Abstract:
This invention solves this problem by including an optical transmitter module and optical receiver module inside the connector so as to carry out spatial optical transmitting of optical signal obtained by conversion with the optical transmitter module for optical transmitting between the optical transmitter module and the optical receiver module opposing each other across space.

Description:
BACKGROUND OF THE INVENTION 
   1. Field of the Invention 
   The present invention relates to an optical connector, more particularly to an optical connector having an optical transmitter module and an optical receiver module for transmitting information by spatial optical transmitting inside the connector. The disclosures of Japanese Patent Application No. 2005-149998 filed May, 23, 2005 including specification, drawings and claims are incorporated herein by reference in its entirety. 
   2. Description of the Related Art 
   An electronic apparatus such as personal computer executes data communication with peripheral devices, for example, a mouse, a printer, a keyboard connected outside of the main body in order to intensify its function and a variety of means for executing data communication with the personal computer connected to such peripheral devices are provided (see, for example, Japanese Patent Application Laid-Open No.11-187143 and Japanese Patent Application Laid-Open No.11-136869). 
   Further, in recent years, universal serial bus (USB) has been widely used to intensify expandability between an electronic apparatus such as personal computer and the peripheral devices. This USB is serial interface standard which can be used commonly for communication based on USB standard between the personal computer and the peripheral devices such as a printer, and a mouse. Because using the USB standard enables the peripheral devices such as the printer to be connected or disconnected easily with the personal computer powered on, availability of data communication between the peripheral device and the personal computer is improved considerably. 
   A USB cable is used for connecting an apparatus main body to the peripheral devices electrically to exchange signals between an electronic apparatus such as the personal computer and the peripheral devices and a USB connector is used as a connector for connecting this USB cable to the apparatus main body or the peripheral devices (see for example, Japanese Patent Application Laid-Open No.2004-336512). 
   SUMMARY OF THE INVENTION 
   The USB connector is connected physically to a conductive terminal to execute communication of data and power feeding using electricity as medium. In such physical connection, the USB is connected/disconnected frequently or often used violently by a user so that there occurs such a problem that communication fails due to damage of the wiring and therefore, this problem has been demanded to be solved. 
   Therefore, an object of the present invention is to provide a reliable optical connector capable of preventing connection failure due to damage of wiring and having a high durability to connecting/disconnecting action in order to solve the above-described problem. 
   The present invention achieves the above-described object by disposing an optical transmitter module and optical receiver module inside a connector and executing spatial optical transmitting of optical signal obtained by conversion by the optical transmitter module for optical transmitting between the optical transmitter module and the optical receiver module opposing each other across space. 
   More specifically, according to a first aspect of the present invention, there is provided an optical connector for connecting electronic apparatuses or an electronic apparatus with a peripheral device and having a first connector and second connector for transmitting information between such apparatuses or devices, wherein the first connector includes at least an optical transmitter module that converts electric signal input to interior of a case to optical signal and transmits to the second connector; the second connector includes at least an optical receiver module that are opposed the optical transmitter module of the first connector inside the case, converts optical signal from the optical transmitter module of the first connector and outputs; and the first connector and the second connector are connectable/disconnectable. 
   The invention of this aspect can provide an optical connector in which no connection failure due to damage of wiring occurs and having semi-permanent durability against frequent connecting/disconnecting actions because the optical transmitter module and optical receiver module are disposed inside the case without using any physical connection such that they are opposed to each other so as to transmit information by spatial optical transmitting. 
   Further, high-speed transmitting and high-capacity transmitting can be achieved by adopting optical transmitting as a transmitting means for data information. Further, because such optical transmitting is carried out inside the case, cross talk can be suppressed and the eye safety can be secured, thereby ensuring reliability and safety. 
   In the meantime, as the electronic apparatus to be connected, for example, personal computer (including a case where it is connected to a cradle) and digital apparatuses can be mentioned and as the peripheral device, for example, a mouse, a printer, a keyboard, a digital still camera, a digital video camera, an USB memory and the like can be mentioned. 
   According to a second aspect of the invention, there is provided the optical connector according to the first aspect wherein the first connector includes plural optical transmitter modules and the second connector includes plural optical receiver modules corresponding to the optical transmitter modules. 
   Because the present invention employs a plurality of the optical transmitter modules to be disposed in the first connector and a plurality of the optical receiver modules to be disposed in the second connector, plural optical transmitting can be executed in a single direction thereby achieving high-speed transmitting of information. 
   According to a third aspect of the present invention, there is provided an optical connector for connecting electronic apparatuses or an electronic apparatus with a peripheral device and having a first connector and second connector for transmitting information between such apparatuses or devices, wherein the first connector includes at least an optical transmitter module that converts electric signal input to interior of the case to optical signal and sends to the second connector and at least an optical receiver module that receives optical signal from the second connector, converts to electric signal and outputs; the second connector includes at least an optical receiver module that is opposed to the optical transmitter module of the first connector inside the case, converts optical signal from the optical transmitter module of the first connector to electric signal and outputs and an optical transmitter module that is opposed to the optical receiver module of the first connector, converts the input electric signal to optical signal and sends to the optical receiver module of the first connector; and the first connector and the second connector are connectable/disconnectable. 
   Consequently, the present invention enables bi-directional optical transmitting to be executed so as to achieve diversification of information transmitting because the optical transmitter module and optical receiver module are disposed in the first connector and second connector. 
   According to a fourth aspect of the present invention, there is provided the optical connector according to the second or third aspect, wherein light shielding bodies are disposed inside the first connector and the second connector so that passages of optical signals transmitted by the optical transmitter modules of the first connector or the second connector are separated by the light shielding bodies. 
   As a consequence, the present invention can execute stable spatial optical transmitting without any interference of optical signals because the passages of optical signals are separated by the light shielding bodies. 
   According to a fifth aspect of the present invention, there is provided the optical connector according to the second or third aspect, wherein the wavelengths of optical signals transmitted by the optical transmitter modules of the first connector and the second connector are different from each other and the optical receiver module corresponding to the optical transmitter module includes a wavelength selecting filter that allows only the wavelength of optical signal transmitted by the corresponding optical transmitter module to pass through. 
   Because the wavelengths of optical signals emitted from the optical transmitter modules are set different from each other and the optical receiver module includes a wavelength selecting filter which allows only the wavelength of optical signal emitted from a corresponding optical transmitter module to pass through, the present invention enables the optical receiver module to receive optical signal from the corresponding optical transmitter module securely, thereby achieving stable spatial optical transmitting. 
   According to a sixth aspect of the present invention, there is provided the optical connector according to the second or third aspect, wherein the wavelengths of optical signals transmitted by the optical transmitter modules of the first connector and the second connector are different from each other and the light receiving element (element?) disposed in the optical receiver module corresponding to the optical transmitter module receives only the wavelength of optical signal transmitted from the corresponding optical transmitter module selectively. 
   Because the wavelengths of the optical signals emitted from the optical transmitter modules are set different from each other and the light receiving element disposed in the optical receiver module receives only the wavelength of optical signal emitted from a corresponding optical transmitter module selectively, the present invention enables the optical receiver module to receive optical signal from a corresponding optical transmitter module securely like mentioned in the fifth aspect, thereby achieving stable spatial optical transmitting. 
   According to a seventh aspect of the present invention, there is provided an optical connector for connecting electronic apparatuses or an electronic apparatus with a peripheral device and having a first connector and a second connector for transmitting information between the electronic apparatuses or the electronic apparatus and the peripheral devices, wherein the first connector includes an optical transmitter/receiver module having at least a light transmitting portion that converts electric signal input to interior of a case to optical signal and sends to the second connector, at least a light receiving portion that receives optical signal having a wavelength different from the optical signal of the light transmitting portion from the second connector, converts to electric signal and outputs, and a wavelength selecting filter that directs optical signal from the second connector to the light receiving portion and directs optical signal from the light transmitting portion to the second connector; the second connector includes an optical transmitter/receiver module having at least a light receiving portion that is opposed to the optical transmitter/receiver module of the first connector inside the case and converts optical signal from the light transmitting portion of the first connector to electric signal and outputs, a light transmitting portion that converts the input electric signal to optical signal and sends to the light receiving portion of the first connector, and a wavelength selecting filter that directs optical signal from the light transmitting portion of the first connector to the light receiving portion of the second connector and directs optical signal from the light transmitting portion of the second connector to the light receiving portion of the first connector; and the first connector and the second connector are connectable/disconnectable. 
   As a consequence, the present invention can execute bi-directional optical transmitting so as to achieve diversification of information transmitting because the optical transmitter/receiver modules are disposed in the first connector and the second connector to execute the optical transmitting. Further, adopting the optical transmitter/receiver module enables the quantity of necessary components and necessary space to be reduced as compared with the optical connector of the third aspect, thereby achieving reduction in the size of the optical connector preferably. 
   According to an eighth aspect of the present invention, there is provided the optical connector according to any one of the first to seventh aspect, wherein the cases are formed of conductive material and the cases are connected electrically through contact between the first connector and the second connector thereby enabling supply of electric signal or direct current through the cases. 
   Because the cases formed of conductive material make physical contact with each other when the first connector and the second connector are connected, the present invention can execute power feeding (supply of direct current) of supplying current between the both connectors and supply of electric signals (data communication). 
   According to a ninth aspect of the present invention, there is provided the optical connector according to any one of the first to eighth aspect further including an optical transmitter module for power feeding that supplies electricity to interior of the case of the first connector in the form of light and an optical receiver module for power receiving that is supplied with electricity to interior of the case of the second connector. 
