JP2003332614A - Optical coupling device and information apparatus using the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To accurately identify the type of a material to be detected with small restriction of the disposing position of the material. <P>SOLUTION: A first optical coupling unit 31 is disposed on the surface side of the material 33 to be detected. A first photodetector 44 photodetects light from a first photodetector 38 reflected by the material 33. A second optical coupling unit 32 is disposed on the rear surface side of the material 33. A second photodetector 57 photodetects light from a second light emitting element 51 reflected on the material 33. Further, the photodetector 44 photodetects the light from the second light emitting element 51 passed through the material 33. In this case, even when the material 33 moves in parallel, the output of the first photodetector 44 by the transmitted light of the material 33 does not almost change. Accordingly, the type of the material 33 can be accurately identified by comparing the transmittance of the material 33 with the reflectivity of the front side and the reflectivity of the rear side. Further, since the first and the second coupling units 31, 32 are separated from each other, the restriction of the material 33 at the disposing position is small. <P>COPYRIGHT: (C)2004,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optical coupling device capable of accurately identifying the type of an object to be detected and an information device using the optical coupling device.

[0002]

2. Description of the Related Art In a printing apparatus such as a printer, printing is performed after changing print settings and conditions according to the type of paper. As a device for automatically identifying the type of paper, an optical coupling device (Japanese Patent Laid-Open No. 11-16
8234). In this optical coupling device,
As shown in FIGS. 3 and 4, one case 1 is provided with a passage 3 through which the object to be detected 2 passes. Further, a light-emitting element chip 4 that irradiates the detection target 2 with light and a reflection light-receiving element chip that receives the light reflected by the detection target 2 in the passage 3 are provided on one side across the passage 3. 5 are provided. On the other hand, on the other side of the passage 3, a light receiving element chip 6 for transmission that receives light transmitted through the object 2 in the passage 3 is provided.

The details will be described below. FIG. 3 is a cross-sectional view of the optical coupling device, and FIG. 4 is an inclined view. In FIG. 3, the light emitting element chip 4 is die-bonded to the lead frame 7 and electrically connected to another lead frame 9 by the gold wire 8. After that, it is molded with a translucent resin (epoxy resin or the like) to form the translucent resin body 10 on the light emitting side. Hereinafter, the light emitting side translucent resin body 10 is referred to as a light emitting element. Then, the light emitting element 10
A lens 11 is provided on the front surface of the so as to collimate or condense the irradiation light to the light receiving side.

The reflection light-receiving element chip 5 is die-bonded to the lead frame 12 and electrically connected to another lead frame 14 by a gold wire 13. After that, the light-receiving side transparent resin body 15 is formed by molding with a transparent resin (epoxy resin or the like). Hereinafter, the light-receiving side translucent resin body 15 is referred to as a reflection light-receiving element. The lens 1 is provided on the front surface of the reflection light receiving element 15.
6 is provided to collect the reflected light from the detected object 2.

Similarly, the transmissive light receiving element chip 6 is
It is die-bonded to the lead frame 17 and electrically connected to another lead frame 19 by a gold wire 18. After that, the light-receiving side transparent resin body 20 is formed by molding with a transparent resin (epoxy resin or the like). Hereinafter, the light-receiving side translucent resin body 20 is referred to as a transmissive light-receiving element. The lens 2 is provided on the front surface of the transmissive light receiving element 20.
1 is provided to collect the transmitted light from the detected object 2.

The light emitting element 10, the reflection light receiving element 15 and the transmission light receiving element 20 are made of a light-shielding resin.
Chambers 23, 25 with windows 22, 24, 26 of one case 1
It is stored in 27. At that time, the chamber 25 is arranged at a position where the reflection light receiving element 15 can receive the light from the light emitting element 10 reflected by the object to be detected 2. Further, the chamber 27 is arranged at a position where the transmissive light receiving element 20 can receive the light from the light emitting element 10 that has passed through the detected object 2. In that case, the optical paths from the light emitting element 10 to the reflection light receiving element 15 and the transmission light receiving element 20 are formed by the windows 22,
As shown by the broken line through 24 and 26. The passage 3 of the case 1 is provided in a concave shape so that the detected object 2 can pass between the optical paths.

[0007]

However, the above-mentioned conventional optical coupling device has the following problems. That is, the light emission amount of the light emitting element chip 4 is adjusted so that the light amount incident on the transmissive light receiving element chip 6 becomes a predetermined amount. Then, the object 2 to be detected is discriminated by the difference in the amount of light received when the adjusted amount of light is reflected by the object 2 to be detected and is incident on the reflection light receiving element chip 5. However, if the distance between the reflection light receiving element 15 and the detected object 2 changes, the amount of incidence on the reflection light receiving element chip 5 changes.

The case where the above is applied to the identification of the type of paper used in the printer will be described as an example. In this case, the types of paper include "glossy paper" having a glossy surface, plain paper and coated paper. Then, the detected values of the amount of light received by reflection and transmission with respect to the paper differ when the distance between the light emitting element 10, the reflection light receiving element 15 and the transmission light receiving element 20 and the paper changes. For this reason, plain paper and coated paper, which have similar sheet reflectances, may not be identified when the distance changes.

The amount of light received when the light is transmitted through the object 2 to be detected and is incident on the transmissive light receiving element chip 6, and the object 2 to be detected.
In some cases, the object 2 to be detected may be identified based on the difference in the ratio of the amount of light received when the light is reflected by the light-receiving element chip 5 for reflection. Some glossy papers have different reflectances on the front surface and the back surface, such as those in which only the front surface of the paper is glossy and those in which both surfaces of the paper are glossy. In that case, as described above, it is difficult to identify the type of paper only by comparing the ratio of the amount of reflected light and the amount of transmitted light of the paper.

Further, as shown in FIGS. 3 and 4, the optical coupling device is mounted in one case 1 by sharing the light emitting element of one reflection type optical coupling device and one transmission type optical coupling device. It has been configured. Therefore, the arrangement position for the sheet as the object to be detected is limited to the edge portion, and the sheet cannot be arranged at the central portion of the sheet. further,
There is also a problem that the amount of reflected light on the front surface of the paper and the amount of reflected light on the back surface cannot be measured.

Therefore, the object of the present invention is to place less restrictions on the arrangement position with respect to the object to be detected, and to utilize the difference in the front reflectance, back reflectance and transmittance of the object to be detected with high accuracy. An object is to provide an identifiable optical coupling device and an information device using the optical coupling device.

[0012]

In order to achieve the above object, an optical coupling device according to a first aspect of the invention comprises a first light emitting element and a first light receiving element which are arranged on one side of an object to be detected.
An optical coupling body and a second optical coupling body having a second light emitting element and a second light receiving element arranged on the other side of the detected object are provided. An output signal from the first light receiving element based on light emitted from the first light emitting element and reflected by the object to be detected, as a signal for identifying the presence and type of the object to be detected, Based on the output signal from the second light receiving element based on the light emitted from the first light emitting element and transmitted through the object to be detected, and the light emitted from the second light emitting element and reflected by the object to be detected. An output signal from the second light receiving element is obtained.

When the object to be detected is a sheet, there is almost no change in the amount of transmission of the sheet even if the passing position of the sheet shifts to either one of the first and second optical coupling bodies. Therefore, by using the reflected light amount of the front side and the reflected light amount and the transmitted light amount of the back side of the paper based on each output signal,
The types of plain paper, glossy paper, coated paper and the like can be easily and accurately identified. Also,
Some of the above papers have different reflectances on the front and back sides, such as glossy paper with gloss on one side or both sides, but even in that case, only one side has gloss based on the amount of reflected light on both sides. Whether the glossy paper is glossy or glossy with both sides glossy is accurately identified.

Further, the present optical coupling device is arranged on the other side of the object to be detected independently of the first optical coupling body arranged on one side of the object to be detected and the first optical coupling body. It is composed of a second optical coupler. Therefore, there are few restrictions on the arrangement position for the object to be detected, and the object can be arranged at the central portion of the sheet.

Further, in the optical coupling device of one embodiment, the output signal from the first light receiving element based on the light emitted from the first light emitting element and reflected by the object to be detected, and the first signal
The output signal from the second light receiving element based on the light emitted from the light emitting element and transmitted through the object to be detected, and the second signal based on the light emitted from the second light emitting element and reflected by the object to be detected. An identification unit is provided for identifying the presence or absence and the type of the detected object based on the output signal from the light receiving element. In this way, the presence / absence and type of the object to be detected are automatically identified.

In the optical coupling device according to the first embodiment, the first light emitting element and the second light emitting element emit light at different times. In this way, adverse effects due to the interference between the light emitted from the first light emitting element and the light emitted from the second light emitting element are prevented.

Further, in the optical coupling device of one embodiment, the first optical coupling body and the second optical coupling body are arranged at positions where the light from the first light emitting element directly enters the second light receiving element. ing. Thus, based on the light from the first light emitting element, the detection of the amount of light reflected by the object to be detected by the first light receiving element and the detection of the amount of transmitted light of the object to be detected by the second light receiving element are performed simultaneously. Be seen.

Further, in the optical coupling device of the first embodiment, the first light emitting element and the second light emitting element are provided with lenses for collimating or condensing emitted light. Therefore, specular reflection light from the object to be detected easily enters the first light receiving element and the second light receiving element, and diffusely reflected light from the object to be detected hardly enters.

Further, in the optical coupling device of the first embodiment, a condenser lens is provided on the first light receiving element and the second light receiving element. Therefore, the light receiving sensitivities of the first light receiving element and the second light receiving element are enhanced.

Further, in the optical coupling device according to the first embodiment, the optical system including the lens is provided with the specularly reflected light from the object to be detected to the first light receiving element and the second light receiving element. The diffused reflection light from the object to be detected is adjusted so as to be difficult to enter. Therefore, the identification performance of the detected object is further improved.

Further, in the optical coupling device of one embodiment, the optical systems of the first optical coupling body and the second optical coupling body are equivalent (substantially the same) optical systems, and are reflected by the object to be detected. Further, the optical characteristics of the light from the first light emitting element and the light from the second light emitting element are equal (substantially the same). Further, in the optical coupling device according to the first embodiment, the incident angles of the light from the first light emitting element and the light from the second light emitting element with respect to the object to be detected are equal, and the light from the first light emitting element is equal to the incident angle. Second above
The angle of reflection of the light from the light emitting element by the object to be detected is equal.

Therefore, instead of the amount of light emitted from the first light emitting element and transmitted through the object to be detected by the second light receiving element, the light emitted from the second light emitting element is transmitted through the object to be detected. By using the amount of the received light received by the first light receiving element, it is possible to identify the presence or absence and the type of the detected object.

The information equipment of the second invention is the above first equipment.
The optical coupling device according to the invention is mounted. Therefore, when the object to be detected is paper, the type of paper is accurately identified whether it is plain paper, glossy paper, or coated paper, and the setting conditions such as printing conditions are accurately and automatically determined according to the identification result. Is changed to.

[0024]

BEST MODE FOR CARRYING OUT THE INVENTION The present invention will be described in detail below with reference to the embodiments shown in the drawings. FIG. 1 is a cross-sectional view of the optical coupling device according to the present embodiment. 2 is an external perspective view of the optical coupling device shown in FIG. In this optical coupling device, a reflection type optical coupling device is arranged on the front surface and the back surface of an object to be detected.

In FIGS. 1 and 2, the first optical coupling device 31 as the first optical coupling body is one of the objects 33 to be detected.
While being arranged on the (front) side, the second optical coupling device 32 as the second optical coupling body is arranged on the other (back) side of the detected object 33. Then, the first and second optical coupling devices 31 and 32 are
Each has a light emitting element chip and a light receiving element chip, and is configured as follows.

That is, the first of the first optical coupling device 31
The light emitting element (infrared light emitting diode) chip 34 is die-bonded to a lead frame 35 and electrically connected to another lead frame 37 by a gold wire 36. Then, the light emitting side translucent resin body 38 is formed by molding with a translucent resin such as an epoxy resin. Hereinafter, the light emitting side translucent resin body 38 is referred to as a first light emitting element. A lens 39 is provided on the front surface of the first light emitting element 38 to collimate or condense the irradiation light to the light receiving side.

Similarly, the first light receiving element (photodiode)
The chip 40 is die-bonded to the lead frame 41,
It is electrically connected to another lead frame 43 by a gold wire 42. Then, the light-receiving side transparent resin body 44 is formed by molding with a transparent resin such as an epoxy resin. Hereinafter, the light-receiving side translucent resin body 44 is referred to as a first light-receiving element. A lens 45 is provided on the front surface of the first light receiving element 44 to collect the irradiation light from the first light emitting element 38.

Further, the first light emitting element 38 and the first light receiving element 44 are housed in one light-shielding resin (case) 46 to form the first optical coupling device 31. At that time,
The first light receiving element 44 is housed at a position where the light from the first light emitting element 38 reflected by the detected object 33 can be received. Further, the first light emitting element 38 in the case 46
Lens 39 in front of and the lens 45 of the first light receiving element 44
A slit is formed on the front side to secure an optical path from the first light emitting element chip 34 to the first light receiving element chip 40.

The second light emitting element (infrared light emitting diode) chip 47 of the second optical coupling device 32 is die-bonded to a lead frame 48 and electrically connected to another lead frame 50 by a gold wire 49. . Then, the light emitting side translucent resin body 51 is formed by molding with a translucent resin such as an epoxy resin. Hereinafter, the light emitting side translucent resin body 51 is referred to as a second light emitting element. A lens 52 is provided on the front surface of the second light emitting element 51 to collimate or condense the irradiation light to the light receiving element side.

Similarly, the second light receiving element (photodiode)
The chip 53 is die-bonded to the lead frame 54,
It is electrically connected to another lead frame 56 by a gold wire 55. Then, the light-receiving side transparent resin body 57 is formed by molding with a transparent resin such as an epoxy resin. Hereinafter, the light-receiving side translucent resin body 57 is referred to as a second light-receiving element. A lens 58 is provided on the front surface of the second light receiving element 57 so as to collect the irradiation light from the second light emitting element 51.

Further, the second light emitting element 51 and the second light receiving element 57 are housed in one light shielding resin (case) 59 to form the second optical coupling device 32. At that time,
The second light receiving element 57 is housed at a position where the light from the second light emitting element 51 reflected by the object 33 to be detected can be received. Further, the second light emitting element 51 in the case 59
Front lens 52 and lens 58 of second light receiving element 57
A slit is formed in the front, and an optical path from the second light emitting element chip 47 to the second light receiving element chip 53 is secured.

Further, each of the lenses 39, 45, 52, 58 described above
The shape is formed such that the light is collimated or condensed so that the specularly reflected light from the detection object 33 is likely to be incident and the diffusely reflected light is difficult to be incident. Further, the optical system including the lenses 39, 45, 52, 58 is also adjusted so that specular reflection light from the detection object 33 is likely to be incident and diffuse reflection light is difficult to be incident. Further, the first light receiving element 44 is arranged at a position where the light from the second light emitting element chip 47 of the second light emitting element 51 directly enters when there is no detected object 33. The optical systems of the first optical coupling device 31 arranged on the front surface side of the object to be detected 33 and the second optical coupling device 32 arranged on the rear surface side are configured to be the same (substantially the same). Further, they are arranged symmetrically with respect to the detected object 33. Therefore, the first light reflected by the detected object 33
The optical characteristics of the light from the light emitting element 38 and the light from the second light emitting element 51 are the same characteristics (substantially the same characteristics).

The optical coupling device having the above structure operates as follows. As described above, the object to be detected has a difference in reflectance and transmittance, and the difference allows the type of the object to be detected to be identified. However, the detected object is
When the reflectance is close like plain paper, glossy paper, and coated paper used in printers, etc., the amount of light received by reflection changes when the distance between the object to be detected and the optical coupling device changes, and the relationship with the transmittance It is difficult to identify the type because there is a difference in

Here, like the optical coupling device in the present embodiment, if the optical coupling devices 31 and 32 exist on the front surface side and the back surface side of the object 33 to be detected, the first optical coupling device 31 and the object to be detected 31 will be detected. Even if the distance between the object 33 and the distance between the second optical coupling device 32 and the object 33 to be detected changes, the identification can be performed.

For example, the first optical coupling device 31 on the front surface side of the detected object 33 and the second optical coupling device 31 on the back surface side of the detected object 33.
In the optical coupling device 32, the first and second light emitting elements 38, 5
1 and object 3 to be detected by the first and second light receiving elements 44 and 57
When the sensitivity to the reflected light from 3 is adjusted to be the same, the distance between the detected object 33 and the first optical coupling device 31 and the distance between the detected object 33 and the second optical coupling device 32 are the same. Then, the outputs of the first and second light receiving elements 44 and 57 in the first and second optical coupling devices 31 and 32 are the same.

In this state, when the passing position of the detected object 33 approaches the first optical coupling device 31 on the front surface side, the distance from the second optical coupling device 32 on the rear surface side increases,
A difference occurs in the outputs of the first and second light receiving elements 44 and 57 with respect to the light reflected by the detected object 33. here,
The transmittance of the detected object 33 does not change greatly even when the position where the detected object 33 passes is close to any of the first and second optical coupling devices 31 and 32. Therefore, the light from the second light emitting element 51 on the back surface side of the detected object 33 is not detected.
There is almost no change in the output of the first light receiving element 44 when the light passes through the first light coupling device 31 on the front surface side and enters the first light coupling device 31.

Therefore, in the present embodiment, based on the transmitted light amount of the object to be detected 33 as a reference, based on the ratio of the reflected light amount on the front side to the transmitted light amount and the ratio of the reflected light amount on the back side to the transmitted light amount, The type of the detected object 33 is identified. That is, the arithmetic processing means such as a microcomputer calculates the ratio of the output value of the first light receiving element 44 due to the reflection of the detected object 33 to the output value of the first light receiving element 44 due to the transmission of the detected object 33. Further, the second light receiving element 57 is formed by the reflection of the detected object 33 with respect to the output value of the first light receiving element 44 by the transmission of the detected object 33.
Calculate the ratio of the output values of. On the other hand, a table in which the type of the detected object 33 and the value of the above two ratios are obtained in advance with respect to various passage positions of the detected object 33 is prepared in the memory means. Then, the arithmetic processing means can identify the type of the detected object 33 by drawing the table based on the calculated values of the two ratios. That is, in the present embodiment, the identification means is
It is composed of the arithmetic processing means (microcomputer) and the memory means.

In this case, as in the conventional optical coupling device described above, when the type of the sheet is identified only by the value of the ratio of the reflected light amount on one side and the transmitted light amount of the sheet as the object to be detected, the position of the sheet is determined. Even if it changes or the type of paper changes, the value of the ratio changes similarly. Therefore, the type of paper cannot be easily identified. However, in the case of the optical coupling device according to the present embodiment, when the position of the sheet is changed and when the type of the sheet is changed, the value of the ratio of the amount of front-surface reflected light and the amount of transmitted light, the amount of back-surface reflected light, and the amount of transmitted light are transmitted. The pattern of change with the value of the ratio to the light amount is different. Therefore, it is possible to easily identify the type of paper by checking the pattern in advance.

In this case, by shifting the timing of the light emission time of the first light emitting element chip 34 in the first optical coupling device 31 and the light emission time of the second light emitting element chip 47 in the second optical coupling device 32, It is possible to prevent light from the first light emitting element 38 and light from the second light emitting element 51 from interfering with each other and causing no adverse effect.

The optical coupling device in the present embodiment is the first optical coupling device 3 located on the surface side of the object 33 to be detected.
1 and a second optical coupling device 32 which is separated from the first optical coupling device 31 and is located on the back surface side of the detected object 33. Therefore, there are few restrictions on the arrangement position on the detection object 33, and the detection object 33 can be arranged at the central portion of the paper.

Further, each of the lenses 39, 45, 52, 5 described above
The shape of 8 is formed to collimate or condense light so that specularly reflected light from the object to be detected 33 is likely to be incident and diffusely reflected light is less likely to be incident. The optical system including the lenses 39, 45, 52, 58 is also adjusted so that specular reflection light from the detection object 33 is likely to enter and diffuse reflection light is difficult to enter. Therefore, the influence of irregularly reflected light from the detected object 33 can be eliminated, and the identification performance of the detected object 33 can be further improved.

As described above, in the present embodiment, the optical system of the first optical coupling device 31 located on the front surface side of the detected object 33 and the second optical coupling device 3 located on the rear surface side thereof.
The second optical system has the same configuration and is arranged symmetrically with respect to the detected object 33. The first light receiving element 44 of the first optical coupling device 31 includes the second optical coupling device 3
The light from the second second light emitting element 51 is directly incident. This means that the light is directly incident on the second light receiving element 57 of the second optical coupling device 32 from the first light emitting element 38 of the first optical coupling device 31 without any correction. is doing. Therefore, the first light emitting element 38 is used as the amount of transmitted light with respect to the reference object 33 to be detected.
It is possible to use the output of the second light receiving element 57 based on the light that is emitted from and transmitted through the detected object 33.

As described above, the optical coupling device according to the above-described embodiment can accurately identify the types of paper having similar reflectances such as plain paper, glossy paper, and coated paper. Therefore, by using the above-mentioned paper and using it in an information device such as a printer, a copier, or a facsimile that changes the printing condition according to the kind of the paper and performs printing, the printing condition can be more accurately determined according to the kind of the paper. Can be automatically set to, and operability can be greatly improved.

[0044]

As is apparent from the above, the optical coupling device of the first invention is a first optical coupling body having a first light emitting element and a first light receiving element and arranged on one side of an object to be detected. And the second
Since the second photocoupler has a light emitting element and a second light receiving element and is arranged on the other side of the object to be detected, the object to be detected from the first light emitting element to the first light receiving element. An output signal from the first light receiving element due to reflected light from the second light receiving element, and an output signal from the second light receiving element due to transmitted light from the object to be detected from the first light emitting element to the second light receiving element;
Based on the output signal from the second light receiving element due to the reflected light from the light emitting element to the second light receiving element on the object to be detected,
By identifying the presence or absence and the type of the detected object, the presence or absence of the detected object can be detected regardless of the displacement of the detected object to one of the first and second optical coupling bodies. It is possible to accurately identify the type.

That is, according to the present invention, when the object to be detected is a sheet, even if the passage position of the sheet is shifted to one of the first and second optical coupling bodies, Using the amount of reflected light on the front side and the amount of reflected light and transmitted light on the back side of the paper based on the output signal, the plain paper of the paper,
The types of glossy paper and coated paper can be easily and accurately identified. Further, it is possible to accurately distinguish between glossy paper having gloss on only one side and glossy paper having gloss on both sides based on the reflected light amounts on both sides.

Further, the present optical coupling device is arranged on the other side of the object to be detected independently of the first optical coupling body arranged on one side of the object to be detected and the first optical coupling body. It is composed of a second optical coupler. Therefore, there are few restrictions on the arrangement position with respect to the object to be detected, and the object can be arranged in the central portion of the sheet as the object to be detected.

The information equipment of the second invention is the above-mentioned first equipment.
Since the optical coupling device of the present invention is mounted, when the detected object is a paper, the type of the paper is accurately identified, and the setting conditions such as the printing conditions are accurately and automatically determined according to the identification result. Can be changed.

[Brief description of drawings]

FIG. 1 is a cross-sectional view of an optical coupling device of the present invention.

FIG. 2 is an external perspective view of the optical coupling device shown in FIG.

FIG. 3 is a cross-sectional view of a conventional optical coupling device.

4 is an external perspective view of the conventional optical coupling device shown in FIG.

[Explanation of symbols]

31 ... First optical coupling device, 32 ... A second optical coupling device, 33 ... Object to be detected, 34 ... First light emitting element chip, 38 ... 1st light emitting element, 39,45,52,58 ... Lens, 40 ... First light receiving element chip, 44 ... First light receiving element, 46, 59 ... Case, 47 ... Second light emitting element chip, 51 ... Second light emitting element, 53 ... Second light-receiving element chip, 57 ... 2nd light receiving element.

Claims (10)

[Claims] 1. A first light emitting element, which is disposed on one side of a detected object and emits light to the detected object, and receives light from the first light emitting element reflected by the detected object. A first photocoupler having a first light receiving element; a second light emitting element which is arranged on the other side opposite to the one side of the object to be detected and emits light to the object to be detected; A second photocoupler having a second light receiving element for receiving the light from the second light emitting element reflected by the detected object and the light from the first light emitting element transmitted through the detected object; An output signal from the first light receiving element based on light emitted from the first light emitting element and reflected by the object to be detected is used as a signal for identifying the presence and type of the object to be detected, and the first signal. Based on the light emitted from the light emitting element and transmitted through the detected object An optical coupling characterized in that an output signal from the second light receiving element and an output signal from the second light receiving element based on the light emitted from the second light emitting element and reflected by the object to be detected are obtained. apparatus. 2. The optical coupling device according to claim 1, wherein an output signal from the first light receiving element based on light emitted from the first light emitting element and reflected by the object to be detected; The output signal from the second light receiving element based on the light emitted from the light emitting element and transmitted through the object to be detected, and the second signal based on the light emitted from the second light emitting element and reflected by the object to be detected. An optical coupling device comprising identification means for identifying the presence or absence and the type of the object to be detected based on the output signal from the light receiving element. 3. The optical coupling device according to claim 1, wherein the first light emitting element and the second light emitting element emit light at different times. 4. The optical coupling device according to claim 1, wherein in the first optical coupling body and the second optical coupling body, the light from the first light emitting element is the light when the object to be detected is absent. An optical coupling device, wherein the optical coupling device is arranged at a position where it directly enters the second light receiving element. 5. The optical coupling device according to claim 1, wherein the light emitting position of the first light emitting element in the first optical coupling body and the light emitting position of the second light emitting element in the second optical coupling body are output. An optical coupling device comprising a lens for collimating or condensing emitted light. 6. The optical coupling device according to claim 1, wherein light is condensed at a light incident position of a first light receiving element in the first optical coupling body and a light incident position of a second light receiving element in the second optical coupling body. An optical coupling device comprising a lens. 7. The optical coupling device according to claim 5, wherein in the optical system including the lens, specular reflection light from the object to be detected is incident on the first light receiving element and the second light receiving element. An optical coupling device, characterized in that it is adjusted so that it is easy and that diffused reflection light from the object to be detected is less likely to enter. 8. The optical coupling device according to claim 7, wherein the optical system in the first optical coupling body and the optical system in the second optical coupling body are equivalent optical systems, and the detected object is detected. An optical coupling device characterized in that the optical characteristics of the light from the first light emitting element reflected by an object and the optical characteristics of the light from the second light emitting element are equivalent. 9. The optical coupling device according to claim 8, wherein the incident angle of the light from the first light emitting element to the object to be detected and the light from the second light emitting element to the object to be detected. The incident angle is equal, and the reflection angle of the light from the first light emitting element by the detected object is equal to the reflection angle of the light from the second light emitting element by the detected object. Optical coupling device. 10. An information device equipped with the optical coupling device according to claim 1. Description: