JP2011201352A - Display device for vehicle and method of manufacturing hologram - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a display device for a vehicle capable of displaying information of several kinds interlocking with the lighting of lights for a vehicle without obstructing a driver's visibility, and to provide a method of manufacturing a hologram film.SOLUTION: The display device 10 for a vehicle includes the hologram film 13 stuck on a window glass of an automobile, and a plurality of light sources 14, 15 which are arranged at a position that does not obstruct a driver's visibility in the cabin of the automobile and irradiate light to the hologram film. The display device is structured in such ways that each light source irradiates light at wavelength and/or an incidence angle different from each other to the hologram film and that the hologram film irradiates selectively in a predetermined direction the light of reproduction images of multiple display patterns 13a, 13b written in advance corresponding to the wavelength and/or incidence angle of the light from each light source.

Description

  The present invention relates to a vehicle display device using a hologram and a method for manufacturing the hologram.

  2. Description of the Related Art Conventionally, automobiles are equipped with a so-called high-mount stop lamp at the top of the vehicle body in order to improve visibility during braking. With this high-mount stop lamp, the driver of the following vehicle can quickly recognize that the driver of the car traveling ahead has stepped on the brake pedal, and can suppress sudden braking and in some cases rear-end collision. it can. However, when such a high mount stop lamp is provided in the vehicle interior, the light emitted from the high mount stop lamp may be reflected on the rear glass of the automobile. As a result, when the driver checks the rear view of the vehicle with a rearview mirror or the like, the rear view may be difficult to check due to the reflection of the high mount stop lamp on the rear glass.

  On the other hand, in Patent Document 1, a transparent hologram film is attached to the rear glass of an automobile, a light source is disposed at a position that does not obstruct the driver's line of sight, and this light source is interlocked with the lighting of the brake lamp. A stop lamp device is disclosed in which the hologram film is irradiated with light by being lit. Here, when light of a predetermined wavelength is incident from a predetermined angle, information for refracting the light in a predetermined direction is written on the hologram film. When the light source is turned on, the hologram film refracts the light from the light source and irradiates it backward. Accordingly, the driver of the following vehicle can visually recognize the refracted light from the hologram film and recognize that the driver of the automobile is stepping on the brake pedal. According to the stop lamp device having such a configuration, the hologram film and the light source do not hinder the rear view of the driver of the vehicle, so that the driver can have a rear view and high visibility with respect to the following vehicle can be obtained.

Japanese translation of PCT publication No. 01-502465

  By the way, in the stop lamp device according to Patent Document 1, the light irradiation through the hologram film is visually recognized by the driver of the succeeding vehicle as being lit in conjunction with the lighting of the brake light. The lighting state is the same as that of the brake light, that is, it is not lit when the driver of the vehicle is not stepping on the brake pedal, and is lit only when the brake pedal is pressed. . For this reason, even if the driver's brake pedal depression changes, the area of the hologram film simply appears to be lit, and the driver of the following vehicle Depending on the simulated lighting state of the hologram film, for example, it cannot be determined whether the vehicle is slowing down at a reduced speed or whether it is stopped, particularly suddenly stopped. Further, this stop lamp device is designed so that the simulated lighting state of the hologram film is switched only in conjunction with the brake light, and is not linked to the lighting state of other vehicle lamps such as a blinker and a hazard. Absent.

  On the other hand, when the vehicle is stopped, when the driver depresses the brake pedal, the brake lamp or the high-mount stop lamp provided at the rear of the vehicle body is merely lit regardless of the depression amount. Therefore, it is difficult for the driver of the following vehicle to determine whether the vehicle slows down at a reduced speed, or stops or suddenly stops. Especially on highways, the distance between vehicles may become long, so even if the car ahead approaches the traffic jam and steps on the brake pedal, it is difficult to judge whether the vehicle will run at a low speed or stop completely due to the traffic jam. In some cases, accidents may occur. For this reason, for example, when a plurality of types of display are performed according to the amount of depression of the brake pedal, it is possible to further ensure safety.

  Furthermore, apart from the original purpose of use, the car's hazard lamp flashes several times as a `` thank you hazard '' when it is given to the following vehicle when changing lanes, or there is a traffic jam ahead. May be lit to inform. However, since these lights are in the same blinking state as when they were originally used, the driver of the following vehicle must determine the surrounding conditions and determine the purpose of the hazard lamps. I had to. For this reason, if the purpose of lighting the hazard lamp can be supplementarily displayed when the hazard lamp is lit, it is possible to ensure safety.

  In view of the above, the present invention displays a plurality of types of information in conjunction with the lighting of a vehicle lamp such as a brake light or a direction indicator light without obstructing the field of view of the driver of the automobile with a simple configuration. It is an object of the present invention to provide a display device for a vehicle and a method for manufacturing a hologram thereof.

  According to the first aspect of the present invention, the above object is arranged in a hologram film affixed to a window glass of an automobile and a position that does not obstruct a driver's view in the interior of the automobile. A plurality of light sources for irradiating light, and each of the light sources is configured to irradiate the hologram film with light having a different wavelength and / or incident angle. The vehicle display device is characterized by selectively irradiating light of a plurality of display pattern images written in advance corresponding to the wavelength and / or incident angle of light from each light source in a predetermined direction. Achieved.

  In this first aspect, each light source is selectively driven to emit light toward the hologram film at a predetermined wavelength and direction, respectively. Thereby, the hologram film reproduces a display pattern corresponding to the light having the wavelength and direction from among the plurality of display patterns written in advance, and irradiates the display pattern image in a predetermined direction. Accordingly, by appropriately selecting the light source to be driven, it is possible to display a desired display pattern in a predetermined direction among a plurality of types of display patterns corresponding to the light from the light source. By using a plurality of light sources, a plurality of display patterns corresponding to the respective hologram films can be displayed by one hologram film, and a plurality of information can be notified in a predetermined direction.

