JP2002196391A - Shutter for camera - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a lens shutter for a camera constituted so that two shutter blades made of synthetic resin are suitably actuated. SOLUTION: The two shutter blades 4 and 5 are made of the synthetic resin and rotatably attached to shafts 1h and 1i, and constituted so that they are simultaneously rotated in an opposite direction by the reciprocative actuation of a driving pin 3 fit in the slots 4a and 5a of the blades 4 and 5 so as to open/close an aperture part 1a. Then, circular arc shape projected lines 4b and 4c are formed along an actuation locus on the blade 4, and projected lines 5b and 5c are similarly formed on the blade 5, and the projected light 4b and 5b slide so that the projected lines 4c and 5c are made to slide at the time of performing open/close actuation. Therefore, sliding area by the projected lines is small and the sliding part is moved, so that the shutter is advantageous to speeding-up and durability in spite of the shutter blade made of the synthetic resin, and its configration is advantageous to the reduction of cost of the entire shutter.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a camera shutter called a lens shutter in which two shutter blades are simultaneously reciprocated in opposite directions to open and close a circular exposure opening.

[0002]

2. Description of the Related Art In a shutter of this type, usually two shutter blades are rotatably arranged in a blade chamber formed between two ground plates. By a common driving pin inserted into the hole, it is reciprocally rotated simultaneously in opposite directions to open and close a circular exposure opening. The shape of each shutter blade is roughly classified into two types. One is a shape in which the opening regulating edge is formed in a straight line, and the other is a shape in which the opening regulating edge is formed in a curved shape or a shape similar to "". Therefore, the latter shutter blade has a mound-shaped shape as a whole, but with such a shape, the exposure opening is opened from substantially the center thereof, so that uneven exposure unevenness is caused. In addition to the feature that it is unlikely to occur, there is also an advantage that photographing with a small aperture becomes possible by closing the shutter blade from an intermediate position without fully opening the exposure aperture. For this reason, at present, it is relatively more common to adopt the latter shape than to the former shape.

[0003] Further, in this type of shutter, since each shutter blade performs reciprocating operation during the exposure operation, when the operation is reversed from the opening operation to the closing operation, the shutter temporarily stops. Therefore, it is difficult to always obtain a high shutter speed (effective exposure time) as compared with the focal plane shutter. In recent years, the use of motors as opening / closing drive means has increased in recent years as the motorization of cameras has progressed. difficult.
Therefore, in order to increase the shutter speed in this type of shutter, how to increase the driving force of the driving means, how to reduce the weight of the shutter blades, and how to reduce the frictional resistance to the operation of the shutter blades. The issue is how to make it smaller.

[0004] First, increasing the driving force of the driving means will be described. When a spring is used as the driving means, it has been sufficiently studied so far,
It has been impossible to use a stronger spring than ever, due to the material and shape of other components.
When a motor is used as the driving means, a large and expensive motor must be used in order to increase the driving force, and this type of shutter needs to be reduced in size and cost. Would be contrary.
Further, recent cameras use many electric control parts, and are required to reduce power consumption of motors, but cannot meet such demands. Therefore, increasing the shutter speed from this viewpoint is not easy.

Next, the weight reduction of the shutter blade will be described. As is well known, in the case of this type of shutter, a stopper is provided to stop the operation of the shutter blade at the final stage of the exposure operation, and the shutter is operated immediately after the exposure opening is fully opened. A stopper is provided to stop the operation. Therefore, the impact force applied to the shutter blades at the time of their stop is very large, and there is a large influence on the durability of the shutter. For this reason, in the case of a shutter that requires relatively high-speed operation, a metal shutter blade having excellent durability must be employed. However, recently, it has become possible to manufacture shutter blades having a thickness of 0.1 mm or less with a synthetic resin at low cost, and to take appropriate measures for the strength when operation is stopped. It has become. Therefore, increasing the shutter speed from this viewpoint is promising.

Finally, the point of reducing the frictional resistance during the operation of the shutter blade will be described. In this regard, the two ground plates forming the blade chamber are made of synthetic resin, and are located at a position close to the circular opening that regulates the exposure opening and on the surface facing the blade chamber, surrounding the opening. In this case, an annular portion is formed so as to protrude toward the other main plate side, and the shutter blades are slidably contacted with each plate only with the annular portion. In addition, since it may be difficult to obtain stable operation of the shutter blades simply by providing such an annular portion, in such a case, a plurality of narrow projections may be provided on the two ground plates along the operation trajectory of the shutter blades. It is known that the ridges are formed in a circular arc shape, and the shutter blades are also in sliding contact with those ridges. Japanese Patent Application Laid-Open No. H11-133480 discloses an example in which both the annular portion and the ridge are formed on two ground plates.

However, as described above, if an annular portion or a ridge is formed on the two base plates constituting the blade chamber,
Although the frictional resistance between the shutter blades and the base plate decreases, the frictional resistance between the two shutter blades remains unchanged. Therefore, in order to further increase the speed, it is necessary to reduce the frictional resistance between the two shutter blades, and there is also known a device in which the means is provided on the main plate. However, doing so only complicates the shape of the base plate more and more, which is not preferable in terms of manufacturing. In view of such circumstances, according to the present invention, two shutter blades that are simultaneously reciprocated in opposite directions during the exposure operation are made of synthetic resin, and the frictional resistance between the shutter blades is small. The present invention relates to a camera lens shutter that can be completed.

[0008]

By the way, in order to reduce the frictional resistance generated between the shutter blades, it is necessary to devise the surface finish of the shutter blades. It is necessary to take it. In that case, there is a method of devising the shape of the base plate as described above, but if it is not so preferable for various reasons, it is a good idea to devise the shape of the shutter blade. It can be said that. From such a viewpoint, firstly, it is conceivable that at least one of the shutter blades is provided with a protruding portion having a point or a small area surface, and the other blade is slid in contact only with the protruding portion in principle. Is to do so.

However, in such a case,
During the operation of the shutter blade, its tip always comes into sliding contact with the other shutter blade. Therefore, since it is made of synthetic resin, its tip may be worn or damaged early, which may affect the operation of the shutter blade. Therefore, in such a case, it is necessary to apply a special unusual metal film to both shutter blades, which is not preferable in terms of cost reduction. Therefore, in order to alleviate such a problem as much as possible, the tip area of the above-mentioned protrusion is increased,
Although it is conceivable that the mutual sliding surfaces are hardly scratched, even in such a case, all the front end surfaces of the shutter blades are configured to always slide against the partner shutter blade during the operation of the shutter blade. As mentioned above, the above-mentioned problem has not been essentially solved, but rather, the sliding contact area during operation has been increased, and it has been reversed from the viewpoint of reducing the frictional resistance. I will.

SUMMARY OF THE INVENTION The present invention has been made to solve such a problem. It is an object of the present invention to simultaneously operate two shutter blades made of synthetic resin in opposite directions to form a circular shape. A lens shutter that opens and closes an exposure opening, has a small sliding contact area during opening and closing operations, and has a sliding contact portion that changes during operation. An object of the present invention is to provide an excellent camera shutter.

[0011]

In order to achieve the above-mentioned object, a camera shutter according to the present invention comprises a blade chamber between the two, each having a circular opening centered on the optical axis. Two base plates, and a combination in which both are rotatably attached to one of the base plates in different positions in the blade chamber and are simultaneously rotated in opposite directions by a driving means to open and close the opening. And two shutter blades made of resin, wherein each of the shutter blades is
At least one ridge slidably contacting each other at the time of opening / closing operation is integrally formed on the surface facing the opposing shutter blade so as to follow the respective operation trajectories.

In the camera shutter according to the present invention, at least one of the base plates may be provided with at least one of a plurality of shutter blades for slidingly contacting the shutter blades at the time of opening and closing along an operation locus of the shutter blades disposed on the base plate side. You may make it have one protrusion.

Further, in the camera shutter of the present invention, at least one of the shutter blades slides on a surface not facing the other shutter blade, and at the time of opening / closing operation, slides on the ground plate on the side facing the shutter blade. If the at least one ridge contacting is formed along with the operation trajectory of the shutter blade by integral molding, the processing of the base plate becomes easy.

In this case, if the ridge formed on one surface of the shutter blade and the ridge formed on the other surface are formed to be back to back, The operation of the blade is stable, and it is advantageous in forming.

[0015]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described with reference to two illustrated embodiments. 1 to 5 show a first embodiment. FIG. 1 is a plan view of the shutter in a closed state as viewed from the film surface side. FIG. 2 shows two shutter blades and a drive pin. FIG. 3 is a cross-sectional view showing the configuration in the vicinity of the connecting portion of FIG. 3 in an easy-to-understand manner, and FIG.
FIG. 4 is a perspective view showing the tip of the shutter blade, and FIG. 5 is a plan view of the fully opened state of the shutter as viewed in FIG. FIG. 6 is a sectional view of the second embodiment shown in the same manner as FIG.

First, the configuration of the first embodiment will be described. The blade chamber of the present embodiment is configured between a shutter base plate 1 and an auxiliary base plate 2 having substantially the same outer diameter and both made of synthetic resin, but in FIG. In order to make it easier to understand, the shape of the auxiliary base plate 2 arranged on the film surface side of the shutter base plate 1, that is, on the front surface side in FIG. The two base plates 1 and 2 are attached to each other, and the shutter base plate 1 is attached to the camera body. However, the illustration of the attachment configuration is omitted. In the center of the shutter base plate 1 and the auxiliary base plate 2, circular openings 1a and 2a serving as optical paths of subject light are formed. In the present embodiment, the opening 1a having a smaller diameter is formed. The exposure aperture is regulated.

On the subject side of the shutter base plate 1, that is, on the back side in FIG. 1, a moving magnet type motor of a current control type which rotates the rotor back and forth only within a predetermined angle range. Motor is installed. This motor is well known, and several types of configurations are known (for example, those described in JP-A-2000-66267 and JP-A-2000-78808). For this reason, illustration and description of the entire specific configuration will be omitted, and only the drive pin 3 provided integrally with the rotor at a portion protruding in the radial direction from the rotor made of a permanent magnet is shown in FIG. It is shown in
The drive pin 3 is inserted into the blade chamber through an elongated hole 1b formed in the shutter base plate 1, and as described later, at the time of photographing, immediately after the opening 1a is fully opened, the length of the drive pin 3 is increased. It comes into contact with the end face of the hole 1b.
That is, in FIG. 1, the upper end surface of the elongated hole 1b functions as a stopper.

Two stoppers 1c and 1d are provided on the surface of the shutter base plate 1 on the blade chamber side. An annular portion 1e surrounding the opening 1a is formed on the shutter base plate 1 so as to protrude toward the auxiliary base plate 2 side.
A ridge 1f connected to e and an independent ridge 1g are formed. The ridge 1g protrudes slightly larger than the annular portion 1e and the ridge 1f toward the auxiliary base plate 2 side. And
The protruding ridge 1f is formed in a thin arc shape along the operation locus of a shutter blade 4 described later, and the ridge 1g is provided with a shutter blade 5 described later disposed closer to the auxiliary base plate 2 than the shutter blade 4.
Are formed in a thin arc shape along the operation locus. Further, the shutter base plate 1 is provided with two shafts 1h and 1i, and their ends fit into holes 2b and 2c provided in the auxiliary base plate 2 as shown in FIG. are doing.

On the surface of the auxiliary base plate 2 on the blade chamber side, an annular portion 2d formed so as to protrude toward the shutter base plate 1 so as to surround the opening 2a, and is connected to the annular portion 2d. The provided guide strip 2e and the independently formed guide strip 2f are provided.
It projects slightly larger than the annular portion 2d and the guide strip 2e toward the shutter base plate 1. The guide strip 2e is formed in an arc shape along an operation locus of a shutter blade 5 described later, and the guide strip 2f is formed in an arc shape along an operation locus of the shutter blade 4 described later.

On the shafts 1h and 1i of the shutter base plate 1, shutter blades 4 and 5 made of synthetic resin, which are formed thin as a whole for weight reduction, are rotatably mounted. As shown in FIG. 2, the peripheral portions of the respective holes of the shutter blades 4 and 5 fitted to the shafts 1h and 1i are formed as thick portions on both surfaces by integral molding with a synthetic resin. It has a cylindrical shape. The shutter blades 4 and 5 have long holes 4a and 5a, respectively, and the drive pin 3 is fitted into both of them. As shown in FIG. 2, the peripheral portions of the long holes 4a and 5a are also formed as a thick portion by integral molding over both surfaces.
The surface on the side facing the other shutter blade is formed to be thinner than the surface on the side not facing.

The shutter blade 4 has two thin, arc-shaped projections on the surface facing the other shutter blade 5 and not covering the opening 1a, so as to follow its own operation locus. The ridges 4b and 4c are formed, and the thinnest tip portion having the largest amount of operation is formed to have the same thickness as the ridge 4c as shown in FIG. Is formed. The shutter blade 5 also has two thin and arcuate ridges 5b and 5c on its surface facing the shutter blade 4 so as to follow its own operating path.
Is formed, and the tip is formed thick like the shutter blade 4.

Since the shutter blades 4 and 5 are formed in this manner, one of the shutter blades 4 is
The surface on the side contacts the annular portion 1e of the shutter base plate 1 and the ridge 1f, the surface on the auxiliary base plate 2 side contacts the ridge 2f of the auxiliary base plate 2, and the other shutter blade 5 The surface on the side contacts the annular portion 2d and the ridge 2e of the auxiliary base plate 2, and the surface on the shutter base plate 1 side contacts the ridge 1g on the shutter base plate 1. And the shutter blades 4, 5 are
In the vicinity of the shafts 1h and 1i, the ridges 4b and 5b come into contact with each other,
In the vicinity of the tip, the ridge 4c and the ridge 5c come into contact. The cross-sectional view of FIG. 3 does not show an accurate cross-section, but shows a position below the openings 1a and 2a in FIG. 1, so that the above-described overlapping relationship can be understood. ing. Further, the shutter blades 4 and 5 of the present embodiment are used.
In the photographing, in order to start opening the opening 1a from the approximate center and close the opening 1a toward the approximate center, each opening regulating edge is formed in a curved shape, and is formed in the shape of a bead as a whole. ing.

Next, the operation of this embodiment will be described. FIG.
Indicates a closed state of the shutter. In this state, power is not supplied to a moving magnet type motor (not shown). However, as described in JP-A-2000-66267 and JP-A-2000-78808, the rotor made of the permanent magnet is given a rotational force using its own magnetic force. Thus, in FIG. 1, the drive pin 3 is urged downward.
Therefore, the shutter blade 4 is provided with a clockwise rotating force and the shutter blade 5 is provided with a counterclockwise rotating force, but the ends of the shutter blades 4 and 5 are applied to the stoppers 1c and 1d. Contact is maintained in this state.

When the release button is pressed in the state shown in FIG. 1, the moving magnet type motor (not shown) is energized in the forward direction, and the rotor is rotated in the forward direction. Therefore, the driving pin 3 is also rotated. However, since the rotation of the rotor is performed only in a predetermined angle range, the driving pin 3
It will be operated substantially upward. Therefore, the shutter blade 4 is rotated in the counterclockwise direction, and the shutter blade 5 is rotated in the clockwise direction, so that the openings 1a and 2a are opened from substantially the center by the opening regulating edges of both. Such an opening operation is performed because the shutter blades 4 and 5 are thin and lightweight, the sliding contact area between the shutter blades 4 and 5 is small, and the shutter blades 4 and 5 and the two ground plates 1 , 2 are performed at a high speed because of the small sliding contact area.

It should be noted that during the operation of the shutter blades 4 and 5, both the ridges 4b and 5b
And the ridge 4c and the ridge 5c maintain a sliding relationship with each other, but the ridge 4b and the ridge 4c are formed in an arc shape around the shaft 1h, 5b and the ridge 5c are formed in an arc shape with the axis 1i as the center, so their sliding contact area is always constant and does not change, but the sliding contact portion is moving. Therefore, the frictional resistance acting between the shutter blades 4 and 5 during operation is small and always constant, and each ridge has a sliding surface regardless of the length of the sliding surface. Since the contact time is extremely short, the high-speed operation of the shutter blades 4 and 5 is stably obtained, and the durability is excellent. In the present embodiment, two ridges are formed on each shutter blade. However, only one of the ridges may be formed. In this case, the ridges 4c and 5c may be left. Is preferred.

Thereafter, when the shutter blades 4, 5 fully open the opening 1a, the drive pin 3 comes into contact with the upper end surface of the long hole 1b and is stopped. This state is shown in FIG. However, since there is a tolerance between the end surfaces of the long holes 4a and 5a and the drive pin 3, the impact force is attenuated while repeating collision between the two at the time of contact, and eventually stops. Therefore, when the shutter blades 4 and 5 are merely thin, such an operation is performed every time photographing is performed, so that the edges of the long holes 4a and 5a are shaved and the operation of the shutter blades 4 and 5 becomes unstable. Or the shutter blades 4 and 5 may be destroyed. In the present embodiment, since the peripheral portions of the long holes 4a and 5a are formed thick as described above, such a concern is avoided. Not at all.

Immediately after the operation of the drive pin 3 is stopped, or immediately after a predetermined time has elapsed, the moving magnet type motor is energized in the opposite direction, and the rotor is rotated in the opposite direction to the above case. . For this reason, in FIG. 5, the shutter blades 4 are rotated clockwise, and the shutter blades 5 are rotated counterclockwise to close the openings 1a and 2a while maintaining the above-mentioned sliding relationship between them. Go. The closing operation is such that after the openings 1a and 2a are completely closed, the tips of the shutter blades 4 and 5
It is stopped by abutting on c and 1d. Thereafter, the state in which the power supply to the moving magnet type motor is cut off and the apparatus is ready for the next photographing is the state shown in FIG. In the present embodiment, the two stoppers 1c and 1d are provided as described above, but it is needless to say that only one of them may be used as is well known.

Incidentally, since the closing operation as described above is performed at a high speed similarly to the opening operation, the shutter blades 4, 5
A large impact force is generated when the tips of the abutment contact the stoppers 1c and 1d. Therefore, if the shutter blades 4 and 5 are simply made of a thin synthetic resin, as in the present embodiment, if the planar shape is a beveled shape and the tip is elongated, the impact force described above causes Its tip may be scraped or broken. In addition, at the time of this stop, the elongated holes 4a, 5a and the drive pin 3
A large force acts between them. However, in this embodiment, since the tip portions of the shutter blades 4 and 5 are formed thick and the peripheral portions of the long holes 4a and 5a are also formed thick, there is no such concern at all.

The thick portions formed at the tips of the shutter blades 4 and 5 are formed so that only the surface on the side of the other shutter blade is thickened.
Only the opposite side may be thick, or both sides may be thick. In the above,
Although the peripheral portions of the long holes 4a and 5a are both formed to be thick on both surfaces, they may be formed only on one of the surfaces. However, in order to make the sliding surfaces as small as possible when the shutter blades 4 and 5 operate, it is most preferable that at least one of them is as in this embodiment.

In this embodiment, the driving pins 3
However, the case where the rotor is integrated with the rotor of the moving magnet type motor has been described, but the present invention may be configured integrally with a lever that is reciprocated by the rotor, for example, and the drive source may be The present invention is not limited to the moving magnet type motor, and may be a stepping motor or a spring. In the case of the present embodiment, the driving pin 3 is connected to the slot 1b at the final stage of the opening operation.
Is brought into contact with the end face of
At least one of the shutter blades 4 and 5 may be configured to be stopped by contacting a stopper provided on the shutter base plate 1 or the auxiliary base plate 2.

Further, in the above description of the operation, the case where the shutter blades 4, 5 perform the closing operation after fully opening the opening 1a (that is, the exposure opening) has been described. The opening operation of the shutter blades 4 and 5 is stopped by bringing the drive pin 3 into contact with the aperture regulating member before the opening 1a is fully opened, and the closing operation is performed. Can be performed from the stop position. Therefore, when such an operation is performed, the aperture regulating member functions as a stopper instead of the elongated hole 1b. Further, in the case of photographing with such a small aperture, if the aperture is made too small, the shutter blades 4, 5
The light reflected at the end face of the aperture regulating edge of the above has an adverse effect on the photographing.
5 is thin, which is advantageous in that respect. However, it does not prevent the end face of the opening regulating edge from being formed obliquely as necessary.

Next, a second embodiment will be described with reference to FIG. FIG. 6 shows only a part of the configuration of the present embodiment in cross section, similarly to FIG. 3 described above. The shutter base plate 11 of the present embodiment is not formed with the annular portion 1e and the ridge 1f like the shutter base plate 1 of the first embodiment. Also,
The auxiliary base plate 12 of the first embodiment is also used for the auxiliary base plate 12 of the present embodiment.
The annular portion 2d and the ridge 2e are not formed.
The shutter blades 14 of the present embodiment include the same ridges 14a as the ridges 4c of the shutter blades 4 of the first embodiment,
An arc-shaped protrusion 14b is formed so as to be completely back-to-back with the protrusion 14a. Also, the shutter blade 15 of the present embodiment has an arc-shaped projection so as to be completely back-to-back with the projection 15a which is the same as the projection 5c of the shutter blade 5 of the first embodiment. 15b are formed. Other configurations are exactly the same as those of the first embodiment.

That is, the configuration of the present embodiment is such that the ridges 14b, 15b are formed on the shutter blades 14, 15 instead of eliminating the annular portions 1e, 2d and the ridges 1f, 2e in the first embodiment. With such a configuration, the shape of each plate having a complicated shape can be simplified, and the cost of the shutter as a whole can be reduced.
Further, the shutter blades 14 and 15 of the present embodiment are designed such that their ridges 14b and 15b are
Although the shutter blades 4a and 15a are formed back to back, the shutter blades 14 and 15 may be formed at positions different in radius from the rotation axis of the shutter blades 14 and 15. Further, in the case of the present embodiment, the formation of the ridges corresponding to the ridges 4b and 5b in the first embodiment is not prevented. In this case, the ridges are similarly formed on the opposite surface. It does not prevent forming. Further, the operation of the present embodiment is performed according to the case of the first embodiment, and the description thereof will be omitted.

In the description of the above embodiments, the case where the two base plates are made of synthetic resin has been described.
It is not limited to such a thing and may be made of metal.

[0035]

As described above, according to the present invention, the two synthetic resin shutter blades rotatably mounted at different positions with respect to the base plate simultaneously rotate in opposite directions to open and close. In the camera shutter to be performed, each of the shutter blades integrally forms an arc-shaped ridge centering on their rotation axis on their opposing surfaces, and during operation of each shutter blade, Since the ridges are brought into sliding contact with each other, the frictional resistance between the shutter blades is reduced, which is advantageous for speeding up, and the advantages in terms of shutter durability and cost are increased.

[Brief description of the drawings]

FIG. 1 is a plan view of a first embodiment in which a closed state of a shutter is viewed from a film surface side.

FIG. 2 is a cross-sectional view of the first embodiment showing a configuration near a connecting portion between two shutter blades and a driving pin for easy understanding.

FIG. 3 is a cross-sectional view of the first embodiment showing an overlapping configuration of two shutter blades and two ground plates for easy understanding.

FIG. 4 is a perspective view showing a tip portion of a shutter blade according to the first embodiment.

FIG. 5 is a plan view of the first embodiment when the shutter is fully opened as viewed in FIG.

FIG. 6 is a sectional view of the second embodiment shown in the same manner as FIG. 3;

[Explanation of symbols]

1, 11 Shutter base plate 1a, 2a Opening 1b, 4a, 5a Slot 1c, 1d Stopper 1e, 2d Annular part 1f, 1g, 2e, 2f, 4b, 4c, 5b, 5c, 1
4a, 14b, 15a, 15b Ridge 1h, 1i Axis 2, 12 Auxiliary base plate 2b, 2c Hole 3 Drive pin 4, 5, 14, 15 Shutter blade

Claims (4)

[Claims] 1. A blade chamber is formed between the two plates, each of which has a circular opening centered on an optical axis, and two base plates each having a circular opening. Two synthetic resin shutter blades that are rotatably mounted at different positions and are simultaneously rotated in opposite directions by driving means to open and close the opening, and each of the shutter blades is At least one ridge slidably contacting each other at the time of opening / closing operation is formed integrally with a surface facing the opposing shutter blade so as to follow each operation trajectory. Shutter. At least one of the base plates has at least one ridge for slidingly contacting the shutter blades at the time of opening / closing operation along an operation trajectory of the shutter blades arranged on the base plate side. The camera shutter according to claim 1, wherein: 3. At least one of the shutter blades includes:
At the time of opening / closing operation, at least one ridge slidably contacting the main plate on the side facing the other side of the shutter blade along the operation trajectory of the shutter blade. The camera shutter according to claim 1, wherein the shutter is formed by molding. 4. A ridge formed on one surface of the shutter blade and a ridge formed on the other surface are formed so as to be back to back. Item 4. A camera shutter according to item 3.