JPS58139559A - Original reader - Google Patents

Abstract

PURPOSE:To shorten the preheat conduction time to realize a reduction of power consumption and a long lifetime of an electric discharge lamp, by preheating the discharge lamp when the presence of an original is detected by a detector and then lighting up the discharge lamp before the original is read. CONSTITUTION:An original 1 is set and then detected by an original detector 3, and a driving system is driven by the detecting signal of the detector 3. Thus the original 1 is fed toward an arrow A. When the original 1 reaches its reading position, the feed of the original is stopped by an original detector 4 to wait for the start of reading. The reading is started after the hand shake with a receiver or when a start button is pushed in a copy mode. Meanwhile the original 1 is held. Thus some time is required for detection of the original 1 by the detector 3 through the start of reading, and this time is used to preheat a fluorescent lamp. As a result, the electric power is eliminated for the constant preheating, and at the same time the time of constant conduction to the filament due to the constant preheating is shortened. This can incease the lifetime of the fluorescent lamp.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an improvement of a document reading device in a facsimile machine or the like, and more particularly to a lighting control device for a light source for document reading.

Discharge lamps (fluorescent pairs) are often used in the origin reading and taking devices of facsimile machines, etc., but the on/off control of the fluorescent pairs, especially the time required for turning them on (lighting up), depends on the environment. At low temperatures, it takes a long time -5 hours to turn on the light.

Therefore, generally, the filament is preheated.
We are trying to shorten the time it takes for the lights to turn on.

Incidentally, methods such as d1 current, alternating current, W, or high frequency are generally known as methods for preheating the filament, but these preheating methods only shorten the time at lighting temperature. There are divine chief M's such as extending the lifespan of the Koukou lamp and stabilizing the illuminance. However, 7. In facsimile machines, etc., this preheating is always performed at the source, so power is consumed to preheat the fluorescent couple. During this time, current is flowing through the filament, which has the disadvantage of shortening the lifespan of the fluorescent couple.

The present invention has been developed in consideration of the above-mentioned actual situation, and in particular, when the original is set on the original reading device value, preheating is started, the original is fed, and the original is read. Reach position and then control? A reading start command is issued from the ill device, and the time until the beginning of Yi taking of the original is defined as the pre-rho time, and a fluorescent pair is lit at IL'3 at the beginning of Mlt taking of the original at 1114. In this way, the preheating time for the filament can be shortened and the foil '+i'
i', it is one thing to increase the lifespan of the fluorophore and the fluorescent couple. The time from preheating to lighting is usually about a few seconds, and the time from preheating to lighting is set to n seconds. After it is detected that the jrf1 original is set, the original is fed, and the first original is read. Reach the position and read the manuscript.

It is good to have more than n seconds in the trench where the crawling starts.

Fig. 1 is a schematic diagram of the main parts when the document reading and taking device according to the present invention is applied to a facsimile machine. A document detector installed near the document entrance; 4 is a temporary document detector that defines the reading position of the document; 5 is an IL lamp (
Luminous lamp), 6 is the original holding plate, 7 is the target glass, 8
is a mirror, and when the original 1 is set in the original reading device, the original 1 is detected by the original detection 53, and the detection signal causes the drive system shown in Table 1 (generally a pulse motor) to The original 1 is fed in the direction of arrow A. Typically! /: [, It41 In order to define the reading 1 position of the manuscript, another manuscript 4 or usufruct 4 is provided, and when the manuscript reaches a predetermined position, for example, the manuscript reading position P,
Stop feeding the original and wait for the spell removal to start. This reading starts after the handshake with the receiver, and when my father turns on [1] the start race in copy mode (a mode that has the function of reading and recording on one machine). The start button is turned on to start reading, and the document is stopped by these commands.

As described above, the original IE 4' installed near the entrance
Since it takes time for the fender 3 to detect the document, feed it, and start reading, if this time is used as the preheating time for the light emitting lamp, there is no need for electricity for constant preheating. Constant energization of the filament also reduces the time required for a short period of time, extending the life of the luminescent lamp. The time d'' required for the document 1 to be detected by the document detector 3 installed near the entrance as described above, the document 1 to be fed by the drive system and reach the reading position, and for the document to be actually read is The time needed to preheat the light emitting lamp and turn it on is sufficient, and since a normal light emitting lamp can be turned on in more than 2 seconds, this is sufficient time to preheat the light emitting lamp.

Fig. 2 is a diagram showing an example of the electricity +1'5'l path used in carrying out the present invention, and Fig. 3 is a time chart for explaining the operation of Fig. 2. A document detector installed near the entrance of the reading device; 5 is a light emitting lamp; 9 is a light emitting lamp;
10 is an OR circuit;
One of the input terminals of the fax machine receives a handshake signal (a signal indicating that the connection with the receiver is OK and communication is possible; on the facsimile machine, reading is started as necessary after the handshake is completed). ), but the copy mode command signal (copy mode is not activated while the facsimile is communicating, and this copy mode command signal is not input during communication) is input to the other input terminal. There is. In FIG. 2, the lighting device 9 has an input power source (
It is a device that generates the preheating power and lighting power necessary for the luminous lamp 5 using direct current or alternating current).
The power required for preheating is supplied to the luminous lamp by the signal b (see Fig. 3(c)), and the power necessary for lighting is supplied to the luminous lamp by the signal b (see Fig. 3(b)) (see Fig. 3(c)). (d)) circuit configuration.In the offshore circuit configuration shown in Fig. 2, the output signal of the document detector 3 is
, 6. It is used as a control signal, but the input power is turned on and off by the output signal of the detector 3, and when the input power is turned on, the light emitting lamp 5 is turned on from the lighting device @9. The light emitting lamp 5 may be turned on after preheating and after handshaking or by operating the copy mode switch button. Also,
The example shown in FIG. 3 shows the control timing based on a continuous signal, but if a latch II5+ path is provided inside or outside the lighting system, "preheating", "2 lighting", "lighting off", Figure 3 (c) shows the case where the preheating is turned off after boiling and turning on the light, and turning off the light is done by turning off the light +3b. This can be done by setting it to low level. Furthermore, if control is performed such that the signal level is set to high level for the duration of the lighting period, it is possible to turn the lighting on for any desired length of time.

As is clear from the above description, according to the present invention, the preheating time of the document reading fluorescent lamp of the document reading device is shortened to the necessary minimum time, and the power required for preheating is saved. This has the advantage of extending the life of the luminescent lamp.

A simplified diagram of the drawings 4 (1, Figure 1, Figure 1, 1D, Storage) 1. A schematic configuration diagram of the main parts of the device, Figure 2, describes an embodiment of the document setting and taking device according to Figure 1. A diagram showing an example of an electric circuit used to implement the present invention,
Figure 3 is a time chart for explaining the operation of the electric circuit shown in Figure 2.

1. Manuscript, 2. Roller, 3.4.. Manuscript hanger, 5
・Fluorescent pair, 9 fireflies) lighting device.

Figure l Figure 2 Figure 3

Claims (1)

[Claims] It is installed in the document insertion slot of the original V8 reading device and has a detector that detects the presence or absence of a document, and at 13W1 when the document light is detected by the nuclear detector, the discharge lamp of document illumination month 1 is preheated, and the J
g. A document reading and adding device characterized in that the discharge lamp is turned on before starting to take the document Mf.