JPH04117464U - optical coupling device - Google Patents

Abstract

(57) [Summary] [Purpose] To reduce the height of the optical coupling device when a rotating body is set. [Structure] A passageway 22 is passed through in parallel to the lead extraction direction and released in a direction perpendicular to the lead extraction direction.
The rotating body 23 is mounted from a direction perpendicular to the lead drawing direction, and the protrusion of the rotating body 23 is directed in a direction perpendicular to the lead drawing direction. [Effect] The rotating body 23 is brought closer to the lead frames 24 and 28, and the rotating body 23 is prevented from protruding in the opposite direction to the lead pulling direction.

Description

[Detailed explanation of the idea]

0001

[Industrial application field]

This invention is used for non-contact detection of the presence or absence of a rotating body as an object to be detected. This invention relates to the structure of a transmission type optical coupling device (photointerrupter).

0002

[Conventional technology]

Figure 6 shows a transmission type optical coupling device (photo interrupter) used in conventional encoders. ~12.

0003 As shown in FIG. 12, conventionally, the light emitting element 1 and the light receiving element 2 are each mounted on a lead frame. 3 and 4, and further internally connected by a gold wire 5. And each element 1, 2, transmit infrared rays using a transfer mold method as shown in Figures 10 to 12. It is coated with a transparent thermosetting resin 6 containing a resin or a dye that blocks visible light. Transparent resin bodies 9, 10 having convex portions 7, 8 that limit the range of light entering and exiting. is formed.

0004 Furthermore, as shown in FIGS. 6 to 9, the transparent resin bodies 9 and 10 are A light-shielding thermoplastic resin 1 is placed facing each other across a passage 11 through which a part of the rolling body X passes. The light-shielding resin body 13 is integrally sealed by injection molding according to No. 2. At this time, The light-shielding resin 12 is prevented from flowing into the convex portions 7 and 8 of the light-transmitting resin bodies 9 and 10. , the light emitted by the light emitting element 1 reaches the light receiving element 2 through the windows 7a and 8a. That's what I do.

[0005] In addition, the positioning for making these translucent resin bodies 9 and 10 face each other is shown in FIGS. 6 and 9. As shown in FIG. The guide pin (not shown) of the mold located in the hole 13a of the light-shielding resin body 13 It is assigned and carried out.

[0006] When in use, as shown in FIG. The body X is placed on the top of the optical coupling device, and the lower half of the rotating body I was using it.

[0007]

[Problem that the idea aims to solve]

In the structure of a conventional optical coupling device, as shown in FIG. The passageway 11 is formed along the orthogonal direction, and the passageway 11 is open at the top, so that the passageway 11 is A connecting portion connecting the light receiving and emitting portions of the light shielding resin body 13 is formed below the path 11. Ta. For this reason, it is necessary to avoid the connecting part and install the rotating body X above it. Ta.

[0008] In this case, in order to reduce the overall height when the rotating body X is set, Even if it is desired to design the horizontal axis of the rolling body X downward, it will be blocked by the connecting part.

[0009] As a result, a part (upper half) of the rotating body The length D protrudes on the opposite side to the lead-out direction and is connected in the lead-out direction. The vertical distance from the circuit board (hereinafter referred to as height dimension) increases by D, reducing the required storage space. The pace was getting bigger.

0010 In view of the above problems, the present invention reduces the height dimension when the rotating body is set, and The purpose of the present invention is to provide an optical coupling device that can reduce the required storage space.

[0011]

[Means to solve the problem]

The problem solving means according to claim 1 of the present invention is as shown in FIGS. , the light emitting element 25 mounted on the light emitting side lead frame 24, and the light receiving side lead frame 24. The light receiving element 29 mounted on the beam 28 is optically coupled with the light receiving element 29 across the passage 22. The passage shape of the rotating body 23 which is housed facing each other and rotates around the horizontal axis 42 on the passage path 22. In the optical coupling device for detecting the state of 8, and parallel to the direction in which the lead frames 24 and 28 are drawn out. It is open in orthogonal directions.

0012 The problem solving means according to claim 2 of the present invention is the optical coupling device according to claim 1, which includes: The passage path 22 is formed to penetrate through the lead frames 24 and 28 in the drawing direction. It is.

