JPS6331251Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION This invention relates to a disc record playback device suitable for, for example, a DAD (digital audio disk), and particularly to a pick-up position display device thereof. Recently, in the field of audio equipment, digital recording and playback methods that utilize PCM (pulse code modulation) technology are being adopted in order to achieve high-fidelity playback as much as possible. In other words, this is what is called digital audio conversion, and the principle is that the audio characteristics are far superior to conventional analog systems without depending on the characteristics of the recording medium. This is because it has been established. In this case, a system that uses a disk as a recording medium is called a DAD system.
Optical, electrostatic, and mechanical playback methods have been proposed, but no matter which playback method is adopted, the playback device that embodies it is still a conventional one. It is required to be able to satisfy various advanced functions and performances that are not commonly seen before. For example, among optical playback methods, the one proposed as the CD (compact disc) method uses a CLV (constant linear velocity) method to play a disc with a diameter of 12 cm and a thickness of about 500 to 200 r.p.m. Although the disc is driven at a variable rotation speed, the track pitch of the disc is 1.6 μm, and it is said that a huge amount of information can be recorded on one side, enough for approximately 1 hour of stereo playback. It makes sense. Therefore, this idea was made in view of the above points, and is particularly useful in disc record playback devices that play back with a pick-up arranged on the back side of the disc, in which the pick-up position can be displayed reliably with a simple configuration. It is an object of the present invention to provide an extremely good pick-up position display device that achieves the above-mentioned characteristics. That is, the pick-up position display device according to this invention is connected to the pick-up or the feed mechanism of the pick-up in a disc record playback device in which a pick-up for playback is disposed on the back side of the disc to be played, which has an information signal. a connecting portion that is approximately L-shaped and is formed approximately perpendicular to the feeding direction of the pickup and has a length that approximates the radius of the disk to be reproduced;
The present invention is characterized in that the distal end of the connecting portion is provided with a display element or a pointer that can be monitored from the outside, and a position display section that displays the display element or pointer on the surface side of the disc to be reproduced. Hereinafter, with reference to the drawings, an embodiment of this invention will be described in detail as applied to a CD type DAD playback device. That is, FIG. 1 shows an external perspective view of a DAD playback device using the CD method, and above all, a DAD (hereinafter simply referred to as disk) loading mechanism section 100 provided on the front panel of the cabinet 10.
It is a so-called kangaroo pocket type in which the pocket rotates in the direction of the arrow A shown in the figure by operating the eject operation key (EJECT), and all you have to do is insert a disk (not shown) vertically into the pocket. It is characterized in that it is automatically carried and loaded into a drive device for vertical reproduction, and the details thereof will be described later. In addition, (POWER) in FIG. 1 is a power operation key that is operated prior to operating the eject operation key (EJECT), below (FF) is a fast forward operation key, (BACKWARD) is a reverse operation key,
(STOP) is a stop operation key, (PLAY) is a playback operation key, and (PAUSE) is a pause operation key.
Further, 200 is a disk drive and playback mechanism provided in the cabinet 10, the details of which will be described later. And 1
Reference numeral 1 denotes a printed wiring board on which a disk drive and reproduction circuit, etc. are mounted. Further, reference numeral 12 designates various display sections provided on the front panel of the cabinet 10. First, the disk loading mechanism section 100 will be described. FIGS. 2 and 3 show the state before and after disk loading, respectively. Further, FIGS. 4 and 5 respectively show a state in which the interior of FIG. 3 is seen through and a state in which a part is cut away. First, to briefly describe the outline of the disk loading function with reference to FIG. 2 (however, the disk 101 is not shown), a pair of left and right loading levers 118 and Main link 103,
120 is pulled in the direction of arrow B. As a result, the holder 105 having the pocket portion 170 for inserting the disk and the disk clamper portion 180 are also pulled in the same direction, resulting in the state shown in FIG. This leads to the following. Here, a motor 139 shown in FIG. 6 is used as the power source, and the motor 139 is attached to the lower part of the rear surface of the chassis 124, which is approximately U-shaped in plan, through a motor mounting portion 141, so that the motor shaft thereof is directed downward. It is installed in the same condition. The lower end of the drive shaft 135 is fitted into a pulley 137 connected via a belt 138 to a motor pulley 140 attached to the motor shaft. Here, the upper end of the drive shaft 135 is rotatably supported by a bearing 133 that is press-fitted into a bent portion at the upper rear surface of the chassis 124, and a nut 144 is attached to the bent portion at the lower rear surface of the chassis 124 near its lower end. Since it is inserted through a bearing 36 fixed by a bearing 36, it is also freely rotatable in forward and reverse directions in conjunction with the forward and reverse rotation of the motor 139. Threaded portion 1 in approximately the upper half of this drive shaft 135
35a and the substantially lower half non-threaded portion 135b, the main slider 123 is fitted at bent portions above and below the center thereof. In other words, main slider 12
3, the rotation of the drive shaft 135 in the direction of the arrow C causes the drive shaft 135 to rotate in the direction of the arrow E in the downward direction in the figure and in the direction of the arrow D of the drive shaft 135.
By rotating the direction, it is moved in the upward direction of the arrow F in the figure. In this case, the movement stroke of the main slider 123 is
By controlling the motor drive circuit (not shown) on and off through micro switches 142 and 143 which are turned on and off at the upper and lower sides of the figure by 23, it is regulated to ensure that there is no excess or deficiency. FIG. 2 shows the main slider 123 in a fully downward position, and FIG. 3 shows the main slider 123 in a fully upward position. The links 1 each have a long hole at one end pivoted at the bottom of the bent pieces on both sides of the main slider 123.
22 and 145 are connected at their respective other ends to respective one ends of connection levers 121 and 146 whose sides are approximately L-shaped. The connecting levers 121, 146 are attached to the pillars 14 attached to the lower sides of the chassis 124 at their corners.
The loading lever 11 is rotatably supported with respect to the loading lever 11, and the other end is rotatably supported with respect to the loading lever 11.
8 (however, the connection lever 146 side is not shown). It is configured to slide along the hole 160. Further, the aforementioned main link 12 whose lower end is pivotally supported at the tip of the loading lever 118
0 and 103 are rotatably supported at both front sides of a top cover 125 mounted on the chassis 124 at their upper ends. In addition, in the above, coil springs 12 are provided between the support portions at both ends of the links 122 and 145, respectively.
8,167 is attached. On the other hand, the disk clamper part 180 is supported by a clamper presser lever 111 which is rotatably supported at the center with respect to a pair of shafts 107 and 117 attached to the inside tips of a pair of left and right loading levers 118.
have. The link mounting plate 112, which is located in front of the clamper presser lever 111 and erected on the loading lever 118, has two links 109, 110 and 11 on both sides and above and below.
Clamper presser lever 111 via 3,114
A clamper holder 127 located on the rear side is supported rotatably (translationally). In this case, the clamper presser lever 111 and the clamper holder 127 are mutually attracted to each other by the engagement pull 166, and the collar of the clamper 126 protruding from the elongated hole of the clamper holder 127 is disposed between them. Hold the clamper 126 between the clamper levers 11 and 126.
It is lightly pressed in one direction (however, the state shown in Figure 2). Further, the levers 108 and 116 whose distal ends are rotatably supported by the pair of shafts 107 and 117 have their respective proximal ends connected to each other by a connecting lever 129 (see FIG. 4). . The holder 105 is rotatably supported by the main links 103 and 120 at the lower portions of both sides thereof, and the holder lever 150, which has a substantially U-shaped plane and has a base end attached to the rear side of the holder 105, is attached to the holder lever 150. Rollers 151 provided at the tips of both sides are formed in the inclined elongated hole 1 formed at the bottom of both sides of the chassis 124.
52 so as to be slidable along the line 52. In other words,
The inclination of the holder 105 is changed depending on the position of the roller 151 in the inclined elongated hole 152 (see FIG. 5). The cover 102, which is rotatably supported on the upper end of the holder 105, has a spring 164 engaged between it and the center of the front end of the top cover 125.
The top cover 125 is constantly pulled slightly by the top cover 125. Furthermore, by attaching a pair of front holders 106 and 119 to the left and right front sides of the holder 105, a pocket portion 170 for inserting a disk is formed between the opposing portions. A disk support lever 115 is provided at the bottom of the pocket portion 170 . Here, the disk support lever 115 is rotatably supported by the holder lever 150 as shown in FIG.
(see FIG. 8), it is always urged in the direction of arrow H, and is pressed against an adjustment screw 155 attached to the holder lever 150. A clamp lever 130 is rotatably supported by a clamp lever mounting plate 131 via a shaft 132 behind the holder lever 150. This clamp lever mounting plate 131 is attached to the chassis 1.
