JPH0690849B2 - Disk detection device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention will be described in the following order.

A Industrial field B Outline of the invention C Conventional technology (Figs. 7 to 11) D Problems to be solved by the invention E Means for solving problems (Figs. 1 and 2) F Action (FIGS. 1 and 2) G Embodiment (FIGS. 1 to 6) H Effect of the invention A Industrial field of application The present invention relates to a disk detection device, and particularly when mounting a disk on a disk player. In addition, the size of the disk is detected.

B. Summary of the Invention The present invention represents the size of the mounted discs in a disc player in which the disc table mounted with the discs is loaded on the player body so as to be arranged in the loading operation direction of the disc table. By disposing a plurality of through holes, the number of disk detection elements can be halved compared to the conventional case.

C Conventional Technology Conventionally, in a disc player such as a video disc player and an audio disc player, when a disc is loaded correctly, as a means for starting a playback operation in a playback operation mode according to the size of the loaded disk, A disk detection device for discriminating the size of the disk is provided. For example, an optical disk player disclosed in Japanese Patent Laid-Open No. 57-210480 has been proposed. This conventional disk detecting device is adapted to detect the radius of the disk based on the rise time of the disk by utilizing the fact that the inertia moment of the disk is proportional to the square of the radius.

Further, as a conventional disk detection device used in a video disk player, there is one having a configuration shown in FIGS. This disc detection device is for discriminating whether or not a disc is mounted and detecting the size of the mounted disc in a front loading type video disc player capable of using 12-inch and 8-inch discs. It is configured as follows.

In FIG. 8, reference numeral 1 is a disk table, and as shown in FIG. 9, it is drawn in from the insertion window 3A provided on the front panel of the player body 3 of the disk player 2 in the direction indicated by the arrow a1, or in the opposite direction. It is installed so that it can be pulled out. A push-push type opening / closing command push button switch 4 is provided on the front end surface of the disk table 1.

On the upper surface of the disk table 1, as shown in FIG.
It has a circular step 6 into which a small-diameter disk (that is, an 8-inch disk) 5B can be fitted, and concentrically with a circular step 7 into which a large-diameter disk (that is, a 12-inch disk) 5A can be fitted. There is. Further, a circular spindle insertion hole 8 having a diameter larger than the diameter of the spindle is formed at the center of the circular step portions 6 and 7.
When the disk 5A or 5B is mounted on the spindle, the spindle can be inserted through the spindle insertion hole 8 from the lower side and protruded above the disk table 1.

The spindle insertion hole 8 communicates with a notch 9 extending in the direction of the arrow a1, and when the disc 5A or 5B is mounted on the spindle, an optical pickup for reading information from the discs 5A and 5B is provided with this notch. Disk 5A or 5B without hitting disk table 1 using 9
It can be positioned at a position opposite to.

As shown in FIG. 9, when the disk table 1 is pulled out from the player main body 3, by fitting the small-diameter disk 5B or the large-diameter disk 5A into the circular step portion 6 or 7, the disk is removed. It is installed. In this state, when the open / close command push button switch 4 is operated, the disk table 1 starts the loading operation of the disk 5B or 5A, and the loading mechanism (not shown) causes an arrow to appear.
is drawn into the player body 3 in the direction indicated by a1,
When it reaches the position on the center 13 of the spindle 12 which is rotated by the spindle motor 11 driven by the drive output S1, it descends in the direction of the spindle 12 as shown by the arrow a2, and then on the turntable 15. A state in which the disk 5A or 5B is held in the chucking state is obtained, and a series of loading operations is completed.

Whether the disk mounted on the disk table 1 is the large-diameter disk 5A during the loading operation,
Alternatively, in order to detect whether or not it is the small-diameter disk 5B, the disk detection elements 14A and 14B of the reflection type photodetector configuration are arranged in the vicinity of the spindle 12, for example.

On the other hand, the circular step portions 6 and 7 of the disk table 1 are provided with through holes 16 and 17, respectively, and as shown in FIG. 10, a large diameter disk 5A or a small diameter disk 5B is fitted into the step portion 7 or 6. In this state, when the disk table 1 carries out the loading operation in the direction of the arrow a1 and moves on the loading locus RW to reach the position of the center 13 of the spindle 12, the through hole 17 and
16 will overlap on the disk detection elements 14A and 14B.

This state is maintained even when the disk table 1 is lowered and the small-diameter disk 5B or the large-diameter disk 5A is chucked on the spindle 12, and thus the disk detection outputs DT1 and DT2 from the disk detection elements 14B and 14A.
Is generated and supplied to the system control circuit 20.

