CN212623548U

CN212623548U - Light combining device of laser projector

Info

Publication number: CN212623548U
Application number: CN202021461559.1U
Authority: CN
Inventors: 杨新生
Original assignee: Chongqing Ronghao Taishi Science And Technology Co ltd
Current assignee: Chongqing Ronghao Taishi Science And Technology Co ltd
Priority date: 2020-07-22
Filing date: 2020-07-22
Publication date: 2021-02-26
Anticipated expiration: 2030-07-22

Abstract

The utility model relates to a light combining device of a laser projector, which comprises a shell, wherein two light inlets are symmetrically arranged at the left side and the right side of the rear end of the shell, reflectors are respectively arranged in the two light inlets, a light outlet is arranged at the front end of the shell, a light bar is arranged in the cavity of the shell and longitudinally extends along an optical axis, a first radiating fin is integrally formed at the lower end of the shell, a heat conducting cover plate is arranged at the upper end of the shell, a groove is arranged on the heat conducting cover plate, a heat conducting strip is fixedly arranged in the groove, the rear end of the heat conducting strip extends out of the heat conducting cover plate and is fixedly connected with an air cooling radiator, the air cooling radiator consists of a plurality of second radiating fins, a distance for air circulation is reserved between the adjacent second radiating fins, a mounting seat is fixedly arranged in the cavity of the shell, the light bar is fixed on the mounting seat through an elastic pressing plate, the rear end of the light bar is positioned between the two reflectors, the front end, the color wheel is fixed on a rotating shaft of a motor, and the motor is fixedly connected with the shell.

Description

Light combining device of laser projector

Technical Field

The utility model relates to a laser projector field, in particular to laser projector's beam combining device.

Background

The laser projector transmits pictures by using laser beams, has the advantages of long service life, wide color gamut and the like, cannot cause the brightness of a screen to become dark due to long-time work, and has wide application prospect. The light combining device of the laser projector is a part of an optical machine, two light sources are combined into one light source through a light rod and then emitted out through a color separation filter of a color wheel, and finally emitted light beams are irradiated to an illumination imaging device of the projector for imaging. At present, the shell of the light combining device is generally provided with an integrally formed radiating fin to increase the contact area with air, and the heat on the radiating fin contacted with the air under the action of a fan arranged on the projector can be taken away by flowing air, so that the heat dissipation is realized, and the damage of parts due to overheating is prevented. However, the area of the radiating fins integrally arranged on the shell is limited, so that the contact area of the radiating fins and the air is small, the radiating capacity of the radiating fins is limited, the radiating performance of the device is influenced, the device still works in a high-temperature environment, and the service life of the device is shortened. Meanwhile, the casing of the light combining device is usually made of common steel with lower price, and the heat dissipation performance of the device is also affected due to the poor heat conductivity of the heat dissipation fins integrally arranged on the casing.

Disclosure of Invention

The utility model aims at prior art not enough, provide a laser projector's light device that closes, it is through heat conduction apron, heat conduction strip with the heat derive to the second fin heat dissipation of forced air cooling radiator by forced air cooling radiator, the nimble simple of arranging of forced air cooling radiator can fully dispel the heat to the device, has improved the heat dispersion of device.

The technical scheme of the utility model is that: a light combining device of a laser projector comprises a shell, wherein two light inlet openings are symmetrically formed in the left side and the right side of the rear end of the shell, reflectors are respectively arranged in the two light inlet openings of the shell, a light outlet opening is formed in the front end of the shell, a light bar is arranged in a cavity of the shell and longitudinally extends along an optical axis, a first radiating fin is integrally formed at the lower end of the shell, a heat conducting cover plate is arranged at the upper end of the shell, a groove parallel to the light bar is formed in the heat conducting cover plate, a heat conducting strip is fixedly arranged in the groove, the rear end of the heat conducting strip extends out of the heat conducting cover plate and is fixedly connected with an air cooling radiator, the air cooling radiator consists of a plurality of second radiating fins, a mounting seat for air circulation is reserved between every two adjacent second radiating fins, the light bar is fixedly arranged in the cavity of the shell, the light bar is fixed on the mounting seat through an elastic pressing plate, and the rear end, the light source entering from the two light inlets is reflected to the light bar through the reflectors respectively to form a uniform light source, the front end of the light bar corresponds to a color wheel, light beams at the front end of the light bar penetrate through the color wheel and are emitted out through the light outlet of the shell, the color wheel is fixed on a rotating shaft of a motor, and the motor is fixedly connected with the shell.

