Patent Description:
Conventionally, there are proposed various techniques related to the laser processing device mentioned above. For example, the technique disclosed in the following patent literature <NUM> is of a laser optical apparatus where a laser beam source unit is provided on an entire gantry, and a casing encloses a laser beam source of the laser beam source unit. One end of each of an air intake duct and an air exhaust duct made of a flexible material is connected to the casing. The air intake duct is flexed appropriately with its other end being opened in a cover member while the other end of the air exhaust duct is connected to an air exhaust fan provided in the cover member. By virtue of this, an air flow for preventing the laser beam source from temperature increase is secured. Citation List.

PATENT LITERATURE <NUM>: <CIT>. Known art includes: <CIT> (describing the preamble of claim <NUM>), describes a device for the laser marking of products, <CIT>(which describes an electronic money mining system) and <CIT> (which describes a laser resonator, laser processing apparatus and a dehumidification method of a laser resonator).

However, in the technique disclosed in the above patent literature <NUM>, no consideration is made for a control member which controls the laser beam source unit, although the control member generates heat. Even though the control member is cooled by the air flow for preventing the laser beam source from temperature increase, this is no more than a secondary cooling such that the control member cannot be cooled sufficiently. Therefore, the temperature inside the casing increases due to the influence of the heat emitted from the control member, such that the laser beam source unit is liable to insufficient cooling.

Accordingly, the present invention is made in view of the above situation, and an object thereof is to provide a laser processing device facilitating improvement of the cooling efficiency for the laser emission unit and the control member.

A laser processing device according to the present invention is defined in claim <NUM>.

Further preferred embodiments of the present invention are defined in the dependant claims.

According to the present invention, the laser processing device is capable of facilitating improvement of the cooling efficiency for the laser emission unit and the control member.

Hereinbelow, an explanation will be made on a laser marker of the present disclosure, based on an embodiment having made the same in a concrete manner, referring to the accompanied drawings. In the drawings used for the following explanation, part of the basic configuration may be omitted in illustration, and the ratio in size and the like may not be necessarily correct for each illustrated part. In the respective drawings, a front/rear direction D1, an up/down direction D2 and a left/right direction D3 are presented as indicated in each drawing.

As shown in <FIG> and <FIG>, a laser marker <NUM> of this embodiment is dust-proof and water-proof, including a first body <NUM>, a second body <NUM>, and a third body <NUM>. From the third body <NUM>, laser beam R is emitted for marking (printing) processing. The laser beam R is oscillated and emitted from a laser emission unit <NUM> provided inside the first body <NUM>, reflected from a reflecting mirror <NUM> provided inside the second body <NUM>, and finally scanned and collected by a galvanic scanner <NUM> and an fθ lens <NUM> provided inside the third body <NUM> (see <FIG> and <FIG>).

Inside the first body <NUM>, air cooling is performed by way of taking in compressed air from an air intake port <NUM>, and discharging the air from an exhaust port <NUM> or a silencer <NUM>. Note that the air intake port <NUM> is connected with an unshown air compressor provided separate from the laser marker <NUM>, via a pipe. The compressed air supplied from the air compressor is taken into the first body <NUM> from the air intake port <NUM>. The air intake port <NUM> and the exhaust port <NUM> are pipe joints of one-touch type. The first body <NUM> is shaped into an approximate cuboid elongate in the front/rear direction D1, including a base member <NUM> and an outer cover <NUM>. The base member <NUM> and the outer cover <NUM> are fixed with screws <NUM>.

In the laser marker <NUM> of this embodiment, although many of its components (for example, the outer cover <NUM> and the like) are fixed with the screws in a removable manner, detailed explanation is omitted. Note that the screws for fixation are in a plurality of types.

Hereinbelow, referring to the drawings and the like showing the first body <NUM> where the outer cover <NUM> is removed, the first body <NUM> will be explained. As shown in <FIG>, the base member <NUM> includes a base plate 23A, a back plate 23B, and a front plate 23C. The back plate 23B is provided to stand up from the rear end of the base plate 23A. The back plate 23B is provided with the air intake port <NUM>, the exhaust port <NUM>, the silencer <NUM>, and the like. The front plate 23C is provided to stand up from the front end of the base plate 23A. The front plate 23C is provided with the second body <NUM> (and the third body <NUM>).

On the base plate 23A, the laser emission unit <NUM> is arranged along the front/rear direction D1 and, on the left side of the laser emission unit <NUM>, a galvanic substrate <NUM>, a main substrate <NUM>, a power unit <NUM> and the like are arranged. The galvanic substrate <NUM> is a substrate for controlling the galvanic scanner <NUM>. The main substrate <NUM> is a substrate for controlling the laser marker <NUM> and is fixed on the base plate 23A via a metallic bracket <NUM>. The bracket <NUM> is bent into an approximate L shape as viewed from the front/rear direction D1, and fixed with the main substrate <NUM> on the left surface at the other side than the laser emission unit <NUM>. The power unit <NUM> is provided to supply electric power to the laser marker <NUM>.

The laser emission unit <NUM> is covered by an inner cover <NUM>. The inner cover <NUM> is shaped into an approximate cuboid elongate in the front/rear direction D1, and its lower side, front side and rear side are all open. When the inner cover <NUM> is fixed on the base plate 23A along the front/rear direction D1, then a space is formed in the inner cover <NUM> to accommodate the laser emission unit <NUM> therein and let the front side and the rear side be open.

Inside the first body <NUM>, a left surface 35A of the inner cover <NUM> partitions the space into a first space S1 and a second space S2. That is, inside the first body <NUM>, the first space S1 is the right part from the left surface 35A of the inner cover <NUM> whereas the second space S2 is the left part from the left surface 35A of the inner cover <NUM>. The laser emission unit <NUM> and the like are arranged in the first space S1. The galvanic substrate <NUM>, the main substrate <NUM> (and the bracket <NUM>), the power unit <NUM>, and the like are arranged in the second space S2. By virtue of this, between the laser emission unit <NUM> and the main substrate <NUM> (and the bracket <NUM>), the left surface 35A of the inner cover <NUM> is interposed.

The second space S2 is in communication with the first space S1 at both sides in the front/rear direction D1 in which the left surface 35A of the inner cover <NUM> extends. The back plate 23B, where the exhaust port <NUM> and the silencer <NUM> are provided, is arranged at the rear side among the two sides in the front/rear direction D1 where the first space S1 and the second space S2 are in communication. On the other hand, the front plate 23C is arranged at the front side among the two sides in the front/rear direction D1 where the first space S1 and the second space S2 are in communication.

A pipe <NUM> shown in <FIG> is provided in the first body <NUM>. The pipe <NUM> is adapted to schematically show a system where the compressed air flows. The compressed air is taken into the first body <NUM> from the air intake port <NUM>. The system of the pipe <NUM> will be explained below. Note that a specific configuration of the pipe <NUM> will be described later. The pipe <NUM> is configured for the compressed air to flow therethrough and constructed from a main pipe <NUM>, a first branch pipe <NUM>, a second branch pipe <NUM>, and a third branch pipe <NUM>. One end of the main pipe <NUM> is connected to the air intake port <NUM>. The other end of the main pipe <NUM> serves as a first branch point <NUM>. The internal diameter of the main pipe <NUM> is, for example, <NUM>. The main pipe <NUM> is branched into the first branch pipe <NUM> and the second branch pipe <NUM> at the first branch point <NUM>.

The internal diameter of the first branch pipe <NUM> is, for example, <NUM>. A second branch point <NUM> is provided midway in the second branch pipe <NUM>. The second branch pipe <NUM> is branched into the third branch pipe <NUM> and another part of the second branch pipe <NUM> at the second branch point <NUM>. The second branch pipe <NUM> has such an internal diameter of <NUM>, for example, as from the first branch point <NUM> to the second branch point <NUM>, and such an internal diameter of <NUM>, for example, as from the second branch point <NUM> to a leading end 43A. The internal diameter of the third branch pipe <NUM> is, for example, <NUM>. A leading end 41A of the first branch pipe <NUM>, the leading end 43A of the second branch pipe <NUM>, and a leading end 45A of the third branch pipe <NUM> are open from which the compressed air taken from the air intake port <NUM> is jetted.

A specific explanation will be made for such system of the pipe <NUM>. As shown in <FIG>, to the air intake port <NUM>, a conduit tube <NUM>, an electromagnetic valve <NUM>, a conduit tube <NUM>, and a first branch joint <NUM> are connected in the same order as written herein. The electromagnetic valve <NUM> is a so-called on/off valve. The first branch joint <NUM> is a pipe joint of one-touch type branched in three directions. The pipe part from the air intake port <NUM> to the first branch joint <NUM> (the respective conduit tubes <NUM> and <NUM>) correspond to the main pipe <NUM>. That is, the electromagnetic valve <NUM> is provided midway in the main pipe <NUM>, and the first branch joint <NUM> is provided at the first branch point <NUM>. The compressed air in the main pipe <NUM> is controlled by the electromagnetic valve <NUM> for flowing and stop of the flowing.

