JP2006186243A - Laser light source, color light source, and optical scan color projector using these sources - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method for manufacturing transparent optical light modulation devices that eliminate the need for providing through-holes on an Si board (opaque board) and do not restrict miniaturization and integration. <P>SOLUTION: This method arranges a number of semiconductor lasers such as R (Red), G (Green) and B (Blue) nearby on a support board so that they can be integrated into a single package and sealed with one cap, builds a V-shaped groove on the support board so that the condenser and optical fiber ends can be arranged there, and provides the support board with a heat sink function. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a laser light source, a color light source, and an optical scanning color projector that displays an image by scanning a light beam modulated in accordance with input pixel data using the laser light source.

In a conventional laser beam display device, a method is known in which red, green, and blue laser arrays are used and guided as individual light sources using fibers (see Patent Document 1).
Also known is a color display device in which a plurality of laser beam projection devices with different emission colors are arranged and the light beams are collected in synchronization with a projection screen or the like to obtain a composite color in addition to the laser emission color. (See Patent Document 2). According to this, it is possible to project a two-dimensional image by arbitrarily moving the condensing point and scanning the screen.
Furthermore, it is known that a semiconductor laser is used as a light source in an optical scanning image display device that displays an image by scanning a light beam modulated in accordance with input pixel data (see Patent Document 3).
US Pat. No. 6,175,440 JP 2002-214705 A JP 2003-84707 A

In the invention described in Patent Document 1, since there are a large number of light sources, there is a drawback in that the power for driving each laser increases and it is difficult to construct a small laser projector.
Further, in the invention described in Patent Document 2, a semiconductor laser is used as a laser light source, and nothing is described about miniaturizing the laser.
Furthermore, in the invention described in Patent Document 3, it is not described that a plurality of semiconductor lasers used for a light source are housed in the same passage cage and the laser light source is reduced in size.
As described above, the portable laser beam display device is required to reduce the size of the light source and the size of the optical system. However, at present, the problem is not raised in any document.

  The present invention has been made to solve these problems, and an object of the present invention is to provide a portable optical scanning color projector apparatus that realizes a three-color compact light source by allowing a plurality of semiconductor lasers to be housed in the same package cage. .

In order to solve the above-mentioned problem, the invention according to claim 1 relates to a laser light source, wherein a plurality of semiconductor lasers are arranged on a support substrate in close proximity to each other, sealed with a cap, and integrated into one package. It is characterized by storage.
According to a second aspect of the present invention, in the laser light source according to the first aspect, the semiconductor lasers are mounted on the same surface on the support substrate.
According to a third aspect of the present invention, in the laser light source according to the first or second aspect, an optical fiber end is disposed opposite to each of the semiconductor lasers.
According to a fourth aspect of the present invention, in the laser light source according to the third aspect, each condenser lens is disposed between each of the semiconductor lasers and the end of the optical fiber.
According to a fifth aspect of the present invention, in the laser light source according to the fourth aspect, the condenser lenses and the end portions of the optical fibers are arranged in a V-shaped groove formed in the support substrate.
According to a sixth aspect of the present invention, in the laser light source according to the fifth aspect, at least one of the opening angle and the depth of the V-shaped groove is made different so that the optical axes of the respective colors coincide with each other.
The invention according to claim 7 is the laser light source according to any one of claims 1 to 6, wherein the support substrate is a heat sink.
The invention according to claim 8 is the laser light source according to any one of claims 1 to 7, wherein the plurality of semiconductor lasers respectively emit R (red) light, G (green) light, and B (blue) light. It is a semiconductor laser that emits light.
A ninth aspect of the invention relates to a color light source invention, wherein a super luminescent diode is used instead of the semiconductor laser according to any one of the first to eighth aspects.
A tenth aspect of the present invention relates to an optical scanning color projector apparatus, wherein the light source according to any one of the first to ninth aspects, a movable mirror that scans light from the light source, and scanning by the movable mirror. And a screen for displaying the two-dimensional image.
According to an eleventh aspect of the invention, in the optical scanning color projector according to the tenth aspect, the movable mirror is driven by either a biaxial galvanometer mirror or a combination of two uniaxial galvanometer mirrors orthogonal to each other. It is characterized by that.
According to a twelfth aspect of the present invention, in the optical scanning color projector according to the tenth aspect, the movable mirror is driven by a polygon mirror and a galvanometer mirror.

