JP5472631B2 - Electronic device with display unit - Google Patents

Description

  The present invention relates to an electronic device such as a telephone having a display unit, and more particularly to an electronic device that can adjust the angle of a display unit steplessly.

Some electronic devices such as telephones are provided with a display unit including a display panel such as a liquid crystal display on the front surface. Usually, the display panel is in a horizontal position facing upward, but is displayed on the display panel. There is also known an electronic apparatus having a function capable of changing the posture of the display unit from a horizontal posture to an inclined posture so that the information can be easily seen (for example, Patent Document 1).
The electronic device disclosed in Patent Document 1 includes a display unit that is rotatably attached to the device body, and an angle adjustment device that can hold the display unit at a predetermined inclination angle. The angle adjusting device includes a rib as a support leg extending downward from the bottom surface of the display unit, and a slide member provided on the apparatus main body and capable of engaging and supporting the rib at a predetermined position of the rib. Specifically, the rib is provided with a plurality of convex portions at intervals in the vertical direction, and the slide member engages with the predetermined convex portion of the rib, whereby the display unit is a device main body. Is maintained at a predetermined inclination angle.

By the way, such an angle adjusting device has a large number of parts, which causes a reduction in manufacturing efficiency of electronic equipment and an increase in manufacturing cost. Further, in this angle adjusting device, the tilt angle of the display unit can only be adjusted stepwise, and the tilt angle of the display unit cannot be adjusted arbitrarily, that is, steplessly.
Here, for example, an electronic device disclosed in Patent Document 2 is known as one aspect of an electronic device that can adjust the tilt angle of the display unit steplessly. This electronic device includes a display unit that is pivotally supported by a casing, and a circular arc-shaped rib is formed integrally on the bottom surface of the display unit, while a rib is formed on the casing side. A braking piece made of rubber material press-fitted in between is provided. The display unit is held at an arbitrary inclination angle by a frictional force generated by contact between the rib and the braking piece, that is, a holding force. In the case of such an electronic device, the user can adjust the display unit to an arbitrary inclination angle by raising and lowering the display unit against the holding force.

  Here, the operability of the raising / lowering operation of the display unit depends on the magnitude of the holding force. That is, the stronger the holding force, the harder it is to perform the undulation operation, and the weaker the holding force, the easier the undulation operation. In addition, in the case of the electronic device of patent document 2, the strength of the holding force is constant in both the undulations of the display unit.

JP 2005-176197 A JP 2000-124620 A

  By the way, in recent years, electronic devices of this type have been reduced in size as a whole, while the display unit has been increased in size to display more information and to make the displayed information easier to see. Tend to. For this reason, the weight of the display unit itself is increased, and due to this influence, the display unit is easily tilted toward the horizontal posture. Therefore, in order to stably maintain the angle of the display unit, it is necessary to increase the strength of the holding power of the display unit.

Further, along with the enhancement of functions of the display unit, an operation button is attached to the display unit itself, and electronic devices of a type provided with a touch panel instead of the display panel have also been developed. In the case of such an electronic device, when an operation button or a touch panel is pressed, a force is applied in the direction of tilting the display panel. Therefore, it is desirable to further increase the strength of the holding force.
However, when the holding force is increased as described above, the display unit particularly has a problem that it is difficult to operate in the direction that causes the display unit.

  The present invention has been made based on the above-described circumstances, and the object thereof is a simple mechanism that is sufficient for changing the posture of the display unit in a direction in which the inclined posture is lowered to the horizontal posture. To provide an electronic device with a display unit that exhibits a holding force, weakens the holding force against a change in the posture of the display unit from a horizontal posture to an inclined posture, and can easily cause the display unit with a small force. It is in.

In order to achieve the above object, an electronic device with a display unit according to the present invention is an electronic device with a display unit that includes a display unit on an upper surface of a housing of the electronic device. And a supporting means for supporting the display unit in an arbitrary inclination posture, and the holding means allows the display unit to rotate. A support leg extending from the housing to the display unit, and an elastic member that is pressed to be slidable relative to the support leg and generates a holding force of the display unit via the support leg The elastic member is elastically deformed to reduce the holding force when the display unit is rotated in the direction caused by the display unit. When the knitting is Fukudo toward the horizontal posture is intended to elastically deform so as to increase the holding force, the holding force generating unit, as the elastic member, relative and the support leg consists of a rubber material An angle keeper having a pressing surface; and a groove formed in the angle keeper and separating the angle keeper from a wall portion having the pressing surface and a remaining body portion leaving a base portion of the wall portion. Is opened in a direction opposite to the direction in which the display unit bends down (claim 1).

