阅读说明：本技术 带点按弹簧的片材、带点按弹簧的片材的制造方法、开关装置 (Sheet with click spring, method for manufacturing sheet with click spring, and switch device ) 是由 杉浦琢郎 伊藤尧之 佐藤贵之 石森五音 于 2018-04-24 设计创作，主要内容包括：带点按弹簧的片材具备：片材构件；点按弹簧,其设置在所述片材构件的一面；以及按压件构件,其设置在所述片材构件的另一面的与所述点按弹簧的顶部对置的位置,所述按压件构件中的与所述片材构件接触的接触面分别具有：熔接部,其是被熔接的部分,且沿着该接触面的外周缘部设置；以及非熔接部,其是未被熔接的部分,且设置在由所述熔接部包围的区域内。(The sheet with the click spring is provided with: a sheet member; a click spring provided on one surface of the sheet member; and a pressing member provided at a position of the other surface of the sheet member facing a top portion of the click spring, wherein contact surfaces of the pressing member that contact the sheet member each have: a welded portion which is a welded portion and is provided along an outer peripheral edge portion of the contact surface; and a non-welded portion that is a portion that is not welded and that is provided in a region surrounded by the welded portion.)

1. A sheet with a click spring is provided with:

a sheet member;

a click spring provided on one surface of the sheet member; and

a pressing member provided at a position of the other surface of the sheet member facing a top portion of the click spring,

the contact surfaces of the pressing members that contact the sheet member each have:

a welded portion which is a welded portion and is provided along an outer peripheral edge portion of the contact surface; and

and a non-welded portion which is a portion that is not welded and is provided in a region surrounded by the welded portion.

2. The spring-loaded sheet material according to claim 1,

in the contact surface, the welded portion is formed along an outer peripheral edge portion of the contact surface over an entire periphery.

3. The sheet material with a click spring according to claim 1 or 2,

in the contact surface, the weld is formed at an outer peripheral edge portion of the contact surface.

4. The spring-loaded sheet material according to any one of claims 1 to 3,

the contact surface has no welded portion in a region surrounded by the welded portion.

5. The spring-loaded sheet material according to any one of claims 1 to 4,

the contact surface has a circular shape.

6. The spring-loaded sheet material according to any one of claims 1 to 5,

a plurality of sets of the click springs and the presser member are provided on one sheet member,

in each of a plurality of the groups,

the contact surfaces of the pressing members that contact the sheet member each have:

a welded portion which is a welded portion and is provided along an outer peripheral edge portion of the contact surface; and

and a non-welded portion which is a portion that is not welded and is provided in a region surrounded by the welded portion.

7. The spring-loaded sheet material according to any one of claims 1 to 6,

the welding is laser welding.

8. A method for manufacturing a sheet with a click spring,

the sheet with the click spring includes:

a sheet member;

a click spring provided on one surface of the sheet member; and

a pressing member provided at a position of the other surface of the sheet member facing a top portion of the click spring,

the method for manufacturing the spring with point press sheet is characterized by comprising a welding process of welding the pressing member to the sheet member in the following mode:

a welded portion and a non-welded portion are formed on a contact surface of the pressing member, the contact surface being in contact with the sheet member, the welded portion being a welded portion and being provided along an outer peripheral edge portion of the contact surface, and the non-welded portion being a non-welded portion and being provided in a region surrounded by the welded portion.

9. A switch device is characterized by comprising:

the sheet with a click spring of any one of claims 1 to 7; and

and a base material bonded to the one surface of the sheet with the click spring, the base material having a first fixed contact and a second fixed contact on a surface facing the click spring, the click spring being pressed and deformed so that the click spring comes into contact with both the first fixed contact and the second fixed contact, whereby the first fixed contact and the second fixed contact are electrically connected to each other.

Technical Field

The present invention relates to a sheet with a click spring, a method for manufacturing the sheet with the click spring, and a switch device.

Background

Conventionally, as a switch device used for various electronic apparatuses and the like, a switch device using a sheet with a click spring is known. In the switch device using the sheet with the click spring, the click spring attached to the back surface of the film-like sheet member can give a user a click operation feeling when performing a switch operation. Among such switch devices using a sheet with a click spring, there is a switch device in which a pressing member is provided on a surface of a sheet member.

For example, patent document 1 below discloses a technique of providing a pressing force transmission member (pressing member) for transmitting a pressing force toward a click spring on a surface of a sheet member in a switch device using a sheet with the click spring, and irradiating a portion where the sheet member and the pressing force transmission member overlap each other with laser light or ultrasonic waves to weld the overlapping portion, thereby fixing the sheet member and the pressing force transmission member.

Disclosure of Invention

Problems to be solved by the invention

However, in the conventional switch device using the sheet with the click spring including the pressing member, when the pressing member is pressed obliquely with respect to the center of the click spring, the click spring is pressed by the outer peripheral edge portion of the pressing member, and therefore the click spring is pressed at a position away from the center, and the operating force of the switch operation varies. Therefore, as a method for suppressing the occurrence of such a phenomenon, a method of changing the shape of the pusher member or the like is considered, but in this case, the manufacturing cost of the switch device may increase. In view of the above, in a switch device using a sheet with a click spring provided with a pressing member, it is desired to suppress variation in operating force of a switch operation without increasing manufacturing cost.

Means for solving the problems

The sheet with the click spring according to one embodiment includes: a sheet member; a click spring provided on one surface of the sheet member; and a pressing member provided at a position of the other surface of the sheet member facing a top portion of the click spring, wherein contact surfaces of the pressing member that contact the sheet member each have: a welded portion which is a welded portion and is provided along an outer peripheral edge portion of the contact surface; and a non-welded portion that is a portion that is not welded and that is provided in a region surrounded by the welded portion.

Effects of the invention

According to one embodiment, in a switch device using a sheet with a click spring provided with a pressing member, variation in operating force of a switch operation can be suppressed without increasing manufacturing cost.

Drawings

Fig. 1 is a plan view showing a sheet with a click spring according to an embodiment.

Fig. 2 is a cross-sectional view a-a of the sheet with the click spring shown in fig. 1.

Fig. 3 is a cross-sectional view showing a switch device including a sheet with a click spring according to an embodiment.

Fig. 4A is a partially enlarged cross-sectional view of a joint portion of the pressing member and the sheet member in the sheet with the click spring according to the embodiment.

Fig. 4B is a partially enlarged rear view of a joint portion of the pressing member and the sheet member in the sheet with the click spring according to the embodiment.

Fig. 5 is a flowchart illustrating steps of a method of manufacturing a sheet with a click spring according to an embodiment.

Fig. 6 is a cross-sectional view showing a conventional switchgear.

Fig. 7 is a partially enlarged cross-sectional view of a joint portion between a pressing member and a sheet member in a sheet with a click spring having a conventional structure.

Fig. 8A is a diagram illustrating an operation of the switching device according to the embodiment.

Fig. 8B is a diagram illustrating an operation of the switching device according to the embodiment.

Fig. 9A is a diagram illustrating an operation of a conventional switchgear.

Fig. 9B is a diagram illustrating an operation of a conventional switchgear.

Fig. 10 is a graph showing the measurement results of the operating forces of the switchgear of the embodiment and the switchgear of the conventional configuration.

Fig. 11 is a cross-sectional view showing a modification of the opening and closing device including the sheet with the click spring according to the embodiment.

Detailed Description

Hereinafter, an embodiment will be described with reference to the drawings.

(Structure of sheet with click spring 100)

Fig. 1 is a plan view illustrating a sheet 100 with a click spring according to an embodiment. Fig. 2 is a cross-sectional view a-a of the spring loaded sheet 100 shown in fig. 1. The sheet 100 with a click spring shown in fig. 1 and 2 is bonded to a circuit board 120 (see fig. 3) to constitute the switch device 10 (see fig. 3) together with the circuit board 120, and functions as an operation portion of the switch device 10.

As shown in fig. 1 and 2, the sheet material 100 with the click spring includes a sheet member 102, a click spring 104, a pressing member 106, and a spacer 108.

The sheet member 102 is a transparent and thin film-like member. The sheet member 102 is flexible. The sheet member 102 is made of a resin material such as pet (polyethylene terephthalate). In the example shown in fig. 1, the sheet member 102 has a rectangular shape with its corners chamfered as seen in a plan view, but the shape of the sheet member 102 is not limited to this.

