JP4787101B2 - Display device - Google Patents

Description

  The present invention relates to a display device such as a liquid crystal display, an organic EL display, or a plasma display.

  For example, a combination meter that performs various displays in a vehicle includes an analog instrument that digitally displays information that has been displayed so far using a liquid crystal display or the like (for example, Patent Documents 1 and 2). The display contents are merely switched as appropriate, and the display is flat, so that there is a lack of clarity.

Therefore, in the past, the present applicant, from the front of the display surface so as to surround a part of the area on the display surface of the liquid crystal display by an annular member arranged to be movable along the display surface in front of the display surface of the liquid crystal display. A vehicle display device to be visually recognized was proposed (Patent Document 3).
JP-A-62-58112 Japanese Patent Laid-Open No. 11-248490 JP-A-2005-241626

  When the annular member described above is arranged in the moving direction in front of the display surface of the liquid crystal display, how the power in the rotational direction of the motor as the power source is linearly converted with a simple configuration and transmitted to the annular member. As one of the methods for realizing this, a lead screw integrated motor that moves a lead screw that is screwed into a female screw formed on a rotor in a thrust direction is used as a driving source for moving an annular member. Can be considered.

  In that case, how to suppress the rattling noise caused by the external vibration caused by the clearance secured at the screw connection part of the lead screw and rotor to prevent biting. It becomes important.

  The present invention has been made in view of the above circumstances, and an object of the present invention is to be disposed in front of a display surface of a display such as a liquid crystal display, an organic EL display, or a plasma display including the above-described vehicle display device. In adopting a configuration in which an annular member that is visually recognized so as to surround a partial region on the display surface is moved along the display surface by a lead screw integrated motor, the lead screw and the rotor due to vibration of the lead screw integrated motor It is an object of the present invention to provide a display device that can suppress the generation of noise at the screw coupling portion.

  In order to achieve the above object, the display device according to the first aspect of the present invention is arranged in such a manner that an annular member surrounding a part of display on the display surface is disposed in front of the display surface of the display and connected to the annular member. A display device configured to move the annular member along the display surface by driving a moving member with a moving drive source, wherein the moving drive source is attached to a fixed support member Lead screw integrated motor, and a coupling mechanism for connecting the leading end of the lead screw that is screw-coupled to the rotor and thrust moves in the moving direction of the annular member to the moving member by driving the rotor of the lead screw integrated motor And the connecting mechanism includes a pin provided at one of the leading end of the lead screw and the moving member, and the leading end of the lead screw. A pin support member that is provided on either one of the moving members and supports the pin so that it cannot move in the thrust moving direction of the lead screw and can move in the vertical direction; and any of the pin and the pin supporting member An urging means is provided between the heel and the moving member and urges the lead screw upward or downward in the vertical direction.

  A display device according to a second aspect of the present invention is the display device according to the first aspect of the present invention, wherein the display device is disposed so as to overlap the moving member, and the moving member is positioned at both ends of the moving range of the moving member. The guide member further includes a stopper piece that abuts against the guide member.

  Furthermore, the display device of the present invention described in claim 3 is the display device of the present invention described in claim 1 or 2, wherein the lead screw integrated motor accommodates the tip of the lead screw and the rotor. A bellows that extends between the motor main body and covers the lead screw portion on the distal end side that is drawn out from the motor main body; and the lead screw extends in a contraction direction or a contraction direction of the bellows. It was set as the structure currently urged | biased by the one of the thrust moving direction of the said lead screw with the restoring force of this bellows which acts always.

  The display device of the present invention described in claim 4 is the display device of the present invention described in claim 1, 2, or 3, wherein a buffer member is interposed between the pin and the pin support member. The configuration.

  According to the display device of the present invention described in claim 1, the lead screw whose tip is connected to the moving member that moves along the display surface of the display together with the annular member via the connecting mechanism, and the fixed support member are attached. The vertical clearance generated in the screw coupling portion with the rotor of the lead screw integrated motor that thrusts the lead screw in the moving direction of the annular member is vertically above or below the lead screw by the urging means of the coupling mechanism. By urging to the side, it is shifted to the opposite side of the urging direction.

  For this reason, it is possible to suppress the rattling noise at the screw coupling portion between the rotor and the lead screw accompanying external vibration.

  According to the display device of the present invention described in claim 2, in the display device of the present invention described in claim 1, the guide member is arranged at both end positions of the moving range of the moving member so as to overlap the moving member. Since the stopper piece comes into contact with the moving member, the moving range of the moving member can be set accurately and easily only by adjusting the relative position with respect to the guide member.

  Furthermore, according to the display device of the present invention described in claim 3, in the display device of the present invention described in claim 1 or 2, the lead screw portion on the tip side fed out from the motor body in which the rotor is accommodated is provided. By the restoring force in the extending direction or contracting direction of the covering bellows, the clearance of the lead screw in the thrust moving direction generated at the screw coupling portion of the lead screw and the rotor is shifted to the opposite side of the direction of the restoring force of the bellows, Backlash at the screw connection portion between the lead screw and the rotor is eliminated.

  For this reason, using the dust-proof bellows of the lead screw portion on the distal end side that is drawn out from the motor body, it is possible to suppress the rattling noise at the screw coupling portion between the rotor and the lead screw accompanying the rotation of the rotor.

  According to the display device of the present invention described in claim 4, in the display device of the present invention described in claim 1, 2 or 3, it is transmitted to the moving member or the annular member via the lead screw and the coupling mechanism. The vibration of the lead screw integrated motor in the protruding direction of the pin is moved between the pin provided on the moving member and the pin support member provided on the tip of the lead screw, or moved with the pin provided on the tip of the lead screw. It is cut off and absorbed by a buffer member interposed between the pin support member provided on the member.

  For this reason, it is possible to prevent the moving member or the annular member from rattling due to the vibration of the lead screw integrated motor in the projecting direction of the pin.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  1 and 2 are an exploded front perspective view and a rear exploded perspective view, respectively, showing a display device for a vehicle according to an embodiment of the display device of the present invention, and FIG. 3 is an exploded perspective view of a moving mechanism in the display device for a vehicle. FIGS. 4 and 4 are perspective views of the moving mechanism, and FIGS. 5A to 5D are a plan view, a front view, a left side view, and a right side view of the moving mechanism, respectively.

  1 and 2, a vehicle display device 1 includes a ring member (corresponding to an annular member in claims) 2, a liquid crystal display (hereinafter abbreviated as LCD; corresponding to a display in claims) 3, A moving mechanism 4 connected to the ring member 2 for moving the ring member 2 and a back case 5 are assembled and assembled.

  The ring member 2 is disposed substantially at the center of the front surface of the display surface 3 a of the LCD 3, and can be linearly moved in the horizontal direction by driving a moving mechanism 4 disposed on the back surface of the LCD 3.

  The ring member 2 is made of an opaque plastic material, and a lens 6 is fitted in a circular opening 2a formed at the center. Although the lens 6 may have any shape such as a convex shape and a concave shape, a convex lens is used here.

  Various information indicating the traveling state of the vehicle can be displayed on the display surface 3a of the LCD 3. For example, on the display surface 3a, a display design corresponding to a substantially circular dial and a pointer indicating the measured amount of the running state of the vehicle can be displayed at the center position of the display surface 3a. An example of this display design is a tachometer for indicating the engine speed, and a tachometer scale is displayed near the outer periphery thereof. In addition, a pointer for rotating the tachometer to indicate the tachometer scale corresponding to the actual measured number of engine revolutions when the engine is started is also displayed. The circular dial and the pointer display constitute an analog indicating instrument. In a region other than the center position of the display surface 3a, a meter other than the tachometer and related information are displayed.

  In synchronization with the movement of the ring member 2, the vehicular display device 1 also moves the tachometer display design from the center position of the display surface 3 a so that the tachometer display design is always surrounded by the ring member 2.

  Next, the configuration of the moving mechanism 4 that moves the ring member 2 will be described with reference to FIGS. The moving mechanism 4 is disposed behind the LCD 3, is attached to the base member 41, is movably attached to the base member 41 in the horizontal direction, extends vertically on the back side of the LCD 3, and a drive source is attached. A plate (corresponding to a support member in claims) 43 and a guide plate 44 (corresponding to a guide member in claims) for defining a moving range of the moving member 42 are provided. The upper and lower portions of the base member 41 are bent to form rail mounting portions 41a and 41a. A rail 45 is attached to the rail attachment portion 41a. The drive source mounting plate 43 and the guide plate 44 are fixed to the base member 41 with screws.

  The moving member 42 has a base portion 42 a that extends vertically on the back side of the LCD 3, and a pair of attachment pieces 42 b that are bent from both upper and lower ends of the base portion 42 a and extend in the upper and lower directions of the LCD 3. Each attachment piece 42b is attached with an attachment portion 2b provided on the upper and lower portions of the ring member 2 and a rail member 46 that is slidably fitted to the rail 45 of the base member 41.

  The guide plate 44 includes a base portion 44a fixed to the base member 41 with screws, and left and right stopper pieces 44b and 44c (corresponding to the stopper pieces in the claims) formed by bending from both left and right ends of the base portion 44a. The left and right stopper pieces 44b and 44c are formed at an interval obtained by adding the width dimension of the narrow portion 42c of the base portion 42a of the moving member 42 to the maximum allowable movement length of the moving member 42 or the ring member 2. Yes.

  After the guide plate 44 is attached and fixed to the base member 41, the rail member 46 of the attachment piece 42b of the moving member 42 is attached to the rail 45 of the base member 41, whereby the narrow portion 42c of the base portion 42a of the moving member 42 is guided. The plate 44 is disposed between the left and right stopper pieces 44b and 44c.

  Stopper pieces 42d and 42e that can be brought into contact with the left and right stopper pieces 44b and 44c of the guide plate 44 are formed on the left and right edges of the narrow width portion 42c of the base 42a of the moving member 42, respectively. When the stopper pieces 42d and 42e are in contact with the corresponding left and right stopper pieces 44b and 44c of the guide plate 44, the moving range of the moving member 42 to the ring member 2 is defined.

  A lead screw integrated motor 47 (hereinafter abbreviated as “motor”) is mounted on the drive source mounting plate 43. As the motor 47, a PM stepping motor having a lead screw 47a as an output shaft is used. As shown in FIG. 6, this PM type stepping motor has a structure of a two-stage stator having a first stator A and a second stator B with respect to a rotor 47c using a permanent magnet housed in a motor body 47b. It is what has. As shown in FIG. 7, the first stator A has stators A-1 to A-4, and the second stator B has the same number of stators B-1 to B-4 as the first stator. Have

  Incidentally, the number of divisions of the first and second stators A and B is actually larger than the number of divisions (four divisions) shown in FIG. 7, and is generally divided into 24 to 48 divisions.

  FIG. 8 shows the excitation waveform to each stator when the number of divisions schematically shown in FIG. 7 is used. In each stator, the upper and lower stators are alternately excited in the order of stator A-1, stator B-1, stator A-2, stator B-2, stator A-1, stator B-1, and so on. 6, the rotor 47c shown in FIG. 6 has a prescribed number of steps equal to the total number of divisions of the first and second stators A and B (as schematically shown in FIG. 7, the first and second stators A and B have When the number of divisions is 4, it is rotated once in 8 steps).

  When the rotor 47c rotates, the lead screw 47a moves in the thrust direction by ball screw coupling between the female screw 47d formed therein and the male screw 47e of the lead screw 47a penetrating the rotor 47c.

  As shown in FIG. 3, the motor 47 has a thrust direction of the lead screw 47a that matches the moving direction of the moving member 42 (and hence the moving direction of the ring member 2) by screwing the drive source mounting plate 43 on which the motor 47 is mounted. Thus, it is fixedly attached to the base member 41.

  The leading end 47 f of the lead screw 47 a is connected to the base portion 42 a of the moving member 42 via the connecting mechanism 48. The coupling mechanism 48 is attached by screws to a pin 48a protruding from the narrow portion 42c of the base 42a of the moving member 42 and a tip 47f of a lead screw 47a processed with a D-cut (or I-cut) for rotation prevention. And a pin support member 48b.

  The pin support member 48b has a pin receiving hole 48c into which the pin 48a is inserted. The pin receiving hole 48c moves the pin 48a in the thrust moving direction of the lead screw 47a to which the pin support member 48b is attached. It is made of a long hole whose longitudinal direction is the vertical direction, which is impossible and allows the pin 48a to move in the vertical direction perpendicular thereto.

  The pin support member 48b is fitted to the pin 48a with rubber bushes 48d and 48d (corresponding to the buffer member in the claims) disposed on the front and rear sides thereof. The pin 48a is further fitted with a washer 48e from above, and finally the E ring 48f is fitted into the ring groove 48g at the tip of the pin 48a so that the pin 48a is supported by the E ring 48g. The member 48b is connected to the pin 48a.

  The coupling mechanism 48 further includes a coil spring 48h (corresponding to the urging means in the claims) provided between the pin support member 48b and the base portion 42a of the moving member 42. By this coil spring 48h, The lead screw 47a is urged downward in the vertical direction via the pin support member 48b.

  In the present embodiment, the motor 47 and the coupling mechanism 48 constitute a moving drive source in the claims.

  In the above-described configuration, when the motor 47 starts to rotate in response to an instruction from the drive command signal, the thrust direction movement of the lead screw 47a is transmitted to the moving member 42 via the connecting mechanism 48, and the moving member 42 is connected to the upper and lower rails 45. The rail member 46 is guided to move in a straight line in the horizontal direction.

  In the vehicle display device 1 of the present embodiment configured as described above, the coil spring 48h of the coupling mechanism 48 urges the lead screw 47a downward in the vertical direction via the pin support member 48b. The vertical clearance generated between the female screw 47d of 47c and the male screw 47e of the lead screw 47a is shifted to the upper side of the lead screw 47a, and the female screw 47d and the male screw 47e are in close contact with each other without clearance.

  For this reason, it is possible to suppress or prevent rattling noise from being generated at the ball screw coupling portion between the lead screw 47a and the rotor 47c due to vibration applied to the motor main body 47b from the outside.

  In the connection of the pin 48a and the pin support member 48b in the connection mechanism 48, it is not always necessary to arrange the rubber bushes 48d and 48d before and after the pin support member 48b, but the pin support member 48b of the pin support member 48b as in the present embodiment. If the rubber bushes 48d and 48d are arranged at the front and rear, the vibration of the lead screw 47a in the projecting direction of the pin 48a, which is transmitted to the base 42a of the moving member 42 and the ring member 2 via the pin 48a, is absorbed by the rubber bushes 48d and 48d. This is advantageous because it can be cut off and absorbed by 48d.

  Further, the movement range of the moving member 42 may be performed by a stopper member that is individually attached and fixed to the base member 41. However, as in the present embodiment, the stopper that can come into contact with the stopper pieces 42d and 42e of the moving member 42 is provided. Use of the guide plate 44 having the pieces 44b and 44c on the left and right is advantageous because the moving range of the moving member 42 can be accurately and easily set only by adjusting the relative position with respect to the guide plate 44.

  Incidentally, the motor 47 used in the vehicle display device 1 of the present embodiment has a rotor in which dust adheres to the surface of the lead screw 47a because the lead screw 47a moves in the thrust direction and moves in and out of the motor main body 47b. It is important to avoid the occurrence of abnormal operation of the motor 47 so that it does not get caught between the motor 47c and the motor 47.

  Therefore, as shown in a perspective view in FIG. 9, a bellows 47g that can be expanded and contracted is provided between the tip 47f (not shown in FIG. 9) of the lead screw 47a of the motor 47 and the motor main body 47b. The tip 47f side portion of the lead screw 47a that is fed out may be covered with the bellows 47g, and the portion on the opposite side of the lead screw 47a that protrudes from the opposite side of the motor body 47b may be covered with the cover member 47h.

  In such a configuration, the bellows 47g, as shown in a cross-sectional view in FIG. 10, makes either the contracted state (A) or the extended state (B) a natural state, and the rest accumulates restoring force. Assuming that this is the case, the restoring force of the bellows 47g causes the lead screw 47a to constantly move in either the direction in which the tip 47f in the thrust movement direction advances from the motor body 47b or the direction in which the motor body 47b approaches. Will be energized.

  Due to the restoring force of the bellows 47g, the lead screw 47a is always urged in one of the thrust movement directions, so that the vertical direction generated between the female screw 47d of the rotor 47c of the motor 47 and the male screw 47e of the lead screw 47a. The clearance is shifted to the side opposite to the direction of the urging force due to the restoring force of the bellows 47g, and the female screw 47d and the male screw 47e come into close contact with each other without any clearance on the direction of the urging force due to the restoring force of the bellows 47g.

  For this reason, if this configuration is adopted, in addition to the above-described effect, the bellows 47g for dust removal is used to suppress the rattling noise at the ball screw coupling portion between the rotor 47c and the lead screw 47a accompanying the rotation of the rotor 47c. Or can be prevented.

  In addition, when the lead screw 47a is urged in the thrust moving direction by using the restoring force of the bellows 47g, the cover member 47h may not be used in combination as long as there is no problem in preventing dust.

  In the above-described embodiment, the coupling mechanism 48 includes the pin 48a provided on the moving member 42 side and the pin support member 48b attached to the tip 47f of the lead screw 47a and fitted on the pin 48a. However, for example, a pin formed by bending the tip 47f of the lead screw 47a at a right angle, and this pin make the movement of the lead screw 47a in the thrust moving direction impossible, and the vertical movement perpendicular thereto is made impossible. It is good also as a structure which has the long hole provided in the movement member 42 side so that it may be possible.

  When the coupling mechanism having such a configuration is used, it is necessary to block and absorb the vibration of the lead screw 47a in the projecting direction of the pin 48a, which is transmitted to the base 42a of the moving member 42 and the ring member 2, by the buffer member. The pin may be interposed between the pin provided at the tip 47f of the lead screw 47a and the pin support member provided on the moving member 42 side.

  The coil spring 48h that urges the lead screw 47a downward in the vertical direction may be installed between the pin provided at the tip 47f of the lead screw 47a and the moving member 42.

  Furthermore, the urging direction of the lead screw 47a by the coil spring 48h may not be vertically downward as in the present embodiment, but may be vertically upward.

  In the above-described embodiment, an LCD is used as a display. However, the present invention is not limited to this, as long as the display content can be changed in an electric program, such as an organic EL or a plasma display. Other display elements can be used.

  Furthermore, the ring member 2 is not limited to a circular shape, and may be any annular shape that partitions the display, such as a polygonal shape such as a quadrangle or a shape in which a part of the circle is a straight line.

  In the embodiment described above, the present invention has been described by taking the vehicular display device 1 as an example. However, the present invention is not limited to the vehicular display device, and moves along the display surface in front of the display surface of the display. If the display device is configured to be viewed from the front of the display surface so as to surround a partial area on the display surface of the display by the annular member that can be arranged, the display device can be applied to applications other than those for vehicles. is there.

It is a front exploded perspective view showing a display for vehicles concerning one embodiment of a display of the present invention. It is a back surface disassembled perspective view which shows the display apparatus for vehicles of FIG. It is a disassembled perspective view of the moving mechanism in the display apparatus for vehicles of FIG. It is a perspective view of the moving mechanism in the display apparatus for vehicles of FIG. (A) thru | or (D) are the top view of a moving mechanism in the display apparatus for vehicles of FIG. 1, a front view, a left view, and a right view. It is sectional drawing which shows the structure of the lead screw integrated motor of FIG. It is a fragmentary perspective view of the lead screw integrated motor of FIG. It is a figure which shows the excitation waveform to the stator of the lead screw integrated motor of FIG. It is a perspective view of the other lead screw integrated motor which can be used instead of the lead screw integrated motor of FIG. (A) And (B) is sectional drawing which shows the contraction state and expansion | extension state of the lead screw integrated motor of FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Display apparatus for vehicles 2 Ring member (annular member)
3 Liquid crystal display (display)
3a Display surface 4 Movement mechanism 41 Base member (support member)
42 Moving member 44 Guide plate (guide member)
44b, 44c Stopper piece 47 Lead screw integrated motor (moving drive source)
47a Lead screw 47b Motor body 47c Rotor 47f Lead screw tip 47g Bellows 48 Connection mechanism (drive source for movement)
48a pin 48b pin support member 48d rubber bush (buffer member)
48h Coil spring (biasing means)

Claims (4)

An annular member surrounding a part of display on the display surface is disposed in front of the display surface of the display, and the moving member connected to the annular member is driven by a moving drive source, whereby the annular member is displayed on the display surface. A display device configured to move along a surface,
The drive source for movement includes a lead screw integrated motor attached to a fixed support member, and is screw-coupled to the rotor by driving the rotor of the lead screw integrated motor to thrust in the moving direction of the annular member. A connecting mechanism that connects the tip of the moving lead screw to the moving member;
The coupling mechanism is provided on any one of the tip of the lead screw and the moving member, and on the other of the tip of the lead screw and the moving member. A pin support member that is immovable in the thrust movement direction of the screw and is supported so as to be movable in the vertical direction, and is installed between the pin and any one of the pin support member and the movement member, and the lead screw is moved upward in the vertical direction. Or a biasing means for biasing downward,
A display device characterized by that.   The display device according to claim 1, further comprising a guide member that is disposed so as to overlap the moving member, and further includes a stopper piece that contacts the moving member at both end positions of the moving range of the moving member.   The lead screw-integrated motor includes an extendable bellows that extends between the tip of the lead screw and a motor main body in which the rotor is accommodated and covers the lead screw portion on the tip side that is drawn out from the motor main body. The lead screw is further urged in one of the thrust moving directions of the lead screw by a restoring force of the bellows that always acts in the extending direction or contracting direction of the bellows. Display device.   The display device according to claim 1, wherein a buffer member is interposed between the moving member and the pin or the pin support member.

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