JP6149715B2 - Optical sensor and head-up display device - Google Patents

Description

  The present invention relates to an optical sensor and a head-up display device (hereinafter referred to as a HUD device).

  Conventionally, an optical sensor provided with a condensing member is known. The optical sensor (flame sensor) disclosed in Patent Document 1 includes a detection element (discharge tube) that detects the amount of light, and a cylindrical tube portion (light collecting member) that has holes at both ends and the diameter decreases toward the element. ). Here, the reflecting surface is preferably a parabolic surface or a conical surface, and is preferably in a mirror state so as to easily reflect ultraviolet rays, and at least the inner surface is made of a material that reflects ultraviolet rays, such as metal.

JP 2011-214893 A

  Since the optical sensor disclosed in Patent Document 1 condenses all incident light by the condensing member, it is possible to detect incident light from various directions. However, in such an optical sensor, the detection element becomes high temperature due to condensing, so that noise or error occurs in the detection result of the detection element, deterioration of the detection element is accelerated, and the detection accuracy is deteriorated. There was a problem.

  The present invention has been made in view of the above-described problems, and an object thereof is to provide an optical sensor and a HUD device that avoid deterioration in detection accuracy.

In one of the disclosed inventions, an optical sensor includes a detection element that detects the amount of light, and a cylindrical cylindrical portion that has openings at both ends, and the diameter of the inner peripheral hole decreases toward the detection element. The portion is translucent, and incident light incident from the opposite side of the detection element is reflected light that is collected toward the detection element by reflection, and transmitted light that is emitted to the outside of the cylindrical portion by transmission. It is characterized by dividing into.

  According to such an invention, the cylindrical portion has openings at both ends, and the diameter of the inner peripheral hole becomes smaller toward the detection element, so that incident light incident from various directions opposite to the detection element can be obtained. , Can be condensed. Further, the incident light is divided into reflected light collected by the tube portion toward the detection element by reflection and transmitted light emitted to the outside of the tube portion by transmission. According to this, since not all the incident light is condensed on the detection element, it is possible to avoid that the light is converted into heat and the detection element becomes high temperature. Therefore, it is possible to avoid deterioration in detection accuracy.

Another aspect of the disclosed invention is a head-up display device that is mounted on a moving body and projects the image onto a projection surface of the moving body so that the image is displayed as a virtual image so as to be visible from inside the moving body. And a detection element that detects the amount of light, and a cylindrical cylindrical part that has openings at both ends and the diameter of the inner peripheral hole decreases toward the detection element, and the cylindrical part is translucent. An optical sensor that divides incident light incident from the opposite side of the detection element into reflected light that is collected toward the detection element by reflection and transmitted light that is emitted to the outside of the cylindrical portion by transmission; and an optical sensor And a control means for controlling display of a virtual image based on the detection result.

  According to such an invention, incident light incident on the optical sensor included in the HUD device is divided into reflected light and transmitted light by the cylindrical portion. Then, the reflected light is collected toward the detection element, and the transmitted light is emitted outside the cylindrical portion. According to this, since not all the incident light is condensed on the detection element, it is possible to avoid that the external light is converted into heat and the detection element becomes high temperature. Furthermore, based on the detection result of the optical sensor, a virtual image displayed by the HUD device so as to be visible from inside the moving body is controlled. As described above, a display corresponding to the amount of external light detected with high accuracy can be maintained for a long time.

It is a schematic diagram which shows the mounting state to the vehicle of the HUD apparatus which comprises the optical sensor in 1st Embodiment. It is a front view which shows the display state of the HUD apparatus in 1st Embodiment. It is a schematic diagram which shows the HUD apparatus in 1st Embodiment. It is a perspective view which shows the structure of the indicator in 1st Embodiment. It is sectional drawing which shows the optical sensor in 1st Embodiment. It is a schematic diagram which shows partially the optical sensor in 2nd Embodiment. It is a graph which shows the characteristic of the dielectric multilayer in 2nd Embodiment.

