JP2562988Y2 - Shutter device - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a shutter device used in a still camera and the like, and more particularly to a shutter device in which a closing blade also serves as an aperture device.

[0002]

2. Description of the Related Art Still cameras, which have been rapidly spreading in recent years, are equipped with various functions. As such a function, for example, a multi-program such as an aperture priority mode and a program mode is known. In order to cope with the multi-program, recent still cameras tend to include an aperture device that is independent of a shutter device.

[0003]

However, a still camera equipped with an aperture device independent of the shutter device as described above has a problem that the production cost is extremely high. Further, in the conventional shutter device, problems such as torque of the motor itself when opening and closing the shutter blades by a motor such as a step motor, inertia, and the like, and a spring having a strong urging force are used when the shutter blades are opened and closed by the urging force of the spring. It has been difficult to increase the shutter speed due to problems in the mechanical configuration, such as the inability to perform such operations. For this reason,
In a still camera equipped with such a shutter device, when the aperture set at the time of shooting a bright subject is close to open,
There has been a problem that a shutter speed sufficient for exposure control cannot be obtained, and in the aperture priority mode, the exposure interlocking range when the aperture value is open is extremely narrow.

The present invention has been made in order to solve the above-mentioned problems, and has a structure in which a shutter speed higher than that of a conventional motor can be obtained even when a normal motor is used, and which also serves as an aperture device. It is an object of the present invention to provide a shutter device that can be controlled at a low cost.

[0005]

SUMMARY OF THE INVENTION A shutter device according to the present invention includes a drive ring rotatably disposed around an opening, and an opening locked by the drive ring in a state where a biasing force is applied in an opening direction. A shutter device comprising: a blade; a closing blade provided with a biasing force in an opening direction; and a closing member locked to the drive ring in a state where the biasing force is provided in a direction to close the closing blade. The drive ring operates the opening blade in the open state in the closing direction against the urging force, and operates the closing member that locks the closing blade in the closed state against the urging force. A cam portion for releasing the biasing to the closing blades, and an opening blade locked in the closed state and a closing member locked in the releasing state for closing the closing blades in the respective biasing directions. And a step is formed, and Flip in which the aperture setting member to set the aperture to limit the amount of opening of the vane is provided.

Further, in the shutter device of the present invention, in the above-mentioned shutter device, by rotating the drive ring in a direction opposite to the direction in which the shutter is opened and closed, the opening amount of the closing blade in the opened state due to the urging force in the opening direction is reduced. The setting of the aperture by the aperture setting member with restriction is also included.

The shutter device according to the present invention is such that, in the shutter device described above, the drive ring is rotated in a direction for opening and closing the shutter to release the aperture set before the aperture setting by the aperture setting member. Is also included.

[0008]

In the shutter device of the present invention, in the initial state (the state before the release), the opening blade for performing the shutter opening step is closed and locked to the drive ring in a state where the urging force is applied in the opening direction, and the shutter is closed. The closing blade for performing the process is opened by the closing member, and the closing member is locked to the drive ring in a state where a biasing force is applied in the closing direction.

When the shutter is released, the driving ring is first rotated by a motor or the like in the direction opposite to the direction in which the shutter is opened and closed, so that the closing blade is closed to a predetermined aperture position, and the operation in the opening direction is performed at that position. Restrict and set the aperture. After doing this, the drive ring is rotated in the direction for opening and closing the shutter, and the opening of the opening blade is released at the cut portion of the drive ring to perform the shutter opening operation.
After the shutter opening is fully opened and a time corresponding to an appropriate exposure value (EV) has elapsed, the locking of the closing member is released by further rotating the drive ring in the same direction, and the closing blade is pressed against its urging force. To operate in the closing direction to close the shutter opening.

When the drive ring is further rotated in the same direction after the release is completed, the opening blade returns to the closed state against the urging force by the cam portion of the drive ring, and the closing member is attached to the closed blade. By returning to the position where the force is released, the closing blade is opened by the urging force and returns to the above-described aperture position. By further rotating the drive ring in the same direction, the restriction of the closing blade by the aperture setting member is released, whereby the closing blade is fully opened to return to the initial state.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the shutter device according to the present invention will be described below with reference to FIGS.

As shown in FIG. 1, the shutter device of this embodiment has a drive ring 1 disposed around a shutter opening O, a shutter opening member 2 (see FIG. 3) for performing a shutter opening step, and a shutter closing. A shutter closing member 3 which performs a process and also serves as an aperture blade;
And an aperture setting member 20 for setting the aperture by the aperture.

As shown in FIG. 1, the drive ring 1 has a ring shape, an enlarged diameter portion 7 is formed in substantially half of an outer edge portion 4, and a shutter opening member 2 and a shutter closing member 3 are formed.
The ring portion 5 is formed concentrically around the shutter opening O on the surface opposite to the side where is located, and the gear portion 6 is formed on the outer periphery thereof.

As shown in FIG. 3, the shutter opening member 2 includes an opening blade 2b rotatably attached to a fixed shaft 2a and an opening blade 2d rotatably attached to a fixed shaft 2c. A pin 2e for connecting the opening blade 2b and the opening blade 2d with a pin, and a hook 2f engaged with the pin 2e and rotatably attached to the fixed shaft 2a, and having a hook 2f on the opposite side to the pin 2e. Open / close lever 2g
And a spring 2 whose one end is locked to a hook 2f of the opening / closing lever 2g to urge the opening blades 2b and 2d in an opening direction.
h. In FIG. 3, reference numeral 13 denotes a trigger switch. In a state before the shutter is opened in FIG.
3a is locked by the pin 2e of the shutter opening member 2, and the trigger switch 13 is turned off.

As shown in FIG. 1, the shutter closing member 3 includes a closing blade 3b rotatably mounted on a fixed shaft 3a, a closing blade 3d rotatably mounted on a fixed shaft 3c, and A pin 3e inserted into the guide hole 3p of the closing blade 3d to pivotally support the closing blade 3d and the closing blade 3b so as to swing freely, and is engaged with the pin 3e and rotatably attached to the fixed shaft 3a. An opening / closing lever 3g having a projection 3i and a hook 3f located between the fixed shaft 3a and the pin 3e, and a hook 3f of the opening / closing lever 3g.
A spring 3h whose one end is locked to urge the closing blades 3b and 3d in the opening direction, and is rotatably attached to the fixed shaft 3a and locked to the enlarged diameter portion 7 of the drive ring 1. A closing member 3m having a pin 3k, a contact piece 3j abutting on a projection 3i of the opening / closing lever 3g, and a hook 31;
A spring 3n is fixed at one end to a hook 3l of the closing member 3m and biases the closing member 3m in a direction to contact the projection 3i of the opening / closing lever 3g. The spring 3n attached to the closing member 3m has a higher elastic force than the spring 3h attached to the opening / closing lever 3g. The closing member 3m closes the opening / closing lever 3g while charging the spring 3h, and closes the blades 3b and 3d. It can be integrally rotated in the direction.

As shown in FIG. 1, the aperture setting member 20 is rotatably mounted on a fixed shaft 21a, and has a contact surface 21d which contacts a pin 3e of the opening / closing lever 3g, and a plurality of claws 21b. , Rotatably attached to the shaft 27a,
An aperture setting lever 21 having a lever 27 that is elastically engaged with and released from the projection 21c; a spring 22 for urging the aperture setting lever 21 in a direction to separate the aperture setting lever 21 from the pin 3e; It has a locking portion 24b rotatably attached to the fixed shaft 24a and locked by an arbitrary claw 21b of the aperture setting lever 21 to restrict the rotation of the aperture setting lever 21 in the biasing direction by the spring 22. Lock lever 24
And a spring 25 for urging the locking lever 24 in a direction in which the locking portion 24b of the locking lever 24 is locked to the claw 21b of the aperture setting lever 21.

At the upper left end of the enlarged diameter portion 7 in FIG. 1, the pin 2e and the pin portion 3k engaged with the enlarged diameter portion 7 are unlocked, and the pin 2e and the pin portion 3k are disengaged from the spring 2h. A step 8 is formed to be locked to the outer edge 4 by the biasing force of the spring 3n. In addition, a cam portion 9 for returning an open blade for pushing up the pin 2e against the urging force of the spring 2h and returning to the enlarged diameter portion 7 is formed at the lower right end of the enlarged diameter portion 7 in FIG. And the cam portion 9 of the enlarged diameter portion 7
As shown in the cross-sectional view of FIG. 9, the peripheral portion is formed so as to be approximately half the thickness of the other portion, biased on the surface opposite to the blades (opening blades 2b, 2d and closing blades 3b, 3d). An outer edge portion 4 that is not expanded is extended on the blade side of the thin-walled enlarged portion 7. As shown in FIG. A closed blade return cam portion 10 is formed to push up against the urging force and return to the enlarged diameter portion 7.

Also, on the surface of the enlarged diameter portion 7 opposite to the blade, a pin for contacting the lever 27 of the aperture setting member 20 and rotating the aperture setting lever 21 against the urging force of the spring 22 is provided. A portion 30 is formed, and a pin portion 31 is formed on the blade-side surface of the enlarged diameter portion 7 to abut the locking lever 24 and rotate the locking lever 24 against the urging force of the spring 25. Have been.

As shown in FIG. 1, a transmission gear 11 is meshed with the gear portion 6, a pinion gear 12 is meshed with the transmission gear 11, and the pinion gear 1
Reference numeral 2 is attached to an output shaft of a motor (not shown) (for example, a step motor).

Next, the operation of the shutter device will be described with reference to FIGS.

In the initial state (state before release),
As shown in FIG. 1, the shutter opening member 2 closes the opening blades 2b and 2d to close the shutter opening O as shown in FIG. 3, and the pin 2e is applied with a biasing force in the opening direction by a spring 2h. Are locked to the enlarged diameter portion 7 of the drive ring 1, and the shutter closing member 3 is configured such that the closing member 3m includes a spring 3n.
The pin portion 3k is locked by the enlarged diameter portion 7 of the drive ring 1 in a state where the biasing force is applied by the above, the biasing of the opening / closing lever 3g by the closing member 3m is released, and the closing blades 3b, 3d are moved by the spring 3h Open due to bias. At the time of release, first, the output shaft of a motor (not shown) is driven to rotate, so that the drive ring 1 is driven via the pinion gear 12 and the transmission gear 11 shown in FIG.
Is rotated a predetermined amount counterclockwise in the figure (in the direction opposite to the shutter opening and closing direction). In this case, the pin portion 30 of the drive ring 1 pushes the lever 27 to rotate the aperture setting lever 21 clockwise, whereby the contact surface 21d of the aperture setting lever 21 pushes the pin 3e to open the opening / closing lever 3g. Rotate a predetermined amount counterclockwise against the urging force of 3h. And
As shown in FIG. 2, when the closing blades 3b and 3d are closed to a predetermined aperture position, the predetermined claw 2 of the aperture setting lever 21 is moved.
The locking portion 24b of the locking lever 24 is locked to 1b, whereby the aperture is determined. Next, by rotating the output shaft of the motor in a direction opposite to that described above, the drive ring 1 shown in FIG. 2 is rotated clockwise (in the shutter opening / closing direction) in FIG. The stepped portion 8 releases the locking of the opening / closing lever 2g of the shutter opening member 2 locked to the shutter opening member 2. With this configuration, the opening / closing lever 2f is moved by the biasing force of the spring 2h to the fixed shaft 2
a, the pin 2e moves away from the lever 13a of the trigger switch 13 and the trigger switch 1
3 is turned ON, an electric time control circuit (not shown) starts electric calculation, the motor stops, and the rotation of the drive ring 1 stops. Then, with the rotation of the opening / closing lever 2f, the opening blade 2b rotates clockwise about the fixed shaft 2a, and the opening blade 2d rotates counterclockwise about the fixed shaft 2c, as shown in FIG. Fully open the shutter opening O as shown,
It stops when the pin 2e contacts the outer edge 4 of the drive ring 1. At this time, the closing blade 3 of the shutter closing member 3
Since b and 3d are at the aperture position in FIG. 2 as set in the above, the aperture is limited even when the opening blades 2b and 2d are fully opened. Then, after a time corresponding to an appropriate exposure value (EV) has elapsed since the trigger switch 13 was turned on, the drive ring 1 shown in FIG.
Closing member 3 of shutter closing member 3 locked to enlarged diameter portion 8
The locking of the pin portion 3k of m is released by the step portion 8 of the drive ring 1. Then, the closing member 3m rotates counterclockwise around the fixed shaft 3a by the urging force of the spring 3h, and the contact portion 3j of the closing member 3m comes into contact with the projection 3i of the opening / closing lever 3g. 3i is pushed and open / close lever 3g
Rotates counterclockwise while charging the spring 3h, whereby the closing blade 3b rotates counterclockwise about the fixed shaft 3a, and the closing blade 3d rotates clockwise about the fixed shaft 3c. To close the shutter opening O as shown in FIG.
When the pin 3k of the closing member 3m comes into contact with the outer edge 4 of the drive ring 1, it stops and the exposure is completed. After the release is completed in this manner, the drive ring 1 shown in FIG. 5 further rotates clockwise, whereby the pin 2e locked on the outer edge 4 is pressed by the cam 9 to the urging force of the spring 2h. The opening / closing lever 2g is rotated counterclockwise, and the opening blades 2b and 2d close the shutter opening O as shown in FIG.
Is locked to the enlarged diameter portion 7. Next, the drive ring 1 shown in FIG. 6 further rotates clockwise, whereby the pin 3k of the closing member 3m locked to the outer edge 4 is expanded by the cam 10 against the urging force of the spring 3n. The closing member 3m shown in FIG. 6 is rotated clockwise by being pushed up by the diameter portion 7 to be locked to the opening / closing lever 3g by the contact piece 3j as shown in FIG. 7, the opening / closing lever 3g is rotated clockwise by the urging force of the spring 3h, and when the closing blades 3b, 3d are opened to the throttle position in FIG. 2, the opening / closing lever 3g is released. Pin 3e comes into contact with the contact surface 21d of the aperture setting lever 21 and stops. Further, the drive ring 1 rotates clockwise, and as shown in FIG. 8, when the pin portion 31 rotates the locking lever 24 counterclockwise (in the direction of the arrow in the drawing), the aperture setting lever 2 is rotated.
1 is released, whereby the aperture setting lever 21 is released.
Is rotated counterclockwise by the spring 22 to release the locking of the opening / closing lever 3g to the pin 3e.
h, the shutter blades 3b and 3d rotate clockwise to fully open the shutter opening O. Then, the drive ring 1 further rotates clockwise by a predetermined amount, and returns to the initial state of FIG.

In the shutter device of this embodiment, one cycle of the shutter opening / closing operation is completed by one rotation of the drive ring 1. It is also possible to provide a shutter opening / closing operation in one rotation of the drive ring 1 for two or more cycles.

Further, in the shutter device of this embodiment, the cam portion 9 for returning the open blade and the cam portion 10 for returning the closed blade are driven by partially reducing the thickness of the enlarged diameter portion 7 to approximately half. Although the position is shifted in the driving direction of the ring 1, the cam portion 9 is used for both the open blade return and the closed blade return cam without changing the thickness of the enlarged diameter portion 7. Can also.

[0024]

According to the shutter device of the present invention, the shutter speed can be increased by increasing the urging force of the open and closed blades, and the effective length of the cam portion of the drive ring can be increased to increase each blade. Thus, the load on the motor when the urging force is restored can be suppressed to a small value, so that even if a conventionally used motor is used, the speed of the shutter can be extremely easily increased. For this reason, even when the aperture is set to be more open when shooting a bright subject, a shutter speed sufficient for exposure control can be obtained, and the aperture at the same exposure value (EV) can be set to be more open than before. Therefore, the exposure interlocking range in the aperture value open state when used in the aperture priority mode can be expanded. Also, by opening the aperture when shooting a bright subject, it is possible to reduce the depth of the subject backwards,
Thereby, a blurring effect, which is an advantage in using a bright lens, can be obtained.

In addition, in this shutter device, since the aperture is set by adjusting the opening of the closing blade in advance, there is no need to provide an independent aperture device, and therefore, the production cost can be reduced. .

[Brief description of the drawings]

FIG. 1 is a partially broken plan view showing an initial state (a state before release) of a shutter device according to an embodiment of the present invention.

FIG. 2 is a partially cutaway plan view showing a state where an aperture of the shutter device according to the embodiment of the present invention is set.

FIG. 3 is a plan view showing the shutter opening member before the shutter opening operation of the shutter device according to the embodiment of the present invention;

FIG. 4 is a plan view showing the shutter opening member after the shutter opening operation of the shutter device according to the embodiment of the present invention;

FIG. 5 is a plan view showing a shutter closing member of the shutter device according to the embodiment of the present invention in a shutter closed state (release completed state).

FIG. 6 is a plan view illustrating a return process of the shutter opening member of the shutter device according to the embodiment of the present invention;

FIG. 7 is a plan view illustrating a returning process of the shutter closing member of the shutter device according to the embodiment of the present invention;

FIG. 8 is a plan view showing a process of releasing the aperture of the shutter device according to the embodiment of the present invention;

FIG. 9 is a sectional view taken along line AA of FIG. 1;

[Explanation of symbols]

 O Shutter opening 1 Drive ring 2 Shutter opening member 2a Fixed shaft 2b Open blade 2c Fixed shaft 2d Open blade 2e Pin 2f Hook 2g Open / close lever 2h Spring 3 Shutter closing member 3a Fixed shaft 3b Close blade 3c Fixed shaft 3d Close blade 3e Pin 3f Hook 3g Open / close lever 3h Spring 3i Projection 3j Contact piece 3k Pin part 3l Hook 3m Closing member 3n Spring 3p Guide hole 4 Outer edge part 5 Ring part 6 Gear part 7 Large diameter part 8 Step part 9 Opening blade return cam part 10 Closed blade return cam portion 11 Transmission gear 12 Pinion gear 13 Trigger switch 13a Lever 20 Aperture setting member 21 Aperture setting lever 21a Fixed shaft 21b Claw 21c Convex portion 21d Contact surface 22 Spring 24 Lock lever 24a Fixed shaft 24b Lock portion 25 spring 27 lever 27a shaft 0 pin 31 pin portion

Claims (3)

(57) [Scope of request for utility model registration] A drive ring rotatably arranged about an opening, an opening blade locked to the drive ring in a state where an urging force is applied in an opening direction, and an urging force applied in an opening direction. And a closing member that is locked to the drive ring in a state where a biasing force is applied in a direction in which the closing blade is closed. A cam for operating the blade in the closing direction against the urging force, and releasing the urging to the closing blade by operating the closing member holding the closing blade in the closed state against the urging force. And a step portion for operating the closing blade locked in a state where the opening blade and the closing blade locked in the closed state are released from the bias in the respective biasing directions, and the closing is performed. Set the aperture by limiting the opening of the blade A shutter device aperture setting member is provided. 2. The shutter device according to claim 1, wherein the driving ring is rotated in a direction opposite to a direction in which the shutter is opened and closed to limit an opening amount of the closing blade in an open state due to an urging force in an opening direction. A shutter device, wherein an aperture is set by an aperture setting member. 3. A shutter device according to claim 1, wherein the drive ring is rotated in a direction for opening and closing the shutter to release the aperture set before the aperture setting by the aperture setting member. Shutter device.