JP4898645B2 - Component surface treatment method and component - Google Patents

Description

  The present invention relates to a component surface treatment method and a component capable of suppressing the stickiness of a component made of silicone rubber having light transmittance.

  Silicone rubber parts have excellent light transmission (transparency), heat resistance, weather resistance, adhesiveness, etc., but the surface is sticky, which causes sticking to other adjacent parts and hinders handling. (See Patent Documents 1 and 2).

In view of this point, conventionally, the surface of a silicone rubber component is subjected to UV treatment, corona treatment, or diamond-like carbon treatment to suppress and prevent the stickiness on the component surface.
JP 2004-200093 A JP 2007-27115 A

  However, when UV treatment or corona treatment is performed on the surface of a silicone rubber component, it is surface modification, so that it has poor durability against changes with time, leading to a decrease in reliability. In addition, when diamond-like carbon treatment is applied to the surface of the part, the sticky feeling can be suppressed and prevented, but since carbon is deposited on the surface of the part, there is a high possibility that it will be colored and impair the light transmittance. .

  The present invention has been made in view of the above, and an object of the present invention is to provide a component surface treatment method and component that suppresses stickiness, improves durability and reliability against aging, and does not impair light transmission. It is said.

In the present invention, in order to solve the above-mentioned problem, a silicone rubber that guides light from a light source located around the contact layer between the contact layer and the operation layer of the portable device and causes the light emitting portion of the operation layer to emit A surface treatment method for a component that interposes a manufactured component and suppresses the stickiness of the component,
The component is a light-transmitting light guide layer that contacts the contactable contact portion of the contact layer, and the surface of the light guide layer is contacted with the contact portion of the contact layer by spraying a silane compound together with an oxidation flame. A silicon oxide film is laminated on the surface of the light guide layer .

Here, the silicone rubber in the claims may be added with an additive such as a silicone resin for improving the strength, as long as the transparency is not greatly affected . The surface of the component may be the lower surface or the side surface in addition to the upper surface. Further, the light source may be an LED, an EL (surface light emitter), or the like, and there is no particular need for a plurality.

According to the present invention, a silane coupling agent is sprayed together with an oxidation flame on a component composed of a light guide layer, and a silicon oxide film is laminated on the surface of the component, thereby improving durability over time and reducing reliability. Suppression can be prevented and productivity can be improved. In addition, the production process can be shortened, the production cost can be reduced, the defect rate can be reduced, and the environmental load can be reduced.

According to the present invention, a silane compound is sprayed on the surface of the light guide layer together with an oxidation flame, and a silicon oxide film, which is an easily adhesive substance that suppresses the stickiness of the light guide layer, is actively applied to the surface of the light guide layer. Since the layers are formed, there are effects that durability against changes with time can be improved, a decrease in reliability can be suppressed, and productivity can be improved.

Further, since the surface of the light guide layer is not subjected to diamond-like carbon treatment, there is little possibility that the light guide layer is colored and impairs light transmission, and the light emitting portion of the operation layer can be made to emit light appropriately. In addition, since the silicon oxide film is formed instead of modifying the surface of the light guide layer, shortening of the production process, reduction of production cost, reduction of defective rate, reduction of environmental load, and the like can be expected.

  Hereinafter, a preferred embodiment of the present invention will be described with reference to the drawings. A surface treatment method of a component in the present embodiment is a light guide layer which is an optical component of a mobile phone 1 as shown in FIGS. The silicon oxide film 3 is formed on the surface 2, and the light oxide layer 3 suppresses the sticky feeling of the light guide layer 2.

  As shown in FIGS. 2 and 3, the light guide layer 2 is formed into a substantially plate shape that can be bent using a flexible silicone rubber having light transmittance, and is operated with the metal dome layer 10 of the mobile phone 1. The operation layer 20 is interposed between the layer 20 and indirectly covers the metal dome 11 of the metal dome layer 10 and guides light rays from the plurality of LEDs 24 positioned around the metal dome layer 10 in the XY directions. The light emitting unit 21 functions to emit light.

  On the surface of the light guide layer 2, a nano-level sized silicon oxide film 3 that suppresses the stickiness of the light guide layer 2 is formed in irregularities (see FIGS. 4 to 7). The processing apparatus shown in FIGS. 8 and 9 is used to form a thin laminate by spraying a small amount of the silane coupling agent 4 onto the surface of the light guide layer 2 together with the oxidation flame by the burner 5.

  On the back surface of the light guide layer 2, a plurality of transmissive patterns 6 that pass and scatter the guided light beam are screen-printed side by side with white ink, and the plurality of transmissive patterns 6 are subjected to gradation processing with reference to the LEDs 24. That is, the plurality of transmission patterns 6 are dot-printed small so that the transmission pattern 6 close to the plurality of LEDs 24 is large, and large dots are printed so that the transmission pattern 6 far from the plurality of LEDs 24 emits light strongly, and the light is emitted uniformly as a whole. It works as follows.

  Each transmission pattern 6 is partitioned and formed into a predetermined shape such as a plane rectangle, a polygon, a fan shape, or an arc shape by a plurality of dots, for example, and emits surface light by the passage and scattering of light rays. The white ink is prepared, for example, by containing titanium oxide in a silicone-based ink.

  As shown in FIGS. 2 and 3, the metal dome layer 10 is provided with a plurality of metal domes 11 that perform contact functions by pressing operation on the surface, and the plurality of metal domes 11 are formed on the flexible protective layer 12. It is covered and mounted on the flexible printed wiring board 13. The protective layer 12 is made of, for example, polyethylene terephthalate that is stable to light or heat, and is bonded to the surface of the metal dome layer 10 and is contact-coated on the surface of the light guide layer 2 provided with the silicon oxide film 3. .

  As shown in FIGS. 2 and 3, the operation layer 20 is formed into a substantially plate-shaped cross section using, for example, polycarbonate or a predetermined film, and a plurality of light emitting portions 21 are arrayed, and the peripheral portion is light. It adheres to the guide layer 2 via an adhesive tape or the like. The light emitting unit 21 includes a plurality of transparent or translucent key tops 22 arranged at predetermined intervals, and a frame body 23 surrounding a commander that can swing back and forth and from side to side. The commander is appropriately pressed by the user.

  The plurality of key tops 22 and the frame body 23 are opposed to the plurality of transmission patterns 6 of the light guide layer 2, and light is emitted when light rays are scattered through the plurality of transmission patterns 6. Each key top 22 is printed with characters, numbers, designs, and the like necessary for the operation of the mobile phone 1 and is pressed by the user so that the metal dome 11 of the metal dome layer 10 is turned on via the light guide layer 2. It functions to operate OFF. Further, as shown in FIG. 2 and FIG. 3, the plurality of LEDs 24 are arranged side by side in the front, rear, left, and right around the metal dome layer 10 so as to be close to and opposed to the peripheral surface of the light guide layer 2. A light beam is incident on 2 from the lateral direction.

  In the above-described configuration, when the plurality of LEDs 24 emit light, light rays are incident on the light guide layer 2 from the plurality of LEDs 24 and guided, and pass through and scatter through the respective transmission patterns 6 to cause the transmission patterns 6 to emit light. Due to the surface emission of the pattern 6, the plurality of key tops 22 and the commander frame 23 emit light (illuminate). Further, when the key top 22 is pressed, the metal dome 11 of the metal dome layer 10 is pressed through the light guide layer 2 or its silicon oxide film 3, and predetermined functions such as a transmission function and a reception function of the mobile phone 1 are set. The function is executed.

  According to the above configuration, the silane coupling agent 4 is instantaneously sprayed onto the surface of the light guide layer 2 by the burner 5 together with the oxidation flame, and the adhesiveness to suppress the stickiness of the light guide layer 2 to the surface of the light guide layer 2 is easily adhered. Since the silicon oxide film 3 which is a substance is actively laminated and formed, durability against changes with time can be remarkably improved, and a decrease in reliability can be suppressed and productivity can be improved. Further, since the surface of the light guide layer 2 is not subjected to diamond-like carbon treatment, the light guide layer 2 is very unlikely to be colored and impair the light transmission, and the light emitting portion 21 of the operation layer 20 can appropriately emit light. Can do.

  In addition, by forming the silicon oxide film 3 on the light guide layer 2, the light guide layer 2 comes into contact with the protective layer 12, but does not come into close contact, so that an abnormal light emitting portion 21 is generated in the operation layer 20. Can be suppressed and prevented. Further, since the light guide layer 2 is not in direct contact with the protective layer 12 via a film or the like, but the light guide layer 2 is in direct contact with the protective layer 12, a good tack feeling can be greatly expected. Further, since the silicon oxide film 3 is formed instead of modifying the surface of the light guide layer 2, it is possible to greatly expect shortening of the production process, reduction of production cost, reduction of defective rate, reduction of environmental load, and the like.

  In the above embodiment, the mobile device including the mobile phone 1 is shown. However, the present invention is not limited to this. For example, a mobile device including a PDA or a game machine may be used. Further, the metal dome layer 10, the operation layer 20, and the light guide layer 2 may have a substantially rectangular plane, a substantially polygonal plane, or the like. Furthermore, the operation layer 20 and the plurality of key tops 22 may be integrated or separate.

Hereinafter, a part surface treatment method according to the present invention and examples of parts will be described together with comparative examples.
Example A silicon oxide film was formed on the surface of a part made of silicone rubber having optical transparency by an Itro (registered trademark) processing apparatus, and a PET film (trade name: Lumirror T56 # 100) was formed on the surface of the part by a rubber roller. The peel strength when the PET films were laminated and peeled at 180 ° and 90 ° angles was measured, and the stickiness (tackiness) was summarized in Table 1.

  As shown in FIG. 8 and FIG. 9, the itro processing device is located under the burner, the silane coupling agent to be vaporized, the LPG gas mixed with the silane coupling agent, the burner burned by them, and the burner. A type equipped with a metal conveyor that carries parts and conveys them under the flame of the burner, specifically, a 1 burner type device (made by Ishimat Japan) using the CCVD method, with an effective width Was 150 mm. When operating the itro processing apparatus, the silane coupling agent was operated at 1.8 l / min, LPG gas 3.5 l / min, and air 100 l / min.

  As a procedure for forming the silicon oxide film, first, the conveyor was set to a predetermined speed (0.33 m / min) and operated, and the height from the burner to the conveyor was set to a predetermined height (40 mm). Once the height from the burner to the conveyor is adjusted in this way, the itoro treatment device is activated and ignited, and the flame is ejected from the burner to form the silicon oxide film formation treatment state. A silicon oxide film was formed by being conveyed and passed below.

  The measurement method was based on the JIS K 6256 vulcanized rubber and thermoplastic rubber adhesion test method (180 ° peel) and the JIS Z 0237 90 ° peel adhesion measurement method (90 ° peel). Moreover, the test speed of the conveyor of the itro processing apparatus was set to 50 mm / min and 300 mm / min. Furthermore, the data measured and adopted were average values of 8 points (n = 2 × 4 points).

Comparative Example A PET film (trade name: Lumirror T56 # 100) was laminated with a rubber roller without forming a silicon oxide film on a silicone rubber part having light transmittance, and this PET film was angled at 180 ° and 90 °. Table 1 summarizes the feeling of tackiness (tackiness) by measuring the peeling force at the time of peeling. Others were the same as in the example.

  As is clear from Table 1, in the case of the example, the peeling force was smaller than that of the comparative example, and a small stickiness (tackiness) could be obtained.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective explanatory view schematically showing a cellular phone in a component surface treatment method and component embodiment according to the present invention. It is explanatory drawing which shows typically the light guide layer in embodiment of the components which concern on this invention. It is a section explanatory view showing typically a metal dome layer, an operation layer, and a light guide layer in an embodiment of the parts concerning the present invention. It is an electron micrograph which shows the silicon oxide film of the light guide layer in embodiment of the components which concern on this invention. It is an electron micrograph which expands and shows FIG. It is another electron micrograph which shows the silicon oxide film of the light guide layer in embodiment of the components which concern on this invention. It is an electron micrograph which expands and shows FIG. It is a whole explanatory view showing typically the formation method of the silicon oxide membrane in the embodiment of the surface treatment method of the parts concerning the present invention. It is principal part explanatory drawing which shows typically the formation method of the silicon oxide film in embodiment of the surface treatment method of the components which concern on this invention.

Explanation of symbols

1 Mobile phone 2 Light guide layer (parts)
3 Silicon oxide film (silicon film)
4 Silane coupling agent 5 Burner 6 Transmission pattern 10 Metal dome layer (contact layer)
11 Metal dome (contact part)
12 Protective layer 20 Operation layer 21 Light emitting part 22 Key top 24 LED (light source)

Claims (2)

Between the contact layer and the operation layer of the portable device, a silicone rubber part that guides the light from the light source located around the contact layer and emits the light emitting part of the operation layer is interposed. A surface treatment method for a component that suppresses feeling ,
The component is a light-transmitting light guide layer that contacts the contactable contact portion of the contact layer, and the surface of the light guide layer is contacted with the contact portion of the contact layer by spraying a silane compound together with an oxidation flame. A method for surface treatment of a component, comprising forming a silicon oxide film on the surface of a light guide layer . A part that has been surface-treated by the surface treatment method for a part according to claim 1 .