Electronic module and electronic instrument

Abstract

To provide an electronic module and electronic instrument that can cope with a change of an analog block, while suppressing a troublesome work or increase in cost per product model.SOLUTION: An electronic module comprises a first circuit substrate, an analog block, and a second circuit substrate. The first circuit substrate has: a first connection part at a first surface; and a second connection part at a second surface on a side opposite the first surface, and the first connection part and the second connection part are electrically connected. The analog block has a third connection part, and the third connection part is connected to the first connection part. The second circuit substrate has a fourth connection part, and the fourth connection part is connected to the second connection part. A position of the first connection part and a position of the second connection part are different in a planar perspective view. The analog block includes at least a partial range of the second connection part and fourth connection part in a planar perspective view, and has a facing surface facing the first surface of the first circuit substrate, in which the facing surface has a protrusion part protruding toward a first circuit substrate side.SELECTED DRAWING: Figure 3

Description

[Technical field]

[0001] The present invention relates to an electronic module and an electronic device. [Background technology]

[0002] Conventionally, in electronic devices such as watches, a control unit such as a microcomputer located on a board transmits and receives signals between each component connected to a connection terminal on the board. Some of the components are located on the board together with the microcomputer, while other components, such as a group of components (analog blocks) that have moving parts or perform external notification or external detection operations, are located outside the board. The positions of the microcomputer, each component, and signal wiring on the board are designed according to the relative positions of each of these components.

[0003] There is a technology for connecting two circuit boards in a watch. One circuit board is connected to the movement of the watch. The two circuit boards are located on either side of a housing, and are stably connected by an interconnector located inside the housing, which has elasticity (Patent Document 1). [Prior art documents] [Patent documents]

[0004] [Patent Document 1] JP 2018-9934 A Summary of the Invention [Problem to be solved by the invention]

[0005] However, there are cases where the board needs to be redesigned in response to changes in the analog blocks of an electronic device. If all boards are redesigned in this case, there is a problem that the effort and cost per product model increases.

[0006] An object of the present invention is to provide an electronic module and electronic equipment that can accommodate changes in analog blocks while suppressing increases in the effort and cost per product model. [Means for solving the problem]

[0007] In order to achieve the above object, the present invention provides a first circuit board having a first connection portion on a first surface and a second connection portion on a second surface opposite to the first surface, the first connection portion and the second connection portion being electrically connected; an analog block having a third connection portion, the third connection portion being connected to the first connection portion of the first circuit board; a second circuit board having a fourth connection portion, the fourth connection portion being connected to the second connection portion of the first circuit board; Equipped with The position of the first connection portion and the position of the second connection portion are different in plan view, the analog block has an opposing surface that faces the first surface of the first circuit board and that includes at least a portion of the second connection portion and the fourth connection portion in a planar perspective view, and the opposing surface has a protruding portion that protrudes toward the first circuit board. It is an electronic module. In order to achieve the above object, the present invention provides a method for producing a liquid crystal display comprising: a first circuit board having a first connection portion on a first surface and a second connection portion on a second surface opposite to the first surface, the first connection portion and the second connection portion being electrically connected; an analog block having a third connection portion, the third connection portion being connected to the first connection portion of the first circuit board; a second circuit board having a fourth connection portion, the fourth connection portion being connected to the second connection portion of the first circuit board; Equipped with The position of the first connection portion and the position of the second connection portion are different in plan view, the first circuit board has a light receiving element that detects light incident from the analog block side; The second circuit board has a control unit that executes a process based on a detection result by the light receiving element. It is an electronic module. Effect of the Invention

[0008] According to the present invention, there is an advantage that it is possible to cope with changes in analog blocks while suppressing increases in the effort and cost per product model. [Brief description of the drawings]

[0009] [Figure 1] FIG. 1 is a front view of an electronic timepiece according to a first embodiment. [Diagram 2] FIG. 2 is an exploded perspective view illustrating the structure of the electronic module according to the first embodiment. [Diagram 3] 3A is a plan view showing the upper surface of a first circuit board, and FIG. 3B is a bottom view showing the lower surface of the first circuit board. [Figure 4] FIG. 4 is a plan view showing the upper surface of a second circuit board. [Diagram 5] FIG. 2 is a partial cross-sectional view of an electronic module including one protrusion. [Figure 6] FIG. 4 is a perspective view showing the lower surface side of a second circuit board. [Figure 7] FIG. 13 is an exploded perspective view of each component of an electronic module according to a second embodiment. [Figure 8] FIG. 11 is a partial cross-sectional view including one protrusion of an electronic module according to a second embodiment. [Figure 9] 13 is a plan view showing the upper surface of a first circuit board according to a modified example. FIG. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0010] Hereinafter, an embodiment of the present invention will be described with reference to the drawings. [First embodiment] FIG. 1 is a front view of an electronic timepiece 1 according to a first embodiment.

[0011] The electronic timepiece 1 comprises a housing 2, a dial 52, a hand 51, a bezel 11, and operation receiving members such as push button switches B1-B3 and a crown C1 that receive external operations. The hand 51 is rotatably positioned on the dial 52, and content is displayed according to the direction pointed by the hand 51. Content displayed by the hand 51 includes time (which may be time and date including date and day of the week). Marks (hour characters 53) for indicating the displayed time are positioned on the dial 52. In other words, the electronic timepiece 1 is an electronic device of this embodiment.