  Hereinafter, a plurality of embodiments of the present invention will be described with reference to the drawings. In addition, the overlapping description may be abbreviate | omitted by attaching | subjecting the same code | symbol to the corresponding component in each embodiment. When only a part of the configuration is described in each embodiment, the configuration of the other embodiment described above can be applied to the other part of the configuration. In addition, not only combinations of configurations explicitly described in the description of each embodiment, but also the configurations of a plurality of embodiments can be partially combined even if they are not explicitly specified unless there is a problem with the combination. .

(First embodiment)
As shown in FIG. 1, the optical sensor 50 according to the first embodiment of the present invention is provided in the HUD device 100. The HUD device 100 is mounted in the instrument panel 4 in the vehicle 2 as a moving body having the front windshield 3 and the instrument panel 4. Here, in the vehicle 2, in the vehicle 2, the surface on the indoor side of the front windshield 3 forms a projection surface 3a on which an image is projected into a curved concave surface or a flat flat surface. Further, in the vehicle 2, the front windshield 3 may be one that suppresses the optical path difference between the indoor side surface and the outdoor side surface, or a vapor deposition film or film or the like is used to suppress the optical path difference. It may be provided on the indoor side surface.

  In the vehicle 2 on which the image is projected onto the projection surface 3a, the luminous flux of the image reflected by the projection surface 3a reaches the occupant's eye point 6 in the room. The passenger visually recognizes the virtual image 7 of the image formed in front of the front windshield 3 by perceiving the light flux reaching the eye point 6. As shown in FIG. 2, as the virtual image 7, an indication display 7a of the traveling speed of the vehicle, an indication display 7b of the traveling direction of the vehicle by the navigation system, a warning display 7c related to the vehicle, and the like are displayed.

  Hereinafter, the HUD device 100 will be briefly described. As shown in FIG. 3, the HUD device 100 includes a display 10, a concave mirror 20, an optical sensor 50, a controller 30, and the like.

  For example, as shown in FIG. 4, the display device 10 includes a backlight 12, a projection lens 14, and a liquid crystal panel 16.

  The backlight 12 includes a light source 12a, a condenser lens 12b, a diffusion plate 12c, and the like. The light source 12 a is a light emitting element made of, for example, a light emitting diode, and is disposed on the light source circuit board 18. The light source 12a is electrically connected to the controller 30 and a power source (not shown) through a wiring pattern (not shown) on the light source circuit board 18. The light source 12a emits light according to the amount of current when energized to project the light source light toward the condenser lens 12b. The condenser lens 12b is a translucent convex lens made of synthetic resin or glass, and is disposed between the light source 12a and the diffusion plate 12c. The condensing lens 12b condenses the light source light from the light source 12a and emits it toward the diffusion plate 12c. The diffusing plate 12 c is a translucent or milky white plate formed of a synthetic resin such as polycarbonate in which a light diffusing material is kneaded, and is disposed between the condenser lens 12 b and the projection lens 14. The diffusing plate 12c emits light source light, whose luminance uniformity is adjusted by diffusion, toward the projection lens 14.

  The projection lens 14 is a translucent convex lens made of synthetic resin or glass, and is disposed between the backlight 12 and the liquid crystal panel 16. The projection lens 14 condenses the light source light from the backlight 12 and projects it toward the liquid crystal panel 16.

  The liquid crystal panel 16 is a dot matrix type TFT liquid crystal panel, for example. Although not shown, the liquid crystal panel 16 has a plurality of liquid crystal pixels arranged in a two-dimensional direction, and each liquid crystal pixel is controlled by an electrically connected controller 30. Thereby, the liquid crystal panel 16 transmits the light source light from the projection lens 14 to display an image, and projects the image toward the concave mirror 20.

  Here, the display device 10 may be of another method as long as it can display an image. For example, an image may be displayed using a reflective liquid crystal element. Further, for example, an image may be displayed by scanning a laser beam with a micro electro mechanical system (MEMS).

