JP3225784B2 - Disk device and disk detection device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a disk device for reproducing a disk-shaped recording medium and a disk detecting device for detecting a disk.

[0002]

2. Description of the Related Art Generally used disk devices include a CD (compact disk) player and an MD (mini disk) player. Among them,
In particular, in the case of an in-vehicle CD player, the loading / unloading is performed by inserting the disk through a slit-shaped opening formed in the front panel surface of the device housing and then moving the disk toward the disk surface.
Eject method is used.

[0003] However, in the method of inserting a disk through the slit-shaped opening, the user is forced to pull out the disk because the disk is out of the slit-shaped opening during loading or ejecting. Or push it in. For this reason, detection of the presence of the disk (especially, detection of the disk when the user can touch the disk) must be performed constantly and accurately.

[0004] Also, current disk devices require that disks of different sizes be played. For example, in a CD player, it is necessary to be able to play a disc having a diameter of 8 cm (hereinafter, referred to as an 8 cm disc) and a disc having a diameter of 12 cm (hereinafter, a 12 cm disc). For this reason, the size of the slit-shaped opening is made according to the size of the 12 cm disc, and the 8 cm disc is made so that the disc can be loaded no matter where it is inserted into the opening. When inserted into the opening, it may be inserted not at the center of the slit-shaped opening but at the end,
In such a case, it is necessary to accurately detect the disk.

[0005] In the conventional CD player of the above type, two typical types of disc detection methods required for judging the start and stop of the loading / ejection operation will be described below.

FIG. 7 is a top view showing a disk position detecting section of a first conventional example of a CD player using a system for detecting the presence and position of a disk by optical means.
FIG. 3 is a side view showing a disc position detecting unit of the CD player. In these figures, reference numeral 1 denotes a mechanism section of the CD player (a section for moving an inserted disc to a reproduction position, storing the disc, and performing a reproduction operation), and 1a denotes a housing of the mechanism section 1. 2 is a compact disk (hereinafter abbreviated as a disk), 2a is an 8 cm disk as shown by a solid line in FIG. 7, and 2b is a 12 cm disk as shown by a broken line in FIG.

Reference numeral 3 denotes a cylindrical transport roller to which a rotating force is applied by a motor (not shown). The transport roller 3 rotates together with a guide portion 4 (described later) so as to sandwich the disk, thereby moving the disk 2 toward the inside of the apparatus. And outward (in the horizontal direction in FIG. 8). Reference numeral 4 denotes a guide section formed on the housing 1a of the mechanism section 1. 5 is an LED (Light Emitting Diod) used as a light source.
e) Here, two LEs of LED5a and LED5b are used.
D is provided. Reference numeral 6 denotes a photosensor that performs light-to-electricity conversion. Here, the photosensor 6a and the photosensor 6b are used.
Are provided.

Reference numeral 7 denotes a prism, which is used to guide a light beam emitted from the LED 5 in a desired direction. Here, two prisms, a prism 7a and a prism 7b, are provided. Reference numeral 8 denotes an aperture (detection hole) provided in the housing 1 so that a light beam emitted from the LED 5 can pass therethrough.
Here, four apertures 8a, 8b, 8c, and 8d are provided. Reference numeral 9 denotes a disc insertion port, which is provided in a slit shape on a front portion of the mechanism section 1. Reference numeral 10 denotes a main substrate, which includes an LED 5, a photo sensor 6,
And other circuit elements used in a CD player are mounted and placed below the mechanism section 1.

The above-described mechanism section 1 is further housed in a case together with an operation section such as a push button and a power supply section, and is assembled as a general CD player.

FIG. 18 is an explanatory diagram showing an optical system including an LED, a photo sensor, and a prism. This figure 1
At 8, the light emitted from the LED 5a travels as shown by the arrow D in FIG. 18, passes through the aperture 8b, and enters the prism 7a. Then, the slope 7a of the prism 7a
At a, the optical axis of the light beam is bent by 90 ° and heads toward the other end of the prism 7a. The luminous flux is applied to the slope 7 of the prism 7a.
The optical axis is further bent by 90 ° by ab and enters the photosensor 6a through the aperture 8a. FIG. 18
2 are provided in the mechanism section 1 shown in FIG.

The operation will now be described. In the optical system shown in FIG. 18, the two apertures 8a and 8b
If the disk 2 exists so as to block the optical path in any of the cases, the amount of light incident on the photosensor 6a decreases, and if the disk 2 does not exist, the maximum amount of light enters the photosensor 6a. That is, the presence or absence of the disc can be detected by extracting the magnitude of the light amount in the photosensor 6a by a detection circuit described later with reference to FIG. Thus, the optical system as shown in FIG. 18 functions as an optical disk detection system or an optical disk detection unit.

FIG. 9 is a circuit diagram showing a detecting circuit of the optical disk detecting means shown in FIGS. In FIG. 9, reference numeral 50 denotes a power supply, for example, a 5V DC power supply. Reference numeral 51 denotes a resistor, which is used to set a current value flowing through the LEDs 5a and 5b. 52a, 52
b is a photo sensor load resistance, which has a function of converting the photocurrent of each of the photo sensors 6a and 6b into a voltage,
53 is an AND circuit, and 54 is an output terminal for outputting a disk detection signal.

[0013] As shown in FIG.
When there is no disc 2 in the disc insertion slot 9, the photocurrent of the photosensors 6a and 6b becomes maximum, and both output voltages of the photosensor load resistors 52a and 52b in FIG. The disk detection signal at the output terminal 54, which is the output of the circuit 53, goes high.
At this time, if a disk is inserted into the mechanism unit 1 and any of the optical paths of the apertures 8a to 8d is interrupted, the photocurrent of the photo sensor 6a or 6b decreases, and FIG.
The output voltage of either the photo sensor load resistor 52a or 52b becomes Low. As a result, the output terminal 54
Is low. The rotation of the transport roller 3 is started with the change to Low as a trigger.
The disk is drawn into the housing by the start of rotation of the transport roller 3, and the loading of the disk is started.

On the other hand, when a command to eject the disc (eject) is input to the apparatus, the transport roller 3 rotates in the opposite direction to the above, and moves the disc toward the outside of the housing. The movement of the disk is stopped at the position of the disk 2 in FIG. 11 using an ejection stop sensor provided at the position indicated by Y.

At the disk position shown in FIG. 11, the transport roller 3 sandwiches the disk together with the guide portion 4. If there is a reproduction start operation on an operation panel or the like (not shown), the transport roller 3 is rotated to rotate again. The disc can be pulled in. That is, if there is a reproduction start command in a state where the disk detection signal of the output terminal 54 in FIG. 9 is confirmed to be low, the loading is performed again. Further, in the state shown in FIG. 11, the user can manually pull out the disc, and when the user pulls out the disc, the ejection of the disc is completed.

In order to correctly execute the above-described loading and ejecting operations, it is necessary to accurately determine that the disk exists correctly. In particular, as described later, the disc 2 has a transparent portion that allows light to pass therethrough and an opaque portion that does not allow light to pass therethrough. Therefore, even if the opaque portion obstructs the aperture, the light cannot be intercepted and the disc is detected. There was something I could not do. For this purpose, in the mechanism section 1 shown in FIG. 7, it is necessary to provide two sets of optical disc detecting means as shown in FIG. This will be further described below.

First, the structure of the disk will be described.
FIG. 10 is an explanatory view showing the structure of an 8 cm disk. In FIG. 10, the diameter of the 8 cm disc 2a is 80 m.
m at the center and a diameter of 15
mm holes are provided.

Here, the center hole area is perforated so that a light beam for disc detection passes therethrough, but there are areas other than the center hole area that allow light to pass therethrough. On the compact disk, aluminum is deposited on a transparent plastic material surface to form a reflective recording surface, or a label is printed for title display. However, this is not performed on the entire surface of the disk. This is regarded as the shaded area (opaque area). That is, there is a region where the transparent plastic is exposed at the edge near the outer periphery or around the center hole. Even if a light beam for detecting the presence of a disc is applied to this area, the light passes through the area, and the same detection result as when no disc is present is obtained. Therefore, in order to detect a disk by an optical system, it is necessary to reliably irradiate light to an opaque portion.

In FIG. 11, an opaque portion is shown by hatching on the 8 cm disk 2a, which shows an opaque portion like the hatched portion in FIG. When the 8 cm disk 2a exists in the positional relationship as shown in FIG. 11, the apertures 8a and 8d are blocked by the opaque portions of the 8cm disk 2a, and it can be confirmed that the disk exists. Here, if the disk detection is performed only at the apertures 8b and 8c, the apertures 8b and 8c are both located in the transparent portion of the disk 2 and are in a state where light can pass through. Can not. For this purpose, the apertures 8a and 8b and the aperture 8
c and 8d need to be provided. Here, the number of LEDs and photosensors is reduced and simplified by using only one long prism that optically couples the apertures.

Further, in the case of the 8 cm disc 2a, the position where the disc can be inserted in the disc insertion slot 9 is 12c.
Since it is larger than the case of the m disk, the position in the left and right direction in the disk insertion slot 9 cannot be determined.

FIG. 12 shows the 8 cm disc 2a and the apertures 8a, 8b, 8c, and 8cm when the 8cm disc 2a is largely shifted to the right in the left-right direction as viewed from the disc insertion slot 9.
It is explanatory drawing which shows the positional relationship with 8d. In the case of FIG. 12, unlike the case of FIG. 11, the apertures 8a, 8a
c, and 8d, with light passing through, aperture 8b
Only the light is blocked. For this reason, the aperture 8b which was unnecessary in the case shown in FIG. 11 is required for the presence detection of the 8 cm disk 2a in the state of FIG. Also,
Similarly, when the 8 cm disc 2a is shifted to the opposite side in the left-right direction from FIG.
Only c blocks light.

As described above, it is necessary to correctly detect the presence of the 8 cm disc 2a at the disc insertion slot 9 regardless of the position in the left-right direction. Therefore, the four detection positions of the apertures 8a to 8d are required. Is required. For these reasons, apertures are provided at four locations, and two sets of optical disc detection means as shown in FIG. 18 are provided.

As described above, in order to correctly detect the presence of a disk using the optical disk detecting means, at least LE
D2, the photosensor 6, and the prism 7 are required two each, and there is a disadvantage that the cost is high as a whole because the optical semiconductor component is expensive.

Next, a description will be given of a second conventional disk drive which uses mechanical means without using optical means. FIG. 13 is a top view of a mechanism section of a CD player as a second conventional example, and FIG. 14 is a side view. In these figures, 11a and 11b are levers, and a pair is provided on the left and right, and 12a and 12b are levers 11 respectively.
Reference numerals 13a and 13b denote springs for rotating the levers 11a and 11b toward the center of the mechanism unit 1, respectively. 14a and 14b are detection pins which are fixed to the levers 11a and 11b, respectively, have a pin shape, and can be displaced along the outer peripheral end surface of the disk 2 by the urging force of the springs 13a and 13b.

The lever 11 shown by a solid line in FIG.
The positions of a and 11b are in a state where the lever is at the movable limit in the inward direction (that is, a state where the disc is not inserted).
On the other hand, the lever 11 shown by a broken line in FIG.
Positions a and 11b show a state where the lever is spread most (that is, a state where a 12 cm disk is inserted).

Reference numerals 15a and 15b denote detection switches for detecting that the levers 11a and 11b are at the movable limit points toward the center of the mechanism, respectively. 11a,
11b, the switch is turned on. Reference numeral 16 denotes a switch board on which wiring and fixing from the detection switches 15a and 15b are performed. 10B is a main substrate similar to the main substrate 10 shown in FIG.
The difference is that the LED 5 and the photo sensor 6 are not mounted. Reference numeral 17 denotes a distribution cable for transmitting signals from the detection switches 15a and 15b collected on the switch board 16 to the main board 10B.

FIG. 15 is a circuit diagram showing a circuit for generating a disk detection signal in the CD player as shown in FIG. In FIG. 15, reference numerals 55a and 55b denote pull-down resistors, which are arranged to be pull-down resistors for the detection switches 15a and 15b, respectively. The disk detection signal at the output terminal 54 is obtained by processing the state of the detection switch 15 by the AND circuit 53 as in the case of FIG. Therefore, in the CD player having the configuration shown in FIG. 13, disc detection is performed as follows. First, when the disk 2 is not present in the disk insertion hole 9 of the mechanism section 1, the detection switches 15a and 15b are both ON, both inputs of the AND circuit 53 are at the high level, and the disk detection signal at the output terminal 54 is at the high level. Level.

Next, when the disk 2 is inserted through the insertion slot 9, the end face of the disk 2 is connected to the lever 11a or 11b through the detection pin 14a or 14b.
Push out. As a result, one or both of the detection switches 15a and 15b change to OFF,
As is clear from the circuit configuration of FIG. 15, the disk detection signal at the output terminal 54 becomes Low. The change of the disk detection signal to Low triggers the rotation of a motor (not shown), and the rotation of the transport roller 3 moves the disk 2 to the inside of the housing, thereby completing the loading.

FIG. 16 is a top view showing the disc device when the disc 2 (the 8 cm disc 2a is shown by a solid line and the 12 cm disc is shown by a broken line) is in an inserted state. This figure shows a case where the disk 2 is at the center of the disk insertion slot 9 in the left-right direction. In this state, the detection switches 15a and 15b are both OFF, and in this case, the disk detection signal of the output terminal 54 is This signal is Low, and the presence of the disk 2 can be detected from this signal.

Here, in FIG. 16, considering the case where the disk 2 is displaced in the left-right direction as viewed from the disk insertion port 9 side, either of the levers 11a or 11b is pushed wider than the case shown in FIG. Therefore, it does not matter whether one of the detection switches 15a and 15b is OFF, so that the disk detection signal becomes low as in the case where the disk is at the center.

