JP2018185895A - Lamp unit, vehicular lighting fixture system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a lamp unit that enhances light utilization efficiency when selectively applying light by using a liquid crystal element (liquid crystal device).SOLUTION: A lamp unit 103R (103L) includes a light source 1, a reflection polarizing plate 3 arranged at a position on which light from the light source is incident, a reflecting mirror 6 for reflecting reflected light generated by the reflection polarizing plate to make it incident on the reflection polarizing plate again, a liquid crystal device 4 arranged on the side of a light emitting surface of the reflection polarizing plate, a polarizing plate 5 arranged on the side of a light emitting surface of the liquid crystal device, and a projection lens 7 arranged on the side of a light emitting surface of the polarizing plate.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a lamp unit that generates irradiation light with various light distribution patterns, a vehicle lamp system including the lamp unit, and the like.

  Japanese Patent Laying-Open No. 2005-183327 (Patent Document 1) discloses a cut-off suitable for a light distribution pattern for a vehicle headlamp by blocking a part of light emitted forward from a light emitting unit by a light shielding unit. The vehicle headlamp which forms is disclosed. An electro-optical element capable of realizing selective light control according to the shape of the light distribution pattern is used for the light shielding portion in the vehicle headlamp. For example, a liquid crystal element is used as the electro-optical element.

  By the way, in the conventional vehicle headlamp described above, when, for example, a general TN type liquid crystal element is used as the light shielding portion, there is a disadvantage that the light use efficiency of the irradiation light from the light emitting portion is lowered. This is because a pair of polarizing plates is included as a component of the liquid crystal element, and considering the principle and the influence of light absorption by each polarizing plate, the light transmittance of the liquid crystal element is about 35% or less. Due to that.

JP 2005-183327 A

  A specific aspect of the present invention is to provide a technique capable of improving the light use efficiency when selective light irradiation is performed using a liquid crystal element (liquid crystal device).

[1] A lamp unit according to an aspect of the present invention is generated by (a) a light source, (b) a reflective polarizing plate disposed at a position where light from the light source is incident, and (c) the reflective polarizing plate. A reflecting mirror that reflects the reflected light and re-enters the reflective polarizing plate; (d) a liquid crystal device disposed on the light output surface side of the reflective polarizing plate; and (e) a light output surface side of the liquid crystal device. A lamp unit comprising: a polarizing plate disposed; and (f) a lens disposed on a light exit surface side of the polarizing plate.
[2] A vehicular lamp system according to an aspect of the present invention is a vehicular lamp system including the lamp unit described above and a control unit that controls operations of the light source and the liquid crystal device of the lamp unit.

  According to the above configuration, it is possible to improve the light use efficiency when performing selective light irradiation using a liquid crystal element (liquid crystal device).

FIG. 1 is a block diagram illustrating a configuration of a vehicular lamp system according to an embodiment. FIG. 2 is a diagram illustrating a configuration example of the lamp unit according to the first embodiment. FIG. 3 is a diagram for explaining an index for determining a suitable value of N / A of the projection lens. FIG. 4 is a schematic cross-sectional view illustrating a configuration example of the liquid crystal device. FIG. 5 is a schematic plan view illustrating a configuration example of each second electrode provided on the second substrate of the liquid crystal device. FIG. 6 is a diagram illustrating a configuration example of a lamp unit according to the second embodiment. FIG. 7 is a diagram illustrating a configuration example of a lamp unit according to the third embodiment.

(First embodiment)
FIG. 1 is a block diagram illustrating a configuration of a vehicular lamp system according to an embodiment. The vehicle lamp system shown in FIG. 1 performs target recognition (for example, an oncoming vehicle, a preceding vehicle, a walking) by performing image recognition processing by the control unit 102 based on an image around the host vehicle (for example, forward) captured by the camera 101. And the like, and the control unit 102 controls the lamp units 103R and 103L according to the position of the target object to perform selective light irradiation. The camera 101 is disposed at a predetermined position (for example, the upper part of the windshield) in the host vehicle. The control unit 102 is realized, for example, by executing a predetermined operation program in a computer system having a CPU, a ROM, a RAM, and the like. In each of the lamp units 103R and 103L, the lamp unit 103R is disposed on the front right side of the host vehicle, and the lamp unit 103L is disposed on the front left side of the host vehicle.

  FIG. 2 is a diagram illustrating a configuration example of the lamp unit according to the first embodiment. Although the lamp unit 103R will be described here, the lamp unit 103L has the same configuration (the same applies hereinafter). The illustrated lamp unit 103R includes a light source 1, a collimating lens 2, a reflective polarizing plate (reflective polarizer) 3, a liquid crystal device 4, a polarizing plate 5, a reflecting mirror 6, and a projection lens 7.

  The light source 1 includes a light emitting element such as an LED, and emits white light, for example. The number of light emitting elements may be one or more. When using a plurality of light emitting elements, it is preferable to arrange the light emitting elements in the depth direction on the paper surface of FIG.

  The spread angle of light emitted from the light source 1 is preferably as narrow as possible. For this reason, it is also preferable to collimate outgoing light by arranging a lens immediately above a light emitting element such as an LED. Further, it is preferable that the center of the light beam by the light of the light source 1 (indicated by a one-dot chain line in the figure) is irradiated near the center of the liquid crystal device 4. The light quantity of the light source 1 is set so that necessary and sufficient luminance can be obtained in consideration of the loss caused by the optical system.

  The collimating lens 2 is disposed in front of the light emitting portion of the light source 1 and condenses the light emitted from the light source 1 to convert it into substantially parallel light.

  The reflective polarizing plate 3 is, for example, a wire grid polarizing plate, which transmits polarized light in a specific direction and reflects polarized light in other directions. A wire grid polarizing plate here is a polarizing plate comprised by providing many thin wires which consist of metals, such as aluminum, on hard substrates, such as a glass substrate, and is excellent in heat resistance. As the reflective polarizing plate 3, a reflective polarizing plate using an optical multilayer film may be used.

  The liquid crystal device 4 is disposed on the light exit surface side of the reflective polarizing plate 3 and modulates incident light to form various light distribution patterns. The liquid crystal device 4 has, for example, a plurality of light modulation areas arranged in a matrix, and each light modulation area can be controlled independently. As shown in the figure, the liquid crystal device 4 is a flat device, and is arranged so that its main surface is substantially parallel to the reflective polarizing plate 3.

  The liquid crystal device 4 is preferably arranged with a gap (for example, several mm) between them without being in close contact with either the reflective polarizing plate 3 or the polarizing plate 5. This is because the reflective polarizing plate 3 may have heat due to the irradiation light from the light source 1 and the heat may be transmitted to the liquid crystal device 4 to cause a malfunction. Providing a gap facilitates cooling by a fan or the like.

  When an optical compensator (not shown) is combined with the liquid crystal device 4, the optical compensator may be directly bonded to any one of the liquid crystal device 4, the reflective polarizing plate 3, and the polarizing plate 5. In that case, the optical compensation plate is disposed so as to be positioned between the reflective polarizing plate 3 and the polarizing plate 5.

  The polarizing plate 5 is disposed on the light emitting surface side of the liquid crystal device 4, and light (polarized light) transmitted through the liquid crystal device 4 is incident thereon. As the polarizing plate 5, for example, a polarizing plate made of a general organic material (iodine type, dye type, etc.) can be used. Moreover, when importance is attached to heat resistance, a wire grid polarizing plate may be used. In this case, it is preferable to use a wire grid polarizing plate that suppresses surface reflection. Further, the polarizing plate 5 may be formed by stacking a polarizing plate made of an organic material and a wire grid polarizing plate.

  The reflecting mirror 6 is disposed at a position facing the light incident surface side of the reflective polarizing plate 3, and when light reflected on the light incident surface of the reflective polarizing plate 3 is incident, this light is reflected to reflect the reflective polarizing plate 3. Re-enter the The reflecting mirror 6 is not particularly limited. For example, a reflecting mirror configured by providing a general reflecting film (aluminum film, silver alloy film, optical multilayer film, etc.) on a base material can be used. The reflecting state of the reflecting mirror 6 is preferably specular reflection, and therefore the surface of the reflecting mirror 6 is preferably as smooth as possible. When using resin as a base material, you may produce by resin molding etc.

  Regarding the positional relationship between the reflecting mirror 6, the light source 1, and the reflecting polarizing plate 3, the direction in which the light (light beam) of the light source 1 is regularly reflected with respect to the light incident surface (reflecting surface) of the reflecting polarizing plate 3, and the reflecting mirror 6. It is preferable that the normal direction of the central portion of the reflecting surface coincides. Further, the positional relationship between the reflecting mirror 6 and the light source 1 is that the optical axis of the light emitted from the light source 1 with respect to the normal direction of the light incident surface of the reflective polarizing plate 3 (the central axis of the optical axis of the lamp unit). It is preferable to incline both of them so that the optical axis of the light reflected by the reflecting mirror 6 is point-symmetric. In addition, as shown in the figure, it is most preferable that the light source 1 is disposed relatively on the upper side in the vertical direction as the lamp unit and the reflecting mirror 6 is disposed on the lower side. The light source 1 and the reflecting mirror 6 may be disposed.

  The projection lens 7 is disposed on the light exit surface side of the polarizing plate 5 and condenses and projects an image formed by light transmitted through the polarizing plate 5. This projected image becomes light emitted by the vehicle lamp system. As the projection lens 7, for example, a reverse projection type projector lens having a focal point at a specific distance can be used. In this case, those having a large N / A (numerical aperture) are preferable. The projection lens 7 is preferably arranged so that the above-mentioned focal point is located in a liquid crystal layer (described later) portion of the liquid crystal device 4, but the projected image is sharply arranged by deviating the focal point. You can also avoid becoming too much. The projection lens 7 may be provided with an image shifter function.

  In this lamp unit 103R, all the components of the light emitted from the light source 1 (including the light reflected by the reflecting mirror 6) are the respective light control function portions of the liquid crystal device 4 (light control electrode forming portions described later). Each component is arranged so as to be incident on the aperture portion of the reflective polarizing plate 3 and the aperture portion of the projection lens 7.

  FIG. 3 is a diagram for explaining an index for determining a suitable value of N / A of the projection lens. Angles θ1 and θ2 defined in the figure indicate the inclination angles of light rays that are incident most inclined with respect to the center line (dashed line) of the projection lens 7 out of the light projected onto the projection lens 7, respectively. ing. Here, assuming that θ1 <θ2, the N / A of the projection lens 7 to be selected in this case is determined by the relational expression N / A = sin θ2. Thus, it is preferable to select (design / manufacture) the projection lens 7 according to the optical system to be used. Note that it is preferable that the angle θ1 and the angle θ2 be made equal by optimizing the optical system, because the N / A of the projection lens 7 can be further reduced.

  FIG. 4 is a schematic cross-sectional view illustrating a configuration example of the liquid crystal device. The illustrated liquid crystal device 4 includes a first substrate 11 and a second substrate 12 which are arranged to face each other, a first electrode 13 provided on the first substrate 11, and a plurality of second electrodes 14 provided on the second substrate 12. And a liquid crystal layer 17 disposed between the first substrate 11 and the second substrate 12. The reflective polarizing plate 3 and the polarizing plate 5 that are disposed to face each other with the liquid crystal device 4 interposed therebetween are disposed, for example, with their absorption axes substantially orthogonal to each other. In the present embodiment, a normally black mode is assumed, which is an operation mode in which light is shielded (the transmittance is extremely low) when no voltage is applied to the liquid crystal layer 17 of the liquid crystal device 4.

  The first substrate 11 and the second substrate 12 are each a rectangular substrate in plan view, and are disposed to face each other. As each substrate, for example, a transparent substrate such as a glass substrate or a plastic substrate can be used. For example, a large number of spacers are uniformly distributed between the first substrate 11 and the second substrate 12, and the substrate gap is maintained at a desired size (for example, about several μm) by these spacers.

  The first electrode 13 is provided on one surface side of the first substrate 11. Each second electrode 14 is provided on one surface side of the second substrate 12. Each electrode is configured by appropriately patterning a transparent conductive film such as indium tin oxide (ITO), for example. Although illustration is omitted, an insulating film may be further provided on the upper surface of each electrode. Each of the regions where each second electrode 14 and first electrode 13 overlap functions as a light modulation region.

  The first alignment film 15 is provided on one surface side of the first substrate 11 so as to cover the first electrode 13. The second alignment film 16 is provided on one surface side of the second substrate 12 so as to cover each second electrode 14. As each alignment film, an alignment film that restricts the alignment state of the liquid crystal layer 17 to a substantially horizontal alignment is used. Each alignment film is subjected to a uniaxial alignment process such as a rubbing process and has an alignment regulating force in one direction. The direction of the alignment treatment for each alignment film is set to be substantially orthogonal to each other, for example.

