JPH04324212A - Key board unit - Google Patents

Abstract

PURPOSE:To reduce an invisible range on a display with thickness, from a substrate upper surface to a panel upper surface, lessened and without obstructing an operating feeling by providing escape holes on a printed board opposite to the falling preventive locking part for a button. CONSTITUTION:When a button 3 is depressed, a contact part 2a is stroked S to contact with a contact 1a on a printed board 1 to be conducted, and also a locking part 3a for the button 3 is lowered in the escape holes 2c and 1b of a conductive contact rubber 2 and the board 1, eliminating interference with the rubber 2 or the board 1. A thickness dimension A, from the board 1 upper surface to a panel 4 upper surface, is decided by the rubber 2 thickness B and the panel 4 thickness D, and the dimension A can be lessened by reducing the thickness B and D even the stroke S is increased. Consequently an invisible range, seen from the opening part formed on the board 1, on a display on the lower part of an opening part can be reduced.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a keyboard unit for a dealing board used in a terminal of a financial institution.

0002

2. Description of the Related Art Conventionally, dealing boards used in terminals of financial institutions carry out financial transactions using telephone lines, and thus have a telephone function and a keyboard for using the telephone function.

[0003] The above keyboard is unitized,
This keyboard unit is provided with operation buttons as shown in FIGS. 11 to 15.

That is, the operation button shown in FIG. 11 consists of a button a, a conductive contact rubber b provided below it, a printed circuit board c, and a panel d provided to cover the printed circuit board c. The button a is urged upward by the elasticity of the button a, and a locking portion e is protruded from the lower outer periphery of the button a, and when the locking portion e engages with the lower surface of the panel d, the button a It is designed so that it does not come off through the hole f of panel d.

In the operation button configured as described above, when button a is pressed, the stroke S descends, and the contact g provided on the conductive contact rubber b comes into contact with the contact h on the printed circuit board c, and the contact h A gap X2 is set between them so that even in this state, the lower end of the button a does not come into contact with the upper surface of the conductive contact rubber b.

[0006] Also, the thickness D of the panel d and the height C of the locking part e
, the thickness of the conductive contact rubber b is B, then the button a is attached to these
The sum of the stroke S and the gap X2 is the thickness dimension A from the top surface of the printed circuit board c to the top surface of the panel d.

On the other hand, FIGS. 13 and 14 show a side cross section of the operation button and a side cross section of the button a in a pressed state. On the side of each operation button, an opening i is provided in the printed circuit board c. A display j provided on the lower side of the printed circuit board c can be seen through this opening i.

However, in the above conventional keyboard unit, the thickness dimension A from the top surface of the printed circuit board c to the top surface of the panel d is large, so when the display j is viewed from an oblique direction, the line of sight Y is as shown in FIG. As a result, an invisible range Z is created on the display j.

In order to prevent such problems, operation buttons are also used as shown in FIGS. 15 and 16.

The operation button shown in FIG. 15 has a dome-shaped button l formed on a polyester sheet k whose surface is printed, and the operation button shown in FIG. 16 has a silicone rubber sheet m provided above it. Another button n is formed on this silicone rubber sheet m, as shown in FIG.
This has the effect that the thickness dimension A from the top surface of the printed circuit board c to the top surface of the panel d can be significantly reduced compared to the operation button shown in FIG.

[0011]

However, in the conventional operation buttons shown in FIGS. 15 and 16, the stroke S of buttons l and n can only be about 1◆ due to the molding technology and lifespan of the polyester sheet.

[0012] As a result, there were disadvantages such as a poor operational feel when pressing the buttons l and n, and a lack of reliability such as early wear when used on a frequently used dealing board.

The present invention has been made in order to improve the above-mentioned conventional drawbacks, and provides a keyboard unit having a small thickness from the top surface of the printed circuit board to the top surface of the panel, and having operation buttons with a good operating feel. The purpose is to

[0014]

[Means for Solving the Problems] In order to achieve the above object, the present invention provides conductive contact rubber and a panel on a printed circuit board, and connects the contacts of the printed circuit board and conductive contacts to a plurality of holes opened in the panel. In a keyboard unit in which a button that makes contact with a rubber contact part is fitted in a vertically movable manner, when the button is pressed, the locking part is inserted into the part opposite to the locking part provided on the button to prevent it from slipping out. It has an escape hole.

[0015]

[Operation] This allows the thickness dimension from the top surface of the printed circuit board to the top surface of the panel to be reduced by simply reducing the thickness of the conductive contact rubber and panel without changing the stroke of the button. The invisible range can be reduced.

[0016]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described in detail with reference to the drawings shown in FIGS. 1 to 8. Figure 1 is a plan view of the keyboard unit used in the operating section of the dealing board, Figure 2
is a front view of the same, FIG. 3 is a side view of the same, FIG. 4 is an enlarged plan view of the vicinity of the operation button, FIG. 5 is a sectional view taken along line E-E of FIG. 4, and FIG.
7 is a sectional view taken along line FF in FIG. 4, and FIG. 8 is a sectional view showing the same operating state.

In these figures, 1 is a printed circuit board, 2 is
3 indicates a conductive contact rubber, 3 indicates a button, and 4 indicates a panel.

The panel 4 has a large number of rectangular holes 4a opened vertically and horizontally, and buttons 3 are inserted into these holes 4a.
are fitted.

[0019] Each of the buttons 3 is formed into a thin shape,
A locking part 3a that engages with the lower surface of the panel 4 from below is provided at a corner of the lower end, and a locking part 3a that engages with the lower surface of the panel 4 from below is provided.
A protrusion 3b that abuts the upper surface of the contact portion 2a of the conductive contact rubber 2 is provided in a protruding manner.

The conductive contact rubber 2 is provided so as to be in close contact with the printed circuit board 1, and below the button 3, two contact portions 2a that bulge upward are provided for each button 3. The thin wall portion 2b of the contact portion 2a
Each button 3 is urged upward by the elasticity of the contact portion 2a, and the contact portion 2a is on the printed circuit board 1 below each contact portion 2a.
A contact point 1a which is electrically connected is formed.

Furthermore, an escape hole 2 is provided in the conductive contact rubber 2 at the portion where the locking portion 3a protruding from the corner of the button 3 comes into contact.
A relief hole 1b is formed in the printed circuit board 1, and a locking portion 3a of the button 3 is loosely inserted into the relief holes 2c and 1b from above.

Even if the button 3 is pressed and the contact portion 2a moves downward by the stroke S, the conductive contact rubber 2
The thickness is set.

Next, the operation will be explained. When the button 3 is not pressed, the elasticity of the thin part 2b of the conductive contact rubber 2 causes the button 3 to rise to the position shown in FIG. It is locked so that it does not come out from the hole 4a.

Next, when the button 3 is pressed, the contact portion 2a makes a stroke S and comes into contact with the contact point 1a on the printed circuit board 1, causing conduction between these contact points 1a, and at this time, the button 3
The locking portion 3a descends inside the escape holes 2c and 1b of the conductive contact rubber 2 and the printed circuit board 1, and does not interfere with the conductive contact rubber 2 or the printed circuit board 1.

Furthermore, the thickness dimension A' from the top surface of the printed circuit board 1 to the top surface of the panel 4 is determined by the thickness B of the conductive contact rubber 2 and the thickness D of the panel 4, and is not related to the stroke S. Even if the conductive contact rubber 2
By reducing the thicknesses B and D of the panel 4, the thickness dimension A' can be reduced, so that even if the display 5 is viewed diagonally from the opening 1c formed in the printed circuit board 1 as shown in FIG. The invisible range on the display 5 with respect to the line of sight Y is Z', which can be significantly reduced compared to conventional keyboard units.

9 and 10 show the locking portion 3 of the button 3.
Another embodiment is provided in which the button 3 is prevented from slipping out from the hole 4a of the panel 4 by protruding downward from the bottom surface of the printed circuit board 1 and locking the locking part 3a on the bottom surface of the printed circuit board 1. If there is space below the printed circuit board 1, the stroke S of the button B can be set arbitrarily by adopting this structure.

[0027]

Effects of the Invention As described in detail above, the present invention has an escape hole in the part opposite to the locking part provided as a stopper to prevent the button from coming out of the hole in the panel, so that the button can be pressed. In this case, the locking part is inserted into the escape hole so that it does not interfere with the conductive contact rubber or printed circuit board, and by simply reducing the thickness of the conductive contact rubber and panel, it can be inserted into the escape hole and the printed circuit board can be easily removed without reducing the button stroke. The thickness dimension from the top surface to the top surface of the panel can be made smaller.

[0028] As a result, when the display is viewed from an oblique direction, the invisible range on the display can be significantly reduced compared to conventional keyboard units, making the display much easier to see.

[0029] Furthermore, since the stroke when pressing the button is the same as that using conventional conductive contact rubber,
The operating feel is not impaired in the slightest, and the durability is much improved compared to those using polyester sheets, making it highly reliable.

[Brief explanation of drawings]

FIG. 1 is a plan view of a keyboard unit according to an embodiment of the present invention.

FIG. 2 is a front view of the same.

FIG. 3 is a side view of the same.

FIG. 4 is an enlarged sectional view of the vicinity of the operation button.

FIG. 5 is a cross-sectional view taken along line E-E in FIG. 4.

FIG. 6 is a sectional view showing the same operating state.

7 is a sectional view taken along line FF in FIG. 4. FIG.

FIG. 8 is a sectional view showing the same operating state.

FIG. 9 is a sectional view showing another embodiment.

FIG. 10 is a sectional view of the same operating state.

FIG. 11 is a sectional view of an operation button provided on a conventional keyboard unit.

FIG. 12 is a sectional view of the same operating state.

13 is a sectional view taken along line GG in FIG. 11. FIG.

FIG. 14 is a sectional view of the same operating state.

FIG. 15 is a sectional view of another operation button provided on a conventional keyboard unit.

FIG. 16 is a sectional view of another operation button provided on a conventional keyboard unit.

[Explanation of symbols]

1 Printed circuit board 1a Contact 1b Escape hole 2 Conductive contact rubber 2a Contact part 2c Escape hole 3 button 3a Locking part 4 Panel 4a hole S Stroke A´　　Thickness dimension

Claims (1)

[Claims] Claim 1: A conductive contact rubber and a panel are provided on a printed circuit board, and a plurality of holes opened in the panel are provided with a conductive contact rubber and a panel.
In a keyboard unit in which a button that brings the contacts of the printed circuit board into contact with the contacts of the conductive contact rubber is fitted in a vertically movable manner, when the button is pressed, A keyboard unit characterized by forming an escape hole into which a locking part is inserted.