JPS60120664A - Picture copying machine - Google Patents

Abstract

PURPOSE:To reproduce copy of an medium tone with good quality by providing a control means changing simultaneously a luminous intensity of a light beam of a recorder and a recording time for one picture element's share in response to an analog output level corresponding to one picture element of a reading signal. CONSTITUTION:A level of an output signal (b) of a drive circuit 13 of a semiconductor laser is changed in proportion to the level of an output signal (a) from a reading circuit 12 of an image sensor 4. Moreover, the drive time of a semiconductor laser 8 is changed corresponding to a read output level for one picture element's share by a drive time control circuit 14. Thus, the shape of the laser beam spot recorded on a sensitizing paper sheet 11 becomes a large or small shape (c) and recorded with scanning. Thus, the recording laser beam spot is converted into the size of halftone dot and recorded according to the intermediate tone density of a reading picture.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention is applicable to a CCI) image sensor (CCI); The present invention relates to an image copying apparatus that operates a light beam of the recording apparatus to perform recording and copy an original based on an image signal read from the reading device.

In recent years, in general offices, devices that can copy and record images, such as copying machines and facsimiles, have become widespread. A complex wave is digitally read by a Rayleigh printer, and is recorded and reproduced by a Rayleigh printer (4 is a convenient device 19 that can read, record, and copy originals.

Conventional digital copying of images about J8 Kaede
This will be explained using figures. 1 is an original for reading, 2 is an illumination lamp, 3 is an imaging lens, and 4 is an image sensor such as a COD, and these constitute a line scanning type reading device.

The image of the document 1 is optically focused (Φ) on the image sensor 4 by the imaging lens 3, and the images are sequentially read by the sensor 4.

5) is a reading circuit; 6 is an output level determination circuit that determines the output level of the image signal of the reading circuit 5; and 7 is a semiconductor laser drive circuit that drives the semiconductor laser 8 based on the read signal.

The drive signal of the semiconductor laser 8 is read by the reading device r7.
The sky is empty q・1 and I'm this light (Yo,)! Crystal director 1)
Niri J, sl11. The light is directed in the i direction, focused on the [.theta. lens 10, imaged on the photosensitive paper 11, and scanned by the rotation of the deflector 9. The above operation 1- [Thus, the read line image a of the original to be read 1 is converted to the ll1i recording line rnb on the photosensitive paper 11. The photosensitive paper 11 is then developed, and each image of the original document 1 for reading is copied onto the photosensitive paper 11.

Conventionally, the image signal is divided into white (, 1 black, 2 (lII) level signals) depending on the reading threshold. ri
It was recorded using level signals. FIG. 2 is a schematic diagram illustrating the state of the A3 signal in a conventional device. Second
Figure a shows an image signal output from the reading circuit 5 of the image sensor 4, and the output level judgment circuit 6 judges whether this image is large or small with respect to the threshold value ET and is divided into C black or white level. It will be done. Figure 2 1) shows the semiconductor sheet 11.
There is an output signal C' from the drive circuit 7, and the optical output intensity of the semiconductor laser 1 is proportional to this output 11, so the shape of the laser beam spot recorded now will be as shown in Figure 2 C. . 4'), the intermediate tone level becomes black or white level.

As explained above, the conventional copying apparatus records signals at binary levels of white and black, and therefore has the disadvantage that it is not possible to perform TIj reproduction of halftone copies of photographs ``'', q.

Purpose of the Invention Does the present invention solve the above-mentioned conventional drawbacks? i! i'7J Ruchino,
An object of the present invention is to provide an image copying device capable of reproducing halftone copies of photographs and the like with good quality.

In order to configure the invention, the image copying apparatus of the present invention [
Also, an image reading device that scans a document in a line to read it, a recording device that records an image by scanning a light beam in a line, and a signal corresponding to one pixel of a read signal from the image reading device. detection means for detecting an analog output level;
control means for changing the light intensity of the optical beam of the recording device and the recording time for one pixel at 1i-i1 in response to the output level detected by the detection means;
This is an ideal configuration.

In this configuration, the halftone read image No. 111 is converted into a halftone dot shape at the time of recording (to improve the image quality of the halftone image). 7JS
- Description of an embodiment of the present invention will be described below with reference to the drawings.
There is a schematic 474 diagram of the multi-knob device, shown in Figure 1.
The M component search is the same (14 components have the same 1゛Jg (
J L, '(I omit the explanation of J.
-1-・'l G-J, reading device reading 1 & part, 8-11
In this case, the recording section of the recording device is formed into a recording section ii, 5 and performs the same operation as the conventional device. 12 is a reading circuit for the image sensor 4, and 13 is ? 1' and 1' horizontal equivalent drive, 14 is the drive 11.5 interval and 11 circuits (there is one).

Next, the operation will be explained. In other words, the image sensor 1 and the reading circuit 12 extract an image of the document 1 to be read at an analog level of V. Proportionally to this output norm, the semiconductor laser drive circuit 13 adjusts the intensity of the first horn of the semiconductor laser 8. Furthermore, the driving time control circuit 14 sets the driving time for one pixel of the semiconductor laser 8 in proportion to the output power of the reading circuit 12, and is configured to drive the semiconductor laser 8. There is.

FIG. 4 is an explanatory diagram of the signals of the image copying apparatus shown in FIG.
In proportion to the level of the output signal from the semiconductor laser drive circuit 13 as shown in FIG.
level changes. (The driving time control circuit 14 changes the driving time of the !li conductor laser 8 in accordance with the reading output level for one pixel. In other words, the light intensity and driving time of half 9 bodies 1 no 1 a 8 is increased or decreased within the time of one pixel in proportion to the read signal level.

In this way, the shapes of the laser beam spots 1 to 1 recorded on the photosensitive paper 11 are scanned and recorded as shown in FIG. 4C. In this way, the recording laser beam spot is converted into the size of halftone dots and recorded according to the halftone power generation of the read image.

In this way, a halftone image is converted into a grayscale image at the halftone dots and recorded. '1 quality halftone image can be copied.

FIG. 5 shows a specific example of the drive time control circuit 14.

In Fig. 5, C116 is a 1] comparator, 17 is a shift 1
-1 Nodisk, 18 is an oscillation circuit, Figure 6 is a waveform diagram of each part of the circuit shown in Figure 5.
I da C level, (d) is serial output" (there is.

Read output level from reading circuit 12 (c) 1. J...
The electric current generated by the resistor R and the power source VB is compared by the inverter 16. ] River Lake 1G I+r Exit J
, is converted into a time width by the register 17. This is it
1.1 Start signal'';, (+,,+)g: After adding the node of I comparator 10 to the digital register 17, adding the 11k (・a), the serial output (d) or 111 3. In this way, the IVY output level (c) is converted into the time width of siri)/le output (2).

Q: J5, When the temperature of the image is near the white level, when it is below a certain threshold level (L, Semiconductor Ray Shin-A E)
By setting the recording time to zero, fogging will not occur on the white background.

Effects of the Invention - As explained above, the present invention has the advantage of converting a halftone original image into a dot-like gray image and copying it. You can also obtain the effect of copying originals when reproducing them.

[Brief explanation of the drawing]

FIG. 1 is a schematic configuration diagram of a conventional image copying apparatus, FIG. 2 is an explanatory diagram of each signal of the image copying apparatus, and FIG. 3 is a schematic diagram of an image copying apparatus according to an embodiment of the present invention. 1/J Composition, No. 4
The figure is an explanatory diagram of each signal of the image copying device, and FIG. 5 is a circuit diagram of the drive time control circuit J5'=j in the image copying device.
Fig. 6 (J Fig. 5 shows signal waveform diagrams of various parts of the circuit. 2. Illumination lens, 3. Imaging lens, 4. Image sensor 1, 8. Semiconductor. 9...Deflector, 10...f/0 lens, 12...Reading circuit,
13... Semiconductor laser drive circuit, 14... Drive time control circuit type (IP person Yoshihiro Morimoto Figure 1 Figure 2, Figure 3 Figure 4 <C) -oi. 8. Explosion

Claims (1)

[Claims] 1. Scan the original in a line and read C with fj-r i!
An image capture device, a recording device that records images by scanning a light beam in a line, and an analog output level corresponding to one pixel of the read signal from the image reading device is detected. and a control means for simultaneously changing the recording time for one pixel, such as the intensity of the light beam of the recording device, in accordance with the output level detected by the detection means.
1 image copying device.