JPH06325461A - Disk reproducing device - Google Patents

Abstract

PURPOSE:To semipermanently detect a disk mounting state with high accuracy without being affected by the use environment of the device and the accuracy of mounting detecting parts. CONSTITUTION:A magnet 201 is adhered and fixed to the rear surface of a cartridge supporting frame 103 and a Hall element 202 is adhered and fixed onto the base surface of a loading cam plate 105. The distance between a magnet 201 and the Hall element 202 shrinks and the intensity of the magnetic field detected by the Hall element 202 increases successively according to loading (descending of the cartridge supporting frame 103) of a cartridge case 200. The loading of the cartridge case, i.e., disk mounting, is so judged as to be completed when the excess of the signal voltage of the Hall element 202 beyond some threshold value is detected.

Description

Detailed Description of the Invention

[0001]

The present invention relates to, for example, an audio disc, FDD, HDD, magneto-optical disc device, CD-RO.
The present invention relates to a disc reproducing device for reading information recorded on a reproduction-only disc such as an M device.

[0002]

2. Description of the Related Art A disk reproducing apparatus for optically reading information recorded on a disk by a pickup reads information in a non-contact manner with respect to the recording medium, so that the durability of the recording medium is dramatically improved. It has various advantages such as easy random access and high recording density. Therefore, recently, it has been widely used as a reproducing apparatus for various discs such as audio discs, video discs, and data discs for data files.

FIG. 7 is a perspective view showing a CD-ROM reproducing device which is one of conventional disk reproducing devices. In the figure, reference numeral 1 indicates the apparatus main body. An opening 1a for inserting and removing the cartridge case 2 in which the disk 2a is rotatably accommodated is provided on one end surface of the apparatus main body 1. A cartridge support frame 3 that supports the cartridge case 2 inserted through the opening 1a is provided in the apparatus body 1. Sliding protrusions 4 are provided on both side surfaces of the cartridge support frame 3, respectively. Further, on both sides of the cartridge support frame 3, a loading cam plate 5,
5 are arranged respectively. A guide groove 5a for guiding the sliding protrusion 4 is formed on the loading cam plates 5 and 5.
Are formed respectively.

The tips of the loading cam plates 5 and 5 are connected by a connecting rod 6. The tips of arms 7, 7 are engaged with the connecting rod 6, and the arms 7,
The other end of 7 is fixed to the loading operation transmission shaft 8. Further, a transmission lever 9 is provided on the loading operation transmission shaft 8 so as to project therefrom. The tip of the transmission lever 9 is in contact with the tip of an operation lever 11 fixed to one end of the loading operation shaft 10, and the rotation of the loading operation shaft 10 by the loading operation knob 12 is transmitted to the arms 7, 7 by the transmission lever 9. To be done. The loading operation knob 12 is arranged near the opening 1a of the apparatus body 1.

Also, in the figure, 13 indicates a turntable. The turntable 13 rotationally drives the disk 2a in the cartridge case 2 supported by the cartridge support frame 3. Further, 14 is a head for recording and reproducing the disk 2a. The head 14 is capable of reciprocating in the radial direction of the disk 2a by driving a linear motor 15.

Next, the operation of mounting a disc on the disc reproducing apparatus will be described.

First, the cartridge case 3 is inserted from the opening 1a of the apparatus main body 1 and supported by the cartridge support frame 3. Next, the loading knob 12 is turned in the direction of arrow A. This causes the loading operation shaft 10 to rotate,
The operating lever 11 pushes up the transmission lever 9, and the arm 7,
7 presses the connecting rod 6 to move the loading cam plates 5 and 5 in the arrow B direction. This loading cam plate 5, 5
The cartridge support frame 3 moves downward in the direction of arrow C as the sliding protrusion 4 is guided by the guide groove 5a of the loading cam plate 5, and the disc 2a in the cartridge case 2 is mounted on the turntable 13. To be done. This completes the disc loading. The completion of this disk loading is detected by the mechanical electric switch.

Next, the construction and operation of this mechanical electric switch will be described with reference to FIG. In the figure, 16
Is a main body of the mechanical electric switch, and 16a is an operating protrusion of the mechanical electric switch 16. The actuating protrusion 16a is movable up and down in the switch body 16 and moves in the direction of the arrow Y of the cartridge support frame 3 when the cartridge case 2 is inserted. It is supposed to be done.

When the mechanical electric switch 16 is depressed, the completion of loading is recognized, the turntable 13 is rotated, the head 14 is started to be moved by the linear motor 15, and the recording / reproducing of the disk 2a is started.

The ejection of the cartridge case 2 is performed by rotating the loading operation knob 12 in the direction of arrow D. That is, when the loading operation knob 12 is rotated in the arrow D direction, the operation lever 11 pushes down the transmission lever 9 of the loading operation transmission shaft 8 and moves the loading cam plates 5 and 5 in the arrow E direction. As a result, the cartridge support frame 3 rises in the direction of arrow F and returns to the initial position. When the cartridge support frame 3 returns to the initial position, the user pulls out the cartridge case 2 from the apparatus main body 1. This completes the ejection of the cartridge case 2.

In the process of this ejection operation, the mechanical electric switch 16 is released from the pressed state by the cartridge support frame 3. As a result, the rotating operation of the turntable 13 is stopped, and the head 14 is moved and returned to the initial position.

However, in the above-described conventional disc reproducing apparatus, since the mechanical electric switch 16 detects that the disc is mounted on the turntable 13, it has the following problems.

(1) The durability of the mechanical electric switch is only capable of enduring operation of about tens of thousands of times.

(2) If the disk reproducing device is used in a harsh environment, there is a risk of contact failure of the switch contacts. For example, contact failure is caused by the inclusion of foreign matter, the formation of a coating film by oxidation, the formation of a coating film of sulfide by sulfur released as gas from the rubber member in the apparatus, and the like. Moreover, abnormal contact occurs even if water or the like enters the device.

(3) Electrical instability, that is, a chattering phenomenon peculiar to the contact type may occur, so that some measure is required in the circuit and the cost is increased.

(4) In particular, when the recording medium is an optical disk, it is necessary to make the casing have a hermetically sealed structure in order to prevent dust and oil vapor from adhering to the surface of the optical lens. However, when the case has a sealed structure, the gases such as sulfur and silica described in the above item (2) accumulate in the case. Therefore, gold plating is applied to the contacts of the switch as a countermeasure. However, the use of gold-plated contacts causes a large cost increase.

(5) Since the mechanical electric switch requires a mounting portion such as a switch housing and a screw hole for mounting the switch, it hinders downsizing of the entire apparatus.

(6) In order to accurately detect the loading of the disk and the completion of the ejection, the mounting position of the switch is required to be accurate.

[0019]

As described above, in the conventional disc reproducing apparatus, since the disc mounted state is detected by the mechanical electric switch, the durability of the switch itself and the detection accuracy are poor, and It has also been an obstacle to downsizing of the entire device and cost reduction.

The present invention is intended to solve such a problem, and is capable of semi-permanently detecting a disk mounting state with high accuracy without being influenced by the operating environment of the apparatus or the mounting accuracy of the detection components. The purpose of the present invention is to provide a disc reproducing apparatus capable of performing the same.

[0021]

In order to achieve the above-mentioned object, a disk reproducing apparatus of the present invention is provided with a housing having an opening for inserting and removing a cartridge case accommodating a disk, and provided in the housing. A turntable for mounting and rotating the disk housed in the cartridge case, and a cartridge case provided in the housing and inserted through the opening to support the cartridge case with respect to the housing. A cartridge support that is movable between a first position in which the disk can be loaded and unloaded and a second position in which the disk can be mounted on the turntable, the cartridge support, and a separate member of the cartridge support. Mounted relative to the cartridge support, and when the cartridge support reaches the second position, the cartridge support is closest to the cartridge support. It is provided with a magnet and the Hall element detects the arrival at the said second position of the support.

[0022]

In the disc reproducing apparatus of the present invention, the cartridge case is inserted from the opening of the case to be supported by the cartridge support body, and the cartridge case is inserted as it is, so that the cartridge support body is at the first position. To a second position from. When the cartridge support reaches the second position, this is relatively attached to the cartridge support and another member (for example, a support member that movably supports the cartridge support in the housing). Magnetically detected by a magnet and a Hall element. Specifically, the output voltage of the Hall element is monitored by a microcomputer, and when the value exceeds a certain threshold value, it is determined that the cartridge support has reached the second position. When it is detected that the cartridge support has reached the second position in this way, for example, the turntable is driven to start the disc reproduction. Further, control such as stopping driving of the turntable is performed by detecting that the cartridge support is separated from the second position.

As described above, in the present invention, the detection of the disk mounting state is realized by using the non-contact type detection means using magnetism. Therefore, the detection can be performed semi-permanently with high accuracy without being influenced by the environment in which the device is used and the accuracy with which the detection components are attached.

[0024]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a perspective view showing the structure of a disk reproducing apparatus according to an embodiment of the present invention. In the figure, 10
Reference numeral 1 denotes a casing which is the main body of the disc reproducing apparatus.
An opening 102 is provided on the front surface of the housing 101 for inserting and removing a cartridge case (not shown) in which a disc is rotatably accommodated. A cartridge support frame 103 that supports the cartridge case inserted through the opening 102 is provided in the housing 101.
Sliding protrusions 1 are provided on both sides of the cartridge support frame 103.
04 are projected.

Further, on the outside of the cartridge support frame 103, a loading cam plate 105 having standing surfaces facing both side surfaces of the cartridge support frame 103 at both ends is arranged. On each upright surface of the loading cam plate 105, a lateral guide groove 106 that engages with the sliding protrusions 104 provided on both side surfaces of the cartridge support frame 103 is provided. Further, vertical guide grooves 107 intersecting with the horizontal guide grooves 106 are provided on both side surfaces of the housing 101, which face the respective standing surfaces of the loading cam plate 105.

Here, the lateral guide groove 106 has an inclination that descends from the front of the housing 101 toward the inside. Therefore, the cartridge support frame 103 has a sliding protrusion 104 when the cartridge case is inserted (when the disc is loaded).
Is guided while being engaged with the lateral guide groove 106 and the vertical guide groove 107, so as to descend in the direction of arrow C.

The loading cam plate 105 has a pair of elongated holes 108, 108 on its bottom plate. A guide pin 109 fixed to the chassis 111 is engaged with the pair of elongated holes 108. Further chassis 11
1 is provided with a guide member 110 for supporting the loading cam plate 105 in a slidable manner at a constant height. Therefore, the loading cam plate 105 can slide on the chassis 111 within a predetermined distance in the directions of arrows A and B by the engagement of the elongated holes 108, 108 with the guide pin 109 and the guide member 110. Has become.

A first rack gear 112 is fixed to the loading cam plate 105. The first to fifth gears 113a, 113b, 11 are attached to the first rack gear 112.
3c, 113d, and 113e are meshed in order. Here, the first gear 113a and the second gear 113b are the gear support plate 1
It is supported by 14. The gear support plate 114 has claw portions 114a and 114b at one end and an intermediate portion, respectively. One claw portion 114a is inserted into the opening 111a provided in the chassis 111, and the other claw portion 114b.
Is connected to the movable part of the solenoid 115.

That is, the solenoid 115 is connected to a mode switching plate 116 which is swingable about the rotary shaft 115a, and the notch portion of the mode switching plate 116 is connected to the claw portion 1.
14b is locked. Further, the gear support plate 114 is urged by the force of the spring 117 in the arrow X direction, that is, toward the rack gear 112.

When the solenoid 115 is in the non-driving state, the gear support plate 114 moves in the arrow X direction by the force of the spring 117, and the second gear 113b supported by the gear support plate 114 and the gear support plate 114. The third gear 113c, which is not supported by, is in a separated state. Then, when the solenoid 115 is driven, the gear support plate 114 moves in the direction of arrow Z against the force of the spring 117. As a result, the second gear 113b and the third gear 1
13c is adapted to mesh.

Further, 118 is a turntable and 119 is a pickup. The pickup 119 includes a pair of guide shafts 12 whose both ends are supported by the chassis 111.
It is supported so as to be capable of reciprocating in the radial direction of the disk along 0 and 120.

A second rack gear 121 is provided at one end of the pickup 119. This second rack gear 12
The above-described fourth gear 113d is meshed with 1.

Further, the feed motor 1 is attached to the fifth gear 113e.
22 motor shafts are connected. This feed motor 12
The rotation of the second gear 113 is driven by driving the second gear 113.
e and the fourth gear 113d and the second rack gear 121, and the pickup 119 is conveyed. Similarly, the rotation of the feed motor 122 is changed from the fourth gear 113d to the third gear 113c, the second gear 113b, and the first gear 113.
a, transmitted to the loading cam plate 105 via the first rack gear 112, and the loading cam plate 105 is moved.

Next, a mechanism for detecting a disc mounting state in the disc reproducing apparatus of this embodiment will be described.

In FIG. 2B, 201 is a magnet and 202 is a Hall element for detecting the strength of the magnetic field. Here, the magnet 201 is the cartridge support frame 1.
It is adhesively fixed to the lower surface of 03. On the other hand, Hall element 2
The circuit board 203 is mounted by soldering the circuit board 203 on the bottom plate surface of the loading cam plate 105 facing the bottom surface of the cartridge support frame 103, and is fixed thereto.
The output terminal of the hall element 202 is connected to the input terminal of the microcomputer via an A / D converter (not shown).

In this disc mounted state detecting mechanism, the magnet 201 and the Hall element 202 are respectively arranged when the disc in the cartridge case in which the cartridge supporting frame 103 is supported by the magnet 201 and the hall element 202 is in the position mounted on the turntable 118. Is selected and arranged so that the distance between the two is minimum and the output voltage of the Hall element 202 is maximum.

Further, the microcomputer is a hall element 2
A fixed threshold value is set for the output voltage of 02, and when the output voltage of the Hall element 202 exceeds this threshold value,
The judgment is made when the disc is mounted.

The disk loading operation including the detection of the disk mounting state will be described below with reference to FIGS. 2 to 6.

In the state before the cartridge case is inserted as shown in FIG. 2A, the solenoid 115 is OFF. Therefore, during this period, the gear support plate 114 is pulled in the arrow X direction by the force of the spring 117, and the second gear 113b supported by the gear support plate 114 and the third gear 113c not supported by the gear support plate 114 are separated. Are not meshed.

From this state, as shown in FIG. 2B, when the cartridge case 200 is inserted into the housing 101 and supported by the cartridge support frame 103, a detection switch (not shown) is turned on, and this detection switch is turned on. Energization of the solenoid 115 is started by the signal.

When the solenoid 115 is driven, FIG.
As shown in (a), the mode switching plate 116 is pulled in the arrow Z direction. As a result, the gear support plate 114 also has an arrow Z.
The second gear 113b and the third gear 113c.
Meshes with.

From this state, the feed motor 122 is rotationally driven in the direction of the arrow Y, and this rotation is from the fifth gear 113e to the fourth gear 113e.
Gear 113d, third gear 113c, second gear 113b,
It is sequentially transmitted to the first gear 113a. Here, the rotation of the fourth gear 113d is also transmitted to the second rack gear 121,
As a result, the second rack gear 121 picks up the pickup 119.
And moves in the direction of arrow A. At the same time, the first gear 113
The rotation of a is transmitted to the first rack gear 112, and the first rack gear 112 together with the loading cam plate 105 is indicated by arrow A.
Move in the direction.

By moving the loading cam plate 105 in the direction of arrow A, the cartridge supporting frame 103 is moved.
, As shown in FIG. 3 (b), descends in the direction of arrow C. FIG. 4 shows how the cartridge support frame 103 descends. As shown in the figure, the loading cam plate 10
When 5 moves in the direction of arrow A, the cartridge support frame 10
The sliding protrusion 104 provided on the loading cam plate 10
In the lateral guide groove 106 provided in 5, the disc is moved from a position where it hits before the disc is mounted to a position where it finishes the disc mounting.
At the same time, the sliding protrusions 104 move from the upper part to the lower part in the vertical guide grooves 107 provided on both side surfaces of the housing 101. In this way, the sliding protrusion 104 provided on the cartridge support frame 103 is guided by the horizontal guide groove 106 and the vertical guide groove 107, so that the cartridge support frame 103 is indicated by the arrow C.
The disk D in the cartridge case 200 is mounted on the turntable 118.

As the cartridge supporting frame 103 descends, the distance between the magnet 201 arranged on the lower surface of the cartridge supporting frame 103 and the Hall element 202 arranged on the upper surface of the loading cam plate 105 becomes gradually smaller, and the magnet becomes smaller. The magnetism of 201 is the Hall element 202
Start to affect.

After this, as shown in FIG. 5B, when the disk D in the cartridge case 200 is mounted on the turntable 118, the T of the pickup 119 is turned on.
At the same time when the movement to the OC position (on the disk center side) is completed, the microcomputer determines that the signal voltage output from the Hall element 202 exceeds the threshold value.

As a result, the microcomputer starts the rotation driving of the turntable 118 and cuts off the power supply to the solenoid 115. As a result, as shown in FIG. 6A, the second gear 113b and the third gear 113c are separated, and the rotation of the feed motor 122 is transmitted only to the second rack gear 121 via the fourth gear 113d. Like

Therefore, in this state, the pickup 119 is moved regardless of the loading operation, that is, the movement of the cartridge support frame 103, and the pickup 119 can be moved toward the target position.

Next, the operation for rejecting (discharging) the cartridge case 200 will be described.

First, when a reject button (not shown) is pressed, the microcomputer operates the solenoid 115.
To drive. As a result, the second gear 113b and the third gear 1
13c is engaged.

Then, the feed motor 122 is driven in the direction opposite to the arrow Y to move the first rack gear 112 and the second rack gear 121 in the arrow B direction. As a result, the sliding protrusion 104 moves from the lower traverse portion 106c in the lateral guide groove 106 to the upper traverse portion 106a in the opposite direction to the above, and also moves from the lower portion to the upper portion in the vertical guide groove 107, so that the cartridge support frame 103 is moved. Lift to separate the disc from the turntable 118.

By thus raising the cartridge support frame 103, the magnet 201 and the Hall element 2 are
The microcomputer determines that the output voltage of the Hall element 202 has become less than or equal to the threshold value due to the increase in the distance from the sensor 02. After that, the microcomputer stops the rotation drive of the turntable 118.

Thus, according to the disc reproducing apparatus of the present embodiment, the following effects can be obtained by constructing the mechanism for detecting the disc mounting state from the magnet 201 and the Hall element 202.

(1) Since it is a non-contact type switch, it withstands repeated use in a semi-permanent manner and is not much affected by the operating environment and mounting accuracy.

(2) Since the magnet 201 and the circuit board 203 are attached by adhesion or the like, and the Hall element 202 is attached on the circuit board 203 by soldering or the like, the attaching operation itself is easy and the attaching place is restricted. Is reduced.

(3) The countermeasure against the chattering phenomenon becomes unnecessary, and the cost increase can be suppressed. The magnet 201 may be attached to the bottom plate surface of the loading cam plate 105, and the hall element 202 may be attached to the bottom surface of the cartridge support frame 103.

[0057]

As described above, according to the disc reproducing apparatus of the present invention, the disc mounting state is detected with high accuracy semipermanently without being influenced by the environment of use of the apparatus or the accuracy of mounting the detection parts. be able to.

[Brief description of drawings]

FIG. 1 is a perspective view showing a configuration of a disc reproducing apparatus according to an embodiment of the present invention.

2A and 2B are a plan view and a cross-sectional view showing a state before the cartridge case of the disc reproducing apparatus of FIG. 1 is inserted.

3A and 3B are a plan view and a cross-sectional view showing a state in which the disc reproducing apparatus of FIG. 1 is being inserted into a cartridge case.

FIG. 4 is a perspective view showing an engaged state of a sliding protrusion and a lateral guide groove and a vertical guide groove that guide the sliding protrusion as the cartridge support frame descends.

5A and 5B are a plan view and a cross-sectional view showing a state immediately after the disc mounting of the disc reproducing apparatus of FIG. 1 is completed.

6A and 6B are a plan view and a cross-sectional view showing a state immediately after the disc mounting state of the disc reproducing apparatus of FIG. 1 is detected.

FIG. 7 is a perspective view showing a conventional disc reproducing apparatus.

8 is a side view for explaining the configuration and action of a switch for detecting a disc mounting state in the disc reproducing device of FIG. 7. FIG.

[Explanation of symbols]

101 ... Housing, 103 ... Cartridge support frame, 104 ...
Sliding protrusion, 105 ... Loading cam plate, 106 ... Horizontal guide groove, 107 ... Vertical guide groove, 108 ... Long hole, 109 ... Guide pin, 110 ... Guide member, 111 ... Chassis, 112 ...
1st rack gear, 113 ... Gear, 114 ... Gear support plate,
115 ... Solenoid, 116 ... Mode switching plate, 117 ...
Spring, 118 ... Turntable, 119 ... Pickup, 120 ... Guide shaft, 121 ... Second rack gear,
201 ... Magnet, 202 ... Hall element, 203 ... Circuit board.

Claims (2)

[Claims] 1. A casing having an opening for inserting and removing a cartridge case accommodating a disc, and a turntable provided in the casing for rotating and driving the disc accommodated in the cartridge case. A first position, which is provided in the housing, supports the cartridge case inserted through the opening, and allows the cartridge case to be taken in and out of the housing, and a first position at which the disc can be mounted on the turntable. The cartridge support, which is movable between the second position and the second position, is attached relatively to the cartridge support and another member of the cartridge support, and the cartridge support reaches the second position. A magnet and a Hall element for detecting the arrival of the cartridge support at the second position when the cartridge support is closest to the second position. A disk reproducing device characterized by being. 2. The disc reproducing apparatus according to claim 1, further comprising a support member that movably supports the cartridge support in the housing between the first position and the second position. A disc reproducing apparatus, wherein one of the magnet and the Hall element is attached to the cartridge support, and the other is attached to the support member.