Composite switch for electronic apparatus

Abstract: A switching operation in a rotational direction is performed by deforming a contact spring (10) by a cam (8) fixed in such a manner as to follow to a button shaft (3) so as to connect electrodes, and a switching operation in a pressing down direction is performed by deforming a contact spring (11) provided at a lower end of the button shaft so as to connect an electrode. Further, a rotational direction returning spring (5) and a pressing direction returning spring (7) are provided in an inner portion of the button, thereby automatically returning the button (2) to a predetermined position. Further, the structure is made such that at a time of the button rotating operation, a lower surface of an outer wall of the button comes close to an upper surface of a button receiving table provided in a case (1) so as to be layered in a plane manner, thereby preventing a switch function from being erroneously operated.

Description: The invention relates to a composite switch for an electronic apparatus having a plurality of switch functions in one switch mechanism. In a structure of a conventional switch, in order to obtain a plurality of switch functions, a rotational direction switch and a pressing down direction switch are separately and independently provided, respectively. For example, at a time of an input operation of information in a portable information apparatus, in order to select letters and symbols to be input and corrected, switches for moving a cursor at least require totally three switches comprising two switches for searching a front portion and searching a rear portion, a switch for determining a letter and a symbol to be input and corrected, so that it is necessary to frequently replace fingers at every time of the operation. Further, a frequency is further increased as an amount of information to be input and corrected is increased. In a structure of the conventional switch, since a moving direction of the switch is different between the rotational direction and the pressing down direction, it is unavoidable that they independently exist. Accordingly, it is troublesome to replace the fingers and it is complex to operate the button. Further, there is a problem that a restriction in determining a design of a product is increased due to an arrangement of a plurality of buttons. Document US-A-4186284 discloses a composite switch for an electronic apparatus structured such that: a button shaft axially supported in a slidable manner is provided in a through hole directing from an outer portion of a case toward an inner portion in which a module of an electronic apparatus exists, a button is fixed to an outer end portion of the button shaft disposed on the outer portion of the case, a cam is fixed to an inner end portion of the button shaft disposed on the inner portion of the case, wherein switch functions are provided at a front end of the button shaft for turning on a pressing down switch electrode, mounted to the module, via the front end of the button shaft when pressing down the button and at a part of an outer shape of the cam, whereby the cam rotates in accordance with the rotation of the button, so that by rotating the button, rotating switch electrodes mounted on the module are turned on. In order to solve the problems mentioned above, in accordance with the present invention there is provided a composite switch for an electronic apparatus structured such that a button shaft axially supported in a slidable manner is provided in a through hole directing from an outer portion of a case toward an inner portion in which a module of an electronic apparatus exists, a button is fixed to an outer end portion of the button shaft disposed on the outer portion of the case, a cam is fixed to an inner end portion of the button shaft disposed on the inner portion of the case, and switch functions are provided at a front end of the button shaft and at a part of an outer shape of the cam, a rotation returning spring which stands against a rotational force of the button is received within the button, and a pressing down returning spring which stand against a pressing down force of the button is received in a periphery of the button shaft and between the case and the button, thereby providing a switch function for turning on a pressing down switch electrode mounted to the module via the front end of the button shaft when pressing down the button and turning off the pressing down switch electrode when cancelling the pressing down operation, and the cam rotates in accordance with the rotation of the button, so that by rotating the button, rotating switch electrodes mounted on the module are turned on and the rotating switch electrodes are turned off when cancelling the rotation. A preferred form of the present invention is illustrated in the accompanying drawings in which: Fig. 1 is a cross sectional view of a normal state of a composite switch for an electronic apparatus; Fig. 2 is a cross sectional view which shows a state of pressing down the composite switch for the electronic apparatus; Fig. 3 is a cross sectional view as seen from a line A-A in Fig. 1 which shows the normal state of the composite switch for the electronic apparatus; Fig. 4 is a cross sectional view as seen from a line B-B in Fig. 1 which shows the normal state of the cam portion in the composite switch for the electronic apparatus; Fig. 5 is a cross sectional view as seen from a line A-A in Fig. 1 which shows a state at a time of a rotating operation of the composite switch for the electronic apparatus; Fig. 6 is a cross sectional view as seen from a line B-B in Fig. 1 which shows a state of the cam portion at a time of the rotating operation of the composite switch for the electronic apparatus; Fig. 7A is a cross sectional view as seen from a line C-C in Fig. 1 