JP2002118725A - Original reader - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an original reader that properly controls a backlight mode, where an exposure lamp is turned-on to emit a light to an original from its rear side in the case of positioning the original on a contact glass plate. SOLUTION: When a pressing plate pressing the original 10 on the contact glass 13 is open, the original reader controls the lighting of the exposure lamp 14. The exposure lamp 14 emits a light to the rear side of the original 10, and its transmitted light is used to position the original 10. Thus, when user's hands are full for carrying out positioning, it is not required for the user to conduct operations, such as depression of a specific switch and workability for the positioning or the like is improved. Furthermore, it is not required to additionally provide an original emission lamp for positioning.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a document reading device used for copying, scanning, and the like.

[0002]

2. Description of the Related Art In a conventional document reading apparatus having an optical system comprising a scanner equipped with an exposure lamp and a mirror, the document is set on a contact glass with a document face down, and a copy start key is pressed to instruct a copy start. Then, a scanner equipped with an exposure lamp, a mirror and the like moves to scan the original on the contact glass, and the reflected light is guided to the CCD.

[0003]

However, in a conventional document reading apparatus having an optical system including a scanner equipped with an exposure lamp, a mirror, and the like, when a document is set on a contact glass, the document surface is turned downward. It must be set, and the user can see only the back side of the document. On the other hand, various manuscripts are brought to a copy center or a copy agency, and the demands on the finish of the copy are becoming more stringent.

One of the cases is that the frame 10a written on the document 10 is not parallel to the side edge of the document 10 as shown in FIG. 8, and if this is to be correctly copied as shown in FIG. As described above, the original 10 must be set on the contact glass 13 while intentionally tilting the original 10 with respect to the scales 11 and 12 provided on the contact glass 13. However, as described above, since the user can see only the back side of the document, the user has to consider the degree of tilting. Therefore, the work time for the alignment becomes longer and miscopying is likely to occur. was there.

As a measure for solving this problem, a dedicated document irradiating lamp has been conventionally provided, for example, below the contact glass, and this lamp is turned on to transmit the light to the document. In some cases, the document can be aligned by looking through the frame 10a or the like.

However, there are a scanner, a lens, a CCD, other substrates, a writing section, etc. below the contact glass, and it is very difficult to actually install the lamp in terms of space, and the cost is definitely increased. There was a problem of accompanying. Usually, in such a situation where the positioning is performed, there are many cases where both hands of the user are occupied to hold the document, and it is desired that the lamp be automatically turned on.

Further, for example, there is a technique for achieving an object by moving a scanner according to the above-mentioned inclination.
Since the time required for moving the scanner is required, it is not possible to expect a significant reduction in working time.

The present invention has been made to solve the above-described problem, and has as its object to use an exposure lamp as a backlight and appropriately control the turning on and off of the backlight.

[0009]

In order to achieve the above object, a document reading apparatus according to the present invention includes an exposure lamp for irradiating a document from behind the contact glass while scanning the document on the contact glass. Scanner means for guiding reflected light from a document to an image sensor;
At the standby position of the scanner means, there is provided a backlight mode control means for turning on an exposure lamp when a pressure plate for holding a document on the contact glass is opened.

[0010]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 4 is a schematic sectional view of the document reading apparatus according to the embodiment of the present invention. In FIG. 4, a document 10 is usually placed on a contact glass 13 so as to abut a scale 11. Exposure lamp 14 and first mirror 1
5 for holding the first and second mirrors 1 and 2
The document is scanned by a second scanner 19 holding the scanners 7 and 18, and the reflected light is guided to a CCD (image sensor) 21 through a lens 20. 28.

The positions of the scanners 16 and 19 in the drawing indicate the HP (home position) of the scanner, and the scanning line 22
Is referred to as the approach distance until it reaches the end face of the scale 11. If the approach distance is long, the light of the exposure lamp 14 does not reach near the end face of the scale 11, and the object of the present invention cannot be achieved. In order for the light of the exposure lamp 14 to sufficiently reach near the end face of the scale 11, the approach distance needs to be 30 mm or less, and in this embodiment, it is 30 mm or less.

The backlight mode in this embodiment is a mode executed when the scanner is in the HP mode, and uses the exposure lamp 14 as a document irradiation lamp, that is, uses the exposure lamp 14 as a backlight for irradiating the back side of the document 10. It was made.

FIG. 5 shows a document size detection mechanism on the operation panel, and shows an example of installation of the pressure plate sensor and the document detection sensor. 5, a pressure plate sensor (ADF open / close sensor 1)
2) 23 detects opening and closing of the pressure plate 24 near the fulcrum of the pressure plate 24. In a document reading apparatus, it is generally used as a document size detection timing.

A document detection sensor (APS sensor in the figure (width 1)
(2/3 direction and length direction)) 25 and 26 are for detecting the presence / absence and size of a document at several points on the contact glass 13, and a reflection type sensor is used. In order to detect the original size, a multi-beam type is used for the detection in the width direction, and three widths are detected. In the length direction, one point is detected.

FIG. 6 is a block diagram showing a schematic configuration of the document reading apparatus. 6, reference numeral 27 denotes an operation unit provided with operation buttons, a display unit, and the like; 28, a main control unit for controlling the whole; 29, a memory for storing image data and the like;
Reference numeral 0 denotes a timer for measuring the lighting time of the exposure lamp 14, which will be described later. Reference numeral 31 denotes a reading control unit, which includes a CCD 32, the pressure plate sensor 23, a scanner motor 33, an exposure lamp 14,
A scanner HP sensor 34, the document detection sensor 25,
26 is connected, and controls each unit based on the detection of each sensor.

FIG. 7 shows an operation panel on which the operation section 27 is provided. A display section 35, an initial setting key 36, a copy start key 37, and other predetermined keys are arranged.

Next, the backlight mode will be described. The ON / OFF of the backlight mode, the setting of the lighting time, and the like are performed by a button on the operation panel, for example, the initial setting key 36. This embodiment relates to control of turning on / off the exposure lamp 14 when the backlight mode is ON. Backlight mode is OF
At the time of F, this control does not work.

FIG. 1 is a flow chart showing the operation according to the first aspect of the present invention. As shown, when the pressure plate 24 is in the open state, the exposure lamp 14 is controlled to be turned on. When the exposure lamp 14 is turned on, the back surface of the document 10 is illuminated, and the transmitted light can be used to position the document 10. This eliminates the need for the user to perform an operation, such as pressing a specific switch, when the user is blocking his hand for performing the alignment, thereby improving the workability of the alignment and the like. Further, it is not necessary to separately provide a document irradiation lamp for positioning.

FIG. 2 is a flowchart showing the operation according to the second aspect of the present invention. As shown, when the pressure plate 24 is open and the document detection sensors 25 and 26 detect the presence of a document, the exposure lamp 14 is controlled to be turned on. This eliminates the need for the user to perform operations such as pressing a specific switch, and improves workability,
Energy loss and deterioration of the lamp itself due to the exposure lamp 14 being turned on when unnecessary can be prevented.

FIG. 3 is a flowchart showing the operation according to the third aspect of the present invention. In backlight mode,
With the exposure lamp 14 turned on, the copy start key 3
When the button 7 is pressed, the backlight mode is released, and if the copy start key is not pressed 37, the exposure lamp 14 is turned off when a preset time (for example, 5 to 10 seconds) has elapsed. . This can prevent energy loss and deterioration of the lamp itself due to the lamp being turned on for an unnecessarily long time.

[0021]

As described above, according to the first aspect of the present invention, since the exposure lamp is used as a backlight for irradiating the back side of the original and the backlight mode is operated by the signal of the pressure plate sensor, the user can specify a specific mode. It is not necessary to perform an operation such as pressing a switch, and workability such as alignment is improved.

According to the second aspect of the present invention, since the backlight mode is operated by the signal of the pressure plate sensor and the signal of the document detection sensor, it is not necessary for the user to perform an operation such as pressing a specific switch. In addition to improving the performance, it is possible to prevent energy loss and deterioration of the lamp itself due to the lamp being turned on when not needed.

According to the third aspect of the present invention, the lamp is turned off when the set time is exceeded, so that energy loss and deterioration of the lamp itself can be prevented.

[Brief description of the drawings]

FIG. 1 is a flowchart showing an operation in a backlight mode according to a first embodiment of the present invention.

FIG. 2 is a flowchart showing an operation in a backlight mode according to the first embodiment of the present invention.

FIG. 3 is a flowchart illustrating an operation in a backlight mode according to the first embodiment of the present invention.

FIG. 4 is a configuration diagram of a document reading apparatus according to an embodiment of the present invention.

FIG. 5 is a perspective view showing an example of installation of a pressure plate sensor, a document detection sensor, and the like on an operation panel surface.

FIG. 6 is a block diagram illustrating a configuration of a document reading apparatus according to an embodiment of the present invention.

FIG. 7 is a configuration diagram of an operation panel surface.

FIG. 8 is a configuration diagram illustrating a document whose frame is inclined.

FIG. 9 is a configuration diagram illustrating a case where a document whose frame is inclined is copied correctly.

FIG. 10 is a configuration diagram showing how a document is aligned on a contact glass.

[Explanation of symbols]

 10 Document 11, 12 Scale 13 Contact Glass 14 Exposure Lamp 16 First Scanner 19 Second Scanner 21 CCD 23 Pressure Plate Sensor (ADF Open / Close Sensor) 24 Pressure Plate 25, 26 Document Size Detection Sensor (APS Sensor) 27 Operation Unit 28 Main Control Unit 30 Timer 31 Reading control unit 36 Initial setting key 37 Copy start key

Claims (3)

[Claims] An exposure lamp for irradiating the original from behind the contact glass while scanning the original on the contact glass; a scanner for guiding reflected light from the original to an image sensor; and a standby position for the scanner. And a backlight mode control means for turning on an exposure lamp when a pressure plate for pressing the document on the contact glass is opened. 2. The document reading apparatus according to claim 1, wherein the backlight mode control means turns on the exposure lamp when the pressure plate is open and a document detection sensor detects the presence of a document. . 3. The backlight mode control means according to claim 1, wherein when the lighting time of the exposure lamp exceeds a predetermined time, the backlight mode control means turns off the exposure lamp.
Document reading device according to the above.