CN109459918B - Image forming apparatus with a toner supply device - Google Patents
Image forming apparatus with a toner supply device Download PDFInfo
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- CN109459918B CN109459918B CN201811024272.XA CN201811024272A CN109459918B CN 109459918 B CN109459918 B CN 109459918B CN 201811024272 A CN201811024272 A CN 201811024272A CN 109459918 B CN109459918 B CN 109459918B
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- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
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Abstract
Provided is an image forming apparatus including a main body and an extension substrate detachably provided to the main body, the main body including: a power supply unit; an image forming unit to which power is supplied from a power supply unit and form an image on a sheet; and a main board to which power is supplied from the power supply unit, the main board including: a USB function controller; a USB function connector having a first VBUS terminal and a first communication terminal electrically connected to the USB function controller, and a first ground terminal grounded, and connectable to a connector on one end side of a USB cable; and a first voltage input circuit for inputting a voltage having the same value as the terminal voltage to a first VBUS line electrically connecting the USB function controller and the first VBUS terminal, the expansion board including: a power supply terminal; a USB host controller; and a USB host connector having a second VBUS terminal electrically connected to the power supply terminal, a second communication terminal electrically connected to the USB host controller, and a second ground terminal grounded, and connectable to the connector on the other end side of the USB cable.
Description
Technical Field
The present invention relates to an image forming apparatus.
Background
Devices equipped with USB interfaces include host devices equipped with USB host controllers and functional devices equipped with USB function controllers. Be equipped with Type-A's USB connector at host computer equipment, be equipped with Type-B's USB connector at the functional equipment, the connector shape is different each other. By physically connecting the USB connector of the host device and the USB connector of the function device by using a USB cable, signals can be transmitted and received between the host device and the function device.
The USB cable is provided with a communication line (D +, D-), a power line (VBUS) and a ground line (GND). In the (on) phase of the physical connection between the USB connector of the host device and the USB connector of the functional device by the USB cable, a terminal voltage is applied by the host device to the USB function controller of the functional device through the power line. The USB function controller detects the terminal voltage and sends a signal to a USB host controller of the host device via a communication line. Thus, the USB host controller and the USB function controller can recognize that the host device and the function device are connected to each other via the USB cable.
Prior art documents
Patent document
Patent document 1: japanese laid-open patent publication No. 2009-205561
Disclosure of Invention
Problems to be solved by the invention
An extension board having a USB host controller and a Type-a USB connector may be provided in a printer main body having a USB function controller and a Type-B USB connector. In the configuration provided with the extension board, for example, it is conceivable that a USB connector of the printer main body and a USB connector of the extension board are physically connected by a USB cable, and the printer main body receives image data processed by the extension board via a communication line of the USB cable and prints an image related to the processed image data.
Unlike a host device such as a personal computer, the expansion board does not have a power supply driven by self power. Therefore, even if the USB connector connected to the USB function controller of the printer main body and the USB connector connected to the USB host controller of the extension board are physically connected by a USB cable, the extension board cannot apply the terminal voltage to the USB function controller of the printer main body. Therefore, the USB function controller cannot recognize that the USB cable is connected to the USB connector, and the USB host controller of the expansion board cannot recognize that the USB cable is connected to the USB host controller.
The invention aims to provide an image forming apparatus which can apply terminal voltage to a USB function connector of a main substrate connected with a USB host connector of an extension substrate through a USB cable even if the extension substrate without a power supply is arranged on a main body.
Means for solving the problems
In order to achieve the object, an image forming apparatus according to an aspect of the present invention includes: a main body; and an extension board detachably provided to the main body, the main body including: a power supply unit; an image forming unit configured to receive power from the power supply unit and form an image related to image data on a sheet; and a main board that receives power supply from the power supply unit, the main board including: a USB function controller; a USB function connector having a first VBUS terminal and a first communication terminal electrically connected to the USB function controller, and a first ground terminal grounded, and connectable to a connector on one end side of a USB cable; and a first voltage input circuit that inputs a voltage having the same value as a terminal voltage specified by USB specifications to a first VBUS line that electrically connects the USB function controller and the first VBUS terminal, and the extension board includes: a power supply terminal; a USB host controller; and a USB host connector having a second VBUS terminal electrically connected to the power supply terminal, a second communication terminal electrically connected to the USB host controller, and a second ground terminal that is grounded, and connectable to a connector on the other end side of the USB cable.
According to this configuration, the main substrate is provided with the USB function controller and the USB function connector. The USB functional connector has a first VBUS terminal, a first communication terminal and a first ground terminal. The first VBUS terminal and the first communication terminal are electrically connected with the USB function controller.
The extension substrate is provided with a power supply terminal, a USB host controller and a USB host connector. The USB host connector has a second VBUS terminal, a second communication terminal and a second ground terminal. The second VBUS terminal is electrically connected to the power supply terminal. The second communication terminal is electrically connected with the USB host controller.
A first voltage input circuit is provided on a main substrate. The first voltage input circuit inputs a voltage of the same value as a terminal voltage determined by the USB specification to a first VBUS line that electrically connects between the USB function controller and the first VBUS terminal. Therefore, even if the extension board without a power supply is provided in the main body, the terminal voltage, which is the voltage input to the first VBUS line, can be applied to the second VBUS terminal via the first VBUS terminal and the USB cable in a state where the USB function connector of the main board and the USB host connector of the extension board are connected via the USB cable. Also, the terminal voltage can be applied from the second VBUS terminal to the power supply terminal.
An image forming apparatus of another aspect of the present invention includes: a main body; and an extension board detachably provided to the main body, the main body including: a power supply unit; an image forming unit configured to receive power from the power supply unit and form an image related to image data on a sheet; and a main board that receives power supply from the power supply unit, the main board including: a USB function controller; and a USB function connector having a first VBUS terminal and a first communication terminal electrically connected to the USB function controller, and a first ground terminal grounded, and connectable to a connector on one end side of a USB cable, the expansion board including: a power supply terminal; a USB host controller; and a USB host connector having a second VBUS terminal electrically connected to the power supply terminal, a second communication terminal electrically connected to the USB host controller, and a second ground terminal grounded, and connectable to a connector on the other end side of the USB cable.
According to this configuration, the main substrate is provided with the USB function controller and the USB function connector. The USB functional connector has a first VBUS terminal, a first communication terminal, and a first ground terminal. The first VBUS terminal and the first communication terminal are electrically connected with the USB function controller.
The extension substrate is provided with a power supply terminal, a USB host controller and a USB host connector. The USB host connector has a second VBUS terminal, a second communication terminal and a second ground terminal. The second VBUS terminal is electrically connected to the power supply terminal. The second communication terminal is electrically connected with the USB host controller.
One end of a power supply line is connected to the power supply section of the main body, and the other end of the power supply line is connected to a power supply terminal of the extended substrate. Therefore, even if the extension board having no power supply is provided to the main body, the terminal voltage can be applied to the USB function connector of the main board connected to the USB host connector of the extension board via the USB cable.
Effects of the invention
According to the present invention, even if the extension board having no power supply is provided in the main body, the terminal voltage can be applied to the USB functional connector of the main board.
Drawings
Fig. 1 is a diagram showing an electrical configuration of a printer according to an embodiment of the present invention, and shows a state in which a PC is connected to the printer via an extension board.
Fig. 2 is a diagram showing an electrical configuration of the printer, and shows a state in which the printer is directly connected to a PC without an extension board.
Fig. 3 is a diagram showing an electrical configuration of the printer, and shows a state where a PC is not connected to the printer.
Fig. 4 is a diagram showing a detailed electrical configuration of the printer.
Fig. 5 is a flowchart showing the flow of the connection determination process.
Fig. 6 is a diagram showing an electrical configuration of a printer according to another embodiment of the present invention.
Detailed Description
Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
< Electrical Structure of Printer >
The printer 1 (an example of an image forming apparatus) shown in fig. 1 includes a main body 11 and an extension board support portion 13. In the printer 1, the extension board 12 can be mounted on the printer 1 by supporting the extension board 12 on the extension board support portion 13.
The main body 11 constitutes a housing of the printer 1. The main body 11 is provided with a power supply unit 21, an image forming unit 22, and a main board 23.
The power supply unit 21 is connected to a commercial ac power supply. The power supply unit 21 receives ac power from a commercial ac power supply and converts the ac power into dc power having a predetermined voltage value. The power supply unit 21 supplies the converted dc power to the image forming unit 22 and the main board 23, respectively.
The image forming unit 22 is a mechanism for printing a color image or a monochrome image related to image data on a sheet such as printing paper conveyed one by one in a conveyance path in the main body 11. The printing method may be an electrophotographic method or an inkjet method.
The main board 23 includes an ASIC31 (an example of a control circuit), a USB function connector 32, a ROM (not shown), a RAM (not shown), a first voltage input circuit 33, a second voltage input circuit 34, and a comparator circuit 35 (see fig. 4).
