Patent Description:
A lighting fixture includes a light source and a lens. After a traditional lighting fixture is assembled, a distance between the light source and the lens is fixed and cannot be adjusted, so that a beam angle of the lighting fixture cannot be adjusted according to different application scenarios. For example, under the application scenario having high requirements on light condensing, if the light condensing effect of the lighting fixture is poor, the emitted light is relatively divergent, then it's unable to adjust the beam angle of the lighting fixture, which results in inconvenience.

The existing technology also proposes a lighting fixture in which the lens is connected with a lamp housing, and a position of the lens is changeable by adjusting a position of the lamp housing, so as to achieve the purpose of adjusting the distance between the lens and the light source. However, such an adjustment structure is complex and the adjustment process is cumbersome. <CIT> discloses to provide a plurality of stepped pins on a lens body. These stepped pins have at least one step each, and at least one pair of stepped pins whose shape of step and dimension are same are arranged at the positions facing each other with lens surface sandwiched. At least two kinds of pins have different numbers of steps. A plurality of holes engaging with stepped pins of the lens body, are provided on a substrate. Stepped pins of the lens body engage with holes having diameters corresponding to predetermined diameters of stepped pins to determine a focusing position of lens face. Holes engaged with stepped pins are changed by rotating the lens body, thereby the focusing position of lens face moves. <CIT> describes a lens body, a light source unit and a lighting system, which can reduce the cost by using a common lens, are provided. Substantially cylindrical supporting units are formed at both sides of a lens. The supporting units are to adjust the separation distance between the lens and the surface of a substrate depending on the height dimension of a light emitting diode mounted on the substrate from the substrate face when the lens body is fixed to the substrate. A cylindrical convex part is formed at a part of the tip face of the supporting unit in a concentric fashion relative to the supporting unit, and a cylindrical positioning unit is formed at a part of the tip face of the convex part in a concentric fashion. The positioning unit functions as a member for positioning when the substrate and the lens body are fixed to each other. <CIT> discloses a light module which includes a light engine having a printed circuit board and an array of light emitting diodes coupled to the printed circuit board. The printed circuit board has a power connector interface defining a separable interface for coupling with a power connector of the light module. A base ring holds the light engine and has side walls defining a cavity. The side walls have a securing feature. An optical component is received in the cavity and is positioned to receive light from the LEDs. The optical component has a predetermined lighting characteristic and emits the light generated by the LEDs in accordance with the predetermined lighting characteristic. A top cover is coupled to the base ring and has a securing feature engaging the securing feature of the base ring to couple the top cover to the base ring.

The technical problem to be solved by the present application lies in providing a lens, a light source module and a lighting device which allows for adjustable beam angle and convenient adjustment.

The technical solutions of the present application are as follows:.

A lens, including a lens body and at least two positioning columns, wherein the lens body has a light incident surface and a light exiting surface, an inner end of the positioning column is connected to the light incident surface, an outer end of the positioning column is a free end, and a direction from the outer end to the inner end of the positioning column is a first direction;.

According to the invention, the positioning column is a stepped shaft, the positioning segment is a shaft segment, and areas of cross-sectional surfaces of at least three shaft segments are sequentially increased in the first direction.

Preferably, in the above lens, a peripheral surface of the stepped shaft is provided with at least one groove.

Preferably, in the above lens, the light incident surface is provided with a light guiding groove, and the light guiding groove is recessed towards the light exiting surface.

According to the invention, an external rim of the lens body is provided with at least two first positioning grooves which are distributed at intervals, and the number of the first positioning grooves is one less than the number of the shaft segments.

Preferably, in the above lens, the light exiting surface is provided with at least two angle scales, and the at least two angle scales are arranged in one-to-one correspondence with the at least two first positioning grooves.

A light source module, including a light source assembly and the lens described above, wherein the light source assembly includes a light source plate and a lamp body arranged on the light source plate, and at least two groups of positioning holes are also arranged on the light source plate; each group of positioning holes includes at least two positioning holes, and areas of the at least two positioning holes in each group of positioning holes are different; the positioning segment with the first area larger than an area of the positioning hole is a lower positioning segment; the positioning hole is sleeved and matched with the positioning segment, and a position of the positioning hole is limited by the lower positioning segment.

Preferably, in the above light source module, the lens body and the light source plate are detachably connected through a connecting piece.

Preferably, in the above light source module, an edge of the light source plate is provided with a second positioning groove.

