JPS5818668A - Method and device for controlling luminous intensity of fluorescent lamp for copying machine - Google Patents

Abstract

PURPOSE:To control a light source for destaticization a photoreceptor to successively constant luminance intensity, by controlling a cold cathode type fluorescent lamp for electrostatic charge removal according to the detected amount of light. CONSTITUTION:The luminance intensity of a cold type fluorescent lamp 50 which form a light source for destaticization a photoreceptor is detected by the light-quantity detecting means 56A of a luminance intensity control circuit 56 to control a lamp current control means 56B. Consequently, feedback control is so exercised that a supply current to the fluorescent lamp 50 which has a large heating value and varies in supply current and luminance intensity linearly is held constant, and consequently the luminance intensity of the fluorescent lamp 50 has a stable specified value successively, thereby performing the uniform, stable, and excellent destaticization of the photoreceptor.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a photoconductive photoreceptor E hereinafter abbreviated as photoreceptor 9, b)
This invention relates to the control of the luminous intensity of a cold monopolar fluorescent lamp, KMI/m, in an electrostatic copying apparatus (hereinafter referred to as a copying machine) using a photoreceptor surface.

In photocopying machines that use a photoreceptor, a static charge is uniformly applied to the surface of the photoreceptor;・Form an image,
Image the image of Scissors and print it on the photoreceptor 1111K). The purpose of transcription is achieved by uniformly transferring the scissors toner image onto a transfer material such as transfer paper, and further fixing it.

111th, the copying machine part according to the present invention is shown. ◎W is a photoreceptor (illustrated as a drum), 101 is a charger such as a discharger that strikes, and 102 forms an electrostatic charger. Eme optical system exposure device, 10B is a larger 5uu that generates toner images
s, D is a transfer paper placed on a paper feed type, 104 is a paper feed for supplying a sheet of paper D to a photoreceptor 1011i1, 10B is a transfer of toner onto a transfer paper r, and a toner image is transferred to a photoreceptor 1011i1. A transfer/separation electrode separates the transferred transfer paper from the surface of the photoreceptor 10, and lO6 is a tarliner that removes residual toner from the surface of the photoreceptor W after the toner image has been transferred.Removal of residual charges is good. In order to obtain a good image [41], it is generally performed by exposing the photoreceptor IOP image to light using photoconductivity (hereinafter referred to as photostatic discharge).
Optical charge removal is not only used to prepare the photoconductor 10 to be electrostatically uniform prior to charging at 101 K, but also to remove static charges outside the document area of the photoconductor 1011. Alternatively, it is also used to remove excess static charge other than the toner image before transfer.

In FIG. 1, reference numeral 11 denotes an optical static eliminator located in front of the charger 101 to remove static charges on the surface of the photoreceptor 10 or to equalize fatigue deterioration of the photoreceptor 10; Alternatively, by removing the static charge that is charged outside the document area during reduction copying, it is possible to remove the toner that is not used for copying, but instead becomes a black frame for the artist and spoils the image quality.
This is a partial exposure device for preventing the photoreceptor from adhering to the surface of the photoreceptor 10 and being removed and consumed. Further, reference numeral 13 is located between the developing device 103 and the transfer separation electrode 1050, and is used to adjust the amount of charge on the surface of the photoreceptor 10 before transfer to improve the transfer rate of the toner image and the separation rate of the transfer paper. The above-mentioned photocathode 11 < 7 partial exposure device and pre-transfer exposure device 13 which are exposure devices
As a light source, an incandescent bulb that emits incandescent light from a filament, a light emitting diode (LID), or a fluorescent unit is used. Among these light sources, incandescent bulbs and LIDs are used in multiple units to illuminate the required area. Because it is necessary to line up the lamps, the luminous intensity distribution becomes uneven, causing uneven photostatic charge removal and uneven light fatigue on the photoreceptor. However, there is a risk of causing deterioration of the photoreceptor.On the other hand, fluorescent lamps have the above-mentioned drawbacks and are not good sources of light for eliminating static electricity.However, the vapor pressure of mercury within the tube is large 1 (changes by am, so the tube ll1m1!
Since the luminous intensity strongly depends on the temperature of
The horizontal axis is temperature (0) However, temperature is the tube wall temperature, which is approximately proportional to the tube internal temperature. It shows 0 IL overload in the tube of the fluorescent lamp, conditions inside the copying machine, the installation location, the ambient temperature of the fluorescent lamp, which varies depending on the season, etc. Although the heat generation is small compared to the incandescent light bulb, Fluctuations occur due to an increase in the temperature inside the tube due to the heat generated by the large discharge current. ) and other inconveniences often occur when the internal temperature of the fluorescent lamp is low.Because of the heat generated by the ToL phosphorescent discharge current, the situation varies depending on the lighting time. WI to avoid uncertainty
As a member of ISI 11, there is a direct relationship between the lamp current and relative luminous intensity of cold cathode fluorescent lamps (hereinafter referred to as cold electric lamps) and cold III lamps. Fourth
The relative luminous intensity when the luminous intensity with respect to the lamp current of the 11IIKS lamp is taken as 100 indicates the dynamic current of the lamp. No. 311 shows the O-cough cooling II lamp and its surrounding circuit, which is small in volume and inexpensive because it does not require a lighting auxiliary device. l! K or - is a cold cathode lamp, 4 is a cold cathode fluorescent tube,! 2jiP and d are nine electrodes installed at both ends of the fluorescent tube 4, 23sP and d are caps, and 624 is a proximal conductor, as shown in the example in FIG.
From one electrode n to the other electrode d, the fluorescent tube 4
A resistor for controlling the lamp current is inserted between the cold cathode lamp and the arc length along the outside II (atmosphere side) K, and is in contact with the electrode η'. When a voltage of 300 to 700 mm is suddenly applied to the terminal, a discharge phenomenon occurs between the adjacent conductor and the adjacent electrode d, which acts as a trigger and momentarily continues between the electrodes n and d. A discharge occurs and the light is turned on.
The lamp current required for standard discharge is 1xlOm, which is extremely small compared to the lamp current of several hundred meters for ordinary warning lights, so the self-heating caused by the lamp current is almost ignored, and the fluorescent tube The temperature of B is almost the same as the ambient temperature.

As mentioned above, electric lights have many advantages over ordinary warning lights, but since the principle of light emission is the same as that of ordinary warning lights, the first thing is that the luminous intensity depends on the temperature!
This is the same as shown in IIK.However, in the case of a lou electric lamp, mineral self-heating is almost ignored, and the relative luminous intensity is approximately proportional to the lamp current, so the luminous intensity of the warning light can be easily adjusted by controlling the lamp current. On the other hand, in order to provide copies of good image quality and avoid the trouble caused by jamming, the optical static eliminator 11 described with reference to FIG.
The light intensity of the 4D demand light onto the photoreceptor from the partial exposure 11112 and the pre-transfer exposure aIu needs to be suppressed within a practical allowable range. There is no proposal to keep K within a certain range.
The object of the present invention is to provide a method for keeping the light intensity constant, and furthermore, to provide a device based on the method for continuously keeping the light intensity constant. In the apparatus i, a cold cathode warning lamp is used to remove static charge from the surface of the photoconductive photoreceptor, and a first detection lamp is used to detect the amount of light from the cold cathode fluorescent lamp; a second step of controlling the lamp current of the cold cathode cover wall lamp by using an output corresponding to the first detection output as an input; Furthermore, in a copying machine K or i that uses a photoconductive photoreceptor, a cold cathode cover wall light lamp is used to remove static charge from the surface of the photoconductive photoreceptor. A fluorescent lamp for use with photographic scissors, comprising a detection means and a lamp current control means for controlling the lamp current of the cold WK1 haze fluorescent lamp by inputting an output corresponding to the output of the light quantity detection means. This can be achieved by a light intensity control method.

1 Preferred examples of the light intensity control device are as follows:
By making the predetermined luminous intensity correspond to the lamp current that produces the luminous intensity, the detection output of the light amount detection means when a predetermined luminous intensity is detected is used as a reference output, and this is used as the lamp current. Next, the present invention is shown as a block diagram in FIG. ! s6A is the first process that detects the light intensity of the electric lamp (arrow Φ indicates the output) and outputs a proportional output, and 56B detects the output of the first process (arrow @ indicates the output) to a predetermined luminous intensity (light fK). Control the lamp current of the electric light (equipment) by comparing it with the phase e!
1) The second process o 57 and 5B are the first process
The input terminal for externally adjusting the 20th filter 56B is the cold cathode lamp source, which is the input terminal for adjusting the 20th filter externally. The amount of irradiation light at that time is input in the first process, the output at that time is input to the second process as a reference value, and in the second process, this j
In response to the input from the llE1 process, the lamp current is adjusted so that the lamp has an appropriate luminous intensity.0 The adjustment of the appropriate lamp current for the appropriate luminous intensity is performed in the first process even in the second process. Even if it happens in my sleep.

