JPH0279312A - Pushbutton switch - Google Patents

Abstract

PURPOSE:To achieve miniaturization by obtaining switching operation of a pair of fixed contacts and reversing operation of a reversing spring in time series by the effect of movement of the spring in association with sliding movement of a pushbutton. CONSTITUTION:Upon pushing-down of a reversing spring 4 through a pushbutton 3, the spring 4 at its center is convexly reversed so as to generate click touch, and at the same time, it is shorted to a first fixed contact 5 with a pair of second fixed contacts 6 and 7 kept to be shorted therebetween. The short between the first fixed contact 5 and the spring 4 at its center leads to conductance between the first fixed contact 5 and the second fixed contacts 6 and 7. On the contrary, upon stopping of the pushing-down of the pushbutton 3, the returning force of a return coil spring 11 forcibly lifts up the spring 4. simultaneously, reversing action of the spring 4 generates the click touch, and as well, the spring 4 separates from the first and second fixed contacts 5, 6 and 7 in time series order. Therefore, miniaturization can be achieved.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention provides a push button type device that can operate a plurality of electric circuits in chronological order with a clicking sensation during one stroke of the push button. Regarding switches.

(Prior Art) In a camera release mechanism, for example, as a control circuit is schematically shown in FIG. A switch section 53 is provided in the release section, and the first switch section 51 and the second switch section 52 can be opened and closed by operating the same release button. In addition, in this release mechanism, as shown in the time chart of each switch section 51 and 53 in FIG. 6, when the release button is pressed, the first switch section 51
is turned on before the second switch section 53, and power is turned on to the autofocus circuit 50 and the like before the shutter release circuit 52 operates. Therefore, in such a mechanism, during one stroke of the release button, that is, the push button member, the contact point of the first switch part 51 that starts the autofocus circuit 50 closes first, and then this first With the contact of the switch section 51 closed, the contact of the second switch section 53 is further closed, and the shutter release circuit 52 is closed.
A switch structure is required in which the power is turned on or off in chronological order in the order in which the devices are activated.

FIG. 4 shows an example of a conventional push-button switch that has a plurality of switch sections that are operated in chronological order during one stroke of the push button.

In the figure, the switch 40 includes a case 43 formed into a substantially box shape by a housing 41 and a cover 42, and a push button 44 with one end slidably disposed inside the case 43.
It is composed of a return coil spring 45, a switch element 46, a touch spring 49, and the like. Further, the switch element 46 is formed of a sliding piece 47 and a circuit board 48,
The sliding piece 47 and the push button 44 are moved integrally. When the sliding piece 47 is moved integrally with the push button 44, the tip of the sliding piece 47 is also moved while being in sliding contact with the circuit board 48. On the other hand, on the circuit board 48 that is moved while the tip of the sliding piece 47 is in contact with it, switching contacts for a plurality of switch sections are printed and wired.

In the switch 40 configured in this way, when the button 44 is pressed, the sliding piece 47 is moved integrally with the push button 44.
moves on the circuit board 48, and this movement sequentially switches the contacts of the plurality of switch sections 51, 53 in the circuit shown in FIG. 5 in chronological order. Further, when pressed, the push button 44 collides with and successively overcomes the stepped portions 49a and 49b of the feel spring 49, and at this time a click feeling is obtained. Note that the stepped portions 49a, 49 where this click feeling can be obtained
b is formed to correspond to the switching of the contacts of the switch parts 51 and 53, so that the switching of the contacts of the switch parts 51 and 53 and the click feeling can be obtained at the same time.

(Problems to be Solved by the Invention) As described above, in the push-button switch of the conventional structure, a feel spring 49 for obtaining a click feeling is separately prepared and disposed within the housing 41. Therefore, the number of parts is large, and the number of assembly steps is also increased, which is disadvantageous in terms of cost. Furthermore, since a large space is required to arrange the touch spring, there is a problem in that it is difficult to downsize the switch 40. In addition, there is also a touch spring 4.
Since the switch element 46 and the switch element 46 are independently manufactured and assembled, dimensional variations are likely to occur between each component, and manufacturing and assembly management are also required to be strictly controlled.

In addition, since a sliding type contact switch is used as the switch element 46, a large stroke of the push button 44 is required in order to obtain reliability, which causes the problem that the switch becomes large. .

The present invention has been made in view of the above-mentioned problems, and its purpose is to create a structure that can be made smaller, improve reliability and service life, and also improve assembly workability and reduce costs. The purpose of the present invention is to provide a push-button switch.

(Means for Solving the Problems) In order to achieve the above object, a push-button switch according to the present invention includes a case, a first fixed contact disposed approximately at the center of the case, and a first fixed contact disposed approximately at the center of the case. a pair of second fixed contacts disposed with the contacts in between; a return coil spring disposed within the case concentrically with the first fixed contact;
a reversal spring disposed on the return coil sling, the curved center of which corresponds to the first fixed contact, and the ends of which correspond to each of the second fixed contacts; a push button that is slidably disposed within the case with one end abutting the center thereof and is displaced in a direction away from each of the fixed contacts together with the reversal spring by the biasing force of the return coil spring; The opening/closing operation between the pair of second fixed contacts and the reversing operation of the reversing spring are obtained in chronological order by the displacement of the reversing spring linked to the sliding displacement of the push button, and the reversing operation of the reversing spring The structure is such that opening and closing operations between the first fixed contact and the second fixed contact can be obtained.

(Example) Hereinafter, an example of the present invention will be described in detail using the drawings.

1 to 3 show a push-button switch to which the present invention is applied.

In the figure, switch 1 includes case 2 and push button 32.
Reversing spring 4. First fixed contact5. A pair of second fixed contacts 6, 7. It is composed of a return coil spring 11 and the like.

More specifically, the case 2 includes a housing 8 and a cover 9. The housing 8 is formed of a resin material into a box shape with an open top surface 8a, and when molded, the first fixed contact 5 and the second fixed contacts 6, 7 are inserted into the bottom surface 8b. It has become. Also,
Locking pin portions 8c projecting upward are integrally formed at the four corners of the upper surface 8a. On the other hand, the bottom surface 8
b, a first fixed contact 5 is disposed approximately in the center with a part exposed inside the housing 8, and a part is placed inside the housing 8 on both left and right sides of the first fixed contact 5. A pair of second fixed contacts 6 and 7 are arranged so as to be exposed, respectively. Note that the lead terminal portion 5a of the first fixed contact 5, the lead terminal portion 6a of the second fixed terminal 6, and the lead terminal portion 7a of the second fixed terminal 7 are each led out to the outside of the housing 8. There is. Further, an annular groove 10 is formed in a portion of the lower surface 8b inside the housing 8 for positioning the return coil spring 11 in a state in which it goes around the first fixed contact 5.

Next, the cover 9 is formed of a metal plate, and has a through hole 9a formed in the center for protruding the push button, and a plurality of engagement holes 9b (first and second holes) corresponding to the locking bottle portion 8C. 3
(see figure) is provided. And this cover 9 is
When placed on the upper surface 8a of the housing 8, the locking pin portion 8c is inserted and engaged into the engagement hole 9b, so that the upper surface opening of the housing 8 can be closed.

The push button 3 includes a main body 3a that is slidably inserted into a through hole 9a of the cover 9, and a flange 3b that protrudes at a substantially right angle toward the outside of the left and right side surfaces 91 of the lower outer peripheral portion of the main body 3a. , and an operating portion 3C protruding downward from the center of the lower surface of the main body portion 3a, and are integrally molded from a resin material.

The reversal spring 4 is a metal plate having elasticity, and is formed into a dome shape with a raised central portion and curved into a relatively flat bowl shape. The outer diameter of the reversal spring 4 is larger than the outer diameter of the return coil spring 11.

When assembling the switch 1 made of such members, insert the lower end of the return coil spring 11 through the upper opening into the housing 8 in which the first fixed contact 5 and the second fixed contact 6 are inserted. Insert it into the groove 10 and position it.

Next, the reversal spring 4 is placed on the upper end of the return coil spring 11. In this case, it is arranged concentrically with the return coil spring 11 with its center raised upward. Further, the push button 3 is placed on this reversing spring 4, and then the cover 9 is attached to the housing 8. In this case, the main body 3a of the push button 3 passes through the through hole 9a of the cover 9 and is projected upward. In this way, each part is placed one after another, and finally, a part of the locking pin 8C of the housing 8 that penetrates the engagement hole 9b of the cover 9 and projects upward is heat or cold caulked. By fixing the cover 9 to the housing 8, the switch 1 as shown in FIGS. 1 and 2 is completed.

In this switch 1, the reversing spring 4 and the push button 3 are displaced upward by the biasing force of the return coil spring, and the flange 3b is in contact with the lower surface of the cover 9 under normal conditions. In addition, the center of the reversing spring 4 swells upward,
The operating portion 3C of the push button 3 is in contact with this central portion, and the reversing spring 4 is also not in contact with either the first fixed contact 5 or the second fixed contact 6. It's dark.

And, the push button type switch 1 configured in this way
When the reversing spring 4 is pressed together with the push button 3 against the biasing force of the return coil spring 11, the end of the reversing spring 4 first contacts the pair of second fixed contacts 6.7.
The second fixed contacts 6 and 7 are electrically connected via the reversing spring 4. Next, when the reversing spring 4 is further pressed down via the push button 3, the center of the reversing spring 4 curves and reverses, providing a click feeling and maintaining a short circuit between the pair of second fixed contacts 6 and 7. In this state, it is further short-circuited to the first fixed contact 5.

The short circuit between the first fixed contact 5 and the center portion of the reversing spring 4 establishes conduction between the first fixed contact 5 and the second fixed contacts 6 and 7. Conversely, when the pressing blade of the push button 3 is removed, the reversing spring 4 is forcibly lifted by the restoring force of the restoring coil spring 11, and at the same time, the reversing action of the reversing spring 4 is again obtained, causing a click sensation. At the same time, this reversal spring 4, the first fixed contact 5 and the second
The fixed contacts 6 and 7 are sequentially spaced apart from each other in chronological order.

In the above embodiment, the reversing spring 4 is formed into a dome shape, but it is not necessarily dome-shaped and may be a conductive spring material with a curved center.

(Effects of the Invention) As explained above, according to the push button switch according to the present invention, a click feeling can be obtained by the reversing spring, so there is no need to separately provide a spring for feeling as in the conventional switch structure. There is no need to use it, and assembly can be done by stacking. This reduces the number of parts, reduces the number of assembly steps, and simplifies assembly, reducing costs and making it possible to downsize. In addition,
Manufacturing errors between parts can also be reduced. In addition, the contact switching structure does not use a sliding switching structure, but instead has a structure in which when the push button is released, the reversing spring is forcibly pushed up together with the push button by the return biasing force of the return spring and separated. Therefore, forced switching is performed instantaneously. Furthermore, since the reversing spring is lifted by the return spring, it is possible to take a large stroke for push buttons, etc., and contact switching can be achieved reliably. This improves reliability and service life.

[Brief explanation of the drawing]

Fig. 1 is an external perspective view of a push-button switch to which the present invention is applied, Fig. 2 is a side view taken along the line ■-■ in Fig. 1, and Fig. 3 is an exploded perspective view of the same switch. Fig. 4 is a cross-sectional side view of an example of a conventional push-button switch, Fig. 5 is a schematic control circuit diagram of a general release mechanism in a camera, and Fig. 6 is a schematic control circuit diagram of the release mechanism shown in Fig. 5. FIG. 3 is a diagram showing an example of a time chart of each switch section. DESCRIPTION OF SYMBOLS 1... Switch, 2... Case, 3... Push button, 4... Reversing spring, 5... First fixed contact, 6.
7...Second fixed contact, 11...Returning coil spring. Agent: Patent Attorney Masahiro Kurao

Claims (1)

[Claims] a case, a first fixed contact arranged approximately at the center within the case, a pair of second fixed contacts arranged with the first fixed contact sandwiched therebetween, and a pair of second fixed contacts arranged concentrically with the first fixed contact. a return coil spring arranged in the case, and a return coil whose curved center corresponds to the first fixed contact and whose ends correspond to the second fixed contacts, respectively. A reversing spring disposed on the sling, one end of which is in contact with the center of the reversing spring and slidably disposed within the case, and the reversing spring and each of the fixed contacts are connected by the biasing force of the returning coil spring. a push button that is displaced in a direction of separation, and the opening/closing operation between the pair of second fixed contacts and the reversing operation of the reversing spring are performed by the displacement of the reversing spring linked to the sliding displacement of the push button. A push-button switch characterized in that the switch is obtained in chronological order and the opening/closing operation between the first fixed contact and the second fixed contact is obtained by the reversing action of the reversing spring.