  As shown in FIG. 3, the concave mirror 20 is formed by vapor-depositing aluminum as the reflecting surface 20a on the surface of a base material made of synthetic resin or glass. The reflecting surface 20a is formed in a smooth curved surface as a concave surface in which the center of the concave mirror 20 is recessed. With this shape, the concave mirror 20 projects the image on the projection surface 3a by reflecting the light of the image from the display 10 toward the projection surface 3a of the vehicle 2. In FIG. 3, the light path of the image is indicated by a broken line.

  Here, in this embodiment, the example which projects the light of the image from the display 10 on the projection surface 3a using the single concave mirror 20 was shown. However, a plurality of concave mirrors may be used as long as the image light from the display device 10 is projected onto the projection surface 3a. Alternatively, a predetermined number of at least one of a plane mirror or other optical elements may be used.

  The optical sensor 50 detects the amount of light incident on the optical sensor 50. As shown in FIGS. 1, 3, and 5, in the unit of the HUD device 100, the HUD device 100 is disposed at a different location from the optical system such as the display 10 and the concave mirror 20. Specifically, the inner peripheral hole 58 of the optical sensor 50 is disposed toward the front windshield 3 in the instrument panel 4, and light can be taken in through the incident window 4 a vacated in the instrument panel 4. (Hereinafter, referred to as “external light” in order to distinguish it from the light source light and the image light). The incident window 4a of the instrument panel 4 prevents the internal structure of the HUD device 100 from being looked into from the outside.

  Hereinafter, the optical sensor 50 will be described in detail with reference to FIG. The optical sensor 50 includes a detection element 52, a cylinder portion 54, and a cover 63.

  The detection element 52 includes, for example, a sensor circuit board 52a and a photodiode 52b that is fixed on the sensor circuit board 52a and has a PN junction. When the photodiode 52b receives external light having a wavelength of energy larger than the band gap of silicon as a semiconductor material, the photodiode 52b generates a photocurrent by the photovoltaic effect. Since the terminals (not shown) of the photodiode 52b and the detection circuit (not shown) of the sensor circuit board 52a are electrically connected using solder, the generated photocurrent is supplied to the detection circuit. Therefore, it can be detected as a light quantity. In particular, when the wavelength of light is a short wavelength, the proportion of light converted into heat increases by being absorbed by a diffusion layer (not shown) provided on the light receiving surface side of the photodiode 52b. , Detection sensitivity falls. As a result, the detection element 52 of the present embodiment detects the amount of light from infrared light to ultraviolet light.

  The cylindrical portion 54 is a translucent cylindrical member made of a synthetic resin such as polymethyl methacrylate resin (PMMA) or glass, and is disposed between the incident hole 63 a and the detection element 52. Further, the cylindrical portion 54 has circular openings 57a and 57b on both end faces 56a and 56b, and the diameter DI of the inner peripheral hole 58 becomes smaller toward the detection element 52 from the incident hole 63a side. The reduction ratio gradually increases toward the detection element 52. That is, the inner peripheral wall surface 59 forming the inner peripheral hole 58 is formed in a free curved surface shape. Moreover, the inner peripheral hole 58 is formed in a hollow which is a lensless without a lens. On the other hand, the outer peripheral wall surface 60 on the outer periphery of the cylindrical portion 54 also has a smaller diameter on the detection element 52 side.

  The cover 63 is made of a synthetic resin, and is formed in a cup shape integrally with the optical system housing 40 such as the display 10 and the concave mirror 20. The cover 63 holds the detection element 52 and the cylindrical portion 54, and is cylindrical through the space. It is a member that covers the portion 54. The cover 63 is light-shielding and can absorb light. The cover 63 has an incident hole 63a. The incident hole 63a is provided on the incident side of the cylindrical portion 54, more specifically, between the incident window 4a and the incident-side opening 57a of the cylindrical portion 54. With this arrangement, the incident hole adjusts the amount of incident light of external light and prevents the external structure of the optical sensor 50 from being looked into. Here, the diameter DH of the incident hole 63a is set smaller than the diameter DW of the incident window 4a. The diameter DH of the incident hole 63a is set to be smaller than the diameter DI1 of the inner peripheral hole 58 in the incident side opening 57a.

  The controller 30 of the HUD device 100 is a control circuit formed mainly with a microcomputer, and is electrically connected to the optical sensor 50 and the display 10. Then, the controller 30 controls the display of the virtual image 7 that can be viewed from inside the vehicle 2 by controlling the image displayed by the display 10 based on the electrical signal input as the detection result from the optical sensor 50. . In particular, in the present embodiment, the controller 30 controls the display luminance of the virtual image 7 that is visible from the room of the vehicle 2 by controlling the output of the light source 12a of the display 10 based on the detection result from the optical sensor 50. To do. Specifically, the display luminance is increased when the detected light amount of the optical sensor 50 is large, and the display luminance is decreased when the detected light amount is small. The purpose of such control is to provide a display of the virtual image 7 that is easy to see with appropriate contrast according to the brightness of the surroundings of the vehicle 2.

  A supplementary description will be given below of control of external light incident on the optical sensor 50 having such a configuration. The external light is, for example, sunlight, and enters the optical sensor 50 directly from outside the vehicle 2 or through the front windshield 3.

  Here, if the cylindrical portion 54 does not exist between the incident hole 60 a and the detection element 52, only incident light that passes through the incident hole 63 a and linearly goes to the detection element 52 is detected. Will be reached. In other words, the optical sensor having such a configuration can only detect external light from a specific direction.

  In this regard, in the first embodiment, the cylindrical portion 54 is configured to reflect incident light incident from the opposite side of the detection element 52, reflected light that is collected toward the detection element 52 by reflection, and transmission of the cylindrical portion 54. It is divided into transmitted light emitted to the outside. Specifically, after external light from various directions passes through the incident hole 63 a and is incident obliquely as incident light with respect to the normal direction of the inner peripheral wall surface 59, a part of the outer light is caused by the inner peripheral wall surface 59. The remaining part that is reflected and transmitted proceeds into the medium of the cylindrical part 54. The reflected light of the outside light is directed toward the detection element 52 by the cylindrical portion 54 in which the diameter DI of the inner peripheral hole 58 becomes smaller toward the detection element 52 from the incident hole 63a side. As described above, external light from various directions reaches the detection element 52. The outside light that has reached the detection element 52 may be immediately converted into heat on the diffusion layer or the sensor circuit board 52a, or may be converted into heat by the electric resistance of the detection circuit by generating a photocurrent. There is also. When a part of the transmitted light of the external light is transmitted through the outer peripheral wall surface 60 of the cylindrical portion 54 and converted to heat by absorption by the cover 63, the remaining portion is reflected by the outer peripheral wall surface 60 and goes to the detection element 52. The portion 54 may be converted into heat by absorption in the medium. A part of the external light reaches the detection element 52 directly after passing through the incident hole 63a without entering the inner peripheral wall surface 59.

(Function and effect)
The operational effects of the first embodiment described above will be described below.

  According to the first embodiment, the cylindrical portion 54 has openings 57 a and 57 b at both ends, and the diameter DI of the inner peripheral hole 58 becomes smaller toward the detection element 52. Incident light incident from any direction can be collected. Further, incident light is divided into reflected light collected by the cylindrical portion 54 toward the detection element 52 by reflection, and transmitted light emitted to the outside of the cylindrical portion 54 by transmission. According to this, since not all of the incident light is collected on the detection element 52, it is possible to prevent the light from being converted into heat and the detection element 52 from becoming high temperature. Therefore, it is possible to avoid deterioration in detection accuracy.

  Further, according to the first embodiment, since the incident hole 63a for adjusting the amount of incident light is provided on the incident side from the cylindrical portion 54, it is possible to avoid the detection element 52 from becoming high temperature. Furthermore, it is possible to prevent the internal structure from being looked into from the outside.

  Further, according to the first embodiment, since the diameter of the incident hole 63a is smaller than the diameter DI1 of the inner peripheral hole 58 in the incident-side opening 57a, the incident light is prevented from impinging on the end surface 56a of the cylindrical portion 54 and being irregularly reflected. be able to.

  According to the first embodiment, the cover 63 that covers the cylindrical portion 54 via the space has the incident hole 63a and absorbs transmitted light. According to this, both adjustment of the amount of incident light and absorption of transmitted light can be easily performed with one component.

  Further, according to the first embodiment, incident light that enters the optical sensor 50 included in the HUD device 100 is divided into reflected light and transmitted light by the cylindrical portion 54. Then, the reflected light is collected toward the detection element 52, and the transmitted light is emitted outside the cylindrical portion 54. According to this, since all the incident light is not condensed on the detection element, it is possible to avoid that the external light is converted into heat and the detection element 52 becomes high temperature. Furthermore, based on the detection result of the optical sensor 50, the virtual image 7 displayed by the HUD device 100 so as to be visible from inside the vehicle 2 is controlled. As described above, a display corresponding to the amount of external light detected with high accuracy can be maintained for a long time.

  Further, if a lens is used as the light collecting member in the inner peripheral hole 58, another virtual image is formed in front of the front windshield 3 in the instrument panel 4 when the lens is arranged toward the front windshield 3. Feels like it was being shot by the lens, and I feel uncomfortable. However, in the HUD device 100 including the optical sensor 50 in which the inner peripheral hole 58 is lensless, it is difficult for an occupant to feel that way.

(Second Embodiment)
As shown in FIGS. 6-7, 2nd Embodiment of this invention is a modification of 1st Embodiment. The second embodiment will be described focusing on differences from the first embodiment.

  As shown in FIG. 6, the cylindrical portion 254 of the second embodiment includes a light-transmitting cylindrical base material 255 made of a synthetic resin such as polymethyl methacrylate resin (PMMA) or glass, and the cylindrical base material 255. The inner peripheral wall surface 259 includes a dielectric multilayer film 261. The cylindrical base material 255 has the same arrangement and shape as the cylindrical portion 54 in the first embodiment. In the following description, the shape of the cylindrical portion 254 is partially and schematically illustrated in FIG. 6 in order to describe the spectral characteristics of the dielectric multilayer film 261.

The dielectric multilayer film 261 is a multilayer film formed by laminating two or more kinds of dielectrics having different refractive indexes, such as silicon oxide (SiO ₂ ) and titanium oxide (TiO ₃ ). The dielectric multilayer film 261 is laminated along the normal direction of the inner peripheral wall surface 259, transmits light of a specific wavelength using light reflection and interference, and light of another specific wavelength. To reflect. In particular, the dielectric multilayer film 261 of the second embodiment has a reflection characteristic such that the reflectance of visible light is higher than the reflectance of infrared light or ultraviolet light. Here, such reflection characteristics do not necessarily have to be established for visible light of all wavelengths. For example, the average value of the reflectance for each wavelength of visible light is the reflectance for each wavelength of infrared light or ultraviolet light. It is sufficient if it is higher than the average value of. Conversely, as a transmission characteristic, the reflectance of visible light is lower than the reflectance of infrared light or ultraviolet light.

  Such a dielectric multilayer film 261 is realized by appropriately setting the refractive index of the dielectric used and the film thickness of each layer. For example, the dielectric multilayer film 261 having desired characteristics can be easily designed by using thin film calculation software such as Essential Macleod. In particular, the dielectric multilayer film 261 of the second embodiment is set to have a film thickness corresponding to incident light incident obliquely with respect to the normal direction of the inner peripheral wall surface 259. Specifically, the film thickness is set to be thick in consideration of the characteristic that the reflection spectrum of the oblique light is shifted to the short wavelength side compared to the light from the normal direction. For example, light of each wavelength is reflected at a reflectance as shown in FIG. 7 with respect to incident light incident at an angle of 60 degrees with respect to the normal direction of the inner peripheral wall surface 259.

  A supplemental description will be given below of the control of the external light incident on the optical sensor 250 having such a configuration. The external light is, for example, sunlight, and enters the optical sensor 250 directly from the outside of the vehicle 2 or through the front windshield 3. Further, for example, the external light may be, for example, visible light from an external light, infrared light projected to monitor the occupant's status in the interior of the vehicle 2, or red projected to detect an obstacle from the vehicle 2. External light etc. are mentioned.

