WO2021049708A1

WO2021049708A1 - Laser indication device

Info

Publication number: WO2021049708A1
Application number: PCT/KR2019/014090
Authority: WO
Inventors: 조성우
Original assignee: 조성우
Priority date: 2019-09-10
Filing date: 2019-10-24
Publication date: 2021-03-18
Also published as: KR102264838B1; KR20210030779A

Abstract

The present invention relates to a laser indication device comprising: housings (10, 20) having an emission opening (10') formed on front surfaces thereof, and an operation switch (11) provided on outer surfaces thereof; a laser light source part (32) provided inside the housings (10, 20) so as to emit laser light; a battery (31) provided on the back surface of the laser light source part (32) so as to supply power to the laser light source part (32); a refraction lens (41') for refracting the laser light in front of the laser light source part (32); and a light conversion module (40) which is linked with the movement of the operation switch (11) so as to be refracted by the refraction lens (41') and which adjusts the length of the linear light source emitted through the emission opening (10'). The laser indication device of the present invention allows a user to operate an operation unit so as to freely adjust the length of the light source of the laser light and emit laser light, thereby improving the convenience of use of the laser indication device and expanding the usable range of the laser indication device.

Description

Laser display

The present invention relates to a laser display device, and more particularly, to a laser display device that enables a user to emit light by adjusting the length of a line light source using a laser at a desired point.

In general, a laser display device is used for indicating a spaced position or measuring a level by using a laser. As an example, a laser pointer, which is one of the laser display devices, has a lens in front of the laser diode, and a battery that is a power source and a switch that supplies and cuts off the power of the battery. The laser pointer is operated in such a way that when a user operates a switch and the power of the battery is supplied to the laser diode, the laser diode is turned on and the laser is irradiated to the front of the laser pointer.

Such a laser pointer plays the role of an indicator bar indicating charts or presentation screens at conferences, construction sites, and briefing sessions.

Conventional laser pointers only point at a point in a spaced apart position, and there is an inconvenience in that a separate filter must be used in order to display a line or pattern desired by the user.

It is an object of the present invention to provide a laser display device in which a user can adjust the length of an emitted line light source.

According to the features of the present invention for achieving the object as described above, the present invention provides a housing having an exit hole formed on the front side and an operation switch on the outer surface thereof, and a laser installed inside the housing to irradiate laser light. A light source unit, a battery installed at the rear of the laser light source unit to supply power to the laser light source unit, a refractive lens that refracts the laser light into a line light source at the front surface of the laser light source unit, and the operation switch is interlocked with the movement of the It includes an optical conversion module that adjusts the length of the line light source.

The optical switching module includes a movable switching unit that is interlocked with the operation switch to perform linear reciprocating motion, and a driven switching unit that adjusts the length of the line light source emitted through the exit while linearly moving in a direction opposite to the movement direction of the movable switching unit. And, between the movable switching unit and the driven switching unit includes a support for changing the direction so that the movable switching unit and the driven switching unit move in different directions.

The movable switching unit includes a movable switching arm extending in one direction and having movable switching racks formed on both outer surfaces of the movable switching unit, and a switch fixing unit extending from one side of the movable switching unit and having a shaft groove into which a connecting shaft provided in the operation switch is inserted. In addition, the driven switching unit includes a pair of driven switching arms having a driven switching rack formed on a surface facing each other, and a driven switching plate extending from one side of the driven switching arm and elastically deformed, and the support is the laser light source unit It is installed on the upper end and includes a support for supporting the movable switching unit and the driven switching unit, and a fixed end to which a pinion is rotatably installed between the movable switching rack and the driven switching rack.

On the inner surface of the housing, a pair of guide rails are formed symmetrically toward the exit, and the driven switching plate is movably coupled with the lower rail so that when the movable switching unit moves in one direction, the driven switching plate is linked thereto. It moves along the guide rail.

The pair of guide rails is formed such that the distance between the pair of guide rails becomes narrower or further away toward the exit port.

The guide rail is formed in parallel with the inner guide and the outer guide separated by a predetermined distance, and the driven switching plate is seated between the inner guide and the outer guide to reciprocate.

The housing further includes a circuit board on which a charging terminal for supplying power to the battery is formed.

A cantilever-shaped coupling arm protrudes toward the exit hole on the circuit board, and the optical conversion module is installed on the coupling arm.

The laser display device according to the present invention as described above has the following effects.

In the laser display device according to the present invention, the user can freely adjust and irradiate the length of the light source of the laser light by manipulating the operation unit, thereby improving the usability of the laser display device and expanding the scope of use of the laser display device. .

According to the present invention, after converting laser light from a point light source to a line light source form using a refractive lens, it is irradiated in the form of a line light source whose length is adjusted by the shape of the optical conversion module and the exit port. Therefore, since only a single lens is used and the shape of the laser light is controlled by the optical conversion module, there is an effect of reducing the cost.

1 is an external perspective view of a housing constituting a laser display device according to the present invention.

2 is an exploded perspective view of a laser display device according to an embodiment of the present invention.

3 is an exploded perspective view of an optical conversion module according to an embodiment of the present invention.

Figure 4 is a perspective view showing the inside of the upper housing of the embodiment of the present invention.

5 is a cross-sectional view of the internal configuration of a housing when the laser display device according to the embodiment of the present invention emits a short line light source.

6 is an exploded perspective view of an internal configuration of a housing when the laser display device according to the embodiment of the present invention emits a long point light source.

Hereinafter, some embodiments of the present invention will be described in detail through exemplary drawings. In adding reference numerals to elements of each drawing, it should be noted that the same elements are assigned the same numerals as possible, even if they are indicated on different drawings. In addition, in describing the embodiments of the present invention, if it is determined that a detailed description of a related known configuration or function obstructs the understanding of the embodiments of the present invention, the detailed description thereof will be omitted.

In addition, in describing the constituent elements of the embodiments of the present invention, terms such as first, second, A, B, (a), and (b) may be used. These terms are for distinguishing the constituent element from other constituent elements, and the nature, order, or order of the constituent element is not limited by the term. When a component is described as being "connected", "coupled" or "connected" to another component, the component may be directly connected or connected to that other component, but another component between each component It should be understood that may be “connected”, “coupled” or “connected”.

A preferred embodiment of the laser display device of the present invention will be described with reference to the drawings.

First, a configuration of a laser display device according to an embodiment of the present invention will be described.

In the laser display device 1, a housing forms an exterior. The

housings

10 and 20 constituting the laser display device 1 are formed to be elongated to one side, and a slit-shaped exit port 10' is formed at a front end of one side in the longitudinal direction. In the

housings

10 and 20, an upper housing 10 and a lower housing 20 are coupled, and a laser light source is emitted from the exit port 10'. A component is mounted on the lower housing 20, and the upper housing 10 serves as a cover covering the lower housing 20. Meanwhile, in the laser light source, when the operation switch 11 formed on the upper housing 10 is operated, the length of the line light source of the laser light source is adjusted.

A switch seating groove 12 is concave in the upper housing 10 near the exit port 10' along the longitudinal direction of the housing. The operation switch 11 is seated in the switch seating groove 12, and the switch seating groove 12 is formed by being recessed, so that the degree of protrusion of the operation switch 11 to the outside of the upper housing 10 is increased. Is minimized.

A guide hole 12 ′ is formed in the switch seating groove 12 along the longitudinal direction of the

housings

10 and 20. The guide hole 12 ′ limits a range in which the operation switch 11 can be moved substantially.

A connection shaft 13 is connected to the operation switch 11. The connection shaft 13 is connected to the movable conversion part 42 installed inside the

housings

10 and 20 to be described later. When the user manipulates the operation switch 11, the movable switching unit 42 is also interlocked and moved by the connection shaft 13. At this time, since the connection shaft 13 passes through the guide hole 12 ′ and is connected to the movable switching unit 42, the movable range of the operation switch 11 and the movable switching unit 42 is Limited by (12').

A cover 14 may be further installed in the switch seating groove 12. The cover 14 shields the guide hole 12 ′ from being exposed to the outside, thereby blocking entry of foreign substances from the upper housing 10. The cover 14 may be installed to surround the manipulation switch 11. That is, the cover 14 is installed in the switch seating groove 12 so as to surround the edge of the operation switch 11 and the guide hole 12 ′ is shielded.

Inside the upper housing 10, a pair of guide rails 23 are formed to be symmetrical to each other near the exit port 10'. The guide rail 23 is formed in parallel with each other by a predetermined distance between the inner guide 23a and the outer guide 23b. The inner guide 23a and the outer guide 23b are formed to face each other in a pair. Between the inner guide (23a) and the outer guide (23b), a driven switching plate (43c) to be described later is seated and reciprocates along the guide rail (23).

