JPH0541032U - Moving amount detection switch - Google Patents

Abstract

(57) [Abstract] [Purpose] A rotary switch that detects the amount of movement on the detected side by rotation is constructed inexpensively with a compact and simple structure. [Structure] A rotating member 11 having a substantially conical shape is provided, which is rotated by the rotation transmitted along with the movement of the film 3a on the detected side. Conductive patterns 12 and 13 are formed on the conical surface of the rotating member along the rotation axis. Switch contact pieces 14 and 15 are provided so that the tips thereof come into contact with the conductive pattern. This allows
The rotary type movement amount detection switch 10 that detects the movement on the detected side via the rotating member by the conductive pattern is configured in a three-dimensional shape.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a rotary type movement amount detection switch having a three-dimensional shape suitable for use as, for example, a film feed amount detection switch of a camera or a forward / backward movement amount detection switch of a zoom lens.

[0002]

[Prior Art]

 For example, as a switch for detecting the feed amount of film in a camera, generally, the rotating motion of a sprocket rotated by perforation along with the running motion of the film is transmitted to a rotating disc, and the rotating disc A structure has been adopted in which a pair of switch contact pieces provided in contact with a pair of conductive patterns formed on the surface take out a signal for each rotation, and thereby calculate the film feed amount.

[0003]

[Problems to be solved by the device]

 However, in the conventional film feed amount detection switch described above, the switch is composed of a flat rotary disc and a switch contact piece that is in contact with a conductive pattern formed in the circumferential direction on the surface of the rotary disc, and the switch is attached to the switch. Since it requires a certain amount of space, there was a problem in incorporating it inside the camera.

That is, since the space inside the camera is small, and as a result, a sufficient area cannot be provided for the rotating disk, there are large restrictions on the formation of the conductive pattern and the arrangement of the switch contact pieces, resulting in troubles such as failure and malfunction. There were many

[0007] Therefore, there is a device in which rotation is guided to a place where a sufficient switch area can be secured by using a gear or the like and a switch is incorporated, but the number of constituent parts is increased, which causes a cost increase. Not only that, but there are drawbacks such as inaccurate detection of the film feed amount due to poor rotation transmission due to gear backlash, and it is desirable to take some measures to eliminate these problems. There is.

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 accurately detected, and the whole is compact and constrained. The objective is to obtain a movement amount detection switch that can be installed in a large area, has a simple structure, and is inexpensive.

[0007]

[Means for Solving the Problems]

 In order to meet such a demand, the rotary type movement amount detection switch according to the present invention includes a rotating member having a substantially conical shape which is rotated according to the rotation transmitted from the detected side, and this rotating member. Equipped with a conductive pattern formed on the conical surface along the rotation axis, and a switch contact piece that is provided in contact with the conductive pattern at its tip and detects the movement of the detected side via the rotating member by the conductive pattern. It is composed of a three-dimensional shape.

[0008]

[Action]

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

[0009]

【Example】

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

In these figures, first of all, a camera will be briefly described as a whole with reference numeral 1, and in FIG. 5, 2 is a lens barrel provided in the front center of the camera 1 and 3 is a camera barrel. A film cartridge loaded on one side, 4 is a winding spool for sequentially winding the film 3a fed from the cartridge 3, and 5 is rotationally driven by meshing with a perforation (not shown) formed in the film 3a. It is a sprocket. In the figure, reference numeral 6 is a finder portion, 7 is an autofocus portion, 8 is a speedlight portion, 9 is a film counter portion, and the other constructions are well known, and a detailed description thereof will be 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 feed amount of the film 3a, is provided on the detected side ( A rotating member 11 having a substantially conical shape that is rotated by the rotation transmitted from the sprocket 5) rotated by the film 3a, and is formed on the conical surface of the rotating member 11 around the rotation axis. A pair of conductive patterns 12 and 13 and a pair of switch contact pieces which are provided with their tips in contact with the conductive patterns 12 and 13 and which detect the movement of the film through the rotating member 11 by the conductive patterns 12 and 13. It is characterized in that it is configured to have a three-dimensional shape by 14 and 15.

In this case, a part of one conductive pattern 12 is formed by cutting, and due to the existence of the non-conductive portion 12a, as shown in FIG. 16) side, and the feeding state of the film is displayed by an appropriate display means every one 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. Further, 17 in FIG. 3 is a battery.

According to this structure, the conical surface of the rotating member 11 having a substantially conical shape that is rotated according to the feeding amount of the film 3a is used as a switch substrate for detecting the feeding amount. The conductive patterns 12, 13 formed along the conical surface and the switch contact pieces 14, 15 in contact with the conductive patterns 12, 13 detect the amount of rotation of the rotating member 11, thereby detecting the film feed amount. You can do it properly.

In particular, according to the above-described configuration, as shown in FIG. 2, the width dimensions of the switch contact pieces 14, 15 facing the conical surface are a0, a0, and the gap dimension between them is b0. , It is possible to secure a function as a contact with a sufficient margin and prevent problems such as a short circuit and improve reliability in operation. For example, when considering the bottom view shown in FIG. 3 as a conventional flat plate-shaped rotating disk, the width dimension of the switch contact pieces 14 and 15 in contact with the conductive patterns 11 and 12 formed on the surface of the rotating disk. Becomes a1, a1 (<a0), and the gap dimension between them must be considerably narrowed as shown by b1 (<b0), which may cause accidents such as shorts. From that, you can easily understand.

In other words, according to the present invention, the rotating member 11 that constitutes the switch 10 is formed in a conical shape, and the switch contact pieces 14 and 15 that are in contact with the conical surface are tilted so as to be fitted to the conical surface. Since the switch 10 is arranged, the switch 10 as a whole is made compact, and as shown in FIG. 5, the narrow space surrounded by the lens barrel 2 and the finder section 6 in the camera 1 is effectively utilized. Therefore, it can be installed without waste. Furthermore, the number of component parts is significantly reduced compared to the case where a gear or the like for changing the installation place is used as in the past, and the cost is reduced, and the width dimensions of the switch contact pieces 14 and 15 and This is advantageous in that the certain intervals can be secured and the reliability of the switch operation can be improved.

Here, the rotating member 11 having a conical shape as described above is easily obtained by molding a conventional planar substrate into a conical shape by hot pressing or injection molding with plastic. Needless to say. 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, etc. of each part of the movement amount detection switch can be appropriately modified and changed, and various modified examples can be considered.

Further, the application example of the movement amount detection switch according to the present invention is not limited to the film feeding amount detection switch 10 as described above, and for example, a camera such as a zoom lens forward / backward movement amount detection switch in the camera 1 is used. It may be applied to those that detect the movement state of each part, and it is easy to apply if it is necessary to detect the movement amount in various devices and devices in fields other than such a camera. Will be understood by.

[0019]

[Effect of the device]

 As described above, according to the movement amount detecting switch of the present invention, the rotating member having a substantially conical shape that is rotated by the rotation transmitted from the detected side and the conical surface of the rotating member are provided. A solid body provided with a conductive pattern formed around the rotation axis, and a switch contact piece provided with its tip end in contact with this conductive pattern and detecting the movement on the detected side via the rotating member by the conductive pattern. Since it is configured by the shape, despite the simple configuration, the rotating member that constitutes the switch is formed in a conical shape, and the switch contact piece that is in contact with the conical surface is arranged so as to be inclined in accordance with the conical surface. Therefore, the overall size of the switch can be made compact, the space of the switch built-in part can be effectively used, the number of component parts can be reduced, and the cost can be reduced. There is practically superior effect such can improve the reliability of the switch operation.

[Brief description of drawings]

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

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

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

FIG. 4 is a schematic exploded perspective view illustrating a configuration of a main part 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 feeding amount detection switch.

[Explanation 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)

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