JPH0551157B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a hollow tubular heater, which is used as a heat-retaining heater for an exposure light source in, for example, an electrophotographic copying machine, a facsimile machine, a microfilm reader printer, etc. In particular, the present invention relates to a hollow tubular heater that can be easily attached to and detached from, for example, a fluorescent lamp used in an electrophotographic copying machine and that can make temperature distribution uniform.

Halogen lamps and fluorescent lamps are usually used as exposure light sources for electrophotographic copying machines, facsimile machines, microfilm reader printers, etc., but the emission state of these exposure light sources depends on the temperature of the light source at the time of input. (Usually 40~ for fluorescent lights
The most stable temperature is when the temperature (43°C) is kept constant. For this reason, this light source is usually equipped with a heat-retaining heater on the outer circumferential surface of the light source, except for the part that emits light from the exposure light source. Since the temperature was around 30°F, it was necessary to use heat-resistant insulating material for the exterior.

(Prior Art) A conventional technology of a hollow tubular heater used as a heat-retaining heater for an exposure light source in, for example, an electrophotographic copying machine, a facsimile machine, a microfilm reader printer, etc. will be specifically described below with reference to the drawings.

FIGS. 4 to 7 are diagrams for explaining an example of a conventional hollow tubular heater. FIG. 4 is a diagram showing a conventional aluminum foil heater attached to an exposure light source, and FIGS. 5 a and b 6 is a diagram showing details of a conventional aluminum foil heater, FIG. 6 is a diagram showing details of a part A (connection part) of a conventional example, and FIG. 7 is a diagram showing details of a heater wire of a conventional example. Note that FIG. 5a is a plan view, and FIG. 5b is a sectional view taken in the X and X1 directions shown in FIG. 5a.

In these figures, 21 is an aluminum foil heater,
22 is a light source for exposure, and the illustrated example is a fluorescent lamp. 23 is a lead wire, 24 is a housing for connecting to an external circuit, 25 is an aluminum foil, 26 is a heater wire, and 27 is an adhesive for attaching the aluminum foil 25 and the heater wire 26. It is made of liquid silicone rubber. 2
8 is an insulating tube made of, for example, silicone rubber; 29 is a connector for connecting the heater wire 26 and the lead wire 23; 30 is a glass core made of, for example, glass fiber; 31 is a resistance wire made of, for example, a nickel-chromium alloy; For example, it is an insulator made of silicone rubber.

Note that here, the heater wire 26 is connected to the glass core 3.
0, a resistance wire 31 and an insulator 32. The insulating tube 28 and the connector 29 are usually fixed using thermosetting liquid silicone rubber (ordinary curing type may also be used). A temperature sensor (not shown), such as a thermistor, is typically incorporated within the aluminum foil heater 21.

The conventional hollow tubular heater described above is shown in FIGS. 4 and 5.
As shown in Figures a and b, the aluminum foil heater 21 has a heater wire 26 appropriately matched to the rated heat amount, rated current, etc. arranged on one side of the aluminum foil 25 in a predetermined shape, and the aluminum foil 25 and the heater wire 26 are bonded together. This aluminum foil heater 2
1 was fixed to the exposure light source 22 using an adhesive made of, for example, a thermosetting liquid silicone rubber (or a room temperature curing type).

Next, regarding a hollow tubular heater that can be easily attached to and detached from the exposure light source 22, for example,
It is described in Publication No. 41646. Hereinafter, a detailed explanation will be given using the drawings.

8 and 9 are diagrams for explaining another example of the conventional hollow tubular heater, FIG. 8 is a perspective view showing the structure of the conventional example, and FIG. 9 is a sectional view showing the structure of the conventional example. be.

In these figures, 41 is a heating element, 42 is a lead wire, 43 is a cured insulating elastomer layer formed inside the heating element 41, 44 is a cured insulating elastomer layer formed outside the heating element, and 45 is a reinforcing material. This is a reinforcing layer made of film, woven fabric, or non-woven fabric that is provided as needed.

The uncured insulating elastomer that becomes the cured insulating elastomer layers 43 and 44 may be, for example, a compound or liquid silicone obtained by adding a curing agent, a flame retardant, a filler, etc. to silicone rubber, fluorocarbon rubber, etc. and kneading the mixture uniformly. Rubber etc. are used. The heating element 41 is composed of, for example, a ribbon-shaped metal foil, conductive rubber, a resistance wire, or a resistance wire wound around a glass core.

Next, a method for manufacturing this hollow tubular heater will be explained.

First, the uncured insulating elastomer that will become the cured insulating elastomer layer 44 is separated, and then the heating element 41 is provided on top of this, and then the uncured insulating elastomer that is dispensed on top of this becomes the cured insulating elastomer layer 43. An insulating elastomer is provided. Of course, the order of dispensing each uncured insulating elastomer may be reversed.

The thus-produced laminate is then adjusted to a predetermined diameter so that a hollow tubular heater of the required diameter is obtained by placing the uncured insulating elastomer that will become the cured insulating elastomer layer 43 on the inside. The laminate is covered with a cylindrical body so as to form a cleavage section in the longitudinal direction, and a heat-resistant film is wrapped around the outer surface of the laminate, and then the laminate is fixed at room temperature or under heating if necessary. By curing the uncured insulating elastomer and then removing the shaping cylinder, a hollow tubular heater having a structure as shown in FIGS. 8 and 9 is completed.

(Problem to be Solved by the Invention) However, in the conventional hollow tubular heater shown in FIGS. 4 to 7, the aluminum foil heater 21 is fixed to the exposure light source 22 with an adhesive 27. Therefore, it became difficult to attach and detach the exposure light source 22, and the aluminum foil heater 21 and the exposure light source 2
There was a problem in that the aluminum foil heater 21 and the exposure light source 22, which had the defect No. 2, had to be replaced, making efficient maintenance and management impossible.

As a means for solving the above problem, a hollow tubular heater having a structure as shown in FIGS. 8 and 9 is known.
A heating element 4 made of uncured insulating elastomer
1 and cover the shaping cylinder so as to form a cleavage in the longitudinal direction, and after fixing the laminate by wrapping a heat-resistant film or the like around its outer surface, uncured insulation Since the cured insulating elastomer layers 43 and 44 are formed by curing the elastomer, as shown in FIG. 10, the layer thickness of the cured insulating elastomer layer 43 (t shown in FIG. 10) It is difficult to make the temperature uniform because it easily fluctuates, and when the exposure light source 22 is attached and energized, the temperature distribution tends to be uneven, which poses a problem in terms of reliability. The reason why the layer thickness t of the cured insulating elastomer layer 43 tends to fluctuate and is difficult to make uniform is that when curing the uncured insulating elastomer that will become the cured insulating elastomer layers 43 and 44, the shaping cylinder is The heating element 41 and the cured insulating elastomer layers 43 and 44 are placed on the body and fixed, and pressure is applied to prevent them from peeling or lifting, and this pressure causes the uncured insulating elastomer resin to This is thought to be due to the heat generating element 41 being moved due to the flow. For this reason, when the light source 22 for exposure is attached and energized, the temperature distribution becomes uneven.

Therefore, the present invention is capable of easily attaching and detaching the exposure light source, efficiently performing maintenance management, and making temperature distribution uniform.
It is an object of the present invention to provide a hollow tubular heater that can improve reliability.

(Means for Solving the Problems) A hollow tubular heater according to a first aspect of the present invention has a reinforcing layer made of a resin molded product formed in a cylindrical shape with a cleavage part in the axial direction. A first insulating layer made of a cured insulating elastomer is fixed to be adhered to the inner surface of the layer, and a first insulating layer is attached to the inner surface of the layer, and
A heat generating element is fixed to the inside surface of the insulating layer, with a second insulating layer insulatingly bonded to one or both surfaces of the heating element.

In order to achieve the above object, the hollow tubular heater according to the second invention has a reinforcing layer made of a resin molded product formed into a circular tube shape with a cleavage part in the axial direction, and an inner surface of the reinforcing layer made of a cured insulating elastomer. A groove is formed in a predetermined shape on the inner surface of the first insulating layer, which is the surface opposite to the surface bonded to the reinforcing layer. A heating element is embedded in the groove, and a second insulating layer is bonded and fixed to the inner surface of the first insulating layer, covering the heating element.

(Function) In the hollow tubular heater according to the first invention, the reinforcing layer made of a resin molded product is formed into a circular tube shape with a cleavage part in the axial direction, and the inner surface of the reinforcing layer has a reinforcing layer made of a hardened insulating elastomer. The first resin layer is fixed so as to be adhered, and the second insulating layer is insulated on one or both sides of the inner surface of the first insulating layer, which is the opposite side to the surface bonded to the reinforcing layer. The heating element is fixed to the heating element.

In the hollow tubular heater according to the second invention, the reinforcing layer made of a resin molded product is formed into a circular tube shape with a cleavage part in the axial direction, and the first insulating layer made of a cured insulating elastomer is provided on the inner surface of the reinforcing layer. A groove is formed in a predetermined shape on the inner surface of the first insulating layer, which is the surface opposite to the surface where the layers are bonded and connected to the reinforcing layer, and a heating element is embedded in the groove. A second insulating layer is bonded and fixed to the inner surface of the first insulating layer so as to cover the heating element.

Therefore, according to the first and second inventions, the exposure light source can be easily attached and detached, and maintenance management can be performed efficiently. Then, when the light source is attached to an exposure light source, the temperature distribution can be made uniform, and reliability can be improved.

(Example) Hereinafter, an example of the present invention will be described in detail with reference to the drawings. It should be noted that, as a matter of course, the following example shows an example of the present invention, and the present invention is not limited only to this example.

1 and 2 are diagrams for explaining an embodiment of a hollow tubular heater according to the first invention, and FIG. 1 is a side view showing the configuration of an embodiment of the first invention, and FIG.
The figure is a sectional view showing the configuration of an embodiment of the first invention.

In these figures, 1 is a lead wire, 2 is a housing for connecting to an external circuit, and 3 is a reinforcing layer made of a resin molded product (extrusion molded product, injection molded product) such as polyarylate. It is formed into a cylindrical shape with a cleavage part at the bottom, preferably has a certain degree of rigidity, and has a predetermined bending radius so that it can be evenly attached to the exposure light source when attached to the exposure light source. It is better. 4a and 4b are adhesive layers made of an adhesive such as room temperature curing type (or thermosetting type) liquid silicone rubber, and 5 is a curing layer such as foamed silicone rubber formed by extrusion molding (press molding may also be used). The first insulating layer is made of an insulating elastomer, preferably having a function of improving heat insulation and adhesion to the exposure light source, and may be made of, for example, fluorine rubber. Reference numeral 6 denotes a heating element made of, for example, a ribbon-shaped metal foil such as stainless steel (conductive rubber may also be used), and is adapted to generate a predetermined amount of electric power. 7 is a second insulating layer made of polyether sulfon, for example.

Note that here, the heating element 6 and the second insulating layer 7 are bonded to each other by heat bonding. The heating element 6 may be bonded to the layer 7. The adhesive layer 4a includes the reinforcing layer 3 and the first insulating layer 5.
The adhesive layer 4b is an adhesive layer that adheres the first insulating layer 5 and the heating element 6. For example, a temperature control device (not shown) such as a thermistor,
Usually attached to the top of a hollow tubular heater.

That is, in the above embodiment, as shown in FIG. 2, the reinforcing layer 3 made of a resin molded product is formed into a circular tube shape with a cleavage part in the axial direction, and the inner surface of the reinforcing layer 3 is hardened in advance. The first insulating layer 5 made of a cured insulating elastomer is fixed by an adhesive that becomes the adhesive layer 4a, and the inner side of the first insulating layer 5 is the surface opposite to the surface bonded to the reinforcing layer 3. The second insulating layer 7 is insulated on one side (or both sides may be used) of the heat generating element 6, which is bonded to the surface of the heating element 6, and is fixed to the surface of the heating element 6 with an adhesive serving as the adhesive layer 4b. It can be easily attached and detached from the exposure light source, allowing for efficient maintenance and management, and it can even out the temperature distribution when connected to the exposure light source and is energized, improving reliability. can be done. Here, the temperature distribution can be made more uniform than in the conventional case by using the second insulating layer 7 formed to have a substantially uniform layer thickness.

FIG. 3 is a diagram illustrating an embodiment of the hollow tubular heater according to the second invention, and specifically, a sectional view thereof.

In this figure, the same reference numerals as in FIGS. 1 and 2 indicate the same or corresponding parts, and 4c is an adhesive layer made of an adhesive such as room-temperature curing (or thermosetting) liquid silicone rubber, and 5a is a The first insulating layer is made of a cured insulating elastomer such as foamed silicone rubber and is formed by press molding, and grooves 8 are formed in a predetermined shape on the surface opposite to the surface bonded to the reinforcing layer 3. There is. Reference numeral 6a denotes a heating element made of a heater wire having a resistance wire such as nickel chrome, and preferably has a cord-like structure as shown in FIG. 7. Any heating element may be used as long as it can be well embedded in the groove 8 formed in the groove 8.

That is, in the above embodiment, as shown in FIG. 3, the reinforcing layer 3 made of a resin molded product is formed into a circular tube shape with a cleavage part in the axial direction, and the inner surface of the reinforcing layer 3 is pre-hardened. A first insulating layer 5a made of a cured insulating elastomer is fixed to be bonded with an adhesive to become an adhesive layer 4a, and the first insulating layer 5a is a surface opposite to the surface bonded to the reinforcing layer 3. A groove 8 is formed in a predetermined shape on the inner surface, and a heating element 6a is appropriately embedded in this groove 8.
Since the second insulating layer 7 is fixed to the inner surface of the first insulating layer 5a by covering the first insulating layer 5a with an adhesive that becomes the adhesive layer 4c, it is easy to attach and detach it from the exposure light source. It can be easily performed, maintenance management can be performed efficiently, temperature distribution can be made uniform, and reliability can be improved. Here, the temperature distribution can be made more uniform than the conventional one by using the first insulating layer 5a in which the depth of the groove 8 is almost uniform, and by embedding the heating element 6a in this groove 8 as appropriate. This can be achieved by covering and adhering the second insulating layer 7, which is formed to have a substantially uniform layer thickness.

(Effects) According to the first and second inventions, the exposure light source can be easily attached and detached, maintenance and management can be performed efficiently, temperature distribution can be made uniform, and the exposure light source can be easily attached and detached. It has the effect of improving sexual performance.

[Brief explanation of the drawing]

1 and 2 are diagrams for explaining an embodiment of a hollow tubular heater according to the first invention, and FIG. 1 is a side view showing the configuration of an embodiment of the first invention, and FIG.
The figure is a sectional view showing the configuration of an embodiment of the first invention,
FIG. 3 is a diagram for explaining an embodiment of a hollow tubular heater according to the second invention, FIGS. 4 to 7 are diagrams for explaining an example of a conventional hollow tubular heater, and FIG. 4 is a diagram for explaining an example of a conventional hollow tubular heater. 5 is a diagram showing the details of the conventional aluminum foil heater, FIG. 6 is a diagram showing the details of part A of the conventional example, and FIG. 7 is a diagram showing the aluminum foil heater attached to the exposure light source. 8 and 9 are diagrams illustrating other examples of the conventional hollow tubular heater. FIG. 8 is a perspective view showing the configuration of the conventional example; FIG. 9 is a sectional view showing the configuration of a conventional example. FIG. 10 is a diagram illustrating the problems of the conventional example. DESCRIPTION OF SYMBOLS 1... Lead wire, 2... Housing, 3... Reinforcement layer, 4a, 4b, 4c... Adhesive layer, 5, 5a...
...first insulating layer, 6, 6a... heating element, 7... second insulating layer, 8... groove.

Claims (1)

[Scope of Claims] 1 A reinforcing layer made of a resin molded product is formed into a circular tube shape with a cleavage part in the axial direction, and a first insulating layer made of a cured insulating elastomer is adhered to the inner surface of the reinforcing layer. A heat-generating layer is fixed to the inside surface of the first insulating layer, which is the surface opposite to the surface bonded to the reinforcing layer, and a second insulating layer is bonded to insulate one or both sides of the inner surface of the first insulating layer. A hollow tubular heater, characterized in that it is configured to be fixed so as to adhere to the body. 2. The hollow tubular heater according to claim 1, wherein the heating element is made of a ribbon-shaped metal foil. 3. A reinforcing layer made of a resin molded product is formed into a circular tube shape with a cleavage part in the axial direction, and a first insulating layer made of a cured insulating elastomer is fixed to be adhered to the inner surface of the reinforcing layer, A groove is formed in a predetermined shape on the inner surface of the first insulating layer, which is the surface opposite to the surface bonded to the reinforcing layer, a heating element is embedded in the groove, and the heating element is covered. A hollow tubular heater characterized in that a second insulating layer is adhesively fixed to an inner surface of the first insulating layer. 4. The hollow tubular heater according to claim 3, wherein the heating element is made of a cord-shaped heater wire having a resistance wire.