Denso Corporation

Tatsuya Sasaki

Hideyuki Nakane

Kazuhide Ohta

Shigenori Yokochi

An indicator instrument for a vehicle includes a rotational indicator that indicates a vehicle state parameter, and a stepper motor that rotates the rotational indicator. The stepper motor includes an output gear, a reduction mechanism, a motor casing housing the output gear and the reduction mechanism. The output gear includes an output shaft rotatable together with the rotational indicator, and a last-stage gear extending radially outward from the output shaft. The reduction mechanism includes a reduction gear engaged with the last-stage gear. The rotational indicator includes a rotational shaft press-fitted to a specified portion of the output shaft in the motor casing. The specified portion is displaced from the last-stage gear in an axial direction of the output shaft.

Indicator instrument for vehicle

A step motor that drives a rotary body to rotate includes: an output shaft that outputs a rotational driving force to the rotary body, the output shaft having an insertion hole in which the rotary body is arranged so as to be integrally rotatable on an inner circumference side of a top portion of a tip end of the output shaft; a radial bearing radially supporting the output shaft from an outer circumference side; and a cover protruding from the radial bearing radially inward. The cover opposing the top portion through an axial gap at an outer circumference side of the insertion hole. The output shaft has an inner tapered portion which decreases in diameter as approaching the insertion hole radially inward from the top portion. The cover opposes the top portion through the axial gap at an outer circumference side of the inner tapered portion.

Step motor and indicator instrument for vehicle

A step motor that rotationally drives a rotating body includes: an output gear having an output shaft that rotates around a rotation center line together with the rotating body, and a final gear extending radially outward from the output shaft; a radial bearing having an inner circumference side that radially supports the output shaft, on one side of the final gear in an axial direction; a reduction gear mechanism having a first reduction gear meshed with the final gear, and a second reduction gear meshed with the first reduction gear on the one side of the final gear in the axial direction; and a protrusion protruding from the radial bearing toward the other side in the axial direction, in a specific area extending from a longitudinal cross section of the output gear including the rotation center line to an opposite side away from the first reduction gear.

A head-up display device includes an optical unit that includes a drivable reflecting mirror and adjusts a virtual image display position by driving the mirror, a reduction gear mechanism rotatably including transmission gears, a resilient member that generates restoring force in a direction to engage the gears, and a control unit controlling a rotational position of the stepping motor based on an adjustment command by a vehicle occupant. At least one gear predicted to incur a creep deformation is a specific gear. An environmental temperature of the specific gear where the deformation is predicted is a predicted deformation temperature. A deviation predicted to be caused at the display position by the deformation at the predicted deformation temperature is a predicted display deviation. The control unit corrects the rotational position in a direction to reduce the predicted display deviation when the environmental temperature rises to the predicted deformation temperature or higher.

Head-up display device

A HUD device mounted on a moving body that projects an image on a projection member to virtually display the image includes a projector, a reflector mirror, a stepper motor, a reduction gear mechanism that reduces rotation which is output from the stepper motor and transmitted to the reflector mirror, and a controller that calculates a control step angle for the stepper motor. The controller, when an output direction of the motor according to the control instruction at this determination is the opposite direction as a direction of the rotation of the last time, adds a reverse step angle of the opposite direction, which is equal to or greater than a sum of a reference step angle and a backlash angle of the reduction gear mechanism, to the control step angle.

A vehicle head-up display device includes a stepping motor that outputs a rotation to adjust an optical position of a reflecting mirror, a zero detection unit that detects a zero position by the rotation of the stepping motor in a return-to-zero direction, an initial adjustment unit that adjusts the optical position to an initial position based on the zero position by the rotation of the stepping motor in an away-from-zero direction, and a user adjustment unit that, after the adjustment of the initial position, adjusts the optical position to a command position based on the zero position responsive to a command from the vehicle user. The zero detection unit sets a higher rotation speed of the stepping motor than the user adjustment unit, and sets a lower output torque than the user adjustment unit.

Vehicle headup display device

A resin portion of an output shaft has a large diameter section, from which one end portion of a rod outwardly projects, and an intermediate diameter section, which extends from the large diameter section in an axial direction and is rotatably supported by a housing. A gear portion is formed in an outer peripheral surface of the large diameter section and is meshed with a final gear. A recess is recessed in the axial direction in the large diameter section and extends in the circumferential direction along an entire circumferential extent of the rod. The intermediate diameter section is continuously filled with resin in a region, which extends from an outer peripheral surface of the rod to an outer peripheral surface of the intermediate diameter section in the radial direction, along the entire circumferential extent of the rod.

Stepper motor

A vehicular head-up display device is provided. The vehicular head-up display device includes: a reflector for reflecting display light, which is emitted from a display, to a windshield to display a virtual image; a stepper motor for rotating the reflector and a controller for controlling the stepper motor to control a rotation position of the reflector. When a driver changes a request position of the virtual image to a new position in a direction toward a reset position and the ignition switch is turned off, the controller rotates the stepper motor to change the position of the virtual image to the reset position and thereafter instructs the stepper motor to rotate by a specified angle corresponds to a hysteresis generated at a time of a change in the rotation direction of the reflector between a forward rotation direction and backward rotation direction.

Vehicular head-up display device

A HUD device includes a stepper motor, which rotates a reflection mirror for adjusting a display position of a virtual image. The stepper motor has an electric stabilization point and a mechanical stabilization point. A control system controls a drive signal for the stepper motor in response to an adjustment instruction. Pole teeth of a specified phase, which provides a greater magnetic attraction force with the rotor when not powered than by pole teeth of other phase, is set as stabilization pole teeth. The control system continues to apply the drive signal until the target stabilization point is attained even after the adjustment instruction is stopped. The target stabilization point is set to the electric stabilization point, at which the holding torque is provided by the stabilization pole teeth of the specified phase.

Head-up display device for vehicle

A HUD device includes a stepper motor, which rotates a reflection mirror for adjusting a display position of a virtual image. The stepper motor has an electric stabilization point and a mechanical stabilization point. A control system controls a drive signal for the stepper motor to change by a step angle at every predetermined period Ts in response to an adjustment instruction inputted from an adjustment switch. The control system continues to apply the drive signal until the electric stabilization point is attained even after the adjustment instruction is stopped to operate the stepper motor in a powered rotation mode. The stepper motor then operates in an inertia rotation mode toward the mechanical stabilization point is attained.

A reflection unit reflects an image indicated on an indicator and projects the image on a combiner to indicate a virtual image of the image at a position viewable for a user. A stepping motor rotates the reflection unit to move the virtual image continuously in a predetermined section of the combiner. A control unit controls a driving power of the stepping motor such that a smoothness parameter becomes less than a predetermined value. The smoothness parameter is defined by a division of a difference between the maximum speed of the virtual image and an average speed of the virtual image, when the virtual image moves continuously in the predetermined section, by the average speed.

Headup display device and method for controlling the same

A head up display device for a vehicle includes a display; an optical system having a reflecting mirror; a stepping motor; and a control system having a determining device, a micro-step control device, and a forcible control device. The determining device determines whether an adjustment command for micro-step control is given. The micro-step control device performs the micro-step control as long as the determining device determines that the command for the micro-step control is given. The forcible control device forcibly controls a drive signal such that an electrical angle changes to a stabilizing point. When determination made by the determining device switches from determination that the command is given to determination that the command is not given, the forcible control device forcibly controls the drive signal, provided that the electrical angle as of the time of the determination that the command is not given is shifted from the stabilizing point.

Head up display device for vehicle

A head up display device includes a display, an optical system having a reflecting mirror, a motor, and a reduction gear mechanism having gears in engagement with each other. A stopper gear is further on a preceding side than the last gear in the mechanism. The stopper gear includes a partial gear portion having teeth arranged in a region of the stopper gear in a range of less than 360 degrees in its rotational direction. Rotation of the stopper gear is stopped by engagement of both-end teeth of the partial gear portion with a stopper-adjacent gear, so a range of a rotation angle of the mirror is limited to a predetermined adjustable range, which includes a displayable range. The angle between an adjustable range lower limit and displayable range lower limit, and the angle between an adjustable range upper limit and displayable range upper limit are larger than 0 degree.

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Chiryu, Japan

Tatsuya Sasaki