JP2004191543A - Shutter device for camera - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To surely form a small aperture state in the case of high luminance, especially, in a shutter device for a camera having a shutter blade for opening and a shutter blade for closing. <P>SOLUTION: The shutter device for a camera is equipped with the opening shutter blade 30 performing the opening operation of an aperture part for exposure 10a and the closing shutter blade 40 performing the closing operation thereof in the case of exposure operation, a 1st electromagnetic driving source 50 for driving to open/close the blade 30, a 2nd electromagnetic driving source 60 for driving to open/close the blade 40, and a control means 81 for driving and controlling the electromagnetic driving source. Which is driven earlier, the blade 30 or the blade 40, is selectively decided in accordance with the light quantity of a subject. In the case of high luminance, the blade 30 performs the opening operation after the shutter 40 starts the closing operation earlier. Thus, a high-quality photographic image is obtained while performing high speed photography. <P>COPYRIGHT: (C)2004,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a camera shutter device mounted on a silver halide film type camera or the like and capable of high-speed photographing, and in particular, includes an open shutter blade and a closed shutter blade which are separately driven to open and close an opening for exposure. The present invention relates to a camera shutter device.
[0002]
[Prior art]
As a conventional camera shutter device, a substrate having an opening for exposure, an open shutter blade for starting exposure and a closing shutter blade for ending exposure that are rotatably supported on the substrate and capable of opening and closing the opening, 2. Description of the Related Art There is known an electromagnetic shutter provided with two electromagnetic driving sources for separately driving an open shutter blade and a closing shutter blade, a drive control circuit for driving and controlling the electromagnetic driving source, and the like (for example, see Patent Document 1).
[0003]
[Patent Document 1]
Published Japanese Utility Model Application No. Hei 6-28843
[Problems to be solved by the invention]
By the way, in the above-mentioned conventional apparatus, at the time of the exposure operation, the driving control is performed so that the opening shutter blade starts the opening operation first, and then the closing shutter blade performs the closing operation. Therefore, in order to form the small aperture state when the subject has high brightness, the closing shutter blade must be driven so as to start the closing operation without delaying the opening operation of the opening shutter blade.
For this purpose, it is necessary to make the closing operation of the closing shutter blade very fast or to start the closing operation immediately. However, there is a limit in increasing the speed due to the effect of the inertia of the shutter blades and the driving performance of the electromagnetic drive source.
[0005]
The present invention has been made in view of the above circumstances, and an object thereof is to perform an exposure operation by separately driving an open shutter blade performing an opening operation and a closing shutter blade performing a closing operation. For high-speed shooting, optimal exposure characteristics can be obtained according to the amount of light (brightness) of the subject, and an optimal aperture state can be formed at high brightness to obtain a high-quality captured image. An object of the present invention is to provide a shutter device.
[0006]
[Means for Solving the Problems]
A shutter device for a camera according to the present invention includes an opening shutter blade that performs an opening operation from a closed position that closes an exposure opening to an opening position that opens the exposure opening during an exposure operation, and an exposure opening that performs an exposure operation. A closing shutter blade that performs a closing operation from an opening position to open toward a closing position to be closed, a first electromagnetic drive source that opens and closes the opening shutter blade, and a second electromagnetic drive source that opens and closes the closing shutter blade; A control device for driving and controlling both electromagnetic drive sources, wherein the control device drives one of an open shutter blade and a close shutter blade first during an exposure operation. Is selectively determined according to the amount of light of the subject, and energization control is performed on the electromagnetic drive source.
[0007]
According to this configuration, the control unit drives the open shutter blade first and then drives the closed shutter blade according to the light amount (luminance) level of the subject (field) measured prior to photographing. Alternatively, since the control of driving the closing shutter blade first and then driving the opening shutter blade is selectively performed so as to obtain the optimum exposure characteristic, a high-quality image can be obtained while performing high-speed shooting. Obtainable.
[0008]
In the above configuration, when the light amount of the subject is equal to or more than a predetermined level, the control unit performs energization control on the electromagnetic drive source so that the closing shutter blade starts the closing operation and then the opening shutter blade performs the opening operation. , Configuration can be adopted.
According to this configuration, when the light amount of the subject is equal to or more than the predetermined level (high brightness), the closing shutter blade starts the closing operation first, and then the opening shutter blade starts the opening operation. Is obtained. Thus, a high-quality image can be captured even at the time of high luminance.
[0009]
In the above configuration, the control means sets a pause time during which the first electromagnetic drive source is de-energized in order to hold the open shutter blade in the closed position for a predetermined time from the start of the control sequence for controlling the exposure operation. The configuration can be adopted.
According to this configuration, in the control sequence for controlling the exposure operation, an area in which the open shutter blade is not driven is set from a start time (a predetermined reference time before the start of the exposure) to a pause time of a predetermined length. Therefore, when the closing shutter blade is driven first, this region can be used as the approaching section of the closing shutter blade, so that the shutter speed can be further increased.
[0010]
In the above configuration, the control unit sets the exposure adjustment time from the start of the control sequence to the start of energization by closing the second electromagnetic drive source in order to adjust the predetermined exposure time. it can.
According to this configuration, in order to obtain an exposure adjustment time (ie, an optimum exposure time (exposure amount)) from the start of the control sequence, the second electromagnetic drive source is closed and energized so that the closing shutter blade performs the closing operation. ) Is set, so that the closing operation of the closing shutter blade can be controlled with high accuracy at a desired timing.
[0011]
In the above configuration, the control unit compares the exposure adjustment time with the pause time, and when it is determined that the exposure adjustment time is shorter than the pause time, the control unit causes the closing shutter blade to start the closing operation and then opens the shutter blade. In order to perform the above, a configuration in which energization control is performed on the electromagnetic drive source can be adopted.
According to this configuration, it is determined whether or not to drive the closing shutter blade first only by determining whether or not the exposure adjustment time is shorter than the pause time, so that the control sequence is simplified.
[0012]
In the above configuration, it is possible to adopt a configuration in which the start of the control sequence is set to a point in time when the energization of the opening for returning the closed shutter blade to the open position is completed.
According to this configuration, in the control sequence for driving and controlling the open shutter blade and the closed shutter blade for the exposure operation, the time when the closed shutter blade returns to the open position is defined as the start time, so that the reference point of the sequence is stable. In addition, the relative drive timing of the open shutter blade and the close shutter blade can be controlled more reliably and more accurately.
[0013]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.
1 to 9 show an embodiment of a camera shutter device according to the present invention. FIG. 1 is a plan view of the device, FIG. 2 is an exploded sectional view, and FIGS. FIG. 6 is a plan view showing the state of the shutter blades, FIG. 6 is a block diagram showing a control circuit of the entire apparatus, and FIGS. 7 to 9 are a flowchart and a time chart showing a control sequence.
[0014]
As shown in FIGS. 1 to 3, this apparatus is supported movably with respect to a base plate 10 and a back plate 20 as substrates having exposure openings 10a and 20a, and the base plate 10, and can open and close the opening 10a. The opening shutter blade 30 and the closing shutter blade 40, a first electromagnetic drive source 50 for driving the opening and closing of the opening shutter blade 30, a second electromagnetic driving source 60 for driving the opening and closing of the closing shutter blade 40, the opening shutter blade 30 and the closing shutter 40 , And a control circuit 80 for performing various calculations and determinations to drive and control the electromagnetic drive sources 50 and 60.
[0015]
As shown in FIGS. 1 to 3, the base plate 10 has a circular exposure opening 10 a, spindles 11 and 12 for supporting the open shutter blade 30, and spindles 13 and 14 for supporting the closed shutter blade 40. 15, 16, through holes 10 b and 10 c that allow movement of drive pins 51 a and 61 a, which will be described later, and stoppers (not shown) that stop the open shutter blade 30 and the closed shutter blade 40 at the closed position and the open position, respectively, are formed. ing. As shown in FIG. 2, the back plate 20 is connected to the main plate 10 at a predetermined interval, and defines a blade chamber W in which the open shutter blade 30 and the closed shutter blade 40 are swingably accommodated.
[0016]
As shown in FIGS. 3, 4, and 5, the open shutter blade 30 includes a blade 31 and a blade 32 that are swingably supported by the support shafts 11 and 12, respectively. The open shutter blades 30 (31, 32) have circular holes 31a, 32a and long holes 31b, 32b, respectively. The support shafts 11, 12 are inserted into the circular holes 31a, 32a, and drive pins are inserted into the long holes 31b, 32b. 51a is inserted.
That is, the opening shutter blades 30 (31, 32) overlap with each other as shown in FIG. 4 to close the opening 10a, and separate from each other as shown in FIGS. It is swingable between an open position and an open position, and is driven and controlled to perform an open operation from the closed position to the open position during the exposure operation.
[0017]
As shown in FIGS. 3, 4 and 5, the closing shutter blade 40 is swingably supported by one of the blades 41 and 43 supported by the support shafts 13 and 15 and the support shafts 14 and 16. It is constituted by the other supported blades 42 and 44. The closing shutter blade 40 (41, 42, 43, 44) has circular holes 41a, 42a, 43a, 44a and long holes 41b, 42b, 43b, 44b, respectively, and is supported by the circular holes 41a, 42a, 43a, 44a. The shafts 13, 14, 15, 16 are inserted, and the drive pins 61a are inserted into the long holes 41b, 42b, 43b, 44b.
That is, the closing shutter blades 40 (the blades 41 and 43 and the blades 42 and 44) overlap with each other as shown in FIG. 5 to close the opening 10a, and as shown in FIGS. It is swingable between an open position in which the opening 10a is separated and opened, and during the exposure operation, drive control is performed so as to perform a closing operation from the open position to the closed position.
[0018]
As shown in FIGS. 1 and 2, the first electromagnetic drive source 50 includes a rotor 51 having a columnar magnet portion magnetized to the N pole and the S pole and a drive pin 51 a protruding from the magnet portion. Moving magnet type formed by a frame member 52 that rotatably supports the frame 52, an exciting coil 53 wound around the frame member 52, a cylindrical yoke 54 fitted outside the frame member 52, and the like. It is a motor. The drive pin 51a is connected to the circular holes 31a and 32a of the open shutter blade 30 (31 and 32) as shown in FIG.
That is, when the rotor 51 rotates within a predetermined angle range, the open shutter blade 30 opens and closes the opening 10a. Here, during the exposure operation, the rotor 51 rotates clockwise in FIG. 3 to move the open shutter blade 30 from the closed position to the open position.
[0019]
As shown in FIGS. 1 and 2, the second electromagnetic drive source 60 includes a rotor 61 having a columnar magnet portion magnetized to the N and S poles and a drive pin 61 a protruding from the magnet portion. A moving magnet type motor formed by a frame member 62 rotatably supported, an exciting coil 63 wound around the frame member 62, a cylindrical yoke 64 fitted outside the frame member 62, and the like. It is. Then, as shown in FIG. 3, the drive pin 61a is connected to the circular holes 41a, 42a, 43a, 44a of the closing shutter blade 40 (41 to 44).
That is, when the rotor 61 rotates within a predetermined angle range, the closing shutter blade 40 opens and closes the opening 10a. Here, during the exposure operation, the rotor 61 rotates counterclockwise in FIG. 3 to move the closing shutter blade 40 from the open position to the closed position.
[0020]
As shown in FIG. 6, the control circuit 80 controls the first electromagnetic drive source 50 by controlling the first electromagnetic drive source 50 and a control unit 81 including a CPU or the like as control means for performing various arithmetic and determination processes and issuing control signals. One motor drive circuit 82, a second motor drive circuit 83 for controlling the drive of the second electromagnetic drive source 60, a sensor signal detection circuit 84 for detecting an output signal from the optical sensor 70, and the entire silver halide film camera A distance measuring device 85a for measuring a distance to a subject, a distance measuring circuit 85 for processing an output signal from the distance measuring device 85a, a photometric device 86a and a photometric device 86a for measuring a light amount (brightness) of a subject (field). A photometric circuit 86 for processing an output signal from the camera, a motor driving circuit 87 for driving and controlling a motor 87a for winding the film F, and a lapse of time from the start of a control sequence for controlling a series of exposure operations. The timer 88 to measure between, the storage unit 89 for storing various information, a main switch 90 performs the power on / off of the camera body, and is made of such a release switch 91 which emits an ON / OFF signal by the release operation.
[0021]
When controlling the exposure operation, the control unit 81 determines which one of the open shutter blade 30 and the closed shutter blade 40 is driven first based on the light amount level of the subject obtained from the photometer 86a and the photometer circuit 86. It is selectively determined (determined), and based on the determination, the energization control is performed on the electromagnetic drive sources 50 and 60, respectively.
That is, when the light amount of the subject is equal to or higher than the predetermined level (high brightness), the control unit 81 closes the second electromagnetic drive source 60 to start the closing operation of the closing shutter blade 40, and then starts the opening shutter blade. The first electromagnetic drive source 50 is energized so as to cause the opening shutter 30 to perform the opening operation. On the other hand, when the amount of light of the subject is less than a predetermined level (low brightness), the first electromagnetic drive source 50 causes the opening shutter blade 30 to start the opening operation. After the first electromagnetic drive source 40 is opened and energized, the second electromagnetic drive source 60 is energized so that the closing shutter blade 40 performs the closing operation.
[0022]
Further, the control unit 81 measures the pause time H of a predetermined length set in advance by the timer 88 from the start time S of the control sequence for controlling the exposure operation, and keeps the open shutter blade 30 until the pause time elapses. Is controlled so that the first electromagnetic drive source 50 is de-energized so as to maintain the power supply in the closed position.
As described above, by providing the pause H, it is possible to set a region in which the open shutter blade 30 is not driven, that is, a delay time for delaying the operation. Therefore, when the closed shutter blade 40 is driven first, this region is closed. , And the shutter speed can be further increased.
[0023]
Further, the control unit 81 determines the optimal exposure time (shutter) prior to the exposure operation based on the light amount information of the subject (information on whether the brightness is high or low) obtained by the photometer 86a and the photometry circuit 86. Is calculated in advance, and the exposure adjustment time from the start S of the control sequence to the start of energization to close the second electromagnetic drive source 60 (to start the closing operation of the closing shutter 40) is set.
Here, the exposure adjustment time is defined as a total time obtained by adding the fixed exposure time (TAE) to the individual difference exposure time (AED).
[0024]
Then, the control unit 81 determines the end timing of the exposure adjustment time while comparing it with the pause time H, and determines that the exposure adjustment time is shorter than the pause time H, that is, the exposure time before the pause time H elapses. When it is determined that the adjustment time has ended, first, the second electromagnetic drive source 60 is closed and energized so that the closing shutter blade 40 starts the closing operation and then the opening shutter blade 30 performs the opening operation. Thereafter, the first electromagnetic drive source 50 is opened and energized.
On the other hand, when the controller 81 determines that the exposure adjustment time is longer than the pause time H, that is, when it determines that the pause time H has elapsed before the exposure adjustment time ends, the controller 81 performs the opening operation on the opening shutter blade 30. Is performed, first, the first electromagnetic drive source 50 is opened and energized, and then the second electromagnetic drive source 60 is closed and energized so as to cause the closing shutter blade 40 to perform the closing operation.
[0025]
Here, the start time S of the control sequence is set to a point in time when the opening energization to the second electromagnetic drive source 60 is completed in order to return the closed shutter blade 40 to the open position. Thereby, the relative drive timing of the open shutter blade 30 and the close shutter blade 40 can be controlled more reliably and with high accuracy. Further, since the exposure operation is controlled only by comparing and determining whether the exposure adjustment time is shorter or longer than the pause time H, the control sequence is further simplified.
[0026]
Next, the operation when the camera shutter device is mounted on a silver halide film type camera will be described with reference to FIGS. The position information of the open shutter blade 30 and the closed shutter blade 40 detected by the optical sensor 70 and the sensor signal detection circuit 84 is taken into the control unit 81 and used as information for controlling the following operation.
First, in a shooting standby state in which the main switch 90 is turned on, when a release operation is performed and the release switch 91 emits a trigger signal, the light amount level of the subject is measured based on output signals from the photometer 86a and the photometer circuit 86, The optimum exposure time is calculated, and the exposure adjustment time (AED + TAE) is set.
When the second electromagnetic drive source 60 is opened and energized and the energization is completed, the control sequence starts at a time S, and a timer 88 for measuring the pause H is started (step S1). The area (AED) starts (step S2).
[0027]
Subsequently, it is determined whether or not the area before the exposure adjustment time (AED) has ended (step S3). If it is determined that the previous area (AED) has ended, the area (TAE) after the exposure adjustment time starts (step S4), and then the area (TAE) after the exposure adjustment time ends. It is determined whether or not it has been performed (step S5). Here, when it is determined that the rear area (TAE) has ended, first, as shown in FIG. 8, the second electromagnetic drive source 60 is closed and energized for a predetermined time (for example, 30 ms). The closing shutter blade 40 starts the closing operation (step S6).
[0028]
Then, it is determined whether or not the pause time H has ended (step S7). When it is determined that the pause time has ended, the first electromagnetic drive source 50 is opened and energization is performed for a predetermined time (for example, 30 ms). And the opening shutter blade 30 performs an opening operation (step S8). Thus, the exposure operation is completed, and the photographing at the time of high luminance is completed.
In this way, when the exposure adjustment time ends before the elapse of the pause time, that is, when the light amount is equal to or more than the predetermined level (high brightness), the closing shutter blade 40 starts the closing operation and then opens the shutter blade 30. By performing the opening operation, a desired small aperture state is formed, so that optimal exposure is performed according to the light amount level (high luminance) of the subject, and a high-quality image is captured at high speed.
[0029]
If it is determined in step S5 that the area (TAE) after the exposure adjustment time has not ended, then it is determined whether or not the pause time H has elapsed (finished) (step S9). Here, if it is determined that the pause time (H) has not elapsed, the process returns to step S5.
On the other hand, if it is determined that the pause time (H) has elapsed, as shown in FIG. 9, first, the first electromagnetic drive source 50 is energized for a predetermined time (for example, 30 ms), and the open shutter is opened. The blade 30 performs an opening operation (step S10).
[0030]
Subsequently, it is determined whether or not the post-exposure time (TAE) has ended (step S11). If it is determined that the post-exposure time (TAE) has ended, as shown in FIG. The closing drive is performed on the electromagnetic drive source 60 for a predetermined time (for example, 30 ms), and the closing shutter blade 40 performs the closing operation (step S12). Thus, the exposure operation is completed, and the photographing at the time of low luminance is completed.
[0031]
As described above, when the pause time elapses before the exposure adjustment time (AED + TAE) ends, that is, when the light amount of the subject is less than the predetermined level (low brightness), the opening shutter blade 30 performs the opening operation and then closes. By causing the shutter blades 40 to perform the closing operation, the opening 10a is fully opened as shown in FIG. 3, and the optimal exposure is performed according to the light amount level (low brightness) of the subject, and a high-quality image is obtained. High-speed shooting.
[0032]
Further, if it is determined in step S3 that the area before the exposure adjustment time (AED) has not been completed yet, then it is determined whether or not the pause time (H) has elapsed (finished) (step S3). S13). Here, when it is determined that the pause time (H) has not elapsed, the process returns to step S3.
On the other hand, if it is determined that the pause time (H) has elapsed, as shown in FIG. 9, first, the first electromagnetic drive source 50 is energized for a predetermined time (for example, 30 ms), and the open shutter is opened. The blade 30 performs an opening operation (step S14).
[0033]
Subsequently, it is determined whether or not the area before the exposure adjustment time (AED) has ended (step S15). If it is determined that the area before the exposure adjustment time (AED) has ended, the area after the exposure adjustment time (TAE) is determined. The process starts (step S16), and subsequently, it is determined whether or not the rear area (TAE) has ended (step S17).
Here, when it is determined that the rear area (TAE) has ended, as shown in FIG. 9, the second electromagnetic drive source 60 is closed and energized for a predetermined time (for example, 30 ms). The shutter blade 40 performs a closing operation (step S18). Thus, the exposure operation is completed, and the photographing at the time of low luminance is completed.
[0034]
As described above, when the pause time elapses before the end of the area before the exposure adjustment time (AED), that is, when the light amount of the subject is less than the predetermined level (low brightness), the opening shutter blade 30 performs the opening operation. After that, the closing operation is performed by the shutter blades 40, so that the opening 10a is fully opened as shown in FIG. 3, and the optimal exposure is performed in accordance with the light amount level (low brightness) of the subject, and high image quality is achieved. Images are taken at high speed.
[0035]
In the above embodiment, the case where the open shutter blade 30 is formed by the two blades 31 and 32 and the closed shutter blade 40 is formed by the four blades 41, 42, 43 and 44 has been described. However, other numbers of open shutter blades and closed shutter blades may be employed.
[0036]
In the above embodiment, the case where the camera shutter device is mounted on a silver halide film type camera has been described. However, if similar drive control is required, the present invention is applied to a digital camera that captures an image using an image sensor such as a CCD. May be.
[0037]
【The invention's effect】
As described above, according to the camera shutter device of the present invention, the opening shutter blade for starting the exposure, the closing shutter blade for ending the exposure, two electromagnetic driving sources for respectively opening and closing the shutter blades, and the like are provided. In the configuration, at the time of the exposure operation, which of the open shutter blade and the closed shutter blade is driven first is selectively determined according to the amount of light of the subject, so that when the subject has a low brightness, Since the open shutter blades can be driven first, or the closed shutter blades can be driven first when the subject has high brightness, optimal exposure characteristics can be obtained according to the light amount level, and high-speed shooting can be performed. It is also possible to obtain a high quality photographed image.
In particular, by setting a fixed area (rest time) in which the open shutter blade is not driven, this area can be used as a closing section of the shutter blade, so that when the closed shutter blade is driven first, the shutter speed is increased. Can be faster.
[Brief description of the drawings]
FIG. 1 is an external plan view showing an embodiment of a camera shutter device according to the present invention.
FIG. 2 is a developed sectional view showing a part of the device shown in FIG.
FIG. 3 is a plan view showing an open shutter blade and a closed shutter blade.
FIG. 4 is a plan view showing a state where an open shutter blade is at a closed position for closing an opening and a closed shutter blade is at an open position for opening an opening.
FIG. 5 is a plan view showing a state where an open shutter blade is at an open position where an opening is opened and a closed shutter blade is at a closed position where an opening is closed.
FIG. 6 is a block diagram illustrating a control circuit of the entire system when the camera shutter device is mounted on the camera.
FIG. 7 is a flowchart illustrating a control sequence of the camera shutter device.
FIG. 8 is a time chart showing a control sequence of the camera shutter device at the time of high luminance.
FIG. 9 is a time chart showing a control sequence of the camera shutter device at the time of low luminance.
[Explanation of symbols]
10 Ground plate 10a, 20a Exposure openings 10b, 10c Through holes 11, 12, 13, 14, 15, 16 Support shaft 20 Back plate 30 (31, 32) Open shutter blade 40 (41, 42, 43, 44) Close Shutter blade 50 First electromagnetic drive source 51 Rotor 51a Drive pin 53 Coil 60 Second electromagnetic drive source 61 Rotor 61a Drive pin 63 Coil 70 Optical sensor 80 Control circuit 81 Control unit (control means)
82 First motor drive circuit 83 Second motor drive circuit 84 Sensor signal detection circuit 85 Distance measurement circuit 86 Photometry circuit 86a Photometer 88 Timer 89 Storage unit 90 Main switch 91 Release switch H Pause time S At start of control sequence

Claims (6)

An opening shutter blade that performs an opening operation from the closed position to close the exposure opening during the exposure operation to an open position that opens from the closed position, and a shutter blade that opens the exposure opening during the exposure operation from the open position to the closed position that closes. And a first electromagnetic drive source for opening and closing the open shutter blade, a second electromagnetic drive source for opening and closing the close shutter blade, and a drive control of the electromagnetic drive source. Control means, and a camera shutter device comprising:
The control means selectively determines which of the open shutter blade and the closed shutter blade should be driven first during the exposure operation according to the amount of light of the subject, and controls the power supply to the electromagnetic drive source. I do,
A shutter device for a camera. When the light amount of the subject is equal to or more than a predetermined level, the control means controls the electromagnetic drive source to supply current so that the closing shutter blade starts the closing operation and then the opening shutter blade performs the opening operation. ,
2. The camera shutter device according to claim 1, wherein: The control means sets a pause time during which the first electromagnetic drive source is de-energized so as to hold the open shutter blade at the closed position for a predetermined time from the start of a control sequence for controlling an exposure operation. Do
3. The camera shutter device according to claim 2, wherein: The control means sets an exposure adjustment time from the start of the control sequence to the start of energization by closing the second electromagnetic drive source, in order to adjust a predetermined exposure time,
The shutter device for a camera according to claim 2 or 3, wherein: The control means compares the exposure adjustment time with the pause time, and, when it is determined that the exposure adjustment time is shorter than the pause time, causes the closing shutter blade to start a closing operation and then opens the shutter blade. Performing energization control on the electromagnetic drive source so as to perform an opening operation on the
5. The camera shutter device according to claim 4, wherein: 5. The camera shutter device according to claim 3, wherein at the start of the control sequence, the time is set to a point in time when opening current supply for returning the closed shutter blade to the open position is completed. 6. .

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