JP2013037266A - Display holding mechanism and opening/closing type display device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a display holding mechanism capable of surely holding a display of a use state while keeping quality during rotation by a simple configuration.SOLUTION: The display holding mechanism includes: a brake shoe 52 for imparting braking torque to a rotation axis 54 of the display 18; and a brake lever section. The brake lever section comprises: pressing sections 60a and 62a for pressing the brake shoe 52 and first and second levers 60 and 62 including leaf spring sections 60b and 62b energized by a cam member 56. During rotation of the display 18, only the leaf spring section 60b of the first lever 60 is energized and small torque is imparted to the rotation axis 54. When the display 18 is stopped at a use position, the cam member 56 is rotated to energize the leaf spring section 62b of the second lever 60 and large torque is imparted to the rotation axis 54. Accordingly, the display 18 is surely held at a stop position.

Description

  The present invention relates to a display holding mechanism for holding a rotatable display, and an open / close display device provided with the display holding mechanism.

  In recent years, many one-box vehicles and large vehicles are equipped with a display device for a rear seat. The rear seat display device is fixed to, for example, the inside of the ceiling of a vehicle, and the display is supported so as to be rotatable from a storage position in the housing to a use range through a pass range. When the device is not used, the display is stored in the storage position so that the display does not block the front view. Further, when the apparatus is used, the display is rotated to the use range through the passage range, and is held at an appropriate position (use position) within the use range by the user.

  In such a display device, when the display is rotated more than 90 degrees with reference to the storage position, the direction of the load received by the display driving gear is changed by the weight of the display. Since the backlash is reversed and the display is shaken, the quality at the time of rotation is lost. Furthermore, it is necessary to hold the display in the use position in order to prevent the display in use from rattling due to the vibration of the vehicle.

  Therefore, in Patent Document 1, the first and second torque generators that generate torque in the hinge part by providing an inclined part in the bracket attached to the hinge part of the display and displacing the spring plate that contacts the bracket. A display device is disclosed in which mechanisms are arranged on both sides of a display rotation shaft, and torque characteristics that change according to the display rotation angle are made different between the first and second torque generation mechanisms.

  Patent Document 2 discloses a display lock mechanism that holds a display in a use position by frictional force with the rotation shaft by tightening the rotation shaft of the display from the outside when the display stops at the use position. .

JP 2006-119165 A JP 2007-171922 A

  In the display device described in Patent Document 1, torque is generated by contact between an inclined portion provided on each bracket attached to a hinge portion of the display and a spring plate connected to the bracket. The amount of torque to be applied was small, and it was difficult to securely hold the display. In particular, when the display is relatively large and heavy, the tendency is remarkable.

  Therefore, by combining the torque generation mechanism described in Patent Document 1 with the display lock mechanism described in Patent Document 2, the display can be used at the use position while preventing rattling at the boundary between the passage range and the use range. Since it can hold | maintain reliably, it is preferable. However, the combination of a plurality of mechanisms increases the number of parts, which causes a problem from the viewpoint of cost and downsizing of the apparatus.

  The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a display holding mechanism that can reliably hold a display in use while maintaining the quality during rotation with a simple configuration. And

  The display holding mechanism of the present invention holds the display at a use position within the use range, and a first torque generating unit that generates a first torque that resists rotation of the display in the passing range and the use range. A second torque generating unit that generates the second torque and a brake that operates the first torque generating unit and operates the second torque generating unit when the display stops at the use position. Part.

  With this configuration, a plurality of torque generators that generate torque when the display is rotated and when the display is stopped are operated by a single braking unit. It is possible to reduce the size and cost of the apparatus without impairing the function of reliably holding the display in use while maintaining the above.

  In the display holding mechanism of the present invention, the torque generated by the second torque generator is set to be larger than the torque generated by the first torque generator. With this configuration, since a large torque can be applied only when the display is at the stop position, the display can be reliably held at the stop position while suppressing the braking torque when the display is rotated. Therefore, it is possible to reduce power consumption necessary for display rotation control.

  The display holding mechanism of the present invention includes a brake unit that brakes the display by sandwiching a rotation shaft of the display, and each of the first and second torque generating units is a plate connected to the braking unit. The lever member includes a spring portion and a pressing portion for pressing one end of the brake portion to brake the display when the leaf spring portion is urged by the braking portion. Thereby, a display holding mechanism can be comprised compactly.

  In the display holding mechanism of the present invention, the braking unit includes a cam member that contacts the leaf spring portion of the first torque generation unit, and a drive mechanism that drives the cam member, and the first torque generation The leaf spring portion of the second portion is always biased by the cam member, and the leaf spring portion of the second torque generating portion is biased only when the cam member rotates to a predetermined position. Have. With this configuration, the operations of the two torque generating units can be controlled with a simple configuration, and the apparatus can be reduced in size and cost.

  The display device of the present invention includes the above-described display holding mechanism, a display that displays an image, and a display opening / closing mechanism that rotates the display between the use position and the storage position. Even with such a configuration, similarly to the above, the device can be reduced in size and cost without impairing the function of securely holding the display in use while maintaining the quality during rotation. be able to.

  According to the present invention, there is an effect that a display in use can be reliably held while maintaining the quality at the time of rotation with a simple configuration.

The side view which shows the structure of the vehicle provided with the opening-and-closing display apparatus which concerns on one Embodiment of this invention. FIG. 1 is an external perspective view of the opening / closing display device of FIG. FIG. 1 is an external perspective view of the retractable display device in FIG. Explanatory drawing showing the rotation range of the display A plan view showing the internal configuration of the openable display device Side view showing configuration of display braking unit External perspective view showing the positional relationship between two types of leaf springs Plan view showing configurations of brake lever and brake shoe It is a top view which shows the structure of a display braking part, (A) is the state in which a display is in a rotation range, (B) The state which the display stopped in the use position A graph showing the relationship between the rotation angle of the display and the spring load applied to the rotation axis Block diagram showing the electrical configuration of the openable display device The flowchart which shows the process of rotation operation | movement of a display apparatus

  Hereinafter, a display device for a rear seat provided with a display holding mechanism according to a preferred embodiment of the present invention will be described with reference to the drawings.

  FIG. 1 is a side view of a vehicle provided with a display device. The display device 10 is fixed to the inner surface of the top plate of the vehicle 12 between the front seat 14 and the rear seat 16 of the vehicle 12. The display device 10 includes a display 18 that outputs and displays video, and the display 18 is configured to protrude downward from the device main body. As a result, the passenger in the rear seat can appreciate the video displayed on the display 18.

  The appearance of the display device 10 is shown in FIGS. The display device 10 includes a housing 20, a playback device 22, and a display 18. The display 18 has a use position (see FIG. 2) that protrudes downward from the storage portion 24 formed in the housing 20 and a storage position in which the display 18 is stored in the storage portion 24 formed in the housing 20 (see FIG. 3). It is comprised so that rotation is possible. Here, as the playback device 22, for example, a DVD drive or a BD drive can be used.

  Further, as shown in FIG. 4, the display 18 passes through the passage range from the storage position (corresponding to FIG. 3) and is rotated to the use position (corresponding to FIG. 2) within the use range. When the angle of the display 18 at the storage position is set as a reference (0 degree), the use range is set so that the user can easily see the screen in consideration of variations in the body shape and posture of the user. Is set to degrees. The display device of this embodiment is a so-called free stop type, and the display 18 is rotated to the use range and held at an appropriate position (use position) within the use range.

  FIG. 5 is a plan view showing the configuration of the drive mechanism of the display device 10. The drive mechanism of the display device 10 includes a display opening / closing unit 26 and a display braking unit 28. The display opening / closing unit 26 includes an opening / closing motor 30, a transmission gear train 32, a terminal gear 34, and a rotating shaft 36 that is coaxially attached to the terminal gear 34. The driving force from the opening / closing motor 30 is transmitted to the rotary shaft 36 via the transmission gear train 34 and the terminal gear 34, and the rotary shaft 36 rotates, whereby the display 18 rotates between the storage position and the use position. Move.

  Further, a display position sensor 38 (see FIG. 11) is provided in the vicinity of the end gear 34 to detect the presence / absence and rotation position of the end gear 34. For example, a rotary sensor is used as the display position sensor 38, and by detecting a signal from the display position sensor 38, it is possible to detect whether the display 18 is rotating and the amount of rotation.

