JPH11224752A - Light source device and display device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To simplify the molding property of a socket body and reduce the cost, and to prevent the wrong assembling of polarity by arranging a circuit board substantially on the same axis as the axis of a light source having a polarity, and electrically connecting them to each other. SOLUTION: In this light source device, at least base end part 14a of an LED(light emitting diode) 14 and a flat circuit board 15 for lighting the LED 14 are inserted and fixed to the insert hole of a socket body. The LED(light source) 14 is fixed to the circuit board 15 on its axial central axis Cd. Namely, semicircular curved parts 23a, 24a are formed on a pair of axially juxtaposed lead frames 23, 24 so as to be curved orthogonally outward from the axial central axis Od, the tip parts are inserted into a pair of mounting holes 15a, 15b of the circuit board 15, and the inserted tips protruded to the reverse side are fixed by a solder fillet 25, whereby the LED 14 is arranged concentrically on the circuit board 15 and electrically connected thereto.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a light source device and a display device suitable for a lamp for illuminating an in-vehicle meter, a warning light, and the like.

[0002]

2. Description of the Related Art Conventionally, as an example of a socket for a display lamp such as an on-vehicle meter or a warning light, for example, Japanese Utility Model No. 7-220
A lamp socket described in Japanese Patent Application Publication No. 68 (hereinafter referred to as Conventional Technology 1) and a light emitting diode assembly described in Japanese Utility Model Application Publication No. 6-17326 (hereinafter referred to as Conventional Technology 2) are known.

In the prior art 1, a lamp socket equipped with an incandescent lamp is inserted into an insertion hole of a printed circuit board, and the lamp socket is mounted on the printed circuit board.
Since the light source is an incandescent lamp, there are various problems in life, brightness, temperature, and the like, and there is a problem that it is difficult to realize maintenance-free.

On the other hand, the prior art 2 uses a light-emitting diode (hereinafter, referred to as an LED) having a long life, high brightness, and excellent cold resistance and heat resistance as a light source. it can.

Since the LED has polarity, this L
When assembling a pair of contact terminals to the lighting circuit board to which the ED is attached, a step-like step portion is provided in the width direction at the tip of a pair of strip-shaped lead pieces of these contact terminals so that the polarity is not mistaken. The left and right sides are formed to be opposite to each other and have different sizes, while the sizes of a pair of mounting holes of the lighting circuit board into which the tip ends of the lead pieces are inserted are also different.

[0006]

However, in the prior art 2 described above, in accordance with the polarity of the LED, a stepped portion is formed at each tip of a pair of fine lead pieces of the contact terminal by inverting left and right. Therefore, it is necessary to carry out a fine processing step in which it must be formed in an irregular shape. In addition, since the lead pieces of each contact terminal are very small, there is a problem that the processing is not easy and the processing workability is poor.

[0007] Then, as shown in FIG.
One pair of lead frames 2a and 2b is bent substantially in an L-shape, and the L-shaped horizontal portion is made to penetrate into a pair of mounting holes 3a and 3b of the lighting circuit board 3;
When they are fixed and electrically and mechanically connected to each other, the central axis Oa of the LED 1 in the axial direction is
Is eccentric in the thickness direction of the lighting circuit board 3.

For this purpose, the lower end 1a of the LED 1 in the drawing is shown.
Then, the shape of the insertion hole of the socket body (not shown) into which the entire lighting circuit board 3 is inserted becomes asymmetric. For this reason, the molding of the socket body is not easy, the mold of the socket body becomes complicated, and there is a problem that the cost is increased.

Therefore, the present invention has been made in view of such circumstances, and its purpose is to simplify the moldability of the socket body and reduce the cost, or to prevent incorrect assembly of the polarity. It is an object of the present invention to provide a light source device and a display device.

