JPS6231906Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a small electronic device with a sound alarm function.

For example, in an electronic wristwatch with a sound alarm function, the first
As shown in the figure, a sounding unit has a sounding body such as a piezoelectric buzzer installed inside a resonance box A which has a circular shape that matches the shape of the sounding body and has a sound emitting tube B at a peripheral edge position eccentric to the center of the circle. I have something prepared. In a wristwatch with a sound alarm function, as shown in Fig. 2a, a sound emitting port E is formed at the periphery of the upper wall of the watch case C, avoiding the display window D, and when the above sounding unit is used, Since the sound emitting tube B is located on the periphery of the resonance box A, the resonance box A can be placed closer to the inner periphery of the watch case C without requiring a large arrangement space for the resonance box on the periphery of the watch case C. There are advantages.

Therefore, the above-mentioned sounding unit is connected to the watch case C.
When storing it in the housing of, for example, a clock module provided inside, a circular storage part sized to match the resonance box A is formed in the housing, and the resonance box A is inserted into this storage part. . However, during assembly work, it is necessary to position the sound emitting tube B so that it faces the sound emitting port E of the watch case C and store the resonance box A, but both the resonance box A and the storage part have a circular shape. Since the resonance box A rotates freely within the storage compartment, it is difficult to align the positions of the sound emitting tube B and the sound emitting port E, and as shown in Figure 2b, the sound emitting tube B is aligned with the sound emitting port C. There is a problem in that the assembly work is very troublesome because positional deviation is likely to occur.

The present invention has been developed in view of the above-mentioned circumstances, and it is possible to easily position the sound generating unit in the rotational direction, which has a sound emitting tube at an eccentric position with respect to the circular body, and also to easily and reliably waterproof the sound emitting unit. The purpose is to provide small electronic devices with functions.

Embodiments of the present invention will be described below with reference to drawings.

3 to 6 show an embodiment in which the present invention is applied to an electronic wristwatch with a sound alarm function. 1 in the diagram
1 is a metal watch case, and the upper part of the watch case 1 has a display window 2 fitted with a window glass 3, and the lower open part of the watch case 1 has a metal back cover 4.
is screwed on. A sound emitting port 5 consisting of a plurality of slits passing through the inside and outside of the case is formed in the upper wall peripheral portion of the watch case 1, and a perforated decorative plate 6 is fitted into the upper part of the sound emitting port 5. be. A watch module is provided inside the watch case 1. In the figure, reference numeral 7 denotes the housing of the watch module, and the upper part of the housing 7 is formed with an upper storage recess 7a for storing the display panel 8, wiring board 9, etc., and the lower part of the housing 7 is for storing the display panel 8, wiring board 9, etc. Button type battery 1
0, and a vibrator housing part 7c to house the crystal resonator 11 attached to the lower surface of the wiring board 9. Further, the housing 7 is formed with a sounding unit housing portion 7d which is substantially circular in plan view.

A wiring board 9 is attached to the upper housing recess 7a, and an inner frame 12 made of synthetic resin is attached above the wiring board 9, and a display panel 8 and a reflective surface are formed on the back side of the inner frame 12. A diffusion plate 26 is attached. The display panel 8 is a liquid crystal display panel having a structure in which a liquid crystal element is sealed between three substrates, and flanges 8a, 8a are formed on both sides along the longitudinal direction of the display panel 8. Output terminals (not shown) are formed on the back surfaces of the portions 8a, 8a. Further, holding pieces 12a, 12a for holding the display panel 8 and the diffusion plate 13 are formed on both sides of the middle frame 12 along the width direction.
Moreover, an interconnector holding portion 12b into which the interconnector 13 is inserted is provided on one side in the longitudinal direction of the middle frame 12.
is formed, and an interconnector 13 is formed on the other side.
A notch 12c is formed for positioning. Further, the wiring board 9 has a substantially rectangular shape when viewed from above, and covers the circular sounding unit housing portion 7d.
Also, a semicircular protrusion 9a having an arcuate notch is formed protrudingly. On the upper surface of this wiring board 9, an LSI 14 is attached in the center, and connection terminals 15, 15 are provided on both sides along the longitudinal direction to be electrically connected to lead-out terminals of the display panel 8. An illumination lamp 16 is attached to the upper surface of the circular protrusion 9a. On the other hand, a crystal resonator 11 is attached to the upper surface of the wiring board 9.

