JP2003344898A - Focal plane shutter for camera - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a focal plane shutter for a camera having improved general applicability with which a comparatively large and slender motor as a driving source for a set member is assembled. <P>SOLUTION: Shutter blades are arranged between a shutter base plate 1 and an auxiliary base plate 2. The motor 24 is arranged in the side area of the aperture part 1a on the shutter base plate 1, and a mechanism of performing a shutter blade opening/closing operation is arranged on the auxiliary base plate 2 placed back to back with the shutter base plate 1. A can disk 26 fixed to the output shaft of the motor 24 and a mediating member 27 rotatably attached to a shaft 25a are arranged in a box 25 positioned under the motor 24. A charging member 4 connected to the set member of the mechanism 3 is attached to the shaft 2b of the auxiliary base plate 2 in the lower position of the mechanism 3. By having such the compact constitution, the rotation of the motor 24 is appropriately transmitted to the set member. <P>COPYRIGHT: (C)2004,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a focal plane shutter for a camera in which a shutter blade is actuated by an urging force of a drive spring at the time of photographing, and the urging force of the drive spring is charged by a motor at the time of setting.

[0002]

2. Description of the Related Art Some focal plane shutters for cameras include one having two shutter blades called a leading blade and a trailing blade, and one having only one shutter blade. The former is used in both silver halide cameras and digital still cameras, and the latter is used only in digital still cameras. The shutter blades of any type have the same basic configuration, and two arms, one end of which is pivotally attached to the shutter base plate at one side position of the exposure opening, and the two arms are pivotally connected to them. One or more blades are supported, and each blade is operated in the vertical direction of the camera to open and close the exposure opening. And
Among them, the one that has two shutter blades has two blade chambers that are separated by an intermediate plate between the two base plates in order to prevent them from interfering with each other in operation. Ordinarily, however, if it is configured as described in, for example, Japanese Patent Application Laid-Open No. 11-326992, it is possible to omit the intermediate plate as in the case of one shutter blade. .

Further, in the case of these focal plane shutters, as described above, the arm of the shutter blade may be pivotally attached to one side position of the exposure opening.
The shutter blade opening / closing mechanism is arranged at the same lateral position. And, in the opening and closing operation mechanism, during the exposure operation, the drive member that operates the shutter blades by the urging force of the drive spring, the electromagnet provided to control the operation start time, and the set operation, A set member that operates the drive member against the biasing force of the drive spring is included, but in the case of a focal plane shutter having two shutter blades, two drive members and two electromagnets are provided. On the other hand, as in the case of the focal plane shutter having one shutter blade, only one set member is provided, and both drive members are operated at slightly different timings during set operation. Is normal. The setting member is adapted to be operated by the driving force of the motor at least during the setting operation.

By the way, in the case of a focal plane shutter in which one or two drive members are operated against the biasing force of the drive spring, the set member that operates by using the motor as the drive source during the set operation is conventionally used. In general, the motor is not attached to the shutter unit side but is attached to the camera body side. Therefore, the transmission mechanism on the camera body side becomes complicated, and when the shutter unit is assembled, it must be accurately connected to the above-mentioned set member, which is advantageous in terms of compactness and cost. I couldn't say.
However, depending on the camera, it may not be necessary to share the motor for driving the diaphragm mechanism and the mirror mechanism, and even if it is shared, the motor should be attached to the shutter unit. There may be no problem. Therefore, in those cases, it is preferable to attach the motor to the shutter unit side.
Several proposals have been made in which the motor is directly attached to the shutter unit.

[0005]

However, if the motor is extremely small, it can be assembled in the shutter unit with almost no restrictions in terms of arrangement.
Such a motor is expensive and very difficult to adopt in a normal camera. Therefore, at present, it is unavoidable to adopt a relatively large and elongated motor which is advantageous in terms of cost. Recently, it has been required to employ a high-torque high-torque motor in order to enable continuous shooting in small increments, but a relatively large motor must be employed to meet that demand. I don't get. However, in order to assemble such a large motor in the shutter unit, the structure is naturally restricted.

That is, when designing the shutter unit, it is needless to say that the configuration is advantageous in terms of function and cost, but in addition to that, the design of the camera body side is too much. It is necessary to give consideration to obtain a large degree of freedom without giving restrictions. To this end, it is necessary to make the shutter unit itself excellent in compactness so as to be compatible with various cameras having different designs. The other is that the shutter unit itself needs to be configured in consideration of the weight balance design of the camera. However, it is not easy to satisfy them. Therefore, in order to make it easier to understand, a specific description will be given.

First, when the motor having a relatively large and elongated shape as described above is attached to the shutter unit, the rotation axis of the rotor is attached in parallel with the optical axis.
This is a problem from the viewpoint of making the shutter unit compact. That is, the design of the internal configuration and the external design on the front side (lens side) of the camera body is greatly restricted. Therefore, when installing the motor as described above, the rotation axis of the rotor should be
Although it is preferable to attach it to the peripheral area of the exposure opening orthogonally to the optical axis, it is not preferable to attach it to the upper area or the lower area of the exposure opening from the viewpoint of design because it increases the vertical size of the camera. If they are arranged, it will limit the structure of the finder optical system including the mirrors.

By the way, as described above, this motor is
Since it is for driving the setting member during the setting operation, it may be considered to be attached at a position near the setting member. However, in the side area of the exposure opening to which the set member is attached, in addition to the set member, many members that constitute the opening / closing operation mechanism are attached to the shutter base plate, and thus are attached in the vicinity of the set member. In this case, at a position farther from the exposure opening than the opening / closing mechanism, the length direction of the rotation axis is set in the vertical direction of the camera (that is,
The shutter blade will be installed in the operating direction). However, when mounted in such a position, the weight of the motor is approximately the same as or heavier than the opening / closing mechanism, and the heavy motor, including the reduction gear mechanism, is placed at a position far from the optical axis. Therefore, it cannot be said that the structure of the shutter unit considers the weight balance in the camera, and the weight balance design on the camera body side is affected.

The present invention has been made in order to solve such a problem, and an object thereof is to expose a relatively large and elongated motor which is a driving source of a setting member during a setting operation. In the side area of the opening and as close as possible to the exposure opening, the length of the rotating shaft is attached so as to match the operating direction of the shutter blades. It is an object of the present invention to provide a versatile focal-plane shutter for a camera with less restrictions.

[0010]

In order to achieve the above object, a focal plane shutter for a camera according to the present invention comprises:
Two base plates each forming a substantially rectangular opening for the optical path of the subject and forming at least one blade chamber between the two base plates, and the upper and lower directions of the both apertures arranged in the blade chamber. Set with at least one shutter blade that operates in parallel with at least one drive member that activates the shutter blade by the biasing force of the drive spring during shooting and a set that operates the drive member against the biasing force of the drive spring during operation An opening and closing mechanism that is attached to one of the two main plates in one of the lateral areas of the opening and a member in the other lateral area of the opening. A motor mounted on either one of the two base plates in a manner that the length direction of the rotary shaft is aligned with the operation direction of the shutter blades, and arranged in the lower region of both openings. There have to as and a transmission mechanism for transmitting the operation of the motor to the setting member.

In this case, the opening / closing operation mechanism and the motor may be attached to the same ground plate of the two ground plates, or the opening / closing operation mechanism and the motor may be mounted on the two ground plates. It can also be attached separately to.

In order to achieve the above-mentioned object, the focal plane shutter for a camera of the present invention has at least one blade chamber formed between the two, each of which has a substantially rectangular opening for the optical path of the subject. Two main boards that make up,
At least one shutter blade that is disposed in the blade chamber and that operates in the vertical direction of both openings, and at least one drive member that operates the shutter blade by the urging force of the drive spring during shooting, and the drive when the set operation is performed. A setting member for actuating the member against the biasing force of the drive spring, the member being arranged in a lateral region of one of the openings formed in one of the two base plates, Opening and closing mechanism attached to one side,
The opening and closing mechanism is arranged back to back in one side area of the opening formed in the other of the two main plates, and the two of them are arranged so that the length direction of the rotating shaft matches the operating direction of the shutter blades. A motor that is attached to any one of the ground planes and drives the setting member may be provided.

[0013]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described with reference to two illustrated examples. 1 and 2 are for explaining the first embodiment, and FIGS. 3 to 6 are for explaining the second embodiment. The first embodiment has two shutter blades and is configured as a focal plane shutter that can be used in both a silver halide camera and a digital still camera, and the second embodiment is a shutter. The focal plane shutter has only one blade and can be used only in a digital still camera.

[First Embodiment] First, a first embodiment will be described with reference to FIGS. 1 and 2. FIG. 1 shows a state immediately after the end of the exposure operation of the present embodiment, FIG. 1 (a) is a plan view seen from the subject side, and FIG. 1 (b) is FIG.
It is a bottom view of (a). Further, FIG. 2 shows a state in which the set operation is completed but the motor is still rotating, and FIG. 2A is a plan view seen from the subject side, and FIG. FIG. 3 is a bottom view of FIG. As described above, the present embodiment is configured to be applicable to both a silver salt camera and a digital still camera, but for the time being, it is assumed that the silver salt camera is adopted. The description will proceed with reference to the case where it is adopted in the digital still camera in the last part, and a modified example of this embodiment in that case.

First, the configuration of this embodiment will be described. The shutter base plate 1 of the present embodiment is made of synthetic resin, and has an opening 1a for a subject optical path formed at a substantially central portion. Also,
As is well known, an intermediate plate and an auxiliary ground plate 2 are attached to the back surface side of the shutter base plate 1 at predetermined intervals by appropriate means, and a blade of a rear blade is provided between the shutter base plate 1 and the intermediate plate. A chamber is formed, and a vane chamber of the leading blade is formed between the intermediate plate and the auxiliary base plate 2. The intermediate plate is not shown because a wall formed around the shutter base plate 1 at a right angle to the base plate surface closes the space between these three plate members. Also, the openings 1 are formed in the intermediate plate and the auxiliary ground plate 2.
An opening having a shape similar to that of a is formed, and in the case of the present embodiment, these three openings are overlapped to form an exposure opening having a horizontally long rectangular shape.

In FIG. 1 (a), an opening / closing operation mechanism 3 is attached to a lateral region on the left side of the opening 1a. The opening / closing operation mechanism 3 is arranged between the shutter base plate 1 and a support plate attached to the subject side from the shutter base plate 1 with a predetermined space therebetween, and various configurations thereof have been conventionally known. Since it is needless to say that the detailed description is omitted, specific illustrations are omitted in order to make the drawings easy to see, and in FIG. 1 and FIG. There is. However, the opening / closing mechanism 3 is provided for controlling two driving members that actuate the leading blade and the trailing blade by the biasing forces of the respective driving springs during the exposure operation, and the operation start time. Two electromagnets that are present and a set member that operates these drive members against the biasing force of the drive spring when the set is operated are included as essential members.

On the subject side of the shutter base plate 1, a shaft 1 is provided.
b is erected, and the charge member 4 is rotatably attached thereto. And this charging member 4
Is urged by a spring (not shown) to rotate counterclockwise in FIG. 1 (a), and is connected to the above-mentioned set member (not shown) via the link member 5. It should be noted that, although not exactly the same, a configuration example of the opening / closing operation mechanism 3 in this embodiment and a configuration example in which the setting member and the charging member 4 are connected via the link member 5 are utility model registration No. 2521235. It is described in Japanese Patent Publication No. Therefore, the following explanation of the operation will be made on the assumption that the opening / closing operation mechanism of the present embodiment has substantially the configuration shown in FIG. 3 of the publication.

In FIG. 1 (a), a motor 6 is arranged in a lateral region on the right side of the opening 1a such that the lengthwise direction of the rotating shaft is vertical, and a gearbox is located below the motor 6. 7 is provided. Although not shown in detail, the gear box 7 is fixed to the shutter base plate 1 by a plurality of screws, and the motor 6 has its lower end attached to the gear box 7. However, since the upper end portion becomes unstable just by mounting the slender motor 6 in this way, the upper portion thereof is pressed by the belt-shaped portion 1c formed integrally with the shutter base plate 1, and the tip of the belt-shaped portion 1c is pressed. It is fixed to the shutter base plate 1 by means not explicitly shown.

The internal structure of the gearbox 7 will be described. All the components arranged inside the gear box 7 are rotating members. However, since it is not necessary to explain in detail the mounting configuration thereof, it is necessary to refer to FIGS.
In Fig. 1, only the arrangement of those components is shown so that it can be seen. First, the rotation of the gear 8 fixed to the output shaft of the motor 6 is transmitted to the gear 9 through the reduction gear train, and the gear 9 is formed integrally with the cam disk. Together with 10, they can be rotated clockwise in FIG. Further, the intermediary member 11 rotatably attached to the shaft 7a of the gear box 7 has a cam portion 11a and a pin 11b, as can be seen from FIG. 1A, and the cam portion 11a has the above-mentioned structure. The cam board 10 can be contacted.

Next, the components arranged below the exposure opening, that is, the components shown below the opening 1a in FIG. 1A will be described. Slide member 12
Is attached to the two guide pins provided on the auxiliary base plate 2 so as to be movable only in the left-right direction, and the bent portion 12a provided at one end is inserted into the gear box 7, and the pin of the intermediate member 11 is inserted. 11b can be contacted. Further, a shaft 12b is erected on the other end of the slide member 12, and a tip portion of the shaft 12b projects to the surface of the shutter base plate 1 on the object side. Further, the link member 13 is rotatably attached to the shaft 4a of the charging member 4 at one end and to the shaft 12b of the slide member 12 at the other end. Therefore, in this embodiment, the gear 9 to the link member 5 constitute a transmission mechanism.

Next, the structure of the two shutter blades arranged on the back side of the shutter base plate 1 will be described. However, since these structures are well known, in FIGS. 1 (a) and 2 (a), Not explicitly stated, only some of them are shown. First, the rear blade is arranged in a blade chamber formed by the shutter base plate 1 and an intermediate plate (not shown), and one end thereof is pivotally attached to the shutter base plate 1 in a region on the left side of the opening 1a. Arms 14 and 15 and four blades 16 and 1 that are sequentially pivoted toward their other ends
7, 18 and 19 are arranged in the blade chamber with the arms 14 and 15 being closer to the shutter base plate 1 than the blades 16 to 19.

On the other hand, the front blade has the same structure as the rear blade, but is arranged in a blade chamber formed between an intermediate plate (not shown) and the auxiliary base plate 2 with the rear blade turned upside down. ing. Therefore, the leading blades are two arms that are pivotally attached to the shutter base plate 1 and four arms that are pivotally supported by them in order.
However, since the two arms are arranged closer to the auxiliary ground plate 2 than the four blades, the four blades 20 are provided in FIG. 2A. ，
Only 21,22,23 are shown. The leading blade is connected to a leading blade drive member (not shown), which is a constituent member of the opening / closing operation mechanism 3, by a well-known configuration, and the trailing blade is a constituent member of the opening / closing operation mechanism 3. It is connected to a rear blade drive member (not shown).

Next, the operation of this embodiment will be described. Figure 1
Shows the state immediately after the end of the exposure operation. Therefore, in FIG. 1A, four blades 20 to
23 is in a superposed state and is stored in a position below the opening 1a, and the four rear blades 16 to 19 are in a developed state and cover the opening 1a. Further, the charging member 4 is biased by the biasing force of the spring so as to rotate counterclockwise, but in the case of the present embodiment, it is stopped at a predetermined position by a stopper (not shown). There is. Therefore, the slide member 12 is the link member 13
Although it has been moved to the right by the maximum,
The intermediary member 11 can rotate slightly between the bent portion 12 a and the cam board 10. However, it is not always necessary to provide the stopper for the charge member 4 as described above, and if not provided, the bent portion 12a of the slide member 12 pushes the pin 11b of the intermediary member 11 to cause the cam portion 11a to move to the cam disk. It will be in the state of being in contact with 10.

In such a state of FIG. 1, when the set start signal is input, the motor 6 starts to rotate, and FIG.
At, the gear 9 is rotated clockwise. Therefore, the cam board 10 is also rotated in the clockwise direction, and the cam portion 11a is pushed by the cam surface to rotate the intermediary member 11 in the clockwise direction, so that the pin 11b of the intermediary member 11 is bent at the bent portion 12a.
Press to move the slide member 12 to the left. As a result, the charge member 4 is rotated clockwise via the link member 13 against the urging force of a spring (not shown) in FIG. The setting member of the mechanism 3 is operated. As a result, as is well known, the set member rotates the leading blade driving member and the trailing blade driving member at slightly different timings and rotates against the biasing force of those driving springs.

First, when the driving member for the leading blade is rotated, the arm of the leading blade (not shown) is rotated counterclockwise in FIG. 1 (a), so that it is stored at a position below the opening 1a. The four blades 20-23 of the leading blade are
It moves upward while reducing the overlap between adjacent blades. When the slit forming blade 23 of the leading blade and the slit forming blade 19 of the trailing blade are overlapped by a predetermined amount, the set member also starts rotating the driving member for the trailing blade. Therefore, the arms 14 and 15 of the rear blade are rotated counterclockwise, and the four blades 16 to 19 operate upward while increasing the overlap between the adjacent blades.

After that, the four front blades 20 to 23 are in a developed state to cover the exposure opening, and the four rear blades 16 to 19 are in a superposed state to be located above the opening 1a. The state when stored is shown in FIG. However, in this state, the motor 6 is still rotating. Then, from this state, the cam surface of the cam board 10 is gradually withdrawn from the cam portion 11a of the intermediary member 11 at first and then rapidly withdrawn. Therefore, the charging member 4 rotates counterclockwise in FIG. 2A by the urging force of a spring (not shown), the bent portion 12a of the slide member 12 pushes the pin 11b of the intermediary member 11, and the cam portion 11a. To follow the cam surface of the cam board 10.

At this time, by rotating the charging member 4 in the counterclockwise direction, the set member of the opening / closing operation mechanism 3 retreats from the leading blade driving member and the trailing blade driving member. Starts slightly reversely following the set member by the urging force of each driving member, but its rotation is immediately stopped by each locking member (not shown). Therefore, the leading blade and the trailing blade are stopped by a very slight actuation, and substantially maintain the state of FIG. 2A, but the setting member rapidly separates from each driving member. When the counterclockwise rotation of the charging member 4 as described above is stopped in the state of FIG. 1, an optical sensor (not shown) detects a predetermined rotation position of the gear 9 and the rotation of the motor 6 is stopped. Stop. Therefore, the leading blade and the trailing blade substantially maintain the state shown in FIG. 2A until the photographing is performed, and the transmission mechanism such as the charging member 4 and the slide member 12 is shown in FIG. It means that the state is maintained.

When the release button of the camera is pressed during photographing, the signals from the exposure control circuit sequentially interrupt the power supply to the electromagnet for the leading blade and the electromagnet for the trailing blade, which are provided in the opening / closing mechanism 3, so that the leading blade electromagnet is disconnected. The engagement between the driving member and the trailing blade driving member is released in order. Thereby,
First, the leading blade drive member is rapidly rotated by the urging force of the leading blade drive spring to rotate the arm of the leading blade clockwise. Therefore, the four blades 20 to 23 of the leading blade
Moves downward from the state shown in FIG. 2A while increasing the overlap between adjacent blades, and opens the exposure opening at the upper edge of the slit forming blade 23.

After that, when the trailing blade drive member is rapidly rotated by the urging force of the trailing blade drive spring, the arms 14, 15 of the trailing blade are rotated in the clockwise direction to the position above the opening 1a. The four blades 16 to 19 of the rear blades that have been stored operate downward while reducing the overlap between adjacent blades, and close the exposure opening at the lower edge of the slit forming blade 19. Then, when the exposure of the film surface is completed by the slits formed by both of the slit forming blades 23 and 19, the leading blade driving member and the trailing blade driving member are stopped in order, as shown in FIG. It becomes a state. Thereafter, while the film is being wound up, the above-described set operation is performed.

As described above, in the case of this embodiment, the opening / closing mechanism 3 and the motor 6 are separately arranged in the regions on both sides of the opening 1a, and are attached to the shutter base plate 1 close to the opening 1a. Therefore, the overall configuration of the shutter unit is compact, and the left and right weight balance is also suitable. However, the auxiliary ground plate 2
In addition, a bent portion that is erected on the shutter base plate 1 side (that is, the subject side) may be provided, and the motor 6 and the gear box 7 may be attached to the bent portion, and the same effect can be obtained.

Although the present embodiment has been described on the premise that it is mounted on a silver salt camera, it can be mounted on a digital still camera as it is. Moreover, in the case of a digital still camera, it is not necessary to transfer the film in the left-right direction on the back side of the auxiliary base plate 2 unlike the silver salt camera. It is also possible to attach the shutter base plate 1 to the photographer side.

Further, in the case of the digital still camera, unlike the case of the silver halide camera, as described above, the arrangement of the opening / closing operation mechanism 3 and the motor 6 is not restricted, so that a part of the entire structure of this embodiment is provided. Can be modified. That is, although the opening / closing operation mechanism 3 is attached to the shutter base plate 1, the motor 6 and the gear box 7 are arranged on the side of the auxiliary base plate 2 so that they are attached to the shutter base plate 1 or the auxiliary base plate 2. It doesn't matter. Also,
It does not matter whether such a structure is assembled to the camera body with the shutter base plate 1 on the subject side or the photographer side.

[Second Embodiment] Next, the second embodiment will be described with reference to FIGS. 3 to 6. FIG. 3 shows the state immediately after the end of the exposure operation of the present embodiment. 3A is a plan view seen from the subject side, and FIG. 3B is FIG. 3A.
FIG. Further, FIG. 4 is a plan view of the state of FIG. 3A viewed from the image pickup device side. Further, FIG. 5 shows a state in which the setting operation is completed but the motor is still rotating in this embodiment, and FIG. 5A is a plan view seen from the subject side. 5 (b) is shown in FIG.
It is a bottom view of (a). FIG. 6 is a sectional view showing an example of a state in which the focal plane shutter of this embodiment is arranged in the digital still camera. Since this embodiment has only one shutter blade, it is used only in a digital still camera.

Therefore, first, the structure of this embodiment will be described. In each of the drawings, those parts which are considered to have no particular problem even if they are regarded as equivalent to the members and parts of the first embodiment are designated by the same reference numerals. , Only the configuration different from that of the first embodiment will be described. Shutter base plate 1 in this embodiment
Is made of synthetic resin, but as can be seen from FIG. 3 (a), the shape of the opening 1a formed substantially in the center is the first.
It is slightly different from the case of the embodiment, and the opening 1a
The area on the right side of is also a normal area because no motor is attached. Further, in the case of the present embodiment, the intermediate plate is not attached to the back side of the shutter base plate 1, but the auxiliary base plate 2 made of synthetic resin is merely attached. Then, one shutter blade is arranged between the two plate members. Therefore, the shutter blade of this embodiment does not have the concept of a leading blade or a trailing blade as in the first embodiment, but the configuration itself is exactly the same as that of the trailing blade in the first embodiment. The components have the same reference numerals.

Further, as clearly shown in FIG. 4, the auxiliary base plate 2 has substantially the same size and shape as the shutter base plate 1, and an opening 2a is formed at a substantially central portion thereof.
In the case of the present embodiment, the opening 2a has exactly the same shape as the opening 1a of the shutter base plate 1 and is arranged so as to overlap with the opening 1a. , 2a regulate the exposure aperture.
Further, in the case of the present embodiment, the opening / closing operation mechanism 3 is attached to the auxiliary base plate 2. However, the shape of each of the constituent members is the same as that of the first embodiment when seen through from the subject side, and they are attached so as to be in the same relational position with respect to the shutter blades. Therefore, the charging member 4 of the present embodiment is attached to the shaft 2b erected on the auxiliary ground plate 2, and by the spring not shown,
In FIG. 4, it is urged to rotate clockwise. Then, at the lower end thereof, the pin 4b is directed toward the subject side.
Is provided. Incidentally, in the case of the first embodiment, as described above, the opening / closing operation mechanism 3 includes the two drive members urged by the respective drive springs. Has only one shutter member, and therefore has only one driving member.

In FIG. 3 (a), a motor 24 is arranged in a region on the left side of the opening 1a such that the lengthwise direction of the rotary shaft is vertical. This motor 24 is generally a geared motor. It is said that a reduction gear is built in the lower part. Below the motor 24 is the box 2
5 is arranged, but this box 25
4 is attached to the lower end of the shutter 4, and is fixed to the shutter base plate 1 by a plurality of screws. Inside the box 25, a cam disk 26 fixed to the output shaft of the motor 24 and an intermediate member 27 rotatably attached to the shaft 25a are arranged. The intermediate member 27 is formed by a spring (not shown). , FIG. 3 (b), it is urged to rotate counterclockwise. In addition, the intermediary member 27 is provided in the sliding contact portion 2
7a and a pushing portion 27b, the sliding contact portion 27a is always in contact with the cam surface of the cam disk 26. Also, the pusher 2
7b projects toward the auxiliary base plate 2 side and can push the pin 4b of the charging member 4. Therefore, in this embodiment, the cam disk 26 to the link member 5 constitute a transmission mechanism.

Next, the operation of this embodiment will be described. 3 and 4 show a state immediately after the end of the exposure operation. Therefore, in FIG.
The blades 16 to 19 are in a developed state and cover the opening 1a. The charging member 4 is rotated counterclockwise by the biasing force of the spring and stopped by a stopper (not shown). At this time, the pin 4b of the charging member 4 and the pushing portion 27b of the intermediary member 27 are separated from each other.

In this state, when the set start signal is input, the motor 24 starts rotating, and in FIG.
The cam disk 26 is rotated counterclockwise, and the sliding surface 27a is pushed by the cam surface, and the intermediary member 27 is rotated clockwise against the urging force of a spring (not shown). Therefore, the pushing portion 27b of the intermediate member 27 is not
3b is pushed, the charge member 4 is rotated clockwise in FIG. 3A against the biasing force of the spring, and the opening / closing mechanism 3 is set through the link member 5 (see FIG. 4). Activate the member. As a result, as is well known, the set member rotates the drive member against the biasing force of the drive spring, so that the arms 14 and 15 are rotated counterclockwise, and the four blades 16 to 19 are It moves upward while increasing the overlap between adjacent blades.

FIG. 5 shows a state in which the four blades 16 to 19 are stored in a position above the opening 1a in a superposed state and the exposure openings (openings 1a and 2a) are fully opened. ing. However, in this state, the motor 24 is still rotating. Then, from this state, the cam surface of the cam board 26 is moved to the sliding contact portion 2 of the intermediary member 27.
Since the pressing force on 7a is released slowly at first and then rapidly, the charging member 4 is rotated counterclockwise in FIG. 5 (a) by the biasing force of the spring, and the pin 4b is moved toward the intermediate member 27. The pushing portion 27b is made to follow.

At this time, by rotating the charging member 4 in the counterclockwise direction, the setting member of the opening / closing operation mechanism 3 is retracted from the driving member, but the driving member is immediately locked by the locking member and set. Does not recover following the members. Therefore, the four blades 16 to 19 are substantially the same as in FIG.
While maintaining the state of (a), only the setting member continues to operate in cooperation with the charging member 4 and rapidly separates from the driving member. Then, the counterclockwise rotation of the charging member 4 becomes
When stopped in the state of FIG. 3, an optical sensor (not shown) detects a predetermined position of the intermediary member 27 and stops the rotation of the motor 24. Therefore, the shutter blades maintain the fully open state shown in FIG. 5A, and the charging member 4 and the intermediary member 27 maintain the state shown in FIG. 3 until photographing is performed.

When the release button of the camera is pressed during shooting, shooting is started in the fully opened state, and the exposure control circuit starts counting the exposure time. Then, when a predetermined exposure time elapses, the signal from the exposure control circuit cuts off the energization to the electromagnet and the locking by the locking member is released, so that the driving member is rapidly rotated by the urging force of the driving spring. Then, the arms 14 and 15 are rotated clockwise. Therefore, the four blades 16 to 19 stored in the upper position of the opening 1a operate downward while reducing the overlap between the adjacent blades, close the exposure opening, and the photographing ends. Then, after that, when the photographing information is transferred to the storage device, the set operation is started.

As described above, in the case of this embodiment, the description has been made on the case of the focal plane shutter for the digital still camera provided with only one shutter blade, but it will be fully understood from the comparison with the first embodiment. In order to be able to do so, the opening / closing operation mechanism 3 described in the present embodiment has the configuration of the opening / closing operation mechanism 3 described in the first embodiment (utility model registration No. 252123).
Substantially the same as the configuration shown in FIG. 3 of Japanese Patent Publication No. 5), in this embodiment, the digital still having two shutter blades without changing the arrangement of the opening / closing mechanism 3 and the motor 24. It can be a focal plane shutter for a camera. On the contrary, the first is
In the embodiment, only one shutter blade can be used as a focal plane shutter for a digital still camera.

By the way, FIG. 6 shows an example in which the focal plane shutter of this embodiment is assembled to a camera. This camera is a single-lens reflex digital still camera equipped with an optical viewfinder. Therefore, a mirror box 29 provided with a mount section 29a for an interchangeable lens is attached to the camera body 28. But,
Illustration of the mirror is omitted. An image sensor 30 is arranged on the photographer side of the shutter unit, and a monitor 31 is provided on the photographer side surface of the camera body 28. From FIG. 6, it can be understood how the focal plane shutter of the present embodiment can be arranged in the camera in a space-efficient manner. Further, since the motor 24 is arranged close to the optical axis as in the opening / closing mechanism 3, it can be understood that it is easy to design with excellent stability especially when the camera is held.

In the description of this embodiment, the motor 24 is attached to the shutter base plate 1 and the opening / closing operation mechanism 3 is attached to the auxiliary base plate 2. However, as can be seen from FIG. Even if it is attached to the base plate 2 and the opening / closing drive mechanism 3 is attached to the shutter base plate 1, the same effect can be obtained. Also, without changing the configuration in that way,
Even if the shutter unit of this embodiment is assembled with the opening / closing mechanism 3 facing the subject, the same effect can be obtained. Further, in the case of the present embodiment, in FIG. 6, the motor 24 is arranged on the subject side of the shutter base plate 1 and is indirectly attached to the shutter base plate 1,
In the state shown in FIG. 6, even if the auxiliary base plate 2 is provided with a bent portion standing upright on the subject side and is attached to the bent portion without changing the arrangement position of the motor 24, the same effect can be obtained. it can.

Further, in the description of the operation of the present embodiment, for convenience, the present embodiment has been described as operating as a normally open type shutter. However, in the case of a focal plane shutter, it is often operated as a normally closed type shutter regardless of whether or not the camera has a movable mirror. In this embodiment, there is no problem in operating as such a type of shutter. That is, in that case, the starting point of a series of operations is simply changed,
When shooting, until the release button is pressed,
When the release button is pressed, the shutter blades are opened by the set operation, and the photographing is started after the fully opened state of FIG. The closing operation may be performed so that the closed state is maintained even after the photographing information is transferred to the storage device.

The opening / closing mechanism of the focal-plane shutter for the camera has the following structure immediately before the start of the exposure operation.
As a mechanism for holding the driving member at the exposure operation start position, there are known a mechanism called a direct type and a mechanism called a locking type. The above embodiments have been described with reference to the locking type shown in FIG. 3 of the above-mentioned utility model registration No. 2521235, but the present invention is of such locking type. However, it is also possible to apply to a direct type.

[0047]

As described above, in the focal plane shutter for a camera of the present invention, a relatively large and slender motor, which is a drive source of the setting member during the setting operation, is exposed in the lateral region of the exposure opening as much as possible. Since it is mounted close to the opening and the length direction of the rotation axis is aligned with the operating direction of the shutter blades, it is possible to reduce restrictions on space and weight balance when designing the camera body side, and versatility. It has the feature of being excellent.

[Brief description of drawings]

1A and 1B show a state immediately after the end of an exposure operation of the first embodiment, FIG. 1A is a plan view seen from a subject side, and FIG. 1B is FIG. 1A. FIG.

FIG. 2 is a view showing a state in which the setting operation is completed but the motor is still rotating in the first embodiment, and FIG. 2A is a plan view seen from the subject side. Two
FIG. 2B is a bottom view of FIG.

3A and 3B show a state immediately after the end of the exposure operation of the second embodiment, FIG. 3A is a plan view seen from the subject side, and FIG. 3B is FIG. 3A. FIG.

FIG. 4 is a plan view of the state of FIG. 3A viewed from the image sensor side.

FIG. 5 is a view showing a state in which the setting operation is completed but the motor is still rotating in the second embodiment, and FIG. 5A is a plan view seen from the subject side. 5
FIG. 5B is a bottom view of FIG.

FIG. 6 is a cross-sectional view illustrating a state in which a focal plane shutter according to a second embodiment is arranged inside a digital still camera.

[Explanation of symbols]

1 Shutter base plate 1a, 2a Opening part 1b, 2b, 4a, 7a, 12b, 25a Shaft 1c Belt-shaped part 2 Auxiliary base plate 3 Opening / closing mechanism 4 Charge member 4b, 11b Pin 5, 13 Link member 6, 24 Motor 7 Gear box 8 , 9, gear 10, 26 cam board 11, 27 intermediary member 11a cam portion 12 slide member 12a bending portion 14, 15 arm 16, 17, 16, 19, 20, 21, 21, 23 blade 25 box 27a sliding contact portion 27b Pushing unit 28 Camera body 29 Mirror box 29a Mounting unit 30 Imaging device 31 Monitor

Claims (4)

[Claims] 1. Two base plates each forming an opening for a subject optical path having a substantially rectangular shape and forming at least one blade chamber therebetween, and both of the base plates arranged in the blade chamber. At least one shutter blade that operates in the vertical direction of the opening, at least one drive member that operates the shutter blade by the biasing force of the drive spring during shooting, and the drive member that resists the biasing force of the drive spring during the set operation. An opening and closing actuation mechanism that is attached to one of the two base plates in a lateral region of one of the openings, and the other of the openings. In a lateral region of the motor, the motor being attached to either one of the two base plates with the length direction of the rotating shaft aligned with the operating direction of the shutter blades, and the lower region of both openings. A focal plane shutter for a camera, comprising: a transmission mechanism that is disposed in a region and that transmits the operation of the motor to the setting member. 2. The focal plane shutter for a camera according to claim 1, wherein the opening / closing mechanism and the motor are attached to the same base plate of the two base plates. 3. The focal plane shutter for a camera according to claim 1, wherein the opening / closing mechanism and the motor are separately attached to the two base plates. 4. Two base plates, each of which has a substantially rectangular opening for the optical path of the subject and which constitutes at least one blade chamber between the two, and both of which are arranged in the blade chamber. At least one shutter blade that operates in the vertical direction of the opening, at least one drive member that operates the shutter blade by the biasing force of the drive spring during shooting, and the drive member that resists the biasing force of the drive spring during the set operation. An opening / closing operation mechanism that includes a setting member that is actuated in the above-described manner and that is disposed in one side region of an opening formed in one of the two main plates and is attached to either one of the two main plates. And the opening and closing mechanism is arranged back to back in one side area of the opening formed in the other of the two main plates, and the operation of the shutter blades in the longitudinal direction of the rotating shaft is performed. A focal-plane shutter for a camera, comprising: a motor that is attached to either one of the two base plates in accordance with a direction and that drives the setting member.