JP2591978Y2 - Optical touch switch - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optical touch switch in which a light emitting element is arranged on two adjacent sides of a square and a plurality of light receiving elements are arranged on the other two sides.

[0002]

2. Description of the Related Art Conventionally, there are optical touch switches described in Japanese Utility Model Application Laid-Open No. 31439/1988 and Japanese Utility Model Application Laid-Open No. 103536/1988, and have a schematic configuration as shown in FIGS. ing.

That is, a plurality of light emitting elements 3 are arranged on each side of the coordinate input surface 2 of the panel 1 in the vertical and horizontal directions, and a plurality of light receiving elements 4 are arranged on the remaining vertical and horizontal sides. By touching 2, the light path from each light emitting element 3 to the light receiving element 4 at the opposing position is blocked, and the position of the set of the blocked light emitting and light receiving elements 3 and 4 is introduced to the position where the finger 5 touches. Are calculated on the coordinate input surface 2.

In this type of optical touch switch, each of the above elements 3 and 4 is accommodated in an accommodating recess formed on an upper surface of a rectangular frame-shaped element case normally arranged on a printed circuit board. After each element is accommodated, a cover for protecting each element and blocking disturbance light is attached to this case.

Conventionally, the above-described case is fixed to the printed circuit board by screwing or welding, and a cover is locked to the case by a locking mechanism, or a part of the cover is clinched on the back surface of the printed circuit board to prevent the cover from being closed. Installation has been performed. Note that the case
The piece is formed integrally in advance, and this engagement piece is printed
Although a method of engaging with the substrate is also conceivable, this method
Connect the terminals of the optical element and light receiving element to through holes on the printed circuit board.
At the same time, insert the engaging piece of the case into the printed circuit board.
Terminal and engagement part always maintain the same positional relationship when mating
The insertion work is performed while
Pressing the case with strong pressing force to engage the plate
This stress causes the terminal to bend,
There is a risk that it may not be inserted properly,
This is not a preferred structure.

[0006]

[Problems to be Solved by the Invention] However, in the case of the above-described conventional screw fixing such as fixing and mounting the case and the cover, the number of components is increased, and in the case of welding or clinching, the electronic components are already used. It is necessary to perform welding and clinch work on the printed circuit board in a mounted state, and there is a possibility that the printed circuit board, electronic components and the like may be damaged, and the workability is poor.

Further, since the case and the cover must be fixed and attached to each other, the number of assembling steps is large.

The present invention has been made to solve the above-mentioned problems, and can reduce the number of parts and the number of assembling steps, and can perform a safe operation without fear of damaging printed circuit boards and electronic parts. The purpose is to be.

[0009]

An optical touch switch according to the present invention has a rectangular frame-shaped element case disposed on a printed circuit board, and light-emitting elements are respectively accommodated on upper surfaces of two adjacent sides of the case. A plurality of light-receiving element accommodating recesses are formed, and a plurality of light-receiving element accommodating recesses for accommodating light-receiving elements are respectively formed on the upper surface of the remaining two sides of the case at positions facing the respective light-emitting element accommodating recesses. A light-emitting element is housed in each of the light-emitting element housing recesses, a light-receiving element is housed in each of the light-receiving element housing recesses, and the elements housed in the housing recesses are covered by covers from above. In the optical touch switch, a plurality of through holes are provided in the printed circuit board in the vicinity of the position of the case, and the plurality of through holes are formed at a lower end of the cover. Is characterized and inserted through a plurality of small pieces, further comprising an engaging portion for fixing said each piece of tip formed on the engaging said cover to the lower surface side of the printed circuit board to the printed circuit board.

[0010]

In the present invention, small pieces at the lower end of the cover are inserted into the respective through-holes provided in the vicinity of the arrangement position of the element case on the printed circuit board, and the engaging portions at the tips of the small pieces are placed on the lower surface side of the printed circuit board. Engagement and the cover are fixed to the printed circuit board, so there is no need to fix the element case to the printed circuit board as in the past, just insert each small piece of the cover into the through hole of the printed circuit board. The cover and the element case can be fixed with one touch.

[0011]

1 is a sectional view of an embodiment of the present invention, FIG. 2 is a partial perspective view, and FIG. 3 is an exploded perspective view.

As shown in FIG. 3, a rectangular frame-shaped metal element case 12 is disposed on a printed circuit board 11, and two adjacent sides 12a and 12b of the element case 12 are provided on the upper surface as shown in FIGS. The light emitting element accommodating recess 13 is formed, and the remaining two sides 12c and 12d of the element case 12 are formed.
A light receiving element accommodating recess is formed at a position facing each light emitting element accommodating recess 13 on the upper surface of the light emitting element, and a light emitting element 14 such as an LED is accommodated in each light emitting element accommodating recess 13 as shown in FIGS. A light receiving element such as a phototransistor is housed in each light receiving element housing recess.

