JPH077028U - Pushbutton switch with liquid crystal display - Google Patents

Abstract

(57) [Abstract] [Purpose] The board 35 on which the IC chip 38 disposed in the button 49 is mounted is made common, and the presence or absence of the signal LED 34 and the backlight LED 33 on the surface of the button 49,
Furthermore, a push button switch with a liquid crystal display that can accommodate the size of the button 49 and the like is provided. A liquid crystal plate 48 and a flexible printed wiring board 30 on which a circuit pattern is formed are arranged in a button 49, and a circuit pattern is formed on the flexible printed wiring board 30 to mount an IC chip 38 on a substrate 35.
Is mounted and electrically connected by an interconnector 47 between the circuit pattern of either the flexible printed wiring board 30 or the substrate 35 and the lower surface of the liquid crystal plate 48, and the backlight LED 33 is provided below the liquid crystal plate 48. It is arranged.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a push-button switch with a liquid crystal display, and in particular, aims to standardize a substrate on which an IC chip is mounted, and to cope with the presence or absence of signal LEDs and backlight LEDs on the surface of the button, and the size of the button. A pushbutton switch with a liquid crystal display that can be used.

[0002]

[Prior art]

 Conventionally, in this type of switch, as shown in FIG. 7, for example, a display window is provided on the upper surface of the button and a liquid crystal plate is provided. A holder 6 is provided below the liquid crystal plate and a circuit is provided on the lower surface thereof. A printed circuit board 1 having a plurality of holes for forming a pattern 2 and for arranging a backlight LED and a signal LED, and further having an IC 4 mounted at a substantially central portion is arranged. Rectangular holes 9 are provided in the front and rear of the upper surface of the holder 6 to insert an interconnector, and both ends thereof are brought into contact with the lower surface of the liquid crystal plate and the circuit pattern 2 of the printed circuit board 1 to electrically connect them. The backlight LEDs 12 and the signal LEDs 13 at the four corners are arranged on the left and right of the holder 6, and are soldered and fixed to the circuit pattern 2 of the printed board 1. The circuit pattern 2 on the printed circuit board 1 is guided to the lower surface of the printed circuit board 1 by a through hole and connected to the connection pattern 17 provided at one end of the flexible printed wiring board 14 by soldering. The end is inserted into a connector provided on the switch body to be electrically connected.

[0003]

[Problems to be solved by the device]

 However, in the conventional switch described above, several types of printed circuit boards 1 on which expensive ICs 4 are mounted have to be prepared because of the presence or absence of the signal LEDs 13 and the arrangement thereof. The IC4 generally has a cost advantage when it is mass-produced, and the setup has to be changed depending on the type of similar parts, which is disadvantageous in that it becomes expensive. In addition, in mass production, inventory management and performance management from the environment must be fully managed, and there was a demand for standardization of parts due to various problems. Further, when the signal LED 13 is unnecessary, the printed circuit board 1 on which the IC 4 is mounted and the circuit pattern of the LED 12 for the backlight and the signal LED 13 are commonly used, not only the button becomes large but also the frame portion of the button is wide. There was a design flaw that it became. The present invention eliminates the above problems and provides a common printed circuit board 1 having an IC 4 mounted thereon, and provides a push button switch with a liquid crystal display device capable of supporting the presence or absence of a signal LED 13 and various button sizes. To aim.

[0004]

[Means for Solving the Problems]

 The present invention provides a switch body provided with a contact mechanism section and a switch provided with an operation section for displaying on the surface of a button, in which a liquid crystal plate and a flexible printed wiring board having a circuit pattern are provided in the button. A circuit pattern is formed on the flexible printed wiring board, and a board on which an IC chip is mounted is placed on the flexible printed wiring board. An interconnector is provided between the circuit pattern of either the flexible printed wiring board or the board and the lower surface of the liquid crystal board. Is provided and electrically connected, and a backlight LED is provided below the liquid crystal plate.

[0005]

[Action]

 According to the present invention, a flexible printed wiring board in which a backlight LED, a signal LED, and the like are arranged according to the purpose is used, and a board on which an IC chip is mounted is arranged at a substantially central portion on the flexible printed wiring board. , An interconnector is placed between the circuit pattern of either the flexible printed wiring board or the board and the lower surface of the liquid crystal board for electrical connection.

[0006]

【Example】

 Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1 is an exploded perspective view of a first embodiment of the present invention, FIG. 2 is a sectional view of an essential part of the first embodiment of the present invention, and FIG. 3 is a plan view of an essential part of the first embodiment of the present invention. 1 is a perspective view of a flexible printed wiring board according to a first embodiment of the present invention. In these figures, a rectangular and transparent display window is provided on the upper surface of a box-shaped button 49 to form a liquid crystal display section 50, and a liquid crystal plate 48 is disposed inside the button 49 and in contact with the display window. Below the liquid crystal plate 48, a holder 39 having a recess 41 in the center of the upper surface, a LED insertion hole 44 for the backlight, and a signal LED insertion hole 45 on the left and right is provided, and a circuit pattern is provided on the lower surface thereof. Substrate 35, on which 36 is formed and IC chip 38 is mounted, is arranged at the substantially central portion. The substrate 35 is a generally-known printed circuit board made of phenol, epoxy resin, or the like, or is formed in a film shape of polyethylene, polyimide, or the like. A rectangular hole 43 is formed along the inside of the side wall 40 before and after forming the recess 41 of the holder 39, and the interconnector 47 is inserted therein. Both ends of the interconnector 47 are brought into contact with the lower surface of the liquid crystal plate 48 and the circuit pattern 36 of the substrate 35 to be electrically connected. On the lower surface of the substrate 35, a circuit pattern (not shown) connected to the connection pattern 37 on the upper surface by a through hole is formed.

In the embodiment shown in FIGS. 1 to 3, a backlight is provided, and the liquid crystal display section 50 displays the connection pattern 32 formed in the substantially central portion of the flexible printed wiring board 30. A substrate 35 on which an IC chip 38 for controlling characters, characters, symbols, etc. is mounted, and backlight LEDs 33 and signal LEDs 34 are disposed on the left and right sides of the substrate 35. And the signal LED insertion hole 45, respectively. A diffuser plate 46 is provided in the recess of the holder to diffuse the light of the backlight LEDs 33 disposed on the left and right to uniformly illuminate the liquid crystal display unit 50. Then, the signal illuminating section 51 is formed in the frame portion around the liquid crystal display section 50 on the upper surface of the button 49 corresponding to the signal LED 45. Various shapes and positions of the signal illuminating section 51 can be considered depending on the design and purpose of the device. Further, the signal LED 34 is not limited to single color light emission such as red and green, but may be two color light emission such as red and yellow, and many identification displays are possible. Further, the signal lighting section 51 is effective not only for lighting but also for blinking light emission to improve visibility and notify an emergency.

The flexible printed wiring board 30 has a through hole 31 for loosely fitting a cylindrical portion 19 protruding below a plunger 25, which will be described later, and the button 49 has a liquid crystal plate 48 to a substrate 35. The flexible printed wiring board 30 connected to the housing is housed, and the plunger 25 formed of the cylinder plate 19 and the mouth plate 26 provided with the protrusion 28 on the side surface is fitted into the square hole 52 provided on the side surface of the button 49 due to the concavo-convex relationship. Then, the liquid crystal display device is constructed. A recess 27 is provided on the upper surface of the food board 26, which serves as an escape area for the solder and the like protruding on the lower surface of the flexible printed wiring board 30, and the lower surface of the holder 39 and the upper surface of the food board 26. The flexible printed wiring board 30 is sandwiched around the. The flexible printed wiring board 30 projects from one end of the user's board 26, and the through hole 31 provided in the flexible printed wiring board 30 is inserted into the cylindrical portion 29. A hole 19 for accommodating the connector 20 is provided on one side of the switch body 18, and one end of the flexible printed wiring board 30 described above is inserted into the connector 20. Is provided and the switch terminal 24 is projected on the lower surface. Furthermore, the operating shaft 22 for driving the contacts of the contact mechanism portion is housed in the switch body 18, and the cylindrical portion 29 protruding below the plunger 25 and the operating shaft 22 are in a concavo-convex relationship so that an operating force can be transmitted. Are connected by. With the above configuration, electric power is supplied from the connector terminal 21 to the substrate 35 via the flexible printed wiring board 30, and further the liquid crystal board 48 via the IC chip 38, the backlight LED 33, the signal LED 34 and the interconnector 47. Power is supplied to.

