JPH0927180A - Disk player - Google Patents

Abstract

PROBLEM TO BE SOLVED: To miniaturize a disk player with a simple structure and the small number of parts. SOLUTION: A disk supporting tray 1 is arranged in a casing 2 so as to exit in back and forth directions and a driving mechanism 3 for reading information recorded in a disk placed on the tray 1 in the casing 2 is arranged. In this disk player, the driving mechanism 3 is constituted so as to change its posture between a horizontal posture to be engaged with the disk on the tray 1 by rocking up and down with an elastic body 24 in its rear part as a center and an inclined posture to be moved away from the disk on the tray 1. Further, a cam mechanism 4 for changing this driving mechanism 3 from the horizontal posture to the inclined posture before the advance movement of the tray 1 and changing this from the inclined posture to the horizontal posture after the retreating movement of the tray 1 is provided between the front part of the driving mechanism 3 and the easing 2.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a disc player for reproducing, recording or erasing an optical disc or a magneto-optical disc, which is abbreviated as a CD, MD or the like.

[0002]

2. Description of the Related Art Conventionally, an example of a disc player is disclosed in Japanese Utility Model Publication No. 6-50859. This is a disc supporting tray that can move forward and backward, a drive mechanism that can move up and down to read information recorded on a disc placed on the tray, and a drive mechanism that raises and lowers the drive mechanism. An elevating and lowering drive mechanism, and the elevating and lowering drive mechanism has a pair of slide plates disposed on both sides of the drive mechanism so as to be movable back and forth, and at both front and rear ends of each slide plate along the movement direction thereof. An engaging groove having an upper groove portion and a lower groove portion is formed, and four engaging pins protruding from the front and rear end portions of both side surfaces of the drive mechanism are engaged with the engaging grooves. A drive switching plate for selectively engaging the rack provided on the slide plate and the rack provided on the tray with the drive pinion is provided.

In the above structure, when the tray is in the retracted state, both the slide plates move forward to engage the upper groove portion of the engaging groove with the engaging pin, whereby the drive mechanism is raised to engage the disc on the tray. When the drive pinion meshing with the rack on the slide plate side is normally rotated from this state, the slide plate retracts and the lower groove portion of the engagement groove is engaged with the engagement pin, whereby the drive mechanism is driven. Moves downwards and is separated from the disc on the tray, and immediately before the separation, the drive switching plate is moved forward to advance the tray slightly so that the tray side rack is engaged with the drive pinion, and the drive pinion is directly moved. The tray can be advanced by rolling.

Further, the tray is retracted by reversing the drive pinion from the advanced state of the tray, and the drive switching plate is moved back immediately before the end of the retract, whereby the slide plate is slightly advanced to slide the slide plate. The side rack is engaged with the drive pinion, and the reverse movement of the drive pinion advances the slide plate to raise the drive mechanism to engage the disc on the tray.

[0005]

SUMMARY OF THE INVENTION In the above conventional configuration,
A pair of left and right slide plates and drive switching plates for raising and lowering the drive mechanism are scattered on the left and right sides and front of the drive mechanism, and the structure is complicated, the number of parts is large, the manufacturing cost is high, and the size is small. It is an obstacle to

In view of the above-mentioned conventional drawbacks, it is an object of the present invention to provide a disc player having a simple structure, a small number of parts, a low manufacturing cost and a compact size.

[0007]

In order to achieve the above object, the invention according to claim 1 is such that a tray for supporting a disk is disposed in a casing so as to be able to move forward and backward, and the tray is provided in the casing. In a disc player provided with a drive mechanism for reading information recorded on a disc placed on the disc, the drive mechanism swings up and down around its rear part to engage with the disc on the tray. It is configured to be capable of changing its posture between a horizontal posture and an inclined posture separated from the disc on the tray. The drive mechanism is changed from the horizontal posture to the inclined posture prior to the start of the forward movement of the tray, and the tray is retracted. A cam mechanism for changing from a tilted posture to a horizontal posture after the end of the operation is provided between the front portion of the drive mechanism and the casing. That.

According to a second aspect of the present invention, in the drive mechanism according to the first aspect, a front portion and a rear portion of the drive mechanism are connected to a casing and a cam mechanism via elastic bodies to drive the cam mechanism. Thus, the elastic body on the rear side is configured to swing up and down.

The invention described in claim 3 is the first or second invention.
In any of the inventions described above, the cam mechanism has a cam rod capable of reciprocating along a direction orthogonal to the moving direction of the tray, and the cam rod has an upper groove portion and a lower groove portion along the moving direction. And a rear end of a lift arm pivotally supported by a casing so as to be rotatable about a pivot shaft, is connected to a front portion of the drive mechanism, and a tip of the lift arm is formed. The cam floor formed in the section is engaged with the cam groove, and by moving the cam rod forward to engage the lower groove section of the cam groove with the cam floor, the drive mechanism is held in a horizontal posture via the lift arm. The drive mechanism is configured to be held in an inclined posture through the lift arm by moving the cam rod back and engaging the upper groove portion of the cam groove with the cam floor. It is characterized in.

According to a fourth aspect of the present invention, in the third aspect of the present invention, a rack is formed on the cam rod along its longitudinal direction, and a rack is formed on the tray along its moving direction. A drive pinion that selectively engages with both racks is provided, and the tray is slightly advanced just before the cam rod is returned by the forward rotation of the drive pinion to separate the cam rod side rack from the drive pinion, and the tray side rack is While engaging with the drive pinion,
A drive switching mechanism is provided between the cam rod and the tray to move the cam rod slightly forward just before separating the tray rack from the drive pinion by retracting the tray by reversing the drive pinion and engaging the cam rod rack with the drive pinion. It is characterized by

According to a fifth aspect of the present invention, in the invention according to the fourth aspect, the drive switching mechanism is provided with a switching pin protruding from the cam rod, and the tray facing the switching pin and slightly outside the tray in the forward direction. It is characterized in that it is configured by a switching plate that is inclined and projects.

According to a sixth aspect of the present invention, in the fifth aspect of the invention, the substantially U-shaped engaging frame into which the switching pin is fitted by the forward movement of the cam rod is in a direction orthogonal to the moving direction of the tray. It is characterized in that it is continuously provided along the switching plate.

[0013]

According to the present invention, in the retracted state of the tray, the cam mechanism holds the drive mechanism in a horizontal position to engage the drive mechanism with the disk on the tray. By driving the mechanism, the drive mechanism descends around the rear part thereof to assume an inclined posture, the drive mechanism is separated from the disc on the tray, and the tray can be advanced.

Further, when the tray in the forward state is retracted,
After the retreat operation is completed, the cam mechanism causes the drive mechanism to rise about the rear part thereof and become horizontal, and the drive mechanism is engaged with the disc on the tray to read the information recorded on the disc. It becomes possible to

In this case, the cam mechanism for changing the posture of the drive mechanism is centrally provided between the front portion of the drive mechanism and the casing, and the one equivalent to the conventional drive switching plate is unnecessary. Therefore, the structure is simple, the number of parts is small, the manufacturing cost is low, and the size can be reduced.

According to the second aspect of the invention, the elastic body is used as a member for connecting the drive mechanism to the casing and the cam mechanism, and the connecting structure is simple and the material cost is low, and the elastic body vibrates. Can be absorbed to hold the drive mechanism stationary, and the information recorded on the disc can be read reliably.

According to the third aspect of the present invention, the drive mechanism can be reliably swung up and down via the lift arm simply by reciprocating the cam rod of the cam mechanism.
The structure is simple and difficult to break down.

According to the fourth aspect of the invention, the drive switching mechanism provided between the cam rod and the tray allows the cam rod side rack and the tray side rack to be selectively engaged with the drive pinion. The tray can be automatically moved in and out and the drive mechanism can be vertically swung with only one drive source.

According to the fifth aspect of the present invention, the drive switching mechanism includes a switching pin projecting from the cam rod and a switching plate projecting from the tray, and the structure thereof is simple and difficult to break down.

According to the sixth aspect of the present invention, a substantially U-shaped engaging frame is continuously provided on the switching plate along a direction orthogonal to the moving direction of the tray, and the engaging frame is provided with the above-mentioned engaging frame. The fitting of the switching pin allows the disc on the tray to be accurately positioned with respect to the drive mechanism and also to be locked against accidental withdrawal of the tray forward.

[0021]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 8 shows a disc player which is an embodiment of the present invention, in which a tray 1 supporting a compact disc (hereinafter, referred to as a disc) D called a CD is extended in a front-back direction in a casing 2. It is arranged to be retractable,
As shown in FIGS. 1 and 2, a drive mechanism 3 for reading information recorded on the disc D on the tray 1 and a cam for changing the posture of the drive mechanism 3 are provided in the casing 2. Mechanism 4 is provided.

As shown in FIG. 3, the tray 1 is integrally formed with a tray body 1a having a circular recess-shaped disc mounting portion 6 for positioning the disc D, and along both side edges of the tray body. Has a guide rail portion 1b,
The guide rail portion 1b is supported by the casing 2 and is configured to be able to move back and forth only in the front-rear direction. Reference numeral 7 is a through hole penetrating the central portion of the tray 1a, and the drive mechanism 3 is engaged with the disk D through the through hole 7.

As shown in FIGS. 4 and 5, the drive mechanism 3 includes a support frame 10 and a turntable 12 fixed to a drive shaft of a spindle motor 11 arranged in the front portion of the support frame 10. By rotating the optical pickup 13 arranged in the central through hole 10a of the support frame 10 and the screw shaft 14 screwed to the nut portion 13a provided in the optical pickup 13 in the forward and reverse directions, the optical pickup 13 is moved to the disc D. And a slide motor 15 for moving along the radial direction of the tray 1. As shown in FIG. 5, the support frame 10 is placed in a horizontal state to slightly lift the disc D on the tray 1 by the turntable 12. , A erection frame 1 erected in a transverse direction on a casing 2 via the disk D
6 (see FIG. 8) lifts a disc holder 17 supported so as to be movable up and down, holds the disc D between the disc holder 17 and the turntable 12, and then moves the optical pickup 13 to move the disc D to the disc D. The recorded information can be read.

As shown in FIGS. 1 and 2, the cam mechanism 4 has a cam rod 18 and a lift arm 20, and the cam rod 18 is provided with a plurality of cam rods that penetrate the cam rod 18 along its length. The elongated hole 18a is engaged with the guide pin 19 protruding from the casing 2 so that the elongated hole 18a can reciprocate along the direction orthogonal to the moving direction of the tray 1, and the drive mechanism 3 of the cam rod 18 can be moved. A cam groove 21 having an upper groove portion 21a and a lower groove portion 21b is formed on the opposite side surfaces along the moving direction thereof, and the lift arm 20 is formed in a substantially U shape in a plan view and protrudes on both side surfaces thereof. A cam floor 23, which is swingably supported by the casing 2 via the pivot shafts 22 and 22 and projects forward from the lift arm 20, is engaged with the cam groove 21.

Further, as shown in FIG. 2, the upper end annular grooves 24a of the four cylindrical elastic bodies 24 made of rubber or the like are engaged with the engaging recesses 10b formed at the four corners of the support frame 10, and each of them is engaged. By engaging the lower end annular groove 24b of the elastic body 24 with the engaging recesses 2a formed at the rear portion of the casing 2 and the engaging recesses 20a formed at both ends of the lift arm 20, the drive mechanism 3 causes each elastic body 24 to move. It is connected to the casing 2 and the lift arm 20 via.

As shown in FIG. 1, when the cam rod 18 is moved forward a, the cam floor 23 engages with the lower groove portion 21b of the cam groove 21 and the drive mechanism 3 is held in a horizontal posture (FIG. 5). ), From this state, the cam rod 18
When the cam is moved back in b, the cam floor 23
1, the lift arm 20 pivots downward about the pivot shafts 22, 22, and the drive mechanism 3 moves downward about the rear elastic body 24 to assume an inclined posture. Then, the turntable 12 is separated from the disc D (see FIGS. 6 and 7).

According to the above structure, the cam mechanism 4 for changing the posture of the drive mechanism 3 is centrally provided between the front portion of the drive mechanism 3 and the casing 2, and the conventional drive switching plate is provided. Since no equivalent is required, the structure is simple, the number of parts is small, the manufacturing cost is low, and the size can be reduced. Further, the elastic body 24 is used as a member for connecting the drive mechanism 3 to the casing 2 and the lift arm 20, and the connecting structure is simple and the material cost is low, and the elastic body 24 absorbs vibration to drive the drive mechanism. The information recorded on the disc D can be reliably read by holding the No. 3 stationary. Further, the lift arm 20 can be simply moved by reciprocating the cam rod 18.
The drive mechanism 3 can be reliably rocked up and down via the, and the structure is simple and is unlikely to fail.

As shown in FIG. 1, a rack 26 is formed at one end of the cam rod 18 along the longitudinal direction thereof, and a rack 27 is formed on the back surface of the tray 1 along the moving direction thereof. (See FIG. 3), both racks 2
A small-diameter drive pinion 28 and a large-diameter drive pinion 29, which are selectively engaged with each other as 6, 6 and 27, are integrally formed concentrically.

The two drive pinions 28, 29 are rotated in the forward and reverse directions by a drive motor 31 via an interlocking connecting mechanism composed of pulleys 32, 33, a belt 34, a small gear 35 and a large gear 36. . The diameters of both drive pinions 28 and 29 may be the same, but by making the diameters different as in this embodiment, the tray 1 can be quickly moved in and out, and the drive mechanism 3 can be gently moved up and down. Swing to turntable 12 and disk D
It is possible to smoothly engage and disengage with.

As shown in FIG. 1, a switching pin 38a provided on the other end of the cam rod 18 and a rear surface of the tray 1 facing the switching pin 38a and slightly inclined outward in the forward direction. A drive switching mechanism 38 including a switching plate 38b (see FIG. 3) protrudingly provided is provided.

In the above structure, as shown in FIG. 1, both drive pinions 28 and 29 are moved from the retracted state of the tray 1.
Immediately before the cam rod 18 is moved backward b by the forward rotation c of the cam rod side to separate the cam rod side rack 26 from the small diameter drive pinion 28, the switching pin 38a presses the switching plate 38b (see FIG. 6). The tray side rack 27 can be engaged with the large-diameter drive pinion 29 by slightly advancing, and the tray 1 is advanced (FIG. 11).
From the reference), the reverse d of both drive pinions 28, 29
Immediately before retracting the tray 1 to separate the tray-side rack 27 from the large-diameter drive pinion 29, the switching plate 38b presses the switching pin 38a (see FIG. 6), thereby slightly moving the cam rod 18 forward a. Cam rod side rack 26
Can be engaged with the small diameter drive pinion 28.

As shown in FIG. 3, a substantially U-shaped engaging frame 40 into which the switching pin 38a is fitted on the back surface of the tray 1 by the forward movement a of the cam rod 18 is orthogonal to the moving direction of the tray 1. Are continuously provided along with the engaging frame 40.
The disc D on the tray 1 can be accurately positioned with respect to the turntable 12 by fitting the switching pin 38a into the disk (see FIG. 1), and the tray 1 is prevented from being pulled out accidentally forward. Can be locked.

In FIG. 1, reference numeral 42 denotes a tray advancing stop limit switch provided in the casing 2. The limit switch 42 is actuated when the projection 43 provided at the rear end of the tray 1 comes into contact with the drive motor 31. Driving is stopped.

The operation procedure will be described. First, as shown in FIG. 9, when the tray 1 is in the retracted state, the lower groove portion 21b of the cam groove 21 engages with the cam floor 23 to drive the drive mechanism 3.
Is held in a horizontal position, the turntable 12 is engaged with the disk D (see FIGS. 4 and 5), and by pushing a tray operation button (not shown) from this state, both drive pinions 28, 29 are moved. Forward rotation c, small diameter drive pinion 28
The cam rod 18 is moved back by the engagement of the cam rod side rack 26 with the cam rod side rack 26, the upper groove portion 21a of the cam groove 21 engages with the cam floor 23, and the lift arm 20 moves to the pivot shaft 2.
2, 22 is rotated downward, and in conjunction with this, the drive mechanism 3 is lowered about the rear elastic body 24 to be in an inclined posture, and the turntable 12 is separated from the disc D (see FIG. 7). .

As shown in FIG. 10, the switching pin 38a presses the switching plate 38b (see FIG. 6) immediately before the cam rod side rack 26 is moved back and separated from the small diameter drive pinion 28 (see FIG. 6). Move it slightly forward and move the tray side rack 2
7 is engaged with the large-diameter drive pinion 29. Then, the forward rotation c of both drive pinions 28 and 29 causes the tray 1 to move forward as shown in FIG.

Then, immediately before the end of the forward movement of the tray 1,
The protrusion 43 provided on the tray 1 is the limit switch 42.
, The drive signal of the limit switch 42 is stopped, the drive of the drive motor 31 is stopped, the advance of the tray 1 is stopped, and the disc D can be removed from the tray 1.

Next, when the tray operation button is pushed, the two drive pinions 28, 29 are first reversed in the reverse order of the above procedure, and the large-diameter drive pinion 29 and the tray side rack 27 are meshed with each other so that the tray 1, the switching plate 38b presses the switching pin 38a, and the cam rod 18 is slightly moved forward a to cause the cam rod side rack 26 to mesh with the small-diameter drive pinion 28 immediately before the end of the backward movement. Subsequently, the cam rod 18 moves forward a due to the reverse rotation d of the two drive pinions 28 and 29, and the lower groove portion 21 b of the cam groove 21 moves to the cam floor 23.
And the drive mechanism 3 is returned to the horizontal posture (see FIG. 5).

[0038]

According to the invention described in claim 1, since the cam mechanism for changing the posture of the drive mechanism is centrally provided between the front portion of the drive mechanism and the casing, the structure is improved. It is simple, has a small number of parts, is cheap to manufacture, and can be miniaturized.

According to the second aspect of the invention, the elastic body is used as a member for connecting the drive mechanism to the casing and the cam mechanism. The connecting structure is simple and the material cost is low, and the elastic body vibrates. Can be absorbed to hold the drive mechanism stationary, and the information recorded on the disc can be read reliably.

According to the third aspect of the invention, the drive mechanism can be reliably swung up and down via the lift arm simply by reciprocating the cam rod of the cam mechanism.
The structure is simple and difficult to break down.

According to the fourth aspect of the invention, the tray can be automatically moved in and out and the drive mechanism can be vertically swung with only one drive source.

According to the fifth aspect of the present invention, the drive switching mechanism is composed of a switching pin projecting from the cam rod and a switching plate projecting from the tray, and the structure thereof is simple and difficult to break down.

According to the sixth aspect of the invention, the disc on the tray can be accurately positioned with respect to the drive mechanism by inserting the switching pin into the substantially U-shaped engaging frame, and the tray can be accurately positioned. Can be locked to prevent it from being accidentally pulled forward.

[Brief description of drawings]

FIG. 1 is a partially cutaway plan view of a disc player according to an embodiment of the present invention.

FIG. 2 is an exploded perspective view of the main part.

FIG. 3 is a plan view of the tray.

