JP2003218803A - Shaped optical and electrical transmission device, optical transmission device and electronic device using the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To realize shutdown control for power saving while suppressing an increase in the chip area of an optical receiving circuit 11 in a shared optical and electrical transmission device 21 that constitutes an optical fiber link and that converts a received optical signal to an electric signal. <P>SOLUTION: A shutdown circuit is incorporated in a chip of the optical receiving circuit 11 which is provided with a photodiode and its signal processing circuit or the like. A logic circuit 41, which decides whether a plug PL3 to a jack part and the kind of the plug from potentials V1 to V3 or the like, and which outputs a shutdown signal SD to the chip of the optical receiving circuit 11, is provided. Therefore, the shutdown control for power saving can be realized while suppressing the increase in the chip area of the optical receiving circuit 11. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optoelectronic shared transmission device and an optical transmission device used for forming an optical fiber link for converting an electric signal into an optical digital signal and transmitting the optical digital signal, and an electronic device using them. .

[0002]

2. Description of the Related Art The above-mentioned optical fiber link converts an electric signal into an optical signal on the transmitting side and transmits the optical signal, and a receiving side reconverts the received optical signal into an electric signal. Since signals of a plurality of channels can be easily transmitted at a high speed by using one optical fiber, they have been widely used in general households in recent years with the spread of digital devices equipped with an optical transceiver circuit. For example, signal transmission from a DVD (digital video disc) player, STB (set top box) and CD (compact disc) player for digital broadcasting to an MD (mini disc) player, an amplifier and the like. In addition, recently, the transmission of music signals to personal portable devices such as personal computers has become widespread. Furthermore, the optical fiber link is also used for signal transmission in a place where electrical insulation is required.

FIG. 19 is a sectional view showing the structure of a typical optical / electrical transmission device 70 of a typical prior art. This optical / electrical transmission device 70 is proposed in Japanese Patent Laid-Open No. 6-140106. This optical / electrical shared transmission device 70 roughly includes an optical semiconductor element 71 that transmits and receives an optical signal when an optical fiber cable is used as a transmission medium, and an end of the electric cable when an electric cable is used as a transmission medium. A plurality of electrical connection terminals 72 for transmitting and receiving an electrical signal by contacting a small single-headed electrical plug for electrical transmission connected to the section
And a holder 73 for accommodating and holding the optical semiconductor element 71 and the electrical connection terminal 72. An external connector 74 for connecting the optical semiconductor element 71 and / or the electrical connection terminal 72 to an external circuit is arranged on the outer peripheral surface of the holder 73.

As shown by reference numeral 76, an electric plug or an optical fiber plug formed in a similar shape to the electric plug is selected in a common insertion hole 75 formed from one end surface of the cylindrical holder 73. By fitting the single head to the position corresponding to the constriction, the shared optical / electrical transmission device 70 can be used for both optical signal transmission and electric signal transmission. The length of the insertion portion of the optical fiber plug of the plugs inserted in the insertion hole 75 is shorter than the depth of the insertion hole and longer than the length of the insertion portion of the electric plug. The end face of the single head is arranged to be close to the optical semiconductor element 71. further,
Although omitted in FIG. 19, the plug 76 inserted into the insertion hole 75 of the holder 73 is provided with a type detection means for identifying whether the transmission method is an optical method or an electrical method, and the plug 76 has an insertion hole. Insertion presence / absence detection means for identifying whether or not it has been inserted into 75 is provided.

FIG. 20 is a sectional view showing the structure of another prior art shared optical / electrical transmission device 80. This shared optical / electrical transmission device 80 is proposed in JP-A-6-111876. Similar to the above-described optical / electrical common transmission device 70, the optical / electrical common transmission device 80 also contacts the attached electrical signal plug to transmit / receive an electrical signal.
1 and an optical element 82 for transmitting / receiving an optical signal facing the signal transmitting / receiving surface formed on the tip end surface of the attached optical signal plug.
And are integrally housed in the holding body 83.

In addition to these, Japanese Patent Laid-Open No. 2000-285996, Japanese Patent Laid-Open No. 11-109189, and Japanese Utility Model Publication No. 62-1
93208, JP-A-57-198419,
Japanese Laid-Open Patent Publication No. 56-17645, Japanese Utility Model Laid-Open No. 61-5370.
No. 6 and Japanese Utility Model Application Laid-Open No. 64-12387 disclose examples having the same basic technique. Also,
The prior art of Japanese Unexamined Patent Publication No. 6-140106 discloses an example of an optical transmission device using a rectangular plug / jack. Further, in Japanese Unexamined Patent Publication No. 58-111008, an optical fiber and A composite cord and a corresponding plug / jack that combine an electric power supply line for supplying power to the transmission / reception module are shown.

[0007]

However, in any of the above-mentioned conventional techniques, when the power of the device is turned on, power is supplied to the optical semiconductor element, and when the electric plug is attached. Also, when neither the electrical plug nor the optical plug is attached, the optical semiconductor element remains powered. However, in Japanese Patent Laid-Open No. 58-111008, power is not supplied unless the composite code is connected. However, the transmitting / receiving module on the power supply side supplies power to itself and also to the composite code. Power will always be supplied.

On the other hand, in recent years, the transmission / reception module including the jack and the transmission / reception circuit has been reduced in size, and has been increasingly mounted on a portable device. In such a portable device, there is a strong demand for reduction of power consumption that affects the battery drive time, and unnecessary power consumption by the optical semiconductor element becomes a problem. Therefore, in order to perform shutdown control that shuts off the power supply to the optical semiconductor element, it is necessary to add an external circuit such as a regulator, which increases the number of parts, the number of assembly steps, the cost, and the board space. There is a problem that

Furthermore, if power is supplied to the optical semiconductor element even though the plug is not attached, there is a problem that light leakage enters the eyes of the user and adversely affects it.

An object of the present invention is to provide an optical-electrical shared transmission apparatus, an optical transmission apparatus, and an electronic apparatus using the same, which can perform shutdown control for power saving while suppressing an increase in the chip area of a circuit section. That is.

[0011]

An optical / electrical common transmission device of the present invention comprises a circuit section on which an opto-electrical conversion element is mounted and an optical / electrical common jack section, and is attached to an end of a transmission medium to provide an optical signal. A plug having a similar shape between a signal and an electric signal is fitted in the common-use photoelectric jack, so that either the optical signal or the electric signal can be transmitted through the optical or electric transmission medium. In the optical-electrical shared transmission device that can also perform transmission of, in the circuit unit, a shutdown circuit is mounted together with the optical-electrical conversion element and a signal processing circuit related to the optical-electrical conversion element, and the shutdown circuit, The power supply to the photoelectric conversion element and the signal processing circuit is shut off in response to a shutdown signal input from the outside to the shutdown terminal.

According to the above structure, a plug jack having a shape similar to the stereo mini-plug jack is used for transmission of an electric signal transmission device realized by a so-called stereo mini-plug jack for audio. In an optical / electrical common transmission device capable of transmitting an optical signal by using an optical fiber as a medium, an opto-electric conversion element such as a photodiode or a light emitting diode and the opto-electric conversion such as a light receiving amplifier circuit or a drive circuit. In the circuit portion where the signal processing circuit related to the element is mounted,
Furthermore, a shutdown circuit is mounted on the same chip.

Then, in response to a shutdown signal input to a shutdown terminal from an external control circuit or the like in response to a state of a contact of a plug attached to the jack or a user operation, the photoelectric conversion element and the signal are transmitted. Power off the processing circuit.

Therefore, it is possible to perform the shutdown control for power saving without substantially increasing the chip area of the circuit part as well as the photoelectric sharing of the plug and jack.

Further, in the optical / electrical common transmission device of the present invention, in response to the detection results of the plug insertion / non-insertion detecting means and the plug type detecting means provided in the photoelectric common jack section, the control circuit provided outside is It is characterized in that the necessity of shutdown is determined and the shutdown signal is output to the shutdown terminal.

According to the above configuration, the control circuit can appropriately perform the shutdown control of the opto-electric conversion element and the signal processing circuit according to the presence / absence of the plug insertion and the plug type. That is, the power is supplied only when the plug is inserted and it is an optical plug, and the power supply is cut off when the plug is not inserted and when it is an electric plug even if it is inserted.

Furthermore, in the optical / electrical common transmission device of the present invention, the optical / electrical common jack section is provided with plug insertion presence / absence detection means and plug type detection means, and the circuit section has the insertion presence / absence detection means. And in response to the detection result of the type detection means, it is determined whether the shutdown is necessary,
An internal determination circuit that outputs the shutdown signal is provided to the shutdown terminal.

According to the above arrangement, the internal determination circuit can appropriately perform the shutdown control of the photoelectric conversion element and the signal processing circuit in accordance with the presence / absence of the plug insertion and the plug type. . That is,
Power is supplied only when the plug is inserted and it is an optical plug, and the power supply is cut off when the plug is not inserted and when it is an electric plug even if it is inserted. Further, since the control is performed by a simple logic process inside, there is no software burden on an external microcomputer or the like.

Further, in the optical / electrical common transmission device of the present invention, an externally provided control circuit determines whether or not shutdown is required in response to an external key operation, and outputs the shutdown signal to the shutdown terminal. Characterize.

According to the above arrangement, the shutdown control can be performed in detail in response to an external operation such that the power is supplied only at the time of recording and the power is shut off at the time of other reproduction.

Furthermore, the optical transmission device of the present invention is an optical transmission device.
The optical signal is transmitted through the optical fiber by including a circuit section on which the electric conversion element is mounted and a jack section, and a plug attached to the end of the optical fiber is fitted to the jack section. In the optical transmission device capable of performing the above, in the circuit unit, a shutdown circuit is mounted together with the optical-electrical conversion element and a signal processing circuit related to the optical-electrical conversion element, and the shutdown circuit shuts down from the outside. Power to the photoelectric conversion element and the signal processing circuit is cut off in response to a shutdown signal input to the terminal.

According to the above structure, in the optical transmission device for transmitting the optical signal by using the optical fiber as the transmission medium, the photoelectric conversion element such as the photodiode and the light emitting diode and the light receiving amplifier circuit, A shutdown circuit is further mounted in the same chip in the circuit section in which a signal processing circuit related to the photoelectric conversion element such as a drive circuit is mounted.

Then, in response to a shutdown signal input to a shutdown terminal from an external control circuit or the like according to the presence / absence of attachment of a plug to the jack, user operation, etc., the photoelectric conversion element and the signal processing circuit are provided. Turn off the power of.

Therefore, the shutdown control for power saving can be performed without increasing the chip area of the circuit portion.

Further, in the optical transmission device of the present invention, a control circuit provided outside determines whether or not shutdown is required in response to an external key operation, and outputs the shutdown signal to the shutdown terminal. And

According to the above configuration, the shutdown control can be performed in detail in response to an external operation such that the power is supplied only during recording and the power is cut off during other reproduction.

Further, in the optical transmission device of the present invention, when the plug is fitted into the jack portion, the second transmission member comes into contact with a predetermined first metal terminal provided on the plug.
An internal determination circuit that determines whether or not shutdown is necessary and outputs the shutdown signal to the shutdown terminal in response to the detection result of the second metal terminal. It is characterized by being.

According to the above configuration, the internal determination circuit can appropriately perform the shutdown control of the photoelectric conversion element and the signal processing circuit depending on whether the plug is inserted or not. That is, the power supply is performed only when the plug is inserted, and the power supply is shut off when the plug is not inserted. Further, since the control is performed by a simple logic process inside, there is no software burden on an external microcomputer or the like.

Also, in the optical transmission device of the present invention, a shutter and a switch that opens and closes in conjunction with opening and closing of the shutter are provided at the insertion port of the jack section, and the circuit section detects the switch. In response to the result, an internal determination circuit for determining whether or not the shutdown is necessary and outputting the shutdown signal to the shutdown terminal is provided.

According to the above construction, the shutter is provided at the insertion opening of the jack portion, and the switch is opened / closed in conjunction with opening / closing of the shutter by, for example, making the shutter conductive and the inner wall of the jack conductive. Formed,
When the shutter opens and closes depending on whether the plug is inserted or not,
From the switching state of the switch interlocked with it, the internal determination circuit can appropriately perform shutdown control of the photoelectric conversion element and the signal processing circuit. That is, the power supply is performed only when the plug is inserted, and the power supply is shut off when the plug is not inserted. Further, since the control is performed by a simple logic process inside, there is no software burden on an external microcomputer or the like. Furthermore, it is not necessary to provide the plug with a dedicated metal terminal for mounting detection.

Furthermore, the electronic equipment of the present invention is characterized by using the above-mentioned optical-electrical shared transmission device or optical transmission device.

[0032]

BEST MODE FOR CARRYING OUT THE INVENTION Regarding one embodiment of the present invention,
The following is a description based on FIGS. 1 to 11.

FIG. 1 is a block diagram showing an electrical configuration of an optical receiver circuit 11 which realizes an optical / electrical transmission device or an optical transmission device according to an embodiment of the present invention. This optical receiver circuit 1
1 is monolithically formed on one chip including the photodiode PD. The light receiving circuit 11 generally includes the photodiode PD, a dummy capacitor CD, and
First stage amplifiers A11, A12 and differential amplifiers A2, A3
, Comparator CMP, buffer B, and output circuit 1
2, a bias circuit 13, and a shutdown circuit 14.

The photodiode PD is biased by the corresponding first-stage amplifier A11, and the current corresponding to the optical signal received from the photodiode PD is converted into a voltage by the resistor R11 of the first-stage amplifier A11. Output with low impedance. Further, the dummy capacitance CD is formed to be equal to the parasitic capacitance of the photodiode PD, and the current flowing through the dummy capacitance CD is converted into a voltage by a first stage amplifier A12 and a resistor R12 having the same configuration as the first stage amplifier A11, and a low voltage. It is output as impedance.

The outputs from the first-stage amplifiers A11 and A12 are
It is given to each input of the differential amplifier A2 which is AC-coupled by the coupling capacitors C1 and C2. The reference voltage Vref is also applied to the respective inputs of the differential amplifier A2 via pull-up resistors R21 and R22. Therefore, each input of the differential amplifier A2 becomes a value obtained by superposing the AC components of the outputs from the first-stage amplifiers A11 and A12 with the reference voltage Vref as the center, and the differential amplifier A2 receives those inputs. The difference is amplified and output as a differential voltage signal. Here, the noise from the GND potential through the photodiode PD, which appears in the output from the first-stage amplifier A11, also appears in the same phase in the output from the first-stage amplifier A12, and therefore this differential amplifier A2
Outputs a signal from which the noise has been removed.

The output from the differential amplifier A2 is further amplified by the differential amplifier A3, and the differential voltage signals of the output are compared with each other by the comparator CMP and shaped into a differential rectangular signal. The differential output from the comparator CMP is converted into a single output in the buffer B and input to the output circuit 12.

The output circuit 12 has a power input terminal P11.
Is a push-pull amplifier having a CMOS configuration, which is composed of a PMOS transistor QP and an NMOS transistor QN, and which uses the power supply voltage Vcc input to the input terminal and the GND potential applied to the ground terminal P12 as power supplies, and the output Vout to the output terminal P13 is Invert the output from buffer B,
Further, it becomes either the power supply voltage Vcc or the GND potential.

Power is supplied from the bias circuit 13 to the first-stage amplifiers A11 and A12, the differential amplifiers A2 and A3, the comparator CMP and the buffer B. Whether or not the bias circuit 13 supplies power is controlled by the shutdown circuit 14 in response to a shutdown signal externally input to the shutdown input terminal P14.

FIG. 2 is a block diagram showing a specific configuration of the bias circuit 13 and the shutdown circuit 14 in the optical receiving circuit 11 configured as described above.
Parts corresponding to those in FIG. 1 are designated by the same reference numerals. The bias circuit 13 includes the first-stage amplifiers A11 and A1.
2 and PMOS transistors Q11 and Q12 for controlling whether or not to supply the power supply voltage Vcc to
P for commonly controlling the MOS transistors Q11 and Q12
MOS transistor Q10 and the differential amplifiers A2 and A
3. Comparator CMP and buffer B are set to G
N for controlling whether or not to supply power by connecting to ND potential
N for commonly controlling the MOS transistors Q2, Q3, Q4, Q5 and those NMOS transistors Q2 to Q5
And a MOS transistor Q0.

The PMOS transistors Q11 and Q12
Are connected to the high-level power supply inputs of the first-stage amplifiers A11 and A12, the sources are commonly supplied with the power supply voltage Vcc, and the gates are commonly connected to the drain of the PMOS transistor Q10. The power supply voltage Vcc is applied to the source of the PMOS transistor Q10,
Of the two stages of inverters INV1 and INV2 forming the shutdown circuit 14, the output of the preceding stage inverter INV1 is applied to the gate. A low-level bias PBIAS is also applied to the drain of the PMOS transistor Q10, that is, the gates of the PMOS transistors Q11 and Q12 via a pull-down resistor (not shown).
Is given. The low-level power supply inputs of the first-stage amplifiers A11 and A12 are both connected to the GND potential (not shown).

The NMOS transistors Q2, Q3, Q
The drains of Q4 and Q5 are respectively connected to the low-level power supply inputs of the differential amplifiers A2 and A3, the comparator CMP and the buffer B, the sources are commonly connected to the GND potential, and the gates are commonly connected to the drain of the NMOS transistor Q0. Connected. The source of the NMOS transistor Q0 is connected to the GND potential, and the output of the inverter INV2 on the subsequent stage side of the shutdown circuit 14 is given to the gate. A high level bias NBIAS is also applied to the drain of the NMOS transistor Q0, that is, the gates of the NMOS transistors Q2, Q3, Q4, and Q5 via a pull-up resistor (not shown). A power supply voltage Vcc is applied to the high-level-side power supply inputs of the differential amplifiers A2 and A3, the comparator CMP, and the buffer B (not shown).

Therefore, while the shutdown signal is low level, the output of the inverter INV1 is high level and the PMOS transistor Q10 is off.
As a result, the PMOS transistors Q11 and Q12
Is biased to a low level, the PMOS transistors Q11 and Q12 are turned on, and the first stage amplifier A11,
A desired constant current is supplied to A12. Similarly, when the shutdown signal is low level, the inverter I
The output of NV2 becomes low level and the NMOS transistor Q0 is turned off, whereby the gates of the NMOS transistors Q2 to Q5 are biased to high level and the N
The MOS transistors Q2 to Q5 are turned on, and the differential amplifier A
A desired constant current is supplied to 2, A3, the comparator CMP and the buffer B.

On the other hand, when the shutdown signal goes high, the output of the inverter INV1 goes low, turning on the PMOS transistor Q10.
As a result, the gates of the PMOS transistors Q11 and Q12 become high level, and the PMOS transistor Q1
1, Q12 is turned off, and the desired constant current is not supplied to the first-stage amplifiers A11, A12. Similarly, when the shutdown signal goes high, the output of the inverter INV2 goes high and the NMOS transistor Q0 is turned on.
N, which causes the gates of the NMOS transistors Q2 to Q5 to go to the low level,
2 to Q5 are turned off, and the desired constant current is not supplied to the differential amplifiers A2 and A3, the comparator CMP and the buffer B.

In this way, when the operation of the optical receiving circuit 11 is unnecessary, the shutdown signal is set to the high level to shut down the bias circuit 13, thereby shutting down the bias current supplied to each internal circuit. You can As a result, the optical receiver circuit 1
It is possible to reduce the power consumption by 1. For example, the current consumption of the optical receiver circuit 11 during normal operation is 2 mA on average, and at shutdown it is 1 μA at maximum. This makes it possible to extend the standby time from 250 hours to 300 hours when a battery of 500 mAH is mounted on a mobile phone terminal, for example.

In order to realize such shutdown control for power saving, the optical receiving circuit 11
By incorporating the shutdown control circuit 14 and the control MOS transistors Q10 and Q0 in the chip,
Power can be directly supplied from a main regulator and a smoothing capacitor (not shown), and the mounting area is 16% smaller than that when a shutdown control regulator IC and the smoothing capacitor are provided on the way.
It can be reduced and the cost can be reduced.
Further, the current consumption during operation is, for example, 12 mA on average because the current consumption due to the shutdown control regulator IC and its smoothing capacitor is eliminated.
Can be reduced to 1/6 of the above 2 mA. In this case, if Vcc = 1.5V, the power consumption is 3 mW.

Further, in the bias circuit 13, normally,
MOS transistors Q11, Q12; Q2 to Q5, which are first MOS transistors having a diode structure and each of which supplies a constant current to each internal circuit, are divided according to polarity, and a plurality of the MOS transistors Q11, Q12;
2 to Q5 are collectively controlled by the second MOS transistors Q10 and Q0, respectively. Therefore, when the transistors Q11 and Q12; Q2 to Q5 are bipolar transistors, they are turned on at the time of shutdown. While it is necessary to supply a base current to Q10 and Q0, by using a MOS transistor, it is only necessary to apply a voltage to the gate, and such an unnecessary current does not flow, resulting in lower power consumption. Can be converted.

Furthermore, when the output circuit 12 is composed of bipolar transistors, it is of an open collector type in order to increase the amplitude range of the output Vout,
In order to further speed up the response of the output Vout by externally attaching a pull-up resistor, C of the parasitic capacitance or load capacitance of the bipolar transistor and the pull-up resistor is used.
In order to reduce the R time constant, it is necessary to reduce the value of the pull-up resistor, which increases the load current flowing through the pull-up resistor, whereas the MOS transistors QP and QN are used. Since the response of the MOS transistor is determined by the ON resistance, the load current does not increase, and a sufficient response speed can be realized with low power consumption.

As described above, in the present invention, the amplifier A1
1, A12, A2, A3, a comparator CMP, a buffer B, etc., a BiCMOS process in which a MOS process is added to the bipolar process is adopted.
S transistors Q11, Q12, Q10: Q2 to Q5
Creating Q0.

FIGS. 3 to 6 are diagrams showing an optical / electrical shared transmission apparatus 21 according to an embodiment of the present invention, which is equipped with the chip of the optical receiving circuit 11 configured as described above. 3 is a plan view, FIG. 4 is a sectional view taken along the section line AA of FIG. 3, and FIG. 5 is a front view of a module 22 on which the chip of the optical receiving circuit 11 is mounted. The module 22
In the optical / electrical shared transmission device 21, the plug 23
Is provided on the side opposite to the insertion port 24 of the optical receiving circuit 1
One chip faces the head of the plug 23.

FIG. 6 is a diagram showing the presence / absence of the plug 23 and its type detection. The plug 23 is a single-headed stereo mini plug PL1 for so-called audio.
It is created based on. With this plug PL1,
The head portion PL1a is for the L channel signal, the short body portion PL1b connected to it is for the R channel signal, and the long body portion PL1c connected to it is for the LR shared GND. To transmit an analog audio signal.

On the other hand, the plug PL2 for transmitting the digital audio signal via the electric wire is the head PL2a.
Is for + signal, and the short body part PL2b connected to it
Is for signals, and the short body part P connected to it is
L2c is for GND, and the short body part PL2d connected to it is insulated.

Further, in the plug PL3 for transmitting a digital audio signal through the optical fiber, the head portion PL3a is made of metal, and the long body portion PL3b connected to it is insulated. Through the optical fiber, and the end face thereof is exposed from the tip of the head PL3a.

The optical / electrical shared transmission device 21 generally has a cylindrical holder 25 having the insertion port 24 therein.
And the module 22. As described above, the module 22 is provided at the tip of the insertion port 24, and the module 22 has four terminals 26a, which are drawn out from the peripheral portion of the chip of the optical receiving circuit 11.
26b, 26c and 26d are provided. The terminals P11, P12, P13, P14 of the chip and these terminals 26a, 26b, 26c, 26d are electrically connected by bonding wires 27, respectively.
The terminal 26a becomes an input terminal of the power supply voltage Vcc, and the terminal 2
6b serves as an input terminal for the ground potential GND, the terminal 26c serves as an output terminal for the output signal Vout, and the terminal 26d serves as an input terminal for a shutdown signal.

The module 22 includes the optical receiving circuit 1
After the first chip is mounted on the frame 26e connected to the GND potential terminal 26b, the terminals 26a, 26b, 26
The terminals 26a, 26b, 26c and 26d are formed by internally connecting the c and 26d and the chip by wire bonding and then molding with a translucent resin.
Are integrally molded. For example, the optical receiving circuit 11
Has a chip size of 1.3 mm square and has terminals 26a, 2
The terminal width of 6b, 26c, and 26d is 0.4 mm.

On the other hand, in the holder 25, the insertion port 2
4 from the inner peripheral surface to the outside, terminals 28a, 28 for electrical connection
b, 28c, 28d, 28e and 28f are formed. The terminals 28a, 28b and 28c are for transmitting audio signals and correspond to the plugs PL1 and PL2. When the plugs PL1 and PL2 are fitted into the insertion port 24, the terminals 28a, 28b and 28c are respectively connected to respective parts. PL1a, PL
2a; PL1b, PL2b: electrically connected to PL1c, PL2c.

On the other hand, the terminals 28d, 28e, 28
f is a terminal for determining whether or not the plug 23 is inserted and the type of the plug 23, and outside the opto-electric shared transmission device 21, the terminal 28d is connected to the reference voltage Vref via the pull-up resistor R1. The terminal 28e is connected to GND, and the terminal 28f is connected to the reference voltage Vref via the pull-up resistor R2. Also, the terminal 28c
Is also externally connected to the reference voltage Vref via the pull-up resistor R3. Furthermore, the terminal 28e is a movable contact 28g, which forms a switch with a fixed contact 28h connected to the terminal 28d. When the plug 23 is attached, the movable contact 28g is pressed by the plug 23.
Contacts the fixed contact 28h and is separated when not mounted.

Therefore, each pull-up resistor R1,
The potentials of the terminals 28d, 28f, 28c connected to the reference voltage Vref via R2, R3 are respectively V1, V
2, V3, as shown in FIG. 6, contact points 28g, 2
The potential V1 is at a low level when 8h is conducted, and the terminal 28
When the potentials V2 and V3 are all low level due to conduction between the f and 28c and the terminal 28e by the long body portion PL1c, it is determined that the plug PL1 for analog electric signal is attached. You can Also, the contact 28
When g and 28h are conducted, the potential V1 is low level, and the terminal 28f is insulated by the short body portion PL2d, so that the potential V2 is
Is high level and the potential V3 becomes low level due to conduction between the terminal 28c and the terminal 28e by the short body portion PL2c, it can be determined that the plug PL2 for digital electric signal is attached. Furthermore, the contacts 28g, 2
The potential V1 is at a low level when 8h is conducted, and the terminal 28
When the potentials V2 and V3 become high level due to the long barrel portion PL3b insulating between f and 28c and the terminal 28e, it can be determined that the plug PL3 for optical digital signal is attached. Further, when the contacts 28g and 28h are cut off, the potential V1 is at a high level, and when the terminals 28f and 28c and the terminal 28e are opened, the potentials V2 and V3 are also at a high level. Plug P
It is possible to determine that L1 to PL3 are not mounted either.

In this way, whichever plug PL1 to PL3 of electric analog, electric digital, or optical digital is used, whether or not those plugs PL1 to PL3 are mounted, and if they are mounted, It will be appreciated that the type can be determined and shared with any signal.

In the above description, the optical receiver circuit 11 is used as an example of the chip mounted on the module 22 provided in the optical / electrical shared transmission device 21.
It may be an optical transmission circuit. Module 32 in that case
An example of is shown in FIG. The module 32 is configured to include a light emitting element LED and a drive circuit 33 that drives the light emitting element LED and mounts the shutdown circuit. The chip of the light emitting element LED is mounted on the frame 36e connected to the input terminal 36a of the power supply voltage Vcc, the chip of the drive circuit 33 is mounted on the frame 36f connected to the terminal 36b of the GND potential, and the input terminal 36a of the power supply voltage Vcc, The bonding wire 37 is formed by connecting the GND potential terminal 36b, the input signal Vin input terminal 36c and / or the shutdown signal input terminal 36d to the chip.
After they are electrically connected to each other, they are molded using a translucent resin.

8 to 11 are diagrams showing the modes of shutdown control. In these examples, the chip of the above-mentioned optical receiving circuit 11 is used as the optical / electrical shared transmission device 21, but the same applies to the chip of the light emitting element LED and the driving circuit 33. 8 to 10
In the example of FIG. 6, from the above-mentioned FIG.
In this example, power is supplied only when 1 is at a low level and the potential V3 is at a high level, and a shutdown operation may be performed at the time of remaining.
That is, the potentials V1 and V3 are used as plug insertion presence / absence detecting means and plug type detecting means.

The example of FIG. 8 is an example in which a simple logic circuit 41 is provided outside the optical / electrical shared transmission device 21 as a control circuit for determining the necessity of shutdown, and the logic circuit 41 includes an inverter 42. And an OR circuit 43. The potential V1 is directly applied to one input of the OR circuit 43, and the other input of the OR circuit 43 is input after the potential V3 is inverted by the inverter 42.
Therefore, the shutdown signal SD supplied from the inverter 43 to the terminal 26d becomes low only when the two inputs of the OR circuit 43 are both low level, that is, the potential V1 is low level and the potential V3 is high level. It becomes a level, and when it remains, it becomes a high level.

Thus, only by adding the simple logic circuit 41, the power is supplied only when the plug 23 is inserted and it is the plug PL3 for the optical digital signal, and the plug 23 is not inserted. In this case, and if the plugs are electric plugs PL1 and PL2 even if they are inserted, the shutdown control for cutting off the power supply can be performed.