The guide rail 23 is so that the distance between the pair of inner guides 23a and the outer guides 23b formed to face each other from the inside of the upper housing 10 toward the exit port 10' Is formed. In the pair of guide rails 23, the distance between the guide rails 23 may be gradually narrowed or may be continuously narrowed. In this embodiment, the pair of guide rails 23 are formed to have a substantially semicircular shape and continuously narrow the width. Conversely, the pair of guide rails 23 may be formed such that the distance between the pair of guide rails 23 increases from the inner space of the upper housing 10 toward the exit port 10'. .

A component seating space 21 and a module seating space 22 are formed in the lower housing 20, and a lower guide 23c is formed near the exit port 10'. Specifically, a lower guide 23c, a module seating space 22, and a component seating space 21 are formed in a line from the exit port 10'. Electronic components including the circuit board 30 are integrally seated in the component seating space 21, and the optical conversion module 40 is seated in the module seating space 22.

A pair of the lower guides 23c are formed to be symmetrical to each other on the bottom surface of the lower housing 20. The lower guide 23c is formed to correspond to the shape of the inner guide 23a and the outer guide 23b of the guide rail 23 to guide the movement of the driven conversion plate 43c.

The circuit board 30 has a plate shape elongated in one direction to correspond to the shapes of the upper housing 10 and the lower housing 20. Various electronic components are mounted on the circuit board 30. By means of circuits and electronic components installed on the circuit board 30, the laser display device 1 emits a laser light source, as well as a charging function and a remote control module 35 through the charging terminal 33 of the laser display device 1 ) To perform more remote control functions. In addition, since the Bluetooth module 34 is additionally provided, the remote control function can be used in conjunction with more various products.

A coupling arm 30a is formed at the front end of the circuit board 30 facing the exit port 10'. The coupling arm 30a extends in a cantilever shape and is formed to be narrower than the width of the circuit board 30 to be externally distinguished from the circuit board 30. A support part 41 of the optical conversion module 40 to be described later is installed on the coupling arm 30a.

A power supply unit protrudes from the circuit board 30 in a direction perpendicular to the length direction of the circuit board 30. A power switch is connected to the power supply unit to externally turn on/off the power of the laser display device 1.

A battery 31 is installed at the lower end of the circuit board 30. The battery 31 is electrically connected to the circuit board 30 and can be charged by an external power source, and supplies power for emitting laser light and power for performing a remote control function. The battery 31 may also have a bar or cylinder shape extending to one side to correspond to the shape of the upper housing 10 and the lower housing 20.

A laser light source unit 32 is installed at the lower end of the circuit board 30. The laser light source unit 32 is installed to face the exit port 10 ′ in parallel with the battery 31. The laser light source unit 32 is located at the lower end of the coupling arm 30a. The laser light source unit 32 receives power from the battery 31 and emits a laser light toward the exit port 10'.

An optical conversion module 40 is installed at one end of the circuit board 30 on which the coupling arm 30a is formed. The optical conversion module 40 adjusts the shape (length) of light emitted to the line light source through the exit port 10'. The optical conversion module 40 includes a support part 41, a movable switch part 42, and a driven switch part 43, and the laser light source part by a refractive lens 41 ′ installed on the support part 41 The point light source emitted from (32) is refracted and converted into a line light source. The refractive lens 41 ′ may have irregularities that draw a waveform on the surface of the lens. Specifically, the shape of the irregularities is similar to the shape in which the irregularities are formed so as to cross the width of the refractive lens 41 ′, and a shape in which a plurality of grooves are formed so as to cross the width of the refractive lens 41 ′. However, the refractive lens 41 ′ has a wave-shaped cross section. Accordingly, the refractive lens 41 ′ is disposed in a longitudinal direction in which the irregularities are formed parallel to the extension direction of the exit hole 10 ′. Since the exit port 10' has a slit shape, the length of the line light source is adjusted while passing through the exit port 10'. The optical conversion module 40 adjusts the shape (length) of light emitted from the line light source. When the movable switching unit 42 is operated, the driven switching unit 43 is moved in conjunction with the movement of the movable switching unit 42, and the length of the line light source is adjusted according to the movement of the driven switching unit 43. will be.

When the configuration of the optical conversion module 40 is described in detail, a support part 41 is installed on the coupling arm 30a of the circuit board 30. The movable conversion part 42 to be described later is mounted on the support part 41, and a refractive lens 41 ′ for refracting light emitted from the laser light source part 32 is also installed.

Specifically, the support portion 41 is formed with a support (41a) extending toward the exit hole (10'). The support 41a has a plane parallel to the bottom of the lower housing 20 and extends toward the exit port 10'. The movable switch 42 is seated on the upper surface of the support 41a. The support (41a) is formed to be spaced a predetermined distance from the bottom surface of the lower housing (20).

Fixed ends 41b are formed on both sides of the support member 41a in the longitudinal direction. The shaft 41c' of the pinion 41c is rotatably coupled to the fixed end 41b. The pinion 41c is erected at the fixed end 41b in a direction perpendicular to the longitudinal direction of the

housings

10 and 20.

The pinion 41c is installed to be rotatable at the fixed end 41b and rotates in engagement with the movable switching rack 42b and the driven switching rack 43b, which will be described later. The shaft 41c' becomes a rotation shaft of the pinion 41c, and the tip of the shaft 41c' is installed to be rotatable at the fixed end 41b. The pinion 41c is installed between the movable changeover rack 42b and the driven changeover rack 43b to transmit a driving force to the driven changeover rack 43b in a direction opposite to the movement direction of the movable changeover rack 42b.

A lens support end 41d is formed at the lower end of the support 41a. The lens support end 41d is integrally formed with the supporter 41a so as to be positioned between the supporter 41a and the bottom surface of the lower housing 20. A refractive lens 41 ′ is installed at the lens support end 41d and is disposed on the front surface of the laser light source unit 32. The lens support end 41d may be formed in a shape of a guide (not shown) so that the refractive lens 41 ′ can be inserted into the slide.

The support part 41 is installed to be coupled to the coupling arm 30a, but fastening ends 41e may be formed on both sides of the support member 41a in the longitudinal direction. A fastening device such as a bolt is inserted into the fastening end 41e to more firmly couple the inner housing and the support part 41.

The upper end of the support part 41 and a part of the circuit board 30 are provided with a movable switching part 42 capable of reciprocating motion. The movable switch 42 is formed with a bar-shaped movable switch 42a extending long in one direction. The movable switching arm (42a) is installed on the upper end of the support (41). The movable switching arm 42a reciprocates along the longitudinal direction of the

housings

10 and 20 and drives the driven switching portion 43.

Movable switching racks 42b are formed on the outer surfaces of both sides of the movable switching arm 42a. The movable switching rack 42b engages with the pinion 41c to drive the driven switching unit 43. This driving method will be described in detail later.

A switch fixing part 42c is formed at a rear end of the movable switching arm 42a and a part of the circuit board 30. The switch fixing part 42c has a bar shape that extends long in one direction like the movable changeover arm 42a, and the movable changeover arm 42a and the movable changeover rack 42b are It is distinguished externally. A shaft groove 42 ′ is formed in the switch fixing portion 42c, and the connection shaft 13 is coupled to the shaft groove 42 ′, thereby forming a mechanical coupling with the operation switch 11.

The driven switching unit 43 is driven in association with the movement of the movable switching unit 42. The driven switching unit 43 is deformed in shape along the guide rail 23 formed in the upper housing 10 and the lower housing 20, and adjusts the length of the line light source emitted toward the exit port 10'. do.

The driven switching portion 43 is formed by connecting a pair of the driven switching arm 43a and the driven switching plate 43c integrally formed by a connecting portion 43'.

The driven switching arm (43a) extends along the longitudinal direction of the housing (10, 20). The driven switching arm 43a may also be formed in a bar shape, and a driven switching rack 43b is formed on a surface of the pair of driven switching arms 43a facing each other. The driven switching rack 43b is engaged with the pinion 41c and is interlocked with the movement of the movable switching unit 42 to move in a direction opposite to the moving direction of the movable switching unit 42.

