JP7307381B2 - Light source device - Google Patents

Description

The present invention relates to a light source device having light emitting elements.

2. Description of the Related Art There is a light source device that individually controls a plurality of light emitting elements that emit light in different wavelength ranges in order to emit light of a desired color. In that case, it is necessary to provide separate wiring for at least one of the positive and negative electrodes of the light emitting element, and further to provide a protective element corresponding to each light emitting element.

As an example of such a light source device, a plurality of light emitting elements are mounted on a common wiring, and protective elements corresponding to the respective light emitting elements are mounted on individual wirings corresponding to the respective light emitting elements. In some cases, the electrode and the top electrode of the protective element have the same polarity. In this case, in order to avoid interference between the wires extending from the upper surface electrodes of the light emitting element and the wires extending from the upper surface electrodes of the protection element, it is necessary to dispose the individual members apart from each other. Requires area.

In order to deal with this problem, a light source device has been proposed in which the polarity of the protective element is reversed from that of the light emitting element (see, for example, Patent Document 1).

JP-A-2002-314146

In the light source device described in Patent Document 1, the polarity of the top electrode of the protection element is reversed to that of the top electrode of the light emitting element, so that the protection element is mounted on the same wiring as the light emitting element. As a result, more rational arrangement and wiring can be realized in terms of interference between wires extending from the light emitting element and wires extending from the protection element. However, when the number of light-emitting elements mounted on the light source device increases, the area of the wiring on which the light-emitting elements and protective elements are mounted increases, and an insulating space is required between the individual wirings. It requires a large area. Therefore, there is a natural limit to reducing the size of the light source device.

The present disclosure has been made in view of the above problem, and an object thereof is to provide a compact light source device capable of individually controlling a plurality of light emitting elements.

In order to solve the above problems, in a light source device according to an aspect of the present invention,
one or more first wires;
a plurality of second wirings;
a plurality of light emitting elements having bottom electrodes connected to the first wiring;
a plurality of protective elements each connected to each of the light emitting elements, the bottom electrodes of which are connected to the second wiring corresponding to each of the light emitting elements;
a plurality of first wires connecting between the top electrode of each light emitting element and the corresponding second wiring;
a second wire that connects between the top electrodes of the plurality of protection elements;
a third wire connecting between the upper surface electrode of at least one of the protective elements and the first wiring;
with
upper electrodes of the plurality of light emitting elements and the plurality of protection elements have the same polarity;
The first wire is arranged below the second wire.

As described above, the present disclosure can provide a compact light source device capable of individually controlling a plurality of light emitting elements.

BRIEF DESCRIPTION OF THE DRAWINGS It is a perspective view which shows typically the light source device which concerns on the 1st Embodiment of this invention. BRIEF DESCRIPTION OF THE DRAWINGS It is a top view which shows typically the light source device which concerns on the 1st Embodiment of this invention. FIG. 3 is a sectional view showing the III-III section of FIG. 2; 1 is a circuit diagram showing the circuit configuration of a light source device according to a first embodiment of the invention; FIG. It is a perspective view which shows typically the light source device which concerns on the 2nd Embodiment of this invention. It is a perspective view which shows typically the light source device which concerns on the 3rd Embodiment of this invention. It is a top view which shows typically the light source device which concerns on the 3rd Embodiment of this invention. FIG. 8 is a cross-sectional view showing the VIII-VIII cross section of FIG. 7; It is a circuit diagram which shows the circuit structure of the light source device which concerns on the 3rd Embodiment of this invention.

Hereinafter, embodiments and examples for carrying out the present invention will be described with reference to the drawings. Note that the light source device described below is for embodying the technical idea of the present invention, and the present invention is not limited to the following unless there is a specific description.
In each drawing, members having the same function may be given the same reference numerals. In consideration of the explanation of the main points or the ease of understanding, the embodiments and examples may be divided for convenience, but the configurations shown in different embodiments and examples can be partially replaced or combined. In the embodiments and examples described later, descriptions of matters common to those described above will be omitted, and only differences will be described. In particular, similar actions and effects due to similar configurations will not be referred to successively for each embodiment or example. The sizes and positional relationships of members shown in each drawing may be exaggerated for clarity of explanation.

(Light source device according to the first embodiment)
First, a light source device according to a first embodiment of the present invention will be described with reference to FIGS. 1 to 4. FIG. FIG. 1 is a perspective view schematically showing a light source device according to a first embodiment of the invention. FIG. 2 is a plan view schematically showing the light source device according to the first embodiment of the invention. FIG. 3 is a sectional view showing the III-III section of FIG. FIG. 4 is a circuit diagram showing the circuit configuration of the light source device according to the first embodiment of the invention. In the circuit diagram of FIG. 4, arrows indicate that the current flows from the upper side to the lower side of the drawing.

The light source device 2 according to this embodiment includes a package 40 in which side walls 44 are formed around a substrate 42 . In this embodiment, the substrate 42 has a substantially flat plate shape. Substrate 42 and sidewalls 44 may be integrally formed, or separate substrates 42 and sidewalls 44 may be joined together.
A plurality of (here, six) light-emitting elements 10A to 10F are arranged on the substrate 42 . Also disposed on the substrate 42 is a rising mirror 50 having a reflecting surface 50A for reflecting the light emitted from the light emitting elements 10A to 10F. Light emitted from the light emitting elements 10A to 10F is reflected by the reflective surface 50A in a substantially vertical upward direction with respect to the substrate .

As materials for the substrate 42, the sidewalls 44, and the rising mirror 50, any known materials such as glass, monocrystalline or polycrystalline materials such as silicon, ceramic materials, and resin materials can be applied. Further, instead of using the individual rising mirrors 50, the sidewalls 44 can be used as reflecting surfaces to reflect the light emitted from the light emitting elements 10A to 10F substantially vertically upward.

The light source device 2 according to this embodiment includes, on a substrate 42, one or a plurality of (here, one) first wirings 4 and a plurality of (here, six) second wirings 6A to 6F. A plurality of (here, six) light-emitting elements 10A to 10F are mounted on the first wiring 4. As shown in FIG. At this time, the light emitting elements 10A to 10F have the P electrode (positive electrode) as the top electrode, the N electrode (negative electrode) as the bottom electrode, and the bottom electrode is connected to the first wiring 4 .

Protective elements 20A to 20F corresponding to the respective light emitting elements 10A to 10F are mounted on the second wirings 6A to 6F corresponding to the respective light emitting elements 10A to 10F. At this time, the light emitting elements 10A to 10F also have the P electrode (positive electrode) as the top electrode, the N electrode (negative electrode) as the bottom electrode, and the bottom electrode is connected to the second wirings 6A to 6F.

As described above, the top electrodes of the plurality of light emitting elements 10A to 10F and the plurality of protection elements 20A to 20F have the same polarity. In this embodiment, the case where the upper surface electrode is a P electrode (positive electrode) is shown, but the present invention is not limited to this, and the upper surface electrodes of the plurality of light emitting elements 10A to 10F and the plurality of protection elements 20A to 20F are N electrodes (positive electrodes). negative electrode).

In this embodiment, laser diodes are used as the light emitting elements 10A to 10F. As the laser diode, it is possible to use a nitride semiconductor laser element that emits light in the wavelength range from ultraviolet to green, or a GaAs semiconductor laser element that emits light in the wavelength range from red to infrared. can. As a result, the light source device 2 with high brightness and excellent color reproducibility can be realized.
However, the light-emitting element is not limited to a laser diode, and any other light-emitting element such as an LED can be used.

The protection elements 20A to 20F are elements for protecting the light emitting elements 10A to 10F from surge current and static electricity, and Zener diodes are used in this embodiment. However, it is not limited to this, and any known protection element such as a varistor element, an ESD suppressor, an arrestor element can be used.

A plurality of first wires 30A to 30F are connected between the upper electrodes of the respective light emitting elements 10A to 10F and the corresponding second wirings 6A to 6F. As will be described later, this allows the light emitting elements 10A to 10F to individually emit light by supplying power to the second wirings 6A to 6F.

Further, upper electrodes of the plurality of protective elements 20A to 20F are connected by second wires 32CA, 32AB, 32DF and 32FE, respectively. Third wires 34B and 34E are connected between the upper surface electrodes of at least one protection element (here, 20B and 20E) and the first wiring 4 . As will be described later, this can prevent surge current, static electricity, and reverse current from flowing through the second wirings 6A to 6F to the light emitting elements 10A to 10F.

As is clear from FIGS. 1 and 2, in this embodiment, three light emitting elements 10A to 10C and corresponding protection elements 20A to 20C, and three light emitting elements 10D to 10F and corresponding protection elements 20D to 20F are approximately They are arranged symmetrically and connected.

<Light emitting elements 10A to 10C>
Among the members and their wiring arranged substantially symmetrically, the three light emitting elements 10A to 10C and the corresponding protection elements 20A to 20C arranged on the lower side in FIG. 2 will be described below as an example.
First, the light emitting element 10A will be described. A first wire 30A connects the second wiring 6A and the upper surface electrode of the light emitting element 10A. Also, the bottom electrode of the light emitting element 10A is connected to the first wiring 4 . Accordingly, by supplying power to the second wiring 6, a current flows through the upper surface electrode (P electrode) of the light emitting element 10A through the first wire 30A, and the current flows from the upper surface electrode (P electrode) to the P-type cladding layer, the active layer, and the active layer. layer and the N-type cladding layer, and then from the bottom electrode (N-electrode) of the light-emitting element 10A to the first wiring 4 . This allows the light emitting elements 10A to emit light individually.

