KR20060067169A - Capacitance switch module having light emitting device - Google Patents

Abstract

 The present invention relates to a capacitive switch module that removes a sensitivity deviation that may occur when attaching the capacitive switch module to an outer cover, and emits light at a portion where the capacitive switch is touched. A lower case having a tubular shape in which a protruding mounting jaw is formed; It includes a capacitive sensor chip that detects the change in capacitance according to the contact of the human body, a peripheral circuit part, and an external connection terminal, and is horizontally spread over the protruding mounting jaw. A printed circuit board installed; A conductive elastic body installed on the sensing pad; A diffused lens formed in a box shape having an open bottom surface, and having a sidewall mounted on the conductive elastic body to protrude out of the case; And a molding compound filling a lower portion of the protruding mounting jaw of the case so that the external connection terminal penetrates downward, and has at least one of an outer surface and an inner surface of the diffusion lens and a bottom surface of the sidewall of the diffusion lens. A coating film is formed, and a mirror coating film is formed on at least one of an inner surface of the side wall on the protruding mounting jaw of the case and an outer surface of the side wall of the diffusion lens.

Capacitive switch, conductive elastomer, light emitting device, mirror coating, sensing pad,

Description

Capacitive switch module having light emitting device             

1A to 1D are views for explaining a capacitive switch module according to a first embodiment of the present invention;

2 is a view for explaining a capacitive switch module according to a second embodiment of the present invention;

3 is a view for explaining a capacitive switch module according to a third embodiment of the present invention;

4 is a view for explaining a capacitive switch module according to a fourth embodiment of the present invention;

5 is a view for explaining a capacitive switch module according to a fifth embodiment of the present invention;

6 is a view for explaining a capacitive switch module according to a sixth embodiment of the present invention;

7 is a view for explaining a capacitive switch module according to a seventh embodiment of the present invention;

8 is a diagram for describing a capacitive switch module according to an eighth embodiment of the present invention.

 <Description of Reference Numbers for Main Parts of Drawings>

10: printed circuit board 12: sensing pad

14: light emitting element 16: substrate insulating film

17: Peripheral component 18: External connection terminal

19: capacitive sensor chip 20, 220: conductive elastomer

30: case

34, 44, 34 ', 44', 134, 144, 135: mirror coating film

32: protruding mounting jaw 40, 40 ': diffused lens

50: molding compound 45: transparent conductive coating film

140 and 140 ': light diffusion molding body 142: light diffusion film

150: transparent conductive elastomer 210: light guide plate

The present invention relates to a capacitive switch module, and more particularly to a capacitive switch module that can be individually attached to an outer cover in a state that includes a light emitting device.

When attaching the capacitive switch module to the outer cover, the gap between the capacitive switch and the outer cover is caused by the bending of the outer cover or by the rod deviation caused by the production of the outer cover and the capacitive switch module, thereby causing errors in sensing. . To prevent this, an elastic conductor is installed on the module sensing surface side to give elasticity to the sensing surface of the capacitive switch attached to the outer cover. However, since the elastic conductor has no light permeability, a problem may arise because the function of the light emitting device is not properly exhibited in this case.

Accordingly, the technical problem to be achieved by the present invention is to remove the sensitivity deviation that may occur when attaching the capacitive switch module to the outer cover, and the switch operation state can be easily known by emitting light from the touched portion The present invention provides a capacitive switch module that can solve the above-described problems.

Capacitive switch module according to an embodiment of the present invention for achieving the above technical problem, the top and bottom is open, the lower case of the inner surface of the side wall of the tubular form protruding mounting jaw is formed; It includes a capacitive sensor chip that detects the change in capacitance due to human contact, a peripheral circuit part, and an external connection terminal, and is horizontally spread over the protruding mounting jaw, and a sensing pad is installed at an edge of the upper surface thereof, and a light emitting element is disposed at the center thereof. A printed circuit board installed; A conductive elastic body installed on the sensing pad; A diffused lens formed in a box shape having an open bottom surface, and having a sidewall mounted on the conductive elastic body to protrude out of the case; And a molding compound filling a lower portion of the protruding mounting jaw of the case so that the external connection terminal penetrates downward, and has at least one of an outer surface and an inner surface of the diffusion lens and a bottom surface of the sidewall of the diffusion lens. A coating film is formed, and a mirror coating film is formed on at least one of an inner surface of the side wall on the protruding mounting jaw of the case and an outer surface of the side wall of the diffusion lens.

Capacitive switch module according to another embodiment of the present invention for achieving the above technical problem, the upper and lower openings, the case of the tubular form is formed in the lower portion of the inner surface of the side wall protrusion protrusion; It includes a capacitive sensor chip that detects the change in capacitance according to the contact of the human body, a peripheral circuit part, and an external connection terminal, and is horizontally spread over the protruding mounting jaw. A printed circuit board installed; A diffusion lens of an elastic material having a box shape having an open bottom surface and having a side wall mounted on the sensing pad to protrude out of the case; And a molding compound filling a lower portion of the protruding mounting jaw of the case so that the external connection terminal penetrates downward, and has at least one of an outer surface and an inner surface of the diffusion lens and a bottom surface of the sidewall of the diffusion lens. A coating film is formed, and a mirror coating film is formed on at least one of an inner surface of the side wall on the protruding mounting jaw of the case and an outer surface of the side wall of the diffusion lens.

Capacitive switch module according to another embodiment of the present invention for achieving the above technical problem, the top and bottom is open, the case of the tubular shape is formed in the lower portion of the inner surface of the side wall protruding mounting jaw; It includes a capacitive sensor chip that detects the change in capacitance according to the contact of the human body, a peripheral circuit part, and an external connection terminal, and is horizontally spread over the protruding mounting jaw. A printed circuit board installed; A conductive elastic body installed on the sensing pad; A diffused lens having a box shape with an open bottom surface, and having a sidewall mounted on the conductive elastic body to protrude out of the case; And a molding compound filling a lower portion of the protruding mounting jaw of the case so that the external connection terminal penetrates downward, and includes at least one of an inner surface of the side wall on the protruding mounting jaw of the case and an outer surface of the side wall of the diffusion lens. The surface is mirror-coated with a conductive material.

Capacitive switch module according to another embodiment of the present invention for achieving the above technical problem, the top and bottom is open, the case of the tubular shape is formed in the lower portion of the inner surface of the side wall protruding mounting jaw; It includes a capacitive sensor chip that detects the change in capacitance according to the contact of the human body, a peripheral circuit part, and an external connection terminal, and is horizontally spread over the protruding mounting jaw. A printed circuit board installed; A conductive elastic body installed on the sensing pad; A diffusion lens having a bottom surface open in a box shape, and having sidewalls mounted on the conductive elastic body to protrude out of the case; And a molding compound filling a lower portion of the protruding mounting jaw of the case so that the external connection terminal penetrates downward. A mirror coating film is formed on an outer surface of the sidewall of the diffusion lens and a transparent conductive coating film on an outer surface or an inner surface of the upper surface. A transparent conductive sheet is provided, wherein a groove is formed vertically on the outer surface or the inner surface of the sidewall of the diffusion lens, and the conductive elastic body is filled in the groove.

Capacitive switch module according to another embodiment of the present invention for achieving the above technical problem, the top and bottom is open, the case of the tubular shape is formed in the lower portion of the inner surface of the side wall protruding mounting jaw; It includes a capacitive sensor chip that detects the change in capacitance according to the contact of the human body, a peripheral circuit part, and an external connection terminal, and is horizontally spread over the protruding mounting jaw. A printed circuit board installed; A conductive light diffusion molding member made of an elastic material filling the upper portion of the protruding mounting jaw to protrude out of the case; And a molding compound filling a lower portion of the protruding mounting jaw of the case so that the external connection terminal penetrates downward. It is characterized in that a mirror coating film is formed on one surface.

Capacitive switch module according to another embodiment of the present invention for achieving the above technical problem, the top and bottom is open, the case of the tubular shape is formed in the lower portion of the inner surface of the side wall protruding mounting jaw; It includes a capacitive sensor chip, a peripheral circuit part, and an external connection terminal for horizontally detecting the capacitance change according to the contact of the human body, and is horizontally spread over the protruding mounting jaw. Printed circuit board is installed; A conductive light diffusion molding member filling the upper portion of the protruding mounting jaw; A transparent conductive elastic body installed on the light diffusion molding body and protruding out of the case; And a molding compound filling a lower portion of the protruding mounting jaw of the case so that the external connection terminal penetrates downward. It is characterized in that a mirror coating film is formed on one surface.

Capacitive switch module according to another embodiment of the present invention for achieving the above technical problem, the top and bottom is open, the case of the tubular shape is formed in the lower portion of the inner surface of the side wall protruding mounting jaw; A printed circuit board including a capacitive sensor chip detecting a change in capacitance due to contact of a human body, a peripheral circuit part, and an external connection terminal, which is horizontally spread over the protruding mounting jaw, and a sensing pad is installed at an edge of an upper surface of the printed circuit board; A conductive elastic body filled in a predetermined thickness so as not to exceed the case on the protruding mounting jaw; It is installed to protrude out of the case on the conductive elastic body, a reflective thin film is installed on the bottom surface of the light guide plate and a light emitting device electrically connected to the circuit portion of the printed circuit board is coupled to the side, and the light emitted from the light emitting device is A light module in which mirror coating is made to proceed only toward the light guide plate; And a molding compound filling a lower portion of the protruding mounting jaw of the case so that the external connection terminal penetrates downward.

Hereinafter, with reference to the accompanying drawings, preferred embodiments of the present invention will be described in detail. The following embodiments are only presented to understand the content of the present invention, and those skilled in the art may make many modifications within the technical spirit of the present invention. Therefore, the scope of the present invention should not be interpreted as being limited to these embodiments.

Example 1

1A to 1D are diagrams for describing a capacitive switch module according to a first embodiment of the present invention.

FIG. 1B is a simplified exploded perspective view of the capacitive switch module, and FIG. 1C is a sectional view at the time of coupling. 1B and 1C, the case 30 has a cylindrical shape in which the top and the bottom thereof are open, and a protruding mounting jaw 32 is formed at the lower portion of the inner surface of the side wall. As shown in FIG. 1A, the printed circuit board 10 includes a capacitive sensor chip 19, a peripheral component 17, and an external connection terminal 18 for detecting a change in capacitance. On one side, a sensing pad 12, a substrate insulating layer 16, and a light emitting element 14 that detect contact of a human body are installed. The light emitting element 14 is installed at the center and the sensing pad 12 is installed at the edge. The substrate insulating film 16 is formed at a portion where the sensing pad 12 and the light emitting element 14 are not provided, and is formed of an insulating film of white or the like having good light reflectance.

The printed circuit board 10 is installed to horizontally span the protruding mounting jaw 32 so that the surface with the sensing pad 12 faces upward. The conductive elastic body 20 is installed on the sensing pad 12, and the sidewall of the diffusion lens 40 is placed on the conductive elastic body 20. The diffusion lens 40 is made of a transparent or translucent material, and has a box shape having an open bottom surface, and when the diffusion lens 40 is placed on the conductive elastic body 20, the diffusion lens 40 protrudes slightly out of the case 30. When the diffusion lens 40 is attached to the outer case (not shown) by the elastic force of the conductive elastic body 20, no gap is generated between them.

The lower portion of the protruding mounting jaw 32 of the case 30 is filled with the molding compound 50, and the external connection terminal 18 penetrates the molding compound 50 and exits to the outside. Molding compound 50 serves as a waterproof and other antifouling.

The light emitted from the light emitting element 14 is reflected in the diffusion lens 40 and escapes to the outside to improve the light emitting efficiency, so that the inner surface of the side wall on the protruding mounting jaw 32 of the case 30 and the side wall of the diffusion lens 40 are improved. Mirror coating films 34 and 44 are formed on the outer surface. Although the mirror coating layer 34 may be formed only on the inner surface of the case 30, since the diffusion lens 40 slightly protrudes out of the case 30, the diffusion lens 40 may be prevented from leaking to the side from the protruding side. It is preferable to form the mirror coating film 44 on the outer surface of the sidewalls of. Due to the mirror coating layers 34 and 44, most of the light emitted from the light emitting device 14 is emitted to the sensing surface, so that very high light efficiency can be obtained, so that bright light can be obtained even using a small light emitting device.

In order to improve sensing sensitivity, the transparent conductive coating layer 45 is formed on the inner surface and the bottom surface of the diffusion lens 40. Then, the transparent conductive coating film 45 is electrically connected to the sensing pad 12, so that the finger is in contact with the sensing surface (upper surface of the diffusion lens) to be surely transmitted to the sensing pad 12.

As shown in FIG. 1D, when a plurality of light emitting devices 14 are installed to emit different colors, each of the light emitting devices 14 can emit different colors according to a sensing state, a non-sensing state, or a different external state. You can check it.

In case of using a large number of capacitive switch modules in close proximity or induction heating equipment, unwanted electromagnetic waves are induced from neighboring switches or neighboring high frequency circuits, which may cause malfunction. Therefore, it is preferable that the side and bottom surfaces of the case 30 are coated with a conductive material and connected to the ground of the printed circuit board 10 to impart an electrostatic shielding function.

Example 2

2 is a view for explaining a capacitive switch module according to a second embodiment of the present invention. The difference from FIG. 1C is that the transparent conductive coating film 45 is formed on the outer surface and the bottom surface of the diffusion lens 40. Of course, it may be formed on the outer surface.

Example 3

3 is a view for explaining a capacitive switch module according to a third embodiment of the present invention. The difference from FIG. 1C is that the conductive elastic body 20 is not present on the sensing pad 12, and the diffusion lens 40 'is made of an elastic material such as silicon. When the sensing surface is pressed, the elastic force is applied by the diffusion lens 40 'of the elastic material, so there is no need for the conductive elastic body (20 in FIG. 1C).

Example 4

4 is a view for explaining a capacitive switch module according to a fourth embodiment of the present invention. The difference from FIG. 1C is that the transparent conductive coating film 45 is absent, and the mirror coating films 34 'and 44' are formed on the inner surface of the side wall on the protruding mounting jaw 32 of the case 30 and the outer surface of the side wall of the diffusion lens 40. It has this conductivity. Since the mirror coating films 34 'and 44' have conductivity, it is not necessary to form the transparent conductive coating film 45 to improve the sensing sensitivity.

Example 5

5 is a diagram for describing a capacitive switch module according to a fifth embodiment of the present invention. The difference from FIG. 1C is that the transparent conductive coating film 45 is installed on the outer surface or the inner surface of the upper surface of the diffusion lens 40. The use of a transparent conductive sheet instead of the transparent conductive coating film 45 will be more advantageous in terms of installation. In addition, the groove 22 is vertically formed on the outer surface of the side wall of the diffusion lens 40, and a different conductive elastic body is inserted into the groove 22 so that the conductive elastic body 20 and the transparent conductive coating film 45 are formed. This is electrically connected. When the transparent conductive coating film 45 is installed on the inner surface of the upper surface of the diffusion lens 40, the groove 22 should be formed on the inner surface of the side wall.

Example 6

6 is a view for explaining a capacitive switch module according to a sixth embodiment of the present invention. The difference from FIG. 1C is that instead of the diffusion lens 40, an electrically conductive light diffusion molding body 140 of elastic material is used. Since the light diffusion molding body 140 is made of an elastic material, a conductive elastic body (20 in FIG. 1C) is not necessary. Since the light diffusion molding body 140 is made of a conductive material, a transparent conductive coating film (45 in FIG. 1C) is not required. In order to improve the light efficiency, the mirror coating films 144 and 134 are formed on the inner surface of the side wall on the protruding mounting jaw 32 of the case 30 and on the side of the light diffusion molding body 140, as in the case of FIG. 1C. It is more preferable if the light diffusion film 142 is interposed in the light diffusion molding body 140 horizontally.

Example 7

7 is a view for explaining a capacitive switch module according to a seventh embodiment of the present invention. The difference from FIG. 6 is that the light diffusion molding body 140 'does not have elasticity. In this case, it is preferable to further install the transparent conductive elastic body 150 on the light diffusion molding body 140 ′ for elastic attachment with the outer case and to protrude it out of the case 30.

Example 8

8 is a diagram for describing a capacitive switch module according to an eighth embodiment of the present invention. The eighth embodiment is that the light emitting element 14 is not present in the printed circuit board 30 but is installed in a separate light module. The light module is provided with a reflective thin film 212 on the bottom of the light guide plate (LGP, 210) placed horizontally, the circuit portion of the printed circuit board 10 through the connecting line 14a at the side end of the light guide plate 210. The light emitting device 14 is electrically connected to the light emitting device 14, and includes a mirror coating film 135 coated so that light emitted from the light emitting device 14 may travel only toward the light guide plate 210. It is more preferable to form the mirror coating film 34 on the inner surface of the side wall on the protruding mounting jaw 32 of the case 30.

The conductive elastic body 220 is filled to a predetermined thickness on the protruding mounting jaw 32 of the case 30, and the light module is placed thereon. Since the conductive elastic body 220 has elasticity, it is not necessary to install a separate conductive elastic body on the sensing pad 12, and the light module may be installed to protrude slightly out of the case 30.

According to the present invention as described above, since the elastic force is applied to the sensing surface, it is possible to prevent the gap between them when the switch module and the outer case are attached. In addition, since the light is emitted from the sensing surface, the switch operation state can be easily known.

Claims (12)

A case having a tubular shape in which a top and a bottom are opened and a protruding mounting jaw is formed at an inner side of the side wall; It includes a capacitive sensor chip that detects the change in capacitance according to the contact of the human body, a peripheral circuit part, and an external connection terminal, and is horizontally spread over the protruding mounting jaw. A printed circuit board installed; A conductive elastic body installed on the sensing pad; A diffused lens formed in a box shape having an open bottom surface, and having a sidewall mounted on the conductive elastic body to protrude out of the case; And And a molding compound filling a lower portion of the protruding mounting jaw of the case so that the external connection terminal penetrates downward. A transparent conductive coating film is formed on at least one of an outer surface and an inner surface of the diffusion lens and a bottom surface of the diffusion lens sidewall, and at least one of an inner surface of the sidewall on the protruding mounting jaw of the case and an outer surface of the sidewall of the diffusion lens. Capacitive switch module characterized in that the mirror coating film is formed on the surface. A case having a tubular shape in which a top and a bottom are opened and a protruding mounting jaw is formed at an inner side of the side wall; It includes a capacitive sensor chip that detects the change in capacitance according to the contact of the human body, a peripheral circuit part, and an external connection terminal, and is horizontally spread over the protruding mounting jaw. A printed circuit board installed; A diffusion lens of an elastic material having a box shape having an open bottom surface and having a side wall mounted on the sensing pad to protrude out of the case; And And a molding compound filling a lower portion of the protruding mounting jaw of the case so that the external connection terminal penetrates downward. A transparent conductive coating film is formed on at least one of an outer surface and an inner surface of the diffusion lens and a bottom surface of the diffusion lens sidewall, and at least one of an inner surface of the sidewall on the protruding mounting jaw of the case and an outer surface of the sidewall of the diffusion lens. Capacitive switch module characterized in that the mirror coating film is formed on the surface. The capacitive switch module according to claim 2, wherein the diffusion lens is made of silicon. A case having a tubular shape in which a top and a bottom are opened and a protruding mounting jaw is formed at an inner side of the side wall; It includes a capacitive sensor chip that detects the change in capacitance according to the contact of the human body, a peripheral circuit part, and an external connection terminal, and is horizontally spread over the protruding mounting jaw. A printed circuit board installed; A conductive elastic body installed on the sensing pad; A diffused lens having an open bottom surface and having a side wall mounted on the conductive elastic body to protrude out of the case; And And a molding compound filling a lower portion of the protruding mounting jaw of the case so that the external connection terminal penetrates downward. And at least one of an inner surface of the side wall on the protruding mounting jaw of the case and an outer surface of the side wall of the diffusion lens is mirror-coated with a conductive material. A case having a tubular shape in which a top and a bottom are opened and a protruding mounting jaw is formed at an inner side of the side wall; It includes a capacitive sensor chip that detects the change in capacitance according to the contact of the human body, a peripheral circuit part, and an external connection terminal, and is horizontally spread over the protruding mounting jaw. A printed circuit board installed; A conductive elastic body installed on the sensing pad; A diffusion lens having a bottom surface open in a box shape, and having sidewalls mounted on the conductive elastic body to protrude out of the case; And And a molding compound filling a lower portion of the protruding mounting jaw of the case so that the external connection terminal penetrates downward. A mirror coating film is formed on the outer surface of the sidewall of the diffusion lens, and a transparent conductive coating film or a transparent conductive sheet is formed on the outer surface or the inner surface of the diffusion lens, and a groove is formed vertically on the outer surface or the inner surface of the sidewall of the diffusion lens. Capacitive switch module, characterized in that the conductive elastomer is filled. A case having a tubular shape in which a top and a bottom are opened and a protruding mounting jaw is formed at an inner side of the side wall; It includes a capacitive sensor chip that detects the change in capacitance according to the contact of the human body, a peripheral circuit part, and an external connection terminal, and is horizontally spread over the protruding mounting jaw. A printed circuit board installed; A conductive light diffusion molding member made of an elastic material filling the upper portion of the protruding mounting jaw to protrude out of the case; And And a molding compound filling a lower portion of the protruding mounting jaw of the case so that the external connection terminal penetrates downward. And a mirror coating film is formed on at least one of an inner surface of the side wall on the protruding mounting jaw of the case and a side surface of the conductive light diffusion molding body. The capacitive switch module according to claim 6, wherein a light diffusing film is interposed horizontally inside the conductive light diffusing molding. A case having a tubular shape in which a top and a bottom are opened and a protruding mounting jaw is formed at an inner side of the side wall; It includes a capacitive sensor chip that detects the change in capacitance according to the contact of the human body, a peripheral circuit part, and an external connection terminal, and is horizontally spread over the protruding mounting jaw. A printed circuit board installed; A conductive light diffusion molding member filling the upper portion of the protruding mounting jaw; A transparent conductive elastic body installed on the light diffusion molding body and protruding out of the case; And And a molding compound filling a lower portion of the protruding mounting jaw of the case so that the external connection terminal penetrates downward. And a mirror coating film is formed on at least one of an inner surface of the side wall on the protruding mounting jaw of the case and a side surface of the conductive light diffusion molding body. A case having a tubular shape in which a top and a bottom are opened and a protruding mounting jaw is formed at an inner side of the side wall; A printed circuit board including a capacitive sensor chip detecting a change in capacitance due to contact of a human body, a peripheral circuit part, and an external connection terminal, which is horizontally spread over the protruding mounting jaw, and a sensing pad is installed at an edge of an upper surface of the printed circuit board; A conductive elastic body filled in a predetermined thickness so as not to exceed the case on the protruding mounting jaw; It is installed to protrude out of the case on the conductive elastic body, a reflective thin film is installed on the bottom surface of the light guide plate and a light emitting device electrically connected to the circuit portion of the printed circuit board is coupled to the side, and the light emitted from the light emitting device is A light module in which mirror coating is made to proceed only toward the light guide plate; And And a molding compound filling a lower portion of the protruding mounting jaw of the case so that the external connection terminal penetrates downward. The capacitive switch module according to claim 9, wherein a mirror coating film is formed on at least one of an inner surface of the side wall on the protruding mounting jaw of the case and a side of the conductive elastic body. 10. The electrostatic discharge device according to claim 1, 2, 4, 5, 6, 8, or 9, wherein the plurality of light emitting devices emit light of different colors. Capacitive switch module. 10. The method according to claim 1, 2, 4, 5, 6, 8, or 9, wherein the side and bottom surfaces of the case are connected to the ground of the printed circuit board using a conductive material. Capacitive switch module comprising a coating comprising a capacitance shielding.

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