JPH0242680A - Disk detector - Google Patents

Abstract

PURPOSE:To prevent the detection from taking a considerable time by detecting the heightwise position of a substrate when irradiating light from a light emitting element is received by a light receiving element. CONSTITUTION:The irradiating light from the light emitting element 5 passes through an aperture part 4 provided on a tray 2 to irradiate disks 10a-10d housed in their respective housing parts 3a-3d, and reflected irradiating light from the light emitting element 5 by the respective disks 10a-10d is received via the aperture part 4 by a light receiving element 6. Now, a light irradiating angle of the light emitting element 5 and a light receiving angle of the light receiving element 6 are set as a fixed angle, and since a reflecting point of the irradiating light for receiving the irradiating light from the light emitting element 5 by the light receiving element 6 is always constant, the substrate 7 is set up to be movable up and down between the uppermost position A and the lowermost position D. By this method, the disk can be started to play simultaneously with completion of loading the tray.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) 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, CD (Be
s, 12cm) and LD (20cm, 30 am
) etc.) can be stored concentrically, and the height of storage varies 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 use a pink amplifier or sensor to detect the presence or absence of a disc and its type.

(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 Problems) 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 a tray, and the storage height is different for each type of disk. In a loading type disc playback device configured to be different from the above, an opening is formed in the disc storage portion of the tray, and a pair of light emitting element and light receiving element are arranged near the tray, and the light emitting element and the light receiving element are arranged in the vicinity of the tray. The element and the light-receiving element are integrally provided so as to be movable up and down, and light from the light-emitting element passes through the opening and is reflected by the disk stored in the disk storage section, and the reflected light passes through the opening. The light is received by the light receiving element through the light receiving element.

(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. That is, an opening is formed in the disk storage portion of the tray, and a pair of light emitting elements and light receiving elements are arranged facing each other at arbitrary positions within a range in which the opening moves as the tray is loaded.

The light-emitting element and the light-receiving element are arranged on the same substrate, and are moved up and down integrally by moving the substrate up and down. That is, the board is moved up and down as the tray containing the disc is loaded into the player body. Then, by detecting the position in the height direction of the board when the light emitted from the light emitting element is received by the light receiving element, it is possible to know in which disc storage part the disc is stored. It is possible to detect the type and presence of discs stored in the tray.

(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 loaded, 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 (8cmCD/12cmCD/20cmL
This example shows a composite player capable of playing D/30cmLD.

In the figure, symbol 2 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 cm, 2
There are four types of disc storage parts 3a and 3b in disc shape: 0 cm, L 2 cm, and 8 cm.

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. Further, the tray 2 is formed with an elongated opening 4 extending from the center of the disk storage portion 3d having the smallest diameter to near the rear end.

On the other hand, at a lower position of the tray 2 in the player main body 1,
One light emitting element 5 and one light receiving element 6 are on the same substrate 7
It is placed in a fixed position at the top. The light emitting element 5 is
As shown in FIGS. 4 and 5, the light receiving element 6 is arranged so as to irradiate light diagonally upward to the left, and the light receiving element 6 is arranged so as to receive light coming from diagonally upward to the right. Although not shown, the substrate 7 on which the light-emitting element 5 and the light-receiving element 6 are mounted is movable up and down by a drive mechanism.

That is, the irradiated light from the light emitting element 5 passes through the opening 4 provided in the tray 2 and enters each disk storage section 3a, 3b.
, 3c, 3d, the disks 10a, 10b, 1
It is designed to be irradiated at 0c and 10d. Further, the light receiving element 6 transmits the irradiated light from the light emitting element 5 reflected by the disks 10a, 10b, 10c, and 10d stored in the respective disk storage sections 3a, 3b, 3c, and 3d to the opening 4.
It is designed to receive light through the

Here, the irradiation angle of the light emitting element 5 and the light receiving angle of the light receiving element 6 are set to a constant angle, and the reflection point of the irradiated light for receiving the irradiated light from the light emitting element 5 by the light receiving element 6 is always constant. It becomes.

Therefore, the disk 1 stored in the disk storage section 3a
In order to detect 0a, it is necessary to position the substrate 7 (that is, the positions of the light emitting element 5 and the light receiving element 6) at the height indicated by symbol A in FIG. In order to detect the disc 10c stored in the disk storage section 3C, it is necessary to position the board 7 at the height indicated by the symbol B in the figure. The disk 10 stored in the disk storage section 3d must be positioned at a height of
In order to detect d, it is necessary to position the substrate 7 at the height indicated by the symbol in the figure. Therefore, the board 7 is placed at the uppermost position A.
Set it to move up and down between and the lowest position.

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 placed in a disc storage section corresponding to its shape. After this, transfer tray 2 to player body 1.
During the loading process, the substrate 7 is lowered from the uppermost position A to the lowermost position at a constant speed while causing the light emitting elements 5 to emit light continuously. At this time, if the disk 10a is stored in the disk storage portion 3a with the largest diameter, the board 7 will remain in the A position and detect the disk 10a, and the disk 10a will be stored in the disk storage portion 3b.
0b is stored, the board 7 descends to the B position and has full knowledge of the disc 10b, and when the disc 10c is stored in the disc storage part 3C, the board 7 is moved to the C position. If the disk 10d is stored in the smallest diameter disk storage portion 3d, the substrate 7 will be lowered to the D position and detect the disk 10d.

Therefore, by detecting the position of the substrate 7 in the height direction when the disc is detected (that is, when the light emitted from the light emitting element 5 is received by the light receiving element 6), the type and presence or absence of the disc can be determined. Can be done.

Further, such a lowering operation of the substrate 7 is performed during the loading process of the tray 2, and the disc detection is performed before the loading of the tray 2 is completed, so that the type of disc can be determined while the tray 2 is being loaded. Therefore, the player itself can be set to a playback standby state so that the playback operation can be performed at the same time that the tray 2 is completely loaded into the player body 1. 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, it is possible to start playing the disc at the same time as the loading of the tray is completed. 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. 4 is a schematic diagram showing the arrangement relationship between the light emitting element and the light receiving element, and FIG. 5 is a diagram showing the relationship between each disk and the detection position by the light emitting element and the light receiving element. 1... Player main body 2... Trays 3a to 3d... Disc storage section 4... Opening 5... Light emitting element 6... Light receiving element 0a to 10d... Disc

Claims (1)

[Claims] 1) In a loading-type disc playback device in which a plurality of discs with different diameters can be stored concentrically on a tray, and the storage height is set to be different for each type of disc. , an opening is formed in the disk storage portion of the tray, and a pair of light emitting element and light receiving element are arranged near the tray, and the light emitting element and the light receiving element are provided so as to be integrally movable up and down. The light from the light emitting element passes through the opening and is reflected by a disc stored in the disc housing, and the reflected light passes through the opening and is received by the light receiving element. A disc detection device characterized by: