JP2606869Y2 - Thin illuminated switch - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a thin illuminated switch provided with an LED.

[0002]

2. Description of the Related Art A conventional illuminated switch has been disclosed in Japanese Patent Application Laid-Open No. 2-276118. In this illuminated switch, an attachment body as a housing having two concave portions is formed by insert-molding a connection terminal for the switch and an electrode terminal for the LED. The electrode is exposed in each of the concave portions,
A push spring, a push plate for pushing the push spring, and a cover plate for holding the push spring were housed or attached in one recess, and an LED chip was housed in the other recess and sealed with a light-transmitting resin. .

[0003]

In the conventional illuminated switch as described above, the switching section and the light emitting section are separated from the center of the housing to the left and right, and the surface mounting of electronic parts, which has been rapidly progressing in recent years, has been developed. He could not cope with the movement. That is, in order to cope with surface mounting, it is necessary to flatten the position of the center of gravity on the upper surface side of the housing and secure an area larger than the suction surface of the vacuum suction collet (nozzle) of the automatic mounting device. However, in the case of the illuminated switch, the position of the center of gravity is near the boundary between the switching unit and the light emitting unit, and there is a large unevenness.

When a housing is formed by insert molding, it is necessary to form a concave portion to provide a housing portion for an LED chip or the like, or to provide a contact or an electrode in the concave portion. The shape of the lead frame on which the electrodes are formed has become complicated, which has been an obstacle to miniaturization and thinning. In particular, in devices that are rapidly becoming smaller and thinner such as mobile phones in recent years, the thinning of the illuminated switch becomes an indispensable important factor for making the entire device smaller and thinner. It has been desired to further reduce the size and thickness of the illuminated switch.

The present invention has been made in view of the above problems, and an object of the present invention is to provide a thin illuminated switch which can be automatically mounted and can be reduced in size and thickness.

[0006]

SUMMARY OF THE INVENTION A thin illuminated switch of the present invention is provided.
Switch has insulating properties and a cutout on the side.
And a first circuit pattern formed on the substrate;
A ring-shaped pattern formed on a plate and the ring-shaped pattern
And a contact pattern provided at the center of the
A two-circuit pattern, the first circuit pattern, and the ring
Drawn out from the shape pattern to the notch of the substrate
And from the contact pattern to the
Through the through holes provided in the
Wired to the back side of the board and pulled to the notch of the board
Multiple through-hole terminals formed by exiting
And the first and second circuit patterns having an insulating property.
First and second openings at positions corresponding to the
And a frame fixed on the substrate, and a frame in the first opening.
A wire bonder mounted on the first circuit pattern;
LED chip connected and connected to the first opening
Transparent resin filled in the mouth to seal the LED chip
Part and the outer periphery of the ring-shaped pattern in the second opening
Contact and invert the contact pattern
A tactile spring to be touched, and a tactile spring mounted on the tactile spring.
Presses around the center of the tactile spring to turn it over.
And the second opening having heat resistance and flexibility.
A sheet that covers and seals the whole.
Make the height of the grease part and the height of the sheet the same, and
Flattened to enable suction for automatic mounting
Is also.

[0007]

In the thin illuminated switch of the present invention, since the housing is formed by fixing the substrate and the frame, a circuit pattern can be formed on the substrate in advance, and the thickness of the frame and the substrate is also free. Can be changed to
The thickness can be reduced. In addition, since the tactile spring is configured to be pressed using the seat and the plunger plate, the switching unit can be made thin and flat,
This makes the height of the switching unit and the light emitting unit the same,
Enables surface mounting by automatic mounting.

[0008]

1 is an exploded perspective view of a thin illuminated switch according to an embodiment of the present invention, FIG. 2 is a perspective view of the thin illuminated switch, FIG. 3 is a cross-sectional view thereof, and FIG. 4 is a plan view of a substrate. is there. 2
Is an insulating substrate made of glass epoxy or the like. Reference numeral 4 denotes a first circuit pattern including substantially rectangular independent patterns 6 to 12 formed on the substrate 2. Reference numeral 14 denotes a second circuit pattern including a ring pattern 16 formed on the substrate 2 and a contact pattern 18 formed at the center thereof. The patterns 6 to 12 and the ring-shaped pattern 16 are respectively drawn out to notches provided on the side surface of the substrate 2 to form through-hole terminals 20. The contact pattern 18 is drawn out to the back surface side of the substrate 2 through a through hole 22 provided in the ring-shaped pattern 16 of the substrate 2, and is further drawn out therefrom to a cutout on the side surface of the substrate 2, and the through hole terminal 20 is formed. Is formed. The cutouts provided on the side surfaces of the substrate 2 are formed by separating through holes of the collective substrate when a large collective substrate capable of taking a large number of substrates 2 is individually cut by a slicing machine. It was done.

Reference numeral 24 denotes an insulating frame made of a synthetic resin or the like, having first and second openings 24a and 24b at positions corresponding to the first and second circuit patterns 4 and 14, respectively. This frame 2
Reference numeral 4 denotes an adhesive printed on the back side, and is fixed on the substrate 2.

Reference numerals 26 and 28 denote L emitting red and blue light, respectively.
ED chip. LED chip 2 in this embodiment
6, 28 are respectively mounted on patterns 8, 10;
Wire bonding to the patterns 6 and 12 is performed by gold wires 30 and 32, respectively. In this embodiment, 2
Although the number of LED chips is used, the number, the combination of colors, and the like can be arbitrarily selected.
Also increase or decrease the number of twelve.

Reference numeral 34 denotes a transparent resin portion made of an epoxy resin or the like.
0 and 32 are sealed.

Reference numeral 36 denotes a reversible tactile spring whose center is curved toward the front side, which is accommodated in the second opening 24b, and is placed on the substrate 2 so that its outer peripheral portion is in contact with the ring-shaped pattern 16. .

Reference numeral 38 denotes a plunger plate for pressing around the center of the tactile spring 36 to reverse it.

Reference numeral 40 denotes a heat-resistant and flexible sheet made of a polyimide sheet or the like, which has an adhesive applied to the back surface and adheres to the surface of the frame 2 so as to cover and seal the entire second opening 24b. Have been.

In the thin illuminated switch according to the present embodiment having the above-described configuration, when the sheet 40 is pressed, the center of the tactile spring 36 is inverted to come into contact with the contact pattern 18,
The contact pattern 18 and the ring-shaped pattern 16 conduct through the tactile spring 36 to be turned on. As a result, power is supplied to one of the LED chips 26 and 28 based on a signal from a circuit of a device to which the thin illuminated switch is attached, and the light is turned on.

In the thin illuminated switch of this embodiment, the first and second circuit patterns 4 and 14 are provided on the surface of the substrate 2.
Is formed, and the frame 24 can be formed and processed as a single body. Therefore, the thickness of the substrate 2 and the frame 24 can be reduced.

As shown in FIG. 3, the upper surfaces of the sheet 40 and the transparent resin portion 34 are formed so as to be flush with each other. Therefore, the upper surface of the thin illuminated switch becomes flat, and as shown in FIG.
4 can be adsorbed. In addition, as shown in FIG.
A slight groove 2 between the first and second openings 24a, 24b
The grooves 4c are grooves for preventing the transparent resin from dripping into the first openings 24a when the transparent resin portion 34 is formed. The groove 24c can be easily filled and flattened by extending the sheet 40.

The contact pattern 18 formed on the substrate 2 is drawn out through the through hole 22, and the outer periphery of the tactile spring 36 and the ring pattern 16 are formed.
There is no need to take any special insulation measures since it does not come into contact with.

In this embodiment, the circular tactile spring 36 is used so as to conform to the shape of the second opening 24b of the frame 24. The plan shape of the second opening 24b is shown in FIG. In addition to the rectangular shape, the planar shape of the tactile spring 36 may be changed to a rectangular shape.

[0020]

According to the present invention, the structure of the substrate and the frame can be reduced, so that a thin illuminated switch can be provided.

Further, since the surface can be flattened, it can be supplied as a surface mount component which can be automatically mounted.

Furthermore, since insert molding is not required, there is no need for expensive equipment investment such as insert molding equipment.

[Brief description of the drawings]

FIG. 1 is an exploded perspective view of a thin illuminated switch according to an embodiment of the present invention.

FIG. 2 is a perspective view of the thin illuminated switch shown in FIG.

FIG. 3 is a sectional view of the thin illuminated switch shown in FIG. 2;

FIG. 4 is a plan view of the substrate shown in FIG. 1;

FIG. 5 is an explanatory diagram showing a state in which a thin illuminated switch is sucked by a suction nozzle of an automatic mounting device.

FIG. 6 is an exploded perspective view showing an example using another tactile spring.

[Explanation of symbols]

 2 board 4 1st circuit pattern 6-12 pattern 14 2nd circuit pattern 16 ring pattern 18 contact pattern 20 through hole terminal 22 through hole 24 frame 24a 1st opening 24b 2nd opening 26, 28 LED chip 34 transparent resin Part 36 Tactile spring 38 Plunger plate 40 Seat

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int. Cl. ⁷ , DB name) H01H 13/02 H01L 33/00

Claims (1)

(57) [Scope of request for utility model registration] An insulative material having a notch on a side surface.
A substrate, a first circuit pattern formed on the substrate, a ring-shaped pattern formed on the substrate,
And the contact pattern provided in the center of the pattern.
From the obtained second circuit pattern, the first circuit pattern and the ring-shaped pattern.
When formed by being pulled out to the notch of the substrate
Both, from the contact pattern into the ring-shaped pattern
Wiring on the back side of the substrate via the provided through hole
And pulled out to the notch of the substrate
A plurality of through-hole terminals to be formed , the first and second circuit patterns having an insulating property;
Has first and second openings respectively at positions corresponding to
A frame fixed on the substrate, and mounted on the first circuit pattern in the first opening;
LED chip connected by wire bonding
And filling the first opening to seal the LED chip.
An outer peripheral portion is in contact with the transparent resin portion and the ring-shaped pattern in the second opening.
Contacts the contact pattern by reversing
A tactile spring and a center of the tactile spring installed on the tactile spring
A plunger plate that presses near and reverses , has heat resistance and flexibility, and covers the entire second opening;
A sheet to be sealed, wherein the height of the transparent resin portion and the height of the sheet are the same.
To flatten the center of the top surface and
A thin illuminated switch characterized by the fact that it has been made possible .