GB1591895A

GB1591895A - Electronic devices

Info

Publication number: GB1591895A
Application number: GB51546/77A
Authority: GB
Original assignee: Individual
Current assignee: Individual
Priority date: 1977-12-12
Filing date: 1977-12-12
Publication date: 1981-07-01

Description

(54) IMPROVEMENTS IN OR RELATING TO ELECTRONIC DEVICES (71) I, GENNADY GRIGORIEVICH SMOLKO of kvartira 19, korpus 501 Moscow 103482, Union of Soviet Socialist Republics, a citizen of the Union of Soviet Socialist Republics, do hereby declare the invention, for which I pray that a patent may be granted to me, and the method by which it is to be performed, to be particularly described in and by the following statement: This invention relates to electronic devices.

Such devices may be used to advantage in electronic calculators, electronic watches, radio and TV sets, and measuring instruments.

According to the invention, there is provided an electronic device comprising a case made of a metal of the valve group, the surface layer of the inner side of the case having a texturised anodised oxide film formed on the surface layer of the metal of the case, said surface layer carrying a thin or thick film integrated microcircuit and/or one or more discrete electronic components.

A preferred electronic device has an inner surface having a dielectric layer carrying a thin or thick film integrated microcircuit, the case of the device being made of a metal of the valve group, and the dielectric layer being a texturised anodised oxide film obtained from the metal of the case and formed on the surface layer of the said metal.

Such an embodiment of the electronic device provides for a homogeneity of the material of the case, substrate and elements of the thin or thick film integrated microcircuit, reliable removal of the heat given up by the microcircuit elements and a high mechanical and thermal resistance of the entire device, thereby ensuring a high service reliability of the electronic device.

The invention will be further described, by way of example, with reference to the accompanying drawings, in which: Fig. 1 is an enlarged cross-sectional view of a preferred electronic device; and Fig. 2 is a top plan view of the electronic device of Figure 1 with an uncovered section.

An electronic calculator will be further described as an example of a specific embodiment of the present invention.

The preferred electronic device comprises a case 1 (Fig. 1). The case 1 is made of a metal of the valve group, say, of aluminium.

Titanium, tantalum, niobium, etc. may be used besides aluminium.

The inner surface of the case 1 has a dielectric layer 2. The latter is a texturized anodized oxide film further referred to as the film 2. The film 2 is obtained from the metal of the case 1, i.e., from the aluminium, and is formed on the surface layer of the mentioned metal (the boundary between the film 2 and the metal proper is shown in the drawing arbitrarily by a dashed line).

A thin or thick film integrated microcircuit 3 is made on the texturized anodised oxide film 2. The microcircuit 3 may have various combinations of circuit elements.

Fig. I shows one of the versions of the microcircuit 3 containing a contact area 4 connected by a current-carrying path 5 to a capacitor 6 with foils 7 and 8 separated by a dielectric interlayer 9. The capacitor 6 is connected electrically by a current-carrying path 10 to a resistor 11 that is connected, in turn, by a current-carrying path 12 to a contact area 13. Contact areas 13, 14 and 15 hold a microcircuit 16. The contact areas may serve for attaching any other necessary circuit element, such as a transistor.

The case 1 is provided with a cover 17 made of the same metal as the case 1, i.e. of aluminium, kept within slots 18 of the case 1. The cover may also be made of any other material.

The cover 17 (Fig. 2) carries push-buttons 19 of a calculator keyboard for data input, an indicator 20 and a switch 21.

Contacts 22 of the keyboard buttons 19 are arranged on the texturized anodised oxide film 2.

The preferred electronic tlcvice 'prates as follows.

On connecting a source of clcctric posscr supply (not shown in the drawing) t(-, the elements of the thin or thick film integrated microcircuit 3 (Fig. 1), the dissipated power heats the tcxturizcd anodiscd oxide film 2 carrying the elements of the microcircuit 3.

Since the texturized anodised oxide film 2 is formed on the metal of the case 1 , there are no constructional elements of high thermal resistance between the oxide film 2 and the case 1. Consequently, the heat given up by the elements of the film integrated microcircuit 3 is dissipated by the entire metal mass of the case I As the coefficients of thermal expansion of the metal case l-texturized anodised oxide film 2-film integrated microcircuit 3 system are of similar values, cven sharp changcs in temperature occuring on. say, switching the device on and off do not give rise to considerable mcchanical strcsses within the electronic device.

Besides, the mcchanical strcsscs produced on operating the calculator keyboard do not destroy the metal case l-texturized anodised oxide film 2-film integrated microcircuit 3 system since the film 2 is formed in the metal of the case 1 The rcsulting cffcct attained by the use of the preferred electronic device provides for a considerable improvement of the service reliability of the device.

The abovc-dcscribed vcrsion of the electonic device compriscs an electronic calculator. The invention may also be used, for example, in electronic watches radio and TV sets and mcnsuring instruments.

In cases X hen the cover is made of the same valve-gronp metal as that of the case, for instance in mcsuring instruments, the texturized anodised oxide film may be formed in the surface layer of the cover metal. on the inner side of the surface of the electronic device case, and the elements of the thin or thick film integrated microcircuit may be arranged on the formed film.

In certain cases, such as, in TV sets, the case of the electronic device may have partitions. The latter are made of the same metal as the case of the device, the surface layer of which may be given a texturized anodised oxide film also carrying the elements of the thin or thick film integrated microcircuit.

The preferred electronic device is of high service reliability and is easy to manufacture, thus providing favourable conditions for all-round automation of the manufacturing process of the electronic device.

WHAT I CLAIM IS: 1. An electronic device comprising a case made of a metal of the valve group, the surface layer of the inner side of the case having a texturized anodised oxide film formed on the surface layer of the metal of the case, said surface layer carrying a thin or thick film integrated microcircuit and/or one or more discrete electronic components.

2. An electronic device substantially as hereinbefore described with reference to the accompanying drawings.

**WARNING** end of DESC field may overlap start of CLMS **.

Claims

**WARNING** start of CLMS field may overlap end of DESC **. oxide film 2. The preferred electronic tlcvice 'prates as follows. On connecting a source of clcctric posscr supply (not shown in the drawing) t(-, the elements of the thin or thick film integrated microcircuit 3 (Fig. 1), the dissipated power heats the tcxturizcd anodiscd oxide film 2 carrying the elements of the microcircuit 3. Since the texturized anodised oxide film 2 is formed on the metal of the case 1 , there are no constructional elements of high thermal resistance between the oxide film 2 and the case 1. Consequently, the heat given up by the elements of the film integrated microcircuit 3 is dissipated by the entire metal mass of the case I As the coefficients of thermal expansion of the metal case l-texturized anodised oxide film 2-film integrated microcircuit 3 system are of similar values, cven sharp changcs in temperature occuring on. say, switching the device on and off do not give rise to considerable mcchanical strcsses within the electronic device. Besides, the mcchanical strcsscs produced on operating the calculator keyboard do not destroy the metal case l-texturized anodised oxide film 2-film integrated microcircuit 3 system since the film 2 is formed in the metal of the case 1 The rcsulting cffcct attained by the use of the preferred electronic device provides for a considerable improvement of the service reliability of the device. The abovc-dcscribed vcrsion of the electonic device compriscs an electronic calculator. The invention may also be used, for example, in electronic watches radio and TV sets and mcnsuring instruments. In cases X hen the cover is made of the same valve-gronp metal as that of the case, for instance in mcsuring instruments, the texturized anodised oxide film may be formed in the surface layer of the cover metal. on the inner side of the surface of the electronic device case, and the elements of the thin or thick film integrated microcircuit may be arranged on the formed film. In certain cases, such as, in TV sets, the case of the electronic device may have partitions. The latter are made of the same metal as the case of the device, the surface layer of which may be given a texturized anodised oxide film also carrying the elements of the thin or thick film integrated microcircuit. The preferred electronic device is of high service reliability and is easy to manufacture, thus providing favourable conditions for all-round automation of the manufacturing process of the electronic device. WHAT I CLAIM IS:

1. An electronic device comprising a case made of a metal of the valve group, the surface layer of the inner side of the case having a texturized anodised oxide film formed on the surface layer of the metal of the case, said surface layer carrying a thin or thick film integrated microcircuit and/or one or more discrete electronic components.