FIG. 4 is a cross-sectional view of the drive mechanism in a horizontal posture.

FIG. 5 is a vertical cross-sectional view of the same state.

FIG. 6 is a plan view of a main part of the drive mechanism in a tilted posture state.

FIG. 7 is a vertical cross-sectional view of the same state.

FIG. 8 is a schematic perspective view of the disc player.

FIG. 9 is a schematic plan view showing a front stage of the tray advancing operation.

FIG. 10 is a schematic plan view showing the middle stage of the same operation.

FIG. 11 is a schematic plan view showing the latter stage of the same operation.

[Explanation of symbols]

 1 Tray 2 Casing 3 Drive Mechanism 4 Cam Mechanism 18 Cam Rod 20 Lift Arm 21 Cam Groove 21a Cam Groove Upper Groove 21b Cam Groove Lower Groove 22 Pivot Shaft 23 Cam Floor 24 Elastic Body 26 Cam Rod Side Rack 27 Tray Side Rack 28 Small Diameter Drive pinion 29 Large diameter drive pinion 38 Drive switching mechanism 38a Switching pin 38b Switching plate 40 Engaging frame D Disk a Forward b Reversed c Forward d Reversed

Claims (6)

[Claims] 1. A drive mechanism for arranging a disc supporting tray in a casing so that the disc supporting tray can move forward and backward, and for reading information recorded on a disc placed on the tray in the casing. In the disc player in which the drive mechanism is arranged, the drive mechanism is capable of changing its posture between a horizontal posture in which the drive mechanism swings up and down around the rear part to engage with the disc on the tray and an inclined posture in which the disc is separated from the disc on the tray. And a cam mechanism for changing the drive mechanism from the horizontal posture to the inclined posture before starting the forward movement of the tray and changing the inclined posture from the horizontal posture after the backward movement of the tray is in front of the drive mechanism. A disc player characterized by being provided between a section and a casing. 2. A front portion and a rear portion of the drive mechanism are connected to a casing and a cam mechanism via an elastic body,
2. The disc player according to claim 1, wherein the disc player is configured to swing up and down about the elastic body on the rear side by driving the cam mechanism. 3. The cam mechanism has a cam rod capable of reciprocating along a direction orthogonal to the moving direction of the tray, and the cam rod is provided with an upper groove portion and a lower groove portion along the moving direction. A rear end of a lift arm, which has a groove formed therein and is pivotally supported by a casing so as to be rotatable about a pivot shaft, is connected to a front portion of the drive mechanism, and a cam formed at a front end of the lift arm. The floor is engaged with the cam groove and the cam rod is moved forward to engage the lower groove portion of the cam groove with the cam floor, whereby the drive mechanism is held in a horizontal position via the lift arm and the cam rod is returned to the original position. The drive mechanism is configured to be held in an inclined posture via a lift arm by moving the cam groove to engage the upper groove portion of the cam groove with the cam floor. Or the disc player described in any one of 2. 4. A rack is formed along the longitudinal direction of the cam rod, a rack is formed along the moving direction of the tray, and a drive pinion that selectively engages with both racks is provided. Immediately before separating the cam rod side rack from the drive pinion by returning the cam rod by the forward rotation of the drive pinion, the tray is slightly advanced to mesh the tray side rack with the drive pinion, and the tray is rotated by the reverse rotation of the drive pinion. A drive switching mechanism is provided between the cam rod and the tray for moving the cam rod slightly forward and engaging the cam rod side rack with the drive pinion just before retracting and separating the tray side rack from the drive pinion. The disc player according to claim 3. 5. The drive switching mechanism comprises a switching pin projecting from the cam rod, and a switching plate facing the switching pin and projecting on the tray with a slight outward inclination toward the forward direction. The disc player according to claim 4, wherein 6. A substantially U-shaped engaging frame into which the switching pin is fitted by the forward movement of the cam rod is continuously provided to the switching plate along a direction orthogonal to the moving direction of the tray. The disc player according to claim 5.