CN105938398A

CN105938398A - Keyboard construction suitable for built-in touch pad

Info

Publication number: CN105938398A
Application number: CN201610233954.6A
Authority: CN
Inventors: 不公告发明人
Original assignee: Individual
Current assignee: Individual
Priority date: 2016-04-16
Filing date: 2016-04-16
Publication date: 2016-09-14

Abstract

The present invention provides keyboard construction suitable for a built-in touch pad. The keyboard construction comprises a keyboard and a touch pad, and the touch pad is disposed inside the keyboard and positioned below central keys of the keyboard. Conductor wires and electrodes in the structure below the central keys bypass the touch pad position, conductor parts are removed from right above the touch pad, and conductive microparticles or dielectric having larger dielectric constant are added in an insulation structure over the touch pad; or a layer structure formed by dielectric having smaller dielectric constant is added below a conductive membrane around the touch pad. The keyboard construction is used for solving the problem that signals of a built-in capacitance type touch pad in the keyboard are weak, interference is shielded, and the touch pad performance is improved.

Description

A kind of keyboard structure being applicable to built-in touch pad

Technical field

This technology relates to the keyboard on various computer.

Background technology

Keyboard and touch pad are input equipments common on computer, keyboard generally uses membrane structure, including keycap, conducting film, scissor (or volcanic crater), plastic support board, metal profile etc., additionally also have some other structure types, such as mechanical keyboard, not having conducting film and scissor (or volcanic crater), mainly mechanical axis to constitute, mechanical axis is a kind of keyboard mechanical switch.The touch pad of computer is mainly capacitance contact board, its principle is when finger is close to touch pad, and creates electric capacity between touch pad, and the high frequency electric on touch pad can flow through finger, touch pad controller calculates the position of finger according to the change of electric capacity, sense of current and size and is converted into coordinate.Common touch pad, in the outside of keyboard, occurs in that a kind of novel touch pad now, and its structure comparison is special, it is built in the inside of keyboard, in the middle part of keyboard below button, below these 9 buttons of such as TYUGHJBNM, during operation, finger, across keycap, carries out discontiguous suspension procedure to it.Owing to finger does not contacts with touch pad, but across labyrinths such as keycaps, causing the electric capacity between finger and touch pad less, signal is more weak, so the poor-performing of touch pad, it is easy to that interference occurs, in order to solve this problem, need to select high sensitive touch pad control chip, in addition it is also necessary to material is done special handling, after material can be processed by the technical program, in this special keyboard structure.

Summary of the invention

A kind of keyboard structure being applicable to built-in touch pad; including keyboard; touch pad; touch pad is placed in keyboard; in the middle part of keyboard, button is following; conductor wire and electrode in the button structures below of middle part walk around touchpad position, remove conductive component, it is characterized in that in the surface structure of touch pad: add conduction microparticle or the bigger electrolyte of dielectric constant in the insulation system above touch pad；Or increase the Rotating fields being made up of the electrolyte that dielectric constant is less under the conducting film around touch pad.Conductor part refers to the part being made up of conductor; part etc. such as electrode, conductor wire, hard contact or metal material; above touch pad, only retain insulation system, inside above-mentioned insulation system, add conduction microparticle or the bigger electrolyte of dielectric constant.

A kind of keyboard structure being applicable to built-in touch pad, it is characterized in that: the insulation system material above touch pad uses abs plastics or pom plastics or pbt plastics, and abs plastics, pom plastic casing pbt plastics are insulators, and resistivity is the highest, and relative dielectric constant is the lowest, about about 2 ~ 3.

A kind of keyboard structure being applicable to built-in touch pad, is characterized in that: the conduction microparticle added is carbon black materials or metallic particles or conducting polymer microparticle, and the electrolyte that dielectric constant is bigger is macromolecule antistatic material.After adding these materials, relative dielectric constant can be improved.

A kind of it is applicable to the structure of touch pad on keyboard, it is characterized in that: the conductive material quantity of addition is less than marginal value, add material internal with discrete graininess.Add conductive material or macromolecular material at button or scissor or plastic support board, make these insulant become the insulator of high-k.Conductive materials is wanted uniformly, Discrete Distribution, controls the size, and makes these materials keep insulation, and its optimal relative dielectric constant is more than 5, and dielectric constant is the least, and the improvement to performance is limited, and dielectric constant more than 5, effect is preferable.

Dielectric constant, also known as dielectric constant or relative permitivity, is to characterize electrolyte or a significant data of insulant electrical property, and conventional ε represents.It refers in same capacitor with the ratio that same substance is electric capacity when electrolyte and vacuum, represents that electrolyte stores the relative ability of electrostatic energy in the electric field.Between capacitor plate, add the electrolyte of differing dielectric constant, the electric capacity of capacitor will positive change, i.e. dielectric constant big, then electric capacity increases, otherwise, then electric capacity reduces.

Accompanying drawing explanation

Fig. 1 keyboard exterior view

1 button adding white carbon black

Fig. 2 keyboard structural representation

1 touch pad

2 dielectric layers

Embodiment keyboard structure from top to bottom includes: keycap, scissor, plastic support board, conducting film, metal profile, drain pan.Touch pad is rectangle, hollow out according to the shape of touch pad at conducting film corresponding to TYUGHJBNM9 key position and metal profile, the size in hole is more slightly larger than touch pad, as shown in Figure 2, touch pad 1 is placed in hole, and the metal conductive wire on conducting film is tried one's best around the position of perforate, at conducting film near the edge in hole, add the insulating barrier 2 that an abs material is constituted, to completely cut off the conducting film impact on touch pad.Abs plastics are the materials of the low conductivity constant of high resistance, can effectively alleviate false triggering phenomenon.

Plastic support board and keycap use abs plastics, are uniformly added into white carbon black microparticle so that abs plastics keep good insulation, the relative dielectric constant of material to be about 5.Controlling white carbon black quantity, when quantity is improper, electrical property does not complys with requirement.Amounts of particles adds too many, can become conduction abs, make touch pad to work, and the mechanical performance of abs material also can affect adversely simultaneously；Adding very few, the improvement to performance is limited.

After being packed into carbon black particle, the electric conductivity of abs material is the conductivity percolation network decision constituted that interacted by carbon black particle, i.e. conducting particles spacing distance determine, to a certain extent diafiltration probability along with in polymer the increase of content of carbon black, average interparticle distance progressively reduce.Once white carbon black average interparticle distance equal to or less than diafiltration point average interparticle distance, carbon black particle then has conducting dependency, carbon black conductive Percolation Network is formed, system starts conduction, the specific insulation showing as abs masterbatch can be when content of carbon black reaches a certain marginal value, suddenly several orders of magnitude, minimum white carbon black requirement when this marginal value is exactly to form continuous conduction network or chain structure are declined.According to the electric conductivity of carbon black materials itself, it is segmented into low low electric conductivity, middle electric conductivity and high conductivity.In the present embodiment, types of carbon black is high connductivity white carbon black, and white carbon black quantity should be less than marginal value, it is to avoid form electrically conductive links network, keeps the state of insulation of plastics.

Claims

1. the keyboard structure being applicable to built-in touch pad; including keyboard; touch pad; touch pad is placed in keyboard; in the middle part of keyboard, button is following; conductor wire and electrode in the button structures below of middle part walk around touchpad position, remove conductor part in the surface of touch pad, it is characterized in that: add conduction microparticle or the bigger electrolyte of dielectric constant in the insulation system above touch pad；Or increase the Rotating fields being made up of the electrolyte that dielectric constant is less under the conducting film around touch pad.

2. it is applicable to a keyboard structure for built-in touch pad, it is characterized in that: the insulation system material above touch pad uses abs plastics or pom plastics or pbt plastics.

3. it is applicable to a keyboard structure for built-in touch pad, it is characterized in that: the conduction microparticle added is carbon black materials or metallic particles or conducting polymer microparticle, and the electrolyte that dielectric constant is bigger is macromolecule antistatic material.

4. it is applicable to a keyboard structure for built-in touch pad, it is characterized in that: the conduction microparticle of addition is less than marginal value.