  As shown in FIG. 6, the display braking unit 28 includes a holding motor 40, a worm gear 42, transmission gears 44 and 46, a sector gear 48, a brake lever unit 50, a brake shoe 52, and a rotating shaft 54, and is substantially annular. The rotating shaft 54 of the display 18 is attached to the inside of the brake shoe 52. When the holding motor 40 is driven, the driving force of the holding motor 40 is transmitted to the sector gear 48 via the worm gear 42 and the transmission gears 44 and 46, and the sector gear 48 rotates.

  A cam member 56 for urging the brake lever portion 50 is coaxially attached to the sector gear 48, and the cam member 56 rotates with the rotation of the sector gear 48, and a first lever 60 and a second lever, which will be described later. 62 is pressed. A rotation angle sensor 72 (see FIG. 11) for detecting the rotation angle of the cam member 56 is provided in the vicinity of the cam member 56. The sector gear 48 and the cam member 56 may be integrally formed.

  The brake lever portion 50 applies torque to the rotating shaft 54 by tightening the brake shoe 52. In the present embodiment, a pair of brake lever portions 50 are provided so that a load can be applied to the brake shoe 52 almost evenly. Is provided. As shown in FIG. 7, the brake lever portion 50 includes an outer first lever 60, an inner second lever 62, and a pin 64 that rotatably holds the first lever 60 and the second lever 62.

  The first lever 60 includes a pressing portion 60a rotatably supported by a pin 64, and a flat plate spring portion 60b extending from the pressing portion 60a. The second lever 62 is disposed inside the first lever 60, and is provided with a pressing portion 62a rotatably supported by a pin 64, and a flat plate spring portion 62b extending from the pressing portion 62a. It has.

  FIG. 8 shows the configuration of the brake lever portion 50 and the brake shoe 52 with the cam member 56 removed. The leaf spring portions 60b of the first lever 60 provided on the outer side are bent so as to face each other (to warp in FIG. 7). In addition, one end of the pressing portion 60a of the first lever 60 is in contact with a protrusion 52a formed on one end of the brake shoe 52, so that the pair of leaf spring portions 60b are urged in a direction in which the pair of leaf spring portions 60b spread. Sometimes, the pressing portion 60 a presses the protrusion 52 a of the brake shoe 52, and a torque for tightening the rotating shaft 54 by the brake shoe 52 is applied.

  The leaf spring portion 62b of the second lever 62 is maintained at a substantially horizontal position with respect to the pressing portion 60a. When the cam member 56 is not provided, the leaf spring portions 60b and 62b are separated from each other. Retained. Further, the pressing portion 60a of the second lever 62 is in contact with the pressing portion 60a of the first lever 60, and when the pair of leaf spring portions 62b are urged in the direction in which the pair of leaf spring portions 62b spread, The pressing portion 62 a presses the protrusion 52 a of the brake shoe 52 via the pressing portion 60 a of the first lever 60, and torque for tightening the rotating shaft 54 is applied by the brake shoe 52.

  Further, the leaf spring portion 60 b of the first lever 60 is formed to be thinner than the leaf spring portion 62 b of the second lever 62, and the spring constant of the leaf spring portion 60 b of the first lever 60 is the spring of the second lever 62. It is set smaller than the constant. Thereby, the pressing force (torque to the rotating shaft 54) to the brake shoe 52 by the first lever 60 can be made smaller than the pressing force (torque to the rotating shaft 54) by the second lever 62.

  FIG. 9 is an explanatory view showing the operation of the display braking unit 28, FIG. 9A shows the case where the display 18 is rotating, and FIG. 9B shows the display 18 stopped at the use position. Shows the case. The distal end of the leaf spring portion 60 b of the first lever 60 is in contact with the outer periphery of the cam member 56, and the distal end of the pressing portion 60 a of the first lever 60 is in contact with a protrusion 52 a formed on the brake shoe 52. A part of the substantially annular brake shoe 52 is in contact with the rotation shaft 54 of the display 18.

  As shown in FIG. 9A, when the display 18 is rotating in the passage range and the use range, the cam member 56 contacts the leaf spring portion 60b of the first lever 60, and a pair of leaf spring portions 60b. Is energized in the direction of leaving. For this reason, the pressing portion 60a of the first lever 60 presses the protrusion 52a of the brake shoe 52, and the brake shoe 52 tightens the rotating shaft 54 of the display 18 with a constant torque. As a result, a constant amount of torque is always applied to the rotating display 18. Therefore, when the display 18 passes the boundary between the passing range and the use range, it is caused by reversal of the backlash of the drive gear. The occurrence of sticking can be prevented.

  In the state shown in FIG. 9A, the leaf spring portion 62b of the second lever 62 is not biased by the cam member 56, and therefore the brake shoe 52 is pressed by the pressing portion 62a of the second lever 62. There is no. As a result, only a small torque by the first lever 60 can be applied to the rotating display 18, and the power consumption during the rotation of the display can be kept low.

  As shown in FIG. 9B, when the display 18 stops at the use position, the holding motor 40 is driven, and the sector gear 48 and the cam member 56 rotate in the clockwise direction in the drawing. Then, both the leaf spring portions 60b and 62b of the first lever 60 and the second lever 62 are urged by the protrusions of the cam member 56, and both of the pair of leaf spring portions 60b and 62b bend in a direction in which they expand. It is done. Both the pressing portions 60a and 62a of the first lever 60 and the second lever 62 press the protrusion 52a of the brake shoe 52, and the brake shoe 52 tightens the rotating shaft 54 of the display 18 with a constant torque. The leaf spring 62b of the second lever 62 is formed thick and the brake shoe 52 is tightened with a strong torque by the second lever 62, so that the display 18 in the stop position is securely held.

  FIG. 10 is a graph showing an example of a change in load (spring load) by the first lever 60 and the second lever 62. In FIG. 10, the horizontal axis indicates the amount of deflection of the leaf spring portion 60 b with respect to the first lever 60, and the vertical axis indicates the spring load by the first lever 60 and the second lever 62. Here, since the leaf spring portion 62b of the second lever is formed thicker than the leaf spring portion 60b of the first lever 60, the spring of the second lever 62 is compared with the inclination of the spring load of the first lever 60. The load gradient is large.

  Here, the horizontal axis of FIG. 10 is based on the amount of deflection of the leaf spring portion 60b of the first lever 60, and only the first lever 60 is biased by the cam member 56 (in FIG. 9A). In this state, the deflection amount is L1, and at this time, the second lever 62 is not biased by the cam member 56, so the spring load by the second lever 62 becomes 0, and the total load (the protrusion of the brake shoe 52) The spring load received by 52a is W1.

  When the deflection amount of the first lever exceeds L1, both the leaf spring portions 60b and 62b of the first lever and the second lever are urged by the protrusions of the cam member 56, so that the deflection amount increases. The spring load of the first lever 60 and the second lever 62 increases, and the total load shown in FIG. 10 also increases. Then, the rotation angle (set angle) of the cam member 56 is adjusted so that the amount of deflection when the total load W2 necessary to hold the display 18 at the stop position is L2.

  Here, it is sufficient that the braking torque (corresponding to the spring load W1) to be applied to the rotating display 18 is enough to suppress the reverse of the backlash of the gear that rotates the display, and the braking torque is excessively increased. If this is the case, it is not preferable because much electric power is required to rotate the display. Therefore, it is necessary to suppress the error of the braking torque applied to the rotating display 18 within a certain range. In this regard, in the conventional braking mechanism, the yield could not be improved due to variations in component accuracy. According to the display holding mechanism according to the present invention, the deflection amount of the leaf spring portion 60b of the first lever 60 Since it is possible to easily realize an appropriate spring load W1 simply by adjusting the above, it is possible to improve the yield of the apparatus. Further, even if the deflection amount of the leaf spring portion 60b of the first lever 60 is deviated, the fluctuation amount of the leaf spring portion 60b spring load of the first lever 60 (the amount of change in torque applied to the rotating display). ) Is small, it is possible to suppress fluctuations in power consumption.

  In addition, according to the display holding mechanism according to the present invention, a display holding mechanism similar to the conventional one can be realized only by providing another lever outside the second lever 62 for holding the display at the stop position. Thus, the number of parts can be reduced and the apparatus can be downsized.

  Note that the thicknesses and deflection amounts of the leaf spring portions 60b and 62b of the first and second levers 60 and 62 depend on the torque to be applied to the rotating display and the torque to be applied to the display at the stop position. Can be determined as appropriate.

  An example of the electrical configuration of the display device 10 is shown in FIG. The control unit 70 receives information from the display position sensor 38 and the rotation angle sensor 72 and controls output to the opening / closing motor 30 and the holding motor 40. Further, the operation unit 74 is operated by the user in order to rotate the display 18 between the use position and the storage position.

  The flowchart of FIG. 12 shows the procedure of the process of rotating the display 18 from the storage position to the use position. When the display 18 is in the storage position, the cam member 56 is in the position shown in FIG. 9A, and the brake shoe 52 is only pressed by the first lever 60.

  In this state, when it is detected that the user has operated the operation unit 74 (S11), the control unit 70 drives the opening / closing motor 30 to rotate the display 18 from the storage position toward the use position. (S12). Then, the rotation operation by the user is finished, and it is detected from the signal from the display rotation sensor whether the display 18 is stopped at the use position (S13). When it is detected that the display 18 is stopped at the use position, the control unit 70 stops the opening / closing motor 38 (S14) and drives the holding motor 42 to rotate the cam member 56 (S15).

  Then, the control unit 70 detects whether or not the cam member 56 is rotated by the set angle (S16), and when the cam member 56 is rotated by the set angle, the control unit 70 stops the holding motor 42. (S17). The brake shoe 52 is pressed by the first lever 60 and the second lever 62, and the rotation shaft 54 of the display 18 is tightened with a strong torque by the brake shoe 52. As a result, the display 18 at the stop position is securely held, and the possibility of shaking the display 18 due to the vibration of the running vehicle can be eliminated.

  The embodiment of the present invention has been described above by way of example, but the scope of the present invention is not limited to this, and can be changed or modified according to the purpose within the scope described in the claims. is there. For example, the first lever and the second lever are not limited to the illustrated shapes, and can take various forms as long as the same effects as the present invention are exhibited.

  Moreover, in the said embodiment, although demonstrated taking the example of the opening-and-closing display apparatus for vehicles, this invention is not limited to this, For example, the opening-and-closing display apparatus provided in the cabin area of an aircraft It can be similarly applied to.

  The openable display device of the present invention can contribute to downsizing and cost reduction of the drive mechanism without impairing the function of reliably holding the display in use while maintaining the quality at the time of rotation, It is useful as a display device for vehicles.

DESCRIPTION OF SYMBOLS 10 Opening-and-closing display apparatus 18 Display 26 Display opening / closing part 28 Display braking part 30 Opening / closing motor 36,54 Rotating shaft 38 Display position sensor 40 Holding motor 50 Brake lever part 52 Brake shoe 56 Cam member 60 1st lever 62 2nd lever 60a, 62a pressing part 60b, 62b leaf spring part 70 control part 72 rotation angle sensor

Claims (5)

A display holding mechanism for holding a display that can be rotated from the storage position to the use range beyond the passing range,
A first torque generator for generating a first torque that resists rotation of the display in the passage range and the use range;
A second torque generator for generating a second torque for holding the display at a use position within the use range;
A display holding mechanism, comprising: a brake unit that operates the first torque generating unit and operates the second torque generating unit when the display stops at the use position.   The display holding mechanism according to claim 1, wherein the torque generated by the second torque generator is set to be larger than the torque generated by the first torque generator. A brake unit that brakes the display by sandwiching the rotation axis of the display;
Each of the first and second torque generating portions presses one end of the brake portion when the leaf spring portion connected to the braking portion and the leaf spring portion are urged by the braking portion. The display holding mechanism according to claim 1, wherein the display holding mechanism is a lever member having a pressing portion for braking the display. The braking portion includes a cam member that contacts the leaf spring portion of the first torque generating portion, and a drive mechanism that drives the cam member.
The leaf spring portion of the first torque generating portion is always urged by the cam member,
4. The display holding mechanism according to claim 3, wherein the leaf spring portion of the second torque generating portion is biased only when the cam member is rotated to a predetermined position. A display holding mechanism according to any one of claims 1 to 4,
A display for displaying images,
An openable / closable display device comprising a display opening / closing mechanism for rotating the display between the use position and the storage position.

Images