Vehicular lighting fixture

Abstract

To provide a vehicular lighting fixture which enables optical axis adjustment of a light source unit to be performed with good accuracy.SOLUTION: An aiming part 30 includes: a mount ring 31 provided at a bracket; an adjustment nut 32 supported so as to slide freely in the frontward / backward direction with respect to a housing, in a state of being connected to the mount ring 31; and an adjustment bolt 33 which includes a male screw part 33a screwed with a female screw part 32a of the adjustment nut 32 and which is supported so as to rotate freely around a shaft with respect to the housing. The mount ring 31 includes: an opening part in which a tip side of the male screw part 33a screwed with the female screw part 32a penetrates; and a connection shaft 36 for connecting a space in the opening part. The adjustment nut 32 includes a pair of pinching pieces 38a, 38b for pinching the connection shaft 36, and out of the pair of pinching pieces 38a, 38b, the pinching piece 38a on the side coming into contact with the male screw part 33a is pressed in a direction for pinching the connections shaft 36 by the male screw part 33a.SELECTED DRAWING: Figure 5

Description

[Technical Field]

[0001] The present invention relates to a vehicle lamp. [Background technology]

[0002] Conventionally, vehicle lighting fixtures such as vehicle headlights (headlamps) have been provided with a lighting unit that emits light toward the front of the vehicle, located inside a lamp body composed of a housing with an opening at the front and an outer lens that covers the opening of the housing, and with an optical axis adjustment mechanism that adjusts the optical axis of the light emitted from this lighting unit toward the front of the vehicle (see, for example, Patent Document 1 below).

[0003] In vehicle lamps equipped with such optical axis adjustment mechanisms, the optical axis of the light emitted from the lamp unit toward the front of the vehicle is adjusted by an aiming operation that adjusts the left-right and up-down tilt of the lamp unit.

[0004] For example, Patent Document 1 listed below discloses a nut member having a fitting portion that fits into a fitting hole provided in an object, and a female thread portion into which a screw is inserted and which is screwed into the male thread portion of the screw, wherein the fitting portion and the female thread portion are formed at different axial positions of the nut member, the fitting portion has a pair of elastically deformable leg pieces that are arranged opposite each other in the radial direction of the female thread portion, and these leg pieces have fitting grooves on their outer radial surfaces that fit into the fitting hole, and each leg piece has a cavity in the inner region of the groove bottom of the fitting groove. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] Patent No. 6062178 Summary of the Invention [Problem to be solved by the invention]

[0006] In the invention described in the above-mentioned Patent Document 1, the fitting portion is composed of a pair of elastically deformable leg pieces, and fitting grooves are provided in these leg pieces, and a cavity is provided on the inside of the bottom surface of the fitting groove, so that the fitting portion elastically abuts against the fitting hole.

[0007] However, in the invention described in Patent Document 1, although the mating portion elastically abuts against the mating hole, which can absorb the rattle between the mating hole and the mating groove, the mating portion will become misaligned with respect to the mating hole due to the elastic deformation of the mating portion.

[0008] Therefore, in such a configuration, vibrations and the like while the vehicle is traveling may cause the support position of the light source unit by the optical axis adjustment mechanism to become unstable, or the optical axis adjustment by the optical axis adjustment mechanism may become misaligned.

[0009] The present invention has been proposed in consideration of the above-mentioned conventional circumstances, and aims to provide a vehicle lamp that can support a light source unit in a stable state and that enables the optical axis of the light source unit to be adjusted with high precision. [Means for solving the problem]

[0010] In order to achieve the above object, the present invention provides the following means. [1] A vehicle lamp having a light source unit disposed on the front side of a housing having an opening at the front, and an optical axis adjustment mechanism for adjusting the optical axis of light emitted from the light source unit toward the front of the vehicle, the optical axis adjustment mechanism includes a bracket that supports the light source unit and an aiming portion that adjusts the inclination of the bracket with respect to the housing, The aiming portion includes a mount ring provided on the bracket; an adjustment nut that is connected to the mount ring and supported so as to be slidable in the front-rear direction relative to the housing; an adjustment bolt including a male thread portion that is threadedly engaged with the female thread portion of the adjustment nut and that is supported rotatably about its axis relative to the housing; the mount ring has an opening through which a tip end side of the male screw portion threadedly engaged with the female screw portion passes, and a connecting shaft connecting the openings, The adjusting nut has a pair of clamping pieces that clamp the connecting shaft, The vehicle lamp is characterized in that one of the pair of clamping pieces that comes into contact with the male thread portion is pressed by the male thread portion in a direction in which the connecting shaft is clamped. [2] A pair of the connecting shafts are arranged parallel to each other on opposite sides of the male thread portion, The vehicle lamp according to [1], wherein the pair of clamping pieces are provided at respective positions where the connecting shaft is clamped. [3] The vehicle lamp according to [1], wherein the pair of clamping pieces have a groove portion that engages with the connecting shaft on the surface that clamps the connecting shaft. [4] The adjusting nut has a pair of hook pieces with claws on the tip side, The vehicle lamp described in [1] is characterized in that when the pair of hook pieces pass through the opening, the claw portion is engaged around the opening of the mount ring. [5] The vehicle lamp according to [4], wherein the adjustment nut has an abutment portion that abuts against the back side of the mount ring at a position where the claw portion engages around the periphery of the opening of the mount ring. [6] The vehicle lamp according to [1], characterized in that the inclination of the light source unit supported by the bracket is adjusted by rotating the adjustment bolt to slide the adjustment nut in the forward / backward direction. [7] The optical axis adjustment mechanism has three support points for supporting the bracket relative to the housing, and includes a fixed support part located at a first support point and supporting the bracket so as to be tiltable while fixing the position of the bracket relative to the housing, a first aiming part located at a second support point and adjusting the tilt of the bracket in the left-right direction relative to the housing, and a second aiming part located at a third support point and adjusting the tilt of the bracket in the up-down direction relative to the housing, The vehicle lamp according to [1], wherein at least one of the first aiming portion and the second aiming portion is configured by the aiming portion. [Effects of the Invention]

[0011] As described above, according to the present invention, a vehicle lamp is provided that can support a light source unit in a stable state and also enables the optical axis of the light source unit to be adjusted with high precision. [Brief explanation of the drawings]

[0012] [Figure 1] 1 is a front view showing a configuration of a vehicle lamp according to an embodiment of the present invention; [Figure 2] 2 is a cross-sectional view of the vehicle lamp taken along line AA shown in FIG. 1. [Figure 3] 2 is a perspective view showing the configuration of a light axis adjusting mechanism provided in the vehicle lamp shown in FIG. 1. FIG. [Figure 4] FIG. 4 is an exploded perspective view showing the configuration of the optical axis adjusting mechanism shown in FIG. [Figure 5] FIG. 4 is a vertical cross-sectional view showing the configuration of the optical axis adjusting mechanism shown in FIG. [Figure 6] FIG. 4 is a cross-sectional view showing the configuration of the optical axis adjusting mechanism shown in FIG. DETAILED DESCRIPTION OF THE INVENTION

[0013] Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. In the drawings used in the following description, the dimensions of the components may be shown at different scales to make them easier to see, and the dimensional ratios of the components may not necessarily be the same as in reality.

[0014] As one embodiment of the present invention, a vehicle lamp 1 equipped with a light axis adjusting mechanism 20 shown in, for example, FIGS. 1 to 5 will be described. FIG. 1 is a cross-sectional view showing the configuration of the vehicle lamp 1. FIG. 2 is a cross-sectional view of the vehicle lamp 1 taken along line AA shown in FIG. 1. FIG. 3 is a perspective view showing the configuration of the optical axis adjustment mechanism 20 provided in the vehicle lamp 1. FIG. 4 is an exploded perspective view showing the configuration of the optical axis adjustment mechanism 20. FIG. 5 is a vertical cross-sectional view showing the configuration of the optical axis adjustment mechanism 20. FIG. 6 is a horizontal cross-sectional view showing the configuration of the optical axis adjustment mechanism 20.

[0015] In addition, in the drawings shown below, an XYZ Cartesian coordinate system is set up, with the X-axis direction representing the front-to-rear direction (length direction) of the vehicle lighting fixture 1, the Y-axis direction representing the left-to-right direction (width direction) of the vehicle lighting fixture 1, and the Z-axis direction representing the up-to-down direction (height direction) of the vehicle lighting fixture 1.

[0016] The vehicle lamp 1 of this embodiment is an application of the present invention to a vehicle headlamp mounted on both corners on the front end side of a vehicle (not shown), for example.

[0017] Specifically, as shown in Figures 1 and 2, this vehicle lamp 1 has a structure in which a light source unit 4 that projects light toward the front of the vehicle (in the +X-axis direction) is arranged inside a lamp body 3 that is composed of a housing 2 that is open at the front and a transparent outer lens (not shown) that covers the opening of the housing 2.

[0018] The light source unit 4 includes, for example, a light source 5 that emits white light (hereinafter simply referred to as light) L, a reflector 6 that reflects the light L emitted upward from the light source 5 toward the front of the vehicle, a shade 7 that blocks (cuts) a portion of the light L reflected by the reflector 6, a projection lens 8 that projects the light L that has been cut by the shade 7 toward the front of the vehicle, a substrate 9 on one side (the top side in this embodiment) of which the light source 5 is mounted, and a heat sink 10 that dissipates heat emitted by the light source 5 while in contact with the other side (the bottom side in this embodiment) of the substrate 9.

[0019] In the light source unit 4, a low beam light distribution pattern including a cutoff line at the upper end is formed as a passing beam (low beam) by inverting and projecting the light source image defined by the front end of the shade 7 using the projection lens 8.

[0020] The light source unit 4 may be configured such that a cooling fan (not shown) is attached to the rear side of the light source unit 4. The light source 5 may be a light emitting element such as a light emitting diode (LED) or a laser diode (LD). Furthermore, the number of light emitting elements is not limited to one, and may be multiple.

[0021] In addition, the light source unit 4 may be configured such that another light source (not shown) is disposed below the shade 7 as a driving beam (high beam), and the light emitted from this light source is projected by the projection lens 8 in the direction of travel of the vehicle, thereby forming a high beam light distribution pattern above the low beam light distribution pattern.

[0022] The light source unit 4 is not necessarily limited to a projector-type light source unit that projects light L toward the front of the vehicle using the above-mentioned projection lens 8, but may be, for example, a reflector-type light source unit that omits the projection lens and projects light L toward the front of the vehicle using a reflector including multiple reflective surfaces, or a light-guiding lens-type light source unit that projects light L toward the front of the vehicle using a light-guiding lens.

[0023] As shown in FIGS. 1 and 2, the vehicle lamp 1 of this embodiment includes an optical axis adjustment mechanism 20 that adjusts the optical axis of light L emitted from the light source unit 4 toward the front of the vehicle.

[0024] The optical axis adjustment mechanism 20 includes an aiming bracket 21 that holds the light source unit 4, and this aiming bracket 21 is supported so as to be able to tilt freely relative to the housing 2 via a fixed support portion 22, a first aiming portion 23, and a second aiming portion 24.

[0025] Specifically, as shown in Figure 1, this optical axis adjustment mechanism 20 has three support points S1, S2, and S3 that support the aiming bracket 21 relative to the housing 2. Of these, a fixed support part 22 is located at the first support point S1 and supports the aiming bracket 21 so that it can tilt freely while fixing the position of the aiming bracket 21 relative to the housing 2, a first aiming part 23 is located at the second support point S2 and adjusts the left-right tilt of the aiming bracket 21 relative to the housing 2, and a second aiming part 24 is located at the third support point S3 and adjusts the up-down tilt of the aiming bracket 21 relative to the housing 2.

[0026] Furthermore, when the light source unit 4 is viewed from the front, the first support point S1 and the second support point S2 are located above the optical axis center O of the light source unit 4, and a line LH12 connecting the first support point S1 and the second support point S2 is parallel to a horizontal line LH passing through the optical axis center O. Furthermore, the third support point S3 is located below the optical axis center O of the light source unit 4, and a line LV23 connecting the second support point S1 and the third support point S3 is parallel to a vertical line LV passing through the optical axis center O. Furthermore, the optical axis center O of the light source unit 4 is located inside an area E surrounded by the first support point S1, the second support point S2, and the third support point S3. Note that the arrangement of the three support points S1, S2, and S3 is not limited to this arrangement and can be changed as appropriate.

[0027] In the vehicle lamp 1 equipped with the optical axis adjustment mechanism 20 of this embodiment, the optical axis of the light L emitted from the light source unit 4 toward the front of the vehicle can be adjusted by an aiming operation that adjusts the left-right tilt and up-down tilt of the light source unit 4.

[0028] That is, in the optical axis adjustment mechanism 20 of this embodiment, by rotating the adjuster of the first aiming portion 23, the first aiming portion 23 slides the second support point S2 of the aiming bracket 21 in the front-to-rear direction. At this time, the aiming bracket 21 swings left and right with the fixed support portion 22 (first support point S1) as the fulcrum. This makes it possible to adjust the tilt of the light source unit 4 in the left and right direction.

[0029] On the other hand, in the optical axis adjustment mechanism 20 of this embodiment, by rotating the adjuster of the second aiming portion 24, the second aiming portion 24 slides the third support point S3 of the aiming bracket 21 in the front-to-rear direction. At this time, the aiming bracket 21 swings up and down with the fixed support portion 22 (first support point S1) as the fulcrum. This makes it possible to adjust the tilt of the light source unit 4 in the up and down direction.

[0030] In addition, the optical axis adjustment mechanism 20 of this embodiment is configured to support the aiming bracket 21 that holds the above-mentioned light source unit 4 so that it can be tilted freely. However, for example, in a light source unit that includes a light source and a reflector that reflects light emitted from the light source and irradiates the light reflected by the reflector toward the front of the vehicle, the aiming bracket 21 attached to the back side of the reflector may be supported so that it can be tilted freely via the fixed support part 22, the first aiming part 23, and the second aiming part 24, thereby adjusting the optical axis of the light L irradiated from the light source unit 4 toward the front of the vehicle.

[0031] In the optical axis adjustment mechanism 20 of this embodiment, at least one of the first aiming section 23 and the second aiming section 24 (in this embodiment, the second aiming section 24) is configured by an aiming section 30 to which the present invention is applied.

[0032] Specifically, as shown in Figures 3 to 6, the aiming portion 30 has a mount ring 31 provided on the aiming bracket 21, an adjustment nut 32 that is connected to the mount ring 31 and supported so as to be freely slidable in the forward and backward directions relative to the housing 2, and an adjustment bolt 33 that includes a male thread portion 33a that threads into the female thread portion 32a of the adjustment nut 32 and is supported so as to be freely rotatable around its axis relative to the housing 2.

[0033] 4, the mount ring 31 is provided to protrude downward from the outer periphery of the aiming bracket 21. The mount ring 31 has a rectangular frame portion 34, a rectangular opening portion 35 that forms the inside of the frame portion 34, and a pair of upper and lower connecting shafts 36 that connect the opening portions 35 of the frame portion 34.

[0034] The pair of connecting shafts 36 connect the two sides of the frame portion 34 that sandwich the opening 35 in the left-right direction. The pair of connecting shafts 36 are arranged parallel to each other and aligned in the up-down direction. Each connecting shaft 36 is formed, for example, in the shape of a hexagonal prism. Note that the shape of the connecting shafts 36 is not limited to the above-mentioned hexagonal prism, and may be a square prism, a cylindrical shape, or the like, and the shape can be changed as appropriate.

[0035] The adjusting nut 32 is made of a resin molded body made of synthetic resin with excellent wear resistance, and has a substantially cylindrical nut body 32b on which a female thread portion 32a is formed, and a base portion 32c located below the nut body 32b and supporting the nut body 32b. The adjusting nut 32 is supported on the housing 2 so as to be slidable in the front-to-rear direction with respect to the housing 2, with the base portion 32c engaged with a slide groove 37 provided in the housing 2.

[0036] The adjusting nut 32 has a pair of upper and lower clamping pieces 38a, 38b that sandwich the connecting shaft 36. Two pairs of clamping pieces 38a, 38b are provided corresponding to each of the pair of upper and lower connecting shafts 36. That is, the pair of clamping pieces 38a, 38b are located above and below the female thread portion 32a on the front side of the nut body 32b, and each protrudes forward.

[0037] The pair of clamping pieces 38a, 38b have a groove 39 extending in the left-right direction on the surface that sandwiches the connecting shaft 36. The groove 39 is provided between a pair of front and rear protrusions 39a that protrude from the surface that sandwiches the connecting shaft 36. The groove 39 has a concave shape between the pair of protrusions 39a that matches the outer shape of the connecting shaft 36, in accordance with the shape of the connecting shaft 36 described above, i.e., the hexagonal column shape.

[0038] 3 and 5, the adjusting nut 32 is connected to the mount ring 31 with the upper pair of clamping pieces 38a, 38b sandwiching the upper connecting shaft 36 and the lower pair of clamping pieces 38a, 38b sandwiching the lower connecting shaft 36. Furthermore, by engaging the connecting shaft 36 with the groove portion 39, the connecting shaft 36 can be firmly sandwiched between the pair of clamping pieces 38a, 38b.

[0039] As shown in Figure 4, the adjustment nut 32 has a pair of left and right hook pieces 40 with claw portions 40a at the tip end, and a pair of left and right abutment portions 41 located outside the pair of hook pieces 40.

[0040] The pair of hook pieces 40 are located on the left and right sides of the female thread portion 32a on the front side of the nut body 32b, and each protrudes forward. The claw portions 40a protrude outward from the tip ends of the pair of hook pieces 40 in opposite directions to each other.

[0041] The pair of contact portions 41 are made up of protrusions that protrude forward along the outer surfaces of the pair of hook pieces 40 on the front side of the nut body 32b, and have flat contact surfaces 41a at their tips.

[0042] 3 and 6, the pair of hook pieces 40 penetrates the opening 35 of the mount ring 31, specifically between the pair of upper and lower connecting shafts 36, and the claw portions 40a are locked to the frame portion 34 of the mount ring 31 when the pair of clamping pieces 38a, 38b are positioned to clamp the connecting shaft 36. Furthermore, when the claw portions 40a are locked to the frame portion 34, the back side of the frame portion 34 of the mount ring 31 is in contact with the contact surface 41a of the contact portion 41. This positions the mount ring 31 and the adjusting nut 32 in the front-to-rear, up-down, and left-to-right directions.

[0043] As shown in Fig. 3, the adjustment bolt 33 is made of a resin molded body made of synthetic resin with excellent wear resistance and is formed into an elongated shaft shape as a whole. The adjustment bolt 33 has a screw shaft 33b with a male thread portion 33a formed therein and an adjustment dial 33c serving as an adjuster at the rear end of the screw shaft 33b. The adjustment bolt 33 is supported by the housing 2 so as to be rotatable about its axis, with the rear end of the screw shaft 33b engaged with a shaft hole 42 provided in the housing 2.

[0044] In the aiming unit 30, the adjustment bolt 33 rotates around its axis by rotating the adjustment dial 33c located on the back side of the housing 2. When the adjustment bolt 33 rotates, the adjustment nut 32 slides in the front-to-rear direction due to the engagement between the male thread portion 33a and the female thread portion 32a. Depending on the direction of rotation of the adjustment dial 33c, the adjustment bolt 33 can be advanced or retreated.

[0045] As a result, in the aiming section 30, the aiming bracket 21 is swung by sliding the adjustment nut 32 connected to the mount ring 31 in the forward and backward directions, and the inclination of the light source unit 4 supported by this aiming bracket 21 is adjusted.

[0046] As shown in FIG. 5, in the aiming section 30, of the pair of clamping pieces 38a, 38b that clamp the connecting shaft 36, the clamping piece 38a that comes into contact with the male threaded portion 33a is pressed in the direction of clamping the connecting shaft 36 by the male threaded portion 33a of the adjustment bolt 33.

[0047] That is, the clamping pieces 38a on the side that comes into contact with the male thread portion 33a are positioned on both the upper and lower sides of the male thread portion 33a of the adjustment bolt 33, and are pressed in the direction of clamping each connecting shaft 36.

[0048] This results in the connecting shaft 36 being firmly clamped between the pair of clamping pieces 38a, 38b, which prevents any play in the connection between the mount ring 31 and the adjusting nut 32 and makes it possible to prevent misalignment in the front-to-back, up-down, and left-to-right directions between the mount ring 31 and the adjusting nut 32.

[0049] Therefore, in the vehicle lamp 1 of this embodiment, the light source unit 4 held by the aiming bracket 21 can be supported in a stable state without being affected by vibrations etc. when the vehicle is traveling, and further, the optical axis of the light source unit 4 can be adjusted with high precision by the aiming portion 30 of the optical axis adjustment mechanism 20 described above.

[0050] The present invention is not necessarily limited to the above-described embodiment, and various modifications can be made without departing from the spirit of the present invention.

[0051] For example, the above-mentioned vehicle lamp 1 illustrates an example in which the configuration of the aiming section 30 of the present invention is applied to the second aiming section 24 described above, but the configuration of the aiming section 30 of the present invention may also be applied to the first aiming section 23, and it is also possible to apply the configuration of the aiming section 30 of the present invention to each of the first and second aiming sections 23, 24.

[0052] Furthermore, in the aiming section 30, a pair of upper and lower connecting shafts 36 are provided on the mount ring 31, but a configuration in which a pair of left and right connecting shafts 36 are provided and a pair of clamping pieces 38a, 38b provided corresponding to each of the pair of left and right connecting shafts 36 clamp each connecting shaft 36. Furthermore, when a pair of left and right connecting shafts 36 are provided, a configuration in which a pair of upper and lower hook pieces 40 and abutment portions 41 are provided may be used. [Explanation of symbols]

[0053] REFERENCE SIGNS LIST 1...vehicle lamp 2...housing 3...lamp body 4...light source unit 5...light source 6...reflector 7...shade 8...projection lens 9...board 10...heat sink 20...optical axis adjustment mechanism 21...aiming bracket 22...fixed support portion 23...first aiming portion 24...second aiming portion 30...aiming portion 31...mount ring 32...adjusting nut 32a...female thread portion 33...adjusting bolt 33a...male thread portion 34...frame portion 35...opening 36...connecting shaft 38a, 38b...pair of clamping pieces 39...groove portion 40...hook piece 40a...claw portion 41...contact portion 41a...contact surface L...optical axis

Claims

1. A vehicle lamp having a light source unit disposed on the front side of a housing having an open front surface, and an optical axis adjustment mechanism for adjusting the optical axis of light emitted from the light source unit toward the front of the vehicle, the optical axis adjustment mechanism includes a bracket that supports the light source unit and an aiming portion that adjusts the inclination of the bracket with respect to the housing, The aiming portion includes a mount ring provided on the bracket; an adjustment nut that is connected to the mount ring and supported so as to be slidable in the front-rear direction relative to the housing; an adjustment bolt including a male thread portion that is threadedly engaged with the female thread portion of the adjustment nut and that is supported rotatably about its axis relative to the housing; the mount ring has an opening through which a tip end side of the male screw portion threadedly engaged with the female screw portion passes, and a connecting shaft connecting the openings, The adjusting nut has a pair of clamping pieces that clamp the connecting shaft, The vehicle lamp is characterized in that one of the pair of clamping pieces that comes into contact with the male thread portion is pressed by the male thread portion in a direction in which the connecting shaft is clamped.

2. The connecting shafts are arranged in a pair parallel to each other on opposite sides of the male thread portion, 2. The vehicle lamp according to claim 1, wherein the pair of clamping pieces are provided at positions where the connecting shaft is clamped.

3. 2. The vehicle lamp according to claim 1, wherein the pair of clamping pieces have grooves that engage with the connecting shaft on surfaces that clamp the connecting shaft.

4. The adjusting nut has a pair of hook pieces with claws at the tip end thereof, 2. The vehicle lamp according to claim 1, wherein the claw portions are engaged with the periphery of the opening of the mount ring when the pair of hook pieces pass through the opening.

5. 5. The vehicle lamp according to claim 4, wherein the adjustment nut has an abutment portion that abuts against the back side of the mount ring at a position where the claw portion is engaged around the periphery of the opening of the mount ring.

6. 2. The vehicle lamp according to claim 1, wherein the adjustment nut slides in the front-rear direction by rotating the adjustment bolt, thereby adjusting the inclination of the light source unit supported by the bracket.

7. the optical axis adjustment mechanism has three support points for supporting the bracket on the housing, and includes a fixed support part located at a first support point and supporting the bracket so as to be tiltable while fixing the position of the bracket with respect to the housing, a first aiming part located at a second support point and adjusting the tilt of the bracket in the left-right direction with respect to the housing, and a second aiming part located at a third support point and adjusting the tilt of the bracket in the up-down direction with respect to the housing, 2. The vehicle lamp according to claim 1, wherein at least one of the first aiming portion and the second aiming portion is formed by the aiming portion.

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