WO2022045048A1 - Image projection device - Google Patents

Image projection device Download PDF

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Publication number
WO2022045048A1
WO2022045048A1 PCT/JP2021/030743 JP2021030743W WO2022045048A1 WO 2022045048 A1 WO2022045048 A1 WO 2022045048A1 JP 2021030743 W JP2021030743 W JP 2021030743W WO 2022045048 A1 WO2022045048 A1 WO 2022045048A1
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WO
WIPO (PCT)
Prior art keywords
control board
image
projection device
housing
image projection
Prior art date
Application number
PCT/JP2021/030743
Other languages
French (fr)
Japanese (ja)
Inventor
遥介 中山
Original Assignee
株式会社小糸製作所
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 株式会社小糸製作所 filed Critical 株式会社小糸製作所
Publication of WO2022045048A1 publication Critical patent/WO2022045048A1/en

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60K—ARRANGEMENT OR MOUNTING OF PROPULSION UNITS OR OF TRANSMISSIONS IN VEHICLES; ARRANGEMENT OR MOUNTING OF PLURAL DIVERSE PRIME-MOVERS IN VEHICLES; AUXILIARY DRIVES FOR VEHICLES; INSTRUMENTATION OR DASHBOARDS FOR VEHICLES; ARRANGEMENTS IN CONNECTION WITH COOLING, AIR INTAKE, GAS EXHAUST OR FUEL SUPPLY OF PROPULSION UNITS IN VEHICLES
    • B60K35/00—Arrangement of adaptations of instruments
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
    • G02B27/01—Head-up displays
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
    • G03B21/00—Projectors or projection-type viewers; Accessories therefor
    • G03B21/14—Details
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N5/00—Details of television systems
    • H04N5/66—Transforming electric information into light information

Definitions

  • the present invention relates to an image projection device, and particularly to an image projection device that displays an image to a driver or the like in a vehicle.
  • the conventional HUD device described in Patent Document 1 has a PGU (Picture Generation Unit), a flat plate mirror, and a concave mirror attached to a housing.
  • PGU Picture Generation Unit
  • an image is displayed on a liquid crystal display in the PGU, the image is irradiated with the light emitted from the light source, reflected multiple times by a flat mirror and a magnifying mirror, and then reflected by the windshield of the vehicle. The image is visually recognized by the passenger.
  • the image emitted from the PGU is repeatedly reflected by the flat plate mirror and the magnifying mirror to secure the optical path length and increase the size of the projected image.
  • a lighting board equipped with an LED (Light Emitting Diode), a liquid crystal panel, a lens, a control board equipped with a drive circuit, and the like are housed in the PGU housing. If each of these parts is fixed with a fastening member such as a screw or a bolt, the number of parts increases and the assembly process becomes complicated. In addition, the cables for ensuring the electrical connection of each part are shortened as much as possible in order to reduce the weight and space, and it is difficult to handle during connection work and fixing work, which reduces workability. There was a problem.
  • the present invention has been made in view of the above-mentioned conventional problems, and an object of the present invention is to provide an image projection device capable of reducing the number of parts and improving the efficiency of assembly work.
  • the image projection device of the present invention has an image forming unit that irradiates an image according to an image signal, a control board on which a control unit that drives and controls the image forming unit is mounted, and one end thereof.
  • the control board has an electrical connection that is electrically connected to the image forming portion and the other end of which is electrically connected to the control board, and the control board has a surface opposite to the surface facing the image forming portion.
  • a connector portion is mounted on a certain back surface side, and the other end of the electrical connection portion is connected to the connector portion.
  • the electrical connection portion can be inserted into the connector portion and connected after positioning the control board. It is possible to reduce the number of parts and improve the efficiency of assembly work.
  • the image forming portion includes a transmissive liquid crystal panel and a lighting substrate arranged on the back side of the transmissive liquid crystal panel, and the electrical connection portion is the transmissive liquid crystal panel.
  • a flexible cable for electrically connecting the control board and a wiring cable for electrically connecting the lighting board and the control board are provided.
  • the connector portion is an insertion type connector, and the other end of the electrical connection portion is inserted along the in-plane direction of the control board.
  • control board is formed with a notch portion in which a part of the peripheral edge portion is cut out, and the electrical connection portion is formed from the image forming portion side via the notch portion. It is pulled out to the back surface side.
  • the image forming portion and the PGU housing for accommodating the control board are provided, and the image forming portion and the control board are collectively fixed to the PGU housing by a fastening member. There is.
  • the PGU housing includes a front housing arranged in the image irradiation direction of the image forming portion and a rear housing arranged on the back surface side of the control board, and the back surface of the control board is provided.
  • An external connector electrically connected to the outside is mounted on the side, an opening is formed in the rear housing at a position corresponding to the external connector, and the tip of the external connector is formed in the opening. It has been inserted.
  • a flat plate mirror portion that reflects light emitted from the image forming portion
  • the flat plate mirror portion includes a slide guide formed in the housing and a wall surface of the housing. And, it is positioned and held by the protrusion formed on the housing.
  • the slide guides are provided at both ends of the flat plate mirror portion in the horizontal direction, and the protrusions are provided at both ends of the flat plate mirror portion in the vertical direction.
  • the present invention can provide an image projection device capable of reducing the number of parts and improving the efficiency of assembly work.
  • FIG. 1 is an exploded perspective view showing an outline of the image projection device 100 according to the present embodiment.
  • the image projection device 100 includes a housing 10, a PGU 20, a flat plate mirror unit 30, a magnifying mirror unit 40, a top plate unit 50, and a translucent cover 60.
  • the housing 10 is a member that constitutes the outer shape of the image projection device 100, and has a container shape with an open upper surface.
  • the PGU 20 is externally attached to the back side of the housing 10 (to the right in FIG. 1).
  • a flat mirror portion 30 and a magnifying mirror portion 40 are housed and held inside the housing 10.
  • a top plate portion 50 is attached to the open upper portion of the housing 10, and the inside of the housing 10 is covered with the top plate portion 50.
  • the material constituting the housing 10 is not limited, and can be made of a metal or resin used inside a normal vehicle.
  • the PGU 20 is a unit that irradiates the inside of the housing 10 with light including an image based on an electric power supplied from the outside and a control signal.
  • An opening (not shown) is formed corresponding to the PGU 20 mounting position of the housing 10, and the light emitted by the PGU 20 is emitted from the opening to the inside of the housing 10. The structure of PGU20 will be described later.
  • the flat plate mirror portion 30 is a flat plate-shaped member having a reflecting mirror formed on one surface, and is held inside the housing 10 in front of the housing 10 (to the left in FIG. 1).
  • the mounting position of the flat plate mirror portion 30 is on the optical path of the light irradiated by the PGU 20, and is arranged so as to be inclined at a predetermined angle with respect to the optical axis of the light from the PGU 20. Therefore, the light emitted by the PGU 20 is reflected after being incident on the flat plate mirror portion 30 and travels toward the back surface of the housing 10.
  • the magnifying mirror portion 40 is a member having a curved surface shape in which a reflecting mirror is formed on one surface, and is held inside the housing 10 behind the housing 10.
  • the mounting position of the magnifying mirror portion 40 is on the optical path of the light reflected by the flat plate mirror portion 30, and is arranged so as to be inclined at a predetermined angle with respect to the optical axis of the light from the flat plate mirror portion 30. Therefore, the light reflected by the flat plate mirror unit 30 is reflected again after being incident on the magnifying mirror unit 40, and travels in the direction of the translucent cover 60.
  • FIG. 1 shows a concave mirror curved in the left-right direction as the curved surface shape of the magnifying mirror portion 40, but any shape may be used as long as it is suitable for optical design for projecting an image.
  • the top plate portion 50 is a lid-shaped member arranged so as to cover the opening portion opened at the upper part of the housing 10, and the opening portion is partially formed.
  • the structure, shape, and material of the top plate portion 50 are not limited, but it is preferable that the top plate portion 50 has an airtightness to the extent that dust or the like does not enter the inside of the housing 10. Further, a translucent cover 60 is attached to the opening portion.
  • the translucent cover 60 is a plate-shaped member made of a material that transmits visible light, and is arranged so as to close the opening portion formed in the top plate portion 50.
  • the mounting position of the translucent cover 60 is on the optical path of the light reflected by the magnifying mirror unit 40, and the light from the magnifying mirror unit 40 is transmitted to irradiate the outside of the image projection device 100. Further, the translucent cover 60 is located directly under the windshield of the vehicle, and the light transmitted through the translucent cover 60 is incident on the windshield and reflected.
  • the image projection device 100 of the present embodiment is mounted directly under the windshield (not shown) on the indoor side of the vehicle, and an image is projected onto the windshield.
  • the PGU 20 irradiates light to project an image, and the light of the image is reflected by the flat plate mirror unit 30 and the magnifying mirror unit 40 in the housing 10.
  • the light of the image reflected by the magnifying mirror unit 40 is irradiated to the windshield (not shown) of the vehicle through the translucent cover 60 and reflected, and the image is projected toward the passenger of the vehicle.
  • the passenger visually recognizes the image by the light incident on the viewpoint.
  • FIG. 2 is an exploded perspective view showing an outline of the PGU 20 of the image projection device 100.
  • the PGU 20 includes a front housing 21, a transmissive liquid crystal panel 22, a lens unit 23, a spacer unit 24, a lighting substrate 25, a control substrate 26, and a rear housing 27.
  • the front housing 21 is a member that constitutes a part of the outer shape of the PGU 20, and is arranged in the image irradiation direction of the PGU 20.
  • the front housing 21 is partially provided with an opening, and the opening is formed at a position corresponding to the opening provided on the back side of the housing 10. The light emitted from the image forming portion, which will be described later, is emitted from the opening formed in the front housing 21 into the housing 10 through the opening of the housing 10.
  • the transmissive liquid crystal panel 22 is a liquid crystal display element that forms an image based on the electric power supplied from the control substrate 26 and an image signal, and is irradiated from the back side by controlling the orientation of the liquid crystal molecules for each pixel. Controls the transmission and non-transmission of light.
  • the transmissive liquid crystal panel 22 is positioned and fixed to the back side of the front housing 21, and the light transmitted through the transmissive liquid crystal panel 22 is radiated forward through the opening of the front housing 21.
  • the lens unit 23 is an optical member made of a translucent material, and is a member that adjusts the spread angle of the light emitted by the lighting substrate 25.
  • a plurality of convex lenses are formed on a flat plate-shaped member, and a plurality of support columns are formed.
  • the lens unit 23 is arranged on the back surface side of the transmissive liquid crystal panel 22, and a plurality of support columns abut on the back surface of the transmissive liquid crystal panel 22 to secure a distance between the convex lens and the transmissive liquid crystal panel 22.
  • the spacer portion 24 is arranged between the lens portion 23 and the lighting substrate 25, and is a member for determining a relative position between the two and ensuring a distance between them.
  • the spacer portion 24 has a substantially plate-like shape, and a plurality of openings are formed at positions corresponding to the convex lens of the lens portion 23.
  • the material constituting the spacer portion 24 is not limited, but it is preferable to use a light-shielding resin material in order to limit the region where the light emitted from the lighting substrate 25 is incident on the lens portion 23 to the opening portion.
  • the lighting board 25 is a member in which a plurality of LEDs are mounted on a board on which wiring is formed, and the LEDs are turned on to irradiate light forward based on the electric power and the control signal supplied from the control board 26. ..
  • the arrangement of the LEDs mounted on the lighting substrate 25 corresponds to the convex lens of the lens portion 23 and the opening of the spacer portion 24.
  • the transmissive liquid crystal panel 22, the lens unit 23, the spacer unit 24, and the lighting substrate 25 constitute the image forming unit in the present invention.
  • the LED of the lighting board 25 emits light based on the electric power and the control signal from the control board 26, and the light of the LED is incident on the convex lens of the lens section 23 through the opening of the spacer section 24.
  • the transmissive liquid crystal panel 22 displays an image based on the power from the control board 26 and the image signal, and the light incident on the lens unit 23 is adjusted in the spreading angle to be transmitted through the transmissive liquid crystal panel 22 and displayed. The image is projected forward from the opening of the front housing 21.
