# Patent

## Title
Connector having a cam operating portion which presses a connection object with being rotated

## Abstract

Provided is a connector including a plug and a receptacle which are adapted to be fitted together. The plug includes a plate-like or sheet-like connection object, a ground shell which is disposed on one surface side of the connection object so as to be spaced apart therefrom, and a guide covering front end portions of the connection object and the ground shell. The receptacle includes contacts and an actuator having a cam operating portion which is made of a material different from that of the ground shell. When the actuator is operated in a state where the plug and the receptacle are fitted together, the cam operating portion is rotated on the ground shell to press the connection object onto the contacts.

## Background
This application is based upon and claims the benefit to priority from Japanese patent application No. 2011-127856, filed on Jun. 8, 2011, the disclosure of which is incorporated herein in its entirety by reference.
TECHNICAL FIELD
This invention relates to a connector utilizing a plate-like or sheet-like connection object.
BACKGROUND ART
Conventionally, there has been known a plate-like or sheet-like connection object called FPC (Flexible Printed Circuit) or FFC (Flexible Flat Cable). Further, various techniques have been proposed for obtaining a predetermined connection by operating an actuator after inserting this kind of connection object (see, e.g. Patent Document 1: JP-A-2006-128018).
Referring to FIG. 1, a technique entitled “Connector” as disclosed in Patent Document 1 will be briefly explained.
A flexible board connector 1 comprises a housing 2, contacts 3, and an actuator 4. Each contact 3 has a fixing portion 3a fixed to the housing 2, a movable portion 3b, and a connecting portion 3c connecting the movable portion 3b to the fixing portion 3a to make the movable portion 3b movable. The movable portion 3b has a recess 3d and a contact point 3e facing each other. The housing 2 has a wall portion 2a disposed between the recesses 3d and the contact points 3e. The actuator 4 has a camshaft 4a disposed in the recesses 3d. Although not clarified in Patent Document 1, the housing 2 and the actuator 4 may be made of the same kind of material such as plastic.
The actuator 4 is set in an open state shown in FIG. 1(a) and then an FPC 5 is inserted between the wall portion 2a and the contacts 3e as shown in FIG. 1(b). In this open state, a force required for insertion of the FPC 5 can be designed to be substantially zero. Thereafter, the actuator 4 is rotated in a clockwise direction so as to be set in a closed state shown in FIG. 1(c). While the actuator 4 is rotated, a cam operating portion (although not given a reference symbol in FIG. 1 quoted from Patent Document 1, a portion which serves as a cam on the side opposite to the side where the actuator 4 is operated by a finger) of the actuator 4 is rotated on the wall portion 2a to raise the movable portions 3b. As a result, the contact points 3e are pressed onto the FPC 5 so that the FPC 5 is electrically connected to the contacts 3.
As described above, the insertion of the FPC 5 is easy and, further, by the simple operation of rotating the actuator 4, the predetermined connection can be obtained.
SUMMARY OF THE INVENTION
However, in the case where the housing 2 and the actuator 4 are both made of plastic in FIG. 1, when the cam operating portion of the actuator 4 slides on the wall portion 2a during the operation of the actuator 4, abrasion powder of the plastic tends to be generated. There is a possibility that the generated abrasion powder causes contact failure between the contacts 3 and the FPC 5.
Further, due to the thickness variation of the FPC 5 within tolerance, the contact load for fitting between the contacts 3 and the FPC 5 tends to change and thus the contact stability is not obtained.
It is therefore an exemplary object of this invention to provide a connector with reduced contact failure and enhanced contact stability.
Other objects of this invention will become clear as the description proceeds.
According to an exemplary aspect of the present invention, there is provided a connector which comprises a plug and a receptacle which are adapted to be fitted together, wherein the plug comprises a plate-like or sheet-like connection object, a ground shell which is disposed on one surface side of the connection object so as to be spaced apart from the connection object, and a guide covering front end portions of the connection object and the ground shell, and wherein the receptacle comprises a contact and an actuator having a cam operating portion which is made of a material different from that of the ground shell and, when the actuator is operated in a state where the plug and the receptacle are fitted together, the cam operating portion is rotated on the ground shell to press the connection object onto the contact.



BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 shows diagrams for explaining a technique disclosed in Patent Document 1 (JP-A-2006-128018), wherein (a) is a cross-sectional view showing a state before an FPC is inserted into a flexible board connector, (b) is a cross-sectional view showing a state where the FPC is inserted in the flexible board connector, and (c) is a cross-sectional view showing a state where the FPC is connected to the flexible board connector;
FIG. 2 is a perspective view showing a non-fitted state of a plug and a receptacle in a connector according to an embodiment of this invention;
FIG. 3 is a cross-sectional view of the state of FIG. 2;
FIG. 4 is a perspective view showing a state where while the plug and the receptacle in the connector of FIG. 2 are in a fitted state, signal lines are in a non-connected state;
FIG. 5 is a cross-sectional view of the state of FIG. 4;
FIG. 6 is a perspective view showing a normal connection state of the plug and the receptacle in the connector of FIG. 2; and
FIG. 7 is a cross-sectional view of the state of FIG. 6.



EXEMPLARY EMBODIMENT
With reference to the drawing, description will be made as regards a connector according to an exemplary embodiment of this invention.
Referring first to FIGS. 2 and 3, a connector 10 is a combination of a plug 11 and a receptacle 21 that are fittable to each other in a predetermined direction, i.e. a first direction A1. In FIGS. 2 and 3, the plug 11 and the receptacle 21 are in a non-fitted state.
The plug 11 comprises a plate-like or sheet-like connection object 13 spreading in the first direction A1 and a second direction A2 perpendicular to the first direction A1, a ground shell 14 in the form of a metal plate which is disposed on one surface side (upper surface side in FIG. 3), in a third direction A3 perpendicular to the first and second directions A1 and A2, of the connection object 13 so as to be spaced apart therefrom, and a plastic insulator 15 fixing them together. Specifically, part of the connection object 13 is fixed by in-molding when the insulator 15 is formed into a predetermined shape and, further, the ground shell 14 is fixedly attached to an outer surface of the insulator 15.
One end, in the first direction A1, of the insulator 15 is called a front end 15a while its opposite end is called a rear end 15b. The dimension, in the third direction A3, of the insulator 15, i.e. the thickness thereof, is set to be relatively small on the front end 15a side while it is set to be relatively large on the rear end 15b side. On the front end 15a side, the insulator 15 has a plate-like portion 16 interposed between the connection object 13 and the ground shell 14. A front end face 13a of the connection object 13 and a front end face 14a of the ground shell 14 are disposed so as to be substantially flush with each other in the third direction A3.
The connection object 13 has, at least at its portion facing the plate-like portion 16 of the insulator 15, a signal layer formed by a number of conductors (not illustrated) which are arranged in parallel in the second direction A2. These conductors are exposed on the opposite surface side (lower surface side in FIG. 3) of the connection object 13 in the vicinity of the front end face 13a. Although an FPC is illustrated as the connection object 13 herein, an FFC may of course be used instead.
The ground shell 14 has, at least at its portion facing the plate-like portion 16 of the insulator 15, a ground layer which extends in the second direction A2 equally to or longer than the dimension of the connection object 13. That is, the ground shell 14 is formed so as to face all the conductors of the connection object 13 in the third direction A3.
The insulator 15 further has a guide 17 which projects forward from the plate-like portion 16 more than the connection object 13 and the ground shell 14 and which covers the front end portions, i.e. the front end faces 13a and 14a, of them. Specifically, the guide 17 has a first portion 17a covering the front end face 13a of the connection object 13 and a second portion 17b covering the front end face 14a of the ground shell 14. A front end of each of the first and second portions 17a and 17b is formed as an inclined surface or a curved surface.
in this manner, the plug 11 is formed with a plate-like fitting portion 11a spreading in the first and second directions A1 and A2.
On the other hand, the receptacle 21 comprises a plastic housing 22 which is elongated in the second direction A2, a number of metal contacts 23 received in the housing 22, an actuator 24 made of a plastic material which is thus different from the material of the ground shell 14, and a receptacle-side metal shell 25 attached to a front upper portion of the housing 22. The actuator 24 has a cam operating portion 24a which serves as a cam on the side opposite to a portion, adapted to be operated by a finger, of the actuator 24.
The housing 22 has, at its front portion, a fitting opening 22a for fitting therein the plug 11. The fitting opening 22a is formed to be elongated in the second direction A2 along the housing 22.
The contacts 23 are arranged in parallel in the second direction A2 at positions corresponding to the fitting opening 22a. Each contact 23 has an upper jaw portion 23a located in the upper part of the fitting opening 22a and a lower jaw portion 23b located in the lower part of the fitting opening 22a. The upper jaw portion 23a and the lower jaw portion 23b are integrally joined together to form a movable portion. The upper jaw portion 23a has a recess 23c facing downward and the lower jaw portion 23b has a contact point 23d with an upward projection. A substantial distance between the upper jaw portion 23a and the lower jaw portion 23b (herein, this is called a “contact opening”) is designed to be greater than the thickness of the fitting portion 11a of the plug 11. That is, each contact 23 is a so-called ZIF (Zero Insertion Force) type contact which is designed so that the insertion force of the fitting portion 11a of the plug 11 becomes zero.
Each contact 23 further has a to-be-held portion 23e held by the housing 22 and a flexible connecting portion 23f connecting the upper jaw portion 23a and the lower jaw portion 23b to the to-be-held portion 23e. In this way, the connecting portion 23f makes the upper jaw portion 23a and the lower jaw portion 23b movable in the housing 22.
The actuator 24 is pivotally or rotatably engaged with the housing 22. The cam operating portion 24a of the actuator 24 is disposed in the recesses 23c of the upper jaw portions 23a. Therefore, when the actuator 24 is rotated, the cam operating portion 24a is rotated in the recesses 23c. The operation caused by the rotation of the cam operating portion 24a will be clarified later.
When fitting the plug 11 into the receptacle 21, the fitting portion 11a of the plug 11 is inserted into the fitting opening 22a formed in the housing 22 of the receptacle 21. Since the contact opening is designed to be greater than the thickness of the fitting portion 11a of the plug 11, the operation of fitting the plug 11 into the receptacle 21 is easy.
Even if the fitting portion 11a is brought into contact with the upper jaw portions 23a or the lower jaw portions 23b of the contacts 23 on the way of fitting into the fitting opening 22a, since the plastic guide 17 is brought into contact with them, no collision between the metals occurs. Even if the fitting portion 11a further moves into the fitting opening 22a to abut the vicinity of the connecting portions 23f of the contacts 23, no collision between the metals occurs likewise. As a consequence, there is no possibility that metal abrasion powder is generated due to collision between the metals to cause an electrical short when the plug 11 is fitted into the receptacle 21.
Since the front end faces 13a and 14a of the connection object 13 and the ground shell 14 are covered with the guide 17, even if the fitting portion 11a of the plug 11 collides with any portion of the receptacle 21 in the fitting operation, the possibility is low that the connection object 13 or the ground shell 14 is damaged.
When the plug 11 and the receptacle 21 are completely fitted together, the state of FIGS. 4 and 5 is obtained. In FIGS. 4 and 5, the ground shell 14 of the plug 11 faces the upper jaw portions 23a, particularly the recesses 23c thereof, of the contacts 23 so that the cam operating portion 24a of the actuator 24 is disposed between the upper jaw portions 23a and the ground shell 14. Since the connection object 13 and the contacts 23 are not yet normally connected together, signal lines can be said to be in a non-connected state, while, since the receptacle-side shell 25 and the ground shell 14 are in contact with each other, grounding is connected.
Then, the actuator 24 is operated to rotate in a clockwise direction in FIG. 5. As a consequence, the state of FIGS. 6 and 7 is obtained. Following the rotation of the actuator 24, the cam operating portion 24a is rotated on the ground shell 14 to give a mutually separating force to the upper jaw portions 23a of the contacts 23 and the fitting portion 11a of the plug 11. That is, the push-up force is exerted on the upper jaw portions 23a of the contacts 23. As a result, the lower jaw portions 23b of the contacts 23 are raised so that the contact points 23d are pressed onto the connection object 13. In this event, since the push-down force is exerted on the fitting portion 11a of the plug 11, the contacts 23 are electrically connected to the connection object 13 through the contact points 23d. Accordingly, grounding is connected and further the signal lines are connected so that a normal connection state of the plug 11 and the receptacle 21 is obtained.
When the actuator 24 is operated, since the plastic cam operating portion 24a is rotated on the metal ground shell 14, this causes a sliding between the different kinds of materials so that the coefficient of friction is small as compared with a sliding between plastics. Therefore, it is possible to reduce the generation of abrasion powder.
Since the fitting portion 11a of the plug 11 has a structure in which the connection object 13, the plate-like portion 16, and the ground shell 14 are stacked together, the contact opening in the receptacle 21 is designed to be large corresponding thereto so that each contact 23 as a whole has a flexible spring structure, and therefore, high contact reliability is obtained even with the thickness variation of the connection object 13. As a consequence, it is possible to easily cope with the thickness variation of the connection object 13 within tolerance to thereby enhance the contact stability.
As described above, according to the connector 10, since the cam operating portion 24a of the actuator 24 is rotated on the ground shell 14 which is made of the material different from that of the cam operating portion 24a, it is possible to make the coefficient of friction small to thereby reduce the generation of abrasion powder and, further, it is possible to easily cope with the thickness variation of the connection object 13 within tolerance to thereby enhance the contact stability.
While the description has been given of the case where the so-called ZIF type contact which is designed so that the insertion force of the fitting portion 11a of the plug 11 becomes zero is used as each contact 23, use may alternatively be made of a so-called LIF (Low Insertion Force) type contact which is designed so that the insertion force of the fitting portion 11a of the plug 11 is reduced.
This invention is not limited to the above-mentioned embodiment and a part or the whole thereof can also be described as the following supplementary notes but is not limited thereto.
(Supplementary Note 1)
A connector comprising a plug and a receptacle which are adapted to be fitted together,
wherein the plug comprises a plate-like or sheet-like connection object, a ground shell which is disposed on one surface side of the connection object so as to be spaced apart from the connection object, and a guide covering front end portions of the connection object and the ground shell, and
wherein the receptacle comprises a contact and an actuator having a cam operating portion which is made of a material different from that of the ground shell and, when the actuator is operated in a state where the plug and the receptacle are fitted together, the cam operating portion is rotated on the ground shell to press the connection object onto the contact.
(Supplementary Note 2)
The connector according to supplementary note 1, wherein the cam operating portion is made of a plastic and the ground shell is made of a metal.
(Supplementary Note 3)
The connector according to supplementary note 1 or 2, wherein the plug further comprises an insulator interposed between the connection object and the ground shell, and wherein the guide is integrally formed with the insulator.
(Supplementary Note 4)
The connector according to any one of supplementary notes 1 to 3, wherein the contact has an upper jaw portion that faces the ground shell when the plug and the receptacle are fitted together, and wherein the cam operating portion is disposed between the upper jaw portion and the ground shell.
(Supplementary Note 5)
The connector according to supplementary note 4, wherein the contact has a lower jaw portion that faces an opposite surface of the connection object when the plug and the receptacle are fitted together, and wherein the lower jaw portion has a contact point for contact with the connection object.
(Supplementary Note 6)
The connector according to supplementary note 5, wherein the receptacle further comprises a housing receiving therein the contact, and wherein the contact further has a to-be-held portion held by the housing and a flexible connecting portion connecting the upper jaw portion and the lower jaw portion to the to-be-held portion so that the connecting portion makes the upper jaw portion and the lower jaw portion movable in the housing.
(Supplementary Note 7)
The connector according to supplementary note 6, wherein the receptacle further comprises a receptacle-side shell attached to the housing, and wherein when the plug is inserted into the receptacle, the ground shell is brought into contact with the receptacle-side shell.
(Supplementary Note 8)
The connector according to any one of supplementary notes 1 to 7, wherein the contact is of a LIF type.
(Supplementary Note 9)
The connector according to any one of supplementary notes 1 to 7, wherein the contact is of a ZIF type.
While the invention has been particularly shown and described with reference to exemplary embodiments thereof, the invention is not limited to these embodiments. It will be understood by those of ordinary skill in the art that various changes in form and details may be made therein without departing from the spirit and scope of the present invention as defined by the claims.

