JPH0242678A - Disk detector - Google Patents

Abstract

PURPOSE:To prevent taking a time for a detection by utilizing the dislocation of a reflecting point due to a difference in housing position heights on the tray of respective disks different in diameters. CONSTITUTION:One light-emitting element 5 is provided in a position irradiatable to all of respective kinds of disks housed in a tray 2, and when a light from the light-emitting element 5 irradiates respective disks housed in the tray 2, the reflecting points of the irradiating lights are made different due to the difference in the heights of housing positions 31a-31d of respective disks, and thereby, the lights reflected at respective disks are reflected through routes different for respective disks, respectively. By providing light-receiving elements 6a-6d in the optical paths of respective reflected lights, respectively, the kind of the disks housed to the tray, etc., can be detected by deciding with which of light-receiving elements the light is received. Thus, since the kind and existence, etc., of the disks can be discriminated before the loading comple tion of the tray, the performance of the disk can be started at the same time as the loading completion of 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 on one tray [for example, a CD (8c).
It is used in a loading type disc playback device in which discs such as LD (20am, 30a1) and discs such as LD (20am, 30a1) 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, the most common method is to detect the presence or absence of a disc and its type using a pickup or 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 having a different diameter, and a light receiving element is provided on each optical path of the reflected light.

(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, one light emitting element is provided at a position where it can illuminate all of the discs of each type stored in the tray, and when the light from this light emitting element is irradiated onto each disc stored in the tray, each disc is stored. Since the reflection point of the irradiated light differs depending on the difference in position height, the light reflected from each disk follows a different path and is reflected for each disk. Therefore, by providing a light receiving element in each optical path of each reflected light, it is possible to detect the type of disk stored in the tray based on which light receiving element receives the light.

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

Fig. 1 is a cross-sectional view of the disk detection device of the present invention seen from above, Fig. 2 is a longitudinal cross-sectional view of the device with the tray stored, and Fig. 3 is a longitudinal cross-section of the device with the tray pulled out. 4 and 5 are schematic diagrams showing the arrangement relationship between a light emitting element and a light receiving element.

In this example, four types of discs (8cm CD/
12C11CD/20cmLD/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 a diameter of 30 (J, 2
Four types of disk storage sections 3a and 3b are available, each having a disk shape of 0cm, 12C11, and 8C111.

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 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.

The openings 4a, 4b, 4c, and 4d are provided at positions slightly shifted in a direction Q perpendicular to the reciprocating direction P of the tray 2, depending on the positional relationship with a light emitting element 5, which will be described later.

On the other hand, at a lower position of the tray 2 in the player main body 1,
One light emitting element 5 and four light receiving elements 6 a + 6 b, 6
c and 6d are arranged in a line along the 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 so as to emit light diagonally upward to the left, and the light receiving elements 6a, 6b, 6c
, 6d are arranged to receive light coming from diagonally above and to the right.

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, the light receiving element 6a is set to receive light that passes through the opening 4a and is reflected by the disc 10a when the disc 10a is stored in the disc storage section 3a, and the light receiving element 6b is When the disc 10b is stored in the disc storage part 3b, the light receiving element 6C is set to receive the light that passes through the opening 4b and is reflected by the disc 10b. When the disc 10c is stored, the light receiving element 6d is set to receive the light that passes through the opening 4C and reflected by the disc 10C, and the light receiving element 6d is configured to receive the light that passes through the opening 4C and is reflected by the disc 10C. In this case, it is set to receive the light that passes through the opening 4d and is reflected by the disk 10d.

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 open the disc, and in this state, any disc is inserted into the disc storage section corresponding to its shape. Then, place tray 2 into player body 1.
During the loading process, the irradiation light from the light emitting element 5 illuminates the opening formed in each disk storage section 4a.
−4b −= 4(−+ 4 d passed in order,
When a disk is stored, light is reflected by the disk, and this reflected light is received by a corresponding light receiving element. This makes it possible to determine the presence or absence of a disc and its type.

Figure 5 shows a specific example of disk detection.
An example is shown in which a 0 cm disc 10a is stored in the disc storage section 3a.

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 corresponding light receiving element 6a. With this, it is possible to detect that a 30cm disc has been set, so it is possible to detect that a 30cm disc has been set.
The player itself can be set to a playback standby state so that the playback operation can be performed as soon as the player is completely housed in the player main body 1. In addition, if two or more types of discs are accidentally stored in a storage state that cannot be played, each reflected light will be received by the light receiving element corresponding to each disc stored, resulting in a state where playback is impossible. 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.

[Brief explanation of the drawing]

Fig. 1 is a cross-sectional view of the disk detection device of the present invention seen from above, Fig. 2 is a longitudinal cross-sectional view of the device with the tray stored, and Fig. 3 is a longitudinal cross-section of the device with the tray pulled out. 4 and 5 are schematic diagrams showing the arrangement relationship between a light emitting element and a light receiving element. 6a to 6d... Light receiving elements 10a to 10b... Disk

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 stored in the tray, and the light from this light emitting element is irradiated onto the discs stored in the tray, and the discs having different diameters are 1. A disc detection device characterized in that light is reflected along different paths for each disc, and a light receiving element is provided on each optical path of the reflected light.