JP2011253737A - Waterproof structure of small light and small light - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a waterproof structure of a small light extremely excellent in waterproofness and a small light adopting the waterproof structure.SOLUTION: The waterproof structure for the small light, together with the small light equipped with the waterproof structure, for waterproofing a gap between a casing and a separate body in the small light equipped with the casing with an opening and the separate body arranged at the opening, is provided with an inside cover for covering an outside face of the separate body and a surface wall and side walls of the casing, and an outside cover for covering an outside face of the casing other than the opening. Both the inside cover and the outside cover are formed of an elastomer material of the same quality.

Description

  The present invention relates to a waterproof structure for a small light and a small light having the waterproof structure.

  In addition to flashlights, portable lights that emit light using built-in batteries are used today as headlamps for bicycles, etc., and for illumination and reciprocal confirmation in leisure activities such as trekking, mountain climbing, and diving. As described above, since the portable light is used in an environment where it is easy to touch water such as rainy weather, it is required to have not only portability, wearability and switch operability but also excellent waterproofness.

  As a conventional general portable light, an extremely small and high-brightness LED (Light Emitting Diode) is used as a light source, and the light emitting part and the battery housing part are miniaturized, thereby reducing the overall size and size. A lighter portable light is provided (see, for example, Patent Document 1).

  In general, a portable light using such an LED is disposed in (a) a cylindrical casing formed by screwing a transparent front end and a rear part, and (b) near the front end in the casing. An LED, (c) a battery housed in the casing, (d) an electrical circuit configured to be electrically connectable to the LED and the battery, and (e) an electrical circuit that is disposed on the side of the casing and interrupts the electrical circuit. And a switch for

  However, many of the conventional portable lights are not provided with sufficient waterproofing measures, and even when the waterproofing measures are provided, the waterproofness is not sufficient. As a waterproof structure of such a conventional portable light, for example, a gap in a connection portion of a member other than the light is covered with a waterproof cover (see, for example, Patent Document 1), and a gap is put in a gap in the connection portion of the member. A material provided with a waterproof packing made of a material, a rubber material, or the like (see, for example, Patent Document 2) is provided, but none of them can withstand long-term use in an environment where it is exposed to water. Thus, there is a demand for a waterproof structure having excellent waterproofness that does not immerse inside the light even when used for a long time in an environment exposed to water such as a headlamp such as a bicycle or diving.

JP 2009-266630 A JP 2003-308724 A

  The present invention has been made in view of these disadvantages, and has a waterproof structure for a small light having a simple structure and excellent waterproofness while maintaining compactness, lightness and high brightness, and the waterproof structure. The purpose is to provide a small light.

The invention made to solve the above problems is
A structure for waterproofing a gap between a casing and a separate part in a small light having a casing having an opening and a separate part disposed in the opening,
An inner cover covering the outer surface of the separate part and the front wall and side wall of the casing;
An outer cover that covers the outer surface of the casing other than the opening,
A waterproof structure for a small light, characterized in that the inner cover and the outer cover are formed of the same elastomer material.

  The waterproof structure of the small light includes an inner cover and an outer cover. The inner cover integrally covers the outer surface of the separate part and the front wall and side wall of the casing, and the outer cover covers the outer surface of the casing other than the opening. Further covering from the outside of the cover. As described above, the inner cover integrally covers the gap generated between the separate part and the casing, thereby exhibiting extremely excellent waterproofness. In addition, the waterproof structure of the small light has a simple structure, and can prevent water intrusion without using a waterproof member such as an O-ring for the joints and switch parts of the members. Can be demonstrated.

  Further, in the waterproof structure of the small light, the inner cover and the outer cover are made of the same elastomer material. Since the elastomer material is flexible and has elasticity, the inner cover and the outer cover are deformed and closely adhered along the shape of the member to be included, and the gap generated between the members can be effectively sealed. In addition, since the inner cover and the outer cover are formed of the same elastomer material, the inner cover and the outer cover are closely adhered to each other, and the waterproofness of the small light is further promoted.

  Further, since the above-described elastomer material has transparency by being stretched thinly, even if the inner cover covers the light source (LED), the reduction of the light amount is suppressed, and sufficient light can be transmitted as light. As described above, the waterproof structure of the small light has very excellent light utilization efficiency, and can provide not only excellent waterproofness but also sufficient brightness to the small light adopting the waterproof structure of the small light. it can.

  The inner cover and the outer cover are preferably overlapped in a vacuum bonded state. In this way, the inner cover and the outer cover are closely attached to each other so as to be in a substantially vacuum state so that air or water does not enter between these two members, thereby waterproofing the small light. The waterproofness of the structure can be further promoted.

  Silicone rubber (including silicone resin) is preferable as the elastomer material. Since such silicone rubber has good plasticity, flexibility, deformability, sealing performance, heat resistance, weather resistance, etc., the silicone rubber is used as a material for forming the inner cover and the outer cover, so that the shape of the member to be coated can be obtained. In addition, it can be deformed flexibly and a good vacuum bonding state can be formed in the waterproof structure of the small light. As a result, the waterproof property of the waterproof structure is promoted, and the heat resistance, weather resistance, etc. of the small light employing the waterproof structure can be promoted.

Moreover, another invention made in order to solve the said subject is:
A flat bottomed cylindrical casing having a circular opening in the center of the surface;
A flat battery housed on the bottom side in the casing;
A disc-shaped circuit board that is mounted and housed on the surface side of the battery in the casing, and that has an LED, a control unit that controls the blinking state of the LED, and a pressure switch that switches the blinking state of the LED by the control unit on the surface side When,
A transparent dome covering the LED and an annular flange extending outward from the bottom opening of the dome; the flange is disposed on the surface side of the circuit board in the casing; An LED cover stored so as to protrude from the opening;
The waterproof structure according to claim 1, claim 2 or claim 3,
The press switch is disposed on the outer peripheral portion of the circuit board so as to contact the flange portion of the LED cover,
A separate part of the waterproof structure is a dome part of the LED cover, and is a small light configured to waterproof a gap between the casing and the dome part of the LED cover.

  Since the small light has the waterproof structure described above, it is extremely excellent in waterproofness. Therefore, it can be suitably used for a long period of time in an environment where it is easy to touch water such as a headlamp such as a bicycle, trekking, mountain climbing or diving.

  The covering thickness of the dome portion of the LED cover in the inner cover is preferably 0.1 mm or more and 1 mm or less. By setting the thickness of the inner cover in this way, it not only has sufficient durability and waterproofness as the inner cover, but also can minimize the amount of light reduction by the inner cover, and as a small light Sufficient luminance can be maintained.

  It is preferable that the outer cover has a pair of annular mounting pieces that extend to the left and right. Since the outer cover is formed of an elastomer material, it is soft and has flexibility and stretchability. Therefore, the outer cover has a pair of annular mounting pieces extending to the left and right, so that the small light can be wrapped around the handle portion of a bicycle, a motorcycle, or the like by using the attached engaging piece, It can be attached to a body such as a finger or an arm, and the small light can be easily and simply attached to various target locations having different diameters and shapes.

  Here, the “vacuum bonded state” means that the members are closely adhered to each other so that air, water, etc. do not enter between different members, for example, between the inner cover and the outer cover. Means state.

  As described above, the waterproof structure of the small light according to the present invention exhibits extremely excellent waterproof performance by combining the material and shape of the inner cover and the outer cover without requiring complicated parts and structures. be able to. In addition, the compact light of the present invention is not only excellent in portability, wearability, and switch operability, but also has extremely excellent waterproof properties by adopting the above-described waterproof structure.

The typical exploded perspective view showing the small light concerning one embodiment of the present invention. The typical perspective view which shows the state which assembled the small light of FIG. 1 is a schematic partial cross-sectional view showing an inner cover and an outer cover in a state where the small light of FIG. 1 is assembled. The typical perspective view which shows the state which attached the small light of FIG. 1 to the cylinder. Schematic plan view showing the circuit board of the small light of FIG. 1 is a schematic central longitudinal sectional view of the circuit board and LED cover portion of the small light of FIG.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings as appropriate.

  1 mainly includes a casing 1, a battery 2, a circuit board 3, an LED cover 4, an inner cover 5, and an outer cover 6. 1 includes a waterproof structure including a casing 1, an LED cover 4, an inner cover 5, and an outer cover 6, and the LED cover 4 corresponds to a separate part.

  The casing 1 has a flat bottomed cylindrical shape having a circular opening 7 at the center of the surface. The casing 1 has a casing body 1a and a casing lid portion 1b. The casing body 1a is a flat cylindrical body, and has a front wall 8 having an opening at the lower end and an opening 7 at the center. That is, the casing body 1a is a cylindrical body having a flange-like and annular front wall 8 and a cylindrical side wall 9 on the surface side. On the other hand, the casing lid 1b is an extremely flat bottomed cylindrical body having substantially the same diameter as the casing body 1a. A circumferential groove 10 is formed in the vicinity of the lower end of the outer surface of the side wall 9 of the casing body 1a, and a circumferential ridge 11 is formed at the upper end of the inner surface of the side wall of the casing lid 1b. It is comprised so that the protruding item | line part 11 may fit. Due to the engagement structure including the groove 10 and the ridge 11, the casing body 1 a and the casing lid 1 b can be attached and detached. Further, a cutout portion 12 for facilitating the removal of the casing lid portion 1b engaged with the casing body 1a is formed in a part of the side wall of the casing lid portion 1b.

  The material for forming the casing 1 is not particularly limited. For example, a synthetic resin, a metal material, wood, or the like is used. From the viewpoint of weight reduction, a synthetic resin is preferable. Examples of the synthetic resin used for the casing 1 include (a) thermosetting resins such as phenol resin, melamine resin, unsaturated polyester resin, epoxy resin, polyurethane resin, silicone resin, (b) polyethylene, polypropylene, polystyrene, General-purpose thermoplastic resins such as polyvinyl chloride, polyvinyl acetate, ABS resin, (c) Engineering plastics such as nylon (polyamide), polyacetal, polycarbonate, polyethylene terephthalate, polybutylene terephthalate, (d) polyphenylene oxide, polyarylate, polysulfone And special engineering plastics such as polyphenylene sulfide, polyamideimide, polyimide, and fluororesin. Among these, as the material for forming the casing body 1a, polyvinyl chloride having high weather resistance, ABS resin and engineering plastics excellent in strength and durability are preferable. As a material for forming the casing lid portion 1b, polypropylene which is relatively flexible and can be easily attached and detached is preferable. In addition, as a metal material used for the casing 1, aluminum alloy, copper alloy, iron, steel, stainless steel etc. are mentioned, for example.

  The battery 2 has a flat shape. The battery 2 is preferably a button-type battery or a coin-type battery having a small thickness, and greatly contributes to the reduction in size and weight of the casing 1 and thus the small light. Thus, even if a flat button-type battery or a coin-type battery is used as the battery 2, the LED 14 used as the light source has low power consumption, so that the small light can be sufficiently operated. The battery 2 can be replaced by removing the casing lid portion 1b from the casing body 1a.

  In the small light, two batteries 2 are stacked and used in series, and are stored on the bottom side of the casing 1 with the plus side facing the bottom surface. Between the battery 2 on the bottom side and the bottom surface of the casing 1 (casing lid 1b), the object is to press the battery 2 against the battery contacts on the back surface of the circuit board 3, and the object is to mitigate the impact of the battery 2 on the casing 1. For this purpose, a disk-like elastic body 13 is provided. The material for forming the elastic body 13 is not particularly limited as long as it has elasticity, and, for example, foamed polyurethane or the like is employed.

  The circuit board 3 has a disk shape and is disposed and stored immediately above the battery 2 (the battery 2 on the front surface side) in the casing 1. On the surface side of the circuit board 3, as shown in FIG. 5, an electric circuit (not shown) that conducts electricity to the battery 2, an LED 14, a control unit 15, a push switch 16, and the like are mainly mounted. In addition, a capacitor, a resistor, and the like are incorporated on the circuit board 3 as necessary. In addition, semicircular concave portions 22 are formed on the outer edge portion of the circuit board 3 at substantially equal angular intervals, and convex portions (illustrated) formed on the inner surface of the casing 1 (casing body 1a) at substantially equal angular intervals. And the circuit board 3 does not rotate in the casing 1.

  The LED 14 projects from the center of the circuit board 3 and is electrically connected to the electric circuit. The lower periphery of the LED 14 is protected and supported by a cylindrical LED support 17 projecting from the center of the circuit board 3. Although the kind of this LED14 is not specifically limited, What emits white light with high brightness | luminance is preferable, What emits other light rays, such as red and blue, is employ | adopted suitably.

  The control unit 15 controls the blinking state (for example, lighting, extinguishing, predetermined blinking pattern, etc.) of the LED 14 and is electrically connected to an electric circuit. The specific structure of the control unit 15 is not particularly limited as long as the blinking state of the LED 14 can be controlled. For example, the control unit 15 is made of an IC or the like, and the surface is covered with rubber or the like for waterproofing.

  The press switch 16 switches the blinking state of the LED 14 by the control unit 15 when pressed, and is electrically connected to an electric circuit. In the small light, two pressing switches 16 are arranged on the outer peripheral portion of the circuit board 3 and at substantially equal angular intervals (that is, at positions facing each other by 180 °). In this way, by disposing the two push switches 16 on the outer periphery of the circuit board 3 at substantially equal angular intervals, the LED cover 4 is pushed in the axial direction of the casing 1 for switching the blinking state as will be described later. In this case, switching is possible even if the button is pushed slightly obliquely, and switch operability is further promoted. When a plurality of push switches 16 are provided, the flashing state by the control unit 15 is switched by the first signal from any of the push switches 16, and the next signal within a predetermined time from the first signal is ignored. Control is good.

  As shown in FIG. 6, the specific structure of the pressing switch 16 mainly includes a center contact 18, a peripheral contact 19, and a click spring 20. The central contact 18 is formed on the circuit board 3 and is electrically connected to the electric circuit. The peripheral contact 19 is formed on substantially the same circumferential track so as to be separated from the central contact 18 and is electrically connected to an electric circuit. The click spring 20 is made of a conductive elastic metal plate, is formed in a substantially circular dome shape (dish shape), and is configured to be reversed by pressing. The click spring 20 is disposed so that the outer edge portion thereof is on the peripheral contact 19. In the pressing switch 16 having such a structure, when the center of the click spring 20 is pressed, the click spring 20 is inverted to generate a click feeling. At the same time, the center lower surface of the click spring 20 contacts the center contact 18. Becomes conductive through the click spring 20 (ON). On the other hand, when the pressure on the click spring 20 is released, the click spring 20 automatically returns to its original shape while generating a click sensation, and the central contact 18 and the peripheral contact 19 are in a non-conductive state (off). By using the pressure switch 16 having such a structure, switching can be performed by lightly touching the LED cover 4, and a click feeling is imparted to the switching. As a result, switch operability is further promoted.

  The click spring 20 of the pressing switch 16 has a partial spherical recess 21 at the center. On the other hand, the flange portion 25 of the LED cover 4 to be described later has a convex portion 26 at a position that matches the concave portion 21 of the click spring 20 on the back surface thereof. Thus, by having the concave portion 21 in the center of the click spring 20 and the convex portion 26 that fits the concave portion 21 on the back surface of the flange portion 25 of the LED cover 4, switching due to pressing of the LED cover 4 is further simplified. In addition, as a result of ensuring a good contact state with the center contact by the convex portion formed on the back side of the click spring 20, the switching operability is further promoted.

  On the other hand, a battery contact that contacts one electrode (minus) of the battery 2 is provided on the back side of the circuit board 3. Further, the circuit board 3 is provided with a battery contact piece 23 that extends downward from the side thereof and contacts the other electrode (plus) of the battery 2. The battery contact and the battery contact piece 23 are electrically connected to an electric circuit.

  The LED cover 4 includes a transparent hemispherical dome portion 24 that covers the LED 14, and an annular flange portion 25 that extends outward from the bottom opening of the dome portion 24. The LED cover 4 is housed such that its flange portion 25 is disposed on the circuit board 3 in the casing 1 and its dome portion 24 projects from the opening 7 of the casing 1. Further, the dome portion 24 of the LED cover 4 is integrally formed with a convex lens portion 27 for condensing a light beam emitted from the LED 14 at a tip portion thereof. Furthermore, as described above, the flange portion 25 of the LED cover 4 has the convex portion 26 integrally formed at a position on the back surface thereof that matches the concave portion 21 of the click spring 20. In addition, semicircular recesses 28 are formed at substantially equal angular intervals on the outer edge portion of the flange portion 25 of the LED cover 4, and are formed at substantially equal angular intervals on the inner surface of the casing 1 (casing body 1a). The LED cover 4 is configured not to rotate in the casing 1 by fitting with a convex portion (not shown).

  As a material for forming the LED cover 4, transparent glass or synthetic resin is used, and synthetic resin is preferable from the viewpoint of weight reduction. Examples of the synthetic resin used as a material for forming the LED cover 4 include acrylic resin, acrylonitrile resin, polyurethane, polyvinyl chloride, polystyrene, polyacrylonitrile, polyamide and the like. Among them, acrylic resin having high transparency is preferable, and polymethyl Methacrylate (PMMA) is particularly preferred.

  The inner cover 5 includes a dome-shaped protruding portion 29 and a front wall 30 and a cylindrical portion 31 that extend downward from the bottom opening of the protruding portion 29. The inner cover 5 has a protruding portion 29 covering the outer surface of the dome portion 24 of the LED cover 4 protruding from the opening 7 of the casing 1, and the front wall 30 and the cylindrical portion 31 are the front wall 8 and the side wall of the casing 1. 9 is arranged so as to cover each.

  Since the protruding portion 29 of the inner cover 5 is disposed so as to cover the outer surface of the dome portion 24 of the LED cover 4 that houses the LED 14 serving as the light source, the thickness is preferably as thin as possible. Specifically, the lower limit of the thickness of the protruding portion 29 that is the coating thickness of the dome portion 24 of the LED cover 4 is preferably 0.1 mm, more preferably 0.2 mm, and even more preferably 0.3 mm. On the other hand, the upper limit of the thickness of the protruding portion 29 is preferably 1 mm, more preferably 0.8 mm, and even more preferably 0.5 mm. By setting the thickness of the protruding portion 29 in this way, the decrease in the amount of light can be minimized while maintaining sufficient strength and durability as the inner cover 5, and as a result, the light from the light source Can be efficiently transmitted and used. The thickness of the cylindrical portion 31 may be the same as or different from the thickness of the protruding portion 29, and the cylindrical portion 31 is preferably thicker than the protruding portion 29. As a minimum of the thickness of cylindrical part 31, 0.1 mm is preferred, 0.3 mm is more preferred, and 0.5 mm is still more preferred. On the other hand, the upper limit of the thickness of the cylindrical portion 31 is preferably 2 mm, more preferably 1.8 mm, and even more preferably 1.5 mm. By setting the thickness of the cylindrical portion 31 in this way, the inner cover 5 and the outer cover 6 described later are brought into close contact with each other by the elasticity of the cylindrical portion 31, and the waterproof property of the small light is further promoted. can do.

