JPH0612694A - Optical disk player - Google Patents

Abstract

PURPOSE:To clean an objective lens without requiring a specific driving means and a stand-by time by moving a cleaning member with a shutter opening means integrally whenever an optical disk cassette is loaded and taken out. CONSTITUTION:The inserted optical disk cassette 1 is held by a holder 24, and a shutter 11 is moved to an opening position by an opening lever 25 (25') and opening parts 5, 5' are opened. Further, the holder 24 is moved downward and the cassette 1 is loaded on a reproducing part, and an optical disk 16 is loaded on a turntable 22, and a signal is read by the rotation of the table 22 and the irradiation of the disk 16 with a laser beam from an optical pickup device 23. The cleaning member 28 is attached to the bottom surface of the tip part of the lever 25, and when the shutter 11 is opened by the lever 25, the member 28 comes into contact with the light outgoing surface 27a of the objective lens 27 in the device 23 and thus, the light outgoing surface 27a is cleaned.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a novel optical disc player, and more particularly to a cassette case in which an optical disc is housed, which has an opening for exposing a part of the optical disc to the outside. While using an optical disc cassette equipped with a shutter to open and close
The present invention relates to an optical disc player having a turntable to which an optical disc is detachably mounted and an optical pickup for irradiating the optical disc with a laser beam, and more particularly to an optical disc player provided with shutter opening means for opening a shutter of an optical disc cassette. It is an object of the present invention to provide a novel optical disc player capable of cleaning the objective lens of an optical pickup by utilizing the movement of the shutter opening means.

[0002]

2. Description of the Related Art In reading a signal recorded on an optical disk such as a so-called compact disk or laser disk, generally, an optical pickup equipped with a laser light source irradiates a laser beam on the recording surface of the optical disk and the laser beam This is performed by detecting the return light reflected on the recording surface.

Then, the laser beam emitted from the laser light source is focused by an objective lens located at a portion facing the optical disc of the optical pickup, so that a spot having a predetermined diameter of a micron unit is formed on the recording surface of the optical disc. The light is collected, and the content of each signal is detected by detecting the difference in the amount of return light.

Therefore, if dust is attached to the light exit surface of the objective lens of the optical pickup, the light control function for the laser beam such as the directivity or the converging property of the laser beam emitted from the objective lens is impaired, or the dust causes it. The amount of light to be irregularly reflected and applied to the recording surface of the optical disc becomes insufficient, and further, the light control function for the returning light is impaired, and an error may easily occur in signal reading.

Particularly, in an optical disc player placed in a dusty environment, for example, a vehicle-mounted optical disc player, dust is highly likely to adhere to the objective lens thereof, so that an error in reading a signal may occur. It will happen a lot.

Therefore, the light exit surface of the objective lens of the optical pickup must be kept clean at all times.
For that purpose, the light emitting surface may be cleaned by wiping it at any time. However, since the internal structure of the optical disc player, in particular, the structure of the optical pickup has an extremely sophisticated mechanism, the general user can use the optical pickup. It is not preferable to touch the above, and even if it is so, it is troublesome to ask a professional engineer to clean it.

Therefore, some optical disc players are provided with a cleaning means for cleaning the objective lens.

For example, the optical disk is detachably mounted, and a part of the optical disk is located above the optical pickup, and a substantially horizontal position is provided between a retracted position and a retracted position where the optical disk is mounted and removed. In an optical disc player having a moving disc mounting table, an appropriate cleaning member is attached to the disc mounting table, and when the disc mounting table moves, the cleaning member serves as a light emitting surface of an objective lens of an optical pickup. There is a type in which the objective lens comes into contact with the cleaning member by contact or by moving the optical pickup so that the light emitting surface of the objective lens is cleaned.

An optical disk player provided with a cleaning means having such a cleaning member is disclosed in Japanese Utility Model Laid-Open No. 60-173133.

[0010]

According to the above-mentioned cleaning means, since the objective lens is cleaned by moving the disk mounting table or the optical pickup, a special driving means for driving the cleaning member is required. There is an advantage of not doing.

However, such cleaning means,
In particular, in the case where the cleaning member comes into contact with the light emitting surface of the objective lens when the disk mounting table moves, when the disk mounting table comes to the retracted position, the cleaning member moves at least when the optical pickup reads the signal. Since the cleaning member has to be located outside, it is usually necessary that the cleaning member be provided so as to project in the retracting direction from one end of the disc mounting table in the retracting direction. There is a problem that the size of the disk mounting table becomes large.

Further, in the case of moving the optical pickup to bring the cleaning member into contact with the objective lens, it is necessary to set the moving range of the optical pickup to be considerably larger than the moving range at the time of signal reading. There is a problem that the guide means becomes large, and the cleaning timing is usually
Since it is programmed to be performed before the signal reading is started or when the optical disc is ejected, there is a problem that it takes time to start the signal reading or the optical disc ejecting operation.

By the way, among optical discs, those having a high signal recording density are used as they are in the state of being housed in some relatively hard cassette case. The cassette case of the disk cassette is usually provided with an opening for exposing a part of the optical disk to the outside of the cassette case and a shutter for opening and closing the opening.

The shutter is generally locked so that the opening is not opened carelessly when the optical disc cassette is not used, so that the optical disc cassette can be used as an optical disc player. When mounted, it is moved to a position where the opening is opened.

Therefore, an optical disc player using an optical disc cassette equipped with such a shutter is provided with some shutter opening means for opening the shutter, and this shutter opening means is provided in the optical disc cassette. The optical disc player is operated every time it is loaded and unloaded.

[0016]

In view of the above-mentioned problems, the optical disc player of the present invention, in order to solve the above problems, exposes a part of the optical disc to the outside in a cassette case in which the optical disc is housed. An optical disc cassette provided with an opening for opening and a shutter for opening and closing the opening is used, and a turntable on which the optical disc is detachably mounted and an optical disc are irradiated with a laser beam. In an optical disc player including an optical pickup and a shutter opening means for opening the shutter, the optical disc player is attached to the shutter opening means and moves integrally with the shutter opening means, and at the time of the movement, the objective lens of the optical pickup is moved. A cleaning member for wiping the light emitting surface is provided.

[0017]

Therefore, according to the optical disc player of the present invention, the cleaning member moves integrally with the shutter opening means each time the optical disc cassette is loaded and unloaded, so that the optical disc is loaded and unloaded. In this case, the light output surface of the objective lens of the optical pickup must be cleaned without any special driving means for moving the cleaning member, and further, the optical pickup need not be moved. Also, the objective lens can be cleaned without providing such a waiting time for cleaning.

[0018]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The details of the optical disc player of the present invention will be described below with reference to the embodiments shown in the accompanying drawings.

First, an example of an optical disc cassette used in the optical disc player will be described, and then the optical disc player will be described.

Reference numeral 1 is an optical disc cassette.

Reference numeral 2 is a cassette case of the optical disk cassette 1, and the cassette case 2 is a relatively thin substantially rectangular box formed by integrally joining two flat case halves 3 and 4 made of synthetic resin. The case halves 3 and 4 have openings 5, 5'formed in the main portions 3a, 4a of the case halves 3 and 4, and the openings 5, 5'are formed at one end in the longitudinal direction from the central portion (see FIG. 1) in the direction shown in FIG.
a and 4a, each of which has a substantially circular turntable insertion portion 5a, 5'a and an objective lens facing portion 5b, 5'b having a substantially rectangular shape.

Then, including the openings 5, 5'on the outer surfaces of the case halves 3, 4 to a position closer to one side end in the width direction (lower side end in the direction shown in FIG. 1). Shallow shutter locating recesses 6 and 6'are formed in a portion between the two and substantially one end in the longitudinal direction.
Further, a concave portion 7 extending in a substantially groove shape along the width direction of the cassette case 2 is formed on one end surface in the longitudinal direction of the cassette case 2.

Most of 8 is one end of the recess 7 (see FIG. 1).
Is a lock element (see FIG. 1) located at the upper end in the direction shown in FIG. 1, and the lock element 8 is formed of a synthetic resin having a slightly elastic property. The part located on the back side is the cassette case 2
An engaging notch 9 is formed at a substantially central portion in the longitudinal direction of a flexible portion 8a which is fixed to the concave portion 7 and extends in a direction substantially parallel to the direction in which the concave portion 7 extends. Towards the back of the
Say ) Is held so that one side surface thereof is substantially positioned on the opening surface of the recessed portion 7 when not pressed.

Numerals 10 and 10 'are positioning holes formed at positions on both sides in the width direction of a portion of the cassette case 2 on the side opposite to the recess 7 on the side of the end face.

Reference numeral 11 denotes a shutter formed of a sheet metal material in a substantially U-shape, and two closing pieces 12, 12 'facing each other are formed in a plate shape larger than the openings 5, 5'. An engaging piece protruding toward the space between the closing pieces 12 and 12 'at one end (upper end in the direction shown in FIG. 1) of the intermediate piece 13 connecting the respective one edges of the closing pieces 12 and 12'. 14 (see FIG. 1) is formed in a cut-and-raised shape, and one side of the intermediate piece 13 extends to one of the two closing pieces 12, 12 ′ at a position close to the engaging piece 14 of the intermediate piece 13. The cutout portion 15 is formed.

The shutter 11 is slid in the width direction of the cassette case 2 with the two closing pieces 12 and 12 'thereof being positioned in the shutter disposing recesses 6 and 6'formed in the cassette case 2. It is movably supported and is moved by the elastic means (not shown) to the other end in the width direction of the cassette case 2, that is, the opening 5,
It is in a state in which the moving force in the closing direction of 5'is energized.

Therefore, when the shutter 11 is not pressed in the direction against the moving force, the closing piece 1 thereof is not pressed.
2, 12 'are held in a closed position for closing the openings 5, 5', and when the closed position is reached, the engagement piece 14 engages with the engagement notch 9 of the lock member 8 to close the opening. Prevented from moving from position, i.e. locked and
When the flexible portion 8a of the lock member 8 is pressed in the lock releasing direction, the lock is released, and when the flexible member 8a is pressed in a direction against the moving force from the released state, the opening 5 is opened. 5'is moved to the open position, which opens.

In the state where the shutter 11 is in the closed position, the notch 15 formed in the intermediate piece 13 is located so as to face the tip of the flexible portion 8a of the lock element 8.

Reference numeral 16 is an optical disk.

Reference numeral 17 denotes a disk portion of the optical disc 16,
Both sides 17a and 17b are recording surfaces.

Adsorption plates 18, 18 'made of a substantially disk-shaped magnetic material are fixed to the central portions of the recording surfaces 17a, 17b, and the adsorption plate 1 of the recording surfaces 17a, 17b is fixed.
A recording area is a portion between a position slightly separated from 8, 18 'and a position closer to the center of the distribution from the outer peripheral edge, and a recording track having a large number of pits arranged in this recording area is substantially spiral. Is formed in.

The optical disc 16 is housed in the cassette case 2 in a rotatable state, and the suction plates 18 and 18 'of the optical disc 16 are arranged in the opening portions 5 and 5'of the cassette case 2 and the turntable insertion portions 5a and 5', respectively. It is located so as to face ‘a’.

As the shutter 11 moves to the open position, part of the optical disc 16 is exposed to the outside of the cassette case 2.

Reference numeral 19 is an optical disc player using the above-mentioned optical disc cassette 1.

Reference numeral 20 denotes an outer casing of the optical disc player 19, and an elongated cassette insertion opening 21 is formed in the left-right direction at a position near the upper end of the front face of the outer casing 20.

The inside of the optical disc player 19 is roughly classified into a turntable 22 on which the optical disc 16 is detachably mounted, an optical pickup device 23 for reading a signal recorded on the optical disc 16, and a circuit (not shown). , A cassette holder 24 into which the optical disc cassette 1 is detachably loaded, and a shutter release lever 25 for moving the shutter 11 of the optical disc cassette 1 inserted into the cassette holder 24 to the open position. , 25 ', and a cassette loading section including an elevating mechanism 26 for moving the cassette holder 24 in the vertical direction.

Then, from the cassette insertion port 21 to the outer casing 20.
The optical disc cassette 1 inserted therein is inserted into the cassette holder 24 and held by the cassette holder 24,
Moreover, the shutter 11 is the shutter release lever 25.
Or 25 'is moved to the open position and the opening 5,
5'is opened, and the cassette holder 24 is moved downward from that state by the elevating mechanism 26 so that the optical disc cassette 1 is mounted on the reproducing portion, whereby the optical disc 16 is mounted on the turntable 22 and the optical disc is mounted. The objective lens 27 of the optical pickup device 23 is relatively closely opposed to the recording surface 17a or 17b of the disc 16 and the turntable 22 is rotated from this state so that the optical disc 16 is integrated with the recording surface 17a or 17b. The laser beam emitted from the optical pickup device 23 is radiated to the optical disc 16 through the objective lens 27 so that the signal on the optical disc 16 is read.

The two shutter release levers 25,
A cleaning member 28 is attached to the lower surface of the tip end of the one 25 on the left side of the shutter release lever 25 '.
5 opens the shutter 11 of the optical disc cassette 1, that is, a position indicated by a solid line in FIG. 1 (hereinafter referred to as “standby position”) and a position indicated by a two-dot chain line (hereinafter referred to as “opening completion position”). The cleaning member 28 comes into contact with the light exit surface 27a of the objective lens 27 of the optical pickup device 23 so as to wipe the light exit surface 27a, thereby cleaning the light exit surface 27a. It is supposed to be.

Reference numeral 29 denotes a mechanical chassis (only shown in FIGS. 3 and 4) of the reproducing section. The mechanical chassis 29 is fixed to the outer casing 20, and positioning pins are provided from both left and right ends of its front end. Numerals 30 and 30 'are projected upward, and a large opening 29a is formed.

Reference numeral 31 denotes a disk rotating motor fixed to the lower surface of the mechanical chassis 29, and its rotating shaft 31a is projected above the mechanical chassis 29 through the opening 29a, and the rotary table 31a is provided with a turntable. 22 is fixed.

The turntable 22 is formed in a substantially cylindrical shape having an open upper surface and is short in the axial direction, and a magnet 32 is attached to the inside thereof.

The optical pickup device 23 is an optical block 33 provided with a laser light source, optical parts and the like (not shown).
And a biaxial drive body 3 supported on the upper surface of the optical block 33.
The objective lens 27 is attached to the upper end portion of the biaxial driving body 34 with its optical axis extending in the vertical direction, and the laser beam emitted from the laser light source passes through a predetermined optical system. The light is emitted upward from the objective lens 27.

Reference numeral 35 is a guide shaft, and 36 is a screw shaft. The guide shaft 35 and the screw shaft 36 are provided below the mechanical chassis 29 so as to extend parallel to each other in the front-rear direction. With the upper end portion protruding upward from the mechanical chassis 29 through the opening 29a of the mechanical chassis 29, the guide shaft 35 and the screw shaft 36 are
It is supported so as to be movable in the front-rear direction along with, and is moved in the front-rear direction by rotating the screw shaft 36 by a motor (not shown).

The optical pickup device 23 is moved between a position shown by a solid line and a position shown by a two-dot chain line in FIG.
The length of this moving range is at least the width of the recording areas of the recording surfaces 17a and 17b of the optical disk 16, that is, the length along the radial direction from the center of the optical disk 16. There is.

Reference numeral 37 denotes a cassette loading portion chassis, which is formed in a substantially rectangular frame shape that is long in the front-rear direction when viewed from above.

That is, 38 and 38 'are side plates of the chassis 37, 39 is a rear plate connecting the rear end portions of the side plates 38 and 38', and 40 is an upper end portion of the front end portions of the side plates 38 and 38 '. The crosspiece 41 connected to each other is a front plate connecting the lower ends of the front end edges of the side plates 38 and 38 ', and most of the front plate 41 is formed in an inverted L shape when viewed from the side. As a result, the chassis 37 is formed in a substantially frame shape in which both upper and lower surfaces and most of the front surface are open.

The chassis 37 is the mechanical chassis 29.
It is fixed to.

Reference numerals 42 and 42 denote spring hooks protruding forward from the upper edge of the rear plate 39, which are separated from each other in the left-right direction.

Reference numerals 43, 44 and 43 ', 44' denote holder support arms that support the cassette holder 24 in a vertically movable manner. These four holder support arms 43, 4
4 and 43 ', 44' have a structure which is substantially symmetrical to each other, and the left two 43, 44 (in the drawing, the lower one of the left holder supporting arms 43, 44)
4, the holder support arm 44 is omitted.
Has the same shape as that of the lower holder support arm 44 'located on the lower side, and is located at the same height. ) Is supported on the inner surface of the left side plate 38 of the chassis 37, and the two right side 43 ', 44' are supported on the inner surface of the right side plate 38 'of the chassis 37.

Holder support arms 43, 44 and 43 ',
Each of 44 'is formed in a laterally elongated plate shape having substantially the same length, and the front end portions of the upper two 43, 43' are located on the portions of the side plates 38, 38 'of the chassis 37 near the front end. It is rotatably supported by shafts 45, 45 'at a position close to the edge, and the rear ends of the lower two 44, 44' are side plates 3.
8, 38 'near the lower edge of the rear end of the shaft 38
6, 46 '(the shaft 46 on the left side is not shown) is rotatably supported, and the upper holder support arms 43, 43' and the lower holder support arms 44, 44 'are supported.
The respective substantially middle portions of the pins are pins 48, 49 and 48 ', 49' at the upper and lower ends of the connecting pieces 47, 47 '(the pin 49 provided at the lower end of the left connecting plate 47 is not shown). It is rotatably connected by.

Therefore, these holder support arms 43, 4
4 and 43 ', 44' are supported by the chassis 37 so as to be rotatable in a substantially vertical direction, and the respective rotating ends are vertically displaced in synchronization with each other.

Reference numeral 50 denotes a connecting plate. The connecting plate 50 is formed in an elongated plate shape in the left-right direction and is positioned so as to substantially contact the inner surface of the lower piece 41a of the front plate 41 of the chassis 37. The left and right ends thereof are fixed to the front ends of the lower holder support arms 44, 44 ', and the engaging long holes 51, 51 extending in the left-right direction at two positions separated from each other in the left-right direction (see FIG. 5). ) Has been formed.

The cassette holder 24 is provided with a substantially rectangular top plate 52, which is slightly smaller than the size of the chassis 37 in plan view, and side walls 53, 53 'projecting downward from the left and right side edges of the top plate 52. The bottom pieces 54, 5 are formed in a generally long shape in the left-right direction when viewed, and are cut off at several points in the longitudinal direction from the lower edges of the side walls 53, 53 '.
4'projects toward the sides facing each other, and the distance between the bottom pieces 54, 54 'and the top plate 52 is substantially equal to the thickness of the optical disc cassette 1.

Further, rising pieces 54a and 54'a are formed at the rear end portions of the bottom pieces 54 and 54 '.

Then, projecting pieces 55, 55 'project upward from the upper edge of the rear end portions of the side walls 53, 53', and projecting pieces 56, 56 '(left side) from the position near the front end of the lower edge. (The wall projection 56 is not shown) is projected downward, and the upper ends of the rear projections 55 and 55 'are pivoted ends of the upper holder support arms 43 and 43'. Pin 5 on the part
7 and 57 'are rotatably connected to each other, and the front projection 5
The lower end portions of the reference numerals 6, 56 ′ are lower holder support arms 44, 4
Pins 58, 58 '(the left one 58 is not shown) are rotatably connected to the rotating end of 4'.

Therefore, the cassette holder 24 is movably supported in the vertical direction by the chassis 37 via the holder supporting arms 43, 44 and 43 ', 44', and the vertical movement is always horizontal. It will be done with the posture maintained.

Numerals 59 and 59 are tension springs. The tension springs 59 and 59 are provided on the rear plate 39 of the chassis 37 and the spring hook pieces 42 and 42 and the cassette holder 2.
4 is stretched between the rear end of the top plate 52 and the cassette holder 24, and the cassette holder 24 is constantly urged by an upward movement force by the tension force of the tension springs 59, 59.

The vertical movement of the cassette holder 24 is carried out by the elevating mechanism 26, and as shown in FIG. 3, the eject position located at substantially the same height as the cassette insertion opening 21 of the outer casing 20 and FIG. As shown in the figure, it is moved to a loading completion position slightly lower than the eject position.

Reference numeral 60 denotes a large opening formed in the top plate 52, and 61 and 61 ′, spring hooks raised from positions close to the left and right of the top plate 52 near the rear end of the opening 60. Reference numeral 62 denotes an abutting stopper which projects from the rear end portion of the lower surface of the top plate 52 toward the front in a substantially L shape, and a front end portion 62a of the abutting stopper 62 is bent upward at a substantially right angle.

The shutter release levers 25 and 25 'have a structure which is substantially symmetrical.

That is, 63 and 63 'are main parts of the shutter release levers 25 and 25', and the main parts 63 and 63 'are formed in an elongated plate shape in a substantially front-rear direction as viewed from above and have their longitudinal sides. The substantially middle portion in the direction is bent into a substantially crank shape when viewed from the side, so that the main portion 63 of the shutter release lever 25 on the left side is positioned so that the portion from the middle portion to the front side is slightly lower than the other portions and the right side. The main portion 63 'of the shutter release lever 25' is formed such that the front portion from the middle portion thereof is positioned higher than the other portions by the same height as the cassette holder 24.

It should be noted that the length of the portion of the main portion 63 of the left shutter release lever 25 from the middle portion to the front side is smaller than the length of the portion from the middle portion of the main portion 63 'of the right shutter release lever 25' to the front side. It's getting longer.

Then, the shutter release lever 25 on the left side
A pin 64 is provided so as to project upward from a position near the front end of the main portion 63 of the main part 63, and the shutter release lever 25 'on the right side is provided.
Pins 64 'project downward from the front end of the main portion 63' of the roller 63, and the pressing roller 6 is attached to these pins 64, 64 '.
5, 65 'are rotatably supported.

Further, from the rear end portions of the side edges of the main portions 63, 63 'facing each other, the supported pieces 66, 66' which are substantially inverted L-shaped when viewed in the longitudinal direction of the main portions 63, 63 'are folded. It is formed in a curved shape, and the upper piece of the supported pieces 66, 66 'and the main portion 6 are formed.
Insertion holes 67, 6 are formed in the portions of the upper 63, 63 'facing the upper pieces.
7 are formed.

Reference numerals 68 and 68 'denote the supported pieces 66 and 66'.
Are projecting pieces projecting inwardly from the rear edge of the lower piece, and the projecting pieces 68, 68 'are shutter release levers 2
5, 25 'are formed in a substantially L shape when viewed from the side, and the upper end portion extends to a position slightly higher than the top plate 52 of the cassette holder 24, and the spring hook portion 68 is provided on this upper end portion.
a and 68'a are formed.

Reference numerals 69 and 69 'denote stopper pieces protruding from a position near the rear end of the other side edge of the main portion 63 in a direction substantially orthogonal to the extending direction of the main portion 63.

Reference numerals 70 and 70 'denote support shafts projecting downward from the left and right end portions of the rear end portion of the top plate 52 of the cassette holder 24, and the shutter release levers 25 and 25' are
The support shafts 70, 7 are inserted into the insertion holes 67, 67 ,.
The rear end portion is rotatably supported by the rear end portion of the cassette holder 24 by inserting 0 '.

Reference numerals 71 and 71 'are tension springs, and the tension springs 71 and 71' are shutter release levers 2.
5, 25 'of the spring hook portions 68a, 68'a and the spring hook piece 61 formed on the top plate 52 of the cassette holder 25,
It is stretched between 61 '.

Therefore, the shutter release lever 25 on the left side
Since the spring hook portion 68a is located on the right side of the support shaft 70, the tension force of the tension spring 71 causes
The urging force in the clockwise direction in FIG. 1 is constantly urged, and the shutter release lever 25 'on the right side has a spring hook portion 68'a located on the left side of the support shaft 70'. The pulling force of 71 'constantly urges the turning force in the counterclockwise direction in FIG. 1, and the shutter release lever 25 on the left side is applied with a pressing force for rotating it in the counterclockwise direction. When the stopper piece 69 is absent, the stopper piece 69 comes into contact with the lower end of the rear end portion of the left side wall 53 of the cassette holder 24 to prevent the stopper piece 69 from further rotating in the clockwise direction. The stopper piece 69 'comes into contact with the lower end of the rear end portion of the right side wall 53' of the cassette holder 24 in a state in which the pressing force for rotating the cassette in the clockwise direction is not applied. It is prevented from being further rotated counterclockwise.

Then, the shutter release lever 2 on the left side
5 is in the state where it is not pressed in the counterclockwise direction,
As shown by the solid line in FIG. 2, the pressing roller 65 is located at a position closer to the left than the center at a substantially middle portion in the front-rear direction of the cassette holder 24 (hereinafter, referred to as a “standby position” for the left shutter release lever 25). .) And the right shutter release lever 25 'is not pressed in the clockwise direction, as shown by the solid line in the figure, the pressing roller 65' has a substantially middle portion in the front-rear direction of the cassette holder 24. At the position closer to the right than the center (hereinafter, referred to as "standby position" for the right shutter release lever 25 ').

Then, the loading of the optical disc cassette 1 into the cassette holder 24 and the shutter release lever 2 are performed.
The movement of the shutter 11 to the open position by 5, 25 'is performed as follows.

The optical disk cassette 1 is inserted into the outer casing 20 with one end surface of the cassette case 2, that is, the surface on which the lock 8 is provided, facing rearward, and
The direction in the thickness direction is the direction in which the recording surface 17a faces downward when reading one recording surface 17a of the optical disk 16 (hereinafter referred to as "first direction"), and the direction of the optical disk 16 is set. When the other recording surface 17b is read, the direction is opposite to the first direction (hereinafter referred to as "second direction").

Therefore, when the optical disc cassette 1 is inserted into the outer casing 20 through the cassette insertion opening 21 while the cassette holder 24 is at the eject position,
When the optical disc cassette 1 is inserted into the cassette holder 24 and is half inserted, as shown by a solid line in FIG.
The pressing rollers 65 and 65 ′ of 5, 25 ′ are brought into relative contact with one end surface of the cassette case 2 of the optical disc cassette 1.

In this case, when the optical disc cassette 1 is inserted into the cassette holder 24 in the first direction, the pressing roller 6 of the shutter release lever 25 on the left side is pushed.
5 contacts the tip of the flexible portion 8a of the locker 8 through the notch 15 formed in the intermediate piece 13 of the shutter 11 to press the tip in the unlocking direction, and the optical disc cassette 1 Is in the second orientation and cassette holder 2
The shutter release lever 2 on the right side when inserted in 4
The 5'pressing roller 65 'comes into contact with the tip of the flexible portion 8a of the lock element 8 (in the state of FIG. 1) and presses the tip in the unlocking direction. The lock for the shutter 11 will be released.

Further, when the optical disc cassette 1 is further inserted from this state toward the back of the cassette holder 24, the cassette case 2 causes the left side pressing roller 65 to face rearward and obliquely rightward, and the right side. Since the pressing roller 65 'is pressed substantially rearward and obliquely leftward, the left shutter release lever 25 is rotated counterclockwise and the right shutter release lever 25' is rotated clockwise. At this time, since the pressing roller 65 or 65 ′ located in the cutout portion 15 of the shutter 11 moves while pressing the side edge of the cutout portion 15 toward the side, the shutter 11 is opened. It will be moved toward the position.

Then, as shown by the two-dot chain line in FIG.
Almost at the same time when the shutter 11 reaches the open position, the pressing rollers 65, 65 'are brought into contact with the front end portion 62a of the abutting stopper 62 provided on the cassette holder 24 to rotate the shutter opening levers 25, 25'. And the cassette case 2 causes the bottom pieces 54, 5 of the cassette holder 24 to
4'is brought into contact with the rising pieces 54a, 54'a, and in this state, the insertion of the optical disc cassette 1 into the cassette holder 24 is completed.

When the optical disc cassette 1 is inserted to a predetermined insertion completion position of the cassette holder 24, a lock mechanism (not shown) provided in the cassette holder 24 engages with a predetermined engaging portion of the cassette case 2. The optical disc cassette 1 is prevented from moving forward, and the optical disc cassette 1 is held by the cassette holder 24.

By the way, the shutter release lever 2 on the left side
As shown in FIG. 2, the tip of the main portion 63 of the optical pickup device 23 moves when the optical pickup device 5 moves between the standby position and the opening completion position.
The object lens 27 moves above the objective lens 27.
Then, the cleaning member 2 is attached to the lower surface of the tip portion.
8 is attached.

The cleaning member 28 is, for example, a relatively thick napped cloth or a substantially brush-like member formed by implanting soft fibers or the like on an appropriate flocking base. It is fixed by a fixing means such as adhesion.

The lower surface of the cleaning member 28 is positioned at substantially the same height as the light emitting surface 27a of the objective lens 27 of the optical pickup device 23, and when the shutter opening lever 25 moves, the optical pickup device 23 moves within the moving range. It has a size such that a part of it can come into contact with the objective lens 27 regardless of the position.

Therefore, the shutter release lever 25 on the left side
When moving, the cleaning member 28
Is moved, and while the shutter release lever 25 moves between the standby position and the opening completion position where the pressing roller 65 abuts the abutting stopper 62, the cleaning member 28 contacts the light emitting surface 27a of the objective lens 27. Are contacted with each other so that the light emitting surface 27a is cleaned.

Incidentally, the shutter release levers 25, 25 '.
Is moved from the standby position to the opening completion position when the optical disc cassette 1 is inserted into the cassette holder 24, and from the opening completion position to the standby position when the optical disc cassette 1 is taken out from the cassette holder 24. Since the optical disk cassette 1 is moved, the cleaning of the objective lens 27 by the cleaning member 28 is performed.
Is inserted both in the cassette holder and when it is taken out from the cassette holder 24.

Therefore, the light emitting surface 27a of the objective lens 27 is always cleaned by the cleaning member 28 every time the optical disc cassette 1 is inserted into and removed from the cassette holder 24, and this cleaning causes the light emitting surface 27a to be cleaned. The dust and the like adhering to 27a will be removed.

Reference numeral 72 is a first slider, and the first slider 72 is a guide projecting from the front surface of the lower piece 41a of the front plate 41 of the chassis 37 in the elongated holes 73, 73 formed in the left and right direction. The pins 74, 74 are slidably engaged to be supported so as to be movable in the left-right direction within a certain range, and the tension spring 75 stretched between the pins 74 and 74 is stretched between the pins 74 and 74. The movement force to the right is always urged by the force.

Reference numeral 76 denotes a second slider, and the second slider 76 is provided with guided elongated holes 77, 77 which are spaced apart from each other in the left-right direction, and the guided elongated holes 77, 77 are formed. The lower piece 41 of the front plate 41 of the chassis 37
a guide pin 78 protruding from the lower end of the rear surface of a
78 is slidably engaged.

The guided long holes 77, 77 are
When viewed from the front, the second slider 76 is formed so as to extend in a direction inclined by about 45 ° to the right and left with respect to the up-down direction. Therefore, when the second slider 76 moves to the right, it is displaced downward and to the left. When moving to, it will be displaced upward.

Further, connecting pins 79 and 79 are provided so as to project rearward from the upper end portion of the second slider 76, and the connecting pins 79 and 79 are provided to the holder support arms 44 and 4 respectively.
4'is slidably engaged with engaging elongated holes 51, 51 formed in a connecting plate 50 provided in a bridging manner between front end portions of the 4 '.

Therefore, when the second slider 76 moves to the right, the connecting plate 50 is pressed downward, so that the holder support arms 44 and 44 'are rotated clockwise in FIG. When the cassette holder 24 is moved downward and the second slider 76 is moved leftward, the connecting plate 50 is pushed upward, so that the holder supporting arms 44 and 44 'are rotated counterclockwise in FIG. The cassette holder 24 is rotated in the direction and moved upward.

Reference numeral 80 denotes a connector for connecting the first slider 72 and the second slider 76. The connector 80 has a right end portion which is provided so as to project forward from the right end portion of the first slider 72. A connecting pin 8 rotatably connected to the pin 81 and protruding rearward from the left end thereof.
The rear end of the second slider 76 is vertically slidably engaged with a notch 83 formed in a portion of the lower edge of the second slider 76 near the right end. The two sliders 76 are connected so as to move integrally in the left-right direction.