  • the control board 26 is a member in which a wiring pattern is formed on the board and a plurality of electronic components are mounted to form a control circuit (control unit). Power and signals are supplied from the outside of the image projection device 100 to the control board 26, and predetermined information processing is executed by the control circuit configured on the board, and the transmissive liquid crystal panel 22 and the transmissive liquid crystal panel 22 which are image forming units are executed. Electric power, an image signal, and a control signal are transmitted to the lighting substrate 25 to drive and control the image forming unit.
  • the rear housing 27 is a member that constitutes a part of the outer shape of the PGU 20, and is arranged on the back surface side (rear surface side) of the control board 26.
  • the rear housing 27 is fitted to the front housing 21 to form one container, and the front housing 21 and the rear housing 27 correspond to the PGU housing in the present invention.
  • the image forming unit and the control board 26 described above are housed inside the PGU housing including the front housing 21 and the rear housing 27.
  • FIG. 3 is an exploded perspective view showing the assembly work of the PGU 20.
  • a state in which the transmissive liquid crystal panel 22, the lens portion 23, the spacer portion 24, and the lighting substrate 25 are housed in the front housing 21 is shown.
  • the flexible cable 22a is led out from the transmissive liquid crystal panel 22 to the rear, and the wiring cable 25b to which the connector portion 25a is attached to the tip is led out from the back surface of the lighting board 25.
  • the front housing 21 is formed with a fixing portion 21a and a positioning pin 21b.
  • the flexible cable 22a is a flexible conductive cable in which a plurality of wirings are sealed from both upper and lower sides with resin layers, and one end side thereof is electrically connected to each wiring pattern of the transmissive liquid crystal panel 22. It is an electrical connection portion for supplying electric power and an image signal from the outside to the transmissive liquid crystal panel 22. The other end of the flexible cable 22a is inserted into the connector portion 26c described later and electrically connected to the connector portion 26c.
  • the connector portion 25a is a male type connector attached to the tip of the wiring cable 25b, and is inserted into the connector portion 26b described later and electrically connected to the connector portion 26b.
  • the wiring cable 25b is an electrical connection portion in which a plurality of conductive materials are bundled, and one end side is soldered to a wiring pattern on the lighting board 25 on the back side of the lighting board 25 to illuminate power and control signals from the outside. It is an electric connection part for supplying to the substrate 25.
  • a connector portion 25a is attached to the other end side of the wiring cable 25b.
  • the fixing portion 21a is a screw hole for fastening the fastening member 28 described later, and is formed at a position corresponding to the fastening hole 27b of the rear housing 27.
  • the positioning pin 21b is a portion for positioning the control board 26 in the front housing 21, and has a pin shape protruding rearward.
  • a notch 26a and a through hole 26e are formed in the control board 26, and the connector portions 26b and 26c and the external connector 26d are mounted on the back surface.
  • the cutout portion 26a is a portion of the peripheral portion of the control board 26 having a partially cutout shape, and the cutout portion 26a is formed, so that the control board 26 lacks a rectangular part. It has a U-shape.
  • the size of the notch 26a is not limited, but as will be described later, since the flexible cable 22a and the wiring cable 25b are passed through the gap between the PGU housing formed by the notch 26a, a size larger than the thickness of both may be cut out. preferable. Further, even if the connector portion 25a is attached to the tip of the wiring cable 25b, the size is preferably such that the connector portion 25a can be passed through the gap between the notch portion 26a and the PGU housing.
  • the connector portions 26b and 26c are female connectors mounted on the back surface side of the control board 26, and are electrically connected to the wiring pattern on the control board 26.
  • the shape of the connector portion 26b is such that the connector portion 25a attached to the tip of the wiring cable 25b fits into the connector portion 26b.
  • By inserting the connector portion 25a into the connector portion 26b an electrical connection is secured between the control board 26 and the lighting board 25, and power and a control signal are transmitted between the control board 26 and the lighting board 25. ..
  • the shape of the connector portion 26c is such that the tip of the flexible cable 22a fits into the connector portion 26c.
  • By inserting the flexible cable 22a into the connector portion 26c an electrical connection is secured between the control board 26 and the transmissive liquid crystal panel 22, and power and image signals are secured between the control board 26 and the transmissive liquid crystal panel 22. Is transmitted.
  • the connector portions 26b and 26c are insertion type connectors, and their insertion openings are arranged so as to face the notch portion 26a direction. Therefore, the flexible cable 22a and the wiring cable 25b pulled out to the back surface side of the control board 26 through the notch 26a are electrically connected by inserting the tip or the connector portion 25a along the in-plane direction of the control board 26. Connection can be made.
  • the back surface side of the control board 26 is a surface of the control board 26 opposite to the surface (front surface) facing the image forming portion.
  • the external connector 26d is a female connector mounted on the back surface side of the control board 26, and is electrically connected to the wiring pattern on the control board 26.
  • the external connector 26d is an insertion type connector, and power and signals are supplied to the control board 26 from the outside by inserting the connector of the external cable from the outside of the PGU 20 in a substantially vertical direction on the surface of the control board 26.
  • the through hole 26e is a hole formed at a position corresponding to the fixing portion 21a, and a fastening member 28 described later is inserted into the through hole 26e.
  • an opening 27a is formed at a position corresponding to the external connector 26d, and a fastening hole 27b is formed at a position corresponding to the fixing portion 21a and the through hole 26e.
  • the opening 27a is an opening for inserting the tip of the external connector 26d to expose the external connector 26d from the back surface of the PGU 20.
  • the fastening hole 27b is a member for inserting a fastening member 28 such as a screw to collectively fix the image forming portion and the control substrate 26 to the PGU housing.
  • FIG. 4 is a schematic cross-sectional view showing the positional relationship of each part inside the PGU 20.
  • a plurality of LEDs 25c are mounted on the front surface of the lighting substrate 25.
  • the spacer portion 24 and the rear housing 27 are not shown for the sake of brevity.
  • the flexible cable 22a and the wiring cable 25b are located on the back surface side of the control board 26 via the notch 26a, respectively. Is pulled out to. This is because the notch 26a is formed in the control board 26, so that a gap of the notch 26a is secured between the front housing 21 and the control board 26.
  • the control board 26 is attached to the front housing 21.
  • the flexible cable 22a and the wiring cable 25b can be pulled out from the mounting and notch 26a to the back surface side. Further, the tip of the flexible cable 22a pulled out from the notch 26a to the back surface side and the connector portion 25a of the wiring cable 25b are inserted into and fitted into the connector portions 26c and 26b, respectively, by simply moving them in the in-plane direction of the control board 26. It can be made to be easy to assemble. At this time, the lengths of the flexible cable 22a and the wiring cable 25b may be secured up to the position where the control board 26 is housed in the front housing 21, and the electrical connection portion is shortened to reduce the weight and space. be able to.
  • the control board 26 is attached, and the flexible cable 22a and the wiring cable 25b are pulled out to the back surface side via the notch 26a and connected to the connector portions 26c and 26b.
  • This procedure facilitates cable routing and improves work efficiency.
  • the flexible cable 22a and the wiring cable 25b are connected after the image forming portion is attached, it is possible to suppress the occurrence of problems such as loosening of the connection and change in the relative positional relationship.
  • FIG. 5 is a schematic perspective view showing an electrical connection inside the PGU 20.
  • the front housing 21 and the rear housing 27 are not shown.
  • the notch 26a is formed below the control board 26, the flexible cable 22a, the wiring cable 25b, and the connector 25a are pulled out from the notch 26a to the back surface side. Further, the tip of the flexible cable 22a and the connector portion 25a are inserted into the connector portions 26c and 26b upward from the notch portion 26a, respectively.
  • the connector portions 26c and 26b are insertion type connectors, and the insertion direction is along the in-plane direction of the control board 26. Further, the connector portions 26c and 26b are arranged adjacent to the notch portion 26a, and the insertion port faces the notch portion 26a. As a result, the tip of the flexible cable 22a pulled out to the back surface side of the control board 26 and the connector portion 25a can be easily inserted into the connector portions 26c and 26b to secure the connection, and the flexible cable 22a and the wiring cable can be secured.
  • the length of 25b can be minimized, the weight can be reduced, the space can be saved, and the work efficiency can be improved.
  • FIG. 6 is a schematic cross-sectional view showing an assembled state of the PGU 20.
  • the flexible cable 22a, the wiring cable 25b, and the connector portion 25a are not shown.
  • an opening 21c is formed on the front surface of the front housing 21, and the transmissive liquid crystal panel 22 is adjacently arranged at a position corresponding to the opening 21c.
  • the lens portion 23 is arranged on the back surface side of the transmissive liquid crystal panel 22, and the support pillar protruding forward from the flat plate-shaped member of the lens portion 23 is in contact with the back surface of the transmissive liquid crystal panel 22.
  • the heights of the support columns are different at the top and bottom, and the tip surface thereof is also inclined with respect to the flat plate-shaped member. Therefore, the flat plate-shaped member is arranged so as to be inclined with respect to the back surface of the transmissive liquid crystal panel 22.
  • a spacer portion 24 is arranged on the back side of the lens portion 23, and the lens portion 23 and the lighting substrate 25 are in contact with each other on the front and back surfaces of the spacer portion 24, so that the distance between the lens portion 23 and the lighting substrate 25 is secured. The lens.
  • the control board 26 after mounting the transmissive liquid crystal panel 22, the lens section 23, the spacer section 24, and the lighting board 25 in the front housing 21, the control board 26 is mounted and the electrical connection section is connected. Therefore, the optical characteristics of the image forming unit can be determined by first positioning the transmissive liquid crystal panel 22, the lens unit 23, the spacer unit 24, and the lighting substrate 25 to secure their positional relationships. After that, even if the control board 26, the flexible cable 22a, the wiring cable 25b, and the connector portion 25a are handled, each portion of the image forming portion is positioned, so that the influence on the optical characteristics can be reduced.
  • the tip of the positioning pin 21b abuts on the front surface of the control board 26, and the position in the PGU housing is determined. Further, the control board 26 is not housed in the front housing 21 but in the rear housing 27. As a result, when the control board 26 is attached to the front housing 21 and the flexible cable 22a and the connector portion 25a are connected, the work can be performed at a position exposed from the front housing 21, so that the work efficiency is improved.
  • the external connector 26d is arranged so as to project rearward from the back surface side of the control board 26, and the tip of the external connector 26d is inserted into the opening 27a of the rear housing 27. Therefore, in a state where the front housing 21 and the rear housing 27 are combined to form the PGU housing, the tip of the external connector 26d is exposed from the rear housing 27. This makes it easy to connect a cable from the outside to the external connector 26d exposed from the back side of the PGU 20, and the work efficiency is improved.
  • the connector portions 26c and 26b are mounted on the back surface side of the control board 26, and the flexible cable 22a and the flexible cable 22a connected to the transmissive liquid crystal panel 22 and the lighting board 25 are provided.
  • the wiring cable 25b is drawn out to the back surface of the control board 26 and connected to the connector portions 26c and 26b. Since the connector portions 26c and 26b are mounted on the back surface side of the control board 26, the electrical connection portion can be inserted and connected to the connector portions 26c and 26b after positioning the control board 26, and the number of parts can be increased. It is possible to reduce the number and improve the efficiency of assembly work.
  • FIG. 7 is a schematic perspective view showing the work of attaching the flat plate mirror portion 30 to the housing 10 in the image projection device 100 according to the present embodiment.
  • the housing 10 includes a PGU mounting portion 11, a shelf portion 12, a wall surface 13, an opening 14, an upper frame portion 15, a protrusion 16, a slide guide 17, and a rib. 18 and a protrusion 19.
  • the PGU mounting portion 11 has a concave shape formed in a part of the housing 10, and is a portion for mounting the PGU 20.
  • An opening (not shown) is formed in the PGU mounting portion 11 at a position corresponding to the opening 21c of the PGU 20.
  • the shelf portion 12 has a stepped shape formed inside the housing 10, and a horizontal surface is formed so as to project inward from the wall surface 13.
  • the wall surface 13 is a plate-shaped portion erected in the vertical direction, and constitutes the outer shape of the housing 10.
  • the opening 14 is an opening provided on the wall surface 13, the lower side thereof coincides with the horizontal plane of the shelf portion 12, and the upper side is the upper frame portion 15.
  • the upper frame portion 15 is a frame-shaped portion that is integrally formed with the wall surface 13 and constitutes the upper side of the opening 14.
