JPS58115455A - Imaging device - Google Patents

Abstract

PURPOSE:To correct a drop of light quantity in the end part, and to get rid of an uneven light intensity distribution, by using a gas discharge tube of high luminance and low power, holding it at a constant temperature, and increasing the intensity of a light source by a magnetic field. CONSTITUTION:A titled device is provided with a temperature detecting element 45 for controlling a fluorescent lamp at a constant temperature, a fluorescent lamp heating device 44 and a temperature controlling circuit 45. When a temperature in a fluorescent lamp housing 46 has been set to 40-50 deg.C by this temperature controller, the highest luminance having a distribution of a balanced time can be obtained. In order to eliminate a luminance distribution in this balanced time, a samarium cobalt magnet 41 is installed to a luminance drop part 47, and a magnetic field of 600 gauss falling at right angles with length of a fluorescent tube is applied. As a result, a uniform luminance distribution curve whose uneven luminance is <=5% can be obtained. As for the magnet, a ferrite magnet, etc. are available, and in an optional fluorescent body other than an aluminate fluorescent material, and an optional discharge tube (a mercury lamp and a sodium lamp) are effective as well.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a printing device applying xerographic technology, and more particularly to a light source for a copying machine or an optical printer.

The purpose of the present invention is to:
It is possible to obtain a high-brightness, flat light source with no unevenness in the amount of light.

In copying machines, halogen lamps are widely used as high output light sources. However, 10-gen lamps consume a lot of power and are expensive, so they are being replaced by aperture-type wall lamps that are inexpensive and provide high light output. FIG. 1 shows an aperture-type wall light as an example of a high-brightness vertical wall light. This fluorescent light has a reflective layer 15 and a phosphor layer 14 in a fluorescent tube 1.1. The transparent aperture window makes it possible to obtain high, directional light energy, and the use of a phosphor having an emission spectrum that is equal to the spectral sensitivity of the photosensitive drum (f%) makes it an excellent light source. However, this fluorescent lamp has % in the length direction of the fluorescent lamp.
For example, if the light intensity distribution is as shown in FIG. 2, and the length is 5, the luminance decreases by 2G-50% at a distance of 10 am from the center compared to the center. Although it is common practice to use optical slits to make the light intensity distribution uniform, this method has the disadvantage that the light energy for forming iir* is reduced and the process speed is slowed down. For this reason, it is desirable to increase the amount of light at the periphery relative to the amount of light at the center.

The present invention responds to such demands, and the operating principle of the light source according to the present invention is shown in the 111th section.

One magnetic field s4 is applied to the filament electrode of the aperture cover wall light 11 having the transparent window 12 where the AIK AC voltage is applied and the lighting operation is performed. When there is no magnetic field, the charged particles 52 in the fluorescent tube are accelerated by an alternating current electric field, and after the mean-freedom ILL travel, they become neutral particles or charged particles 5 of opposite polarity.
6 and generates ultraviolet and violet rays. In a fluorescent lamp, -E ultraviolet or visible light excites the phosphor with high efficiency, producing high-brightness abdominal wall color light.

On the other hand, when a magnetic field is applied, in addition to the force due to the alternating current electric field, a new force due to the AI field 54 is applied. (
Figure 5B) When a magnetic field is applied in a direction perpendicular to the alternating current electric field, it moves along a trajectory as shown. Compared to the distance traveled per unit time when there is no magnetic field, this motion increases the distance traveled when a magnetic field is present, and as a result, the probability of collision per unit time increases. As a result, brightness can be improved as the amount of violet and external rays emitted increases.

Detailed embodiments according to the present invention will be described below.

Practical Example 1 Figure 4 shows the configuration of the uniform-luminance-intensity-distributed fluorescent lamp according to the present invention. Figure 5 shows an aluminate phosphor with a tube length of 65 mm and an aperture width of 4 mm used here. This figure shows one example of the brightness distribution characteristics of warning lights.

As a result, it can be seen that even at the equilibrium state 52, there is a 25% unevenness in the amount of light with respect to the effective width required for the four sheets of paper.

Further, when the brightness distribution is not balanced 51 due to fluctuations in the mercury vapor pressure within the fluorescent tube due to environmental temperature fluctuations, even more unevenness in the amount of light occurs.

For this reason, it is necessary to eliminate fluctuations in the brightness distribution corresponding to fluctuations in environmental conditions, and for this purpose, a temperature detection element 4s and a warning light heating device 4 are used to control the warning light to a constant temperature.
4 and a temperature control circuit 45. In such a temperature control device, if the internal temperature of the warning light frame 46 is set to 40 to 50° C., the maximum brightness having the above-mentioned equilibrium distribution can be obtained. In order to eliminate this brightness distribution at the time of equilibrium, a samarium cobalt magnet 41 is installed in the one brightness reduction section 47, and a magnetic field of 600 Gauss perpendicular to the length of the fluorescent tube is applied.

As a result, a uniform brightness distribution curve 55 with a brightness unevenness of S- or less can be obtained. In the present invention, the above-mentioned Namarium-Cobalt magnet has been described as an example, but other magnets such as ferrite magnets can also be applied, and furthermore, it can be used as a warning light. Any phosphor other than the aluminate phosphor and any discharge tube other than the warning light (mercury lamp-sodium lamp, etc.) are also effective.

Embodiment 2 FIG. 4 shows an optical printer according to the present invention, which comprises the above-mentioned fluorescent light source 61, high-speed response liquid crystal micro-shutter array 62, convergent optical fiber lens array 6, photoreceptor 64, optical device 65, and fixing device 66. A tube length of 550゛ and a tube diameter of 25■φ has a temperature control device and a brightness correction magnet 68 as shown in FIG.
A warning light with an emission wavelength of 550 cm and an aperture width of 4 cm, which is made of an arusunate phosphor, is lit with a high dove wave current of 18 amperes, and a light of 100 ha is placed at a distance of 10 cm from the warning light. 1G electrically switchable micro apertures/■
It consists of a high-speed liquid crystal shutter array 62 with a writing width of 20 m + writing width at a density of , the liquid micro-aperture image is formed as an electrostatic latent image on the photoreceptor 64 by the action of the convergent optical fiber lens array in response to a control signal of the liquid crystal shutter. This electrostatic latent image is transferred onto A4 size paper 1 using a transfer device 67 using a magnetic toner and a transfer device 67 using a positive corona.
By applying heat or pressure, the desired precipitate can be obtained. With light 11 without a brightness correction magnetic field, print density unevenness in the peripheral area is noticeable at a writing speed of 5 sheets per minute, whereas print density unevenness in the peripheral area using a brightness correction magnet is noticeable. The printing speed was improved by 20%.

As described above, the present invention uses a high-intensity, low-power gas discharge tube as a light source for a printing device, and uses a magnetic field to increase the light source intensity in order to compensate for a decrease in the amount of light at the end of the light emitting part. In order to eliminate unevenness in the light intensity distribution caused by fluctuations in the light intensity, the light source is kept at a defined i1 degree. As a result, by realizing a light source with a high output and uniform energy distribution, it is possible to eliminate the uneven egg weight density of the conventional printing apparatus and to achieve a fast response.

[Brief explanation of the drawing]

FIG. 1 shows the appearance and cross-sectional structure of a warning light used in the present invention. 11...Fluorescent tube 12...Aperture transparent window 15...-Reflection layer 14-...Fluorescent layer Figure 2 shows the tube length of the above warning light. Shows the light intensity distribution with respect to direction. FIG. 5 shows the principle of operation of the invention. Symbol K indicates the operating principle in the absence of a magnetic field, and B indicates the operating principle in the presence of a magnetic field. 5.1 - Filament 52 - Monokinetic charged particles 55 - Neutral or opposite polarity particles 54 - Magnetic field FIG. 4 shows the construction of a fluorescent light source according to the invention. 41...-Magnet 42...High pigeon wave electrode 45--Ii & detection element 44--Heating device 45--Temperature control circuit 46--Sensitive source frame 47... . . . Luminance Reduction Section FIG. 5 shows the luminance distribution characteristics of the warning light. 51 ...--Unstable asymmetric brightness distribution in non-equilibrium 52
. . . Brightness distribution at equilibrium (5) Brightness distribution after brightness correction according to the present invention FIG. 6 shows the configuration of the optical printer according to the present invention. 61・-1・Warning light 62・・・LCD micro shutter array 65・
...Accurate optical fin (-lens array 64...
... Photosensitive drum 65 ... IA connection device 66 ... Fixed attachment device 67 ... Transfer device 6B ... Magnet. The above applicant is Kiriwa Seikosha Co., Ltd. Representative Patent Attorney Tsumugi Mogami A/a'. Figure 1 Figure 2) β ≦ Figure 3 Figure 4 2 Figure 6

Claims (1)

[Scope of Claims] 1) A printing apparatus having a xerography process, comprising an illumination light source for the armpit xerography process, the armpit illumination light source comprising a gas discharge tube and a magnetic field generating device, 2) The above-mentioned illumination light source has an aperture, a fluorescent lamp, a magnetic field generator, and a wrinkle illumination light source. A printing apparatus according to item 1 of the patent-requested scope characterized in that it comprises a constant temperature device that maintains the temperature at a constant temperature S) A printing apparatus characterized in that it has a liquid crystal microphone i-shutter, a converging optical fiber lens array, and a photoreceptor. Imprint holder set forth in claim 2