JP4939061B2 - Shutter device and camera - Google Patents

Description

  The present invention relates to a shutter device having a light shielding member and a camera.

  As a conventional electromagnetic shutter device for a camera, a release magnet type shutter device in which a shutter blade driving mechanism is directly held by a magnet has been put into practical use.

  FIG. 7 shows a drive mechanism of this type of conventional shutter device. FIG. 7 is a plan view showing a state in which the driving mechanism of the front shutter blade is directly held by the magnet, and shows a state where the driving start position holding state is shifted from the overcharge state which is the driving start preparation state. Yes. Since the driving mechanism of the rear curtain shutter blade has the same configuration, its description is omitted.

  The front curtain drive lever 30 is biased clockwise by the front curtain shutter blade traveling force about the rotation shaft 30b. An armature support member 30 a is fixed to the front curtain drive lever 30. An armature shaft 31a attached so as to be integrated with the front curtain armature 31 is loosely inserted into a through hole (not shown) formed in the armature support member 30a. At one end of the armature shaft 31a, a flange portion 31b having an outer shape larger than the inner diameter of the through hole is provided. A compression spring 31c wound around the armature shaft 31a is disposed between the leading armature 31 and the armature support member 30a. The compression spring 31c applies a biasing force in a direction that separates the leading curtain armature 31 from the armature support member 30a. An impact absorbing rubber 31d is disposed between the armature support member 30a and the flange portion 31b so as to absorb an impact when the armature support member 30a hits the flange portion 31b when shifting from the overcharge state to the running start state. ing. The yoke 32 and the coil 33 constitute an electromagnetic magnet. When the coil 33 is energized (a voltage is applied), a magnetic force is generated in the yoke 32 to attract the leading curtain armature 31.

  Normally, when the camera is in the standby state, the coil 33 is not energized, and the armature support member 30a and the shock absorbing rubber 31d are mechanically held with a gap therebetween, that is, held in an overcharged state. Yes. When the coil 33 is energized with the release operation of the camera, the mechanical release is performed and the front curtain drive lever 30 starts to run in the running direction, and the armature support member 30a has a shock absorbing rubber as shown in FIG. Collides with 31d. At this time, the armature support member 30a is held by the flange portion 31b of the front curtain armature 31 adsorbed by the yoke 32, and waits in a state where the travel start position is held. Further, the armature support member 30a and the shock absorbing rubber 31d are in parallel contact with each other so that the impact force of the front curtain armature 31 is in the direction perpendicular to the yoke 32 (arrow F). When the exposure time set in this state is reached, energization of the coil 33 is stopped, the front curtain drive lever 30 travels, the shutter blades travel, and exposure is started.

  In the above conventional example, the suction force between the yoke 32 and the leading curtain armature 31 is strong against the peeling force in the direction perpendicular to the suction surface, but the contact failure between the members due to the inclination of the member (hereinafter referred to as “collision”). It is weak to the peeling force in the rotation direction. Hereinafter, points that are weak against the peeling-off force in the rotational direction due to twisting will be described with reference to FIG.

  As shown in FIG. 8, the armature support member 30 a and the shock absorbing rubber 31 d are not in contact with each other in parallel, but are inclined so as to contact at a position farthest from the rotation center of the front curtain drive lever 30 due to manufacturing errors of parts. Suppose that In this case, an impact force in the direction of arrow A is generated on the flange portion 31b of the front curtain armature 31, and the suction surface between the yoke 32 and the front curtain armature 31 is rotated in the direction of arrow B in the direction of arrow B about e as the rotation center. Peeling force is generated. For this reason, the suction force is greatly reduced, the front curtain and rear curtain drive levers cannot be held, the blade group travels in the travel start position held state, and is not exposed, or the exposure time is significantly exceeded. The problem was occurring. Even if the front curtain and rear curtain drive levers can be held, the holding force varies. For this reason, when the energization of the coil 33 is stopped, the time required for the leading curtain armature 31 to leave the yoke 32 varies, and as a result, the exposure time varies.

