JPS6015084B2 - headlights - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a novel headlamp, in particular, which removes moisture within the lamp chamber to prevent fogging on the inner surface of the lens or reflector due to temperature difference between the inside of the lamp chamber and the outside. This aims to provide a novel headlamp that does not impair the light distribution performance of the lamp.

Car headlights are often of the closed type, that is, the light source is enclosed within the space (light chamber) formed by the body and the lens on the front of the body, and is shielded from the outside. However, with the exception of all-glass sealed beam light bulbs, it is difficult to completely isolate the light chamber from everything outside.

For example, since a light bulb cap has a gateway or gap, moisture adhering to the back of the body through the bulb cap protruding outside the body may evaporate and enter the lamp chamber when the light bulb is turned on. Moisture that has entered the lamp chamber in this way condenses on the cold parts of the lamp and reflective mirror, creating fog. In addition, moisture adhering to the lamp cap is sucked into the lamp chamber due to a drop in pressure within the lamp chamber when the lamp is turned off, and this moisture evaporates when the lamp is turned on or due to heat from direct sunlight, forming a fog point and causing fog. Further, even if there is no intrusion of moisture from the outside, water vapor remaining in the lamp chamber may cause a sudden drop in temperature in the outside world, causing the dew point to drop and causing cloudiness. If the above-mentioned cloudiness occurs on the inner surface of the lens or reflective mirror surface, it will reduce the amount of light transmitted from the lens and reduce the reflection efficiency of the reflective mirror, which will impede the light distribution performance of the headlight. The result is Various attempts have been made in the past to prevent the occurrence of fogging as described above, but none of them can be said to have fully achieved the objective.

First, there are ways to improve the sealing performance by improving the bulb cap or the rubber cap that attaches to it, but no matter how much you improve the sealing performance, it is difficult to completely prevent water intrusion. Although this is not impossible, it would result in a significant increase in costs.

Also, since a certain amount of water intrusion is unavoidable, there is an idea to install a drain in the lower part of the light chamber and drain the moisture that has entered the light chamber from the drain to the outside of the light chamber. It is difficult to completely drain the moisture that has entered the lamp chamber, and in some cases, several grams of moisture may remain in the lamp chamber in the form of water droplets. This amount is sufficient to evaporate due to the heat generated when the lamp is lit or from heat from outside, causing fog inside the lamp.

Furthermore, a method of removing moisture from the lamp chamber by attaching a moisture absorbent such as silica gel, calcium sulfate, or activated alumina to the lamp has been considered. If the hygroscopic substance becomes saturated, the effect will not be lost, and if there is water intrusion that exceeds the rate of moisture absorption, the humidity in the lamp chamber cannot be lowered.

Therefore, the present inventors first proposed the Shin Patent No. 14 of 1973.
In No. 0212 (filed on November 13, 1978),
The method is based on a completely different principle from the conventional method described above. At the bottom, there is a headlight with an air hole that is suitable for the outside and the lotus.

In such a headlamp, when the headlamp is turned on, the temperature inside the lamp chamber rises, and the moisture that has adhered to and adsorbed on the surface of the lamp chamber evaporates and desorbs, and the water inside the heated lamp chamber rises. The amount of moisture contained in the air inside the lamp room increases rapidly, but at the same time, convection occurs within the lamp room due to the temperature difference, and this convection causes air laden with moisture to flow through the air holes in the upper part of the lamp chamber. The air is discharged outside the lamp chamber, and the effect of such convection is further enhanced by the air vents provided at the bottom of the lamp chamber, which reduces fogging of lenses and reflectors to an extent that is incomparable to the case of the secondary means described above. We were able to cite the effect of preventing this. However, in the headlight specifically shown in the above patent application, one air hole is provided on each side of the lower part of the light chamber and one air hole is provided in the center of the upper part of the light chamber. When applied to lighting, it has a much more effective fog prevention effect than conventional ones, but there are some unsatisfactory aspects. In other words, the main flow of air flowing in from both sides of the lower part of the lamp chamber is as shown by the dotted arrows in Figure 1, so when viewed from the front of the headlight a, the main flow is around the left and right shoulders (shaded areas) b, b. There was a problem that the fogging prevention was not complete. Therefore, the present invention aims to provide a novel headlamp, which is an improvement on the previous invention, and which is capable of achieving an even greater fog prevention effect when applied to a horizontally elongated headlamp. A body with a horizontally long rectangular closing part is provided with a reflecting mirror inside, and the front opening of the body is covered with a lens having a frontal shape of a generally horizontally long rectangular shape. The air vent is characterized in that the upper air hole is used as an exhaust hole, and the lower air hole is used as an intake hole.

