JPH0610552Y2 - Optical card read / write device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial application] The present invention relates to an optical card reading / writing device provided with a drive mechanism for freely moving a carrier.

[Prior Art] As a conventional optical card reading / writing device, a pair of guide shafts are installed inside a main body, and an optical pickup or a carrier holding an optical card is configured to move along the guide shafts. What you have done is known. The read / write device is provided with a drive mechanism for movably supporting the carrier along the guide shaft. As shown in FIG. 6, for example, this drive mechanism is composed of a drive motor 23, a pulley 24 fitted to the shaft of the drive motor 23, and a steel belt 25 stretched between the pulley 24 and the carrier. Has been done. One end of the steel belt 25 is the carrier 2
6 is fixed to one of a pair of belt mounting portions 26a provided along the transport direction, and a midway portion is wound around the outer circumference of the pulley 24 and is fixed at a predetermined position on the outer circumference of the pulley 24. Also steel belt 25
The other end is attached to the other belt attachment portion 26b of the carrier 26 via a U-shaped tension spring 27 for applying a tension to the steel belt 25.
Under the control of the drive motor 23, the steel belt 25 is pulled by the pulley 24, and the carrier 26 moves.

[Problems to be Solved by the Invention] In such an optical card reading / writing apparatus, since the track interval of the optical card is small, for example, 2 μ, the positioning accuracy of the optical card and the optical pickup is extremely high. Required.

However, when the belt 25 is stretched by the tension spring 27 as described above, the tension spring 27 has a predetermined U-shape as shown in FIG. 7 due to a slight dimensional error of each member constituting the device. If the belt 25 is assembled in a bent state, the belt 25 is inclined by this bending amount. However, when the belt 25 is tilted in this way, a part of the tension of the belt 25 is absorbed by the carrier 2.
When the carrier 6 is moved, it acts on the carrier 26 as a component force in a direction perpendicular to the moving direction, and this force causes an eccentric frictional force in the sliding contact portion between the guide shaft and the carrier 26, and There has been a problem that smooth movement is hindered and proper positioning operation cannot be performed.

Therefore, in order to solve the above-mentioned problems, the present invention provides an optical card reading / writing device provided with a tension spring that can always stretch the belt horizontally and stably move the carrier. Has an aim.

[Means for Solving Problems] In order to solve the above-mentioned problems, the optical card reading / writing apparatus of the present invention has a drive motor, a pulley fitted to the shaft of the drive motor, an optical pickup or A carrier having an attachment part of a belt on which an optical card is placed and which can be moved to a read / write position, and both ends are attached to a belt attachment part of the carrier, and an intermediate part is wound around an outer periphery of the pulley. A reading / writing device for an optical card, comprising: a belt fixed at a predetermined position on the outer circumference of a pulley, and moving a carrier under the control of a drive motor, the device being provided between at least one end of the belt and a belt mounting portion of the carrier. The feature is that a symmetrical tension spring is provided in the direction of its action line.

[Operation] Due to the symmetrical tension spring, the belt is always maintained in a constant tension direction regardless of tension fluctuations.
The carrier is smoothly moved along the guide shaft and positioned at a predetermined position.

[Embodiment] FIG. 1 is a partially omitted plan view of an optical card reading / writing apparatus according to an embodiment of the present invention.

A pair of guide shafts 2a and 2b are installed in parallel with each other in a main body 1 of the optical card reading / writing device in a direction orthogonal to an inserting direction of the optical card (direction of arrow A in FIG. 1). There is. A pickup carrier 4 carrying an optical pickup 3 is supported on these guide shafts 2a and 2b. The pickup carrier 4 is provided with a pair of mounting portions 4a and 4b for mounting a belt 6 to be described later on both ends in the transport direction. The pickup carrier 4 is provided with a bearing mechanism (not shown) for slidably supporting it along the guide shafts 2a and 2b.

The drive mechanism of the pickup carrier 4 is the second
As shown in the figure, it is composed of a drive motor 5, a pulley 13 fitted to the shaft of the drive motor 5, and a belt 6 installed between the pulley 13 and the pickup carrier 4.

The belt 6 is, for example, a steel belt and has a mounting hole 6 in the center.
It has a and has a substantially fork shape that is bifurcated from the middle. One end of the belt 6 is fixed to the one belt mounting portion 4a. The intermediate portion of the belt 6 is wound around the outer circumference of the pulley 13 of the drive motor 5, and is fixed to one point on the outer circumference of the pulley with a screw or the like through the mounting hole 6a. Belt 6
The other end of the pickup carrier 4 is provided with a tension spring 15 that is a combination of a U-shape and an inverted U-shape in line symmetry with respect to the transport direction, and is fixed to a belt mounting portion protruding from the other end 4b of the pickup carrier 4. It is set up.

Further, in the main body, another pair of guide shafts 7a and 7b which are orthogonal to the guide shafts 2a and 2b and which extend along the inserting direction of the optical card 8 are provided.
Are laid in parallel. A card case carrier 9 for holding an optical card 8 is supported on these guide shafts 7a and 7b. The card case carrier 9 is provided with one mounting portion 9a for mounting a belt 11 which will be described later. And this card case carrier 9
A bearing mechanism configured by a combination of a plurality of receiving members 14 and pressing members 16 is provided and slidably supported along the guide shafts 7a and 7b. The bearing mechanism of the pickup carrier 4 described above is the same bearing mechanism as the card case carrier 9. Also, this card case carrier 9
The drive mechanism of the drive motor 10 is, as shown in FIG.
A pulley 20 fitted to the shaft of the drive motor 10, an idler pulley 19 fitted to the shaft of the main body 1, these pulleys 19 and 20, and a mounting portion 9
The belts 11 and 17 stretched between a and a.

The belt 17 has one end fixed to the belt mounting portion 9a of the card case carrier 9 and the other end fixed to the pulley 20.
It is fixed to the outer circumference of. The belt 11 has one end fixed to the outer periphery of the pulley 20 in parallel with the belt 17, an intermediate portion wound around the outer periphery of the idler pulley 19, and the other end connected to the mounting portion 9a side via the tension spring 18. Has been done.

The tension spring 18 has the same shape as the tension spring 15 described above, and is a combination of a U-shaped portion 18a and an inverted U-shaped portion 18b which are line-symmetrical with respect to the transport direction.

In the read / write device having the above-described structure, the card case carrier 9 and the pickup carrier 4 are controlled to move so as to intersect with each other, and the optical card 8 inserted through the optical card insertion opening 12 provided on one side of the main body 1. Is held by the card case carrier 9 and moved to a predetermined reading / writing position,
The optical pickup 3 reads and writes the optical card 8 based on the movement of the pickup carrier 4.

In addition, the tension springs 15 and 1 of the respective drive mechanisms of the pickup carrier 4 and the card case carrier 9 as described above.
As shown in FIG. 4, 8 are U-shaped portions 15a,
The joint portion between 18a and the inverted U-shaped portions 15b and 18b is the direction of the line of action of the belts 6, 11 and 17, that is, the guide shafts 2a and 2b.
It is arranged in parallel along the axial direction of b, 7a, 7b. Therefore, even when the tension of the belts 6, 11 and 17 fluctuates during assembly of the device, the U-shaped portions 15a and 18a and the inverted U-shaped portion 15
Due to the interaction of b and 18b, the tension springs 15 and 1
8 is deformed only in the direction of the action line (phantom line in FIG. 4). As a result, the belts 6, 11 and 17 are always maintained in a stretched state parallel to the guide shafts 2a, 2b, 7a and 7b, and proper tension is applied to the carriers 4 and 9 along their moving directions. By giving each carrier 4,
9 can be moved smoothly.

Further, in the above-described embodiment, the tension springs 15 and 18 are line-symmetrical to the U-shaped portions 15a and 18a and the inverted U-shaped portions 15b and 18b.
Although the combination of the above is described, the tension spring 30 may be a combination in which the U-shaped portion 30a and the inverted U-shaped portion 30b are continuous in the direction of the acting line of tension as shown in FIG.

Also in this case, the tension spring 30 is displaced only in the guide axis direction with respect to the belt tension fluctuation, and the stable movement of the carriers 4 and 9 can be secured.

[Effects of the Invention] As described above, in the optical card reading / writing apparatus according to the present invention, the tension spring for stretching the belt for moving the carrier is provided for the fluctuation of the belt tension due to the assembly error of the apparatus. Since the carrier is always deformed only in the moving direction, tension in the wrong direction is not applied to the moving carrier, stable movement of the carrier can be secured, and positioning accuracy can be improved. .

[Brief description of drawings]

FIG. 1 is a partially omitted plan view of an optical card reading / writing apparatus according to an embodiment of the present invention, and FIG. 2 shows a pickup carrier driving apparatus of the optical card reading / writing apparatus according to the embodiment. FIG. 3 is a perspective view with parts omitted, FIG. 3 is a partially omitted perspective view showing a drive device of a card case carrier of an optical card reading / writing device according to the same embodiment, and FIG. 4 is a side view showing a tension spring according to the embodiment. FIG. 5 is a side view showing a tension spring of a read / write device according to another embodiment of the present invention, FIG. 6 is a side view showing a drive device of a conventional optical card read / write device, and FIG. FIG. 7 is an enlarged side view showing the action of the tension spring of the drive device shown in FIG. 6. 3 ... Optical pickup, 4, 9 ... Carrier, 4a, 4
b, 9a ... Attachment part, 5, 10 ... Drive motor, 6,
11,17 ... Belt, 8 ... Optical card, 13,20 ...
… Pulley, 15,18,30 …… Tension spring, 1
5a, 18a, 30a ... U section, 15b, 18b, 30
b ... Inverse U-shaped part.

Claims (3)

[Scope of utility model registration request] 1. A drive motor (5, 10), a pulley (13, 20) fitted to a shaft of the drive motor (5, 10), and an optical pickup (3) or an optical card (8). At the same time, the carrier (4, 9) movably supported to the read / write position and having the belt mounting portions (4a, 4b, 9a), and the belt mounting portion (4) of both ends of the carrier (4, 9).
a, 4b, 9a), and a midway portion is wound around the outer circumference of the pulley (13, 20).
(3, 20) Belts (6, 1) fixed in place on the outer circumference
1, 17), and an optical card reading / writing device for moving the carrier (4, 9) under the control of the drive motors (5, 10), the belt (6, 11, 17) At least one end of the carrier and the belt mounting portions (4a, 4b, 9) of the carriers (4, 9).
A reading / writing device for an optical card, wherein a tension spring (15, 18, 30) having a symmetrical shape is provided between a) in the direction of its line of action. 2. The tension springs (15, 18) are U-shaped (15a, 18) in line symmetry with respect to the direction of action of the springs.
An optical card reading / writing apparatus according to claim 1, characterized in that it comprises a combination of a) and an inverted U-shaped portion (15b, 18b). 3. The utility model registration claim 1 wherein the tension spring 30 is a combination of a U-shaped portion (30a) and an inverted U-shaped portion (30b) which are continuous in the direction of action of the spring. Optical card read / write device as described.