Control device and image processing apparatus

Abstract

To provide a control device and an image processing apparatus which hardly cause malfunction of a device.SOLUTION: A control device 17 includes a signal generation unit 41, a signal output unit 42, and a power supply control unit 43. The signal generation unit 41 outputs a first signal Si1 from an output terminal 410. The signal output unit 42 includes an input terminal 420 to which the first signal Si1 is inputted, and outputs a control signal corresponding to the first signal Si1. The power source control unit 43 controls a second power source Vcc2 for driving the signal output unit 42 provided separately from a first power source Vcc1 for driving the signal generation unit 41, and stops supply of power from the second power source Si2 to the signal output unit 42 in accordance with a second signal Si2 from the outside.SELECTED DRAWING: Figure 4

Description

Technical Field

[0001] The present invention relates to a control device and an image processing device.

Background Art

[0002] As related art, a control device (data transfer processing device) that performs data communication between input / output buffers driven by power supplies respectively supplied from different power sources via a predetermined communication medium and used in a copying machine or the like is known (see, for example, Patent Document 1).

[0003] The control device according to the related art transfers data between an output buffer driven by a first power supply voltage supplied from a first power supply and an input buffer driven by a second power supply voltage supplied from a second power supply. This control device includes first buffer control means. The first buffer control means detects a change state of the second power supply voltage supplied from the second power supply and controls a change in the output level of the output buffer. In this control device, when transferring data, by capturing a change in the power supply voltage and controlling the digital output of the output buffer, it is possible to prevent an overcurrent from flowing into the input / output buffer due to a change in one of the power supply voltages.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0005] In the configuration of the related art described above, for example, at the time of power-on or the like, the transmission source (output buffer) of a signal (data) may be reset. At that time, the input terminal of the signal transmission destination (input buffer) becomes high impedance, which may lead to malfunction of the device subsequent to the input buffer.

[0006] An object of the present invention is to provide a control device and an image processing device that are less likely to cause malfunction of a device.

Means for Solving the Problems

[0007] A control device according to one aspect of the present invention includes a signal generation unit, a signal output unit, and a power supply control unit. The signal generation unit outputs a first signal from an output terminal. The signal output unit has an input terminal to which the first signal is input, and outputs a control signal according to the first signal. The power supply control unit controls a second power supply for driving the signal output unit provided separately from the first power supply for driving the signal generation unit, and stops power supply from the second power supply to the signal output unit according to a second signal from the outside.

[0008] An image processing device according to another aspect of the present invention includes the control device and a main body having an image processing function.

Effects of the Invention

[0009] According to the present invention, it is possible to provide a control device and an image processing device that are less likely to cause malfunction of a device.

Brief Description of the Drawings

[0010]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Figure 7

Embodiments for Carrying Out the Invention

[0011] Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings. The following embodiments are an example of embodying the present invention and are not intended to limit the technical scope of the present invention.

[0012] (Embodiment 1) [1] Overall Configuration of Image Processing Apparatus First, with reference to FIGS. 1 and 2, the overall configuration of the image processing apparatus 10 according to the present embodiment will be described.

[0013] The image processing apparatus 10 according to the present embodiment is, as an example, a multifunction device having a plurality of functions such as a scan function for acquiring image data from a document, a print function for forming an image based on the image data, a facsimile function, and a copy function. The image processing apparatus 10 only needs to have an image processing function including at least one of a function for forming an image and a function for acquiring image data, and may be a printer, a scanner, a facsimile apparatus, a copy machine, or the like.

[0014] As shown in FIG. 1, the image processing apparatus 10 includes an automatic document feeder 11, an image reading unit 12, an image forming unit 13, a paper feeding unit 14, a display unit 15, an operation unit 16, a control device 17, and a power supply unit 18. Since the automatic document feeder 11 is an ADF (Auto Document Feeder), it is denoted as "ADF" in FIG. 1 and is also referred to as "ADF11" in the following description. In the present embodiment, as shown in FIG. 2, the image processing apparatus 10 includes a main body 101. The ADF11, the image reading unit 12, the image forming unit 13, the paper feeding unit 14, the display unit 15, the operation unit 16, the control device 17, and the power supply unit 18 are provided in the main body 101.

[0015] The ADF11 conveys the document on which an image is read by the image reading unit 12. The ADF11 includes a document set unit, a plurality of conveyance rollers, a document holder, a paper discharge unit, and the like.

[0016] The image reading unit 12 reads an image from the document and outputs image data corresponding to the read image. The image reading unit 12 includes a document table, a light source, a plurality of mirrors, an optical lens, a CCD (Charge Coupled Device), and the like.

[0017] The image forming unit 13 forms an image on a sheet by an electrophotographic method based on the image data output from the image reading unit 12. Also, the image forming unit 13 forms an image on a sheet based on the image data input from an information processing device external to the image processing apparatus 10, such as a personal computer. The image forming unit 13 includes four image forming units corresponding to four colors of C (cyan), M (magenta), Y (yellow), and K (black), a laser scanning device, an intermediate transfer belt, a secondary transfer roller, a fixing device, and the like. The image forming unit 13 may be configured to form an image on a sheet by an image forming method other than the electrophotographic method, such as an inkjet method.

[0018] The image forming unit 13 forms an image on a sheet using toner as a developer. When the image forming unit 13 forms an image by an inkjet method, ink (another example of a developer) is supplied instead of toner. As the toner supplied to the image forming unit 13, there are, for example, toners of a plurality of colors of C (cyan), M (magenta), Y (yellow), and K (black). The sheet after image formation in the image forming unit 13 is discharged (supplied) to an expansion device or the like for post-processing.

[0019] The paper feeding unit 14 supplies sheets to the image forming unit 13. The paper feeding unit 14 includes a paper feed cassette, a manual feed tray, a sheet conveyance path, a plurality of conveyance rollers, and the like. In this embodiment, the paper feeding unit 14 has a plurality of paper feeding sources (including two or more paper feed cassettes and a manual feed tray). The image forming unit 13 forms an image on the sheet supplied from the paper feeding unit 14. The sheet supplied to the image forming unit 13 is, for example, paper, but is not limited to paper, and may be, for example, a resin film or the like.

[0020] The display unit 15 is a user interface for presenting (displaying) information to the user in the image processing apparatus 10. The display unit 15 displays various information according to a control instruction from the control device 17. In this embodiment, as an example, the display unit 15 includes a liquid crystal display, and displays a display screen including various information on the liquid crystal display.

[0021] The operation unit 16 is, for example, a user interface for receiving user operation inputs for the display screen displayed on the display unit 15. The operation unit 16 receives various operations by the user, for example, by outputting an electrical signal according to the user's operation. In this embodiment, as an example, the operation unit 16 has a switch or a touch panel or the like.

[0022] In addition, the image processing apparatus 10 may include, for example, a voice output unit and a voice input unit as user interfaces in addition to or instead of the display unit 15 and the operation unit 16.

[0023] The control device 17 is mainly composed of a computer system having one or more processors and one or more memories, and comprehensively controls the image processing apparatus 10. In the image processing apparatus 10, the functions of the control device 17 are realized by one or more processors executing a program. In this embodiment, as an example, the control device 17 includes a CPU (Central Processing Unit).

[0024] The program may be pre-recorded in one or more memories, may be provided through an electrical communication line such as the Internet, or may be provided by being recorded on a non-transitory recording medium readable by a computer system, such as a memory card or an optical disk. The one or more processors are composed of one or more electronic circuits including semiconductor integrated circuits. Further, the computer system referred to herein includes a microcontroller having one or more processors and one or more memories. The control device 17 may be a control unit provided separately from the main control unit that overall controls the image processing device 10.

[0025] Specifically, the control device 17 controls each device by transmitting (outputting) a control signal to each device such as the ADF 11, the image reading unit 12, the image forming unit 13, the paper feeding unit 14, and the display unit 15. For example, the control device 17 outputs a PF (Paper Feeder) selection signal and a clock signal as control signals to the paper feeding unit 14. The PF selection signal is a control signal for selecting a paper feeding source, and the clock signal is a control signal for specifying the timing for feeding a sheet to the paper feeding unit 14. Thereby, the control device 17 can feed paper from an arbitrary paper feeding source at an arbitrary timing among a plurality of paper feeding sources (including two or more paper cassettes and a manual feed tray) in the paper feeding unit 14.

[0026] The power supply unit 18 is a device that generates (outputs) electric power for the operation of the image processing device 10. The power supply unit 18 is electrically connected to one or more electrical loads and supplies electric power to the one or more electrical loads. In the present embodiment, the main body 101 of the image processing device 10 serves as an “electrical load”, and the power supply unit 18 supplies electric power to each part of the main body 101 as an electrical load. That is, the one or more electrical loads supplied with electric power from the power supply unit 18 include the ADF 11, the image reading unit 12, the image forming unit 13, the paper feeding unit 14, the display unit 15, the operation unit 16, and the control device 17.

[0027] In this embodiment, the power supply unit 18 is electrically connected to an AC plug, and converts an AC voltage of 100V (or 200V) applied to the AC plug into, for example, a DC voltage of 24V and a DC voltage of 3.3V (or 5V). That is, when the AC plug is connected to an outlet (socket), AC power is applied to the power supply unit 18 from an AC power source such as a mains power supply, so the power supply unit 18 generates DC power from this AC power.

[0028] In addition, the image processing apparatus 10 further includes a storage unit, a communication unit, and the like. The storage unit includes one or more non-volatile memories, and stores in advance information such as a control program for causing the control device 17 to execute various processes. The communication unit is an interface that executes data communication between the image processing apparatus 10 and an external device connected via a communication network such as the Internet or a LAN (Local Area Network).

[0029] [2] Configuration related to transmission of control signals Next, the configuration related to the transmission of control signals will be described in more detail with reference to FIGS. 3 to 6.

[0030] As described above, the image processing apparatus 10 according to this embodiment controls a device such as the paper feed unit 14 by transmitting (outputting) control signals such as a PF selection signal and a clock signal from the control device 17 to the device. That is, the paper feed unit 14 is an example of a device controlled by a control signal, and the PF selection signal and the clock signal are examples of control signals.

[0031] Hereinafter, it is assumed that the control signals are the first PF selection signal Si11 and the second PF selection signal Si12. The first PF selection signal Si11 and the second PF selection signal Si12 are voltage signals whose voltage values change between H (High) level and L (Low) level respectively. And the device (paper feeding unit 14) does not select any paper feeding source when both the first PF selection signal Si11 and the second PF selection signal Si12 are at the H level. The device (paper feeding unit 14) selects the first paper feeding source when the first PF selection signal Si11 is at the H level and the second PF selection signal Si12 is at the L level, and selects the second paper feeding source when the first PF selection signal Si11 is at the L level and the second PF selection signal Si12 is at the H level.

[0032] As shown in FIG. 3, the image processing apparatus 10 according to the present embodiment includes a first substrate (Engine substrate) 21 that is a transmission source of a control signal, and a second substrate (PF substrate) 22 that is a transmission destination of the control signal. A control device 17 is mounted on the first substrate 21, and a device control unit 141 included in devices such as the paper feeding unit 14 is mounted on the second substrate 22. Further, a signal transmission circuit 3 is mounted on the second substrate 22. The first substrate 21 and the second substrate 22 are electrically connected by a signal line 23 that serves as a transmission path for a control signal (here, the first PF selection signal Si11 and the second PF selection signal Si12).

[0033] Thus, the control device 17 according to the present embodiment constitutes the image processing apparatus 10 together with the main body 101 having an image processing function. In other words, the image processing apparatus 10 includes the control device 17 and the main body 101 having an image processing function.

[0034] According to this configuration, the control signals (here, the first PF selection signal Si11 and the second PF selection signal Si12) output by the control device 17 on the first substrate 21 are transmitted through the signal line 23 to the signal transmission circuit 3 on the second substrate 22. The signal transmission circuit 3 transmits the input control signal to the device control unit 141. Thereby, the device control unit 141 operates devices such as the paper feeding unit 14 according to the control signal.

[0035] Here, the control device 17 includes a signal generation unit 41 and a signal output unit 42. The signal generation unit 41 generates a first signal Si1 (see FIG. 4). The signal output unit 42 outputs control signals (here, a first PF selection signal Si11 and a second PF selection signal Si12) corresponding to the first signal Si1.

[0036] In this embodiment, the signal generation unit 41 is configured by a CPU. That is, in this embodiment, as an example, the first signal Si1 is a "PF_CS signal", and the output terminal 410 (see FIG. 4) that outputs the first signal Si1 in the signal generation unit 41 is the "PF_CS terminal" of the CPU.

[0037] The signal output unit 42 has an input terminal 420 (see FIG. 4) and transistors Tr1, Tr2, Tr3 (see FIG. 6), etc. According to whether the first signal Si1 input to the input terminal 420 from the signal generation unit 41 is at the H level or the L level, the first PF selection signal Si11 and the second PF selection signal Si12 are output. In this embodiment, as an example, if the first signal Si1 is at the H level, the first PF selection signal Si11 is at the H level and the second PF selection signal Si12 is at the L level. If the first signal Si1 is at the L level, the first PF selection signal Si11 is at the L level and the second PF selection signal Si12 is at the H level (see FIG. 5).

[0038] However, in this configuration, for example, when the image processing apparatus 10 is powered on, the signal generation unit 41 composed of the CPU is reset, and during this reset operation, the input terminal 420 of the signal output unit 42 may become high impedance. When the input terminal 420 of the signal output unit 42 becomes high impedance, both the first PF selection signal Si11 and the second PF selection signal Si12 become the L level. In this case, it is not assumed that both the first PF selection signal Si11 and the second PF selection signal Si12 become the L level, which may lead to malfunction of the device (paper feeding unit 14).

[0039] Incidentally, as related art, a control device (data transfer processing device) that performs data communication between input / output buffers driven by power supplies respectively supplied from different power sources via a predetermined communication medium and is used in a copying machine or the like is known.

[0040] The control device according to the related art transfers data between an output buffer driven by a first power supply voltage supplied from a first power supply and an input buffer driven by a second power supply voltage supplied from a second power supply. This control device includes first buffer control means. The first buffer control means detects a change state of the second power supply voltage supplied from the second power supply and controls a change in the output level of the output buffer. In this control device, when transferring data, by capturing the fluctuation of the power supply voltage and controlling the digital output of the output buffer, it is possible to prevent an overcurrent from flowing into the input / output buffer due to the fluctuation of one power supply voltage.

[0041] In the configuration of the above related art, for example, at the time of power-on or the like, the signal (data) transmission source (output buffer) may be reset. At this time, the input terminal of the signal destination (input buffer) becomes high impedance, which may lead to malfunction of the device subsequent to the input buffer.

[0042] On the other hand, in the present embodiment, a control device 17 and an image processing device 10 that are less likely to cause malfunction of the device are realized by the configuration described below.

[0043] That is, as shown in FIG. 4, the control device 17 according to the present embodiment includes a signal generation unit 41, a signal output unit 42, and a power supply control unit 43. The signal generation unit 41 outputs a first signal Si1 from an output terminal 410. The signal output unit 42 has an input terminal 420 to which the first signal Si1 is input, and outputs control signals (a first PF selection signal Si11 and a second PF selection signal Si12) corresponding to the first signal Si1. The power supply control unit 43 controls a second power supply Vcc2 for driving the signal output unit 42 provided separately from a first power supply Vcc1 for driving the signal generation unit 41, and stops the power supply from the second power supply Vcc2 to the signal output unit 42 according to a second signal Si2 from the outside.

[0044] According to this configuration, the control device 17 can stop the power supply from the second power supply Vcc2 to the signal output unit 42 according to the second signal Si2 from the outside (of the power supply control unit 43), and forcibly stop the operation of the signal output unit 42. By stopping the operation of the signal output unit 42, even if the input terminal 420 of the signal output unit 42 becomes high impedance, it is possible to avoid the signal output unit 42 from outputting an error value as the control signals (the first PF selection signal Si11 and the second PF selection signal Si12). Therefore, according to this control device 17, there is an advantage that it is difficult to cause a malfunction of the device (the paper feeding unit 14) due to the input terminal 420 of the signal output unit 42 becoming high impedance.

[0045] That is, the control device 17 has a first power supply Vcc1 for driving the signal generation unit 41 and a second power supply Vcc2 for driving the signal output unit 42 provided separately, and includes a power supply control unit 43 that controls at least the second power supply Vcc2, so that it is possible to make it difficult to cause a malfunction of the device.

