JPH0258756A - Disk opening and closing device - Google Patents

Abstract

PURPOSE:To reduce the cost and to improve the working property of the assembling work of the title device and at the same time, to prevent occurrence of abnormal sounds and deformation by using a torsion coil spring as a spring device and providing a front and intermediate fulcra by bending one arm of the spring at an obtuse angle on the middle and providing inflection point of elastic constant. CONSTITUTION:When an operation button 8 is pressed, a sliding piece 9 retreats and a lock is unlocked. In addition, since the repulsing force of a torsion coil spring 12 predominates the attracting force of the magnet 6 of a disk lid 4, a disk holding device 5 is separated from a turntable 2. When the torsion coil spring 12 opens, its fulcrum moves from an intermediate fulcrum 12b to a front fulcrum 12a and the length of the acting arm of the spring 12 changes from the one shown by the dimension line (a) to the one shown by the other dimension line (b). Therefore, the elastic constant of the spring 12 changes as the fulcrum moves and the repulsing force of the spring 12 is reduced to almost half. As a result, the disk lid 4 is slowly opened. Thus occurrence of abnormal sounds and deformation can be prevented and in addition, the working property of the assembling work can be improved and the cost can be reduced.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a disc lid opening/closing device used in a comparator 91-disc player equipped with a disc holding device.

(Prior Art) In recent years, Konbaku 1-disc players have been equipped with a disc holding device on the disc lid that utilizes the attraction force of a magnet, and the disc is biased in the opening direction using a spring device to ensure smooth opening and closing. A lid opening/closing device is used.

This type of conventional disk lid opening/closing device will be explained with reference to FIG.

This figure is a side cross-sectional view showing a conventional disk lid opening/closing device, in which a turntable 2 on which a disk is mounted is rotated by an electric motor built in the I-rubber units 1 to 3.

The disc lid 4 can be freely opened and closed around an integrally formed support shaft 4a.

The disc holding device 5 is held with a degree of freedom on the disc lid 4, and utilizes the attraction force between a magnet 6 built in the center and an iron piece (not shown) built into the turntable 2. The disc 1 mounted on the turntable 2 is held down by the gripping disc 5a on the lower surface, and the operation button 8 provided on the main body 7 of the disc player is pressed in the locking direction by a spring (not shown). Lock and release the disk 9: 4 through the plate 9 which has been applied.

The two large and small torsion coil springs 10 and 11 that always bias the disk M4 in the opening direction are supported by the U-holding shafts 7++ and 7b integrally formed with the main body 7 shown in 1-. The large torsion recoil 1:1 is used to reduce the weight of the disk lid 4, and the small torsion coil spring 11 releases the attraction force of the magnet 6.

Please explain the operation of the 5 switchgear configured as shown in I- below. )1° When the disc lid 4 is closed, the disc 1 is in close contact with the tongue table 2 due to the attraction force of the magnet 6 of the disc holding device 5. To take out disc 1, press operation button 8, press sliding piece 0 to 11!1, and press disc lid 4.
unlock the door. The torsion recoil springs 10 and 11 are configured to have a repulsive force that counteracts the load due to the weight of the disc lid 4, and a repulsive force that counteracts the attraction force of the magnet 6 by -1, respectively. coil spring 11
After releasing the attractive force of the magnet 6, the recoil spring l
Open the disc cover 4.

(Problem to be solved by the invention) However, in the configuration as described in (G), the number of twisting coils 10 and 11 is large, making the assembly work complicated.
Therefore, there was a problem that it was expensive. In addition, as a countermeasure for this, if the torsion coil is set to -1, the repulsion force will be large, and the attraction force of the magnet will be released, and the opening speed of the disk 'M, 4 will be faster from the time of the car, and at the end of the opening. There were problems such as abnormal noises and deformation.

The present invention solves the problem described in J-, and provides L1L with a disk lid opening/closing device that is inexpensive, has good assembly workability, and is free from abnormal noise and deformation.

(Means for solving the problem) 1-ll! In order to solve this problem, the present invention has a torsion coil spring that biases the disc at 96°C in the opening direction, and has a repulsive force that is twice the attraction force of the magnet when the disc lid starts to be opened. - An elastic constant inflection point is provided in the torsion coil spring of wood so that the repulsive force is weaker than the adsorption force described in 1-1 when released. At the beginning of opening the disk lid, which uses the constant inflection point as the support point, it acts with a repulsive force that is -1 - around the attraction force of the magnet, and then changes to a weak repulsive force as the support point changes to the tip of the arm. This acts to gently open the disc lid. .

(Example) An example of the present invention will be described with reference to FIGS. 1 to 4.

1 and 2 are a perspective view and a side sectional view of a disc lid opening/closing device according to the present invention.

The disc lid opening/closing device according to the present invention shown in FIGS. 1 and 2 differs from the conventional example shown in FIG. Instead of the torsion coil springs 10 and ]1, one torsion coil spring 12 is used, which has an intermediate fulcrum 12b bent at an obtuse angle in the middle of an arm having one end fulcrum 12a. 9. The two support shafts 7a and 7b integrally formed on the main body 7 are only the integral support shaft 7a. Since the rest is the same as the conventional example, the same components are given the same reference numerals and their explanations will be omitted.

The operation of the disk lid opening/closing device constructed in this manner will be explained with reference to FIGS. 3 and 4.

When the operation button 8 is pressed, the sliding piece 9 is retracted and the lock is released, and the disk holding device 5 is moved to the turntable 2 because the repulsive force of the torsion coil spring 12 exceeds the attraction force of the magnet 6. move away from

When the torsion recoil spring 12 opens, the fulcrum becomes the intermediate fulcrum +2b
Then, it moves to the tip fulcrum 12a, and the state shown in FIG. 4 is reached. The length of the working arm of the torsion recoil spring 12 changes from the dimension line a shown in FIG. 3 to the dimension line 2 shown in FIG. 4. Therefore, the elastic constant changes at the same time as the fulcrum is moved, and the repulsive force is reduced by almost half, so that the disc lid 4 is opened gently, and no abnormal noise or deformation occurs at the end of the opening.

(Effects of the Invention) As explained above, according to the present invention, it is a single torsion coil spring, so that no abnormal noise or deformation occurs when the disc lid is opened, and the number of parts is small, and the assembly work is easy and inexpensive. A disk lid opening/closing device of 1° to 1° is obtained.

[Brief explanation of the drawing]

1 and 2 are perspective views and side sectional views of a disc lid opening/closing device according to the present invention; FIGS. 3 and 4 are elastic portions of the spring device). FIG. 5 is a side sectional view of a main part of the I+ operation, and FIG. 5 is a side sectional view of a conventional disk lid opening/closing device. ] - Disc, 2 - Turntable, 3 Traverse unit i ~, 4 - Disc lid, 4a, 7a
, 7b・Support shaft, 5 Tisfu holding device, 6・
Magnet, 7 Main body, 8・Operation button, 9・Sliding piece,
10.11.12 Torsion coil spring, 12a tip fulcrum, 12b intermediate fulcrum. Patent applicant Matsushita Electric Industrial Co., Ltd.

Claims (1)

[Claims] A disk drive unit having a turntable driven by an electric motor, a disk lid that can be opened and closed and has a disk holding device with a built-in magnet for mounting the disk on the turntable, and the disk lid is attached in the opening direction. In a disk lid opening/closing device consisting of a spring device for biasing, a torsion coil spring is used as the spring device, one arm of which is bent at an obtuse angle in the middle, and a tip fulcrum and an intermediate fulcrum are provided.
A disc lid opening/closing device characterized by having an inflection point of an elastic constant.