As described above, the existence of the disk using the lever
The position detection method has a feature that the disk can be reliably detected even if the insertion position of the disk is shifted left and right, but has the following problems. The first of the tasks is
As shown in (1), the detection switches 15a and 15b need to be provided on the upper surface of the mechanism unit 1,
A long wiring is required between the main substrate 10B placed below the main substrate 10B. The second problem is that when the disc is inserted, the lever 11 urged by the spring 13 is pushed and spread, so that an extra insertion force is required for the operator, and the operational feeling is deteriorated. Similarly, it is necessary to secure an extra disk carrying force of the carrying roller 3 by the resistance of the lever 11. The urging force of the spring 13 must be at least a force enough to press the detection switch 15 via the lever 11 and maintain the switch ON state, and the urging force of the spring 13 cannot be reduced.

For the above-mentioned reasons, regarding the problem 1, the presence of the switch board 16 and the presence of the distribution cable 17 complicate the device, causing an increase in the number of assembling steps and costs. Regarding the problem 2, when the transport roller 3 is pressed against the disk 2 more strongly in order to increase the disk transport force by an amount corresponding to the load received from the lever 11, when the operator pulls out the disk 2 in the ejected state, However, there is a problem that the resistance of the device increases and the operational feeling further deteriorates.

As a countermeasure for the above problem 2, the lever 11
A method of widening the movable limit in the inward direction can be considered.
FIG. 17 is a top view showing a third conventional disk device using this method. 13 shows a state in which the lever 11 is at the inner movable limit. The width between the levers 11 is wider than that in the case of FIG. 13 and is almost the same as the diameter of the disk 2. In such a design, FIG.
As is clear from the relationship between the disk 2 and the lever 11 shown in FIG. 7, the force (resistance force) for pushing and expanding the lever 11 when inserting and ejecting the disk can be made smaller than in the case of FIG. Therefore, the insertion force of the user and the rotation force of the transport roller can be reduced.

However, the configuration shown in FIG. 17 has a new problem. In the case of FIG.
If you try to detect that a new
Since the interval of 1 is almost the same size as the diameter of the disk 2, it cannot be detected unless the disk 2 is pushed almost halfway through the disk insertion slot 9. For this reason, the leading end of the disk 2 is inserted to the far end in a state where the detection switch 15 is turned off, and the distance between the transport roller 3 and the disk insertion port 9 is increased, so that the detection switch 15 It is necessary to prevent the leading end of the disk 2 from hitting the transport roller 3 before turning off.

However, the current CD player is 12 cm
It is necessary to reproduce both the disc and the 8 cm disc. For this reason, the distance between the transport roller 3 and the disc insertion slot 9 has been determined to some extent so that the disc can function with any size disc. .

For this reason, the structure is such that the leading end of the disk 2 hits the transport roller 3 before the detection switch 15 is turned off, so that the operator can transport the disk 2 before the disk 2 is pulled in by the rotation of the transport roller 3. The user feels the resistance of the disc 2 to the roller 3 colliding, and in this sense, the operational feeling may be significantly reduced. In particular, when the operator pushes the disc 2 into the insertion slot 9 at a high speed, the collision is likely to occur, and The operational feeling was reduced.

[0037]

As described above, the conventional method using the optical disk detecting means has a problem that many expensive optical semiconductor elements are required.
On the other hand, with the conventional disk detection method of detecting the outer edge of the disk using a lever and a push-type switch, there is a problem that a switch substrate and wiring are required, and further, to reduce the mechanical load caused by the lever, There was a problem that it was incompatible to keep the insertion feeling of the operator better.

The present invention has been made to solve such a problem, and can be simply configured by using inexpensive components, and can improve the feel when an operator inserts the device. It is an object of the present invention to obtain a disk device or a disk detection device capable of performing the above.

[0039]

An optical system having a slit-shaped opening provided in a housing and an optical path blocked by a disk inserted or ejected through the opening is provided. , A lever that is displaced by contacting the disk and interrupts the optical path, a disk detection circuit that outputs a disk detection signal when the optical path of the optical system is interrupted, and a disk movement that moves the disk by a signal from the disk detection circuit Means.

Further, a slit-shaped opening provided in the housing, an optical system having an optical path interrupted by a disk inserted or ejected through the opening, and an optical path which is displaced by contacting the disk to interrupt the optical path. A lever and a disk detection circuit that outputs a disk detection signal when the optical path of the optical system is interrupted are provided. When a disk is inserted near the end of the opening, the lever interrupts the optical path, When a disk is inserted near the center, the disk blocks the optical path.

A lever which has a slit-shaped opening provided in the housing, a contact portion which comes into contact with a disc inserted or ejected through the opening, and which is rotated by being pressed by the disc, An optical system having an optical path that is interrupted by a light-shielding portion provided on the lever when the lever rotates, a disk detection circuit that detects that the optical path of the optical system is interrupted, and a signal from the disk detection circuit. And a disk moving means for moving the disk, wherein the contact portion has a longer distance from the light-shielding portion to the rotation axis of the lever.

A disc device for inserting or ejecting discs as recording media having different diameters, wherein the disc-shaped recording medium is conveyed into and out of the device through a slit-shaped opening provided in a part of a housing. A disk transport mechanism, and a reflecting means provided on a second side opposite to the first side with respect to the disk surface, for emitting light emitted from a light emitting element located on a first side with respect to the disk surface. Back to the first side with
An optical disk detecting means for detecting the presence of a disk by having an optical path received by a light receiving element provided on the first side, and blocking the optical path by a disk, and a lever movable along the outer end surface of the disk. A lever for blocking the optical path of the optical disk detecting means according to the position of the disk.

The disk detecting apparatus according to the present invention has an optical system having an optical path interrupted by a disk, a lever which is displaced by contacting the disk and interrupts the optical path, and an optical system which detects when the optical path of the optical system is interrupted. Is provided with a disk detection circuit for outputting a disk detection signal.

[0044]

An optical system having a slit-shaped opening provided in a housing, an optical path interrupted by a disk inserted or ejected through the opening, and a disk device in contact with the disk. A lever that displaces the optical path to block the optical path, a disk detection circuit that outputs a disk detection signal when the optical path of the optical system is interrupted, and disk moving means that moves the disk based on a signal from the disk detection circuit. Therefore, since the displacement of the lever and the disc is detected by the optical system, the disc can be reliably detected and the displacement of the lever is not burdened.

Further, a slit-shaped opening provided in the housing, an optical system having an optical path interrupted by a disk inserted or ejected through the opening, and an optical path which is displaced by contacting the disk to interrupt the optical path. A lever and a disk detection circuit that outputs a disk detection signal when the optical path of the optical system is interrupted are provided. When a disk is inserted near the end of the opening, the lever interrupts the optical path, Since the disk blocks the optical path when the disk is inserted near the center, the disk can be quickly and reliably detected when the disk is inserted into the opening.

Further, a lever having a slit-shaped opening provided in the housing, a contact portion which comes into contact with a disc inserted or ejected through the opening, and which is pressed by the disc and rotated, An optical system having an optical path that is interrupted by a light-shielding portion provided on the lever when the lever rotates, a disk detection circuit that detects that the optical path of the optical system is interrupted, and a signal from the disk detection circuit. A disk moving means for moving the disk is provided, and the contact portion has a longer distance to the rotation axis of the lever than the light shielding portion, so that the force for rotating the lever can be reduced and the light shielding portion is shielded from light. The disk can be quickly detected by reducing the displacement of the lever.

A disc device for inserting or ejecting discs as recording media having different diameters, wherein the disc-shaped recording medium is conveyed into and out of the device through a slit-shaped opening provided in a part of a housing. A disk transport mechanism, and a reflecting means provided on a second side opposite to the first side with respect to the disk surface, for emitting light emitted from a light emitting element located on a first side with respect to the disk surface. Back to the first side with
An optical disk detecting means for detecting the presence of a disk by having an optical path received by a light receiving element provided on the first side, and blocking the optical path by a disk, and a lever movable along the outer end surface of the disk. The optical path of the optical disk detection means is provided in accordance with the position of the disk, so that the optical path is blocked by the disk or a lever movable along the outer end surface of the disk. Since the disk is detected, the disk can be reliably detected.

The disk detecting device according to the present invention has an optical system having an optical path interrupted by a disk, a lever which is displaced by contacting the disk and interrupts the optical path, and an optical system which detects when the optical path of the optical system is interrupted. Is provided with a disk detection circuit that outputs a disk detection signal, so that the optical path of the optical system is blocked by the disk or the lever, so that the disk can be reliably detected.

[0049]

【Example】

Embodiment 1 FIG. FIG. 1 is a top view showing a mechanism portion of a vehicle-mounted CD player according to an embodiment of the present invention, and FIG. 2 is a side view. Since the shape of the disk 2 is the same as that of the conventional example, the same reference numerals are given and the description is omitted. In these figures, reference numeral 100 denotes a mechanism section of the CD player (a section for moving an inserted disc to a playback position, storing the disc, and performing a playback operation), and 100a denotes a mechanism section 10 for the CD player.
0 case. Reference numeral 103 denotes a cylindrical transport roller to which a rotational force is applied by a motor (not shown). The transport roller 103 rotates together with a guide portion 104 (described later) so as to pinch the disk, thereby rotating the disk 2.
Are moved inward and outward (left and right directions in FIG. 1). Reference numeral 104 denotes a guide portion formed on the housing 100a of the mechanism unit 100. Reference numeral 105 denotes an LED (Light Emitting Diode) used as a light source. Reference numeral 106 denotes a photo sensor that performs optical-electrical conversion.

A prism 107 is used to guide the light beam emitted from the LED 105 in a desired direction. Reference numeral 108 denotes an aperture (detection hole) provided in the housing 100a so that a light beam emitted from the LED 5 can pass therethrough. In this case, two apertures 108a and 108b are provided. Reference numeral 109 denotes a disk insertion port, which is provided in a slit shape on a front portion of the mechanism section 100. 110 is a main substrate, and LED 105,
The photo sensor 106 and other circuit elements used in the CD player are mounted and placed below the mechanism section 100.

Reference numerals 101a and 101b denote substantially fan-shaped plate-like levers, which are provided with light shielding portions 121a and 121b for blocking light passing through the apertures 108a and 108b. Reference numerals 102a and 102b are rotation fulcrums of the levers 101a and 101b. The levers 101a and 101b rotate as indicated by arrows A and B around the rotation fulcrums 102a and 102b. Further, bar-shaped detection pins 114a and 114b are protruded from the levers 101a and 101b so as to interlock with each other. When the disc 2 is inserted into the disc insertion slot 109 by the user, the detection pins 114a,
14b comes into contact with the disk 2 and is displaced. Then, the levers 101a, 101a, 1b are linked with the detection pins 114a, 114b.
01b rotates. In addition, the rotation fulcrums 102a, 102b
And the length between the detection pins 114a and 114b is longer than the length between the rotation fulcrums 102a and 102b and the light shielding portions 121a and 121b.
Since b is easy to rotate even with a small force, the force for pressing the disc 2 when the user inserts the disc 2 may be small, so that the operability of the user is improved. Also,
By providing the light shielding portions 121a and 121b inside the housing 100a, the size of the device can be reduced.

Reference numeral 113 denotes a spring, both ends of which are connected to the levers 101a and 101b.
01b function to bias each other inward. Further, since the light passing through the apertures 108a and 108b can be blocked by the disk 2 or the light shielding portions 121a and 121b of the levers 101a and 101b, the levers 101a and 101b are located below the prism 107 as is clear from FIG. Located in. In addition, LED
Light emitted from 105 is transmitted to levers 101a and 101b.
Alternatively, if not blocked by the disk 2, as shown by the arrow C in FIGS. 2 and 6, the light passes through the aperture 108a upward in FIG.
8b is incident on the photosensor 106 after passing downward in FIG.

In the optical system shown in FIG. 6, if the disk 2 exists so as to block the optical path at one of the two apertures 108a and 108b, the amount of light incident on the photosensor 106 decreases, and If not, the maximum amount of light is incident on the photo sensor 106. That is, the magnitude of the light amount in the photosensor 106 is taken out by a detection circuit as shown in FIG.
Can be detected.

The aperture 108a is connected to the housing 100a.
Are formed by holes 108aa, 108ab, and 108ac provided in the housing 100a, and the aperture 108b is formed by holes 108ba, 108bb, and 108bc provided in the housing 100a. The levers 101a and 101b block light between the hole 108aa and the hole 108ab, or between the hole 108ba and the hole 108bb.
Between the hole 108ab and the hole 108ac, or
The disk 2 blocks light between bb and the hole 108bc.

FIG. 3 is a circuit diagram showing a circuit for generating a disk detection signal. In this figure, reference numeral 56 denotes a resistor, which sets a current flowing through the LED 105 together with the power supply 50, and 57, a photosensor load resistor which converts the photocurrent of the photosensor 106 into a voltage. The voltage at the photosensor load resistor 57 becomes a disk detection signal at the output terminal 54. If this disk detection signal is High or Low
It can be determined whether or not the disk 2 has been detected based on the change of the signal (voltage). In this case, when the disk detection signal is High, the disk 2 does not exist.
In the case of, it is determined that the disk 2 exists.

Next, the operation of disk detection will be described. The position of the levers 101a and 101b in FIG. 1 is at the inward movable limit position where the levers 101a and 101b are stopped by the stopper (not shown).
FIG. 1 shows a case where the 8-cm disc 2a is inserted into the disc insertion slot 9 and is at the first position where it is detected. In this state, the opaque portions (shaded portions in FIG. 1) of the disc 2 are the apertures 108a and 108.
b is almost covered. Therefore, the photocurrent of the photosensor 106 decreases, and the disk detection signal at the output terminal 54 in FIG. 3 becomes low. Thus, in this case, the presence of the disk is detected by the disk 2a by the aperture 108.
a or 108b.

Also, as shown in FIG.
a and 101b are in an open state larger than the diameter of the 8 cm disk 2a, and the disk 2 is opened by levers 101a and 101b.
b is not mentioned. Therefore, if the disc 2 is inserted from a position near the center of the insertion opening 9 in the left-right direction, the operator can insert the 8-cm disc 2a without feeling the mechanical resistance of the lever 101. On the other hand, even if the disc 2b is inserted with the disc 2b slightly shifted to the left or right when the disc is inserted, the disc 2b is opened more than the diameter of the 8cm disc 2a as shown in FIG. The amount of movement for moving 101b is small, and the insertion resistance can be made considerably small.

FIG. 1 shows a state where the presence of the disk 2 can be detected for the first time when the disk 2 is inserted from the disk insertion slot 109. In this state, as shown in FIG. The problem that the disc comes into contact with the transport roller before the transport roller 103 starts rotating as a detrimental effect when the lever interval is large in front of the transport roller 103 is that the disk 2 itself has an aperture 1
The problem is solved by blocking 08a and 108b.

Next, how the disc detection changes according to the position of the disc 2 in the disc insertion slot 109 will be described. In particular, the disk 2 is
When a command for ejecting a disc (eject) is input to the apparatus in a state where
3 rotates in the opposite direction to the above-described direction, moves the disk 2 toward the outside of the housing 100a, and uses an ejection stop sensor provided at a position indicated by X and Y in FIG. In the case where the movement of the disk is stopped at the position of the disk 2 in FIG. 4, it is possible for the user to directly pull out the disk 2 by hand and replace the disk 2, or to depress the playback switch. Detecting the disk 2 is important because the disk 2 can be transported and played from the state.

FIG. 4 is a top view of the disk device when the 8 cm disk is located at the center in the left and right direction, and FIG. 5 is a top view of the disk device when the 8 cm disk is shifted to one side of the disk insertion slot 9. In these figures, in the state of FIG. 4, the levers 101a and 101b are almost in contact with the outer shape of the disk 2 almost at the inner movable limit position. On the other hand, the apertures 108a, 108b
Is applied to the opaque portion (hatched area in the figure) of the disk 2 and the light is blocked, and the disk detection signal is low. That is, the presence of the disk 2 in the state shown in FIG.
This is possible by blocking b.

When the disc 2 is slightly moved from the disc position in FIG. 4 to the left or right as viewed from the disc insertion slot 9, the result is as shown in FIG. 5, so that either the lever 101a or the lever 101b is pushed outward. Become
As is clear from the shapes of the levers 101a and 101b,
The lever blocks the aperture 108. FIG. 5 shows a case where the disc is moved to the right as far as possible from the disc insertion slot 9. The opaque portion of the disk itself (the hatched portion in FIG. 5) is not at a position that blocks both the apertures 108a and 108b, but the lever 101b blocks the aperture 108b, so that the presence of the disk can be detected.

As described above, the 8 cm disc 2a
Is located near the center in the left and right direction, the opaque portion of the disc itself blocks the aperture 108, and when it deviates from the center in the left and right direction, the lever 101 that has been pushed open blocks the aperture 108. When the disc size is 12 cm, the lever 101 must be pushed open when the disc is inserted or ejected. However, the interval when the lever 101 is at the inner movable limit position is large, and the conventional example shown in FIG. Since the urging force for pressing the detection switch 15 is not required, the mechanical load by the lever 101 is smaller than in the conventional case.

This embodiment can also be used to detect the presence or position of another disk. For example, it is possible to detect that a disk has been transported from the inside of the mechanism section 1 to the outside and has come to the eject position. The same can be applied to the case of performing the above.

In this embodiment, the disk 2
Even if the power is turned off while the disk is out of the disk insertion slot 9 (a state where the user can touch and pull out the disk 2), it is reliably detected whether the disk 2 is present after the power is turned on again. So you can use disk 2
The transport roller 103 rotates and the disc 2
However, the malfunction such as the rotation of the transport roller 103 does not occur.

In this embodiment, even when the user forcibly pulls out the disk 2 during loading of the disk 2, it is possible to reliably detect that the disk 2 is not present and stop the transport roller 103. So you can
Useless operation of the transport roller 103 is eliminated.

In this embodiment, the lever is not touched when the 8 cm disc is inserted from the center of the disc insertion slot 109 in the left-right direction. However, the disc may be touched. In this embodiment, the lever 101
Although a and 101b are substantially fan-shaped, other shapes such as a T-shape or an L-shape may be used as long as a contact portion and a light-shielding portion are provided.

Also, in this embodiment, the presence / position detection of a disk required by a smaller number of sets of optical disk detection means can be performed for an 8 cm disk whose left and right positions are not determined. Expensive parts can be reduced and can be manufactured at low cost.

Further, in this embodiment, although there is a mechanical load relating to the movement of the disk, the load can be further reduced, and the feeling of inserting the disk by the operator can be kept good.

Further, this embodiment achieves an effect that the switch substrate and the wiring material which are required in the second conventional example and the third conventional example become unnecessary.

[0070]

The disk device according to the present invention can reliably detect a disk.

Further, the force required for inserting the disc can be reduced.

The disk detecting device according to the present invention can reliably detect a disk.

[Brief description of the drawings]

FIG. 1 is a top view showing a mechanism portion of a vehicle-mounted CD player according to an embodiment of the present invention.

FIG. 2 is a side view showing a mechanism portion of a vehicle-mounted CD player according to an embodiment of the present invention.

FIG. 3 is a circuit diagram showing a circuit for generating a disk detection signal according to one embodiment of the present invention.

FIG. 4 is a top view showing a mechanism portion of a vehicle-mounted CD player according to an embodiment of the present invention.

FIG. 5 is a top view showing a mechanism portion of the in-vehicle CD player according to one embodiment of the present invention.

FIG. 6 is an explanatory diagram illustrating an optical system including an LED, a photo sensor, and a prism according to an embodiment of the present invention.

FIG. 7 is a top view showing a disc position detecting portion of a first conventional example of a CD player.

FIG. 8 is a side view showing a disc position detection portion of a first conventional example of a CD player.

FIG. 9 is a circuit diagram showing a circuit for generating a disk detection signal of the first conventional example.

FIG. 10 is an explanatory diagram showing the structure of an 8 cm disk.

FIG. 11 is a top view showing a disc position detection portion of the first conventional CD player.

FIG. 12 is a top view showing a disc position detecting portion of a first conventional example of a CD player.

FIG. 13 is a top view showing a disc position detecting portion of a second conventional CD player.

FIG. 14 is a side view showing a disc position detecting portion of the CD player of the second conventional example.

FIG. 15 is a circuit diagram showing a circuit for generating a disk detection signal according to a second conventional example.

FIG. 16 is a top view showing a disc position detecting portion of the CD player of the second conventional example.

FIG. 17 is a top view showing a disc position detection portion of a second conventional CD player.

FIG. 18 is an explanatory diagram showing an optical system including a LED, a photosensor, and a prism according to a first conventional example.

[Explanation of symbols]

101: lever, 102: rotation fulcrum, 103: spring, 105: LED, 106: photo sensor, 107:
Prism, 108 ... aperture

──────────────────────────────────────────────────の Continued on the front page (51) Int.Cl. ⁷ Identification code FI G11B 19/10 501 G11B 19/10 501Q

Claims (5)

(57) [Claims] 1. An optical system having a slit-shaped opening provided in a housing, an optical path blocked by a disk inserted or ejected through the opening, and an optical path displaced by contacting the disk. A disk device comprising: a lever that blocks a disk; a disk detection circuit that outputs a disk detection signal when an optical path of the optical system is blocked; and a disk moving unit that moves the disk based on a signal from the disk detection circuit. 2. An optical system having a slit-shaped opening provided in a housing, an optical path blocked by a disk inserted or ejected through the opening, and an optical path displaced by contacting the disk. And a disk detection circuit that outputs a disk detection signal when the optical path of the optical system is blocked, and when the disk is inserted near the end of the opening, the lever is connected to the lever. A disk device, wherein the optical path is blocked, and the disk blocks the optical path when the disk is inserted near the center of the opening. A lever having a slit-shaped opening provided in the housing, and a contact portion contacting a disc inserted or ejected through the opening, the lever being pressed by the disc and rotating; An optical system having an optical path that is blocked by a light blocking portion provided on the lever when the lever rotates;
A disk detecting circuit for detecting that the optical path of the optical system is interrupted; and a disk moving means for moving the disk in accordance with a signal from the disk detecting circuit. A disk device characterized by having a long distance from a rotating shaft. 4. A disk device for inserting or ejecting disks as recording media having different diameters, wherein the disk-shaped recording medium is conveyed into and out of the device through a slit-shaped opening provided in a part of a housing. A disk transport mechanism,
The light emitted from the light emitting element located on the first side with respect to the surface of the disk is reflected by the reflecting means provided on a second side opposite to the first side with respect to the disk surface. First
And an optical path for receiving the light by the light receiving element provided on the first side, an optical disk detecting means for detecting the presence of the disk by blocking the optical path with the disk, and an outer end face of the disk. And a lever that moves along the optical disk detector, wherein the lever blocks an optical path of the optical disk detecting means according to the position of the disk. 5. An optical system having an optical path blocked by a disk, a lever abutting on the disk and displacing to block the optical path, and a disk detection signal when detecting that the optical path of the optical system is blocked. And a disk detection circuit for outputting a signal.