JP2005056755A - Display unit for signal display lamp and signal display lamp - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To increase the visibility of a signal display lamp with respect to a signal display lamp for signal information of various states and a display unit for this signal display lamp. <P>SOLUTION: The signal display lamp 1 comprises a cylindrical globe 6, a circuit board 11 arranged at the end part in the axis direction S of the globe 6, a plurality of LEDs 12 supported by the circuit board 11 with the irradiation direction SD of light toward a prescribed part 22 on the inner circumference 6a of the globe 6, and a diffusion lens 13 which transmits the light irradiated from the LEDs 12 in the above irradiation direction SD toward the globe 6 and diffuses it. The exposed part 29 of the outer circumference 6b of the globe 6 is formed in a cylindrical face having no concavo-convex part, thereby suppressing adhesion of dust. The light from the LEDs 12 is diffused by the diffusion lens 13, and the lighted portion of the globe 6 becomes large, thereby increasing the visibility. Diffusion reflection faces 34, 38 which irregularly reflect the light may be used in place of the diffusion lens 13. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  This invention is installed in an automatic machine, a production line, a parking lot, a dangerous place, etc., and a signal indicator lamp for notifying various states such as lack of materials, clogged work, full vehicle, danger, etc. and this signal display The present invention relates to a display unit for lights.

  For example, there is a conventional first signal indicator lamp in which an LED as a light source is disposed in a cylindrical globe. Usually, the directivity of light from the LED is strong. In order to apply such light to signal indicator lamps that are used to draw attention to a wide range of surroundings, signal indicator lamps have a smooth mirror-like reflective surface and an uneven shape formed on the inner periphery of the globe. In other words, the light is reflected by a reflecting surface or diffused by a lens (see, for example, Patent Document 1).

In addition, the conventional second signal indicator lamp includes lenses formed on the inner and outer circumferences of the globe, a light guide that is attached to the globe and transmits light from the light source, and passes through the light guide. Some have an internal reflection surface formed on a light guide that reflects light and a lens formed on the light guide (see, for example, Patent Document 2).
JP-A-7-201210 JP 2000-322901 A

  In the conventional first signal indicator lamp, the light from the LED is not diffused by changing its direction on the reflecting surface until it reaches the globe. As a result, when the glove was viewed from the surroundings, the portion that looked shiny was small and the visibility was insufficient.

  Further, in the conventional second signal indicator lamp, the light from the LED is diffused by the lens, and when the globe is viewed from the surroundings, the portion that appears to shine becomes large. However, the light from the LED is weakened because it passes through the light guide and is internally reflected before reaching the globe. Therefore, the visibility was insufficient. In addition, there is a problem that dust accumulates on the lens on the outer periphery of the globe and the light from the globe is further weakened.

  Accordingly, an object of the present invention is to provide a display unit for a signal indicator lamp that can improve visibility.

  In order to achieve the above object, a display unit for a signal indicator lamp according to a first aspect of the present invention includes a cylindrical globe, a circuit board disposed at one end in the axial direction of the globe, and a light irradiation direction of the globe. An LED supported on a circuit board toward a predetermined portion of the inner periphery, and arranged in the radial direction of the globe away from the inner periphery of the globe and away from the LED, and the light emitted from the LED in the irradiation direction to the globe A diffusing lens unit that transmits and diffuses the light toward the surface.

  According to the present invention, the light from the LED reaches a wider area of the globe by being diffused. As a result, when the globe is viewed from the surroundings, the portion that appears to shine is enlarged. Moreover, the light from the LED can reach the globe with strong light without being reflected in the globe. Therefore, visibility can be improved. Further, since diffusion can be realized by the diffusion lens part in the globe, the conventional lens cut of the globe for diffusion can be simplified or omitted. As a result, the degree of freedom in designing the shape of the globe can be increased. For example, the outer periphery of the globe can be made into a shape without irregularities. In this case, since dust does not easily collect on the outer periphery of the globe, it is possible to suppress a decrease in visibility due to the accumulated dust. Moreover, even if dust adheres, the adhered dust can be easily removed, and maintenance for maintaining visibility is easy. Further, most of at least one of the inner circumference and the outer circumference of the globe can be formed into a shape having no unevenness, more preferably both major parts. In this case, the residual stress at the time of resin molding generated in the globe can be reduced, and the durability of the globe can be enhanced. In addition, the degree of freedom in designing the glove can be increased, and the beauty can be enhanced.

  In a second aspect based on the first aspect, the circuit board is disposed perpendicular to the axis direction of the globe, and the irradiation direction is a direction obliquely intersecting with a direction parallel to the axis line of the globe. The LED lead is bent. According to this invention, the light from the LED provided on the circuit board can be directed to the above-mentioned predetermined portion on the inner periphery of the globe with a simple structure.

  According to a third invention, in the first and second inventions, the LED is adjacent to the inner periphery of the globe, and the inner peripheral portion that is substantially opposite to the axis of the globe is adjacent to the adjacent inner peripheral portion. It is characterized by being arranged with the irradiation direction facing. According to this invention, the predetermined part of the inner periphery of the above-mentioned globe can be arranged far from the LED. Accordingly, the degree of freedom in the layout of the diffusing lens portion can be increased. Moreover, the diffusion distance of the light between LED and the above-mentioned predetermined part can be lengthened. Therefore, visibility can be further improved.

  According to a fourth invention, in any one of the first to third inventions, the diffusing lens portion is formed integrally with a globe. According to the present invention, the number of parts can be reduced, and the assembly cost can be reduced.

  According to a fifth invention, in any one of the first to fourth inventions, the inner circumference of the globe includes a diffusing lens surface that diffuses light traveling from the inner side to the outer side. The diffusion direction is substantially orthogonal to the light diffusion direction by the diffusion lens portion. According to the present invention, the light from the globe can be emitted to a wider area around the globe by the diffusing lens surface. In addition, when the glove is viewed from the surroundings, the portion that appears to be shining can be further widened into a planar shape. Therefore, visibility can be further improved.

  A sixth invention is characterized in that, in the fifth invention, the light diffusing direction by the diffusing lens surface is a direction orthogonal to the axial direction of the globe. According to this invention, since the shape of the diffusion lens surface can be made constant in the axial direction, the structure of the molding die for forming the cylindrical diffusion lens surface can be simplified.

  A display unit for a signal indicator lamp according to a seventh aspect of the present invention includes a cylindrical globe, a circuit board disposed at one end in the axial direction of the globe, an LED supported by the circuit board, and an inner periphery of the globe And diffusing and reflecting means for diffusing the light from the LED toward the globe by irregularly reflecting the light from the LED disposed inward in the radial direction of the globe. According to the present invention, the light from the LED can be diffusely reflected to reach the wide area of the globe evenly, so that the portion of the globe that appears to shine can be enlarged. Therefore, visibility can be improved. Further, since light diffusion can be realized by the diffuse reflection means in the globe, the conventional lens cut of the globe for diffusion can be simplified or omitted. As a result, the degree of freedom in designing the shape of the globe can be increased as in the first invention. As a result, for example, a reduction in visibility due to dust can be suppressed, maintenance is easy, and durability and aesthetics of the glove can be enhanced.

  An eighth invention is characterized in that, in any one of the first to seventh inventions, the globe has an outer periphery formed of a non-diffusing surface substantially free of irregularities. According to this invention, it is difficult for dust to collect on the outer periphery of the globe, so that it is possible to suppress a reduction in visibility due to dust.

  A signal indicator lamp of a ninth invention includes at least one display unit of any one of the first to eighth inventions, and a base unit that houses a power supply unit for supplying power to the LEDs of the display unit. It is characterized by. For example, when a display unit and a base unit having a cylindrical glove have a connecting part for connecting to a corresponding unit and can be stacked on each other in the axial direction of the glove, at least one of the base unit and the base unit. A signal indicator lamp can be obtained by connecting the connecting portions of the stacked units to each other in a state where two display units are stacked in the axial direction of the globe. With this signal indicator lamp, the effects of the first to eighth inventions described above can be exhibited.

  Below, the signal indicator lamp of one Embodiment of this invention is demonstrated in detail with reference to an accompanying drawing. FIG. 1 is a perspective view showing a schematic configuration of a signal indicator lamp according to a first embodiment of the present invention. Please refer to FIG.

  The signal indicator lamp 1 includes a cover 2 arranged at the top of the signal indicator lamp 1 and a plurality of, for example, three display units 3A, 3B, 3C, and a base unit arranged near the base end of the signal indicator lamp 1. 4, and the cover 2, the plurality of display units 3 </ b> A, 3 </ b> B, 3 </ b> C, and the base unit 4 are stacked along the stacking direction and connected to each other and locked together. The base unit 4 includes a power supply unit 4a for supplying power to the LEDs 12 (to be described later) of the display units 3A, 3B, and 3C directly or indirectly connected to the base unit 4 and accommodates the power supply unit 4a. Each unit 3A, 3B, 3C, 4 has a substantially cylindrical shape. In the connected state, the axes S0 of the units 3A, 3B, 3C, and 4 are arranged to coincide with each other, and the axial direction S corresponds to the above-described stacking direction. At the end of the base unit 4, there is provided an attachment member 5 composed of a column for attaching the signal indicator lamp 1 to an attachment location (not shown) (for example, a main body of an automatic machine).

  The display units 3A, 3B, and 3C each emit light to display a signal and are similarly configured. Further, for example, the display unit 3B can be directly connected to the other corresponding display units 3A and 3C and the base unit 4. Similarly, the other units 3A, 3C, 4 can be connected to other corresponding units 3A, 3B, 3C, 4 other than the units 3A, 3C, 4. Below, it demonstrates according to the display unit 3B, and connection is demonstrated according to the relationship with corresponding display unit 3A, 3C.

  FIG. 2 is a cross-sectional view of the display unit 3B.

  The display unit 3B has a glove 6 having a cylindrical shape, for example, a cylindrical shape. The globe 6 has an inner periphery 6a and an outer periphery 6b. Further, the display unit 3B is provided with a first end 7 provided as one end (upper end) in the axial direction S of the globe 6 for mechanical connection to the corresponding display units 3A and 3C. It has the connection part 9 and the 2nd connection part 10 provided in the 2nd end part 8 as the other end (lower end) about the axial direction S of the globe 6.

  Specifically, the first connecting portion 9 is formed on the outer periphery 6 b of the first end portion 7. The outer periphery 6b of the first end portion 7 has a stepped shape reduced in diameter from the large diameter portion 6c. The first connecting portion 9 includes a first fitting portion 9a having an outward cylindrical surface having a smaller diameter than the large diameter portion 6c of the outer periphery 6b, and a large diameter portion 6c of the first fitting portion 9a and the outer periphery 6b. A connecting surface 9b forming an annular step portion and a locking portion 9c formed of a protrusion formed at a predetermined circumferential position of the first fitting portion 9a. The second connecting portion 10 is formed on the inner periphery 6 a of the second end portion 8 of the globe 6. The inner periphery 6a of the second end portion 8 has a stepped shape that is expanded from the small diameter portion 6d. The second connecting portion 10 includes a second fitting portion 10a made of an inwardly cylindrical surface having a larger diameter than the small diameter portion 6d of the inner periphery 6a, and a small diameter portion of the second fitting portion 10a and the inner periphery 6a. 6d, a connecting surface 10b that forms an annular stepped portion, and a locking portion 10c that is a recess formed in a predetermined circumferential position of the second fitting portion 10a.

  The locking portion 10c includes an inlet portion that opens downward at the lower end of the globe 6, a first groove portion that extends upward in the axial direction S from the inlet portion, and a circumferential direction from the inner depth of the first groove portion. A second groove extending.

  For example, in a state in which the first fitting portion 9a of the display unit 3B and the second fitting portion 10a of the display unit 3A are fitted to each other, the locking portion 9c and the locking portion 10c are aligned with each other. The globes 6 of the two display units 3B and 3A are pushed together in the axial direction S. Thereby, the latching | locking part 9c approachs into the back | inner from the entrance of the latching | locking part 10c, and the connection surfaces 9b and 10b of the glove | globe 6 of two display units 3B and 3A mutually contact | abut. In this state, the engaging portions 9c are placed in the second groove portion of the engaging portion 10c by rotating the globes 6 of the two display units 3B and 3A relative to each other along the connecting surfaces 9b and 10b. Enter and engage with its periphery. Thereby, the 1st connection part 9 of this display unit 3B and the 2nd connection part 10 to which the corresponding 2nd edge part 8 of the corresponding unit 3A respond | corresponds can be connected. Similarly, the 2nd connection part 10 of this display unit 3B can be connected with the corresponding 1st connection part 9 of the corresponding 1st edge part 7 of the corresponding unit 3C.

  FIG. 3 is an exploded partial cross-sectional view of the display unit 3B shown in FIG.

  The display unit 3B includes a circuit board 11 disposed at the first end 7 of the globe 6, a plurality of, for example, six LEDs 12 (only part of which are shown) supported by the circuit board 11, and the irradiation direction from the LEDs 12. And a diffusing lens unit 13 that transmits and diffuses the light irradiated to the globe 6.

  The diffusing lens portion 13 is formed separately from the globe 6, is supported by the globe 6 via the circuit board 11, and is disposed farther from the LED 12 and radially inward of the globe 6 than the inner periphery 6 a of the globe 6. .

  In addition, the display unit 3B has a plurality of, for example, six electrical connection members 14 (only part of which are shown) for electrically connecting to the corresponding display units 3A and 3C connected to the display unit 3B.

  The electrical connection member 14 includes a plate member 15 as a first member and a wire 16 as a second member that can be connected to each other. The wire 16 extends between the first and second ends 7 and 8 of the globe 6. The wire 16 is made of a metal member as a conductor and is held in the holding hole 17 of the globe 6. The plate member 15 is formed of a metal member as a conductor and is assembled to the circuit board 11.

  The plate member 15 and the wire 16 are disposed adjacent to each other in the axial direction S of the globe 6 in an electrically connected state and overlapping each other in plan view. The plate member 15 has a first terminal portion 18 made of an elastic tongue piece disposed corresponding to the first end portion 7 of the globe 6. The wire 16 has a second terminal portion 19 disposed corresponding to the second end portion 8 of the globe 6. The display units 3A, 3B, 3C are stacked along the axial direction S and connected to each other by the corresponding first and second connecting portions 9, 10, whereby the first terminal portion 18 of the display unit 3B is The second terminal portion 19 of the corresponding display unit 3A can be elastically connected to the corresponding second terminal portion 19 of the corresponding display unit 3A, and the second terminal portion 19 of the display unit 3B corresponds to the corresponding first terminal portion of the corresponding display unit 3C. The terminal portion 18 can be elastically connected. Through the electrical connection member 14, the circuit boards 11 of the plurality of units 3A, 3B, 3C, 4 of the signal indicator lamp 1 are electrically connected to each other to form a circuit.

  The LED 12, the circuit board 11, the diffusing lens unit 13, and the electrical connection member 14 are accommodated in the globe 6.

  The globe 6 protects components such as the circuit board 11, the LED 12, and the diffusing lens portion 13 disposed inside the display unit 3B, and forms the outer shape of the display unit 3B and constitutes an appearance with a design. it can. The globe 6 is formed of a light-transmitting synthetic resin such as methacrylic resin. The globe 6 may be colored in the same color as the light from the LED 12, or may be colored in a color different from the color of the light from the LED 12. The globe 6 may be colored red, blue, yellow, or the like, or may be colorless and transparent.

  A circuit board 11 is held on the first end 7 which is the upper end of the globe 6. Specifically, the circuit board 11 is received by a plurality of bosses 20 (only a part of which is shown) as receiving parts of the first end 7 of the globe 6. By screwing a fixing screw 21 inserted through the circuit board 11 into a screw hole (not shown) provided in the boss 20, the circuit board 11 is fixed to the globe 6, and the plate surface of the circuit board 11 is set in the axial direction of the globe 6. S is arranged orthogonal to S.

  The circuit board 11 is formed in a disc shape. The circuit board 11 holds the above-described LED 12, a plurality of circuit components (not shown), the plate member 15 of the electrical connection member 14, and the diffusing lens portion 13. The circuit board 11, the LED 12, the circuit component, and the plate member 15 are electrically connected to each other.

  Referring to FIG. 2, LED 12 includes a light emitting diode element (not shown) and a pair of leads 12a (only a part is shown) for supplying power to the element. Each lead 12a is made of a metal terminal member, is led out from a resin member for molding the light emitting diode element, and is fixed to the circuit board 11 by soldering.

  The LED 12 is on the upper side of the central portion in the axial direction S of the globe 6 and is disposed on the lower surface of the circuit board 11.

  The lead 12a of the LED 12 is bent, and the irradiation direction SD of the light from the LED 12 is set to be obliquely intersected with a direction parallel to the axis S0 of the globe 6, for example, obliquely downward. Thereby, when looking up at the signal indicator lamp 1 from below, the visibility of the display unit 3B can be increased. The irradiation direction SD described above corresponds to the direction of the strongest light from the LED 12, for example.

  The light irradiation direction SD of the LED 12 is directed to the predetermined portion 22 on the inner periphery 6 a of the globe 6. Here, the predetermined portion 22 of the inner periphery 6a corresponds to a part of the inner periphery side of the display portion that is a portion that is visible when viewed from the periphery of the globe 6, for example, in the central portion in the axial direction S. It is a part opposite to the LED 12 in the radial direction.

  4 is a bottom view of the display unit 3B shown in FIG.

  When viewed from the axial direction S, the plurality of LEDs 12 and the plurality of electrical connection members 14 are arranged alternately and evenly in the circumferential direction T, are spaced apart from each other, and are disposed close to the inner periphery 6 a of the globe 6. The The electrical connection member 14 is disposed at a position that does not block light emitted along the radial direction of the globe 6 from the LED 12 on the opposite side of the radial direction of the globe 6.

  Please refer to FIG. 2 and FIG. The diffusing lens portion 13 is locked along the lower surface portion of the circuit board 11 and is held by the globe 6 through the circuit board 11.

  The diffusing lens portion 13 has a plurality of, for example, two elastic collar portions 23 as locking portions for locking to the circuit board 11. Correspondingly, a plurality of, for example, two engagement holes 24 are provided in the circuit board 11 as locking portions capable of locking the elastic flange portion 23. When the elastic flange portion 23 is elastically engaged with the engagement hole 24 in the inserted state, the diffusing lens portion 13 is locked to the circuit board 11 in a retaining state.

  The diffusing lens portion 13 is made of a light-transmitting synthetic resin such as methacrylic resin and is colorless and transparent. The diffusing lens unit 13 is formed in a rotating body shape rotated around the axis S0 of the globe 6, for example, a hollow truncated cone shape. The diffusing lens portion 13 is formed such that the upper side of the LED 12 in the axial direction S has a relatively large diameter, and has an inner periphery 13 a and an outer periphery 13 b that are inclined with respect to the axial direction S.

  The inner periphery 13a of the diffusing lens portion 13 has, in the circumferential direction T, a large number of concave surface portions 25 (only part of which are shown) made of concave stripes extending along the direction in which the generatrix of the truncated cone as a lens cut extends. Lined up. The concave portion 25 has a concave curved surface shape in cross section and extends along a virtual plane including the axis S0 and the radial direction of the globe 6. Therefore, the light diffusing direction D1 (see FIG. 4) by the inner periphery 13a of the diffusing lens portion 13 is the circumferential direction T, and the light transmitted from the inner side to the outer side in the radial direction is directed to a wider range in the circumferential direction T. I try to diffuse.

  The outer periphery 13b of the diffusing lens portion 13 is formed by arranging a number of convex surface portions 26 (only part of which are shown in the drawing) extending in the circumferential direction T as lens cuts in the axial direction S along the generatrix of the truncated cone. Therefore, the diffusing direction D2 of the outer periphery 13b of the diffusing lens portion 13 is the axial direction S, and the light transmitted from the inner side to the outer side in the radial direction is diffused toward a wider range in the axial direction S.

  The inner circumference 6a of the globe 6 includes a diffusing lens surface 27 that diffuses the light from the diffusing lens portion 13 when transmitting the light from the inside in the radial direction to the outside.

  The diffusing lens surface 27 is formed over the entire circumference at an intermediate portion of the inner periphery 6a corresponding to the diffusing lens portion 13 with respect to the axial direction S, which is a portion that is substantially in the same position. The diffusing lens surface 27 is formed by arranging a number of concave surface portions 28 made of concave stripes extending in the axial direction S as lens cuts along the circumferential direction T (see FIG. 4). Accordingly, the light diffusion direction D3 (see FIG. 4) by the diffusion lens surface 27 is the circumferential direction T, and the light traveling in the radial direction from the inside of the globe 6 is diffused toward a wider range in the circumferential direction T.

  The outer periphery 6b of the globe 6 includes an exposed portion 29 exposed to the outside. The exposed part 29 is formed in the intermediate part and lower end part of the outer periphery 6b about the axial direction S except for the first fitting part 9a. The exposed portion 29 is a smooth cylindrical surface made of a non-diffusion surface without unevenness. Most of the exposed portion 29 constitutes the display portion described above.

  In this display unit 3B, the light from the LED 12 is irradiated toward the center of the globe 6, passes through the diffuser lens portion 13 on the opposite side across the center, passes through the predetermined portion 22 of the globe 6, and surrounds it. To be emitted. The light from the LED 12 is diffused in the circumferential direction T when entering the inner periphery 13 a of the diffusion lens unit 13, diffused in the axial direction S when exiting from the outer periphery 13 b of the diffusion lens unit 13, and When the light enters the diffusing lens surface 27 on the inner circumference 6a, it is further diffused in the circumferential direction T.

  Thus, in the present embodiment, the light from the LED 12 is diffused by the diffusing lens unit 13 and reaches a wider area of the globe 6. As a result, when the globe 6 is viewed from the periphery, the portion that appears to shine is enlarged. Moreover, the light from the LED 12 can reach the globe 6 with strong light without being reflected in the globe 6. Therefore, visibility can be improved.

  Moreover, since the light from the LED 12 can reach the globe 6 directly, it is not necessary to provide a conventional reflecting surface inside the globe 6.

  Since diffusion can be realized by the diffusion lens portion 13 in the globe 6, the conventional lens cut of the globe for diffusion can be simplified or omitted. As a result, the design freedom of the shape of the globe 6 can be increased.

  For example, in the present embodiment, the entire exposed portion 29 of the outer periphery 6b of the globe 6 is formed into a shape having no irregularities, and this makes it difficult for dust to collect on the outer periphery 6b of the globe 6, so that the visibility due to dust is reduced. Moreover, even if dust adheres, the attached dust can be easily removed. Therefore, maintenance for maintaining visibility is easy. In addition, since the diffusion of light from the LED can be realized by the diffusing lens portion 13 provided in the globe 6, most of the outer periphery 6 b of the globe 6 has a shape without irregularities. In this case, the globe 6 Moreover, the residual stress at the time of resin molding can be reduced, the strength of the globe 6 can be increased, and the durability thereof can be increased. Moreover, since the design freedom of the shape of the globe 6 is high as described above, the design freedom of the globe 6 can be increased and the aesthetic appearance can be enhanced.

  By bending the lead 12a of the LED 12, the light from the LED 12 provided on the circuit board 11 can be directed to the predetermined portion 22 on the inner periphery 6a of the globe 6 with a simple structure.

