JPS6358660A - Method for detecting disk size of disk player - Google Patents

Abstract

PURPOSE:To surely know the diameter of a disk by detecting that the disk is put into a player main body by a tilt sensor and then deciding the size of the disk from the relative shift value detected between the disk and a pickup or the tilt sensor. CONSTITUTION:The light is emitted from a tilt sensor 12 attached to a pickup 9 for reading the disk information when a disk 3 is put on a loading tray and set into a player main body 1. A microcomputer 11 detects the first point of time when the light emitted from the sensor 12 hits the disk 3 based on the detecting signal of the sensor 12. Furthermore the sensor 12 detects continuously the disk 3 for a prescribed period of time during which the disk 3 is put into the main body 1. In this case, the detected signal by the sensor 12 is continuously sent to the computer 11. Then the computer 11 decides the diameter of the disk 3 from the detected shift value.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention is applicable to a video disc (VD) player, a video disc/compact disc combination (VD/CD combination)
This invention relates to a method for detecting disc size in a player.

[Prior Art] For example, optical VD players that can use video discs of different sizes (for example, 3Qcm discs and 2Qcm discs) are already known.

Such a VD player is provided with a means for determining the size and diameter of a disc in the player body in order to reproduce video. Figures 7 to 9 are examples of VD
This figure shows a schematic configuration of the player. To explain this, a loading tray 2 is provided at one side opening of the player main body 1, and when a disc 3 is placed on the loading tray 2 and the loading motor 4 is turned on, the disc 3 is moved along with the loading tray 2. It is carried into the player main body 1. When the tray detection sensor 5 detects that the loading tray 2 has been inserted all the way into the player body 1, the disc 3 is moved between the hub 6 and the presser plate 7, which are arranged oppositely in the center of the player body 1. It is sandwiched between. Thereafter, the disk 3 is rotated by the spindle motor 8, and the information writing surface of the disk is read by the optical pickup 9, thereby performing video reproduction. Thus, the player body 1
As shown in FIG. 8, disk detection sensors 10, 10 are provided within the disk drive as a means for determining the size and diameter of the disk, the number of which corresponds to the size and diameter of the disk. Based on the detection signals from these disc detection sensors 10, 10, a microcomputer 11 built into the player body 1 is operated to determine the presence or absence of a disc and the size and diameter of the disc.

[Problems to be Solved by the Invention] However, as described above, providing disk detection sensors for each size and diameter of usable disks has the disadvantage of increasing the number of parts, requiring time and effort to manufacture, and increasing product cost. Ta. In addition, the structure became complicated, which hindered miniaturization of the product.

[Object of the Invention] The present invention has been made in view of the above-mentioned problems, and its purpose is to reduce the manufacturing cost and make the disc player more compact in that it can use discs of different sizes and diameters. There is a particular thing.

[Means for Solving the Problems] To achieve this object, the present invention provides a disc player in which discs of different sizes and diameters can be used. After that, the disc is detected by a pickup disposed inside the player body for reading disc information, or a tilt sensor attached to the pickup for detecting disc warp, and the disc and the pickup or tilt sensor are detected. It is characterized in that the size and diameter of the disk is determined based on the relative detected movement amount.

[Embodiment] An embodiment of the present invention will be described below with reference to FIGS. 1 to 6. First, the disc player shown in FIGS. 1 and 2 is designed to determine the size and diameter of the disc 3 when the disc 3 is loaded into the player main body 1 at a constant speed by the driving of the loading motor 4. This is what I did. In the figure, the same components as those of the conventional disc player described above are denoted by the same reference numerals, and detailed explanation thereof will be omitted. Thus, in this embodiment, when the disc 3 is shaken by the loading tray 2 and loaded into the player body 1, light is emitted from the tilt sensor 12 attached to the pickup 9 for reading disc information. . Then, the tilt sensor 1 detects the point where the light emitted from the tilt sensor 12 first hits the disk 3.
The microcomputer 11 detects the detection signal based on the detection signal from the sensor 2.

The tilt sensor 12 continues to detect the disc 3 for a certain predetermined period of time when the disc 3 is roughly inserted into the player body 1, and a detection signal from the tilt sensor 12 is sent to the microcomputer 11 during that time. Then, the size and diameter of the disk 3 is determined by the microcomputer 11 from the detected movement amount. Incidentally, in the case of a disc player that can use a video disc 3a with a size diameter of m1 and a video disc 3b with a size diameter of m2 (ml > m2), the tilt sensor 1
2 is the distance a from the center of the position where the video disc is set in the player body 1 (the drive shaft of the spindle motor 8).
They are placed at positions separated by (a<m2). Then, the amount of disk movement λ detected by the tilt sensor 12
(am) is the size diameter m, (c
J21 (Cm) for the video disc 3a of size m), and J21 (Cm) for the video disc 3b of size diameter m2 (am).
22 (am).

Therefore, the time during which the tilt sensor 12 continues to detect the disc is as follows, assuming that the moving speed at which the video disc is inserted into the player body 1 is -27 (Cm/S e C).
For a video disc 3a with a diameter of mt (am), i
t /v (sea>), for the video disc 3b with a size diameter of m2 (cm), it becomes n2/y (sec), and this detection time is obtained by calculation processing by the microcomputer 11, and the size diameter of the disc and the tape is determined from this time difference. Fig. 4 shows a flowchart for determining the size and diameter of the disc in this case by the microcomputer 11.To briefly explain this, a time limit counter is started at the same time as loading starts; After that, when the disk is detected by the tilt sensor 12, a counter for detecting the movement amount of the disk starts.If the count value is larger than 1 in the threshold 1 hold parameter, the video of size diameter m, (am) is started. If the disc 3a is smaller, it is determined to be a video disc 3b with a diameter of m2 (am).The disc must be detected by the tilt sensor 12 while the loading tray 2 is inserted all the way into the player body 1. For example, it is determined that the disc is not placed on the loading tray 2.

In the above-described embodiment, the size and diameter of the disc 3 is determined while the disc 3 is inserted into the player body 1, but the size and diameter of the disc 3 is not limited to this, and for example, although not shown, After the disc 3 is inserted into the player body 1, the tilt sensor 12 may be moved in the radial direction of the disc, and the size and diameter of the disc 3 may be determined from the detected movement amount. In addition to the tilt sensor 2, for example, the disk surface may be irradiated with a laser beam emitted from the pickup 9, and the size and diameter of the disk may be determined from the detected movement d.

Incidentally, in the above embodiment, a VD player was explained, but the present invention can also be applied to a VD-CD player. In this case, as shown in FIG.
may be placed at a position (a<m3) where the movement of the compact disc 3G having a diameter of m3 (cm) can also be detected. Then, the microcomputer 11 determines the difference in the amount of movement detected by the tilt sensor 12 between the video discs 3a, 3b and the compact disc 3C, and determines which disc has been carried into the player body 1. FIG. 6 shows a flowchart of the control of the microcomputer 11 in this case, but since the means are substantially the same as in the case of FIG. 4, the explanation will be omitted.

[Effect of the invention] As is clear from the above description of the embodiments,
According to the present invention, in a disc player that can use discs of different sizes and diameters, the size and diameter of the disc is determined using a pickup or a tilt sensor necessary for reading disc information, so the number of parts can be reduced. Therefore, manufacturing costs can be reduced, and the structure can also be simplified, making it possible to make the disc player more compact.

[BRIEF DESCRIPTION OF THE DRAWINGS] The drawings relate to one embodiment of the present invention, in which Fig. 1 is a sectional view showing the schematic structure of a disc player, Fig. 2 is a diagram of its operating state, and Fig. 3 is a diagram showing the size of the disc. An explanatory diagram of diameter determination, FIG. 4 is a flowchart thereof, FIG. 5 is an explanatory diagram of disc size diameter determination in another embodiment, FIG. 6 is a flowchart thereof, and FIG. 7 is a schematic configuration of a conventional disc player. A sectional view, FIG. 8 is a schematic explanatory view of the main parts, and FIG. 9 is a perspective view of the external appearance. 1... Player body, 2... Loading tray,
3...disc, 9...pickup, 12...
Tilt sensor.

Claims (1)

[Claims] In a disc player that can use discs of different sizes and diameters, when or after the disc is loaded into the player body by a loading mechanism, the disc is disposed within the player body for reading information on the disc. The disk is detected by a pickup or a tilt sensor for detecting disk warpage attached to the pickup, and the size and diameter of the disk is determined based on the detected relative movement amount between the disk and the pickup or the tilt sensor. Disc size detection method for disc players.