   Because the optical connector according to the present invention includes the optical transmitter module for power feeding which supplies electricity in the form of light and the optical receiver module for power receiving of being supplied with electricity in the form of light, the optical connector capable of transmitting electricity as well as information optionally can be provided. 
   EFFECT OF THE INVENTION 
   The optical connector of the present invention executes transmitting of data information through optical transmitting with the optical transmitter module and optical receiver module without any contact between them inside the case by disposing the optical transmitter module and the optical receiver module inside a case to be opposed to each other without using the conventional structure for data information transmitting with conductive terminals connected physical contact. As a consequence, an optical connector capable of preventing connection failure due to damage of wiring and having semi-permanent durability against connecting/disconnecting actions can be provided. Further, because optical transmitting is adopted as a transmitting means of data information, high-speed transmitting and high-capacity transmitting can be achieved. Further, leakage of light can be suppressed to achieve the eye safety by executing optical transmitting inside the case thereby providing an optical connector excellent in reliability and safety. 

   
     BRIEF DESCRIPTION OF THE DRAWINGS 
       FIGS. 1A and 1B  are schematic diagrams showing a connector according to a first embodiment of the present invention; 
       FIG. 2  is a schematic view showing the structure of the interior of a case of the optical connector according to the first embodiment; 
       FIG. 3  is a schematic view showing an embodiment of the structure of the case; 
       FIG. 4  is a schematic view showing another embodiment of the structure of the case; 
       FIG. 5  is a schematic diagram showing the structure of interior of the case of the optical connector according to a second embodiment of the present invention; 
       FIG. 6  is a schematic diagram showing the structure of interior of the case of the optical connector according to the third embodiment of the present invention; 
       FIG. 7  is a schematic diagram showing the structure of interior of the case of the optical connector according to the fourth embodiment of the present invention; 
       FIG. 8  is a schematic diagram showing the structure of interior of the case of the optical connector according to the fifth embodiment of the present invention; 
       FIG. 9  is a schematic diagram showing the structure of interior of the case according to another embodiment of the optical connector of the present invention; and 
       FIG. 10  is a schematic diagram showing the structure of interior of the case of the optical connector according to the sixth embodiment of the present invention. 
   

   DESCRIPTION OF THE PREFERRED EMBODIMENTS 
   Hereinafter, an embodiment of the present invention will be described with reference to the accompanying drawings. 
   (I) First Embodiment 
   (A) Optical Connector  1 : 
     FIGS. 1A and 1B  are diagrams showing an embodiment of the optical connector of the present invention,  FIG. 1A  is a schematic view showing a condition in which a first connector and a second connector are disconnected and  FIG. 1B  is a schematic view showing a condition in which the first connector and the second connector are connected. 
     FIG. 2  is a schematic diagram showing the structure of the interior of the case in the condition of  FIG. 1B  (condition in which both the connectors are connected). 
   The optical connector  1  of this embodiment includes a first connector  11  in which an optical transmitter module  111  is disposed inside a case  117  and a second connector  12  in which an optical receiver module  121  is disposed inside a case  127  and the first connector  11  and the second connector  12  are connectable/disconnectable as shown in  FIGS. 1A and 1B . More specifically, by inserting the first connector  11  into the second connector  12  in the condition of  FIG. 1A  in the direction of an arrow of  FIG. 1A , both the connectors are connected in the condition of  FIG. 1B . 
   When the first connector  11  and the second connector  12  are connected as shown in  FIG. 2 , an optical transmitter module  111  and an optical receiver module  121  are opposed to each other across space. 
   Because the optical connector  1  having the structure shown in  FIGS. 1A ,  1 B and  2  can transmit data in a single direction (from the first connector  11  to the second connector  12 ) by optical transmitting, for example, a device connecting portion  113  of the first connector  11  may be connected to a digital still camera, as a peripheral device (DSC) (not shown), and a device connecting portion  123  of the second connector  12  may be connected to a cradle (not shown) which is connected to a personal computer as an electronic apparatus, in order to transmit a large amount of image data from the DSC to the cradle. 
   (B) Optical Transmitter Module  111  and Optical Receiver Module  121 : 
   The optical transmitter module  111  disposed at an end of the first connector  11  constituting the optical connector  1  is accommodated (implanted?) partially in a molding portion  118  and includes a light emission element  112  such as light emitting diode (LED) and a driver (not shown). A device connecting portion  113  is provided at the other end of the first connector  11  and connected to a predetermined connecting portion formed in the DSC (not shown) as a peripheral device. 
   The optical transmitter module  111  receives data (electric signal) outputted from the DSC side through a terminal (not shown) formed inside this device connecting portion  113  and supplies the data to a driver (not shown). The driver drives a light emitting element  112  using this data signal and the driven light emitting element  112  converts input electric signal to optical signal for optical transmitting and then emits light to an optical receiver module  121  opposing each other across space through a lens  114 . 
