JPH1013517A - Key contact pattern structure for portable telephone set - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a key contact pattern structure in which the same printed wiring board (PWB) is used even in the case that the design of key position and interval differs so as to improve the productivity of the portable telephone set. SOLUTION: In the case of a portable telephone set using a key sheet 1 having a carbon print section 4, the size of a key contact pattern 3 of a PWB 2 of the portable telphone set is selected to a dedree of being able to cope with key position and key interval estimated to be moved from key sheet carbon print contact positions 5, 6, 7 so as to extend the contact position range of the key sheet carbon print section 4 to the key contact pattern of the PWB of the portable telephone set thereby allowing the contact position range of the key sheet carbon print section 4 to contact and move to the key contact pattern of the PWB of the portable telephone set.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a key contact pattern structure of a portable telephone.

[0002]

2. Description of the Related Art FIG. 3 shows a key contact pattern structure of a conventional portable telephone. FIG. 3 (a) is a plan view of a conventional key contact pattern, and FIG. It is sectional drawing which shows the contact of the key sheet carbon printing part. Conventionally, when a key sheet having a key sheet carbon printing portion is used in a key contact pattern structure of a mobile phone, a key contact of a PWB (printed wiring board) 2 is used as shown in FIG. The key sheet carbon printing portion 4 having a size corresponding to the pattern 3 was in contact with the key contact pattern 3 of the PWB 2. Therefore, the contact position 8 of the key sheet carbon printing unit 4 was circular with respect to the circular key contact pattern 3. This is indicated by the dotted contact pattern in the figure. The key contact pattern 3 was in contact with the key sheet carbon printing section 4 of the key sheet 1 as shown in FIG.

[0003]

The above-mentioned conventional key contact pattern structure is a key sheet contacting a key contact pattern of a portable telephone, and is a PWB key contact pattern structure in the case of using a key sheet having a carbon printing portion. Yes, the key sheet carbon printed portion having a size corresponding to the key contact pattern of the PWB contacts the key contact pattern of the PWB. Therefore, even if the design is changed only by changing the key positions and intervals of the mobile phone, it is necessary to change the PWB by moving the position of the PWB key contact pattern in accordance with the design. At that time, due to the difference in the design of only the key position and the interval of the mobile phone, a plurality of PWBs having different key contact pattern positions and intervals exist. As described above, producing a plurality of mobile phones having different designs of the key position and the interval greatly deteriorates the production efficiency.

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a key contact pattern structure that can use PWB in the same manner even if the design of the key position and the interval is different and can improve the productivity.

[0005]

SUMMARY OF THE INVENTION The above-described problem is caused by the key contact pattern structure of the portable telephone according to the present invention, that is, when a carbon-printed key sheet is used, the size of the PWB key contact pattern is determined by the key sheet. By expanding the key sheet carbon printing unit to the key contact pattern of the PWB of the portable telephone by expanding the key sheet carbon printing unit to the extent that it can correspond to the key position and key interval expected to move from the carbon printing unit contact position, The problem is solved by allowing the contact movement of the sheet carbon printing unit to the PWB key contact pattern of the mobile phone. Preferably, the key contact pattern is formed in a vertically long or horizontally long oval. Furthermore, various shapes such as a rectangle and an ellipse can be formed.

With the key contact pattern structure of the present invention described above, the PWB key contact pattern structure, which is a problem of the conventional PWB key contact pattern structure, can be changed only by changing the design in which the key position and the interval of the key sheet are different. It is not necessary to change the PWB by moving the position of the contact pattern.

[0007]

FIG. 1 shows a key contact pattern of a portable telephone according to the present invention. FIG. 1A is a plan view of the key contact pattern of the present invention, and FIG. 1B is a side view showing the contact between the key contact pattern and the key sheet carbon printing unit.

First, the structure of the key contact pattern of the present invention will be described with reference to FIG. 1B. The key sheet 1 having the key sheet carbon printing section 4 and the movement from the key sheet carbon printing section 4 are expected. PW having a key contact pattern 3 that is large enough to accommodate key positions and key intervals
B2, and the key sheet carbon printing section 4 and the key contact pattern 3 are opposed to each other.