  The vehicle display device according to a second aspect of the present invention is characterized in that in the vehicle display device according to the first aspect, each of the light sources is selectively driven based on vehicle information of the automobile. . The vehicle display device according to a third aspect of the present invention is the vehicle display device according to the first or second aspect, wherein the display pattern written on the hologram film is vehicle information of the automobile to which each light source relates. It is characterized by being set corresponding to In the second and third aspects, each light source is selectively driven based on the vehicle information, whereby the hologram film is irradiated with light from the selected light source. Thereby, the display pattern set corresponding to the vehicle information can be selectively displayed corresponding to the light from the light source.

  The vehicle display device according to a fourth aspect of the present invention is the vehicle display device according to the third aspect, wherein the hologram film is a volume hologram, and the written display pattern relates to each light source. In accordance with the vehicle information of the automobile, it is displayed with different lifting amounts. In the fourth aspect, in response to the vehicle information, for example, a more important display pattern is displayed with a larger floating amount, so that it is immediately determined that the information is more important just by visually recognizing the display pattern. It is possible to judge.

  The vehicle display device according to a fifth aspect of the present invention is the vehicle display device according to any one of the second to fourth aspects, wherein the vehicle information is hazard lamp lighting information of the automobile, and the hologram The display pattern written on the film selectively represents first information indicating an appreciation sign and second information indicating a traffic jam sign. In this fifth aspect, when the hazard lamp is turned on, the light source is selected and driven to display a display pattern that represents the purpose of use of the hazard lamp, that is, a first appreciation that is given by the lane change. In addition to turning on the hazard lamp, the driver of the following vehicle is notified of the more appropriate information by supplementarily displaying the following information or the second information that informs the following vehicle that there is traffic ahead. Can do.

  The vehicle display device according to a sixth aspect of the present invention is the vehicle display device according to any one of the second to fourth aspects, wherein the vehicle information is turn signal lamp lighting information of the automobile, and the hologram The display pattern written on the film selectively represents first information indicating a right turn and second information indicating a left turn. In the sixth aspect, when the blinker lamp is turned on, each light source is driven in conjunction with the blinker lamp to display a display pattern indicating a right turn or a left turn, that is, a first information indicating a right turn or a second pattern indicating a left turn. By displaying the information in an auxiliary manner, the driver of the succeeding vehicle can more clearly determine the right turn or the left turn than when only the blinker lamp is used.

  The vehicle display device according to a seventh aspect of the present invention is the vehicle display device according to any one of the second to fourth aspects, wherein the vehicle information is brake pedal depression amount information of the automobile, The display pattern written on the hologram film selectively represents first information representing normal braking and second information representing stronger braking. In the seventh aspect, when the brake pedal is depressed, in addition to the lighting of the brake lamp, a display corresponding to the depression amount of the brake pedal, that is, when the depression amount of the brake pedal is small, the first indicating the normal braking. When the amount of depression of the brake pedal is large due to sudden braking or the like, second information representing stronger braking is supplementarily displayed. As a result, the driver of the succeeding vehicle, in addition to turning on the brake lamp, visually recognizes the first display or the second display described above, so that the vehicle stops normally or stops suddenly. It is possible to immediately determine whether to do so, and more safety can be ensured.

  The vehicle display device according to an eighth aspect of the present invention is the vehicle display device according to the first aspect, wherein the display pattern written on the hologram film is notification information such as an advertisement, and a plurality of information is appropriately stored. Is selectively expressed. In this eighth aspect, by selectively driving each light source regardless of the driving of the automobile, the hologram film is irradiated with light from the selected light source, and a display pattern corresponding to the light is displayed from this light source. The Therefore, notification information such as a plurality of advertisements can be switched and displayed at predetermined time intervals, for example, and the advertisement effect can be further enhanced.

  According to a ninth aspect of the present invention, there is provided a hologram film affixed to a window glass of an automobile and a hologram film disposed at a position that does not obstruct a driver's view in the interior of the automobile. A plurality of light sources for irradiating the film with light, and each of the light sources irradiates the hologram film with light having a wavelength and / or an incident angle different from each other, and A method for manufacturing a hologram film in a display device for a vehicle, which selectively irradiates light of a plurality of display pattern images previously written corresponding to the wavelength / and / or incident angle of light from Using a two-beam optical system that irradiates object light and reference light onto a base film with a photosensitive material coated on the surface, Each display pattern is formed by projecting and exposing a dial image corresponding to a display pattern onto the photosensitive material, and causing reference light to enter the photosensitive agent at substantially the same incident angle θ as the light from the light source in use. Is achieved by a method for manufacturing a hologram film in a vehicle display device, which is manufactured by writing each of the above.

  In the ninth aspect, display patterns corresponding to light of different wavelengths and / or directions irradiated from a plurality of light sources can be written on the photosensitive material on the base film. Therefore, when light from the light source is incident on the hologram film at the same incident angle as the reference light, a display pattern corresponding to the light from the light source is reproduced, and is refracted by the hologram film in a predetermined direction. Irradiated. Therefore, by appropriately selecting and driving each light source, when the hologram film is irradiated with light from the driven light source, a display pattern corresponding to the light from this light source is reproduced, and this display pattern is in a predetermined direction. The content of the display pattern is visually notified as information. In this way, by selecting each light source, a display pattern including information corresponding to the selected light source is reproduced and irradiated in a predetermined direction, so a plurality of information is displayed by one hologram film. be able to.

  As described above, according to the present invention, with a simple configuration, a plurality of types of information display can be performed in conjunction with lighting of a vehicle lamp such as a brake light or a direction indicator light without obstructing the field of view of the driver of the automobile. Thus, there can be provided a display device for a vehicle and a method for producing a hologram thereof.

1 is a schematic side view showing the configuration of a first embodiment of a vehicle display device according to the present invention. It is a schematic rear view which shows the 1st display state of the display apparatus for vehicles of FIG. It is a schematic rear view which shows the 2nd display state of the display apparatus for vehicles of FIG. It is the schematic which shows the structure of the manufacturing apparatus of the hologram film in the display apparatus for vehicles of FIG. FIG. 5 is a schematic front view showing two dials used in the manufacturing apparatus of FIG. 4. It is a schematic side view which shows the structure of 2nd embodiment of the display apparatus for vehicles by this invention. It is a schematic side view which shows the 1st display state of the display apparatus for vehicles of FIG. It is a schematic side view which shows the 2nd display state of the display apparatus for vehicles of FIG. It is the schematic which shows the time of writing of the 1st display pattern of the manufacturing apparatus of the hologram film in the display apparatus for vehicles of FIG. It is a schematic front view which shows the 1st dial used with the manufacturing apparatus of FIG. It is the schematic which shows the time of the 2nd display pattern writing in the manufacturing apparatus of FIG. It is a schematic front view which shows the 2nd dial used with the manufacturing apparatus of FIG. It is a schematic side view which shows the structure of 2nd embodiment of the display apparatus for vehicles by this invention. It is a schematic rear view which shows the 1st display state of the display apparatus for vehicles of FIG. It is a schematic rear view which shows the 2nd display state of the display apparatus for vehicles of FIG. It is the schematic which shows the structure of the manufacturing apparatus of the hologram film in the display apparatus for vehicles of FIG. It is a schematic front view which shows the dial used with the manufacturing apparatus of FIG.

  Hereinafter, a preferred embodiment of the present invention will be described in detail with reference to FIGS. The embodiments described below are preferable specific examples of the present invention, and thus various technically preferable limitations are given. However, the scope of the present invention particularly limits the present invention in the following description. As long as there is no description of the effect, it is not restricted to these aspects.

  1 to 3 show the configuration of a first embodiment of a vehicle display device according to the present invention. In FIG. 1, a vehicle display device 10 includes a hologram film 13 affixed to a rear glass 12 of an automobile 11, a position that does not obstruct the driver's view in the interior of the automobile 11, and a rear seat or The two light sources 14 and 15 are arranged on the ceiling 11a of the luggage compartment.

  As is well known, the hologram film 13 is an optical functional film that refracts or reflects only light having a specific wavelength. In this case, when light from the light source 14 or 15 is incident at an incident angle θ, the light is refracted and a display pattern written in advance corresponding to each of the lights is reproduced to It is comprised so that it may irradiate toward. That is, as shown in FIG. 2, the hologram film 13 displays the first display pattern 13a of blue “Thank You” with a lift amount of about 20 cm by the light from the first light source 14. Further, as shown in FIG. 3, the hologram film 13 displays the second display pattern 13b, which is green “forward traffic jam”, with a lift amount of about 20 cm by the light from the second light source 15. The light sources 14 and 15 are arranged so that their optics intersect each other near the center of the hologram film 13. Here, the hologram film 13 is substantially transparent to visible light. For this reason, when the driver of the automobile 11 tries to confirm the rear view with the room mirror in the vehicle interior, the rear view is not hindered by the hologram film 13.

  Of the light sources 14 and 15, the first light source 14 is composed of an LED that emits light having a central wavelength of about 514 nm, for example, a GaN-based LED. The second light source 15 is composed of an LED that emits light having a central wavelength of about 488 nm, for example, a GaN-based LED. Each of the light sources 14 and 15 is attached to the passenger compartment ceiling 11a so as to be incident on the hologram film 13 attached to the rear glass 12 of the automobile 11 at an incident angle θ. The light sources 14 and 15 have their exit angles narrowed so that the entire emitted light beam is irradiated onto the hologram film 13. More specifically, each of the light sources 14 and 15 is configured by an LED having a bullet-shaped lens.

  Further, as shown in FIG. 1, the light sources 14 and 15 are connected to the drive circuit 16 via switches 14a and 15a, respectively. Here, each of the switches 14a and 15a is disposed near the hazard switch (not shown) of the automobile 11 at a position where the driver can easily operate. As a result, each light source 14 or 15 is driven by the drive circuit 16 when the driver operates the switch 14a or 15a, and emits light having a central wavelength of about 514 nm or 488 nm, respectively, to the hologram film 13. Irradiate.

  By the way, the hologram film 13 is manufactured as follows based on the first embodiment of the manufacturing method according to the present invention. FIG. 4 shows the configuration of the hologram film manufacturing apparatus. In FIG. 4, the hologram film manufacturing apparatus 20 is a two-beam optical system, and is reflected by a laser light source 21, a half mirror 22 as a light branching unit that branches light from the laser light source 21, and the half mirror 22. Mirror 23, convex lens 24, pinhole 25 and dial 26 sequentially arranged in the optical path of light L1 (object light), and sequentially arranged in the optical path of light L2 (reference light) transmitted through half mirror 22 And a mirror 27, a convex lens 28, and a pinhole 29.

  The laser light source 21 is an interference recording light source. In this case, an argon ion laser capable of selectively emitting blue light having a wavelength of about 488 nm and green light having a wavelength of about 514 nm is used.

  The half mirror 23 is arranged at an angle of 45 degrees with respect to the optical axis of the light from the laser light source 21, and the light from the laser light source 21 is referred to as object light L1 as reflected light and transmitted light. The light is branched to light L2. Instead of the half mirror 23, other types of light branching means such as a beam splitter may be used.

