JP2018116866A - Electronic apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an electronic apparatus comprising an operation substrate capable of ensuring an excellent air bend function without increasing the number of components and without exposing an air release hole on a surface of a sheet material.SOLUTION: An electronic apparatus comprises an operation substrate 30 including: a substrate 31 including a first wiring part 40 and a second wiring part 41; a conductive dome-shaped elastic member 45 which is disposed at a position corresponding to the first wiring part 40 and the second wiring part 41; and an insulative sheet material 50 which is pasted to the substrate 31 while covering the elastic member 45 together with the first wiring part 40 and the second wiring part 41. The elastic member 45 is elastically deformed, such that the first wiring part 40 and the second wiring part 41 are electrically connected via the elastic member 45. An insulation layer 35 including a first opening 37 that is formed in a region of the first wiring part 40 and the second wiring part 41 and a second opening 36 that is connected to the first opening 37 is provided on the substrate 31.SELECTED DRAWING: Figure 4

Description

  The present invention relates to an electronic apparatus including an imaging device such as a digital camera, and more particularly to an electronic apparatus having an operation board such as a metal dome switch.

  In an electronic device such as a digital camera, a metal dome switch is used to detect a pressing operation of an operation button. The metal dome switch is, for example, a switch in which a conductive metal dome is disposed at a substantially central portion between two electrode portions formed on a substrate, and the two electrode portions are made conductive by deformation of the metal dome. The metal dome is bonded and held on the back surface side of the non-conductive sheet material by an adhesive layer, and is bonded and fixed to the substrate together with the sheet material while being covered with the sheet material.

  In a state where the metal dome is sealed by the covering of the sheet material, a repulsive force due to the compression of air in the metal dome is generated when the metal dome switch is pressed. Therefore, in order to obtain a good pressing feeling of the power button and the operating button, a means for releasing the air in the metal dome during the pressing operation is required.

  As a known metal dome switch, there is a so-called single layer type in which a metal dome is bonded and held on a sheet material, and an air escape hole is formed on the surface of the metal dome peripheral portion of the sheet material. In the single-layer type, since air escape holes are formed on the surface of the sheet material, there is a concern that foreign matters such as dust enter from the air escape holes and cause poor conduction between the metal dome and the electrode part.

  On the other hand, there is a so-called two-layer type metal dome switch that does not form an air escape hole on the surface of the sheet material. This is a system in which a metal dome is bonded and held on a sheet material, and a spacer sheet is formed between the electrode portion substrate and the sheet material. The spacer sheet has a configuration in which the metal domes are removed, and further, air bends are formed by removing portions between the metal domes or the outer end of the sheet material. Thereby, air can be escaped without forming an air escape hole on the surface of the sheet material.

  However, the two-layer type metal dome switch increases the number of parts and increases the cost. In the technique described in Patent Document 1, a panel switch is disclosed in which a metal dome is disposed on a sheet material, and an adhesive layer removing portion is provided between the metal domes to form an air escape portion.

JP 2002-367477 A

  However, in the technique disclosed in Patent Document 1, the boundary between the adhesive layer portion and the adhesive layer removal portion causes movement of air every time the metal dome switch is pressed. There are concerns. Further, since the air bend cannot be formed in the thickness direction of the sheet material, it is difficult to ensure the function as the air bend.

  Therefore, the present invention provides an electronic apparatus having an operation board that can ensure a good air bend function without increasing the number of components and without exposing an air escape hole on the surface of a sheet material. For the purpose.

  In order to achieve the above object, the present invention provides a substrate having a first wiring portion and a second wiring portion, and a conductive material disposed at a position corresponding to the first wiring portion and the second wiring portion. An operation board comprising: a dome-shaped elastic member having an insulating sheet; and an insulating sheet material attached to the substrate in a state where the elastic member is covered together with the first wiring portion and the second wiring portion. And an electronic device in which the first wiring portion and the second wiring portion are electrically connected via the elastic member by elastically deforming the elastic member, and the substrate includes And an insulating layer having a first opening formed in a region of the first wiring portion and the second wiring portion and a second opening connected to the first opening. It is characterized by being.

  In order to achieve the above object, the present invention is arranged at a position corresponding to the substrate having the first wiring portion and the second wiring portion, and the first wiring portion and the second wiring portion. A conductive dome-shaped elastic member, and an insulating sheet material attached to the substrate in a state of covering the elastic member together with the first wiring portion and the second wiring portion. An electronic device comprising an operation board and elastically deforming the elastic member to electrically connect the first wiring part and the second wiring part via the elastic member, On the substrate, a first non-printing region provided in a region of the first wiring unit and the second wiring unit, a second non-printing region connected to the first non-printing region, A printing layer having the above is provided.

  According to the present invention, there is provided an electronic apparatus having an operation board capable of ensuring a good air bend function without increasing the number of components and without exposing an air escape hole on the surface of a sheet material. be able to.

(A) is the perspective view which looked at the digital camera which concerns on 1st Embodiment of the electronic device of this invention from the front side, (b) is the perspective view which looked at the digital camera shown to (a) from the back side. FIG. 2 is an exploded perspective view of the digital camera shown in FIG. It is a disassembled perspective view of a metal dome switch. (A) is a figure which shows a metal dome sheet, (b) is a figure which shows a board | substrate, (c) is a figure which shows the state which affixed the metal dome sheet | seat on the board | substrate, (d) is the AA line of (c). It is sectional drawing. It is a figure explaining the metal dome switch in the digital camera which concerns on 2nd Embodiment of the electronic device of this invention. It is a figure explaining the metal dome switch in the digital camera which concerns on 3rd Embodiment of the electronic device of this invention. It is a figure explaining the metal dome switch in the digital camera which concerns on 4th Embodiment of the electronic device of this invention.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

(First embodiment)
FIG. 1A is a perspective view of the digital camera according to the first embodiment of the electronic apparatus of the present invention viewed from the front side (subject side), and FIG. 1B is the digital camera shown in FIG. It is the perspective view seen from the back side. In the present embodiment, a compact digital camera, which is an example of an imaging apparatus, is illustrated as an electronic device, but the present invention is not limited to this.

  As shown in FIG. 1, a digital camera 1 (hereinafter referred to as a camera 1) of the present embodiment is provided with a retractable lens unit 2 on the front side. A flash unit 3, a release button 4, a zoom lever 5, a power button 6, a playback button 10, a microphone hole 7, a mode setting dial 8, and the like are provided on the upper surface of the camera 1. A display unit 15 composed of an LCD or the like is provided on the back surface of the camera 1, and an operation button unit 12 is provided on the right side of the display unit 15 in FIG.

  FIG. 2 is an exploded perspective view of the camera 1 shown in FIG. As shown in FIG. 2, the operation button unit 12 includes an operation button member 17 and a metal dome switch 30. The metal dome switch 30 corresponds to an example of the operation board of the present invention. The metal dome switch 30 is fixed to the chassis member 22 in the camera 1 with a double-sided tape or the like, and the operation button member 17 is fixed to the rear cover 20 of the camera 1 via an adhesive or the like.

  The metal dome switch 30 includes a metal dome sheet 50 having a plurality of (three in the figure) button portions 55, and when detecting that the button portions 55 are pressed, the detection signal is transmitted to the main board 25. Then, a predetermined operation is performed.

  The operation button member 17 is formed by molding a resin material or the like, and has three pressing portions 17 a corresponding to the three button portions 55 of the metal dome sheet 50. The pressing portion 17a is exposed to the outside through a hole portion 20a formed in the rear cover 20, so that a pressing operation by the user is possible.

  FIG. 3 is an exploded perspective view of the metal dome switch 30. As shown in FIG. 3, the metal dome switch 30 is configured by attaching a metal dome sheet 50 together with a metal dome 45 on a substrate 31. The substrate 31 is formed of a single-sided flexible substrate having flexibility, and a wiring pattern made of copper foil is sandwiched between a base film using a film such as an insulating polyimide film and a coverlay film, and a thermosetting adhesive It has a structure bonded with an agent.

  In addition, since the wiring pattern is formed only on one side of the single-sided flexible substrate, the degree of freedom of wiring is limited, but there is an advantage that the manufacturing cost is lower than that of the multilayer flexible substrate. In the present embodiment, the single-sided flexible substrate is formed by using a base film with a thickness of 25 μm (1 mil), a coverlay film with a thickness of 25 μm (1 mil), and a copper foil with a thickness of 18 μm (1/2 oz).

  The metal dome sheet 50 is formed of an insulating sheet material such as a PET (polyethylene terephthalate) film, and the surface on the substrate 31 side has an adhesive layer made of an adhesive sheet or the like. The metal dome 45 is a conductive dome-shaped elastic member made of metal or the like, and is provided with three corresponding to the position and number of the button portions 55, and the metal dome 45 is respectively attached to the metal dome sheet 50 via an adhesive layer. Are fixed by bonding.

  On the other hand, three first switch wiring portions 40 and two second switch wiring portions 41 are attached to the substrate 31 corresponding to the positions and the number of metal domes 45, respectively. The first switch wiring unit 40 is disposed on the outer peripheral side. The first switch wiring portion 40 corresponds to an example of the first wiring portion of the present invention, and the second switch wiring portion 41 corresponds to an example of the second wiring portion of the present invention.

  The first switch wiring part 40 and the second switch wiring part 41 are wiring patterns made of copper foil, and the surface thereof is gold plated. Further, the first switch wiring unit 40 is a signal pattern, and the second switch wiring unit 41 is a GND pattern. The second switch wiring portion 41 is always in contact with and electrically connected to the peripheral edge of the metal dome 45, but the first switch wiring portion 40 is not in contact with the metal dome 45.

  When the pressing portion 17a of the operation button member 17 is pressed and the metal dome 45 is pressed, the metal dome 45 is elastically deformed so that the center portion of the dome shape is reversed, and the first switch wiring portion 40 is turned. Contact with. As a result, the first switch wiring section 40 and the second switch wiring section 41 are conducted through the metal dome 45.

  Here, the first switch wiring portion 40 and the second switch wiring portion 41 are electrically connected to the main substrate 25 via the terminal portions 32 of the substrate 31. For this reason, a control circuit (not shown) of the main board 25 detects that the metal dome 45 is pressed by detecting conduction between the first switch wiring unit 40 and the second switch wiring unit 41. Can do.

  4A is a view showing the metal dome sheet 50, FIG. 4B is a view showing the substrate 31, FIG. 4C is a view showing a state where the metal dome sheet 50 is attached to the substrate 31, and FIG. (D) is the sectional view on the AA line of FIG.4 (c).

  As described above, the first switch wiring portion 40 and the second switch wiring portion 41 are formed corresponding to the number of metal domes 45 on the substrate 31 to which the metal dome sheet 50 and the three metal domes 45 are attached. (See FIG. 4A and FIG. 4B).

  The substrate 31 is covered with a cover lay film 35. The cover lay film 35 has a first switch wiring section 40 and a second switch wiring section as shown in FIGS. 4B and 4D. A cover lay opening 37 is formed in which the area 41 is an uncovered area. Thereby, the copper foils of the first switch wiring part 40 and the second switch wiring part 41 are exposed from the cover lay opening 37. The cover lay film 35 corresponds to an example of the insulating layer of the present invention, and the cover lay opening 37 corresponds to an example of the first opening of the present invention.

  Further, the cover lay film 35 is formed with an air bend opening 36 that connects the center cover lay opening 37 and the upper and lower cover lay openings 37 in FIG. Further, the cover lay film 35 has an air bend opening 36c reaching from the second switch wiring portion 41 of the upper cover lay opening 37 in FIG. 4B to one side surface (outer edge portion) in the width direction of the substrate 31. Is formed.

  The air bend openings 36 and 36c are uncovered regions of the cover lay film 35, and the width of each of the air bend openings 36 and 36c is W. As shown in FIGS. 4C and 4D, the metal dome sheet 50 is attached and fixed to the substrate 31 with the positioning holes 51 aligned with the positioning holes 33 of the substrate 31. The air bend openings 36 and 36c correspond to an example of the second opening of the present invention.

  As shown in FIG. 4D, when the substrate 31 and the metal dome sheet 50 are attached and fixed, a gap H corresponding to the thickness of the cover lay film 35 is generated between the substrate 31 and the metal dome sheet 50. . For this reason, when the metal dome 45 is pressed by the pressing operation of the pressing portion 17a of the operation button member 17, the air bend openings 36 and 36c serve as an air path for allowing air to escape. Here, the gap H is smaller than the width W of the air bend openings 36 and 36c.

  For example, when the lower metal dome 45 of the three metal domes 45 in FIG. 4C is pressed, the air inside moves through the air bend opening 36 toward the center metal dome 45. . As shown in FIG. 4D, the air bend opening 36 has a gap H corresponding to the thickness of the cover lay film 35 between the substrate 31 and the metal dome sheet 50. The air can be smoothly escaped. Thereby, the favorable pressing feeling of the pressing part 17a of the operation button member 17 can be obtained.

  As described above, in the present embodiment, the air vent openings 36 and 36 c communicating with the cover lay opening 37 are formed in the cover lay film 35 constituting the substrate 31, so that the space between the substrate 31 and the metal dome sheet 50 is formed. An air vent gap H is provided in the interior space. For this reason, the function of a favorable air bend can be ensured, without increasing the components for air bends separately, and without exposing an air escape hole to the surface of the metal dome sheet 50.

(Second Embodiment)
Next, a digital camera according to a second embodiment of the electronic apparatus of the invention will be described with reference to FIG. 5A is a view showing the metal dome sheet 50, FIG. 5B is a view showing the substrate 31, FIG. 5C is a view showing a state in which the substrate 31 is coated with the resist printing layer 62, FIG. d) is a diagram showing a state in which the metal dome sheet 50 is attached to the substrate 31. FIG. In the present embodiment, portions overlapping with those in the first embodiment will be described using the reference numerals.

  As shown in FIG. 5, three first switch wiring portions 40 and three second switch wiring portions 41 are formed on the substrate 31 as in the first embodiment. Further, the cover lay film 35 that covers the substrate 31 is formed with a cover lay opening 37 in which the regions of the first switch wiring portion 40 and the second switch wiring portion 41 are uncovered regions. As a result, the copper foils of the first switch wiring portion 40 and the second switch wiring portion 41 are exposed from the cover lay opening 37.

  A jumper printing unit 60 is provided on the substrate 31. 5B, among the three second switch wiring portions 41 arranged in the vertical direction, a jumper opening 38a is formed in the signal line of the upper second switch wiring portion 41, and the lower side A jumper opening 38 b is formed in the signal line of the second switch wiring portion 41.

  The jumper printing unit 60 electrically connects the jumper openings 38a and 38b on the surface of the coverlay film 35. The jumper printing unit 60 is a conductive silver paste, and is printed with a thickness of 10 to 50 μm on the substrate 31 in a screen printing process. Since the jumper printing unit 60 is printed on the surface of the coverlay film 35, the jumper printing unit 60 can be conductively connected across signals of other potentials.

  The substrate 31 is provided with a resist printing layer 62 that covers the jumper printing unit 60. The resist printing layer 62 is a layer of thermosetting resist ink having insulating properties, and is printed with a thickness of 10 to 50 μm on the substrate 31 in the screen printing process. The resist printing layer 62 is covered with the jumper printing unit 60, thereby preventing the conductive silver paste of the jumper printing unit 60 from being exposed.

  On the other hand, on the outer peripheral side of the three cover lay openings 37, a first non-printing area that prevents the first switch wiring part 40 and the second switch wiring part 41 from being covered with the resist printing layer 62 is provided. 65 is formed. In FIG. 5C, the resist printing layer 62 is connected between the first non-printing area 65 at the upper side and the center, and is connected between the first non-printing area 65 at the center and the lower side. The non-printing areas 66 are respectively formed.

  Further, the second non-printing region 66c reaching the one side surface (the left side surface in the drawing) in the width direction of the substrate 31 from the second switch wiring part 41 side of the first non-printing region 65 on the upper side in FIG. Is formed. The width of the second non-printing areas 66 and 66c is Y. As shown in FIGS. 5C to 5D, the metal dome sheet 50 is fixed to the substrate 31 with the positioning holes 51 aligned with the positioning holes 33 of the substrate 31.

  FIG. 5E is a cross-sectional view taken along the line DD of FIG. As shown in FIG. 5E, when the metal dome sheet 50 is pasted and fixed to the substrate 31, the second non-printing area 66 is a non-printing area of the resist printing layer 62. A gap G corresponding to the thickness of the resist printing layer 62 is formed between the film 35 and the film 35. The gap G serves as an air path for allowing air to escape when the metal dome 45 is pressed. Here, the gap G has a smaller relationship than the width Y of the second non-printing region 66.

  For example, when the lower metal dome 45 of the three metal domes 45 in FIG. 5D is pressed, the air inside passes through the second non-printing region 66 toward the central metal dome 45. Move. Since the second non-printing area 66 has a gap G corresponding to the thickness of the resist printing layer 62, air can be smoothly escaped between the metal domes 45 and 45. Thereby, the favorable pressing feeling of the pressing part 17a of the operation button member 17 can be obtained. Other configurations and operational effects are the same as those of the first embodiment.

(Third embodiment)
Next, a digital camera according to a third embodiment of the electronic apparatus of the invention will be described with reference to FIG. 6A is a view showing the metal dome sheet 50, FIG. 6B is a view showing the substrate 31, and FIG. 6C is a view showing a state where the metal dome sheet 50 is attached to the substrate 31. FIG. In the present embodiment, portions overlapping with those in the first embodiment will be described using the reference numerals.

  In the present embodiment, as shown in FIG. 6A, four button portions 55 are provided on the metal dome sheet 50. Correspondingly, four pressing portions 17a (FIG. 2) of the operation button member 17, holes 20a (FIG. 2) formed in the rear cover 20, metal dome 45, and switch wiring portions 40 and 41 are provided. ing.

  As shown in FIG. 6B, four first switch wiring portions 40 and four second switch wiring portions 41 are formed on the substrate 31. Further, the cover lay film 35 that covers the substrate 31 is formed with a cover lay opening 37 in which the regions of the first switch wiring portion 40 and the second switch wiring portion 41 are uncovered regions. As a result, the copper foils of the first switch wiring portion 40 and the second switch wiring portion 41 are exposed from the cover lay opening 37.

  Further, the cover lay film 35 is formed with an air bend opening 36f that connects between the uppermost cover lay opening 37 in FIG. 6B and the third cover lay opening 37 from the top. Further, the cover lay film 35 is formed with an air bend opening 36g connecting the second cover lay opening 37 from the top of FIG. 6B and the lowermost cover lay opening 37. . As shown in FIGS. 6B and 6C, the metal dome sheet 50 is fixed to the substrate 31 with the positioning holes 51 aligned with the positioning holes 33 of the substrate 31.

  In the present embodiment, for example, when the lowermost metal dome 45 of the four metal domes 45 in FIG. 6C is pressed, the internal air is the second from the top through the air bend opening 36g. It moves in the direction of the metal dome 45. That is, since the cover lay openings 37 of the metal domes 45 that are not adjacent to each other are connected by the air bend openings 36g, the air bend openings 36g ensure a longer path than connecting the adjacent cover lay openings 37. Can do. Air escape between the metal domes 45, 45 can be performed smoothly. Thereby, the favorable pressing feeling of the pressing part 17a of the operation button member 17 can be obtained. Other configurations and operational effects are the same as those of the first embodiment.

(Fourth embodiment)
Next, a digital camera according to a fourth embodiment of the electronic apparatus of the invention will be described with reference to FIG. 7A is a view showing the metal dome sheet 50, FIG. 7B is a view showing the substrate 31, and FIG. 7C is a view showing a state where the metal dome sheet 50 is attached to the substrate 31. FIG. In the present embodiment, portions overlapping with those in the first embodiment will be described using the reference numerals.

  In the present embodiment, as shown in FIG. 7A, two button portions 55 are provided on the metal dome sheet 50. Correspondingly, two pressing portions 17a (FIG. 2) of the operation button member 17, two holes 20a (FIG. 2) formed in the rear cover 20, a metal dome 45, and two switch wiring portions 40 and 41 are provided. ing.

  As shown in FIG. 7B, two first switch wiring portions 40 and two second switch wiring portions 41 are formed on the substrate 31. Further, the cover lay film 35 that covers the substrate 31 is formed with a cover lay opening 37 in which the regions of the first switch wiring portion 40 and the second switch wiring portion 41 are uncovered regions. As a result, the copper foils of the first switch wiring portion 40 and the second switch wiring portion 41 are exposed from the cover lay opening 37.

  The cover lay film 35 is formed with an air bend opening 36 that connects between the upper and lower cover lay openings 37, and the air bend opening 36 is provided with a bent portion 43. The bent portion 43 is formed to ensure a longer path length of the air bend opening 36. As shown in FIGS. 7B and 7C, the metal dome sheet 50 is attached and fixed to the substrate 31 with the positioning holes 51 aligned with the positioning holes 33 of the substrate 31.

  In the present embodiment, for example, when the lower metal dome 45 in FIG. 7C is pressed, the internal air moves in the direction of the upper metal dome 45 through the air bend opening 36. At this time, as described above, the air bend opening 36 has a long path secured by the bent portion 43, whereby air can escape smoothly between the metal domes 45, and the operation button member 17. It is possible to obtain a good pressing feeling of the pressing portion 17a. Other configurations and operational effects are the same as those of the first embodiment.

  The configuration of the present invention is not limited to those exemplified in the above embodiments, and the material, shape, dimensions, form, number, arrangement location, and the like are appropriately changed without departing from the gist of the present invention. Is possible.

DESCRIPTION OF SYMBOLS 1 Camera 12 Operation button unit 17 Operation button member 30 Metal dome switch 31 Board | substrate 35 Coverlay film 36, 36c Air bend opening part 37 Coverlay opening part 40 1st switch wiring part 41 2nd switch wiring part 45 Metal dome

Claims (11)

A substrate having a first wiring portion and a second wiring portion, a conductive dome-shaped elastic member disposed at a position corresponding to the first wiring portion and the second wiring portion, and the elasticity An operation substrate including an insulating sheet material attached to the substrate in a state where a member is covered together with the first wiring portion and the second wiring portion, and elastically deforming the elastic member. In the electronic device, the first wiring portion and the second wiring portion are electrically connected via the elastic member,
The substrate includes a first opening formed in a region of the first wiring portion and the second wiring portion, and a second opening connected to the first opening. An electronic device including an insulating layer. The operation board has a plurality of the elastic members, and the insulating layer has a plurality of the first openings,
The electronic device according to claim 1, wherein the second opening is formed between the first openings adjacent to each other.   The electronic device according to claim 1, wherein the second opening is formed from the first opening to an outer edge of the substrate. The operation board has a plurality of the elastic members, and the insulating layer has a plurality of the first openings,
The electronic device according to claim 1, wherein the second opening is formed between the first openings that are not adjacent to each other.   The electronic apparatus according to claim 1, wherein the second opening is provided with a bent portion. A substrate having a first wiring portion and a second wiring portion, a conductive dome-shaped elastic member disposed at a position corresponding to the first wiring portion and the second wiring portion, and the elasticity An operation substrate including an insulating sheet material attached to the substrate in a state where a member is covered together with the first wiring portion and the second wiring portion, and elastically deforming the elastic member. In the electronic device, the first wiring portion and the second wiring portion are electrically connected via the elastic member,
The substrate includes a first non-printing region provided in a region of the first wiring unit and the second wiring unit, and a second non-printing region connected to the first non-printing region. An electronic device, comprising: a printing layer comprising:   The electronic device according to claim 6, wherein the print layer is a layer of a thermosetting resist ink. The operation board has a plurality of the elastic members, and a plurality of the first non-printing regions are formed in the printing layer,
The electronic device according to claim 6, wherein the second non-printing area is provided between the plurality of first non-printing areas.   The electronic device according to claim 6, wherein the second non-printing area is provided from the first non-printing area to an outer edge portion of the substrate.   The electronic device according to claim 6, wherein the substrate includes a jumper printing unit that is covered with the printing layer.   The electronic device according to claim 1, wherein the substrate is a single-sided flexible substrate.