Further, a housing 7 is provided below the wiring board 9.
A one-side electrode terminal plate 17 of the battery 10 is provided in the battery storage section 7b provided in the battery compartment 7b. An insulating sheet 18 made of synthetic resin is attached to the electrode terminal plate 17 to prevent a short circuit between one electrode surface of the battery 10 and the pattern of the wiring board 9. Electrode terminal plate 1
Reference numeral 7 denotes a flat plate portion 17a, and a connecting piece 1 extending from the center of one end of the flat plate portion 17a, bent toward the wiring board 9, and connected to a connecting terminal of the wiring board 9.
7b, and an electrode piece 17c extending from both sides of one end of the flat plate part 12a, connected at the tip, and bent in the direction of the battery 10 to contact one side electrode of the battery.
A first positioning piece 17d formed at the center of the other end of the flat plate part 12a and bent downward; and a pair of positioning pieces bent downward from both sides of the other end of the flat plate part 7a. 17e, 17e. Further, the insulating sheet 18 attached to the electrode terminal plate 17 has a mounting part 18a formed at its peripheral edge for attaching the terminal plate 17, and a first positioning piece 17d is inserted into the center of the mounting part 18a. An insertion hole 18b is formed therein, and notches 18c, 18c for positioning a pair of second positioning pieces 17e, 17e are formed on both sides. Furthermore, an insertion hole 18d is formed in the insulating plate 18 near the mounting portion 18a, through which the electrode piece 17c is inserted. Thus, in the electrode terminal plate 17, the electrode piece 17c is inserted into the hole 18d from above, and the first positioning piece 17d is inserted into the insertion hole 18b.
Then, the second positioning pieces 17e, 17e are positioned in the cutouts 18c, 18c of the insulating sheet 18, and the pair of positioning pieces 17e, 17e are used to position the insulating sheet 18.
They are attached so as to sandwich the attachment portion 18a between them.
In this way, the insulating sheet 18 is attached to the electrode terminal plate 1.
7, the insulating sheet 18 can be reliably positioned relative to the electrode terminal plate 17 in the front and rear right directions. Further, three terminal plate mounting holes 7e are formed in the bottom surface of the upper storage recess 7a of the housing 7 near the battery storage section 7b, and positioning pieces 17d, 17e, 17e are press-fitted into the mounting holes 7e. As a result, the electrode terminal plate 17 to which the insulating sheet 18 is attached is fixed to the housing.

Reference numeral 19 denotes a battery holding member which also serves as a + side electrode terminal plate, and this battery holding member 19 is formed in the shape of an elongated plate, and is fixed to the housing 7 with screws at both ends. A pair of elastic pieces 19a and 19b are formed extending vertically on the battery holding member 19, and the elastic piece 19a is in elastic contact with the bottom surface of the battery 10, and the elastic piece 19b is in elastic contact with the metal back cover 4. The metal case 1 and back cover 4 are used as reference potentials. Further, a pressing piece 19c extending upward is formed on the battery holding member 19, and when the battery holding member 19 is fixed to the housing 7, the pressing piece 19c is used to hold the crystal housed in the vibrator storage portion 7c. The vibrator 11 is held under pressure.

Further, a sounding unit 20 is housed in a sounding unit housing portion 7d formed in the housing 7. As shown in FIGS. 6a and 6b, the sounding unit 20 has a sounding body 23 provided inside a resonance box 22 having a sound emitting tube 21. The resonance box 22 is made of synthetic resin, for example, and since the sounding body 23 is circular in order to enhance the sounding effect, it is formed as a box having a circular planar shape to match the shape of the sounding body. A sound emitting tube 21 in the form of a cylinder whose upper and lower ends are open is integrally formed upward at a position _O2 that is eccentric by a predetermined distance with respect to the circular center _O1 of the resonance box 22 in the section. In the embodiment, the outer circumferential line of the sound emitting tube 21 coincides with the outer circumferential line of the resonance box 22. A circular protrusion 24 concentric with the sound emitting tube 16 is integrally formed on the outer periphery of the sound emitting tube 21 at the middle in the height direction, and this protruding portion 24 projects outward from the outer periphery of the resonance box 22. The protrusion 24 has a diameter (that is, a protrusion height from the outer periphery of the sound emitting tube 21), and the portion of the protrusion 24 facing the periphery of the resonance box 22 protrudes outward from the outer periphery of the resonance box 22. When the resonance box 22 is viewed from above, a portion of the protrusion 24 protrudes outward from the circular outer periphery of the resonance box 22 in an arc shape. For example, a piezoelectric buzzer is used as the sounding body 23, and is held and provided inside the resonance box 22. Further, the storage section 7d is formed on the peripheral side of the housing 7 corresponding to the upper surface peripheral portion of the watch case 1 in which the sound emitting port 5 is formed, and has an upper part so that the sound generating unit 20 can be inserted and stored from above. It is an open recess. The housing portion 7d is formed, for example, across the bottom and peripheral wall of the housing 7, and has a depth corresponding to the height of the entire resonance box 22 including the sound emitting tube 21, and the bottom portion _7d1 has a diameter corresponding to the resonance box 22. It has a circular shape. A groove 7d 2 having an arcuate cross section along the vertical direction is formed on the circumferential wall of the housing ₇ , which has an arcuate shape surrounding the upper part of the bottom portion 7d 1 of the storage portion 7d, at a position facing the sound emitting port 5 of the watch case ₁ . It has been formed. This groove _7d2 corresponds to a part of the protrusion 24 protruding from the outer periphery of the resonance box 22. That is, if a circle having the same diameter as the protrusion 24 is drawn centered at a position eccentrically located at the same distance as the sound emitting tube 21 with respect to the circular center of the bottom 7d ₁ , a part of this circle will be drawn from the center of the bottom 7d ₁ . It protrudes outward from the outer periphery, and this protruding portion is formed as a groove _7d2 .
The groove 7d ₂ is open on the upper surface of the peripheral wall of the housing 7 and has a height corresponding to at least the height of the protrusion 24 from the upper surface of the peripheral wall. The resonance box 22 of the sound generating unit 20 is placed in the storage section 7d.
The sound emitting tube 21 is placed in the bottom portion 7d ₁ of the housing 7 surrounded by the circumferential wall of the housing 7, facing the groove 7d ₂ . The protruding portion is inserted into and engaged with the groove _7d2 from above. That is, the resonance box 22
The position of the sound emitting tube 21 is set so that the portion of the protrusion 24 protruding from the outer periphery of the resonance box 22 engages with the groove _7d2 , and the sound emitting tube 21 is stored in the storage portion 7d. In this case, since the position of the sound emitting tube 21 is set to be directly below the sound emitting port 5 of the watch case 1, and the groove 7d ₂ is formed,
Due to the engagement between the protrusion 24 and the groove _7d2 , the sound emitting tube 21 is positioned and fixed in position facing the sound emitting port 5 and directly below it. Further, due to the engagement between the protrusion 24 and the groove 7d ₂ , the resonance box 22 is prevented from rotating in the circumferential direction at the bottom 7d ₁ . Further, a cylindrical gasket 25 is fitted into the upper part of the sound emitting tube 21 and supported by the protrusion 24, and the upper end of this gasket 25 surrounds the sound emitting port 5 and is in close contact with the inner surface of the upper wall of the watch case 1. Thus, the sound emitting port 5 and the inside of the watch case 1 are isolated. Note that the sounding body of the sounding unit 20 is connected to the circuit of the wiring board 9.

Then, when the sounding body 17 of the sounding unit 14 is driven by the signal, the air inside the resonance box 22 vibrates and a sound is generated, and this sound passes through the sound emitting tube 21 and then exits from the sound emitting port 5 of the watch case 1. Released to the outside.

Therefore, when assembling the sounding unit 20 inside the watch case 1 in this electronic wristwatch, the resonance box 22 is inserted into the storage section 7d of the housing 7 from above while the protrusion 24 is inserted into and engaged with the groove 19 from above. As a result, the sound emitting tube 21 is positioned at a position corresponding to the sound emitting port 5 of the watch case 1, and at the same time, the resonance box 22 is prevented from rotating and can be stored in the storage portion 7d.

Note that the protrusion provided on the sound emitting tube of the resonance box may be formed integrally with the sound emitting tube, or may be formed separately and fixed to the sound emitting tube by means such as adhesive. An electromagnetic buzzer can also be used as a sounding element.
The sound generating unit storage section is not limited to the embodiment, and may be formed directly on the device case of a small electronic device, for example. The present invention is applicable not only to electronic wristwatches but also to a wide variety of small electronic devices equipped with a sound alarm function.

As explained above, the small electronic device with a sound reporting function of the present invention is provided with a circular protrusion that partially protrudes from the edge of the resonance box on the eccentric sound emitting tube of the sound generating unit,
This protrusion supports the gasket that is inserted into the sound emitting tube and presses the gasket around the sound emitting port of the case, which not only makes waterproofing easy and reliable, but also allows the sound emitting tube protrusion to resonate. Since the positioning is performed by engaging the arcuate portion projecting from the edge of the box with the groove formed in the side wall of the sound-producing unit accommodating portion of the frame, positioning can be effected with a simple structure.

[Brief explanation of the drawing]

Figure 1 is a perspective view showing a resonance box of a conventional sounding unit, Figures 2a and b are explanatory diagrams showing the positional relationship between the resonance box and the sound emitting port, respectively, and Figure 3 is an embodiment of the present invention. FIG. 4 is an exploded perspective view showing a watch module of the same embodiment; FIG.
The figure is an exploded perspective view showing a part of the timepiece module of the same embodiment, and FIGS. 6a and 6b are a plan view and a sectional view, respectively, showing the resonance box of the sounding unit of the same embodiment. 1...Watch case, 5...Sound emitting port, 7...Housing, 7d...Sound unit storage section, 7d ₂ ...
Groove, 20... Sound generation unit, 22... Resonance box, 2
1...Sound emitting tube, 23...Sounding body, 24...Protrusion,
25...Putskin, A...Resonance box, B...Sound tube, C...Clock case, E...Sound emitting port.

Claims (1)

[Claims for Utility Model Registration] A sounding unit comprising a sounding body disposed inside a resonance box having a circular shape and having a sounding tube located eccentrically with respect to the center of the circle, the sounding tube of the sounding unit In a small electronic device, the sound emitting tube of the sound emitting unit has an upper end. a circular protrusion that protrudes outward and partially protrudes from the circular edge of the resonance box at a predetermined distance from the sound emitting tube; A cylindrical gasket is inserted and the gasket is pressed around the sound emitting port of the case with the protrusion, and when the sound generation unit is inserted into the inner wall of the sound emitting unit housing portion of the frame, the gasket is pressed against the circumference of the circular protrusion. A small electronic device with a sound alarm function, which forms a groove into which an arcuate portion protruding from the edge of a resonance box is inserted and engaged.