The liquid crystal layer 17 is provided between the first substrate 11 and the second substrate 12. In the present embodiment, the liquid crystal layer 17 is formed using a fluid nematic liquid crystal material having a positive dielectric anisotropy Δε and containing an appropriate amount of chiral material. The liquid crystal layer 17 of this embodiment has an initial alignment determined by the alignment regulating force of the first alignment film 15 and the second alignment film 16, and the alignment direction of the liquid crystal molecules when no voltage is applied is the same as that of the first substrate 11. The second substrate 12 is twisted by approximately 90 °. The liquid crystal layer 17 has a pretilt angle of several degrees with respect to each substrate surface.
When a voltage equal to or higher than the threshold is applied between the first electrode 13 and the second electrode 14, the liquid crystal molecules in the liquid crystal layer 17 are untwisted and rise in the substrate normal direction.

  FIG. 5 is a schematic plan view illustrating a configuration example of each second electrode provided on the second substrate of the liquid crystal device. As an example, the present embodiment assumes a liquid crystal device 4 that operates by static drive, and a plurality of second electrodes 14 that are separated and independent from each other are arranged in a matrix on one surface of the second substrate 12. FIG. 5 shows a part of the multiple second electrodes 14. Each of the second electrodes 14 in the illustrated example has a substantially rectangular shape in plan view, but is formed in different shapes and areas in order to correspond to various light distribution patterns. In addition, each second electrode 14 is electrically and physically separated and independent, and a wiring is associated with each of the second electrodes 14 so that a voltage can be applied individually.

  Each wiring connected to each second electrode 14 is provided so as to extend either upward or downward in the drawing. Specifically, each wiring connected to each second electrode 14 for the upper three rows in the figure is provided so as to extend upward in the figure, and each second electrode for the lower four rows in the figure. Each wiring connected to 14 is provided so as to extend downward in the drawing. Each wiring extends to one end side or the other end side of the second substrate 12 and receives a drive voltage supplied from an external drive device (not shown).

  In order to pass each wiring, each 2nd electrode 14 differs in the width | variety of the x direction in a figure for every row. Specifically, with respect to the second electrodes 14 for the upper three rows, the width in the x direction becomes smaller toward the upper side along the y direction in the figure. Thereby, a region for providing wiring is secured. In addition, with respect to the second electrodes 14 for the lower four rows, the width in the x direction is smaller toward the lower side along the y direction in the figure. Thereby, a region for providing wiring is secured.

  Each of the second electrodes 14 is disposed so as to face the first electrode 13. By individually applying a voltage to each of the second electrodes 14 and applying a predetermined voltage to the first electrode 13, light transmission / reception is performed for each light modulation region that is a region corresponding to each second electrode 14. Non-transparent can be switched.

  An image corresponding to a desired light distribution pattern can be formed by the liquid crystal device 4 having such a configuration, and the reflective polarizing plate 3 and the polarizing plate 5 disposed so as to face each other, and the image is formed by the projection lens 7. Irradiating light with a desired light distribution pattern can be realized in front of the host vehicle by inverting and projecting in a point-symmetric manner. Specifically, as described above, it is possible to realize irradiation light in which a light irradiation region and a non-irradiation region are set according to the presence or absence of an oncoming vehicle or the like.

Hereinafter, a preferred method for manufacturing the liquid crystal device 4 included in the lamp unit will be described.
A pair of glass substrates is prepared. For example, a material in which a transparent conductive film such as ITO is previously formed is used. Examples of a method for forming the transparent conductive film include a sputtering method and a vacuum deposition method. The first electrode 13 and the second electrodes 14 are formed by patterning the transparent conductive film of the glass substrate. At this time, wiring for routing is also formed at the same time (see FIG. 5). In this way, the first substrate 11 having the first electrode 13 and the second substrate 12 having each second electrode 14 are obtained.

  Next, the first alignment film 15 is formed on the first substrate 11, and the second alignment film 16 is formed on the second substrate 12. Specifically, a horizontal alignment film material is applied to each of the first substrate 11 and the second substrate 12 by flexographic printing or an inkjet method, and then heat treatment is performed. As the horizontal alignment film material, for example, a main chain type horizontal alignment film material is used. The film thickness when applied is about 500 to 800 mm. As the heat treatment, for example, baking is performed at 160 to 250 ° C. for 1 to 1.5 hours. When the liquid crystal layer 17 is vertically aligned, a vertical alignment film material is used instead of the horizontal alignment film material. In addition, in any orientation of the liquid crystal layer 17, an alignment film material made of an inorganic material, for example, a material in which the main chain skeleton is formed of a siloxane bond (Si—O—Si bond) may be used.

  Next, an alignment process is performed on each of the first alignment film 15 and the second alignment film 16. As the alignment process, for example, a rubbing process in one direction is performed. The amount of pushing that is a condition at this time can be set to, for example, 0.3 mm to 0.8 mm. Here, when the first substrate 11 and the second substrate 12 are overlaid, the direction of the rubbing process on each of the first alignment film 15 and the second alignment film 16 intersects at an angle of approximately 90 °. Set the rubbing direction to. The direction of the rubbing process is not limited to this and can be set in various ways.

  Next, a sealing material is formed on one surface of the one substrate (for example, the first substrate 11). Here, a thermosetting or photocurable sealing material (epoxy, acrylic, etc.) having high heat resistance is used. Specifically, a main seal material containing an appropriate amount (for example, 2 to 5 wt%) of a gap control material is formed on one surface of the first substrate 11. The main sealing material is formed by, for example, a screen printing method or a dispenser printing method. The diameter of the gap control material included in the main seal material is selected according to the set value of the layer thickness of the liquid crystal layer 17 and is, for example, about 4 μm.

  Further, a gap control material is dispersed on one surface of the other substrate (for example, the second substrate 12) or a rib material is formed. In the case of using a gap control material, for example, plastic balls having a particle size of 4 μm are sprayed by a dry gap material sprayer. If a rib material is used, the resin film is patterned.

  Next, the first substrate 11 and the second substrate 12 are overlapped with each electrode formation surface facing each other, and heat treatment or ultraviolet irradiation is performed in a state where pressure is constantly applied by a press machine or the like, whereby the main seal is formed. Harden the material. For example, if a thermosetting sealing material is used, heat treatment at 150 ° C. is performed.

  Next, the liquid crystal layer 17 is formed by filling the gap between the first substrate 11 and the second substrate 12 with a liquid crystal material. The liquid crystal material is filled by, for example, a vacuum injection method. A liquid crystal material having a positive dielectric anisotropy Δε and a refractive index anisotropy Δn of, for example, about 0.15 can be used. Note that a small amount of chiral material may be added to the liquid crystal material. The liquid crystal material may be filled by an ODF method. When the liquid crystal layer 17 is vertically aligned, a liquid crystal material having a negative dielectric anisotropy is used.

  After the liquid crystal layer 17 is formed, the inlet is sealed with an end seal material. For example, an ultraviolet curable resin is used as the end seal material. In this way, the liquid crystal device 4 is completed.

(Second Embodiment)
FIG. 6 is a diagram illustrating a configuration example of a lamp unit in the vehicle lamp system of the second embodiment. The illustrated lamp unit 113 </ b> R basically has the same configuration as the lamp unit 103 </ b> R of the first embodiment described above, and is different only in that the reflective polarizing plate 3 is inclined. Specifically, in the lamp unit 113 </ b> R, the liquid crystal device 4 and the polarizing plate 5 are arranged so that their main surfaces are substantially orthogonal to the center line (one-dot chain line) of the projection lens 7. On the other hand, the reflective polarizing plate 3 is inclined with a main surface (light incident surface) having a predetermined angle θ (> 0) with the main surface (light incident surface) of the liquid crystal device 4. .

  Also in the second embodiment, a part of the central point of the light emitted from the light source 1 passes through the reflective polarizing plate 3 and is irradiated on the substantial center of the main surface of the liquid crystal device 4 and is emitted from the light source 1. Each of the components is reflected so that the central point of the reflected light is reflected at the center of the main surface of the liquid crystal device 4 when the light is partially reflected by the reflective polarizing plate 3 and incident on and reflected by the reflecting mirror 6. Place.

(Third embodiment)
FIG. 7 is a diagram illustrating a configuration example of a lamp unit in the vehicle lamp system of the third embodiment. The illustrated lamp unit 123 </ b> R basically has the same configuration as the lamp unit 103 </ b> R of the first embodiment described above, and a retardation plate 8 is additionally disposed on the front side of the reflecting mirror 6. Only is different. As the retardation plate 8, various materials such as a film, a crystal plate, a liquid crystal polymer film, and a liquid crystal panel can be used.

  As the retardation plate 8, for example, a broadband ½ wavelength plate (λ / 2 plate), ¼ wavelength plate (λ / 4 plate), 3/4 wavelength plate (3λ / 4 plate), or the like is used. Can do. When a quarter wavelength plate is used as the phase difference plate 8, it is preferable that the slow axis direction is disposed at an angle of approximately 45 ° with respect to the polarization axis of the reflective polarizing plate 3. When using a plate, it is preferable to arrange the slow axis direction so as to form an angle of approximately 22.5 ° with respect to the polarization axis of the reflective polarizing plate 3. With such an arrangement, for example, the linearly polarized light in a specific direction of the reflected light generated by the reflective polarizing plate 3 passes through the quarter wavelength plate once to become circularly polarized light, is reflected by the reflecting mirror 6 and is again 1 / By passing through the four-wavelength plate, it becomes linearly polarized light rotated by 90 ° from the specific direction and re-enters the reflective polarizing plate 3, so that most of the light component is transmitted through the reflective polarizing plate 3.

  When generalized, the light emitted from the light source 1 passes through the retardation plate 8 2n times (n: natural number). The phase difference provided by the phase difference plate 8 is, for example, λ / 2n−λ / 4 (n: natural number) when the wavelength of light is λ. The polarization direction of light reflected by the reflective polarizing plate 3, reflected by the reflective mirror 6, and re-entering the reflective polarizing plate 3 is controlled by the phase difference plate 8, so that (180n−90) ° (n: integer) ) Only changes.

  In the lamp unit 123R shown in FIG. 7 as well, the reflective polarizing plate 3 may be tilted in the same manner as the lamp unit 113R of the second embodiment described above.

  According to each embodiment as described above, the light reflected by the reflective polarizing plate 3 of the lamp unit is reflected by the reflecting mirror 6 and re-entered into the reflective polarizing plate 3, so that the light use efficiency can be improved. it can. Therefore, it is possible to increase the light use efficiency in the vehicle lamp system that performs selective light irradiation using the liquid crystal element. Further, when the retardation plate 8 is used, the light utilization efficiency can be further increased.

  Note that the present invention is not limited to the contents of the above-described embodiment, and various modifications can be made within the scope of the gist of the present invention. For example, in the above-described embodiment, the normally black mode is assumed as the operation mode of the liquid crystal device, but a normally white mode may be used. Further, the liquid crystal device is exemplified by the liquid crystal layer having a twisted alignment (TN alignment), but is not limited thereto. A liquid crystal device using any operation mode may be used as long as light can be controlled to be partially transmissive / non-transmissive. Further, an optical compensation plate such as a C plate may be appropriately combined with the liquid crystal device.

  In the above-described embodiment, the case where the present invention is applied to a vehicle lamp system that performs selective light irradiation with respect to the presence or absence of an oncoming vehicle or the like in front of the vehicle has been described. The range is not limited to this. For example, the present invention is applied to a vehicular lamp system that switches light irradiation according to the turning direction of the vehicle, a vehicular lamp system that variably controls the optical axis direction of the headlamp according to the inclination angle of the vehicle in the front-rear direction. It is also possible to do. In addition, the present invention can be applied to a vehicular lamp system that switches between a high beam and a low beam in a headlamp without depending on a mechanical operation portion.

  Moreover, the lamp unit according to the present invention can be used not only for a vehicle but also for various uses as a lighting device capable of generating various orientation patterns.

1: Light source 2: Collimating lens 3: Reflective polarizing plate 4: Liquid crystal device 5: Polarizing plate 6: Reflecting mirror 7: Projection lens 8: Retardation plate 101: Camera 102 :: Control unit 103R, 103L: Lamp unit

Claims (5)

A light source;
A reflective polarizing plate disposed at a position where light from the light source is incident;
A reflecting mirror that reflects the reflected light generated by the reflective polarizing plate and re-enters the reflective polarizing plate;
A liquid crystal device disposed on the light exit surface side of the reflective polarizing plate;
A polarizing plate disposed on the light emitting surface side of the liquid crystal device;
A lens disposed on the light exit surface side of the polarizing plate;
Including the lamp unit. The light source is disposed such that its optical axis intersects the normal direction of the light incident surface of the reflective polarizing plate,
The lamp unit according to claim 1. The reflective polarizing plate is disposed obliquely with its main surface having an angle greater than 0 ° with the main surface of the liquid crystal device.
The lamp unit according to claim 1 or 2. Further comprising a retardation plate disposed on the front side of the reflecting mirror,
The lamp unit according to claim 1. The lamp unit according to any one of claims 1 to 4,
A control unit that controls operations of the light source of the lamp unit and the liquid crystal device;
A vehicle lamp system.

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