[0046] In short, when the signal output unit 42 is operating, as shown in the upper part of FIG. 5, when the input terminal 420 (INPUT) of the signal output unit 42 becomes high impedance (Hi-Z), both the first PF selection signal Si11 and the second PF selection signal Si12 are in an unexpected state of L level. Therefore, the control device 17 according to the present embodiment forcibly stops the operation of the signal output unit 42 from the second power supply Vcc2 by the power supply control unit 43, so that as shown in the lower part of FIG. 5, even when the input terminal 420 (INPUT) of the signal output unit 42 becomes high impedance (Hi-Z), both the first PF selection signal Si11 and the second PF selection signal Si12 can be set to H level. Thereby, malfunction of the device (paper feeding unit 14) is less likely to occur.

[0047] More specifically, the second signal Si2 is a reset signal input to the signal generation unit 41 to reset the signal generation unit 41. That is, the signal generation unit 41 has a reset (RESET) terminal 411 for inputting a reset signal as the second signal Si2. Therefore, for example, when the image processing apparatus 10 is powered on, the signal generation unit 41 is reset when the second signal Si2, which is a reset signal, becomes L level. At this time, the power supply control unit 43 controls the second power supply Vcc2 to stop the power supply from the second power supply Vcc2 to the signal output unit 42 according to the second signal Si2, which is a reset signal.

[0048] According to this configuration, during the reset operation of the signal generation unit 41 (CPU), which is the transmission source of the first signal Si1, the operation of the signal output unit 42 can be stopped. Thereby, even during the reset operation of the signal generation unit 41 (CPU), it is possible to avoid the signal output unit 42 from outputting an error value as a control signal (first PF selection signal Si11 and second PF selection signal Si12), and malfunction of the device (paper feeding unit 14) is less likely to occur.

[0049] FIG. 6 shows a specific example of the control device 17 and the signal transmission circuit 3 according to the present embodiment.

[0050] That is, the CPU as the signal generation unit 41 has a "PF_CS terminal" as an output terminal 410 for outputting the first signal Si1 (PF_CS signal), a reset terminal 411 for inputting the second signal Si2 (reset signal), and a "TCONT_RESET terminal" as a control terminal 412 for outputting the third signal Si3 (TCONT_RESET signal). The CPU as the signal generation unit 41 operates with a power supply voltage (3.3V as an example) applied from a first power supply Vcc1 composed of a constant voltage source.

[0051] The signal output unit 42 includes resistors R1 to R6, transistors Tr1, Tr2, Tr3, a first output terminal 421 for outputting a first PF selection signal Si11, and a second output terminal 422 for outputting a second PF selection signal Si12. The transistor Tr1 is a pnp bipolar transistor. The transistors Tr2 and Tr3 are npn bipolar transistors.

[0052] The resistors R1, R2, R3, and R4 are electrically connected in series between a second power supply Vcc2 composed of a constant voltage source and a circuit ground. The emitter of the transistor Tr1 is connected to the second power supply Vcc2, and the emitter of the transistor Tr2 is connected to the circuit ground. The resistor R1 is electrically connected between the base and emitter of the transistor Tr1. The resistor R4 is electrically connected between the base and emitter of the transistor Tr2. The connection point between the resistor R2 and the resistor R3 constitutes the input terminal 420. In other words, the resistor R2 is electrically connected between the base of the transistor Tr1 and the input terminal 420, and the resistor R3 is electrically connected between the base of the transistor Tr2 and the input terminal 420.

[0053] The resistors R5 and R6 are electrically connected in series between the collector of the transistor Tr1 and the circuit ground. The emitter of the transistor Tr3 is connected to the circuit ground. The resistor R6 is electrically connected between the base and emitter of the transistor Tr3. The resistor R5 is electrically connected between the collector of the transistor Tr1 and the base of the transistor Tr3.

[0054] The first output terminal 421 is electrically connected to the collector of the transistor Tr3. The second output terminal 422 is electrically connected to the collector of the transistor Tr2. Further, the first output terminal 421 and the second output terminal 422 are electrically connected to the third power supply (constant voltage source) Vcc3 of the signal transmission circuit 3.

[0055] The signal transmission circuit 3 includes a buffer 31. The buffer 31 is electrically connected to the first output terminal 421 and the second output terminal 422. As a result, the first PF selection signal Si11 and the second PF selection signal Si12 are input to the buffer 31 from the first output terminal 421 and the second output terminal 422.