   On the other hand, the optical receiver module  121  disposed at an end of the second connector  12  is accommodated partially in a molding portion  128  and includes, for example, a light receiving element  122  such as a photo diode. This light receiving element  122  receives optical signal from the light emitting element  112  of the optical transmitter module  111  through a lens  124  and converts received optical signal to electric signal. The converted electric signal is output to a terminal (not shown) of the device connecting portion  123  formed at the other end of the second connector  12  and sent to the cradle connected to the device connecting portion  123 . As a consequence, data transmitted from the DSC (for example, image data) can be received by the cradle (not shown) through the optical connector  1 . In the meantime, this optical receiver module  121  may be provided with a buffer (not shown) to store received data temporarily. 
   To execute optical transmitting effectively, an interval between the optical transmitter module  111  and the optical receiver module  121  when the first connector  11  and the second connector  12  are connected may be less than or equal to 50 mm. Such data transmitting by optical transmitting enables high-speed communication of several tens to several hundreds times a conventional case, thereby achieving, for example, a data transmitting speed of 100 Mbps or more (10 Gbps as upper limit). 
   (C) Case  117 ,  127 ; 
   The optical transmitter module  111  and the optical receiver module  121  are held and fixed in a case constituting the first connector  11  and the second connector  12  (the former is a case  117  and the latter is a case  127 ). These cases  117 ,  127  have a substantially rectangular section and are formed of conductive material, for example, metal such as aluminum, iron, stainless steel, nickel and copper and alloy thereof. 
   To connect the first connector  11  to the second connector  12 , a front end of the case constituting the first connector  11  (the case  117 ) is inserted into an opening portion  127   a  (see  FIG. 1A ) at the front end of the case constituting the second connector  12  (the case  127 ) so as to integrate the first connector  11  with the second connector  12 . Because both of the cases  117 ,  127  are formed of conductive material in this case, when the case  117  and the case  127  are integrated in contact with each other, it comes that the cases  117 ,  127  are connected electrically with each other so that electric signal or direct current can be supplied through the cases  117 ,  127 . 
   In the meantime, when direct current is supplied or electric signal is supplied through the cases  117 ,  127 , two passages need to be formed in the cases  117 ,  127 . 
     FIGS. 3 ,  4  show an example in which two passages are formed in the case  117  and  FIG. 3  is a schematic diagram showing a condition in which the case  117  is constructed of two members, a first case  117   a  and a second case  117   b  and  FIG. 4  is a schematic diagram showing a condition in which insulating portion  117   c  is formed in the case  117 . By forming the two passages in the case  117  in accordance therewith, power feeding, supply of electric signal and data communication are easily carried out by bringing the case  117  and the case  127  into a physical contact with each other. 
   Although  FIGS. 3 ,  4  show only the case  117  constituting the first connector  11 , the case  127  constituting the second connector  12  may adopt the same structure. 
   When the cases  117 ,  127  constituting the first connector  11  and the second connector  12  are constructed in double structures so as to bring their inside cases and outside cases into contact with each other, two passages can be formed. The structures of the cases  117 ,  127  described above may be applied to respective embodiments described as well as this embodiment. 
   (D) Effect of the First Embodiment 
   In the optical connector  1  of the first embodiment, the optical transmitter module  111  and the optical receiver module  121  are disposed in the cases  117 ,  127  such that they are opposed to each other so as to transmit information by spatial optical transmitting. Therefore, no connection failure due to damage of wiring occurs or the durability to connection/disconnecting is secured semi-permanently and by adopting optical transmitting as a transmitting means of data information, acceleration of transmitting and higher capacity transmitting can be achieved. 
   Because such optical transmitting is carried out inside the case, cross talk can be suppressed and eye safety can be achieved, thereby providing a reliable and high safety optical connector. 
   (II) Second Embodiment 
   The optical connector  2  according to the second embodiment of the present invention will be described with reference to  FIG. 5 . The optical connector  1  of the first embodiment includes the optical transmitter module  111  in the first connector  11  and the optical receiver module  121  in the second connector  12  so as to execute spatial optical transmitting in a single direction. 
   Contrary to this, the optical connector  2  of the embodiment includes two optical transmitter modules  111   a ,  111   b  in the first connector  11  and two optical receiver modules  121   a ,  121   b  corresponding to the optical transmitter modules  111   a ,  111   b  in the second connector  12  so as to execute plural spatial optical transmitting in a single direction (single direction multiple optical transmitting). 
     FIG. 5  is a schematic view showing the structure of interior of the case of the optical connector  2  according to the second embodiment. The optical connector  2  of this embodiment includes the two optical transmitter modules  111   a ,  111   b  disposed in the first connector  11  and the two optical receiver modules  121   a ,  121   b  disposed in the second connector  12  such that they are opposed to each other across space. 
   In the first connector  11 , the optical transmitter module  111   a  and the optical transmitter module  111   b  are disposed in parallel and in the second connector  12 , the optical receiver module  121   a  and the optical receiver module  121   b  are disposed in parallel. A light shielding body  8  is disposed so as to shield the optical transmitter module  111   a  in the first connector  11  and the light receiver module  121   a  in the second connector  12  from the optical transmitter module  111   b  in the first connector  11  and the optical receiver module  121   b  in the second connector  12 . The arrangement of this light shielding body  8  separates passages of optical signals sent from the two optical transmitter modules  111   a ,  111   b  in the first connector  11 , so that the two optical signals do not interfere thereby the optical transmitting being executed effectively. 
   Referring to  FIG. 5 , the light shielding body  8  includes a first light shielding body  81  disposed in the first connector  11  and a second light shielding body  82  disposed in the second connector  12  and when the both connectors  11 ,  12  are connected, the front end of the first light shielding body  81  and the front end of the second light shielding body  82  abut each other. 
   Because the first connector  11  and the second connector  12  are electrically connected with the light shielding body  8  if the light shielding body  8  is formed of conductive material, two passages are formed with the light shielding body  8  and the cases  117 ,  127 . Even unless the two passages are formed especially by adopting the structure shown in  FIG. 3 , thereby it is possible to execute power feeding and transmitting of electric signal between the both connectors (data communication). 
   If the wavelength of optical signals emitted from the two optical transmitter modules  111   a ,  111   b  of the first connector  11  are set different and the optical receiver modules  121   a ,  121   b  of the second connector  12  are equipped with a wavelength selecting filter respectively which allows only the wavelength of optical signal emitted from corresponding optical transmitter module to pass through or the light receiving element of the optical receiver module is equipped with distributed bragg reflector (DBR), optical signals do not interfere with each other even if the light shielding body  8  shown in  FIG. 5  is not formed. If the wavelength of the optical signals emitted form the two optical transmitter modules  111   a ,  111   b  are set different likewise, the light receiving elements  122  disposed at the optical receiver modules  121   a ,  121   b  may be formed of materials having different band gap so as to receive by selecting only the wavelength of the optical signal emitted from a corresponding optical transmitter module. As a consequence, the wavelength multiplex optical transmitting can be carried out effectively without disposing the light shielding body  8  described previously. The same thing can be said in case of wavelength multiplexing in the same direction and wavelength multiplexing in bi-directions in the following embodiments. 
   The optical connector  2  of the second embodiment can execute plural optical transmitting in a single direction so as to accelerate transmitting of information by adopting the structure of disposing the optical transmitter modules  111   a ,  111   b  in the first connector  11  and the optical receiver modules  121   a ,  121   b  in the second connector  12 . 
   (III) Third Embodiment 
   The optical connector  3  according to the third embodiment of the present invention will be described with reference to  FIG. 6 . The optical connector  3  of this embodiment includes an optical transmitter module  111   c  and an optical receiver module  121   d  in the first connector  11  and an optical transmitter module  111   d  and an optical receiver module  121   c  in the second connector  12  so as to transmit optical signals in spatial bi-directions. 
   Like reference numerals are attached to the same or substantially the same components as described previously in a following description and explanation of those components is not described. 
     FIG. 6  is a schematic view showing the structure of interior of the case of the optical connector  3  of the third embodiment. In the optical connector  3  of this embodiment, the optical transmitter module  111   c  disposed in the first connector  11  and the optical receiver module  121   c  disposed in the second connector  12  are opposed to each other across space inside the connector and the optical transmitter module  111   d  disposed in the second connector  12  are opposed to the optical receiver module  121   d  disposed in the first connector  11  across space. 
   The optical connector  3  having such a structure includes two pairs of the optical transmitter modules and the optical receiver modules (optical transmitter module  111   c /optical receiver module  121   c , and optical transmitter module  111   d /optical receiver module  121   d ). As a consequence, bi-directional optical transmitting is enabled and if the device connecting portion  113  of the first connector  11  is connected to an USB memory (not shown) which is a peripheral device and the device connecting portion  123  of the second connector  12  is connected to a personal computer (not shown), low-speed and high-speed data communication can be executed between the USB memory and the personal computer in bi-directions. 
   More specifically, the optical connector  3  having the structure shown in  FIG. 6  executes spatial optical transmitting in a single direction from the optical transmitter module  111   c  to the optical receiver module  121   c  between the optical transmitter module  111   c  disposed in the first connector  11  and the optical receiver module  121   c  disposed in the second connector  12 . In the optical transmitter module  111   d  provided in the second connector  12 , electric signal (data signal) output-from a personal computer (not shown) is received by a terminal formed inside the device connecting portion  123  of the second connector  12  and supplied to a driver (not shown). The driver drives the light emitting element  112   d  using this input electric signal and the driven light emitting element  112   d  converts the data signal to optical signal for optical transmitting and emits the light to the optical receiver module  121   d  opposing across space through the lens  124 . The light receiving element  122   d  of the optical receiver module  121   d  receives optical signal from the light emitting element  112   d  of the optical transmitter module  111   d  through a lens  114  and converts the received optical signal to electric signal. This electric signal is output to a terminal (not shown) of the device connecting portion  113  formed at the other end of the first connector  11  and transmitted to a personal computer (not shown) connected to the device connecting portion  113  so that bi-directional spatial optical transmitting can be executed between the USB memory and the personal computer. 
   According to this embodiment, the optical transmitter modules  111   c ,  111   d  and the optical receiver modules  121   c ,  121   d  are disposed laterally in parallel in the respective connectors  11 ,  12 . The light shielding bodies  8  are disposed so as to shield the optical transmitter module  111   c  of the first connector  11  and the optical receiver module  121   c  of the second connector  12  from the optical transmitter module  111   d  of the second connector  12  and the optical receiver module  121   d  of the first connector  11 . As a consequence, a passage of an optical signal emitted from the optical transmitter module  111   c  of the first connector  11  and the a passage of an optical signal emitted from the optical transmitter module  111   d  of the second connector  12  are separated from each other so that even if the wavelengths of the two optical signals are equal, these optical signals do not interfere. 
   Because the optical connector  3  of the third embodiment adopts a structure in which the optical transmitter modules  111   c ,  111   d  and the optical receiver modules  121   c ,  121   d  are disposed in the first connector  11  and the second connector  12 , bi-directional optical transmitting can be executed so as to diversify the information transmitting. 
   (IV) Fourth Embodiment 
   The optical connector  4  according to the fourth embodiment of the present invention will be described with reference to  FIG. 7 . 
   The optical connector described in the third embodiment includes the optical transmitter module  111   c  and the optical receiver module  121   d  in the first connector  11  and the optical transmitter module  111   d  and the optical receiver module  121   c  in the second connector  12  so as to execute bi-directional spatial optical transmitting. 
   The optical connector  4  of this embodiment is different from the optical connector  3  of the third embodiment in that an optical transmitter module  115  which supplies electricity for power feeding is additionally disposed inside the first connector  11  and an optical receiver module  125  which is supplied with electricity for power feeding in the form of light corresponding to the optical transmitter module  115  is disposed inside the second connector  12 . 
   In a following description, description of the same or substantially the same components as described previously is not repeated with same reference numerals attached thereto. 
     FIG. 7  is a schematic view showing the structure of interior of the case of the optical connector  4  according to the fourth embodiment. The optical connector  4  of this embodiment includes the optical transmitter module  115  and the optical receiver module  125  for power feeding as well as the optical transmitter modules  111   c ,  111   d  and the optical receiver modules  121   c ,  121   d  for the bi-directional optical transmitting. 
   The optical transmitter modules  111   c ,  111   d  for data communication and the optical transmitter module  115  for power feeding disposed in the optical connector  4  can select their functions by differentiating the wavelength ranges of optical signals to be transmitted and for example, can select appropriate functions if the wavelength range of the former is set in a range of 0.3 μm to 0.7 μm and the wavelength range of the latter is set in a range of 0.8 μm-1.0 μm. 
   If the optical transmitter module  115  and the optical receiver module  125  for power feeding are disposed inside the connector as described in this embodiment, electric signal for power feeding sent from a personal computer connected to the first connector  11  is converted to optical signal for optical transmitting by the optical transmitter module  115  for power feeding of the first connector  11  and light is emitted from the light emitting element  116  for power feeding to the optical receiver module  125  for power feeding disposed opposing the light emitting element  116  for power feeding across space through the lens  114 . This optical signal is received by the light receiving element  126  of the optical receiver module  125  through the lens  124  and the received optical signal is converted to electric signal and after that, sent to the USB connector connected to the second connector  12 . 
   Because the bi-directional optical transmitting by the optical transmitter module  111   c  and the optical receiver module  121   c  and the optical transmitter module  111   d  and the optical receiver module  121   d  is the same as that of the third embodiment described previously, explanation thereof is described. 
   The optical connector  4  of the fourth embodiment can execute the bi-directional optical transmitting like the third embodiment so as to diversify the information transmitting. Additionally, electricity can be transmitted by optical transmitting as well as information by disposing the optical transmitter module  115  and the optical receiver module  125  for power feeding. 
