JPS5918684A - Photo interrupter - Google Patents

Abstract

PURPOSE:To improve assembling efficiency, by forming a unitary structure by transparent plates on the sides of a light emitting element and a light receiving element, and coupling this structure into a light path. CONSTITUTION:Non-light transmitting cases 3 and 4 and a member 11 which connects said cases, are formed as a unitary body. Opening parts 5 and 6, which make light to pass, are formed in the cases 3 and 4 so as to face each other. Then, a light emitting element 1 and a light receiving element 2 are inserted and fixed to a specified positions. In this case, the element 1 and the element 2 are arranged so as to face each other through the opening parts 5 and 6. A detecting part, which detects a body and the like, is constituted by this light path. A transparent body 10, which is constituted as a unitary body, is coupled with the opening parts 5 and 6 and set. In this constitution, the assembling efficiency can be improved.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to an improvement in a dust-proof photointerrupter.

[Technical background of the invention]

As shown in FIG. 1 (4), a conventional general dust-proof type 7-meter interlagter has a light-emitting element 1 and a light-receiving element 2 arranged facing each other in non-transparent cases 3 and 4, respectively. The light emitted from the light emitting element 1 is transmitted through the opening 5 of the case 3. Further, an optical path is formed so that the light passes through the opening 6 of the case 3 and enters the light receiving element 2. For example, objects are detected using this optical path space.

In addition, a transparent plate 7 for dustproofing is provided in these openings 5 and 6.
and 8 are fitted and glued.

As shown in FIG. 1(B), the transparent plate 7 has a structure in which a protruding step portion 9 is integrally molded at the center of the plate.

This protruding step portion 9 is fitted into the opening 5 of the case 3.

[Problems with background technology]

However, the above-mentioned photo incrushator is
Since a space is required inside the transparent plates 7 and 4 in which a portion of the transparent plates 7 and 8 can be housed, there is a drawback that a special case is required.

In manufacturing the transparent plates 2 and 8, the transparent plates 2 and 8 are inserted into each case from the lower open surface, and the protruding step portions 9 are fitted into the openings 5 and 6, respectively, and then fixed by adhesive or the like. Finally, insert the light-emitting element 1 and the light-receiving element 2 into each case and place them in the predetermined positions. ! , 1 constant. In this way, since the transparent plate is inserted and bonded from the inside of each case, detailed work is required, which has the drawback of poor workability in the manufacturing process.

[Purpose of the invention]

An object of the present invention is to provide a dust-proof photointerrupter that eliminates the above-mentioned conventional drawbacks and improves workability in the manufacturing process.

[Key points of the invention]

According to the photointerrupter of the present invention, the transparent plate on the side of the light emitting element and the light receiving element is formed as an integral structure, and this is fitted from the outside of the case into the opening of each case in which the light emitting element and the light receiving element are installed in advance. It is characterized by its intricacy.

An embodiment of the present invention will be described below with reference to the drawings.

FIG. 2 shows its structure, and the same parts as in FIG. 1 are given the same numbers. First, by a method such as injection molding, the non-transparent cases 3 and 4 are integrally molded together with the member 11 that connects them. This case 3.4 has opposing openings 5 and 6 through which light passes, similar to that in FIG. The materials for this case are:
It is common to use casene-filled polycargonate or noryl.

Next, the light emitting element 1 and the light receiving element 2 are attached to cases 3 and 4.
Insert it from the lower open surface and fix it in place. In this case, the light-emitting element 1 and the light-receiving element 2 are arranged to face each other with an opening 5.6 in between, and constitute a detection section that detects an object or the like through this optical path.

A transparent body 1 formed integrally is placed in the openings 5 and 6.
Insert and set 0. As shown in FIG. 3, this transparent body 10 has a transparent plate portion 12 on the light emitting element side and a transparent plate portion 14 on the light receiving element side facing each other, and a side connecting member 16 at one end of the transparent plate portion 12° 14. It is connected by On the outside of each transparent plate portion 12.14, protruding steps 18 and 2o are integrally molded, which can be fitted into the openings 5 and 6 of each case. This transparent body 1
As the material of o, a material with good light transmittance such as acrylic or polycarbonate is used, and it is manufactured by injection molding or the like.

However, the invention is not limited to this, as long as it has optical transparency for the emission wavelength of the light emitting element to be employed, for example, Ga
When using an As infrared light emitting diode, a material to which red dye is added may also be used.

In order to incorporate this transparent body 1o into the optical path, as shown in FIG.
Press and hold with your fingers in the direction shown. In this case, both ends are bent inward against the elastic force of the transparent body 1o until an appropriate distance is reached. While maintaining this state, the connecting portion 16 is inserted into the optical path first and brought into contact with the top surface of the connecting portion 11 of the cases 3 and 4, and the protruding step portions 1B and 20 are inserted into the openings 5 and 6. be inserted into. Thereafter, when the fingers holding the transparent body 10 are released, the transparent body 10 is fixed in a predetermined position by its own restoring force. As a result, the opening 5
゜6 is shielded from the outside, preventing dust etc. from entering the inside of the case. This state is shown in FIG.

It should be noted that the present invention is not limited to the above-described embodiments, but can be modified in various ways. For example, in the above example, the transparent body 10 was simply fitted into the opening of the case,
It can also be fixed with adhesive. In this case, it is advantageous for use in environments with severe vibrations.

Furthermore, the transparent body 10 can be fitted into a general photointeracitor that does not have a dust-proof structure. In this case, the detection optical path length will be shortened by the thickness of the transparent plate part, but the dust-proof structure can be easily formed. I can do it.

〔Effect of the invention〕

As explained above, according to the present invention, two transparent plates for dustproofing can be made into an integral structure and can be fitted into the optical path in the last step of assembling one photointerrupter, so the efficiency of assembly work can be significantly improved. Do 1.

Still, it is possible to easily make a dust-proof type photo interrupter without making any special modifications to the non-dust-proof type 7-oto interrupter.

[Brief explanation of the drawing]

FIG. 1(A) is a vertical sectional view showing the structure of a conventional photointerrupter, FIG. 1(B) is a perspective view showing a transparent body of FIG. 3 is a perspective view showing the transparent body of FIG. 2. FIG. 4 is a sectional view showing the completed state of the embodiment of FIG. 2. 1... Light emitting collector, 2... Light receiving element, 3, 4... Coos, 5, 6... Opening, 10... Transparent body, 12° 14... Transparent plate portion, 16... Connection Parts, 18゜Applicant's Representative Patent Attorney Takeshi Suzue Various Plans Figure 1 Figure 2

Claims (1)

[Claims] a non-light-transmitting first case having a first opening through which the light emitted from the light emitting element passes; A non-light-transmitting second case having second openings formed to face each other so as to receive light, and transparent plate portions corresponding to each other between the first and second openings set to face each other. 1. A photointeracitor comprising: a transparent body configured by elastically connecting the transparent plate portions to each other; and the transparent body is fitted between the openings.