It is attached to the rear plate part of 24. A bush 156 is attached to the rear end of the clamp lever 130 at a position passing through the chassis 124, and the bush 156 is attached to the slider 134 (see FIG. 8). Here, the slider 134 has its long hole connected to the pin 12 provided at the bottom of the main slider 123.
A spring 158 is engaged between the bush 156 and a pin 157 that is engaged with the bush 156 and is attached to the bent portion of the pin 157. In addition, 159 in FIG. 5 is a holder lever 150.
This is a reflective sensor for disc detection attached to the disc. Further, reference numeral 161 is a turntable for driving a disk that is provided to protrude from the introduction hole 105a (see FIG. 2) on the back side of the holder 105, and has a guide 161a that is fitted into the center hole of the disk 101. . In this case, the turntable 161 is supported by the shaft of a disk drive motor 162 supported within the chassis 124, which will be described in detail in the disk drive and playback mechanism section 200 described later. . Next, the details of the disk loading operation in the above configuration will be explained.
FIG. 8 shows the relationship of the main parts when viewed from the right side of the state shown in FIG. 2 in which the disk pocket portion 170 is fully opened outward. That is, in this state, the main slider 12
3 is too low and the loading lever 11
8 is pushed up to the uppermost end of the elongated hole 160, so that the disk clamper portion 180 is in a state of being inclined outwardly. However, in this case, the disk pocket section 170
Since the holder lever 150 is regulated by the elongated hole 152, the inclination of the disk clamper section 180 and the lid 16 provided on the outside thereof are limited.
It has a small slope compared to 3. In this state, the disk pocket section 170
When a disk 101 (not shown) is inserted, the aforementioned reflection sensor 159 detects this and provides a start signal to a drive circuit (not shown) for the motor 139 to drive the motor. Here, the disk 101 inserted into the disk pocket part 170 is attached to the support pins 115a and 115b of the disk support lever 115 at two locations on the lower side.
(see FIG. 9), so that the center of the disk substantially coincides with the center of the turntable 161. When the main slider 123 is moved upward as described above by the drive of the motor 139, the loading lever 118 is pushed down toward the lower end of the elongated hole 160 via the link 122 and the connecting lever 121. As a result, an operation of pulling the disc clamper section 180 and the disc pocket section 170 in the direction of arrow B is started. FIG. 10 shows that the disk 101 is
The disk clamper section 180 and the disk pocket section 170 are shown in a state where they have been retracted to the instant when they are about to be pushed onto the turntable 161. In this state, the main slider 123 has been moved considerably upward, and the loading lever 11
8 has one end located exactly at the boundary between the inclined portion and the horizontal portion of the elongated hole 160. In other words, although the loading lever 118 is slightly inclined because the main link 120 has not reached the vertical position, it is almost horizontal. FIG. 11 shows the state of the disk clamper section 180 at this time. That is, in this state, the clamper 127 is held in a nearly vertical state, being held between the clamper presser lever 111 and the clamper holder 127, as in the state shown in FIG. 8, and the disk 101 is brought into contact with the clamper 126 by gravity. Even if it is tilted in the direction of contact, it will not tilt as a result. Conversely, during the movement process, the disk 101 is moved to the turntable 1.
61, the disc 101 is pressed against the clamper 126, which is moved in the same direction, due to the frictional force between the turntable 161 and the disc 101. This function corrects the tilt of the disc 101. It is accompanied by In addition, in this state, the disk support lever 115
is in the same state as in FIG. 8, but one end is coming into contact with the bent portion of the clamp lever mounting plate 131. Further, the connecting bar 129 connecting the left and right levers 108 and 116 is in contact with the clamp lever 130, but since the spring 158 has not yet been expanded, only a weak pressure is applied by the spring 168 of the clamp lever 130. do not have. Note that the upper end portions of the left and right levers 108, 116 are in light contact with the link pins 164, 165. Figures 12 and 13 show the state in which disk loading has been completed, and the main slider 1
23 is going up and it's tight. In addition, the left and right connecting levers 121, 146 are connected to springs 128, 16.
7, and pulls the loading lever 118 backward along the elongated hole 160. Then, the clamp lever 130 is attached to the slider 1.