Therefore, when the optical disc cassette 1 is inserted to the predetermined insertion position of the cassette holder 24, the first slider 72 is moved to the right by the driving means (not shown), whereby the cassette holder 24 is moved to the loading completion position. And the positioning hole 1 formed in the cassette case 2 of the optical disc cassette 1
Positioning pins 30 and 30 'provided on the mechanical chassis 29 are relatively inserted into 0 and 10' to position the optical disc cassette 1 with respect to the reproducing portion, and at the same time, the central portion of the optical disc 16 is positioned. Is placed on the turntable 22, and the attraction plate 18 or 18 ′ is attracted by the magnet 32 provided on the turntable 22 so that the disc portion 17 is pressed onto the turntable 22. .

When the reproducing operation is started from this state, the optical disc 16 rotates integrally with the turntable 22 and the optical pickup device 23 causes the recording surface 17a or 17b of the optical disc 16 to be recorded in the recording area. The recording surface 17a or 17b is irradiated with the laser beam emitted from the objective lens 27 and moved to a position opposite to the position where the signal to be read is recorded. This is detected by 33, whereby the recording signal is read.

When the ejecting operation of the optical disc cassette 1 is started from the state where the cassette holder 24 is at the loading completion position, the first slider 72 is moved to the left and the cassette holder 24 is returned to the eject position. At the same time, the blocking of the forward movement of the optical disc cassette 1 by the lock mechanism (not shown) is released, whereby the shutter release levers 25, 25 'return to the standby position and push the optical disc cassette 1 forward. About half of the optical disc cassette 1 is projected forward from the cassette insertion port 21 of the outer casing 20.

[0093]

As is apparent from the above description, in the optical disc player of the present invention, an opening for exposing a part of the optical disc to the outside is formed in the cassette case accommodating the optical disc. An optical disk cassette provided with a shutter for opening and closing the opening is used, a turntable on which the optical disk is detachably mounted, an optical pickup for irradiating a laser beam to the optical disk, and a shutter for opening the shutter. An optical disc player having opening means, which is attached to the shutter opening means and moves integrally with the shutter opening means, and wipes the light exit surface of the objective lens of the optical pickup during the movement. It is characterized by being provided.

Therefore, according to the optical disc player of the present invention, the cleaning member is moved integrally with the shutter opening means each time the optical disc cassette is mounted and removed, so that the optical disc is mounted and removed. Each time, the light emitting surface of the objective lens of the optical pickup is always cleaned, and furthermore, even without using a special drive means for moving the cleaning member, the optical pickup is not purposely moved. Alternatively, the objective lens can be cleaned without providing a special waiting time for cleaning.

In the above embodiment, the cleaning member is directly attached to the shutter opening means. However, in some cases, the cleaning member is attached to some moving member so that the moving member serves as the shutter opening means. You may make it move together.

[Brief description of drawings]

FIG. 1 shows an example of an embodiment of the optical disc player of the present invention, together with FIGS. 2 to 6. This diagram illustrates the opening operation of the shutter of the optical disk cassette by the shutter opening lever and the cleaning operation for the objective lens of the optical pickup. It is a top view of the principal part for doing.

FIG. 2 is a plan view.

FIG. 3 is a view of I of FIG. 2 in a state where the optical disc cassette is inserted into a cassette holder which is in an eject position.
It is sectional drawing which follows the II-III line.

FIG. 4 is a cross-sectional view taken along the line IV-IV in FIG. 2 in a state where the cassette holder is at the loading completion position.

FIG. 5 is a front view.

FIG. 6 is a perspective view of a shutter release lever of 1.

FIG. 7 is a perspective view showing an example of an optical disc cassette.

[Explanation of symbols]

 1 Optical Disc Cassette 2 Cassette Case 5, 5'Opening 11 Shutter 16 Optical Disc 19 Optical Disc Player 22 Turntable 23 Optical Pickup 25, 25 'Shutter Release Means 27 Objective Lens 27a Light Emitting Surface 28 Cleaning Member

Claims (1)

[Claims] 1. An optical disc cassette is provided which has an opening for exposing a part of the optical disc to the outside in a cassette case in which the optical disc is housed and which is provided with a shutter for opening and closing the opening. An optical disc player comprising a turntable to which an optical disc is detachably mounted, an optical pickup for irradiating the optical disc with a laser beam, and a shutter opening means for opening the shutter, the shutter opening means comprising: An optical disc player provided with a cleaning member which is attached and moves integrally with a shutter opening means, and wipes a light emitting surface of an objective lens of the optical pickup when the shutter is opened.