[0013] The problem solving means according to claim 3 of the present invention is the optical coupling device according to claim 1, which includes: The aperture window 41 that narrows down the light irradiated from the light emitting element 25 to the light receiving element 29 is located on the light emitting side. Formed long in the direction perpendicular to the lead frame 24 and the light-receiving side lead frame 28 It is what was done.

[0014]

[Effect]

In the problem solving means according to claim 1, the passageway 22 is connected to a lead frame 24. , 28, and parallel to the drawing direction of the lead frames 24, 28. The rotating body 23 is opened in the direction orthogonal to the lead frames 24 and 2 in the passage path 22 Attach from the direction perpendicular to 8.

[0015] Then, even if the rotating body 23 protrudes from the passageway 22, the lead frame 24 , 28, so it is difficult to pull out the lead frames 24, 28. It can prevent protrusion in the opposite direction. As a result, the rotating body 23 is set. Miniaturize by reducing the overall height dimension.

[0016] In the problem solving means according to claim 2, the passageway 22 is formed by connecting lead frames 24, 2. 8 in the drawing direction, so even if the rotating body 23 has a large diameter, , the design allows the horizontal axis of the rotating body and reduce the required storage space.

[0017] Also, the passage path 22 is formed parallel to the lead frames 24 and 28. The direction of movement of the rotating body 23 within the passage 22 is parallel to the lead frames 24 and 28. becomes. In order to cope with this, in claim 3, the diaphragm window 41 is connected to the lead frame 24. , 28 so that the rotating body 23 is attached to the side. In this case, the irradiation light is focused in the direction of rotation of the rotating body 23, and the Directivity is improved in the direction of travel within the road 22.

[0018]

【Example】

Hereinafter, one embodiment of the present invention will be described based on FIGS. 1 to 5.

[0019] Fig. 1 is a perspective view showing the usage state of an optical coupling device showing one embodiment of the present invention, and Fig. 2 is the same. A plan view of the bottom, FIG. 3 is a sectional view taken along the line A-A, and FIG. 4 is a cross-sectional view taken along the line B-B. 5A and 5B are diagrams showing a transparent resin body made of a transparent resin.

[0020] As shown in the figure, the optical coupling device of this embodiment is connected to a substrate 21 and passes through a passage 22. The passing state of the rotating body 23 (encoder disk), which is the object to be detected, is detected without contact. It is a photo encoder that emits light, and a light emitting element 25 is mounted on a light emitting side lead frame 24. These are resin-sealed with a transparent resin 26 to form a light-emitting side transparent resin body 27. The light-receiving element 29 is mounted on the light-receiving side lead frame 28, and these are translucent. The light-receiving side transparent resin body 31 is formed by resin sealing with a transparent resin 26, and the light-emitting side transparent resin body 31 is formed. The resin body 27 and the light-receiving side transparent resin body 31 are optically coupled with the passage path 22 in between. The outer case is made of a light-shielding resin 32 and is opposed to each other so as to prevent the intrusion of ambient light. The passageway 22 is covered with a light-shielding resin body 33 as a light-emitting side lead frame. It penetrates parallel to the pull-out direction (vertical direction) of the frame 24 and the light-receiving side lead frame 28. It was formed by

[0021] The board 21 is a printed wiring board as shown in FIG. , 28 and are electrically connected by solder H.

[0022] As shown in FIG. 4, the light emitting element 25 is, for example, an infrared light emitting diode. The light receiving element 29 is, for example, a photodiode, and each has a lead. It is mounted on frames 24 and 28 and is internally connected with bonding wire 35. Ru.

[0023] The light-emitting side transparent resin body 27 and the light-receiving side transparent resin body 31, as shown in FIG. The element 25 and the light receiving element 29 are made of thermosetting translucent resin 26 such as epoxy resin. It is made by primary molding using a casting method or a transfer method. stop A convex portion 36 is provided on the opposing surfaces of both the transparent resin bodies 27 and 31 to limit the range of light entering and exiting. is horizontally long, that is, perpendicular to the direction in which the lead frames 24 and 28 are pulled out. It is formed long in the direction.

[0024] Here, the reason why the convex portion 36 is formed horizontally is that the passage path 22 is arranged in the vertical direction. As a result, when the object to be detected moves vertically, the directivity angle of the passing light should be adjusted relative to the direction of movement. This is to narrow down the search results.

[0025] The light-shielding resin body 33 is made of heat-resistant material such as polyphenylene sulfide, as shown in FIGS. The light-emitting side transparent resin body 2 is injection molded using a light-shielding resin 32 having plasticity. 7, and a light-receiving side housing section 37 that stores the light-receiving side translucent resin body 31. The storage portion 38 and both storage portions 37 and 38 are connected from these sides with the passageway 22 in between. and a connecting portion 39 for connecting. As a result, the light-shielding resin body 33 is 2, it is formed into a U-shape in plan view so that the rotating body 23 can be attached from the side. .

[0026] The light-emitting element 25 and the light-receiving element are arranged at the center of both opposing surfaces of the light-shielding resin body 33. A diaphragm window 41 for narrowing down the light irradiated to the child 29 is provided on the transparent resin body 27, 3. 1 in a direction perpendicular to the lead frames 24 and 28 (horizontal direction). It is formed long in the direction (direction).

[0027] Here, the rotating body 23 used in this embodiment has a plurality of slits 2 as shown in FIG. 3a, and the supporting part of the equipment body in which they are used (not shown). It is supported by a cylindrical shaft (not shown) and is rotatable around a horizontal axis 42.

[0028] In the figure, 51 indicates the position of the light-transmitting resin bodies 27 and 31 in the mold during molding of the light-shielding resin body 33. It is a circular hole for determining.

[0029] The optical coupling device described above is manufactured as follows.

[0030] First, the light emitting element 25 and the light receiving element 29 are mounted on the lead frames 24 and 28, respectively. The light emitting element 25 and the light receiving element 29 are bonded to the lead frames 24 and 28. The wires are connected internally using wires 35.

[0031] Next, these are molded using a translucent resin 26 using a casting method or a transfer method. Separate and independent light-transmitting resin bodies 27 and 31 are primary-molded.

[0032] At this time, the convex portion 36 is formed long in the horizontal direction.

[0033] Furthermore, the transparent resin bodies 27 and 31 are arranged so as to be optically coupled with the passageway 22 in between. Insert it into the mold with the facing direction, and use the translucent resin 32 to make an injection mold. The light-shielding resin body 33 is formed by secondary molding using a hard method or the like.

[0034] At this time, the aperture window 41 is shaped into a horizontally elongated shape corresponding to the convex portion 36 of the translucent resin body 27, 31. Furthermore, the passageway 22 is formed into a vertically elongated shape with open sides.

[0035] When attaching to the board 21, as shown in FIG. Place the board in the drawing direction, and connect each lead frame 24, 28 to the desired contact point. Fix it with solder H.

[0036] In addition, when in use, as shown in FIG. The horizontal shaft 42 of the rotating body 23 is rotated by the supporting part of the main body of the device (not shown). Support freely.

[0037] When the rotating body 23 is rotated, the light emitting element 25 is caused to emit light, and this light is rotated. The rotating body depends on whether it passes through the slit 23a of the body 23 and reaches the light receiving element 29. 23's rotational position, rotational speed, etc. are detected.

[0038] At this time, the passage path 22 is made parallel to the direction in which the lead frames 24 and 28 are pulled out, In addition, it is open in a direction perpendicular to the direction in which the lead frames 24 and 28 are pulled out. Then, the rotating body 23 is mounted in the passageway 22 from a direction perpendicular to the lead frames 24 and 28. I can wear it.

[0039] Then, even if the rotating body 23 protrudes from the passageway 22 as shown in FIG. Since it only protrudes in the direction perpendicular to the lead frames 24 and 28 (laterally), It is possible to prevent the frames 24 and 28 from protruding in the direction opposite to the pull-out direction.

[0040] Moreover, the passage path 22 is provided to penetrate through the lead frames 24 and 28 in the drawing direction. Therefore, even if the rotating body 23 has a large diameter, it will not be obstructed by the connecting part as in the conventional case. The horizontal axis of the rotating body Note that the rotating body 23 is If the size is too large, a notch is also provided on the circuit board to be mounted to avoid the rotating body 23. Just set it up.

[0041] Therefore, the overall height dimension in the lead pulling direction when the rotating body 23 is set. is the diameter of the rotating body 23 or the height of the optical coupling device, whichever is larger. The amount of space required can be reduced compared to conventional methods.

[0042] Further, in this case, the aperture window 41 is extended in the direction perpendicular to the lead frames 24 and 28. Even if the rotating body 23 is mounted on the side, it will not rotate in the rotating direction of the rotating body 23. The irradiation light can be narrowed down, and the S/N ratio can be improved by improving the directivity. .

[0043] It should be noted that the present invention is not limited to the above-mentioned embodiments, but may be modified within the scope of the present invention. Of course, many modifications and changes may be made to the embodiments described.

[0044] For example, in the above configuration, the light-transmitting resin bodies 27 and 31 are resin-sealed with the light-shielding resin 32. However, instead of this light-shielding resin body 33, a separate body is formed. It may also be a device that can be simply inserted into the case using an external case.

[0045] Further, the rotating body 23 is not limited to a disc-shaped one, and for example, the rotating body 23 rotates around a horizontal axis 42. It may be pendulum-shaped.

[0046]

[Effect of the idea]

As is clear from the above explanation, according to claim 1 of the present invention, the passageway is formed by a lead frame. Parallel to the pull-out direction of the lead frame and perpendicular to the pull-out direction of the lead frame Since it is open in the direction, the rotating body can be mounted in the passage from the direction perpendicular to the lead frame. When the lead frame is installed, the protrusion of the rotating body from the passage can be directed in the direction perpendicular to the lead frame. This reduces the height dimension in the lead pulling direction when the rotating body is set. can be set.

[0047] According to claim 2 of the present invention, the passageway is provided so as to pass through the lead frame in the drawing direction. Because of this, even if the diameter of the rotating body is large, it will not be blocked by the connecting part as in the conventional case. The horizontal axis of the rotating body can be placed at the bottom without any problems, and the space required when including the rotating body can be reduced. can reduce costs.

[0048] According to claim 3 of the present invention, the aperture window is formed long in the direction orthogonal to the lead frame. Therefore, even if the rotating body is mounted on the side, the irradiation light will not be directed in the direction of rotation of the rotating body. It is an excellent lens that can narrow down the target area and improve the S/N ratio by improving directivity. effective.

[Brief explanation of drawings]

FIG. 1 is a perspective view showing a state in which an optical coupling device according to an embodiment of the present invention is used.

FIG. 2 is also a plan view thereof.

FIG. 3 is a cross-sectional view taken along the line AA.

FIG. 4 is a sectional view taken along line BB.

FIG. 5 is a diagram similarly showing a transparent resin body.

FIG. 6 is a perspective view showing a conventional optical coupling device in use.

FIG. 7 is a plan view thereof as well.

FIG. 8 is a cross-sectional view taken along the line C-C.

FIG. 9 is a sectional view taken along line DD.

FIG. 10 is a diagram similarly showing a transparent resin body.

FIG. 11 is also a plan view thereof.

FIG. 12 is also a sectional view thereof.

[Explanation of symbols]

22 Passage route 23 Rotating body 24 Light emitting side lead frame 25 Light emitting element 28 Light receiving side lead frame 29 Light receiving element 33 Light-shielding case 41 Aperture window 42 Horizontal axis

Claims (3)

[Scope of utility model registration request] Claim 1: A light-emitting element mounted on a light-emitting side lead frame and a light-receiving element mounted on a light-receiving side lead frame are housed in a light-shielding case, facing each other so as to be optically coupled across a passageway. , an optical coupling device that detects the passage state of a rotary body rotating around a horizontal axis on a passageway, the passageway being parallel to the direction in which the lead frame is drawn out, and in a direction perpendicular to the direction in which the lead frame is drawn out. An optical coupling device characterized in that it is open. 2. The optical coupling device according to claim 1, wherein the passage path is formed to penetrate the lead frame in the drawing direction. 3. In the optical coupling device according to claim 1, the aperture window that narrows down the light irradiated from the light emitting element to the light receiving element is formed long in a direction perpendicular to the light emitting side lead frame and the light receiving side lead frame. An optical coupling device characterized by: