JPH07199307A - Camera capable of detecting difference in posture - Google Patents

Abstract

PURPOSE:To simplify the structure of a posture difference detecting device and to miniaturize a camera by providing a posture difference calculating means calculating the posture of a camera main body for every interval at a unit-time and calculating a difference in the posture of the camera main body. CONSTITUTION:A horizontal direction sensor 12A detecting a change in the posture in a horizontal direction and a posture detecting sensor 12B detecting the change in the posture in a vertical direction are incorporated and when the camera 24 is inclined by an inclination angle theta1, the posture detecting sensor 12 incorporated in the camera 24 is inclined by the inclination angle theta1 as well. Therefore, reaction force generated on a pressure sensitive sheet 22 becomes reaction force N1' at a contact point 14 and reaction force N2' at a contact point 15 and the reaction force corresponding to the inclination angle is generated on the pressure sensitive sheet 22 at respective contact points 14 and 15. The reaction forces generated at respective contact points 14 and 15 are sequentially inputted to a CPU from the sheet 22 of the posture detecting sensor 12B every specified time and the inclination angle theta1 of the camera is calculated based on the inputted reaction forces N1' and N2'. The inclination angle alpha1 can be easily obtained from the difference between the reaction forces N1' and N2' by a proportional calculation.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a camera capable of detecting a posture difference, and more particularly to a camera capable of detecting a posture difference for detecting a temporal change of the posture of the camera.

[0002]

2. Description of the Related Art Conventionally, a vertical position sensor in which mercury is enclosed in a glass tube is known as a device for detecting the attitude of a camera. This vertical position sensor detects that the mercury inside the glass tube moves when the camera is held from the horizontal position to the vertical position and that the contacts inside the glass tube are conducted by the mercury, and it is determined that the camera is in the vertical position. To do. This is because the exposure metering output, which is a method of exposure control used in recent single-lens reflex cameras, switches the metering output for evaluation metering from the pattern for horizontal position to the pattern for vertical position, and it is accurate even when the camera is held in vertical position. This is for enabling various evaluation photometry. On the other hand, it has been proposed to use an acceleration sensor, a vibration sensor, or the like as a sensor for detecting camera shake.

[0003]

However, in the case where the camera-shake preventing device is incorporated in the 35 mm camera by utilizing the acceleration sensor and the vibration sensor described above, there is a problem that the structure becomes complicated and the camera becomes large in size. is there. That is, a space is required to newly install an acceleration sensor, a camera shake correction unit, and the like inside the camera, which makes it difficult to miniaturize the camera. Further, in the case of a camera capable of evaluative metering, a vertical position sensor for switching the metering output of the evaluative metering is already provided, but it is necessary to separately incorporate the acceleration sensor and the like, which complicates the structure and increases the size. Will be invited. Moreover, conventional mercury based vertical position sensors are expensive to dispose of after disposal.

An object of the present invention is to enable simplification of the structure and downsizing of a camera, and in addition to a posture sensor for detecting whether the camera is in a horizontal position or a vertical position, as a camera shake sensor for detecting camera shake. It is to provide a camera capable of detecting a posture difference that also plays a role of.

[0005]

A first solution of a camera capable of detecting a posture difference according to the present invention includes a weight and a pressure sensitive sheet, and the weight contacts the pressure sensitive sheet at at least two contact points. Then, based on the reaction force data of each contact point detected by the attitude detection sensor and the camera body that detects the reaction force at each contact point of the weight body by this pressure-sensitive sheet, Attitude difference calculation means for calculating the attitude difference of the camera body by calculating the attitude of the camera body for each unit time.

According to a second solving means, in the camera capable of detecting the attitude difference of the first solving means, when the attitude difference of the camera body calculated by the attitude difference calculating means exceeds a predetermined value, It is characterized in that it is provided with a warning means for warning that hand shake has occurred.

According to a third solution means, in the camera capable of detecting the attitude difference of the first solution means, when the attitude difference of the camera body calculated by the attitude difference calculation means exceeds a predetermined value, photographing is prohibited. It is characterized in that it is provided with a photographing prohibition means.

According to a fourth solution means, in the camera capable of detecting the attitude difference of the first solution means, a camera shake correction means is provided for correcting camera shake based on the attitude difference of the camera body calculated by the attitude detection sensor. It is characterized by that.

A fifth solution means, in the camera capable of detecting the attitude difference of any one of the first to fourth solutions, evaluates when the attitude of the camera is detected as a vertical position by the attitude detection sensor. It is characterized by further comprising switching means for switching the photometric output of photometry from the horizontal position to the vertical position, and threshold setting means for setting the predetermined value to a value for the vertical position.

[0010]

According to the present invention, the attitude detecting sensor for detecting the attitude change of the camera body is composed of the pressure sensitive sheet and the weight body, and the attitude difference of the camera is determined from the reaction force detected at each contact point of the pressure sensitive sheet. Is calculated. As a result, the structure of the attitude difference detection device is simplified and the camera can be downsized.

If the calculated posture difference exceeds a predetermined value, it is determined that the camera shake has occurred, and a warning or photographing is prohibited. Alternatively, the camera shake correction unit is driven based on the calculated attitude difference, and the camera shake is controlled so that the camera shake does not occur in the captured image. As a result, it is possible to prevent shooting in a camera shake state.

Further, the attitude detection sensor determines whether the camera is in the horizontal position or the vertical position, and the photometric output of the evaluation photometry is switched based on the result. As a result, the vertical position sensor, which was required in the past, becomes unnecessary. Further, since the threshold for determining the camera shake is changed when the camera is in the horizontal position and when the camera is in the vertical position, it is possible to more reliably prevent the camera shake.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT A camera capable of detecting a posture difference according to the present invention will be described in detail below with reference to the accompanying drawings.

FIG. 1 is a block diagram showing a circuit configuration of a camera capable of detecting a posture difference according to an embodiment of the present invention, and FIG. 2 is a posture detection sensor which is a main part of a camera capable of detecting a posture difference according to the present embodiment. FIG. 3, FIG. 3 and FIG. 4 are explanatory diagrams when the orientation of the camera is detected by the orientation detection sensor, and FIG. 5 is a graph showing the orientation change of the camera per unit time.

As shown in FIG. 1, in the camera capable of detecting the attitude difference of the present embodiment, the attitude detecting sensor 12 is mainly composed of a CPU 10 as an arithmetic means for calculating a camera shake amount (attitude difference) occurring in the camera body. A horizontal sensor 12A and a vertical sensor 12B, an input unit 16 for inputting a release signal to the CPU 10, a correction optical system 18 as a camera shake correction unit, and the like.

As shown in FIG. 2, the attitude detecting sensor 12 has a semicircular weight body 20 and a pressure-sensitive sheet 22, and the weight body 20 has its center 20A supported by a support or the like. As a result, the weight body 20 is in contact with the pressure sensitive sheet 22 at the two contact points 14 and 15. These contact points 1
In Nos. 4 and 15, the weight body 20 contacts the pressure-sensitive sheet 22 with vertical reaction forces N ₁ and N ₂ , and when the pressure-sensitive sheet 22 is horizontal, the values of N ₁ and N ₂ are equal.

As shown in FIG. 3A, the camera 24 has a lateral sensor 12A for detecting a lateral attitude change.
And a posture detection sensor 12B for detecting a posture change in the vertical direction.
And are built in. Here, a case of detecting a posture change in the vertical direction will be described as an example. First, when the camera 24 is inclined by the inclination angle theta _1, the slope only orientation built into the camera 24 detecting sensor 12B also theta _1, this result, Fig. 3
Reaction force caused in the pressure-sensitive sheet 22, as shown in (B) is, N ₁ at a contact point 14 becomes ', N ₂ at contact points 15',
A reaction force corresponding to the inclination angle is generated in the pressure sensitive sheet 22 at each of the contact points 14 and 15.

The reaction force generated at each of the contact points 14 and 15 is sequentially input to the CPU 10 from the pressure-sensitive sheet 22 of the attitude detection sensor 12B every predetermined time, and the input reaction force N is input.
The vertical tilt angle θ of the camera 24 based on ₁ ', N ₂ '
Calculate ₁ . The inclination angle θ ₁ can be easily obtained by proportional calculation from the difference between the reaction forces N ₁ ′ and N ₂ ′. Further, it is determined from the tilt angle θ whether the camera 24 is in the horizontal position or the vertical position.

Then, when the posture changes from the state of FIG. 3 after a unit time and the camera 24 tilts at the tilt angle θ ₂ , FIG.
It is shown in (A). Reaction force at that time, as shown in FIG. 4 (B), N ₁ at a contact point 14 ", N ₂ at a contact point 15"
Is. The CPU 10 calculates the vertical tilt angle θ ₂ of the camera 24 based on these reaction forces N ₁ ″ and N ₂ ″.

If the angle difference at this time, that is, the attitude difference between FIG. 3 and FIG. 4 is Δθ, it is expressed by the following equation: Δθ = θ ₂ −θ ₁ (1). The resulting posture difference per unit time is also large. Figure 5
As shown in (A) and (B), when the time required for the attitude difference Δθ to reach the attitude difference Δθ is Δt, the attitude change occurring in the camera 24 is expressed as an angular velocity ω. You can Specifically, the angular velocity ω = (θ ₂ −θ ₁ ) / (t ₂ −t ₁ ) = Δθ / Δt (2)

Therefore, the CPU 10 first calculates the tilt angles θ ₁ and θ ₂ of the camera 24 from the reaction forces of the contact points 14 and 15 of the pressure sensitive sheet 22 which are sequentially input every unit time, and then, , The attitude difference Δθ and the angular velocity ω are calculated from the tilt angles θ ₁ and θ _2, and the attitude change of the camera 24 in the vertical direction is detected. It should be noted that, although the description is omitted here, the change in the posture in the horizontal direction is similar to that in the case of the vertical direction.
It is calculated based on the reaction force data.

FIG. 6 is an explanatory view showing the relationship between the focal length f (mm) and the camera shake amount ε, and the relationship between the two is as follows. In FIG. 6, according to the image formation formula, (1 / a) + (1 / b) = (1 / f) b = af / (a−f) Therefore, the camera shake amount ε that occurs when the attitude difference Δθ is ε = B · tan (Δθ) = {af / (af)} tan (Δθ) (3) Here, the distance a to the subject and the focal length f are
It is known and is input to the CPU 10 from a distance measuring means and a focal length detecting means (not shown).

The amount of camera shake ε thus calculated is CP
If the camera shake amount ε is compared with a threshold value of a predetermined value by U10 and the camera shake amount ε is larger than the threshold value, an instruction signal for correcting the camera shake is output from the CPU 10 to the correction optical system 18 shown in FIG. Generally, when a 35 mm film is used and the camera 24 shoots horizontally, the amount of camera shake is 3
When the thickness is 0 μm or less, there is no problem in actual shooting, so the threshold value is set to 30 μm in this embodiment. It should be noted that in the case of shooting in the vertical position, it is considered that there is more camera shake than in the case of the horizontal position, so this threshold value is set lower.

The correction optical system 18 is composed of a horizontal actuator 18A, a vertical actuator 18B, etc.
The optical system of the camera is driven in a direction in which the camera shake ε calculated by the equation (3) is canceled to prevent the camera shake.
Here, the correction optical system 18 is controlled based on the following values. First, the camera shake speed V of the camera 24 at the angular velocity ω is V = {af / (af)} · ω, and the lateral actuator 18A and the longitudinal actuator 18B of the correction optical system 18 are controlled by this value. .

Here, when the amount of camera shake exceeds 30 μm, the camera shake is corrected by the correction optical system 18, but it is controlled so as to prohibit photographing or warn the photographer of the camera shake. Is also possible. In the case of control that prohibits shooting, the angular velocity ω of the camera 24 is calculated before the release is performed, and this angular velocity ω is multiplied by the shutter speed T to predict the posture change at the time of release.

Specifically, FIG. 7 is an explanatory diagram for the case where the photographing is prohibited or the camera shake is warned. As shown in FIG. 7, after the switch S2 is turned on (the shutter is fully pressed), the camera shake occurs in t seconds. The amount ε ₂ is calculated by the following formula, and when the calculated ε ₂ exceeds 30 μm, a warning or a release lock instruction signal is output from the CPU 10 to a display means or a release means (not shown). Δθ = ωT = [{(θ ₂ −θ ₁ ) / Δt} · T] ε ₂ = {af / (af)} tan (Δθ)

Alternatively, when the camera shake amount ε ₃ during photographing is calculated and ε ₃ > 30 μm, it is possible to give a warning that the photographed photograph is a camera shake photograph.

Then, according to the flow chart of FIG.
An operation of the camera capable of detecting the attitude difference according to the present embodiment will be described by way of an example in which panning is performed.

First, in step # 101, when the attitude of the camera is detected based on the attitude data input from the attitude detection sensor 12 to the CPU 10 and it is determined that the camera 24 is in the lateral position, step # 101. If the processing shifts to 102 and it is determined that the vertical position is set, the flow shifts to step # 202. In step # 102 or step # 202, the switch S1 is pressed by pressing the shutter halfway.
Is turned on, and the detection of the moving direction of the camera 24 is step # 1.
03 or step # 203.

The moving direction of the camera 24 is detected from the attitude difference Δθ calculated by the above-mentioned equation (1) by the CPU 10. Then, in order to avoid deciding the movement of the camera 24 moving in the panning direction as camera shake, the camera shake in the horizontal direction in step # 104 or step # 204 or the camera shake in the vertical direction in step # 105 or step # 205. The photographer himself turns off the detection switch. Then, to the CPU 10 shown in FIG. 1, an instruction signal for not performing horizontal or vertical camera shake detection is input from the input unit 16.

After S2 is turned on (the shutter is fully pressed) in step # 106 or step # 206, step # 107
Alternatively, the process proceeds to step # 207, the shake calculation is performed based on the equation (3), and the calculated shake amount ε is calculated by the CPU 1
It is compared with a threshold η by 0. If the amount of camera shake ε is less than or equal to the threshold value η, there is no risk of camera shake, so step #
The process proceeds to step 108 or step # 208, and the photographing is performed as usual.

On the other hand, if the camera shake amount ε exceeds the threshold value η, there is a risk of camera shake.
9 or proceeds to step # 209. Step # 109
Alternatively, in step # 209, the CPU 10 outputs an instruction signal for issuing a warning of camera shake to a display unit (not shown) of the camera 24. Alternatively, the CPU 10 outputs a release lock signal for prohibiting photographing to the input means 16 to prevent photographing in the state of camera shake. Next, after a series of processing is completed, the process proceeds to step # 110, the program is reset, and the processing is completed.

As described above, according to this embodiment, the amount of camera shake occurring in the camera 24 is calculated by using the attitude detection sensor 12 composed of the weight body 20 and the pressure sensitive sheet 22 shown in FIG. Therefore, the structure is simplified, and the camera shake can be detected without using the conventionally required acceleration sensor, vibration sensor, or the like. Therefore, the camera 24 can be downsized and the price can be reduced. In addition, the posture detection sensor 12
Since it can be used as a vertical position sensor at the same time,
The mercury sensor used to switch the photometric output of the evaluation photometry from the horizontal position to the vertical position is not required, the structure is simplified, and the problem of environmental damage after disposal does not occur.

The present invention has been described above with reference to the preferred embodiments, but the present invention is not limited to these embodiments, and various improvements and changes can be made without departing from the gist of the present invention. Is. For example, in this embodiment, as the attitude detection sensor 12, as shown in FIG.
Weight body 20 contacting 2 at two contact points 14 and 15
However, the number of contact points with the pressure sensitive sheet 22 may be any number.

[0035]

As described above in detail, since the attitude detection sensor having a simple structure composed of the pressure sensitive sheet and the weight body can be used to detect the attitude difference of the camera,
It is possible to reduce the size and cost of the camera. In addition, since the attitude detection sensor can be used as a vertical position sensor that switches the photometric output of the evaluation photometry from the horizontal position to the vertical position at the same time, the structure of the camera having both the evaluation photometry and the camera shake prevention function can be simplified. .

[Brief description of drawings]

FIG. 1 is a block diagram showing a circuit configuration of a camera capable of detecting a posture difference according to an embodiment of the present invention.

FIG. 2 is a diagram showing a posture detection sensor which is a main part of a camera capable of detecting a posture difference according to the present embodiment.

FIG. 3 is an explanatory diagram in a case where a posture of the camera is detected by the posture detection sensor of FIG.

FIG. 4 is an explanatory diagram when the orientation of the camera is detected by the orientation detection sensor of FIG.

FIG. 5 is a graph showing a change in posture of a camera per unit time.

FIG. 6 is an explanatory diagram showing a relationship between a focal length f (mm) and a camera shake amount ε.

FIG. 7 is an explanatory diagram showing a flow in the case of prohibiting photographing or issuing a warning of camera shake.

FIG. 8 is a flowchart showing an operation when panning is performed using the camera capable of detecting a posture difference according to the present embodiment.

[Explanation of symbols]

 10 CPU (arithmetic means) 12 12A 12B Attitude detection sensor 14 15 Contact point 16 Input means 18 Correction optical system (camera shake correction means) 18A Lateral actuator 18B Vertical actuator 20 Weight 22 Pressure sensitive sheet 24 Camera

Claims (5)

[Claims] 1. A camera including a weight and a pressure sensitive sheet, wherein the weight contacts the pressure sensitive sheet at at least two contact points, and the pressure sensitive sheet detects a reaction force at each contact point of the weight. The attitude difference of the camera body is calculated by calculating the attitude of the camera body every unit time based on the attitude detection sensor built in the body and the reaction force data of each contact point detected by the attitude detection sensor. A camera capable of detecting a posture difference, including a posture difference calculating means. 2. The camera according to claim 1, wherein the camera body is shaken when the attitude difference of the camera body calculated by the attitude difference calculating means exceeds a predetermined value. A camera capable of detecting a posture difference, which is provided with a warning means for warning that. 3. The camera capable of detecting a posture difference according to claim 1, further comprising a photographing prohibiting means for prohibiting photographing when the posture difference of the camera body calculated by the posture difference calculating means exceeds a predetermined value. A camera capable of detecting a posture difference, which is provided. 4. The camera capable of detecting a posture difference according to claim 1, further comprising camera shake correction means for correcting camera shake based on a camera body posture difference calculated by the posture detection sensor. A camera that can detect attitude differences. 5. The camera capable of detecting a posture difference according to any one of claims 1 to 4, when the posture of the camera is detected as a vertical position by the posture detection sensor, photometry for evaluation photometry A camera capable of detecting an attitude difference, comprising: switching means for switching an output from a horizontal position to a vertical position, and threshold setting means for setting the predetermined value to a value for the vertical position.