KR101478511B1 - Light emitting keypad module and manufacturing method thereof - Google Patents

Light emitting keypad module and manufacturing method thereof Download PDF

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Publication number
KR101478511B1
KR101478511B1 KR1020140031734A KR20140031734A KR101478511B1 KR 101478511 B1 KR101478511 B1 KR 101478511B1 KR 1020140031734 A KR1020140031734 A KR 1020140031734A KR 20140031734 A KR20140031734 A KR 20140031734A KR 101478511 B1 KR101478511 B1 KR 101478511B1
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KR
South Korea
Prior art keywords
light
module
film
light guide
guiding
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KR1020140031734A
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Korean (ko)
Inventor
손도현
Original Assignee
(주)모던테크
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Priority to KR1020140031734A priority Critical patent/KR101478511B1/en
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Publication of KR101478511B1 publication Critical patent/KR101478511B1/en

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    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
    • G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
    • G06F3/02—Input arrangements using manually operated switches, e.g. using keyboards or dials
    • G06F3/0202—Constructional details or processes of manufacture of the input device
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H13/00—Switches having rectilinearly-movable operating part or parts adapted for pushing or pulling in one direction only, e.g. push-button switch
    • H01H13/70—Switches having rectilinearly-movable operating part or parts adapted for pushing or pulling in one direction only, e.g. push-button switch having a plurality of operating members associated with different sets of contacts, e.g. keyboard
    • H01H13/702—Switches having rectilinearly-movable operating part or parts adapted for pushing or pulling in one direction only, e.g. push-button switch having a plurality of operating members associated with different sets of contacts, e.g. keyboard with contacts carried by or formed from layers in a multilayer structure, e.g. membrane switches
    • H01H13/704—Switches having rectilinearly-movable operating part or parts adapted for pushing or pulling in one direction only, e.g. push-button switch having a plurality of operating members associated with different sets of contacts, e.g. keyboard with contacts carried by or formed from layers in a multilayer structure, e.g. membrane switches characterised by the layers, e.g. by their material or structure
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H13/00—Switches having rectilinearly-movable operating part or parts adapted for pushing or pulling in one direction only, e.g. push-button switch
    • H01H13/70—Switches having rectilinearly-movable operating part or parts adapted for pushing or pulling in one direction only, e.g. push-button switch having a plurality of operating members associated with different sets of contacts, e.g. keyboard
    • H01H13/83—Switches having rectilinearly-movable operating part or parts adapted for pushing or pulling in one direction only, e.g. push-button switch having a plurality of operating members associated with different sets of contacts, e.g. keyboard characterised by legends, e.g. Braille, liquid crystal displays, light emitting or optical elements
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H13/00—Switches having rectilinearly-movable operating part or parts adapted for pushing or pulling in one direction only, e.g. push-button switch
    • H01H13/70—Switches having rectilinearly-movable operating part or parts adapted for pushing or pulling in one direction only, e.g. push-button switch having a plurality of operating members associated with different sets of contacts, e.g. keyboard
    • H01H13/88—Processes specially adapted for manufacture of rectilinearly movable switches having a plurality of operating members associated with different sets of contacts, e.g. keyboards
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M1/00—Substation equipment, e.g. for use by subscribers
    • H04M1/02—Constructional features of telephone sets
    • H04M1/22—Illumination; Arrangements for improving the visibility of characters on dials
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
    • H05K9/00—Screening of apparatus or components against electric or magnetic fields
    • H05K9/0073—Shielding materials
    • H05K9/0081—Electromagnetic shielding materials, e.g. EMI, RFI shielding
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H2205/00—Movable contacts
    • H01H2205/016—Separate bridge contact
    • H01H2205/024—Means to facilitate positioning
    • H01H2205/026—Adhesive sheet
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H2219/00—Legends
    • H01H2219/002—Legends replaceable; adaptable
    • H01H2219/014—LED
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H2219/00—Legends
    • H01H2219/054—Optical elements
    • H01H2219/062—Light conductor

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • General Engineering & Computer Science (AREA)
  • Theoretical Computer Science (AREA)
  • Electromagnetism (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Human Computer Interaction (AREA)
  • General Physics & Mathematics (AREA)
  • Signal Processing (AREA)
  • Push-Button Switches (AREA)

Abstract

The present invention relates to a light emitting keypad module and a method of manufacturing the same. The light emitting keypad module according to the present invention includes a flexible PCB, And a light diffusion film laminated on the upper surface of the light guide film, wherein the light guide film is provided on one side of the LED inside the closed loop type barrier, The present invention relates to a light emitting keypad module, in which a light leakage phenomenon is generated by a light emitting module, a light emitting module, a closed loop type barrier, and a one side adhesive film attached to the LED and having a key pattern formed thereon. And the manufacturing method according to the present invention is advantageous in that the production yield can be improved by shortening the assembly time, the labor cost can be reduced, and the defect rate can be reduced. And efficiency, and it shows high quality reliability by originally eliminating the worry of occurrence of defects.

