JP2012230998A - Attachment structure of lens for led - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent light emitted from an LED from being leaked to an adjacent lens and improve the attachment workability.SOLUTION: A lens 25 for an LED, leading out light emitted from an LED 14 mounted on a printed board 10 mounted on a lower case 3 to the exterior of the lower case 4, is attached to the lower case 3. The lens 25 for the LED is composed of: multiple light guide bodies 26; a connection part 27 connecting with the multiple light guide bodies 26; and a lens part 28. The lens 25 for the LED is tentatively held on the lower case 3 by engaging the light guide bodies 26 with a first groove 31a and engaging the connection body 27 with the second groove. Then, the lens 25 for the LED is attached to the lower case 3 by a first regulation part 33a when the upper case 4 is coupled to the lower case 3.

Description

  The present invention relates to an LED lens mounting structure for deriving light emitted from an LED.

  A conventional LED lens mounting structure includes an upper case provided with a lens fitting rib, a lower case to which a printed circuit board is attached, and an LED lens connected at a predetermined interval by a connecting member. The lower end of the LED lens whose upper end is fitted to the lens fitting rib is brought into contact with the upper surface of the printed circuit board, and the printed circuit board is screwed to the lower case in this state, so that the LED lens is There is what is pinched with a case (for example, refer to patent documents 1).

JP 2000-286568 A (paragraphs [0009] to [0011], FIGS. 1 to 13)

  In the LED lens mounting structure as described above, the lens fitting rib provided on the upper case only covers a part of the upper end portion of the lens and does not block between adjacent LEDs. There is a problem that light directly emitted from the LED cannot be prevented from leaking to the adjacent lens side. When mounting the LED lens, the printed circuit board is attached to the boss of the lower case while the lens is held by fitting the upper end to the lens fitting rib of the upper case and bringing the lower end into contact with the printed circuit board. There was also a problem that workability was poor due to screwing.

  The present invention has been made in view of the above-described conventional problems, and an object of the present invention is to prevent leakage of light emitted from an LED to an adjacent lens and improve workability of attachment.

  In order to achieve this object, the present invention provides a lower case in which an upper portion is opened and a plurality of lens holes are provided on a side wall, an upper case that covers the opening of the lower case, and a plurality of LEDs are mounted on the lower case. The printed circuit board supported by the LED, a plurality of light guides for individually guiding the light emitted from the LEDs, a connecting body for connecting the light guides, and a lens portion exposed from the lens hole are integrated. In the LED lens mounting structure comprising the LED lens formed on the plurality of LED lenses, a plurality of the lens cases positioned between the plurality of light guides and extending to the printed circuit board are in contact with the surface of the printed circuit board. The light shielding piece is integrally provided.

  According to the present invention, in the above-described invention, the lower case is provided with a first rib in which the respective light guides are engaged and a first groove is formed that restricts movement of the LED lens in the left-right direction, and the light shielding is performed. A second groove is provided in the piece to restrict the movement of the LED lens in the front-rear direction, and the upper case is in contact with the connection body, and the first groove of the LED lens and A second rib provided with a restricting portion for restricting removal from the second groove is provided corresponding to the lens hole.

  According to the present invention, in any one of the above inventions, the lower case is provided with a supporting boss for supporting the printed circuit board, and the upper case is provided with an abutting boss that contacts the surface of the printed circuit board. In the state where one end side of the printed circuit board is inserted below the light shielding piece, the lower case and the upper case are coupled, so that the other end side of the printed circuit board is brought into contact with the support boss. It is sandwiched between bosses.

  According to the present invention, the light shielding piece is extended to the printed circuit board, and the lower surface is brought into contact with the surface of the printed circuit board, so that the light emitted from the LED mounted on the printed circuit board is applied to the adjacent LED lens. There is no leak.

  According to one of the inventions, the lens portion of the LED lens is fitted into the lens hole of the lower case, the light guide is engaged with the first groove, and the coupling body is engaged with the second groove. By doing so, the LED lens is temporarily held in the lower case. In this state, since the LED lens can be attached to the lower case at the same time by the operation of joining the lower case and the upper case, the workability of the attachment is improved.

