JP2008099150A - Optical signal propagation apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an optical signal propagation apparatus capable of surely operating an electronic device by a remote control operation without being affected by an obstacle or noise. <P>SOLUTION: The optical signal propagation apparatus 3 has an optical propagation path 4 disposed between the electronic device 1 and a remote controller 2 which originates optical control signals P in order to control the electronic device 1, and the optical propagation path 4 is configured to receive the optical control signals P from the remote controller 2 and emit the received optical control signals P to the electronic device 1. The optical signal propagation apparatus further has a light receiving part 5 provided on one end part of the optical propagation path 4 and provided with a light receiving surface 51 for receiving the optical control signals P from the remote controller 2. In the optical propagation path 4, one end is an incidence port 41 where the optical control signals P are made incident, the other end is an emission port 42 where the optical control signals P are emitted, and the incidence port 41 is disposed at the light receiving part 5. The light receiving part 5 is configured such that only the optical control signals P going straight from the remote controller 2 to the incidence port 41 are made incident. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to an optical signal propagation device disposed between an electronic device and a remote control transmitter (hereinafter simply referred to as a remote controller) that transmits an optical control signal to control the electronic device. The electronic device can be reliably operated by remote control operation without being affected by obstacles or noise.

  In recent years, for example, electronic devices such as a television receiver, a video tape recorder, a karaoke apparatus, or an air conditioner have adopted a remote control system that can be remotely operated by a remote controller by omitting or simplifying an operation unit of a front panel. From the remote controller, for example, an FM-modulated control signal is converted into signal light by a light emitting element such as an infrared light emitting diode, and an optical control signal is output. In the remote control receiver of an electronic device, a light control signal composed of infrared rays or the like is received by a remote control receiver having a light receiving element such as a photodiode through a light receiving window provided on the front panel of the electronic device, and is photoelectrically converted into an electrical signal. The electric signal is amplified and demodulated by the reception processing unit and then output to the control unit.

  In general, the remote control method used in this type of electronic device uses light such as infrared rays as a control signal as described above. If there are people or other obstacles between the receiver and the light control signal, the remote control receiver does not reach the remote control receiver reliably, and it may be affected by noise and the desired operation may not be possible. .

Conventionally, for example, an optical fiber cable provided with a fitting type light receiving unit at one end and a fitting type light emitting unit at the other end is provided between the remote control and the light receiving unit of the karaoke apparatus. There is one that is directly coupled (see, for example, Patent Document 1). In addition, an optical fiber cable is embedded in the bathroom wall, etc., and one end of the optical fiber cable is provided with a bowl-shaped concentrator that is mirror-finished. The light control signal from the remote controller is collected by a condenser, received by a light receiving unit, and transmitted to an electronic device via an optical fiber cable (for example, see Patent Document 2). ).
Japanese Patent Laid-Open No. 10-285663 JP 2006-174314 A

  However, in the configuration described in Patent Document 1, since the remote controller and the fitting light emitting unit are directly connected, it is necessary to route the optical fiber cable together with the remote controller according to the user's operation position. In addition to being extremely limited, there were problems such as damage to the optical fiber cable. In the configuration described in Patent Document 2, for example, as shown in the time chart of FIG. 15, the light control unit P reflects the light control signal P directly received by the light receiving unit on the reflecting surface of the collector. Reflected light control signals P2, P3, etc. delayed by time are input as noise. As a result, the light control signal Pn received on the electronic device side via the optical fiber cable is obtained by superimposing a plurality of reflected light control signals P2 and P3 on the light control signal P1. The light control signal Pn on which the noise is superimposed in this way cannot be determined by the signal processing unit of the electronic device, and the remote control operation becomes impossible. In addition, since the optical fiber cable is embedded in the wall and disposed between the light receiving unit and the lens via a space, the positional relationship becomes extremely important, and if these relationships are shifted, the function of transmitting the light control signal In addition to being damaged, the installation work is complicated and extremely expensive. In FIG. 15, the horizontal axis represents time (T).

  The present invention has been made to solve the above-described problems, and an object of the present invention is to provide an optical signal propagation device that can be reliably operated by a remote controller without being affected by an obstacle or noise. To do.

  In order to achieve such an object, the present invention includes an optical propagation path disposed between an electronic device and a remote controller that transmits an optical control signal to control the electronic device, and the optical propagation path is a remote controller. In the optical signal propagation device configured to receive the light control signal from the light source and emit the received light control signal toward the electronic device, the light control signal is provided at one end of the light propagation path and is controlled by the remote controller. A light receiving portion that receives the signal, and an emission portion that is provided at the other end of the light propagation path and emits a light control signal toward the electronic device, and the light propagation path has light control at one end. An incident port through which the signal is incident is formed, and the other end portion is formed as an emission port from which the light control signal is emitted. The light receiving unit is provided with a light receiving surface disposed toward the light control signal, and from the light receiving surface toward the inside. The hemispherical reflecting surface formed to be recessed is made of synthetic resin. It formed in the body, arranging the entrance to the deepest portion of the reflecting surface.

  According to this configuration, the optical propagation path for propagating the optical signal and the one end portion of the optical propagation path are provided between the electronic apparatus and the remote controller that transmits the optical control signal to control the electronic apparatus. The light receiving unit that receives the light control signal from the remote control and the light emitting unit that is provided at the other end of the light propagation path and emits the light control signal toward the electronic device need only be disposed. Unlike the conventional example described above, it is not necessary to directly connect the remote controller and the light propagation path. As a result, the usage pattern is not limited. Further, since it is not necessary to route the light propagation path together with the remote controller according to the operation position of the user, the light propagation path is not damaged. Furthermore, since the entrance is disposed at the deepest part of the hemispherical reflecting surface, only the light control signal directed from the remote control directly to the entrance is incident on the entrance, and the reflected light reflected by the reflecting surface. The control signal is reflected from the light receiving unit to the outside by the reflecting surface. As a result, unlike the conventional example described above, noise is not superimposed on the light control signal, so that the electronic device can be reliably operated by the remote controller without being affected by an obstacle or noise. In addition, unlike the above-described conventional example, no special installation work is required, so that the cost of this type of optical signal propagation device can be reduced.

  In the present invention, an optical propagation path is provided between the electronic device and a remote controller that transmits a light control signal to control the electronic device, and the optical propagation path is controlled by the remote controller. In an optical signal propagation device configured to receive a signal and emit the received optical control signal toward an electronic device, the optical signal propagation device is provided at one end of the optical propagation path and receives the optical control signal from a remote controller A light receiving portion having a surface, and the light propagation path has one end portion as an incident port through which a light control signal is incident, and the other end portion as an emission port from which the light control signal is emitted. The light receiving unit is configured so that only a light control signal directed directly from the remote control to the entrance is incident.

  According to this configuration, unlike the conventional example described above, it is not necessary to directly connect the electronic device and the remote controller via the light propagation path, so that the usage form is not limited. Further, since there is no need to route the light propagation path together with the remote controller, the light propagation path is not damaged. Furthermore, since only the light control signal directed directly from the remote controller to the incident port is incident on the incident port, no noise is superimposed on the light control signal as in the conventional example described above. Therefore, the electronic device can be reliably operated by the remote controller without being affected by an obstacle or noise. In addition, unlike the above-described conventional example, no special installation work is required, so that the cost of this type of optical signal propagation device can be reduced.

  Further, in the present invention, when the light receiving portion is disposed with the light receiving surface facing the remote control receiving portion, a cross-sectional shape having a plurality of surfaces that can serve as installation surfaces is formed in a polygon, and at least two of the surfaces are formed. The surface is configured to have a different angle with respect to the light receiving surface.

  According to this configuration, the light receiving unit has a plurality of surfaces that can serve as installation surfaces, and this surface can be installed so that the light reception surfaces have different angles. It is convenient that the light receiving unit can be installed at an optimum angle with respect to the operator who operates the remote control.

  In the present invention, a holding stand that holds the light propagation path is further provided, and the vicinity of the emission port is held by the holding stand so that the emission port faces the electronic device.

  According to this configuration, since the exit of the light propagation path is held by the holding stand, the positional relationship between the exit and the electronic device can be adjusted very easily with a very simple configuration. convenient.

  Further, the present invention further includes an insertion plug having an emission port disposed therein, and the insertion plug is configured to be detachable from a jack portion of a remote control receiving portion provided in the electronic device.

  According to this configuration, since only the exit port is detachably attached to the jack portion of the remote control receiving portion provided in the electronic device by the plug, the remote control side is free, and its usage form is limited. This is convenient because the light control signal can be reliably transmitted to the electronic device.

  In the present invention, the light receiving part and the light emitting part are formed in the same shape, and the light receiving part can be used as the light emitting part and the light emitting part can be used as the light receiving part.

  According to this configuration, since the light receiving part and the light emitting part are formed in the same shape, the light receiving part and the light emitting part can be installed without being conscious, and it is convenient.

  ADVANTAGE OF THE INVENTION According to this invention, the optical signal propagation apparatus which can operate an electronic device reliably by remote control operation without being influenced by an obstruction and noise can be obtained.

(First embodiment)
Hereinafter, a first embodiment of the present invention will be described with reference to FIGS. 1 is a conceptual diagram showing a configuration of an optical signal propagation device according to a first embodiment of the present invention, FIG. 2 is a schematic sectional view showing an example of a light receiving unit shown in FIG. 1, and FIG. 3 is shown in FIG. It is a front view of a light-receiving part. 4 is a schematic cross-sectional view showing an example of the emission part shown in FIG. 1, and FIG. 5 is a front view of the emission part shown in FIG. FIG. 6 is a schematic perspective view showing another example of the light receiving unit, and FIGS. 7 to 9 are schematic side views showing a state where the light receiving unit shown in FIG.

  As shown in FIG. 1, for example, a television receiver 1, which is an electronic device, includes a display screen including a liquid crystal module. Further, the television receiver 1 is provided with a remote control receiver 12 having a light receiving element such as a photodiode, for example, that receives the light control signal P from the remote controller 2 at a required portion of the front panel 11. The remote controller 2 includes an operation key 21 for performing various operations such as power on / off switching, channel switching, and volume increase / decrease in order to control the television receiver 1. Based on this, for example, a light control signal P such as infrared light is emitted from a light emitting element such as a laser diode. The remote control receiver 12 of the television receiver 1 photoelectrically converts the received light control signal P by the light receiving element and outputs it as an electrical signal to, for example, a signal processor (not shown). Then, the output electric signal is subjected to signal processing such as amplification and demodulation in a signal processing unit and sent to a control means (not shown). The control means performs control corresponding to the input electric signal, for example, power on, Controls off and channel selection.

  With this configuration, the user performs a desired operation such as channel switching, for example, using the remote controller 2 at a location away from the television receiver 1. By this operation, the user can view a desired image displayed on a display screen such as a liquid crystal module of the television receiver 1.

  Thus, according to the present invention, as shown in FIG. 1, the light control signal P from the remote controller 2 is transmitted between the television receiver 1 and the remote controller 2 in order to avoid the influence of obstacles and noise. An optical signal propagation device 3 that receives light and emits the received light control signal P toward the television receiver 1 is provided. The optical signal propagation device 3 includes an optical propagation path 4 for propagating the optical control signal P, a light receiving section 5 provided at one end of the optical propagation path 4 and receiving the optical control signal P from the remote controller 2, The light emitting unit 6 is provided at the other end of the propagation path 4 and emits the light control signal P toward the television receiver 1. The light propagation path 4 functions as an incident port 41 through which one end of the light control signal P enters and the other end serves as an exit port 42 through which the light control signal P exits. As the light propagation path 4, for example, an optical fiber cable, Teggs (a road thread capable of propagating light), or the like can be used. In this case, when the distance is short, the cost can be further reduced by using the teg.

  The light receiving unit 5 is formed so that only the light control signal P directed directly from the remote controller 2 to the incident port 41 is incident. That is, for example, as shown in FIGS. 2 and 3, the light receiving portion 5 is formed so as to be recessed toward the inside from the light receiving surface 51 disposed toward the light control signal P. The hemispherical reflecting surface 52 is formed, and is formed integrally with synthetic resin so that the entrance 41 is located at the deepest part of the reflecting surface 52.

  For example, as shown in FIGS. 4 and 5, the emission unit 6 includes an emission surface 61 and a hemispherical reflection surface 62 formed so as to be recessed from the emission surface 61 toward the inside, as in the light receiving unit 5. And is integrally formed of synthetic resin so that the emission port 42 is located at the deepest portion of the reflection surface 62. In this case, the light receiving unit 5 and the emitting unit 6 may be formed in the same shape, and the light receiving unit 5 may be used as the emitting unit 6 and the emitting unit 6 may be used as the light receiving unit 5. If comprised in this way, since the light-receiving part 5 and the light emission part 6 are formed in the same shape, in particular, the light-receiving part 5 and the light emission part 6 can be installed without being conscious, convenient. Furthermore, standardization of the light receiving unit 5 and the light emitting unit 6 can be achieved, and a molding die can be shared, thereby further reducing costs.

  For example, as shown in FIGS. 6 to 9, the light receiving unit 5 has a triangular pyramid shape whose cross-sectional shape is a polygon, and when the light receiving surface 51 is disposed toward an operator who operates the remote controller 2, It forms so that it may have the some surface 53a, 53b, 53c which may become an installation surface at the time of installing the light-receiving part 5. FIG. And it forms so that each surface 53a, 53b, 53c and the angle with respect to the light-receiving surface 51 may become mutually different angles. That is, in FIG. 7, the surface 53a is the installation surface, the angle with respect to the light receiving surface 51 is θ1, in FIG. 8, the surface 53b is the installation surface, the angle with respect to the light receiving surface 51 is θ2, and the surface 53c is installed in FIG. The angle with respect to the light receiving surface 51 is θ3.

  Thus, the cross-sectional shape having a plurality of surfaces 53a, 53b, and 53c that can serve as installation surfaces as the light receiving unit 5 is formed in a polygonal shape, and at least two of the surfaces 53a, 53b, and 53c are in relation to the light receiving surface 51. If it forms so that an angle may become a mutually different angle, it can install so that the light-receiving surface 51 may become a different angle. Therefore, it is possible to install the light receiving unit 5 so that the light receiving surface 51 is at an optimum angle with respect to an operator who operates the remote controller 2 according to the place of use, installation environment, and the like. Further, although not shown, if the emission portion 6 is formed in the same manner, the same effect can be obtained, which is convenient. Of course, it may be formed in a polygonal shape of a square or more.

  In the present embodiment having the above-described configuration, the light propagation path 4 that propagates the optical signal between the television receiver 1 and the remote controller 2 that transmits the light control signal P to control the television receiver 1. A light receiving unit 5 that is provided at one end of the light propagation path 4 and receives the light control signal P from the remote controller 2, and a light receiving signal 5 that is provided at the other end of the light propagation path 4 and transmits the light control signal P to the television. Since it is only necessary to provide the emitting section 6 that emits toward the receiver 1, it is not necessary to directly connect the remote controller 2 and the light propagation path 4 as in the conventional example described above. As a result, the usage pattern is not limited. Further, since there is no need to route the light propagation path 4 together with the remote controller according to the operation position of the user, the light propagation path 4 is not damaged. Furthermore, since the entrance 41 is disposed at the deepest part of the hemispherical reflecting surface 52, only the light control signal P directed from the remote controller 2 directly to the entrance 41 is incident on the entrance 41, and the reflecting surface. The reflected light control signal reflected by 52 is reflected from the light receiving unit 5 to the outside by the reflecting surface 52. As a result, noise is not superimposed on the light control signal P as in the conventional example described above, and the television receiver 1 can be reliably operated by the remote controller 2 without being affected by obstacles or noise. Can do. In addition, unlike the above-described conventional example, no special installation work is required, so that the cost of this type of optical signal propagation device 3 can be reduced.

(Second Embodiment)
Next, a second embodiment of the present invention will be described with reference to FIGS. FIG. 10 is a conceptual diagram showing a configuration of an optical signal propagation device according to the second embodiment of the present invention, and FIG. 11 is a schematic front view showing an example of a holding stand. 10 and 11, the portions denoted by the same reference numerals as those in FIGS. 1 to 9 described above are substantially the same, and thus detailed description thereof is omitted here. Hereinafter, the difference from the above-described embodiment will be mainly described.

  In this embodiment, as shown in FIG. 10, the exit 42 side of the light propagation path 4 is held by a holding stand 7 as shown in FIG. 11, and the exit 42 is an electronic device. It is arranged so as to face the remote control receiver 12 of the receiver 1. The holding stand 7 includes a base portion 71 installed on an installation table (not shown) on which the television receiver 1 is installed, a leg portion 72, and a holding portion 73 that holds the light propagation path 4, for example, synthetic resin. And so on.

  According to the present embodiment configured as described above, the same operational effects as the above-described embodiment can be obtained, and the exit port 42 of the light propagation path 4 is held by the holding stand 7. And the positional relationship with the television receiver 1 can be adjusted with a very simple configuration, which is convenient.

(Third embodiment)
Next, a third embodiment of the present invention will be described with reference to FIGS. FIG. 12 is a conceptual diagram showing a configuration of an optical signal propagation device according to a third embodiment of the present invention, FIG. 13 is a schematic perspective view showing an example of an insertion plug, and FIG. 14 is a jack of a remote control receiver of an electronic device. It is a sectional side view which shows the state which connected the insertion plug to the part, and partially shows it. In FIGS. 12 to 14, portions denoted by the same reference numerals as those in FIGS. 1 to 11 described above are substantially the same, and thus detailed description thereof is omitted here. Hereinafter, the difference from the above-described embodiment will be mainly described.

  In the present embodiment, as shown in FIGS. 12 to 14, the insertion plug 8 as shown in FIG. 13 is provided on the emission port 42 side of the light propagation path 4, and the emission port 42 is arranged inside the insertion plug 8. It is set. Further, a jack portion 13 to which the plug 8 can be attached and detached is attached to the remote control receiving portion 12 of the television receiver 1 which is an electronic device. For example, as shown in FIG. 13, the insertion plug 8 is formed in a rectangular parallelepiped shape, and the exit 42 of the light propagation path 4 is exposed to the tip 81, and the whole is made of a synthetic resin material or the like. . The insertion plug 8 includes an arm 82 that extends rearward from the vicinity of the upper side of the distal end portion 81. The arm 82 is formed of an elastic portion 83 and a locking portion 84 having a stepped portion 84a. The arm 82 returns to its original state by the repulsive action of the elastic portion 83 even when pushed downward.

  The jack portion 13 mounted on the remote control receiving portion 12 of the television receiver 1 is also formed in a rectangular parallelepiped shape, and a plug insertion portion 14 for inserting the plug 8 is formed on one end face thereof. A locking portion 15 having a step portion 15 a is formed on the upper surface of the inner wall of the plug insertion portion 14. In addition, a light receiving element 16 that receives the light control signal P, a light collecting portion, or the like is provided at a position in contact with the emission port 42 at the tip of the inner wall of the plug insertion portion 14.

  With this configuration, when the plug 8 is inserted into the plug insertion portion 14 of the jack portion 13, the elastic portion 83 of the arm 82 is slidably contacted with the upper surface of the inner wall of the plug insertion portion 14, and the arm 82 is pushed downward. When the insertion plug 8 is inserted to a proper position (see FIG. 14), the arm 82 is displaced upward by the repulsive force of the elastic portion 83, and the engagement portion 84 of the insertion plug 8 and the engagement of the jack portion 13 are engaged. The part 15 is engaged by the step part 84a and the step part 15a. As a result, the plug 8 is prevented from coming out of the jack portion 13 and is securely fixed while being inserted into the jack portion 13. In this state, the light control signal P from the remote controller 2 is transmitted to the remote controller receiver 12 via the light receiver 5 and the light propagation path 4. The light control signal P received by the remote control receiving unit 12 is photoelectrically converted by the light receiving element 16 and output as an electric signal to, for example, a signal processing unit (not shown).

  According to the present embodiment having the above-described configuration, the same operational effects as those of the above-described embodiment can be obtained, and only the outlet 42 is inserted into the jack portion 13 of the remote control receiver 12 provided in the television receiver 1 by the plug 8. Since it is detachably mounted, the remote control 2 side is free, its usage pattern is not limited, and the light control signal P can be reliably transmitted to the television receiver 1. Good.

  Each embodiment described above is a preferred example of the present invention, but the present invention is not limited to this, and various modifications can be made without departing from the scope of the present invention.

  In each of the above-described embodiments, the television receiver has been described in detail, but it is needless to say that the present invention may be applied to various electronic devices such as a video tape recorder, a karaoke device, and an air conditioner.

  Further, in each of the above-described embodiments, the emission port 42 of the light propagation path 4 is supported by the emission unit 6 or the holding stand 7 or embedded in the insertion plug 8. Of course, without using the stand 7 and the insertion plug 8, for example, it may be directly placed on an installation base on which an electronic device is installed and fixed with an adhesive tape or the like.

  Furthermore, according to the present invention, in a demonstration venue where many audiences gather, even if the operator is at a position away from the main body of the electronic device, the operation can be reliably performed by the remote controller, and the demonstration effect can be improved. .

It is a conceptual diagram which shows the structure of the optical signal propagation apparatus which concerns on 1st Embodiment of this invention. It is a schematic sectional drawing which shows an example of the light-receiving part shown in FIG. It is a front view of the light-receiving part shown in FIG. It is a schematic sectional drawing which shows an example of the output part shown in FIG. It is a front view of the output part shown in FIG. It is a schematic perspective view which shows the other example of a light-receiving part. It is a schematic side view which shows the state which used the surface where the light-receiving part shown in FIG. 5 differs as an installation surface. It is a schematic side view which shows the state which used the surface where the light-receiving part shown in FIG. 5 differs as an installation surface. It is a schematic side view which shows the state which used the surface where the light-receiving part shown in FIG. 5 differs as an installation surface. It is a conceptual diagram which shows the structure of the optical signal propagation apparatus which concerns on 2nd Embodiment of this invention. It is a schematic front view which shows an example of a holding stand. It is a conceptual diagram which shows the structure of the optical signal propagation apparatus which concerns on 3rd Embodiment of this invention. It is a schematic perspective view which shows an example of an insertion plug. It is a sectional side view which shows the state which connected the insertion plug to the jack part of the remote control receiving part of an electronic device partially in cross section. It is a time chart of a light control signal for explaining a conventional example.

Explanation of symbols

P Light control signal 1 Electronic equipment (television receiver)
2 Remote control transmitter (remote control)
DESCRIPTION OF SYMBOLS 3 Optical signal propagation apparatus 4 Optical propagation path 41 Incident opening 42 Outgoing opening 5 Incident part 51 Light receiving surface 52 Reflecting surface 6 Outer part 7 Holding stand 8 Plug plug 12 Remote control receiving part 13 Jack part

Claims (6)

An optical propagation path disposed between an electronic device and a remote control transmitter for transmitting an optical control signal to control the electronic device, the optical propagation path from the remote control transmitter; In an optical signal propagation device configured to receive an optical control signal and emit the received optical control signal toward the electronic device,
A light receiving portion provided at one end of the light propagation path for receiving the light control signal from the remote control transmitter; and a light receiving portion provided at the other end of the light propagation path for transmitting the light control signal to the electron And an output part that emits light toward the device, wherein the light propagation path has one end as an entrance through which the light control signal is incident, and the other end through which the light control signal is emitted. The light receiving portion is integrally formed of a synthetic resin with a light receiving surface disposed toward the light control signal and a hemispherical reflecting surface formed so as to be recessed from the light receiving surface toward the inside. The optical signal propagation device is characterized in that the entrance is disposed at the deepest part of the reflecting surface. An optical propagation path disposed between an electronic device and a remote control transmitter for transmitting an optical control signal to control the electronic device, the optical propagation path from the remote control transmitter; In an optical signal propagation device configured to receive an optical control signal and emit the received optical control signal toward the electronic device,
A light receiving portion provided at one end of the light propagation path and having a light receiving surface for receiving the light control signal from the remote control transmitter, wherein the light propagation path has one end disposed on the light propagation path. The incident port for the control signal is incident, the other end is the exit for emitting the light control signal, the incident port is disposed in the light receiving unit, and the light receiving unit is connected to the remote control transmitter. An optical signal propagation device configured to receive only the optical control signal directly directed to the incident port.   When the light receiving portion is disposed with the light receiving surface facing the remote control receiving portion, a cross-sectional shape having a plurality of surfaces that can be an installation surface is formed in a polygon, and at least two of the surfaces are The optical signal propagation device according to claim 1, wherein the optical signal propagation device is configured to have different angles with respect to the light receiving surface.   The holding stand for holding the light propagation path is further provided, and the vicinity of the emission port is held by the holding stand, and the emission port is arranged so as to face the electronic device. 2. The optical signal propagation device according to 2.   3. The plug according to claim 2, further comprising an insertion plug in which the emission port is disposed, wherein the insertion plug is detachable from a jack portion of a remote control receiving unit provided in the electronic device. The optical signal propagation device described.   The light receiving unit and the light emitting unit are formed in the same shape, and the light receiving unit can be used as the light emitting unit, and the light emitting unit can be used as the light receiving unit. The optical signal propagation device described.