JPH0652833B2 - Eraser for copier - Google Patents

Description

Detailed Description of the Invention

[Industrial applications]

The present invention relates to an eraser used by being attached to a copying machine.

[Prior art]

As this type of eraser, the structure shown in FIGS. 11 to 12 is well known as a conventional example. In the configuration of this conventional example, 1 is a substrate on which electronic components such as ICs and resistors are mounted, and the substrate is attached substantially integrally with the flexible substrate 2 on which wiring is printed, and the corresponding electronic component is an electrical component. Are electrically connected to each other, and the LED mounting substrate 3 is integrally adhered and fixed to the flexible substrate 2 and electrically connected to the corresponding wiring, so that the LED can be connected to the electronic component.
Are configured to be driven. In actual use, the LED mounting board 3 is used in a state in which the direction is changed by approximately 90 °, that is, the flexible board 2 is bent, as shown by an imaginary line. 4 is L
ED and 5 are lenses.

[Problems to be Solved by the Invention]

In the conventional eraser, the electronic component mounting substrate, the flexible substrate, and the LED mounting substrate are separately formed, and they must be united and electrically connected. However, there is a problem in that the size of the copying machine cannot be made smaller, the size of the copying machine becomes larger as a whole, and the size of the copying machine cannot be made smaller. Further, even if the size can be reduced, there are problems in measures against stray light and measures against heat dissipation.

[Means for Solving the Problems]

As a concrete means for solving the problems of the conventional example, the present invention wire-bonds a bare chip IC, a bare chip LED, etc., and mounts other electronic parts, and radiates heat to the back side of the area where each of them is mounted. A single film-like flexible printed circuit board to which a plate is attached is provided at a position corresponding to the heat dissipation plate, and a flat plate and a rising plate having a recess having a depth substantially the same as the thickness of the heat dissipation plate are formed into a substantially L-shaped section. To provide an eraser for a copying machine, characterized in that a heat dissipation plate is fitted into a concave portion of the flat plate and is integrally wound and attached to a block fin formed in a strip shape. The flexible printed circuit board has a structure in which electronic parts are mounted by dividing the area so as to correspond to the area of each mounting surface of the block fin, and printed wiring is formed. It by no need to consider the connection pitch and the like, thus mounting pitch of the bare chip LED may also be considerably narrower, it can reduce the overall size of the thereby. Also, since the number of connection points can be reduced,
Reliability is improved and man-hours are reduced.

【Example】

Next, the present invention will be described in detail with reference to the illustrated embodiment. Reference numeral 10 is a block fin for heat dissipation and attachment to a copying machine, which is wound around the peripheral surface of the block fin 10 to mount the film-like flexible printed circuit board 20. At the same time, an eraser is integrally formed with a connector 30 for supplying electric power to the film-like flexible printed circuit board 20. The block fin 10 is formed of a flat plate 11 and a rising plate 12 and has an L-shaped cross section. Then, recesses 13 and 14 having a predetermined depth are formed on both front and back surfaces of the flat plate 11,
A black alumite or black paint is applied on the whole to form a black color. The film-like flexible printed board 20 is formed of a polyimide-based or polyester-based film capable of die-bonding and wire-bonding, and is divided into approximately three areas A, B, and C as shown in FIG. A printed wiring 21 made of Cu foil is formed. Of these areas, an area A is an IC mounting area on which a bare chip IC 22 is mounted, an area B is a resistor mounting area on which a resistor 23 is mounted, and an area C is a bare chip LED 24. It is an LED mounting area. In this way, the printed wirings 21 that connect the respective areas are formed in series, and the wiring interval is about 1 mm. Therefore, the mounting interval of each electronic component, particularly the bare chip LED, which is connected and mounted on the equal wiring, is mounted. Is about 1 mm. Then, on the back side of each of the above-mentioned areas, heat sinks 25, 2 made of aluminum are respectively provided.
6,27 are installed respectively. The mounting structure of these heat radiating plates is as shown in FIG. 5, and they are integrally mounted on the film-like flexible printed circuit board 20 by using an insulating adhesive or the like. The heat radiating plates 25, 26, 27 themselves are black-colored or black-painted as a whole so as to be insulated and blackened. The front and back surfaces of the film-like flexible printed circuit board 20 are entirely covered and protected by an insulating protective film 28 except for the connection parts of the electronic components. Then, by applying this protective film by using, for example, a black resin coating, it is possible to make the color black as a whole, and it is possible to maintain sufficient insulation between the heat radiation plate and the heat radiation plate. The film-like flexible printed circuit board 20 configured as described above is attached to the block fin 10 so as to be wound. In this case, the heat dissipation plate 25 of the film-shaped flexible printed circuit board 10 is fitted into the recess 13 on the surface side of the flat plate 11 of the block fin 10, and is fixed by adhesion with, for example, an adhesive, and then the film-shaped flexible printed circuit board. The flat plate 11 is bent along the free end of the flat plate 11 and positioned on the back surface side.
So that the film-shaped flexible printed circuit board is bent so that it fits on the rising plate 12,
The rising plate 12 and the heat dissipation plate 27 are integrally bonded and fixed with an adhesive or the like to complete the winding, and the film-shaped flexible printed circuit board 20 on which various electronic parts are mounted is integrated with the block fin 10 in a stable state. It is installed by winding it around. After that, the connector 30 is fixed on the aluminum substrate 10 with an insulating adhesive and a screw or the like via an appropriate insulating member, and each terminal is electrically connected to the printed wiring 24. . On the front side of the bare chip LED 24, the stray light shielding member 32 integrally or separately formed as shown in FIGS.
The lens 34 is attached via the mask member 33. The stray light shielding member and the mask member are formed of, for example, black resin, and partition portions 32a and 33a are provided corresponding to the arrangement intervals of the bare chip LEDs 24.
Are individually partitioned so that light does not interfere with each other. As shown in FIGS. 9 to 10, the lens 34 is formed in a long series of transparent acrylic resin or the like, and the lens portion 35 is formed adjacent to each corresponding bare chip LED 24. The upper surface on the opposite side is formed flat. The presence of each of these lens portions 35 and the stray light shielding member 32 and the mask member 33 prevent the lens 34 itself from serving as a light guide. Further, the lens 34 does not necessarily need to use the stray light shielding member 32 and the mask member 33 if the other portions except the lens portion 35 are black. In this case, each bare chip LED 24 exactly faces the lens portion 35,
Make sure that adjacent lens parts do not interfere with each other.

