JP2003177447A - Shutter for camera - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a shutter for a camera which can be applied to the different specification of the camera just by putting a spring put on the aperture regulating member of a shutter blade by reversing its energizing direction. <P>SOLUTION: The aperture regulating member 5 is energized to rotate counterclockwise by the spring 6, and one end of the spring 6 is brought into contact with a spring receiving part 1f so as to keep its initial position. When the shutter blades 3 and 4 are actuated in such a state, an aperture part 1a is totally opened. When the member 5 is rotated clockwise against the energizing force of the spring 6, the abutting part 3b of the blade 3 abuts on a regulating part 5d and the blade 3 is stopped in the midst of opening actuation. In the case of rotating the member 5 counterclockwise according to the specification of the camera, the abutting part 3c of the blade 3 abuts on the regulating part 5d and the blade 3 is stopped in the midst of opening actuation by putting the spring 6 so that the energizing force thereof may be reversed. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a plurality of shutter blades, which are relatively reciprocally rotated by driving means.
The present invention relates to a camera shutter that opens and closes an exposure opening from a substantially central portion.

[0002]

2. Description of the Related Art It is arranged near a taking lens and a circular exposure opening is opened from a substantially central portion when taking a picture.
A camera shutter that is closed toward a substantially central portion is generally called a lens shutter. In the shutter, a plurality of shutter blades rotatably attached to a main plate are different depending on driving means. There is one that is configured to relatively reciprocate in two directions. As such a lens shutter, an overwhelmingly large number of shutter blades are configured with two shutter blades, but some of them are also proposed with three or four shutter blades. Has
There is also one in which one shutter blade and two shutter blades are relatively rotated.

As a drive source for opening and closing the shutter blade, there is still a drive source using only a spring, but in recent years, in most cases, only a motor or both a motor and a spring is used. It has become. And
The shutter blade may be connected to an opening / closing member (opening / closing lever) that is reciprocally operated by a drive source, or may be directly connected to an output pin integrated with the rotor of the motor. The connection is performed by a fitting configuration of the pin and the long hole. Also, as a slightly different thing, two shutter blades are connected by a pin and an elongated hole fitting configuration, and the opening / closing member and the eccentric pin of the motor are
There is also one in which only one of the shutter blades is connected by a pin and an elongated hole fitting structure. The present invention relates to a camera shutter having these configurations.

By the way, many cameras provided with this type of lens shutter do not have diaphragm blades, and many shutter blades perform their functions.
For example, if the shutter blade closes the exposure opening completely and then closes it,
There is a shutter blade that is closed during the opening operation. Also, priority is given to focusing in correspondence with zooming and distance adjustment, and first, the stop position of the opening operation of the shutter blade is restricted to the position before the full opening of the exposure opening, and accordingly, the closing operation timing of the shutter blade starts. There are some that are controlled.

A conventional example in which the opening operation of the shutter blades can be stopped before the exposure opening is fully opened is described in Japanese Patent Laid-Open No. 2000-66267. In this conventional example, the opening regulating member to which the rotational force is applied in one direction by the spring has the regulating portion (regulating pin), and is rotated by the operating member against the biasing force of the spring, The restriction portion (restriction pin) is configured to face the operation locus of the shutter blade. Therefore, the shutter blade comes into contact with the regulation portion (regulation pin) during the opening operation and is stopped before the exposure opening is fully opened.

[0006]

By the way, as can be seen from the above-mentioned conventional example, the aperture regulating member is usually attached to the shutter base plate, so that it is manufactured as a shutter unit. On the other hand, the operation member is provided on the camera body side. Therefore, in the case of this conventional example, in order to be able to adapt to the movement of the operation member on the camera body side, the aperture regulating member is configured to be rotated counterclockwise against the biasing force of the spring. ing. However, depending on the specifications of the camera, the direction in which it is pushed by the operating member is different, and there is a case in which the opening regulating member is required to be rotated clockwise against the biasing force of the spring. However, in that case, the above-mentioned conventional example cannot meet such a request only by changing the biasing direction by changing the spring, so that the shutter unit must be newly designed and manufactured. There is a point.

The present invention has been made in order to solve such a problem, and its object is to rotatably attach to a shutter base plate and to open it against the biasing force of a spring. When rotated to the regulation position, the opening regulation member that can stop the opening operation of the shutter blades on the way can be rotated in either direction from the initial position simply by changing the way the spring is applied during production. Another object of the present invention is to provide a camera shutter capable of restricting the opening of the shutter blade.

[0008]

In order to achieve the above object, a camera shutter according to the present invention comprises a base plate having an exposure opening and a spring hooking part, each of which rotates relative to the base plate. A plurality of shutter blades that are mounted so that they can be reciprocally rotated relative to each other by driving means to open and close the exposure openings, and one of them has two abutting portions for opening regulation. Which is rotatably attached to the main plate, has a spring hooking portion, a regulating portion, and a pushed portion, and in which direction the pushed portion is rotated from the initial position during manufacturing. Even if it is selected, correspondingly the opening is made to face the restriction portion to a position where either one of the two contact portions can be brought into contact, and the opening operation of the shutter blade is stopped before the exposure opening portion is fully opened. The regulating member and one end of the opening regulating portion And the other end is hooked on the spring hook of the main plate, and when the opening regulating member is rotated from the initial position, the opening regulating member is returned to the initial position by its urging force. And a return spring to allow it.

Further, in the present invention, the base plate has a spring receiving portion, and one end of the return spring is
The extended portion extends from the spring hooking portion of the opening regulating member, and regardless of the direction in which the opening regulating member is rotated from the initial position, the extending portion has the spring support at the initial position of the opening regulating member. The opening regulating member may be configured to separate from the spring receiving portion when the opening regulating member is rotated from the initial position. In that case, the spring hooking portion of the opening regulating member may be provided. In order to separately divide one end of the return spring in correspondence with the direction in which the opening regulating member is rotated from the initial position, a linear groove for fitting one end of the return spring is separately formed. This is advantageous for stabilizing the initial position of the opening regulating member.

[0010]

BEST MODE FOR CARRYING OUT THE INVENTION An embodiment of the present invention will be described with reference to the examples shown in FIGS. 1 to 3 are for explaining the case where the embodiment is configured in the first mode, and FIGS. 4 to 6 are for describing the case where the embodiment is configured in the second mode. . 1 and 4 are plan views showing a closed state of the shutter, FIGS. 2 and 5 are plan views showing a fully opened state of the shutter, and FIGS. 3 and 6 show an opening regulation state of the shutter. It is the top view shown.

First, the structure of this embodiment will be described with reference to FIG. The shutter base plate 1 and the auxiliary base plate 2 are attached to each other by appropriate means to form a blade chamber therebetween. Then, these base plates 1 and 2 are arranged with the shutter base plate 1 facing the subject in a state of being incorporated in the camera. Further, the shutter base plate 1 and the auxiliary base plate 2 are formed with a circular opening in the substantially central portion thereof, but since they have the same diameter and are arranged concentrically, in FIG. Only the opening 1a of the shutter base plate 1 is shown. Needless to say, the opening 1a is also an exposure opening that regulates the maximum aperture for photographing.

The shutter base plate 1 is formed with two elongated holes 1b and 1c communicating with the blade chamber, and the surface on the object side is provided with a shaft 1d, a spring hook 1e and a spring receiver 1f. Further, the shutter base plate 1 has a shaft 1 on the surface on the blade chamber side.
g, 1h and stoppers 1i, 1j are provided. Two shutter blades 3 and 4 formed in the same shape are arranged in the blade chamber in consideration of manufacturing cost. Among them, the shutter blades 3 arranged on the shutter base plate 1 side are rotatably attached to a shaft 1g, and have a long hole 3
It has a and two contact portions 3b and 3c. The other shutter blade 4 is rotatably attached to the shaft 1h and has a long hole 4a.

An aperture regulating member 5 is rotatably attached to the shaft 1d of the shutter base plate 1. The opening regulating member 5 is configured as a lever having two arm portions 5a and 5b, one arm portion 5a is extended to the outside of the shutter base plate 1, and the other arm portion 5b is provided with one arm portion 5a. The spring hooking portion 5c is provided on the surface, and the regulating portion 5d is provided on the other surface. The spring hook portion 5c is formed with two linear grooves intersecting with each other in order to fit one end of a spring described later. The restriction portion 5d is formed in a pin shape, penetrates the elongated hole 1b, and extends into the blade chamber. Further, the opening regulating member 5 is formed with a tubular portion for fitting with the shaft 1d, and the spring 6 is wound around the tubular portion. Then, one end of the spring 6 has a spring hook portion 5c.
1, the extended tip is in a state of being hooked also on the right side of the spring receiving portion 1f, and the other end is hooked on the spring hooking portion 1e in FIG.

Although not shown, a motor is attached to the subject side of the shutter base plate 1. This motor may be a step motor, but in the present embodiment, a case of a motor called a moving magnet type motor described in the above publication will be described. This moving magnet type motor is a motor whose rotation direction is determined in accordance with the direction of current supplied to the coil of the stator, and which causes the rotor made of a permanent magnet to reciprocally rotate within a predetermined angle range. Usually, a pin integrated with the rotor is used as an output pin, and as described in the above publication, the shutter blade is driven via the opening / closing member, or the shutter blade is directly driven. is doing.
Therefore, the drive pin 7 shown in FIG. 1 may be an output pin of the motor or a pin provided on the opening / closing member. In any case, the drive pin 7 penetrates the elongated hole 1c, extends into the blade chamber, and is fitted into the elongated holes 3a and 4a of the shutter blades 3 and 4.

Next, the operation of this embodiment will be described, but it may be explained before that. 1 to 3 and the modes shown in FIGS. 4 to 6 have the same constituent members, but the attachment of the spring 6 to the opening restricting member 5 is the same. It means that they are assembled so that the directions of power are opposite. That is, in the embodiment shown in FIGS. 1 to 3, the spring 6 urges the opening regulating member 5 to rotate in the counterclockwise direction, whereas in FIGS. In this mode, the spring 6 urges the opening regulating member 5 to rotate clockwise. Therefore, first, the operation of the embodiment shown in FIGS. 1 to 3 will be described.

FIG. 1 shows the initial state of the shutter, that is, the closed state of the shutter. At this time, the drive pin 7 is given a force to move it to the upper left in FIG. 1 by a known means, but since the tip of the shutter blade 4 is in contact with the stopper 1i, this closed state can be stably obtained. Has been.
Further, the opening restricting member 5 is biased by the spring 6 so as to rotate counterclockwise, but since the tip of the spring 6 is in contact with the spring receiving portion 1f, some vibration may occur in this state. Even if added, it does not rotate clockwise or counterclockwise. For the aperture regulating member 5, the position shown in FIG. 1 is the initial position.

When the release button of the camera is pressed at the time of shooting, in response to the shooting conditions already described,
There are cases where the shutter blades 3 and 4 perform the closing operation after the opening 1a is fully opened, and cases where the shutter blades 3 are stopped before the opening 1a is fully opened and the closing operation is performed from the stop position.
Therefore, first, the case where the shutter blades 3 and 4 fully open the opening 1a will be described. In that case, the opening restricting member 5 remains at the initial position shown in FIG. First, when the drive pin 7 is actuated in the elongated hole 1c in the lower right direction in FIG. 1 by the rotation of a motor (not shown), the shutter blade 3 moves clockwise and the shutter blade 4 moves counterclockwise. , And at the same time, they are relatively rotated to open the opening 1a. Then, this opening operation is stopped after the shutter blade 4 comes into contact with the stopper 1j after the opening 1a is fully opened. The state is shown in FIG.

In the case of the present embodiment, in the state of FIG. 2, the shutter blade 3 is not in contact with the restriction portion 5d of the opening restriction member 5. However, if the operation member (not shown) on the camera body side is configured to firmly grip the arm portion 5a so that the aperture regulating member 5 does not rotate, the shutter blade 3 may be regulated by the regulating portion 5d. It is possible to stop the opening operation of the shutter blades 3 and 4 by bringing them into contact with. In that case, of course, the stopper 1j is unnecessary. When the fully opened state is obtained in this manner, the motor is rotated in the reverse direction immediately or after a predetermined time, and the drive pin 7 is operated to the upper left. Therefore, the shutter blades 3 and 4 are rotated in the opposite manner to the opening operation to close the opening 1a. Then, after closing the opening 1a, the shutter blade 4 is stopped by coming into contact with the stopper 1i, and immediately after that, the energization of the motor is cut off and the initial state of FIG. 1 is restored.

Next, a case will be described in which the shutter blades 3 and 4 can be stopped in the middle of the opening operation. In this case, first, before opening the shutter blades 3 and 4, the opening regulating member 5 has its arm portion 5a operated by an operating member on the camera body side, as shown by an arrow in FIG. ,
It is rotated clockwise against the biasing force of the spring 6. Therefore, one end of the spring 6 separates from the spring receiving portion 1f.
In that case, as can be seen from the description below, the larger the clockwise rotation angle of the aperture regulating member 5, the earlier the opening operation of the shutter blades 3 and 4 is stopped, and the aperture formed by them becomes smaller. Regulated. Therefore, the size of such an opening can be continuously or stepwise changed. In FIG. 3, the opening regulating member is positioned in this way.

After the opening regulating member 5 is positioned,
Current is supplied to a motor (not shown) in the same manner as described above. Therefore, the shutter blades 3 and 4 are simultaneously and relatively rotated by the drive pin 7 to start the opening operation. Then, the opening operation is stopped by the contact portion 3b of the shutter blade 3 coming into contact with the regulation portion 5d of the aperture regulation member 5. That state is the state shown in FIG. When the contact portion 3b of the shutter blade 3 comes into contact with the regulating portion 5d,
The force for further rotating the opening regulating member 5 in the clockwise direction does not act. Therefore, the operation member on the camera side for rotating the opening regulating member 5 to the position of FIG. 3 is not connected to the arm portion 5a, and may be configured as a member that only pushes the arm portion 5a in the arrow direction. Immediately or after a predetermined time after the state of FIG.
As described above, the shutter blades 3 and 4 have openings 1a.
Is closed, and the shutter blade 4 comes into contact with the stopper 1i and stops. When the motor is de-energized, the state of FIG. 1 is restored.

Next, the case of being assembled in a mode different from the above will be described with reference to FIGS. Figure 1 above
In the case of the embodiment shown in FIG. 3, when performing the aperture regulation, the aperture regulation member 5 was rotated clockwise from the initial position. This is because the camera-side operating member (not shown) was configured to operate in the direction of the arrow in FIG. However, depending on the design of the camera, the operation member on the camera side may be configured to operate in the direction opposite to the arrow direction in FIG. Therefore, in the present embodiment, if the spring 6 is attached so that the biasing directions are opposite, it is possible to meet such needs on the camera side. That is, in this mode, one end of the spring 6 is fitted into the groove on the spring hooking portion 5c different from that in the above mode, and in the state of FIG. 4, its tip is on the left side of the spring receiving portion 1f. It has been hung,
The other end is hooked on the spring hook 1e.

Therefore, the operation of this mode will be described below. However, since the description is the same as the above-described mode or the inside out, the description will be simplified. FIG. 4 shows a closed state of the shutter. At this time, the opening regulating member 5 is biased by the spring 6 so as to rotate clockwise, but since the tip of the spring 6 is in contact with the spring receiving portion 1f, this initial position is stable. Has been obtained.
Therefore, first, the shutter blades 3,
4, the case where the opening 1a is fully opened will be described.

In that case, the opening regulating member 5 is not rotated from this initial position. Further, the opening operation of the shutter blades 3 and 4 is performed in exactly the same manner as in the case of the above aspect. Then, after fully opening the opening 1a,
FIG. 5 shows a state in which the shutter blade 4 comes into contact with the stopper 1j and stops. At this time, since the aperture restricting member 5 is at the initial position, the shutter blade 3 is not in contact with the restricting portion 5d of the aperture restricting member 5 as in the case of the above mode. When the fully opened state is obtained in this way, the motor is rotated in the reverse direction immediately or after a predetermined time, so that the shutter blades 3 and 4 are rotated in the opposite direction to the opening operation, and the opening 1 is opened.
After the closing of a, the shutter blade 4 is stopped by coming into contact with the stopper 1i, and immediately after that, the energization of the motor is cut off and the state of FIG. 4 is restored.

Next, a case will be described in which the shutter blades 3 and 4 can be stopped in the middle of the opening operation. In that case, first, before opening the shutter blades 3 and 4, the opening regulating member 5 has its arm portion 5a operated by an operation member on the camera body side, as shown by an arrow in FIG. ,
It is rotated counterclockwise against the biasing force of the spring 6.
Therefore, one end of the spring 6 separates from the spring receiving portion 1f. After the opening regulating member 5 is positioned in this manner, the opening operation of the shutter blades 3 and 4 is performed in the same manner as described above.

The opening operation is performed by the shutter blade 3
The abutting portion 3c comes into contact with the regulating portion 5d of the opening regulating member 5 and stops. The state is shown in Fig. 6 (Because the drawing becomes difficult to see,
Since the contact portion 3c is not designated by a reference numeral, its position is shown in FIGS. ) Is the state shown. When the contact portion 3c of the shutter blade 3 comes into contact with the regulation portion 5d, the force for further rotating the aperture regulation member 5 in the counterclockwise direction does not act. Therefore, the operation member on the camera side for rotating the opening regulating member 5 to the position of FIG. 6 is not connected to the arm portion 5a, and may be configured as a member that only pushes the arm portion 5a in the arrow direction. Immediately after the state of FIG. 6 is obtained in this way or when the motor is rotated in reverse for a predetermined time,
The shutter blades 3 and 4 close the opening 1a, and the shutter blade 4 comes into contact with the stopper 1i and stops. Then, the power supply to the motor is cut off and the state shown in FIG. 4 is restored.

In the embodiment, in order to surely obtain the initial position of the opening regulating member 5, the shutter base plate 1 is provided with the spring receiving portion 1f, and one end of the spring 6 is extended so as to contact with it. However, if the operation member on the camera side is always in contact with the arm portion 5a of the aperture regulation member 5 and the aperture regulation member 5 can be reliably positioned at the initial position, such a configuration is adopted. You don't have to. Also,
In the embodiment, one end of the spring 6 is fitted in the linear groove formed in the spring hook portion 5c, which is
When the spring 6 is in contact with the spring receiving portion 1f,
This is to prevent the opening restriction member 5 from rotating. However, if the operation member on the camera side firmly grips the arm portion 5a of the opening regulating member 5 and surely positions the opening regulating member 5 at the initial position, it is necessary to particularly adopt such a configuration. However, there is no problem even if it is hung on the circumferential surface of the spring hook portion 5c in the same manner as how the other end is hooked on the spring hook portion 1e. Further, the example
Although the description has been made on the assumption that a moving magnet type motor is used, as already described, the drive source may be another motor or a spring, or a combination of a motor and a spring may be used. It doesn't matter.

[0027]

As described above, in the camera shutter of the present invention, when a plurality of shutter blades are simultaneously actuated in two opposite directions to open and close the circular exposure opening and operate the aperture regulating member. In the lens shutter, the opening operation of the shutter blade can be stopped before the exposure opening is fully opened.However, even if the operation direction of the operation member on the camera body side is different, another shutter is not required, The spring has a feature that it can be applied only by changing the biasing direction of the spring to be applied to the opening regulating member so that the biasing directions are opposite.

[Brief description of drawings]

FIG. 1 is a plan view showing a closed state of a shutter when an embodiment is constructed in a first mode.

FIG. 2 is a plan view showing a fully opened state of the shutter when the embodiment is configured in the first mode.

FIG. 3 is a plan view showing an opening regulation state of a shutter when the embodiment is configured in the first mode.

FIG. 4 is a plan view showing a closed state of the shutter when the embodiment is configured in the second mode.

FIG. 5 is a plan view showing a fully open state of the shutter when the embodiment is configured in the second mode.

FIG. 6 is a plan view showing an aperture regulation state of a shutter when the embodiment is configured in the second mode.

[Explanation of symbols]

1 Shutter base plate 1a opening 1b, 1c, 3a, 4a long holes 1d, 1g, 1h axis 1f Spring receiving part 1e, 5c Spring hook 1i, 1j stopper 2 auxiliary ground plane 3,4 shutter blades 3b, 3c contact part 5 Opening control member 5a, 5b arm 6 springs 7 drive pin

Claims (3)

[Claims] 1. A base plate having an exposure opening and a spring hook portion, and each of the base plate rotatably attached to the base plate and reciprocally rotated by a drive means. And a plurality of shutter blades, one of which has two abutting portions for opening regulation,
It is rotatably attached to the main plate, has a spring hooking portion, a regulating portion, and a pushed portion, and which direction the rotation direction of the pushed portion is rotated from the initial position is selected at the time of manufacture. In the case of opening, the opening restricting member correspondingly faces the position where either one of the two contacting parts can be brought into contact with the opening restricting member to stop the opening operation of the shutter blade before the exposure opening is fully opened. And one end is hooked on the spring hooking part of the opening restricting member and the other end is hooked on the spring hooking part of the main plate. When the opening restricting member is rotated from the initial position, it is tensioned and when it returns, the biasing force causes A shutter for a camera, comprising: a return spring that returns the aperture regulating member to an initial position. 2. The base plate has a spring receiving portion,
Further, one end of the return spring has an extending portion extending from a spring hooking portion of the opening regulating member, and the extending portion is configured to open the opening regardless of a direction in which the opening regulating member is rotated from an initial position. The spring contact portion contacts the spring receiving portion at an initial position, and is configured to separate from the spring receiving portion when the opening restricting member is rotated from the initial position. The shutter for the camera according to [1]. 3. The spring retaining portion of the opening regulating member is fitted with one end of the returning spring in order to hook one end of the returning spring in correspondence with a direction in which the opening regulating member is rotated from an initial position. The camera shutter according to claim 2, wherein the linear grooves are formed separately.