JPS63165831A - Connector for connecting electric circuit - Google Patents

Abstract

PURPOSE:To improve the reliability of connection between contacts by connecting a contact having a cleaning function, its adjacent contacts and opposite two contacts respectively in parallel in a connector for connecting respective electric circuits between an optical apparatus body and an auxiliary apparatus. CONSTITUTION:A connection pin 3a8 having a cleaning function is allowed to slide on all lens side contact pins 10a1-10a7. Even if a foreign substance such as dust is stuck to the contact faces of lens side contact pins 10a1-10a7, the foreign substance can be removed at the time of mounting rotation. Especially, the lens side contact pin 10a7 can be also cleaned out by sliding. Thereby, electric connection between the lens side contact pins 10a1-10a7 and camera side contact pins 3a1-3a7 can be surely attained. Since the camera side contact pins 3a7 and 3a8 and lens side contact pins 10a7 and 10a8 are electrically connected respectively in parallel, accidents due to contact defects can be reduced as probability.

Description

[Detailed Description of the Invention] <Industrial Application Field> The present invention is applicable to optical equipment such as interchangeable lens cameras.
The present invention relates to an electrical circuit connection connector that connects the electrical circuits of an optical device main body and an accessory device such as an interchangeable lens.

<Prior Art> In an interchangeable lens camera using a rotatable bayonet mount that rotates clockwise or counterclockwise to couple or detach the respective mounts of an interchangeable lens and a camera body. There is an electric circuit on each side of the burner, interchangeable lens, and camera body.
Various types of information, such as information for automatic exposure control and information for automatic focus adjustment, are now being exchanged with each other, and devices that have a large number of connector bins near the mount for the purpose of exchanging signals have become publicly known. It has become.

That is, as shown in FIGS. 8 to 11, camera A (
A lock pin 2 for fixing the camera side bayonet mount when the lens side mount is installed and a contact seat 3 forming the camera side connector are fixedly installed on the front surface of the camera body 4 shown in Fig. 4).
The contact seat 3 has a plurality of (seven in the illustrated example) contact pins 3.
The contact pins 3a consisting of a
The contact pin 3a is biased to protrude at the same height from the front surface of the
1 to 3a7 are connected to an electric device 6 on the camera body side by a flexible printed board 5. On the other hand, the interchangeable lens B holds a photographing lens group 7, and has a lens-side bayonet mount 8 on its rear end surface, an elongated lock groove 9 that engages with the lock pin 2 on the camera side, and a contact seat that constitutes a lens-side connector. 10 is fixed to the contact seat 10, and a contact pin 10a consisting of a plurality of (seven in the illustrated example) contact pins 10a, to 10a7 is fixed to the contact seat 10 so that its rear end is on the same plane. The pins 10a1-10a7 are connected to a lens-side electric device 12 via a flexible printed board 11.

There are three claws 1 on the inner circumference of the camera side bayonet mount l.
a1 to 1a3, whereas the lens side bayonet mount 8 has 3 that engages with the molds 1al to 1a3, respectively.
The claws 8al to 8a3 are formed separately.

When the mounting is completed, the lock pin 2 on the camera side engages with the lock groove 9 to maintain the mounted state.

When the interchangeable lens B is attached to the camera A using each bayonet mount, the mount surfaces of both lenses overlap each other as shown in FIG. 4, and the camera body side contact pin 3a contacts the lens side contact pin 10a. The contact pins 3a1 to 3a7 and the contact pins 10a1 to 10a7 are brought into contact with each other with appropriate contact pressure by the spring 3b, and the camera body side electric device 6 and the lens side electric device 12 exchange electric signals with each other. will begin to do this.

Regarding the connection operation of both contact pins when the interchangeable lens B is attached, as shown in FIG. Contact pins 3a7 to 3a1
are sequentially pressed by the end slope 10b of the lens-side contact seat IO, compressing the contact springs 3b7-3b, and alternately pressing and sliding the surface of the lens-side contact seat 10 and the lens-side contact pins 10a1-10a7. When the installation is completed, the contact pins 3a1 and 10al, 3a2 and 10a2 are connected as shown in FIG.
, -3a7 and 10a7 are in contact with each other on the same plane.

