JP2002258349A - Shutter device for camera, and camera - Google Patents

Abstract

PROBLEM TO BE SOLVED: To always perform operation normally even when shutter speed is set to be high. SOLUTION: This shutter device for a camera is equipped with shutter blades 28 and 30 performing the opening/closing operation of an exposure aperture part 26, a driving part 32 equipped with a solenoid for operating to open/close the blades 28 and 30, a detection part 34 detecting the opening operation time of the aperture part 26 and a control part 36 controlling so that driving voltage may be supplied to the driving part 30 for a specified time, and performing specified correcting operation to the driving part 30 so as to satisfy a specified condition related to exposure when the opening operation of the aperture part 26 detected by the detection part 34 does not satisfy the specified condition.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a shutter device for a camera having a drive unit for opening and closing shutter blades for opening and closing an exposure opening, and a camera provided with the shutter device.

[0002]

2. Description of the Related Art Conventionally, as a shutter device of a camera,
As disclosed in JP-A-5-45698 and the like, a pair of shutter blades are opened and closed by rotating a stepping motor with respect to an exposure opening, and JP-A-7-159852. As described in Japanese Patent Application Laid-Open No. H11-157, various types have been proposed, such as one in which a pair of shutter blades are opened and closed with respect to an exposure opening by displacement of a plunger of a solenoid. Among these shutter devices, those using a stepping motor or an iris motor can easily set the high-speed time, but since it is unavoidable to increase the price, a low-priced camera uses a solenoid. Inexpensive shutter devices are often employed.

[0003]

However, in a shutter device using a solenoid, when a shutter speed is set to a high speed, a shutter voltage is generated between a timing of supplying a drive voltage to the solenoid and a timing of starting an opening operation of a shutter blade. There is a disadvantage that the shutter speed becomes unstable due to the time lag. Such inconvenience occurs more remarkably as the shutter speed becomes higher, and in the worst case, an unexposed state may occur in which the exposure opening is not opened despite the supply of the drive voltage to the solenoid.

That is, as shown in FIG. 6, when the shutter speed is set to a medium-to-low speed (for example, 1/60 second or less) and a drive voltage is supplied to the solenoid at time t1, a predetermined time later. At time t2, the opening operation of the shutter blades is started (at this time, a detection signal from a detection unit that detects the opening operation of the shutter blades is turned on), and at time t.
At 3, the vehicle is fully opened. Then, for example, 25 from time t1
When the supply of the drive voltage to the solenoid is stopped at time t4 after ms, the closing operation is started at time t5 after a predetermined time, and the fully closed state is obtained at time t6 (at this time, the detection from the detection unit is performed). The signal turns off.)

On the other hand, as shown in FIG. 7, when the shutter speed is set to a high speed (for example, 1/250 second or more), a drive voltage is supplied to the solenoid at time t1, and at time t2, for example, 4 ms later. The supply of the drive voltage to the solenoid is stopped. Then, at time t3 after the supply of the driving voltage is stopped, the opening operation of the shutter blade is started (at this point, a detection signal from a detection unit that detects the opening operation of the shutter blade is turned on), and the predetermined time is set. At time t4 after the time, the fully closed state is established (at this point, the detection signal from the detection unit is turned off).

As described above, when the shutter speed is set to the middle / low speed seconds, the period during which the drive voltage is supplied even if there is a time lag between the supply timing of the drive voltage and the start timing of the opening operation of the shutter blades. Since the shutter blades are fully opened, no particular problem occurs. However, when the shutter speed is set to high-speed seconds, the supply of the driving voltage is stopped before the opening operation of the shutter blades is started, and the operation becomes extremely unstable.

Therefore, in the case of using a solenoid, it is necessary to keep the highest shutter speed lower than necessary in order to ensure the operation reliability, and the performance is inferior to those using a stepping motor. There was a problem that would be. Although such a problem is remarkable in a shutter device using a solenoid, even when the shutter device has another configuration, the supply timing of the driving voltage to the driving portion of the shutter blade and the opening operation of the shutter blade are performed. A configuration in which a time lag occurs between the start timing and the start timing can similarly occur.

