JPH0242679A - Disk detector - Google Patents

Abstract

PURPOSE:To prevent the detection from taking a considerable time by providing one light receiving element to be capable of moving back and forth on a line connecting optical paths of individual reflecting rays. CONSTITUTION:An irradiating light from the light emitting element 5 is set so as to pass in turn through individual aperture parts 4a-4d provided on individual disk housing parts 3a-3d by moving a tray 2 back and forth in the direction of an arrow mark P. Then, when the individual disk housing parts 3a-3d are housed with their respective disks 10a-10d, the reflected rays from the individual disks 10a-10d are received in their moving positions A-D by a light receiving element 6. Thus, since the kind and presence, etc., of a disk can be discriminated prior to completion of loading the tray, the disk can be started to play simultaneously with the completion of loading the tray.

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Application Field) The present invention relates to a disc detection device, and particularly to a disc detection device that detects a plurality of discs with different diameters [for example, a CD (8C)] on one tray.
Im, 12cm) and LD (20CI11, 30C1
It is used in a loading type disc playback device in which discs such as 1) can be stored concentrically and the storage height differs depending on the type of disc.

(Prior Art) Various detection methods have been proposed to detect the type of disc stored on a tray in a loading-type disc playback device that can play multiple types of discs with different diameters. Among these methods, the most common method is to detect the presence or absence of a disc and its type using a pick amplifier or a sensor.

(Problem to be Solved by the Invention) However, in the conventional detection method described above, for example, when detecting with a pickup or sensor, detection is started when the tray is completely loaded into the device body. There was a problem with how long it took.

(Means for Solving the Problem) The present invention has been made in view of the above-mentioned circumstances, and is capable of storing a plurality of disks with different diameters concentrically on one tray, and the height of the storage is the same as that of the disk. In a loading type disc playback device that is set differently for each type, one light emitting element is provided at a position where it can illuminate all the discs stored in the tray, and the light from this light emitting element is The light is irradiated onto the disks housed in the tray and is reflected along different paths for each disk with a different diameter, and a light receiving element is provided in the optical path of these reflected lights, and the light receiving element detects each of the reflected lights. It is provided so that it can move back and forth on a line connecting the optical paths of the two.

(Function) The present invention utilizes the shift of the reflection point due to the difference in the height of the storage position of disks with different diameters on the tray. In other words, if one light emitting element is provided at a position where it can illuminate all the discs stored in the tray, and the light from this light emitting element is irradiated onto each disc stored in the tray, the height of the storage position of each disc will increase. Since the reflection point of the irradiated light differs depending on the difference, the light reflected from each disk follows a different path and is reflected for each disk. Therefore, by providing one light-receiving element that can move back and forth on the line connecting the optical paths of each reflected light, it is possible to detect the type and presence or absence of the disc stored in the tray from the light-receiving position of this one light-receiving element. can do.

(Example) Hereinafter, one embodiment of the present invention will be described with reference to the drawings.

Fig. 1 is a sectional view of the disk detection device of the present invention seen from the plane, Fig. 2 is a vertical sectional view of the device with the tray stored, and Fig. 3 is a plan view of the device with the tray pulled out. The cross-sectional views, FIGS. 4 and 5, are schematic diagrams showing the arrangement relationship between the light emitting element and the light receiving element. In this example, four types of discs (8CIIICD/12CIICD/20CIICD) are used.
This example shows a composite player capable of reproducing an image (c+aLD/30cmLD).

In the figure, 1 is a player body, and 2 is a tray that can be pulled out from the front opening 1a of the player body 1 and loaded into the player body 1. That is, the tray 2 is provided so as to be able to reciprocate in the direction of arrow P in the figure. This tray 2 has four types of disc storage parts 3a and 3b, each having a diameter of 30 marks, 20 holes, 1201!1, and 80 discs.

3c and 3d are formed concentrically, and are formed in a step-like manner such that the disk storage section 3a with the largest diameter is at the top and the disk storage section 3d with the smallest diameter is at the bottom.

That is, the storage height of the disk on the tray 2 differs depending on the diameter of the disk. Furthermore, openings 4a, 4b, 4c, and 4d each having a constant diameter are provided in each of the disk storage sections 3a, 3b, 3c, and 3d. These openings 4a, 4b, 4c, 4d are
Due to the positional relationship with the light emitting element 5, which will be described later, the tray 2 is provided at a position slightly shifted in a direction Q perpendicular to the reciprocating direction P of the tray 2.

