JPH03135700A - Vehicle position calculation device - Google Patents

Abstract

PURPOSE:To prevent the wear and the deterioration of a medium drive device, and to calculate a vehicle position continuously for a long time by driving a medium by the medium drive device only when the medium drive device reads map information. CONSTITUTION:At the time of reading the digital map information from a CD-ROM medium 11, a position calculation device 14 outputs a CD-ROM start signal to a drive control part 15, and the drive control part 15 starts the revolving mechanism 12a and the pickup mechanism 12b of a CD-ROM drive device 12. When the read of the digital map information is completed, the position calculation device 14 stops outputting the CD-ROM start signal, and the drive control part 15 stops the revolving mechanism 12a and the pickup mechanism 21b of the CD-ROM drive device 12. Thus, by driving the medium 11 only when the medium drive device 12 reads the map information, the wear and the deterioration of the medium drive device is eliminated, and the vehicle position can be calculated continuously for a long time.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a vehicle position calculation device used in a vehicle navigation system or the like.

2. Description of the Related Art Conventionally, this type of vehicle position calculation device uses a CD-ROM in which digital map information is stored in advance, as shown in FIG.
(Compact Disc - Read Only Memory) Media 1
A CD-ROM that drives the computer and reads digital map information.
A drive device 2, a RAM (random access memory) 3 for storing digital map information read by the CD-R, 0M drive device 2, and an RA.
The vehicle is equipped with a position calculation device 4 that calculates the position of the vehicle based on the digital map information stored in M3.

The position calculation device 4 includes a rotation mechanism 2a of the CD-ROM drive device 2, so that the CD-ROM medium 1 can always read digital map information from the time the power is turned on.
By controlling the pickup mechanism 2b, digital map information newly required as the vehicle moves is read out, and the digital map information stored in the RAM 3 is updated, thereby continuously calculating the vehicle position.

Problems to be Solved by the Invention However, in the above conventional vehicle position calculation device, the CD
- Since the rotation mechanism 2a1 and pickup mechanism 2b of the ROM drive device 2 are always in operation, the rotation mechanism 2a wears out and the pickup mechanism 2b deteriorates, making it impossible to continuously calculate the vehicle position for a long time. There is a point.

The present invention solves the above conventional problems, and aims to provide a vehicle position calculation device that can continuously calculate a vehicle position for a long time.Means for Solving the ProblemsThe present invention In order to achieve the above object, the medium driving device drives the medium only when the medium driving device reads map information.

Effects According to the present invention, with the above configuration, the medium drive device is not always in a driving state, so the medium drive device is not worn out or deteriorated, and therefore, the vehicle position can be continuously calculated for a long time.

EXAMPLES Hereinafter, the present invention will be described in detail with reference to the drawings. FIG. 1 is a block diagram showing an embodiment of a vehicle position calculation device according to the present invention.

In FIG. 1, 11 is a CD-ROM (compact disk-read only memory) medium in which digital map information is stored in advance, and 12 is a CD-ROM that drives the CD-ROM medium 1 and reads the digital map information.
It is a drive device. The CD-ROM drive device 12 includes a rotation mechanism 12a that rotates the CD-ROM medium 11.
It has a pickup mechanism 12b that irradiates the CD-ROM medium 11 with a laser beam and reads digital map information using the reflected light, and the head of the pickup mechanism 12b moves in the radial direction of the CD-ROM medium 11.

13 is a RAM for storing digital map information read by the CD-ROM drive device 12;
(Random access memory), 14a is a position calculation device that calculates the position of the vehicle based on the digital map information stored in the RAM 13, and 15 is a CD-ROM drive device that calculates the position of the vehicle based on the CD-ROM activation signal from the position calculation device 14a. 12 rotation mechanisms 12a and pickup mechanisms 12b
This is a drive control unit that controls the

Next, the operation of the above embodiment will be explained.

In FIG. 1, the position calculation device 14 is a CD-ROM
When reading digital map information from medium 11, CD
- A ROM activation signal is output to the drive control unit 15, and the drive control unit 15 activates the rotation mechanism 12a and pickup mechanism 12b of the CD-ROM drive device 12.

When the rotation mechanism 12a and the pickup mechanism 12b are activated and the CD-ROM drive device 12 is put into operation, the position calculation device 14 outputs a control signal such as an address for reading digital map information to the CD-ROM drive device 12. CD-ROM drive device 1
2 drives the CD-ROM medium 1 according to this control signal to read digital map information and stores it in RAMI:3.

When the reading of the digital map information is completed, the position calculation device 14 stops outputting the CD-ROM activation signal, and the drive control section 15 controls the CD-ROM drive device 1.
The operation of the rotation mechanism 12a and the pickup mechanism 12b of No. 2 is stopped.

The position calculation device 14 calculates the position of the vehicle based on the digital map information stored in the RAM 1 3, and repeats the above process when new digital map information is required as the vehicle moves.

Therefore, according to the above embodiment, the CD-ROM medium 1
Only when reading digital map information from 1, CD-
Since the rotation mechanism 12a and the pickup mechanism 12b of the ROM drive device 12 are in operation, the rotation mechanism 2a is not worn out and the pickup mechanism 2b is not deteriorated. Therefore, the vehicle position can be calculated continuously for a long time. Can be done.

DETAILED DESCRIPTION OF THE INVENTION As described above, the present invention allows the media drive device to drive the medium only when the media drive device reads map information, so that the media drive device does not wear out or deteriorate. , Therefore, the vehicle position can be continuously calculated for a long time.

4

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing an embodiment of a vehicle position calculation device according to the present invention, and FIG. 2 is a block diagram showing a conventional vehicle position calculation device. 11...CD-ROM medium, 12...CD-
ROM drive device, 12a... rotation mechanism, 12b...
...Pickup mechanism, 13...RAM (random access memory), 14...Position calculation device, 15...
・Drive device.

Claims (2)

[Claims] (1) A medium driving device that reads map information by driving a medium in which map information is stored, means for storing map information read by the medium driving device, and a map stored in the storage means. A vehicle position calculation device comprising: means for calculating the position of a vehicle based on information; and means for controlling the medium drive device to drive a medium only when the medium drive device reads map information. (2) Claim (1), wherein the medium drive device reads map information stored in a CD-ROM medium.
The vehicle position calculation device described.