JPH0524899Y2 - - Google Patents

Description

[Detailed explanation of the idea]

[Field of Application of the Invention] The present invention relates to the shape of a substrate for ensuring stable running of a blade member in a focal plane shutter device for a camera. [Background of the invention] Recently, the market has been demanding higher speeds for focal plane shutters for cameras, and as this trend has become stronger, speed irregularities due to violent and unstable movement of the shutter blades, as well as collisions and stops have become more common. This problem is becoming a big problem, especially in the tip part which is not supported by the support member, and it becomes even more serious when synthetic resin is used to reduce the weight of the blade. In response to this trend, as shown in FIG. 6, a presser plate 23 made of a thin plate of synthetic resin or metal is provided to restrict the tip of the shutter blade 22. However, as shown in FIG. 7, the presser plate 23 is greatly bent by the shutter blade 22 during the run, making the run unstable and the curtain speed disturbed. The turbulence and large deflection of the holding plate 23 caused a phenomenon in which running efficiency deteriorated. In order to improve this situation, if the driving force is increased to cope with the sliding resistance between the shutter blade 22 and the presser plate 23 or the improvement in the blade traveling speed, the amount of setting force will increase. , it was inconvenient. In addition, in order to secure a stable running space for the shutter blades 22 and prevent their increase, spacers with no numbers attached to allow the shutter blades 22 to overlap, and caulking dowels that caulk the blades and the arm are provided. Therefore, a spacer 24 provided between the holding plate 23 and the substrate 21 is required, resulting in an increase in the number of parts. Moreover, as shown in FIG.
If the spacer is bent, the spacer becomes unstable, and the movement of the shutter blade 22 becomes even more unstable. [Purpose of the invention] In view of the above-mentioned disadvantages, the purpose of the invention is to reduce irregularities and irregular adjustments in shutter speed, without increasing the number of parts, and without increasing sliding resistance or setting power. It is an object of the present invention to provide a substrate for a focal plane shutter device that does not cause an increase in occlusion. [Structure of the invention] The above-mentioned object includes a substrate, a blade member made of a thin plate divided into a plurality of sheets, and a blade operating member whose one end is supported by the substrate and whose other end supports the blade member. In the focal plane shutter device, the substrate is on the tip side of the blade member,
This is achieved by integrally forming a portion that is higher than other portions in order to ensure a space during overlapping and traveling of the blade members and to provide guidance. [Embodiment of the invention] An embodiment of the invention will be described below with reference to the drawings. FIG. 1 is a plan view of a substrate of a shutter device showing an embodiment of the present invention. FIG. 2 is a sectional view taken along line AA in FIG. 1. 3 and 4 are explanatory diagrams of the operation of this embodiment. Reference numeral 1 denotes a substrate that forms an imaging opening 2, a reference surface 3, and a high surface 4, and includes an inclined surface 3a connecting the imaging opening 2 and the reference surface 3, and a slope 3a connecting the imaging opening 2 and the reference surface 3;
A slope 4a connecting the two is formed. Reference numeral 5 denotes a protrusion, which is integrated with the substrate 1 and has a portion 5a on which the upper end of the intermediate plate, which will be described later, is placed and a penetrating portion 5b.
It is planted to have a Reference numeral 6 denotes a protrusion, which is formed and erected integrally with the substrate 1 in order to place the lower end of an intermediate plate to be described later. 7 and 7' are shafts that support one end of each of first and second operating arms (not shown) that support a group of leading blades, which will be described later. It has a ring 8 made of metal or synthetic resin on its circumferential surface. Note that the arrangement of the rings 8 may of course be increased or decreased as appropriate depending on the degree of wear. Reference numeral 9 denotes a leading blade group, which is composed of a thin plate divided into a plurality of sheets, and travels over the photographing aperture 2 while being supported by first and second operating arms (not shown) to perform exposure and light shielding. Reference numerals 10 and 10' denote shafts that support one end of each of first and second operating arms (not shown) that support rear blade groups, which will be described later. Alternatively, it has a ring 11 made of synthetic resin around it. As with the annular ring 8, the arrangement of the annular ring 11 may be increased or decreased as appropriate depending on the degree of wear. Reference numeral 12 denotes a rear blade group, which is also composed of a thin plate divided into a plurality of sheets, and travels over the photographing aperture 2 while being supported by an operation arm (not shown) to perform exposure and light shielding. 13 is an intermediate plate arranged so that the leading blade group 9 and the trailing blade group 12 do not interfere with each other. The embodiment of the present invention has the above-mentioned configuration, and its operation will be described below. FIG. 3 shows the shutter set state,
FIG. 4 is a schematic sectional view showing a state in the middle of shutter operation. First, in the state shown in FIG. 3, the leading blade group 9 is spread out to cover the entire surface of the photographing opening 2 and block light. Here, when the release is performed by a well-known release mechanism on the camera body side, the operating arms (not shown) use the shafts 7 and 7' as fulcrums, and at least one of the operating arms enters the unnumbered arc-shaped hole. The leading blade group 9 starts traveling from bottom to top in the drawing. As shown in FIG. 4, during this operation, the tip end side of the shutter leading blade group 9 is guided by the high surface 4 that is firmly formed integrally with the base plate 1. The holding plate 23 is not distorted and can run stably.

[Other Examples]

FIG. 5 shows a second embodiment. For ease of understanding, the same numbers as in the first embodiment are given. The shape of the high-level surface 4 that is integrated with the substrate 1 is
Nearby, a slope is formed whose height is lower than the upper and lower parts. This is because, whereas in the first embodiment, the slope is formed in a substantially U-shape except for the tip of the blade around the photographing opening, the tip can run more smoothly. becomes. FIGS. 8 and 9 show a third embodiment. In this embodiment, when forming the substrate 1, a bent portion 30 is provided around the substrate 1 including the high portion 4 integrally therewith. By integrally forming the bent portions 30 around the entire circumference or at necessary portions as described above, it is possible to prevent light leakage from the surroundings.

[Effect of the idea]

As mentioned above, by implementing the present invention, there is no need to use a holding plate or a spacer on the substrate side as in the conventional case, and therefore, the vibration of the blades that is increased due to the bending of the holding plate is eliminated. Not only is the irregularity of the curtain speed and the resulting reduction in running efficiency fundamentally eliminated, but the higher surface and the protrusion are integrally formed on the substrate, and the relationship between the substrate surface, the higher surface, and the protrusion surface is improved. is always kept constant, so while the shutter blade is running, the running space is ensured without being hindered, and there is almost no loss in blade running speed, and therefore the setting force is smaller. be able to. In this way, it is possible to obtain a substrate for a focal plane shutter device that can fundamentally eliminate the conventional disadvantages and also reduce the number of parts.
The effect is huge.

[Brief explanation of drawings]

FIG. 1 is a plan view of a substrate of a shutter device showing a first embodiment of the present invention. Figure 2 shows the first
3 and 4 are cross-sectional views taken along line A-A in the figure.
5 is a sectional view showing the second embodiment of the present invention, FIGS. 6 and 7 are sectional views showing the conventional example, and FIGS. 8 and 9 are explanatory views of the operation. FIG. 2 is a plan view and a cross-sectional view of a main part of a third embodiment of the present invention. 1...Substrate, 2...Photographing opening, 3...Reference plane, 4...High plane, 5, 6...Protrusion, 7, 7'...
...shaft, 8...circle, 9...leading blade group, 10,1
0'...shaft, 11...circle, 12...rear blade group,
13...Intermediate plate, 15...Intermediate portion, 30...Bending portion.

Claims (1)

[Scope of Claim for Utility Model Registration] (1) A substrate having an opening for photographing, a blade member consisting of a thin plate divided into a plurality of pieces, which runs over the opening and opens and closes it, and one end of which is connected to the opening. In the substrate of the focal plane shutter device, the substrate is supported by a substrate and includes a blade operating member whose other end supports the blade member, wherein the substrate is operated by overlapping, scanning, and spreading the tip side of the blade member. In the area occupied,
A higher surface substantially parallel to the traveling surface of the blade member and thicker than the reference surface and a protrusion portion thicker than the higher surface are integrally formed to allow the traveling movement of the blade member not to be inhibited. A substrate for a focal plane shutter device characterized by having a space. (2) A substrate for a focal plane shutter device, characterized in that the substrate is integrally provided with a bending portion for light shielding at its periphery.