As a technique to improve the above disadvantages,
(1) The armature support member 30a and the leading curtain armature 31 are positioned and fixed with an elastic adhesive such as silicon bond.
(2) As disclosed in Japanese Patent No. 3554098 (Patent Document 1), the armature is inclined and held with respect to the drive lever.
There is something like this.
Japanese Patent No. 3554098

  However, in the configuration (1), it is necessary to energize the electromagnetic magnet and bond the armature support member 30a and the armature 31 in a state where they are adsorbed. Therefore, workability was poor. Further, in the configuration (2), since the angle to be tilted is not constant due to variations in parts, it is difficult to set an optimum tilt angle. That is, there was a difficulty in assembly workability.

(Object of invention)
SUMMARY OF THE INVENTION An object of the present invention is to provide a shutter device and a camera capable of ensuring proper exposure performance and improving assembly workability even if there is a manufacturing error of parts.

To achieve the above object, the present invention is, by the biasing force of the spring member, a light blocking member, a driving member for moving the open state from the state where the shielding an opening for the light beam passage, said driving member An armature support member provided; an armature supported by the armature support member ; an electromagnetic means for attracting the armature and holding the drive member at a travel start position; and a drive start preparation state from a travel completion state to the drive member wherein the shutter device having a Ruchi Yaji member is moved against the biasing force of the spring member, said charging member, by contact with the drive member, overcharging the driving member from the travel completion state to A lift portion that moves to a state, an overcharge portion that holds the drive member in the overcharge state, the armature support member and the front Is formed adhesive portion for holding the drive member in a position to bond the armature, the adhesive portion, the said armature electromagnetic means and said Rukoto is uniform lift amount to be abutted against the formation .

  According to the present invention, it is possible to provide a shutter device or a camera capable of ensuring proper exposure performance and improving assembly workability even if there is a manufacturing error of parts.

  The best mode for carrying out the present invention is as shown in the following examples.

  FIG. 1 is a front view of a longitudinally running focal plane shutter device according to the present invention, showing a state before the start of shutter travel.

  In FIG. 1, reference numeral 1 denotes a shutter base plate in which an aperture 1a which is an opening is formed. A front curtain drive lever 2 is rotatably supported on a front curtain shaft 1b provided on the surface of the shutter base plate 1. A front curtain drive pin (not shown) formed on the back side of the front end portion of the front curtain drive lever 2 passes through an arc-shaped groove 1c formed in the shutter base plate 1 with the front curtain shaft 1b as a center, and the back surface of the shutter base plate 1 Is engaged with a front curtain drive arm (not shown). The forward and backward movement of the front curtain drive lever 2 is restricted by the arc-shaped groove 1c. Within the rotation range of the front curtain drive lever 2, the front curtain blade group 2a connected to the front curtain drive arm by the link mechanism is operated to cause the aperture 1a to travel from the fully closed state to the fully open state.

  An armature support member 2 b is fixed to the surface of the front curtain drive lever 2. An armature shaft 3a attached so as to be integrated with the front curtain armature 3 is loosely inserted into a through hole (not shown) formed in the armature support member 2b. At one end of the armature shaft 3a, a flange portion 3b having an outer shape larger than the inner diameter of the through hole is provided.

  A compression spring 4 is disposed around the armature shaft 3a between the front curtain armature 3 and the armature support member 2b. The compression spring 4 applies a biasing force in a direction that separates the leading curtain armature 3 from the armature support member 2b. A space between the front curtain armature 3 and the armature support member 2b is fixed by an elastic adhesive 21 such as silicon. In addition, the adhesion location of the front curtain armature 3 and the armature support member 2b is not limited to the illustrated position, and may be another location.

  A torsion spring (not shown) is disposed around the front curtain shaft 1b, and the torsion spring applies a biasing force to the front curtain drive lever 2 in the traveling direction (clockwise direction).

  Reference numeral 5 denotes a shock absorbing rubber which is a shock absorbing member, and is disposed between the armature support member 2b and the flange portion 3b. The armature support member 2b when shifting from the overcharge state to the travel start position holding state absorbs an impact when the armature support member 2b hits the flange portion 3b. Reference numerals 6 and 7 denote a front curtain yoke and a front curtain coil. When a voltage is applied to the front curtain coil 7, a magnetic force is generated in the front curtain yoke 6, and the front curtain armature 3 is sucked and held on the suction surface of the front curtain yoke 6. An electromagnetic means is configured. Reference numeral 8 denotes a screw for stopping the electromagnetic means.

  A charge lever 9 having a trifurcated shape is rotatably supported by a charge lever shaft 1c provided on the surface of the shutter base plate 1, and charges the charge pin 9a clockwise by a camera side charge member (not shown). To do. When the charge lever 9 is charged clockwise, the front curtain drive lever charge roller 22 provided on the back side of the front curtain drive lever 2 is charged by the tips of the cam portions 9b and 9c (FIG. 2). At the same time, the rear curtain drive lever charge roller 23 provided on the back side of the rear curtain drive lever 10 (described later) is also charged. Then, the front curtain drive lever 2 and the rear curtain drive lever 10 are charged and held until they are overcharged, and when the front curtain drive lever 2 and the rear curtain drive lever 10 are bonded to an armature and an armature holding member described later. Hold in position.

  A rear curtain drive lever 10 is rotatably supported on a rear curtain shaft 1d provided on the surface of the shutter base plate 1. A rear curtain drive pin (not shown) formed on the back side of the front end of the rear curtain drive lever 10 passes through an arc-shaped groove 1e formed in the shutter base plate 1 with the rear curtain shaft 1d as the center, and the shutter base plate 1 Is engaged with a rear curtain drive arm (not shown). The rotation range of the rear curtain drive lever 10 is restricted by the arcuate groove 1e. Then, a trailing blade group (not shown) waiting on the upper portion outside the aperture 1a, which is connected to the trailing blade driving arm and the link mechanism within the rotation range of the trailing blade driving lever 10, is operated. 1a is run from a fully open state to a fully closed state.

  11 is a trailing curtain armature. An armature support member 10 b is fixed to the surface of the rear curtain drive lever 10. An armature shaft 11a attached so as to be integrated with the rear curtain armature 11 is loosely inserted into a through hole (not shown) formed in the armature support member 10b. One end of the armature shaft 11a is provided with a flange portion 11b whose outer shape is larger than the inner diameter of the through hole. Further, a compression spring 12 is disposed around the armature shaft 11a between the rear curtain armature 11 and the armature support member 10b. The compression spring 12 applies a biasing force in a direction that separates the trailing curtain armature 11 from the armature support member 10b.

  A space between the rear curtain armature 11 and the armature support member 10b is fixed by an elastic adhesive 24 such as silicon. In addition, the adhesion location of the rear curtain armature 11 and the armature support member 10b is not limited to the position shown in the figure, and may be another location.

  A torsion spring (not shown) is disposed around the rear curtain shaft 1d, and the torsion spring applies a biasing force to the rear curtain drive lever 10 in the traveling direction (clockwise).

  Reference numeral 13 denotes a shock absorbing rubber, which is disposed between the armature support member 10b and the flange portion 11b. The armature support member 10b when shifting from the overcharge state to the travel start state absorbs an impact when the armature support member 10b hits the flange portion 11b. 14 and 15 are a rear-curtain yoke and a rear-curtain coil, and when the rear-curtain coil 15 is energized, a magnetic force is generated in the rear-curtain yoke 14, and an electromagnetic that attracts and holds the rear-curtain armature 11 on the attracting surface of the rear-curtain yoke 14. A magnet is constructed. Reference numeral 16 denotes a screw for stopping the electromagnetic magnet.

  Next, how to bond the armatures 3 and 11 and the armature support members 2b and 10b in the above configuration will be described.

  FIG. 2 is a partial view of the shutter device as seen from the back. A front curtain drive lever charge roller 22 is provided on the back side of the front curtain drive lever 2, and a rear curtain drive lever charge roller 23 is provided on the back side of the rear curtain drive lever 10. The cam portion 9b of the charge lever 9 is provided with a lift portion 9d for charging the front curtain drive lever 2 and an overcharge portion 9e for holding the front curtain drive lever 2 in an overcharged state. Further, an adhesion portion 9f that holds the front curtain drive lever 2 at a position where the front curtain armature 3 and the armature support member 2b are adhered is provided. The cam portion 9c is provided with a lift portion 9g for charging the rear curtain drive lever 10 and an overcharge portion 9h for holding the rear curtain drive lever 10 in an overcharged state. Further, an adhesive portion 9i that holds the rear curtain drive lever 10 at a position where the rear curtain armature 11 and the armature support member 10b are adhered is provided.

  FIG. 3 is a diagram showing the relationship between the phase of the charge lever 9 and the lift amount of the cam portions 9b and 9c (the amount of movement against the urging force of the torsion spring). In this figure, the vertical axis represents the cam lift amount, and the horizontal axis represents the rotation angle of the charge lever 9.

  The adhesion portions 9f and 9i are provided after the overcharge portions 9e and 9h, respectively, and the lift amount thereof is smaller than that of the overcharge portions 9e and 9h. The lift amount in 9i is uniform. That is, the charge lever 9 is rotated to bring the front curtain drive lever 2 and the rear curtain drive lever 10 into an overcharge state, and then the charge lever 9 is further rotated in the same direction so that the front curtain drive lever 2 and the rear curtain drive lever are rotated. 10 can be held by the bonding portion.

  In FIG. 2, the charge lever 9 is positioned in the adhesion phase, the front curtain drive lever charge roller 22 is in contact with the adhesion portion 9f, and the front curtain drive lever 2 is a position where the front curtain armature 3 and the armature support member 2b are adhered. Is held in. The rear curtain drive lever charge roller 23 is in contact with the bonding portion 9i, and the rear curtain drive lever 10 is held at a position where the rear curtain armature 11 and the armature support member 10b are bonded. Since the lift amounts at the bonding portions 9f and 9i are uniform, the front curtain drive lever 2 and the rear curtain drive lever 10 receive a rotational force counterclockwise in FIG. 2 by a torsion spring (not shown). The charge lever 9 can maintain the position shown in the figure without rotating.

  FIG. 4 is a front view at the time of bonding. At the time of bonding, the front curtain drive lever 2 and the rear curtain drive lever 10 are in contact with the suction surface of the front curtain yoke 6 before the start of shutter travel shown in FIG. The rear armature 11 is held in contact with the surface by the charge lever 9. At this time, the armature support members 2b and 10b are in contact with the shock absorbing rubbers 5 and 13 as in the case where the armature support members 2b and 10b are held at the travel start position. In this state, the front curtain armature 3 and the armature support member 2b, and the rear curtain armature 11 and the armature support member 10b are fixed by elastic adhesives 21 and 24 such as silicon.

  Due to the above-described configuration, the front curtain armature 3 is placed on the suction surface of the front curtain yoke 6 and the rear curtain yoke 14 is placed on the rear surface without energizing the front curtain coil 7 and the rear curtain coil 15. The curtain armature 11 can be held in contact with each other. Therefore, workability at the time of bonding is greatly improved.

  Next, the operation from the shutter charge start state to the travel completion state in the above configuration will be described with reference to FIG. 1, FIG. 5, and FIG. 5 is a rear view at the time of charging, and FIG. 6 is a rear view at the time of overcharging.

  The charge pin 9a is pushed by a camera-side charge member (not shown), and the charge lever 9 rotates counterclockwise (in FIG. 5). Then, as shown in FIG. 5, the lift portions 9d and 9g at the tips of the cam portions 9b and 9c are the front curtain drive lever charge roller 22 and the rear curtain drive lever charge on the back side of the front curtain drive lever 2 and the rear curtain drive lever 10, respectively. Press roller 23. As a result, the front curtain drive lever 2 and the rear curtain drive lever 10 are charged clockwise.

  When the front curtain drive lever 2 is charged clockwise in FIG. 5 (counterclockwise in FIG. 1), the front curtain armature 3, the compression spring 4, and the shock absorbing rubber 5 loosely inserted into the armature support member 2b. Operates simultaneously. Then, the front curtain armature 3 comes into contact with the waiting front curtain yoke 6 and stops. Similarly, when the rear curtain drive lever 10 is charged clockwise in FIG. 5 (counterclockwise in FIG. 1), the rear curtain armature 11, the compression spring 12, and the shock absorbing rubber that are loosely inserted into the armature support member 10b. 13 operates simultaneously. Then, the trailing curtain armature 11 comes into contact with the waiting trailing curtain 15 and stops. However, the front curtain drive lever 2 and the rear curtain drive lever 10 are further charged, and the armature support members 2b and 10b are separated from the shock absorbing rubbers 5 and 13 and compress the compression springs 4 and 12. Then, the front curtain armature 3 and the rear curtain armature 11 are pressed against the front curtain yoke 6 and the rear curtain yoke 15 by the spring force of the compression springs 4 and 12. Then, as shown in FIG. 6, when the front curtain drive lever charge roller 22 and the rear curtain drive lever charge roller 23 reach the overcharge portions 9e and 9h of the cam portions 9b and 9c, the charging on the camera side ends. As a result, the battery is held in the overcharge state, and enters a standby state.

  Next, it is assumed that the release operation of the camera is performed. Then, energization of the front curtain coil 7 and the rear curtain coil 15 is performed, and an attractive force is generated in the front curtain yoke 6 and the rear curtain yoke 14 so that the front curtain armature 3 and the rear curtain armature 11 are attracted. At the same time, the camera-side charge member is returned, the charge pin 9a is operated counterclockwise, and the charge lever 9 is returned. Further, the cam portions 9b and 9c are disengaged from the charge rollers 22 and 23 of the front curtain drive lever 2 and the rear curtain drive lever 10, and the front curtain drive lever 2 and the rear curtain drive lever 10 are released from the charged state. And it is urged | biased by the torsion spring by each torsion spring, and driving | running | working is started. However, the armature support members 2b and 10b travel by the impact absorbing rubbers 5 and 13 provided at the rear ends of the front curtain armature 3 and the rear curtain armature 11 that are attracted to the front curtain yoke 6 and the rear curtain yoke 14. It is held at the stopped travel start position.

  The energization of the front curtain coil 7 and the rear curtain coil 15 is sequentially stopped so that the exposure time set from that state is reached. As a result, the suction of the front curtain armature 3 and the rear curtain armature 11 attracted to the front curtain yoke 6 and the rear curtain yoke 14 is sequentially released, and the front curtain drive lever 2 and the rear curtain drive lever 10 start running. Then, exposure is performed.

  By the way, when shifting from the overcharge state to the travel start position holding state, a very large torsion spring force for generating the curtain speed is generated in the front curtain drive lever 2 and the rear curtain drive lever 10. The combined force of the spring force and the hammer effect is generated in the impact absorbing rubbers 5 and 13 via the armature support members 2b and 10b. The front-curtain yoke 6 and the rear-curtain yoke 14, the front-curtain armature 3, and the rear-curtain armature 11 generate and hold an attracting force that does not lose this force. However, when the contact surfaces of the armature support members 2b and 10b and the shock absorbing rubbers 5 and 13 are inclined due to manufacturing errors of parts, the suction surfaces of the front curtain armature 3 and the rear curtain armature 11 as described above. In addition, a peeling force in the rotational direction due to the twisting is generated. Therefore, the attraction force is reduced, and the blade group may travel without being able to hold the front curtain drive lever 2 and the rear curtain drive lever 10.

  Therefore, in the present embodiment, the front curtain armature 3 and the armature support member 2b, and the rear curtain armature 11 and the armature support member 10b are fixed with an elastic adhesive such as silicon in the adsorbed state. For this reason, the peeling force in the rotational direction due to twisting does not occur between them, and the holding force is stabilized. Therefore, it is possible to reliably prevent a serious accident such that the blade group travels before the shutter travel starts and the exposure cannot be performed or the exposure time is significantly exceeded.

  Further, the charge lever 9 can hold the front curtain armature 3 and the armature support member 2b (front curtain drive lever 2) and the rear curtain armature 11 and the armature support member 10b (rear curtain drive lever 10) in close contact with each other. It has a configuration. In this state, the front curtain armature 3 and the armature support member 2b (front curtain drive lever 2) and the rear curtain armature 11 and the armature support member 10b (rear curtain drive lever 10) are made of an elastic adhesive 21, such as silicon. 24 is fixed.

  Therefore, even if there is a manufacturing error of parts, the front curtain and rear curtain drive levers 2 and 10 cannot be held, and the front curtain and rear curtain blade group travels in the travel start position held state, and exposure cannot be performed, or This eliminates the problem that the exposure time is significantly exceeded. Therefore, it is possible to stabilize the force that holds the front curtain and rear curtain drive levers 2 and 10 in the travel start position holding state, and it is possible to provide a shutter device that does not vary in exposure time without impairing assembly workability. . That is, even if there is a manufacturing error of parts, it is possible to provide a shutter device that guarantees proper exposure performance and has good assembly workability. In this embodiment, the release magnet type shutter device including the first and second light shielding members has been described as an example. However, the present invention is not limited to this. For example, only one of the first and second light shielding members may be provided and used in combination with an electronic shutter function of an image sensor such as a CCD or CMOS sensor. According to this configuration, only one drive lever, armature, and electromagnetic means are required.

1 is a front view showing a longitudinal traveling focal plane shutter device according to an embodiment of the present invention. FIG. It is a rear view which shows the state at the time of adhesion | attachment of the shutter apparatus of FIG. It is the figure which showed the relationship between the phase of the charge lever 9 with which the shutter apparatus of FIG. 1 is equipped, and the lift amount of the cam parts 9b and 9c. It is a front view which shows the state at the time of adhesion | attachment of the shutter apparatus of FIG. It is a rear view which shows the charge state of the shutter apparatus of FIG. It is a rear view which shows an overcharge state in the shutter apparatus of FIG. It is a figure for demonstrating the shutter apparatus of a prior art example. It is a figure for demonstrating the shutter apparatus of a prior art example similarly.

Explanation of symbols

1 shutter base plate 2 front curtain drive lever (first drive member)
2b Armature support member (first armature support member)
3 First curtain armature (first armature)
4 Compression spring 5 Shock absorbing rubber 6 Front curtain yoke (electromagnetic means)
7 Front curtain coil (electromagnetic means)
9 Charge lever (charge member)
10 Rear curtain drive lever (second drive member)
10b Armature support member (second armature support member)
11 Rear curtain armature (second armature)
12 Compression spring 13 Shock absorbing rubber 14 Front curtain yoke (electromagnetic means)
15 Front curtain coil (electromagnetic means)
21, 24 Elastic adhesive

Claims (2)

A drive member that moves the light shielding member from the state where the light beam passage opening is shielded to the open state by the biasing force of the spring member;
An armature support member provided on the drive member ;
An armature supported by the armature support member ;
Electromagnetic means for adsorbing the armature and holding the drive member at a travel start position;
And Ruchi Yaji member is moved against the biasing force of the spring member to the travel start ready state the driving member from the travel completion state,
In a shutter device having
The charge member includes a lift unit that moves the drive member from a travel completion state to an overcharge state by contacting the drive member, an overcharge unit that holds the drive member in the overcharge state, and the armature support An adhesive portion for holding the driving member is formed at a position where the member and the armature are bonded,
The adhesive part is a shutter device wherein said armature electromagnetic means and said Rukoto uniform lift amount becomes contact with state is formed. A camera comprising the shutter device according to claim 1,
When the drive member is moved from the travel completion state to the overcharge state, the charge member is rotated in the first direction until the drive member is in contact with the overcharge portion, and the charge member is charged according to a release operation. A camera comprising: drive means for rotating a member in a direction opposite to the first direction .

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