JPS59226372A - Destaticizing device for copying - Google Patents

Abstract

PURPOSE:To select accurately a spectral characteristic with a simple constitution and keep the spectral characteristic accurately to improve the destaticizing effect by irradiating the surface of a photosensitive body with plural light sources emitting lights different in color and constituting a device so that light irradiation regions of individual light sources overlap one another. CONSTITUTION:Since the light irradiation region of each green LED 3G or red LED 3R overlaps light irradiation regions of adjacent LEDs, the spectral characteristic of the light irradiated to a photosensitive body 1 is the synthetic result of lG and lR. If base voltages VG and VR are set to proper values in individual lighting circuits, proportions of the green light and the red light are determined accurately and are held stably. If voltage values VG and VR are made adjustable, proportions of the green light and the red light, namely, the spectral distribution on the photosensitive body is changed optionally. Thus, the uniformity of the spectral characteristic is improved, and the image quality is improved by the destaticizing effect.

Description

DETAILED DESCRIPTION OF THE INVENTION TECHNICAL FIELD The present invention relates to a static eliminator for copying that eliminates static electricity from a photoreceptor by irradiating light onto the photoreceptor.

Device 22 Emission color (spectral distribution) of light used in the above-mentioned filtering device
The following conditions are required for: Namely, first, the color of the emitted light must be within the sensitivity range of the photoreceptor since it is necessary to eliminate static electricity from the photoreceptor. Second, in order to extend the life of the photoreceptor, it must not contain light of a wavelength that would cause fatigue to the photoreceptor. Thirdly, there are no side effects related to electrostatic properties such as residual effects and increased occupancy.

In addition, the light source for generating the above-mentioned light is required to be compact, generate a low amount of heat, have little unevenness, and be able to obtain the necessary amount of light.

Conventionally, as light sources for static eliminators, discharge tubes such as fluorescent lamps and cold cathode lamps, tank light bulbs, LED lights for EL clamps, and the like have been used in consideration of the above-mentioned conditions.

However, in recent years, in addition to the above-mentioned conditions, uniformity of spectral characteristics is required from the viewpoint of the handling process. This is 11 of the reproduction products obtained through the reproduction process! ii) To improve image quality and maintain the enhanced image quality for a long time. in particular,
When using a light source and a fluorescent lamp, the ratio of the green component to the red component must be f:10:1.5.

As mentioned above, in order to uniformly maintain the spectral characteristics of the light source in a desired state, conventionally the spectral distribution of the light source of one species gj is set to a predetermined state, for example, the phosphor of a fluorescent lamp is appropriately selected. I try to get the best color. However, this method has little flexibility and is therefore not versatile for various types of devices.

In addition to the above-mentioned method, it is also known to convert the wavelength of light emitted from a light source by using a filter, thereby obtaining a desired color. However, in this method, the number of components increases by the number of filters, and the spectral transmittance of the filter must be highly accurate, resulting in an expensive device. Further, since light is lost due to the filter, a burden is placed on the light source to compensate for the loss.

Purpose In view of the above points, the present invention is capable of accurately setting a spectral distribution while being inexpensive, and moreover, it is possible to accurately set a spectral distribution shape once set.
2. An object of the present invention is to provide an apparatus (11-) for eliminating static electricity which can be maintained uniformly and which does not place a burden on a light source.

Wataru-12 The present invention will now be explained based on drawings showing embodiments thereof.

In FIG. 1, a printed circuit board 2 is disposed on the upper blade of the photoreceptor 1 to be neutralized, and green LEDs 3G and red LEDs 3R are alternately arranged below the printed circuit board 2. The spectral characteristics of the green LED 3G are shown by the solid line t in Figure 2.
9, and the spectral characteristics of the red LED 3R are as shown by the solid line tR in FIG. In Figure 2, vL
The curve to shown by the line shows the entire spectral characteristic of the orange LED.

As shown in FIG. 1, the light irradiation area of LED 3G or 3R is arranged to be parallel to the light irradiation area of the LEDs on both sides, so the spectral characteristics of the light irradiated onto the photoreceptor 1 are as follows: (Fig. 2) and Ig (Fig. 3). Therefore, if the LED colors are not a combination of green and red but a combination of other colors, a spectral distribution different from that in the above case can be obtained. In particular, LEDs have uniform colors ranging from green to red or infrared (the orange distribution in Figure 2 is an example).
, there is a high degree of freedom of choice.

'rA4 diagram shows LED3G and LED3 shown in Figure 1.
This shows an example of a lighting circuit for R, and as shown in the figure, L E
In the power supply path of D 3 G, the base torque was set to ■9]・Lanzostar Tr1 was placed, and -force LE I)
A trannostar Tr2 whose base voltage is set to VR is arranged in the 3R power supply path. Therefore, by setting the base voltages and voltages to appropriate values, the ratio of green light to red light can be determined to be positive 1ift, and can be stably maintained. It is also possible to change to these. For example, the green component may be increased in response to changes in temperature, or the red component may be increased in response to changes over time.

In this way, in the above embodiment, the light irradiation area of the i-color LED 3G and the light irradiation area of the red LED 3R are overlapped on the photoconductor 1, thereby obtaining a desired spectral distribution on the photoconductor 1. Therefore, there is no need to use a filter as in the conventional case, and therefore there is no loss of light, and the entire device can be manufactured at low cost. Furthermore, if the output and flow supplied to the LEDs of both swords is controlled to be constant, a constant spectral distribution can be obtained at all times.

In the above embodiment, the LEDs of components emitting different colors are arranged next to each other, or the light emitting chip having the green color distribution Lak and the light emitting chip having the red color distribution tRt are arranged side by side, as shown in FIG. It may be used in place of a so-called two-color emitting LED, a c+i- product, which is enclosed in the same case. This two-color emitting LED has an appearance of 1
Although they are formed like two LEDs, the chips inside are completely independent, and the upper electrodes are also independent. If these two-color LED's are arranged as shown in Figure 1, the degree of mixing of the light emitted from each chip will be further improved than in the case of Figure 1, and the mixing ratio can be set freely.

FIG. 6 shows another embodiment of the present invention, in which a green LED array 5 and a red LED array are mounted on the inclined blade of a drum-shaped photoreceptor 1 extending in the direction of force perpendicular to the paper surface. ) array 6
is located. Both power LED arrays 5 and 0.6 are
As shown in the bottom of Figure 7, a plurality of green LEDs 3 each
G or red L E D 3 R arranged in a row,
Moreover, those LED rows are parallel to each other. or,
As shown in FIG. 6, these LED rows have 9116 radiation areas that overlap on the photoreceptor 1'.
Similar to the embodiment shown in FIG. 1, the spectral distribution can be reliably changed or maintained.

The embodiments of the present invention using LEDs as light sources have been described above, but any light source may be used as long as it is color-coded. For example, colored 'l4i1 bulbs, color-coded It is also possible to use fluorescent lights, EL, etc. that are also color-coded.

However, if fluorescent lamps are used in the embodiment shown in Figure 1, it is necessary to color-code each fluorescent lamp, and in the case of Taikihada 6, fluorescent lamps of different colors must be used. Two pieces are required.

Effects As described above, according to the present invention, since the five colored lights are superimposed and irradiated onto the photoreceptor, desired spectral characteristics can be accurately selected, and the characteristics can be accurately maintained. can do. Further, it does not require an intervening member such as a filter, and the structure is simple.

[Brief explanation of the drawing]

FIG. 1 is a front view of a city removal device showing an embodiment of the present invention;
Fig. 2 is a graph showing the spectral characteristics of the LED used in the example, Fig. 3 is a graph showing the spectral characteristics of other LEDs used in the example, and Fig. 4 is a graph showing the spectral characteristics of the LEDs used in the example. A diagram showing an example, FIG. 5 is a graph showing spectral characteristics of an LED according to another embodiment of the present invention, and FIG. 6 is a graph showing still another embodiment of the present invention. A side view (not shown), and FIG. 7 is a bottom curved view of the actual/l sum example. 1.1'... Photoreceptor 3G, 3R... LED (light source) Figure 4 Figure 5 Sea urchin length λp (nrn) Figure 6 Figure 7 524

Claims (3)

[Claims] (1) A static eliminator for copying that eliminates static electricity from a photoreceptor by irradiating light onto the photoreceptor has a plurality of light #s that generate light sounds of different colors to be irradiated onto the photoreceptor, and each light source A static eliminator characterized in that the light irradiation areas of the two overlap each other. (2) The static eliminator according to claim 1, wherein the ratio of the emission intensities of the respective light sources can be changed. (3) The static eliminator according to claim 1, wherein the light source is an LED.