JP2641871B2 - Retractable headlamp device - Google Patents

Abstract

PURPOSE:To prevent trouble such as seizure of driving motors or dead-battery from occurring when break of feeder circuits by circuit breakers is detected by providing a feed inhibition means which inhibits feed from the feeder circuits to the driving motors thereafter. CONSTITUTION:When driving motors 16, 17 are locked and circuit breakers 26, 27 break circuits at the time of that electric source is supplied from the lowering command terminals d of rotating switches 20, 21 to the driving motors 16, 17, a transistor T2 is not fed and thereby the transistor T2 is in an OFF state so that cut relays 14, 15 are also in OFF state. In addition, at nearly the same time, discharge of a condenser C ends so that a transistor T3 becomes in OFF state. Accordingly, as the transistors T2 T3 are in OFF state, even though the circuit breakers 26, 27 are reset thereafter, the cut relays 14, 15 do not work and current does not flow to the lowering command terminals d of the rotating switches 20, 21 so that power is not supplied to the driving motors 16, 17.

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a retractable headlamp device capable of driving up and down a headlamp, and more particularly to a technique for preventing intermittent overcurrent from flowing to a drive motor. .

[Conventional technology]

Such an apparatus is conventionally configured as shown in FIG. 5, for example. Referring to FIG. 1, reference numeral 1 denotes a head lamp unit including a lamp filament, a reflector, a lens, a housing, and the like;
Are drive motors for driving the headlamp 1 up and down, 3
Is a power supply control device that controls power supply to the drive motor 2, 4 is a power supply circuit that supplies power to the drive motor 2 based on operation of the headlamp switch 5, 6 is
This is a power cutoff device that cuts off power supply to the drive motor when the headlamp section 1 reaches a predetermined position. 7
Is a return-type circuit breaker disposed on a power supply line to the drive motor 2. This circuit breaker 7
When the drive mechanism 2 of the headlamp 1 is frozen or pebbles enter and the drive motor 2 is locked, the power supply line is cut off to protect the drive motor 2 from overcurrent. An apparatus similar to this is described in, for example, JP-A-57-74235.

[Problems to be solved by the invention]

By the way, the circuit breaker 7 in the conventional retractable headlamp apparatus is connected to a circuit breaker 7 which detects an overcurrent and turns off the power supply line (OFF) after a predetermined time has elapsed, and then connects (ON) again to form a power supply line. If the driver or the like does not notice the locked state of the drive motor and leaves it in that state for a long time, the circuit breaker 7 repeatedly turns ON and OFF, causing a burning failure of the drive motor 2, There is a problem that the battery is dead. In particular, when the headlamp section is stored after arriving at the destination, the occupant often does not notice that the drive motor is locked to leave the vehicle.

Therefore, an object of the present invention is to prevent power from being supplied to the drive motor when the drive motor is locked unless the locked state is released.

[Means for solving the problem]

In order to achieve the above object and to solve the problems of the prior art, the retractable headlamp device according to the present invention detects the circuit breaker interrupting the power supply path when the headlamp section is driven to descend, and detects and detects this. A power supply prohibition unit that prohibits power supply from the power supply path to the drive motor is then used to prohibit power supply, while power supply to the drive motor is resumed when the circuit breaker returns from the cut-off state when the headlamp is driven up. It is.

[Action]

According to the present invention, when the drive motor locks and an overcurrent flows during the downward drive of the headlamp section, the circuit breaker operates to temporarily cut off (OFF) the power supply line. The power supply prohibiting means detects OFF of the circuit breaker and thereafter prohibits power supply from the power supply control means to the drive motor, so that power is not supplied to the drive motor even if the circuit breaker returns to ON. On the other hand, when the circuit breaker operates and the power supply line is temporarily interrupted when the headlamp section is driven upward, power supply to the drive motor is restarted when the circuit breaker returns from the interrupted state thereafter.

〔Example〕

FIG. 1 shows an example of a retractable headlamp device according to the present invention. In the figure, reference numeral 11 denotes a headlamp switch, which is provided with OFF, one-stage contact, two-stage contact, and main (M), dimmer (D), and passing (P) contacts. 12 and 13 are lamp filaments, 14 and 15 are cut relays for inhibiting lighting during driving of the lamp, that is, when the optical axis is fluctuating, 16 and 17 are driving motors for driving the head lamp unit up and down, and 18 and 19 are driving motors 16 and 19. The relays for switching the power supply paths to the power supply units 17 and 17 are rotated by the drive motors 16 and 17, and the head lamp unit reaches the preset top dead center (lighting position) and bottom dead center (storage position). Sometimes drive motor 1
This is a rotary switch that cuts off power supply to 6, 17 and conducts electricity to the other power supply path. The rotary switches 20, 21 are at the position shown in FIG. 2A at the top dead center, and at the position shown in FIG. 2B at the bottom dead center. Symbol u in the figure is a rising command terminal,
d is a descending command terminal. 22 is the drive motor 16, 17
In the circuit for supplying power to the diode D ₁ to D _14, the Zener diode ZD _1, ZD ₂ resistors R ₁ to R _10, capacitors C ₁ -C _3,
And it consists of a transistor T ₁ ~T _4.

Also, 26 and 27 are circuit breakers, F ₁ to F ₄ fuse, D ₁₆ to D ₁₉ diodes for preventing reverse flow, 29 is a battery. In this head lap device, the relationship between the operation of the head lamp switch 11, the raising / lowering operation of the head lamp unit, and the turning on / off operation is basically as shown in FIG.

Returning to FIG. 1, the head lamp unit is in an open state (lighting position).
, The ascending command terminal u is open, and the descending command terminal d is in conduction with the rotary switch 20. At this time, the capacitor C _{1 is} passed through the diodes D ₁₁ and D _13.
There are charged, the capacitor C ₂ is charged through the diode D _10, D _12. Also, transistor T ₄ is ON,
Transistor T ₃ is OFF.

Now switching the headlamp switch 11 from the two-step contact to OFF, but the capacitor C _2, C ₃ is discharged, by setting longer the discharge time of the capacitor C ₃ than the capacitor C _2, the capacitor C ₂ at the end of discharge, thus the transistor T ₃ is turned oN at the time OFF of the transistor T _4, cut relay 15 is activated, descent command terminal of the normally open contact → turning switches 20 and 21 of the cut relay 14 d → Power is supplied to the drive motors 16 and 17. At this time, circuit breaker 2
From downstream of 6,27, diodes D ₁₈ and D ₁₉ → diode D ₂₀ →
Transistor T ₂ to the base and the current of the transistor T ₂ flows
Turns ON. Therefore, even if the discharging of the capacitor C ₃ is completed and the transistor T ₃ is turned off, the diode D ₇ → the transistor T 3
₂ → Cut relays 14, 15
Continues to operate, the normally open contacts of the cut relays 14 and 15 → the descending command terminal d of the rotary switches 20 and 21 → the current flows through the drive motors 16 and 17, and the rotary switches 20 and 21 reach the bottom dead center and 2 Power is supplied to the drive motors 16 and 17 until the state shown in FIG.

Next, in this case, that is, when power is supplied to the drive motors 16 and 17 from the descent command terminals d of the rotary switches 20 and 21, the drive motor is driven by the pebbles narrowing under the headlamp portion and the like. locked when the circuit breaker 26 and 27 is cut off the circuit, the transistor T ₂ so also eliminates power supply to the transistor T ₂ are OFF, thus also cut relay 14, 15
Turns off. Further, this discharge of the capacitor C ₃ is completed by front and rear, the transistor T ₃ is turned OFF. Therefore, after this, even if the circuit breakers 26 and 27 return, the cut relays 14 and 15 do not operate because the transistors T ₂ and T ₃ are OFF.
No current flows to the descent command terminal d of the rotary switches 20 and 21,
Power is not supplied to the drive motors 16 and 17. To store the headlamp unit is switched eliminate the cause of the motor lock headlamp switch 11 to the two-step contact is charged capacitor C _3, then be switched to the headlamp switch 11 to OFF, the transistor T ₃ can supply the power to the drive motor 16, 17 from the descent command terminal d of rotating switches 20, 21 as described above by turns oN.

On the other hand, in a case where the head lamp unit is driven to rise from the storage position to the lighting position, the head lamp switch 11 is connected to a two-stage contact, and the transistor T ₁ is connected through the diode D _3.
ON. Therefore, the rising command terminals u of the rotary switches 20 and 21 → the diodes D ₁₆ and D ₁₇ → the switching relays 18 and 19 → the transistor T ₁ → ground and current flow, and the switching relays 18 and 19 operate to open the normally open contact. Closed, rise command terminal u → switching relay 1
The normally open contacts 8 and 19 → the drive motors 16 and 17 operate until current flows through the drive motors 16 and 17 and reaches the top dead center. In the case of this rising operation, in this embodiment, even if the circuit breakers 26 and 27 cut off the circuit, power is supplied to the drive motors 16 and 17 again after the circuit breakers 26 and 27 return. That is, since transistors T ₁ circuit breaker 16, 17 also blocks the circuit still remains ON, the said circuit breaker
If 26, 27 returns to ON, as described above, the rotation switch 20,
21 ascending command terminal u → switching relay 18, 19 → transistor T
₁ → The ground and current flow, the switching relays 18 and 19 are activated, and power is supplied to the drive motors 16 and 17. In the case of ascending operation, re-supply of power after returning from the circuit breakers 26 and 27 is performed in the case of ascending operation because the occupant is in the vehicle and the motor lock is noticed immediately and appropriate measures are taken. The reason is that the engine will be operating in the case of the ascent operation, and the motor will be thawed immediately in the case of the motor lock due to freezing.

FIG. 4 shows another configuration example of the rotary switch 30 and the lift command terminal u. This plurality of raised command terminals u, for example, three raised command terminals u _1, with u _2, provided u _3, their respective elevated command terminals u _1, u _2, brake terminals corresponding integral in one to u ₃ b ₁ , b ₂ , and b ₃ are provided, and when one of the ascending command terminals u ₃ is selected by the optical axis setting switch 31, the changeover switch 32 interlocked with the optical axis setting switch 31 switches to the one brake terminal b ₃ It is intended to be connected to. Therefore, current delivered to the increase command terminal u ₃ through the optical axis setting switch 31, flows turning switch 30 → Brake terminal b ₃ → changeover switch 32 → drive motor 16, thereby driving the motor 16 headlamp unit Drive up. Then, the shutdown circuit when the brake terminal b ₃ and its corresponding increase command terminal u ₃ are both out notch of the rotating switch 30 (insulating part), so as to stop the drive motor 16 .
Incidentally, FIG. 4 when the rising command terminal u ₃ and the brake terminal b ₃ is selected, these terminals indicates a state in which the circuit is interrupted out the notch. Therefore, according to this configuration, by selecting any one of the terminals by the optical axis setting switch 31, the operation amount of the drive motor 16, and thus the stop position of the headlamp portion, can be appropriately changed. The optical axis can be freely adjusted when the vehicle posture changes, for example, when the weight of the rear part increases.

〔effect〕

As described above, according to the retractable headlamp device of the present invention, when the headlamp section is driven to descend, when the circuit breaker cuts off the power supply path, the power supply to the drive motor is subsequently prohibited while the headlamp section is driven. At the time of ascending drive, the power supply is resumed when the circuit breaker returns from the cut-off state.Therefore, at the time of head lamp lowering drive, when the drive motor locks and overcurrent flows and the circuit breaker is cut off, The drive motor does not operate after the circuit breaker returns. Therefore, even if pebbles in the headlamp section are caught or the drive mechanism section is frozen, the motor lock state occurs, and even if the occupant does not notice it and leaves the state, the drive motor burnout failure and battery rise Such a problem does not occur. On the other hand, when the headlamp section is driven up, it is usually during running.After the circuit breaker returns from the cut-off state, the power supply to the drive motor is restarted to urge the headlamp to light up. We can expect security.

[Brief description of the drawings]

FIG. 1 is a circuit diagram showing an example of a retractable headlamp device according to the present invention, FIG. 2 (A) is an explanatory diagram showing an example of a state in which a rotary switch according to the present invention is at a top dead center, and FIG. FIG. 3B is an explanatory diagram showing an example of a state where the rotary switch according to the present invention is at the bottom dead center, FIG. 3 is a time chart showing a basic operation example of the device according to the present invention, and FIG. FIG. 5 is an explanatory diagram showing an example of a contact structure of a rotation switch unit, and FIG. 5 is an electrical block diagram showing an example of a conventional retractable headlamp device. 11… Head lamp switch 12,13… Lamp filament 14,15… Cut relay 16,17… Driving motor 18,19… Switching relay 20,21,30… Rotating switch 26,27… Circuit Breaker 31 …… Optical axis setting switch 32 …… Changeover switch

 ──────────────────────────────────────────────────続 き Continuation of front page (72) Inventor Harushige Yamamoto 5-28-6 Omori Nishi, Ota-ku, Tokyo Niles Parts Co., Ltd. (56) References JP-A-58-61031 (JP, A) Kaisho 60-67238 (JP, A)

Claims (1)

(57) [Claims] A drive motor for driving the headlamp to move up and down, power supply control means for supplying power to the drive motor from one of forward and reverse power supply paths until the headlamp reaches a predetermined position; A circuit breaker for temporarily interrupting the power supply path when a current equal to or greater than a predetermined value is supplied from the control means to the drive motor. When the path is interrupted, power is inhibited using the power supply prohibiting means that detects this and then inhibits power supply from the power supply path to the drive motor.On the other hand, when the headlamp is driven up, the circuit breaker is turned off. A retractable headlamp device characterized by restarting power supply to the drive motor upon recovery.