The click spring 104 is a thin plate-like member provided on the back surface 102B (surface on the negative side of the Z axis in the figure, an example of the "other surface" in the claims) of the sheet member 102 and at the center of the sheet member 102. The click spring 104 is adhered to the back surface 102B of the sheet member 102 by an adhesive. The click spring 104 is curved convexly toward the front surface side (the positive side of the Z axis in the figure), so-called dome-shaped. The click spring 104 has elasticity, and deforms into a concave shape when a pressing force is applied from the front surface side, and returns to an original convex shape due to a repulsive force when the pressing force is released. The click spring 104 is made of, for example, a metal material having conductivity. In the example shown in fig. 1, the click spring 104 has an elliptical shape as a shape in a plan view, but the shape of the click spring 104 is not limited to this.

The pressing member 106 is a convex member provided on the front surface 102A (the surface on the Z-axis positive side in the figure, an example of the "one surface" in the claims) of the sheet member 102 and at the center of the sheet member 102 (a position facing the top of the click spring 104 provided on the back surface 102B of the sheet member 102). The pressing member 106 is welded to the surface 102A of the sheet member 102 by laser welding. In the example shown in fig. 1, the pusher member 106 and the sheet member 102 are welded by laser welding, but the present invention is not limited to laser welding, and ultrasonic welding, heat pressing, or the like may be used. However, the position of the welded portion can be easily adjusted by using laser welding, and laser welding is more preferably used from this viewpoint. The presser member 106 is made of a resin material such as PET. In the example shown in fig. 1, the pressing member 106 has a circular shape as a shape in a plan view, but the shape of the pressing member 106 is not limited thereto.

The spacer 108 is a thin film-like member provided on the back surface 102B of the sheet member 102 so as to surround the periphery of the click spring 104. The spacer 108 is flexible. The spacer 108 is adhered to the back surface 102B of the sheet member 102 with an adhesive. The spacer 108 is made of a resin material such as PET. The spacer 108 is used to keep the space 100A, which is a movable region of the click spring 104, by raising the sheet member 102 when the sheet 100 with the click spring is bonded to the substrate.

(Structure of switch device 10)

Fig. 3 is a cross-sectional view showing the switch device 10 including the sheet 100 with the click spring according to the embodiment. The switching device 10 shown in fig. 3 is a device for various electronic apparatuses (e.g., a smartphone, a tablet terminal, etc.). As shown in fig. 3, the switch device 10 includes the sheet 100 with the click spring shown in fig. 1 and 2, and a circuit board 120.

The circuit board 120 includes a base 122, a first fixed contact 124, and a second fixed contact 126. The base material 122 is a plate-like member. The base material 122 is made of, for example, a material such as a phenol resin, an epoxy resin, or a glass substrate. The first fixed contact 124 and the second fixed contact 126 are film-like members formed on the surface of the base 122 (the surface facing the spring-loaded sheet 100, the surface on the Z-axis positive side in the drawing). The first fixed contact 124 and the second fixed contact 126 are made of, for example, a conductive metal material.

As shown in fig. 3, the sheet 100 with the click spring and the circuit board 120 are laminated to each other to form a laminated structure, thereby forming the switch device 10. Specifically, the click spring-attached sheet 100 is adhered to the surface of the circuit board 120 (base 122) by an adhesive at the bottom surface portion of the spacer 108. At this time, the edge of the click spring 104 is always in contact with the second fixed contact 126. The center position of the click spring 104 is aligned with the center position of the first fixed contact 124.

In the switch device 10 configured as described above, when the pressing member 106 is pressed and the pressing force is applied to the click spring 104, the click spring 104 is deformed into a concave shape, and the center portion of the click spring 104 comes into contact with the first fixed contact 124. Thereby, the first fixed contact 124 and the second fixed contact 126 are brought into a conductive state via the click spring 104.

At this time, in the switch device 10, the pressing force can be reliably transmitted to the click spring 104 by the pressing member 106, and a good click operation feeling can be obtained by the click spring 104. In particular, since the pressing member 106 is laser-welded to the sheet member 102, the joining strength between the pressing member 106 and the sheet member 102 is high, and the falling-off due to peeling or the like can be suppressed.

On the other hand, in the switch device 10, when the pressing member 106 is not pressed and the click spring 104 is released from the pressing force, the click spring 104 returns to the original convex shape, and the contact of the center portion of the click spring 104 with the first fixed contact 124 is brought into contact. Thereby, the first fixed contact 124 and the second fixed contact 126 are in a non-conductive state.

