JPH0854255A - Electric conductive mechanism - Google Patents

Abstract

PURPOSE:To facilitate the positioning of the electric conductive member and an electric contact and to achieve a simplification of assembling by providing a non-electric conductive part of another electric conductive member with a conductive part of at least one electric conductive member. CONSTITUTION:A cord plate 80 has a group of electric conductive members 81 and 82 and a group of those 83 and 84 as formed on an insulation substrate 801 being separated from each other in the direction of relative movement thereof. On the other hand, electric contacts 851 and 852 and 871 and 872 corresponding to the members 81-84 are fixed on focus adjusting pieces 35a and 35b to have a continuity with a lead. A boundary position of zones 4 and 5 to be detected with the member 82 is detected with a conductive land part 823 provided between conductive land parts 841 and 842 of the member 84. In the land part 823, a switching rim part 823b coincides with the boundary of the zones 4 and 5 while a switching rim part 823a is separated from the rim part 823b so as not to be interfered with the land part 823. On the other hand, the switching rim part 821a is offset within the zone 4 from the boundary of the zones 4 and 5.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electrical conduction member and an electrical conduction mechanism such as a switch and an encoder using an electrical contact piece slidably contacting the electrical conduction member.

[0002]

2. Description of the Related Art In recent cameras, as a means for detecting the focal length of a zoom lens or the subject distance, a cord plate having conductive / non-conductive lands as an electrically conductive member on its surface, and this cord An electrical conduction mechanism using an electrical contact piece (brush) that slidably contacts the conductive / non-conductive land on the plate is used.

FIG. 5 shows an example in which an electrical conduction mechanism is applied, which is an interchangeable lens (zoom lens) 10 of a single-lens reflex camera.
It is a figure which shows the structure of. An outer fixed cylinder 12 is fixed to the detachable mount 11, and a linear guide cylinder 13 is fixed to the outer fixed cylinder 12. These are fixed members of the zoom lens 10.

The straight guide tube 13 is provided for the front lens group L1,
Straight guide grooves 14 and 15 in the optical axis direction for the rear lens group L2 are formed. Rear group frame 17 holding the rear group lens L2
Is provided with a cam roller 19 protruding outward in the radial direction, and the cam roller 19 is fitted in the linear guide groove 15. A cam ring 20 is rotatably fitted on the outer circumference of the linear guide cylinder 13. The cam roller 19 of the rear group frame 17 fitted in the straight guide groove 15 is fitted in the cam ring 20 at the same time.

On the other hand, on the outer periphery of the front part of the cam ring 20, a front group moving barrel 24 is fitted so as to be relatively rotatable, and a cam roller 25 projecting radially inward from the front group moving barrel 24,
It is fitted in the cam groove 21 of the cam ring 20 and the straight guide groove 14 penetrating the cam groove 21. A focusing ring 26, which can be rotated from the outside, is screwed onto the outer periphery of the front group moving barrel 24 with a screw 27.
The above-described front group frame 16 is fixed to 6 via a retaining ring 28.

A zoom ring 30, which can be rotated from the outside, is fitted on the outer periphery of the outer fixed barrel 12. The zoom ring 30 and the cam ring 20 are connected by a connecting pin 31 in the radial direction.
It always makes the same rotation. The connecting pin 31 is the outer fixed cylinder 1.
2 through the circumferential elongated hole 32, the circumferential elongated hole 32,
It has a width in the optical axis direction that allows a certain amount of movement of the coupling pin 31 in the optical axis direction. Therefore, when the zoom ring 30 is rotated, the cam ring 20 is integrally rotated via the coupling pin 31, and as a result, the cam grooves 21 and 22 and the linear guide groove 1 are rotated.
According to Nos. 4 and 15, the rear group frame 17 (rear group lens L2)
And the front group moving barrel 24 (that is, the focusing ring 26,
The front group frame 16 and the front group lens L1) are moved in the optical axis direction for zooming. Further, when the focusing ring 26 is rotated, the front group frame 16 (front group lens L1) moves in the optical axis direction according to the screw 27, and focus adjustment is performed.
Further, when the focusing ring 26 is rotated, the screw 27
Accordingly, the front group frame 16 (front group lens L1) moves in the optical axis direction to perform focus adjustment.

In the zoom lens 10 described above, when the position of the cam ring 20 in the optical axis direction is adjusted, the entire front lens group L1 and the rear lens group L2 move in the optical axis direction. Therefore, by adjusting the position of the cam ring 20 in the optical axis direction, the back focus at the time of assembly can be adjusted. As this back focus adjusting means, a focus adjusting piece (optical axis direction moving member) 35 is provided. This focus adjustment piece 3
5 is supported on the outer fixed barrel 12 so as to be able to move straight in a direction parallel to the optical axis, and a long hole 36 extending in a direction parallel to the optical axis is formed on the peripheral surface thereof.

The focus adjustment piece 35 is fixed to the outer fixed barrel 12 by a fixing screw 39 which penetrates the elongated hole 36 and has a tip screwed into the outer fixed barrel 12. Therefore, the focus adjustment piece 35 can be adjusted in position in the direction parallel to the optical axis within the range of the effective length of the elongated hole 36 by loosening the fixing screw 39. An inward flange 38 is formed at the front end of the focus adjustment piece 35 so as to pass through the notch 37 in the outer fixed barrel 12 and face the outer fixed barrel 12. This inner flange 3
8, a circumferential groove 40 is formed, and the circumferential groove 40 is fitted in a circumferential projection 41 formed on the cam ring 20 so as to be rotatable relative to each other without a gap. The focus adjustment piece 35 is
Another is provided at a position symmetrical to the optical axis.

An electrical conduction mechanism is used as a focal length detecting means for detecting the rotational position of the cam ring 20, that is, the focal length that changes due to zooming. This electrical conduction mechanism includes four brushes 651, 652, 653 attached to the code plate 60 made of a flexible printed board and the focus adjustment piece 35, which are provided on the cam ring 20.
654.

When the cam ring 20 is rotated around the optical axis, zooming is performed, and depending on the rotating position of the cam ring 20, the above-mentioned 4
Two brushes emit ON / OFF signals and output focal length information that changes with zooming in 4 bits. The focal length detection circuit 51 detects the focal length from this 4-bit signal and sends it to the control circuit of the camera body for use in calculating the open F value, displaying focal length information, and the like.

FIG. 5 is a diagram showing a main part of an electrical conduction mechanism used in the focal length detecting means of the zoom lens. As shown in the figure, the focal length detecting means is a cam ring 20 that is rotationally driven to change the focal length, and a focus adjustment provided on the side of the outer fixed barrel 12 (see FIG. 6) facing the cam ring 20. And a piece 35.

A code plate 60 shown in FIG. 4 is fixed to the outer peripheral surface of the cam ring 20. In this conventional example, the code plate 60 is used in order to detect the focal length by 3-bit data.
On the flexible insulating plate 601 of the four electrically conducting members 61, 62, 63, 6 extending in the rotation direction of the cam ring 20.
4 are provided.

The electrically conducting members 61, 62 and 63 are provided with conducting land portions 611, 621 and 631, respectively, and the electrically conducting member 64 is provided with two conducting land portions 641 and 642 connected by lead portions 643. ing. Four electric contact pieces 651, 652, 653, 6 of the electric contact piece group 65
54 is each of these conductive land portions 611, 621, 63.
Sliding contact with 1, 641 and 642 independently. Note that one conductive land portion 611 continuously extends so that the electrical contact piece 651 always contacts (electrically conducts) regardless of the rotational position of the cam ring 20, and is grounded. Other conductive land portions 611, 621, 631, 641 and 6
42 is formed with a length that matches the length of the zones so that the rotational position of the cam ring 20 can be detected in the eight zones 1-8.

With the above configuration, the electric contact pieces 652, 65
3, 654 are conductive land portions 621, 631, 641, 6
Upon contact with 42, the electrically conducting members 62, 63, 64 are brought into conduction (on) with the electrically conducting member 61 to bring the potential to the ground level, and when not in contact, the electrically conducting member 6
2, 63 and 64 are not electrically connected to the electrically conductive member 61 (off)
State. Therefore, in FIG. 4, in zone 1, the electrically conducting portion 62 is turned on, in zone 2, the electrically conducting portions 62, 64 are turned on, and in zone 3, the electrically conducting portion 62, 64.
63 and 64 are turned on, and in zone 4, the electrical conduction portion 62,
63 is turned on, the electrically conducting portion 63 is turned on in the zone 5, the electrically conducting portions 63 and 64 are turned on in the zone 6, the electrically conducting portion 64 is turned on in the zone 7, and the electrically conducting portion 64 is turned on in the zone 8. 62, 63, 64 are all off.

When the cam ring 20 is rotated here, relative movement in the arrow direction occurs between the cam ring 20 and the support member 69 in FIG. 4, and the electrical contact pieces 652, 653, 654 are shown.
, The conductive land portions 621, 631, 641, 642
An ON / OFF state is formed by connecting and disconnecting with, and a 3-bit signal is output. Each of these electrical conducting members 62, 63, 64
By inputting the potential of the above into the focal length detection circuit 51 (FIG. 5 or FIG. 6), the focal length detection circuit 51 determines the rotational position of the cam ring 20 by the combination of the electric potential states of the electrical conducting members 62, 63, 64. In other words, the focal length is set to the conductive land portion 6
21, 631, 641, 642 in zones, switching edges 621a, 631a, 631b, 641a, 6
41b, 642a, 642b can be detected with a specific value.

In order to improve the detection accuracy in the above-mentioned conventional example, the positions of the four conductive land portions 621, 631, 641, 642 of the three electrically conductive portions 62, 63, 64 at the ends in the relative movement direction, Is accurately formed, and the three electric contact pieces 652, 653, 654 are connected to the conductive land portion 621,
The positions of contact with 631, 641 and 642 must be accurately formed. When these are mounted, the inclination of the cord plate 60 and the electrical contact piece group 65, the three electrical contact pieces 652, 653, 654 are connected to the conductive land portions 621, 63.
It is necessary to accurately adjust the positions of contacting and separating with 1, 641 and 642. Therefore, as the number of bits, that is, the number of electrically conductive portions and electrical contact pieces, increases, the accuracy of the above-mentioned formation and adjustment must be increased, and moreover, the number of adjustment points increases.

Further, in the above-mentioned conventional example, since the plurality of electrically conducting members 61, 62, 63, 64 and the plurality of electrical contact pieces 65 are provided in parallel in the direction orthogonal to the relative movement direction, the code plate 60 and the electrical components are provided. The width of the contact piece 65 in the orthogonal direction becomes wider. Therefore, when the space in the orthogonal direction is limited, there is a problem that the number of electrically conducting portions, that is, the number of bits is limited.

As a solution to this problem, the applicant of the present invention has proposed an electrical conduction mechanism shown in FIG. 2 in Japanese Utility Model Publication No. 6-28631. This is an electrically conductive member 71, 72,
73 and 74 are divided into a group of electrically conducting members 71 and 72 separated from each other in the relative movement direction, and two groups of electrically conducting members 73 and 74, and the electrical contact piece is also a group of electrical contact pieces 751 and 752. It is characterized in that it is divided into two groups, electric contact pieces 771 and 772. The first electrically conductive member 71 includes a conductive land portion 711 that contacts the electrical contact piece 751 regardless of the rotational position of the cam ring 20. The second electrically conductive member 72 includes a conductive land portion 721 that comes into contact with the electrical contact piece 752 in the zones 1, 2, 3 and 4. The third electrically conductive member 73 includes a conductive land portion 731 that makes electrical contact with the electrical contact piece 771 in the zones 3 to 6. The fourth electrical conduction member 74 includes an electrical contact piece 772, a conduction land portion 741 that makes electrical contact in the zones 2 and 3, and a conduction land 742 that makes electrical contact in the zones 6 and 7.

Electrical contacts 751, 752, 771, 772
Are electrically connected to each other, and the first electrically conductive member 71 with which the electrical contact piece 751 is constantly in contact is grounded. Therefore, other electrical contacts 752, 771, 772
Contact the conductive land portions 721, 731, 741, 742, the second to fourth electrical conductive members 72 to 74 are brought into a ground (ON) state, and the conductive land portions 721, 731, 74.
When the first and second 742 are not in contact with each other, the second to fourth electrical conduction members 72 to 74 are in a floating (off) state. A 3-bit signal is obtained by turning on / off the second to fourth electrical conducting members 72 to 74. By thus forming the electrically conductive members 71 to 74 in a two-row, two-group configuration, it is possible to narrow the width of the code plate 70, and increase the number of bits if the same space is used. You can

However, in the above structure, the electric contact piece 751,
The relative positions of 752 and the electrical contact pieces 771, 772 must be set accurately. That is, as shown in FIG.
The length d ₁ from the electrical contact piece 752 to the switching edge 721a of the conductive land 721 which is the boundary between the fourth and fifth zones.
Must be adjusted to be equal to the length d ₂ from the electric contact piece 772 to the boundary position of the fourth and fifth zones. That is, when a plurality of electric contact piece groups are present separately, for example, first, one electric contact piece group is accurately positioned and fixed, and then the positional relationship between this electric contact piece group and the electrical conducting member is determined. As a reference, the position of the other electrical contact group must be adjusted.

[0021]

SUMMARY OF THE INVENTION It is an object of the present invention to solve the above problems, and to provide a structure in which the electrical conducting member and the electrical contact piece can be easily positioned in the electrical conducting mechanism and which can be easily assembled. I am trying.

[0022]

SUMMARY OF THE INVENTION An electrical contact mechanism of the present invention is an electrical contact member mounted on one member of two members that move relative to each other and an electrical contact member mounted on the other member and slidably contacting the electrical member. An electrical conduction mechanism having a piece, a substrate in which a plurality of electrical conduction members having a combination of a conduction portion and a non-conduction portion extending in the relative movement direction are arranged in parallel,
A plurality of electrical contact pieces that form a conductive / non-conductive state by contacting a conductive portion / non-conductive portion on the substrate according to the relative movement position for each electrically conductive member of each row, At least the conductive portion of the one electrically conductive member is provided in the non-conductive portion of the other electrically conductive member.
The present invention according to claim 2 is a conduction part extending in a specific direction.
A plurality of electrically conducting members arranged in parallel and composed of a combination of electrically non-conducting members, which relatively move in a specific direction between the electrically conducting member group, and each of the electrically conducting members and non-conducting members depending on the moving position. An electrical conduction mechanism having a plurality of electrical contact pieces that come into contact with each other to form a conductive / non-conductive state for each electrical conductive member, wherein the plurality of electrical conductive members and corresponding electrical contact pieces are It is characterized in that it is divided into two or more groups separated from each other in the relative movement direction, and that the conductive portion of the electrically conductive member of the one group is transferred to the non-conductive portion of the electrically conductive member of the other group.

[0023]

BEST MODE FOR CARRYING OUT THE INVENTION The present invention will be described below with reference to illustrated embodiments. FIG. 1 is a diagram showing a first embodiment of the electrical conduction mechanism of the present invention. The first embodiment is an embodiment in which the electrically conducting member is provided separately in the moving direction.

The code plate 80 is an electrically conductive member 81 formed on the insulating substrate 801 so as to be separated from each other in the relative movement direction.
The group of 82 and the group of electrically conductive members 83 and 84 are provided. On the other hand, these electrically conducting members 81, 82, 83,
84 corresponding electrical contact pieces 851, 852, 871, 87
Reference numeral 2 is fixed to the focus adjusting pieces 35a and 35b, and is electrically connected by a lead (not shown). The code plate 80
Is formed of a flexible printed circuit board,
The focus adjusting pieces 35 a and 35 b are wound around and fixed to the outer circumference of the cam ring 20 of the lens barrel shown in FIG. 5, and the focus adjusting pieces 35 a and 35 b are fixed to the outer fixed barrel 12.