Description

[0001] LIGHT EMITTING KEYPAD MODULE AND MANUFACTURING METHOD THEREOF [0002]

The present invention relates to a light emitting keypad module and a manufacturing method thereof, and more particularly, to a light emitting keypad module in which light leakage phenomenon is effectively removed, And an efficient manufacturing method of a light emitting keypad module having high economical efficiency and efficiency that can achieve reduction in labor cost and reduction in defect rate.

In general, a mobile phone (Feature Phone), MP3 (Moving Pictures Experts Group (MPEG) -1 Audio Layer-3), a PMP (Portable Media Player), a PDA (Personal Digital Assistant) A portable mobile device such as a notebook, an ultra-mobile personal computer (UMPC), a tablet PC, a smart phone, a navigation device, a portable game device (Play Station Portable) The light emitting module to be used, specifically, the light emitting keypad module is used as a switch unit for performing signal generation and various additional functions. In the nighttime or in a dark place, for example, a pattern for a menu key or a return cancel key, And a separate illuminating illumination unit is provided to enable easy identification and operation of the buttons.

As a conventional light emitting module, there are known an electro luminescence (EL) keypad module, a top view keypad module, and a side view keypad module.

The EL (electro luminescence) keypad module is generally constructed such that a dome sheet, an EL sheet, and a keypad are placed on a PCB. When a keypad is pressed, a metal piece of the dome sheet is connected to a contact terminal of the PCB, The sheet is illuminated to uniformly illuminate the keypad.

The EL keypad module described above has advantages of being slim, high quality, uniform lighting and various colors, but it requires a large power consumption, an inverter, is relatively more reputable than an LED, has a noise And thus the reliability is inferior. In particular, an increase in production cost can not be avoided.

Meanwhile, in order to overcome the problems of the above-described EL keypad module, a general top view keypad module of an indirect lighting type has a dome sheet on a PCB of a mobile device having a plurality of buttons such as a feature phone, Film and a keypad. When the keypad is pressed, the metal piece of the dome sheet and the contact terminal of the PCB are brought into contact with each other so that the light emitting diode emits light as a surface light source by the light dispersion and direction change of the light- There is a problem that a large number of LEDs are required and the luminance deviation is large and the thickness is increased.

Similarly, a general side view keypad module of indirect lighting type is one in which one or two LEDs are arranged on the side of a PCB so as to be slim, unlike the above-mentioned top view keypad module, and is widely applied to smart phones.

FIGS. 5A and 5B are photographs showing on / off states of a general side view keypad module, in which a keypad is composed of a menu key and a cancel key.

Generally, a light guide module applied to a keypad as described above is a polycarbonate film or sheet, and a specific pattern is formed on one surface thereof to obtain a uniform light source with uniform luminance by eliminating unevenness in luminance and quadrangular shadow depending on the distance A light guide film unit in which a light guiding film (LGF: light guide film) is cut into a predetermined keypad shape and dimensions, and a separate light guide film unit for obtaining a homogeneous and smooth surface light source stacked on the opposite side of the pattern formation side of the light guide film unit A light diffusion film unit and optionally an electromagnetic wave shielding film unit for shielding electromagnetic waves which may be stacked thereon, and they are attached and assembled to a keypad unit formed on a PCB of a mobile device using a double-sided transparent adhesive film.

Accordingly, the light guide module for the keypad is mounted on the PCB of the mobile device in the form of a unitary composite film.

A method of manufacturing the light guide module proposed in Korean Patent Laid-Open No. 10-2014-0005609 (published on Apr. 15, 2014) by the present applicant will be sequentially described with reference to process explanatory views in FIGS. 6A to 6F.

First, in the light guiding film pattern transfer step of FIG. 6A, a light guiding film 2 is prepared by stamping a predetermined desired light guiding pattern 2a on one side of a polycarbonate film, and then the protective film 2c is adhered .

Next, in the light-guiding film unit forming step of Fig. 6B, the periphery of each light-guiding pattern 2a on the light-guiding film 2 is press-cut to form a light-guiding film unit 2b, Is transferred onto a substrate (substrate) sheet 5 such as polyethylene terephthalate formed, and the protective film 5a is adhered.

Next, the light diffusion film unit forming step of FIG. 6C is carried out, and a light diffusion film (not shown) having an adhesive layer formed on one surface thereof is stamped to have a shape and dimensions corresponding to the above light guide film unit 2b A plurality of light diffusion film units 3a having a relatively small size are formed on a substrate sheet 5 such as polyethylene terephthalate and then adhered to the substrate sheet 5 to adhere the protective film 5a.

Next, a light diffusion film laminate unit forming step of FIG. 6D is followed. A plurality of light guide film units 2b formed in the light guiding film unit forming step shown in FIG. 6B are transferred from a substrate 5 to which a light guiding film unit 5a are removed and the protective film 5a is removed from the substrate 5 to which a plurality of light diffusion film units 3a formed in the light diffusion film unit forming step shown in Fig. 6c are adhered, The light diffusion film units 3a of the light diffusion film units 3a are adhered to each of the light guide film units 2b through the tweezers.

Then, as shown in Fig. 6E, the protective and transfer film unit 8 formed on the substrate sheet 7 as described above is further adhered.

Finally, as shown in FIG. 6F, the light-guiding module 1 'manufactured through the above-mentioned troublesome and troublesome work is mounted on the keypad portion 9 of the mobile device PCB 9 by using the above- (Without reference numerals) using a double-faced adhesive tape.

However, the conventional light guiding module 1 'as described above has a problem that a light leakage phenomenon occurs from the side when the module is lighted after final assembly, and the conventional manufacturing method has a problem in that the light diffusion film lamination unit Since the light diffusing film unit 3a is separately attached and assembled onto the light guide film unit 2b, there is a high possibility of adhesion defect due to the occurrence of interlayer bubbles, and it is difficult to stick the light diffusion film unit 3a to an accurate position. And it is difficult to avoid defective phenomenon due to being shot at the time of tweezers operation, and it takes a lot of time and worker for the work, which is inferior in process efficiency and has become a direct factor for raising manufacturing cost.

The conventional light emitting keypad module 30 'using the conventional light guide module 1' as described above is mounted on a flexible PCB (not designated) as shown in the schematic plan view of FIG. The light rays incident on one side of the light guide module 1 'from the LED 40 that is emitted from the LED 40 are emitted forward through the front portion of the light guide module 1' there is a problem that a light leakage phenomenon occurs.

Therefore, in order to prevent the light leakage phenomenon of the light guide module as described above, in the related art, manual work for attaching a light-shielding tape having a small width to the side surface by using tweezers requires a cumbersome and precise work, And thus it is not applicable to a light guide module for a keypad other than a display window.

Korean Patent Publication No. 10-2014-0005609 (published on April 15, 2014)

Accordingly, an object of the present invention is to provide a light emitting keypad module capable of effectively and completely eliminating the light leakage phenomenon of the light emitting keypad module.

It is another object of the present invention to provide an effective and efficient method of manufacturing a light emitting keypad module without light leakage phenomenon.

According to a preferred aspect of the present invention, there is provided a PCB comprising: a flexible PCB; An LED mounted on the flexible PCB; A closed annular barrier attached through a double-sided adhesive film of a black adhesive film for light shielding and made of black high density polyurethane foam; A light guiding module including a light guiding film having a light guiding pattern formed on a bottom surface thereof and a light diffusion film laminated on the light guiding film, the light guiding module being located at one side of the LED inside the closed annular barrier; There is provided a light emitting keypad module composed of the above light guide module, a closed loop type barrier and a one-sided adhesive film made of a black adhesive film for light shielding attached to the LED and having a key pattern formed thereon.

Here, the light-guiding module may include a light-shielding layer formed by printing on three sides of the light-guiding film and the light-diffusing film, except for the light incidence side.

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In addition, the light guide module may be formed by stacking an electromagnetic wave shielding film on the upper surface of the light diffusion film.

