JP2603866B2 - Power supply - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a power supply device suitable for use in a vehicle lamp that warns a following vehicle when a brake is operated.

[Conventional technology]

In a recent automobile, as shown in FIG.
A stop lamp 3 is installed in the rear protruding end of the rear spoiler 2 provided on the rear upper surface of the rear spoiler, and the stop lamp 3 is turned on together with the brake light at the time of a brake operation to further alert a driver of a following vehicle and prevent a rear-end collision and the like. (Japanese Utility Model Application Laid-Open No. 61-190779, 61-1907)
No. 80).

In such a vehicle lamp, generally, the stop lamp 3 which is turned on in response to the operation of turning on the brake is turned off immediately in response to the operation of turning off the brake. For this reason, the visual recognition effect for the driver of the following vehicle becomes monotonous when changing to the brake off operation.

In order to overcome such monotony, for example, by incorporating a control circuit in the stop lamp 3, the stop lamp 3
Can be turned off gradually.

[Problems to be solved by the invention]

However, when such a method is adopted, if the power from the vehicle-mounted battery is always supplied to the stop lamp 3 and the control circuit is made to stand by in a wake-up state, wasteful power is consumed by the control circuit. In addition to the consumption, the stop lamp 3 may be erroneously lit due to malfunction of the control circuit due to noise or the like.

[Means for solving the problem]

SUMMARY OF THE INVENTION The present invention has been made to solve such a problem, and a display circuit comprising a large number of light emitting diodes and constantly receiving a power supply voltage (+ B) from a vehicle-mounted battery, and a power supply to the display circuit A power supply unit that generates a constant voltage (+ V _B ) by using the voltage (+ B) as a branch input, and receives all the constant voltage (+ V _B ) effectively supplied from the power supply unit to turn on all the light emitting diodes in the display circuit. A control unit that gradually turns off all light-emitting diodes in the display circuit in response to a mode signal that disappears due to the operation of turning off the brake, and the power supply unit includes:
A power supply validating means for validating the supply of a constant voltage (+ V _B ) to the control unit in response to a mode signal generated by turning on the brake, and a mode signal received in response to a mode signal disappearing by turning off the brake. A power supply invalidating means for invalidating the supply of the constant voltage (+ V _B ) to the control unit after waiting for a predetermined time until at least the light emitting diodes in the display circuit are completely turned off after the disappearance of the signal. is there.

[Action]

Therefore, according to the present invention, when the brake is turned on, the constant voltage (+ V _B ) is effectively supplied from the power supply unit to the controller unit. Thereby, the controller unit turns on all the light emitting diodes in the display circuit.
When the brake is turned off, the controller gradually turns off all the light-emitting diodes in the display circuit. Then, after the light emitting diodes are completely turned off in the display circuit, the supply of the constant voltage (+ V _B ) from the power supply unit to the control unit is cut off.

〔Example〕

Hereinafter, the power supply device according to the present invention will be described in detail.
FIG. 2 is a main part front view showing a state in which a high-mount stop lamp (hereinafter simply referred to as a stop lamp) to which one embodiment of the power supply device is applied is incorporated in a rear spoiler, and FIG. 2 is a sectional view taken along line AA in FIG.
FIG. 4 is a sectional view taken along line BB in FIG. 2, and FIG.
FIG. 6 is a sectional view taken along the line CC in FIG.
7 is a sectional view taken along the line EE in FIG. 2, FIG. 8 is a sectional view taken along the line FF in FIG. 2, FIG. 9 is an enlarged perspective view of the light control unit, FIG. The figure shows GG in FIG.
FIG. 11 is a sectional view taken along line HH in FIG.

2 to 8, the structure of the rear spoiler and the stop lamp will be described.
Figure), 11 is a left and right wing-shaped rear spoiler as a mounting body installed via a gasket 12 on the rear upper surface 10 of the vehicle body, and 13 is provided on the lower surface of the rear projecting end of the rear spoiler 11 in the longitudinal center And a stop lamp on a strip extending in the left-right direction provided in the elongated cutout 14 having a predetermined length. The stop lamp 13 has a plate-shaped lamp body 15 and a substantially U-shaped vertical cross-section, and is open to the front of the vehicle body. A lamp unit 17 including a front lens 16 fixed by the above-mentioned, and inside the lamp unit, printed circuit boards 18-1 and 18-2 on which a large number of light emitting diodes 19 are mounted, and which will be described in more detail later. A control board 100 is provided.

As shown in FIGS. 3 and 6, a plurality of fixing pieces 20 are integrally provided on the back of the lamp body 15 toward the front of the vehicle body. Are firmly fixed by bolts 21 and nuts 22.
Further, the upper surface of the front lens 16 is also fixed to the ceiling surface of the cutout recess 14 with a double-sided adhesive tape 23 (FIG. 6), an adhesive or the like. A communication hole 24 and a communication pipe 25 (FIGS. 3 and 7) for connecting the inside of the lamp unit 17 and the inside of the rear spoiler 11 are provided at appropriate places on the back of the lamp body 15, and the communication pipe 25 is provided in front of the vehicle body. The front end is bent downward to prevent intrusion of rainwater or the like. Since the inside of the lamp unit 17 communicates with the outside through the communication pipe 25, air can flow freely, and the temperature and humidity are made substantially equal to the outside. Therefore,
The occurrence of water droplets due to the blinking of the light emitting diode 19 and the fluctuation of temperature and pressure are prevented from being reduced. A filter 26 (FIGS. 3 and 7) is provided at the inner open end of the communication pipe 25, that is, the communication hole 24. The filter 26 is made of a fluorine-based material.
It has high air permeability by being formed of a porous film of polyethylene, ultra-high molecular polyethylene, acrylic, or the like. Therefore, the circulation of air is free. However, it has waterproofness by preventing the passage of water.

A cord lead-out hole 29 (FIGS. 3 and 4) for guiding the cord 28 into the rear spoiler 11 is opened in the longitudinal center portion of the lamp body 15, and the cord lead-out hole 29 has a rubber bushing 30. Are fitted and fixed. One end of the cord 28 is connected to the electric circuit of the control board 100, and the other end passes through the inside of the rear spoiler 11 and is provided with an insertion hole 32 formed in the rear upper surface 10 of the vehicle body.
(FIG. 4). A plurality of board mounting portions 33 (FIGS. 3 and 5) are integrally provided on the front surface of the lamp body 15 to project forward, and printed circuit boards 18-1 and 18-2 are provided on the front end surfaces thereof. It is fixed vertically by a set screw 34. The light emitting diode 19 is a printed circuit board 18-1, 18-
The optical axis 47 (FIG. 4) is substantially vertical and substantially parallel to the center axis L (FIG. 3) of the vehicle body in the left-right direction. . In this embodiment, each of the printed circuit boards 18-1 and 18-2 has 24 pieces,
A total of 48 light emitting diodes 19 are arranged. The printed boards 18-1 and 18-2 are electrically connected to each other, and the control board 100 is electrically and mechanically attached to the printed board 18-1.

The front lens 16 has a rectangular box shape long in the left-right direction made of a translucent resin colored red, yellow or the like, and its inner surface, that is, the surface 40 facing the light emitting diode 19 is shown in FIGS.
As shown in the figure, the lower end is inclined with an appropriate curvature and is continuous with the bottom surface 41 while being inclined toward the rear side of the vehicle body. Also, the inner surface 40
A light control unit 43 is formed at the upper end of the light emitting diode corresponding to each light emitting diode 19, and a side step 44 (FIG. 9) is formed at the lower end.

The light control unit 43 improves the visibility of the stop lamp 13 from the rear of the vehicle body by guiding the light emitted from the corresponding light emitting diode 19 to the rear of the vehicle body, as shown in FIGS. A total of nine prism groups 45A, each having a rectangular shape of approximately the same size, arranged vertically and horizontally in three rows of three each
45I, and the center of the prism 45E located at the center substantially coincides with the center of the corresponding light emitting diode 19. The central prism 45E is formed in a concave curved shape with an appropriate curvature (R ₁ ) as shown in FIGS. Four prisms 4 located above, below, right and left of the central prism 45E
5B, 45D, 45F, and 45H each have a step portion 46 whose inner end, that is, a side end in contact with the central prism 45E is slightly protruded from the prism 45E, and extends from the inner end side to the outer end side. It is formed to be thin. Therefore, the two right and left prisms 45B and 45H are substantially triangular in cross section as shown in FIG. 10, and the two upper and lower prisms 45D and 45F are substantially triangular in vertical cross section as shown in FIG. Thus, the height of the step 46 of the lower prism 45F is set to be larger than that of the upper prism 45D. The height of the step 46 of the two right and left prisms 45B and 45H is higher than that of the upper prism 45D and lower than the step of the lower prism 45F, as appropriately shown in FIG. The surfaces of the four prisms 45B, 45D, 45F, and 45H are formed into concave curved surfaces with an appropriate curvature (R ₂ ).