34 has been moved upward by the main slider 123, it is rotated in the direction of arrow I in the figure under the tension of the spring 158, thereby pushing down the connecting bar 129. This results in
When the left and right levers 108, 116 are rotated to push the link pins 164, 165 in the direction of arrow J in the figure with their respective upper end curved portions, the links 109,
113, 110, and 114 are rotated to push down the clamper holder 127 in parallel. In other words, as shown in FIG. 14a, the clamper holder 127 had previously been fitted to the clamper 126 at the lower part of its elongated hole 126a;
Links 109, 113 at the same time as being moved in the direction
and 110, 114, this time the first
As shown in FIG. 4b, parallel movement is also carried out in the downward direction in the drawing so that the elongated hole 126a is fitted in the center. Further, at this time, since the clamper presser lever 111 is pushed in the direction of arrow J by the bent portions 108a and 116a at the upper ends of the left and right levers 108 and 116, the clamper 126 is also pushed in the same direction. In this case, since the disk 101 is in contact with the turntable 161, the clamper 126 is pressed toward the turntable 161 with a constant pressure determined by the spring 158. In this state, the clamper 126 is placed between the clamper 126 and the clamper holder 127.
Sufficient clearance is created for rotation. In addition, since the rear end of the disk support lever 115 is in contact with the bent end of the clamp lever mounting plate 131 and the front end is rotated horizontally,
The support pins 115a and 115b are the disk 10
1 (see Figure 15). That is, as described above, the disk 101 is loaded onto the turntable 161 and becomes rotatable by the motor 162, which means that the series of operations necessary for disk loading is completed. Note that the anti-loading operation for removing the disk 101 from this state can be performed by following the completely opposite process to the above-described loading operation, and will therefore be omitted. In addition, when the disk loading is completed, the pick-up introduction hole 10 on the back side of the holder 105
Optical pick-up from section 5b (see Figure 2)
The PU is exposed (see FIGS. 18 and 19) and the signal surface of the disk 101 is reproduced in a linear tracking manner, which will be described in detail in the disk drive and reproduction mechanism section below. Next, the features of the disk loading mechanism section 100 as described above will be explained. First, in order to easily and reliably load a disk, the disk 101 can be automatically loaded into a predetermined drive position by simply inserting the disk 101 into the disk pocket 170 in a substantially vertical direction. One example is a vertical disk loading mechanism. This vertical disk loading mechanism has one main link on the front of the cabinet.
A disk pocket section 170 for inserting the disk 101 and a disk clamper section 180 for clamping the disk 101, which are commonly supported by 20 and 103 so as to be openable and closable with the upper end as a fulcrum, and the lower ends of these disk pocket section 170 and disk clamper section 180 . The disc pocket part 170 and the disc clamper part 1 are connected in common.
Power transmission mechanism 118, 1 that opens and closes 80
21, 122, and a power source 139 that transmits power to this power transmission mechanism. The second point is that in the above-mentioned vertical disk loading mechanism, the disk pocket portion 17
The disk clamper section 180 is provided with a function of correcting the inclination of the disk 101 inserted into the disk 101.
The pressing force required for this is reduced as much as possible, thereby contributing to a smaller, lighter, and simpler structure, and at the same time, damage to the disk can be prevented. Then, the clamper 126 of the disc clamper section 180 moves the disc 101 inserted into the disc pocket section 170 onto the turntable 16.
This is achieved by adding a clamper control mechanism to the above-mentioned vertical loading mechanism to make the rear end surface of the clamper 126 parallel to the surface of the turntable 161 immediately before pressing in one direction. The third point is that in the above-mentioned vertical disk loading mechanism, the disk pocket portion 17
One advantage is that the disk pocket portion 170 has the function of centering the disk inserted into the center of the disk, thereby further promoting the same effect as the second point mentioned above. This means that the center hole of the disk 101 inserted into the disk pocket portion 170 is inserted into the guide 161a of the turntable 161 at least from immediately before the center hole is fitted to the guide 161a of the turntable 161 until the center hole of the disk 101 is fitted.
01 is at the same height as the center of the turntable 161, and the center hole of the disk 101 is fully fitted to the guide 161a of the turntable 161. a second position in which the disk support control mechanism 1 is separated from the disk support control mechanism 1;
15 to the above-mentioned vertical loading mechanism. The fourth point is that in the above-mentioned vertical disk loading mechanism, the disk clamper section 1
The clamper 126 of 80 is attached to the disk pocket part 1.
When pressing the disk 101 inserted into the turntable 70 toward the turntable 161, the clamper 126
After the guide 161a of the turntable 161 and the guide 161a of the turntable 161 are fitted together, the clamper 126 presses the disk onto the turntable 161.
One of the points is that the disk clamper section 180 is provided with a function of controlling the timing of clamping with respect to 1, thereby achieving the same effect as the second point mentioned above. This is because the clamper control mechanism 116 applies a predetermined pressing force in the direction of the turntable 161 to the clamper 126 after the disk 101 is fitted into the guide 161a of the turntable 161. This is achieved by adding it to the loading mechanism. The fifth point is that in the above-mentioned vertical disk loading mechanism, the disk pocket portion 17
A sensor 159 for detecting the insertion state of the disc 101 inserted into the disc pocket 170 is installed separately from the optical pickup for disc playback.
By providing the disc 101 in itself, the presence or absence of the disc can be detected before the disc 101 is loaded into a predetermined drive device, that is, a turntable section. In this case, the disk pocket section 170
The mounting position of the disk sensor 159 is at the bottom of the disk pocket part 170 on the disk 101.
If the position is slightly above the outermost periphery of the disk 101, it is possible to determine whether the disk 101 is improperly inserted (see FIG. 16). Next, the disk pocket portion 17 in the vertical disk loading mechanism 100 as described above will be explained.
Various feature points applied to 0 will be explained. The first point is a first position in which the disc pocket part 170 into which the disc 101 is inserted is moved to the front side of the turntable 161 in the disc inserted state, and a first position in which the disc pocket part 170 into which the disc 101 is inserted is moved to the front side of the turntable 161 and the disc pocket part 170 is moved from the first position to the disc pocket part 170 in which the disc 101 is inserted.
1 on the turntable 161 and has a second position in which the disk 101 loaded on the turntable can be rotated inside the disk pocket part 170 , the entire vertical disk loading mechanism The point is that the structure of the system can be made organic and rational. The second point is that the disk insertion opening of the disk pocket 170 is sloped at least on the signal surface side of the disk 101 so that it is narrower at the peripheral edge of the disk 101 and wider at the center of the disk 101. By adopting this structure, it is possible to prevent damage to the signal surface of the disk when the disk is inserted (see FIGS. 17a, b, and c). The third point is that the disk moves to a first position in front of the turntable 161 when the disk is inserted, and a second position that moves from the first position and allows the disk 101 to be loaded onto the turntable 161 when the disk is loaded. It is rotatably supported using the upper back surface of the pocket portion 170 as a fulcrum,
By providing the cover 102 which is inclined rearward on the back surface of the disk pocket section 170 in the first position and upright above the back surface of the disk pocket section 170 in the second position, the upper end of the disk 101 is protected when the disk is inserted. One of the features is that a space for grasping is formed at the rear to facilitate the insertion and removal of the disk. In this case, it may be possible to fix the cover in an inclined position from beginning to end, but doing so would avoid the inconvenient situation of the cover hitting the disc playback pickup located at the rear of the disc pocket. arise. Further, by providing the rotatable cover 102, there is an advantage that the size of the disk pocket portion 170 and the overall size of the device can be made as small as possible. The fourth point is to prevent the disc 101 from being incorrectly inserted into the turntable introduction hole 105a and the pick-up introduction hole 105b, which are formed in connection with the back surface of the holder 105 of the disk pocket part 170 . As shown in FIGS. 18a and 18b, guides 105c and 105d are formed in the form of claw-like protrusions whose lower side with respect to the upper and lower connecting portions of both introduction holes 105a and 105b is inclined rearward. In other words, both the introduction holes 105
When the disk 101 attempts to be inserted incorrectly into the connecting portion of the disks 105a and 105b, the lower end of the disk hits the rearwardly inclined lower guide 105d, preventing the disk from entering, and the disk pocket 170
It is something that begins to slide inside. Note that the guide may be formed on a substrate (not shown) provided at the rear of the holder 105. The fifth point is that the upper ends of the front holders 106 and 119 constituting the disc pocket part 170 are connected to at least the introduction hole 1 of the disc pocket part 170 .
By extending it to a position higher than the height of the optical axis L of the optical pickup PU section (which will be described later) exposed from the 05b section (this is the same as the height of the center of the turntable 161), the optical pickup section One point is that safety measures for the human body (especially important in the case of a laser light source) are taken to prevent the emitted light from directly leaking to the outside (see FIG. 19). It is also assumed that this is ensured even when the disk pocket section 170 is opened.
Furthermore, it is even more effective if the upper ends of the front holders 106 and 119 are made opaque. Next, the disk drive and playback mechanism section 200
To explain this, as shown in FIGS. 20 and 21, the disk drive and playback mechanism section 200 is located behind the disk pocket section 170 of the disk loading mechanism section 100 described above and is incorporated into the chassis 124. It is something. Here, the disk drive and playback mechanism section 200
To briefly describe the outline, it is divided into a disk drive section 210 and a disk playback mechanism section 220, and the former is a section where the disk 101 is loaded into the drive position by the disk loading mechanism section 100 mentioned above. A turntable 161 and a motor 162 directly connected to the rear of the turntable 161.
1 to drive at a predetermined rotational speed of the CLV system. As mentioned above, the latter is an optical pickup PU for playing back a disk that is driven at a predetermined rotational speed, and a linear tracking type that moves the pickup PU from the inner circumference to the outer circumference in the radial direction on the back side of the disk. It consists of a pick-up feed mechanism 221 that moves the pick-up. In this case, the turntable 161 and the pick-up PU are inserted into each introduction hole 105 formed on the back surface of the holder 105 that constitutes the disk pocket section 170 .
As described above, it is introduced into and exposed to the insides of a and 105b. Then, the pick-up feed mechanism 221
As shown in the figure, three mounting blocks 223, 22 are provided at predetermined intervals on the mounting board 222.
4,225, the motor 226 attached to the inside of the rightmost mounting block 225, and this motor 2
A series of gear trains 229, 230 to which rotation is transmitted via a belt 228 from a motor pulley 227 directly connected to the shaft of 26, and this gear train 229, 230
A feed screw 231 is pivotally supported at the final part of the feed screw 231, and a feed base 233 is screwed onto the feed screw 231 and inserted through the feed guide shaft 232, and the pick-up PU is mounted on the feed base 233. It is something that Here, the series of gear trains 229 and 230 are connected to the outside of the right-most mounting block 225 and to the right-most mounting block 225 and the center mounting block 2.
24 to provide a predetermined reduction ratio. Further, the feed screw 231 and the feed guide shaft 232 are vertically installed in parallel between the center mounting block 224 and the left end mounting block 223. Note that the central mounting block 224 is equipped with a turntable 161 that constitutes the disk drive section 210.
A motor 162 is mounted on the inside, which is not visible in the figure, so that the motor 162 is located on the upper side. That is, in the above configuration, the pick-up feed mechanism 221 transmits the rotational force from the motor 226 to the feed screw 231 with a predetermined reduction ratio through a series of gear trains 229 and 230, thereby extending the feed bar 233. In this case, the pick-up PU is moved in the direction of arrow K at a predetermined minute speed determined by the pitch of the feed screw 231. As a result, the pick-up PU is sent in a linear tracking manner along the signal surface on the back side of the disk driven at a predetermined rotational speed, and in the process, each track on the disk is optically reproduced. I will do it. Next, the pick-up feed mechanism 221 in the disk drive and playback mechanism section 200 as described above will be described.
The various features added to the section will be explained. The first point is the feed base 233 and the feed screw 231.
One point is that the pick-up PU can be fed smoothly by eliminating uneven feeding due to play in the threaded part between the two. As shown in FIG. 23a, the spring 23 is inserted into a groove 233a formed on the feeding direction side of the threaded portion of the feeding base 233 with the feeding screw 231.
4 and attach this spring 234 to the pin 235.
Stopper screw 23 supported on feed base 233
6, it is realized by a configuration in which the pressure is applied in the direction M opposite to the feeding direction K. That is, as a result, the pick-up feed table 233 and the feed screw 231 are always brought into contact with each other without any play in the feed direction K, as shown in FIG. 23b. The second point is that the position of the pickup PU can be displayed easily and well to the outside. This is located on the back side of the disk,
As shown in FIG. 24, an L-shaped arm 237 extending above the pick-up PU (or a pick-up feed base 233) and having a length approximating the radius of the disk 101 has, for example, a triangular light emitting diode or a simple A pointer 238 is attached, and the light emitting diode or pointer 238 is movable within a slit-shaped window 239 formed above the disk pocket portion 170 with the light emitting diode or pointer 238 assembled in the cabinet 10 as shown in FIG. The L-shaped arm 237 extending above the pick-up PU (or feed table 237) is
The pick -up PU is positioned approximately perpendicular to the direction of arrow K shown in FIG. a connecting portion that is connected to the pick-up feeding mechanism, is approximately L-shaped, is formed substantially perpendicular to the pick-up feeding direction, and has a length that approximates the radius of the disk to be reproduced; A display element or a pointer that can be monitored from the outside is provided at the tip of the connecting part, and a position display part is provided to display the display on the surface side of the disc to be reproduced.This is realized by an external display structure. It goes without saying that this invention is not limited to the embodiments described above and illustrated, and that various modifications and applications can be made without departing from the gist of this invention. Therefore, as detailed above, according to this invention, it is possible to display the pick-up position with a simple structure and in a reliable manner, especially in a disc record playback device that plays back a pick-up provided on the back side of the disc. It becomes possible to provide an extremely good pick-up position display device.

[Brief explanation of the drawing]

FIG. 1 is an external perspective view showing a CD-type DAD playback device applied as an embodiment of this invention;
2 and 3 are side perspective views showing the disk loading mechanism shown in FIG. 1 before and after loading, respectively, and FIGS. 4 and 5 are respectively a perspective view of the inside of FIG. 6 is a rear perspective view showing the power transmission section of the disk loading mechanism in FIG. 1, and FIGS. 7 to 15 are respectively from FIG. 2. A side view, a side perspective view, and a front view of the main parts for explaining the series of loading operations leading to the state shown in FIG. 3, and FIGS. 16 to 19 respectively show the disk pocket in the disk loading mechanism shown in FIG. 1. 20 and 21 are side views, top views, and front views of the main parts for explaining various features of the main parts, respectively, and FIGS. Perspective view, 22nd
The figure is a perspective view showing the pick-up feed mechanism section of FIG. 20 and FIG. 21, and FIG. 23 to FIG.
FIG. 3 is a cross-sectional view and a perspective view of essential parts for explaining various features of the pick-up feed mechanism shown in the figure. 10...cabinet, 11...printed wiring board,
12...Display unit, 100 ...Disk loading mechanism unit, 200 ...Disk drive and playback mechanism unit, 101...Disk, 102...Cover,
103,120...Main link, 104,12
8,149,158,166,167,168...
... Spring, 105 ... Holder, 106,1
19...Front holder, 107, 117...
Shaft, 108, 116... Lever, 109, 11
0,113,114...link, 111...clamper presser lever, 112...link mounting plate, 1
15... Disc support lever, 118... Loading lever, 121, 146... Connection lever,
122, 145... Link, 123... Main slider, 124... Chassis, 125... Top cover, 126... Clamper, 127... Clamper holder, 129... Connection bar, 130
... Clamp lever, 131 ... Clamp lever mounting plate, 132 ... Shaft, 134 ... Slider,
135... Drive shaft, 133, 136... Bearing, 1
37...Pulley, 138...Belt, 139...
Motor, 140... Motor pulley, 141... Motor mounting plate, 142, 143... Micro switch, 144... Nut, 147, 151... Roller, 148... Support column, 150... Holder lever, 152, 160... ... Slanted long hole, 155 ... Adjustment screw, 156 ... Button, 157 ... Pin,
159...sensor, 161...turntable, 162...motor, 163...lid, 164,
165...link pin, 170 ...disc pocket section, 180 ...disc clamper section, 10
5a, 105b...Introduction hole, 105c, 105d
...Guide, PU...Pickup, 210...
Disc drive unit, 220... Disc playback mechanism unit, 221... Pick-up feed mechanism, 222...
...Mounting board, 223,224,225...Mounting block, 226...Motor, 227...Motor pulley, 228...Belt, 229,230...
Gear train, 231...Feed screw, 232...Feed guide shaft, 233...Feed stand, 234...Spring, 235...Pin, 236...Stopper screw, 237...Arm, 238...Light emitting diode or pointer .

Claims (1)

[Scope of utility model registration request] In a disc record playback device comprising a playback pick-up disposed on the back side of the disc to be played that has an information signal, the device is connected to the pick-up or to a feeding mechanism of the pick-up,
a connecting portion that is approximately L-shaped and is formed approximately perpendicular to the feeding direction of the pickup and has a length that approximates the radius of the disk to be reproduced; and a connecting portion that can be monitored from the outside at the tip of the connecting portion. A pick-up position display device comprising: a position display section provided with a display element or a pointer to display the position on the front side of the disc to be reproduced.