JPH0567916U - Lens cleaner for optical head - Google Patents

Abstract

(57) [Summary] [Object] The present invention relates to a cartridge-type lens cleaner for an optical head, which has a higher lens cleaning effect and does not diffuse the removed dirt to other parts in the optical disk device. The purpose is to provide. [Structure] A pad 1 made of a stretchable elastic material having a suction property is uniformly pressed onto the surface of an objective lens by a pad / plate spring connecting member 2, a plate spring 3, and a plate spring / coil connecting member 15 to form a side yoke. 11, center yoke 12,
By performing a frictional movement by the magnet 13 and the coil 14, the dirt adhering to the surface of the objective lens is uniformly removed and adsorbed. By using the leaf spring 3 having resonance, the driving energy required for friction is reduced.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a lens cleaner for an optical head, and more particularly to a cartridge-type lens cleaner for removing dirt on the surface of an objective lens of an optical head in an optical disk device.

[0002]

[Prior Art]

 In the optical disc device, when recording, reproducing, erasing information, etc., a spot laser beam with a diameter of about 1 μm is used on the surface of the disc for recording and reproducing. Therefore, a high-precision optical head is indispensable.

When the optical disk device is used for a long time, dust that has entered from the outside is gradually accumulated on the optical head portion or an adhesive substance containing water is fixed. In particular, if the surface of the objective lens that collects the laser light becomes dirty as described above, the amount of light that passes through the object lens will decrease, and the image focused will become distorted or blurred. As a result, troubles are likely to occur, such as the spot laser light being out of focus, the tracking servo not being successful, and errors occurring frequently when recording, reproducing, and erasing information.

In order to prevent the above-mentioned troubles, it is effective to remove the dirt adhering to the surface of the optical lens, but the general consumer disassembles the optical disk device to clean the surface of the objective lens. It is difficult. Therefore, conventionally, a cartridge type lens cleaner for an optical head has been provided for the purpose of enabling general consumers to easily remove dirt on the surface of the objective lens of the optical head.

FIG. 6 shows an example of the above-described optical head lens cleaner that has been conventionally used. In this optical head lens cleaner, when the switch pressing rod 94 protruding to the outside of the housing 90 is pressed, the switch 95 is short-circuited and the motor 97 is rotated by the electric power supplied from the battery 96. The rotation of the motor 97 is transmitted to the dust removing brush 99 via the connecting rod 98, and the dust removing brush 99 rotates.

FIG. 5 shows a usage pattern of the conventional lens cleaner for an optical head. The lens cleaner cartridge 102 is inserted into the optical drive device 101 through the cartridge disc insertion opening, and the dust removing brush 99 in FIG. 5 contacts the objective lens 91 in the optical head 100. Then, when the switch pressing rod 94 is pressed, the dust removing brush 99 rotates as described above, and the dust adhering to the surface of the objective lens 91 is removed. At this time, the dust removing brush 99 rotates about a rotation axis which is perpendicular to the optical axis of the objective lens 91 and parallel to the cartridge insertion direction.

FIG. 7 is a detailed diagram showing how dust is removed. The dust removing brush 99 comes into contact with the surface of the objective lens 91 through the opening of the actuator cover 93 opened right above the objective lens 91 supported by the lens holder 92, rotates as described above, and the objective lens 91 is rotated. Dust off dust adhering to the surface.

[0008]

[Problems to be solved by the device]

 However, the above-mentioned conventional technique has some problems as described below.

First, since the dust removing brush 99 only wipes the surface of the objective lens 91, the attached dust can be removed, but the adhered sticky substance cannot be removed.

Secondly, as shown in FIG. 7, the area where the dust removing brush 99 and the surface of the objective lens 91 contact each other is limited to the vicinity of the optical axis of the objective lens 91, and from the optical axis of the objective lens 91. Does not touch remote peripheral areas. Therefore, the stain on the peripheral portion of the objective lens 91 is not removed. Further, since the dust removing brush 99 is composed of a large number of bristles, the dust removing brush 99 and the surface of the objective lens 91 are in contact with each other at many points. Therefore, the contact is not uniform and a certain degree of deviation is unavoidable, so that the removal of dirt on the surface of the objective lens 91 becomes uneven.

Thirdly, since the dust removing brush 99 does not have a property of adsorbing the dust that has been wiped off, the dust that has been brushed off from the surface of the objective lens 91 is a part of the optical drive device 101 other than the objective lens 91. There is a great risk of being spread to. If dust adheres to the dust removing brush 99 before the cleaning of the objective lens 91, the dust is diffused into the optical drive device 101 during the cleaning of the surface of the objective lens 91 to clean the inside of the device. There is also a risk of getting dirty than before.

The present invention has been made in view of the above points, and enlarges the area to be cleaned on the surface of the objective lens 91, increases the types of stains that can be removed, and removes the stains. It is an object of the present invention to provide a lens cleaner for an optical head that is less likely to diffuse into the optical disk device.

[0013]

[Means for Solving the Problems]

 In order to solve the above-mentioned problems, according to the invention of claim 1, in an optical head lens cleaner for removing dirt adhering to the surface of an objective lens of an optical head in an optical disk device, a retractable elastic elastic member is used. A cleaning unit that is made of a material and is uniformly pressed onto the surface of the objective lens, and that rubs the entire surface of the objective lens to remove and adsorb dirt adhering to the surface of the objective lens; Driving means for making a movement necessary for rubbing the entire surface of the lens surface, and crimping for uniformly pressing the cleaning portion onto the surface of the objective lens and transmitting the movement by the driving means to the cleaning portion.・ Provided with communication means.

Further, in the invention according to claim 2, the crimping / transmitting means is composed of a leaf spring having a resonance property, and the driving means resonates with the leaf spring and the cleaning portion connected to the leaf spring. It was configured to exercise.

[0015]

[Action]

 According to the structure of the above-mentioned claim 1, the cleaning portion is uniformly pressure-bonded to the objective lens by the pressure-bonding / transmitting means. Then, the entire surface of the objective lens is rubbed by the movement of the driving means transmitted through the pressure-bonding / transmitting means, and the friction removes the dirt adhering to the surface of the objective lens. The removed dirt is adsorbed by the cleaning unit due to its adsorptivity.

Further, according to the structure of the above-mentioned claim 2, the leaf spring constituting the crimping / transmitting means and the cleaning portion connected to the leaf spring resonate due to the movement of the driving means. Due to the resonance, the cleaning section rubs the entire surface of the objective lens, and the friction removes the dirt adhering to the surface of the objective lens. The removed part is adsorbed by the cleaning part due to its adsorptivity.

[0017]

【Example】

 FIG. 1 is a perspective view of a first embodiment according to the present invention. 6, those parts which are the same as those corresponding parts in FIGS. 6 and 7 are designated by the same reference numerals, and a description thereof will be omitted. In the figure, 1 is a pad made of a stretchable elastic material having a suction property, 2 is a pad / leaf spring connecting member, 3 is a leaf spring having resonance, 15 is a leaf spring / coil connecting member, Reference numeral 14 is a coil, 12 is a center yoke, 11 is a side yoke, and 13 is a magnet. Further, reference numeral 10 denotes a movable portion composed of the coil 14, the leaf spring / coil connecting member 15, the leaf spring 3, the pad / leaf spring connecting member 2, and the pad 1. 2 is a detailed diagram showing how the cleaning unit of the present invention removes dirt, but the reference numerals are the same as those in FIG. 1 and FIG.

In FIG. 1, the pad 1 includes the above-mentioned cleaning portion, the pad / leaf spring connecting member 2, the leaf panel 3, the leaf spring / coil connecting member 15, the coil 14, the center yoke 12, the side yoke 11, and the magnet. 13 respectively constitute the above-mentioned crimping / transmitting means.

In FIG. 1, the lower surface of the side yoke 11 is fixed to the bottom surface of the housing 90. The center yoke 12 to which the magnet 13 is adhered penetrates the hollow portion of the coil 14 wound in a rectangular tube shape, and both ends thereof are fixed to both ends of the side yoke 11. The coil 14 slides according to the shape of the center yoke 12, and together with the magnet 13 constitutes a closed magnetic circuit.

One end surface of the leaf spring / coil connecting member 15 is adhered to the side surface of the coil 14. Since the leaf spring / coil connecting member 15 is provided with a round hole in the vertical direction, and a guide shaft (not shown) fixed to the bottom surface of the housing 90 penetrates through the round hole, the leaf spring The coil connecting member 15 can only rotate with respect to the guide shaft. One end of the leaf spring 3 is fixed to the other end surface of the leaf spring / coil connecting member 15. At the other end of the leaf spring 3, a pad / leaf spring connecting member 2 to which the pad 1 is bonded is detachably fixed. The round hole of the leaf spring / coil connecting member 15 is provided at the center of gravity of the movable portion 10.

When using the lens cleaner of this embodiment, the lens cleaner cartridge 102 is inserted into the optical drive device 101 as shown in FIG. 6 as in the conventional case. Then, as shown in FIG. 2, the pad 1 made of an elastic material comes into contact with the surface of the objective lens 91 through the opening of the actuator cover 93 opened right above the objective lens 91 supported by the lens holder 92. Further, the pad / leaf spring connecting member 2 presses the pad 2 from above in FIG. 2 to cause elastic deformation, and uniformly press the surface of the objective lens 91.

In FIG. 1, when a voltage is applied to both ends of the coil 14, the movable part 10 obtains a rotating force centered on the guide shaft due to an electromagnetic force due to an interaction with the closed magnetic circuit. At this time, if the spring constant of the leaf spring 3 is k and the total mass of the working system composed of the pad / leaf spring connecting member 2 and the pad 1 is m, the resonance frequency f of this working system is f = It can be expressed as (1 / 2π) × √ (k / m) (1). Therefore, if an alternating voltage of frequency f of the formula (1) is supplied to the coil 14, the above operating system resonates, and the pad 1 remains perpendicular to the optical axis of the object lens 91 while being pressed to the objective lens 91. It reciprocates in different directions (the directions of the arrows shown in Figures 1 and 2). By this reciprocating motion, almost the entire surface of the objective lens 91 is rubbed by the pad 1, and the dirt adhering to the surface of the objective lens 91 is effectively removed as compared with the conventional case. Then, the removed dirt is adsorbed on the pad 1 as it is.

FIG. 3 is a perspective view of a second embodiment according to the present invention. In the figure, the same parts as those of the conventional example and the first embodiment are designated by the same reference numerals, and the description thereof will be omitted. In the figure, reference numeral 23 is a leaf spring / bimorph piezoelectric element connecting member, 22 is a bimorph piezoelectric element, and 21 is a fixing member. Further, reference numeral 20 denotes a movable portion including a pad 1, a pad / leaf spring connecting member 2, a leaf spring 3, a leaf spring / bimorph piezoelectric element 23 and a bimorph piezoelectric element 22. In addition, FIG. 4 is a detailed diagram showing the state of motion when an AC voltage is applied to the bimorph piezoelectric element in the second embodiment. Since the reference numerals given in the figure are the same as those in FIG. 3, description thereof will be omitted.

In FIG. 3, one end of the bimorph piezoelectric element 22 is fixed to the housing 90 by a fixing member 21. The other end of the bimorph piezoelectric element 22 is connected to the leaf spring 3 via a leaf spring / bimorph piezoelectric element connecting member 23. At the other end of the leaf spring 3, a pad / leaf spring connecting member 2 to which the pad 1 is adhered is detachably fixed.

In FIG. 4, when an AC voltage is applied to both electrodes of the bimorph piezoelectric element 22, the bimorph piezoelectric element 22 having one end fixed is deformed in the direction indicated by the arrow, and the free end is indicated by the dotted line in the figure. It will be displaced like Therefore, in FIG. 3, if an AC voltage having the resonance frequency according to the above formula (1) is applied to both electrodes of the bimorph piezoelectric element 22, an operating system composed of the leaf spring 3, the pad / leaf spring connecting member 2, and the pad 1 is obtained. Resonate, and the pad 1 reciprocates as in the first embodiment. Then, the pad 1 effectively removes and adsorbs the dirt adhering to the surface of the objective lens 91 as in the first embodiment.

Although two embodiments have been described here, the cleaning section and the crimping / transmitting means are not limited to these examples. For example, with respect to the pressure-bonding / transmitting means, a method of reciprocating the pressure-bonded cleaning portion in the disc insertion direction, or rotating it around the optical axis of the objective lens can be considered. Further, the cleaning effect is further enhanced by repeatedly changing the pressure for pressing and supplying a cleaning liquid to the cleaning section. In addition, the cleaning effect can be further enhanced by processing the cleaning section such that the side surface that contacts the objective lens is aligned with the curved surface of the objective lens and that appropriate irregularities are formed.

[0027]

[Effect of the device]

 As described above, according to the first aspect of the present invention, the cleaning section is uniformly pressed against the object lens by the pressing / transmitting means, so that the dirt adhering to the surface of the objective lens can be removed evenly. Further, since the entire surface of the object lens surface is rubbed by the movement of the driving means transmitted through the pressure-bonding / transmitting means, it is possible to effectively remove the sticky substances and the like adhered to the surface of the objective lens. The peripheral area away from the optical axis can also be cleaned. The removed dirt is adsorbed by the cleaning section due to its adsorptivity, so there is almost no risk that the dirt removed from the surface of the objective lens will be diffused to a portion other than the objective lens. In addition, there is almost no risk that dirt adhering to the cleaning section before cleaning will diffuse into the optical drive device during cleaning.

According to the second aspect of the present invention, the leaf spring and the cleaning portion connected to the leaf spring which constitute the crimping / transmitting means resonate due to the movement of the driving means. Makes a reciprocating motion with large amplitude. Therefore, as compared with the case where the resonance effect is not used, the effect of claim 1 can be obtained with less drive energy.

[Brief description of drawings]

FIG. 1 is a perspective view of a first embodiment according to the present invention.

FIG. 2 is a detailed view showing how the cleaning unit of the present invention removes dirt.

FIG. 3 is a perspective view of a second embodiment according to the present invention.

FIG. 4 is a detailed diagram showing a state of motion when an AC voltage is applied to the bimorph piezoelectric element according to the second embodiment of the present invention.

FIG. 5 is a perspective view of a conventional example.

FIG. 6 is a view showing a usage pattern of a lens cleaner for an optical head in the related art and the present invention.

FIG. 7 is a detailed diagram showing how dirt is removed by a conventional cleaning unit.

[Explanation of symbols]

1 Pads made of an elastic material having adsorptivity for fine particles of dirt 2 Pad / leaf spring connecting member 3 Leaf spring 11 Side yoke 12 Center yoke 13 Magnet 14 Coil 15 Leaf spring / coil connecting member 21 Fixing member 22 Bimorph piezoelectric element 23 Plate Spring / bimorph piezoelectric element connecting member 90 Housing 91 Objective lens 92 Lens holder 93 Actuator cover 94 Switch pressing rod 95 Switch 96 Battery 97 Motor 98 Connecting rod 99 Brush 100 Optical head 101 Optical drive device 102 Lens cleaner cartridge

Claims (2)

[Scope of utility model registration request] 1. A lens cleaner for an optical head for removing dirt adhering to the surface of an objective lens of an optical head in an optical disk device, wherein the lens cleaner is made of a stretchable elastic material having an adsorptive property and is uniformly pressed onto the surface of the objective lens. And a cleaning unit that rubs the entire surface of the objective lens to remove and adsorb the dirt adhering to the surface of the objective lens, and the cleaning unit performs the movement necessary to rub the entire surface of the objective lens. A lens cleaner for an optical head, comprising: a driving unit; and a crimping / transmitting unit that uniformly crimps the cleaning unit onto the surface of the objective lens and transmits the motion of the driving unit to the cleaning unit. . 2. The crimping / transmitting means is composed of a leaf spring having a resonance property, and the driving means is configured to make a motion to resonate with the leaf spring and the cleaning portion connected to the leaf spring. The lens cleaner for an optical head according to claim 1, wherein: