JPH0442823Y2 - - 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 curtain body 20 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 as shown in Fig. 3A and B.
It has a folded shape that sandwiches the curtain bodies 10 and 20, and is attached to the end of the curtain body 10 with an instant adhesive, and is further press-bonded and fixed.

However, in conventional products, when applying the adhesive to the back side of the curtain edge stopper 11, there are cases where the adhesive cannot be applied uniformly. There will be variations in adhesive strength in orthogonal directions. In particular, in the worst case where the adhesive was not applied partially, the adhesive could not be bonded even by press bonding. Furthermore, if the so-called open time from application of the adhesive to adhesion is long, poor adhesion may occur as well. When such adhesion failure occurs, the slit made up of the front and rear curtain edges 11 and 21 becomes unstable, and the running resistance of the curtains 10 and 20 increases, making it impossible to obtain the desired shutter speed. A situation may arise. In the conventional structure, when such adhesion failure occurs, there is no appropriate means to correct it, and for this reason, the actual situation is that defective products are discarded.

``Purpose of the invention'' This invention solves the above-mentioned problems with conventional devices, and prevents adhesive failure from occurring partially between the curtain edge stopper and the curtain body due to uneven adhesive application. The purpose of the present invention is to obtain a combined structure of a curtain body and a curtain edge stop that can easily correct this problem. Another object of the present invention is to obtain a joint structure between a curtain edge stopper and a curtain body that can further increase adhesive strength.

``Summary of the invention'' The present invention involves drilling a plurality of small holes for inserting adhesive in a row in the direction perpendicular to the running direction of the curtain body on the folded edge of the curtain edge stopper. It is characterized in that the curtain edge stopper is adhered to the curtain by an adhesive applied to the inner surface of the folded edge and an adhesive inserted into the inner surface of the folded edge through at least one of the plurality of small holes.

``Embodiments of the invention'' The invention will be described below with reference to illustrated embodiments. Figures 1A and 1B show embodiments of the present invention;
Components that are the same as those of the conventional product shown in FIGS. The basic shape of the curtain edge stopper 30 of the present invention is the same as that of conventional products, and has a pair of folded edges 30a and 30b that are bonded to the front and back sides of the curtain body 10. The present invention uses these folded edges 30a, 30b.
at regular intervals in the longitudinal direction,
It is characterized by having a plurality of small holes 31 for inserting adhesive. The spacing and diameter of the small holes 31 are such that when the folded edges 30a, 30b are correctly bonded to the curtain body 10, the bonding strength is not impaired, and on the other hand, when the folded edges 30a, 30b are properly bonded, the defective bonding portions
The adhesive inserted through the small hole 31 can substantially cover the small hole 31 wherever it occurs in the longitudinal direction.

When adhering this curtain edge stopper 30 to the curtain body 10, first apply adhesive to the back side of one of the folded edges 30a, 30b (for example, the side marked a in the figure), and apply this to the edge of the curtain body 10. Join and press-bond. Then, when one side is finished adhering, the other side (same b)
Similarly, the adhesive is applied to the edge of the curtain body 10, and the curtain edge stopper 30 is bonded to the curtain body 10 by pressing.

In this adhesion process, if the adhesive is unevenly applied and as a result, a part of the folded edges 30a, 30b rises from the curtain body 10 or other adhesion failure occurs, the curtain edge stopper 3 is inserted through the small hole 31 closest to the relevant part.
Adhesive is inserted into the gap between 0 and curtain body 10, and the adhesive is press-bonded to completely adhere them. Furthermore, in the bonding process, adhesive can be inserted into the small holes 31 even when it is determined that no defective bonding has occurred, thereby increasing the reliability of bonding.

"Effects of the Invention" As described above, according to the present invention, on the folded edge of the curtain stopper that is adhesively fixed to the edge of the curtain of the focal plane ivy, the curtains are arranged in a row in a direction perpendicular to the running direction of the curtain. Due to the simple structure in which a plurality of small holes can be drilled through the curtain edge stopper, the curtain edge stopper can be adhesively fixed to the curtain body more reliably. Therefore, it is possible to stabilize the running state of the slit and the curtain formed by the curtain edge stopper, and to obtain a focal plane shutter with higher accuracy. In particular, if adhesive is inserted into the small holes regardless of the presence or absence of poor adhesion, a curtain edge stopper with higher reliability and durability can be obtained. Additionally, in the event that a bonding defect occurs, the defect can be resolved with adhesive inserted through the small hole, making it possible to use defective bonding products that would previously have been discarded, improving yields and reducing costs. I can figure it out.

[Brief explanation of the drawing]

Figures 1A and B are perspective views showing an embodiment of the present invention, with the curtain body and curtain edge stopper separated and bonded together; Figure 2 is a conceptual diagram of the focal plane shutter; Figures 3A and B are FIG. 6 is a perspective view of a conventional curtain body and a curtain edge stopper in a separated state and an adhered state. 10, 20...Makutai, 30...Makube stop, 30
a, 30b...turning edge, 31...small hole.

Claims (1)

[Claims for Utility Model Registration] A focal film in which a curtain edge stopper having folded edges for the front and back sides of the film body is adhesively fixed to the edge of the curtain body running in front of the film surface in a direction orthogonal to the running direction. In the Rensha Ivy, a plurality of small holes for inserting adhesive were drilled in a row in the direction perpendicular to the running direction on the folded edge of the curtain edge stop, and the adhesive was applied to the inner surface of the folded edge of the curtain edge stop. Curtain body and curtain edge of a focal plane ivy, characterized in that the curtain edge stopper is adhered to the curtain body using an adhesive and an adhesive inserted into the inner surface of the folded edge through at least one of the plurality of small holes. Stop joint structure.