  The outer cover 6 has a waterproof part 32 and a pair of attachment pieces 33. The waterproof portion 32 is a flat bottomed cylindrical body having a circular opening 34 at the center of the surface, and is disposed so as to integrally cover the outer surface of the front wall 30 and the cylindrical portion 31 of the inner cover 5. The The pair of attachment pieces 33 are formed in a symmetrical ring shape, and extend from the bottom of the waterproof part 32 to the left and right sides.

  The bottom part 35 of the waterproof part 32 of the outer cover 6 is formed thicker than other parts (for example, side walls, front walls, etc.). By forming the bottom portion of the waterproof portion 32 thicker than the other portions in this way, the waterproof portion 32 is curved and the waterproof property is lowered even if the pair of attachment pieces 33 is pulled when the small light is attached to a handle or the like. Can be prevented. The average thickness of the bottom portion 35 of the waterproof portion 32 is preferably about 2 to 4 times the average thickness of other portions. By providing such a thickness difference, it is possible to effectively prevent a decrease in waterproofness due to the bending of the waterproof portion 32 described above.

  The inner cover 5 and the outer cover 6 are made of a homogeneous elastomer material. As such an elastomer material, rubber or thermoplastic elastomer is used. Examples of the rubber include natural rubber, polyisoprene, polybutadiene, styrene-butadiene copolymer, acrylonitrile-butadiene copolymer, ethylene-propylene-diene copolymer, ethylene-propylene copolymer, polychloroprene, isobutylene- An isoprene copolymer, silicone rubber or the like is used. Examples of the thermoplastic elastomer include styrene thermoplastic elastomer, olefin thermoplastic elastomer, ester thermoplastic elastomer, urethane thermoplastic elastomer, amide thermoplastic elastomer, and fluorine thermoplastic elastomer. Especially, as an elastomer material which forms the inner cover 5 and the outer cover 6, silicone rubber (including a silicone resin) is preferable. Such silicone rubber has good adhesion, deformability, sealing performance, heat resistance, weather resistance, and the like, and thus, by using silicone rubber as a material for forming the inner cover 5 and the outer cover 6, the inner cover can be obtained. 5 and the outer cover 6 are deformed flexibly in accordance with the shape of the member contained therein, and the waterproofness of the small light is drastically improved. In addition, weather resistance, heat resistance and the like are promoted.

  Moreover, it is preferable that the inner cover 5 and the outer cover 6 are overlapped so that the bonding surfaces of both are in a vacuum bonded state. In this way, the two members are placed so that no foreign matter such as air or water is interposed between the inner cover 5 and the outer cover 6, that is, between the inner cover 5 and the outer cover 6. By overlapping and closely contacting, moisture intrusion from between the inner cover 5 and the outer cover 6 is prevented, and as a result, moisture from the gap formed between the casing 1 and the dome portion 24 of the LED cover 4 is prevented. Intrusion can be prevented more effectively.

  In the small light including the above-described components, the LED cover 4, the circuit board 3, the two batteries 2, and the elastic body 13 are inserted in this order from the bottom opening of the casing body 1a, and the casing lid portion is inserted into the bottom opening of the casing body 1a. After fitting 1b, the protruding portion 29 of the inner cover 5 protrudes from the outer surface of the dome portion 24 of the LED cover 4 protruding from the opening 7 of the casing body 1a, and the front wall 30 and the cylindrical portion 31 correspond to the front wall 8 of the casing 1 and The inner cover 5 is disposed so as to cover the side walls 9, and the outer cover 6 is further covered with the inner cover 5 so that the waterproof portion 32 of the outer cover 6 integrally covers the front wall 30 and the cylindrical portion 31 of the inner cover 5. It arranges on the outside. By assembling the above-described components in this way, a complete body as shown in FIG. 2 is obtained.

  Note that the small light includes an engagement piece 36 in addition to the pair of attachment pieces 33 of the outer cover 6 in order to be attached to the attachment target X. The engagement piece 36 is a plate-like body whose section is curved in an S-shape, and is configured such that a pair of attachment pieces 33 are hung on both curved portions. Moreover, it does not specifically limit as a forming material of the engagement piece 36, For example, synthetic resins, such as polyamide, are preferable.

  As shown in FIG. 4, the small light is attached by pulling the pair of attachment pieces 33 of the outer cover 6 having flexibility and stretchability and winding the attachment pieces X such as a cylinder to the engagement pieces 36. By engaging, it can be easily and reliably attached to the attachment target X. Therefore, the small light can be easily and reliably attached to various places having different diameters and shapes such as a handle of a motorcycle, a cane, a body such as a finger / arm.

  Further, the small light is mounted on the outer peripheral portion of the circuit board 3 so that the pair of pressing switches 16 contacts the flange portion 25 of the LED cover 4 (particularly, the convex portion 26 on the back surface of the flange portion 25). The LED cover 4 protruding to the side of the casing 1 is pressed in the axial direction of the casing 1 so that the blinking state can be switched and has a very high switch operability. In particular, when it is attached to a handle or a cane of a two-wheeled vehicle such as a bicycle for lighting, it is not necessary to slide a switch on the side of the body like a conventional portable light, and the LED cover 4 on the front is manually moved. By tapping, it becomes possible to switch the blinking state, and the operation of the switch becomes very simple and reliable.

  In addition, as described above, the LED light is used instead of the LED cover 4 for the small light, and individual switches such as a conventional portable light are omitted, or a flat battery 2 such as a coin-type battery is used. In addition, since the LED 14 is housed in the LED cover 4 protruding from the casing 1, the main body portion which is a lighting device becomes very compact, and the overall size and weight reduction and portability are greatly improved. Yes.

  Furthermore, the compact light is not only greatly reduced in size and weight and portability, but also has an excellent waterproof structure. The waterproof structure of the small light includes an inner cover 5 and an outer cover 6. As shown in FIG. 3, the separate part in the waterproof structure of the small light is a dome part 24 of the LED cover 4, and the inner cover 5 is a surface of the casing 1 and the outer surface (not shown) of the dome part 24 of the LED cover 4. The outer cover 6 covers the wall 8 (not shown) and the side wall 9 (not shown) integrally, and further covers the surface wall 8 and the side wall 9 of the casing 1 from above the inner cover 5. It is arranged. The length of the cylindrical portion 31 of the inner cover 5 is not particularly limited, but it is preferable to set so that the side wall 9 of the casing 1 can be covered more widely, and to set the side wall 9 of the casing 1 to the skirt. More preferred. By covering the side wall 9 of the casing 1 more widely in this way, the contact area between the inner cover 5 and the outer cover 6 is increased, and moisture intrusion between the inner cover 5 and the outer cover 6 is more effective. Can be prevented.

  In the waterproof structure of the small light, the inner cover 5 and the outer cover 6 are made of a homogeneous elastomer material. Since the elastomeric material is flexible and stretchable, when the inner cover 5 and the outer cover 6 are overlapped with each other, both members are deformed and closely adhered along the shape of the member to be included, and the gap generated between the members is effective. Can be sealed. Thus, since the bonding surfaces of both members are in a so-called vacuum bonding state, it is possible to more effectively prevent water from entering through the gap between the inner cover 5 and the outer cover 6, and as a result, the casing 1. It is possible to more effectively prevent water from entering the gap between the two and the separate body part. Further, the waterproof structure of the small light is simple in this way, and it is not necessary to take special waterproof measures such as an O-ring, so that it can be manufactured in large quantities at a low cost.

  In addition, the waterproof structure of the small light of this invention is not limited to the said embodiment. For example, the separate part disposed in the opening of the casing is not limited to the dome portion of the LED cover, and may be a switch button or the like that is placed in substantially the same plane as the opening surface of the casing. Further, the number of batteries is not limited to the above two, and may be one or three or more. Further, the coupling means between the casing main body and the casing lid portion in the casing is not limited to the above-described concave-convex fitting structure, and may be a means such as screwing. A plurality of LEDs may be arranged on the circuit board. The structure of the press switch is not particularly limited as long as it can be switched by pressing, and for example, a structure using a spring spring is appropriately employed. Further, the number of push switches is not limited to the above two, and may be one or three or more. The ease and certainty of switching are further improved by disposing three or more push switches at substantially equal angular intervals on the outer periphery of the circuit board.

  As described above, the waterproof structure of the small light of the present invention has a simple structure and has extremely high waterproof properties. In addition, the compact light that adopts the waterproof structure not only promotes compactness, simplification of the structure, weight reduction, sealing of the outer surface, portability, wearability and switch operability, but also the waterproof structure described above. By adopting, it is extremely excellent in waterproofness. Thereby, it is useful as a portable lighting device requiring waterproofness, and can be suitably used particularly in an environment where it is easy to touch water such as a headlamp such as a bicycle, trekking, mountain climbing, diving and the like.

DESCRIPTION OF SYMBOLS 1 Casing 1a Casing main body 1b Casing cover part 2 Battery 3 Circuit board 4 LED cover 5 Inner cover 6 Outer cover 7 Opening 8 Front wall 9 Side wall 10 Groove part 11 Projection part 12 Notch part 13 Elastic body 14 LED
DESCRIPTION OF SYMBOLS 15 Control part 16 Press switch 17 Support 18 Center contact 19 Peripheral contact 20 Click spring 21 Concave part 22 Concave part 23 Battery contact piece 24 Dome part 25 Flange part 26 Convex part 27 Convex lens part 28 Concave part 29 Projection part 30 Front wall 31 Cylindrical part 32 Waterproof Part 33 Attachment piece 34 Opening 35 Bottom part 36 Engagement piece X Attachment object

Claims (6)

A structure for waterproofing a gap between a casing and a separate part in a small light having a casing having an opening and a separate part disposed in the opening,
An inner cover covering the outer surface of the separate part and the front wall and side wall of the casing;
An outer cover that covers the outer surface of the casing other than the opening,
A waterproof structure for a small light, wherein the inner cover and the outer cover are formed of a homogeneous elastomer material.   The waterproof structure for a small light according to claim 1, wherein the inner cover and the outer cover are overlapped in a vacuum bonding state.   The waterproof structure for a small light according to claim 1, wherein the elastomer material is silicone rubber. A flat bottomed cylindrical casing having a circular opening in the center of the surface;
A flat battery housed on the bottom side in the casing;
A disc-shaped circuit board that is mounted and housed on the surface side of the battery in the casing, and that has an LED, a control unit that controls the blinking state of the LED, and a pressure switch that switches the blinking state of the LED by the control unit on the surface side When,
A transparent dome covering the LED and an annular flange extending outward from the bottom opening of the dome; the flange is disposed on the surface side of the circuit board in the casing; An LED cover stored so as to protrude from the opening;
The waterproof structure according to claim 1, claim 2 or claim 3,
The press switch is disposed on the outer peripheral portion of the circuit board so as to contact the flange portion of the LED cover,
A compact light configured such that a separate part of the waterproof structure is a dome part of the LED cover, and the gap between the casing and the dome part of the LED cover is waterproofed.   The small light according to claim 4, wherein a covering thickness of a dome portion of the LED cover in the inner cover is 0.1 mm or more and 1 mm or less.   The small light according to claim 4 or 5, wherein the outer cover has a pair of annular mounting pieces extending to the left and right.

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