[0010]

According to the first aspect of the present invention, there is provided a light source having a polarity; a circuit board disposed substantially on the same axis as the light source and electrically connected thereto; A socket body; an internal terminal portion housed in the socket body and electrically connected to a contact of a circuit board, and electrically connected to the internal terminal portion to protrude outside the socket body. And a contact terminal having an external terminal portion fixed in a state.

According to the present invention, since the light source and the circuit board are disposed substantially coaxially, the insertion hole of the socket body for accommodating the light source and the circuit board can be formed concentrically. For this reason, since the socket main body can be formed symmetrically, this socket main body can be easily formed and the dimensions can be easily taken. Therefore, the dimensional accuracy can be improved, and the mold for the socket body can be easily formed, so that the cost can be reduced.

According to a second aspect of the present invention, the lead frames of the light source are arranged in a pair in the axial direction, and a curved portion which is curved in a direction orthogonal to the arrangement direction is formed in an intermediate portion of the frame. It is characterized by being.

According to the present invention, in addition to the functions and effects of the first aspect, the lead frame of the light source is bent in the direction perpendicular to the axis, and the bent front end is electrically and mechanically connected to the circuit board. This simplifies the coaxial arrangement of the light source on the circuit board.

A third aspect of the present invention is characterized in that the socket body is provided with a pair of locking portions formed on the outer surface of the socket body in a mutually different shape.

According to the present invention, in addition to the functions and effects of the first and second aspects of the present invention, the pair of locking portions formed on the outer surface of the socket body are mutually deformed, so that By associating the difference in shape with the polarity of the light source in advance, the polarity of the light source can be easily and reliably recognized by visually observing the difference in shape of the locking portions.

Therefore, when this light source device is mounted on a printed circuit board or the like of a display device such as a vehicle-mounted meter, it is possible to prevent erroneous assembly in which the polarity is erroneously mounted.

According to a fourth aspect of the present invention, there is provided a light source device according to any one of the first to third aspects, and an insertion hole through which the light source device is inserted; A printed circuit board including a mating engagement hole and an electrode formed on the entire periphery of the insertion hole and electrically connected to an external terminal of the light source device; a display unit illuminated by the light source device; A light source device, a printed circuit board, and a housing for accommodating the display unit.

According to the present invention, since the light source device according to any one of claims 1 to 3 is provided, substantially the same operation and effect as the light source device can be obtained.

[0019]

BRIEF DESCRIPTION OF THE DRAWINGS FIG.
This will be described with reference to FIG. In these figures, the same or corresponding parts are denoted by the same reference characters.

FIG. 2 is a plan view of the light source device 11 according to the first embodiment of the present invention in which the LED (light emitting diode) main body is omitted, FIG. 3 is a sectional view taken along the line III-III of FIG. 2, and FIG. 2, FIG. 5 is a bottom view of FIG. 2, and FIG. 6 is a view of VI of FIG.
It is an arrow view. As shown in these figures, the light source device 11
In the insertion hole 13 of the socket body 12 formed of, for example, 66 nylon resin having electrical insulation, at least a base end portion 14a of an LED (light emitting diode) 14 and a flat plate for lighting the LED 14 And the circuit board 15 are inserted and fixed. A lighting circuit for the LEDs 14 is provided on the circuit board 15, and circuit components such as resistors and capacitors are mounted on both surfaces or one surface thereof.

The socket body 12 is inserted into a circular insertion hole of a printed circuit board such as a vehicle-mounted meter, which will be described later, and has an insertion cylindrical portion 16 protruding to one side thereof.
A gripping knob 18 integrally formed with an outwardly projecting flange 17 having a larger diameter than the gripping knob 18 is coaxially and integrally connected in the axial direction.

On the outward flange 17, external terminals 19a and 20a of a pair of conductive and elastic thin flat contact terminals 19 and 20 are disposed so as to face each other in the diameter direction of the socket body 12. I have.

As shown in FIG. 3, the socket main body 12 has two diametrically opposed inner side surfaces of the insertion hole 13.
A pair of guide grooves 21a and 21b, which are concave grooves for fitting a pair of thin flat plate contact terminals 19 and 20 from the bottom surface of the socket body 12 to the inside thereof, are arranged in parallel in the axial direction.

FIG. 7 is a front view of the contact terminals 19 and 20. Internal terminal portions which stand on the upper portions of the main bodies 19b and 20b at right angles from the left and right side edges in the figure to the front side of the paper of FIG. A pair of elastic tongue pieces 19c, 19d, 20c, 2
0d is integrally formed. These elastic tongues 19c, 1
7 are cut off from both side edges of the contact terminal main bodies 19b, 20b, bent toward the central axis Oc side of the main bodies 19b, 20b, and are mutually displaced on the central axis Oc. The elastic tongues 19c and 19d, 20c and 20d of each pair as shown by the broken lines in FIG.
Thus, the both sides in the width direction of the circuit board 15 are elastically sandwiched in the thickness direction.

The external terminals 19a, 20a bent outward are provided at the lower ends of the contact terminal bodies 19b, 20b.
Are formed integrally, and these external terminals 19b and 20b are arranged so as to protrude outward on the flange 17 of the socket body 12 as described above. As shown in FIG. 8, a bead 1 is provided on the rear surface of the intermediate portion in the width direction of each of the external terminals 19a and 20a.
9e and 20e are respectively formed over the entire length of the groove, and the mechanical strength of each of the external terminals 19a and 20a is enhanced.

As shown in FIG. 7, each contact terminal 19,
The cutout 20 has upper and lower tongue pieces 19f, 20f formed on the upper portions of the main bodies 19b, 20b, and integrally formed engaging protrusions 19g, 20g which protrude outwardly in the lower part of FIG. Then, the lower ends in FIG. 7 of the cut and raised tongue pieces 19f, 20f are projected outward.

Each of the contact terminals 19, 2 thus constructed
0 is a pair of bottom openings 2 of the socket body 12 shown in FIG.
2a and 22b are inserted into a pair of guide grooves 21a and 21b, respectively, and are inserted inward in the axial direction, respectively. As shown in FIG.
When the vehicle slides over an annular projection 13a slightly protruding inward at an axially intermediate portion of the insertion hole 13 in the socket body 12 from the lower side to the upper side in FIG. 3 and the upper ends of the locking projections 19g and 20g abut against the lower surface of the annular projection 13a in FIG. For this purpose, each of these locking projections 19g,
Since the annular projection 13a is sandwiched between the tongue pieces 19f and 20f, the contact terminals 19 and 20 are fixed in the socket body 12.

Then, as shown in FIG.
It is fixed to the circuit board 15 on the axial center axis Od. That is, the LED 14 is attached to the pair of lead frames 23 and 24 arranged in parallel in the axial direction by the axial center axis Od.
For example, semicircular curved portions 23a and 24a are formed so as to protrude outward in the orthogonal direction, and the distal ends of these curved portions 23a and 24a are connected to a pair of circuit boards 15 as shown in FIG. The LED 14 is coaxially disposed on the circuit board 15 and is electrically connected to the mounting hole 15a, 15b.

Further, the circuit board 15 is formed at a middle portion in the axial direction on one surface side, and a pair of contacts 15c and 15d are formed on both left and right sides of the circuit board 15 so as to be substantially flush with each other.
c and 15d are electrically connected to a pair of mounting holes 15a and 15b via a lighting circuit of the circuit board 15.

The circuit board 15 on which the LEDs 14 are coaxially mounted as described above has a pair of contact terminals 19 and 20 mounted in the insertion holes 13 of the socket body 12 and then inserted into the insertion holes 13 in FIG. Insert from. Then, both side edges in the width direction of the circuit board 15 are inserted into the gaps between the elastic tongue pieces 19c and 19d, 20c and 20d of each pair of the contact terminals 19 and 20, and are guided and inserted, respectively. When the elastic tongues 19 and 20 are inserted strongly against the elastic force of the lower closed legs, the both side edges of the circuit board 15 in the width direction as shown by broken lines in FIG. By elastic tongue pieces 19c and 19d, 20c and 20d,
At the same time as being elastically held in the thickness direction, one of the elastic tongues, for example, the inner surfaces of the distal ends of 19g and 20g are elastically pressed against a pair of contacts 15c and 15d on one surface of the circuit board 15. , Electrically connected.