The ASIC31 incorporates a CPU, and the CPU executes a program stored in the ROM based on information input to the ASIC31, thereby executing various processes using the RAM as appropriate, and controlling the operation of the image forming unit 22.
Further, a USB function controller 41 for controlling data communication via the USB function connector 32 is embedded in the ASIC31.
The USB functional connector 32 is a Type-B USB connector, and is disposed so as to be exposed to the outside from the main body 11. The USB function connector 32 is electrically connected to the USB function controller 41 and the ground line of the main substrate 23.
The expansion board 12 includes a USB host connector 72, a USB host controller 73, a USB function connector 74, and a USB function controller 75.
The USB host connector 72 is a Type-a USB connector, and is provided on the extension substrate 12. The USB host connector 72 is electrically connected to a power supply terminal 71 and a USB host controller 73, which will be described later.
The USB cable 111 is a cable having one end with a shape corresponding to Type-B and the other end with a shape corresponding to Type-a.
One end of the USB cable 111 is connected to the USB function connector 32 of the main body 11, and the other end of the USB cable 111 is connected to the USB host connector 72 of the extension board 12.
The USB cable 116 is a cable having one end having a shape corresponding to Type-B and the other end having a shape corresponding to Type-a.
One end of the USB cable 116 is connected to the USB function connector 74 of the extension board 12, and the other end of the USB cable 116 is connected to the USB host connector 202 of the PC 2.
The PC2 transmits image data from the USB host controller 201 and the USB host connector 202 of the PC2 to the extension board 12 via the USB cable 116 and the USB function connector 74.
The extension substrate 12 performs image processing corresponding to the extension substrate 12 on the image data by an image processing unit (not shown) included in the extension substrate 12. The image processing corresponding to the extension board 12 is, for example, image processing customized for each user.
The extension board 12 transmits the image data after the image processing to the USB function connector 32 via the USB host controller 73, the USB host connector 72, and the USB cable 111.
The CPU of the ASIC31 stores the image data from the USB function connector 32 in the RAM on the main substrate 23 via the USB function controller 41. The CPU of the ASIC31 forms an image on a printing paper using the image forming unit 22 from the image data stored in the RAM on the main board 23.
As shown in fig. 2, when the PC2 is USB-connected to the printer 1 without the extension board 12, the USB host connector 202 of the PC2 and the USB function connector 32 of the printer 1 are connected to each other via the USB cable 117.
In this case, the PC2 directly transmits the image data from the USB host connector 202 of the PC2 to the USB function connector 32 via the USB cable 117.
In the case of USB connection, it is basically necessary to input a terminal voltage from the USB host side toward the USB function side. In the case of fig. 2, the PC2 is connected to a commercial power supply, and the terminal voltage can be applied from the USB host connector 202 of the PC2 to the USB function controller 41 via the USB function connector 32. Thus, the USB function controller 41 of the ASIC31 can recognize the USB connection to the PC 2.
In the case of fig. 1, power for driving the extension board 12 is required, and power supply from the printer 1 separately needs to be received. When USB connection is made between the USB host controller 73 and the USB function controller 41 via the USB cable 111, it is necessary to input a terminal voltage from the USB host controller 73 side via the VBUS terminal 46 described later in order to recognize the USB connection of the USB function controller 41. If the terminal voltage is not input, the USB function controller 41 of the ASIC31 cannot recognize whether or not the extension substrate 12 is connected.
The main board 23 includes a first voltage input circuit 33, a second voltage input circuit 34, and a comparator circuit 35, which will be described later. The CPU of the ASIC31 uses the second voltage input circuit 34 and the comparison circuit 35 to identify which of the cases of fig. 1, 2, and 3 is the case. In the first case, the first voltage input circuit 33 inputs a voltage having the same value as the terminal voltage determined by the USB specification to the USB function controller 41 and the extension board 12, respectively, so that the USB connection of the USB function controller 41 can be recognized and the extension board 12 can be driven by the input voltage.
Next, the electrical configurations of the main board 23 and the extension board 12, the first voltage input circuit 33, the second voltage input circuit 34, and the comparison circuit 35 will be described.
< Electrical Structure of Main substrate and extended substrate >
The printer 1 (an example of an image forming apparatus) shown in fig. 4 is a diagram showing an electrical configuration when the main body 11 and the extension board 12 are mounted.
The USB functional connector 32 includes a VBUS terminal 46 (an example of a first VBUS terminal), a D + communication terminal 47 (an example of a first communication terminal), a D-communication terminal 48 (an example of a first communication terminal), and a ground terminal 49 (an example of a first ground terminal). The VBUS terminal 46 is connected to the VBUS terminal 42 of the USB function controller 41 via a VBUS line 51 (an example of a first VBUS line). The D + communication terminal 47 is connected to the D + communication terminal 43 of the USB function controller 41 via a D + communication line 52. The D-communication terminal 48 is connected to the D-communication terminal 44 of the USB function controller 41 via a D-communication line 53. The ground terminal 49 is connected to a ground line of the main substrate 23.
The first voltage input circuit 33 includes a PNP transistor 56 (an example of a switching element). The power supply Voltage (VCC) supplied from the power supply unit 21 to the main board 23 is input to the emitter of the PNP transistor 56. The power supply voltage is 5V, which is the same value as the terminal voltage determined by the USB specification. A resistor 57 is interposed between the base and the emitter of the PNP transistor 56. The base of PNP transistor 56 is connected to ASIC31 via resistor 58. The collector of the PNP transistor 56 is connected to the VBUS line 51. When the base current is caused to flow from the ASIC31 to the PNP transistor 56 and the PNP transistor 56 is turned on, a current flows to the collector of the PNP transistor 56, and a voltage having the same value as the terminal voltage determined by the USB specification is input to the VBUS line 51.
Whether or not the ASIC31 applies a voltage to the base of the PNP transistor 56 is executed based on the result of a connection determination process executed by the CPU of the ASIC31 described later.
The "voltage having the same value as the terminal voltage" is not limited to a voltage that completely matches the terminal voltage, and includes a voltage that is lower than the terminal voltage by the saturation voltage between the collector and the emitter of the PNP transistor 56.
The second voltage input circuit 34 is constituted by a series circuit of a diode 61 and a resistor 62. The power supply Voltage (VCC) supplied from the power supply unit 21 to the main board 23 is input to the anode of the diode 61. One end of a resistor 62 is connected to the cathode of the diode 61, and the other end of the resistor 62 is connected to the VBUS line 51. The VBUS line 51 is connected to the ground line via a resistor 69. Thus, a voltage obtained by dividing the terminal voltage specified by the USB specification by the resistors 62 and 69, for example, 0.67V, is input from the second voltage input circuit 34 to the VBUS line 51. Note that, the case where 0.67V is input to the VBUS line 51 is a case where the extension board 12 is not connected to the USB function connector 32 via the USB cable 111.
The comparator circuit 35 has a positive input terminal 66, a negative input terminal 67, and an output terminal 68. A reference voltage (Vref) having a value lower than the terminal voltage determined by the USB specification is input to the positive input terminal 66. The reference voltage is, for example, 0.42V. The negative input terminal 67 is connected to the VBUS line 51. The output terminal 68 is connected to the ASIC31. Accordingly, when the voltage of the VBUS line 51 is higher than the reference voltage, a low-level signal is input from the output terminal 68 of the comparator circuit 35 to the ASIC31. On the other hand, when the voltage of the VBUS line 51 is lower than the reference voltage, a high-level signal is input from the output terminal 68 of the comparison circuit 35 to the ASIC31.
The extension board 12 includes a power supply terminal 71, a USB host connector 72, a USB host controller 73, a USB function connector 74, and a USB function controller 75.
The power supply terminal 71 is a terminal that functions as a power supply for supplying power to each part of the extension board 12 (the USB host connector 72, the USB host controller 73, and the image processing unit (not shown)).
The USB host connector 72 is a Type-a USB connector, and includes a VBUS terminal 76 (an example of a second VBUS terminal), a D + communication terminal 77 (an example of a second communication terminal), a D-communication terminal 78 (an example of a second communication terminal), and a ground terminal 79 (an example of a second ground terminal). The VBUS terminal 76 is connected to the power supply terminal 71 via a VBUS line 81 (an example of a second VBUS line). The ground terminal 79 is connected to a ground line of the extension substrate 12.
The USB host controller 73 has a D + communication terminal 82, a D-communication terminal 83, and a ground terminal 84. The D + communication terminal 82 is connected to the D + communication terminal 77 of the USB host connector 72 via a D + communication line 85. The D-communication terminal 83 is connected to the D-communication terminal 78 of the USB host connector 72 via a D-communication line 86. The ground terminal 84 is connected to a ground line of the extension substrate 12.
The USB functional connector 74 has a VBUS terminal 91, a D + communication terminal 92, a D-communication terminal 93, and a ground terminal 94. The ground terminal 94 is connected to a ground line of the extension substrate 12.
The USB function controller 75 has a VBUS terminal 95, a D + communication terminal 96, a D-communication terminal 97, and a ground terminal 98. The VBUS terminal 95 is connected to the VBUS terminal 91 of the USB function connector 74 via a VBUS line 101. The D + communication terminal 96 is connected to the D + communication terminal 92 of the USB functional connector 74 via a D + communication line 102. The D-communication terminal 97 is connected to the D-communication terminal 93 of the USB function connector 74 via a D-communication line 103. The ground terminal 98 is connected to a ground line of the extension substrate 12.
The extension board 12 includes a voltage drop circuit 106. The voltage drop circuit 106 includes a resistor 107, one end of which is connected to the VBUS line 81, and the other end of which is connected to the ground line of the extension board 12 via the resistor 107.
When the USB connector of Type-a of the USB cable 111 is connected to the PC2, the PC2 serves as a host device that actively operates with respect to the printer 1, and the printer 1 serves as a function device that passively operates with respect to an external device. The external device 2 serving as a host device is provided with a power supply.
The USB connector of Type-a of the USB cable 111 can be connected to the USB host connector 72 of the extension substrate 12. Fig. 4 shows the connection state. In this case, the VBUS terminal 46 of the USB function connector 32 and the VBUS terminal 76 of the USB host connector 72 are connected via a VBUS line 112 included in the USB cable 111. The D + communication terminal 47 of the USB functional connector 32 and the D + communication terminal 77 of the USB host connector 72 are connected via a D + communication line 113 included in the USB cable 111. Further, the D-communication terminal 48 of the USB function connector 32 and the D-communication terminal 78 of the USB host connector 72 are connected via a D-communication line 114 included in the USB cable 111. The ground terminal 49 of the USB functional connector 32 and the ground terminal 79 of the USB host connector 72 are connected to each other via a ground line 115 included in the USB cable 111.
< connection determination processing >
The external device 2 can be connected to the USB function connector 32 of the main board 23 via the USB cable 111, and the extension board 12 can be connected thereto. Therefore, the CPU included in the ASIC31 of the main board 23 executes the connection determination process shown in fig. 5 while the power of the printer 1 is on, in order to determine whether the extension board 12 is connected to the USB function connector 32, whether the PC2 is connected to the extension board, or whether nothing is connected.
In the connection determination process, the CPU determines whether a voltage of the same value as the terminal voltage determined by the USB specification, that is, 5V, is being input to the VBUS terminal 42 of the USB function controller 41 of the main substrate 23 (S1).
When the PC2 is directly connected to the USB function connector 32 via the USB cable 117 (in the case of fig. 2), the terminal voltage 5V is applied to the VBUS terminal 42 of the USB function controller 41 from the PC2 via the USB cable 117 and the USB function connector 32 (S1: yes). When detecting the terminal voltage, the USB function controller 41 starts negotiation for connection with the PC2 serving as the host device (S2).
In the negotiation, a signal is transmitted from the USB function controller 41 to the USB host controller 201 of the PC2 via the D + communication line 52 and the D-communication line 53. This signal is input to the USB host controller 201 of the PC2 via the D + communication line 113 and the D-communication line 114 of the USB cable 111. Thereby, it is recognized that the USB host controller 201 of the PC2 and the USB function controller 41 are connected to each other, and the interconnection based on the negotiation is completed (S3). When the mutual connection based on the negotiation is completed, the CPU ends the connection discrimination processing.
When the voltage of 5V, which is the same value as the terminal voltage, is not input to the VBUS terminal 42 of the USB function controller 41 (S1: no), the CPU checks the signal input from the comparison circuit 35 to the ASIC31 (S4).
When the high-level signal is not input from the comparison circuit 35 to the ASIC31 (S4: no), that is, when the low-level signal is being input from the comparison circuit 35 to the ASIC31, the voltage of the VBUS line 51 of the main board 23 is higher than the reference voltage. In this case, the CPU recognizes that nothing is connected to the USB function connector 32, and determines whether or not 5V is being input to the VBUS terminal 42 of the USB function controller 41 again (S1).
When the extension board 12 is connected to the USB function connector 32 via the USB cable 111 (fig. 1 and 4), the VBUS line 51 of the main board 23 and the VBUS line 81 of the extension board 12 are connected via the VBUS line 112 of the USB cable 111. Therefore, a current based on the voltage (for example, 0.67V) input from the second voltage input circuit 34 of the main board 23 to the VBUS line 51 flows in the voltage drop circuit 106 of the extension board 12, and the voltage of the VBUS lines 51, 81, 112 drops from 0.67V to a voltage lower than the reference voltage, for example, 0.2V. Therefore, the voltage input to the negative input terminal 67 of the comparator circuit 35 is lower than the reference voltage input to the positive input terminal 66, and a high-level signal is input from the output terminal 68 of the comparator circuit 35 to the ASIC31.
