JP3280554B2 - Optical device, optical coupling device, and rotation detection sensor having the same - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optical device, and more particularly, to a light emitting device that emits a signal light in response to an electric signal, a light receiving device that receives a signal light and emits an electric signal, and a light emitting unit and a light receiving unit that are integrally provided and detected. The present invention relates to an optical coupling device for detecting the presence or absence of an object without contact, and a rotation detection sensor having the same.

[0002]

2. Description of the Related Art Hereinafter, a conventional optical device will be described using an optical coupling device which integrally includes a light emitting portion and a light receiving portion and detects the presence or absence of an object without contact.

FIG. 4 is a longitudinal sectional view showing the structure of a conventional optical coupling device.

The conventional optical coupling device comprises a light emitting element 1 and
A light-receiving element 2; an outer case 3 which is disposed so as to oppose the light-emitting element 1 and the light-receiving element 2 so as to be optically coupled to each other with a predetermined distance (passage path A of an object to be detected) and integrally housed therein; An adhesive resin 4 for fixing the light emitting element 1 and the light receiving element 2 in the outer case 3.

The light emitting element 1 has a light emitting chip (not shown) on an external connection lead terminal 5 formed of a lead frame.
Is mounted, and the light emitting chip is sealed with a translucent resin 6.

The light receiving element 2 has a light receiving chip (not shown) on an external connection lead terminal 7 formed of a lead frame.
Is mounted, and the light receiving chip is sealed with a translucent resin 8.

The outer case 3 is made of a light-shielding resin,
A plurality of storage portions 9 and 10 for individually storing the light emitting element 1 and the light receiving element 2 at predetermined intervals are provided, and a position corresponding to the light emitting surface of the light emitting element 1 and the light receiving surface of the light receiving element 2 is provided. Are formed with slits 11 and 12, respectively.

As described above, in the above-described optical coupling device, the two elements 1 and 2 are fixed by injecting the adhesive resin 4 into the bottom surface and the inner walls of the storage portions 9 and 10 and curing the resin. 5A and 5B are diagrams for explaining the structure of another conventional optical coupling device, in which FIG. 5A is a longitudinal sectional view showing a state after the optical semiconductor element is fixed (completed product), and FIG. FIG. 4 is a diagram illustrating a state before fixing of the semiconductor element. About the optical coupling device,
Only differences from the optical coupling device shown in FIG. 4 will be described.

The structure of the conventional optical coupling device for fixing the two elements 1 and 2 is different from the above-described optical coupling device.

In other words, instead of the fixing with the adhesive resin 5 shown in FIG. 4, in this conventional example, as shown in FIG. A heated metal rod is pressed against a portion 3a on the back side of each of the elements 1 and 2 adjacent to the bottom surface of each of the elements 1 and 2, as shown in FIG.
As shown in (a), each element 1 and 2 is fixed by deforming a portion 3a close to the bottom surface on the back side of each element 1 and 2 into a substantially U-shape in cross section.

FIG. 6 is a longitudinal sectional view showing the structure of still another conventional optical coupling device. Only the differences between the optical coupling device and the optical coupling device shown in FIG. 4 will be described.

The optical coupling device of this conventional example differs from the above-described optical coupling device in the structure for fixing the two elements 1 and 2.

That is, instead of fixing with the adhesive resin 5 shown in FIG.
The elements 1 and 2 are fixed by hooks 12 and 12 provided integrally with the element 0, respectively.

As described above, in each of the conventional optical coupling devices described above, each of the elements 1 and 2 is inserted from the bottom side of the outer case 3 as shown in FIG. In the figure, only the light emitting element 1 is shown as an optical semiconductor element.

[0015]

However, the above-mentioned conventional optical coupling device has the following three problems.

First, there is a problem of a method of fixing each of the elements 1 and 2 to the storage portions 9 and 10.

That is, in the optical coupling device shown in FIG.
It is necessary to control the viscosity of the adhesive resin 4 and the curing time, and also to perform a resin injection operation that is difficult to automate, which increases the operation time and causes an increase in cost. Further, the adhesive resin 4 adheres to unnecessary portions, which is a factor of poor appearance.

Next, in the optical coupling device shown in FIG. 5, since the fixing of each of the elements 1 and 2 is performed by a thermal deformation method, the temperature control of the heating metal rod and the management of the pressing of the heating metal rod against the outer case 3 are performed. Maintenance is complicated.

Second, there is a problem such as deflection (bending) of the external connection lead terminals 5 and 7.

That is, all the optical coupling devices shown in FIGS. 4 to 6 insert the elements 1 and 2 from the bottom side of the outer case 3 as shown in FIG. As a result, the external connection lead terminals 5 and 7 were easily deformed by an external force or the like, and the deflection or the like occurred.

The deflection and the like cause a poor insertion when automatically mounting (inserting the external connection lead terminals 5 and 7) on a substrate or the like on which the optical coupling device is mounted.

Third, there is a problem that the detection position of the object to be detected is lowered by the top surface of the outer case 3.

That is, in each of the optical coupling devices shown in FIGS. 4 to 6, each element 1,
A top surface is required for fixing the device 2, and the position of each of the elements 1 and 2 is lowered by the amount of the top surface. In addition, there were restrictions on making the top surface thinner.

This problem arises, for example, when the optical coupling device is used as a rotation detection sensor for a rotation detection wheel mechanically connected to a tape reel of a video or the like, as shown in FIG. This causes a problem that the top surface of the wheel hits the rotation detection wheel 13, and in order to solve this problem, it is necessary to increase the distance of the detected portion 13 a of the rotation detection wheel 13 as shown in FIG. 9. . 8 and 9, reference numeral 14 denotes an optical coupling device.

However, in this case, as shown in FIG. 10, there is a problem in that the rotation detecting wheel 13 is newly formed, and the rotation detecting wheel 13 itself shakes and the optical coupling device 14 is brought into contact. Occurred.

The above-mentioned rotation detecting wheel 13 has, for example, a detection portion 13a arranged at a predetermined interval at an outer peripheral end of a columnar main body.

In addition, as shown in FIG. 8, the interval between the rotation detecting wheel 13 and the main board 15 is often large, and the external connection lead terminals 5, 7 and the outer case 3 are set to be long. Then, as described in the second problem, the dispersion of the external connection lead terminals 5 and 7 is further increased, so that the sub-substrate 16 on which the optical coupling device 14 is mounted, the lead wire 17, the connector 18, and the like. Connection parts were required.

The object of the present invention is to solve the above problems.

[0029]

An optical device according to a first aspect of the present invention includes an optical semiconductor element and an outer case for housing the optical semiconductor element, and the outer case has an upper opening.
Comprising an element storage recess, wherein the element storage recess
In an optical device containing an optical semiconductor element, a first positioning / fixing projection is provided on the back surface of the optical semiconductor element , and the first positioning / fixing projection is provided on the optical semiconductor element rear side of the outer case .
1 is provided with a positioning fixing recess for engaging and holding the positioning fixing projection, and the fixing recess of the outer case is provided.
Notches are provided on two opposing surfaces that are not provided .

In the optical device according to a second aspect of the present invention, in the optical device according to the first aspect, the first position is provided.
The light of the optical semiconductor device is different from the position of the fixed fixing convex portion.
A second positioning and fixing projection is provided at a position corresponding to the road,
The second positioning / fixing projection is engaged with the outer case.
It is characterized by having a slit for holding .

Furthermore, the optical device according to claim 3 of the present invention is an optical device according to claim 1 or 2, wherein the outer
From the bottom of the element storage recess to the outer case,
And a lead terminal positioning through-hole penetrating through the bottom surface .

In addition, the optical coupling device according to claim 4 of the present invention is an optical device according to any one of claims 1 to 3.
A light-emitting element comprising the optical semiconductor element and a light-receiving element
Element, and the light emitting element and the light receiving element pass through the object to be detected.
To provide an optical cable and
Individually stored in a plurality of device recesses.
It is characterized in that that.

In addition, in the rotation detecting sensor having the optical coupling device according to the fifth aspect of the present invention, in the optical coupling device according to the fourth aspect, the object to be detected is a rotation sensor mechanically connected to a tape reel. It is characterized by comprising a detection spring.

In addition, in the rotation detecting sensor having the optical coupling device according to claim 6 of the present invention, in the optical coupling device according to claim 5, the height of the outer case and the length of the lead terminal for external connection are set. The length of the rotation detection wheel and the substrate on which the optical coupling device is mounted are compensated for.

[0035]

According to the above construction, in the optical device according to the first aspect of the present invention , the first positioning / fixing convex portion is provided on the back surface of the optical semiconductor element , and the element housing concave portion having an upper opening is provided.
A positioning fixing concave portion for engaging and holding the first positioning fixing convex portion is provided on the optical semiconductor element rear side of the provided outer case, and the fixing concave portion of the outer case is provided.
It is a structure in which notches are provided on two opposing surfaces that are not cut, so that the optical semiconductor element is inserted into the outer case at the time of assembling the optical device , and is provided on the back surface of the optical semiconductor element.
A first positioning / fixing projection and the optical half of the outer case ;
The optical semiconductor element can be positioned and fixed in the outer case by engaging with the first positioning and fixing recess provided on the back side of the conductor element . Optical semiconductor
The insertion distance of the element can be reduced,
The top surface of the outer case is no longer necessary,
The heart can be set high and the size of the optical device can be reduced.
Furthermore, the outer case can have elasticity,
The outer casing of the optical semiconductor device provided with the
Insertion into the socket.

In the optical device according to a second aspect of the present invention, the position of the first positioning / fixing projection is different from the position of the first positioning / fixing projection.
Second positioning at a position corresponding to the optical path of the optical recording semiconductor device
A fixing projection is provided, and the second positioning is provided on the outer case.
Since structure formed by providing a slit for engaging and holding the fit convex fixing part, it is possible to alternate the slit and the optical path for optical transmission, separately, with the recess for the optical path forming (slit) becomes unnecessary And the optical semiconductor element and the outer package.
The engagement with the base can be improved.

Further, in the optical device according to the third aspect of the present invention, the outer case is provided outside the bottom surface of the recess for housing the element.
Through hole for lead terminal positioning penetrating through the bottom of the mounting case
Since a provided structure, the external connection leads of the optical semiconductor element
By inserting the terminal into the lead terminal positioning through hole,
As a result, it is possible to reduce variations in the deflection of the external connection lead terminals .

In addition, the optical coupling device according to claim 4 of the present invention provides a light emitting device and a light receiving device comprising the optical semiconductor device.
And the light-emitting element and the light-receiving element
To be optically coupled to each other,
Since the structure is individually housed in a plurality of element housing recesses, the positioning and fixing provided in the optical semiconductor element are provided.
And a positioning fixing recess provided on the outer case.
Position and secure the optical semiconductor element in the outer case.
And the insertion distance of the optical semiconductor device.
Reduction and high setting of the optical axis center of the optical device and the optical device
Size, or fluctuation of runout of external connection lead terminals
Key can be reduced .

In addition, in the rotation detecting sensor having the optical coupling device according to the fifth aspect of the present invention, since the object to be detected is a rotation detecting spinning wheel mechanically connected to a tape reel, it is particularly preferable. This is effective when used as a rotation detection sensor for a tape reel of a video or the like.

In addition, in the rotation detecting sensor having the optical coupling device according to claim 6 of the present invention, the height of the outer case and the length of the lead terminal for external connection are determined by the rotation detecting wheel and the light. Since the length is used to compensate for the distance from the substrate on which the coupling device is mounted, even if the height of the optical coupling device is set high, the fluctuation of the lead terminals for external connection is small and automatic mounting is possible.

[0042]

[0043]

BEST MODE FOR CARRYING OUT THE INVENTION An optical device according to an embodiment of the present invention will now be described. As in the prior art, an optical coupling device which integrally includes a light emitting portion and a light receiving portion and detects the presence or absence of an object without contact is provided. This will be described with reference to FIG.

FIG. 1 is a perspective view for explaining the structure of the optical coupling device.

The optical coupling device of the present embodiment has a light emitting element 2
1, light receiving element 22, light emitting element 21 and light receiving element 22
And an outer case 23 which is disposed opposite to each other so as to be optically coupled with a predetermined interval (passage path A of the detection object) and integrally accommodates and holds.

The light emitting element 21 has a light emitting chip (not shown) such as a light emitting diode chip mounted on an external connection lead terminal 24 formed of a lead frame, and the light emitting chip is sealed with a transparent resin 25. Be done. The second positioning convex fixing portions 25a for the light emitting chip of the light emitting surface optical path and positioned in a position corresponding to the fixing of the light-transmissive resin 25 is provided, the second of the translucent resin 25 First positioning and fixing projection 25 for positioning and fixing on a side different from the side on which the positioning and fixing projection 25a is provided.
b is provided.

In the light receiving element 22, a light receiving chip (not shown) such as a phototransistor is mounted on an external connection lead terminal 26 formed of a lead frame, and the light receiving chip is sealed with a light transmitting resin 27. It becomes. The second positioning convex fixing portions 27a for the optical path and positioned and fixed at a position corresponding to the light receiving surface of the light receiving chip light-transmitting resin 27 is provided, the second of the translucent resin 27 First positioning and fixing projection 27b for positioning and fixing on a side different from the side on which the positioning and fixing projection 27a is provided
Is provided.

The outer case 23 is made of a light-shielding resin, and is provided with a plurality of storage portions 28 for separately storing the light emitting element 21 and the light receiving element 22 at predetermined intervals (passage A of the detected object). , 29, and slits 30, 31 are formed at positions corresponding to the light-emitting surface of the light-emitting element 21 and the light-receiving surface of the light-receiving element 22, respectively.
A notch 32 is formed on two opposing surfaces on which the slits 30 and 31 or the positioning and fixing recesses 23a and 23a are not formed.

The storage sections 28 and 29 are provided with the respective elements 21 and 22
Is formed from a concave portion (including a through-hole) having no top surface so that can be stored from above the exterior case 23.

[0050] The slit 30, 31 is the second positioning convex fixing portion is lifted and the detection accuracy of the detected object 2
5a and 27a are engaged and held. The positioning and fixing recesses 23a and 23a are for engaging and holding the first positioning and fixing projections 25b and 27b. , 29 in order to reduce deformation of the outer case 23 when the respective elements 21 and 22 are inserted (assembled).

As described above, according to the optical coupling device of the present embodiment, the positioning and fixing projections 25a, 2
5b, 27a, 27b, and the positioning and fixing projections 25a, 25b, 27a, 27b
Are provided with the slits 30 and 31 for engaging and holding the optical coupling device, and the positioning and fixing concave portions 23a and 23a, so that the two elements 21 and 22 are inserted into the storage portions 28 and 29 of the outer case 23 when assembling the optical coupling device. , Positioning and fixing projections 25a, 25b, 27a, 27 provided on the respective elements 21, 22
b and slits 30 and 3 provided in the outer case 23
1 and the recesses 23a, 23a for positioning and fixing, the two elements 21, 22 can be positioned and fixed to the storage portions 28, 29 of the outer case 23, and can be formed by a conventional adhesive resin or thermal deformation. The optical coupling device can be easily assembled without using any means.

The second positioning and fixing projection 25
a, 27a and slits 30, 31
Since the structure is formed at a position corresponding to the optical path between the optical fibers 22, it is possible to use both the positioning and fixing concave portion and the optical path for transmitting light. Therefore, a separate optical path forming or positioning and fixing concave portion is unnecessary. Becomes

Further, the positioning and fixing projections 25a,
A plurality of positioning protrusions 25a, 25b, 27a, 27b of the exterior case 23 are formed at positions corresponding to the optical paths of the respective elements 21, 22 and at positions different from the positions. Since the slits 30 and 31 and the positioning and fixing recesses 23a and 23a are formed at positions corresponding to the above, the engagement between the elements 21 and 22 and the outer case 23 is improved.
That is, highly accurate positioning can be performed.

In addition, since the outer case 23 is provided with the cuts 32 for facilitating the storage of the respective elements 21 and 22, the outer case 23 can have elasticity and the positioning and fixing protrusions can be provided. Parts 25a, 25b, 27
a, outer case 2 of elements 21 and 22 provided with 27b
3 can be easily inserted into the outer case 2 generated during assembly.
3 can be reduced. Further, the assembling time can be reduced and the cost can be significantly reduced.

In addition, the outer case 23 is provided with storage portions 28 and 29 having an open upper portion, and the devices 21 and 22 are stored in the storage portions 28 and 29.
The insertion distance of the optical coupling device 1 and 22 can be reduced, the top surface of the exterior case 23, which has been required conventionally, is not required, the center of the optical axis of the optical coupling device can be set high, and the optical coupling device can be downsized. is there.