The lower end of the heat conduction cover plate is provided with a heat conduction boss extending downwards, the lower end of the heat conduction boss is provided with a heat conduction portion extending downwards, the lower end of the heat conduction portion is provided with a yielding groove, and the light bar is located in the yielding groove.

The heat conducting cover plate is provided with two grooves parallel to the light bars, heat conducting strips are fixedly arranged in the grooves respectively, the rear ends of the heat conducting strips extend out of the heat conducting cover plate and then transversely extend leftwards and rightwards respectively, and the transversely extending ends of the heat conducting strips are fixedly connected with the air cooling radiator.

The groove of the heat conduction cover plate is an arc groove, and the heat conduction strip is embedded in the arc groove.

The heat conducting cover plate and the heat conducting strip are made of copper or aluminum.

The elastic pressing plate is provided with an upper elastic pressing plate and a side elastic pressing plate, the optical rod is located between the elastic pressing plate and the mounting seat, the upper end face of the optical rod is pressed through the upper elastic pressing plate, the side elastic pressing plate presses the side face of the optical rod, and the optical rod is fixed on the mounting seat.

The mounting base upper end is equipped with the side shield that upwards extends, set up first cushion on the side shield, the up end of mounting base sets up the second cushion, the optical wand supports on first cushion, second cushion.

The reflector is installed on the mirror seat, be equipped with the hole of stepping down of being convenient for the reflector installation on the casing, the mirror seat lid is connected fixedly through screw and casing in this hole of stepping down.

The motor passes through the fix with screw on a mounting panel, mounting panel and casing fixed connection, the casing is equipped with and supplies mounting panel male mounting hole, and a protection cover covers the mounting hole and is connected fixedly through screw and casing.

The shell is positioned at the light outlet and is provided with a light guide cylinder, and a convex lens is arranged in the light guide cylinder.

Adopt above-mentioned technical scheme: the light source device comprises a shell, wherein two light inlets are symmetrically arranged on the left side and the right side of the rear end of the shell, reflectors are respectively arranged in the two light inlets of the shell, a light outlet is arranged at the front end of the shell, a light bar is arranged in the cavity of the shell and longitudinally extends along an optical axis, first radiating fins are integrally formed at the lower end of the shell, a heat conducting cover plate is arranged at the upper end of the shell, a groove parallel to the light bar is formed in the heat conducting cover plate, a heat conducting strip is fixedly arranged in the groove, the rear end of the heat conducting strip extends out of the heat conducting cover plate and is fixedly connected with an air cooling radiator, the air cooling radiator consists of a plurality of second radiating fins, a distance for air circulation is reserved between every two adjacent second radiating fins, a mounting seat is fixedly arranged in the cavity of the shell, the light bar is fixed on the mounting seat through an elastic pressing plate, the rear end of the light bar is positioned between the two reflectors, so that light sources entering from the two light inlets are respectively, the front end of the light bar corresponds to a color wheel, so that light beams at the front end of the light bar penetrate through the color wheel and are emitted out through a light outlet of the shell, the color wheel is fixed on a rotating shaft of a motor, and the motor is fixedly connected with the shell. The device is stable and reliable in work, the light source enters from the two light inlets of the shell and is reflected by the reflector to be emitted to the light bar to be synthesized into one light source in work, the light beam after the light bar is homogenized is emitted to the color wheel from the front end of the light bar, the color wheel mainly plays a role in filtering, and finally the light beam after passing through the color wheel is emitted from the light outlet of the shell. During operation, heat generated by the device due to light can be dissipated through the first heat sink and the air-cooled heat sink on the housing. The heat conducting cover plate can absorb heat in the shell and the shell, and simultaneously conduct the heat to the air-cooled radiator through the heat conducting strips. The second radiating fin of the air-cooled radiator and the first radiating fin of the shell are fully contacted with the air, and the air circulating in the projector takes away the heat of the first radiating fin and the second radiating fin under the action of a fan on the projector, so that the heat radiation is realized. The second radiating fins of the device are flexibly and simply arranged, the radiating area of the device is greatly increased, sufficient radiating capacity is guaranteed, the radiating performance of the air-cooled radiator is good, the device can be sufficiently radiated, the radiating effect of the device is better, and the service life of the device is prolonged. And the heat conduction cover plate, the heat conduction strips and the shell are manufactured separately, and the heat conduction cover plate and the heat conduction strips can be made of materials with good heat conduction performance, so that the heat can be efficiently led out by the heat conduction cover plate and the heat conduction strips, the heat dissipation effect is improved, and the heat dissipation performance of the device is improved.

The lower end of the heat conduction cover plate is provided with a heat conduction boss extending downwards, the lower end of the heat conduction boss is provided with a heat conduction portion extending downwards, the lower end of the heat conduction portion is provided with a yielding groove, and the light bar is located in the yielding groove. The heat conduction cover plate can better absorb heat in the shell cavity through the heat conduction boss, and can also radiate the light bar through the heat of the light bar absorbed by the heat conduction part, and the heat conduction boss and the heat conduction part are more favorable for the heat conduction cover plate to lead out the heat in the device, so that the heat radiation effect can be increased.

The heat conducting cover plate is provided with two grooves parallel to the light bars, heat conducting strips are fixedly arranged in the grooves respectively, the rear ends of the heat conducting strips extend out of the heat conducting cover plate and then transversely extend leftwards and rightwards respectively, and the transversely extending ends of the heat conducting strips are fixedly connected with the air cooling radiator. The air-cooled radiators on the two heat conducting strips have a radiating effect, so that the radiating area of the two air-cooled radiators can be increased, and the radiating performance is better.

The groove of the heat conduction cover plate is an arc groove, the heat conduction strip is embedded in the arc groove, the heat conduction strip is better contacted with the arc groove, and heat conduction between the heat conduction cover plate and the heat conduction strip is more facilitated.

The heat conduction cover plate and the heat conduction strip are made of copper or aluminum, the heat conductivity of the copper and the aluminum is good, and the good heat conductivity of the heat conduction cover plate and the heat conduction strip is guaranteed.

The elastic pressing plate is provided with an upper elastic pressing sheet and a side elastic pressing sheet, the optical rod is located between the elastic pressing plate and the mounting seat, the upper end face of the optical rod is pressed through the upper elastic pressing sheet, the side elastic pressing sheet presses the side face of the optical rod to fix the optical rod on the mounting seat, and the optical rod is well fixed by the elastic pressing plate.

The mounting base upper end is equipped with the side shield that upwards extends, set up first cushion on the side shield, the up end of mounting base sets up the second cushion, the optical wand supports on first cushion, second cushion. The first cushion block and the second cushion block facilitate the installation of the light bar on the installation seat.

The reflector is installed on the reflector seat, the shell is provided with a yielding hole convenient for installation of the reflector, and the reflector seat cover is fixedly connected with the shell through a screw in the yielding hole. During installation, the reflector is fixed on the mirror base firstly, and then the mirror base is fixed on the shell through the screw, so that the reflector is simple and convenient to install.

The motor passes through the fix with screw on a mounting panel, mounting panel and casing fixed connection, the casing is equipped with and supplies mounting panel male mounting hole, and a protection cover covers the mounting hole and is connected fixedly through screw and casing, and the mounting panel has made things convenient for the installation of motor.

The shell is positioned at the light outlet and is provided with a light guide cylinder, a convex lens is arranged in the light guide cylinder, and the light guide cylinder is used for guiding light out to the illumination imaging device of the projector.

The light combining device of the laser projector has reliable work, simple and convenient installation and good heat dissipation performance. The air-cooled radiator can radiate heat through the first radiating fins on the shell and the air-cooled radiator, the second radiating fins of the air-cooled radiator are flexibly and simply arranged, the radiating area of the device is greatly increased, sufficient radiating capacity is guaranteed, the air-cooled radiator is good in radiating performance, the device can be sufficiently radiated, the radiating effect of the device is better, and the service life of the device is prolonged. Moreover, the heat-conducting cover plate and the heat-conducting strips can be made of materials with good heat-conducting performance, so that the heat-radiating effect is improved, and the heat-radiating performance of the device is improved.

The invention is further described with reference to the drawings and the specific embodiments.

Drawings

Fig. 1 is a schematic structural view of the present invention;

FIG. 2 is a view taken in the direction B of FIG. 1;

FIG. 3 is a cross-sectional view A-A of FIG. 2;

FIG. 4 is a schematic structural diagram of a first heat sink at the lower end of the housing;

FIG. 5 is a schematic structural view of a heat conductive cover plate;

FIG. 6 is a schematic view of the mounting base cooperating with the resilient platen;

FIG. 7 is a schematic view of the motor, mounting plate and color wheel in combination;

FIG. 8 is a schematic structural view of the housing;

FIG. 9 is a schematic view of the mounting plate;

fig. 10 is a schematic optical path diagram of the light combining device of the laser projector during operation.

Detailed Description

Referring to fig. 1 to 10, an optical combining device of a laser projector includes a housing 4, two light inlets 4-2 are symmetrically disposed on the left and right sides of the rear end of the housing 4, both the two light inlets 4-2 are open at the lower end, reflectors 15 are respectively disposed in the two light inlets 4-2 of the housing 4, and each reflector 15 is respectively adjustably mounted on a mirror base 5. The casing 4 is provided with a yielding hole 4-3 convenient for installing the reflector 15, and the mirror seat 5 covers the yielding hole 4-3 and is fixedly connected with the casing 4 through a screw. During installation, the reflector 15 is fixed on the mirror base 5, and then the mirror base 5 is fixed on the shell 4 through screws, so that the reflector 15 is simple and convenient to install. The front end of the shell 4 is provided with a light outlet 4-5, the shell 4 is positioned at the light outlet 4-5 and is provided with a light guide cylinder 7 through a bolt, a convex lens 8 is arranged in the light guide cylinder 7, and the light guide cylinder 7 is used for guiding light out to a lighting imaging device of a projector. The cavity of the shell 4 is internally provided with a light bar 11, the light bar 11 longitudinally extends along an optical axis, the optical axis is the axis of the light beam, and the light bar 11 can homogenize the light. The lower end of the shell 4 is integrally formed with a first radiating fin 4-1, and the upper end of the shell 4 is provided with a heat conducting cover plate 3. Two grooves 3-1 parallel to the light bar 11 are arranged on the heat conducting cover plate 3, the grooves 3-1 are arc grooves, and fixed heat conducting strips 2 are respectively embedded in the grooves 3-1. The heat conducting strips 2 are better contacted with the arc-shaped grooves 3-1, and heat conduction between the heat conducting cover plate 3 and the heat conducting strips 2 is more facilitated. The rear ends of the heat conducting strips 2 extend out of the heat conducting cover plate 3 and then transversely extend leftwards and rightwards respectively, and the transversely extending ends of the heat conducting strips 2 are fixedly connected with the air cooling radiator 1. The air-cooled radiators 1 on the two heat conducting strips 2 have the heat dissipation function, the two air-cooled radiators 1 can increase the heat dissipation area, and the heat dissipation performance is better. The air-cooled radiator 1 is composed of a plurality of parallel second radiating fins 1-1, a space for air circulation is reserved between every two adjacent second radiating fins 1-1, and each second radiating fin 1-1 is fixed on the extending end of the heat conducting strip 2 and is perpendicular to the extending end of the heat conducting strip 2. The heat conduction cover plate 3 and the heat conduction strips 2 are made of copper or aluminum, the heat conductivity of the copper and the aluminum is good, and the good heat conductivity of the heat conduction cover plate 3 and the heat conduction strips 2 is guaranteed. The lower end of the heat conduction cover plate 3 is provided with a heat conduction boss 3-2 extending downwards, the lower end of the heat conduction boss 3-2 is provided with a heat conduction part 3-3 extending downwards, the lower end of the heat conduction part 3-3 is provided with a yielding groove 3-4, and the light bar 11 is positioned in the yielding groove 3-4. The heat conduction cover plate 3 can better absorb heat in the cavity of the shell 4 through the heat conduction boss 3-2, and can also absorb heat of the light bar 11 through the heat conduction part 3-3 to dissipate heat of the light bar 11, and the heat conduction boss 3-2 and the heat conduction part 3-3 are more beneficial to leading out heat in the device through the heat conduction cover plate 3, so that the heat dissipation effect can be increased. An installation base 10 is fixed in the cavity of the shell 4, a side baffle 10-1 extending upwards is arranged at the upper end of the installation base 10, a first cushion block 10-2 is arranged on the side baffle 10-1, a second cushion block 10-3 is arranged on the upper end face of the installation base 10, and the light bar 11 is fixed on the installation base 10 through an elastic pressing plate 9. The elastic pressing plate 9 is provided with an upper elastic pressing plate 9-1 and a side elastic pressing plate 9-2, the light bar 11 is positioned between the elastic pressing plate 9 and the mounting seat 10, the upper elastic pressing plate 9-1 presses the upper end face of the light bar 11, and the side elastic pressing plate 9-2 presses the side face of the light bar 11, so that the light bar 11 is fixedly supported on the first cushion block 10-2 and the second cushion block 10-3 of the mounting seat 10. The elastic pressing plate 9 is used for fixing the optical rod 11, and the first cushion block 10-2 and the second cushion block 10-3 facilitate the installation of the optical rod 11 on the installation base 10. The rear end of the light rod 11 is located between the two reflectors 15, so that the light sources entering from the two light inlets 4-2 are respectively reflected by the reflectors 15 to the light rod 11 to be combined into a uniform light source. A light valve for adjusting the light is arranged between the two mirrors 15 and the light bar 11, and the light valve is fixed in the housing 4. The front end of the light bar 11 corresponds to a color wheel 12, so that a light beam at the front end of the light bar 11 is emitted out through the color wheel 12 through a light outlet 4-5 of the shell 4, the color wheel 12 is fixed on a rotating shaft of a motor 13 and driven to rotate by the motor 13, and the motor 13 is fixedly connected with the shell 4. The motor 13 is fixed on a mounting plate 14 through a screw, the mounting plate 14 is provided with a via hole for the rotating shaft of the motor 13 to extend out, and the mounting plate 14 fixes the motor 13 in the shell 4 through a bolt and the shell 4 which are fixedly connected. The shell 4 is provided with mounting holes 4-4 for inserting the mounting plate 14, the mounting holes 4-4 are covered by a protective cover 6 and fixedly connected with the shell 4 through screws, the mounting plate 14 facilitates the mounting of the motor 13, and the motor 13 is connected with a control circuit board in the projector through a fixed interface on the mounting plate 14.

