JPH09133943A - Focal-plane shutter for camera - Google Patents

Abstract

PROBLEM TO BE SOLVED: To integrally mold a base plate part and an upper plate part of synthetic resin so that they may be nearly in parallel and to easily attach the rotary shaft of a turning member between both of them. SOLUTION: The upper plate part 1c is nearly in parallel with the base plate part 1b of a shutter base plate 1, and integrally molded with the base plate part 1b of the synthetic resin through supporting wall parts 1d, 1e, 1f and 1g. Two bearing holes 1r whose left side is partially opened are formed on the upper plate part 1c. Two bearing holes 1s having nearly the same shape are formed on the base plate part 1b so that a bearing position may be aligned with the bearing hole 1r. A front blade driving member and a rear blade driving member are attached by pressing the shafts integrally provided in the bearing holes 1r and 1s.

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 front blade group and a rear blade group are sequentially run in the same direction to perform shooting.

[0002]

2. Description of the Related Art In recent years, the use of synthetic resin for precision parts has advanced, and even in the focal plane shutter for cameras, the shutter blades and the shutter base plate are also made of synthetic resin. In particular, in the case of the shutter base plate, more parts were integrally attached to it than before, so by manufacturing these parts integrally with the shutter base plate, it is possible to obtain an extremely large cost advantage. Becomes Therefore, many ideas have been made in this regard, and many proposals have been made, including those disclosed in Japanese Utility Model Publication No. 5-14268.

On the other hand, as is well known, in this type of shutter, a shutter drive member, a member of a drive system such as a spring, a set member for setting them to a charge position, and an electromagnet for controlling the start of the drive member, A printed wiring board or the like is attached to the shutter base plate, and a locking member for locking the driving member at the charging position is also attached depending on the electromagnetic control method. Therefore, conventionally,
At least another plate member (referred to as an upper base plate, an upper plate, etc.) is attached in parallel with the shutter base plate, and most of the rotating members including the members of the drive system are located between them.
The shutter base plate is mainly attached to the shaft, and the control system parts are mainly attached to either side of the plate member. Therefore, even when the shutter base plate is made of synthetic resin as described above, the pivot member and the shaft necessary for attaching the plate member are integrally formed with the shutter base plate, but the plate member is Since it is necessary to attach the rotating member to the shaft or the like, it is usual to form the shutter base plate as a separate component.

[0004]

However, it is not so easy to integrally form a plurality of elongated shafts on a shutter base plate having a large surface area and a large volume. In particular, the shaft that pivotally supports the shutter drive member is required to have verticality as well as its shape accuracy and position accuracy. However, during molding, it is difficult for the molten material to flow into the cavity at the tip of the shaft in the mold, and the sink mark after molding may cause the shaft to tilt. Therefore, in order to integrally form the shaft as described above, a high level processing technique is required. Further, when the plate member is attached to the shutter base plate as a separate component as described above, not only the plate member but also the number of parts such as mounting screws are increased, and in addition, the mounting accuracy is required. . In particular, when an electromagnet is attached to the plate member, the alignment between the electromagnet and the driving member may become a problem. Therefore, it is required to solve these problems and reduce the manufacturing cost.

The present invention has been made to solve the above problems, and an object thereof is to provide at least one plate member having two substantially parallel plates substantially vertically between them. (EN) A low-cost focal-plane shutter integrally formed with a single support wall portion from synthetic resin so that a rotating member such as a shutter driving member can be easily attached.

[0006]

In order to achieve the above-mentioned object, a focal plane shutter for a camera according to the present invention comprises a substrate portion having an exposure opening and an upper plate arranged substantially parallel to the substrate portion. A shutter base plate integrally molded with a synthetic resin together with at least one supporting wall portion provided substantially perpendicular to the plate portions between the plate portions, and a rotary shaft integrally provided in two coaxial directions. A rotating member is formed, a bearing hole for the rotating shaft is formed in the base plate portion and the upper plate portion, and a flexible portion is formed at a position near at least one of the both bearing holes.

Further, in the focal plane shutter for a camera according to the present invention, preferably, at least one of the both bearing holes has an opening portion having a dimension narrower than a shaft diameter of the rotating shaft, and the flexible portion is It is formed on at least one side of the opening. Further, in the camera focal-plane shutter according to the present invention, preferably, a coil spring that is a force source of the rotating member is loosely fitted to one of the rotating shafts provided in the two coaxial directions, and the rotating shaft is rotated by the coil spring. The opening is formed at a position different from the approaching direction.

Further, in the focal plane shutter for a camera according to the present invention, preferably, the rotating member is a shutter driving member, and a biasing direction by a coil spring wound around a rotation shaft of the driving member and a shutter charge are provided. At this time, depending on the pressing direction of the setting member that presses the drive member, the opening portion is formed at a position different from the direction in which the drive member is moved. Further, in the focal plane shutter for a camera according to the present invention, it is preferable that a member that can come into contact with a rotation shaft of the rotating member on the opening portion side of the bearing hole is formed on the substrate portion or the upper portion. Attach it to the board.
Further, in the focal plane shutter for a camera according to the present invention, it is preferable that the rotary member and the rotary shaft thereof are integrally molded of synthetic resin.