   (V) Fifth Embodiment 
   The optical connector  5  according to the fifth embodiment of the present invention will be described with reference to  FIG. 8 . The third embodiment indicates an example that the optical transmitter modules  111   c ,  111   d  and the optical receiver modules  121   c ,  121   d  are used as a medium for the bi-directional optical transmitting. The optical connector  5  of this embodiment executes bi-directional spatial optical transmitting by disposing optical transmitter/receiver modules  119 ,  129  in the first connector  11  and the second connector  12 . 
   In a following description, explanation of the same or substantially the same components as described previously is not described with same reference numerals attached thereto. 
     FIG. 8  is a schematic view showing the structure of interior of the case of the optical connector  5  of the fifth embodiment. 
   The optical transmitter/receiver module  119  disposed in the first connector  11  shown in  FIG. 8  includes a light emitting element  1191  as a light transmitting portion which converts input electric signal to optical signal and sends it to the second connector  12  and a light receiving element  1192  as a light receiving portion which receives optical signal from the second connector  12  having a different wavelength from this light emitting element  1191 , converts to electric signal and outputs and additionally, a wavelength selecting filter  1193 . This wavelength selecting filter  1193  has a function of directing an optical signal from the light emitting element  1291  described later of the second connector  12  to the light receiving element  1192  and then directing an optical signal from the light emitting element  1191  to a light receiving element  1292  (described later) of the second connector  12 . 
   Likewise, the optical transmitter/receiver module  129  disposed in the second connector  12  includes a light receiving element  1292  as a light receiving portion which converts optical signal from the light emitting element  1191  of the first connector  11  and outputs and a light emitting element  1291  as a light transmitting portion which converts input electric signal to optical signal and transmits to the light receiving element  1192  of the first connector  11  and additionally a wavelength selecting filter  1293 . This wavelength selecting filter  1293  has a function of directing an optical signal from the light emitting element  1191  of the first connector  11  to the light receiving element  1292  of the second connector and further directing an optical signal from the light emitting element  1291  of the second connector  12  to the light receiving element  1192  of the first connector  11 . 
   The wavelength selecting filters  1193 ,  1293  disposed in the optical transmitter/receiver modules  119 ,  129  and capable of passing a certain wavelength light selectively and reflecting a certain wavelength light selectively enables the light receiving element to receive an optical signal having a specified wavelength when a light emitting element and a light receiving element are provided in a single module and the light emitting element to transmit an optical signal having a wavelength different from the optical signal received by the light receiving element, so that a following function is exerted. According to this embodiment, the wavelength selecting filter  1193  in the first connector  11  allows an optical signal (wavelength is assumed to be λ 1 ) from the light emitting element  1291  of the second connector  12  to pass, directs it to the light receiving element  1192 , and reflects an optical signal (wavelength is assumed to be λ 2 ) from the light emitting element  1191  toward the light receiving element  1292  of the second connector. The wavelength selecting filter  1293  in the second connector  12  allows an optical signal from the light emitting element  1191  of the first connector  11  having the wavelength λ 2  to pass and directs it to the light receiving element  1292  and at the same time, reflects an optical signal from the light emitting element  1291  of the second connector  12  having the wavelength λ 1  and directs to the light receiving element  1192  of the first connector  11 . As a consequence, the light transmitter/receiver modules  119 ,  129  have functions of executing optical transmitting and optical receiving with this single module. 
   In the optical connector  5  of this embodiment, an optical signal emitted from the light emitting element  1191  of the optical transmitter/receiver module  119  disposed in the first connector  11  can be received by the light receiving element  1292  of the optical transmitter/receiver module  129  disposed in the second connector  12  and an optical signal emitted from the light emitting element  1291  of the optical transmitter/receiver module  129  can be received by the light receiving element  1192  of the optical transmitter/receiver module  119  disposed in the first connector  11  so as to execute simultaneous bi-directional optical transmitting. As a consequence, diversification of information transmitting can be achieved and transmitting and receiving of optical signal can be executed with a pair of the optical transmitter/receiver modules  119 ,  129 . Thus, reduction of the quantity of necessary components and reduction of necessary space can be achieved if comparing with the optical connector of the third embodiment which is executed by the optical transmitter module and the optical receiver module and as a consequence, reduction in the size of the optical connector can be achieved preferably. 
   The above-described aspects indicate aspects of the present invention and the present invention is not restricted to the above-described embodiment. Needless to say, modification and improvement within a range which the object and effect of the present invention can be achieved as well as the structure of the invention are included in the content of the present invention. Further, the structure, shape and the like for executing the present invention may be changed to other structure, shape and the like within a range which the object and effect of the invention can be achieved. 
   Although the above-described embodiments pick up an example of transmitting an optical signal of a kind with an optical transmitter module (or optical transmitter/receiver module), the optical connector of the present invention may adopt optical transmitter module for transmitting plural optical signals with a single optical transmitter module. 
