JP2017215364A - On-board projection device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an on-board projection device that prevents occurrence of an allophone from a reflection unit.SOLUTION: An on board projection device comprises: a display unit 2 that outputs display light L to a housing 1 having a translucent cover 9 formed; a reflection unit 5 that has a reflection part 51 reflecting the display light L onto a translucent cover 9 side, and a pair of rotary shafts 521 protruding on either side of the reflection part 51 provided; an actuator 6 that causes the rotary shaft 521 to rotate onto one side of the pair of rotary shafts 521 to thereby adjust a reflection angle by thee reflection part 51; and a ball bearing 54 that, on either side of the pair of rotary shafts 521, has an inner race 542 into which the rotary shaft 521 is inserted, and an outer race 541 supported on a housing 1 side. The rotary shaft 521 is assembled with respect to the inner race 542 of the ball bearing 54 by being pressingly fit therewith.SELECTED DRAWING: Figure 6

Description

  The present invention relates to a vehicle-mounted projection device that is mounted on a vehicle and includes a reflecting member for projecting a display image.

  As a conventional on-vehicle projection device, for example, the one described in Patent Document 1 is known. This in-vehicle projection device is a head-up display device in which a reflection unit (reflection means) having a reflection unit including a display unit (display means) having a light source or a liquid crystal panel and a mirror in a housing (housing) in which an emission part is formed. ), And the display light (display image) of the display unit is reflected through the reflection unit, and is projected onto the predetermined irradiation member and the windshield of the automobile through the emission unit to perform projection display.

  The reflection unit is provided through a holder so as to be rotatable about a predetermined rotation axis so that the position of the display image irradiated on the windshield as an irradiation member can be adjusted by moving the position of the display image. At this time, the holder is provided with a pair of shaft portions (rotary shafts) that project to the periphery along the rotation axis, while the housing side is provided with a pair of bearing portions that support the pair of shaft portions, By holding these shaft portions by bearings at the bearing portions, the reflection unit held through the holder is configured to be rotatable.

JP 2006-248322 A

  These on-vehicle projection devices may require a large display screen, and accordingly, the reflection unit tends to increase in size. When the reflection unit is enlarged, the frictional resistance between the shaft portion and the bearing portion of the reflection unit is increased, which causes a problem that smooth rotation cannot be obtained. In particular, the in-vehicle projection device is desired to smoothly rotate the reflecting portion without generating an abnormal sound even when there is a vibration or thermal effect associated with traveling.

  For example, there is a possibility that the reflection part and the bearing part may vibrate due to vibrations caused by the running of the vehicle, and an abnormal noise is generated and smooth rotation cannot be performed.

  Accordingly, an object of the present invention is to provide an in-vehicle projection apparatus that pays attention to the above-described problems and prevents the generation of abnormal noise from the reflection unit.

The in-vehicle projector of the present invention is
In the case 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 to both end sides of the reflecting portion;
Driving means for adjusting a reflection angle by the reflecting portion by rotating the rotation shaft on one side of the pair of rotation shafts;
A rolling bearing having an inner ring through which the rotating shaft is inserted and an outer ring held on the housing side on both sides of the pair of rotating shafts;
With
The rotating shaft is press-fitted and assembled to the inner ring of the rolling bearing.

Moreover, in the location where the said rotating shaft and the said inner ring | wheel of the said rolling bearing contact | connect,
The outer diameter of the rotating shaft is set larger than the diameter of the hole of the inner ring before the assembly.

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

1 is a schematic view of a head-up display device according to an embodiment of the present invention. The disassembled 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. The figure which shows the principal part of the reflection unit in the embodiment. Sectional drawing which shows before the assembly | attachment of the support part in the embodiment. Sectional drawing which shows the assembly | attachment of the support part in the embodiment.

  Hereinafter, an embodiment in which an in-vehicle 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.

  In FIG. 1, a head-up display device (vehicle-mounted projection device) A according to this 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 means) 5, and an actuator (drive means) 6. The plane mirror 4 is generated through the display unit 2 and the backlight unit 3, and is reflected through the plane mirror 4 and the reflection unit 5. The display is performed by irradiating the windshield (windshield) 7 of the vehicle with display light (display image) L, and examples of display contents include various vehicle information and navigation (route guidance) information.

  The housing 1 is made of, for example, black synthetic resin. The housing 1 houses the display unit 2, the backlight unit 3, the plane mirror 4, the reflection unit 5, and the actuator 6, and displays 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 translucent cover 9. Note that the housing space for each component can be formed by combining locations made of a metal material such as aluminum in consideration of thermal deformation and heat dissipation as the housing. Further, a housing enclosed by each unit may be combined to form a housing.

  The display unit 2 includes a display element made of, for example, a liquid crystal display panel that receives light from the backlight unit 3 and forms a display image (display light) L, and is fixedly disposed on the housing 1.

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

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

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

  The actuator 6 is composed of, for example, a stepping motor, and is fixedly attached to the housing 1 in a state of 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 includes a reflection part 51, a holder 52, and a support part 53.

  The reflection part 51 consists of a concave mirror in which a reflection film is formed on the surface of a base material made of a synthetic resin material by means such as vapor deposition. The reflection surface of the reflection part 51 has a curved surface corresponding to the shape of the windshield 7 and also has an effect of correcting the distortion of the virtual image seen from the passenger P.

  The holder 52 is made of, for example, a black metal material, and is formed with a mounting table 522 on which the rotating shaft 521 and the reflecting portion 51 that protrude from both ends are placed. In this case, the reflecting portion 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, there are provided a ball bearing (rolling bearing) 54 that is inserted and supported by the rotating shaft 521, and a bearing holding portion 55 that holds the ball bearing 54 at a predetermined position of the housing 1. Yes.

  The support portion 53 includes a ball bearing 54 and a bearing holding portion 55, which are assembled in advance, inserted through the rotating shaft 521, and further held by the housing 1. The support portion 53 can pivotally support the reflecting portion 51 relative to the housing 1. In this case, three similar support parts 53 are prepared.

  The ball bearing 54 is interposed between the outer ring 541 having a cylindrical shape, an inner ring 542 provided inside the outer ring 541 and having a hole through which the rotation shaft 521 is inserted, and the outer ring 541 and the inner ring 542 to smoothly rotate. An urging ball 543, 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 that lubricates the inner ring 542 and the outer ring 541 and the ball 543 inside the cover 544, It is equipped with.

  The bearing holding portion 55 is configured to hold an opening 551 in which the outer ring 541 of the ball bearing 54 is fitted and fit, a wall portion 552 that defines an assembly position of the outer ring 541, and a bolt 56 at a predetermined position of the housing 1. And a hole portion 553.

  The bearing holding portion 55 can hold the ball bearing 54 by being press-fitted into the opening 551. At this time, the ball bearing 54 is inserted by pressing the outer ring 541 from the opening side of the opening 551 by a press-fitting jig (not shown) until it comes into contact with the wall portion 552. Further, the press fitting jig and the wall portion 552 are applied with a shape and an assembling method so that the outer ring 541 hits the outer ring 541 and does not hit the inner ring 542, and the inner ring 542 is subjected to a pressing force and the ball 543 is detached or damaged. 54 troubles are prevented.

  The bearing holding portion 55 that stores 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.

  A similar bearing holding portion 55 that stores and holds the ball bearing 54 is provided by being inserted into the rotating shafts 521 on both sides of the reflecting portion 51, and another rotating shaft 521 on the actuator 6 side is provided with another bearing holding portion. A portion 55 is provided. Accordingly, a plurality of bearing holding portions 55 are provided between the actuator 6 and the reflection portion 51, and it is difficult to transmit vibrations at the reflection portion 51 (between the ball bearings 54 on both sides of the reflection 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 rotating shaft 521 via the gear 62. One of the gears 62 is provided to be fitted to the end side (outside) of the plurality of bearing holding portions 55 on the rotation shaft 521, and rotates together with the rotation shaft 521. Further, another gear 62 is prepared so that the rotation of the motor 61 is transmitted to the gear 62 at a reduced speed.

  With these configurations, the distance between the shaft supports by the ball bearings 54 at both ends is increased with the increase in the size of the reflecting portion 51, and the mounting table 522 is easily bent due to resonance with the vibration of the vehicle. In addition, as described above, by providing the plurality of ball bearings 54 between the actuator 6 and the reflecting portion 51, it is possible to suppress the deformation of the rotating shaft 521 and to suppress the vibration from being transmitted to the gear 62 side. As a result, for example, it is possible to prevent problems such as hitting of gears and generating a hitting sound. Further, since the driving force of the motor 61 can be properly transmitted to the rotating shaft 521 even during traveling, the reflecting portion 51 can be smoothly rotated.

  Next, assembling the bearing holding portion 55 that stores 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 so that the inner ring 542 of the ball bearing 54 and the flange portion 521 a are sandwiched between the inner shaft 542 and the flange portion 521 a using the press-fitting jigs B and C, and the rotating shaft 521 It is press-fitted while being inserted into and assembled. The outer diameter D1 of the rotary shaft 521 is designed to be larger than the diameter D2 of the hole of the inner ring 542 of the ball bearing 54, and the hole of the inner ring 542 is pushed and expanded by sandwiching the press-fitting jigs B and C. In this way, it is press-fitted into the rotary shaft 521. In this case, the outer diameter D1 of the rotating shaft 521 is set to a size that is 5 to 18 micrometers larger than the diameter D2 of the inner ring 542 before insertion.

  In the assembled state of FIG. 7, as described above, the inner ring 542 is deformed to the outside before the assembly, 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 by the ball bearing 54 can be reduced. Furthermore, the outer diameter of the rotating shaft 521 can be sized so that the ball 543 can be crushed so that the inner ring 542 can be rotated together with the rotating shaft 521 by driving the actuator 6, and in this case, rattling is further prevented. it can.

  Further, the higher the viscosity of the lubricant 545 in the ball bearing 54, the more the rattling noise 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 vehicles. Urea grease, fluorine grease, conductive grease, etc. 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. Therefore, the lubricant 545 can be prevented from scattering toward the reflecting portion 51 side. Moreover, the structure of the wall part 552 and the flange part 521a becomes a structure which prevents that the lubricant 545 is scattered to the reflective part 51 side also in the air blow process after the assembly.

Such a head-up display device A includes:
In the housing (housing) 1 in which the translucent cover (light emitting part) 9 is formed,
A display unit (display means) 2 for outputting display light L;
A reflecting unit (reflecting means) 5 that includes a reflecting portion 51 that reflects the display light L toward the translucent cover 9 and a pair of rotating shafts 521 that protrude to both ends of the reflecting portion 51;
An actuator (driving means) 6 that adjusts the reflection angle by the reflecting portion 51 by rotating the rotation shaft 521 on one side of the pair of rotation shafts 521;
A ball bearing (rolling bearing) 54 having an inner ring 542 through which the rotating shaft 521 is inserted and an outer ring 541 held on the housing 1 side 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 reflecting portion 51 is enlarged, it can be smoothly rotated using the ball bearing 54. Further, even when the vehicle is running, no noise is generated between the ball bearing 54 and the rotating shaft 521. In addition, since the rotation shaft 521 can be firmly supported, vibrations of the reflecting portion 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 location 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 larger than the diameter D2 of the hole of the inner ring 542 before the assembly. Therefore, by deforming the inner ring 542, gaps between the components in the ball bearing 54 can be reduced, and abnormal noises emitted from the inside of the ball bearing 54 can be prevented.

  Note that the head-up display device A of the present invention has been described by way of example in the configuration of the above-described embodiment, but the present invention is not limited to this, and the gist of the present invention is also in other configurations. It goes without saying that various improvements and display changes can be made without departing from the scope of the invention. For example, in the above-described embodiment, an example using a liquid crystal panel that forms a display image using the irradiation light of the backlight unit 3 has been described as an example. However, laser light is scanned as illumination light. The projector system using DMD (digital mirror device) can also be applied, and by combining the mirror units, the same effects as in the above-described embodiment can be obtained.

  The present invention relates to a head-up display device, for example, suitable as an in-vehicle display device for vehicle information and road information such as turn-by-turn display mounted on a moving body including an automobile, a motorcycle, or an agricultural machine or a construction machine. is there.

A Head-up display device (on-vehicle projection device)
D1 Outer diameter D2 Diameter 1 Housing (housing)
2 Display unit (display means)
3 Backlight unit 4 Flat mirror 5 Reflection unit (reflection means)
51 Reflecting portion 52 Holder 521 Rotating shaft 53 Supporting portion 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 portion 553 Hole portion 554 Window portion 6 Actuator (drive means)
7 Windshield 8 Emission part 9 Translucent cover (emission part)

Claims (2)

In the case 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 to both end sides of the reflecting portion;
Driving means for adjusting a reflection angle by the reflecting portion by rotating the rotation shaft on one side of the pair of rotation shafts;
A rolling bearing having an inner ring through which the rotating shaft is inserted and an outer ring held on the housing side on both sides of the pair of rotating shafts;
With
The on-vehicle projection apparatus, wherein the rotating shaft is press-fitted and assembled to the inner ring of the rolling bearing. In the place where the rotating shaft and the inner ring of the rolling bearing contact,
The in-vehicle projection device according to claim 1, wherein an outer diameter of the rotating shaft is set larger than a diameter of the hole of the inner ring before the assembly.

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