As shown in FIG. 2, FIG. 4, and FIG. 6, a pair of locking portions 26, 27 on the outward flange 17 are formed on the outer surface of the insertion cylindrical portion 16 of the socket body 2 in the diameter direction. They protrude integrally at almost opposing positions. As shown in FIGS. 4 and 6, each of the locking portions 26 and 27 has one side surface as shown in FIG.
Insertion hole 29 of printed circuit board 28 such as a vehicle-mounted meter
The socket body 12 is rotated around the axis while the insertion cylindrical portion 16 is inserted into the insertion hole 29 of the printed circuit board 28 by forming the openings 26a and 27a into which the peripheral edges of the opening are fitted, respectively. The periphery of the opening of the hole 29 is fitted into the opening 26a, 27a of each of the locking portions 26, 27 so that the light source device 11 is detachably mounted on the printed circuit board 28.

One of the locking portions 27 is connected to the other
Are formed larger and irregularly.
By associating the polarities of the locking portions 26 and 27 in advance with the polarities of the LEDs 14, it is possible to visually and easily recognize the difference in shape of the locking portions 26 and 27 and the polarities of the external terminals 19a and 20a in the vicinity thereof. Is available.

As shown in FIG. 4, the large locking portion 27
A pair of left and right insertion guides 27b and 27c are formed to protrude integrally with each other and extend substantially parallel to the axial direction by bifurcating the upper end portion in the figure, and to form tapered portions 27d and 27e at the insertion end portions, respectively. When inserting into the insertion hole 29 of the printed circuit board 28 shown in FIG. 9, the insertion direction is guided. Furthermore, these insertion guides 2
7b and 27c are inserted into the insertion holes 1 inside thereof.
3 is prevented from causing sink marks and reducing the roundness of the insertion hole 13.

On the other hand, as shown in FIG.
Is formed with an insertion hole 29 through which the insertion cylindrical portion 16 of the socket body 12 is inserted, and a pair of arc-shaped electrode portions 30a,
30b are formed so as to oppose each other in the diametrical direction, and insertion holes 31a, 31 through which a pair of locking portions 26, 27 of the socket body 2 are inserted between the electrode portions 30a, 30b.
b are integrally coupled with each other.

Therefore, when inserting the light source device 11 into the insertion hole 29 of the printed circuit board 28, first, the light source device 1
The shape of the pair of locking portions 26 and 27 is visually observed, and the locking portions 26 and 27 and the pair of external terminals 19 near the locking portions 26 and 27 are located.
The polarities of a and 20a are confirmed, and the polarities of the pair of electrode portions 30a and 30b on the printed circuit board 28 are confirmed.

Next, the insertion cylindrical portion 16 of the light source device 11
Is inserted into the insertion hole 29 of the printed circuit board 28, the insertion is guided in the axial direction by the insertion guides 27b and 27c of the socket body 12, and the flange 1 of the socket body 12 is
7, when the socket body 12 is rotated around the axis, the openings 26a, 27a of the locking portions 26, 27 of the socket body 12 fit into the pair of electrode portions 30a, 30b of the printed circuit board 28. They are clamped together in the front and back direction and fixed. Thereby, the pair of external terminals 19 of the light source device 11 are formed.
a, 20a are a pair of electrodes 30a, 3 of the printed circuit board 28;
0b, which are in close contact with each other and electrically connected.

