JPH09121392A - Transmitter - Google Patents

Abstract

PROBLEM TO BE SOLVED: To miniaturize the whole transmitter and to make it possible to use a battery of large size by providing a lower case with a groove to which an O ring is to be inserted and a recessed part with which the projected part of a battery cover is to be engaged. SOLUTION: An O ring 48 is inserted into the groove formed on the lower case 31 and a coin type battery 27 is engaged with the O ring 48 from the bottom side of the case 31. The projected part 45 of the battery cover 41 is engaged with the engaging recessed part 52 formed on the outside of the groove of the case 31 so that the engaged battery 27 is fixed through the O ring 48 and a screw 50 is clamped from a screw hole 51 formed on the cover 41 to a screwing part formed on the outside of an waterproof internal rib 35 to screw the cover 41. In the constitution, the thickness of the cover 41 can be reduced and the transmitter can be miniaturized. Since the battery 27 of large size can be used, the life of the battery 27 can be improved.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a transmitter mainly used for remote control of opening and closing a door lock of a vehicle.

[0002]

7 to 9 show the construction of a conventional transmitter of this type. FIG. 7 is an exploded perspective view of a conventional transmitter, and FIG. 8 is a side sectional view of the same transmitter. 9 is a plan view of an electrode portion of the transmitter.

In the figure, 1 is a printed wiring board,
A logic IC 2 that outputs a transmission code, a chip-type light touch switch 3, a chip tantalum capacitor 4, a resistor, a transistor, a ceramic capacitor, and the like (not shown) are mounted on the printed wiring board 1. Reference numeral 5 is an infrared light emitting diode soldered to the front surface of the printed wiring board 1, and 6 is an infrared light emitting diode 5
Is a visible light emitting diode soldered next to. 7
Is an upper case, an elastic operation portion 8 is attached to a central hole, and the printed wiring board 1 is housed inside the lower case 1
It is fixed to 0. Visible light and infrared ray transmitting lenses 11 are adhered to the front surfaces of the upper case 7 and the lower case 10, and the lenses 11 are semitransparent so that the light emission of the visible light emitting diodes 6 can be confirmed.

A positive electrode 12 and a negative electrode 13 are soldered to the back surface of the printed wiring board 1, and a coin type lithium battery 14 (capacity 35 mAh) having a diameter of 12 mm is assembled so as to contact each electrode. ing. Reference numeral 15 denotes a battery cover, which has a hooking portion 16 protruding in a direction perpendicular to the cover surface. The lower case 10 is provided with a circumferential groove 17, and the battery cover 15 is provided inside.
A hooking portion 18 is provided corresponding to the hooking portion 16.
Reference numeral 19 denotes an O-ring, which is inserted into the circumferential groove 17 so that the hook portion 16 of the battery cover 15 is fitted into the hook portion 18 of the lower case 10 and is tightened with the screw 20 so that waterproofness can be ensured. Was configured.

[0005]

However, in the conventional transmitter described above, it is necessary to make the size as small as possible for portable use, but in the conventional transmitter described above,
In addition, since the hook portion 18 of the lower case 10 is provided inside the O-ring 19 in order to ensure the waterproofness of the transmitter, the hook portion 16 protruding vertically to the surface of the battery cover 15 is provided. Since the battery cover 15 and the transmitter as a whole cannot be thinned, this hinders size reduction and requires a space for the hanging portion 18 inside the O-ring 19 so that the battery 14 has a large size. However, there is a problem in that the signal reachable distance is short and the battery life is short.

Secondly, the infrared light emitting diode 5 has a structure.
Since only one can be used, there is a problem that the signal reach distance is short. Even if two capacitors can be used, there is a problem that the power supply voltage drops because a large electrolytic capacitor cannot be used for power supply compensation, and the transmission circuit does not operate.

Third, the conventional transmitter uses the logic IC 2 which can handle only a simple transmission code.
Although the operation was stable, in order to enhance security, it is necessary to adopt a microcomputer capable of creating a complicated transmission code. At this time, the coin-type lithium battery 1
In a battery with a small capacity such as 4, the voltage may drop below the operating voltage of the microcomputer,
As a result, the microcomputer may go into a runaway state and may not recover. Therefore, conventionally, there has been a problem that a reset circuit (reset IC) and a reset switch must be added and used, which is an obstacle to downsizing and cost reduction.

The present invention solves such conventional problems,
It is an object of the present invention to provide a small size, good performance, and inexpensive transmitter.

[0009]

In order to solve the above problems, a transmitter according to the present invention is provided with an opening hole in a part of the bottom surface thereof, and an O-ring made of an elastic body on the bottom surface side of the inner peripheral edge of the opening hole. Is attached to the flat part and the lower case with an open top that is provided with a recess for engagement in which a notch-shaped cavity is formed from a part of the flat part toward the outer peripheral direction, and a circuit component including an infrared light emitting diode. A printed wiring board housed in the lower case, an upper case having a pressing operation portion on the upper surface and coupled to the upper surface of the lower case, and an engaging recess fitted in an engaging recess provided in the lower case. Is provided on a part of the outer periphery and a flat surface portion is provided to which the O-ring is closely attached, and the bottom surface of the lower case is fixed so that the coin-shaped battery fitted from the bottom surface side of the lower case is fixed through the O-ring. Screw into the open hole of It is obtained by a configuration consisting of fit combined battery cover.

According to the present invention, since the battery cover can be made thin, the transmitter can be downsized and the battery size can be increased, so that the signal reach of the transmitter and the battery life can be improved.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The invention according to claim 1 of the present invention is a flat surface in which an open hole is provided in a part of the bottom surface and an O-ring made of an elastic material is closely attached to the bottom surface side of the inner peripheral edge of the open hole. Section and a lower case having an open upper surface provided with a concave portion for engagement in which a cavity having a cutout shape is formed from the part of the flat surface portion toward the outer peripheral direction, and the lower case having circuit components including an infrared light emitting diode mounted thereon. A printed wiring board housed therein, an upper case having a pressing operation portion on the upper surface and coupled to the upper surface of the lower case, and an engaging convex portion that fits into an engaging concave portion provided in the lower case. In addition to being provided on a part of the outer circumference, a flat surface portion to which the O-ring is closely attached is provided, and the coin-shaped battery fitted from the bottom surface side of the lower case is fixed to the open hole on the bottom surface of the lower case through the O-ring. Battery cover combined with screws Are those that were to consist of configuration,
Since the battery cover can be made thin, it has the effects of downsizing, increasing the battery size, and improving the signal reach of the transmitter and the battery life.

According to a second aspect of the present invention, two infrared light emitting diodes are arranged in parallel, and an electrolytic capacitor is horizontally arranged between the two infrared light emitting diodes, and It is configured to use a printed wiring board in which a chip-type visible light emitting diode is arranged at a position between the electrolytic capacitor and a pressing operation portion provided substantially in the center of the upper case. This has the effect of improving the reaching distance.

According to a third aspect of the present invention, the electrolytic capacitor has a characteristic that the impedance at -40 ° C. is less than twice the impedance at + 20 ° C., and it is possible to prevent the power supply from dropping. It has the effect of being able to.

According to a fourth aspect of the present invention, when the microcomputer for outputting the transmission code is mounted on the printed wiring board and the polarity of the battery is inserted in the opposite direction, the power supply circuit is short-circuited through the conductive portion of the battery. The microcomputer is configured to be reset, and has an effect of simplifying the configuration and reducing the size of the printed wiring board.

According to a fifth aspect of the present invention, a positive electrode that elastically contacts the positive electrode of the battery is provided with a hooking portion that contacts the flat surface of the battery.
The hooking amount of the hook portion is smaller than half the difference between the outer diameter of the battery and the outer diameter of the negative electrode of the battery.
It has an effect that the battery can be held without closing the battery cover.

Hereinafter, an embodiment of the present invention will be described with reference to FIG.
This will be described with reference to FIG. (Embodiment) FIG. 1 is an exploded perspective view of a transmitter according to the embodiment, FIG. 2 is a perspective view of the transmitter with a battery cover removed, and FIG. 3 is an internal plan view of the transmitter. Is a side sectional view of the transmitter, FIG. 5A is a plan view of an electrode portion of the transmitter,
5B is a side view showing a state where the battery is properly inserted into the electrode portion, FIG. 5C is a side view showing a state where the battery is inserted into the electrode in the opposite direction, and FIG. 6 is a circuit of the transmitter. It is a figure.