The same applies to the light emitting element 10B, and the second wiring 6B and the upper surface electrode of the light emitting element 10B are connected by the first wire 30B. Also, the bottom electrode of the light emitting element 10B is connected to the first wiring 4 . Accordingly, by supplying power to the second wiring 6B, a current flows through the upper surface electrode (P electrode) of the light emitting element 10B through the first wire 30B, and the current flows from the upper surface electrode (P electrode) to the P-type cladding layer, the active layer, and the active layer. layer and the N-type cladding layer, and then from the bottom electrode (N-electrode) of the light-emitting element 10B to the first wiring 4 . This allows the light emitting elements 10B to emit light individually.

The same applies to the light emitting element 10C, and the second wiring 6C and the upper surface electrode of the light emitting element 10C are connected by the first wire 30C. Also, the bottom electrode of the light emitting element 10C is connected to the first wiring 4 . As a result, by supplying power to the second wiring 6C, a current flows through the upper surface electrode (P electrode) of the light emitting element 10C through the first wire 30C. layer and the N-type cladding layer, and then from the bottom electrode (N-electrode) of the light-emitting element 10C to the first wiring 4 . This allows the light emitting elements 10C to emit light individually.

Next, the protection elements 20A to 20C will be described. The protection element 20A corresponding to the light emitting element 10A is mounted so that the bottom electrode (N electrode) is in contact with the second wiring 6A corresponding to the light emitting element 10A. The protection element 20B corresponding to the light emitting element 10B is mounted so that the bottom electrode (N electrode) is in contact with the second wiring 6B corresponding to the light emitting element 10B. The protective element 20C corresponding to the light emitting element 10C is mounted so that the bottom electrode (N electrode) is in contact with the second wiring 6C corresponding to the light emitting element 10C.

As is clear from FIGS. 1 and 2, in this embodiment, from the left side of the drawing (from the rising mirror 50 side), the second wiring 6C corresponding to the light emitting element 10C, the second wiring 6A corresponding to the light emitting element 10A, the light emitting element They are arranged in order of the second wiring 6B corresponding to the element 10B.
A second wire 32CA connects the upper surface electrode (P electrode) of the leftmost protection element 20C and the upper surface electrode (P electrode) of the center protection element 20A. Furthermore, a second wire 32AB connects the upper surface electrode (P electrode) of the central protective element 20C and the upper surface electrode (P electrode) of the right protective element 20B. A third wire 34B connects the top electrode (P electrode) of the protection element 20B on the right side and the first wiring 4 .

As a result, if overvoltage, reverse current, or the like due to static electricity occurs on the second wiring 6C side, the current flows from the second wiring 6C to the bottom electrode (N electrode) of the protection element 20C and the inside of the protection element 20C. to the upper electrode (P electrode). Current flows from the top electrode (P electrode) of the protection element 20C to the top electrode (P electrode) of the protection element 20A via the second wire 32CA, and flows from the top electrode (P electrode) of the protection element 20A to the top electrode (P electrode) of the protection element 20A. It flows to the upper electrode (P electrode) of the protective element 20B via the two wires 32AB. Further, current flows from the upper electrode (P electrode) of the protective element 20B to the first wiring 4 via the third wire 34B.

In addition, since the current flows in the direction of less electrical resistance, the current flowing from the second wire 32CA to the protection element 20A does not flow in the protection element 20A but flows to the second wire 32AB. Furthermore, the current flowing from the second wire 32AB to the protective element 20B does not flow through the protective element 20B, but flows toward the third wire 34B. Thereby, the light emitting element 10C can be reliably protected from the reverse current.

If a surge current or static electricity occurs on the second wiring 6A side, the current flows from the second wiring 6A through the bottom electrode (N electrode) of the protection element 20A, the inside of the protection element 20A, and the top electrode ( P electrode). Current flows from the upper electrode (P electrode) of the protection element 20A to the upper electrode (P electrode) of the protection element 20B via the second wires 32AB and 32CA, and further flows from the upper electrode (P electrode) of the protection element 20B. ) to the first wiring 4 via the third wire 34B.
In addition, since the current flows in the direction of less electrical resistance, the current flowing from the second wire 32AB to the protective element 20B does not flow in the protective element 20B, but flows toward the third wire 34B. Thereby, the light emitting element 10A can be reliably protected from the reverse current.

If a surge current or static electricity occurs on the side of the second wiring 6B, the current flows from the second wiring 6B through the bottom electrode (N electrode) of the protection element 20B, the inside of the protection element 20B, and the top electrode ( P electrode). Further, current flows from the upper electrode (P electrode) of the protective element 20B to the first wiring 4 via the third wire 34B. Thereby, the light emitting element 10B can be reliably protected from the reverse current.

<Wiring of Light Emitting Element and Protection Element>
Next, a plurality of light emitting elements are mounted on one or more wirings, protective elements corresponding to the light emitting elements are mounted on individual wirings corresponding to the respective light emitting elements, and the upper surface electrodes and protective elements of the light emitting elements are mounted. Consider the wiring in a light source device in which the top electrodes of the elements have the same polarity. In such a light source device, generally, interference between wires connecting the upper surface electrodes of each light emitting element and individual wirings and wires connecting between the upper surface electrodes of each protective element and one or more wirings is suppressed. To avoid this, the individual members must be spaced apart. As a result, the substrate as a whole requires a large area.

In contrast, in this embodiment, the upper electrodes of the plurality of protection elements 20A to 20C are connected by the second wires 32CA and 32AB, and the upper electrodes of the light emitting elements 10A to 10C and the second wirings 6A to 6C are connected. are arranged below the second wires 32CA and 32AB.

Specifically, a first wire 30C connecting between the upper surface electrode of the light emitting element 10C and the second wiring 6C is arranged to three-dimensionally extend under the second wire 32CA connecting between the upper surface electrode of the protection element 20C and the protection element 20A. extends to intersect the Further, a first wire 30A connecting between the upper surface electrode of the light emitting element 10A and the second wiring 6A, and a first wire 30B connecting between the upper surface electrode of the light emitting element 10B and the second wiring 6B are connected to the upper surface electrode of the protection element 20A. and the second wire 32AB connecting between the upper surface electrodes of the protection element 20B.

Furthermore, among the protective elements 20A to 20C connected to each other by the upper surface electrodes, the upper surface electrode of the protective element 20B at a position where the possibility of interference with other members is low and the first wiring 4 are connected by the third wire 34B. is As a result, even if a surge current or static electricity occurs in any of the second wirings 6A to 6C, the second wires 32CA and 32AB connecting the upper surface electrodes of the protective elements 20A to 20C, the upper surface electrodes of the protective element By the third wire 34B connecting between the one wirings, the reverse current can be bypassed and escaped to the first wiring 4 without flowing to the light emitting elements 10A to 10C.

As described above, in the present embodiment, in the light source device 2 capable of individually controlling the plurality of light emitting elements 10A to 10C, the wires are arranged three-dimensionally using the height dimensions of the protective elements 20A to 20C, thereby Even if the light emitting elements 10A to 10C mounted on the first wiring 4 and the protective elements 20A to 20C mounted on the second wirings 6A to 6C are arranged close to each other, interference between the wires can be effectively prevented.

In particular, even when the first wiring 4 and the second wirings 6A to 6C are arranged on substantially the same plane, the three-dimensional arrangement of the wires using the height dimensions of the protective elements 20A to 20C Wire interference can be reliably prevented.

If the protection elements 20A to 20C are not arranged on the sides of the light emitting elements 10A to 10C, it will be difficult to connect the upper electrodes of the protection elements 20A to 20C and the first wiring 4 with wires. In particular, when the rising mirror 50 is arranged on the output side of the light emitting elements 10A to 10F as in the present embodiment, it may be necessary to arrange a protective element on the side of the rising mirror 50 like the protective element 20C. occur. That is, the rising mirror 50 is arranged on the output side of the light emitting elements 10A to 10F, and at least a part of the protective elements 20A to 20C (protective element 20C) is arranged on the side of the rising mirror 50. FIG. In this case, it is difficult to directly connect the upper surface electrode of the protection element 20</b>C arranged on the side of the rising mirror 50 and the first wiring 4 with a wire.
However, the upper electrodes of the protection elements 20A to 20C are connected by the second wires 32CA and 32AB, and the upper electrodes of the protection element 20B, which are located at a position where there is a low possibility of interfering with the rising mirror 50 and the light emitting elements 10A to 10C, are connected. , By connecting the third wire 34 to the first wiring 4, even if a reverse current occurs in the second wiring 6C, the reverse current does not flow to the light emitting element 10C, but flows through the protection element 20C to the first wiring. You can escape to 4.

In this embodiment, the second wiring 6C corresponding to the light emitting element 10C arranged on the middle side in the width direction of the substrate 42 is arranged on the leftmost side (on the side of the rising mirror 50) in the drawing. It is not limited. The second wiring 6A (or B) corresponding to the light emitting element 10A (or B), which is arranged on the outside due to the position of the upper surface electrode of the light emitting element, the arrangement of other members, etc. It may be arranged on the lift mirror 50 side). Accordingly, the combinations of the first wires and the second wires that are three-dimensionally arranged may also have various aspects.