Further, in the state where the light source device 11 is attached to the insertion hole 29 of the printed circuit board 28, the polarities of the pair of external terminals 19a, 20a and the pair of electrodes 30a, 30b are opposite to each other as described above. , One of the pair of electrodes 30a, 30b, for example, 3
If 0a is the anode side, a current on the anode side is first supplied to one of the external terminals 19a that is in contact with the electrode 30a on the anode side, and thereafter, one of the lighting circuit (not shown) in the circuit board 15 and one of the LEDs 14 Lead frame 23, LED1
4, the other lead frame 24, the other external terminal 20a
After that, the current flows again to the electrode 30b on the other cathode side of the printed circuit board 28, and the LED 14 is turned on.

Therefore, according to this embodiment, LE
Since the D14 and the circuit board 15 are arranged coaxially, the insertion hole 13 of the socket body 12 that accommodates them can be formed concentrically. For this purpose, the socket body 12
Can be formed symmetrically, so that the socket body 12 can be easily formed and the dimensions can be easily taken. Therefore, the dimensional accuracy can be improved, and the mold of the socket body 12 can be easily formed, so that the cost can be reduced.

Further, the pair of lead frames 23 and 24 of the LED 14 are bent, and the bent ends are inserted into the mounting holes 15a and 15b of the circuit board 15 and fixed, thereby electrically and mechanically connecting. Therefore, the LED 14 can be easily disposed coaxially on the circuit board 15.

Further, since the size and shape of the pair of locking portions 26 and 27 formed on the outer peripheral portion of the socket body 12 are different, these locking portions 26 and 27 are made to correspond to the polarity of the LED 14 in advance. Thereby, the polarity of the light source can be easily and reliably recognized by visually observing the difference in shape between the locking portions 26 and 27.

Therefore, when this light source device 11 is attached to the insertion hole 29 or the like of the printed circuit board 28 of a display device such as a vehicle-mounted meter, it is possible to prevent erroneous assembly in which the polarity is erroneously attached.

Since the pair of contact terminals 19 and 20 are symmetrical, mass production is easier than in the case where these shapes are asymmetrical.

Also, the elastic tongues 19c and 19d, 20c and 20d, which are the internal terminals of the contact terminals 19 and 20, are electrically connected to the contacts 15c and 15d of the circuit board 15 by elastically pressing them. So these elastic tongues 1
9c, 19d, 20c and 20d are connected to the contact 1 of the circuit board 15.
Compared with the case where the circuit board 15 is fixed by soldering to the circuit boards 5c and 15d, the circuit board 15 can be reliably electrically connected without having a thermal effect at the time of soldering. The operation can be simplified.

Then, the light source device 1 thus configured
When the display device 1 is configured by inserting it into the insertion hole 29 of a printed circuit board 28 such as a vehicle-mounted meter or the like to form a display device, first, the difference in shape between the pair of locking portions 26 and 27 of the light source device 11 is visually checked.
The polarities of the locking portions 26 and 27 and the pair of external terminals 19a and 20a near the locking portions 26 and 27 are checked, and the polarities of the pair of electrode portions 30a and 30b of the printed circuit board 28 are checked. Next, when the insertion cylindrical portion 16 of the light source device 11 is inserted into the insertion hole 29 of the printed circuit board 28, the insertion is guided in the axial direction by the insertion guides 27b and 27c of the socket main body 12, and the flange of the socket main body 12 is formed. When the socket body 12 is rotated around the axis when the socket body 17 is inserted, the openings 26 a and 27 a of the locking portions 26 and 27 of the socket body 12
a, 30b, and are clamped in the front and back directions and fixed.
As a result, the pair of external terminals 19a, 2
Oa is in close contact with each of the pair of electrodes 30a and 30b of the printed circuit board 28 to be electrically connected.

Therefore, according to this display device, the light source device 11 can be smoothly inserted into the insertion hole 29 of the printed circuit board 28 by the insertion guides 27c and 27d, and the pair of locking portions 26 and 27 can be used. Since the polarity of the LED 14 can be recognized by visually observing the difference in the shape, the erroneous assembly on the printed circuit board 28 can be prevented.