When the extension board 12 is not connected to the USB functional connector 32 via the USB cable 111 (fig. 3), 0.67V, which is a voltage input from the second voltage input circuit 34 of the main board 23 to the VBUS line 51, is input to the negative input terminal 67 of the comparator circuit 35. Then, the voltage input to the negative input terminal 67 of the comparator circuit 35 becomes higher than the reference voltage input to the positive input terminal 66, and a low-level signal is input from the output terminal 68 of the comparator circuit 35 to the ASIC31.
When a low-level signal is being input from the comparison circuit 35 to the ASIC31 (S4: no), the process returns to S1.
When a high level signal is being input from the comparator circuit 35 to the ASIC31 (S4: yes), the CPU inputs a voltage to the base of the PNP transistor 56 of the first voltage input circuit 33 to turn on the PNP transistor 56 (S5). When the PNP transistor 56 is turned on, a current flows to the collector of the PNP transistor 56, and 5V, which is the same value as the terminal voltage determined by the USB specification, is input to the VBUS line 51.
Since the VBUS line 51 and the VBUS line 81 of the extension substrate 12 are connected via the VBUS line 112 of the USB cable 111, when 5V is input to the VBUS line 51, 5V is applied to the power supply terminal 71 of the extension substrate 12 via the VBUS lines 81 and 112. Thereby, the drive power is supplied from the power supply terminal 71 to the USB host controller 73 of the extension board 12, and the USB host controller 73 is started.
When 5V is input to the VBUS line 51, 5V is applied as a terminal voltage to the VBUS terminal 42 of the USB function controller 41. When detecting the terminal voltage (S6: yes), the USB function controller 41 starts negotiation with the USB host controller 73 of the extension board 12 for connection of the main board 23 and the extension board 12 (S2). When the mutual connection based on the negotiation is completed (S3), the CPU ends the connection determination process.
< Effect >
As described above, the USB function controller 41 and the USB function connector 32 are provided on the main substrate 23. The USB function connector 32 has a VBUS terminal 46, a D + communication terminal 47, a D-communication terminal 48, and a ground terminal 49. The VBUS terminal 46, the D + communication terminal 47 and the D-communication terminal 48 are electrically connected to the USB function controller 41.
The extension board 12 is provided with a power supply terminal 71, a USB host connector 72, and a USB host controller 73. The USB host connector 72 has a VBUS terminal 76, a D + communication terminal 77, a D-communication terminal 78, and a ground terminal 79. The VBUS terminal 76 is electrically connected to the power supply terminal 71. The D + communication terminal 77 and the D-communication terminal 78 are electrically connected to the USB host controller 73.
The main board 23 is provided with a first voltage input circuit 33. The first voltage input circuit 33 inputs a voltage having the same value as a terminal voltage determined by the USB specification to the VBUS line 51 that electrically connects the USB function controller 41 and the VBUS terminal 46. Therefore, even if the extension board 12 not provided with a power supply is provided in the main body 11, in a state where the USB function connector 32 of the main board 23 and the USB host connector 72 of the extension board 12 are connected via the USB cable 111, a voltage having the same value as the terminal voltage, which is the voltage input to the VBUS line 51, can be applied to the VBUS terminal 76 of the extension board 12 via the VBUS terminal 46 and the USB cable 111. Further, a voltage having the same value as the terminal voltage can be applied from the VBUS terminal 76 to the power supply terminal 71. The USB host controller 73 of the extension board 12 can operate using the voltage applied to the power supply terminal 71.
In the case of the present embodiment, when the power from the power supply unit 21 of the printer 1 is supplied to the extension board 12, the power can be supplied to the extension board 12 via the USB cable 111, and therefore, it is not necessary to separately provide a power line.
The main board 23 includes an ASIC31, a second voltage input circuit 34, and a comparator circuit 35. The second voltage input circuit 34 inputs a voltage (for example, 0.67V) lower than the terminal voltage determined by the USB specification to the VBUS line 51. On the other hand, the extension board 12 includes a voltage drop circuit 106. The voltage drop circuit 106 has one end connected to the VBUS line 81 that electrically connects the power supply terminal 71 and the VBUS terminal 76, and the other end grounded via a resistor 107. Therefore, when the extension board 12 is connected to the USB functional connector 32 via the USB cable 111, a current based on the voltage input from the second voltage input circuit 34 to the VBUS line 51 flows in the voltage drop circuit 106, and the voltage of the VBUS lines 51, 81, and 112 drops to a voltage lower than the reference voltage. Therefore, the voltage input to the negative input terminal 67 of the comparator 35 becomes lower than the reference voltage input to the positive input terminal 66, and a high-level signal is input from the output terminal 68 of the comparator 35 to the ASIC31. Therefore, the CPU incorporated in the ASIC31 can recognize that a device (host device) not having a power supply, such as the expansion board 12, is connected to the USB functional connector 32, by inputting a high-level signal from the comparator circuit 35 to the ASIC31 in a state where a voltage having the same value as the terminal voltage specified by the USB specification is not input to the VBUS line 51.
The CPU of the ASIC31 receives the input of the high level signal to turn on the PNP transistor 56 of the first voltage input circuit 33. By turning on the PNP transistor 56, a voltage having the same value as the terminal voltage specified by the USB specification can be input to the VBUS line 51.
When the external device 2 is connected to the USB function connector 32 via the USB cable 111 (the case of fig. 2), 5V as a terminal voltage is applied to the VBUS terminal 42 of the USB function controller 41. Therefore, in a state where the PNP transistor 56 is off, 5V is input to the VBUS terminal 46. Therefore, the CPU of the ASIC31 can recognize that the external device 2, which is the host device having a power supply, is connected to the USB function connector 32 via the USB cable 111. In this case, the PNP transistor 56 of the first voltage input circuit 33 is kept off.
Since the voltage input from the second voltage input circuit 34 to the VBUS line 51 is higher than the reference voltage, the voltage of the VBUS line 51 of the main board 23 is higher than the reference voltage in a state where nothing is connected to the USB functional connector 32, and a low level signal is input from the comparison circuit 35 to the ASIC31. The CPU of the ASIC31 can recognize that nothing is connected to the USB function connector 32 by inputting a low-level signal from the comparator circuit 35 to the ASIC31. In this case, the PNP transistor 56 of the first voltage input circuit 33 is also kept off.
< other embodiment >
Fig. 6 is a diagram showing an electrical configuration of the printer 1 according to another embodiment of the present invention. In fig. 6, the same reference numerals as those of the above-described portions are assigned to portions corresponding to those shown in fig. 4. Note that, in the following description, the description of the portions to which the same reference numerals are given is omitted, and only the differences from the configuration shown in fig. 4 will be described with respect to the configuration shown in fig. 6.
In the printer 1 having the configuration shown in fig. 6, the first voltage input circuit 33, the second voltage input circuit 34, and the comparison circuit 35 shown in fig. 4 are omitted from the main board 23, and the voltage drop circuit 106 shown in fig. 1 is omitted from the extension board 12. One end of a power supply line 121 is connected to the power supply unit 21 of the main body 11. The other end of the power supply line 121 is connected to the relay substrate 122. One end of the power supply line 123 is connected to the relay substrate 122, and the other end of the power supply line 123 is connected to the power supply terminal 71 of the extension substrate 12.
In the configuration shown in fig. 3, a voltage having the same value as the terminal voltage specified by the USB specification can be supplied from the power supply unit 21 to the power supply terminal 71 of the extended substrate 12 via the power supply line 121, the relay substrate 122, and the power supply line 123. Then, the voltage can be input from the power supply terminal 71 to the VBUS terminal 76 of the USB host connector 72 of the extension board 12 via the VBUS line 81. Thereby, a voltage having the same value as the terminal voltage can be input to the USB function connector 32 of the main board 23 connected to the USB host connector 72 of the extension board 12 via the USB cable 111.
Even if the extension board 12 without a power supply is provided to the main body 11 via the extension board support portion 13, a terminal voltage can be applied to the USB function controller 41 of the main board 23 via the USB function connector 32, and the USB function connector 32 is connected to the USB host connector 72 of the extension board 12 via the USB cable 111.
According to this configuration, the USB function controller 41 of the main board 23 can recognize that the extension board 12 and the main board 23 are USB-connected, based on the voltage supplied from the power supply terminal 71 of the extension board 12 via the power supply line 123.
< modification example >
Although two embodiments of the present invention have been described above, the present invention may be implemented in other embodiments.
For example, in the above-described embodiment, the printer 1 is used as an example of the image forming apparatus, but the present invention is not limited to the printer 1, and can be applied to a multifunction peripheral having a function such as an image reading function of reading an image of a document in addition to an image forming function of forming an image on a sheet such as a printing sheet.