Problems to be Solved by the Present Invention> However, in the conventional connection connector as shown in FIGS. 8 and 9, each time the interchangeable lens B is rotated and attached to the camera A, the lens side contact pin 10a1 first comes into sliding contact with the camera side contact pin 3a7, and then the camera side contact pins 3a6~
3al and the rotational mounting is completed. Hereinafter, during rotational mounting, the lens side contact pin 10a2 comes into sliding contact with the camera side contact pins 3a7 to 3a2, and the lens side contact pin 10a3
is in sliding contact with the camera side contact pins 3a7 to 3a3, and...the lens side contact pin 10a6 is in sliding contact with the camera side contact pin 3a7.
3a6, and the lens side contact pin 10a7 makes sliding contact only with the camera side contact pin 3a7.

The lens-side contact pins 10a1 to 1Oa7 are fixed, and because they are arranged at the same height as the connection surface of the lens-side contact seat 10 or in a recessed state, foreign matter such as dust and dirt adheres to them. There is a high degree of In the above-mentioned conventional connection connector, foreign matter attached to the lens side contact pins 10a1 to 10a7 is removed from the camera side when the contact pins 3a7 to 3al are on the pins during the mounting rotation.
Cleaning is performed by sliding the surface (on the surface). Here, the lens side contact pins 10a, ~10a6, and the camera side contact pins 3a7~3al slide from one end to the other (left and right ends in FIGS. 8 and 9) at least once. Although it is cleaned depending on the situation, the lens side contact pin 10a
Only 7 is the camera side contact pin 3 when the rotation is completed.
Since a7 slides only from one end (the right end in FIGS. 8 and 9) to approximately the center, leaning cannot be performed reliably, and foreign matter may not be removed. Moreover, each time the interchangeable lens B is rotated and attached to the camera A, foreign matter attached to the lens side contact pins 10a1 to 10a6 is removed by the camera side contact pins 3a7 to 3a2 in the direction of the lens side contact pin 10a7. The foreign matter is transported and accumulated on the lens side contact pin 10a7, and the degree of foreign matter adhering to the lens side contact pin 10a7 increases, and the presence of this foreign matter causes poor contact, etc., and the normal operation of the camera and lens is impaired. There was a problem that proper operation could not be guaranteed.

<Object of the Invention> The present invention has been made in order to solve the above-mentioned conventional problems, and is a method for connecting contact pins between an optical device main body and an accessory device, which achieves contact continuity between the contact pins of both by rotational mounting. An object of the present invention is to provide a connector for connecting an electric circuit that can improve contact reliability and prevent malfunctions.

<Means for Achieving the Problems> The structure of the present invention for achieving the above-mentioned object will be explained using FIGS. 1 and 2, which correspond to embodiments.

The embodiment of the present invention has electrical devices on the camera body side and the interchangeable lens side, and a plurality of contact pins 3a1 to 3an (camera side) and 10a, ~10
In a camera having an interchangeable lens in which an (lens side) is arranged at approximately the same diameter position with respect to the optical axis, the camera side contact pin 10a to 10an contacts the camera side contact pin 3an first. Contact pin 10a,
In order to clean the dirt, dust, etc. that has adhered to the contact surface of ~1oan, a contact pin 3a n+1 with a cleaning function is placed at approximately the same diameter position as the contact pin, and the device is also completed on the lens side. The contact pin 3 a n
Contact pins 10an which contact +1 are arranged, and these contact pins 3afi+l 110an++ are electrically connected in parallel to adjacent contact pins 3an and 10an, respectively.

<Embodiment> A first embodiment of the present invention will be described below with reference to FIGS. 1 to 4.

