JPS6368839A - Fixing device - Google Patents

Abstract

PURPOSE:To increase a fixing speed by using a rare gas discharge lamp of a long arc type for a light source and coating a fluorescent material which generates fluorescence of 360-470nm wavelength to the reflection surface of the mirror. CONSTITUTION:The rare gas discharge lamp 2 of the long arc type is used as the light source. The discharge lamp 2 is enclosed by a mirror 1 coated with the fluorescent material which emits the fluorescence of 360-470nm wavelength. Such discharge lamp is disposed in proximity to a traveling path for recording paper and in some cases, the same kind of the fluorescent material is disposed between a discharge gas and the traveling path as well. The light of 200-1,100nm wavelength is strongly radiated from the rare gas discharge lamp 2; therefore, the fluorescent material is excited and a large quantity of the fluorescence is obtd. Since the lamp 2 permits electric input of several - several tens watt per cm of inter-electrode distance, the small, light weight and powerful fixing device is obtd. and the fixing speed is increased.

Description

[Detailed description of the invention] [Field to which the invention pertains] The present invention relates to optical fixing of recording paper in a thermal copying machine.

(Prior art and its problems) Light fixing for light fixing type thermal recording paper has already been published in
7-157770, 57-159668, Utsukai Show 60
−． 14035, Utility Model Application Publication No. 61-83931, etc., the research was introduced.

Institute of Electronics and Communication Engineers Technical Research Report EMC84-24 (1984
), heat-sensitive recording paper has a low shelf life, and improvements are required. For example, the so-called "copy" on which the treatment image is formed is heated to 70°C.
When heated, the paper surface turns black. therefore,
I would like to do some sort of treatment to the non-imaged areas of the paper to prevent them from being colored. For this reason, chemically reactive substances that contribute to coloring are photodecomposed in areas where images are not formed, and research into optical fixing devices for this purpose is active.

Conventionally, it has been pointed out that a wavelength of 360 nm to 470 nm is preferable for the emitted light in an optical fixing device. There is no optical fixing device that emits strong light. For example, a fixing device incorporating a small fluorescent lamp whose emission wavelength peaks around 420 nm is known, but the electrical input per 1 cm of the lamp's electrode distance is 1 cm.
Since it is less than watt, the total amount of light is absolutely insufficient and the fixing speed cannot be increased.

[Purpose of the invention]

The present invention was made in view of the above-mentioned circumstances, and its purpose is to
The object of the present invention is to provide an optical fixing device that powerfully emits 70 nm light, thereby increasing the fixing speed.

[Structure and operation of the invention]

In order to achieve the above object, the present invention uses a long-arc type rare gas discharge lamp as a light source, and this discharge lamp has a wavelength of 3.
The recording paper is surrounded by mirrors coated with a fluorescent substance that generates fluorescence in the range of 60 nm to 470 nm, and placed close to the running path of the recording paper. Deploy.

Since the rare gas discharge lamp emits intense light with a wavelength of 200 nm to 11100 nm, the fluorescent substance is excited and a large amount of fluorescent light is obtained. In particular, this lamp has a distance between electrodes of 1 cm.
Since an electrical input of several watts to several tens of watts per unit is possible, it becomes a small, lightweight, and powerful optical fixing device, contributing to an increase in fixing speed.

〔Example〕

FIG. 1 is an explanatory diagram of the main parts of an optical fixing device according to an embodiment of the present invention. Substances such as 5r2
PzO7:Eu or (Sr, Ca)s(PO4)3cl:
2 is a long-arc type xenon lamp, which is lit by an AC power source. Approximately 150 VA of power is supplied to a distance between the electrodes of 3 Q cm. Therefore, 5 VA per 1 cm. is.XX
is a running path of the recording paper 3, and a mirror and a discharge lamp are installed close to each other so as to irradiate about 30 Io as a distance I7 in the running direction.

The basic configuration may be as described above, but when considering the effective use of ultraviolet rays from the discharge lamp, it is important to consider the area θ on the road side that connects the edge 12 of the mirror 1 and the center 21 of the discharge lamp 2. It is preferable to arrange a biresect glass 4 coated with the same type of phosphor between the travel path XX. Pairesoku glass 4
is preferable because it transmits fluorescent light in the above wavelength range well.

Now, Figure 2 shows the spectral radiation characteristics of a long arc type xenon lamp. The excitation wavelength range of the above fluorescent substance is approximately 400
Since it is located at a wavelength of 360 nm or less, it shines well when it receives radiation from a xenon lamp, and the fluorescent light has a wavelength of approximately 360 nm to 4 nm.
The wavelength range is 70 r+m, and the peak is near 420 nm, which is far from photodecomposition of chemically reactive components in the non-image-formed area of the thermosensitive recording paper. Power consumption 150 VA (75V x
When a fixing mounting test was conducted on A4 paper using the xenon long arc lamp of 2 A), a maximum fixing speed of 15 sheets/min was obtained. On the other hand, for example, Utility Model No. 61-8393
Even if we adopt the highly improved method introduced in 1.
The fixing speed for a paper surface of size 4 requires as much as 1.5 minutes per sheet, and according to the fixing device of the present invention, a fixing speed more than 20 times faster than the conventional fixing speed can be obtained.

Other examples will also be mentioned.

From the perspective of effectively utilizing the ultraviolet rays emitted from the discharge lamps, the same type of fluorescent material was placed between the discharge lamps and the running path, but of course,
It may also be applied to the glass bulb 22 forming the discharge lamp. In addition, as a luminescent gas for a discharge lamp, if it is a rare gas, the spectral radiation characteristics are generally similar, and the wavelength is 400r+n.
Since ultraviolet rays of + or less are strongly emitted, the same effects as in the above embodiment can be obtained.

[Function and effect of the invention]

As can be understood from the description of the embodiments above, the present invention is directed to a long-arc type rare gas which can apply an electrical input of several watts to several tens of watts per 1 cm of distance between electrodes, and which instantaneously lights up and is instantaneously stable. A large amount of strong ultraviolet light with a wavelength of 400 nm or less is emitted from a discharge lamp, and the fluorescence wavelength range is 360 nm.
It excites a fluorescent substance with a wavelength of 470 nm to 470 nm, and since the fluorescent substance is coated on a mirror, high-output fluorescent light is efficiently directed to the traveling path, and as mentioned above, the fixing speed is faster than before. The fixing speed can be several tens of times faster than that of the previous one. Moreover, it satisfies the requirements of being small and lightweight.

[Brief explanation of the drawing]

FIG. 1 is an explanatory diagram of the main parts of an optical fixing device according to an embodiment of the present invention;
FIG. 2 is an explanatory diagram of the spectral radiation characteristics of a xenon lamp. In the figure, 1 is a mirror, 2 is a xenon lamp 3 is a recording paper, and 4 is a Pyrex glass.

Claims (2)

[Claims] (1) A fixing device that includes a light source placed close to the running path of the recording paper and a mirror surrounding it, the light source being a long arc rare gas discharge lamp, and the reflecting surface of the mirror having a wavelength 360nm to 47
A fixing device characterized by being coated with a fluorescent substance that generates 0 nm fluorescence. (2) Even between the rare gas and the running path, wavelengths of 360 nm to 4
A first plate comprising a fluorescent material that generates 70 nm fluorescence.
Fixing device as described in section.