In the figure, 21 is a printed wiring board,
A one-time microcomputer 22 that outputs a transmission code in which a part of the transmission code is changed for each transmission and a chip type light touch switch 23 are provided on the printed wiring board 21.
And a chip type visible light emitting diode 24 and a resistor,
Transistors, ceramic capacitors, etc. (not shown)
Has been implemented. Reference numerals 25 and 26 denote infrared light emitting diodes, respectively, which have a half-value angle (angle from the front, which is half the irradiation intensity at the front, which is half the irradiation intensity at the front) of 15 ° or less on the right side of the printed wiring board 21 for narrow directivity and for long distances. Of the infrared light emitting diode 25 of FIG.
Are placed and soldered.

The transmitter is a coin-type lithium battery (hereinafter referred to as a battery) 27 (capacity 210 mA) with a diameter of 20 mm.
Since h) is used, the capacity is smaller than that of an AA battery or the like, and if a current of about 500 mA is applied during transmission, the power supply voltage drops and the device does not operate. Therefore, an aluminum electrolytic capacitor (hereinafter referred to as an electrolytic capacitor) 28 is added for power source compensation. At this time, the electrolytic capacitor 28
Has a characteristic that the impedance at −40 ° C. under the condition of 120 Hz is not more than twice the impedance at + 20 ° C., so the impedance does not become high even at low temperatures, and the voltage drop is 1.30 even at −30 ° C. A value of 8V can be secured and excellent transmission performance can be obtained. The electrolytic capacitor 28 is soldered to the protruding portion 29 of the printed wiring board 21, and the infrared light emitting diode 2 having a wide directivity in order to secure the directivity as much as possible.
It is placed horizontally from 6 and is trying to miniaturize.
Further, since the size of the electrolytic capacitor 28 uses the space between the two infrared light emitting diodes 25 and 26, φ6.3.
It is possible to adopt up to mm diameter and increase the capacity,
The cost can be reduced as compared with the case of using an expensive chip type tantalum capacitor. In addition, the chip-type visible light emitting diode 24 is provided between the light touch switch 23 and the electrolytic capacitor 28 to achieve further compactness.

Reference numeral 30 denotes an upper case, 31 denotes a lower case, in which a printed wiring board 21 on which electronic components of a transmission circuit (FIG. 6) are mounted is housed. An operation part 32 having a hinge structure is provided on the upper case 30, a window 33 is provided so that light emission of the visible light emitting diode 24 can be confirmed, and a sheet 34 is attached thereon. An inner rib 35 for ultrasonic welding is provided on the lower case 31 formed of an infrared transparent resin, and the printed wiring board 21
Is housed and ultrasonically welded to the upper case 30 to ensure waterproofness.

On the back surface of the printed wiring board 21, the + electrode 3
6, 37 and-electrode 38 are soldered from the opposite surface and are configured to contact the battery 27. The + electrodes 36 and 37 are symmetrical, and have a hook 40 at the tip of the spring 39 to prevent the battery 27 from jumping out. In general, when a microcomputer is adopted, when the power supply voltage becomes lower than the operating voltage of the microcomputer, the possibility is very low but runaway may occur, and the operation may not be restored. Therefore, as a countermeasure, a reset IC may be incorporated in the circuit or a reset switch may be provided on the circuit. However, addition of these causes an obstacle to cost reduction and miniaturization. Therefore, in the present embodiment, the circuit diagram shown in FIG. 6 is used, and in the unlikely event that the one-time microcomputer 22 runs out of control, the battery 27 stored as shown in FIG. 5B is shown in FIG. 5C. , The power supply circuit is short-circuited through the conductive part of the battery 27, and the one-time microcomputer 2
2 can be reset.

At this time, the battery 27 is held by the hook portion 40 without closing the battery cover 41, and the battery 27 can be immediately returned to the normal state. Further, since the hooking amount 42 of the hooking portion 40 is smaller than the half size 43 of the difference between the outer diameter of the battery 27 and the-electrode diameter, the battery 27 has an adverse effect such as a short circuit when the battery 27 is inserted reversely. There is no. The + electrodes 36 and 37 are two symmetrical parts, and contact can be made at two or more places.
By providing the cut-and-raised portions 44 at three places, the stability of contact is enhanced.

Reference numeral 41 denotes a battery cover, which has a convex portion 45 projecting laterally at an end thereof, and the convex portion 45 is configured to be fitted in the concave portion 46 of the lower case 31. .
Reference numeral 47 is a groove provided in the lower case 31, and an O-ring 48 made of rubber, which is an elastic body, is inserted into the groove 47 and is compressed by the flat surface portion 49 of the battery cover 41.
The watertightness is ensured by tightening with a screw 50 on a screw tightening portion provided on the outer side of the waterproof inner rib 35.
At this time, the screw tightening holes 51 are located substantially opposite to the convex portions 45 with the battery sandwiched therebetween, and the O-ring 48 is evenly compressed. Further, by cutting a part of the side wall of the groove 47 to provide the recess 52, it is possible to directly touch the side surface of the battery, which facilitates replacement of the battery 27 and
A large battery size can be secured near the O-ring 48,
Moreover, since it can be made thin, it is possible to adopt a size of φ20 mm and a thickness of 3.2 mm in the battery exchange system having the battery cover 41. When the battery size is increased, the battery capacity and the amount of outflow current can be increased, so that the signal reaching distance and the service life can be improved.

[0023]

As is apparent from the above embodiment, the present invention makes it possible to reduce the size of the transmitter and at the same time improve the signal reach and the battery life.

Furthermore, since there is no need for a reset circuit or a reset switch in the circuit, there is an effect that a compact and inexpensive transmitter can be provided.

[Brief description of the drawings]

FIG. 1 is an exploded perspective view of a transmitter according to an embodiment of the present invention.

FIG. 2 is a perspective view of the transmitter with a battery cover removed.

FIG. 3 is a plan view of the transmitter without the upper case.

FIG. 4 is a side sectional view of the transmitter.

5A is a back view of a printed wiring board of the transmitter, FIG. 5B is a side view when a battery is properly inserted in the electrode, and FIG. 5C is a side view when a battery is inserted in the electrode in the opposite direction.

FIG. 6 is a circuit diagram of the transmitter.

FIG. 7 is an exploded perspective view of a conventional transmitter.

FIG. 8 is a side sectional view of the transmitter.

FIG. 9 is a plan view of an electrode part of the transmitter.

[Explanation of symbols]

 21 printed wiring board 22 one-time microcomputer 23 light touch switch 24 visible light emitting diode 25 infrared light emitting diode (directivity narrow and long distance) 26 infrared light emitting diode (directivity wide and medium distance) 27 battery 28 electrolytic capacitor 30 upper case 31 Lower Case 32 Operation Part 33 Window 34 Seat 35 Inner Rib 36 + Electrode 37 + Electrode 38-Electrode 39 Spring Part 40 Hooking Part 41 Battery Cover 42 Engagement 43 Half Dimension of Difference between Battery Outer Diameter and Electrode Diameter 45 Convex Part 46 Recessed part 47 Groove 48 O-ring 49 Flat part 50 Screw 51 Screw tightening hole 52 Recessed part

Claims (5)

[Claims] 1. An open hole is provided in a part of the bottom surface, and a flat surface portion to which an O-ring made of an elastic material is in close contact with the bottom surface side of the inner peripheral edge of the open hole and a part of the flat surface portion toward the outer peripheral direction. A lower case with an open upper surface provided with a recess for engagement in which a notch-shaped cavity is formed, a printed wiring board housed in the lower case with circuit components including an infrared light emitting diode mounted, and a pressing operation on the upper surface An upper case joined to the upper surface of the lower case and a convex part for engagement fitted in a concave part for engagement provided in the lower case on a part of the outer circumference, and the O-ring is in close contact A coin-type battery fitted with a flat surface is inserted from the bottom side of the lower case.
A transmitter that consists of a battery cover that is screwed into the open hole on the bottom of the lower case so that it can be fixed via a ring. 2. The two infrared light emitting diodes are arranged in parallel, and an electrolytic capacitor is arranged horizontally between the two infrared light emitting diodes, and the electrolytic capacitor and the upper case are arranged in parallel. 2. The transmitter according to claim 1, wherein a printed wiring board having a chip-type visible light emitting diode arranged at a position between the pressing operation section provided substantially at the center is used. 3. The transmitter according to claim 2, wherein the electrolytic capacitor has a characteristic that the impedance at −40 ° C. is less than twice the impedance at + 20 ° C. 4. A structure in which a microcomputer for outputting a transmission code is mounted on a printed wiring board, and when the polarity of the battery is inserted in the reverse direction, the power supply circuit is short-circuited through the conductive portion of the battery to reset the microcomputer. The transmitter according to any one of claims 1 to 3. 5. A positive electrode that elastically contacts the positive electrode of the battery is provided with a hooking portion that comes into contact with the flat surface of the battery, and the hooking amount of this hooking portion is defined as the difference between the outer diameter of the battery and the outer diameter of the negative electrode of the battery. 5. The transmitter according to claim 1, which is smaller than half.