If a certain period of time does not elapse from when the second switch is turned on until the second switch is turned on, there is a prohibition period in which the shirt release cannot be performed even if the second switch is turned on.In this embodiment, this prohibition period is assumed to be 100 m5. There is. 5 is a camera contact point for interface such as lens focal length, subject distance and power supply to the lens from the photographic lens 18, 6 is a film/4 trone, and 7 is a pz displayed on the outer circumferential surface of the film/4 trone 6: z - Dx contact for reading muddy breath. 11 is a focus lens system, 12 is a focus lens drive unit consisting of a helicoid, a motor, etc., 13 is a zoom lens system, and 14 is a motor and cam or? A zoom lens drive unit consisting of a chair coil, etc., 1
Reference numeral 5 denotes an aperture, 16 an aperture drive unit consisting of a step motor, etc., and 17 a lens contact which can be connected to the camera contact 5.

Figure 3 shows the acceleration sensor 2& shown in Figure 1.

2b, 3m, and 3b are detailed views. Reference numeral 21 denotes an outer frame, from which a base 24 with a coil 23 attached is suspended by two support springs 22 having low rigidity. Above and below the coil 23 and pace 24, a magnetic circuit board 25 and permanent magnets 26m and 26b (26b
(not shown) are arranged respectively. Magnetic circuit board 2
5 is fixed to the outer frame 21, and permanent magnets 26a, 26
b is a magnetic circuit backboard 27 fixed to the bottom of the outer frame 21;
It is mounted on top. Slit 28 in the base 24
A floodlight 29 such as an infrared light emitting diode is arranged on the magnetic circuit board 25 above the slit 28 of the toilet, and a PS
D (Po5it1on 5ensi, tive Di
A photoelectric displacement measuring device 30 such as a photoelectric displacement measuring device 30 such as ode) is disposed.

That is, when the acceleration a acts on the outer frame 21 as shown by the arrow, the pendulum consisting of the coil 23 and the base 24 tilts in the opposite direction to the acceleration a, and this deflection angle is caused by the angle of oscillation from the projector 29 through the slit 28. The amount is detected by the position on the beam displacement measuring device 30. On the other hand, the magnetic flux from the permanent magnets 26m, 26b, the permanent magnets 26m, 26b, the magnetic circuit board 25,
A closed magnetic flux loop passing through the magnetic circuit back plate 27 is formed so that magnetic flux is generated in a direction perpendicular to the plane of the coil. The polarities of the permanent magnets 261, 26b are reversed, and by passing current through the coil 23, the swing of the pendulum can be controlled according to Lemming's law. Therefore, when a current is passed through the pendulum to prevent it from swinging, a feedback current corresponding to the acceleration a is extracted, and by picking up this current, the acceleration is obtained.

FIG. 4 is a block diagram of a control device incorporated in the camera shown in FIG. 1.

In the figure, 41 is a photometric sensor consisting of a light receiving element such as an SPC for converting light passing through a photographic lens into an electrical signal;
Reference numeral 2 denotes a photometric circuit which performs temperature compensation and logarithmic compression on the signal current from the photometric sensor 41, and outputs the brightness of the object as a temperature-independent voltage signal. The photometric value (Bvo) output from the photometric circuit 42 is By(, wa By −Av□).

Bv: Actual subject brightness value Avo: F value 43 of the photographing lens is Tv・A that determines the shutter speed and aperture value
Based on the program prepared in the program section 45, the photometric value (Bv.) inputted from the photometric circuit 42 and D! The sensitivity value (S) of the film read from the Dx code 6a through the contact 7, the shutter speed (Tv) and the aperture value (A) are determined. As a program prepared in the program section 45, for example, a T-mar Av diagram shown in FIG. 6 is set. As will be described in detail later, this Tv/Ama calculation circuit 43 calculates the Tv value and Ama value set based on the log 2m of the program section 45 depending on the determination result from the image blur amount comparison/judgment circuit (described later). It is also possible to change the Tv value outside of the program, and to add the film quality factor to the changed Tv value to determine whether or not each image can be photographed.