The present invention has been made in view of such circumstances, and has as its object to provide a camera shutter device and a camera which always operate normally even when the shutter speed is set to a high speed second. I do.

[0009]

According to a first aspect of the present invention, there is provided a shutter device for a camera, comprising: a shutter blade for opening and closing an exposure opening; a driving unit for opening and closing the shutter blade; Detecting means for detecting the opening operation time of the exposure opening; driving voltage supplied to the driving means for a predetermined time; and the opening operation of the exposure opening detected by the detecting means is related to the exposure. And control means for performing a predetermined correction operation on the drive means so as to satisfy the condition when the predetermined condition is not satisfied.

According to this configuration, when the opening operation of the exposure opening does not satisfy the predetermined condition related to the exposure, the predetermined correction operation is performed on the driving means so as to satisfy the predetermined condition. For example, when the exposure unit is in an unexposed state in which the opening operation of the exposure opening is not performed at all, the driving unit is driven again, or when the opening operation time of the exposure opening is not within the allowable range, the driving voltage to the driving unit is A correction operation such as changing the supply time of the data is performed. Therefore, a shutter device that always operates normally even when the shutter speed is set to high-speed seconds is realized.

According to a second aspect of the present invention, in the camera shutter device according to the first aspect, the control unit is configured to detect the exposure opening by the detection unit even though a driving voltage is supplied to the driving unit. When the opening operation is not detected, a correction operation is performed so that the driving voltage is resupplied to the driving means for a time longer than the predetermined time so that the opening operation is performed. Features.

According to this configuration, when the opening operation of the exposure opening is not detected, the drive voltage is supplied again in a drive time longer than the first drive time. For this reason, even when the shutter speed is set at the high speed second, the unexposed state is reliably avoided, and a shutter device that always operates normally even when the shutter speed is set at the high speed second is realized. Note that the time required until the drive voltage is resupplied is extremely short, for example, 10 to 30 ms, so that the photographer does not feel uncomfortable.

According to a third aspect of the present invention, in the camera shutter device according to the first aspect, the control means controls the opening operation of the exposure opening detected by the detection means within a predetermined allowable time. When the driving voltage is not present, a correction operation for changing the driving voltage supply time is performed so that the opening operation of the exposure opening at the next photographing is within the allowable time.

According to this configuration, when the opening operation of the exposure opening does not exist within the preset allowable time, the driving voltage is adjusted so that the opening operation of the exposure opening in the next photographing operation exists within the allowable time. Supply time is changed. For this reason, at the next photographing, the drive voltage is supplied based on the changed supply time, so that the photographing is performed in a more appropriate exposure state, and the photographing is always performed normally even when the shutter speed is set to high speed second. The shutter device that operates in the above manner is realized.

According to a fourth aspect of the present invention, in the camera shutter device according to the third aspect, the supply time of the drive voltage is stored in an electrically rewritable storage means, and the correction operation is performed. The supply time stored in the storage means is rewritten.

According to this structure, when the opening operation of the exposure opening does not exist within the preset allowable time, the storage means is arranged so that the opening operation of the exposure opening at the next photographing exists within the allowable time. Is rewritten for the drive voltage supply time stored in the. Therefore, at the next photographing, the drive voltage is supplied based on the rewritten supply time, and photographing is performed in a more appropriate exposure state.

According to a fifth aspect of the present invention, in the camera shutter device according to any one of the first to fourth aspects, the driving means includes an electromagnetic drive source and a drive shaft that moves forward and backward with respect to the electromagnetic drive source. Wherein the shutter blades are opened and closed according to the displacement of the drive shaft body with respect to the electromagnetic drive source.

According to this configuration, the operation of opening and closing the shutter blades is performed by displacing the drive shaft of the solenoid with respect to the electromagnetic drive source. Therefore, an inexpensive shutter device is realized because the configuration of the driving unit is simplified.