[0056] With such a configuration, as shown in FIG. 5, when the input terminal 420 (INPUT) is at the H level, the signal output unit 42 sets the first PF selection signal Si11 to the H level and the second PF selection signal Si12 to the L level. Also, when the input terminal 420 is at the L level, the signal output unit 42 sets the first PF selection signal Si11 to the L level and the second PF selection signal Si12 to the H level.

[0057] On the other hand, when the input terminal 420 becomes high impedance (Hi-Z), a current flows through the series circuit of the resistors R1, R2, R3, and R4, and the transistors Tr1 and Tr2 are turned on by the voltage (across the resistors R1 and R4) divided by the resistors R1, R2, R3, and R4. At this time, a current also flows through the series circuit of the resistors R5 and R6, and the transistor Tr3 is also turned on by the voltage (across the resistor R6) divided by the resistors R5 and R6. Therefore, when the input terminal 420 becomes high impedance, both the first PF selection signal Si11 and the second PF selection signal Si12 become the L level, which may lead to malfunction of the device (paper feeding unit 14).

[0058] In this embodiment, the first power supply Vcc1 for driving the signal generation unit 41 and the third power supply Vcc3 for driving the signal transmission circuit 3 are power supplies with a constant voltage (for example, 3.3V) supplied from a single power supply circuit. On the other hand, the second power supply Vcc2 for driving the signal output unit 42 is a power supply with an independent constant voltage different from these first power supply Vcc1 and third power supply Vcc3. The second power supply Vcc2 is output from the power supply control unit 43. In short, the image processing apparatus 10 separately includes the power supplies (the first power supply Vcc1 and the third power supply Vcc3) for the signal generation unit 41 and the second substrate 22, and the power supply (the second power supply Vcc2) for the signal output unit 42.

[0059] As shown in FIG. 6, the power supply control unit 43 includes resistors R11 to R14, transistors Tr11 and Tr12, and a capacitor C11. The transistor Tr11 is a pnp bipolar transistor. The transistor Tr12 is an npn bipolar transistor.

[0060] The emitter of the transistor Tr11 is connected to the first power supply Vcc1 composed of a constant voltage source, and the emitter of the transistor Tr12 is connected to the circuit ground. The resistor R11 is electrically connected between the base and emitter of the transistor Tr11. The resistor R14 is electrically connected between the base and emitter of the transistor Tr2. The resistor R12 is electrically connected between the collector of the transistor Tr12 and the base of the transistor Tr11. The resistor R3 is electrically connected between the base of the transistor Tr12 and the control terminal 412 of the signal generation unit 41.

[0061] The capacitor C11 is electrically connected between the collector of the transistor Tr11 and the circuit ground. In other words, the collector of the transistor Tr11 is connected to the circuit ground via the capacitor C11. Here, the connection point between the collector of the transistor Tr11 and the capacitor C11 is the output point of the second power supply Vcc2. That is, the power supply control unit 43 applies the voltage generated at the collector of the transistor Tr11 to the signal output unit 42 as the output voltage of the second power supply Vcc2.

[0062] Here, while the second signal Si2 is at the L level, the signal generation unit 41 outputs a third signal Si3 of the L level from the control terminal 412, and when the second signal Si2 becomes the H level, the signal generation unit 41 outputs a third signal Si3 of the H level from the control terminal 412. Then, while the third signal Si3 is at the L level (that is, while the second signal Si2 is at the L level), the power supply control unit 43 turns off the transistor Tr11 to stop the output of the second power supply Vcc2. Thereby, the power supply control unit 43 stops the power supply from the second power supply Vcc2 to the signal output unit 42 during the reset operation of the signal generation unit 41 by the second signal Si2.

[0063] Therefore, during the reset operation (reset period) of the signal generation unit 41, by stopping the power supply from the second power supply Vcc2 to the signal output unit 42, even if the input terminal 420 becomes high impedance, both the first PF selection signal Si11 and the second PF selection signal Si12 can be set to the H level. This can make it less likely that a malfunction of the device (paper feeding unit 14) occurs due to the input terminal 420 becoming high impedance.

[0064] Figure 7 is a timing chart showing an operation example of the control device 17 having the configuration described above. In Figure 7, the horizontal axis is the time axis, and from top to bottom in order, the first power supply Vcc1 and the third power supply Vcc3, the third signal Si3, the second power supply Vcc2, the second signal Si2 (reset signal), the first signal Si1, the first PF selection signal Si11, and the second PF selection signal Si12 are schematically shown.

[0065] As shown in FIG. 7, during the reset period from time point t1 when the power is turned on to time point t2, the second signal Si2 (reset signal) becomes the L level, and the signal generation unit 41 performs a reset operation. Therefore, during this reset period, the output terminal 410 of the signal generation unit 41 becomes high impedance, and the first signal Si1 output from the output terminal 410 becomes an unstable state (shown by a two-dot chain line in FIG. 7).

[0066] However, during the reset period, when the second signal Si2 (reset signal) becomes the L level, the third signal Si3 becomes the L level, and the power supply control unit 43 that receives the third signal Si3 stops the power supply from the second power supply Vcc2 to the signal output unit 42. Therefore, during the reset period (t1 - t2), both the first PF selection signal Si11 and the second PF selection signal Si12 become the H level.

[0067] After the time point t2 when the reset operation is completed, the signal generation unit 41 can cause the signal output unit 42 to output an arbitrary control signal (the first PF selection signal Si11 and the second PF selection signal Si12) by the first signal Si1.

[0068] [3] Modification Example A plurality of components included in the image processing apparatus 10 may be provided dispersedly in a plurality of housings.

[0069] Also, the control signal output by the control device 17 is not limited to the PF selection signal and the clock signal.

[0070] Also, the device controlled by the control signal is not limited to the paper feeding unit 14.

[0071] Also, it is not essential for the image processing apparatus 10 to include the first substrate 21 that is the transmission source of the control signal and the second substrate 22 that is the transmission destination of the control signal. For example, the transmission source and the transmission destination of the control signal may be configured on the same substrate.

[0072] Also, the specific configuration of the signal transmission circuit 3 is not limited to the configuration shown in FIG. 6, and can be appropriately changed as long as the same function can be realized.

[0073] [Supplementary Note of the Invention] The following is a supplementary note on the outline of the invention extracted from the above-described embodiment. Note that each configuration and each processing function described in the following supplementary note can be arbitrarily selected and combined.

[0074] <Supplementary Note 1> A signal generation unit that outputs a first signal from an output terminal, A signal output unit that has an input terminal to which the first signal is input and outputs a control signal corresponding to the first signal, A power supply control unit that controls a second power supply for driving the signal output unit provided separately from a first power supply for driving the signal generation unit and stops power supply from the second power supply to the signal output unit according to a second signal from the outside. Control device.

[0075] <Supplementary Note 2> The second signal is a reset signal that is input to the signal generation unit to reset the signal generation unit. The control device according to Supplementary Note 1.

[0076] <Supplementary Note 3> During the reset operation of the signal generation unit by the second signal, the power supply control unit stops power supply from the second power supply to the signal output unit. The control device according to Supplementary Note 2.

[0077] <Supplementary Note 4> The control device according to any one of Supplementary Notes 1 to 3, and A main body having an image processing function. Image processing apparatus.

Explanation of Reference Numerals

[0078] 10 Image processing apparatus 17 Control device 41 Signal generation unit 42 Signal output unit 43 Power supply control unit 101 Main body 410 Output terminal 420 Input terminal Si1 First signal Si2 Second signal Si11 First PF selection signal (control signal) Si12 Second PF selection signal (control signal) Vcc1 First power supply Vcc2 Second power supply

Claims

1. A signal generation unit that outputs a first signal from an output terminal, A signal output unit that has an input terminal to which the first signal is input and outputs a control signal corresponding to the first signal, A power supply control unit that controls a second power supply for driving the signal output unit provided separately from a first power supply for driving the signal generation unit and stops power supply from the second power supply to the signal output unit according to a second signal from the outside, A control device.

2. The second signal is a reset signal that is input to the signal generation unit to reset the signal generation unit, The control device according to claim 1.

3. The power supply control unit stops power supply from the second power supply to the signal output unit during a reset operation of the signal generation unit by the second signal, The control device according to claim 2.

4. A control device according to any one of claims 1 to 3, A main body having an image processing function, An image processing device.

Images