JPS5862966A - Picture transmission system - Google Patents

Abstract

PURPOSE:To eliminat a direct contact part to move a reading section and a picture recording section freely, and to transmit picture accurately in high speed, by transmitting a data read at a picture reading section to the picture recording section via a spatial optical communication path. CONSTITUTION:An image sensor C of reading sections 100-1-100-3 arranged scatteringly reads a picture of sheet original, a picture data in time series is FM-demodulated at a modulation circuit and each signal is applied to an optical transmission section 500. A light emitting element 501 of the section 500 is taken as a light emitting diode or a laser diode, the light from the element 501 is collected at a lens 502 and supplied to a spatial optical communication path of a photodetecting section 700 as an optical beam Lt. A photodetector 701 of the section 700 is taken as an avalache photo diode, the optical beam Lt is converted into an electric signal at the element 701 to reproduce a signal FMS. The signal is transmitted to a recording section 300 with a coaxial cable 900 is perform picture transmission accurately in high speed.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an image transmission system, and more particularly to an image transmission system suitable for transmitting an image between an image reading section and an image recording section.

When the image reading section and the image recording section are placed separately in a factory or office, etc., and images are transmitted between them,
It is desirable that the transmission method be capable of high-speed communication, be capable of reliably reproducing image signals, and furthermore be capable of easily moving the reading section or the recording section as necessary.

An object of the present invention is to read an image of a manuscript that can meet such demands with a one-dimensional solid-state image sensor, for example, a COD line image sensor, and convert it into time-series image data VDA'. This image data VDm is quantized, this image data VD and command data (J for operating the recording unit 300) are supplied to a modulation circuit in the reading unit ioo, and a predetermined clock signal is quantized by these signals (hereinafter [ data signal DSJ
Collectively called. ) to perform pulse frequency modulation (also known as MFM). The output signal of the pulse frequency modulation circuit, ie, the pulse FM signal FMS, is supplied to the light transmitting unit SOO to drive the built-in light emitting element 10/, such as a light emitting diode or a laser diode.

The light emitted from the light emitting element jO7 is focused by a lens jOλ to form a light beam Lt, and this light beam Lt is supplied to a light receiving unit '100K attached to a ceiling or the like.

A light receiving element 70/, for example an avalanche photodiode, built in the light receiving section 700 converts the intensity of light of this light beam Lt into an electrical signal and generates the above-mentioned pulse FM signal FM.
Reproduce S. This signal FM via coaxial cable 900
S is supplied to the recording section 300. Recording unit zoo B extracts image data VD, write control clock WCK, and command data CD from the supplied pulse FM signal FMS. The recording unit 300 performs a predetermined image recording operation based on each of these signals.

FIG. 3 shows an example of the reading mechanism of the reading unit 100, where K
10/ is a sheet manuscript, 10 pieces, 103 is a manuscript 10
1oII is a platen provided on the document feeding path, and the image of the lower surface of the document/II passing through position A of the platen 100 is read at any time. The tOS is a guide for original loading, which functions to hold down the original 10/ and form an image with good bits. i
ot and 107 are document position detection means for detecting the paper edge of the document 101, and detect the point in time when the paper edge of the fed document 10/ obstructs the progress of light from the light emitting element io≦ to the light receiving element 107. Detect.

This detection signal is used to control the recording section 300.

ioz is a bar-shaped light source for illuminating the original, such as a halogen lamp, and illuminates the reading position of the platen io+ from below. 1
09 is a folding mirror for the document i passing through the reading position.
The image light Lr reflected by oi is turned back as shown in the figure.

/10 is an image forming lens, which functions to form an image of the image light Lr to improve the light reception of the COD line image sensor/sll. The image light Lr formed by COD Line Image Sensor Co., Ltd. is converted into time-series image data TDA of a predetermined number of bits.

Figure 3 shows the recording mechanism of the recording section 300, where 30/
30/B is the 1st record organization.

In this embodiment, these λ recording mechanisms 30/A and 30
Assuming that the structure of /B is exactly the same, the code ``l'' that indicates the entire recording mechanism is used.Only for J, the code ``MU'' that distinguishes the first recording mechanism and the second recording mechanism is appended rBJ, and the details of the recording mechanism are The same reference numerals are used for all recording mechanisms.

to the seventh recording mechanism 30/B and to the second recording mechanism 30/B
each includes two recording heads, for example, inkjet heads 30 and 303. Each inkjet head is a full-line inkjet head in which a plurality of recording elements are arranged in a straight line in a direction perpendicular to the drawing in FIG. The inkjet head is driven to perform recording.In this example, the inkjet head 30 dots/m≦dots/m
It is assumed that the inkjet head 303 performs black normal mode recording of 1 dot/Wa and red normal mode recording of 1 dot/Wa. Each recording mechanism 30/mu and JO/B
are vertically stacked in two stages by supports (not shown).

304I is a recording paper storage cassette, 30j is the recording paper stored in this cassette, 306 is a paper feed roller, JOY
301 is a guide plate, 301 is a registration roller, 309 is a first conveyance roller, 310 is a platen having many pores, J
// is a fan, 3/ is the second conveyor row 2, J/J is a suspension roller, Jll is a conveyor belt, 3/! are the paper output tray, 316 and the 3/'lid ink tank.

Next, the recording operation in the above mechanism will be explained.
Since the two recording mechanisms 301 and 10/B operate in exactly the same way, only the recording mechanism 301 will be described here.

The recording paper 303 stored in the paper cassette 3011 is fed along the guide plate 307 by the rotation of the paper feed roller 30≦to the registration roller 30t, which has stopped rotating, and forms an appropriate loop. Next, as the registration roller 301 rotates, the recording paper is moved to the registration roller 301r.
and the first conveyance roller 309, and is conveyed in the direction of the inkjet heads 30λ and 303. At this time, a butylene 310 having pores and a fan J// are arranged on the opposite side of the inkjet heads 30 and 303, and air is blown in the T direction in FIG. 11 by rotation of the fan J//. Therefore, the recording paper 3os that has passed the first conveyance roller 309 is conveyed in one direction on the second conveyance roller 31 over the platen JlO while being attracted by the fan J//. During this transfer process, the COD line image sensor/
Recording is performed by the drive circuit according to the image data VD from ll. After recording, when the leading edge of the recording paper SOS is transferred to the No. 1 transport roller 31.2, the leading edge of the recording paper SOS is transferred to the No. 1 transport roller J/
, 2 and conveyance bell) J# causes the recording paper 303 to be ejected to the paper ejection tray 311. ◎ Figure 3 shows the reading section 1ooO control circuit and the light transmitting section jOO, where /// is the above-mentioned COD. The line image sensor is driven by a drive circuit //j which is controlled by a timing signal from a timing drawing circuit /l, and generates time-series image data TDA.

//It is a quantization circuit, which quantizes the image data VDM. Transmission control circuit/l for transmitting the image signal VD converted into quantized
supply to j. /16 is the central processing unit, and the memory tt consists of random access memory, read-only memory, etc.
The operation of each part of the reading section 100 is controlled according to the control program written in 'r. Its is a boat for controlling the reading mechanism, which sends a blinking signal to the halogen lamp 101, a brake to rotate or stop the feed rollers 10 and 103, and a drive signal to the Clara roller, and detects the document position. The detection signal from the device tag 107 is received. //9 is a console input port, which receives the recording unit control signal from the control console saw l placed on the cover 12″0 on the top surface of the reading unit 100. Three button buttons for selecting colors /2/&~/λ/d, recording start button /6 and cancel button /2
/f t-has. When pushbutton l/a is pressed, the transmitted image data VD is supplied to the black inkjet head 302K to the first recording mechanism 301, and recording is performed using black ink. The following table shows the relationship between each of the 7 pushbutton i1 recording mechanisms and the recording colors.

12 boats are command data, 4 boats are recording mechanism 30/
Various command data CD for controlling the recording operations of A and 30/B are supplied to the transmission control circuit //j.

/23 is a transmission control port, which sends a transmission control signal for controlling the operation of the transmission control circuit its. The transmission control circuit IIS transmits a quantization circuit according to the transmission control signal and the timing signal. The image data VD or command data CD supplied from // is subjected to predetermined processing on the command data CD supplied from //, and the output signal (data signal) DS is supplied to the frequency modulation circuit lλIIc.

In this embodiment, in order to distinguish between the image data VD and the command data CD, as shown in FIG. Add VH or instruction data header OH. Data signal D with these headers added
a is supplied to the pulse frequency modulation circuit 121. This F-coupler circuit 1 receives the clock signal O supplied from the timing control circuit // by the supplied data signal DS.
KM is pulse frequency modulated.

The output FMS of the modulation circuit l is supplied to the LID driving amplifier/21, and the output drives the diode soi of the light transmitting section SOO. As described above, the output light of the light emitting diode 10/ is focused by the lens 50 to form a light beam Lt, and this beam Lt is supplied to the light receiving section 100.

FIG. 7 shows the control circuit of the recording section 2000 and the light receiving section 700, in which the light beam Lt from the light transmitting section SOO mentioned above is converted into an electric signal, sunawachi, pulse F) [signal-11F lid S] by an avalanche photodiode 70/. . 70J is a preamplifier that amplifies this signal VMS, and its output signal is supplied to the narrowband amplifier 320K of the recording section 300 via the aforementioned coaxial cable 900. Narrowband amplification @ J, JO
The output signal is supplied to three demodulation circuits/.

A demodulated clock signal OKD and a demodulated data signal D8 are extracted from the signal FMS supplied to the three demodulating circuits. The demodulated clock signal OKD is supplied to the timing signal generation circuit 3J. This circuit JJJ generates a write control clock signal OKW. This signal OKW is the recording mechanism 301
Used to control the timing of writing k or 30/B. The demodulated data signal Da is supplied to the serial-parallel conversion circuit 323. This conversion circuit JJJ converts the demodulated data signal Da, which is a serial (time series) pulse signal, into a parallel (parallel) pulse signal P8, and converts this into a parallel pulse signal P8. and 3 latch circuits tK, and also supplies the serial pulse signal DB to the gate circuit J core with a predetermined delay.

Image header detection circuit 3 Koda Hiro-4 When the image header VH shown in the figure is detected, the image header output signal VaS is supplied to the gate circuit 327 to open the gate 3 core, and the image data VD at that time is sent to the recording mechanism 3oi. The image data is supplied directly to the image memory 30/B or indirectly through an image memory 30/M that temporarily stores image data. When the instruction header detection circuit 3 S detects the instruction header OH shown in FIG. 4, it generates an instruction header detection signal CBS. This signal O
H8 is supplied to the delay circuit sit, delayed by a predetermined number of bits, and supplied to the latch circuit 3λ6 as a latch signal. As a result, the three latch circuits tFi latch the command data signal CD when the parallelization is completed. This command data signal CD specifies an interrupt request, start timing, recording mechanism 30/M or 30/B to be used, recording color, etc., and the control of recording #1@@ structure is performed in accordance with this signal CD. The image header detection circuit 3q and the instruction header detection circuit 3j also supply a detection signal to the dead time generation circuit 330 via the OR circuit 3x9 at the time they detect their respective headers. Dead time generation circuit 330 generates dead time signal DTS in response to this detection signal. Each header detection circuit 3
This punto time signal DTS is supplied to the terminals 323 and 323. While this dead time signal DTS is being supplied, each of the header detection circuits 3 and 3 stops operating. Because of this, even if there is a part in the image data VD that has the same bit configuration as the image header vH or the instruction header OH, this is prevented from being detected as the header VH or (3H).

As explained above, according to the present invention, it is possible to perform image transmission at high speed and reliably, and furthermore, since the reading section and the mechanical section are directly connected by an optical fiber etc., they can be moved freely. be able to.

[Brief explanation of drawings]

Fig. 1 is a layout diagram showing an example of an image transmission neck device implementing the present invention, Fig. 1 is a line diagram showing an example of data transmission by spatial optical communication, and Fig. 3 is an example of the configuration of a reading unit. Internal configuration diagram, Figure q is an internal configuration diagram showing an example of the configuration of the recording section, Figure 3 is a block diagram showing an example of the configuration of the control circuit of the reading section and the light transmitting section, and Figure 6 is the bit diagram of the data signal. FIG. 7 is a diagram showing an example of the configuration. FIG. 7 is a block diagram showing an example of the configuration of the control circuit of the recording section and the light receiving section. Lt...Light beam, LX...Reflected light from the original, T
DA...image data read by COD, T...blow direction, VD...quantized image data, CD...
Command data, DS...data signal (generic term for image 6 data and command data), FMS/HA/SFM DO path output (pulse FM signal-jt), WOK...writing control clock, B...・Nine directions for document feeding, A... Original reading position,
OKD...Demodulated clock signal, CKW...Write control clock, PS...Parallel pulse signal, VH...Image header s CjH...Instruction header, Vi...Image header detection signal, CH8...・Instruction header detection signal, DTS...Dead time signal. ioo...Reading unit 10/...Sheet-shaped Haraaki, 10λ, 103...
・Feeding roller, 10 Hiro...gra 1. Ten,
ios...Haraaki feed guide, 101...light emitting element,
107... Light receiving element, /DI... Bar-shaped light fl, 109... Reflection mirror, l10... Imaging lens. /ll...0CtD line image sensor, l/λ・
...timing control circuit, l13...0 (3D rough drive path, /#... quantum circuit,
//J...Transmission control circuit, //1...CPU. l17...Memory, itt...Reading mechanism control port, itt...Console input port, jJO...Reading unit top cover /J/...Control console, lco/a~f- ...button button. 12: Command data port, 1: Command data port, 1: Transmission control port, 1: FM circuit,
11 SOO...Recording section GotMo--First recording mechanism, 301B...λth recording mechanism. 301M...30 image memory...Inkjet spatula)" (Ji). JOJ...Inkjet head (red) 1JO41.
...Recording paper storage cassette, 301...Recording paper, 30≦...Paper feed roller, 307
... Guide plate, got-... Registration roller, 309... First conveyance roller, 31O... Platen, 31/... Fan, Ji2.
...Second conveyance roller, Ji3...Suspension roller, J/l-...Conveyance belt, 31j...Output tray, JIt, Ji7
...Ink tank, jJO...Nippon band amplifier, JJ
/-... Demodulation circuit. 3... Timing signal generation circuit 13 3... Serial to parallel conversion circuit, 3... Image header detection circuit, Ji3... Command header detection circuit, 38... Latch circuit, 327-... Gate circuit, J-cot...
・Delay circuit, JIt...OR circuit. :: ``soo...light transmitting part soi...electronic element, 5OJ-...lens. 900...coaxial cable.

Claims (1)

[Claims] 1) Image data read by an image reading section. An image transmission method characterized by transmitting to an image recording unit via a spatial optical communication path. 2. The image transmission system according to claim 1, wherein the light transmitting element connected to the spatial optical communication path is a light emitting diode or a laser diode. 3) An image transmission system according to claim 1 or 2, characterized in that the light receiving element in the spatial optical communication path is an avalanche photodiode.