JP2017107671A - LED bulb - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an LED bulb which can emit light by switching color temperature and in which control is simple.SOLUTION: An LED bulb includes: a mounting lock base mounted with respect to a mounting place; a heat radiation member for releasing heat generating during an operation; a first LED unit and a second LED unit which are juxtaposed at a position of a desired light center distance from the mounting lock base and which have different color temperatures; and a lighting control circuit for controlling the lighting of these first LED unit and second LED unit. ON/OFF of lighting of one of the first LED unit and the second LED unit can be controlled, according to whether a voltage applied to the lighting control circuit is a Hi-level or a Lo-level, and according to whether the voltage applied to the lighting control circuit is the Hi-level or the Lo-level only during a predetermined period, switching control can be performed as to which one is lighted out of the first LED unit and the second LED unit.SELECTED DRAWING: Figure 1

Description

  The present invention relates to an LED bulb for exchanging a light source of an in-vehicle light with an LED light source.

  In recent years, bulbs for replacing light sources with LEDs have started to be used for automotive headlamps and fog lamps that use halogen bulbs and HID (high intensity discharge lamps) as light sources. Compared with the conventional light source, there are advantages such as a brightness that can be practically used with power saving, and a long lifetime because of the LED.

  FIG. 6 shows an automotive LED headlamp described in Patent Document 1, and an automotive LED headlamp in which a high-beam LED lamp and a low-beam LED lamp are provided on a heat-dissipating carrier to integrate perspective light. Is described. The automobile LED headlamp 5 shown in FIG. 6 includes an attachment locking base 4 for mounting on an existing automobile headlamp mounting base. One side of the mounting locking base 4 is a light emitting portion, and the other side is It is a heat dissipation part. The light emitting portion includes a heat dissipation carrier 3 and two LED lamps 2, the heat dissipation carrier 3 is fixed to the mounting locking base 4, and the two LED lamps 2 cross over two opposing side surfaces of the heat dissipation carrier 3. One LED lamp 2 is provided at a location relatively far from the mounting lock 4 and is electrically connected to a low beam lamp switch of an automobile, and the other LED lamp 2 is mounted and locked. The two LED lamps 2 are both electrically connected to a switch for a high beam lamp of an automobile. A light shielding panel 1 that blocks flare light is provided at the end of the heat dissipation carrier 3.

FIG. 7 is a diagram showing the LED unit configuration of the headlamp 9 in the vehicle headlamp system described in Patent Document 2, and includes at least one first LED unit having a first color temperature. 6 and at least one second LED unit 7 having a second color temperature different from the first color temperature, a reflective member 8 is provided on the back surface of each of the first LED unit 6 and the second LED unit 7, By changing the luminance ratio between the second LED unit 7 and the first LED unit 6, the light emitted from the second LED unit 7 and the first LED unit 6 is mixed to generate a light beam having a set color temperature. It is characterized by doing.
Utility Model Registration No. 3183658 JP 2013-140724 A

  The LED bulb that has been used in conventional automotive headlamps and fog lights is a light source having a single color temperature (single emission color) as in Patent Document 1, and therefore, the color temperature is changed. For example, a method of replacing the light source LED or mounting a colored glass tube around the LED bulb has been performed. On the other hand, in Patent Document 2, it is possible to change the luminance ratio of the second LED unit 7 and the first LED unit 6 and mix the emitted light to generate a light beam having a set color temperature. However, there is a problem that the light emission control is complicated and the LED bulb becomes expensive.

  The present invention has been made in view of the above problems, and an object of the present invention is to provide an LED bulb that can emit light by switching color temperature and that is simple to control.

  The first aspect of the present invention includes an attachment locking base attached to the attachment portion, a heat radiating member for releasing heat generated during operation, and a desired optical center distance from the attachment locking base in parallel. An LED bulb having a first LED unit and a second LED unit that are arranged at different color temperatures, and a lighting control circuit for controlling lighting of the first LED unit and the second LED unit. The on / off of one of the first LED unit or the second LED unit can be controlled depending on whether the voltage applied to the lighting control circuit is at the Hi level or the Lo level, Depending on whether the voltage applied to the lighting control circuit is at the Hi level or the Lo level for a predetermined period, it is determined whether the first LED unit or the second LED unit is lit. Enable obtaining control and the fact an LED bulb according to claim.

  According to a second aspect of the present invention, there is provided a mounting locking base attached to the mounting portion, a heat radiation member for releasing heat generated during operation, and a position at a desired optical center distance from the mounting locking base. The first LED unit and the second LED unit, each having a different color temperature, arranged at each location, and a lighting control circuit for controlling lighting of the first LED unit and the second LED unit It is an LED bulb, and on / off of lighting of either the first LED unit or the second LED unit is controlled depending on whether the voltage applied to the lighting control circuit is Hi level or Lo level. The first LED unit or the second LED unit is lit depending on whether the voltage applied to the lighting control circuit is at a Hi level or a Lo level for a predetermined period. An LED bulb which is characterized in that whether to allow a control of switching the cause.

  According to a third aspect of the present invention, in addition to the first or second aspect, the lighting control circuit has a memory for storing which of the first LED unit and the second LED unit is lit. Whether the first LED unit or the second LED unit is turned on when the voltage applied to the lighting control circuit satisfies the condition of being at the Hi level or the Lo level for a predetermined period. The LED bulb is characterized in that it is switched and stored in the memory.

  According to the first aspect of the present invention, either the first LED unit or the second LED unit is turned on depending on whether the voltage applied to the lighting control circuit is at the Hi level or the Lo level for a predetermined period. Therefore, it is possible to switch and light two types of LEDs having different color temperatures, and it is possible to simply realize the switching control.

  According to the second aspect of the present invention, either the first LED unit or the second LED unit is turned on depending on whether the voltage applied to the lighting control circuit is at the Hi level or the Lo level for a predetermined period. Therefore, it is possible to switch and light two types of LEDs having different color temperatures, and it is possible to simply realize the switching control.

  According to the invention of claim 3, the lighting control circuit has a memory for storing which of the first LED unit or the second LED unit is lit, and is applied to the lighting control circuit. When the voltage to be applied is at the Hi level or the Lo level for a predetermined period, the first LED unit or the second LED unit is switched on and stored in the memory. Since it did in this way, about the voltage applied to a lighting control circuit, since change of a lighting color can be instruct | indicated only by applying Hi level or Lo level only for a predetermined period, switching control is easy.

FIG. 1A is a schematic diagram showing the LED bulb 10 according to the present invention in Example 1, and FIG. 1B shows a filament 22 from the mounting locking base 21 in the halogen bulb 20. It is the schematic diagram showing LCL which is a distance to. FIG. 2A is a schematic diagram showing the LED bulb 10 according to the present invention in Example 2, and FIG. 2B shows the filament 22 from the mounting locking base 21 in the halogen bulb 20. , 23 is a schematic diagram illustrating LCL1 and LCL2 that are distances up to 23. 3 is a circuit diagram illustrating a configuration of a lighting control circuit 19. FIG. (A) is explanatory drawing showing the electric potential of A point when ON / OFF of the lighting switch 18 is switched, (b) is the electric potential of A point about the signal input when switching a lighting color. It is explanatory drawing showing this. It is a flowchart figure showing the flow of the process in the case of switching lighting color. It is the schematic diagram showing the LED headlamp for motor vehicles in patent document 1. FIG. It is the model showing the LED unit structure of the headlamp 9 in the vehicle headlamp system of patent document 2. FIG.

  The LED bulb according to the present invention is arranged in parallel at a position of a desired optical center distance from the mounting locking base, a mounting locking base that is mounted to the mounting location, a heat radiating member for releasing heat generated during operation, and the mounting locking base. And a lighting control circuit for controlling lighting of the first LED unit and the second LED unit, which are different in color temperature, and a lighting control circuit for controlling lighting of the first LED unit and the second LED unit. The lighting on / off of either the first LED unit or the second LED unit can be controlled depending on whether the voltage applied to the lighting control circuit is at the Hi level or the Lo level, Either the first LED unit or the second LED unit is turned on depending on whether the voltage applied to the lighting control circuit is at the Hi level or the Lo level for a predetermined period. Characterized in that it possible to control to switch the. Details will be described below.

  Embodiments of the present invention will be described with reference to the drawings. FIG. 1A is a schematic diagram showing an LED bulb 10 according to the present invention. The LED bulb 10 shown in FIG. 1A includes a mounting locking base 11 for mounting on a mounting base such as an automotive headlamp, and a desired LCL (Light Center Length: light center distance) from the mounting locking base 11. The distance from the tip of the bulb cap to the center of the light source is a position on the heat dissipating member 14, and a plurality of the first LED units 12 and the second LED units 13 are arranged in parallel. . The first LED unit 12 and the second LED unit 13 are selected to have different color temperatures. As for the distance of the LCL, when an LED bulb is used instead of a halogen bulb having a filament, as shown in FIG. 1B, the distance from the mounting lock base 21 to the filament 22 in the halogen bulb 20 By setting the same distance as the LCL, a desired light distribution pattern can be obtained.

  Further, the LED bulb 10 according to the present invention is provided with a lighting control circuit 19 inside the casing. FIG. 3 is a circuit diagram showing the configuration of the lighting control circuit 19. In FIG. 3, reference numeral 15 denotes an LED constant current drive circuit, which is a circuit for controlling the current flowing through the first LED unit 12 or the second LED unit 13 to be constant and driving it. Reference numeral 16 denotes an MCU (Micro Controller Unit), which is a microcomputer for controlling on / off of the first LED unit 12 and the second LED unit 13, and includes the first LED unit 12 and the second LED unit 12. On / off control is performed by controlling the current value with respect to the bases of the transistors Q1 and Q2 connected to the LED unit 13. Reference numeral 17 denotes a memory for storing the lighting color of the LED, and the MCU 16 lights either the first LED unit 12 or the second LED unit 13 according to the lighting color information stored in the memory 17. To decide. Reference numeral 18 denotes a lighting switch for determining on / off of lighting. As will be described in detail later, control for switching the lighting color is performed based on a signal input to the lighting switch 18.

  Next, the actual operation of the lighting control circuit 19 in FIG. 3 will be described. In FIG. 3, when the lighting switch 18 is turned on / off, the potential change at the point A in FIG. 3 appears in a form of switching between Hi and Lo as shown in FIG. Here, in the MCU 16, the LED is turned on when the potential at the point A is Hi. At this time, which of the first LED unit 12 and the second LED unit 13 is to be lit is determined according to the information on the lighting color stored in the memory 17. For example, when the lighting color of the first LED unit 12 is stored in the memory, the Hi signal is input to the base of the transistor Q1, and the Lo signal is input to the base of the transistor Q2, thereby the first LED The MCU 16 controls so that only the unit 12 is lit.

  Here, the operation when the lighting color is switched will be described. In order to switch the lighting color, as shown in FIG. 4B, a signal including a short Lo period t is input from the lighting switch 18 for the signal input to the point A, that is, the MCU 16. The specific length of t is T1 time which is a sufficient length to prevent erroneous detection that switching of the lighting color is instructed by switch chattering, and is not erroneously detected by switching of a human switch. Therefore, it is set and inputted so that it is T2 time or less which is not too long for necessity. The MCU 16 measures the potential at the point A and the time t of the Lo period, and recognizes that it is a lighting color switching instruction signal when it is determined that T1 ≦ t ≦ T2. The information is switched and stored.

  FIG. 5 is a flowchart showing the flow of processing when the lighting color is switched. In FIG. 5, it is first determined whether or not the potential at point A in FIG. 5 is at the Lo level (S1). When the potential at the point A is at the Hi level, the next processing is not performed until the potential is switched to the Lo level. When it is detected that the potential at the point A has been switched to the Lo level, measurement of the Lo level time t is started (S2). After the measurement is started, it is determined whether or not the potential at point A is switched to the Hi level (S3). When the potential at point A is switched to the Hi level, the measurement of the Lo level time t is terminated (S4). It is determined whether or not the measured Lo level time t satisfies a preset condition T1 ≦ t ≦ T2 (S5). When the Lo level time t does not satisfy the condition, the process proceeds to step (S7). When the Lo level time t satisfies the condition, the lighting color information in the memory 17 is switched and stored (S6), and then the process proceeds to the step (S7). Since the potential at the point A is switched to the Hi level, the lighting color information is read from the memory in order to light the LED (S7). Then, either the transistor Q1 or Q2 is turned on according to the read lighting color information (S8). Thereafter, it is monitored whether the potential at the point A is switched to the Lo level, and the steps from (S1) are repeated.

  As described above, the LED bulb 10 according to the present invention includes the first LED unit 12, the second LED unit 13 having a different color temperature, and the lighting control circuit 19 that controls the lighting of the first LED unit 12, and the lighting control circuit. Necessary to prevent misdetection due to switching of human switch, since it is not less than T1 time that is long enough not to erroneously detect that 19 MCUs 16 have been instructed to switch the lighting color by switch chattering. By inputting a Lo level time t that is not too long, which is less than T2 time, the lighting color can be switched, and LEDs with different color temperatures are switched on with a simple configuration. It is possible to provide an LED bulb that can be used.

  In the first embodiment, as shown in FIG. 1A, the first LED unit 12 and the second LED unit 13 having different lighting colors are arranged in parallel at the same LCL position from the mounting locking base 11. However, the present invention is not limited to this. As shown in FIG. 2A, the first LED unit 12 and the second LED unit 13 having different lighting colors may be arranged at different LCL positions. Regarding the distance of LCL, in the case where an LED bulb is used instead of a halogen bulb having a filament, as shown in FIG. 2 (b), two filaments 22, By setting the same distance as LCL1 and LCL2, which are the respective distances up to 23, a desired light distribution pattern can be obtained.

  As a specific example of such an arrangement, there is a case where a traveling light (high beam) and a passing light (low beam) are switched and used in an LED bulb used for an automobile headlight. An LED with a color temperature of 6000 K for the traveling light (high beam) is arranged at a position close to the mounting locking table 11, and an LED with a color temperature of 3000 K for the passing light (low beam) is arranged at a position far from the mounting locking table 11. As in the case of the first embodiment, the lighting control circuit 19 shown in FIG. 3 controls, and the MCU 16 of the lighting control circuit 19 is not erroneously detected that switching of the lighting color is instructed by switch chattering. A Lo level time t that is a sufficient length T1 time or more and that is T2 time or less that is not too long because it is not erroneously detected by switching of a human switch is input to the traveling light ( It is possible to switch between a high beam and a low beam.

  In the first and second embodiments, the MCU 16 is at least T1 time long enough not to erroneously detect that the MCU 16 has been instructed to switch the lighting color by switch chattering, and the human switch is switched. In order to prevent erroneous detection, the Lo level time t that is T2 time or less that is not too long is input and the lighting color is switched. However, the present invention is not limited to this. The measurement may be performed for and the lighting color may be switched when T1 ≦ Hi level time ≦ T2.

DESCRIPTION OF SYMBOLS 1 ... Light-shielding panel, 2 ... LED lamp, 3 ... Radiation carrier, 4 ... Mounting locking stand, 5 ... Automotive LED headlamp, 6 ... 1st LED unit, 7 ... 2nd LED unit, 8 ... Reflective member, 9 DESCRIPTION OF SYMBOLS: Headlamp, 10 ... LED bulb, 11 ... Mounting lock base, 12 ... First LED unit, 13 ... Second LED unit, 14 ... Heat dissipation member, 15 ... LED constant current drive circuit, 16 ... MCU, DESCRIPTION OF SYMBOLS 17 ... Memory, 18 ... Lighting switch, 19 ... Lighting control circuit, 20 ... Halogen bulb, 21 ... Mounting locking stand, 22 ... Filament, 23 ... Filament

Claims (3)

  A mounting locking base to be attached to the mounting location, a heat radiating member for releasing heat generated during operation, and a color temperature different from each other disposed in parallel at a desired optical center distance from the mounting locking base. An LED bulb comprising one LED unit, a second LED unit, and a lighting control circuit for controlling lighting of the first LED unit and the second LED unit, the lighting control circuit Whether the first LED unit or the second LED unit is turned on or off can be controlled depending on whether the applied voltage is Hi level or Lo level, and is applied to the lighting control circuit. Enables control to switch between lighting of the first LED unit or the second LED unit depending on whether the voltage is at the Hi level or the Lo level for a predetermined period. LED bulb, characterized in that.   A mounting locking base to be attached to the mounting location, a heat radiating member for releasing heat generated during operation, and a color temperature disposed at two positions at a desired optical center distance from the mounting locking base. LED bulbs comprising a first LED unit and a second LED unit different from each other, and a lighting control circuit for controlling lighting of the first LED unit and the second LED unit. Depending on whether the voltage applied to the control circuit is Hi level or Lo level, it is possible to control on / off of lighting of either the first LED unit or the second LED unit, and the lighting control circuit Whether the first LED unit or the second LED unit is lit is switched depending on whether the applied voltage is Hi level or Lo level for a predetermined period. LED bulb, characterized in that the enabling control.   The lighting control circuit has a memory for storing which of the first LED unit or the second LED unit is lit, and the voltage applied to the lighting control circuit is at a Hi level for a predetermined period. When the condition of whether there is a certain level or a low level is satisfied, which one of the first LED unit and the second LED unit is turned on is switched and stored in the memory. The LED bulb according to 1 or 2.

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