Objective lens cleaning cartridge

Abstract: An objective lens cleaning cartridge for an optical disc drive apparatus comprises a cartridge body (32), and a cleaning member (41, 43) which can be caused to protrude from or be retracted into the cartridge body (32) in synchronism with a loading operation of the cartridge body into the disc drive apparatus, the cleaning member (41, 43) being brought into sliding cleaning contact with an objective lens (13 a ) of an optical pickup device (13) provided within the disc drive apparatus.

Description: The invention relates to optical disc drive apparatus, for recording and reproducing apparatus for recording and/or reproducing discs, such as optical discs or a magneto-optical discs. In a recent optical disc system, in order to protect a signal recording surface of a disc, an optical disc cartridge system is realised, in which an optical disc is accommodated within a disc cartridge and the optical disc is loaded onto a disc drive apparatus, thereby being recorded and/or reproduced in the condition in which the optical disc is accommodated within the disc cartridge. In this optical disc cartridge system, if the disc cartridge is repeatedly loaded onto the disc drive apparatus, an objective lens of an optical pick-up device within the disc drive apparatus can be smudged with dirt or dust. There is then the risk that normal recording and/or reproduction will be hindered. To remove such disadvantage, various cartridge type cleaners for cleaning the objective lens of the optical pick-up, i.e. a cartridge for cleaning an objective lens have been proposed. For example, brushes can be implanted on the outer surface of, for example, an ordinary disc cartridge to be inserted into the disc drive apparatus so that, after the loading operation is finished, an optical pick-up device is moved to clean its objective lens; and as disclosed in JP-A-63136371, JP-A-1030084 or JP-A-63214976 brushes are implanted on a disc accommodated within a cartridge and this cartridge is inserted into the disc drive apparatus so that, after the loading operation is finished, the disc is rotated to clean the objective lens. However, the above-mentioned previously-proposed cleaning cartridge is of the type such that the objective lens is cleaned by utilising the movement of the optical pick-up device or by utilising the rotation of the disc, so that in such case the cleaning operation needs an electrical driving force. In other words, if the power switch of the disc drive apparatus is not turned ON, the cleaning operation cannot be made. Further, in the latter cleaning cartridge utilising the rotation of the disc, the disc is rotated at high speed, and unavoidably. there is the risk that the objective lens will be damaged by the brushes, which brings about a serious problem in actual practice. To solve the aforementioned problems, the applicants have previously proposed a cleaning cartridge (see Japanese Utility Model Application No. 1-42568) in which there is provided a disc drive optical pick-up cleaning cartridge which utilises a disc cartridge having a correct insertion detecting portion by which when the disc cartridge is correctly inserted into the disc drive apparatus, a disc cartridge locking mechanism is operated to lock the thus inserted disc cartridge. This cleaning cartridge is provided with a cleaning member, for example, a brush formed along the insertion direction of the cartridge and is not provided with the correct insertion detecting portion. When this cleaning cartridge is inserted into the disc drive side, the top of the brush comes into contact with the objective lens of the optical pick-up device to clean the objective lens. Further, the correct insertion detecting portion is not formed so that, if the cartridge is inserted into the innermost portion, the cartridge is not locked and is ejected again. By this loading and/or unloading operation of the cartridge, the optical pick-up device can be cleaned without requiring electrical driving force. In the thus constructed cleaning cartridge and in a cleaning cartridge disclosed in JP-A-1105371, the brush is secured to the cartridge as the cleaning member and also protrudes from the outer surface of the cartridge so that, when the cartridge is inserted into the disc drive apparatus, the brush is brought into contact with a member which is located at the insertion entrance side relative to the objective lens, e.g. a disc turntable. As a consequence, before removing smudges on the objective lens, the brush is smudged by dirt or the like on the turntable and dirt within an opening of the turntable shaft. There is then the risk that the objective lens will be smudged by such dirt. According to the invention there is provided an objective lens cleaning cartridge for an optical disc drive apparatus comprising: a cartridge body; and a cleaning member protruding from the cartridge body characterised in that said cleaning member is retractable into and freely protudes from the cartridge body in synchronism with a loading operation of the cartridge body into the disc drive apparatus to bring the cleaning member into sliding cleaning contact with an objective lens of an optical pickup device provided within the disc drive apparatus. By insertion loading operation of the cartridge onto the disc drive apparatus, the cleaning member can be brought into slidable contact with only an objective lens so that the objective lens can be cleaned reliably. If desired a disc drive mechanism can be cleaned at the same time as an objective lens is cleaned. The cartridge for cleaning an objective lens can prevent the objective leans from becoming electrically charged after having been cleaned by the sliding movement of the cleaning member. The invention is diagrammatically illustrated by way of example in the accompanying drawings. Figure 1 is a perspective view illustrating an example of a disc drive apparatus; Figure 2 is a perspective view of an ordinary disc cartridge with its shutter closed; Figure 3 is a perspective view of an ordinary disc cartridge with its shutter opened; Figures 4 and 5 are plan views used to explain a correct insertion operation of a disc cartridge into disc drive apparatus; Figure 6 is a plan view used to explain the condition obtained if a disc cartridge is erroneously inserted into disc drive apparatus; Figure 7 is a perspective view of a first embodiment of an objective lens cleaning cartridge according to the invention and illustrating from the lower surface side thereof a condition in which a cleaning member is protruding; Figure 8 is a perspective view of the cleaning cartridge of Figure 7 and illustrating from the upper surface side thereof a condition in which the cleaning member is retracted into the cartridge body; Figure 9 is a fragmentary, exploded view of a main portion of the cleaning cartridge of Figure 7; Figure 10 and 11 are respectively partly cutaway plan views used to explain the insertion operation of the cleaning cartridge of Figure 7; Figure 12 is a longitudinal cross-sectional view of a main portion of Figure 10; Figure 13 is a longitudinal cross-sectional view of a main portion of Figure 11; Figure 14 is a partly-omitted plan view of a second embodiment of an objective lens cleaning cartridge according to the invention; Figure 15 is a perspective view of a