JPH032435B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a modular structure of an electronic wristwatch equipped with a digital display device and a pointer drive mechanism.

2. Description of the Related Art Conventionally, as a module structure of an electronic wristwatch equipped with a digital display device and a pointer drive mechanism (hereinafter referred to as an analog movement), one constructed as shown in FIG. 1, for example, is known. That is, a housing 2 installed inside the watch case 1 has a mounting hole 4 into which the digital display device 3 is mounted.
and a housing hole 6 in which the analog movement 5 is housed are formed in the housing 2, respectively. Further, after storing the analog movement 5 in the storage hole 6 from above, the dial 11 is placed from above. Furthermore, the housing 2 is turned upside down, the digital display device 3 is mounted in the mounting hole 4, and the circuit board 7, the main plate 8, etc. are mounted from above, spanning the upper surfaces of the digital display device 3 and the analog movement 5. , fixing screw 9... Furthermore, when attaching the housing 2 to the watch case 1, a magnetic shield frame 10 is provided between the housing 2 and the watch case 1, and the magnetic shield frame 10 prevents the analog movement 5 from being influenced by external magnetism. It's summery.

However, in the modular structure of the electronic wristwatch as described above, after the analog movement 5 is attached to the housing 2, the housing 2 is turned upside down and the circuit board 7, main plate 8, etc. are attached from above. Therefore, dust may enter the analog movement 5 during its installation, resulting in a disadvantage that the function of the analog movement 5 may deteriorate or, in severe cases, may stop working. Further, since the circuit board 7 is provided over the entire lower surface of the digital display device 3 and the analog movement 5, the housing 2 becomes thick, making it difficult to reduce the thickness and size of the housing 2.

This invention was made in consideration of the above points, and its purpose is to prevent dust from entering the analog movement during assembly,
To provide a modular structure of an electronic wristwatch that can operate the function of an analog movement for a long period of time, prevent a circuit board from overlapping with the analog movement, and can be made thinner and smaller.

Hereinafter, one embodiment of the present invention will be specifically described based on FIGS. 2 to 6. In the figure, 20 is an upper housing of the electronic wristwatch, and as shown in FIG. 5, it is formed into a flat plate shape. The upper housing 20 is provided with a mounting section 22 for mounting a liquid crystal display device 21 and a storage section 24 for storing an analog movement 23. The mounting portion 22 is a hole through which the upper housing 20 passes, and the liquid crystal display device 21 is inserted and placed from below. Further, the storage section 24 includes a fifth storage section 24.
As shown in the figure, the upper housing 20 is formed into a concave portion having a bottom portion 25 slightly protruding downward from the lower surface of the upper housing 20, into which an analog movement 23 is inserted and housed from above. In this case, the liquid crystal display device 2 of the storage section 24
Bottom part 25 in the first side part (left part in Fig. 3)
By cutting out the side wall portion, an opening 26 is formed in this portion. This opening 26
communicates with the lower part of the upper housing 20 and the inside of the storage section 24, and exposes the flexible printed circuit board 27 of the analog movement 23 to the lower part of the upper housing 20.

Further, a circuit board 28 is arranged on the lower surface of the upper housing 20 as shown in FIG. The liquid crystal display device 21 mounted in the mounting portion 22 is electrically connected to the left upper surface of the circuit board 28 via interconnectors 29 , 29 . Further, the storage section 24 is located on the right side of the circuit board 28.
An opening 30 is formed through which the bottom portion 25 of the opening 30 is inserted and projects downward. Furthermore, a portion of the edge of the opening 30 of the circuit board 28 passes through the opening 26 of the housing section 24 and is in contact with the flexible printed circuit board 27 of the analog movement 23 housed within the housing section 24 . The flexible printed circuit board 27 and the circuit board 28 that have come into contact with each other are
Two bolts 31, 3 as shown in Fig.
1 and nuts 32, 32, and are electrically connected to each other. In this case, the flexible printed circuit board 27 is connected to the analog movement 2 through the coil winding core 23a.
It is electrically connected to the coil 23b of No. 3.

Further, a magnetic shielding frame 33 is attached to the outer peripheral edge of the bottom portion 25 of the storage portion 24 . This magnetic shield frame 3
3 prevents the analog movement 23 from being influenced by external magnetism, and its shape has an "L" shape in cross section as shown in FIG. It is provided on the outer peripheral edge excluding the edges, and an engaging protrusion 33a is formed at one end thereof to protrude upward. This engagement protrusion 33
a is a locking hole 2 formed in the bottom 25 of the storage section 24;
The magnetic shield frame 33 is attached to the bottom part 25 by inserting it into the bottom part 5a.

Further, a lower housing 34 is arranged on the lower surface of the circuit board 28, as shown in FIG.
This lower housing 34 has an insertion hole 35 into which the bottom 25 of the storage portion 24 and the magnetic shield frame 33 are inserted.
and a battery accommodating portion 37 for accommodating the battery 36. Further, the lower housing 34 is attached to the lower part of the upper housing 20 via the circuit board 28 by a base plate 38. That is, the base plate 38 is a thin metal plate disposed at the lower part of the lower housing 34, both ends of which are bent upward, and engagement holes 38a, 38 are formed in the bent upper end.
a, and the above-mentioned engagement hole 38
The lower housing 34 and the circuit board 28 are attached to the lower portion of the upper housing 20 by engaging the locking protrusions 20a, 20a provided on the side wall of the upper housing 20.

Further, a dial 39 is arranged on the upper housing 20. This dial plate 39 has openings formed at locations corresponding to the liquid crystal display device 21 and the pointer axis of the analog movement 23, respectively, and two foot pins 40, 40 are provided on the lower surface of the dial plate 39.
(one not shown) is provided as shown in FIG. 6A. Of these two foot pins 40, 40, one foot pin 40 is fitted into a first elongated hole 41 formed in the upper right corner of the upper housing 20, and the other foot pin 40 is The foot pin 40 fits into a second elongated hole 42 formed in the lower left corner of the upper housing 20, thereby causing the upper housing 20 to
A dial 39 is attached on top. In this case, the first long hole 41 is formed into a horizontally long elliptical hole, as shown in FIGS. 2 and 6B, and one foot pin 40 is attached to the upper hole edge. A drawing taper portion 41a is formed. Further, as shown in FIGS. 2 and 6C, the second elongated hole 42 is formed to be long in the vertical direction, and a tapered portion 42a for drawing in the other foot pin 40 is formed at the upper hole edge. has been done. Furthermore, slit-like elongated holes 43, 43 are formed near both sides of the second elongated hole 42 along its longitudinal direction.
These holes 43, 43 form elastic walls 44, 44 between them and the elongated hole 42. The elastic walls 44, 44 are each elastically deformed in the lateral direction. Therefore, if one of the leg pins 40 is inserted into the first elongated hole 41 and the other leg pin 40 is inserted into the second elongated hole 42, the dial 39 will not wobble on the upper housing 20. It is fixed without any problem.

Note that 45 in the figure is an electronic component such as an LSI mounted on the circuit board 28.

According to the modular structure of the electronic wristwatch constructed in this manner, the storage section 24 for storing the analog movement 23 is formed in the shape of a concave portion having a bottom portion 25, so that after the analog movement 23 is stored in the storage section 24, By inverting the upper housing 20 and attaching the circuit board 28 and the magnetic shielding frame 33 to its upper surface, it is possible to reliably prevent dust and the like from entering the analog movement 23, thereby improving the functions of the analog movement 23. can be maintained in good condition over a long period of time, and the quality of the electronic wristwatch can be improved.

Furthermore, since the storage section 24 is formed in a concave shape having a bottom portion 25 that protrudes downward from the upper housing 20, the magnetic shield frame 33 can be attached to the protruding bottom portion 25, so that the magnetic shield frame 33 can be attached easily. This makes it possible to perform the installation work easily and efficiently.

Further, since the circuit board 28 can be attached to the lower surface of the upper housing 20 in line with the bottom portion 25 protruding downward of the upper housing 20, the electronic wristwatch can be made thinner and smaller.

Further, in the above embodiment, since the first elongated hole 41 and the second elongated hole 42 are formed in the upper housing 20 to be long in orthogonal directions, the leg pins 40 and 40 of the dial plate 39 are inserted into the upper housing 20, respectively. Just do the dial 3
9 onto the upper housing 20 without wobbling.
It can be installed easily and well.

Although the liquid crystal display device 21 is used as the display device in the above embodiment, the present invention is not limited to this, and a digital display device such as an electrochromic display device may be used.

As explained above, the module structure of the electronic wristwatch according to the present invention includes a liquid crystal display device 21, a pointer drive mechanism 23, a flat plate portion in which a mounting hole 22 in which the liquid crystal display device is disposed, and this flat plate portion. A housing 20 made of synthetic resin has a side wall portion 24 that protrudes downward from the bottom, has an opening 26 formed in a portion thereof, and houses the pointer drive mechanism 23 inside, and a lower surface of the flat plate portion of the housing. an opening 30 disposed through which the side wall of the housing is inserted, and an opening 26 in the side wall.
a circuit board 28 having an end disposed in the mounting hole; a first connector 29 for electrically connecting the circuit board and the liquid crystal display device disposed in the mounting hole; and a first connector 29 for electrically connecting the circuit board and the pointer drive mechanism. Since it is equipped with a second connector 27 that is electrically connected through the opening, a circuit board can be attached in line with the pointer mechanism, and the advantage is that the electronic wristwatch can be made thinner and smaller. There is.

[Brief explanation of drawings]

FIG. 1 is a schematic sectional view of the module structure of a conventional electronic wristwatch, FIGS. 2 to 6 show the module structure of the electronic wristwatch according to the present invention, FIG. 2 is a plan view of its upper housing, and FIG. That's that-
Figure 4 is a cross-sectional view of the main parts, Figure 5 is an exploded perspective view of the main parts of the upper housing, circuit board, and magnetic shield frame, Figure 6 is an enlarged view of the main parts of the dial, Figure 6 B is a sectional view taken along the line AA in FIG. 2, and FIG. 6C is a sectional view taken along the line BB in FIG. 20... Upper housing, 21... Liquid crystal display device, 22... Mounting section, 23... Analog movement, 24... Storage section, 25... Bottom, 28...
circuit board.

Claims (1)

[Scope of Claims] 1. A liquid crystal display device, a pointer drive mechanism, a flat plate portion in which a mounting hole for disposing the liquid crystal display device is formed, and an opening formed in a part of the flat plate portion that protrudes downward from the flat plate portion. a housing made of synthetic resin having a side wall portion housing the pointer drive mechanism therein; an opening disposed on the lower surface of the flat plate portion of the housing through which the side wall portion of the housing is inserted; a circuit board having an end disposed in the opening of the side wall; a first connector electrically connecting the circuit board and the liquid crystal display device disposed in the mounting hole; and a first connector for electrically connecting the circuit board and the liquid crystal display device disposed in the mounting hole; and a second connector for electrically connecting the mechanism to the mechanism through the opening.