JPH0629263U - Image reader - Google Patents

Abstract

(57) [Summary] [Purpose] To read the image of a transparent original well. [Structure] The main body switch 4, the outer lid switch 5, and the cassette switch 10 are connected to a control circuit 14.
The control circuit 14 is composed of an AND circuit 11, a D-type flip-flop 12 and a CPU 13. The outer lid switch 5 is switched according to the open state of the outer lid,
AND when the cassette switch 10 is switched corresponding to the setting of the document cassette and the main body switch 4 is switched to turn on the illumination device 6 (when the output of the D-type flip-flop 12 is at the high level). Circuit 1
1 outputs a high level signal to the CPU 13.
When the CPU 13 receives this High level signal,
The lighting device 6 is turned on.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to an image reading apparatus suitable for use in reading an image such as a transparent original.

[0002]

[Prior art]

 In the conventional image reading device, the outer lid provided on the main body of the device is opened, the transparent original is set on the original feeding section provided inside the device, and then the outer lid is closed to read the image of the transparent original. Is configured. Further, the image reading device is provided with an illuminating device that illuminates the original so that the transparent original can be accurately set at the correct position on the original conveying section. This lighting device is turned on or off by a main body switch provided outside the main body.

The user opens the outer lid, turns on the main body switch to turn on the lighting device, sets the transparent original in the original feeding section, and then turns off the main body switch to turn off the lighting device, Close the outer lid. The reading unit provided in the apparatus irradiates the transparent document conveyed from the document conveying unit with light from a read-only light source to perform image reading of the transparent document.

[0004]

[Problems to be solved by the device]

 However, in the conventional image reading apparatus having the above-described configuration, when the user forgets to turn off the main body switch (while the main body switch remains on) and executes the image reading of the transparent original, the set position is confirmed. Therefore, there is a problem that the light of the illuminating device that is turned on interferes with the light of the reading unit that is irradiated on the transparent original, and the image of the transparent original cannot be read well.

The present invention has been made in order to solve the above-mentioned problems, and an image of a transparent original can be read well even if the main body switch is forgotten to be turned off. An object is to provide a reading device.

[0006]

[Means for Solving the Problems]

 The image reading apparatus according to claim 1, wherein an outer lid 2 which is opened and closed when a document is set, an illuminating device 6 which illuminates a placement position of the document, and an outer lid which is switched in association with opening and closing of the outer lid 2. A switch 5, a cassette switch 10 for detecting whether or not the document cassette 3 on which a document is set is mounted, and an outer cover switch 5 for detecting the open state of the outer cover 2, and a cassette switch 10 for the document cassette 3 And a control circuit 14 for switching the lighting device 6 to turn off when the outer lid switch 5 detects the closed state of the outer lid 2 when the set state is detected. And

[0007]

[Action]

 The image reading device of the present invention does not waste power by activating the illuminating device and can turn off the illuminating device when the user does not need it.

[0008]

【Example】

 FIG. 1 is a perspective view showing the configuration of an embodiment of the image reading apparatus of the present invention. Further, FIG. 2A shows a side view of FIG. 1, and shows how the outer lid 2 is opened and closed. 2B shows the internal structure of the embodiment shown in FIG.

As shown in FIG. 1, the outer lid 2 is provided on the main body of the image reading apparatus 1 so as to be openable and closable. The outer lid switch 5 is a switch provided so as to be switched according to opening / closing of the outer lid 2, and is provided near the opening / closing fulcrum portion 2b of the outer lid 2. The main body switch 4 is a switch for turning on and off a lighting device 6 described later, and is a switch operated by a user. The document feeder 7 is formed on the right side of the main body of the image reading apparatus 1 in the figure, and the document cassette 3 accommodating the transparent document placed on the document feeder 7 is inserted into the opening 8. It is formed so as to be conveyed to the reading unit 9.

Further, the cassette switch 10 provided on the original feeding section 7 is switched from OFF to ON when the original cassette 3 is placed at a predetermined position of the original feeding section 7, and the original cassette 3 is turned on. This is a switch that switches from ON to OFF when it is conveyed to the reading unit 9. The reading unit 9 is formed on the left side of the main body of the image reading apparatus 1 in the drawing, and irradiates the transmitted transparent original on the original cassette 3 with light to perform image reading.

Further, as shown in FIG. 2A, the illuminating device 6 is provided below the document transport unit 7 in the figure, and when the document cassette 3 is set in the document transport unit 7, the document transport unit 7 transports the document. This is a device for illuminating the part 7. When the outer lid 2 is opened (shown by the solid line in the figure), the outer lid switch 5 is turned on. When the outer lid 2 is closed as indicated by the chain double-dashed line in the figure, one surface 2a of the outer lid 2 contacts the outer lid switch 5. As a result, the outer lid switch 5 is switched from on to off.

FIG. 2B is a cross-sectional view of the image reading device 1, and is a diagram for explaining the outline of the illumination device 6 and the document reading optical system. The image reading apparatus 1 is an apparatus that can read both a reflective original and a transparent original as a set original. When the original of the original cassette 3 is a transparent original, the image reading apparatus 1 turns on the reading illumination section 30 and turns off the reading illumination section 31. When the image reading apparatus 1 reads a transparent original, the original cassette 3 is moved from the position indicated by the solid line to the position indicated by the alternate long and two short dashes line, and at the same time as the movement, the original is illuminated by the reading illumination unit 30 and the original is read. An optical image is formed on the CCD line sensor 36 via the mirrors 32, 33, 34 and the lens unit 35, and as a result, read. Similarly, when the image reading apparatus 1 reads a reflective original, the reading illumination unit 31 illuminates the original and a reflected image of the original is formed on the CCD line sensor 36 and read.

FIG. 3 is a perspective view showing a detailed structure of the document cassette 3 shown in FIG. 1 and a document 25 and a mask 26 set in the document cassette 3.

As shown in FIG. 3, a document glass 22 is attached to an opening provided in the center of the base plate 21. Further, both ends of the arm 24 holding the cover glass 20 are supported by hinges 23a and 23b fixed on the base plate 21 so as to be rotatable in the AB direction in the figure.

When setting the original 25 in the original cassette 3, the user places the original 25 on the original glass 22 via the mask 26 and closes the cover glass 20. FIG. 4 is a side view showing a state in which the original 25 is set in the original cassette 3 as described above. As shown in FIG. 4, the original 25 and the mask 26 placed on the original glass 22 are sandwiched by the cover glass 20 and the original glass 22 of the original cassette 3.

Next, the electrical configuration of the embodiment shown in FIG. 1 will be described. FIG. 5 is a block diagram showing an electrical configuration of the embodiment shown in FIG. As shown in FIG. 5, the main body switch 4, the outer lid switch 5, and the cassette switch 10 are connected to the control circuit 14. The control circuit 14 is composed of an AND circuit 11, a D-type flip-flop 12 and a CPU 13.

In the D-type flip-flop 12, the main body switch 4 is connected to the clock terminal CK thereof, and the outer lid switch 5 is connected to the clear terminal CLR thereof. The QX terminal that outputs the opposite logic to the Q terminal is connected to the D terminal, and the preset terminal PR is connected to the CPU 13.

The AND circuit 11 receives signals input from the outer lid switch 5, the cassette switch 10, and the D flip-flop 12, and outputs a logical product signal to the CPU 13. The CPU 13 receives the signal from the AND circuit 11 and controls the lighting and extinguishing of the lighting device 6.

Next, the operation of the device shown in FIG. 5 will be described. The outer lid switch 5 outputs a high level signal to the AND circuit 11 when the outer lid 2 is opened, and outputs a low level signal to the AND circuit 11 when the outer lid 2 is closed. The cassette switch 10 outputs a high level signal to the AND circuit 11 when the document cassette 3 is placed on the document transport section 7, and outputs a low level signal when the document cassette 3 is not placed. It is output to the AND circuit 11. The main body switch 4 outputs a High level signal only during a period of being operated (pressed), and outputs a Low level signal when the operation (pressed) is released. In the initial state, the CPU 13 outputs a Low level signal to the preset terminal PR so that the D flip-flop 12 is set.

As shown by the solid line in FIG. 2, when the outer lid 2 is opened and the original cassette 3 is placed on the original conveying section 7, the outer lid switch 5 is set to the high level. Signal is output to the AND circuit 11, and the cassette switch 10 outputs a high level signal to the AND circuit 11. Since the D-type flip-flop 12 is now set, its Q terminal outputs a high level signal (the QX terminal thereof is a low level signal).

As a result, the AND circuit 11 outputs a high level signal to the CPU 13. Upon receiving the high level signal, the CPU 13 turns on the lighting device 6.

In this way, when the main body switch 4 is pressed while the lighting device 6 is turned on, the logic (Low level) of the D terminal (QX terminal) of the flip-flop 12 is output to the Q terminal. As a result, the output of the AND circuit 11 becomes Low level. Therefore, at this time, the CPU 13 turns off the lighting device 6.

When the main body switch 4 is pressed again, the logic (High level) of the D terminal (QX terminal) of the flip-flop 12 is output to the Q terminal. As a result, the output of the AND circuit 11 becomes High level, and the CPU 13 turns on the lighting device 6.

As described above, when the outer cover switch 5 is turned on (the outer cover 2 is in an open state) and the cassette switch 10 is turned on (the original document cassette 3 is placed on the original document transport unit 7). Each time the main body switch 4 is operated, the lighting device 6 is switched from the lit state to the unlit state, or vice versa.

On the other hand, when the document cassette 3 is not placed on the document transport unit 7, the cassette switch 10 outputs a Low level signal to the AND circuit 11. As a result, the AND circuit 11 outputs a low-level signal to the CPU 13 regardless of the level of the input signal from the flip-flop 12. When receiving the low level signal, the CPU 13 turns off the lighting device 6.

Similarly, when the outer lid 2 is closed as indicated by the chain double-dashed line in FIG. 2, the outer lid switch 5 outputs a low level signal to the AND circuit 11. As a result, the AND circuit 11 outputs a low level signal to the CPU 13 regardless of the level of the input signal from the flip-flop 12. Therefore, the CPU 13 turns off the lighting device 6.

That is, when the outer lid 2 is closed or the document cassette 3 is not placed on the document transport unit 7, the operation of the main body switch 4 is substantially prohibited (ineffective). Will be).

As is apparent from the above description, only when the outer cover 2 is opened and the document cassette 3 is placed on the document transport unit 7, the user switches the main body switch 4 to illuminate. The device 6 can be turned on or off. When the reading operation is started while the illumination device 6 is still lit, the outer cover 2 is closed or the original cassette 3 is transferred into the reading unit 9, and the cassette switch 10 outputs the low level signal. Since the light is output and the output of the AND circuit 11 becomes Low level, the lighting device 6 is automatically turned off.

In the above embodiment, the cassette switch 10 detects the transfer operation of the document cassette 3 and turns off the illumination device automatically. However, for example, without using the cassette switch 10, the image reading device control is performed. The illumination device may be automatically turned off in response to a transfer operation command signal of the document cassette of the host computer for use in the computer.

[0030]

[Effect of device]

 According to the present invention, since the lighting device is controlled to be turned on and off depending on the state of the outer cover switch and the cassette switch, it is possible to prevent the lighting device from being uselessly consumed and consume electric power. The lighting device can be turned off as needed.

[Brief description of drawings]

FIG. 1 is a perspective view showing the configuration of an embodiment of an image reading apparatus of the present invention.

FIG. 2A is a right side view of the embodiment shown in FIG. 1, showing how the outer lid 2 is opened and closed. FIG. 2B is a sectional view showing the internal structure of the embodiment of FIG.

3 is a perspective view showing a detailed configuration of a document cassette 3 of FIG.

4 is a side view of the document cassette 3 of FIG. 3, showing a state when the cover glass 20 is closed.

5 is a block diagram showing an electrical configuration of the embodiment of FIG.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Image reading device 2 Outer lid 3 Original cassette 4 Main body switch 5 Outer lid switch 6 Illumination device 10 Cassette switch 11 AND circuit 12 D-type flip-flop 13 CPU 14 Control circuit

Claims (4)

[Scope of utility model registration request] 1. An outer lid that opens and closes when a document is set, an illuminating device that illuminates the placement position of the document, an outer lid switch that switches in conjunction with opening and closing of the outer cover, and the document setting. A cassette switch for detecting whether or not the mounted original cassette is attached, and the illumination device when the outer lid switch detects the open state of the outer lid and the cassette switch detects the set state of the original cassette. An image reading apparatus, comprising: a control circuit that is turned on and switches the illumination device to be turned off when the outer lid switch detects a closed state of the outer lid. 2. A body switch that is manually operated to switch on / off of the lighting device, wherein the control circuit flips a logic of an output of the body switch in response to an input from the body switch. An AND signal that outputs a logical product signal of the signal input from the outer lid switch, the signal input from the cassette switch, and the signal input from the flip-flop
The image reading apparatus according to claim 1, further comprising a circuit. 3. The image reading apparatus according to claim 2, wherein the control circuit turns off the illumination device when the main body switch is operated when the illumination device is turned on. 4. The cassette switch detects whether or not the original cassette has been moved for image reading, and the control circuit transfers the original cassette for image reading by the cassette switch. The image reading apparatus according to claim 1, wherein the lighting device is turned off when it is detected that the illumination is present.