JPS5929832B2 - Arrangement structure of electronic components in small electronic devices - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a structure for arranging electronic components in a small electronic device.

2. Description of the Related Art In recent years, electronic wristwatches have been actively developed that digitally display the time on a liquid crystal panel or the like using micro-sized batteries such as silver oxide batteries.

Conventionally, this type of electronic wristwatch has been constructed, for example, as shown in FIGS. 1 and 2, respectively. That is, 1 is the above-mentioned housing, 2 is a lower housing, and the housing of the electronic wristwatch is constituted by the combination of these. A liquid crystal panel 4 for digitally displaying time, date, etc. is fitted into the fitting hole 3 of the housing 1 and is supported by a presser member (not shown). External lead-out terminals of the liquid crystal panel 4 are provided on both sides of the lower surface of the liquid crystal panel 4, and these terminals are connected to a circuit board 6 separately arranged on the lower surface of the liquid crystal panel 4 via an interconnector 5. It is electrically connected to terminal 7. The bottom surface of the circuit board 6 includes an LSI package 8, a crystal resonator 9, a silver oxide battery 10, and a temperature compensation capacitor 1.
1. Electronic components such as a trimmer capacitor 12 are attached. And this crystal oscillator 9, silver oxide battery 10
, the trimmer capacitor 12 is inserted into each receiving hole 13, 14, 15 of the lower housing 2, respectively. Thus, the upper housing 1, the circuit board 6, and the lower housing 2 are fixed with screws or the like (not shown) while the liquid crystal panel 4 and the circuit board 6 are interposed between the terminals of the interconnector 5. It is. However, such conventional LSI packages8,
A circuit board is required to mount the crystal oscillator 9 and other electronic components, as well as to electrically connect each component.
As the number of components increases, the electrical connections of electronic components are made indirectly through pattern wiring on the circuit board, so there is no inconvenience if the pattern wiring is disconnected when installing electronic components. This resulted in unfavorable workability and reliability.

Moreover, since the electronic components are attached to the lower surface of the circuit board 6, that is, in the thickness direction, the thickness increases, which poses a problem in making the circuit board thinner. The present invention has been made in view of the above circumstances, and includes: part (5) a small electronic device that has a small number of parts, allows easy and reliable mounting of electronic components, improves workability and reliability, and can be made particularly thin; This provides a structure for arranging electronic components.

An embodiment in which the present invention is applied to an electronic wristwatch will be described below with reference to FIG.

In FIG. 3, 20 is an upper housing, 21 is a lower housing, and by combining these, the housing of the electronic wristwatch is constructed.

A rectangular fitting hole 22 is provided approximately in the center of the upper housing 20.
is formed. The lower housing 21 has a rectangular fitting hole 23 formed in its approximate center, and a band-shaped accommodation hole 24 formed along one side edge of the fitting hole 23. A circular accommodation hole 2 is provided on the other side edge of the fitting hole 23.
5 is formed. A liquid crystal panel 26 for digitally displaying time, date, etc. is fitted into the fitting hole 22 of the upper housing 20 and supported by panel holding plates 27 attached to both side edges of the fitting hole 22. The liquid crystal panel 26
External lead-out terminals of the liquid crystal panel are provided at intervals on the lower surface portions of both sides. Terminals of the liquid crystal panel 26 are electrically connected to terminals 34 of an LSI package 31, which will be described later, via an interconnector 28. The interconnector 28 is
A large number of linear terminals 30 are arranged at intervals in the longitudinal direction on the outer peripheral surface of the rod 29 made of an elastic insulating material such as rubber.
It is wrapped with Reference numeral 31 denotes a DIP type LSI package that is electrically connected to the liquid crystal panel 26 and other electronic components. It consists of rectangular plate-shaped substrates 32 made of a material such as synthetic expanded fat or ceramic and having approximately the same size.

A stepped portion 33 having a predetermined width, that is, a width corresponding to the width of the interconnector 28, is formed along the entire length on both edges in the longitudinal direction of the rectangular plate-shaped substrate 32, and the liquid crystal display is placed on the upper surface of the stepped portion 33. Terminals 34 are provided corresponding to the terminals of the panel 26 and electrically connected to the LSI chip, and terminals 34 are provided on both sides of the rectangular plate-shaped substrate 32 in the lateral direction, and are electrically connected to the LSI chip. A terminal 35 is provided. Note that the terminal 34 provided on the top surface of one step portion 33
Of these, two predetermined terminals 34a and 34b each extend a predetermined length and are bent into a predetermined shape. 36
is a silver oxide battery, which is disposed near one step 33 of the LS package 31 so as to be located substantially on the same plane as the LSI package 31, and its anode (i.e., the peripheral surface) is connected to the terminal 3.
4a, the cathode (ie, the top) is brought into elastic contact with the terminal 34b, respectively.

Reference numeral 37 denotes a crystal resonator, which is disposed along the other step 33 of the LS package 31 so as to be located substantially on the same plane of the LSI package 31, and its terminals 38 are arranged on the upper surface of the other step 33. Of the provided terminals 34, two predetermined terminals are soldered respectively.

Reference numerals 39 and 40 denote a temperature compensation capacitor and a trimmer capacitor, which are both disposed on the lateral side of the LSL package 31, and the temperature compensation capacitor 39 is connected to the LSL package 31.
The trimmer capacitor 40 is soldered to the upper surface of a predetermined terminal among the terminals 35 of the SI package 31, and to the lower surface of another predetermined terminal among the terminals 35.

When assembling from the disassembled state shown in FIG. 3, electronic components such as the crystal resonator 37 and capacitors 39 and 40 are first soldered and fixed to predetermined terminals of the LS package 31.

Then, the LSI package 31 is fitted into the fitting hole 23 of the lower housing 21 so that the crystal resonator 37 and the silver oxide battery 36 are inserted into the storage holes 24 and 25 of the lower housing 21, respectively. At this time, the bottom surface of the LSI package 31 in the lateral direction is locked by step portions 41 formed on both sides of the fitting hole 23 in the lateral direction. The upper housing 20 and the lower housing 21 are then assembled with each other with the external lead-out terminals of the liquid crystal panel 26 being positioned so as to contact the terminals 34 on both sides of the LSI package 31 via the interconnector 28. At this time, the liquid crystal panel 26 is fitted into the fitting hole 22 of the upper housing 20 and supported by the panel holding plate 27.

In this way, it is not necessary to provide a special circuit board for attaching electronic components and making electrical connections, and the number of parts is small, which is suitable for workability and mass production. It also has excellent reliability because the electronic components are connected directly to the terminals of the LS package without any connection.

Furthermore, since the electronic components are disposed on the same plane as the LSI package 31, it can be constructed extremely thin. In the above embodiments, the present invention is applied to an electronic wristwatch, but the present invention is not limited to this, and can be widely applied to small electronic calculators without departing from the gist of the present invention. obtain.

As described above, according to the arrangement structure of electronic components according to the present invention, a battery is arranged on one side in the longitudinal direction of an LSI package, a crystal resonator is arranged on the other side, and a crystal resonator is arranged on one side in the lateral direction of the LSI package. Since other components are arranged and each component is connected to a terminal extending horizontally from the peripheral side of the LSI package, a circuit board is not required and the number of components can be reduced. Not only is it suitable for workability and mass production, but it is also highly reliable because it is not connected indirectly through pattern wiring or the like.

Furthermore, instead of arranging electronic components in the thickness direction, LSI
Since it is disposed on the peripheral side of the package, this type of electronic device can be manufactured thin.

[Brief explanation of drawings]

FIGS. 1 and 2 are an exploded perspective view of the main parts of a conventional electronic wristwatch and an exploded perspective view of a part thereof as seen from the bottom, respectively, and FIG. 3 shows an embodiment in which the present invention is applied to an electronic wristwatch. FIG. 26...Liquid crystal panel, 28...Isota connector, 31...LSI package, 36...
...Silver oxide battery, 37...Crystal resonator,
39...Temperature compensation capacitor, 40...
...Trimmer capacitor.

Claims (1)

[Claims] 1. An optical display panel for optical display, an LSI package having a substantially rectangular shape and having lead-out terminals extending horizontally from at least one side in the width direction and both sides in the length direction, and the length of the LSI package. Batteries connected to lead-out terminals arranged side by side on one side in the longitudinal direction and extending from the one side in the longitudinal direction, and batteries arranged in parallel on the other side in the longitudinal direction of the LSI package and extending from the other side in the longitudinal direction. A crystal oscillator is directly fixed to the lead-out terminal formed by the crystal resonator, and a crystal resonator is directly fixed to the lead-out terminal which is arranged in parallel on one side of the LSI package in the transverse direction and extends from the one side in the transverse direction. and an interconnector for electrically connecting a lead-out terminal formed to extend from one of both longitudinal sides of the LSI package and an external lead-out terminal of the optical display panel. Arrangement structure of electronic components in small electronic devices.