Key module for a keyboard, and keyboard

What is presented is a key module for a keyboard. The key module includes a first wing element and a second wing element for guiding a movement of the key module upon actuation. Each wing element includes a bar, a first arm and a second arm. The arms extend away from the bar. A mounting portion is formed on the bar. A first bearing portion for bearing the wing element is formed on the first arm. A second bearing portion for bearing the wing element is formed on the second arm. The first wing element and the second wing element are mechanically coupleable to each other. The key module also includes at least one spring element for providing a reset force upon actuation of the key module. The at least one spring element is mountable to the mounting portion of the first wing element and the mounting portion of the second wing element. The key module further includes a support element for supporting the wing elements. A plurality of accommodating portions for accommodating the bearing portions of the wing elements are formed in the support element.

TECHNICAL FIELD

The present invention relates to a key module for a keyboard and to a keyboard with at least one such key module.

BACKGROUND

In keyboards, such as ones used in connection with computers, for example, various key systems may be employed.

EP 1 612 821 A2 discloses a key switch, a keyboard and a key-switch assembling jig.

SUMMARY

Against this background, the present invention provides an improved key module for a keyboard and an improved keyboard in accordance with the main claims. Preferred embodiments are defined in the dependent claims and the subsequent description.

According to embodiments of the approach described here, a mechanical system or guiding mechanism comprising a double wing unit and elastic means coupled to the double wing unit may be provided for a key module. The guiding mechanism may be formed to effect equilateral, synchronous and free-of-play or reduced-play guidance or parallel guidance of a top part of the key module. In particular, the double unit and the elastic means, in conjunction with a switch unit, are also configured to provide a reset force with respect to actuation of the key module and a specific force-path characteristic and to make the same adjustable.

Advantageously, a very flat mechanical switch module can be provided, for example for gaming applications, high-end office applications and the like. For example, the switch module may be employed in notebooks and flat keyboards. The force-path characteristic of the key module with respect to actuation may be adjusted by the manufacturer, the customer and additionally or alternatively the user. For example, the key module may allow for customization by the user. The life of the key module may lie in the range of classic mechanical key modules, for example. In addition, key module may support uniform and economical illumination of a keycap or a top part by means of a light source or light source capable of being integrated. For example, such a key module may fulfil requirements concerning very flat construction dimensions, such as block dimensions of 1 to 4 millimeters, particularly of up to about 2 millimeters.

A key module for a keyboard is presented, wherein the key module comprises:

a first wing element and a second wing element for guiding a movement of the key module upon actuation, wherein each wing element comprises a bar, a first arm and a second arm, wherein the arms extend away from the bar, wherein a mounting portion is formed on the bar, wherein a first bearing portion for bearing the wing element is formed on the first arm, wherein a second bearing portion for bearing the wing element is formed on the second arm, wherein the first wing element and the second wing element are mechanically coupleable to each other;

at least one spring element for providing a reset force upon actuation of the key module, wherein the at least one spring element is mountable to the mounting portion of the first wing element and the mounting portion of the second wing element; and

a support element for supporting the wing elements, wherein a plurality of accommodating portions for accommodating the bearing portions of the wing elements are formed in the support element.

The keyboard may be provided for a computer or the like, for example. The keyboard may comprise at least one key module. The key module may be part of a key or may represent a key. Hence, there may be provided one key module per key. The key module may also be referred to as a mechanical pushbutton. The at least one spring element may also be referred to as elastic means. The accommodating portions of the support element may be formed as bearing grooves, notches or the like. In other words, the accommodating portions of the support element may be formed to be groove-shaped, v-shaped and additionally or alternatively swallow-tailed. The support element may be integrally formed.

According to one embodiment, each wing element may comprise coupling portions for mechanically coupling the wing elements to each other. A first coupling portion may be formed at an end of the first arm of each wing element. A second coupling portion may be formed at an end of the second arm of each wing element. Such an embodiment offers the advantage that the wing elements can be coupled to each other easily, with quick and simple mounting also being enabled.

The first coupling portion and the second coupling portion may be formed differently. The first coupling portion of the first wing element may be coupleable to the second coupling portion of the second wing element. The second coupling portion of the first wing element may be coupleable to the first coupling portion of the second wing element. Hence, the first coupling portions may be formed to be complementary to the second coupling portions. Such an embodiment offers the advantage that the wing elements can be coupled to each other securely and reliably. In addition, the wing elements may be formed as same parts.

In particular, the first coupling portion may be formed as a link, and the second coupling portion may be formed as a protruding portion. Alternatively, the first coupling portion and the second coupling portion may be formed as teeth. Such an embodiment offers the advantage that mechanical decoupling can be achieved.

Also, the first wing element and the second wing element may be formed to be identical to each other. Additionally or alternatively, each wing element may be integrally formed. Additionally or alternatively, each wing element may be formed of a metal material. In particular, the wing elements may be blanked or stamped parts and additionally or alternatively same parts. Such an embodiment offers the advantage that manufacturing of the wing elements can be simplified and made cheaper. Furthermore, stability of the wing elements may be increased.

Furthermore, each wing element may comprise at least one connecting portion for connecting the wing element to a top part for the key module. The top part may comprise a keycap or may be coupleable to a keycap. The keycap may represent a part of the key visible to an operator and operable by depressing. Such an embodiment offers the advantage that a simple and secure mechanical connection between the elements and a one-piece top part or two-piece top part or between top part and keycap can be enabled.

The at least one connecting portion may be formed as an elastically deformable beam or as an elastically deformable beam with an end portion bent into a base area region of the bar. Herein, the bent end portion may be arranged between the bar of the wing element and the support element in a mounted state of the key module. Hence, support of the beam against the support element when mounting the top part, and support of the beam against the bar when dismounting the top part may be achieved. Such an embodiment offers the advantage that easy and safe mounting and dismounting of the top part to and from the wing elements can be made possible.

According to an embodiment, the support element may comprise soldering surface is or connector pins for attaching the support element to a circuit substrate of the keyboard. Additionally or alternatively, the support element may be formed of a metal material. Such an embodiment offers the advantage that direct attachment of the key module two a circuit board or the like can be enabled. Furthermore, the support element can be made robust.