A lighting device, including a lamp housing, a power supply assembly and the light source module described above, wherein the power supply assembly is electrically connected with the light source assembly; the lamp housing is provided with a mounting cavity, and the light source module is mounted in the mounting cavity; the lamp housing is provided with a light outlet, and a distance between the lens and the light outlet is smaller than a distance between the light source assembly and the light outlet.

Preferably, in the above lighting device, the power supply assembly includes a driving power supply, and the driving power supply is arranged in the mounting cavity.

Preferably, the above lighting device further includes a base, and the lamp housing is rotatably connected with the base.

Preferably, in the above lighting device, the light outlet is provided with a transparent light-transmitting mask, and the diffuser is hermetically connected with the lamp housing.

Preferably, in the above lighting device, the edge of the light source plate is provided with a second positioning groove, the second positioning groove is communicated with one of the first positioning grooves to constitute a main positioning groove; an inner wall of the lamp housing is provided with a positioning body which is in limited fit with the main positioning groove.

Preferably, in the above lighting device, a support ring is arranged on the inner wall of the lamp housing, the support ring is in limited fit with the light source plate, an avoidance groove is arranged on the support ring, and the yielding groove is arranged opposite to and communicated with the positioning hole.

The present application has the advantages that: because at least three positioning segments are sequentially distributed in the first direction and the first areas of the at least three positioning segments are sequentially increased in the first direction, two adjacent positioning segments form a limiting surface at an interface there-between; and because the number of the positioning segments is at least three, the at least three positioning segments form at least two limiting surfaces. After the lens of the present application is connected with the light source assembly, the positioning columns are sleeved and matched with the positioning holes with different sizes in the light source assembly, and the positioning holes with different sizes are limited on different limiting surfaces, so that different distances are formed between the lens and the light source assembly, thereby achieving the purpose of adjusting the beam angle and facilitating the adjustment of the beam angle.

The names and labels of components in the drawing are as follows:
Lens <NUM>, lens body <NUM>, light incident surface <NUM>, light guiding groove <NUM>, light exiting surface <NUM>, light incident side <NUM>, light emergent side <NUM>, positioning column <NUM>, first positioning segment <NUM>', second positioning segment <NUM>", third positioning segment <NUM>‴, fourth positioning segment <NUM>"", first limiting surface <NUM>', second limiting surface <NUM>", third limiting surface <NUM>‴, groove <NUM>, first positioning groove <NUM>, first connecting hole <NUM>, angle scale <NUM>, light source assembly <NUM>, light source plate <NUM>, first positioning hole <NUM>', second positioning hole <NUM>", third positioning hole <NUM>‴, second connecting hole <NUM>, lamp body <NUM>, second positioning groove <NUM>, lighting device <NUM>, lamp housing <NUM>, mounting cavity <NUM>, light outlet <NUM>, mounting end <NUM>, positioning body <NUM>, support ring <NUM>, first avoidance groove <NUM>', second avoidance groove <NUM>", third avoidance groove <NUM>'", avoidance hole <NUM>, bottom cover <NUM>, through hole <NUM>, third connecting hole <NUM>, light-transmitting mask <NUM>, compression ring <NUM>, connecting post <NUM>, sealing ring <NUM>, driving power supply <NUM>, electric wire <NUM>, base <NUM>, strip hole <NUM>, hinged shaft <NUM>, connecting piece <NUM>.

The present embodiment discloses a lens <NUM>, which includes a lens body <NUM> and at least two positioning columns <NUM>; the lens body <NUM> has a light incident surface <NUM> and a light existing surface <NUM>; an inner end of the positioning column <NUM> is connected to the light incident surface <NUM>, an outer end of the positioning column <NUM> is a free end, and the direction from the outer end to the inner end of the positioning column <NUM> is the first direction. The positioning column <NUM> includes at least three positioning segments which are sequentially distributed in the first direction. A plane perpendicular to an axis of the positioning segment is a projection plane, and a projection of the positioning segment on the projection plane is a first projection, an area enclosed by an outer contour line of the first projection is a first area, and the first areas of the at least three positioning segments are sequentially increased in the first direction.

The lens <NUM> of the present embodiment has the advantages that: because at least three positioning segments are sequentially distributed in the first direction and the first areas of the at least three positioning segments are sequentially increased in the first direction, two adjacent positioning segments form a limiting surface at an interface; and because the number of the positioning segments is at least three, the at least three positioning segments form at least two limiting surfaces. After the lens <NUM> in the present embodiment is connected with a light source assembly <NUM>, the positioning columns <NUM> are sleeved and matched with positioning holes with different sizes in the light source assembly <NUM>, and the positioning holes with different sizes are limited on different limiting surfaces, so that different distances are formed between the lens <NUM> and the light source assembly <NUM> in the present embodiment, thereby achieving the purpose of adjusting the beam angle and facilitating the adjustment of the beam angle.

Preferably, the positioning column <NUM> is a stepped shaft, the positioning segment is a shaft segment, and areas of cross-sectional surfaces of at least three shaft segments are sequentially increased in the first direction. The shaft segment may be cylindrical, that is, a cross section of the cylindrical shaft segment is circular. The shaft segment can also be prismatic, that is, a cross section of the prismatic shaft segment is polygonal. Preferably, the shaft segment of the present embodiment is cylindrical, which has the following advantages: firstly, it is convenient to fabricate the positioning column <NUM>; secondly, after the lens <NUM> is connected with the light source assembly <NUM>, the positioning column <NUM> and the positioning hole of the light source assembly <NUM> can be matched at any rotation angle, thus facilitating the connection between the lens <NUM> and the light source assembly <NUM> and also facilitating the adjustment of the distance between the lens <NUM> and the light source assembly <NUM> by rotating the lens <NUM>.

As shown in <FIG>, preferably, a periphery surface of the stepped shaft is provided with at least one groove <NUM>, and the groove <NUM> can be arranged along the first direction or inclined relative to the first direction. After the groove <NUM> is provided, the first areas of the at least three positioning segments are still increased sequentially in the first direction, and two adjacent positioning segments can still form a limiting surface at the interface. After the lens <NUM> is connected with the light source assembly <NUM>, the positioning columns <NUM> are sleeved and matched with positioning holes with different sizes in the light source assembly <NUM>, and the positioning holes with different sizes can still be limited on different limiting surfaces. The advantages of the grooves <NUM> are as follows: firstly, it can save materials; secondly, it can reduce the weight of the positioning column <NUM>, thus reducing the weight of the whole lens <NUM>.

In <FIG>, the number of the grooves <NUM> is four, and the four grooves <NUM> are evenly distributed along a circumferential direction. In the present embodiment, the number of the grooves <NUM> may also be one, two, three, five and the like. In <FIG>, there are four positioning segments, which are a first positioning segment <NUM>', a second positioning segment <NUM>", a third positioning segment <NUM>‴ and a fourth positioning segment 141ʺʺ in the first direction, sequentially, wherein the third positioning segment <NUM>‴ and the fourth positioning segment 141ʺʺ are provided with a groove <NUM>, and the third positioning segment <NUM>‴ and the fourth positioning segment 141ʺʺ share a same groove <NUM>. In the present embodiment, each positioning segment may be provided with the groove <NUM> independently, or at least two positioning segments may share the groove <NUM>, or all positioning segments may share the groove <NUM>. In the present embodiment, the number of the positioning segments can also be <NUM>, <NUM>, <NUM> and the like.

As shown in <FIG>, preferably, the light incident surface <NUM> is provided with a light guiding groove <NUM>, and the light guiding groove <NUM> is recessed towards the light exiting surface <NUM>. The function of the light guiding groove <NUM> is to improve the light emitting efficiency. In <FIG>, the number of the light guiding grooves <NUM> is three, and lines connecting centers of the three light guiding grooves <NUM> can form an isosceles triangle. Preferably, the lines connecting the centers of the three light guiding grooves <NUM> form an equilateral triangle. The advantage of uniform distribution of the light guiding grooves <NUM> is that, the lens <NUM> has a better light equalizing effect. In the present embodiment, the number of the light guiding grooves <NUM> can also be <NUM>, <NUM>, <NUM> and the like. In the present embodiment, the light guiding structure on the lens body <NUM> can also be a spot-shaped light distribution part besides the light guiding groove <NUM>; there may be serval spot-shaped light distribution parts, and the several spot-shaped light distribution parts are distributed on the lens body <NUM>. The light guiding structure on the lens body <NUM> of the present embodiment can also be an annular-shaped light distribution part, which can be integrally formed with the lens body <NUM>.

As shown in <FIG>, preferably, an external rim of the lens body <NUM> is provided with at least two first positioning grooves <NUM> which are distributed at intervals, and the number of the first positioning grooves <NUM> is one less than the number of the shaft segments. That is, the number of the first positioning grooves <NUM> in the present embodiment is the same as that of the limiting surfaces. Since the positioning holes with different sizes in the light source assembly <NUM> are arranged at different positions, the lens body <NUM> needs to be rotated to fit with the positioning holes with different sizes in the light source assembly <NUM>, and the positioning holes with different sizes are limited on different limiting surfaces. After the lens body <NUM> rotates, in order to better fix the lens body <NUM> and the light source assembly <NUM>, it is necessary to limit the lens body <NUM> and the light source assembly <NUM>. An inner wall of the lamp housing <NUM> is provided with a positioning body <NUM>, and the positioning body <NUM> is in limited fit with the first positioning groove <NUM>. The number of the positioning body <NUM> is one, so the number of the first positioning grooves <NUM> needs to be the same as the number of the limiting surfaces. Every time when the lens body <NUM> rotates, it enables one first positioning groove <NUM> to be arranged opposite to the positioning body <NUM> on the inner wall of the lamp housing <NUM> and to be in limited fit with the positioning body <NUM>.

As shown in <FIG>, preferably, the light exiting surface <NUM> is provided with at least two angle scales <NUM>, and the at least two angle scales <NUM> are arranged in one-to-one correspondence with the at least two first positioning grooves <NUM>. The value of the angle scale <NUM> is the angle of the beam angle. The advantage of setting the angle scale <NUM> is that, it is convenient to adjust the distance between the lens <NUM> and the light source assembly <NUM>, so as to adjust the angle of the beam angle. When the angle of the beam angle needs to be adjusted, the lens <NUM> is rotated so that the first positioning groove <NUM> corresponding to the target angle scale <NUM> is in limited fit with the positioning body <NUM> on the inner wall of the lamp housing <NUM>. At this time, the beam angle is the target angle scale <NUM>, which results it convenient to adjust the beam angle. Therefore, another advantage of the first positioning groove <NUM> of the present embodiment is that, the angle scale <NUM> can be combined with the positioning body <NUM> on the inner wall of the lamp housing <NUM>, which is convenient for the operator to adjust the beam angle.

The present embodiment discloses a light source module, which includes a light source assembly <NUM> and the lens <NUM> of the first embodiment. As shown in <FIG>, the light source assembly <NUM> includes a light source plate <NUM> and a lamp body <NUM> arranged on the light source plate <NUM>, and the light source plate <NUM> is also provided with at least two groups of positioning holes. Each group of positioning holes includes at least two positioning holes, and areas of the at least two positioning holes of each group of positioning holes are different. The positioning segment with the first area larger than an area of an orifices of the positioning hole is a lower positioning segment. The positioning hole is sleeved and matched with the positioning segment, and the positioning hole is limited by the lower positioning segment. As shown in <FIG>, the light source plate <NUM> is located on the light incident side <NUM> of the lens <NUM>.

The light source module of the present embodiment has the advantages that: because at least three positioning segments are sequentially distributed in the first direction and the first areas of the at least three positioning segments are sequentially increased in the first direction, two adjacent positioning segments form a limiting surface at an interface; and because the number of the positioning segments is at least three, the at least three positioning segments form at least two limiting surfaces. After the lens <NUM> is connected with the light source assembly <NUM>, the positioning columns <NUM> are sleeved and matched with positioning holes with different sizes in the light source assembly <NUM>, and the positioning holes with different sizes are limited on different limiting surfaces, so that different distances are formed between the lens <NUM> and the light source assembly <NUM> in the present embodiment, and the purpose of adjusting the beam angle is achieved; that is, the beam angle of the light source module in the present embodiment is adjustable, and it is convenient to adjust the beam angle.

There may be three lamp bodies <NUM> and three light guiding grooves <NUM>, and the three lamp bodies <NUM> are arranged in one-to-one correspondence with the three light guiding grooves <NUM>.

In the present embodiment, the number of the positioning holes is the same as the number of the positioning columns <NUM>. Since the number of the positioning columns <NUM> is at least two, the number of the positioning holes is at least two. In the present embodiment, the number of the groups of positioning holes can also be two, and accordingly, the number of the positioning columns <NUM> is two. The number of the groups of positioning holes can also be three, and accordingly, the number of the positioning columns <NUM> is three. The number of the groups of positioning holes can also be four, and accordingly, the number of the positioning columns <NUM> is four. In order to better position the lens <NUM> and the light source assembly <NUM> and to save costs, the number of the positioning holes in the present embodiment is preferably three. There are three groups of positioning holes in <FIG>, and correspondingly, there are three positioning columns <NUM>.

In the present embodiment, the number of the positioning holes in each group of positioning holes is the same as the number of the limiting surfaces, and the positioning column <NUM> includes at least three positioning segments, that is, the number of the limiting surfaces is at least two, so the number of the positioning holes in each group of positioning holes is at least two. Preferably, the number of the positioning holes in each group of positioning holes in the present embodiment is three. Each group of positioning holes includes a first positioning hole <NUM>', a second positioning hole <NUM>" and a third positioning hole <NUM>‴, in sequence, according to an area of the hole from small to large. The first positioning segment <NUM>' and the second positioning segment <NUM>" form a first limiting surface <NUM>' at the interface; the second positioning segment <NUM>" and the third positioning segment <NUM>‴ form a second limiting surface <NUM>" at the interface; the third positioning segment <NUM>‴ and the fourth positioning segment <NUM>"" form a third limiting surface <NUM>‴ at the interface.

With reference to <FIG> and <FIG>, the third positioning holes <NUM>‴ of the three groups of positioning holes are all sleeved and matched with the third positioning segment <NUM>‴, and are limited by three third limiting surfaces <NUM>'". For example, the beam angle at this time is <NUM> degrees.

With reference to <FIG> and <FIG>, the second positioning holes <NUM>" of the three groups of positioning holes are all sleeved and matched with the second positioning segment <NUM>", and are limited by three second limiting surfaces <NUM>". At this time, the beam angle is decreased, for example, the beam angle is <NUM> degrees.

With reference to <FIG> and <FIG>, the first positioning holes <NUM>' of the three groups of positioning holes are all sleeved and matched with the first positioning segment <NUM>', and are limited by three first limiting surfaces <NUM>'. At this time, the beam angle is further decreased, for example, the beam angle is <NUM> degrees.

Preferably, the lens body <NUM> and the light source plate <NUM> are detachably connected by a connecting piece <NUM>. After the beam angle is adjusted, the lens body <NUM> and the light source plate <NUM> are connected together by the connecting piece <NUM>, so that the positions of the lens body <NUM> and the light source plate <NUM> are relatively fixed, and the angle of the beam angle is in a fixed state which will not be changed after adjustment.

As shown in <FIG>, the lens body <NUM> is provided with a first connecting hole <NUM>, and correspondingly, as shown in <FIG>, the light source plate <NUM> is provided with a second connecting hole <NUM>; the first connecting hole <NUM> and the second connecting hole <NUM> are arranged to be aligned; the connecting piece <NUM> can be a bolt; the connecting piece <NUM> passes through the first connecting hole <NUM> and the second connecting hole <NUM> to connect the lens body <NUM> and the light source plate <NUM> together.

Since the lens body <NUM> would rotate relative to the light source plate <NUM> when the beam angle is adjusted, in order to ensure that the first connecting hole <NUM> and the second connecting hole <NUM> can be aligned after each rotation, at least two first connecting holes <NUM> and at least two second connecting holes <NUM> are provided. The number of the first connecting holes <NUM> and the second connecting holes <NUM> may both be three.

Preferably, an edge of the light source plate <NUM> is provided with a second positioning groove <NUM>. The function of the second positioning groove <NUM> is to limit and cooperate with the positioning body <NUM> on the inner wall of the lamp housing <NUM>, thereby fixing the circumferential position of the light source plate <NUM> and preventing the light source plate <NUM> from rotating in the mounting cavity <NUM> of the lamp housing <NUM>.

As shown in <FIG>, the present embodiment discloses a lighting device <NUM>, which includes a lamp housing <NUM>, a power supply assembly and the light source module of the second embodiment, and the power supply assembly is electrically connected with the light source assembly <NUM>. The lamp housing <NUM> has a mounting cavity <NUM> in which the light source module is mounted. The lamp housing <NUM> has a light outlet <NUM>, and a distance between the lens <NUM> and the light outlet <NUM> is smaller than a distance between the light source assembly <NUM> and the light outlet <NUM>.

The lighting device <NUM> of the present embodiment has the advantages that: because at least three positioning segments are sequentially distributed in the first direction and the first areas of the at least three positioning segments are sequentially increased in the first direction, two adjacent positioning segments form a limiting surface at an interface; and because the number of the positioning segments is at least three, at least three positioning segments form at least two limiting surfaces. After the lens <NUM> is connected with the light source assembly <NUM>, the positioning columns <NUM> are sleeved and matched with positioning holes with different sizes in the light source assembly <NUM>, and the positioning holes with different sizes are limited on different limiting surfaces, so that different distances are formed between the lens <NUM> and the light source assembly <NUM> in the present embodiment, and the purpose of adjusting the beam angle is achieved; that is, the beam angle of the lighting device <NUM> in the present embodiment is adjustable, and it is convenient to adjust the beam angle.

Preferably, the power supply assembly of the present embodiment includes a driving power supply <NUM>, and the driving power supply <NUM> is arranged in the mounting cavity <NUM>. In the lighting device <NUM> of the present embodiment, the driving power supply <NUM> is arranged in the lamp housing <NUM>. Compared with an external power supply, the built-in power supply has better waterproof effect, so that the lighting device <NUM> of the present embodiment can be applied in outdoor environments.

Preferably, the lighting device <NUM> of the present embodiment further includes a base <NUM>, and the lamp housing <NUM> is rotatably connected with the base <NUM>, so that an angle of the lamp housing <NUM> can be adjusted as required; that is, an irradiation angle of the lighting device <NUM> can be adjusted. In the lighting device <NUM> of the present embodiment, not only the angle of the lamp housing <NUM> is adjustable, but also the beam angle is adjustable. As shown in <FIG>, the lamp housing <NUM> is connected with the base <NUM> through a hinged shaft <NUM>.

Preferably, the base <NUM> is provided with a strip hole <NUM>, and the power supply assembly further includes an electric wire <NUM>, an inner end of the electric wire <NUM> is electrically connected with the driving power supply <NUM>, an outer end of the electric wire <NUM> passes through the strip hole <NUM> to be located outside the base <NUM>, and the electric wire <NUM> is movably arranged in the strip hole <NUM>. The advantage of arranging the strip hole <NUM> is that, it is convenient to arrange the electric wire <NUM> without affecting the adjustment of the angle of the lamp housing <NUM>.

As shown in <FIG>, an end of the lamp housing <NUM> opposite to the light outlet <NUM> is a mounting end <NUM>, and the mounting end <NUM> is provided with a bottom cover <NUM> with a through hole <NUM>; the inner end of the electric wire <NUM> passes through the through hole <NUM> and enters the mounting cavity <NUM>, the inner end of the electric wire <NUM> is a waterproof joint, and the inner end of the electric wire <NUM> is electrically connected with the driving power supply <NUM>. The electric wire <NUM> is hermetically connected with the through hole <NUM> to prevent external water vapor from entering the mounting cavity <NUM>. The outer end of the electric wire <NUM> passes through the strip hole <NUM> for electrical connection with an external power source.

In order to further improve the waterproof effect of the lighting device <NUM><NUM> of the present embodiment, as shown in <FIG>, it is preferable that a transparent, light-transmitting mask <NUM> is mounted at the light outlet <NUM>, and the light-transmitting mask <NUM> is hermetically connected with the lamp housing <NUM>. As shown in <FIG>, the light-transmitting mask <NUM> is located on the light emergent side <NUM> of the lens <NUM>. A sealing ring <NUM> is arranged between the light-transmitting mask <NUM> and the lamp housing <NUM>, which further improves the waterproof effect of the lighting device <NUM>. As shown in <FIG>, the light-transmitting mask <NUM> is fixed to the lamp housing <NUM> by a compression ring <NUM>. A connecting post <NUM> is arranged on a surface of the compression ring <NUM> opposite to the lamp housing <NUM>, the lamp housing <NUM> is provided with a third connecting hole <NUM>, and the connecting post <NUM> is connected with the third connecting hole <NUM>, thereby fixing the light-transmitting mask <NUM> between the compression ring <NUM> and the lamp housing <NUM>.

Preferably, an edge of the light source plate <NUM> is provided with a second positioning groove <NUM>, which is communicated with one of the first positioning grooves <NUM> to constitute a main positioning groove. A positioning body <NUM> is arranged on the inner wall of the lamp housing <NUM>, and the positioning body <NUM> is in limited fit with the main positioning groove, so that the lens <NUM> and the light source plate <NUM> can be positioned in the circumferential direction, and the lens <NUM> and the light source plate <NUM> can be conveniently mounted.

The second positioning groove <NUM> can be communicated with one of the first positioning grooves <NUM>. In the process of adjusting the beam angle, after separating the lens body <NUM> from the light source plate <NUM>, rotating the lens body <NUM> to a required angle and then reconnecting the lens body <NUM> with the light source plate <NUM>. At this time, the other first positioning groove <NUM> is communicated with the second positioning groove <NUM>, and the second positioning groove <NUM> and the other first positioning groove <NUM> constitute a main positioning groove.

As shown in <FIG>, after the lens <NUM> is connected with the light source plate <NUM>, the positioning column <NUM> passes through the positioning hole, and the outer end of the positioning column <NUM> extends out of the positioning hole. After adjusting to different beam angles, the outer end of the positioning column <NUM> extends beyond the positioning hole by different distances. In order to facilitate the installation of the lens <NUM> and the light source plate <NUM>, preferably, the inner wall of the lamp housing <NUM> is provided with a support ring <NUM>, the support ring <NUM> is in limited fit with the light source plate <NUM>, and the support ring <NUM> is provided with an avoidance groove, the avoidance groove is opposite to and communicated with the positioning hole and used for allowing the outer end of the positioning column <NUM> to enter there-through.

As shown in <FIG>, the support ring <NUM> has an outer surface for supporting the light source panel <NUM> and an inner surface, and the driving power supply <NUM> is arranged between the inner surface of the support ring <NUM> and the bottom cover <NUM>. A center of the support ring <NUM> has a through hole, which is used for the driving power supply <NUM> to pass there-through and enter a space between the inner surface of the support ring <NUM> and the bottom cover <NUM>. The avoidance groove is provided on the outer surface of the support ring <NUM>.

Since the number of the positioning columns <NUM> is three, there are three groups of avoidance grooves. As the positioning column <NUM> has a first positioning segment <NUM>', a second positioning segment <NUM>" and a third positioning segment <NUM>‴, correspondingly, the number of the avoidance grooves in each group is three, and the three avoidance grooves are respectively a first avoidance groove <NUM>', a second avoidance groove <NUM>" and a third avoidance groove <NUM>'". The first avoidance groove <NUM>' is used for part of first positioning segments <NUM>' to enter there-through; the second avoidance groove <NUM>" is used for the first positioning segments <NUM>' and part of second positioning segments <NUM>" to enter there-through; and the third avoidance groove <NUM>‴ is used for the first positioning segments <NUM>', the second positioning segments <NUM>" and part of third positioning segments <NUM>‴ to enter there-through.

After the connecting piece <NUM> connects the lens body <NUM> and the light source plate <NUM>, part of the connecting piece <NUM> extends out of the second connecting hole <NUM>. In order to facilitate the installation of the lens <NUM> and the light source plate <NUM>, the outer surface of the support ring <NUM> is provided with an avoidance hole <NUM> for the end of the connecting piece <NUM> to enter there-through. The number of the avoidance holes <NUM> is the same as that of the first connecting holes <NUM> or the second connecting holes <NUM>.

Claim 1:
A lens (<NUM>), comprising a lens body (<NUM>) and at least two positioning columns (<NUM>), wherein the lens body (<NUM>) has a light incident surface (<NUM>) and a light exiting surface (<NUM>), an inner end of the positioning column (<NUM>) is connected to the light incident surface (<NUM>), an outer end of the positioning column (<NUM>) is a free end, and a direction from the outer end to the inner end of the positioning column (<NUM>) is a first direction;
the positioning column (<NUM>) comprises at least three positioning segments (<NUM>) which are sequentially distributed in the first direction;
a plane perpendicular to an axis of the positioning segment (<NUM>) is a projection plane, a projection of the positioning segment (<NUM>) on the projection plane is a first projection, an area enclosed by an outer contour line of the first projection is a first area, and first areas of at least three positioning segments (<NUM>) are sequentially increased in the first direction,
wherein the positioning column (<NUM>) is a stepped shaft, the positioning segment (<NUM>) is a shaft segment, and areas of cross-sectional surfaces of at least three shaft segments are sequentially increased in the first direction,
characterized in that
an external rim of the lens body (<NUM>) is provided with at least two first positioning grooves (<NUM>) which are distributed at intervals,
the number of the first positioning grooves (<NUM>) is one less than the number of the shaft segments.