  According to one of the inventions, by inserting one end side of the printed board below the light shielding piece, the printed board is temporarily held in the lower case by the light shielding piece and the supporting boss. Thus, since the printed circuit board can be attached to the lower case at the same time by the operation of joining the lower case and the upper case, the workability of the attachment is improved.

It is a perspective view which decomposes | disassembles and shows the electronic device which implemented the attachment structure of the lens for LED which concerns on this invention. It is a perspective view of the state which turned the upper case of the electronic device which implemented the attachment structure of the lens for LEDs concerning this invention. It is a perspective view of the state which mounted the printed circuit board and the LED lens in the lower case of the electronic device which implemented the attachment structure of the LED lens which concerns on this invention. It is a top view which fractures | ruptures and shows a part of electronic device which implemented the attachment structure of the lens for LED which concerns on this invention. FIG. 5 is a cross-sectional view taken along line VV in FIG. 4. It is the VI-VI sectional view taken on the line in FIG. It is the VII-VII sectional view taken on the line in FIG. It is the VIII-VIII sectional view taken on the line in FIG. FIG. 4A is a plan view of an LED lens according to the present invention, and FIG. 4B is a view taken along arrow IX (B) in FIG.

  Hereinafter, embodiments of the present invention will be described with reference to FIGS.

  1 includes a lower case 3 that is open at the top and has an opening 2, and an upper case 4 that is attached to the lower case 3 so as to cover the opening 2 of the lower case 3. With. The lower case 3 is formed by a bottom plate 5 and an enclosure wall 6 erected from the outer peripheral edge of the bottom plate 5. Upper portions of both ends of the side wall 7 on the arrow A direction side constituting a part of the enclosure wall 6. Is provided with a pair of hook hanging portions 8,8. In addition, a plurality of lens holes 9 are provided in the side wall 7 at equal intervals in the direction of the arrow CD, and a lens portion 28 of an LED lens 25 described later is fitted from the inside of the lower case 3 to be exposed to the outside. It has been. A supporting boss 11 </ b> A (see FIG. 7) that supports the printed circuit board 10 is erected on the end of the bottom plate 5 of the lower case 3 on the arrow A direction side.

  Further, at the end of the bottom plate 5 of the lower case 3 on the arrow B direction side, a supporting boss 11B (see FIG. 8) is provided which supports the printed circuit board 10 and has a small diameter portion 11b formed on the upper portion. Further, the bottom plate 5 of the lower case 3 is integrally provided with a regulating piece 12 for restricting the movement of the printed circuit board 10 supported by these supporting bosses 11A and 11B in the width direction (arrow CD direction) and a coupling boss 13. Is erected. A plurality of LEDs 14 are mounted on the end of the printed board 10 in the arrow A direction at equal intervals in the arrow CD direction.

  As shown in FIG. 2, the upper case 4 is formed with an opening 17 whose lower side is opened by an upper plate 15 and a surrounding wall 16 erected from the outer peripheral edge of the upper plate 15. At both ends on the arrow A direction side, hook portions 18 and 18 that are hung on the hook hook portions 8 and 8 are provided upright. Further, at the end of the upper plate 15 of the upper case 4 in the arrow B direction, bosses 19 and 19 provided with holes through which screws 21 are inserted and the surface of the printed circuit board 10 supported by the supporting boss 11B. Abutting bosses 20, 20 that abut against the erection are erected.

  By being configured in this way, the hook portion 18 of the upper case 4 is hooked on the hook hook portion 8 of the lower case 3, and the hook wall portion 8 is pivoted about the pivot wall 8 to rotate the surrounding walls 6 with each other. , 16 are brought into contact with each other. Next, as shown in FIG. 1, the screws 21 inserted through the bosses 19 of the upper case 4 are screwed into the coupling bosses 13 of the lower case 3 so that the openings 2 and 17 are closed. Cases 3 and 4 are joined together to form a housing of electronic device 1.

  The LED lens generally indicated by reference numeral 25 in FIG. 9 introduces light emitted from the LED 14 from the light introduction surface 26a at one end, guides the introduced light while totally reflecting it, and guides it from the lead-out surface 26b at the other end. A plurality of light guides 26 having a reverse L-shape in a side view and having a rectangular cross section, and a plurality of light guides 26 connected to be arranged in a row at equal intervals. The connecting body 27 is integrally formed with the lens portion 28 which is joined to the lead-out surface 26b of the light guide 26 and exposed to the outside from the lens hole 9.

  On the inner side of the side wall 7 of the lower case 3, as shown in FIG. 1, a plurality of light shielding pieces 30 mounted on the printed circuit board 10 and positioned between adjacent LEDs 14 are projected in a direction perpendicular to the side wall 7. As shown in FIG. 7, the lower surface of the light shielding piece 30 extends to the surface of the printed circuit board 10 mounted on the lower case 3 and forms a contact surface 30 a that contacts the surface of the printed circuit board 10. . Further, a second groove 30b having an upper opening in which the coupling body 27 of the LED lens 25 is engaged is provided on the light shielding piece 30. Therefore, when the connecting body 27 is engaged with the second groove 30b, the LED lens 25 is restricted from moving in the front-rear direction (arrow A-B direction).

  A first rib 31 is erected in parallel with the side wall 7 so as to connect the light shielding pieces 30 at a portion of the lower case 3 adjacent to the side wall 7 of the bottom plate 5. In the upper part of the first rib 31, a plurality of first grooves 31 a are provided corresponding to the lens holes 9. The first grooves 31 a are opened at the upper side where the light guides 26 of the LED lenses 25 are engaged. Therefore, when each light guide 26 is inserted into the first groove 31a, the LED lens 25 is restricted from moving in the left-right direction (arrow C-D direction).

  A second rib 33 corresponding to each lens hole 9 (corresponding to each first groove 31 a) is provided on the back surface of the upper plate 15 of the upper case 4 in the direction of arrow A, with the surrounding wall 16. They are erected at equal intervals in the direction of arrow CD so as to project in a direction orthogonal to each other. Under the second rib 33, the light guide 26 is engaged in the first groove 31a as shown in FIG. 6, and the connecting body 27 is engaged in the second groove 30b as shown in FIG. The LED lens 25 is engaged with the upper part of the coupling body 27 and the LED lens 25 is moved upward (the light guide 26 is removed from the first groove 31a and the connection body 27 is removed from the second groove 30b). The 1st control part 33a which controls is provided.

  Further, under the second rib 33, the light guide 26 is engaged with the first groove 31a as shown in FIG. 6, and the connector 27 is engaged with the second groove 30b as shown in FIG. A second restricting portion 33b that engages with the rear portion (end portion in the direction of arrow B) of the LED lens 25 connected to the LED lens 25 and restricts the rearward movement of the LED lens 25 is connected to the first restricting portion 33a. Has been.

  Next, a method for assembling the printed circuit board 10 and the LED lens 25 in the electronic apparatus 1 configured as described above will be described. First, the printed circuit board 10 on which the LED 14 is mounted is inclined from the horizontal state, and the end on the arrow A direction side is inserted obliquely from below into the lower part of the contact surface 30a of the light shielding piece 30, and the horizontal state as shown in FIG. By doing so, the end of the printed circuit board 10 on the arrow A direction side is placed on the supporting boss 11A. At the same time, the end of the printed circuit board 10 on the arrow B direction side is inserted into the supporting boss 11B in a state where the hole 10a provided in the printed circuit board 10 is fitted into the small diameter portion 11b of the supporting boss 11B as shown in FIG. Support. In this state, the printed circuit board 10 is positioned and temporarily held in the lower case 3 by the light shielding piece 30 and the supporting bosses 11A and 11B.

  Next, as shown in FIG. 1, the LED lens 25 is held so that the light introduction surface 26 a of the light guide 26 is directed downward, and is inserted into the lower case 3 from the opening 2 of the lower case 3. Next, the lens portions 28 are fitted into the lens holes 9, the light guides 26 are engaged with the first grooves 31 a of the first ribs 31, and the connecting bodies 27 are connected to the second grooves of the light shielding pieces 30. The LED lens 25 is temporarily held in the lower case 3 by engaging with 30b.