A conduit tube <NUM> and a left nozzle <NUM> are connected to the first branch joint <NUM> in the same order as written herein. The conduit tube <NUM> corresponds to the first branch pipe <NUM>. That is, the leading end 41A of the first branch pipe <NUM> is provided with the left nozzle <NUM>.

Further, a conduit tube <NUM>, a second branch joint <NUM>, and a conduit tube <NUM> are connected to the first branch joint <NUM> in the same order as written herein. The second branch joint <NUM> is a pipe joint of one-touch type branched in three directions. Each of the conduit tubes <NUM> and <NUM> corresponds to the second branch pipe <NUM>. That is, the second branch point <NUM> is provided with the second branch joint <NUM>.

A conduit tube <NUM> and a right nozzle <NUM> are connected to the second branch joint <NUM> in the same order as written herein. The conduit tube <NUM> corresponds to the third branch pipe <NUM>. That is, the leading end 45A of the third branch pipe <NUM> is provided with the right nozzle <NUM>.

Henceforth, the respective conduit tubes <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, and <NUM> correspond to the pipe <NUM>.

The left nozzle <NUM> and the right nozzle <NUM> are positioned at the rear side of the laser emission unit <NUM> in the first space S1, being directed to the laser emission unit <NUM>. The laser emission unit <NUM> is shaped into an approximate cuboid elongate in the front/rear direction D1. Among the six surfaces of the laser emission unit <NUM>, the left surface and the right surface are provided with a left heat sink <NUM> and a right heat sink <NUM>, respectively. The heat sinks <NUM> and <NUM> each have a plurality of plate-like fins arranged along the front/rear direction D1. Each of the heat sinks <NUM> and <NUM> is arranged between the inner cover <NUM> and the laser emission unit <NUM>. The left nozzle <NUM> is directed to the left heat sink <NUM> while the right nozzle <NUM> is directed to the right heat sink <NUM>.

The conduit tube <NUM> is arranged to pass above the power unit <NUM> in the second space S2 at the left side of the left surface 35A of the inner cover <NUM>. Further, as shown in <FIG>, the conduit tube <NUM> passes through as far as between the left surface 35A of the inner cover <NUM> and the bracket <NUM>. The pipe joint <NUM> of one-touch type is connected to the leading end of the conduit tube <NUM>. That is, the pipe joint <NUM> is connected to the leading end 43A of the second branch pipe <NUM>.

The pipe joint <NUM> is fixed on a projecting piece <NUM> projecting from the bracket <NUM> to the right side due to the bracket <NUM> being partially cut in up, in a state of being directed a little more to the left side than at the rear side (that is, to the side of the bracket <NUM>). Between the bracket <NUM> and the main substrate <NUM>, two thermal conducting sheets <NUM>, <NUM> are interposed. The thermal conducting sheets <NUM>, <NUM> are each in tight contact with the bracket <NUM> and in tight contact with heat emitting elements comparatively weak in heat-resisting property among the electric parts mounted on the main substrate <NUM>. By virtue of this, the main substrate <NUM> transmits its heat to the metallic bracket <NUM> via the respective thermal conducting sheets <NUM>, <NUM>. The pipe j oint <NUM> is fixed on the projecting piece <NUM> of the bracket <NUM>, as described above, and is directed to the respective thermal conducting sheets <NUM>, <NUM> via the bracket <NUM>, from the right side of the bracket <NUM> by way of being directed a little more to the left side than to the rear side (that is, to the side of the bracket <NUM>).

Inside the first body <NUM>, the compressed air taken in from the air intake port <NUM> is jetted out from the left nozzle <NUM>, the right nozzle <NUM>, and the pipe joint <NUM>. The compressed air having jetted from the left nozzle <NUM> and the pipe joint <NUM> flows frontward in the first space S1 between the inner cover <NUM> and the laser emission unit <NUM> to hit the front plate 23C and then flow rearward in the second space S2 after taking away the heat of the laser emission unit <NUM> from the respective heat sinks <NUM> and <NUM>.

The compressed air having jetted from the pipe joint <NUM> hits the bracket <NUM> in the second space S2 so as to flow rearward in the second space S2 after taking away the heat of the main substrate <NUM>.

In this manner, the air having taken away the heat from the laser emission unit <NUM> or the main substrate <NUM> flows rearward in the second space S2, and is then discharged out of the first body <NUM> from the exhaust port <NUM> or the silencer <NUM> provided on the back plate 23B.

As shown in <FIG>, <FIG> and <FIG>, the silencer <NUM> includes a silencer body <NUM>, a first cover member <NUM>, and a second cover member <NUM>. The first cover member <NUM> is bent into a C-shape in a planar view, and its front side, upper side, and lower side are open. The first cover member <NUM> is fixed on the back plate 23B to enclose the silencer body <NUM> which passes through from the front side of the first cover member <NUM>. The second cover member <NUM> is shaped into an approximate cuboid, each of right surface and left surface thereof is formed with a slit <NUM>, and its front side is open. The silencer body <NUM> and the first cover member <NUM> are set into the second cover member <NUM> from the front side, and the second cover member <NUM> is fixed on the back plate 23B to enclose the silencer body <NUM> and the first cover member <NUM>.

By virtue of this, the silencer <NUM> prevents liquids such as water and the like from flowing into the first body <NUM> from the silencer body <NUM>. The air discharged from the silencer body <NUM> passes above or below the first cover member <NUM> and through the slit <NUM> of the second cover member <NUM> to be discharged out of the first body <NUM>.

As explained above in detail, in the laser marker <NUM> of this embodiment, the left nozzle <NUM> of the conduit tube <NUM> for jetting the compressed air (the leading end 41A of the first branch pipe <NUM>) is arranged to face the laser emission unit <NUM> while the pipe joint <NUM> of the conduit tube <NUM> for jetting the compressed air (the leading end 43A of the second branch pipe <NUM>) is arranged to face the bracket <NUM> fixing the main substrate <NUM>. Therefore, in the laser marker <NUM> of this embodiment, with the wind of the compressed air directly hitting the laser emission unit <NUM> and the bracket <NUM> (the main substrate <NUM>), exhausting heat is performed by way of forced convection such that improvement of the cooling efficiency is facilitated for the laser emission unit <NUM> and the bracket <NUM> (the main substrate <NUM>). Note that much the same is true on the right nozzle <NUM> of the conduit tube <NUM> for jetting the compressed air (the leading end 45A of the third branch pipe <NUM>). Further, in the laser marker <NUM> of this embodiment, because the bracket <NUM> (the main substrate <NUM>) is cooled with the wind of the compressed air directly hit thereupon, it is possible to sufficiently cool the laser emission unit <NUM> without being affected by the heat emitted at the main substrate <NUM>.

Further, in the laser marker <NUM> of this embodiment, due to the left surface 35A of the inner cover <NUM> interposed between the laser emission unit <NUM> and the bracket <NUM> (the main substrate <NUM>), thermal barrier is applied between the laser emission unit <NUM> and the bracket <NUM> (the main substrate <NUM>). Therefore, improvement of the cooling efficiency is further facilitated for the laser emission unit <NUM> and the bracket <NUM> (the main substrate <NUM>).

Further, in the laser marker <NUM> of this embodiment, the first space S1 where the laser emission unit <NUM> is arranged is in communication with the second space S2 where the bracket <NUM> (the main substrate <NUM>) is arranged, on both sides in the front/rear direction D1 along which the left surface 35A of the inner cover <NUM> extends. Further, in the first space S1, at the rear side of the laser emission unit <NUM> in the front/rear direction D1, the left nozzle <NUM> of the conduit tube <NUM> (the leading end 41A of the first branch pipe <NUM>) is arranged. Further, the exhaust port <NUM> and the silencer <NUM> are provided on the back plate 23B of the first body <NUM> positioned at the rear side in the front/rear direction D1.

Therefore, the compressed air having jetted from the left nozzle <NUM> of the conduit tube <NUM> (the leading end 41A of the first branch pipe <NUM>) flows frontward from the rear part in the first space S1 in the front/rear direction D1 and, further, flows rearward from the front part in the second space S2 in the front/rear direction D1 to be discharged out of the first body <NUM> from the exhaust port <NUM> or the silencer <NUM>. In this manner, in the laser marker <NUM> of this embodiment, the air flowing circularly inside the first body <NUM> is discharged out of the first body <NUM> such that exhausting heat is performed efficiently by the forced convection. Note that much the same is true on the right nozzle <NUM> of the conduit tube <NUM> (the leading end 45A of the third branch pipe <NUM>) for jetting the compressed air.

Further, in the laser marker <NUM> of this embodiment, in the second space S2, the pipe joint <NUM> of the conduit tube <NUM> (the leading end 43A of the second branch pipe <NUM>) is directed a little more to the left side than to the rear side (that is, to the side of the bracket <NUM>) in the front/rear direction. Therefore, in the second space S2, because the compressed air having jetted from the pipe joint <NUM> of the conduit tube <NUM> (the leading end 43A of the second branch pipe <NUM>) flows rearward from the front side in the front/rear direction D1, the compressed air having jetted from the left nozzle <NUM> of the conduit tube <NUM> (the leading end 41A of the first branch pipe <NUM>) flows in the same direction. By virtue of this, with the laser marker <NUM> of this embodiment, it is possible to stabilize the air flow inside the first body <NUM>. Nate that much the same is true on the right nozzle <NUM> of the conduit tube <NUM> (the leading end 45A of the third branch pipe <NUM>) for jetting the compressed air.

Further, in the laser marker <NUM> of this embodiment, the left nozzle <NUM> of the conduit tube <NUM> (the leading end 41A of the first branch pipe <NUM>) is directed to the left heat sink <NUM> of the laser emission unit <NUM> whereas the right nozzle <NUM> of the conduit tube <NUM> (the leading end 45A of the third branch pipe <NUM>) is directed to the right heat sink <NUM> of the laser emission unit <NUM>. Therefore, in the laser marker <NUM> of this embodiment, the compressed air having jetted from the left nozzle <NUM> of the conduit tube <NUM> (the leading end 41A of the first branch pipe <NUM>) flows toward the left heat sink <NUM> of the laser emission unit <NUM> whereas the compressed air having jetted from the right nozzle <NUM> of the conduit tube <NUM> (the leading end 45A of the third branch pipe <NUM>) flows toward the right heat sink <NUM> of the laser emission unit <NUM>, such that heat dissipation is performed efficiently for the laser emission unit <NUM>.

Further, in the laser marker <NUM> of this embodiment, the thermal conducting sheets <NUM>, <NUM> are each interposed between the main substrate <NUM> and the bracket <NUM>. Further, the pipe joint <NUM> of the conduit tube <NUM> (the leading end 43A of the second branch pipe <NUM>) is directed to the respective thermal conducting sheets <NUM>, <NUM> via the bracket <NUM>, from the right side of the bracket <NUM>. Therefore, if the compressed air has jetted from the pipe joint <NUM> of the conduit tube <NUM> (the leading end 43A of the second branch pipe <NUM>), then the compressed air hits the bracket <NUM> such that it is possible for the compressed air to take away the heat transmitted from the main substrate <NUM> to the bracket <NUM> via the respective thermal conducting sheets <NUM>, <NUM>. Further, even if the compressed air has not jetted from the pipe joint <NUM> of the conduit tube <NUM> (the leading end 43A of the second branch pipe <NUM>), because the heat is transmitted from the main substrate <NUM> to the bracket <NUM> via the respective thermal conducting sheets <NUM>, <NUM>, heat dissipation of the main substrate <NUM> is still maintained.

Further, in the laser marker <NUM> of this embodiment, the conduit tube <NUM> (the third branch pipe <NUM>) has a larger internal diameter (for example, <NUM>) than the conduit tube <NUM> (for example, <NUM>; that is, the part of the second branch pipe <NUM> from the leading end 43A of the second branch pipe <NUM> to the second branch point <NUM>). In other words, the conduit tube <NUM> has a smaller internal diameter (for example, <NUM>; that is, one part of the second branch pipe <NUM> including the leading end 43A of the second branch pipe <NUM>) than the conduit tube <NUM> (the first branch pipe <NUM>; for example, <NUM>).

In this manner, in the laser marker <NUM> of this embodiment, by applying a difference in internal diameter to the respective conduit tubes <NUM>, <NUM> and <NUM>, the amount of the compressed air, which is jetted from each of the left nozzle <NUM> of the conduit tube <NUM> (the leading end 41A of the first branch pipe <NUM>), the pipe joint <NUM> of the conduit tube <NUM> (the leading end 43A of the second branch pipe <NUM>), and the right nozzle <NUM> of the conduit tube <NUM> (the leading end 45A of the third branch pipe <NUM>), is adjusted according to the heat emitting amount of the laser emission unit <NUM> and the heat emitting amount of the main substrate <NUM>.

In this embodiment, meanwhile, the laser marker <NUM> is an example of the "laser processing device". The left surface and the right surface of the laser emission unit <NUM> are examples of the "at least two lateral surfaces of the plurality of lateral surfaces constructing the laser emission unit". The exhaust port <NUM> and the silencer <NUM> are examples of the "vent". The first body <NUM> is an example of the "casing". The back plate 23B is an example of the "lateral surface positioned at the other side in the partitioning direction among the plurality of lateral surfaces constructing the casing". The main substrate <NUM> and the bracket <NUM> are examples of the "control member". The bracket <NUM> is an example of the "fixing member". The left surface 35A of the inner cover <NUM> is an example of the "wall". The second branch point <NUM> is an example of the "branched position of the third branch pipe". The left heat sink <NUM> and the right heat sink <NUM> are examples of the "plurality of heat sinks". The left heat sink <NUM> is an example of the "one heat sink". The right heat sink <NUM> is an example of the "other heat sink". Each of the thermal conducting sheets <NUM>, <NUM> is an example of the "thermal conductive member". The front/rear direction D1 is an example of the "partitioning direction".

Note that the present invention is not limited to this embodiment but can be changed in various manners, with the scope of the invention being defined by the appended claims. For example, even if the right nozzle <NUM> of the conduit tube <NUM> (the leading end 45A of the third branch pipe <NUM>) is omitted, improvement of the cooling efficiency is still facilitated for the laser emission unit <NUM> and the bracket <NUM> (the main substrate <NUM>).

Further, the respective heat sinks <NUM> and <NUM> of the laser emission unit <NUM> may each have a fin in a shape of needle-point holder or a bellows-like fin, for example, instead of the plurality of plate-like fins. Further, in the laser emission unit <NUM>, instead of the left heat sink <NUM> or the right heat sink <NUM>, an upper heat sink may be provided on the upper surface of the laser emission unit <NUM>. In such a case, the left nozzle <NUM> of the conduit tube <NUM> (the leading end 41A of the first branch pipe <NUM>) or the right nozzle <NUM> of the conduit tube <NUM> (the leading end 45A of the third branch pipe <NUM>) is directed to the upper sink.

Further, if the exhaust port <NUM> and the silencer <NUM> are arranged on the back plate 23B at the side of the second space S2, that is, on the left part of the back plate 23B, then the first space S1 and the second space S2 may be in communication only on the front side in the front/rear direction D1 in which the left surface 35A of the inner cover <NUM> extends.

Further, instead of the compressed air, a compressed gas such as nitrogen, helium or the like, for example, may be taken into the air intake port <NUM>.

Claim 1:
A laser processing device (<NUM>) comprising:
a laser emission unit (<NUM>) configured to emit laser beam;
a control member (<NUM>, <NUM>) configured to control the laser emission unit (<NUM>);
a casing (<NUM>) in which the laser emission unit (<NUM>) and the control member (<NUM>, <NUM>) are accommodated;
the laser processing device being characterised by:
a pipe (<NUM>) through which, in use, compressed gas supplied from outside of the casing (<NUM>) flows in a branched manner, the pipe (<NUM>) being provided in the casing (<NUM>),
wherein the pipe (<NUM>) includes a first branch pipe (<NUM>) arranged with a leading end (41A) for jetting the compressed gas facing the laser emission unit (<NUM>), and a second branch pipe (<NUM>) arranged with a leading end (43A) for jetting the compressed gas facing the control member (<NUM>, <NUM>);
a wall (35A) provided between the laser emission unit (<NUM>) and the control member (<NUM>, <NUM>);
a first space (S1) which is a space formed by partitioning inside the casing (<NUM>) by the wall (35A) and in which the laser emission unit (<NUM>) is arranged; and
a second space (S2) which is a space formed by partitioning inside the casing (<NUM>) by the wall (35A), in which the control member (<NUM>, <NUM>) is arranged, and which is in communication with the first space (S1) at least on one side in a partitioning direction along which the wall (35A) extends,
wherein the leading end (41A) of the first branch pipe (<NUM>) is arranged on the other side in the partitioning direction with respect to the laser emission unit (<NUM>) in the first space (S1), and
a vent (<NUM>, <NUM>) for discharging the gas inside the casing (<NUM>) to the outside of the casing (<NUM>) is provided in a lateral surface, which is included in a plurality of lateral surfaces constructing the casing (<NUM>) and which is positioned on the other side in the partitioning direction.