JPH085464Y2 - camera - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to a camera, and more particularly to a camera having a camera shake prevention function for preventing camera shake photography due to shutter release operation of the camera during photography.

[Prior Art] As is well known, when a photograph is taken by a camera, when the shutter release button is pressed, the pressing force is transmitted to the camera body to move the camera body, which may cause so-called hand-shake photography.

The amount of blurring varies depending on whether or not the user has taken a picture, and in particular, for beginners, a large amount of blurring often occurs depending on how to hold the camera and how to press the release button. Further, this camera shake often occurs at a low shutter speed of, for example, 1/30 second or 1/60 second in combination with instability of holding the camera.

Therefore, conventionally, as a means for preventing this camera shake, a tripod is used to fix the camera for photographing, or the shutter speed is increased to prevent it.
For example, if the shutter speed is set to 1/125 seconds or more, camera shake will not occur. Further, in recent years, in the case of photographing at a shutter speed where hand shake is likely to occur, there has been proposed a device in which a delay circuit is used to start the exposure after the influence of the release button operation is subsided.

That is, in the shutter release device for a small camera described in Japanese Patent Laid-Open No. 53-131834, when the shutter speed is likely to cause camera shake, pressing the release button causes delay control means to work, and then the shutter is released. In the camera shake prevention device for a camera disclosed in Japanese Patent Laid-Open No. 55-133022, the shutter release button is pressed when the camera shake is likely to occur.
After the pressing force is released from the button, the exposure is started after a predetermined time has passed. Furthermore, in the image pickup apparatus disclosed in Japanese Patent Laid-Open No. 63-129331, the release button is pressed to detect the amount of camera shake and control the time until the start of shooting.

Furthermore, recently, a device has been proposed in which a shake correction amount is detected by a gyroscope, a CCD sensor, an acceleration sensor, or the like, and a correction optical system is moved by an actuator to perform image stabilization.

[Problems to be solved by the invention] However, the conventional means for using a tripod has the trouble of always carrying the tripod together with the camera, and the means for increasing the shutter speed needs to use a high-sensitivity film or a bright lens. However, there is a problem that it is very difficult for general users to use.

Further, in the image stabilization technology using the delay means disclosed in Japanese Patent Laid-Open No. 53-131834, etc., the delay means works only by the information on the shutter speed, so camera shake due to the pressing of the release button does not occur much. For advanced users such as professional photographers who have skilled technology, since it only lengthens the release time lag, there is no effect,
On the contrary, the operation feeling is impaired.

In addition, the means using a gyro requires the gyro to be rotated, which is a large and complicated anti-vibration device, which is expensive and impractical, and uses a CCD sensor to detect camera shake. However, there is a problem that the motion of the subject cannot be distinguished from the camera shake, and the sample period needs to be long to some extent.

Further, the means using the acceleration sensor also has variations in measurement accuracy due to temperature changes and the like, and there is a problem in the phase shift generated when converting to speed and displacement and the stability of the converted signal. It is difficult to instantly obtain velocity signals and displacement signals. There is also a problem that the correction optical system and the actuator for moving the correction optical system require large responsiveness and resolution, and thus become a large-scale device.

On the other hand, in the recent fully automatic cameras, the shutter release button can be operated in the first-stage half-pressed state and the second-stage fully-pressed state, and the first switch is turned on to turn on the first switch. When the release signal is output, the photometry and the distance measurement are performed, and the second switch is fully pressed to turn on the second switch to drive the shutter and start the exposure of the film. However, there is a difference in how to press the shutter release button for turning on and off the first and second switches depending on whether or not there is a wealth of experience in photography.

That is, a person who is relatively accustomed to taking a picture does not press the shutter release button at a stretch but performs a so-called first-stage release half-press operation to adjust the exposure and focus in advance, and then take a breath. Then, the full-press operation of pressing all the release buttons in the second stage is performed.

On the other hand, people who are not accustomed to taking photographs tend to push the shutter release button all at once at the moment when they decide the composition.

Experiments have revealed that such a difference in how the release button is pressed causes a difference in the amount of camera shake that occurs during actual shooting. FIG. 10 shows changes in the amount of camera shake under certain conditions before and after the release in the second stage, that is, before and after the second release.

Here, the photographer A indicates a beginner who has little experience in photography, and the photographer B indicates an experienced advanced person. As is clear from FIG. 10, it is understood that the blur amount of the photographer A rapidly increases after the second release, but falls to a level equivalent to that of an advanced person after 0.2 seconds. Further, it is understood that the photographer B has hardly changed before and after the release.

On the other hand, regarding the time period during which the second switch is in the “ON” state due to the full-pressing in the second step described above, the difference between those with and without experience in photography is that advanced users should firmly hold until the end of exposure. The second switch is "on"
In contrast to this, a beginner who is inexperienced in photography tends to release the release button as soon as the second switch is turned on and exposure of the film is started.

Then, considering the transition of the amount of camera shake before and after the release due to the difference in the way the camera is held, this is as shown in Fig. 11, when the camera is held in the vertical position, the horizontal position is changed to the horizontal position. It has been clarified as a result of an experiment that the effect of camera shake due to the release button pressing operation is larger than that in the shooting state.

Therefore, the object of the present invention is to use a simple and inexpensive structure without using a complicated and expensive mechanism unlike the above-mentioned conventional ones, so that even a beginner who is inexperienced in photography can take a picture with less shaking like an advanced person, It is also intended to provide a camera that does not impair the operation feeling for advanced users.

[Means for Solving the Problems] The camera according to the present invention detects the start of the operation of the release button and outputs a first release signal, and first release detecting means for instructing the start of exposure on the imaging surface. The second release detecting means for detecting the depression of the release button for outputting the second release signal and the time from the time when the first release signal is output until the second release signal is output When the time measuring means and the time measured value of this time measuring means are smaller than a predetermined value,
Delay means for delaying a predetermined time from the time when the second release signal is output to the exposure start time, and a time measuring means for measuring the time during which the second release signal is in the ON state, Alternatively, it has a sensor that detects the attitude of the camera at the time of shooting or a pressure sensor that measures the pressing of the release button, and from the time when the second release signal is output to the exposure start operation according to the measured time and sensor output. It is characterized in that it is provided with a delay means capable of varying the time.

[Operation] The present invention measures the amount of camera shake caused by the pressing operation of the release button and the holding method by measuring the pressing time of the release button by the photographer, the individual difference in the pressing, and the posture (vertical position / horizontal position) of the camera. If you anticipate that camera shake will occur significantly, delay the time from the release button pressing operation to the start of exposure until the effect of camera shake caused by pressing the release button is reduced, and take a picture. I made it possible to take pictures with little camera shake even for beginners with little experience.

[Embodiment] Hereinafter, the present invention will be described with reference to an illustrated embodiment.

FIG. 1 is a schematic configuration diagram of a camera showing a first embodiment of the present invention, and FIGS. 2 and 3 are a block configuration diagram and a time chart of a specific electric circuit thereof, respectively. is there.

When the shutter release button 1 is pressed, the first switch 2 is turned on in conjunction with the first half-pushed state of the shutter release button, and the first release signal is input to the timing means 4. Next, when the release button 1 is pushed deeper than the first stroke to be in the full-pressed state in the second stage, the second switch 3 is turned on in this state of the second stroke, and the second release signal is input to the timing means 4. When the photographer judges that he / she has expressed his intention to take an image, he / she prepares to start exposure on an image pickup surface such as film.

The clocking means 4 is means for measuring the time from when the first switch 2 is turned “on” until when the second switch 3 is turned “on”, and the output of the clocking means 4 is input to the delay means 5. . The delay means 5 serves to variably delay the time from when the second switch 3 is turned “on” by the output of the timing means 4 to when the shutter is opened to start exposure on the image pickup surface. Exposure means 6 according to the output from 5
Operates to start exposure.

FIG. 2 is a block diagram showing a concrete configuration of the time measuring means 4 and the delay means 5, and is shown in FIG.
The output of the shutter time setting means 7 in which the shutter time is set by the AE (photometric) circuit is the CPU (central processing) together with the first release signal from the first switch 2 and the second release signal from the second switch 3. Device 8). The CPU8 performs timer control, shutter control and arithmetic processing.
A ROM (read only memory) 9 for storing U programs and data, a first timer 10, a second timer 11, and a shutter controller 12 are connected to each other.

The first timer 10 measures the time from when the first switch 2 is “ON” to when the second switch 3 is “ON” and when the second switch 3 is “ON” to “OFF”. measure. The second timer 11 serves to measure the timer lag calculated by the CPU 8, that is, the delay time. In the present embodiment, the timer lag is selected by the CPU 8 to be any one of 0 to 0.3 seconds.

Regarding the operation of the first embodiment configured as described above
Referring to the time chart of the figure and the flowchart of FIG. 4, the shutter release button 1 will be released by the photographer.
When is pressed and the first switch 2 is turned “on” by the half-pressing operation in the first stage, the first release signal is issued and the time counting means 4 starts the measurement. After that, when the photographer further presses the release button deeper to perform the full-press operation in the second stage, the second switch 3 is turned “on”, the second release signal is issued, and the measurement by the timing means 4 is completed. Then, the time measuring means 4 inputs the output obtained by measuring the time from when the first switch 2 is turned on 1 until the second switch 3 is turned on to the delay means 5.

Then, in the delay means 5, the first switch 2 is turned “on” by the output of the timing means 4 and then the second switch 3 is turned on.
If the time until "ON" is shorter than a certain set time, it is determined that the photographer has pressed the release button 1 all the way to the fully pressed state, and the shutter is released after the second switch 3 is turned on. The time until opening is delayed by the built-in time lag variable circuit, and then the exposure unit 6
To work. Therefore, since the shutter operation is performed after the camera shake is suppressed, the amount of camera shake is reduced to that of an advanced person.

Further, when the output of the timekeeping means 4 is longer than a certain set time, it is determined that the amount of camera shake is not too large, and the exposure means 6 is operated immediately after the second switch 3 is turned "on" to release the shutter. The time lag variable circuit of the delay means 5 is set to open. Therefore, for advanced users, by reducing the time lag, that is, the delay time, it is possible to perform shooting without a sense of discomfort.

5 to 7 show a second embodiment of the present invention. In the camera of the second embodiment, the time during which the second switch 3 is on is measured to eliminate the instability of pressing the release button 1 due to the presence or absence of photography.

That is, as shown in FIG. 5, the schematic construction of the camera of the second embodiment is such that photometry is performed by the first release signal when the first switch 2 is turned "on" in the half-pressed state of the first step of the shutter release button. The distance measuring means 13 is operated, and the second switch 3 is turned “on” in the fully pressed state of the second stage so that the time measuring means 14 measures the time during which the second switch 3 is in the on state. It has become. In the delay means 15, the time lag variable circuit controls the time from the turning on of the second switch 3 to the opening of the shutter to start the exposure of the image pickup surface such as a film by the output of the time measuring means 14.

Further, the specific constructions of the time measuring means 14 and the delay means 15 in the second embodiment are substantially the same as those shown in FIG. 2, and the operation is also shown in the time chart shown in FIG. 6 and FIG. It is as shown in the flow chart. That is, the difference from the first embodiment is that when the time during which the second switch 3 is in the "ON" state due to the output of the timing means 14 is shorter than a certain set time, the release button 1 The delay means 15 extends the time from when the second switch 3 is turned on to when the shutter is opened, because it is determined that the amount of camera shake will increase due to the immediate release of the shutter. By doing this, the amount of camera shake will fall within the level of advanced users.

Although two timers are used in this second embodiment, it is needless to say that one timer is sufficient.

FIG. 8 shows a third embodiment of the book. In the third embodiment, the influence of camera shake due to the difference in how the camera is held at the time of shooting is eliminated. That is, as described above with reference to FIG. 11, the effect of camera shake caused by the release pressing operation is greater when the camera is held in the vertical position during shooting than when the camera is held in the horizontal position.

In the third embodiment, the posture detection sensor 16 for detecting the vertical or horizontal position of the camera is used to detect whether the photographer is shooting in the vertical position or in the horizontal position. The time lag variable circuit of the delay means 17 controls the time from when the second switch 3 is turned on by the output of the attitude detection sensor 16 to when the shutter is opened and the exposure of the image pickup surface is started. .

Therefore, in the third embodiment, if the output of the attitude detection sensor 16 detects that the camera is in the vertical position, the amount of camera shake is determined to be large, and the shutter is opened after the second switch 3 is turned on. By extending the time up to the time by the delay means 17 of the time lag variable circuit, the amount of camera shake can be set to the level of shooting in the horizontal position.

FIG. 9 shows a fourth embodiment of the present invention. In the fourth embodiment, a pressure sensor 18 that measures the force applied to the camera when the photographer presses the release button 1 is used, and the output of the sensor 18 is set to "ON" the second switch 3 before the shutter is released. The delay means 19 controls the time from opening to the start of exposure on the photographing surface.

The fact that the release pressing operation affects the camera shake is as described above, but the release pressing operation is not only the speed with which the release button is pressed, but also the power with which the photographer presses the release button. Also has been found to affect camera shake.

Therefore, in the fourth embodiment, the output of the pressure sensor 18 is amplified by the voltage amplifying circuit 20, and this output is input to the delay means 19, so that the output of the pressure sensor 18 gives the photographer a large amount of force to press the release button. If it is detected that the amount of blurring is large, the amount of camera shake is reduced by extending the time from when the release switch 2'is turned on to when the shutter is opened by the delay means 19 such as a time lag variable circuit. It is designed to fit within the shooting of an advanced person. When the release switch 2'is turned on, the photometry / distance measuring means 13 is activated.

In the present embodiment, the delay time until the opening operation of the shutter is determined only by the output of the pressure sensor that detects the pressing of the release button. However, the delay time is not limited to this, and as described in other embodiments, for example, the release may be performed. It goes without saying that the present invention can be applied to a camera that determines the delay time by combining the signal interval, the attitude detection sensor, the subject brightness information, the set shutter speed, and the like.

[Advantages of the Invention] As described above, according to the present invention, the blurring due to "how to press the release button and how to hold the camera", which is a major factor of camera shake caused by the difference in experience of taking pictures, is very simple. It is possible to reduce the amount of camera shake even for beginners who are inexperienced in photography, and to predict the amount of camera shake by pressing the release button, which makes it possible for advanced users who are less likely to experience camera shake. It is possible to provide a camera with less release time lag without impairing it.

[Brief description of drawings]

FIG. 1 is a schematic configuration diagram of a main part of a camera showing a first embodiment of the present invention, and FIG. 2 is an electric circuit block diagram showing a concrete configuration of a clock means and a delay means in FIG. 3 and 4 are a time chart and a flow chart showing the operation of the camera of the first embodiment, and FIG. 5 is a schematic configuration diagram of a main part of the camera showing the second embodiment of the present invention, FIG. And FIG. 7 is a time chart and a flow chart showing the operation of the camera of the second embodiment, FIG. 8 is a schematic configuration diagram of the main part of the camera showing the third embodiment of the present invention, and FIG. FIG. 10 is a schematic diagram showing a main part of a camera showing a fourth embodiment of the invention, FIG. 10 is a diagram showing a difference in pressing operation of a release button due to a difference in experience of photographing, and FIG. FIG. 6 is a diagram showing a difference in release button pressing operation between a case of holding and a case of holding in a horizontal position. 1 ... Release button 2 ... First switch (first release detecting means) 3 ... Second switch (second release detecting means) 4,14 ... Time measuring means 5,15,17,19 ... Delaying means 16 ...... Attitude detection sensor (attitude detection means) 18 …… Pressure sensor (pressure detection means)

Claims (4)

[Scope of utility model registration request] Claim: What is claimed is: 1. First release detecting means for detecting the start of operation of a release button and outputting a first release signal, and detection of depression of a release button for instructing start of exposure on an image pickup surface. A second release detecting means for outputting a second release signal, a time measuring means for measuring a time from the time when the first release signal is output to the time when the second release signal is output, and a time measured value of the time measuring means. When is smaller than a predetermined value, the camera further comprises: delay means for delaying a time from the time when the second release signal is output to the exposure start time by a predetermined time. 2. A release means for outputting a release signal for instructing the start of an exposure operation on an image pickup surface when operated, and a time period during which the release signal is output by the release means. The time measuring means and the time from the time the release signal is output by the release means to the start of exposure are delayed until the measured value of the time measuring means reaches a first predetermined value, and the measured value of the time measuring means is When it is smaller than the first predetermined value, delay means for delaying the time from the time when the release signal is output by the release means to the start of exposure to a second predetermined value which is longer than the first predetermined value, A camera comprising: 3. When operated, a release button for outputting a release signal for starting exposure of an image pickup surface, a posture detecting means for detecting a posture of the camera body with respect to gravity, and an unstable camera body. A camera, comprising: a delay unit that delays a time period from the output of the release signal to the start of exposure by a predetermined time when the posture detection unit detects that the posture is maintained. 4. A release button, which is operated to output a release signal for starting exposure of an image pickup surface, and a release button provided at a final end of an operation stroke of the release button.
A pressure detecting means for detecting the pressure when the release button abuts, and a delay for delaying the time from the output of the release signal to the start of exposure by a predetermined time when the detected value of the pressure detecting means is a certain value or more. A camera comprising means and.