JPH08201876A - Focal plane shutter for camera - Google Patents

Abstract

PURPOSE: To support respective driving members with both a shaft formed unitedly with a shutter base plate and a shaft installed concentrically with a supporting plate by fitting a driving member for a front vane and a driving member for a rear vane in both a first shaft and a second shaft in the way the members can rotate freely. CONSTITUTION: A driving member 14 for a front vane and a driving member 15 for a rear vane are attached to shafts 1m, 1n, respectively. In the state, the tip parts of the shafts 1m, 1n are positioned in the insides of fitting holes of respective driving members 14, 15. Further shafts are installed concentrically with the shaft 1m, 1n in a supporting plate 4. A circular projected part is formed at the tips of these shafts and fitted with a recessed part formed at the tip of each shaft 1m, 1n. In this way, not like a conventional way in which respective driving members 14, 15 are supported only with shafts unitedly formed in a shutter base plate 1; the driving members 14, 15 are supported with both shaft 1m, 1n unitedly formed with the shutter base plate 1 and the shafts concentrically formed with the shafts 1m, 1n in the supporting plate 4.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a shutter base plate made of synthetic resin, and driving members for opening and closing a front blade group and a rear blade group are provided between the shutter base plate and a support plate. The present invention relates to a focal-plane shutter for a camera, which is rotatably arranged on a support shaft integrally formed with the shutter base plate.

[0002]

2. Description of the Related Art Usually, the support shaft as described above is often made of metal, is planted in the shutter base plate, and extends to the vicinity of the support plate arranged substantially parallel to the shutter base plate. Moreover, the coil spring is wound to drive each driving member to rotate. Further, an electromagnet or the like for controlling the start of operation of each drive member is arranged in the space between the shutter base plate and the support plate. Also, regardless of the coil spring,
It is known that each drive member is driven by a motor,
In that case, the motor or a member for rotating each drive member in conjunction with the motor is arranged in the space.

[0003] Each driving member is required to rotate in a plane substantially parallel to the plane of the aperture and with stability when the blade group is run. Therefore, the support shaft is required to have a high degree of verticality with respect to the shutter base plate, and the driving member has a fitting length with the support shaft (to fit the support shaft in order to stabilize the operation). (Corresponding to the axial length of the hole provided in the drive member) must be increased. Further, if the fitting length is increased in this way, the friction surface becomes larger accordingly. Therefore, it is preferable that the support shaft be as thin as possible. To meet such requirements for verticality, length, and thickness with respect to the support shaft,
There is no particular problem when the support shaft is made of metal. However, recently, a shutter base plate has been made of synthetic resin, and a proposal for integrally forming the support shaft with the shutter base plate is made in Japanese Utility Model Publication No. 5-14268.

[0004]

However, the support shaft of each drive member is integrally formed with the shutter base plate.
Although it is advantageous for cost reduction and weight reduction, it is not without problems. That is, since the above-mentioned support shaft has a relatively extremely elongated shape portion as compared with other portions of the shutter base plate, it is difficult for molten material to flow sufficiently to the cavity at the tip of the shaft in the mold during molding. In addition, there is a problem that the axis is tilted due to the sink mark after molding, and the verticality is impaired, and a high-level molding technology is required. Further, since a shock is applied to the support shaft via the driving member every time photographing is performed, a certain degree of rigidity and strength are required. Therefore, since the support shaft is integrally formed, it is necessary to intentionally select a material suitable for the support shaft.

The present invention has been made in order to solve such a problem, and its object is to support each drive member only by a shaft integrally formed with a shutter base plate as in the conventional case. It is an object of the present invention to provide a focal-plane shutter for a camera that is supported by both a shaft integrally formed on the shutter base plate and a shaft concentrically provided on the shutter base plate.

