JPS6324657Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a circuit unit in which a crystal resonator, a trimmer capacitor, and an integrated circuit are mounted in a dual in-line package type.

There are examples of conventional circuit units in which a crystal resonator, a trimmer capacitor, and an integrated circuit are mounted in an integrated container, but all of them have had problems in terms of miniaturization, thinning, and adjustment.

The present invention provides a circuit unit that is improved in terms of size, thickness, and adjustment, and an embodiment thereof is shown in FIG. FIG. 1A is a plan view, B is a front sectional view, and FIG. 1C is a front view.

In FIG. 1, a dual in-line package type circuit unit 1 is shown. The package is transfer formed. Transfer forming means plastic injection molding, as described in, for example, the McGraw-Hill Dictionary of Scientific and Technical Terms (March 20, 1970, Nikkan Kogyo Shimbun). It is also called transfer molding. Circuit unit 1
After being electrically connected and fixed to the lead frame 2, the integrated circuit 3 is molded into the package by transfer molding of resin, and the recess 4 formed at the same time as the transfer molding is placed in the container. A sealed crystal resonator 5 and a trimmer capacitor 6 are accommodated, and the crystal resonator 5 is arranged at a position where the lead frame 2 crosses the container 7 in cross section.
The lead 15 is electrically connected without bending the lead 15, the trimmer capacitor 6 is electrically connected to the lead frame 2 at a right angle to the adjustment shaft 8, and the recess 4 is sealed by the lid 9. .

If the crystal resonator 5 and the integrated circuit 3 are transfer-molded with resin at the same time (not shown), the lid 9 may have a shape that seals the recess that accommodates only the trimmer capacitor 6.

If moisture resistance is required for the product, the recess, that is, the recess containing the crystal resonator and trimmer capacitor, is filled with an insulating resin.
Furthermore, it is sealed with a lid.

Although the crystal resonator has a cylindrical case or a flat case, this example uses a cylindrical case.

As shown in this example, by providing the integrated circuit 3 and the trimmer capacitor 6 facing each other, it is possible to achieve a smaller size and thinner structure than when they are provided on the same surface.

Further, by connecting and fixing the crystal resonator 5 to the lead frame 2 so as to cross the container 7 in cross section, it is possible to achieve a smaller size and thinner structure.

Further, in addition to the trimmer capacitor 6, a temperature correction capacitor may be used if necessary.

The lid 9 that seals the recess 4 that accommodates the crystal resonator 5 and the trimmer capacitor 6 is made of transparent glass or opaque glass, or a material such as an aluminum plate or a plastic plate, depending on the configuration of the product.

The sealing may be done with adhesive or screws. Fixing with screws allows the lid to be removed, which is useful for repairs, etc.

Furthermore, if a hole 10 is made in a part of the lid body, adjustment can be easily performed from the outside.

Note that when mounting the crystal resonator 5 and trimmer capacitor 6, the holes 11 and 1 shown in FIG.
2 and transfer molding the resin is used. As shown in Figure 1, when the resin is transfer molded leaving the recess 4,
This makes it difficult to connect the crystal resonator 5 and trimmer capacitor 6 to the lead frame 2 with solder or the like. By providing the holes 11 and 12 of this example, stable heating (heat) pressure connection between the recess 4 and the holes 11 and 12 can be made from both the front and back sides. After the connection is completed, the holes 11 and 12 are sealed with an insulating resin (eg, epoxy resin).

As described above, according to the present invention, the crystal resonator is placed at a position where the lead frame crosses the crystal resonator container cross-sectionally, and the crystal resonator and the integrated circuit are placed offset in a plane, so that the thickness is reduced. It is possible to provide a small and thin circuit unit that is slightly thicker than the thickest crystal resonator.

Furthermore, the trimmer capacitor is placed in the recess, the lead frame and the adjustment shaft of the trimmer capacitor are electrically connected and fixed at a right angle position, and the trimmer capacitor is sealed in the lid, making it easy to adjust the frequency of the circuit unit. In addition, when making adjustments, the integrated circuit, crystal oscillator, and trimmer capacitor are all integrated, so final frequency adjustments can be made as is, and the frequency can be adjusted to an accurate value.

In addition, the leads of the lead frame and crystal resonator are electrically connected and fixed without bending the leads of the crystal resonator, so there is no need for bending, and the bent crystal resonator needs to be sorted from front to back. In addition, positioning is required during connection, which increases the number of processing steps and increases the cost, but since both are unnecessary, a low-cost circuit unit can be achieved.

Since the crystal resonator is sealed in a container, it has excellent environmental resistance.

Furthermore, if the circuit unit of the present invention is used in a clock, etc., it will be possible to make it even smaller and thinner.Furthermore, for example, if a hole is made in the lid body, it will be possible to remove external light by opening the back lid of the watch. Since adjustment is easy, the applications of conventional circuit units can be further expanded.

[Brief explanation of the drawing]

FIG. 1 shows an embodiment of the present invention in a plan view, a front sectional view, and a front view. 1...Circuit unit, 2...Lead frame,
3... integrated circuit, 4... recess, 5... crystal oscillator, 6... trimmer capacitor, 7... container,
8...adjustment shaft, 9...lid body, 10...hole. FIG. 2 shows another embodiment in a front sectional view and a bottom view. 11...hole, 12...hole, 15...lead.

Claims (1)

[Claims for Utility Model Registration] In a dual in-line package type circuit unit in which the package is made by transfer molding of resin, the package includes a part for molding an integrated circuit that is electrically connected and fixed to a lead frame, and a part for molding an integrated circuit that is electrically connected and fixed to a lead frame. The recess is formed during transfer molding and has a recess in which the lead frame is exposed in one part and accommodates a crystal resonator and a trimmer capacitor sealed in a container, and is disposed offset from the integrated circuit in a plane. The crystal resonator is arranged so that its longitudinal direction runs along the lead frame, and the lead frame is arranged at a position where it crosses the end face of the crystal resonator, and the crystal resonator can vibrate without bending the leads of the crystal resonator. The trimmer capacitor is electrically connected and fixed to the lead frame with an adjustment axis of the trimmer capacitor perpendicular to the lead frame. A circuit unit further characterized in that the recess that accommodates the crystal resonator and the trimmer capacitor is sealed with a lid.