On the other hand, at a lower position of the tray 2 in the player main body l,
One light emitting element 5 and one light receiving element 6 are arranged to face each other along a direction Q orthogonal to the reciprocating direction P of the tray 2. As shown in FIGS. 4 and 5, the light emitting element 5 is arranged to emit light diagonally upward to the left, and the light receiving element 6 is arranged to receive light coming from diagonally upward to the right. There is. Further, the light receiving element 6 is provided so as to be able to reciprocate along a direction Q orthogonal to the reciprocating direction P of the tray 2 .

That is, by reciprocating the tray 2 in the direction of the arrow P, the irradiated light from the light emitting element 5 is transmitted to each opening 4a, 4 formed in each disk storage section 3a, 3b, 3c, 3d.
b, 4c, and 4d are set to pass sequentially.

Further, when the light from the light emitting element 5 passes through the opening 4a of the disc storage section 3a, the light receiving element 6 moves to the middle position in FIG. Move to position B in the figure, and then
When passing through the opening 4C of the disk storage section 3d, it moves to the position C in the figure, and when passing through the opening 4d of the disk storage section 3d, it moves to the middle position in the figure. Therefore, each disk storage section 3a.

3b, 3c, and 3d have disks 10a and IQb, respectively.

10c and 10d are stored, the light receiving element 6
receives the reflected light from each of the disks loa, 10b, 10c, and 10d at each of the above-mentioned movement positions A, B, C, and D.

Next, the operation of the disk detection device having the above configuration will be explained.

First, as shown in Figure 3, place the tray 2 into the player body 1.
The disc is pulled out from the front opening 1a to set it in an oven state, and in this state, any disc is stored in a disc storage section corresponding to its shape. Then, when the tray 2 is loaded into the player main body 1, during the loading process, the irradiation light from the light emitting element 5 illuminates the openings provided in each disc storage section 4a.
-+ 4 b - e 4 (-+ 4 d) If a disc is stored, the light is reflected at the opening of the disc storage section where the disc is stored. This reflected light is As described above, the light is received by the light receiving element 6 which moves in conjunction with the movement of the tray 2, and the type of disc and the presence or absence of the disc can be determined based on the light receiving position f(A-D) of the light receiving element 6.

Figure 5 shows a specific example of disk detection.
An example in which a disk IQa of country 0 is stored in the disk storage section 3a is shown by a solid line.

That is, when the tray 2 storing the disk 10a passes over the light emitting element 5, the irradiated light from the light emitting element 5 passes through the opening 4a provided in the disk storage part 3a and hits the disk 10a, and the reflected light is reflected from the light emitting element 5. The light is received by the light receiving element 6 which moves in conjunction with the movement of the tray 2. In this case, since the light receiving element 6 receives the reflected light at the position A in FIG. 5, the light receiving element 6 receives 30 CI!
It can be detected that the + disc is stored in the disc storage section 3a. In this way, the type of disc can be determined before tray 2 is completely loaded, so the player itself can be put into playback standby so that it can start playing at the same time that tray 2 is completely loaded into the player body l. can be set to the state. In addition, if two or more types of discs are accidentally stored in the disc storage unit, etc., and the storage state is such that playback cannot be performed, the light-receiving element will 6 receives the reflected light, it can be determined from this that it is in a non-reproducible state, and in this case, processing such as setting the operation mode to eject the disc can be quickly performed. Furthermore, it is also possible to output a signal for displaying a display corresponding to the type of disc stored.

(Effects of the Invention) As explained above, according to the disc detection device of the present invention, the type and presence or absence of the disc can be determined before the loading of the tray is completed. can be started. Furthermore, since all disks can be detected with a pair of light emitting element and light receiving element, it is possible to reduce the number of parts and manufacturing costs.

[Brief explanation of the drawing]

Fig. 1 is a sectional view of the disk detection device of the present invention seen from the plane, Fig. 2 is a vertical sectional view of the device with the tray stored, and Fig. 3 is a plan view of the device with the tray pulled out. The cross-sectional views, FIGS. 4 and 5, are schematic diagrams showing the arrangement relationship between the light emitting element and the light receiving element. 1... Player main body 2... Trays 3a-3d... Disk storage portions 4a-4d... Opening 5... Light emitting element 6... Light receiving elements 10a-10b... Disc

Claims (1)

[Scope of Claims] 1) A loading type disk in which a plurality of disks with different diameters can be stored concentrically on one tray, and the storage height is set to differ depending on the type of disk. In the playback device, one light emitting element is provided at a position where it can illuminate all the discs housed in the tray, and the light from this light emitting element is irradiated to the discs housed in the tray, and the light emitting element is irradiated to all the discs housed in the tray, and the light emitting element is irradiated to all the discs housed in the tray. Each disc is reflected along a different path, and a light receiving element is provided in the optical path of these reflected lights, and the light receiving element is provided so as to be able to reciprocate on a line connecting the optical paths of each of the reflected lights. A disc detection device featuring: