JP2604737Y2 - Disk detection device - Google Patents

Description

[Detailed description of the invention]

[0001]

The present invention is applicable to 8cm CD and 12c.
The present invention relates to a disk detection device that prevents erroneous detection in determining the size of an mCD.

[0002]

2. Description of the Related Art In recent years, a multi-type CD player (hereinafter simply referred to as a CD) capable of continuously playing a plurality of CDs.
Players) have become widespread. The basic structures of the car and home players have many similar parts.

As a major difference, when paying attention to a CD player for a car, securing of an installation space, humidity, vibration, dust, operability, etc. are considered due to special conditions of use in a car.

FIGS. 1 and 2 show a CD for such a car.
1 shows an example of a player, a magazine loading mechanism 200 into which a magazine 100 is loaded, an extrusion mechanism 300 that selects a predetermined tray from the magazine 100 and pushes the tray to the turntable side, and clamps a CD from the pushed tray to a turntable. Clamp mechanism 400, clamped C
A reproducing mechanism 500 for reading information recorded in D is provided, and a power transmission system 600 for interlocking movement between these mechanisms.

[0005] In the magazine 100, trays 101 are accommodated in multiple stages. On the side surface of the magazine 100, extrusion windows 102 corresponding to the number of storage trays 101 are formed.

In the magazine 100, as shown in FIGS. 3 (a) and 3 (c), for example, a tray 101A for storing a disk D1 of 12 cm size and a tray 101B for storing a disk D2 of 8 cm size are provided. It is stored. The trays 101A and 101B are provided with receiving portions 101d and 101e, respectively, which are adjusted to the dimensions of the disks D1 and D2.

To play one of the discs, the pushing lever 301 of the pushing mechanism 300 is rotated, and the leading end of the pushing lever 301 is pushed out of the pushing window 102 corresponding to the selected tray 101.
Pushed into. As a result, the tray 101 is
3 and is sent to the reproducing mechanism 500 side.

At this time, the rotation cam 610 rotates in synchronization with the rotation of the tray 101, and the tray position detection switch 632 and the CD position detection switch 634 are operated.

That is, the tray position detection switch 6
When the switch 32 is turned on, the rotation start time and the rotation end time of the tray 101 are detected. When the CD position detection switch 634 is turned on, the detected position of the CD is notified.

A detection sensor P is provided in the course of rotation of the tray 101, and the detection sensor P detects a disk size and the presence or absence of a disk. The detection timing of the disk size and the presence / absence of the disk by the detection sensor P is determined by the CD position detection switch
This operation is performed in accordance with the ON operation of S.34.

A turntable 501 is provided below the motor 502. A stepping motor 504 for providing a moving force to the pickup 510 is arranged near the motor 502. A guide rail 511 for guiding the pickup 510 is provided at a position sandwiching the motor 502.

In the CD player having such a configuration, the disc size is first detected before the performance of the selected disc is started. That is, when the tray 101A accommodating the disk D1 having a size of 12 cm is sent out to the turntable 501, the position where the disk size is to be detected shown in FIG. Is detected.

In this position, as shown in FIG.
By detecting the reflected light from the disk D1 by the detection sensor P, detection of a size of 12 cm can be performed. As shown in FIG. 3C, when the tray 101B containing the disc D2 of 8 cm size reaches the same position, as shown in FIG.
By taking in the reflected light from the outer peripheral edge of 01B, 8
cm size detection can be performed.

After the detection of the disk size is completed, the trays 101A and 101B are further pushed out to the turntable 501 side.

When the tray 101A reaches the position shown in FIG.
As shown in (b), the detection sensor P takes in the reflected light from the disk D1 to detect that the disk D1 is stored in the tray 101A. On the other hand, FIG.
As shown in (c) and (d), the detection sensor P
By taking in the reflected light from the storage section 101d of 01A, it is possible to detect that the disk D1 is not stored in the storage section 101d of the tray 101A. The presence or absence of the disc D2 having the size of 8 cm can be detected in the same manner.

[0016]

As described above, in the above-described conventional CD player, the reflection type detection sensor P is used to detect the disk size and the presence / absence of the disk. In such a reflection type detection sensor P, for example, since the light emitting unit and the light receiving unit are integrally formed, not only the number of components related to the disk detection is reduced as much as possible, but also the detection position accuracy of the detection sensor P is reduced. There is an advantage that strictness is not required for the adjustment.

FIG. 5 conceptually shows the position detected by the detection sensor P described above. That is, the detection point A1 for detecting the disk size is located at a position deviated from the disk D2. The detection point B1 for detecting the presence or absence of a disk is disks D1, D2.
It is in the position which overlaps.

The detection result by the detection sensor P at this time is, for example, as shown in FIG. However, the detection sensor P in this case has an output characteristic that is inversely proportional to the amount of reflected light.

That is, the distance A shown in FIG. 3 is the distance from the disk surface and the disk storage surface of the tray shown in FIGS. 3B and 4D, and B is the distance shown in FIG.
This is the distance from the tray surface (the outer peripheral edge of the tray) shown in (d). Therefore, from the characteristic diagram shown in FIG. 6, the detection of the disk size is determined by the detection point a or b. The detection of the presence or absence of the disk is determined by the detection point a or c.

For this reason, the threshold for detecting the disk size and the presence or absence of the disk by the detection sensor P is set between the detection points a and c.

However, when the trays 101A and 101B vibrate during detection by the detection sensor P, the detection points a and b of the sensor output move in the directions of the arrows due to changes in the amount of reflected light. Therefore, the detection point a
When the position of the detection point b decreases and the position of the detection point b decreases, the setting range of the threshold value is further narrowed. Therefore, if the sensor output fluctuates due to the vibration of the tray, there is a problem that erroneous detection is likely to occur in disc size discrimination.

The present invention has been made in view of such circumstances, and has an allowance for a range of thresholds to be set for disc discrimination, thereby preventing occurrence of erroneous detection of disc size discrimination. It is an object of the present invention to provide a disk detection device capable of performing the above.

[0023]

According to the present invention, in order to achieve the above-mentioned object, when a tray accommodating disks of different sizes is transported, the size of the tray on the disk receiving surface side of the tray and during transport is reduced. In a disc detection device for detecting the presence or absence and size of a disc by a single reflection type disc detection means having a light emitting portion and a light receiving portion arranged at positions capable of detecting the reflected light from both different disks, the tray may have a disc. The tray has position detecting means for detecting that the disk has reached the size detection position, and the tray has a notch hole for detecting the disk size at a position where light from the light emitting unit passes when the tray reaches the disk size detection position. Before the tray reaches the disk size detection position, based on the detection of reflected light by the reflection type disk detection means, And when the tray reaches the disk size detection position, the notch hole does not detect the reflected light by the reflection type disk detection means. Configuration. Further, when one of the tray accommodating the small-diameter disk with the small size and the tray accommodating the large-diameter disk with the large size is conveyed, the size of the tray on the disk accommodating surface side of the tray is different. In a disc detecting device for detecting presence / absence and size of a disc by a single reflection type disc detecting means having a light emitting portion and a light receiving portion arranged at positions capable of detecting the reflected light from both of the discs, the tray may have a disc size. A position detecting means for detecting that the disk has reached the detection position, wherein the tray in which the small-diameter disk is stored is outside the disk storage area and when the disk size detection position is reached, Has a notch for disc size detection at the position where
Before the tray reaches the disk size detection position, the presence or absence of a disk is detected based on the detection of reflected light by the reflection type disk detection means, and the notch is formed by the notch when the tray reaches the disk size detection position. When the reflected light is not detected by the reflective disk detecting means, it is configured to detect that the disk is small in size and small in diameter.

[0024]

In the disk detecting device according to the present invention, the light emitting portion and the light receiving portion of the reflection type disk detecting means are positioned on the disk receiving surface side of the tray and at a position where the reflected light can be detected from both of the disks of different sizes being transported. A notch hole for disc size detection is provided at a position where the light from the light emitting portion of the reflective disc detecting means is arranged and the tray reaches the disc size detection position, and the tray reaches the disc size detection position. The presence / absence of the disk is detected based on the detection of the reflected light by the previous reflective disk detecting means, and when the tray reaches the disk size detecting position, the reflected light of the reflective disk detecting means is not detected by the cutout hole. The presence of the disc and its size by detecting that the disc is small and small in size. It is possible to configure the order of the disk detecting device by a single reflection type disc detecting means.

Further, since a remarkable difference in detection level can be provided as compared with the amount of reflected light from the tray surface, a sufficient margin is provided in a range of a threshold value to be set for disc size discrimination.

[0026]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The embodiments of the present invention will be described below in detail with reference to the drawings. In the drawings described below, the same reference numerals are given to the same parts as those in FIGS. 3 and 4, and the overlapping description will be omitted.

FIGS. 7 to 9 show one embodiment of the disk detecting device of the present invention. As shown in these figures, the detection sensor P as a disk detection device is disposed near an extension line connecting the center of the disk in the magazine 100 and the center of the turntable 501. The location of the detection sensor P also corresponds to the position of the notch 101c that appears when the tray 101B for the disk D2 of 8 cm size reaches the turntable 501 side.

Further, the detection point B1 of the presence or absence of the disk and the detection point A1 of the disk size by the detection sensor P during the rotation of the trays 101A and 101B toward the turntable 501 are respectively at the positions shown in FIG. That is, the detection point B1 is the disk D1,
The detection point A1 is set to a position corresponding to the outer peripheral edge of the disk D1 which is off the disk D2.

Next, a method for detecting the presence / absence of a disk and the disk size by the above-described detection sensor P will be described. The detection of the disk described below is different from the conventional one in that the size of the disk is detected after the presence or absence of the disk is detected.

First, the tray 10 accommodating the disk D1
1A is sent out to the turntable 501 side, and FIG.
When the position shown in (a) is reached, the position is indirectly detected by the switch 634 as described above.

In this position, as shown in FIG.
By detecting the reflected light from the disk D1 by the detection sensor P, it is possible to detect that a 12-cm disk D1 is stored in the storage portion 101d of the tray 101A. Since this position also corresponds to the disk D2 of 8 cm size, the presence or absence of the disk D2 can be detected.

On the other hand, as shown in FIGS. 7 (c) and 7 (d),
When the detection sensor P takes in the reflected light from the storage section 101d of the tray 101A, the disk D1
It can be detected that it is not accommodated in the accommodation section 101d of 1A. Further, as described above, this position also corresponds to the accommodating portion 101e of the disk D2 having the size of 8 cm, so that when the reflected light from the accommodating portion 101e is obtained, the disk D2 is accommodated in the accommodating portion 101e. Can be detected.

When the detection of the presence or absence of the disk is completed, the tray 1
01A is further sent to the turntable 501 side.
When the tray 101A reaches the position shown in FIG. 8A, the position is indirectly detected by the switch 634 as described above.

At this position, as shown in FIG.
Since the reflected light from the disk D1 is obtained, it is possible to detect that the disk size is 12 cm.

As shown in FIGS. 8C and 8D,
Tray 10 containing 8 cm size disk D2
In the case of 1B, the tray 101B is
The notch 101c of the tray 101B is reached in a state where it reaches the first side.
Appears at a position corresponding to the detection sensor P. This allows
Since the reflected light to the detection sensor P is eliminated by the notch 101c and the output of the detection sensor P becomes maximum, it is possible to detect that the disk size is 8 cm.

As described above, in the present embodiment, the disk presence / absence detection point B1 is detected at a position overlapping the disks D1 and D2, and the disk presence / absence detection point A1 is located at a position overlapping the outer peripheral edge of the disk D1 and the notch hole 101c of the tray 101B. A sensor P was provided.

As a result, the presence or absence of the disk can be detected by the reflected light from the surfaces of the disks D1 and D2 or the reflected light from the storage sections 101d and 101e. a and c can be detected. The detection of the disc size is performed by detecting the presence or absence of light reflected from the tray surface or disc D.
Because it can be done by the presence or absence of reflected light from 1,
The detection point in the characteristic of FIG. 6 described above is a position that is higher than a, c, or c.

Therefore, even when the trays 101A and 101B vibrate during the size detection by the detection sensor P and the detection points a and c of the sensor output move, there is a sufficient margin between the detection points a and c. Since the threshold value can be set with a margin, the disc size can be reliably determined.

[0039]

As described above, according to the disk detecting apparatus of the present invention, the light-emitting portion and the light-receiving portion of the reflection type disk detecting means are arranged on the disk receiving surface side of the tray and for the disks of different sizes being transported. It is arranged at a position where the reflected light can be detected from both sides, and a notch hole for disc size detection is provided at a position where light from the light emitting part of the reflection type disc detection means passes when the tray reaches the disc size detection position. The presence or absence of a disc is detected based on the detection of reflected light by the reflection type disc detection means before the tray reaches the disc size detection position, and when the tray reaches the disc size detection position, the reflection type disc is detected by the notch hole. When the reflected light of the means is not detected, it is detected that the disk is small and small in diameter. The disk detecting device for detecting the presence or absence of the disk size can be constituted by a single reflective disc detecting means.

Further, since a remarkable difference in detection level can be provided as compared with the amount of light reflected from the tray surface, there is a sufficient margin in the range of the threshold value to be set for disc size discrimination. Detection can be prevented.

[Brief description of the drawings]

FIG. 1 is a perspective view showing the internal configuration of a conventional CD player.

FIG. 2 is a perspective view showing the magazine loading mechanism of FIG. 1;

FIG. 3 is a diagram for explaining a method of detecting a disk size by the detection sensor of FIG. 1;

FIG. 4 is a diagram for explaining a method of detecting the presence or absence of a disk by the detection sensor of FIG. 1;

FIG. 5 is a diagram conceptually showing a detection position by a detection sensor of FIG. 1;

FIG. 6 is a diagram showing output characteristics of the detection sensor of FIG.

FIG. 7 is a diagram illustrating a method of detecting the presence or absence of a disk using a detection sensor according to an embodiment of the disk detection device of the present invention;

FIG. 8 is a diagram for explaining a method of detecting a disk size by the detection sensor of FIG. 7;

FIG. 9 is a diagram conceptually showing a detection position by a detection sensor of FIG. 7;

[Explanation of symbols]

 101A, 101B Tray 101a, 101b Clamping hole 101c Cutout hole 101d, 101e Housing 501 Turntable P detection sensor

 ────────────────────────────────────────────────── ─── Continuing on the front page (72) Inventor: Atsushi Togashi 25-1, Nishimachi, Yamada, Kawagoe-shi, Saitama Pref. JP-A-1-176365 (JP, A) JP-A-1-66652 (JP, U) JP-A-61-45767 (JP, U)

Claims (2)

(57) [Scope of request for utility model registration] When a tray accommodating disks having different sizes is transported, the tray is arranged on a disk storage surface side of the tray and at a position where reflected light can be detected from both of the disks having different sizes being transported. In a disk detection device that detects the presence or absence and size of a disk by a single reflective disk detection unit having a light emitting unit and a light receiving unit, the disk detection device includes a position detection unit that detects that the tray has reached a disk size detection position, The tray has a notch for disc size detection at a position where light from the light emitting unit passes when the tray reaches the disc size detection position, and the reflection type before the tray reaches the disc size detection position. The presence or absence of the disk is detected based on the detection of the reflected light by the disk detection means, and the tray is moved to the disk size detection position. A disk detecting device which detects that the disk is a small-diameter disk if the reflected light is not detected by the reflective disk detecting means by the notch hole when the disk arrives. 2. When one of a tray accommodating a small-diameter disk with a small size and a tray accommodating a large-diameter disk with a large size is conveyed, the tray on the disk accommodating surface side of the tray and being conveyed. In a disc detection device for detecting the presence and size of a disc by a single reflection type disc detection means having a light-emitting portion and a light-receiving portion arranged at positions capable of detecting reflected light from both disks having different sizes, the tray Has a position detecting means for detecting that the disk has reached the disk size detection position, and the tray in which the small-diameter disk is stored is outside the disk storage area and when the disk size detection position is reached, the light emitting unit Has a notch for disc size detection at the position where light from the disc passes, and the tray reaches the disc size detection position The presence or absence of a disc is detected based on the detection of the reflected light by the reflective disc detecting means before performing, and when the tray reaches the disc size detecting position, the notched hole detects the presence of the reflected light by the reflective disc detecting means. A disk detecting device for detecting that the disk is a small-diameter disk if the detection is not performed.