In addition, in the present embodiment, the third wire 34B connects the top electrode of the protective element 20B located on the rightmost side in FIG. 2 and the first wiring 4, but the present invention is not limited to this. Depending on the arrangement of the members, the third wire 34 can connect between the upper surface electrode of the protection element 20 and the first wiring 4 at any position. Further, if wires can be arranged, the upper electrodes of the plurality of protection elements 20 and the first wirings 4 can be connected by a plurality of third wires 34 .
Further, in the present embodiment, a plurality of light emitting elements 10A to 10F are mounted on one first wiring 4, but the plurality of first wirings 4 . . . It may be mounted on the wiring 4 . . . Even in that case, if the upper surface electrode of at least one protection element 20 and any one of the first wirings 4 are connected by the third wire 34, the current flowing through the arbitrary protection element 20 is Through the second wire 32 and the third wire 34 connecting between the upper surface electrodes of the protective element 20 , it can escape to the first wiring 4 connected to the third wire 34 .

<Light emitting elements 10D to 10F>
Next, the light emitting elements 10D to 10F and the corresponding protection elements 20D to 20F arranged substantially symmetrically with respect to the light emitting elements 10A to 10C and the corresponding protection elements 20A to 20C will be described. The arrangement, wiring and functions of these are the same as in the above case.

Specifically, the light emitting element 10D, the protective element 20D, the second wiring 6D and the first wire 30D correspond to the light emitting element 10C, the protective element 20C, the second wiring 6C and the first wire 30C. Similarly, the light emitting element 10F, the protective element 20F, the second wiring 6F and the first wire 30F correspond to the light emitting element 10A, the protective element 20A, the second wiring 6A and the first wire 30A. Similarly, the light emitting element 10E, the protective element 20E, the second wiring 6E and the first wire 30E correspond to the light emitting element 10B, the protective element 20B, the second wiring 6B and the first wire 30B.

Furthermore, the second wire 32DF corresponds to the second wire 32CA, the second wire 32FE corresponds to the second wire 32AB, and the third wire 34E corresponds to the third wire 34B. Since it is basically the same as the above case, further detailed description is omitted.

<Emission Wavelength of Light Emitting Element>
In the light source device 2 according to this embodiment, the light emitting elements 10A and 10B emit light in the blue wavelength range, the light emitting elements 10C and 10D emit light in the green wavelength range, and the light emitting elements 10E and 10F emit light in the red wavelength range. A case of emitting light can be considered. In this case, by condensing the light reflected upwardly substantially vertically with respect to the substrate 42 by the rising mirror 50, a compact light source device that emits white light can be realized.

At this time, a second wire 32AB connecting between the protective elements 20A and 20B corresponding to the light emitting elements 10A and 10B that emit light in the blue wavelength range, and a second wire 32AB that corresponds to the light emitting elements 10F and 10E that emit light in the red wavelength range. The second wire 32FE connecting the protection elements 20F and 20E connects the top electrodes 20 of the protection elements corresponding to the light emitting elements 10 having the same emission wavelength range.

Even when the light emitting elements 10 having the same emission wavelength range are controlled individually, and when the light emitting elements 10 having the same emission wavelength range are electrically connected to control the light emitting elements 10 having the same emission wavelength range in common, surge voltage or the like may cause The current that flows from the bottom electrode to the top electrode of the protection element 20 flows through the second wire 32 and the third wire 34, which have lower electrical resistance, and then flows to the first wiring 4, so that the light emitting element 10 can be reliably protected. can.

In addition, a second wire 32CA that connects the protective element 20C corresponding to the light emitting element 10C that emits light in the green wavelength range and the protective element 20A that corresponds to the light emitting element 10A that emits light in the blue wavelength range; and the protective element 20F corresponding to the light emitting element 10F emitting light in the red wavelength range. The top electrodes of the protection elements 20 corresponding to the light emitting elements 10 having different regions are connected to each other.

The current that flows from the bottom electrode to the top electrode of the protection element 20 due to surge voltage or the like flows through the second wire 32 and the third wire 34, which have smaller electric resistance, and then flows to the first wiring 4, so that light emission with a different emission wavelength range can be obtained. Even if the upper electrodes of the protection elements 20 corresponding to the elements 10 are connected to each other, the light emitting elements 10 can be reliably protected.

In particular, the light emitting element 10D that emits light in the green wavelength range is a nitride semiconductor laser, and the light emitting element 10F that emits light in the red wavelength range is a GaAs semiconductor laser. Therefore, in the second wire 32DF that connects the protective element 20D corresponding to the light emitting element 10D that emits light in the green wavelength range and the protective element 20F that corresponds to the light emitting element 10F that emits light in the red wavelength range, the light emitting element 10D And the semiconductor material forming the light emitting element 10F is different.

Even in this case, the current flowing from the bottom electrode to the top electrode of the protection element 20 due to a surge voltage or the like flows through the second wire 32 and the third wire 34, which have smaller electric resistance, and then flows to the first wiring 4. Even if the upper electrodes of the protective elements 20 corresponding to the light emitting elements 10 made of different materials are connected to each other, the light emitting elements 10 can be reliably protected.

Also, one light-emitting element 10 may have a plurality of light-emitting points. In this case, it is possible to realize a compact light source device 2 capable of emitting light in various emission wavelength ranges. Moreover, at this time, it is preferable that one light emitting element 10 includes a plurality of electrodes. As a result, more efficient wiring can be realized, and the light source device 2 capable of emitting light in various emission wavelength ranges can be realized while being compact.

(Light source device according to the second embodiment)
Next, a light source device according to a second embodiment of the present invention will be described with reference to FIG. FIG. 5 is a perspective view schematically showing a light source device according to a second embodiment of the invention.
The light source device 2' shown in FIG. 5 is related to the first embodiment in that stepped portions 46 having surfaces positioned higher than the substrate 42 are provided on both sides in the width direction of the substrate 42 of the package 40'. It differs from the light source device 2 .

A first wiring 4 is provided on the substrate 42, and the light emitting elements 10A to 10F are mounted on the first wiring 4. FIG. Further, the second wirings 6A to 6F are provided on the surface of the step portion 46 higher than the substrate 42, and the protective elements 20A to 20F are mounted on the second wirings 6A to 6F.

Also in this embodiment, the three light emitting elements 10A to 10C and the corresponding protective elements 20A to 20C, and the three light emitting elements 10D to 10F and the corresponding protective elements 20D to 20F are arranged substantially symmetrically and connected. . Protective elements 20A to 20C corresponding to light emitting elements 10A to 10C are arranged in stepped portion 46 on one side, and protective elements 20D to 20F corresponding to light emitting elements 10D to 10F are arranged in stepped portion 46 on the other side. there is

In this embodiment, the arrangement is such that the first wires 30C and 30D are not arranged below the second wires. However, it is not limited to this, and the second wirings 6C and 6D and the protective elements 20C and 20D are arranged on the lateral side of the rising mirror 50, as in the light source device 2 according to the first embodiment. Alternatively, the first wires 30C, 30D may be arranged below the second wires 32CA, 32DF.

In this embodiment, the height at which the second wirings 6A to 6F are installed is higher than the height at which the first wirings 4 are installed due to the stepped portion 46, so that the first wires 30A and 30B can be more easily installed. , 30E, 30F may be placed below the second wires 32CA, 32AB, 32DF, 32FE.
In addition, since the first wires 30A to 30F raised from the upper electrodes of the light emitting elements 10A to 10F do not need to be lowered greatly in order to be connected to the second wirings 6A to 6F, the degree of bending of the wires is reduced. , highly reliable wiring can be realized. Similarly, in order to avoid interference with the first wires, the second wires 32CA, 32AB, 32DF, and 32FE do not need to rise significantly from the upper electrodes of the protection elements 20A to 20F, so the bending degree of the wires is reduced. , highly reliable wiring can be realized.

(Light source device according to the third embodiment)
Next, a light source device according to a third embodiment of the present invention will be described with reference to FIGS. 6 to 9. FIG. FIG. 6 is a perspective view schematically showing a light source device according to a third embodiment of the invention. FIG. 7 is a plan view schematically showing a light source device according to a third embodiment of the invention. FIG. 8 is a cross-sectional view showing the VIII-VIII cross section of FIG. FIG. 9 is a circuit diagram showing the circuit configuration of the light source device according to the third embodiment of the invention. In the circuit diagram of FIG. 9, arrows indicate that the current flows from the upper side to the lower side of the drawing.

A light source device 2'' according to the present embodiment has a package 40 and a rising mirror 50 having the same structure as the light source device 2 according to the first embodiment.
Also in this embodiment, the six light emitting elements 10P to 10U can be individually controlled, and the three light emitting elements 10P to 10R and the corresponding protective elements 20P to 20R, and the three light emitting elements 10S to 10U and the corresponding protective elements 20S to 20U are arranged substantially symmetrically and connected.