FIG. 4 is a perspective view of a flexible printed wiring board. FIG. 4A shows a backlight LED 33 and a signal LED 34, and a substrate 35 on which an IC chip 38 is mounted on a flexible printed wiring board 330. The backlight LEDs 33 are made to face each other with the space described above, and the signal LEDs 34 are arranged in front of and behind them. A connection pattern 32 for connecting the connection pattern 37 of the substrate 35 having the IC chip 38 mounted thereon and the circuit pattern of the flexible printed wiring board 30 is provided between the backlight LEDs 33 facing each other. Connected by bonding. In (B), only the LED 63 for the backlight is arranged, and the width of the flexible printed wiring board 60 is narrowed by the space for arranging the signal LED. In (C), the backlight LED and the signal LED are not provided, but the substrate on which the IC chip is mounted is provided on the flexible printed wiring board. The through hole provided in the flexible printed wiring board is inserted into the cylindrical portion of the plunger. As described above, LEDs are arranged on the flexible printed wiring board depending on the presence or absence of a backlight or a signal illuminating section, and various dedicated flexible printed wiring boards are prepared depending on the position of the signal LED, depending on the purpose. You can use one.

FIG. 5 is a perspective view of an essential part of a second embodiment of the present invention. A double-sided flexible printed wiring board 80 is provided with a substrate 85 on which an IC chip 86 is mounted, and a flexible printed wiring board 80 is provided. One end of the flexible printed wiring board 80 is disposed on the upper surface of the substrate 85 by projecting and bending the one end, and the backlight LED 83 is disposed on the upper surface of the flexible printed wiring board 80. In such a structure, the space located on the lower surface of the liquid crystal plate can be effectively utilized, and a plurality of LEDs can be arranged on the flexible printed wiring board 80 to increase the illuminance on the liquid crystal plate. is there. A signal LED 84 is provided on the flexible printed wiring board 80 before and after the board 85 on which the IC chip 86 is mounted. The bent portion 82 can be provided at the front and rear ends of the flexible printed wiring board or by cutting and bending, and various shapes and methods can be considered.

FIG. 6 is a perspective view of an essential part of a third embodiment of the present invention. The board 90 on which the IC chip 93 is mounted is placed on the flexible printed wiring board 94, and the circuit pattern 91 of the board 90 and the circuit pattern 96 of the flexible printed wiring board 94 are connected. The circuit patterns 96 of the flexible wiring board 94 are connected at the same pitch as the circuit patterns 91 of the substrate 90, and the circuit patterns 96 are extended and widened to be formed on both ends of the substrate 90. Therefore, even if the number of dots on the liquid crystal plate is the same, it is possible to correspond to a liquid crystal plate having a larger dot size or pitch, and an interconnector is provided between the lower surface of the liquid crystal plate and the circuit pattern 96 having a large pitch provided on the flexible printed wiring board 94. By bringing the end faces into contact with each other, the liquid crystal display unit can be enlarged. Reference numeral 95 is a through hole 95 into which the cylindrical portion of the plunger is loosely fitted. Although the backlight LED is not provided in the third embodiment of the present invention, it is possible to provide the backlight LED and the signal LED as in the first embodiment. The backlight LED not only emits a single color but also emits multiple colors. By simultaneously emitting the opposite LEDs in different colors, a backlight of a composite color can be obtained. Can be selected. A cold cathode discharge tube is generally used for the white mode backlight, but it cannot be directly lit at a low DC voltage and must be pulsed using an inverter, which requires a large space in the device. There is a drawback that becomes. . However, the simultaneous emission of different colors of LEDs makes it possible to emit white light in a mixed color by making the wavelengths of respective colors almost complementary colors or a combination close to them. For example, by combining red and blue-green or yellow and blue, white light emission is obtained, and characters and symbols are clear and easy to see. The present invention is not limited to the above-described embodiments, and various modifications can be made within the scope of the present invention, and these modifications are not excluded from the scope of the present invention.

[0012]

[Effect of device]

 As described in detail above, according to the present invention, the following effects can be obtained. (1) Since the board on which the IC chip is mounted is mounted on the flexible printed wiring board on which the backlight LED, the signal LED, etc. are mounted, it is possible to standardize the board on which the expensive IC chip is mounted. Therefore, a push button switch with a liquid crystal display device can be obtained, which can be applied in various ways such as the presence or absence of a signal LED and a backlight depending on the type of flexible printed circuit board. (2) Conventionally, since the backlight LED and the signal LED are arranged on the board on which the IC chip is mounted, it is necessary to select a board on which various IC chips are mounted depending on the presence or absence of these LEDs and the size of the board. Although it was prepared, the commonality of the board on which the IC chip is mounted will result in extremely good productivity and inventory efficiency. (3) Since the backlight LED and the signal LED are arranged on the flexible printed wiring board, it is possible to easily emit light of various colors and use not only the polarity conversion type two-color emission LED but also the three-terminal type. It is possible to use LEDs, and it is possible to easily support the three-color emission of the backlight. (4) By forming a circuit pattern with a large pitch on the flexible printed wiring board, the board on which the IC chip is mounted is commonly used, and the liquid crystal display section is formed by using a liquid crystal board with a large dot pitch and size. Can be large. Therefore, it is not necessary to prepare a substrate on which an IC chip that matches the size of the liquid crystal display section is prepared, and productivity and inventory efficiency are extremely good. A substrate on which an expensive IC chip is mounted can be used for a wide range of applications. it can.

[Brief description of drawings]

FIG. 1 is an exploded perspective view showing a first embodiment of the present invention.

FIG. 2 is a cross-sectional view of an essential part of the first embodiment of the present invention.

FIG. 3 is a plan view of an essential part of the first embodiment of the present invention.

FIG. 4 is a perspective view of a flexible printed wiring board according to a first embodiment of the present invention.

FIG. 5 is a perspective view of an essential part showing a second embodiment of the present invention.

FIG. 6 is a perspective view showing a main part of a third embodiment of the present invention.

FIG. 7 is an exploded perspective view of a conventional main part.

[Explanation of symbols]

 18 Switch Main Body 20 Connector 22 Actuator 25 Plunger 26 Oscillator Board 28 Convex 29 Cylindrical Part 30 Flexible Printed Wiring Board 31 Through Hole 32 Connection Pattern 33 Backlight LED 34 Signal LED 35 Board 36 Circuit Pattern 37 Connection Pattern 38 IC Chip 39 Holder 40 Side wall 41 Recess 43 Rectangular hole 44 Backlight LED insertion hole 45 Signal LED insertion hole 46 Diffusion plate 47 Interconnector 48 Liquid crystal plate 49 Button 50 Liquid crystal display section

Claims (4)

[Scope of utility model registration request] 1. A switch main body provided with a contact mechanism section and a switch provided with an operation section for displaying on a surface of a button, wherein a flexible printed wiring board having a liquid crystal plate and a circuit pattern formed therein is provided in the button. A circuit pattern is formed on the flexible printed wiring board, a substrate on which an IC chip is mounted is placed, and an interconnector is provided between the circuit pattern of either the flexible printed wiring board or the substrate and the lower surface of the liquid crystal plate. A push button switch with a liquid crystal display device, wherein the push button switch is arranged and electrically connected, and further, a backlight LED is arranged below the liquid crystal plate. 2. The flexible printed wiring board is bent and disposed on the upper surface of the substrate, and the backlight LED is disposed on the upper surface of the flexible printed wiring board. Pushbutton switch with liquid crystal display device according to 1. 3. The signal LED is arranged on the flexible printed wiring board around the substrate placed on the flexible printed wiring board.
Pushbutton switch with liquid crystal display device described. 4. The circuit pattern of the flexible printed wiring board connected to the circuit pattern of the substrate is extended,
2. The push button switch with a liquid crystal display device according to claim 1, wherein the push button switch is formed to have a pitch larger than a circuit pattern of the substrate.