The first electrically conductive member 81 has a continuous electrically conductive land portion 811, the second electrically conductive member 82 has two electrically conductive land portions 821 and 823, and the third electrically conductive member 81. The electrically conductive member 83 has an electrically conductive land portion 831, and the fourth electrically conductive member 84 has two electrically conductive land portions 841 and 842. Of these, the first
The electrical conducting member 82 is grounded, and the electrical contact piece 851 is always in contact with the conducting land portion 811. Then, the conductive land portions 821, 823, 831, 841, 842 of the remaining three electrically conductive members 82, 83, 84 are brought into contact with and separated from the electrical contact pieces 852, 871, 872, and 3-bit on / off information is transferred to the focal length. It is sent to the detection circuit 51. The focal length detection circuit 51 detects the rotational position of the cam ring 20, that is, the focal length of the zoom lens 10, based on the on / off information. This action is the same as the conventional example.

In the first embodiment, the second electrically conducting member 8
2 is turned on in the zones 1 to 4, and the third electrically conductive member 83
Is turned on in zones 3 to 6, and the fourth electrically conductive member 84 is turned on in zones 2 and 3 and zones 6 and 7.

Zones 1-8 and electrically conducting members 82, 8
The following is a comparison table in which 3,84 on / off information is 3-bit binary coded.

[Table 1] In the table, the symbol “/” indicates that they overlap, and the symbol “−” indicates the non-conducting portion.

The feature of the electrical conduction mechanism of the illustrated embodiment is that the boundary position of the zones 4 and 5 to be detected by the second electrical conduction member 82 is determined by the conduction land portion 84 of the fourth electrical conduction member 84.
The detection is performed by the conductive land portion 823 provided between the first and second parts 842. That is, as shown in FIG. 1, the conductive land portion 823 of the second electrically conductive member 82 is moved from the position indicated by the imaginary line to the conductive land portion 83 of the third electrically conductive member 83.
It is characterized in that it was relocated between 1, 832. In the conductive land portion 823, the switching edge portion 823b coincides with the boundaries of the zones 4 and 5, and the switching edge portion 823a.
Are separated from the switching edge portion 823b so as not to interfere with the conduction land portion 823. On the other hand, the conductive land portion 8
The switching edge portion 821a of 21 does not have a function of detecting the boundary of the zone, and is therefore offset from the boundary of the zones 4 and 5 into the zone 4. This offset amount is
The length of the conductive land portion 823 is set shorter than the length of the conductive land portion 823 so as to overlap with the conductive land portion 823. Of course, the electrical contact piece 872 is in sliding contact with the conductive land portion 823.

Next, the characteristics of the detection operation of this embodiment will be described. In the state shown in FIG. 1, it is detected that the second and fourth electrically conducting members 82 and 84 are off and the third electrically conducting member 83 is on to form the code “010”, and that it is in the zone 5. are doing. From this state, the cam ring 20 is in zone 1
When moving in the direction, first, the electrical contact piece 872 comes into contact with the switching edge portion 823b of the conductive land portion 823, the second electrical conductive member 82 is turned on, and the code changes to “110”. The focus detection circuit 51 detects that the cam ring 20 is at the boundary position between the zones 4 and 5 based on this change.

When the cam ring 20 rotates in the zone 1 direction from this boundary position, the electrical contact piece 852 causes the conductive land portion 821.
Although the electric contact piece 872 is still in contact with the conductive land portion 823, the cord remains unchanged at “110” and it is detected that it is in the zone 4. .

The cam ring 20 is placed in the zone 1 in the zone 1.
When the electric contact piece 872 is rotated in the direction
3, the electrical contact piece 852 is not connected to the conductive land portion 821.
Since it is in contact with, the code remains unchanged at "110" and it is detected that it is in zone 4.

Further, the cam ring 20 moves within the zone 4 into the zone 1
When the electric contact piece 872 is rotated in the direction,
The first electrical contact member 84 comes into contact with the switching edge portion 841b of No. 1 and the code is changed from "110" to "11".
The focus detection circuit 51 detects that the cam ring 20 is at the boundary position between the zones 3 and 4 due to this change.

Similarly, when the cam ring 20 rotates in the same direction,
Each zone and zone switching are detected by the same operation as described above. On the other hand, even when the cam ring 20 rotates in the opposite direction, the boundary between the zones 4 and 5 is detected by the switching edge portion 923b of the electrical contact piece 954 and the conductive land portion 923.

As described above, the second electrically conductive member 82 does not need to detect the boundaries between the zones 4 and 5, and the electrical contact piece and the electrically conductive member are positioned by one of the electrical contact piece groups 8
7 and the electrical conducting members 83 and 84, and the other electrical contact piece group 85 is not a problem even if it is slightly displaced.

FIG. 3 shows an embodiment in which the present invention is applied to the conventional example shown in FIG. 4, which extends parallel to the relative movement direction.
This is a configuration in which all the electrically conducting members 91, 92, 93, 94 of the book are arranged in parallel. The code plate 90 includes the electrically conductive members 91, 92, 93, which are formed in parallel on the insulating thin plate 901.
It is equipped with 94. On the other hand, these electrically conducting members 91,
Electrical contacts 951, 952 corresponding to 92, 93, 94,
953 and 954 are fixed to the focus adjustment piece 35. The electrical cord plate 90 is wound around and fixed to the outer periphery of the cam ring 20 of the lens barrel shown in FIG. 3, and the focus adjustment piece 35 is fixed to the outer fixed barrel 12.

The first electrically conductive member 91 has a continuous electrically conductive land portion 911, and the second electrically conductive member 92 has two electrically conductive land portions 921 and 923.
The third electrically conductive member 93 has one electrically conductive land portion 931 and the fourth electrically conductive member 94 has two electrically conductive land portions 941 and 942. Of these, the first
The electrically conductive member 92 is grounded, and the electrically conductive land portion 91 is provided.
An electric contact piece 951 is always in contact with the first terminal 1. The remaining three electrically conductive members 92, 93, and 94 have conductive land portions 921, 923, 931, 941, 942,
3-bit on / off information is formed by contacting / separating with the electrical contact pieces 952, 953, 954, and the rotational position of the cam ring 20, that is, the focal length of the zoom lens 10 is detected by the focal length detection circuit 51 by this information. It This action is the same as in the first embodiment. In the second embodiment, similarly to the first embodiment, the second electrically conductive member 92 is turned on in the zones 1 to 4, and the third electrically conductive member is turned on in the zones 3 to 6,
The fourth electrically conductive member 94 is configured to turn on in the zones 2 and 3 and the zones 6 and 7.

The feature of the second embodiment is that the boundary positions of the zones 4 and 5 to be detected by the second electrically conducting member 92 are provided between the electrically conducting lands 941 and 942 of the fourth electrically conducting member 94. The conductive land portion 923 is used for detection. That is, as shown in FIG. 3, the conductive land portion 923 of the second electrically conductive member 92 is changed from the hatched position to the fourth position.
It is characterized in that it is transferred between the conductive land portions 941 and 942 of the electrically conductive member 94. This conductive land portion 9
23, the switching edge 923b coincides with the boundaries of the zones 4 and 5, and the switching edge 923a does not interfere with the conductive land 941.
And are separated. On the other hand, the switching edge portion 921 a of the conductive land portion 921 is offset in the zone 4 from the boundary between the zones 4 and 5. This offset amount is set to be shorter than the length of the conductive land portion 923, that is, to be overlapped. Of course, the conductive land portion 92
An electric contact piece 954 is slidably contacted with the contact member 3.

Next, the characteristics of the detection operation of this embodiment will be described. In the state shown in FIG. 3, it is detected that the second and third electrically conducting members 92 and 93 are off and the fourth electrically conducting member 94 is on to form the code “010” and that the cord is in the zone 5. are doing. From this state, the cam ring 20 is in zone 1
When moving in the direction, first, the brush 954 comes into contact with the switching edge portion 923b of the conductive land portion 923, the second electrically conductive member 92 is turned on, and the code changes to "110". The focus detection circuit 51 detects that the cam ring 20 is at the boundary position between the zones 4 and 5 based on this change.

When the cam ring 20 rotates in the zone 1 direction from this boundary position, the electrical contact piece 952 causes the conductive land portion 941.
Of the electric contact 95
Since No. 4 is in contact with the conductive land portion 923, the code remains unchanged at "110", and it is detected that it is within the zone 4.

The cam ring 20 is located in the zone 1 in the zone 4.
When the electric contact piece 954 is rotated in the direction,
3, but the electrical contact piece 952 is not connected to the conductive land portion 921.
Since it is in contact with, the code remains unchanged at "110" and it is detected that it is in zone 4.

Further, the cam ring 20 moves within the zone 4 into the zone 1
When the electric contact piece 954 is rotated in the direction,
The first electrical contact member 94 comes into contact with the switching edge portion 941b of No. 1 and the code is changed from "110" to "11".
1 ". The focus detection circuit 51 detects that the cam ring 20 is at the boundary between the zones 3 and 4 due to this change.

Similarly, when the cam ring 20 rotates in the same direction,
Each zone and zone switching are detected by the same operation as described above. Even when the cam ring 20 rotates in the opposite direction,
The boundaries between the zones 4 and 5 are detected by the switching edges 923b of the electrical contact pieces 954 and the conductive land portions 923.

As described above, in the second embodiment, 3-bit data is detected by the electric conducting members 952, 953, 954 and the two electric contact pieces 953, 954 substantially arranged in two rows. However, since the number of electrical conducting members required to be accurate is two, and the number of electrical contacts to be positioned and adjusted is two, manufacturing and assembling are facilitated.

In the illustrated embodiment, the three-digit binary numbers in the zones 1 to 8 described above are not arranged in the order of magnitude, but this is merely shown as an example of display. Actually, the signal pattern can be arbitrarily determined by the pattern formation of the electrically conductive member, the number of digits is not limited to three digits, and it is not necessary to convert it into a binary number. Of course, it must be arranged in order of size. Nor is it of the nature that subsequent processing is impossible.

Further, this embodiment is an example used for detecting the focal length of the zoom lens of the camera, and the use of the present invention is not limited to this.

[0046]

As described above, according to the present invention, a plurality of electrically conducting members having a combination of a conducting portion and a non-conducting portion extending in the relative movement direction are arranged in parallel, and a substrate is provided according to the relative movement position. And a plurality of electrical contact pieces that contact and separate the conductive portion and the non-conductive portion on the substrate to form a conductive and non-conductive state for each of the electrically conductive members of each row, and at least one of the electrical contacts. Since the conducting portion of the electrically conducting member is provided in the non-conducting portion of the other electrically conducting member, the number of rows of the electrically conducting member to be accurately formed is reduced, and the electrical contact member to be accurately positioned is The number decreases.

According to a second aspect of the present invention, there is provided a group of electrically conducting members which are arranged in parallel and each of which is composed of a combination of a conducting portion and a non-conducting portion extending in a particular direction. Relative to each other, and depending on the position of movement, contacts the above-mentioned conducting parts and non-conducting parts to conduct electricity to each electrically conducting member.
An electrical conduction mechanism having an electrical contact group that forms a non-conductive state, wherein the electrical conduction member group and the corresponding electrical contact group are separated into two or more groups in a relative movement direction,
Since the conducting portion of the one electrically conducting member group is transferred to the non-conducting portion of the other electrically conducting member group, the number of electrical contact piece groups to be adjusted in position is reduced, and the electrical contact piece group and the electrically conducting member are adjusted. Adjusting the position with the group became easy and easy.

[Brief description of drawings]

FIG. 1 is a diagram showing a configuration of a first embodiment of an electrical conduction mechanism of the present invention.

FIG. 2 is a diagram showing a conventional electrical conduction mechanism for explaining the operation of the present invention.

FIG. 3 is a diagram showing a configuration of a second embodiment of the electrical conduction mechanism of the present invention.

FIG. 4 is a diagram showing a conventional electrical conduction mechanism for explaining the operation of the present invention.

FIG. 5 is a cross-sectional view showing an upper half of a main part of a zoom lens barrel of a single-lens reflex camera having an electrical conduction mechanism, which is vertically cut along the optical axis.

FIG. 6 is a diagram showing a configuration of a main part of a conventional electrical conduction mechanism.

[Explanation of symbols]

 80 Code Plate 81 First Electrically Conducting Member 82 Second Electrically Conducting Member 821 Conducting Land Part 823 Conducting Land Part 823a Switching Edge 823b Switching Edge 82 Third Electrically Conducting Member 83 Fourth Electrical Conduction Member 85 Electrical contact piece group 851 Electrical contact piece 852 Electrical contact piece 87 Electrical contact piece group 871 Electrical contact piece 872 Electrical contact piece 90 Code plate 91 First electrical conducting member 92 Second electrical conducting member 921 Conductive land portion 923 Conductive Land portion 923b Switching edge portion 93 Third electrical conduction member 94 Fourth electrical conduction member 951 Electrical contact piece 952 Electrical contact piece 953 Electrical contact piece 954 Electrical contact piece

Claims (5)

[Claims] 1. An electric conduction mechanism having an electric conduction member attached to one member of two members that move relative to each other and an electric contact piece attached to the other member and slidingly contacting the electric conduction member. A plurality of electrically conducting members having a combination of conducting portions and non-conducting portions extending in the relative movement direction are arranged in parallel, and a conducting portion and a non-conducting portion on the substrate depending on the relative movement position. A plurality of electrical contact pieces that contact each other to form a conductive / non-conductive state for each of the electrical conduction members in each row, and at least the conduction portion of the one electrical conduction member is connected to the other electrical connection member. An electric conduction mechanism, wherein the electric conduction mechanism is provided in a non-conduction portion of the conduction member. 2. A plurality of electrically conducting members arranged in parallel, each of which is composed of a combination of a conducting portion and a non-conducting portion extending in a specific direction, and relatively moves in a specific direction between the electrical conducting member group, and An electrical conduction mechanism having a plurality of electrical contact pieces that come into contact with the conductive portions / non-conductive portions according to the moving position to form a conductive / non-conductive state for each electrical conductive member, An electrically conducting member and a corresponding electrical contact,
It is divided into two or more groups separated from each other in the relative movement direction, and the conducting portion of the electrically conducting member of the one group is transferred to the non-conducting portion of the electrically conducting member of the other group. Conduction mechanism. 3. The electrical conduction mechanism according to claim 1 or 2, further detecting the relative position as a zone of the length of the conducting portion / non-conducting portion, and further detecting the relative position of the conducting portion and the non-conducting portion. An electrical continuity mechanism, comprising position detecting means for detecting the boundary position of each zone at the switching edge portion. 4. The electrically conductive member according to claim 3, wherein all of the electrically conductive portions including the switching edge portion of the one electrically conductive member are transferred to the electrically non-conductive portions of the other electrically conductive members. Electrical continuity mechanism. 5. The electrically conductive member according to claim 3, which is equivalent to a part of the electrically conductive portion including the switching edge portion of the one electrically conductive member, and the electrically conductive portion shorter than the one zone length is electrically connected to the other electrically conductive member. Transferred to a non-conductive portion of the conductive member, the conductive portion of the one electrically conductive member includes the switching edge portion,
An electric conduction mechanism, wherein a part shorter than the transferred conduction portion is cut off.