The details of the headlamp of the present invention will be explained below with reference to the accompanying drawings.

FIGS. 2 to 4 show an example of the implementation of the headlamp of the present invention.

The headlamp 1 is arranged in a space (light chamber) 4 defined by a body 2 made of synthetic resin, a lens 3 that covers the front entrance of the body 2, and the body 2 and the lenses 3. It consists of a reflecting mirror 5 and a light bulb 7 arranged such that a light source part (filament) 6 is at a predetermined position with respect to the reflecting mirror 5.

A flange 8 extending outward is integrally formed at the opening edge of the body 2, and the rear edge of the lens 3 is brought into contact with the front surface of the flange 8 via a gasket 9. The lens 3 is fixed to the podium 2 by this. The rear part of the body 2 has a sekiguchi 10. A groove 11 is formed in the front surface of the flange 8 provided at the lower part of the body 2, and this groove 11 is formed by a through hole 12 formed in the center part through the thickness of the lower part of the body 2. It is connected to the outside. Reference numeral 13 denotes a notch that allows the groove 11 to pass through the inside of the body 2 at the lower side of the body 2. There is.

A groove 14 is also formed on the front surface of the flange 8 provided in the upper part of the body 2, and this groove 14 also has a through hole 15 formed in the center thereof through the thickness of the upper part of the body 2. Due to the external and poor luck. Then, connect the groove 14 to the body 2.
A notch 16 is provided at the upper side of the body 2 to allow the groove to pass through the inside of the body 2, and the groove 14 hangs downward from both ends of the horizontally extending portion and extends into the notch 16. There is. By disposing the gasket 9 on the front surface of the flange 8 so as to cover the front surface of the grooves 11 and 14, the air passage connecting the through hole 12 and the notch 13 and the through hole 15 and the notch opening 16 are connected. A connecting air passage is formed, which allows the lamp chamber 4 to communicate with the outside. The reflector 5 is made of metal, and has a closing hole formed at its rear, a cylindrical receiving portion 17 projecting rearward from the closing portion, and a flange 18 fixed to the base of the light bulb 7 attached to the receiving portion 17. Fixed in formation.

Reference numeral 19 denotes a synthetic resin ball receiver fixed to the back side of the upper part of one side edge of the reflector 5, and is formed at the end of the fulcrum rod 21 whose tip is embedded in the body 2. The poles 22 are iron-coupled to form a ball joint.

Reference numeral 23 denotes a synthetic resin nut fixed to a bracket 24 fixed to the back side of the upper part of the other side edge of the reflecting mirror 5.

Reference numeral 26 denotes an adjusting rod, whose intermediate portion is rotatably but non-slidably inserted into the body 2, and whose tip portion is screwed into the nut 23.

The rear part of the adjusting rod 25 has an integrated tsuba 26.
The rod 25 is inserted into the insertion hole 27 formed in the body 2 until the collar 26 comes into contact with the rear surface of the body 2. Then, a coil spring 28 made of outer iron is compressed on the adjusting rod 25 between the inner surface of the body 2 and the nut 23, so that the rod 25 is supported with respect to the body 2 so as to be rotatable and non-slidable. be done.
Note that 29 is an operation knob fixed to the rear end of the adjusting rod 25 protruding from the rear surface of the pod 2. When the adjusting rod 25 is rotated, the tip of the adjusting rod 25 is inserted into or returned to the nut 23, so that the position of the nut 23 approaches or moves away from the body 2. Then, the nut 23, the bracket 24, and the adjusting rod 2 are installed.
The mechanism according to No. 5 includes the aforementioned ball receiver 19 and bracket 20.
and a fulcrum rod 21. Therefore, the reflecting mirror 5 is supported at three points with respect to the body 2 so as to be able to freely adjust its angle. Reference numeral 30 denotes a rubber cover that closes the rear opening of the body 2, and covers a thick-walled annular body mounting portion 31 and a similarly ring-shaped bulb mounting portion 32 between the two thick-walled portions 31 and 32. A thin connecting portion 33 to be connected is integrally formed.

An annular groove 34 is formed on the inner surface of the body attachment part 31, and the annular groove 34 is engaged with an annular flange 35 formed on the green rear end of the body 2 entrance part 10, thereby attaching the body to the body. A portion 31 is attached to the body 2. Further, the tip of the body attachment part 31 is made thinner as it goes forward to form an annular lip-shaped part 36, and this lip-shaped part 36 is attached to the body 2.
This part is sealed. The annular light bulb adhesive part 32 is attached to the base 37 of the light bulb 7 that protrudes rearward from the receiving part 17 of the reflector 5, thereby closing the space created between the rear of the body 2 and the rear of the reflector 5. be done. In the above-mentioned automobile headlamp, when the light bulb 7 is turned on, the temperature inside the lamp chamber 4 increases and air convection occurs.

Since air passages 16→14→15 are provided in the upper part of the lamp odor to communicate with the outside, this convection is caused by air having a high temperature and containing a large amount of moisture flowing through the upper air passage 1.
6 → 14 → 15 to the outside, and instead, outside air is introduced into the lamp chamber 4 through the lower air passages 12 → 11 → 13, and the moisture inside the lamp chamber 4 is successively released outside the lamp chamber 4. This prevents fogging from occurring. For headlights with a horizontally rectangular front shape, there is less light hitting the corners of the lens, and the temperature in these parts is lower, so if there is humidity, these parts will Easy to connect the dots. However, in the headlamp according to the present invention, there are air holes in the upper and lower parts of the light chamber that are suitable for communicating with outside air.
In the above embodiment, the notches 16, 16 and 13, 13) are provided, and these air holes are provided near both sides of the lamp chamber, so the main flow of air is as shown by the dotted arrows in FIG. In this case, the corner portion of the lamp room where the temperature is relatively low and is likely to form a cloud is well exposed to air, and fogging in that portion can be effectively prevented. Also, like the headlight above, body 2
If a gap is provided between the lenses 3 and the reflector 5, the air entering from the lower intake holes 13, 13 will be
Air flows as shown by the solid line arrows in the figure, and especially with respect to the reflecting mirror 5, the airflow comes into contact with it from both sides, so that the reflecting mirror 5 is quickly cleared of mist.

Furthermore, as in the above-mentioned headlamp, if the front end of the reflector 5 is located in front of the air holes 13, 13, 16, and 16, the air flowing toward the lens 3 is made to meander, and the lens 3 Since it hits the inner surface, it also has the effect of quickly removing fog from the lens 3.

Furthermore, if the front surface of the lens is tilted so that it deviates rearward as it goes upwards, as in the above-mentioned headlamp, the air flowing into the lamp chamber will rise along the inner surface of the lens 3 while going upwards. Therefore, the fog generated on the inner surface of the lens 3 can be quickly removed.