[0006]

To achieve the above object, in the present invention, a shutter base plate made of synthetic resin and a shutter base plate are arranged so as to be substantially parallel to each other at a predetermined interval. A supporting plate, a leading blade driving member and a trailing blade driving member rotatably arranged between the shutter base plate and the supporting plate in a plane substantially parallel to them, and a leading blade that rotates each driving member. A focal plane shutter for a camera including a drive source for driving a rear blade and a drive source for driving a trailing blade, wherein a rotational axis of each of the driving member for the leading blade and the driving member for the trailing blade is integrally formed on the shutter base plate.
A leading shaft drive member and a trailing blade drive, the shaft being configured to include a shaft, and a second shaft that is provided on the support plate concentrically with the first shaft and has its front end opposed to the first shaft. The members are rotatably fitted to both the first shaft and the second shaft.

Further, in the focal plane shutter for a camera of the present invention, it is preferable that the support plate and the second shaft are integrally molded with a synthetic resin, and the first shaft and the second shaft are formed of one of The tip is formed in a convex shape and the other tip is formed in a concave shape so that the tips fit with each other.

Further, in the focal plane shutter for a camera of the present invention, it is preferable that the leading blade driving source and the trailing blade driving source are respectively located on a common axis between the first axis and the second axis. A torsion coil spring wound around one end of the torsion coil spring, and the other end of the torsion coil spring hooked on a driving force adjusting member that is arranged on the second shaft so that the rotational position can be adjusted. The drive member is provided with a rotational force, and at the same time, a spring characteristic is provided so that the drive force adjusting member and the drive member are constantly pressed in opposite directions.

[0009]

Embodiments of the present invention will be described with reference to FIGS. FIG. 1 is a front view of this embodiment showing a state after the exposure is completed. FIG. 2 is a part diagram showing a part of main components arranged on the front surface side of the shutter base plate in FIG.
FIG. 3 is a component diagram showing main components other than the components shown in FIG. 4 and 5 are enlarged views showing the shutter opening / closing mechanism in perspective in FIG. 1, and are shown separately in FIG. 4 and FIG. FIG. 6 is a left side view of FIG. FIG. 7 is a cross-sectional view of the main part of FIG. 6, and is a view rotated by 90 degrees for convenience. FIG. 8 is a sectional view showing an example of a main part in a conventional example. FIG. 9 is an explanatory diagram of the torsion coil spring in this embodiment.

FIG. 1 shows a state after the exposure is finished, and an exposure opening 1a formed in a shutter base plate 1 made of synthetic resin.
Is closed by a rear blade group 2 composed of four blades. At this time, the front blade group composed of a plurality of sheets is used for the exposure opening 1
It is in a superposed state at a position below a. Each of these blade groups is pivotally supported by a plurality of arms so as to form a parallelogram link mechanism. However, since their configuration and opening / closing operation are well known, detailed description thereof will be omitted.

The printed wiring board 3 and the support plate 4 are attached to the tips of the shafts 1b and 1c of the shutter base plate 1 with screws 5 and 6 so as to leave a predetermined space between them. There is. Various electric wirings necessary for this shutter are provided on the front surface side of the printed wiring board 3, and the shaded portions in FIGS. 1 and 6 indicate the soldering locations. . Reference numeral 3a indicates a connecting portion with the flash device, and reference numeral 3b indicates a connecting portion with the ground.
Reference numerals c and 3d indicate capacitors which are soldered.

As shown in FIGS. 3 (c) and 5, the printed wiring board 3 is soldered with two contact members 7 and 8 forming a switch mechanism for flash photography. The movable contact member 8 is arranged on the back side of the printed wiring board 3. The fixed-side contact member 7 is mainly arranged on the front surface side of the printed wiring board 3, but is bent from the middle to the back side, so that the contact portions 7a and 8a of both contact members 7 and 8 are formed on the back side of the printed wiring board 3. It is designed to be in contact. Since these contact members 7 and 8 are arranged so that a part of them overlap with each other with the printed wiring board 3 interposed therebetween, the utilization efficiency of the printed wiring board 3 can be improved as compared with the conventional configuration in which they are arranged on the same surface. This further contributes to the miniaturization of the printed wiring board 3 and the shutter.

As shown in FIG. 6, a cover plate 9 is attached to the shafts 1d, 1e, 1f, 1g of the shutter base plate 1 so as to form a blade chamber on the back surface of the shutter base plate 1. Further, on the back side of the shutter base plate 1, shafts 1h and 1i integrally formed of synthetic resin are attached to the main arm 10 for the leading blade group.
And a main arm 11 for the rear blade group is pivotally attached. Similarly, the shafts 1j, 1 provided on the back side of the shutter base plate 1
A sub arm 12 for the leading blade group and a sub arm 13 for the trailing blade group are pivotally attached to k, respectively. Further, springs 12a and 13a are stretched on the sub arms 12 and 13, respectively.

On the front side of the shutter base plate 1, the shaft 1 described above is provided.
Concentric with h and 1i, shafts 1m and 1n integrally formed with the shutter base plate 1 are provided. In FIG. 6, those axial positions are indicated by the one-dot chain line by using the same symbols.
Of these, the shape of the shaft 1n is clearly shown in FIG. 7, but the shape of the shaft 1m is exactly the same, and therefore the illustration thereof is omitted. As can be seen from FIG. 7, the tip of the shaft 1n is located at a substantially intermediate position between the shutter base plate 1 and the support plate 4, and a recess is formed at the tip. And this recess is shown in FIG.
It has a circular shape as shown in FIG.

A leading blade group driving member 14 and a trailing blade group driving member 15 are pivotally mounted on the shafts 1m and 1n, respectively.
In this state, the tip ends of the shafts 1m and 1n are located inside the fitting holes of the drive members. Drive member 1
Drive pins 14a and 15a are provided on the pins 4 and 15, respectively. These drive pins 14a, 15a penetrate through arc-shaped slots 1o, 1p formed in the shutter base plate 1, and are well-known holes (not shown) formed in the main arms 10, 11 on the back side of the shutter base plate 1. Is fitted to.

A roller 1 is provided on the back side of the driving members 14 and 15.
4b and 15b are provided. Further, rising portions 14c and 14d are provided on the front surface side of the leading blade group driving member 14, and a rising portion 15c is provided on the trailing blade group driving member 15. The rising portion 14c is adapted to come into contact with the contact portion 8a of the contact member 8 described above at its upper edge portion. As is well known, the shaft 14 is attached to the rising portions 14d and 15c.
Iron piece members 14f and 15e integrated with e and 15d are attached, and these iron piece members 14f and 15e are urged by springs in a direction away from the rising portions 14d and 15c.

As described above, the support plate 4 is attached to the shafts 1b and 1c of the shutter base plate 1. The support plate 4 is made of synthetic resin, and as shown in FIG. 3B, mounting portions 4a and 4b are provided on the shutter base plate 1 side, and the front blade group electromagnet 16 and the rear blade group electromagnet 17 are provided there. Are attached by screws 18 and 19. Each electromagnet 1
The iron cores 16a and 17a of 6, 7 are iron piece members 14f, 1
It comes into contact with 5e and can be held by electromagnetic force.

Further, the support plate 4 is provided with shafts 4c and 4d (see FIG. 3B) concentric with the shafts 1m and 1n. Circular protrusions are formed at the tips of the shafts 4c and 4d, and are fitted in the recesses formed at the tips of the shafts 1m and 1n. In the present embodiment, the shapes of the convex portion and the concave portion are circular, but if the concentricity between the shafts 1m, 1n and the shafts 4c, 4d can be ensured, the shape is not particularly limited. Further, the tip ends of the shafts 4c and 4d are as shown in FIG.
Like m and 1n, they are located inside the fitting holes of each drive member. Therefore, the drive member 14 is rotatably fitted to both the shafts 1m and 4c, and the drive member 15 is fitted to both the shafts 1n and 4d. That is, the conventional support shaft is composed of the two shafts 1m, 4c and 1n, 4d.

