JPS6325637Y2 - - Google Patents

Description

[Detailed description of the invention] (a) Field of the invention The present invention relates to the structure of a photoelectric switch incorporating photoelectric elements or light emitting elements such as phototransistors, photodiodes, and LEDs.

(b) Background of the invention In this type of photoelectric switch, it is necessary to position the photoelectric element, etc. on the optical axis of the light emitting/receiving optical system, and conventionally, a circuit board to which the photoelectric element, etc. are soldered is placed in a case. By regulating the position of the circuit board and aligning the optical axis of the lens attached to the front of the case with the center of the photoelectric element, etc., it was necessary to solder the photoelectric element to position it on the circuit board. In addition to requiring a jig, positioning and fixing the circuit board is troublesome, and the soldered photoelectric elements may be accidentally touched during assembly, making assembly difficult and making it difficult to obtain stable performance. There were flaws.

(c) Purpose of the invention The object of the present invention is to solve the above-mentioned problems and provide a structure of a photoelectric switch that allows easy relative positioning of a lens and a photoelectric element and is easy to assemble.

(d) Structure of the invention As shown in FIGS. 1 and 2, the present invention is to attach the lens of the lid to a holder 20 that fits inside a transparent cylindrical lid 2 whose front end surface is shaped like a lens. By providing an insertion hole 26 for a photoelectric element, etc., to which the outer periphery of the photoelectric element 7 fits in alignment with the optical axis of The lens optical axis and the center line of the photoelectric element are aligned, and the holding frame 10, which has a bottomed crown shape and is fitted to the outer periphery of the lid body and has an engagement mechanism between it and the lid body, is inserted from the rear of the lid body. By fitting into the body, the holder and the photoelectric element etc. are prevented from coming off from the lid body, and the lid body 2 and holder 2 configured in this way
0, the photoelectric element 7 and the holding frame 10 are inserted into the main body case 18 of the photoelectric switch from the front end, and the outer edge of the holding frame 10 is engaged with the ring-shaped protrusion on the inner peripheral surface of the case 18. The present invention provides a photoelectric switch having a fixed configuration.

(E) Example The figure shows an example of the present invention. The photoelectric switch of the present invention is shown in a side sectional view in FIG. 1 and an exploded perspective view in FIG. Reference numeral 2 denotes a transparent lid body, and the lid body 2 is made of transparent plastic and has a bottomed cylindrical shape with a front bottom surface shaped like a lens 1. On the outer peripheral surface 3 of the lid body 2, a plurality of protrusions 5 whose rear surface is a gentle slope 4 are formed in the circumferential direction. A flange portion 6 is formed on the outer periphery of the front end of the transparent lid body 2. A bottomed cylindrical plastic holding frame 10 having an insertion hole 9 for the connection pin 8 of the photoelectric element 7 in the bottom surface is fitted to the rear surface of the lid. Holding frame 10
A plurality of projecting pieces 13 extend forward from the front edge 12 of the peripheral wall 11 in a crown shape, and a front end 14 of each projecting piece 13 is formed.
is bent obliquely outward, and a cutout hole 16 having a front inner edge 15 is formed in each protrusion 13 at the position of this folding line. The front inner edge 15 of the cutout hole 16 of each protrusion 13 passes over the gentle slope of the rear surface of each protrusion 5 of the case 18 and engages with the protrusion, thereby coupling the transparent lid body 2 and the holding frame 10. A holder 20 has an outer diameter that fits inside the transparent lid body 2, and the photoelectric element 7 is inserted from the rear side into the insertion hole 26 for the photoelectric element etc., and is inserted and fitted into the transparent lid body 2 from the rear. Thereafter, the holding frame 10 is fitted onto the lid body 2 from the rear, and the photoelectric element 7 is held by connecting the lid body and the holding frame with the engagement mechanism consisting of the protrusion piece 12 and the protrusion 5 described above. The holder is fixed inside the lid body 2. In this state, the connection pins 8 of the photoelectric element 7 protrude rearward from the insertion holes 9 on the bottom of the holding frame 10, so they are soldered to the circuit board 21, and the lid body 2, holder 20, photoelectric element 7, and holding frame 10 are soldered to each other. , circuit board 2
The five-part integrated structure of No. 1 is inserted into the case 18 from the front side of the case 18. The case 18 has a ring-shaped protrusion 17 formed on the inner peripheral surface near the front end, and when the above-mentioned five-part integrated structure is inserted from the front end opening,
The outwardly bent end portions 14 of each of the protrusions 13 of the holding frame 10 are elastically stretched and overcome the ring protrusions 17, and the front edges 19 of the protrusions 13 cross the protrusions 1.
7 and the convex strip 17 is narrowed between the flange portion 6 on the front end outer periphery of the lid body 2 and the front end edge 19 of the protruding piece 13, so that the five-part integrated structure is assembled into a case. It is held and fixed within 18. The protruding strip 17 may be provided on the rear surface of the holding frame 10.

