JP2007273705A - Mounting structure of light guide body for led - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To prevent disconnection of pattern of a printed circuit board, while improving the workability of attachment of a light guide body for LED. <P>SOLUTION: In a first and a second side of mutually facing light guide bodies 40, a first and a second engaging part 42a, 42b are provided, a small shaft 43, 43 is provided protrudingly, in a third and a fourth side perpendicularly intersecting with the first and the second side. In the mounting hole 41 of a front case 25, a first and a second engaged part 41a, 41b with which the first and the second engaging part 42a, 42b engages respectively are provided. While the facing portion of the mounting hole 41 that faces mutually is made to be deformed elastically by the small shaft 43 of the light guide body 40 inserted into the mounting hole 41, the light guide body 40 is pushed in the inside of the front case 25. By engaging the small shaft 43 to the lower end edge of the facing portion of the mounting hole 41, the light guide body 40 is mounted to the mounting hole 41, while a clearance is provided between the frond edge of a light guide portion 40f and a LED 44. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to an LED light guide mounting structure that guides light emitted from an LED provided in a housing to the outside of the housing.

As a conventional LED light guide mounting structure, a light guide having a pair of small shafts projecting from both sides, an upper case provided with an exposure window for fitting the light guide, and the upper Some have a U-shaped groove that is provided inside the case and rotatably supports a small shaft, and a pair of clamping walls that are formed with the U-shaped groove and sandwich a light guide. In assembly in such a structure, the small shaft of the light guide inserted into the upper case is engaged in the U-shaped groove, and the light guide is rotated around the small shaft as a rotation center. The light body is sandwiched between the pair of sandwiching walls, and the light guide is fitted to the exposure window. Next, by coupling the lower case to the upper case, the printed circuit board provided on the lower case contacts the light guide, and the light guide is sandwiched between the printed circuit board and the upper case (for example, Patent Document 1). reference).
JP 2005-223044 A (paragraphs “0016” to “0020”, FIGS. 4 to 6)

  In the conventional LED light guide mounting structure described above, in order to mount the light guide to the upper case, the small shaft is engaged with the U-shaped groove in the upper case, or the light guide is paired with a pair of holding walls. Since it has to be sandwiched inside, there is a problem that assembly is complicated and workability is poor. In addition, since the light guide is in contact with the printed circuit board, the printed circuit board is deformed when the light guide is pressed from the outside of the upper case, or the pattern wired on the printed circuit board is disconnected. There was also a problem of doing.

  The present invention has been made in view of the above-described conventional problems, and an object of the present invention is to improve the workability of assembling the light guide and prevent disconnection of the pattern on the printed circuit board. .

  In order to achieve this object, an invention according to claim 1 includes an LED provided in a housing, a light guide that guides light emitted from the LED to the outside of the housing, and the light guide provided in the housing. An attachment hole for attaching the body from the outside of the housing, and provided with an engaging portion that engages with an opening edge of the attachment hole on each of the first and second side surfaces of the light guide opposite to each other, The third and fourth side surfaces orthogonal to the first and second side surfaces are each provided with a protrusion that elastically deforms the facing portions of the mounting hole that face each other and engages with the edge of the facing portion. is there.

  The invention according to claim 2 is the invention according to claim 1, wherein one of the engaging portions is locked by a part of a panel formed by a transparent member attached to the surface of the casing.

  The invention according to claim 3 is the invention according to claim 1 or 2, wherein the LED is mounted on a printed circuit board provided in the housing, and a gap is provided between the tip of the light guide and the LED. Is.

  According to the first aspect of the invention, since the light guide is attached by simply inserting it into the attachment hole from the outside of the housing, attachment is extremely easy and workability is improved.

  According to the invention which concerns on Claim 2, a light guide is firmly attached to a housing, when a light guide is latched by a panel.

  According to the invention of claim 3, even if the light guide is temporarily pressed from the outside of the housing, a gap is provided between the light guide and the LED, so the printed circuit board on which the LED is mounted Will not be deformed or the pattern wired on the printed circuit board will not break.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is an exploded perspective view of a telephone having an LED light guide mounting structure according to the present invention, FIG. 2 shows the LED light guide, FIG. 1A is a perspective view, and FIG. Is a front view, FIG. (C) is a side view, FIG. (D) is a rear view, FIG. (E) is a bottom view, and FIG. 3 is a plan view showing the upper half of the front case, FIG. 4 and FIG. Fig. 4 is a cross-sectional view taken along line IV-IV in Fig. 3, in which Fig. 4 shows a state in which the light guide is inserted into the attachment hole, Fig. 5 shows a state in which the light guide is attached in the attachment hole, It is the perspective view seen from the inner surface side of the front case which shows the state which attached the light guide to the attachment hole.