46 is a shutter drive circuit, and Tv/Av calculation circuit 43
The driving of the shutter 58 is controlled by processing the Tv times the signal from . 47 is an aperture drive circuit, and Tv/Av calculation circuit 43
A diaphragm drive unit 1 that drives the diaphragm 15 based on the A signal from
Control 6. 48 is the acceleration sensor 2& shown in FIG.
12 b H3 & +3b is a camera shake detection means that outputs camera shake as an acceleration signal, and outputs the obtained acceleration signal to the image shake amount calculation circuit 49. The image blur amount calculation circuit 49 receives the acceleration signal from the camera shake amount detection means 48, the object distance signal from the object distance detection means 50 that detects the distance to the object, and the focal length detection means that detects the focal length of the photographic lens. The amount of image blur on the film surface is calculated using the focal length signal from 51. Here, calculation of the amount of image blur will be explained based on FIG. 5.

Since the object distance is sufficiently larger than the focal length f of the lens, the lateral magnification is set to β-f/b. Also, since the blur angle is sufficiently small, the amount of large blur X on the film surface is expressed by the following equation.

1""j+k
, 3b. The amount of image blur mentioned above is caused by rotating the camera in the y-axis and y-axis directions, but shifting in the X and 7-axis directions also causes blurring, but a simple experiment shows that Since the case where the subject distance is 2fn or more can be ignored, it is omitted here.

The image blur amount calculating circuit 49 starts calculating the amount of image blur when the first stroke switch 5WIt of the release button 4a is turned on, and stops calculating the amount of image blur when the second stroke switch SW2 is turned on.

Then, the calculated value of the amount of image blur within a certain period of time (100 m5 in this embodiment) before turning on the second stroke switch 8W2 is stored in the image blur amount storage circuit 52. 53
is an image blur amount dividing circuit which divides the image blur amount within a certain period of time stored in the image blur amount storage circuit 52 in time series according to the time equivalent to shutter seconds set in the TV-A camera calculation circuit 43. , the absolute value of the difference between the maximum and minimum amount of image blur within each divided time is calculated. In this embodiment, since the recording time of the image blur amount stored in the image blur amount storage circuit 52 is 100 m5, the image blur amount division circuit 53 divides the amount of image blur by the time equivalent to the number of seconds.
For 30, divide into 3, for 1/60, divide into 6, 1/125
In this case, it is divided into 12 parts. The image blur amount calculated by the image blur amount calculation circuit 49 changes as shown in FIG. 7, for example, and the portion surrounded by diagonal lines in FIG. 7 is stored in the image blur amount storage circuit 52. FIG. 8 is an enlarged view of the stored image shift amount. Then, the stored image blur amount is divided in time series by the shutter speed equivalent time set by the image blur amount dividing circuit 53, and the maximum and minimum image blur amount within each divided time is divided into two. FIG. 9 shows the calculated absolute value of the difference (hereinafter this value will be referred to as the image blur value).

54 is an image blur amount comparison/judgment circuit, and an image blur amount division circuit 53
Each image blur value a(al *I&t l&3...
-an) and the reference image blur value from the reference image blur amount setting means 55 are compared, respectively. The reference image blur value only needs to be equal to or less than the image blur value allowable on the film surface, and in this embodiment, it is set to 35 in consideration of the circle of least confusion. 59 is a zoom lens drive circuit that drives the zoom lens drive unit 14;
Reference numeral 56 denotes a warning display drive circuit that drives a display 57 consisting of a liquid crystal, LED, etc. installed inside the display or on the outside of the camera to display a warning of uncontrollable conditions, and is activated by the image blur amount comparison and judgment circuit 54, respectively. In addition, the warning display drive circuit 56 is also activated by instructions from the TV/Ama calculation circuit 43.

Here, the function of the image blur amount comparison and determination circuit 54 and the operation of the system based on the determination result will be explained.

The image blur amount comparison and determination circuit 54 receives the image blur value a (aI s&2 e...radius) from the image blur amount division circuit 53, and
The reference image blur values from the reference image blur value setting means 55 are compared, and if all the image blur values are a≦b, the same T value as the set T value is output, and this is used as the Tv-A value. It is output to the arithmetic circuit 43. In addition, in the case of one of the blur values a) and b, the image blur amount dividing circuit 53 divides the T value by one step and the time equivalent to the shutter time (for example, if the TV is 1/60, the T 1/125.12 division) is instructed. After the re-division instruction, the image blur amount division circuit 53
The image blur value a' obtained from the image blur amount comparison judgment circuit 54
is inputted again, and the image blur value a' is compared again with the reference image blur value. Here, if a'≦b, TV shout Tma+1 is output to the TV/Ama calculation circuit 43, and if a')b, the above is repeated.

Next, the operation of the Tv/Ama calculation circuit 43 when the image blur amount comparison/judgment circuit 54 outputs the value of Tma+n will be described.

When the value of TvxmTma+n is inputted to the Tv・Ama calculation circuit 43 from the image blur amount comparison/judgment circuit 54, Tv-A
In the camera arithmetic circuit, program shift processing and film latitude processing are performed by re-adjusting the aperture.

■Program shift processing by re-drawing the iris This process is performed when the value of T-mar T-ma + Difficult is input! shutter drive circuit 4 without being restricted by the program of program section 45.
6 outputs the value of T mark T+n, and the value of A mark A mark n is output to the aperture drive circuit 47.

In other words, by reducing the number of steps of the aperture value by the number of steps n increased by the number of steps of the shutter speed, the exposure of the subject is maintained normally within the image blur tolerance range, and the photographer's shooting intention (in this case, the program It becomes possible to take pictures in a state similar to the program in section 45).

At this time, in the case of Amarn (FNQ of the photographic lens), control is not possible, and a signal is output to the warning display drive circuit 56 to drive the display 57 to issue a warning.

■ Film latitude processing This process determines the aperture value by taking into account the film latitude code read from the DX code 6a. For example, if the film latitude code is -4 compared to the film sensitivity, -1 Since it is possible to allow an increase in the T value or the A value up to the maximum value, if TvmTma+1 is output from the image blur amount comparison/determination circuit 54, the shutter drive circuit 46 outputs Tma+1, TvmTma+1,
Outputs the aperture drive circuit 47KA. Therefore, in this case, it is possible to take a photograph with image blur within an allowable range without changing the aperture effect.

In addition, even in the case of Amarn (Amar.), if the number of increasing steps n of the Tv value is equal to the allowable range on one side of the film latitude, the shutter drive circuit 46 has Tma+h, and the aperture drive circuit 4
A ma at 7. -〇 is output, and if the allowable range on one side of the film latitude chain is large for the increasing stage n of the T value, the shutter drive circuit 46 is set to T+n1, and the aperture drive circuit 47 is initialized within that allowable range. A value as close to the A value as possible is output without exceeding the A value set.

If the film is out of the range of the film latitude crystal, the display 57 is driven to display a warning in the same way as in the program shift process described above.

The above is a description of the operation of the Tv/Ama calculation circuit 43 when the value of Tmar Tv+n is output from the image blur amount comparison/determination circuit 54. Furthermore, in this embodiment, a focal length changing process is provided as a method for preventing image blur), and this process will be described in detail below.

■ Focal length change processing When the value of ma + n is output from the image blur amount comparison and determination circuit 54, this process looks at the lens distance from the lens distance detection means 51, and if it is on the telephoto side, changes it to the wide-angle output a signal to the zoom lens drive circuit 59 in order to change to the side,
Power is supplied to the zoom lens driving section 14 described above to change the lens focal length. Then, the image blur amount is calculated again using the changed f value in the image blur calculation circuit, and the image blur amount memory storage circuit 5
The program unit 45 calculates the amount of image blur stored in step 2.
The image blur amount division circuit 53 performs division in the same manner as in the above case using a time corresponding to the shutter time set based on the program. Then, the obtained image blur value a is compared with a reference image blur value in an image blur amount comparison/judgment circuit 54, and if a≦b, the image blur value is set and the 9T-ma value and human-ma value are re-outputted. This is K
Additionally, it is possible to take photos with the amount of image blur within an acceptable range without changing the shutter speed or aperture value.

If the lens focal length is at the wide-angle end or at the wide-angle end but the amount of blur is unacceptable, the signal is output to the warning drive circuit 56 and the display 57 is driven to display a warning in the same way as described above.

In this embodiment, when the value of T mark T mark + n is output from the image blur amount dividing circuit 53, program shift processing t- is first performed by resetting the aperture. Perform laticade processing and then
If photographing is not possible even with this processing, focal length changing processing is performed, and when photographing is not possible even with this focal length changing processing, the display 57 is driven to display a warning.

The order of each process here is (1) framing, (11) proper exposure, Qj) aperture,
It should be noted that this is a shutter effect and is not necessarily absolute.

58 is a shutter, and as mentioned above, the T value is sent to the shutter drive circuit 46, and the Av-Av is sent to the aperture drive circuit 47. The value of Tv is output and the shutter 58 runs at the set Tv value. At this time, a shutter running start signal is output from the shutter 58 to the image blur amount calculating circuit 49, and after the preliminary running time of the shutter has elapsed, calculation of the image blur amount is started, and the calculated image blur amount is stored in the image blur amount storage circuit 52. Output. When the shutter completion signal from the shutter 58 is input to the image blur amount storage circuit 52, the data in the image blur amount storage circuit 52 is stored and held.

In this case, the data stored is the amount of image blur from the start of storage to the time after subtracting the margin travel time of the shutter before the shutter completes its travel, and the data stored from the start of storage until the shutter completes its travel. The data obtained by subtracting the data corresponding to the shutter margin running time is stored and held. Incidentally, since the preliminary running time and extra running time of the shutter are short, data from the start of the shutter running until the completion of running of the shutter may be stored and held.

By the way, the data stored and held in the image blur amount storage circuit 52 while the shutter is running is output to the image blur amount division circuit 53, but here, the data is stored and held in the image blur amount dividing circuit 53, but here, the data is determined based on the fastest time in seconds at which the shutter is fully open (hereinafter referred to as fully open seconds). Compare the shutter speed (called the full-open speed) with the set shutter speed (using the ICKS method). If e (full-open speed) ≧ d (set shutter speed), the number of divisions N is N-1, and e (d of If the case is expressed as dsmc++n(mml, 2-), the number of divisions N is N-2m, and the amount of image blurring during shutter movement is divided in time series.

Then, the image blur amount is divided by the image blur amount dividing circuit 53 and is calculated from the difference between the maximum value and the minimum value of the image blur amount (the image blur value in this case is the image blur value a before shutter movement described above). The image blur amount comparison/judgment circuit 54 compares e with the reference image blur value. The drive is controlled and displayed to prompt the photographer to take another picture because the picture taken is blurry. In addition, in order to distinguish from the above-mentioned warning before the shutter is running, the above-mentioned warning may be caused by blinking the display 57, and the warning while the shutter is running may be caused by lighting the display 57. Naturally, it is also possible to change the displayed content.

Further, the display may be turned on when it is determined that photographing is not possible in the program shift process, that photographing is not possible in the film latitude process, or that photographing is not possible in the focal length change process.

Next, the operation of the camera having the nine configurations described above will be explained with reference to the flowchart shown in FIG.

The operation in the above configuration will be explained. Camera body 1
It is assumed that a 35-70/F2.8 photographic lens, e18, is attached to the camera, and that the program section 45 of the camera has an exposure program diagram set as shown in FIG. This camera has film Nojatrone (DI mark attached l5O10).
0 Huh? ? By attaching the needle 4), the signal of 15O100 and the signal of -1 relative to the film sensitivity are transmitted from the fi Dx code 6 & to the Dx contact 7.
It becomes possible to supply the voltage to the v-A calculation circuit 43. Next, power switch
(not shown), the camera system including this system enters a standby state. and,
By pressing the first stroke switch SWl, photometry and camera shake amount measurement are started. For example, Bma. -2, the S value (sv-5) from Dx code 6a and the program diagram 45 indicate fiT mark 6 (1/60) A mark 4 (FM.

-4). Next, we will discuss the measurement of the amount of image blur.

Signals from the acceleration sensor 3a and the acceleration sensor 3b are input to an image blur amount calculation circuit 49. The image blur calculation circuit 49 weights the difference between the acceleration sensor 3a and the acceleration sensor 3b in a preset manner by including the signal from the lens focal length detection means 51, integrates this twice, and calculates the image on the film surface. It is output to the image blur amount storage circuit 52 as the amount of blur. In the image blur amount storage circuit 52, the image blur amount calculation circuit 4
The signals from 9 are stored for the Zoomg time and are sequentially updated with new signals.

The update stops when the second stroke switch SW2 is turned on, and 100 seconds before the second stroke switch SW2 is turned on.
Image blur amount data of ma is stored and held. This is done in the same way for the acceleration sensor 2a and the acceleration sensor 2b, and 100m before the second stroke switch 5W2 is turned on.
5Of-evening is stored in memory.

Next, when the second stroke switch SW2 is turned on, the image blur amount division circuit 53 compares the amount of blur with the set Tma value. FIG. 7 is a graph obtained by measuring and converting the amount of blur on the film surface from the difference between the acceleration sensors 3& and 3b. FIG. 8 shows data in the image blur amount storage circuit 52 when the second stroke switch seat is turned on at time a in FIG. Here, since the T marker 6 is output from the Tv/A marker calculation circuit 43, the Zoom data is divided into six, and each divided image blur value a(al, a2 ・
...a@) and outputs it to the image blur amount comparison/determination circuit 54. Then, it is compared with the reference image blur value b (here, 35c) from the reference image blur amount setting means 55. As can be seen from Figure 9, for 35 birds, three of the six divisions are over. In this case, the image blur amount dividing circuit 5
In step 3, the value of Tma+1-7, that is, 12 divisions is performed, and the image blur amount comparison/determination circuit 54 compares it with a reference image blur value b (35 μm).

As shown in Fig. 9, in this case it can be seen that all the ropes are 35 ropes or less.

At this time, data from both of the acceleration sensors 2a, 2b, 3m, and 3b are compared and determined, and a new Tv value is output based on the value with the larger amount of blur. Here, the image blur amount comparison/determination circuit 54 outputs the value of Tma+1 to the Tv/Ama calculation circuit 43, and the Tv/Ama calculation circuit 43 performs a program shift process, and the value of A marker 3 on the same E marker line is calculated by ignoring the program shown below. This causes the shutter drive circuit 46 to receive Tv=7. A mark A to the aperture drive circuit 47. -0 is output, the mirror moves up according to the camera sequence, and the diaphragm drive unit 6 moves to A mark. - Set the aperture to O, and the shutter is 1/125 (T
v=7).

Next, a case will be described in which the signal from the image blur amount comparison and determination circuit 54 is outside the control range of the camera. Similarly to the above, the photometering circuit 42 and the frame B are connected. Assume that a signal of −6 is given. However, here it is assumed that the amount of blur is large and the signal Tvm8 is output from the image blur amount comparison/determination circuit 54 to the Tv-Ama calculation circuit 43.

The Tv-A calculation circuit 43 calculates A from the same Ev line in FIG.
Calculate Mar2. However, the attached lens is A. At -3, it becomes uncontrollable. In this case, the latitude from the Dx code 6a can be tolerated up to 11 steps by comparing the signals of +3 and - with respect to the film sensitivity, so Tv=8. A signal Av@-0 is output to the aperture drive circuit 47.

Next, when the amount of blur is large and the signal of the T-mar 9 is outputted from the blur amount comparison/judgment circuit 54 to the A-ma calculation circuit 43, the Tv-A-ma calculation circuit 43 uses the E-ma Calculate Amer 1 from the line. In other words, even if the latitude from Dx code 6a includes a signal for film sensitivity, it is outside the aperture control range of the attached lens.If it is determined that photography is not possible even with 6-film latitude processing, the focal length will be changed. Processing is performed. When this process is instructed, it is determined whether the lens is on the telephoto side or the wide-angle side by checking the value of the lens focal length detection means 51, and if it is on the telephoto side, it is output to the zoom lens drive circuit 59, and the value is output to the zoom lens drive circuit 59. to drive it to the wide-angle end. By driving to the wide-angle end, the signal of the lens focal length detection means 51 is changed, and the data in the image blur amount storage circuit 52 is calculated again using this value, and the data in the image blur amount storage circuit 52 is rewritten. Then perform blur division,
The T-ma value is determined by comparing it with the reference image blur value (at this time, T-ma 8). If it is determined that the image blur is tolerable based on this T-ma value, the aperture and shutter are driven. . Furthermore, if it is determined that the image blur is unacceptable, the output to the shutter drive circuit 46 and the aperture drive circuit 47 is stopped,
The signal is output to the warning display drive circuit 56 to drive and control the display 57 for display.

Next, when the shutter is running, Tv=T is sent to the shutter drive circuit 46 as described above, and A mark is sent to the drive circuit 47. ! 0
The signal is output and the shutter B aperture is driven. When the shutter travels, the amount of blur is calculated at the start of the shutter travel, and the amount of blur is stored and held at the destination of the shutter travel.

By dividing this data and comparing it with the standard amount of shake, it is determined whether the amount of shake when the shutter is running is within the allowable amount of shake,
If the amount of shake is larger, a warning will be displayed.

At that time, if the shutter setting time d is larger than the fully open time C, for example d-8,6m5, the stored data is divided into 2-4 parts and the peak (maximum value) of the amount of blur in each division is calculated. ) - Image blur values are calculated from the peaks (minimum and minimum values), and if e≦b (reference image blur value), the shooting is judged to be "good", and if .>b, image blur has occurred. A warning will be issued.

Further, in the case of d≦C, the stored data is divided into one part, and the image blur value .multidot. is calculated from the beak-to-beak, and the same determination as above is made.

〔Effect of the invention〕

As explained above, according to one aspect of the present invention, it is determined whether camera shake during shutter operation causes image blur or not, and when it is determined that image blur has occurred, a notification means such as a lamp or the like is activated. Since the camera can be activated and notified to the photographer, the photographer' can take the picture again and get the perfect picture, and also saves on film by not having to take more pictures than necessary. You can get the same effect.

[Brief explanation of drawings]

FIG. 1 is a perspective view showing an embodiment of the camera according to the present invention;
Fig. 2 is a cross-sectional view, Fig. 3 is a partially cutaway perspective view of the acceleration sensor, Fig. 4 is a block diagram, Fig. 5 is a diagram showing the relationship between camera shake amount and image blur amount, and Fig. 6 is a T Fig. 7 is an image blur waveform diagram, Fig. 8 is a partially enlarged view of the image blur waveform diagram, Fig. 9 is an image blur division diagram, and Figs. 10 (a) and (b) are flowcharts. It shows. 1: Camera body 2m, 2b, 3m, 3b: Acceleration sensor 4 clip 5: Camera contact 6: Film cartridge 7: D! Contact 41: Photometric sensor 42: Photometric circuit 43; Tv-A camera calculation circuit 45 Niprogram unit 46: Shutter drive circuit 47: Aperture drive circuit 48: Camera shake amount detection means 49: Image shake amount calculation circuit 50: Subject distance detection means 51: Lens focal length detection means 52: Image blur amount storage circuit 53: Image blur amount division circuit 54: Image blur amount comparison judgment circuit 55: Reference image blur amount setting means 56: Warning display drive circuit 57: Display 58: Shutter 59: Zoom lens drive circuit Figure 1 Figure 3

Claims (1)

[Claims] Camera shake amount detection means for detecting the amount of camera shake from acceleration; image shake amount calculation means for calculating the amount of image shake on the film surface based on the amount of camera shake detected by the camera shake amount detection means; and notification means for notifying image shake. connected to,
Compare the image blur value obtained from the difference between the maximum value and the minimum value of the image blur amount in a predetermined time from the image blur amount calculating means during shutter operation with a reference image blur value set in advance at which image blur is tolerable. and means for activating the notification means when the image blur value is larger than the reference image blur value.