JP2550863Y2 - Moving distance detection switch - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rotary type moving amount detecting switch having a three-dimensional shape suitable for use as, for example, a film feeding amount detecting switch of a camera or a zoom lens moving amount detecting switch.

[0002]

2. Description of the Related Art Conventionally, as a switch for detecting a film feed amount in a camera, a rotation operation of a sprocket rotated by perforation along with a running operation of a film is generally transmitted to a rotating disk.
A structure is adopted in which a signal for each rotation is taken out by a pair of switch contact pieces provided in contact with a pair of conductive patterns formed on the surface of the rotating disk, and the film feed amount is calculated and obtained thereby. I was

[0003]

However, in the above-described conventional film feed amount detecting switch, the above-mentioned conventional film feed amount detecting switch has a flat rotating disk and a switch contact piece which is in contact with a conductive pattern formed on the surface in a circumferential direction. This requires a certain amount of installation space, and thus poses a problem in assembling it inside the camera.

That is, since the space inside the above-mentioned camera is small and the rotating disk cannot have a sufficient area, there are great restrictions on the formation of the conductive pattern and the arrangement of the switch contact pieces, and troubles such as failures and malfunctions occur. There were many.

For this reason, there has been a device in which a switch is incorporated by using a gear or the like to guide the rotation to a place where a sufficient switch area can be secured, but the number of components increases, which only causes an increase in cost. In addition, there is a drawback that the detection of the feed amount of the film becomes inaccurate due to a rotation transmission failure due to a gear backlash or the like, and it is desired to take some measures to eliminate these problems.

The present invention has been made in view of such circumstances, and when the movement on the detected side is transmitted by rotation, this can be detected with high accuracy, and the whole is compact and has large restrictions. It is an object of the present invention to obtain a movement amount detection switch that can be incorporated in a place, has a simple structure, and is inexpensive.

[0007]

SUMMARY OF THE INVENTION In order to meet such a demand, a rotary type moving amount detection switch according to the present invention has a substantially conical shape which is rotated with the rotation transmitted from the detected side. A rotating member, a conductive pattern formed along a rotation axis on a conical surface of the rotating member, and a tip end portion provided in contact with the conductive pattern, the movement of the detected side through the rotating member by the conductive pattern. And a switch contact piece to be detected.

[0008]

According to the present invention, in a rotating member having a substantially conical shape which is rotated in accordance with the movement on the detected side, a rotating pattern is formed by a conductive pattern formed along the conical surface and a switch contact piece in contact with the conductive pattern. The amount of rotation of the member is detected, whereby the amount of movement on the detected side can be detected.

[0009]

1 to 5 show an embodiment of a movement amount detecting switch according to the present invention. In this embodiment, a moving amount detecting switch according to the present invention is used for detecting a film feed amount in a camera. The case where the present invention is used for a switch will be described.

[0010] In these figures, first, the whole is denoted by reference numeral 1.
The camera will be briefly described with reference to FIG. 5. In FIG. 5, reference numeral 2 denotes a lens barrel provided at the front center of the camera 1, reference numeral 3 denotes a film patrone mounted on one side of the camera, and reference numeral 4 denotes a patrone from the patrone 3. A take-up spool 5 for sequentially winding the fed film 3a is a sprocket that is driven to rotate by meshing with a perforation (not shown) formed on the film 3a. In the figure, 6 is a finder section, 7 is an autofocus section, 8 is a speedlight section, 9 is a film counter section, and other configurations are well known, and detailed description thereof is omitted.

According to the present invention, in the camera 1 as described above, the film feed amount detection switch 10, which is a movement amount detection switch for detecting the film feed amount of the film 3a, is connected to the detection side (film). A rotating member 11 having a substantially conical shape that is rotated with the rotation transmitted from the sprocket 5) rotated by 3a, and a pair of rotating members 11 formed on the conical surface of the rotating member 11 along the rotation axis. The conductive patterns 12 and 13 and these conductive patterns 1
2 and 13 are provided with their tips in contact with each other.
It is characterized in that the switch 13 has a three-dimensional shape by a pair of switch contact pieces 14 and 15 for detecting the movement of the film via the rotating member 11.

In this case, a part of one conductive pattern 12 is cut and formed. Due to the presence of the non-conductive portion 12a, as shown in FIG. 16), and the film feed state is displayed by an appropriate display means for each rotation of the rotating member 11. It is preferable that one rotation of the rotating member 11 corresponds to one frame feed of the film 3a. Reference numeral 17 in FIG. 3 denotes a battery.

According to such a configuration, the conical surface of the rotating member 11 having a substantially conical shape which is rotated according to the feed amount of the film 3a can be used as a switch board for detecting the feed amount. The amount of rotation of the rotating member 11 is detected by the conductive patterns 12 and 13 formed along the conical surfaces and the switch contact pieces 14 and 15 in contact with the conductive patterns 12 and 13 so that the film feeding amount can be appropriately detected. .

In particular, according to the configuration described above, FIG.
As shown in (1), the widths of the switch contact pieces 14 and 15 facing the conical surfaces are a0 and a0, and the gap between them is b0 so that a sufficient margin can be secured and the function as a contact can be secured. Problems such as short circuits can be prevented, and reliability in operation can be improved. This is because, for example, when the bottom view shown in FIG. 3 is considered as a conventional flat rotating disk, the switch contact pieces 14 that come into contact with the conductive patterns 11 and 12 formed on the surface thereof.
The width of 15 is a1, a1 (<a0), and the gap between them must be considerably narrowed as shown by b1 (<b0), which may cause an accident such as a short circuit. It will be easy to understand.

In other words, according to the present invention, the switch 1
0 is formed in a conical shape, and the switch contact pieces 14 and 15 that are in contact with the conical surface are arranged obliquely in accordance with the conical surface.
0 as a whole, and as shown in FIG.
A narrow space surrounded by the lens barrel 2, the finder section 6, and the like in the camera 1 can be effectively utilized and can be incorporated without waste. Further, the number of components is greatly reduced as compared with the case of using a gear or the like for moving the mounting place as in the conventional case, the cost is reduced, and the width of the switch contact pieces 14 and 15 and the distance between them are reduced. This is advantageous in that it can be taken sufficiently and the reliability of the switch operation can be improved.

Here, the rotating member 11 having a conical shape as described above can be easily obtained by molding a conventional planar substrate into a conical shape by hot pressing or the like, or by injection molding with plastic. It goes without saying that. In the latter case of injection molding, the conductor portion (conductive pattern) may be provided by insert molding or the like.

It should be noted that the present invention is not limited to the structure of the embodiment described above, and the shape, structure and the like of each part of the movement amount detection switch can be appropriately modified and changed, and various modifications can be considered.

Further, the application example of the movement amount detection switch according to the present invention is not limited to the film feed amount detection switch 10 as described above. It may be applied to those that detect the motion state of various devices in various fields other than such a camera,
It will be easily understood that the present invention can be applied to any device that needs to detect the amount of movement.

[0019]

As described above, according to the movement amount detection switch according to the present invention, a rotating member having a substantially conical shape that is rotated with the rotation transmitted from the detected side;
A conductive pattern formed on the conical surface of the rotating member along the rotation axis, and a switch contact provided at the tip end thereof in contact with the conductive pattern and detecting movement on the detection side via the rotating member by the conductive pattern Since it was constituted by a three-dimensional shape comprising a piece, the rotating member constituting the switch was formed in a conical shape despite the simple configuration,
In addition, the switch contact piece in contact with the conical surface is arranged to be inclined according to the conical surface, so that the entire switch can be made compact, the space for the switch assembly can be used effectively, and the number of component parts can be reduced. There are practically excellent effects such as reduction in cost, reduction in cost, and improvement in reliability of switch operation.

[Brief description of the drawings]

FIG. 1 is a front view of a main part showing an embodiment of a movement amount detection switch according to the present invention.

FIG. 2 is a schematic side view of FIG. 1 as viewed from the side.

FIG. 3 is a schematic bottom view of FIG. 1 as viewed from the direction of arrow III.

FIG. 4 is a schematic exploded perspective view for explaining a main configuration of the present invention.

FIG. 5 is a schematic front view of a camera for explaining a case where the movement amount detection switch according to the present invention is applied to a film feed amount detection switch.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Camera 3a Film 5 Sprocket 10 Film feed amount detection switch (movement amount detection switch) 11 Rotating member having a substantially conical shape 12 Conductive pattern 13 Conductive pattern 14 Switch contact piece 15 Switch contact piece

Claims (1)

(57) [Scope of request for utility model registration] 1. A rotary movement amount detection switch in which a movement on a detected side is transmitted by rotation, comprising: a rotating member having a substantially conical shape that is rotated with the rotation from the detected side; A conductive pattern formed on the conical surface of the rotating member along the rotation axis; and a switch contact piece provided with the leading end thereof in contact with the conductive pattern and detecting the movement of the detected side via the rotating member by the conductive pattern. And a movement amount detection switch.