JPH0621267U - Photo-interrupter - Google Patents

Abstract

(57) [Abstract] [Purpose] In a photo interrupter in which a light emitting unit and a light receiving unit are arranged to face each other with an object passageway in between, to improve the distinguishability. A photo interrupter in which a light emitting unit 1 and a light receiving unit 2 are arranged to face each other with an object passage X in between,
In the photo interrupter including the case 3 in which the holder 7 that integrally holds the light-receiving portion 2 and the light-shielding plate 6 having the slit 5 is held, the identification marking 9 is provided on the portion 6a of the light-shielding plate 6 embedded in the holder 7. It is characterized in that it is formed, and further the holder 7 is made of transparent resin.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a photo interrupter capable of contactlessly detecting the presence or absence of an object to be detected passing on a passage.

[0002]

[Prior art]

 The structure of a conventional photo interrupter will be described with reference to FIG. 3 (a) is a front view, FIG. 3 (b) is a rear view, FIG. 3 (c) is a sectional view taken along the line BB ′ of FIG. 3 (a), and FIG. 3A is a cross-sectional view taken along the line CC ′ of FIG. 3A, and FIG. 3E is a cross-sectional view taken along the line DD ′ of FIG.

The photointerrupter shown in FIG. 3 is formed by molding a light emitting portion 1 formed by molding a light emitting element (for example, a light emitting diode) with a transparent resin and a light receiving element (for example, a phototransistor) by a transparent resin. The light receiving section 2 is housed in a case 3 made of a light-shielding material, which is arranged so as to face each other with the object passage X interposed therebetween, and the light receiving section 2 and the light receiving section 2 housed in the case are connected to the object passage X. A light projecting section 4a and a daylighting section 4b which are open toward the opposite case surfaces 3a and 3b are provided. On the other hand, in order to enhance the detection accuracy (resolution) of the object to be detected, a light shielding plate 6 having a slit 5 and a holder 7 in which the light receiving portion 2 is integrated are provided, and are fixed to the case 3 by an adhesive 8. Done ing.

In the photointerrupter having the above-described configuration, in order to provide a photointerrupter and its components that can be easily identified, a molding material for the holder 7 in which the light-shielding plate 6 having the slit 5 and the light-receiving unit 2 are integrated is formed. The color tone was changed to something other than black (for example, materials such as red and blue were used).

[0005]

In the conventional photo interrupter, the color tone of the molding material of the holder must be made to correspond to each light shielding plate having slits that determine the individual resolution in order to facilitate identification. Therefore, a material with a color tone corresponding to various kinds of resolution is required, and it is difficult to manage.

The present invention aims to solve the above problems.

[0007]

[Means for Solving the Problems]

 The present invention is a photo interrupter in which a light emitting portion and a light receiving portion are opposed to each other with an object passageway in between, and a holder for integrally holding a light shielding plate having a light receiving and emitting portion and a slit is housed. In the photo interrupter having the above case, the marking for identification is formed on the light shielding plate, and the holder is made of transparent resin.

[0008]

[Action]

 By forming the identification marking on the light-shielding plate and further forming the holder with a transparent resin, it is possible to easily confirm the identification of the photo interrupter having a variety of resolution slits as compared with the conventional photo interrupter.

[0009]

【Example】

 An embodiment of the present invention will be described with reference to FIGS. 1 is a front view of a photo interrupter according to this embodiment, and FIG. 2 is a plan view (a) and a left side view (b) of the holder shown in the embodiment of FIG. 1 and A- in FIG. 2 (a). It is an A'sectional view (c).

With respect to the configuration of the present embodiment, only the points different from the conventional example will be described. As shown in FIG. 2, a marking 6 (for example, letters, numbers, etc.) 9 for identification is formed by half-etching or punching on the portion 6a of the light-shielding plate 6 having the slit 5 which is embedded in the holder 7. The holder 7 including the plate 6 and the light receiving portion 2 is formed of transparent resin, and then inserted into the case 3 as shown in FIG. At this time, the tip portion of the holder 7 appears on the front surface of the case 3, and the identification marking 9 can be confirmed through the transparent resin.

Since the resolution of the photo interrupter is determined by the slit 5, and the slit 5 is formed on the light shielding plate 6 by etching or punching, it corresponds to the shape of the resolution slit 5 in the embedded portion 6a of the light shielding plate 6 at the same time. If the identification markings 9 are paired and formed by half etching or punching, the tip of the holder 7 appears on the front of the case 3 after the finished product, and the identification markings 9 can be easily confirmed and the resolution is improved. (Model characteristics) can be identified.

[0012]

[Effect of device]

 As described above, in the photo interrupter, the identification marking is formed on the light-shielding plate, and the holder is made of the transparent resin, so that the photo interrupter having more kinds of resolution slits than the conventional photo interrupter can be identified. It can be checked easily and it is not necessary to change the color tone of the holder.

[Brief description of drawings]

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

2A is a plan view of the holder shown in FIG. 1, FIG. 2B is a left side view thereof, and FIG. 2A is a sectional view taken along line AA ′ of FIG.

3A and 3B are views showing a conventional example, FIG. 3A is a plan view, FIG. 3B is a rear view, and FIG. 3C is B- of FIG.
It is a B'sectional view, (d) is CC 'sectional drawing of a figure (a), (e) is DD' sectional drawing of a figure (a).

[Explanation of symbols]

 1 Light-emitting part 2 Light-receiving part 3 Case 5 Slit 6 Light-shielding plate 7 Holder 9 Identification marking X Object passage

Claims (1)

[Scope of utility model registration request] 1. A photo interrupter in which a light emitting portion and a light receiving portion are opposed to each other with an object passageway in between, and a holder for integrally holding a light shielding plate having a light receiving and emitting portion and a slit is housed. In the photo interrupter with a case, the identification marking is formed on the light shielding plate,
Further, a photo interrupter in which the holder is made of a transparent resin.