JPH0418041Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention relates to a photoelectric device having a dustproof protective cover attached to an electronic component for emitting or receiving light.

(Prior Art) In a panel consisting of a rectangular frame, a plurality of light emitting elements are arranged side by side in the frame forming two adjacent sides, and a light receiving element is placed opposite to the light emitting elements on the frame forming the remaining two sides. A photoelectric contact input panel has been developed that consists of multiple devices arranged side by side. According to this photoelectric contact input panel, it is possible to create a plurality of light beams from the light emitting element to the opposing light receiving element by arranging them both vertically and horizontally within the panel surface, and when a finger or the like is placed on the panel. At this time, the approximate position of the object on the panel can be detected from the vertical and horizontal light beams blocked by the finger or the like. Such a photoelectric contact input panel is often used by being built into the front of a display device such as a plumber tube.For example, as shown in FIG. There is one with a touch input panel 2 attached. This input panel 2 consists of a rectangular frame-shaped cover 3 and electronic components 4 and 5 arranged inside the cover 3. The electronic components 4 and 5 include light emitting elements 4
and a light receiving element 5. A plurality of light-emitting elements 4 and light-receiving elements 5 are arranged in parallel along each opposing side of the rectangular cover 3, and the light-emitting element 4 and the light-receiving element 5 are arranged in parallel on the front surface of the plumber tube 1.
A plurality of light beams 6 are formed. For this reason, the cover 3 is made of a material that transmits the light beam 6 at least on the optical path of the light beam 6. This light beam 6 is formed in a matrix shape that is perpendicular to the vertical and horizontal directions on the front surface of the plumber tube 1. Therefore, for example, when a finger 7 is brought into contact with the screen, the light beam 6 is blocked by the finger 7 in the vertical and horizontal directions. The position of the finger can be detected from the position of the light beam 6.

Therefore, by attaching the photoelectric contact input panel 2 to the display tube of a computer and touching the operator's finger to various information displayed on the cathode ray tube, the operator can detect the desired information without using the keyboard. It is possible to obtain a photoelectric touch input system that can perform input to the computer.

(Problems to be Solved by the Invention) When using the touch input system as described above, the sensitivity of the light emitting and light receiving elements 4 and 5 is important for accurate position detection. Therefore, if dust adheres to the surfaces of the light-emitting and light-receiving elements 4 and 5 or the surface of the cover 3 on the optical path of the light beam 6, the amount of light reaching the light-receiving element 5 will be reduced by this dust, making accurate position detection impossible. The problem is that it becomes difficult. In this case, the dust on the outer surface of the cover 3 can be easily wiped off, but the dust attached to the inner surface of the cover 3 and the surfaces of the light emitting and light receiving elements 4 and 5 cannot be wiped off unless the cover 3 is removed. First, a decrease in position detection accuracy due to dust adhesion is likely to become a problem.

(Means for Solving the Problems) The present invention attempts to prevent the above-mentioned problem of dust adhesion.

A photoelectric device according to the present invention includes a plurality of light-emitting and light-receiving elements disposed within a light-transmitting frame-shaped cover formed along the periphery of a display screen of a display device, and the light-emitting and light-receiving elements are arranged individually or in plurality. The device is divided into groups and covered with a dust-proof protective cover, the front surface of the dust-proof protective cover is brought into close contact with the inner surface of the frame-shaped cover, and the optical path between the light emitting and light receiving elements is made into a dust-proof structure. It is.

(Function) When electronic components such as light-emitting and light-receiving elements are sealed and covered by the dust-proof protective cover as described above, dust does not adhere to the surface of the electronic components, and the front surface of the dust-proof protective cover is sealed. By being in close contact with the inner surface of the frame-shaped cover, dust does not adhere to the outer surface of the dust-proof protective cover and the inner surface of the frame-shaped cover on the optical path. Therefore, in the optical path from the light-emitting element to the light-receiving element, dust may adhere only to the outer surface of the frame-shaped cover.

(Embodiments) Hereinafter, preferred embodiments of the present invention will be described using the drawings.

FIG. 1 is a perspective view showing a display device 50 equipped with a photoelectric touch input panel 10 equipped with a photoelectric charging device according to the present invention. installed.

FIG. 2 is a cross-sectional view of the touch input panel 10 attached to the front surface of the cathode ray tube 51 along the arrow -. As can be seen from this figure, the touch input panel 10 includes a cathode ray tube 5
1, a plurality of electronic components 13 and 14 arranged in line along the sides of the rectangle inside the cover 11, and a base 12 that supports the electronic components 13 and 14. and a dustproof cap 15 constituting a dustproof protective cover that individually seals and covers the electronic components 13 and 14. The electronic component 13 is a light emitting element, and the electronic component 14 is a light receiving element, which are arranged on opposite sides. for example,
In this example, the light emitting elements 13 are arranged side by side on the upper side and left side of the cover 11, and the light emitting elements 13 are arranged side by side on the lower side and right side. The light emitting element 13 on the upper side and the light receiving element 14 on the lower side, and the light emitting element 13 on the left side and the light receiving element 14 on the right side, respectively, form pairs and face each other. As a result, a plurality of light beams extending vertically (vertically) and a plurality of light beams extending horizontally (horizontally) are formed in a matrix. Note that the cover 11 is made of a material that transmits the light beam at least on the optical path of the light beam, so that it does not block the light beam. Therefore, when you touch the front surface of the cathode ray tube 1 with your finger, the light beam that passes through the area where your finger is placed is blocked by your finger, and the output of the light receiving element 14 that receives this light beam is extremely reduced. do. As a result, it is possible to detect which light beam has been interrupted, so that the position of the finger can be detected by detecting the locations where the vertical and horizontal light beams are interrupted.

