JP4363399B2 - Vehicle display device - Google Patents

Description

  The present invention relates to a vehicle display device, and more particularly to a vehicle display device having a moving mechanism for moving a display unit in a predetermined direction.

  As a vehicle display device, for example, a device provided in a navigation device, a device used as an in-vehicle television, and the like are known. Some of these vehicle display devices have a display unit that can be moved by a moving mechanism.

  For example, this is the device described in Patent Document 1. The device described in Patent Document 1 can adjust the angle of the display unit around a rotation axis parallel to the vehicle width direction by an open / close mechanism capable of electrical control, and can be electrically controlled. The traveling mechanism can also cause the display unit to be self-propelled in the vehicle front-rear direction.

The opening / closing mechanism has a configuration in which a worm is provided on a rotating shaft of a motor and a wheel meshing with the worm is connected to a display unit via a connecting rod or the like. In this configuration, the attitude of the display unit is maintained by the gear ratio of the worm gear composed of the worm and the wheel, but if the user applies a certain amount of force to the display unit, the angle of the display unit can be directly adjusted. .
JP-A-6-48254

  When the display unit can be moved by a moving mechanism such as an opening / closing mechanism, the display unit can be operated by a force from the user in order to enable a user's direct operation as in the device described in Patent Document 1. The part can be moved in both directions of the moving direction by the moving mechanism in many cases.

  By the way, a vibration generated as the vehicle travels may be transmitted to the display device mounted on the vehicle. Since this vibration is an external force applied to the display unit in the same manner as a force from the user, it is also conceivable that the position of the display unit is shifted from a predetermined position by the vibration. In particular, if the display becomes larger and its weight increases in the future, there is a greater risk that the position of the display unit will shift due to vibration.

  The present invention has been made based on this situation, and an object of the present invention is to provide a vehicle display device that can hold a display unit in a predetermined position even when vibration occurs. .

  In order to achieve the object, the invention described in claim 1 is a vehicle display device including a display unit and a moving mechanism for moving the display unit in a predetermined direction, and sequentially detects vibrations of the vehicle. The vibration detecting device, the stopper portion that prevents the display portion from moving to one side by colliding with the display portion, and the vibration detecting device that is detected in a state where the display portion abuts the stopper portion. And moving mechanism control means for actuating the moving mechanism in a direction in which the display unit moves toward the stopper unit based on the fact that the vibration is greater than or equal to a predetermined value.

  In this way, if the vibration detection device sequentially detects the vibration of the vehicle and based on the detected vibration being a predetermined value or more, if the moving mechanism is operated in the direction in which the display unit moves to the stopper unit side, It is suppressed that a display part moves to the opposite side to a stopper part by vibration.

  According to a second aspect of the present invention, in the vehicle display according to the first aspect of the present invention, the display unit includes a swing shaft that is a swing center of the display unit, and the display unit abuts on the stopper unit. In this state, it is characterized in that it is parallel to the vertical plane including the axis of the swing shaft, or the upper part of the vertical plane protrudes on the opposite side to the stopper part with respect to the lower part.

  When the display unit can swing around a predetermined swing axis, unlike the second aspect, the lower part of the display unit is opposite to the stopper unit with respect to the upper part in a state of being in contact with the stopper unit. In the case of projecting to the side, a force in the direction of the stopper portion is applied to the display portion by its own weight. Therefore, the display part is less likely to swing in the direction away from the stopper part due to vibration, but in the case of the second aspect, the force generated in the display part due to gravity does not work in the direction of the stopper part. . Therefore, in the case of the second aspect, the display unit easily swings around the swing axis due to vibration. Therefore, the moving mechanism is operated by the moving mechanism control means to suppress the swing of the display unit. Significant to do.

  Examples of the vibration detection device include those according to claims 3 to 6. According to a third aspect of the present invention, the vibration detection device is an acceleration sensor that detects acceleration of a vehicle. Since the vibration of the vehicle is directly detected by the acceleration sensor, the acceleration sensor can be used as the vibration detection device.

  According to a fourth aspect of the present invention, the vibration detection device includes a gyro sensor that detects an angular velocity in a predetermined direction of the vehicle, and an acceleration calculation unit that calculates an acceleration based on the angular velocity of the vehicle detected by the gyro sensor. . The gyro sensor detects the angular velocity of the vehicle. Since the acceleration is obtained by differentiating the velocity, the acceleration, that is, the vibration of the vehicle can be detected as in the fourth aspect.

  According to a fifth aspect of the present invention, the vibration detection device includes a vehicle speed sensor that detects a vehicle speed, and acceleration calculation means that calculates an acceleration based on the vehicle speed detected by the vehicle speed sensor. As described above, since the acceleration can be calculated by differentiating the speed, the acceleration, that is, the vibration of the vehicle can be detected even in the fifth aspect.

  In a sixth aspect of the present invention, the vibration detection device detects a vibration of the vehicle based on a change in the magnitude of road noise included in a microphone provided in a predetermined part of the vehicle and a sound detected by the microphone. And a detecting means. The main cause of the vibration of the vehicle is that the vehicle travels on an uneven road surface, and node noise occurs when the vehicle travels on an uneven road surface. The vibration of the vehicle can be detected.

  Further, when an acceleration sensor is provided as the vibration detection device as described in claim 3, it is preferable to control the moving mechanism based on acceleration in the moving direction by the moving mechanism as in claim 7.

  That is, the invention according to claim 7 is the vehicle display device according to claim 3, wherein the moving mechanism moves the display unit in a vehicle front-rear direction, and the moving mechanism control means includes The moving mechanism is operated based on the fact that the vibration in the vehicle front-rear direction detected by the acceleration sensor is greater than or equal to a predetermined value.

  Thus, if the moving mechanism is controlled based on the acceleration in the moving direction of the moving mechanism, the movement of the display unit can be suppressed more reliably.

  According to the first to seventh aspects of the present invention, it is possible to suppress the display unit from moving to the side opposite to the stopper part due to vibrations.

  The invention according to claim 8 is the vehicular display device according to any one of claims 1 to 7, further comprising a position detector for detecting a position of the display unit, wherein the moving mechanism control means Based on the fact that the detector detects that the display unit has shifted from the abutting position where it abuts against the stopper unit, control is also performed to control the moving mechanism to return the display unit to the abutting position. It is characterized by being.

  In this way, even if the position of the display unit is shifted from the collision position due to vibration, the movement mechanism is controlled by the movement mechanism control means, and the position of the display unit is returned to the collision position. The position of the display unit is securely held at the collision position.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a side view showing a part of the configuration of an in-vehicle navigation device 10 including a display device to which the present invention is applied, and FIG. 2 is a cross-sectional view taken along the line II-II in FIG.

  The in-vehicle navigation device 10 is fitted into an attachment hole formed at an intermediate position between the driver's seat and the passenger seat on the dashboard, for example. The display unit 12 is arranged such that a display surface (not shown) constituted by a liquid crystal display or the like is on the occupant side. In the state shown in FIGS. 1 and 2, the display unit 12 is fitted into a housing 14 indicated by a two-dot chain line. ing.

  The housing 14 has a rectangular parallelepiped shape that is open on the side where the display unit 12 is disposed, and the bottom plate portion 14a of the housing 14 protrudes vertically upward with respect to the bottom plate portion 14a. A strip 14b is formed. The protruding portion 14b functions as a stopper portion. In the state shown in FIGS. 1 and 2, the protruding portion 14b is abutted against the display unit 12.

  In the present embodiment, it is assumed that the bottom plate portion 14a is disposed in parallel with the horizontal plane. Accordingly, the protrusion 14b is parallel to the vertical plane. Further, the display unit 12 is also parallel to the vertical plane in a state where it is brought into contact with the ridge 14b.

  As shown in FIG. 2, the protrusion 14b is formed in parallel with the vehicle width direction from one side plate 14c of the housing 14 to the other side plate 14d. In the pair of side plate portions 14c and 14d, vertical groove portions 14e are formed at positions facing the display portion 12 in the vicinity of the opening of the housing 14, respectively.

  On the upper part of the side surface of the display unit 12 that faces the side plate portions 14c and 14d, there are formed projections 12a that fit into the groove portions 14e formed in the side plate portions 14c and 14d, respectively. Further, a swing shaft 12b whose tip is enlarged in diameter is projected perpendicularly to the side surface at the lower part of the pair of side surfaces on which the projections 12a are formed.

  One of the swing shafts 12b is fitted into a hole formed at the tip of the connecting plate 16, and the connecting plate 16 and the swing shaft 12b are relatively rotatable and substantially in the vehicle front-rear direction. Relative movement is impossible. The connecting plate 16 is formed integrally with the rack 18, and the connecting plate 16 protrudes from one end of the rack 18 in the longitudinal direction.

  The rack 18 is arranged so that the tooth surface is on the side opposite to the side plate portion 14d. The side surface opposite to the tooth surface of the rack 18 is brought into contact with one side surface of the guide plate 20 fixed to the bottom plate portion 14a in parallel with the side plate portion 14d.

  A pinion gear 22 meshes with the rack 18. The pinion gear 22 is also meshed with the wheel 24. Note that the pinion gear 22 and the wheel 24 are rotatably fixed to the bottom plate portion 14 a of the housing 14. A worm gear 28 is formed by the wheel 24 and the worm 26, and the worm 26 is provided on the shaft of the motor 30.

  Further, the swinging shaft 12b provided on the other side surface of the display unit 12 is fitted in a hole formed at the tip of the guide plate 32, and the guide plate 32 and the swinging shaft 12b are relatively rotatable. In addition, the relative movement in the vehicle longitudinal direction is impossible. The guide plate 32 penetrates a longitudinal support member 34 parallel to the vehicle front-rear direction, and the guide plate 32 and the support member 34 are relatively movable in the longitudinal direction. Further, the support member 34 is fixed to the bottom plate portion 14 a of the housing 14.

  Thus, when the worm 26 is rotated by the rotation of the motor 30, the wheel 24 and the pinion gear 22 are rotated, whereby the rack 18 and the connecting plate 16 integrated with the rack 18 are The vehicle is moved in the vehicle front-rear direction while being guided by the guide plate 20. Further, as the connecting plate 16 moves, the lower portion of the display unit 12 connected by the connecting plate 16 and the swing shaft 12b is moved in the vehicle front-rear direction. Therefore, in the present embodiment, the moving mechanism 35 is configured by the motor 30, the worm gear 28, the pinion gear 22, and the rack 18. Since the other swing shaft 12b is guided in the vehicle longitudinal direction by the guide plate 32, the lower portion of the display 12 is moved in the vehicle longitudinal direction while maintaining a state parallel to the vehicle width direction.

  A non-contact potentiometer 36 fixed on the bottom plate portion 14a of the housing 14 at a position facing the base end surface of the rack 18 sequentially detects the position of the rack 18, that is, the position of the lower portion of the display unit 12. To do. The potentiometer 36 corresponds to a position detector.

  On the other hand, the upper portion of the display unit 12 is movable only in the vertical direction because the pair of protrusions 12a are fitted in the groove portions 14e formed in the pair of side plate portions 14c and 14d, respectively. Accordingly, when the lower part of the display unit 12 moves in the vehicle front-rear direction, the upper part of the display unit 12 moves in the vertical direction. As a result, the display unit 12 swings around the swing shaft 12b, and the angle with respect to the vertical plane including the swing shaft 12b changes.

  Therefore, the angle of the display unit 12 can be adjusted by operating the moving mechanism 35. After the angle is adjusted, the angle of the display unit 12 is maintained by the gear ratio of the worm gear 28 and the like. FIG. 3 is a diagram illustrating a state in which the angle of the display unit 12 is adjusted. As described above, when the angle of the display unit 12 is adjustable, the display surface of the display unit 12 can be set to an occupant's preferred angle, and a disk entrance / exit is provided in the housing 14. It is also possible to hide the disk entrance / exit by the display unit 12 and to incline the display unit 12 to expose the disc entrance / exit only when necessary.

  FIG. 4 is a block diagram showing an electrical configuration for adjusting the angle of the display unit 12 in the vehicle-mounted navigation device 10. As shown in FIG. 4, the in-vehicle navigation device 10 includes a control device 40, an operation button 50, an acceleration sensor 52, and a motor drive circuit 54 in addition to the configuration described above.

  The control device 40 is a so-called computer having a CPU, a ROM, a RAM, an I / O port, and the like, and includes a position determination unit 41, a holding position setting unit 42, a vibration amount determination unit 43, and a moving mechanism control unit 44. Yes. These means are implemented by the CPU executing a program stored in the ROM while utilizing the temporary storage function of the RAM. The contents of these means will be described later.

  The operation button 50 is operated to input an operation signal for adjusting the angle of the display unit 12 to the control device 40. When the display unit 12 is directly moved by hand, the angle is adjusted. In addition, an operation is performed to set the angle as a holding position.

  The acceleration sensor 52 functions as a vibration detection device. The acceleration sensor 52 uses a uniaxial acceleration sensor in the present embodiment, and is installed at a predetermined portion in the vehicle to detect acceleration in the vehicle longitudinal direction. The motor drive circuit 54 performs on / off control of the motor 30 and control of the rotation direction of the motor 30 based on a signal from the control device 40.

  Next, each unit of the control device 40 will be described. The position determination unit 41 determines the position of the display unit 12 based on the signal from the potentiometer 36. The holding position setting unit 42 holds the position of the display unit 12 determined by the position determination unit 41 when the operation ends when the position (that is, the angle) of the display unit 12 is adjusted by an operation signal from the operation button 50. Set as position. When the display unit 12 is directly moved by hand and a signal instructing to set the current position as the holding position is input from the operation button 50, the position determination unit 41 is input when the signal is input. The position determined by is set as the holding position.

  Based on the signal from the acceleration sensor 52, the vibration amount determination unit 43 sequentially determines the vibration amount in the vehicle front-rear direction at a predetermined short period using, for example, a preset relationship between the acceleration and the vibration amount. Based on the operation signal from the operation button 50, the moving mechanism control unit 44 controls the drive circuit 54 to turn on and off the motor 30 and controls the rotation direction of the motor 30. In addition, the movement mechanism control means 44 determines that the position of the display unit 12 determined by the position determination unit 41 is the position shown in FIGS. If it is (hereinafter, this position is referred to as an abutting position), the holding position is determined as the abutting position and the next first control is executed. On the other hand, when the holding position of the display unit 12 is set to a position different from the collision position by the holding position setting means 42, the second control described later is executed.

  In the first control, it is sequentially determined whether or not the vibration amount sequentially determined by the vibration amount determination means 43 is equal to or greater than a predetermined value, and when it is determined that the vibration amount is equal to or greater than the predetermined value, the display unit A signal for driving the motor 30 in the direction of pulling 12 in the direction of the protrusion 14 b is output to the motor drive circuit 54. Thereby, it can suppress that the position of the display part 12 shifts | deviates from a collision position by vibration. The driving time of the motor 30 at this time is set to a relatively short time (for example, 100 milliseconds). If the driving time of the motor 30 is set to a short time in this way, the driving sound of the motor 30 overlaps with the sound generated due to the vibration of the vehicle in time, so that it is difficult for the passenger to hear the operating sound of the motor 30. Become. Therefore, it is less likely that the occupant feels the operating sound of the motor 30 uncomfortable. Further, the torque of the motor 30 may be a preset constant value, or may be a larger torque as the vibration amount is larger.

  Further, in the first control, when the position determination means 41 determines that the position of the display unit 12 has shifted from the collision position, the drive circuit 54 is controlled to bring the display unit 12 to the collision position. Pull back. As a result, the display unit 12 is more reliably held at the abutting position.

  On the other hand, in the second control, the current position of the display unit 12 sequentially determined by the position determination unit 41 and the holding position of the display unit 12 set by the holding position setting unit 42 are sequentially compared in a predetermined short cycle. To do. If it is determined that the current position and the holding position are deviated, a signal for returning the display unit 12 to the holding position is output to the motor drive circuit 54. Thus, for example, as shown in FIG. 3, even when the position of the display unit 12 is a position different from the collision position, the position of the display unit 12 is maintained.

  As mentioned above, although embodiment of this invention was described, this invention is not limited to the above-mentioned embodiment, The following embodiment is also contained in the technical scope of this invention, and also the summary other than the following is also included. Various modifications can be made without departing from the scope.

  For example, in the above-described embodiment, the acceleration sensor 52 is provided as the vibration detection device. However, as shown in FIG. 5, a vibration detection device including a gyro sensor 56 and acceleration calculation means 45 is provided instead of the acceleration sensor 52. May be. The gyro sensor 56 determines the relative azimuth of the vehicle by detecting the angular velocity of the vehicle. The acceleration calculating means 45 is a means implemented by the control device 40, and calculates the acceleration by differentiating the angular velocity signal from the gyro sensor 56. In this case, the vibration amount determining means 46 sequentially determines the vibration amount based on the acceleration calculated by the acceleration calculating means 45. As the gyro sensor 56, various known vibration gyros such as a tuning fork type can be used.

  In FIG. 5, a vehicle speed sensor may be used instead of the gyro sensor 56. The gyro sensor 56 and the vehicle speed sensor are common in that the speed is detected. Since acceleration can be obtained by differentiating the speed, a vehicle speed sensor can be used instead of the gyro sensor 56.

  Furthermore, as shown in FIG. 6, instead of the acceleration sensor 52, a vibration detection device including a microphone 58 and noise change detection means 47 may be provided. The microphone 58 is installed at a predetermined position inside the vehicle interior or outside the vehicle interior. The noise change detection means 47 is a means implemented by the control device 40. For example, road noise is extracted from the sound detected by the microphone 58 by extracting a signal having a predetermined frequency or less, and the extracted road noise is extracted. The rate of change is calculated sequentially. The magnitude of road noise changes finely in a relatively short cycle in response to vehicle vibrations when driving on a gravel road where the vehicle vibrates in a relatively short cycle, and the vehicle steps on a stone or other protrusion. Therefore, even if it temporarily vibrates greatly, it will change temporarily corresponding to the vehicle vibration. That is, the magnitude of the road noise varies corresponding to the vehicle vibration, so that the vehicle vibration can be detected from the rate of change of the road noise. Note that the vibration amount determination unit 48 in FIG. 6 sequentially calculates the vibration amount from the road noise change rate calculated by the noise change detection unit 47 using a preset relationship between the change rate and the vibration amount. decide.

  Further, the acceleration sensor 52 used in the above-described embodiment is a uniaxial acceleration sensor. However, as the acceleration sensor, a biaxial or triaxial sensor can be used. 43 extracts the acceleration in the vehicle longitudinal direction, which is the moving direction of the display unit 12, from the signal from the acceleration sensor, and determines the amount of vibration based on the extracted acceleration in the vehicle longitudinal direction. However, since the position of the display unit 12 may be displaced due to vibration in a direction different from the moving direction of the display unit 12, the amount of vibration can be determined by adding the acceleration in the remaining axial direction. Good.

  Further, the display unit 12 of the above-described embodiment has a lower part movable in the vehicle front-rear direction and an upper part movable in the vertical direction, thereby adjusting the angle of the display unit 12. However, the movement of the display unit 12 may be only rotational movement, that is, it may be rotatable around a predetermined rotation axis that cannot be moved. Further, the display unit 12 may be moved only in parallel without providing a rotation axis (oscillation axis).

It is a side view which shows a part of structure of the vehicle-mounted navigation apparatus 10 provided with the display apparatus with which this invention was applied. It is the II-II sectional view taken on the line of FIG. It is a figure which illustrates the state where the angle of the display part 12 was adjusted. FIG. 3 is a block diagram showing an electrical configuration for adjusting the angle of the display unit 12 in the in-vehicle navigation device 10. FIG. 5 is a diagram showing an electrical configuration for adjusting the angle of the display unit 12, and is a block diagram showing a configuration different from FIG. 4. FIG. 6 is a diagram showing an electrical configuration for adjusting the angle of the display unit 12, and is a block diagram showing a configuration different from those shown in FIGS. 4 and 5.

Explanation of symbols

10: In-vehicle navigation device 12: Display unit 12b: Oscillating shaft 14b: Projection (stopper)
35: Movement mechanism 36: Potentiometer (position detector)
40: control device 44: moving mechanism control means 45: acceleration calculation means 47: noise change detection means 52: acceleration sensor 56: gyro sensor 58: microphone

Claims (8)

A vehicle display device comprising a display unit and a moving mechanism for moving the display unit in a predetermined direction,
A vibration detection device for sequentially detecting vehicle vibration;
A stopper portion that prevents movement of the display portion to one side by abutting with the display portion;
Based on the fact that the vibration detected by the vibration detection device is greater than or equal to a predetermined value while the display unit is in contact with the stopper unit, the movement in the direction in which the display unit moves to the stopper unit side And a moving mechanism control means for operating the mechanism. Having a rocking shaft as a rocking center of the display unit;
The display unit is parallel to a vertical plane including the axis of the swing shaft in a state where the display unit is in contact with the stopper unit, or an upper part of the display unit is opposite to the stopper unit with respect to a lower part. The vehicular display according to claim 1, wherein the vehicular display projects.   The vehicle display device according to claim 1, wherein the vibration detection device is an acceleration sensor that detects an acceleration of the vehicle.   The vibration detection device includes a gyro sensor that detects an angular velocity of a vehicle in a predetermined direction, and acceleration calculation means that calculates an acceleration based on the angular velocity of the vehicle detected by the gyro sensor. The vehicle display device according to 1 or 2.   3. The vehicle according to claim 1, wherein the vibration detection device includes a vehicle speed sensor that detects a vehicle speed, and acceleration calculation means that calculates an acceleration based on the vehicle speed detected by the vehicle speed sensor. Display device.   The vibration detection device includes a microphone provided in a predetermined part of the vehicle, and noise change detection means for detecting the vibration of the vehicle based on a change in the magnitude of road noise included in the sound detected by the microphone. The vehicular display device according to claim 1, wherein the vehicular display device is a vehicular display device. The vehicle display device according to claim 3,
The moving mechanism moves the display unit in the vehicle front-rear direction,
The vehicle display device, wherein the moving mechanism control means operates the moving mechanism on the basis that a vibration in the vehicle front-rear direction detected by the acceleration sensor is a predetermined value or more. A position detector for detecting the position of the display unit;
The moving mechanism control means controls the moving mechanism to control the display unit based on the fact that the position detector detects that the display unit has shifted from the abutting position where it abuts the stopper unit. The vehicle display device according to any one of claims 1 to 7, wherein control for returning to the collision position is also executed.

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