JP6670445B2 - In-vehicle projector - Google Patents

Description

  The present invention relates to an on-vehicle projection device mounted on a vehicle and provided with a reflection member for projecting a display image.

  2. Description of the Related Art As a conventional in-vehicle projection device, for example, the one described in Patent Document 1 is known. This on-vehicle projector has a reflection unit (reflection unit) having a reflection unit including a display unit (display unit) having, for example, a light source and a liquid crystal panel, and a mirror in a housing (housing) in which an emission unit is formed as a head-up display device. ), The display light (display image) of the display unit is reflected by the reflection unit, and a predetermined irradiation member and a windshield of an automobile are radiated through the emission unit to perform projection display.

  The reflection unit is held through a holder, and is provided rotatably about a predetermined rotation axis so that the position of a display image irradiated on a windshield as an irradiation member can be adjusted by moving the position. At this time, the holder is provided with a pair of shaft portions (rotation shafts) projecting around along the rotation axis, while the housing side is provided with a pair of bearing portions for supporting the pair of shaft portions. The reflection unit held through the holder is rotatable by holding these shafts in bearings.

JP 2006-248322 A

  These on-vehicle projectors sometimes require a large display screen, and accordingly, the size of the reflection unit tends to increase. When the size of the reflection unit is increased, the frictional resistance between the shaft portion and the bearing portion of the reflection unit is increased, so that there is a problem that smooth rotation cannot be obtained. In particular, it is desired that the in-vehicle projection device smoothly rotate the reflecting portion without generating abnormal noise even if there is a vibration or a thermal effect accompanying the traveling.

  For example, the reflection part and the bearing part vibrate due to the vibration accompanying the traveling of the vehicle, and there is a possibility that an abnormal noise is generated or a smooth rotation cannot be performed.

  Accordingly, an object of the present invention is to provide an on-vehicle projection device that focuses on the above-described problem and prevents generation of abnormal noise from a reflection unit.

The vehicle-mounted projection device according to the present invention includes:
In the housing where the emission part is formed,
Display means for outputting display light,
Reflecting means for providing a reflecting portion for reflecting the display light to the emitting portion side and a pair of rotating shafts protruding at both ends of the reflecting portion,
On one side of the pair of rotation shafts, a driving unit that adjusts a reflection angle by the reflection unit by rotating the rotation shaft,
On both sides of the pair of rotating shafts, a rolling bearing having an inner ring through which the rotating shaft is inserted and an outer ring held on the housing side,
With
The rolling bearing has a lubricant that lubricates the inner ring and the outer ring and the ball inside the cover,
The lubricant has a viscosity of 16 centistokes or more at an ambient temperature of 40 degrees Celsius,
The rotary shaft is press-fitted into the inner race of the rolling bearing and assembled.

Further, at a position where the rotating shaft and the inner ring of the rolling bearing are in contact with each other,
The outer diameter of the rotating shaft is set to be larger by 5 to 18 micrometers than the diameter of the hole of the inner ring before the assembly.

  Further, a bearing holding portion having an opening in which the rolling bearing fits is further provided,
The rolling bearing is housed in the opening in a direction in which the reflection unit is located,
The opening has a wall that defines a position of the rolling bearing,
The wall has a window such that the bearing can be viewed from the reflecting means,
The rotating shaft has a flange portion for fixing the rotating shaft when press-fitting the bearing,
The flange portion and the wall portion extend so as to narrow the window portion.

  Also, a plurality of rolling bearings are provided on one of the rotating shafts between the reflecting means and the driving means.

  The present invention provides an in-vehicle projection device that prevents generation of abnormal noise from a reflection unit.

1 is a schematic diagram of a head-up display device according to an embodiment of the present invention. FIG. 3 is an exploded perspective view of the reflection unit in the embodiment. The figure which shows the reflection unit in the embodiment. Sectional drawing which shows the support part in the embodiment. FIG. 3 is a diagram showing a main part of the reflection unit in the embodiment. Sectional drawing which shows before the assembly of the support part in the embodiment. Sectional drawing which shows the state after assembling of the support part in the embodiment.

  Hereinafter, an embodiment in which the vehicle-mounted projection device of the present invention is applied to a head-up display device that projects a display image on a windshield of a vehicle will be described with reference to the drawings.