At this time, as shown in FIG.
4 terminal pin 15 is inserted into the pin insertion hole 11 of the printed circuit board 11.
a and is soldered to the copper foil pattern of the printed board 11 on the lower surface side of the printed board 11.

Further, as shown in FIG.
A plurality of through holes 17 are provided in the vicinity of the outside of the first element case 12 and a cover 18 having an L-shaped cross section is placed from the upper surface to the outer peripheral surface of the element case 12 as shown in FIG. A plurality of small pieces 19 formed integrally with the lower end of the cover 18 and extending downward are inserted through the respective through holes 17,
An engaging portion 20 formed by bending the tip of each small piece 19 into a U-shape is engaged with the lower surface side of the printed circuit board 11 to cover the cover 1.
8 is fixed to the printed circuit board 11, and the element case 12 is also fixed.

Therefore, the element case 12 is connected to the printed circuit board 1.
It is not necessary to fix the cover 1 at all, only the small pieces 19 of the cover 18 are inserted into the respective through holes 17 of the printed circuit board 11 and the engaging portions 20 are engaged with the lower surface side of the printed circuit board 11.
The element case 12 can be fixed at the same time as the cover 18 by one-touch, so that screws for fixing the case as in the conventional case are not required, the number of parts and the number of assembly steps can be reduced, and the conventional welding and clinching can be performed. Such a work is not required, and a safe work can be performed without fear of damaging a printed circuit board, an electronic component, or the like.

The shape of the cover and the shape of the engaging portion are not limited to those of the above embodiment.

[0017]

As described above, according to the optical touch switch of the present invention, the small piece at the lower end of the cover is inserted into the through hole of the printed circuit board, and the engaging portion at the tip of each small piece is placed on the lower surface side of the printed circuit board. Since the cover is fixed by engagement, the element case can be fixed at the same time as the cover with one touch, so that the number of parts and the number of assembly steps can be reduced, and the printed circuit board and electronic parts may be damaged. And safe work is possible. The cover and case are
Since they are configured separately, the engaging part is transparent.
Even when a relatively strong stress is applied when inserting into the hole,
Only the cover with the engaging part can absorb stress independently
When the terminals of each element are bent on the case side,
It can prevent situations such as not being able to be inserted,
Kana mounting operation can be performed.

[Brief description of the drawings]

FIG. 1 is a sectional view of an embodiment of the present invention.

FIG. 2 is a partial perspective view of one embodiment.

FIG. 3 is an exploded perspective view of one embodiment.

FIG. 4 is a plan view of a conventional example.

FIG. 5 is a sectional view of FIG. 4;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 11 Printed circuit board 12 Element case 13 Light emitting element accommodating recess 14 Light emitting element 17 Through hole 18 Cover 19 Small piece 20 Engagement part

──────────────────────────────────────────────────続 き Continuation of front page (56) References JP-A-5-94748 (JP, A) JP-A-5-17888 (JP, U) JP-A-4-133336 (JP, U) JP-A-5-134336 79237 (JP, U) Japanese Utility Model Application No. 3-97967 (JP, U) Japanese Utility Model Application No. 3-40077 (Japanese Utility Model Application No. 4-133336) JP, U) Japanese Patent Application No. 62-173821 (Japanese Utility Model Application No. Hei 1-79237) Microfilm photographing the contents of the specification and drawings attached to the application (JP, U) Japanese Utility Model Application No. 2-6849 (Japanese application) Microfilm (JP, U) (58) Field of investigation (Int.Cl. ⁶ , DB name) H01H 35/00

Claims (1)

(57) [Scope of request for utility model registration] 1. A rectangular frame-shaped element case is arranged on a printed circuit board, and a plurality of light-emitting element accommodating recesses respectively accommodating light-emitting elements are formed on upper surfaces of two adjacent sides of the case, and the case is formed. Forming a plurality of light receiving element housing recesses respectively housing light receiving elements at positions on the upper surface of the remaining two sides facing each of the light emitting element housing recesses,
A light emitting element is accommodated in each of the light emitting element accommodating recesses, a light receiving element is accommodated in each of the light receiving element accommodating recesses, and each element accommodated in each of the accommodating recesses is covered by a cover from above. In the optical touch switch, a plurality of through-holes provided in the vicinity of the arrangement position of the case on the printed board, and a plurality of small pieces formed at the lower end of the cover and inserted into the respective through-holes, An optical touch switch, comprising: an engaging portion formed at a tip of each of the small pieces and engaging with a lower surface side of the printed circuit board to fix the cover to the printed circuit board.