Four prisms 45A, 45C, 45G, 45I located at the four corners
As shown in FIG. 9, a step portion 48 is formed by projecting so as to be one step higher than the four prisms 45B, 45D, 45F, and 45H, and the surface 49 has an inner corner portion in contact with the central prism 45E. From 50, it is formed in a concave curved surface with an appropriate curvature so as to incline toward the corner 51 at the diagonal position. Accordingly, the plate pressure of the four prisms 45A, 45C, 45G, and 45I is maximum at the inner corner 50 and minimum at the outer corner 51, and the vertical and horizontal cross-sectional shapes are substantially triangular.
Here, h is the reference thickness of the front lens 16.

Such prisms 45A to 45I (however, the central prism
45E), the refraction angle of light,
The directions of refraction are different, whereby the light 53 emitted from the light emitting diode 19 is refracted in the direction of the optical axis 47 and emitted from the front lens 16 toward the rear of the vehicle body.

In this case, in the present embodiment, the surfaces of the respective prisms 45A to 45I are formed into concave curved surfaces with an appropriate curvature.However, the present invention is not limited to this, and various modifications are possible.
As shown in FIG. 13 and FIG. 13, the surfaces of all the prisms 45A to 45I may be formed as flat surfaces.

FIG. 14 is a block circuit configuration diagram of the stop lamp 13 configured as described above. In the figure, 101 is a line L
Based on the brake signal provided via 1, line L2
And a power supply unit for converting and outputting a power supply voltage (+ B) from the on-board battery supplied from L3 as a constant voltage + V _B (+5 V in this embodiment), and a clock 102 for transmitting a clock signal of a predetermined cycle to the shift circuit 104 Circuit, 103 is line L1
Interface circuit for sending a brake signal provided through the shift circuit 104 to the shift circuit 104,
This is a driver circuit that drives the display circuit 106 in accordance with the level of the output signal. In this block circuit configuration diagram, the power supply section 101 is related to the present invention. Clock circuit 102, interface circuit 103, shift circuit 10
4, the driver circuit 105 has a what is constant voltage + V _B from the power supply unit 101 is supplied, the display circuit 106 lines L2
The power supply voltage (+ B) is supplied directly through the power supply. In such a configuration, the power supply 10
1, a clock circuit 102, an interface circuit 103, a shift circuit 104, and a driver circuit 105 are constructed on a control board 100, and the clock circuit 102, the interface circuit 103, the shift circuit 104, and the driver circuit 105 cause a load on the power supply unit 101. As a control unit. The display circuit 106 is a circuit constructed by arranging the light emitting diodes 19 on the printed circuit boards 18-1 and 18-2, and the components of the code 28 are lines L1 to L3. The brake signal provided via the line L1 is a signal passing through a brake switch that is turned on when a brake pedal (not shown) is depressed, and changes from “L” level to “H” level when the brake switch is turned on. , When the brake switch is off, the signal is inverted from the “H” level to the “L” level.

FIG. 1 is a circuit configuration diagram showing FIG. 14 in more detail and concretely. Applied power supply unit 101 of the present invention, diodes D1, D2, resistors R1 to R5, R23, aluminum electrolytic capacitors C1, ceramic capacitor C2, zener diode D _Z,
It is composed of NPN transistors Q1, Q3 and PNP transistor Q2. Then, in the power supply unit 101, the diode D2, the transistors Q1 and Q2, the capacitor C1, the resistors R1 to R4,
A timer circuit 101-1 is configured by connecting R23 as shown in the figure, and a brake signal via a line L1 is supplied to the timer circuit 101-1. A constant voltage generating circuit 101-2 is configured by connecting the constant voltage diode D _Z , the transistor Q3, the capacitor C2, and the resistor R5 as shown in the figure.
1, the power supply voltage (+ B) is supplied via the line L2.