  In this state, the hook portion 18 of the upper case 4 is hooked on the hook hooking portion 8 of the lower case 3, and the upper case 4 is rotated around the hook hooking portion 8 as a rotation center. The open ends of the surrounding walls 6 and 16 are brought into contact with each other. Next, as shown in FIG. 1, the screws 21 inserted through the bosses 19 of the upper case 4 are screwed into the coupling bosses 13 of the lower case 3, whereby the openings 2 and 17 are closed and the two cases 3 are closed. , 4 are combined to form a housing of the electronic device 1.

  As shown in FIG. 8, the end of the printed circuit board 10 in the direction of the arrow B is sandwiched between the support boss 11B and the contact boss 20 as shown in FIG. The case 3 is attached to a predetermined position. As described above, the printed circuit board 10 is temporarily held in the lower case 3 in a state, and then the workability is improved by attaching the printed circuit board 10 to the lower case 3 simultaneously with the joining operation of the cases 3 and 4.

  Further, since the cases 3 and 4 are coupled, the first generation portion 33a of the second rib 33 is engaged with the upper portion of the coupling body 27 of the LED lens 25 as shown in FIG. The LED lens 25 is attached to the lower case by restricting the upward movement of the light guide 25 (the removal of the light guide 26 from the first groove 31a and the connection member 27 from the second groove 30b). As described above, the LED lens 25 is temporarily held in the first groove 31a and the second groove 30b, and then attached to the lower case 3 simultaneously with the joining operation of the cases 3 and 4. This improves workability.

  Further, when the cases 3 and 4 are joined, the contact surface 30a of the light shielding piece 30 comes into contact with the surface of the printed circuit board 10, so that the LED lens 25 is adjacent to each other by the light shielding piece 30 as shown in FIG. Since the space between the light guides 26 is shielded, the light emitted from the LEDs 14 mounted on the printed board 10 does not leak to the adjacent LED lens 25.

  DESCRIPTION OF SYMBOLS 3 ... Lower case, 4 ... Upper case, 7 ... Side wall, 10 ... Printed circuit board, 11A, 11B ... Supporting boss, 14 ... LED, 20 ... Contact boss, 25 ... LED lens, 26 ... Light guide, 27 ... Connector, 28 ... Lens part, 30 ... Light shielding piece, 30a ... Contact surface, 30b ... Second groove, 31 ... First rib, 31a ... First groove, 33 ... Second rib, 33a ... First Restriction part, 33b ... 2nd restriction part.

Claims (3)

A lower case having an upper opening and a plurality of lens holes provided on a side wall, an upper case covering the opening of the lower case, a printed circuit board on which a plurality of LEDs are mounted and supported by the lower case, and each LED LED including a plurality of light guides for individually guiding emitted light, a connecting body for connecting the light guides, and an LED lens integrally formed with a lens portion exposed from the lens hole In the lens mounting structure,
Mounting the LED lens, wherein the lower case is integrally provided with a plurality of light shielding pieces positioned between the plurality of light guides and extending to the printed board and contacting the surface of the printed board. Construction. The lower case is provided with a first rib in which each light guide is inserted and a first groove is formed to restrict the movement of the LED lens in the left-right direction;
The light shielding piece is provided with a second groove into which the connecting body is inserted to restrict movement of the LED lens in the front-rear direction,
The upper case is provided with a second rib corresponding to the lens hole provided with a restricting portion that abuts on the connecting body and restricts the LED lens from coming out of the first groove and the second groove. The LED lens mounting structure according to claim 1, wherein: A boss for supporting the printed circuit board is provided on the lower case,
The upper case is provided with a contact boss that contacts the surface of the printed circuit board,
With the one end side of the printed circuit board inserted below the light shielding piece, the lower case and the upper case are joined together so that the other end side of the printed circuit board is brought into contact with the support boss and the contact boss. The LED lens mounting structure according to claim 1, wherein the LED lens is sandwiched between bosses.

Images