JPH0343827B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Industrial Application Field) The present invention relates to a copying apparatus, and particularly to a copying apparatus that handles book-type originals.

(Prior Art) Conventionally, most devices for obtaining copies of originals are of the type that copies (scans) with the side to be copied facing downward. This is because the light is irradiated from below, but it is thought that by devising the optical system, it is possible to copy with the surface to be copied facing upward. For example, as shown in Figure 1 of Japanese Utility Model Publication No. 53-102634, the side of the original to be copied faces upward, irradiates light from above, obtains the reflected light, and uses the reflected light to make copies. It's a way of getting things.

However, the above publications do not cover copying of book-type manuscripts at all. To be more specific, in FIG. 2 of the above-mentioned publication, the presser plate needs to be transparent because the light is irradiated from above. Therefore, in this publication, the presser plate is made of glass. However, with this method of holding the edge of the glass on the document table, for example, when a thick book-type document is pressed down with the glass, one end is fixed, so the glass may lift up due to the thickness of the document. It becomes loose and stops working as a presser plate. It would seem that a presser plate may not be necessary, but since book-type originals (including file originals) have a binding area, the surface to be copied is not necessarily flat. It is clear that a clear copy cannot be obtained by simply copying such a manuscript.
In the end, in the case of thick book-type manuscripts, it was thought that it would be easier and clearer for the operator to press the manuscript from the back side with the copy side facing down. .

(Problem to be solved by the invention) In a copying device, the upward copying method is better than
Although extremely convenient for the operator, the conventional apparatus was capable of handling both thin and book-type originals, and was unable to produce copies with the original facing upward.

The present invention has been made in view of the above problems, and an object of the present invention is to provide a copying apparatus capable of producing clear copies of not only thin originals but also book-type originals while facing upward.

[Structure of the invention]

(Means for solving the problem) Place a book-type original on the document table with the side you want to copy facing upwards, and use a light-transmissive pressing device, such as a hard thin glass or acrylic plate, from above the side you want to copy. Press down on the original. Also, with this pressing, the relative positions of the document table and the pressing means are held parallel according to the thickness of the original, and the book-type original held down by the pressing means is read from above the surface to be copied. , a copying apparatus that obtains a copy of a desired original.

(Function) With the side of the book-type original to be copied facing upward, it is pressed down from above by a light-transmitting pressing means. Furthermore, since the relative position (width) between the document table on which the document can be placed and the pressing means can vary depending on the thickness of the document, the desired copy can be obtained by visually observing the surface of the book-type document from above on which the desired copy is to be made. .

[Embodiments of the invention]

Next, an embodiment of the present invention will be described with reference to the drawings. The copying apparatus in this embodiment is characterized in that it can copy a book-type original to be copied while visually observing it.

First, FIG. 1 shows the basic configuration of the copying apparatus of this embodiment. A document 1 is placed on a document table 2, and a transparent sheet 3 is placed on top of it. Image information on the original document 1 is read through the transparent sheet 3 by a signal detection system 4 installed above as shown in FIG. In this embodiment, the copy range is written on sheet 3 with a red marker. The sheet 3 also serves to keep the original 1 flat, so it must not be easily deformed, but it must also not be too thick, since if the upper surfaces of the original 1 and the sheet 3 are too far apart, the focus will shift. It is also desirable to be able to erase the written mark and use it repeatedly. Therefore, for example, a 3 mm thick vinyl sheet is suitable. However, in the configuration shown in the latter part, it is better to use a hard thin glass or acrylic plate.

As shown in FIG. 4, the detection system for reading the image information of the original is comprised of an imaging lens 5, a semi-transparent mirror 6, a color filter 7 that transmits long wavelengths, and two line sensors 8 and 9. During normal operation and use, the detection system performs reading using light based on indoor lighting. However, a light source may be set above the document table if necessary. In order to read the reflected light from the original 1, the detection system moves in the longitudinal direction of the original 1 and performs sub-scanning. Main scanning is achieved electrically with a line sensor.

Next, we will explain how to detect the copy range designation frame written in red. With the system shown in FIG. 5a, the black portion of the document is detected by both line sensors 8 and 9, as shown in FIG. 5b. The red part is not detected by a line sensor equipped with a color filter because it is the same as the white part. Therefore, using the signals A and B shown in FIG. 5B, a red frame can be determined by a simple logic circuit. In reality, as shown in Fig. 6, scanning is performed using the scanning line 10 to record only the inside of the red frame 11, but in order to do this, the detection signal is gated and recorded using a circuit as shown in Fig. 7. Just record it as a signal.

Next, the feature of this embodiment is that one end of the transparent sheet 3, which specifies the copying range using the cross-sectional view of FIG. 1, is attached to a column 12 that can be moved up and down.
As described above, hard thin glass or the like is considered to be suitable for this transparent sheet 3. Also, the pillar 12,
By connecting the detection system columns 13, the distance between the seat 3 and the detection system 4 can be kept constant.

With the structure shown in Figure 1, when copying thick books (book-type originals), the distance between the surface to be copied and the detection system is kept constant, making it easier to focus. There is no need to match.
In other words, in this embodiment, the operator can perform upward copying while visually observing the copy, which has not been possible in the past, and it is possible to obtain good copies regardless of the type of original.

As a result, it is possible to easily specify a desired area of a book-type original to be copied, and partial copying of multiple areas in one original or an area with a complex shape can be effectively performed. Therefore, the burden on the operator is significantly reduced compared to the conventional method.

Further, in the color separation optical system of the above embodiment, a semi-transparent mirror having wavelength characteristics may be used instead of the color filter. Further, the marker is not limited to red.

〔Effect of the invention〕

According to this invention, a desired copy can be obtained by visually observing the side of a book-type original to be copied.

[Brief explanation of drawings]

FIG. 1 is a cross-sectional view showing one embodiment of the present invention, and FIG.
The figure is an external view of a copying machine showing the basic configuration of an embodiment of the present invention, FIG. 3 is a front view thereof, FIG. 4 is a layout diagram showing the principal length optical element of the detection system, and FIGS. 5a and 5b are FIG. 6 is an explanatory diagram of signal processing, FIG. 6 is a diagram for explaining the copy range, and FIG. 7 is a circuit diagram for creating a recording signal. 1...Paper surface, 2...Original table, 3...Transparent sheet, 4...Signal detection system, 7...Color filter, 8,
9...Line sensor.

Claims (1)

[Claims] 1 A document table on which a book-type original is placed so that the side to be copied faces upward, and a presser from above to keep the side of the document placed on the document table almost flat. a light-transmissive pressing member that is movable in a state in which the original is held parallel to the document table depending on the thickness of the original; and the book-type original that is pressed by the pressing member. a reading means including at least an imaging lens and a line sensor so as to be able to read the original from above the surface to be copied; and means for copying the original read by the reading means to produce a desired copy; A copying apparatus characterized in that the member and the reading means are connected to each other so that the distance between the two is constant.