main portion of the cleaning cartridge of Figure 14; Figure 16 is a schematic diagram used to explain operation of the cleaning cartridge of Figure 14; Figure 17 is a longitudinal cross-sectional view of a main portion of a third embodiment of an objective lens cleaning cartridge according to the invention; Figure 18 is a perspective view of the cleaning cartridge of Figure 17 illustrating from the lower surface side thereof the condition in which a cleaning member is protruding; Figure 19 is a perspective view of the cleaning cartridge of Figure 17 illustrating from the upper surface side thereof the condition in which the cleaning member is retracted into the cartridge body; Figure 20 is a fragmentary, exploded view of a main portion of the cleaning cartridge of Figure 17; and Figures 21 and 22 are respectively longitudinal cross-sectional views of the main portion of the cleaning cartridge of Figure 17 to which references will be made in explaining the operation thereof. Prior to describing an embodiment of a cartridge for cleaning an objective lens according to the invention, an optical disc cartridge system to which the present invention can be applied will hereinafter be described with reference to Figures 1 to 6 by describing an optical disc cartridge system that the applicants have previously proposed (see Japanese Utility Model Application No. 59-180502). Figures 2 and 3 show an example of a disc cartridge 1 which is generally utilised in this optical disc cartridge system. As shown in Figures 2 and 3, this disc cartridge 1 includes a cartridge housing 2 made of, for example, resin in which an optical disc (e.g. magneto-optical disc) 3 is accommodated so as to be freely rotatable. The outer dimension of this disc cartridge 1 is decided in accordance with international standards, that is, this disc cartridge 1 is what might be called a 133mm (5.25 inch) optical disc cartridge. This disc cartridge 1 is of the double-sided type, that is the disc 3 has signal recording surfaces provided on its upper and lower sides. The disc cartridge housing 2 has openings 4 formed at its upper and lower sides in association with the upper and lower signal recording surfaces so that, when this disc cartridge 1 is loaded onto the disc drive apparatus, an optical pick-up is opposed to the signal recording surface of the disc 3 through the opening 4 so as to write and read a signal in and from the recording surface of the disc 3. A shutter 5 is provided in the cartridge housing 2 so as to be slidable in the lateral direction of the cartridge housing 2 in order to open and/or close the openings 4 formed through the upper and lower surfaces. The shutter 5 has a substantially U-letter configuration in cross section formed by bending, for example, a metal plate so that it may cover the front surface portion and the upper and lower surface portions of the cartridge housing 2. In a normal condition, the shutter 5 is located at a closed position so as to close the openings 4. The shutter 5 has formed at a front wall portion thereof an engaging recess 6 used to open and/or close the shutter 5. More specifically, a shutter opening and closing pin (not shown) provided on a disc drive apparatus is engaged into the engaging recess 6, whereby the shutter 5 is opened and/or closed. In association with the engaging recess 6 of the shutter 5, the cartridge housing 2 has formed at a front wall portion 2 a thereof a stepped portion 7 of concave configuration into which the shutter opening and closing pin projects when the shutter opening and closing pin is engaged into the engaging recess 6. Further, the cartridge housing 2 has formed at the front wall portion 2 a thereof a detecting recess 8 as a regular insertion detecting portion which is used to prevent a mis-insertion of the disc cartridge 1 as will be described later. The detecting recess 8 is located such that, when the shutter 5 is in its normal closed condition, it is covered by the shutter 5, while when the shutter 5 is opened, it is exposed. Openings 9 are bored through the top of the cartridge housing 2 so as to determine the position of the disc cartridge 1 when the disc cartridge 1 is loaded onto the disc drive apparatus. Gripping recesses 10 are formed through the side walls of the cartridge housing 2 to help the user to take out the disc cartridge 1 from the disc drive apparatus with his fingers. A shutter locking mechanism is incorporated within the disc cartridge 1 so that, when the shutter 5 is in its closed condition, the shutter 5 is locked by the shutter locking mechanism and when the shutter opening and closing pin is inserted into the engaging recess 6, the shutter 5 locked by the shutter locking mechanism is released. This shutter locking mechanism is not important for understanding of the present invention and therefore will not be described and is not shown. An arrangement of the disc drive apparatus 11 into which the disc cartridge 1 is loaded will be explained below. Referring to Figure 1, a turntable 12 is provided in order to rotate the disc 3 within the disc cartridge 1 loaded onto the disc drive apparatus 11, and an optical pick-up device 13 is provided to oppose the recording surface of the disc 3, the optical pick-up device 13 being movable along the radius direction of the disc 3. An objective lens 13 a is provided on the upper surface side of the optical pick-up device 13 to emit a laser light or beam by which a signal is written in and/or read out from the recording surface of the disc 3. A lens cover 13 b of the optical pick-up device 13 is made of a conductive metal, such as aluminum. The disc cartridge 1 is supported on a supporting base plate 14 which is vertically movably supported on a stationary base plate on which the turntable 12 and the optical pick-up device 13 are secured. The supporting base plate 14 has secured at left and right side portions thereof opposing supporting rails 15 a and 15 b of U-shape in cross section, and the two side portions of the disc cartridge 1 are supported by the two supporting rails 15 a and 15 b when the disc cartridge 1 is loaded onto the disc drive apparatus 11. On the rear portion of the supporting base plate 14, a first shutter opening and closing arm 16 and a second shutter opening and closing arm 17 are pivoted symmetrically with respect to the right and left direction and in an opposing relation to the insertion direction of the disc cartridge 1 thereby to open and close the shutter 5 of the disc cartridge 1. The first and second shutter arms 16 and 17 are displaced from each other in the height direction by an amount greater than the thickness of the disc cartridge 1. That is, the first shutter arm 16 is located at a position lower than the disc cartridge 1 which is loaded onto the disc drive apparatus 11, and the second shutter arm 17 is located at a position higher than the disc cartridge 1. The first shutter arm 16 mounts at a free end thereof a shutter opening and closing pin 16 a which protrudes upwardly, and the second shutter opening and closing arm 17 mounts on a free end thereof a shutter opening and closing pin 17 a which protrudes downwardly. The first and second shutter opening and closing arms 16 and 17 have at the pivot base end portions thereof spring engaging portions 18 and 19 protruding rearwardly, and a tension spring 20 extends between the free ends of the spring engaging portions 18 and 19. Therefore, by the spring biasing force of the tension spring 20, the two shutter opening and closing arms 16 and 17 are spring-biased in the direction in which the shutter opening and closing pins 16 a and 17 a move apart from each other. The two shutter opening and closing arms 16 and 17 are held at pre-determined rotating positions by arm rotation restricting members 21 a and 21 b which are both secured on the supporting base plate 14. Further, left and right cartridge insertion restricting protrusions 22 a and 22 b protrude from the rear portion of the supporting base plate 14 so that, when the disc cartridge 1 is fully inserted into the disc drive apparatus 11, the front wall portion of the disc cartridge 1 is brought in contact with the cartridge insertion restricting protrusions 22 a and 22 b , thereby being engaged therewith. A stopper 23 is provided at the middle of the rear portion of the supporting base plate 14. As will be described later, if the disc cartridge 1 is erroneously inserted into the disc drive apparatus 11, the stopper 23 abuts against the shutter opening and closing pins 16 a and 17 a of the first and second shutter opening and closing arms 16 and 17. An operation in which the disc cartridge 1 is inserted into the thus arranged disc drive apparatus 11 will be described with reference to Figures 4 to 6. When the disc cartridge 1 is correctly inserted into the disc drive apparatus 11 with the cartridge housing front wall portion 2 a leading and its first side (e.g. so-called side A) upward, as shown in Figure 4, the shutter opening and closing pin 16 a of the first shutter opening and closing arm 16 engages in the engaging recess 6 of the shutter 5 whereas the shutter opening and closing pin 17 a of the second shutter opening and closing arm 17 is brought into contact with the front wall portion 2 a of the disc cartridge 1. If the disc cartridge 1 is further pushed into the disc drive apparatus 11 from this state, by a pushing force, the two shutter opening and closing arms 16 and 17 are rotated rearwardly against the spring-biasing force of the tension spring 20. At that time, in accordance with the rotation of the first shutter opening and closing arm 16, the shutter opening and closing pin 16 a acts to move the shutter 5 from the closed position to the open position whereas the shutter opening and closing pin 17 a of the second shutter opening and closing arm 17 slides along the front wall portion 2 a of the disc cartridge 1 and the front wall portion of the shutter 5 independently of the opening operation of the shutter 5. When the disc cartridge 1 is fully inserted into the disc drive apparatus 11, as shown in Figure 5, the shutter 5 is completely moved to the open position thereby to open the opening 4 completely. In this state, the shutter opening and closing pin 17 a of the second shutter opening and closing arm 17, which is not concerned with the opening operation of the shutter 5, enters into the detecting recess 8 of the disc cartridge 1, whereby the front wall portion 2 a of the disc cartridge 1 is brought in contact with the cartridge insertion restricting protrusions 22 a and 22 b without being disturbed by the shutter opening and closing pin 17 a , that is, the disc cartridge 1 is completely inserted into the disc drive apparatus 11 at its pre-determined loading position. When the disc cartridge 1 is completely and correctly inserted into the disc drive apparatus 11, a cartridge locking mechanism (not shown) is operated to lock the disc cartridge 1 so that the disc cartridge 1 cannot be moved. Then, the supporting base plate 14 is wholly lowered to place the disc 3 accommodated within the disc cartridge 1 on the turntable 12, to complete the loading operation. If on the other hand the disc cartridge 1 is correctly inserted into the disc drive apparatus 11 from the front wall portion 2 a side under the condition that the disc cartridge 11 is turned over, that is, the disc cartridge 1 is inserted thereinto with its reverse surface (i.e. so-called side B) facing upward, the shutter opening and closing pin 17 a of the second shutter opening and closing arm 17 is engaged with the engaging recess 6 of the shutter 5 whereas the shutter opening and closing pin 16 a of the first shutter opening and closing arm 16 comes in contact with the front wall portion 2 a of the disc cartridge 1. When the disc cartridge 1 is further pushed into the disc drive apparatus 11 from this state thereby to rotate the two shutter opening and closing arms 16 and 17 rearwardly, the shutter 5 is moved in its opening direction by the shutter opening and closing pin 17 a of the second shutter opening and closing arm 17 whereas the shutter opening and closing pin 16 a of the first shutter opening and closing arm 16 slides along the front wall portion 2 a of the disc cartridge 1 without being affected by the opening operation of the shutter 5. When the disc cartridge 1 is inserted into the innermost portion of the disc drive apparatus 11, the shutter opening and closing pin 16 a , which is not related to the opening operation of the shutter 5, enters into the detecting recess 8 with the result that the disc cartridge 1 is completely inserted into the disc drive apparatus 11, thus being locked at that position. If the disc cartridge 1 is not correctly inserted into the disc drive apparatus 11 with its front wall portion 2 a leading, for example the disc cartridge 1 is erroneously inserted into the disc drive apparatus 11 from the opposite direction, that is, with its rear wall portion 2 b leading, the shutter 5 is not moved at all and the shutter opening pins 16 a and 17 a merely slide along the rear wall portion 2 b of the disc cartridge 1, the two shutter opening and closing arms 16 and 17 thereby being rotated rearwardly. Under the condition that the disc cartridge 1 is inserted into the innermost portion of the disc drive apparatus 11, as shown in Figure 6, the two shutter opening and closing pins 16 a and 17 a abut against the stopper 23 before the disc cartridge 1 comes into contact with the cartridge insertion restricting protrusions 22 a and 22 b , that is, the shutter opening and closing pins 16 a and 17 a are sandwiched between the disc cartridge 1 and the stopper 23 because the rear wall portion 2 b of the disc cartridge 1 has no recess therein into which the shutter opening and closing pins 16 a and 17 a can enter. As a consequence, the disc cartridge 1 is blocked by the shutter opening and closing pins 16 a and 17 a so that it cannot be fully inserted into the disc drive apparatus 11 to its pre-determined loading position. Accordingly, since the cartridge locking mechanism is not operated, the disc cartridge 1 will be ejected to prevent the disc cartridge 1 from being erroneously inserted into the disc drive apparatus 11. The present invention relates to a cleaning cartridge for cleaning an objective lens of an optical pick-up device of an optical disc drive apparatus in an optical disc cartridge system. An embodiment of the present invention will now be described in detail with reference to Figures 7 to 13. As illustrated, there is provided a cartridge 31 which is substantially the same in size as the disc cartridge 1 described above. The cartridge 31 is composed of a housing-shaped main body 32 made of synthetic resin and which is formed of a base wall 32 a , two side walls 32 b , 32 c , a rear wall 32 d and a lid plate 33 made of a conductive metal and which covers the upper surface side of the housing-shaped main body 32. Openings 34 and 35 are formed through the base wall 32 a and the front middle portion of the lid plate 33 of the housing-shaped main body 32, that is, the portions corresponding to the first half portions of the openings 4 of the disc cartridge 1 through which the optical pick-up device opposes. A shutter 36 which opens and/or closes the openings 34 of the housing-shaped main body 32 is secured by screws 38 to a slider 37 which is slidable between the front edges of the housing-shaped main body 32 and the lid plate 33 in the lateral direction at a bent front surface 36 a of the shutter 36. Also, a rear edge 36 b of the shutter 36 is engaged in a guide groove 39 formed in the lateral direction of the bottom portion 32 a of the housing-shaped main body 32, whereby the shutter 36 is slidable in the lateral direction. An engaging recess 40 is formed in the front surface side of the shutter 36, that is the bent front surface 36 a and in the slide 37 whereby the shutter 36 can be opened and closed from the upper surface side. Similarly to the shutter 5 of the aforementioned disc cartridge 1, when a shutter opening and closing pin of the disc drive apparatus side, that is, the shutter opening and closing pin 17 a of the second shutter opening and closing arm 17 in the aforementioned disc drive apparatus 11 is inserted into the above-mentioned engaging recess 40, the shutter 36 is opened and/or closed. A cleaning member 30 is provided on the cartridge 31 which is substantially the same as the aforenoted disc cartridge 1 both in size and in shape, thus forming a cleaning cartridge. More specifically, in the inside of the housing-shaped main body 32 of the cartridge 31, a rotating member 41 is rotatably supported in the lateral direction by shaft pins 42 a , 42 b , protruding from the front and back surfaces thereof in the front to back direction of the opening 34. Further, a plurality of brushes 43 are implanted on the rotating member 41 in the front to rear direction in which direction the cartridge 31 is inserted into the disc drive apparatus 11, thus forming the cleaning member 30. The rotating member 41 is rotated by an interlocking mechanism 44 which is operated in unison with the opening and closing operation of the aforementioned shutter 36. Then, under the condition that the opening 34 is opened by the shutter 36, the brushes 43 protrude from the outer surface side of the base wall 32 a of the housing-shaped main body 32. The inter-locking mechanism 44 which rotates the rotating member 41 in unison with the opening and closing operation of the shutter 36 comprises a slide lever 45 slidably laterally and supported by and engaged with the base wall 32 a of the housing-shaped main body 32 along the rear portion of the opening 34 and a rotating lever 46 pivoted to the base wall 32 a at the position near the front end portion and whose front end portion 46 a is opposed to the inner surface side of the slider 37 to which the shutter 36 is secured and whose rear end portion 46 b is engaged with one end of the slide lever 45. The engagement between the slide lever 45 and the rotating lever 46 is effected by inserting a pin 47 protruding from one end of the slide lever 45 downwardly in the vertical direction into an elongate opening 48 formed in the rear end portion 46 b of the rotating lever 46 in a direction crossing the sliding direction of the slide lever 45. Further, an engaging pin 49 protrudes from the surface of the slide lever 45 corresponding to the rear end of the opening 34, at a position (displaced position) distant from the pivoting axis of the rotating member 41. In the thus arranged inter-locking mechanism 44, the slide lever 45 is spring-biased by a tension spring 50 in one direction so that the front end portion 46 a of the rotating lever 46 is always in contact with the inner surface side of the slider 37. On the inner surface side of the slider 37 to which the front end portion 46 a of the rotating lever 46 of the inter-locking mechanism 44 is opposed, a plane cam 37 a is formed which opposes the front end portion 46 a of the rotating lever 46 in the condition in which the shutter 36 closes the opening 34 of the housing-shaped main body 32. The plane cam 37 a is matched at a pre-determined timing of the opening and closing operation of the shutter 36. The slider 37 is spring-biased by a torsion spring 51 such that the shutter 36 is biased to close the opening 34. A lower side guide edge 52 for the slider 37 is formed on the inside of the front edge portion of the base wall 32 a of the housing-shaped main body 32, and side edge members 53 a and 53 b of heights substantially the same as those of the side walls 32 b and 32 c are formed vertically on the insides of the two side edges of the opening 34, thereby forming an accommodating portion 54 in which the cleaning member 30 formed of the rotating member 41 and the brushes 43 are accommodated. On the other hand, in the lid plate 33 which covers the upper surface side of the housing-shaped main body 32, the front edge portion thereof is bend downwardly, that is, bent toward the housing-shaped main body 32 in an opposing relation to the guide edge 52, thereby being formed as an upper side guide edge 55 for the slider 37. Further, on one side edge of the opening 35, a contact edge member 56 is integrally formed by a bending process of the lid plate 33, with which the top of the brush 43 is brought into contact when the top of the brush 43 is overlapped on the inside of the opposing side edge member 53 a in the condition in which one side edge member of the opening 34 of the housing main body 32, that is, the cleaning member 30 is accommodated within the accommodating portion 54. On the other side edge of the opening 35, a stopper edge member 57, which restricts the rotational range (substantially 90 degrees) of the rotating member 41, is formed by bending the lid plate 33 under the condition such that this stopper edge member 57 protrudes slightly toward the inside of the opening 35. The opening 35 of the lid plate 33 is not always needed but can be formed as a punched aperture used to erect the aforementioned contact edge member 56 and the stopper edge member 57. Dirt and fluff on the brushes 43 can be brushed off outwardly by utilising the opening 35. A cleaning operation of the thus arranged cleaning cartridge will be described. As illustrated, when the cleaning cartridge, that is, the cartridge 31 is inserted into the disc drive apparatus 11 from the front wall side with the housing-shaped main body 32 facing downwardly similarly to the disc cartridge 1, the shutter opening and closing pin 17 a of the second shutter opening and closing arm 17 is engaged with the engaging recess 40 formed in the shutter 36 and the slider 37, whereas the shutter opening and closing pin 16 a of the first shutter opening and closing arm 16 merely comes in contact with the front edge of the housing-shaped main body (see Figure 10). If the cartridge 31 is further pushed into the disc drive apparatus 11 from this state, then the two shutter opening and closing arms 16 and 17 are