JP2017045019A - Focal plane shutter and camera - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a focal plane shutter that can conduct a smooth operation even when oil scatters or adheres.SOLUTION: A focal plane shutter is employed that comprises: a shutter base plate that includes an image frame for exposure; a plurality of arms; a plurality of shutter blades that is each attached to one end of the plurality of arms, and moves accompanied by a movement of the plurality of arms to thereby switch a state covering the image frame and a state opening the image frame; an armature that is coupled to the plurality of arms and causes the plurality of arms to move accompanied by a movement of the armature; and a yoke that is fixed to the shutter base plate, and is magnetized by energization to absorbedly hold the armature, in which an oil repellent treatment is applied on at least one of an absorption surface with the armature in the yoke, and an absorption surface with the yoke in the armature.SELECTED DRAWING: Figure 1

Description

  One embodiment of the present invention relates to a focal plane shutter for a camera including shutter blades and a camera including the focal plane shutter.

  Conventionally, a focal plane shutter used for a camera has a plurality of shutter blades, a plurality of arms each having one end in a length direction rotatably attached to a shutter base plate, and a blade dowel for connecting the arm and the shutter blades. (Connecting shaft), an iron piece portion (armature) that operates in conjunction with the arm, and an iron core portion (yoke) that attracts the iron piece portion by magnetization by energization. For example, Patent Document 1 and Patent Document 2 disclose such a focal plane shutter.

Japanese Patent Laying-Open No. 2015-121599 Japanese Patent Laid-Open No. 9-179164

  However, the conventional focal plane shutter has the following problems. First, oil applied to another part of the focal plane shutter or another structure of the camera may splash and adhere between the iron piece (armature) and the iron core (yoke). Desorption (detachment) between the iron piece part and the iron core part may not be performed smoothly. As described above, when the detachment between the iron piece portion and the iron core portion is not performed smoothly, the shutter may not operate smoothly. Second, the operation of the focal plane shutter causes the blade dowel (connection shaft) to come into contact with another structure such as an arm, and the repetition of the focal plane shutter causes dust such as metal powder to be generated from the blade dowel. there were. When dust is generated in this way, for example, dust adheres to an image sensor or a lens of a camera, and noise may be generated in the captured image.

  The present invention adopts the following means in order to solve the above problems. In the following description, in order to facilitate understanding of the invention, reference numerals and the like in the drawings are appended in parentheses, but each component of the present invention is not limited to these appendices. It should be construed broadly to the extent that contractors can technically understand.

One means of the present invention is to
A shutter base plate (11) having an image frame for exposure;
A plurality of arms (15a, 15b, 18a, 18b);
Each of the plurality of shutter blades (14a to 14d, 17a) is movably attached to one end of the plurality of arms, and switches between a state of covering and releasing the image frame by moving with the movement of the plurality of arms. ~ 17d)
An armature (4) connected to the plurality of arms and moving the plurality of arms in accordance with the movement;
A yoke (1) fixed to the shutter base plate and magnetized by energization to attract and hold the armature;
At least one of the suction surface of the yoke with the armature and the suction surface of the armature with the yoke is a focal plane shutter that is oil-repellent.

  According to the focal plane shutter having the above-described structure, both the yoke and the armature or one of the attracting surfaces are subjected to oil repellency treatment. Even if oil adheres to the attracting surface of the yoke and the armature, the yoke and the armature It is possible to smoothly perform desorption (separation). As a result, it is possible to prevent the focal plane shutter from operating smoothly due to the scattered oil.

In the focal plane shutter, preferably,
A fluorine-based coating agent is applied to at least one of the adsorption surface of the yoke with the armature and the adsorption surface of the armature with the yoke.

  According to the focal plane shutter having the above-described configuration, the oil-repellent treatment can be effectively performed on the adsorption surface of the yoke and the armature by the fluorine-based coating.

In the focal plane shutter, preferably,
The oil repellent treatment is a treatment such that the contact angle at the time of oil adhesion is 45 degrees or more.

  According to the focal plane shutter having the above-described configuration, it is possible to perform sufficient oil repellency treatment on the suction surface between the yoke and the armature.

  Any of the above focal plane shutters is preferably applied to a camera.

  According to the camera as described above, the focal plane shutter can be configured to operate smoothly even when oil is scattered in the vicinity of the yoke and the armature.

1 is an overall configuration diagram of a focal plane shutter. FIG. The enlarged view of the vicinity of the yoke of a focal plane shutter. The enlarged view of the vicinity of the armature of the focal plane shutter. The figure which shows the operation example of a focal plane shutter. The figure which shows the operation example of a focal plane shutter. The figure which shows the arm and focal blade of a focal plane shutter. The enlarged view of the blade | wing dowel part of a focal plane shutter. The figure which shows an oil-repellent state. The enlarged view of the yoke vicinity to which the oil which has not been oil-repellent-treated has adhered. FIG. 3 is an enlarged view of the vicinity of a yoke to which oil subjected to oil repellent treatment is attached. The enlarged view of the vicinity of an armature to which oil that has not been subjected to oil repellent treatment is attached. The enlarged view of the vicinity of the armature where the oil-repellent-treated oil adhered. A photograph of the vicinity of the yoke to which oil that has not been subjected to oil repellent treatment has adhered. A photograph of the vicinity of the yoke with oil-repellent oil attached. The figure which shows the operation state of the focal plane shutter which is not oil-repellent-processed and oil has not adhered. The figure which shows the operation state of the focal plane shutter which is oil-repellent-processed and the oil has not adhered. The figure which shows the operation state of the focal plane shutter to which oil adhered without being oil-repellent. The figure which shows the operation state of the focal plane shutter to which oil repellent treatment and oil adhered. The table | surface which shows the driving | running | working time of the front blade curtain on 4 conditions. The table | surface which shows the driving | running | working time of the rear blade curtain on 4 conditions. The table | surface which shows the time which a blade | wing starts running from the cancellation | release of the magnetization state of the front side on 4 conditions. The table | surface which shows the time which a blade | wing starts running from the cancellation | release of the magnetization state of the back side on 4 conditions. The table | surface which shows the movement time in the center point on 4 conditions. The table | surface which shows the movement time in the upper side measurement point on 4 conditions. The table | surface which shows the movement time in the lower side measurement point on 4 conditions. The figure which shows the generation | occurrence | production condition of the dust in the focal plane shutter before dust generation prevention measures. The figure which shows the generation | occurrence | production state of the dust in the focal plane shutter of this embodiment.

An embodiment according to the present invention will be specifically described according to the following configuration with reference to the drawings. However, the embodiment described below is merely an example of the present invention and does not limit the technical scope of the present invention. In addition, in each drawing, the same code | symbol is attached | subjected to the same component and the description may be abbreviate | omitted.
1. Embodiments (1) Configuration example of focal plane shutter (2) Effects of focal plane shutter according to the present embodiment Supplementary matter

<1. Embodiment>
The focal plane shutter according to the present embodiment is characterized in that oil repellent treatment is applied to at least one of the suction surfaces of the yoke and the armature. The focal plane shutter according to the present embodiment is further characterized in that a solid lubricant is applied to the head of a blade dowel (connection shaft) that connects the shutter blade and the arm. Hereinafter, the focal plane shutter according to the present embodiment will be specifically described with reference to the drawings.

<(1) Configuration example of focal plane shutter>
The focal plane shutter of the present embodiment is a focal plane shutter used for a digital camera or the like. Such a camera may have a configuration in which oil for lubricating the operation is applied to a mirror box, an aperture control mechanism, a mirror drive mechanism, a shutter charge mechanism, and the like. This oil may splash during operation. The scattered oil adheres to any place inside the camera, but may adhere to the yoke (iron core part) or the armature (iron piece part). As will be described in detail below, when oil adheres to the yoke or the armature, when the yoke and the armature are desorbed from the adsorbed state, the desorption speed may become slow due to the viscosity of the oil. In this way, the configuration of the present embodiment is such that the oil-repellent treatment is performed so that the desorption speed between the yoke and the armature is prevented and the desorption between the yoke and the armature is smooth.

  FIG. 1 is a diagram illustrating a configuration example of a focal plane shutter according to the present embodiment. FIG. 2 is an enlarged view of the vicinity of the yoke of the focal plane shutter according to the present embodiment. FIG. 3 is an enlarged view of the vicinity of the armature of the focal plane shutter according to the present embodiment. 4 and 5 are diagrams for explaining the operation of the shutter blades in the focal plane shutter according to the present embodiment. FIG. 6 is an extracted view of the arm and shutter blade portions of the focal plane shutter of this embodiment. FIG. 7 is an enlarged view of a cross section of a blade dowel (connection shaft) of the focal plane shutter of the present embodiment.

  As shown in FIGS. 1 to 7, the focal plane shutter of the present embodiment includes yokes 1 and 1 a, bobbins 2, terminal pins 3, armatures 4 and 4 a, drive lever 5, shutter base plate 11, auxiliary base plate 12, and opening. Part 13, blade members 14a to 14d and 17a to 17d, rear blade arms 15a and 15b, leading blade arms 18a and 18b, and blade dowels 16a to 16n and 19a to 19n. In addition to these configurations, configurations included in the conventional focal plane shutter are included, but since they are not directly related to the features of the present embodiment, description of those configurations is omitted here.

<Yoke 1>
The yoke (iron core portion) 1 (1a) constitutes an electromagnet, and is magnetized by energizing a coil wound around a bobbin 2 provided so as to cover the yoke 1 (1a). The armature 4 (4a) is configured to adsorb. The yoke 1 and the armature 4 are paired, and the yoke 1a and the armature 4a are paired. The yoke 1 and the armature 4 are configured for the rear blade, and the yoke 1a and the armature 4a are configured for the leading blade. It is. Since the relationship between the yoke 1 and the armature 4 is the same as the relationship between the yoke 1a and the armature 4a, the following description will focus on the yoke 1 and the armature 4.

  As described above, the yoke 1 attracts the armature 4 when it is magnetized by energizing the coil, and demounts the armature 4 when the energization of the coil is interrupted and the magnetized state is released. In the present embodiment, the yoke 1 and the armature 4 are configured such that their opposing surfaces come into contact with each other in the attracted state. The yoke 1 is coated with a fluorine-based coating agent (oil-proofing agent, oil-repellent agent) on the surface facing the armature 4, thereby performing oil-repellent treatment.

<Bobbin 2>
As shown in FIG. 2, the bobbin 2 is disposed so as to cover a part of the yoke 1, and a coil is formed around the bobbin 2 by a wound wiring. As described above, the coil can be energized, and the yoke functions as an electromagnet when energized.

<Terminal pin 3>
As shown in FIG. 2, the terminal pin 3 is formed so as to protrude from the bobbin 2, and the coil is energized by applying a voltage to the terminal.

<Amature 4>
The armature (iron piece portion) 4 is arranged at a position facing the yoke 1 and is attracted to the yoke 1 by magnetization on the yoke 1, thereby moving in the direction of the yoke 1. A compression spring (not shown) is attached to the armature 4 and is urged in the opposite direction to the yoke 1 by this compression spring. By the action of the compression spring, the yoke 1 is detached (separated) from the yoke 1 when not in a magnetized state. The armature 4 is coated with a fluorine-based coating agent (oil-proofing agent, oil-repellent agent) on the surface facing the yoke 1, thereby performing oil-repellent treatment.

  The armature 4 is connected to the arm 15a, and the armature 4a is connected to the arm 15b. When the armature 4 moves, the arm 15a moves together, and when the armature 4a moves, the arm 15b moves together.

<Drive lever 5>
The drive lever 5 is configured to rotatably support the armature 4.

<Shutter base plate 11>
As shown in FIGS. 1, 4 and 5, the shutter base plate 11 is formed with a rectangular opening 13. Further, the shutter base plate 11 is equipped with each element constituting a focal plane shutter. The shutter base plate 11 is mounted with the yoke 1, the bobbin 2, the terminal pin 3, the drive lever 5 and the like fixed thereto, the armature 4, the blade members 14a to 14d and 17a to 17d, and the rear blade arm 15a. 15b and leading blade arms 18a and 18b are mounted in a movable state.

<Auxiliary base plate 12>
The auxiliary base plate 12 is attached to the back side of the shutter base plate 11 by a suitable means with a predetermined distance from the shutter base plate 11. The auxiliary base plate 12 is also formed with an opening (not shown) having a shape similar to that of the opening 13.

<Opening 13>
The opening 13 is configured to be able to change between a state covered by the blade member and a released state depending on the moving state of the blade member. The opening 13 functions as an image frame for exposure.

<Vane members 14a to 14d and 17a to 17d>
As shown in FIG. 1 and FIGS. 4 to 6, the blade members 14 a to 14 d and 17 a to 17 d are configured to be able to change between a state of covering the opening 13 and a state of opening by the movement. The blade members 14a to 14d function as rear blades, and the blade members 17a to 17d function as leading blades. In the configuration shown in FIG. 1, the three blade members 14 a to 14 c constitute the rear blade, and the three blade members 17 a to 17 c constitute the leading blade. On the other hand, in the configuration shown in FIGS. 4 to 6, the four blade members 14 a to 14 d constitute the rear blade, and the four blade members 17 a to 17 d constitute the leading blade. In this way, the number of blade members constituting the rear blade or the front blade can be arbitrarily determined.

  The blade members 14a to 14d constituting the rear blade are movably supported on the rear blade arms 15a and 15b by the blade dowels 16a to 16n. Similarly, the blade members 17a to 17d constituting the leading blade are movably supported by the leading blade arms 18a and 18b by the blade dowels 19a to 19n. The blade dowels are arranged at connecting portions between the blade members and the arms.

<Rear blade arms 15a and 15b>
The rear blade arms 15a and 15b are connected to the blade members 14a to 14d constituting the rear blade by the blade dowels 16a to 16n, and are configured to move as the armature 4 moves. By moving the rear blade arms 15a and 15b, the blade members 14a to 14d connected to the rear blade arms 15a and 15b move together.

<Lead blade arms 18a and 18b>
The leading blade arms 18a and 18b are connected to the blade members 17a to 17d constituting the leading blade by the blade dowels 19a to 19n, and are configured to move as the armature 4a moves. As the leading blade arms 18a and 18b move, the blade members 17a to 17d connected to the leading blade arms 18a and 18b move together.

<Bane dowels 16a to 16n and 19a to 19n>
The blade dowels (connection shafts) 16a to 16n are shafts for connecting the rear blade arms 15a and 15b and the blade members 14a to 14d constituting the rear blade, and are configured to be rotatable. Similarly, the blade dowels (connection shafts) 19a to 19n are shafts for connecting the leading blade arms 18a and 18b and the blade members 17a to 17d constituting the leading blade, and are configured to be rotatable. .

  FIG. 7 shows a cross-sectional view near the blade dowel. Here, the blade dowels 16a to 16n and 19a to 19n are collectively referred to as the blade dowels 16, and the arms 15a, 15b, 18a, and 18b are collectively referred to as the arms 15. As shown in the drawing, the blade dowel 16 is arranged to connect the arm 15 and the blade member. The blade dowel 16 includes a head portion 21, a buttocks slope 22, a side surface portion 23, and a fitting portion 24. The head 21 is formed in a planar shape including the top of the blade dowel 16. The buttocks slope 22 forms a slope extending from the planar head 21. The side surface portion 23 is disposed at a position continuous from the flange slope 22 and forms a side surface substantially in the same direction as the direction in which the blade dowel 16 extends. The fitting portion 24 is formed in a straight line shape in substantially the same direction as the direction in which the blade dowel 16 extends, and is formed so as to fit the blade member.

  The blade dowels 16 are lubricated by being dipped (immersed) in a liquid agent having a lubricating effect in the manufacturing process. Here, the liquid agent to which the blade dowels 16 are dipped is a fluororesin having an average particle diameter of 10 μm or less (preferably 0.3 μm to 3 μm or less) and a straight chain having an average molecular weight of 10,000 or less (preferably an average molecular weight of 3000 to 8400). And a hydrofluoroether or hydrofluorocarbon having an average molecular weight of 10,000 or less (preferably a linear hydrofluoropolyether oil having an average molecular weight of 3000 to 8400). A fluorine-based solid lubricant diluted with 1 is used. However, the lubricant used to give the lubricating effect to the blade dowels 16 is not limited to the above, and other lubricants can be used.

  In addition, the lubrication process with respect to the blade dowels 16 is not limited to the method of dipping into the liquid as described above, and may be performed by a method of applying a lubricant to the head 21 and the heel slope 22. However, when the lubrication process is performed by dipping as described above, the lubrication process can be easily performed. Further, it is more preferable that an oil repellent is applied to the fitting portion 24.

  The lubrication treatment as described above causes the blade dowels to contact and interfere with other components when the blade member moves, thereby generating dust (dust) such as metal powder from the blade dowels or the contacted configuration. The purpose is to prevent. Accordingly, considering this point, a certain degree of effect can be obtained by subjecting the head 21 of the blade dowel 16 to lubrication. Furthermore, a further effect can be obtained by subjecting the head 21 and the buttocks slope 22 of the blade dowel 16 to lubrication.

  4 shows the exposure operation end state in the focal plane shutter operation, and FIG. 5 shows the set operation end state in the focal plane shutter operation. When the exposure operation is performed, energization of the leading blade yoke 1a is stopped in a state where the setting operation is completed in FIG. 5, and energization of the trailing blade yoke 1 is stopped after a predetermined time. As a result, the armature 4a is detached (separated) from the yoke 1a, and the blade members 17a to 17d constituting the leading blade are moved downward in the figure by the movement of the arms 18a and 18b accompanying the movement of the armature 4a. Thereafter, the armature 4 is detached (separated) from the yoke 1, and the blade members 14a to 14d constituting the rear blade are moved downward in the drawing by the movement of the arms 15a and 15b accompanying the movement of the armature 4. When the exposure operation ends, the focal plane shutter enters the exposure operation end state shown in FIG. In this way, the exposure operation is performed. In the focal plane shutter of the present embodiment, the blade members 14a to 14d and 17a to 17d operate between these states, and the blade members are moved to other configurations by the movement of the blade members 14a to 14d and 17a to 17d at this time. By contact and interference, dust such as metal powder is generated.

  FIG. 8 is a diagram illustrating an example of an oil (oil) 6 adhesion state in the yoke 1 and the armature 4 that have been subjected to the oil repellent treatment. When the oil 6 adheres to the oil-repellent treated portion of the yoke 1 or the armature 4 of the present embodiment, the oil 6 adheres to the oil-repellent treated portion at a contact angle θ. In this embodiment, an oil repellent process is performed such that the contact angle θ of the oil 6 is 45 degrees or more. In the experiment, it was confirmed that by performing this level of oil repellency treatment, even when oil adheres between the yoke 1 and the armature 4, the desorption operation is smooth.

  The oil repellent treatment is preferably performed on both the yoke 1 and the armature 4, but a certain degree of effect can be obtained even if performed on only one of the yoke 1 and the armature 4.

<(2) Effect of focal plane shutter of this embodiment>
In the focal plane shutter according to the present embodiment, the following effects can be obtained by adopting the above configuration. First, the oil-repellent treatment is applied to the adsorption surface of the yoke 1 and the armature 4, so that the detaching operation between the yoke 1 and the armature 4 is smooth. Second, since the blade dowel 16 is lubricated, it is difficult for dust such as metal powder to be generated. Hereinafter, these effects will be specifically described.

  As the first point, the effect of the oil repellent treatment applied to the adsorption surfaces of the yoke 1 and the armature 4 will be described with reference to FIGS.

First, FIGS. 9 to 14 show a state where oil adheres to the yoke 1 or the armature 4 when the oil repellent treatment is not performed and when it is performed.
FIG. 9 shows a state in which oil adheres to the adsorption surface of the yoke 1 facing the armature 4 where no oil repellent treatment is performed.
FIG. 10 shows a state in which oil is adhered to the adsorption surface of the yoke 1 facing the armature 4 after the oil repellent treatment (in this embodiment).
FIG. 11 shows a state in which oil adheres to the suction surface of the armature 4 facing the yoke 1 that has not been subjected to oil repellent treatment.
FIG. 12 shows a state in which oil is adhered to the suction surface of the armature 4 facing the yoke 1 after the oil repellent treatment (in this embodiment).
FIG. 13 is a photograph in which oil adheres to the adsorption surface of the yoke 1 facing the armature 4 that has not been subjected to oil repellent treatment.
FIG. 14 is a photograph in which oil adheres to the adsorption surface of the yoke 1 facing the armature 4 after the oil repellent treatment (in this embodiment).

  As shown in FIGS. 9, 11, and 13, it can be seen that when the oil repellent treatment is not performed, the oil 6 adheres and spreads on the adsorption surface of the yoke 1 or the armature 4. On the other hand, as shown in FIGS. 10, 12, and 14, when the oil repellent treatment is performed, the oil 6 is repelled on the adsorption surface of the yoke 1 or the armature 4 and adheres in a ball shape. I know that.

  As described above, the oil repellent treatment repels the oil 6 adhering to the yoke 1 or the armature 4, thereby desorbing (separating) the yoke 1 and the armor 4 having the oil 6 adhering to each adsorption surface. ), It is possible to prevent the resistance caused by the oil 6 from occurring. As a result, the operation of the blade member that operates together with the armature 4 can be made smooth.

Next, FIGS. 15 to 18 show the operation state of the focal plane shutter when the oil repellent treatment is performed and when it is not performed.
FIG. 15 shows the movement of the blades when the oil repellent treatment is not performed and no oil is attached to either the yoke 1 or the armature 4.
FIG. 16 shows the movement of the blade member when the oil repellent process (of this embodiment) is performed and no oil is attached to either the yoke 1 or the armature 4.
FIG. 17 shows the movement of the blades when the oil repellent treatment is not performed and the oil adheres to the adsorption surfaces of the yoke 1 and the armature 4.
FIG. 18 shows the movement of the blades when the oil repellent treatment (of this embodiment) is performed and the oil adheres to the adsorption surfaces of the yoke 1 and the armature 4.

  As shown in FIG. 15, even if the adsorption surface of the yoke 1 and the armature 4 is not subjected to oil repellency, the blade member moves smoothly if no oil is attached. Further, as shown in FIG. 16, even if the oil repellent process is performed on the adsorption surfaces of the yoke 1 and the armature 4, it can be understood that the oil repellent process hardly affects the movement of the blade member. On the other hand, as shown in FIG. 17, it can be seen that when oil adheres to the adsorption surfaces of the yoke 1 and the armature 4, if the oil repellent treatment is not performed, the desorption (separation) operation is delayed. On the other hand, as shown in FIG. 18, if oil-repellent treatment is applied to the adsorption surface of the yoke 1 and the armature 4, even if oil adheres to the adsorption surface of the yoke 1 and the armature 4, It can be seen that there is almost no effect on the desorption (separation) operation.

Next, FIGS. 19 to 25 are tables showing the operating time of the blades under the following four conditions. The first, second, and third shots indicate the trial order.
Pattern 1: When oil repellent treatment is not performed and no oil is attached to either the yoke 1 or the armature 4 (corresponding to FIG. 15)
Pattern 2: When oil repellent treatment (in this embodiment) is performed and no oil adheres to either the yoke 1 or the armature 4 (corresponding to FIG. 16)
Pattern 3: When oil repellent treatment is not performed and oil adheres to the adsorption surfaces of the yoke 1 and the armature 4 (corresponding to FIG. 17)
Pattern 4: When oil repellent treatment (of this embodiment) is performed and oil adheres to the adsorption surfaces of the yoke 1 and the armature 4 (corresponding to FIG. 18)

FIG. 19 shows the traveling time of the leading blade curtain.
FIG. 20 shows the travel time of the trailing blade curtain.
FIG. 21 shows the time from the release of the magnetized state on the leading blade side until the leading blade starts running.
FIG. 22 shows the time from the release of the magnetized state on the rear blade side until the rear blade starts running.
In FIG. 23, the movement time of the blade | wing in the center point as an observation point of blade | wing movement is shown.
FIG. 24 shows the moving time of the blades at the upper measurement point as the blade movement observation point.
FIG. 25 shows the moving time of the blade at the lower measurement point as the blade movement observation point.

  In these tables, in Pattern 3, particularly in FIGS. 23 to 25, since the operation is delayed with respect to Pattern 1, the adhesion of oil to the adsorption surfaces of the yoke 1 and the armature 4 causes the yoke 1 to It can be seen that there is a delay in the desorption (separation) operation of the armature 4. On the other hand, in the pattern 4, even in FIGS. 23 to 25, the operation delay with respect to the pattern 1 is small compared to the pattern 3, so even if oil adheres to the adsorption surface of the yoke 1 and the armature 4, It can be seen that by performing the oil repellent treatment, the delay caused in the operation of detaching (separating) the armature 4 from the yoke 1 can be reduced.

  As described above, in the focal plane shutter according to the present embodiment, the oil repellent treatment is performed on the suction surfaces of the yoke 1 and the armature 4, so that even if a situation where oil adheres to the suction surface occurs, the desorption operation is affected. It is possible to adopt a configuration in which a smooth detaching operation is performed without generating

  Next, as a second feature of the present embodiment, the effect of the lubrication treatment applied to the blade dowel will be described with reference to FIGS. 26 and 27. FIG.

  FIG. 26 is a diagram illustrating a dust generation state in a focal plane shutter that is not subjected to a blade dowel lubrication process for dust generation prevention. FIG. 27 is a diagram illustrating a dust generation state in the focal plane shutter that is performing the blade dowel lubrication process for preventing dust generation (of the present embodiment). In FIGS. 26 and 27, the horizontal axis represents the number of endurance times (the number of blade movement operations), and the vertical axis represents the number of dust (dust) generated.

  As can be seen from a comparison between FIG. 26 and FIG. 27, in the focal store shutter that has been subjected to the blade dowel lubrication process, the amount of dust generated is reduced even if the number of endurance cycles (number of blade movement operations) increases. It is suppressed. As described above, in the focal plane shutter according to the present embodiment, it is possible to suppress the generation of dust such as metal powder due to contact (interference) of the blade dowel with other components by performing the lubrication process on the blade dowel. It has become.

  Note that the focal plane shutter according to the present embodiment includes two characteristic configurations roughly divided as described above, but these configurations can function independently of each other. Of course, it is possible to provide both of these characteristic configurations, and in this case, it is possible to provide a configuration that exhibits the effects obtained by both features.

<2. Supplementary items>
The specific description of the embodiment of the present invention has been given above. The above description is merely an embodiment, and the scope of the present invention is not limited to this embodiment, but should be broadly interpreted to the extent that a person skilled in the art can grasp.

  In the above embodiment, the example in which the oil repellent process is performed on both the yoke 1 and the armature 4 has been mainly described. However, the oil repellent process may be performed on only one of the yokes 1 and the armature 4, and even in this case, a certain effect can be achieved. be able to. However, it is more effective and preferable to perform oil repellent treatment on both the yoke 1 and the armature 4.

  Moreover, in the said embodiment, although the structure which the yoke 1 and the armature 4 contact at the time of adsorption | suction is mentioned as a specific example, it is a structure that a some clearance gap generate | occur | produces between the yoke 1 and the armature 4. The same effect can be obtained.

  In the above-described embodiment, the focal plane shutter having two curtains of the leading blade curtain and the trailing blade curtain has been described. However, the same characteristic configuration can be adopted in the focal plane shutter having a single curtain configuration.

  The present invention is suitably applied as a focal plane shutter for a camera.

DESCRIPTION OF SYMBOLS 1, 1a ... Yoke 2 ... Bobbin 3 ... Terminal pin 4, 4a ... Armature 5 ... Drive lever 6 ... Oil 11 ... Shutter base plate 12 ... Auxiliary base plate 13 ... Openings 14a-14d, 17a-17d ... Blade members 15a, 15a ... Rear blade arms 18a, 18b ... Lead blade arms 16, 16a-16n, 19a-19n ... Blade dowels

Claims (4)

A shutter base plate having an image frame for exposure;
Multiple arms,
A plurality of shutter blades each movably attached to one end of the plurality of arms, and switching between a state of covering and releasing the image frame by moving with the movement of the plurality of arms;
An armature connected to the plurality of arms and moving the plurality of arms in accordance with the movement;
A yoke fixed to the shutter base plate and magnetized by energization to attract and hold the armature,
An oil repellent treatment is performed on at least one of the suction surface of the yoke with the armature and the suction surface of the armature with the yoke. The focal plane shutter according to claim 1, wherein a fluorine-based coating agent is applied to at least one of a suction surface of the yoke with the armature and a suction surface of the armature with the yoke. The focal plane shutter according to claim 1, wherein the oil repellent treatment is a treatment such that a contact angle at the time of oil adhesion is 45 degrees or more.   A camera comprising the focal plane shutter according to any one of claims 1 to 3.