Although a circuit having a USB function controller in the ASIC31 is exemplified, the USB function controller may be external to the ASIC31.
In addition, various design changes can be made to the above-described configuration within the scope of the items described in the claims.
Claims (7)
1. An image forming apparatus includes:
a main body; and
an extension substrate detachably provided to the main body,
the main body is provided with:
a power supply unit;
an image forming unit configured to receive power from the power supply unit and form an image related to image data on a sheet; and
a main board receiving power supply from the power supply unit,
the main substrate includes:
a USB function controller;
a USB functional connector having a first VBUS terminal and a first communication terminal electrically connected to the USB functional controller, and a first ground terminal grounded, and connectable to a connector on one end side of a USB cable; and
a first voltage input circuit inputting a voltage having the same value as a terminal voltage determined by a USB specification to a first VBUS line electrically connecting the USB function controller and the first VBUS terminal,
the extension substrate includes:
a power supply terminal;
a USB host controller; and
and a USB host connector having a second VBUS terminal electrically connected to the power supply terminal, a second communication terminal electrically connected to the USB host controller, and a second ground terminal connected to ground, and connectable to a connector on the other end side of the USB cable.
2. The image forming apparatus according to claim 1,
the main substrate includes:
the control circuit is an integrated circuit embedded with the USB function controller;
a second voltage input circuit that inputs a predetermined voltage smaller than the terminal voltage to the first VBUS line; and
a comparison circuit that compares a voltage of the first VBUS line with a reference voltage and outputs a signal indicating a result of the comparison to the control circuit,
the extension board includes a voltage drop circuit having one end connected to a second VBUS line electrically connecting the power supply terminal and the second VBUS terminal, and the other end grounded via a resistor,
the first voltage input circuit includes a switching element that is turned on and off according to an instruction from the control circuit in order to switch the input of the terminal voltage to the first VBUS line and the stop thereof.
3. The image forming apparatus according to claim 2,
when the voltage of the first VBUS terminal is a voltage having the same value as the terminal voltage in a state where the switching element is off, the control circuit determines that a host device having a power supply is connected to the USB function connector via the USB cable.
4. The image forming apparatus according to claim 3,
the reference voltage is set to a voltage that is lower than the predetermined voltage and equal to or higher than zero,
when a signal indicating that the voltage of the first VBUS line is larger than the reference voltage is output from the comparison circuit in a state where the switching element is off, the control circuit determines that the USB cable is not connected to the USB function connector.
5. The image forming apparatus according to claim 4,
when the comparison circuit outputs a signal indicating that the voltage of the first VBUS line is smaller than the reference voltage in a state where the switching element is off, the control circuit determines that a host device having no power supply is connected to the USB function connector via the USB cable.
6. The image forming apparatus according to claim 5,
the control circuit switches the switching element from off to on in a case where the USB function controller decides that a host device having no power supply is connected to the USB function connector via the USB cable,
the USB host controller operates using power input to the power supply terminal.
7. The image forming apparatus according to claim 6,
the USB function connector is disposed so as to be exposed to the outside of the main body.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310032048.XA CN115903418A (en) | 2017-09-06 | 2018-09-04 | Image forming apparatus with a toner supply device |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2017170891A JP2019046343A (en) | 2017-09-06 | 2017-09-06 | Image forming apparatus |
| JP2017-170891 | 2017-09-06 |
Related Child Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202310032048.XA Division CN115903418A (en) | 2017-09-06 | 2018-09-04 | Image forming apparatus with a toner supply device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN109459918A CN109459918A (en) | 2019-03-12 |
| CN109459918B true CN109459918B (en) | 2023-01-31 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202310032048.XA Pending CN115903418A (en) | 2017-09-06 | 2018-09-04 | Image forming apparatus with a toner supply device |
| CN201811024272.XA Active CN109459918B (en) | 2017-09-06 | 2018-09-04 | Image forming apparatus with a toner supply device |
Family Applications Before (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202310032048.XA Pending CN115903418A (en) | 2017-09-06 | 2018-09-04 | Image forming apparatus with a toner supply device |
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| Country | Link |
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| JP (1) | JP2019046343A (en) |
| CN (2) | CN115903418A (en) |
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Also Published As
| Publication number | Publication date |
|---|---|
| CN115903418A (en) | 2023-04-04 |
| CN109459918A (en) | 2019-03-12 |
| JP2019046343A (en) | 2019-03-22 |
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