Furthermore, in order to achieve the above object,
The focal plane shutter for a camera according to the present invention is
At least one of a substrate having an exposure opening, and a lower plate portion and an upper plate portion disposed substantially parallel to the lower plate portion are provided between the both plate portions substantially perpendicular to the both plate portions. An auxiliary member integrally formed of a synthetic resin together with two support walls, and a rotating member integrally provided with a rotating shaft coaxially in two directions, and the base plate and the upper plate are provided with the rotating shaft of the rotating shaft. Forming a bearing hole,
A flexible portion is formed at a position near at least one of the both bearing holes, and the auxiliary member is attached to the substrate.

[0010]

BEST MODE FOR CARRYING OUT THE INVENTION An embodiment of the present invention will be described with reference to an embodiment shown in FIGS. 1 to 11, and a modification of a part of the structure will be described with reference to FIG.

The focal plane shutter of the embodiment shown in FIGS. 1 to 11 is used in the initial stage of release of the camera.
First, the leading blade driving member and the trailing blade driving member are held by respective electromagnets, and after the control of the AF device and the mirror flipping operation are completed, the leading blade driving member and the trailing blade driving member are held. Is a shutter of a type in which the front blade group and the rear blade group are exposed to travel. In the front view of FIG. 1, the release of the camera is performed, and after the front blade driving member and the rear blade driving member are held by the two electromagnets, the setting member operates the both driving members by its own habit. It shows the state of retreating from the area.

2 and 3 are left side views of FIG. 1, respectively, and FIG. 3 is a partial cross-sectional view. FIG. 4 is a plan view of the shutter base plate in the embodiment and main components that are mainly assembled to the shutter base plate from the left side of the shutter base plate and are arranged so that the mounting position is easy to understand. ) Is the driving member for the leading blade and the driving member for the trailing blade, FIG. 6B shows the respective driving coil springs, FIG. 6C shows the adjusting ratchet gear of each driving coil spring, and FIG. -Each buffer member at the end of the exposure operation of the driving member for the trailing blades, and Fig. 8E shows the shutter base plate.

FIG. 5 is a plan view showing the main components assembled to the shutter base plate mainly from the right side and the upper side of the shutter base plate in an arrangement similar to that of FIG. 4 in the embodiment, and FIG. The electromagnet for the blade, the electromagnet for the rear blade and the screws for mounting them are shown in Fig. (B) the set member, (c) the biasing spring of the set member, (d) the printed wiring board, and ( e) shows a screw for mounting the printed wiring board. 6 is a left side view of the shutter base plate, FIG. 7 is a partially enlarged view thereof, and FIG. 8 is a sectional view taken along line AA of FIG. FIG. 9 is a perspective view showing the main parts of the shutter opening / closing mechanism with the printed wiring board removed, and FIG. 10 is a view from the upper right of FIG. 9 with other parts removed so that the mounting configuration of each electromagnet can be easily understood. FIG. FIG.
1 is an explanatory view of the tension position of the drive coil spring.

In FIG. 1, an exposure opening 1a formed in a synthetic resin shutter base plate 1 is closed by a group of four leading blades 2 in a developed state. At this time, the rear blade group composed of a plurality of sheets is superposed at a position above the exposure opening 1a and is in a stored state. The front blade group 2 is pivotally supported by two arms 3 and 4 rotatably attached to the shutter base plate 1 so as to form a parallelogram link mechanism. Further, although a rear blade group (not shown) is also pivotally supported in the same manner, a detailed description thereof will be omitted because the pivotal support configuration is well known, and the arms 3 and 4 for the shutter base plate 1 and the rear blades are also omitted. The mounting configuration of the two arms for the group will be described later.

As can be seen from FIGS. 4 (e), 6 and 7, the shutter base plate 1 is roughly classified into the above-mentioned exposure openings 1a.
From the four support wall portions 1d, 1e, 1f, 1g that maintain the upper plate portion 1c in parallel by providing a predetermined space between the substrate portion 1b having the above-mentioned structure, the upper plate portion 1c, and the substrate portion 1b. It is configured. In order to make the shapes of these support wall portions 1d, 1e, 1f, 1g easy to understand, a plurality of X marks are attached to these portions in FIG. The printed wiring board 5 is attached by screws 6 to two attachment portions 1h formed on the upper plate portion 1c.

Various electric wirings required for this shutter are provided on the front surface side of the printed wiring board 5, and soldering is carried out at the portions shown by hatching in FIGS. 1 and 5 (d). It shows the location. Two contact members 7 and 8 constituting a switch for flash photography are soldered to the printed wiring board 5 as shown in FIGS. 2, 3 and 5 (d), and the movable contact member 8 is The contact member 7 on the fixed side, which is arranged on the back side of the printed wiring board 5, is bent at a right angle from the front side to the back side so that the two can contact each other on the back side of the printed wiring board 5.

As shown in FIG. 4E, the shutter base plate 1
The front blade group 2 and the arm 3.4 are provided on the back side of the base plate portion 1b.
Chamfered portion 1i is formed in order to prevent the end surface of exposure opening 1a from colliding during traveling,
A thick portion 1j for pressing the front blade group 2 to the back side is formed in a U shape so that the front end portion (right end) of the sheet is not disturbed during traveling. Further, four shafts 1k are integrally formed on the back side of the board portion 1b at substantially four corners. As shown in FIGS. 2 and 3, a well-known cover plate 10 is attached by screws 9 to fix the board 1k. A blade chamber is formed between the portion and the portion 1b.

