JPH0248832Y2 - - Google Patents

Description

[Detailed description of the invention] "Technical field" The invention relates to focal plane ivy,
In particular, the present invention relates to a connection structure between a curtain body that runs just in front of the film surface and a curtain edge stopper that is adhesively fixed to the edge of the curtain body.

"Prior art and its problems" FIG. 2 shows a focal plane shutter that is the object of the present invention, in which the front curtain (curtain body) 10 and the rear curtain (curtain body) 20 each have on their edges, The curtain edge stops 11, 21 are fixed, and the curtain edge stops 11, 21 are fixed.
The ends of ribbons 12, 12 and 22, 22 are fixed to both ends of the ribbon. This curtain body 10 and ribbon 1
2 and 12 are wound around the winding shaft 13 and the winding shaft 14, respectively, and the ribbons 22, 22 are wound around the curtain body 10 and the ribbons 22, 22.
are wound around the winding shaft 23 and the winding shaft 24, respectively. When the shutter is set, these curtains or ribbons are wound up on the winding shafts 14 and 23 against spring means (not shown), and when the shutter is released, the curtains 10 and 20 are moved by the spring force.
The film travels in the direction of the arrow with a time lag corresponding to the set shutter speed value, and is wound onto the winding shafts 13 and 24. The shutter speed is regulated by the interval (slit) between the curtain edges 11 and 21.

By the way, the curtain edge stops 11 and 21 of this focal plane ivy are attached to the curtain body 1 as shown in FIG.
0 and 20 are sandwiched, and this is adhered to the end of the curtain body 10 via an instant adhesive, and is further press-bonded and fixed. However, in the conventional product, when the curtain edge stopper 11 is adhesively fixed, the curtain body 10 sometimes bends relative to the curtain edge stopper 11 as shown in FIG. When observed carefully, this bending direction always occurs in the opposite direction to the rubber film 10a formed on one surface of the curtain body 10. This bending allows the curtain body 10 or the curtain edge stopper 11 to be connected to another member, for example, the other curtain body 20.
In order to provide resistance by interfering with the curtain edge stopper 21,
The movement of the curtain body 10 becomes unstable, and as a result, the slit formed by the curtain edges 11 and 21 also becomes unstable, causing uneven exposure.

``Purpose of the invention'' The present invention solves the above-mentioned problems with the conventional device, and when adhesively fixing the curtain edge stopper to the edge of the curtain body,
The purpose is to obtain a joint structure that does not cause bending in the curtain body.

``Summary of the invention'' The present invention focuses on the fact that the bending of the curtain in the conventional device always occurs in the opposite direction to the rubber membrane surface of the curtain, as described above, and added the cause of the bending. The causes of bending in products are as follows.
It was completed after coming to the conclusion that this was due to the fact that the rubber surface of the curtain body was melted by the adhesive, the curtain body was extended by this melted part, and the end of the curtain edge stopper was located on the back side of the curtain body. It is something that For this reason, the present invention is characterized in that the amount of folding of the curtain side stopper that clamps the curtain body onto the curtain body is made larger on the other side than on the rubber membrane side.

``Embodiments of the invention'' The invention will be described below with reference to illustrated embodiments. FIG. 1 shows an embodiment of the present invention, and the same parts as in the conventional product shown in FIGS. 3 and 4 are given the same reference numerals. The curtain bodies 10, 20 are entirely made of cloth, and rubber films 10a, 20a are formed on one side thereof. The curtain edge stopper 30 of the present invention is
0, and has a folded edge 30a on the rubber film 10a of the curtain body 10 and a folded edge 30b on the back side thereof. The folding amount l1 of the folding edge 30b onto the curtain body 10 is longer than the folding amount l2 of the folding edge 30a onto the curtain body 10.

The curtain edge stopper 30 is adhered to the edge of the curtain body 10 with an instant adhesive, and is further press-bonded and fixed, as in the conventional product. At this time, even if the rubber of the rubber film 10a is slightly melted by the instant adhesive, the folded edge 30b is located on the back side of the melted part, and the end thereof is not located.
The curtain body 10 is prevented from bending toward the rubber film 10a. That is, the folding amount l2 of the folding edge 30b
is longer than that of the folded edge 30a l1, so
Even if the rubber of the rubber film 10a is partially melted at the end of the folded edge 30a, the folded edge 30b is
Reinforce from the back side to prevent it from bending. Therefore, the curtain body 10 and the curtain edge stopper 30 can be adhered in a straight line.

``Effects of the Invention'' As described above, according to the present invention, the amount of folding of the curtain edge stopper adhesively fixed to the edge of the curtain of the focal plane ivy on the curtain is increased from the rubber curtain side to the back side of the curtain. With a simple structure in which the curtain is longer than the curtain, it is possible to prevent the curtain from bending when the two are fixed with adhesive. Therefore, it is possible to prevent the curtain body or the curtain edge stopper from interfering with other parts, stabilize the running condition, and obtain accurate shutter speed. Moreover, since the yield is improved, economical efficiency can also be improved.

[Brief explanation of the drawing]

Figures 1A and B are a perspective view of the curtain body and curtain edge stopper in a separated state and a side view in an adhered state, showing an embodiment of the present invention, Figure 2 is a conceptual diagram of a focal plane shutter, and Figure 3A , B are a perspective view and a side view of a conventional curtain body and a curtain edge stopper in a separated state, and FIGS. 4A and 4B are a perspective view and a side view of the same in a bonded state. 10, 20... Curtain body, 10a, 20a... Rubber film, 30... Curtain edge stop, 30a, 30b... Folded edge.

Claims (1)

[Scope of utility model registration request] In a focal plane shutter, a curtain edge stopper having a folded edge for the front and back of the curtain body is adhesively fixed to the edge of a curtain body formed with a rubber film on one side, which runs just in front of the film surface. A combined structure of a focal plane ivy curtain and a curtain edge stopper, characterized in that the amount of folding of the edge over the curtain is larger on the other side than on the rubber membrane side.