JPS6360468B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an optical reading pick-up transfer device in an optical reading device for scanning a record carrier having a laser beam reflection type information body.

This optical reading device is a device that scans a recording track on the recording surface of a record carrier with a laser beam.
In particular, a device for scanning video and/or audio recording tracks on a reflective recording surface of a rotating video or audio disk by means of a laser beam, comprising an optical reading pick-up (hereinafter referred to as pick-up) and an optical reading pick-up transport device (hereinafter referred to as transport). It consists of the following:

A pick-up is a precision optical instrument consisting of a combination of means for focusing a laser beam onto a disk as a read spot of desired size and for photoelectrically converting the reflected read beam.

The transfer device supports the pick-up and reliably transfers it in the radial direction of the disk.It keeps the angle between the laser beam emitted from the pick-up and the disk at right angles, and operates lightly and smoothly with little backlash or vibration. mechanism is required.

BACKGROUND OF THE INVENTION Conventional transfer devices have a structure that uses radial ball bearings to obtain linear motion, as shown in FIGS. 1 and 2.

In FIG. 1 and FIG. 2, 1 is a disk, 2 is a pickup, and 3 is a laser beam, which is projected from the pickup 2, reflected by the disk 1, and returned to the pickup 2 again. 4 is a carriage that supports the pick-up 2 and is reciprocated in the radial direction of the disk 1; 5A and 5B are slide shafts that function as guide rails; 6A to 6D are radial ball bearings that support the carriage 4 on the slide shaft 5; 7A~7
D is a stud that supports the radial ball bearings 6A to 6D, 8 is a holder that supports the stud 7B, 9 is a bolt that fixes the holder 8, 10 is an arm that fixes the stud 7D, 11 is a pin that rotationally supports the arm 10, 12 is a spring that engages with the arm 10 and presses the radial ball bearing 6D against the slide shaft 5B;
Reference numeral 13 denotes a spring hook that is set on the carriage 4 and hangs one end of the spring 12.

Next, the operation of the conventional device will be explained. 5A,
Reference numeral 5B indicates a slide shaft which forms a reference position of the transfer device and serves as a guide rail, and both ends thereof are fixed to a chassis (not shown). The members 7 to 13 attached to the carriage 4 move together with the carriage 4,
It forms the moving part of the transfer device. The two studs 7A installed on the carriage 4 are arranged symmetrically at a certain angle, support the radial ball bearing 6A, and rest on the slide shaft 5A. Two radial ball bearings 6a eliminate play in the left and right direction. Next, the radial ball bearing 6 supported by the stud 7B installed in the holder 8
B is brought into pressure contact with the slide shaft 5A, and the bolt 9 is tightened to fix the holder 8 to the carriage 4. By doing this, vertical play can be eliminated. Here, since it is difficult to hold the entire movable part with one slide shaft, another slide shaft 5B is arranged. A stud 13 is installed on the carriage 4 to support the radial ball bearing 6C and bring it into contact with the slide shaft 5B. Next, a radial ball bearing 6D is placed on the opposite side of the radial ball bearing 6C, and the slide shaft 5B is held between both sides. The radial ball bearing 6D is supported by a stud 7D, and the stud 7D is fixed to an arm 10 by caulking or the like, and the arm 10 is rotatably supported by a pin 11 set in the carriage 4. This arm 1
The arm 10 is pulled by engaging the spring 12 with the spring 12 and hooking the other end to the spring catch 13 set on the carriage 4, thereby pressing the radial ball bearing 6D against the slide shaft 5B. With the above structure, the radial ball bearings that come into pressure contact with the slide shaft 5A can be mounted on the left and right sides. The radial ball bearing that eliminates vertical play and presses against the slide shaft 5B is the carriage 4.
is prevented from tilting in the direction of arrow 14, and the entire movable part moves linearly on slide shafts 5A and 5B, which are guide rails.

In addition, by using high-precision mechanical parts such as radial ball bearings, there is less friction, smooth movement is achieved, and mechanical accuracy is easily achieved.

In the above configuration, the conventional one requires five radial ball bearings alone, and each radial ball bearing requires a stud. Further, since the radial ball bearing on the slide shaft 5b side is attached to an arm and pulled by a spring, the number of parts is extremely large, and the device is also large and requires a lot of space. Moreover, many of the components include expensive radial ball bearings, which increases the cost of the entire device.

Further, since the radial ball bearing 6A that is in pressure contact with the slide shaft 5A side is arranged symmetrically at a certain angle, the shape becomes complicated and the workability is naturally deteriorated. Furthermore, since the radial ball bearing 6D, which is pressed against the slide shaft 5B by the spring 12, is held only by the spring force, there is a drawback that it is susceptible to disturbance vibration.

This invention was made in order to eliminate the drawbacks of the conventional device as described above, and it does not use radial ball bearings or pressure springs.
Using linear balls and guide grooves, the number of parts is small.
The purpose of the present invention is to provide a transfer device that has a simple shape and a structure that is resistant to external vibrations.