  The LED 12 is disposed close to the inner periphery 6 a of the globe 6, and is disposed with the irradiation direction SD directed to an inner periphery that is substantially opposite to the axis S <b> 0 of the globe 6 from the adjacent inner periphery. For example, the LED 12 illustrated on the upper right side of FIG. 4 is close to the portion 30 of the inner periphery 6a, and the predetermined portion 22 as the corresponding inner peripheral portion on the opposite side is illustrated on the lower left side of FIG. Thereby, the predetermined part 22 of the inner periphery 6 a of the globe 6 described above can be arranged far from the LED 12. Therefore, the degree of freedom in the layout of the diffusing lens unit 13 can be increased. Moreover, the diffusion distance of the light between LED12 and the predetermined part 22 can be lengthened. Therefore, visibility can be further improved.

  By forming the diffusing lens portion 13 separately from the globe 6, the degree of freedom in designing the globe 6 and the diffusing lens portion 13 can be further increased.

  Furthermore, the diffusion lens unit 13 can have a higher degree of design freedom for diffusing than the globe 6. At the same time, since the conventional reflecting surface in the globe is omitted, the degree of freedom in designing the diffusing lens unit 13 can be further increased. Therefore, for example, the light can be diffused to a wider area of the globe 6 by the diffusion lens unit 13. In addition, the shape and arrangement of the lens cuts on the inner periphery 13a and the outer periphery 13b of the diffusing lens unit 13 can be set as appropriate to vary the effects of light such as how the light from the display unit is visible and how easy it is to see. In addition, the light diffusing function of the globe 6 can be simplified or omitted, and the appearance of the globe 6 can be kept unchanged.

  Furthermore, it is more preferable that both the inner periphery 13a and the outer periphery 13b of the diffusion lens portion 13 are subjected to a diffusion lens cut in order to increase the degree of freedom in design.

  The light diffusing direction D2 by the outer periphery 13b of the diffusing lens portion 13, for example, the axial direction S, and the light diffusing direction D1, for example, the circumferential direction T by the inner periphery 13a of the diffusing lens portion 13, are orthogonal to each other. Can reach the wider area of the globe 6 and the visibility can be further enhanced.

  The light diffusion direction D3 by the diffusion lens surface 27 of the inner periphery 6a of the globe 6, for example, the axial direction S is orthogonal to the light diffusion direction D2 by the outer periphery 13b of the diffusion lens unit 13, for example, the circumferential direction T. Thereby, the light from the globe 6 can be emitted to a wider area around the globe 6. Moreover, when the globe 6 is viewed from the periphery, the portion that appears to be shining can be further widened into a planar shape. Therefore, visibility can be further improved. The light diffusing direction D3 by the diffusing lens surface 27 may be orthogonal to the light diffusing direction D1 by the inner periphery 13a of the diffusing lens portion 13. In this case, the same effect can be obtained. . Further, when the light diffusion direction D3 by the diffusion lens surface 27 is substantially orthogonal to the light diffusion directions D1 and D2 by at least one of the inner circumference 13a and the outer circumference 13b of the diffusion lens portion 13, substantially the same effect is obtained. be able to.

  However, if the light diffusing direction D3 by the diffusing lens surface 27 of the globe 6 is the circumferential direction T and is orthogonal to the axial direction S of the globe 6, the shape of the diffusing lens surface 27 is a certain shape with respect to the axial direction S. Therefore, the structure of the molding die for molding the cylindrical diffusing lens surface 27 can be simplified.

  Moreover, since only the diffusing lens portion 13 is provided in the optical path between the LED 12 and the inner periphery 6a of the globe 6, it is possible to suppress an increase in the number of parts, and hence cost and mass. When the increase in mass can be suppressed, it is difficult for the signal indicator lamp 1 to resonate when subjected to vibration, and a highly durable signal indicator lamp when subjected to vibration can be realized.

  Further, if the signal indicator lamp 1 includes the base unit 4 and at least one of the display units 3A, 3B, 3C, the effect of the display unit 3B can be exhibited in the same manner.

  Next, a second embodiment of the present invention will be described. In the following description, differences from the above-described embodiment will be mainly described, and the description of the same configuration will be omitted and the same reference numerals will be given. The same applies to other embodiments and modifications described later.

  FIG. 5 is a cross-sectional view of a display unit 3D according to the second embodiment of the present invention. In the display unit 3D of the second embodiment, the diffusing lens unit 13 and the globe 6 are integrally formed instead of the diffusing lens unit 13 and the globe 6 formed separately from each other in the first embodiment. An integrally molded product 31 is formed. In this respect, the display unit 3D is different from the display unit 3B.

  The integrally molded product 31 includes the above-described diffusing lens portion 13, the above-described globe 6, and a connection portion 32 that connects the globe 6 and the diffusing lens portion 13 to each other. The connecting portion 32 connects the inner periphery 6 a of the first end 7 of the globe 6 and the outer periphery 13 b of the large diameter portion of the diffusing lens portion 13 to each other. Further, an annular space 33 is provided between the globe 6 and the diffusing lens portion 13 for placing a molding die when the integrally molded product 31 is molded.

  Since the diffusing lens portion 13 is formed integrally with the globe 6, the number of parts can be reduced, and the assembly cost can be reduced.

  FIG. 6 is a partial cross-sectional view of a display unit 3E according to the third embodiment of the present invention. FIG. 7 is an enlarged cross-sectional view of a main part of the display unit 3E shown in FIG.

  A display unit 3E according to the third embodiment includes a diffuse reflection surface 34 as a diffuse reflection means that diffuses light by irregularly reflecting light from the LED 12 instead of the above-described diffusion lens unit 13. Accordingly, the light irradiation direction SD by the LED 12 is a direction toward the diffuse reflection surface 34, for example, a direction parallel to the axial direction S and directed downward. In this respect, the display unit 3E is different from the display unit 3B.

  The diffuse reflection surface 34 is disposed radially inward of the globe 6 with respect to the inner periphery 6a of the globe 6, has a truncated cone shape, and is supported by a carrier 35 that is fixed to the circuit board 11 by a locking portion 35a. ing. The diffuse reflection surface 34 is formed such that the lower end portion on the side farther from the LED 12 is larger in diameter than the upper end portion, receives light from the LED 12 irradiated from above along the axial direction S, and generally has a shape of the globe 6. The light is reflected outward in the radial direction, which is the direction toward the predetermined portion 22.

  The diffuse reflection surface 34 includes a large number of concave portions 36 having a so-called dimple shape, and the concave portion 36 is formed of a concave curved surface such as a hemispherical shape. The light diffusion direction D4 by the diffuse reflection surface 34 includes the axial direction S and the circumferential direction T, receives light from the LED 12, and diffuses and reflects the light in multiple directions.

  The diffuse reflection surface 34 diffuses the light from the LED 12 so that it can reach the wide area of the inner periphery 6a of the globe 6 uniformly. Can be spread in a planar shape. Further, since light can be diffused by irregular reflection, other configurations for diffusing, for example, the diffusing lens portion 13 of the first and second embodiments, the diffusing lens surface 27 of the globe 6, and the diffusing lens on the outer periphery of the conventional globe are used. Cuts and the like can be simplified or omitted. As a result, light can be maintained strongly and visibility can be enhanced.

  Moreover, since the diffusion of light can be realized by the diffuse reflection surface 34 in the globe 6, the conventional lens cut of the globe for diffusion can be simplified or omitted. As a result, the design freedom of the shape of the globe 6 can be increased as in the first embodiment. Therefore, for example, a reduction in visibility due to dust can be suppressed, maintenance is easy, and durability and aesthetics of the globe 6 can be enhanced.

  Further, the diffusion lens surface 27 on the inner periphery 6a of the globe 6 can further promote the diffusion of light by the diffuse reflection surface 34, and can further improve the visibility.

  Instead of the diffuse reflection surface 34 having a large number of recesses 36 in the third embodiment, a diffuse reflection surface 38 (see FIG. 8) having a large number of minute irregularities 37 may be provided. The diffuse reflection surface 38 can diffuse and diffuse light in multiple directions in the same manner as the diffuse reflection surface 34.

  Although three embodiments of the present invention have been described above, the present invention can be implemented in other forms. For example, in the first and second embodiments, a hollow cone shape, a hollow hemispherical shape, and the like are also conceivable as the rotating body shape of the diffusion lens unit 13. It is also conceivable to hold the LED 12 with respect to the circuit board 11 and connect it to the circuit board 11 without bending the lead 12 a of the LED 12. It is also conceivable to irradiate the LED 12 toward the predetermined portion 22 of the globe 6 on the side close thereto.

  In each of the above-described embodiments, the structure of the mold for molding the globe 6 is complicated, but the light diffusion direction D3 of the diffusion lens surface 27 on the inner periphery 6a of the globe 6 is changed to the axial direction S or the axial direction S. It can also be considered that the direction is diagonal.

  As the exposed portion 29 in each of the above-described embodiments, a curved surface having a slight undulation along the axial direction S such as a barrel shape or a drum shape may be used in addition to the cylindrical surface, or the cross-sectional shape cutting the axial direction S may be uneven. A square tube surface such as a polygonal shape may be used, and the effect can be obtained in the same manner as a surface without unevenness as long as it is a surface without substantially unevenness.