<Light emitting elements 10P to 10R>
Among the members and their wiring arranged substantially symmetrically, the three light emitting elements 10P to 10R and the corresponding protective elements 20P to 20R arranged on the lower side in FIG. 7 will be described below as an example.
The two light emitting elements 10P, 10Q and the corresponding protective elements 20P, 20Q are the same as in the first embodiment described above. The bottom electrodes of the light emitting elements 10P and 10Q are connected to the first wiring 4, and the bottom electrodes of the protection elements 20P and 20Q are connected to the second wirings 6P and 6Q corresponding to the light emitting elements 10P and 10Q. Further, the top electrodes of the light emitting elements 10P and 10Q and the protection elements 20P and 20Q have the same polarity (P electrodes).

A first wire 30P connecting between the upper surface electrode of the light emitting element 10P and the corresponding second wiring 6P is arranged below a second wire 32PQ connecting between the upper surface electrodes of the protection element 20P and the protection element 20Q. there is Similarly, a first wire 30Q connecting between the upper surface electrode of the light emitting element 10Q and the corresponding second wiring 6Q is arranged below a second wire 32PQ connecting between the upper surface electrodes of the protective element 20P and the protective element 20Q. ing. A third wire 34Q connects the upper electrode of the protective element 20Q and the first wiring 4. As shown in FIG.

Thereby, the light emitting element 10P and the light emitting element 10Q can be individually caused to emit light. Furthermore, if a surge current or static electricity occurs on the side of the second wiring 6P, the current flows from the second wiring 6P through the bottom electrode (N electrode) of the protection element 20P, the inside of the protection element 20P, and the top surface of the protection element 20P. It flows to the electrode (P electrode). Current flows from the top electrode (P electrode) of the protection element 20P to the top electrode (P electrode) of the protection element 20Q via the second wire 32PQ, and flows from the top electrode (P electrode) of the protection element 20Q to the top electrode (P electrode) of the protection element 20Q. It flows to the first wiring 4 via the 3-wire 34Q.

If a surge current or static electricity occurs on the second wiring 6Q side, the current flows from the second wiring 6Q through the bottom electrode (N electrode) of the protection element 20Q, the inside of the protection element 20Q, and the top electrode ( P electrode). Current then flows from the upper electrode (P electrode) of the protection element 20Q to the first wiring 4 via the third wire 34Q. As described above, the light emitting elements 10P and 10Q can be protected from reverse current.

The light emitting element 10R has a bottom electrode connected to the first wiring 4, and a top electrode is a P electrode like the light emitting elements 10P and 10Q. On the other hand, the protection element 20R corresponding to the light emitting element 10R is different from that of the first embodiment. The top electrode of the protection element 20R is an N electrode of opposite polarity, and the bottom electrode is connected to the first wiring 4 instead of the second wiring.
The top electrode of the light emitting element 10R and the corresponding top electrode of the protection element 20R are connected by a fourth wire 36R, and the top electrode of the protection element 20R and the individual wiring 8R corresponding to the light emitting element 10R are connected by a fifth wire 36R. They are connected by a wire 38R.

As a result, by supplying power to the individual wiring 8R, a current flows to the upper surface electrode of the protection element 20R through the fifth wire 38R, and the light emitting element 10R flows from the upper surface electrode of the protection element 20R through the fourth wire 36R. flows to the upper electrode (P electrode) of the . Then, after flowing from the top electrode (P electrode) of the light emitting element 10R to the P-type cladding layer, the active layer, and the N-type cladding layer in this order, it flows from the bottom electrode (N electrode) of the light emitting element 10R to the first wiring 4. This allows the light emitting elements 10R to emit light individually.

If a surge current or static electricity occurs in the individual wiring 8R, the current flows from the individual wiring 8R through the fifth wire 38R to the upper surface electrode (N electrode) of the protective element 20R, and flows through the inside of the protective element 20P. Then, it flows from the bottom electrode (P electrode) of the protection element 20R to the first wiring 4 . This allows the current to escape to the first wiring 4 without reverse current flowing to the light emitting element 10R.

As described above, in the present embodiment, in addition to the light emitting elements 10P and 10Q mounted on the first wiring 4 and the protective elements 20P and 20Q mounted on the second wirings 6P and 6Q, the By providing the light emitting element 10R and the protection element 20R of the opposite polarity, it is possible to realize a compact light source device 2'' that efficiently avoids interference between wires while having light emitting elements of various emission wavelength ranges. .

<Light emitting elements 10S to 10U>
Next, the light emitting elements 10S to 10U and the corresponding protection elements 20S to 20U arranged substantially symmetrically with respect to the light emitting elements 10P to 10R and the corresponding protection elements 20P to 20R will be described. The arrangement, wiring and functions are the same as in the above case.

Specifically, the light emitting element 10U, the protection element 20U, the second wiring 6U and the first wire 30U correspond to the light emitting element 10P, the protection element 20P, the second wiring 6P and the first wire 30P. Similarly, the light emitting element 10T, the protective element 20T, the second wiring 6T and the first wire 30T correspond to the light emitting element 10Q, the protective element 20Q, the second wiring 6Q and the first wire 30Q.

Similarly, the light emitting element 10S, the protection element 20S, the individual wiring 8S, the fourth wire 36S and the fifth wire 38S are connected to the light emitting element 10R, the protection element 20R, the individual wiring 8R, the fourth wire 36R and the fifth wire 38R. handle. Furthermore, the second wire 32UT corresponds to the second wire 32PQ, and the third wire 34T corresponds to the third wire 34Q. Since it is basically the same as the above case, further detailed description is omitted.

As described above, in the light source devices 2, 2′, and 2″ according to the above-described embodiments, one or more first wirings 4, a plurality of second wirings 6, and the bottom electrodes are connected to the first wirings 4. a plurality of light emitting elements 10 connected to each other, a plurality of protection elements 20 connected to the respective light emitting elements 10, the bottom electrodes of which are connected to the second wirings 6 corresponding to the respective light emitting elements 10, and the respective light emitting elements A plurality of first wires 30 connecting between the ten upper electrodes and the corresponding second wirings 6, a second wire 32 connecting between the upper electrodes of the plurality of protection elements 20, and at least one upper surface electrode of the protection element 20. and a third wire 34 connecting between the first wiring 4, the upper surface electrodes of the plurality of light emitting elements 10 and the plurality of protection elements 20 have the same polarity, and the first wire 30 is below the second wire 32 are placed in

As a result, in the light source devices 2, 2′ and 2″ capable of individually controlling the plurality of light emitting elements 10, the wires are arranged three-dimensionally using the height dimension of the protective element 20, thereby enabling the first wiring 4 to Even if the mounted light emitting element 10 and the protective element 20 mounted on the second wiring 6 are arranged close to each other, interference between the wires 30, 32, and 34 can be effectively prevented. Therefore, it is possible to provide a compact light source device 2, 2', 2'' capable of individually controlling a plurality of light emitting elements 10. FIG.

Although embodiments and embodiments of the present invention have been described, the disclosure may vary in details of construction, and changes in the combination and order of elements in the embodiments and embodiments, etc., will not affect the claimed invention. without departing from the scope and spirit of

Code description

2, 2′, 2″ light source device 4 first wirings 6, 6A to F, P, Q, T, U second wirings 8R, S individual wirings 10, 10A to F, P to U light emitting elements 20, 20A to F, P to U Protection elements 30, 30A to F, P to U First wires 32, 32A to F, P to U Second wires 34, 34B, E, Q, T Third wires 36R, S Fourth wires 38R , S fifth wires 40, 40' package 42 substrate 44 side wall 46 step portion 50 rising mirror 50A reflective surface

Claims (7)

a substrate;
a plurality of light emitting elements including a first light emitting element, a second light emitting element, and a third light emitting element disposed between the first light emitting element and the second light emitting element;
an optical component having a reflective surface that reflects light emitted from the plurality of light emitting elements and arranged to face the plurality of light emitting elements at a position away from the plurality of light emitting elements in a first direction;
three or more protective elements provided at positions away from the optical component in a direction opposite to the first direction;
a side wall bonded to the substrate and surrounding the plurality of light emitting elements, the optical component, and three or more protective elements;
between the first light emitting element and the first inner surface of the side wall located away from the first light emitting element in a direction perpendicular to the first direction, and further than the optical component; a plurality of first wirings provided at positions separated in a direction opposite to the direction;
provided between the second light emitting element and the second inner surface of the side wall facing the first inner surface and at a position spaced apart from the optical component in a direction opposite to the first direction; a plurality of second wirings;
a first wire that is bonded to one of the first wiring and the second wiring and electrically connected to the first light emitting element;
a second wire that is bonded to one of the first wiring and the second wiring and electrically connected to the second light emitting element;
and a third wire that is joined to one of the first wiring and the second wiring and electrically connected to the third light emitting element. 2. The light-emitting element according to claim 1, wherein the light-emitting elements include a light-emitting element that emits light in a blue wavelength range, a light-emitting element that emits light in a green wavelength range, and a light-emitting element that emits light in a red wavelength range. light source device. 3. The light source device according to claim 1, wherein one said light emitting element has a plurality of electrodes. 4. The light source device according to claim 1, wherein said light emitting element is a laser diode. 5. The light source device according to claim 1, wherein a bottom electrode of said protective element is connected to said first wiring or said second wiring. 6. The light source device according to any one of claims 1 to 5, wherein the first wiring and the second wiring are arranged at a position higher than a mounting surface of the light emitting element. 7. The light source device according to any one of claims 1 to 6, wherein the protective element is any one of a Zener diode, a varistor element, an ESD suppressor and an arrestor element.

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