Also, the support element may comprise at least one anchoring portion for anchoring a stabilizing bracket for stabilizing a top part for the key module with respect to torsional moments and bending moments. The at least one anchoring portion may be formed as an eye, a lug or the like. Such an embodiment offers the advantage that the stabilizing bracket can be mounted directly to the key module. Thus, an integrated solution for additional stabilization can be realized particularly for oblong keys.

Furthermore, the at least one spring element may be formed as a tension spring or as a compression spring. Such an embodiment offers the advantage that a reset force can be provided in a constructively simple and reliable manner adjustable by exchanging the at least one spring element. In addition, a compression spring may optionally also serve as a bending guide.

Also, there may be provided at least one cam for deforming the at least one spring element in an actuated state of the key module. Herein, the at least one cam may be formed on the support element, on a switch unit and additionally or alternatively on a top part for the key module. The upper part may comprise a keycap or may be coupleable to a keycap. The at least one cam may also be referred to as a protruding element, a tooth, a nose or the like. Such an embodiment offers the advantage that easy deformation of the at least one spring element can be achieved, wherein loss of its linear the formation behavior may lead to higher resistance to actuation force. Thus, a force-path characteristic with respect to actuation of the key module can be influenced advantageously, i.a. by way of a geometry of the at least one cam.

Moreover, the key module may comprise a switch unit. The switch unit may comprise a housing and a contact device partially arranged in the housing for establishing electrical contact upon actuation of the key module. The contact device may comprise a fixed contact piece with a first contact and a contactor with a first spring clip carrying a second contact and additionally or alternatively a second spring clip for producing an actuation sound and additionally or alternatively at least one actuation portion. The contactor may be integrally formed. The contactor may comprise either the first spring clip and at least one actuation portion or the first spring clip, the second spring clip and at least two actuation portions. The at least one actuation portion may be pressed by the top part or an auxiliary actuator. The electrical contact between the first contact and the second contact may be established in one contact point. Each contact may be formed to be elongated and additionally or alternatively may comprise a linear contact area. A contact area of the first contact and a contact area of the second contact may cross each other. Each contact area may extend obliquely with respect to a longitudinal axis of extension of spring clip. The second spring clip may comprise an actuation portion which is angled, bent or curved. The second spring clip may be formed to produce the actuation sound upon rebound against the housing. Such an embodiment offers the advantage that the electrical contact can be established in a reliable manner, wherein the force-path characteristic of actuation can be influenced by suitable design of the contact device. In addition, an actuation sound may optionally be realized in a simple way. The switch unit may enable the functions of both electric contact and acoustic feedback. This can be realized by the integrally formed contactor with the at least one spring clip.

In at least a subsection, the housing may formed of a transparent or opaque material and additionally or alternatively as at least one lens. Additionally or alternatively, the housing may comprise a receiving bay for a light source. Additionally or alternatively, at least one groove for accommodating at least a subsection of the at least one spring element in an actuated state of the key module may be formed in the housing. The at least one groove may also be referred to as a depressed portion, an oblong depression or a notch. The at least one lens may be configured to distribute light from a light source over the top part of the key module and additionally or alternatively over the keycap. The at least one lens may be configured to focus or scatter light. For example, the at least one lens may be an optical diffuser. Such an embodiment offers the advantage that illumination of the key can be achieved in a space-saving manner, and additionally or alternatively space for the key module can be saved due to the at least one spring element at least partially plunging into the groove.

Also, the contact device may comprise soldering areas or connector pins for attaching the switch unit to a circuit substrate of the keyboard. Additionally or alternatively, the contact device may be formed to establish the electric contact while producing friction between the first contact and the second contact. Such an embodiment offers the advantage that contact deterioration due to contamination by particles can be avoided.

Moreover, the key module may comprise a top part. The top part may comprise a keycap or be coupleable to a keycap. Additionally or alternatively, at least one groove for accommodating at least a subsection of the at least one spring element in an actuated state of the key module may be formed in the top part.

Furthermore, the key module may comprise a stabilizing bracket for stabilizing a top part for the key module with respect to torsional moments and bending moments. The stabilizing bracket may be anchored on the support element of the key module.

According to an embodiment, the housing may comprise an actuation opening for exposing the at least one actuation portion of the contact device. Additionally or alternatively, the housing may comprise a deflecting portion for deflecting the second spring dip contact device upon the actuation of the key module. The deflecting portion may formed obliquely inclined relative to the movement of the key module upon the actuation. The deflecting portion may be curved, slightly stepped, formed as a burl or a cam or the like. The deflecting portion may be formed to cause, upon the actuation of the key module, deflection or excursion of the second spring dip transversally or obliquely with respect to the movement of the key module upon the actuation. An angle of inclination of the deflecting portion relative to the movement of the key module upon the actuation may here be smaller than an angle of inclination of an angled or bent actuation portion of the second spring clip. Such an embodiment offers the advantage that easy and reliable actuation of the contact device can be enabled through the actuation opening. Additionally or alternatively, defined and low-friction deflection or excursion of the second spring clip can be achieved in order to cause a rebound of the second spring clip for the purpose of noise production.

Also, the key module may comprise an auxiliary actuator for actuating the contact device. The housing may comprise at least one holding portion for holding the auxiliary actuator. The auxiliary actuator may comprise at least one attaching portion for movably attaching the auxiliary actuator to the at least one holding portion of the housing. Additionally or alternatively, the auxiliary actuator may comprise at least one nose for deflecting the first spring clip and additionally or alternatively the second spring clip of the contact device upon the actuation of the key module. Using the holding portion and the attaching portion, movable attachment of the auxiliary actuator to the housing may be effected, wherein the movable attachment may be articulated or translational, for example. The second spring clip may be formed to produce the actuation sound upon rebound against the auxiliary actuator. The auxiliary actuator may comprise a nose for deflecting the first spring clip and additionally or alternatively the second spring clip or at least a first nose for deflecting the first spring clip and a second nose for deflecting the second spring clip. Such an embodiment offers the advantage that the contact device can be actuated in a robust and easy manner, wherein a variant of the contactor with one spring clip or two spring clips can be taken into account in a flexible manner in terms of construction.

Furthermore, the auxiliary actuator may comprise at least one fixing portion for fixing the auxiliary actuator to the first wing element or to the second wing element. The auxiliary actuator may be taken or moved along over the at least one fixing portion by at least one of the wing elements in at least one direction of movement upon the actuation of the key module. The at least one fixing portion may be formed as a protrusion. Such an embodiment offers the advantage that electric contact can be established and additionally or alternatively the actuation sound can be produced integrally in a reliable and robust manner upon the actuation of the key module. Furthermore, this can be achieved using a minimum amount of components and in a simple manner in terms of construction.

Furthermore, a keyboard is presented, wherein the keyboard comprises:

at least one item of an embodiment of the key module as previously mentioned; and

a circuit substrate, wherein the at least one key module is arranged on the circuit substrate.

At least one key module as previously mentioned may thus be employed or used in conjunction with the keyboard. The at least one key module is directly attachable to the circuit substrate, for example by means of soldering or inserting connector pins.

The key module described may be used as a replacement for existing key modules, for example for key modules with linear guiding. Such modules are robust, reliable, durable and have a classic switch mechanism with noble metal contacts and metal reset springs. The mechanical concept allows for precise, low-buckling linear movements with long actuation paths, e.g. 3 to 4 millimeters, and counts among the classic mechanical switches. Switches having different force-path characteristics as well as linear force-path characteristics, having tactile characteristics or a perceptible pressure point or working point and having click characteristics or perceptible and audible characteristics are widespread. Embodiments of the key module described here avoided disadvantages of such existing key modules and yet have the advantages previously mentioned, as well as reduced constructive height as compared to the previously mentioned modules. For this reason, embodiments of the key module described can be employed not only for flat keyboards but also for notebooks or the like.

The key module described may also be employed as a replacement for key modules with scissor-type mechanics as parallel guiding and with a rubber dome as a switch mechanism. Key modules with a scissor-type mechanics are flat in terms of construction, in conjunction with relatively long actuation paths. The functionalities of guiding and force-path characteristic mostly are distinct so that the scissor-type mechanics takes over the function of guiding or parallel guiding, and a rubber dome or snap disc forms a switch mechanism and is responsible for the specific force-path characteristic. In contrast to the scissor-type mechanics with numerous, partly unstable levers with many injuries, e.g. six hinges and four links, according to embodiments of the approach described here, for example, the parallel guiding can be made stable and precise, stiffness against tilting can be provided and durability can be increased. Furthermore, noise during actuation can be minimized. According to embodiments, also a force-path characteristic and reliability which are stable over the life of the module can be achieved, in contrast to some rubber domes of silicone due to settlement.

Double wing mechanics or butterfly mechanics are less widespread. Either classic rubber domes with and without switching films or the metal snap discs serve as switch mechanism. As it is known from basic mechanics, the wings of the double wing mechanics are half as long as the levers of the scissor-type mechanics. Due to this, such mechanics are stiffer with respect to tilting as compared to scissor-type mechanics. With the same angularity of the levers, an actuation path is half as long as in the case of scissor-type mechanics. The wings of the mechanics of are realized by means of a living hinge as a link. However, pseudo-parallel movement may occur if only one wing is pivoted and the second wing is realized as a link. This leads to displacement of the key transversally with respect to a direction of actuation during the actuation. A snap disc may also be chosen as switch mechanism here. The double wing mechanics also take on the role of parallel guiding here, whereas the snap disc forms a switch mechanism and provides for a specific force-path characteristic as well as for reset. Hinges may cause play and may have an effect on stiffness against tilting. Key modules with the double wing mechanics are advantageous with respect to stiffness against tilting and to parallelism. Embodiments of the key module described here can avoided disadvantages as well as achieve the previously mentioned advantages and also advantages with respect to the overall actuation path.

DETAILED DESCRIPTION OF EXEMPLARY EMBODIMENTS

In the subsequent description of preferred embodiments of the present invention, the same or similar reference numerals shall be used for similarly acting elements depicted in the various figures, wherein repeated description of these elements shall be omitted.

FIG. 1shows a schematic illustration of a keyboard100with key modules120according to an embodiment. For example, the keyboard100is part of a notebook computer, a laptop computer or the like. Alternatively, the keyboard100is a peripheral device for a computer, in particular.

The keyboard100comprises a circuit substrate110. The circuit substrate110is a conductor board, circuit board or the like, for example. According to the embodiment illustrated inFIG. 1, the keyboard100comprises a plurality of key modules120. The key modules120are arranged on the circuit substrate110. Here, the key modules120are soldered onto the circuit substrate110, for example.

Furthermore, according to the embodiment shown and described inFIG. 1, a keycap125is attached to each key module120. Each keycap125is coupled to a respective key module120. Each unit of key module120and keycap125represents a key of the keyboard100. Alternatively, each key module120represents a key of the keyboard100. Particularly the key modules120shall be explained in greater detail with reference to subsequent figures.

The keycap125represents a part of a key which is visible and touchable for a user of the keyboard100. Actuation of a key module120is effected by pressing onto the keycap125. Each key module120is configured to react to an actuation force with a force-path characteristic of resistance or a reset force. Furthermore, each key module120is configured to establish an electrical connection in response to actuation with a predefined actuation path, thereby performing a switching operation.

FIG. 2shows a partially exploded view of a key module120according to an embodiment. The key module120here corresponds to or is similar to the key module fromFIG. 1. According to the embodiment illustrated inFIG. 2, the key module120also comprises the keycap125. Alternatively, the keycap125is provided separately from the key module120and is coupleable thereto. In a state in which the keycap120is mounted to the key module120, the key module120and the keycap125represent a key. The keycap125represents a top part of the key module120or for the key module120. At least one alphanumeric character or special character is printed on the keycap125.

The key module120comprises a first wing element230and a second wing element230for guiding a movement of the key module120upon actuation by a user. The two wing elements230are coupled to each other mechanically. In the illustration ofFIG. 2, the wing elements230are shown in a non-actuated state of the key module120. In the non-actuated state, the wing elements230coupled to each other mechanically have an obtuse resting angle between each other. In an actuated state of the key module120, the wing elements230coupled to each other have an opening angle greater than the resting angle between each other. The opening angle may also be 180 degrees. A difference between the resting angle and the opening angle may, for example, line a range from about 12 degrees to 18 degrees.

Each wing element230comprises a bar, a first arm and a second arm. The arms extend away from the bar. In particular, the arms extend away from the bar at right angles. Also, the arms extend in parallel with respect to each other within a tolerance range, for example. Alternatively, the arms may also extend obliquely with respect to each other. According to the embodiment illustrated inFIG. 2, the first wing element230and the second wing element230are formed to be identical with each other. In addition, each wing element230is integrally formed here. For example, each wing element230is also formed of a metal material. It will be explained in greater detail with reference to subsequent figures how the wing elements230are formed and coupled to each other.

According to the embodiment shown and described inFIG. 2, each of the wing elements230comprises two mounting portions232for mounting a spring element and two bearing portions234for bearing the wing element230, for example. The mounting portions232are formed on the bar of the wing element230. The mounting portions232are formed as through-holes, particularly as rounded triangular through-holes, in the wing element230. The bearing portions234are formed on the arms of the wing element230. A first bearing portion234is formed on the first arm, and a second bearing portion234is formed on the second arm. The bearing portions234are formed as ledges, steps or noses in outside edges of the arms of the wing element230.

Each wing element230also comprises at least one connecting portion236for connecting the wing element230to a top part for the key module120. Here, the top part comprises the keycap125. According to the embodiment illustrated inFIG. 2, each wing element230comprises one connecting portion236, for example. The connecting portion236is formed on the bar of the wing element230. Here, the connecting portion236is formed as an elastically deformable beam. According to the embodiment shown and described inFIG. 2, the connecting portion236formed as an elastically deformable beam comprises an end portion238, which is bent into a base area region of the bar. The keycap is connectable to the wing elements230, and thus to the key module120, via a snap-fit by means of the connecting portions236.

The key module120further comprises at least one spring element240for providing a reset force upon the actuation of the key module120. According to the embodiment illustrated inFIG. 2, the key module120comprises one spring element240, for example. The spring element240is mounted to one of the mounting portions232of the first wing element230and to one of the mounting portions232of the second wing element230. Here, the spring element240is a tension spring.

The key module120also comprises a support element250for supporting the wing elements230. The support element250is also formed to support the spring element240and, if applicable, the keycap125when they are attached to the wing elements230. For example, the support element250is formed of a metal material. The support element250comprises a plurality of accommodating portions252for accommodating the bearing portions234of the wing elements230. According to the embodiment shown and described inFIG. 2, the support element250here comprises four accommodating portions252. The accommodating portions252are formed as bearing grooves in the support element250. In other words, the accommodating portions252are formed to be groove-shaped, v-shaped or swallow-tailed. The bearing portions234of the wing elements230are supported in the accommodating portions252in a mounted state of the key module120. Thus, the wing elements230are supported on the support element250so as to be pivotable or tiltable in a predefinable angle range. The angle range is also definable by a shape of the accommodating portions252.

The group of components comprising the wing elements230and the spring element240may also be referred to as guiding mechanism. Thus, the support element250is formed to support at least the guiding mechanism.

Moreover, the key module120comprises a switch unit260. The switch unit260comprises a housing270and a contact device280. The contact device280is at least partially arranged in the housing270. In other words, the housing270is formed to accommodate at least a subsection of the contact device280. According to the embodiment shown inFIG. 2, for example only one groove272four accommodating at least a subsection of the spring element240in an actuated state of the key module120formed in the housing270. The contact device280is configured to establish electric contact in the course of actuation of the key module120. The contact device280can be pressed or deformed by the keycap125, for example, in order to effect the establishment of the electric contact. The switch unit260shall be explained in greater detail with reference to subsequent figures.

FIG. 3shows a partially exploded view of the key module120fromFIG. 2in a partially assembled state.FIG. 3shows the key module120in a state further assembled as compared toFIG. 2. Here, the switch unit260is shown in an assembled state, wherein the contact device280is partially accommodated in the housing270. Furthermore, the wing elements230are supported on the support element250. The bearing portions234of the wing elements230are arranged in the accommodating portions252of the support element250.

FIG. 4shows a slant top view onto the key module120fromFIG. 2orFIG. 3in an assembled state. Due to the perspective in the illustration ofFIG. 4, the keycap125and the support element250are visible here of the key module120. In the assembled state of the key module120, the keycap125is connected to the wing elements, and the switch unit is arranged to be surrounded by the bars and arms of the wing elements.

FIG. 5shows a slant bottom view of the key module120fromFIG. 4. The keycap125, the wing elements230with two of the four mounting portions232, two of the four bearing portions234and one of the two connecting portions236with the bent end portion238are shown of the key module120here. Furthermore, the support element250with two of the accommodating portions252and soldering surfaces554, the housing270with a receiving bay574and the contact device280with soldering surfaces582are shown.

The soldering surfaces554of the support element250serve for attaching the support element252a circuit substrate of a keyboard. The soldering surfaces582of the contact device280of the switch unit serve for attaching the switch unit to the circuit substrate of the keyboard. Hence, the key module120can be fitted directly on the circuit substrate by soldering the soldering surfaces554and582onto the circuit substrate.

The receiving bay574for receiving a light source (not shown) is formed in the housing270of the switch unit. The light source may be a light-emitting diode for surface mounting or SMD LED (SMD=surface-mounted device; LED=light-emitting diode), for example. Furthermore, according to an embodiment, the housing270is formed of a transparent or opaque material, in particular a plastics material, at least in a subsection.

It can be seen in the illustration ofFIG. 5that the switch unit with the housing270and the contact device280is arranged in a constructed space surrounded by the bars and arms of the wing elements230.

According to another embodiment, in particular as an alternative to the soldering surfaces554and582, the support element and the switch unit may be attachable to the circuit substrate of the keyboard by means of connector pins (not shown).

FIG. 6shows a slant top view onto the key module120fromFIG. 2toFIG. 5in an assembled state and without keycap. Thus, the illustration inFIG. 6corresponds to the illustration fromFIG. 2orFIG. 3, except that the keycap is omitted and the key module120is shown in the assembled state.

FIG. 7shows a slant view of a subsection of the key module fromFIG. 2toFIG. 6. The subsection of the key module illustrated inFIG. 7includes the guiding mechanism. i.e. the wing elements230and the spring element240. In the illustration ofFIG. 7, the mounting portions232, the bearing portions234, the connecting portions236and first coupling portions731as well as second coupling portion733are shown of the wing elements230here.

The coupling portions731,733are formed to couple the wing elements232each other mechanically. Each wing element230comprises a first coupling portion731and a second coupling portion733. The first coupling portion731is formed at an end of the first arm of each wing element230, and the second coupling portion733is formed at an end of the second arm of each wing element230. The first coupling portion731and the second coupling portion733of each wing element230are formed differently. All first coupling portions731are formed identically, and all second coupling portions733are formed identically. Thus, the first coupling portion731of the first wing element230is coupleable to the second coupling portion733of the second wing element230, and the second coupling portion733of the first wing element230is coupleable to the first coupling portion731of the second wing element230. According to the embodiment illustrated here, the first coupling portion731is formed as a link, and the second coupling portion733is formed as a protrusion or a plate. According to another embodiment, the first coupling portion and the second coupling portion may be formed as teeth.

FIG. 8shows a side view of the key module120fromFIG. 4orFIG. 5. In the side view ofFIG. 8the keycap125, the wing elements230with two of the bearing portions234, the support element250with two of the accommodating portions255and the housing270of the switch unit are illustrated of the key module120here.

FIG. 9shows a side view of the key module120fromFIG. 4orFIG. 5. The side view illustrated inFIG. 9corresponds to the side view fromFIG. 8, except that the key module120inFIG. 9is rotated by a quarter turn about an orthogonal to a surface of the keycap125printed with characters as compared to the illustration fromFIG. 8. In the side view ofFIG. 9, the keycap125, the spring element240, the support element250and the housing270of the switch unit with the groove272are illustrated of the key module120.

FIG. 10shows a top view onto a keycap125. The keycap125is the keycap from one of the previously described figures or a similar keycap.

FIG. 11shows a side view of the key module120fromFIG. 6. The side view shown inFIG. 11corresponds to the side view illustrated inFIG. 9, except that the keycap omitted. Thus, in the illustration ofFIG. 11, one of the wing elements230with the connecting portion236, the spring element240, the support element250and the housing270of the switch unit with the groove272are shown of the key module120.

FIG. 12shows a side view of the key module120fromFIG. 4orFIG. 5. The side view shown inFIG. 12corresponds to the side view illustrated inFIG. 8, except that the keycap is omitted. Thus, in the illustration ofFIG. 12, the wing elements230with two of the bearing portions234, the spring element240, the support element250with two of the accommodating portions255and the housing270of the switch unit are shown of the key module120.

FIG. 13shows a top view onto the key module120fromFIG. 6,FIG. 11orFIG. 12. In the illustration ofFIG. 13, the wing elements230with the mounting portions232, the connecting portions236and the coupling portions731and733, the spring element240, subsections of the support element250, the housing270with the groove272and subsections of the contact device280are shown of the key module120. Bars1335, first arms1337and second arms1339of the wing elements230also are explicitly designated inFIG. 13. Moreover, a subsection1376of the housing270formed as at least one lens is shown. Here, the groove272is arranged between the subsection1376and a further subsection of the housing270in which the contact device280is partially accommodated. The subsection1376of the housing270is formed to scatter and/or focus light from a light source. The light source also may be accommodated at least partly within the housing270, according to an embodiment.

FIG. 14shows a contact device280for a key module according to an embodiment. The contact device280corresponds to or is similar to the contact device from one of the previously described figures. Hence, the contact device280is usable as a contact device for a switch unit of a key module of one of the previously described figures.

The contact device280comprises a fixed contact piece1482and a contactor1484. The fixed contact piece1482and the contactor1484are electrically isolated from each other. A first contact of the contact device280is arranged on the fixed contact piece1482. A second contact of the contact device280is arranged on the contactor1484.

The contactor1484comprises a first spring clip1486carrying the second contact and only exemplarily two actuation portions1488. The first spring clip1486is movable via the actuation portions1488until electric contact is established between the first contact and the second contact. The actuation portions1488may, for example, be actuated by a top part for the key module or of the key module upon actuation of the key module. The contactor1484is elastically deformable. Thus, the contactor1484also functions as an elastic means.

According to an embodiment, the fixed contact piece1482and the contactor1484each comprise at least one soldering surface, as shown inFIG. 5.

FIG. 15shows the contact device280fromFIG. 14. More specifically,FIG. 15shows the contact device280ofFIG. 14from another perspective. Here, also the first contact1583and the second contact1585are shown and indicated explicitly.

The first contact1583comprises a linear or elongated contact region with a first axis of extension, and the second contact1585comprises a linear or elongated contact region with a second axis of extension. The first axis of extension and the second axis of extension cross each other, wherein electric and mechanical contact can be established between the first contact1583and the second contact1585in a punctiform contact portion.

According to the embodiment illustrated here, each axis of extension extends obliquely, in particular at an angle of 45 degrees, for example, with respect to a longitudinal axis or transversal axis of the fixed contact piece1482or the contactor1484. According to the embodiment illustrated inFIG. 15, the first contact1583and the second contact1585each have a triangular sectional profile. For example, the contacts1583and1585are cut from a wire and welded on the contact device280.

FIG. 16shows a contact device280for a key module according to an embodiment. The contact device280inFIG. 16corresponds to the contact device fromFIG. 14orFIG. 15, except that the contactor1484comprises only one actuation portion1488and is formed differently, in particular with respect to the first spring clip1486and the actuation portion1488. In other words, the contact device280inFIG. 16represents a constructive variant of the contact device fromFIG. 14orFIG. 15. Thus, the contact device280inFIG. 16is similar to the contact device fromFIG. 14orFIG. 15. Only the first contact1583of the contacts of the contact device280is visible due to a prospective chosen in the illustration.

FIG. 17shows a contact device280for a key module according to an embodiment. The contact device280inFIG. 17corresponds to the contact device fromFIG. 16, except that the contactor1484is formed differently, in particular with respect to the first spring clip1486and the actuation portion1488.

FIG. 18shows a contact device280for a key module according to an embodiment. The contact device280inFIG. 18corresponds to the contact device fromFIG. 14orFIG. 15, except that the contactor1484is formed differently, in particular with respect to the first spring clip1486and the actuation portions1488. Only the first contact1583of the contacts of the contact device280is visible due to a prospective chosen in the illustration.

With reference to theFIGS. 14 to 18, it is to be noted that the contact device280, particularly the contactor1484with the at least one actuation portion1488and the first spring dip1486, is formed to establish the electric contact while producing friction between the first contact1583and the second contact1585.

FIG. 19shows a sectional view of a key module120according to an embodiment. The key module120inFIG. 19is similar to the key module fromFIG. 2,FIG. 3,FIG. 4,FIG. 5,FIG. 8orFIG. 9. InFIG. 19, the keycap125with a top cam1928, the wing elements230, the spring element240, the support element250and, merely by way of example, two bottom cams1978are illustrated of the key module120.

The top cam1928is formed as a subsection of the keycap125. More specifically, the top cam1928is formed as a subsection of the keycap125protruding toward the spring element240. The bottom cams1978are formed as subsections of the housing of the switch unit. The bottom cams1978are formed as subsections of the housing protruding toward the spring element240. The bottom cams1978are arranged in the groove of the housing, for example. Thus, the spring element240is arranged between the top cam1928and the bottom cams1978. The cams1928and1978are formed to deform, more specifically elastically deform, the spring element240in an actuated state of the key module120.

The spring element240is deformable by the cams1928and1978with increasing actuation path upon actuation of the key module120. The cams1928and1978are formed and arranged to bend spring element240. A spring force of the spring element240loses linearity upon deformation by the cams1928and1978, wherein a reset force acting against an actuation force or a resistance acting against an actuation force increases due to the deformed spring element240.

According to an embodiment, additionally or alternatively, at least one cam may be formed on the support element250.

FIG. 20shows a partially exploded view of a key module120according to an embodiment. The key module120corresponds to the key module from one of the previously described figures, except that the key module120comprises a switch unit with a different contact device280and housing270adapted there to and additionally an intermediate piece2025, which is coupleable to the keycap125. The keycap125and the intermediate piece2025here represent the top part for the key module120. The intermediate piece2025is connectable to the wing elements230by means of the connecting portions236. The keycap125is coupleable to the intermediate piece2025.

FIG. 21shows a partially exploded view of a key module120according to an embodiment. The key module120corresponds to the key module from one of theFIGS. 2 to 29orFIG. 19, except that the support element250comprises anchoring portion is2156for anchoring a stabilizing bracket2190for stabilizing a top part for the key module120with respect to torsional moments and bending moments. The anchoring portions2156are formed as eyes. According to the embodiment illustrated here, for example, two anchoring portions2156are formed on the support element250. The top part for the key module120here comprises the keycap125. The stabilizing bracket1190is bent in a U-shaped manner. The stabilizing bracket1190is anchored in the anchoring portions to156. According to an embodiment, the key module120comprises the stabilizing bracket1190.

FIG. 22shows a slant view of a subsection of a key module according to an embodiment. The subsection illustrated inFIG. 22corresponds to the subsection shown inFIG. 7, except that two spring elements240, which are formed as compression springs, are provided, and a support element250similar to the support element from one of the previously described figures is shown in the illustration, wherein the wing elements230and the support element250are partly adapted to the spring elements240in terms of construction.

Each of the spring elements240extends along a pair of coupled arms of the wing elements230. The mounting portions of the wing elements230are obscured by wall portions of the support element250comprising the accommodating portions252in the illustration ofFIG. 22. The wing elements230are coupled to each other via the coupling portions731and733and comprise the bearing portions234and the connecting portions236.

FIG. 23shows a partially exploded view of a key module120according to an embodiment of the present invention. The key module120according to the embodiment of the present invention shown inFIG. 23corresponds to the key module from one of the previously described figures, except that the housing270and the contact device280of the switch unit as well as the connecting portion236of each wing element230are formed differently, and the key module120additionally comprises an auxiliary actuator2392.

The illustration inFIG. 23is similar to the illustration fromFIG. 2orFIG. 20. InFIG. 23, in particular the keycap125, the wing elements230with the mounting portions232, the bearing portions234and the connecting portions236, the spring element240, the support element250with the accommodating portions252, the housing270with the272, the subsection1376, two actuation openings2371and a holding portion2375, the contact device280with the fixed contact piece1482, the contactor1484, the first spring clip1486, two actuation portions1488and a second spring clip2387, and the auxiliary actuator2392are shown of the key module120.

According to the embodiment of the present invention illustrated inFIG. 23, for example two actuation openings2371for exposing the at least one actuation portion1488of the contact device280are formed in the housing270. Furthermore, the housing270comprises at least one holding portion2375for holding the auxiliary actuator2392. According to the embodiment of the present invention illustrated here, the at least one holding portion2375is formed as a pin. The housing270is arranged on the support element250. The auxiliary actuator2392is formed to actuate the contact device280. The auxiliary actuator2392is formed of plastics material. The contactor1484of the contact device280comprises the second spring clip2387for producing an actuation sound in addition to the first spring clip1486carrying the second contact. The first spring clip1486comprises an actuation portion1488. Furthermore, the second spring clip2387also comprises an actuation portion1488. The contactor1484is integrally formed. In particular, the contactor1484is formed as a stamped part or a stamped and bent part of a metal material.

With reference to subsequent figures, the housing270, the contact device280and the auxiliary actuator2392shall be explained in greater detail.

FIG. 24shows a partially exploded view of parts of the key module120fromFIG. 23. The illustration inFIG. 24corresponds to the illustration ofFIG. 23, except that the keycap is omitted in the illustration.

FIG. 25shows a slant top view onto the switch unit260and the support element250fromFIG. 23orFIG. 24in a partly assembled state. The contact device is partially accommodated in the housing270. The actuation portions1488of the contact device are visible through the actuation openings2371of the housing270.

FIG. 26shows the contact device280fromFIG. 23,FIG. 24orFIG. 25. Herein, the first contact1583arranged on the fixed contact piece1482is indicated explicitly. The first spring clip1486and the second spring clip2187extend alongside each other and across the fixed contact piece1482. What can also be seen more clearly in the illustration ofFIG. 26is that the first spring clip1486is tapered in the actuation portion1488. On a side facing away from the first spring clip1486, the actuation portion1488of the second spring clip2387comprises a kink at which the actuation portion1488is bent toward the fixed contact piece1482and the first spring clip1486.

FIG. 27shows the auxiliary actuator2392fromFIG. 23orFIG. 24in a slant bottom view. According to the embodiment of the present invention illustrated here, the auxiliary actuator2392comprises two attaching portions2794, two noses2796and three fixing portions2798. The auxiliary actuator2392is integrally formed, for example of plastics material.

The attaching portions2794are formed to allow for movably attaching the auxiliary actuator2392to the at least one holding portion of the housing of the switch unit. The attaching portions2794are arcuate or hook-shaped and are formed to accommodate the at least one holding portion by latching or snapping.

The noses2796are formed to deflect the first spring clip and/or the second spring clip of the contact device upon the actuation of the key module. According to another embodiment, wherein the contact device is formed differently, the auxiliary actuator2392may comprise only one nose2796and/or at least one differently formed nose2796.

The fixing portions2798are formed to fix the auxiliary actuator to392to the first wing element or to the second wing element. The fixing portions2798are formed as protrusions. According to another embodiment, the auxiliary actuator2392may comprise a different number of fixing portions2798and/or differently formed fixing portions2798.

FIG. 28shows the auxiliary actuator2392fromFIG. 23,FIG. 24orFIG. 27in a slant top view. Due to the illustration, one of the noses2796is obscured by one of the fixing portions2798. It can be seen that the fixing portions2798are disposed and formed to arrange the bar of one of the wing elements between one of the fixing portions2798and the remaining two fixing portions2798.

FIG. 29shows a partially exploded view of parts of the key module120fromFIG. 24in a partially assembled state. The spring element240is hooked into one mounting portion232each of the first wing element230and of the second wing element230. Furthermore, the wing elements230are coupled to each other via their coupling portions. The switch unit and the support element250shown in the state ofFIG. 25. Thus, the contact device is at least partially accommodated in the housing270.

FIG. 30shows a slant top view onto the key module120fromFIG. 24orFIG. 29in a mounted and non-actuated state. The wing elements230are attached to the support element250, wherein the bearing portions234of the wing elements230are arranged in the accommodating portions252of the support element250. The auxiliary actuator2392is attached to the housing270by means of its attaching portions and is fixed to one of the wing elements230by means of its fixing portions. A plane of extension of the auxiliary actuator2392is inclined relative to a plane of extension of the housing270.

FIG. 31shows a slant top view onto the key module120fromFIG. 24,FIG. 29orFIG. 30in a mounted and actuated state. It can be seen that the spring element240is plunged into the groove272of the housing270. Part of an actuation force exerted on the wing elements230is transferred to the contact device of the switch unit via the auxiliary actuator2392. The plane of extension of the auxiliary actuator2392is oriented along the plane of extension of the housing270in the actuated state of the key module120.

FIG. 32shows a side view of the key module120fromFIG. 30. The illustration inFIG. 32is similar to the illustration ofFIG. 12. In the side view ofFIG. 32, the wing elements230with two of the bearing portions234, the spring element240, the support element250with two of the accommodating portions252, a subsection of the housing270as well as a subsection of the auxiliary actuator2392are shown of the key module120. What is also depicted is a cutting line A-A for a sectional view or partially sectional view through the key module120. The cutting line A-A extends transversally to a longitudinal axis of the spring element240.

FIG. 33shows a partially sectional view of the key module120fromFIG. 32along the cutting line A-A. In the partially sectional view ofFIG. 33, subsection is one of the wing elements230with two of the mounting portions232, subsections of the spring element240, subsections of the supporting element250, subsections of the housing270a deflecting portion3373, subsections of the auxiliary actuator2392with the two noses2796and subsections of the contact device with the first spring clip1486, the second spring clip2387, the first Kontakt1583and the second Kontakt1585are shown of the key module120.

It can be seen that a first one of the noses2796of the auxiliary actuator2392is formed and arranged to actuate or deflect the first spring clip1486, and thus to close the contacts1583and1585. Furthermore, it can be seen that a second one of the noses2796of the auxiliary actuator2392is formed and arranged to actuate or deflect the second spring clip2387in order to produce an actuation sound. The deflecting portion3373of the housing270is formed to deflect the second spring clip2387of the contact device280when the key module120is being actuated. The deflecting portion3373is obliquely inclined with respect to a movement or axis of movement of the key module120during actuation thereof. A kink angle of the actuation portion of the second spring clip2387is greater than an angle of inclination of the deflecting portion3373relative to the axis of movement. Thus, a terminal edge of the second spring dip2387is spaced from the deflecting portion3373. In this way, friction, scratching and the like between the deflecting portion3373and the actuation portion of the second spring dip2387can be minimized or prevented.

During actuation of the key module120, there is movement of the wing elements230, which is transferred to the first spring clip1486and to the second spring clip2387via the auxiliary actuator2392. In the course of such an excursion movement of the first spring dip1486, the first contact1583and the second contact1585come into contact with each other. Furthermore, in the course of such an excursion movement of the second spring clip2387, it is deflected laterally at its actuation portion by the deflecting portion3373. Due to the slope or inclination of the deflecting portion3373relative to the movement, the lateral deflection of the second spring dip2387increases with increasing excursion, until the actuation portion of the second spring dip2387slips from the nose2796of the auxiliary actuator2392actuating the same, and there is a rebound of the second spring dip2387against the housing270or the auxiliary actuator2392, which produces the actuation sound.

Embodiments shall subsequently be summarized and described in other words with reference to the previously described figures.

In particular, double wing mechanics, which fulfils the task of parallel guidance of the key and the task of resetting and of the specific force-path characteristic, form one basis of the key module120. The wing elements130of the double wing mechanics are designed as stamped parts, for example. This allows for inexpensive manufacture of the parts from high-tensile steel and thus results in advantages regarding stiffness and wear. It is also conceivable to form the parts of plastics, for example. Moreover, the wing elements230are designed as same parts, and two wing elements230are used per key module120. The double wing mechanics are designed for an optimum actuation path of about 1.5 millimeters or the like, for example.

In order to reduce disadvantageous play, the wing elements230are not designed as a rotational hinge but by means of bearing notches, i.e. the accommodating portions252, wherein a pivoting movement can be performed in a predefined angular range only. As the two wing elements230are tightened together by means of the at least one spring element240and are pressed into the accommodating portions252, the two wing elements230move without play or with little play and with little noise. The wing elements230are connected to each other by the coupling portions731and733or also by means of links which decouple counter-rotations of both wing elements230occurring upon actuation of the key module120. The accommodating portions252, bearing portions234, links or first coupling portion731and mounting portions232or spring mounts are arranged such that the key module120exhibits a decreasing force-path characteristic after an early maximum during actuation.

This means that a reset force is highest in the rest position. In the end position or completely actuated state, the reset force approaches zero. The force-path characteristic can be adjusted arbitrarily, in particular by means of the spring element240and the switch unit260as well as optionally cams1928and/or1978. The intermediate piece2025or the keycap125is latched on connecting portions236of the wing elements230formed as preloaded balance springs or leaf springs by means of two catches, and thus is floatingly suspended without play. During the actuation, the top part125or125and2025moves uniformly, i.e. parallel to the support element250. As stiffness of the metal wing elements230is high and overall play in the guiding mechanism is minimized, the top part125four125and2025or top key part moves precisely and uniformly. The mechanic switch mechanism260, which forms the classic, mechanic switch, is surrounded by the guiding mechanism.

The switch mechanism comprises the housing270and the contact device280with two contact parts: the fixed contact piece1482and the elastic contactor1484. Both contact parts are equipped with so-called crosspoint gold contacts, for example, which enhances durability and reliability of the switch unit260. The housing270of the switch mechanism also has an optical function, wherein the housing270is configured to guide light from a light source and distribute it onto an inner surface of the keycap125.

At the beginning of the actuation, an actuation force at first surges because the guiding mechanism is preloaded by the at least one spring element240and the reset force is highest the rest position. This behavior of the key module120allows for realizing a very short pre-travel, wherein it can particularly be avoided that a key command is triggered erroneously by accidentally touching a key. If the switch unit was a rubber dome, the increase in force would be significantly more shallow and with a longer pre-travel. After a predefined pre-travel, an actuating element of the keycap125contacts the at least one actuation portion1488or an actuation tongue of the contactor1484, and the contacts1583and1585or crosspoint contacts are closed after a defined path. From this contact on, the force-path characteristic of the key module120changes, because the force-path characteristic of the switch mechanism or switch unit260is included into the force-path characteristic of the guiding mechanism. From the contact on, the stiffness of the contactor1484changes so that the switching point can be perceived by experienced users, wherein the force-path characteristic exhibits a bend. Among other things, this may be advantageous for computer games, because further actuation of the key is not necessarily required, and actions speed and effectiveness in the game can be increased thereby. During further actuation or an overtravel path, the spring body of the at least one spring element240hits a bottom cam1978or supporting cam of the switch mechanism casing or housing270. From this moment on, the spring body starts to bend and exhibits an increasing force characteristic, which makes the keystroke soft.

The switch mechanism or switch unit260is latchable in a base or the support element250. The support element250of the key module120is a stamped part, for example, so that the key module120can be realised as a single, SMD solderable part. This allows for flexibly placing the switch units260along with other SMD parts, such as LEDs, resistors, diodes etc., on the circuit substrate110in one fitting process by means of conventional SMD placement equipment. This reduces overall manufacturing costs, allows for flexible design of the key field of a keyboard100, and saves investment in machinery, equipment and tools. In consequence of flat soldering pads or soldering surfaces554and582, independence from a thickness of the circuit substrate110can be obtained, and the key modules120can be fitted on circuit films, for example. As an alternative, the key module120can be realized with conventional plug connections and soldered as usual with wave soldering machines.

In the following, different variants for the top part125and/or2025shall be presented briefly. In a simplified variant, the top part may be realized in form of the keycap125as a single part. In this case, keycaps125may, for example, be varnished and then lettered according to arbitrary country variants either individually or as an entire key field by means of laser methods. Optionally, the top part may be provided as an intermediate piece2025which is designed as a standard part. The keycap125a then be realized as a simple shell and be snapped onto the intermediate piece2025. Lettering may be done as previously described. As an alternative, key symbols may be produced by means of two-component technology, for example. Changing country variants is done by exchanging keycaps125. The keycap125and/or the intermediate piece2025can be provided by the customer.

The stabilizing bracket2190or key stabilizer can be provided inexpensively. A round wire bent into U shape can be used as the stabilizing bracket2190. The middle part of the stabilizing bracket2190is snapped into the keycap125or into the intermediate piece2025and pivoted by means of hinges. The support element250is formed with two additional lugs in form of the anchoring portions2156. Among other things, each anchoring portion2156comprises an angled region with one bore each for a leg of the stabilizing bracket2190. For assembly, the legs of the stabilizing bracket2190fit into the holes. The anchoring portions2156may additionally be soldered to further soldering pads of the circuit substrate110. This increases mechanical strength of the key module120. By means of the stabilizing bracket2190, multiple mechanics for elongated keys and protection against torsional moments and bending as well as for lateral stability can be provided. The anchoring portions2156may, for example, be stamped together with the support element250.

The key module120can be constructed according to a modular design principle. The at least one spring element240has a function of decoupling the top part125and/or2020and a function of allowing for free-of-play, uniform movement of the top part125and/or2020. The wing elements230and the support element250being formed as metal parts offers the advantage that a metal construction is stiff and inexpensive. The force-path characteristic upon actuation exhibits a maximum after minimum actuation path and then an almost linearly decreasing course until after an angular point until contact between the at least one spring element240and the cam or cams1928and/or1978.

If an embodiment comprises an “and/or” connection between a first feature and a second feature, this may be read so as to mean that the embodiment comprises both the first feature and the second feature according to one variant of the embodiment and either the first feature or the second feature according to another variant of the embodiment.

REFERENCE NUMERALS