[0012] Small windows 101-104 (dials) are located on the dial 52 and occupy a part of it. Some of the hands 51 rotate inside these small windows 101-104, and can display the day of the week, the alarm time, the time in other cities around the world (including UTC), and the 24-hour clock.

[0013] Furthermore, dial 52 has an opening 54 at the 6 o'clock position. Date wheel 55 is located below (on the back side of) dial 52, and a number-shaped indicator (date indicator) corresponding to the date is selectively displayed through opening 54 by rotating date wheel 55. Date wheel 55 is located between two concentric circles with different radii, and number-shaped members are supported by support arms extending from the two concentric circles. Therefore, light is transmitted through parts other than the number-shaped members.

[0014] The housing 2 has a cylindrical shape with open top and bottom faces, and has the above-mentioned hands 51, date wheel 55, dial 52, and hour characters 53 inside. In addition to the above, the housing 2 also houses an electronic module 20 (see FIG. 2) including a circuit section 21 (see FIG. 2) and an analog block 22 (see FIG. 2). The circuit section 21 includes a microcomputer 217 (see FIG. 2) that controls the timekeeping operation and the display operation by the hands 51. The analog block 22 includes a stepping motor that rotates the hands 51 and the date wheel 55. The push button switches B1 to B3 and the crown C1 protrude outward from the side of the housing 2. Electric signals related to these operations are transmitted to the internal circuit board through the housing 2. At the 12 o'clock and 6 o'clock directions of the housing 2, the belt attachment parts 2a extend outward from the housing 2 in a plan view seen from above the display surface of the hands 51. The housing 2 may be made of an insulating material such as resin or ceramic, or may be made of a metal material such as titanium. The lower end (rear side) of the housing 2 is sealed with a back cover (not shown).

[0015] The upper side of the dial 52 and the hands 51 (the upper end, front side of the housing 2) are covered with a transparent windshield member to seal the housing 2. The periphery of the dial 52 is surrounded by a bezel 6. Some or all of the hour characters 53 and the like may be fixed to the bezel 6. A solar panel is located annularly below the dial 52 and the date wheel 55, along the inner circumference of the bezel 6. Members with low light transmittance or no light transmittance, such as the outer frames of the small windows 101-104, the hour characters 53, and the date mark of the date wheel 55, are located partially on the light receiving surface of the solar panel.

[0016] The bezel 11 is located on the periphery of the electronic timepiece 1. The bezel 11 may have a marking that is indicated by a hand 51. The bezel 11 may also be used for decorative purposes. Furthermore, the bezel 11 may function as an antenna element when the electronic timepiece 1 receives radio waves or performs communication.

[0017] FIG. 2 is an exploded perspective view illustrating the structure of the electronic module 20 of this embodiment. The electronic module 20 comprises a circuit section 21 and an analog block 22. The circuit section 21 receives power and controls the operation of the electronic watch 1. The analog block 22 is a collection of components that input / output or generate analog signals depending on the operation, or that perform an operation depending on an input signal. The analog block 22 is located on the display surface side (upper side) of the electronic watch 1, and the circuit section 21 is located below it (back side). The circuit section 21 and analog block 22 are fixed to each other in an overlapping state by mainly small-sized screws such as screws S. The type of screw S may be determined arbitrarily depending on the required strength, space, etc.

[0018] Various components of the analog block 22 are fixed to a support member 220. The analog block 22 may include some or all of the following components: a stepping motor that rotates the pointer 51, an operation detection mechanism 22e for the push button switches B1 to B3 and an operation detection mechanism 22d for the crown C1, a unit that turns on an LED light, a vibration motor and a beep sound generator for an announcing operation, etc. The operation detection mechanisms 22d, 22e, etc. may use conventionally known components that detect pressing operations and rotating operations.

[0019] The analog block 22 has a motor connection terminal 22a, a detection unit connection terminal 22b, and a solar cell connection terminal (not shown) on the lower surface of the analog block 22, which is the side of the first circuit board 211 of the circuit unit 21. The connection terminals 22a, 22b, the solar cell connection terminal, and the operation detection mechanisms 22d, 22e correspond to the third connection portion of this embodiment. The support member 220 of the analog block 22 has an opposing surface 221f that faces the upper surface 211T of the first circuit board 211, and has a protruding portion 221 that protrudes toward the first circuit board 211. The opposing surface 221f has holes 221h (see FIG. 5) at multiple locations, six in this case, as described below. Inside the hole 221h, a support post 222 that further protrudes from the opposing surface 221f is located. The above-mentioned screw S is screwed into the support post 222, and the support post 222 is used to fix the circuit unit 21 and the analog block 22. The protruding portion 221 may be commonly connected to a plurality of supporting columns 222. The four supporting columns 222 shown in FIG.

[0020] The circuit section 21 has a first circuit board 211 and a second circuit board 213. The second circuit board 213 is a common board and operates as a conventional control board. On the lower surface 213B side of the second circuit board 213, electronic components such as a microcomputer 217 (controller) having a CPU (Central Processing Unit) and a RAM (Random Access Memory), a memory such as a flash memory, and a module for controlling wireless communication are located. In addition, a battery accommodating section 213c for accommodating a battery inserted from the side of the insertion port E is located approximately in the center of the lower surface 213B of the second circuit board 213. An upper surface 213T of the second circuit board 213 and a lower surface 211B of the first circuit board 211 face each other.

