FR2463438A1 - METHOD FOR MANUFACTURING A COMPLETE MODULE FOR AN ELECTRONIC WATCH, AND MOUNTING CIRCUITS PRODUCED ACCORDING TO SAID METHOD - Google Patents

Abstract

PROCESS FOR MAKING A MODULE. FIRST PLACE AT LEAST THE INTEGRATED CIRCUIT ON A CONDUCTIVE FRAME AND WE MAKE THE CONTACTS, A DETERMINED PART OF THE CONDUCTIVE FRAME IS COATED WITH PLASTIC, A SECOND BOX 4 IN WHICH THE OSCILLATOR QUARTZ IS MOUNTED AND WHICH IS PARTIALLY CONSISTED IN BY A SUBSTANCE 5 ALLOWING LIGHT TO PASS, PLACED ON THE PARTS OF THE CONDUCTIVE FRAME 1 WHICH ARE NOT COATED WITH PLASTIC MATERIAL, THE QUARTZ IS MOUNTED SO AS TO BE ACCESSIBLE FROM THE EXTERIOR TO THE LIGHT RAYS, IT IS ADJUSTED TO TERMINATE, AT MEANS OF A COHERENT LIGHT BY DEFINED VAPORIZATION OF A METAL LAYER APPLIED TO THE SURFACE OF THE QUARTZ.

Description

The invention relates to a method for manufacturing a complete module for a

  electronic watch with at least one integrated circuit and an oscillator quartz in a common casing, in which at least the integrated circuit is first placed on a suitable conducting frame and the contacts are made and then embedded in the plastic

  part of the conductelur framework including the cir-

cooked integrated.

  Such a process is already known from German Patent Application No. 26 20 861. In addition to the integrated circuit and quartz oscillator, it is placed and fixed on the frame

  conduct other electronic elements, such as conden-

  sizers, or adjustable capacitors. The price of manufacture

  such a watch module, however, strongly depends on the

  necessary elements that must be attached to the driver frame. Another disadvantage of the watch module manufactured according to the method of the patent application mentioned above is the need to adjust the frequency of the oscillator by drawing the quartz by means of an adjustable capacitor, on the desired frequency, when the manufacturing operation is completed. Another disadvantage is that at least the adjustable capacitor must remain

  mechanically accessible until the end of the frequency adjustment

  consequently, it is subject to the influence of the environment which can have a considerable effect on

  the long-lasting stability of this element.

  The object of the invention is to indicate a method for manufacturing a complete module for an electronic watch, which significantly simplifies the manufacturing procedure by reducing the number of nieces to be fixed on the conductive frame and thus lowers the cost of manufacture . In addition, it must be possible to simplify the operation of adjusting the module

  and if possible to perform it by a complete process.

  automatically. In addition, it must be possible to minimize deterioration or modification of the elements

  over a long period, caused by external influences

  during or after manufacture.

  This object is achieved in that a second casing, in which the quartz oscillator is mounted and which is constituted at least partially by a transparent substance, is placed in such a way on the parts of the conductive frame which are not coated with plastics material. and that the quartz oscillator is mounted in such a way that it is ac-

  transferable from the outside to the light rays, and that it is

  Finally, by means of a coherent light, a definite vaporization of a metallic layer applied to

the surface of the quartz.

  A variant is that we place on the bowl-

  above the quartz oscillator, a light-transmitting window so that the quartz oscillator is accessible to the light rays from the outside, and is finally adjusted by means of a coherent light, by defined vaporization of a metal layer applied to

the surface of the quartz.

  The invention will be well understood on reading the

  detailed description, given below as an example

  only, a preferred embodiment, shown schematically in the drawing, in which:

  FIG. 1 represents an exemplary conductive frame

  and the elements that must be attached to them, in view from above;

  FIG. 2 is a view from above of a ter-

mined -

  Figure 3 is a longitudinal section through a completed module along the line III-III of Figure 2; Figure 4 is an elevational view of the narrow side

of the completed module.

  In Fig. 1, reference numeral 1 denotes a conductive frame which is cut to a suitable shape in a metal plate or sheet and which serves as a basis for circuit mounting for a complete module for an electronic watch. This conductive frame 1 is fixed to the various electronic elements. Reference 2 designates an integrated circuit which is connected to the conductive frame 1 by

  3. A box 4 with a window

  5, in which a quartz oscillator 6 is mounted, is

  fixed on parts 7 of the conductor frame 1 and is connected thereto.

  The dashed line 8 indicates the perimeter of the 9 common box

  integrated circuit 2 and quartz oscillator 6.

  Figure 2 represents a top view of a module

  completed. The second boti: er 4 thus indicated, with the window

  5, is mounted in a recess 10 of the common casing 9. Specific parts of the conductive frame I are removed, so that the remaining parts outside the casing 9 can be used as connectors 11 for the module, after having been bent sensibly at right angles. In a preferred embodiment, the dimensions of the casing 9 and the portions of the conductive frame 1 used as connectors 11 are such that they correspond to those of a Dual-Inline casing. The recess 12 in the box 9

  used to identify the connections of the module, as it is

age with boltiersDIL.

  FIG. 3 is a longitudinal section through the module along line TII-111 of FIG. 2. On the right side, there is the second casing 4 with the window and the built-in oscillator quartz 6, above the driver frame 1. On the left side are represented the circuit

  integrated 2 and the recess 12 of the box 9.

  FIG. 4 is a side view of the same module with the conductive frame 1, which is cast in the box 9 with

the recess 12.

  2. Another solution is that the quartz bone

  6, is placed directly on parts 7 of the

  1 and that it is connected, without being mounted in a second casing 4, In a preferred embodiment, to protect the quartz against external influences, can be placed in the lvidment 10 of the common box 9 a window 5 letting pass the light so that the quartz 6 remains

  accessible in the light of ex ier.

  In the manufacture of a preferred embodiment of the complete moldule according to the invention for an electronic watch,

  the adhesive circuit is first placed, for example

  2 on the conductive frame 1 into a suitable substance, cut from a plate or a metal plate. The contacts of the integrated circuit 2 are then made by appropriate means, for example by "bonding" and connected to the

  conductor frame 1 through appropriate conduits 3.

  Then part of the driver's frame 1, with the circuit

  integrated 2, except for the part on which will be

  quartz 6 and parts planned as

  cords for the finished module, are coated with a suitable plastic material, so that the housing 9, with the exception of the recess 10 for the second casing 4, has a shape and

  dimensions corresponding to those of a usual DIL box.

  Then, the second casing 4 in which the quartz oscillator 6 is mounted, is mounted in the recess 10 of the casing 9 of

  so that the window 5 in the second housing 4 is accessible

  ble from the outside. In a preferred embodiment, the electrical connection of the quartz 6 with the conducting frame 1, and

  at the same time fixing the second box 4 in the

  10 are made in such a way that the quartz connections 6 are formed as suitably shaped contact surfaces on the side of the second housing 4 opposite to

  window 6, and that they are glued to the corresponding parts

  of the conductive frame 1 with a conductive adhesive of

  lectricity. After mounting the module, the assembly described is

  set to a certain frequency. Preferably, in connection

  both the appropriate connections, we put the module in a state of darkness

  tion, and by means of a laser, it is sprayed into an op-

  fully automatic, through the window 5 a portion of a metal layer applied to the quartz 6, which does not need to be identical to the electrodes, until the assembly operates at the determined frequency. The accuracy of this setting is less than 5 x 10, preferably it is between 1 and 3 x 10 6. Then, the module is ready for operation and can without retouching and without adjustment being

  mounted in a corresponding watch.

  The decisive advantage of the process indicated above is that it is sufficient to fix a total of two elements on the conductive frame 1, namely the integrated circuit 2 and the second casing 4 with the built-in quartz 6. element determining the frequency, that is to say the quartz

  oscillator 6 is mounted in the pre-manufacturing process

  in a hermetically sealed box, so that it is practically impossible for it to be damaged or modified

  external influences during the manufacturing process.

  cation. In addition, for the module described above it is not

  no need for external capacitors, since these

  These are already contained in the integrated circuit. This further simplifies assembly in a watch. Another simplification of the manufacturing process consists in the adjustment of the module using a fully automatic laser and in the speed

  execution of this operation. Overall, we can

  using the process of the invention, a considerable reduction

  the manufacturing costs of watchmaking fixtures.

Claims (5)

  1. A method for manufacturing a complete module for an electronic watch with at least one integrated circuit and a quartz oscillator in a common boStier, according to which at least the integrated circuit is first placed on a conductive frame of appropriate shape and is realized the contacts, then plastic coating a given part of the conductive frame including the printed circuit, characterized in that a second boStier (4) in which is mounted the   quartz oscillator (6) and which is constituted at least partially   a light-transmitting substance (5) is placed on the parts of the conductive frame (1) which are not encased in plastic, that the quartz oscillator (6) is mounted so as to be accessible from the outside. to light rays, and that it is adjusted to finish, by means of a coherent light by defined vaporization of a layer   metal applied to the surface of quartz.   2. A method for manufacturing a complete module for an electronic watch with at least one integrated circuit and a quartz oscillator in a common box, according to which at least the integrated circuit is first placed on a conductive frame of appropriate shape and is realized. the contacts, then plastics a given part of the conductive frame, including the printed circuit, and then the quartz oscillator is placed on the parts of the conductive frame uncoated plastic and contacts are established, characterized in that we place on the box   (9) above the quartz oscillator (6) a window (5)   passing the light, so that the quartz oscillator (6) is accessible from the outside to the light rays, and that: 0 finally, it is set by means of coherent light, by defined vaporization of an applied metal layer sure the surface of the quartz.   3.- Method for making a circuit arrangement   according to any one of claims 1 and 2, characterized   in that a laser is used to adjust the oscillation quartz (6).   4.- Circumculation Mosquing the procedure of one   any of the preceding claims, characterized in that   oscillating quartz (6) is a diapason quartz which can   be made according to the usual technique of attack.   55.- Circuit arrangement according to the method of any one of the preceding claims, characterized in that all the capacitors necessary for the operation of the   mounting are integrated in the integrated circuit (2).