JP2002182267A - Shutter device with diaphragm - Google Patents

Abstract

PROBLEM TO BE SOLVED: To accomplish the miniaturization of a shutter device with a diaphragm. SOLUTION: A shutter blade 30 is constituted of two shutter blades 31 and 32, and a diaphragm blade 40 is constituted of two diaphragm blades 41 and 42, the driving of the shutter blades 31 and 32 and the diaphragm blades 41 and 42 is controlled by a single electromagnetic actuator 50, a driving lever 60 and a torsion spring 70 so as to diaphragm by the diaphragm blade 40 and also open/close the shutter blade 30. Then, an exposing operation and a diaphragming operation are surely performed, and also, a space required when the shutter blade 30 and the diaphragm blade 40 are retreated from the aperture part 10a is narrowed, then, the miniaturization of the device is accomplished.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a shutter device with a diaphragm mechanism mounted on a digital still camera or the like, and more particularly to a shutter blade for opening and closing an opening for exposure and a diaphragm blade for narrowing the diameter of the opening. The present invention relates to a shutter device with a diaphragm mechanism provided independently of the shutter device.

[0002]

2. Description of the Related Art An example of a shutter device with a diaphragm mechanism having a shutter blade for opening and closing an opening for exposure and a diaphragm blade for diaphragming the opening is disclosed, for example, in JP-A-10-22.
What is described in 1740 gazette is known. The shutter device with an aperture mechanism disclosed in this publication includes a shutter blade disposed reciprocally so as to open and close the opening in an outer peripheral region of the opening for exposure, and a first electromagnetic drive for driving the shutter blade. A source, aperture blades that are reciprocally arranged to stop and release the aperture, and a second electromagnetic drive source that drives the aperture blades.

[0003] By activating each electromagnetic drive source, the shutter blades open and close, and the aperture blades perform the aperture operation. Further, in a state where the respective electromagnetic drive sources are not energized, the shutter blades are held at the respective positions of the opening and closing positions of the opening, and the opening and closing of the opening and the standby position of the non-aperture. The diaphragm blade is configured to be held at each position.

[0004]

In the above-mentioned conventional shutter device with an aperture mechanism, since a separate electromagnetic drive source is provided as a drive source for driving the shutter blade and the aperture blade, a complicated interlocking mechanism is provided. Although the shutter blades and the aperture blades can be driven separately and independently without using such a device, however, since the separate electromagnetic drive sources are provided, an increase in the size, weight, and cost of the device are caused. In addition, the power consumption increases according to the number of the electromagnetic drive sources. Also, when driving the aperture blades, etc.,
Simply activating the electromagnetic drive source to move the aperture blades may cause a bouncing phenomenon or the like when positioning the aperture blade at a predetermined aperture position or the like, which is not preferable in terms of responsiveness when performing a rapid aperture operation.

The present invention has been made in view of the above-mentioned problems of the prior art, and an object of the present invention is to provide a structure in which a shutter blade and an aperture blade are interlocked without complicating the apparatus. It is an object of the present invention to provide a shutter device with a diaphragm mechanism that can be employed to reduce the size, weight, and cost of the device, and to allow the shutter blades and the diaphragm blades to reliably perform desired functions.

[0006]

According to the present invention, there is provided a shutter device provided with a diaphragm mechanism, comprising: a shutter blade movably disposed between an open position and a closed position with respect to an exposure opening; A diaphragm blade movably arranged between the retracted position and a shutter blade and a drive control mechanism for driving and controlling the diaphragm blade. The drive control mechanism causes the diaphragm blade to perform a diaphragm operation and opens and closes the shutter blade. A shutter device with an aperture mechanism for performing an operation, wherein the drive control mechanism includes: a shutter blade and a single electromagnetic drive source that applies a driving force to the aperture blade; Holding means capable of holding the blade at a predetermined position moved from the open position, wherein the diaphragm blades are slidable two-pieces whose apertures are reduced to a predetermined diameter by approaching each other. Consists diaphragm blades, the shutter blade is composed of two shutter blades to open and close the opening by spaced and adjacent to each other, it is characterized in that. According to this configuration, the exposure operation is performed by the single electromagnetic drive source bringing the two shutter blades close to each other to perform the closing operation, and the holding unit moves the two diaphragm blades closer to each other to set the aperture position. In this state, the single electromagnetic drive source causes the shutter blades to perform the closing operation, thereby performing the exposure operation from the aperture state. As described above, the shutter blade and the aperture blade are formed by the two blades, and the opening and closing and the aperture are performed by the cooperation of the two blades. The space when the aperture blades are retracted from the opening can be narrowed, and the size of the apparatus can be reduced.

In the above configuration, the drive control mechanism may be configured to have a swingable drive lever interposed between the shutter blade and the aperture blade and the electromagnetic drive source to transmit a driving force. According to this configuration, the driving amount (for example, the operating angle) of the electromagnetic driving source is amplified by the driving lever and transmitted to the shutter blade and the aperture blade, so that it is possible to cope with an increase in the diameter of the exposure opening. Even if a small electromagnetic drive source having a relatively small drive amount is used, desired exposure operation and aperture operation can be performed.

In the above configuration, the electromagnetic drive source is constituted by an electromagnetic actuator having an output pin for outputting a driving force to the outside and a rotor rotating in a predetermined angle range, and the drive lever is formed on a shutter blade. A driving pin inserted into and engaged with the second connection hole formed in the first connection hole and the aperture blade, and a connection hole formed between the swing center and the drive pin and connected to the output pin. A configuration can be employed. According to this configuration, when the output pin rotates, the driving force is transmitted to the drive lever through the connection hole, the drive lever swings around the swing center, and the drive pin is moved to the first connection hole and The shutter blade and the aperture blade are moved through the second connection hole. As described above, while the drive amount of the electromagnetic drive source is amplified by the simple configuration, the movement direction of the output pin of the electromagnetic drive source and the movement direction of the drive pin of the drive lever are oriented toward the center of the exposure opening. It can be. Thus, it is possible to adopt an arrangement configuration in which the components are placed as close to the opening as possible, and it is possible to reduce the size of the apparatus by consolidating the components around the opening.

In the above structure, the first connection hole formed in the shutter blade has a first play allowance in which the drive pin can move, and the second connection hole formed in the aperture blade has the first connection hole in which the drive pin moves. A configuration can be employed that has a second play allowance that is greater than the first play allowance. According to this configuration, it is possible to set an area where the shutter blade and the aperture blade do not operate even when the drive pin operates. That is, while the shutter blade and the aperture blade perform the complete closing operation and the aperture operation, useless movement in the area evacuated from the opening can be restricted, and the width of the space at the time of evacuation can be reduced. Further, by making the second play allowance larger than the first play allowance, in a configuration in which the shutter blade and the aperture blade are driven in conjunction with each other by the drive pin, the shutter blade performs a complete closing operation while the shutter blade performs a complete closing operation. Can easily be formed with a function of holding the lens at the aperture position.

In the above structure, the holding means may be constituted by a spring which exerts an urging force for holding the drive lever at a position corresponding to when the aperture blade is at the aperture position and the shutter blade is at the predetermined position. it can. According to this configuration, the diaphragm blade can be held at the diaphragm position by a simple configuration of a spring, and the power consumption, simplification, and weight reduction of the device can be achieved.

In the above configuration, the spring may further apply a biasing force for holding the drive lever at a position corresponding to when the aperture blade is at the retracted position and the shutter blade is at the open position. According to this configuration,
In the standby state (resting state), by the urging force of the spring,
Since the shutter blades and the aperture blades are held at the open position and the retracted position, the power consumption, simplification, and weight reduction of the apparatus can be achieved.

In the above construction, the spring comprises a first stable position at which the deformation energy is reduced when the drive lever is located at a position corresponding to when the aperture blade is at the aperture position and the shutter blade is at the predetermined position; It is possible to adopt a configuration having a second stable position in which the deformation energy is reduced when the drive lever is located at a position corresponding to when the blade is at the retracted position and the shutter blade is at the open position. According to this configuration, the shutter blade and the aperture blade are held in the standby state and the aperture state by one spring, so that the apparatus can be further simplified, reduced in weight, reduced in cost, and the like.

[0013]

Embodiments of the present invention will be described below with reference to the accompanying drawings. 1 to 15
1 shows an embodiment of a shutter device with a diaphragm mechanism according to the present invention. 5, 9 and 13 show only the shutter blades, FIGS. 6, 10 and 14 show only the aperture blades, and FIGS. 7, 11 and 1
In FIG. 5, what should be indicated by a dotted line is indicated by a solid line. As shown in FIGS. 1 to 4, the shutter device with an aperture mechanism according to this embodiment has openings 10a and 2 for exposure.
0a, the base plate 10 and the cover plate 20, the shutter blades 30 (31, 32) slidably disposed on the base plate 10, and the diaphragm blades 40 (41, 4) slidably disposed on the base plate 10.
2) and a single electromagnetic drive source 50, a drive lever 60, a torsion spring 70 (holding means) as a drive control mechanism for controlling the drive of the shutter blade 30 and the aperture blade 40, and the like.

As shown in FIGS. 1 and 4, the electromagnetic drive source 50 is integrally formed with an output pin 51a which is magnetized in two poles and outputs a driving force at a position deviated by a predetermined distance from the center of rotation. A rotor 51 rotatably supported in a predetermined angle range, a coil 52 for excitation, and a cylindrical yoke 53
This is an electromagnetic actuator (a so-called moving magnet motor) configured by the above-described method, and is fixed to the base plate 10 via the holding member 54.

As shown in FIGS. 1 and 4, the drive lever 60 is swingably supported by a support shaft 11 projecting from the upper surface of the main plate 10 at a position deviated from the rotation center of the rotor 51. It has a drive pin 61 formed on the end side, a connection hole 62 formed between the swing center (support shaft 11) and the drive pin 61, and the like. The output pin 51a of the rotor 51 is inserted into the connection hole 62, and the drive pin 61 is inserted into the first connection holes 31b and 32b of the shutter blade 30 and the second connection holes 41b and 42b of the aperture blade 40, which will be described later. I have.

As shown in FIGS. 2 and 5, the shutter blades 30 include light shielding portions 31a and 32a,
First connecting holes 31b, 32b into which holes are inserted, and arc holes 31
The shutter blades 31 and 32 have two shutter blades 31 and 32 having a pair of shutter blades c and 32c. As shown in FIGS. The two shutter blades 31, 32 open and close the opening 10a by being separated from and approaching each other. Also, the first connection holes 31b,
As shown in FIG. 2, 32b is formed so as to have a first play allowance W1 in which the drive pin 61 can move freely (moves without contact with the inner edge portion). Further, as shown in FIGS. 5 and 7, one side portions 31c ', 32c' of the arc holes 31c, 32c.
Have springs 80, 90 arranged around the support shafts 12, 13.
End portions 81 and 91 are hooked.

As shown in FIGS. 3 and 6, the aperture blade 40 has aperture edges 41a and 42a, second connection holes 41b and 42b into which the drive pin 61 is inserted, and arc holes 41c and 41c.
As shown in FIGS. 1 and 5, the diaphragm blades 41 and 42 have two diaphragm blades 42 and 42 and are swingably supported by support shafts 12 and 13 protruding from the back surface of the base plate 10. The two diaphragm blades 41 and 42 are configured to narrow the opening 10a to a predetermined diameter by approaching each other. Further, as shown in FIG. 2, the second connection holes 41b and 42b allow the drive pin 61 to move freely (move in a non-contact manner with the inner edge portion) and provide a second play allowance W2 larger than the first play allowance W1. It is formed to have. Further, as shown in FIGS. 6 and 7, one side 41c of the arc holes 41c, 42c.
', 42c' are hooked with the other ends 82, 92 of springs 80, 90 arranged around the support shafts 12, 13, respectively.

The shutter blade 30 and the aperture blade 40
Between them, the urging forces of the springs 80 and 90 act to urge the shutter blade 31 to rotate counterclockwise and the diaphragm blade 41 to rotate clockwise around the support shaft 12. Further, around the support shaft 13, the shutter blade 32
Are urged to rotate clockwise and the aperture blades 42 rotate counterclockwise.

The shutter blade 30 is provided with a spring 100 for exerting a biasing force toward the opening side. That is, as shown in FIGS. 1, 4 and 7, the spring 100 is arranged around the support shaft 14 protruding from the upper surface of the main plate 10, and one end portion 101 of the spring 100 is detachable from the hooking portion 10 b of the main plate 10. , And the other end 102 is hooked on a hooking projection 54 a projecting from the back surface of the holding member 54.

As shown in FIGS. 4, 5, and 7, when the shutter blade 30 is in the open position, the edge 31d of the shutter blade 31 is not engaged with the one end 101 and is separated. As shown in FIG. 11, when the shutter blade 30 is at a predetermined position (intermediate position) corresponding to when the aperture blade 40 is at the stop position, the edge 31 of the shutter blade 31
When the shutter blade 30 is engaged with the one end portion 101 and the shutter blade 30 is between the predetermined position and the closed position (for example, when the shutter blade 30 is in the closed position as shown in FIG. 15), the edge portion 31d causes the one end portion 101 to move. Is pushed out of the hooking portion 10b, and the spring force is charged. Then, when the one end portion 101 pushes back the edge portion 31d, the shutter blade 31, that is, the shutter blade 30 is urged toward the opening side.

A torsion spring 70 as a holding means is shown in FIG.
As shown in FIGS. 4, 8, and 12, a coil portion 71 supported around a support shaft 15 (predetermined position) protruding from the upper surface of the main plate 10, and a drive pin 61 extending from the coil portion 71.
Free ends 72, 7 that intersect and pinch
3.

As shown in FIG. 8, the torsion spring 70 is connected to the swing center (support shaft 11) of the drive lever 60 and the support shaft 15
A predetermined distance upward from a straight line L connecting
A first stable position where the deformation energy is reduced,
Further, as shown in FIG. 4, a second stable position where the deformation energy is reduced is provided at a position below the straight line L by a predetermined distance.

That is, the torsion spring 70 is attached so as to hold the aperture blade 40 at the aperture position and the shutter blade 30 at the predetermined position (intermediate position) moved from the open position at the first stable position. In the second stable position, a biasing force is applied so as to hold the aperture blade 40 at the retracted position and the shutter blade 30 at the open position. As described above, since the shutter blade 30 and the aperture blade 40 can be held at predetermined positions without energizing the electromagnetic drive source 50, power consumption can be reduced. Further, compared with the case where the magnetic drive source 50 is provided with a magnetic pin or the like and the magnetic drive force is used to hold the electromagnetic drive source 50, the variation in the holding force is reduced, and the number of components is reduced.

Next, the operation when the shutter device with the aperture mechanism according to the above embodiment is mounted on, for example, a digital still camera will be described with reference to the operation diagrams of FIG. 4 to FIG. A digital still camera equipped with this shutter device with an aperture mechanism includes a control unit (CPU or the like) as control means for controlling various controls, a CCD as an image sensor, and a process for storing image signals output from the CCD. An image signal processing circuit, a photometric circuit, a distance measuring circuit, a shutter release switch for performing a shutter release operation, a main switch, and the like are provided.

First, when the photographer turns on the main switch, the CCD is turned on by the control signal output from the control unit.
It becomes N state and is operated. At this time, the shutter blade 30 (31, 32) is located at the open position where the opening 10a is fully opened, and the aperture blade 40 (41, 42) is positioned at the opening 10a.
It is located at the evacuation position that is out of the way. That is, when the electromagnetic drive source 50 is not energized, the torsion spring 70
In a stable position, and as shown in FIG.
Is held clockwise.

As a result, as shown in FIG. 5, the drive pin 61 is connected to the first connection holes 31b, 3 of the shutter blades 31, 32.
The shutter blades 31, 2b are engaged with the lower inner edges of the second connection holes 41b, 42b of the aperture blades 41, 42 and pressed as shown in FIG.
The edge of the shutter blade 32 contacts the stoppers 10c and 10d, the shutter blades 31 and 32 are in the open position, and the aperture blades 41 and 42
Is held in the retracted position. At this time, the aperture blades 41 and 42 are held at the retracted positions by the urging forces of the springs 80 and 90 determined by the positional relationship with the shutter blades 31 and 32.

As described above, in the state where the opening 10a is opened, the subject light reaches the CCD, and based on the output signal of the CCD, the control unit determines whether or not to stop the aperture by the appropriate aperture value, that is, the aperture blade 40. The determination is made and the exposure time (shutter second) is calculated. Then, in the operation mode in which the diaphragm blade 40 does not perform the diaphragm operation, the camera stands by in preparation for photographing in the state shown in FIGS.

When a release operation is performed in a standby state in which the aperture is not performed, the CCD is reset by a control signal from the control unit. Subsequently, when the CCD starts accumulating electric charges and a predetermined time has elapsed, the electromagnetic drive source 50 is energized to a predetermined level or more. It is to be noted that energization of a predetermined level or more means that the maximum urging force of the torsion spring 70 (the drive pin 6
1 is on the straight line L) and the spring 100
(The spring force generated from the time when the edge 31d is engaged with the one end 101 and deformed), and the rotor 51
And applying a voltage sufficient to rotate the counterclockwise.

As a result, the rotor 51 is moved counterclockwise and the drive lever 6 is moved from the state shown in FIG.
Zero also starts to rotate counterclockwise. At this time, the drive pin 6
1 quickly moves the first play allowance W1 in the first connection holes 31b and 32b and the second play allowance W2 in the second connection holes 41b and 42b, and as shown in FIG. 31b,
32b only engages with the upper inner edge (as shown in FIG. 9,
The first connection holes 31b and 32b are engaged with the upper inner edges, but are not in contact with the upper inner edges of the second connection holes 41b and 42b as shown in FIG. 10).
1, 32 are started to close.

As a result, as shown in FIGS. 13 and 15, the shutter blades 31 and 32 are immediately moved to the closed position, and their edges come into contact with the stoppers 10e or 10f and stop. As shown in FIG. 15, the diaphragm blades 41 and 42 are also moved to the diaphragm position in cooperation with the springs 80 and 90, and the edges thereof are stopped by the stoppers 10g and 1g.
Stops by touching 0h. Thus, the exposure operation is completed.

At this time, the drive pin 61 is
1b, 32b while being engaged with the upper inner edges thereof,
The second play allowance W2 is moved while maintaining a non-contact state with the upper inner edge portions of the first and second upper portions 1b and 42b. That is, since the second play allowance W2 is larger than the first play allowance W1, only the shutter blade 30 is further closed from the predetermined position (intermediate position) corresponding to the stop position in a state where the stop blade 40 is stopped at the stop position. You can move toward. Further, the edge portion 31d of the shutter blade 31 presses the one end portion 101 to separate from the engaging portion 10b and deforms the spring portion 100, so that the spring 100 is charged with a spring force for urging the shutter blade 30 toward the opening side. It is in a state of being left.

In the above series of operations, the shutter 1 opens the opening 1 after the CCD is turned on.
The exposure time is a period until 0a is closed. continue,
The control unit performs control to take in a signal of the captured image via an image signal processing circuit or the like, and stores the signal in a storage unit such as a memory card. Thus, one shooting operation is completed.

Thereafter, when a reverse output of a predetermined level or more is applied to the electromagnetic drive source 50 by a signal output from the control unit, the urging force of the spring 100 also acts, and the state shown in FIGS. , The rotor 51 starts to rotate clockwise and the drive lever 60 starts to rotate clockwise. When the current is applied to a predetermined level or more, the urging force of the spring 100 acts as an auxiliary force, and a voltage sufficient to overcome the maximum urging force of the torsion spring 70 and rotate the rotor 51 clockwise is applied. Things.

The drive pin 61 is connected to the first connection hole 31.
b, 32b are separated from the upper inner edge portion, and the first connection holes 31 are removed.
b, 32b, the first allowance W1 and the second connecting hole 41b,
The second play allowance W2 in 42b is quickly moved to engage with the lower inner edges of the first connection holes 31b and 32b, and then engage with the lower inner edges of the second connection holes 41b and 42b. The shutter blades 31 and 32 are caused to start the opening operation.
42 causes an aperture release operation to start. As a result, the shutter blades 31, 32 are immediately moved to the open position,
The edges contact the stoppers 10c and 10d and stop.
Further, the diaphragm blades 41 and 42 are moved to the retracted position, and are held by the urging force of the torsion spring 70 that has reached the second stable position.

Thereafter, even when the power supply to the electromagnetic drive source 50 is cut off, the shutter blades 30 and the aperture blades 40 are held at the open position and the retracted position by the action of the torsion spring 70, respectively. That is, the power consumption can be reduced by holding the shutter blades 30 and the aperture blades 40 without energizing the electromagnetic drive source 50.

On the other hand, in the operation mode in which the control unit determines that the aperture is to be stopped by the aperture blade 40 based on the output signal of the CCD exposed to the subject light, first, the signal output from the control unit is used to control the electromagnetic force. The drive source 50 is energized at a predetermined level. Then, the rotor 51, that is, the drive lever 60 overcomes the maximum urging force of the torsion spring 70,
It rotates counterclockwise from the second stable position shown in FIG. 4 to the first stable position shown in FIG.

At the same time, the driving pin 61 of the driving lever 60
Engages with the upper inner edges of the first connection holes 31b and 32b, and moves the shutter blades 31 and 32 to a predetermined position (an intermediate position between the open position and the closed position) as shown in FIG.
, And the edge 31 d engages with one end 101 of the spring 100. Also, the aperture blades 41 and 42 are
The shutter blades 31, 32 are actuated by the urging forces of the springs 80, 90.
In conjunction with the above operation, as shown in FIG. 10, the diaphragm reaches the stop position and its edges abut against the stoppers 10g and 10h and stop. At this time, the shutter blade 30 and the diaphragm blade 40 are suppressed or prevented from bounding, and are quickly positioned at a predetermined position due to the relationship between the urging forces of the springs 80 and 90, the urging force of the torsion spring 70, and the like. .

When the power supply to the electromagnetic drive source 50 is cut off, the torsion spring 70 tries to stay at the first stable position shown in FIG. , 32 are held at predetermined positions (intermediate positions), and the aperture blades 41, 42 are positioned and held at the aperture position, and stand by in preparation for photographing.

As described above, even when the power supply to the electromagnetic drive source 50 is cut off, the action of the torsion spring 70 causes the shutter blade 3
0 and the aperture blade 40 are at predetermined positions (intermediate positions), respectively.
Further, since the lens is held at the aperture position, power consumption can be reduced as compared with the case where the shutter is held by energization.