More preferably, the holding force generating device further includes a frame member that restrains the angle keeper except at least the wall portion (Claim 2 ).

Specifically, the support leg has a fan shape, and includes an arc surface having a constant width concentric with the rotation center of the display unit on the outer periphery, and a pair of side surfaces extending from both side edges of the arc surface, The angle keeper has a substantially U shape that surrounds the arc surface and the pair of side surfaces of the support leg from three sides, and has the pressing surface on a surface facing at least one of the arc surface and the side surfaces. It is set as the structure which has this press pad (Claim 3 ).

Here, preferably, the pressure pad having the pressing surface has a structure in which are arranged a plurality in the circumferential direction of and the angle keeper extending in the depth direction of the groove (claim 4).

  According to the present invention, in an electronic device having a display unit, the display unit can be held in an arbitrary angular position steplessly, and when the display unit is caused, the display unit can be moved with a relatively small force. When the display unit is turned down, sufficient holding power can be exhibited. For this reason, even if the display unit is enlarged, it is prevented from falling down due to its own weight, and even if an operation button or the like provided on the display unit is operated, the display unit does not fall down and can maintain a predetermined angle. There will be no trouble.

  Further, in the present invention, the angle keeper that exhibits a relatively large pressing force in one direction and a relatively small pressing force in the other direction is made of rubber that can be integrally molded, so that it is easy to manufacture. Contributes to manufacturing cost reduction. In addition, since the present invention achieves the effects such as stepless angle adjustment of the display unit and securing sufficient holding force at a predetermined angle with a small number of parts, the industrial value is great.

It is a perspective view which shows the telephone with a display unit which concerns on embodiment. It is the perspective view which looked at the display unit of FIG. 1 from the back side. It is a rear view of the display unit of FIG. It is IV arrow line view in FIG. It is a perspective view which decomposes | disassembles and shows some parts in the telephone set of FIG. It is a perspective view which expands and shows the angle keeper of FIG. It is the VII-VII sectional view taken on the line in FIG. It is the VIII-VIII sectional view taken on the line in FIG. It is a perspective view which expands and shows the inside of some circles P, while omitting some inner surfaces of the upper surface panel of a telephone. It is a schematic longitudinal cross-sectional view of the telephone set of FIG. FIG. 11 is an enlarged view of the inside of a circle Q in FIG. 10 for explaining the function of the pressure pad on the head wall side of the angle keeper when the display unit is moved in the arrow A direction. FIG. 11 is an enlarged view of the inside of a circle Q in FIG. 10 and is a diagram for explaining the function of the pressure pad on the head wall side of the angle keeper when the display unit is moved in the arrow B direction. It is a figure for demonstrating the function of the press pad by the side wall side of an angle keeper at the time of raising a display unit in the C direction corresponding to the arrow A direction of FIG. It is a figure for demonstrating the function of the press pad by the side wall side of an angle keeper at the time of depressing a display unit to the D direction corresponding to the arrow B direction of FIG.

Hereinafter, an embodiment of an electronic apparatus with a display unit according to the present invention will be described with reference to the drawings.
FIG. 1 shows a telephone 2 with a display unit according to an embodiment.

The telephone 2 includes a housing 4 as a device main body, and a handset 6 is placed on the left side of the upper surface of the phone 4 so that the handset 6 can be lifted, while a display unit 8 is disposed on the upper surface of the phone 2. Yes.
The housing 4 is formed of a plastic material, and includes a top panel 10 that forms an upper surface thereof and a bottom case 12 that forms a bottom surface portion thereof. Note that a telephone functional component (not shown) other than the handset 6 is accommodated in the housing 4.

  Here, an area on the front side of the display unit 8 is secured as a rectangular operation area 20 on the top panel 10, and dial keys 14, a station line button 16, a function button 18, and the like are arranged in the operation area 20. Yes. The left side of the operation area 20 is formed as a receiving area 21 of the handset 6 on the top panel 10, and this receiving area 21 is a pair of recesses 24, 24 that receive the receiving portion and the transmitting portion of the handset 6. In addition, a circular speaker grille 26 is provided between the recesses 24, and the speaker grille 26 includes a large number of holes distributed in a matrix. A speaker is disposed in the housing 4 below the speaker grille 26.

  The display unit 8 includes a unit main body 28 having a flat box shape, and a connecting portion 30 provided at the lower edge of the unit main body 28 as viewed in FIG. The connecting portion 30 has a cylindrical shape, and extends in the width direction of the unit body 28 along the lower edge except for both ends of the lower edge of the unit body 28. As will be described later, when the unit main body 28 is rotatably attached to the housing 4 via the connecting portion 30, the central axis of the connecting portion 30 defines the rotational central axis of the unit main body 8.

  The unit main body 28 is composed of a front case 34 and a rear case 36 which are fitted to each other. As is apparent from FIG. 1, the front case 34 is provided with a rectangular liquid crystal display 38 at the center thereof. Three operation buttons 40 are provided on each side of the display 38.

  As apparent from FIG. 2, the connecting portion 30 is provided at the lower edge of the front case 34, while a bulging portion 42 is provided at the corresponding lower edge of the rear case 36. The bulging portion 42 is adjacent to the connecting portion 30 and extends along the connecting portion 30. The bulging portion 42 has an arc-shaped back surface that protrudes toward the back side of the rear case 36, and the center of curvature of the back surface is positioned on the central axis of the connecting portion 30.

  Further, a support leg 44 extending from the bulge part 42 to the rear surface of the rear case 36 is provided at the center of the bulge part 42, and the support leg 44 projects from the rear side of the rear case 36 and the bulge part 42. Yes. The support legs 44 are substantially fan-shaped when viewed from the side of the rear case 36. Specifically, the back surface 46 of the support leg 44 is formed in an arc surface except for portions adjacent to the rear case 36 and the bulging portion 42, and has a certain width. Note that the center of curvature of the arc surface on the back surface 46 is also located on the central axis of the connecting portion 30.

  As shown in FIGS. 3 and 4, the support leg 44 is slightly tapered toward the back surface 46 and the back surface 50 of the rear case 36. That is, both side surfaces of the support leg 44 are inclined so as to be close to each other toward the back surface 46, while being inclined so as to be close to each other toward the back surface 50 of the rear case 36. That is, the support leg 44 is formed by a back surface 46 and a pair of inclined side surfaces 48, and the inclined side surface 48 extends from the side edge of the corresponding back surface 46, and reaches the back surface 50 and the bulging portion 42 of the rear case 36. Yes.

Further, as apparent from FIGS. 2 to 4, two hooking claws 52 are provided on both sides of the support leg 44 on the outer periphery of the bulging portion 42. These latching claws 52 are detachably engaged with the corresponding slots 66 of the top panel 10 and serve as stoppers for determining the maximum inclination angle of the unit main body 28.
Specifically, the maximum inclination angle of the unit body 28 is determined by the latching claw 52 coming into contact with the inner surface of the upper panel 10.

  When the inclination angle of the unit main body 28 is minimum, that is, when the unit main body 28 is in a horizontal posture, the back surface of the unit main body 28 is in contact with the top panel 10. In addition, a functional component (not shown) that allows the liquid crystal display 38 to function is accommodated in the unit main body 28. 2 and 3, reference numerals 54 and 56 denote screw holes and screws for detachably connecting the front and rear cases 34 and 36 to each other.

Next, the top panel 10 will be described in more detail with reference to FIG.
The top panel 10 is integrally provided with a pair of support portions 58 for the display unit 8, that is, the unit main body 28. These support portions 58 are respectively arranged on both sides of the upper end portion of the operation area 20 and have opposing surfaces facing each other. A rotation shaft 60 projects from the opposing surface of each support portion 58, and these rotation shafts 60 are positioned coaxially with each other. On the other hand, the connecting portion 30 of the unit main body 28 described above has bearing holes 32 at both ends thereof. Therefore, by arranging the connecting portion 30 between the pair of supporting portions 58 and inserting the rotating shaft 60 of the supporting portion 58 on the side corresponding to the bearing hole 32 of the connecting portion 30, the unit The main body 28 is rotatably supported by a pair of support portions 58 via a rotation shaft 60 (see FIG. 1).

  A semi-cylindrical recess 62 is formed in the upper part of the top panel 10. The recess 62 extends from one support portion 58 to the other support portion 58, and its axis is positioned offset to the upper edge side of the top panel 10 with respect to the axis of the rotation shaft 60. The concave portion 62 has a size capable of receiving the bulging portion 42 of the unit main body 28.

An entrance / exit 64 that extends across the recess 62 and toward the upper edge of the top panel 10 is provided at the center of the recess 62, and the entrance / exit 64 receives the support leg 44 of the unit body 28. The support leg 44 has a size that allows the support leg 44 to project and retract with movement. Further, the recess 62 is provided with two slots 66 that allow insertion of the latching claws 52 of the unit main body 28 on the left and right sides of the entrance / exit 64.
The doorway 64 has a substantially isosceles trapezoidal shape that tapers toward the upper edge of the top panel 10 so as to match the cross-sectional shape of the support leg 44.

An angle keeper 68 is fitted into the doorway 64 from the back side of the top panel 10. The angle keeper 68 is made of a rubber material, preferably silicone rubber.
The angle keeper 68 has a substantially U shape, and is fitted into the upper bottom side portion of the doorway 64. More specifically, as shown in FIG. 6, the angle keeper 68 has a pair of side walls 70 and a head wall 72 that connects the base portions of the side walls 70 to each other. The distance between the pair of side walls 70 gradually increases from the proximal end to the distal end of the side wall 70.

A plurality of pressing pads 76 are integrally formed on the inner surface of the angle keeper 68. When the supporting legs 44 are received in the doorway 64, the pressing pads 76 are formed on the supporting legs 44 described above. The outer surface of the support leg 44 is pressed while allowing the protrusion to sink. That is, the pressing pad 76 is a member that is in sliding contact with the outer surface of the support leg 44.
Specifically, each pressing pad 76 is a protrusion having an arcuate cross section extending in the thickness direction of the angle keeper 68, and is disposed at intervals in the circumferential direction of the angle keeper 68. Therefore, the inner peripheral surface of the angle keeper 68 has an uneven shape as a whole.

  The above-described pressing pad 76 determines the contact area of the angle keeper 68 with respect to the support leg 44, that is, the pressing force applied to the support leg 44 from the angle keeper 68. In the present embodiment, there are three pressing pads 76 on each side wall 70 and two on the head wall 72. In addition, the shape and the number of the pressing pads 76 can be arbitrarily changed, and thereby the pressing force applied to the support leg 44 can be adjusted.

  Further, as shown in FIGS. 7 and 8, the angle keeper 68 is provided with a concave groove 78. The concave groove 78 is formed on the upper surface 92 of the angle keeper 68 on the side where the support leg 44 protrudes from the doorway 64, extends along the inner peripheral surface of the angle keeper 68, and opens at the ends of both side walls 70. doing. Such a concave groove 78 partially separates the angle keeper 68 into a pad separation wall portion 79 having the above-described pressing pad 76 and a keeper main body other than the pad separation wall portion 79. 79 is connected to the keeper main body, that is, the side wall 70 and the head wall 72 on the corresponding side on the lower surface side of the angle keeper 68.

As described above, the angle keeper 68 described above is mounted in a portion on the upper bottom side of the doorway 64, that is, the mounting space 80 shown in FIG.
Specifically, as is apparent from the enlarged portion in FIG. 9, the mounting space 80 is secured on the inner surface side of the top panel 10, and its outer wall surrounds the upper bottom portion of the entrance / exit 64 from the outside and has a substantially U-shaped peripheral wall 82. And a pair of partition walls 88 projecting from both ends of the peripheral wall 82 toward the entrance / exit 64, and the outer shape of the mounting space 80 and the opening edge of the portion of the entrance / exit 64 corresponding to the outer shape cooperate with each other. Thus, a U-shape substantially matching the U-shape of the angle keeper 68 is provided.

  Further, the mounting space 80 is provided with a head pressing 86, and the head pressing 86 protrudes from a portion 84 of the peripheral wall 82 located on the upper bottom side of the entrance / exit 64 toward the upper bottom of the entrance / exit 64.

  Therefore, when the angle keeper 68 is mounted in the mounting space 80, the angle keeper 68 is mounted so as to surround the upper bottom side portion of the entrance / exit 64 with its upper surface 92 in contact with the inner surface of the upper panel 10. The head wall 72 is sandwiched between the top panel 10 and the head presser 86.

On the other hand, the angle keeper 68 mounted in the mounting space 80 is supported by the circuit board on the lower surface opposite to the upper panel 10. Specifically, the circuit board here is denoted by reference numeral 96 in FIG. 5, and this circuit board 96 is housed in the housing 4. A notch 98 corresponding to the entrance / exit 64 is formed on the outer edge of the circuit board 96. The notch 98 has a size that allows the support leg 44 to pass through, and the circuit board 96 supports the lower surface 94 of the angle keeper 68 in a region near the opening edge of the notch 98.
As a result, the angle keeper 68 is sandwiched between the inner surface 90 of the top panel 10 and the circuit board 96 from above and below.

Next, the raising / lowering operation of the display unit 8 (unit main body 28) will be described in more detail.
First, the angle keeper 68 is pressed against the outer surface of the support leg 44 of the display unit 8 via the pressing pad 76, and the pressing here is a predetermined pressing force accompanying the elastic deformation of the pressing pad 76, that is, The holding force is applied to the support leg 44.

  In such a state, when the user holds the display unit 8 and pulls the display unit 8 toward the front against the holding force or pushes the display unit 8 backward, the display unit 8 rotates its axis of rotation. Thus, the display unit 8 can be changed to a tilted posture or a horizontal posture with a desired tilt angle.

Here, for example, when the display unit 8 is raised in the direction of arrow A in FIG. 10, the operation of the angle keeper 68 will be described below with reference to FIG.
FIG. 11 shows a sliding contact state of the pressing pad 76 with respect to the arc-shaped back surface 46 of the support leg 44, and the pressing pad 76 here is provided on the head wall 72 of the angle keeper 68.
When the display unit 8 moves in the A direction, the back surface 46 of the support leg 44 moves in the direction of arrow a (upward as viewed in FIG. 11) in FIG. 11, and this movement also drags the pressing pad 76 in the a direction. .

  Since the angle keeper 68 is provided with the concave groove 78 on its upper surface as described above, the upward drag of the pressing pad 76 is concave as shown by the solid line state from the two-dot chain line state in FIG. The upper part of the pressing pad 76 is elastically deformed toward the groove 78 side. That is, the upper portion of the pressing pad 76 is deformed so as to escape from the support leg 44, and the pressing force of the pressing pad 76 applied to the back surface 46 of the support leg 44, that is, the holding force of the support leg 44 is reduced. As a result, when the display unit 8 is moved in the direction (A direction), the cause force required for the display unit 8 is relatively small.

On the other hand, the action of the angle keeper 68 when the display unit 8 is tilted in the direction of the arrow B in FIG. 10 becomes clear from FIG. 12 showing the same part as in FIG.
In this case, when the display unit 8 moves in the B direction, the back surface 46 of the support leg 44 moves in the direction of arrow b in FIG. 12, and the pressing pad 76 is dragged downward along with this movement. The lower portion of the head wall 72 in the angle keeper 68 does not have a concave groove that opens to the lower surface thereof, is substantially solid, and, except for the surface on the pressing pad 76 side, Since it is in a state of being restrained by the peripheral wall 82 of the mounting space 80 and the head presser 86, the downward drag of the pressing pad 76 causes the lower portion of the pressing pad 76 to swell as shown by the solid line state from the two-dot chain line state. The elastic deformation is performed so that the lower portion of the pressing pad 76 is pressed more strongly against the back surface 46 of the support leg 44.

  As a result, the holding force of the support leg 44 by the pressing pad 76 is increased, and the movement of the display unit 8 in the B direction, that is, the downward movement of the display unit 8 toward the horizontal posture is larger than the above-mentioned cause force. Pushing force is required.

  13 and 14 show a sliding contact state of the pressing pad 76 with respect to the inclined side surface 48 of the support leg 44, and the pressing pad 76 here is provided on the side wall 70 of the angle keeper 68.

  Here, as shown in FIG. 13, when moving in the direction that causes the display unit 8, the support leg 44 moves in the direction of arrow C. Along with this movement, the pressing pad 76 is dragged upward. At this time, the upper portion of the pressing pad 68 is deformed toward the concave groove 78 as in the case described above, and the holding force of the support leg 44 is reduced. As a result, the user can raise the display unit 8 with a relatively small force.

  On the other hand, as shown in FIG. 14, when the display unit 8 is tilted toward the horizontal posture, the support leg 44 moves in the arrow D direction. With this move. The pressing pad 76 is dragged downward in the same manner as described above. Also here, the side wall 70 of the angle keeper 68 is restrained by the inner surface of the top panel 10, the peripheral wall 82 of the mounting space 80, and the circuit board 96 except for the surface on the pressing pad 76 side. It is elastically deformed so as to bulge and is strongly pressed against the inclined side surface 48 of the support leg 44. As a result, the holding force of the support leg 44 is increased, and the pushing down force of the display unit 8 is required to be lowered compared to the cause force.

As described above, the display unit 8 according to the present invention can be raised with a small force, while the display unit 8 requires a large pushing force compared to the cause force. For this reason, even if the display unit 8 is increased in size and its own weight is increased, the display unit 8 can be stably held in a desired inclined posture. Further, even if the user performs a push or touch operation on the operation button 40 or the touch panel associated with the display unit 8, since the resistance against the push down of the display unit 8 is large, the display unit 8 is pushed by the push or touch operation here. The operation is not hindered without being pushed down undesirably.
Further, since the above-described operation of the display unit 8 is brought about simply by forming the concave groove 78 in the rubber angle keeper 68 having the concave groove 78, the configuration of the display unit 8 is simplified and the number of parts is also increased. Less is required, and as a result, it greatly contributes to the reduction of the manufacturing cost of the telephone.

The present invention is not limited to the above-described embodiment, and various modifications can be made.
For example, the concave groove 78 of the angle keeper 68 is not limited to the groove shape, and does not need to extend over the entire inner periphery of the angle keeper 68.
Further, the pressing pad 76 is not indispensable. Even if the pressing pad 76 is provided on the angle keeper 68, the pressing pad 76 may be provided on at least one of the side wall 72 and the head wall 70.

2 Telephone 4 Case 6 Handset 8 Display unit 10 Top panel 12 Bottom case 28 Unit body 30 Connection unit 40 Operation button 44 Support leg 46 Back surface 48 Inclined side surface 50 Rear surface 52 Latch claw 60 Rotating shaft 62 Recess 64 Entrance / exit port 66 Slot 68 Angle Keeper 70 Side Wall 72 Head Wall 76 Press Pad 78 Concave Groove 80 Mounting Space 86 Head Press 96 Circuit Board 98 Notch

Claims (4)

In an electronic device with a display unit having a display unit on the upper surface of the casing of the electronic device,
Support means for rotatably supporting the display unit with respect to the housing between a horizontal posture and a maximum inclined posture;
Holding means for holding the display unit in an arbitrary inclined posture;
The holding means is
A support leg extending from the housing to the display unit while allowing rotation of the display unit;
A holding force generator including an elastic member that is pressed to be slidable relative to the support leg and generates a holding force of the display unit via the support leg;
The elastic member is elastically deformed to reduce the holding force when the display unit is raised and rotated in the direction, whereas, when the display unit is tilted toward the horizontal posture. Is elastically deformed to increase the holding force ,
The holding force generator is
As the elastic member, an angle keeper made of a rubber material and having a pressing surface against the support leg;
A groove formed in the angle keeper and separating the angle keeper from a wall portion having the pressing surface and a remaining body portion leaving a base of the wall portion;
The electronic device with a display unit , wherein the groove is opened in a direction opposite to a direction in which the display unit slides . The electronic device with a display unit according to claim 1 , wherein the holding force generation device further includes a frame member that restrains the angle keeper except at least the wall portion. The support leg has a fan shape,
A circular arc surface having a constant width concentric with the rotation center of the display unit on the outer periphery;
A pair of side surfaces extending from both side edges of the arc surface,
The angle keeper is
The support leg has a substantially U shape surrounding the arc surface and the pair of side surfaces from three sides, and has a plurality of pressing pads having the pressing surface on a surface facing at least one of the arc surface and the side surfaces. The electronic device with a display unit according to claim 2 . The electronic device with a display unit according to claim 3 , wherein a plurality of pressing pads having the pressing surface extend in a depth direction of the groove and are arranged in a circumferential direction of the angle keeper.

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