  • the protrusion 16 is a protrusion formed so as to project inward from the upper frame portion 15.
  • the slide guide 17 is a portion formed as a pillar having an L-shaped cross section in the vertical direction erected at both ends of the shelf portion 12.
  • the slide guide 17 may be formed so as to project inward from the wall surface 13. Further, the height of the slide guide 17 is about half from the horizontal plane of the shelf portion 12 to the upper frame portion 15.
  • the rib 18 is a rib-shaped portion formed so as to project inward from the wall surface 13, and the protrusion amount at the lower end is larger than that at the upper end and is tapered in the vertical direction.
  • the position where the rib 18 is formed is between the opening 14 and the slide guide 17, and is formed at the same height as the slide guide 17.
  • the protrusion 19 has a stepped shape formed so as to project upward from the horizontal plane of the shelf 12.
  • the distance between the two slide guides 17 is the same as the lateral direction of the flat plate mirror portion 30, and the flat plate mirror portion 30 is slid and inserted into the slide guide 17 from above.
  • the lower end of the flat plate mirror portion 30 abuts on the protrusion 19 and is supported, and both sides thereof abut and are supported by the slide guide 17.
  • the surface of the flat plate mirror portion 30 facing the wall surface 13 is in contact with the rib 18 and supported, and the surface facing the PGU 20 is in contact with one side of the slide guide 17 and supported.
  • the lower surface of the protrusion 16 comes into contact with the upper end of the flat plate mirror portion 30.
  • the movement in the left-right direction is restricted by the slide guide 17, the movement in the vertical direction is restricted by the protrusion 16 and the protrusion 19, and the movement in the inward / outward direction is restricted by the slide guide 17 and the rib 18. Regulated and retained in.
  • FIG. 8 is a schematic cross-sectional view showing the positioning and holding structure of the flat plate mirror portion 30 on the housing 10. Since the rib 18 has a tapered shape in the vertical direction, the flat plate mirror portion 30 can be easily inserted along the slide guide 17. Further, at the upper end position of the protrusion 19, the distance between the slide guide 17 and the rib 18 in the inside / outside direction (left-right direction in the figure) is the same as the thickness of the flat plate mirror portion 30. Therefore, in the state where the flat plate mirror portion 30 is inserted, the position of the flat plate mirror portion 30 in the inward and outward directions is accurately determined.
  • the upper frame portion 15 Since the protrusion 16 that abuts on the upper end of the flat plate mirror portion 30 is formed on the upper frame portion 15, the upper frame portion 15 is formed thin to give an appropriate elastic modulus, and during the insertion operation of the flat plate mirror portion 30.
  • the upper frame portion 15 can be elastically deformed. As a result, the flat plate mirror portion 30 can be smoothly inserted and the flat plate mirror portion 30 can be prevented from being deformed or damaged.
  • FIG. 8 the shape of the protrusion 16 protruding inward from the upper frame portion 15 is shown, but a claw extending downward is further formed at the inner tip of the protrusion 16 so as to abut on the inner surface of the flat plate mirror portion 30. May be. In this case, it is possible to restrict the movement of the upper end of the flat plate mirror portion 30 in the inward and outward directions and prevent the flat plate mirror portion 30 from collapsing.
  • the flat plate mirror portion 30 is positioned and held by the slide guide 17 formed on the housing 10, the wall surface 13 of the housing 10, and the protrusions 16 and 19. ing. This makes it possible to reduce the number of parts and improve the efficiency of assembly work.

Abstract

Provided is an image projection device that makes it possible to reduce the number of components and improve the efficiency of assembly work. The image projection device comprises image formation units (22, 25) that emit an image corresponding to an image signal, a control board (26) on which a control unit for performing drive control of the image formation units (22, 25) is mounted, and electric connection sections (22a, 25b) in which one end is electrically connected with the image formation units (22, 25) and the other end is electrically connected with the control board (26). Connectors (26b, 26c) are mounted to the control board (26) on a rear surface side which is the opposite from the surface facing the image formation units (22, 25). The other ends of the electric connection sections (22a, 25b) are connected to the connectors (26b, 26c).

Description

画像投影装置Image projection device
　本発明は、画像投影装置に関し、特に車両内の運転者等に対して画像を表示する画像投影装置に関する。 The present invention relates to an image projection device, and particularly to an image projection device that displays an image to a driver or the like in a vehicle.
　近年、車両の操舵や加減速などの運転操作の一部または全部をコンピュータが担う運転支援技術や自動運転技術の開発が進んでいる。また、車両の運転操作を人間が行う手動運転においても、車両に各種センサや通信装置を複数搭載して車両の状態や周辺状況の情報を入手して、走行時の安全性や快適性を高める走行支援技術も開発されている。 In recent years, the development of driving support technology and automatic driving technology in which a computer takes part or all of driving operations such as steering and acceleration / deceleration of a vehicle is progressing. In addition, even in manual driving in which a human performs the driving operation of the vehicle, the vehicle is equipped with multiple sensors and communication devices to obtain information on the condition of the vehicle and the surrounding conditions, thereby improving safety and comfort during driving. Driving support technology is also being developed.
　このような運転支援技術、自動運転技術または走行支援技術においては、車両の状態や周辺状況、コンピュータの運転操作状況など、得られた各種情報を搭乗者に画像等を用いて提示している。従来から、各種情報を提示するためには車両内に画像表示装置を搭載して、画像表示装置上に文字や画像を表示することが一般的であった。 In such driving support technology, automatic driving technology, or driving support technology, various obtained information such as the state of the vehicle, the surrounding situation, and the driving operation state of the computer are presented to the passengers using images and the like. Conventionally, in order to present various information, it has been common to mount an image display device in a vehicle and display characters and images on the image display device.
　しかし、車両に備えられた画像表示装置で情報を提示すると、搭乗者や運転者が視線を走行方向前方から逸して画像表示装置を見る必要があるため好ましくない。そこで、車両の前方からの視線移動を小さくしながらも画像情報を提示するために、車両のウィンドシールドに画像を投影して、反射した光を視認させるＨＵＤ（Ｈｅａｄ　Ｕｐ　Ｄｉｓｐｌａｙ）装置が提案されている（例えば特許文献１を参照）。 However, it is not preferable to present the information on the image display device provided in the vehicle because the passenger or the driver needs to look away from the front in the traveling direction to see the image display device. Therefore, in order to present image information while reducing the movement of the line of sight from the front of the vehicle, a HUD (Head Up Display) device has been proposed that projects an image on the windshield of the vehicle to visually recognize the reflected light. (See, for example, Patent Document 1).
　特許文献１に記載された従来技術のＨＵＤ装置は、ハウジングにＰＧＵ（Ｐｉｃｔｕｒｅ　Ｇｅｎｅｒａｔｉｏｎ　Ｕｎｉｔ）と、平板ミラーと、凹面ミラーが取り付けられている。このＨＵＤ装置では、ＰＧＵ内の液晶等に画像を表示し、光源部から照射された光で画像を照射して平板ミラーおよび拡大ミラーで複数回反射させたうえで、車両のウィンドシールドによる反射で搭乗者に画像を視認させている。このようなＨＵＤ装置では、ＰＧＵから照射された画像が平板ミラーと拡大ミラーで繰り返し反射されることで光路長を確保し、投影される画像のサイズを大きくすることができる。 The conventional HUD device described in Patent Document 1 has a PGU (Picture Generation Unit), a flat plate mirror, and a concave mirror attached to a housing. In this HUD device, an image is displayed on a liquid crystal display in the PGU, the image is irradiated with the light emitted from the light source, reflected multiple times by a flat mirror and a magnifying mirror, and then reflected by the windshield of the vehicle. The image is visually recognized by the passenger. In such a HUD device, the image emitted from the PGU is repeatedly reflected by the flat plate mirror and the magnifying mirror to secure the optical path length and increase the size of the projected image.
特開２０１９－１１９２６２号公報JP-A-2019-119262
　しかし、従来技術のＨＵＤ装置では、ＰＧＵや平板ミラーなどの複数の部材をハウジングに正確に位置決めして固定する必要がある。また、ＰＧＵの内部にはＬＥＤ（Ｌｉｇｈｔ　Ｅｍｉｔｔｉｎｇ　Ｄｉｏｄｅ）を搭載した照明基板や、液晶パネル、レンズ、駆動回路を搭載した制御基板等がＰＧＵハウジング内収容されている。これらの各部をネジやボルト等の締結部材で固定すると、部品点数が増加し組立工程も煩雑化する。また、各部の電気的接続を確保するためのケーブル類は、軽量化と省スペース化のために可能な限り短くされており、接続作業や固定作業時の取り回しが困難で作業性が低下するという問題があった。 However, in the conventional HUD device, it is necessary to accurately position and fix a plurality of members such as a PGU and a flat plate mirror to the housing. Further, inside the PGU, a lighting board equipped with an LED (Light Emitting Diode), a liquid crystal panel, a lens, a control board equipped with a drive circuit, and the like are housed in the PGU housing. If each of these parts is fixed with a fastening member such as a screw or a bolt, the number of parts increases and the assembly process becomes complicated. In addition, the cables for ensuring the electrical connection of each part are shortened as much as possible in order to reduce the weight and space, and it is difficult to handle during connection work and fixing work, which reduces workability. There was a problem.
　そこで本発明は、上記従来の問題点に鑑みなされたものであり、部品点数を削減するとともに組立作業の効率を改善することが可能な画像投影装置を提供することを目的とする。 Therefore, the present invention has been made in view of the above-mentioned conventional problems, and an object of the present invention is to provide an image projection device capable of reducing the number of parts and improving the efficiency of assembly work.
　上記課題を解決するために、本発明の画像投影装置は、画像信号に応じた画像を照射する画像形成部と、前記画像形成部を駆動制御する制御部が搭載された制御基板と、一端が前記画像形成部と電気的に接続され、他端が前記制御基板と電気的に接続された電気接続部とを有し、前記制御基板には、前記画像形成部に対向する面とは反対である裏面側にコネクタ部が搭載されており、前記電気接続部の前記他端は前記コネクタ部に接続されていることを特徴とする。 In order to solve the above problems, the image projection device of the present invention has an image forming unit that irradiates an image according to an image signal, a control board on which a control unit that drives and controls the image forming unit is mounted, and one end thereof. The control board has an electrical connection that is electrically connected to the image forming portion and the other end of which is electrically connected to the control board, and the control board has a surface opposite to the surface facing the image forming portion. A connector portion is mounted on a certain back surface side, and the other end of the electrical connection portion is connected to the connector portion.
　このような本発明の画像投影装置では、制御基板の裏面側にコネクタ部が搭載されていることで、制御基板の位置決めをした後に電気接続部をコネクタ部に挿入して接続することができ、部品点数を削減するとともに組立作業の効率を改善することが可能となる。 In such an image projection device of the present invention, since the connector portion is mounted on the back surface side of the control board, the electrical connection portion can be inserted into the connector portion and connected after positioning the control board. It is possible to reduce the number of parts and improve the efficiency of assembly work.
　また本発明の一態様では、前記画像形成部は、透過型液晶パネルと、前記透過型液晶パネルの背面側に配置された照明基板とを備え、前記電気接続部は、前記透過型液晶パネルと前記制御基板とを電気的に接続するフレキシブルケーブルと、前記照明基板と前記制御基板とを電気的に接続する配線ケーブルを備える。 Further, in one aspect of the present invention, the image forming portion includes a transmissive liquid crystal panel and a lighting substrate arranged on the back side of the transmissive liquid crystal panel, and the electrical connection portion is the transmissive liquid crystal panel. A flexible cable for electrically connecting the control board and a wiring cable for electrically connecting the lighting board and the control board are provided.
　また本発明の一態様では、前記コネクタ部は挿入型コネクタであり、前記電気接続部の前記他端を前記制御基板の面内方向に沿って挿入するものである。 Further, in one aspect of the present invention, the connector portion is an insertion type connector, and the other end of the electrical connection portion is inserted along the in-plane direction of the control board.
　また本発明の一態様では、前記制御基板には、周縁部の一部が切り欠かれた切欠部が形成されており、前記電気接続部は、前記切欠部を介して前記画像形成部側から前記裏面側に引き出されている。 Further, in one aspect of the present invention, the control board is formed with a notch portion in which a part of the peripheral edge portion is cut out, and the electrical connection portion is formed from the image forming portion side via the notch portion. It is pulled out to the back surface side.
　また本発明の一態様では、前記画像形成部および前記制御基板を収容するＰＧＵハウジングを有し、前記画像形成部および前記制御基板は、前記ＰＧＵハウジングに対して一括して締結部材で固定されている。 Further, in one aspect of the present invention, the image forming portion and the PGU housing for accommodating the control board are provided, and the image forming portion and the control board are collectively fixed to the PGU housing by a fastening member. There is.
　また本発明の一態様では、前記ＰＧＵハウジングは、前記画像形成部の画像照射方向に配置された前方ハウジングと、前記制御基板の裏面側に配置された後方ハウジングとを備え、前記制御基板の裏面側には、外部と電気的に接続される外部コネクタが搭載されており、前記後方ハウジングには、前記外部コネクタと対応する位置に開口部が形成され、前記開口部に前記外部コネクタの先端が挿入されている。 Further, in one aspect of the present invention, the PGU housing includes a front housing arranged in the image irradiation direction of the image forming portion and a rear housing arranged on the back surface side of the control board, and the back surface of the control board is provided. An external connector electrically connected to the outside is mounted on the side, an opening is formed in the rear housing at a position corresponding to the external connector, and the tip of the external connector is formed in the opening. It has been inserted.
　また本発明の一態様では、前記画像形成部から照射された光を反射する平板状の平板ミラー部を備え、前記平板ミラー部は、筐体に形成されたスライドガイドと、前記筐体の壁面と、前記筐体に形成された突起部によって位置決めされ保持されている。 Further, in one aspect of the present invention, a flat plate mirror portion that reflects light emitted from the image forming portion is provided, and the flat plate mirror portion includes a slide guide formed in the housing and a wall surface of the housing. And, it is positioned and held by the protrusion formed on the housing.
　また本発明の一態様では、前記スライドガイドは、前記平板ミラー部の水平方向における両端に設けられており、前記突起部は、前記平板ミラー部の上下方向における両端に設けられている。 Further, in one aspect of the present invention, the slide guides are provided at both ends of the flat plate mirror portion in the horizontal direction, and the protrusions are provided at both ends of the flat plate mirror portion in the vertical direction.
　本発明では、部品点数を削減するとともに組立作業の効率を改善することが可能な画像投影装置を提供することができる。 The present invention can provide an image projection device capable of reducing the number of parts and improving the efficiency of assembly work.
本発明の第１実施形態に係る画像投影装置１００の概要を示す分解斜視図である。It is an exploded perspective view which shows the outline of the image projection apparatus 100 which concerns on 1st Embodiment of this invention. 画像投影装置１００のＰＧＵ２０の概要を示す分解斜視図である。It is an exploded perspective view which shows the outline of the PGU 20 of the image projection apparatus 100. ＰＧＵ２０の組み立て作業を示す分解斜視図である。It is an exploded perspective view which shows the assembly work of PGU20. ＰＧＵ２０の内部での各部の位置関係を示す模式断面図である。It is a schematic cross-sectional view which shows the positional relationship of each part in PGU20. ＰＧＵ２０の内部における電気的接続を示す模式斜視図である。It is a schematic perspective view which shows the electrical connection inside the PGU 20. ＰＧＵ２０の組み立て状態を示す模式断面図である。It is a schematic cross-sectional view which shows the assembled state of PGU20. 本発明の第２実施形態に係る画像投影装置１００における筐体１０への平板ミラー部３０の取り付け作業を示す模式斜視図である。It is a schematic perspective view which shows the attachment work of the flat plate mirror part 30 to the housing 10 in the image projection apparatus 100 which concerns on 2nd Embodiment of this invention. 筐体１０への平板ミラー部３０の位置決めおよび保持構造を示す模式断面図である。It is a schematic cross-sectional view which shows the positioning and holding structure of the flat plate mirror part 30 with respect to the housing 10.
　（第１実施形態）
　以下、本発明の実施の形態について、図面を参照して詳細に説明する。各図面に示される同一または同等の構成要素、部材、処理には、同一の符号を付すものとし、適宜重複した説明は省略する。図１は、本実施形態に係る画像投影装置１００の概要を示す分解斜視図である。図１に示すように画像投影装置１００は、筐体１０と、ＰＧＵ２０と、平板ミラー部３０と、拡大ミラー部４０と、天板部５０と、透光カバー６０を備えている。 (First Embodiment)
Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. The same or equivalent components, members, and processes shown in the drawings are designated by the same reference numerals, and duplicate description thereof will be omitted as appropriate. FIG. 1 is an exploded perspective view showing an outline of the image projection device 100 according to the present embodiment. As shown in FIG. 1, the image projection device 100 includes a housing 10, a PGU 20, a flat plate mirror unit 30, a magnifying mirror unit 40, a top plate unit 50, and a translucent cover 60.
　筐体１０は、画像投影装置１００の外形を構成する部材であり、上面が開放された容器形状を為している。筐体１０の背面側（図１中における右方向）には、外部にＰＧＵ２０が取り付けられる。筐体１０の内部には、平板ミラー部３０および拡大ミラー部４０が収容されて保持されている。筐体１０の開放された上部には天板部５０が装着されて、天板部５０で筐体１０の内部が覆われている。筐体１０を構成する材料は限定されず、通常の車両内部に用いられる金属や樹脂で構成することができる。 The housing 10 is a member that constitutes the outer shape of the image projection device 100, and has a container shape with an open upper surface. The PGU 20 is externally attached to the back side of the housing 10 (to the right in FIG. 1). A flat mirror portion 30 and a magnifying mirror portion 40 are housed and held inside the housing 10. A top plate portion 50 is attached to the open upper portion of the housing 10, and the inside of the housing 10 is covered with the top plate portion 50. The material constituting the housing 10 is not limited, and can be made of a metal or resin used inside a normal vehicle.
　ＰＧＵ２０は、外部から供給される電力と制御信号に基づいて、画像を含んだ光を筐体１０内部に対して照射するユニットである。筐体１０のＰＧＵ２０取り付け位置に対応して図示しない開口部が形成されており、ＰＧＵ２０が照射する光は当該開口部から筐体１０の内部に照射される。ＰＧＵ２０の構造については後述する。 The PGU 20 is a unit that irradiates the inside of the housing 10 with light including an image based on an electric power supplied from the outside and a control signal. An opening (not shown) is formed corresponding to the PGU 20 mounting position of the housing 10, and the light emitted by the PGU 20 is emitted from the opening to the inside of the housing 10. The structure of PGU20 will be described later.
　平板ミラー部３０は、一方の面に反射鏡が形成された平板状の部材であり、筐体１０の前方（図１中における左方向）において、筐体１０の内側に保持されている。平板ミラー部３０の取り付け位置は、ＰＧＵ２０が照射した光の光路上であり、ＰＧＵ２０からの光の光軸に対して所定の角度傾斜して配置されている。したがって、ＰＧＵ２０が照射した光は、平板ミラー部３０に入射した後に反射されて、筐体１０の背面方向に進行する。 The flat plate mirror portion 30 is a flat plate-shaped member having a reflecting mirror formed on one surface, and is held inside the housing 10 in front of the housing 10 (to the left in FIG. 1). The mounting position of the flat plate mirror portion 30 is on the optical path of the light irradiated by the PGU 20, and is arranged so as to be inclined at a predetermined angle with respect to the optical axis of the light from the PGU 20. Therefore, the light emitted by the PGU 20 is reflected after being incident on the flat plate mirror portion 30 and travels toward the back surface of the housing 10.
　拡大ミラー部４０は、一方の面に反射鏡が形成された曲面形状を有する部材であり、筐体１０の後方において、筐体１０の内側に保持されている。拡大ミラー部４０の取り付け位置は、平板ミラー部３０が反射した光の光路上であり、平板ミラー部３０からの光の光軸に対して所定の角度傾斜して配置されている。したがって、平板ミラー部３０が反射した光は、拡大ミラー部４０に入射した後に再度反射されて、透光カバー６０方向に進行する。図１では、拡大ミラー部４０の曲面形状として、左右方向に湾曲した凹面鏡を示しているが、画像を投影するための光学設計に適したものであればどのような形状であってもよい。 The magnifying mirror portion 40 is a member having a curved surface shape in which a reflecting mirror is formed on one surface, and is held inside the housing 10 behind the housing 10. The mounting position of the magnifying mirror portion 40 is on the optical path of the light reflected by the flat plate mirror portion 30, and is arranged so as to be inclined at a predetermined angle with respect to the optical axis of the light from the flat plate mirror portion 30. Therefore, the light reflected by the flat plate mirror unit 30 is reflected again after being incident on the magnifying mirror unit 40, and travels in the direction of the translucent cover 60. FIG. 1 shows a concave mirror curved in the left-right direction as the curved surface shape of the magnifying mirror portion 40, but any shape may be used as long as it is suitable for optical design for projecting an image.
　天板部５０は、筐体１０の上部に開放された開口部を覆うように配置された蓋状の部材であり、一部に開口部分が形成されている。天板部５０の構造や形状、材料は限定されないが、筐体１０の内部に埃等が侵入しない程度の密閉性を備えていることが好ましい。また、開口部分には透光カバー６０が取り付けられている。 The top plate portion 50 is a lid-shaped member arranged so as to cover the opening portion opened at the upper part of the housing 10, and the opening portion is partially formed. The structure, shape, and material of the top plate portion 50 are not limited, but it is preferable that the top plate portion 50 has an airtightness to the extent that dust or the like does not enter the inside of the housing 10. Further, a translucent cover 60 is attached to the opening portion.
　透光カバー６０は、可視光を透過する材料で構成された板状の部材であり、天板部５０に形成された開口部分を塞ぐように配置されている。透光カバー６０の取り付け位置は、拡大ミラー部４０が反射した光の光路上であり、拡大ミラー部４０からの光を透過して画像投影装置１００の外部に照射する。また、透光カバー６０は、車両のウィンドシールド直下に位置しており、透光カバー６０を透過した光はウィンドシールドに入射して反射される。 The translucent cover 60 is a plate-shaped member made of a material that transmits visible light, and is arranged so as to close the opening portion formed in the top plate portion 50. The mounting position of the translucent cover 60 is on the optical path of the light reflected by the magnifying mirror unit 40, and the light from the magnifying mirror unit 40 is transmitted to irradiate the outside of the image projection device 100. Further, the translucent cover 60 is located directly under the windshield of the vehicle, and the light transmitted through the translucent cover 60 is incident on the windshield and reflected.
　本実施形態の画像投影装置１００は、車両の室内側においてウィンドシールド（図示せず）の直下に搭載され、ウィンドシールドに対して画像が投影される。画像投影装置１００では、ＰＧＵ２０が光を照射して画像を投影し、筐体１０内で画像の光が平板ミラー部３０と拡大ミラー部４０で反射される。拡大ミラー部４０で反射された画像の光は、透光カバー６０を介して車両のウィンドシールド（図示せず）に照射されて反射され、車両の搭乗者方向に画像が投影される。搭乗者は、視点に入射した光により画像を視認する。 The image projection device 100 of the present embodiment is mounted directly under the windshield (not shown) on the indoor side of the vehicle, and an image is projected onto the windshield. In the image projection device 100, the PGU 20 irradiates light to project an image, and the light of the image is reflected by the flat plate mirror unit 30 and the magnifying mirror unit 40 in the housing 10. The light of the image reflected by the magnifying mirror unit 40 is irradiated to the windshield (not shown) of the vehicle through the translucent cover 60 and reflected, and the image is projected toward the passenger of the vehicle. The passenger visually recognizes the image by the light incident on the viewpoint.
　図２は、画像投影装置１００のＰＧＵ２０の概要を示す分解斜視図である。図２に示すようにＰＧＵ２０は、前方ハウジング２１と、透過型液晶パネル２２と、レンズ部２３と、スペーサー部２４と、照明基板２５と、制御基板２６と、後方ハウジング２７を備えている。 FIG. 2 is an exploded perspective view showing an outline of the PGU 20 of the image projection device 100. As shown in FIG. 2, the PGU 20 includes a front housing 21, a transmissive liquid crystal panel 22, a lens unit 23, a spacer unit 24, a lighting substrate 25, a control substrate 26, and a rear housing 27.
　前方ハウジング２１は、ＰＧＵ２０の外形の一部を構成する部材であり、ＰＧＵ２０の画像照射方向に配置されている。前方ハウジング２１には部分的に開口部が設けられおり、当該開口部は筐体１０の背面側に設けられた開口部に対応した位置に形成されている。後述する画像形成部から照射された光は、前方ハウジング２１に形成された開口部から筐体１０の開口部を介して筐体１０内に照射される。 The front housing 21 is a member that constitutes a part of the outer shape of the PGU 20, and is arranged in the image irradiation direction of the PGU 20. The front housing 21 is partially provided with an opening, and the opening is formed at a position corresponding to the opening provided on the back side of the housing 10. The light emitted from the image forming portion, which will be described later, is emitted from the opening formed in the front housing 21 into the housing 10 through the opening of the housing 10.
　透過型液晶パネル２２は、制御基板２６から供給される電力と画像信号に基づいて画像を形成する液晶表示素子であり、画素毎に液晶分子の配向を制御することで、背面側から照射された光の透過、非透過を制御する。透過型液晶パネル２２は、前方ハウジング２１の背面側に位置決めして固定されており、透過型液晶パネル２２を透過した光が前方ハウジング２１の開口部を介して前方に照射される。 The transmissive liquid crystal panel 22 is a liquid crystal display element that forms an image based on the electric power supplied from the control substrate 26 and an image signal, and is irradiated from the back side by controlling the orientation of the liquid crystal molecules for each pixel. Controls the transmission and non-transmission of light. The transmissive liquid crystal panel 22 is positioned and fixed to the back side of the front housing 21, and the light transmitted through the transmissive liquid crystal panel 22 is radiated forward through the opening of the front housing 21.
　レンズ部２３は、透光性材料で形成された光学部材であり、照明基板２５が照射する光の拡がり角を調整する部材である。図１および図２に示した例では、レンズ部２３は平板状部材に複数の凸面レンズが形成されるとともに複数の支持柱が形成されている。レンズ部２３は透過型液晶パネル２２の背面側に配置され、複数の支持柱が透過型液晶パネル２２の背面に当接して、凸面レンズと透過型液晶パネル２２との距離が確保される。 The lens unit 23 is an optical member made of a translucent material, and is a member that adjusts the spread angle of the light emitted by the lighting substrate 25. In the example shown in FIGS. 1 and 2, in the lens portion 23, a plurality of convex lenses are formed on a flat plate-shaped member, and a plurality of support columns are formed. The lens unit 23 is arranged on the back surface side of the transmissive liquid crystal panel 22, and a plurality of support columns abut on the back surface of the transmissive liquid crystal panel 22 to secure a distance between the convex lens and the transmissive liquid crystal panel 22.
　スペーサー部２４は、レンズ部２３と照明基板２５との間に配置され、両者の相対的な位置を決めるとともに間隔を確保するための部材である。図１に示した例では、スペーサー部２４は略板状の形状を有しており、レンズ部２３の凸面レンズに対応した位置に複数の開口部が形成されている。スペーサー部２４を構成する材料は限定されないが、照明基板２５から照射された光がレンズ部２３に入射する領域を開口部に限定するために、遮光性の樹脂材料を用いることが好ましい。 The spacer portion 24 is arranged between the lens portion 23 and the lighting substrate 25, and is a member for determining a relative position between the two and ensuring a distance between them. In the example shown in FIG. 1, the spacer portion 24 has a substantially plate-like shape, and a plurality of openings are formed at positions corresponding to the convex lens of the lens portion 23. The material constituting the spacer portion 24 is not limited, but it is preferable to use a light-shielding resin material in order to limit the region where the light emitted from the lighting substrate 25 is incident on the lens portion 23 to the opening portion.
　照明基板２５は、配線が形成された基板上に複数のＬＥＤが搭載された部材であり、制御基板２６から供給される電力と制御信号に基づいて、ＬＥＤが点灯して光を前方に照射する。図１に示した例では、照明基板２５上に搭載されたＬＥＤの配置は、レンズ部２３の凸面レンズおよびスペーサー部２４の開口部に対応している。 The lighting board 25 is a member in which a plurality of LEDs are mounted on a board on which wiring is formed, and the LEDs are turned on to irradiate light forward based on the electric power and the control signal supplied from the control board 26. .. In the example shown in FIG. 1, the arrangement of the LEDs mounted on the lighting substrate 25 corresponds to the convex lens of the lens portion 23 and the opening of the spacer portion 24.
　透過型液晶パネル２２、レンズ部２３、スペーサー部２４および照明基板２５は、本発明における画像形成部を構成している。画像形成部では、照明基板２５のＬＥＤが制御基板２６からの電力と制御信号に基づいて発光し、ＬＥＤの光はスペーサー部２４の開口部を介してレンズ部２３の凸面レンズに入射する。また、透過型液晶パネル２２が制御基板２６からの電力と画像信号に基づいて画像を表示し、レンズ部２３に入射した光が拡がり角を調整されて透過型液晶パネル２２を透過し、表示された画像が前方ハウジング２１の開口部から前方に投影される。 The transmissive liquid crystal panel 22, the lens unit 23, the spacer unit 24, and the lighting substrate 25 constitute the image forming unit in the present invention. In the image forming section, the LED of the lighting board 25 emits light based on the electric power and the control signal from the control board 26, and the light of the LED is incident on the convex lens of the lens section 23 through the opening of the spacer section 24. Further, the transmissive liquid crystal panel 22 displays an image based on the power from the control board 26 and the image signal, and the light incident on the lens unit 23 is adjusted in the spreading angle to be transmitted through the transmissive liquid crystal panel 22 and displayed. The image is projected forward from the opening of the front housing 21.
　制御基板２６は、基板上に配線パターンが形成され、複数の電子部品が搭載されて制御回路（制御部）を構成する部材である。制御基板２６は、画像投影装置１００の外部から電力および信号が供給され、基板上に構成された制御回路によって予め定められた情報処理が実行されて、画像形成部である透過型液晶パネル２２および照明基板２５に対して電力と画像信号、制御信号を伝達して、画像形成部を駆動制御する。 The control board 26 is a member in which a wiring pattern is formed on the board and a plurality of electronic components are mounted to form a control circuit (control unit). Power and signals are supplied from the outside of the image projection device 100 to the control board 26, and predetermined information processing is executed by the control circuit configured on the board, and the transmissive liquid crystal panel 22 and the transmissive liquid crystal panel 22 which are image forming units are executed. Electric power, an image signal, and a control signal are transmitted to the lighting substrate 25 to drive and control the image forming unit.
　後方ハウジング２７は、ＰＧＵ２０の外形の一部を構成する部材であり、制御基板２６の裏面側（背面側）に配置されている。後方ハウジング２７は前方ハウジング２１に嵌合されて一つの容器を構成し、前方ハウジング２１と後方ハウジング２７は本発明におけるＰＧＵハウジングに相当している。前方ハウジング２１および後方ハウジング２７からなるＰＧＵハウジングの内部には、上述した画像形成部と制御基板２６が収容されている。 The rear housing 27 is a member that constitutes a part of the outer shape of the PGU 20, and is arranged on the back surface side (rear surface side) of the control board 26. The rear housing 27 is fitted to the front housing 21 to form one container, and the front housing 21 and the rear housing 27 correspond to the PGU housing in the present invention. The image forming unit and the control board 26 described above are housed inside the PGU housing including the front housing 21 and the rear housing 27.
　図３は、ＰＧＵ２０の組み立て作業を示す分解斜視図である。図３に示した例では、前方ハウジング２１内に透過型液晶パネル２２、レンズ部２３、スペーサー部２４および照明基板２５を収容した状態を示している。 FIG. 3 is an exploded perspective view showing the assembly work of the PGU 20. In the example shown in FIG. 3, a state in which the transmissive liquid crystal panel 22, the lens portion 23, the spacer portion 24, and the lighting substrate 25 are housed in the front housing 21 is shown.
　図３に示したように、透過型液晶パネル２２からは後方にフレキシブルケーブル２２ａが導出されており、先端にコネクタ部２５ａが取り付けられた配線ケーブル２５ｂが照明基板２５の背面から導出されている。また、前方ハウジング２１には、固定部２１ａおよび位置決めピン２１ｂが形成されている。 As shown in FIG. 3, the flexible cable 22a is led out from the transmissive liquid crystal panel 22 to the rear, and the wiring cable 25b to which the connector portion 25a is attached to the tip is led out from the back surface of the lighting board 25. Further, the front housing 21 is formed with a fixing portion 21a and a positioning pin 21b.
　フレキシブルケーブル２２ａは、複数の配線を上下両側から樹脂層で封止した可撓性を有する導電性のケーブルであり、一端側は透過型液晶パネル２２の各配線パターンに電気的に接続されて、外部からの電力と画像信号を透過型液晶パネル２２に供給するための電気接続部である。フレキシブルケーブル２２ａの他端側は、後述するコネクタ部２６ｃに挿入されてコネクタ部２６ｃと電気的に接続される。 The flexible cable 22a is a flexible conductive cable in which a plurality of wirings are sealed from both upper and lower sides with resin layers, and one end side thereof is electrically connected to each wiring pattern of the transmissive liquid crystal panel 22. It is an electrical connection portion for supplying electric power and an image signal from the outside to the transmissive liquid crystal panel 22. The other end of the flexible cable 22a is inserted into the connector portion 26c described later and electrically connected to the connector portion 26c.
　コネクタ部２５ａは、配線ケーブル２５ｂの先端に取り付けられたオス型のコネクタであり、後述するコネクタ部２６ｂに挿入されてコネクタ部２６ｂと電気的に接続される。配線ケーブル２５ｂは、複数の導電材料を束ねた電気接続部であり、一端側は照明基板２５の背面側で照明基板２５上の配線パターンにハンダ付けされて、外部からの電力と制御信号を照明基板２５に供給するための電気接続部である。配線ケーブル２５ｂの他端側にはコネクタ部２５ａが取り付けられている。 The connector portion 25a is a male type connector attached to the tip of the wiring cable 25b, and is inserted into the connector portion 26b described later and electrically connected to the connector portion 26b. The wiring cable 25b is an electrical connection portion in which a plurality of conductive materials are bundled, and one end side is soldered to a wiring pattern on the lighting board 25 on the back side of the lighting board 25 to illuminate power and control signals from the outside. It is an electric connection part for supplying to the substrate 25. A connector portion 25a is attached to the other end side of the wiring cable 25b.
　固定部２１ａは、後述する締結部材２８を締結するためのネジ穴であり、後方ハウジング２７の締結孔２７ｂに対応する位置に形成されている。位置決めピン２１ｂは、前方ハウジング２１内における制御基板２６の位置決めをするための部分であり、後方に突出したピン形状をなしている。 The fixing portion 21a is a screw hole for fastening the fastening member 28 described later, and is formed at a position corresponding to the fastening hole 27b of the rear housing 27. The positioning pin 21b is a portion for positioning the control board 26 in the front housing 21, and has a pin shape protruding rearward.
　また図３に示したように、制御基板２６には切欠部２６ａおよび貫通孔２６ｅが形成されており、裏面上にはコネクタ部２６ｂ，２６ｃおよび外部コネクタ２６ｄが搭載されている。 Further, as shown in FIG. 3, a notch 26a and a through hole 26e are formed in the control board 26, and the connector portions 26b and 26c and the external connector 26d are mounted on the back surface.
　切欠部２６ａは、制御基板２６の周縁部において一部が切り欠かれた形状とされた部分であり、切欠部２６ａが形成されていることで、制御基板２６は矩形状の一部が欠けたコの字形状となっている。切欠部２６ａのサイズは限定されないが、後述するように切欠部２６ａによって形成されたＰＧＵハウジングとの隙間にフレキシブルケーブル２２ａと配線ケーブル２５ｂを通すため、両者の厚みよりも大きいサイズを切り欠くことが好ましい。また、配線ケーブル２５ｂの先端にコネクタ部２５ａが取り付けられていても、切欠部２６ａとＰＧＵハウジングの隙間にコネクタ部２５ａを通すことができる程度の大きさであることが好ましい。 The cutout portion 26a is a portion of the peripheral portion of the control board 26 having a partially cutout shape, and the cutout portion 26a is formed, so that the control board 26 lacks a rectangular part. It has a U-shape. The size of the notch 26a is not limited, but as will be described later, since the flexible cable 22a and the wiring cable 25b are passed through the gap between the PGU housing formed by the notch 26a, a size larger than the thickness of both may be cut out. preferable. Further, even if the connector portion 25a is attached to the tip of the wiring cable 25b, the size is preferably such that the connector portion 25a can be passed through the gap between the notch portion 26a and the PGU housing.
　コネクタ部２６ｂ，２６ｃは、制御基板２６の裏面側に搭載されたメス型のコネクタであり、制御基板２６上の配線パターンに電気的に接続されている。コネクタ部２６ｂの形状は、配線ケーブル２５ｂの先端に取り付けられたコネクタ部２５ａが嵌合する形状である。コネクタ部２５ａがコネクタ部２６ｂに挿入されることで、制御基板２６と照明基板２５との間で電気的接続が確保され、制御基板２６と照明基板２５の間で電力と制御信号が伝達される。コネクタ部２６ｃの形状は、フレキシブルケーブル２２ａの先端が嵌合する形状である。フレキシブルケーブル２２ａがコネクタ部２６ｃに挿入されることで、制御基板２６と透過型液晶パネル２２との間で電気的接続が確保され、制御基板２６と透過型液晶パネル２２の間で電力と画像信号が伝達される。 The connector portions 26b and 26c are female connectors mounted on the back surface side of the control board 26, and are electrically connected to the wiring pattern on the control board 26. The shape of the connector portion 26b is such that the connector portion 25a attached to the tip of the wiring cable 25b fits into the connector portion 26b. By inserting the connector portion 25a into the connector portion 26b, an electrical connection is secured between the control board 26 and the lighting board 25, and power and a control signal are transmitted between the control board 26 and the lighting board 25. .. The shape of the connector portion 26c is such that the tip of the flexible cable 22a fits into the connector portion 26c. By inserting the flexible cable 22a into the connector portion 26c, an electrical connection is secured between the control board 26 and the transmissive liquid crystal panel 22, and power and image signals are secured between the control board 26 and the transmissive liquid crystal panel 22. Is transmitted.
　また、コネクタ部２６ｂ，２６ｃは挿入型コネクタであり、その挿入口は切欠部２６ａ方向に向いて配置されている。したがって、切欠部２６ａを介して制御基板２６の裏面側にまで引き出されたフレキシブルケーブル２２ａおよび配線ケーブル２５ｂは、制御基板２６の面内方向に沿って先端またはコネクタ部２５ａを挿入することで、電気的接続を行うことができる。ここで制御基板２６の裏面側とは、制御基板２６のうち画像形成部に対向する面（前面）とは反対側の面である。 Further, the connector portions 26b and 26c are insertion type connectors, and their insertion openings are arranged so as to face the notch portion 26a direction. Therefore, the flexible cable 22a and the wiring cable 25b pulled out to the back surface side of the control board 26 through the notch 26a are electrically connected by inserting the tip or the connector portion 25a along the in-plane direction of the control board 26. Connection can be made. Here, the back surface side of the control board 26 is a surface of the control board 26 opposite to the surface (front surface) facing the image forming portion.
　外部コネクタ２６ｄは、制御基板２６の裏面側に搭載されたメス型のコネクタであり、制御基板２６上の配線パターンに電気的に接続されている。外部コネクタ２６ｄは挿入型コネクタであり、制御基板２６の面に略垂直方向にＰＧＵ２０の外部から外部ケーブルのコネクタが挿入されることで、外部から制御基板２６に電力および信号が供給される。貫通孔２６ｅは、固定部２１ａに対応した位置に形成された孔であり、後述する締結部材２８が挿入される。 The external connector 26d is a female connector mounted on the back surface side of the control board 26, and is electrically connected to the wiring pattern on the control board 26. The external connector 26d is an insertion type connector, and power and signals are supplied to the control board 26 from the outside by inserting the connector of the external cable from the outside of the PGU 20 in a substantially vertical direction on the surface of the control board 26. The through hole 26e is a hole formed at a position corresponding to the fixing portion 21a, and a fastening member 28 described later is inserted into the through hole 26e.
　後方ハウジング２７には、外部コネクタ２６ｄに対応した位置に開口部２７ａが形成され、固定部２１ａおよび貫通孔２６ｅに対応した位置に締結孔２７ｂが形成されている。開口部２７ａは外部コネクタ２６ｄの先端が挿入されて、ＰＧＵ２０の背面から外部コネクタ２６ｄを露出させるための開口である。締結孔２７ｂは、ネジ等の締結部材２８を挿入して、画像形成部および制御基板２６をＰＧＵハウジングに一括して固定するための部材である。 In the rear housing 27, an opening 27a is formed at a position corresponding to the external connector 26d, and a fastening hole 27b is formed at a position corresponding to the fixing portion 21a and the through hole 26e. The opening 27a is an opening for inserting the tip of the external connector 26d to expose the external connector 26d from the back surface of the PGU 20. The fastening hole 27b is a member for inserting a fastening member 28 such as a screw to collectively fix the image forming portion and the control substrate 26 to the PGU housing.
　図４は、ＰＧＵ２０の内部での各部の位置関係を示す模式断面図である。照明基板２５の前面には、複数のＬＥＤ２５ｃが搭載されている。図４では説明を簡略化するためにスペーサー部２４および後方ハウジング２７については図示を省略している。図４に示したように、前方ハウジング２１内に収容された透過型液晶パネル２２および照明基板２５からは、それぞれフレキシブルケーブル２２ａおよび配線ケーブル２５ｂが、制御基板２６の切欠部２６ａを介して裏面側に引き出される。これは、制御基板２６に切欠部２６ａが形成されていることで、前方ハウジング２１と制御基板２６の間に切欠部２６ａの隙間が確保されることによる。 FIG. 4 is a schematic cross-sectional view showing the positional relationship of each part inside the PGU 20. A plurality of LEDs 25c are mounted on the front surface of the lighting substrate 25. In FIG. 4, the spacer portion 24 and the rear housing 27 are not shown for the sake of brevity. As shown in FIG. 4, from the transmissive liquid crystal panel 22 and the lighting board 25 housed in the front housing 21, the flexible cable 22a and the wiring cable 25b are located on the back surface side of the control board 26 via the notch 26a, respectively. Is pulled out to. This is because the notch 26a is formed in the control board 26, so that a gap of the notch 26a is secured between the front housing 21 and the control board 26.
　これにより、図３に示したように前方ハウジング２１に予め画像形成部（透過型液晶パネル２２、レンズ部２３、スペーサー部２４および照明基板２５）を取り付けた後に、制御基板２６を前方ハウジング２１に取り付け、切欠部２６ａからフレキシブルケーブル２２ａおよび配線ケーブル２５ｂを裏面側に引き出すことができる。また、切欠部２６ａから裏面側に引き出したフレキシブルケーブル２２ａの先端および配線ケーブル２５ｂのコネクタ部２５ａを、制御基板２６の面内方向に移動させるだけでそれぞれコネクタ部２６ｃ，２６ｂに挿入して嵌合させることができ、組立作業が容易となる。このとき、フレキシブルケーブル２２ａと配線ケーブル２５ｂの長さは、制御基板２６を前方ハウジング２１内に収容した位置まで確保しておけばよく、電気接続部を短くして軽量化と省スペース化を図ることができる。 As a result, as shown in FIG. 3, after the image forming portion (transmissive liquid crystal panel 22, lens portion 23, spacer portion 24 and lighting substrate 25) is attached to the front housing 21 in advance, the control board 26 is attached to the front housing 21. The flexible cable 22a and the wiring cable 25b can be pulled out from the mounting and notch 26a to the back surface side. Further, the tip of the flexible cable 22a pulled out from the notch 26a to the back surface side and the connector portion 25a of the wiring cable 25b are inserted into and fitted into the connector portions 26c and 26b, respectively, by simply moving them in the in-plane direction of the control board 26. It can be made to be easy to assemble. At this time, the lengths of the flexible cable 22a and the wiring cable 25b may be secured up to the position where the control board 26 is housed in the front housing 21, and the electrical connection portion is shortened to reduce the weight and space. be able to.
　一方、画像形成部と制御基板２６との間をフレキシブルケーブル２２ａおよび配線ケーブル２５ｂで接続した後に、画像形成部と制御基板２６を前方ハウジング２１に固定する手順で組み立てを行うことも可能である。しかし、フレキシブルケーブル２２ａおよび配線ケーブル２５ｂで各部が接続されていると、組み立て作業時にケーブルの取り回しが邪魔になり作業効率が低下する。また、各部の固定作業時にフレキシブルケーブル２２ａおよび配線ケーブル２５ｂの接続が緩むことや、各部の相対的位置関係が変化するなどの不具合が発生する可能性がある。 On the other hand, after connecting the image forming unit and the control board 26 with the flexible cable 22a and the wiring cable 25b, it is also possible to assemble by the procedure of fixing the image forming unit and the control board 26 to the front housing 21. However, if each part is connected by the flexible cable 22a and the wiring cable 25b, the cable handling becomes an obstacle during the assembly work, and the work efficiency is lowered. Further, there is a possibility that problems such as loosening of the connection between the flexible cable 22a and the wiring cable 25b and a change in the relative positional relationship of each part may occur during the fixing work of each part.
　しかし上述したように、前方ハウジング２１に予め画像形成部を取り付けた後に制御基板２６を取り付け、切欠部２６ａを介してフレキシブルケーブル２２ａおよび配線ケーブル２５ｂを裏面側に引き出してコネクタ部２６ｃ，２６ｂと接続する手順とすることで、ケーブルの取り回しが容易になり作業効率が向上する。また、画像形成部が取り付けられた後にフレキシブルケーブル２２ａおよび配線ケーブル２５ｂの接続を行うため、接続の緩みや相対的位置関係の変化などの不具合発生を抑制することができる。 However, as described above, after the image forming portion is attached to the front housing 21 in advance, the control board 26 is attached, and the flexible cable 22a and the wiring cable 25b are pulled out to the back surface side via the notch 26a and connected to the connector portions 26c and 26b. This procedure facilitates cable routing and improves work efficiency. Further, since the flexible cable 22a and the wiring cable 25b are connected after the image forming portion is attached, it is possible to suppress the occurrence of problems such as loosening of the connection and change in the relative positional relationship.
　図５は、ＰＧＵ２０の内部における電気的接続を示す模式斜視図である。図５では、前方ハウジング２１および後方ハウジング２７については図示を省略している。図５に示すように、制御基板２６の下方に切欠部２６ａが形成されていることで、フレキシブルケーブル２２ａ、配線ケーブル２５ｂおよびコネクタ部２５ａが切欠部２６ａから裏面側に引き出されている。また、フレキシブルケーブル２２ａの先端とコネクタ部２５ａは、それぞれ切欠部２６ａから上方に向かってコネクタ部２６ｃ，２６ｂに挿入されている。 FIG. 5 is a schematic perspective view showing an electrical connection inside the PGU 20. In FIG. 5, the front housing 21 and the rear housing 27 are not shown. As shown in FIG. 5, since the notch 26a is formed below the control board 26, the flexible cable 22a, the wiring cable 25b, and the connector 25a are pulled out from the notch 26a to the back surface side. Further, the tip of the flexible cable 22a and the connector portion 25a are inserted into the connector portions 26c and 26b upward from the notch portion 26a, respectively.
　上述したようにコネクタ部２６ｃ，２６ｂは、挿入型コネクタであり、挿入方向は制御基板２６の面内方向に沿っている。また、コネクタ部２６ｃ，２６ｂは切欠部２６ａに隣接して配置されており、挿入口は切欠部２６ａ方向を向いている。これにより、制御基板２６の裏面側に引き出されたフレキシブルケーブル２２ａの先端とコネクタ部２５ａをコネクタ部２６ｃ，２６ｂに容易に挿入して接続を確保することができる、また、フレキシブルケーブル２２ａおよび配線ケーブル２５ｂの長さを必要最低限にすることができ、軽量化と省スペース化を図るとともに、作業効率を向上させることができる。 As described above, the connector portions 26c and 26b are insertion type connectors, and the insertion direction is along the in-plane direction of the control board 26. Further, the connector portions 26c and 26b are arranged adjacent to the notch portion 26a, and the insertion port faces the notch portion 26a. As a result, the tip of the flexible cable 22a pulled out to the back surface side of the control board 26 and the connector portion 25a can be easily inserted into the connector portions 26c and 26b to secure the connection, and the flexible cable 22a and the wiring cable can be secured. The length of 25b can be minimized, the weight can be reduced, the space can be saved, and the work efficiency can be improved.
　図６は、ＰＧＵ２０の組み立て状態を示す模式断面図である。図６ではフレキシブルケーブル２２ａ、配線ケーブル２５ｂおよびコネクタ部２５ａの図示は省略している。図６に示したように、前方ハウジング２１の前面には開口部２１ｃが形成されており、開口部２１ｃに対応する位置に透過型液晶パネル２２が隣接して配置されている。透過型液晶パネル２２の背面側にはレンズ部２３が配置されており、レンズ部２３の平板状部材から前方に突出した支持柱が透過型液晶パネル２２の裏面に当接している。図示したように支持柱の高さは上下で異なっており、その先端面も平板状部材に対して傾斜している。したがって、透過型液晶パネル２２の裏面に対して平板状部材は傾斜して配置される。レンズ部２３の背面側にはスペーサー部２４が配置されており、スペーサー部２４の表裏面にそれぞれレンズ部２３と照明基板２５が当接することで、レンズ部２３と照明基板２５の間隔が確保される。 FIG. 6 is a schematic cross-sectional view showing an assembled state of the PGU 20. In FIG. 6, the flexible cable 22a, the wiring cable 25b, and the connector portion 25a are not shown. As shown in FIG. 6, an opening 21c is formed on the front surface of the front housing 21, and the transmissive liquid crystal panel 22 is adjacently arranged at a position corresponding to the opening 21c. The lens portion 23 is arranged on the back surface side of the transmissive liquid crystal panel 22, and the support pillar protruding forward from the flat plate-shaped member of the lens portion 23 is in contact with the back surface of the transmissive liquid crystal panel 22. As shown in the figure, the heights of the support columns are different at the top and bottom, and the tip surface thereof is also inclined with respect to the flat plate-shaped member. Therefore, the flat plate-shaped member is arranged so as to be inclined with respect to the back surface of the transmissive liquid crystal panel 22. A spacer portion 24 is arranged on the back side of the lens portion 23, and the lens portion 23 and the lighting substrate 25 are in contact with each other on the front and back surfaces of the spacer portion 24, so that the distance between the lens portion 23 and the lighting substrate 25 is secured. The lens.
　本実施形態では上述したように、前方ハウジング２１内に透過型液晶パネル２２、レンズ部２３、スペーサー部２４および照明基板２５を取り付けた後に、制御基板２６の取り付けと電気接続部の接続を行う。したがって、はじめに透過型液晶パネル２２、レンズ部２３、スペーサー部２４および照明基板２５の位置決めをして、それぞれの位置関係を確保することで、画像形成部の光学特性を決定できる。その後に、制御基板２６、フレキシブルケーブル２２ａ、配線ケーブル２５ｂおよびコネクタ部２５ａをハンドリングしても、画像形成部の各部は位置決めされているので、光学特性に与える影響を低減できる。 In the present embodiment, as described above, after mounting the transmissive liquid crystal panel 22, the lens section 23, the spacer section 24, and the lighting board 25 in the front housing 21, the control board 26 is mounted and the electrical connection section is connected. Therefore, the optical characteristics of the image forming unit can be determined by first positioning the transmissive liquid crystal panel 22, the lens unit 23, the spacer unit 24, and the lighting substrate 25 to secure their positional relationships. After that, even if the control board 26, the flexible cable 22a, the wiring cable 25b, and the connector portion 25a are handled, each portion of the image forming portion is positioned, so that the influence on the optical characteristics can be reduced.
　図６に示した例では、制御基板２６は位置決めピン２１ｂの先端が前面に当接して、ＰＧＵハウジング内での位置が決められている。また、制御基板２６は前方ハウジング２１内ではなく、後方ハウジング２７内に位置して収容されている。これにより、制御基板２６の前方ハウジング２１への取り付け作業や、フレキシブルケーブル２２ａおよびコネクタ部２５ａの接続作業の際に、前方ハウジング２１から露出した位置での作業ができるため、作業効率が向上する。 In the example shown in FIG. 6, the tip of the positioning pin 21b abuts on the front surface of the control board 26, and the position in the PGU housing is determined. Further, the control board 26 is not housed in the front housing 21 but in the rear housing 27. As a result, when the control board 26 is attached to the front housing 21 and the flexible cable 22a and the connector portion 25a are connected, the work can be performed at a position exposed from the front housing 21, so that the work efficiency is improved.
　また、図６に示したように、制御基板２６の裏面側からは外部コネクタ２６ｄが後方に突出して配置されており、後方ハウジング２７の開口部２７ａに外部コネクタ２６ｄの先端が挿入される。したがって、前方ハウジング２１と後方ハウジング２７を組み合わせてＰＧＵハウジングを構成した状態では、外部コネクタ２６ｄの先端が後方ハウジング２７から露出する。これにより、ＰＧＵ２０の背面側から露出した外部コネクタ２６ｄに対して外部からケーブルを接続することが容易となり、作業効率が向上する。 Further, as shown in FIG. 6, the external connector 26d is arranged so as to project rearward from the back surface side of the control board 26, and the tip of the external connector 26d is inserted into the opening 27a of the rear housing 27. Therefore, in a state where the front housing 21 and the rear housing 27 are combined to form the PGU housing, the tip of the external connector 26d is exposed from the rear housing 27. This makes it easy to connect a cable from the outside to the external connector 26d exposed from the back side of the PGU 20, and the work efficiency is improved.
　上述したように、本実施形態の画像投影装置１００では、制御基板２６の裏面側にコネクタ部２６ｃ，２６ｂが搭載されており、透過型液晶パネル２２および照明基板２５に接続されたフレキシブルケーブル２２ａおよび配線ケーブル２５ｂが、制御基板２６の裏面にまで引き出されコネクタ部２６ｃ，２６ｂに接続されている。制御基板２６の裏面側にコネクタ部２６ｃ，２６ｂが搭載されていることで、制御基板２６の位置決めをした後に電気接続部をコネクタ部２６ｃ，２６ｂに挿入して接続することができ、部品点数を削減するとともに組立作業の効率を改善することが可能となる。 As described above, in the image projection device 100 of the present embodiment, the connector portions 26c and 26b are mounted on the back surface side of the control board 26, and the flexible cable 22a and the flexible cable 22a connected to the transmissive liquid crystal panel 22 and the lighting board 25 are provided. The wiring cable 25b is drawn out to the back surface of the control board 26 and connected to the connector portions 26c and 26b. Since the connector portions 26c and 26b are mounted on the back surface side of the control board 26, the electrical connection portion can be inserted and connected to the connector portions 26c and 26b after positioning the control board 26, and the number of parts can be increased. It is possible to reduce the number and improve the efficiency of assembly work.
　（第２実施形態）
　次に、本発明の第２実施形態について図７、図８を用いて説明する。第１実施形態と重複する内容は説明を省略する。図７は、本実施形態に係る画像投影装置１００における筐体１０への平板ミラー部３０の取り付け作業を示す模式斜視図である。図７に示したように、筐体１０は、ＰＧＵ装着部１１と、棚部１２と、壁面１３と、開口部１４と、上枠部１５と、突起部１６と、スライドガイド１７と、リブ１８と、突起部１９とを備えている。 (Second Embodiment)
Next, the second embodiment of the present invention will be described with reference to FIGS. 7 and 8. The description of the contents overlapping with the first embodiment will be omitted. FIG. 7 is a schematic perspective view showing the work of attaching the flat plate mirror portion 30 to the housing 10 in the image projection device 100 according to the present embodiment. As shown in FIG. 7, the housing 10 includes a PGU mounting portion 11, a shelf portion 12, a wall surface 13, an opening 14, an upper frame portion 15, a protrusion 16, a slide guide 17, and a rib. 18 and a protrusion 19.
　ＰＧＵ装着部１１は、筐体１０の一部に形成された凹部形状であり、ＰＧＵ２０を装着する部分である。ＰＧＵ装着部１１にはＰＧＵ２０の開口部２１ｃに対応する位置に開口部（図示省略）が形成されている。棚部１２は、筐体１０の内部に形成された段差形状であり、壁面１３から内側に向かって突出して水平面が形成されている。壁面１３は、鉛直方向に立設された板状の部分であり、筐体１０の外形を構成している。開口部１４は、壁面１３に設けられた開口であり、その下辺は棚部１２の水平面と一致し、上辺は上枠部１５となっている。 The PGU mounting portion 11 has a concave shape formed in a part of the housing 10, and is a portion for mounting the PGU 20. An opening (not shown) is formed in the PGU mounting portion 11 at a position corresponding to the opening 21c of the PGU 20. The shelf portion 12 has a stepped shape formed inside the housing 10, and a horizontal surface is formed so as to project inward from the wall surface 13. The wall surface 13 is a plate-shaped portion erected in the vertical direction, and constitutes the outer shape of the housing 10. The opening 14 is an opening provided on the wall surface 13, the lower side thereof coincides with the horizontal plane of the shelf portion 12, and the upper side is the upper frame portion 15.
　上枠部１５は、壁面１３と一体に形成されて開口部１４の上辺を構成する枠状部分である。突起部１６は、上枠部１５から内側に突出して形成された突起状部分である。スライドガイド１７は、棚部１２の両端に立設された上下方向に断面Ｌ字形状の柱として形成された部分である。スライドガイド１７は壁面１３から内側に突出して形成されているとしてもよい。また、スライドガイド１７の高さは棚部１２の水平面から上枠部１５までの半分程度である。 The upper frame portion 15 is a frame-shaped portion that is integrally formed with the wall surface 13 and constitutes the upper side of the opening 14. The protrusion 16 is a protrusion formed so as to project inward from the upper frame portion 15. The slide guide 17 is a portion formed as a pillar having an L-shaped cross section in the vertical direction erected at both ends of the shelf portion 12. The slide guide 17 may be formed so as to project inward from the wall surface 13. Further, the height of the slide guide 17 is about half from the horizontal plane of the shelf portion 12 to the upper frame portion 15.
　リブ１８は、壁面１３から内側に向かって突出して形成されたリブ形状の部分であり、下端の突出量が上端よりも大きく縦方向にテーパ形状とされている。リブ１８が形成される位置は、開口部１４とスライドガイド１７の間であり、スライドガイド１７と同程度の高さで形成されている。突起部１９は、棚部１２の水平面から上方に向かって突出して形成された段差形状である。 The rib 18 is a rib-shaped portion formed so as to project inward from the wall surface 13, and the protrusion amount at the lower end is larger than that at the upper end and is tapered in the vertical direction. The position where the rib 18 is formed is between the opening 14 and the slide guide 17, and is formed at the same height as the slide guide 17. The protrusion 19 has a stepped shape formed so as to project upward from the horizontal plane of the shelf 12.
　図７に示したように、２つのスライドガイド１７の間隔は平板ミラー部３０の横方向と同一であり、上方からスライドガイド１７の内側に平板ミラー部３０を摺動させて挿入する。平板ミラー部３０は、下端が突起部１９に当接して支持されるとともに、両側辺はスライドガイド１７に当接して支持される。また、平板ミラー部３０の壁面１３と対向する面はリブ１８に当接して支持され、ＰＧＵ２０と対向する面はスライドガイド１７の一辺に当接して支持される。また、平板ミラー部３０の上端には突起部１６の下面が当接する。 As shown in FIG. 7, the distance between the two slide guides 17 is the same as the lateral direction of the flat plate mirror portion 30, and the flat plate mirror portion 30 is slid and inserted into the slide guide 17 from above. The lower end of the flat plate mirror portion 30 abuts on the protrusion 19 and is supported, and both sides thereof abut and are supported by the slide guide 17. Further, the surface of the flat plate mirror portion 30 facing the wall surface 13 is in contact with the rib 18 and supported, and the surface facing the PGU 20 is in contact with one side of the slide guide 17 and supported. Further, the lower surface of the protrusion 16 comes into contact with the upper end of the flat plate mirror portion 30.
　したがって、平板ミラー部３０は、左右方向への移動がスライドガイド１７で規制され、上下方向への移動が突起部１６と突起部１９で規制され、内外方向への移動がスライドガイド１７とリブ１８で規制されて保持される。 Therefore, in the flat plate mirror portion 30, the movement in the left-right direction is restricted by the slide guide 17, the movement in the vertical direction is restricted by the protrusion 16 and the protrusion 19, and the movement in the inward / outward direction is restricted by the slide guide 17 and the rib 18. Regulated and retained in.
　図８は、筐体１０への平板ミラー部３０の位置決めおよび保持構造を示す模式断面図である。リブ１８が上下方向にテーパ形状とされているため、平板ミラー部３０をスライドガイド１７に沿って挿入することが容易となる。また、突起部１９の上端位置において、スライドガイド１７とリブ１８との内外方向（図中左右方向）の間隔は平板ミラー部３０の厚さと同一である。したがって、平板ミラー部３０を挿入した状態では内外方向への平板ミラー部３０の位置が正確に定まる。 FIG. 8 is a schematic cross-sectional view showing the positioning and holding structure of the flat plate mirror portion 30 on the housing 10. Since the rib 18 has a tapered shape in the vertical direction, the flat plate mirror portion 30 can be easily inserted along the slide guide 17. Further, at the upper end position of the protrusion 19, the distance between the slide guide 17 and the rib 18 in the inside / outside direction (left-right direction in the figure) is the same as the thickness of the flat plate mirror portion 30. Therefore, in the state where the flat plate mirror portion 30 is inserted, the position of the flat plate mirror portion 30 in the inward and outward directions is accurately determined.
　平板ミラー部３０の上端に当接する突起部１６は、上枠部１５に形成されているため、上枠部１５を細く形成することで適度な弾性率をもたせ、平板ミラー部３０の挿入動作時に上枠部１５を弾性変形させることができる。これにより、平板ミラー部３０の挿入動作を円滑に行うとともに、平板ミラー部３０の変形や破損を防止することができる。図８では突起部１６として上枠部１５から内側方向に突出した形状を示したが、さらに突起部１６の内側先端に下方に伸びる爪を形成し、平板ミラー部３０の内側面に当接させるとしてもよい。この場合、平板ミラー部３０上端の内外方向への移動を規制し、平板ミラー部３０の倒れ込みを防止することができる。 Since the protrusion 16 that abuts on the upper end of the flat plate mirror portion 30 is formed on the upper frame portion 15, the upper frame portion 15 is formed thin to give an appropriate elastic modulus, and during the insertion operation of the flat plate mirror portion 30. The upper frame portion 15 can be elastically deformed. As a result, the flat plate mirror portion 30 can be smoothly inserted and the flat plate mirror portion 30 can be prevented from being deformed or damaged. In FIG. 8, the shape of the protrusion 16 protruding inward from the upper frame portion 15 is shown, but a claw extending downward is further formed at the inner tip of the protrusion 16 so as to abut on the inner surface of the flat plate mirror portion 30. May be. In this case, it is possible to restrict the movement of the upper end of the flat plate mirror portion 30 in the inward and outward directions and prevent the flat plate mirror portion 30 from collapsing.
　上述したように、本実施形態の画像投影装置１００では、筐体１０に形成されたスライドガイド１７と、筐体１０の壁面１３と、突起部１６，１９によって平板ミラー部３０を位置決めし保持している。これにより、部品点数を削減するとともに組立作業の効率を改善することが可能となる。 As described above, in the image projection device 100 of the present embodiment, the flat plate mirror portion 30 is positioned and held by the slide guide 17 formed on the housing 10, the wall surface 13 of the housing 10, and the protrusions 16 and 19. ing. This makes it possible to reduce the number of parts and improve the efficiency of assembly work.
　本発明は上述した各実施形態に限定されるものではなく、請求項に示した範囲で種々の変更が可能であり、異なる実施形態にそれぞれ開示された技術的手段を適宜組み合わせて得られる実施形態についても本発明の技術的範囲に含まれる。 The present invention is not limited to the above-described embodiments, and various modifications can be made within the scope of the claims, and the embodiments obtained by appropriately combining the technical means disclosed in the different embodiments. Is also included in the technical scope of the present invention.
　本国際出願は、２０２０年８月２６日に出願された日本国特許出願である特願２０２０－１４２３５４号に基づく優先権を主張するものであり、当該日本国特許出願である特願２０２０－１４２３５４号の全内容は、本国際出願に援用される。 This international application claims priority based on Japanese Patent Application No. 2020-142354 filed on August 26, 2020, and Japanese Patent Application No. 2020-142354. The entire contents of the issue will be incorporated into this international application.
　本発明の特定の実施の形態についての上記説明は、例示を目的として提示したものである。それらは、網羅的であったり、記載した形態そのままに本発明を制限したりすることを意図したものではない。数多くの変形や変更が、上記の記載内容に照らして可能であることは当業者に自明である。 The above description of the specific embodiment of the present invention is presented for the purpose of illustration. They are not intended to be exhaustive or to limit the invention as it is described. It is self-evident to those skilled in the art that numerous modifications and changes are possible in the light of the above description.
１００…画像投影装置
１０…筐体
２０…ＰＧＵ
３０…平板ミラー部
４０…拡大ミラー部
５０…天板部
６０…透光カバー
１１…ＰＧＵ装着部
１２…棚部
１３…壁面
１４…開口部
１５…上枠部
１６，１９…突起部
１７…スライドガイド
１８…リブ
２１…前方ハウジング
２１ａ…固定部
２１ｂ…位置決めピン
２１ｃ…開口部
２２…透過型液晶パネル
２２ａ…フレキシブルケーブル
２３…レンズ部
２４…スペーサー部
２５…照明基板
２５ａ…コネクタ部
２５ｂ…配線ケーブル
２５ｃ…ＬＥＤ
２６…制御基板
２６ａ…切欠部
２６ｂ、２６ｃ…コネクタ部
２６ｄ…外部コネクタ
２６ｅ…貫通孔
２７…後方ハウジング
２７ａ…開口部
２７ｂ…締結孔
２８…締結部材 100 ... Image projection device 10 ... Housing 20 ... PGU
30 ... Flat mirror part 40 ... Enlarged mirror part 50 ... Top plate part 60 ... Translucent cover 11 ... PGU mounting part 12 ... Shelf part 13 ... Wall surface 14 ... Opening part 15 ... Upper frame part 16, 19 ... Projection part 17 ... Slide Guide 18 ... Rib 21 ... Front housing 21a ... Fixed part 21b ... Positioning pin 21c ... Opening 22 ... Transmissive liquid crystal panel 22a ... Flexible cable 23 ... Lens part 24 ... Spacer part 25 ... Lighting board 25a ... Connector part 25b ... Wiring cable 25c ... LED
26 ... Control board 26a ... Notch 26b, 26c ... Connector part 26d ... External connector 26e ... Through hole 27 ... Rear housing 27a ... Opening 27b ... Fastening hole 28 ... Fastening member

Claims (8)

  1. 　画像信号に応じた画像を照射する画像形成部と、
    　前記画像形成部を駆動制御する制御部が搭載された制御基板と、
    　一端が前記画像形成部と電気的に接続され、他端が前記制御基板と電気的に接続された電気接続部とを有し、
    　前記制御基板には、前記画像形成部に対向する面とは反対である裏面側にコネクタ部が搭載されており、前記電気接続部の前記他端は前記コネクタ部に接続されていることを特徴とする画像投影装置。     An image forming unit that irradiates an image according to an image signal,
    A control board on which a control unit that drives and controls the image forming unit is mounted, and
    One end has an electrical connection that is electrically connected to the image forming unit and the other end is electrically connected to the control board.
    The control board is characterized in that a connector portion is mounted on the back surface side opposite to the surface facing the image forming portion, and the other end of the electrical connection portion is connected to the connector portion. Image projection device.
  2. 　請求項１に記載の画像投影装置であって、
    　前記画像形成部は、透過型液晶パネルと、前記透過型液晶パネルの背面側に配置された照明基板とを備え、
    　前記電気接続部は、前記透過型液晶パネルと前記制御基板とを電気的に接続するフレキシブルケーブルと、前記照明基板と前記制御基板とを電気的に接続する配線ケーブルを備えることを特徴とする画像投影装置。     The image projection device according to claim 1.
    The image forming unit includes a transmissive liquid crystal panel and a lighting substrate arranged on the back side of the transmissive liquid crystal panel.
    The image is characterized in that the electrical connection portion includes a flexible cable that electrically connects the transmissive liquid crystal panel and the control board, and a wiring cable that electrically connects the lighting board and the control board. Projector.
  3. 　請求項１または２に記載の画像投影装置であって、
    　前記コネクタ部は挿入型コネクタであり、前記電気接続部の前記他端を前記制御基板の面内方向に沿って挿入するものであることを特徴とする画像投影装置。     The image projection device according to claim 1 or 2.
    The connector portion is an insertion type connector, and the image projection device is characterized in that the other end of the electrical connection portion is inserted along the in-plane direction of the control board.
  4. 　請求項１から３の何れか一つに記載の画像投影装置であって、
    　前記制御基板には、周縁部の一部が切り欠かれた切欠部が形成されており、
    　前記電気接続部は、前記切欠部を介して前記画像形成部側から前記裏面側に引き出されていることを特徴とする画像投影装置。     The image projection device according to any one of claims 1 to 3.
    The control board is formed with a notch in which a part of the peripheral edge is cut out.
    The image projection device, characterized in that the electrical connection portion is pulled out from the image forming portion side to the back surface side via the notch portion.
  5. 　請求項１から４の何れか一つに記載の画像投影装置であって、
    　前記画像形成部および前記制御基板を収容するＰＧＵハウジングを有し、
    　前記画像形成部および前記制御基板は、前記ＰＧＵハウジングに対して一括して締結部材で固定されていることを特徴とする画像投影装置。     The image projection device according to any one of claims 1 to 4.
    It has a PGU housing that houses the image forming unit and the control board, and has.
    An image projection device, wherein the image forming unit and the control substrate are collectively fixed to the PGU housing by fastening members.
  6. 　請求項５に記載の画像投影装置であって、
    　前記ＰＧＵハウジングは、前記画像形成部の画像照射方向に配置された前方ハウジングと、前記制御基板の裏面側に配置された後方ハウジングとを備え、
    　前記制御基板の裏面側には、外部と電気的に接続される外部コネクタが搭載されており、
    　前記後方ハウジングには、前記外部コネクタと対応する位置に開口部が形成され、前記開口部に前記外部コネクタの先端が挿入されていることを特徴とする画像投影装置。     The image projection device according to claim 5.
    The PGU housing includes a front housing arranged in the image irradiation direction of the image forming portion and a rear housing arranged on the back surface side of the control board.
    An external connector that is electrically connected to the outside is mounted on the back surface side of the control board.
    An image projection device characterized in that an opening is formed in the rear housing at a position corresponding to the external connector, and the tip of the external connector is inserted into the opening.
  7. 　請求項１から６の何れか一つに記載の画像投影装置であって、
    　前記画像形成部から照射された光を反射する平板状の平板ミラー部を備え、
    　前記平板ミラー部は、筐体に形成されたスライドガイドと、前記筐体の壁面と、前記筐体に形成された突起部によって位置決めされ保持されていることを特徴とする画像投影装置。     The image projection device according to any one of claims 1 to 6.
    A flat plate-shaped mirror portion that reflects the light emitted from the image forming portion is provided.
    The flat plate mirror portion is an image projection device characterized in that it is positioned and held by a slide guide formed in a housing, a wall surface of the housing, and a protrusion formed in the housing.
  8. 　請求項７に記載の画像投影装置であって、
    　前記スライドガイドは、前記平板ミラー部の水平方向における両端に設けられており、　前記突起部は、前記平板ミラー部の上下方向における両端に設けられていることを特徴とする画像投影装置。     The image projection device according to claim 7.
    The image projection device is characterized in that the slide guides are provided at both ends of the flat plate mirror portion in the horizontal direction, and the protrusions are provided at both ends of the flat plate mirror portion in the vertical direction.
PCT/JP2021/030743 2020-08-26 2021-08-23 Image projection device WO2022045048A1 (en)

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