JP2001126249A - Navigation device - Google Patents

Abstract

(57) [Summary] [PROBLEMS] To provide a navigation device capable of recording destination information on an optical disc on which map information and the like are recorded. SOLUTION: In an optical recording medium 1, map information and the like are recorded in a read-only information recording layer 11 and an information recording layer 12, and destination route information is recorded in a recordable / reproducible information recording layer 13. Therefore, guidance is performed based on this information.

Description

DETAILED DESCRIPTION OF THE INVENTION

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a navigation apparatus using an information recording medium having a read-only information recording layer on which map information and the like are recorded and an information recording layer on which destination information can be recorded and reproduced.

2. Description of the Related Art An optical disk having a thickness of about 1.2 mm, such as a CD-ROM, from which information is read using a semiconductor laser is provided. In this type of optical disk, focus servo and tracking servo are performed on a pickup objective lens to irradiate a pit row on a signal recording surface with a laser beam to reproduce a signal. Recently, the recording density for recording a long moving image has been increasing.
For example, a DVD standard has been proposed in which information of 4.7 Gbytes is recorded on one side of an optical disk having a diameter of 12 cm, which is the same as a CD-ROM. DVD disc thickness is about 0.6m
m, and 9.4 Gbyte information can be recorded on one sheet by laminating both sides. In addition, the wavelength of a laser beam used for signal reproduction has been shortened, and a blue laser having a wavelength of 430 to 480 nm, which is shorter than a laser beam having a wavelength of 635 nm, which is mainly used at present, has been developed. Therefore, the future DV
It is expected that a next-generation DVD having smaller pits and a smaller track pitch than D will be put to practical use, and the distance from the substrate surface to the signal recording surface will be 0.6 mm or less. Further, optical disks capable of recording and / or reproducing signals include a magneto-optical recording medium and a phase change disk. Therefore, in the future, as a read-only optical disk, C
It is expected that D, DVD, and next-generation DVD, magneto-optical recording media as recordable optical disks, and phase change disks will exist.

However, at present, there is no optical disc having a read-only information recording layer and a recordable information recording layer on one optical disc. In addition, in the optical disc used for the car navigation system, it is troublesome to perform the operation of inputting the destination point while driving since the destination point is input before the destination point is input and the map is displayed on the screen. It is not preferable in terms of safety. In the future, DVD players and next-generation DV
Since it is possible that there is a D player,
There is a need to provide an optical disc that allows a player to record and / or reproduce signals. Therefore, the present invention solves such a problem, and can record personal information on an optical disc on which a map or the like is recorded in a car navigation system, and can record and / or reproduce signals even with a player of lower quality than a next-generation DVD player. It is an object to provide a possible optical recording medium.

In order to solve the above-mentioned problems, a navigation device according to the present invention is provided at a first distance from a substrate surface on which a laser beam is incident, and has a read-only structure in which at least map information is recorded. An information recording layer, an information recording medium having an information recording layer provided at a second distance from the substrate surface on which the laser beam is incident and capable of recording and reproducing information, and a unit for recording and reproducing the recording medium;
Input means for inputting information to be recorded on the information recording layer capable of recording and reproducing the information. The navigation device according to the present invention is characterized in that the input means records destination information on an information recording layer on which the information can be recorded and reproduced. Further, in the navigation device according to the present invention, the destination information is information on a route to the destination.

Embodiments of the present invention will be described below with reference to the drawings. First, an optical recording medium according to the present invention will be described with reference to FIGS. Referring to FIG. 1, an optical recording medium 1 according to the present invention has a laser light incident surface 1.
A first information recording layer 11 is formed at a first distance from 0, and a second information recording layer 12 and a third information recording layer 13 are formed at a second distance. In the present invention, the first distance is set in a range of 0.1 to 0.5 mm, and the second distance is set to 0.1.
The third distance is set to 1.1 within a range of 55 to 0.65 mm.
Set to a range of ~ 1.3 mm. The first and second information recording layers are read-only information recording layers.
Is an information recording layer capable of recording and / or reproducing signals. Next, with reference to FIG. 2 showing an enlarged part of the optical recording medium 1 shown in FIG.
Reference numeral 1 denotes a signal recording surface 11a formed of a pit row in a high-density DVD format, which is a next-generation DVD, and a first reflective layer 11b formed so as to cover the signal recording surface 11a, and a second information recording layer. Numeral 12 includes a signal recording surface 12a formed of a pit row in the DVD format and a second reflective layer 12b formed so as to cover the signal recording surface 12a, and a third information recording layer 13 includes a magnetic layer 13a. . FIG. 3 shows standard values and reproduction conditions of the high-density DVD and the DVD. DVD substrate thickness is 0.6 (tolerance ± 0.05)
mm, the shortest pit length is 0.40 (allowable error ± 0.1) μ
m, track pitch 0.74 (tolerance ± 0.01) μ
m, the reflectivity for a laser beam having a wavelength of 635 nm is 7
0% or more, the spot diameter of the laser beam during reproduction is 0.9 (tolerance ± 0.05) μm, the numerical aperture of the objective lens is 0.6 (tolerance ± 0.05), and the reproduction laser beam wavelength Is 635 (allowable error ± 15) nm. The substrate thickness of the high-density DVD is 0.3 (tolerance ± 0.2) mm, the shortest domain length is 0.25 (tolerance ± 0.05) μm,
Track pitch is 0.35 (allowable error ± 0.05) μ
m, the reflectivity for a laser beam having a wavelength of 430 nm is 2
0 to 80%, the spot diameter of the laser beam during reproduction is 0.55 (tolerance ± 0.05) μm, the numerical aperture of the objective lens is 0.65 (tolerance ± 0.05), and the reproduction laser beam The wavelength is 430 (allowable error ± 15) nm. Therefore, the pits forming the first signal recording surface 11a recorded in the high-density DVD format are smaller than the pits forming the second signal recording surface 12a recorded in the DVD format, and have a narrower track pitch. When recording or reproducing a signal on or from the optical recording medium 1, a laser beam L 1 having a wavelength λ 1 is applied to the signal recording surface 12 a of the second information recording layer 12 on the signal recording surface 11 a of the first information recording layer 11.
The laser beam L2 of the wavelength λ2, the third information recording layer 13
Is irradiated with a laser beam L3 having a wavelength λ3. The wavelength λ1 is 400 to 480 nm, the wavelength λ2 is 620 to 650 nm, and the wavelength λ3 is 765 to 795 nm. Therefore, as a material used for the first reflection layer 11b,
The laser beam having a wavelength of 400 to 480 nm is reflected, and the laser beam having a wavelength of 620 to 650 nm is reflected.
A material that transmits laser light in the range of 795 nm is suitable, and as a material used for the second reflective layer 12b,
A material that reflects laser light in a wavelength range of 620 to 650 nm and transmits laser light in a wavelength range of 765 to 795 nm is suitable. In the present invention, for example, a cyanine dye or silicon carbide (SiC) is used for the first reflective layer 11b, and silicon (Si) is used for the second reflective layer 12b. Further, a GdFeCo / TbFeCo-based magnetic film is used for the magnetic layer 13a of the third information recording layer 13. The information recorded on the first signal recording surface 11a is reproduced by a laser beam having a wavelength of 400 to 480 nm by forming the first reflective layer 11b with a cyanine dye or silicon carbide and forming the second reflective layer with silicon. Thus, information recorded on the second signal recording surface 12a can be reproduced by a laser beam having a wavelength of 620 to 650 nm, and information can be recorded on the third information recording layer 13 by a laser beam having a wavelength of 765 to 795 nm. Therefore, the optical recording medium 1 is a high-density DVD player that emits laser light having a wavelength of 400 to 480 nm, and a wavelength of 620 to 650 nm.
The signal can be reproduced or recorded by a DVD player that emits a laser beam having a wavelength of 765 to 795 nm and a CD player that emits a laser beam having a wavelength of 765 to 795 nm. Also,
In the above, the third information recording layer 1 capable of recording a signal
Although the information recording layer using a magnetic film has been described as 3, the present invention is not limited to this, and the third information recording layer 13 may be formed using a material used for a phase-change optical disk. The third information recording layer 13 may be formed by a CD-R as described above. Next, a case where the optical recording medium 1 is used in a car navigation system will be described. FIG. 4 shows an optical recording medium 1 on which map information and the like are recorded.
1 shows a flowchart of a car navigation system using the above. Starting at step S1,
In step S2, a laser beam having a wavelength of 780 nm is irradiated on the optical recording medium 1, and in step S3, a destination path is recorded on the third information recording layer 13 of the optical recording medium 1. The operations from step S1 to step S3 are normally performed at home. When the optical recording medium 1 is mounted on the car navigation system in step S4, it is determined in step S5 whether the player on which the optical recording medium 1 is mounted is a high-density DVD player. If it is determined that the disc is a high-density DVD player, a laser beam having a wavelength of 430 nm or a wavelength of
m is irradiated on the optical recording medium 1, and Step S 7 is performed.
Then, a map is sequentially displayed from the first information recording layer 11 or the second information recording layer along the route of the destination. In this embodiment, the first information recording layer 11 and the second information recording layer 1
2, the same map information is recorded. On the other hand, in step S5, the player on which the optical recording medium
If it is determined that the player is the player, the wavelength 63 is determined in step S8.
The optical recording medium 1 is irradiated with a laser beam of 5 nm, and in step S9, maps along the route from the second information recording layer 12 to the destination are sequentially displayed. When the vehicle arrives at the destination in step S10, it is determined in step S11 whether or not the destination has been changed. If the destination is to be changed, a laser beam having a wavelength of 780 nm is irradiated on the optical recording medium 1 in step S12. Then, the destination route changed in step 13 is recorded in the third information recording layer 13. When a new destination route is recorded, the process returns to step S5, and the operations from step S6 to step 10 are repeated. If there is no change in the destination in step S10, the process ends in step S14. The operations in steps S12 and S13 can be performed from a car navigation device. An apparatus for recording a destination route on an optical recording medium 1 at home will be described with reference to FIG. The destination information is input from the input means 70.
The input destination information is sent to the system controller 71, which controls the high-density DVD player (or DVD player) 72 based on the destination information sent from the input means 70, and outputs the destination information. Record The car navigation device will be described with reference to FIG. High-density DVD player (or DV
When the optical recording medium 1 is mounted on the D player 81, “start” is input from the input unit 83, and the system controller 82 inputs “start” from the input unit 83.
The high-density DVD player (or DVD player) 81 is controlled based on the signal. The high-density DVD player (or DVD player) 81 reproduces the destination information from the third information recording layer 13 of the optical recording medium 1 mounted under the control of the system controller 82, and outputs a laser beam of 430 nm wavelength or By irradiating the optical recording medium 1 with a laser beam having a wavelength of 635 nm, a map suitable for the destination information is selected from the first information recording layer 11 or the second information recording layer 12, and displayed on the display unit 80. After you arrive at your destination,
If the destination is changed, the changed destination information is input from the input means 83. When the changed destination information is input from the input means 83, the system controller 82 outputs a high-density DVD player (or DVD) based on the input information.
The player 81 is controlled to record the changed destination information in the third information recording layer 13 of the optical recording medium 1. As described above, by using the optical recording medium 1 according to the present invention, even a car navigation device equipped with a high-density DVD player has a lower quality DV than a high-density DVD player.
Even a car navigation device equipped with a D player can use a car navigation system. Further, the optical recording medium 1 according to the present invention can record destination information, and thus has a function as a voice recorder.

According to the present invention, according to the present invention, when an optical recording medium is used for recording information for car navigation, information on a destination route can be recorded on the optical recording medium. It can be used as a recorder.

[Brief description of the drawings]

FIG. 1 is a sectional view of an optical recording medium according to the present invention.

FIG. 2 is an enlarged view of a part of the optical recording medium shown in FIG.

FIG. 3 is a table showing standard values and reproduction conditions of a high-density DVD and a DVD.

FIG. 4 is a flowchart when the optical recording medium according to the present invention is used as a recording medium for car navigation.

FIG. 5 is a block diagram of an apparatus for recording destination information on an optical recording medium.

FIG. 6 is a block diagram of a car navigation device using an optical recording medium.

[Explanation of symbols]

 Reference Signs List 1 optical recording medium 10 laser light incident surface 11 first information recording layer 11a first signal recording surface 11b first reflection layer 12 second information recording layer 12a second signal recording surface 12b second reflection layer 13 Third information recording layer 13a Magnetic layer 80 Display unit 72, 81 Player 71, 82 System controller 70 Input means

Claims (3)

[Claims] An information recording layer provided at a first distance from a substrate surface on which a laser beam is incident and at least map information is recorded, and provided at a second distance from a substrate surface on which a laser beam is incident. An information recording medium having an information recording layer capable of recording and reproducing information; a means for recording and reproducing information on the recording medium; and inputting information to be recorded on the information recording layer capable of recording and reproducing information. A navigation device comprising: 2. The navigation device according to claim 1, wherein said input means records destination information on an information recording layer on which said information can be recorded and reproduced. 3. The navigation device according to claim 2, wherein the destination information is information on a route to the destination.