which shows the normal state of the composite switch for the electronic apparatus; and Fig.7B is a cross sectional view as seen from a line C-C in Fig. 1 at a time of the rotating operation of the composite switch for the electronic apparatus. The invention is structured such that a button (2) rotating or vertically moving in accordance with a movement of a finger is provided in an upper portion of one button shaft (3), a rotation returning spring (5) and a pressing down returning spring (7) are provided in an inner portion of the button (2), and a water proof packing (4) is provided in a sliding portion between the button shaft (3) and a case (1). It is structured such that a cam (8) is fixed to a lower end portion of the button shaft (3) and an upper surface of the cam (8) is brought into contact with an inner surface of the case (1) so as to receive a spring force of the pressing down returning spring (7). Rotational direction contact springs (10, 10) and rotating switch electrodes (12, 13) are provided in an outer side of the cam (8), whereby the rotational direction contact springs (10, 10) are elastically deformed due to a rotation of the cam (8) in accordance with the rotation of the button shaft (3) so as to be connected to the rotating switch electrodes (12, 13), and a pressing down direction contact spring (11) elastically deforming due to a vertical motion of the button shaft (3) and the pressing down switch electrode (14) are provided in a lower end portion of the button shaft (3). Further, the structure is made such that at a time of rotating the button, a lower surface (2a1) of an outer wall (2a) of the button comes close to an upper surface (15a) of a button receiving table (15) provided in the case (1) so as to be layered in a plane manner. An embodiment will be described below with reference to the accompanying drawings. In Fig. 1, a rotation returning spring (5) is mounted to an inner portion of a button (2). A groove (21)capable of receiving the rotation returning spring (5) at this time is defined in the inner portion of the button (2) by a button outer wall (2a), a button inner wall (2b) and a button top wall (2c). The rotation returning spring (5) is mounted to the groove (21) using the button shaft (3) as a guide, and a seat (6) is brought into contact with the lower surface of the button inner wall (2b) using the button shaft (3) as a guide within the groove (21), thereby pressing as a receiving member for the rotation returning spring (5). Next, after setting the pressing down returning spring (7) using the button shaft (3) as a guide, the pressing down returning spring (7) is inserted to a recess portion (31) of the case (1). At this time, the pressing down returning spring (7) is held between the receiving surface (1a) of the pressing down returning spring (7) of the case (1) and the seat (6) with a spring characteristic in an axial direction. The upper surface of the cam (8) fixed to the lower end portion of the button shaft (3) is brought into contact with the inner surface of the case (1) and receives a reaction force of the pressing down returning spring (7), thereby securing a normal position of the button (2). A water proof packing (4) is previously assembled at a predetermined position in the button shaft (3). The water proof packing (4) elastically deforms with respect to an inner wall (1b) of a through hole (41) of the case (1) so as to become slidable, thereby securing a water proof performance. Fig. 4 is a cross sectional view as seen from B-B in Fig. 1 showing a normal state of a cam portion in the composite switch for the electronic apparatus. As shown in Fig. 4, a cam (8) formed in an oval shape is eccentrically inserted and fixed to a front end portion of the button shaft (3) inserted after passing through the case (1). That is, a notch (3a) is provided in an insertion portion of the cam (8) at the front end of the button shaft (3) as shown in Fig. 4 and a rectangular hole (8a) of the cam is engaged therewith in correspondence to a shape of the notch (3a), whereby the cam (8) follows a rotational motion of the button shaft (3) and can be rotated. After inserting the cam (8) to the front end portion of the button shaft (3), the cam (8) is fixed by an E ring (9) near the front end of the button shaft (3), as shown in Fig. 1. As shown in Figs. 1 and 4, rotational direction contact springs (10, 10) supporting both ends to the module (50) of the electronic apparatus and mounted as a both end supporting beam are arranged in both sides of the cam (8) in an inner portion of the case (1), and a pair of rightward rotation switching electrodes (12) mounted on a wall surface of the module (50) and a pair of leftward rotation switching electrodes (13) are arranged in an outer side thereof. Further, as shown in Fig. 1, the pressing down direction contact springs (11) respectively mounted to the module (50) are arranged in a lower portion of the front end (3a) of the button shaft (3) positioned below the cam (8), and a pair of pressing down switching electrodes (14) are arranged in a further lower portion. In this case, the pressing down direction contact spring (11) is formed by an insulative elastic rubber, and a conductive sheet (11a) opposing to the pressing down switch electrode (14) is provided on the lower surface. Fig. 2 is a cross sectional view at a time of a pressing down operation of the button (2). When pressing down an upper surface (2e) of the button (2) by fingers, the pressed down button shaft (3) elastically deforms and presses down the pressing down direction contact spring (11) placed in the lower portion of the cam (8), and further connects a pair of pressing down switch electrodes (14) arranged in the lower portion to the conductive sheet (11a), so that the switch is turned on. Thereafter, when releasing the fingers from the button (2), the button (2) is automatically returned to an original position shown in Fig. 1 due to a restoring force of the pressing down returning spring (7) compressed by the pressing down operation. Further, the pressing down direction contact spring (11) is also returned to an original position shown in Fig. 1 due to an elastic restoring force of the pressing down direction contact spring (11) itself. A receiving state of the rotation returning spring (5) mounted to the inner portion of the button (2) is shown in Figs. 1 and 3. At this time, both ends (5a) of the rotation returning spring (5) receive a releasing force of the spring on a spring locking surface (2d) of the button (2) and are received in a groove (21) of the button (2), and front ends of the both ends (5a) of the rotation returning spring (5) are arranged and assembled within a space portion (61) of the case (1). In a series of operations, the rotation returning spring (5) is pressed in an upward direction of the inner portion of the button (2) due to a press insertion of the seat (6) and follows a vertical motion of the button (2). Fig. 3 is a cross sectional view as seen from a line A-A in Fig. 1 in a normal state of the button (2), and shows a neutral position of the button (2). Fig. 5 is a cross sectional view as seen from a line A-A in Fig. 1 which shows a state of the rotation returning spring (5) disposed in the inner portion of the button (2) at a time of a rightward rotating operation of the button (2). When the button (2) rotates in a rightward direction from the position shown in Fig. 3 showing a neutral position, an end portion (5a) of the rotation returning spring (5) is locked with the spring lock surface (1d) of the case (1), and the other end portion (5a) of the rotation returning spring (5) receives a rotational force from the spring lock surface (2d) of the button (2) and rotates to a predetermined position. At this time, the cam (8) rotates in a rightward direction from a neutral position shown in Fig. 4 so as to be in a state shown in Fig. 6, and a part (8b) of the outer shape of the cam (8) is pressed to the rotational direction contact spring (10). Fig. 6 is a cross sectional view of the cam (8) portion as seen from a line B-B in Fig. 1 when the button (2) is rotated in a rightward direction. That is, generally explaining, the button shaft (3) rotated in an optional direction by the rotating operation of the fingers rotates the cam (8) placed in such a manner as to follow to the rotation of the button shaft (3), elastically deforms the rotational direction contact spring (10) arranged in both sides of the cam (8) so as to press down, and further the rotational direction contact spring (10) is connected to a pair of rightward rotation switching electrodes (12) arranged in the outer side thereof or to a pair of leftward rotation switching electrodes (13), so that the switch is turned on. Thereafter, when releasing the fingers from the button (2), the button (2) is automatically returned to the neutral position shown in Fig. 3 due to a reaction force of the rotation returning spring (5) deformed by the spring lock surface (2d) disposed in the inner portion of the button and the spring lock surface (1d) of the case by the rotating operation. Further, the rotational direction contact spring (10) is returned to the original position shown in Fig. 3 due to an elastic restoring force of the rotational direction contact spring (10) itself. A description will be given of a structure for preventing an erroneous operation in the switch function at a time of the rotating operation of the composite switch for the electronic apparatus with reference to Figs. 7A and 7B. Fig. 7A is a cross sectional view as seen from a line C-C in Fig. 1 which shows a normal state of the composite switch for the electronic apparatus. Fig. 7B is a cross sectional view as seen from a line C-C in Fig. 1 at a time of a rotating operation of the composite switch for the electronic apparatus. The structure is made such that at a time of the rotating operation of the button (2), a lower surface (2a1) of an outer wall (2a) of the button comes close to an upper surface (15a) of a button receiving table (15) provided in the case (1) so as to be layered in a plane manner, and so as not to be layered in a plane manner in the normal state of the button (2). In the structure mentioned above, the structure is made such that even when the pressing down force is accidentally operated at a time of the rotating operation of the button (2), the lower surface (2a1) of the outer wall (2a) of the button (2) is brought into contact with an upper surface (15a) of the button receiving table (15). The invention is performed in an aspect mentioned above, and the following effects can be obtained. Since a whole of the apparatus is made compact and a water proof structure can be realized by providing the rotation returning spring (5), the seat (6), the button (2) for receiving the pressing down returning spring (7), the water proof packing (4) and the cam (8) on the axis of one button shaft (3), a product design is not limited and a compact and advantageous design can be performed. Further, since the structure is made such that it is impossible to press down the button at a time of the rotating operation of the button and the rotating operation and the pressing down operation can be performed by one button, an erroneous operation of the switch function is prevented and it is unnecessary to replace the fingers, so that an operation can be easily and securely performed. Since the button (2) is always automatically returned to the neutral position by the rotation returning spring (5) and the button (2) is always automatically returned to the predetermined position by the pressing down returning spring (7), the operation of the button can be easily performed.

Claims: A composite switch for an electronic apparatus structured such that a button shaft (3) axially supported in a slidable manner is provided in a through hole directing from an outer portion of a case (1) toward an inner portion in which a module of an electronic apparatus (50) exists, a button (2) is fixed to an outer end portion of the button shaft (3) disposed on the outer portion of the case (1) a cam (8) is fixed to an inner end portion of the button shaft disposed on the inner portion of the case, and switch functions are provided at a front end of the button shaft and at a part of an outer shape (8b) of the cam, a rotation returning spring (5) which stands against a rotational force of the button is received within the button (2) and a pressing down returning spring (7) which stand against a pressing down force of the button (2) is received in a periphery of the button shaft (3) and between the case (1) and the button (2) thereby providing a switch function for turning on a pressing down switch electrode (14), mounted to the module, via the front end of the button shaft (3a) when pressing down the button (2) and turning off the pressing down switch electrode (14) when cancelling the pressing down operation, and the cam (8) rotates in accordance with the rotation of the button (2) so that by rotating the button, rotating switch electrodes (12; 13) mounted on the module are turned on and the rotating switch electrodes (12, 13) are turned off when cancelling the rotation. A composite switch for an electronic apparatus as claimed in claim 1, wherein the slidably axial support portion provided in the button shaft (3) in correspondence to the through hole (1b) of the case is constituted by a water proof packing (4). A composite switch for an electronic apparatus as claimed in claim 1, wherein the cam (8) rotates in rightward and leftward directions in accordance with the rightward and leftward rotation of the button (2) and by rotating rightward and leftward the button, rightward and leftward rotating switch electrodes(12; 13) mounted on the module are turned on and the rightward and leftward rotating switch electrodes (12, 13) are turned off when cancelling the rightward and leftward rotation of the button. A composite switch for an electronic apparatus as claimed in claim 1 or 3, wherein a pressing down direction contact spring (11) having a conductive member (11a) in opposite to the pressing down switch electrode (14) is arranged between the front end (3a) of the button shaft (3) and the pressing down switch electrode (14) mounted to the module, and a rotational direction contact spring (10) is arranged between the cam (8) and the rotating switch electrodes (12, 13) mounted to the module. A composite switch for an electronic apparatus as claimed in claim 1 or 3, wherein both ends (5a) of the rotation returning spring (5) receive a releasing force of the spring on a spring lock surface (2d) in the button (2) at a neutral position in a normal state of the button (2), the rotation returning spring (5) is received within a groove (21) of the button (2), one end (5a) of the rotation returning spring (5) receives the releasing force of the spring on a spring lock surface (1d) in the case (1) and another end (5a) of the rotation returning spring (5) receives the releasing force of the spring on the spring lock surface (2d) in the button (2) at a rotating operation of the button (2), the cam (8) rotating in accordance with the rotation of the button shaft (3) is kept in a non-contact state with respect to rotational direction contact springs (10) arranged in both sides of the cam (8) and the rotating switch electrodes (12, 13) at a neutral position in the normal state of the button(2) and at a time of the rotating operation of the button (2), the cam (8) is pressed to the rotational direction contact springs (10), the rotational direction contact springs being brought into contact with the rotating switch electrodes (12, 13) mounted to the module, so that the rotating switch electrodes (12, 13) are turned on. A composite switch for an electronic apparatus as claimed in any one of claims 1 to 4, wherein at a time of the rotating operation of the button (2), a lower surface of an outer wall (2a) of the button (2) comes close to an upper surface (15a) of a button receiving table (15) provided in the case (1) so as to be layered in a plane manner, while in a normal state of the button, it is arranged in such a manner as not to be layered in a plane manner.

Inventors: MATSUI TSUYOSHI, MATSUI, TSUYOSHI
Applicants: SEIKO INSTR INC, SEIKO INSTRUMENTS INC.
Application year: 1999
Main classification: H01H25
IPC codes: G04B37, H01H25, H01H9, H01H21, H01H19, G04G21