## Claims

1. A connector comprising a plug and a receptacle which are adapted to be fitted together,
wherein the plug comprises a plate-like or sheet-like connection object, a ground shell which is disposed on one surface side of the connection object so as to be spaced apart from the connection object, and a guide covering front end portions of the connection object and the ground shell, and
wherein the receptacle comprises a contact and an actuator having a cam operating portion which is made of a material different from that of the ground shell and, when the actuator is operated in a state where the plug and the receptacle are fitted together, the cam operating portion is rotated on the ground shell to press the connection object onto the contact.

2. The connector according to claim 1, wherein the cam operating portion is made of a plastic and the ground shell is made of a metal.

3. The connector according to claim 1, wherein the plug further comprises an insulator interposed between the connection object and the ground shell, and wherein the guide is integrally formed with the insulator.

4. The connector according to claim 1, wherein the contact has an upper jaw portion that faces the ground shell when the plug and the receptacle are fitted together, and wherein the cam operating portion is disposed between the upper jaw portion and the ground shell.

5. The connector according to claim 4, wherein the contact has a lower jaw portion that faces an opposite surface of the connection object when the plug and the receptacle are fitted together, and wherein the lower jaw portion has a contact point for contact with the connection object.

6. The connector according to claim 5, wherein the receptacle further comprises a housing receiving therein the contact, and wherein the contact further has a to-be-held portion held by the housing and a flexible connecting portion connecting the upper jaw portion and the lower jaw portion to the to-be-held portion so that the connecting portion makes the upper jaw portion and the lower jaw portion movable in the housing.

7. The connector according to claim 6, wherein the receptacle further comprises a receptacle-side shell attached to the housing, and wherein when the plug is inserted into the receptacle, the ground shell is brought into contact with the receptacle-side shell.

8. The connector according to claim 1, wherein the contact is of a LIF type.

9. The connector according to claim 1, wherein the contact is of a ZIF type.