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47results about How to "Improve the pressing feel" patented technology

Resilient actuator and dome sheet, keyswitch and keyboard with resilient actuator

The invention relates to a resilient actuator and a dome sheet, a keyswitch and a keyboard with the resilient actuator. In a preferred concrete embodiment, the resilient actuator contains an elastomer, a platform, a raised column and an actuation column. The platform is formed on the top of the elastomer and is provided with a first top end. The raised column is formed at the central position of the top of the elastomer and is equipped with a second top end. The second top end is higher than the first top end. The actuation column is formed in the elastomer. According to the resilient actuator and the dome sheet, the keyswitch and the keyboard with the resilient actuator, the resilient actuator is provided with the raised column, a raised body or a ring-like body, the top of which is higher than the top of the platform. Thus, the resilient actuator provided by the invention has a structure of increasing peak stroke. In comparison with the prior art, force-stroke characteristic and peak stroke are both raised, and then pressing handfeel of the keyswitch provided with the resilient actuator is improved.
Owner:DARFON ELECTRONICS (SUZHOU) CO LTD +1

Key switch with press sound making function

PendingCN108231467AImprove experienceRealize the function of pressing and soundingElectric switchesTactile feedbackInterior spaceEngineering
The invention discloses a key switch with a press sound making function. The key switch comprises a base and a cover arranged above the base, wherein the cover and the base are combined to form an accommodating cavity; a guide core and an elastic element located below the guide core are arranged in the accommodating cavity; the key switch also comprises a sound making assembly arranged in the accommodating cavity and located at the lower end of the guide core; the sound making assembly comprises a driving piece, a driven block as well as a driven piece connected between the driving piece and the driven block; at least one first knocking block is arranged on the driven block; at least one second knocking block corresponding to the at least one first knocking block is arranged in the accommodating cavity. The key switch with the press sound making function can fully utilize the inner space, touches good during pressing and realizes the press sound pressing function while the key switch is as small as possible, the user experience is improved, the action accuracy is high in the whole process, the structural stability is high, and sound making sensitivity and accuracy are high.
Owner:DONGGUAN CITY KAIHUA ELECTRONICS

Key and mobile terminal therewith

The invention discloses a key and a mobile terminal therewith. The key comprises at least one pressing part, at least one dome array, a circuit board and an insulating blanket, wherein the dome array is disposed between the circuit board and the insulating blanket. Projection portions with the number the same as that of the dome array are arranged on the insulating blanket, and each projection portion is positioned in a place corresponding to the center of the dome array. The mobile terminal comprises the key mentioned above. With the use of the key and the mobile terminal, pressing feelings the key brings can be well improved, misuse is reduced, and key failure can be effectively avoided.
Owner:HUAQIN TECH CO LTD

High-speed connector module with key structure

A high-speed connector module with a key structure comprises a module shell, a connector main body, a metal hook and a press key, wherein the connector main body is arranged in the module shell, the metal hook is arranged in the connector main body, the press key is arranged on the module shell and comprises a press key main body, an elastic sheet and assembly grooves, the elastic sheet is arranged on a lower end surface of the press key main body, the assembly grooves are arranged at two ends of the press key main body, pull structures are arranged on the metal hook and are connected with the assembly grooves of the press key in a matching way, the elastic sheet is upwards compressed on the connector main body after the press key is arranged on the module shell, an elastic force of the elastic sheet drives the press key to face upwards by pressing the press key, and the pull structures in installation grooves at the two ends of the press key are further driven to move upwards so as to pull the metal hook. With the high-speed connector module disclosed by the technical scheme, higher reliability is achieved through a design that the metal hook is pulled and reset by the elastic sheet arranged in the press key, the service lifetime of a product is prolonged on the premise of no extra cost increasing, and meanwhile, the press handfeel of the product is enhanced.
Owner:AMPHENOL ELECTRONICS ASSEMBLY XIAMEN CO LTD

