JPH064383Y2 - LED mounting structure on instrument dial - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial application] The present invention relates to a structure for mounting an LED on an instrument dial.

[Problems to be solved by conventional techniques and devices]

An example of the conventional structure will be described with reference to FIGS.

FIG. 8 is a front view of a conventional structure, FIG. 9 is a sectional view of an LED case portion, and FIG. 10 is a sectional view of an LED holder portion. This structure is devised for the purpose of eliminating the difficulty of the mounting work when the LED is directly adhered and fixed to the printed wiring board or the leads of the LED are directly soldered to the wiring board, and the complexity of the parts replacement work. In this case, the holder for holding the LED and the case for holding the holder and having the connection portion with the external wiring can be separated.

That is, the LED case 1 has a pin 2 inside, the pin 2 is soldered to the external lead wire 3, and the case itself is adhesively fixed to the substrate 4 with an adhesive. On the other hand, the LED holder 5
Holds the LED 6 at one end by inserting the respective leads 6a of the LED into the two holes 5a, and the terminal plate 7 previously mounted in the holder 5 is in contact with the leads 6a.
When such an LED holder 5 is fitted in the LED case 1, the terminal portion 2a of the pin 2 comes into contact with the terminal plate 7, so that L
The ED 6 becomes conductive with the external circuit.

However, in the above example, the workability is not good because the external lead wire 3 and the lead 6a of the LED 6 are connected by soldering. Also, stress is easily applied to the leads 6a during soldering,
The lead portion may be damaged, and some treatment is required to prevent contact between the connecting portions of the leads.

The present invention has been made in view of the above points, and an object thereof is to provide an LED mounting structure having good LED mounting workability, reliable connection, and high reliability.

[Means for solving problems]

In order to achieve the above object, the LED mounting structure for an instrument character, which is made according to the present invention, is integrally molded in a cylindrical shape with a light-shielding material and has a ring-shaped groove in the outer circumference near one end and the inner circumference in the center. Is formed on the dial, the LED case is attached to the dial by inserting it from the back side into the hole provided in the dial, and fitting the ring-shaped groove of the outer periphery near the end to the inner edge of the hole. And a partition wall divided into two parts by partition walls is formed inside the cylindrical wall, and a retaining piece is locked in a recess formed in each partition wall so that the terminal member is formed. An external lead wire that is held and connected to the terminal member is drawn out from one side of the partition part, and a ring-shaped projection is formed on the outer periphery of the substantially central part, and is inserted into the LED case from the dial plate back side. A ring-shaped projection is fitted in the ring-shaped groove on the inner circumference of the central portion. And an LED holder detachably attached to the LED case, an LED main body and two leads extending from the main body, and the leads are inserted from the other side in the partition portion of the LED holder to provide an internal terminal member. And an electrical connection between the LED holder and the main body held at one end of the LED holder.
With the holder attached to the LED case, the main body of the LED projects from the end of the LED case to the front side of the dial.

[Action]

With the above configuration, when mounting the LED on the instrument dial, first insert the LED case into the hole of the dial from the back side, and fit the outer ring-shaped groove near the end to the inner edge of the hole. And attach the LED case to the dial.

Next, the terminal member is held in each partition formed by the partition wall divided into two parts inside the LED holder, and the LED lead is inserted into the partition of the LED holder to make contact with the internal terminal member. Then, the main body is held at one end of the LED holder while being electrically connected.

After that, an LED holder holding this LED is inserted into the LED case from the back side of the dial plate, and a ring-shaped projection is fitted in a ring-shaped groove on the inner periphery of the central portion of the LED holder, whereby the LED holder is detachably attached to the LED case. be able to.

In this mounted state, the main body of the LED held by the LED holder protrudes from the end of the LED case to the front side of the dial, so by pushing this main body, the ring-shaped groove on the inner circumference of the central part of the LED case is pushed. And LED
The fitting with the ring-shaped projection of the holder is removed.

〔Example〕

 1 to 4 are views of respective parts constituting the embodiment.

FIG. 1 shows a terminal member 8 fixed by caulking to the end portion of the external lead wire 3 and made of a conductive metal.
As shown in (1), the retaining piece 8a is provided on one side.

FIG. 2 shows an LED holder 5, which is integrally molded of black synthetic resin having a light-shielding effect, the inside of the cylinder is divided by a partition wall 5b, and the terminals are provided on one side of both partition parts. A recess 5c for locking the retaining piece 8a of the member 8 is provided, and a ring-shaped projection 5d is provided on the entire outer circumference.

FIG. 3 is a front view of the LED 6, which is the light emitting unit.
Two leads 6a serving as an anode and a cathode are formed in an appropriate length at the end of the body 6b.

FIG. 4 is a cross-sectional view of the LED case 1, which is integrally molded in a cylindrical shape with a light-shielding synthetic resin material, and has a ring around one end and an inner circumference of the central part. Grooves 1a and 1b, respectively, and both end portions are provided with axially divided grooves 1c and 1d at four positions in the circumferential direction at equal intervals.

FIG. 5 is a cross-sectional view of this embodiment after assembly. The dial 9 is formed by adhering a printing plate 9a such as letters and scales and a light guide plate 9b for illumination, and has a case mounting hole 9c. The groove 1a on the outer circumference of the LED case 1 is fitted in the case mounting hole 9c.

The LED holder 5 and the LED 6 are housed in the LED case 1, and the protrusion 5d on the outer periphery of the LED holder 5 is LE.
The two are joined by fitting in the groove 1b of the D case 1, and the LED
The LED main body 6b in which the leads 6a are inserted into the compartments of the holder 5 is partially exposed from one end of the LED case 1 to the outside.

The terminal member 8 of the external lead wire 3 is inserted into each partition of the LED holder 5, and the retaining piece 8a is locked in the recess 5c and is brought into contact with the leads 6a of the LED to be electrically connected.

6 and 7 are for explaining the LED mounting work.
First, as shown in FIG. 6 (a), L is previously placed in the hole 9a of the dial 9.
The ED case 1 is fitted, while the lead 6a of the LED 6 is inserted into the LED holder 5 as shown in FIG. 7, and the terminal member 8 and the LED 6 are mounted on the LED holder 5 as shown in FIG. 6 (b). Prepare a unit such as
It is inserted and fitted in the LED case 1 from the direction of the arrow in the figure. In this attached state, as shown in FIG. 5, the main body 6b of the LED 6 projects from the end of the LED case 1 to the front side of the dial 9, so that when the LED needs to be replaced, the projecting main body By pushing 6b in the opposite direction to the insertion direction, the LED case 1
It can be removed together with the ED holder 5. At this time, L
Since the split groove 1d is formed at the end of the ED case 1,
The LED holder 5 can be attached and detached smoothly.

In the above embodiment, the illumination of the dial 9 is performed from a separately provided light source via the light guide plate 9b as usual. At this time, the LED holder 5 and LE, which are light-shielding, are behind the LED.
Since it is covered by the D case 1, the light for illuminating the dial does not sneak into the LED from behind, and LE
The light of D does not go around on the dial. Therefore, the visibility of the LED display on the dial 9 can be improved.

[Effect of device]

As described above, according to the present invention, the LED on the dial is
Since mounting of the case, holding of the LED in the LED holder, and mounting of the LED holding the LED in the LED case are performed by fitting, it is possible to obtain the necessary electrical power without soldering the LED lead and the external lead wire. The connection can be made. In addition, since it protrudes to the dial plate front side of the LED body, by pushing this part, LE
It is also possible to remove the LED holder and the LED from the D case.

Therefore, the workability of assembling and dismounting the LED holder holding the LED is improved, and since the handling at the time of work is performed in LED holder units, there is no risk of giving stress to the leads and damaging the leads. Since the connecting portion of the LED lead is inside the holder, it is possible to obtain an effect that no special contact prevention processing is required.

[Brief description of drawings]

1 to 4 are structural diagrams of respective constituent parts of the embodiment of the present invention, and FIG.
FIG. 6 is a sectional view of the embodiment of the present invention after assembly, FIGS. 6 and 7 are explanatory views of the assembly work of the embodiment, FIG. 8 is a front view showing the structure of the conventional example after assembly, and FIG. FIG. 10 is a cross-sectional view showing the relationship between a conventional LED case and a substrate, and FIG. 10 is a cross-sectional view showing the relationship between a conventional LED holder and an LED. DESCRIPTION OF SYMBOLS 1 ... LED case, 1a, 1b ... Ring-shaped groove, 3 ... External lead wire, 5 ... LED holder, 5b ... Partition wall, 5c ... Recess, 5d ... Ring-shaped projection, 6 ... LED, 6a ... Lead, 6b ... LED body, 8 ... terminal member, 8a ... retaining piece, 9 ... dial, 9c ... hole.

Claims (1)

[Scope of utility model registration request] 1. A light-shielding member is integrally molded in a cylindrical shape, and a ring-shaped groove is formed in an outer periphery near one end and an inner periphery of a central portion and is inserted into a hole provided in a dial from the back side thereof. The LED case is attached to the dial by fitting the ring-shaped groove around the end to the inner edge of the hole, and is integrally molded into a tubular shape with a light-shielding material, and the partition wall is inside the tubular shape. A partition section divided into two parts is formed, and the retaining member is retained in the recess formed in each partition section to hold the terminal member, and the external lead wire connected to the terminal member is connected to the partition section. A ring-shaped protrusion is drawn out from one side and is formed on the outer periphery of the substantially central portion, and is inserted into the LED case from the back side of the dial plate, and the ring-shaped protrusion is fitted in the ring-shaped groove of the inner periphery of the central portion. LED holder that is attached and detachably attached to the LED case , Having an LED body and two leads extending from the body,
The lead is inserted from the other side into the partition of the LED holder, is in contact with an internal terminal member and is electrically connected to the LED holder, and the main body is held at one end of the LED holder. An LED mounting structure for an instrument dial, wherein the main body of the LED projects from the end of the LED case to the front side of the dial in a state of being attached to the LED case.