The light combining device is simple and convenient to mount and stable and reliable in work, a light source enters from two light inlets 4-2 of the shell 4 and is reflected by the reflector 15 and then is emitted into the light bar 11 to be combined into one light source in work, light beams homogenized by the light bar 11 are emitted onto the color wheel 12 from the front end of the light bar 11, the color wheel 12 mainly plays a role in filtering, and finally the light beams passing through the color wheel 12 are emitted from the light guide cylinder 7 of the light outlet 4-5 of the shell 4. During operation, heat generated by the device due to light can be dissipated through the first heat dissipation plate 4-1 on the shell 4 and the air-cooled heat sink 1. The heat conducting cover plate 3 absorbs the heat in the housing 4 and the housing 4, and at the same time conducts the heat to the air-cooled heat sink 1 through the heat conducting strips 2. The second radiating fins 1-1 of the air-cooled radiator 1 and the first radiating fins 4-1 of the shell 4 are fully contacted with air, and the air circulating in the projector takes away the heat of the first radiating fins and the second radiating fins under the action of a fan on the projector, so that the heat radiation is realized. The second radiating fins 1-1 of the device are flexibly and simply arranged, the radiating area of the device is greatly increased, sufficient radiating capacity is guaranteed, the radiating performance of the air-cooled radiator 1 is good, the device can be sufficiently radiated, the radiating effect of the device is better, and the service life of the device is prolonged. Moreover, the heat conducting cover plate 3, the heat conducting strips 2 and the shell 4 are manufactured separately, and the heat conducting cover plate 3 and the heat conducting strips 2 can be made of materials with good heat conducting performance, so that the heat can be efficiently conducted out by the heat conducting cover plate 3 and the heat conducting strips 2, the heat radiating effect is improved, and the heat radiating performance of the device is improved.

Claims

1. The utility model provides a laser projector's light device that closes, includes casing (4), the left and right side symmetry of casing (4) rear end sets up two and goes into light mouth (4-2), is equipped with speculum (15) in two income light mouths (4-2) of casing (4) respectively, the front end of casing (4) sets up light mouth (4-5), be equipped with a light stick (11) in casing (4) intracavity, this light stick (11) are vertically extended along the optical axis, the lower extreme integrated into one piece of casing (4) has first fin (4-1), its characterized in that: the upper end of the shell (4) is provided with a heat conduction cover plate (3), the heat conduction cover plate (3) is provided with a groove (3-1) parallel to the light bar (11), the groove (3-1) is fixedly provided with a heat conduction strip (2), the rear end of the heat conduction strip (2) extends out of the heat conduction cover plate (3) and is fixedly connected with an air-cooled radiator (1), the air-cooled radiator (1) is composed of a plurality of second radiating fins (1-1), a distance for air circulation is reserved between every two adjacent second radiating fins (1-1), a mounting seat (10) is fixed in the cavity of the shell (4), the light bar (11) is fixed on the mounting seat (10) through an elastic pressing plate (9), the rear end of the light bar (11) is positioned between two reflecting mirrors (15), so that light sources entering from the two light inlets (4-2) are respectively reflected to the light bar (11) through the reflecting mirrors (15) to synthesize a uniform light source, the front end of the light bar (11) corresponds to a color wheel (12), so that a light beam at the front end of the light bar (11) penetrates through the color wheel (12) and is emitted out through a light outlet (4-5) of the shell (4), the color wheel (12) is fixed on a rotating shaft of a motor (13), and the motor (13) is fixedly connected with the shell (4).

2. The light combining device of a laser projector according to claim 1, wherein: the heat conduction cover plate is characterized in that a heat conduction boss (3-2) extending downwards is arranged at the lower end of the heat conduction cover plate (3), a heat conduction portion (3-3) extending downwards is arranged at the lower end of the heat conduction boss (3-2), a yielding groove (3-4) is arranged at the lower end of the heat conduction portion (3-3), and the optical rod (11) is located in the yielding groove (3-4).

3. The light combining device of a laser projector according to claim 1, wherein: the light bar heat dissipation device is characterized in that two grooves (3-1) parallel to the light bar (11) are formed in the heat conduction cover plate (3), heat conduction strips (2) are fixedly arranged in the grooves (3-1) respectively, the rear ends of the heat conduction strips (2) extend out of the heat conduction cover plate (3) and then transversely extend leftwards and rightwards respectively, and the transversely extending ends of the heat conduction strips (2) are fixedly connected with the air cooling radiator (1).

4. The light combining device of a laser projector according to claim 1, wherein: the groove (3-1) of the heat conduction cover plate (3) is an arc groove, and the heat conduction strip (2) is embedded in the arc groove.

5. The light combining device of a laser projector according to claim 1, wherein: the heat conduction cover plate (3) and the heat conduction strips (2) are made of copper or aluminum.

6. The light combining device of a laser projector according to claim 1, wherein: the elastic pressing plate (9) is provided with an upper elastic pressing plate (9-1) and a side elastic pressing plate (9-2), the optical rod (11) is located between the elastic pressing plate (9) and the mounting seat (10), the upper end face of the optical rod (11) is pressed through the upper elastic pressing plate (9-1), the side elastic pressing plate (9-2) presses the side face of the optical rod (11), and the optical rod (11) is fixed on the mounting seat (10).

7. The light combining device of a laser projector according to claim 1, wherein: the light bar fixing device is characterized in that a side baffle (10-1) extending upwards is arranged at the upper end of the mounting seat (10), a first cushion block (10-2) is arranged on the side baffle (10-1), a second cushion block (10-3) is arranged on the upper end face of the mounting seat (10), and the light bar (11) is supported on the first cushion block (10-2) and the second cushion block (10-3).

8. The light combining device of a laser projector according to claim 1, wherein: the reflector (15) is installed on the reflector seat (5), the housing (4) is provided with a yielding hole (4-3) convenient for installation of the reflector (15), and the reflector seat (5) covers the yielding hole (4-3) and is fixedly connected with the housing (4) through a screw.

9. The light combining device of a laser projector according to claim 1, wherein: the motor (13) is fixed on a mounting plate (14) through screws, the mounting plate (14) is fixedly connected with the shell (4), the shell (4) is provided with mounting holes (4-4) for the mounting plate (14) to insert, and a protective cover (6) covers the mounting holes (4-4) and is fixedly connected with the shell (4) through screws.

10. The light combining device of a laser projector according to claim 1, wherein: the shell (4) is provided with a light guide cylinder (7) at the light outlet (4-5), and a convex lens (8) is arranged in the light guide cylinder (7).