An embodiment of the present invention will be described below with reference to the drawings. In FIGS. 3, 4, and 5, reference numeral 15 serves as a reference for the positional relationship between the transfer device and the disk 1, and also serves as a guide rail. Reference numeral 16 holds the pick-up 2 and moves it in the radial direction of the disk 1. The carriage 17 is a cylindrical linear ball bearing, and the outer cylinder 18 is the carriage 1.
It is inserted into a hole 19 formed in 6 and fixed, and the inner periphery is formed so as to be in rolling contact with the slide shaft 15 by a ball 20. Carriage 16
A V-groove 21 with an angle of 90° is formed on the lower surface to serve as a guide rail 22. A guide rail 24 having a V-groove 23 at a position facing the guide rail 22 is fixed to the chassis 25 with, for example, screws. A steel ball 26 is fitted between the grooves. Further, a retainer 27 that rotatably holds the steel balls 26 is arranged between the guide rails 22 and 24.

In the above configuration, the linear ball bearing 17 has a cylindrical structure as shown in FIG. In order to circulate the balls 20, elliptical guide grooves 28 are formed at four to six locations on the circumference at equal intervals, and a large number of balls 20 in these guide grooves 28 are formed.
maintains simultaneous contact between the inner circumferential surface of the outer cylinder 18 and the slide shaft 15 in the straight portion of the guide groove 28, and rolls in the axial direction while receiving a load, thereby providing stable linear motion guidance. The mechanical precision of the linear ball bearing 17 is comparable to that of a radial ball bearing. When assembling into the transfer device, hole 1 is inserted into the carriage 16 as shown in FIG.
9 and insert the linear ball bearing 1 here.
Just insert two pieces of 7 on both sides. The fit between the linear ball bearing 17 and the hole 19 uses a loose fit or a tight fit. By doing this, the carriage 16 is mounted on a linear ball bearing 17 with respect to the slide shaft 15 which is the position reference of the transfer device.
Since it is supported through a simple structure, positional accuracy can be achieved. Moreover, since the linear motion guide is a rolling guide using balls, it is light and can operate smoothly like a radial ball bearing. In addition, the slide shaft 15, the ball 20,
Since the linear ball bearing outer cylinder 18 and the carriage hole 19 are in contact with each other, no horizontal or vertical play occurs.

Next, regarding the inclination in the direction of arrow 14, a V groove 21 having an angle of 90° is formed on the lower surface of the carriage 16 to serve as a guide rail 22, and this guide rail 2
A guide rail 24 having a V-groove 23 of the same shape at a position facing 2 is attached to a retainer 27 via a plurality of steel balls 26 rotatably supported.

The steel ball 26 is inserted between the guide rails 22 and 24, and is held between the surfaces of the V-grooves 21 and 23 in a press-contact state. Guide rail 2
When installing 4, the carriage 16 is attached to the slide shaft 1.
After being supported by 5, it is fixed along this line, so installation is very easy. The above structure prevents the carriage 16 from tilting in the direction of the arrow 14, and the carriage 16 reliably absorbs looseness, allowing accurate transfer operation. Additionally, it is resistant to external vibrations because it does not require pressure contact using a spring as in the conventional method.

Moreover, since all movable parts are in rolling contact, the transfer operation is light and smooth.

In this embodiment, the steel balls 26 are fitted between the V-grooves 21 and 23, but the steel balls 26 are not limited to balls, and of course may be roller-shaped rolling elements.

As described above, according to the present invention, a transfer device for an optical reading device has a small number of parts, few expensive parts, and a simple shape, so processing and assembly is easy, and there is no play in the vertical, horizontal, and tilt directions. is absorbed, the entire device is made more compact, which helps save space, and it is also resistant to external vibrations.

[Brief explanation of the drawing]

1 and 2 are block diagrams showing an example of a conventional optical reading pickup transfer device, FIG. 3 is a block diagram showing an embodiment of the present invention, and FIGS. 4 and 5 are block diagrams showing one embodiment of the present invention. It is a perspective view of the main part of an example. In the figure, 1 is a disk, 2 is a pick-up, 3 is a laser beam, 15 is a slide shaft, 1
6 is a carriage, 17 is a linear ball bearing, 18 is a linear ball bearing outer cylinder, 19 is a carriage hole, 20 is a ball, 21 and 23 are V
groove, 22 and 24 are guide rails, 25 is a chassis,
26 is a steel ball, 27 is a retainer, and 28 is an oblong guide groove. Note that the same reference numerals in the figures indicate the same or corresponding parts.

Claims (1)

[Scope of Claims] 1. A device that supports an optical reading pick-up for reading information from a disk-shaped record carrier on which information is recorded concentrically or spirally and reciprocates in the radial direction of the disk-shaped record carrier. The carriage, which is a movable part that holds and moves the optical reading pick-up, is linearly guided by a pair of guide parts, one end of which is formed by a round shaft and a linear ball bearing, and the other end of which is tilted at an angle of about 90 degrees. A set of guide rails each having a V-shaped groove formed in the axial direction.
1. An optical reading pick-up transfer device characterized in that rolling elements held in pressure contact with groove surfaces are rotatably mounted at predetermined intervals. 2. The optical reading pick-up transfer device according to claim 1, wherein the rolling elements are formed of balls or rollers.