A slight gap is formed between the outer circumferential surface of the holding frame 10 and the inner circumferential surface of the case 18 so that the outer diameter of the tip bent portion 14 of the projection piece 13 fits into the inner circumferential surface of the case 18. Therefore, as shown in FIG. 3, a middle step part 22 is formed on the outer circumferential surface 3 of the transparent lid body 2, and the middle step part 22 is connected to the rear surface of the flange part 6.
The outer circumferential surface of the case 18 is adapted to fit into the inner circumferential surface of the ring-shaped protrusion 17 of the case 18. Also transparent lid body 2
Engagement steps 23 are formed on both sides of the inner surface of the cylindrical holder 20 on the rear surface of the engagement steps 23.
The front edges of the two are in contact with each other. A partition plate 24 for blocking external light is provided inside the plastic holder 20, and an aperture hole 25 is provided in the center of the partition plate 24 so as to coincide with the optical axis. In the rear part of the holder 20 from the partition plate 24, a photoelectric element insertion hole 26 is formed by narrowing the inner diameter to match the outer diameter of the photoelectric element 7. A recessed step 28 into which the flange 27 of the photoelectric element 7 fits is formed, and the photoelectric element 7
The flange portion 27 is held between this concave stepped surface and the bottom surface of the holding frame 10. The cap 29 attached to the rear end opening of the case 18 has a cord insertion hole 31 for pulling out the cord 30 and an LED for the power pilot.
In addition to the 32 exposure windows 33, holes for pouring the bond are provided.

When assembling, first insert the photoelectric element 7 into the holder 20, fit the holder 20 into the holding frame 10, make the connecting pin 8 protrude from the connecting pin insertion hole 9, and then insert the tip of the connecting pin 8. After soldering to the circuit board 21, the holding frame 10 and the transparent lid 2 are inserted into the case 18 and fixed to the case 18 by engaging them. Next, after a cap 29 is attached to the rear end of the case 18, a bond is poured to fix the circuit board 21 to the inner surface of the case 18 and the rear surface of the holding frame 10.

(f) Effect of the invention According to the invention, the photoelectric element is held between the holder and the holding frame, and the holding frame and the holder are securely attached to the transparent lid body through the protrusion formed on the inner peripheral surface near the front end of the case. Therefore, no special work is required to align the optical axes of the lens of the transparent lid body and the photoelectric element, and the holding frame and the transparent lid body can be combined by simply pushing them into the case. It has the advantage of being easy to perform, and the front edge of the outwardly bent portion of each protruding piece of the holding frame slides against the inner surface of the case and rides on the gentle slope of the protrusion, deforming elastically and becoming smoothly transparent. It engages with the lid and has the effect of preventing wobbling due to dimensional tolerances between the holding frame/case and the transparent lid.

[Brief explanation of drawings]

FIG. 1 is a side sectional view showing an embodiment of the present invention;
FIG. 2 is an exploded perspective view of the same as the above, and FIG. 3 is a perspective view of essential parts of the same. 1 is a lens, 2 is a transparent lid body, 3 is an outer peripheral surface, 4 is a gentle slope, 5 is a protrusion, 6 is a flange portion, 7 is a photoelectric element, 8 is a connection pin, 9 is a connection pin insertion hole, 10 is a holding frame , 11 is a peripheral wall, 12 is a front edge, 13 is a projecting piece, 14 is a front end of the projecting piece (tip bent piece), 15 is an inner edge of the front end, 16 is a notch hole, 17 is a ring-shaped protrusion,
18 is a case, 19 is a front edge of a projecting piece, 20 is a holder, 21 is a circuit board, 22 is a middle part, 23 is an engaging part, 24 is a partition plate, 25 is an optical axis hole, and 26 is a photoelectric element insertion 27 is a flange, 28 is a concave step, 29 is a cap, 30 is a cord, 31 is a cord insertion hole,
32 is the power pilot LED, 33 is the exposure window.

Claims (1)

[Scope of utility model registration request] A bottomed cylindrical transparent lid body with a front bottom surface shaped like a lens and a plurality of protrusions on the outer peripheral surface with a gently sloped rear surface, and a bottomed cylinder with a hole for inserting a connection pin for a photoelectric element, etc. in the rear bottom surface. A plurality of protrusions are extended forward from the front edge of the peripheral wall, and the front end of each protrusion is bent diagonally outward, and a notch hole having an inner edge of the front end is formed near the bending line. The holder has a holding frame formed in a piece, and a holder that fits into the transparent lid body and has a fitting hole into which a photoelectric element, etc. is fitted and inserted, and the holder holds the photoelectric element, etc. in the fitting hole. The holding frame is inserted into the transparent lid body from the rear, the holding frame is attached to the transparent lid body from the rear, and the front inner edge of the protruding piece extending from the holding frame is engaged with the outer circumferential surface protrusion of the transparent lid body. Insert the combined body of the transparent lid and the holding frame from the front side into a case that has a convex strip on the inner circumferential surface near the front end, and insert the front end edge of the outwardly bent part of the front end of the projecting piece of the holding frame into the above-mentioned case inside the case. A photoelectric switch in which the above-mentioned combined body is fixed in a case by being locked to the rear surface of a protruding strip.