JP2014182316A - Optical module, and scanning image display device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an optical module stabilizing the size of three-color beam spots and reducing relative positional deviation among the beam spots, by improving heat dissipation capacity and suppressing defocus due to thermal deformation when driving multiple lasers.SOLUTION: An optical module mounted with multiple lasers and irradiating laser beams from the multiple lasers includes: a case for mounting the optical module; the lasers; a laser holder for mounting the lasers; lenses; a lens holder for mounting the lenses; and a lens mounting member having a different material from that of the case. The lasers are closely mounted on the case via the laser holder. The lenses are mounted on the lens holder via the lens mounting member, and the lens holder is mounted on the case.

Description

  The present invention relates to an optical module and a scanning-type image display device, for example, an optical module that emits light beams from a plurality of lasers aligned on one optical axis, and an image display of the light beams from the optical module. The present invention relates to a scanning image display apparatus.

  Conventional devices having a single light source include, for example, Japanese Patent Laid-Open No. 2000-19445 (Patent Document 1) and Japanese Patent Laid-Open No. 8-146352 (Patent Document 2).

  Patent Document 1 relates to an optical scanning device, for example, a distance between a concave lens and a convex lens, which is a collimator lens, for an optical scanning device that is used in a laser printer or a plate-making output scanner and draws an image by optically scanning a photosensitive material surface. Is provided with a temperature compensation member that compensates for a positional shift caused by a change in environmental temperature.

  Further, in Patent Document 2, in a light source device used for a scanning optical device of an image forming apparatus such as a laser printer, a laser facsimile, or a digital copying machine, a focus shift due to thermal distortion at the time of temperature rise between the laser and a collimator is measured. There is a description that is solved by the insulating material provided on the side.

  Further, in recent years, development of small projectors that can be easily carried around and can be displayed on a large screen has been actively conducted. Small projectors that can be connected to notebook PCs and video cameras with built-in projectors that can project recorded images are already on the market, and those built into mobile phones and smartphones are expected to appear in the future.

  As a projector method, a type in which a lamp or LED is used as a light source and an image displayed on a liquid crystal panel or a digital micromirror device (DMD) is projected has preceded, but a laser is used as a light source. Development of laser projectors (scanning image display devices) that scan and display beam light with a movable mirror is also underway. Since laser light is used as the light source, focusing is not necessary, and it is easy to increase the brightness of the image, and it is considered suitable for use in projecting onto a handy wall on the go.

  In addition, it is also considered to develop a head-up display such as a display on a windshield, navigation display, etc., which is mounted on an automobile using the high brightness of the image.

  These use, for example, lasers of three colors, red, green, and blue, to scan a beam combining unit that couples laser beams of three colors to a synthesized beam that travels along one axis, and a deflection direction of the synthesized beam. A scanning image display apparatus having a beam scanner and capable of displaying a color image.

JP 2000-19445 A JP-A-8-146352

  In an optical module using a plurality of light beams as described above and a scanning image display apparatus having the same, a plurality of light beams, for example, three color light beams, are made to coincide with each other with high accuracy on the screen. It is important to keep the spot position and focus on disturbances caused by changes in the environment and ambient temperature.

  When the spot is out of focus, the size and position of each color spot on a display area such as a screen are shifted, causing problems such as blurring and blurring of the image.

  Therefore, when assembling the optical module, it is necessary to adjust and assemble so that the optical axes of the three colors are matched. Further, when the scanning image display device is used, the temperature rises due to the heat generated by the laser, and therefore it is necessary to ensure the heat dissipation of the laser. Since the temperature rise causes thermal deformation, it is necessary to consider the optical axis shift due to the positional shift of the optical component during the thermal deformation.

  As a laser used for the light source, a cylindrical metal package product called a CAN package is mainly used. A semi-cylindrical heat sink is connected to the tip of a cylindrical base, and a laser chip is joined to a flat surface of the heat sink via a submount and covered with a cap.

  In general, for heat radiation of the heat generated by the laser, a heat path is provided from the cylindrical base to the heat radiation portion. There is a problem that thermal deformation occurs due to temperature rise due to heat generation of the laser or ambient temperature, and the distance between the laser emission point and the lens is displaced. As long as the laser and the lens are attached to the case, the distance between the laser emission point and the lens is large when the temperature rises, and the distance is small when the temperature is low, due to the linear expansion coefficient of the case. Due to the above phenomenon, there is a problem that the spot cannot be focused on the screen, the spot becomes large, or the position is shifted.

