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JP-7856136-B2 - Circuit board units and electronic devices

JP7856136B2JP 7856136 B2JP7856136 B2JP 7856136B2JP-7856136-B2

Inventors

  • 真砂 裕
  • 大森 俊之
  • 伊藤 正明
  • 平井 健

Assignees

  • セイコーエプソン株式会社

Dates

Publication Date
20260511
Application Date
20241224

Claims (18)

  1. A first circuit board having a first ground layer, A second circuit board having a second ground layer and positioned opposite the first circuit board, A connector unit having a first connector attached to the first circuit board and a second connector attached to the second circuit board and connected to the first connector, A metal member disposed between the first circuit board and the second circuit board, electrically connecting the first ground layer and the second ground layer, A metal bolt connecting the second circuit board and the metal member, Equipped with, The metal members are arranged adjacent to the connector unit, The distance between the metal member and the connector unit is 20 mm or less. Viewed in the connection direction in which the first connector and the second connector are connected, the connector unit has a shape that is elongated in a predetermined direction. The metal members are arranged adjacent to each other in the predetermined direction relative to the connector unit. The first circuit board has a plurality of signal lines formed thereon, which are arranged in the predetermined direction and electrically connected to the first connector. The plurality of signal lines include a first signal line and a second signal line through which a signal with a higher frequency than the signal flowing through the first signal line flows. The circuit board unit is characterized in that the second signal line is positioned closer to the metal member than the first signal line in the predetermined direction .
  2. A first circuit board having a first ground layer, A second circuit board having a second ground layer and positioned opposite the first circuit board, A connector unit having a first connector attached to the first circuit board and a second connector attached to the second circuit board and connected to the first connector, A metal member disposed between the first circuit board and the second circuit board, electrically connecting the first ground layer and the second ground layer, A metal bolt connecting the second circuit board and the metal member, Equipped with, The metal members are arranged adjacent to the connector unit, The distance between the metal member and the connector unit is 20 mm or less. Viewed in the connection direction in which the first connector and the second connector are connected, the connector unit has a shape that is elongated in a predetermined direction. The metal members are arranged adjacent to each other in an orthogonal direction perpendicular to the predetermined direction with respect to the connector unit. The first circuit board has a plurality of signal lines formed thereon, which are arranged in the predetermined direction and electrically connected to the first connector. The plurality of signal lines include a first signal line and a second signal line through which a signal with a higher frequency than the signal flowing through the first signal line flows. The plurality of signal lines are arranged in the direction perpendicular to the connector unit. The metal member is positioned on the opposite side of the connector unit from the plurality of signal lines. The circuit board unit is characterized in that the position of the metal member in the predetermined direction includes the position of the second signal line in the predetermined direction.
  3. A first circuit board having a first ground layer, A second circuit board having a second ground layer and positioned opposite the first circuit board, A connector unit having a first connector attached to the first circuit board and a second connector attached to the second circuit board and connected to the first connector, A metal member disposed between the first circuit board and the second circuit board, electrically connecting the first ground layer and the second ground layer, A metal bolt connecting the second circuit board and the metal member, Equipped with, The metal members are arranged adjacent to the connector unit, The distance between the metal member and the connector unit is 20 mm or less. The first circuit board has a pair of first ground layers provided in different layers from each other. The pair of first ground layers are electrically connected to each other. The first circuit board has through holes formed therein. A metal bolt is passed through the aforementioned through hole. The aforementioned bolt is The bolt body portion is passed through the through hole and fastened to the metal member, A bolt head provided at one end of the bolt body, It has, The metal member contacts one of the pair of first ground layers on the surface of the first circuit board facing the second circuit board. The circuit board unit is characterized in that the bolt head is in contact with the other of the pair of first ground layers on the surface of the first circuit board opposite to the surface facing the second circuit board.
  4. A first circuit board having a first ground layer, A second circuit board having a second ground layer and positioned opposite the first circuit board, A connector unit having a first connector attached to the first circuit board and a second connector attached to the second circuit board and connected to the first connector, A metal member disposed between the first circuit board and the second circuit board, electrically connecting the first ground layer and the second ground layer, A metal bolt connecting the second circuit board and the metal member, Elastically deformable conductive member, Equipped with, The metal members are arranged adjacent to the connector unit, The distance between the metal member and the connector unit is 20 mm or less. The conductive member is in contact with the first ground layer, The circuit board unit is characterized in that the metal member is electrically connected to the first ground layer via the conductive member.
  5. The circuit board unit according to claim 1, wherein the distance between the metal member and the connector unit is less than 10 mm.
  6. Viewed in the connection direction in which the first connector and the second connector are connected, the connector unit has a shape that is elongated in a predetermined direction. The circuit board unit according to claim 3 , wherein the metal members are arranged adjacent to the connector unit in the predetermined direction.
  7. The first circuit board has a plurality of signal lines formed thereon, which are arranged in the predetermined direction and electrically connected to the first connector. The plurality of signal lines include a first signal line and a second signal line through which a signal with a higher frequency than the signal flowing through the first signal line flows. The circuit board unit according to claim 6 , wherein the second signal line is positioned closer to the metal member than the first signal line in the predetermined direction.
  8. Viewed in the connection direction in which the first connector and the second connector are connected, the connector unit has a shape that is elongated in a predetermined direction. The circuit board unit according to claim 3 , wherein the metal members are arranged adjacent to the connector unit in an orthogonal direction perpendicular to the predetermined direction.
  9. The first circuit board has a plurality of signal lines formed thereon, which are arranged in the predetermined direction and electrically connected to the first connector. The plurality of signal lines include a first signal line and a second signal line through which a signal with a higher frequency than the signal flowing through the first signal line flows. The plurality of signal lines are arranged in the direction perpendicular to the connector unit. The metal member is positioned on the opposite side of the connector unit from the plurality of signal lines. The circuit board unit according to claim 8 , wherein the position of the metal member in the predetermined direction includes the position of the second signal line in the predetermined direction.
  10. The aforementioned metal member is A first connection surface extending along the first ground layer and electrically connected to the first ground layer, A second connection surface extending along the second ground layer and electrically connected to the second ground layer, A circuit board unit according to any one of claims 1 to 9 , having the following features.
  11. The aforementioned metal member is A main body portion extending in the connection direction to which the first connector and the second connector are connected, A first connecting portion having the first connecting surface and protruding from one end of the main body in the connecting direction, The second connecting portion has the second connecting surface and protrudes from the other end of the main body in the connection direction in a direction different from the direction in which the first connecting portion protrudes, It has, The circuit board unit according to claim 10 , wherein the main body is plate-shaped and its side is positioned opposite the connector unit.
  12. The aforementioned metal member is A main body portion extending in the connection direction to which the first connector and the second connector are connected, Having the first connection surface, the first connection portion protrudes from one end of the main body in the connection direction toward the connector unit, The second connecting portion has the aforementioned second connecting surface and protrudes from the other end of the main body in the connection direction in the same direction as the protruding first connecting portion, It has, The circuit board unit according to claim 10 , wherein the main body is plate-shaped and its plate surface is positioned opposite the connector unit.
  13. The metal member has a columnar main body portion that extends in the connection direction in which the first connector and the second connector are connected. The circuit board unit according to any one of claims 1 to 9 , wherein the main body is arranged opposite to the connector unit.
  14. The first circuit board has a pair of first ground layers provided in different layers from each other. The circuit board unit according to any one of claims 1 , 2, and 4 to 9 , wherein the pair of first ground layers are electrically connected to each other.
  15. The first circuit board has through holes formed therein. A metal bolt is passed through the aforementioned through hole. The aforementioned bolt is The bolt body portion is passed through the through hole and fastened to the metal member, A bolt head provided at one end of the bolt body, It has, The metal member contacts one of the pair of first ground layers on the surface of the first circuit board facing the second circuit board. The circuit board unit according to claim 14 , wherein the bolt head is in contact with the other of the pair of first ground layers on the surface of the first circuit board opposite to the surface facing the second circuit board.
  16. The circuit board unit according to claim 15 , wherein the metal member has an engaging claw portion inserted into an engaging hole formed in the first circuit board.
  17. Equipped with an elastically deformable conductive member, The conductive member is in contact with the first ground layer, The circuit board unit according to any one of claims 1 , 2, 3, and 5 to 9 , wherein the metal member is electrically connected to the first ground layer via the conductive member.
  18. An electronic device comprising a circuit board unit according to any one of claims 1 to 9 .

Description

This disclosure relates to circuit board units and electronic devices. For example, an inter-board connector for connecting circuit boards, such as the one described in Patent Document 1, is known. Japanese Patent Publication No. 2018-207019 This is a schematic diagram showing a projector according to the first embodiment.This is a cross-sectional view showing a part of the circuit board unit of the first embodiment.This is a cross-sectional view showing a part of the circuit board unit of the first embodiment, and it shows a different cross-section from that shown in Figure 2.This is a plan view showing a part of the circuit board unit of the first embodiment.This is a perspective view showing a part of the circuit board unit of the first embodiment.This is a side view showing a part of the circuit board unit of the first embodiment.This is a cross-sectional view showing a part of the circuit board unit of the second embodiment.This is a perspective view showing a part of the circuit board unit of the second embodiment.This is a cross-sectional view showing a part of the circuit board unit of the third embodiment.This is a perspective view showing a part of the circuit board unit of the third embodiment.This is a perspective view showing a part of the circuit board unit of the fourth embodiment.This is a plan view showing a part of the circuit board unit of the fourth embodiment. The embodiments of this disclosure will be described below with reference to the drawings. In the following embodiments, a projector will be used as an example of an electronic device. The scope of this disclosure is not limited to the embodiments described below, and can be modified at will within the scope of the technical concept of this disclosure. Furthermore, in the following drawings, the scale and number of components in each structure may differ from the actual structure in order to make the configurations easier to understand. <First Embodiment> Figure 1 is a schematic diagram showing the projector 1 as an electronic device in this embodiment. The projector 1 of this embodiment is a projection-type image display device that projects a color image onto a screen SCR. As shown in Figure 1, the projector 1 comprises a light source device 2, a uniform illumination optical system 40, a color separation optical system 3, an optical modulator 4R, an optical modulator 4G, an optical modulator 4B, a composite optical system 5, a projection optical system 6, and a control device 50. The light source device 2 emits illumination light WL toward the uniform illumination optical system 40. The uniform illumination optical system 40 comprises an integrator optical system 31, a polarization conversion element 32, and a superposition optical system 33. The integrator optical system 31 comprises a first lens array 31a and a second lens array 31b. The uniform illumination optical system 40 homogenizes the intensity distribution of the illumination light WL emitted from the light source device 2 in the illuminated regions of the light modulators 4R, 4G, and 4B. The illumination light WL emitted from the uniform illumination optical system 40 is incident on the color separation optical system 3. The color separation optical system 3 separates white illumination light WL into red light LR, green light LG, and blue light LB. The color separation optical system 3 comprises a first dichroic mirror 7a, a second dichroic mirror 7b, a first reflective mirror 8a, a second reflective mirror 8b, a third reflective mirror 8c, a first relay lens 9a, and a second relay lens 9b. The first dichroic mirror 7a separates the illumination light WL from the light source device 2 into red light LR and other light, namely green light LG and blue light LB. The first dichroic mirror 7a transmits the separated red light LR while reflecting the other light, namely green light LG and blue light LB. On the other hand, the second dichroic mirror 7b separates the other light into green light LG and blue light LB. The second dichroic mirror 7b reflects the separated green light LG and transmits the blue light LB. The first reflective mirror 8a is positioned in the optical path of red light LR and reflects the red light LR that has passed through the first dichroic mirror 7a toward the optical modulator 4R. Meanwhile, the second reflective mirror 8b and the third reflective mirror 8c are positioned in the optical path of blue light LB and reflect the blue light LB that has passed through the second dichroic mirror 7b toward the optical modulator 4B. Furthermore, the green light LG is reflected toward the optical modulator 4G by the second dichroic mirror 7b. The first relay lens 9a and the second relay lens 9b are positioned on the light-emitting side of the second dichroic mirror 7b in the optical path of the blue light LB. The first relay lens 9a and the second relay lens 9b correct for differences in the illumination distribution of the blue light LB caused by the blue l