  1 is provided with a rear case 2 as a first casing. The rear case 2 is integrally formed from the bottom 4 and the periphery of the bottom 4 so as to surround the bottom 4. It is formed in the substantially box shape by which the opening 2a was provided in the downward side in the figure by the standing wall 3 standing. The bottom portion 4 is provided with a large number of speaker holes 4a and a storage recess 5 for storing a storage battery. The enclosure wall 3 is formed in series by an upper wall 3A, a lower wall 3B, and both side walls 3C, 3D, and the lower side in the figure where the charging terminals 7, 7 are engaged is opened at both ends of the lower wall 3B. A pair of grooves 6 and 6 are provided. 5a and 5a are recesses (one recess 5a is not shown) provided at the bottom of the storage recess 5, and an insertion hole (not shown) is provided at the bottom. 20 and 8 are inserted through the front case 25 as a second housing. Reference numeral 9 denotes an antenna provided on the upper wall 3A.

  Reference numeral 10 denotes a printed circuit board on which electronic components are mounted. A pattern is printed on the front and back surfaces, and an LCD display 11 is attached to the back surface. The printed circuit board 10 has three holes 12 for attaching a holder 16 to be described later, a pair of fitting holes 13 and 13 for fitting studs 38 and 38 of a key panel 37 to be described later, and a front case 25 to be described later. A pair of fitting holes 14 and 14 into which the studs 32 and 32 are fitted are provided. Reference numeral 15 denotes a speaker for ringing a ring tone, which is attached to the printed circuit board 10 through the holder 16 by fitting a stud 17 protruding from the bottom of the holder 16 into the hole 12 of the printed circuit board 10.

  Reference numeral 20 denotes a key sheet which is formed in a substantially rectangular shape by a flexible sheet as a whole, and is provided with a dial button and a number of function buttons (not shown) arranged in a matrix. By pressing these dial buttons and function buttons, the support part provided in the part is elastically deformed, and the contact provided in the support part is configured to turn on the switch wired on the printed circuit board 10. Yes. Reference numerals 24 and 24 denote insertion holes through which the screws 8 and 8 are inserted.

  Reference numeral 25 denotes a front case, which has a substantially box shape in which an opening 28 is provided on the upper side in the figure by a bottom 26 and a surrounding wall 27 standing integrally from the periphery of the bottom so as to surround the bottom 26. Is formed. On the bottom portion 26, a window 29 for displaying the LCD display 11, a dial button window 30 and a function button arranged in a matrix for slidably supporting the dial buttons are slidably supported. A large number of function button windows 31 and 31a are provided.

  32 and 32 are studs standing on the bottom portion 26 of the front case 25, and screws 33 and 33 for connecting the rear case 2 and the front case 25 and for attaching a charging terminal 7 to be described later to the stud 45. Are screwed together. The enclosure wall 27 is formed in series by an upper wall 27A, a lower wall 27B, and both side walls 27C and 27D, and an engaging portion (not shown) of the rear case 2 is engaged with the inner surface of the upper wall 27A. Engaged portions 34 and 34 are provided.

  The rear case 2 and the front case 25 are rotatably supported around the engaging portion and the engaged portion 34 as a rotation center, and are coupled by screwing a screw 33 to the stud 32 as described later. The Reference numeral 35 denotes a function button formed in a disk shape that is swingably supported by the function button window 31a of the front case 25. A panel 36 for the LCD display 11 formed of a transparent member is attached to the front case 25 so as to cover the window 29 of the front case 25.

  Reference numeral 37 denotes a key panel provided on the surface of the front case 25 so as to cover a part of the front case 25, for screwing screws 8 and 8 for attaching the printed circuit board 10 and the key sheet 20 to the front case 25. A pair of studs 38, 38 are provided upright.

  Reference numeral 40 denotes a light guide that guides light emitted from an incoming-display LED 44 described later to the outside of the front case 25, and is entirely made of transparent plastic. As shown in FIG. 2, the light guide 40 includes first and second side surfaces 40a and 40b, and third and fourth side surfaces 40c and 40d orthogonal to the first and second side surfaces 40a and 40b. And a light guide portion 40f that is formed in a substantially rectangular parallelepiped shape by the upper surface 40e and that extends obliquely downward at the lower portion.

  Each of the first and second side surfaces 40a and 40b is provided with first and second engaging portions 42a and 42b that are integrally projected in opposite directions, and the second side surface 40b and the upper surface. A lens portion 42c formed in an arc shape in side view is provided so as to straddle 40e. Each of the third and fourth side surfaces 40c and 40d is integrally provided with small shafts 43 and 43 as protrusions having a very small protruding amount, and the upper end surface of the small shaft 43 is the second engaging surface. It is positioned slightly lower (height δ in the figure) than the lower end surface of the joining portion 42b. Further, the small shaft 43 is provided with an engaging portion 43a at the upper portion and a guide portion 43b formed in a wedge shape so that the protruding amount gradually decreases downward at the lower portion.

  3 and 4, reference numeral 41 denotes an attachment hole for attaching the light guide 40, which is provided across the bottom portion 26 of the front case 25 and the upper wall 27 </ b> A of the surrounding wall 27. The mounting hole 41 is formed in a rectangular shape in plan view, and is formed in a step shape on the opening edge on the bottom 26 side as shown in FIG. 4, and is engaged with the first engaging portion 42a of the light guide 40 described above. A first engaged portion 41a is provided as an opening edge to be joined. In addition, a second engaged portion 41b serving as an opening edge with which the second engaging portion 42b of the light guide 40 is engaged is provided at the opening end edge of the mounting hole 41 on the upper wall 27A side. A guide portion 41c is provided which is connected to the second engaged portion 41b and is inclined downward toward the first engaged portion 41a. A width W2 of the mounting hole 41 is slightly larger than the width W1 of the light guide 40 described above. 41d is a vertical surface with which the end face 42g of the first engaging portion 42a of the light guide 40 is engaged when the light guide 40 is attached to the attachment hole 41, and the first engaged portion 41a. It is connected to. In FIG. 3, 41 e and 41 e are opposing portions of the mounting hole 41 that are elastically deformed by the small shafts 43 and 43 of the light guide 40 when the light guide 40 is attached to the mounting hole 41. The small shafts 43 and 43 engage with the lower end edges 41f and 41f. Reference numeral 44 denotes an incoming call display LED mounted on the printed circuit board 10.

  Next, a method for assembling the telephone set configured as described above will be described. First, as shown in FIG. 4, the light guide 40 is grasped by hand, and the light guide portion 40 f of the light guide 40 is inserted into the mounting hole 41 of the front case 25 from the outside of the front case 25. When the pair of small shafts 43 and 43 of the light guide 40 abut on the facing portions 41e and 41e of the mounting hole 41, the light guide 40 is moved to the front case while the facing portions 41e and 41e are elastically deformed by the small shafts 43 and 43. Push into 25. At this time, since the guide portion 43b is provided on the small shaft 43, the light guide 40 is smoothly guided into the front case 25 by the guide portion 43b, and the small shaft 43 is engaged as shown in FIG. The portion 43a engages with the lower end edges 41f and 41f of the facing portions 41e and 41e of the mounting hole 41. At the same time, the first and second engaging portions 42a and 42b of the light guide 40 are engaged with the first and second engaged portions 41a and 41b of the mounting hole 41, respectively. In this state, the end surface 42g of the first engaging portion 42a of the light guide 40 abuts on the vertical surface 41d of the first engaged portion 41a of the mounting hole 41, and the upper end portion of the light guiding portion 40f. The side surface 40h contacts the guide portion 41c. Further, the gap t is formed between the tip of the light guide 40 f of the light guide 40 and the LED 44.

  As described above, the end surface 42g of the first engaging portion 42a contacts the vertical surface 41d of the first engaged portion 41a, and the side surface 40h of the upper end portion of the light guide portion 40f contacts the guide portion 41c. Therefore, the light guide 40 attached to the attachment hole 41 is restricted from moving in the left-right direction in the drawing. Further, the engaging portion 43 a of the small shaft 43 engages with the lower end edges 41 f and 41 f of the facing portions 41 e and 41 e of the mounting hole 41, and the first engaging portion 42 a of the light guide 40 is the first of the mounting holes 41. In order to engage with one engaged portion 41a, the light guide 40 attached to the attachment hole 41 is restricted from moving in the vertical direction in the figure. Further, the engaging portion 43a of the small shaft 43 engages with the lower end edges 41f and 41f of the facing portions 41e and 41e of the mounting hole 41, and the first and second engaging portions 42a and 42b of the light guide 40 are respectively provided. However, since it engages with the first and second engaged portions 41a, 41b of the attachment hole 41, the light guide 40 attached to the attachment hole 41 is restricted from rotating.

  The light guide 40 can be attached to the attachment hole 41 simply by inserting the light guide 40 into the attachment hole 41 provided in the front case 25 from the outside of the front case 25, so that the attachment is easy and the workability is improved. In addition, since a gap t is formed between the tip of the light guide 40f of the light guide 40 and the LED 44, the LED 44 is mounted even if the light guide 40 is pressed from the outside of the front case 25. There is no case where the printed circuit board 10 is deformed or the pattern wired on the printed circuit board 10 is disconnected.

  Next, by attaching the panel 36 to the surface of the bottom 26 of the front case 25, the upper surface 40e of the light guide 40 is covered by a part of the panel 36 as shown in FIG. For this reason, the light guide 40 is firmly attached to the mounting hole 41 because the panel 36 restricts movement and rotation of the light guide 40 in the vertical direction.

  As shown in FIG. 1, the function button 35 is inserted into the function button window 31 a of the front case 25, the key sheet 20 is placed on the front case 25, and the printed circuit board 10 is placed on the studs 32, 32 of the front case 25. The printed circuit board 10 is placed on the key sheet 20 by fitting the fitting holes 14, 14. The charging terminal 7 is inserted into the groove 6 of the rear case 2, and the rear case 2 is positioned above the front case 25.

  Subsequently, the engaging portion of the rear case 2 is engaged with the engaged portion 34 of the front case 25, and the rear case 2 is rotated around the engaging portion and the engaged portion 34 as a rotation center. The opening ends of the cases 2 and 25 are brought into contact with each other so that the opening 2a of the front case 25 and the opening 28 of the front case 25 face each other. In this state, the screws 33 and 33 inserted through the insertion holes 45 a and 45 a are inserted through the holes of the charging terminal 7 and the fitting holes 14 of the printed circuit board 10, and screwed into the studs 32 and 32 of the front case 25.

  By this screwing, the rear case 2 and the front case 25 are coupled to form the casing body of the telephone 1, and the charging terminal 7 is attached to the front case 25. Next, the studs 38, 38 of the key panel 37 are inserted through the function button windows 31, 31 of the front case 25 and the insertion holes 24, 24 of the key sheet 20, and are fitted into the fitting holes 13, 13 of the printed circuit board 10. The key panel 37 is temporarily fixed to the surface of the front case 25. In this state, by screwing the screws 8 and 8 inserted into the recesses 5a and 5a of the rear case 2 into the studs 38 and 38 of the key panel 37, the printed board 10, the key sheet 20, and the key panel 37 are moved to the front case 25. And the telephone 1 is assembled.

It is a disassembled perspective view of the telephone which implemented the attachment structure of the light guide for LED which concerns on this invention. The light guide for LED which concerns on this invention is shown, The figure (A) is a perspective view, The figure (B) is a front view, The figure (C) is a side view, The figure (D) is a rear view, The figure (E) is a bottom view. It is a top view which shows the upper half of the front case in the telephone which implemented the attachment structure of the light guide for LED which concerns on this invention. FIG. 4 is a cross-sectional view taken along line IV-IV in FIG. 3, and FIG. 4 shows a state in which the light guide is inserted into the mounting hole. FIG. 4 is a cross-sectional view taken along line IV-IV in FIG. 3, showing a state where the light guide is attached to the attachment hole. It is the perspective view seen from the inner surface side of the front case which shows the state which attached the light guide for LED which concerns on this invention to the attachment hole.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Telephone, 10 ... Printed circuit board, 25 ... Front case, 40 ... Light guide, 41 ... Mounting hole, 41a ... First engaged part, 41b ... Second engaged part, 41e ... Opposing part, 42a ... 1st engagement part, 42b ... 2nd engagement part, 42c ... Lens part, 42f ... Light guide part, 43 ... Small shaft, 43a ... Engagement part, 44 ... LED.

Claims (3)

  An LED provided in the housing; a light guide that guides light emitted from the LED to the outside of the housing; and a mounting hole that is provided in the housing and attaches the light guide from the outside of the housing. An engaging portion that engages with the opening edge of the mounting hole is provided on each of the first and second side surfaces of the body that face each other, and third and fourth sides that are orthogonal to the first and second side surfaces. A mounting structure for an LED light guide, characterized in that each of the side surfaces is provided with a protrusion that elastically deforms a facing portion of the mounting hole facing each other and engages with an edge of the facing portion.   2. The LED light guide mounting structure according to claim 1, wherein one of the engaging portions is locked by a part of a panel formed by a transparent member attached to the surface of the housing.   3. The LED light guide according to claim 1, wherein the LED is mounted on a printed circuit board provided in the housing, and a gap is provided between a tip of the light guide and the LED. Mounting structure.

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