A camera according to a sixth aspect of the present invention is characterized in that the camera shutter device according to any one of the first to fifth aspects is arranged inside a camera housing on which a photographic lens is mounted. .

According to this configuration, when the opening operation of the exposure opening does not satisfy the predetermined condition related to the exposure, the predetermined correction operation is performed on the driving means so as to satisfy the predetermined condition. For example, when the exposure unit is in an unexposed state in which the opening operation of the exposure opening is not performed at all, the driving unit is driven again, or when the opening operation time of the exposure opening is not within the allowable range, the driving voltage to the driving unit is A correction operation such as changing the supply time of the data is performed. Therefore, a camera that always operates normally even when the shutter speed is set to high-speed seconds is realized.

[0021]

FIG. 1 is an external perspective view of a camera to which a shutter device according to an embodiment of the present invention is applied, and FIG. 2 is a block diagram showing a schematic configuration of the shutter device. In these figures, a camera 10 includes a camera body 12, a photographing lens 16 mounted on a lens barrel 14 provided on the front of the camera body 12, and a camera body 12.
A release button 18 provided on the upper surface of the end of the camera, and a finder 2 provided above the lens barrel 14 of the camera body 12.
0. The camera body 12 and the lens barrel 14
A shutter device 24 (FIG. 2) is provided inside the camera housing 22 composed of.

The shutter device 24 includes an exposure opening 26 formed of a circular hole formed at a position corresponding to the photographing lens 16 on a shutter base plate (not shown).
6, a pair of shutter blades 28 and 30 for opening and closing
And these shutter blades 28 and 30 are
And a detecting unit 3 for detecting the opening operation time of the exposure opening 26 when the shutter blades 28 and 30 are operated in the opening direction by the driving unit 32.
4 and a drive voltage is supplied to the drive section 32 for a predetermined time, and the drive section 32 is driven in accordance with the actual opening operation time of the exposure opening 26 detected by the detection section 34.
And a control unit 36 for performing a predetermined correction operation on the control signal.

The shutter blades 28 and 30 have, at their lower ends, a spindle 3 attached to a shutter base plate.
8, 40 are supported so as to be rotatable in a direction of coming and going with each other. Further, the shutter blades 28 and 30 are disposed such that their lower ends overlap each other, and long holes 42 and 44 into which a common drive pin 66 described later are fitted are formed in the overlapping region.

A long hole 42 formed in one shutter blade 28 is formed to have a right-upward slope when the exposure opening 26 shown in FIG. 2 is closed, and the other shutter blade 30 The elongated hole 44 formed in FIG.
Is formed so as to have a downward slant when the exposure opening 26 is closed. As a result, the shutter blades 28 and 30 move the drive pin 66 when the drive unit 32 is driven to open the exposure opening 26, and the drive pin 6 when the drive unit 32 stops driving.
The movement of the shutter 6 causes the exposure opening 26 to be closed.

The drive section 32 includes an electromagnetic drive source 46 and an electromagnetic drive source 4 each having an exciting coil disposed in a stator yoke.
6. A solenoid 50 including a drive shaft (plunger) 48 which moves forward and backward with respect to the electromagnetic drive source 46 in accordance with the presence or absence of the excitation of 6.
And a sector lever 54 rotatably supported at the center by a support shaft 52 attached to the shutter base plate, and rotated in accordance with the displacement of the drive shaft body 48 with respect to the electromagnetic drive source 46.

The drive shaft 48 is mounted so that one end thereof can move forward and backward inside the electromagnetic drive source 46.
A first flange portion 56 is formed at an intermediate portion of a portion exposed to the outside of the electromagnetic drive source 46, and the electromagnetic drive source 46
A second flange portion 58 and a third flange portion 60 are formed at a predetermined distance from each other at a distal end exposed outside. The electromagnetic drive source 46 and the first flange 5
A coil spring 62 for urging the drive shaft 48 in the direction of pulling the drive shaft 48 to the outside is disposed between the coil spring 62 and the coil spring 62. Thereby, when the electromagnetic drive source 46 is excited, the drive shaft 48 enters the inside of the electromagnetic drive source 46 against the urging force of the coil spring 62, and when the excitation of the electromagnetic drive source 46 is released. The portion of the drive shaft 48 that has entered the inside of the electromagnetic drive source 46 is retracted to the outside of the electromagnetic drive source 46 by the urging force of the coil spring 62.

