JP2019159074A - Optical device, optical device manufacturing method and moving body - Google Patents

Abstract

To facilitate assembling of a light source device.SOLUTION: In a physically separated first unit or second unit, at least two positioning hole parts, which are shaped into a long hole capable of inserting a positioning pin and have a short diameter almost identical to that of the positioning pin, are provided so that a parallel direction of a light source part and a direction of a long diameter are consistent. Then, each positioning pin is inserted into each positioning hole part respectively, the first unit and second unit are mutually screwed via a stationary part, thereby assembling an optical device. By simply inserting each positioning pin into each positioning hole part and screwing each unit, assembling can be simply conducted.SELECTED DRAWING: Figure 8

Description

  The present invention relates to an optical device, a method for manufacturing the optical device, and a moving body.

  Nowadays, optical devices such as a head-up display device and a projector device are known. This optical device shapes and superimposes light beams of each color emitted from light sources of multiple colors (red, green, blue, etc.) into a thin beam shape using a plurality of optical elements (coupling lenses, prisms, etc.). A color projection image is formed by and projected onto the object.

  For example, in the case of an optical scanning projector disclosed in Patent Document 1 (Japanese Patent Application Laid-Open No. 2009-288520), combined light formed by coaxially combining a plurality of different color lights modulated based on an image signal. Then, it deflects in a two-dimensional direction according to the image signal. Then, the deflection angle of the deflected combined light is enlarged and projected onto the screen by a free-form surface prism having a plurality of optical surfaces of a non-rotation target shape.

  In general, an optical unit provided with an optical element for forming a projected image is precisely positioned in the production process and fixed to the light source unit with an adhesive such as an ultraviolet curable resin or a thermosetting resin. By using an adhesive when fixing the optical unit to the light source unit, it is possible to realize a reduction in production cost and a reduction in the size of the optical device as compared with the case where a leaf spring or a screw is used.

  However, the conventional optical device is difficult to assemble because it is necessary to precisely assemble the optical unit and the light source unit.

  The present invention has been made in view of the above-described problems, and an object thereof is to provide an optical device that enables simple assembly, a method for manufacturing the optical device, and a movable body.

  In order to solve the above-described problems and achieve the object, the present invention includes a first unit and a second unit that are physically separated, a light source unit provided in the first unit, and a second unit. An optical unit that is provided in the unit and forms and emits an irradiation image based on light emitted from the light source unit of the first unit, and at least two positioning units provided in the first unit or the second unit In the state where the hole is positioned by the positioning hole and the positioning pin, the positioning pin inserted in each positioning hole provided on the unit side different from any unit provided with the positioning hole, Each positioning hole has a long hole shape, and the short diameter is substantially the same as the diameter of the positioning pin, and the light source section has a fixing section for fixing the first unit and the second unit to each other. Parallel direction and Wherein the the direction of the diameter is provided on either of the units to match.

  According to the present invention, it is possible to easily assemble an optical device.

Drawing 1 is a mimetic diagram for explaining the projection form of the head up display device of an embodiment. FIG. 2 is a perspective view of an optical device provided in the head-up display device of the embodiment. FIG. 3 is a perspective view of the light source unit with a part cut away so that the light source can be seen. FIG. 4 is a top view of the inner surface of the laser housing that is exposed by removing the cover and the LD substrate from the light source unit. FIG. 5 is an exploded perspective view of the light source unit. FIG. 6 is a diagram illustrating a mounting surface of the light source unit (a bottom view of the light source unit). FIG. 7 is a diagram (a top view of the optical unit) showing the mounting surface of the optical unit. FIG. 8 is a perspective view showing how the optical device is assembled by combining the light source unit and the optical unit.

  Hereinafter, an optical device, a method for manufacturing the optical device, and a moving body will be described based on a head-up display device described as an example.

(Configuration of main parts of moving body)
The head-up display device of the embodiment is provided in a moving body such as a vehicle (automobile), an aircraft, and a ship. Drawing 1 is a mimetic diagram for explaining the projection form of the head up display device of an embodiment. As shown in FIG. 1, the head-up display device 1 includes an optical device 10, a two-dimensional deflection unit 11, a concave mirror 12, a scanned surface element 13, a concave mirror 14, and a reflective surface element 15.

  The optical device 10 includes a light source unit 100 and an optical unit 200 described later, and is a laser light source that irradiates a pixel display beam LC (laser light) for color image display. The pixel display beam LC is a beam of three colors of red (hereinafter referred to as “R”), green (hereinafter referred to as “G”), and blue (hereinafter referred to as “B”). The two-dimensional deflection unit 11 is irradiated with the beam. The light source unit 100 is an example of a first unit, and the optical unit 200 is an example of a second unit. Each optical member provided in the optical unit 200 is an example of an optical unit.

  As an example, as the two-dimensional deflecting unit 11, a so-called MEMS mirror (Micro Electro Mechanical Systems) configured to swing a minute mirror about “two axes orthogonal to each other” as a swing axis is used. Can do. The two-dimensional deflection unit 11 deflects the pixel display beam LC emitted from the optical device 10 in a two-dimensional direction. Note that the two-dimensional deflection unit 11 may be a combination of, for example, two micro mirrors that swing around one axis so that the swing directions are orthogonal to each other.

  The pixel display beam LC deflected in the two-dimensional direction is applied to the concave mirror 12. The concave mirror 12 reflects the incident pixel display beam LC to align the direction of the pixel display beam LC in a certain direction. The pixel display beam LC reflected by the concave mirror 12 is incident on the scanned surface element 13.

  The scanned surface element 13 is a microlens array having a “fine convex lens structure”, for example, and forms a “color two-dimensional image” by being scanned in a two-dimensional direction by an incident pixel display beam LC. Of course, what is displayed at each moment is “only the pixel irradiated with the pixel display beam LC at that moment”. That is, the color two-dimensional image is formed as “a set of pixels displayed at each moment” by scanning in the two-dimensional direction with the pixel display beam LC.

  The concave mirror 14 reflects the light constituting the “color two-dimensional image” formed on the scanned surface element 13. In other words, the scanned surface element 13 and the concave mirror 14 constitute a “virtual image imaging optical system”, and an enlarged virtual image 17 of a color two-dimensional image is formed. A reflective surface element 15 is provided on the front side of the imaging position of the magnified virtual image 17 to reflect the light beam that forms the magnified virtual image 17 to the operator side of the moving body. With this reflected light, the operator visually recognizes the enlarged virtual image 17.

(Configuration of optical device)
FIG. 2 is a perspective view of the optical device 10. As shown in FIG. 2, the optical device 10 is formed by fixing a light source unit 100 shown as an upper unit in FIG. 2 and an optical unit 200 shown as a lower unit with screws. Has been.

  In the light source unit 100, light sources 102a, 102b, and 102c are linearly arranged. The light sources 102a, 102b, and 102c, which are examples of the light source unit, are laser diodes fixed to the LD substrate 104 shown in FIG. 3, and laser light of each color of R (red), G (green), and B (blue), respectively. Is emitted. The coupling lenses 202a, 202b, and 202c collimate the divergent laser beams of the respective colors emitted from the light sources 102a, 102b, and 102c. The divergent laser light of each color, which has been converted into parallel light, is emitted after its beam shape is shaped by passing through the small holes of the aperture 203, respectively.

  The B laser beam LB is reflected by the mirror 204 and is incident on the prism 205b. The G laser beam LG is also incident on the prism 205b. Here, the prism 205b includes a dichroic film 206b that transmits the laser beam LB and reflects the laser beam LG. In other words, the prism 205b has a reflection / transmission surface (dichroic film 206b) that reflects a light beam of a predetermined wavelength and transmits a light beam of another wavelength so that the prism 205b is surrounded by at least four apexes and a bottom surface. The prism is a rectangular parallelepiped provided at, and reflects the laser beam LG, transmits the laser beam LB, and emits it to the prism 205a.

  The R laser beam LR is incident on the prism 205a. The prism 205a has a dichroic film 206a that transmits the laser beams LG and LB and reflects the laser beams LR. That is, the prism 205a has a reflection / transmission surface (dichroic film 206a) that reflects a light beam having a predetermined wavelength and transmits a light beam having another wavelength, so that the prism 205a is surrounded by at least four apexes and a bottom surface. It is a rectangular parallelepiped prism. Therefore, the laser beams of the colors LR, LG, and LB are combined into one beam and emitted from the prism 205a. The light beam emitted from the prism 205a is emitted to the prism 205d as the pixel display beam LC described above.

  The prism 205d transmits 95% of the laser light beams LG, LB, and LR through the ND film 206d (= attenuating film, ND: Neutral Density), and emits the laser light to the two-dimensional deflecting unit 11 shown in FIG. Reflects 5% of the light beams LG, LB, LR. This 5% reflected light is condensed as a monitor beam LM by a condenser lens 207 and irradiated to the light receiving sensor 107 of the light source unit 100 shown in FIG. 6 for monitoring the amount of light of the pixel display beam LC. Based on the received light amount of the light receiving sensor 107, the light amounts of the laser light beams LG, LB, and LR are detected.

  The coupling lenses 202a, 202b, 202c and the prisms 205a, 205b, 205d are fixed to the respective seating surfaces in the prism housing 201 with adhesives. In order to obtain one pixel display beam LC that has been color-synthesized as described above, each optical element needs to be precisely adjusted and fixed.

