JPH06187875A - Two-stage seesaw switch and two-stage seesaw switch system using it - Google Patents

Abstract

PURPOSE:To easily miniaturize an intermittent-point returning type two-stage seesaw switch with a small number of part items and to reduce the cost of the switch which is put in two-stage switching action in the seesaw direction of a seesaw type control key. CONSTITUTION:A vertically movable drive plate 27 is disposed between a control key 21 and each of two sets of switch contacts 32, 33 and 32a, 33a. The order of switching of the two sets of switch contacts 32, 33 and 32a, 33a is varied according to the seesaw direction of the control key 21 to achieve two- stage switching action in either direction, and miniaturization and cost reduction are achieved by reduction of the number of part items.

Description

Detailed Description of the Invention

[0001]

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

[0002]

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

The conventional two-stage seesaw switch will be described with reference to FIGS. 6 to 7C. According to the figure, the substrate 1
Bearing pieces 5, 5 are provided on the lower surfaces of both ends of an operation key 4 which is attached to a base 2 which is integrally provided with the operation key 4 so as to be swingable around a shaft 3.
a is attached to the bearing pieces 5 and 5a, and inverted T-shaped swing members 6 and 6a are swingably attached to the shafts 7 and 7a.

Further, bowl-shaped elastic bodies 8a to 8 bulged from the rubber plate 9 are formed on the lower surfaces of the left and right ends of the swing members 6 and 6a.
d are provided in contact with each other, and 8b and 8c are thin,
8a and 8d are thick.

Further, the central portion of all the bowl-shaped elastic bodies 8a to 8d is a thick disk portion 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 substrate facing below a to 12d.

Next, the operation will be described with reference to FIGS. 7A to 7C. When the right upper surface of the operation key 4 is pressed from the state of FIG. 7A, as shown in FIG. 7B. In addition, the operation key 4 rotates rightward about the shaft 3 to push down the shaft 7a, and the rocking member 6a is pushed down accordingly, pushing the bowl-shaped elastic bodies 8a and 8b downward. First, only the thin bowl-shaped elastic body 8b is depressed to be deformed, and the movable contact 12b
Goes down to short-circuit the fixed contact 13b.

Further, when the operation key 4 is strongly pressed, the thick film bowl-shaped elastic body 8a is also dented and deformed as shown in FIG. 7 (c), and the fixed contact 13 ₁ is short-circuited.

After that, when 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 restored.

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

[0010]

However, in the above-mentioned conventional two-stage changeover seesaw switch, the two rocking members 6, 6a and the four bowl-shaped elastic bodies 8a to 8d are components.
And four sets of switch contacts 12a, 1 provided on the lower surface thereof
Since a large number of components such as 2a to 12d and 13a to 13d are required, and the number of steps for assembling these components is also high, the cost is high and it is also disadvantageous in terms of downsizing the switch.

The present invention is intended to solve such a conventional problem, and an object thereof is to provide a two-stage seesaw switch which has a small number of constituent parts and which can be easily miniaturized.

[0012]

In order to solve the above problems, the present invention provides protrusions in place of two bearing pieces on the lower surface of the operation key of a seesaw switch, and replaces two rocking members with one protrusion. By providing a single vertically movable drive plate, the switching order of the two sets of switch contacts is changed depending on the seesaw direction of the operation key, and the two-stage switching operation is performed in each direction.

[0013]

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

[0014]

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

In FIG. 1, reference numeral 21 denotes a hollow operation key made of molding resin, which is pushed to the left and right symmetrical positions on the upper surface of the operation portion 2.
2 and 22a, and projections 23 and 23a are provided at two points equidistant from the center on the inner surface of the lower surface thereof, and are supported swingably by concentric support holes 24 and 24a on the central front and rear surfaces. .

Reference numeral 25 is a base made of molded resin, and concentric support shafts 26, 26a around the center of the upper surface fit into the support holes 24, 24a of the operation key 21 to support the operation key 21, and the support shaft 26. , 26a, a flat plate-shaped drive plate 27 is vertically movably positioned by two bosses 28, 28a, and the upper surface is in contact with lower ends of the left and right protrusions 23, 23a of the operation key 21. .

Further, on the lower surface of the drive plate 27, a substantially equal elastic force is formed by being bulged from the rubber plate 29 at a position outside the left and right protrusions 23, 23a of the operation key 21 and at an equal distance from the center. Two bowl-shaped elastic bodies 30, 30a having
The central disk portions 31 and 31a of the above contact.

Conductive movable contacts 32, 32a are fixed to the lower surfaces of the disk portions 31, 31a, and a pair of fixed contacts 33, 33a are respectively provided on the base body 25 facing the conductive movable contacts 32, 32a.
Are printed.

Next, the operation of the seesaw operation of the operation key 21 of the two-stage seesaw switch will be described.

First, in the neutral state shown in FIG. 1, the left and right bowl-shaped elastic bodies 30, 30a are elastically contacted with the left and right protrusions 23, 23a of the operation key 21 through the drive plate 27. The operation key 21 does not rattle, and the neutral state is reliably maintained.

Next, the right pressing operation portion 22a of the operation key 21
When is pressed, the operation key 21 rotates and swings around the support shafts 26 and 26a, and the protrusion 23a tends to push down the drive plate 27 as shown in FIG.

Here, as shown in FIG. 1, the operation keys 21
Left and right protrusions 23, 23a and left and right bowl-shaped elastic bodies 30, 3
The distance between the disk portions 31a and 31a of 0a is (between the projection 23 and the central disk portion 31) = (between the projection 23a and the central disk portion 31a) = B, and between the (between the projection 23 and the projection 23a). =
Letting C be W and the pressing force by the protrusion 23a be W, the force Fa applied to the disk portion 31 and the force Fb applied to the disk portion 32 via the drive plate 27 are expressed as follows.

[0023]

[Equation 1]

[0024]

[Equation 2]

As is clear from the above, a larger force is applied to the disc portion 31a, so that when the force exceeds the elastic force of the individual bowl-shaped elastic bodies 30 and 30a, the bowl-shaped elastic body 30a first has a concave shape. Then, the movable contact 32a descends, and the fixed contact 33a, which is the first contact, is short-circuited.

At this time, the drive plate 27 is tilted with the disc portion 31 as a fulcrum. After this, the right pressing operation unit 2 of the operation key 21 is further
When the force applied to 2a is increased, as shown in FIG. 4, the bowl-shaped elastic body 30a remains depressed, that is, the fixed contact 33a remains short-circuited and does not move, and the force applied to the disc portion 31 increases,
When the force exceeds the elastic force of the bowl-shaped elastic body 30, this time, the bowl-shaped elastic body 30 is depressed and deformed to move the movable contact 32, and the fixed contact 33 which is the second contact is short-circuited.

At this time, the drive plate 27 is inclined with the disc portion 31a as a fulcrum, and becomes horizontal at the position downward.

After that, the right pressing operation portion 22 of the operation key 21
When the pushing force applied to a is removed, the elastic force of the bowl-shaped elastic bodies 30 and 30a that are recessed in a concave shape to return to the original bowl shape causes the disk portions 31 and 31a to move to the drive plate 27.
By pushing up, the projection 23a of the operation key 21 is pushed, the operation key 21 returns to the original neutral state of FIG. 1, and the short-circuited fixed contacts 33a and 33 are returned to the original open state.

Similarly, when the left pressing operation portion 22 of the operation key 21 is pressed to swing the operation key 21, the bowl-shaped elastic body 30 is first dented and deformed, and the movable contact 33 serves as the first contact. Short-circuiting occurs, and then the bowl-shaped elastic body 30a is depressed so that the fixed contact 33a short-circuits as the second contact.

FIG. 5 is a conceptual diagram of a two-stage change seesaw switch system used for zoom adjustment of a video camera using the two-stage change seesaw switch of the present invention, and 34 is composed of a movable contact 32a and a fixed contact 33a. 1 is a first switch section, 35 is a second switch section composed of a movable contact 32 and a fixed contact 33, and 36 is a first switch section 34 and a second switch section 35 in FIG. It is the two-stage change seesaw switch described.

37 is this two-stage seesaw switch 36
When the switch is operated, it is detected which of the first switch unit 34 and the second switch unit 35 is turned on, and when the other switch unit which is not turned on is turned on, the on state is detected, It is a detection means that outputs each as an electric signal to the device body side (not shown).

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

That is, the two-stage seesaw switch 3 shown in FIG.
When the right pressing operation section 22a of 6 is pressed to turn on the first switch section 34, the detection means 37 detects this and outputs it as a first signal to a microcomputer (not shown) on the apparatus body side. At this time, when a further force is applied to the right pressing operation section 22a to turn on the second switch section 35, the detection means 37 detects and outputs it as a second signal to the microcomputer on the device body side. Upon receiving the above signal, the microcomputer on the main body side of the device first starts fine speed zooming to the telephoto side, and outputs a command to perform zooming at high speed by the next signal.

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

[0035]

EFFECTS OF THE INVENTION The two-stage changeover seesaw switch of the present invention (1) is low in material cost and assembly cost because it is composed of two switch parts and has a small number of constituent parts.

(2) The height and length of the seesaw switch as a whole can be greatly reduced, which is advantageous for downsizing. And so on.

[Brief description of drawings]

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

FIG. 2A is a sectional view of the same side, and FIG. 2B is a sectional view taken along line AA ′ of FIG.

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

FIG. 4 is a front sectional view of the operating 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 seesaw switch.

FIG. 7A to FIG. 7C are schematic diagrams for explaining the same operation state.

[Explanation of symbols]

 21 Operation Key 23 Protrusion 25 Base Body 26 Spindle 27 Drive Plate 32, 32a Moving Contact 33, 33a Fixed Contact 34 First Switch Section 35 Second Switch Section 37 Detecting Means

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[Procedure amendment]

[Submission date] April 13, 1993

[Procedure Amendment 1]

[Document name to be amended] Statement

[Name of item to be corrected] 0022

[Correction method] Change

[Correction content]

Here, as shown in FIG. 1, the operation keys 21
Left and right protrusions 23, 23a and left and right bowl-shaped elastic bodies 30, 3
The distance between the disk portions 31 and 31a of 0a is (between the protrusion 23 and the central disk portion 31) = (between the protrusion 23a and the central disk portion 31a) = B, and between the (between the protrusion 23 and the projection 23a). = C and the pressing force by the projection 23a is W, the force Fa applied to the disk portion 31 and the force Fb applied to the disk portion 31a via the drive plate 27 are expressed as follows.

[Procedure Amendment 2]

[Document name to be amended] Statement

[Name of item to be corrected] 0023

[Correction method] Change

[Correction content]

[0023]

[Equation 1]

[Procedure 3]

[Document name to be amended] Statement

[Name of item to be corrected] 0024

[Correction method] Change

[Correction content]

[0024]

[Equation 2]

Claims (2)

[Claims] 1. An operation key, which is swingably supported at a midpoint and has projections on the left and right from the center of the lower surface, and is arranged on the base outside the projections of the operation keys. Fixed contacts and two movable elastic contacts, which are arranged corresponding to the upper part of each fixed contact and elastically deform by pressing,
A two-stage seesaw switch comprising a drive plate which is held by a base body so as to be vertically movable, and whose upper surface is in contact with the lower end of the projection of the operation key and whose lower surface is in contact with the upper ends of the movable elastic contacts. 2. A first and a second switch section are formed by two fixed contacts and two movable contacts, and when either the first or the second switch section is turned on, It has a detection means for detecting whether the switch part of the switch is turned on and outputting it to the main body device side, and when the other switch part is turned on next, detecting the ON state of this switch and outputting it to the main body device side. A two-stage switch seesaw switch system using the two-stage switch seesaw switch according to claim 1.