JP2003107559A - Focal plane shutter for camera - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a focal plane shutter for a camera which makes it possible to suitably arrange a motor for operating a set member while keeping a shutter unit compact. SOLUTION: The motor 17 is arranged in one side area of an opening part 1a while having its rotary shaft vertically at a distance from the set member 12. The rotation of this motor 17 after being transmitted to a gear 22 through a speed reducing gear train has its plane of rotation converted by a cam plate 21 and a converting member 23 to rotate a transmission member 13 on a axis 1u and the rotation is transmitted to the set member 12 through a link 14. Then the transmission member 13 and part of the link 14 operate in a hollow 1d of a shutter base plate 1, so even when its operation area is put over the motor 17, the size of the shutter unit along the optical axis need not be made large.

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 Recent focal plane shutters include a shutter blade having two shutter blades called a leading blade and a trailing blade, and a shutter blade having only one shutter blade. It is used in both film-based and digital cameras, the latter only in digital cameras. Further, among the former ones having two shutter blades, there is a so-called double light-shielding method. In the normal state, this shutter double-covers the exposure opening with two shutter blades, and at the time of photographing, the rear blade is moved to the exposure operation start position before the exposure operation is performed. . And this double shading type focal plane shutter is
It is usually used in cameras that use film,
It is not that it cannot be used in digital cameras.

In any of the above types, the basic structure of each shutter blade is the same, and two arms having one end pivotally attached to the shutter base plate and one arm pivotally supported by them. It is composed of one or more blades, and each blade is operated in the vertical direction of the camera to open and close the exposure opening. And the one with two shutter blades,
In order to prevent the two from interfering with each other in operation, it is common to partition the two base plates with an intermediate plate to form two vane chambers. For example, JP-A-11-326992
When it is configured as described in the publication, it is possible to eliminate the need for the intermediate plate, as in the case of one having one shutter blade.

Further, in these focal plane shutters, a drive member that operates the shutter blades by the biasing force of the drive spring during the exposure operation and a drive member that resists the biasing force of the drive spring during the set operation. And a set member, which are arranged close to one side region of the exposure aperture, but in the case of a focal plane shutter having two shutter blades, they are biased by respective drive springs. Two drive members are required, and the setting member is adapted to actuate both of these drive members during set operation. Recently, the setting member is usually operated by the driving force of a motor during the setting operation.

As described above, the present invention provides a focal plane shutter in which a set member that operates with a motor as a drive source at the time of set operation operates one or two drive members against the biasing force of a drive spring. Regarding the double shading method as described above, an example of such a structure is disclosed in Japanese Patent Publication No. 6-90383. In this publication, the set member is referred to as a charge cam (66), and the two drive members are referred to as a front drive lever (101) and a rear drive lever (71).

[0006]

By the way, as described in the above publication, conventionally, the motor is usually not attached to the shutter unit side but to the camera body side. Met. 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 with the drive of the diaphragm mechanism and the mirror mechanism. Even if the motor is shared, there may be no problem if the motor is attached to the shutter unit. In such a case, it is preferable to mount the motor on the shutter unit side. Therefore, some proposals have been made in which the motor is directly attached to the shutter unit.

However, apart from the case of using an expensive motor having a special shape and configuration, the axial length of the rotor is long as described in the above publication, which is advantageous in terms of cost. When using such a normal motor, the installation method is naturally restricted. That is, since it is necessary for the shutter unit to be as versatile as possible, the compactness of the unit itself must be emphasized as well as the functional and cost advantages. From such a viewpoint, it is extremely disadvantageous to mount the rotor so that its rotation axis is perpendicular to the shutter base plate.

For this reason, it is necessary to mount the rotor so that its rotation axis is parallel to the shutter base plate, but mounting it in the upper or lower region of the exposure opening increases the vertical dimension of the camera. This is not desirable in terms of design because it is likely to occur, and particularly when it is arranged in the upper region, it imposes restrictions on the configuration of the finder optical system including the mirror. Also, if the drive member and the set member are not arranged in the left and right side regions of the exposure opening, the distance to the set member becomes long and it is extremely difficult to configure a transmission mechanism between them. Be troublesome. Therefore, when the motor is attached to the shutter unit so that the rotation axis of the rotor is parallel to the shutter base plate, it is a lateral region where the drive member and the set member are arranged, and the exposure area is more than the set member. It is most preferable to mount the camera at a position apart from the opening with the lengthwise direction of the rotating shaft being the vertical direction of the camera (that is, the operating direction of the shutter blades).

However, when the motor is arranged in this way, some problems must be solved. That is, as can be seen from the above publications, the set member is
It is arranged so as to rotate on a plane perpendicular to the optical axis. On the other hand, since the motor is mounted as described above, its output shaft is arranged in the upper position or the lower position. Therefore, it is not possible to directly connect the two and some kind of transmission mechanism is required, but at that time, since the output shaft and the rotation axis of the set member intersect at a right angle, A conversion mechanism is also needed.

In order to solve such a problem, a member is provided near the output shaft so as to rotate about an axis parallel to the rotation axis of the set member by a conversion mechanism in the direction of the rotation axis, and the member is provided. The rotation of is transmitted to the set member through some means. However, in the shutter unit, the smaller the occupied area of the surface orthogonal to the optical axis, the greater the degree of freedom in camera design. However, in order to make such a configuration, it is inevitable that at least a part of the member is arranged so as to overlap the motor, and this time, the dimension occupied in the optical axis direction becomes too large and the shutter unit From the viewpoint of overall compactness, there is a problem that it becomes unfavorable.

The present invention has been made in order to solve such a problem, and an object of the present invention is to dispose a motor, which is a drive source of the setting member during the setting operation, in the setting member. When the shutter unit is arranged in the side area of the exposure opening that is farther from the opening than the setting member, the occupied area of the shutter unit orthogonal to the optical axis is as small as possible, and the dimension in the optical axis direction is also as small as possible. It is an object of the present invention to provide a focal plane shutter for a camera, which is small in size, low in cost, and excellent in versatility.

[0012]

In order to achieve the above object, a focal plane shutter for a camera according to the present invention comprises:
Two base plates each having an opening for exposure and forming at least one blade chamber therebetween, and at least one shutter arranged in the blade chamber and operating in the vertical direction of the opening. A blade and at least one drive member that is attached to one of the two base plates in one side area of the opening outside the blade chamber and that operates the shutter blade by the urging force of a drive spring during shooting. A set member that is mounted in the vicinity of the drive member in the one side region and that operates the drive member against the biasing force of the drive spring during the set operation; and a rotating shaft in the one side region. A motor disposed at a position farther from the opening than the setting member, with its length direction aligned with the operation direction of the shutter blades; Has an operating region on the other side of the main plate and is attached to either one of the two main plates so that at least a part of the operating region overlaps the motor, and the rotation of the motor is set by the setting member. And a transmission means for transmitting to.

Further, in the focal plane shutter for a camera of the present invention, the main plate on which the motor is arranged outside the blade chamber has a second plate surface on the other main plate side than the motor, If the transmission means is attached to the second plate surface, the related parts can be attached to one base plate, which is a very preferable structure in manufacturing.

Further, in the focal plane shutter for a camera of the present invention, the setting member and the transmitting means are rotatably mounted on an axis parallel to the optical axis, and they are connected by a link member. By doing so, a cost-effective configuration is obtained.

Further, in the focal plane shutter for a camera of the present invention, the transmission means may be composed of one or more gears and a link connected to the gears.

[0016]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described with reference to the illustrated examples. The present embodiment is configured as a focal plane shutter having the two shutter blades described above, and FIG. 1 is a plan view of the embodiment viewed from the subject side, that is, the taking lens side, immediately after the end of the exposure operation. 2 is a bottom view of FIG. 1 viewed from below. FIG. 3 is a plan view showing the shutter base plate in FIG. 1 in a single component state. Furthermore, FIG.
Is a plan view of the embodiment viewed in the same manner as in FIG.
FIG. 5 shows the set state of the shutter, and FIG.
It is the bottom view seen from below. In the description of this embodiment, for convenience, the subject side of each component will be referred to as the front side, and the side on which the CCD, film, etc. are disposed will be referred to as the back side.

First, the configuration of this embodiment will be described. The shutter base plate 1 of the present embodiment is made of a synthetic resin and has an opening 1a for exposure, which is a horizontally long rectangle. Further, as shown in FIG. 2, on the back side of the shutter base plate 1, an intermediate plate 2 and an auxiliary base plate 3 are attached in order at predetermined intervals, and between the shutter base plate 1 and the intermediate plate 2. A vane chamber for the leading vane is formed on the above, and a vane chamber for the trailing vane is formed between the intermediate plate 2 and the auxiliary base plate 3. And auxiliary ground plate 3
A plurality of wall portions 3a formed around the area partially close the space between the three plate members. Further, the intermediate plate 2 and the auxiliary base plate 3 are also formed with openings having a shape similar to the opening 1a. Normally, these three openings are overlapped to form an exposure opening as a photographing image frame. In this embodiment, the shape of the opening 1a regulates the exposure opening.

Therefore, first, the main shape of the shutter base plate 1 will be described with reference to FIGS. The shutter base plate 1 of the present embodiment is made of synthetic resin, and of the surfaces on the front surface side of the shutter base plate 1, the same surface as the peripheral portion of the opening 1a is the reference surface A. Then, on the left side of the side areas of the opening 1a, an arc-shaped two long holes 1b, 1c are formed, 1b ₁ recess around their lower ends, 1c ₁ is formed. Further, in the lower left area of the shutter base plate 1, a recess 1d having a large area is formed on the auxiliary base plate 3 side with respect to the reference plane A so as to be a plate surface parallel to the reference plane A. the recesses in the 1d is slightly shallower than the recesses 1d two stepped portions 1d _1, 1d _2, and some deep one stepped portion 1d ₃ than recess 1d is formed. The two slopes 1d ₄ and 1d are provided between the depression 1d and the step 1d _3.
4 are formed. Further, the stopper portion 1e is formed by utilizing the step between the depression 1d and the reference plane A.

A shaft 1f is erected by integral molding at a position near the upper portion of the elongated hole 1c, the tip portion of which is a small diameter portion, and a screw hole is formed in the tip surface. Further, a mounting portion 1g is formed at a position near the left side of the long hole 1c, and its subject side surface is formed as a receiving surface of a cylindrical motor described later. Further, the shutter base plate 1 is formed with a pair of screw holes 1h, 1h, one of which is formed in the step portion 1d ₂ . In addition, the shutter base plate 1 is formed with nine holes, and among them, three holes 1i, 1i, 1i are mounting holes to the camera body. In addition, the other six holes 1j, 1k, 1m, 1
Each of n, 1p, and 1q is a mounting hole for a member described later.

In FIG. 1, cushioning members 4 and 5 made of butyl rubber having a C-shaped planar shape are attached to the recesses 1b ₁ and 1c ₁ in a known manner. Also,
Shafts 1r, 1s, 1t, 1u, 1v and 1w are attached to the six holes 1j, 1k, 1m, 1n, 1p and 1q. Then, of those axes, the axes 1r and 1s
Is erected on both sides through the shutter base plate 1, and the shaft 1
The t and 1u are erected only on the front surface side, and the shafts 1v and 1w are erected only on the rear surface side.

The shaft 1u, like the shaft 1f, has a small-diameter end portion, and a screw hole is formed on the end surface thereof. The shafts 1f and 1u have distal end portions, respectively. A well-known support plate (not shown) and a printed wiring board are stacked,
It is screwed so as to be parallel to the shutter base plate 1. The front end of the shafts 1r and 1s is the shaft 1
Along with the tip of t, it is fitted in the hole provided in the support plate. Further, on the supporting plate, a front blade electromagnet and a rear blade electromagnet are attached to the shutter base plate 1 side, but in FIGS.
Only 7 is shown by a dashed line. 2 and 5, the space formed by the shutter base plate 1 and the support plate (and the printed wiring board) in this way is indicated by a chain double-dashed line.

A front blade drive member 8 made of synthetic resin is rotatably attached to the shaft 1r of the shutter base plate 1 so as to rotate clockwise by a well-known front blade drive spring (not shown). Being energized. The leading blade driving member 8 includes a pushed portion 8a, a driving pin 8b, and a mounting portion 8
The drive pin 8b provided on the back side has
The root portion of the shutter base plate 1 can come into contact with the cushioning member 4, and the tip portion thereof penetrates the elongated hole 1b and projects to the back side of the shutter base plate 1. Further, as is well known, the iron piece member 9 is attached to the attachment portion 8c with a spring (not shown) interposed therebetween, and the iron core 6 of the electromagnet for the leading blade described above is attached.
It can be held by adsorption.

A rear blade drive member 10 made of synthetic resin is rotatably mounted on the shaft 1s of the shutter base plate 1 so that it can be rotated clockwise by a well-known rear blade drive spring (not shown). Being energized. Further, the trailing blade drive member 10 includes a roller 10a and a drive pin 10.
b, has a mounting portion 10c. The root of the drive pin 10b can come into contact with the buffer member 5 described above, and the tip of the drive pin 10b penetrates the elongated hole 1c and projects to the rear side of the shutter base plate 1. Further, similarly to the case of the driving member 8 for the leading blade, the iron piece member 11 is mounted to the mounting portion 10c with a spring interposed therebetween, as is well known, and the iron core 7 of the electromagnet for the trailing blade described above is mounted. It can be held by adsorption.

A set member 12 made of synthetic resin is rotatably attached to the shaft 1t of the shutter base plate 1. The setting member 12 is provided with two pushing portions 12a and 12b having a cam shape on the peripheral portion thereof, and a shaft 12c is provided on the rear surface side. Shutter base plate 1 depression 1d
The transmission member 13 is recessed in the shaft 1u which is erected on the shaft 1u.
It is rotatably mounted in d and is biased to rotate counterclockwise by a spring (not shown). Then, the transmission member 13 includes the pushed portion 1
3a and a shaft 13b are provided, and the shaft 13b is erected on the front surface side of the transmission member 13. The link 14 has holes provided at both ends rotatably fitted to the shaft 12c of the setting member 12 and the shaft 13b of the transmission member 13. In addition, the link 14 is provided with a bent portion 14a, a portion on the transmission member 13 side of the bent portion 14a operates in the recess 1d, and a portion on the setting member 12 side of the shutter base plate 1 is provided. It works on the subject side of the surface.

The gear box 15 has a pair of screw holes 1h and 1h provided on the shutter base plate 1 (see FIG. 3).
It is attached by screwing the screws 16, 16. The motor 17 is attached to the upper wall of the gear box 15 so that its rotation axis is in the vertical direction, and its upper portion contacts the mounting portion 1g of the shutter base plate 1 and the reference plane A. And gearbox 15
A gear 18 is fixed to the output shaft 17a protruding inward. In this embodiment, the motor 17 is attached to the gear box 15 attached to the shutter base plate 1, but it may be attached directly to the surface of the shutter base plate 1.

In the gear box 15, a shaft 15a is erected on the upper wall and shafts 15b, 15 are provided on the lower wall.
c and 15d are erected. And the shafts 15a, 15
The parent and child gears 19 and 20 are rotatably attached to b, and the parent gear of the parent and child gear 19 is the output shaft 1 of the motor 17.
It meshes with the gear 18 fixed to 7 a, and the slave gear meshes with the master gear of the master gear 20. A gear 22 integral with the cam plate 21 is rotatably attached to the shaft 15c, and meshes with a child gear of the parent-child gear 20. Further, the conversion member 23 is rotatably attached to the shaft 15d. The conversion member 23 is provided on the cam plate 21.
It has a sliding contact portion 23a which is in sliding contact with the cam surface and a pushing portion 23b which pushes the pushed portion 13a of the transmission member 13 during the setting operation.

Next, the structure of the two shutter blades arranged on the back side of the shutter base plate 1 will be described. Since these structures are well known, they are simply shown in FIGS. 1 and 4. There is. First, the leading blade is arranged in a blade chamber formed by the shutter base plate 1 and the intermediate plate 2, and has two arms 24 and 25 rotatably attached to the shafts 1r and 1v of the shutter base plate 1, and those arms. 1 is composed of three blades 26, 27, 28 pivotally supported in the length direction of the arm 24, but in FIG.
Only the slit-forming vanes 28 pivotally supported at the leading edge of are shown. The drive pin 8b of the drive member 8 for the leading blade is fitted into a long hole (not shown) formed in the arm 24.

On the other hand, the rear blade has exactly the same construction as the front blade, but is arranged inside the blade chamber provided between the intermediate plate 2 and the auxiliary base plate 3 with the front blade turned upside down.
Then, the subsequent blades are the shafts 1s and 1w of the shutter base plate 1.
Two arms 29, 3 rotatably attached to
0, and three blades 3 that are pivotally supported in order in their length direction.
1, 32, and 33, but in FIG. 4, only the slit forming blade 33 pivotally supported at the tip of the arms 29 and 30 is shown. The drive pin 10b of the rear blade drive member 10 is fitted into a long hole (not shown) formed in the arm 29.

Next, the operation of this embodiment will be described. Figure 1
Shows the state immediately after the end of the exposure operation. The leading blade drive member 8 and the trailing blade drive member 10 are respectively brought into contact with the cushioning members 4 and 5 by their drive pins 8b and 10b. Is prevented from rotating clockwise by the drive spring. Therefore, the three blades 26, 27, which are the leading blades,
28 is in a superposed state and is stored in a position below the opening 1a, and the three rear blades 31, 32, 33 are in a developed state and cover the opening 1a. The transmission member 13 is rotated counterclockwise by the urging force of a spring (not shown), and its rotation is blocked by the stopper portion 1e. Therefore, the setting member 12 is at the rotation limit position in the counterclockwise direction via the link 14, and this position is the initial position for the setting member 12.

In such a state of FIG. 1, when the set signal is inputted, the motor 17 starts to rotate and the gear 18 is rotated clockwise in FIG. 2, but the rotation is decelerated by the parent and child gears 19 and 20. , Rotate the gear 22 counterclockwise. Therefore, the cam plate 21 is also rotated counterclockwise, and the sliding surface 23a is pushed by the cam surface,
The conversion member 23 is rotated clockwise. When the conversion member 23 rotates in the clockwise direction, the pushing portion 23b moves the pushed portion 1b.
3a is pushed and the transmission member 13 is rotated clockwise in FIG. In this way, when the transmission member 13 rotates clockwise in FIG. 1 against the urging force of a spring (not shown), the rotation causes the setting member 12 to rotate clockwise via the link 14. However, in this embodiment, the transmission can be performed very suitably.

That is, the motor 17 is arranged in contact with the reference plane A of the shutter base plate 1, but the transmission member 13 is shown in FIG.
As can be seen from the above, since the operating surface is in the recess 1d, even if the transmission member 13 continues to rotate in the clockwise direction, a part thereof can enter the rear side of the motor 17. In addition, even if the transmission member 13 continues to rotate in the clockwise direction, the link 14 is connected to the transmission member 1 from the bent portion 14a.
The portion on the third side, including the connecting portion with the transmission member 13, operates in the step portion 1d ₁ . Therefore, during this set operation, the transmission member 13, the connecting portion between the transmission member 13 and the link 14, and the portion of the link 14 on the transmission member 13 side do not come into contact with the motor 17. Also,
A portion of the link 14 on the setting member 12 side of the bent portion 14a operates on the subject side of the reference plane A of the shutter base plate 1, but contacts the motor 17 in the operating region of the portion. Never. If there is a possibility of contact, extend the region of the step portion 1d and
The formation position of 4a may be changed to the set member 12 side.

When the setting member 12 starts rotating clockwise from the initial position by such a transmission mechanism, the pushing portion 12a pushes the pushed portion 8a of the leading blade driving member 8 to drive the leading blade. The member 8 is rotated counterclockwise against the urging force of the leading blade drive spring (not shown). As a result, the drive pin 8b of the drive member 8 for the leading blade rotates the arm 24 of the leading blade in the counterclockwise direction, so that the three blades 26 to 28 of the leading blade are operated upward while being expanded, and the opening portion is opened. Cover 1a.

After that, when the leading blade slit forming blade 28 and the trailing blade slit forming blade 33 are overlapped by a predetermined amount, the pushing portion 12b of the setting member 12 pushes the roller 10a of the trailing blade driving member 10. , Rear blade drive member 1
0 is rotated counterclockwise against the urging force of the rear blade drive spring (not shown). As a result, the drive pin 10b of the drive member 10 for the trailing blade rotates the arm 29 of the trailing blade in the counterclockwise direction, so that the three blades 31 to 33 of the trailing blade.
Are actuated upward while overlapping, and retreat from the opening 1a.

Through the series of operations described above, the gear 22
When the cam plate 21 which is integral with the above is brought into the state shown in FIG. 5, an optical sensor (not shown) detects the first position provided on the gear 22, and the detection signal stops the rotation of the motor 17 so that each component The member is in the state shown in FIG. 4, and this state is maintained until the next image capturing is performed. Therefore,
The state shown in FIGS. 4 and 5 is the set state. Then, in this set state, the leading blade drive member 8 replaces the iron piece member 9 with the iron core 6 of the leading blade electromagnet.
The trailing blade drive member 10 brings the iron piece member 11 into contact with the iron core 7 of the leading blade electromagnet. Further, the three blades 26 to 28 of the leading blades are in a developed state and cover the opening 1a, and the three blades 31 to 3 of the trailing blades.
3 is in a superposed state and is stored at a position above the opening 1a.

When the release button of the camera is pressed during photographing, first the electromagnets for the leading blade and the trailing blade are energized, and the iron cores 6, 7 attract and hold the iron piece members 9, 11 in contact with each other. To do. Next, the motor 17 is rotated in the same direction as described above to rotate the gear 18 clockwise and the gear 22 counterclockwise in FIG. Therefore, the cam plate 21 is rotated clockwise from the state of FIG. 5 to the state of FIG. 2, but the transmission member 13 is
In FIG. 4, the conversion member 23 is biased by a spring (not shown) so as to rotate counterclockwise.
Is rotated counterclockwise in FIG. 5 by its urging force.

On the other hand, when the transmission member 13 rotates counterclockwise in FIG. 4, the setting member 12 also rotates counterclockwise via the link 14. Therefore, the pushing portion 12a retracts from the pushed portion 8a, and the pushing portion 12b recedes from the roller 10a. However, the leading blade driving member 8 and the trailing blade driving member 10 have the iron piece members 9 and 11, respectively. Is sucked and held by the iron cores 6 and 7, so that it does not rotate together with the leading blade and the trailing blade. Then, when the rotation of the transmission member 13 is stopped by the stopper portion 1e and the setting member 12 stops at the initial position, immediately after that, an optical sensor (not shown) detects the second position provided on the gear 22, The motor 17 is stopped by the detection signal.

After the setting member 12 returns to the initial position in this way, the exposure time control circuit first disconnects the power supply to the leading blade electromagnet. Therefore, the attraction force of the iron core 6 to the iron piece member 9 is lost, and the leading blade drive member 8 is rotated clockwise by the strong urging force of the leading blade drive spring (not shown). As a result, the drive pin 8b of the drive member 8 for the leading blade rotates the arm 24 of the leading blade in the clockwise direction from the state of FIG. 4, so that the three blades 26 to 28 of the leading blade operate downward and the slit The opening 1a is opened by the slit forming edge which is the upper edge of the forming blade 28. After that, immediately after the slit forming edge of the slit forming blade 28 is completely retracted from the opening 1a, the driving pin 8b is stopped by coming into contact with the buffer member 4, and the leading blade driving member 8 and the leading blade are exposed. Ends.

After a predetermined time has passed since the leading blade drive member 8 started the exposure operation, the power supply to the trailing blade electromagnet is cut off. Therefore, the attraction force of the iron core 7 to the iron piece member 11 is lost, and the trailing blade drive member 10 is rotated clockwise by the strong urging force of the trailing blade drive spring (not shown). As a result, the rear blade drive member 10
Drive pin 10b rotates the arm 29 of the trailing blade in the clockwise direction, so that the three blades 31 to 33 of the trailing blade operate downward, and by the slit forming edge which is the lower edge of the slit forming blade 33. , The opening 1a is covered. Then, the three blades 31 to 33 are in a developed state and the opening 1
When a is completely closed, the drive pin 10b is stopped by coming into contact with the buffer member 5, and the exposure operation of the rear blade drive member 10 and the rear blade is completed. 1 and 2 show the state at this time.

In the embodiment, the transmission member 13 is rotatably attached to the shaft 1u provided upright in the recess 1d of the shutter base plate 1, but the shaft 1u is provided upright on the auxiliary base plate 3. It doesn't matter. In short, the transmission member 13 has a portion where the position where the transmission member 13 overlaps with the arrangement position of the motor 17 during operation.
It suffices that the shutter base plate 1 is arranged so as to operate on the side of the auxiliary base plate 3 with respect to the reference plane A of the shutter base plate 1 in which the shutter base plate 7 is arranged. It should be.

In addition, in the embodiment, the transmission member 13 and the link 14 constitute the transmission means of the present invention. Therefore, at the time of the set operation, the transmission member 13 is replaced by the conversion member 2
3 is rotated by being pressed by 3, and the setting member 1 is connected via the link 14.
2 is rotated, but the conversion member 23 and the transmission member 13 are not provided, a gear is attached to the shaft 1u instead of the transmission member 13, and the link 14 connected to the eccentric position of the gear is operated. May be. Further, a gear that rotates integrally with the setting member 12 is formed without the link 14, and the gear is provided directly on the gear provided in place of the transmission member 13 or on another gear. It may be configured to be connected via. However, since it is necessary to dispose the gear provided instead of the transmission member 13 so as not to affect the disposition of the motor 17, the motor 17 is disposed similarly to the case of the transmission member 13. It is necessary to have an arrangement configuration in which the shutter base plate 1 operates on the side of the auxiliary base plate 3 with respect to the reference plane A.

Further, since the above embodiment has the two shutter blades, the leading blade and the trailing blade, two driving members are provided, and at the time of set operation, they are operated by one set member. However, the present invention is not limited to such a configuration, and can be applied to a focal-plane shutter dedicated to a digital camera having only one shutter blade described above. Further, the focal plane shutter for a camera is referred to as a direct type as a mechanism for holding the leading blade driving member and the trailing blade driving member at the exposure operation start position in a state immediately before the start of the exposure operation. What is called a locking type is known. Further, although the above embodiment is configured as a direct type shutter, the present invention is not limited to such a direct type shutter, but can be applied to a locking type. .

[0042]

As described above, according to the present invention, the motor for operating the setting member is arranged such that the lengthwise direction of the rotating shaft is set in the lateral region of the exposure opening formed on one of the base plates. Even if the shutter blade is arranged at a position farther from the exposure opening than the setting member in accordance with the operating direction of the shutter blades, a transmission means for transmitting the driving force of the motor to the setting member is provided on the other main plate side than the motor. Since it is configured to operate, even if at least a part of the operation area of the transmission means overlaps with the motor, the arrangement of the transmission means allows
The size of the shutter unit in the optical axis direction does not increase, which is extremely effective for making the shutter unit compact.

[Brief description of drawings]

FIG. 1 is a plan view of an embodiment viewed from a subject side, that is, a photographing lens side, showing a state immediately after an exposure operation is completed.

FIG. 2 is a bottom view seen from below in FIG.

FIG. 3 is a plan view showing the shutter base plate in FIG. 1 in a single component state.

FIG. 4 is a plan view of the embodiment viewed in the same manner as FIG. 1, showing a set state of shutters.

5 is a bottom view seen from the lower side of FIG. 4. FIG.

[Explanation of symbols]

1 shutter base plate 1a opening 1b, 1c elongated holes 1b _1, 1c _1, 1d recess 1d _1, 1d _2, 1d _3-stage portion 1d ₄ slope 1e stopper 1f, 1r, 1s, 1t, 1u, 1v, 1w, 12c ，
13b, 15a, 15b, 15c, 15d Shaft 1g Mounting part 1h Screw holes 1i, 1j, 1k, 1m, 1n, 1p, 1q Hole 2 Intermediate plate 3 Auxiliary ground plate 3a Wall part 4, 5 Buffer member 6, 7 Iron core 8 Leading blade driving members 8a, 13a Pushed portions 8b, 13b Driving pins 8c, 10c Mounting portions 9, 11 Iron piece member 10 Trailing blade driving member 10a Roller 12 Set members 12a, 12b, 23b Pushing portion 13 Transmission member 14 link 14a bent part 15 gear box 16 screw 17 motor 17a output shaft 18,22 gear 19,20 parent-child gear 21 cam plate 23 conversion member 23a sliding contact part 24,25,29,30 arm 26,27,28,31 , 32, 33 Blade A Reference plane

Claims (4)

[Claims] 1. Two base plates each having an opening for exposure and forming at least one vane chamber between the two, and two base plates arranged in the vane chamber and operating in the vertical direction of the aperture. At least one shutter blade and at least one shutter blade that is attached to one of the two base plates in one lateral region of the opening outside the blade chamber, and operates the shutter blade by the biasing force of a drive spring during shooting. One driving member, a setting member mounted in the vicinity of the driving member in the one lateral region and actuating the driving member against the biasing force of the driving spring during the setting operation, and the one side In the region, the longitudinal direction of the rotating shaft is aligned with the operating direction of the shutter blades, and the motor is arranged at a position farther from the opening than the setting member. And an operating region on the other main plate side of the motor, and the operating region is attached to either one of the two main plates so that at least a part of the operating region overlaps with the motor. A focal plane shutter for a camera, comprising: 2. A base plate in which the motor is arranged outside the blade chamber has a second plate surface on the other base plate side of the motor, and the transmission means is provided on the second plate surface. The focal plane shutter for a camera according to claim 1, wherein the focal plane shutter is attached. 3. The setting member and the transmission means are each rotatably mounted on an axis parallel to an optical axis,
The focal plane shutter for a camera according to claim 1, wherein the focal plane shutters are linked by a link member. 4. The focal plane for a camera according to claim 1, wherein the transmission means is composed of one or more gears and a link connected to the gears. Shutter.