JPH06160952A - State output device - Google Patents

Abstract

PURPOSE:To surely discriminate the stabilization of a circuit by counting the time after switching on, comparing the time with the specified time corresponding to the time constant of a circuit and stably displaying the time. CONSTITUTION:This state output device has a clock circuit 13 as a clock means for counting the time after the filter circuit in a control circuit section 12 is turned on by a switch, a CPU 15 as a comparing means for comparing the time counted by the clock circuit 13 and the specified time corresponding to the time constant of the filter circuit and a display circuit 16 as an announcing means for announcing that the state of the circuit is stabilized in correspondence to the result of the comparison of the CPU 15. The time after the turning on of the switch is counted by the clock circuit 13. The CPU 15 compares this count value and the time corresponding to the time constant of the filter circuit, etc. Display is made in a display circuit 16 that the state of the circuit is stabilized when the lapse of the time for the sufficient stabilization of the state of the circuit is judged.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a status output device for detecting the status of a circuit having a time constant such as a filter circuit and an integration circuit, and more particularly to a status output device used in an image blur prevention camera having a built-in image stabilization circuit. .

[0002]

2. Description of the Related Art As an example of a conventional circuit having a time constant, a circuit having a time constant used in an image blur prevention camera having a camera shake correction circuit will be described.

A camera having a conventional camera shake correction circuit is
As disclosed in JP-A-2-126251, a camera shake angular velocity signal is obtained from an angular velocity detection sensor, and a camera shake displacement amount is obtained through a filter circuit, a drift compensation circuit and an integration circuit. In the method described in this publication, there is no specific countermeasure for the waiting time until the stable state after energization, which is usually a problem in the filter circuit, and it is another important factor. Regarding only the integration constant of the integrator circuit, "When the shutter speed is fast (that is, when it is bright), the integration constant is made small so that it can respond to the release immediately, and when the shutter speed is slow, that is, when it is dark. In addition to warning the photographer to wait for release, the integration constant is increased and loose camera shake can also be detected. "

[0004]

As described above, in order to obtain the amount of camera shake displacement, the signal from the angular velocity detection sensor is filtered and further integrated. The filter circuit and integration circuit used therefor are used. There are many problems to be considered in the circuit having the time constant as described below, and it cannot be said that the above-mentioned conventional techniques have sufficiently disclosed measures against these problems.

(1) When obtaining the amount of camera shake displacement, not only an integrating circuit that integrates the signal from the angular velocity detection sensor, but also a filter circuit that removes the drift component and noise component included in the signal from the angular velocity detection sensor is used. Required,
In this filter circuit, since the frequency band of the camera shake signal obtained from the angular velocity detection sensor is about 1 to 10 Hz, its cutoff frequency is a very low frequency of 1 Hz or less. In such a filter circuit, it takes a considerable time (tens of seconds) from the start of energization until the circuit becomes stable.

(2) The same applies to the integrating circuit,
When the subject is dark, it takes a considerably long time to determine the integration constant.

(3) As described above, it takes a lot of time for the camera shake correction circuit to be in a state in which it can stably start operating, and specific measures against these problems are required, and the circuit is stable. Until it is changed, it is necessary to give a warning to the photographer by some means, but the conventional example does not disclose this warning means in detail.

(4) Further, there is a point to be further considered regarding the warning means. For example, if a temporary warning means such as a warning sound is used as the warning means, if the photographer misses this, the filter circuit is stabilized, the setting of the integration constant of the integration circuit is completed, and the photographing is performed. A situation arises in which it is not possible to determine whether or not an operation should be performed. Therefore, it is necessary to take measures to avoid such a situation.

The present invention has been made in view of the above problems, and provides a state output device for effectively discriminating and displaying a stable state of a circuit having a time constant, and more particularly, a hand used for an image blur preventing camera. An object of the present invention is to provide a state output device that can effectively determine the stable state of a circuit having a time constant in the blur correction circuit and allow the photographer to clearly recognize the state.

[0010]

According to a first aspect of the present invention, there is provided a state output device, wherein the filter circuits 31 and 41 in the control circuit section 12 as a circuit having a time constant and the circuits are turned on / off.
A switch (S
W5,6) 34,44 and switch (SW5,6) 3
A clock circuit 13 as a clock means for counting the time from when the filter circuits 31, 41 are turned on by 4, 44.
And the CPU 15 as a comparison means for comparing the time counted by the time counting circuit 13 with the constant time corresponding to the time constants of the filter circuits 31 and 41, and the state of the circuit corresponding to the comparison result of the CPU 15. It is characterized in that it is provided with a display circuit 16 as a notifying means for notifying the stabilization.

The state output device according to a second aspect of the present invention is characterized in that the display circuit 16 as a notification means continuously notifies that the states of the filter circuit 31 and the like in the control circuit section 12 have been stabilized. It is the state output device according to 1.

A state output device according to a third aspect of the present invention is a filter circuit 31, 41 as a filter having a predetermined characteristic for filtering an input signal with a circuit having a time constant.
The state output device according to claim 1 or 2, which is an integrating circuit 51 that integrates the input signal.

The state output device according to a fourth aspect of the present invention is characterized in that the display circuit 16 as a notification means visually indicates that the states of the filter circuit 31 and the like in the control circuit section 12 have been stabilized. The state output device according to any one of claims 1 to 3.

According to a fifth aspect of the present invention, in the state output device, the notifying means notifies by sound that the states of the filter circuit 31 and the like in the control circuit section 12 have been stabilized.
The state output device according to any one of items 1 to 3.

A state output device according to a sixth aspect of the present invention is a camera 1
6. The CPU 15 (S106) as a control means for controlling the release of the camera 1 according to the comparison result by the CPU 15 (S105), further comprising a CPU 15 (S106). The state output device described in 1.

According to a seventh aspect of the present invention, there is provided a state output device including a camera 1
Has a built-in image stabilization circuit to correct camera shake,
The state output device according to claim 6, wherein the CPU 15 (S201 or S106) controls the release of the camera according to the comparison result of S105.

According to another aspect of the state output device of the present invention, there are a plurality of circuits having a time constant, and the CPU 15 has the largest time among the time counted by the time counting circuit 13 and the time constants of the plurality of circuits. The state output device according to claim 1, wherein a constant time corresponding to a constant is compared.

[0018]

In the state output device having the structure described in claim 1, the switches (SW5, 6) are turned on by the timing circuit 13.
When the CPU 15 compares the count value with the time constant of the filter circuit 31 or the like and counts the time after N, and determines that the time for the circuit state to sufficiently stabilize has elapsed, the CPU 15 displays The circuit 16 indicates that it has stabilized. Therefore, it can be reliably determined that the filter circuit 31 having the time constant has been stabilized.

In the state output device of the second aspect, the fact that the states of the filter circuit 31 and the like have been stabilized is continuously notified. Therefore, it can be confirmed at any time that the filter circuit 31 and the like have been stabilized.

In the state output device having the structure described in claim 3, the filter circuit 3 provided in the control circuit section 12 is provided.
The circuits having various time constants such as 1, 41 and the integrating circuit 51 are determined to have reached the stable state, so that the circuits having all the time constants in the control circuit unit 12 are surely secured. Can be stabilized.

In the state output device having the structure described in claim 4, the fact that the states of the filter circuit 31 and the like in the control circuit section 12 have been stabilized is visually displayed to notify the time constant in the control circuit section 12. It can be easily known that the circuit included therein is stabilized.

In the state output device having the structure according to the fifth aspect, the fact that the states of the filter circuit 31 and the like in the control circuit unit 12 are stabilized is notified by sound. Therefore, the control circuit unit 1
It can be easily known that the circuit having the time constant within 2 is stabilized.

In the state output device of the sixth aspect, the release operation of the camera can be performed after the filter circuit 31 and the like in the control circuit unit 12 are stabilized. Therefore, the photographing mistake of the photographer can be prevented.

In the state output device having the structure described in claim 7, when the release button is pressed before the state of the filter circuit 31 in the control circuit section 12 is stabilized,
Allows you to shoot without the image stabilization circuit functioning. Therefore, in the case of a photo opportunity, it is possible to take a picture without camera shake correction.

In the state output device having the structure described in claim 8, the time counted by the time counting circuit 13 corresponds to the largest time constant among the time constants of the filter circuit 31 and the like in the control circuit unit 12. The time is compared by the CPU 15. Therefore, the circuit having all the time constants in the control circuit unit 12 can be reliably operated normally.

[0026]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is a block diagram showing the configuration of an image blur prevention camera which is an embodiment of the state output device of the present invention.
This is an example in which the state output device of the present invention is applied to an image blur prevention camera, and is an embodiment commonly corresponding to the inventions of claims 1 to 8.

In FIG. 1, when the finder 10 is used, the light rays from the object (subject) to be photographed pass through the convex lens group 3, the concave lens group 4, the blur correction lens 5 in the lens barrel 2 of the camera body 1 and the reflection mirror 6. And reflected by the prism 9 and observed by the finder 10. Reflection mirror 6 when shooting
Rotates about the fulcrum 6a as the center of rotation to the position indicated by the broken line, and the light rays from the object to be photographed connect the screen 8 on the film.
Incidentally, 7 is a shutter. Half push switch (SW2)
24 and full-press switch (SW3) 25 are turned on when a release button (not shown) is half-pressed or fully-pressed.
It is a switch to do.

The shake correction lens 5 is driven by the actuator 23 and corrects the camera shake of the camera. The camera shake detector 11 using the angular velocity sensor is fixed to the lens barrel 2, and the angular velocity signal output from the camera shake detector 11 is transmitted to the control circuit unit 12. The control circuit unit 12 includes a low-pass filter circuit,
A high-pass filter circuit and an integrating circuit are included, and the time counting circuit 13 (time measuring means) measures the time until the filter circuit and the like in the control circuit unit 12 are energized and stabilized, and transmits the time to the CPU 15 (comparing means). The switch (SW4) 14 is a CPU
The signal from the control circuit section 12 is turned on upon receipt of the signal from the control circuit section 12, and the signal of camera shake from the control circuit section 12 is transmitted to the CPU 15. Also, CP
The display circuit 16 (notifying means) is connected to the U15, and the power source 18 is connected via the main switch (SW1) 17 (switching means).

The addition point 19 of the feedback is C
The command signal (Pr) for correcting the camera shake from the PU 15 and the feedback signal (Pf) from the position sensor 22 for detecting the position of the shake correction lens 5 are added together. The error signal is amplified by an amplifier (amplifier) 21 and becomes a drive signal for an actuator 23 that drives the shake correction lens 5.

The configuration and operation of the embodiment shown in FIG. 1 will be described in detail below. In addition, in order to simplify the explanation,
Only the case of camera shake in the vertical direction (the direction indicated by the symbol Y in FIG. 1) will be described. The operation in the X direction is the same as that in the Y direction, and the description thereof is omitted.

First, the configurations and operations of the control circuit section 12 and the clock circuit 13 will be described.

(1) An angular velocity signal from the camera shake detector 11 which is an angular velocity sensor is sent to the control circuit unit 12.
FIG. 2 is a block diagram showing an internal configuration of the control circuit unit 12. A signal from the camera shake detector 11 is sent to a high pass filter circuit (HPF) 31, where drift components of the detector are removed, and a low pass filter circuit ( LPF) 4
Sent to 1. The low pass filter (LPF) 41 removes high frequency noise components. The output signal of the low-pass filter circuit (LPF) 41 is sent to the integration circuit 51, where it is integrated and converted into a camera shake displacement amount.
It is sent to the CPU 15 via W4) 14.

(2) FIG. 3 shows a high-pass filter circuit (H
FIG. 4 is a diagram showing an example of a circuit configuration of the PF) 31, and FIG. 4 is a diagram showing frequency characteristics of the high pass filter circuit (HPF) 31. High-pass filter circuit (HPF) 31 of FIG.
, The DC component 32 (corresponding to the drift component) and the AC component 33 (corresponding to the camera shake signal) are switched by the switch (SW
5) It is sent to the capacitor (C) 35 via 34, the direct current component 32 is cut off, and only the alternating current component is resistor (R) 3
Appears at both ends of 6. Therefore, the drift component from the camera shake detector 11 is removed.

(3) FIG. 5 shows a low-pass filter circuit 41.
6 is a diagram showing an example of the circuit configuration of FIG. 6, and FIG. 6 is a diagram showing frequency characteristics of the low-pass filter circuit 41. In the low-pass filter circuit 41 of FIG. 5, the DC component 42 and the AC component 43 (corresponding to camera shake signal and high frequency noise) are sent to the resistor (R) 45 via the switch (SW6) 44, and the capacitor (C). Charge 46. Therefore, FIG.
As shown in the frequency characteristic of, the high frequency noise component is removed.

(4) The high pass filter circuit (HP
F) 31 and the low pass filter circuit (LPF) 41, the signal from the camera shake detector 11 (hand shake signal)
Since the frequency band of is a low frequency of about 1 to 10 Hz, their filter time constant τ (τ = C × R) is
Inevitably, it takes a few tens of seconds to obtain the frequency characteristics shown in FIGS. 4 and 6 in a stable manner.

Therefore, before the circuit is stabilized, the camera shake signal cannot be accurately detected, and camera shake occurs in the photographed picture. Therefore, it is necessary to detect that the filter circuit is stabilized and notify the photographer by some method.

(5) The clock circuit 13 is a circuit for measuring the time after the energization of the high-pass filter circuit (HPF) 31 shown in FIG. 3 and the low-pass filter circuit (LPF) 41 shown in FIG. is there.

(6) The timing circuit 13 is the switch (SW5) 3 of the high pass filter circuit (HPF) 31 shown in FIG.
4 or the low-pass filter circuit (LP
F) The switch (SW6) 44 of 41 is turned on and the time is measured, and the result is notified to the CPU 15. CPU
In FIG. 15, the filter circuit with the largest time constant in the control circuit unit 12, in other words, the time constant of the filter circuit that takes the longest time to stabilize is compared with the count value from the time counting circuit 13, and the predetermined time is compared. After that, if it is determined that the filter circuit is sufficiently stabilized (when the time corresponding to the time constant or more has elapsed), switch (SW4)
14 is turned on, and the camera shake signal is sent to the control circuit unit 12
To receive from.

(7) The main switch (SW1) 1
7 is provided at a position different from a release button (not shown), and when the main switch (SW1) 17 is turned on, power is supplied to the CPU 15 and C
The clock circuit 13 is activated via the PU 15. Also,
Switch (S) in high-pass filter circuit (HPF) 31
The W5) 34 (FIG. 3) and the switch (SW6) 44 (FIG. 5) in the low-pass filter circuit 41 are simultaneously turned on. Further, when the main switch (SW1) 17 is in the ON state, the switches (SW5, SW6) 34, 44 are O
Continue to maintain N state.

(8) The CPU 15 continuously performs stable display on the display circuit 16 at the time when the filter circuits 31 and 41 in the control circuit unit 12 become stable. For example,
As shown in FIG. 7 showing an example of the display method in the embodiment of the present invention, a circle "○" 6 is provided below the finder screen 61.
It lights up at 2. In addition, the photographer is prohibited from releasing until this display lights up. In some cases, the release may be performed without the camera shake correction. Further, the display circuit 16 does not necessarily have to be provided around the finder screen as in the present embodiment, and may be provided, for example, on the outer periphery of the camera body. Further, for example, until the predetermined time elapses, a notification sound may be continuously emitted at a constant interval to notify the photographer that the filter circuit is in the stabilization waiting state.

As described above, the photographer is notified of the stable state of the filter circuit in the control circuit unit 12. In the above description, the stabilization display of the filter circuits 31 and 41 is taken as an example, but in addition to the stabilization of the filter circuits 31 and 41, the integration time constant of the integration circuit 51 is also determined. In addition, the above-mentioned stabilization display may be performed.

Next, the operation of the camera shake correction circuit in the embodiment of FIG. 1 will be described.

(1) After the control circuit section 12 is in a stable state, a switch (SW4) is issued by a command from the CPU 15.
When 14 is turned on, the signal from the camera shake detector 11 is sent to the CPU 15 through the control circuit unit 12. CP
U15 calculates from the received camera shake signal how to move the shake correction lens 5. From the calculation result, the CPU 15 sends a command signal (Pr) to the addition point 19. A signal (Pf) from the position sensor 22 of the shake correction lens 5 is sent to the addition point 19 as a position feedback signal, and the signal (P
r) and the signal (Pf) are compared (computation of Pr-Pf).

(2) The comparison result is amplified by the amplifier 21 as an error signal and becomes a drive signal for the actuator 23. In this example, the actuator 23 drives the shake correction lens 5 in the Y direction, and moves according to a position command signal from the CPU 15.

As described above, when the filter circuits 31 and 41 are stabilized and the switch (W4) 14 is turned on, a feedback control system from the camera shake detector 11 to the shake correction lens 5 is constituted, and the camera Image blur can be prevented.

In the case of FIG. 1, the reflection mirror 6 is at the position shown by the solid line, the subject image is observed by the finder 10, and the image blur of the finder image is prevented. At the time of shooting, the reflection mirror 6 rotates about the fulcrum 6a to the position shown by the broken line and retracts outside the shooting optical path, so that image blurring of the screen 8 can be prevented.

FIG. 8 is a flow chart showing a first operation example of the embodiment of the present invention. That is, in this example,
While the filter circuit in the control circuit unit 12 is not stable,
This is an example of prohibiting release. Note that, here, “release” means that the camera starts a shooting operation.

The flowchart of FIG. 8 will be described below. Note that, here, the symbol “S” is used to represent the meaning of “step on the flowchart”.

(1) In S101, the main switch (SW1) is turned on, power is supplied, and the CPU1
5 starts operation.

(2) In S102, the switch (SW5) of the high-pass filter circuit 31 (FIG. 3) and the switch (SW6) of the low-pass filter circuit 41 (FIG. 5) are turned on almost at the same time when the main switch (SW1) is turned on. The filter circuit is energized. Further, the time counting of the time counting circuit 13 is also started.

(3) In S103, the shake correction lens 5 is moved to the position of the center of the optical axis as the position in the initial state.

(4) In S104, the time counting (time counting process) in the time counting circuit 13 after the energization of the filter circuit is started in S102 is continued.

(5) In S105, it is determined whether the time counted in S104 is sufficiently longer than the time constant of the filter circuit and the filter circuit is in a stable state.
U15 judges. If it is not stable (if NO)
Shifts to S106, the release is prohibited even if the release button is pressed here, and the time measurement process is continued in S104. If it is determined to be stable (YES), S1
Proceed to 07.

(6) Since the filter circuit is stabilized in S107, the CPU 15 sends a signal to the display circuit 16 to display that the filter circuit is stabilized (FIG. 7).
The circular mark 62 is displayed in a lit state).

(7) When the release button (not shown) is in the half-pressed state in S108, the half-press switch (S
Since W3) is turned on, at this time, the shooting preparation stage is entered (the release preparation stage is entered).

(8) At the beginning of the preparatory stage, in step S109, distance measurement processing is executed to measure the distance to the subject.

(9) Next, in S110, photometric processing is performed to determine the aperture and shutter speed.

(10) In S111, the switch (S
Since W4) is turned on, the shake correction lens 5 is moved to perform image blur prevention processing. As a result, the image in the viewfinder 10 becomes stable (no blurring).

(11) In S112, a full-press switch (SW3) is pressed by full-pressing a release button (not shown).
Waits for ON.

(12) In S113, when the full-press switch (SW3) is turned on, the mirror 6 retracts from the position of the solid line inside the photographing optical path to the position of the broken line outside the optical path (FIG. 1). During this time, the blur correction lens 5 temporarily returns to the center position of the optical axis. This is to maximize the shake correction range in any direction.

(13) In step S114, the shake correction lens 5 starts the image stabilization processing.

(14) In S115, the shutter 7 is opened and the exposure on the screen 8 is started.

(15) In S116, the shake correction lens 5 performs image stabilization processing on the image on the screen 8 in response to the signal from the camera shake detector 11, stabilizes the captured image, and prevents camera shake.

(16) In S117, the shutter 7 is closed and the exposure on the screen 8 is completed.

(17) The image stabilization processing ends in S118.

(18) In S119, the blur correction lens 5 returns to the lens center position of the optical axis. This is to prepare for the next shooting.

(19) In S120, the film on the screen 8 is rolled up.

(20) In S121, mechanical charging is performed.

This is the end of one shot of the camera in this embodiment. Note that if the main switch (SW1) remains ON, the stable display of the filter circuit remains lit, and the next shooting may be started from S108. In this case, the stabilization waiting time of the filter circuit can be omitted, which is efficient.

In the flow chart described above, the case where the state of the filter circuit is determined to be stable and the release is permitted has been exemplified. However, the present invention is not limited to this, and stable display is performed at the time when the time constant of the integrating circuit is determined. May be released to allow the release.

9 and 10 are flowcharts showing a second operation example of the embodiment of the present invention. That is,
This example shows a process in the case where the release button is pressed before the filter circuit in the control circuit unit 12 becomes stable, and the image is released and exposed without performing the image stabilization process. This is because a so-called photo opportunity is not missed.

The flowcharts of FIGS. 9 and 10 will be described below. The processes corresponding to those in the first operation example of FIG. 8 are designated by the same reference numerals, and the description thereof will be omitted as appropriate.

(1) In S105 of FIG. 9, the branch on the YES side is the same as in the first operation example, and the description of that part will be omitted. The branch on the NO side (when the filter circuit is not stable) moves to S201 in FIG.

(2) In S201 of FIG. 10, when the release button is pressed halfway (when the halfway press switch SW2 is turned on) despite the fact that the filter circuit is not stable, the preparatory stage for photographing is entered. In this case, the display circuit 16
Doesn't show steady state. If SW2 is not turned on, the process returns to S104 of FIG. 9 to continue counting the time.

(3) In S202 of FIG. 10, distance measurement processing is executed.

(4) In S203, photometric processing is performed to determine the aperture and shutter speed.

(5) In S204, the release switch (not shown) is fully pressed to wait for the full-press switch (SW3) to be turned on. When the switch (SW3) is turned on, the mirror 6 retracts from the position indicated by the solid line inside the photographing optical path to the position indicated by the broken line outside the optical path (FIG. 1).

(6) In S205, the shutter 7 is opened and the exposure on the screen 8 is started. In this case, the state of the filter circuit is not stabilized, so at this time, the screen 8
The anti-vibration process is not performed. At this time, the blur correction lens 5 is fixed around the optical axis, and normal photographing is performed.

(7) In S206, the shutter 7 is closed and the exposure on the screen 8 is completed.

(8) After that, the state of the camera is S in FIG.
Return to 120, perform the processing of S120 and S121, and
Finish the second shooting.

As described above, the following effects can be obtained by using the state output device of the present invention in an image blur prevention camera.

(1) Filter circuit 3 in the control circuit section 12
By continuously displaying the stable display after the states of 1, 41 and the like have been stabilized, the photographer can determine the state of the camera at a glance, and can easily determine whether or not the camera is in a photographable state.

(2) Since the stable display of the state of the circuit having the time constant is continuously displayed, the photographer can always know the state of the camera.

(3) Since the main switch (SW1) is provided, if the switch (SW1) is kept ON,
Without waiting for the filter circuit 31 etc. to stabilize,
You can move on to the next shooting operation.

[0085]

According to the state output device of the first aspect,
The time counting means counts the time after the switch is turned on, the comparison means compares it with a fixed time corresponding to the time constant of the circuit (for example, an integral multiple of the time constant), and the notification means performs a stable display. Therefore, it is possible to reliably determine that the circuit state has been stabilized.

According to the state output device of the second aspect, the fact that the state of the circuit has been stabilized is continuously notified, so that it is possible to always know that the state of the circuit has been stabilized.

According to the state output device of the third aspect, it is possible to determine that all of the filter circuit and, in some cases, the integrating circuit have reached a stable state, so that a circuit having all time constants can be reliably performed. Can be stabilized.

According to the state output device of the fourth aspect, the fact that the state of the circuit has been stabilized is visually displayed and notified, so that it is possible to easily know that the circuit has been stabilized.

