Method and apparatus for carrying circuit assemblies

An apparatus for a circuit assembly, including two plates which are adapted to hold a circuit assembly, connected by a hinge, and including a hold-down adapted to interlock the circuit assembly to a plate, and a sliding lock adapted to secure the plates. Examples of the present subject matter include embodiments wherein the sliding lock secures the first plate and second plate in a first mode of operation, and releases the first plate in a second mode of operation, and wherein the hold-down interlocks the circuit assembly to the first plate in a first state of operation, and interlocks the circuit assembly to the second plate in a second state of operation. Further, the present subject matter includes a method for using a circuit carrier to hold a circuit assembly.

TECHNICAL FIELD

This disclosure relates generally to electronic circuit assemblies, and more specifically, to a carrier used for holding a circuit assembly.

BACKGROUND

Electronic circuitry consistently becomes increasingly sophisticated. New electrical circuit boards are more complex and more compact than prior designs. For example, many modern circuit assemblies include more functionality per unit of volume than older designs. New technologies, such as smaller components, or new manufacturing methods, are often used to produce smaller or more complex designs.

One group of devices which benefit from increased functionality per unit volume is implantable cardiac defibrillators (“ICDs”). ICDs are used to promote cardiac wellness in humans. Patients with irregular heart rhythms have had defibrillators implanted in their bodies, typically near their hearts. These devices detect cardiac wellness and apply corrective electrical therapy, including one or more bursts of electric current. ICDs are able to deliver more sophisticated therapies by using sophisticated electrical circuitry. Additionally, ICDs provide less patient discomfort when they are smaller. Because of this, devices using compact circuitry have been designed.

However, designs which include more electrical circuitry per unit volume often utilize new technologies, such as flexible circuitry, which can be more fragile when used in existing manufacturing processes. Additionally, designs which are more densely populated with components exhibit increased vulnerability to damage. Further, processes which move circuitry from one step to another often require the use of multiple fixtures. Repeatedly using fixtures to hold a circuit assembly increases the potential for mishandling.

As such, there is a need in the art for a method and apparatus to transport circuitry which reduces the potential for handling damage without reducing the ability to work with the circuitry.

SUMMARY

The above-mentioned problems and others not expressly discussed herein are addressed by the present subject matter and will be understood by reading and studying this specification.

In various embodiments, the present subject matter relates to an apparatus for a circuit assembly having a first side and a second side, and including a first plate adapted to hold the first side of the circuit assembly and including a first hinge mount, a second plate adapted to hold the second side of the circuit assembly and including a second hinge mount, a hold-down adapted to interlock the circuit assembly to one of the first plate and the second plate, a sliding lock adapted to secure the first plate to the second plate, and a hinge connected to the first hinge mount and the second hinge mount. Additionally, in various embodiments, the present subject matter includes embodiments wherein the sliding lock secures the first plate and second plate in a first mode of operation, and releases the first plate in a second mode of operation, and wherein the hold-down interlocks the circuit assembly to the first plate in a first state of operation, and interlocks the circuit assembly to the second plate in a second state of operation.

The present subject matter also includes a method for a circuit assembly having a first side and a second side, including connecting a first plate to a second plate with a hinge, using a first plate to hold a first side of the circuit assembly, using a hold-down to interlock the circuit assembly to the first plate in a first mode of operation, and using the hold-down to interlock the circuit assembly to the second plate in a second mode of operation. Additionally, in various embodiments, the present subject matter includes mating the first plate and the second plate and using a lock to secure the first plate to the second plate in a first state of operation, and to release the second plate in a second state of operation.

DETAILED DESCRIPTION

FIG. 1illustrates an exploded view of a circuit carrier100and a circuit assembly, in one embodiment of the present subject matter. In various embodiments, the circuit carrier100includes a first plate102, a second plate104, at least one hinge106connecting them, at least one circuit hold-down108adapted to interlock the circuit assembly110to one of the first plate102and the second plate104, and at least one clasp112adapted to secure the first plate to the second plate. In various embodiments, circuit assembly110includes rigid circuit assemblies, flexible circuit assemblies, or combinations thereof.

FIG. 2illustrates a circuit carrier100and a circuit assembly110, in one embodiment of the present subject matter. In various embodiments, the first plate102and the second plate104are sandwiched together, with a circuit assembly110disposed between the first plate102and the second plate104. In some examples, a clasp112and a hinge106work in conjunction to secure the first plate102and the second plate104. In various embodiments, the circuit carrier servers to absorb forces from external objects which might otherwise directly contact the circuit assembly and damage it.

FIG. 3illustrates a circuit carrier100and a circuit assembly110, in one embodiment of the present subject matter. The figure illustrates an additional view of the circuit carrier100.

FIG. 4illustrates a perspective view of the top of a plate102for a circuit carrier, in one embodiment of the present subject matter. In various embodiments, a circuit carrier uses a plate102which is substantially planar. Various embodiments of the plate102include features which perform various functions. For example, in one embodiment, the plate102includes features adapted to mate with a circuit assembly. Varying embodiments, for example, include depressions which match with raised portions on a circuit assembly. One example includes features adapted to protect portions of a flexible circuit assembly from being cut. Other features also exist within the scope of the present subject matter, and the limitations listed here are not intended to be exhaustive or exclusive of the present subject matter.

Various embodiments of the plate102include at least one aperture410. In various embodiments, an aperture410is adapted for exposing portions of a circuit. One example exposes portions of a circuit assembly so that the circuit assembly may be welded or inspected. Various examples also expose portions of a circuit assembly for additional operations, such as crimping components to the circuit assembly. Other manufacturing steps also use the at least one aperture410, and those uses enumerated here are not provided in a limiting sense.

Varying embodiments of the plate102include an interface adapted for receiving a hold-down. In some embodiments, a plate with an interface adapted to receive a hold-down includes features which form a recess402. In various embodiments, the recess402is formed in part by a recess connected to a keyed passage. Various embodiments of the recess402are designed to mate to a keyed hold-down. Some examples are designed to allow a keyed hold-down to rotate after mating to the recess402. Additional embodiments allow rotation while constraining the hold-down to the plate102. In one embodiment, the recess402includes a stop which is adapted to limit rotation of a keyed hold-down after the hold-down has been mated to the interface.

Varying embodiments also provide for a lock or for tactile feedback which indicates to the user what position the hold-down is in. In one example, a lock prevents the hold-down from moving relative to the recess402. For example, in one embodiment, the recess402includes a depression, and the hold-down a compatible raised member, such that the raised member mates to the depression and resists further movement of the hold-down relative to the recess402. However, in some embodiments, a predetermined force will suffice to force the hold-down or the recess402, or both, to deform and allow further rotation of the hold-down.

Some examples of the plate102of the present subject matter include a boss412. In various embodiments, the boss412is cylindrical, and adapted to mate with a compatible feature in a hinge. In one example, a similarly shaped socket is used for mating with the boss412. In various embodiments, the fit between a plate and the socket is loose, and in others it is an interference fit, and it still others, it is tuned to provide a desired level of friction. Varying embodiments also include features in the boss which enable adjustment of the hinge, relative to the plate, in measured increments. For example, in some embodiments, the boss412includes at least one recess, and the mating feature on a hinge includes at least one raised feature compatible with each recess, such that rotation of the hinge requires the hinge or boss or both to elastically deform whenever the feature of the plate is not mated with a recess in the socket. This elastic deformation, in various embodiments, compels the hinge to come to rest in a position where the raised feature on the plate mates with a recess, in order to relieve the deformation. The overall result of using recesses in the boss412, in various embodiments, enables predetermined incremental adjustment.

Various embodiments of the plate102of the present subject matter include a deformable member408adapted to connect to a hinge. In various embodiments, the deformable member408is an elongate member which includes a boss. In various embodiments, the boss is adapted to mate with a compatible feature in a hinge. For example, in one embodiment, the boss is adapted to mate with a similarly shaped socket in the hinge. In various embodiments, the fit between a plate and the socket is free, and in others it is an interference fit, and it still others, it is tuned to provide a desired level of friction. Varying embodiments also include features in the boss which enable adjustment of the hinge to the plate in measured increments, similar to that discussed above. For example, in some embodiments, the boss includes at least one recess, and the mating feature on a hinge includes at least one raised feature compatible with each recess, such that rotation of the hinge requires the hinge or boss or both to elastically deform whenever the feature of the plate is not mated with a recess in the socket.

In one example, the elongated member408allows for deformation stresses to be distributed along the length of the elongate member408. This elastic deformation, in various embodiments, compels the hinge to come to rest in a position where the at least one raised feature on the plate mates with a recess, in order to relieve elastic deformation. The overall result of using recesses in the boss408, in various embodiments, enables predetermined incremental adjustment.

In varying embodiments, the elongate member408is elastically deformed to connect a hinge. Further, in some embodiments, the elongate member408is adapted to conform to variations in plate alignment by flexing to compensate for dimensional variation. Some examples of the deformable member408provide for a safety release which disconnects a hinge when a predetermined force is applied. Various examples will not disconnect a hinge until a force is applied at a predetermined angle. Various examples include stress risers which are designed to provide for a controlled failure of the elongated member408.

These are just examples of various embodiments of a plate, and these descriptions are not intended to be a complete list of the embodiments within the scope of the present subject matter. For example, in some embodiments, the hinge contains a boss, and the plate102contains a socket. Various combinations of hinges and bosses are also within the scope of the present subject matter.

Various embodiments of the plate of the present subject matter include features which form at least one opening406. In various embodiments, an opening406may be used for alignment. For example, in one embodiment, at least two openings406are located in an asymmetrical fashion in a plate102and are adapted to mate to another plate. In various embodiments, by including mating features on the other plate, such as pegs, which are compatible with the openings406, the plate102and the other plate can be assembled in only one way. In other embodiments, a set of openings406arranged in a symmetrical fashion are used. It should be noted that the scope of the present subject matter includes various shapes which can be used as openings406, including cylindrical openings, rectangular openings, and other types of openings. It should also be noted that in various embodiments, an opening forms a passage through the plate102. In further embodiments, a feature used for alignment, such as opening406, is cup shaped.

Various embodiments of the present subject matter include markings404which are used for communicating information. For example, in one embodiment, the markings404are used to indicate what position a hold-down is in. In one example, markings404are used to coordinate the position of two hold-downs. Varying embodiments of a circuit carrying assembly will not allow the separation of two plates unless all the hold-down positions are coordinated. Markings404, in various embodiments, enable a user to determine if all the hold-downs are in place. In various embodiments, a user can read markings404by looking at them. Also, varying embodiments use a machine to read the markings404.

Some embodiments of the plate of the present subject matter include a clasp interface414. In varying embodiments, the clasp interface414is adapted to mate with a slidable clasp. In some embodiments, the clasp moves in a manner which is not sliding. For example, in one embodiment, the clasp rotates. As such, in varying embodiments, the clasp interface414can include screw threads or a lock. In one embodiment, the clasp interface includes a wedge shaped member, which is adapted to provide increasing resistance as a clasp is moved to a locked position. Additional embodiments of the clasp interface414include features which are adapted to permanently connect to a clasp. In one embodiment, a clasp connects to a plate102, and is movable while connected to the plate. The clasp can remain connected to plate102while not in use carrying a circuit assembly.

Further, in some embodiments, the clasp interface414includes features which provide locking and tactile feedback. For example, in one embodiment, the clasp interface414includes a series of ridges which are compatible with mating features on a clasp. In various embodiments, when a clasp is slid on the clasp interface414with a series of ridges, the user can detect motion by feeling incremental changes in position, or by hearing the sound created by the features of the clasp interface414moving into and out of a resting position with a clasp. Varying embodiments of the clasp interface414include a locking feature. In various embodiments, a locking feature is a notch in the clasp interface414designed to mate with a raised feature on a clasp. In one embodiment, the locking feature provides tactile feedback of lock engagement, and it includes an audible noise.

Various embodiments of the present subject matter rely on deformation of the clasp, the clasp interface414, or both, in order to allow motion of the clasp relative to the clasp interface414. In various embodiments, the clasp is plastic. However, it should be noted that other embodiments not enumerated here fall within the scope of the present subject matter.

Varying embodiments of the plate102include an exterior surface420. In various embodiments, the interior surface is adapted to mate with the exterior surface of another plate. Additionally, in various embodiments, the plate102includes a perimeter surface416. In one embodiment, the perimeter surface416includes a taper. Various embodiments including a taper allow a user to better manipulate the plate both individually and as part of a circuit assembly carrier.

In various embodiments, the plate102is plastic. However, it should be noted that other embodiments not enumerated here fall within the scope of the present subject matter.

FIG. 5illustrates a perspective view of the bottom of a plate102for a circuit carrier, in one embodiment of the present subject matter. Various features of the plate102are described in the discussion ofFIG. 4and are incorporated here.

In one embodiment, the plate includes a peg518. Varying embodiments use at least one peg518for registration, or spacing, or both. In embodiments which use the peg518for registration, a circuit carrier assembly includes at least two plates and at least one hinge. In various embodiments, the peg518is used to precisely align two plates. In one embodiment, the pegs are arranged in an asymmetrical fashion, such that the plates may only be mated in one manner. Additional embodiments use pegs which are symmetrically placed, allowing for the plates to be aligned in at least two ways.

In various embodiments of the present subject matter the pegs are approximately cylindrical, and in further examples they include a small taper. Various examples of pegs featuring a taper enable the plates to be mated accurately, even when the mating plates are initially misaligned. In one example, the taper of the peg518draws the plates into alignment as the plates are mated. Further embodiments include a peg518with a rounded tip. In various embodiments, a peg518with a rounded tip assists in fulfilling the various objectives of the peg, such as alignment or spacing.

Varying embodiments of the present subject matter use pegs which are capable of precision alignment. For example, in some embodiments, an assembly of at least two plates and at least one hinge is capable of obtaining a first level of dimensional precision, and the same assembly with pegs is capable of obtaining a second, improved level of dimensional precision.

In embodiments which use the peg518for spacing, there is no mating hole for the peg518to align to. Embodiments with use the peg518as a spacer include at least two plates, and at least one hinge, and when the plates are mated, the peg518provides for their precise spacing. In some embodiments, the peg518has a rubber tip to help absorb the shock created by mating plates. Additionally, a rubber tip can provide improved friction between the plate and the peg518, which, in one example, decreases the movement of the plate to which the peg518is attached relative to another plate.

Various embodiments which do not use the peg518for spacing or alignment use the peg518for other purposes, such as legs for a circuit carrying assembly to rest on. For example, one embodiment of the circuit carrier includes a plate which includes a set of legs which extend beyond other features of the plate, allowing the circuit carrier with an uneven shape to rest in a stable manner on a flat surface.

Varying embodiments of the plate102include a hold-down interface. In some embodiments, a plate with a hold-down interface includes a recess502. In various embodiments, the recess502is adapted to interface with a hold-down. Various embodiments of the recess502are designed to allow a keyed hold-down to mate with it. Some examples are designed to allow a keyed hold-down to further rotate after mating with the recess502. In one embodiment, the interior portion502includes a stop which is adapted to limit rotation of a keyed hold-down after the hold-down has been mated to the interface.

Varying embodiments of the plate102include an interior surface522. In various embodiments, the interior surface is adapted to mate with a circuit assembly.

FIG. 6illustrates a perspective view of the top of a plate104for a circuit carrier, in one embodiment of the present subject matter. In various embodiments, the plate104is adapted to mate with the plate102illustrated inFIG. 4andFIG. 5. Various features of the plate104are substantially similar to features included in the description of those figures, and are incorporated here by reference.

Various embodiments use the at least one peg621for stacking multiple circuit carrying assembles. For example, one embodiment of a circuit carrying assembly includes at least two plates and at least one hinge. Some examples of these embodiments mate the plates of a single circuit assembly carrier, and then stack multiple circuit assembly carriers unto one another. This can be useful whether or not a circuit assembly is disposed in the circuit carrier. In one example, stacking is accomplished by mating pegs621on a plate of a first circuit carrying assembly to openings on a plate of a second circuit carrying assembly. In further embodiments, this is accomplished by mating pegs621to other features. Various embodiments using pegs621for stacking may be stacked higher because of the use of pegs621.

Varying embodiments of the plate104include an exterior surface620. In various embodiments, the interior surface is adapted to mate with the exterior surface of another plate. In various embodiments, the plate104is plastic. However, it should be noted that other embodiments not enumerated here fall within the scope of the present subject matter.

FIG. 7illustrates a perspective view of the bottom of a plate104for a circuit carrier, in one embodiment of the present subject matter. Various features of the plate104are described in the discussion ofFIG. 6and are incorporated here. Varying embodiments of the plate104include an interior surface722. In one embodiment, the interior surface722is adapted to mate with the interior surface522, illustrated in one embodiment inFIG. 5.

Various embodiment of the present subject matter include ridges724. In various embodiments, ridges are used to allow particulates or fluid to pass between a circuit assembly mated to the plate104. In various embodiments, air passes through the ridges and between a circuit assembly mated to the plate104to cool the circuit assembly.

FIG. 8illustrates a perspective view of a hinge106, in one embodiment of the present subject matter. In varying embodiments, a circuit carrying assembly includes at least one hinge106. In some examples, a circuit carrying assembly includes two hinges106. Varying embodiments use other numbers of hinges.

In varying embodiments, a hinge106includes a socket802and a socket slot804. In various embodiments, the slot802is adapted to mate to compatible features on a plate. In various embodiments, the fit between a plate and the socket802is free, and in others it is an interference fit, and it still others, it is tuned to provide a desired level of friction. Varying embodiments also include features in the socket which allow the adjustment of the hinge106to the plate in measured increments. For example, in some embodiments, the socket802includes at least one recess, and the mating feature on a plate includes at least one raised feature compatible with each recess, such that rotation of the hinge106requires the hinge106or plate or both to elastically deform whenever the feature of the plate is not mated with a recess in the socket. This elastic deformation, in various embodiments, compels the hinge106to come to rest in a position where the at least one raised feature on the plate mate with a recess, in order to relieve elastic deformation. The overall result of using recesses in the socket802, in various embodiments, enables predetermined incremental adjustment.

In various embodiments, the hinge106includes a socket slot804. Varying embodiments of the socket slot are adapted to mate to a feature on a plate. For example, in some embodiments, a plate includes a boss which can deform to allow the installation of a hinge106. Varying embodiments of the hinge106are adapted to mate with a cylindrical boss. Mating the socket slot804with a cylindrical boss allows, in various embodiments, the hinge106to posses two substantial degrees of freedom; one being rotation of the hinge106around a mating boss, and another being an ability to slide the hinge106relative to the position of a mating feature. Varying embodiments of a circuit assembly carrier incorporating the socket slot804can accommodate manufacturing variance in dimensional tolerances as well as any dimensional variance which occurs due to heating. In various embodiments, the fit between a plate and the socket slot804is free, and in others it is an interference fit, and it still others, it is tuned to provide a desired level of friction.

Additionally, various embodiments of the hinge106enable connection of two plates, one to a socket802, and one to a socket slot804. Some examples of this assembly allow the two plates to be mated in a variety of ways. For example, in one embodiment, two plates may have a first set of major surfaces which mate, and, after being manipulated relative to the hinge106, can mate the surfaces opposed to the first set of major surfaces. Additionally, in some embodiments, one plate may not be able to rotate approximately 180 degrees relative to the hinge106, and as such, can rest angled to the plane of the other plate.

These are just examples of various embodiments of a hinge106with a socket802and a socket slot804, and these descriptions are not intended to be a complete list of the embodiments within the scope of the present subject matter. For example, in some embodiments, the hinge contains a boss, and the plates contain sockets. Various combinations of hinges and bosses are also within the scope of the present subject matter.

In various embodiments, the hinge106is plastic. However, it should be noted that other embodiments not enumerated here fall within the scope of the present subject matter.

FIG. 9illustrates a side view of a hinge106, in one embodiment of the present subject matter. The hinge106includes a socket802and a socket slot804, and further indicates a cross section illustrated inFIG. 10.

FIG. 10illustrates a front view of a cross section of the hinge106pictured inFIG. 9, in one embodiment of the present subject matter. The hinge106includes a socket802and a socket slot804. Additionally, in various embodiments, hinge includes a second socket1002, and a second socket slot1004. The cross section is offered to show that, for example, in one embodiment, the hinge includes material between the socket802and the second socket1002. However, in various embodiments, the socket802and the socket slot1002are connected by a common passage.

FIG. 11illustrates a top view of a hold-down108, in one embodiment of the present subject matter. Various embodiments of a hold-down108are attached to a plate, and varying embodiments partially enable interlocking a circuit assembly to a plate.

In varying embodiments, the hold-down108includes a barrel-shaped primary structure1104, attached to which are a first key1114, a second key1112, a third key1108, and a fourth key1120(hidden view). Further, in some embodiments, an elongated handle1106is attached to enable the hold-down108to be manipulated. In some embodiments, the barrel shaped primary structure1104is approximately cylindrical, and includes an approximately uniform diameter. Varying embodiments include a primary structure1104which includes more than one diameter. Some embodiments of the primary structure1104are not cylindrical. For example, in some examples, the barrel shaped primary structure1104is oval. Still other embodiments are cube shaped. It should be noted that the recitations here do not provide a complete list, and are offered only as an illustration. Embodiments not listed here fall within the scope of the present subject matter.

Varying embodiments of the present structure are adapted to mate with a circuit assembly carrier. For example, in one embodiment, a plate includes an interface adapted to mate to the circuit hold-down108. Varying embodiments of a plate include keyed access, and in some embodiments, the keyed access is adapted to constrain the hold-down108following manipulation of the hold-down108after insertion. For example, in one embodiment, a keyed hold-down108adapted for rotary manipulation is aligned with and inserted into a keyed access in a circuit carrier, and an associated interface. In one embodiment, key1114is positioned to permit inserting the hold-down108into a circuit carrier interface which includes an opening shaped similar to the profile created by the approximate combination of the primary structure1104and the key1114, as illustrated inFIG. 11. However, other key shapes fall within the scope of the present subject matter, and it should be understood that those enumerated here are offered only as illustration of one embodiment of the present subject matter. Varying examples use key1112to interlock a circuit assembly.

Once inserted, in various embodiments, a hold-down108may be rotated, such that the key passes into recesses located within the interface, putting the key out of alignment with the opening in the circuit carrier. Because the key is out of alignment with the circuit carrier, in various embodiments, the hold-down108in substantially constrained from separation from the plate. However, in embodiments which include recesses adapted for rotation, the hold-down108may continue to be manipulated in a rotary motion, without providing for the removal of the hold-down108from the interface. In some embodiments, features are available which prevent the hold-down108from realigning with the openings, and providing for removal.

For example, in varying embodiments, once rotated, features in the hold-down108and circuit carrier assembly prevent extraction of the hold-down108. Various embodiments include features which require that the hold-down108be forced past a locking feature which resists rotary movement. In other words, in one embodiment, a user must exert an initial force which is greater than the force normally required rotate an installed hold-down108, in order to position the hold-down108past a locking position and into a normal-use position. In one embodiment, a raised portion1118on the key1114must pass a mating feature in the interface, and the initial force required by the user moves the raised portion past a mating feature. In various examples, once the raised portion is rotated past a mating feature, the hold-down108may be manipulated by normal forces. Overall, these embodiments include locking features which resist manipulation of the raised portion1118past its mating feature, but otherwise allow movement of the hold-down108.

In various embodiments, features of the first plate and features of the second plate are located such that when the two plates are mated, the features are aligned, so that a hold-down can mate with the first plate or the second plate without substantially changing the location of its center axis.

Various embodiments of the present subject matter include identification markings which can assist in the use of a hold-down108. For example, first marking1102can be aligned with a mating feature to communicate information to a user, such as position. For example, marking “A” indicates attachment to the first plate, and marking “B” indicates attachment to the second plate, and marking1102can be used to indicate whether the hold-down is aligned with “A” or “B”. In various embodiments, the first marking1102is adapted for use in optical systems which inspect the hold-down108position and communicate position information to other areas of a manufacturing process. Similarly, a second marking1110, also communicates information to other process components.

In various embodiments, a circuit carrier includes a first plate mated to a second plate and two hold-downs. In such embodiments, the plate cannot be separated unless each hold-down is positioned correctly, as indicated by the marking1102. One benefit of a design which requires that two hold-downs be coordinated is that the first hold-down may not be manipulated to interlock the circuit assembly to one plate, while the second hold-down is manipulated to interlock the circuit assembly to the second plate, thereby imparting a stress on the circuit assembly when the plates are separated. Additional embodiments use an external link to connect two hold-downs to ensure they are in a coordinated position.

In various embodiments, the elongated handle1106is sized to provide for rotary manipulation of the hold-down108with a user's finger. In examples designed for finger use, various features are included, such as a concave shape including a radius compatible with a fingertip. Varying embodiments also include textures which are easy to grasp. Still further embodiments include other features, like raised bumps or ridges.

Various embodiment of the elongated handle also include features which are adapted to work with process machinery. For example, in various embodiments, a handle is attached to the hold-down108which allows a machine to interface with the hold-down108and rotate it. Various embodiments of a handle might include optical markings, or other features suited to enable a machine to locate and manipulate the hold-down108.

In varying embodiments of the present subject matter, once the hold-down108is inserted into an interface, it is rotated. Varying embodiments include chamfers1116which round the edges of the hold-down keys to enhanced rotation. In various embodiments, rounded edges include less sharp elements which can catch on portions of a plate.

In various embodiments, the hold-down108is plastic. However, it should be noted that other embodiments not enumerated here fall within the scope of the present subject matter.

FIG. 12Aillustrates a perspective view of a hold-down108, in one embodiment of the present subject matter. The hold-down108is similar to the embodiment illustrated inFIG. 11, and various features of that discussion are incorporated into this discussion. For example, the hold-down108includes a marking feature1102, a primary structure1104, an elongated handle1106, a key1108, a second marking feature1110, a second key1112, a first circuit interface key1114, chamfers1116, a locking feature1118, and a second circuit interface key1120.

FIG. 12Billustrates a perspective view of a hold-down108, in one embodiment of the present subject matter. The hold-down includes first stop1202, and a second stop1203. One or both of either the first stop1202or the second stop1203are useful for distributing fingertip pressure, in various embodiments.

Additionally, one or both of the first stop1202and the second stop1203are useful for limiting rotational movement in a circuit carrier, in various embodiments. The hold-down108is similar to the embodiment illustrated inFIG. 11, and various features of that discussion are incorporated into this discussion. The hold-down108includes a marking feature1102′, a primary structure1104′, an elongated handle1106′, a key1108′, a second marking feature1110′, a second key1112′, a first circuit interface key1114′, chamfers1116′, and a second circuit interface key1120′.

FIG. 13illustrates a perspective view of the top of a clasp112, or sliding lock, in one embodiment of the present subject matter. Varying embodiments of the carrier of the present subject matter include at least one clasp. For example, in varying embodiments, the clasps are attached to a plate in a manner which resists disconnecting the clasp from the plate, but allows the clasp to be manipulated to both lock and unlock the clasp, which secures, or releases, respectfully, the plates of the circuit carrier from their mated position. In one embodiment, the circuit carrier100pictured inFIG. 1includes two clasps.

One embodiment of the present subject matter includes a depression1302adapted to mate with a person's finger and provide a surface contour which resists finger movement. In other words, a finger pushing against a depression1302can move the clasp. In various embodiments, the claps includes a raised feature1304which also resists finger movement, such that a force applied by a finger moves the clasp. Some embodiment include rounded contours which assist a user in grasping the clasp. For example, if the clasp were not rounded, touching it could cause an operator pain.

It should be noted that in various embodiments other features can be present on the surface of the clasp. For example, in one embodiment, a feature is present and available as a means to enable a machine to mate with the clasp and move the clasp. Further, in some embodiments, the clasp includes features which allow optical devices, such as cameras, to record the location of the clasp and ensure that the clasp is in a proper position. One embodiment includes features adapted to allow finger movement, machine movement, and optical detection of clasp position.

Various embodiments of the clasp include a feature which allows attaching the clasp to a plate in a semi-permanent way. For example, in one embodiment, the clasp includes a first channel1306adapted for mating with a plate. In various embodiments, the first channel1306includes at least one tine1308which may be deformed, in combination with deformation of the clasp, as the clasp is attached to a plate. Some examples feature elastic deformation. Varying examples allow the clasp to resume its normal, non-elastically deformed state after it is connected to the plate.

In various embodiments, the first channel1306is sized larger than the mating feature on a plate, such that the clasp may slide freely along the plate. In further embodiments, the fit between the clasp and a plate is tuned to add friction, or force the clasp or plate to deform during manipulation, such that the clasp is not free to move, but rather requires at least some force to undergo movement. In one embodiment, the mating surface on the plate includes a series of features which allows for a variable resistance to movement as the clasp is manipulated. For example, in one embodiment, by varying the interface between the first channel1306and a plate, the clasp mechanism may provide feedback through an operator's manipulation of the clasp. Feedback is useful, in varying embodiments, for indicating position of the clasp relative to the plate. For example, feedback can be used to communicate to an operator that the clasp is fully constraining two plates, is not constraining two plates at all, or is somewhere in between these two parameters.

In various embodiments, the clasp is molded out of plastic. In other embodiments, the clasp is made from metal. Various embodiments provide for a clasp which is composed of other materials not enumerated here. Further, in various embodiments, the clasp is provided with surface texture which causes fricative resistance with other surfaces which contact it.

FIG. 14illustrates a perspective view of the bottom of a clasp112, in one embodiment of the present subject matter. In various embodiments, a clasp includes a first channel1306, as discussed above in description related toFIG. 13. Varying embodiments of the clasp also include a second channel1410. In part, the second channel1410may be formed by including a raised portion1412, in various embodiments. For example, in some embodiments, a first channel1306provides a means for mating the clasp to one plate, and a second channel provides the means for mating the clasp to a second plate.

In one embodiment, the second channel may be shaped such that the movement of the clasp relative to plate features adapted to mate to the second channel1410causes the clasp to require increasing force as it is moved. For example, in one embodiment, the second channel1410can include a taper, and a mating feature a raised portion, such that as the clasp requires increasingly more force as the taper slides past the raised portion. In varying embodiments, the taper can also include a relief, such that upon sliding the clasp a set distance, a raised feature in the mating plate is provided a relief. The net effect of such an embodiment is both that a feedback is provided to the user which indicates that the clasp is in proper position, and that a raised feature mated with a relief provides a lock which resists further movement of the clasp.

In various embodiments, any friction between the clasp112and a plate is provided by either surface friction, or a combination of surface friction and deformation of the clasp and/or plate. Various embodiments also employ varying features to induce friction, such as lubricants of a tuned lubricity which, when deposited between the clasp and a plate, resist movement of the clasp relative to the plate.

FIG. 15illustrates a method1500for using a circuit carrier, in one embodiment of the present subject matter. In various embodiments, a circuit assembly is placed on a first plate1502. In some examples, a hold-down is used to interlock the circuit assembly to the first plate1504. Varying embodiments close the second plate onto the first plate and use a lock or clasp to secure the first plate to the second plate, with the circuit assembly being disposed between the first plate and the second plate1506. In some embodiments, when the first plate and the second plate are secured with a circuit assembly disposed between them, assembly and inspection procedures are performed on the circuit assembly1508. Varying embodiments require a process to decide whether it would be helpful to use the lock to release the first plate from the second plate in order to perform additional inspection or assembly1510. In embodiments which do not require using the lock to release the first plate from the second plate in order to perform additional inspection or assembly1510, the process inquires whether the circuit assembly requires any further assembly and inspection1518. In one example, further assembly and inspection includes using apertures in the plate to inspect the circuit assembly. If the circuit assembly does not require additional assembly and inspection, the circuit assembly may be released from the circuit carrier1520.

In embodiments including additional assembly and inspection1510, a hold-down is set to interlock the circuit assembly to one of a group including the first plate and the second plate1512. Additionally, in some embodiments, the lock may be released to allow assembly and inspection of the circuit assembly1514. By allowing the process to choose to interlock the circuit assembly to either the first plate or the second plate, the process can inspect both sides of a circuit assembly without separating the circuit assembly from the circuit carrier.

Once any assembly and inspection is performed on the circuit assembly, the lock is set to secure the first plate to the second plate, with a circuit assembly disposed between them1516, in various embodiments of the present subject matter. Varying embodiments then use the process to decide whether the circuit assembly needs additional assembly and inspection1518. In embodiments where it does, the process returns to a state where assembly and inspection are performed1508. In embodiments where it does not, the process releases the circuit assembly from the circuit carrier1520, for use by other processes.

FIG. 16illustrates a method1600of holding a circuit assembly, according to one embodiment of the present subject matter. For example, block1602represent a zero state which includes a circuit carrier with a first plate and a second plate, attached by a hinge. In various embodiments, the first and second plates are not mated in together in block1602. In block1604, in various embodiments of the present subject matter, the first and second plates are not mated in state2. However, in block1604, a circuit assembly is attached to a first plate. In various embodiments, a circuit assembly is interlocked to the first plate with a hold-down. Block1606includes state3, in which the circuit assembly is attached to a second plate in state3. In various embodiments, in state3, the circuit assembly is attached to the second plate using a hold-down. State1of block1610includes a mated first and second plate, with a circuit assembly disposed between the first and second plate. In various embodiments, in state1, the plates are locked together with a clasp or other type of mechanism which secures the first plate to the second plate.

In various embodiments, through the course of circuit assembly and inspection, the method which traverses states0-3, according to method1600, is useful for manipulating the circuit carrier and the circuit assembly. For example, in one embodiment, a user can move from block1602, to block1604to inspect a first side of a plate, to block1603to manipulate a hold-down to release the circuit assembly from being interlocked to the first plate, and to interlock the circuit assembly to the second plate, and then to block1606, to inspect a second side of the circuit assembly. Various other combinations of the steps of method1600are within the scope of the present subject matter, and the description here, used for illustration, should not be interpreted as limiting.