JP2012059367A - Condenser lens - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a condenser lens capable of positioning and supporting precisely to a prescribed position while maintaining an excellent condensing efficiency.SOLUTION: The condenser lens 11A has a supporting flange part 21 at a lens part 20 to condense light from a light source 14. The lens part 20 has a condensing section 23 having a curvature to guide the light from the light source 14 to a using optical path range A in a prescribed direction and a non-condensing section 24 consisting of a portion other than the condensing section 23. The flange part 21 is molded integrally around the non-condensing section 24.

Description

  The present invention relates to a condensing lens provided in a backlight or the like of a liquid crystal display.

  In recent years, along with the increase and diversification of information required by the driver during driving, especially information with high urgency is displayed on the windshield of the vehicle as a virtual image, and the vehicle foreground can be seen through it. A head-up display (HUD) device is mounted on a vehicle such as an automobile or a train.

  As such a head-up display device, the light from the backlight is projected onto the liquid crystal panel, and the image displayed on the liquid crystal panel is irradiated and reflected on the display area of the windshield of the automobile, so that the image is displayed to the driver of the automobile. There is something that makes you see the virtual image. The backlight has a structure in which light from a light source is condensed onto a diffusion plate by a condensing lens that is partly accommodated and held in a recess of a support member (see, for example, Patent Document 1).

JP 2010-39386 A

  By the way, as a condensing lens provided in the backlight of a liquid crystal display as described above, it is required to efficiently condense light from a light source such as an LED. For this purpose, it is necessary to accurately position and support the condensing lens. However, when the condensing lens is fitted and accommodated in the support member as described above, the support member transmits the light from the light source to the liquid crystal display. As a result, a part of the used optical path, which is the optical path leading to, is blocked, and the range of the used optical path becomes narrow. As a result, there is a problem in that the light collection efficiency of the condenser lens is lowered, and the brightness of the display image is lowered.

  The present invention has been made in view of the above-described circumstances, and an object thereof is to provide a condensing lens that can be accurately positioned and supported at a predetermined position while maintaining good condensing efficiency. There is.

In order to achieve the above-described object, the condenser lens according to the present invention is characterized by the following (1) or (2).
(1) A condensing lens in which a supporting flange portion is provided on a lens portion that condenses light from a light source,
The lens unit includes a condensing unit having a curved surface that guides light from the light source to a use optical path range in a predetermined direction, and a non-condensing unit composed of a portion other than the condensing unit,
The flange portion is integrally formed around the non-light collecting portion.
(2) In the condensing lens having the configuration of (1), the lens portion has a planar light incident surface on which light from the light source is incident protrudes toward the light source from the flange portion. thing.

In the condensing lens having the configuration (1), the flange portion for positioning and supporting the lens portion is a portion around the non-condensing portion that is a portion other than the condensing portion that guides light from the light source to the use optical path range. The light from the light source to the light collecting portion is not blocked by the flange portion. Thereby, the light from the light source can be condensed with high efficiency and high brightness into the use optical path range by the lens unit.
In the condensing lens having the configuration (2), since the planar light incident surface of the lens portion protrudes toward the light source side from the flange portion, only the light incident surface that needs to be polished can be easily obtained by the polishing apparatus. Polishing is possible, and processing costs can be reduced.

  ADVANTAGE OF THE INVENTION According to this invention, the condensing lens which can be correctly positioned and supported to a predetermined position can be provided, maintaining favorable condensing efficiency.

  The present invention has been briefly described above. Further, details of the present invention will be further clarified by reading through the modes for carrying out the invention described below with reference to the accompanying drawings.