【The invention's effect】

As described above, the eraser for a copying machine according to the present invention wire-bonds bare chip ICs and bare chip LEDs, and also mounts other electronic parts, and radiates heat to the back surface of the area where each of them is mounted. A single sheet of film-shaped flexible printed circuit board attached with a heat sink is provided at a position corresponding to the heat sink with a flat plate and a rising plate having a recess having a depth substantially the same as the thickness of the heat sink. The heat dissipation plate is fitted into the concave portion of the flat plate in the block fin formed in 1. so that the block fin is integrally wound and attached. There is no connection, and there is no need to take a large space for connection. Therefore, not only the mounting pitch of electronic parts can be significantly narrowed and downsizing can be achieved, but also workability and Excellent effects referred to as rich in production properties. Also, by mounting the electronic parts on the film-like flexible printed circuit board in different areas so as to correspond to the area of each mounting surface of the block fins and by performing the printed wiring, the mounting work of each electronic part can be concentrated. This also brings about the excellent effect of being rich in workability and productivity. Further, for each area where each electronic component is mounted, a black heat radiating plate is attached to the back surface side of the area through an insulating adhesive or the like, a flexible printed board is formed in black, and a bare chip is used. By using the lens having the lens portion protruding toward the IC and the bare chip LED side, the heat dissipation effect of each electronic component is enhanced, and at the same time, stray light is absorbed and various troubles due to stray light can be avoided. .

[Brief description of drawings]

1 is a plan view showing an embodiment of an eraser for a copying machine according to the present invention, FIG. 2 is an enlarged sectional view taken along line II-II of FIG. 1, and FIG. 3 is a plan view showing a flexible printed circuit board. ,
FIG. 4 is a side view of the flexible printed circuit board, FIG. 5 is an enlarged perspective view of a part of the flexible printed circuit board, and FIG. 6 is a part of a stray light shielding member used in the eraser of the present invention. 7 is an enlarged plan view, FIG. 7 is an enlarged cross-sectional view of an essential part showing the arrangement state of the stray light shielding member, and FIG. 8 is an essential sectional view showing the arrangement state of the stray light shielding member and the mask member. FIG. 9 is an enlarged sectional view, FIG. 9 is a bottom view of the lens, FIG. 10 is a side view of the lens, FIG. 11 is a plan view of an eraser of a conventional example, and FIG. 12 is a side view of the eraser. 10 …… Block fin 11 …… Flat plate, 12 …… Standing plate 13,14 …… Concave 20 …… Film flexible printed circuit board 21 …… Printed wiring, 22 …… Bare chip IC 23 …… Resistance, 24 …… Bare chip LED 25, 26, 27 ...... Heat sink, 28 ...... Protective film 30 ...... Connector, 32 ...... Stray light shielding member 32a, 33a ...... Partition part 33 ...... Mask member, 34 ...... Lens 35 ...... Lens part

Claims (5)

[Claims] 1. A film-shaped flexible film, in which a bare chip IC, a bare chip LED, and the like are wire-bonded and other electronic components are mounted, and a heat sink is attached to the back side of the area where each of them is mounted. The printed board is placed at a position corresponding to the heat radiating plate on a block fin formed in a substantially L-shaped cross section with a flat plate and a rising plate having a recess having a depth substantially the same as the thickness of the heat radiating plate. An eraser for a copying machine, characterized in that a heat dissipation plate is fitted into a concave portion of a face plate so as to be integrally wound and attached. 2. A film-like flexible printed circuit board,
2. An eraser for a copying machine according to claim 1, wherein electronic parts are mounted in different areas so as to correspond to the areas of the mounting surfaces of the block fins, and printed wiring is provided. 3. The eraser for a copying machine according to claim 1, wherein a heat radiating plate is attached to the back surface side of each area on which each electronic component is mounted via a black insulating layer. 4. A film-shaped flexible printed circuit board,
The eraser for a copying machine according to claim 1, 2 or 3, wherein the eraser is formed of a wire-bondable polyimide-based or polyester-based film and is formed in black. 5. A black mask and a stray light shielding member integrally or separately formed are provided on the upper surface of the film-like flexible printed circuit board, and a lens having a flat upper surface is arranged above the black mask and the stray light shielding member. It is provided, The claim 1 characterized by the above-mentioned.
An eraser for a copying machine according to item 2, 3 or 4.