JPS5818665A - Flash fixing device - Google Patents

Abstract

PURPOSE:To obtain a fixing device which has a very uniform flash light illuminance distribution on a recording body by installing a flash lamp on one of focal point in common and forming a reflector of consisted two elliptic bodies while forming a recording surface in the vicinity of the other focal point. CONSTITUTION:A reflector 12 consists of two elliptic bodies 12' and 12''; a flash lamp 11 is arranged at one of common focal point of both the elliptic bodies 12' and 12'', and the recording surface of a recording body 14 is close to other focal points a2 and c2. This constitution minimizes the difference between maximum illuminance IMAX and minimum illuminance IMIN on the recording surface, and then IMIN=IMAXX(0.95-0.85), thereby obtaining a fixing device which has such characteristics that the regularity of a flash light illuminance distribution on the recording body is high.

Description

[Detailed description of the invention] TECHNICAL FIELD The present invention relates to a futsusier fixing device.

Conventionally, in order to make an unfixed image such as a powder toner image formed in electrophotography or electrostatic recording into a permanent image, various heat fixing methods such as ortho/fixing, heat toll fixing, or 7-press fixing are used. The law is known.

The heat fixing method using a Tututu V&lamp is a toner image fixing method that has excellent features such as no need for preheating, no risk of the recording paper catching fire, and a simple mechanism.

Conventionally, in this 72-press heat fixing method, a method is known in which a recording paper holding a toner image is fed at a constant speed 9 while emitting flash light periodically.

Furthermore, as a device for emitting flash light, it is known that a rectangular reflecting mirror 2 with 7 flash lamps and 10 IFs is arranged so that the light illuminance distribution on the recording paper is uniform as shown in FIG. However, when this rectangular reflecting mirror is used, the light illuminance distribution on the recording paper has a maximum value directly below the lamp 1 and a minimum value around the lamp 9, as shown in Figure 2, and the minimum value is smaller than the maximum value. It will be 901 to 50 degrees.

7 with this stupid reflector? When fixing a toner image using a fixing machine, the following problems occur.

First, the degree of fixation varies depending on the size of both sides of the toner image area. This is because the 7-ray particles reflected on the non-image area of the recording paper (as a result, multiple reflections of fireflies hit the toner image area, raising the temperature of the toner and contributing to fixation, resulting in an all-over toner image). The difference in energy required for fixing between a toner image consisting only of line drawings and a toner image consisting only of line drawings becomes large.

2K) To fix the toner on the brass surface, simply
In addition to W/A, fixing will not occur unless the surface of the recording paper in contact with the toner is also raised by a certain degree, but as a result, the moisture content of the recording paper changes due to a change of 11 degrees, causing a change in the energy required for fixing. For this purpose, it is necessary to compensate for fixing when exposed to high temperature conditions with a storage medium that has toner images on all Ii (setting lm1n to 5 as shown in 2nd IQ, the opposite condition, i.e. When fixing a line-only toner image under low-temperature conditions, the supplied light energy becomes excessive, resulting in blisters on the toner image fII. There is a need for a fixing scissor device that has high uniformity in the illuminance of the 7-hole beam on the surface of the recording medium, that is, a small (Imtx-Imin) value.

SUMMARY OF THE INVENTION Accordingly, it is an object of the present invention to provide a hook placement on a recording medium.

An object of the present invention is to provide a Fussche fixing device equipped with a Fussche lamp and a reflector, in which the reflector is composed of a first ellipsoidal portion and a second ellipsoidal portion that share one focal point, respectively, and the shared focal point is By means of a seven-point fixing device, which is characterized in that a fixing device is arranged in a section, and the recording surface is set at or near the other focal point of the ellipsoidal section of t/a1 and the ellipsoidal section of #I2. can be achieved.

The present invention will be explained in more detail with reference to the drawings.

As shown in FIG. In the device that fixes the toner image on 14, the reflection! 12 consists of a combination of two ellipsoids 12' and 12'', which share the focal point V of the first ellipsoid and the ellipsoid of 11E2, and are equipped with seven ellipsoids at the shared focal point F,
Furthermore, the other focal point F'i of the first ellipsoid 12' is the effective fixing width W*(lhchotomi-c
Similarly, the other focal point V' of the second ellipsoid is placed near the point V' at one end of the second ellipsoid. It is equipped with a reflector 12 placed near the father-in-law.

According to the device of the present invention, the direct light from the lamp can be directed to any point I on the recording medium or to the straight line connecting the lamps and the point I.
The cosine coefficient of the angle θ between the recording medium and the straight line contributes to the illuminance on the medium surface, and as a result, the point b! Direct light shows the maximum illuminance value.

On the other hand, the primary reflected light from the fuselage pump 11 via the 1st reflector 12 is focused on points al and 2 on the recording medium, and therefore the primary reflected light must be twisted to the 11y lasche light irradiation width W.
40 contributes to an increase in illuminance in the surrounding area. however.

Since the Futsushi light source is a surface light source with a circular lamp tube 120, the focus of the ellipsoidal reflector 120 is continuously expanded by the deviation from the zero point y, and as a result, a continuous illuminance distribution is formed on the recording medium. And as shown in Figure 4 (III&X
- Iolmr becomes smaller, lm for IXIvlI
It was confirmed that 1n is 98chi to 851i.

Next, to explain the second embodiment, when the recording medium 24 is fed by the arc-shaped feeding device 23 as shown in FIG. Point a at both ends of the light irradiation width Ws! 1%” 1
In this case, direct light will hardly contribute. In particular, when the surface of the recording medium is arc-shaped, it is effective to focus the primary reflected light using the reflector 22, and as a result, the illuminance distribution on the recording medium surface becomes as shown in figure VG6. Become. At this time, the value of lm1n for rnax is 95~
It was confirmed that the value was 80-. In addition, in the case of the present invention,
There is no need to share the other focal point F' of the ellipsoid of 111 with the at(ax) point, and a2 and bz, (as,
) to remove and improve the dent in the illumination distribution between
It is an effective means to shift the position of point a2(as).

Therefore, by adjusting the positional relationship of F'-a2(a3)y-10m 8 degrees, the illuminance distribution can be made even more uniform. The same applies to bz and bB.

[Brief explanation of the drawing]

FIG. 1 is a schematic diagram of a conventional 7-lash light emitting device, FIG. 2 is a graph showing the light illuminance distribution by the device of FIG. 1, and FIG. 3 is a schematic diagram of an example of the flash light emitting device of the present invention. It is a cross-sectional view, and FIG. 4 is jlI! FIG. 5 is a schematic sectional view of another embodiment of the present invention, and FIG. 6 is a dart 7 showing the light illuminance distribution by the device of FIG. 5. . Codes in the figure: 1 11'=, 21---7 Lassie lamp, 12.
22--Reflector, 3, 15, 23--Recording medium feeding device, 4, 14, 24--Recording medium, 12', 22
'---#! 1 ellipsoid. 12', 22'---12 ellipsoids. Figure 11 Figure 2! Tow W・-su Figure 3

Claims (1)

[Claims] 7. In a flash fixing device equipped with a flash lamp and a reflector, the reflectors each share one focal point II.
9. Consisting of an ellipsoidal part of I and a second ellipsoidal part. A Fusscher lamp is arranged in this shared focal point, and the first
A seven-piece articulation station characterized in that the bait is at or near the other focal point of each of the ellipsoidal part and the second ellipsoidal part.