JPH0574128A - Cleaning device for encoder - Google Patents

Abstract

PURPOSE:To clean a linear encoder simply, safely and without fail by holding a cleaning means movably so that the fore end of the cleaning means is made to access the encoder in a state wherein a guide member is charged in a charging element. CONSTITUTION:A guide member 4 is charged, instead of an ordinary cartridge, in a cartridge charging element, i.e., a cartridge holder 5, of an information recording-reproducing apparatus and the main body 3A of a cleaning means is rotated. A folded part 303A of a nozzle 303 is put in a state of being close to the vicinity of a linear encoder 206 substantially and an opening 302 is directed toward the linear encoder 206. An air stream is jetted from the nozzle 303 by an air jetting means 301 by such a manual operation as compressing a rubber bag and thereby a place to which dust is possible to stick is cleaned sufficiently.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cleaning device for an encoder in an optical information recording / reproducing device.

[0002]

2. Description of the Related Art Conventionally, in an optical information recording / reproducing apparatus for optically recording and / or reproducing information on a disk-shaped recording medium housed in a cartridge, an optical information recording / reproducing apparatus is arranged inside the apparatus in the radial direction of the recording medium. A position detection sensor is movably provided in order to monitor the current position or speed of the optical head when the head is sought to irradiate a desired track of the recording medium with a beam spot. And a linear encoder extends in the seek direction.

That is, as shown in FIG. 17, the turntable 201 is usually used in the above optical information recording / reproducing apparatus.
Corresponding to the disc-shaped recording medium 1 held by the optical disk, a carriage 202 is arranged so as to be movable in the radial direction, and an optical head including an objective lens 203 on the carriage, and the objective lens 203 in the tracking and focusing directions. An actuator 204 for fine adjustment is mounted on the carriage 202 to move the carriage 202 to the linear motor 2
It is driven by 05. And the carriage 2
The movement amount of 02 is verified by detecting the linear encoder 206 fixed on the base 2 by the position detection sensor 207 provided on the carriage 202 and feeding it back to a control unit (not shown). There is.

[0004]

However, in the above information recording / reproducing apparatus, when the disk-shaped recording medium 1 rotates in the direction of the arrow C, the air flow generated on the surface of the recording medium causes dust in the air to be generated by the linear encoder. 206 (except for the innermost track side where the air flow is blocked by the actuators and sensors) and adheres. In this case, the pitch of the slits formed in the encoder is, for example, about 250 μm, and even a small amount of dust adheres to the detection signal, resulting in a failure in reading the detection signal and causing a count error. Therefore, the dust adhering to the linear encoder 206 needs to be cleaned regularly and often. For this cleaning, the device must be disassembled until the linear encoder is exposed, which is not easy for the user to handle, and even maintenance technicians for regular inspection can
Cleaning work takes time and effort.

[0005]

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and an object of the present invention is to provide an encoder cleaning device which enables a user or a maintenance engineer to easily, safely, and reliably perform cleaning of the encoder. Is.

[0006]

Therefore, according to the present invention,
Corresponding to a position detection sensor for seeking an optical head in the radial direction of the recording medium inside an optical information recording / reproducing apparatus that optically records and / or reproduces information on a disc-shaped recording medium housed in a cartridge. And a guide member that can be inserted into the loading portion of the recording / reproducing apparatus in which the cartridge is loaded, instead of the cartridge, and the guiding member is attached to the loading portion. In the loaded state, the cleaning means is movably held with respect to the guide member so that the tip of the cleaning means can access the linear encoder.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to FIGS.
This will be specifically described. The same components as those shown in the conventional example are designated by the same reference numerals and the description thereof will be omitted.
FIG. 1 shows a cleaning device according to the present invention, in which a cleaning means 3 is provided on a guide member 4 having substantially the same shape as a cartridge for accommodating a disc-shaped recording medium used in a target optical information recording / reproducing device. The cleaning means 3 is provided with a nozzle 303 protruding forward from the front edge of the guide member 4 to the rear portion via the guide member 4, and the air ejection means 301 such as a rubber bag is provided there. Is equipped with.

More specifically, the cleaning means 3 described above.
Is equipped with a cleaning body 3A having a circular tubular shape so as to penetrate the center of the guide member 4, and is equipped with the nozzle 303 which is bent into a substantially L-shape at the tip thereof. Have a large number of openings 302 arranged side by side in the longitudinal direction. The guide member 4
Is composed of a molded product that can be divided into upper and lower parts 401 and 402 (see FIG. 2), and bearing portions 403 and 404 that rotatably hold the cleaning main body 3A.
It is equipped with. A guide groove 403A is formed in the middle of the bearing portion 403, and a rotation restricting cam 305 attached to the cleaning body 3 is arranged therein. The claw portion of the cam 305 abuts the top plate portion and the bottom plate portion of the guide member 4 to regulate the rotation range of the cleaning main body 3A with respect to the bearing portions 403 and 404 (FIG. 2 and FIG. 4). A knob 304 for rotating the cleaning body 3 is provided between the cleaning body 3A and the air ejecting means 301.

Therefore, as shown in FIG. 5, the guide member 4 is loaded into the cartridge loading portion of the information recording / reproducing apparatus, that is, the cartridge holder 5 in place of the normal cartridge. When the cleaning main body 3A is rotated as described above, the folded-back portion 303A of the nozzle 303 is brought into a state of being substantially close to the vicinity of the linear encoder 206, and the opening 302 is directed to the linear encoder 206 (see FIGS. 7 to 9). ). Therefore, the air flow can be jetted from the nozzle 303 by a manual operation such as compressing the rubber bag to sufficiently clean the place where dust may adhere.

11 to 14, the guide member 4 is shown.
On the other hand, another embodiment is shown in which the cleaning body 3A can be moved back and forth. That is, FIG.
1 is a guide groove 40 in the area shown in (a) and (b).
3A and 403B have a cross-sectional shape as shown in FIGS.
Can be rotated in the guide groove 403A, and movement is restricted in the guide groove 403B so that it can move only in the longitudinal direction of the cleaning body 3A. Therefore, the cleaning main body 3A cannot be moved forward with respect to the guide member 4 from the posture shown in FIG. Therefore, first, the knob 304 is operated to move the guide groove 40.
The cam 305 is rotated in the clockwise direction from the position shown in FIG. 12 (a) within 3A and is guided to the other end of the guide groove 403A. In this posture, the tip end opening 302 of the nozzle 303 is directed to the linear encoder 206, and the cam 305 corresponds to the next guide groove 403B. Therefore, from the solid line state of FIG.
It is possible to move to an imaginary line state, and the cleaning main body 3A can be advanced to move the tip end opening 302 in the longitudinal direction of the linear encoder 206 to realize cleaning by jetting air. This state is shown in FIG.

In the above embodiment, the rubber bag is simply adopted as the air injection means, but preferably, the rubber bag is provided with a check valve, and the elasticity of the rubber bag is utilized to
A pump structure for compressing and supplying air can be obtained by repeatedly squeezing it, or other simple air injection means can be adopted.

Further, instead of the nozzle tip portion, a cleaning means provided with a brush at the front edge portion of the guide member 4 is used, for example, in the process of moving the carriage 202 in the seek direction, the surface of the linear encoder is brushed. You may do so. This specific structure is shown in FIGS. 15 and 16. Here, FIG. 11 to FIG.
The structure of the guide grooves 403A and 403B of the embodiment shown in FIG. 4 is adopted, the rubber bag is removed from the base end of the cleaning main body 3A, and instead, the nozzle 303 corresponding to
A brush 306 is provided at the tip.

[0013]

As described above, the present invention provides the above-mentioned recording medium inside an optical information recording / reproducing apparatus for optically recording and / or reproducing information on a disk-shaped recording medium housed in a cartridge. Cleaning means for cleaning the linear encoder provided corresponding to the position detection sensor for seeking the optical head in the radial direction,
And a guide member that can be inserted into the loading portion of the recording / reproducing apparatus in which the cartridge is loaded, in place of the cartridge. When the guide member is loaded in the loading portion, the tip of the cleaning means is Since the cleaning means is movably held with respect to the guide member so as to access the linear encoder, a user or a maintenance engineer can easily, safely and surely clean the encoder.

[Brief description of drawings]

FIG. 1 is a perspective view showing an embodiment of the present invention.

FIG. 2 is an exploded perspective view of the same.

FIG. 3 is a sectional view of a cam portion of the same.

FIG. 4 is an exploded perspective view showing an operation state of the same.

FIG. 5 is a perspective view showing a situation in which the encoder is cleaned by the device of the present invention.

FIG. 6 is a plan view of the same.

FIG. 7 is an end view of the same.

FIG. 8 is an enlarged end view of the same.

FIG. 9 is likewise an enlarged side view of the nozzle.

FIG. 10 is a perspective view showing another embodiment of the present invention.

FIG. 11 is an exploded perspective view of the same.

FIG. 12 is a sectional view showing the guide groove portion in (a) and (b).

FIG. 13 is an exploded perspective view showing an operation state of the same.

FIG. 14 is a perspective view showing a situation in which the encoder is cleaned by the device of the present invention.

FIG. 15 is an exploded perspective view showing still another embodiment of the present invention.

FIG. 16 is an exploded perspective view showing an operation state of the same.

FIG. 17 is a perspective view of an optical information recording / reproducing apparatus for explaining a conventional example.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Disc-shaped recording medium 2 Base 202 Carriage 206 Linear encoder 207 Sensor 3 Cleaning means 3A Cleaning body 301 Air injection means 302 Jet outlet 303 Nozzle 304 Pick 305 Cam 306 Brush 4 Guide member 401, 402 part 403, 404 Bearing part 403A, 403B guide groove

Claims (2)

[Claims] 1. A seek for seeking an optical head in a radial direction of the recording medium inside an optical information recording / reproducing apparatus for optically recording and / or reproducing information on a disk-shaped recording medium housed in a cartridge. The guide member includes cleaning means for cleaning a linear encoder provided corresponding to the position detection sensor, and a guide member that can be inserted into the loading portion of the recording / reproducing apparatus in which the cartridge is loaded, instead of the cartridge. An encoder characterized in that the cleaning means is movably held with respect to the guide member so that the tip of the cleaning means can access the linear encoder when the cleaning means is loaded in the loading section. Cleaning device. 2. The encoder according to claim 1, wherein the cleaning means is composed of a nozzle that opens at a front portion of the guide member, and an air injection means that communicates with the nozzle. Cleaning device.