JPH0743940Y2 - Heater lamp and heat fixing device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial application] The present invention relates to a heater lamp as a heat radiation source used for fixing toner in a copying machine, a laser printer or the like, and a heat fixing device incorporating the heater lamp. .

[Conventional technology]

In a copying machine or the like, as a method of thermally fixing the toner by using a halogen heater lamp, conventionally, a heat roller formed by inserting a heater lamp in a roller and a contact roller arranged in contact with the heat roller are conventionally arranged. A pressure heating roller system that heats the toner under pressure to fix it on the paper to be fixed by passing it through the paper to which the toner has been transferred, and the fixed light to which the radiation from the heater lamp has been transferred. A radiant heat fixing system is known in which the toner is fixed on the paper to be fixed by directly irradiating the paper with the radiant heat.

The above-mentioned pressure heating roller system is often used for a medium-sized machine or a small machine because the apparatus can be made compact. On the other hand, the above-mentioned radiant heat fixing method has a short waiting time and is capable of high-speed fixing, so that it is often used in large machines for business establishments.

[Problems to be solved by the device]

However, recently, with the spread of small laser printers and the like, there is a strong demand for a compact and inexpensive thermal fixing device used for this, and further, low power consumption, quick start-up, and faster fixing What can be done is required.

However, in the above-mentioned pressure heating roller method, it takes a long time to heat the heat roller to a temperature at which the toner can be fixed, so that it is difficult to sufficiently meet the above-mentioned requirement for high-speed fixing. Is.

Further, in the above radiant heat fixing method, the far infrared rays emitted from the heater lamp effectively contributes to the fixing of the toner, but in the conventional heater lamp, since the far infrared ray emission efficiency is still low, a heater lamp with large power consumption is used. There was no choice but to use it, which caused an increase in running costs.

Therefore, a first object of the present invention is to provide a heater lamp that can increase the radiation efficiency of far infrared rays with a simple structure.

A second object of the present invention is to provide a heat fixing device having a compact structure, a short waiting time, and a high speed fixing.

[Means for Solving the Problems]

In order to achieve the above object, the heater lamp of the present invention has a filament coil disposed along the axis of a glass tube bulb, and a dark ceramic coating film on one surface extending in the longitudinal direction of the tube bulb. (Hereinafter, abbreviated as "dark ceramic film") is provided, and a light-colored ceramic coating film (hereinafter abbreviated as "bright ceramic film") is provided on the other surface of the tubular valve that faces the one surface. It is characterized by

Further, in the heat fixing device of the present invention, the heater lamp is arranged so that one surface provided with a dark ceramic film faces the side of the fixing paper on which toner is transferred, and the other surface provided with a light ceramic film. It is characterized by arranging a gutter-shaped mirror on.

[Action]

In the heater lamp, the light traveling from the filament coil to the other surface provided with the light-colored ceramic film is diffusely reflected by the light-colored ceramic film having high light reflectivity, and the dark-colored ceramic film provided on the one surface facing the other surface. Head to.
Since this dark-colored ceramic film has high light absorption, the irregular reflection light is efficiently absorbed and heated. Therefore, the temperature of the dark-colored ceramic film rises rapidly, and the temperature reached by the dark-colored ceramic film becomes sufficiently high, so that the amount of far infrared rays radiated from the dark-colored ceramic film to the outside of the tubular bulb significantly increases.

Further, in the heat fixing device incorporating the heater lamp described above, far infrared rays are radiated from the dark ceramic film to the fixing paper on which the toner is efficiently transferred, and the gutter-shaped mirror arranged on the light ceramic film side. The far infrared rays emitted from the light-colored ceramic film to the outside are also reflected by the toner and the paper to be fixed, so that the thermal efficiency is remarkably improved. Therefore, the waiting time is short and sufficient high-speed fixing can be achieved. Further, since the gutter-shaped mirror can be arranged close to the heater lamp, the device can be made compact.

〔Example〕

 Hereinafter, embodiments of the present invention will be described with reference to the drawings.

FIG. 1 (A) is a perspective view of a heater lamp according to an embodiment of the present invention, and FIG. 1 (B) is a vertical sectional view of the heater lamp. 11 is a glass tube type valve, 12 is a seal part, 2 is a filament coil, 21 is a ring anchor, 22 is an inner lead, 23 is a metal foil, 24 is an outer lead, 3 is a dark ceramic film, 4 is a light ceramic film. Is.

The filament coil 2 is arranged along the axis of the tubular bulb 11.

A dark-colored ceramic film 3 is provided on one surface of the tube-shaped bulb 11 extending in the longitudinal direction in a substantially half circumference. The dark ceramic film 3 has a high light absorption property because it is a dark color. Therefore, the dark ceramic film 3 efficiently absorbs light and rises to a sufficiently high temperature, whereby far infrared rays are efficiently radiated to the outside of the tubular bulb 11.

A light-colored ceramic film 4 is provided on the other surface of the remaining approximately half circumference facing the one surface of the tubular valve 11. Since the light-colored ceramic film 4 has a light color, the light-reflectance is high, and the reflected light becomes irregularly reflected light. Therefore, the light escaping from the filament coil 2 to the side opposite to the dark-colored ceramic film 3 is transmitted to the filament coil 2. It is possible to efficiently concentrate the light on the dark ceramic film 3 without moving it backward.

The means for forming the dark-colored ceramic film 3 and the light-colored ceramic film 4 is not particularly limited, but a means for spraying a coating liquid containing a ceramic material onto the surface of the tubular valve 11 is preferable. According to this spray coating, the process is simple and the manufacturing cost can be reduced. In addition, the spray coating is performed from one direction of the tubular valve 11 to form the light-colored ceramic film 4, and then the tubular valve 11 is half-turned to perform spray coating from the one direction to form the dark-colored ceramic film 3. For example, the dark-colored ceramic film 3 is formed on almost the half surface of the tubular bulb 11, and the light-colored ceramic film 4 is formed on the remaining almost half surface.

As the ceramic material forming the dark-colored ceramic film 3 and the light-colored ceramic film 4, for example, an ordinary alumina-based or silica-based ceramic material can be used.
When the dark ceramic film 3 is formed, a black pigment such as copper chromate may be added to the ceramic material.

According to the heater lamp of this embodiment, the light traveling from the filament coil 2 to the light-colored ceramic film 4 is diffusely reflected by the light-colored ceramic film 4 and is efficiently concentrated on the dark-colored ceramic film 3 side. Is heated to a sufficiently high temperature, and the amount of far infrared rays emitted from the dark-colored ceramic film 3 to the outside of the tubular bulb 11 is significantly increased. Further, since the dark ceramic film 3 is rapidly heated, the time from the start of lighting until the predetermined amount of radiated light is obtained is considerably shortened.

Actually, based on the configuration shown in Fig. 1, power consumption 450W
A heater lamp according to the present invention having a lamp voltage of 100 V was manufactured and a lighting test was conducted. As a result, the rise time of the temperature of the tubular bulb was 1 minute and the fall time was 2 minutes 45 seconds. On the other hand, the same test was performed on the comparative heater lamp manufactured in the same manner as above except that the dark ceramic film was not provided. The rise time was long at 1 minute 20 seconds and the rise time was long at 3 minutes 20 seconds. , Was clearly inferior to the heater lamp according to the present invention. here,
"Rise time" means that after the heater lamp is turned on, the tube wall temperature of the tubular valve is 10% of its maximum value to 90% of its maximum value.
It means the time until the temperature rises to. The "fall time" is the time from when the heater lamp is turned off until the tube wall temperature of the tubular valve returns from 90% of its maximum value to 10% of its maximum value.

FIG. 2 is a schematic view of a heat fixing device according to an embodiment of the present invention. Reference numeral 1 is a heater lamp, 3 is a dark ceramic film, 4 is a light ceramic film, 5 is a gutter-shaped mirror, 6 is paper to be fixed, and 61 is toner.

The heater lamp 1 has the same configuration as that shown in FIG. 1, and is arranged such that one surface of the heater lamp 1 on which the dark ceramic film 3 is provided faces the fixed paper 6 side to which the toner 61 is transferred.

On the other surface side where the light-colored ceramic film 4 is provided, a gutter mirror 5 is arranged so as to surround the other surface.

According to this heat fixing device, both the far infrared rays emitted from the dark ceramic film 3 of the heater lamp 1 and the far infrared rays reflected from the gutter-shaped mirror 5 are provided on the paper 6 to which the toner 61 is transferred. It is irradiated efficiently. Therefore, the thermal efficiency becomes sufficiently high, and the fixing of the toner can be achieved at a high speed. Further, since the gutter-shaped mirror 5 can be arranged close to the heater lamp 1, the device can be sufficiently downsized.

Since the far-infrared radiation efficiency of the heater lamp 1 is remarkably high, if the power consumption is kept constant, the far-infrared radiation amount can be increased more than that of the conventional heater lamp, and conversely. If the amount of infrared radiation is constant, it becomes possible to radiate a predetermined amount of far infrared with less power consumption than the conventional heater lamp.

[Effect of device]

As described above, according to the heater lamp of the present invention,
With a simple structure, the amount of far infrared rays emitted from the dark ceramic film can be increased.

Further, according to the thermal fixing device of the present invention, it is possible to achieve the fixing of toner at a high speed with a compact structure, a short waiting time.

[Brief description of drawings]

FIG. 1 (A) is a perspective view of a heater lamp according to an embodiment of the present invention, FIG. 1 (B) is a sectional view of the heater lamp, and FIG.
FIG. 1 is a sectional view of a heat fixing device according to an embodiment of the present invention. 1 …… Heater lamp, 11 …… Tube type bulb 12 …… Seal part, 2 …… Filament coil 21 …… Ring anchor, 22 …… Internal lead 23 …… Metal foil, 24 …… External lead 3 …… Black ceramic Film: 4 ... White ceramic film 5: Gutter mirror, 6: Fixed paper 61: Toner

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁶ Identification code Internal reference number FI technical display area H05B 3/44 7512-3K

Claims (2)

[Scope of utility model registration request] 1. A glass tube-type bulb, wherein a filament coil is arranged along an axis of the tube-type bulb, and a dark ceramic coating film is provided on one surface extending in the longitudinal direction of the tube-type bulb. A heater lamp characterized in that a light-colored ceramic coating film is provided on the other surface facing one surface. 2. The heater lamp according to claim 1, wherein the one surface provided with the dark ceramic coating film is arranged to face the fixing paper side to which the toner has been transferred, and the light ceramic coating film is provided. A thermal fixing device characterized in that a gutter-shaped mirror is arranged on the other surface side provided.