Next, the internal structure of the optical coupling device will be described below.

FIG. 2 is a longitudinal sectional view of the optical coupling device according to the present embodiment.

The internal structure of the outer case 23 described above has a structure in which the outer case 23 is provided with lead terminal positioning through holes 33, 33 penetrating from the bottom surfaces of the storage portions 28, 29 to the bottom surface of the outer case 23. , Each element 21,
By inserting the external connection lead terminals 24, 26 into the lead terminal positioning through holes 33, 33, the fluctuation of the runout of the external connection lead terminals 24, 26 can be reduced. is there.

This makes it possible to easily mount the optical coupling device to the member to be mounted, and particularly to insert the external connection leads 24 and 26 during automatic mounting (insertion of the external connection lead terminals 24 and 26). Defects are prevented.

The optical coupling device having the structure shown in FIG. 2 is particularly effective when used as a rotation detection sensor for a rotation detection wheel mechanically connected to a tape reel for a video or the like.

Hereinafter, a specific description will be given with reference to FIG. FIG. 3 is a diagram for explaining use as a rotation detection sensor. In the figure, 34 is an optical coupling device, and 35 is a main board.

That is, the rotation detecting wheel 13 mechanically connected to a tape reel of a video or the like is structurally distant from the main board 35 on which components are mounted in many cases. Even if it is arranged near the rotation detecting wheel 13, it is possible to compensate for the distance L (in the conventional example, the sub-board,
However, in the structure of the optical coupling device shown in FIG. 2, the height of the outer case 23 and the lengths of the external connection lead terminals 24 and 26 must be set long as shown in FIG. Accordingly, even if the height of the optical coupling device 34 is set to be high, variation in fluctuation of the external connection lead terminals 24 and 26 is small, and automatic mounting is possible.

The housings 28, 29 of the outer case 23
, The center of the optical axis can be set high, and the detected portion 13 of the rotation detection pulley 13 can be set high.
It is not necessary to increase the distance a.

Although the above embodiment has been described using the optical coupling device, the above structure is adopted in a single unit such as a light emitting device and a light receiving device in which an optical semiconductor element is housed and held in an outer case. Needless to say, the same operation and effect can be obtained.

[0065]

As described above, according to the first aspect of the present invention,
According to the optical device described above, at the time of assembling the optical device, the optical semiconductor element is inserted into the outer case, and the optical semiconductor element is
By engaging the first positioning convex fixing part provided in the back and said first <br/> positioning fixing recesses provided in the optical semiconductor element back side of the outer case, the light The semiconductor element can be positioned and fixed in the outer case, so that the optical device can be easily assembled without using a conventional adhesive resin or heat deformation means. Optical semiconductor
The insertion distance of the element can be reduced,
The top surface of the outer case is no longer necessary,
The heart can be set high and the size of the optical device can be reduced.
Furthermore, the outer case can have elasticity,
The outer casing of the optical semiconductor device provided with the
Can be easily inserted into the
Deformation can be reduced.

According to the optical device of the second aspect of the present invention, it is possible to use the positioning / fixing concave portion also as an optical path for transmitting light, so that a separate concave portion (slit) for forming an optical path is unnecessary. and Do Rutotomoni, the optical semiconductor element and the outer
Engagement with the mounting case is improved.

Further, according to the optical device of the third aspect of the present invention, the lead terminals for external connection of the optical semiconductor element are lead-free.
External connection by inserting
The fluctuation of the runout of the connection lead terminal is reduced,
It is possible to easily attach the device to the member to be attached.
You.

In addition, according to the optical coupling device of the fourth aspect of the present invention, a conventional adhesive resin or heat deformation means is used.
Optical device can be easily assembled without
In addition, reduction of the insertion distance of the optical semiconductor element and the optical axis of the optical device
High center setting and miniaturization of optical device or external connection
Of the optical device due to the reduction in the fluctuation of the lead terminals
Attachment to the attachment member can be easily performed.

In addition, according to the rotation detecting sensor having the optical coupling device according to the fifth aspect of the present invention, the rotation detecting sensor of the rotation detecting wheel mechanically connected to a tape reel of a video or the like in particular. Becomes effective when used.

In addition, according to the rotation detecting sensor having the optical coupling device according to the sixth aspect of the present invention, even if the height of the optical coupling device is set high, the fluctuation of the lead terminals for external connection is small and automatic. Implementation becomes possible.

[0071]

[Brief description of the drawings]

FIG. 1 is a perspective view for explaining an external structure of an optical coupling device according to an embodiment of the present invention.

FIG. 2 is a longitudinal sectional view for explaining an internal structure of the optical coupling device shown in FIG.

FIG. 3 is an external view when the structure of the optical coupling device shown in FIGS. 1 and 2 is used as a rotation detection sensor of a rotation detection wheel.

FIG. 4 is a longitudinal sectional view showing the structure of a conventional optical coupling device.

5A and 5B are longitudinal sectional views for explaining the structure of another conventional optical coupling device, in which FIG. 5A is a view showing a state (completed product) after fixing of the optical semiconductor element, and FIG. It is a figure showing a state before fixation of an optical semiconductor element.

FIG. 6 is a longitudinal sectional view showing the structure of still another conventional optical coupling device.

FIG. 7 is a perspective view for explaining insertion of the optical semiconductor device of the optical coupling device shown in FIGS. 4 to 6 into an outer case.

FIG. 8 is an external view when a conventional optical coupling device is used as a rotation detection sensor for a rotation detection wheel.

FIG. 9 is a diagram showing a state in which the length of a detected portion of the rotation detection wheel is increased in FIG. 8;

FIG. 10 is a diagram for explaining a problem when the distance of a detected portion of the rotation detection wheel is increased.

[Explanation of symbols]

Reference Signs List 21 light emitting element (optical semiconductor element) 22 light receiving element (optical semiconductor element) 23 outer case 23a positioning fixing recess 24, 26 external connection lead terminal 25, 27 translucent resin 25a, 27a second positioning fixing projection 25b, 27b first positioning convex fixing portions 28 and 29 housing portion (concave element housing) 30, 31 slits (positioning fixing recesses) 32 cutout 33 lead terminal positioning through-holes

──────────────────────────────────────────────────続 き Continuation of the front page (72) Nobumasa Ono 22-22, Nagaikecho, Abeno-ku, Osaka-shi, Osaka Inside Sharp Corporation (56) References JP-A-7-106627 (JP, A) 130458 (JP, U) Japanese Utility Model 2-127047 (JP, U) Japanese Utility Model Utility Model 4-105558 (JP, U) (58) Fields investigated (Int. Cl. ⁷ , DB name) H01L 31/12

Claims (6)

(57) [Claims] 1. An optical semiconductor device comprising: an optical semiconductor device; and an outer case for housing the optical semiconductor device, wherein the outer case includes an element housing recess having an upper opening, and the optical semiconductor device is provided in the device housing recess. In the optical device, a first positioning / fixing projection is provided on the back surface of the optical semiconductor element, and the first positioning / fixing projection is engaged with the optical semiconductor element rear side of the outer case. An optical device comprising: a positioning / fixing concave portion for holding; and a notch provided on two opposing surfaces of the outer case where the fixing concave portion is not provided. 2. A second position corresponding to an optical path of the optical semiconductor device different from the position of the first positioning / fixing projection.
2. The optical device according to claim 1, wherein the positioning and fixing projections are provided, and the outer case is provided with a slit for engaging and holding the second positioning and fixing projections. 3. A lead terminal positioning through-hole which penetrates from a bottom surface of the element accommodating recess to a bottom surface of the exterior case in the exterior case.
An optical device according to claim 1. 4. The optical device according to claim 1, further comprising: a light-emitting element and a light-receiving element formed of the optical semiconductor element, wherein the light-emitting element and the light-receiving element are connected to a passage of an object to be detected. The optical coupling device is provided so as to oppose each other so as to be optically coupled and individually housed in a plurality of element accommodating recesses of the outer case. 5. A rotation detection sensor having an optical coupling device according to claim 4, wherein said object to be detected comprises a rotation detection wheel mechanically connected to a tape reel. 6. The height of the exterior case and the length of a lead terminal for external connection are set to a length that compensates for a distance between the rotation detection wheel and the substrate on which the optical coupling device is mounted. A rotation detecting unit having the optical coupling device according to claim 5.
Sensor .