JPH083962Y2 - Thermal fixing device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to a heat fixing device of a radiant heat fixing system used for fixing toner in a copying machine, a laser printer, or the like.

[Conventional technology]

In copiers and the like, as a method of thermally fixing toner using a halogen heater lamp, conventionally, between a heat roller configured by inserting and arranging a heater lamp in a roller and a contact roller disposed in contact with the heat roller. A pressurized heat roller method of heating the toner under pressure and fixing it on the paper by passing the paper through which the toner is transferred;
There is known a radiant heat fixing method in which a radiation light from a heater lamp is directly radiated to a fixing paper on which the toner is transferred, and the radiant heat is used to fix the toner on the fixing paper.

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

[Problems to be solved by the invention] However, with the recent widespread use 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. There is a demand for a quick start-up and faster fixing.

However, in the above-mentioned pressure heating roller system, it takes a long time to heat the heat roller to a temperature at which the toner can be fixed. 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, an 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 problem]

In order to achieve the above object, the heat fixing device of the present invention has a filament coil disposed along the axis of a glass tube bulb, and a dark ceramic coating on one surface extending in the longitudinal direction of the tube bulb. A heater lamp provided with a film (hereinafter abbreviated as “dark ceramic film”) and having a metal reflection surface on the other surface facing the one surface of the tubular bulb is used as a heater lamp. It is characterized in that it is arranged so as to face the transferred fixing paper side.

[Action]

In the heater lamp, light traveling from the filament coil to the other surface on which the metal reflecting surface is formed is efficiently reflected by the metal reflecting surface. Therefore, light is concentrated on the dark-colored ceramic film provided on one surface facing the other surface. Moreover, since this dark-colored ceramic film is a "dark-colored system", it is possible to absorb the light from the filament coil with a significantly higher absorption standing than the ordinary ceramic film,
The light is efficiently absorbed and heats the dark ceramic film. As a result, the temperature of the dark-colored ceramic film rises rapidly, and the temperature reached by the dark-colored ceramic film becomes sufficiently high, and the amount of far-infrared rays emitted from the dark-colored ceramic film to the outside of the tubular bulb significantly increases.

As a result, in the thermal fixing device of the present invention incorporating the above heater lamp, far infrared rays are efficiently irradiated from the dark ceramic film to the toner and the paper to be fixed,
The thermal efficiency is significantly improved. Therefore, the waiting time is short and sufficient high-speed fixing can be achieved. Further, since the metal reflecting surface also functions as a reflecting mirror, there is no need for a reflecting mirror separate from the heater lamp, and the apparatus can be sufficiently made compact.

Embodiments Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 (A) is a perspective view of a heater lamp used in an embodiment of the present invention, and FIG. 1 (B) is a sectional view of the heater lamp. 11 is a tubular valve, 12 is a seal part, 2 is a filament coil, 21 is a ring anchor, 22 is an internal lead, and 23.
Is a metal foil, 24 is an external lead, 3 is a dark ceramic film, 4
Is a metal reflective surface.

The filament coil 2 is disposed along an axis in the tubular valve 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 means for forming the dark-colored ceramic film 3 is not particularly limited, but a coating solution prepared by adding a black pigment such as copper chromate to an alumina-based or silica-based ceramic material is sprayed onto the tubular valve 11. Means of spraying on the surface are preferred. According to this spray coating, the process is simple and the manufacturing cost can be reduced. Further, by performing spray coating from one direction of the tubular valve 11, the dark ceramic film 3 can be formed on almost half the surface of the tubular valve 11.

The dark ceramic film 3 has a characteristic of absorbing light from the filament coil (light having a peak wavelength in the near-infrared region) at a much higher absorption rate than a normal ceramic film because it is a dark color. Therefore, the dark ceramic film 3 efficiently absorbs the light from the filament coil and rises to a sufficiently high temperature in an extremely short time, and far infrared rays are efficiently radiated to the outside of the tubular bulb 11.

A metal reflecting surface 4 is provided on the other surface of the remaining approximately half circumference facing the one surface of the tubular bulb 11. The metal reflecting surface 4 has a high light reflectivity and concentrates the light escaping from the filament coil 2 to the side opposite to the dark ceramic film 3 to the dark ceramic film 3. The means for forming the metal reflecting surface 4 is not particularly limited, but it can be formed by a vapor deposition film of a metal such as ammonium or gold.

According to the heater lamp used in this embodiment, since the light traveling from the filament coil 2 to the metal reflecting surface 4 is reflected by the metal reflecting surface 4 and concentrated on the dark ceramic film 3 side, the dark ceramic film 3 is sufficiently formed. When heated to a very high temperature, 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. Also,
Since the dark ceramic film 3 is rapidly heated, the time from the start of lighting until the predetermined amount of emitted light is obtained is considerably shortened.

FIG. 2 is a schematic view of the heat fixing device according to the embodiment of the present invention. Reference numeral 1 is a heater lamp, 3 is a dark ceramic film, 4 is a metal reflection surface, 5 is fixing paper, and 51 is toner.

The heater lamp 1 has the same structure 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 toward the fixed paper 5 side to which the toner 51 is transferred.

According to this thermal fixing device, the fixing paper 5 carrying the toner 51 is efficiently irradiated with far infrared rays from the dark ceramic film 3 of the heater lamp 1. Therefore, the thermal efficiency becomes sufficiently high, and the fixing of the toner can be achieved at a high speed. Further, since the metal reflecting surface 4 functions as a reflecting mirror, a reflecting mirror separate from the heater lamp 1 becomes unnecessary,
The device can be made sufficiently compact.

Since the radiation efficiency of far-infrared rays by the heater lamp 1 is remarkably higher, the radiation amount of far-infrared rays can be increased as compared with the conventional heater lamp if the power consumption is fixed. If the amount of infrared radiation is constant,
It is possible to emit a predetermined amount of far-infrared rays with less power consumption than a conventional heater lamp.

[Effect of device]

As described above, according to the heat fixing device of the present invention,
In the heater lamp that constitutes this, it is possible to further shorten the rise time from the start of lighting to the emission of a predetermined amount of far-infrared rays, because the dark ceramic film is rapidly heated, and the dark color Since the amount of far infrared rays emitted from the ceramic film can be increased, the toner can be fixed with a compact structure, a short waiting time, and a high speed.

[Brief description of drawings]

FIG. 1 (A) is a perspective view of a heater lamp used in an embodiment of the present invention, and FIG. 1 (B) is a sectional view of the heater lamp.
FIG. 2 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 ... Metal reflective surface 5 ... Fixed paper, 51 ... 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 (1)

[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 heat-fixing device, characterized in that a heater lamp having a metal reflecting surface formed on the other surface opposite to the one surface is arranged so that the one surface of the tubular bulb faces the side of the fixing paper on which the toner is transferred. .