JP4645326B2 - Light emitting / receiving device and transmitting / receiving device - Google Patents

Description

  The present invention relates to a light emitting / receiving device for a transmitting / receiving device that performs data transmission by transmitting and receiving an optical signal modulated by a data signal, and a transmitting / receiving device configured to include such a light receiving / emitting device.

  In recent years, an optical signal transmission technique using light has been proposed as an information signal transmission means. As such an optical signal transmission technique, for example, a so-called “optical wireless LAN” for performing communication between a plurality of computers, a technique for transmitting video information and audio information to an AV (Audio-Visual) device, and the like have been proposed. Yes. Such optical signal transmission is performed by transmitting and receiving an optical signal (light beam) modulated in accordance with a data signal (digital information) between a transmitting and receiving device configured to include a light receiving and emitting device.

  In such a light emitting / receiving device of a transmitting / receiving device, an LD (laser diode) or an LED (light emitting diode) is used as a light emitting element on the transmission side for transmitting an optical signal.

  When an LED is used as the light emitting element, the light beam from the LED has a wide directivity, and this light beam must be collected by a focusing lens or a parapolar reflector. This is because when the beam diameter is widened, the received power is reduced, and there is a problem that interference occurs when a plurality of devices are used in parallel. When the light beam from the light emitting element is condensed by a focusing lens or a parapolar reflector, it is necessary to match the optical axes of the transmission side device and the reception side device.

  For example, in the transmission / reception device described in Patent Document 1, as shown in FIG. 13, a light-emitting element for pilot light is provided in the transmission / reception device serving as a master unit separately from the light-emitting element for transmitting a data signal. The pilot light for adjusting the optical axis is transmitted from the light emitting element. The transmission / reception device serving as the slave unit is configured to shift the reception direction so that pilot light is received by the light receiving element, and to adjust the optical axis based on the light reception level of the pilot light. The transmission / reception device serving as a slave unit is configured to be rotated by a stepping motor or the like to displace the reception direction. This transmission / reception apparatus is configured to scan the reception direction in the horizontal and vertical directions and search for a direction in which the light reception level of the pilot light is maximum.

  However, since there is a limit to condensing the luminous flux emitted from the LED by a focusing lens or the like, in an apparatus using an LED as a light emitting element, the beam diameter is widened when an optical signal is transmitted over a long distance. The received power will decrease.

  On the other hand, when an LD is used as the light emitting element, the directivity of the emitted light beam can be made narrower, and an optical signal can be transmitted over a long distance as when used outdoors. Further, by using an LD as a light emitting element, it is possible to realize a high speed response superior to that in the case of using an LED. That is, when an LED is used as a light emitting element, transmission at 100 Mbps to 200 Mbps is a limit, whereas when an LD is used as a light emitting element, the maximum transmission speed is about 10 Gbps, which is equivalent to the transmission speed of an optical fiber or the like. Gigabit-class high-speed transmission is possible.

  However, in this case, it is necessary to transmit a narrow-directional light beam more accurately toward the light receiving unit of the apparatus that is the communication partner.

  Therefore, as described in Patent Document 2, a transmission / reception apparatus is proposed that performs optical axis adjustment between a transmission-side apparatus and a reception-side apparatus using a deflection mirror. This deflecting mirror is configured to perform a highly accurate and high-speed deflecting operation by an electromagnetic drive mechanism.

Japanese Patent No. 3059870 Japanese Patent No. 3206993

  By the way, in the transmission / reception apparatus as described above, since the optical axis adjustment is performed by rotating the whole transmission / reception apparatus as a slave unit by a stepping motor or the like, the apparatus configuration becomes large. In particular, as a transmission / reception device used indoors, downsizing of the device configuration is required.

  In order to increase the speed of signal transmission, it is necessary to transmit and receive optical signals with high efficiency, and it is necessary to narrow the transmitted and received optical signals to a light beam with a narrower directivity angle. Then, it is necessary to adjust the optical axis between the transmission side device and the reception side device with higher accuracy. However, in the optical axis adjustment by rotating the entire transmission / reception apparatus as described above, it is difficult to achieve high accuracy and high response speed.

  As described above, a transmission / reception apparatus that performs optical axis adjustment using a deflection mirror has a complicated configuration using a large number of optical elements, and the configuration of the apparatus also increases in size. In addition, since the deflection mirror can be deflected at a narrow angle of about several degrees, it is suitable for fine adjustment after a certain amount of optical axis adjustment has been completed. Not suitable for searching. Therefore, this transmission / reception apparatus is not suitable as an apparatus used while moving.

  Therefore, the present invention is proposed in view of the above-described circumstances, and transmits an optical signal modulated based on a data signal and receives and demodulates an optical signal modulated based on the data signal. The light emitting / receiving device used in the transmission / reception device that performs data transmission by high-accuracy adjustment of the optical axis between the transmission / reception device and other transmission / reception devices while allowing the transmission / reception device to be downsized and easy to manufacture. An object of the present invention is to provide a light emitting / receiving device that can be performed at high speed.

  Further, according to the present invention, by using such a light receiving and emitting device, downsizing and facilitation of manufacture can be achieved, and optical axis adjustment with other transmitting / receiving devices can be performed with high accuracy and at high speed. It is an object to provide a transmission / reception device.

  In order to solve the above-described problems, a light receiving and emitting device according to the present invention has any one of the following configurations.

[Configuration 1]
A movable reflective optical system that reflects and deflects the incident light beam, a condensing optical system that converges the light beam deflected by the movable reflective optical system, and a light beam that is converged by the condensing optical system are incident. A first semi-transmissive surface that reflects part of the light and reflects the remaining part; a second semi-transmissive surface that reflects part of the light beam reflected by the first semi-transmissive surface and transmits the remaining part; and a transparent substrate. Formed by applying a sphere or a diffusing material added with a dye having a different refractive index, or formed by sandblasting or hologram processing the surface of a transparent substrate, and reflected by the second translucent surface A diffusion optical system for diffusing a light beam, a multi-divided light receiving element having a light receiving surface having a plurality of light receiving portions at a focal position of the light collecting optical system, and receiving a light beam diffused by the diffusion optical system by the plurality of light receiving portions; Transmit through the second translucent surface A light-receiving element that receives the reflected light beam, a light-emitting element that emits a light beam modulated by a data signal and sends the light beam through a condensing optical system, and at least one that fixes the multi-divided light-receiving element, the light-receiving element, and the light-emitting element. The optical axis of the emitted light beam emitted from the light emitting element and sent out through the condensing optical system and the condensing optics are made equal to each other by the same level of the output signal corresponding to each light receiving part of the multi-divided light receiving element. And a deflection control unit that controls the movable reflective optical system so that the optical axis of the incident light beam that enters the system and reaches the light receiving element reaches the light receiving element.

[Configuration 2]
In the light receiving and emitting device having the configuration 1, the multi-divided light receiving element, the light receiving element, and the light emitting element are mounted on the substrate on the light receiving surface side or the light beam emitting side. The incident light flux that has passed through or through the through-hole provided in the substrate is received, and the light-emitting element transmits the emitted light flux through the substrate or through the through-hole provided in the substrate. It is what.

[Configuration 3]
In the light receiving and emitting device having the configuration 1 or the configuration 2, a wavelength selection filter is disposed on at least an optical path of an incident light beam incident on the light receiving element, and the wavelength selection filter is a predetermined one of the incident light beams. Only the light flux in the wavelength region is transmitted.

[Configuration 4]
In the light receiving and emitting device having any one of the configurations 1 to 3, at least one of a driving unit that drives the light emitting element and an amplifying unit that amplifies the electric signal output from the light receiving element is provided on the substrate. It is characterized by this.

  The transmission / reception apparatus according to the present invention has the following configuration.

[Configuration 5]
The level of the electric signal output from each light receiving part of the multi-divided light receiving device while converting the electric signal output from the light receiving / emitting device having any one of the structures 1 to 4 and the light receiving element into a digital signal and sending it out And signal processing means for detecting the direction of another light emitting / receiving device which is an emission source of the incident light beam based on the difference.

  In the transmitting / receiving apparatus according to the present invention, the condensing optical system, the first semi-transmissive surface, and the second semi-transmissive surface are configured as a part of an integrated optical element, and are emitted from the light emitting element. Since the optical axis of the outgoing light beam sent through the condensing optical system is coincident with the optical axis of the incident light beam that enters the condensing optical system and reaches the multi-divided light receiving element and the light receiving element, the number of parts is reduced. The transmission / reception device can be downsized and manufactured easily, and by using a drive mechanism such as a stepping motor and a deflection mirror, the optical axis adjustment between the transmission / reception device and other transmission / reception devices is highly accurate. And it becomes possible to carry out at high speed.

  Further, the multi-divided light receiving element, the light receiving element and the light emitting element are mounted on the substrate on the light receiving surface side or the light beam emitting side, and the multi-divided light receiving element and the light receiving element are transmitted through the substrate or provided on the substrate. When the incident light beam that has passed through the through-hole is received, and the light-emitting element transmits the emitted light beam through the substrate or through the through-hole provided in the substrate, a bare chip such as a light-receiving element The device can be reduced in size by mounting, and a high-precision mounting is possible because there is no height error due to variations in chip thickness. Further, the light emitting element emits light and / or the multi-divided light receiving element and light receiving. By performing light reception by the element, it is possible to adjust and fix the positions of the multi-divided light receiving element, the light receiving element, and the light emitting element based on the light detection output from the multi-divided light receiving element and the light receiving element.

  Further, when a wavelength selection filter is disposed at least on the optical path of the incident light beam incident on the light receiving element and only the light beam in a predetermined wavelength region is transmitted through the light beam incident by the wavelength selection filter, this The wavelength selective filter can block unnecessary light such as a light beam emitted from a light emitting element that becomes interference light, sunlight, or illumination light, and enables accurate optical axis adjustment.

  Further, when at least one of the driving means for driving the light emitting element and the amplifying means for amplifying the electric signal output from the light receiving element is provided on the substrate, at least one of the driving means and the amplifying means is the light receiving / emitting device. Therefore, it is not necessary to provide the transmitter / receiver separately, and the transmitter / receiver can be downsized and manufactured easily.

  The transmission / reception device according to the present invention is configured to include the light emitting / receiving device according to the present invention, so that downsizing and facilitation of manufacture are possible, and a driving mechanism such as a stepping motor and a deflection are possible. By using a mirror or the like, the optical axis adjustment with other transmission / reception devices can be performed with high accuracy and at high speed, and the device is suitable as a device used while moving.

  That is, the present invention relates to a light emitting / receiving device used in a transmission / reception device for transmitting data by transmitting an optical signal modulated based on a data signal and receiving and demodulating the optical signal modulated based on the data signal. A light receiving / emitting device capable of adjusting the optical axis between the transmitting / receiving device and another transmitting / receiving device with high accuracy and high speed while allowing the transmitting / receiving device to be reduced in size and manufactured easily. Can be provided.

  Further, according to the present invention, by using such a light receiving and emitting device, downsizing and facilitation of manufacture can be achieved, and optical axis adjustment with other transmitting / receiving devices can be performed with high accuracy and at high speed. A transmission / reception apparatus can be provided.

  Hereinafter, embodiments of a light receiving and emitting device according to the present invention and a transmitting and receiving device according to the present invention to which the light receiving and emitting device is applied will be described.

  FIG. 1 is a side view showing a configuration of an optical signal transmission system using a transmission / reception apparatus according to the present invention.

  As shown in FIG. 1, this optical signal transmission system is installed on a desk or the like, and is installed at an upper position such as a ceiling, such as a transmission / reception device serving as a plurality of slave units connected to a plurality of terminals (such as a personal computer). It is composed of a transmission / reception device as a parent device connected to a network trunk line or a server. In this optical signal transmission system, bidirectional beam transmission is performed between the transmission / reception device serving as the slave unit and the transmission / reception device serving as the parent unit.

  The optical signal transmission system includes a transmission / reception device serving as a plurality of slave units connected to a video reproduction device (TV tuner, video tape player (“VHS”), video disc player (“DVD”), etc.), a ceiling, and the like. Or a transmission / reception device serving as a parent device connected to a video display device (a “PDP” panel, a liquid crystal monitor, a TV receiver, a projector, or the like) installed at an upper position.

  The transmission / reception device serving as the slave unit and the transmission / reception device serving as the parent unit transmit laser light that has been intensity-modulated for data communication as an optical signal, and to the optical signal (laser light) incident from the other device. Based on this, the direction of the other device is detected, and after the optical axis is controlled and adjusted so that the optical axis of the transmitted light coincides with the optical axis of the incident light, data transmission is performed.

[First Embodiment]
FIG. 2 is a side view showing a configuration of a transmission / reception device using the light emitting / receiving device according to the first embodiment of the present invention.

  As shown in FIG. 2, this transmission / reception device includes a light emitting / receiving device 1 according to the present invention, a movable reflective optical system (deflection mirror) 2 capable of deflection control, a signal processing unit 3, and a deflection control unit 4. Composed.

  The light receiving / emitting device 1 includes a condensing optical system 5 that converges an incident light beam, a first semi-transmissive surface 6, and a second semi-transmissive surface 7. The condensing optical system 5, the first semi-transmissive surface 6, and the second semi-transmissive surface 7 are configured as a part of an integrated optical element. This optical element is formed by bonding a plurality of members made of a transparent material such as glass or synthetic resin, and by forming a metal film or an interference film on the bonding surface, the first and second members are formed. Semi-transparent surfaces 6 and 7. The condensing optical system 5 is configured by bulging a part of a member made of a transparent material into a convex lens shape, or by bonding a convex lens-shaped member to another member.

  In this light emitting / receiving device, incident light transmitted from another transmitting / receiving device as a communication partner is reflected by the movable reflective optical system 2 and enters the condensing optical system 5. The condensing optical system 5 converges incident light and makes it incident on the first semi-transmissive surface 6. The first semi-transmissive surface 6 is inclined by approximately 45 ° with respect to the incident light beam from the condensing optical system 5. The first semi-transmissive surface 6 reflects a part of the light beam incident from the condensing optical system 5 and transmits the remaining part. The light beam reflected by the first semi-transmissive surface 6 is incident on the second semi-transmissive surface 7. The second semi-transmissive surface 7 is inclined at approximately 45 ° with respect to the incident light beam from the first semi-transmissive surface 6. The second semi-transmissive surface 7 reflects a part of the light beam incident from the first semi-transmissive surface 6 and transmits the remaining portion.

  The reflected light from the second semi-transmissive surface 7 is diffused through the diffusing optical system 8 and is received by the multi-divided light receiving element 10 for detecting the direction of incident light through a wavelength selective filter 9 having wavelength selectivity. Is done. That is, the multi-segment light receiving element 10 receives the light beam reflected by the second semi-transmissive surface 7.

  The diffusing optical system 8 is an optical element that diffuses and transmits incident light, and is a diffusing material in which a sphere or dye having a slightly different refractive index is added to a transparent base material made of glass or a synthetic resin material. Or the surface of the transparent substrate has a diffusing action by sand plast processing or hologram processing. The diffusion optical system 8 can be configured integrally with an integrated optical element including the condensing optical system 5, the first semi-transmissive surface 6, and the second semi-transmissive surface 7. Further, the diffusion optical system 8 may be provided so as to be bonded to the second semi-transmissive surface 7.

  The wavelength selection filter 9 is configured by forming a dielectric multilayer film on a transparent base material such as glass or a synthetic resin material, and is in the vicinity of the wavelength (for example, 850 nm) of incident light (pilot light) from another transmitting / receiving device. Transmits light and blocks light in the vicinity of the wavelength (for example, 780 nm) of the light beam emitted from the light emitting element of the light emitting / receiving device, which becomes interference light in full-duplex communication, and unnecessary light such as sunlight and illumination light. .

  The condensing optical system 5 has a focal point on the light receiving surface of the multi-divided light receiving element 10, and the light beam diffused by the diffusing optical system 8 is irradiated around the focal position of the condensing optical system 5. The light receiving surface of the multi-divided light receiving element 10 arranged at the focal position of the condensing optical system 5 has a plurality of light receiving parts that are radially divided from the center, and the light irradiated to each light receiving part is received. It is converted into an electric current, and an independent light detection output can be obtained from each light receiving unit. These light detection outputs are sent to the signal processing unit 3 of the transmission / reception apparatus.

  By the way, if the incident light to the diffusing optical system 8 is perpendicularly incident due to the action of the diffusing optical system 8, not only the incident position and the distribution of the incident light beam but also the received light amount in each light receiving part of the multi-segment light receiving element 10 Are equal to each other. When the incident light to the diffusing optical system 8 is obliquely incident, a difference occurs in the amount of light received at each light receiving portion of the multi-segment light receiving element 10.

  In the signal processing unit 3, a deflection control signal is generated and supplied to the deflection control unit 4 so that the level difference between the output signals corresponding to the respective light receiving units of the multi-divided light receiving element 10 is reduced. In the deflection control unit 4, the movable reflective optical system 2 is controlled and deflected based on the deflection control signal so that the output signal levels from the respective light receiving units of the multi-divided light receiving element 10 are kept equal to each other. To.

  In this light emitting / receiving device, the diffusion optical system 8 is not an essential component, and can be configured without providing the diffusion optical system 8.

  On the other hand, the light beam that has passed through the second semi-transmissive surface 7 is reflected by the reflecting optical system 11, passes through the light receiving optical system 12 and the wavelength selection filter 9, and is received by the light receiving element 13 for data communication. That is, the light receiving element 13 receives the light beam transmitted through the second semi-transmissive surface 7. The light receiving element 13 converts the received light beam into a current and supplies it to a data processing unit (not shown) serving as a signal processing means. The data processing unit converts the electrical signal output from the light receiving element 13 into a digital signal and sends it out.

  The reflecting optical system 11 and the light receiving optical system 12 can be configured integrally with an integrated optical element including the condensing optical system 5, the first semi-transmissive surface 6, and the second semi-transmissive surface 7. . In addition, the reflection optical system 11 can be formed by using internal reflection (total reflection) of an optical material without performing film formation.

  The light emitting / receiving device includes a light emitting element 14. The light emitting element 14 emits a light beam modulated by the data signal, and sends this light beam through the condensing optical system 5. That is, the expanded light beam (laser light) emitted from the light emitting element 14 is converged or diverged by the light emitting optical system 15, then passes through the first semi-transmissive surface 6, and is collimated by the light collecting optical system 5. Is emitted as a light flux close to, reflected by the movable reflective optical system 2, and sent to another transmitting / receiving apparatus as a communication partner. The light emitting optical system 15 can be configured integrally with an integrated optical element including the condensing optical system 5, the first semi-transmissive surface 6, and the second semi-transmissive surface 7.

  The optical axis of the outgoing light beam emitted from the light emitting element 14 and sent out through the condensing optical system 5 is equal to the optical axis of the incident light beam that enters the condensing optical system 5 and reaches the multi-segment light receiving element 10 and the light receiving element 14. I'm doing it. That is, the optical axis of the transmitted light from the light receiving and emitting device is matched in advance with the optical axis of the optical system for receiving light including the multi-divided light receiving element 10, and is output from each light receiving unit of the multi-divided light receiving element 10. In a state where the signal levels are equal to each other, the optical axis of the transmitted light from this light emitting / receiving device and the optical axis of the incident light from other transmitting / receiving devices are the same.

  The light emitting / receiving device includes at least one substrate 16. The substrate 16 fixes and holds the multi-segment light receiving element 10, the light receiving element 13, and the light emitting element 14. On the substrate 16, at least one of a driving unit (driving circuit) for driving the light emitting element 14 and an amplifying unit (amplifying circuit) for amplifying an electric signal output from the light receiving element 13 is provided. .

  The substrate 16 is attached to an integrated optical element including the condensing optical system 5, the first semi-transmissive surface 6, and the second semi-transmissive surface 7 via a holding member 17. Note that the diffusing optical system 8, the light receiving optical system 12, and the light emitting optical system 15 may be provided by being bonded to the holding member 17.

  In this light receiving and emitting device, the wavelength selection filter 9 may be formed on the light receiving surface of the multi-divided light receiving element 10 or the light receiving element 13, and the second semi-transmissive surface 7 and the reflection optical system 11 may be provided. Alternatively, a film may be formed on the exit surface of the light receiving optical system 12 or the exit surface of the light receiving optical system 12. Further, by appropriately setting the wavelength characteristics (spectral characteristics) of reflection and transmission of the second semi-transmissive surface 7, the function of the wavelength selection filter 9 can be achieved.

  Further, when the wavelength selection filter 9 is not provided, the luminous flux emitted from the light emitting element 14 reaches the multi-divided light receiving element 10 and the light receiving element 13 via the light emitting optical system 15 and the first semi-transmissive surface 6. If the unnecessary light is a light amount that does not affect the transmission performance of the light emitting and receiving device, a structure without the wavelength selection filter 9 may be used.

  Further, in this light receiving and emitting device, the diffusion optical system 8 and the multi-divided light receiving element 10, and the light receiving optical system 12 and the light receiving element 13 can also be configured in a state in which their positional relationships are interchanged.

  FIG. 3 is a side view showing another configuration of the transmission / reception device using the light emitting / receiving device according to the first embodiment of the present invention.

  In the light receiving and emitting device, in the configuration of the first embodiment, as shown in FIG. 3, the condensing optical system 5, the light emitting optical system 15, and the light receiving optical system 12 are parallel to each other such as glass or synthetic resin material. A flat plate can be configured as a Fresnel lens formed by etching or injection molding, a rotationally symmetric diffraction element, or a hologram.

  The light emitting optical system 15, the diffusion optical system 8, and the light receiving optical system 12 can be configured on the same integral parallel plate.

  By adopting such a configuration, it is possible to reduce the size of the apparatus configuration, to easily manufacture and assemble optical components, and to reduce costs by reducing the number of components.

[Second Embodiment]
FIG. 4 is a side view showing a configuration of a transmission / reception device using the light emitting / receiving device according to the second embodiment of the present invention.

  As shown in FIG. 4, the light emitting and receiving device according to the present invention is formed as a parallel plate made of a transparent material such as glass or synthetic resin material, as shown in FIG. The divided light receiving element 10, the light receiving element 13, and the light emitting element 14 can be configured to be mounted on the substrate 16 on the light receiving surface side or the light beam emitting side. In this case, the multi-segment light receiving element 10 and the light receiving element 13 receive the incident light flux that has passed through the substrate 16. The light emitting element 14 transmits the emitted light beam through the substrate 16 and enters the condensing optical system 5 through the light emitting optical system 15.

  In this light emitting and receiving device, even after the holding member 17 and the optical element are mounted on the substrate 16, the multi-segment light receiving element 10, the light receiving element 13, and the light emitting element 14 are located on the outer surface of the substrate 16. Therefore, it becomes easy to assemble while adjusting the position of each optical system and each element so that the optical axes of the incident optical signal and the outgoing optical signal coincide. Further, since the light emitting element 14 is positioned on the outer surface of the substrate 16, heat radiation (cooling) during light emission of the light emitting element 14 is facilitated.

  FIG. 5 is a side view showing another configuration of the transmission / reception device using the light emitting / receiving device according to the second embodiment of the present invention.

  In the light receiving and emitting device, in the configuration of the second embodiment, as shown in FIG. 5, the condensing optical system 5, the light emitting optical system 15, and the light receiving optical system 12 are parallel to each other such as glass or synthetic resin material. A flat plate can be configured as a Fresnel lens formed by etching or injection molding, a rotationally symmetric diffraction element, or a hologram. The light emitting optical system 15, the diffusion optical system 8, and the light receiving optical system 12 can be configured on the same integral parallel plate.

  In this case, by appropriately setting the thickness of the substrate 16, the light emitting optical system 15, the diffusion optical system 8, and the light receiving optical system 12 are provided to the substrate 16 without using the holding member 17. The formed parallel plate can be directly attached.

  In this case, the wavelength selection filter 9 is the surface of the substrate 16, the surface of the parallel plate on which the light emitting optical system 15, the diffusion optical system 8 and the light receiving optical system 12 are formed, or the multi-segment light receiving element 10 and It can be formed on the light receiving surface of the light receiving element 13. Further, by appropriately setting the wavelength characteristics (spectral characteristics) of reflection and transmission of the second semi-transmissive surface 7, the function of the wavelength selection filter 9 can be achieved.

  By adopting such a configuration, it is possible to reduce the size of the apparatus configuration, to easily manufacture and assemble optical components, and to reduce costs by reducing the number of components.

  FIG. 6 is a side view showing still another configuration of the transmission / reception device using the light emitting / receiving device according to the second embodiment of the present invention.

  In this light receiving and emitting device, in the configuration of the second embodiment, as shown in FIG. 6, the diffusion optical system 8, the light emitting optical system 15 and the light receiving optical system 12 are provided on a substrate 16 made of a transparent material. It can be configured as a Fresnel lens formed by etching or injection molding, a rotationally symmetric diffraction element, or a hologram. That is, on the substrate 16, the diffusion optical system 8, the light emitting optical system 15, and the light receiving optical system 12 are formed on the upper surface portion, and the multi-segment light receiving element 10, the light receiving element 13, and the light emitting element 14 are mounted on the lower surface portion.

  In this case, the thickness of the substrate 16 is set appropriately, and without using the holding member 17, the condensing optical system 5, the first semi-transmissive surface 6, and the second semi-transmissive surface with respect to the substrate 16. An integral optical element including the surface 7 is directly attached.

  In this case, the wavelength selection filter 9 is a surface of an integrated optical element including the condensing optical system 5, the first semi-transmissive surface 6 and the second semi-transmissive surface 7, or the multi-divided light receiving device 10 and the light receiving device. It can be formed on the light receiving surface of the element 13. Further, by appropriately setting the wavelength characteristics (spectral characteristics) of reflection and transmission of the second semi-transmissive surface 7, the function of the wavelength selection filter 9 can be achieved.

  By adopting such a configuration, it is possible to reduce the size of the apparatus configuration, to easily manufacture and assemble optical components, and to reduce costs by reducing the number of components.

[Third Embodiment]
FIG. 7 is a side view showing a configuration of a transmission / reception device using the light emitting / receiving device according to the third embodiment of the present invention.

  As shown in FIG. 7, the light receiving and emitting device according to the present invention is formed by providing a through-hole 16a in a substrate 16 as shown in FIG. The light emitting element 14 can be configured to be mounted on the substrate 16 on the light receiving surface side or the light beam emitting side. In this case, the multi-segment light receiving element 10 and the light receiving element 13 receive the incident light flux that has passed through the through hole 16 a of the substrate 16. The light emitting element 14 causes the emitted light beam to pass through the through hole 16 a of the substrate 16 and enter the condensing optical system 5 via the light emitting optical system 15.

  In this light emitting and receiving device, even after the holding member 17 and the optical element are mounted on the substrate 16, the multi-segment light receiving element 10, the light receiving element 13, and the light emitting element 14 are located on the outer surface of the substrate 16. Therefore, it becomes easy to assemble while adjusting the position of each optical system and each element so that the optical axes of the incident optical signal and the outgoing optical signal coincide. Further, since the light emitting element 14 is positioned on the outer surface of the substrate 16, heat radiation (cooling) during light emission of the light emitting element 14 is facilitated.

  FIG. 8 is a side view showing another configuration of the transmission / reception device using the light emitting / receiving device according to the third embodiment of the present invention.

  In the light receiving and emitting device, in the configuration of the third embodiment, as shown in FIG. 8, the condensing optical system 5, the light emitting optical system 15, and the light receiving optical system 12 are parallel to each other such as glass or synthetic resin material. A flat plate can be configured as a Fresnel lens formed by etching or injection molding, a rotationally symmetric diffraction element, or a hologram. The light emitting optical system 15, the diffusion optical system 8, and the light receiving optical system 12 can be configured on the same integral parallel plate.

  In this case, by appropriately setting the thickness of the substrate 16, the light emitting optical system 15, the diffusion optical system 8, and the light receiving optical system 12 are provided to the substrate 16 without using the holding member 17. The formed parallel plate can be directly attached.

  In this case, the wavelength selection filter 9 is provided on the surface of a parallel plate on which the light emitting optical system 15, the diffusion optical system 8 and the light receiving optical system 12 are formed, or on the light receiving surfaces of the multi-segment light receiving element 10 and the light receiving element 13. Can be formed. Further, by appropriately setting the wavelength characteristics (spectral characteristics) of reflection and transmission of the second semi-transmissive surface 7, the function of the wavelength selection filter 9 can be achieved.

  By adopting such a configuration, it is possible to reduce the size of the apparatus configuration, to easily manufacture and assemble optical components, and to reduce costs by reducing the number of components.

[Fourth Embodiment]
FIG. 9 is a side view showing a configuration of a transmission / reception device using the light emitting / receiving device according to the fourth embodiment of the present invention.

  As shown in FIG. 9, the light receiving and emitting device according to the present invention includes the light receiving element 13 without the reflective optical system 11 in each of the above embodiments, as shown in FIG. It is possible to configure so that the light beam transmitted through the two semi-transmissive surfaces 7 enters without being deflected as it is. In this case, the light receiving element 13 is attached to a substrate 16b installed perpendicular to the substrate 16 to which the multi-segment light receiving element 10 is attached.

  In this case, the wavelength selection filter 9 is provided on the optical path between the second semi-transmissive surface 7 and the light receiving element 13, and further the light between the second semi-transmissive surface 7 and the multi-divided light receiving element 10. It can also be installed on the road. Further, by appropriately setting the wavelength characteristics (spectral characteristics) of reflection and transmission of the second semi-transmissive surface 7, the function of the wavelength selection filter 9 can be achieved.

  In this case, the multi-segment light receiving element 10 and the light receiving element 13 can also be configured in a state in which the mutual positional relationship is exchanged.

  FIG. 10 is a side view showing another configuration of the transmission / reception device using the light emitting / receiving device according to the fourth embodiment of the present invention.

  In this light emitting / receiving device, in the configuration of the fourth embodiment, as shown in FIG. 10, the condensing optical system 5 and the light emitting optical system 15 are etched on a parallel plate such as glass or a synthetic resin material. Alternatively, it can be configured as a Fresnel lens formed by injection molding, a rotationally symmetric diffraction element, or a hologram. Further, the light emitting optical system 15 and the diffusion optical system 8 can be configured on the same integral parallel plate.

  In this case, the wavelength selection filter 9 can be formed on the surface of a parallel plate on which the light emitting optical system 15 and the diffusion optical system 8 are formed, or on the light receiving surfaces of the multi-segment light receiving element 10 and the light receiving element 13. Further, by appropriately setting the wavelength characteristics (spectral characteristics) of reflection and transmission of the second semi-transmissive surface 7, the function of the wavelength selection filter 9 can be achieved.

  By adopting such a configuration, it is possible to reduce the size of the apparatus configuration, to easily manufacture and assemble optical components, and to reduce costs by reducing the number of components.

[Fifth Embodiment]
FIG. 11 is a side view showing a configuration of a transmission / reception device using the light emitting / receiving device according to the fifth embodiment of the present invention.

  As shown in FIG. 11, the light emitting and receiving device according to the present invention is an optical element integrated with a condensing optical system 5 that converges an incident light beam, a first semi-transmissive surface 6, and a second semi-transmissive surface 7. The light beam transmitted from the other transmission / reception device as the communication partner and incident on the condensing optical system 5 passes through the first semi-transmissive surface 6 and passes through the diffusion optical system 8 to receive the multi-divided light. You may comprise so that it may receive with the element 10. FIG.

  In this case, the light beam reflected by the first semi-transmissive surface 6 enters the second semi-transmissive film 7, and the light beam reflected by the second semi-transmissive film 7 passes through the wavelength selection filter 9. Light is received by the light receiving element 13.

  In this case, the wavelength selection filter 9 is provided on the optical path between the second semi-transmissive surface 7 and the light receiving element 13, and further the light between the first semi-transmissive surface 6 and the multi-divided light receiving element 10. It can also be installed on the road. Further, by appropriately setting the wavelength characteristics (spectral characteristics) of reflection and transmission of the first and second semi-transmissive surfaces 6 and 7, the function of the wavelength selection filter 9 can be achieved.

  In this light emitting / receiving device, the light beam emitted from the light emitting element 14 passes through the second semi-transmissive film 7, is reflected by the first semi-transmissive film 6, and is transmitted through the condensing optical system 5. Is done.

  In this light emitting / receiving device, the multi-segment light receiving element 10 is attached to a substrate 16 formed of a transparent material. The multi-segment light receiving element 10 is mounted on the substrate 16 on the light receiving surface side. The multi-segment light receiving element 10 receives an incident light beam that has passed through the substrate 16.

  The light receiving element 13 is attached to a substrate 16 formed of a transparent material separate from the substrate 16 to which the multi-segment light receiving element 10 is attached. The light receiving element 13 is mounted on the substrate 16 on the light receiving surface side. The light receiving element 13 receives the incident light beam transmitted through the substrate 16.

  Further, the light emitting element 14 is attached to a substrate 16 formed of a transparent material installed perpendicular to the substrate 16 to which the multi-segment light receiving element 10 is attached. The light emitting element 14 is mounted on the substrate 16 on the light beam emission side. The light emitting element 14 transmits the emitted light beam through the substrate 16 and enters the condensing optical system 5 through the semi-transmissive surfaces 7 and 6.

  In this light emitting / receiving device, the multi-divided light receiving element 10, the light receiving element 13, and the light emitting element 14 are positioned on the outer surface of the substrate 16, so that the position of each optical system and each element is determined as an incident light signal and an emitted light signal. It is easy to assemble while adjusting so that the optical axis matches. Further, since the light emitting element 14 is positioned on the outer surface of the substrate 16, heat radiation (cooling) during light emission of the light emitting element 14 is easy.

  In this light emitting and receiving device, the condensing optical system 5, the first semi-transmissive surface 6, and the second semi-transmissive surface 7 are set with respect to the substrate 16 by appropriately setting the thickness of the substrate 16. An integral optical element including can be directly attached.

  In this light receiving and emitting device, a wavelength selection filter can be formed on the light receiving surfaces of the multi-segment light receiving element 10 and the light receiving element 13. Further, in this light emitting / receiving device, by appropriately setting the wavelength characteristics (spectral characteristics) of reflection and transmission of the first and second semi-transmissive surfaces 6 and 7, the function of the wavelength selection filter can be achieved. .

  Moreover, in this light emitting / receiving device, the light emitting element 14 and the light receiving element 13 can also be configured in a state in which the mutual positional relationship is exchanged.

  FIG. 12 is a side view showing another configuration of the transmission / reception device using the light emitting / receiving device according to the fifth embodiment of the present invention.

  In this light receiving and emitting device, in the configuration of the fifth embodiment, as shown in FIG. 12, the condensing optical system 5 is formed by etching or injection molding on a parallel plate such as glass or synthetic resin material. It can be configured as a Fresnel lens, a rotationally symmetric diffraction element, or a hologram.

  By adopting such a configuration, it is possible to reduce the size of the apparatus configuration, to easily manufacture and assemble optical components, and to reduce costs by reducing the number of components.

It is a side view which shows the structure of the optical signal transmission system using the transmission / reception apparatus which concerns on this invention. It is a side view which shows the structure of the transmission / reception apparatus using the light emitting / receiving apparatus in the 1st Embodiment of this invention. It is a side view which shows another structure of the transmission / reception apparatus using the light emitting / receiving apparatus in the 1st Embodiment of this invention. It is a side view which shows the structure of the transmission / reception apparatus using the light emitting / receiving apparatus in the 2nd Embodiment of this invention. It is a side view which shows another structure of the transmission / reception apparatus using the light emitting / receiving apparatus in the 2nd Embodiment of this invention. It is a side view which shows another structure of the transmission / reception apparatus using the light emitting / receiving apparatus in the 2nd Embodiment of this invention. It is a side view which shows the structure of the transmission / reception apparatus using the light emitting / receiving apparatus in the 3rd Embodiment of this invention. It is a side view which shows another structure of the transmission / reception apparatus using the light emitting / receiving apparatus in the 3rd Embodiment of this invention. It is a side view which shows the structure of the transmission / reception apparatus using the light emitting / receiving apparatus in the 4th Embodiment of this invention. It is a side view which shows another structure of the transmission / reception apparatus using the light emitting / receiving apparatus in the 4th Embodiment of this invention. It is a side view which shows the structure of the transmission / reception apparatus using the light emitting / receiving apparatus in the 5th Embodiment of this invention. It is a side view which shows another structure of the transmission / reception apparatus using the light emitting / receiving apparatus in the 5th Embodiment of this invention. It is a perspective view which shows the structure of the conventional transmission / reception apparatus.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Light emitting / receiving apparatus 3 Signal processing means 5 Condensing optical system 6 1st semi-transmissive surface 7 2nd semi-transmissive surface 10 Multi-segment light receiving element 13 Light receiving element 14 Light emitting element 16 Substrate 16a Through-hole

Claims (5)

A movable reflective optical system that reflects and deflects the incident light beam;
A condensing optical system for converging the light beam deflected by the movable reflective optical system;
A first semi-transmissive surface that receives a light beam converged by the condensing optical system, reflects a part of the light beam, and transmits the remaining part;
A second semi-transmissive surface that reflects a part of the light beam reflected on the first semi-transmissive surface and transmits the remaining part;
The second semi-transmissive layer is formed by adhering a diffusing material added with spheres or dyes having different refractive indexes to a transparent substrate, or by subjecting the surface of the transparent substrate to sandblasting or hologram processing. A diffusion optical system for diffusing the light beam reflected by the surface;
A multi-divided light receiving element having a light receiving surface having a plurality of light-receiving portions at the focal position of the condensing optical system, receives the light beam diffused by the diffusion optical system by the plurality of light receiving portions,
A light receiving element for receiving a light beam transmitted through the second semi-transmissive surface;
A light emitting element that emits a light beam modulated by a data signal and sends the light beam through the condensing optical system;
At least one substrate for fixing the multi-divided light receiving element, the light receiving element and the light emitting element;
By making the levels of the output signals corresponding to the respective light receiving portions of the multi-divided light receiving element equal to each other, the optical axis of the emitted light beam emitted from the light emitting element and transmitted through the condensing optical system, and the light collecting A light receiving / emitting device comprising: a multi-divided light receiving element that enters the optical system; and a deflection control unit that controls the movable reflective optical system so as to coincide with an optical axis of an incident light beam reaching the light receiving element. . The multi-divided light receiving element, the light receiving element and the light emitting element are mounted on the substrate on the light receiving surface side or the light beam emitting side,
The multi-divided light receiving element and the light receiving element receive the incident light flux that has passed through the substrate or passed through a through hole provided in the substrate,
The light emitting and receiving device according to claim 1, wherein the light emitting element transmits the emitted light beam through the substrate or through a through hole provided in the substrate. A wavelength selection filter is disposed on at least the optical path of the incident light beam incident on the light receiving element,
3. The light receiving and emitting device according to claim 1, wherein the wavelength selection filter transmits only a light beam having a predetermined wavelength range among incident light beams. 4. The device according to claim 1, wherein at least one of a driving unit that drives the light emitting element and an amplifying unit that amplifies an electric signal output from the light receiving element is provided on the substrate. 5. The light emitting / receiving device according to any one of the above. A transmission / reception apparatus for transmitting data by transmitting an optical signal modulated based on a data signal and receiving and demodulating an optical signal modulated based on the data signal,
The light emitting and receiving device according to any one of claims 1 to 4,
The electrical signal output from the light receiving element is converted into a digital signal and transmitted, and the other is an emission source of incident light flux based on the level difference of the electrical signal output from each light receiving portion of the multi-divided light receiving element And a signal processing means for detecting the direction of the light emitting / receiving device.

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