JP2006153988A - Focal plane shutter device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a focal plane shutter device reducing power consumption at the time of low speed shutter release, a bulb time use, mirror-up use, etc. <P>SOLUTION: The focal plane shutter device 1 includes: a first shutter curtain 2; a second shutter curtain 3; a first shutter curtain drive means 4 for driving the first shutter curtain 2; a second shutter curtain drive means 5 for driving the second shutter curtain 3; and a shutter mount plate 6 having an aperture 7 made in it in order to define a photographic image plane. The first shutter curtain drive means 4 has a first shutter curtain drive motor 41, and a second shutter curtain drive means 5 has a second shutter curtain drive motor 51. At first, the first shutter curtain drive motor 41 starts and the first shutter curtain 2 runs. Subsequently, the second shutter curtain drive motor 51 starts and the second shutter curtain 3 runs. Exposure is carried out thereby. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a focal plane shutter device.

  In the conventional focal plane shutter device, the first shutter curtain and the second shutter curtain are respectively driven by the urging force of the spring, and the first shutter curtain and the second shutter curtain perform a parallel link motion to form a slit.

  In this conventional focal plane shutter device, the first shutter curtain and the second shutter curtain are moved against the biasing force of the spring, and the first shutter curtain and the second shutter curtain are biased by the spring. Then, the demagnetization type electromagnet as the holding member is energized, and the first shutter curtain and the second shutter curtain are attracted to each electromagnet. As a result, the driving force of the first shutter curtain and the second shutter curtain is accumulated. Then, the electromagnet corresponding to the first shutter curtain is de-energized in response to the user's release switch operation, the first shutter curtain is released from the attractive force of the electromagnet and is driven by the biasing force of the spring, and then the second shutter curtain The electromagnet corresponding to is turned off, the second shutter curtain is opened and driven by the urging force of the spring, and the first shutter curtain and the second shutter curtain travel sequentially to perform exposure (for example, patents) Reference 1).

  In such a conventional focal plane shutter device, the delay time from the user's release operation to the opening of the first shutter curtain and the second shutter curtain can be shortened, and stable high-speed shutter performance can be obtained. There is an advantage.

Japanese Patent No. 3519502

  However, the structure of the conventional focal plane shutter device is advantageous for obtaining high-speed shutter performance, but at the time of low-speed shutter (long-second shutter), or when using valve time or mirror up, Since the electromagnet needs to be held in an energized state and the electromagnet is maintained in the energized state until the first shutter curtain or the second shutter curtain is opened, there is a disadvantage that power consumption increases.

  An object of the present invention is to provide a focal plane shutter device capable of reducing power consumption when using a low-speed shutter, when using a valve time, when using a mirror-up, etc. It is what.

Such an object is achieved by the present inventions (1) to (2) below.
(1) a shutter base plate having an opening corresponding to the shooting screen;
A first shutter curtain which supports a plurality of blades so that they move in parallel, and which can open and close the opening by the movement of the blades;
The second shutter is disposed on the opposite side of the first shutter curtain through the opening, and supports a plurality of blades so that they move in parallel, and the opening can be opened and closed by the movement of the blades. Shutter curtains,
A first shutter curtain drive motor rotatable in both directions; the first shutter curtain is closed by rotating the first shutter curtain drive motor in a predetermined direction; and the first shutter curtain drive motor is rotated in a direction opposite to the predetermined direction. First shutter curtain driving means for opening the first shutter curtain by
A second shutter curtain drive motor rotatable in both directions; the second shutter curtain is closed by rotating the second shutter curtain drive motor in a predetermined direction; and the second shutter curtain drive motor is rotated in a direction opposite to the predetermined direction. And a second shutter curtain driving means for opening the second shutter curtain.
Before the start of exposure, the first shutter curtain closes the opening and the second shutter curtain opens the opening, and the first shutter curtain opens the opening. And the second shutter curtain is in one of the second states in which the opening is closed,
When performing exposure from the first state, the first shutter curtain driving motor is operated so that the first shutter curtain opens the opening, and then the second shutter curtain closes the opening. As described above, exposure is performed by operating the second shutter curtain drive motor.
When performing exposure from the second state, the second shutter curtain driving motor is operated so that the second shutter curtain opens the opening, and then the first shutter curtain closes the opening. As described above, the focal plane shutter device performs exposure by operating the first shutter curtain drive motor.

  According to such a focal plane shutter device, the first shutter curtain and the second shutter curtain are caused to travel by the first shutter curtain drive motor and the second shutter curtain drive motor, respectively. Since it is not necessary to continue to energize the electromagnets that hold the curtains or the second shutter curtains before they run, they can operate with low power consumption. In particular, power consumption can be greatly reduced when using a low shutter speed (especially for long seconds), when using valve time, or when using mirror up.

  (2) When exposure is performed the next time after exposure from the first state, exposure is performed from the second state, and exposure is performed the next time after exposure is performed from the second state. The focal plane shutter device according to (1), wherein exposure is performed from the first state when performing.

  As a result, there is no shutter charging operation between photographing, the operation becomes efficient, and the power consumption can be further reduced.

  According to the present invention, the first shutter curtain and the second shutter curtain are driven by the first shutter curtain driving motor and the second shutter curtain driving motor, respectively. Therefore, unlike the conventional shutter device, the first shutter curtain or the second shutter curtain is used. Since it is not necessary to continue energizing the electromagnets that hold the curtains before they run, it is possible to operate with low power consumption. In particular, power consumption can be greatly reduced when using a low shutter speed (especially for long seconds), when using valve time, or when using mirror up.

  Hereinafter, a focal plane shutter device of the present invention will be described in detail based on a preferred embodiment shown in the accompanying drawings.

  FIG. 1 is a perspective view showing an embodiment of a focal plane shutter device of the present invention, and FIGS. 2 to 4 are front views of the focal plane shutter device shown in FIG. 1, respectively.

  The focal plane shutter device 1 (hereinafter referred to as the shutter device 1) shown in these drawings includes a first shutter curtain 2, a second shutter curtain 3, and a first shutter curtain driving means for driving the first shutter curtain 2. 4, a second shutter curtain driving means 5 for driving the second shutter curtain 3, and a shutter base plate 6 in which a rectangular opening 7 defining a photographing screen is formed.

  A first shutter curtain 2, a second shutter curtain 3, a first shutter curtain driving means 4, and a second shutter curtain driving means 5 are attached to the shutter base plate 6, and the first shutter curtain driving means 4 is the first shutter curtain driving means 4. The opening 7 is opened and closed by driving the first shutter curtain 2 or by the second shutter curtain driving means 5 driving the second shutter curtain 3. The shutter device 1 is attached to the camera body by fixing the shutter base plate 6 to a camera body (not shown).

  FIG. 2 is a view showing a state in which the first shutter curtain 2 closes the opening 7 of the shutter base plate 6 and the second shutter curtain 3 opens the opening 7.

  As shown in FIG. 2, the first shutter curtain 2 includes five blades 21, 22, 23, 24, 25, a first shutter curtain operating lever 26, and a parallel link lever 27. The base end portions of the blades 21, 22, 23, 24, and 25 are rotatably attached to the first shutter curtain operating lever 26 through pins 21a, 22a, 23a, 24a, and 25a, respectively, and the pin 21b , 22b, 23b, 24b, and 25b, and are rotatably attached to the parallel link lever 27, respectively.

  The base ends of the first shutter curtain operating lever 26 and the parallel link lever 27 are rotatably supported on the back side of the shutter base plate 6 via pins 26a and 27a, respectively. 26 is rotated by the first shutter curtain driving means 4 so that the five blades 21, 22, 23, 24, and 25 are spread (see FIG. 2) and overlapped (see FIG. 3). To change. The parallel link lever 27 regulates the movement of the blades 21, 22, 23, 24, 25 that move as the first shutter curtain operating lever 26 rotates, and the blades 21, 22, 23, 24, 25 are They are designed to move parallel to each other.

  Further, the first shutter curtain drive lever 26 is provided with an engagement pin 26b for transmitting the driving force from the first shutter curtain drive means 4 in the vicinity of the base end portion thereof. The engaging pin 26 b is accommodated in a long hole 26 c formed in the shutter base plate 6.

  FIG. 4 is a diagram showing a state in which the first shutter curtain 2 opens the opening 7 of the shutter base plate 6 and the second shutter curtain 3 closes the opening 7.

  As shown in FIG. 4, the second shutter curtain 3 includes five blades 31, 32, 33, 34, 35, a second shutter curtain operating lever 36, and a parallel link lever 37. Since the second shutter curtain 3 has a target structure in the vertical direction (moving direction of the blades) with respect to the first shutter curtain 2 described above, a detailed description of the structure is omitted.

  As shown in FIG. 1, the first shutter curtain drive means 4 is engaged with the first shutter curtain drive motor 41, the pinion gear 42 attached to the drive shaft of the first shutter curtain drive motor 41, and the pinion gear 42. It is composed of a matching idle gear 43.

  The first shutter curtain drive motor 41 is attached to the surface of a motor base plate 61 attached to the surface of the shutter base plate 6, and the shutter base plate is rotatable so that the drive shaft of the first shutter curtain drive motor 41 is rotatable. 6 is inserted. The pinion gear 42 is attached to the back side of the motor base plate 61.

  The idle gear 43 is rotatably supported between the shutter base plate 6 and the motor base plate 61 at a position where the idle gear 43 meshes with the pinion gear 42. Further, the idle gear 43 is connected to the first shutter curtain operating lever 26 via an engagement pin 26b accommodated in a long hole 26c formed in the shutter base plate 6, and via the pinion gear 42. The transmitted driving force of the first shutter curtain drive motor 41 is transmitted to the first shutter curtain drive lever 26 through the engagement pin 26b, and thereby the first shutter curtain drive lever 26 is rotated.

  As shown in FIG. 1, the second shutter curtain drive means 5 is engaged with the second shutter curtain drive motor 51, the pinion gear 52 attached to the drive shaft of the second shutter curtain drive motor 51, and the pinion gear 52. It is composed of a matching idle gear 53. Since the second shutter curtain driving means 5 has a vertically symmetrical structure with respect to the first shutter curtain driving means 4, the detailed description of the structure is omitted.

  Further, a shutter cover 62 and a shutter cover 63 formed so as to be able to accommodate the first shutter curtain 2 and the second shutter curtain 3 are attached to the back side of the shutter base plate 6. 2 The shutter curtain 3 is closed and accommodated in the shutter cover 62 and the shutter cover 63, respectively. Note that the shutter cover 62 and the shutter cover 63 may be formed integrally or may be formed of separate members.

  FIG. 5 is a block diagram of the shutter device 1. As shown in FIG. 5, the shutter device 1 includes a control unit 8 that controls the first shutter curtain drive motor 41 and the second shutter curtain drive motor 51. The control unit 8 is also commonly used as a CPU of a camera on which the shutter device 1 is mounted.

Hereinafter, the operation of the shutter device 1 described above will be described.
In the shutter device 1 in the release switch operation waiting state (the state before the start of exposure), as shown in FIG. 2, the first shutter curtain 2 widens the blades 21, 22, 23, 24, 25 and the shutter base plate 6 In the first state (hereinafter referred to as “upper standby state”) in which the second shutter curtain 3 is accommodated in the shutter cover 63 with the blades 31, 32, 33, 34, 35 overlapped. As shown in FIG. 4, the second shutter curtain 3 widens the blades 31, 32, 33, 34, 35 and closes the opening 7, and the first shutter curtain 2 has the blade 21, This is the second state (hereinafter referred to as “the lower standby state”) in which 22, 23, 24, and 25 are stacked and accommodated in the shutter cover 62.

  In the upper standby state shown in FIG. 2, when the release switch of the camera (not shown) is turned on by the user in the upper standby state shown in FIG. 2, the first shutter curtain drive motor 41 is activated and the drive shaft rotates counterclockwise in the drawing. The first shutter curtain operating lever 26 is rotated clockwise, and the blades 21, 22, 23, 24, 25 overlap each other while being translated downward in the drawing. When the blades 21, 22, 23, 24, 25 overlap each other while being translated downward, the opening 7 of the shutter base plate 6 is opened above the blades 21. When the blades 21, 22, 23, 24, and 25 overlap each other and the first shutter curtain 2 is accommodated in the shutter cover 62 (see FIG. 3), the first shutter curtain drive motor 41 stops and the first shutter curtain is stopped. The rotation of the operating lever 26 ends.

  On the other hand, the second shutter curtain drive motor 51 is activated after a predetermined time has elapsed since the release switch is turned on and the first shutter curtain drive motor 41 is activated as described above. The second shutter curtain actuating lever 36 is rotated in the clockwise direction. In the second shutter curtain 3, when the second shutter curtain operating lever 36 is rotated, the blades 31, 32, 33, 34, and 35 are parallel to the lower side in the drawing, contrary to the first shutter curtain 2 described above. It spreads while moving, and the opening 7 of the shutter base plate 6 is closed below the blade 31. When the blades 31, 32, 33, 34, and 35 are completely spread (see FIG. 4), the second shutter curtain drive motor 51 is stopped, and the rotation of the second shutter curtain operating lever 36 is finished. At this time, the opening 7 is completely closed by the second shutter curtain 3. In addition, the shutter device 1 enters a lower standby state.

  As described above, when the release switch is turned on in the upper standby state, first, the first shutter curtain drive motor 41 is activated and the first shutter curtain 2 travels, and the second shutter curtain drive motor 51 is activated after a predetermined time has elapsed. When the second shutter curtain 3 starts and starts running, exposure is performed.

  Further, in the shutter device 1, when the release switch is turned on in the lower standby state shown in FIG. 4, the second shutter curtain drive motor 51 is activated and driven, contrary to the above-described upper standby state. The shaft rotates clockwise, the second shutter curtain actuating lever 36 rotates counterclockwise, and the blades 31, 32, 33, 34, 35 overlap each other while being translated upward. When the blades 31, 32, 33, 34, and 35 overlap each other while moving upward, the opening 7 of the shutter base plate 6 is opened below the blade 31. When the blades 31, 32, 33, 34, and 35 overlap each other and the second shutter curtain 3 is accommodated in the shutter cover 63 (see FIG. 3), the second shutter curtain drive motor 51 stops, and the second shutter curtain The rotation of the operating lever 36 is completed.

  On the other hand, the first shutter curtain drive motor 41 is activated after a predetermined time has elapsed since the release switch is turned on and the second shutter curtain drive motor 51 is activated as described above, and the drive shaft rotates clockwise. Thus, the first shutter curtain operating lever 26 is rotated counterclockwise. When the first shutter curtain actuating lever 26 is rotated, the first shutter curtain 2 has the blades 21, 22, 23, 24, and 25 that are parallelly moved upward, contrary to the second shutter curtain 3 described above. Then, the opening 7 of the shutter base plate 6 is closed above the blades 21. When the blades 21, 22, 23, 24, and 25 are completely spread (see FIG. 2), the first shutter curtain drive motor 41 is stopped, and the rotation of the first shutter curtain operating lever 26 is finished. At this time, the opening 7 is completely closed by the first shutter curtain 2. Further, the shutter device 1 is in the upper standby state.

  As described above, in the shutter device 1, two frames can be shot by rotating the first shutter curtain drive motor 41 and the second shutter curtain drive motor 51 clockwise and counterclockwise.

  According to the shutter apparatus 1 as described above, the first shutter curtain 2 and the second shutter curtain 3 are caused to travel by the first shutter curtain drive motor 41 and the second shutter curtain drive motor 51, respectively. Therefore, unlike the conventional shutter apparatus. Since it is not necessary to continue to energize the electromagnets that hold the first shutter curtain 2 or the second shutter curtain 3 before traveling, it is possible to operate with low power consumption. In particular, power consumption can be greatly reduced when using a low shutter speed (especially for long seconds), when using valve time, or when using mirror up.

  FIG. 6 is a time sequence diagram of the shutter device 1 during normal shooting. Hereinafter, based on FIG. 6, an operation when performing normal shooting of two frames from when the shutter device 1 is in the lower standby state will be described.

  If the shutter release switch of the camera is turned on while the shutter device 1 is in the lower standby state, a mirror control motor (not shown) of the camera is activated and reversely rotated, and the mirror moves from the bottom to the top. When the mirror moves up, the second shutter curtain drive motor 51 starts and rotates (forward rotation), and the blades 31, 32, 33, 34, and 35 of the second shutter curtain 3 move upward. Thereby, the opening 7 of the shutter base plate 6 is opened. When the blades 31, 32, 33, 34, and 35 are accommodated in the shutter cover 63, the second shutter curtain drive motor 51 stops.

  After a predetermined time has elapsed since the activation of the second shutter curtain drive motor 51, the first shutter curtain drive motor 41 is activated and rotates (forward rotation), and each blade 21, 22, 23, 24, 25 of the first shutter curtain 2 is activated. Moves upward. Thereby, the opening 7 of the shutter base plate 6 is closed. When the blades 21, 22, 23, 24, and 25 are completely opened and the opening 7 is completely closed, the first shutter curtain drive motor 41 is stopped. At this time, the shutter device 1 enters an upper standby state.

  Next, the mirror control motor is activated to rotate forward, and the mirror moves from top to bottom. At the same time, a winding switch (not shown) is turned on. When the mirror moves down, the mirror control motor stops and the hoisting switch is turned off. Thereby, a series of photographing operations is completed.

  After the shutter device 1 enters the upper standby state by the above-described operation, when the release switch is turned on again, the mirror control motor starts and rotates in the reverse direction, and the mirror moves from the bottom to the top. When the mirror moves up, the first shutter curtain drive motor 41 starts and rotates (reverses), and the blades 21, 22, 23, 24, 25 of the first shutter curtain 2 move downward. Thereby, the opening 7 of the shutter base plate 6 is opened. When the blades 21, 22, 23, 24, 25 are accommodated in the shutter cover 62, the first shutter curtain drive motor 41 stops.

  After a predetermined time has elapsed since the activation of the first shutter curtain drive motor 41, the second shutter curtain drive motor 51 is activated and rotates (reverses), and the blades 31, 32, 33, 34, 35 of the second shutter curtain 3 are rotated. Move down. Thereby, the opening 7 of the shutter base plate 6 is closed. When the blades 31, 32, 33, 34, and 35 are completely opened and the opening 7 is completely closed, the second shutter curtain drive motor 51 is stopped. At this time, the shutter device 1 enters a lower standby state.

  Next, the mirror control motor is activated to rotate forward, and the mirror moves from top to bottom. At the same time, a winding switch (not shown) is turned on. When the mirror moves down, the mirror control motor stops and the hoisting switch is turned off. Thereby, a series of photographing operations is completed.

  As described above, the shutter device 1 can perform one exposure by rotating the second shutter curtain drive motor 51 and the first shutter curtain drive motor 41 forward from the lower standby state. It will be in a standby state. Then, from the upper standby state, the first shutter curtain drive motor 41 and the second shutter curtain drive motor 51 can be reversed to perform one exposure, thereby entering the lower standby state. That is, the shutter device 1 operates so as to alternately repeat the exposure operation from the lower standby state and the exposure operation from the upper standby state.

  As a result, the shutter device 1 does not require a conventional shutter charging mechanism, and can be simplified in configuration. Further, since there is no charge (winding) load, it contributes to reduction of power consumption.

  Furthermore, since a shutter charging operation is not required between shootings, the continuous shooting speed can be improved.

  The focal plane shutter device of the present invention has been described above with respect to the illustrated embodiment. However, the present invention is not limited to this, and each component constituting the focal plane shutter device may be any unit that can exhibit the same function. It can be replaced with the configuration of Moreover, arbitrary components may be added.

It is a perspective view showing an embodiment of a focal plane shutter device of the present invention. FIG. 2 is a front view of the focal plane shutter device shown in FIG. 1 (a state in which a first shutter curtain closes an opening of a shutter base plate and a second shutter curtain opens an opening). FIG. 2 is a front view of the focal plane shutter device shown in FIG. 1 (a state where both the first shutter curtain and the second shutter curtain are opened with a shutter base plate). FIG. 2 is a front view of the focal plane shutter device shown in FIG. 1 (a state where a first shutter curtain opens an opening of a shutter base plate and a second shutter curtain closes the opening). It is a block diagram of the focal plane shutter apparatus shown in FIG. It is a time sequence figure at the time of normal imaging | photography of the focal plane shutter apparatus shown in FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Focal plane shutter apparatus 2 1st shutter curtain 3 2nd shutter curtain 4 1st shutter curtain drive means 5 2nd shutter curtain drive means 6 Shutter base plate 7 Opening 8 Control part 21, 22, 23, 24, 25 Blade 21a, 21b, 22a, 22b, 23a, 23b, 24a, 24b, 25a, 25b, 26a, 27a Pin 26 First shutter curtain operating lever 26b Engaging pin 26c Slot 27 Parallel link lever 31, 32, 33, 34, 35 Blade 31a, 31b, 32a, 32b, 33a, 33b, 34a, 34b, 35a, 35b, 36a, 37a Pin 36 First shutter curtain operating lever 36b Engaging pin 36c Elongated hole 37 Parallel link lever 41 First shutter curtain drive motor 42 Pinion gear 43 Idle gear 51 2nd Potter blade driving motor 52 the pinion gear 53 idle gear 61 Motor bedplate 62 Shutter Cover 63 Shutter Cover

Claims (2)

A shutter base plate having an opening corresponding to the shooting screen;
A first shutter curtain which supports a plurality of blades so that they move in parallel, and which can open and close the opening by the movement of the blades;
The second shutter is disposed on the opposite side of the first shutter curtain through the opening, and supports a plurality of blades so that they move in parallel, and the opening can be opened and closed by the movement of the blades. Shutter curtains,
A first shutter curtain drive motor rotatable in both directions; the first shutter curtain is closed by rotating the first shutter curtain drive motor in a predetermined direction; and the first shutter curtain drive motor is rotated in a direction opposite to the predetermined direction. First shutter curtain driving means for opening the first shutter curtain by
A second shutter curtain drive motor rotatable in both directions; the second shutter curtain is closed by rotating the second shutter curtain drive motor in a predetermined direction; and the second shutter curtain drive motor is rotated in a direction opposite to the predetermined direction. And a second shutter curtain driving means for opening the second shutter curtain.
Before the start of exposure, the first shutter curtain closes the opening and the second shutter curtain opens the opening, and the first shutter curtain opens the opening. And the second shutter curtain is in one of the second states in which the opening is closed,
When performing exposure from the first state, the first shutter curtain driving motor is operated so that the first shutter curtain opens the opening, and then the second shutter curtain closes the opening. As described above, exposure is performed by operating the second shutter curtain drive motor.
When performing exposure from the second state, the second shutter curtain driving motor is operated so that the second shutter curtain opens the opening, and then the first shutter curtain closes the opening. As described above, the focal plane shutter device performs exposure by operating the first shutter curtain drive motor.   When exposure is performed the next time after exposure from the first state, exposure is performed from the second state, and exposure is performed the next time after exposure is performed from the second state. The focal plane shutter device according to claim 1, wherein exposure is performed from the first state.

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