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` (19) Japan Patent Office (JP)
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`(12) Publication of Utility Model Application (U)
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`(11) Publication Number of Utility Model Application S62-167304
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`(43) Date of Publication of Application October 23, 1987
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`(51) Int. Cl.4 ID Symbol
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`Interoffice Reference Number
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`F 21 Q 1/00
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`B 60 Q 1/44
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`1/50
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`F 21 V 8/00
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`G 02 B 6/00
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`G 09 F 13/06
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`H-8212-3K
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` 8410-3K
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` 8410-3K
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`A-8212-3K
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`P-7370-2H
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` 6810-5C
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`Request for Examination not made ( pages in total)
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`(54) Title of Invention Display Device
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`(21) Utility Model Application S61-54739
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`(22) Application Date April 14, 1986
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`(72) Inventor Atsushi YAMADA
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`c/o Koito Manufacturing Co., Ltd., Shizuoka Plant
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`500, Kitawaki, Shimizu-shi, Shizuoka-ken
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`(72) Inventor Koichi SAKAKIBARA
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`c/o Koito Manufacturing Co., Ltd., Shizuoka Plant
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`500, Kitawaki, Shimizu-shi, Shizuoka-ken
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`(71) Applicant Koito Manufacturing Co., Ltd.
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`8-3, Takanawa 4-chome, Minato-ku, Tokyo
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`(74) Agent
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`Patent Attorney Masaki YAMAKAWA and 2 others
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`Page 1 of 11
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`TOYOTA EXHIBIT 1014
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`1. Title of the Invention
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`DISPLAY DEVICE
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`2. Claim
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`SPECIFICATION
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`A display device comprising: a housing; a light guiding plate that is
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`disposed in a front opening of the housing and provided with a display section
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`for letters, symbols, and the like with a reflection characteristic on an inner side;
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`a first light source disposed at rear inside of the housing to illuminate the light
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`guiding plate from behind; and a second light source that is disposed in an
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`incident section provided in an end surface of the light guiding plate, wherein
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`light emitted from the second light source enters the light guiding plate through
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`the incident section and is reflected to the front by the display section.
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`3. Detailed Description of the Invention
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`[Industrial Field of Application]
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`The invention relates to a display device suitably implemented as a
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`lamp such as that commonly referred to as a high mount stop lamp that is
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`disposed in a rear part of a vehicle body to issue a warning or the like to a
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`following vehicle.
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`[Prior Art]
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`A high mount stop lamp has been known as a display device that issues
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`a warning or the like to a following vehicle to ensure road traffic safety. This
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`lamp is disposed in a position near a rear window at the same height as a
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`driver's eyes, is brightly turned on together with a brake lamp during braking to
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`surely draw attention of the driver in a following vehicle for a purpose of
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`preventing a rear-end collision and the like, and is usually configured as shown
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`Page 2 of 11
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`in Fig. 5 and Fig. 6. Namely, a reference numeral 1 denotes a housing whose
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`front surface and bottom surface are opened, 2 denotes a surface lens
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`disposed in a front opening of the housing 1, 3 denotes a light source that is
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`disposed in the housing 1 and turned on during braking to illuminate the surface
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`lens 2 from behind, 4 denotes a reflector for reflecting the light emitted from the
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`light source 3 to the front, and 5 denotes a bottom plate for closing a bottom
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`opening of the housing 1. A high mount stop lamp 6 is configured by these
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`components and is disposed at an appropriate position on an inner surface of a
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`rear window 7 via a gasket (not shown) or the like. An inner surface of the
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`surface lens 2 is formed with a diffusion lens 8 that includes a number of small
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`convex lenses to diffuse the light from the light source 3.
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`[Problems that the Invention is to Solve]
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`In the conventional high mount stop lamp, the light source 3 is turned
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`on only when a brake pedal is depressed, and, at other times, remains turned
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`off and performs no function. Accordingly, the lamp is inconveniently given a
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`strong image as an obstacle that obstructs rear visibility.
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`[Means for Solving the Problems]
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`A display device according to the invention has been made to overcome
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`such inconvenience as described above, and thus is configured that a light
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`guiding plate is disposed in a front opening of a housing, an inner surface of the
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`light guiding plate being provided with a display section for letters, symbols, and
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`the like with a reflection characteristic and an end surface thereof being
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`provided with an incident section, that a first light source for illuminating the light
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`guiding plate from behind is disposed in the housing, that a second light source
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`is disposed in the incident section, and that the light emitted from this light
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`Page 3 of 11
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`source enters the light guiding plate through the incident section and is
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`reflected to the front by the display section.
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`[Operation]
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`In the invention, an entire surface of the light guiding plate is illuminated
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`when the first light source is turned on, and the light hits the display section and
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`is reflected to the front when the second light source is turned on, thereby
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`illuminating the display section. Therefore, the single display device can
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`selectively perform two different types of displaying.
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`[Embodiments]
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`The invention will hereinafter be described in detail on the basis of
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`embodiments shown in the drawings.
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`Fig. 1 is a cross-sectional view of an embodiment in which the invention
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`is applied to a high mount stop lamp, and Fig. 2 is a perspective view of a light
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`guiding plate. The same components as those in Fig. 5 and Fig. 6 are denoted
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`by the same reference numerals, and a description thereof will not be repeated.
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`In these drawings, while this embodiment differs from the conventional lamp
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`described above in points that a light guiding plate 10 is disposed in front of a
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`surface lens 2 in a front opening of a housing 1 and that second light sources
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`12a, 12b that differ from a light source (first light source) 3 for illuminating the
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`surface lens 2 are respectively disposed in a right and left pair of incident
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`sections 11a, 11b provided in a lower end surface of the light guiding plate 10,
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`the other configurations of this embodiment are substantially the same as those
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`of the conventional lamp.
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`The light guiding plate 10 is formed of a resin with superior
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`transparency, such as an acrylic resin, and an inner surface thereof is formed
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`Page 4 of 11
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`with letters, symbols, and the like, such as "GOOD BY", each of which is
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`formed by a number of stippling dots (small conical recesses), and constitutes a
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`display section 13. In this case, the light emitted from each of the second light
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`sources 12a, 12b respectively enters the light guiding plate 10 through each of
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`the incident sections 11a, 11b, and the light is reflected to the front by each of
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`the stippling dots. Accordingly, the display section 13 has a reflection
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`characteristic, by which the display section 13 is configured to be illuminated.
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`The high mount stop lamp that is configured just as described can
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`perform two different functions by lighting the first and second light sources 3,
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`12a, 12b as necessary. More specifically, when the first light source 3 is
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`turned on during braking, the light penetrates the surface lens 2 and the light
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`guiding plate 10 and is emitted to the outside. Accordingly, the entire surface
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`of the light guiding plate 10 is illuminated brightly, and issuance of a stop
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`warning (sign), which is a main function, is performed. At this time, the letters
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`in the display section 13 are not shown and thus cannot be read. On the other
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`hand, when the second light sources 12a, 12b are turned on, the display
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`section 13 is illuminated to allow the letters to be read as described above, and
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`thus a function to send a message to a following vehicle can be performed. In
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`this case, the second light sources 12a, 12b may be constantly turned on during
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`traveling, or may be turned on by a switch operation only when necessary. In
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`addition, in a case of constant lighting, a circuit may be configured such that the
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`second light sources 12a, 12b are automatically turned off once the first light
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`source 3 is turned on, so as not to adversely affect the stop sign function.
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`Furthermore, the second light sources 12a, 12b may flash to increase an effect
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`of the messaging function.
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`Page 5 of 11
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`Fig. 3 is a cross-sectional view of another embodiment of the invention,
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`and Fig. 4 is a perspective view of a light intensity controller. In this
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`embodiment, a filter 20 that is colored in an appropriate color to improve
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`visibility and fashionability of a message display is covered on a second light
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`source 12, an insertion hole 21 for inserting the light guiding plate 10 and a
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`freely openable and closable lid body 22 for closing the insertion hole 21 are
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`provided at a front end of an upper surface of the housing 1, and a light intensity
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`controller 23 and a smoke sheet 24 are respectively disposed in front of and at
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`rear of the light guiding plate 10.
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`As shown in Fig. 4, the light intensity controller 23 is formed in a blind
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`shape by vertically arranging a plurality of fine silicon rubber strips 27 at
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`specified intervals in a transparent silicon rubber sheet 26 and by integrating
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`front and back sides of the strips 27 by a polycarbonate film 28. An external
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`light 30 that enters the strips 27 at a large incident angle is blocked by the strips
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`27, thereby improving contrast of the display in the display section and
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`improving the visibility. Here, since the light from the first light source 3 or the
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`second light source 12 passes through a space between the adjacent strips 27
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`and is emitted to the outside, the light does not adversely affect the stop sign
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`function or the messaging function.
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`The smoke sheet 24 is formed of a transparent resin sheet that is
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`colored in a light transmissive dark color. It is done so for a purpose of
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`preventing a phenomenon that, in a case where the light from the second light
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`source 12 that has entered the light guiding plate 10 leaks to the surface lens 2
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`side and is reflected to the front by the lens 2 when a message is displayed, the
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`background of the message is colored in a color of the lens (red or the like).
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`Page 6 of 11
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`The light guiding plate 10 can freely be inserted in or removed from the
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`insertion hole 21 by opening the lid body 22 as shown by a dashed line. Thus,
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`if the plural light guiding plates with different message contents are prepared in
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`advance, the plate can freely be selected therefrom and switched.
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`In both of the above embodiments, a case where the display section 13
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`of the light guiding plate 10 is formed by the stippling dots has been described;
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`however, the invention is not limited thereto. The display section may be
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`formed by stippling lines, and specified letters, symbols, and the like may be
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`printed on a rear surface of the light guiding plate with a white ink or the like.
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`That is, any display section can be adopted as long as it has the reflection
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`characteristic for reflecting the light from the second light source to the front.
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`In addition, in both of the above embodiments, a case where the single
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`light guiding plate 10 is disposed has been described. However, if the plural
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`light guiding plates are disposed and superimposed on each other, and if the
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`second light source is arranged for each of the plates, multiple messages can
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`be displayed, and a message desired to be notified to the following vehicle can
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`freely be selected from a number of messages.
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`[Advantage of the Invention]
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`As it has been described so far, the display device according to the
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`invention can expand the function as a display device because the warning or
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`the like is issued by illuminating the light guiding plate from behind by the first
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`light source, the second light source is arranged in the incident section that is
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`provided in the end surface of the light guiding plate, the light emitted from this
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`light source enters the light guiding plate through the incident section, and this
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`incident light is reflected to the front by the display section, which is provided in
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`Page 7 of 11
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`the rear surface of the light guiding plate and has the reflection characteristic,
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`thereby illuminating the display section to display a message or the like.
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`4.Brief Description of the Drawings
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`Fig. 1 is a cross-sectional view of an embodiment in which the invention
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`is applied to a high mount stop lamp, Fig. 2 is a perspective view of a light
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`guiding plate, Fig. 3 is a cross-sectional view of another embodiment of the
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`invention, Fig. 4 is a light intensity controller, and Fig. 5 and Fig. 6 are an
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`external perspective view and a cross-sectional view
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`for showing a
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`conventional example of the high mount stop lamp.
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`1: housing
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`2: front surface lens
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`3: light source (first light source)
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`4: reflector
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`5: bottom plate
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`6: high mount stop lamp
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`7: rear window
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`10: light guiding plate
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`11, 11a, 11b: incident section
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`12, 12a, 12b: second light source
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`13: display section
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`23: light intensity controller
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`Applicant: Koito Manufacturing Co., Ltd.
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`Agent: Masaki Yamakawa (and 2 other persons)
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`Page 8 of 11
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`Agent Masaki Yamakawa
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`Page 9 of 11
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`Agent Masaki Yamakawa
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`Page 10 of 11
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`CERTIFICATE OF TRANSLATION
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`I, Takuya Takahashi, of Tokyo, Japan, hereby certify that I am conversant
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`in both Japanese and English and the following is,
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`to the best of my
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`knowledge and belief, a true and accurate translation of the original
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`document from Japanese to English.
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`I hereby acknowledge that any willful false statements and the like made in
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`this Declaration are punishable by fine or imprisonment, or both (1 8 U.S.C.
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`1001).
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`Furthermore,
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`I declare that all statements made of my own
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`knowledge are true and all statements made on information and belief are
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`believed to be true.
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`Translated Material: JP S62—167304U
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`Executed on this 13th day of January, 2015 at Tokyo, Japan.
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`WP
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`Takuya Takahashi
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`Page 11 of 11
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`Page 11 of 11
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