Further, the socket body 12 of the light source device 11
Since the cost of the mold can be reduced, the cost as a display device can also be reduced.

[0047]

As described above, the first aspect of the present invention is:
Since the light source and the circuit board are arranged coaxially, the insertion hole of the socket body for accommodating them can be formed concentrically. For this reason, since the insertion hole of the socket main body can be formed symmetrically, the socket main body can be easily formed and the dimensions can be easily taken. For this reason, the dimensional accuracy can be improved, and the mold for the socket body can be easily formed.
Cost can be reduced.

According to the second aspect of the present invention, in addition to the functions and effects of the first aspect, the lead frame of the light source is bent in a direction perpendicular to the axis, and the bent front end is electrically and mechanically connected to the circuit board. Simplifies the coaxial arrangement of the light source on the circuit board.

According to the third aspect of the present invention, in addition to the functions and effects of the first or second aspect of the present invention, the pair of locking portions formed on the outer surface of the socket body are deformed from each other. By associating the difference in shape of the stop with the polarity of the light source in advance, the polarity of the light source can be easily and reliably recognized by visually observing the difference in shape of the locking portion.

Therefore, when this light source device is mounted on a printed circuit board or the like of a display device such as an on-vehicle meter, it is possible to prevent erroneous mounting in which the polarity is incorrectly mounted.

According to the fourth aspect of the present invention, since the light source device according to any one of the first to third aspects is provided, substantially the same operation and effect as the light source device can be obtained.

[Brief description of the drawings]

FIG. 1 is an enlarged view of a main part showing an arrangement state of an LED and a circuit board shown in FIG. 3 and the like.

FIG. 2 is a partially omitted plan view of the light source device according to the first embodiment of the present invention.

FIG. 3 is a sectional view taken along line III-III in FIG. 2;

FIG. 4 is a view taken in the direction of arrow IV in FIG. 2;

FIG. 5 is a bottom view of FIG. 2;

FIG. 6 is a view taken in the direction of arrow VI in FIG. 2;

FIG. 7 is a rear view of the contact terminal shown in FIG. 3 and the like;

FIG. 8 is a side view of a portion VIII in FIG. 7;

FIG. 9 is a plan view around the insertion hole of the printed circuit board.

FIG. 10 is a diagram showing an arrangement state of LEDs and a circuit board of a conventional light source device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 11 Light source device 12 Socket main body 13 Insertion hole 14 Light emitting diode (light source) 15 Circuit board 15a, 15b Mounting hole 15c, 15d Contact 19, 20 A pair of contact terminal 19a, 20a External terminal 19c, 19d, 20c, 20d Elastic tongue piece 23 , 24 A pair of lead frames 23a, 24a A pair of curved portions of the lead frame 28 Printed circuit board 29 Insertion holes of the printed circuit board 30a, 30b A pair of electrodes 31a, 31b of the printed circuit board A pair of engagement holes of the printed circuit board

Claims (4)

[Claims] A light source having a polarity; a circuit board disposed substantially on the same axis as the light source and electrically connected to the light source; a socket body accommodating the circuit board; A contact having an internal terminal portion electrically connected to the contact of the circuit board and an external terminal portion electrically connected to the internal terminal portion and fixed in a state of protruding outside the socket body. A light source device comprising: a terminal; 2. A lead frame of a light source is arranged in a pair in the axial direction, and a curved portion which is curved in a direction perpendicular to the juxtaposition direction is formed in an intermediate portion of the frame. The light source device according to claim 1. 3. The light source device according to claim 1, further comprising a pair of locking portions formed on the outer surface of the socket body in a mutually different shape. 4. A light source device according to claim 1, further comprising: an insertion hole through which the socket body is inserted; and an engagement hole which is connected to the insertion hole and engages with the engaging portion so as to be detachably engageable. And a printed circuit board including an electrode formed on the entire periphery of the insertion hole and electrically connected to an external terminal of the light source device; a display unit illuminated by the light source device; And a housing for housing the display unit;
A display device comprising: