JPH05134293A - Focal plane shutter device - Google Patents

Abstract

PURPOSE:To improve assembling workability by individually fixing a shutter driving shaft and a mirror and diaphragm driving shaft on a plate so that they may be orthogonally crossed with each other and fixing the plate on a shutter substrate. CONSTITUTION:A mirror driving mechanism 101 is provided with the mirror and diaphragm driving shaft 105, and a mirror driving lever 107 supported by the shaft 105. A diaphragm driving mechanism 103 is provided with a diaphragm driving lever 109 engaged with the mirror and diaphragm driving shaft 105. The shutter driving shaft, and the mirror and diaphragm driving shaft 105 are fixed on the plate 45 so that they may be orthogonally crossed with each other, and a shutter driving lever 59 is turnably engaged in the shutter driving shaft. When the plate 45 is fixed on the shutter substrate 27, the shutter driving lever 59 is positioned on a shutter driving position, the mirror driving lever 107 is positioned on a mirror 23 driving position and the diaphragm driving lever 109 is arranged on a diaphragm driving position.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a focal plane shutter device for a camera.

[0002]

2. Description of the Related Art In a conventional shutter device, a shutter driving mechanism is assembled on the basis of a shutter driving shaft fixedly mounted on a shutter substrate, and a mirror driving mechanism and an aperture driving mechanism are mounted on a side substrate forming a mirror box. It was assembled based on the mirror drive shaft that was fixed to the.

Since the mirror drive mechanism also serves as the shutter charge mechanism of the shutter drive mechanism, the mirror drive mechanism is assembled in consideration of the relative positional relationship when both drive mechanisms operate. It was

The applicant has already applied for a shutter device in which the mirror box and the shutter substrate are integrally formed of resin.

[0005]

In the conventional shutter device, when attaching the shutter drive mechanism to the shutter substrate, the attachment position must be determined from the center of the optical axis, and the mirror drive mechanism is not used. Also when mounting on the mirror box, the mounting position had to be determined with respect to the short side direction of the shutter substrate and the optical axis direction.

Further, even though the mirror drive mechanism also serves as the shutter charge mechanism of the shutter drive mechanism, both drive mechanisms are individually attached to the mounting substrate during assembly, so that both drive mechanisms are attached. There is a problem in that it is difficult to obtain relative positional accuracy, which makes the assembly work of the device extremely difficult and time consuming.

Further, due to the mechanism design, when the relative positions of the two drive mechanisms are slightly displaced, when the drive mechanisms are operated,
Since it is necessary to secure a space that can cover the deviation, there is a problem that the apparatus is downsized, the energy for operating the drive mechanism is reduced, and the operation time is shortened.

Further, the shutter device must be set so that the shutter drive shaft and the mirror drive shaft or the diaphragm drive shaft are orthogonal to each other in terms of the structure. However, in a device in which a mirror box and a shutter substrate are integrally formed, it is impossible to fix both drive shafts on the mounting substrate so that they are orthogonal to each other, and of course, the shutter drive mechanism and the mirror drive mechanism or the aperture drive mechanism are not fixed. It was impossible to install each.

Some deviations in the mounting positions of the shutter drive mechanism, the mirror drive mechanism, and the diaphragm drive mechanism with respect to the optical axis direction and the long side direction (horizontal direction) of the shutter substrate are caused when the shutter and the mirror or the diaphragm are actually driven. , Has almost no effect on control.

This is because the driving direction of the shutter, the mirror or the diaphragm is the short side direction (vertical direction) of the shutter substrate. Therefore, the most important mounting position is the position in the vertical direction.

The present invention has been made to solve such a conventional problem. When assembling the shutter device, it is possible to set the mounting position in one direction (vertical direction) of one drive mechanism and We provide a focal plane shutter device that can automatically determine the mounting position of the drive mechanism, and can assemble the shutter drive mechanism and the mirror drive mechanism or the diaphragm drive mechanism even when the mirror box and the shutter substrate are integrally molded. The purpose is to do.

[0012]

A focal plane shutter device according to a first aspect of the present invention includes a shutter substrate which is arranged on a film surface side of the mirror box perpendicular to a side surface of the mirror box which is parallel to the optical axis direction. A plate arranged on the side opposite to the film surface side of the shutter substrate,
A shutter drive shaft arranged perpendicular to the shutter substrate, a shutter drive lever pivotally supported by the shutter drive shaft to move the shutter, and a mirror drive shaft arranged perpendicular to the side surface of the mirror box. A mirror drive lever that is pivotally supported by the mirror drive shaft and drives a mirror, and the shutter drive shaft and the mirror drive shaft are fixed to the plate so as to be orthogonal to each other. When the plate is fixed to the shutter, the shutter driving lever is positioned to drive the shutter, and the mirror driving lever is positioned to drive the mirror.

A focal plane shutter device according to a second aspect of the present invention is the focal plane shutter device according to the first aspect, wherein an aperture drive shaft arranged perpendicularly to the side surface of the mirror box and an aperture drive for engaging the aperture drive shaft to drive the aperture. An aperture drive mechanism having a lever, wherein the shutter drive shaft and the aperture drive shaft are fixed to the plate so as to be orthogonal to each other, and when the plate is fixed to the shutter substrate, the shutter is released. The drive lever is arranged at a position for driving the shutter, and the diaphragm driving lever is arranged at a position for driving the diaphragm.

A focal plane shutter device according to a third aspect of the present invention is the focal plane shutter device according to the first aspect, wherein the shutter substrate is formed integrally with the mirror box.

[0015]

According to the focal plane shutter device of the present invention, the shutter driving shaft and the mirror driving shaft are fixed to the plate so as to be orthogonal to each other, and when the plate is fixed to the shutter substrate, the shutter driving lever causes the shutter to move. Is positioned to drive the mirror, and the mirror drive lever is positioned to drive the mirror.

According to another aspect of the focal plane shutter device of the present invention, the shutter driving shaft and the diaphragm driving shaft are fixed to the plate so as to be orthogonal to each other, and when the plate is fixed to the shutter substrate, the shutter driving lever moves the shutter. The diaphragm driving lever is arranged at a position for driving, and the diaphragm driving lever is arranged at a position for driving the diaphragm.

In the focal plane shutter device of the third aspect, the shutter substrate is formed integrally with the mirror box.

[0018]

Embodiments of the present invention will be described below in detail with reference to the drawings. 1 to 3 show an embodiment of the focal plane shutter device of the present invention. In FIG. 1, reference numeral 21 denotes a mirror box.

A movable mirror 23 is housed in the mirror box 21 so as to be rotatable around an upper portion 23A,
The movable mirror 23 is configured to be rotated by moving a mirror rotation pin 26 inserted in the drive hole 25.

A shutter substrate 27 is arranged on the film surface side (not shown) of the mirror box 21. The shutter substrate 27 and the mirror box 21 are integrally formed of resin.

As shown in FIG. 2, on the film surface side of the shutter substrate 27, which is not shown, the second plate 2 made of, for example, metal is provided at a predetermined interval from the shutter substrate 27.
9 are arranged.

A blade group 33 composed of a plurality of light-shielding thin plates 31 is housed between the shutter substrate 27 and the second plate 29. The blade group 33 includes a front curtain group 35 and a rear curtain group 37.

Between the shutter base plate 27 and the second plate 29, drive arms 41 and 4 for moving the blade group 33.
2, 43, 44 are arranged and drive arms 41,
42, 43, 44 are, for example, swaged to the blade group 33.
Is linked to.

In this embodiment, the drive arms 41,
42 drives the front curtain group 35 to drive the drive arms 43, 4
4 runs the trailing curtain group 37. On the side of the shutter substrate 27 opposite to the film surface side (not shown), plates 45 made of metal such as iron are arranged at a predetermined interval.

This plate 45 has
Is attached to the fixing portion 47 of the shutter substrate 27 with a screw 48. The plate 45 includes shutter drive shafts 51 and 52, which are support shafts.
And a charge cam shaft 53 is arranged.

The shutter drive shafts 51 and 52 and the charge cam shaft 53 have one end at the plate 4 respectively.
It is fixed to 5 by caulking 55. Shutter drive levers 57 and 59 are rotatably fitted on the shutter drive shafts 51 and 52.

Between the shutter drive levers 57, 59 and the locking collar 61, a biasing means 63 which is a drive spring and biases the shutter drive levers 57, 59 in the traveling direction of the blade group 33 is arranged. There is.

Further, an iron piece 65 is arranged on the shutter drive levers 57 and 59, and the shutter drive levers 57 and 59 are attracted by the electromagnet 67.
59 is held.

A charge cam 69 for charging the shutter drive levers 57 and 59 is rotatably fitted on the charge cam shaft 53. This charge cam 69 has
The rotation of the motor 75 is transmitted via the connecting lever 71 and the gear 73 that form a link.

The other ends of the shutter drive shafts 51, 52 pass through drive shaft holes 78, 79 formed in the pressing plate 77 and the shutter base plate 27, and are inserted into the rotation center holes 81 of the drive arms 41, 44. There is.

Further, second shutter drive shafts 83, 84 are integrally formed on the shutter substrate 27, and these second shutter drive shafts 83, 84 are connected to the rotation center holes of the drive arms 42, 43. 81 is inserted.

A lever shaft 85 is integrally formed with the shutter drive levers 57 and 59, and the lever shaft 85 is inserted into an arcuate hole 87 formed in the shutter substrate 27. It is configured to be inserted into a through hole 89 formed in 44 so that the displacement of the shutter drive levers 57 and 59 is transmitted to the drive arms 41 and 44.

In FIGS. 1 and 3, reference numeral 101 is a mirror driving mechanism, and reference numeral 103 is an aperture driving mechanism. The mirror driving mechanism 101 includes a mirror / diaphragm driving shaft 105 arranged perpendicularly to the side surface of the mirror box 21.
And the mirror / diaphragm drive shaft 105, and the mirror 23
And a mirror drive lever 107 for driving the.

A shutter drive shaft 51 and a mirror / diaphragm drive shaft 105 are fixed to the plate 45 so as to be orthogonal to each other.
When is fixed, the shutter drive lever 57 is positioned to drive the shutter, and the mirror drive lever 107 is positioned to drive the mirror 23.

The diaphragm driving mechanism 103 is the mirror
The shutter substrate 2 is provided with a diaphragm drive lever 109 that engages with the diaphragm drive shaft 105 and drives a diaphragm (not shown).
When the plate 45 is fixed to 7, the shutter drive lever 57 is arranged at a position for driving the shutter, and the diaphragm drive lever 109 is arranged at a position for driving the diaphragm.

In the focal plane shutter device configured as described above, when the release button (not shown) is fully pressed, the motor 75 rotates, the charge cam 69 retracts, and the movable mirror 23 mirrors up. After this, the electromagnet 67 is turned off, and the shutter drive lever 5
The holding of the iron pieces 65 of 7, 7 by the electromagnet 67 is released, the spring force of the biasing means 63 causes the shutter drive levers 57, 59 to rotate, and the rotation of the shutter drive levers 57, 59 causes the lever connecting portion 85 to rotate. Is transmitted to the drive arms 41 and 44 via the, and the blade group 33 travels.

Then, after the traveling of the blade group 33,
The motor 75 is driven. The drive of the motor 75 causes the charge cam 69 to rotate via the gear 73 and the connecting lever 71, and the rotation of the charge cam 69 causes the shutter drive levers 57 and 59 to move in the direction opposite to the biasing direction of the biasing means 63. The shutter drive levers 57 and 59 are rotated.
The iron piece 65 of the electromagnet 67 at the top dead center of the charge cam 69.
It is held at the position where it is adsorbed.

On the other hand, when the connecting lever 71 rotates, the mirror driving lever 107 is moved through the pin members 121 and 123.
However, the mirror / aperture drive shaft 105 is rotated, and the mirror drive lever 107 rotates the mirror rotation pin 26 to move the mirror 23.

Further, when the mirror drive lever 107 rotates, the pin member 1 fixed to the mirror drive lever 107.
25, the diaphragm drive lever 109 rotates about the mirror / diaphragm drive shaft 105, and the diaphragm drive lever 10
A diaphragm (not shown) is driven by 9.

Thus, in the focal plane shutter device constructed as described above, the shutter drive shaft 51 of the shutter drive mechanism 127 is mounted on the same plate 45.
And the mirror / diaphragm drive shaft 105 of the mirror drive mechanism 101
With respect to the short side direction (vertical direction) of the shutter substrate 27, that is, the shutter drive mechanism 1
When 27 is attached, the mirror drive mechanism 101 is configured to have a positional relationship in which the mirror 23 is arranged at a position where the mirror 23 can be driven. As a result, the other drive mechanism can also be attached at an accurate attachment position in the up-down direction, and installation workability is greatly improved compared to the conventional device.

Further, on the same plate 45, the shutter drive shaft 51 of the shutter drive mechanism 127 and the mirror / diaphragm drive shaft 105 of the aperture drive mechanism 103 are placed at predetermined positions in the short side direction (vertical direction) of the shutter substrate 27. In other words, since the diaphragm driving mechanism 103 has a positional relationship in which the diaphragm driving mechanism 103 is arranged at a position where the diaphragm can be driven when the shutter driving mechanism 127 is mounted, the mounting position of one of the driving mechanisms can be set up and down. By accurately determining the direction, the other drive mechanism can also be mounted at the correct mounting position in the vertical direction, and the mounting workability is significantly improved as compared with the conventional device.

Further, in advance, one charge mechanism is connected to the shutter drive mechanism 127 on the same plate 45.
Since the mirror driving mechanism 101 and the diaphragm driving mechanism 103 can be used in common, it is not necessary to adjust the positional relationship between the driving mechanisms during the mounting work.

Further, on the same plate 45, the shutter drive shaft 51 and the mirror / diaphragm drive shaft 105 are constructed so as to be orthogonal to each other in the optical axis direction and the long side direction (horizontal direction) of the shutter substrate 27. By deciding the vertical mounting position of each drive mechanism and engaging each drive mechanism with the shutter and the mirror or diaphragm, the mounting position of each drive mechanism may be slightly shifted in the optical axis direction and the horizontal direction. However, the actual drive amount and drive direction of the shutter and the mirror or the diaphragm are accurately transmitted.

Further, in the focal plane shutter device constructed as described above, the plate 45 is provided with the support shafts such as the shutter drive shafts 51 and 52 and the charge cam shaft 53 fixedly mounted, and the shutter is centered around these shafts. The drive levers 57, 59, the biasing means 63, etc. are arranged, and the plate 4
5 is fixed to the shutter substrate 27 at the mounting portion 49, one end of the shutter drive shafts 51 and 52 is supported by the supporting portions 78 and 79 of the shutter substrate 27, while the hole portion 87 of the shutter substrate 27 is Since the lever shafts 85 of the shutter drive levers 57 and 59 are inserted and the lever shafts 85 are connected to the drive arms 41 and 44, the accuracy and assembling of the blade group drive mechanism can be significantly improved as compared with the conventional case.

That is, in this focal plane shutter device, the shutter drive shafts 57, 5 are attached to the plate 45.
9. Since the support shafts such as the charge cam shaft 53 are fixed,
These relative position accuracies are not affected by the molding accuracy of the shutter substrate 27, thermal deformation of the shutter substrate 27, or the like, and the precision of the blade group drive mechanism can be greatly improved as compared with the related art.

After assembling the main part of the blade group driving mechanism to the plate 45, the plate 45 is attached to the shutter substrate 27.
As a result, it is possible to greatly improve the assemblability as compared with the conventional one.

In this embodiment, the plate 45
The shutter drive shafts 51 and 52 and the charge cam shaft 53
Since the support shafts for the shutter drive levers 57, 59, the charge cam 69, etc. are prevented from coming off by the pressing plate 77, the main part of the blade group drive mechanism can be reliably and independently assembled to the plate 45. It will be possible.

In the focal plane shutter device described above, the shutter substrate 27 is the mirror box 2.
Since the shutter substrate 27 is integrally formed with the blade 1, the strength of the shutter substrate 27 is improved, and thus the precision of the blade group driving mechanism can be further improved.

Furthermore, since the shutter substrate 27 and the mirror box 21 are made of resin, the weight of the device can be reduced. Further, since the plate 45 is formed of a material that is less likely to be deformed than the shutter substrate 27, for example, a metal, the accuracy of the blade group drive mechanism can be improved. Furthermore, the shutter drive shafts 51, 52
However, since the drive arms 41 and 44 are axially supported by the shutter drive shafts 51 and 52 which are arranged so as to penetrate through the shutter substrate 27, the accuracy and assemblability of the blade group drive mechanism can be greatly improved as compared with the conventional case. it can.

FIG. 4 shows another embodiment of the present invention. In this embodiment, the second shutter drive shafts 95 and 9 are used.
7 is fixed to the pressing plate 77 with screws 99. Even in such a focal plane shutter device, substantially the same effect as the above-described embodiment can be obtained, but in this embodiment, the second shutter drive shaft 95,
Since 97 is fixed to the pressing plate 77 with the screw 99, it is not necessary to form the second shutter drive shaft on the shutter substrate 27, and the precision and the assemblability of the blade group drive mechanism can be further improved. it can.

[0051]

In the focal plane shutter device of the present invention, the shutter driving mechanism and the mirror driving mechanism or the diaphragm driving mechanism are provided on the same substrate in a predetermined positional relationship in the short side direction (vertical direction) of the shutter substrate, that is,
When the shutter drive mechanism is attached, the mirror drive mechanism or the diaphragm drive mechanism is configured to have a positional relationship in which the mirror can be driven. By accurately determining the other drive mechanism, the other drive mechanism can be attached at an accurate attachment position in the vertical direction, and the installation workability is significantly improved as compared with the conventional device.

Further, since the shutter drive mechanism and the mirror drive mechanism or the diaphragm drive mechanism can be used as one charge mechanism on the same substrate in advance, each drive mechanism can be used at the time of mounting work. There is no need to adjust the positional relationship between them.

Furthermore, on the same substrate, the drive axis of the drive mechanism is the optical axis direction and the long side direction (left-right direction) of the shutter substrate.
Since they are configured so as to be orthogonal to each other, by determining the mounting position of the drive mechanism in the vertical direction and engaging the drive mechanism with the shutter and the mirror or the diaphragm, the mounting position of each drive mechanism will be slightly Even if there is a shift in the axial direction and the left-right direction, the actual driving amount and driving direction of the shutter and the mirror or the diaphragm will be accurately transmitted.

[Brief description of drawings]

FIG. 1 is a perspective view showing an embodiment of a focal plane shutter device of the present invention.

FIG. 2 is a view of the focal plane shutter device II of FIG.
It is a sectional view taken along the line II.

3 is a perspective view showing a state in which the focal plane shutter device of FIG. 1 is assembled.

FIG. 4 is a sectional view showing another embodiment of the focal plane shutter device of the present invention.

[Explanation of symbols]

 21 mirror box 27 shutter substrate 45 plate 51, 52 shutter drive shaft 57, 59 shutter drive lever 101 mirror drive mechanism 103 aperture drive mechanism 105 mirror / aperture drive shaft 107 mirror drive lever 109 aperture drive lever 127 shutter drive mechanism

Claims (3)

[Claims] 1. A shutter substrate arranged on the film surface side of the mirror box perpendicular to a side surface of the mirror box parallel to the optical axis direction, and arranged on a side opposite to the film surface side of the shutter substrate. A plate, a shutter drive shaft arranged perpendicular to the shutter substrate, a shutter drive lever pivotally supported by the shutter drive shaft to move the shutter, and a mirror arranged perpendicular to the side surface of the mirror box A drive shaft; and a mirror drive lever that is pivotally supported by the mirror drive shaft and that drives a mirror. The plate is fixed to the shutter drive shaft and the mirror drive shaft so as to be orthogonal to each other. When the plate is fixed to the shutter substrate, the shutter driving lever is positioned to drive the shutter. The focal plane shutter device is characterized in that the mirror driving lever is positioned at a position for driving the mirror. 2. An aperture stop drive shaft disposed perpendicularly to a side surface of the mirror box, and an aperture stop drive mechanism having an aperture stop drive lever that engages with the aperture stop drive shaft and drives an aperture stop, The shutter drive shaft and the aperture drive shaft are fixed to the plate so as to be orthogonal to each other, and when the plate is fixed to the shutter substrate, the shutter drive lever is arranged at a position to drive the shutter, The focal plane shutter device according to claim 1, wherein the aperture drive lever is arranged at a position for driving the aperture. 3. The focal plane shutter device according to claim 1, wherein the shutter substrate is formed integrally with the mirror box.