JPH0643894Y2 - Disc player - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION "Industrial application field" The present invention relates to a carousel type disc player in which a plurality of discs are juxtaposed on the same circumference of a rotatable tray.

"Prior art" Conventionally, a disc presence hole and a disc position hole were provided on the same circumference centered on the fulcrum axis of the tray, and the presence or absence of a disc and a specific disc position were determined by a disc sensor such as a photoconductive semiconductor (phototransistor). There was a technology to detect.

[Problems to be Solved by the Invention] In the prior art, since the disc presence hole and the disc position hole are identified by the difference in the detection time width, the tray rotation speed is determined by the motor performance of rotating the tray and the rotation resistance of the tray. When the (speed) changes, the preset time width and the detection time width of each hole differ, making it impossible to identify each hole, so a highly accurate structure that keeps the rotation of the tray constant is provided. It is necessary for manufacturing and assembling to have accuracy required to prevent quality differences (rotation of trays) between products. For example, even when the tray is temporarily stopped at the hole with the shorter detection time width, There was also a problem in handling operation such that each hole was erroneously detected.

"Means for Solving Problems" However, in the present invention, a tray having a plurality of disk mounting surfaces is rotatably attached by a fulcrum shaft, and a plurality of disk mounting surfaces are arranged on the same circumference around the fulcrum shaft. Along with
A disk presence / absence hole for detecting the presence / absence of a disk and a disk position hole for identifying each disk are arranged on the same circumference around the fulcrum shaft of the tray, and a disk sensor is used to detect the disk through each hole. In a disc player that detects the presence or absence of a disc and the position of a specific disc, a rotation sensor that detects the number of rotations of the tray is provided. Based on the rotation speed of the tray that is detected by the rotation sensor, the disc presence hole and the disc position hole that are detected by the disc sensor are set. It is characterized by being configured to identify.

Therefore, the presence / absence hole and the position hole are detected based on the rotation speed of the tray. For example, when the tray is at low speed, the detection time width of each hole becomes longer in proportion to the rotation speed, while the tray is operated at high speed. At this time, the detection time width of each hole becomes shorter in proportion to the number of rotations, and even if the rotation speed of the tray changes, it is possible to accurately detect the difference in the relative detection time width of each hole. The identification can always be performed properly, the tray mounting structure and the disc loading mechanism can be simplified and the manufacturing cost can be easily reduced as compared with the conventional method, and the false detection of each hole due to the non-constant rotation of the tray can be performed. It is possible to easily improve the handling operability by preventing it.

[Example] Hereinafter, an example of the present invention will be described in detail with reference to the drawings. First
Figure is the control circuit diagram of the main part, Figure 2 is the plan view of the tray, and Figure 3
The figure is a side view explanatory view, in which a rectangular flat plate-shaped tray frame (2) is provided in a disc player main body case (1) so as to be freely inserted and removed, and a circular flat plate-shaped tray (3) is provided as a fulcrum shaft of the frame (2). Attach it to (4) rotatably.

Also, compact discs with diameters of 12 cm and 8 cm (5)
A set of disk mounting surfaces (7) and (8) on which (6) is mounted,
5 sets of disc mounting surfaces (7) and (8) are formed on the tray (3), and 5 sets of disc mounting surfaces (7) and (8) are arranged on the same circumference around the fulcrum shaft (4). In addition to being installed, one of the disks (5) and (6) is chucked (not shown).
A turntable (9) held by a handheld, etc., and a leather pickup (10) that reads information from the disks (5) and (6)
The turntable (9) and the pickup (10) are attached to a reproduction chassis (11) which is provided in the main body case (1) and is vertically movable.

Further, an opening (12) for approaching the turntable (9) and the pickup (10) to the discs (5) and (6) is opened on the disc mounting surfaces (7) and (8), and the disc (5) is attached and detached. A concave portion (13) for making it is formed adjacent to the disk mounting surface (7).

Further, the first to fifth disc presence / absence holes (14) for detecting the presence / absence of the discs (5) and (6), and each disc (5)
First to fifth disc position holes (15) for identifying (6) ...
Are arranged on the same circumference with the support shaft (4) of the tray (3) as the center, and the disk presence / absence hole (14) formed in the circumferential direction is formed on the disk mounting surface (8). The disk positioning hole (15) formed in the radial direction in the radial direction to the tray (3) idle surface outside the disk mounting surface (7), and the first to fifth disks 1 to 5 are formed. Positioning holes (15) are provided, and the first to fifth disks (5) are provided.
(6) is specified.

It should be noted that the long side width dimension of the disc position hole (15) is formed larger than the total of the short side width dimensions of the maximum number of the fifth disc position holes (15) ...

Also, a tray motor (18) that is interlockingly connected to the tray (3) via gears (16) and (17), and a rotating plate (21) that is interlocked with the tray (3) via gears (19) and (20). And a phototransistor type disc sensor (23) for sensing the detection light from the light emitting diode (22) through the disc presence hole (14) or the disc position hole (15),
A phototransistor type rotation sensor that senses the detection light from the light emitting diode (25) through any one of a plurality of slits (24) of the same shape formed on the rotating plate (21) provided at equal intervals on the same circumference. (26) is provided.

Then, when the tray (3) is rotated by the tray motor (18), the presence / absence of the disks (5) and (6) is determined through the disk presence / absence hole (14), and is specified through the disk position hole (15). The positions of the disks (5) and (6) are detected by the disk sensor (23), and the rotation speed (speed) of the tray (3) is detected by the rotation sensor (26) through the slit (24) of the rotating plate (21). As shown in FIG. 4, the presence / absence signal or the presence / absence signal is detected by the output of the first to fifth disc presence signals (pulse wave) and the first to fifth disc position signals (pulse wave) from the disc sensor (23). The rotation number output (pulse number) from the rotation sensor (26) corresponding to the detection time (high level output) width of the position signal is counted, and the difference in the rotation number output (pulse number) of the rotation sensor (26) is calculated. Based on the 1st to 5th discs (5) is configured to perform presence detection and the position detection of (6).

Further, as shown in FIG. 1, 5 sets of disc mounting surfaces (7)
A disk selection switch (27) for selecting the first to fifth disks (5) and (6) of (8), and disks (5) and (6)
And a reproducing switch (28) for reading and reproducing the information of the above, and a disk control circuit (29) constituted by a microcomputer, in which each of the switches (27) and (28) and each sensor (2)
3) (26) is connected to the input and playback chassis (1
A chucking motor (30) that raises (1) to fix the disks (5) and (6) to the turntable (9).
A turntable motor (31) for rotating the turntable (9) and a pickup motor (32) for linearly moving the pickup (10) to and from the turntable (9). ) (31) (32) and the tray motor (18) are output-connected to the disk control circuit (29).

The disc presence hole (14) and the disc position hole (15) detected by the disc sensor (23) are discriminated from each other based on the rotation speed (rotation speed) of the tray (3) detected by the rotation sensor (26). The specific discs (5) and (6) are automatically selected by controlling the motor (18), and the selected discs (5) and (6) are fixed to the turntable (9) by controlling the chucking motor (30). , The information of the disks (5) and (6) on the turntable (9) is reproduced by controlling the turntable motor (31) and the pickup motor (32).

This embodiment is configured as described above, and the main body case (1)
The tray frame (2) is moved in and out of the tray, the discs (5) and (6) are placed on the disc mounting surfaces (7) and (8) of the tray (3), and the disc (5) (which is reproduced by the disc selection switch (27) ( 6) and select the playback switch (2
8) The tray motor (18) is operated by the operation to rotate the tray (3).

Then, as shown in the flow chart of FIG. 5, when the tray (3) is rotating, the input of the rotation sensor (26) is reset by the rise of the pulse input of the disc sensor (23), and the disc sensor (23) is turned on. In the high level output state, the rotation sensor (26) input is added once by the pulse input rise of the rotation sensor (26), and the tray (3)
The number of revolutions (A) of the first disc is calculated as shown in FIG. Two pulses are calculated as the number of revolutions (A) by the position signal by the position detection, and four pulses are generated by the second disk position signal, and an even multiple of 6-10 pulses is also generated by the third to fifth disks. , And the above-mentioned rotational speed (A), respectively.

In addition, the pulse input falling edge of the disc sensor (23) detects the number of 14 pulses for detecting the presence or absence of the discs (5) and (6) and the maximum of 10 for detecting the position of the discs (5) and (6).
The number (11, 12, or 13) between the number of pulses is set as the discrimination determination value, and when the rotation speed (A) is larger than the discrimination determination value, it is determined that the disc presence signal is detected. When the number of rotations (A) is smaller than the discrimination determination value, the disc position signal detection is determined.

Therefore, even if the rotation speed of the tray (3) changes and the pulse width of the presence signal and the position signal output from the disk sensor (23) also changes, the pulse width and pulse period output from the rotation sensor (26). Also changes proportionally, the presence or absence and position detection of the disks (5) and (6) are always detected with a constant number of pulses (rotation number = A) regardless of the rotation change of the tray (3). Based on the rotation speed of the tray (3) detected by the sensor (26), the disc presence hole (14) and the disc position hole (15) detected by the disc sensor (23) are always accurately identified.

Further, as shown in the flow chart of FIG. 6, the selected disc (5) is detected based on the disc position signal detection of FIG.
When (6) moves to the playback position above the turntable (9), the tray (3) stops and the discs (5) and (6) are chucked to the turntable (9) to fix the disc (5). ) When the information of (6) is read and reproduced, the reproduction of the discs (5) and (6) is completed, or the selected discs (5) and (6) are not on the disc mounting surfaces (7) and (8). At this time, the operation proceeds to the selection and reproduction operation of the next selected disk (5) (6) and the reproduction of the selected disk (5) (6) is sequentially performed, while an alarm is displayed when there is no disk (5) (6) Is also done.

[Advantages of the Invention] As is apparent from the above embodiments, according to the present invention, the tray (3) having a plurality of disk mounting surfaces (7) and (8) is rotatably attached by the fulcrum shaft (4), and the fulcrum shaft (4 ) Is arranged on the same circumference with a plurality of disc mounting surfaces (7) and (8), and disc presence holes (14) for detecting the presence or absence of the discs (5) and (6), and each disc ( 5) A disc position hole (15) for identifying (6) is provided in the tray (3).
Of the discs (5) and (6) through the holes (14) and (15) through the holes (14) and (15) and the specific discs (5) and (6). 5) A rotation sensor (26) that detects the number of rotations of the tray (3) in a disc player that detects the position (6).
The disc sensor (23) detects the disc presence hole (14) and the disc position hole (15) based on the rotation speed of the tray (3) detected by the rotation sensor (26). Since the presence hole (14) and the position hole (15) are detected based on the rotation speed of 3), for example, when the tray (3) is at a low speed, the detection time width of each hole (14) (15) becomes the rotation speed. On the other hand, when the tray (3) is at a high speed, the detection time width of each hole (14) (15) becomes shorter in proportion to the number of rotations, even if the rotation speed of the tray (3) changes. The difference between the relative detection time widths of the holes (14) (15) can be accurately detected, and the holes (14) (15) can always be properly identified. 3)
The mounting structure and the disc loading mechanism can be simplified and the manufacturing cost can be easily reduced, and the holes (1) can be formed by rotating the tray (3) at a non-constant speed.
4) The false detection of (15) can be prevented and the handling operability can be easily improved.

[Brief description of drawings]

FIG. 1 is a control circuit diagram of essential parts showing an embodiment of the present invention, FIG. 2 is a plan view of a tray, FIG. 3 is a side view, and FIG.
The drawings are output diagrams of the disk sensor and the rotation sensor, and FIGS. 5 and 6 are flowcharts. (3) …… Tray (4) …… fulcrum shaft (5) (6) …… Disc (7) (8) …… Disc mounting surface (14) …… Disc presence hole (15) …… Disc position hole ( 23) …… Disk sensor (26) …… Rotation sensor

Claims (1)

[Scope of utility model registration request] 1. A tray having a plurality of disk mounting surfaces is rotatably mounted on a fulcrum shaft, the plurality of disk mounting surfaces are arranged on the same circumference centered on the fulcrum shaft, and the presence or absence of a disk is detected. A disk presence / absence hole and a disk position hole for specifying each disk are arranged on the same circumference around the fulcrum shaft of the tray, and the presence or absence of the disk and the specific disk position are detected by the disk sensor through the holes. In the disc player for detecting the disc, a rotation sensor for detecting the number of rotations of the tray is provided, and the disc presence hole and the disc position hole detected by the disc sensor are discriminated based on the rotation speed of the tray detected by the rotation sensor. A disc player characterized in that