JP3047650B2 - Two-stage switching seesaw switch and two-stage switching seesaw switch system using the same - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a two-stage seesaw switch mainly used for adjusting a zoom speed of a video camera and the like, and a two-stage seesaw switch system using the same.

[0002]

2. Description of the Related Art As an example of a two-stage seesaw switch, a seesaw switch in which two swing members are mounted on a swingable operation key, and each of the swing members opens and closes two sets of switch contacts. Are known.

The conventional two-stage see-saw switch will be described with reference to FIGS. According to FIG.
Bearing keys 5, 5 are provided on the lower surfaces at both ends of an operation key 4, which is swingably mounted around a shaft 3 on a base 2 provided integrally with the operation key 4.
The inverted T-shaped swinging members 6, 6a are attached to the bearing pieces 5, 5a so as to be swingable about the shafts 7, 7a.

[0006] Bowl-shaped elastic bodies 8 a to 8 swelled from rubber plate 9 are provided on the lower surfaces of the right and left ends of swing members 6 and 6 a, respectively.
d is provided in contact with each other, 8b and 8c are thin,
8a and 8d are configured to be thick.

The central part of all the bowl-shaped elastic bodies 8a to 8d is a thick disk part 11 and conductive movable contacts 12a to 12d are fixed to the lower surface thereof.
A pair of fixed contacts 13a to 13d are formed by printing on the substrates opposing below a to 12d, respectively.

Next, the operation will be described with reference to FIGS. 7A to 7C. When the upper right side of the operation key 4 is pressed from the state of FIG. 7A, as shown in FIG. Meanwhile, the operation key 4 rotates to the right around the shaft 3 to push down the shaft 7a, and accordingly the swinging member 6a is pushed down to push the bowl-shaped elastic bodies 8a, 8b downward. First, only the thin bowl-shaped elastic body 8b is concavely deformed and deformed, and the movable contact 12b is deformed.
To short-circuit the fixed contact 13b.

Furthermore, when strongly pressed operation key 4, a thick film of cup-shaped elastic member 8a also deformed recessed as shown in FIG. 7 (c), short-circuits the fixed contact 13 _1.

After that, when the pressing of the operation key 4 is released, the operation key 4 is pushed back by the elastic restoring force of the bowl-shaped elastic bodies 8a and 8b, and the state shown in FIG. 6 is again obtained.

The same operation is performed when the left upper surface of the operation key 4 is pressed.

[0010]

However, in the above-mentioned conventional two-stage changeover seesaw switch, two swing members 6, 6a and four bowl-shaped elastic bodies 8a to 8d are used as constituent parts.
And four sets of switch contacts 12a, 1 provided on the lower surface thereof.
A large number of parts such as 2a to 12d and 13a to 13d are required, and the man-hours required to assemble them are high. Therefore, the cost is high, and the height and length are large, which is disadvantageous in terms of downsizing the switch. .

The present invention has been made to solve such a conventional problem, and has a small number of components, is easily miniaturized, and has a particularly high cost.
An object of the present invention is to provide a two-stage changeover seesaw switch having a small size .

[0012]

According to the present invention, in order to solve the above-mentioned problems, a projection is provided instead of two bearing pieces on the lower surface of an operation key of a seesaw switch, and one projection is provided instead of two swing members. By providing a driving plate positioned so as to be able to move up and down, the switching order of the two sets of switch contacts is changed according to the seesaw direction of the operation key, and a two-stage switching operation is performed in each direction. It is to try.

[0013]

By changing the switching order of the two sets of switch contacts as described above, a two-stage switching seesaw switch having a small number of components is realized.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of a two-stage changeover seesaw switch of the present invention will be described with reference to FIGS.

[0015] In the figure, a hollow operation keys consisting of molded resin 21, the pressing operation portion 2 in the left-right symmetric positions of the upper surface
2, 22a, and projections 23, 23a are provided at two points equidistant from the center on the lower inner surface, and concentric support holes 24, 24a are provided at the lower end of the center front and rear surfaces.
Is held so as to be able to swing.

[0016] 25 is a substrate made of a molding resin, in upper central longitudinal concentric shaft 26,26a is the operation keys 21
The operation key 21 is supported by being fitted into the support holes 24, 24a at the center lower end, and a flat driving plate 27 is vertically moved by two bosses 28, 28a on the upper surface of the base 25 between the support shafts 26, 26a. It is movably positioned, and its upper surface is
The right and left projections 23, 23a are in contact with the lower ends thereof.

The left and right protrusions 2 on the lower surface of the drive plate 27
7a and 27b are provided with left and right protrusions 23 of the operation key 21;
The central disk portions 31, 31a of the two bowl-shaped elastic bodies 30, 30a bulging out from the rubber plate 29 and having substantially the same elastic force abut at positions equidistant from the center on the left and right sides outside the center 23a. I have.

Two electrically conductive movable contacts 32, 32a are fixed to the lower surfaces of the disk portions 31, 31a, and a pair of two fixed contacts 33, 33a are formed on the base 25 facing below the movable contacts 32, 32a. Print formed.

The outer peripheral wall 21a of the operation key 21 is
Covers the periphery of the rubber plate 29 forming the moving contacts 32 and 32a
The size is set.

Next, the operation when the operation key 21 of the two-stage changeover seesaw switch is operated by a seesaw will be described.

First, in the neutral state shown in FIG. 1, two left and right bowl-shaped elastic bodies 30, 30a are in elastic contact with the left and right projections 23, 23a of the operation key 21 via the drive plate 27. The operation key 21 is maintained in a neutral state without rattling.

Next, a right pressing operation section 22a of the operation key 21
When the key is pressed, the operation key 21 rotates and swings around the support shafts 26 and 26a, and as shown in FIG. 3, the projection 23a attempts to push the drive plate 27 downward.

Here, as shown in FIG.
Left and right projections 23, 23a and left and right bowl-shaped elastic bodies 30, 3
0a of the disk portions 31, 31a, that is, the left of the lower surface of the drive plate 27.
The distance between the right protrusion 27a and the right protrusion 27b is defined as: (projection 23 to protrusion 27a ) = (projection 23a to protrusion 27).
b ) = B, (projection 23 to projection 23a) = C, and W is the pressing force of the projection 23a, and the force Fa applied to the disk portion 31 via the projection 27b of the driving plate 27 is The force Fb applied to the disk portion 31a is expressed as follows.

[0024]

(Equation 1)

[0025]

(Equation 2)

As is clear from the above, since a larger force is applied to the disk portion 31a, if the force exceeds the elastic force of each of the bowl-shaped elastic bodies 30, 30a, the bowl-shaped elastic body 30a first becomes concave. The movable contact 32a descends to short-circuit the fixed contact 33a as the first contact.

The projection of this time, the driving plate 27 on the circular plate portion 31
Tilt 27a as a fulcrum. Thereafter, increasing the force applied further to the right pushing operation section 22a of the operation keys 21, as shown in FIG. 4, while recessed in a bowl-shaped elastic bodies 30a, i.e. not move while the fixed contact 33a is short-driven Projection 2 of plate 27
When the force applied to the disc portion 31 via the contact 7a increases and the force exceeds the elastic force of the bowl-shaped elastic body 30, the bowl-shaped elastic body 30 is concavely deformed and deformed, and the movable contact 32 is moved. Descend,
The fixed contact 33 serving as the second contact is short-circuited.

At this time, the drive plate 27 is protruded from the disk portion 31a.
The portion 27b is tilted with the fulcrum as a fulcrum, and becomes horizontal at a position where it is lowered.

Thereafter, the right pressing operation section 22 of the operation key 21
When the pressing force applied to a is removed, the bowl-shaped elastic bodies 30 and 30a, which have been concavely recessed, return to the original bowl-like shape, and the respective disc portions 31 and 31a project from the protrusions 27.
By pushing up the drive plate 27 through the control keys 21a and 27b, the protrusion 23a of the operation key 21 is pressed.
To the original neutral position, and the short-circuited fixed contacts 33a and 33 return to the original open state.

Similarly, when the operation key 21 is swung by pressing the left pressing operation portion 22 of the operation key 21, first, the bowl-shaped elastic body 30 is depressed and deformed, and the movable contact 33 is used as the first contact. Short-circuiting occurs, then the bowl-shaped elastic body 30a is depressed, and the fixed contact 33a is short-circuited as a second contact.

FIG. 5 is a conceptual view of a two-stage seesaw switch system used for zoom adjustment of a video camera using the two-stage seesaw switch of the present invention. Reference numeral 34 denotes a movable contact 32a and a fixed contact 33a. A first switch section 35 is a second switch section including a movable contact 32 and a fixed contact 33, and a first switch section 36 includes a first switch section 34 and a second switch section 35 in FIG. It is a two-stage changeover seesaw switch described.

37 is a two-stage changeover seesaw switch 36
Is operated, whether the first switch unit 34 or the second switch unit 35 is turned on is detected, and when the other switch unit that has not been turned on is turned on, the on state is detected. These are detection means for outputting each as an electric signal to the device main body side (not shown).

Next, the operation of the two-stage see-saw switch system will be described. First, when the first switch section 34 is turned on in advance in the microcomputer of the main body of the apparatus, zooming is performed at a very low speed on the "telephoto side". When the second switch unit 35 is turned on first, the "wide angle side"
The zooming is performed at a very low speed, and then when the other switch is turned on, the zooming is performed at a high speed.

That is, the two-stage changeover seesaw switch 3 shown in FIG.
When the first switch section 34 is turned on by pressing the right pressing operation section 22a of No. 6, the detection means 37 detects this and outputs it as a first signal to a microcomputer (not shown) on the device body side. At this time, when the second switch unit 35 is turned on by further applying a force to the right pressing operation unit 22a, the detection unit 37 detects and outputs as a second signal to the microcomputer on the device body side. The microcomputer on the side of the device which has received the signal first starts low-speed zooming to the telephoto side, and outputs a command for performing high-speed zooming by the next signal.

Although the detecting means 37 is provided separately from the microcomputer on the device main body side in the above embodiment, it may be provided integrally with the microcomputer on the device main body side, which contributes to reduction of the number of parts and cost. Is what you do.

[0036]

The two-stage changeover seesaw switch according to the present invention has the following advantages. (1) Since the number of components is small and the number of components is small, material costs and assembly costs are low.

(2) The overall height and length of the seesaw switch can be greatly reduced, which is advantageous for miniaturization.

(3) A switch contact portion on the outer peripheral wall of the operation key
Because it covers the that have dust resistance is excellent. And the like.

[Brief description of the drawings]

FIG. 1 is a front sectional view of an embodiment of a two-stage changeover seesaw switch of the present invention.

FIG. 2A is a cross-sectional view of the same side, and FIG. 2B is a cross-sectional view taken along the line AA 'in FIG.

FIG. 3 is a front sectional view of an operation state in which only the first contact is short-circuited;

FIG. 4 is a front sectional view of an operation state in which the second contact is also short-circuited;

FIG. 5 is a conceptual diagram of a system of an application example used for zoom adjustment of the video camera.

FIG. 6 is a front sectional view of a conventional two-stage changeover seesaw switch.

FIGS. 7A to 7C are schematic diagrams illustrating the same operation state.

[Explanation of symbols]

Reference Signs List 21 operation key 23 protrusion 25 base 26 support shaft 27 drive plate 27a, 27b protrusion 32, 32a movable contact 33, 33a fixed contact 34 first switch 35 second switch 37 detecting means

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-59-184410 (JP, A) JP-A-8-7701 (JP, A) Japanese Utility Model 58-131537 (JP, U) Japanese Utility Model Utility Model Sho 60- 78542 (JP, U) (58) Fields investigated (Int. Cl. ⁷ , DB name) H01H 23/00 H01H 23/30

Claims (2)

(57) [Claims] 1. A method according to claim 1, wherein the two substrates are arranged at a predetermined interval on a substrate.
One fixed contact and the top of each fixed contact,
And two movable elastic contacts elastically deformed by the pressing, on the substrate
Swing the lower end of the middle point between the two fixed contacts
And supported above and around the movable contact.
At the lower left and right inner sides of the two fixed contacts.
An operation key having a raised, positioning the vertically movable by the substrate
Is because held, the lower end of the projection of the top surface operation keys, the lower surface of the butt
Two-stage changeover seesaw switch part is a driving plate disposed so as to contact the respective upper ends of the movable elastic contacts. Wherein both by forming the first and second switch portions between two fixed contacts and two movable contacts, the first
Or when on one of the second switching unit, when either the switch unit is output to both main unit when detecting whether ON, next the other switch unit is turned on,
2. A two-stage seesaw switch system using a two-stage seesaw switch according to claim 1, further comprising a detecting means for detecting the ON state of the switch and outputting the ON state to the main device.