According to the present invention, it is possible to reduce the size of the light source by integrating and mounting the lasers of the respective colors.
In addition, since the positional accuracy of the laser is increased, the alignment of the optical system is facilitated, and the cost can be reduced.
In addition, a small laser projector can be realized by reducing the size of the light source.
Further, the position of the light emitting point of each color can be determined with high accuracy by the optical fiber.
In addition, by using an optical fiber, it becomes easy to configure a layout with an optical system, an electric drive circuit, etc., and the degree of freedom of design increases.

  Hereinafter, the best mode of a three-color small light source according to the present invention will be described in detail with reference to the drawings.

FIG. 1 is a perspective view of a three-color compact light source according to Embodiment 1 of the present invention, with the cap removed. FIG. 2 is a three-view diagram of the three-color small light source of FIG. 1, wherein (a) is a front view, (b) is a side view, and (c) is a plan view.
In both figures, 10 is a three-color compact light source according to Embodiment 1 of the present invention, 11 is a stem, which is composed of a disc stem 11a and a prismatic stem 11b that stands vertically on the disc stem 11a. Yes. Reference numeral 12 denotes a support substrate provided on the prismatic stem 11b, and reference numeral 13 denotes three laser light sources mounted on the common support substrate 12, which are red (R), green (G), and blue (B ) Is emitted. 14 is a photodetector, 15 is a connection terminal, 16 is a lead wire, and 19 is a sealing cap.

  As the support substrate 12, it is preferable to use any one of silicon carbide, aluminum nitride, diamond, copper and the like to have a heat sink function. In that case, the surface of the heat sink is used by coating with a conductive metal. On the heat sink, a brazing material is formed in the bonding region of each laser by vapor deposition. As the brazing material, AuSn, In, or the like can be used. As a mounting method, the semiconductor laser chips of the respective colors are temporarily fixed at predetermined positions, and the temperature can be increased by lowering the temperature when the reaction between the brazing material and the semiconductor laser electrode occurs.

A semiconductor laser is used as the laser light source 13, and the semiconductor lasers R, G, B are adjacent to each other on the same heat sink 12 and are mounted in a junction-down manner and sealed.
As the red (R) laser light source 13R, a semiconductor laser using an InGaP or InGaAlP quantum well formed on a GaAs substrate as an active layer can be used. As the green (G) laser light source 13G, a semiconductor laser using InGaN formed on a GaN substrate as an active layer or a semiconductor laser using ZnCdSe formed on a ZnSe substrate as an active layer can be used. A blue (B) laser light source or a semiconductor laser having InGaN formed on a GaN substrate as an active layer can be used. The laser beams L from these light sources 13R to 13B are directly modulated in accordance with input image data.

By mounting the three semiconductor lasers 13R to 13B on the same heat sink 12, it is possible to reduce the size and mount the semiconductor lasers 13R to 13B, compared to the case where the individual semiconductor lasers 13R to 13B are mounted on the dedicated heat sink. Simplification.
In the first embodiment, the heat sink 12 is provided on the same surface. However, the present invention is not limited to this, and the heat sink 12 may be provided on the other side of the upper surface.

  The photodetector 14 detects the intensity of the laser beam emitted from the semiconductor laser, sends it to a light amount control unit (not shown), and controls the value of the current flowing through the semiconductor laser so as to obtain a predetermined light amount.

  The connection terminal 15 is composed of seven wires penetrating the disc stem 11a, one of which is for the common electrode of the stem through the lead wire, and three of which are for the photodetector 14 through the lead wire 161. Are used for the P-side electrode of the semiconductor laser via the lead wires 162, respectively.

  The whole stem is sealed with a sealing cap 19 to form a one package, and the laser light source is protected from dust. A transparent portion 19a is provided on the top surface of the cap, and a laser beam emitted from the semiconductor lasers 13R to 13B is transmitted therethrough.

The polarities of the semiconductor lasers are made to coincide at the time of mounting. The reflectance of the emission surface of the semiconductor laser is set to a reflectance of about 5 to 50%, preferably 15% to 30% in order to avoid the influence of the return light. The reflectance of the rear surface is preferably about 80% to 95% so that the output can be detected by the photodetector 14 disposed at the rear.
By performing the mounting as described above, since the three semiconductor lasers 13R to 13B are arranged on the same heat sink 12, the positional accuracy of the height of the emitted laser can be easily realized within ± 1 μm. I can do it. Further, the positional accuracy in the horizontal direction can be easily realized within ± 5 μm by using alignment marks.

FIG. 3 shows an application example in which the three-color small light source according to the first embodiment of the present invention is applied to an optical scanning color projector apparatus.
In the figure, 10 is a three-color compact light source according to Embodiment 1 of the present invention, 20 is a condenser lens, 30 is a deflecting means by a biaxial drive galvanometer mirror, and 40 is a screen. The deflecting means 30 has a motor 30b fixed to the apparatus frame 31, and a mounting frame 30d of the reflection mirror 30c is rotatably mounted on the rotating shaft of the motor 30b. The motor 30a is fixed to the mounting frame 30d. The reflection mirror 30c is rotatably attached to the rotation shaft of the motor 30a. The rotating shaft of the motor 30a and the rotating shaft of the motor 30b are orthogonal to each other.
Therefore, by rotating the rotating shaft of the motor 30a at a high speed, the reflection mirror 30c swings in the left-right direction, and the laser beams of the semiconductor lasers 13R to 13B swing to the left and right of the screen 40. During this time, by rotating the rotating shaft of the motor 30b at a low speed, the reflection mirror 30c is swung in the vertical direction, and the laser beams of the semiconductor lasers 13R to 13B are swung up and down on the screen 40. When the scanning on the screen 40 is reciprocated once by the reciprocating rotation of the motor 30a, the motor 30b is controlled to shift the scanning on the screen 40 downward by one pixel.

Next, the operation of this optical scanning color projector apparatus will be described.
As shown in the figure, the laser beam L emitted from the semiconductor lasers 13R to 13B is condensed by the condenser lens 20, deflected in the horizontal and vertical directions by the two-axis drive galvanometer mirror 30, and two-dimensionally displayed on the screen 40. Rendered as an image.
In this case, the biaxially driven galvanometer mirror 30 applies an R light laser beam LR (hereinafter, only the R light laser beam LR will be described) because the G light laser beam LG and the B light laser beam LB are the same. The rotating shaft is rotated clockwise by the motor 30a so as to scan in the horizontal direction from the upper left in the figure.
When the R light laser beam LR reaches the right in the horizontal direction from the left on the uppermost first row scanning line L1 in the figure of the screen 40, the mirror 30c is reversed by rotating the rotating shaft in the reverse direction by the motor 30a. Thus, the R light laser beam LR is returned to the left end of the figure, and while returning, the biaxial drive galvanometer mirror 30 rotates the rotation shaft by the motor 30b so as to lower the R light laser beam LR vertically by one pixel. Thereafter, the R light laser beam LR advances from the left to the right again in the horizontal direction on the second row scanning line L2. When reaching the right, the R light laser beam LR is similarly returned to the left end of the figure, and during this time, the R light laser beam LR is lowered by one pixel in the vertical direction. Then, the R laser beam LR travels from the left to the right again in the horizontal direction on the third row scanning line L3. Thereafter, this is repeated, and when the R light laser beam reaches the lower right while rotating the mirror 30c about two axes, it returns to the first upper left, and again scans the R light laser beam from the left to the right in the horizontal direction. Repeat this.

  The G light laser beam LG and the B light laser beam LB are also scanned in the same manner as the R light laser beam LR. On the screen 40, three spots of the R light laser beam LR, the G light laser beam LG, and the B light laser beam LB are arranged in the horizontal direction as shown in the figure to form one pixel, and the luminance of each beam is controlled appropriately. As a result, a full color can be obtained.

FIG. 4 is a block diagram of a control unit of the optical scanning color projector apparatus.
In the figure, reference numeral 50 denotes a control unit. When an image signal is input, the image control means 51 generates video signals R, G, and B to be sent to an R light source 13R, a G light source 13G, and a B light source 13B, respectively. R light modulated light, G light modulated light, and B light modulated light according to control signals from the R light source 13R, G light source 13G, and B light source 13B via the delay circuits 52R, 52G, and 52B of the pixel projection control unit 52, respectively. Is sent to the condenser lens.
At the same time, a deflection control signal is sent from the image control means 51 to the deflection driving unit 30R, and the deflection driving unit 30R drives each θx mirror driving unit 30a and θy mirror driving unit 30b so as to have angles according to the control signals. To do. In this way, a beam having a predetermined luminance is swayed at a predetermined location on the screen 40 in FIG.

  If such scanning is performed at high speed (repeating from the upper left to the lower right is at least 20 times per second, preferably 30 times or more to make it appear flicker-free), the eyeball of the person watching the bright spot The afterimage phenomenon can be recognized as a two-dimensional image, just like a television.

  Since the semiconductor lasers 13R to 13B are one-dimensionally arranged as shown in FIG. 2B, the laser beams LR, LG, and LB transmitted through the condenser lens 20 (FIG. 3) have different directions, and are reflected by the mirror 30c. The reflected laser beams LR, LG, and LB have different directions, and the laser beams LR, LG, and LB that should originally reach the same pixel reach different pixels P3, P3, and P1, respectively. According to the present invention, since the three light sources are arranged close to each other, this positional deviation is small, so there is usually no problem. However, however, when the distance from the mirror 30c to the screen 40 is long, the R, G, There is a possibility that the positional deviation of B becomes large and the resolution of the color image is deteriorated.

The delay circuits 52R, 52G, and 52B shown in the figure are circuits provided for this purpose.
By controlling the delay timing of the delay circuits 52R, 52G, and 52B by the timing control means 52S and lighting the laser beams LR, LG, and LB with respective time differences, each laser beam in the same pixel is turned on. Display is possible with image information of LR, LG, and LB. That is, in FIG. 3, when the beam for the same pixel is emitted at the same timing, the three colors are displayed at different positions P3, P2, and P1, so first the R laser beam LR is delayed by a predetermined delay through the delay circuit 52R. Later, it is projected onto a predetermined pixel P3 on the screen 40a. At that time, the other laser beams G and B that have not reached the pixel point P3 are delayed by the delay circuits 52G and 52B so as not to be turned on. Next, when the mirror 30c rotates and the G laser beam LG reaches the pixel point P3, the delay circuit 52G turns on the light. At this time, the B laser beam LB that has not reached the pixel point P3 is delayed by the delay circuit 52B so as not to be lit yet. Then, the mirror 30c further rotates so that the delay circuit 52B is turned on only when the B laser beam LB reaches the pixel point P3.
Thus, by making the delay times of the delay circuits 52R, 52G, 52B different, when each laser beam LR, LG, LB reaches the same pixel point P3, it can be lit with the image information of that pixel. Therefore, a high-resolution color image is maintained.

  As a result, the emission times of the respective laser beams LR, LG, and LB at the same pixel point P3 are shifted, but this shift is an afterimage phenomenon of human eyes (flashing of 1/30 seconds or less appears to be lit) ) No problem at all.

  In the above description, three delay circuits 52R, 52G, and 52B are used. However, the video signal of the other color is delayed with respect to the video signal of the preceding color (here, R color). Therefore, instead of providing a delay circuit for each color, only two delay circuits 52G and 52B may be provided.

  As the light deflection means, in addition to the above-described deflection means by the biaxial drive galvanometer mirror 30, two galvanometer mirrors may be used, or a combination of a polygon mirror and a galvanometer mirror may be used.

FIG. 5 shows a deflection means 34 using two galvanometer mirrors.
In FIG. 5, galvanometer mirrors 34 a and 35 a are used as deflection means, and the laser beams from the RGB light sources 10 R, 10 G, and 10 B are deflected to form an image on the screen 40. The galvano mirror 34a rotates in the θy direction to perform horizontal scanning, and the galvano mirror 35a rotates in the θx direction to perform vertical scanning. An electromagnetic motor can be used for the θy mirror driving unit 34b and the θx mirror driving unit 35b.
According to this mechanism, the relatively small galvanometer mirror 34a is used for high-speed horizontal scanning, and the relatively large galvanometer mirror 35a is used for vertical scanning. Display can be performed at a high frame rate.

FIG. 6 shows a deflecting means using a polygon mirror and a galvanometer mirror.
In FIG. 6, a polygon mirror 36 and a galvano mirror 35a are used as deflection means, and the laser beams from the RGB light sources 10R, 10G, and 10B are deflected to form an image on the screen 40. The polygon mirror 36 performs horizontal scanning by rotating in the θy direction, and vertical scanning is performed by rotating the galvano mirror 35a in the θx direction.
According to this configuration, the mirror 36a of the polygon mirror 36 is driven by the motor 36b to perform horizontal scanning, so that higher-speed scanning is possible and higher-quality images can be drawn on the screen 40.

In the present invention, the first galvanometer mirror is driven by a sine wave or pulse wave drive signal, or the second galvanometer mirror is driven by a symmetrical triangle wave drive signal, and the light beam is emitted as described above. In this case, scanning is performed two-dimensionally. At this time, while scanning the light beam from the light source based on the signal from the data rearranging means, the scanning end portion in the scanning line direction and the scanning end portion in the direction perpendicular thereto are scanned. Therefore, it is preferable to appropriately provide a blanking period 40a (FIG. 3) so as to perform desired drawing on the irradiated object 40b.
In the control unit, in order to establish a blanking period and establish a scanning start position by a beam modulated based on image data, a light beam from a light receiving element installed near the end of the horizontal or vertical scanning range of the light beam is used. Or use a signal.

  As described above, in order to make the end portion 40a (FIG. 3) in the scanning lines L1, L2, L3... Scanning in the non-drawing region, the scanning state and the timing are matched based on the rearranged image information. Based on the rearranged image information, the scanning state and timing are adjusted so that the light beam from the light source is modulated or the end portion is set as a non-drawing region in the scanning in the direction perpendicular to the scanning line direction. In addition, the light beam from the light source may be modulated.

Further, in the first embodiment, the display is performed in the forward path period L1 of the scanning line and the return path period is not displayed. However, in another optical scanning method according to the present invention, the return path period is also displayed. In the embodiment of the first galvanometer mirror 34a and the second galvanometer mirror 35a, the first galvanometer mirror 34a is used by means for rearranging the image information in units of pixels in the scan lines and scan lines in the screen. The order of the image information is reversed in units of pixels in the scanning line during the forward pass period and the backward pass period, and the image is displayed in the forward direction on the scan line L11 (FIG. 3), and is scanned and displayed in the reverse direction on the scan line L12. .
Further, the order of the image information is reversed in units of scanning lines in the screen in the forward pass period and the return pass period of the scan of the second galvanometer mirror 35a, and the light source is matched with the scanning state and timing based on the rearranged image information. When the light beam from the second galvano mirror 35a is modulated and displayed on the screen 40 by the light beam modulated by the reciprocating scanning of the first galvano mirror 34a in the forward and backward periods of the second galvano mirror 35a, the second galvano mirror 35a is displayed. Therefore, the display can be performed twice as fast as in the first embodiment.

  In the first embodiment, an example in which a semiconductor laser is used as a light source has been shown. However, the present invention is of course not limited to this, and the rear surface (reflectance: 80 to 90%)-exit surface (reflectance: 3). % Or less) A super luminescent diode SLD (Super Luminescent Diode) composed of a coat can be used.

FIG. 7 shows a three-color small light source according to Embodiment 2 of the present invention, which is sealed with a cap as in FIG. 1, but here is a perspective view without the cap. FIG. 8 is a plan view (a) of the three-color small light source of FIG. 7 and an AA sectional view (b) of (a), and FIG. 9 is a BB sectional view (a) of FIG. They are CC sectional drawing (b) and DD sectional drawing (c).
In both figures, reference numeral 100 denotes a three-color small light source according to Embodiment 2 of the present invention, and 11 denotes a stem, which is composed of a disc stem 11a and a prismatic stem 11b that stands vertically on the disc stem 11a. Yes. Reference numeral 12 denotes a support substrate provided on the prismatic stem 11b, and reference numeral 13 denotes three laser light sources mounted on the common support substrate 12, which are red (R), green (G), and blue (B ) Is emitted. 14 is a photodetector, 15 is a connection terminal, 16 is a lead wire, and 19 is a sealing cap.

  Since the same reference numerals as in the first embodiment denote the same components, the duplicate description is omitted. The second embodiment differs from the first embodiment in that a V-shaped groove 12a for a spherical condenser lens 17 is formed on a heat sink (supporting substrate) 12 made of Si, as shown in FIGS. a)) and the V-shaped groove 12b (FIG. 9C) for the optical fiber 18 are processed, and the end portions of the spherical condenser lens 17 and the optical fiber 18 are placed thereon. As described above, the condenser lens 17 is placed in the V-shaped groove 12a for the condenser lens 17 and the end of the optical fiber 18 is simply placed in the V-shaped groove 12b for the optical fiber 18. Enable precise alignment (positioning). This is because the opening angle and depth of each V-shaped groove are determined in advance so that the respective centers of the condenser lens 17 and the optical fiber 18 come to the optical axis emitted from the semiconductor laser, and the V-shaped groove is etched by V-shaped groove etching. This is because the positioning is uniquely determined only by placing the condenser lens 17 and the optical fiber 18 in each V-shaped groove. In the case of the spherical condensing lens 17, there is a risk of rolling in the V-shaped groove, which may be processed with a slight taper in the V-shaped groove or slightly supporting substrate itself during positioning. Can be easily cleared by tilting.

  On this, a brazing material for fixing the semiconductor laser chip is patterned. A semiconductor laser chip of each color is junction-down mounted on a heat sink. As the brazing material, AuSn, In, or the like can be used. The mounting method can be realized by temporarily fixing each color semiconductor laser chip at a predetermined position, raising the temperature, and lowering the temperature when a reaction between the brazing material and the laser electrode occurs.

  By using a V-shaped groove in this way, alignment of a spherical lens and an optical fiber can be performed with high accuracy, and light loss can be reduced. The spherical lens and the optical fiber can be fixed using a UV curable adhesive.

7 is used as the three-color small light source of FIG. 3, a small condensing lens is disposed at each outlet of each optical fiber instead of one condensing lens 20, and thereafter FIG. 3. By using the deflection means 30 and the screen 40, an optical scanning type color projector apparatus using the three-color small light source according to the second embodiment can be obtained.
In this case, there is a limit in bringing the semiconductor lasers 13 close to each other, but since the optical fibers can be made closer to each other, it is possible to form a three-color laser beam in which each optical axis is almost parallel. Therefore, it is not necessary to take measures such as adjusting the timing due to the time delay described in.

  In addition, although it displayed on the screen in the said Example, as another use, it can be used also for the display etc. of PC as a small optical scanning projector.

As described above, according to the present invention, each semiconductor laser of R (red), G (green), and B (blue) is disposed on the support substrate close to each other, and sealed with a cap. Since it is housed in the unit, a three-color compact light source can be obtained, and thus a compact laser projector can be obtained.
In the above embodiments, the R (red), G (green), and B (blue) semiconductor lasers are disposed on the support substrate in close proximity to each other. However, the present invention is not limited to this. Of course, other colors may be used, and a plurality of single-color or two-color semiconductor lasers may be arranged and used.
In addition, the laser package can be installed in a place where it is easy to radiate heat, and the position of the light emitting point of each color can be determined with high accuracy by using an optical fiber.
Furthermore, the use of an optical fiber makes it easier to construct a layout with an optical system, an electric drive circuit, etc., and increases the degree of freedom in design.

It is the perspective view which removed and showed the cap with the three-color small light source which concerns on Example 1 of this invention. 3A and 3B are three views of the three-color small light source in FIG. 1, in which FIG. 1A is a front view, FIG. This is an application example in which the three-color small light source according to the first embodiment of the present invention is applied to an optical scanning color projector device. It is a block diagram of the control part of a light scanning type color projector apparatus. A deflecting means using two galvanometer mirrors is shown. A deflection means using a polygon mirror and a galvanometer mirror is shown. It is the perspective view which removed the cap by the 3 color small light source which concerns on Example 2 of this invention. It is a top view (a) of the three-color small light source of FIG. 7, and AA sectional drawing (b) of (a). They are BB sectional drawing (a), CC sectional drawing (b), and DD sectional drawing (c) of Fig.8 (a).

Explanation of symbols

10 Three-color small light source 11 according to Example 1 Stem 11a Disc stem 11b Square stem 12 Support substrate (heat sink)
12a, 12b V-shaped groove 13 Laser light source 13R Red laser beam light source 13G Green laser beam light source 13B Blue laser beam light source 14 Photo detector 15 Connection terminal 16 Lead wire 17 Condensing lens 18 Optical fiber 19 Sealing cap 20 Condensing lens 30 Deflection means 40 Screen 50 Control part 51 Image control means 52 Same pixel projection control parts 52R, 52G, 52B Delay circuit 52S Timing control means 100 Three-color compact light source according to the second embodiment

Claims (12)

  A laser light source characterized in that a plurality of semiconductor lasers are arranged close to each other on a support substrate, sealed with a cap, and integrally stored in one package.   2. The laser light source according to claim 1, wherein each of the semiconductor lasers is mounted on the same surface of the support substrate.   3. The laser light source according to claim 1, wherein an optical fiber end portion is disposed opposite to each of the semiconductor lasers.   4. The laser light source according to claim 3, wherein each condenser lens is disposed between each of the semiconductor lasers and the end of the optical fiber.   5. The laser light source according to claim 4, wherein the condenser lenses and the optical fiber end portions are disposed in a V-shaped groove formed in the support substrate.   6. The laser light source according to claim 5, wherein at least one of the opening angle and the depth of the V-shaped groove is made different so that the optical axes of the respective colors coincide with each other.   The laser light source according to claim 1, wherein the support substrate is a heat sink.   8. The laser according to claim 1, wherein the plurality of semiconductor lasers are semiconductor lasers that respectively emit R (red) light, G (green) light, and B (blue) light. light source.   9. The color light source according to claim 1, wherein a super luminescent diode is used in place of the semiconductor laser.   The light source according to any one of claims 1 to 9, a movable mirror that scans light from the light source, and a screen that displays a two-dimensional image scanned by the movable mirror. Optical scanning type color projector device.   11. The optical scanning color projector according to claim 10, wherein the movable mirror is driven by either a biaxial galvanometer mirror or a combination of two uniaxial galvanometer mirrors orthogonal to each other.   11. The optical scanning color projector according to claim 10, wherein the movable mirror is driven by a polygon mirror and a galvanometer mirror.

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