Here, a small-diameter disk is attached to the circular step 6 of the disk table 1.
When 5B is mounted, the disk detection element 14B on the small-diameter disk 5B side can receive the reflected light through the through hole 16, whereas the disk detection element 14A has no disk covering the through hole 17. The reflected light cannot be received, so that the detection outputs DT1 and DT2 are at the logic "1" and logic "0" levels, respectively, as shown in FIG. At this time, the system control circuit 20 determines that the small-diameter disk 5B is on the disk table 1.

On the other hand, when the large-diameter disk 5A is mounted on the circular step portion 7 of the disk table 1, both the through holes 16 and 17 are covered by the disk 5A, so that the disk detection elements 14A and 14B are provided. Since the reflected light can be received, both the disk detection outputs DT1 and DT2 rise to the logic "1" level. At this time, the system control circuit 20 determines that the large-diameter disk 5A is on the disk table 1.

Further, when the disk is not mounted on the disk table 1, both the through holes 16 and 17 are not covered by the disk, so that the disk detection outputs DT1 and DT2 both become the logic "0" level. The system control circuit 20 determines that the disk is not attached.

With this configuration, the size and presence / absence of the disk mounted on the disk table 1 can be determined during the loading operation, and the system control circuit 20 determines the operation mode at the time of reproduction based on the determination result. You can choose.

When the light emitted from the disk detection elements 14A and 14 is irradiating the bottom surface of the disk table 1, this irradiation light is absorbed and reflected light cannot be obtained.

D. Problem to be Solved by the Invention However, according to the above-mentioned conventional configuration, two disk detection elements must be provided around the spindle as a means for determining the presence or absence and the size of the disk.
It is still insufficient to simplify the structure in practical use.

Incidentally, since various members such as a spindle motor, an optical pickup tracking mechanism, and a loading mechanism of the video disk must be arranged around the spindle where the video disk is checked, the number of disk detecting elements should be minimized. It is desirable to reduce it.

The present invention has been made in consideration of the above points, and an object thereof is to propose a disk detection device capable of reducing the number of disk detection elements by half as compared with the conventional case.

E Means for Solving Problems In the present invention, in order to solve the problems, a disk selected from a plurality of kinds of disks 5A and 5B is mounted on the disk table 1, and the disk table 1 is loaded on the player body 3. In the disk player configured to load the mounted disk onto the spindle 12 by operating the disk, various kinds of disks are drilled so as to penetrate through the disk table 1 at the mounting portions where the disk is mounted on the disk table 1. And a plurality of through holes 22 and 23 arranged so as to be arranged in the loading operation direction to the spindle 12 of the disk table 1,
When the disk table 1 carries out the loading operation, it has a disk detecting element 21 arranged at a position where a plurality of through holes 22 and 23 sequentially pass, and the plurality of through holes 22 and 23 sequentially reach the position of the disk detecting element 21. Each time, the disk detection output DT3 indicating this is obtained from the disk detection element 21, and the size of the mounted disk is determined based on the disk detection output DT3.

F action One type of disc 5A or 5B selected from a plurality of types of discs is mounted on the dedicated mounting portion 6 or 7 of the disc table 1, and the disc table 1 is caused to start the loading operation on the player main body 3.

At this time, the disk table 1 is drawn into the player body 3 while passing through the loading locus until the mounted disk 5A or 5B is mounted on the spindle, but the disk table 1 is drilled in each disk mounting portion 6 or 7. Since the through holes 22 or 23 are arranged in the direction corresponding to the loading direction of the disk table 1, the through holes 22 or 23 sequentially pass through the position of the disk detecting element 21.

As a result, each time the through hole 22 or 23 passes, the disk detection element 21 obtains a disk detection output DT3 indicating whether or not the disk corresponding to the through hole 22 or 23 is mounted. Thus, the output waveform of the disk detection output DT3 changes over time corresponding to the disk mounting state represented by the through holes 22 or 23, respectively.

Thus, the size and presence / absence of the disk mounted on the disk table 1 can be determined based on the change in the detection output DT3 of the disk detection element 21.

In this way, the number of disk detecting elements 21 need only be one, so that the number of disk detecting elements can be halved as compared with the conventional case.

G Embodiment An embodiment in which the present invention is applied to a front loading type video disk player will be described in detail below with reference to the drawings in which the same reference numerals are given to the corresponding portions in FIGS. 7 to 11.

In the case of this embodiment, as shown in FIG. 1, a circular step portion 7 into which a large-diameter disk 5A is fitted is mounted on the disk table 1.
Through hole 23 and circular step 6 into which the small-diameter disk 5B is fitted
Is a virtual line that is almost parallel to the loading direction a1.
It is drilled so as to be arranged on the LB.

On the other hand, a disk detector with a reflective photodetector configuration
As shown in FIG. 2, 21 is arranged at a front position of the spindle 12 (for example, a position near the insertion window 3A), and thus, when the disk table 1 is pulled toward the center 13 of the spindle 12, it is transparent. When the disks 5A and 5B are mounted on the disk table 1 by passing the holes 23 and 22 successively above the disk detecting element 21, the through hole 2
Reflected light can be obtained from 3, 22 and the disc detection output DT3 thus obtained is supplied to the system control circuit 20.

In the above configuration, when the disk table 1 is pulled out from the player main body 3, first, when the large-diameter disk 5A is mounted and the open / close command push button switch 4 is operated, the disk table 1 starts the loading operation. Start. As a result, the disk table 1 passes the position of the disk detecting element 21.

At time t ₁ in FIG. 4, when the through hole 23 comes to a position facing the disk detection element 21, the reflected light from the disk 5A is obtained through the through hole 23 in the disk detection element 21, and the disk detection output DT3 The logic level rises from the logic "0" level to the "1" level, as shown in FIG.

In this state, when the through hole 23 has finished passing the position of the disk detection element 21, the disk detection output DT3 of the disk detection element 21 falls to the logic "0" level.

Disc table 1 is then also went continues pulled in the direction of arrow a1, disc detecting element 21 is in a state facing the through hole 22 at the time t ₂ of the eventually Figure 4. At this time, the disk detection output DT3 rises to the logic "1" level again, and then falls to the logic "0" level when the through hole 22 passes the position of the disk detection element 21.

After that, the disk table 1 is continuously pulled in the direction of the arrow a1, and eventually the disk 5A is brought to the position of the center 13 and lowered in the direction of the arrow a2 to cause the spindle 12 to check. At this time, the disk detection element 21
The disk detection output DT3 maintains a logic "0" level because no reflected light is obtained in both the state of facing the bottom of the disk table 1 and the state of the disk table 1 passing by and not facing. To do.

Thus, the system control circuit 20 receives the time points t ₁ and t ₂ before completing one loading operation.
Disk detection output with two pulses generated at
DT3 will be supplied. At this time, in the system control circuit 20, the large diameter disk 5A
It is determined that it was attached to.

When small-diameter disk 5B has been mounted on the circular step portion 6 of the disk table 1 in a state of being pulled out against this, as shown in FIG. 4 (B), the through hole 23 at time t ₁
When the disk detection element 21 comes to the position, since the through hole 23 is not covered by the disk, reflected light cannot be obtained from the disk detection element 21, and accordingly the disk detection output DT3 becomes the logic "1". "Don't rise to the level, and logic" 0 "
Maintain the level.

After that, when the through hole 22 comes to the position of the disk detecting element 21 at time t ₂ , the through hole 22 is covered with the disk 5B, so that the reflected light is obtained at the disk detecting element 21. Output DT3 rises to logic "1" level. Then, when the through hole 22 passes the position of the disk detection element 21 thereafter, the disk detection output DT3 becomes the logic "0".
Get down to the level.

Thus disc detection output DT3 from disc detecting element 21 with one pulse at time t ₂ to the system control circuit 20 is supplied, thereby the system control circuit 20 is small disc 5B to disc table 1
Can be determined to have been attached.

On the other hand, when the disks 5A and 5B are not mounted on the disk table 1 that has been pulled out, FIG.
As shown in, when the through holes 23 and 24 sequentially pass through the position of the disk detection element 21 at the time points t ₁ and t ₂ , the through holes 23,
Since 22 is not covered by the disk, no reflected light is obtained at the disk detecting element 21, and therefore, a rising pulse to the logic "1" level does not occur.
Therefore, it can be determined that the system control circuit 20 and the disk table 1 have no disks installed.

According to the configurations shown in FIGS. 1 to 4, as described above, the presence / absence of the disk mounting and the size of the disk can be reliably determined by providing only one disk detecting element 21.

FIG. 5 shows another embodiment of the present invention. In this case, the disk detecting element 21 is the same as in the case of FIG.
The structure is the same as that of FIG. 3 except that when 5A or 5B comes to the position where it is mounted on the spindle 12, it is arranged so as to face the through hole 22.

In the embodiment of FIG. 3, when the disk table 1 carries out the loading operation with respect to the spindle 12, the through hole 23 of the disk table 1 first passes the position of the disk detecting element 21 and then the through hole 22 is moved to the disk detecting element 21. When the disk position is reached, the disk table 1 operates so as to descend toward the spindle 12.

Therefore, when the large-diameter disk 5A is mounted on the disk table 1, the disk detection output of the disk detection element 21.
DT3, as shown in FIG. 6 (A), a pulse which rises to a logic "1" level occurs when the through hole 23 comes to the position of the disk detection element 21 at time t _11, Toru in the subsequent time t ₁₂ When the hole 22 comes to the position of the disk detection element 21, the disk detection output DT3 rises to the logic "1" level.

However, in the case of this embodiment, since the through hole 22 continues to face the detection element 21 even during the operation until the large-diameter disk 5A completes the checking of the spindle 12, the disk detection output DT3 is logical. Maintain a "1" level.

Further, when the small-diameter disk 5B is mounted on the disk table 1, as shown in FIG. 6 (B), when the through hole 23 passes the position of the disk detecting element 21 at time t ₁₁ , it becomes the logic “1” level. No rising pulse is generated,
With disc detection output DT3 when hole 22 comes to the position of the disk detection element 21 rises to a logic "1" level at time t _22, then to maintain this logic level.

Further, when neither the large-diameter disk 5A nor the small-diameter disk 5B is mounted on the disk table 1, the disk detection output DT3 maintains the logic level "0" as shown in FIG. 6 (C).

Therefore, as shown in FIG. 6 (A), the system control circuit 20 obtains the disk detection output DT3 that keeps the logic "1" level after one pulse of the logic "1" level is obtained. Then, it can be determined that the large-diameter disk 5A is mounted on the disk table 1, and as shown in FIG. 6 (B), the disk detection output DT3 that maintains the logic "1" level is acquired. When it is answered, it can be determined that the small-diameter disk 5B is mounted on the disk table 1,
Further, as shown in FIG. 6C, when the disk detection output DT3 that does not rise to the logic "1" level is obtained, it can be determined that the disk is not mounted on the disk table 1.

Even in this case, the number of disk detection elements 21 can be reduced by half as compared with the conventional case in the same manner as the above case.

In the above description, the case where the present invention is applied to a disk player capable of mounting two types of disks having different sizes has been described. The invention can be applied.

Further, in the above-described embodiment, the case where the reflection type photodetector is used as the disk detection element has been described, but even if the light transmission type photodetector is used, the same effect as the above case can be obtained. it can.

Further, in the above-described embodiments, the present invention is described as an embodiment applied to a front-flowing type disk player, but the present invention is not limited to this, and the point is that the present invention is widely applied to a type of disk player that performs a loading operation. obtain.

Further, in the above-mentioned embodiment, the case where the loading locus to the spindle is a straight line has been described, but instead of this, the present invention is also applicable to the case where the locus of loading along various curves such as an arc and a parabola is provided. Can be applied.

Further, in the above-described embodiment, the case where the disk detecting element 21 is arranged in the vicinity of the insertion window 3A (FIG. 2) or in the periphery of the spindle 12 (FIG. 5) has been described, but the present invention is not limited to this. May be arranged at such a position that the through holes 23 and 22 can pass through the disk detecting element 21 while the disk table 1 is performing a series of loading operations.

H Effect of the Invention As described above, according to the present invention, there is provided a disk detecting device capable of surely determining the size of the disk mounted on the disk table 1 and the presence / absence of the disk by using one disk detecting element. It can be easily realized.

[Brief description of drawings]

FIG. 1 is a perspective view showing a disk table constituting a main part of a disk detecting device according to the present invention, FIG. 2 is a schematic side view showing an embodiment of a disk detecting device according to the present invention, and FIG. 3 is a disk. FIG. 4 is a schematic diagram showing the arrangement of the detecting elements, FIG. 4 is a signal waveform diagram showing the disk detection output, FIG. 5 is a schematic diagram showing the arrangement of the disk detecting elements in another embodiment of the present invention, and FIG. FIG. 5 is a signal waveform diagram showing a disk detection output in the case of FIG. 5, FIG. 7 is a perspective view showing a conventional disk table, FIG. 8 is a perspective view showing the entire structure of a disk player, and FIG. 9 is a conventional disk detection. FIG. 10 is a schematic side view showing the configuration of the device, FIG. 10 is a schematic diagram showing the arrangement of the disk detection elements, and FIG. 11 is a table showing the determination operation of the system control circuit. 1 ... Disk table, 2 ... Disk player, 3
...... Player player, 4 …… Open / close command push button switch,
5A, 5B ... Large diameter, small diameter disk, 6,7 ... Circular step,
8 ... Spindle insertion hole, 9 ... Notch, 11 ... Spindle motor, 12 ... Spindle, 14A, 14B ... Disk detection element, 15 ... Turntable, 16, 17, 22, 23 ...
Through hole.

Claims (1)

[Claims] 1. Disks of different sizes can be mounted on the disk table, and a desired disk is mounted on the disk table, and the disk table is loaded on the player main body so that the mounted disk can be spindle-mounted. In a disk player adapted to load the disk table, the disk table is formed at a position corresponding to the size of the disk so as to penetrate the disk table, and a loading operation direction of the disk table to the spindle. A plurality of through holes arranged so as to be arranged in a row, and a detection for detecting the size of the disk arranged at a position where the plurality of through holes sequentially reach in response to the loading operation of the disk table. An element and the plurality of through holes are sequentially arranged in the detection element. Disk detecting apparatus characterized by determining the size of the disk mounted on the disk table based on reaching the position in the detection output obtained corresponding.