  The object light L1 has its optical path bent 90 degrees by the mirror 23, converged by the convex lens 24, then narrowed down by the pinhole 25, and a position separated from the display pattern image written on the dial 26 by the distance d. Projection is performed on the base film 30 arranged perpendicularly to the base film 30. On the other hand, the optical path of the reference light L2 is similarly bent by the mirror 27, converged by the convex lens 28, narrowed down by the pinhole 29, and incident on the base film 30 at an incident angle θ. Here, the mirror 27 described above is arranged at an inclination angle such that the incident angle of the reference light L2 to the base film 30 is θ. Here, the incident angle θ is set to be the same as the incident angle θ of light from the light sources 14 and 15 when the hologram film 13 is attached to the rear glass 12 of the automobile 11.

  The dial 26 has cutout portions such as characters and designs corresponding to the display pattern to be written on the hologram film. Here, the dial 26 is specifically configured by disposing a light-transmitting film in other portions while disposing a light-transmitting film in portions such as characters and designs. Yes. In this case, two types of dials 26 are prepared for each of the light sources 14 and 15, and the first type of dial 26a corresponds to a display pattern for the light source 14, as shown in FIG. The shape of the character string “Thank You” is cut out. Further, as shown in FIG. 5B, the second type of dial 26 b is cut out in the shape of a character string “forward traffic jam” corresponding to the display pattern for the light source 15.

  The base film 30 is made of a translucent material, and a photosensitive material 31 is coated on the surface thereof. As the photosensitive material 31, a photosensitive monomer, specifically, a photopolymer having sensitivity to the wavelengths of blue light (488 nm) and green light (514 nm) described above is used. More specifically, for example, a photopolymer such as a photopolymer Omnidex manufactured by DuPont is used as the photosensitive material, but other photopolymers, silver salt emulsions, and the like can also be used. In addition, the photopolymer Omnidex made by DuPont can increase the diffraction efficiency by heat treatment at 120 ° C. for about 2 hours.

  Using such a hologram film manufacturing apparatus 30, the hologram film is manufactured as follows. That is, first, the first dial 26a is used as the dial 26, the distance d between the base film 30 and the dial 26a is 20 cm, the laser light source 21 is adjusted, and blue light (488 nm) is emitted. Let As a result, the character string “Thank You” on the first dial 26a is projected onto the photosensitive material 31 on the base film 30, and the photosensitive material 31 is exposed.

  Next, the second dial 26b is used as the dial 26, the distance d between the base film 30 and the dial 26b is set to 20 cm as it is, the laser light source 21 is adjusted, and green light (541 nm) is emitted. Let it emit. Thereby, the character string “forward traffic jam” on the second dial 26 b is projected onto the photosensitive material 31 on the base film 30, and the photosensitive material 31 is exposed. In the above-described two exposures, the light intensity ratio between the reference light L2 and the object light L1 is preferably about 2: 1 to 10: 1. Thereby, both exposures are performed in a well-balanced manner, and two display patterns on the completed hologram film 13 are formed in the same manner. In the two exposures, the sum of the light intensities of the reference light L2 and the object light L1 is 1 mJ / cm 2 and irradiation is performed for 30 seconds.

  Thereafter, the photosensitive material 31 is developed together with the base film 30 to produce the hologram film 13 on which the two character strings are written.

  The vehicle display device 10 according to the present invention is configured as described above, and operates as follows. In FIG. 1, when the vehicle 11 is traveling, for example, when a lane change is given to a succeeding vehicle, as a sign of thanks to the driver of the succeeding vehicle, when the hazard lamp blinks several times, the driver The operation switch 14a is operated together with the switch. As a result, the first light source 14 is driven by the drive circuit 16 and emits blue light having a central wavelength of about 488 nm. Accordingly, since this blue light is incident on the hologram film 13 at an incident angle θ, the character string of the display pattern “Thank You” corresponding to this blue light is reproduced as shown in FIG. Irradiated towards. The driver of the following vehicle observes the above-described blue display pattern “Thank You” 13a on the rear glass 12 of the automobile 11 with the distance d (= 20 cm) raised. Therefore, the driver of the following vehicle can immediately determine that the car 11 blinks the hazard lamp several times as a thank-you sign (thank you hazard).

  On the other hand, when the vehicle 11 is traveling, the driver operates the operation switch 15a together with the hazard switch when blinking the hazard lamp in order to inform the following vehicle that the front is congested. As a result, the second light source 15 is driven by the drive circuit 16 and emits green light having a central wavelength of about 514 nm. Accordingly, since this green light is incident on the hologram film 13 at an incident angle θ, as shown in FIG. 3, the character string of the display pattern “forward traffic jam” corresponding to the blue light is reproduced, Irradiated towards. The driver of the following vehicle observes the green display pattern “forward traffic jam” 13b described above on the rear glass 12 of the automobile 11 in a state where it is lifted by a distance d (= 20 cm). Therefore, the driver of the following vehicle can immediately determine that the automobile 11 is blinking the hazard lamp as a traffic jam sign.

In this case, the display pattern 13a of “Thank You” is displayed in blue and the display pattern 13b of “forward traffic jam” is displayed in green. However, the display pattern 13a is not limited to this, and may be reversed. However, in general, holograms tend to produce a brighter reproduced image with respect to green light. For information that is more important to subsequent vehicles, such as traffic signs, it is brighter and more visible. It is preferable to set a display pattern corresponding to. The display patterns 13a and 13b are written on one photosensitive material 31 having sensitivity to blue light and green light. However, the present invention is not limited to this, and a photosensitive material having sensitivity to each color light is applied to the base film 30. You may make it laminate | stack.

  6 to 8 show the configuration of the second embodiment of the vehicle display device according to the present invention. In FIG. 6, the vehicle display device 60 includes a hologram film 41 attached to the rear glass 12 of the automobile 11, a position that does not obstruct the driver's view in the passenger compartment of the automobile 11, And two light sources 42 and 43 arranged on the vehicle interior ceiling 11a of the luggage compartment.