The clock circuit 102 includes a clock generator 102a, inverters INV1 to INV3, a capacitor C3, and resistors R6 and R7. The interface circuit 103 includes resistors R8 to R10,
It is composed of an inverter INV4 and an NPN transistor Q4. The shift circuit 104 includes a first shift register 104-1 and a second shift register 104-2. The driver circuit 105 includes inverters INV5 to INV10, resistors
R11 to R22 and NPN transistors Q5 to Q16. In FIG. 3, the display circuit 106 includes light-emitting diode groups 19R-1 to 19R each including four light-emitting diodes 19 sequentially arranged from the right end of the printed circuit board 18-1 in FIG.
-6 and light emitting diode groups 19L-1 to 19L-6, which are one group of four light emitting diodes 19 sequentially arranged from the left end side of the printed circuit board 18-2. Then, the transistors Q5, Q6 to Q15,
Light emitting diode group 19R-1, 19L-1 to 19R connected to the collector of Q16
-6 and 19L-6 are connected respectively.

Next, the operation of the stop lamp 13 configured as described above will be described. That is, when the brake pedal is depressed, that is, when the brake is turned on, the brake switch is turned on by the turn-on operation of the brake, and the applied brake signal via the line L1 is changed from the "L" level to the "H" level. Invert. With this "H" level brake signal as a mode signal, in the power supply unit 101, the transistor Q1 is turned on as the charge level of the capacitor C1 increases, and the subsequent transistors Q2, Q3
Is turned on, a constant voltage + V _B is generated. On the other hand, the "H" level and the brake signal via the line L1 are also supplied to the interface circuit 103 to turn on the transistor Q4, thereby setting the output of the inverter INV4 to the "H" level. This "H" level inverter
The output of INV4 is the shift register 104-1,
The output terminal 104-2 is supplied to each reset terminal of 104-2.
The levels of a to 104f are “L”. Therefore, in the driver circuit 105, all the outputs of the inverters INV5 to INV10 become "H" level, and all the transistors Q5 to Q16 are turned on. Thereby, in the display circuit 106, the light emitting diode groups 19R-1 to 19R-6 and the light emitting diode groups
All of 19L-1 to 19L-6 are lit, which draws attention to the driver of the following vehicle.

On the other hand, when the depressed brake pedal is released from the foot, that is, when the brake is turned off, the brake switch is turned off by the operation of turning off the brake, and the applied brake signal via the line L1 becomes higher than the "H" level. Invert to “L” level. For this reason, the "H" level mode signal to the power supply unit 101 disappears, but the charge and discharge of the capacitor C1 continues for a predetermined time (about 1 second in the present embodiment) and the transistor Q1 There kept on, the clock circuit 102 from the meantime the power supply unit 101, the interface circuit 103, the shift circuit 104, the supply of the constant voltage + V _B to the driver circuit 105 is continued. On the other hand, the "L" level brake signal via the line L1 is also supplied to the interface circuit 103. When the brake signal is inverted from the "H" level to the "L" level, the transistor Q4 is turned off. The output of INV4 becomes “L” level, and the shift registers 104-1, 104
The reset state of -2 is released. As a result, the clock signal supplied via the clock circuit 102 effectively acts on the shift registers 104-1 and 104-2. Based on the input clock signal, the level of the output terminal 104a is first set to "H". ". As a result, the output of the inverter INV5 becomes “L” level, the transistors Q5 and Q6 are turned off, and the light emitting diode group 19R−
1,19L-1 goes out. Then, based on the continuously input clock signal, after a lapse of a predetermined time, the level of the output terminal 104b becomes “H” and the output of the inverter INV6 becomes “L”.
Level. As a result, the light emitting diode group 19R-1, 1
In addition to 9L-1, the light emitting diode group 19 adjacent inside
R-2 to 19L-2 are turned off, and in the same manner, the output terminals 104c, 104d, 104e, and 104f sequentially become "H" level at predetermined time intervals, thereby turning off the light emitting diode group. The adjacent inner light emitting diode groups are turned off in a time sharing manner, and finally the light emitting diode groups 19R-6 and 19L-6.
Is turned off. That is, the printed circuit board 18-1,
Light emitting diode groups 19R-1 to 19R- arranged on 18-2
6, 19L-1 to 19L-6 are turned off so that they flow from the outside toward the center, and when the brake is changed to the off operation, the visibility to the driver of the following vehicle is greatly improved. Become.

After the light emitting diode groups 19R-6 and 19L-6 are turned off, the discharge of the charge of the capacitor C1 in the power supply unit 101 is completed, so that the transistor Q1 is turned off and the constant voltage + V _B Is interrupted. This will shut off the supply of the constant voltage + V _B to each circuit in the control unit, after having attempted to reduce power consumption, and that provided in the on-operation of the following brakes. That is, the light emitting diode groups 19R-1 to 19R-6, 19L-1 to 1
In the after all 9 L-6 is turned off, the supply of the constant voltage + V _B to the control unit is cut off, without the control unit to malfunction as a cause of noise or the like, the mode signal always through the line L1 The control section operates due to the occurrence and disappearance of light emitting diodes 19R-1 to 19R.
-6, 19L-1 to 19L6 will not be erroneously turned on.

FIG. 15 shows that when the number of light emitting diodes 19 arranged on the printed circuit boards 18-1 and 18-2 is 12 each, the light emitting diode group is turned on / off in response to the on / off operation of the brake.
It is a figure which shows a light-off pattern. FIG. 7A shows the pattern when the brake is off, and the light emitting diode groups 19R-1 'to 1R-1'.
9R-3 'and light emitting diode groups 19L-1' to 19L-3 '
Are all off. FIG. 7B shows a pattern when the brake is turned on. When the brake is turned on, the light emitting diode groups 19R-1 'to 19R-3' and the light emitting diode group 19R are turned off.
All of L-1 'to 19L-3' light up. When the brake is turned off from this state, first after t1 seconds (for example, 0.
After one second), the light emitting diode groups 19R-1 ', 19L at both ends
-1 'is turned off (FIG. 3 (c)). After a lapse of t2 seconds (for example, after a lapse of 0.2 seconds) from the OFF operation, in addition to the light emitting diode groups 19R-1 'and 19L-1', the light emitting diode groups 19R-2 'and 19L-2 adjacent to the inside thereof. ′ Is turned off ((d) in the figure), and after a lapse of t3 seconds (for example, after a lapse of 0.3 seconds) from the OFF operation, the light emitting diode group 19R-2 ′, 1 is turned off.
In addition to 9L-2 ', the last light-emitting diode groups 19R-3' and 19L-3 'adjacent to the inside thereof are turned off (FIG. 9 (e)). As is evident from the light-on / light-off pattern, when the brake is turned off, the light emitting diode group 19
The lights are turned off so that R-1 'to 19R-3' and 19L-1 'to 19L-3' flow from the outside toward the center, and visibility to the driver of the following vehicle is greatly improved.

Note that, in the embodiment, the time T required for the light emitting diode groups 19R-1 to 19R-6 and 19L-1 to 19L-6 from the fully lit state to the completely extinguished state due to the brake off operation is determined by the clock circuit 102. It is a certain fixed value determined based on the cycle of the clock signal to be transmitted. That is, the time division time of the light emitting diode group that is sequentially turned off from the outside is determined as a certain fixed value. On the other hand, as shown by a broken line in FIG. 14, if the clock circuit 102 is provided with an external volume 107 that varies the period of the transmission clock signal, the volume 107 can be adjusted to suit the user's preference. The time division time of the light emitting diode group can be set to an arbitrary value, and the required time T from the fully lit state to the completely unlit state of the light emitting diode group can be varied. No. 16
The figure shows the mounting state on the actual configuration of the volume 107,
The control board 100 is electrically connected to the control board 100 by a cord 108, and the lamp unit 17 is provided with a volume 107. The adjustment knob 107a is provided so as to be exposed from the front lens 16 to the outside. (See FIG. 17 and FIG. 18). The volume 107 does not necessarily have to be provided inside the lamp unit 17, and may be arranged, for example, on the driver's seat side.

In the embodiment, the light emitting diode group 19R-1
-19R-6 and 19L-1 to 19L-6 are turned off in a time-sharing manner from the outside toward the center, but they may be turned off from the center to the outside, or they may be turned off randomly. Such a configuration may be adopted. Furthermore, in the embodiment, the four light emitting diodes 19 are turned off as one group. However, it is needless to say that the four light emitting diodes 19 are not necessarily set as one group.
The light may be turned off in a time-division manner as a group, and the deformation thereof is free.

Further, in the embodiment, the stop lamp 13 is shown as an example incorporated in the rear spoiler 11, but may be incorporated in a mounting body such as a spoiler arranged on the roof of the vehicle body,
Also, it may be mounted on the rear indoor side of the rear window.

〔The invention's effect〕

As described above, according to the power supply device of the present invention, when the brake is turned off, the controller gradually turns off all the light-emitting diodes in the display circuit, and turns off all the light-emitting diodes in the display circuit. After the light goes off, the supply of the constant voltage (+ V _B ) from the power supply to the control unit is interrupted, reducing power consumption in the control unit and causing malfunction of the control unit due to noise and the like. Therefore, the disadvantage that the stop lamp is erroneously turned on does not occur.

[Brief description of the drawings]

1 is a circuit configuration diagram of a stop lamp to which an embodiment of a power supply device according to the present invention is applied, FIG. 2 is a front view of a main part showing a state where the stop lamp is incorporated in a rear spoiler, and FIG. Is a sectional view taken along line AA in FIG. 2, and FIG.
FIG. 5 is a sectional view taken along the line BB in FIG. 2, FIG. 5 is a sectional view taken along the line CC in FIG. 2, and FIG. 6 is a line DD in FIG.
7, FIG. 7 is a sectional view taken along line EE in FIG. 2, FIG. 8 is a sectional view taken along line FF in FIG. 2, FIG. 9 is an enlarged perspective view of the light control unit, and FIG. 9 is a cross-sectional view taken along line GG, FIG. 11 is a cross-sectional view taken along line HH in FIG. 9, and FIGS. 12 and 13 are cross-sectional views and vertical cross-sectional views showing another embodiment of the light control unit. FIG. 14 is a block circuit configuration diagram of the stop lamp shown in detail in FIG. 1, and FIG. 15 is a diagram showing the operation of turning on / off the brake when the number of light emitting diodes arranged on the left and right printed circuit boards is 12 each. FIG. 16 is a diagram showing a lighting / light-off pattern of a light emitting diode group in response to an OFF operation, FIG. 16 is a cross-sectional view taken along a line AA in FIG. 17, and a diagram showing an interior position of a volume externally attached to a clock circuit; The front view of the main part of the stop lamp showing the exposure position of the volume control knob, and FIG. 18 is shown in FIG. That the line F-F cross-sectional view, FIG. 19 is a perspective view of a rear spoiler incorporating a conventional stop lamp. 101 power supply unit, 102 clock circuit, 103 interface circuit, 104 shift circuit, 105 driver circuit, 101-1 timer circuit, 101-2 constant voltage generation circuit.

Claims (1)

(57) [Claims] 1. A display circuit comprising a large number of light emitting diodes and constantly receiving supply of a power supply voltage (+ B) from a vehicle-mounted battery; and a power supply voltage (+ B) to the display circuit as a branch input and a constant voltage (+ V). _B ), and a constant voltage (+ V _B ) supplied as an effective voltage from the power supply.
And a control unit that gradually turns off the light-emitting diodes that are fully lit in the display circuit in response to a mode signal that disappears due to the operation of turning off the brake while receiving the light-emitting diodes in the display circuit. The power supply unit receives a mode signal generated by the operation of turning on the brake, and supplies a constant voltage (+
V _B ) and a power supply validating means for validating the supply of the power supply, and a mode signal which disappears due to the operation of turning off the brake. A power supply invalidating means for invalidating the supply of the constant voltage (+ V _B ) to the control unit after a lapse of time.