When a release operation is performed in this standby state, the CCD is reset by a control signal output from the control unit. Subsequently, the CCD starts accumulating charges,
At a point in time when the predetermined time has elapsed, the electromagnetic drive source 50 is driven so that the rotor 51, that is, the drive lever 60 overcomes the urging force of the spring 100 that gradually increases and further rotates counterclockwise.
Is supplied with a current equal to or higher than a predetermined level. As a result, FIG.
12 to the state shown in FIG. 12, the rotor 51 rotates counterclockwise, the shutter blades 31 and 32 are moved to the closed position, and their edges come into contact with the stopper 10e or 10f and stop. Thus, the exposure operation is completed.

At this time, the driving pin 61 is
As shown in FIG. 3, it moves while pressing the upper inner edges of the first connecting holes 31b and 32b, but does not contact the upper inner edges of the second connecting holes 41b and 42b as shown in FIGS. 1 and the diaphragm blades 41, 42 are thus
As shown in FIG. 4, the edge portions abut against the stoppers 10g and 10h to maintain the state in which they are held at the throttle position. Further, as shown in FIGS. 13 and 15, the edge portion 31d presses the one end portion 101 to deform it, so that the spring 10
Zero is charged with the spring force.

In the above series of operations, the shutter 1 opens the opening 1 after the CCD is turned on.
The exposure time is a period until 0a is closed. continue,
The control unit performs control to take in a signal of the captured image via an image signal processing circuit or the like, and stores the signal in a storage unit such as a memory card. This completes one photographing operation.

Thereafter, when the power to the electromagnetic drive source 50 is cut off by a signal output from the control unit, the spring 100
The shutter blades 31 and 32 are returned to the predetermined positions (intermediate positions) shown in FIGS. 9 and 11 by the urging force, and the torsion spring 70 tries to stay at the first stable position.
It will wait again in the aperture state. On the other hand, when the aperture state is released after photographing, power is supplied to the electromagnetic drive source 50 in the opposite direction and at a predetermined level or more, so that the shutter blades 31 and 32 and the aperture blades 41 and 42 are in the open position and the standby position, respectively. Will be returned to position.

FIGS. 16 to 19 show another embodiment of the shutter device with an aperture mechanism according to the present invention.
The present embodiment is the same as the above-described embodiment except that the torsion spring 70 and the spring 100 are changed. 17 shows a state in which the shutter blade 30 and the aperture blade 40 are at the open position and the retracted position, respectively. FIG.
FIG. 19 shows a state where the aperture blade 40 is at the predetermined position (intermediate position) and the aperture position, respectively, and FIG. 19 shows a state where the shutter blade 30 is at the closed position while the aperture blade 40 is held at the aperture position. .

In this embodiment, a torsion spring 170 as a holding means and a spring 200 for urging the shutter blade 30 to the open side are provided. Torsion spring 170
As shown in FIGS. 16 and 17, a coil portion 171 supported with play around a support shaft 15 (predetermined position) protruding from the upper surface of the main plate 10, and extending from the coil portion 171 and hooked at a predetermined position. Two free ends 172, 17 stopped
And 3. That is, the coil portion 171 has a diameter larger than the outer diameter of the support shaft 15, and one free end portion 172 is hooked on the hooking projection 10 j projecting from the upper surface of the main plate 10, and projects from the back surface of the holding member 54. Hooking projection 54b
Is hooked to the other free end 173. The coil portion 171 is urged to engage with the drive pin 61 (outer edge portion 61a), and in the engagement direction,
It is free to move within the range of play allowance with the support shaft 15.

The torsion spring 170 is, as shown in FIG.
When the drive pin 61 is located at a position above the straight line L connecting the swing center (support shaft 11) of the drive lever 60 and the support shaft 15 by a predetermined distance, the first stable position at which the deformation energy is reduced. Also, as shown in FIG. 17, when the drive pin 61 is located at a position below the straight line L by a predetermined distance, the second pin has a second stable position where its deformation energy is reduced. .

That is, in the first stable position, the torsion spring 170 moves the aperture blade 40 to the aperture position and moves the shutter blade 30 from the open position to a predetermined position (intermediate position).
Exerts an urging force to maintain the throttle state at
In the second stable position, an urging force is applied so as to hold the aperture blade 40 at the retracted position and the shutter blade 30 at the open position.

As described above, since the shutter blades 30 and the aperture blades 40 can be held at predetermined positions without energizing the electromagnetic drive source 50, power consumption can be reduced. Further, compared with the case where the magnetic drive source 50 is provided with a magnetic pin or the like and the magnetic drive force is used to hold the electromagnetic drive source 50, the variation in the holding force is reduced, and the number of components is reduced. Furthermore, since the coil portion 171 moves directly, the torsion spring 170 has the most unstable swing center (support shaft 11) and support center (support shaft 15) in the most unstable state as compared with the torsion spring 70 described above. Can be set shorter, and the size can be further reduced by consolidating the devices.

The spring 200 is arranged so as to bias the shutter blade 30 toward the open side. That is, as shown in FIGS. 16 and 17, the spring 200 is disposed around the support shaft 14 protruding from the upper surface of the base plate 10, and one end portion 201 of the spring 200 projects from the upper surface of the base plate 10.
The other end 202 is hooked on a hooking projection 54 a projecting from the back surface of the holding member 54.

As shown in FIG. 17, when the shutter blade 30 and the aperture blade 40 are in the open position and the retracted position, the drive pin 61 is not engaged with the one end 201 and is separated, as shown in FIG. In addition, when the shutter blade 30 and the aperture blade 40 are at the predetermined position (intermediate position) and the aperture position, the drive pin 61 is engaged with the one end 201, and the shutter blade 30 is between the predetermined position and the closed position. Sometimes (eg, when in a closed position, as shown in FIG. 19)
One end 201 is pushed by the drive pin 61 and the locking projection 1
0j, and the spring force is charged.
The one end 201 pushes the drive pin 61 back to urge the shutter blade 30 toward the open side. The torsion spring 170 and the spring 200
And the operations of the shutter blades 30 and the aperture blades 40 are the same as those in the above-described embodiment, and a description thereof will be omitted.

In the above embodiment, the torsion springs 70 and 170 are employed as holding means for holding the aperture blade 40 at the aperture position and the shutter blade 30 at a predetermined position.
The spring is not limited to this, and another spring may be used. In the above embodiment, the torsion spring 7 is used.
0 and 170 have a first stable position and a second stable position, and the shutter blade 30 and the aperture blade 40
Is held at the predetermined position and the stop position, and at the open position and the retracted position. However, it is also possible to adopt a structure where the spring is held by using separate springs. Further, in the above-described embodiment, the rotary electromagnetic actuator including the rotor 51 is employed as the electromagnetic drive source. However, the present invention is not limited to this. Other electromagnetic actuators may be employed.

[0052]

As described above, according to the shutter device with the aperture mechanism of the present invention, the shutter blade and the drive control mechanism for controlling the drive of the aperture blade are provided with a single electromagnetic drive source and an aperture drive. Holding means for holding the aperture blade at the aperture position and holding the shutter blade at a predetermined position moved from the open position, wherein the aperture blade is comprised of two aperture blades, and the shutter blade is comprised of two shutter blades. Accordingly, while reducing the number of parts and reducing the weight, the space when the shutter blades and the aperture blades are retracted from the opening can be narrowed, and the size of the apparatus can be reduced.

In particular, by interposing a drive lever between the shutter blade and the aperture blade and the electromagnetic drive source, not only the drive amount (for example, the operating angle) of the electromagnetic drive source can be amplified, but also the electromagnetic drive source can be amplified. The direction of movement of the output pin and the direction of movement of the drive pin of the drive lever can be arranged toward the center of the exposure opening, and the size of the device can be reduced by consolidating components around the opening. Can be.

The first connecting hole of the shutter blade and the second connecting hole of the aperture blade are provided with a first play allowance and a second play allowance for the drive pin to move, and the latter is set larger than the former. As a result, the electromagnetic drive source can be started at an accelerated rate, whereby the speed of the exposure operation can be increased, and the approach section can be shortened. Further, in a configuration in which the shutter blade and the aperture blade are driven in conjunction with each other by the drive pin, a function of holding the aperture blade at the aperture position while allowing the shutter blade to perform a complete closing operation can be easily formed. Further, a spring (torsion spring) is employed as a holding means, and the biasing force of the spring allows the shutter blade and the aperture blade to be held at a predetermined position and an aperture position, or at an open position and a retracted position. Power consumption can be reduced while simplifying, reducing the weight, and reducing the cost.

[Brief description of the drawings]

FIG. 1 is a sectional view showing an embodiment of a shutter device with a diaphragm mechanism according to the present invention.

FIG. 2 is a plan view showing a shutter blade.

FIG. 3 is a plan view showing an aperture blade.

FIG. 4 is a plan view showing an external appearance of the shutter device with a diaphragm mechanism and showing a state where an opening is opened.

FIG. 5 is a plan view showing a state where a shutter blade is at an open position.

FIG. 6 is a plan view showing a state where the aperture blade is at a retracted position.

FIG. 7 is a plan view showing a state where a shutter blade is at an open position and an aperture blade is at a retracted position.

FIG. 8 is a plan view showing the external appearance of the shutter device with a diaphragm mechanism and showing a state in which the opening is narrowed to a predetermined diameter.

FIG. 9 is a plan view showing a state where a shutter blade has moved from an open position and is at a predetermined position (intermediate position).

FIG. 10 is a plan view showing a state where the diaphragm blade is at a diaphragm position.

FIG. 11 is a plan view showing a state where a shutter blade is at a predetermined position (intermediate position) and an aperture blade is at an aperture position.

FIG. 12 is a plan view showing an external appearance of the shutter device with a diaphragm mechanism and showing a state in which an opening is closed.

FIG. 13 is a plan view showing a state where shutter blades are in a closed position.

FIG. 14 is a plan view showing a state of the aperture blade when the shutter blade is at a closed position.

FIG. 15 is a plan view showing a state where a shutter blade is at a closed position and an aperture blade is at an aperture position.

FIG. 16 is a sectional view showing another embodiment of the shutter device with a diaphragm mechanism according to the present invention.

FIG. 17 is a plan view showing an external appearance of the shutter device with a diaphragm mechanism and showing a state where an opening is opened.

FIG. 18 is a plan view showing the external appearance of the shutter device with a diaphragm mechanism, and showing a state where the opening is narrowed to a predetermined diameter.

FIG. 19 is a plan view showing an external appearance of the shutter device with a diaphragm mechanism and showing a state in which an opening is closed.

[Explanation of symbols]

 10a, 20a Opening 30 (31, 32) Shutter blade 31b, 32b First connection hole 40 (41, 42) Aperture blade 41b, 42b Second connection hole 50 Electromagnetic actuator (electromagnetic drive source) 51 Rotor 51a Output pin 60 Drive Lever 61 Drive pin 62 Connection hole 70 Torsion spring (holding means) 71 Coil part 72, 72 Free end 170 Torsion spring (holding means) 171 Coil 172, 172 Free end W1 First play allowance W2 Second play allowance

Claims (7)

[Claims] 1. A shutter blade movably disposed between an open position and a closed position with respect to an exposure opening, and a diaphragm movably disposed between a stop position and a retracted position with respect to the opening. A shutter device with a diaphragm mechanism, comprising: a blade; and a drive control mechanism for drivingly controlling the shutter blade and the aperture blade, wherein the drive control mechanism causes the diaphragm blade to perform a diaphragm operation and causes the shutter blade to perform an opening / closing operation. A drive control mechanism includes: a single electromagnetic drive source that exerts a driving force on the shutter blade and the aperture blade; and a diaphragm blade at the aperture position and a shutter blade at the open position during aperture operation. Holding means capable of holding at a predetermined position moved from the aperture blades, wherein the diaphragm blades are two swingable plates that narrow the opening to a predetermined diameter by approaching each other. Ri consists blade, said shutter blade consists of two shutter blades to open and close the opening by spaced and adjacent to each other, the diaphragm mechanism with a shutter device, characterized in that. 2. The drive control mechanism according to claim 1, wherein the drive control mechanism has a swingable drive lever that transmits a drive force between the shutter blade and the aperture blade and the electromagnetic drive source. A shutter device with an aperture mechanism according to claim 1. 3. The electromagnetic driving source includes an electromagnetic actuator having an output pin for outputting a driving force to the outside and a rotor rotating in a predetermined angle range, and the driving lever is formed on the shutter blade. The first
A drive pin inserted into and engaged with a connection hole and a second connection hole formed in the diaphragm blade; a connection hole formed between a swing center and a precursor drive pin and connected to the output pin;
The shutter device with an aperture mechanism according to claim 2, comprising: 4. The first connection hole has a first play allowance in which the drive pin can move, and the second connection hole allows the drive pin to move and is larger than the first play allowance. The shutter device with a diaphragm mechanism according to claim 3, wherein the shutter device has a second allowance. 5. The holding means comprises a spring for exerting an urging force for holding the drive lever at a position corresponding to when the aperture blade is at the aperture position and when the shutter blade is at the predetermined position. The shutter device with an aperture mechanism according to any one of claims 1 to 4, wherein: 6. The apparatus according to claim 6, wherein said spring exerts a biasing force for holding said drive lever at a position corresponding to when said aperture blade is at said retracted position and said shutter blade is at said open position. A shutter device with an aperture mechanism according to claim 5. 7. The first stability in which the deformation energy is reduced when the drive lever is located at a position corresponding to when the aperture blade is at the aperture position and the shutter blade is at the predetermined position. And a second stable position where deformation energy is reduced when the drive lever is located at a position corresponding to when the diaphragm blade is at the retracted position and the shutter blade is at the open position, 7. A shutter device with a diaphragm mechanism according to claim 6, wherein: