JP2002040513A - Camera shutter device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To surely hold a shutter blade at a closing position and also to stabilize the traveling of the shutter blade in a camera shutter device. SOLUTION: This device is equipped with the shutter blade 20 provided so as to be movable between an opening position at which it opens an aperture part 10a for exposure and the closing position at which it closes the aperture part 10a, and a first electromagnetic driving source 30 to generate holding force by which driving force is directly exerted to the shutter blade at an energizing time and the shutter blade is held at the closing position at a non- energizing time, and it is also provided with a second electromagnetic driving source 40 by which movement is regulated by exerting pressing force in the same direction as that of the holding force by directly engaging with the first part to be pressed 25a of the shutter blade when the shutter blade is at the closing position and the pressing force is exerted by directly engaging with the other second part to be pressed 25b of the shutter blade right before the shutter blade is traveled.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to various types of cameras such as digital still cameras, silver halide film cameras, range finder cameras, etc. More particularly, the present invention relates to a camera shutter device in which shutter blades are directly driven by an electromagnetic drive source.

[0002]

2. Description of the Related Art From the viewpoint of simplifying the structure of a camera shutter device, a camera shutter device of a type that directly drives shutter blades using an electromagnetic drive source such as a motor has been developed. In this type of camera shutter device, the driving force generated by the electromagnetic drive source or the holding force for holding the shutter blade at a predetermined position in a non-energized state is small, so that the running operation when the shutter blade runs is unstable. The shutter blades held in the closed position may easily move due to shock or vibration from the outside, or the like, and the opening may be opened at times other than the exposure operation. In particular, as a camera shutter device which has taken measures against the above-mentioned insufficient holding force, for example, the one described in Japanese Utility Model Application Laid-Open No. Sho 56-7922 is known. In the camera shutter device disclosed in this publication, when the shutter blade is at a position where the opening is closed, a lock mechanism including a lever or the like that locks the rotation shaft of the electromagnetic drive source is provided, and prior to the release operation. The lock by the lock mechanism is released.

[0003]

In the case where a lock mechanism including the above-described levers is employed in order to cope with a shortage of a holding force or the like, a lever that constitutes the lock mechanism or engages with this lever. A peripheral member or the like is required, and a driving source or the like for performing the locking operation or the unlocking operation is required, so that the original purpose of simplifying the structure cannot be achieved. In addition, since the driving force of the electromagnetic drive source is relatively small, it is possible to prevent the shutter blades from rattling or the like immediately after the lock state is released by the lock mechanism, and to move the shutter blades at a predetermined timing from a predetermined position. It is necessary to ensure that the operation is performed stably.

The present invention has been made in view of the above problems, and has as its object to reduce the cost by simplifying the structure and reducing the number of parts.
It is an object of the present invention to provide a camera shutter device that can surely hold a shutter blade at a predetermined position and can perform a stable traveling operation when driving the shutter blade.

[0005]

A shutter device for a camera according to the present invention comprises at least one shutter blade, a drive arm for supporting the shutter blade and a supporting arm, and an opening for opening an exposure opening. A light-blocking means arranged so as to be able to travel between a position and a closed position to be closed, and a direct drive force to the light-blocking means when energized, and a holding force for holding the light-shielding means in the closed position when not energized. A first electromagnetic drive source, and a second electromagnetic drive source that directly engages with the light shielding means when the light shielding means is in the closed position, exerts an urging force in the same direction as the holding force, and regulates the movement thereof. It is characterized by. According to this configuration, when the light shielding unit is in the closed position, the magnetic holding force generated by the first electromagnetic drive source acts on the light shield unit, and the light shielding unit generates the magnetic force generated by the second electromagnetic drive source. The power acts. That is,
By applying the urging force of the second electromagnetic drive source to the holding force of the first electromagnetic drive source, the light-shielding means is securely held at the closed position without moving even in response to external impact or vibration.

In the above structure, the second electromagnetic drive source directly engages with the light shielding means and immediately opposes the holding force of the first electromagnetic drive source immediately before the light shielding means travels from the closed position to the open position. A configuration can be employed that exerts a biasing force on the orientation. According to this configuration, immediately before the light-shielding means travels, the second electromagnetic drive source releases the biasing force toward the closed position and generates the biasing force in a direction opposite to the holding force of the first electromagnetic drive source. Then, the light shielding means is pressed to a predetermined traveling start position to perform backlash. When the light blocking means starts running in this state, stable running is performed at a predetermined timing.

In the above configuration, it is possible to adopt a configuration in which the second electromagnetic drive source is formed so as to generate the above-mentioned urging force in a non-energized state. According to this configuration, the second electromagnetic drive source, in the non-energized state, applies an urging force to the light shielding unit in the same direction as the holding force of the first electromagnetic drive source, and also holds the first electromagnetic drive source. As a result, an urging force is generated that urges in a direction opposite to the force, and power consumption is reduced.

In the above construction, the light-shielding means directly engaging with the second electromagnetic drive source is a support arm or a shutter blade, and the support arm or the shutter blade has the second electromagnetic drive source when in the closed position. A first pushed portion to which the output portion for outputting the urging force is engaged and pushed, and an output for outputting the urging force of the second electromagnetic drive source immediately before the light shielding means travels from the closed position to the open position. It is possible to adopt a configuration in which a second pushed portion that is engaged and pushed by the portion is formed. According to this configuration, the biasing force of the second electromagnetic drive source is transmitted to the shutter blade via the first pushed portion or the second pushed portion formed on the support arm. When the first pushed portion or the second pushed portion is formed not on the support arm but on the shutter blade, the biasing force is directly transmitted to the shutter blade.

In the above configuration, the second electromagnetic drive source includes:
It is possible to adopt a configuration in which a spring that exerts an urging force in a direction in which the light blocking means is positioned at the closed position is provided.
According to this configuration, the biasing force of the spring is added to the holding force of the first electromagnetic drive source and the biasing force of the second electromagnetic drive source, so that the light shielding unit is more reliably held at the closed position.

[0010] In the above configuration, the light shielding means includes a leading blade pivotally supported by two sets of drive arms and a support arm;
The second electromagnetic drive source may include a rear blade, and the second electromagnetic drive source may be arranged to exert a biasing force on at least the front blade. According to this configuration, the above-mentioned urging force by the second electromagnetic drive source acts on the leading blade, so that the opening is reliably prevented from being opened before the shutter operation.

[0011]

Embodiments of the present invention will be described below with reference to the accompanying drawings. 1 to 3
1 shows an embodiment of a camera shutter device according to the present invention. FIG. 1 shows a state where a shutter blade is in a closed position where an opening is closed, and FIG. 2 shows a state where the shutter blade closes an opening and runs. FIG. 3 shows a state immediately before, that is, a state in which the shutter blade is in an open position in which the opening is opened by running. The camera shutter device according to the present embodiment is arranged such that a base plate 10 defining an opening 10a for exposure is movable on the base plate 10 between an open position where the opening 10a is opened and a closed position where the opening 10a is closed. Shutter blade 20, a first electromagnetic drive source 30 that exerts a direct driving force on the shutter blade 20 when energized or a holding force when not energized, and a second electromagnetic drive that exerts a predetermined urging force on the shutter blade 20. A source 40 and the like are provided as its basic configuration.

The first electromagnetic drive source 30 includes a rotor 31 having a drive pin (output portion) 31a magnetized on the north and south poles and outputting a driving force, an exciting coil 32, and a magnetic path. This is a moving magnet type electromagnetic actuator called an iris motor, which includes a cylindrical yoke 33 to be formed, magnetic pins 34 and 35 and the like. And FIG.
As shown in FIG. 7, when the shutter blade 20 is in the closed position, the N-pole of the rotor 31 is pulled by the magnetic pin 34 in a state where the coil 32 is not energized, and the rotor 31 rotates clockwise (holding force). As shown in FIG. 3, when the shutter blade 20 is in the open position, the S-pole of the rotor 31 is pulled by the magnetic pin 35 in a non-energized state, and the rotor 31 is rotated counterclockwise. A rotational urging force (holding force) is exerted around it.