[0021] The second circuit board 213 may be a laminated board or a double-sided board depending on the required wiring patterning, etc. The first circuit board 211 may be a double-sided board that is thinner than the second circuit board 213. In particular, it is preferable for the first circuit board 211 to be as thin as possible. This reduces the increase in thickness of the electronic timepiece 1 due to the thickness of the added first circuit board 211 compared to the second circuit board 213, which tends to be about the same thickness as a conventional circuit board. Accordingly, the materials of the base materials of the first circuit board 211 and the second circuit board 213 do not necessarily have to be the same.

[0022] The second circuit board 213, the first circuit board 211, and the analog block 22 are aligned by the support 222 and the first through-hole 211h and the second through-hole 213h. In an aligned state, the screw S is screwed into the hole of the support 222 to fix the second circuit board 213, the first circuit board 211, and the analog block 22. In a fixed state, the head of the screw S is located inside the second through-hole 213h and does not protrude from the lower surface 213B (fourth surface) of the second circuit board 213.

[0023] FIG. 3A is a plan view of the first circuit board 211, looking at an upper surface 211T, and FIG. 3B is a bottom view of the lower surface 211B. 3(a) is the surface facing the analog block 22. On the top surface 211T, there are located a connection pad 211a for the stepping motor, a phototransistor 216 (light receiving element; outer frame shown by dotted line) used to detect the pointer and its connection pad 211b, a connection pad 211c for the solar panel, an operation detection unit 211d for the push button switches B1 to B3, and an operation detection unit 211e for the crown C1. Signal wiring extends from the connection pads 211a, 211b, 211c and the operation detection units 211d, 211e to through vias that connect the top and bottom sides of the first circuit board 211, respectively.

[0024] The positions of the connection pads 211a, 211c and the operation detectors 211d, 211e in a plan view correspond to the positions of the motor connection terminal 22a, the solar cell connection terminal, the operation detector mechanism 22d of the crown C1, and the operation detector mechanism 22e of the push button switches B1 to B3 in the analog block 22, and are connected to each other. The connection here does not mean a fixed connection using a joining member. It is sufficient that they are at least in contact in a state where they are securely electrically connected. On the other hand, the connection between the connection terminals and the connection pads may have a fitting portion according to the unevenness. The connection pads 211a to 211c, the operation detectors 211d, 211e, and the connection pads of the solar cell connection terminal correspond to the first connection portion of this embodiment. The design of the third connection portion and the first connection portion in a plan view can be determined for each model of electronic timepiece and can be changed.

[0025] A through hole is located at a position in the analog block 22 that overlaps with the phototransistor 216 in a plan view. The through hole allows external light from the display surface side to pass through. A gear that transmits the rotation of the stepping motor to the pointer 51 is located at the position of the through hole in a plan view. When the gear having a through hole rotates and the through hole of the gear overlaps with the through hole of the analog block 22 in a plan view, external light reaches the phototransistor 216 and the amount of detected light increases. This allows the position of the pointer 51 to be specified according to the rotation angle of the gear. Furthermore, multiple gears that transmit rotation to a certain pointer 51 may each have a through hole. External light may reach the phototransistor 216 when all of these multiple through holes overlap with the through holes of the analog block in a plan view.

[0026] The through-hole of the analog block 22 corresponding to one of the phototransistors 216 may be located at a position that does not overlap with the gear in a plan view. This phototransistor 216 detects the amount of external light that is not blocked by the gear and enters from the display surface side. This amount of light or a value lower than this amount of light may be set as a threshold value for the other phototransistors 216 to detect external light. In other words, when the other phototransistors 216 detect an amount of external light greater than the threshold value, the corresponding pointer is identified as being at a position detected by the phototransistor 216.

[0027] The phototransistor 216, which detects external light without being blocked by gears or the like, may further be used to detect nighttime, a dark room, etc. If the amount of light detected by this phototransistor 216 continues to be smaller than a reference value for a certain period of time, it may be determined that it is nighttime or in a drawer. In this case, the electronic watch 1 may automatically transition to a sleep mode in which operation and power consumption are restricted. In the sleep mode, for example, the operation of the second hand may be stopped and communication operations may be suspended. The automatic transition to the sleep mode (auto sleep function) may be based on detection of motion by an acceleration sensor or the like in addition to detection of external light by the phototransistor 216.

[0028] The lower surface 211B (second surface) shown in FIG. 3(b) is the surface of the first circuit board 211 opposite to the upper surface 211T, and faces the second circuit board 213. The positions of the through vias are the same on the upper surface 211T and the lower surface 211B. On this lower surface 211B, second connection pads 32 (second connection portions) are located, which transmit and receive signals between the first connection portion of the upper surface 211T and the third connection portion and the second circuit board 213. The through holes and the second connection pads 32 are electrically connected by signal wiring. The pattern of the signal wiring may be designed appropriately without following a specific pattern.

[0029] The second connection pads 32 are divided into a plurality of groups each including a plurality of pads, and are arranged in a group. For example, in the four second connection pad groups 32a, the second connection pads 32 are arranged in a ring shape at approximately equal angular intervals in eight directions relative to the center position of the first through hole 211h. In the other two second connection pad groups 32b, the second connection pads 32 are arranged in an arc shape at approximately equal angular intervals in six directions excluding two of the eight directions relative to the center position of the first through hole 211h. That is, the position of the second connection pads 32 is different from the position of the first connection portion in a planar perspective view.

