JPH0441567Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Field of Industrial Application) The present invention relates to the structure of a heater for heating a fluorescent lamp of a copying machine.

(Prior Art) The brightness of the exposure fluorescent lamp used in a copying machine affects the finish of copies, so stabilizing it is the most important condition for the performance of the copying machine.

Generally, the brightness of a fluorescent lamp depends on the temperature inside the lamp tube, so the brightness at the beginning of lighting tends to be low and gradually increase. Therefore, the fluorescent lamps in copying machines are always heated to a constant temperature by some kind of heater in order to always obtain a constant brightness. Heaters conventionally used for this purpose are shown in FIGS. 6 to 9.

The fluorescent lamp heater shown in FIGS. 6 and 7 has a cord-shaped heater 1 placed between a double-sided tape 2 and an aluminum foil 3 to form a planar heater for a fluorescent lamp 4.
It is attached directly above it with double-sided tape. In addition, the heater for a fluorescent lamp shown in FIGS. 8 and 9 has a case 5 made of polyester resin and having a curved surface almost the same as that of a fluorescent lamp, and a resistance element is placed in a glass case 5 cut into a predetermined shape. A silicone rubber heater 6 is attached, which is set between two thin sheets of silicone rubber reinforced with fibers and vulcanized, and is attached to the fluorescent lamp using several links 7. .

(Problems to be Solved by the Invention) Conventionally, a heater for a fluorescent lamp consisting of a cord-shaped heater 1 used for heating a fluorescent lamp 4 used in a copying machine has a mating surface with a thin and long fluorescent lamp 4. It requires skill to accurately adhere the lamp parallel to the fluorescent lamp 4 and at a predetermined position, and if the adhesive is defective, air pockets are likely to form between the lamp 4 and the fluorescent lamp 4, resulting in variations in the light output angle and heat conduction of the heater. This often results in variations in the amount of light. Furthermore, even if a heater with poor adhesion is attempted to be removed and reused, it is difficult to reuse it due to the destruction of the adhesive surface.Therefore, there is a need for measures to improve the workability of attaching the heater to the fluorescent lamp 4.

Moreover, the cord-shaped heater 1 is wired in a meandering manner on the double-sided tape 2, and a temperature difference is generated between the part where the cord-shaped heater directly contacts and the part between them, and the whole surface is heated uniformly in a short time. It is difficult to achieve this, and it takes a considerable amount of time to raise the temperature between the heaters to a certain level.

Further, there is a drawback that the adhesive of the double-sided tape 2 for fixing the heater changes color due to fluorescent light, resulting in a decrease in brightness, or decomposes, producing harmful gases.

On the other hand, in the fluorescent lamp heater made of the silicone rubber heater 6, floating occurs when electricity is applied due to the elasticity of the silicone rubber. That is, the heater is not brought into close contact with the fluorescent lamp, causing variations in temperature distribution on the surface of the fluorescent lamp, and making the amount of light unstable. Furthermore, accessories such as the case 5 and the link 7 are required to attach the silicone rubber heater to the fluorescent lamp 4, resulting in a high product cost.

This idea was made in view of the current situation,
The purpose of this is to stabilize the light output angle and light intensity, improve workability when attaching to fluorescent lamps, and
The purpose of the present invention is to provide a fluorescent lamp heater that shortens the start-up time, has excellent safety, and is economical.

(Means for Solving the Problems) In the fluorescent lamp heater of the present invention, a film heater 11 made of a film 8 coated with conductive paint is provided with a transparent portion 12 having an arbitrary width from one longitudinal end to the other end. , which has a structure in which the film heater is formed into a cylindrical shape.

An example of the fluorescent lamp heater of the present invention will be described in detail with reference to FIGS. 1 to 5. The heater for a fluorescent lamp of the present invention includes a heat-generating portion 9 made of a transparent polyester film 8 coated with a conductive paint, for example, and a transparent polyester film 8 that is not coated with a conductive paint from one longitudinal end to the other end of the polyester film 8. The portion 12 and the tape-shaped electrodes 10 provided at both ends in the longitudinal direction are laminated with a polyester film 8' to form a polyester film heater 11 , and the polyester film heater 11 is heated and molded into a cylindrical shape. This is a heater for fluorescent lights. By making the inner diameter of the fluorescent lamp heater of the present invention smaller than the outer diameter of the fluorescent lamp used in the vertical cross section, it can be closely attached to the fluorescent lamp.

Note that the transparent portion 12 may be formed by punching.

(Operations and Examples) Since the cylindrical film of the fluorescent lamp heater of the present invention has elasticity, it can be expanded to a diameter larger than that of a fluorescent lamp, and simply insert the fluorescent lamp into it. It can be easily installed without using adhesive.

In addition, the elasticity of the film, that is, the heater, works inward, and the heat generating part can be brought into close contact with the curved surface of the fluorescent lamp through the film.
The temperature distribution in each part is uniform, and there is no loosening, gap, or misalignment caused by energization, and since the thermal conductivity is good, it is possible to heat with a low capacity, and the rise time is also fast. .

As an example of the present invention, when the fluorescent lamp heater of the present invention having an inner diameter of φ8 mm was attached to a fluorescent lamp 4 having an outer diameter of φ9 mm and the heater was energized, the capacity was increased.
Despite being as low as 20W, it quickly rose to 40°C in just 30 seconds, and measurements of the temperature at two locations on the transparent part showed a stable temperature distribution of 40±2°C. Furthermore, there were no problems such as loosening, gaps, or misalignment due to energization, and no generation of harmful gases.

(Effects of the invention) The heater for fluorescent lamps of the present invention has an elastic polyester film formed in a cylindrical shape, so it is extremely easy to attach to the fluorescent lamp and can be accurately attached to a predetermined position. If a malfunction or heat generation problem occurs, it can be easily replaced with a non-defective product, greatly improving work efficiency.

In addition, since a transparent part is provided on the polyester film heater, the light emission angle is always constant, and the heat generating part of the polyester film heater has a large effective heat generating area, so that it uniformly heats the surface of the fluorescent lamp. Fluorescent lamps have a stable light intensity, have a faster rise time than cord heaters, and are economical as they can heat with a capacity approximately 10W lower than conventional products.

Furthermore, since the fluorescent lamp heater of the present invention does not use adhesive, it does not generate harmful gases and can be used with peace of mind.

[Brief explanation of the drawing]

1 to 5 are diagrams showing an example of the present invention. Fig. 1 is a perspective view of the heater of the present invention, Fig. 2 is a plan view of the heater of the invention before heat forming, Fig. 3 is an exploded explanatory view of the A-A cross section of Fig. 2, and Fig. 4 is the main Fig. 5 is a cross-sectional view taken along line B-B in Fig. 4, and Fig. 6 is a diagram of a conventional fluorescent lamp heater made of a cord-shaped heater installed in a fluorescent lamp. FIG. 7 is a cross-sectional view taken along the line C-C in FIG. 6, and FIG. 8 is a view of a conventional fluorescent lamp heater made of a silicone rubber heater attached to a fluorescent lamp.
FIG. 9 is a sectional view taken along line DD in FIG. 8. 1...Cord heater, 2...Double-sided tape, 3
...Aluminum foil, 4...Fluorescent lamp, 5...Case, 6
...Silicone rubber heater, 7...Link,
8, 8'...Film, 9...Heating part, 10...
Electrode, 11 ...Film heater, 12...Transparent part.

Claims (1)

[Scope of utility model registration request] In the heater for a fluorescent lamp, the film heater is formed by applying a conductive paint on a film, and a transparent part is provided with an arbitrary width from one longitudinal end to the other end, and the film heater is formed into a cylindrical shape. A heater for a fluorescent lamp, characterized in that an inner diameter of the heater for a lamp is formed smaller than an outer diameter of a fluorescent lamp to which the heater for a fluorescent lamp is attached.