According to the state output device of the fifth aspect, the fact that the state of the circuit has been stabilized is notified by sound, so that it is possible to easily know that the state of the circuit has been stabilized.

According to the state output device of the sixth aspect, since the release operation of the camera can be performed after the circuit is stabilized, the photographer's operation error can be prevented.

According to the seventh aspect of the state output device, even when the state of the circuit is not stabilized, the normal photographing can be performed, so that the so-called shutter opportunity is not missed.

According to the state output device of the present invention, the count value of the time measuring means is compared with the constant time corresponding to the largest time constant in the circuit, so that when the circuit has a plurality of times. Even if it has a constant, the circuit can be reliably operated normally.

[Brief description of drawings]

FIG. 1 is a block diagram showing a configuration of a camera having an image blur prevention device which is an embodiment of a state output device of the present invention.

FIG. 2 is a block diagram showing an internal configuration of a control circuit unit 12 of FIG.

3 is a diagram showing an example of a circuit configuration of a high-pass filter circuit 31 of FIG.

FIG. 4 is a diagram showing frequency characteristics of the high-pass filter circuit 31 of FIG.

5 is a diagram showing an example of a circuit configuration of a low-pass filter circuit 41 of FIG.

6 is a diagram showing frequency characteristics of the low-pass filter circuit 41 of FIG.

FIG. 7 is a diagram showing an example of a display method according to an embodiment of the present invention.

FIG. 8 is a flowchart showing a first operation example of the exemplary embodiment of the present invention.

FIG. 9 is a flowchart (first half) showing a second operation example of the exemplary embodiment of the present invention.

FIG. 10 is a flowchart (second half) showing a second operation example of the exemplary embodiment of the present invention.

[Explanation of symbols]

 1 Camera Main Body 2 Lens Barrel 3 Convex Lens Group 4 Concave Lens Group 5 Shake Correction Lens 6 Reflecting Mirror 7 Shutter 8 Screen on Film 9 Prism 10 Finder 11 Camera Shake Detector 12 Control Circuit Section 13 Clock Circuit (Timekeeping Means) 14 Switch (SW4) 15 CPU 16 Display Circuit (Notification Means) 17 Switch (SW1) (Switch Means) 18 Power Supply 19 Addition Point 21 Amplifier 22 Position Sensor 23 Actuator 31 High Pass Filter Circuit 41 Low Pass Filter Circuit 51 Integrating Circuit 32, 42 DC Component 33, 43 AC component 34 Switch (SW5) (switching means) 35,46 Capacitor (C) 36,45 Resistor (R) 44 Switch (SW6) (switching means) 51 Integrating circuit 61 Finder screen

Claims (8)

[Claims] 1. A circuit having a time constant, a switch means for turning on / off the circuit, a time counting means for counting a time after the circuit is turned on by the switch means, and a time counting means for counting the time. And a comparing means for comparing a certain time corresponding to the time constant of the circuit, and a notification means for notifying that the state of the circuit has been stabilized, corresponding to the comparison result of the comparing means. Characteristic status output device. 2. The state output device according to claim 1, wherein the notification means continuously notifies that the state of the circuit has been stabilized. 3. The state output device according to claim 1, wherein the circuit is a filter circuit which filters an input signal and has a predetermined characteristic, or an integrating circuit which integrates the input signal. . 4. The state output device according to claim 1, wherein the notifying unit displays and notifies that the state of the circuit has been stabilized. 5. The state output device according to claim 1, wherein the notifying means notifies by sound that the state of the circuit has been stabilized. 6. The state output device is built in a camera, and further comprises control means for controlling a release of the camera in accordance with a comparison result of the comparison means. 5. The state output device according to any one of 5 above. 7. The camera has a built-in camera shake correction circuit for correcting camera shake, and the control means corresponds to a comparison result of the comparison means,
7. The status output device according to claim 6, wherein the release of the camera is controlled. 8. The circuit includes a plurality of circuits, and the comparing means sets the time counted by the time measuring means and a predetermined time corresponding to the largest time constant among the time constants of the plurality of circuits. The state output device according to claim 1, wherein the state output device is compared.