CA1099417A

CA1099417A - Substrate plate device having intergrated synthetic resin members

Info

Publication number: CA1099417A
Application number: CA296,985A
Authority: CA
Inventors: Yukio Ikenaga
Original assignee: Polyplastics Co Ltd
Current assignee: Polyplastics Co Ltd
Priority date: 1977-02-17
Filing date: 1978-02-16
Publication date: 1981-04-14
Also published as: GB1593031A; NL7801351A; BE863480A; JPS53113954U; DE2806440A1; IT7820311A0; FR2380862A1; BR7800797A

Abstract

ABSTRACT OF THE DISCLOSURE
A substrate plate device having integrated synthetic resin members is provided by that a synthetic resin member is combined with and secured to a substrate plate integrally at the time of molding thereof by means of a single hole provided in said substrate plate and having a spreading-out shape like an unfolded fan or a plurality of such holes disposed extremely adjacent to one another.

Description

~q9417 BACKGROUND OF THE INVENTION
FIELD OF TXE INVENTION
This invention relates to a substra-te plate device for use in a tape recorder, a radio receiver, a watch and the like which comprises a sub-strate plate of a metal and a synthetic resin member such as a substrate base of a synthetic resin combined with the former integrally with high accuracy.
Various substrate plate devices have been known in the art. Some has the construction wherein a functional member such as a substrate base is secured to a metallic substrate plate by caulking while the other has a sub-strate which is as a whole integrally formed by a synthetic resin material.
In recent years, a so-called "out-sert molded article" has gained a wide application in which a synthetic resin functional member is secured integrally to a metallic substrate plate having proper locking holes at the time of molding of the same. (In this type of device, the relation between the synthetic resin and the metal at the locking portion is opposite to the relation in the conventional "insert-type" device, hence, the device is re-ferred to as an "out-sert" device. For detail of the out-sert molding, refer to "Plastics", Vol. 26, No. 12, pages 52-53).
The present invention relates to a substrate plate device which can be obtained easily by the above mentioned "out-sert" molding process and pro-vides a substrate plate device of high dimensional accuracy having especially a relatively large synthetic resin functional member.
This invention relates to a plate assembly comprising a metallic substrate plate having a member of synthetic plastic material bonded thereon through one or more bonding apertures in the said plate, characterized in that the said bonding aperture or apertures include at least one portion ex-tending towards an edge of the said plate radially from the said bonding aperture, or radially from the centre of a group of such apertures, the said portion or portions having an enlarged width at their outer end.
This invention relates to a plate assembly comprising a metallic , ~, ."

~q941~

substrate plate having a member of synthetic plastic material bonded thereon through one or more bonding apertures in the said plate, characterised in that the said bonding aperture or apertures include at least one portion ex-tending towards an edge of the said plate radially from the said bonding aperture, or radially from the centre of a group of such apertures, the said portion or portions having an enlarged width at their outer end.
Preferred embodiments of the present invention will now be ex-plained with reference to the accompanying drawings.
BRIEF DESCRIPTION OF THE DRAWINGS
Figure 1 is a perspective view of a substrate plate device having a substrate base thereon;
Figures 2, 3 and ~ are plan views showing the conventional sub-strate plates respectivelyj Figure 5 is a cross-sectional view showing the state of shrinkage of a synthetic resin member in the conventional substrate plate device;
Figure 6 is a sectional plan view of the conventional substrate plate device along the surface of the substrate plate thereof;
Figures 7 through 18 illustrate various embodiments in accordance with the present invention wherein Figure 7 is a plan view of an example of the substrate plate according to the present invention; Figure 8 is a plan view showing the state of shrinkage at the locking hole portion in the pres-ent device; Figures 9 through 16 are plan views showing the shapes of the various slit holes of the present device, respectively; Figure 17 is a rear view of an example of the substrate plate which is partially locked on the rear surface thereof; and Figure 18 is a rear view of an example of the sub-strate plate which is locked on the entire rear surface thereof.
DESCRIPTION OF THE PRIOR ARTS
Figure 1 illustrates an outlook of a typical substrate plate de-vice in which a functional member 2 of a base shape is shown disposed and locked on a substrate plate 1. The substrate plate device of this type 9~7 conventionally comprises a substrate plate and a functional member of a syn-thetic resin such as those illustrated in Figures 2 through 4.
In Figure 2, a construction is shown in which locking is effected -at and by means of plural independent holes 3, 4, 5 and 6. The dotted lines in these Figures (and also in the following Figures) indicate the outer cir-cumference of the substrate base secured on the substrate plate respectively.
The above mentioned locking will be generally enhanced and strengthened by the synthetic resin member that has protruded through the holes onto the surface of the substrate plate at the rear surface thereof.
However, explanation on this point will hereinafter be omitted unless re-quired specifically. In the device of this type, the mold shrinkage of the synthetic resin will cause deformation of the substrate plate as shown in Figure 5.
In Figure 5, the reference numeral 9 designates a synthetic resin member; 10 is a substrate platej and 11 is a rear surface locking element of the synthetic resin member.
To cope with this problem of deformation, those deformation-free devices~have also been proposed which have holes 7, 8 for the substrate plate of a circular shape (such as in Figure 3) or a radial shape (such as in Fig-ure 4). However, since the shrinkage of the synthetic resin does not apply any force to the substrate plate in such devices, these devices can solve the problem of deformation, but they yet involve another problem. ~amely, because the substrate plate and the synthetic resin are not secured tightly to each other at the hole portions of the substrate plate after the shrink-age of the synthetic resin, unstableness, dimensional inaccuracy and the like tend to occur therebetween, as shown in Figure 6, wherein the full line 12 indicates the shapes of the hole in the substrate plate as well as of the synthetic resin before the shrinkage, while the dotted line 13 indicates the shape of the synthetic resin after shrinkage.
As mentioned above, there has been no prior art device which can , .~.. ~.~