Next, the operation of the key contact pattern of the portable telephone according to the present invention will be described with reference to FIG. Here, the contact positions of the key sheet carbon printing portion of the key contact pattern 3 are indicated by dotted lines in three stages. The cross section of the key contact pattern 3 is an oval, and the key sheet carbon printing section 4 is in contact with the key sheet carbon printing section contact position A-5, which is usually the center position of the key contact pattern 3. If the design of the position and arrangement of the key sheet carbon is different, the key sheet carbon printing contact position B-6 of the key contact pattern 3 in the upper part of the figure or the key sheet carbon printing contact position C-7 of the lower part of the key sheet in the figure is replaced with the key sheet carbon. The printing unit 4 comes into contact. As described above, the key contact pattern structure of the mobile phone according to the present invention is based on the PWB of the mobile phone.
By making the size of the key contact pattern 3 large enough to correspond to the key positions and key intervals expected to move from the key sheet carbon printing section contact positions 5, 6, and 7,
The contact position range of the key sheet carbon printing unit 4 to the PWB key contact pattern 3 of the mobile phone is expanded, and the contact movement of the key sheet carbon printing unit 4 to the PWB key contact pattern 3 of the mobile phone can be tolerated. .

The case where the key contact pattern structure of the portable telephone according to the present invention is actually used with the above structure and operation will be described with reference to FIG. FIGS. 2A and 2B show mobile phones having different key positions and arrangements.
FIG. 2B is a mobile phone having a key position design A, in which the key position is lower at the center than at both ends, and FIG. The figure shows a mobile phone in which both ends are parallel at the same height. FIG. 2C shows a PWB having the key contact pattern structure of the present invention. The black portions indicate the contact points, and it can be seen that the rows at both ends are almost circular and the rows at the center are oval. This is shown in FIG.
When (a) and (b) are used, the position fluctuates near the center, so that the center row is oblong in order to cope with both. Since the conventional key contact pattern structures are almost all circular and cannot be used for these two types of mobile phones, the PWB 2 needs to be changed.

As described above, in the present invention, the key contact pattern is formed in an elliptical shape, but may be formed in various shapes such as a rectangle and an ellipse.

[0012]

As described above, the effect of the key contact pattern structure of the present invention eliminates the need to change the PWB by moving the position of the PWB key when the design of the position and arrangement of the key of the portable telephone is changed. That's what it means.

[Brief description of the drawings]

1A and 1B show a key contact pattern structure of a mobile phone according to the present invention, wherein FIG. 1A is a plan view of the key contact pattern, and FIG. 1B is a cross-sectional view showing contact between the key contact pattern and a key sheet carbon printing unit.

FIG. 2 is a view showing respective mobile phones having different key positions and arrangements using the key contact pattern structure of the mobile phone of the present invention;
(A) is a mobile phone (key position design A) in which the key position is lower at the center compared to both ends, and (b) is a mobile phone (key) in which the center and both ends are parallel at the same height. (C) shows a PWB having a key contact pattern structure of the present invention.

3A and 3B show a key contact pattern structure of a conventional mobile phone, wherein FIG. 3A is a plan view of the key contact pattern, and FIG. 3B is a cross-sectional view showing contact between the key contact pattern and a key sheet carbon printing unit.

[Explanation of symbols]

 1 key sheet 2 PWB 3 key contact pattern 4 key sheet carbon printing section 5 key sheet carbon printing section contact position A 6 key sheet carbon printing section contact position B 7 key sheet carbon printing section contact position C 8 key sheet carbon printing section contact position D 9 PWB having key contact pattern structure 10 Mobile phone with key position design A 11 Mobile phone with key position design B

Claims (4)

[Claims] 1. A key sheet comprising a key sheet having a carbon printing portion and a PWB having a key contact pattern.
In the key contact pattern structure of the mobile phone, the size of the key contact pattern of the PWB of the mobile phone is made large enough to correspond to a key position and a key interval expected to move from the contact position of the key sheet carbon printing unit. By doing so, the contact position range of the PWB of the key sheet carbon printing unit to the key contact pattern of the PWB of the mobile phone is expanded, and A key contact pattern structure characterized by allowing all contact movements. 2. The key contact pattern structure according to claim 1, wherein said key contact pattern is oval. 3. The key contact pattern structure according to claim 1, wherein said key contact pattern is elliptical. 4. The key contact pattern structure according to claim 1, wherein said key contact pattern is rectangular.