  The hologram film 41 refracts the light when the light from the light source 42 is incident at the incident angle θ1 or the light from the light source 43 at the incident angle θ2, and corresponds to each of these lights in advance. The written display pattern is reproduced and irradiated toward the rear of the automobile 11. That is, as shown in FIG. 7, when the red light from the first light source 42 is incident at an incident angle θ1, the hologram film 41 lifts the first display pattern 41a of red “STOP” by 20cm. Display in degree. When the red light from the second light source 43 is incident at an incident angle θ2, the hologram film 41 lifts the second display pattern 42b having a larger “STOP” by 50 cm as shown in FIG. Display in degree. The light sources 42 and 43 are arranged so that their optics intersect each other near the center of the hologram film 41. Here, the hologram film 41 is substantially transparent to visible light. For this reason, when the driver of the automobile 11 tries to confirm the rear view with the room mirror in the vehicle interior, the rear view is not hindered by the hologram film 41.

  The light sources 42 and 43 are both LEDs that emit light having a central wavelength of about 647 nm, for example, GaAs LEDs. And the 1st light source 42 is attached to the compartment ceiling 11a so that it may inject with respect to the hologram film 41 affixed on the rear glass 12 of the motor vehicle 11 with incident angle (theta) 1. On the other hand, the second light source 43 is attached to the passenger compartment ceiling 11a so as to enter the hologram film 41 attached to the rear glass 12 of the automobile 11 at an incident angle θ2. The light sources 42 and 43 have their exit angles narrowed so that the entire emitted light beam is irradiated onto the hologram film 41. That is, more specifically, each of the light sources 42 and 43 is configured by an LED having a bullet-shaped lens.

  Further, the light sources 42 and 43 are connected to a control circuit 44 as shown in FIG. Here, when the signal S relating to the brake pedal depression amount is input as vehicle information of the automobile 11, the control circuit 44 drives the first light source 42 when the brake pedal depression amount is smaller than the threshold value, and the brake circuit When the pedal depression amount is larger than the threshold value, the second light source 43 is driven. As a result, of the light sources 42 or 43, the first light source 42 is driven when the brake pedal depression amount is small, and the second light source 43 is driven when the brake pedal depression amount is large. Red light having a wavelength of about 647 nm is emitted and applied to the hologram film 41.

  By the way, the hologram film 41 is manufactured as follows based on the second embodiment of the manufacturing method according to the present invention. FIG. 9 shows the configuration of the hologram film manufacturing apparatus. 9, the hologram film manufacturing apparatus 50 has substantially the same configuration as that of the hologram film manufacturing apparatus 20 shown in FIG. 4, and therefore the same components are denoted by the same reference numerals and description thereof is omitted. Here, the hologram film manufacturing apparatus 50 is different from the hologram film manufacturing apparatus 20 shown in FIG. 4 only in the following points. That is, in this case, a laser light source 51 is provided instead of the laser light source 21, and the optical path after the mirror 27 of the reference light L2 is swung as shown in FIG. The distance between the board 26 and the base film 30 can be changed from d1 (= 20 cm) to d2 (= 50 cm).

  As the laser light source 51, a krypton laser capable of emitting red light having a wavelength of about 647 nm is used.

  The mirror 27, the convex lens 28, and the pinhole 29 are supported so as to be able to swing around the optical axis of the mirror 27 from the position shown in FIG. 9 to the position shown in FIG. The optical path from 27 to the base film 30 through the convex lens 28 and the pinhole 25 is oscillated. Similarly, the optical path of the reference light L2 is bent by the mirror 27, converged by the convex lens 28, narrowed down by the pinhole 29, and incident on the base film 30 at an incident angle θ1 or θ2. Here, the incident angles θ1 and θ2 are set to be the same as the incident angles θ1 and θ2 of light from the light sources 42 and 43 when the hologram film 41 is attached to the rear glass 12 of the automobile 11.

  Two types of the dial 26 are prepared for each of the light sources 42 and 43, and the first type of dial 26c is a character string “STOP” corresponding to a display pattern for the light source 42 as shown in FIG. It is cut out in the shape of Further, as shown in FIG. 12, the second type dial 26 d is cut out in a shape of a character string “STOP” corresponding to a display pattern for the light source 43. The character string “STOP” on the dial 26d is defined by a larger font than the character string “STOP” on the dial 26c.

  In this case, the photosensitive material 31 applied to the base film 30 is a photopolymer having sensitivity to the wavelength of red light (647 nm) described above.

  Using such a hologram film manufacturing apparatus 50, the hologram film is manufactured as follows. That is, first, the first dial 26c is used as the dial 26, and the distance d1 between the base film 30 and the dial 26c is set to 20 cm, and the laser light source 51 emits red light (647 nm). As a result, the character string “STOP” on the first dial 26 c is projected onto the photosensitive material 31 on the base film 30, and the photosensitive material 31 is exposed.

  Next, the second dial 26d is used as the dial 26, and the distance d2 between the base film 30 and the dial 26d is 50 cm, and the laser light source 51 emits red light (647 nm). As a result, a larger “STOP” character string on the second dial 26 c is projected onto the photosensitive material 31 on the base film 30, and the photosensitive material 31 is exposed. Other conditions are the same as in the case of manufacturing the dials 26a and 26b described above.

  Thereafter, the photosensitive material 31 is developed together with the base film 30 to produce the hologram film 41 in which the two character strings are written.

  The vehicle display device 40 according to the present invention is configured as described above and operates as follows. When the driver depresses the brake pedal while the vehicle 11 is traveling, the control circuit 44 selectively drives and controls the light sources 42 and 43 according to the amount of depression. That is, when the amount of depression of the brake pedal is small, the first light source 42 is driven. As a result, the first light source 42 emits red light having a central wavelength of about 647 nm. Accordingly, since the red light is incident on the hologram film 41 at the incident angle θ1, the character string of the display pattern “STOP” corresponding to the red light at the incident angle θ1 is reproduced as shown in FIG. 11 is irradiated toward the rear. The driver of the following vehicle observes the display pattern “STOP” 41a described above on the rear glass 12 of the automobile 11 with the distance d1 (= 20 cm) raised. Therefore, the driver of the following vehicle can immediately determine that the brake pedal depression amount of the automobile 11 is small.

  On the other hand, when the brake pedal depression amount of the automobile 11 is large, the control circuit 44 drives the second light source 43. Thereby, the second light source 43 emits red light having a central wavelength of about 647 nm. Therefore, since this red light is incident on the hologram film 41 at an incident angle θ2, as shown in FIG. 8, a character string of a larger typeface display pattern “STOP” corresponding to the red light at the incident angle θ2 is displayed. It is regenerated and irradiated toward the rear of the automobile 11. The driver of the following vehicle observes on the rear glass 12 of the automobile 11 in a state where the above-described larger typeface display pattern “STOP” 41b is lifted by a distance d2 (= 50 cm). Therefore, the driver of the following vehicle can immediately determine that the brake pedal depression amount of the automobile 11 is large.

  In this case, the “STOP” display pattern 41a of a small typeface is displayed with a lifting amount of about 20 cm, and the “STOP” display pattern 41b of a large typeface is displayed with a lifting amount of about 50 cm. It is not limited and may be reversed. However, when the information that is more important to the following vehicle, that is, when the amount of depression of the brake pedal is large, it is preferable to increase the floating amount of the display pattern 41b of the large typeface “STOP”.

  Furthermore, since the hologram film 30 can write distance d (d1, d2) as distance information (depth) as a so-called volume hologram, it is possible to display the display patterns 41a, 41b taking advantage of the difference in depth. The second light source 43 for the second display pattern 41b is arranged at a position farther from the hologram film 41, and the second light source 43 is incident at an incident angle θ2 closer to the normal direction with respect to the hologram film 41. The light source 43 is configured to make light incident. Thereby, the second display pattern 41b can be easily reproduced as a more lifted image, and even if the directivity is strong, it is possible to easily irradiate light to the driver's field of view of the following vehicle.

  13 to 15 show the configuration of the third embodiment of the vehicle display device according to the present invention. In FIG. 13, the vehicle display device 60 includes a hologram film 61 attached to the rear glass 12 of the automobile 11, a position that does not obstruct the driver's view in the interior of the automobile 11, A plurality of (four in the case of illustration) light sources 62 (see FIGS. 14 and 15) arranged on the vehicle interior ceiling 11a of the luggage compartment.

  When the light from each light source 62 (62a, 62b, 62c, 62d) is incident at an incident angle θ, the hologram film 61 refracts the light and writes a plurality of pieces written in advance corresponding to the light. The display patterns for right / left turn display are selectively reproduced and irradiated toward the rear of the automobile 11. Here, the hologram film 61 includes one display pattern corresponding to each of the plurality of light sources 62 described above. That is, when displaying a left turn, the hologram film 61 first displays a first display pattern 61a of an amber “left arrow mark” by light from a light source 62b closer to the center left as shown in FIG. The display is displayed with a lifting amount of about 20 cm, and then the second display pattern 61b of the amber color “left arrow mark” is displayed with a lifting amount of about 20 cm by the light from the left end light source 62a. One display pattern 61a and second display pattern 61b are alternately displayed. Here, the hologram film 61 is substantially transparent to visible light. For this reason, when the driver of the automobile 11 tries to confirm the rear view with the room mirror in the vehicle interior, the rear view is not hindered by the hologram film 61.

  The light source 62 (62a, 62b, 62c, 62d) is an LED that emits amber light, or a green LED that emits light having a central wavelength of about 514 nm and 647 nm as a mixed color. It consists of a red LED. As shown in FIG. 13, each light source 62 (62a, 62b, 62c, 62d) is incident on the hologram film 13 affixed to the rear glass 12 of the automobile 11 at an incident angle θ. It is attached to the room ceiling 11a. In addition, each light source 62 (62a, 62b, 62c, 62d) has its exit angle narrowed so that the entire emitted light beam is irradiated onto the corresponding display pattern region of the hologram film 13. That is, more specifically, each light source 62 (62a, 62b, 62c, 62d) is configured by an LED having a bullet-shaped lens.

  Furthermore, each light source 62 (62a, 62b, 62c, 62d) is connected to the control circuit 63 as shown in FIG. Here, the control circuit 63 receives a signal Sw relating to blinker lamp lighting as vehicle information of the automobile 11, and when the left blinker lamp is illuminated, the left light sources 62a and 62b are alternately used or the right blinker lamp is switched on. At the time of lighting, the right light sources 62c and 62d are alternately driven and controlled. Thereby, among the light sources 62, the left light sources 62a and 62b are alternately driven when the automobile 11 is turned left, and the right light sources 62c and 62d are alternately driven when the automobile 11 is turned right. Each amber color light is emitted and irradiated toward the corresponding region of the hologram film 61.

  The hologram film 61 is manufactured as follows based on the third embodiment of the manufacturing method according to the present invention. FIG. 16 shows the configuration of the hologram film manufacturing apparatus. In FIG. 16, the hologram film manufacturing apparatus 70 has substantially the same configuration as that of the hologram film manufacturing apparatus 20 shown in FIG. 4, so the same components are denoted by the same reference numerals and description thereof is omitted. Here, the hologram film manufacturing apparatus 70 is different from the hologram film manufacturing apparatus 20 shown in FIG. 4 only in the following points. That is, in this case, a laser light source 71 is provided instead of the laser light source 21. As the laser light source 71, an argon ion laser that emits green light having a wavelength of 514 nm and a krypton laser that emits red light having a wavelength of 647 nm are used in combination.

  In this case, one type of the dial plate 26 is prepared, and the dial plate 26e has a hollow portion having a shape corresponding to the same “arrow mark” display pattern for each of the light sources 62a, 62b, 62c, and 62d. is doing.

  In this case, a photopolymer having sensitivity to the wavelengths of green light and red light is used as the photosensitive material 31 applied to the base film 30.

  Using such a hologram film manufacturing apparatus 30, the hologram film is manufactured as follows. That is, first, the dial 26e is used as the dial 26, the distance d between the base film 30 and the dial 26e is set to 20 cm, and an argon ion laser is oscillated as a laser light source 71 at a wavelength of green light. Green light (514 nm) is emitted. As a result, the “arrow mark” on the dial 26e is projected onto the photosensitive material 31 on the base film 30, and the photosensitive material 31 is exposed. Subsequently, as the laser light source 71, the argon ion laser is changed to a krypton laser to emit red light (617 nm). As a result, the “arrow mark” on the dial 26e is projected onto the photosensitive material 31 on the base film 30, and the photosensitive material 31 is exposed.

  Thereafter, the photosensitive material 31 is developed together with the base film 30 to produce the hologram film 61 on which the “arrow mark” is written. Similarly, the hologram film 61 on which the same “arrow mark” is written is produced again. As shown in FIG. 14, the two hologram films 61 produced in this way are attached side by side in the horizontal direction, for example, on the left half of the rear glass 12 of the automobile 11.

  Next, in the hologram film manufacturing apparatus 70 described above, the dial 26e is rotated 180 degrees as the dial 26, and the exposure is performed twice in the same manner, whereby the hologram film on which the opposite “arrow mark” is written is written. Two pieces of 61 are produced. Then, as shown in FIG. 14, the two hologram films 61 are pasted side by side in the horizontal direction, for example, on the right half of the rear glass 12 of the automobile 11.

  In this way, as shown in FIG. 14, the display patterns “left arrow marks” 61a and 61b and the display patterns “right arrow marks” 61c and 61d are arranged in order from the left side on the rear glass 12 of the automobile 11. Will be. In the illustrated case, each display pattern 61 a, 61 b, 61 c, 61 d is provided on one hologram film 61. However, the present invention is not limited to this, and all the display patterns 61 a, 61 a, 61b, 61c, 61d may be formed.

  The vehicle display device 60 according to the present invention is configured as described above and operates as follows. In FIG. 1, when the vehicle 11 travels, for example, when the driver turns the left lane or changes the left lane, the driver operates the blinker switch to turn on the left blinker lamp, and the control circuit 63 alternately turns the left light sources 62b and 62a. Drive control. As a result, the light source 62b first emits amber light, and the amber light is incident on the corresponding hologram film 61 at the incident angle θ. Therefore, as shown in FIG. A display pattern “left arrow mark” 61b corresponding to the color light is reproduced and irradiated toward the rear of the automobile. Thereafter, the light source 62a emits light of amber color, and the light of the amber color is incident on the corresponding hologram film 61 at the incident angle θ. Therefore, as shown in FIG. A display pattern “left arrow mark” 61 a corresponding to the light is reproduced and irradiated toward the rear of the automobile 11.

  Accordingly, the driver of the following vehicle is alternately displayed on the rear glass 12 of the automobile 11 in a state where the amber display patterns “left arrow mark” 61b and 61a are lifted by a distance d (= 20 cm). Will be observed. Accordingly, the driver of the following vehicle can more clearly and immediately determine that the automobile 11 is turning on the left turn signal lamp for the left turn or the left lane change.

  In addition, when the automobile 11 turns right or changes the right lane, the light sources 62c and 62d are driven and controlled in the same manner, and the amber light from the light sources 62c and 62d becomes the right region of the rear glass 12 of the automobile 11. , The display patterns “right arrows” 61 c and 61 d corresponding to the amber light are alternately reproduced and irradiated toward the rear of the automobile 11. As a result, the driver of the following vehicle is alternately displayed on the rear glass 12 of the automobile 11 in a state where the amber display patterns “right arrow mark” 61c and 61d are lifted by a distance d (= 20 cm). Will be observed. Accordingly, the driver of the following vehicle can more clearly and immediately determine that the automobile 11 is turning on the right turn signal lamp for the right turn or the right lane change.

  In this case, the light source 62 is configured by combining a red LED and a green LED in order to emit amber light, but the present invention is not limited to this, and an amber LED can also be used. Similarly, the laser light source 71 in the hologram film manufacturing apparatus 70 may be a laser that emits amber light, for example, a dye laser.

  In the above-described embodiment, each hologram film 13, 41, 61 uses the dial 26 to write the display pattern. However, the present invention is not limited to this, and for example, character information is obtained using a computer generated hologram. You may make it produce the hologram film which has the display pattern included.

  In the above-described embodiment, the hologram films 13, 41, 61 are manufactured by the hologram film manufacturing apparatuses 20, 50, 70, respectively, but not limited thereto, these hologram film manufacturing apparatuses 20, 50, 70 A master may be prepared by 70, and the hologram films 13, 41, 61 as replicas thereof may be manufactured based on the master. The manufacturing method of the hologram films 13, 41, 61 using such a master is suitable for mass production.

  Furthermore, in the hologram film manufacturing apparatuses 20, 50, and 70 described above, the object light L1 is incident on the base film 30 from the normal direction, but may be incident obliquely. In this case, it is desirable that the object light L1 is incident with an inclination corresponding to the inclination angle of the rear glass 12 of the automobile 11.

  In the above-described embodiment, the dial 26 is provided with a scattering film in a hollow portion corresponding to a character portion to be displayed. The scattering film is observed as a less irritating image when the driver of the succeeding vehicle visually recognizes the display pattern of the hologram film 13, 41, 61 as the scattering degree increases, and the scattering degree decreases as the scattering degree decreases. Observed as a strong image of a certain stimulus. Therefore, for example, in the vehicular display device 10 shown in FIG. 1, when writing the display pattern 13a as a gratitude sign on the photosensitive material 31, a scattering film having a large scattering degree, for example, a Haze value, is formed on the hollow portion of the dial 26. When a display film 13b as a traffic jam sign is written on the photosensitive material 31, a scattering film having a low scattering degree, for example, a scattering film having a haze value of about 30 to 60 is used. It is preferable. Further, in the vehicle display device 60 shown in FIG. 6, when writing the display pattern 41a when the brake pedal depression amount is small on the photosensitive material 31, a scattering film having a low scattering degree is formed on the hollowed portion of the dial 26, For example, when a scattering film having a haze value of approximately 30 to 60 is used and the display pattern 41b when the brake pedal depression amount is large is written on the photosensitive material 31, a scattering film having a smaller scattering degree, for example, a haze value is approximately. It is preferable to use about 10 to 30 scattering films. When the scattering degree of the scattering film is small, the directivity due to the scattering degree of the reproduced image of each display pattern of the hologram film 13, 41, 61 is increased. Accordingly, it is necessary to appropriately select the incident angle of the object light L1 on the photosensitive material 31 in the hologram film manufacturing apparatuses 20, 50, and 70 so that the directivity range is within the field of view of the driver of the following vehicle.

  In the above-described embodiments, each display pattern is displayed to the driver of the following vehicle by attaching a hologram film to the rear glass 12 of the automobile 11 and arranging a light source on the ceiling of the passenger compartment. However, the present invention is not limited to this, and can be arranged in other places. For example, the light source is not limited to the ceiling of the passenger compartment, and can be arranged at any position as long as it does not interfere with the driver's view. At that time, it is desirable that other light sources and disturbance light such as sunlight do not enter the hologram film. Further, the position where the hologram film is pasted is not limited to the rear glass 12 of the automobile 11, but may be pasted on the side window glass as an advertising medium, for example, in a bus or taxi.

  Furthermore, in the above-described embodiment, the light sources 14, 15, 42, 43, and 62 all have a constant intensity of emitted light. In order to improve the visibility for the driver of the following vehicle, for example, the light intensity may be increased in a bright environment such as daytime, and the light intensity may be decreased in a dark environment such as nighttime.

  In this way, according to the present invention, with a simple configuration, a plurality of types of information display can be performed in conjunction with the lighting of a vehicle lamp such as a brake light and a direction indicator light without disturbing the field of view of the driver of the automobile. It is possible to provide a vehicular display device and a method for manufacturing a hologram thereof.

10, 60, 70 Display device for vehicle 11 Automobile 12 Rear glass 13, 41, 61 Hologram film 13a, 13b, 41a, 41b, 61a, 61b, 61c, 61d Display pattern 14, 15, 42, 43, 62, 62a, 62b , 62c, 62d Light source 14a, 14b Operation switch 16 Drive circuit 20 Hologram film manufacturing apparatus 21, 51, 71 Laser light source 22 Half mirror (light branching means)
23, 27 Mirror 24, 28 Convex lens 25, 29 Pinhole 26, 26a, 26b, 26c, 26d, 26e Dial 30 Base film 31 Photosensitive material 44, 63 Control circuit

Claims (9)

Hologram film affixed to the window glass of a car,
A light source that is disposed at a position that does not obstruct the driver's field of view in the interior of the automobile, and that irradiates the hologram film with light; and
The light source is configured to irradiate the hologram film with light at different wavelengths and / or incident angles,
The hologram film selectively irradiates light of a reproduction image of a plurality of display patterns written in advance corresponding to the wavelength and / or incident angle of light from each light source in a predetermined direction, Vehicle display device.   The vehicle display device according to claim 1, wherein each of the light sources is selectively driven based on vehicle information of the automobile.   The vehicle display device according to claim 1, wherein the display pattern written on the hologram film is set in accordance with vehicle information of the automobile related to each light source.   4. The hologram film according to claim 3, wherein the hologram film is a volume hologram, and the written display pattern is displayed with a different lifting amount corresponding to the vehicle information of the automobile related to each light source. The vehicle display device described in 1.   The vehicle information is hazard lamp lighting information of the automobile, and the display pattern written on the hologram film selectively selects first information indicating a gratitude sign and second information indicating a traffic jam sign. The vehicle display device according to claim 2, wherein the display device is a vehicle display device.   The vehicle information is turn signal lamp lighting information of the automobile, and the display pattern written on the hologram film selectively represents first information indicating a right turn and second information indicating a left turn. The vehicular display device according to any one of claims 2 to 4, wherein   The vehicle information is brake pedal depression amount information of the automobile, and the display pattern written on the hologram film includes first information representing normal braking and second information representing stronger braking. The vehicle display device according to any one of claims 2 to 4, wherein the vehicle display device is selectively represented.   The vehicle display device according to claim 1, wherein the display pattern written on the hologram film is notification information such as an advertisement and selectively represents a plurality of information as appropriate. A hologram film affixed to a window glass of an automobile, and a plurality of light sources that are arranged at positions that do not obstruct a driver's view in the interior of the automobile and that irradiate the hologram film with light. Each of the light sources irradiates the hologram film with light having a different wavelength and / or incident angle, and the hologram film is written in advance corresponding to the wavelength / and / or incident angle of the light from each light source. A method for manufacturing a hologram film in a vehicle display device that selectively irradiates light of a plurality of display pattern images in a predetermined direction,
The hologram film uses a two-beam optical system for irradiating object light and reference light to a base film having a photosensitive material coated on the surface, and the dial corresponding to each display pattern is exposed to light by the object light. It is manufactured by projecting onto a material and exposing it, and by making reference light enter the photosensitive agent at substantially the same incident angle θ as the light from the light source in use and writing each display pattern. A method for producing a hologram film in a vehicle display device.

Images