JPH0626270U - LED lamp - Google Patents

Abstract

(57) [Summary] [Object] To provide an LED lamp that can be easily assembled, thereby reducing the assembly cost. [Structure] LED 1 mounted on the surface of printed circuit board 11
2 and a transmissive member 13 provided in front of the LED 12, and a part of the light emitted from the LED 12 is transmitted through the transmissive member 1.
After passing through No. 3 and proceeding to the front, the other portion is totally reflected on the surface of the transmissive member 13 and passes through the through hole 11a provided adjacent to the LED of the printed circuit board 11 to proceed to the rear.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to an LED lamp that not only emits light toward the front but also emits light toward the rear at the same time.

[0002]

[Prior art]

 Conventionally, such an LED lamp is configured as shown in FIG. 5, for example. That is, in FIG. 5, the LED lamp 1 includes two printed circuit boards 2 and 3 arranged back to back and at least one LED 4 and 5 mounted on the outer surfaces of the printed circuit boards 2 and 3, respectively. It consists of Each of the LEDs 4 and 5 can be driven to emit light and be turned on by being supplied with power from an external power supply device by an appropriate wiring (not shown).

An LED lamp as shown in FIG. 6 is also known. That is, in FIG. 6, the LED lamp 6 is composed of at least one LED 8 mounted on the front surface and one LED 8 mounted on the back surface of the printed circuit board 7. Also in this case, each of the LEDs 8 and 9 can be driven to emit light by being supplied with power from an external power supply device by an appropriate wiring (not shown) to be turned on.

According to the LED lamps 1 and 6 having such a configuration, the LED 4 or the LED 8 emits light, so that the light is emitted toward the front of the LED lamps 1 and 6, and at the same time, By causing the LED 5 or the LED 9 to emit light, light is emitted toward the rear of the LED lamps 1 and 6.

[0005]

[Problems to be solved by the device]

 However, the LED lamps 1 and 6 having such a configuration have the following problems. That is, since the LED lamp 1 requires the two printed boards 2 and 3, the number of parts is large, and the assembly is complicated and troublesome. Therefore, it takes a long time to assemble the parts, and the parts cost is high. In addition, the assembly cost becomes high, and a large mounting space is required, resulting in a large size.

In addition, for the LED lamp 6, only one printed circuit board 7 needs to be prepared, but since it is necessary to mount the LEDs 8 and 9 on both sides of the one printed circuit board 7, automatic insertion is possible. There is a problem that it is difficult to insert the LEDs 8 and 9 into predetermined positions on both sides of the printed circuit board 7 using a machine and to use the automatic soldering machine. Therefore, it is necessary to use surface mount LEDs for reflow soldering, but in that case, there is a problem that the number of steps increases and the assembly cost increases.

[0007] In view of the above points, the present invention aims to provide an LED lamp that can be easily assembled and thereby reduce the assembly cost, and that can emit light in the front-rear direction. There is.

[0008]

[Means for Solving the Problems]

 In order to achieve the above object, one of the LED lamps according to the present invention includes at least one LED mounted on the surface of a printed circuit board and a transmissive member provided in front of the LED. A part of the light emitted from the light is transmitted through the transmissive member and travels forward, and the other part is totally reflected on the surface of the transmissive member, and a through hole provided adjacent to the LED on the printed circuit board. The feature is that it is designed to move backwards by passing through. In another LED lamp according to the present invention, at least one LED is mounted on the surface of a transparent printed circuit board, and the surface of the printed circuit board opposite to the LED mounting surface is formed as a half mirror surface. It is characterized by that.

[0009]

According to the above configuration, the LED is mounted only on one surface of the printed circuit board, and a part of the light emitted from the LED passes through the transparent member or the transparent printed circuit board and advances forward. The other part is reflected rearward on the surface of the transmissive member or the half mirror surface. Therefore, when mounting the LEDs, it is only necessary to mount the LEDs on one surface of the single printed board, which reduces the number of parts and allows each LED to be mounted on the printed board. Since soldering is performed by a single solder dip process, the number of steps is small and assembly cost is reduced.

Further, in the former configuration, if the transmissive member is provided with a lens portion and a total reflection surface, a part of the light emitted from the LED is collimated through the lens portion, Converged light or divergent light can be guided to the front, and the other part of the light can be reliably guided to the rear by the total reflection surface. If the total reflection surface of the transmission member is a concave reflection surface having a focal point in the through hole, there is an advantage that the diameter of the through hole can be reduced.

[0011]

【Example】

 Hereinafter, the present invention will be described in detail based on the embodiments shown in the drawings. FIG. 1 shows an embodiment of an LED lamp according to the present invention. This LED lamp 10 is made of a single printed circuit board 11, at least one LED 12 mounted on the surface of the printed circuit board 11, and a transparent glass or transparent acrylic plate provided in front of the LED 12. And the member 13.

The transparent member 13 is formed so that a portion immediately before each LED 12 constitutes a lens portion 13a having an elliptical cross section. As a result, the light emitted from each LED 12 and incident on the lens portion 13a passes through the transparent member 13 by the action of the lens portion 13a, becomes parallel light, and travels forward (to the left in the drawing). It is designed to proceed.

Further, the transparent member 13 is formed as an inclined surface (total reflection surface) 13b in which a peripheral portion of the lens portion 13a, that is, a side portion of each LED 12 is inclined. As a result, the light emitted from each LED 12 and incident on the inclined surface 13b is totally reflected by the inclined surface 13b and travels backward, and the through holes provided around the LED 12 on the printed circuit board 11 are provided. It is designed to be irradiated backward through 11a.

The LED lamp 10 according to the present invention is configured as described above, and when the LED 12 is driven to emit light, a part of the light emitted from the LED 12 is the transparent member 13 as shown in FIG. The light enters the lens portion 13a, is refracted by the operation of the lens portion 13a, becomes parallel light, and travels forward from the surface of the transparent member 13. Of the light emitted from the LED 12, the light incident on the slope 13b of the transparent member 13 is totally reflected by the slope 13b and travels backward through the through hole 11a of the printed circuit board 11. Become. Thus, by driving the LED 12 to emit light, the LED lamp 10 reliably emits light in the front-back direction.

If a lens is provided behind each through hole 11a of the printed circuit board 11, the light passing through each through hole 11a is converged or diverged by the lens, so that a desired distribution is obtained. The optical characteristics can be imparted. Further, the light which is transmitted from the lens part 13a through the transparent member 13 and is irradiated forward is not parallel light by changing the surface shape of the lens part 13a or shifting the chip position of the LED 12. It can be light that converges or diverges.

FIG. 3 shows a modification of the LED lamp shown in FIG. In FIG. 3, in the LED lamp 20, the surface around the lens portion 13a of the transparent member 13 is formed as a concave surface 13c. Thereby, the light emitted from the LED 12 and incident on the concave surface 13c can be converged near the through hole 11a of the printed circuit board 11 after being reflected by the concave surface 13c, as shown in FIG. Therefore, even if the through hole 11a is formed to be relatively small, the light can be surely emitted backward through the through hole 11a.

FIG. 4 shows another embodiment of the LED lamp according to the present invention. In FIG. 4, in the LED lamp 30, a printed circuit board 31 is formed of transparent glass or a transparent acrylic plate, and an LED chip 32 is arranged on the rear surface of the transparent printed circuit board 31 and the front surface of the transparent printed circuit board 31. By forming a thin film on the surface, the front surface is formed as a half mirror surface 33.

According to the LED lamp 30 having such a configuration, by driving each LED chip 32 to emit light, the light emitted from each LED chip 32 travels inside the printed board 31 and reaches the front half mirror surface 33. While a part of the light passes through the half mirror surface 33 and moves forward, the other part is reflected by the half mirror surface 33 and moves backward from the rear surface of the print substrate 31. Thus, the LED lamp 30 emits light in the front-back direction.

[0019]

[Effect of device]

 As described above, according to the present invention, the LED is mounted on only one surface of the printed circuit board, and a part of the light emitted from the LED is transmitted through the transparent member or the transparent printed circuit board to the front. While moving forward, the other part is reflected backward by the surface of the transmissive member or the half mirror surface. Therefore, when mounting the LEDs, it is only necessary to mount the LEDs on one surface of the printed circuit board, which reduces the number of parts and allows each LED to be mounted on the printed circuit board once. Since it can be soldered by the solder dipping process, the number of processes is small and the assembly cost is reduced. Thus, according to this invention, it is possible to easily assemble, thereby reducing the assembly cost.

[Brief description of drawings]

FIG. 1 is a schematic side view showing an embodiment of an LED lamp according to the present invention.

FIG. 2 is a partially enlarged sectional view of the LED lamp of FIG.

FIG. 3 is a schematic cross-sectional view showing a modified example of the LED lamp of FIG.

FIG. 4 is a schematic side view showing another embodiment of the LED lamp according to the present invention.

FIG. 5 is a schematic side view showing an example of a conventional LED lamp.

FIG. 6 is a schematic side view showing another example of a conventional LED lamp.

[Explanation of symbols]

 10 LED Lamp 11 Printed Circuit Board 11a Through Hole 12 LED 13 Transparent Member 13a Lens 13b Slope 13c Concave 20 LED Lamp 30 LED Lamp 31 Printed Circuit Board 32 LED Chip 33 Half Mirror

Claims (4)

[Scope of utility model registration request] 1. At least one LED mounted on the surface of a printed circuit board and a transmissive member provided in front of the LED, wherein a part of light emitted from the LED passes through the transmissive member. While passing through to the front, the other part is totally reflected on the surface of the transparent member, and passes through a through hole provided adjacent to the LED of the printed circuit board,
LE, which is characterized in that it is designed to move backward
D lamp. 2. The LE according to claim 1, wherein the transmissive member includes a lens portion and a total reflection surface.
D lamp. 3. The LED lamp according to claim 2, wherein the total reflection surface of the transmission member is a concave reflection surface having a focal point in the through hole. 4. An LED lamp, wherein at least one LED is mounted on a surface of a transparent printed board, and a surface of the printed board opposite to a mounting surface of the LED is formed as a half mirror surface. .