A contact seat 3 constituting a camera body side connector is provided around the rotatable camera-side bayonet mount 1 of the camera body 4 on the front side of the camera A shown in FIG. Camera side contact pin 3al at equal intervals along
, 3a2. ..., 3a8 are arranged, and the contact spring 3
b, ~3b2. ..., the contact seat 3 is biased by 3b8
The contact pins 3al to 3ag protrude from the front surface (upper surface in FIGS. 1 and 2) of the camera body side electrical device 6 and the power supply pattern of the flexible printed board 5 (see FIGS. (not shown)
It is connected to a power supply battery (not shown) whose terminal is connected to.

On the other hand, lens-side contact seats 10 constituting the interchangeable lens-side connector are provided around the rotatable lens-side bayonet mount 8 of the interchangeable lens B, and the contact seats 10 are arranged at equal intervals along the circumferential direction. Lens side contact pin 10a 1,
10a 2 , =-, 10a B is fixedly installed.

Furthermore, the camera side contact pins 3a7 and 3a6 and the lens side contact pins 10a7 and 10a8 are electrically connected in parallel, which will be explained later with reference to the electrical circuit diagram shown in FIG. Contact pin 1 of lens side contact seat 10
0a 1. Each of the outer end surfaces of 10a 6 has a slope 10
b, 1Ob2 are formed, and when the interchangeable lens B is attached to the camera A by rotation, the contact pins 3a, 3a8 on the camera A side are formed.
The lens contact pins 10a, -10a8 are pushed in against the biasing force of the contact springs 3b, -3b8.
is connected to the lens-side electric device 1112 via the flexible printed board 11.

The camera side contact pins 3a of the contact seat 3 to the camera, ~
A contact pin 3ag having a cleaning function is located in the optical axis direction at the same diameter position as 3a7 and on the circumferential direction in the direction in which it first connects with the lens-side electric contact pin 10a when the interchangeable lens B is mounted and rotated. It is movable to the
. This contact pin 3ag is connected to another camera side contact pin 3a by a spring member 3b8.

~3a7 is biased by a spring in the same direction and approximately at the same protrusion height.

With the above arrangement and configuration, the contact pin 3ag slides with all the lens side contact pins loa, ~10a7 when the interchangeable lens B is rotated to be attached to the camera A, and when the attachment is completed, the contact pin 3ag is shown in FIG. , it reaches the position where it abuts against the lens side contact pin 10a8. Therefore, even if foreign matter such as dust adheres to the contact surfaces of the lens-side contact pins 10a, 10a, 7, the foreign matter can be cleaned by sliding (like a wiper) during the mounting rotation described above. In particular, the lens side contact pin 10a7, which is substantially on one end side, can be cleaned by sliding, which was impossible in the past.
Electrical contact between the contact pins 1 to 10a7 and the camera side contact pins 3al to 3a7 at the stage of completion of attachment can be ensured.

As described above, the camera side contact pin 3ag removes foreign matter such as dirt and dust from the contact part of the lens side contact pin TOAL-10A7, and the lens side bayonet mount 8 is completely attached to the camera side bayonet mount 1. In the state shown in Fig. 2, the lens side contact pins 10a, ~1
With the contact pins 0a7 and the camera side contact pins 3al to 3a7 facing each other and in contact with each other, dust and dirt between the contacts are removed, and contact failures are greatly reduced due to increased contact resistance.

Furthermore, as mentioned above, the camera side contact pins 3a7 and 3a
8 and the lens-side contact pins 10a7 and 10a8 are electrically connected in parallel, and since conduction is achieved between each two contact portions, contact failure accidents are reduced probabilistically.

FIG. 3 shows a camera body side electric device 6 used in the present invention.
FIG. 2 is an electric circuit diagram showing the connection between the lens-side electric device 12 and the lens-side electric device 12. FIG.

In the figure, 21 is an electric circuit mounted on the camera body, 22 is a power source such as a battery that is also housed in the camera body, and 23 is a power source that is supplied with power from the power source 22, and also connects the electronic circuit 21 and the lens side described later. 4 is a constant voltage output circuit that serves as a power source for the electronic circuit, 24 is an analog switch that turns on and off the power supply to the motor (described later) mounted on the lens side, 1 is a camera side bayonet mount provided on the camera body, and 26 is a A lens mounting detection switch 27 is provided on the input signal line of the electronic circuit 21 and is located near the camera-side bayonet mount 1. Reference numeral 27 is a lens mounting/detaching response member that operates the lens mounting detection switch 26. The lens attachment/detachment response member 27 is a swinging member pivotally attached to the back side of the camera side bayonet mount l,
It has two arms on both sides of the pivot point, one arm is engaged with a part of the lens side bayonet mount 8 and driven, and the other arm is used as one switch of the lens attachment detection switch 26. It is designed to press the pieces.

The lens attachment detection switch 26 has two switch pieces that are separated from each other when the lens is not attached.
When the lens is attached, the two switch pieces are in contact with each other to connect the input terminal of the electronic circuit 21 and the output terminal of the constant voltage output circuit 23.

As mentioned above, the contact seat 3 for wiring connection is provided in the lower inner peripheral area of the camera side bayonet mount l, and the contact seat 3 has a contact bin 10a 1-- provided on the lens side.
A large number of contact pins 3a H~ contacting each of 10a 7
3a7 is provided. Here, each contact bin 3a, ~
3a7 is connected separately to the wiring ~L7 on the printed wiring board attached to the camera body, but the contact bin 3as, which has a cleaning function, is connected in parallel to one wiring ~L7. It can be seen that it is connected to. Similarly, the contact bin 10ag is connected in parallel to the wiring L14.

The wiring L1 connected to the contact bin 3al is a motor power line for supplying power from the power supply 22 inside the camera body to the motor inside the lens (described later), and is equipped with the analog switch 24 as described above. It is being

The wiring 3 connected to the contact bin 3a3 is connected to the lens attachment detection switch 26 and the input terminal of the electronic circuit 21. Further, the wiring line 2 connected to the contact bin 3a2 serves as a power installation line (power ground line), and the wiring line 2 is connected to the negative electrode of the power source 22.

The wiring line 7 connected to the contact bin 3a is connected to the ground wire of the lens-side electronic circuit, which will be described later.
The wiring L7 is connected to the negative electrode of the power source 22 together with the ground terminal of the electronic circuit 21 on the camera body side.

Wiring L4-L connected to contact pins 3a4-3a6
6 is a signal line for transmitting and receiving signals between the electronic circuit 21 on the camera body side and the electronic circuit on the lens side, and each wiring line 4 to L6 is connected to the signal terminal of the electronic circuit 21. .

The interchangeable lens of the present invention, which is configured to be detachably attached to the camera body configured as described above, includes a focusing drive motor 29, a stationary switch device that switches the direction of power supply to the motor 29, and The lens side is equipped with an electronic circuit 30 that controls the motor 29 and exchanges various signals with the electronic circuit 21 on the camera body side, and is detachably fitted to the camera side bayonet mount l. A bayonet mount 8 and a contact seat 10 that is disposed in a lower inner peripheral area of the lens-side bayonet mount 8 and faces the contact seat 3 on the camera body side are provided.

As shown in the figure, the contact seat 10 provided on the interchangeable lens side is provided with seven contact pins 10a1 to 10a7 that contact the contact pins 3a1 to 3a7 on the camera body side, and these contact pins 10aH to 10a7 are individually wired and connected to 8 to L+4.

Wiring lines 8 and L9 are connected to the motor 29 via a static switch device which will be explained later, and other wiring lines L IG
"" Compared to L14, it is a power line for flowing a larger current.As will be explained later, L8 is a motor power line, and L is a power ground line for grounding one pole of the motor 29. There is.

The wiring L 10 connected to the contact pin 10a3 serves as an electronic circuit power line for supplying current to the lens side electronic circuit 30, and is connected to the power terminal of the electronic circuit 30 and also connects to the contact pins 10a3 and 3a3. It is connected to the wiring 3 on the camera body side via.

The wiring L14 is connected to the grounding terminal of the electronic circuit 30, and is also connected to the wiring L7 on the camera body side via contact pins 10a7 and 3a7, and is connected to the grounding terminal on the interchangeable lens side of the electronic circuit 30 ( signal ground line).

The wiring L11""L+3 is connected to the signal terminal of the electronic circuit 30, and the contact pins 10a4 to 10a6
The contact pins 10a4 to 10a6 on the lens side and the contact pin 3a on the camera body side are connected to each other separately.
Wire on the camera body side via 4-3a6 and 4-L6
They are each connected separately. That is,
The wiring lines L II to L +3 are signal lines on the lens side.

The static switch device for switching the direction of power supply to the motor 29 includes two sets of four transistors T1 to T, each pairing one NPN transistor and one PNP transistor.
4, one pair is connected to one pole of the motor 29 and the other pair is connected to the other pole of the motor. Also, multiple pairs of PNP) transistors T1 and T
The emitter 2 is connected to the wiring B provided on the interchangeable lens side, and the wiring 8 is connected to the contact pin l in the contact seat IG.
The wiring is connected to the camera body via Oa1. (i.e. wired 8 is wired 1
Together, they constitute a power supply line for supplying power from the power source 22 to the motor 29. ) One pole of the motor 29 is connected to the collector of each of the paired PNP transistors T1 and NPN l-transistors T4, while the other pole of the motor 29 is connected to the collectors of each of the paired PNP transistors T2 and NPN) transistors. T3
are connected to each collector. On the other hand, many-paired NP
The emitter of each of the N I-transistors T3 and T4 is connected to wire 9. Wire it.

is a power ground line provided on the interchangeable lens side, which connects the negative electrode side of the motor 29 to the contact pin 3a2 on the camera body side via the contact pin 10a2, and also connects it via the wiring line 2 on the camera body side. It is connected to the negative pole of the power supply 22.

The electronic circuit 30 includes each transistor T of the static switch device.
A control terminal for controlling 1 to T4 is provided,
Each control terminal and the base of each transistor T1 to T4 are connected by signal lines M and -M4. Note that R, -
wR4 is a resistance.

As mentioned above, the features of the interchangeable lens of the present invention are as follows.
Although the grounding wire and grounding connection terminal of the motor 29 and the grounding wire and grounding connection terminal for the electronic circuit are respectively provided for exclusive use, the operation of the illustrated components will be briefly explained below.

(i) When no lens is attached to the camera body.

When the lens is not attached, press the contact seat lO on the lens side.
are apart from the contact seat 3 on the camera body side, so the contact pins 3a1 to 3a7 and 10a to 10a7 are not in contact with each other. Further, as shown in the figure, the lens attachment detection switch 26 provided on the camera side bayonet mount l is in a state where its two switch pieces are separated from each other. Therefore, the input terminal of the electronic circuit 21 is connected to the pressure reducing resistor RPD.
The input terminal is connected to the negative electrode of the power supply 22 through the input terminal, and a low level voltage close to the ground voltage is applied to the input terminal. Therefore, a high level voltage that turns off (open state) the analog switch 24 is generated from the output terminal of the electronic circuit 21, so the analog switch 24 is turned off, and the power supply 22 and the contact pin 3al are cut off. has been done.

(ii) When a lens is attached to the camera body.

When attaching a lens to the camera body, the lens-side bayonet mount 8 is rotated clockwise in the figure relative to the camera-side bayonet mount l, so that the lens-side bayonet mount 8 allows the lens attachment/detachment responsive member 27 to pivot at its pivot point. As a result, one switch piece of the lens attachment detection switch 26 is pushed by one arm of the lens attachment/detachment response member 27, so that both of the detection switch 26 The switch pieces touch each other and the switch 26 is turned on. Therefore, since the 5V output terminal of the constant voltage output circuit 23 is connected to the input terminal of the electronic circuit 21 via the switch 26, a high level (5 volts) input voltage is applied to the input terminal. Therefore, the voltage level of the output terminal of the electronic circuit 21 is changed from "H" to "L", the analog switch 24 is turned on, and the positive electrode of the power supply 22 and the contact pin 3al are connected.

On the other hand, when the lens is completely attached to the camera-side bayonet mount 1, the contact pins 3a1 to 3a7 on the camera side come into contact with the contact pins lOa and 10a7 on the lens side as shown in the figure. IQ L, ~L
7 is the wiring on the lens side 8~L 14 is the contact pin: 3a1
~3a7.10a1~10a7, and as a result, wiring connections as shown are completed. (However, in the attached drawing, the lens attachment detection switch 26 is shown in an open state, but when the lens attachment is completed, the switch 26 remains closed.) After the lens attachment is completed, the camera body Control signals related to camera operations (mainly focusing operations) are sent from the electronic circuit 21 on the lens side to the electronic circuit 30 on the lens side via wiring L4 to L6 and LII''=L13, and at the same time, from the electronic circuit 30 on the lens side. A signal related to the motor 29 is sent to the electronic circuit 21 on the camera side via the same wiring.For example, a control signal from the electronic circuit 21 causes the electronic circuit 30 to change the signal level of the wiring M3 to L''.
If the signal level of the transistor T is set to “H”, the transistor T
1 and T3 are electrically connected and wired to the motor 29 8, and a current flows in the direction indicated by the arrow through the transistor T1, causing the motor 29 to rotate in the forward direction, and the current is wired through the transistor T3. 8, contact pins 1oa2 and 3a2,
The current flows back to the negative electrode side of the power supply 22 through the wiring L2.

Further, when a signal to reverse the motor 29 is sent from the electronic circuit 21 to the electronic circuit 30 through the wirings 4 to L6, an "L" level signal is sent from the electronic circuit 30 to the wiring M2, and at the same time, the wiring M4 An “H” level signal is output to (at this time, the signal level of the wiring M is “H” and the signal level of the wiring M3 is “L”), and as a result, the transistors T2 and T4 become conductive. Then, a current flows into the motor 29 from the transistor T2 in the direction opposite to that indicated by the arrow in the figure, causing the motor 29 to rotate in the reverse direction.

Next, a second embodiment of the present invention will be described based on FIGS. 5 to 7. This second embodiment is a further improvement of the first embodiment, and is particularly aimed at suppressing wear on the sliding contact pins, and the same components as the first embodiment are the same. A reference numeral is attached and the explanation thereof is omitted. In FIGS. 5 and 6, the contact seat 3 on the camera A side is on the first surface 3c.
and a second surface 3c', and on the other hand, the contact seat lO on the side of the interchangeable lens B also has a first surface 10c and a second surface 3c'.
A step surface consisting of 10c' is formed. In addition, the second surface 3 when viewed from the first surface 3c of the contact seat 3
The recess 1 of c' and the protrusion of the second surface 100' viewed from the first surface 10c of the contact seat IO are made to substantially coincide.

On the first surface 3c of the contact seat 3 on the camera A side, there are 2
Two camera side contact pins 3a, 3a2 are arranged, while the second camera side contact pin 3c' is provided with the remaining camera side contact pin 3a3.
-3a7 are arranged. Further, the contact pin 3a is provided on the first surface 10c of the contact seat lO on the side of the interchangeable lens B.
1.2 lens side contact pins 10al corresponding to 3a2
, 10a2 are disposed, and on the other hand, the remaining lens side contact pins 10a3 to 10a7 corresponding to the above-mentioned contact pins 3a3 to 3a7 are disposed on the second surface 10c'. here,
The camera side contact pins 3a1 to 3a7 are contact springs 3b as in the first embodiment described above.

~3b7, it is urged in the optical axis direction and is normally held in the protruding position, but can be retracted if pressed. In addition, the lens side contact pins 10a1 to 10a7 have contact seats IO.
However, these contact pins 3a are fixedly arranged on
, to 3a7 are always protruding, as shown in FIG.
The tip of ~3a7 is the first surface 10 of the contact seat IO on the lens side.
Lens side contact pins 10a, , 1 disposed at c
It is set so that there is no contact with 0a2.

On the other hand, a contact pin 3a9 having a cleaning function is disposed on the first surface 3C of the contact seat 3 on the camera side, and a contact pin 3al also having a cleaning function is disposed on the second surface 3c'. is installed. This contact pin 3ag is at the same diameter position as the camera side contact pins 3al and 3a2, and when the interchangeable lens B is rotatably mounted, the lens side contact pin 10a
1 and is provided at a position in the circumferential direction where it first slides, and is biased to project in the optical axis direction by a spring member 3b9 so as to be retractable. Also, contact pins 3a and 0 are camera side contact pins 3a.
3 to 3a7, and is provided at a position in the circumferential direction that first slides on the lens side contact pins 1oa3 to 1oa7 when the interchangeable lens B is rotatably mounted.
b and o are biased to project in the optical axis direction so as to be retractable. Note that the normal protruding height of the contact pin 3ag is set to approximately the same height as the camera side contact pins 3al and 3a2,
The normal protrusion height of the contact pins 3a, 0 is set to be approximately the same height as the camera side contact pins 3a3 to 3a7.

Furthermore, on the first surface 10c of the contact seat 10 on the side of the interchangeable lens, there is a contact pin 10ag that comes into contact with the contact pin 3a9 in the completed mounting state shown in FIG.
has a contact pin 10a that comes into contact with the contact pin 3alG.
, (, are arranged respectively. Also, as shown in FIG. 7, the contact pin 3ag on the camera side is connected to the contact pin 3a7 in the wiring 2 connected to the contact pin 3a2. The wiring connected to 7 is connected in parallel.

On the other hand, the contact pin lOa g on the interchangeable lens side is the contact pin l
Wire connected to Oa 2 and contact pin 10alo
is connected in parallel to wiring L+4 connected to contact pin 10a7.

° To explain the operation of the second embodiment configured as described above, when the interchangeable lens B is attached to the camera A and rotated, the contact pin 3ag is inserted into the first position of the contact seat lO on the lens side.
Two lens side contact pins 10a existing on the surface 10c,
, IOa 2, and even if foreign matter such as dust adheres to the contact surface, cleaning (same as in the first embodiment described above) reliably prevents poor contact. Also, when the contact pin 3a1o is mounted and rotated, the contact seat 10
By sliding on and cleaning the remaining five lens-side contact pins IOa 3 to 10a7 present on the second surface 10c', contact failures can be similarly reliably prevented.

In the second embodiment, since the opposing sides of both contact seats 3 and 10 are stepped, both contact pins 3 and 10 are stepped when the interchangeable lens B is rotated to attach to and detach from the camera A.
Wear of the contacts can be reduced by reducing the number of times each of a, ~3a7.10a, and ~10a7 slides. For example, in the first embodiment described above, the lens side contact pin loa
, is the seven camera side contact pins 3 during the mounting rotation described above.
a, ~3a7 and contact pin 3 with cleaning function
a8, but in the second embodiment there are a total of three (contact pins 3a, 3a).

3a2 and contact pins 3a,), and the number of sliding movements of other contact pins can be reduced to suppress wear.

In the above embodiment, the camera-side contact pin is movable, but the same effect can be obtained even if the lens-side contact pin is movable.

<Effects of the Invention> As explained above, the present invention is advantageous in that when an accessory device is rotatably attached to an optical device main body and an electrical connection is made between the two by contacting the contact pins, dust, etc. attached to the contact pins can be removed. A contact pin that has a cleaning function to remove foreign matter is provided near the contact pin that first contacts the other contact pin group when rotating and attached, and both contact pins are electrically connected in parallel, and these contact pins are Since the contact pins on the corresponding side also electrically contact the two contact pins in parallel, it is possible to improve the reliability of contact between the contact pins and prevent malfunctions.

Furthermore, by forming the opposing sides of both contact seats that hold both contact pins into a stepped shape, it is possible to reduce the number of times each contact pin slides, thereby reducing wear on the contact pins.

[Brief explanation of the drawing]

1 to 4 show a first embodiment of the present invention,
Figure 1 is a cross-sectional view showing the state of the connector while an accessory device is being attached to the main body of the optical device, Figure 2 is a cross-sectional view showing the connector shown in Figure 1 has been attached, and Figure 3 is a cross-sectional view showing the state of the connector shown in Figure 1 being attached. FIG. 4 is a longitudinal sectional view of the central part of the camera with the lens attached, and FIGS. 5 to 7 show a second embodiment of the present invention. FIG. 5 is a cross-sectional view showing the state of the connector while the accessory device is being attached to the optical device body.
FIG. 6 is a cross-sectional view showing a state in which the connector shown in FIG.
Fig. 1 shows a second embodiment of the present invention, Fig. 8 is a sectional view showing the state of the connector in the middle of attaching an accessory to the optical device main body, and Fig. 9 shows the connector shown in Fig. 8 has been attached. 10 and 11 show the conventional example. Figure 10 is a front view of the camera side bayonet mount viewed from the front side, and Figure 11 is a front view of the lens side bayonet mount viewed from the mounting side. It is a front view. A・・・・・・・・・・・・・・・・・・・・・
−・・・・・・・・・・・・・・・・・・・・・ Camera (optical equipment) B・・・・・・・・・・・・・・・・・・
・・・・・・・・・・・・・・・・・・・・・Interchangeable lens (attached equipment) L・・・・・・・・・・・・・・・・・・
・・・・・・・・・・・・・・・Camera side bayonet mount 3・・・・・・・・・・・・・・・・・・・・・
・・・・・・・・・・・・・・・・・・・・・・・・・・・
・・・・・・・・・・・・・・・・・・Contact seats 3a, ~3a,.・・・・・・・・・・・・・・・
・・・・・・・・・・・・Camera side contact pin 8...
・・・・・・・・・・・・・・・・・・・・・・・・
...Lens side bayonet mount IO...
・・・・・・・・・・・・・・・・・・・・・・・・
・・・・・・・・・・・・・・・・・・・・・・・・
・・・・・・・・・・・・Contact seats 10a, ~10a
lO・・・・・・・・・・・・・・・・・・・・・
...Lens side contact Pingo Hisa? Figure 70 Δ Figure 1/

Claims (1)

[Claims] The mount on the optical equipment main body side and the mount on the accessory equipment side to the optical equipment main body are composed of a rotatable bayonet mount that connects by rotating in one direction and separates by rotating in the other direction, and is centered around the optical axis of the mount side. In an electric field circuit connecting connector having a plurality of contact pin groups arranged at substantially the same circumferential position and forming pairs facing each other when the mount is attached, one of the contact pin groups is connected to the mount. The other contact pin group is fixed, and the other is movable in the optical axis direction, and furthermore, there is a contact pin group on the same circumference of the displaceable contact pin group, which first contacts the other contact pin group when rotating and attaches, and also when the contact pin group is rotated. A contact pin is arranged so as to be able to be elastically displaced in the optical axis direction so as to be in sliding contact with all of the contact pin groups, and the contact pin is electrically connected in parallel with at least one of the adjacent contact pins, and the contact pin is electrically connected in parallel with at least one of the adjacent contact pins. A connector for connecting an electric circuit, characterized in that the two contact pins are arranged to contact each of at least two contact pins that are electrically connected in parallel among a group of contact pins that are in contact upon completion of mounting.