The second electromagnetic drive source 40 is, similarly to the first electromagnetic drive source 30 described above, a rotor 41 provided with a drive pin (output portion) 41a that is magnetized to the N and S poles and outputs a driving force.
, An exciting coil 42, a cylindrical yoke 43 forming a magnetic path, and magnetic pins 44 and 45. As shown in FIG. 1, when the shutter blade 20 is in the closed position, the N-pole of the rotor 41 is pulled by the magnetic pin 44 while the coil 42 is not energized, and
When the shutter blade 20 is in a state immediately before traveling from the closed position to the open position as shown in FIG. 2 so as to apply a rotational biasing force in the clockwise direction, and as shown in FIG. Is pulled by the magnetic pin 45, and the rotor 41 exerts a rotational urging force in a counterclockwise direction.

As described above, since the first electromagnetic drive source 30 and the second electromagnetic drive source 40 have the same configuration, parts can be shared while using two electromagnetic drive sources, and the number of parts can be reduced. Can reduce management costs and parts costs.

The light shielding means is, as shown in FIGS.
A shutter blade 20 including a plurality of (here, three) blades 21, 22, 23;
Are constituted by a drive arm 24 and a support arm 25 which rotatably connect the respective members. This drive arm 2
The support arm 4 and the support arm 25 are rotatably supported by support shafts 10b and 10c provided on the back surface of the main plate 10, respectively. The drive arm 24 has an elongated hole 24a with which the drive pin 31a of the first electromagnetic drive source 30 is engaged.
The drive pin 31a of the first electromagnetic drive source 30 is
Is loosely inserted into the elongated hole 10d formed in the
0d is brought into contact with the drive pins 31a, so that the first
The rotation range of the electromagnetic drive source 30 (rotor 31) is restricted. In FIG. 1, the edge of the lower end of the blade 23 is an open edge, and when the shutter blade 20 travels to the open position, the opening 10a is opened by this open edge.

As shown in FIG. 1, the support arm 25 has
When the shutter blade 20 is at the closed position, the first pushed portion 25a to which the drive pin 41a of the second electromagnetic drive source 40 engages and is pushed, and as shown in FIG.
Immediately before the vehicle travels from the closed position to the open position, a second pushed portion 25b is formed that is engaged with and pushed by the drive pin 41a of the second electromagnetic drive source 40. The drive pin 41 a of the second electromagnetic drive source 40 is provided in the slot 1 formed in the base plate 10.
0e, and the drive pin 41a abuts on the right end of the elongated hole 10e and the first pushed portion 25a, so that the rotation range of the second electromagnetic drive source 40 (rotor 41) is increased. Regulated.

Next, the operation when the camera shutter device according to this embodiment is mounted on a digital still camera as an exposure shutter device will be described with reference to the time charts of FIGS. 1 to 3 and FIG. I will explain it.
The CCD (image pickup device) used in the digital still camera according to the present embodiment has an electronic shutter function by itself, and the photographer can use the optical viewfinder even if the shutter blade 20 is in the closed position. Observation is possible. Therefore, first, when the main switch of the camera is turned on, the CCD is also energized accordingly, and in this standby state for photographing, as shown in FIG.
The shutter blade 20 is in the closed position. At this time, the drive pin 31a of the first electromagnetic drive source 30 abuts on one end of the elongated hole 10d in a non-energized state, and further clockwise rotation is regulated, while the clockwise rotation urging force ( Holding power). On the other hand, the drive pin 41 of the second electromagnetic drive source 40
In the non-energized state, the shutter blades abut against the first pushed portion 25a (the left end of the elongated hole 10e is in a non-contact state), and the further clockwise rotation is regulated, while the shutter blades are controlled. 20
Is pressed slightly clockwise to exert a rotational urging force. In this state, the shutter blade 20 has the first
Since the urging force of the second electromagnetic drive source 40 is applied in addition to the holding force of the electromagnetic drive source 30, the shutter blade 20 is reliably held at the closed position.

In this standby state, when the photographer performs a release operation, as shown in FIG. 4, the second electromagnetic drive source 40 is rotated forward (counterclockwise) by a predetermined angle by energizing the coil 42. Then, as shown in FIG. 2, the drive pin 41a comes into contact with the second pushed portion 25b to exert a rotational urging force, thereby moving the shutter blade 20 slightly toward the open position. That is, when the urging force of the second electromagnetic drive source 40 acts in a direction opposite to the holding force of the first electromagnetic drive source 30, the shutter blades 20 are backlashed via the support arm 25, and Is positioned at a predetermined exposure start position.

Subsequently, while the electromagnetic urging force of the second electromagnetic drive source 40 is acting, as shown in FIG.
When the coil 32 is energized, the first electromagnetic drive source 30 rotates forward (rotates counterclockwise), and the shutter blade 20 travels to the open position as shown in FIG. Then, drive pin 3
1a abuts on the other end of the elongated hole 10d, further rotation is restricted, and the power supply to the coil 32 is cut off. At this time,
The holding force of the first electromagnetic drive source 30 acts in a direction for holding the shutter blade 20 at the open position. When the shutter blade 20 starts to move toward the open position, the second pushed portion 25b separates from the drive pin 41a of the second electromagnetic drive source 40, and the drive pin 41a is connected to the right end of the elongated hole 10e. And further rotation is regulated. further,
When the opening 10a is opened by the travel of the shutter blade 20, as shown in FIG. 4, the electronic shutter of the CCD (imaging element) is turned on for a predetermined time (exposure time) to perform imaging. . At this time, the shutter blade 2
0 is positioned at the above-mentioned predetermined exposure start position, so that the opening 10a
Since the timing until the electronic shutter of the CCD is turned ON after is released becomes constant, the control of the CCD becomes easy.

Thereafter, when the coil 32 is energized in the reverse direction, the first electromagnetic drive source 30 rotates in the reverse direction (clockwise rotation), and the shutter blade 20 again moves to the closed position as shown in FIG. The drive pin 31a abuts on one end of the elongated hole 10d, further rotation is restricted, the shutter blade 20 stops, and the power supply to the coil 32 is cut off. Further, the second electromagnetic drive source 40 rotates in the reverse direction (clockwise rotation) due to the reverse energization of the coil 42, and the drive pin 41a comes into contact with the first pushed portion 25a to slightly move the shutter blade 20. The coil 42 is pressed toward the closed position and further rotation is restricted, and the power supply to the coil 42 is cut off. As a result, the shutter blade 20 is securely held at the closed position by the holding force of the first electromagnetic drive source 30 and the urging force of the second electromagnetic drive source 40, and returns to the standby state. In the subsequent photographing, the above-described sequence is repeatedly performed.

In the above-described embodiment, as shown in FIG.
50 that exerts a biasing force in a direction in which it is positioned in the closed position.
May be provided. That is, as shown in FIG. 5, a tension type spring 50 is stretched between the protrusion 10f of the main plate 10 and the drive pin 41a. According to this configuration, as shown in FIG. 5A, when the shutter blade 20 is at the closed position, the urging force of the spring 50 is applied as a force for holding the shutter blade 20 at the closed position. Will be more securely held in the closed position. On the other hand, immediately before the shutter blade 20 travels, as shown in FIG. 5B, an urging force that opposes the force for rotating the rotor 41 in the forward direction acts.
It does not affect the travel of the shutter blades 20 and the load applied to the second electromagnetic drive source 40 is originally small, so that the second electromagnetic drive source 40 reliably performs a desired function.

Further, in the present embodiment, the first pushed portion 25a and the second pushed portion 25b are formed on the support arm 25.
The first pushed portion and the second pushed portion may be formed at the same time. That is, the support arm 2 of the blade 21 of the shutter blade 20
5 is extended in the direction of the drive pin 41a, and furthermore, the first pushed portion 2 is attached to the extended portion.
By forming a shape equivalent to 5a and the second pushed portion 25b, a first pushed portion and a second pushed portion that engage with the drive pin 41a can be formed. Even in such a case, the urging force of the second electromagnetic drive source 40 is directly applied to the shutter blade 20, so that the shutter blade 20 is securely held at the closed position, and further the backlash is performed, so that the predetermined exposure start position is obtained. Will be positioned.

FIGS. 6 to 9 show another embodiment of the camera shutter device according to the present invention, in which two sets of light-shielding means are provided, each of which has a pair of a drive arm and a support arm. It is composed of pivoted front and rear blades. 6 shows a state in which the front blade is in the closed position, FIG. 7 shows a state in which the front blade is just before traveling, FIG. 8 shows a state in which the front blade is in the open position, and FIG. 9 shows a state in which the rear blade is in the closed position. . The camera shutter device according to this embodiment includes:
A base plate 100 that defines an opening 100a for exposure, and a front blade 120 and a rear blade 130 that are movably arranged on the base plate 100 between an open position that opens the opening 100a and a closed position that closes the opening 100a. Shutter blades,
A first electromagnetic drive source 140 for the front blade that exerts a direct driving force on the front blade 120 when energized or a holding force when not energized
A second electromagnetic drive source 150 for the front blade that applies a predetermined urging force to the front blade 120, and a second electromagnetic drive source for the rear blade that directly applies a driving force to the rear blade 130 when energized or a holding force when not energized. One electromagnetic drive source 160 and the like are provided as its basic configuration.

The first electromagnetic drive source 140 for the leading blade includes a rotor 141 having a drive pin (output unit) 141a that is magnetized to the N and S poles and outputs a driving force, an exciting coil 142, , A moving magnet type electromagnetic actuator called an iris motor constituted by a cylindrical yoke 143 forming a magnetic path, magnetic pins 144 and 145 and the like. Then, as shown in FIG.
Is in the closed position, the N pole of the rotor 141 is pulled by the magnetic pin 144 while the coil 142 is not energized,
The rotor 141 exerts a rotational urging force (holding force) in a clockwise direction, and as shown in FIGS.
0 is in the open position, the rotor 141 is in a non-energized state.
Is pulled by the magnetic pin 145, and the rotor 141 exerts a rotational urging force (holding force) counterclockwise.

The second electromagnetic drive source 150 is, similarly to the first electromagnetic drive source 140, a rotor 151 having a drive pin (output portion) 151a magnetized to the N and S poles and outputting a driving force. , An exciting coil 152, a cylindrical yoke 153 forming a magnetic path, and magnetic pins 154 and 155. Then, as shown in FIG. 6, when the leading blade 120 is in the closed position, the N pole of the rotor 151 is pulled by the magnetic pin 154 in a state where the coil 152 is not energized, and the rotor 151 rotates clockwise. As shown in FIG. 7, when the leading blade 120 is in a state immediately before traveling from the closed position to the open position, the S-pole of the rotor 151 is applied to the magnetic pin 155 in a non-energized state. When pulled, the rotor 151 exerts a rotational urging force in a counterclockwise direction.

The first electromagnetic drive source 160 for the rear blade, like the above-mentioned electromagnetic drive sources 140 and 150, has a drive pin (output section) 161 which is magnetized to the N and S poles and outputs a driving force.
a, a coil 162 for excitation,
A cylindrical yoke 163 forming a magnetic path;
4, 165 and the like. Then, as shown in FIGS. 6 to 8, when the rear blade 130 is in the open position, the N pole of the rotor 161 is pulled by the magnetic pin 164 in a state in which the coil 162 is not energized, and the rotor 161 As shown in FIG.
As shown in the figure, when the rear blade 130 is in the closed position,
In the non-energized state, the S pole of the rotor 161 is pulled by the magnetic pin 165, and the rotor 161 exerts a rotational urging force (retention force) in a counterclockwise direction.

As described above, the first electromagnetic drive sources 140 and 16
By using the same configuration for the zero and second electromagnetic drive sources 150, parts can be shared while using three electromagnetic drive sources, and the management cost and component cost can be reduced by reducing the number of components. .

As shown in FIG. 6, one of the light-shielding means includes a front blade 120 composed of a plurality of (here, three) blades 121, 122, and 123, and these blades 121, 122, and 123.
Drive arms 124 for rotatably connecting the respective 123
And a support arm 125. The drive arm 124 and the support arm 125 are rotatably supported by support shafts 100b and 100c provided on the back surface of the main plate 100, respectively. The drive arm 124 has an elongated hole 124 a with which the drive pin 141 a of the first electromagnetic drive source 140 is engaged. The first electromagnetic drive source 140
Drive pin 141a is formed in the long hole 1 formed in the main plate 100.
00d, the first electromagnetic drive source 1 is brought into contact with the drive pins 141a at both ends of the elongated hole 100d.
The rotation range of 40 (rotor 141) is regulated.
In FIG. 6, the edge of the lower end of the blade 123 is an open edge, and when the leading blade 120 travels to the open position, the opening 100a is opened by this open edge.

As shown in FIG. 6, when the leading blade 120 is in the closed position, the first pusher 151 is engaged with and pushed by the drive pin 151a of the second electromagnetic drive source 150, as shown in FIG. The moving part 125a and the front blade 12 as shown in FIG.
Immediately before the zero travels from the closed position to the open position, a second pushed portion 125b is formed, which is engaged with and pushed by the drive pin 151a of the second electromagnetic drive source 150. The drive pin 151a of the second electromagnetic drive source 150 is loosely inserted into a long hole 100e formed in the main plate 100.
0e and the drive pin 1 on the first pushed portion 125a.
The rotation range of the second electromagnetic drive source 150 (the rotor 151) is restricted by the contact of the first electromagnetic drive source 51a.

As shown in FIG. 9, the other light-shielding means includes a rear blade 130 composed of a plurality of (here, three) blades 131, 132, 133, and these blades 131, 132,
Drive arms 134 for rotatably connecting the respective 133
And a support arm 135. The drive arm 134 and the support arm 135 are rotatably supported by support shafts 100g and 100h provided on the back surface of the main plate 100, respectively. The drive arm 134 has an elongated hole 134a with which the drive pin 161a of the first electromagnetic drive source 160 is engaged. The first electromagnetic drive source 160
Drive pin 161a is formed in the long hole 1 formed in the main plate 100.
00j, and the drive pin 161a abuts on both ends of the elongated hole 100j, so that the first electromagnetic drive source 1
The rotation range of 60 (rotor 161) is restricted.
In FIG. 9, the upper edge of the blade 133 is a closed edge, and when the rear blade 130 travels to the closed position, the opening 100a is closed by the closed edge.

As shown in FIG. 6, the other end of the spring 170 having one end hooked to the main plate 100 is hooked to the drive arm 134, and the rear blade 130 is turned to the open position. It always exerts a biasing force. As a result, the rear blade 130 is backlashed, and the closed edge is positioned at a predetermined exposure start position before traveling. In addition, the spring 170 for the backlash acts as a load on the first electromagnetic drive source 160 when the rear blade 130 travels for exposure, and thus affects the exposure time. In addition, when the rear blade 130 is arranged so as to always apply a biasing force toward the closed position, there is a possibility that the holding force of the first electromagnetic drive source 160 becomes insufficient when affected by an impact or the like. Therefore, instead of this spring 170,
A second electromagnetic drive source similar to the second electromagnetic drive source 150 of the leading blade 120 may be provided on the support arm 135 side.

Next, the operation when the camera shutter device according to this embodiment is mounted on a film-type camera as an exposure shutter device will be described with reference to FIGS.
And a time chart of FIG. First, in a standby state in which the main switch of the camera is turned on to wait for photographing, as shown in FIG. 6, the front blade 120 is at the closed position and the rear blade 130 is at the open position. At this time,
The drive pin 141a of the first electromagnetic drive source 140 abuts on one end of the long hole 100d in a non-energized state, and further clockwise rotation is regulated, while a clockwise rotation urging force (holding force). Has been exerted. On the other hand, the second electromagnetic drive source 15
In the non-energized state, the 0 drive pin 151a contacts the first pushed portion 125a (the left end of the elongated hole 100e is not in contact), and further clockwise rotation is restricted. Meanwhile, the front blade 120 is slightly pressed clockwise to exert a rotational urging force. In this state, the leading blade 12
In addition to the holding force of the first electromagnetic drive source 140, the urging force of the second electromagnetic drive source 150 is applied to 0, so that the leading blade 120 is reliably held at the closed position.
On the other hand, the drive pin 161a of the first electromagnetic drive source 160 abuts on one end of the elongated hole 100j in a non-energized state, and further clockwise rotation is regulated. Exerts a rotational urging force (holding force).
The rear blade 130 is backlashed by a spring 170.

In this standby state, when the photographer performs a release operation, as shown in FIG. 10, the second electromagnetic drive source 150 is rotated forward (counterclockwise) by a predetermined angle by energizing the coil 152. Then, as shown in FIG. 7, the drive pin 151a comes into contact with the second pushed portion 125b to exert a rotational urging force, thereby moving the leading blade 120 slightly toward the open position. That is, when the urging force of the second electromagnetic drive source 150 acts in a direction that opposes the holding force of the first electromagnetic drive source 140, the leading blade 120 is backlashed, and the open edge of the leading blade 120 is moved to a predetermined position. It is positioned at the exposure start position.

Subsequently, while the urging force of the second electromagnetic drive source 150 is acting, the first electromagnetic drive source 140 is rotated forward (counterclockwise) by energizing the coil 142 as shown in FIG. 8), and the leading blade 120 travels to the open position as shown in FIG. After that, the drive pin 141
a contacts the other end of the elongated hole 100d, further rotation is restricted, and the power supply to the coil 142 is cut off. At this time, the holding force of the first electromagnetic drive source 140 is acting in a direction to hold the leading blade 120 at the open position. When the leading blade 120 starts traveling toward the open position, the second pushed portion 125 b is driven by the drive pin 151 of the second electromagnetic drive source 150.
a and the drive pin 151a is
Further, further rotation is restricted by contacting the right end of e.
Further, after a lapse of a predetermined time from the activation of the first electromagnetic drive source 140, the first electromagnetic drive source 160 rotates forward (rotates counterclockwise) by energizing the coil 162 as shown in FIG. As shown in FIG. 9, the rear blade 130 travels to the closed position. Then, the drive pin 161a is inserted into the long hole 100j.
The rotation of the coil 162 is cut off by contact with the other end of the coil 162. At this time, the holding force of the first electromagnetic drive source 160 is acting in a direction for holding the rear blade 130 at the closed position. The exposure operation is performed by the traveling of the front blade 120 and the traveling of the rear blade 130, and the photographing is completed.

Thereafter, when the coil 142 is energized in the reverse direction, the first electromagnetic drive source 140 is reversed (rotated clockwise).
Then, as shown in FIG. 6, the front blade 120 again travels to the closed position, the drive pin 141a abuts on one end of the elongated hole 100d, further rotation is restricted, and the front blade 120 stops. The energization of the coil 142 is cut off. Further, in order to maintain the closed state of the opening 10a, the first electromagnetic drive source 160 is reversely rotated (clockwise) by applying a reverse current to the coil 162 slightly behind the reverse current to the coil 142. Rotation), and as shown in FIG.
Travels to the open position, and the drive pin 161a is
The rotation of the rear blade 130 is stopped by contacting one end of the coil 162, and the rear blade 130 is stopped, and the power supply to the coil 162 is cut off.

Further, simultaneously with the stop of the front blade 120, the second electromagnetic drive source 1
50 rotates in reverse (clockwise rotation), and the driving pin 151a
Abuts against the first pushed portion 125a, presses the front blade 120 slightly toward the closed position, restricts further rotation, and cuts off current to the coil 152. Thus, the leading blade 120 is securely held in the closed position by the holding force of the first electromagnetic drive source 140 and the urging force of the second electromagnetic drive source 150, and the trailing blade 130 is moved to the first electromagnetic drive source 16
By the holding force of 0 and the urging force of the spring 170, it is securely held at the open position, and enters a standby state. In the subsequent photographing, the above-described sequence is repeatedly performed.

In both of the above embodiments, an example is shown in which the camera shutter device is applied as an exposure shutter device. However, the present invention is not limited to this. For example, in a rangefinder camera, an exposure shutter device is used. It can also be applied as a shutter device for shielding light by arranging it in front of the device (on the subject side). In this case, the shutter device for shielding light is less affected by impact or the like, and the exposure start position of the open edge of the shutter blade becomes constant for each release,
The timing at which the exposure shutter device starts exposure after opening the opening after the light-blocking shutter device starts the opening operation can be suitably obtained. Further, since the link between the shutter device for light shielding and the shutter device for exposure is performed not by a mechanical mechanism but by electrical control,
The number of parts is reduced as compared with the case of using a mechanical mechanism, and the number of adjustment steps for manufacturing the shutter device can be reduced, so that the cost can be reduced.

Although the shutter blades in each of the embodiments are constituted by a plurality of blades, it is not always necessary to adopt such a constitution, and the shutter blades may be constituted by a single blade. Further, the first pushed portion and the second pushed portion are provided on either the support arm or the shutter blade. However, the first pushed portion is provided on the support arm.
The second pushed portion may be provided on the shutter blade, or each pushed portion may be provided in reverse.

[0039]

As described above, according to the camera shutter device of the present invention, the light-shielding means is provided in a standby state such as a photographing standby state while simplifying the structure and reducing the cost by reducing the number of parts. Can be reliably held in the closed position. Further, the light-shielding means can be positioned at the exposure start position, and the light-shielding means can run stably.

[Brief description of the drawings]

FIG. 1 is a plan view illustrating an embodiment of a camera shutter device according to the present invention, in which a shutter blade is at a closed position.

FIG. 2 is a plan view illustrating an embodiment of a camera shutter device according to the present invention, in which a shutter blade is in a state immediately before traveling.

FIG. 3 is a plan view illustrating an embodiment of a camera shutter device according to the present invention, in which a shutter blade is at an open position.

FIG. 4 is a time chart for explaining the operation of the camera shutter device.

5A and 5B show another embodiment of the camera shutter device according to the present invention, wherein FIG. 5A is a plan view showing a state where the shutter blade is at an open position, and FIG. It is a top view showing a state.

FIG. 6 is a plan view showing another embodiment of the camera shutter device according to the present invention, in which a front blade is at a closed position and a rear blade is at an open position.

FIG. 7 shows another embodiment of the camera shutter device according to the present invention, and is a plan view showing a state immediately before the leading blade runs.

FIG. 8 shows another embodiment of the camera shutter device according to the present invention, and is a plan view showing a state in which a leading blade travels to an open position.

FIG. 9 is a plan view showing another embodiment of the camera shutter device according to the present invention, showing a state in which a rear blade travels to reach a closed position.

FIG. 10 is a time chart for explaining the operation of the camera shutter device.

[Explanation of symbols]

 10a Opening 20 Shutter blade 21, 22, 23 Blade 24 Drive arm 24a Slot 25 Support arm 25a First pushed portion 25b Second pushed portion 30 First electromagnetic drive source 31a Drive pin (output portion) 40th 2 Electromagnetic drive source 41a Drive pin (output unit) 50 Spring 100a Opening 120 Front blade (shutter blade) 121, 122, 123 Blade 124 Drive arm 124a Long hole 125 Support arm 125a First pressed portion 125b Second pressed Moving part 130 Rear blade (shutter blade) 131, 132, 133 Blade 134 Drive arm 134a Long hole 135 Support arm 140 First electromagnetic drive source 141a Drive pin (output unit) 150 Second electromagnetic drive source 151a Drive pin (output unit) 160 first electromagnetic drive source 161a drive pin (output unit) 170 spring

Claims (6)

[Claims] 1. A vehicle comprising at least one shutter blade, a drive arm for drivingly supporting the shutter blade, and a support arm, and capable of traveling between an open position for opening an exposure opening and a closed position for closing. A first electromagnetic drive source for directly applying a driving force to the light-shielding unit when energized and generating a holding force for holding the light-shielding unit in the closed position when not energized; A second electromagnetic drive source that directly engages with the light blocking means when the shutter is in the closed position, exerts an urging force in the same direction as the holding force, and regulates the movement thereof. apparatus. 2. The second electromagnetic drive source directly engages with the light-shielding means immediately before the light-shielding means travels from the closed position to the open position, and holds the first electromagnetic drive source on the light-shielding means. The shutter device for a camera according to claim 1, wherein a biasing force in a direction opposite to the force is exerted. 3. The non-conductive state of the second electromagnetic drive source,
The camera shutter device according to claim 1, wherein the shutter device is configured to generate the urging force. 4. The light-shielding means which directly engages with the second electromagnetic drive source is the support arm or the shutter blade, wherein the support arm or the shutter blade has the light-shielding means when the shutter arm is in the closed position. (2) a first pushed portion that is engaged and pushed by an output portion that outputs an urging force of the electromagnetic drive source, and an urging force of the second electromagnetic drive source immediately before traveling from the closed position to the open position. The camera shutter device according to any one of claims 1 to 3, further comprising a second pushed portion that is engaged with and pushed by the output portion that outputs the signal. 5. The device according to claim 1, wherein the second electromagnetic drive source is provided with a spring that applies an urging force in a direction in which the light shielding unit is positioned at the closed position. Camera shutter device. 6. The light-shielding means has a front blade and a rear blade pivotally supported by two sets of the drive arm and the support arm, and the second electromagnetic drive source is attached to at least the front blade. The camera shutter device according to any one of claims 1 to 5, wherein the camera shutter device is arranged so as to exert an influence.