1~9~17 remove the above defects of deformation and unsteadiness.
SUMMARY AND DETAILED DESCRIPTION OF THE INVENTION
The device in accordance with the present invention is character-ized essentially in that the synthetic resin functional member is secured and locked by means of a single hole provided in the substrate plate and having a spreading-out shape like an unfolded fan or a plurality of such holes dis-posed extremely adjacent to one another.
Figure 7 illustrates an example of the substrate plate in accor-dance with the present invention which has the same outlook as the one illus-trated in Figure 1. In this Figure 7, the reference numeral 14 designates anexample of the above me~tioned hole of the present invention and the dotted line indicates the outer circumference of the synthetic resin member.
In this type of device, the synthetic resin having the shape indi-cated by line 15 at the hole portion will cause shrinkage substantially in like figures as indicated by the dotted line 16 in Figure 8 and will adhere to the substrate plate even after the shrinkage as shown in Figure 8, thereby neither causing unsteadiness nor applying any force to the substrate plate and preventing the deformation, consequently.
In the present device, the fan shape as illustrated in Figure 8 is most preferred. However, in case a certain unsteadiness is allowable, or on the contrary, in case a certain deformation is allowable or the`anisotropic property of the resin is large, various shapes such as shown in Figures 9 to Figure 16 may also be employed within the scope and object of the present in-vention. In other words, these shapes are merely illustrative, and a number of proper shapes can be worked out by combining these shapes or modifying them as desired within the scope of the present invention.
In most of these examples as shown in Figures 9-16, the corner of the hole has been shown sharp. However, it is also preferable to provide the hole having the corners of a smooth curve in order to eliminate a notch effect.

In the present device, the locking element of the synthetic resin protruded through the hole on to the rear surface of the substrate plate for strengthening the lock may be either partial as indicated by the dotted line 17 in Figure 17 or be the whole as indicated by the dotted line 18 in Figure 18.
It is a still preferred embodiment of the present invention to min-imize the unsteadiness by applying a treatment such as bending, corrugation, tapering, surface treatment and so forth to the surface of the substrate plate. Further, a part of the resin existing in the slit hole may be re-moved.
Though the device of the present invention has hereinbefore beendescribed with particular reference to the device having a resin member of a substrate base shape, it can be adapted to various other shapes and conse-quently, is not specifically restricted to the shape described. Furthermore, the device of this invention may be connected to another device via a syn-thetic resin member of a relatively deformable material such as runner and the like, or adapted only to a specific section of a large-sized device.
As explained above, the device of this invention can be used widely -as a component of such products as a watch, electric and electronic appli-ances, toys, etc., and is especially suited for a large-sized synthetic resin body and a precision component.
As the synthetic resin material, crystalline resins such as poly-acetal are especially useful in the present invention. However, other thermoplastic resins and thermosetting resins in general may be used sim-ilarly.

Claims

THE EMBODIMENTS OF THE INVENTION IN WHICH AN EXCLUSIVE
PROPERTY OR PRIVILEGE IS CLAIMED ARE DEFINED AS FOLLOWS:

1. A plate assembly comprising a metallic substrate plate having a member of synthetic plastic material bonded thereon through one or more bonding apertures in the said plate, characterised in that the said bonding aperture or apertures include at least one portion extending towards an edge of the said plate radially from the said bonding aperture, or radially from the centre of a group of such apertures, the said portion or portions having an enlarged width at their outer end.

2. A substrate plate device as claimed in claim 1, wherein said synthetic plastic member is of a substrate base shape.

3. A substrate plate device as claimed in claim 1, wherein said synthetic plastic member protrudes through said aperture or apertures onto the rear surface of said substrate plate to form a locking element on said rear surface.

4. A substrate plate device as claimed in claim 1, wherein said plastic is polyacetal.