  An object of the present invention is to provide a small optical module and a scanning image display apparatus that can reduce the position of a spot and a defocus on a display area such as a screen and have an optical component mounting structure.

  In order to solve the above problems, for example, the configuration described in the claims is adopted. The present application includes a plurality of means for solving the above-described problems. For example, the present application includes a plurality of lasers and a plurality of lenses for irradiating light beams from the plurality of lasers. A case in which the plurality of lenses and the plurality of lenses are mounted, at least one laser holder in which at least one of the plurality of lasers is mounted, and at least one in which at least one lens among the plurality of lenses is mounted. Two lens holders and at least one lens attachment member made of a material different from that of the case, wherein the at least one laser is attached to the case via the at least one laser holder, and the at least one lens is Attached to the at least one lens holder via the at least one lens attachment member, Wherein the single lens holder is attached to the casing even without.

  According to the present invention, even when the temperature rises due to heat generation during laser driving, the laser defocusing and optical axis deviation due to thermal deformation can be reduced, and the size of the laser spot on the screen can be kept constant or It is possible to provide an optical module and a scanning image display apparatus that can be of a predetermined size and that have a small relative positional deviation.

  Problems, configurations, and effects other than those described above will be clarified by the following description of embodiments.

1 is a first overall configuration diagram of a scanning image display apparatus according to an embodiment of the present invention. The principle explanatory drawing of the displacement of the light emitting point and the distance between lenses by the temperature rise of a laser. Sectional view of the laser and lens periphery according to the first embodiment of the present invention It is a perspective view which shows the 2nd Example of this invention. It is a perspective view which shows the 3rd Example of this invention. It is a perspective view which shows the 4th Example of this invention.

  Embodiments of the present invention will be described below with reference to the drawings. In addition, since the structure which attached | subjected the same code | symbol has the same function, those description may be abbreviate | omitted when already demonstrated.

  Further, in the necessary drawings, orthogonal coordinate axes including an x axis, a y axis, and a z axis are described in order to clarify the description of the position of each part.

  FIG. 1 is a block diagram of a scanning image display apparatus according to a first embodiment of the present invention.

  In FIG. 1, an optical module 101 includes a first laser 1a, a second laser 1b, and a third laser that are laser light sources corresponding to three colors of red (R) / green (G) / blue (B). 1c, a first lens 2a, a second lens 2b, and a third lens 2c that focus the light beams emitted from the respective laser light sources, and a beam combination comprising a first mirror 3a and a second mirror 3b that combine the beams. A laser light source module 100 having a portion is attached. Further, a projection unit that projects the combined beam light onto the screen 109 and a scanning unit that two-dimensionally scans the projected beam light on the screen 109 are provided. The projection unit includes a quarter wavelength plate 111, an angle of view expansion element 112, and the like.

  An image input signal 116 to be displayed is input to the video signal processing circuit 103 via the control circuit 102 including a power source and the like. The video signal processing circuit 103 performs various processes on the input image signal, and then separates it into R / G / B three-color signals and sends them to the laser light source driving circuit 104. The laser light source driving circuit 104 supplies a driving current for light emission to the corresponding laser in the laser light source module 100 according to the luminance value of each signal of R / G / B. As a result, the laser emits a light beam having an intensity corresponding to the luminance value of the R / G / B signal in accordance with the display timing.

  The video signal processing circuit 103 extracts a synchronization signal from the image signal and sends it to the scanning mirror drive circuit 105. The scanning mirror drive circuit 105 supplies a drive signal for two-dimensionally rotating the mirror surface to the scanning mirror 113 in the optical module 101 in accordance with the horizontal / vertical synchronization signal. Accordingly, the scanning mirror 113 periodically rotates the mirror surface by a predetermined angle to reflect the beam light, and scans the light beam on the screen 109 in the horizontal direction and the vertical direction to display an image.

  The front monitor signal detection circuit 106 receives a signal from the front monitor 114 and detects each output level of R / G / B emitted from the laser. The detected output level is input to the video signal processing circuit 103, and the output of the laser is controlled to be a predetermined output.

  As the scanning mirror 113, for example, a biaxial drive mirror created using MEMS (Micro Electro Mechanical Systems) technology can be used. Examples of the driving method include piezoelectric, electrostatic, and electromagnetic driving methods. Alternatively, two uniaxial drive mirrors may be prepared and arranged so that the beam light can be scanned in directions orthogonal to each other. In FIG. 1, the combined beam light is sent to the scanning mirror 113 via the reflection mirror 115.

  First, the principle of the displacement of the laser emission point and the distance between the lenses due to the temperature rise of the laser drive will be described with reference to FIG.

  The laser 1 (corresponding to any one of the first laser 1a, the second laser 1b, and the third laser 1c shown in FIG. 1) is the stem base 10, the stem cover 11, and the tip of the stem cover 11 in FIG. It is the structure protected by the transparent window part 12 installed in. As for the internal structure of the laser, a heat sink 14 having a cylindrical shape is joined to a columnar stem base 10, and a laser chip 16 is joined to a flat surface of the heat sink 14 via a submount 15. The light emitting point 17 at the tip of the laser chip 16 is configured to be located substantially on the center line of the laser 1.

  As these materials, for example, gallium arsenide is used for the laser chip 16, aluminum nitride is used for the submount 15, copper is used for the heat sink 14, iron is used for the stem base 10 and the stem cover 11, and glass is used for the window portion 12.

  The laser 1 is attached to a laser holder 18 in order to improve handling such as assembly and adjustment. The laser 1 is attached to the laser holder 18 by press-fitting or filling a gap with an adhesive or the like in order to ensure the heat dissipation of the heat generated when the laser 1 is driven. Further, the laser holder 18 is attached in close contact with the case 9. If the heat dissipation of the laser 1 is not ensured, the temperature rises when the laser 1 is driven, and the temperature is outside the guaranteed operating temperature range of the laser 1. When the operation guaranteed temperature of the laser 1 is deviated, a difference in visibility of each color occurs due to temperature-dependent laser wavelength fluctuations, causing an image color shift such as the entire screen becoming reddish, and a decrease in laser output. It also becomes a factor of shortening the life span. Here, the laser holder 18 is attached in close contact with the case 9, but another thermally conductive member may be interposed between the laser holder 18 and the case 9.

  On the other hand, the lens 2 (corresponding to any one of the first lens 2a, the second lens 2b, and the third lens 2c shown in FIG. 1) is attached to the lens holder 19 in order to improve handling such as assembly and adjustment. It is attached. By moving the lens holder 19 in the optical axis direction, in the drawing, in the y direction, the distance 21 between the light emitting point 17 of the laser 1 and the lens center 20 is moved to adjust the focal point. Further, after the lens 2 adjustment, the lens holder 19 is fixed to the case 9 with an adhesive or a spring so that the lens holder 19 does not move.

  When the laser 1 is driven with the above configuration, the heat generated in the laser 1 is conducted to the case 9 through the laser holder 18. The heat transmitted to the case 9 is conducted to the lens 2 through the lens holder 19. At this time, when the temperature of each component rises, each component expands and is displaced in a direction in which the distance 21 between the light emitting point 17 of the laser 1 and the lens center 20 increases. Due to this displacement, there is a problem that the spot on the screen cannot be focused, the spot becomes larger, and the position is shifted.

  Moreover, although the temperature rise at the time of laser driving was described, the same problem occurs when the temperature rises or falls due to the environmental temperature. In FIG. 2, the direction in which the laser beam is emitted is referred to as the y direction, and the direction in which the laser chip 16 is mounted on the heat sink 14 is referred to as the z direction.

  Hereinafter, a laser light source module 100 (see FIG. 1) according to an embodiment of the present invention will be described.

  FIG. 3 is a sectional view of the periphery of the laser and lens according to the first embodiment. Similar to FIG. 2 described above, in the laser 1, the stem base 10, the stem cover 11, and the heat sink 14 are joined to the stem base 10, and the laser chip 16 is joined to the flat surface via the submount 15. .

  The laser 1 is attached to the laser holder 18, and the laser 1 is attached to the laser holder 18 by press-fitting or filling a gap with an adhesive or the like in order to ensure the heat dissipation of heat generated when the laser 1 is driven. Further, the laser holder 18 is attached in close contact with the case 9.