A driven switching plate 43c is integrally extended at the front end of the driven switching arm 43a. The driven switching plate 43c is formed to have a wide surface in the shape of a thin plate, and a pair of wide surfaces of the driven switching plate 43c is formed to face each other. The driven switching plate 43c is formed in a thin plate shape to facilitate deformation. The driven switching plate 43c may be formed of a reflective material. Alternatively, a thin plate shape that is easily deformable, and a reflective film may be attached to a surface of the pair of driven switching plates 43c facing each other. One side of the driven switching plate 43c is formed to be in contact with the bottom surface of the lower housing 20, and its front end is coupled to the lower guide 23c so that it is movable along the lower guide 23c. The length of the line light source emitted through the exit port 10' is determined according to the angle at which light is reflected on the driven switching plate 43c.

In this embodiment, the driven switching plate 43c is guided by an inner guide 23a, an outer guide 23b, and a lower guide 23c of the guide rail 23 to reciprocate. Specifically, the upper part of the driven conversion plate 43c is seated between the inner guide 23a and the outer guide 23b formed on the upper housing 10, and the lower part of the driven conversion plate 43c is the lower housing. It is supported by the lower guide 23c of (20). When the operation switch 11 is operated so that the movable switching unit 42 reciprocates, the driven switching plate 43c is deformed to correspond to the shape of the guide rail 23, and from the exit port 10' Moving away or getting closer.

However, it is not limited to this embodiment, and the coupling between the driven switching plate 43c and the guide rail 23 may be changed in various ways. For example, the guide rail 23 may be formed only on either the upper housing 10 or the lower housing 20. A guide pin protrudes toward the lower housing 20 at one end of the driven switching plate 43c, and the guide pin may be coupled to the lower guide 23c so as to be movable. In addition, a channel is formed in the lower housing 20 so that the driven switching plate 43c is inserted, so that one side of the driven switching plate 43c may be moved along the channel.

Next, a process in which the length of the line light source is adjusted and emitted in the laser display device according to the exemplary embodiment of the present invention will be described.

When the user operates the power switch provided on the side surfaces of the

housings

10 and 20 to ON, the laser light source unit 32 emits light from a point light source and a refractive lens 41 ′ installed on the front surface of the laser light source unit 32. ), it is converted into a line light source.

The light of the line light source has a relatively short length in the process of being emitted through the exit port 10'. At this time, the user only operates the power switch to ON and does not operate the operation switch 11. The driven switching plate 43c of the driven switching portion 43 is located at the front end of the lower guide 23c at a position close to the exit port 10'.

As shown in Fig. 5, the pair of driven switching plates 43c are located as close to each other as possible. The line light source is filtered by the passive switching plate 43c and the exit port 10' to emit only light that goes straight, and a relatively short line light source is emitted corresponding to the shape of the exit port 10'.

When the user manipulates the operation switch 11 to move along the switch seating groove 12 formed in the upper housing 10, the connection shaft 13 connected to the operation switch 11 becomes the guide hole 12' Move along. The other side of the connection shaft 13 is fixed to the shaft groove 42 ′ of the movable switch 42, so that the movable switch 42 is also linked to the movement of the operation switch 11. ) Moves in the same direction as the moving direction. That is, the movable switching unit 42 is moved toward the exit port 10'.

When the movable switching part 42 is moved toward the exit port 10', the movable switching arm 42a passes between the pair of pinions 41c, and the pair of pinions 41c is switched to the movable switch. It rotates in engagement with the rack 42b. When the pair of pinions 41c are rotated, the driven switching rack 43b engaged from the outside with the pinion 41c moves according to the rotation of the pinion 41c, and the driven switching portion 43 is switched to the operation. It moves in the direction opposite to the moving direction of the part 42. That is, the pair of pinions 41c only change the direction of the force of the movable switching unit 42 and transmit the force to the driven switching unit 43. When the movable switching unit 42 moves forward, the driven switching unit 43 retreats, and when the movable switching unit 42 is retracted, the driven switching unit 43 moves forward.

When the driven switching part 43 is away from the exit port 10', the driven switching plate 43c located at the tip of the guide rail 23 close to the exit port 10' It is away from the exit port 10' along the rail 23. Since the pair of guide rails 23 are formed such that the distance between the guide rails 23 increases as the distance from the exit hole 10' increases, the driven switching plate 43c is also the exit hole 10'. ), the distance between the pair of driven switching plates 43c increases.

As the hook between the pair of driven conversion plates 43c increases, the distance through which the line light source passing through the refractive lens 41 ′ can pass increases, so that the line light emitted through the exit port 10 ′ increases. The length of the circle also becomes relatively long.

As shown in Fig. 6(a), when the pair of driven switching plates 43c are placed at the tip of the guide rail 23 far from the exit port 10', the line light source is shown in Fig. 6(b) A line light source having a relatively long length is reflected by the driven switching plate 43c along the direction of the arrow shown in FIG.

In the above, even if all the constituent elements constituting the embodiment according to the present invention are described as being combined into one or operating in combination, the present invention is not necessarily limited to this embodiment. That is, within the scope of the object of the present invention, all the constituent elements may be selectively combined and operated in one or more. In addition, terms such as "include", "consist of" or "have" described above mean that the corresponding component may be present unless otherwise stated, excluding other components. It should not be construed as being able to further include other components. All terms, including technical or scientific terms, have the same meaning as commonly understood by one of ordinary skill in the art, unless otherwise defined. Terms generally used, such as terms defined in the dictionary, should be interpreted as being consistent with the meaning of the context of the related technology, and are not interpreted as ideal or excessively formal meanings unless explicitly defined in the present invention.

The above description is merely illustrative of the technical idea of the present invention, and those of ordinary skill in the art to which the present invention pertains will be able to make various modifications and variations without departing from the essential characteristics of the present invention. Accordingly, the embodiments disclosed in the present invention are not intended to limit the technical idea of the present invention, but to explain the technical idea, and the scope of the technical idea of the present invention is not limited by these embodiments. The scope of protection of the present invention should be interpreted by the claims below, and all technical ideas within the scope equivalent thereto should be construed as being included in the scope of the present invention.

In this embodiment, the distance between the pair of lower guides 23c formed on the lower housing 20 is formed in a shape that increases toward the exit port 10', but is not limited thereto. The distance between the pair of lower guides 23c may become narrower toward the sphere 10'. Of course, the distance between the pair of lower guides 23c may be continuously increased or decreased, and may be gradually increased or decreased.

Claims

A housing with an exit hole formed on the front and an operation switch on the outer surface,

A laser light source unit installed inside the housing to irradiate laser light,

A battery installed on the rear surface of the laser light source to supply power to the laser light source;

A refractive lens that refracts the laser light into a line light source at the front surface of the laser light source unit,

A laser display device comprising an optical conversion module interlocking with the movement of the operation switch to adjust the length of the line light source.
The method of claim 1, wherein the optical conversion module

A movable switching unit that is interlocked with the operation switch and performs linear reciprocating motion,

A driven switching unit for adjusting the length of the line light source emitted through the exit while linearly moving in a direction opposite to the movement direction of the movable switching unit,

A laser display device comprising a support portion between the movable switching unit and the driven switching unit and configured to change directions so that the movable switching unit and the driven switching unit move in different directions.
The method of claim 2, wherein the movable switching unit is elongated in one direction and includes a movable switching arm having movable switching racks formed on both outer surfaces of the movable switching unit, and a shaft groove extending from one side of the movable switching unit and into which a connecting shaft provided in the operation switch is inserted Including the formed switch fixing portion,

The driven switching unit includes a pair of driven switching arms having a driven switching rack formed on a surface facing each other, and a driven switching plate extending from one side of the driven switching arm and elastically deformed,

The support is installed on the upper end of the laser light source, the support for supporting the movable switching unit and the driven switching unit, the laser display device comprising a pinion is installed rotatably between the movable switching rack and the driven switching rack.
The method of claim 3, wherein a pair of guide rails are formed symmetrically toward the exit port on the inner surface of the housing,

The driven switching plate is coupled to the lower rail so as to be movable, and when the movable switching portion moves in one direction, the driven switching plate is interlocked therewith to move the driven switching plate along the guide rail.
The laser display device of claim 4, wherein the pair of guide rails is formed such that a distance between the pair of guide rails becomes narrower or further away toward the exit port.
The method of claim 5, wherein the guide rail is formed in parallel with the inner guide and the outer guide separated by a predetermined distance,

A laser display device capable of reciprocating movement by mounting the driven switching plate between the inner guide and the outer guide.
The laser display device according to any one of claims 1 to 6, further comprising a circuit board in which a charging terminal for supplying power to the battery is formed inside the housing.
The laser display device of claim 7, wherein a cantilever-shaped coupling arm protrudes from the circuit board toward the exit hole, and the optical conversion module is installed on the coupling arm.