(Structure of the joining portion of the presser member 106 and the sheet member 102)

Fig. 4 is a partially enlarged view of a joint portion of the pressing member 106 and the sheet member 102 in the sheet 100 with the click spring according to the embodiment. Fig. 4A is a partially enlarged sectional view of a joint portion of the pressing member 106 and the sheet member 102. Fig. 4B is a partially enlarged rear view of the joint of the pressing member 106 and the sheet member 102.

As shown in fig. 4, the contact surface 106A of the pressing member 106 that contacts the sheet member 102 has a circular shape, and is configured to have a welded portion 106A-1 and a non-welded portion 106A-2. The welded portion 106A-1 is a portion that is laser welded to the sheet member 102. The non-welded portion 106A-2 is a portion that is not laser-welded to the sheet member 102.

In the contact surface 106A, the fusion-spliced portion 106A-1 is a portion provided along the outer peripheral edge of the contact surface 106A. On the other hand, the non-welded portion 106A-2 is a portion provided in the region surrounded by the welded portion 106A-1.

In the example shown in fig. 4, the welded portion 106A-1 is formed along the outer peripheral edge of the contact surface 106A over the entire periphery, and is formed at the outer peripheral edge of the contact surface 106A. In the example shown in fig. 4, in the contact surface 106A, the entire region surrounded by the welded portion 106A-1 is the non-welded portion 106A-2, that is, the region surrounded by the welded portion 106A-1 does not have a portion welded by the laser.

On the back surface 102B of the sheet member 102, an annular recessed portion 102B-1 is formed along the welded portion 106A-1 due to heat shrinkage at the time of laser welding of the welded portion 106A-1. Thus, the convex portion 102B-2 having a truncated cone shape is formed on the back surface 102B of the sheet member 102 in the region surrounded by the concave portion 102B-1. That is, the outer peripheral edge of the substantially circular surface on the Z-direction negative side of the convex portion 102B-2 is located closer to the center of the click spring 104 than the outer peripheral edge of the pusher member 106.

For reference, an example of the dimensions of the pressing member 106 and the recessed portion 102B-1 is as follows.

Diameter of the presser member 106: 1.5mm

Thickness of the presser member 106: 188 μm

Diameter of center line of recess 102B-1: 1.28mm

Depth of recess 102B-1: 10 μm

(method of manufacturing sheet with click spring 100)

Fig. 5 is a flowchart illustrating steps of a method of manufacturing the sheet with click spring 100 according to an embodiment.

First, the pressing member 106 is disposed on the front surface 102A of the sheet member 102 and at the center of the sheet member 102, and the joining portion between the pressing member 106 and the sheet member 102 is irradiated with laser light from the sheet member 102 side, whereby the pressing member 106 is laser-welded to the sheet member 102 (step S501: welding step). Here, the sheet member 102 is laser welded over the entire circumference along the outer peripheral edge of the contact surface 106A of the pressing member 106. Thus, as shown in fig. 4, an annular recessed portion 102B-1 is formed on the back surface 102B of the sheet member 102, and a convex portion 102B-2 having a truncated cone shape is formed in a region surrounded by the recessed portion 102B-1.

(step S502: first pasting Process)

Next, the click spring 104 is attached to the back surface 102B of the sheet member 102 with an adhesive or the like (for example, an adhesive layer formed over the entire surface of the back surface 102B). At this time, the center of the click spring 104 is made to coincide with the center of the sheet member 102. That is, the center (top) of the click spring 104 is aligned with the center of the pusher member 106.

(step S503: second pasting step)

Next, the spacer 108 is attached to the back surface 102B of the sheet member 102 with an adhesive or the like (e.g., an adhesive layer formed over the entire back surface 102B). Here, the shape of the outer peripheral edge of the spacer 108 is the same as the shape of the outer peripheral edge of the sheet member 102 (rectangular shape with chamfered corners). Therefore, in this step, the outer peripheral edge of the spacer 108 and the outer peripheral edge of the sheet member 102 are bonded to each other so as to match each other.

Through the above steps S501 to S503, the sheet 100 with the click spring shown in fig. 1 to 4 is manufactured.

The order of execution of the steps is not limited to the above order. For example, the spacer 108 may be attached before the pressing member 106 is laser-welded, or may be attached before the spring 104 is pressed at an attachment point.