If the luminous intensity of the lou electric lamp changes due to temperature fluctuations, cold @ electric lamp power fluctuations, etc., the amount of light irradiated! and the input to the first filter changes. l! As a result, the input from the first process to the second process becomes a fold, and in the second process, the input changes so that the nine inputs correspond to the above-mentioned appropriate luminous intensity, the reference value is measured, and the amount of displacement is fed to the lamp current. Works like a grasshopper.

Similarly, the light intensity control method using the light amount detection means of the present invention can be explained using the same block diagram as FIG. 56 is the light intensity control method of the present invention, s6 is the light amount detection means, 9 is the light amount detection means and amplification including the road condition, and 56B is the lamp. It is an electric field control means◎
The cold cathode lamp and the light intensity control device Js field are operated by a separate electric wire [The zero light amount detection means S6 which is operated by K is used to detect the light amount of the irradiated light from the cold electric lamp (arrow), and the detection result is transmitted with a loud magnitude. Convert it into an electric signal and input it to the lamp current control means 5611K (arrow O) Run 1 current control means SOB Fi Control the resistance and voltage of the cold cathode nails based on the size of mosquito entry. ), decreases and maintains or increases the lamp current, and thus controls the luminous intensity of the electric lamp, which has a direct relationship with the armpit lamp current. and armpit light-receiving element is
t) A photodiode, a phototransistor, etc. can be conveniently used.

Various circuits are conceivable as the circuit used for the light amount detection means 56, but as an example, as explained in the operation explanation in FIG. However, it is also possible to generate a voltage change according to the concentration of this resistance value and use it as an input to the Langden*si control device. The light intensity is controlled by adjusting the resistance, voltage, and voltage of the operating power supply circuit of a lamp and increasing the lamp current.For example, the lamp current control means includes a 7-oto coupler, and an F-lance current control circuit. You can adjust the luminous intensity by controlling the lamp current of the light by incorporating the light intensity detection means 56. When the size is adjusted to 56 mm, it is output as a detection output, inputted to the lamp current control means 66B, and becomes an output for controlling the lamp current of the cold electric lamp. By considering the element, the control element, and the circuit, the direction of movement of the lamp current control means 58m is made to match the control purpose. Among the luminous intensity control methods, the switching method is simplified so that the rising current decreases when the light rises.There are factors that affect monotonous effective luminous intensity, such as dirt on the surface of the photoreceptor, etc. The light intensity control method of the present invention can be used to increase the light intensity when the light intensity increases or decreases. However, if a light intensity control device is to be put into practical use, IIIK is most preferable to use a light source such as the above-mentioned static electricity removal sound, partial exposure, or a pre-transfer vibrator, which is capable of performing static electricity removal in accordance with the regulations. Place □ Determined light 11mK11
This is because there are variations in the performance of each product in the luminous intensity control method for electric lamps and photosensitive sensors, and the variations vary depending on the degree of use and period of use. is a light amount detection means s6 in order to set a predetermined light intensity by eliminating the various performance C variations.
Adjusting the comparison control path in %fh company 86B, such as adjusting the resistance (not shown) between the light amount detection means S6 and the lamp current control means SOB.
At X':), the lamp current controller 11s-1 is activated, and a lamp current (abbreviated as specified current) that produces a predetermined luminous intensity is supplied to the electric lamp. The output from the light amount detection means S6 when a nine light amount corresponding to a predetermined light intensity is detected is set as a reference output, and the predetermined light intensity is maintained in response to the displacement of the output of the light amount detection means from the reference output. Therefore, it is also possible to use a lamp current control means that increases or decreases the lamp current.Next, an embodiment of the present invention will be explained. This is an example of the implementation using a photocoupler formed in O.
is a maintenance resistor provided in the circuit between the electric lamp ω and the transformer 60, 0 brocade is the luminous intensity control device of the present invention, and 661 is the C series #-
#, 66j! is a circuit section that has functions such as increasing/decreasing the magnitude of electrical hexagonal signals, comparing, adjusting, etc.
The reef S cell becomes the circuit resistance of the light ω, p, LID
Or, which receives light from the circuit and changes its resistance to change the lamp current, is a variable resistor, and the circuit 66! ! The output of Oυ!
When the current is constant, adjust the current to the photocoupler 6-1 and set the system of this luminous intensity control device so that the specified current is given to the luminous intensity. It is preferable to install the optical element near the center of the lamp in the direction of the tube axis. Therefore, when the light intensity decreases from a constant current of 1m due to deterioration of the electric light 61, etc., the light intensity decreases from the predetermined light intensity to the light receiving element cas-.
This change causes the output OUT to decrease through the circuit section 662. As a result, the lighting current of the LID of the 7 Otokatsura 663 increases, increasing its luminous intensity, thereby decreasing the resistance of the C68 cell of the photocoupler 663, which forms the circuit resistance of the Lou electric lamp, and increasing the lamp current. Control the cold light to a specified appropriate luminous intensity. ◎If the lamp current of the cold light increases more than the specified current, and the amount of light irradiated increases due to a change in the ambient temperature, the operation is the opposite of the 1st control. 〇Next, Fig. 7 shows an example of -am of the light intensity control device S surrounded by the broken line in No. 6E. 076 is the light intensity control device, and 761 is the C straight 8
The cell 763 is a part of the photocoupler.If the luminous intensity of the electric lamp decreases for some reason, and the irradiation luminous intensity also decreases, the amount of light directed to the cis cell 761 from the light intensity detection element installed in the vicinity decreases, and Correspondingly, the resistance of the CaS cell 761 increases, so the V voltage increases, and the input voltage to the operational amplifier Or etc. increases.As a result, the voltage decreases and the photocube 7
0 to increase the current to Lllll17631 of 63
Then, the CaS cell 76 that enters the energizing circuit of the light bulb
32, the lamp current is increased, the luminous intensity of the lamp is increased, and it is controlled to maintain a predetermined amount of light. Kenkame (t...t1 kō 5 o 1.).

The operation of this Il@ has been explained above based on one embodiment, but it is of course not limited to the above-mentioned example, and various light receiving elements, aSS configurations, and adjustable lamp current control means can be applied. be.

According to the present invention, when the static charge on the photoconductor is removed by light, a cold lamp is used, which is easy to control the light intensity, and it is possible to provide the optimum amount of light to the surface of one photoconductor. This was achieved by detecting the amount of irradiated light and correctly feeding the fluctuations into the lamp current of the cold lk@ lamp. Needless to say, the present invention can be applied to control the light amount of the light source for exposure in the case of 9-9 days.

[Brief explanation of the drawing]

Fig. 1 is a partial explanatory diagram of the configuration of a general compound zero machine, Fig. 28 is an explanatory diagram of the temperature of a fluorescent lamp, and Fig. 4 is an explanatory diagram of the temperature of a fluorescent lamp. The lamp current, S vs. light intensity curve is 0
Figure S is a 10-step diagram for explaining the method and apparatus of the present invention, No. 61! 11 is a functional explanatory diagram of an embodiment of the present invention. ・Figure 7 is an example of a specific circuit of the light intensity control device part in the 6th garden KsP ◎ 10... Photoreceptor 11... Optical static elimination l! 12... Partial exposure device l... Pre-transfer exposure! 20, 50 and 60
...Cold cathode lamp...Proximity conductor b and 65...
Transformers 66 and 66...Light intensity control device s sound...Light amount detection means 56B...Lamp current control means 661 and 761...Dawn light element 662.
...Circuit part 663 and 763... Photo Cub Two Agent Yoshikane Kuwahara vJ1 Figure 11 ◆ Marochi 1 笈 (・Roku →) Hollow 14I! I boar TRI

Claims (1)

[Claims] (1) In a single-zero device using a photoconductive photoreceptor, a cold cathode fluorescent lamp is used to remove static charge from the surface of the leading conductive photoreceptor. A first process of detecting the amount of light from the lamp 6, and controlling the electric waterfall of the cold-polar fluorescent lamp 9 by using the output that echoes the detection output of the third one as input.
A method for controlling the luminous intensity of a fluorescent lamp for a copying machine, which involves linking the process of The fluorescent lamp includes a light amount detection means for detecting the amount of light from the calming-pole fluorescent lamp, and a two-amp electric current of the cold one-pole fluorescent lamp, with an output that is similar to the output of the fluorescent light amount detection means as an input. A method for controlling the luminous intensity of a fluorescent lamp for a transcription machine, which comprises connecting a current control means for controlling a waterfall. A method for controlling the luminous intensity of a fluorescent lamp for a copying machine according to claim 2, wherein the lamp current controller/stage is configured to be adjustable so that a lamp current corresponding to the luminous intensity can be applied. Claims further comprising a lamp current control means that uses the output of the light amount detection means when the polar fluorescent lamp has a predetermined luminous intensity as a reference output, and receives as input the amount of displacement of the detection output from the standard output. Luminous intensity control device for fluorescent light and lamps for printing devices as described in Section 3 of Section 3,
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