JPS58139558A - Original reader - Google Patents

Abstract

PURPOSE:To shorten the preheat condution time to realize a reduction of power consumption and a long lifetime of a fluorescent lamp, by preheating a light source for original reading with the output signal of the 1st detector and lighting up the light source with the output signal of the 2nd detector. CONSTITUTION:The 1st detector 3 provided at a place near the entrance of an original reader detects that an original 1 is inserted. Then an original feed roller 2 is driven to feed the original 1 up to a prescribed position. The 2nd detector 4 prescribes the reading position of the original 1, and the feed of original is discontinued with the output signal of the detector 4 to wait for the start of reading. Some time is required for the original to reach the detector 4 via the detector 3 and then to reach the original reading postion P via the detector 4. Therefore this time is used for preheating. As a result, the power consumption due to the constant preheating is eliminated, and at the same time the constant conduction of filament can be discontinued.

Description

[Detailed description of the invention] The present invention is for L self-manuscript reading in a facsimile machine or the like.

The present invention relates to an improvement of a reading device, and particularly relates to a lighting control device for a document reading Jfl light source.

NonoT' is used for manuscript drafting/first-picking devices such as facsimile machines.
I and i' lights (luminescent lamps) are often used, but the on/off control of the luminescent lamps, especially the one beat required for turning them on (lighting up), depends on the environment (ambient temperature). When the temperature is low, it takes a long time 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.

In addition, the method of preheating this filament is C, DC 1,
Methods such as alternating current and high frequency for blue are generally known, but these preheating methods not only shorten the time until lighting, but also extend the life of the luminescent lamp, stabilize the change in light, etc. There are strong advantages. However, in facsimile machines and the like, this preheating is performed constantly at the power source, so when the power is on standby, the power required to preheat the luminous lamp is consumed. Since electric current is passed through the filament all the time, there are drawbacks such as the impact on the life of the luminescent lamp.

The present invention was made in consideration of the actual situation such as -hijd, and preheating is started after 4 degrees when the original is set in the original reading device, the original is fed, and the original is placed at the marking position. The time it takes to reach the filament is set as the preheating time, and the light is turned on when it is detected that the original has reached the one-catching position, thereby shortening the preheating time for the filament and saving power. IS:J aims to extend the lifespan of fluorescent lamps.

FIG. 1 shows the main phases 1118 and 1 when the printing device according to the present invention is applied to a facsimile machine.
Support 11゛, 1 in I, 1 is a document, 2 is a document feed roller, 3 is a first detector, 4 is a second detector, 5 is a fluorescent light,
61d document holding plate, 7 is target glass, 8i1: mirror, arrow A is the document conveyance direction, point P is 1<! , the draft position is shown, and as shown, gon,
Near the entrance of the reading and taking device, there is a frame/hanger 3 that detects whether or not a document has been inserted. When this is detected, the roller 2 is driven by a drive system (not shown), for example, a pulse motor, and the document 11I'j' is fed to a predetermined position W.Fourth, in order to define the document reading position, a second roller 2 is driven. A detector 4 is provided, and the feeding of the document is stopped midway by the output signal of the second four-way hoist.
Poetry, l17. Wait for h to start. This reading starts after the handshake with the receiving 4MP, which is when the copy mode product (in one machine (8), mode with the reading → writing function) starts, and the original is There are 4A and C cities in the command center. As described above, the document passes through the first detector until it reaches the second detector, and the position where the document reaches a pH constant after passing through the second detector; It takes time iJl to reach position P, so if this time is used for preheating, it will always be preheated.
l'+', it is possible to stop wasting power and at the same time stop constantly energizing the filament due to constant preheating.

2 is a diagram showing an example of an electric circuit used in carrying out the present invention, and FIG. 3 is a time chart for explaining the operation of the bow 1. In the figure, 3 indicates the first detector, 4 5 is a second cotton hanger, 5 is a fluorescent lamp, and 9 is a fluorescent lamp lighting device. to preheat the fluorescent light 5 as shown in Figure 3 (
(see Fig. 3(b)), output signal b of the second detector 4 (see Fig. 3(b)
)) to drive the fluorescent lamp lighting device 9 to turn on the fluorescent lamp 5 (see Fig. 3(d)). or reading, position)
The time required for the document to be fed from the first detector to the document reading position is determined by the relationship between the distance at -+ and the document feed speed by the drive thread, and the time required from the start of preheating until the light turns on. By configuring the document A':i' printing device as described above, the preheating time can be reduced to a small amount, resulting in power savings, and the fluorescent light can be used for a long time. can be achieved. The lighting device shown in Figure 2 is a device that generates the preheating power and lighting power necessary for the firefly lamp using an input power source (direct or alternating current). Power is supplied to the fluorescent lamp 111, and the electricity γ1 required to light the signal is already
It has a circuit configuration that can supply 111 prefectures to Eikoto.
The output of the first detector (iJ % is used for preheating control, but it is not limited to this. For example, the output signal of the first detector can be used to turn the input power on and off, and the input power is When turned on, the lighting device preheats the fluorescent lamp and
The solar light may be turned on by the output signal of the detector. Furthermore, although Fig. 3 shows the control timing using continuous signals, if a latch circuit is provided inside or outside the lighting device, "preheating", "1 lighting", "lighting off", and "preheating shutdown" can be controlled. The same operation as described above can be performed using a trigger pulse.Furthermore, in No. 31'y+ (c), the dotted line indicates the case where preheating is cut off after lighting, and when turning off the light, the output signal of the second detector is This can be done by setting it to low level.

As is clear from the above explanation and Akira, according to Honwa: Akira,
The preheating time of the fluorescent lamp for reading the original of the original reading device is shortened to the time required for reading the original by 1% of the time required for preheating.
; It has the advantage of saving power and prolonging the life of the fluorescent lamp.

[Brief explanation of drawings]

Figure 111. 2 is a diagram illustrating an example of an electric circuit used in the implementation of the present invention, and 3
This is a time chart for explaining the operation of the electrical and electrical circuits in FIGS. 1ri and 2. 1. Original, 2. Roller, 3.. First detector, 4.
- Second detector, 5 - Fluorescent lamp, 9. Fluorescent lighting device.

Claims (1)

[Scope of Claims] A first detector provided in a document insertion slot of a document reading device and configured to detect the presence or absence of a document, and a second detector that defines a document reading position and detects the presence or absence of a document. and reads the original using the output signal of the first detector. An original It-t-taking device characterized in that a light source for taking is preheated and the light source is turned on by an output signal of the second detector.