  1, a head-up display device (vehicle-mounted projection device) A according to the present embodiment is mounted on, for example, an automobile, and includes a housing (housing) 1, a display unit (display means) 2, and a backlight unit 3. , A plane mirror 4, a reflection unit (reflection unit) 5, and an actuator (drive unit) 6, generated through the display unit 2 and the backlight unit 3 and reflected through the plane mirror 4 and the reflection unit 5. The display light (display image) L is applied to the windshield (windshield) 7 of the vehicle to perform display, and examples of display contents include various vehicle information and navigation (route guidance) information.

  The housing 1 is made of, for example, a black synthetic resin, and accommodates the display unit 2, the backlight unit 3, the plane mirror 4, the reflection unit 5, and the actuator 6 inside, and displays the display light on the side facing the windshield 7. An emission part 8 for emitting L toward the windshield 7 is formed, and the emission part 8 is covered with a light-transmitting cover 9. In addition, the accommodation space of each component can be formed by combining portions made of a metal material such as aluminum in consideration of thermal deformation and heat radiation as the housing. In addition, a housing can be formed by combining housings enclosed for each unit.

  The display unit 2 includes a display element formed of, for example, a liquid crystal display panel that forms a display image (display light) L by receiving light from the backlight unit 3 and is fixed to the housing 1.

  The backlight unit 3 includes a light source substrate, a light source, a lens member, a case, and the like, and is attached to and fixed to the housing 1 behind the display unit 2.

  The plane mirror 4 reflects the display light L from the display unit 2 toward the reflection unit 5.

  The reflection unit 5 reflects the display light (display image) L incident through the plane mirror 4 toward the emission unit 8 and is configured to be rotatable about a rotation axis described later with the operation of the actuator 6. The display light L reflected by the reflection unit 5 passes through the translucent cover 9 provided in the emission unit 8 and is irradiated on the windshield 7 to be visually recognized by the occupant P as a virtual image.

  The actuator 6 includes, for example, a stepping motor, and is fixed to the housing 1 while being connected to the rotation shaft 521 of the reflection unit 5 through a plurality of gears.

  Next, the reflection unit 5 will be described with reference to FIGS. The reflection unit 5 has a reflection section 51, a holder 52, and a support section 53.

  The reflection section 51 is, for example, a concave mirror in which a reflection film is formed on a surface of a base material made of a synthetic resin material by means such as vapor deposition. The reflecting surface of the reflecting portion 51 has a curved surface corresponding to the shape of the windshield 7 and also has a function of correcting a distortion of a virtual image viewed from the occupant P.

  The holder 52 is made of, for example, a black metal material, and is provided with a mounting table 522 on which the rotating shaft 521 and the reflecting portion 51 projecting from both ends are mounted. In this case, the reflection section 51 is fixed to the mounting table 522 with a double-sided tape or the like. Further, on both sides of the rotating shaft 521, a ball bearing (rolling bearing) 54 for supporting the rotating shaft 521 by being inserted therethrough and a bearing holding portion 55 for holding the ball bearing 54 at a predetermined position of the housing 1 are provided. I have.

  The support portion 53 includes a ball bearing 54 and a bearing holding portion 55, which are assembled beforehand, inserted through the rotating shaft 521, and further held by the housing 1. The support portion 53 allows the reflection portion 51 to be rotatably supported with respect to the housing 1. In this case, three similar support parts 53 are prepared.

  The ball bearing 54 has a cylindrical outer ring 541, an inner ring 542 provided inside the outer ring 541 and having a hole through which the rotating shaft 521 is inserted, and a smooth rotation interposed between the outer ring 541 and the inner ring 542. A ball 543 for urging, a cover 544 provided to be fitted in the outer ring 541 so as to cover a gap between the inner ring 542 and the outer ring 541, a lubricant 545 for lubricating the inner ring 542, the outer ring 541, and the ball 543 inside the cover 544; , Is provided.

  The bearing holding portion 55 has an opening 551 in which the outer ring 541 of the ball bearing 54 is fitted and fits, a wall portion 552 that defines an assembling position of the outer ring 541, and a bolt 56 for holding the housing 1 at a predetermined position using a bolt 56. And a hole 553.

  The bearing holding portion 55 can hold the ball bearing 54 by being pressed into the opening 551. At this time, the outer ring 541 is pressed and inserted into the ball bearing 54 from the opening side of the opening 551 by a not-shown press-fitting jig, and is press-fitted to a position where it comes into contact with the wall 552. In addition, the press-fitting jig and the wall portion 552 are shaped such that they hit the outer ring 541 and do not hit the inner ring 542, and the assembling method is applied. The pressing force is applied to the inner ring 542, and the ball 543 comes off or is damaged. 54 is prevented.

  The bearing holding portion 55 that houses and holds the ball bearing 54 is press-fitted and assembled while the inner ring 542 of the ball bearing 54 is inserted into the rotating shaft 521.

  The same bearing holding portion 55 that accommodates and holds the ball bearing 54 is provided by being inserted through the rotating shafts 521 on both sides of the reflecting portion 51, and the rotating shaft 521 on the actuator 6 side is provided with another bearing holding portion. A part 55 is provided. Therefore, a plurality of bearing holding portions 55 are provided between the actuator 6 and the reflecting portion 51, and it is difficult to transmit the vibration in the reflecting portion 51 (between the ball bearings 54 on both sides of the reflecting portion 51) to the actuator 6 side. doing.

  As shown in FIG. 5, the actuator 6 includes a motor 61 and a plurality of gears 62, and the rotation of the motor 61 is transmitted to the rotation shaft 521 via the gear 62. One of the gears 62 is provided on the rotating shaft 521 so as to be fitted to the further end side (outside) of the plurality of bearing holding portions 55, and rotates together with the rotating shaft 521. Further, another gear 62 is prepared so that the rotation of the motor 61 is transmitted to this gear 62 at a reduced speed.

  With these configurations, the distance between the bearings of the ball bearings 54 at both ends is increased with the enlargement of the reflection portion 51, and the mounting table 522 is easily bent due to resonance in response to the vibration of the vehicle. Also, by providing a plurality of ball bearings 54 between the actuator 6 and the reflecting portion 51 as described above, deformation of the rotating shaft 521 can be suppressed, and transmission of vibration to the gear 62 can be suppressed. Thereby, for example, it is possible to prevent a malfunction such as a hitting sound caused by gears hitting each other. Further, even during traveling, the driving force of the motor 61 can be transmitted to the rotating shaft 521 properly, so that the reflecting portion 51 can be smoothly rotated.

  Next, assembling the bearing holding portion 55 that houses and holds the ball bearing 54 to the rotating shaft 521 will be described. As shown in FIGS. 6 and 7, the bearing holding portion 55 is configured such that the inner ring 542 of the ball bearing 54 and the flange portion 521 a are sandwiched between the inner ring 542 of the ball bearing 54 and the jigs B and C for press-fitting. It is press-fitted and assembled while passing through. Note that the outer diameter D1 of the rotating shaft 521 is designed to be larger than the diameter D2 of the hole of the inner ring 542 of the ball bearing 54, so that the holes of the inner ring 542 are expanded by inserting the press-fitting jigs B and C. Into the rotating shaft 521. In this case, the outer diameter D1 of the rotating shaft 521 is set to be 5 to 18 micrometers larger than the diameter D2 of the inner ring 542 before insertion.

  Further, in the assembled state of FIG. 7, as described above, the inner ring 542 is deformed more outward than before the assembling, so that the distance between the inner ring 542 and the ball 543 and the distance between the outer ring 541 and the ball 543 can be reduced. . For this reason, even if there is vibration due to running of the vehicle or the like, rattling due to the ball bearing 54 can be reduced. Further, the outer diameter of the rotating shaft 521 can be dimensioned so that the ball 543 is crushed to the extent that the inner ring 542 can rotate together with the rotating shaft 521 by driving the actuator 6, and in this case, further play is prevented. it can.

  The higher the viscosity of the lubricant 545 in the ball bearing 54, the more the rattling sound of the ball 543 can be reduced. In this case, the lubricant 545 preferably has a viscosity of 16 centistokes or more in a temperature atmosphere of 40 degrees Celsius, based on the mounting environment of the head-up display device A for a vehicle. , Urea grease, fluorine grease, conductive grease and the like can be applied.

  Further, in the assembled state, the wall portion 552 extends so as to narrow the gap between the window portion 554 and the flange portion 521a. Even if a problem occurs in the cover 544, the wall portion 552 and the flange portion 521a may be provided. Thereby, it is possible to prevent the lubricant 545 from being scattered toward the reflecting section 51 side. Further, the structure of the wall portion 552 and the flange portion 521a is a structure that prevents the lubricant 545 from scattering toward the reflection portion 51 even in the air blow step after assembly.

Such a head-up display device A is
A housing (housing) 1 on which a light-transmitting cover (emission part) 9 is formed,
A display unit (display means) 2 for outputting display light L;
A reflecting unit (reflecting means) 5 including a reflecting portion 51 for reflecting the display light L toward the light transmitting cover 9 and a pair of rotating shafts 521 protruding from both ends of the reflecting portion 51;
An actuator (driving unit) 6 that adjusts a reflection angle of the reflection unit 51 by rotating the rotation shaft 521 on one side of the pair of rotation shafts 521;
Ball bearings (rolling bearings) 54 each having an inner ring 542 through which the rotating shaft 521 is inserted and an outer ring 541 held by the housing 1 on both sides of the pair of rotating shafts 521;
The rotating shaft 521 is press-fitted into the inner ring 542 of the ball bearing 54 and assembled.

  Therefore, even if the reflection part 51 becomes large, it can be smoothly rotated using the ball bearing 54. Further, even when the vehicle is running, the structure is such that no abnormal noise is generated between the ball bearing 54 and the rotating shaft 521. In addition, since the rotation shaft 521 can be strongly supported, vibration of the reflection unit 51, the mounting table 522, the actuator 6, and the like can be suppressed, so that generation of abnormal noise from other components can be reduced. Further, the reflecting portion 51 can be smoothly rotated by the actuator 6 without rattling.

  Further, at a position where the rotating shaft 521 and the inner ring 542 of the ball bearing 54 are in contact with each other, the outer diameter D1 of the rotating shaft 521 is set to be larger than the diameter D2 of the hole of the inner ring 542 before the assembly. Therefore, by deforming the inner ring 542, the gap between the components in the ball bearing 54 can be reduced, and abnormal noise generated from inside the ball bearing 54 can be prevented.

  Although the head-up display device A of the present invention has been described as an example in the configuration of the above-described embodiment, the present invention is not limited to this. It goes without saying that various improvements and display changes are possible without departing from the scope of the present invention. For example, in the above-described embodiment, an example in which a liquid crystal panel that forms a display image using irradiation light of the backlight unit 3 is described as an example. Alternatively, a projector system using a DMD (Digital Mirror Device) can be applied. By combining the mirror units, the same effects as those of the above-described embodiment can be obtained.

  INDUSTRIAL APPLICABILITY The present invention is suitable for a head-up display device, for example, as an on-vehicle display device for vehicle information or road information such as turn-by-turn display mounted on a moving object equipped with an automobile or a motorcycle or an agricultural machine or a construction machine. is there.

A. Head-up display device (vehicle projection device)
D1 Outer diameter D2 Diameter 1 Housing (housing)
2 Display unit (display means)
3 backlight unit 4 plane mirror 5 reflection unit (reflection means)
51 Reflector 52 Holder 521 Rotary shaft 53 Support 54 Ball bearing (rolling bearing)
541 Outer ring 542 Inner ring 543 Ball 544 Cover 545 Lubricant 55 Bearing holding portion 551 Opening 552 Wall 553 Hole 554 Window 6 Actuator (drive means)
7 Windshield 8 Emission part 9 Translucent cover (Emission part)

Claims (4)

In the housing where the emission part is formed,
Display means for outputting display light,
Reflecting means for providing a reflecting portion for reflecting the display light to the emitting portion side and a pair of rotating shafts protruding at both ends of the reflecting portion,
On one side of the pair of rotation shafts, a driving unit that adjusts a reflection angle by the reflection unit by rotating the rotation shaft,
On both sides of the pair of rotating shafts, a rolling bearing having an inner ring through which the rotating shaft is inserted and an outer ring held on the housing side,
With
The rolling bearing has a lubricant that lubricates the inner ring and the outer ring and the ball inside the cover,
The lubricant has a viscosity of 16 centistokes or more at an ambient temperature of 40 degrees Celsius,
The on-vehicle projection device, wherein the rotating shaft is press-fitted into the inner ring of the rolling bearing and assembled. At a position where the rotating shaft and the inner ring of the rolling bearing are in contact with each other,
2. The vehicle-mounted projection device according to claim 1, wherein an outer diameter of the rotation shaft is set to be 5 to 18 μm larger than a diameter of a hole of the inner race before the assembly.   Further comprising a bearing holding portion having an opening in which the rolling bearing fits,
The rolling bearing is housed in the opening in a direction in which the reflection unit is located,
The opening has a wall that defines a position of the rolling bearing,
The wall has a window such that the bearing can be viewed from the reflecting means,
The rotating shaft has a flange portion for fixing the rotating shaft when press-fitting the bearing,
The flange and the wall extend to narrow the window.
The vehicle-mounted projection device according to claim 1, wherein:   A plurality of rolling bearings are provided on one of the rotating shafts between the reflecting means and the driving means.
The vehicle-mounted projection device according to claim 1, wherein:

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