Press key structure

The invention discloses a press key structure comprising a key cap, a rigid circuit board, at least one coupling member, a micro-switch and a support unit, wherein the key cap is provided with at least one connecting part, the rigid circuit board has an accommodating space, the at least one coupling member is arranged on the rigid circuit board and projects toward the key cap, the micro-switch is positioned below the key cap and is partially accommodated in the accommodating space, the micro-switch is electrically connected to the rigid circuit board, the support unit is coupled to the at least one connecting part and the at least one coupling member, and therefore the key cap can be supported to move relative to the rigid circuit board to trigger the micro-switch. According to the press key structure, through arrangement of the micro-switch, comfortable pressing touch can be realized, the micro-switch is integrated with the rigid circuit board which provides a needed electric path, and therefore feasibility and convenience of individual press key maintenance can be improved. According to the press key structure, the coupling member is integrated with the rigid circuit board, the circuit board is enabled to have a function of a coupling key cap or the supporting unit, no extra base plate is needed, and the number of elements of the press key structure is reduced.
Owner:DARFON ELECTRONICS (SUZHOU) CO LTD +1

Key switch with pressing balance function

PendingCN108766797AButton force balanceImprove pressing balanceKey modulesContact operating partsElastomerKey pressing
The invention discloses a key switch with a pressing balance function. The key switch comprises a base, a key cap arranged above the base and a pressing balance assembly arranged between the base andthe key cap, wherein the pressing balance assembly comprises a balance rack A connected between the base and the key cap, a balance rack B connected between the base and the key cap and an elastomer connected between the balance rack A and the balance rack B. The key switch provided by the invention has good pressing balance and stability, the pressing stroke is obviously increased, and the pressing hand feeling is improved.
Owner:DONGGUAN CITY KAIHUA ELECTRONICS

Mobile phone press key light guide plate with metal clips and its manufacturing technique

The invention provides a mobile phone keyboard light guide plate with a metal spring piece, which comprises a plate body. The back of the plate body is printed with light guide points which are cylindrical protrusions made of light guide printing ink. The light guide plate is characterized in that the back of the body of the light guide plate is adhered with the metal spring piece; and the metal spring piece is adhered with the body through water-gel printing ink printed on the outer layer of the light guide points. The body of the light guide plate is a PU plate or a PC plate. The metal spring piece is in a circular shape. The invention also provides a process for producing the mobile phone keyboard light guide plate with the metal spring piece. A PET layer between the light guide plate and the metal spring piece is not required, so the overall thickness of the light guide plate is reduced, the contact between the keyboard and the spring piece is more direct, and the hand feels of pressing between the keyboard and the spring piece are improved. Moreover, the light guide plate is suitable for making thinner mobile phones and meets the market demands.
Owner:JIAXING SHUNON ELECTRONICS TECH

Long-stroke water-proof microswitch

The invention relates to a microswitch. The microswitch comprises an outer shell, a first terminal set, a button transmission mechanism, an elastic piece transmission mechanism and a second terminal set, wherein the first terminal set, the button transmission mechanism, the elastic piece transmission mechanism and the second terminal set are arranged inside the outer shell. The elastic piece transmission mechanism and the second terminal set are packaged in a water-proof shell which is located in the outer shell. A button is pressed, a pressing action is transmitted to the elastic piece transmission mechanism through a transmission component so that a terminal connection relation in the second terminal set can change, and the terminal connection relation in the first terminal set changes to achieve electrical connection control of an external circuit finally. According to the water-proof microswitch, water-proof processing is conducted in the microswitch, it can be effectively prevented that a water-proof component is corroded by the environment to reduce the water-proof performance, and service life of the microswitch is prolonged; the elastic piece transmission mechanism, the second terminal set and the water-proof shell constitute a sub-microswitch which can be an existing long-stroke water-proof microswitch entirely, the technique is mature, the technology is stable, production is convenient, and water-proof and water-proof protecting effects are achieved.
Owner:HUIZHOU TRANTEK ELECTRONICS

Shell assembly and watch

The invention discloses a shell assembly and a watch. The shell assembly comprises a shell on which a through hole is formed; a prop which is arranged in the through hole and can axially slide, one end of the prop, which is located at an outer side of the shell, being equipped with a key cap, and one end located at an inner side of the shell being used for controlling a key switch arranged in theshell; a biasing member of which biasing force acts on the key cap so as to enable the key cap to be reset after external force pressing; and a sealing member arranged between the prop and the throughhole. The shell assembly provided by the invention is low in manufacturing cost, the generation of microcracks at the shell is completely eradicated, the assembly efficiency and yield are relativelyhigh, and hand feeling of pressing is relatively good.
Owner:YULONG COMPUTER TELECOMM SCI (SHENZHEN) CO LTD

Keyboard with hollowed keys and elastic silicone gel bodies

The invention relates to a keyboard with hollowed keys and elastic silicone gel bodies. The keyboard is composed of an integrated key assembly, a key square bracket, a printed circuit film under the integrated key assembly, the elastic silicone gel bodies which are fixed on printed circuit film switches, and a keyboard chassis which supports the printed circuit film from below; according to the integrated key assembly, a plurality of hard plastic key surfaces and a plurality of soft plastic connecting bodies are molded into a plurality of cap type structures through two-step hard plastic and soft plastic injection molding; a soft plastic flat surface layer and a soft plastic side surface layer are molded into the soft plastic connecting bodies through one-step soft plastic injection molding; and the soft plastic side surface layer is of a hollowed structure and is composed of at least three soft plastic support connecting portions which are arranged at intervals to form a planar structure and hollowed portions which are arranged between the soft plastic support connecting portions. With the above structure adopted, the keyboard of the invention has the advantages of high elasticity, high light transmittance, excellent heat dissipation performance, low cost, simple assembly and good pressing hand feel.
Owner:江海波

Key switch having good balance

The invention discloses a key switch having good balance. The key switch having the good balance comprises a base seat and a cap covering the base seat, and further comprises a guide core, a torsional spring, a conducting component and a guide core sliding block, which are respectively arranged on the base seat, wherein a guiding pillar is arranged at the central position of the upper end of the base seat in upward protruded mode, a guiding hole is formed downwards in the center of the guiding pillar, two baffles are respectively arranged at the upper end of the base seat and located on two opposite side edges of the guiding pillar so as to form an annular containing groove which surrounds the baffles and the guiding pillar, an annular insertion groove is formed in the lower end of the guide core, an insertion pillar is arranged in the middle of the annular insertion groove in downward protruded mode, the insertion pillar is inserted into the guiding hole in the base seat so as to insert the guiding pillar into the annular insertion groove, springs sleeve the outer sides of the guiding pillar and the insertion pillar, a balancing pole component mainly formed by intersecting a first balancing pole with a second balancing pole is arranged in the annular containing groove, and positions of two opposite intersections of the first balancing pole and the second balancing pole are respectively limited by positioning sliding blocks. The key switch having the good balance significantly improves pressing balance and pressing stability.
Owner:DONGGUAN CITY KAIHUA ELECTRONICS

Mobile phone and key structure thereof

ActiveCN105405696ADoes not reduce the pressing feelLow costElectric switchesEmergency springsEngineeringMechanical engineering
The invention provides a mobile phone and a key structure thereof. The key structure is used for pressing a switch eccentrically arranged below the key structure. The key structure includes a pressing bearing stage, a pressing part which is connected with the first side of the pressing bearing stage and extends downwards to correspond to the switch, a fixing part which is arranged at the second side of the pressing bearing stage which is opposite to the first side; a pressing gap is left between the pressing part and the switch; the fixing part is connected with the pressing bearing stage through one elastic arm; the pressing part has a first state in which the pressing part contacts with the switch and a second state in which the pressing part is separated from the switch; and the elastic arm enables the pressing part to recover the second state from the first state. The key structure is used for pressing the eccentrically-arranged switch. The key structure has the advantages of simplicity, simple production process, reduced cost and enhanced applicability.
Owner:厦门鸾创科技有限公司

Four-way adjusting switch of electric seat

The invention discloses a four-way adjusting switch of an electric seat. The four-way adjusting switch comprises a shell, a PCB assembly and a toggle button, a toggle switch assembly is installed on the PCB assembly, and the toggle switch assembly comprises a fixed seat installed on the PCB assembly and four rotating blocks which are arranged in the fixed seat and can swing up and down. Conductiverubber is arranged on a circuit control board assembly and located below the fixed seat, and a conductive rubber column matched with the rotating blocks is arranged on the portion, located below therotating blocks, of the conductive rubber. A rotating frame is installed in the fixed seat and located above the rotating blocks, a shifting rod is further installed in the rotating frame, the rotating direction of the shifting rod is perpendicular to the rotating direction of the rotating frame, and the upper portion of the shifting rod is installed on a shifting button. The four-way adjusting switch is few in parts, easy to assemble and low in part machining difficulty, manual welding is not needed, production quality control is facilitated, and the touch comfort of automobile operation is improved due to the flexible touch feeling of rubber.
Owner:HUANGSHAN AOTESI ELECTRICAL CO LTD

Rocker potentiometer with adjustable resilience force

The invention provides a rocker potentiometer with adjustable resilience force. Comprising a base, a first spring arranged at the bottom of the inner side of the base, a supporting seat located on the upper side of the first spring, a lower rocker arm located on the upper side of the supporting seat and swinging in the x-axis direction, an upper rocker arm located on the upper side of the lower rocker arm and swinging in the y-axis direction, and a variable resistance output module connected to one end of the upper rocker arm and / or one end of the lower rocker arm. The lower end of the handle is located on the inner sides of the lower rocker arm and the upper rocker arm, the upper cover is arranged on the upper side of the base in a sleeving mode, and the lower end of the handle is rotationally connected with the lower rocker arm. According to the rocker potentiometer, the conductive coil is additionally arranged on the inner side or the outer side of the spring, the permanent magnet is additionally arranged at the bottom of the supporting seat, the magnetic field is generated after the conductive coil is electrified, the supporting seat is forced to have upward thrust under the action of repulsive force of the magnetic field, and the rocker can be kept in the middle after resetting.
Owner:东莞福哥电子有限公司

A key switch with the function of pressing and producing sound

InactiveCN109065394AImprove experienceRealize the function of pressing and soundingElectronic switchingElectric switchesKey pressingEngineering
The invention discloses a key switch with the function of pressing and producing sound, including a base, and a cover arranged above the base, The cover and the base are combined to form a receiving cavity, A lead core and an elastic member positioned below the guide core are arranged in the contain cavity, and an elastic sounding assembly arranged in the accommodating cavity and located at the side of the guide core is included. At the side edge of the guide core, a side notch is formed, and the elastic sounding assembly includes an upper spring piece passing through the side notch, a firstlower spring piece arranged on the base and connected to one end of the upper spring piece, and a second lower spring piece arranged on the base and connected to the other end of the upper spring piece. The key switch provided by the invention has a good hand feeling in the pressing process, realizes the pressing and sounding function, improves the user experience, and has the advantages of high action accuracy in the whole process, high structural stability, and sensitive and accurate stimulation of the sounding effect.
Owner:DONGGUAN CITY KAIHUA ELECTRONICS

Key switch with press sound production function

PendingCN110504127AImprove experienceSatisfy the higher requirements of the sense of soundElectronic switchingElectric switchesEngineeringSound production
The invention discloses a key switch with a press sound production function. The key switch comprises a base and a cover, wherein the cover is arranged on the base, the cover and the base are combinedto form an accommodating cavity, a guide core and an elastic piece are arranged in the accommodating cavity, the elastic piece is arranged below the guide core, the key switch also comprises an elastic sound production assembly, the elastic sound production assembly is arranged in the accommodating cavity and is arranged at a side edge of the guide core, a side groove opening is formed in the side edge of the guide core, the elastic sound production assembly comprises an upper elastic piece, a first lower elastic piece and a second lower elastic piece, the upper elastic piece penetrates through the side groove opening, the first lower elastic piece is arranged on the base and is connected to one end of the upper elastic piece, and the second lower elastic piece is arranged on the base andis connected to the other end of the upper elastic piece. In the key switch provided by the invention, favorable hand feeling is achieved during the press process, the sound production function by pressing for two times is achieved, the user experience is enhanced, the whole process action is high in accuracy, the structure stability is high, and the promotion and sensitivity of a sound production effect are accurate.
Owner:DONGGUAN CITY KAIHUA ELECTRONICS

Push-button key cover and producing method thereof

A push button switch cover capable of enhancing positional accuracy between a cover sheet and dish-shaped metal springs, thereby highly improving keying characteristics and reducing manufacturing cost. The cover sheet is provided on a front surface thereof with key tops and on a rear surface thereof with pressing projections in correspondence to the key tops. The dish-shaped metal springs are each bonded to a respective one of the pressing projections by an elastic adhesive section while keeping an apex of the dish-shaped metal spring abutted against a central portion of the pressing projection.
Owner:SHIN-ETSU POLYMER CO LTD