In this example, each light emitting and light receiving element 13,
14 are each hermetically covered by a dustproof cap 15, and this structure is shown in an enlarged scale in FIG. This dustproof cap 15 is connected to the base 1
A flange portion 15a fixed to the cylindrical portion 2 with double-sided tape, adhesive, etc., a cylindrical portion 15c having a bellows portion 15b, and an inwardly recessed disk-shaped dustproof lip portion 15d covering the tip of the cylindrical portion 15c are integrally molded. It is made of a material that transmits light from the light emitting element 13. Therefore, when the light emitting element 13 is inserted into the cylindrical part 15c and the flange part 15a is fixed to the base 12 as shown in the figure, the light emitting element 1
3 is hermetically covered by the dust-proof cap 15, and the intrusion of dust into the dust-proof cap 15 can be prevented, so that the problem of dust adhering to the outer surface of the light emitting element 13 is eliminated.

Furthermore, this dustproof cap 15 is connected to the light emitting element 13.
When this is disposed inside the cover 11 after being covered and fixed to the base 12, the bellows part 15
The lip portion 15d is brought into close contact with the inner surface 11a of the cover 11 due to the vertical elasticity of the portion b. In this case, since the lip portion 15d is formed in the shape of a disc concave inward, the peripheral part of the disc comes into close contact with the inner surface 11a of the cover 11, preventing dust from entering inside from this peripheral part. do. However, it is only necessary that the entire disc be brought into close contact with each other, and the lip portion 15d may be smooth. Here, the portion of the inner surface 11a of the cover 11 that is in close contact with the lip portion 15d is connected to the light emitting element 13 and the light receiving element 14 opposite thereto.
This prevents dust from adhering to the inner surface 11a of the cover 11 in the optical path. Note that since the bellows portion 15b provides vertical elasticity, for example, as shown in the figure, the cover 1
Even in the case where the inner surface 11a of 1 is slightly inclined with respect to the lip portion 15d, the lip portion 15d can be brought into close contact with the inner surface 11a.

FIG. 4 shows a different example of the dustproof cap, and this dustproof cap 16 is different from the dustproof cap 15 in FIG.
The flange portion 15a is not included, and the base of the cylindrical portion 16c is bonded to the base of the light emitting element 13. Bellows part 16b and lip part 16
d is the same as the dustproof cap 15 in Fig. 3, but
In the case of this cap 16, since the adhesive area of the flange portion 15a to the base plate 12 is not required, the interval between the issuing elements 13 can be narrowed compared to the case of FIG. 3. In addition, in Figures 3 and 4,
Although the case of the light emitting element 13 has been described, the dustproof cap of the light emitting element 14 is also the same, so the explanation thereof will be omitted.

In the above, an example has been described in which the light emitting element 13 and the light receiving element 14 are individually sealed and covered with a dustproof cap, but it is also possible to seal and cover a plurality of light emitting elements or light receiving elements with one dustproof cap. Of course. For example, the first
As shown in FIG. 5, which is a sectional view taken along the arrow - in the figure, the dustproof cap has a flat elliptical cylindrical portion 17c so that the five light emitting elements 13 are hermetically covered by one dustproof cap. 17 may also be used. This dustproof cap 17 has a bellows part 17b on a cylindrical part 17c, a flange part 17a fixed to the base 12 at the base part, and a cover 1 at the tip part.
It has a lip portion 17d that is brought into close contact with the inner surface 11a of 1.

(Effects of the invention) As explained above, according to the invention, electronic components (light emitting elements, light receiving elements, etc.) are hermetically covered with a dustproof protective cover, and the dustproof protective cover protects the optical path of the electronic components. Since it is designed to be tightly attached to the inner surface of the frame-shaped cover containing the electronic components, it is possible to prevent dust from adhering to the surface of the electronic components and the inner surface of the cover, and to reduce the amount of light caused by dust in the optical path from the electronic components. The decline can be prevented.

[Brief explanation of drawings]

FIG. 1 is a perspective view showing a display device equipped with a photoelectric contact panel equipped with a photoelectric device according to the present invention, FIG. 2 is a cross-sectional view taken along the arrow - in FIG. 1, and FIG. FIG. 4 is a cross-sectional view showing a different example of the dust-proof protective cover, and FIG. 5 is a cross-sectional view showing a different example of the dust-proof protective cover along the arrow - in FIG. 1. FIG. 6 is a sectional view showing a conventional photoelectric contact input device. 1, 51... Braun tube, 2, 10... Photoelectric contact input panel, 3, 11... Cover, 4, 13...
...Light emitting element, 5, 14... Light receiving element, 15, 1
6, 17...Dust-proof cap, 15a, 17a...
Flange portion, 15b, 16b, 17b... bellows portion, 15d, 16d, 17d... lip portion.

Claims (1)

[Claims for Utility Model Registration] A photoelectric device including a plurality of light-emitting and light-receiving elements disposed within a light-transmitting frame-like cover formed along the periphery of a display screen of a display device, comprising: individually or in groups and covered with a dustproof protective cover, the front surface of the dustproof protective cover is brought into close contact with the inner surface of the frame-shaped cover, and the optical path between the light emitting and light receiving elements is made dustproof. Features photoelectric device.