  On the other hand, the lens 2 is attached to the lens holder 19, and the focal point is adjusted by moving the distance 21 between the light emitting point 17 of the laser 1 and the lens center 20 by moving the lens holder 19 in the optical axis direction, y direction in the figure. To do. Further, after the lens 1 is adjusted, the lens holder 19 is fixed to the case 9 with an adhesive or a spring so that the lens holder 19 does not move.

  Here, in order to secure heat dissipation and suppress thermal deformation associated with laser driving, the case 9, the laser holder 18, and the lens holder 19 are made of a material having good thermal conductivity such as magnesium die casting, and the case 9 is used as a heat radiating portion. In addition, the thermal deformation due to the bimetallic effect of different materials and the same material is ensured.

  When the laser 1 is driven with the above-described configuration, the temperature of each component rises due to the heat generated by the laser 1, and each component expands, and the distance 21 between the light emitting point 17 of the laser 1 and the lens center 20 increases. In order to cancel this displacement, the lens 2 is attached to the lens holder 19 through a plate-like member 22 made of a different material having a larger linear expansion coefficient than the case 9. When the member 22 expands as the temperature rises, the lens 1 is displaced in the direction 23 in which the distance 21 is narrowed, and acts in a direction to cancel the expansion displacement of the case 9. Due to the effect of the member 22, the distance 21 between the light emitting point 17 of the laser 1 and the lens center 20 when the temperature rises by driving the laser 1 can be kept constant or a predetermined distance.

  At that time, in order to cancel the increase in the distance 21 between the light emitting point 17 of the laser 1 and the lens center 20, the member 22 needs to be mounted on the lens holder 22 by disposing the member 22 on the side far from the laser 1. There is. Here, on the laser 1 side, a member (for example, a resin member) having a high linear expansion coefficient such as the member 22 cannot be disposed in order to ensure heat dissipation. This is because the temperature of the laser 1 is increased, leading to deterioration of laser performance and image quality.

  By using the above-described configuration, the distance 21 between the light emitting point 17 of the laser 1 and the lens center 20 when the laser 1 is driven can be kept constant or a predetermined distance, and the laser defocusing and optical axis misalignment can be reduced. It is possible to provide a scanning image display apparatus including an optical module in which the spot size can be constant or a predetermined size and the relative positional deviation is reduced.

  Here, the lens 2 refers to a collimator lens or the like. Further, as shown in FIG. 3, the member 22 is a plate-like member having a rectangular cross-sectional shape, but may be a ring-like shape as will be described later.

  Further, in the embodiments, the description has been given focusing on one of a plurality of lasers and one lens of a plurality of lenses, but other lasers of a plurality of lasers and other ones of a plurality of lenses. This lens can be applied to these lenses based on the same technical idea.

  FIG. 4 is a perspective view showing a second embodiment of the present invention. With reference to FIG. 4, the structure of the member 25, which is a modification of the member 22 having a different material having a larger linear expansion coefficient than the case 9, will be described.

  The laser 1 is attached to a laser holder 18 in order to improve handling such as assembly and adjustment. The laser 1 is attached to the laser holder 18 by press-fitting or filling a gap with an adhesive or the like in order to secure heat dissipation of heat generated when the laser 1 is driven. The laser holder 18 is also attached in close contact with the case 9.

  On the other hand, the lens 2 is attached to the lens holder 19 in order to improve handling such as assembly and adjustment. By moving the lens holder 19 in the optical axis direction (y direction in the figure), the distance 21 between the light emitting point 17 of the laser 1 and the lens center 20 is moved to adjust the focal point. Therefore, a V-shaped groove 24 is provided in the case 9 so that the lens holder 19 can move only in the optical axis direction, and the lens holder 19 can move thereon.

  The lens 2 is attached to the lens holder 19 with a spring 33 (denoted by a broken line in the figure) via a member 25 having a ring-shaped plate provided with three projections 31a to 31c and 32a to 32c on both surfaces. It has been. This configuration is particularly suitable for fixing the lens 2 when the surface of the lens 2 on the laser light source side protrudes in the optical axis direction with respect to the lens holder 19.

  The protrusions of the member 25 are arranged on the same axis as a pair of protrusions 31a and 32a on both the mounting surface of the lens 2 and the lens holder mounting surface, and the member 25 is mounted on the mounting surface of the lens holder 19 and the lens 2. It has a structure that can be mounted stably. When the member 25 is stably attached, the tilt and displacement of the lens 1 due to a disturbance such as a temperature rise of heat generated by laser driving can be suppressed.

  Further, when the spring 33 is pressed against the lens holder 19 from the lens 2 side at three locations 34a to 34c in the direction connecting the pair of protrusions 31a to 31c and 32a to 32c, deformation due to the spring pressing of the member 22 is reduced. The inclination and displacement of the lens 1 can be suppressed.

  By making the distance 21 between the light emitting point 17 of the laser 1 and the lens center 20 constant or a predetermined distance and suppressing the tilt or displacement of the lens 1, the size of the spot on the screen can be made constant or a predetermined size. It is possible to provide a scanning image display device including a laser light source module with a small positional deviation.

  Here, by providing a protrusion or a notch in a part of the lens mounting plane direction (zx plane in the figure) of the member 25 according to the lens holder 19, the rotation of the member 25 is suppressed and the position for suppressing the spring is shifted. You may make it not. Since the protrusions 31a to 31c and 32a to 32c coincide with the spring pressing position by the lens mounting plane direction protrusion, the deformation of the member 25 due to the spring 33 pressing can be reduced, and the inclination and displacement of the lens 1 can be suppressed. it can.

  FIG. 5 shows the member 22 and the structure around the member 22 according to the third embodiment.

  In place of the protrusions 31a to 31c of the member 25 shown in FIG. 4 of the second embodiment, the protrusions 36a to 36c are provided on the lens holder 35 side, and similarly, the protrusion 32a of the member 25 shown in FIG. 4 of the second embodiment. Instead of ˜32c, the protrusions 38a to 38c are provided on the spring 37 side. Here, the member 22 is a ring-shaped plate.

  With the above structure, the member 22 is stably attached, and the tilt and displacement of the lens 1 due to disturbance such as a temperature rise of heat generated by driving the laser 1 can be suppressed. When the projections 36a to 36c are provided on the lens holder 35 and the projections 38a to 38c are provided on the spring 37, the positions of the projections 36a to 36c and 38a to 38c are arranged in a part of the member 22 in the lens mounting plane direction (zx plane in the drawing). They can be matched without providing protrusions or notches, and the deformation of the member 22 due to the spring pressing can be reduced.

  As in the second embodiment, the laser spot on the screen can be controlled by making the distance 21 between the light emission point 17 of the laser 1 and the lens center 20 constant or a predetermined distance and suppressing the tilt and displacement of the lens 1 as in the second embodiment. It is possible to provide a scanning-type image display device including an optical module in which the size of the optical module is constant or a predetermined size and the relative positional deviation is reduced.

  FIG. 6 shows the member 22 and the structure around the member 22 according to the fourth embodiment.

  A V-shaped groove 24 is provided on the case 9 side so that the lens holder 39 can move only in the optical axis direction, and the lens holder 39 can move on the groove 24. A groove 43 similar to the V-shaped groove 24 is provided in the lens holder 39, and the lens 2 is attached to the V-shaped groove 43 by pressing with a spring 40. For this reason, the spring 40 is provided with a pressing portion 42 having a structure for pressing the lens side surface, and protrusions 41a to 41c similar to the protrusions 36a to 36c of the third embodiment are provided. The lens holder 39 has a hole in the lens holder 39 so that the pressing portion 42 of the spring 40 passes. By mounting the lens 1 by pressing it against the groove 43 of the V-shaped lens holder 39, the lens 1 is not displaced in a plane (zx plane) having the optical axis as a normal line. Therefore, the distance 21 between the light emitting point 17 of the laser 1 and the lens center 20 can be made constant or predetermined, and the inclination and displacement of the lens 2 can be suppressed, so that the size of the laser spot on the screen is made constant or predetermined. Therefore, it is possible to provide a scanning image display device including an optical module in which the relative positional deviation is reduced. In particular, a structure suitable for a miniaturized optical module and a scanning image display device can be provided.

  Although the present invention has been described with reference to an optical module using a laser, an optical module using an LED (Light Emitting Diode) or a lamp other than the laser as a light source may be used.

  In addition, this invention is not limited to an above-described Example, Various modifications are included. For example, the above-described embodiments have been described in detail for easy understanding of the present invention, and are not necessarily limited to those having all the configurations described. Further, a part of the configuration of one embodiment can be replaced with the configuration of another embodiment, and the configuration of another embodiment can be added to the configuration of one embodiment. Further, it is possible to add, delete, and replace other configurations for a part of the configuration of each embodiment.

Each of the above-described configurations, functions, processing units, processing means, and the like may be realized by hardware by designing a part or all of them with, for example, an integrated circuit. Each of the above-described configurations, functions, and the like may be realized by software by interpreting and executing a program that realizes each function by the processor. Information such as programs, tables, and files for realizing each function can be stored in a recording device such as a memory, a hard disk, an SSD (Solid State Drive), or a recording medium such as an IC card, an SD card, or a DVD.
Further, the control lines and information lines indicate what is considered necessary for the explanation, and not all the control lines and information lines on the product are necessarily shown. Actually, it may be considered that almost all the components are connected to each other.

  1a ... 1st laser, 1b ... 2nd laser, 1c ... 3rd laser, 2a ... 1st lens, 2b ... 2nd lens, 2c ... 3rd lens, 3a ... 1st mirror, 3b ... 2nd mirror, 9 ... Case: 10 ... Stem base, 11 ... Stem cover, 12 ... Window, 14 ... Heat sink, 15 ... Submount, 16 ... Laser chip, 17 ... Light emitting point, 18 ... Laser holder, 19 ... Lens holder, 20 ... Center of lens , 21 ... distance, 22 ... member, 23 ... direction, 24 ... groove, 25 ... member, 31a to 31c ... projection, 32a to 32c ... projection, 33 ... spring, 34a to 34c ... location, 35 ... lens holder, 36a to 36c ... projection, 37 ... spring, 38a-38c ... projection, 39 ... lens holder, 40 ... spring, 41a-41c ... projection, 42 ... pressing part, 43 ... groove, 100 ... laser light source module, 10 DESCRIPTION OF SYMBOLS ... Optical module, 102 ... Control circuit, 103 ... Video signal processing circuit, 104 ... Laser light source drive circuit, 105 ... Scanning mirror drive circuit, 106 ... Front monitor signal detection circuit, 109 ... Screen, 111 ... 1/4 wavelength plate, 112: Angle of view enlargement element, 113: Scanning mirror, 114: Front monitor, 115: Reflection mirror.

Claims (10)

A plurality of lasers, and a plurality of lenses for irradiating light beams from the plurality of lasers,
A case in which the plurality of lasers and the plurality of lenses are mounted;
At least one laser holder carrying at least one laser of the plurality of lasers;
At least one lens holder on which at least one lens of the plurality of lenses is mounted;
Having at least one lens mounting member made of a material different from the case;
The at least one laser is attached to the case via the at least one laser holder;
The at least one lens is attached to the at least one lens holder via the at least one lens attachment member;
The optical module, wherein the at least one lens holder is attached to the case. In claim 1,
The optical module, wherein the at least one laser is attached in close contact with the case via the at least one laser holder. In claim 1 or claim 2,
The optical module according to claim 1, wherein the at least one lens mounting member is made of a material having a linear expansion coefficient different from that of the case. In any one of Claims 1 thru | or 3,
The case, the at least one laser holder and the at least one lens holder are made of the same material,
The optical module, wherein the at least one lens mounting member is made of a material different from the same material. In any one of Claims 1 thru | or 4,
The optical module according to claim 1, wherein the at least one lens mounting member has a pair of three-point protrusions on both the surface on which the lens is mounted and the surface on which the lens is mounted. In claim 5,
A spring that presses on the same axis connecting the pair of protrusions on both sides of the three-point protrusion, and the at least one lens is moved by the spring to the at least one lens holder via the at least one lens mounting member; An optical module that is mounted on In any one of Claims 1 thru | or 4,
The lens mounting surface of the at least one lens holder has three projections, and the spring used for mounting the at least one lens also has three projections, and the at least one lens is the spring. An optical module, wherein the optical module is attached by being pressed against the at least one lens holder via at least one lens attaching member. In claim 7,
The three-point protrusions on the lens mounting surface of the at least one lens holder and the three-point protrusions of the spring used for mounting the at least one lens are on the same axis, one point each. module. In any one of Claims 1 thru | or 8,
An optical module comprising a V-shaped groove in the at least one lens holder and a spring for pressing a side surface of the at least one lens. An optical module according to any one of claims 1 to 9,
And a controller that controls the optical module by receiving an image input signal, and controls the light emission of the plurality of lasers to display an image.

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