According to a preferred embodiment of the present invention, there is provided a light-diffusing film comprising: (A) a composite laminated film comprising a light-diffusing film having a pressure-sensitive adhesive layer formed on a back surface of a light- (B) a light guiding module acquisition step of cutting out a plurality of light guiding pattern areas formed on the composite laminated film to take out a plurality of light guiding modules; (C) A step of attaching a closed annular barrier made of a black high-density polyurethane foam to the outside of each of the light guiding modules by being attached to the light guiding module carrier in parallel with each other, (D) A double-sided adhesive film attaching step of attaching a double-sided adhesive film made of a black adhesive film for light shielding; (E) positioning the light guide module carrier on a plurality of flexible PCBs having a predetermined shape and having LEDs attached thereto, and then mounting the light guide module carrier and the closed loop type barrier on each of the flexible PCBs for a plurality of keypads And a closed loop type barrier attaching step for attaching the light emitting keypad module to the light emitting keypad module.

Optionally, in the carrier-forming step in step (C) above, the closed annular barrier may be pre-attached with the LED on the flexible PCB without being bonded to the carrier.

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The step (B) of obtaining the light guiding module (B) comprises the steps of (B1) simultaneously cutting the periphery of each light guiding pattern on the composite laminated film into 'n' or 'C' (B2) a light shielding layer forming step of printing the light shielding layer through the cutting slot; and (B3) a step of forming a light shielding layer on the remaining one side of each of the preformed light guide modules, And a light guiding module acquiring step of simultaneously cutting and taking out a plurality of light guiding modules.

(B2) the base plate lamination step of attaching a base plate having a tacky portion in each region corresponding to each of the light guide module regions previously shaped (B2-1) 2) printing a light shielding layer on three sides of each of the light guide modules previously shaped by the silk screen printing through the cutting slot, and (B2-3) removing the base plate. have.

If necessary, the electric wave shielding film may further be laminated on the light diffusion film in the composite laminated film forming step (A).

The present invention according to the present invention is characterized in that the light emitting keypad module uses a closed annular barrier for light shielding and optionally also forms a light shielding print layer on three sides of the light guide module, The light leakage phenomenon of the side surface is totally eliminated originally and the manufacturing method of the light emitting keypad module according to the present invention is advantageous in that it can improve the production yield and reduce the labor cost and the defect rate by shortening the assembly time, And has a high process efficiency, productivity and economy that can reduce the labor cost and the defect rate as well as remarkably shorten the manufacturing time by performing a plurality of light guide film units at the same time in units of assemblies, There is no fear, and there is no possibility of the occurrence of the sticking position shift or the occurrence of tweezers Shows high quality reliability by originally eliminating the risk of badness occurrence.

1A is a schematic plan view of a light emitting keypad module according to the present invention.
Fig. 1B is a side sectional view of Fig. 1A. Fig.
2 is a laminated structure of a light guide module applied to the light emitting keypad module of FIG.
FIG. 3 is a process explanatory view illustrating a manufacturing method of the light guide module of FIG. 2;
Fig. 4 is a perspective view showing a light-guiding module in a state of attaching a base plate on which a light-shielding printing layer is formed after primary pressing.
5A and 5B are photographs showing on-off states of a general smart phone adopting a touch-type side view keypad system, respectively.
6 is a process explanatory view illustrating a conventional method of manufacturing a light guide module.
7 is a schematic plan view of a conventional light emitting keypad module.

First, the term " mobile device " used throughout the specification of the present invention includes a mobile phone (Feature Phone), MP3 (Moving Pictures Experts Group (MPEG) -1 Audio Layer-3) Portable electronic devices, portable media players, personal digital assistants (PDAs), laptop laptops, mini notebooks, ultra-mobile personal computers (UMPCs), tablet PCs, smart phones, Mobile devices such as mobile devices, mobile phones, gaming devices, gaming devices, gaming devices, gaming devices, gaming devices, and gaming devices.

The term " light-guiding module " used throughout this specification is defined to mean a component except for a luminescent light source in a touch-type keypad module of a mobile device according to the above definition unless otherwise specified .

In addition, the term " light emitting key pad module " used throughout this specification is intended to encompass the aforementioned light guide module, a flexible PCB equipped with a light emitting LED, and a mobile It is defined as the touch-sensitive keypad module of the device.

The term " closed loop barrier " used throughout this specification is intended to encompass both low-profile and low-vibration applications, which are mainly applied for medium to low frequency vibration and shock absorption, and for sealing with excellent sealing and airtightness to curved and uneven surfaces, Refers to a high density polyurethane foam having a low modulus of elasticity and specifically a high density polyurethane foam sheet having low compressive restoring force loss, high sealing ability, high energy absorption property, non-staining property, high dimensional stability and high processing efficiency, Quot; PORON " which is a microcellular high density polyurethane foam having a homogeneous pore size and distribution of Roger-INOAC.

The above-mentioned fork prevents the sound loss, the noise prevention, the air tightness, the shock absorption, the external pressure protection, the vibration prevention, the vibration prevention, the interval correction, and the sound cracking prevention in various electric and electronic products such as microphone, LCD, buzzer, , And is widely used for the purpose of prevention of breakage and contamination, prevention of vibration, etc. Therefore, further detailed description thereof will be omitted.

Hereinafter, a manufacturing method of the present invention will be described with reference to the drawings.

1A and 1B are a schematic plan view and a side sectional view, respectively, of the light emitting keypad module 30 according to the present invention, and will be described for the convenience of explanation.

The light emitting keypad module 30 according to the present invention includes a flexible PCB 9 positioned on one side (the bottom side in FIG. 1A and the upper side in FIG. 1B), a double-side adhesive film 60 interposed therebetween, A closed annular barrier 50 attached to the flexible PCB 9; an LED 40 located at one side of the inside of the closed annular barrier 50 and electrically connected to the flexible PCB 9; A light guiding module (1) positioned opposite to the LED (40) on the other side inside the closed annular barrier (50); And an adhesive film 70 attached to the light guide module 1 and the closed loop type barrier 50 and the LED 40 and having a predetermined light transmission pattern formed on the light guide module 1 .

Here, the closed loop type barrier 50 described above is preferably composed of black high-density polyurethane foam or a sheet thereof filled with a filler such as activated carbon so as to be suitable for light shielding. The double-sided adhesive film 60 And the one-sided adhesive film 70 are also preferably of the black color series so as to be suitable for light shielding.

By applying the closed annular barrier 50 as described above, the light emitted from the LED 40 is converted into a surface light source through the light guide film 2 of the opposed light guide module 1, Is homogenized through the light diffusion film 3 attached by the adhesive layer 1b and then emitted to the outside through a predetermined pattern formed on the one side adhesive film 70 Since the remaining area except for a predetermined pattern (not shown) is shielded from light, the light leakage phenomenon is effectively removed.

In addition, in order to prevent a more complete light leakage phenomenon, a light shielding printing layer 11 is selectively formed on the remaining three sides of the light guide module 1, It is possible to more completely and effectively remove the light leakage phenomenon in the light emission of the light emitting keypad module 30 of the mobile device, which is also within the scope of the present invention.

2 is a laminated structure of a light guide module according to the present invention. The laminated structure of the light guide module 1 according to the present invention is shown in FIG. 2. The light guide module 1 is formed by a conventional means such as stamping or etching A light-guiding film 2 in which a large number of light-guiding patterns 2a are formed at a predetermined interval and a light-diffusing film 3 laminated on the light-guiding film 2, and in the illustrated example, (4) are laminated on the upper surface (3) of the above-mentioned light diffusion film.

Here, the transparent double-sided adhesive film (see reference numeral 1b in Fig. 1B) is not shown for convenience.

The above-mentioned light diffusion film 3 may be one in which a predetermined pattern having a fine surface concave-convex structure is stamped on one surface or a light diffusion body is homogeneously dispersed therein, though not shown, and such a structure is known.

On the other hand, although not shown in Fig. 2, the light guide module 1 formed by cutting the composite laminated film 1a of the light guide film 2 and the light diffusion film 2, as shown in Fig. 4 And the light shielding layer 11 is formed on the remaining three sides except the light entrance side, so that the light leakage phenomenon from the above three sides can be effectively removed when the keypad module of the mobile device emits light.

The light guide film 2, the light diffusion film 3 and the electromagnetic wave shielding film 4 may be formed of various materials. Generally, the light guide film 2 and the electromagnetic wave shielding film 4 are made of polycarbonate or polyethylene terephthalate film or sheet. (2a) are publicly known, and therefore the description thereof will be omitted.

On the other hand, the above-mentioned light diffusion film 3 is intended to make the surface light source light emitted to the front surface through the light guide film 2 more uniform by light diffusion, but uniformly irradiated light.

The above-mentioned light diffusing pattern is well known in the art, and the light diffusing material described above is also known in the art, and in addition thereto, for example, silica (refractive index: 1.47), alumina (refractive index: 1.50 to 1.56) glass: refractive index 1.51), calcium carbonate (CaCO 3 : refractive index 1.51), talc (refractive index 1.56), mica (refractive index 1.56), barium sulfate (BaSO 4 : refractive index 1.63), zinc oxide (ZnO: refractive index 2.03) , cesium oxide (CeO2: refractive index 2.15), titanium dioxide (TiO 2: refractive index of 2.50 ~ 2.71), the inorganic light diffusion, such as, iron oxide (2.90) form; Or polyacrylate (refractive index 1.49), polyurethane (refractive index 1.51), polyethylene (refractive index 1.54), polypropylene (refractive index 1.46), nylon (refractive index 1.54), polystyrene 1.59), polymethylmethacrylate (refractive index: 1.49), polycarbonate (refractive index: 1.59), or copolymers of monomers thereof, or any mixture thereof .

Next, a method of manufacturing the light emitting keypad module 30 according to the present invention will be described.

The manufacturing method according to the present invention can basically be composed of the following steps.

(A) Composite laminated film (1a) Formation step:

A light diffusion film (3) having a pressure-sensitive adhesive layer formed on the back surface of a light guide film (2) having a plurality of light guide patterns (2a)

(B) The light-guiding module obtaining step:

A plurality of light guide patterns 2a formed on the composite laminated film 1a are cut to take out a plurality of light guide modules 1. [

(C) carrier forming step:

The plurality of light guiding modules 1 are attached to the light guiding module carrier 20 in parallel with each other with a predetermined distance therebetween, and a closed annular barrier made of a black high density polyurethane foam 50) is attached.
(D) Attachment of double-sided adhesive film:
On the upper surface of the closed loop type barrier 50, a double-sided adhesive film 60 made of a black adhesive film for light shielding is attached.

(E) Attaching the light guide module and closed loop type barrier:

The light guide module carrier 20 is placed on a plurality of flexible PCBs 9 for a keypad having predetermined shapes and LED 40 attached thereto and then a plurality of flexible PCBs 40 for a keypad The light guide module 1 and the closed loop type barrier 50 described above are attached at the same time.

Optionally, the closed annular barrier 50 may be pre-affixed with the LED 40 on the flexible PCB 9, without adhering the closed annular barrier 50 to the carrier in the carrier formation step in step (C) , Which is also within the scope of the present invention.

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If necessary, in the step of forming the composite laminated film (1a), the electric wave shielding film (4) is further laminated on the light diffusion film (3) via a surface adhesive film (not shown) Of course.

3 and 4, the light guide module 1 applied to the light emitting keypad module 30 according to the present invention may further include a light guide module The light-shielding printing layer 11 may be formed on the remaining three sides except for one side, which is also within the scope of the present invention.

FIG. 3 is a process explanatory view illustrating a manufacturing method of an optional light guide module 1 of the present invention for application to the light emitting keypad module 30 according to the present invention, and FIG. 4 is a cross- The light guide module 1 is optional in the present invention with the base plate 10 on which the light shielding print layer 11 is formed after the formation of the light guide module 1. The light guide module 1 will now be described for convenience of explanation.

The manufacturing method of the light guide module 1 includes a light diffusion film 3 having an adhesive layer (not shown) formed on the back surface of a light guide film 2 having a plurality of light guide patterns 2a formed on its front surface, (See FIG. 2 and FIG. 3 (a)) for joining the film 4 and the outer periphery of each light guide pattern 2a on the composite laminated film 1a are referred to as "n" (Not shown) by three-sided cutting to form a cutting slot (not shown) at the same time as a light-shielding layer (not shown) or a " 4) for printing the light-shielding layer 11, and the remaining one side of each of the pre-shaped light-shielding modules having the light-shielding layer 11 formed thereon at the same time to form a plurality of light-guide modules (refer to FIG. 1) from the light guide module.

The steps of forming the composite laminated film 1a will now be described in detail. A plurality of light guide patterns (not shown in FIG. 2 and FIG. 6) are stamped or etched, The light diffusing film 3 on which the adhesive layer is formed on the upper surface of the film 2 facing the above light guide pattern 2a and optionally the electromagnetic wave shielding film 4 is pressed uniformly from one side So that the composite laminated film 1a without bubbles is produced.

The composite laminated film 1a may be formed by forming a plurality of light-emitting patterns 2a formed on the light-guiding film 2 in a peripheral portion of the light-out pattern 2a by a suitable cutting means such as press cutting or sawing or laser cutting, The preliminary light guide module is pre-shaped by simultaneously cutting the three edges in a 'C' shape to form a cutting slot (not shown).

The purpose of leaving a frame without a cutting slot is to prevent the formation of a light shielding layer on one side of the incident light incident on the light source in the light shielding layer forming step which will be described later.

Meanwhile, in the light-shielding layer forming step, as shown in FIG. 2 (b), a base plate 10 having a tacky portion formed in each region corresponding to each of the light- Printing the light shielding layer 11 on the three sides of each of the preliminary light guide modules preformed by silk screen printing through the cutting slot (not shown) ).

The base plate 10 attached in the base plate laminating step may be attached to each of the preliminary light guide modules as shown in Fig. 2 (b) The light guide plate 2 is attached to the rear surface of the light guide plate 2a, respectively). In some cases, the light guide plate may be formed as a single film including a plurality of preformed light guide modules.

The material of the base plate 10 is not particularly limited, but polyethylene terephthalate, polycarbonate, or the like can be used.

Therefore, when the light shielding layer 11 is formed by suitable printing means such as silk screen printing, the light shielding printing paint seeps through a cutting slot (not shown) formed on three sides, (That is, the region in which the light guide pattern 2a of the light guide film 2 is formed).

4, the light-shielding light-cured coating material is formed by forming the light-shielding layer 11 on three sides excluding the light incidence surface (i.e., the front surface) Out portion 11a is formed in the outer region excluding the region where the light incident surface is formed, and one side of the four side surfaces forming the light incident surface is cut by a known means as described above, and the base plate 10 The light guide module 1 in which the light shielding printed layer 11 according to the present invention is formed on three sides can be efficiently and effectively obtained.

On the other hand, it goes without saying that a protective film (not shown) may be attached to the surface of the composite laminated film 1a in Fig. 3 (a).

In the preliminary light-guiding module in which the light-shielding printing layer 11 is formed, one side left without forming a cutting slot (not shown) is cut by a known means as described above, A plurality of light-guiding modules 1 having a light-shielding printing layer 11 for preventing light leakage of incident light are formed on the remaining three sides, while the side cutting surface is an incident surface of light from the light source.

Next, the light guide module carrier 20 according to the present invention includes a strip having a flat shape in a strip shape (not designated in FIGS. 3C and 3D) A plurality of cancel keys and menu key pads (not shown) formed parallel to each other at a predetermined interval, a plurality of light guide modules 1 and LEDs (not shown) attached to the plurality of pads, 40 and a closed annular barrier 50.

Then, as shown in FIG. 3 (c), a light-emitting module having a stem in the form of a strip (not designated) and a plurality of pads formed in parallel to each other at a predetermined interval, A step of attaching a plurality of light guide modules 1 as described above to the plurality of pads of the carrier 20 and a step of attaching a plurality of light guide modules 1 for a plurality of aligned keypads The plurality of pads of the light guiding module carrier 20 are aligned and positioned on the flexible PCB 9 and the light guiding layer 11 is formed on each of the plurality of flexible PCBs 9 for keypad And a light-guiding module attaching step of attaching the modules 1 at a time.

In the present invention, the attachment of the light guide module 1 according to the present invention to the keypad part of the mobile device described above can be performed using a double-sided adhesive film (not shown).

5A and 5B are photographs showing on / off states of a general smart phone adopting a touch-type side view keypad method. As an example in which the light-emitting keypad module 30 of the mobile device according to the present invention is applied, It shows the light emitting keypad of the phone.

1: light-guiding module
1a: composite laminating film
2: Light guide film
2a: light-guiding pattern
2b: light guide film unit 2c: protective film
3: Light diffusion film
3a: Light diffusion film unit
4: EMI shielding film
4a: electromagnetic wave shielding film unit
5, 6, 7: substrate sheet 5a, 6a, 7a: protective film
8: Protection and transfer film 9: PCB
10: base plate
11: Shading (printing) layer
11a: bleed-out part < RTI ID = 0.0 >
20: Light guide module carrier
30: Light emitting keypad module according to the present invention
40: LED 50: closed loop barrier
60: (Black) Double-sided adhesive film 70: (Black) (one side) Adhesive film

Claims (10)

A flexible PCB;
An LED mounted on the flexible PCB;
A closed annular barrier attached through a double-sided adhesive film of a black adhesive film for light shielding and made of black high density polyurethane foam;
A light guiding module including a light guiding film having a light guiding pattern formed on a bottom surface thereof and a light diffusion film laminated on the light guiding film, the light guiding module being located at one side of the LED inside the closed annular barrier;
A light-shielding module, a closed loop type barrier, and a one-side adhesive film made of a black adhesive film for light shielding attached to the LED and having a key pattern formed thereon
A light emitting key pad module. The light emitting keypad module according to claim 1, wherein the light guide module has a light-shielding layer formed by printing on three sides of the light guide film and the light diffusion film, except for the light incidence side. delete delete The light emitting keypad module according to claim 1, wherein the light-guiding module includes an electromagnetic wave shielding film laminated on the top surface of the light diffusion film. A method of manufacturing a light emitting keypad module comprising the steps of:
(A) a composite laminated film forming step of laminating a light diffusion film having a pressure-sensitive adhesive layer on the back surface of a light guide film on which a plurality of light guide patterns are formed;
(B) a light guiding module obtaining step of cutting out a plurality of light guiding pattern areas formed on the composite laminated film to take out a plurality of light guiding modules;
(C) a carrier forming step of attaching the plurality of light guiding modules to the light guiding module carrier parallel to each other with a predetermined distance therebetween, and attaching a closed annular barrier made of a black high density polyurethane foam to the outside of each light guiding module;
(D) a double-sided adhesive film adhering step of adhering a double-sided adhesive film made of a black adhesive film for light shielding to the upper surface of the closed annular barrier; And
(E) positioning the light guide module carrier on a plurality of flexible PCBs having a predetermined shape and having LEDs attached thereto, respectively, and then attaching the light guide module and the closed annular barrier to the flexible PCBs for a plurality of keypads And a closed loop type barrier attaching step. 7. The method of claim 6, wherein the closed annular barrier is pre-affixed with the LED on the flexible PCB without adhering to the carrier in the carrier forming step in the step (C). delete The method according to claim 6,
The light guiding module acquisition step (B)
(B1) a step of pre-shaping the light guide module by cutting three sides of the light guide pattern on the composite laminated film to form a cutting slot by simultaneously cutting the periphery of each light guide pattern into 'n' or 'C'
(B2) a light shielding layer forming step of printing the light shielding layer through the cutting slot;
(B3) a light-guiding module obtaining step of cutting out the remaining one side surface of each of the pre-shaped light-guiding modules formed with the light-shielding layer at the same time to take out a plurality of light-guiding modules
A method of manufacturing a light emitting keypad module. 10. The method of claim 9,
The light-shielding layer forming step of (B2)
(B2-1) a base plate laminating step of attaching a base plate having a tacky portion in each region corresponding to each of the preformed light guide module regions;
(B2-2) printing the light-shielding layer on three sides of each of the light guide modules previously shaped by the silk screen printing through the cutting slot,
(B2-3) removing the above-mentioned base plate
A method of manufacturing a light emitting keypad module.
KR1020140031734A 2014-03-18 2014-03-18 Light emitting keypad module and manufacturing method thereof KR101478511B1 (en)

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101580150B1 (en) 2015-03-16 2015-12-24 (주)모던테크 Light emitting keypad module and manufacturing methods thereof
KR101654648B1 (en) * 2015-07-28 2016-09-06 (주)레온 Touch type keypad integrated element and touch sensor
KR20160111087A (en) 2015-03-16 2016-09-26 (주)모던테크 Light emitting keypad module and manufacturing methods thereof

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Publication number Priority date Publication date Assignee Title
KR20080083975A (en) * 2007-03-14 2008-09-19 삼성전자주식회사 Optical waveguide member and key-pad assembly using the same
KR20080088237A (en) * 2007-03-29 2008-10-02 인성전자산업(주) Touch type key button structure of method
KR20120134376A (en) * 2011-06-02 2012-12-12 에쓰이에이치에프코리아 (주) Transparent adhesive unit and touch screen having the same

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20080083975A (en) * 2007-03-14 2008-09-19 삼성전자주식회사 Optical waveguide member and key-pad assembly using the same
KR20080088237A (en) * 2007-03-29 2008-10-02 인성전자산업(주) Touch type key button structure of method
KR20120134376A (en) * 2011-06-02 2012-12-12 에쓰이에이치에프코리아 (주) Transparent adhesive unit and touch screen having the same

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101580150B1 (en) 2015-03-16 2015-12-24 (주)모던테크 Light emitting keypad module and manufacturing methods thereof
KR20160111087A (en) 2015-03-16 2016-09-26 (주)모던테크 Light emitting keypad module and manufacturing methods thereof
KR101654648B1 (en) * 2015-07-28 2016-09-06 (주)레온 Touch type keypad integrated element and touch sensor

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