Next, the fog removal performance of the headlamp according to the present invention will be described. Figures 2 to 4 are used for testing.
It has the structure shown in the figure, body length 260m/body, width 130w, body depth 90/body, reflector length 21.
0 skin' desk, same short axis 110 / skin, total depth 150 / m
, light source rating 12V-60W, intake hole (cross-sectional area 4m) x 2
, exhaust holes (cross-sectional area: 4 m) x 2 were prepared, and the performance of this embodiment of the present invention was evaluated using 2 intake holes (with a cross-sectional area of 4 m) (formation position is the same as the embodiment of the present invention), exhaust holes ( Cross section cut 9m)×
1 (the formation position was one in the center of the upper part), and the following table shows the test results compared with a comparative example formed in the same manner as the example of the present invention. In addition, the "fog removal time" here refers to the time when 1.0% water is poured into the lamp chamber, heated in an oven at 70 qo for 1 hour, then returned to room temperature (20 qo), and the time taken to remove fog inside the lamp chamber. was generated, the light bulb was turned on at 12V-60W in this state, and the time until the cloudiness disappeared and there was no deterioration in light distribution was measured.

In addition, the results of the "water injection test" were as follows: A small hole (diameter approximately 1.0 skin/skin) reaching the base of the light bulb was formed in the body, the light bulb was turned on at 12V-60W, and a syringe needle was inserted through the hole 4. A small amount of water was injected into the light bulb base using a water bottle, and the maximum amount of water without fogging was measured. As can be seen from the above test, the headlight according to the present invention requires less than half the time of the comparative example to remove fog, and the water injection test results also show that the headlamp of the present invention requires more than half the time of the comparative example. It can be seen from the numerical values that it has extremely excellent performance.

[Brief explanation of the drawing]

Fig. 1 is a schematic front view showing the problems of the headlamp previously proposed by the applicant, Figs. 2 to 4 show an example of implementation of the headlamp of the present invention, and Fig. 2 Front view with removed, 3rd
The figure is a sectional view taken along the line mm in Fig. 2, Fig. 4 is a sectional view taken along the line W-W in Fig. 2, and Fig. 5 is a sectional view taken along the line W-W in Fig. 2. The front view showing the characteristics of the flow and FIG. 6 are also longitudinal cross-sectional views. Explanation of symbols: 1... Headlight, 2... Pode, 3... Lens, 4... Light chamber, 5...
...Reflector, 13...Intake hole, 16...
...Exhaust hole. Figure 1 Figure 2 Figure 4 Figure 5 Figure 6 Figure 3

Claims (1)

[Scope of Claims] 1. Upper and lower parts of a lamp chamber, comprising a reflecting mirror inside a body having a substantially horizontally long rectangular opening, and a front opening of the body covered with a lens having a substantially horizontally long rectangular front face shape. A headlamp characterized in that air holes communicating with the outside are formed near both sides of the headlight, the upper air hole is used as an exhaust hole, and the lower air hole is used as an intake hole. 2. A lamp chamber has a reflecting mirror inside a body having a substantially horizontally long rectangular opening, and a front opening of the body is covered with a lens having a substantially horizontally long rectangular front shape. A headlamp in which an air hole is formed in communication with the reflector, the upper air hole is an exhaust hole, and the lower air hole is an intake hole, and the headlamp is characterized by providing an appropriate distance between the back surface of the reflector and the body. Headlights. 3 A reflecting mirror is provided inside a body having a substantially horizontally long rectangular opening, and a front opening of the body is covered with a lens having a substantially horizontally long rectangular front shape. In a headlamp where the upper air hole is an exhaust hole and the lower air hole is an intake hole, the air hole opens into the lamp chamber at the junction between the front end of the body and the rear end of the lens. A headlamp characterized in that at least one of the upper part and the lower part of the front end of the reflector is located in front of the air hole forming part. 4 A reflecting mirror is provided inside a body having a substantially horizontally long rectangular opening, and a front opening of the body is covered with a lens having a substantially horizontally long rectangular front shape. In a headlamp in which an air hole is formed that communicates with the air hole, the upper air hole is used as an exhaust hole, and the lower air hole is used as an intake hole, the front surface of the lens is tilted so that it deviates rearward as it goes upward. Characteristic headlights.