     FIG. 9  is a diagram showing other aspect of the optical connector of the present invention or a schematic diagram showing the structure of interior of the case of an optical connector  6  which adopts optical transmitter module  131  capable of transmitting two optical signals. 
   The optical transmitter module  131  disposed in the first connector  11  of the optical connector  6  includes two light emitting elements  1311 ,  1312  and further a wavelength selecting filter  1313 . In the meantime, an optical receiver module  132  disposed in the second connector  12  includes two corresponding light receiving elements  1321 ,  1322  and further a wavelength selecting filter  1323 . 
   The wavelength selecting filter  1313  disposed in the optical transmitter module  131  reflects optical signal having a wavelength (for example, λ 1 ) sent from the light emitting element  1311  and allows optical signal sent having a wavelength (for example, λ 2 ) from the light emitting element  1312  to pass through selectively. As a consequence, two kinds of the optical signals are transmitted to the optical receiver module  132  of the second connector  12  at the same time through the lens  114 . 
   On the other hand, in the optical receiver module  132  of the second connector  12 , optical signal having wavelength λ 1  sent through the lens  124  is selectively reflected by the wavelength selecting filter  1323  and received by the light receiving element  1321  and optical signal having the wavelength λ 2  is allowed to pass through selectively by the wavelength selecting filter  1323  and received by the light receiving element  1322 . Two kinds of optical signals can be transmitted in a single direction at the same time so as to achieve higher speed transmitting and high capacity transmitting of information. 
   (VI) Sixth Embodiment 
   An optical connector  7  of the sixth embodiment of the present invention will be described with reference to  FIG. 10 . 
   The optical connector  7  of this embodiment includes an optical transmitter module  111   c  and an optical receiver module  121   d  in the first connector  11  and an optical transmitter module  111   d  and an optical receiver module  121   c  in the second connector  12  and interference of each other is blocked by surrounding an optical communication section with the case so as to achieve bi-directional multiplexed spatial optical transmitting. 
     FIG. 10  is a schematic view showing the structure of interior of the case of the optical connector  7  of the sixth embodiment. In the optical connector  7  of this embodiment, the optical transmitter module  111   c  disposed in the first connector  11  and the optical receiver module  121   c  disposed in the second connector  12  are opposed to each other across space inside the connector and the optical transmitter module  111   d  disposed in the second connector  12  and the optical receiver module  121   d  disposed in the first connector  11  are opposed to each other across space inside connector. Light shielding bodies  81  to  84  are used to separate optical signals. 
   Because the optical connector  7  having such a structure includes two pairs of the optical transmitter modules and optical receiver modules (optical transmitter module  111   c /optical receiver module  121   c , and optical transmitter module  111   d /optical receiver module  121   d ), the bi-directional optical transmitting is enabled, so that low-speed or high-speed data communication can be executed between the USB memory and personal computer bi-directionally by connecting the device connecting portion  113  of the first connector  11  to the USB memory (USB memory) as a peripheral device and the personal computer (not shown) to the device connecting portion  123  of the second connector  12 . 
   This embodiment allows corresponding optical transmitter module and optical receiver module to be connected to each other properly by combining the size or shape of the first light shielding body  81  and the second light shielding body  82  with the size or shape of the third light shielding body  83  and the fourth light shielding body  84  because the optical transmitter modules or the optical receiver modules cannot be fitted to each other properly.  FIG. 10  adopts such a structure in which the sizes of the first light shielding body  81  and the second light shielding body  82  are different from the sizes of the third light shielding body  83  and the fourth light shielding body  84 . 
   The function of power feeding can be added by using the connection between the first light shielding body  81  and the second light shielding body  82  and the connection between the third light shielding body  83  and the fourth light shielding body  84 . Constructing each light shielding body of conductive material enables electricity to be supplied with a pair of the light shielding bodies. In this case, combining the case  117  and the case  127  with different sizes or shapes prevents electrodes of the same kind of potential from making contact with each other. In the example shown in  FIG. 10 , the case  127  is constructed in a slightly larger structure than the case  117  so that the case  117  can invade into the inside of the case  127 . The second to fourth embodiments can apply the same structure. 
   Because the optical connector of the sixth embodiment is so constructed that the optical transmitter modules  111   c ,  111   d  and the optical receiver modules  121   c ,  121   d  are disposed in the first connector  11  and the second connector  12 , bi-directional optical transmitting can be executed, thereby it is possible to achieve diversification of information transmitting. 
   The specific structure, shape and the like of the embodiment of the present invention may be changed to other structure, shape and the like within a range which enables the object of the present invention to be achieved. 
   INDUSTRIAL APPLICABILITY 
   The present invention can be used advantageously as an optical connector which connects an electronic apparatus such as a personal computer to peripherals such as a mouse, printer, keyboard, digital still camera, digital video camera and so on in order to exchange information between such devices.