rotated backwardly by such pushing force against the spring-force of the tension spring 20. At that time, the shutter opening and closing pin 17 a acts to move the shutter 36 from the closed position in the opening direction in unison with the rotation of the second shutter opening and closing arm 17, whereas the shutter opening and closing pin 16 a of the first shutter opening and closing arm 16 slides along the front surface 36 a of the shutter 36 from the front edge of the housing-shaped main body 32 without contributing to the opening operation of the shutter 36. As described above when the cartridge 31 is inserted into the disc drive apparatus 11, in the opening operation of the shutter 36, the slider 37 is slid together under the condition that the cam surface 37 a is in slidable contact with the front end portion 46 a of the rotating lever 46 of the inter-locking mechanism 44. In this state, the rotating lever 46 is not rotated so that the interlocking mechanism 44 is made in-operative. In this state, the movement of the shutter 36 in the opening direction is maintained, and when the opening 34 of the housing-shaped main body 32 has passed over the turntable 12, the cam surface 37 a of the slider 37 is detached from the front end portion 46 a of the rotating lever 46, whereby the rotating lever 46 is freed for rotation. The slide lever 45 is slid by the spring-biasing force of the tension spring 50. By the sliding operation of the slide lever 45, the rotating member 41 of the cleaning member 30 is rotated by means of the engaging pin 49 and the brushes 43 implanted on the rotating member 41 are caused to protrude through the opening 34 of the housing-shaped main body 32 to the outside, that is, the outside surface side of the base wall 32 a , causing the tips of the brushes 43 to slide along the objective lens 13 a of the optical pick-up device 13. Therefore, dirt and smudges on the surface of the objective lens 13 a are removed, that is, cleaning of the objective lens 13 a is effected. As described above, under the condition that the cartridge 31 is inserted into the innermost portion of the disc drive apparatus 11 while cleaning the objective lens 13 a , the first shutter opening and closing pin 16 a of the first shutter opening and closing arm 16 abuts against the stopper 23 before the cartridge 31 comes in contact with the insertion restricting protrusions 22 a and 22 b that is, the first shutter opening and closing pin 16 a is sandwiched between the front surface portion of the cartridge 31 and the stopper 23 because the front wall portion of the cartridge 31, that is, the front end of the housing-shaped main body 32 has no detecting recess which the shutter opening and closing pin 16 a of the first shutter opening and closing arm 16 can enter. This condition is the same as the condition that the disc cartridge 1 is erroneously inserted into the disc drive apparatus 11 (see Figure 6). Therefore, the cartridge 31 cannot be fully inserted into the pre-determined loading position (see Figure 11). Accordingly, the cartridge 31 cannot be locked at the predetermined loading position so that, when the cartridge 31 is released from being pushed by hand, the cartridge 31 will be pushed in the ejecting direction by the rotational spring biasing force of the tension spring 20 which rotates the two shutter opening and closing arms 16 and 17. In this initial stage of ejection, the opening 34 of the housing-shaped main body 32 is open and the brushes 43 protrude with the result that the tips of the brushes 43 are again brought into sliding contact with the objective lens 13 a whereby cleaning of the objective lens 13 a is again performed. Thereafter, the shutter 36 slides in the closing direction, and when the opening 34 of the housing-shaped main body 32 has passed over the optical pick-up device 13, by sliding operation of the slider 37, the cam surface 37 a comes in contact with the front end portion 46 a of the rotating lever 46 and presses the same, whereby the rotating lever 46 is rotated to cause the slide lever 45 to be slid against the spring-biasing force of the tension spring 50. By the sliding operation of the slide lever 45, the rotating member 41 of the cleaning member 30 is rotated in the reverse direction by means of the engaging pin 49, that is, the rotating member 41 is rotated so that the brushes 43 are fully retracted into the housing-shaped main body 32 and are accommodated within the accommodating portion 54. Under this condition, the shutter 36 passes over the turntable 12 while being slid in the closing direction as the cartridge 31 is ejected. The above-mentioned insertion and eject operations of the cartridge 31 can be performed several times, whereby cleaning of the objective lens 13 a of the optical pick-up device 13 can be carried out substantially completely. As described above, when the cleaning cartridge 31 of this embodiment is inserted into and ejected from the disc drive apparatus 11, the brushes 43 of the cleaning member 30 protrude only at the position corresponding to the optical pick-up device 13 to come into slidable contact with the objective lens 13 a . There is then no risk that the objective lens 13 a will be smudged by smudges of other portions such as the cartridge insertion opening, the turntable, the turntable shaft or the like. Therefore, the objective lens 13 a can be cleaned positively, and when the cleaning cartridge 31 is not in use, the cleaning member 30 can be automatically protected by the shutter 36. A second embodiment of the invention will be described with reference to Figures 14 to 16. Throughout Figures 14 to 16, like parts corresponding to those of the preceding embodiment are marked with the same references and therefore will not be described in detail. Also in this embodiment, the cartridge 31 of substantially the same size as that of the disc cartridge 1 is composed of the housing-shaped main body 32 and the lid plate 33 made of the conductive metal and which covers the upper surface side of the housing-shaped main body 32. The shutter 36 which opens and/or closes the opening 34 formed through the base wall 32 a of the housing-shaped main body 32 is secured at its bent front wall portion 36 a to the slider 37 slidably engaged between the housing-shaped main body 32 and the front edge of the lid plate 33 in the lateral direction, and protrusions 36 b 1 and 36 b 2 protruding from the rear edge 36 b are engaged in guide slots 39 of slit-shaped configurations formed through the base wall 32 a of the housing-shaped main body 32 in the lateral direction whereby the shutter 36 can be freely slid in the lateral direction. The engaging recess 40 for opening and closing operations is also formed in the front wall side of this shutter 36 in a range of from the bent front wall portion 36 a to the slider 37. The housing-shaped main body 32 of the cartridge 31 houses the cleaning member 30 in an opposing relation to the opening portion 34. This cleaning member 30 includes the rotating member 41 which has a length substantially covering the front to rear of the opening 34, and the shaft pins 42 a and 42 b which protrude from the front and rear end faces thereof and are supported by the front and rear edge portions of the opening 34 to be rotatable in the lateral direction. Further, a plurality of brushes 43 are implanted on the rotating member 41 in the front to rear direction in which direction the cartridge 31 is inserted into the disc drive apparatus 11. In this cleaning member 30, the rotating member 41 is rotated in unison with the opening and closing operation of the shutter 36, and under the condition that the opening 34 is opened by the shutter 36, this rotating member 41 is rotated so that the brushes 43 protrude from the outside surface side of the base wall 32 a of the housing-shaped main body 32. In the second embodiment, an interlocking member for the cleaning member 30 and the shutter 36 is different to the interlocking mechanism 44 of the first embodiment. The interlocking mechanism 144 of this second embodiment comprises an engaging pin 145 protruding from the slider 37 at its inside wall 37b to which the shutter 36 is secured as a pushing member and an engaging protruding face 146 protruding from the front end wall 41 a of the rotating member 41 of the cleaning member 30 opposing the inside wall 37 b of the slider 37 as a pushed member and which is brought into contact with the engaging pin 145 in the sliding operation of the slider 37. More specifically, as shown in Figure 16, the engaging protruding face 146 comprises a first engaging protruding surface 146 a pushed by the engaging pin 145 in the sliding operation of the slider 37 when the shutter 36 is opened and a second engaging protruding surface 146 b pushed by the engaging pin 145 in the returning slide operation of the slider 37 when the shutter 36 is closed. In the thus arranged interlocking mechanism 144 of the cleaning member 30 and the shutter 36, when the slider 37 is slid in the direction in which the shutter 36 opens the opening 34 of the housing-shaped main body 32, the engaging pin 145 comes into contact with the first engaging protruding surface 146 a of the rotating member 41. If the slider 37 is further slid in the opening direction, the first engaging protruding surface 146 a is pushed by the engaging pin 145 so that the rotating member 41 is rotated about the shaft pins 42 a and 42 b . Then, under the condition that the opening portion 34 is opened substantially completely, the brushes 43 implanted on the rotating member 41 protrude to the outside surface side of the base wall 32 a of the housing-shaped main body 32 through the opening 34. Further, under the condition that the brushes 43 of the cleaning member 30 protrude from the opening 34 of the housing-shaped main body 32, the second engaging protruding surface 146 b of the rotating member 41 is opposed to the engaging pin 145 of the slider 37. If under this condition the slider 37 is slid in the direction in which the shutter 36 closes the opening 34, then the engaging pin 145 comes into contact with the second engaging protruding surface 146 b of the rotating member 41 and pushes the second engaging protruding surface 146 b thereby to rotate the rotating member 41 in the direction opposite to the aforenoted direction. Thus, the brushes 34 are retracted into the housing-shaped main body 32 from the opening 34 and the shutter 36 closes the opening 34. In order to ensure that the brushes 43 of the cleaning member 30 are reliably protruded from or retracted into the opening 34 of the housing-shaped main body 32 in the above-mentioned operation, the end portion of the first engaging protruding surface 146 a of the rotating member 41 is formed as a pushing face 146 a 1 which is substantially parallel to the surface of the rotating member 41 on which surface the brushes 43 are implanted, and the end portion of the second engaging protruding surface 146b is formed as a pushing surface 146 b 1 which is substantially perpendicular to the surface of the rotating member 41 on which the brushes 43 are implanted, respectively. The first and second engaging protruding surfaces 146 a and 146 b are formed as described above so that, when the rotating member 41 is rotated by the engaging pin 145 of the aforementioned slider 37, that is, when the rotating member 41 is rotated so as to protrude the brushes 43 in the opening operation of the shutter 36, in the final stage, the engaging pin 145 is brought into contact with the pushing face 146 a 1 of the first engaging protruding surface 146 a to push the same. Thus, the rotating member 41 is rotated so as to cause the brushes 43 to be placed in a substantially completely protruding condition. Further, when the rotating member 41 is rotated so as to cause the brushes 43 to be retracted into the opening 34 in the closed condition of the shutter 36, in the final state, the engaging pin 145 comes into contact with the pushing surface 146 b 1 of the second engaging protruding surface 146 b thereby to rotate the rotating member 41 so that the brushes 43 are reliably retracted into the housing-shaped main body 32. According to the thus arranged cleaning cartridge of the second embodiment, similarly to the cleaning cartridge of the first embodiment, this cleaning cartridge is inserted into and loaded on the disc drive apparatus thereby to perform the cleaning of the objective lens. That is, when the cartridge 31 is inserted into the disc drive apparatus 11 from the front wall side with its housing-shaped main body 32 facing downward, then the slider 37 is slid in the opening direction of the shutter 36 thereby to cause the brushes 43 to protrude from the base wall 32 a of the housing-shaped main body 32. Accordingly, the tips of the brushes 43 are brought in sliding contact with the objective lens of the optical pickup device thereby to remove dirt, smudges and so on from the surface of the objective lens, whereby the objective lens is cleaned. While in this embodiment the mechanism for directly transmitting the sliding operation of the slider 37 to the rotational operation of the rotating member 41 on which the brushes 43 are implanted is formed by the contact pushing mechanism composed of the engaging pin 145 and the engaging protruding surfaces 146 a and 146 b , this mechanism is not limited thereto and may be formed of other suitable interlocking mechanisms, such as a cam mechanism. As described above, according to the second embodiment, since the slider 37 to which the shutter 36 for opening and closing the opening 34 of the housing-shaped main body 32 is secured is slidably moved directly to rotate the rotating member 41 on which the brushes 43 of the cleaning member 30 are implanted and a supporting mechanism utilizing a spring force is omitted, the operation can be stabilized more and the quality of the cleaning cartridge can be improved. Also, the number of parts is decreased so that the assembly process can be simplified and hence the cleaning cartridge can be made at low cost. The contact member 56 formed on the lid plate 33 side and which is inserted into the accommodating portion 54 of the cleaning member 30 formed on the housing main body 32 of the cartridge 31 to make contact with the tips of the brushes 43 can be formed as a wave shape or the like, whereby dust on the brushes 43 can be brushed off by the contact of the contact member 56 with the brushes 43, whereby the brushes themselves are cleaned. Further, shapes and constructions of the respective members can be properly modified such as when the opening 35 of the lid plate 33 is omitted so long as the operation similar to the above-mentioned operation can be effected. As described above, according to the above embodiments of the cleaning cartridge of the invention, dust on the objective lens of the optical pickup device within the disc drive apparatus can be easily removed without requiring an electrical driving force at all. Particularly, since the cleaning member is retracted into the cartridge in unison with the loading operation of the disc cartridge, the cleaning member is slid only along the objective lens without contacting other portions before being slid along the objective lens, thereby substantially completely avoiding the disadvantage that dust on other portions is caused to adhere to the objective lens. Therefore, the objective lens is cleaned reliably. Furthermore, when not in use, the cleaning member is retracted into the cartridge and protected therein so that the cleaning member can be prevented from being deformed and smudged undesirably. Therefore, the cleaning member can be repeatedly utilized over a long period of time. In the aforementioned embodiments of the cleaning cartridge, however, the brush provided as the cleaning member can clean only the objective lens but such cleaning member cannot clean the disc drive mechanism, such as the turntable, the turntable shaft and so on. The turntable of the disc drive mechanism is easily smudged by dirt or the like and also when a disc hub is chucked to the turntable shaft in the loading operation of the disc cartridge onto the disc drive mechanism, both of the disc hub and the turntable shaft are rubbed with each other and the turntable shaft itself is worn so that metal powders thereof smudges the turntable, the top of the turntable shaft or the like. There is then the risk that the mis-chucking will occur. Figure 17 shows a main portion of a third embodiment of the invention which can remove the above-described shortcomings and disadvantages. In Figure 17, like parts corresponding to those of the preceding embodiments are marked with the same references and therefore will not be described in detail. As shown in Figure 17, the cartridge 31 which is substantially the same as the disc cartridge 1 in size and in outward appearance is provided with the lens cleaning member 30 and a disc drive mechanism cleaning member 300, whereby a cleaning cartridge is constructed. Further, as shown in Figure 17, brushes 430 of the same diameter and of substantially the same width as the diameter of the turntable 12 are implanted on the lower surface central potion of the cartridge 31, that is, the outer surface side middle portion of the base wall 32 a of the housing main body 32, whereby the disc drive mechanism cleaning member 300 is formed. These brushes 430 are formed by hard brush bundles so as to establish a positional relationship such that, when the brushes 43 are located over the optical pickup device 13, the brushes 430 are placed over the turntable 12. Accordingly, the brushes 430 for the disc drive mechanism cleaning member 30 and which are implanted on the outer surface side central portion of the base wall 32 a of the housing main body 32 are slid along the top surface of the turntable 12. Thus, dusts and smudges or the like on the surface of the objective lens 13 a and the turntable 12 are removed, that is, the objective lens 13 a , the turntable 12 and the turntable shaft are cleaned. The brushes 430 of the disc drive mechanism cleaning member 300 are formed above the turntable 12 so as to become shorter than the protruded length of the brushes 43 of the lens cleaning member 30 in view of the height and positional relationship relative to the optical pickup device 13. As described above, according to the third embodiment of the present invention, dusts and smudges on the objective lens of the optical pickup device and the disc drive mechanism such as the turntable or the like within the disc drive apparatus can be easily removed. Particularly, since the objective lens and the disc drive mechanism are cleaned at the same time, this cleaning can save time and a lot of trouble, and also dust from one member can be prevented from being moved to smudge the other member. That is, the members of the two sides can be cleaned reliably, thereby maintaining the optical disc drive apparatus in such excellent condition that the optical disc, the magneto optical disc or the like can always be recorded and/or reproduced positively. Usually, the objective lens of an optical pickup device within disc drive apparatus is moulded from a resin, and a brush made of resin or cloth is used as the cleaning member of the above-mentioned embodiments of the cleaning cartridge of the present invention. Thus, when the cleaning member moulded by the resin is slid along the objective lens made of the resin, dusts and smudges on the objective lens are removed whereas static electricity is charged on the cleaning member and the objective lens by friction caused by the sliding operation therebetween. As a consequence, an objective lens driving electric circuit is troubled by static electricity charged on the objective lens, which causes a malfunction. Further, since the cleaning member is charged by static electricity, dust adheres to the cleaning member itself and such dust will be caused to adhere to the objective lens in the next cleaning operation. On the contrary, there is then the risk that the objective lens will be smudged. A fourth embodiment of the present invention, which can remove the aforenoted shortcomings and disadvantages of the embodiments, will hereinafter be explained with reference to Figures 18 to 22. In Figures 18 to 22, like parts corresponding to those of the preceding embodiments are marked with the same references and therefore need not be described in detail. As illustrated, in the brush 43 implanted on the rotating member 41 for forming the cleaning member 30, brush bundles 43 a and 43 b placed on the front and rear of the row of brushes are formed as conductive brushes which undergo the conductive-treatment, whereas a plurality of brush bundles 43 c placed in the intermediate portion of the row of brush are formed as ordinary brushes. The contact edge member 56 with which the tips of the brushes 43 make contact is formed so as to become a static electricity earth. A cleaning operation of the fourth embodiment will be explained. In this cleaning operation, the brush 43 of the cleaning member 30 is slid along the objective lens 13 a as follows. When the cartridge 31 is inserted into the disc drive apparatus 11, the conductive brush bundle 43 a at the front end portion is initially brought into slidable contact with the conductive lens cover 13 b of the optical pickup device 13 and then the objective lens 13 a and then the ordinary brush bundles 43 c provided at the intermediate portion are sequentially brought in sliding contact with the objective lens 13 a . Finally, the conductive brush bundle 43 c provided at the rear end portion is slidably moved along the objective lens 13 a to the conductive lens cover 13 b . When the cartridge 31 is ejected from the disc drive apparatus 11, in the order opposite to the aforementioned order, the conductive brush bundle 43 b provided at the rear end portion is first brought into slidable contact with the conductive lens cover 13 b of the objective lens 13 a and finally, the conductive brush bundle 34 a provided at the front end portion is brought into slidable contact with the objective lens 13 a and the lens cover 13 b . When the cleaning member 30 is accommodated within the cartridge 31, or within the accommodating portion 54 of the housing main body 32, the tips of the respective brushes 43 a to 43 c of the brush 43 are brought into contact with the contact edge member 56 of the lid plate 33 and maintained in that condition. Further, when the cartridge 31 is inserted into and/or ejected from the disc drive apparatus 11, or in the cleaning operation, in the brush 43 of the cleaning member 30, the conductive brushes 43 a and 43 b provided at the front and rear ends are slidably moved across the objective lens 13 a and the conductive lens cover 13 b of the optical pickup device 13, whereby static electricity generated on the objective lens 13 a is conducted (i.e. escapes) into the lens cover 13 b . As a result, since the lens cover 13 b is electrically connected to the base side of the disc drive apparatus 11, the static electricity is earthed and the charged condition is removed. Furthermore, since the cleaning member 30 is accommodated into the accommodating portion 54 and the tip of the brush 43 is brought into contact with the contact edge member 56 of the conductive lid plate 33 when the cartridge 31 is ejected from the disc drive apparatus 11, charges on the ordinary brushes 43 c of the brush 43 escape to the lid plate 33 side and are discharged to the base side of the disc drive apparatus 11, so that the charged condition is removed. Accordingly, a bad influence exerted upon the objective lens driving circuit by static electricity charged on the objective lens 13 a can be reduced and dust can be prevented from adhering to the objective lens 13 a . Furthermore, the brush 43 itself can be protected from being smudged by dust and the objective lens 13 a itself can be cleaned reliably. In the described embodiments wherein the brushes are directly implanted on the lower surface of the cartridge as the cleaning member, if the brush bundles at the front and rear ends are made to be conductive, charges on the objective lens can be removed. In that case, charges on the brush itself can be removed by contacting the brush with another conductive metal plate. Since the charged static electricity of at least one of the objective lens and the cleaning member is removed after the completion of the cleaning operation, dust on the objective lens of the optical pickup device within the disc drive apparatus can be removed easily and positively, and also the objective lens can be protected from being smudged by new dust. The amount of special antistatic material applied to the objective lens on the cleaning member can be reduced to reduce the cost of the cleaning cartridge.

Claims: An objective lens cleaning cartridge (31) for an optical disc drive apparatus comprising: a cartridge body (32); and a cleaning member (30) protruding from the cartridge body (32) characterised in that: said cleaning member (30) is retractable into and freely protudes from the cartridge body (32) in synchronism with a loading operation of the cartridge body (32) into the disc drive apparatus to bring the cleaning member into sliding cleaning contact with an objective lens (13 a ) of an optical pickup device (13) provided within the disc drive apparatus (11). An objective lens cleaning cartridge according to Claim 1, in which the cartridge includes driving means to cause the cleaning member (30) to protrude from the cartridge body (32) in synchronism with the loading operation of the cartridge body into the disc drive apparatus. An objective lens cleaning cartridge according to Claim 2, in which the cleaning member (30) is rotatably provided within a recess formed on the cartridge body, the cleaning member protruding from an opening (34) of the cartridge body (32) in synchronism with a loading operation of the cartridge into the disc drive apparatus by the driving means and the cleaning member being retracted into the recess in the cartridge in synchronism with an unloading operation of the cartridge from the disc drive apparatus. An objective lens cleaning cartridge according to Claim 3, in which the driving means includes a shutter (36) which is freely movable in the cartridge body (32) and the driving means protrudes and retracts the cleaning member by means of the shutter which is moved in accordance with loading and unloading operations of the cartridge into and from the disc drive apparatus. An objective lens cleaning cartridge according to Claim 2, in which the cleaning member is operated by the driving means so that the cleaning member protrudes from the cartridge body before reaching a position opposing the objective lens of the disc drive apparatus. An objective lens cleaning cartridge according to Claim 5, in which the driving means drives the cleaning member such that the cleaning member protrudes in the direction of the cartridge body at a timing point at which the cleaning member (3) has passed over the disc driving means (12) within the disc drive apparatus in accordance with the loading operation of the cartridge into the disc drive apparatus. An objective lens cleaning cartridge according to Claim 1, in which the cartridge further includes other cleaning means (430) provided on the cartridge body (32) at its main surface of a direction in which the cleaning member is protruded, the other cleaning means (430) being provided to clean a surface of the disc rotating and driving means (12) of the disc drive apparatus (11). An objective lens cleaning cartridge according to Claim 1, in which the cleaning member (30) is arranged so as to come into contact with static electricity removing means (56) provided on the cartridge body (32) when the cleaning member (30) is in its retracted state relative to the cartridge body (32). An objective lens cleaning cartridge according to Claim 1, in which the cartridge includes a shutter (36) which is freely movable relative to the cartridge body (32), and when the shutter is moved by the loading operation of the cartridge onto the disc drive apparatus, the cleaning member is caused to protrude from the cartridge body. An objective lens cleaning cartridge according to Claim 9, in which the cleaning member (30) is caused to protrude from an opening (34) formed in the shutter (36) when the shutter (36) is moved in accordance with the loading operation of the cartridge onto the disc drive apparatus. An objective lens cleaning cartridge according to Claim 10, in which the cleaning member is rotated in the direction in which the cleaning member is caused to protrude from the cartridge body (32) or in the direction in which the cleaning member (30) is retracted into the cartridge body (32) by a slider (41) rotatably provided within a recess in the cartridge body (32) and which is moved together with the shutter (36).

Inventors: HASEGAWA HIROYUKI C O PATENTS, HOSHINO HIRONARI C O PATENTS D, NAITO TAKASHI C O PATENTS DIVI, SUZUKI MINEAKI C O PATENTS DIV, HASEGAWA, HIROYUKI, C/O PATENTS DIVISION, HOSHINO, HIRONARI, C/O PATENTS DIVISION, NAITO, TAKASHI, C/O PATENTS DIVISION, SUZUKI, MINEAKI, C/O PATENTS DIVISION
Applicants: SONY CORP, SONY CORPORATION
Application year: 1991
Main classification: G11B23
IPC codes: G11B23, G11B17, G11B7