CN217635394U - Car lamp device and car lamp system - Google Patents

Abstract

A vehicle lamp device and a vehicle lamp system. The car light device comprises a light-emitting lens and two optical units. The light-emitting lens comprises a front light-emitting surface, a Fresnel light-emitting surface and a front light-entering surface, wherein the Fresnel light-emitting surface is positioned at the rear of the front light-emitting surface at intervals and defines a focus unit, and the front light-entering surface is positioned between the front light-emitting surface and the Fresnel light-emitting surface at intervals. Each optical unit comprises a light source and a light incident lens which are arranged up and down. The light incidence lens comprises an end face facing the light source, an inclined reflecting face, an incident face and two parabolic reflecting faces, wherein the inclined reflecting face extends obliquely forwards at an interval from top to bottom, the end face faces the inclined reflecting face, the incident face is concave, and the two parabolic reflecting faces are located on the front side and the rear side of the incident face respectively. The light rays which are incident through the light incident surface and are reflected by the inclined reflecting surface and advance towards the Fresnel light emergent surface, and the extension lines meet the focus unit. The utility model provides a different selection with current product.

Description

Car lamp device and car lamp system

Technical Field

The utility model relates to a subassembly of vehicle especially relates to a car light device and car light system.

Background

Referring to fig. 1 to 3, a conventional side-entry vehicle lamp device is suitable for being used as a head lamp of a vehicle for providing distance/near light illumination, and includes a light exit lens 11 located in front, a plurality of light entry lenses 12 integrally connected to the rear of the light exit lens 11, and a plurality of light sources 13 respectively corresponding to the light entry lenses 12.

Referring to fig. 2 to 4, the light-exiting lens 11 includes a light-exiting surface 111 facing forward and being convex from back to front. The light exit surface 111 defines a light exit focus 112.

The light incident lens 12 is divided into an upper row and a lower row. The light incident lenses 12 in each row are arranged left and right. Each of the light incident lenses 12 has a reflecting surface 121 extending obliquely.

The light sources 13 are respectively located at the upper and lower sides of the light incident lens 12, and can provide light projected to the light incident lens 12 in the upper and lower directions. After the light provided by the light source 13 enters the light incident lens 12, the light is reflected forward by the reflection surface 121 of the light incident lens 12 and then emitted from the light emitting surface 111.

Referring to fig. 3 to 4, the light rays reflected by the respective one of the reflecting surfaces 121 have extended lines which intersect at the focal point 142 of one of the two curves 141 of the hyperbola 14, and the focal point 144 of the other curve 143 of the hyperbola 14 overlaps the light exit focal point 112.

The conventional side-entry car light device utilizes hyperbolic optical characteristics and real-virtual focus transformation, so that the light source 13 can be arranged on the upper and lower opposite sides of the light-entering lens 12 instead of being arranged behind the light-entering lens 12, and therefore the length of the car light device in the front-back direction can be shortened.

Disclosure of Invention

The utility model aims to provide a: a vehicle lamp device and a vehicle lamp system capable of improving at least one of the disadvantages of the prior art are provided.

The utility model discloses car light device is applicable to past projection to contain light-emitting lens, and at least one optical unit, light-emitting lens is including being located the front end and facing the place ahead and being applicable to the preceding play plain noodles that supply the light to jet out forward, at least one optical unit is including the light source of arranging from top to bottom and go into optical lens, the light source can provide on the upper and lower direction past go into the light that optical lens throwed, go into optical lens including the orientation the terminal surface of light source, its characterized in that: the light-emitting lens is still located including the interval before the interval the surface rear of the play plain noodles and the fresnel play plain noodles that face the place ahead to and the interval is located before go out the plain noodles with the fresnel go out between the plain noodles and the preceding income plain noodles that face the place behind, fresnel goes out the plain noodles and defines out the focus unit, go in the plain lens still include with interval and down the terminal surface and down the interval and toward the preceding oblique plane of reflection that incline to extend, by in the upper and lower direction the terminal surface toward the concave income plain noodles of oblique plane of reflection, and two by the terminal surface is past the oblique plane of reflection extends and is located respectively the parabolic plane of reflection of going in both sides around the income plain noodles, the warp income plain noodles is incided and is passed through the oblique plane of reflection and toward the light that fresnel goes out the plain noodles and march, the extension line meet in the focus unit.

Car lamp device, go into the plain noodles around defining out the opening orientation the income plain noodles space of light source, go into the plain noodles including be opposite to the opening and towards open-ended main face portion, and by the terminal surface is past main face portion extends and connects main face portion's ring face portion, main face portion court the light source is protruding to be stretched, and defines and is located the protruding focus of passing through of light source, and with ring face portion cooperatees and defines go into the plain noodles space, extend around the definition and pass through the axis of rotation of open-ended center of symmetry, and pass through the sectioning face of axis, sectioning face and each parabolic plane definition goes out first section line, sectioning face with two second section lines are defined out to the ring face portion, sectioning face with main face portion defines out the third section line, each first section line is for defining the extension line object line of parabola focus, light through respective after the refraction of second section line, the intersection forms the virtual focus of overlapping respective first section line parabola focus.

The car lamp device, parabolic reflecting surface respectively by first cut line with the rotation axis forms for 180 degrees delimitations of axle rotation, the ring face portion by the second cut line with the rotation axis forms for 180 degrees delimitations of axle rotation, the main face portion by the third cut line with the rotation axis forms for 180 degrees delimitations of axle rotation.

Car light device, the light that the light source provided, warp main facial refraction, or warp via behind the refraction of ring surface portion via parabolic plane of reflection reflects, in the oblique reflection shape of face forms trapezoidal light shape.

Car light device, the light-emitting focus of a plurality of upper and lower arrangements is defined out to the fresnel play plain noodles, the light-emitting focus constitutes the focus unit forms the light of trapezoidal light shape, warp the skew surface reflection, extension line intersection form a plurality of upper and lower arrangements and overlap respectively the rendezvous focus of light-emitting focus.

Car light device, the light-emitting focus of a plurality of upper and lower arrangements is defined out to the fresnel play plain noodles, the light-emitting focus constitutes focus unit, warp the light of oblique reflection surface reflection, extension line meet form a plurality of range from top to bottom and overlap respectively the meeting focus of light-emitting focus.

Car light device, a plurality of light-emitting focuses of arranging from top to bottom are defined out to the fresnel play plain noodles, the light-emitting focus constitutes the focus unit, go into optical lens still include two respectively by the side plane of reflection of the left and right sides of oblique reflection plane forward extension, each side plane of reflection is defined out the side with the horizontal plane and is thrown the object line, the focus is thrown to the side of each side throwing the object line and overlaps respective light-emitting focus.

Car light device, the inclined reflection face is 45 degrees for the perpendicular slope.

The car light device, contain two the optical unit, the optical unit the photochromic that the light source provided is different each other to can be controlled and give out light according to different chronogenesis.

The utility model discloses car light system contains a plurality of car light devices as before, each the car light device includes two and arranges from top to bottom the optical unit, the optical unit the photochromic not identical each other that the light source provided, just the optical unit the light source can be controlled and give off light simultaneously to can be controlled and give off light according to different chronogenesis.

The utility model has the advantages that: a vehicle lamp device/vehicle lamp system having a design different from the conventional design is provided, which is suitable for use as a single driving lamp/daytime lamp/direction lamp/warning lamp, and can be further modified to have the above-described vehicle lamp effect.

Drawings

Other features and advantages of the present invention will become apparent from the following detailed description of the preferred embodiments with reference to the accompanying drawings, in which:

fig. 1 is a perspective view illustrating a conventional lamp device for a vehicle;

fig. 2 is a perspective view illustrating an exit lens and a plurality of entrance lenses of the conventional vehicular lamp device;

fig. 3 is a sectional view illustrating the conventional lamp device;

FIG. 4 is a fragmentary cross-sectional view illustrating the optical principles of the prior art vehicle light assembly;

fig. 5 is a perspective view illustrating an embodiment of the lamp device and the lamp system according to the present invention;

FIG. 6 is a perspective view illustrating the embodiment at a different angle than FIG. 5;

FIG. 7 is a cross-sectional view illustrating the embodiment;

FIG. 8 is a fragmentary top plan view illustrating the embodiment;

FIG. 9 is a fragmentary sectional view, enlarged to illustrate a partial structure of the embodiment;

FIG. 10 is a perspective cross-sectional view illustrating the configuration of a light incident surface and a parabolic reflecting surface of the embodiment;

FIG. 11 is a cross sectional view of a horizontal cut through a plurality of slanted reflective surfaces, with the view angle from top to bottom; and

fig. 12 is a cross-sectional view, which is horizontally cut through an extended junction formed by two groups of the oblique reflective surfaces, and the viewing angle is from bottom to top.

Detailed Description

In the following description, similar or identical elements will be denoted by the same reference numerals.

Referring to fig. 5 to 7, one embodiment of the present invention is a car light system, and comprises a plurality of car light devices 2 connected in a left-right arrangement. Since the design principles of the lamp devices 2 are the same, in the following description, one of the lamp devices 2 will be mainly taken as a representative.

The car light device 2 is suitable for projecting light forward, and includes a light-emitting lens 3 that is located the place ahead, and two are located 3 rear of light-emitting lens and the optical unit 4 of arranging from top to bottom.

Referring to fig. 5, 7 and 8, fig. 8 is a top view, and a front view is shown below the drawing plane of fig. 8. The light-emitting lens 3 is formed with a through space S11 located at the center, formed by a breaking method, and penetrating up and down, and includes a front light-emitting surface 31, a front light-entering surface 32, and a fresnel light-emitting surface 33 arranged in sequence from front to back.

The front light emitting surface 31 is located at the foremost end of the light emitting lens 3 and faces forward, and has a texture design. The flower-biting design is formed by arranging a plurality of forward convex curved surfaces up and down and left and right. The front light incident surface 32 is located between the front light emitting surface 31 and the fresnel light emitting surface 33 and faces the penetrating space S11 backward, the fresnel light emitting surface 33 is located behind the front light emitting surface 31 at intervals, and the front light incident surface 32 is located between the front light emitting surface 31 and the fresnel light emitting surface 33 at intervals.

The fresnel exit surface 33 is located behind the through space S11 and faces forward to the through space S11. The fresnel exit surface 33 includes a plurality of exit surface portions 331 extending upward and downward. Therefore, the fresnel exit surface 33 defines an exit focal point F11 (only a plurality of which are illustrated as representative) in real focus at different heights or different horizontal planes. The light-exiting focuses F11 at different levels are arranged up and down in a straight line extending up and down and constitute a focus unit F10 (see fig. 7).

Referring to fig. 5, 7 and 9, each optical unit 4 of the vehicular lamp device 2 includes a light source 5 and an incident lens 6 arranged in an up-and-down manner.

Each of the light sources 5 of the vehicle lamp device 2 of the present embodiment can provide light projected in the up-down direction toward a respective one of the light incident lenses 6. In the present embodiment, in order to achieve different vehicular lamp effects, the light source 5 located above is different from the light source 5 located below. Specifically, the light source 5 located above is a running light source 5 (white light source 5), and the light source 5 located below is a direction light source 5 (yellow light source 5). In addition, the light source 5 can emit light in different time sequences according to different positions, for example, the light source is gradually turned on from right to left.

Since the structures of the light entrance lenses 6 of the optical units 4 are vertically symmetrical to each other, the light entrance lenses 6 of the upper optical units 4 and the corresponding light sources 5 will be mainly used as representatives in the following description, but the two upper and lower optical units 4 may be integrated together for the purpose of describing the relative relationship.

The light entrance lens 6 includes an end surface 61 facing upward to face the light source 5, an inclined reflection surface 62 which is spaced from the end surface 61 up and down and is located below the end surface 61 and extends forward and inclined by about 45 degrees with respect to a vertical plane, a light entrance surface 63 which is recessed from the end surface 61 downward toward the inclined reflection surface 62 in the up and down direction, two parabolic reflection surfaces 64 which extend from the end surface 61 downward toward the inclined reflection surface 62 and are located on front and rear sides of the light entrance surface 63, and two side reflection surfaces 65 which extend forward from left and right sides of the inclined reflection surface 62, respectively (see fig. 11 for assistance).

The inclined reflective surfaces 62 of one of the optical units 4 extend obliquely downward and intersect the inclined reflective surfaces 62 extending obliquely upward of the other optical unit 4 to form an extending boundary 621 (see fig. 6) extending left and right and located between the inclined reflective surfaces 62.

The light incident surface 63 surrounds a light incident space S12 defining an opening S121 facing upward and toward the light source 5, and includes a main surface portion 631 facing the opening S121 opposite to the opening S121 and facing the opening S121, and a ring surface portion 632 extending from the end surface 61 to the main surface portion 631 and connected to the main surface portion 631.

The main surface portion 631 is a convex transparent surface protruding upward toward the light source 5 and defines a convex transparent focus F12 (see fig. 9 for illustration) at a position overlapping the position of the light source 5. The annular surface portion 632 and the main surface portion 631 cooperate to define the light incident space S12.

Next, the design principle of the light incident surface 63 and the parabolic reflecting surface 64 will be described. Referring to fig. 7, 9 and 10, a rotation axis L11 of a symmetrical line extending back and forth and passing through the opening S121 in left-right symmetry as shown in fig. 10 and a cross-sectional plane passing through the rotation axis L11 are defined. The cutting planes can be cutting planes of different angles, which are taken as vertical cross sections in the following description, and the illustration and numbering of the cutting planes are omitted in fig. 10 since the illustration of the vertical cross sections can be imagined and understood by the skilled person.

The cutting plane and each parabolic reflecting surface 64 define a first cutting line L21 extending from top to bottom as shown in fig. 9 and 10. The cutting plane and the annular portion 632 define two second cutting lines L22 located inside the first cutting line L21 and extending from top to bottom slightly toward each other as shown in fig. 9 and 10. The top end of each second cross-sectional line L22 is connected with a respective first cross-sectional line L21. The cutting plane and the main face 631 define a third cutting line L23 extending anteroposteriorly but being convex upward. The front end and the rear end of the third sectional line L23 are respectively connected with the bottom end of the second sectional line L22.

Each of the first sectional lines L21 is a parabola defining a parabola focus F21. Since the first section line L21 is symmetrical in the left-right direction, the parabolic focus F21 is also symmetrical in the left-right direction, and only one of them is shown in fig. 9 and 10 as a representative.

Each of the second cross-sectional lines L22 is designed such that when light is refracted by a respective one of the second cross-sectional lines L22, the extension lines meet to form an imaginary focus F22 overlapping the parabolic focus F21 of the respective one of the first cross-sectional lines L21.

The parabolic reflection surfaces 64 are respectively defined by the first sectional line L21 and rotated by 180 degrees from left to right about the rotation axis L11, and thus take a shape similar to a part of a conical surface. After the second section line L22 is turned by 180 degrees in a left-right direction about the rotation axis L11, the trajectories are connected to each other to form the annular portion 632 by one turn. The main surface portion 631 is rotated by 90 degrees in the left-right direction about the rotation axis L11 by 180 degrees by the third sectional line L23, thereby forming the convex surface as described above.

Referring to fig. 5, 6 and 11, fig. 11 is a cross-sectional view taken through the upper inclined reflective surface 62 and the side reflective surface 65 of the optical unit 4 at a position intermediate in the vertical direction, and the view angle is from the top to the bottom, so that the upper and incomplete inclined reflective surface 62, the lower inclined reflective surface 62, and an extended boundary 621 formed by the two inclined reflective surfaces 62 are seen in fig. 11. Each side reflecting surface 65 defines a side parabola L31 with a horizontal cross section (not shown) as shown in fig. 11. One side parabolic focus F31 of each side parabola L31 overlaps a respective one of the light-emitting focuses F11 defined by the Fresnel light-emitting surface 33.

The operation of the present embodiment will be described. Referring to fig. 9, 10 and 12, a part of the light rays projected by the light source 5 enter from the main surface portion 631 of the light incident surface 63, and since the light source 5 is located on the convex focal point F12 of the main surface portion 631, the light rays entering from the main surface portion 631 generally proceed parallel to each other toward the oblique reflection surface 62 as shown in fig. 9.

The other part of the light projected by the light source 5 is incident from the annular surface portion 632 of the light incident surface 63, refracted by the annular surface portion 632, and then reflected by the parabolic reflecting surface 64. In addition, since the light rays refracted by the annular surface portion 632 have extended lines meeting at the virtual focus F22 and the virtual focus F22 overlaps the parabolic focus F21, the light rays reflected by the parabolic reflecting surface 64 travel in parallel to each other toward the inclined reflecting surface 62 as shown in fig. 9.

Since the light incident surface 63 and the parabolic reflecting surface 64 are formed by rotating the first, second and third sectional lines L21, L22 and L23 about the rotation axis L11 by 180 degrees, the light generated by the light source 5 acts on the light incident surface 63 and the parabolic reflecting surface 64 to generate a rectangular light shape having a longitudinal direction and a lateral direction which are the same as each other and a width direction and a front-rear direction which are the same as each other with respect to a horizontal plane, and the rectangular light shape is projected on the oblique reflecting surface 62 to form a trapezoidal light shape P11 as shown in fig. 12 because the oblique reflecting surface 62 extends obliquely. Fig. 12 is a bottom cross-sectional view of the extended boundary 621 from bottom to top, and the inclined reflective surface 62 is illustrated as an upper inclined reflective surface 62.

Referring to fig. 7, 9 and 11, the light rays traveling to the inclined reflective surface 62 to form the trapezoidal light shape P11 and reflected by the inclined reflective surface 62 intersect to form a plurality of intersecting focal points F41 arranged above and below and respectively overlapping the light-emitting focal point F11 (see the middle 3 tracks of 5 tracks in fig. 11). That is, since the light rays reflected by the inclined reflection surface 62 are emitted from the light-emitting focal point F11 of the fresnel light-emitting surface 33, the light rays are emitted from the fresnel light-emitting surface 33 and then travel back and forth and are almost parallel to each other as shown in fig. 7. The light emitted forward through the fresnel exit surface 33 passes through the through space S11, and is incident forward on the front light entrance surface 32, and finally emitted out through the front light exit surface 31, thereby playing a warning role.

The light reflected by the inclined reflective surface 62 passes through the fresnel exit surface 33 on the same horizontal plane, most of which is shown as 3 traces in the middle of fig. 11, but some of the light travels to the left and right sides as shown as 2 traces at the top of fig. 11. The light traveling to the left and right sides is reflected by the side reflecting surfaces 65 as shown in fig. 11. Since the side parabolic focuses F31 of each side parabola L31 of the side reflecting surface 65 overlap with the respective light-emitting focuses F11 as described above, the light reflected by the side reflecting surface 65 is emitted from the light-emitting focuses F11 of the fresnel light-emitting surface 33. In this way, the light beams traveling to the left and right sides and reflected by the side reflection surfaces 65 travel forward as shown in fig. 11 and are substantially parallel to each other, and do not pass through the fresnel exit surface 33 and the front light incident surface 32, and are directly emitted from the front light exit surface 31.

In the present embodiment, since the light source 5 above the lamp device 2 is a driving lamp light source 5 providing white light, and the light source 5 below the lamp device 2 is a direction lamp light source 5 providing yellow light, the present embodiment has both functions of driving lamp and direction lamp. In other embodiments of the present invention, the light source 5 can also provide red light, so that the present invention can have one of a plurality of functions, such as a driving light, a direction light, and a brake light, or several of them. That is to say, the utility model has the characteristics that the usage can be diversified.

In addition, the present embodiment has a plurality of the light sources 5, and the light sources 5 can emit light sequentially and alternately according to the difference of the positions and/or time points. For example, the light sources 5 of the upper row emit light, while the light sources 5 of the lower row do not emit light and are used alone as running lights. Or when the LED lamp is used as a driving lamp, the light sources 5 arranged on the upper row can sequentially emit light in turn, so that the effect of a sequence lamp is generated. Or the light sources 5 in the upper row and the lower row can alternately flash in a wheel flow mode by taking the row as a unit, so that the warning lamp effect different from that of a running lamp and a direction lamp is generated, and the lamp is multipurpose, particularly.

To sum up, the utility model discloses car light device and car light system's efficiency lies in: a product different from the conventional design is provided, which is suitable for being used as a single driving lamp, daytime running lamp, direction lamp, warning lamp, and can be further changed to have the vehicle lamp effect.

The above description is only an embodiment of the present invention, and the scope of the claims of the present invention should not be limited thereto, and the equivalent modifications made according to the claims and the description of the present invention should be covered by the scope of the claims of the present invention.

Claims (10)

1. The utility model provides a car light device is applicable to toward the front projection light to contain light-emitting lens, and at least one optical unit, light-emitting lens is including being located the front end and face the place ahead and be applicable to the preceding play plain noodles that supply the light to shoot forward, at least one optical unit includes the light source of arranging from top to bottom and goes into optical lens, the light source can provide on the upper and lower direction toward go into the light that optical lens throwed, go into optical lens including the orientation the terminal surface of light source, its characterized in that: the light-emitting lens is still located including the interval before the interval the surface rear of the play plain noodles and the fresnel play plain noodles that face the place ahead to and the interval is located before go out the plain noodles with the fresnel go out between the plain noodles and the preceding income plain noodles that face the place behind, fresnel goes out the plain noodles and defines out the focus unit, go in the plain lens still include with interval and down the terminal surface and down the interval and toward the preceding oblique plane of reflection that incline to extend, by in the upper and lower direction the terminal surface toward the concave income plain noodles of oblique plane of reflection, and two by the terminal surface is past the oblique plane of reflection extends and is located respectively the parabolic plane of reflection of going in both sides around the income plain noodles, the warp income plain noodles is incided and is passed through the oblique plane of reflection and toward the light that fresnel goes out the plain noodles and march, the extension line meet in the focus unit.

2. The lamp device according to claim 1, wherein: the light incident surface surrounds and defines a light incident space with an opening facing the light source, the light incident surface comprises a main surface portion opposite to the opening and facing the opening, an annular surface portion extending from the end surface to the main surface portion and connected with the main surface portion, the main surface portion protrudes towards the light source, a convex transparent focus located on the light source is defined, the light incident space is defined by matching with the annular surface portion, a rotation axis extending back and forth and passing through the symmetry center of the opening and a section plane passing through the rotation axis are defined, the section plane and each parabolic reflection surface define a first section line, the section plane and the annular surface portion define two second section lines, the section plane and the main surface portion define a third section line, each first section line is a parabolic line defining a parabolic focus point, and after being refracted by the respective second section line, the extension lines intersect to form an imaginary focus point of the parabolic focus point overlapping the respective first section lines.

3. The vehicular lamp device according to claim 2, characterized in that: the parabolic reflecting surfaces are respectively defined by the first sectional line and the rotation axis as an axis for 180 degrees, the annular surface part is defined by the second sectional line and the rotation axis as an axis for 180 degrees, and the main surface part is defined by the third sectional line and the rotation axis as an axis for 180 degrees.

4. The vehicular lamp device according to claim 3, characterized in that: the light provided by the light source is refracted by the main surface part or is refracted by the annular surface part and then reflected by the parabolic reflecting surface, and a trapezoidal light shape is formed on the inclined reflecting surface.

5. The vehicular lamp device according to claim 4, characterized in that: the Fresnel light-emitting surface defines a plurality of light-emitting focuses arranged up and down, the light-emitting focuses form the focus unit to form trapezoidal light rays, and the trapezoidal light rays are reflected by the inclined reflecting surface, and extension lines intersect to form a plurality of intersection focuses arranged up and down and respectively overlapped with the light-emitting focuses.

6. The vehicular lamp device according to claim 1, characterized in that: the Fresnel light-emitting surface defines a plurality of light-emitting focuses arranged up and down, the light-emitting focuses form the focus unit, and the light reflected by the inclined reflecting surface and the extension lines meet to form a plurality of meeting focuses arranged up and down and respectively overlapped with the light-emitting focuses.

7. The vehicular lamp device according to claim 1, characterized in that: the Fresnel light-emitting surface defines a plurality of light-emitting focuses arranged up and down, the light-emitting focuses form the focus unit, the light-entering lens further comprises two side reflecting surfaces which respectively extend forwards from the left side and the right side of the oblique reflecting surface, each side reflecting surface and the horizontal plane define a side parabolic curve, and the side parabolic focuses of each side parabolic curve are overlapped with the respective light-emitting focuses.

8. The vehicular lamp device according to claim 1, characterized in that: the inclined reflective surface is inclined at 45 degrees to the vertical.

9. The vehicular lamp device according to claim 1, characterized in that: the car lamp device comprises two optical units, wherein the light colors provided by the light sources of the optical units are different from each other and can be controlled to emit light according to different time sequences.

10. A vehicle lamp system characterized in that: the vehicle lamp system comprises a plurality of vehicle lamp devices according to any one of claims 1 to 8, each of the vehicle lamp devices comprises two optical units arranged above and below, the light colors provided by the light sources of the optical units are not identical to each other, and the light sources of the optical units can be controlled to emit light simultaneously and can be controlled to emit light at different timings.

Images