Ratchet gears 20, 2 are attached to the shafts 4c, 4d.
1 is rotatably fitted. A torsion coil spring 22 is wound around the shafts 1m and 4c, and a torsion coil spring 23 is wound around the shafts 1n and 4d. Then, one end of each of the torsion coil springs 22 and 23 is formed in the ratchet gears 20 and 21 by a thread (in FIG. 7, the thread of the ratchet gear 21 is indicated by reference numeral 21a. The ratchet gear 20 is also the same, so the illustration is omitted). And the other end is the rising portion 14 of the driving members 14 and 15.
d, 15c.

Ratchet pawls 4e and 4f are formed on the support plate 4, mesh with teeth formed on the outer peripheral portions of the ratchet gears 20 and 21, and the rotation of the ratchet gears 20 and 21 is stopped by the torsion coil springs 22 and 23. Are doing When adjusting the rotational driving force of each drive member 14 and 15, the ratchet gears 20 and 2 are removed by removing the ratchet pawls 4e and 4f.
After rotating 1 to adjust the strength of the torsion coil springs 22 and 23, they are again meshed with the ratchet gears 20 and 21.

Further, a method of using the torsion coil springs 22 and 23 in this embodiment will be described with reference to FIGS. 8 and 9. FIG. 8 is a diagram showing a conventional method of using a torsion coil spring, and is a diagram drawn so as to be easily compared with FIG. 7. A support shaft X is integrally formed on a shutter base plate 1 made of synthetic resin, and a printed wiring board 3 and a support plate 4 are attached to the tip of the support shaft X by screws Y. A step portion X1 is formed on the support shaft X, a drive member 15 for the rear blade group is rotatably fitted to the thick shaft portion, and a ratchet gear 21 is rotatably fitted to the thin shaft portion. One end of the torsion coil spring Z is hooked on the rising portion 15c of the drive member 15, and the other end is hooked on the sliver 21a of the ratchet gear 21.

As can be seen from the fact that the ratchet gear 21 is drawn on the step portion X1 in FIG. 8, the torsion coil spring Z in this conventional example is shown.
Only serves to apply a rotational force to the drive member 15. Therefore, in some cases, the ratchet pawl 4f and the ratchet gear 21 may be disengaged from each other or the operation of the drive member 15 may become unstable due to vibration. Therefore, in order to prevent such a situation, the dimensions of the ratchet gear 21 and the drive member 15 in the axial direction must be controlled with high accuracy.

Differences of this embodiment from the structure of the conventional example will be described with reference to FIGS. As shown in FIG. 9B, the torsion coil springs 22 and 23 used in this embodiment are made so as to obtain a predetermined space dimension A in the winding axis direction as shown in FIG. 9B. . The state in which this is incorporated is shown in FIG. That is, when assembled, it is in a state of being compressed by the dimension B. In this embodiment, the torsion coil spring 2
2 and 23 repel this compression and push the drive members 14 and 15 and the ratchet gears 20 and 21 in opposite directions.

Therefore, when assembling the ratchet gears 20 and 21, it is not necessary to strictly control the axial dimension of the ratchet gears 20 and 21, and at the same time, the torsion coil springs 22 and
Reference numeral 23 designates the drive members 14 and 15 as ratchet gears 20 and 21.
Since the drive members 14 and 15 are not brought into contact with the shutter and the postures of the drive members 14 and 15 are regulated, the drive members 14 and 15 have an effect of being capable of performing stable rotation substantially parallel to the shutter base plate 1 and on a predetermined plane. . Further, in FIG. 7, a concave portion is formed on the lower side of the ratchet gear 21, and the concave portion is fitted in the convex portion formed on the upper end of the drive member 15. In this configuration, the ratchet gear 21 is mounted after the torsion coil spring 23 is assembled. This is to make it easier to assemble.

In this embodiment, ratchet gears 20 and 21 are provided to adjust the rotational driving force of the torsion coil springs 22 and 23, and the torsion coil springs 22 and 2 are provided.
Although one end of 3 is hung on it, it is also conceivable to hang the one end on a fixing member, for example, the support plate 4 without providing such ratchet gears 20 and 21. In such a case, the axial force of the torsion coil springs 22 and 23 effectively acts only on the drive members 14 and 15.

Next, a mechanism for setting the driving members 14 and 15 to the shutter charge position will be described. The setting member 24 shown in FIG. 1 has the shape shown in FIG.
It is pivotally attached to the shaft 1c of the shutter base plate 1 and is given a habit of rotating in the counterclockwise direction by a spring 25. The setting member 24 has pressing portions 24a and 24b. The pressing portion 24a can contact the roller 14b of the driving member 14, and the pressing portion 24b can contact the roller 15b of the driving member 15.

The operation of this embodiment having the above structure will be briefly described. First, the charging operation of the shutter will be described. When the setting member 24 is rotated clockwise in FIG. 5 in conjunction with the film winding, the pressing portion 24a first presses the roller 14b to rotate the driving member 14 counterclockwise. In the course of this rotation, the drive member 14 charges the torsion coil spring 22 and moves the main arm 10 by the drive pin 14a to move the leading blade group (not shown) to the charging position (exposure opening 1a in FIG. 1).
Move it to the position that covers).

The roller 15b of the driving member 15 is pushed by the pressing portion 24b of the setting member 24, and the driving member 15 starts rotating in the counterclockwise direction slightly later than the driving member 14. Drive member 1
In the course of this rotation, 5 charges the torsion coil spring 23 and moves the main arm 11 by the drive pin 15a to move the rear blade group 2 to the charging position (the position above the exposure opening 1a in FIG. 1).

The contact portion 8a of the contact member 8 moves upward by following the rising portion 14c by its own elastic force in the process of the counter blade driving member 14 rotating counterclockwise. The contact point portion 7a of is also followed by its own elastic force. Eventually, the contact member 7 stops moving upward due to a part of the contact member 7 contacting the end surface of the printed wiring board 3, but the contact member 8 still moves upward, so the contact portion 7a
And 8a are released. Thereafter, the contact member 8 also stops moving upward due to a part of the contact member 8 contacting the end surface of the printed wiring board 3.

Thereafter, the driving members 14 and 15 are still rotated counterclockwise, and the iron piece members 14f and 15e are moved to the electromagnet 1.
When the iron cores 16a and 17a of Nos. 6 and 17 come to contact with the iron cores 16a and 17a, the clockwise rotation of the set member 24 is stopped, and the set member 24 is held at the position together with the set member 24 by a camera side member (not shown). During this charging process, the number of turns of the torsion coil springs 22 and 23 changes, but the number is small as a whole.
5 and the forces on the ratchet gears 20, 21 are virtually unaffected.

Next, the release operation will be described. When the release button of the camera is pressed, the electromagnets 16 and 17 are first energized to hold the iron piece members 14f and 15e magnetically,
The holding force of the camera-side member described above is released, and the setting member 24 first returns. Thereafter, when the energization of the electromagnet 16 is cut off by the control signal from the electronic circuit, the driving member 14 for the leading blade group is rotated clockwise by the force of the torsion coil spring 22. As a result, the front blade group covering the exposure opening 1a runs downward while opening the exposure opening 1a. When the front blade group reaches the vicinity of the position where the exposure opening 1a is substantially completely opened, the rising portion 14 of the driving member 14 is
c presses the contact member 8, the contact portion 8a contacts the contact portion 7a of the contact member 7, and the flash is emitted.

After the driving member 14 for the leading blade group is released from the electromagnet 16, the driving member 15 for the trailing blade group is subsequently released from the electromagnet 17 by the control signal from the electronic circuit. Therefore, the driving member 15 is the torsion coil spring 2
The force of 3 rotates in the clockwise direction to drive the rear blade group 2. Then, the rear blade group 2 completely covers the exposure opening 1a as shown in FIG. Needless to say, in the case of performing normal shooting without performing flash shooting, the rear blade group 2 may travel before the front blade group completely opens the exposure opening 1a.

