JPH06177419A - On/off detector by use of optical ic - Google Patents

Abstract

PURPOSE:To provide an ON/OFF detector wherein an optical IC is used which corresponds to effective use of a space by complicated information processing and integration and can indicate the presence or absence of a detected object by using a heat sink mounted on the optical IC. CONSTITUTION:This ON/OFF detector indicates the presence or absence of a detection object using an optical IC which is formed by integrating an optical circuit element on an optical waveguide. It is provided with a light emitting part 1 and a photosensitive part 2, and is constituted of an optical IC 3 wherein complicated logic is incorporated and a heat sink 6 which is formed to a recess with a specified interval 4 and is provided with an optical waveguide 5 in the inside. One end of the optical waveguide 5 of the heat sink 6 is joined to the light emitting part 1 of the optical IC 3, and the other end of the optical waveguide 5 is joined to the photosensitive part 2 of the optical IC 3. The presence or absence of a detection object to the clearance 4 of the heat sink 6 is detected by arrival or cut-off of light of the photosensitive part 2 of the optical IC 3 through the optical wave guide 5 of the heat sink 6 from the light emitting part 1 of the optical IC 3.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is based on optical technology.
Regarding N / OFF detectors, especially when applied to an ON / OFF detector that uses an optical IC that can detect the presence or absence of an object to be detected by a non-contact method by using a heat sink attached to the optical IC. Related technology.

[0002]

2. Description of the Related Art For example, ON / O using optical technology
As the FF detector, there is a photo interrupter 31 in which a light emitting diode and a light receiving transistor are combined, and the outline thereof is as shown in FIG. Used to detect if there is.

The photo interrupter is described, for example, in "Easy LED Story of Optoelectronics", P149-P168, published by Japan Broadcast Publishing Association, May 20, 1989.

[0004]

However, in the prior art as described above, complicated information processing cannot be performed only by the photo interrupter 31. For example, after detecting the presence or absence of an object that blocks light, However, there is a drawback in that a complicated circuit for processing the information in combination with various other information is required separately from the photo interrupter 31.

Further, the output of the photo interrupter 31 causes the load (LO
When the AD) 34 is driven, it is necessary to amplify the output of the photo interrupter 31, so the operation circuit thereof has the configuration shown in FIG. 17, and in this case also, each component is fixed to a predetermined position. However, there is a drawback that it takes time and effort to wire and connect each other.

Further, in the case of the circuit configuration shown in FIG. 17, the values of the electric resistances R0 to R4 must be selected,
To do so, the photo interrupter 31, Tr1, Tr
There is also a drawback that the operating point of 2 must be set with reference to a catalog or handbook.

Here, considering a case where a power source (V) 35 is further connected and a complicated circuit is incorporated in the IC 36, the connection between the IC 36 and the photo interrupter 31 is shown in FIG.
As shown in FIG. 8, the heat dissipation plate 37 of the IC 36 is
It takes only the role of heat dissipation of the IC, and considering that all systems will be integrated in the future, it is necessary to give the heat dissipation plate 37 of the IC 36 another role to effectively use the space. Becomes

In addition, the wiring connecting the IC 36 and the photo interrupter 31 is rusted during long-term use or crosstalk noise with other wiring causes I
There is a risk of causing malfunction of C36 and load 34.

Therefore, the object of the present invention is to cope with the effective use of space by complicated information processing and integration, and the presence or absence of an object to be detected can be detected by using a heat sink attached to the optical IC. It is to provide an ON / OFF detector using an optical IC.

The above and other objects and novel features of the present invention will be apparent from the description of this specification and the accompanying drawings.

[0011]

Among the inventions disclosed in the present application, a brief description will be given to the outline of typical ones.
It is as follows.

That is, ON / OFF using the optical IC of the present invention
The OFF detector uses an optical IC in which optical circuit elements are integrated on the optical waveguide, and is an ON / OFF detector that detects the presence or absence of an object to be detected.
In the detector, the optical IC is provided with a heat radiating plate inside which an optical waveguide is formed with a predetermined gap therebetween. One end of the optical waveguide of the heat radiating plate is coupled to the light emitting portion of the optical IC, and the other end. Light i
It is coupled to the light receiving portion of C.

[0013]

According to the ON / OFF detector using the above-mentioned optical IC, the light-emitting portion and the light-receiving portion of the optical IC are coupled to the optical waveguide of the heat sink mounted on the optical IC with a predetermined gap. Thus, the presence or absence of an object to be detected in the gap of the heat dissipation plate can be detected by the arrival or blocking of the light from the light emitting part of the optical IC to the light receiving part of the optical IC through the optical waveguide of the heat dissipation plate.

Thus, it is possible to perform complicated information processing by detecting the presence or absence of an object to be detected which changes the property of light to the gap of the heat radiating plate and incorporating a complicated logic in the optical IC. Further, even if the logic circuit section and the light emitting section of the optical IC generate heat, the heat can be dissipated and cooled through the heat dissipation plate.

[0015]

Embodiment 1 FIGS. 1 (a) and 1 (b) are a perspective view and a partial sectional view showing an ON / OFF detector using an optical IC according to an embodiment of the present invention, and FIG. ON / OF using IC
FIG. 3 is a block diagram showing the connection between the F detector load and the power supply.
FIG. 4A and FIG. 4B are configuration diagrams when the N / OFF detector is used to measure the rotation speed of the motor.
It is a perspective view and a partial sectional view showing a modification of an N / OFF detector.

First, the construction of an ON / OFF detector using the optical IC of this embodiment will be described with reference to FIG.

The ON / OFF detector of this embodiment uses, for example, an optical IC in which an optical circuit element is integrated on an optical waveguide,
An ON / OFF detector that detects the presence or absence of an object to be detected,
An optical IC 3 including a light emitting portion 1 and a light receiving portion 2, in which a complicated logic is incorporated, and a heat radiating plate 6 which is formed in a concave shape with a predetermined gap 4 and in which an optical waveguide 5 is formed, The heat sink 6 is attached to the optical IC 3.

Then, one end of the optical waveguide 5 of the heat sink 6 is coupled to the light emitting portion 1 of the optical IC 3, and the other end of the optical waveguide 5 is coupled to the light receiving portion 2 of the optical IC 3 to the gap 4 of the heat sink 6. The presence or absence of the object to be detected is detected by the arrival or blocking of light from the light emitting portion 1 of the optical IC 3 to the light receiving portion 2 of the optical IC 3 through the optical waveguide 5 of the heat radiating plate 6.

As shown in FIG. 2, the ON / OFF detector configured as described above has a power source (V) 7 and a load (LOA).
D) 8 is connected to the optical IC 3 to measure the number of rotations of the motor 9 as shown in FIG. 3, that is, the light passing through the cavity 12 of the disk (object to be detected) 11 fixed to the rotation shaft 10 of the motor 9 is detected. It is used when the number of rotations is measured by counting the ON / OFF detectors mounted on the printed circuit board 13.

Next, the operation of this embodiment will be described.

First, the light from the light emitting portion 1 of the optical IC 3 is connected to the light guide plate 5 of the concave shape of the heat dissipation plate 6.
Is input to and output through it. Then, the light output from the optical waveguide 5 is reflected by the concave gap 4 of the heat dissipation plate 6.
Pass through.

Further, the light that has passed through the gap 4 is input to the other concave optical waveguide 5 of the heat dissipation plate 6, and is transmitted and output through the inside thereof. Then, the light output from the optical waveguide 5 is input to the light receiving unit 2 of the optical IC 3.

In this case, for example, when an object to be detected is present in the gap 4 of the heat dissipation plate 6, the object to be detected blocks the light from the light emitting section 1 to the light receiving section 2 of the optical IC 3, The presence of the object to be detected can be detected, and conversely, when the light reaches, it can be determined that the object to be detected does not exist.

If a rotatable disc 11 is provided in the gap 4 of the heat dissipation plate 6 as shown in FIG.
When the cavity 12 of the optical IC 3 is positioned on the optical path of the light, the light reaches the light receiving portion 2 from the light emitting portion 1 of the optical IC 3, while the disc 11
When the cavity 12 of the disk is out of the optical path of the light, the light is emitted from the disk 11
Will not reach the light receiving unit 2 due to the interruption.

As a result, the light is turned on / off by repeatedly reaching and blocking the light from the light emitting portion 1 of the optical IC 3 to the light receiving portion 2.
OFF detection is possible, and the number of rotations of the disk 11 is turned ON.
It can be measured by a / OFF detector.

Furthermore, since the optical IC 3 can be further cooled in addition to the cooling effect of the heat dissipation plate 6 due to the generation of an air flow due to the rotation of the disc 11, the life of the optical IC 3 is shortened and malfunctions and failures are prevented. Is possible.

Therefore, according to the ON / OFF detector of this embodiment, one end of the optical waveguide 5 of the heat dissipation plate 6 mounted on the optical IC 3 is coupled to the light emitting portion 1 of the optical IC 3 and the optical waveguide 5 is connected.
Since the other end of is coupled to the light receiving section 2 of the optical IC 3,
The presence or absence of an object to be detected in the gap 4 of the heat dissipation plate 6 can be detected by the arrival or blocking of light from the light emitting unit 1 to the light receiving unit 2 of the optical IC 3 while achieving the cooling effect of the heat dissipation plate 6.

Further, by using this ON / OFF detector, it is possible to measure the number of revolutions by repeatedly reaching and blocking light, and by incorporating a complicated logic in the optical IC 3, it is possible to perform complicated information processing. Can be

Furthermore, the operation test of the optical IC 3 and the shape inspection of the optical waveguide 5 in the heat dissipation plate 6 can be inspected separately by the optical IC 3 and the heat dissipation plate 6, and when assembling, the optical IC 3 is also tested. This can be easily done by fixing the heat dissipation plate 6.

In the ON / OFF detector of this embodiment, for example, as shown in FIG. 4, the structure of the heat radiating plate 6a is separated into the light emitting portion 1 side and the light receiving portion 2 side of the optical IC 3, and they are coupled to each other. It is also possible to mount it on the optical IC 3.

[0031]

Embodiment 2 FIGS. 5 (a) and 5 (b) are a perspective view and a partial sectional view showing an ON / OFF detector using an optical IC according to another embodiment of the present invention, and FIGS. 7B is a perspective view and a partial cross-sectional view showing a modified example of the ON / OFF detector using the optical IC of the present embodiment.

The ON / OFF detector of this embodiment is an optical IC in which optical circuit elements are integrated on the optical waveguide as in the first embodiment.
Is used as an ON / OFF detector for detecting the presence or absence of an object to be detected, and the heat dissipation plate 6b is attached to the optical IC 3 including the light emitting unit 1 and the light receiving unit 2. The difference from the first embodiment is that the heat dissipation plate is used. 6
The structure of b is different.

That is, the heat radiating plate 6b of this embodiment is shown in FIG.
As shown in FIG.
It has a structure in which the optical waveguide 5 is formed,
It is used when the object to be detected is loaded and unloaded in the left-right direction.

Therefore, according to the ON / OFF detector of this embodiment, since the heat dissipation plate 6b is formed in a U shape,
In particular, the presence or absence of an object to be inserted into and removed from the gap 4 of the heat dissipation plate 6b from the left and right can be detected by the arrival or blocking of light from the light emitting section 1 of the optical IC 3 to the light receiving section 2.

In the ON / OFF detector of this embodiment, the same action can be obtained when the U-shaped light emitting portion 1 side of the heat dissipation plate 6c is cut as shown in FIG. 6, for example. .

[0036]

[Third Embodiment] FIG. 7 is a perspective view showing an ON / OFF detector using an optical IC according to a third embodiment of the present invention.
FIG. 11 is a perspective view showing a modified example of the ON / OFF detector using the optical IC of this embodiment.

The ON / OFF detector of this embodiment uses an optical IC in which an optical circuit element is integrated on the optical waveguide as in the first and second embodiments, and is an ON / OF detector for detecting the presence / absence of an object to be detected.
The light I which is the F detector and includes the light emitting portion 1 and the light receiving portion 2
A heat radiating plate 6d is attached to C3, and the difference from the first and second embodiments is that the structure of the heat radiating plate 6d is different and an optical fiber 14 is used instead of the optical waveguide 5.

That is, the heat dissipation plate 6d of this embodiment is shown in FIG.
And the optical fiber 14 connected to the light emitting portion 1 and the light receiving portion 2 of the optical IC 3 is connected to the opening 15 of the heat dissipation plate 6d, and the light emitting portion 1 to the optical fiber 14 of the optical IC 3 are connected. The presence or absence of an object to be detected in the gap 4 of the heat radiating plate 6d is detected by the arrival or blocking of light passing through the optical IC 3 to the light receiving portion 2 of the optical IC 3.

Therefore, according to the ON / OFF detector of this embodiment, the optical fiber 14 connected to the light emitting section 1 and the light receiving section 2 of the optical IC 3 is connected to the opening 15 of the heat dissipation plate 6d. The presence or absence of an object to be detected in the gap 4 of the heat dissipation plate 6d can be detected by arriving or blocking light from the light emitting section 1 of the optical IC 3 to the light receiving section 2 through the optical fiber 14.

In the ON / OFF detector of this embodiment, for example, the heat radiating plate 6e as shown in FIG. 8 or the structure of the heat radiating plates 6f, 6g as shown in FIG. 9 and FIG. Alternatively, the same effect can be obtained when the optical fiber 14 is connected to one of the light receiving portions 2.

Further, as shown in FIG. 11, it is possible to attach the optical fiber 14 to the heat radiating plate 6h by means of bolts 16 in a detachable manner. In this case, increasing the surface area of the bolts 16 enhances the heat radiating effect. In addition, in order to prevent the bolt 16 from loosening or coming off due to repeated thermal expansion and thermal contraction, it is desirable that the heat dissipation plate 6h and the bolt 16 have the same coefficient of thermal expansion.

[0042]

Fourth Embodiment FIGS. 12 (a) and 12 (b) are a perspective view and a partial cross-sectional view showing an ON / OFF detector using an optical IC according to still another embodiment of the present invention.

The ON / OFF detector of this embodiment uses an optical IC in which an optical circuit element is integrated on an optical waveguide as in the first to third embodiments, and ON / OFF detection for detecting the presence or absence of an object to be detected. And an optical IC 3 including a light emitting section 1 and a light receiving section 2
The heat sink 6i is attached to the
The structure of the heat sink 6i is different, and the optical waveguide 5 and the optical fiber 1 are different.
It is a point that both 4 are used.

That is, the heat dissipation plate 6i of this embodiment is the same as that shown in FIG.
2, the optical fiber 14 is connected to the light emitting section 1 side of the optical IC 3, and the light receiving section 2 of the optical IC 3 is separated.
The optical waveguide 5 is connected to the side, and the presence or absence of an object to be detected in the gap 4 of the separated heat dissipation plate 6i causes the optical fiber 14 and the optical waveguide 5 from the light emitting portion 1 of the optical IC 3 to be detected. The light is detected by passing or passing the light to the light receiving section 2 of the optical IC 3 after passing.

Therefore, according to the ON / OFF detector of this embodiment, since the optical fiber 14 and the optical waveguide 5 are respectively connected to the separated heat radiation plate 6i, the heat radiation plate 6
The presence or absence of an object to be detected in the gap 4 of i, especially the optical fiber 14
And the light receiving section 2 of the optical IC 3 through the optical waveguide 5.
It can be detected by the arrival or blocking of light.

In the ON / OFF detector of this embodiment, the connection between the optical fiber 14 and the optical waveguide 5 is reversed, the optical waveguide 5 is connected to the light emitting section 1, and the optical fiber 14 is connected to the light receiving section 2. It is also possible to connect.

The invention made by the inventor of the present invention has been specifically described based on the first to fourth embodiments, but the present invention is not limited to the above-described embodiments, and various modifications are possible without departing from the scope of the invention. It goes without saying that it can be changed.

For example, the ON / OFF detector of each of the above-mentioned embodiments has been described for the structure shown in FIGS. 1 to 12, but the present invention is not limited to the above-mentioned embodiments. Various modifications such as the following are possible.

(1). The optical waveguide formed on the heat sink is formed separately, or several optical fibers connecting the light emitting portion or the light receiving portion and the opening are bundled and used.

(2). A material that reflects light well is applied around the optical waveguide. In this case, for example, a method of forming an optical waveguide on the heat dissipation plate and then causing a silver mirror reaction in the optical waveguide to apply silver is considered.

(3) In order to prevent erroneous detection due to accumulation of dust and dust in the optical waveguide, the optical waveguide is filled with a transparent material. For example, a transparent material such as glass or plastic is melted and poured into an optical waveguide, and then solidified with no gaps.

(4). For the formation of the optical waveguide on the heat sink, for example, make a groove in a shape as symmetrical as possible for the two heat sinks,
The two are united and formed.

(5). The heat dissipation plate is provided with many folds in order to enhance the heat dissipation effect.

(6). The light emitting portion and the light receiving portion of the optical IC are covered with an opaque material or a heat radiating plate, leaving a desired area.

(7). Instead of the bolts for fixing the optical fiber, an adhesive is used to fix the optical fiber to the heat sink.

(8). The optical IC is provided with a concave portion or a convex portion, and the heat dissipation plate is also formed with a convex portion or a concave portion to be fitted thereto.
And the heat sink are fitted together.

(9). A hook is provided at the end of the heat dissipation plate, and an uneven portion that fits into the hook is formed on the optical IC.

(10). In the case of detecting the rotation of the motor, the disk is provided with notches instead of cavities to detect the number of rotations.

In the above description, the case where the invention made by the present inventor is mainly applied to the ON / OFF detector used for measuring the rotation speed of the motor 9 which is the field of application of the invention has been described, but the invention is not limited to this. However, the present invention can be widely applied to the case of using the keyboard as shown in FIGS. 13 to 15.

That is, in the keyboard 17 of FIG. 13, when the key 18 is pressed or released, the support rod 19 moves up and down, and the vertical movement of the support rod 19 causes the light I to move.
The light from the light emitting portion 1 of C3 to the light receiving portion 2 reaches or is blocked, whereby ON / OFF of the key 18 can be detected.

The keyboard 17a of FIG. 14 uses two optical ICs 3a and 3b. For example, when the light receiving portion 2 of one optical IC 3a fails, the other optical IC 3b in which the key 18 is not pressed is pressed. ON / OFF of the key 18 can be detected by using the light receiving unit 2 of. In this case, which key 18 is used to turn ON / OFF depending on the identification information from the DIP switch 20.
The optical IC 3b is notified.

Further, in the case of the keyboard 17b shown in FIG. 15, the optical IC 3a is built in the key 18 and the optical waveguide 5 is formed in the support rod 19. Then, when the key 18 is pressed, the light from the light emitting portion 1 of the optical IC 3b mounted on the printed board 13 is input to the light receiving portion 2 of the optical IC 3a in the key 18 through the optical waveguide 5 of the support rod 19, Further, light is input from the light emitting portion 1 of the optical IC 3a in the key 18 to the light receiving portion 2 of the optical IC 3b through the optical waveguide 5 of the supporting rod 19.

In this case, the optical IC on the printed circuit board 13
The light from the light emitting portion 1 of 3b and the light I contained in the key 18
The light from the light emitting section 1 of C3a has different frequencies, and the respective light receiving sections 2 detect the difference in the frequencies to prevent erroneous detection of switching of optical communication.

In the keyboards 17, 17a, 17b configured as described above, instead of elastic members such as the springs 21 for returning the keys 18, for example, the supporting rods of the keys and the heat radiating plate are magnets and the repulsive force thereof is used. Or by using one as a magnet and the other as a superconductor, the Meissner effect can be used to eliminate the need for an elastic member.

Further, by incorporating complicated logic in the optical ICs 3, 3a, 3b, the keyboards 17, 17a, 17b can be obtained.
With this, more complicated information processing can be performed, and the keyboards 17, 17a, 17b having multiple functions can be obtained.

[0066]

The effects obtained by the typical ones of the inventions disclosed in the present application will be briefly described as follows.
It is as follows.

That is, the optical IC is separated by a predetermined gap,
A heat dissipation plate having an optical waveguide formed therein is provided, and one end of the light guide of the heat dissipation plate is coupled to a light emitting portion of the optical IC, and the other end is coupled to a light receiving portion of the optical IC, thereby forming a gap between the heat dissipation plates. The presence or absence of an object to be detected can be detected by the arrival or blocking of light from the light emitting portion of the optical IC to the light receiving portion of the optical IC through the optical waveguide of the heat sink. Complex information processing can be performed by detecting and incorporating complex logic in the optical IC.

Moreover, even if the logic circuit section or the light emitting section of the optical IC generates heat, it can be cooled by radiating heat to the outside through the heat radiating plate.

As a result, it is possible to effectively utilize the space by complicated information processing and integration, and it is possible to detect the presence or absence of the object to be detected by the non-contact method particularly by using the heat dissipation plate attached to the optical IC. An ON / OFF detector using an optical IC can be obtained.

[Brief description of drawings]

1A and 1B are a perspective view and a partial cross-sectional view showing an ON / OFF detector using an optical IC that is Embodiment 1 of the present invention.

FIG. 2 is a configuration diagram showing a connection between a load and a power source of an ON / OFF detector using the optical IC of the first embodiment.

FIG. 3 is a configuration diagram when the ON / OFF detector of the first embodiment is used for measuring the rotation speed of a motor.

4 (a) and (b) are ON / O using the optical IC of Example 1. FIG.
It is a perspective view and a partial sectional view showing a modification of an FF detector.

5A and 5B are a perspective view and a partial sectional view showing an ON / OFF detector using an optical IC that is Embodiment 2 of the present invention.

6 (a) and 6 (b) are ON / O using the optical IC of Example 2. FIG.
It is a perspective view and a partial sectional view showing a modification of an FF detector.

FIG. 7 shows ON / OFF using an optical IC that is Embodiment 3 of the present invention.
It is a perspective view which shows an OFF detector.

FIG. 8 is a perspective view showing a modified example of an ON / OFF detector using the optical IC of the third embodiment.

FIG. 9 is a perspective view showing another modification of the ON / OFF detector using the optical IC of the third embodiment.

FIG. 10 is a perspective view showing still another modified example of the ON / OFF detector using the optical IC of the third embodiment.

FIG. 11 is a perspective view showing still another modified example of the ON / OFF detector using the optical IC of the third embodiment.

12A and 12B are a perspective view and a partial cross-sectional view showing an ON / OFF detector using an optical IC that is Embodiment 4 of the present invention.

FIG. 13 is a configuration diagram when an ON / OFF detector using the optical IC of the present invention is applied to a keyboard.

FIG. 14 is a configuration diagram when an ON / OFF detector using the optical IC of the present invention is applied to another keyboard.

FIG. 15 is a configuration diagram when an ON / OFF detector using the optical IC of the present invention is applied to still another keyboard.

FIG. 16 is a perspective view showing a photo interrupter of an ON / OFF detector which is an example of a conventional technique.

FIG. 17 is a circuit diagram showing an operation circuit of a photo interrupter which is an example of a conventional technique.

FIG. 18 is an explanatory diagram showing connection of a photo interrupter, which is an example of a conventional technique, to an IC.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Light emitting part 2 Light receiving part 3,3a, 3b Optical IC 4 Gap 5 Optical waveguide 6,6a-6i Heat sink 7 Power source 8 Load 9 Motor 10 Rotating shaft 11 Disc 12 Cavity 13 Printed circuit board 14 Optical fiber 15 Open hole 16 Volt 17, 17a, 17b Keyboard 18 Key 19 Support bar 20 Dip switch 21 Spring 31 Photo interrupter 32 Light emitting part 33 Light receiving part 34 Load 35 Power supply 36 IC 37 Heat sink

Claims (1)

[Claims] 1. An ON / OFF detector for detecting the presence or absence of an object to be detected using an optical IC in which an optical circuit element is integrated on an optical waveguide, wherein the ON / OFF detector is provided inside the optical IC with a predetermined gap. A heat radiating plate having an optical waveguide formed therein, one end of the optical waveguide of the heat radiating plate is coupled to a light emitting portion of the optical IC, and the other end is coupled to a light receiving portion of the optical IC, and a gap of the heat radiating plate is provided. The presence or absence of the object to be detected in the optical IC is detected by arriving or blocking light from the light emitting portion of the optical IC through the optical waveguide of the heat dissipation plate to the light receiving portion of the optical IC. ON / OFF detector using.