The sector lever 54 has, at one end, an engagement pin 64 to be engaged between the second flange portion 58 and the third flange portion 60, and at the other end, a long hole of the shutter blades 28, 30. Driving pins 66 fitted to 42 and 44 are attached. Thus, when the electromagnetic drive source 46 is in the non-excited state, the drive shaft 48 is retracted to the outside of the electromagnetic drive source 46 by the urging force of the coil spring 62, so that the sector lever 54 rotates clockwise (clockwise). Direction). Therefore, FIG.
As shown in (2), since the driving pin 66 is moved upward, the shutter blade 28 rotates counterclockwise (counterclockwise) and the shutter blade 30 rotates clockwise (clockwise). The movement of the exposure opening 26
Is closed by the pair of shutter blades 28, 30.

When the electromagnetic drive source 46 is in the excited state, the drive shaft 48 enters the inside of the electromagnetic drive source 46 against the biasing force of the coil spring 62, as shown in FIG. Then, the sector lever 54 is turned counterclockwise (counterclockwise). For this reason, the driving pin 66 is moved downward, so that the shutter blade 2
8 rotates clockwise (clockwise) and the shutter blade 30 rotates counterclockwise (counterclockwise), so that the exposure opening 26 is opened.

The detection unit 34 includes a light transmission type photo interrupter 68 having a light emitting element and a light receiving element, and a timer 7.
0. The photo-interrupter 68 has a configuration in which the exposure opening 26 has a pair of shutter blades 2.
When the shutter blades 28 and 30 are closed, the upper end of one shutter blade 28 blocks the light emitting element and the light receiving element, and the shutter blades 28 and 30 are rotated to open the exposure opening 26. When the shutter blades are started, the upper end of one of the shutter blades 28 is disposed at a position where it is retracted from between the light emitting element and the light receiving element. In this embodiment, the photointerrupter 68 integrally includes a drive circuit for driving the light emitting element and the light receiving element.

The timer 70 is provided with the shutter blade 2
After the upper and lower ends of the shutter blades 28 are retracted from the position where the upper end of the shutter blade 28 blocks between the light emitting element and the light receiving element, the shutter blades 28 and 30 are rotated in the closing direction to rotate the shutter blade 28. Is measured until it returns to a position where the upper end of the light-emitting element and the light-receiving element block the light-emitting element again. As a result, the actual opening operation time of the exposure opening 26 due to the opening and closing operation of the shutter blades 28 and 30 is detected.

The control unit 36 has a CP for executing arithmetic processing.
U, a ROM for storing processing programs and data, and a RAM for temporarily storing data. The control unit 36 includes the timer 70 for measuring the actual opening operation time of the exposure opening 26, a photometry unit 72 for measuring the luminance of the field, an ISO output unit 74 for outputting the film sensitivity, and an electromagnetic A drive circuit 76 for supplying a drive voltage to the drive source 46; a drive time (shutter drive time) of the drive unit 32 with respect to the control EV value;
An electrically rewritable storage unit 78 such as an EEPROM that stores the allowable range of the proper opening operation time (the allowable range of the proper shutter opening time) of No. 6 is connected.

Further, the control unit 36 has the luminance information of the subject inputted from the photometry unit 72, the film sensitivity information inputted from the ISO output unit 74, and the FNo. Of the photographing lens set by the photographer or the like. A calculating unit 361 that calculates the control EV value based on the information, performs a predetermined determination by comparing the actual opening operation time of the exposure opening 26 measured by the timer 70 with the allowable range stored in the storage unit 78. Determination unit 36
2. The storage unit is configured to enter the allowable range when the actual opening operation time of the exposure opening 26 measured by the timer 70 is less than the lower limit value of the allowable range stored in the storage unit 78 and when it exceeds the upper limit value. A correction unit 363 that corrects (changes) the drive time of the drive unit 32 (that is, the supply time of the drive voltage to the drive unit 32) stored in the storage unit 78, and that the calculated control EV value is equal to or greater than the maximum set value. In addition, despite the supply of the driving voltage to the driving unit 32, the exposure opening 26
When the actual opening operation time is zero (that is, in the unexposed state), the driving time of the driving unit 32 is set to be longer than the initial value, and the re-driving unit 364 for re-driving the driving unit 32 Each function realizing unit is provided.

FIG. 4 is a diagram for explaining a data structure related to the control EV value stored in the storage unit 78. That is, the storage unit 78 stores the control EV value calculated by the calculation unit 361, the drive time of the drive unit 32 corresponding to each control EV value, and the appropriate opening time of the exposure opening unit 26 corresponding to each control EV value. The allowable range is stored in a table format. Here, the driving time of the driving unit 32 corresponds to the shutter speed, and a predetermined driving voltage is supplied from the driving circuit 76 to the electromagnetic driving source 46 by outputting a driving signal from the control unit 36. Delivery time (ie,
(An energizing time to the exciting coil of the electromagnetic drive source 46). The proper opening operation time of the exposure opening 26 is an opening operation time of the exposure opening 26 for obtaining a proper exposure state, and a driving voltage is supplied to the electromagnetic driving source 46 for a predetermined driving time. Sometimes, it refers to the time from when the exposure opening 26 is actually opened to when it is closed.

Next, the operation of the shutter device 24 configured as described above will be described with reference to the flowchart shown in FIG. First, after the main power supply (not shown) of the camera 10 is turned on and the release button 18 is turned on, the brightness information of the subject input from the photometry unit 72 is displayed.
The film sensitivity information input from the ISO output unit 74 and the FNo. The control EV value is calculated by the calculation unit 361 based on the information (Step S1).

Next, based on the calculated control EV value,
The drive time of the corresponding drive unit 32 stored in the storage unit 78 is read, and a drive signal is output from the control unit 36 for the read drive time, so that the drive circuit 76 is operated, and the electromagnetic drive is performed. A drive voltage is supplied to the excitation coil of the source 46, and the drive unit 32 is driven (step S3). That is, a drive voltage is supplied to the excitation coil of the electromagnetic drive source 46 for a drive time corresponding to the control EV value, whereby the drive shaft 48 enters the inside of the electromagnetic drive source 46 to open the shutter blades 28 and 30. The operation is performed.

At this time, the detachment of the upper end of one shutter blade 28 from the photointerrupter 68 and the return to the photointerrupter 68 are detected by the photointerrupter 68 of the detection unit 34, and the time between them is detected by the timer 74. While the actual opening operation time of the exposure opening 26 is measured by counting, the allowable range of the opening operation time corresponding to the calculated control EV value is read from the storage unit 78, and the measured opening operation time is measured. The determination unit 362 determines whether or not the time is within the read allowable range (step S5).

If the determination in step S5 is negative, the opening operation time of the exposure opening 26 is zero (ie,
It is determined by the determination unit 362 whether or not it is in an unexposed state (step S7). When the determination in step S5 is affirmative, it means that shooting was performed with normal exposure,
The operation of the shutter device 24 ends. The non-exposure state occurs when the calculated control EV value is equal to or more than the maximum value (16 or more in this embodiment), and the driving time of the drive unit 32 is the shortest (4 in this embodiment). .0 ms).

If the determination in step S7 is affirmative, based on the instruction from the re-driving section 364, the driving time (4.0 ms in this embodiment) that is initially read is slightly longer than the driving time (4.0 ms in this embodiment). For example, the control unit 36 is only 4.2 ms).
The drive circuit 76 is operated by the output of the drive signal from, and the drive voltage is supplied to the excitation coil of the electromagnetic drive source 46, whereby the drive unit 32 is driven again (step S9).

The re-drive time is a time experimentally confirmed in advance so as not to be in the unexposed state, and is stored in, for example, the storage unit 78. Further, the time lag between the initial driving and the re-driving can be set within a range of, for example, about 10 to 30 ms at which the photographer cannot recognize that the re-driving is performed. For this reason, even when the shutter speed is set to high-speed seconds, an unexposed state can be reliably avoided, so that it is not necessary to keep the highest shutter speed low at the time of design.

On the other hand, if the determination in step S7 is negative, it is determined whether or not the measured actual opening operation time of the exposure opening 26 is less than the lower limit of the proper opening operation time stored in the storage unit 76. The determination is made by the determination unit 362 (step S11). If this determination is affirmative (in this case, underexposure occurs), the drive time of the drive unit 32 stored in the storage unit 76 (ie, the drive voltage supply time to the drive unit 32) is set to the initial set value. The data is rewritten by the correction unit 363 so that the value becomes slightly longer (for example, 4.2 ms) than (for example, 4.0 ms when the control EV value is 16 or more) (step S13). For this reason, at the next shooting, shooting can be performed with more appropriate exposure.

If the determination in step S11 is negative (in this case, the image is overexposed), the storage unit 76.
The driving time of the driving unit 32 stored in the storage unit is initially set (for example, 4.0 ms when the control EV value is 16 or more).
The data is rewritten by the correction unit 363 so as to have a value slightly shorter (for example, 3.8 ms) (step S15). For this reason, at the next shooting, shooting can be performed with more appropriate exposure.

According to the present invention, as in the above embodiment, the shutter blades 28 and 30 for opening and closing the exposure opening 26 are provided.
A drive unit 32 for opening and closing the shutter blades 28 and 30; a detection unit 34 for detecting an opening operation time of the exposure opening 26; and a drive voltage supplied to the drive unit 32 for a predetermined time. In addition, a control unit 36 is provided for performing a predetermined correction operation on the drive unit 32 when the opening operation time of the exposure opening 26 detected by the detection unit 34 does not satisfy the predetermined condition.

That is, when an unexposed state occurs in which the opening operation of the exposure opening is not performed at all, the driving unit 32 is driven again with a driving time longer than the initial driving time. When the shutter speed is not within the allowable range, by performing the correction operation for changing the drive time of the drive unit 32, it is possible to always operate normally even when the shutter speed is set to high-speed seconds.

It should be noted that the present invention is not limited to the above-described embodiment, but may adopt various modifications as described below.

(1) In the above embodiment, when the control EV value is equal to or more than the maximum set value and the state is unexposed, the drive is simply re-driven for a drive time longer than the first drive time, but is not limited to this. is not. For example, by changing the driving time of the driving unit 32 stored in the storage unit 78 to a driving time longer than the initial set value, it is possible to prevent an unexposed state at the next photographing. Can also.

(2) In the above embodiment, the exposure opening 26
When the actual opening operation time is not within the allowable range of the appropriate opening operation time, the drive time of the drive unit 32 is rewritten.
It may be performed only when the value is a value, or may be performed for each control EV value.

(3) In the above embodiment, the exposure opening 26
The drive time of the drive unit 32 is rewritten when the actual open operation time of the drive unit 32 does not fall within the allowable range of the appropriate open operation time. However, the present invention is not limited to this. For example, a plurality of drive times are stored in the storage unit 78 in advance corresponding to the maximum control EV value or each control EV value, and the plurality of drive times are read out in a preset order, so that the first If a predetermined exposure cannot be obtained at the time of photographing, the next drive time may be read to perform a shutter operation.

(4) In the above-described embodiment, the detection section 34 has the light transmission type photo interrupter 68 as a sensor for detecting the shutter blades 28 and 30, but the invention is not limited to this. For example, a reflection type photo interrupter can be used. Further, instead of the optical sensor such as the photo interrupter 68, a magnetic sensor or other various sensors can be used.

(5) In the above embodiment, the exposure opening 26
Although the shutter blades 28 and 30 that perform the opening and closing operations are composed of a pair, the invention is not limited to this. For example,
It is also possible to use three or more shutter blades.

(6) In the above embodiment, the solenoid 50
Although the drive shaft 48 is configured to be sucked into the electromagnetic drive source 46 when a drive voltage is supplied to the electromagnetic drive source 46, the present invention is not limited to this. For example, a configuration in which the drive shaft body 48 is pushed out when a drive voltage is supplied to the electromagnetic drive source 46 may be used. In this case, for example, the shutter blade 28,
The shape of 30 may be such that the exposure opening 26 is closed when the drive shaft 48 in which the solenoid 50 is not driven is present inside the electromagnetic drive source 46.

(7) In the above embodiment, the driving unit 32
It has a solenoid 50 and a sector lever 54,
It is not limited to this. For example, the drive unit 32 can be configured with only the solenoid 50. That is,
The pair of shutter blades 28 and 30 are configured to be provided with a biasing force in a direction in which the exposure opening 26 is fully opened by a biasing means such as a tension coil spring or the like. A movable drive pin is inserted into each of the movable shafts 42 and 44. When the electromagnetic drive source 46 of the solenoid 50 is not driven, the drive shaft 48
The drive pin is urged at the end of the shutter blade so that the shutter blades are closed against the urging force of the urging means.

Thus, when the electromagnetic drive source 46 is not driven, the exposure opening 26 is in a closed state, but when a drive voltage is supplied to the electromagnetic drive source 46, the drive shaft 48 is Since the electromagnetic drive source 46 is attracted, the urging force on the drive pins inserted into the elongated holes 42 and 44 is released, and the exposure opening 26 is opened. In the case where the drive shaft 48 is pushed out when the solenoid 50 is supplied with a drive voltage to the electromagnetic drive source 46, the pair of shutter blades 28 and 30 is biased by a tension coil spring or the like. What is necessary is just to make it the structure to which the urging | biasing force of the direction which makes the exposure opening part 26 closed by means was provided.

(8) In the above-described embodiment, the shutter blades 28 and 30 are opened and closed so that the exposure opening 26 is in one of a closed state and a fully opened state. Not something. For example, solenoid 5
The drive voltage supplied to the electromagnetic drive source 46 of 0 can be selectively supplied as either a high value or a low value, so that the displacement amount of the drive shaft body 48 can be varied, and the low value is selected. It is also possible to set the exposure opening 26 to an intermediate opening state in which the exposure opening 26 is not fully opened.

(9) In the above embodiment, the drive unit 32 of the shutter blades 28, 30 has been described as having a configuration using the solenoid 50, but is not limited to this. For example, if a time lag occurs between the operation start timing of the drive unit and the opening operation start timing of the shutter blade even in another drive unit that does not use a solenoid, the same correction operation as in the above embodiment is performed. It can be carried out.

[0055]

As described above, according to the camera shutter device of the first aspect, when the opening operation of the exposure opening detected by the detection means does not satisfy the predetermined condition related to exposure. Since the control unit includes a control unit that performs a predetermined correction operation so that the drive unit satisfies a predetermined condition, a shutter device that always operates normally even when the shutter speed is set to high-speed seconds is realized. be able to.

According to the camera shutter device of the second aspect, when the control means detects that the opening operation of the exposure opening is not detected by the detection means even though the drive voltage is supplied to the drive means, Since the correcting operation is performed so that the driving voltage is resupplied for a time longer than the predetermined time so that the opening operation is performed, the unexposed state is set even if the shutter speed is set to the high speed second. Is reliably avoided, and a shutter device that always operates normally can be realized.

According to the camera shutter device of the third aspect, when the opening operation of the exposure opening detected by the detecting unit does not exist within the preset allowable time range, the control unit performs the next photographing. The correction operation of changing the supply time of the drive voltage is performed so that the opening operation of the exposure opening at the time is within the allowable time range, so that the supply of the drive voltage is performed based on the changed supply time at the next shooting. As a result, it is possible to realize a shutter device in which shooting is performed with proper exposure and the shutter device always operates normally even when the shutter speed is set to high-speed seconds.

According to the camera shutter device of the fourth aspect, the supply time of the drive voltage is stored in the electrically rewritable storage means, and the correction operation is performed in the storage means stored in the storage means. Since the time is rewritten, the drive voltage is supplied based on the renewed supply time at the next shooting, so that the shooting is performed with the proper exposure and the shutter speed is always normal even if the shutter speed is set to high speed seconds A shutter device that operates in a short time can be realized.

According to the camera shutter device of the fifth aspect, the driving means includes a solenoid having an electromagnetic drive source and a drive shaft moving forward and backward with respect to the electromagnetic drive source. Since the shutter blades are opened and closed according to the displacement of the shutter, the configuration of the driving means can be simplified, and an inexpensive shutter device can be realized.

According to the camera of the sixth aspect, the camera shutter device according to any one of the first to fifth aspects is provided inside the camera housing in which the photographing lens is mounted. Even if the speed is set to high-speed seconds, a camera that always operates normally can be realized.

[Brief description of the drawings]

FIG. 1 is an external perspective view of a camera to which a shutter device according to an embodiment of the present invention is applied.

FIG. 2 is a block diagram showing a state in which an exposure opening of a shutter device applied to the camera shown in FIG. 1 is closed.

FIG. 3 is a block diagram illustrating a state in which an exposure opening of a shutter device applied to the camera illustrated in FIG. 1 is fully opened;

FIG. 4 is a diagram for explaining a data structure stored in a storage unit of the shutter device shown in FIG.

FIG. 5 is a flowchart for explaining the operation of the shutter device shown in FIG. 2;

FIG. 6 is a time chart for explaining the relationship between the supply of a drive voltage to the drive unit of the shutter blade and the opening / closing operation of the shutter blade when the shutter speed is set to the middle and low speed seconds.

FIG. 7 is a time chart for explaining the relationship between the supply of a driving voltage to the drive unit of the shutter blade and the opening and closing operation of the shutter blade when the shutter speed is set to high-speed seconds.

[Explanation of symbols]

 Reference Signs List 10 camera 16 shooting lens 22 camera housing 24 shutter device 26 exposure opening 28, 30 shutter blade 32 drive unit (drive unit) 34 detection unit (detection unit) 36 control unit (control unit) 46 electromagnetic drive source 48 drive shaft 50 solenoid 78 storage unit (storage means)

Claims (6)

[Claims] 1. A shutter blade for opening and closing an exposure opening, a driving unit for opening and closing the shutter blade, a detecting unit for detecting an opening operation time of the exposure opening, and a predetermined time for the driving unit. Only when the driving voltage is supplied, the driving unit satisfies the condition when the opening operation of the exposure opening detected by the detecting unit does not satisfy a predetermined condition related to exposure. Control means for performing a predetermined correction operation as described above. 2. The control device according to claim 1, wherein the detecting unit detects no opening operation of the exposure opening even though the driving voltage is supplied to the driving unit. 2. A correction operation for performing the opening operation by re-supplying the driving voltage for a long time.
The shutter device of the camera according to the above. 3. When the opening operation of the exposure opening detected by the detection unit does not exist within a predetermined allowable time, the control unit determines that the opening operation of the exposure opening in the next photographing is the allowable operation. 2. The camera shutter device according to claim 1, wherein a correction operation for changing the supply time of the drive voltage so as to be within the time is performed. 4. The supply time of the drive voltage is stored in an electrically rewritable storage means, and the correction operation is to rewrite the supply time stored in the storage means. The shutter device for a camera according to claim 3, wherein 5. The driving means includes a solenoid having an electromagnetic drive source and a drive shaft moving forward and backward with respect to the electromagnetic drive source, wherein the shutter blade opens and closes in response to displacement of the drive shaft with respect to the electromagnetic drive source. 5. The shutter device for a camera according to claim 1, wherein the shutter device is operated. 6. A camera, wherein the camera shutter device according to claim 1 is arranged inside a camera housing on which a photographing lens is mounted.