ELECTRONIC DEVICE AND MAGNETIC LATCHING MECHANISM THEREFORE
A magnetic latch for a display of a laptop computer is disclosed. The latch uses magnetic attraction to maintain the display closed and uses magnetic repelling forces to pop-up the display when opened. The latch includes one or more magnetic elements in the body of the laptop and at least one magnetic element in the display. When the display is closed, the magnet element in the display is positioned adjacent the magnet element in the body having an opposite polarity so that the magnet elements are attracted to one another. To pop-up the display, the user moves the magnetic element in the display so that it meets the magnetic pole in the body having the same polarity. When these meet, the repelling force between them causes the display to open slightly so that a user can then readily open the display.
This application is a continuation of U.S. application Ser. No. 11/302,907, filed 13 Dec. 2005, which is incorporated herein by reference, to which priority is claimed, and which was filed concurrently with U.S. patent application Ser. No. 11/302,801, which is incorporated herein by reference in its entirety.
FIELD OF THE DISCLOSUREThe subject matter of the present disclosure generally relates to a latch for a laptop computer and more particularly relates to a magnetic latch for a laptop computer that uses magnetic attraction to keep the display closed and uses magnetic repulsion to pop-up the display for opening.
BACKGROUND OF THE DISCLOSURELaptop or network computers have a body housing internal components and have a display attached to the body. The display is typically hinged to the body so that the display can be opened and closed relative to the body. In the past, mechanical latches have been used on laptop displays to maintain the display closed against the body. The latch mechanisms typically have a hook and catch interlock or similar arrangement that is activated using a button, slider, or the like. To open the display, a user disengages the hook and catch mechanism and then pivots the display on its hinges open from the body. Once the latch is disengaged, the user must pry open the display by hand.
It is known in the art to use a magnet with a hook and catch interlock. Referring to
To facilitate opening of the display 14, it is known in the art to use a counterbalance clutch 20 at the hinge of the display 14 and body 12. To produce the counterbalance clutch 20, thrust washers, Omega clips, or bands are typically located at the hinge(s) between the display 14 and body 12. When the display 14 is closed and locked against the body 12 with the latch mechanism 30, the display 14 acts against the counterbalance clutch 20 so that the locked display 14 is biased to open. When the latch mechanism 30 is released, the existing bias in the display 14 is released, causing the display 14 to pop-up or open slightly from the body 12. A typical clutch/display weight threshold is about 400-grams. The pop-up of the display 14 then allows a user to fit a portion of a finger under the edge of the display 14 to help them better pry the display 14 open. Displays 14 with counterbalanced clutches 20 are typically referred to as “pop-up displays.”
Unfortunately, several structural issues with prior art hook and catch interlocks and counterbalance clutches pose problems for designers of laptop computers. Although these prior art mechanisms are effective, they are susceptible to breakage. For example, a hook, catch, or spring of a latch mechanism can break simply through use, rendering the display incapable of being locked closed. If a hinge between a display and a body has been slightly damaged, portions of a latch mechanism may be misaligned and not work properly. In addition, portions of the latch mechanism such as the hook may be exposed on the display or the body after opening and can be broken inadvertently.
Likewise, structural issues with prior art counterbalance clutches pose problems for laptop designers. The counterbalance clutches are typically located at the one or more hinges between the display and the body. To produce the pop-up, these clutches are biased or loaded when the display is closed against the body. Thus, the clutches have built in stresses that can cause failure over time. These clutches can also be damaged if the display is inadvertently moved relative to the body in unwanted directions. For example, when the display is closed and the clutches are loaded, any injury to the hinge area by dropping the laptop can damage the clutch and/or hinges.
Therefore, a need exists for a latch of a laptop display that overcomes structural issues inherent with the mechanical hook and catch mechanism found in the art. In addition, a need exists for a pop-up display that overcomes structural issues inherent with the counterbalance clutches found in the art. The subject matter of the present disclosure is directed to overcoming, or at least reducing the effects of, one or more of the problems set forth above.
SUMMARY OF THE DISCLOSUREA magnetic latch for a display of a laptop computer is disclosed. The latch uses magnetic attraction to maintain the display closed. The latch also uses magnetic repelling forces to pop-up the display when a user wants to open the laptop. In one embodiment, the latch includes at least one first magnetic elements positioned in the body of the laptop and includes at least one second magnetic element positioned in the display. The first magnet element in the body is arranged so that opposite polarities are positioned towards the second magnet element in the display. When the display is closed, the second magnet element in the display is positioned adjacent the first magnet element in the body having the opposite polarity to that the first and second magnet elements are attracted to one another. To pop-up the display, the user moves (e.g., slides, turns, pushes, rotates, flips) the second magnet element in the display so that it meets the first magnet element having the same polarity. When these meet, the repelling force between them causes the display to open an amount that allows the user to then readily open the display. In one embodiment, the first and second magnetic elements can both be permanent magnets. In an alternative embodiment, one or more of the first magnetic elements can be electromagnets while the second magnetic element can be a permanent magnet.
The foregoing summary is not intended to summarize each potential embodiment or every aspect of the present disclosure.
The foregoing summary, preferred embodiments, and other aspects of subject matter of the present disclosure will be best understood with reference to a detailed description of specific embodiments, which follows, when read in conjunction with the accompanying drawings, in which:
While the disclosed latch and pop-up mechanisms are susceptible to various modifications and alternative forms, specific embodiments thereof have been shown by way of example in the drawings and are herein described in detail. The figures and written description are not intended to limit the scope of the inventive concepts in any manner. Rather, the figures and written description are provided to illustrate the inventive concepts to a person skilled in the art by reference to particular embodiments, as required by 35 U.S.C. §112.
DETAILED DESCRIPTIONReferring to
The electronic device 10 has a latch and pop-up mechanism 50 according to certain teachings of the present disclosure. In the present embodiment, the disclosed mechanism 50 achieves latching of the display 14 to the body 12 and achieves pop-up of the display 14 from the body 12. Although shown slightly open in
The disclosed mechanism 50 includes a first component 60 positioned on the body 12 and a second component 70 positioned on the display 14. As best shown in the front view of
The movable element 72 is magnetically attracted to the first magnetic element 62 when the display 14 is closed against the body 12 and the movable element 72 has the closed state (i.e., when slid to the right position in
In one embodiment, the first magnetic element 62 is composed of a ferromagnetic material, and the second magnetic element 64 is a permanent magnet. For example, the ferromagnetic material can be steel, and the permanent magnet can be a rare earth permanent magnet. The permanent magnet 64 has a first polarity (e.g., North polarity) relative to the display 14. In this embodiment, the movable element 72 is a permanent magnet having an opposite polarity (e.g., South polarity) to that of the second magnetic element 64. In this way, the movable element 72 in the closed state (e.g., right position) is attracted to the ferromagnetic material 62 to maintain the display 14 closed. When the user moves the movable element 72 to the open state (e.g., left position), the movable element 72 is repelled by the permanent magnet 64 on the body 12, which causes the display 14 to pop-up a distance from the body 12.
In another embodiment, the first magnetic element 62 is a permanent magnet having a first polarity (e.g., North polarity), and the second magnetic element is a permanent magnet having an opposite polarity (e.g., South polarity) to the first polarity. In this embodiment, the movable element 72 is a permanent magnet having the same polarity (e.g., North polarity) as the first polarity of the first element 62. In this way, the movable element 72 in the closed state (e.g., right position) is attracted to the first permanent magnet 62 to maintain the display 14 closed. Likewise, the movable element 72 in the open state (e.g., left position) is repulsed by the second permanent magnet 64 to make the display pop-up a distance from the body 12.
Table 1 below provides repulsion values in grams at various distances for various combinations and sizes of rare earth permanent magnets.
For example, in the sixth combination of Table 1, the top magnet is 5.0×4.5×48-mm in dimension, while the bottom magnet is 5.0×2.0×48-mm in dimension. When arranged vertical to one another with the same polarities to produce repulsion (i.e., with only one pole of each magnet positioned relative to the same pole of the other magnet), the top and bottom magnets exhibit repulsion values of 445, 705, and 1174-grams at the distances of 6.55-mm, 5.0-mm, and 3.5-mm, respectively. On the other hand, these same top and bottom magnets arranged horizontally with the same polarities to produce repulsion (i.e., with both poles of each magnet positioned relative to the same poles of the other magnet) exhibit greater repulsion values of 528, 807, and 1316-grams at the distances of 6.55-mm, 5.0-mm, and 3.5-mm, respectively.
Table 2 below provides attraction values in grams at various distances for the same combinations and sizes of rare earth permanent magnets of Table 1.
For example, in the sixth combination of Table 2, the top and bottom magnets arranged vertical to one another with opposing polarities to produce attraction exhibit attraction values of 1209 and 2368-grams at the distances of 3.2-mm and 1.7-mm, respectively. On the other hand, these same top and bottom magnets arranged horizontally with opposing polarities have greater attraction values of 1302 and 2539-grams at the distances of 6.55-mm and 3.5-mm, respectively. Given the data available in Tables 1 and 2, it is preferred that the embodiment of the magnetic latch and pop-up mechanism 50 having permanent magnets for each of the magnetic elements 62, 64, and 74 use a horizontal arrangement of the poles of the magnet.
From a mechanical standpoint, it may be desirable to select the sizes of magnets that produce the most repulsive and attractive forces. However, from a design standpoint, there may be limitations on the size of the permanent magnets that can be used due to space limitations in the device 10 and magnetic flux limitations from the magnets, along with other considerations discussed later. In addition, design of the disclosed magnetic latch and pop-up mechanism for a laptop computer preferably considers a number of practical mechanical issues, such as the ability to keep the display closed even if the laptop is dropped.
In the embodiment of the disclosed mechanism in
In the embodiment of the disclosed mechanism in
In another embodiment of the disclosed mechanism shown in
In yet another embodiment of the disclosed mechanism shown in
As each of the embodiments of the disclosed mechanism shown in
In the embodiment of the disclosed mechanism shown in
Referring to
As best shown in the side view of
As further shown in the side view of
In one potential problem, magnetic flux from the magnetic components 60 and 70 may interfere with the electronic components 11, 13, and 15 of the laptop 10. It is calculated that embodiments of the disclosed mechanism 50 may produce 0.2 Tesla of magnetic flux when the display 14 is closed and that the magnetic flux may affect an area of about 2-3-cm within of the laptop 10. To overcome potential interference, magnetic flux from the magnetic components 60 and 70 can be localized to prevent affecting the electronic components 11, 13, and 15. In one example, the magnetic components 60 and 70 can be physically separated as far as possible from the electronic components 11, 13, and 15 to prevent interference. In other examples, techniques known in the art for shunting and shielding the magnetic components 60 and 70 can be employed.
In addition to magnetic effects, design of the disclosed mechanism 50 preferably considers the amount of movement required to move the magnetic components 60 and 70 between attraction to repulsion. Furthermore, design of the disclosed mechanism 50 preferably considers the amount of repulsive force to sufficiently pop-up the display 14. Given these design considerations, it is preferred to divide the magnetic components 60 and 70 into a plurality of discrete magnetic elements. In a preferred embodiment, latch travel to produce the open and closed states is preferably about 25-mm or less. In this preferred embodiment, a plurality of discrete neodymium magnets are arranged in a line and given alternating polarity, as will be discussed in further detail below.
Referring to
As before, a button 152 slideably positioned in a slot 151 defined in the housing of the display 14. The button 152 has a portion 154 connected to the second magnetic component 170. A user slides the button 152 in the slot 151 to move the magnetic component 170 relative to the second magnetic component 160. Each of the permanent magnets 162, 164, 172, 174 is preferably a neodymium N-48 magnet, and each component 160 and 170 preferably defines approximately 25-mm of active magnetic length.
As shown in
It is preferred that the pop-up distance DP is about 4.8-mm, which combined with a pre-existing G of about 1.5-mm shown in
As shown in the cross-section of
There are various numbers and orientations of magnets and ferromagnetic elements that can be used for the magnetic components of the disclosed latch and pop-up mechanisms. Referring to
The first component 200 has a plurality of first magnetic elements 202, 204 with a first polarity configuration, and the second component 210 has a plurality of second magnetic elements 212, 214 with a second polarity configuration. The first magnetic elements 202, 204 include six permanent magnets 202 and a ferromagnetic element 204 (e.g., composed of steel) arranged in a line. These permanent magnets 202 are arranged with their poles having a horizontal and alternating polarity configuration. Conversely, the second magnetic elements 212, 214 include a ferromagnetic element 214 (e.g., composed of steel) and six permanent magnets 212 arranged in a line. These permanent magnets 212 are also arranged with their poles having a horizontal and alternating polarity configuration.
The polarity configuration of the first component 200 is arranged to be attracted to the polarity configuration of the second component 210 when the two components 200 and 210 are substantially aligned (e.g., distance D2 is substantially zero), as shown in
In one embodiment, the first magnetic elements 202, 204 each have dimensions (X, Y2, Z) of about 4, 2, and 5-mm, and the second magnetic elements 212, 214 each have dimensions (X, Y1, Z) of 4, 4, and 5-mm. In addition, the first magnetic component 200 has a distance D1 of about 1.7-mm from the second magnetic component 210 when the display and body are closed. To achieve pop-up, the components 200, 210 are moved relative to one another by a distance D2 in
Referring to
The different polarity configurations disclosed above with reference to
In a first polarity configuration 301, a first (upper) permanent magnet has vertically arranged poles, and a second (lower) permanent magnet also has vertically arranged poles. As shown, the vertically arranged poles of the magnets can be arranged for attraction (A) and repulsion (R). In second polarity configuration 302, both upper and lower permanent magnets have horizontally arranged poles, and the horizontally arranged poles can be arranged for attraction (A) and repulsion (R).
In a third polarity configuration 303, two upper permanent magnets have a shunt composed of ferromagnetic material, and each upper magnet has vertically arranged poles that are oppositely oriented from the other. These two upper permanent magnets are repulsed by two lower permanent magnets also having a shunt and vertically arranged poles. As shown, the upper and lower magnets with shunts can be arranged for attraction (A) and repulsion (R).
In a number of other polarity configurations 304, 305, 306 either the upper or the lower element is a ferromagnetic material (e.g., steel), and the other element has one or more permanent magnets with any number of pole arrangements. These polarity configurations 304, 305, and 306 can be arranged for attraction (A).
It will be appreciated that these polarity configurations are not exhaustive and that additional configurations may be possible. For example, additional polarity configuration can be used that have switched arrangement of magnetic elements or switched orientations of magnetic poles from this illustrated in
Referring to
The electromagnet 410 operates in an energized condition to produce an open state and in an unenergized condition to produce a closed state. In the unenergized condition, internal electronics (not all shown), which includes a switch 418 for connecting the coil 414 to the battery 416, cause the electromagnet 410 to be disconnected from the battery 416. Thus, the permanent magnet 420 on the display 14 is magnetically attracted to the ferromagnetic material of the core 412 and can maintain the display 14 closed against the body 12.
To produce the energized condition, the user pushes an external button 401 to activate the internal electronics (such as switch 418) and to connect the coil 414 to the battery 416. Current is supplied to the coil 414 to energize the core 412. When energized, the electromagnet 410 produces a polarity opposite to that of the permanent magnet 420 in the display 14 and causes the magnet 420 to be magnetically repulsed by the energized electromagnet 410. The repulsion thereby causes the display 14 to pop-up a distance to allow the user to open the display 14.
In the embodiments of the disclosed latch mechanisms of
After pop-up, the magnet 72 may remain in the open state, and the user can open the display 14 from the body 12. During closing, the user pushes the display 14 against the body 12, and the magnets 72 and 64 are brought into proximity to one another. The repulsive and attractive forces between all the magnets 62, 64, and 72 will cause the movable magnet 72 to move to the closed state as the display 14 is closed against the body 12. Consequently, embodiments of the movable element 70 can reset from the open to closed state.
Even after pop-up shown in
If the attractive force A2 at distance DP in
In
In
In one embodiment, the mechanical catch 510 may need to be disengaged by the user for the movable element 70 to return to the closed state for closing the display 14. Alternatively, the mechanical catch 510 may be automatically disengaged by the tendency of the movable element 70 to return to the closed state as the user pushes the display 14 ever closer against the body 12. For example, the magnetic forces between the magnet 72 and 64 increase as the distance between the magnets decreases (usually exponentially). At some point when the display 14 is close to the body 12 (preferably at a distance less than the pop-up distance Dp), the magnetic forces R and A2 will cause the button 52 to overcome the force of the catch 510, and the movable element 70 will automatically reset in the closed state.
The foregoing description of preferred and other embodiments is not intended to limit or restrict the scope or applicability of the inventive concepts conceived of by the Applicants. In exchange for disclosing the inventive concepts contained herein, the Applicants desire all patent rights afforded by the appended claims. Therefore, it is intended that the appended claims include all modifications and alterations to the full extent that they come within the scope of the following claims or the equivalents thereof.
Claims
1-44. (canceled)
45. A latching apparatus for hingedly connected bodies, comprising:
- a first component disposed on a first of the bodies and comprising at least one permanent magnet having a first polarity configuration; and
- a second component disposed on a second of the bodies and comprising an electromagnet having an unengergized condition and an energized condition;
- wherein to maintain the first body closed against the second body, the first and second components are magnetically attracted to one another when the second component has the unenergized condition, the electromagnet in the unenergized condition allowing the at least one permanent magnet of the first component to magnetically attract to material of the second component; and
- wherein to automatically move the first body at least partially open a separation distance from the second body, the first and second components are magnetically repellable from one another when the second component has the energized condition, the electromagnet in the energized condition producing a second polarity configuration magnetically repelling the first polarity configuration of the at least one permanent magnet of the first magnetic element and moving the first and second components apart at least by the separation distance.
46. The apparatus of claim 45, wherein the electromagnet comprises ferromagnetic material, and wherein the permanent magnet magnetically attracts to the ferromagnetic material of the electromagnet when in the unenergized condition.
47. The apparatus of claim 45, further comprising means for selecting between the energized and unenergized conditions of the second component.
48. The apparatus of claim 45, further comprising a power source operatively coupled to the electromagnet for energizing the electromagnet.
49. The apparatus of claim 48, further comprising a switch operatively connected between the power source and the electromagnet and controlling the energization of the electromagnet thereby.
50. The apparatus of claim 45, wherein the separation distance overcomes the magnetic attraction between the first and second components when the second component has the unenergized condition.
51. The apparatus of claim 45, wherein the separation distance permits manual prying of the first and second bodies apart from one another.
52. The apparatus of claim 45, wherein the first component comprises a first magnetic strength, and wherein the second component produces a second magnetic strength greater than the first magnetic strength.
53. The apparatus of claim 45, wherein the apparatus comprises an electronic device having the first and second bodies hingedly connected together.
54. The apparatus of claim 53, wherein the electronic device is selected from the group consisting of a laptop computer, a portable CD player, a portable DVD player, a PDA, a calculator, and a cell phone.
55. The apparatus of claim 53, wherein the first body comprises a display of a laptop computer, and wherein the second body comprises a body of the laptop computer having the display hingedly connected thereto.
56. An electronic device, comprising:
- a first body;
- a second body hingedly connected to the first body;
- a first component disposed on the first body and comprising at least one permanent magnet having a first polarity configuration; and
- a second component disposed on the second body and comprising an electromagnet having an unengergized condition and an energized condition;
- wherein to maintain the first body closed against the second body, the first and second components are magnetically attracted to one another when the second component has the unenergized condition, the electromagnet in the unenergized condition allowing the at least one permanent magnet of the first component to magnetically attract to material of the second component; and
- wherein to automatically move the first body at least partially open a separation distance from the second body, the first and second components are magnetically repellable from one another when the second component has the energized condition, the electromagnet in the energized condition producing a second polarity configuration magnetically repelling the first polarity configuration of the at least one permanent magnet of the first component and moving the first and second components apart at least by the separation distance.
57. The device of claim 56, wherein the electronic device is selected from the group consisting of a laptop computer, a portable CD player, a portable DVD player, a PDA, a calculator, and a cell phone.
58. The device of claim 56, wherein the first body comprises a display of a laptop computer, and wherein the second body comprises a body of the laptop computer having the display hingedly connected thereto.
59. The device of claim 56, further comprising means for selecting between the energized and unenergized conditions of the second component.
60. The device of claim 56, further comprising a power source operatively coupled to the electromagnet for energizing the electromagnet.
61. The device of claim 60, wherein the power source comprises a battery separate from a source of power for the electronic device.
62. The device of claim 60, wherein the power source comprises a battery being a source of power for the electronic device.
63. The device of claim 56, further comprising a switch operatively connected between the power source and the electromagnet and controlling the energization of the electromagnet thereby.
64. The device of claim 56, wherein the separation distance overcomes the magnetic attraction between the first and second components when the second component has the unenergized condition.
65. The device of claim 56, wherein the first component comprises a first magnetic strength, and wherein the second component produces a second magnetic strength greater than the first magnetic strength.
66. The device of claim 56, wherein the first body comprises a first edge, and wherein the separation distance permits engagement of the first edge to manually pry the first and second bodies apart from one another.
67. A method of opening an electronic device, comprising:
- providing first and second bodies of the electronic device hingedly connected together;
- maintaining the first and second bodies closed together by— deenergizing a first component on the first body, and magnetically attracting the first component to a second component on the second body; and
- at least partially opening the first body a separation distance from the second body by— energizing the first component with a first polarity, and magnetically repelling the first polarity of the first component from a second polarity of the second component.
Type: Application
Filed: Jul 7, 2010
Publication Date: Feb 3, 2011
Inventors: Chris Ligtenberg (San Carlos, CA), Brett Degner (Menlo Park, CA)
Application Number: 12/831,505
International Classification: H05K 5/00 (20060101); H01F 7/02 (20060101);