the following descriptions of the preferred embodiments are provided to understand the features and the structures of the present invention . please refer to fig1 and fig2 , which are a perspective view and a structural view showing a first preferred embodiment according to the present invention . as shown in the figures , the present invention is a smoke detector having a camera , comprising a detector [ 11 ] and an image capture unit [ 12 ], where signals from the detect or [ 11 ] and signals from the image capture unit [ 12 ] are processed simultaneously to obtain an early notice . the detector [ 11 ] comprises a first sensor [ 111 ]; a second sensor [ 112 ] corresponding to the first sen so [ 111 ]; and a switching circuit unit [ 113 ] connecting to the first sensor [ 111 ], the second sensor [ 112 ] and a power unit [ 13 ]. the image capture unit [ 12 ] is a camera made of a charge - coupled device ( ccd ) or a complementary metal - oxide semiconductor ( cmos ); and is connected to the power unit [ 13 ]. thus , with the above structure , a novel smoke detector having a camera is obtained . please refer to fig3 , which is a view showing a state of use of the first preferred embodiment . as shown in the figure , when u sing the first preferred embodiment , a first sensor [ 111 ] of a detector [ 11 ], which is an inner ion chamber generating a first current , and a second sensor [ 112 ] of the detector [ 11 ], which is an outer ion chamber generating a second ion current , are used to obtain the detector [ 11 ] as an ion detector located in a specific environment . an image capture unit [ 12 ] is connected with a display screen [ 32 ] in a control room [ 3 ] so that the image capture unit [ 12 ] transfers image of the specific environment to be displayed on the display screen [ 32 ]. and a power unit [ 13 ] is connected with a switching circuit unit [ 113 ] and the image capture unit [ 12 ] to supply power to the first sensor [ 111 ], the second sensor [ 112 ] and the image capture unit [ 12 ]. when using the first preferred embodiment , the first sensor [ 111 ] and the second sensor [ 111 ] have americium - 241 ( am - 241 ) inside as s radiation source and a certain volt difference is kept between the first sensor [ 111 ] and the second sensor [ 111 ]. when there is no smoke in the environment , the ion currents and the volt difference are remained unchanged once there is a smoke around the second sensor [ 112 ], the ion current and the volt of the second sensor [ 112 ] are changed . if , then , the volt difference becomes greater than a default value for the volt difference , the switching circuit unit [ 113 ] is switched on automatically and an alarm signal is transferred to the control panel [ 31 ]. thus , signals from the detector [ 11 ] and signals from the image capture unit [ 12 ] are processed simultaneously to obtain an early notice . please refer to fig4 , which is a view showing a state of use of a second preferred embodiment . as shown in the figure , in a specific environment , a first sensor [ 111 a ] of a detector [ 11 a ] is a light - emitting unit and a second sensor [ 112 a ] of the detector [ 11 a ] is a light - receiving unit so that the detector [ 11 a ] is made as an optoelectrical detector . an image capture unit [ 12 ] is connected with a display screen [ 32 ] in the control room [ 3 ] so that the image capture unit [ 12 ] transfers image of the specific environment to be displayed on the display screen [ 32 ]. and a power unit [ 13 ] is connected with a switching circuit unit [ 113 ] and the image capture unit [ 12 ] to supply power to the first sensor [ 111 a ], the second sensor [ 112 a ] and the image capture unit [ 12 ]. when using the second preferred embodiment , the first sensor [ 111 a ] emits a light beam in a certain direction along a light axis to be received by the second sensor [ 112 a ]. when there is no smoke in the specific environment an illumination generated by the first sensor [ 111 a ] and the illumination received by the second sensor [ 112 a ] have the same strength . once there is a smoke having a density higher than a certain limit in the environment , the light beam a long the light axis is scattered so that the illumination received by the second sensor [ 112 a ] is weakened . when the illumination received by the second sensor [ 112 a ] is weakened to a certain degree , the switching circuit unit [ 113 ] is switched on automatically and an alarm signal is transferred to the control panel [ 31 ]. thus , signals from the detector [ 11 a ] and the image capture unit [ 12 ] are processed simultaneously to obtain an early notice . please refer to fig5 and fig6 , which are a perspective view and a structural view showing a third preferred embodiment . as shown in the figures , the third embodiment comprises a detect or [ 11 ], an image capture unit [ 12 ] and a first power frequency carrier device [ 51 a ], where signals from the detector [ 11 ] and signals from the image capture unit [ 12 ] are processed simultaneously to obtain an early notice ; and an easy installation at any place is obtained through using the first power frequency carrier device [ 51 a ] without a complex wiring . the detector [ 11 ] comprises a first sensor [ 111 ]; a second sensor [ 112 ] corresponding to the first sensor [ 111 ]; and a switching circuit unit [ 113 ] connecting to the first sensor , the second sensor and a power unit [ 13 ]. the image capture unit [ 12 ] is a camera connected to the power unit [ 13 ]. the first power frequency carrier device [ 51 a ] is connected with the power unit [ 13 ]; and has a first connection unit [ 52 a ] to connect to an indoor power source [ 6 ]. thus , with the above structure , a novel smoke detector having a camera is obtained . please refer to fig7 , which is a block view showing the power frequency carrier device . as shown in the figure , a first power frequency carrier device [ 51 a ] comprises a single - chip control module [ 511 ]; a power carrier module [ 512 ] having a transmission rate of 1200 bps ( bit per second ); an electricity module [ 513 ] providing required powers for the single - chip control module [ 511 ] and the power carrier module [ 512 ]; an input unit [ 514 ] connecting to a power u nit [ 13 ]; and an output unit [ 51 5 ] connecting to a first connection unit [ 52 a ], where the single - chip control module [ 511 ] comprises an output controller [ 5111 ], a relay [ 5112 ], a control unit [ 5113 ], a communication interface [ 5114 ] and an input receiver [ 5115 ]. therein , the control unit [ 5113 ] of the first power frequency carrier device [ 51 a ] is a 8051 single - chip as a processing unit with a good inner structure , whose working frequency is up to 16 mhz with a 4 k size of electrically programmable and erasable rom ( read only memory ) together with eight input pins and eight output pins . the relay [ 5112 ] is located at the output pins of the 8051 single - chip to quarantine the circuit for securing and ensuring the operation of the single - chip control module [ 511 ]. the 8051 single - chip contains the full - duplex communication interface [ 5114 ] in side . the communication interface [ 5114 ] is an rs232 interface to simultaneously transfer and receive data to and from outside . the operational signals in the 8051 single - chip are on a ttl ( transistor - transistor - logic ) level ( 0 volt is set as logic 0 and + 5 volts is set as logic 1 ) and the communication interface [ 5114 ] is a serial communication interface to transfer and receive data in a form of bit series . please further refer to fig8 , which is a view showing a state of use of the third preferred embodiment . as shown in the figure , a detector [ 11 ] as an ion detector coordinated with a first power frequency carrier device [ 51 a ] is located in a specific environment , where a first connection unit [ 52 a ] is connected with the first power frequency carrier device [ 51 a ] and an indoor power source [ 6 ]. a control panel [ 31 ] having a second power frequency carrier device [ 51 b ] is set in a control room [ 3 ], where a second connection unit [ 52 b ] is connected with the second power frequency carrier device [ 51 b ] and an indoor power source [ 6 ]. and a display screen [ 32 ] having a third power frequency carrier device [ 51 c ] is set in the control room [ 3 ], where a third connection unit [ 52 c ] is connected with the third power frequency carrier device [ 51 c ] and an indoor power source [ 6 ]. thus , the present invention is installed , where real time image of the environment is displayed on the display screen [ 32 ]. once there is a smoke around a second sensor [ 112 ] in the environment an ion current and a volt of the second sensor [ 112 ] are changed . if , then , the volt difference between a first sensor [ 111 ] and the second sensor [ 112 ] becomes greater than a default value for the volt difference , a switching circuit unit [ 113 ] is switched on automatically and an alarm signal is transferred to the control panel [ 31 ] from the detector [ 11 ]. therein , the detector [ 11 ] and an image capture unit [ 12 ] are supplied with power by a power unit [ 13 ]; and signals from the detector [ 11 ] and signals from the image capture unit [ 12 ] are transferred from the first power frequency carrier device [ 51 a ] through the first connection unit [ 52 a ] along the indoor power source [ 6 ] to the second connection unit [ 52 b ] of the control panel [ 31 ] and the fourth connection unit [ 52 b ] of the display screen [ 32 ], respectively . thus , signals from the detector [ 11 ] and signals from the image capture unit [ 12 ] are processed simultaneously to obtain an early notice ; and an easy installation at any place is obtained through using a power frequency carrier device without a complex wiring . please further refer to fig9 , which is a view showing a state of use of a fourth preferred embodiment . as shown in the figure , a detector [ 11 a ] as a light - emitting unit coordinated having a first power frequency carrier device [ 51 a ] is located in a specific environment , where a first connection unit [ 52 a ] is connected with the first power frequency carrier device [ 51 a ] and an indoor power source [ 6 ]. a control panel [ 31 ] having a second power frequency carrier device [ 5 1 b ] i s set in a control room [ 3 ], where a second connection unit [ 52 b ] is connected with the second power frequency carrier device [ 51 b ] and an indoor power source [ 6 ]. and a display screen [ 32 ] having a third power frequency carrier device [ 51 c ] is set in the control room [ 3 ], where a third connection unit [ 52 c ] is connected with the third power frequency carrier device [ 51 c ] and an in door power source [ 6 ]. thus , the present invention is installed , where real time image of the specific environment is displayed on the display screen [ 32 ]. once a smoke having a density higher than a certain limit a rises in the environment , the light beam a long the light axis is scattered so that an illumination received by a second sensor [ 112 a ], which is emitted from a first sensor [ 111 a ], is weakened . when the illumination received by the second sensor [ 112 a ] is weakened to a certain degree , the switching circuit unit [ 113 ] is switched on automatically and an alarm signal is transferred to the control panel [ 31 ] from the detector [ 11 a ]. therein , the detector [ 11 a ] and an image capture unit [ 12 ] are supplied with power by a power unit [ 1 3 ]; and signals from the detector [ 11 a ] and signals from the image capture unit [ 12 are transferred from the first power frequency carrier device [ 51 a ] through the first connection unit [ 52 a ] a long the indoor power source [ 6 ] to the second connection unit [ 52 b ] of the control panel [ 31 ] and the third connection unit [ 52 c ] of the display screen [ 32 ], respectively . thus , signals from the detector [ 11 a ] and signals from the image capture unit [ 12 ] are processed simultaneously to obtain an early notice ; and an easy installation at any place is obtained through using power frequency carrier device without a complex wiring . to sum up , the present invention is a smoke detector having a camera , where signals from a detector and signals from an image capture unit are processed simultaneously to obtain an early notice ; and an easy installation at any place is obtain ed through using a power frequency carrier device without a complex wiring . the preferred embodiments herein disclosed are not intended to unnecessarily limit the scope of the invention . therefore , simple modifications or variations belonging to the equivalent of the scope of the claims and the instructions disclosed herein for a patent are all within the scope of the present invention .