  Specifically, as shown in FIG. 6, after external light from various directions including visible light, infrared light, and ultraviolet light passes through the incident hole 63 a, from the side opposite to the detection element 52. Incident light is incident on the dielectric multilayer film 261 obliquely with respect to the normal direction of the inner peripheral wall surface 259 (FIG. 6 shows an example of 60 degrees with respect to the normal direction). Due to the spectral characteristics of the dielectric multilayer film 261, visible light out of the external light is mainly reflected by the dielectric multilayer film 261, and infrared light and ultraviolet light are mainly transmitted through the dielectric multilayer film 261. The reflected light of the external light is directed toward the detection element 52 by the cylindrical portion 254 in which the diameter DI of the inner peripheral hole 58 becomes smaller toward the detection element 52 from the incident hole 63a side. In this manner, external light from various directions reaches the detection element 52 with a higher ratio of visible light than that at the time of incidence (in other words, a lower ratio of infrared light or ultraviolet light). It becomes. The reflected light of the external light that has reached the detection element 52 may be immediately converted into heat on the diffusion layer or the sensor circuit board 52a, or it may be converted into heat by the electric resistance of the detection circuit by generating a photocurrent. Sometimes it is done. When a part of the transmitted light of the external light is transmitted through the outer peripheral wall surface 60 of the cylindrical portion 54 and converted to heat by absorption by the cover 63, the remaining portion is reflected by the outer peripheral wall surface 60 and goes to the detection element 52. The portion 54 may be converted into heat by absorption in the medium. Some of the outside light may reach the detection element 52 directly after passing through the incident hole 63a without entering the inner peripheral wall surface 259.

  Also in the second embodiment, the cylindrical portion 254 causes the incident light incident from the side opposite to the detection element 52 to be reflected toward the detection element 52 by reflection, and transmitted to the outside of the cylindrical portion 254. Divided into transmitted light to be emitted. Therefore, also in the second embodiment, it is possible to exhibit the operational effects according to the first embodiment.

  Further, according to the second embodiment, the dielectric multilayer film 261 provided on the inner peripheral wall surface 259 of the cylindrical portion 254 has a reflection characteristic that the reflectance of visible light is higher than the reflectance of infrared light or ultraviolet light. . According to this, the dielectric multilayer film 261 suppresses reflection of infrared light or ultraviolet light, thereby reducing the amount of light collected on the detection element 52 and avoiding the detection element 52 from becoming high temperature. it can. Furthermore, since the amount of light can be detected by increasing the ratio of visible light to incident light, visible light can be detected with high accuracy. In particular, in the HUD device 200 mounted on the vehicle 2, the amount of light can be detected by reducing the ratio of infrared light or ultraviolet light from a driver status monitor, radar, or the like that may be present in the vehicle 2.

  Further, according to the second embodiment, the dielectric multilayer film 261 has a film thickness corresponding to incident light that is incident obliquely with respect to the normal direction of the inner peripheral wall surface 259. According to this, it is possible to reliably split incident light incident on the inner peripheral wall surface 259 obliquely with the spectral characteristic corresponding to the film thickness.

(Other embodiments)
Although a plurality of embodiments of the present invention have been described above, the present invention is not construed as being limited to these embodiments, and various embodiments and combinations can be made without departing from the scope of the present invention. Can be applied.

  Specifically, as Modification 1 regarding the first and second embodiments, the optical sensors 50 and 250 may not have the incident hole 63a. Alternatively, the optical sensors 50 and 250 themselves may not have the incident hole 63a, and the incident window 4a of the instrument panel 4 may be used as the incident hole.

  In the second modification regarding the first to second embodiments, the cylindrical portions 54 and 254 may not have the cover 63.

  In the third modification regarding the first to second embodiments, the diameter DH of the incident hole 63a may be equal to or larger than the diameter DI1 of the inner peripheral hole 58 in the opening 57a on the incident side.

  In the modification 4 regarding the 1st-2nd embodiment, the cylinder parts 54 and 254 or the incident hole 63a may be an ellipse or a polygon.

  In the fifth modification regarding the second embodiment, the dielectric multilayer film 261 may be provided on the outer peripheral wall surface 60, or may be provided on both surfaces of the inner peripheral wall surface 259 and the outer peripheral wall surface 60. Further, it may be provided on a part of the inner peripheral wall surface 259 and the outer peripheral wall surface 60.

  In the sixth modification regarding the first to second embodiments, the optical sensors 50 and 250 may not be included in the HUD devices 100 and 200. For example, the optical sensor of the present invention can also be applied to an object recognition device that detects reflected light from an object.

  In the modified example 7 regarding the first to second embodiments, the HUD devices 100 and 200 may not have the inner peripheral hole 58 disposed toward the front windshield 3 in the instrument panel 4.

  In the modification 8 regarding the 1st-2nd embodiment, the HUD apparatuses 100 and 200 may apply this invention to various mobile bodies (transportation equipment), such as ships other than the vehicle 2, or an airplane.

100,200 Head-up display device (HUD device), 50,250 Optical sensor, 3 Front windshield, 4 Instrument panel, 7 Virtual image, 30 Controller, 52 Detection element, 54,254 Tube, 57a, 57b Opening, 58 Inner peripheral hole, 59,259 inner peripheral wall surface, 60 outer peripheral wall surface, 261 dielectric multilayer film, 63 cover, 63a incident hole, DI, DI1, DH diameter

Claims (8)

A detection element (52) for detecting the amount of light;
It has openings (57a, 57b) at both ends, and includes cylindrical cylindrical portions (54, 254) in which the diameter (DI) of the inner peripheral hole (58) decreases toward the detection element,
The cylindrical portion is translucent, and incident light incident from the opposite side to the detection element is emitted to the outside of the cylindrical portion by reflection and reflected light collected toward the detection element by reflection. An optical sensor characterized by being divided into transmitted light. An incident hole (63a) smaller than the diameter (DI1) of the inner peripheral hole in the opening (57a) on the incident side,
The optical sensor according to claim 1, wherein the optical sensor is provided on an incident side with respect to the cylindrical portion. Furthermore, a cover (63) that covers the cylindrical portion via a space is provided,
The optical sensor according to claim 2, wherein the cover has the incident hole and absorbs the transmitted light. The cylindrical portion has a dielectric multilayer film (261) on at least one of the inner peripheral wall surface (259) and the outer peripheral wall surface (60),
The optical sensor according to any one of claims 1 to 3, wherein the dielectric multilayer film has a reflection characteristic in which a reflectance of visible light is higher than a reflectance of infrared light or ultraviolet light. .   5. The optical sensor according to claim 4, wherein the dielectric multilayer film has a film thickness corresponding to incident light incident obliquely with respect to a normal line direction of the inner peripheral wall surface. A head-up display device that is mounted on a moving body (2) and projects the image onto a projection surface (3a) of the moving body to display the image as a virtual image (7) so as to be visible from inside the moving body. There,
A detection element (52) for detecting the amount of light, and an opening (57a, 57b) at both ends, and a cylindrical tube portion (diameter of the inner peripheral hole (58) becomes smaller toward the detection element) 54, 254), the cylindrical portion is translucent, and the incident light incident from the side opposite to the detection element is reflected toward the detection element by reflection and transmitted. A light sensor (50, 250) that divides into transmitted light emitted to the outside of the cylindrical part by
And a control means (30) for controlling display of the virtual image based on a detection result of the photosensor. The mobile body has an instrument panel (4) and a front windshield (3),
The head-up display device according to claim 6, wherein the lensless inner peripheral hole is disposed toward the front windshield in the instrument panel. The cylindrical portion has a dielectric multilayer film (261) on at least one of the inner peripheral wall surface (59, 259) and the outer peripheral wall surface (60),
8. The head-up display device according to claim 6, wherein the dielectric multilayer film has a reflection characteristic in which a reflectance of visible light is higher than a reflectance of infrared light or ultraviolet light.

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