JP3069735B2 - Focal plane shutter - Google Patents

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 having a simplified shutter structure for a camera shutter.

[0002]

2. Description of the Related Art In response to recent demands for weight reduction and compactness of a camera, a focal plane shutter includes an open blade unit in which a plurality of shutter blades are stacked and a closed blade unit in which a plurality of shutter blades are also stacked. Have. An opening blade unit that covers the shutter opening opens the shutter opening, and a closing blade unit closes the shutter opening after a lapse of a predetermined time according to the shutter speed. In this way, the exposure is properly performed by the cooperation of the open blade unit and the closed blade unit. As such a focal plane shutter,
For example, there is one as shown in FIG. The substrate 70 has respective arm rotation centers 70b, 70c, 70d, 70
The arm 31, 32, 42, 41 is rotatably provided on e. The open blade unit 30 and the closed blade unit 40 are composed of a plurality of shutter blades, and each of the shutter blades is connected to one end of the arm 31, 32, 42, 41.

In the exposure operation, the arms 31, 4
When the drive levers 50 and 60, which are fitted with the first and coaxially supported by the rotation centers 70b and 70e of the arms, respectively drive the arms 31 and 41, the open blade unit 30 and the closed blade unit 40 are sequentially moved downward in the figure. From above to perform the exposure operation. Further, the shutter blades constituting each blade unit in the open blade unit 30 and the closed blade unit 40 all have different shapes at least in the same blade unit.

[0004]

However, in such a conventional focal plane shutter, since the shutter blades constituting the same blade unit all have different shapes as described above, the types of parts are increased, and the number of types of components is increased. There is a problem that the cost is higher than other parts in various fields such as unit manufacturing and management. Further, a method of further reducing the storage space of the blade unit that is folded above the camera by further subdividing the blade unit divided into a plurality of units to reduce the size of the camera is already known. There is an inconvenience that the number of types of parts increases and the cost increases.

[0005]

In order to solve the above-mentioned problems, according to the present invention, a blade unit composed of a plurality of divided shutter blades and a plurality of arms supporting the shutter blades travels. In a focal plane shutter in which an exposure operation is performed, a plurality of shutter blades having the same shape are used in the same blade unit.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Since a focal plane shutter has a configuration in which a plurality of shutter blades of the same shape are used in the same blade unit, the number of types can be reduced without changing the number of components, or the number of components can be reduced without changing the type of components. Since the number of shutter blades can be increased, the cost of the blade unit can be reduced in various fields such as manufacturing and management compared to the conventional blade configuration, and when the number of shutter blades is increased when downsizing the camera. Will also be advantageous.

[0007]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a rear view showing the open blade unit side of the focal plane shutter according to the present invention. As shown in FIG. 1, arms 8 and 9 which are provided side by side in substantially the same direction and constitute a parallel link mechanism are respectively shown in FIG. Arm support shaft 7
It swings forward and backward about b and 7c. Arm 8,
In the longitudinal direction of 9, the blades 1, 2, 2,
3, 4 and 5 are rotatable, respectively.
12,22,13,23,14,24,15,25.

That is, the shutter blade 1 is a blade pin 1
It is rotatably supported by arms 8 and 9 via 1 and 21. Similarly, the shutter blades 2 and 3 are
It is rotatably supported by arms 8, 9 via 2, 22, 13, 23. Further, as shown in FIG. 2, the shutter blade 4 has a coupling hole 4 at the right end thereof.
a, 4b, and 4c are provided. Similarly, coupling holes 5a, 5b, and 5c are provided at the right end of the shutter blade 5. Further, the shutter blade 5 is obtained by turning the shutter blade 4 upside down, and the coupling holes 4a and 5a, 4b and 5b, 4c and 5c correspond to each other. That is, by using the coupling holes 4a and 4b for supporting the shutter blade 4 and using the coupling holes 5c and 5a for supporting the shutter blade 5, it is possible to arrange the shutter blades of the same shape at different positions. Used for the same blade unit. Also, the same parts are arranged at different positions in the arm 8 and the arm 9 and used for the same blade unit. The shutter blade 1 is provided with a hole 1a, and is driven to rotate simultaneously with the drive lever 10 in the forward and reverse directions by the rotation of the drive lever 10. In addition, with such a configuration, the drive lever 10 is provided with a degree of freedom, and it is not necessary to arrange the drive lever 10 coaxially with the center of rotation of the arm as in the related art.

In this embodiment, the shutter blades 4 and 5 and the arms 8 and 9 are formed of the same components, but the effect can be obtained only by the shutter blades. Further, if parts having different materials and processes have the same shape, an effect can be obtained in the manufacturing process. Further, if the same component is used for a large number of shutter blades, it goes without saying that a greater effect can be obtained. Therefore, in the shutter device configured as described above, for example, the shutter blade 1 is
, The shutter blades 2, 3, 4, 5 and the arm 9 sequentially follow the shutter blade 1 and swing in the same direction via the arm 8, whereby the shutter blades 1, 2, 2,
3, 4, and 5 open and close the shutter opening 7a.
The open blade unit using the present invention has been described above. However, the present invention can be similarly applied to a closed shutter blade, and the open blade unit and the closed blade unit are configured by the same component. Needless to say, this may be done.

[0010]

As is clear from the above embodiments, according to the blade unit of the focal plane shutter having a plurality of shutter blades of the same shape in the same blade unit as in the present invention, the parts By reducing the number of components without changing the number or increasing the number of components without changing the type of components, a shutter having the same function as that of the related art can be configured, so that the cost can be reduced as compared with the related art. It is also advantageous when increasing the number of shutter blades when downsizing the camera.

[Brief description of the drawings]

FIG. 1 is a rear view of an embodiment of a focal plane shutter according to the present invention.

FIG. 2 is a shutter blade used in the embodiment of FIG.

FIG. 3 is a rear view of a conventional focal plane shutter.

[Explanation of symbols]

 1, 2, 3, 4, 5 shutter blade 8, 9 arm

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁷ , DB name) G03B 9/08-9/54

Claims (1)

(57) [Claims] 1. A focal plane shutter in which an exposure operation is performed by running two sets of blade units each including a plurality of divided shutter blades and a plurality of arms supporting the shutter blades, wherein the same blades are provided. A focal plane shutter comprising a plurality of shutter blades having the same shape in a unit.