JPS6336234A - Control method for lighting timing of exposure lamp - Google Patents

Abstract

PURPOSE:To suppress the excess temperature rise of an exposure lamp by turning off the lamp at the time of returning a scanner, setting up the lighting start timing of the lamp to a point of time retoacted by the time required for the rise of the lamp from immediately before the arrival of the scanner at the leading edge and delaying the lighting start timing in accordance with the increase of continuous exposure frequency. CONSTITUTION:The 1st scanner 6 consisting of an exposure lamp 4 and the 1st mirror M1 and the 2nd scanner 8 consisting of the 2nd and 3rd mirrors M2, M3 are arranged under a contact glass 2 on which an original G is set up so as to be reciprocated. Reflected light from the mirror M3 is made incident upon a photosensitive drum 10, through an image formation lens 9 and the 4th mirror M4 to form an electrostatic latent image. Since the rising time of the exposure lamp is shorter when a lamp temperature just before lighting is high as compared to the case of a low lamp temperature under said constitution, lighting is started on the basis of the rising time of the low temperature case at the time of 1st copy. At the 2nd copy and after, remaining heat generated at the time of preceding lighting is utilized and the ignition start timing is delayed from the timing of the 1st copy.

Description

DETAILED DESCRIPTION OF THE INVENTION (Technical Field) The present invention relates to a method for controlling the lighting timing of an exposure lamp.

(Jumei Keijutsu) A scanner that includes an exposure lamp is moved back and forth relative to the document (firl + a) and the cycle is repeated to continuously expose and scan the document! j is known.

For example, for a document mounted on a contact glass, the scanner is started from the center of the scanner, and while traveling a predetermined run-up distance, the scanner rises to a constant speed. Entering the manuscript,
After passing the end of the document, it returns to the home position, and the cycle is repeated.

In the above, the exposure lamp does not need to be turned on during the return, and therefore, it is turned off at the same time as the return. Let it begin.

Conventionally, the timing at which the lightless lamp starts lighting depends on the number of copies, that is,
It is constant regardless of the degree of continuous light travel of the original.

Therefore, 1+11 is applied as it is even if the lighting start timing of the first copy I is applied to the second and subsequent copies, so the residual heat effect in the previous lighting of the exposure lamp w8-
If this happens, the lamp will turn on sooner than necessary for the lamp to rise to the required light intensity.

Since the timing at which the exposure lamp is turned off is determined by the document, the lighting time for each sheet includes the extra time that is not required for the second sheet 1l-1 and thereafter.

In this way, when -FK becomes larger than required for one lighting time, the heat generated by the lamp causes the lamp to rise in the vicinity of the lamp, and the bamboo (τ
The hot water temperature rises significantly near the scanner's home position, causing faster wear of parts, and
/I! This creates a sense of wasting electricity at a single cost.

(Purpose) Therefore, the purpose of the present invention is to prevent excessive flooding of road light lamps.
It is an object of the present invention to provide a mechanism for preventing exposure lamp lighting.

(Structure) In order to achieve the purpose stated in "Non-inventiveness", the path light lamp is turned off when the scanner returns, and the time when this joining lamp starts lighting is set from the time of internal cutting when the scanner reaches the lead edge. Assuming that the road light lamp has reached the point when it is ready to start up, the lighting start time should be delayed as the number of repetitions of continuous exposure scanning increases. This is a characteristic feature.

Hereinafter, a detailed explanation will be given based on one embodiment of the present invention.

In Figure 1, which explains the busy copying process that favors the implementation of uninvented inventions, the reference numeral 2 represents a contact glass, and the reference numeral G represents a manuscript f. Furthermore, below the contact glass 2, there are installed a mirror 1 scanner 6 consisting of a path light lamp 4 and a spear 1 mirror M1, and a fan 2 scanner 8 consisting of a spear 2 mirror M2 and a spear 6 mirror M3, which can move freely back and forth. In addition, the imaging lens 9 and the f4 mirror M4 are fixed and damaged.

The reflected light from the document G illuminated by the path light lamps 4 then passes through the mirrors M1, . 472 Mirror M2.

]・6 mirrors M3 k to the imaging lens 9, and further, 4 mirrors M4 to the photoconductor drum 1oVC.
Being deceived, the power of peace and power is mutually maintained. This silent image is converted into a DJ +y image by the developing sleeve 12, and this visible image is transferred to the transfer paper Sl'r to obtain a copy.

]・1 Scanner 6 has a home position HPK which is usually set to the right of contact glass 2.

During exposure scanning, the spear 1 scanner 6 moves to the left from the home position HP to start a fast reaction, and becomes a constant speed state while traveling the approach distance to reach the lead edge E. In this constant λD4 state, the document surface is After eating the fin light run,
Return part RT K to change the direction of travel, 2~ at the time of action
Return home 7 HPK at 5 times the return speed.

Note that the 172 scanner 8 is 1/1/1 of the A.1 scanner 6 in order to maintain a constant optical path length with respect to the lens 9.
The mouse is supposed to move 2 strokes.

Next, let's take a look at the blinking timing of the road light lamp 4.

Unless 71 scanner 8 returns? It is necessary that the exposed exposure lamp 4 is turned on while the 3.1 scanner 8 reaches from the home position HP to the lead edge LEK, and that it remains up to the required light intensity level. Therefore, when the spear 1st gunner 8 is at the home position, the exposure lamp 4 is turned on, and
After lighting the lamp 4, the sum of the standby time during which the 1st scanner 6 is waiting (stopped) at the home position HP and the run-up time required for the 1st scanner 6 to travel from the home position to the lead edge is exposed. U/P4
It needs to be larger than the rise time of . Note that, in general, the waiting time is several times longer than the run-up time.

Therefore, the standby time is determined by the rise time of the path light lamp 4. Here, the rise time varies depending on the temperature of the lamp itself at the time of lighting.

In other words, the rotation of the path light lamp itself just before the non-light lamp turns on when copying a single sheet of 1" per original is as follows:
The temperature of the hot water in the environment determined by h'r where the copying machine is installed is several liters (higher than that, but relatively low, but 2
During sheet copy y+), the temperature of the exposure lamp in 6-1 lighting is higher than that for the second sheet, because the heat generated when the first sheet is turned on is higher than that for the second sheet. It has a knitting width. The same goes for the 6th and subsequent pieces.
There is a tendency for the temperature of the first sheet to decrease, and the difference in the second sheet decreases.

Generally, the rise time of an exposure lamp is shorter when the temperature of the lamp itself immediately before lighting is high than when it is low.

Therefore, when copying the first sheet, the copying machine's operation "d J
*The timing to start lighting the exposure lamp 4 is set based on the "rise" time when the temperature is at the lower end of the temperature range, and the timing for starting the lighting of the exposure lamp 4 is set based on the number of repetitions of continuous light scanning after the second copy. Since it is possible to shorten the rise FIlf interval by using the residual heat from the previous lighting of the exposure lamp 4, the residual heat can be effectively utilized by setting the ignition start timing later than that for the first copy.

For example, if the exposure lamp rise time for the first copy is 300 m5ec, the rise time for the second copy will be 180 m5ec due to the residual heat effect.
Since it is shortened to ec, the ignition start timing is set later by that amount.

The lighting of the exposure lamp starts at 11F' at the earliest during image formation on the 11i day, and thereafter it can be delayed depending on the number of repetitions from 1 to Vζ, increasing the number of stock reversals)jji'+:
When yl: comes, it converges at a certain time.

In addition, according to the experiment, what happens after the second copy? 11.1 The shortening of the time between 2 and 11.1 of the light lamp is so great that each cycle becomes the time to start the ignition of the light lamp.

The following contents will be explained using diagrams.

In Figure 2, the state of motion of South 1 Scanner 6 is changed @
20. The blinking state of the exposure lamp 4 is shown by a curve 40.

Furthermore, in Figure 1, one copy of the exposure lamp 4's ☆ yah - January viscosity at the time of 111 yh phototaxis Vc is Tl
tl, same 2 pieces]Tgo, 3)lK I-1w
:uge4))'72,,,)-ri(activity 1 each
゛1 (2, TR6, point 9 of exposure lamp 4 at the time of 9th run on 1 copy 11:]' T81 between 1i = r, same lighting 1 on 2nd copy 11. 6th copy) .I
Ji 1. ! ] respectively in TS2. If TS5, then there are the following relationships: TR1>TR, 2>TR5 and TS1>TS2>TS3.

The specific setting of the ignition start time of the photosensitive lamp is carried out, for example, by the CPU program that executes the copying process, in accordance with the contents explained below.

(Effects) According to the present invention, since the unnecessary lighting time of the exposure lamp is shortened, it is possible to suppress the rise in the device temperature (especially the temperature near the home position and the lead edge) and to save power consumption. It is possible and convenient.

[Brief explanation of the drawing]

Figure 1.1 is an explanatory diagram of the light optical system in a copying machine suitable for carrying out the present invention, Figure 2 is an explanatory diagram of the flashing timing of the exposure lamp,
Rise time? It is a timing chart explained in relation to the movement of the Sugyaner. 6...spear 1 scanner, 4...y? light lamp, L
E...Lead Engine.

Claims (1)

[Claims] In a copying machine that continuously exposes and scans an original by repeating a cycle of reciprocating a scanner having an exposure lamp relative to the original, the exposure lamp is turned off when the scanner returns, and this invention The lighting start time of the exposure lamp is set at a time when the time required for the exposure lamp to rise is set back from the time immediately before the scanner reaches the lead edge, and the lighting start time is delayed in accordance with the increase in the number of repetitions of continuous exposure scanning. A method for controlling the lighting timing of an exposure lamp, characterized by: