JP5466909B2 - Electronics - Google Patents

Description

  The present invention relates to an electronic device that can irradiate the back of a key top.

  Mobile phones are widely used as this type of electronic equipment. The mobile phone includes a substrate on which a plurality of dome switches are disposed, and a plurality of key tops for pressing the dome switches, and the substrate includes a light emitting element that illuminates the back of the key top, such as an LED ( Light Emitting Diode) is mounted (for example, Patent Document 1).

  Conventionally, in order to illuminate the entire back of a plurality of key tops with light from a light emitting element, in the above-described mobile phone, the plurality of dome switches are covered with a light guide sheet, and the light is emitted from the light emitting element. It has been proposed to be arranged so as to be incident from (for example, Patent Document 2). In this mobile phone, light from the light emitting element passes through the inside of the light guide sheet and is guided to the back portions of the plurality of key tops, and the entire back portions are illuminated.

JP 2000-173380 A JP 2008-226576 A

  However, in the above mobile phone, since it is necessary to dispose the light emitting element on the side end face side of the light guide sheet, there is a problem that the area of the substrate increases by the area where the light emitting element is mounted, and the mobile phone is enlarged. was there.

  Accordingly, an object of the present invention is to provide an electronic device that can illuminate the entire back portion of a plurality of key tops and can be miniaturized.

  A first electronic device according to the present invention includes a substrate on which a plurality of switches are disposed, and a plurality of key tops disposed on the substrate for pressing the switches. At least one light emitting element for illuminating the back of the key top is mounted. Here, a light transmissive sheet is disposed between the substrate and the plurality of key tops so as to cover the plurality of switches and the light emitting elements, and on the surface of the light transmissive sheet on the key top side, A light reflecting layer that reflects light from the light emitting element is formed in a region covering the light emitting element.

  In the first electronic device, after the light emitted from the light emitting element passes through the light transmissive sheet, a part of the light is reflected by the light reflecting layer, and the remaining light passes through the light reflecting layer or its surroundings. Will do. Here, part of the reflected light passes through the light transmissive sheet, propagates to the edge of the light transmissive sheet, and is diffused on the side end surface of the light transmissive sheet.

  Accordingly, the back part of the key top disposed in the vicinity of the light emitting element is illuminated by the light that has passed through the light reflecting layer or the periphery of the light reflecting layer, and the light diffused on the side end surface of the light transmissive sheet is illuminated. The back portion of the key top disposed near the side end surface of the light transmissive sheet is illuminated. Therefore, the entire back portion of the plurality of key tops is illuminated by the light emitting element.

  In the first electronic device, since the light transmissive sheet can be provided so as to cover the light emitting element, the light emitting element can be mounted at various positions on the surface of the substrate. Therefore, the first electronic device according to the present invention reduces the area of the substrate as compared with the conventional electronic device that includes the light guide sheet and the position of the light emitting element is limited to the side end face side of the light guide sheet. Thus, the electronic device can be downsized.

In the specific configuration of the first electronic device, a second light reflecting layer that reflects light incident from the key top side is formed on the surface of the substrate in a region different from the mounting region of the light emitting element. Has been.
According to this specific configuration, since the second light reflecting layer is formed in a region different from the mounting region of the light emitting element in the surface of the substrate, the light emitted from the light emitting element is the second light. It is not blocked by the reflective layer. Of the light reflected by the light reflecting layer formed on the light transmitting sheet, the light leaking from the light transmitting sheet without propagating through the light transmitting sheet is reflected by the second light reflecting layer. Will be led to the back of the key top. Therefore, the illumination efficiency by the light emitting element is improved.

In another specific configuration of the first electronic device, one or more slits are formed at an edge of the light transmissive sheet.
According to the specific configuration, by forming the slit at the edge of the light transmissive sheet, the area of the side end surface of the light transmissive sheet is increased by the inner surface constituting the slit. For this reason, the light that has passed through the light-transmitting sheet and is guided to the edge of the light-transmitting sheet is easily diffused at the side end surface of the light-transmitting sheet, and therefore easily guided to the back of the key top. . Therefore, the illumination efficiency by the light emitting element is improved.

  A second electronic device according to the present invention includes a board on which a plurality of switches are disposed, and a plurality of key tops disposed on the board for pressing the switches. At least one light emitting element for illuminating the back of the key top is mounted. Here, a light transmissive sheet is provided between the substrate and the plurality of key tops so as to cover the plurality of switches and the light emitting elements, and one or more slits are provided at an edge of the light transmissive sheet. Is formed.

  In the second electronic device, a part of the light emitted from the light emitting element passes through the light transmissive sheet, and a part of the remaining light passes through the light transmissive sheet. It propagates to the edge of the transmissive sheet and diffuses at the side end face of the light transmissive sheet. Here, since the slit is formed in the edge part of the light transmissive sheet, the area of the side end face of the light transmissive sheet is increased by the inner surface constituting the slit. For this reason, the light that has passed through the light-transmitting sheet and is guided to the edge of the light-transmitting sheet is easily diffused on the side end surface of the light-transmitting sheet.

  Accordingly, the back of the key top disposed in the vicinity of the light emitting element is illuminated by the light that has passed through the light transmissive sheet, and the light diffused on the side end surface of the light transmissive sheet is used to illuminate the light transmissive sheet. The back portion of the key top disposed in the vicinity of the side end surface is illuminated. Therefore, the entire back portion of the plurality of key tops is illuminated by the light emitting element.

  In the second electronic device, since the light transmissive sheet can be provided so as to cover the light emitting element, the light emitting element can be mounted at various positions on the surface of the substrate. Therefore, the second electronic device according to the present invention reduces the area of the substrate as compared with the conventional electronic device that includes the light guide sheet and the position of the light emitting element is limited to the side end face side of the light guide sheet. Thus, the electronic device can be downsized.

  In a more specific configuration of the first and second electronic devices, the light-emitting elements are mounted at a plurality of locations on the substrate, the light-emitting elements are arranged in a line, and the slits are the light-emitting elements. It extends in a direction substantially perpendicular to the arrangement direction.

  The electronic device according to the present invention can illuminate the entire back portion of a plurality of key tops, and can be miniaturized.

FIG. 1 is an exploded perspective view showing a slide type mobile phone according to an embodiment of the present invention. FIG. 2 is a perspective view showing a closed state of the slide type mobile phone. FIG. 3 is a perspective view showing an open state of the slide type mobile phone. FIG. 4 is an exploded perspective view showing a main part including the operation part of the slide type mobile phone. FIG. 5 is a perspective view showing the back surface of the rubber sheet of the operation unit. FIG. 6 is a front view of the lower cabinet showing the arrangement state of the dome switches and the LEDs provided in the slide type mobile phone. FIG. 7 is a front view of the lower cabinet showing a state in which the second PET sheet included in the sliding mobile phone is attached. FIG. 8 is a front view of the substrate covered with the second PET sheet. FIG. 9 is a cross-sectional view taken along line AA shown in FIG.

Hereinafter, the embodiment in which the present invention is applied to a slide-type mobile phone will be described in detail with reference to the drawings.
As shown in FIG. 1, the slide type mobile phone according to an embodiment of the present invention includes two cabinets (1) and (2). ) Is deployed. An operation unit (4) is provided on the surface of the first cabinet (1), and a liquid crystal display (20) is provided on the surface of the second cabinet (2).

  Both cabinets (1) and (2) are slidably connected to each other by a slide mechanism (3). The slide mechanism (3) includes a guide part (31) and a slide part (32). The guide part (31) is fixed to an area different from the area where the operation part (4) is arranged in the surface of the first cabinet (1), and the slide part (32) is the back surface of the second cabinet (2). It is fixed to.

  A pair of guide grooves (311) (311) extending in the longitudinal direction of the first cabinet (1) is formed at both left and right ends of the guide section (31), and the pair of guide grooves (311) (311) ), The left and right end portions (321) and (321) of the slide portion (32) are slidably engaged with each other. Thereby, the moving direction of the slide part (32) is prescribed | regulated to the longitudinal direction of the 1st cabinet (1).

  Therefore, by sliding the two cabinets (1) and (2), the slide type mobile phone has the cabinets (1) and (2) closed as shown in FIG. The closed state covered by (2) and the open state where both cabinets (1) and (2) are opened and the operation unit (4) is exposed as shown in FIG. 3 are selectively set. It will be.

  As shown in FIG. 4, the operation unit (4) includes a sheet key (41) formed on the surface of a first PET (polyethylene terephthalate) sheet (43) and a double-sided adhesive tape (45). And a plurality of dome switches (51) to (51) disposed on the surface of the substrate (5).

  A plurality of key tops (44) to (44) are formed on the surface of the sheet key (41) opposite to the first PET sheet (43). Specifically, fifteen key tops (44) to (44) are formed on the surface of the sheet key (41), and each of the fifteen key tops (44) to (44) is five. Are arranged in a line in the longitudinal direction of the first cabinet (1) and arranged in 5 rows × 3 columns.

  On the back surface of the first PET sheet (43), marks such as numbers and characters corresponding to the key tops (44) are printed at positions facing the key tops (44) to (44), respectively. Here, the sheet key (41) is formed from a resin having high light transmittance, and the first PET sheet (43) is formed from a PET material having high light transmittance. Therefore, the mark printed on the back surface of the first PET sheet (43) can be visually recognized from the front side of the sheet key (41) via the sheet key (41).

  The plurality of dome switches (51) to (51) are respectively disposed at positions facing the plurality of key tops (44) to (44), one for each key top (44). Specifically, as shown in FIG. 6, 15 dome switches (51) to (51) are arranged on the surface of the substrate (5), and the 15 dome switches (51) to (51) are arranged. ) Are arranged in 5 rows × 3 columns so as to face 15 key tops (44) to (44), respectively.

  As shown in FIG. 5, a plurality of protrusions (47) are formed on the back surface of the rubber sheet (46). In the assembled state of the sliding mobile phone, each protrusion (47) is interposed between the key top (44) and the dome switch (51) facing each other, and the push applied to the key top (44). It functions as a transmission part that transmits pressure to the dome switch (51). Therefore, by pressing each key top (44), the dome switch (51) corresponding to the key top (44) is set to the on state.

  As shown in FIG. 4, a plurality of LEDs (52) to (52) for illuminating the backs of the key tops (44) to (44) are provided on the back surface of the rubber sheet (46). It is mounted for. Specifically, as shown in FIG. 6, eight LEDs (52) to (52) are mounted on the surface of the substrate (5), and the eight LEDs (52) to (52) Four pieces are arranged in a line in the longitudinal direction of the first cabinet (1) and arranged in 4 rows × 2 columns. The two rows of LEDs (52) to (52) are arranged one by one between the three rows of dome switches (51) to (51).

  As shown in FIG. 4, a light reflecting sheet (53) capable of reflecting light incident from the key top (41) side is further attached to the surface of the substrate (5). Here, the light reflecting sheet (53) covers an area different from the mounting area of the LEDs (52) to (52). Therefore, the light emitted from each LED (52) is not blocked by the light reflecting sheet (53).

The second PET sheet (6) is interposed between the substrate ( 5 ) and the rubber sheet (46). In the assembled state of the slide type mobile phone, as shown in FIG. 7, the second PET sheet (6) covers the plurality of dome switches (51) to (51) and the plurality of LEDs (52) to (52). Deployed. Here, the second PET sheet (6) is formed of a PET material having high light transmittance.

  As shown in FIG. 4, a plurality of slits (61) to (61) are formed on the left and right edges of the second PET sheet (6). Specifically, as shown in FIG. 7, a plurality of edges of the second PET sheet (6) are cut in a direction substantially perpendicular to the arrangement direction of the four LEDs (52) to (52) forming the row. Thus, a plurality of slits (61) to (61) are formed. Accordingly, each slit (61) extends in a direction substantially perpendicular to the arrangement direction of the four LEDs (52) to (52) forming a row.

  As shown in FIG. 4, two rectangular third PET sheets (7) and (7) are attached to the surface of the second PET sheet (6) on the rubber sheet (46) side. Specifically, as shown in FIG. 7, each third PET sheet (7) is attached to an area covering all the four LEDs (52) to (52) forming a row in the surface of the second PET sheet (6). It is worn.

  Each third PET sheet (7) is formed of a PET material colored in white. Therefore, when light from the LED (52) enters the third PET sheet (7), a part of the light is reflected by the third PET sheet (7), and the remaining light is absorbed by the third PET sheet (7). Alternatively, it passes through the third PET sheet (7). Therefore, the third PET sheet (7) functions as a light reflecting layer that reflects part of the light from the LEDs (52) to (52).

  In the slide type mobile phone, the light emitted from the LED (52) passes through the second PET sheet (6), and a part of the light is emitted from the third PET as shown by the one-dot chain arrows L1 to L3 in FIG. Reflected by the sheet (7), the remaining light passes through the third PET sheet (7) or its surroundings. Here, as indicated by a one-dot chain line arrow L3, a part of the reflected light passes through the second PET sheet (6) and propagates to the edge of the second PET sheet (6), and the second PET sheet. It diffuses at the side end face of (6).

  Accordingly, the back of the key top (44) disposed in the vicinity of the LED (52) is illuminated by the light (dotted line arrow L1) that has passed through the third PET sheet (7) or its periphery, and the second PET sheet ( The back part of the key top (44) disposed in the vicinity of the side end surface of the second PET sheet (6) is illuminated by the light diffused on the side end surface of 6) (the one-dot chain line arrow L3). Therefore, the entire back portions of the plurality of key tops (44) to (44) are illuminated by the LED (52).

  Further, as indicated by the one-dot chain line arrow L2, the light leaked from the second PET sheet (6) without propagating through the second PET sheet (6) out of the light reflected by the third PET sheet (7) It is reflected by the reflection sheet (53) and guided to the back of the key top (44). Therefore, the sliding mobile phone has high illumination efficiency by the LED (52).

  In the slide type mobile phone, a plurality of slits (61) to (61) are formed at the edge of the second PET sheet (6). Therefore, the area of the side end surface of the second PET sheet (6) is increased by the inner surface (surface formed by cutting the edge portion) constituting each slit (61). For this reason, as indicated by the one-dot chain line arrow L3, the light that passes through the second PET sheet (6) and is guided to the edge of the second PET sheet (6) is incident on the side end surface of the second PET sheet (6). Are easily diffused, and are therefore easily guided to the back of the key top (44). Therefore, the sliding mobile phone has high illumination efficiency by the LED (52).

  Furthermore, in the above-mentioned slide type mobile phone, since the second PET sheet (6) can be disposed so as to cover the plurality of LEDs (52) to (52), the LED ( 52) to (52) can be mounted. Therefore, compared to a conventional mobile phone that includes a light guide sheet and the position of a light emitting element such as an LED is limited to the side end face side of the light guide sheet, the slide type mobile phone according to the present embodiment has a substrate (5 ) To reduce the size of the slide-type mobile phone.

In addition, each part structure of this invention is not restricted to the said embodiment, A various deformation | transformation is possible within the technical scope as described in a claim.
For example, in the slide type mobile phone, various switches can be adopted instead of the dome switch (51). The key top (44) is not limited to the one formed on the sheet key (41). Further, in the slide type mobile phone, various light emitting elements can be adopted instead of the LED (52).

  Further, the shape and arrangement of the slit (61) are not limited to the above embodiment, and various shapes and arrangements are possible. For example, the slit (61) may be opened or recessed in the second PET sheet (6).

  Further, in the above slide type mobile phone, it is possible to adopt a configuration in which the third PET sheet (7) (7) is not provided. Further, the various configurations employed in the slide type mobile phone can be applied not only to the mobile phone but also to various electronic devices that can illuminate the key top.

(44) Key top
(5) Board
(51) Dome switch
(52) LED (light emitting device)
(53) Light reflecting sheet (second light reflecting layer)
(6) Second PET sheet (light transmissive sheet)
(61) Slit
(7) Third PET sheet (light reflecting layer)

Claims (5)

A board having a plurality of switches, and a plurality of key tops disposed on the board for pressing the switches, wherein the board has at least one light emission for illuminating the back of the key tops; In an electronic device on which an element is mounted,
A light-transmitting sheet is disposed between the substrate and the plurality of key tops so as to cover the plurality of switches and the light-emitting elements, and the light-emitting element is disposed on the surface of the light-transmitting sheet on the key top side. An electronic apparatus, wherein a light reflection layer that reflects part of light from the light emitting element and transmits the remaining light is formed in a covered region.   2. The electronic apparatus according to claim 1, wherein a second light reflecting layer that reflects light incident from the key top side is formed on a surface of the substrate in a region different from a region where the light emitting element is mounted.   The electronic device according to claim 1, wherein one or more slits are formed at an edge of the light transmissive sheet. Wherein with the light emitting element is mounted at a plurality of positions of the substrate, the light emitting element are arranged in a row, the slits, according to claim 3 which extends in a direction substantially perpendicular to the array direction of the light emitting element Electronic equipment. A substrate having a plurality of switches are disposed, deployed on the substrate comprising a plurality of key tops for pressing the switch, the substrate, it illuminates the back of the key top light emission element In electronic devices equipped with
Between the substrate and the plurality of key tops, a light transmissive sheet is disposed to cover the plurality of switches and the light emitting elements, and enters the edge of the light transmissive sheet from the back side, One or more slits for diffusing the light that has passed through the translucent sheet are formed ,
The light emitting elements are mounted at a plurality of locations on the substrate, the light emitting elements are arranged in a line, and the slits extend in a direction substantially perpendicular to the arrangement direction of the light emitting elements. Electronics.

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