Further, the example of FIG. 9 is an example of using the optical receiving circuit 11a having a function as an internal determination circuit for determining the necessity of shutdown. That is, a circuit such as the logic circuit 41 is further provided in the optical receiving circuit 11a, and the optical receiving circuit 11a has a potential as the plug insertion presence / absence detecting means and the plug type detecting means. Two terminals 26d are provided as input terminals for the shutdown signal in order to input V1 and the potential V3, respectively.
1, 26d2.

As a result, the optical / electrical shared transmission device 21a is provided.
Shutdown control can be performed appropriately by the internal judgment of the system, and because it is controlled by a simple logical process inside, it is possible to perform the shutdown control without giving a software-like burden to an external microcomputer. it can.

Furthermore, the example of FIG. 10 is an example in which a control circuit 44 for determining the necessity of shutdown is provided outside the optical / electrical shared transmission device 21, and the control circuit 44 is for digital signal processing. Microcomputer or digital signal processor (D
SP) can also be used. The control circuit 44 receives the potentials V1 and V3 as the plug insertion presence / absence detecting means and the plug type detecting means, and outputs a shutdown signal SD to the terminal 26d of the optical receiving circuit 11 in response to the potentials V1 and V3. To do.

Thus, shutdown control can be performed without separately providing a dedicated circuit such as the logic circuit 41. In addition, it is possible to perform control such as canceling the shutdown after a lapse of a predetermined delay time after determining whether or not the plug is inserted and the type.

Further, in the example of FIG. 11, as in the example of FIG. 10, a control circuit 45 which also serves as a microcomputer or DSP for digital signal processing provided outside is used, and the control circuit 45 thereof is also used. Is an example of determining whether or not shutdown is necessary in response to an operation on the key operation circuit 46 and performing control.

As a result, it is possible to realize control such that power is supplied to the optical receiving circuit 11 after a recording state, as in the case of downloading audio data from a digital audio device to a mobile phone terminal, for example, and operation of the device. Shutdown control can be performed according to the state. It is needless to say that the potential V1 and the potential V3 may be input to the control circuit 45 to perform the shutdown control in more detail by combining the external operation and the results of the insertion detection and the type detection. Yes.

FIG. 12 shows another embodiment of the present invention.
It will be described below with reference to FIG.

FIG. 12 is a front view of an optical transmission device 51 of another embodiment of the present invention in which the above-mentioned optical receiving circuit 11 is mounted, and FIG. 13 is a side view thereof. 12 and 13, parts corresponding to those in FIGS. 3 to 5 are designated by the same reference numerals, and the description thereof will be omitted. This optical transmission device 51 is a digital audio interface standard R
A rectangular optical transmission device conforming to C-5720B, in which a holding body 52 for accommodating and holding the optical receiving circuit 11 is formed with a substantially rectangular insertion port 53, and the optical receiving circuit 11 is provided with this insertion port. It is located at the rear of 53. The rectangular insertion port 53
At the pair of inner peripheral surfaces (upper surface and lower surface in FIGS. 12 and 13) facing each other, conductive contact pieces 54,
55, and these contact pieces 54, 55 communicate with terminals 54a, 55a extending from the outer peripheral surface of the holding body 52 (the lower surface in FIGS. 12 and 13) to the outside, respectively. The plug 56 mounted on the inner peripheral surface of the insertion port 53 is also mounted.
Pair of spring portions 53a for generating elastic force for holding
Is provided.

Correspondingly, the plug 56 is formed with a substantially rectangular insertion tube portion 57 fitted in the insertion port 53, and the optical fiber 58 is held in the insertion tube portion 57. ing. The pair of outer peripheral surfaces (the upper surface and the lower surface in FIGS. 12 and 13) of the square-shaped insertion tube portion 57 face the leaf spring-shaped conductive contact pieces 59a and 59b.
These contact pieces 59a. 59b are short-circuited to each other by a short-circuit piece 59 in the plug 56.

Therefore, when the plug 56 is attached to the insertion port 53, the end surface of the optical fiber 58 faces the light receiving surface of the photodiode PD, and the contact pieces 54, 55 are contacted by the contact pieces 59a, 59b and the short-circuit piece 59. Shorted to each other. Therefore, for example, the terminal 54a is pulled up to the power supply voltage Vcc by a pull-up resistor or the like,
By setting the terminal 55a to the GND potential, the terminal 54a
It is possible to detect the attachment from the potential of and to perform the shutdown control described above.

With respect to still another embodiment of the present invention,
The following is a description based on FIGS. 14 to 17.

FIG. 14 is a front view of an optical transmission device 61 according to still another embodiment of the present invention in which the above-described optical receiving circuit 11 is mounted, FIG. 15 is a side view thereof, and FIG. 16 is FIG.
17 is a cross-sectional view as seen from the section line B-B of FIG.
5 is a sectional view taken along the line C-C of FIG. 5, and FIG. 18 is a sectional view showing a state in which the plug 69 is mounted in FIG. 16.
This optical transmission device 61 is similar to the above-described optical transmission device 51, and corresponding parts are designated by the same reference numerals and description thereof is omitted. It should be noted that in this optical transmission device 61, a shutter 63 is provided at the insertion port 53.

Correspondingly, the holding body 62 is provided with a pair of upper and lower pins 64 for supporting one end of the shutter 63 so as to be swingable about a vertical axis, and the shutter 63 from the inside to the outside. A spring 65 that urges toward one side is provided. Further, the holding body 62 has a part of the inner wall 6 corresponding to one end 65b of the spring 65 that presses the shutter 63.
6 is formed of a conductive resin or a metal terminal. The spring 65 and the inner wall 66 are formed to extend to the outside and serve as terminals 65a and 66a.

Therefore, the spring 65 and the inner wall 66 constitute a switch which is turned on / off depending on whether the plug 69 is attached or not. That is, in the state where the plug 69 is not attached and the shutter 63 is closed, the one end 65b of the spring 65 is separated from the inner wall 66, thereby disconnecting the terminals 65a and 66a. On the other hand, when the plug 69 is attached, the shutter 63 is opened, and the one end 65b of the spring 65 contacts the inner wall 66, whereby the terminals 65a and 66a are electrically connected. In this way, whether or not the plug 69 is attached can be detected from the opened / closed state of the shutter 63.

As a result, it is not necessary to provide a dedicated metal terminal for detecting attachment such as the contact pieces 54 and 55. The shutter 63 itself is made of conductive resin or metal and is connected to an external terminal.
The attachment detection may be performed based on whether or not the inner wall 66 and the inner wall 66 are electrically connected to each other.

The above-described chip of the optical receiving circuit 11 of the present invention, the chip of the light emitting element LED and the driving circuit 33, and the transmission devices 21, 51 and 61 equipped with them are at least electronic devices for communicating optical signals, particularly In a portable device with strong demand for power saving, shutdown control can be realized without increasing the chip area of the circuit portion, which is preferable.

[0079]

As described above, the optical-electrical shared transmission apparatus of the present invention is similar to the stereo mini-plug jack in comparison with the electric signal transmission apparatus realized by so-called audio stereo mini-plug jacks. In a shared optical / electrical transmission device capable of transmitting an optical signal by using an optical fiber as a transmission medium by using a plug / jack in a shape, a photoelectric conversion element such as a photodiode or a light emitting diode and a light receiving amplifier circuit or A shutdown circuit is further mounted in the same chip in the circuit section in which a signal processing circuit related to the photoelectric conversion element such as a drive circuit is mounted.

Therefore, it is possible to perform shutdown control for power saving without increasing the chip area of the circuit portion as well as the photoelectric sharing of the plug and jack.

As described above, the optical / electrical common transmission device of the present invention performs the shutdown control according to the presence / absence of the plug insertion and the plug type.

Therefore, the shutdown control can be appropriately performed.

Further, as described above, the shared optical / electrical transmission device of the present invention performs the shutdown control by the internal determination circuit according to the presence / absence of the plug insertion and the plug type.

Therefore, the shutdown control can be appropriately performed, and since the control is performed by a simple logic process inside, the software load is not given to the external microcomputer or the like.

Further, in the optical / electrical transmission device of the present invention, as described above, the control circuit provided outside determines whether or not the shutdown is required in response to the operation of the external key.

Therefore, for example, the shutdown control can be performed in detail in response to an external operation such that the power is supplied only during recording and the power is cut off during other reproduction.

Furthermore, as described above, the optical transmission device of the present invention is an optical transmission device that transmits an optical signal by using an optical fiber as a transmission medium, and is an optical device such as a photodiode or a light emitting diode. -In the same chip, a shutdown circuit is further mounted in the circuit section in which the signal processing circuits related to the opto-electric conversion element such as the electro-conversion element and the light receiving amplifier circuit and the drive circuit are mounted.

Therefore, the shutdown control for power saving can be performed without increasing the chip area of the circuit portion.

Further, in the optical transmission device of the present invention, as described above, the control circuit provided outside determines the necessity of shutdown in response to the operation of the external key.

Therefore, for example, the shutdown control can be performed in detail in response to an external operation such that the power is supplied only during recording and the power is cut off during other reproductions.

Further, in the optical transmission device of the present invention, as described above, when the plug is fitted in the jack portion, the optical transmission device comes into contact with a predetermined first metal terminal provided on the plug. Two metal terminals are provided, and correspondingly, the circuit section is provided with an internal determination circuit that determines the necessity of shutdown in response to the detection result of the second metal terminal.

Therefore, the shutdown control can be appropriately performed by the internal determination circuit depending on whether the plug is inserted or not. Further, since the control is performed by a simple logic process inside, there is no software burden on an external microcomputer or the like.

As described above, the optical transmission apparatus of the present invention is provided with a shutter and a switch that opens and closes in conjunction with opening and closing of the shutter at the insertion port of the jack section, and correspondingly, the circuit section. Is provided with an internal determination circuit that determines whether or not shutdown is required in response to the detection result of the switch.

Therefore, when the shutter is opened / closed depending on whether the plug is inserted or not, the internal determination circuit can appropriately perform the shutdown control based on the switching state of the switch interlocked with the shutter. Further, since the control is performed by a simple logic process inside, there is no software burden on an external microcomputer or the like. Furthermore, it is not necessary to provide the plug with a dedicated metal terminal for mounting detection.

[Brief description of drawings]

FIG. 1 is a block diagram showing an electrical configuration of an optical receiver / transmission device or an optical receiving circuit that realizes an optical transmission device according to an embodiment of the present invention.

FIG. 2 is a block diagram showing a specific configuration of a bias circuit and a shutdown circuit in the optical receiving circuit shown in FIG.

FIG. 3 is a plan view showing an optical / electrical shared transmission apparatus according to an embodiment of the present invention in which the chip of the optical receiving circuit shown in FIGS. 1 and 2 is mounted.

4 is a cross-sectional view taken along the section line AA of FIG.

FIG. 5 is a front view of a module on which the chip of the optical receiving circuit is mounted.

FIG. 6 is a diagram showing how a plug is attached and its type is detected.

FIG. 7 is a diagram showing an example of a transmission module as an example of the optical communication circuit chip.

FIG. 8 is a diagram showing an example of shutdown control.

FIG. 9 is a diagram showing another example of shutdown control.

FIG. 10 is a diagram showing still another example of shutdown control.

FIG. 11 is a diagram showing another example of shutdown control.

FIG. 12 is a front view of an optical transmission device according to another embodiment of the present invention, which is equipped with the optical receiving circuit described above.

FIG. 13 is a side view of FIG.

FIG. 14 is a front view of an optical transmission device according to still another embodiment of the present invention, which is equipped with the above-described optical receiving circuit.

FIG. 15 is a side view of FIG.

16 is a cross-sectional view taken along the section line BB of FIG.

FIG. 17 is a sectional view taken along the line C-C in FIG.

FIG. 18 is a cross-sectional view showing a state in which the plug is attached to FIG. 16.

FIG. 19 is a cross-sectional view showing the structure of a typical optical / electrical shared transmission device of a typical prior art.

FIG. 20 is a cross-sectional view showing the structure of another conventional optical-electrical shared transmission device.

[Explanation of symbols]

11 Optical Receiver Circuit 11a Optical Receiver Circuit (Internal Judgment Circuit) 12 Output Circuit 13 Bias Circuit 14 Shutdown Circuit 21, 21a Photoelectric Common Transmission Device 22, 32 Module 23, 56, 69 Plug 24, 53 Insertion Port 25, 52, 62 Holders 26a, 26b, 26c, 26d; 36a, 36b, 3
6c, 36d terminals 26d1, 26d2 terminals 27, 37 bonding wires 28a, 28b, 28c, 28d, 28e, 28f
Terminals 28g, 28h Contact points (insertion presence / absence detection means, type detection means) 33 Drive circuit 41 Logic circuit 42 Inverter 43 OR circuit 44, 45 Control circuit 46 Key operation circuit 51, 61 Optical transmission device 53a Spring portion 54, 55 Contact piece ( Second metal terminal) 54a, 55a terminal 56 Short-circuit piece 57 Inserting tube portion 58 Optical fiber 59a, 59b Contact piece (first metal terminal) 63 Shutter 65 Spring (switch) 65a, 66a Terminal 66 Inner wall (switch) A11, A12 First stage amplifier A2, A3 Differential amplifier B Buffer C1, C2 Coupling capacitor CD Dummy capacitance CMP Comparator INV1, INV2 Inverter LED Light emitting element P11 Power input terminal P12 Ground terminal P13 Output terminal P14 Shutdown input terminal PD Photodiode PL1 Electrical analog plug L2 electric digital plug PL3 optical digital plug PL1a; PL2a; PL3a head PL1b; PL2b, PL2c short trunk PL1c long trunk PL2d short trunk PL3b long trunk Q0 NMOS transistor (second MOS transistor) Q2, Q3 , Q4, Q5 NMOS transistors (first
MOS transistor) Q10 PMOS transistor (second MOS transistor) Q11, Q12 PMOS transistor (first MO transistor)
S transistor) QP PMOS transistor QN NMOS transistor R1, R2, R3 pull-up resistance (insertion presence / absence detection means, type detection means) R11, R12 resistance R21, R22 pull-up resistance

─────────────────────────────────────────────────── ─── Continuation of front page (51) Int.Cl. ⁷ Identification code FI theme code (reference) H04B 10/13 H01L 31/10 G 10/135 10/14 // H01R 107: 00 F term (reference) 5E023 AA27 AA29 HH30 5E087 EE09 PP06 QQ01 QQ06 RR49 5F049 MA01 NA19 NA20 NB01 NB10 RA06 RA10 UA11 UA20 5F089 AA01 AC02 AC17 CA21 FA03 FA10 5K102 AA20 AA48 AB08 AN02 LA04 LA05 LA17 LA38

Claims (9)

[Claims] 1. A plug having a circuit section mounting an opto-electric conversion element and an optoelectronic jack section, which is attached to an end of a transmission medium and has a similar shape between an optical signal and an electric signal. By being fitted to the jack for shared optoelectronics, through the transmission medium of either optical or electrical, in the optoelectronic shared transmission device capable of performing transmission of any of the optical signal and the electrical signal, The circuit portion includes the photoelectric conversion element and the optical conversion element.
A shutdown circuit is mounted together with a signal processing circuit related to the electrical conversion element, and the shutdown circuit shuts off the power supply of the photoelectric conversion element and the signal processing circuit in response to a shutdown signal input to a shutdown terminal from the outside. A shared optical-electrical transmission device. 2. A control circuit provided externally determines whether or not a shutdown is required, in response to a detection result of a plug insertion presence / absence detection means and a plug type detection means provided in the photoelectric shared jack section. The shared optical-electrical transmission device according to claim 1, wherein the shutdown signal is output to a shutdown terminal. 3. The photoelectric common-use jack section is provided with plug insertion presence / absence detection means and plug type detection means, and the circuit section responds to detection results of the insertion presence / absence detection means and type detection means. The shared optical / electrical transmission device according to claim 1, further comprising: an internal determination circuit that determines whether or not the shutdown is necessary and outputs the shutdown signal to the shutdown terminal. 4. A photoelectric control circuit according to claim 1, wherein a control circuit provided outside determines whether or not shutdown is required in response to an external key operation and outputs the shutdown signal to the shutdown terminal. Shared transmission equipment. 5. An optical fiber comprising: a circuit section on which an opto-electric conversion element is mounted; and a jack section, wherein a plug attached to an end of the optical fiber is fitted into the jack section, An optical transmission device capable of transmitting an optical signal via the optical-electrical conversion element and the optical-electrical conversion element in the circuit section.
A shutdown circuit is mounted together with a signal processing circuit related to the electrical conversion element, and the shutdown circuit shuts off the power supply of the photoelectric conversion element and the signal processing circuit in response to a shutdown signal input to a shutdown terminal from the outside. An optical transmission device characterized by: 6. The optical device according to claim 5, wherein an externally provided control circuit determines the necessity of shutdown in response to an external key operation and outputs the shutdown signal to the shutdown terminal. Transmission equipment. 7. The jack portion is provided with a second metal terminal which comes into contact with a predetermined first metal terminal provided on the plug when the plug is fitted therein, and the circuit portion is provided. The optical determination circuit according to claim 5, further comprising: an internal determination circuit that determines whether or not shutdown is required and outputs the shutdown signal to the shutdown terminal in response to a detection result of the second metal terminal. Transmission equipment. 8. A shutter and a switch that opens and closes in conjunction with opening and closing of the shutter are provided at an insertion opening of the jack section, and the circuit section responds to a detection result of the switch,
The optical transmission device according to claim 5, wherein an internal determination circuit that determines whether or not shutdown is necessary and outputs the shutdown signal to the shutdown terminal is provided. 9. An electronic apparatus using the optical-electrical shared transmission device according to any one of claims 1 to 4 or the optical transmission device according to any one of claims 5 to 8.