Photoelectric key switch capable of improving pressing hand feeling

The invention discloses a photoelectric key switch capable of improving pressing hand feeling, which comprises a balancing stand assembly, a light-emitting geminate transistor, a driving block and a key cap, and is characterized in that the balancing stand assembly comprises a base, a first balancing rod movably connected to the base, a second balancing rod movably connected to the base, and an elastic piece connected between the first balancing rod and the second balancing rod; when being pressed downwards, the first balance rod and the second balance rod respectively swing up and down in a balanced manner by taking the base as a supporting point under the elastic pulling action of the elastic piece; the light-emitting pair transistor comprises a light-emitting element and a light-sensitive element, and a light blocking piece used for blocking light between the light-emitting element and the light-sensitive element is arranged on the driving block. According to the photoelectric key switch provided by the invention, stable up-and-down swinging is realized, so that a paragraph feeling, namely a feedback feeling, is given to a human hand while the pressing balance and stability are improved, and therefore, the pressing hand feeling is increased, and the user experience is improved; meanwhile, the switch-on and switch-off actions are high in accuracy, the sensitivity of the key switch is improved, and the service life is long.
Owner:DONGGUAN CITY KAIHUA ELECTRONICS

A thin keyboard switch

A thin keyboard switch, comprising a PCB (1), a base (2) provided on the PCB, and a guiding component (3) and a cover (4), separately provided on the base, and further comprising a guide core component (5), a tension spring (6) and an X-shaped frame (7) all separately provided on the base, the base having provided therein a first accommodating groove (21) and a second accommodating groove (22), the tension spring being clamped in the first accommodating groove, the guide core component and the guiding component both being clamped in the second accommodating groove, and the cover having provided therein an opening (41) allowing a top end of the guide core component to penetrate; a support plate (23) is provided around a perimeter of a top end of the base, the X-shaped frame being provided on the support plate and surrounding an outer perimeter of the base, an end of the tension spring being hooked on the X-shaped frame; a bottom end of the cover is inserted into a gap formed by the X-shaped frame and the base. The thin keyboard switch of the present invention increases balance and stability while making the overall thickness thereof thinner, and also has a good feel when pressed, improving user experience.
Owner:DONGGUAN CITY KAIHUA ELECTRONICS

Mobile phone side key

The invention provides a mobile phone side key. A key slot comprises an outer segment slot and an inner segment slot, and a step is formed at the joint of the outer segment slot and the inner segmentslot. An elastic part is built in the inner segment slot, and the outer end extends into the outer segment slot and is provided with a press part. The outer periphery of the press part is located on the step, and an elastic reset member is arranged between the elastic part and the step. Elastic support legs are arranged on both ends of the elastic part, and an arc-shaped protrusion is arranged onthe outer side of each elastic support leg. Each arc-shaped protrusion and the inner segment slot are in interference fit. Elastic protrusions and conductive bases are arranged on the inner side of the elastic part. A support frame is arranged on the inner side of the side wall of a mobile phone casing. Both ends of the support frame are fixed on the side wall of the mobile phone casing. The support frame is provided with a support column and through holes. The elastic protrusions pass through the through holes. The support frame and the support legs are engaged through clip heads and clip slots. An adhesive layer is arranged between a clip head and a clip slot. According to the invention, the mobile phone side key is easily assembled; linkage is avoided; and the hand feeling of press is improved.
Owner:匀加速科技有限公司

Swing rod switch

The invention discloses a swing rod switch, relates to the technical field of switches, and can reduce the force required for operating a button, can reduce the noise generated by toggling the switch,and can improve the use experience of a user. The swing rod switch comprises: a button; a transmission assembly which is connected with the button; a swing sheet, wherein the first end of the swing sheet is connected with the transmission assembly, the second end of the swing sheet is provided with a movable contact, a connecting part is arranged between the first end and the second end, and thedistance between the connecting part and the movable contact is smaller than the distance between the connecting part and the first end; a first conducting strip, wherein the connecting part which isrotatably connected with the first conducting strip; and a second conducting strip which is provided with a static contact matched with the movable contact. The swing rod switch is used for controlling on-off of a circuit.
Owner:NINGBO BULL ELECTRIC CO LTD

Full-plastic spraying device

The invention discloses a full-plastic spraying device. The full-plastic spraying device comprises a wrench, an environment-friendly cross arm plastic spring, a positioning seat, a nozzle mechanism, a hexagonal plug, a piston mechanism, an environment-friendly plastic upper spring, an environment-friendly plastic lower spring, a plastic ball and a pump body. According to the full-plastic spraying device, the design of a two-section type elastic element is adopted, the upper plastic spring and the lower plastic spring are both made of environment-friendly plastic materials, can replace metal springs well, the pressing hand feeling of the two-section type elastic element is remarkably improved, and in addition to a conventional liquid, the two-section type elastic element is very suitable for the use of a solution which corrodes metal parts easily; and the full-plastic spraying device has the remarkable characteristics of being stable in structure, reasonable in design, good in atomization effect, energy-saving, environment-friendly, long in service life, non-toxic, harmless, convenient to integrally recycle, free of disassembly and classification and the like, so that daily use of people is greatly facilitated, and life health and safety of people in daily use are maintained.
Owner:NINGBO CHENMING SPRAYER

Elastic actuator and dome sheet containing same, key and keyboard

The invention relates to a resilient actuator and a dome sheet, a keyswitch and a keyboard with the resilient actuator. In a preferred concrete embodiment, the resilient actuator contains an elastomer, a platform, a raised column and an actuation column. The platform is formed on the top of the elastomer and is provided with a first top end. The raised column is formed at the central position of the top of the elastomer and is equipped with a second top end. The second top end is higher than the first top end. The actuation column is formed in the elastomer. According to the resilient actuator and the dome sheet, the keyswitch and the keyboard with the resilient actuator, the resilient actuator is provided with the raised column, a raised body or a ring-like body, the top of which is higher than the top of the platform. Thus, the resilient actuator provided by the invention has a structure of increasing peak stroke. In comparison with the prior art, force-stroke characteristic and peak stroke are both raised, and then pressing handfeel of the keyswitch provided with the resilient actuator is improved.
Owner:DARFON ELECTRONICS (SUZHOU) CO LTD +1

A long stroke micro switch

The invention relates to a long-stroke microswitch. The long-stroke microswitch comprises an outer shell, a first terminal set, a second terminal set, a button transmission mechanism, an elastic sheet transmission mechanism connected with the button transmission mechanism and the like, the first terminal set, the second terminal set, the button transmission mechanism, the elastic sheet transmission mechanism and the like are arranged in the outer shell, the button transmission mechanism comprises a first button and a first spring limited between the bottom of the first button and the outer shell, a transverse pressing portion is arranged on the side wall, in the outer shell, of the first button, and the pressing portion is located above the elastic sheet transmission mechanism. The button is pressed, the first spring is deformed, the button transmission mechanism transmits the pressing motion to the elastic sheet transmission mechanism through the pressing portion, then the terminal connecting relation in the second terminal set is changed, the terminal connecting relation in the first terminal set is changed, and finally electrical connection control over an external circuit is achieved. According to the microswitch, dual pressing transmission processing is adopted, the stroke capable of being set is long, the pressing hand feeling is increased, damage caused by improper operations to the microswitch is buffered, resetting is reliable, and the overall cost of the microswitch is low.
Owner:HUIZHOU TRANTEK ELECTRONICS

Electronic equipment key

The invention discloses an electronic equipment key. The electronic equipment key comprises a top board, wherein a through hole is formed in the top board; a key cap is mounted in the through hole; the key cap is glidingly connected with the top board; guiding rods are arranged on two sides of the lower end of the key cap; a guiding frame corresponding to the guiding rods is arranged on the lower part of the top board; a spring sheet is arranged between the lower surface of the key cap and the upper surface of the guiding frame; the upper end of the guiding frame is fixedly connected with the lower surface of the top board; and guiding holes are formed in positions, corresponding to the guiding rods, on the guiding frame. By adoption of the electronic equipment key, the positioning and guiding of the guiding rods can be realized in a pressing process of the key cap through the guiding frame and the guiding holes, so that movable contacts can accurately move in a vertical direction to be in contact with corresponding static contacts; a groove which is the same as each static contact in shape is formed in the bottom of each movable contact, so that the contact area between the movable contact and the corresponding static contact is enlarged; in addition, the electronic equipment key can achieve a best pressing effect; and the top of the key cap adopts prism-free design, so that the pressing feeling is improved.
Owner:GUANGXI UNIV
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