(Structure of light source unit)
FIG. 3 is a perspective view of the light source unit 100 with a part cut away so that the light sources 102a, 102b, and 102c can be seen. As shown in FIG. 3, in the light source unit 100, light sources 102a, 102b, and 102c, which are laser diodes of the respective colors, are inserted into mounting holes 151a, 152b, and 152c of a laser housing 101 that serves as a base. Fix it. Then, an LD (Laser Diode) substrate 104 is attached so as to cover the light sources 102 a, 102 b, 102 c, and the lead portions of the light sources 102 a, 102 b, 102 c protruding from the through holes provided in the LD substrate 104 are soldered to the LD substrate 104. Attach. Further, a cover 105 is attached so as to cover the LD substrate 104 and fixed with a plurality of screws 106. The light receiving sensor 107 described above is fixed in the light source unit 100.

  The laser housing 101 and the cover 105 are preferably formed of a member such as a metal having a high thermal conductivity for the purpose of cooling the light source and electromagnetic shielding. As an example, the head-up display device 1 of the embodiment forms the laser housing 101 and the cover 105 using an aluminum member. The aluminum member has high thermal conductivity, is easy to process, and has a low material cost. For this reason, the light source unit 100 which has high heat conductivity can be manufactured easily and at low cost by using an aluminum member.

  If priority is given to the cooling effect, the laser housing 101 and the cover 105 may be formed using, for example, a copper member having a higher thermal conductivity. When weight reduction is prioritized, the laser housing 101 and the cover 105 may be formed using a magnesium member that is lighter than the aluminum member.

(Fixed structure of each light source)
Here, FIG. 4 shows a top view of the inner surface of the laser housing 101 exposed by removing the cover 105 and the LD substrate 104 from the light source unit 100 (top view of the laser housing 101). As shown in FIG. 4, the leaf spring 103 that fixes the light sources 102a, 102b, and 102c to the laser housing 101 has a substantially rectangular shape. The plate spring 103 is screwed to the laser housing 101 so as to cover the light sources 102a, 102b, and 102c inserted into the mounting holes 151a, 152b, and 152c of the laser housing 101 from above (to be pressed from above). The

  That is, the plate spring 103 is provided with holes 170a to 170f at positions corresponding to the upper and lower sides of the light sources 102a, 102b, and 102c shown in FIG. 4 when attached to the laser housing 101. The laser housing 101 is provided with screw holes 171a to 171f at positions corresponding to the holes 170a to 170f. The plate spring 103 is fixed to the laser housing 101 by screwing screws into the screw holes 171 a to 171 f of the laser housing 101 through the holes 170 a to 170 f of the plate spring 103.

  The leaf spring 103 has a slightly larger diameter than the diameter of the light sources 102a, 102b, and 102c at a position that faces the light sources 102a, 102b, and 102c when screwed to the laser housing 101. Holes 172a, 172b, and 172c are provided. When the leaf spring 103 is mounted on the laser housing 101, the lead wires of the light sources 102a, 102b, and 102c are inserted through the holes 172a, 172b, and 172c.

  Further, the holes 172a, 172b, and 172c of the leaf spring 103 are provided so as to protrude from the inner peripheral portions of the holes 172a, 172b, and 172c toward the central axis of the holes 172a, 172b, and 172c. Claw portions 173a to 173c, 174a to 174c, and 175a to 175c are provided. For example, in the case of the head-up display device 1 according to the embodiment, the holes 172a, 172b, and 172c are provided with claw portions 173a to 173c, 174a to 174c, and 175a to 175c at intervals of 120 degrees, respectively. Yes.

  The claw portions 173a to 173c, 174a to 174c, and 175a to 175c press the light sources 102a, 102b, and 102c in the direction opposite to the leaf spring 103 when the leaf spring 103 is mounted on the laser housing 101. . In other words, the light sources 102a, 102b, and 102c are pressed at three points by the claw portions 173a to 173c, 174a to 174c, and 175a to 175c, respectively, and fixed to the laser housing 101. Thus, the light sources 102a, 102b, and 102c can be accurately positioned and firmly fixed to the laser housing 101.

  In this example, the three claw portions 173a to 173c, 174a to 174c, and 175a to 175c are provided for the hole portions 172a, 172b, and 172c, respectively, but one or two claw portions may be provided. Alternatively, four or more claw portions may be provided.

(Easy removal structure of light source)
Further, the leaf spring 103 can be easily removed from the laser housing 101 by removing screws screwed into the screw holes 171a to 171f of the laser housing 101 through the holes 170a to 170f of the leaf spring 103. It has become.

  For this reason, even when the bonding of the light source unit 100 and the optical unit 200 fails, each light source 102 a, 102 b, 102 c can be taken out from the laser housing 101 simply by removing the leaf spring 103 from the laser housing 101 of the light source unit 100. . For this reason, it is possible to reuse and effectively utilize resources (parts).

(Shield structure of light source unit)
Next, an exploded perspective view of the light source unit 100 is shown in FIG. As can be seen from FIG. 5, in the case of the light source unit 100 provided in the head-up display device 1 of this embodiment, the outer shape of the LD substrate 104 is the same as the outer shape of the laser housing 101 and the outer shape of the cover 105. They have substantially the same outer shape. The LD substrate 104 is sandwiched between the laser housing 101 and the cover 105 and then fixed with a plurality of screws 106.

  A portion of the LD substrate 104 that comes into contact with the laser housing 101 and the cover 105 is provided with a grounding processing portion 180 that is grounded (GND processing) as indicated by a hatched line in FIG. This grounding process is performed on both the portion in contact with the cover 105 and the portion in contact with the laser housing 101. For this reason, although not appearing in FIG. 5, the LD substrate 104 has a grounding portion 181 at a portion in contact with the laser housing 101.

  The LD substrate 104 is grounded in the form of a so-called body ground via the grounding processing part 180 and the cover 105, and via the grounding processing part 181 and the laser housing 101.

  In the light source unit 100, the LD substrate 104 is sandwiched between the laser housing 101 and the cover 105 as described above, and the laser housing 101 and the cover 105 are fixed with a plurality of screws through the LD substrate 104. For this reason, the LD substrate 104 can be strongly sealed in the light source unit 100. Accordingly, it is possible to strongly prevent inconvenience that radiation noise generated from the LD substrate 104 or the like is radiated out of the light source unit 100.

(Light source unit mounting surface)
Next, FIG. 6 shows a mounting surface of the light source unit 100 (a bottom view of the light source unit 100). The optical unit 200 is attached to the attachment surface of the light source unit 100. As shown in FIG. 6, the light source unit 100 has three screw holes 109 a to 109 c for screwing the optical unit 200 to the light source unit 100 in the laser housing 101. The light source unit 100 (and the laser housing 101) has a triangular shape when roughly viewed from the upper surface side. The three screw holes 109a to 109c are provided at positions corresponding to the triangular corners. As will be described later, the optical unit 200 is screwed to the light source unit 100 through these three screw through holes 109a to 109c.

  Each light source 102a, 102b, 102c is provided in the laser housing 101 so as to be positioned on a straight line passing through the center of the laser housing 101 from the corner corresponding to the apex of the triangular shape as shown in FIG. Yes. Of the three light sources 102a, 102b, 102c, the light source 102c is provided in the vicinity of a screw hole 109a provided at a corner corresponding to the apex of the triangular shape. The light source 102b is provided at a position separated from the light source 102a by a distance P (light source pitch P). The light source 102a is provided at a position separated from the light source 102b by a distance P.

  That is, the three light sources 102a, 102b, and 102c are located on a straight line passing through the center of the laser housing 101 from the corner corresponding to the above-described triangular shape, and generally correspond to the above-described triangular shape. It is provided so as to be at equal intervals P near the screw hole 109a provided at the corner.

  In the light source unit 100, the laser housing 101 is provided with three positioning bosses 108a to 108c that protrude in a direction opposite to the direction of the cover 105 and each have a substantially cylindrical shape. The positioning bosses 108a to 108c are examples of positioning pins. The straight line connecting the light sources 102a, 102b, and 102c is the X axis, and the axis that passes through the light source 102b disposed at the center of the three light sources 102a, 102b, and 102c and is orthogonal to the X axis is the Y axis. The positioning boss 108c is disposed on the Y axis.

  That is, of the three positioning bosses 108a to 108c, the first positioning boss 108a is between the light source 102c and the screw hole 109a provided at the corner corresponding to the apex of the triangular shape. It is provided so as to be located on the X axis. The second positioning boss 108b is provided so as to be close to the screw through hole 109b and the screw through hole 109c and on the above-described X axis. The third positioning boss 108c is provided on the above-described Y axis so as to be adjacent to the light source 102b located at the center among the light sources 102a, 102b, and 102c. In FIG. 6, the positioning boss 108c is illustrated so as to be adjacent to the left side of the light source 102b, but may be provided so as to be adjacent to the right side of the light source 102b.

  Further, the light source unit 100 is provided with a light receiving sensor 107 for monitoring the amount of light of the pixel display beam LC so as to be close to the light source 102a and located on the X axis.

  When the laser housing 101 expands or contracts due to a temperature change, the light sources 102a, 102b, and 102c of the light source unit 100 are displaced. However, in the case of the light source unit 100 having such a configuration, the light sources 102a, 102b, and 102c are between the two positioning bosses 108a and the positioning bosses 108b, and are straight lines connecting the two positioning bosses 108a and the positioning bosses 108b. It is provided on the top (on the X axis). For this reason, in the Y-axis direction, the positional deviation of the three light sources 102a, 102b, and 102c can be prevented. Further, in the X-axis direction, it is possible to prevent the positional deviation of the light source 102b provided on the X-axis in the vicinity of the positioning boss 108c. Further, in the Y-axis direction, the positional shift that occurs in the light sources 102a and 102c can be suppressed to a minimum by the linear expansion corresponding to the light source pitch P of each adjacent light source.

(Optical unit mounting surface)
Next, FIG. 7 shows a mounting surface of the optical unit 200 (a top view of the optical unit 200). The light source unit 100 is attached to this attachment surface. When viewed from the upper surface side, the optical unit 200 is roughly expressed and has an isosceles triangle shape. The prism housing 201 of the optical unit 200 is provided with screw through holes 209a to 209c at positions corresponding to the corners of an isosceles triangle. When the optical unit 200 is mounted on the light source unit 100, the screw through holes 209a to 209c of the optical unit 200 form a series of screw holes together with the screw through holes 109a to 109c of the light source unit 100. By screwing a screw into this screw hole, the optical unit 200 is screwed to the light source unit 100 and the optical device 10 is assembled. The screw through holes 109a to 109c and the screw through holes 209a to 209c are an example of a fixing unit.

  The prism housing 201 of the optical unit 200 is provided with coupling lenses 202a to 202c into which the laser light beams LR, LG, and LB emitted from the light sources 102a, 102b, and 102c of the light source unit 100 are respectively incident. . The coupling lenses 202a to 202c are positioned on the X axis, which is a straight line passing through the center of the prism housing 201, from the screw through hole 209a provided at the corner corresponding to the apex of the isosceles triangle. Is provided. On the X axis, a condensing lens 207 for emitting a monitor beam LM for monitoring the amount of light of the pixel display beam LC is provided in the vicinity of the coupling lens 202a. The coupling lenses 202a to 202c and the condensing lens 207 provided on the X axis are provided close to the screw through hole 209a side at substantially equal intervals.

(Shape and direction of positioning hole)
The prism housing 201 of the optical unit 200 is provided with positioning holes 208a to 208c at positions corresponding to the positioning bosses 108a to 108c of the light source unit 100 described above. Among these, the positioning hole 208a is on the X axis and is provided between the screw-through hole 209a and the coupling lens 202c. The positioning hole 208b is provided at a position close to the screw through hole 209b and the screw through hole 209c on the X axis. The positioning hole 208c is two-dimensionally orthogonal to the X axis, is located on the Y axis that is a straight line passing through the center of the coupling lens 202b, and is provided at a position adjacent to the coupling lens 202b.

  In the example of FIG. 7, the positioning hole 208c is provided adjacent to the right side of the coupling lens 202b, but may be provided adjacent to the left side of the coupling lens 202b.

  Here, the positioning holes 208a to 208c provided in the prism housing 201 are each processed into a long hole shape. Although it is an example, in the case of this embodiment, each positioning hole 208a-208c is each processed into the elliptical shape (long hole part). In addition, the major axis direction of each positioning hole 208a to 208c is provided in the prism housing 201 so as to coincide with the parallel direction of the light sources 102a, 102b, and 102c. In other words, the positioning hole 208a and the positioning hole 208b provided on the X axis are provided in the prism housing 201 so that the major axis coincides with the X axis. The positioning hole 208c provided on the Y axis is provided in the prism housing 201 so that the major axis coincides with the Y axis.

  Furthermore, in other words, of the at least three positioning hole portions 208a to 208c, the two positioning hole portions 208a and 208b are arranged such that the major axis direction coincides with the arrangement direction (X-axis direction) of the coupling lenses 202a to 202c. The remaining positioning hole 208c is provided so that the major axis direction coincides with the direction (Y-axis direction) orthogonally orthogonal to the arrangement direction of the coupling lenses 202a to 202c.

  The positioning bosses 108a to 108c of the light source unit 100 are substantially cylindrical, and the positioning holes 208a to 208c of the optical unit 200 are each elliptical (long hole). The diameters of the positioning bosses 108a to 108c are substantially the same as the short diameters of the positioning holes 208a to 208c. When assembling the optical device 10, the positioning bosses 108 a to 108 c of the light source unit 100 are inserted into the positioning holes 208 a to 208 c of the optical unit 200, respectively, so that both are combined.

  The positioning hole 208c provided with the major axis direction aligned with the Y-axis direction may be provided close to the coupling lens 202a or (and) the coupling lens 202c. Alternatively, three positioning hole portions 208c provided with the major axis direction aligned with the Y-axis direction may be provided close to the coupling lenses 202a to 202c.

  By positioning the positioning holes 208a to 208c of the optical unit 200 into an elliptical shape, the positioning bosses 108a to 108c are positioned in the positioning holes 208a to 208c even if there is some variation in the component accuracy of the light source unit 100 and the optical unit 200. The probability of fitting to can be increased. For this reason, the assembly of the optical device 10 can be facilitated and the manufacturing yield can be improved.

  The optical device 10 is assembled through three fitting points by the three positioning bosses 108 a to 108 c of the light source unit 100 and the three positioning holes 208 a to 208 c of the optical unit 200. When the number of fitting points is increased, for example, 5 points or 6 points, the component accuracy of the light source unit 100 and the optical unit 200 is required, resulting in an inconvenience that the difficulty in assembling the optical device 10 increases.

  However, the configuration of assembling the optical device 10 through three fitting points as in the optical device 10 can reduce the requirement of component accuracy required for the light source unit 100 and the optical unit 200. Also, the assembly of the optical device 10 can be facilitated.

  Further, the temperature change causes expansion or contraction (changes) in the laser housing 101 and the prism housing 201, which causes positional deviation of the light source unit 100 and the optical unit 200. However, among the fluctuations that occur in the laser housing 101 and the prism housing 201, the fluctuation in the X-axis direction shown in FIG. 7 occurs in the positioning hole portions 208a and 208b whose major axis direction coincides with the X-axis direction in the X-axis direction. As the positioning bosses 108a and 108b move along, they are absorbed by the positioning holes 208a and 208b.

  Of the fluctuations occurring in the laser housing 101 and the prism housing 201, the fluctuation in the Y-axis direction shown in FIG. 7 is along the Y-axis direction in the positioning hole 208c whose major axis direction coincides with the Y-axis direction. The positioning boss 108c moves and is absorbed by the positioning hole 208c. For this reason, by making the major axis direction of the positioning holes 208a to 208c coincide with the X-axis direction or the Y-axis direction, it is possible to prevent the positional deviation of the light source unit 100 and the optical unit 200, and to maintain the adjusted optical path.

  In this example, the positioning bosses 108a to 108c are provided on the light source unit 100 side, and the positioning holes 208a to 208c are provided on the optical unit 200 side. However, the positioning hole portions 208a to 208c may be provided on the light source unit 100 side, and the positioning bosses 108a to 108c may be provided on the optical unit 200 side. When the positioning holes 208a to 208c are provided on the light source unit 100 side, the positioning holes 208a to 208c are provided at the positions where the positioning bosses 108a to 108c shown in FIG. 6 are provided. When the positioning bosses 108a to 108c are provided on the optical unit 200 side, the positioning bosses 108a to 108c are provided at the positions where the positioning holes 208a to 208c shown in FIG. 7 are provided. In either case, the same effect as described above can be obtained.

  In addition, although three positioning bosses 108a to 108c and three positioning holes 208a to 208c are provided, two or four or more positioning bosses may be provided.

  Further, in this example, the positioning holes 208a to 208c are each processed into an elliptical shape as an example of the long hole shape, but in addition, for example, the longitudinal direction and the short direction are set like a rectangular shape. Any shape may be used as long as it has a shape.

  Similarly, the positioning bosses 108a to 108c are each substantially cylindrical, but any other shape that can be inserted into the positioning holes 208a to 208c, such as a rectangular parallelepiped shape, can be used. Shape may be sufficient.

(Light source unit and optical unit formed of members having the same linear expansion coefficient)
Next, in the head-up display device 1 according to the embodiment, both the light source unit 100 and the optical unit 200 are formed of members having substantially the same linear expansion coefficient. In addition, you may form the light source unit 100 whole and the optical unit 200 whole with the member of a substantially equivalent linear expansion coefficient, respectively. Alternatively, the components having an effect on the positional deviation, such as forming the light source unit 100 laser housing 101 and the prism housing 201 of the optical unit 200 with members having substantially the same linear expansion coefficient, have substantially the same linear expansion coefficient. You may form with the member which has.

For example, the linear expansion coefficient is “11.7 (10 ⁻⁶ / K)” for iron, “16.6 (10 ⁻⁶ / K)” for copper, and “23.0 (10 ⁻⁶ / K)” for aluminum. The aluminum die casting (ADC12) has a specific value corresponding to the member such as “21.0 (10 ⁻⁶ / K)”, the aluminum alloy (A5052) “23.8 (10 ⁻⁶ / K)”, and the like.

In the case of the head-up display device 1 according to the embodiment, both the light source unit 100 and the optical unit 200 are formed of members having a linear expansion coefficient difference of “3 × 10 ⁻⁶ / K or less”. Specifically, both the laser housing 101 and the prism housing 201 are made of an aluminum alloy. Thereby, the difference in linear expansion coefficient between the laser housing 101 and the prism housing 201 can be set to “3 × 10 ⁻⁶ / K or less”, and the amount of positional deviation between the light source unit 100 and the optical unit 200 is within an allowable range. be able to. Therefore, in combination with the operation of the positioning holes 208a to 208c described above, it is possible to prevent the displacement of the light source unit 100 and the optical unit 200 more strongly.

(Assembling process of optical device)
Next, FIG. 8 is a perspective view showing how the optical device 10 is assembled by combining the light source unit 100 and the optical unit 200. As shown in FIG. 8, the light source unit 100 and the optical unit 200 include three positioning bosses 108a to 108c provided on the light source unit 100 side and three positioning holes 208a to 208c provided on the optical unit 200 side. To be inserted and fitted. As described above, since the three positioning holes 208a to 208c provided on the optical unit 200 side have an elliptical shape, they are provided on the light source unit 100 side with respect to the positioning holes 208a to 208c. The positioning bosses 108a to 108c can be easily inserted, and the light source unit 100 and the optical unit 200 can be easily combined.

  Next, after the light source unit 100 and the optical unit 200 are combined in this way, the optical axis, the optical path, and the like are adjusted, and the three fastening screws 31 are connected to the screw through holes 109a and 209a, the screw through holes. The optical unit 200 is fastened to the light source unit 100 by being screwed into 109b and 209b and screw through holes 109c and 209c. Thereby, the optical apparatus 10 is assembled. The assembled optical device 10 is subjected to an optical property inspection in an inspection process, and if it passes, it is incorporated into the head-up display device 1.

  On the other hand, if the optical characteristic inspection fails, the adhesion failure of the coupling lens 202 or the prism 205 is suspected. In this case, the optical device 10 is disassembled into the light source unit 100 and the optical unit 200 by removing the fastening screw 31, and the relatively inexpensive optical unit 200 is disposed of. The light source unit 100 provided with the expensive light sources 102a, 102b, and 102c is reused.

  In the case of the head-up display device 1 according to the embodiment, an adhesive is not used when the light source unit 100 and the optical unit 200 are combined, and the light source unit 100 and the optical unit 200 remain clean just by removing the fastening screw 31. Can be separated. For this reason, even if the optical property inspection fails, the light source unit 100 can be reused, and the disadvantage that the expensive light sources 102a, 102b, 102c in the optical unit 100 are discarded can be prevented. ) Can be reused and effectively utilized.

  Moreover, the light source unit 100 can be disassembled by removing the screw 106 of the light source unit 100 shown in FIG. Then, the plate spring 103 can be removed from the laser housing 101 simply by pulling up the plate spring 103 in a direction opposite to that at the time of mounting (a direction opposite to the light sources 102a, 102b, 102c). Thereby, each light source 102a, 102b, 102c pressed by the leaf | plate spring 103 can be taken out. Therefore, even when the optical characteristic inspection is rejected and the light source unit 100 is discarded, the expensive light sources 102a, 102b, and 102c can be taken out and discarded, and resources (parts) can be reused and effectively used. It can be.

(Effect of embodiment)
As is apparent from the above description, the head-up display device 1 of the embodiment can obtain the following effects.

  1. By employing the positioning holes 208a and 208b which are at least two long holes, the assembly of the optical device 10 can be facilitated.

  2. Further, by making the positioning hole portions 208a to 208c of the optical unit 200 into an elongated hole shape, for example, an elliptical shape, the positioning bosses 108a to 108a are arranged even if there are some variations in the component accuracy of the light source unit 100 and the optical unit 200. The probability that 108c fits into the positioning holes 208a to 208c can be increased. For this reason, the assembly of the optical device 10 can be facilitated and the manufacturing yield can be improved.

  By adopting a configuration in which the optical device 10 is assembled through the three fitting points, it is possible to reduce the requirement of component accuracy required for the light source unit 100 and the optical unit 200, and the optical device 10. Assembling can also be facilitated.

  4). Of the fluctuations such as expansion or contraction in the laser housing 101 and the prism housing 201 due to the temperature change, the fluctuations in the X-axis direction shown in FIG. Can be absorbed by the positioning holes 208a and 208b by the positioning bosses 108a and 108b moving along the X-axis direction. Of the fluctuations occurring in the laser housing 101 and the prism housing 201, the fluctuation in the Y-axis direction shown in FIG. 7 is along the Y-axis direction in the positioning hole 208c whose major axis direction coincides with the Y-axis direction. When the positioning boss 108c moves, it is absorbed by the positioning hole 208c. Thereby, the position shift of the light source unit 100 and the optical unit 200 can be prevented, and the adjusted optical path can be maintained.

  5. Both the laser housing 101 and the prism housing 201 are formed of members having a linear expansion coefficient difference of “3 × 10 −6 / K or less”. Thereby, the positional deviation amount of the light source unit 100 and the optical unit 200 can be within an allowable range. Therefore, in combination with the operation of the positioning holes 208a to 208c described above, it is possible to prevent the displacement of the light source unit 100 and the optical unit 200 more strongly.

(Modification)
Finally, the above-described embodiment has been presented as an example, and is not intended to limit the scope of the present invention. For example, the above-described embodiment is an example in which the present invention is applied to a head-up display device, but may be applied to a so-called projector device. In this case, the same effect as described above can be obtained.

  In the above description of the embodiment, the optical device 10 is divided into the light source unit 100 and the optical unit 200. However, the optical device 10 may be assembled by combining three or more units separated so as to be physically different units. Even in this case, the same effect as described above can be obtained.

  The positioning holes 208a to 208c have been described as penetrating holes. However, the positioning holes 208a to 208c have a concave shape (groove shape) that does not penetrate, and the positioning bosses 108a to 108c are fitted to the light source unit 100 and the optical unit, respectively. The unit 200 may be positioned.

  The above-described novel embodiments can be implemented in various other forms, and various omissions, replacements, and changes can be made without departing from the spirit of the invention. Further, the embodiments and the modifications of the embodiments are included in the scope and gist of the invention, and are included in the invention described in the claims and the equivalent scope thereof.

DESCRIPTION OF SYMBOLS 1 Head up display apparatus 10 Optical apparatus 31 Fastening screw 100 Light source unit 101 Laser housing 102a Red light source 102b Green light source 102c Blue light source 103 Leaf spring 104 LD board | substrate 105 Cover 106 Screw 107 Light receiving sensor 108a Positioning boss 108b Positioning boss 108c Positioning Boss 109a Screw through hole 109b Screw through hole 109c Screw through hole 180 LD substrate grounding portion 181 LD substrate grounding portion 200 Optical unit 201 Prism housing 202a Coupling lens 202b Coupling lens 202c Coupling lens 207 Collection Optical lens 208a Positioning hole 208b Positioning hole 208c Positioning hole 209a Screw through hole 209b Screw through hole 20 9c Screw hole

JP 2009-288520 A

Claims (9)

A first unit and a second unit physically separated;
A light source provided in the first unit;
An optical unit that is provided in the second unit and forms and emits an irradiation image based on the light emitted from the light source unit of the first unit;
At least two positioning holes provided in the first unit or the second unit;
Among the first unit or the second unit, a plurality of positioning pins that are provided on the unit side different from the unit provided with the positioning hole, and are respectively inserted into the positioning holes,
A fixing portion for fixing the first unit and the second unit to each other in a state of being positioned by the positioning hole and the positioning pin;
The positioning hole has a long hole shape, a short diameter is substantially the same as the diameter of the positioning pin, and the first unit or the first unit or the light source An optical device provided in the second unit. The optical device according to claim 1, wherein the first unit and the second unit are combined by being screwed together via the fixing portion. The first unit and the second unit are formed of members having a difference in linear expansion coefficient between the first unit and the second unit of “3 × 10 ⁻⁶ / K or less”. The optical device according to claim 1 or 2. The first unit is:
A storage section for storing the light source;
A control board for lighting driving control of the light source;
A cover that covers the storage portion,
The control board has a size and a shape in which an outer peripheral portion coincides with an outer peripheral portion of the storage portion and the cover, and a grounding process is applied to a portion in contact with the storage portion and the cover, The optical device according to any one of claims 1 to 3, wherein the optical device is fixed together with the storage portion and the cover by a plurality of screws in a form sandwiched between the storage portion and the cover. The optical apparatus according to claim 4, wherein the light source provided in the storage unit is pressed and fixed by a leaf spring fixed to the storage unit. The first unit or the second unit is provided with first to third positioning hole portions having a long hole shape into which the positioning pin is inserted, and the first and second positioning holes are provided. Is provided in the first unit or the second unit so that the first direction, which is the parallel direction of the light source units, coincides with the direction of the long diameter, and the third positioning hole has a long diameter The first and second positioning holes are provided so that the first direction coincides with a second direction that is two-dimensionally orthogonal to the first direction and is adjacent to the light source unit or the optical unit. The optical device according to any one of claims 1 to 5, wherein the optical device is provided in a unit. A plurality of the light source parts are provided, and the third positioning hole part is adjacent to the light source part located in the center among the plurality of light source parts, and the first and second positioning hole parts are provided. The optical device according to claim 6, wherein the optical device is provided in a provided unit. A first unit and a second unit physically separated;
A light source provided in the first unit;
An optical unit that is provided in the second unit and forms and emits an irradiation image based on the light emitted from the light source unit of the first unit;
At least two positioning holes provided in the first unit or the second unit;
Among the first unit and the second unit, a plurality of positioning pins are provided on the unit side different from the unit on which the positioning hole is provided, and are respectively inserted into the positioning holes. An optical device manufacturing method comprising:
The positioning hole portion has a long hole shape into which the positioning pin can be inserted, and the short diameter is substantially the same as the diameter of the positioning pin, and the parallel direction of the light source portions coincides with the long diameter direction. So as to be provided in the first unit or the second unit,
By inserting the positioning pins into the positioning holes and screwing them together through fixing portions provided in the first and second units, the first unit and the second unit are A method for manufacturing an optical device, wherein the optical device is fixed integrally.   A moving body comprising the optical device according to any one of claims 1 to 7.