JPH0740417B2 - Shutter structure of disk cartridge - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention relates to, for example, a writable disc.
The present invention relates to a shutter structure for opening and closing an optical head insertion hole in a disc cartridge using a disc capable of both recording (writing) and reproducing (reading) such as an optical disc or a magneto-optical disc referred to as c).

[Outline of Invention]

According to the present invention, the shutter is urged from the forward movement position to the backward movement position by the elastic force of the tension coil spring,
In the shutter structure of the disk cartridge, which is positioned at the forward position by the initial stress applied to the tension coil spring in advance, a pair of springs that locks both ends of the tension coil spring under the free length of the spring. A stop, a first moving member having one of the pair of spring stops, a spring locking member having the other of the spring stops and moved to a position for applying an initial stress to the tension coil spring, A second moving member that holds the spring locking member at the initial stress position, and the first moving member or the second moving member moves as the shutter moves to the forward movement position. Since the elastic force of the tension coil spring is increased, the tension coil spring can be mounted automatically.

[Conventional technology]

As is well known, a writable disc, which is a recording medium such as an optical disc or a magneto-optical disc, easily causes an error in recording and reproducing when fingerprints (oil), dust, and the like are attached. The optical head insertion hole that is housed inside and that is opened in the cartridge is opened and closed by a shutter. In addition, if the shutter may open even during transportation or when not in use due to vibration, dust may easily enter the cartridge from the optical head insertion light and adhere to the disc. The optical head insertion light must always be reliably positioned and the optical head insertion light must be always reliably closed.

Therefore, conventionally, in the shutter structure of this kind of disc cartridge, a tension coil spring having an initial stress is attached between the shutter and the cartridge to bias the shutter from the forward movement position to the backward movement position to act as a stopper. It is configured so that the shutter is not easily opened due to vibration or the like by pressing with a predetermined force.

[Problems to be solved by the invention]

By the way, in this type of conventional disk cartridge shutter structure, both ends of the tension coil spring are attached to a pair of spring stoppers provided on the shutter and the cartridge, respectively, but the spring is pre-tensioned to give an initial stress to the tension coil spring. It was very difficult to automate the installation work of the tension coil spring that locks both ends of the spring with a pair of spring stoppers in this state. For this reason, conventionally, the work of attaching the tension coil spring is performed manually by an operator, which is inefficient and costly.

[Means for solving problems]

The present invention includes a shutter that is biased by the elastic force of the tension coil spring from the forward movement position that opens the opening to the backward movement position that closes the opening. In a shutter structure of a disk cartridge configured to be positioned by an initial stress applied in advance to the first moving member having a first spring stopper capable of locking one end of the tension coil spring, and the tension coil spring A second spring stopper capable of locking the end is provided, and after the tension coil spring in a free length is locked between the first and second spring stoppers, the initial stress is applied to the tension coil spring. A spring locking member that is moved to the initial stress applying position, and a second moving member that holds the spring locking member at the initial stress applying position. It is accompanied with the movement of the shutter to the position and movement of the first moving member or the second moving member, which is constituted of the shutter structure of the disk cartridge as the elastic force of the tension coil spring is increased.

〔Example〕

An embodiment to which a shutter structure of a disk cartridge according to the present invention is applied will be described below with reference to the drawings.

First, the outline of the disk cartridge will be described with reference to FIGS. 6 and 7, and a writable disk (Writable Disk) which is a recording medium such as an optical disk or a magneto-optical disk.
c) 1 is rotatably housed in a cartridge 4 composed of upper and lower halves 2 and 3 having a substantially rectangular shape formed of a synthetic resin such as polycarbonate resin.
A circular turntable insertion hole 5 is provided in the central part of the optical disc 3, and an optical head insertion hole 6 which is a recording and reproduction head insertion hole is provided on one side thereof from the central part to the outer peripheral part.
The shutter 7 is made of a metal plate such as a stainless plate and has a substantially cross-section. The pair of upper and lower optical head insertion holes are opened and closed by the shutter 7. The upper and lower halves 2 and 3 are assembled from above and below by screwing a plurality of screws 8 around their peripheral portions. Further, the shutter 7 is attached to a shutter attachment member 9 configured to be movable along one side surface 4a of the cartridge 4 by screwing with a plurality of screws 10.

Then, the shutter 7 is moved between the backward movement position shown by the solid line in FIG. 7 and the two forward movement positions shown by the one-dot chain line and the two-dot chain line on both sides thereof in the arrow a, b direction and the arrow a '. The shutter 7 is selectively reciprocable in the b'direction, and the shutter 7 is biased by a tension coil spring, which will be described later, to a center position P in the return position from both the directions of the arrows b and b '. It is positioned so that both optical head insertion holes 6 are always reliably closed.

Next, the mounting structure of the tension coil spring 12 and the shutter 7 will be described with reference to FIGS.

First, the spring used for the shutter structure of this disc cartridge is a tension coil spring 12, and there are 1 at both ends.
A pair of hooks 12a and 12b are integrally provided. Also, to attach the tension coil spring 12 and the shutter 7,
Shutter mounting members 9 each made of synthetic resin,
The spring locking member 13, the first moving member 14 and the second moving member 15 are used, and the first and second spring stoppers 16a are formed by vertical pins or the like for the first moving member 14 and the spring locking member 13. , 16b are integrally molded, and both hooks of the tension coil spring 12 are
12a and 12b are locked. Further, the second moving member 15 is integrally formed with an engaging portion 17 such as a movable claw having elasticity, and further, the spring engaging member 13 is elastically engaged (an action of utilizing elasticity is utilized). The engaged portion 18 that is engaged with the engaging portion 17 is integrally formed.

Next, as shown in FIGS. 4 and 5, a pair of upper and lower guide ribs 19a, 19b and 20a, 20b are formed in parallel on one side surface 4a of the cartridge 4 and on the inner surfaces of the upper and lower halves 2, 3. None of them are integrally molded. The guide rib 19a
And 20a are butted against each other from above and below, and guide grooves 21 and 22 are formed between the pair of upper and lower guide ribs 19a and 19b and 20a and 20b, respectively. The shutter mounting member 9 has a generally prismatic shape, and guide grooves 23 and 24 provided along both upper and lower surfaces thereof are fitted into both upper and lower guide ribs 19b and 20b as shown in FIG. Guide rib 19
It is slidable along b and 20b. As shown in FIGS. 1 and 5, a rectangular protrusion 25 is integrally formed in the central portion of the lower surface of the rear portion of the shutter mounting member 9, and the protrusion 25 has a lower guide groove as shown in FIG. Slide inside 22. Further, as shown in FIGS. 1 and 4, a stopper 26 composed of a quadrangular protrusion is integrally formed in the central portion of the lower guide groove 22 on the side of the guide rib 20a, and this stopper 26 is shown in FIG. It is located at the center position P. And as shown in FIG. 2A, the protrusion 25 and the stopper
The width t in the left-right direction with respect to 26 is formed to be almost equal.

Next, as shown in FIG. 1, the spring locking member 13 is formed by integrally molding the spring stopper 16b and the engaged portion 18 and a vertical projection 29 on the upper portion of a substantially rectangular horizontal plate 28. A notch 30 is formed at one corner of the horizontal plate 28.

The second moving member 15 is formed by integrally molding an elastic arm 32 and a fixed arm 33 at right angles to each other at the lower portions of both ends of a frame plate 31 having a substantially L shape. The engaging portion 17 is integrally provided at the tip of the elastic arm 32, and the protrusion 33a is integrally provided at the lower portion of the tip of the fixed arm 33. Also the first
The moving member 14 is formed by integrally forming the spring stopper 16a on the horizontal plate 35 of the substantially L-shaped horizontal plate 35 and the vertical plate 36.

Next, as shown in FIG. 2A, FIG. 4 and FIG. 5, both the upper and lower guide grooves 21, with the spring locking member 13 and the first moving member 14 distributed to the left and right sides of the projection 25 and the stopper 26, respectively. It is slidable along the inside of 22. The second moving member
Reference numeral 15 is a spring locking member that connects the elastic arm 32 and the fixed arm 33.
It is configured to be slidable along the upper and lower guide grooves 21 and 22 in a state of being superposed on the horizontal plate 28 of 13, and the protrusion of the fixed arm 33.
33a is fitted in the notch 30 from above.

It should be noted that the tool insertion hole 37 (6th position) is provided at a position just above the upper guide groove 21 shown in FIG.
FIG. 7, FIG. 7) are provided.

Next, the order of attaching the tension coil spring 12 and the shutter 7 will be described.

First, as shown in FIG. 2A, FIG. 3A and FIG. 5, the spring locking member 13 and the first moving member 14 are fitted into the guide grooves 22 of the lower half 3 from above from the left and right sides of the stopper 26, respectively. And second
The moving member (15) is fitted from above into the guide groove (22) from above the spring locking member (13). The stoppers 26 are provided on the left and right facing surfaces 14a and 15a of the first moving member 14 and the second moving member 15, respectively.
The left and right side surfaces 26a of the spring locking member 13 are brought into contact with the fixed arm 33 of the second moving member 15, and the tip end 18a of the engaged portion 18 of the spring engaging member 13 is brought into contact with the fixed arm 33.

Then, this time a pair of spring stop 16a, 16b spacing 1 _1,
However, both hooks 12 under the free length of the tension coil spring 12
Since the spacing is the same as the spacing between a and 12b, the tension coil spring 12 remains free and the pair of spring stoppers 16a and 1b
Can be installed on 6b. Therefore, the tension coil spring
12 can be easily attached to the pair of spring stoppers 16a and 16b by an automatic machine.

Next, as shown in FIGS. 2A, 3A, and 4, the shutter mounting member 9 is fitted onto the guide rib 20b of the lower half 3 from above by means of the lower guide groove 24, and the protrusion 25 thereof is first
The shutter mounting member 9 is inserted between the facing surfaces 14a, 15a of the moving member 14 and the second moving member 15, and the rear edge side of the shutter mounting member 9 is located above the elastic arm 32 of the second moving member 15 and the tip of the fixed arm 33. The upper part and the upper part of the first moving member 14 on the front edge side of the horizontal plate 35 are overlapped.

Next, as shown in FIGS. 3A, 4, and 6, the lower half 3
The upper half 2 is fitted onto the upper part of the cartridge 2 from above, and these are screwed from above by a plurality of screws 8 to fix the cartridge 4
Assemble. At this time, as shown in the fourth cormorant, the guide rib 19b of the upper half 2 is connected to the guide groove 2 of the shutter mounting member 9.
The upper edge portions of the vertical plate 36 of the first moving member 14 and the frame plate 31 of the second moving member 15 are fitted into the guide groove 21 of the upper half 2 while being fitted into the upper half 2 from above.

In the above assembling stage, the protrusion 29 of the spring locking member 13 and the one end 31a of the frame plate 31 of the second moving member 15 are positioned directly under the tool insertion hole 37 of the upper half 2.

Therefore, as shown in Fig. 3A, a pair of left and right gripping tools of an automatic machine.
39a and 39b are inserted into the tool insertion hole 37 from above, and the projection 29 and the one end 31a are gripped from the left and right sides by these gripping tools 39a and 39b. Then, at this time, since the second moving member 15 is in contact with the stopper 26 by the facing surface 15a thereof, only the spring locking member 13 is moved in the arrow a direction as shown in FIGS. 2B and 3B. The one spring stopper 16b is moved in the direction of arrow a while pulling the tension coil spring 12.
That is, the spring locking member 13 is moved toward the second moving member 15 by the arrow a.
Is moved in the opposite direction against the tension coil spring 12, and the engaged portion 18 bends the engaging portion 17 in the direction of arrow c against the elasticity of the elastic arm 32, as shown by the chain double-dashed line in FIG. 2A. On the other hand, the engaged portion 18 relatively rides over the engaging portion 17. When the spring locking member 13 is moved to a predetermined position in the direction of the arrow a with respect to the second moving member 15, the elastic arm 32 as shown in FIG. 2B.
Elastically returns to the original posture, the engaging portion 17 and the engaged portion 18 are engaged, and the spring locking member 13 and the second moving member 15 are integrated.

Then, as a result of the above, as shown in FIGS. 2B and 3B, 1
A pair of spring stop 16a, spacing 16b is fixed is enlarged to a large distance l ₂ ,, initial stress is applied to the tension coil spring 12. Finally, as shown in FIG. 4 and FIG. 7, a shutter 7 having a generally cross-sectional shape is provided on the outside of the upper and lower halves 2 and 3 from one side surface 4a of the cartridge 4 by a pair of upper and lower horizontal plates 7a. Insert horizontally and a pair of upper and lower horizontal plates
A series of assembling is completed by screwing a plurality of screws 10 to the side surface 9a of the shutter mounting member 9 at the side surface plate 7b portion that vertically connects one ends of the 7a. At this time, as shown in FIG. 4 and FIG.
The free ends 7a 'of the pair of horizontal plates 7a are inserted into a pair of upper and lower guide grooves 40 provided along the upper and lower surfaces of the upper and lower halves 2 and 3, respectively.

Then, the tension coil spring 12 attached in the above order.
Since the initial stress is applied to the
As shown in Fig. 3 and Fig. 3B, 1
The pair of spring stoppers 16a and 16b are urged to move in the directions of arrows b and b ', and the spring locking member 13 and the second moving member 15 are integrally formed with the arrow b.
The first moving member 14 is moved and biased in the direction of the arrow b '. Then, the projection 25 of the shutter mounting member 9 is sandwiched from the left and right sides between the facing surfaces 15a and 14a of the second moving member 15 and the first moving member 14, and both facing surfaces 15a and 14a of the stopper 26 of the lower half 3 are formed. Left and right sides
When the shutter 7 is pressed by the predetermined force (initial stress applied to the tension coil spring 12) to the 26a,
It is accurately and surely moved back and positioned at the center position P of the returning position shown by the solid line in the figure. As a result, the shutter 7 is not easily opened in the direction of arrow a or a'in FIG. 7 due to vibration or the like.

The shutter 7 shown in this embodiment has a so-called double-opening structure which can open the lid from the backward moving position shown by the solid line in FIG. 7 in either direction of arrow a or a '. When the shutter 7 is opened in the direction of the arrow a, the projection 25 of the shutter mounting member 9 is moved to the second position with the first moving member 14 stopped by the stopper 26 as shown in FIGS. 2C and 3C. The opposing surface 15a of the moving member 15 is pushed in the direction of the arrow a, and the spring locking member is inserted through the engaging portion 17 and the engaged portion 18.
13 is pushed together in the direction of arrow a, and one spring stop 16a
As a result, the tension coil spring 12 is pulled in the direction of arrow a, and the tension coil spring 12 is charged with the returning force of the shutter 7 in the direction of arrow b in FIG. On the contrary, when the shutter 7 is opened in the direction of arrow a'in FIG. 7, the spring locking member 13 and the second moving member 15 are used.
In the state where and are stopped by the stopper 26, the first moving member 14 is moved by the projection 25 of the shutter mounting member 9 as shown in FIG. 2C and FIG.
3C, the tension coil spring 12 is pushed by the other spring stopper 16b in the arrow a'direction in FIG. 3C, and the tension coil spring 12 is pulled in the arrow a'direction by the seventh shutter 7 in the arrow b'direction. The return force will be charged.

By the way, according to the attachment structure of the tension coil spring 12 and the shutter 7 described above, after the tension coil spring 12 is previously attached in the cartridge 4, the tension coil spring 12 is attached.
Initial stress can be applied to 12 from outside the cartridge 4. Moreover, after that, the shutter 7 can be screwed from the outside of the cartridge 4 to the shutter mounting member 9 and the shutter 7 can be accurately and surely positioned in the backward movement position by the initial stress applied to the tension coil spring 12. Therefore, the hooks 12a and 12b at both ends of the tension coil spring 12 are first directly locked to the shutter 7 and the cartridge 4, respectively, and then an initial stress is applied to the tension coil spring 12, as is generally done. The tension coil spring 12 and the shutter 7 need not be carried out at all, such as attaching the shutter 7 to the cartridge 4 while pulling the tension coil spring 12.
The installation work of can be performed very easily and highly efficiently.

Although one embodiment of the present invention has been described above, the present invention is not limited to the embodiment, and various effective modifications can be made based on the technical idea of the present invention.

For example, in the embodiment, the shutter 7 has a double-opening structure. However, if the shutter 7 has a single-opening structure, for example, the shutter 7 itself is a second moving member referred to in the present invention.
The spring locking member 13 may be directly locked to the shutter 7.

Further, if the shutter 7 has a single-opening structure, the spring stopper 16b of the first moving member 14 may be integrally formed with the lower half 3 and the like.

According to the shutter structure shown in the embodiment, the shutter mounting member 9 may be omitted and the projection 25 may be integrally provided on the shutter 7.

Further, the shutter mounting member of the present invention, a pair of spring stoppers,
The shapes and structures of the first and second moving members, the spring locking portion, the engaging portion, and the engaged portion are not limited to those shown in the embodiment, but can be changed to various shapes and structures.

〔The invention's effect〕

According to the present invention, when both ends of the tension coil spring are first locked to the pair of spring stoppers, the distance between the pair of spring stoppers is made to coincide with the free length of the tension coil spring, and the tension coil spring is pulled in this state. After locking the coil spring to the spring stopper,
By fixing the pair of spring stoppers with an interval therebetween, the tension coil spring is given an initial stress, so that the tension coil spring can be easily and easily attached to the tension coil spring. It is possible to improve the efficiency and cost of the assembly work of the disc cartridge and the like.

BRIEF DESCRIPTION OF THE DRAWINGS The drawings show an embodiment in which the present invention is applied to a shutter opening / closing device of a disk cartridge, and FIG. 1 is an exploded perspective view of essential parts, FIGS. 2A to 2C. Is a plan view of the main part,
Fig. 3A is a view of Fig. 2A IIIA-III line A, Fig. 3B is a view of Fig. 2B.
III B-III B line arrow view, FIG. 3C is FIG. 2C III C-III C line arrow view, FIG. 4 is 3B IV-IV line arrow view, FIG. 5 and FIG. 6 are FIG. 7 is a partially exploded perspective view, and FIG. 7 is a plan view of the entire disc cartridge. In the reference numerals used in the drawings, 1 ... disk 2 ... upper half 3 ... lower half 4 ... cartridge 6 ... optical head insertion hole (opening) 7 ... shutter 9 ... shutter mounting member 12 ... pulling Coil spring 12a …… Hook of tension coil spring 12b …… Hook of tension coil spring 13 …… Spring locking member 14 …… First moving member 15 …… Second moving member 16a …… Spring stop 16b …… Spring stop 17 ...... Engagement part 18 …… Engagement part 26 …… It is a stopper.

Claims (1)

[Claims] 1. A shutter, which is biased by an elastic force of a tension coil spring from a forward movement position for opening the opening to a backward movement position for closing the opening, the shutter being at the backward movement position. In a shutter structure of a disk cartridge configured to be positioned by an initial stress applied to a spring in advance, a first moving member having a first spring stopper capable of locking one end of the tension coil spring, and a tension coil spring A second spring stopper that can lock the other end is provided, and after the tension coil spring that is under free length is locked between the first and second spring stoppers, the initial stress is applied to the tension coil spring. A spring locking member that is moved to the initial stress applying position, and a second moving member that holds the spring locking member at the initial stress applying position, Serial is accompanied with the movement of the shutter to forward position the first
A shutter structure for a disk cartridge, wherein the moving member or the second moving member moves to increase the elastic force of the tension coil spring.