[0030] The first circuit board 211 has a screw hole 211j for fixing the stepping motor, and a hole 211k for preventing a protruding portion of the fixed stepping motor, here a coil portion, from contacting the first circuit board 211. When the stepping motor is directly fixed to the first circuit board 211, the coil portion of the stepping motor protrudes to a position intersecting with a plane including the upper surface 211T of the first circuit board 211. In contrast, the hole 211k of the first circuit board 211 is positioned so as to include a position where the coil portion of the stepping motor intersects with a plane including the upper surface 211T of the first circuit board 211 when the stepping motor is directly fixed. Therefore, the electronic module 20 can prevent the coil portion of the stepping motor from contacting the first circuit board 211 while directly fixing the stepping motor to the first circuit board 211. At the stage where the stepping motor is fixed to the first circuit board 211, an inspection is performed to see whether the stepping motor rotates the gear normally. In this inspection, a hole for visually checking the rotation of the gear between the first circuit board 211 and the support member of the analog block 22 is a detection hole 211q.

[0031] When the first circuit board 211 is assembled and fixed to the electronic module 20, a positioning pin is inserted into the positioning hole 211p to align it with other members. This allows for easy and accurate alignment. Also, the through hole 211m is located at a position where the analog block 22 can come into contact with the first circuit board 211 if the analog block 22 is bent when the pointer 51 is assembled and fixed to the analog block 22. This makes it less likely that problems will occur, such as the analog block 22 coming into contact with the first circuit board 211 and being scratched, during assembly and manufacturing of the electronic module 20.

[0032] These holes, that is, the screw hole 211j, the hole 211k, the detection hole 211q, the positioning hole 211p, and the through hole 211m, are all positioned in accordance with the configuration of the analog block 22. In other words, when the analog block 22 is changed, the formation positions of these holes also need to be changed in accordance with the analog block 22. Since all of these holes are positioned on the first circuit board 211, even if the position of the stepping motor of the analog block 22 is changed, for example, it is only necessary to change the positions of the holes on the first circuit board 211 accordingly.

[0033] On the other hand, if at least some of these holes are located on the second circuit board 213, the positions of the holes on the second circuit board 213 must be changed in accordance with the change in the analog block 22. Therefore, the second circuit board 213 does not become a common board. Alternatively, if the position of the stepping motor of the analog block 22 is restricted to match the position of the hole located on the second circuit board 213, which is a common board, the degree of freedom in designing the second circuit board 211 and the analog block 22 will decrease.

[0034] FIG. 4 is a plan view of upper surface 213T of second circuit board 213. As shown in FIG. Fourth connection pads 34 (fourth connection portions) are located on the upper surface 213T (third surface) of the second circuit board 213. The fourth connection pads 34 include a fourth connection pad group 34a overlapping the position of the second connection pad group 32a on the lower surface 211B of the first circuit board 211 in a plan view, and a fourth connection pad group 34b overlapping the second connection pad group 32b. Therefore, by aligning the first circuit board 211 and the second circuit board 213 and fastening them with screws, each of the fourth connection pads 34 is electrically connected to the corresponding second connection pad 32. That is, by fastening the first circuit board 211 and the second circuit board 213 with the screws S, it is easy to reliably obtain electrical continuity between the second connection pads 32 and the fourth connection pads 34.

[0035] Furthermore, the positions of the second connection pads 32 and the fourth connection pads 34 at least partially overlap the range of the protruding portion 221 of the analog block 22 in a planar perspective view. That is, when the screws are tightened, the first circuit board 211 and the second circuit board 213 are locally supported from below by the protruding portion 221, which has high rigidity and strength, in the insertion direction of the screw S, i.e., in the up-down direction. This ensures that the fourth connection pads 34 and the second connection pads 32 are pressed against each other.

[0036] It is not necessary that the planar shapes of first circuit board 211 and second circuit board 213 are the same. If necessary, the planar shape of either one may be partially protruding or recessed from the planar shape of the other.

[0037] 5 is a partial cross-sectional view of the electronic module 20 including one protrusion 221. In this view, the screw S is omitted.

[0038] As described above, in the electronic module 20, the analog block 22 and the circuit section 21 are positioned so as to overlap each other. The protruding portion 221, which protrudes relatively toward the first circuit board 211 side in the support member 220 of the analog block 22, faces and contacts the first circuit board 211 at the facing surface 221f. The protruding portion 221 has a hole 221h. A support post 222 is positioned inside the hole 221h. The support post 222 has a screw hole 222h that extends from its lower end into the interior along the extension direction. The inner wall surface of the screw hole 222h has a threaded groove to engage with a screw S.

[0039] The support pillar 222 penetrates the first through-hole 211h of the first circuit board 211. Furthermore, the support pillar 222 is partially inserted into the second through-hole 213h of the second circuit board 213. This facilitates alignment of the support pillar 222 with the first circuit board 211 and the second circuit board 213. Furthermore, since a space remains below the second through-hole 213h into which the support pillar 222 is not inserted, the portion of the head of the screw S protruding from below the second circuit board 213 is reduced.

[0040] 3 and 4, a plurality of positions where the first circuit board 211, the second circuit board 213, and the analog block 22 are fixed by the screws S may be distributed approximately evenly. Here, the positions of the six second through holes 213h are arranged in a regular polygonal or annular shape slightly closer to the edge than the middle between the center and the edge of the second circuit board 213 in a plan view. As described above, the positions of the second through holes 213h in a plan view correspond to the positions of the first through holes 211h and the positions of the protruding parts 221. Therefore, the pressure applied to the first circuit board 211 and the second circuit board 213 when the screws are fastened is distributed approximately evenly, and distortion and damage of the first circuit board 211 and the second circuit board 213 are reduced.

[0041] In this way, first circuit board 211 is an intermediate board through which signals are passed when signals are exchanged between second circuit board 213 and analog block 22. At this time, the first connection portion on upper surface 211T of first circuit board 211 corresponds to the position of the third connection portion on analog block 22. At the same time, the position of second connection pad 32 on lower surface 211B of first circuit board 211 corresponds to the position of fourth connection pad 34 on upper surface 213T of second circuit board 213. In other words, even if the position and number of each portion on analog block 22 change, second circuit board 213 can continue to be used as is as long as the position of the first connection portion and the pattern of signal wiring on upper surface 211T of first circuit board 211 are changed.

[0042] FIG. 6 is a perspective view of the lower surface 213B of the second circuit board 213. As shown in FIG. This perspective view is a view from the opposite side to the second circuit board 213 shown in FIG. 2, that is, from the side of the insertion port E. In the battery storage section 213c, the battery is inserted and removed in a direction along the second circuit board 213 through the insertion port E. That is, the direction of insertion and removal of the battery is the direction indicated by the thick arrow. The battery inserted into the battery storage section 213c is fixed by the leaf spring 213cs. The battery has, for example, a button-type shape and may be a dry cell or a secondary cell. In the electronic module 20, electronic components protruding in the height direction from the lower surface 213B are not located in a range that prevents the insertion and removal of the battery through the insertion port E. For example, inspection pads P used for inspection during manufacturing inspection may be lined up in this portion. By positioning the upper surface (exposed surface) of the inspection pad P so as to be substantially flush with the lower surface 213B of the second circuit board 213, it is possible to avoid preventing the insertion and removal of the battery through the insertion port E.

[0043] [Second embodiment] Next, an electronic module 20a according to a second embodiment will be described. FIG. 7 is an exploded perspective view of each component of the electronic module 20a.

[0044] The electronic module 20a of the second embodiment has a spacer 212 and an interconnector 214 between a first circuit board 211 and a second circuit board 213.

[0045] Spacer 212 is an insulating film, and separates first circuit board 211 and second circuit board 213 so that short circuit is unlikely to occur between them. Spacer 212 also serves as a buffer member for the protruding parts on the opposing surfaces of first circuit board 211 and second circuit board 213. When first circuit board 211 and second circuit board 213 are screwed together, if there is unevenness between opposing lower surface 211B and upper surface 213T, more localized stress is applied to the protruding parts. This stress makes first circuit board 211 and second circuit board 213 more susceptible to damage. Spacer 212 relieves such stress and reduces the occurrence of damage.

[0046] The spacer 212 has a through hole 212h including the first through hole 211h, the second through hole 213h, and the support 222 in a plan view position. The through hole 212h is wider than the second through hole 213h of the second circuit board 213 in a plan view. The annular interconnector 214 is located in this through hole 212h. That is, the interconnector 214 is located between the second connection pad 32 and the fourth connection pad 34. As described above, the interconnector 214 does not conduct electricity between the second connection pads 32 and the fourth connection pads 34 arranged in a ring shape around the support 222. On the other hand, the interconnector 214 has anisotropic conductivity so as to conduct electricity between the opposing second connection pads 32 and the fourth connection pads 34. The thickness of the interconnector 214 is approximately the same as the thickness of the spacer 212, so that the second connection pads 32 and the fourth connection pads 34 can be reliably contacted and easily conducted.

[0047] FIG. 8 is a partial cross-sectional view including one protrusion 221 of an electronic module 20a according to the second embodiment. As described above, the thickness of spacer 212 and the thickness of interconnector 214 are approximately the same, and a layer of approximately uniform thickness is obtained between first circuit board 211 and second circuit board 213.

[0048] The support 222 passes through the first through hole 211h of the first circuit board 211 and a hole at the approximate center of the interconnector 214, and extends into the second through hole 213h of the second circuit board 213. This allows the interconnector 214 to be appropriately aligned with the first circuit board 211 and the second circuit board 213. An alignment mark (marking) or the like may be used for alignment of the interconnector 214 in the rotational direction within the plane of the spacer 212. The alignment mark may be located, for example, on the support 222, the first circuit board 211 or the spacer 212, and the interconnector 214.

[0049] FIG. 9 is a plan view showing an upper surface 213Ta of a second circuit board 213 of the modified example. The fourth connection pads 34 may be positioned, for example, side by side between two protruding portions 221. For example, the fourth connection pads 34 are arranged in a two-dimensional matrix, or in a strip here, in a plan view. In accordance with the arrangement of the fourth connection pads 34, the positions of the second connection pads on the lower surface (fourth surface) of the second circuit board 213 are also in a two-dimensional matrix, or in a strip, in a plan view.

[0050] 2, in the portion where the fourth connection pads 34 are lined up, the support member 220 of the analog block 22 is thickened in a strip shape so as to connect between the support columns 222 on both sides. Therefore, even in such a position of the fourth connection pads 34, it is possible to reduce distortion and damage of the first circuit board 211 and the second circuit board 213 by fastening with screws. By fastening with screws at both ends of the arrangement of the fourth connection pads 34, electrical continuity is reliably obtained between the second connection pads 32 and the fourth connection pads 34.

[0051] As described above, the electronic module 20, 20a of this embodiment includes the first circuit board 211, the analog block 22, and the second circuit board 213. The first circuit board 211 has a first connection portion on the upper surface 211T (first surface) and a second connection pad 32 on the lower surface 211B opposite to the upper surface 211T, and the first connection portion and the second connection pad 32 are electrically connected. The analog block 22 has a third connection portion, and the third connection portion is connected to the first connection portion of the first circuit board 211. The second circuit board 213 has a fourth connection pad 34, and the fourth connection pad 34 is connected to the second connection pad 32 of the first circuit board 211. The position of the first connection portion and the position of the second connection pad 32 are different in planar perspective. The analog block 22 has an opposing surface 221f, and the opposing surface 221f has a protruding portion 221 protruding toward the first circuit board 211 side. The facing surface 221f includes at least a portion of the second connection pads 32 and the fourth connection pads 34 in a planar perspective view, and faces the upper surface 211T of the first circuit board 211. The facing surface 221f has a protruding portion that protrudes toward the first circuit board. In such electronic modules 20 and 20a, the design of the first circuit board 211 can be changed according to the positions and number of peripheral devices such as motors and light receiving elements in the analog block 22. Meanwhile, by matching the positional relationship of the lower surface 211B of the first circuit board 211 with the second circuit board 213, it is not necessary to change the second circuit board 213 every time a design change is made. Therefore, the effort and cost of responding to the change of the analog block for each model, such as a design change or model change controlled by the same microcomputer 217, is reduced. Therefore, the electronic modules 20 and 20a can respond to the change of the analog block while suppressing an increase in cost and effort.

[0052] Furthermore, the electronic module 20 has a plurality of second connection pads 32. The second connection pads 32 may be arranged in a plurality of groups each including a plurality of second connection pads. That is, the second connection pads 32 may be arranged in groups on a surface that is stably supported by the protruding portion 221 when the circuit unit 21 and the analog block 22 are fixed. This ensures that the second connection pads 32 and the fourth connection pads 34 come into contact with each other in the electronic module 20, making it easier to obtain electrical continuity.

[0053] The first circuit board 211 may have a first through hole 211h, and the second circuit board 213 may have a second through hole 213h. The analog block 22 has a support 222 extending from the opposing surface 221f. The support 222 is inserted into the first through hole 211h and the second through hole 213h. This allows the analog block 22 having the support 222 to be easily and accurately aligned with the first circuit board 211 and the second circuit board 213 having the first through hole 211h and the second through hole 213h, respectively. This simplifies the process of fixing the analog block 22, the first circuit board 211, and the second circuit board 213, and reduces positional deviations.

[0054] Furthermore, the support 222 may have a screw hole 222h along the extending direction. The first circuit board 211, the second circuit board 213, and the analog block 22 can be fixed to each other by a screw S screwed into the screw hole 222h. In this way, the analog block 22, the first circuit board 211, and the second circuit board 213 are fixed in the aligned positions by the screw S, so that the electronic module 20 is fixed while more reliably reducing misalignment.

[0055] The first circuit board 211 also has a plurality of second connection pads 32. The plurality of second connection pads 32 may be arranged in a ring shape or an arc shape around the first through hole 211h. By arranging the second connection pads 32 evenly in radial positions with respect to the central axis, the force applied during fixing tends to be uniform. Therefore, the electronic module 20, 20a can reduce the occurrence of poor conduction between the second connection pads 32 and the fourth connection pads 34 and the occurrence of distortion or damage due to excessive force.

[0056] Alternatively, the protruding portion 221 may extend between two supports 222 in a plan view. The first circuit board 211 has a plurality of second connection pads 32, which may be arranged in a line or band along the protruding portion 221. Even with such an arrangement of the protrusions 221 and the second connection pads 32, the conduction between the second connection pads 32 and the fourth connection pads 34 can be appropriately ensured by fastening the supports 222 at both ends with screws.

[0057] The electronic module 20a may also include an interconnector 214 between the second connection pad 32 of the first circuit board 211 and the fourth connection pad 34 of the second circuit board 213. In particular, when there are irregularities between the first circuit board 211 and the second circuit board 213 due to screw heads or the like, a space is provided around them. This reduces an increase in local stress on the first circuit board 211 and the second circuit board 213. This allows the first circuit board 211 and the second circuit board 213 to be fixed more stably. In addition, the second connection pad 32 and the fourth connection pad 34 are joined more stably to obtain electrical continuity.

[0058] Moreover, the analog block 22 has a plurality of support pillars 222. The support pillars 222 may be located in a dispersed manner. By dispersing the locations capable of stably supporting the connection between the second connection pads 32 and the fourth connection pads 34, the stress distribution between the first circuit board 211 and the second circuit board 213 is not biased. Therefore, the electronic modules 20, 20a are less susceptible to distortion and damage during assembly.

[0059] Furthermore, the multiple support posts 222 may be positioned in a ring shape between the center and edge of the second circuit board 213 in a plan view. The fixation (screw fastening) between the first circuit board 211 and the second circuit board 213 is supported at a position that is not too close to the center or edge. This makes it difficult for the first circuit board 211 and the second circuit board 213 to float, and also ensures electrical continuity between the second connection pad 32 and the fourth connection pad 34.

[0060] The electronic module 20 may also have a battery storage section 213c located on the bottom surface 213B opposite to the top surface 213T on which the third connection pads 33 of the second circuit board 213 are located. By having a configuration in which a battery is stored on the bottommost side of the electronic module 20, the electronic watch 1 makes it easy to attach a battery.

[0061] The battery storage section 213c also has an insertion opening E through which the battery can be inserted and removed in a certain direction along the underside 213B. Electronic components protruding from the underside 213B are not located in an area that would prevent the battery from being inserted or removed through the insertion opening E. This makes it easy to attach and remove the battery. The electronic watch 1 also reduces the possibility of damaging components on the second circuit board 213 when attaching or removing the battery.

[0062] Alternatively, the electronic module 20 of this embodiment includes a first circuit board 211, an analog block 22, and a second circuit board 213. The first circuit board 211 has a first connection portion on an upper surface 211T (first surface) and a second connection pad 32 on a lower surface 211B opposite to the upper surface 211T, and the first connection portion and the second connection pad 32 are electrically connected. The analog block 22 has a third connection portion, and the third connection portion is connected to the first connection portion of the first circuit board 211. The second circuit board 213 has a fourth connection pad 34, and the fourth connection pad 34 is connected to the second connection pad 32 of the first circuit board 211. The position of the first connection portion and the position of the second connection pad 32 are different in planar perspective. The first circuit board 211 may have a phototransistor 216 that detects light incident from the analog block 22 side. In this case, the second circuit board 213 has a microcomputer 217 that executes processing based on the detection result by the phototransistor 216. That is, the phototransistor 216, which is an electronic component, is directly fixed to the circuit board. Since the circuit board directly fixed is the first circuit board 211, there is no need to adjust the number or position of the phototransistors on the second circuit board 213, which is a common board. In other words, since the phototransistor 216 is located on the individually designed first circuit board 211, the degree of freedom in the arrangement of the phototransistor 216 is improved. In addition, the phototransistor 216 is located on the first circuit board 211, which is closer to the analog block 22 and thus the display surface, than the second circuit board 213. This allows the electronic watch 1 to reduce the loss of incident light and improve the detection sensitivity. Furthermore, there is no need to prepare any other board for directly fixing the phototransistor 216 in addition to the first circuit board 211 and the second circuit board 213. Therefore, the electronic module 20 can accommodate changes in the analog block while suppressing an increase in the effort and cost per product model.

[0063] The electronic watch 1, which is an electronic device of this embodiment, is equipped with the above-mentioned electronic module 20. Such an electronic watch 1 reduces the effort and cost involved in developing models that have similar performance but slightly different functions and designs. This makes it possible to develop multiple product models more quickly and at lower cost than before.

[0064] The present invention is not limited to the above-described embodiment, but may be modified in various ways. For example, the second connection pads 32 and the fourth connection pads 34 do not have to be located around the protruding portion 221 having multiple sets. Instead, one set of the second connection pads 32 and the fourth connection pads 34 may be located corresponding to each of the multiple protruding portions 221.

[0065] On the other hand, a plurality of pairs of the second connection pads 32 and the fourth connection pads 34 corresponding to a certain protrusion 221 may be grouped together so that the pairs are connected to the same type of configuration in the analog block 22. Alternatively, the combinations of the second connection pads 32 and the fourth connection pads 34 may be positioned randomly.

[0066] The second through-hole 213h may have a shape suitable for screw fastening, such as a stepped structure.

[0067] In the above, the support pillars 222 have a length sufficient to be inserted into the first through-hole 211h and the second through-hole 213h, but this is not limited to the above. If alignment can be easily achieved by another method, the support pillars 222 may be shorter than the length of the first through-hole 211h, i.e., the thickness of the first circuit board 211. Furthermore, the height of only some of the multiple support pillars 222 may be longer than the thickness of the first circuit board 211.

[0068] In the above description, the protrusions 221 at positions corresponding to the second connection pads 32 all have the support posts 222 extending therefrom, but this is not limited to the above. There may be a mixture of protrusions 221 that have support posts 222 and are fastened with screws, and protrusions 221 that do not have support posts 222 and are not fastened with screws. Even in this case, it is preferable that the positions of the screws S are determined so that no problems arise with the electrical continuity between the second connection pads 32 and the fourth connection pads 34.

[0069] In the first embodiment, the second connection pads 32 are arranged in a ring or arc shape in plan view, but this is not limited to this. They may be arranged in a frame shape, or may be arranged at discrete angular intervals depending on the number of the second connection pads 32. In addition, the protruding portion 221 may be rectangular or the like instead of a circular shape in plan view. On the other hand, in the modified example, the fourth connection pads 34, i.e., the second connection pads 32, are arranged in a strip shape, but this is not limited to this. The fourth connection pads 34 may be arranged in a line on a straight line. Alternatively, they may be positioned in an arrangement that is missing teeth from a two-dimensional matrix. If the fourth connection pads 34 and the second connection pads 32 are completely arranged in two dimensions, it may be difficult to set the signal wiring pattern appropriately. Therefore, the arrangement may be such that the fourth connection pads 34 and the second connection pads 32 are not present at points necessary to obtain an appropriate signal wiring pattern.

[0070] Furthermore, the support pillar 222 does not have to extend further downward through the protruding portion 221. The support pillar 222 may be structured so as to overlap the protruding portion 221. In this case, the screw hole 222h may extend across the protruding portion 221 and the support pillar 222.

[0071] In the above description, the pillars 222 are arranged in a ring shape (hexagonal shape) in plan view, but this is not limited to the above. For example, when the shape of the circuit unit 21 in plan view is not isotropic, the pillars 222 may be positioned in a dispersed manner according to the unevenness of the circuit unit 21.

[0072] In the above description, the phototransistor 216 is used to detect the position of the pointer 51 and to determine whether or not the device is to enter a sleep mode. However, the phototransistor 216 may be used for only one of these purposes. Alternatively, the phototransistor 216 may be used for another purpose.

[0073] Furthermore, the electronic device is not limited to the electronic watch 1. The above disclosure may be particularly useful when developing multiple designs for small portable electronic devices. In addition, the specific configurations, contents and procedures of the processing operations, etc. shown in the above embodiments can be modified as appropriate without departing from the spirit of the present invention. The scope of the present invention includes the scope of the invention described in the claims and its equivalents. [Explanation of symbols]

[0074] 1. Electronic Clock 2. Chassis 2a Mounting part 6. Partition Board 11 Bezel 20, 20a Electronic Module 21 Circuit section 211 1st circuit board 211B Bottom 211T top surface 211a~211c Connection pads 211d, 211e Operation detection unit 211h 1st through hole 211j screw hole 211k hole 211m through hole 211p Positioning hole 211q Detection hole 212 Spacer 212h through hole 213 2nd circuit board 213B Bottom surface 213T, 213Ta top surface 213c Battery compartment 213h 2nd through hole 214 Interconnector 216 Phototransistor 217 Microcomputer 22 Analog Block 22a, 22b Connection terminals 22d, 22e Operation detection mechanism 220 Support member 221 Protrusion 221f Opposite surface 221h Hole 222 Post 222h Screw hole 32 Second connection pad 32a, 32b Second connection pad group 33 3rd connection pad 34 4th connection pad 34a, 34b Fourth connection pad group 51 Guidelines 52 Dial 53 Tokiji 54 Aperture 55 day car 101~104 Small window B1~B3 Push button switches C1 Crown E Insertion port S bis

Claims

1. a first circuit board having a first connection portion on a first surface and a second connection portion on a second surface opposite to the first surface, the first connection portion and the second connection portion being electrically connected to each other; an analog block having a third connection portion, the third connection portion being connected to the first connection portion of the first circuit board; a second circuit board having a fourth connection portion, the fourth connection portion being connected to the second connection portion of the first circuit board; Equipped with A position of the first connection portion and a position of the second connection portion are different in a planar perspective view, the analog block has an opposing surface that faces the first surface of the first circuit board and that includes at least a portion of the second connection portion and the fourth connection portion in a planar perspective view, and the opposing surface has a protruding portion that protrudes toward the first circuit board. Electronic module.

2. The second connection portion includes a plurality of second connection portions, The second connection portions are arranged in groups of a plurality of pieces. The electronic module of claim 1 .

3. the first circuit board has a first through hole; the second circuit board has a second through hole; the analog block has a support extending from the opposing surface; The support is inserted into the first through hole and the second through hole. The electronic module of claim 1 .

4. The support has a screw hole along an extending direction, the first circuit board, the second circuit board, and the analog block are fixed to one another by screws screwed into the screw holes.

4. The electronic module of claim 3.

5. the first circuit board has a plurality of the second connection portions, The plurality of second connection portions are arranged in a ring shape or a circular arc shape around the first through hole.

4. The electronic module of claim 3.

6. The protrusion extends between the two posts in a plan view, the first circuit board has a plurality of the second connection portions, The plurality of second connection portions are arranged in a line or band shape along the protruding portion.

5. The electronic module of claim 4.

7. The electronic module of claim 2 further comprising an interconnect between the second connection portion of the first circuit board and the fourth connection portion of the second circuit board.

8. The analog block includes a plurality of the pillars, The electronic module of claim 3 , wherein the posts are distributed.

9. The electronic module according to claim 8 , wherein the plurality of support posts are positioned in a circular shape between a center and an edge of the second circuit board in a plan view.

10. The electronic module according to claim 1 , further comprising a battery receiving portion located on a fourth surface opposite to a third surface on which the third connection portion of the second circuit board is located.

11. the housing portion has an insertion opening through which the battery can be inserted and removed in a certain direction along the fourth surface, The electronic components protruding from the fourth surface are not positioned in a range that would prevent the battery from being inserted or removed through the insertion opening.

11. The electronic module of claim 10.

12. a first circuit board having a first connection portion on a first surface and a second connection portion on a second surface opposite to the first surface, the first connection portion and the second connection portion being electrically connected to each other; an analog block having a third connection portion, the third connection portion being connected to the first connection portion of the first circuit board; a second circuit board having a fourth connection portion, the fourth connection portion being connected to the second connection portion of the first circuit board; Equipped with A position of the first connection portion and a position of the second connection portion are different in a planar perspective view, the first circuit board has a light receiving element that detects light incident from the analog block side; The second circuit board has a control unit that executes a process based on a detection result by the light receiving element. Electronic module.

13. An electronic device comprising the electronic module according to any one of claims 1 to 12.

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