  Further, most of the exposed portion 29 of the outer periphery 6b of the globe 6 can be formed into a shape without unevenness, and unevenness can be formed in a part of the exposed portion 29. In this case as well, the entire exposed portion 29 has no unevenness. As in the case of forming the shape, it is possible to obtain an effect of suppressing a decrease in visibility due to dust.

  In the above-described embodiment, the outer periphery 6b of the globe 6 has a shape without unevenness. However, since the diffusion of light from the LED can be realized by the diffusion lens portion 13 provided in the globe 6, the inner periphery 6a of the globe 6 can be realized. And most of at least one of the outer periphery 6b, more preferably, most of both can be formed into an uneven shape. For example, the diffuser lens surface 27 is replaced with the inner periphery 6a of the globe 6 of the above-described embodiment. Thus, a non-diffusion surface substantially free of unevenness may be formed. In this case, the durability of the globe 6 can be increased as in the case where the outer periphery 6b has a shape without irregularities. In addition, various design changes can be made within the scope of matters described in the claims.

It is a perspective view of schematic structure of the signal indicator lamp of a 1st embodiment of the present invention. It is sectional drawing of the display unit shown in FIG. 1, and shows the II-II cross section shown in FIG. FIG. 3 is a partial cross-sectional exploded view of the display unit shown in FIG. 2. FIG. 3 is a bottom view of the display unit shown in FIG. 2. It is sectional drawing of the display unit of 2nd Embodiment of this invention, and shows the cross section equivalent to the cross section of FIG. It is a partial cross section figure of the display unit of 3rd Embodiment of this invention. It is a principal part expanded sectional view of the diffuse reflection surface of FIG. It is a principal part expanded sectional view of the modification of the diffuse reflection surface of FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Signal indicator lamp 3A, 3B, 3C, 3D, 3E Display unit 4 Base unit 4a Power feeding part 6 Globe 6a Inner circumference of glove 7 1st edge part (one end of the globe about an axial direction)
9 1st connection part 10 2nd connection part 11 Circuit board 12 LED
12a LED lead 13 Diffuse lens part 22 Predetermined part of the inner circumference of the globe (inner circumference part on the opposite side)
27 Diffuse lens surface 29 Exposed part (the outer periphery of the globe substantially without irregularities)
30 Inner peripheral part of globe where LED is close 34,38 Diffuse reflection surface (diffuse reflection means)
D2 Light diffusing direction by the outer periphery of the diffusing lens part D3 Light diffusing direction by the diffusing lens surface S Globe axial direction S0 Globe axis SD Light irradiation direction T Circumferential direction (direction orthogonal to the glove axial direction)

Claims (9)

A tubular glove,
A circuit board disposed at one end in the axial direction of the globe;
An LED supported on the circuit board with the light irradiation direction directed to a predetermined part of the inner periphery of the globe,
A diffusing lens unit that is disposed away from the LED and radially inward of the globe than the inner periphery of the globe, and transmits and diffuses the light emitted from the LED in the irradiation direction toward the globe. Display unit for signal indicator.   2. The display unit for a signal indicator lamp according to claim 1, wherein the circuit board is disposed orthogonally to an axis direction of the globe, and the irradiation direction is a direction obliquely intersecting a direction parallel to the axis of the globe. Thus, the display unit for the signal indicator lamp, wherein the lead of the LED is bent.   The display unit for a signal indicator lamp according to claim 1 or 2, wherein the LED is adjacent to an inner periphery of the globe, and an inner peripheral portion that is substantially opposite to an axis of the globe is adjacent to the adjacent inner periphery. A display unit for a signal indicator lamp, wherein the display unit is arranged with an irradiation direction directed to a peripheral portion.   4. The signal display lamp display unit according to claim 1, wherein the diffusing lens portion is formed integrally with a globe.   5. The display unit for a signal indicator lamp according to claim 1, wherein the inner periphery of the globe includes a diffusion lens surface that diffuses light traveling from the inside to the outside, and the diffusion lens surface. The display unit for a signal indicator lamp, wherein the light diffusing direction is substantially orthogonal to the light diffusing direction of the diffusing lens unit.   6. The display unit for a signal indicator lamp according to claim 5, wherein a light diffusing direction by the diffusing lens surface is a direction orthogonal to an axis direction of the globe. A tubular glove,
A circuit board disposed at one end in the axial direction of the globe;
LEDs supported on this circuit board;
A signal display comprising: diffuse reflection means arranged to be radially inward of the globe from the inner periphery of the globe and diffusing the light from the LED toward the globe by irregularly reflecting the light from the LED Display unit for lights.   8. A signal display lamp display unit according to claim 1, wherein the globe has an outer periphery formed of a non-diffusing surface substantially free of irregularities. .   A signal indicator lamp comprising: at least one display unit according to any one of claims 1 to 8; and a base unit that houses a power feeding unit for feeding power to an LED of the display unit.

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