1 is a schematic side view of an image forming apparatus including a condenser lens according to a first embodiment. It is a perspective view of a condensing lens concerning a 1st embodiment. It is a perspective view explaining the lens part of the condensing lens which concerns on 1st Embodiment. It is sectional drawing explaining the optical path in the lens part of the condensing lens which concerns on 1st Embodiment. It is sectional drawing explaining the optical path of the condensing lens which concerns on 1st Embodiment. It is a perspective view of the condensing lens which concerns on 2nd Embodiment. It is a perspective view explaining the lens part of the condensing lens which concerns on 2nd Embodiment. It is a schematic plan view explaining the surface light source in the condensing lens provided with the several lens part. It is a schematic plan view explaining the surface light source in the condensing lens concerning 2nd Embodiment. It is sectional drawing explaining the optical path of the condensing lens which concerns on 3rd Embodiment. It is a partial expanded sectional view of the condensing lens which concerns on 3rd Embodiment. It is sectional drawing explaining the condensing lens which concerns on 4th Embodiment. It is sectional drawing explaining the optical path of the condensing lens which concerns on 5th Embodiment. It is sectional drawing explaining the condensing lens which concerns on 6th Embodiment. It is a top view by the side of the light source of the condensing lens concerning 6th Embodiment. It is a top view by the side of the light source of the condensing lens concerning 6th Embodiment.

  Hereinafter, an example of an embodiment according to the present invention will be described with reference to the drawings.

(First embodiment)

  First, the condenser lens according to the first embodiment will be described.

  1 is a schematic side view of an image forming apparatus including a condenser lens according to the first embodiment, FIG. 2 is a perspective view of the condenser lens according to the first embodiment, and FIG. 3 is a condenser according to the first embodiment. FIG. 4 is a cross-sectional view for explaining the optical path in the lens portion of the condenser lens according to the first embodiment, and FIG. 5 is for explaining the optical path of the condenser lens according to the first embodiment. It is sectional drawing.

  As shown in FIG. 1, the condenser lens 11 </ b> A according to the present embodiment is provided in a backlight 13 of an image forming apparatus 12 that constitutes a head-up display (HUD) device installed in a vehicle.

  The backlight 13 includes a light source 14, and the light source 14 irradiates light toward the condenser lens 11A. The light irradiated to the condensing lens 11A is condensed by the condensing lens 11A and guided to the side opposite to the light source 14.

  The light source 14 is made of a light emitting diode (LED), and is mounted on a substrate 15 made of aluminum or the like having excellent heat conductivity. The substrate 15 on which the light source 14 is mounted is fixed to a heat sink 17 formed of aluminum or the like having a plurality of fins 17a via a heat transfer sheet 16, and thereby the heat generated by the light source 14 is The heat is transmitted to the substrate 15 to be dissipated, and is transmitted to the heat sink 17 to be dissipated.

  A diffusion plate 18 and a liquid crystal display (LCD) 19 are provided in this order on the opposite side of the condenser lens 11 </ b> A in the backlight 13 having the above configuration from the light source 14.

  The light emitted from the condensing lens 11A is diffused by the diffusion plate 18, and is guided to the liquid crystal display 19 as a surface light source in which luminance unevenness is suppressed and viewing angle characteristics are improved.

  The liquid crystal display 19 is a display that forms a virtual image composed of display information such as an image displayed on the windshield of the vehicle, and light irradiated to the liquid crystal display 19 through the diffusion plate 18 is displayed as display light by the liquid crystal display 19. Guided to windshield projection area. The display information includes arbitrary data such as image data, guidance data, and index data.

  As shown in FIG. 2, the condensing lens 11 </ b> A has a lens unit 20 that collects light by collecting and refracting light from the light source 14, and the lens unit 20 irradiates with a certain degree of spread. The light from the light source 14 is guided to the image forming apparatus 12 side as a surface light source.

  The condensing lens 11A is formed of, for example, a high refractive index material such as glass or resin, and a flange portion 21 is integrally formed on the lens portion 20 and provided.

  The surface of the condensing lens 11 </ b> A on the light source 14 side is a light incident surface 22 formed in a flat shape, and light from the light source 14 is guided from the light incident surface 22 into the lens unit 20.

  Mounting holes 21a are formed in the flange portion 21 provided in the lens portion 20, and fixing bolts (not shown) are inserted into these mounting holes 21a to be fixed and supported on the frame or the like of the head-up display device. Can be done.

  The lens unit 20 is formed with a hemispherical condensing unit 23 having a lens surface 23 a having a curved surface formed of a hemispherical surface, and other than the hemispherical condensing unit 23 is a non-condensing unit 24. ing. A flange portion 21 is integrally formed around the non-light condensing portion 24 of the lens portion 20.

  The lens unit 20 is a polished surface so that the light incident surface 22 on the light source 14 side and the lens surface 23a of the light condensing unit 23 are polished and light is collected and refracted.

  Here, in the lens unit 20 of the condensing lens 11A, only the light reaching the condensing unit 23 is emitted as a necessary light L1 from a lens surface 23a formed in a curved surface formed of a hemispherical surface of the condensing unit 23. , Guided toward the diffusion plate 18. The range of light emitted from the lens surface 23a of the light condensing unit 23 is a use optical path range A.

  Therefore, since the light from the light source 14 that does not reach the light condensing unit 23 is unnecessary light, it is necessary not to be guided to the use optical path range A.

  For example, as shown in FIG. 3 and FIG. 4, when the non-condensing part 24 is formed in a cylindrical shape without forming the flange part 21 around the non-condensing part 24 of the lens unit 20, the condensing part 23. A part of the unnecessary light L2 from the light source 14 that does not reach is reflected by the inner peripheral surface of the non-light condensing part 24 and totally reflected a plurality of times by the inner surface of the light converging part 23, and upwards outside the use optical path range A. Without being emitted, the luminance is gradually weakened and guided to the light incident surface 22 side. Therefore, the unnecessary light L2 that does not reach the condensing unit 23 does not affect the image display. In order to totally reflect the unnecessary light L2 reflected by the inner peripheral surface of the non-condensing unit 24 on the inner surface of the condensing unit 23, based on the emission angle of light from the light source 14, the light intensity of the light source 14, and the like. It is necessary to set the distance between the light incident surface 22 of the lens 20 and the light source 14.

  On the other hand, when the flange portion 21 is formed around the non-condensing portion 24, a light source that does not reach the condensing portion 23, unlike the case where the non-condensing portion 24 is formed in a cylindrical shape as shown in FIG. Part of the unnecessary light L <b> 2 from 14 is guided into the flange portion 21 from the non-light collecting portion 24.

  However, the unnecessary light L <b> 2 guided into the flange portion 21 is emitted outside from the upper surface of the flange portion 21 without being emitted upward outside the use optical path range A. Therefore, the unnecessary light L2 guided into the flange portion 21 does not affect the image display.

  If the condenser lens 11A is used in the backlight 13 of the image forming apparatus 12, the lens portion 20 can be accurately positioned and supported by fixing the flange portion 21 of the condenser lens 11A to a frame or the like. Therefore, the light from the light source 14 composed of the LED as the point light source can be condensed on the use optical path range A and guided to the liquid crystal display 19 through the diffusion plate 18.

  Further, a flange portion 21 for positioning and supporting the lens portion 20 is integrally formed around a non-light collecting portion 24 that is a portion other than the light collecting portion 23 that guides the light from the light source 14 to the use optical path range A. Therefore, the required light L <b> 1 from the light source 14 to the light collecting unit 23 is not blocked by the flange portion 21. That is, extremely high light collection efficiency can be obtained, and a display image can be displayed with high luminance.

  Next, a condenser lens according to another embodiment will be described.

  In addition, the same structure part as 11 A of condensing lenses which concern on said 1st Embodiment attaches | subjects the same code | symbol, and abbreviate | omits description.

(Second Embodiment)

  FIG. 6 is a perspective view of a condenser lens according to the second embodiment, FIG. 7 is a perspective view illustrating a lens portion of the condenser lens according to the second embodiment, and FIG. 8 is a condenser lens including a plurality of lens portions. FIG. 9 is a schematic plan view for explaining the surface light source in the condenser lens according to the second embodiment.

  As shown in FIG. 6, the condenser lens 11 </ b> B includes a plurality (two in this example) of lens units 20.

  As shown also in FIG. 7, these lens parts 20 are integrally molded by overlapping a part thereof in the plane direction.

  And the flange part 21 is integrally shape | molded around the non-light-condensing part 24 of the some lens part 20 overlapped and integrated in this way.

  Here, as shown in FIG. 8, if the lens units 20 are integrated so as not to overlap each other in the plane direction, the lens units 20 are located between the lens units 20 with respect to the surface light source region B required on the image forming apparatus 12 side. As a result, a low luminance region C in which the luminance decreases is generated.

  On the other hand, as described above, when a part of the lens unit 20 is overlapped and integrated in the plane direction, as shown in FIG. 9, in the surface light source region B necessary on the image forming apparatus 12 side, the low luminance region It is possible to eliminate the problem that C occurs.

  Thus, also in the case of the condensing lens 11B having the plurality of lens portions 20, the flange portion 21 for positioning and supporting the lens portion 20 is used, and the necessary light L1 from the light source 14 is used in the optical path range A. Since it is integrally formed around the non-light-collecting part 24 that is a part other than the light-condensing part 23 leading to the display part, the necessary light L1 from the light source 14 to the light-condensing part 23 is not blocked by the flange part 21, and the display image is displayed. Can be displayed with high brightness.

  In particular, the condensing lens 11B includes a plurality of lens portions 20, and a part of these lens portions 20 is integrated by being overlapped in the plane direction, and thus can be reduced in size in the plane direction. Therefore, the light sources 14 can be packed and arranged to reduce the overall size of the backlight 13, and the number of the light sources 14 can be reduced.

(Third embodiment)

  FIG. 10 is a cross-sectional view illustrating the optical path of the condenser lens according to the third embodiment, and FIG. 11 is an enlarged cross-sectional view of a part of the condenser lens according to the third embodiment.

  As shown in FIG. 10, the condensing lens 11 </ b> C is formed by integrally molding a flange portion 21 having a thickness smaller than the height of the non-condensing portion 24.

  The flange portion 21 is shaped so that the surface on the light source 14 side is flush with the light incident surface 22 of the lens portion 20.

  And in the condensing lens 11C, since the thickness dimension of the flange part 21 is smaller than the height dimension of the non-condensing part 24, as for the non-condensing part 24, the condensing part 23 side is formed in the column shape. .

  Therefore, in the condensing lens 11 </ b> C, a part of the unnecessary light L <b> 2 from the light source 14 that does not reach the condensing part 23 is incident on the flange part 21 and on the inner peripheral surface of the cylindrical part 24 a of the non-condensing part 24. reflect.

  The unnecessary light L2 that has entered the flange portion 21 is emitted from the upper surface of the flange portion 21 to the outside without being emitted upward outside the optical path range A used. Further, the unnecessary light L2 reflected by the inner peripheral surface of the cylindrical portion 24a of the non-condensing part 24 is totally reflected a plurality of times on the inner surface of the condensing part 23, and is not emitted upward outside the use optical path range A. The luminance is gradually reduced and guided to the light incident surface 22 side.

  That is, in the condensing lens 11C, not only the unnecessary light L2 incident on the flange portion 21 but also the unnecessary light L2 reflected by the inner peripheral surface of the cylindrical portion 24a of the non-condensing portion 24 does not affect the image display. .

  In addition, as shown in FIG. 11, the cylindrical portion 24a of the non-condensing part 24 of the lens unit 20 has an inclination angle α in a sectional view so as to be gradually narrowed from the flange part 21 side toward the condensing part 23 side. A draft angle is provided.

  Accordingly, when the condensing lens 11C is molded with a mold, the mold can be easily removed from the mold.

  Note that the inclination angle α of the cylindrical portion 24a of the non-condensing portion 24 is such that the incident light angle θ is equal to or greater than the critical angle in order to totally reflect the unnecessary light L2 from the light source 14 on the inner peripheral surface of the cylindrical portion 24a. It is necessary to set so that it may restrict | limit so that the unnecessary light L2 from the light source 14 may be radiate | emitted outside, and may be guide | induced upwards other than the use optical path range A.

  Further, in the case of the condensing lens 11C in which the flange portion 21 having a thickness dimension smaller than the height dimension of the non-condensing portion 24 is integrally formed as described above, a flange for positioning and supporting the lens portion 20 is also provided. Since the unit 21 is integrally formed around the non-condensing unit 24 other than the condensing unit 23 that guides the necessary light L1 from the light source 14 to the use optical path range A, the light from the light source 14 to the condensing unit 23 The display image can be displayed with high brightness without blocking the necessary light L1 by the flange portion 21.

(Fourth embodiment)

  FIG. 12 is a cross-sectional view for explaining a condensing lens according to the fourth embodiment.

  As shown in FIG. 12, the condensing lens 11D includes a plurality of (two in this example) lens portions 20, and a part of these lens portions 20 is overlapped in the plane direction and formed integrally. Yes.

  Similarly to the condensing lens 11 </ b> C according to the third embodiment, the condensing lens 11 </ b> D is integrally formed with the flange portion 21 having a thickness smaller than the height of the non-condensing portion 24. A cylindrical portion 24 a is formed, and the surface on the light source 14 side of the flange portion 21 is formed to be flush with the light incident surface 22 of the lens portion 20.

  Therefore, also in the case of the condensing lens 11 </ b> D, a part of the unnecessary light L <b> 2 from the light source 14 that does not reach the condensing part 23 enters the flange part 21 and the inner periphery of the cylindrical part 24 a of the non-condensing part 24. Reflect on the surface. The light incident on the flange portion 21 is emitted from the upper surface of the flange portion 21 to the outside without being emitted upward outside the use optical path range A. Further, the unnecessary light L2 reflected by the inner peripheral surface of the cylindrical portion 24a of the non-condensing part 24 is totally reflected a plurality of times on the inner surface of the condensing part 23, and is not emitted upward outside the use optical path range A. The luminance is gradually reduced and guided to the light incident surface 22 side. That is, not only the unnecessary light L2 incident on the flange portion 21 but also the unnecessary light L2 reflected by the inner peripheral surface of the cylindrical portion 24a of the non-light-collecting portion 24 does not affect the image display.

  Also in the case of the condensing lens 11D, the flange portion 21 for positioning and supporting the lens portion 20 is a portion other than the condensing portion 23 that guides the necessary light L1 from the light source 14 to the use optical path range A. Since it is integrally formed around the condensing unit 24, the display image can be displayed with high luminance without blocking the light from the light source 14 to the condensing unit 23 by the flange unit 21.

  Further, the condensing lens 11D also includes a plurality of lens portions 20, and a part of these lens portions 20 is integrated by being overlapped in the plane direction, and thus can be reduced in size in the plane direction. Therefore, the light sources 14 can be packed and arranged to reduce the overall size of the backlight 13, and the number of the light sources 14 can be reduced.

(Fifth embodiment)

  FIG. 13 is a cross-sectional view for explaining the optical path of the condenser lens according to the fifth embodiment.

  As shown in FIG. 13, the condensing lens 11E is also integrally formed with a flange portion 21 having a thickness smaller than the height of the non-condensing portion 24, as in the condensing lens 11C according to the third embodiment. Thus, a cylindrical portion 24 a is formed in the non-light condensing portion 24.

  In the condensing lens 11E, the flange portion 21 is formed on the light condensing portion 23 side in the non-light condensing portion 24, whereby the light incident surface 22 of the lens portion 20 protrudes toward the light source 14 side from the flange portion 21. Has been.

  And also in the case of the condensing lens 11E, some unnecessary light L2 from the light source 14 which does not reach the condensing part 23 injects into the flange part 21, and the inner periphery of the cylindrical part 24a of the non-condensing part 24 Reflect on the surface. The unnecessary light L2 that has entered the flange portion 21 is emitted from the upper surface of the flange portion 21 to the outside without being emitted upward outside the optical path range A used. Further, the unnecessary light L2 reflected by the inner peripheral surface of the cylindrical portion 24a of the non-condensing part 24 is totally reflected a plurality of times on the inner surface of the condensing part 23, and is not emitted upward outside the use optical path range A. The luminance is gradually reduced and guided to the light incident surface 22 side. That is, not only the unnecessary light L2 incident on the flange portion 21 but also the unnecessary light L2 reflected by the inner peripheral surface of the cylindrical portion 24a of the non-light-collecting portion 24 does not affect the image display.

  Also in the case of the condensing lens 11E, the flange portion 21 for positioning and supporting the lens portion 20 is a portion other than the condensing portion 23 that guides the necessary light L1 from the light source 14 to the use optical path range A. Since it is integrally formed around the condensing unit 24, the display image can be displayed with high luminance without blocking the light from the light source 14 to the condensing unit 23 by the flange unit 21.

  As described above, in the lens unit 22, not only the lens surface 23a of the condensing unit 23 but also the light incident surface 22 is polished by using a polishing apparatus for good light collection and refraction. It is necessary to polish.

  For this reason, if the surface of the flange portion 21 on the light source 14 side is the same plane as the light incident surface 22, not only the light incident surface 22 but also the surface of the flange portion 21 on the light source 14 side that does not require polishing is affected by the polishing apparatus. Polishing processing is performed, and processing costs increase.

  However, in the condensing lens 11E described above, the flange portion 21 is formed on the light condensing portion 23 side in the non-light condensing portion 24, and the light incident surface 22 of the lens portion 20 protrudes toward the light source 14 side from the flange portion 21. Therefore, only the light incident surface 22 that needs to be polished can be polished by the polishing apparatus, and processing costs can be reduced by eliminating processing waste.

(Sixth embodiment)

  14 is a cross-sectional view illustrating a condenser lens according to the sixth embodiment, FIG. 15 is a plan view of the light source side of the condenser lens according to the sixth embodiment, and FIG. 16 is a diagram of the condenser lens according to the sixth embodiment. It is a top view by the side of a light source.

  As shown in FIG. 14, the condensing lens 11 </ b> F includes a plurality (two in this example) of lens portions 20, and a part of these lens portions 20 is overlapped in the plane direction and formed integrally. Yes.

  Similarly to the condensing lens 11E according to the fifth embodiment, the condensing lens 11F is also integrally formed with the flange portion 21 having a thickness smaller than the height of the non-condensing portion 24. A cylindrical portion 24 a is formed, and the flange portion 21 is further formed on the light collecting portion 23 side in the non-light collecting portion 24 so that the light incident surface 22 of the lens portion 20 protrudes toward the light source 14 side from the flange portion 21. ing.

  And also in the case of the condensing lens 11F, some unnecessary light L2 from the light source 14 which does not reach the condensing part 23 injects into the flange part 21, and the inner periphery of the cylindrical part 24a of the non-condensing part 24 Reflect on the surface. The unnecessary light L2 that has entered the flange portion 21 is emitted from the upper surface of the flange portion 21 to the outside without being emitted upward outside the optical path range A used. Further, the unnecessary light L2 reflected by the inner peripheral surface of the cylindrical portion 24a of the non-condensing part 24 is totally reflected a plurality of times on the inner surface of the condensing part 23, and is not emitted upward outside the use optical path range A. The luminance is gradually reduced and guided to the light incident surface 22 side. That is, not only the unnecessary light L2 incident on the flange portion 21 but also the unnecessary light L2 reflected by the inner peripheral surface of the cylindrical portion 24a of the non-light-collecting portion 24 does not affect the image display.

  Also in the case of the condensing lens 11F, the flange portion 21 for positioning and supporting the lens portion 20 is a portion other than the condensing portion 23 that guides the necessary light L1 from the light source 14 to the use optical path range A. Since it is integrally formed around the condensing unit 24, the display image can be displayed with high luminance without blocking the light from the light source 14 to the condensing unit 23 by the flange unit 21.

  Further, the condensing lens 11F also includes a plurality of lens units 20, and a part of these lens units 20 is integrated by being overlapped in the plane direction, and thus can be reduced in size in the plane direction. Therefore, the light sources 14 can be packed and arranged to reduce the overall size of the backlight 13, and the number of the light sources 14 can be reduced.

  Furthermore, also in the case of the condensing lens 11F, the flange part 21 is shape | molded by the condensing part 23 side in the non-condensing part 24, and the light-incidence surface 22 of the lens part 20 protrudes to the light source 14 side rather than the flange part 21. Therefore, only the light incident surface 22 that needs to be polished can be polished by the polishing apparatus, and processing costs can be reduced by eliminating processing waste.

  Here, in the condensing lens 11F, as shown in FIG. 15, since the circular light incident surfaces 22 of the plurality of lens portions 20 protruding toward the light source 14 are partially overlapped, a constricted portion 22a is formed. The

  Therefore, it is preferable that the shape of the lens portion 20 protruding to the light source 14 side of the condensing lens 11F is a simple oval shape as shown in FIG. If it does in this way, the cost reduction by simplification of the shape of the metal mold | die for shaping | molding and improvement of workability can be aimed at.

  Thus, even if the constricted portion 22a is eliminated and the oval shape is formed, the entire area of the light incident surface 22 is increased as compared with the case of the gourd shape having the constricted portion 22a. Therefore, the constricted portion 22a is eliminated and the oval shape is obtained. However, the amount of light applied to the surface light source region B does not decrease.

  In the condensing lenses 11B, 11D, and 11F according to the second, fourth, and sixth embodiments, the two lens units 20 are integrated, but three or more (for example, 24) lens units 20 are integrated. Of course it is good. In this case, the lens part 20 can be arrange | positioned at a grid | lattice form or zigzag form.

  In the above embodiment, the flange portion 21 may be formed from black resin by two-color molding. In this way, reflection or transmission of unnecessary light L2 guided to the flange portion 21 can be prevented. it can.

  Furthermore, it is preferable to prevent the unnecessary light L2 from being transmitted by painting the surfaces of the non-light-collecting portion 24 and the flange portion 21 where the unnecessary light L2 is emitted to the outside with a dark color such as black or by attaching an opaque cover. Further, the surface of the non-light-collecting portion 24 and the flange portion 21 from which the unnecessary light L2 is emitted to the outside may be roughened so that the unnecessary light L2 that is transmitted may be scattered light.

  In addition, this invention is not limited to embodiment mentioned above, A deformation | transformation, improvement, etc. are possible suitably. In addition, the material, shape, dimensions, number, arrangement location, and the like of each component in the above-described embodiment are arbitrary and are not limited as long as the present invention can be achieved.

11A-11F Condensing lens 14 Light source 20 Lens part 21 Flange part 23 Condensing part 24 Non-condensing part A Use optical path range

Claims (2)

A condensing lens provided with a supporting flange on a lens that condenses the light from the light source;
The lens unit includes a condensing unit having a curved surface that guides light from the light source to a use optical path range in a predetermined direction, and a non-condensing unit composed of a portion other than the condensing unit,
The condensing lens, wherein the flange portion is integrally formed around the non-condensing portion.   2. The condensing lens according to claim 1, wherein the lens portion has a planar light incident surface on which light from the light source is incident and protrudes toward the light source from the flange portion.

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