On the back side of the base plate portion 1b, as shown in FIGS. 2 and 3, the main arm 3 for the leading blade is also attached to the shaft 13a of the driving member 13 for the leading blade, which will be described in detail later. The main arm 11 for the trailing blade is rotatably attached to the shaft 14a of the driving member 14 for the trailing blade. The shafts 11 and 1m that are integrally molded on the back side of the substrate portion 1b are
The sub-arm 4 for the leading blade and the sub-arm 12 for the trailing blade are rotatably mounted respectively, and well-known backlash springs 4a, 12a are stretched on these arms 4, 12.

Next, the leading blade driving member 13 and the trailing blade driving member 14 will be described mainly with reference to FIGS. 2, 3 and 4A. These drive members 13 and 14 are made of synthetic resin, and the shafts 13a and 14a are concentrically formed integrally in two directions. Similarly, well-known drive pins 13b and 14b are formed on the drive members 13 and 14, respectively. These drive pins 13b and 14b penetrate through arc-shaped slots 1n and 1o formed in the base plate portion 1b, and are formed on the main arms 3 and 11 on the back side of the shutter base plate 1 and are not shown and are well known. It fits in the hole.

It should be noted that the lower ends of the slots 1n and 1o are shown in FIG.
Well-known cushioning member 15 made of butyl rubber as shown in (d)
Are respectively inserted (the state of being fitted in the slot 1o is shown in FIG. 9), and the drive pin 1 is
3b and 14b collide. Similarly, a buffer member 16 made of butyl rubber but having an annular shape is also used.
2 is fitted to the lower shaft 1k shown in FIGS. 2 and 3, and the main arm 3 of the front blade group 2 collides with it at the end of the exposure run.

Returning to the description of the driving members 13 and 14, rollers 13c and 14c are rotatably attached to the back surfaces of these members. Further, rising portions 13d and 13e are formed on the front surface side of the leading blade driving member 13, and rising portions 14d are formed on the front surface side of the trailing blade driving member 14. The rising portion 13d has an upper edge portion which pushes the contact member 8 to bring it into contact with the contact member 7 at the end of the exposure traveling of the front blade group 2. As is well known, the iron pieces 1 that are integral with the shafts 13f and 14e are provided on the rising portions 13e and 14d.
3g and 14f are attached, and these iron piece members 13g and 14f are urged by springs 13h and 14g (see FIG. 9) in a direction away from the rising portions 13e and 14d, as is well known.

As clearly shown in FIG. 3, the drive member 1
Steps are formed on the shafts 13a and 14a of the shafts 3 and 14 (positions to the right in FIG. 3), and ratchet gears 17 and 18 are provided between the steps and the upper plate 1c.
Are rotatably fitted together. Also, the shafts 13a and 14a
Coil springs 19 and 20 are loosely wound around the respective coils.
Then, one ends of the coil springs 19 and 20 are attached to the threads 17a and 18a formed on the ratchet gears 17 and 18,
The other ends are the rising portions 13e and 14d of the drive members 13 and 14, respectively.
It is hung on. The state of attachment of the coil springs 19 and 20 will be described in detail with reference to FIG. 11 after the operation of this embodiment is described.

The ratchet pawls 1p formed on the support walls 1d and 1e of the shutter base plate 1 are ratchet gears 1 respectively.
The ratchet gears 17, 18 are prevented from rotating by the coil springs 19, 20 by meshing with the teeth formed on the outer peripheral portions of the 7, 18. When adjusting the rotational driving force of each drive member 13, 14, rotate the ratchet gears 17, 18,
The meshing positions of the ratchet pawls 1p and the ratchet gears 17 and 18 are changed to change the strength of the coil springs 19 and 20.

Next, the structure for assembling the drive members 13 and 14 to the shutter base plate 1 will be described. As is clear from FIGS. 6 and 7, the upper plate portion 1c of the shutter base plate 1 is formed with two bearing holes 1r having substantially the same shape. Each of these bearing holes 1r is open on the left side in FIG. 7, and the size of the open portion is made slightly smaller than the diameter of the hole 1r. And one side 1r of the open part
Reference numeral ₁ denotes a flexible portion having flexibility, which allows the open portion to be spread. Further, as shown in FIG. 6, the periphery of the bearing hole 1r has an upper plate portion 1c.
It is thicker than other plate thicknesses. This thick portion is provided for reinforcement as shown by the dotted line in FIG.
It is formed up to the upper part of 1o (right side in the figure). The shafts 13a and 14a inserted into the bearing holes 1r are also inserted into the holes 5c of the printed wiring board 5.

As shown in FIG. 6, a bearing hole 1s having substantially the same shape in plan view as the bearing hole 1r is also formed in the base plate portion 1b above and below the bearing hole 1r (in the horizontal direction in FIG. 6, and in the drawing in FIG. 7). (Vertical direction) of the two are formed. Of the two, the bearing hole 1s formed at the upper position in FIG. 7 has exactly the same planar shape as the corresponding bearing hole 1r, and forms a flexible side portion having the same shape as the side portion 1r _1. However, the bearing hole 1s formed at the lower position in FIG. 7 does not have the side portion having the above-described shape. However, the peripheral portion of the bearing hole 1s formed at the lower position is formed as a moderately flexible portion so that the shaft 13a of the drive member 13 can be properly assembled as described later. The thick portion formed around each bearing hole 1s extends to the left end of the slots 1n and 1o in FIG. Further, as clearly shown in FIG. 7, a large cutout portion 1t is formed in the upper plate portion 1c, and the curved portion 1t is formed in the slot 1o of the substrate portion 1b.
o ₁ is formed.

First, the assembly of the leading blade drive system including the leading blade driving member 13 is performed by assembling the shaft 13a of the leading blade driving member 13.
The coil spring 19 is wound around the ratchet gear 17, and then the ratchet gear 17 is fitted thereto.
And ratchet gear 17. In this state, the drive pin 13b of the drive member 13 is inserted into the slot 1 from the front side of FIG.
n, and the shaft 13a is made substantially vertical to the substrate portion 1b and the upper plate portion 1c. Then, the ratchet gear 17 is pushed in the axial direction so as to slightly compress the coil spring 19, and the upper and lower portions of the shaft 13a are pushed from the left side in FIG.
Push it into r, 1s and let go.

Assembly of the rear blade drive system including the rear blade drive member 14 is carried out in substantially the same manner as the assembly of the front blade drive system. However, the upper plate portion 1c, since not provided such notch space to notch 1t, curved portion 1o ₁ to slot 1o are formed. Therefore, the drive member 14 is inclined and the drive pin 14b is inserted into the slot 1o. After the insertion of the drive pin 14b, the shaft 14a is made vertical and assembled as in the case of the drive system for the leading blade.

Next, the leading blade electromagnet 21 and the trailing blade electromagnet 22 shown in FIG. 5A will be described. Each of the electromagnets 21 and 22 has a generally U-shaped iron core 21a,
22a and coils 21b and 22b wound around a bobbin and attached to one magnetic pole of each iron core 21a and 22a. Then, the electromagnets 21 and 22 are inserted between the substrate portion 1b and the upper plate portion 1c from the upper right in FIG.
The screws 23 are screwed into the screw holes 1d ₁ and 1e ₁ of the support walls 1d and 1e.

Since FIG. 10 is a view seen from the upper right side of FIG. 7, the concrete shapes of the iron cores 21a and 22a and their mounting states can be clearly understood. As shown in FIG. 10, the support wall portion 1
Stands 1d ₂ and 1e ₂ are formed on d and 1e, respectively, and a restriction portion 1u and a wall portion 1v are formed on the upper plate portion 1c for each electromagnet 21 and 22. Each core 21a, protrusions 21a _1, 22a ₁ to 22a have been formed.

How to assemble the electromagnets 21 and 22 is as follows.
Will be described briefly. In FIG. 10, the base 1d ₂
The iron core 22a is inserted by using as a guide, and the bobbin is inserted between the restricting portion 1u and the wall portion 1v, and the protrusion 22a ₁ is inserted between the supporting wall portion 1d and the restricting portion 1u. This way the protrusion 2
Since 2a ₁ is provided and there are many guide portions, insertion work into a deep place is extremely easy, and even if the posture of the shutter base plate 1 is not changed or special vibration is given even if the hand is released in this state, The electromagnet 22 maintains its position.

In this state, the screw 23 is passed through the hole of the iron core 22a and screwed into the screw hole 1d ₁ . At the time of fastening with the screw 23, the iron core 22a receives a force of clockwise rotation in FIG. Therefore, only the iron core 2
2a tries to rotate in the same direction. However, according to the present embodiment, the iron core 22a in which the amount of movement appears the largest
10 contacts the right end of the wall 1v in FIG. 10 and is prevented from rotating to the right. Therefore, the wall portion 1v is the regulating portion 1u.
At the same time, the bobbin, that is, the coil 22b is positioned, and the iron core 22a is positioned in the rotational direction.

When the electromagnets 21 and 22 are assembled in this way, the lead wire ends of the coils 21b and 22b pass through the respective windows 1w formed in the upper plate 1c and are formed on the printed wiring board 5. It is drawn out through each of the formed windows 5a and soldered to the surface of the printed wiring board 5.

Next, a mechanism for setting the drive members 13 and 14 to the shutter charge position will be described. The set member 24 is made of synthetic resin and has a shape as shown in FIG. 5 (b), and on the front surface side, the operated portion 24a, the pressing portions 24b and 24c, which are operated by the camera body side parts, the spring It has a hook 24d, a restricting portion 24e on the back surface side, and a shaft 24f provided in the front-back direction like the shafts 13a, 14a of the drive members 13, 14. Further, FIG. 5C shows a spring 25 that gives the set member 24 left-handedness in FIG. 5B.

This setting member 2 for the shutter base plate 1
The mounting method of 4 is almost the same as that of the driving members 13 and 14. That is, as can be seen from FIG. 7, a circular hole 1x is formed in the base plate portion 1b, and a bearing hole 1y having an open side portion is formed in the upper plate portion 1c. Both side portions 1y ₁ of the bearing hole 1y are flexible portions having flexibility. Therefore, the shaft 24f on the back surface side of the setting member 24 is inserted into the hole 1x, and the shaft 24f on the front surface side is attached to the hole 1y by pushing the both side portions 1y ₁ from the lateral side. One end of the spring 25 is a spring hook 2 of the setting member 24.
4d, and the other end is hooked in the hole 5b of the printed wiring board 5 through the hole formed in the upper plate portion 1c. Then, the hole 5c of the printed wiring board 5 is attached to the shaft 24f on the front surface side.
Are fitted together. The restriction portion 24e is fitted in the hole 1z formed in the substrate portion 1b.

Next, the operation of this embodiment having the above-mentioned structure will be described mainly with reference to FIG. FIG. 9 shows FIG.
Similarly to the above, the state after the release of the camera and immediately before the running of the front blade group is shown. That is, each electromagnet 21, 22
Is energized to the coils 21b and 22b, and the iron cores 21a and 2b
2a, the iron piece members 13g and 14f of the driving members 13 and 14
Is adsorbed and held. The set member 24 is rotated counterclockwise by the spring 25, and the restricting portion 24e contacts the end surface of the hole 1z,
Has stopped. Therefore, the pressing portion 24 of the setting member 24
b and 24c are rollers 13c and 1 of the driving members 13 and 14, respectively.
4c is retracted outside the operating angle range.

After that, when a signal is emitted from the electronic circuit built into the camera and the power supply to the coil 21b of the electromagnet 21 for the leading blade is cut off, the driving member 13 for the leading blade moves to the coil spring 19.
Turn right by the power of. Thereby, the drive pin 13b
Operates the main arm 3 and the front blade group 2 covering the exposure opening 1a travels downward while opening the exposure opening 1a. When the front blade group 2 reaches the vicinity of the position where the exposure opening 1a is substantially completely opened, the rising portion 13d of the driving member 13 pushes the contact member 8 to bring it into contact with the contact member 7. Therefore, the flash is emitted. After that, the drive member 13 is stopped by the drive pin 13b coming into contact with the buffer member 15.

Subsequently, the coil 22 of the electromagnet 22 for the rear blades
When the energization to b is cut off, the trailing blade drive member 14 is rotated right by the force of the coil spring 20. As a result, the drive pin 14b actuates the main arm 11 to cause the rear blade group stored above the exposure opening 1a to travel downward and close the exposure opening 1a. Then, finally, the drive pin 14b of the drive member 14 contacts the cushioning member 15 and stops.
When performing normal shooting without flash shooting, before the front blade group 2 completely opens the exposure opening 1a,
Needless to say, the rear blade group is run.

When the photographing is completed as described above, the film is automatically wound up, and the shutter is charged in association with the film. In the charging operation, first, the setting member 24 is rotated clockwise against the spring 25. At this time, first, the pressing portion 24b is moved to the roller 13b of the driving member 13.
And then immediately after that, the pressing portion 24c comes into contact with the driving member 1
No. 4 roller 14b, and rollers 13b and 14b, respectively.
By pushing, the drive members 13 and 14 are rotated counterclockwise against the coil springs 19 and 20.

After that, the clockwise rotation of the setting member 24 is stopped by the restricting portion 24e thereof coming into contact with the end surface of the hole 1z. Therefore, the left rotation of the drive members 13 and 14 also stops, but at this time,
The iron piece members 13g and 14f slightly compress the springs 13h and 14g and surely make surface contact with the iron cores 21a and 22a. The set member 24 is held in this charging completed state, and when the release button of the camera is pressed during the next photographing, after the driving members 13 and 14 are held by the respective electromagnets 21 and 22 at the initial stage thereof. The spring 25 returns to the position shown in FIG.

In the shutter having the above structure,
As is well known, the force of the coil springs 19 and 20 is extremely large in order to increase the traveling speed of each blade group. Therefore, when the respective driving members 13 and 14 are supported by the shutter base plate 1 as described above, the coil spring 1 is mainly used at the time of shutter charging depending on how the coil springs 19 and 20 are wound.
The forces of 9, 20 are leftward in FIG. 9, that is, the shafts 13a,
14a may act strongly in the direction of removing it from the bearing holes 1r and 1s. Therefore, the more flexible the side portions of the open portions of the bearing holes 1r and 1s and the easier to assemble the drive members 13 and 14, the greater the possibility that the shafts 13a and 14a will tilt or come off during use. .

In the above-mentioned embodiment, the shafts 13a and 14a are fitted in the holes 5c of the printed wiring board 5 so that there is no problem even if such a force is applied. The winding method itself is designed so that such a force hardly acts. This point will be described with reference to FIG. 11A shows the coil spring 20, and FIG. 11E shows the coil spring 19.
These coil springs 19 and 20 are shown in the state shown in FIG. 9, that is, in the state where the shutter is charged and tensioned, and as described above, their one ends 19a and 20a are
The ratchet gears 17 and 18 are hooked on the threads 17a and 18a, and the other ends 19b and 20b are connected to the drive member 1
It is hung on the rising portions 13e and 14d of the reference numerals 3 and 14.

The other ends 19b and 20b hung on the respective driving members 13 and 14 move clockwise when the blade group runs for exposure, and stop at the dotted line position when the exposure ends. Therefore,
In this embodiment, the operating ranges are each about 75 degrees. On the other hand, the positions of the one ends 19a and 20a are set so that the ratchet gears 17 and
8 can be rotated and changed. In the case of this embodiment, the adjustment range is about 90 degrees. FIG.
In (b) and (f), one end portions 19a and 20a are shown in FIG.
11 (c) and 11 (g) are adjusted to a position of 90 degrees from the positions of (a) and (e), and FIGS. 11 (d) and 11 (h) are adjusted to a position of 45 degrees from FIGS. It shows a case where the positions are adjusted to the positions shown in FIGS.

In FIGS. 11B and 11F, the other ends 19 of the coil springs 19 and 20 are charged as the shutter is charged.
When b and 20b are moved from the dotted line position to the solid line position and tightened, the action lines of the force applied to the shafts 13a and 14a of the drive members 13 and 14 in the angular direction first act in the direction of the dotted line arrow, and move sequentially. Finally, the state becomes a solid arrow. Similarly, in the case of FIGS. 11C and 11G, and FIG.
In the cases of (d) and (h), the action lines of the forces acting on the shafts 13a and 14a of the drive members 13 and 14 in the angular direction are shown in the respective drawings. As a result, when the spring force of the coil springs 19 and 20 is adjusted in the adjustment range of 90 degrees, the angular range in which the above force acts is shown in 11 (a) and (e) as "spring deviation direction". Like

By the way, since the openings of the above-mentioned bearing holes 1r and 1s are formed over a predetermined angular range from the center of the bearing hole to the left in the figure, the "spring deviation direction" is the angular direction. Do not match and there is no overlap. Therefore, the coil springs 19 and 20 do not exert a force for pushing the shafts 13a and 14a of the drive members 13 and 14 toward the openings of the bearing holes 1r and 1s.

However, the shafts 13a of the drive members 13 and 14,
In order to prevent the force that pushes 14a toward the opening side of the bearing holes 1r and 1s from acting, the coil spring 1
It may not be enough to consider only the forces of 9 and 20. That is, as described above, the driving members 13 and 14 are rotated counterclockwise by the rollers 13c and 14c being pushed by the setting member 24, but of course at this time, a force in a predetermined angular direction acts on the shafts 13a and 14a. . Therefore, it is necessary that the angular direction does not coincide with the direction in which the opening is formed and is different. In that respect, in the above-described embodiment, as can be seen from the arrangement shown in FIG. 9, the force of the setting member 24 is substantially upward in the case of the shaft 13a, and the force of the shaft 14a.
In the case of, there is no problem because it works almost to the right.

As described above, in the above-described embodiment, the openings of the bearing holes 1r and 1s are formed at the angular position different from the direction in which the drive members 13 and 14 are pushed by the set member 24, and the coil spring 19 is provided. , 20 is formed at an angle direction position different from the pulling direction by the force, so there is no need to worry, but as described above, the shafts 13a and 14a are inserted into the holes 5c of the printed wiring board 5, I am trying to be safe. However, in some cases it may be sufficient to adopt at least one of these measures, and
Instead of the holes 5c of the printed wiring board 5, holes similar to those of the cover plate 10 may be formed, or various kinds of retaining members may be attached to the substrate unit 1.
You may make it provide in b and the upper plate part 1c.

Although the drive members 13 and 14 and the set member 24 are made of synthetic resin in the above embodiment, they may be made of metal in the present invention, and their shafts 13a are also shown. , 14a, 24f are separate members and are integrally assembled. Further, the present invention is applied not only to the mounting structure of the driving members 13 and 14 and the setting member 24 but also to all the rotating members rotatably mounted between the substrate portion 1b and the upper plate portion 1c. , It does not prevent application to only a part of such a rotating member.

Further, each bearing hole is a circular hole having no open portion, and the upper plate portion 1c is provided with flexibility such that the upper plate portion 1c is bent in a direction opposite to that of the substrate portion 1b. When attaching the moving member, the upper plate portion 1c may be bent and the shaft may be inserted into the bearing hole. Therefore, as can be seen from the bearing method of the setting member 24,
The bearing hole that is attached by the flexible portion may be provided only on one of the upper plate portion 1c and the substrate portion 1b. Further, in the above embodiment, each bearing hole 1r is a hole through which the shafts 13a and 14a pass, but it may be a blind hole.

Furthermore, in the above embodiment, the drive members 13, 14 and the set member 24 are replaced by the shutter base plate 1.
Although it is rotatably mounted between the substrate portion 1b and the upper plate portion 1c formed on the substrate 1, the substrate portion 1b, the upper plate portion 1
The present invention also includes those in which c, the supporting wall portions 1d, 1e, 1f, and 1g are manufactured as auxiliary members made of synthetic resin independent of the shutter base plate 1, and the auxiliary members are appropriately attached to the shutter base plate 1. Be done. In that case, the drive members 13, 1
The assembling of 4 etc. does not matter before or after the above attachment. Further, in the above description, the one in which the driving member is driven by the coil spring has been described, but the present invention is not limited to this, and can be applied to one driven by a motor.

Next, a modification of the above embodiment will be described.
In the above embodiment, the hole 5c formed in the printed wiring board 5 was circular, but in the modification shown in FIG. 12, it is shown as a large D-shaped hole 5c '. With such a shape, the relative positions of the three holes 5c 'are set in the left-right direction of the figure (that is, the straight line portion of the hole 5c').
Strict precision is required, but there is an advantage that the precision may be relatively loose in the vertical direction, and the manufacturing and mounting work of the printed wiring board 5 becomes much easier. In addition, this Figure 1
2 is enlarged, the shapes of the contact members 7, 8 described in the above embodiment can be more easily confirmed than in FIG. 5 (d).

Next, the modification shown in FIG. 13 will be described. This modification is the same as the drive member 13 in the above embodiment.
FIG. 13 shows a modified example of the bearing structure of 14, and FIG. 13 is shown corresponding to FIG. In the above embodiment, as is apparent from FIG. 3, the drive members 13 and 14 and the ratchet gears 17 and 18 are received by the surfaces, but in this modification, the drive members 13 and 14 are lines with very little friction. I try to receive it by contact. That is, the circumference of the bearing holes 1r and 1s is made thick, and the facing surface side of the substrate portion 1b and the upper plate portion 1c is made spherical. Therefore, the line contact is horseshoe-shaped, but when the bearing holes 1r and 1s are circular, the line contact is circular. Further, the spherical surface may be an arc surface.

Next, the support wall portion 1 in the above embodiment.
A modification of d, 1e, 1f, 1g will be described with reference to FIG. Figure (a) is a front view, and Figure (b) is B in Figure (a).
FIG. 4 is a cross-sectional view taken along line B. The shutter base plate 11 in this modification has an exposure opening 31a, and its substrate portion 31b, upper plate portion 31c, and support wall portion 31d are integrally molded of synthetic resin. Bearing holes 31e and 31f for the driving member are formed in the base plate portion 31b and the upper plate portion 31c as in the above-described embodiment.

The supporting wall portion 31d in this modification is formed as a partition wall between the opening / closing mechanism of the shutter blade group including the drive system and one side of the exposure opening 31a, as is apparent from FIG. . Moreover, the support wall portion 31d is the upper wall portion 3
1d ₁ and the lower wall portion 31d ₂ and the upper wall portion 31d ₁ prevents light from the left side from entering the exposure opening 31a in FIG. On the other hand, the lower wall portion 31d ₂ surrounds the exposure opening 31a as shown in FIG.
It is formed in a letter shape and blocks the light from each direction, and constitutes a part of the mirror box unit.

That is, in the lower wall portion 31d ₂ , shafts 32 are planted on both sides of the lower wall portion 31d ₂ , respectively, to rotatably support the frame body 33. A mirror 34 for guiding the subject light to the finder is attached to the frame body 33. Also, axis 3
2, a coil spring (not shown) is wound, as shown in FIG.
At, the frame 33 is urged to rotate right. A cam 36 is attached to the rotary shaft 35 attached to the camera body side.
Is attached, and the frame body 33 is configured to reciprocate when the cam follower 33 a is operated by the cam 36. With such a configuration, adjustment of the shutter and the mirror mechanism at the time of assembly becomes much easier than before. In addition, the support wall portion 31d
With the above configuration, it is possible to mount the front frame member on the camera body side having the lens mounting portion and the like.

[0055]

As described above, according to the present invention, the base plate portion and the upper plate portion arranged substantially in parallel with the base plate portion are integrally molded of the synthetic resin together with the support wall portion substantially vertical to both. Since the shutter base plate is manufactured by forming the bearing holes in the base plate portion and the upper plate portion and forming the flexible portion in the vicinity of at least one of the bearing holes, the rotary shaft is integrally formed in two coaxial directions. It is possible to easily attach a rotating member such as a shutter driving member provided in the above, and it is possible to obtain an extremely low-cost focal-plane shutter.

[Brief description of the drawings]

FIG. 1 is a front view of an embodiment of the present invention, showing a state after release of a camera and immediately before running of a front blade group.

FIG. 2 is a left side view of FIG.

FIG. 3 is a left side view similar to FIG. 2, but with a part shown in cross section.

4A and 4B are plan views showing the shutter base plate of the embodiment and main components that are mainly assembled to the shutter base plate from the left side of the shutter base plate. FIG. 4A is a front blade drive member and a rear blade. (B) shows the drive coil members for the front and rear blade drive members, (c) shows the ratchet gears for adjusting the spring force of the drive coil springs, and (d) shows the drive member for drive.
Shows each cushioning member of the driving member for the front and rear blades, and (e) shows the shutter base plate.

5A and 5B are plan views showing main components assembled to the shutter base plate mainly from the right side and the upper side of the shutter base plate in the embodiment, and FIG. 5A is a front blade electromagnet and a rear blade electromagnet. (B) shows the set member, (c) shows the biasing spring of the set member, (d) shows the printed wiring board, and (e) shows the printed wiring board attached. The screw for use is shown.

6 is a left side view of FIG. 4 (e).

FIG. 7 is a partially enlarged view of FIG.

FIG. 8 is a sectional view taken along line AA of FIG. 7;

FIG. 9 is a perspective view showing a main part of a shutter opening / closing mechanism with a printed wiring board removed in FIG.

FIG. 10 is a side view of the electromagnet seen from the upper right side in FIG. 9 with other parts removed in order to make the mounting configuration of the electromagnet easier to understand.

11A and 11E are views for explaining a force acting in a radial direction of an axis of each driving member by each coil spring for driving a shutter, and FIGS.
(C), (d) and FIGS. (F), (g), (h) show the case where the adjustment position of each coil spring is different.

FIG. 12 is a front view showing a modified example of the printed wiring board.

FIG. 13 is a side view of the shutter base plate showing a modified example of the bearing portion of the drive member.

14A and 14B are explanatory views showing a modified example of the support wall portion, FIG. 14A is a front view, and FIG. 14B is a sectional view taken along line BB in FIG. 14A.

[Explanation of symbols]

1, 31 Shutter base plate 1a, 31a Exposure opening 1b, 31b Substrate part 1c, 31c Upper plate part 1d, 1e, 1f, 1g, 31d Support wall part 1h Mounting part 13a, 14a, 24f, 32 Shaft 1n, 1o slot 1o ₁ Curved part 1r, 1s, 1y, 31e, 31f Bearing hole 1r ₁ , 1y ₁ Side part 1t Notch part 1v Wall part 1x, 1z, 5c, 5c 'hole 2 Leading blade group 3,11 Main arm 4,12 Sub arm 5 Printed wiring board 13 Leading blade driving member 13b, 14b Driving pin 13c, 14c Roller 13g. 14f Iron piece member 14 Rear blade drive member 17,18 Ratchet gear 19,20 Coil spring 21 Leading blade electromagnet 22 Rear blade electromagnet 24 Set member 24a Operated part 24b, 24c Pressing part 24d Spring hook 25 Spring 31d ₁ Upper wall part 31d ₂ lower wall 33 frame 34 mirror

Claims (11)

[Claims] 1. At least one of a substrate portion having an exposure opening and an upper plate portion arranged substantially parallel to the substrate portion is provided between the both plate portions substantially perpendicular to the both plate portions. A shutter base plate integrally molded with synthetic resin with two support walls,
A rotary member integrally provided with a rotary shaft in two coaxial directions, and a bearing hole for the rotary shaft is formed in the substrate portion and the upper plate portion, and a position near at least one of the both bearing holes. A focal-plane shutter for a camera, characterized in that a flexible portion is formed on the. 2. At least one of the both bearing holes has an open portion having a dimension narrower than a shaft diameter of the rotary shaft,
The focal-plane shutter for a camera according to claim 1, wherein the flexible portion is formed on at least one side portion of the opening portion. 3. The camera focal point according to claim 1, wherein a coil spring, which is a force source of the rotating member, is loosely fitted to one of the rotating shafts provided in the two coaxial directions. Plane shutter. 4. The focal plane shutter for a camera according to claim 3, wherein the opening portion is formed at a position different from a direction in which the rotating shaft is moved by the coil spring. 5. The rotating member is a shutter driving member, and a moving direction by a coil spring loosely fitted to a rotating shaft of the driving member and a pressing direction of a setting member that pushes the driving member during shutter charging. The focal plane shutter for a camera according to claim 4, wherein the opening portion is formed at a position different from a direction in which the drive member is moved. 6. A member capable of contacting a rotating shaft of the rotating member on the opening side of the bearing hole is attached to the base plate portion or the upper plate portion forming the bearing hole. The focal plane shutter for a camera according to claim 2. 7. A wall thickness of at least one of the bearing holes is made thicker, and a facing surface side of the substrate portion and the upper plate portion is a spherical surface or a circular arc surface, and the spherical surface or the circular arc surface is the rotation surface. The focal plane shutter for a camera according to any one of claims 1 to 6, wherein the focal plane shutter is capable of contacting a moving member. 8. The focal plane shutter for a camera according to claim 1, wherein the rotating member and its rotating shaft are manufactured by integral molding of synthetic resin. 9. The support wall portion is formed at least in the vicinity of the side edge of the exposure opening, and is formed so as to project from the upper plate portion in a direction opposite to the substrate portion. The focal plane shutter for a camera according to claim 1, wherein the focal plane shutter is for a camera. 10. The support wall portion is formed at least along the side of the exposure opening and in the vicinity thereof, and also serves as a part of a camera body side component.
10. The focal plane shutter for a camera according to any one of 9 to 9. 11. A substrate having an exposure opening, a lower plate portion and an upper plate portion arranged substantially parallel to the lower plate portion are substantially perpendicular to the both plate portions between the both plate portions. An auxiliary member integrally formed with synthetic resin together with at least one support wall portion provided on the rotating member, and a rotating member integrally provided with a rotating shaft in two coaxial directions, the substrate portion and the upper plate portion. A focal plane shutter for a camera, characterized in that a bearing hole for the rotary shaft is formed in the shaft, a flexible portion is formed at a position near at least one of the both bearing holes, and the auxiliary member is attached to the substrate.