JP3167805B2 - Shutter opening and closing 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 opening / closing device used for a still camera or the like, and more particularly to a shutter opening / closing device capable of selecting an opening diameter in accordance with an operation direction of a driving source.

[0002]

2. Description of the Related Art Conventionally, there is known a shutter opening / closing device having a drive source such as a motor or a rotary solenoid which can be operated in both forward and reverse directions, and which can select an opening diameter in accordance with the operation direction of the drive source. For example, Japanese Patent Application Laid-Open No. 4-116533 can be pointed out as a preferable example. In the example described in this publication, a large-diameter opening forming edge and a small-diameter opening forming edge are formed on both sides of the blade member, respectively, and the operating direction of the blade member is reversed in accordance with the operating direction of the drive source. The opening diameter can be appropriately selected depending on whether the opening forming edge is used or a small-diameter opening forming edge is used.

[0003]

However, according to such a method, it is necessary to form both a large-diameter opening forming edge and a small-diameter opening forming edge on both sides of a single blade member. There is a problem that the area becomes large and the entire shutter opening / closing device also becomes large.

[0004]

SUMMARY OF THE INVENTION The present invention has been made in view of such a problem, and each blade member has a single opening forming edge and is adapted to the operating direction of a drive source. The purpose of the present invention is to make it possible to set the aperture diameter in two steps while using a small-sized blade member by making it possible to switch the operation amount of the blade member. Is what you do.

[0005] In summary, the shutter opening / closing device of the present invention changes the output end from the initial position where the aperture is closed.
A drive source that selectively reciprocates in both forward and reverse directions,
One that is pivotally supported by another rocking axis and has one end opposite to the other
Change the opening diameter by rotating them almost simultaneously
An opening forming edge is formed, and a contact portion is formed at the other end.
In the initial position, the contact portions are
A pair of abutting members on the output end of the moving member from opposite directions
A blade member that engages with both of the pair of blade members.
Having two engagement portions, and the output end of the driving member
When one of the blade members is driven by pressing the contact portion
Is transmitted to the other blade member, and the other blade member
When the contact portion is pushed and driven, the force is
A connecting member for transmitting to one of the blade members, and the pair of blade members
Member for biasing the opening in the direction to close the aperture
And the output end is forward / reverse from the initial position.
Regardless of the reciprocating operation in any direction, the pair of blades
The material is reciprocated in the same direction. In particular, stopper means are provided for regulating the forward and backward operation limits of the output end of the drive source, and the stopper is provided at the output end of the drive source. in response to actuation limit, it is formed by the pair of wing members
Is or to allow regulating the opening diameter, allowed difference and stroke from the stroke and the initial position from the initial position of the output end of the driving source to the positive direction of the working limit to the reverse direction of the working limit, the drive from the initial position depending on the operating direction of the source, in which the opening diameter formed by the pair of wing members to be selected.

[0006]

According to the present invention, when the output end of the drive source is operated in any direction, the contact point of one of the blade members is engaged with the output end corresponding to the operation direction, and the blade member is actuated. Operates in the opening direction against the urging force of the connecting member. At this time, the connecting member engages the other blade member and also operates the other blade member in the opening direction. Since the opening position of the blade member is also restricted at the position where the operation limit of the output end is restricted by the stopper member, the opening diameter is selected according to the direction in which the output end of the driving member is operated. Become.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below in detail with reference to the drawings. FIG. 1 shows a closed state, in which a pair of blade members 1 and 2 having substantially the same shape are pivotally supported by swinging shafts 3 and 4 in a state where they are turned left and right. Are formed with opening forming edges 1a and 2a, respectively. At the other end of each of the blade members 1 and 2, contact points 1b and 2b are formed, respectively, and the output pins 5a of the motor 5 contact the contact points 1b and 2b.

Reference numeral 6 denotes a connecting lever. The connecting lever 6 is pivotally supported by a shaft 7 so as to be provided with a right-turning property by a spring 8 and formed on, for example, a base plate or a frame (not shown). The right rotation is regulated by the regulating member 9.

A pin 6a is provided on the back surface of the tip of the connecting lever 6.
The pin 6a is provided between the shafts 3 and 4 and the slots 1c and 2c formed in the blade members 1 and 2, respectively.
Is engaged. Therefore, when a right-turning force is applied to the blade member 1, a left-turning force is applied to the blade member 2 via the pin 6 a, and conversely, when a left-turning force is applied to the blade member 2, the blade member 1 is applied to the blade member 1. On the other hand, a right turning force is applied via the pin 6a.

Reference numerals 10a and 10b denote stopper members formed on, for example, a base plate and a frame (not shown). The stopper member 10a regulates the left rotation of the output pin 5a, and the stopper member 10b controls the right rotation of the output pin 5a. Regulations. The feature of the present embodiment is that the positions of the stopper members 10a and 10b are adjusted so that the stroke is different between when the output pin 5a turns left and right when the output pin 5a turns from the initial state shown in FIG. . Reference numeral 11 denotes an aperture formed on the shutter base plate. An isosceles triangle is formed when the center of the aperture 11 and the centers of the swing shafts 3 and 4 are connected.

Next, the operation of this embodiment will be described with reference to the above items and FIG. 2 and FIG. First, in an initial state, the motor 5 is in a non-excited state, and the connecting lever 6 is in a state where the left end thereof is in contact with the regulating member 9 by the right turning force applied from the spring 8. Pin 6 at the end of connecting lever 6
a engages with the slots 1c and 2c of the blade members 1 and 2 to give the blade member 1 a left-handed turning property and the blade member 2 a right-handed turning property. Stops at the positions where the contact points 1b and 2b are in contact with the output pin 5a of the motor 5, respectively. At this time, the aperture 11 is
2 closed.

In this state, when the motor 5 is energized and rotated counterclockwise until the output pin 5a comes into contact with the stopper member 10a, the contact point 1b is pushed by the output pin 5a and the blade member 1 Turn right. When the blade member 1 turns clockwise in this manner, the elongated hole 1c formed in the blade member 1 engages the pin 6a and turns the connecting lever 6 counterclockwise around the shaft 7 against the spring 8.

Since the pin 6a is also engaged with the elongated hole 2c formed in the blade member 2, the pin 6a rotates the blade member 2 counterclockwise about the shaft 4, so that the blade member 1,
2 are formed with apertures 1a and 2a.
1 is opened with a relatively large diameter. When the energization of the motor 5 is stopped, the pin 6a of the connecting lever 6 is
1c, the blade 8 is turned clockwise by the spring 8 while engaging the respective members c.
The aperture 11 is closed as shown in FIG.

Next, when the motor 5 is energized from the non-energized state shown in FIG. 1 and turned clockwise until the output pin 5a contacts the stopper member 10b, the blade member 2 is brought into contact with the output pin 5a.
To make a left-handed rotation about axis 3. When the blade member 2 rotates leftward in this manner, a long hole 2 formed in the blade member 2 is formed.
c is engaged with the pin 6a and against the spring 8
The connecting lever 6 is turned left around the shaft 7.

Since the pin 6a is also engaged with the elongated hole 1c formed in the blade member 1, the pin 6a rotates the blade member 1 clockwise about the shaft 3, so that the blade member 1,
2 are formed with apertures 1a and 2a.
1 is opened with a relatively small diameter. When the energization of the motor 5 is stopped, the pin 6a of the connecting lever 6 is
1c, the blade 8 is turned clockwise by the spring 8 while engaging the respective members c.
The aperture 11 is closed as shown in FIG.

Although an example in which a motor is used as a drive source has been described above, any other drive source can be used as long as the drive source can be operated in both directions. For example, a solenoid or the like can be used. . In the above description, the stopper members 10a and 10b are provided to restrict the operation limit of the motor 5, which is an example of the drive source. However, the arc angle of the motor and the operation limit of the solenoid are limited in advance. In such a case, the opening diameter can be selected according to the operation direction of the drive source without providing a stopper member.

[0017]

As described above, according to the present invention, the blade member is driven in the opening direction regardless of the direction in which the drive source operates, and the travel of the blade member corresponds to the operation direction of the drive source. Since the amount is determined, it is possible to set the opening diameter in multiple stages only by the single opening forming edge. Therefore, the blade member can be reduced in size, and the entire shutter opening / closing device can be reduced in size. In particular, claims 2 and 3
When the operating range of the drive source is restricted by the stopper member as shown in (1), the range of choice of the drive source is expanded, and a general-purpose drive source can be selected and used without specially designing the drive source. can do.

[Brief description of the drawings]

FIG. 1 is a plan view of a shutter opening / closing device according to an embodiment of the present invention in an initial state.

FIG. 2 is a plan view showing a state where the shutter opening / closing device shown in FIG. 1 is opened to a relatively large diameter.

FIG. 3 is a plan view showing a state where the shutter opening / closing device shown in FIG. 1 is opened to a relatively small diameter.

[Explanation of symbols]

 Reference Signs List 5 Motor 5a Output pin 1, 2 Blade member 1a, 2a Opening edge 1b, 2b Contact 1c, 2c Long hole 3, 4 Oscillating shaft 6 Connecting lever 6a Pin 8 Spring 10a, 10b Stopper member 11 Aperture

Claims (3)

(57) [Claims] 1. An initial position in which an aperture is closed.
Drive source that selectively reciprocates the output end in both forward and reverse directions
And each is pivotally supported by a different swing axis, and at one end both
By rotating at the same time in opposite directions,
An opening forming edge for changing is formed, and the other end is in contact
Are formed in the initial position.
Parts contact the output end of the driving member from opposite directions.
A pair of blade members and the pair of blade members
An output portion of the drive member having one engagement portion for engagement.
One blade member is pushed by the end to push the contact part and is driven
Is transmitted to the other blade member when the
When the root member is driven by pushing the contact portion,
A connecting member for transmitting a force to the one blade member;
Of the blade member in the direction to close the aperture
A spring member, wherein the output end is in the initial position.
The reciprocating operation in either direction from
The reciprocating operation of the blade members in the same direction is performed . 2. The shutter opening / closing device according to claim 1, further comprising: stopper means for restricting a forward operation limit and a reverse operation limit of an output end of the drive source, wherein the stopper is provided at an output end of the drive source. in response to actuation limit, depending on the pair of wing members
A shutter opening / closing device characterized in that the opening diameter formed is regulated. 3. The shutter opening / closing device according to claim 2, wherein a stroke from an initial position of the output end of the drive source to an operation limit in a forward direction is different from a stroke from an initial position to an operation limit in a reverse direction. depending on the operating direction of the driving source from the initial position, formed by the pair of wing members
A shutter opening / closing device, wherein an opening diameter to be selected can be selected.