Next, a modification of the above embodiment will be described with reference to FIGS. 10, 11 and 12. In the example shown in FIG. 10, a shaft 4g is concentrically formed integrally with a support plate 4 made of synthetic resin on the opposite side of the shaft 4d. Of course, a similar shaft is formed on the opposite side of the shaft 4c. And
The holes provided in the printed wiring board 3 are fitted into these two shafts. In this way, the printed wiring board 3 is first positioned on the support plate 4, and then the screws 5, 6
By attaching the shutter base plate 1 to the shafts 1b and 1c of the shutter base plate 1, the positional relationship between the leading blade group driving member 14 and the contact members 7 and 8 becomes extremely accurate. Therefore, there is no variation in the contact timing of the contact members 7 and 8, and the number of steps for assembling and adjusting the contact members 7 and 8 can be reduced.

In FIG. 11, the shaft 1n and the shaft 4d shown in FIG. 10 are replaced by the tip surface 1n1 of the tip concave portion formed on the shaft 1n and the step surface of the tip convex portion formed on the shaft 4d. 4d1 is fitted so as to be in contact with 4d1. Of course, axis 1
The relationship between m and the shaft 4c has the same configuration. With such a configuration, the length of each support shaft formed by the shaft 1m and the shaft 4c, and the shaft 1n and the shaft 4d is reliably maintained, and stable operation of the drive members 14 and 15 is obtained. You can Therefore, the presence of axis 4g is not essential in this example. Further, this configuration also serves to maintain the gap between the shutter base plate 1 and the support plate 4 at a predetermined gap, which can contribute to making the support plate 4 and the printed wiring board 3 thinner.

FIG. 12 shows a modified example of the shutter base plate 1 shown in FIG. 2A. FIG. 12A is a front view and FIG. 12B is a right side surface of FIG. It is a figure. According to this example, the shutter opening / closing mechanism arranged on the front surface side of the shutter base plate 1 is integrally molded on the shutter base plate 1 over all the portions that do not affect the operation of the setting member 24.
q is formed. Then, when attaching the support plate 4 or the printed wiring board 3, the support plate 4 is fastened with screws 5 and 6 so as to contact the top surface of the wall 1q. Therefore, with this structure, the shutter opening / closing mechanism, especially the dustproof effect on the electromagnet is extremely large, and the vacant space is reinforced so that the shafts 1b, 1c screwed by the screws 5, 6 do not have insufficient strength. However, the screwing is stabilized.

The above explanations are all given to each drive member 1.
It has been described that the coil springs 4 and 15 are driven by the coil springs, but the present invention is not limited to this, and it is needless to say that the present invention can be applied to a motor in which each driving member is driven.

[0037]

As described above, according to the present invention, in the focal plane shutter for a camera, each driving member is not supported by only the shaft integrally formed on the shutter base plate as in the prior art, but is mounted on the shutter base plate. Since both the integrally formed shaft and the shaft concentrically provided on the support plate are supported, it becomes easy to flow the molten material into the cavity of the shaft when the shutter base plate is formed. It is possible to reduce the influence of sink marks after molding and solve the problem of impairing verticality. Therefore, it is possible to contribute to cost reduction without requiring advanced molding processing technology including selection of materials.

[Brief description of drawings]

FIG. 1 is a front view of an embodiment of the present invention showing a state after completion of exposure.

2A and 2B are part diagrams showing a part of main components arranged on the front surface side of the shutter base plate in FIG. 1, wherein FIG. 2A is a shutter base plate, FIG. 2B is a setting member, and FIG. c) shows each driving member for the leading blade group and the trailing blade group.

3A and 3B are component diagrams showing main components other than those shown in FIG. 2, in which FIG. 3A mainly supports the ratchet gears for the leading blade group and the trailing blade group, and FIG. Plate, figure (c)
Shows mainly a printed wiring board, and FIG. 7D shows a mounting screw for the support board and the printed wiring board.

FIG. 4 is an enlarged view showing a shutter opening / closing mechanism in a perspective manner in FIG. 1, and shows an upper part which is vertically divided into two parts in FIG.

5 is an enlarged view showing a shutter opening / closing mechanism in a perspective manner in FIG. 1, and shows a lower portion which is divided into upper and lower parts in FIG.

6 is a left side view of FIG. 1. FIG.

FIG. 7 is a diagram showing a cross section of a main part in FIG. 6, and is a diagram viewed by being rotated 90 degrees for convenience.

FIG. 8 is a sectional view showing an example of a main part in a conventional example.

9A and 9B are explanatory views of a torsion coil spring according to an embodiment of the present invention, FIG. 9A shows a state of being incorporated in a shutter, and FIG. 9B shows a state of a single component.

FIG. 10 is a cross-sectional view showing a modified example of the main part of the embodiment of the present invention.

FIG. 11 is a cross-sectional view showing another modified example of the main part of the embodiment of the present invention.

FIG. 12 shows a modified example of the shutter base plate in the embodiment of the present invention, FIG. 12 (a) is a front view, and FIG. 12 (b) is a right side view.

[Explanation of symbols]

 1 shutter base plate 1a exposure opening 1b, 1c, 1m, 1n, 4c, 4d axis 1q wall 2 rear blade group 3 printed wiring board 4 support plate 4e, 4f ratchet claw 5,6 screw 7,8 contact member 7a, 8a contact part 14 Drive member for front blade group 15 Drive member for rear blade group 14a, 15a Drive pin 14b, 15b Roller 14c, 14d, 15c Start-up part 14f, 15e Iron piece member 16 Electromagnet for front blade 16a, 17a Iron core 17 Electromagnet for front blade 20, 21 Ratchet gear 21a Threading 22, 23 Torsion coil spring 24 Set member 24a, 24b Pressing part

Claims (6)

[Claims] 1. A shutter base plate made of synthetic resin, a support plate arranged so as to be substantially parallel to the shutter base plate at a predetermined interval, and substantially parallel to them between the shutter base plate and the support plate. In a focal plane shutter for a camera, which includes a leading blade driving member and a trailing blade driving member rotatably arranged in a plane, and a leading blade driving source and a trailing blade driving source that rotate the driving members. Rotating shafts of the leading blade driving member and the trailing blade driving member respectively have a first shaft integrally formed with the shutter base plate, and a leading end of the first shaft and a leading end of the first shaft. And a second shaft concentrically provided on the support plate, and the leading blade driving member and the trailing blade driving member are rotatably fitted to both the first shaft and the second shaft, respectively. Camera fo -Calprene shutter. 2. The focal plane shutter for a camera according to claim 1, wherein the support plate and the second shaft are integrally formed of synthetic resin. 3. The first shaft and the second shaft are characterized in that one tip is formed in a convex shape and the other tip is formed in a concave shape, and these tips are fitted to each other. Item 1 or 2
The focal-plane shutter for the camera described in. 4. The first shaft and the second shaft are in axial contact with each other, and the distance between the shutter base plate and the support plate is regulated by both shafts. The focal plane shutter for a camera according to any one of claims. 5. The leading blade driving source and the trailing blade driving source are torsion coil springs wound around a common axis center of the first shaft and the second shaft, respectively. 5. The camera according to claim 1, wherein each of the driving members has a spring characteristic that applies a rotational force to each driving member and constantly presses each driving member in the axial direction of the rotation shaft. Focal plane shutter. 6. The torsion coil spring has one end hooked on each driving member and the other end hooked on a driving force adjusting member arranged on the second shaft so as to adjust a rotational position, The focal plane shutter for a camera according to claim 5, wherein the coil spring is provided with a spring characteristic of constantly pressing the driving force adjusting member in a direction opposite to the driving member.